Block brake and its cam

FIELD: transport.

SUBSTANCE: invention relates to cam-driven block brakes and their components. Cam (38) has one or several ledges (62, 64) with multiple sections (62A-C, 64A-C) that feature various profiles in axial cross section. Varying the cam profile allows producing the cam with the extreme outer ends or apexes of the ledges with length exceeding that of common cams, the mechanical strength being preserved. Increased travel of brake shoes allows using brake shoe lining of increased thickness.

EFFECT: longer life of brake shoe linings.

45 cl, 11 dwg

 

Prerequisites to the creation of inventions

The scope of the invention

The present invention in General relates to brakes, in particular driven by the Cam drum brake, which allows the use of brake pads with increased thickness compared to conventional brakes.

Prior art

Conventional drum brake includes a brake drum which rotates together with a wheel or wheels near one end of the axis. The brake drum defines a radially inner surface of the braking. The brake spider is at the axis and supports the anchor finger (anchor), which is in the axial direction from the cross. A pair of brake shoes are installed with the possibility of rotation relative to the anchor at the first end. Each brake Shoe includes a roller or Cam followers element near the second end. Generally S-shaped Cam is in engagement with the rollers in the brake shoes, whereby rotation of the Cam moves the brake shoes between positions of engagement and disengagement with the braking surface of the brake drum.

The brake shoes in a conventional drum brakes have brake pads that create a frictional engagement with the braking surface of the brake drum after tripping is ormosa. Brake pads wear out and trip. As a result, the brake pads should be periodically replaced. Replacement brake pads leads to significant costs associated with them the actual repair and maintenance works, as well as loss of use time (idle time) of the vehicle.

The present invention is to minimize or eliminate these drawbacks brakes and related components.

Summary of invention

In accordance with this invention proposes a brake and various advanced components brakes. In particular, in accordance with the present invention serves Cam, which allows you to have an increased movement of the brake shoes and to use thicker brake pads, however, while providing sufficient force actuation. As a result, the proposed Cam and the brake will reduce operating costs and reduce simple car associated with conventional brakes.

The Cam in accordance with the present invention is intended for use in a brake having first and second brake shoes and the first and second Cam followers items that engages with the specified Cam and with the relevant listed first or the WTO is a diversified brake shoes, moreover, the rotation of the Cam in opposite directions of rotation about the axis of rotation causes movement of the first and second brake shoes between positions of engagement and disengagement with the braking surface. The Cam may have a first protrusion and a second protrusion. At least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile. In accordance with the first aspect of the present invention the first and second areas can work together to form a mainly uniform working surface designed for engagement with one Cam following element from the first and second Cam tracking elements when the first and second brake shoes move from the position of the brake in the engaged position, and may optionally form a heterogeneous surface opposite the working surface. In accordance with another aspect of the present invention the first and second areas can work together to form a work surface designed for engagement with one Cam following element from the first and second Cam tracking elements when the first and second brake shoes move from the position of the brake in the engaged position, and heterogeneous surface is rnost, opposite the above-mentioned working surface, with the second area, forming a running radially inside edge, which forms a section of a heterogeneous surface. In accordance with another aspect of the present invention the first and second sections may form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the surface of the braking. Pockets can go from narrowing of the Cam to the top of one protrusion, and the second section forms an edge going at least through one portion of the pocket.

Brake in accordance with the present invention may have a brake spider having a Central hole intended to receive the pass-through axis, and the anchor coming from the brake spider. The brake may further have first and second brake shoes. Each of the first and second brake shoes may be the first jumper installed with the possibility of rotation on the anchor at its first end, the brake plate is supported by means of a first jumper, and a brake pad located on the brake plate. The brake may further have a first Cam followers element located at the second end of the first lane the sliver of the first brake Shoe, and second Cam followers element located at the second end of the first jumper of the second brake Shoe. The brake further comprises a Cam which is engaged with the first and second jaw tracking elements, and the rotation of the Cam in opposite directions of rotation about the axis of rotation causes the first and second brake shoes make a movement between positions of engagement and disengagement with the braking surface. The Cam includes a first protrusion and a second protrusion. Each of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile. In accordance with the first aspect of the present invention the first and second areas can work together to form a mainly uniform working surface designed to engage with one of the first and second Cam tracking elements when the first and second brake shoes move from the position of the brake in the engaged position, and can further define a non-uniform surface opposite the working surface. In accordance with another aspect of the present invention the first and second areas can work together to form a work surface designed for geared whom I'm one of the first and second Cam spy items when the first and second brake shoes move from the position of the brake in the engaged position, and the uneven surface opposite to the above-mentioned working surface, the second section forms a running radially inside edge, which forms a section of a heterogeneous surface. In accordance with another aspect of the present invention the first and second sections may form a pocket configured to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the surface of the braking. Pockets can go from narrowing of the Cam to the top of one protrusion, and the second section forms an edge going at least through one portion of the pocket.

Brake in accordance with the present invention may alternatively contain a brake drum defining a braking surface, and first and second brake shoes installed with the possibility of rotation about their first ends of the inside of the brake drum. The brake may further comprise a first Cam followers element which engages with the first brake Shoe, close to the second end of the first brake Shoe and a second Cam followers the item in zatepleni the second brake Shoe, near the second end of the second brake Shoe. The brake may further comprise a Cam which engages with the first and second jaw tracking elements and having an axis of rotation, and the rotation of the Cam in opposite directions of rotation moves the first and second brake shoes in position of engagement and disengagement with the braking surface. In accordance with the first aspect of the present invention the difference between the diameter of the circle formed by the rotation of the Cam about the axis of rotation, minus the diameter of the circle formed by the rotation of the narrowing of the Cam relative to the axis of rotation is at least about 21% of the diameter formed by the braking surface of the brake drum. In accordance with another aspect of the present invention the diameter of the circle formed by the rotation of the Cam about the axis of rotation is at least about 26.5% of the diameter formed by the braking surface of the brake drum. In accordance with another aspect of the present invention the diameter of the circle formed by the rotation of the Cam about the axis of rotation, at least about 5 times larger than the diameter of the circle formed by the rotation of the narrowing of the Cam relative to the axis of rotation.

In accordance with another aspect of this is the first invention, the brake has improved positional relationship between the Cam and return spring, that allows you to use the Cam of larger size. Brake in accordance with this aspect of the present invention contains the brake drum defining a braking surface. The brake further comprises first and second brake shoes. Each of the first and second brake shoes includes the first and second jumper set to rotate at the first end, the brake plate is supported by means of the first and second ridges, and the brake pad, located on the brake plate. The brake further comprises a first Cam followers element located at the second ends of the first and second jumper of the first brake Shoe and a second Cam followers element located at the second ends of the first and second jumper of the second brake Shoe. The brake further comprises a Cam which engages with the first and second jaw tracking elements and having an axis of rotation, and the rotation of the Cam forms a cylinder, walking on the axis at the axial ends of the Cam. Finally, the brake includes a return spring connecting the first and second brake shoes and located at least partially within the cylinder.

In accordance with another aspect of the present invention provides an improved brake Shoe. Brake Shoe according the present invention includes first and second crosspieces, each of the first and second jumper has first and second end. Brake Shoe further comprises a brake plate is supported by means of the first and second ridges, and the brake pad, located on the brake plate. The first and second jumper shifted from each other between the first and second ends of the first and second jumpers and form an angle with each other near the first end. The first ends of the first and second jumper is configured to receive Cam followers element having first and second working surfaces, which are located outside of the first and second jumper and made with the possibility of engagement with the Cam which selectively forces the Cam servo element out and enters the brake pad into engagement with the braking surface.

Cam and brake in accordance with the present invention have desirable characteristics. Improved design of the Cam and brake allows you to increase the movement of the brake Shoe and allows the use of thicker brake pads. As a result, significantly reduced the operating costs of the vehicle and reduced downtime.

These and other features of the invention will be more apparent from the subsequent detailed description, given as PR is a measure not having restrictive and described with reference to the accompanying drawings.

Brief description of drawings

Figure 1 shows a top view of the brake in accordance with the first variant of the present invention, where one can see the various components of the proposed brakes.

Figure 2 shows a top view of the brake in accordance with the first variant of the present invention, where one can see various other components of the proposed brakes.

Figure 3-4 shows respectively a perspective view and in section, of the Cam in accordance with the first variant of the present invention, which is in engagement with a pair of Cam tracking elements.

Figure 5-6 shows respectively a perspective view and in section, of the Cam in accordance with another variant of the present invention, which is in engagement with a pair of Cam tracking elements.

7-8 shows respectively a perspective view and in section, of the Cam in accordance with another variant of the present invention, which is in engagement with a pair of Cam tracking elements.

Figure 9-10 show respectively a perspective view and in section, of the Cam in accordance with another variant of the present invention, which is in engagement with a pair of Cam tracking elements.

Figure 11 shows a view of perspective with the spatially separated parts of the brake in accordance with another variant of the present invention.

Detailed description of the variants of the invention

We now turn to a consideration of the drawings, in which similar parts have the same reference designators. Figure 1-2 shows the brake 20 in accordance with the first variant of the present invention. The brake 20 is particularly well suited for use on heavy trucks. However, it should be borne in mind that the brake 20 can also be used on a wide variety of vehicles and in other non-automotive applications. The brake 20 may be of the brake drum 22, the brake spider 24, the anchor 26, the brake shoes 28, 30, the retaining spring 32, the Cam followers of the elements 34, 36, the Cam 38 in accordance with the present invention, and the spring 40 to return.

The drum 22 has a surface 42 of the brake and is conventional in design. The drum 22 may be made from conventional metals and metal alloys such as steel. The drum 22 is circular and rotates with the wheel or wheels at one end of the axis.

Brake spider 24, which is used to install the various components of the brake 20 is also conventional in design. The crossbar 24 has a Central opening 44 through which may pass through the axis of the wheels of the car. The cross-piece 24 also supports the anchor 26 on one side of the axis and can optionally have a hole at about iopological side of the axis, through which the Cam shaft (not shown), supporting the Cam 38.

The anchor 26 is used to install the brake shoes 28, 30 can be rotated. The anchor 26 is of conventional construction and is supported by a crossbar 24. The anchor 26 may be a round pin that goes in the axial direction from the yoke 24.

The brake shoes 28, 30 are made with the possibility of selective engagement with the surface 36 of the brake drum 22. Each of the brake shoes 28, 30 may have a pair offset from each other jumpers 46 (only one of which is shown in figure 1), the brake plate 48 and one or more brake pads 50.

Jumper 46 serve to support the brake plate 48. Although in the shown embodiment, it is possible to see only one jumper 46, it should be borne in mind that there is another identical retainer 46, which is displaced along the axis from the jumpers shown and is generally parallel shows the jumper. Jumper 46 are semi-circular in shape and may have a semi-circular recesses 52, 54 at each end. The recess 52 is for receiving the anchor 26 and the jumper 46 is made with a possibility of rotation about the axis of the anchor 26. The recess 54 is used to receive one of the Cam tracking elements 34, 36. Jumper 46 may also have a means, such as holes 56, 58, install retaining Ave is Jin 32 and springs 40 return.

Brake plate 48, which serves to support the brake pads 50 is of conventional design. The plate 48 may be attached to the crosspieces 46 by welding, adhesives or other fastening means. Plate 48 has a semicircular cross section and is mainly perpendicular to the jumper 46.

The brake pads 50 are used for frictional engagement with the braking surface 42 of the drum 22. The brake pads 50 may be made of conventional friction materials. In accordance with the present invention can be used thicker brake pads 50, than conventional brake pads, which lowers operating costs and reduces downtime of the vehicle. In the shown embodiment, each brake Shoe 28, 30 includes two brake pads 50 that are roughly the same size. However, it should be borne in mind that the number, size and shape of the brake pads 50 may be different.

The retaining spring 32 serves to hold the brake shoes 28, 30, and in particular jumper 46 on the anchor 26. Springs are common, and the ends of the springs 32 can be introduced into the jumper 46 through the holes 56.

Cam followers of the elements 34, 36 form a working surface for the Cam 38 with which it interacts in order to move the brake shoes 28, 30 between the provisions of the engagement and disengagement with the braking surface 42 of the drum 22. Cam followers of the elements 34, 36 can enter the notches 54 in the jumper 46 of each of the brake shoes 28, 30. Cam followers of the elements 34, 36 are generally circular in shape. Let us now turn to the consideration of 3-4, which shows the Cam followers of the elements 34, 36, which may have many sections 34A, 34B, 34C and 36A, 36V, 36C, having different diameters and forming different profiles in axial section, the purpose of which will become clear from the further discussion.

The Cam 38 is used to cause movement of the brake shoes 28, 30 between positions of engagement and disengagement with the braking surface 42. The Cam 38 is mounted on the axis of rotation, which may be generally parallel to the axis of rotation of the drum 22 and/or the centerline of the wheel axis. The Cam 38 is supported by the Cam shaft 60 (see figure 3) and can be performed as a single whole with him, and the Cam shaft is driven pneumatically or by any other known means of bringing in traffic.

We now turn to a consideration of figure 3, showing a variant of the Cam 38 in accordance with the present invention. In accordance with the present invention the Cam 38 includes first and second protrusions 62, 64, which may generally be the same. The tabs 62, 64 are in the General form of evolvent and form a generally S-shaped Kalachakra ledge 62, 64 go from narrowing 66 of the Cam 38. Narrowing 66 of the Cam 38 is a radial cross-section of the Cam 38, in which the Cam followers of the elements 34, 36 are closest to each other when the brake is off. Each of the ridges 62, 64 contains many sections A, B, C and 64A, B, C, running in the axial direction from one axial end of the Cam 38 to the opposite axial end of the Cam 38. Lots A, C and 64A, C are located on opposite sides of the plots V, V protrusions 62, 64 and are located at axial ends of the tabs 62, 64. Each plot A, V, S and each section 64A, B, C has a certain profile in axial section. The profile plots A and C may be identical, as well as profiles and sections 64A and S can be identical. Profile plot V is different from the profile plots A and C, while the profile plot V is different from the profile sections 64A and S. Lots A, B, C together form the working surface 68, while the sections 64A, B, S together form the working surface 70, which serve for engagement with the working surfaces of the respective Cam tracking elements 34, 36 to move the brake shoes 28, 30 between positions of engagement and disengagement with the braking surface 42 of the drum 22. Each of the working surfaces 68, 70 may be generally uniform, so DL is any line, going through the surface 68 or 70 parallel to the axis of rotation of the Cam 38, the distance from the axis of rotation (or from the other axis, which is parallel to the axis of rotation to any point on the line will be essentially the same. Lots A, B and C also together form a heterogeneous surface 72 opposite the working surface 68, while the sections 64A, B and C together form a heterogeneous surface 74 opposite the working surface 70. In particular, areas A, C form a pair are displaced from each other in the ribs 76A, B, and sections 64A, S together form a pair are displaced from each other in the ribs 78A, B, so the areas A, C and 64A, S go radially inward substantially further than the relevant areas V, W. Ribs 76A, B, 78A, B can be tapered so that the radial length of each rib 76A, B, 78A, V is maximum near the top of each protrusion 62, 64 and decreases in the direction from the tops of the projections 62, 64 to narrowing 66.

We now turn to a consideration of figure 4, showing the brake shoes 28, 30 in the full trip, with Cam followers of the elements 34, 36 are in the pockets 80, 82 formed with the projections 62, 64. Sections 34A, 34B, 34C and 36A, 36V, 36C spy Cam elements 34, 36 have a configuration that is complementary to the shape of the corresponding non-working surfaces 72, 74 formed by p and use of A, V, S and 64A, B, S respective protrusions 62, 64. Sections 34B, 36V spy Cam elements 34, 36 therefore clamped between the respective ribs 76A, B and 78A, B plots A, C and 64A, S protrusions 62, 64. Sections 34B, 36V spy Cam elements 34, 36 are combined in the axial direction with areas A, C and 64A, S respective protrusions 62, 64 along the axis parallel to the axis of rotation of the Cam 38.

We now turn to a consideration of figure 5-6, showing the Cam 138 in accordance with another variant of the present invention. The Cam 138 includes first and second protrusions 162, 164, which can be basically the same. The tabs 162, 164 are essentially a form of evolvent and form a generally S-shaped Cam. Both of the protrusion 162, 164 are from narrowing 166 of the Cam 138. Narrowing 166 of the Cam 138 is a radial cross-section of the Cam 138, in which the Cam followers elements 134, 136 are closest to each other when the brake is off. Each of the ridges 162, 164 contains many sections A, B, C and A, V, 164 ° C., running in the axial direction from one axial end of the Cam 138 to the opposite axial end of the Cam 138. Lots V, W can be located between the axial ends of the protrusions 162, 164 and can be setentrional between the axial ends of the protrusions 162, 164. Each plot A, V, S and every part A, V, 164 ° C. and eat a specific profile in axial section. The profile plots A and C may be the same, and the profile plots A and 164 ° C. can also be the same. Profile plot V is different from the profile plots A and C, while the profile plot V is different from the profile plots A and 164 ° C.. Lots A, B, C together form a working surface 168, and areas A, B, 164 ° C. together form a working surface 170, and these surfaces are intended to enter into engagement with the working surface of the corresponding Cam followers element 134, 136 to move the brake shoes 28, 30 between positions of engagement and disengagement with the braking surface 42 of the drum 22. Each of the working surfaces 168, 170 may be generally uniform, so that for any line going through the surface 168 or 170 parallel to the axis of rotation of the Cam 138, the distance from the axis of rotation (or from the other axis, which is parallel to the axis of rotation to any point on the line will be essentially the same. Lots A, B and C also together form a heterogeneous surface 172, opposite the working surface 168, while areas A, B and 164 ° C. together form a heterogeneous surface 174, opposite the working surface 170. In particular, the plot V forms a rib 176 and plot V forms a rib 178, so the areas V and V are radially inward of the su is the natural enemy on, than the corresponding plots A, C and A, 164 ° C.. Edges 176, 178 may be tapered so that the radial length of each of the ribs 176, 178 is maximum near the top of each protrusion 162, 164 and decreases in the direction from the peaks of the protrusions 162, 164 to narrow 166.

Let us now turn to the consideration of Fig.6, which shows the brake shoes 28, 30 in the full trip, with Cam followers elements 134, 136 are in the pockets 180, 182 formed with the projections 162, 164. Sections 134A, B, C and A, B, C spy Cam elements 134, 136 have a configuration that is complementary to the shape of the respective outside surfaces 172, 174 are formed with use of A, B, C and A, V, 164 ° C. the respective protrusions 162, 164. Sections 134A, S and plots A, S spy Cam elements 134, 136 so located on each side of the respective edges 176, 178 plots V, 164 protrusions 162, 164. Sections 134A, S and A, S spy Cam elements 134, 136 are also combined in the axial direction with areas V, V respective protrusions 162, 164, along an axis parallel to the axis of rotation of the Cam 138.

Let us now turn to the consideration Fig.7-8, which shows the Cam 238 in accordance with another variant of the present invention. Cam 238 includes first and second tabs 262, 264, which may be in the OS is the same RAM. The tabs 262, 264 are essentially a form of evolvent and form a generally S-shaped Cam. Both tabs 262, 264 are from narrowing 266 Cam 238. Narrowing 266 of the Cam 238 is a radial cross-section of the Cam 238, in which the Cam followers elements 234, 236 are closest to each other when the brake is off. Each protrusion 262, 264 contains many sections A, B, C, 262D, E and A, 264, S, 264D, E, running in the axial direction from one axial end of the Cam 238 to the opposite axial end of the Cam 238. Lots S, S can be located between the axial ends of the tabs 262, 264, and can be setentrional between the axial ends of the tabs 262, 264. Lots A, E and A, E are located respectively on opposite sides of the plots V, S, 262D and 264, S, 264D of the tabs 262, 264 and are located at axial ends of the tabs 262, 264. Each plot A, V, S, 262D, E and every part A, 264, S, 264D, HE has a certain profile in axial section. The profile plots A, C and E may be the same, and the profile plots A, C and E can also be the same. The profile plots V and 262D may be the same, and profiles sections 264 and 264D may also be the same. The profile plots V, 262D are different from the profile plots A, C and E, while the profiles of sections 264, 264D are different from p is of Ofili plots A, S and E. Lots A, B, C, 262D, E together form a working surface 268, and parts A, 264, S, 264D, E together form a working surface 270, and these surfaces are intended to enter into engagement with the working surface of the corresponding Cam followers element 234, 236 to move the brake shoes 28, 30 between positions of engagement and disengagement with the braking surface 42 of the drum 22. Each of the working surfaces 268, 270 may be generally uniform, so that for any line going through the surface 268 or 270 parallel to the axis of rotation of the Cam 238, the distance from the axis of rotation (or from the other axis, which is parallel to the axis of rotation to any point on the line will be essentially the same. Lots A, B, C, 262D and I also together form a heterogeneous surface 272, opposite the working surface 268, while the plots A, 264, S, 264D and E together form a heterogeneous surface 274, opposite the working surface 270. In particular, areas A, C and E form shifted from each other in the ribs A, S, E and parcels A, C and E form shifted from each other in the ribs A, S, E, so the areas A, C, E and A, S, E go radially inward substantially further than the relevant areas V, 262D and 264, 264D. Ribs A, B, C, A, V, S can be tapered, so that RA is territorial, the length of each rib A, V, S, A, V, S is maximum near the top of each protrusion 262, 264 and decreases in the direction from the peaks of the protrusions 262, 264 to narrow 266.

Let us now turn to the consideration pig, showing the brake shoes 28, 30 in the full trip, with Cam followers elements 234, 236 are pockets 280, 282, formed with the projections 262, 264. Sections 234A, B, C, 234D, E and A, V, S, 236D, A spy Cam elements 234, 236 have a configuration that is complementary to the shape of the respective working surfaces 272, 274, educated areas A, B, C, 262D, E and A, 264, S, 264D, A respective tabs 262, 264. Lots V, 234D and plots V, 236D spy Cam elements 234, 236 therefore clamped between the respective ribs A, S, E and A, S, E protrusions 262, 264. Lots V, 234D and V, 236D spy Cam elements 234, 236 are also combined in the axial direction with areas A, C, E and A, S, E respective tabs 262, 264, along an axis parallel to the axis of rotation of the Cam 238.

Let us now turn to the consideration Fig.9-10, which shows the Cam 338 in accordance with another variant of the present invention. Cam 338 includes first and second protrusions 362, 364, which can be basically the same. The tabs 362, 364 are essentially a form of evolvent between their EfE is diversified ends of the protrusions and form a generally S-shaped Cam. Both protrusion 362, 364 are from narrowing of the Cam 366 338. The narrowing of the Cam 366 338 is a radial cross-section of the Cam 338, in which the Cam followers elements 334, 336 are closest to each other when the brake is off. Each protrusion 362, 364 contains many sections A, B, C, 362D, E and A, V, S, 364D, E, running in the axial direction from one axial end of the Cam 338 to the opposite axial end of the Cam 338. Lots A, E and A, E can be located on the opposite axial ends of the protrusions 362, 364. Lots V, S, 362D and V, S, 364D can be located between the axial ends of the Cam 338, and lots S and S can be setentrional between sevime the ends of the protrusions 362, 364. Each plot A, V, S, 362D, E and every part A, B, C, 364D, HE has a certain profile in axial section. The profile plots A and E may be the same, and the profile plots A and E can also be the same. In addition, the profile plots V and 362D may be the same, and the profile plots V and 364D can also be the same. The profile plots A, E are different from the profile plots V, S and 362D, while the profile plots A, E are different from the profile plots V, S and 364D. In addition, the profile plot C is different from the profile plots A, B, 362D and I, at that time what I like the profile plot C is different from the profile plots A, V, 364D and E.

Lots A, B, C, 362D, E together form a working surface 368, which includes surface A, B and parcels A, B, C, 364D, E together form a working surface 370, which includes surface A, V, and these surfaces are intended to enter into engagement with the working surface of the corresponding Cam followers element 334, 336 to move the brake shoes 328, 330 (shown in figure 11) between positions of engagement and disengagement with the braking surface 42 of the drum 22. Lots A, B and A, V working surfaces 368, 370 are generally homogeneous, so that for any line going through the sites A or B surface 368 or areas A or 370 In surface 370 parallel to the axis of rotation of the Cam 338, the distance from the axis of rotation (or from the other axis, which is parallel to the axis of rotation to any point on the line will be essentially the same. Lots A, B, C, 362D and I also together form a heterogeneous surface 372, opposite the working surface 368, while the plots A, B, C, 364D and E together form a heterogeneous surface 374, opposite the working surface 370. In particular, areas A, C, E and plots A, C, E are mainly S-shaped, as areas B, 326D and 364, 364D.

Lots A, E and plots A, E are the two which are similar to the solid plates, formed on each axial end of the Cam 338. Lots A, E together with areas V, S, 362D form a pocket 380, which is designed to receive Cam followers element 334, when the brake shoes 328, 330 are in a position of disengagement from the braking surface 42 of the drum 22. Similarly, plots A, E together with areas V, S, 364D form a pocket 382, which is designed to receive Cam followers element 336, when the brake shoes 328, 330 are in a position of disengagement from the braking surface 42 of the drum 22. Pockets 380, 382 are from narrowing 366 to the heights of the protrusions 362, 364, and the tops of the protrusions 362, 364 contain the most distant point move on the tabs 362, 364 of narrowing 366 witness for Cam elements 334, 336, when the Cam followers elements 334, 336 to move along the working surfaces 368, 370. Lots A, E and plots A, I form a pair of ribs 376A, E and parcels A, I form a pair of ribs A, E. Ribs 376A, E and A, E come across at least one section of the respective pockets 380, 382. Lots A, E and A, E are located outside of any axial end of the Cam tracking elements 334, 336, when the brake shoes 328, 330 are in a position of disengagement from the braking surface 42 of the drum 22. Each of the sites A, E and plots A, E may have a hole 377, art is meant for admission of lubricant in the Cam servo elements 334, 336 when the brake rescaled. Holes 377 combined with jaw tracking elements 334, 336 on an axis parallel to the axis of rotation of the Cam 338, when the brake shoes 328, 330 are in the position of disengagement. Holes 377 can be generally teardrop-shaped, and may not follow the contour of the surfaces 368, 370. However, it should be borne in mind that the size and shape of holes 380 and the number of holes 377 may be different.

Lots S and S form a cropped top for tabs 362, 364 relative to plots V, 362D and V, 364D. As a result, the areas B, V partially offset from the corresponding plot 362D, 364D and form grooves 379, 381. Grooves 379, 381 are designed to receive the brake Shoe 328, 330, when the brake is in the position of disengagement, as discussed in more detail below.

We now turn to a consideration of figure 10, which shows that when the brake shoes 328, 330 is in full release, Cam followers elements 334, 336 are pockets 380, 382 formed with the projections 362, 364. Lots V, S, 334D and V, S, 336D spy Cam elements 334, 336 have a configuration that is complementary to the shape of the respective outside surfaces 372, 374, educated areas V, S, 362D and V, S, 364D respective protrusions 362, 364. Cam followers elements 334, 336 sandwiched between the ACC is dtweedie areas A, E and A, E protrusions 362, 364. Cam followers elements 334, 336 are also combined in the axial direction with areas A, E and A, A respective protrusions 362, 364, along an axis parallel to the axis of rotation of the Cam 338.

Again, let us consider figure 1, which shows that the proposed Cams 38, 138, 238, 338 have more working space than conventional Cams. The peaks of the Cams are longer than conventional Cams, and design of Cams 38, 138, 238, 338 allows you to increase the movement of the brake shoes 28, 30 and to have thicker brake linings 32, without reducing the mechanical strength of the Cam. New design of Cams 38, 138, 238, 338 manifests itself in different based on the size of the dependencies that differ from the dependencies for conventional Cams. In particular, the diameter d1the circle formed by the rotation of the Cam 38, at least approximately 5 times larger than the diameter d2the circle formed by the rotation of narrowing 66 of the Cam 38 about the axis of rotation of the Cam 38. Additionally, the difference between the diameter d1the circle formed by the rotation of the Cam 38, minus the diameter d2the circle formed by the rotation of narrowing 66 of the Cam 38 about the axis of rotation of the Cam 38 is at least about 21%, and mostly at least approximately the 25% of the diameter d 3formed by using the surface 42 of the brake drum 22. The diameter d1the circle formed by the rotation of the Cam 38, also is about 26.5%, and mostly at least about 30% of the diameter formed by using the braking surface 42 of the brake drum 22.

Again, let us consider figure 2, which shows the spring 40 refund intended to offset the brake shoes 28, 30 in a position of disengagement with the braking surface 42. The springs 40 are of conventional design. Conclusions springs are fed through holes 58 jumpers 46 of the brake shoes 28, 30. Although only one spring 40 returns shown in figure 2, connecting the jumper 46 of the brake shoes 28, 30, it should be borne in mind that a similar spring 40 can connect another set of jumpers 46 of the brake shoes 28, 30, which is known in itself. In accordance with another aspect of the present invention, the spring 42 returns are not, as in conventional brakes. In particular, the spring 42 returns are located at least partially within the cylinder formed by the rotation of the Cam 38, and go in the axial direction at the axial ends of the Cam 38. This choice provisions of the springs 42 return facilitates the use of Cams 38, 138, 238, 338 a considerable size, without affecting the functional properties of progi is 40.

Let us now turn to the consideration 11, showing the improved brake shoes 328, 330 in accordance with another aspect of the present invention. Brake shoes 328, 330 contain jumpers 346a plug, V, brake plate 348 and one or more brake pads 350. Brake plate 348 and the brake pads 350 can be mainly the same as the plate 48 and the brake pads 50 and, therefore, additional description of these components is not given.

Jumper 346a plug, V are intended to support the brake plate 348. Jumper 346a plug, W are semicircular in shape and may have a semicircular notches 352, 354 on each end. The recess 352 is intended for reception of the anchor 26, intended to provide a turning movement jumpers 346a plug, W relative to the axis of the anchor 26. The recess 354 is designed to receive one of the Cam tracking elements 334, 336. Jumper 346a plug, U can also have a means, such as holes 356, 358, to support the locking spring 32 and the spring 40 to return. Jumper 346a plug, W are offset from each other between the arcuate, longitudinal ends of the jumper 346a plug, W. At the proximal ends of the jumper 346a plug, V, which are designed to receive the respective Cam tracking elements 334, 336, jumpers are at an angle to each other. Jumper 346a plug, W can additionally come in the ü in engagement with each other in the vicinity of these ends, as shown figure 11. Cam followers elements 334, 336 includes a recess 354 so that the working surface W, 334D or V, 336D Cam followers element 334 or 336 will be located outside jumpers 346a plug, W.

Brake in accordance with the present invention has significant advantages compared to conventional brakes. The proposed Cam lets you increase the displacement (stroke) of the brake shoes in the brake and allows the use of thicker brake pads. As a result, significantly reduces the cost of maintenance and technical repairs and less downtime of the vehicle.

Despite the fact that have been described preferred embodiments of the invention, it is clear that it specialists in this field can be amended and supplemented, which do not extend, however, beyond the scope of the following claims. For example, in the form shown in the drawings, the version used only one notch 40. However, it should be borne in mind that many notches 40 may be located circumferentially around the shaft 12, and section 52 of the nut 16 can be deformed in many points, to increase the resistance to rotation.

1. Cam for use in a brake having first and second brake shoes and the first and second Cam after Jamie elements, located in engagement with the specified Cam and with the corresponding one of the specified first and second brake shoes, and a specified rotation of the Cam in opposite directions of rotation about the axis of rotation makes these first and second brake shoes to move between positions of engagement and disengagement with the braking surface containing the first protrusion and the second protrusion, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile, the second section of the protrusion has a through hole, running in the axial direction.

2. The Cam according to claim 1, in which the hole is aligned in the axial direction with one Cam following element along an axis parallel to the axis of rotation when the first and second brake shoes are in the position of disengagement.

3. The Cam of claim 1, wherein the second section of the protrusion is located outside from the first axial end of the Cam followers of the element.

4. The Cam of claim 1, wherein the first and second profiles are profiles in axial section.

5. The Cam of claim 1, wherein the first site is located at the first point along the specified axis, and the second site is located at the second point along the axis, the well is from the first point.

6. The Cam of claim 1, wherein the first site is located at the first point along the specified axis and goes from narrowing of the Cam to the top of the at least one protrusion, and the second site is located at the second point along the axis, different from the first point, and comes from narrowing to the top.

7. The Cam of claim 1, wherein the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is from the narrowing of the Cam to the top of the ledge, while the second section forms an edge going at least through one portion of the pocket.

8. Cam for use in a brake having first and second brake shoes and the first and second Cam followers, the elements being in engagement with the Cam and with the corresponding one of the first and second brake shoes, whereby rotation of the Cam in opposite directions of rotation about the axis of rotation urges the first and second brake shoes to move between positions of engagement and disengagement with the braking surface containing the first protrusion and the second protrusion, and at least one projection of the first and second protrusions includes first party is to, with the first profile, the second section having a second profile different from the first profile, the third section having a third profile, mostly similar to the first profile, and a fourth section having a fourth profile, the first section of the protrusion is offset from the third section of the ledge, resulting in a groove.

9. The Cam of claim 8, in which the groove is designed to receive a portion of one of the first and second brake shoes.

10. The Cam of claim 8, in which the first and second profiles are profiles in axial section.

11. The Cam of claim 8, in which the first site is located at the first point along the specified axis, and the second site is located at the second point along the specified axis, different from the first point.

12. The Cam of claim 8, in which the first site is located at the first point along the specified axis and goes from narrowing of the Cam to the top of the at least one protrusion, and the second site is located at the second point along the axis, different from the first point, and comes from narrowing to the top.

13. The Cam of claim 8, in which the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is about the narrowing of the Cam to the top of one protrusion, the second section forms an edge going at least through one portion of the pocket.

14. Brake, containing the brake spider having a Central hole intended to receive the pass-through axis;
anchor coming from the brake spider;
the first and second brake shoes, each of which contains the first jumper installed at its first end can be rotated on the anchor;
brake plate supported on the first crosspiece; and a brake pad located on the brake plate;
the first Cam followers element located at the second end of the first jumper of the first brake Shoe;
second Cam followers element located at the second end of the first jumper of the second brake Shoe;
and Cam, which is engaged with the first and second jaw tracking elements, and the rotation of the Cam in opposite directions of rotation about the axis of rotation urges the first and second brake shoes to move between positions of engagement and disengagement with the braking surface, and the Cam includes a first protrusion and a second protrusion, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile, the ex is CNY from the first profile, the second portion of one protrusion has a through hole, running in the axial direction, aligned in the axial direction with one Cam following element along an axis parallel to the axis of rotation when the first and second brake shoes are in the position of disengagement.

15. Brake on 14, in which the hole is aligned in the axial direction with one Cam following element along an axis parallel to the axis of rotation when the first and second brake shoes are in the position of disengagement.

16. Brake on 14, in which the second portion of one projection is located outside from the first axial end of one Cam followers of the element.

17. Brake on 14, in which the first and second profiles are profiles in axial section.

18. Brake on 14, in which the first site is located at the first point along the specified axis, and the second site is located at the second point along the axis, different from the first point.

19. Brake on 14, in which the first site is located at the first point along the specified axis and goes from narrowing of the Cam to the top of the at least one protrusion, and the second site is located at the second point along the axis, different from the first point, and comes from narrowing to the top.

20. Brake on 14, in which the first and second sections form a pocket designed to receive one is blackomega tracking element from the first and second Cam spy items when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is from the narrowing of the Cam to the top of one of the ledge, while the second section forms an edge going at least through one portion of the pocket.

21. Brake, containing the brake spider having a Central hole intended to receive the pass-through axis;
anchor coming from the brake spider;
the first and second brake shoes, each of which contains the first jumper installed at its first end can be rotated on the anchor;
brake plate supported on the first crosspiece; and a brake pad located on the brake plate;
the first Cam followers element located at the second end of the first jumper of the first brake Shoe;
second Cam followers element located at the second end of the first jumper of the second brake Shoe; and
the Cam which is engaged with the first and second jaw tracking elements, and the rotation of the Cam in opposite directions of rotation about the axis of rotation urges the first and second brake shoes to move between positions of engagement and disengagement with the braking surface, and the Cam includes a first protrusion and veravista, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile, the third section having a third profile, mostly similar to the first profile, and a fourth section having a fourth profile, the first portion of one protrusion is offset from the third portion of one projection, resulting in a groove.

22. Brake according to item 21, in which the groove is designed to receive section of the corresponding one of the first and second brake shoes.

23. Brake according to item 21, in which the first and second profiles are profiles in axial section.

24. Brake according to item 21, in which the first site is located at the first point along the specified axis, and the second site is located at the second point along the axis, different from the first point.

25. Brake according to item 21, in which the first site is located at the first point along the specified axis and goes from narrowing of the Cam to the top of the at least one protrusion, and the second site is located at the second point along the axis, different from the first point, and comes from narrowing to the top.

26. Brake according to item 21, in which the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, moreover, the pocket comes from narrowing of the Cam to the top of one of the ledge, while the second section forms an edge going at least through one portion of the pocket.

27. Brake, containing the brake drum, which forms the braking surface;
the first and second brake shoes mounted to rotate on the first ends of the inside of the brake drum;
the first Cam followers element that is engaged with the first brake Shoe near the second end of the first brake Shoe;
second Cam followers element which is in engagement with the second brake Shoe near the second end of the second brake Shoe;
the Cam which is engaged with the first and second jaw tracking elements and has an axis of rotation,
moreover, the rotation of the Cam in opposite directions of rotation about the axis of rotation urges the first and second brake shoes to move between positions of engagement and disengagement with the braking surface, while the difference between the diameter of the circle formed by the rotation of the Cam about the axis of rotation, minus the diameter of the circle formed by the rotation of the narrowing of the Cam relative to the axis of rotation is at least about 21% of the diameter formed by the surface of the brake the brake is on the drum.

28. Brake according to item 27, in which the difference is at least about 25% of the diameter formed by the braking surface of the brake drum.

29. Brake according to item 27, in which the Cam includes a first protrusion and a second protrusion, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile, the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is from the narrowing of the Cam to the top of one of the ledge, while the second section forms a the edge, reaching at least one portion of the pocket.

30. Brake according to item 27, in which the difference is at least about 24% of the diameter formed by the braking surface of the brake drum.

31. Brake, containing the brake drum, which forms the braking surface;
the first and second brake shoes mounted to rotate on the first ends of the inside of the brake drum;
the first Cam followers element that is engaged with the first brake Shoe near its second end;br/> second Cam followers element which is in engagement with the second brake Shoe near its second end;
the Cam which is engaged with the first and second jaw tracking elements and has an axis of rotation, and the rotation of the Cam in opposite directions of rotation moves the first and second brake shoes in position of engagement and disengagement with the braking surface, the diameter of the circle formed by the rotation of the Cam about the axis of rotation is at least about 30% of the diameter formed by the braking surface of the brake drum.

32. Brake on p, in which the Cam includes a first protrusion and a second protrusion, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile, the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is from the narrowing of the Cam to the top of one of the ledge, while the second section forms a the edge, reaching at least one portion of the pocket.

33. Brake, containing the brake drum, which forms the braking surface;
the first and second brake shoes mounted to rotate on the first ends of the inside of the brake drum;
the first Cam followers element that is engaged with the first brake Shoe near its second end;
second Cam followers element which is in engagement with the second brake Shoe near its second end;
the Cam which is engaged with the first and second jaw tracking elements and has an axis of rotation, and the rotation of the Cam in opposite directions of rotation moves the first and second brake shoes in position of engagement and disengagement with the braking surface, the diameter of the circle formed by the rotation of the Cam about the axis of rotation, at least about 5 times greater than the diameter of the circle formed by the rotation of the narrowing of the Cam relative to the axis of rotation.

34. Brake on p, wherein said Cam includes a first protrusion and a second protrusion, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile, the first and second sections form a pocket, the purpose is the one element Cam followers of the first and second Cam spy items when the first and second brake shoes are in a position of disengagement from the surface of the braking, and the specified pocket comes from narrowing of the Cam to the top of one of the ledge, while the second section forms an edge going at least through one portion of the pocket.

35. Brake, containing the brake drum, which forms the braking surface;
the first and second brake shoes, each of which contains first and second jumper set to rotate at the first end and the brake plate supported on the first and second bridges;
the first Cam followers element located at the second ends of the first and second jumper of the first brake Shoe;
second Cam followers element located at the second ends of the first and second jumper of the second brake Shoe; and a Cam which is engaged with the first and second jaw tracking elements and has an axis of rotation, and the rotation of the Cam forms a cylinder, running in the axial direction at the axial ends of the Cam;
and the first return spring connecting the first and second brake shoes and located at least partially within the cylinder.

36. Brake on p, in which the first return spring connects the first jumper of the first and second brake shoes.

37. Brake on p that to omnitele contains the second return spring, connecting the first and second brake shoes and located at least partially within the cylinder.

38. Brake according to clause 37, in which the first and second return springs for connecting the first bridge and the second bridge, respectively, the first and second brake shoes.

39. Brake on p, in which the Cam includes a first protrusion and a second protrusion, and at least one projection of the first and second protrusions includes a first section having a first profile and a second section having a second profile different from the first profile, the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is from the narrowing of the Cam to the top of one of the ledge, while the second section forms a the edge, reaching at least one portion of the pocket.

40. Brake Shoe containing the first and second crosspieces, each of which has first and second ends; a brake plate supported on the first and second bridges; and a brake pad located on the brake plate; and the first and second jumper shifted from each other between the first and second ends of the first and second jumpers and the image of the t angle to each other near the first end, the first ends of the first and second jumper is configured to receive Cam followers element having first and second working surfaces, which are located outside of the first and second jumper and made with the possibility of engagement with the Cam which selectively forces the Cam servo element out and enters the brake pad into engagement with the braking surface.

41. Brake Shoe p, in which the first and second jumpers are engaged with each other near the first ends.

42. Brake, containing the brake drum, which forms the braking surface;
the first and second brake shoes, each of which contains first and second crosspieces, each having first and second ends, mounted to rotate on the first ends; a brake plate supported on the first and second bridges; and a brake pad located on the brake plate;
the first Cam followers element located at the second ends of the first and second jumper of the first brake Shoe and having first and second surfaces;
second Cam followers element located at the second ends of the first and second jumper of the second brake Shoe and having first and second surfaces; and,
the Cam, which is located in sacal the Institute with the first and second working surfaces of the first and second Cam spy items moreover, the rotation of the Cam in opposite directions of rotation about the axis of rotation urges the first and second brake shoes to move between positions of engagement and disengagement with the braking surface,
the first and second jumper of the first brake Shoe is displaced from each other between the first and second ends of the first and second jumper of the first brake Shoe and form an angle with each other near the first ends of the first and second jumper of the first brake Shoe, the first and second surfaces of the first Cam followers of the element are located outside of the first and second jumper of the first brake Shoe.

43. Brake according to § 42, in which the first and second jumper of the second brake Shoe is displaced from each other between the first and second ends of the first and second jumper of the second brake Shoe and form an angle with each other near the first ends of the first and second jumper of the second brake Shoe, the first and second surfaces of the second Cam followers of the element are located outside of the first and second jumper of the second brake Shoe.

44. Brake according to § 42, in which the Cam includes a first protrusion and a second protrusion, and at least one projection of the first and second protrusions includes first ucast is, having a first profile and a second section having a second profile different from the first profile, the first and second sections form a pocket designed to receive one Cam followers of the element from the first and second Cam tracking elements when the first and second brake shoes are in a position of disengagement from the braking surface, and the pocket is from the narrowing of the Cam to the top of one of the ledge, while the second section forms an edge going at least through one portion of the pocket.

45. Brake according to § 42, in which the Cam has first and second grooves between the axial ends of the Cam, and the first groove is designed to receive the first ends of the first and second jumper of the first brake Shoe and a second groove is designed to receive the first ends of the first and second jumper of the second brake Shoe when the first and second brake shoes are in a position of disengagement from the surface of the braking.



 

Same patents:

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FIELD: automotive industry.

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FIELD: automotive industry.

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FIELD: machine building.

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