Brake shoe and drum brake

Abstract

The utility model discloses a brake shoe and a drum brake. The brake shoe comprises a wing plate, two web plates, a friction plate, a retainer and a roller, wherein the two web plates are fixed on the inner side surface of the wing plate and are oppositely arranged; the friction plate is fixedly connected to the outer side surface of the wing plate; the retainer comprises two opposite side walls, the two side walls are located on the inner sides of the two webs respectively, the side walls and the corresponding webs are connected through connecting pieces transversely penetrating through the side walls and the corresponding webs, an elastic piece is arranged between the two side walls, and the elastic piece is used for extruding the side walls towards the webs corresponding to the side walls so that the side walls can be tightly attached to the webs. A rotating shaft is connected between the two side walls in a penetrating mode, the roller is rotatably arranged on the rotating shaft in a sleeved mode, shaft heads protruding out of the outer side faces of the two side walls respectively are formed at the two ends of the rotating shaft, and the two shaft heads are embedded in concave positions formed in the ends of the two web plates respectively. According to the utility model, the retainer and the web plate can be effectively prevented from being loosened due to vibration of a vehicle chassis, and the safety of a vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicle braking, in particular to a brake shoe and a drum brake. Background Art

[0002] Commercial vehicles usually use two braking methods, one is drum brake and the other is disc brake. Drum brake generally includes a brake drum, two opposing brake shoes installed in the brake drum, a camshaft and a brake base plate. One end of the brake shoe is pivoted to the brake base plate through a support pin, and the other end is provided with a roller that cooperates with the S-shaped cam on the camshaft. When the camshaft drives the S-shaped cam to rotate, the rollers of the two brake shoes are squeezed, so that the other ends of the two camshafts swing to both sides respectively, and the friction plate on the outside of the brake shoe contacts and cooperates with the inner surface of the brake drum, and the friction between the friction plate on the brake shoe and the brake drum is used to form a braking force.

[0003] The brake shoe generally includes a wing plate, a web fixed on the inner side of the wing plate, a friction plate connected to the outer side of the wing plate, a support pin installed at one end of the web to enable the brake shoe to pivot with the brake base plate, and a roller installed at the other end of the web through a retaining frame. During vehicle driving, the brake shoe vibrates with the vehicle chassis, which can easily cause the retaining frame and the web to loosen, causing the roller and the S-shaped cam to fail to cooperate, resulting in safety hazards. Utility Model Content

[0004] In view of the deficiencies in the prior art, the first object of the utility model is to provide a brake shoe, which can effectively prevent the retaining frame and the web from loosening due to vibration, thereby increasing the safety of the vehicle.

[0005] The second purpose of the utility model is to provide a drum brake.

[0006] In order to achieve the above purpose one, the utility model adopts the following technical solution:

[0007] The brake shoe comprises a wing plate, two web plates fixed to the inner side of the wing plate and arranged opposite to each other, a friction plate fixedly connected to the outer side of the wing plate, a retaining frame, and a roller;

[0008] The retaining frame includes two opposite side walls, which are respectively located on the inner sides of the two webs. The side walls and the corresponding webs are connected by a connecting piece that runs across the two side walls, and an elastic piece is arranged between the two side walls. The elastic piece is used to squeeze the side walls toward the webs corresponding to the side walls so that the side walls are tightly attached to the webs. A rotating shaft is passed through the two side walls, and the roller is rotatably sleeved on the rotating shaft. The two ends of the rotating shaft form shaft heads that protrude from the outer sides of the two side walls respectively, and the two shaft heads are respectively embedded in recesses arranged at the ends of the two webs.

[0009] The brake shoe includes a connecting bolt, which crosses the two webs and the retaining frame. The connecting bolt is connected to the corresponding side walls and webs to form a connecting piece. The nut of the connecting bolt abuts against the outer side of one of the webs, and the connecting bolt is threaded with a nut that abuts against the outer side of the other web.

[0010] The elastic member is a spring sleeved on the connecting bolt, the spring is located between the two side walls, and two ends of the spring are respectively pressed against the two side walls.

[0011] The elastic member is an elastic rubber sleeve sleeved on the connecting bolt, the elastic rubber sleeve is located between the two side walls, and two ends of the elastic rubber sleeve are respectively pressed against the two side walls.

[0012] The diameter of the shaft head is smaller than the diameter of the rotating shaft to form a limiting end surface at the position where the shaft head and the rotating shaft are connected. The two side walls are respectively sleeved on the two shaft heads, and the inner side surfaces of the two side walls are respectively abutted against the two limiting end surfaces.

[0013] An axial hole is respectively arranged on the two side walls, and two axial heads are respectively connected to the axial holes of the two side walls, and the parts of the axial heads protruding from the outer side surfaces of the side walls are embedded in the concave positions of the webs.

[0014] The brake shoe includes a pivot assembly, a mounting hole is provided at one end of the web away from the recessed position, the pivot assembly includes a pivot, a fixing bolt, and two baffles, the two ends of the pivot are respectively connected to the mounting holes of the two webs, the pivot is provided with a through hole extending from one end to the other end, the fixing bolt is connected to the through hole, the two baffles are both sleeved on the fixing bolt and are respectively located at the two ends of the pivot, a fixing nut is threaded on the fixing bolt, the fixing nut and the nut of the fixing bolt are respectively pressed on the outer sides of the two baffles so that the two baffles are respectively pressed on the two end surfaces of the pivot, and the outer edge of the baffle protrudes from the edge of the end surface of the pivot.

[0015] A gasket is arranged on the outer side surface of the web and surrounds the outer periphery of the mounting hole, and the two ends of the pivot are respectively protruded from the outer side surfaces of the two gaskets.

[0016] In order to achieve the above-mentioned second purpose, the utility model adopts the following technical solutions:

[0017] The drum brake comprises a camshaft, a brake base plate, and two brake shoes. The two brake shoes are arranged opposite to each other, one end of the brake shoe away from the roller is pivotally connected to the brake base plate, and the S-shaped cam of the camshaft is located between the rollers of the two brake shoes.

[0018] The beneficial effects of the utility model are:

[0019] In the utility model, the two side walls of the retaining frame are placed on the inner sides of the two webs, and the side walls of the retaining frame are pressed against the webs by the elastic stress provided by the elastic member, so that the side walls are always pressed against the webs, and the side walls can always connect the rotating shaft to the two webs. The shaft head at the end of the rotating shaft is clamped by the concave position at the end of the web, which can effectively prevent the retaining frame and the webs from loosening due to the vibration of the vehicle chassis during the driving of the vehicle, thereby improving the safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the brake shoe of the utility model;

[0021] Figure 2 It is a cross-sectional view of the brake shoe retainer of the utility model;

[0022] Figure 3 It is a cross-sectional view of the brake shoe pivot assembly of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the drum brake of the utility model. DETAILED DESCRIPTION

[0024] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0025] like Figure 1 , 23, a brake shoe of the utility model is shown, which includes a wing plate 10, two web plates 20, a retainer 30, and a roller 40, wherein the wing plate 10 is an arc with a middle portion convex outward, the web plate 20 is strip-shaped and matches the shape of the wing plate 10, the two web plates 20 are fixedly connected to the inner side surface of the wing plate 10 and are arranged oppositely, and a friction plate 11 is fixedly connected to the outer side surface of the wing plate 10. The retainer 30 is used to install the roller 40 to the ends of the two web plates 20, and specifically includes two opposite side walls 31 and a rotating shaft 32, and the two side walls 31 are respectively located at the two The inner side of the web 20 makes the two side walls 31 correspond to the two webs 20 respectively, and the two side walls 31 and the two webs 20 are connected by a connecting bolt 50 that passes through them. Specifically, the connecting bolt 50 has the outer side of one of the webs 20 and passes through one of the webs 20, one of the side walls 31, the other side wall 31 and the other web 20 in sequence. A nut 51 is screwed on the connecting bolt 50, and the nut 52 of the connecting bolt 50 abuts against the outer side surface of one of the webs 20. The nut 51 is tightened to press the nut 51 against the outer side surface of the other web 20. An elastic member is provided between the two side walls 31, and the two ends of the elastic member are respectively pressed against the two side walls 31, so that the two side walls 31 are respectively pressed toward the webs 20 corresponding to the side walls 31 by the elastic member, and then the side walls 31 are tightly attached to the inner side surfaces of the webs 20 corresponding to them. The rotating shaft 32 is connected between the two side walls 31, and the roller 40 is sleeved on the rotating shaft 32; a shaft head 321 is formed at each end of the rotating shaft 32, and the shaft head 321 protrudes from the outer side surface of the side wall 31, and the part of the shaft head 321 protruding from the outer side surface of the side wall 31 is embedded in the concave position 21 provided at the end of the corresponding web 20, that is, Specifically, the shaft heads 321 at both ends of the rotating shaft 32 pass through the two side walls 31 and are embedded in the two recessed positions 21 at the ends of the two webs 20. During assembly, the roller 40 is pre-mounted on the rotating shaft 32, and then the rotating shaft 32 is installed between the two side walls 31, so that the shaft heads 321 protrude from the outer side surfaces of the side walls 31, so that the two side walls 31 and the rotating shaft 32 form a retaining frame, and then the retaining frame is placed between the two webs 20, so that the bolt holes on the side walls 31 are aligned with the bolt holes on the web 20, and the two shaft heads 321 are respectively embedded in the recessed positions 21 at the ends of the two webs 20, and after the connecting bolts 50 are passed across, the nuts 51 are tightened.

[0026] In the utility model, the two side walls of the retaining frame are placed on the inner sides of the two webs, and the side walls of the retaining frame are pressed against the webs by the elastic stress provided by the elastic member, so that the side walls are always pressed against the webs, and the side walls can always connect the rotating shaft to the two webs. The shaft head at the end of the rotating shaft is clamped by the concave position at the end of the web, which can effectively prevent the retaining frame and the webs from loosening due to the vibration of the vehicle chassis during the driving of the vehicle, thereby improving the safety of the vehicle.

[0027] The utility model uses the above-mentioned connecting bolts 50 to cross the two webs 20 and the two side walls 31, and uses the connecting bolts 50 to cross the two groups of webs 20 and the side walls 31, so that the retaining frame 30 is fixed between the two webs 20. In other embodiments, the webs 20 and the corresponding side walls 31 can be connected by a connecting piece that crosses the two, that is, the webs 20 and the side walls 31 are respectively connected by a connecting piece, and the connecting piece can be a connecting pin or bolt that crosses the webs 20 and the side walls 31.

[0028] In a preferred embodiment, the elastic member may be a spring 60, which may be sleeved on the connecting bolt 50, and the spring 60 is located between the two side walls 31, so that the two ends of the spring 60 respectively abut against the inner side surfaces of the two side walls 31, and then the outer side surfaces of the two side walls 31 are closely attached to the inner side surfaces of the web 20, and the elastic stress of the spring 60 is used to press the side walls 31 and the web 20 to prevent the side walls 31 and the web 20 from being loosened due to the vibration of the vehicle chassis. During assembly, the retainer 30 is placed between the two webs, the spring 60 is placed between the two side walls 31, and the connecting bolt passes through the web 20, the side wall 31, and the spring 60. In other embodiments, the elastic member may also be an elastic rubber sleeve, which is placed between the two side walls 31 and sleeved on the connecting bolt 50, and the two ends of the elastic rubber sleeve respectively abut against the inner surface of the two side walls 31 to press the two side walls 31 against the inner side surfaces of the two webs 20.

[0029] In the present invention, the diameter of the shaft head 321 is smaller than the diameter of the rotating shaft 32, thereby forming a limiting end face 322 at the position where the rotating shaft 32 and the shaft head 321 are connected, and the two side walls 31 are respectively sleeved on the two shaft heads 321, and the inner side surfaces of the side walls 31 are abutted against the limiting end faces 322. The limiting end faces 322 are used to limit the side walls 31, so that a clearance fit is formed between the side walls 31 and the end faces of the rollers 40, avoiding interference between the side walls 31 and the rollers 40, so that the rollers 40 can maintain flexible rotation relative to the rotating shaft 32.

[0030] An axial hole is provided on each of the two side walls 31 , and two axial heads 321 are respectively connected to the axial holes of the two side walls 321 , and the parts of the axial heads 321 protruding from the outer side of the side wall 31 are embedded in the recessed positions 21 provided at the ends of the web 20 .

[0031] The brake shoe of the present invention also includes a pivot assembly, which is used to connect the two webs 20 to the brake bottom plate of the brake. A mounting hole 22 is provided at one end of the web 20 away from the recess 21. The pivot assembly includes a pivot 90, a fixing bolt 92, and two baffles 91. The two ends of the pivot 90 are respectively connected to the mounting holes 22 of the two webs 20. A through hole extending from one end to the other end is provided on the pivot 90. The fixing bolt 92 is inserted into the through hole from one end of the through hole. The two baffles 91 are both sleeved on the fixing bolt 92 and are respectively located at the pivot. At both ends of the pivot 90, a fixing nut 93 is screwed on the fixing bolt 92. After the fixing nut 93 is tightened, the fixing nut 93 and the nut 921 of the fixing bolt 92 are respectively pressed against the outer sides of the two baffles 91, thereby pressing the two baffles 91 against the two end surfaces of the pivot 90 respectively. The outer diameter of the baffle 91 is larger than the outer diameter of the pivot 90, so that the outer edge of the baffle 91 protrudes from the edge of the end surface of the pivot 90. The part of the baffle 91 protruding from the edge of the end surface of the pivot 90 forms a stopper, thereby preventing the entire pivot assembly from being separated from the mounting holes 22 of the two webs 20. A gasket 23 is provided on the outer side surface of the web 20. The gasket 23 is arranged around the periphery of the mounting hole 22. The two ends of the pivot 90 protrude from the outer side surfaces of the two gaskets 23 respectively. By providing the gasket 23, the circumferential dimension of the web 20 at the joint with the pivot 90 is increased, so that the pivot 90 can stably rotate relative to the web 20.

[0032] like Figure 4 As shown, the drum brake of the utility model comprises two brake shoes, a camshaft 80, and a brake base plate 70. The two brake shoes are arranged opposite to each other, and one end of the two brake shoes away from the roller 40 is pivotally connected to the brake base plate 70. The S-shaped cam 81 of the camshaft 80 is located between the rollers of the two brake shoes. The other structures of the drum brake are the same as those of the prior art and will not be described in detail here.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. Brake shoe, characterized in that: It includes a wing plate, two web plates fixed to the inner side of the wing plate and arranged opposite to each other, a friction plate fixedly connected to the outer side of the wing plate, a retaining frame, and a roller; The retaining frame includes two opposite side walls, which are respectively located on the inner sides of the two webs. The side walls and the corresponding webs are connected by a connecting piece that runs across the two side walls, and an elastic piece is arranged between the two side walls. The elastic piece is used to squeeze the side walls toward the webs corresponding to the side walls so that the side walls are tightly attached to the webs. A rotating shaft is passed through the two side walls, and the roller is rotatably sleeved on the rotating shaft. The two ends of the rotating shaft form shaft heads that protrude from the outer sides of the two side walls respectively, and the two shaft heads are respectively embedded in recesses arranged at the ends of the two webs.

2. The brake shoe according to claim 1, characterized in that: The brake shoe includes a connecting bolt, which crosses the two webs and the retaining frame. The connecting bolt is connected to the corresponding side walls and webs to form a connecting piece. The nut of the connecting bolt abuts against the outer side of one of the webs, and the connecting bolt is threaded with a nut that abuts against the outer side of the other web.

3. The brake shoe according to claim 2, characterized in that: The elastic member is a spring sleeved on the connecting bolt, the spring is located between the two side walls, and two ends of the spring are respectively pressed against the two side walls.

4. The brake shoe according to claim 2, characterized in that: The elastic member is an elastic rubber sleeve sleeved on the connecting bolt, the elastic rubber sleeve is located between the two side walls, and two ends of the elastic rubber sleeve are respectively pressed against the two side walls.

5. The brake shoe according to claim 1, characterized in that: The diameter of the shaft head is smaller than the diameter of the rotating shaft to form a limiting end surface at the position where the shaft head and the rotating shaft are connected. The two side walls are respectively sleeved on the two shaft heads, and the inner side surfaces of the two side walls are respectively abutted against the two limiting end surfaces.

6. The brake shoe according to claim 5, characterized in that: An axial hole is respectively arranged on the two side walls, and two axial heads are respectively connected to the axial holes of the two side walls, and the parts of the axial heads protruding from the outer side surfaces of the side walls are embedded in the concave positions of the webs.

7. The brake shoe according to claim 1, characterized in that: The brake shoe includes a pivot assembly, a mounting hole is provided at one end of the web away from the recessed position, the pivot assembly includes a pivot, a fixing bolt, and two baffles, the two ends of the pivot are respectively connected to the mounting holes of the two webs, the pivot is provided with a through hole extending from one end to the other end, the fixing bolt is connected to the through hole, the two baffles are both sleeved on the fixing bolt and are respectively located at the two ends of the pivot, a fixing nut is threaded on the fixing bolt, the fixing nut and the nut of the fixing bolt are respectively pressed on the outer sides of the two baffles so that the two baffles are respectively pressed on the two end surfaces of the pivot, and the outer edge of the baffle protrudes from the edge of the end surface of the pivot.

8. The brake shoe according to claim 7, characterized in that: A gasket is arranged on the outer side surface of the web and surrounds the outer periphery of the mounting hole, and the two ends of the pivot are respectively protruded from the outer side surfaces of the two gaskets.

9. A drum brake, characterized in that: It comprises a camshaft, a brake base plate, and two brake shoes according to any one of claims 1 to 8, wherein the two brake shoes are arranged opposite to each other, one end of the brake shoe away from the roller is pivotally connected to the brake base plate, and the S-shaped cam of the camshaft is located between the rollers of the two brake shoes.

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