Rib of brake block with double sharp bend and wide site. RU patent 2509237.

FIELD: machine building.

SUBSTANCE: shoe of a brake block comprises the first rib, the second rib, a pad base arranged along circumference on outer sections of the first and second ribs, and fixation of the return spring. Fixation of the return spring is provided by the first rib, with which the return spring of the brake block is connected so that the central line of the return spring is displaced from the axial central line of the pad base and is arranged in the axial direction between the external edge of the central section of the first rib and the external edge of the second end section of the first rib. The drum brake comprises the brake block shoe.

EFFECT: reduced side load at shoes during operation of a drum brake and elimination of shoe swing or inclination.

20 cl, 5 dwg

The invention relates to the main brakes, equipped ribs drum brake pads that are tilted or have «a sharp bend» dockable ends to create more sustainable sites on the anchor fingers drum brakes. The invention can be used in conjunction with already in use standard drum brakes, but is particularly predominant and cost-effective when used in configurations that have shifted spring return.

Design with offset by the return spring increases lateral load drum brake pads and makes the ends of the pads to break away from the anchor finger. Because the drum brake, use of uniaxial return spring, are unbalanced forces, brake pads have a tendency to swing» or bend and break away from one side of anchor finger. This tilt drum brake shoes creates a lot of technical problems.

To address this roll or tilt currently used brake pads that somehow capture the anchor finger. In General, this is accomplished using a fully captured anchor finger. Edge full circle 360 degrees which is attached to the anchor finger and holds a block from tearing is standard.

In another way of capturing anchor fingers are four additional plates. These plates have two holes, with one of the holes is intended for putting on the anchor finger, and the other hole is designed to move the finger in a hole spring return. These plates are working on a «scissors», so that each block has a plate on both sides (four plates at the end of wheels). These plates also hold the pads from tearing.

In the document of the US 1667375 (Dodge) describes the design of the block with the edge with a sharp bend designed to minimize production costs through the use of a set of stamped levers with a sharp bend.

The US document 2928510 (Kay) refers to the construction of the brake pads in which mounting point on the edge as are the locations of springs to minimize deformation of the brakes.

In the US 4773512 (Murakami) described pad drum brakes with many reinforcing flanges for noise reduction. Flanges are located in pairs in length ribs to increase torsional stiffness and reduce noise.

Document DE 3818235 (Martin) describes the edge of brake pads with two sharp bends, but various forms. The aim is to save weight.

In the US 2928506 (Goldman) described the brake pads from the Central bridge on each block on which secures the return spring. This configuration reduces the wear anchor finger.

The US document 3877141 (Bradshaw and others) refers to a method of manufacture of brake pads with one edge with a sharp bend. A sharp bend is added to improve the casting.

US 4360959 (Jobannesen) refers to a method for brake pads from the individual workpieces. Manufacturing is simplified by double ribs and lack of welding.

The US document 4732240 (Flaim) refers to the method of stabilization and improvement of drum brakes by changing the lengths of the brake discs.

In the document of the US 5515952 (Jackson) is disclosed brake pad weight, shock-absorbing a lot to reduce noise.

The US document 6336533 (Pollock and others) describes a special spring, installed between the shelves edges to reduce noise and smooth fit lining to the drum.

In the Shoe drum brakes with first and second ribs, according to the invention, the first edge is the first end section, located next to actuate the brake pads, second end Cup next to the anchor element brake pads, and the Central section that passes between the first and second end sections. Similarly, the second edge contains the end of the first section, located next to actuate the brake pads, second end Cup next to the anchor element brake pads, and the Central section that passes between the first and second end sections the second one. At least one ground overlay is on the circumference on the outer stations of the first and second ribs, and a pin or other mounting spring return provided, at least at first rib. Brake pad, in particular, is configured so that the spring brake pads, which are connected with mounting spring return, so located that the Central line of the spring return of the displaced from the Central axial line base lining, but is located in the axial direction from the inner side of the outer edge of the end of the second section of the first one.

In the preferred versions of the end of the first section, the second end section and the Central section of each edge pads are essentially parallel to each other. Each edge pads may contain the first shifted section, located between the end of the first section and the Central section, and the second shifted section, located between the Central section, and the second end of the section, so that the end of the first section, the Central section and the second end of the section were in different parallel planes. The first and second shifted section may be held on the planes, forming a sharp angles relative to these parallel planes.

The first important feature of this design is that the area of the ribs at anchor finger exceeds the distance that the return spring is removed from the Central line of the spring return. Thus, the Central line is shifted springs is located between the two outer edges of the extended ribs anchor finger. Both of these choices may be direct or tapering ribs, which are much more on the anchor fingers. The benefits of this configuration minimizes the swaying brake pads and reduce vibration and noise.

While stamped ribs brake pads previously had a sharp bend at the end of Cam, the presence of sharp bends at the end of anchor finger ribs brake pads is considered as a new feature. Adding sharp bends with the purpose of stabilization of brake pads on the toes is also seen as a new feature, and the way in which swinging gets pads of the present invention, is considered further as different from the previous methods. Due to the different sections of the ribs of the present invention to increase torsional strength. More stable anchor the ends of the fingers brake pads facilitate sustainable response to the braking force to make such reactions are more predictable and reduce vibration and noise.

Due to sharp curve at fixed the end of the edge of the brake pads, according to the invention, may provide a more stable platform on the anchor finger. This improvement can currently be used with a standard brakes, but, again, provides the main advantage in the use of the displaced spring return, which increases lateral load on the pads and causes them to break away from the anchor finger.

Wider courts on anchor fingers drum brakes could be obtained by adding cones or sharp bends in the ribs with fixed ends with bolt, welding, gluing, stamped or other connection or additional education plates on the sides currently used edges. These configurations also serve the purpose of the invention consists in reducing vibration and noise brakes, ensuring a more sustainable responses to torque and preventing pads for rocking lever fingers through the exposure shifted spring return. - Block with double sharp bend or block with a wide platform solves the problem of swinging pads more easily and efficiently than captured anchor fingers, which are costly and difficult to maintain.

It is considered that the production of edges is very similar to the production of the ribs with one sharp bend, currently used. As for molded ribs, the profile of fin is provided by stamping on a regular press or press for cutting accurate parts. Profile edges can also be obtained from the waterjet cutting, sharp with wire, sharp electroerosion machine or laser cutting of the corresponding sheet. The profile can be formed in the stamp to add sharp bends. Currently used configuration with one sharp bend, and therefore will require a little more complicated instrument. Bending can be a single bend, smooth cone, double bend under 90 or their combination. In addition to a sharp bend additional material can be simply installed on the currently used rib with screws, welding, pins or pins with the aim of obtaining a wider platform.

This element can be set to collect (welded) pads (continuous corner seam, intermittent roller weld point or relief weld) or pads, manufactured using hot plug pins.

At any pressed the brake pads can be a double sharp bend. The base can be installed by any specified manner, namely by welding, hot plug pins, etc. In General, in the manufactured pads are various grades of steel. For more broad landings can be installed additional material on bolts.

The invention also relates to the manufacture of edges to create a broader platform and, in General, to the exclusion of how expensive plates and captured anchor fingers.

Wide Playground brake pads, according to the invention, increases the lever that has to be overcome is offset by the return spring, to call swinging or separation pad.

The issues addressed by the present invention, there whenever you use the return spring. Most of the time is used centered the return spring. This symmetry load is optimal, but in some cases impossible. If the design affects shifted the spring, there are problems considered by the present invention.

The present invention provides a low cost, design, working in hazardous conditions and do not require any additional parts that do not require little maintenance and are compatible with most currently used most common constructs drum brakes.

Wider rib create a more rigid support under a thin grounds brake pads to prevent lung bending grounds.

This invention is illustrated by drawings, which presents the following:

figure 1 - perspective view of known design drum brakes;

figure 2 - a magnified view in perspective anchor finger Assembly of figure 1, as well as certain elements related anchor finger Assembly;

figure 3 - simplified view the bottom on the design, this type of figure 1 and 2, intended to facilitate understanding of the problems associated with conventional configurations drum brakes;

figure 4 - perspective view drum brake pads according to the first variant of execution of the invention;

5 is a kind of drum brake pads on Fig. 4, showing the relationship between the centre line of the spring return, longitudinal centre line of the grounds of drum brake lining and the outer margin of the end of the section edges brake pads.

Figure 1 shows a typical configuration drum brakes, which uses ribs drum brake pads, according to the present invention. Design figure 1 contains a pneumatic or hydraulic drive 20, coupled with linkage design with rotating shaft, passing through the Bush 22. Rotary shaft ends in bilateral Cam 24 having a curvilinear surface of 26. Support 28 witness elements of the Cam, which, if it is preferred, can be configured as rollers, the usual way is fastened to put in action the ends of a pair of pads 34 drum brakes. Each bearing is located 28 so that it engages with relevant curvilinear surface 26 under the action of bias springs, provided by the spring of 32 return. The end of the spring 32 return are placed in holes 33, made near driven ends of the pads 34 drum brakes.

As shown in figure 1 and 2, each block 34 drum brakes contains a pair of parallel edges 30 brake pads. The basis 36 overlay in the form of the rings formed together with each pair of parallel edges 30 or attached to each pair of these ribs and friction linings 38 mounted on a rivet or otherwise attached to each base lining.

Stationary support disk 40 attached to the casing axis or other fixed to the vehicle structure, supports the anchor design 44, Bush 22 and various other components of the whole drum brake Assembly, shown in figure 1. Anchor design 44 fastened properly (for example, with the help of bolts, rivets, welds, soldering, etc.) the supporting disk or can be cast as an integral part or otherwise formed together with the supporting disk. Design 44 supports or forms an anchor element 46, for example anchor finger or anchor fingers that rested fasten the ends 48 pads 34 drum brakes. Fasten the ends 48 drum brake shoes are displaced and are in contact with the anchor element 46 using anchor springs 50, continuing between the opposite edges 30 brake pads 34 and attached to the ribs. Figures 1 and 2 show only one of these anchor springs 50. The ends of anchor springs 50 placed into the holes at the edges 30, executed next to fasten the ends of the pads 34 drum brakes, which abuts the anchor element 46.

Figure 3 - simplified view the bottom on the design, similar to the design shown in figure 1 and 2, with anchor springs 50, anchor element 46 and spring 32 return are shown schematically. Some problems with normal configuration drum brakes, shown in figure 1 and 2 will become clear from the following descriptions with reference to figure 3. These problems are exacerbated when there are attempts to use your fingers displaced return spring, such as a spring, which should be described, instead of a spring return, such as a spring 32, shown in figure 1 and 2, with the ends of which are fixed for holes 56, made in the ribs 30.

However shows the configuration contains no internal spring return corresponding to the outer spring 32 return. Power F3 applied to the outer pair of opposite edges, creates moment P3·X 3 , which has the tendency to rotate or skew the opposite external edges 30, tear off fasten the ends 48 internal pairs of opposite edges from the anchor element 46 and turn the outside edges of around 30 contact points 49. Vibration arising from operation of the vehicle, shock action, caused by uneven road surface or obstacles on the road surface, etc. reinforce this trend, which leads to internal displacement dockable all 48 of the item 46, as shown. In this case the length of LENGTH 2» internal anchor springs periodically becomes greater than the length of LENGTH 1» external anchor spring offset the moment P3·X 3 and periodically balanced by the difference between the moments P2·X 2 - P1·X 1 . It is desirable to increase the stability of the fixed end of the edge of the pad to facilitate uniform wear pads, and to prevent deterioration or destruction anchor springs from fatigue loads and minimizing other cases, a negative influence is shown offset loading brake pads.

Figure 4 - perspective view pads 60 drum brakes, according to the first variant of execution of the invention. A pair of pads 60 drum brakes are used instead of ordinary shoes, such as pads 34 shown in Fig. 1, although it may require some modification, such as extending the anchor element.

Each block contains 60 support 62 witness element of the Cam. In this configuration, bearing 62 witness element Cam configured in the form of video, attached with clamps 64 to the protruding sections 66 of the first and second ribs 68 brake pads (also called ribs brake pads replaced with «dual sharp bend»), as will be described. Each bearing 62 located such that it engages with relevant curvilinear surface under displacement of the spring, provided by spring 32' return (figure 5), similarly supports 28 in a typical configuration, drum brakes, shown in figure 1 and 2. The end of the spring return, which is not shown in figure 4, placed in the grooves 70 performed next to the outer ends of fastening of the spring return, educated here your finger 72 mounting springs, and not the hole, made in the ribs drum brake shoes, as shown in figure 1-3. Finger 72, if desired, can not be installed; in this case, the end of the spring return can be fixed in the opposite holes 80, which will be described in detail below, and which in this case can form the mounting spring return.

Figure 4 also shows the base 74 overlays in the form of the rings formed with shows a pair of ribs 68, or welded or soldered or otherwise attached to the couple of ribs. Friction linings (not shown in figure 4) can be attached to the grounds of plates with rivets, screws or fasteners other types through the holes at the bottom with the help of gluing structure etc. figure 4 shows a base pair 74 linings, though, if desired, can be used with one ground overlay two or more grounds overlays.

Ribs 68 brake pads associated with terminal block 60 drum brakes, shown in figure 4, in essence, form mirroring each other. In the displayed configuration, if you look in the radial direction from the inside pads 60, starting with the first set in motion the tail section 83, forming an exposed section 66, each edge contains 68 first shifted section 84, continuing towards the plane containing driven end section 83, at an angle theta 1 , greater than 0 deg, to the Central section 86, which, as shown, continues in a plane approximately parallel to the plane of which passes driven end section 83. The Central section 86 rib ends at the second shifted section 88, which runs off the main section of the angle theta 2 greater than 0 degrees and ending at the second fixed limit section 90 ribs, continuing on a different plane approximately parallel planes, which continue Central section 86 ribs and a driven leaf section 83.

The second limit section 90 forms fasten the ends 92 drum brake pads that are shifted to engage with anchor finger or other anchor element (not shown in figure 4). Ribs 68 with openings 94, which fit anchor the ends of the springs (not shown in figure 4) to offset all 92 brake pads with the purpose of contact with the anchor element, as described.

As shown, the corners prot 1 and 0 2 is approximately equal to 30, but can be used for a wide range and variety of acute and other corners. It will be shown that every angle theta 1 and 0 2 forms in the edge of the brake pads inclined section or a sharp bend. As an option, can be used straight edges, which extend from the driven end of the section to fasten the ends of the drum brake pads, for example tapering ribs; however, you must ensure that fasten the ends of the drum brake pads were installed on the anchor finger or another anchor element at a great distance, so that Central line shifted spring return was between the two outer edges of the ribs brake pads.

Referring to figure 5 shows mentioned above finger 72 mounting springs passing through holes 80 made in the opposite first displaced sections 84 adjacent edges 68 brake pads. Finger 72 can be welded, soldered or otherwise attached holes 80. Optionally, in the holes 80 could thus to establish a separate fingers. Alternatively, you can use one finger mounting, lasting only through the outer hole 80. In addition, as stated above, if desired finger 72 mounting spring may not be installed; in this case, the end of the spring 32' return can be mounted in the hole 80 made in the opposite lasts 60 drum brakes.

The mounting spring return is provided, at least one of the edges 68, since the end of the spring return is fixed or finger 72, or in the hole 80 of this edge. Spring 32' return brake pads connected with fixing this spring return so that the Central line 102 spring return shifted from Central axial line 100 grounds 74 problems, but located inside or on the inner side of the outer edge 91 end of the second section 90 ribs 68.

The foregoing description is only intended to explain the invention and is not intended to limit. As specialists in this field of technology can meet the modifications described options, including the nature and essence of the invention, it is understood that the present invention includes everything that is included in the appended claims and equivalents.

1. Pad drum brakes, containing: the first edge, including the end of the first section, located next to actuate the brake pads, second end Cup next to the anchor element brake pads, and the Central section that passes between the first and second integral sections of the first one, the second edge, including the end of the first section, located next to actuate the brake pads, second end Cup next to the anchor element brake pads, and the Central section that passes between the first and second integral sections of the second one, at least one ground overlays, located on the circumference of the outer stations of the first and second ribs, and the mounting spring return, provide at least the specified first rib, which the recoil spring brake pads connected to such way that the Central line of the spring return of the displaced from the Central axial line at least one lining and is located in the axial direction between the outer margin of the Central section of the first one and the outer margin of the end of the second section of the first one.

2. Pad drum brakes under item 1, in which the end of the first section, the second end section and the Central section of each brake pads are essentially parallel to each other.

3. Pad drum brakes under item 2, in which each brake edge contains the first shifted section, located between the end of the first section and the Central section, and the second shifted section, located between the Central section, and the second end of the section, and the end of the first section, the Central section and the second end of the section located in different parallel planes.

4. Pad drum brakes under item 1, where the mounting spring return is executed in the form of a finger, attached to the first rib.

5. Pad drum brakes under item 4, in which the finger attached to the first rib and the second edge.

6. Pad drum brakes under item 3, in which the first and second displaced sections are planes, forming sharp corners on parallel planes.

7. Pad drum brakes under item 1, in which each brake edge contains the first shifted section, located between the end of the first section and the Central section, and the second shifted section, located between the Central section, and the second end of the section.

8. Pad drum brakes under item 7, in which the end of the first section, the second end section and the Central section of each brake fins are essentially parallel to each other.

9. Pad drum brakes under item 2, in which the mounting spring return is executed in the form of a finger, attached to the first rib.

10. Pad drum brakes under item 3, in which the mounting spring return is executed in the form of a finger, attached to the first rib.

11. Drum brake, comprising: the block, which has the first edge, including the end of the first section, located next to actuate the brake pads, second end Cup next to the anchor element brake pads, and the Central section that passes between the first and second integral sections of the first one, the second edge, including the end of the first section, located next to actuate the brake pads, second end Cup next to the anchor element brake pads, and the Central section, passing between the first and second integral sections of the second one, and at least one ground overlays, located on the circumference of the outer stations of the first and second ribs, and return spring brake pads are installed, at least on the first edge so that the Central line of the spring return of the displaced from the Central axial line at least one lining and is located in the axial direction between the outer margin of the Central section of the first one and the outer margin of the end of the second section of the first one.

12. Drum brake under item 11, in which the end of the first section, the second end section and the Central section of each rib brake linings, essentially parallel to each other.

13. Drum brake under item 12, in which each edge brake pads contains the first shifted section, located between the end of the first section and the Central section, and the second shifted section, located between the Central section, and the second end of the section, at the end of section, Central section and a second end section are located in different parallel planes.

14. Drum brake under item 11, where the mounting spring return is executed in the form of a finger, attached to the first rib.

15. Drum brake under item 14, which finger is attached to the first rib and the second edge.

16. Drum brake under item 13, in which the first and second displaced sections are planes, forming sharp corners on parallel planes.

17. Drum brake under item 11, in which each brake edge contains the first shifted section, located between the end of the first section and the Central section, and the second shifted section, located between the Central section, and the second end of the section.

18. Drum brake under item 17, in which the end of the first section, the second end section and the Central section of each rib the brake pads are essentially parallel to each other.

19. Drum brake under item 12, in which the mounting spring return is executed in the form of a finger, attached to the first rib.

20. Drum brake under item 13, where the mounting spring return is executed in the form of a finger, attached to the first rib.