Rib of brake block with double sharp bend and wide site

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 basic brakes, equipped with ribs pads drum brake, which is inclined, or have a sharp bend at the fixed ends to create a 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 having a spring biased return.

Design with offset return spring increases the lateral load on the pads drum brake and causes the ends of the pads to break away from the anchor finger. Because the drum brake using uniaxial return spring, there are unbalanced forces, the brake pads have a tendency to sway or bend and break away from one side of the anchor finger. Such tilting of the drum brake shoes creates a lot of technical problems.

To address this rocking or tilting currently used brake pads, which somehow capture the anchor finger. In General, this is accomplished by fully captured anchor finger. Edge with a full circle of 360°, which is mounted on the anchor finger and keeps the pad from the substrate, is standard is poor.

In another way of capturing the anchor finger, there are four additional plates. These plates have two holes, with one of the holes intended for putting on the anchor finger, and another hole is designed to move your finger in the hole of the spring return. These plates work on the principle of "scissors", so that each block has a plate on both sides (four plates at the end of the wheel). These plates also keep the pads from tearing.

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

The document US 2928510 (Kay) refers to the construction of the brake pads, in which the attachment points on the edge are also the locations of springs to minimize deformation of the brakes.

In the US 4773512 (Murakami) described pad drum brake with many reinforcing flanges to reduce noise. The flanges are located in pairs along the length of the ribs to increase torsional stiffness and reduce noise.

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

In the US 2928506 (Goldman) described the brake pads with the Central bridge on each block which is attached a spring return. This configuration reduces the wear of the anchor finger.

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

US 4360959 (Jobannesen) refers to a method for producing brake pads from separate blanks. Manufacture is simplified by double edges and the absence of welding.

The document US 4732240 (Flaim) relates to a method of stabilizing and improving drum brakes due to the change of the lengths of the brake disk.

In the document US 5515952 (Jackson) disclosed brake pad weight, shock-absorbing mass in order to reduce noise.

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

In a Shoe drum brake with the first and second edges, according to the invention, the first edge has a first end section that is located next to actuate the brake pads, the second end section that is adjacent to the anchor element of the brake pads, and a Central section that passes between the first and second end sections. Similarly, the second edge includes a first end section that is located next to actuate the brake pads, the second end section, the RA is put next to the anchor element brake pads, and the center section passing between the first and second end sections of the second ribs. At least one ground pads are located around the circumference on the outer areas of the first and second edges, and a pin or other fastening spring return is provided, at least at the first edge. Brake pad, in particular, is configured so that the spring brake pads, which are connected with the mounting spring return, arranged so that the Central line of the spring return is offset from the axial center line of the base plates, but is located in the axial direction on the inner side of the outer edge of the second end section of the first edge.

In preferred embodiments, the first end section, a second end section and the Central section of each rib pads are essentially parallel to each other. Each edge of the pad may include a first offset section located between the first end section and the Central section, and the second offset section, located between the Central section and second end section so that the first end section, a Central section and second end section lying in different parallel planes. The first and second offset section can be in planes that form acute angles with respect to these parallel PLoS the awn.

The first important characteristic of this design is that the platform edges at anchor finger exceeds the distance at which the return spring is removed from the center line of the spring return. Thus, the Central line of the offset spring is located between the two outer edges of the extended edges of the anchor finger. How options can be used straight or tapering ribs that are much wider on the anchor fingers. The benefits of this configuration minimizes the swinging brake pads and reduce vibration and noise.

While the stamped edges of the brake pads previously had a sharp bends at the ends of the Cam, the presence of sharp bends at the ends of the anchor finger edges of the brake pads is considered as a new feature. Adding sharp bends to stabilize the brake pads on the fingers is also considered as a new feature, and the way in which prevents rocking of the pad of the present invention, additionally regarded as different from the previous methods. Due to the presence of different areas of the ribs of the present invention increases the torsional strength. More sustainable ends of the anchor finger brake pads facilitate sustainable response to the braking effort, delaytime response more predictable and reduce vibration and noise.

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

Wider platform to anchor the fingers drum brakes could be obtained by adding cones or sharp bends in the ribs with fixed ends by means of bolting, welding, adhesive, extruded or other compounds or the formation of additional plates on the sides currently in the ribs. These configurations also serve the purposes of the invention, consisting in the reduction of vibration and noise of the brakes, to ensure a more sustainable responses to torque and preventing rocking pads on the anchor fingers in the feedback offset spring return. Block with dual sharp bend or a Shoe with a wide platform solves the problem of swinging pads more simply and efficiently than captured anchor fingers, which are costly and difficult to maintain.

It is believed that the production of ribs ve is ima similar to the production of edges with one sharp bend, currently used. As for the stamped edges, the profile of the ribs is provided by stamping on a conventional press or press for cutting accurate parts. The profile of the ribs can also be obtained by water-jet cutting, cutting with wire, cutting electroerosion machine or laser cutting from the corresponding sheet. The profile can be formed in the stamp to add a sharp bends. Currently used configuration with one sharp bend, and therefore will require a little more complex tool. The bend may be a single curved, smooth cone, double bend 90°, or their combination. In addition to the sharp bending of the additional material can be simply installed on the currently used edge by means of bolts, welding, pins or bolts in order to obtain a broader platform.

Such an element can be set to collect (welded) pads (continuous corner seam, intermittent roller weld, spot or embossed weld seam) or pads manufactured using hot plug pins.

On any pressed brake Shoe can be a double sharp bend. The base can be installed in any specified manner, namely by welding, hot plug pins, etc. In General, izgotavlivaem the pads are various grades of steel. For a more extensive areas may be an additional material on the bolts.

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

The present invention offers a cost effective way to solve this problem, and pads with two sharp bends are not known. It is obvious that the proposed solution has not previously been suggested, because it is difficult to get a broad base of clearance from the wheel hub brakes at full output pads of the building. In addition, captured anchor fingers were used in the past and they are well known, and straight edges, in General, preferred for reasons of cost. And finally, use springs with a very small offset due to the issues to be discussed; this creates problems, so can be used with spring.

Wide Playground brake pads, according to the invention, increases the lever arm that must be overcome biased by the return spring to cause loosening or separation pads.

The problem addressed by the present invention, are present whenever used nextentryoffset the return spring. Most of the time is used scent the new the return spring. This symmetry of the load is optimal, but in some cases impossible. If construction affects biased spring, there are problems addressed by the present invention.

The present invention provides a low cost, design, working in hazardous conditions and does not require any additional parts, does not require complicated maintenance and is compatible with most currently used the most common designs of drum brakes.

Wider edges create a more rigid support for thin bases brake pads to prevent easy bending of the grounds.

The present invention is illustrated by drawings, which presents the following:

figure 1 is a perspective view of known construction drum brakes;

figure 2 is an enlarged perspective view of the anchor of the finger Assembly of figure 1, as well as certain elements related anchor finger Assembly;

figure 3 is a simplified bottom view of a construction similar to the construction of figure 1 and 2, designed to facilitate understanding of the problems associated with conventional configurations drum brakes;

4 is a perspective view of the pad drum brake according to the first variant implementation of the invention;

5 is a view of the pad drum brake according to Fig. 4, dormancy is to substantiate the relationship between the Central line of the spring return, the axial center line of the base of the drum brake linings and outer edge of the end section of the ribs of the brake pads.

Figure 1 shows a typical configuration of a drum brake, which uses the edges of the pad drum brake according to the present invention. The design in figure 1 contains a pneumatic or hydraulic actuator 20, which is connected with lever design with a rotary shaft passing through the sleeve 22. The rotary shaft ends in the double-sided Cam 24 having a curved surface 26. Supports 28 spy Cam elements, which, if it is preferred, can be configured as rollers, in the usual way are attached to the driven ends of the pair of pads 34 of drum brakes. Each support 28 is located so that it engages with a corresponding curved surface 26 under the action of bias spring tension provided by spring 32 to return. The ends of the spring 32 returns placed in the holes 33, made near the driven ends of the pads 34 of drum brakes.

As shown in figures 1 and 2, each block 34 drum brake comprises a pair of parallel ribs 30 brake pads. The base 36 of the pads in the form of part of the ring formed together with each pair of parallel edges 30 and secures the I to each pair of these ribs, and friction linings 38 mounted on a rivet or otherwise fasten to each of the base pads.

Stationary support disk 40, is attached to the casing axis or other fixed structure of the vehicle, supports the anchor structure 44, the sleeve 22 and the various other components of the entire drum brake Assembly shown in figure 1. The anchor structure 44 is attached properly (for example, using bolts, rivets, welds, brazing, etc.) the supporting disc or may be molded as an integral part or otherwise formed together with the supporting disk. Design 44 supports or forms the anchoring element 46, for example an anchor finger or anchor fingers, which rest against the pin ends 48 pads 34 of drum brakes. Fasten the ends 48 of drum brake shoes move and come into contact with the anchoring element 46 by means of anchor springs 50, continuing between the opposite edges 30 of the brake pads 34 and attached to these edges. Figure 1 and 2 shows only one of these anchor springs 50. The ends of the anchor springs 50 are placed in the holes 56 in the ribs 30, made near the fixed ends of the pads 34 drum brakes, which abuts the anchoring element 46.

Figure 3 is a simplified bottom view of the design, similar in design, asanoi figures 1 and 2, this anchoring of the spring 50, the anchoring element 46 and the spring 32 returns are shown schematically. Certain problems associated with the conventional configuration of the drum brake shown in figures 1 and 2, will become clear from the following description with reference to figure 3. These problems are amplified when trying to use your fingers biased return spring, such as spring, to be described, instead of a spring return, such as a spring 32, shown in figures 1 and 2, having ends that are geared for holes 56, made in the ribs 30.

In the construction shown in figure 3, the force F1 applied to the opposite edges 30 of the right anchor spring 50 from the outside, substantially balanced by the force F2 applied to the opposite edges 30 of the left anchor of the spring 50 on the inner side.

However, illustrates the configuration contains no internal spring return corresponding to the outer spring 32 return. The force F3 applied to the outer pair of opposite edges, creates a point P3·X3that has a tendency to rotate or tilt the opposite outer edges 30, to tear fasten the ends 48 of the inner pair of opposite edges from the anchor element 46 and rotate the outer edges 30 around the contact points are, resulting from operation of the vehicle, the shock effect caused by uneven road surface or obstacles on the road surface, etc. reinforce this trend, resulting in displacement of the inner fixed end 48 of element 46, as shown. In this case, the length "LENGTH 2" internal anchor springs periodically becomes greater than the length "LENGTH 1" outer anchor spring with the displacement of the point P3·X3and occasionally balanced by the difference between the points P2·X2- P1·X1. It is desirable to increase the stability of the fixed end of the edge pads to promote even pad wear, prevent deterioration or destruction of the anchor spring from fatigue loads and to minimize other cases, the negative impact is shown displaced in the loading of the brake pads.

4 is a perspective view of the pad 60 drum brakes, according to the first variant implementation of the invention. A pair of pads 60 drum brake is used instead of the usual pads, such as pads 34, shown in Fig. 1, although it may require some modifications such as elongation of the anchor element.

Each block 60 comprises a support 62 spy Cam element. In this configuration, the bearing 62 spy Cam element configured in the form of ro the ICA, attached with clamps 64 to the protruding sections 66 of the first and second ribs 68 brake pads (also referred to here as the edges of the brake pads with "double sharp bend"), as will be described. Each bearing 62 is located so that it engages with a corresponding curved surface under the action of bias spring tension provided by spring 32' return (figure 5), similar to the supports 28 in the normal configuration, the drum brake shown in figures 1 and 2. The ends of the spring return, which is not shown in figure 4, is placed in the grooves 70, made near the outer ends of the mounting spring return, formed here by the finger 72 of the fastening of the spring, not the holes formed in the edges of drum brake shoes, as shown in Fig.1-3. The finger 72, if desired, can not be installed; in this case the ends of the spring return can be secured in 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 of the plates in the form of part of the ring is formed with the pair of ribs 68, or welded, or soldered, or otherwise attached to this pair of ribs. Friction linings (not shown in figure 4) can be attached to the grounds linings with rivets screws or fasteners of other types of through holes 76 in the base with adhesive, etc. Figure 4 shows a base pair 74 of the plates, although, if desired, can be used one base plates or more than two bases overlays.

Ribs 68 brake pads associated with the block 60 of the drum brake shown in figure 4, in substance, form mirroring each other. In the shown configuration, when viewed in the radial direction from the inside pads 60, starting with the first driven end section 83, forming the protruding section 66, each edge 68 includes the first offset section 84, continuing in the direction from the plane containing the driven end section 83, at an angle θ1greater than 0°to the Central section 86, which, as shown, continues in a plane approximately parallel to the plane in which the driven end section 83. The Central section 86 of the rib ends at the second offset section 88, which runs in the direction from the Central section at an angle θ2greater than 0°and ending at the second fixed end section 90 of the ribs, continuing in a different plane, approximately parallel to the planes in which continue center section ribs 86 and the driven end section 83.

The second end section 90 forms fasten the ends 92 of the pad drum brake, is the quiet shift for engagement with the lever by a finger or other anchoring element (not shown in figure 4). Ribs 68 with openings 94 in which are placed the ends of the anchor spring (not shown in figure 4) for displacement of the ends 92 of the brake pads to contact with the anchor element, as described.

As shown, the angles θ1and θ2approximately 30°, but can be used with a wide range and variety of acute and other angles. It will be shown that each angle θ1and θ2forms at the edge of the brake pads inclined section or "sharp bend". Alternatively can be used straight edges, which extend from the driven end of the section to fasten the ends of the pads drum brake, for example tapering ribs; however, you must ensure that fasten the ends of the pads drum brakes were installed on the anchor finger or other anchoring element at a great distance, so that the Central line of the offset spring return was between the two outer edges of the ribs of the brake pads.

With reference to figure 5 shows the above-mentioned finger 72 of the fastening of the spring passing through the holes 80, made in opposite the first offset sections 84 adjacent ribs 68 brake pads. The finger 72 can be welded, soldered or otherwise attached in the holes 80. If desired, the holes 80 could be accordingly set the ü individual fingers. Alternatively, you can use one finger mounting, continued only through the outer hole 80. In addition, as indicated above, if desired, the finger 72 of the fastening of the spring can be omitted; in this case the ends of the springs 32' return can be mounted in the holes 80, executed in other blocks 60 drum brakes.

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

The above description serves only to explain the invention and is not intended to be limiting. As specialists in this field of technology can meet modifications of the described embodiments, including the nature and essence of the invention, it is understood that the present invention includes everything that is included in the scope of the applied claims and equivalents.

1. Shoe drum brake, contains:
the first edge includes a first end section located is built next to actuate the brake pads, the second end section that is adjacent to the anchor element of the brake pads, and a Central section that passes between the first and second end sections of the first edge,
the second edge including a first end section that is located next to actuate the brake pads, the second end section that is adjacent to the anchor element of the brake pads, and a Central section that passes between the first and second end sections of the second ribs,
at least one ground pads located around the circumference on the outer areas of the first and second edges, and
the mounting spring return, provide at least a first edge, with which the return spring of the brake pads is connected so that the Central line of the spring return is offset from the axial center line of at least one base pad, and is located in the axial direction between the outer edge of the Central section of the first edge and the outer edge of the second end section of the first edge.

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

3. Shoe drum brakes on p. 2, in which each brake edge contains the first CME the military section, located between the first end section and the Central section, and the second offset section, located between the Central section and second end section, the first end section, a Central section and second end section are located in different parallel planes.

4. Shoe drum brakes under item 1, in which the mounting spring return is made in the form of a finger attached to the first edge.

5. Shoe drum brakes on p. 4, in which the finger is attached to the first rib and the second rib.

6. Shoe drum brakes on p. 3, in which the first and second offset sections are in planes forming acute angles relative to the parallel planes.

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

8. Shoe drum brake according to p. 7, in which the first end section, a second end section and the Central section of each brake edges are essentially parallel to each other.

9. Shoe drum brakes on p. 2, in which the mounting spring return is made in the form of a finger attached to the first edge.

10. Colock the drum brakes on p. 3, in which the mounting spring return is made in the form of a finger attached to the first edge.

11. Drum brake, contains:
block having a first edge including a first end section that is located next to actuate the brake pads, the second end section that is adjacent to the anchor element of the brake pads, and a Central section that passes between the first and second end sections of the first edge, the second edge including a first end section that is located next to actuate the brake pads, the second end section that is adjacent to the anchor element of the brake pads, and a Central section that passes between the first and second end sections of the second edge, and at least one ground pads located the circumference on the outer areas of the first and second edges, and
spring return brake pads installed, at least on the first edge so that the Central line of the spring return is offset from the axial center line of at least one base pad, and is located in the axial direction between the outer edge of the Central section of the first edge and the outer edge of the second end section of the first edge.

12. Drum brake on p. 11, in which the first end section, the second to the core section and the Central section of each rib brake pads, essentially parallel to each other.

13. Drum brake on p. 12, in which each edge brake pads contains the first offset section located between the first end section and the Central section, and the second offset section, located between the Central section and second end section, the first end section, a Central section and second end section are located in different parallel planes.

14. Drum brake on p. 11, in which the mounting spring return is made in the form of a finger attached to the first edge.

15. Drum brake on p. 14, in which the finger is attached to the first rib and the second rib.

16. Drum brake on p. 13, in which the first and second offset sections are in planes forming acute angles relative to the parallel planes.

17. Drum brake on p. 11, in which each brake edge contains the first offset section located between the first end section and the Central section, and the second offset section, located between the Central section and second end section.

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

19. Drum brake on p. 12, in which is the greater of the spring return is made in the form of a finger attached to the first edge.

20. Drum brake on p. 13, in which the mounting spring return is made in the form of a finger attached to the first edge.



 

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12 cl, 5 dwg

FIELD: railway transport; brakes of rolling stock.

SUBSTANCE: proposed bimetallic brake shoe contains cast iron bar made by molding and steel plate from which steel cylindrical inserts pass into cast iron bar which are arranged in two parallel rows. Inserts are made of material whose abrasiveness is higher than material of bar. Steel plate is placed longitudinally under boss and it covers entire surface of rear side of cast iron bar. It contains middle profiled section enclosing cross boss. Extreme cylindrical inserts in rows are provided with ring grooves on side surface. Diameter d of each cylindrical insert is found from formula d=(0.16-0.32) x B where d is diameter of cylindrical insert; B is width of working surface of shoe, and T-areas of working surface of shoe without inserts is calculated by formula T=(5.0-9.2) x t where T is area of working surface; t is sum of working surfaces of inserts.

EFFECT: improved operating characteristics of shoe, increased balanced service life, reliability, efficiency, increased service life of wheels of rolling stock owing to reduction of their wear caused by brake bimetallic shoes.

10 cl, 4 dwg

The invention relates to mechanical engineering and can be used in the chamber brakes in the automotive industry

The invention relates to a transport machine building, and is intended for drum-type brakes

FIELD: transport.

SUBSTANCE: proposed shoe comprises steel carcass, arc-like body composed of the main and lateral parts in contact with wheel surface. Arc-like body consists of separate elements secured at steel carcass. Note here that elements of the body main part are made from friction material while those of lateral section are made of antifriction material. Friction material friction factor is 1.5-10 times higher and abrasion resistance 1.5-3.5 times higher than those of antifriction material. Friction elements of clamp main part feature different height. Higher friction elements are located at steel carcass edges.

EFFECT: higher safety.

5 cl, 4 dwg

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