A new type of automobile brake clearance adjustment arm device

Abstract

This invention discloses a novel automotive brake clearance adjusting arm device, comprising an adjusting arm housing, a ratchet, a ratchet block, a forward adjusting rod, a reverse adjusting rod, a return spring, a push-opening structure, a forward large gear, and a forward small gear. The adjusting arm housing has a ratchet hole and a groove on its inner top. The ratchet is rotatably mounted in the ratchet hole and is driven by the camshaft. The reverse adjusting rod is rotatably connected inside the adjusting arm housing. The push-opening ratchet teeth are fixed on the reverse adjusting rod. The ratchet block has an elliptical hole, and the push-opening ratchet teeth are located within the elliptical hole. Multiple ratchet teeth are provided at the bottom of the ratchet block and mesh with the ratchet teeth of the ratchet. A groove is provided on the inner side of the adjusting arm housing, and the return spring is fixed within the groove, with its bottom end abutting against the ratchet block. The forward adjusting rod rotates inside the adjusting arm housing, and a forward small gear is connected to it. One end of the ratchet has a forward large gear, and the forward small gear is driven by the forward large gear.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile brakes, and in particular relates to a novel automobile brake clearance adjusting arm device. Background Art

[0002] In the existing drum brake system of large automobiles, public buses, and freight trucks, the main function of the adjustment arm is to transmit the braking thrust generated by the brake cylinder to the camshaft. The camshaft opens the upper and lower brake shoes, and the friction plates on the two brake shoes generate braking friction with the brake drum to ensure timely deceleration and parking. At the same time, the adjustment arm should timely adjust the standard 0.3-0.6mm brake clearance between the friction plate and the brake drum. The existing adjustment arm technical device is mainly composed of a worm gear and a worm mechanism. The adjustment arm transmits the braking torque and is responsible for the braking and returning functions. This requires the worm gear and worm mechanism inside the housing to be self-locking during the braking process, that is, when braking, the brake adjustment arm can be quickly moved to form a brake. When the brake is finished, the brake adjustment arm can be quickly returned to release the brake. At the same time, according to the wear of the brake friction plate, the adjustment arm mechanism adjusts the brake clearance. This device should also have a high service life and safety to avoid frequent replacement. Prevent friction loss from causing excessive friction clearance and brake failure.

[0003] The service life of the automobile brake adjustment arm in the prior art is short, and the worm gear and worm mechanism inside it often fail to self-lock, and the reverse rotation force generated directly damages the main components of the adjustment arm, resulting in changes in the original assembly dimensions of the worm gear and worm. The adjustment arm itself has too much freedom, which makes the vehicle slow down or stop in time during braking, and cannot return to its original position after braking. This poses a hidden danger of driving unsafe, so the components need to be replaced frequently. The self-locking failure is mainly caused by the following factors: the adjustment arm is mainly composed of a housing, a worm gear, a worm and a worm shaft, and the teeth of the worm gear and the worm are The module, pitch circle diameter and spiral pressure angle are all the same. During the overlapping assembly process, an oblique assembly gap with a spiral pressure angle of 5° is formed. After the assembly is completed, there is only one tooth contact surface. When the car brakes, due to the frequent reciprocating braking impact force of the worm on the worm wheel, the oblique angle between the two causes the worm wheel to exert a reverse thrust on the worm, causing the adjustment worm shaft to rotate backward. This reverse rotation force forms a friction intersection with the forward rotation force generated by the adjustment mechanism, causing varying degrees of damage to the worm wheel teeth and worm teeth in a very short time, resulting in a short service life and an increase in the internal clearance of the adjustment arm, resulting in brake failure.

[0004] Therefore, how to provide a new type of automobile brake clearance adjustment arm device with long service life, reliable braking and strong impact resistance is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a novel automobile brake clearance adjustment arm device, which has a long service life, strong impact resistance, can achieve rapid braking and return, has reliable and stable adjustment, high sensitivity and strong safety.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a novel automobile brake clearance adjustment arm device, which includes an adjustment arm housing, a ratchet gear, a ratchet block, a ratchet, a forward adjustment rod, a reverse adjustment rod, a return spring, a top opening structure, a forward large gear and a forward small gear, the adjustment arm housing is provided with a ratchet gear hole, the ratchet gear is rotatably installed in the ratchet gear hole, and the ratchet gear is transmission-connected to the camshaft through the camshaft spline teeth; a groove is provided inside the adjustment arm housing corresponding to the ratchet gear hole above the ratchet gear hole, the ratchet gear The block slides up and down in the groove, the ratchet block is provided with a top-opening structure assembly hole that passes through the two side walls, the bottom of the ratchet block is provided with a plurality of ratchets that mesh with the plurality of ratchets on the ratchet gear; the top-opening structure is any one of a top-opening ratchet tooth and a double-headed cam block, the top-opening structure assembly hole is any one of an elliptical hole and a special-shaped hole, the top-opening ratchet tooth is rotatably located in the elliptical hole, the triangular protrusion is fixed on the top of the elliptical hole, the top-opening ratchet tooth abuts and cooperates with the triangular protrusion, and the double-headed cam block is rotatably located in the special-shaped hole;

[0007] The reverse adjustment rod is rotatably connected in the adjustment arm housing and is horizontally located above the ratchet gear; the top-open ratchet teeth are fixedly connected to the reverse adjustment rod via spline teeth arranged on the reverse adjustment rod, the return spring is fixed in the groove above the ratchet block, the forward pinion is connected to the forward adjustment rod via an assembly spline, the forward gear is fixed on the ratchet gear and the forward gear is transmission-connected to the forward pinion; the forward and reverse directions in the text are defined for the braking direction of the braking system.

[0008] The axes of the reverse adjustment rod and the forward adjustment rod are arranged perpendicularly; one end of the forward adjustment rod and the reverse adjustment rod are both located outside the adjustment arm housing.

[0009] The beneficial effects of the present invention are as follows: a reverse adjusting rod and a forward adjusting rod are rotatably installed inside the adjusting arm housing, and a top-opening ratchet tooth is fixedly connected to the reverse adjusting rod by assembling a spline, an elliptical hole is provided on the ratchet block, and a triangular protrusion is provided on the top of the elliptical hole, and the top-opening ratchet tooth abuts and cooperates with the triangular protrusion, and the compression spring is located in the groove at the top of the ratchet block, and the ratchet teeth on the ratchet block cooperate with the ratchet teeth on the ratchet gear, and the function of the return spring is to apply a downward elastic force to make the ratchet gear mesh with the ratchet teeth on the ratchet block, and the forward adjusting rod rotates, and the forward small gear drives the forward large gear to rotate, and the ratchet gear rotates forward at the same time. When the ratchet gear rotates, the ratchet teeth on the ratchet gear push the ratchet teeth on the ratchet block upward, and the ratchet block moves upward in the groove, and cooperates with the function of the return spring to jump teeth one by one, and the protrusion The wheel axle starts to rotate in the braking direction, the brake shoe and the brake drum form a brake, and the forward adjustment is completed; when the reverse adjusting rod rotates, the open ratchet teeth set in the middle section of the reverse adjusting rod push the triangular protrusion upward, and the ratchet block moves upward. Pushed by the counter-braking force, the ratchet gear rotates in the opposite direction to jump one tooth, and the brake clearance is adjusted. Under the pressure of the return spring, the ratchet block quickly returns and locks, and the adjustment is completed. Since the ratchet gear and the ratchet block are meshed with multiple teeth and multiple teeth are stressed at the same time, rapid braking and rapid return can be achieved, and multiple teeth of the ratchet are stressed. Compared with the single-tooth contact surface contact during braking of traditional worm gear and worm mechanism, it has strong impact resistance and will not loosen, thereby extending the overall service life of the adjusting arm and further improving the sensitivity, reliability and safety of the brake system adjustment.

[0010] Preferably, the two ends of the return spring respectively abut against the top of the groove and the ratchet block; the ratchet teeth at the bottom of the ratchet block are helical teeth and are arranged to rotate at an angle of 30° to 80° in the forward direction, the ratchet teeth on the ratchet gear are helical teeth, and the ratchet teeth at the bottom of the ratchet block are correspondingly meshed with the ratchet teeth on the ratchet gear.

[0011] Preferably, an assembly square shaft is provided on the reverse adjustment rod, and the double-headed cam block is fixedly connected to the assembly square shaft. The double-headed cam block rotates and is located in the special-shaped hole. The double-headed cam block abuts and cooperates with the upper wall of the special-shaped hole, and the reverse rotation of the double-headed cam block drives the ratchet block to move upward in the groove.

[0012] Preferably, the triangular protrusion matches the tooth shape of the top ratchet teeth and is arranged at an angle of 40° to 110° in the opposite direction.

[0013] Preferably, one end of the reverse adjustment rod is located on the outside of the adjustment arm housing and is fixedly connected to a reverse adjustment hexagonal cap, and the reverse adjustment hexagonal cap rotates coaxially with the reverse adjustment rod; one end of the forward adjustment rod is located on the outside of the adjustment arm housing and is fixedly connected to a forward adjustment hexagonal cap, and the forward adjustment hexagonal cap rotates coaxially with the forward adjustment rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial cross-sectional schematic diagram of a novel automobile brake clearance adjustment arm device embodiment 1 of the present invention;

[0015] Figure 2 This is a cross-sectional view of a novel automobile brake clearance adjustment arm device according to the present invention taken along line AA;

[0016] Figure 3 This is a schematic diagram of a ratchet block and a top-opening structure of a novel automobile brake clearance adjustment arm device embodiment 1 of the present invention;

[0017] Figure 4 A schematic diagram of the transmission between the driving wheel and the driven wheel of a new type of automobile brake clearance adjustment arm device of the present invention Figure 1 ;

[0018] Figure 5 It is a partial cross-sectional schematic diagram of a second embodiment of a novel automobile brake clearance adjustment arm device of the present invention;

[0019] Figure 6 This is a schematic diagram of the ratchet block and top-opening structure of Example 2 of a novel automobile brake clearance adjusting arm device of the present invention.

[0020] 1 spline teeth, 2 reverse adjustment rod, 3 ratchet block, 4 ratchet, 5 ratchet gear, 6 camshaft spline teeth, 7 adjustment arm housing, 8 reverse adjustment hexagonal cap, 9 return spring, 10 adjustment arm brake connecting hole, 11 top ratchet teeth, 12 forward large gear, 13 forward small gear, 14 assembly spline, 15 forward adjustment hexagonal cap, 16 rivet, 17 cover plate, 18 triangular convex block, 19 elliptical hole, 20 assembly square shaft, 21 double-headed cam block, 22 special-shaped hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The arrow indicates the direction of rotation. The small gear and the large gear in this embodiment are relatively large and small gears.

[0022] Example 1

[0023] Type I device;

[0024] See the attached Figures 1 to 4, this embodiment is designed for large buses and heavy trucks. The embodiment of the present invention is a novel automobile brake clearance adjustment arm device, which includes a spline tooth 1 provided on a reverse adjustment rod, a reverse adjustment rod 2, a ratchet block 3, a ratchet 4, a ratchet gear 5, a camshaft spline tooth 6, an adjustment arm housing 7, a reverse adjustment hexagonal cap 8, a return spring 9, an adjustment arm brake connection hole 10, a top ratchet tooth 11 provided on the reverse adjustment rod, a forward large gear 12 provided at one end of the ratchet gear 5, and a forward small gear 13 provided on the forward adjustment rod and assembled by assembling a spline 14; a forward adjustment hexagonal cap 15 on the forward adjustment rod, and a cover plate 17 fixed on the forward adjustment rod by a rivet 16. On the adjusting arm housing 7, an elliptical hole is provided on the ratchet block, and a triangular protrusion 18 is fixed in the upper elliptical hole. The technical device is arranged on the center line of the adjusting arm housing 7, and a ratchet gear 5, a ratchet block 3 and a return spring 9 are arranged in sequence from bottom to top; the ratchet gear 5 is arranged in the ratchet gear hole of the adjusting arm housing 7, and the ratchet gear can rotate in the ratchet gear hole, the ratchet block 3 is arranged in the groove at the upper end of the ratchet gear 5, and the ratchet block 3 can move up and down in the groove, a ratchet 4 is arranged between the ratchet gear 5 and the ratchet block 3, the ratchet 4 is arranged with a height of 3.5 mm, the number of teeth arranged is 32, the right angle of the teeth is 90°, the bevel angle of the teeth is 60°, and the return spring 9 is arranged in the groove at the upper end of the ratchet block 3, In order to ensure the effective tooth jumping pressure of the ratchet block 3, the forward pinion 13 is assembled through the assembly spline 14 on the forward adjustment rod. The forward large gear 12 and the forward pinion 13 set on the ratchet gear 5 transmit the working torque through gear meshing. The forward pinion 13 is the driving gear. After the internal parts of the adjustment arm are assembled, the cover plate and the assembly rivets are pressed on the outside. The brake camshaft and the camshaft spline teeth 6 are assembled. When the adjustment arm assembly is installed in the brake system, the adjustment arm brake connection hole 10 is assembled with the brake cylinder push rod. The working procedure for debugging the brake clearance begins. The forward adjustment hexagonal cap 15, the forward pinion 13, and the forward large gear 1 are set. 2 and the ratchet gear 5, when debugging and rotating in the forward direction, since the ratchet 4 is set at a 60° bevel angle in the forward direction, the 60° bevel angle between the ratchet gear 5 and the ratchet block 3 pushes the ratchet block 3 upward, and the teeth of the two move from the bottom of the tooth to the top of the tooth and return to the next tooth over the top of the tooth, accompanied by a "click" and "click" sound image. The set return spring 9 is compressed at the same time, and a spring pressure of tooth-by-tooth jumping is generated on the ratchet block 3. The camshaft 6 starts to rotate in the braking direction and forms a brake, and the forward tightening is completed. At this time, the adjusting arm set in the braking system, the braking force and the counter-braking force are all concentrated on the 90° vertical plane on the ratchet block 3 and the ratchet 4 on the ratchet gear 5.

[0025] The reverse adjustment rod 2 and the top ratchet tooth 11 are assembled with the spline teeth 1, and the center of the side surface of the ratchet block 3 is set as an elliptical hole 19. The top ratchet tooth 11 is set in the elliptical hole 19. The upper end of the elliptical hole 19 is provided with a triangular protrusion 18. The tooth shape of the top ratchet tooth 11 matches the triangular protrusion 18, and is set at a reverse 90° angle. When the reverse adjustment hexagonal cap 8, the reverse adjustment rod 2, and the top ratchet tooth 11 are reversely rotated, the teeth on the top ratchet tooth 11 push the triangular protrusion 18 set at the upper end of the elliptical hole 19 upward during the rotation. At the same time, the ratchet teeth 4 on the ratchet block 3 begin to disengage from the ratchet teeth on the ratchet gear due to the upward movement. Driven by the counter-braking force, when the ratchet gear 5 is reversely rotated by one tooth, the ratchet block 3 quickly descends under the pressure of the pressure yellow 9 to lock the ratchet gear 5, and the braking clearance of the braking system is 0.5mm.

[0026] Example 2

[0027] Type II device;

[0028] according to Figure 5-6 , the following parts are respectively arranged, a reverse adjustment rod 2, a reverse adjustment hexagonal cap 8, an assembly square shaft 20 is arranged in the middle section of the reverse adjustment rod, a double-headed cam block 21, and a special-shaped hole 22 is arranged on the side of the ratchet block, the reverse adjustment rod 2 and the double-headed cam block 21 are assembled with the assembly square shaft, the double-headed cam block 21 is arranged in the special-shaped hole 22, and when the reverse adjustment hexagonal cap 8, the reverse adjustment rod 2, and the double-headed cam block 21 are reversely rotated, the double-headed cam block 21 rotates in the special-shaped hole 22 on the ratchet block 3, and the cam head gradually pushes the ratchet block 3 upward, and the cam head rotates 90° to push it upward to the highest point, and at the same time, the ratchet on the ratchet block 3 and the ratchet on the ratchet gear begin to disengage upward and disengage, and the cam head rotates 180° as a working unit. Driven by the counter-braking force, when the ratchet gear 5 is reversely rotated by one tooth, under the pressure of the return spring 9, the ratchet block 3 quickly descends to lock the ratchet gear 5, and the braking clearance of the braking system is 0.5mm.

[0029] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel automobile brake clearance adjustment arm device, comprising an adjustment arm housing, a ratchet gear, a ratchet block, a forward adjustment rod, a reverse adjustment rod, a return spring, a top-opening structure, a forward large gear and a forward small gear, wherein a ratchet gear hole is provided on the adjustment arm housing, the ratchet gear is rotatably installed in the ratchet gear hole, and the ratchet gear is connected to the camshaft through the camshaft spline teeth; a groove is provided above the ratchet gear hole in the interior of the adjustment arm housing, the ratchet block slides up and down in the groove, a top-opening structure assembly hole is provided on the ratchet block that passes through the two side walls, a plurality of ratchets are provided at the bottom of the ratchet block and mesh with the plurality of ratchets on the ratchet gear; the top-opening structure is any one of a top-opening ratchet tooth and a double-headed cam block, the top-opening structure assembly hole is any one of an elliptical hole and a special-shaped hole, the top-opening ratchet tooth is rotatably located in the elliptical hole, the triangular protrusion is fixed on the top of the elliptical hole, the top-opening ratchet tooth abuts and cooperates with the triangular protrusion, and the double-headed cam block is rotatably located in the special-shaped hole; The reverse adjusting rod and the forward adjusting rod are respectively rotatably connected in the adjusting arm housing and are horizontally located above the ratchet gear; the top-opening ratchet teeth are fixedly connected to the reverse adjusting rod through the spline teeth arranged on the reverse adjusting rod, the return spring is fixed in the groove above the ratchet block, and the two ends of the return spring are respectively abutted against the top of the groove and the ratchet block; the ratchet teeth at the bottom of the ratchet block are helical teeth, and are arranged to rotate at an angle of 30°~80° forward, the ratchet teeth on the ratchet gear are helical teeth, the ratchet teeth at the bottom of the ratchet block are correspondingly meshed with the ratchet teeth on the ratchet gear, the forward pinion is connected to the forward adjusting rod through an assembly spline, the forward large gear is fixed on the ratchet gear and the forward large gear is transmission connected to the forward pinion; an assembly square shaft is arranged on the reverse adjusting rod, the double-headed cam block is fixedly connected to the assembly square shaft, the double-headed cam block is rotatably located in the special-shaped hole, and the reverse rotation of the double-headed cam block drives the ratchet block to move up in the groove.

2. A novel automobile brake clearance adjustment arm device according to claim 1, characterized in that: The triangular protrusion matches the tooth shape of the top-open ratchet teeth and is set at an angle of 40° to 110° in the opposite direction.

3. A novel automobile brake clearance adjustment arm device according to claim 1, characterized in that: One end of the reverse adjustment rod is located on the outside of the adjustment arm housing and is fixedly connected to a reverse adjustment hexagonal cap, and the reverse adjustment hexagonal cap rotates coaxially with the reverse adjustment rod. One end of the forward adjustment rod is located on the outside of the adjustment arm housing and is fixedly connected to a forward adjustment hexagonal cap, and the forward adjustment hexagonal cap rotates coaxially with the forward adjustment rod.

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