Gap adjusting mechanism of air pressure disc brake

Abstract

The utility model provides a clearance adjusting mechanism of an air pressure disc brake, and belongs to the technical field of brakes. The problem of abnormal sound caused by eccentric wear is solved. The device comprises a supporting seat, two adjusting sleeves, two adjusting screws and a pressing plate, two through holes are formed in the pressing plate in the axial direction of the adjusting screws, the pressing plate is connected to the outer ends of the two adjusting screws in a sleeved mode, and two anti-rotation bosses are arranged on the inner side face of the pressing plate in a protruding mode around each through hole. The two anti-rotation bosses abut against the outer portions of the corresponding adjusting screw rods so that the adjusting screw rods and the pressing plate can be fixed in the circumferential direction, the inner side face of the pressing plate is further provided with two positioning bosses in a protruding mode around each through hole, and the two positioning bosses abut against the outer portions of the corresponding adjusting screw rods. The two positioning bosses and the two anti-rotation bosses which are arranged around the same through hole are distributed on the periphery of the corresponding adjusting screw rod, and an anti-abrasion gap is formed between the outer side face of the outer end of the adjusting screw rod and the hole wall of the through hole where the adjusting screw rod penetrates. The device has the advantages of effectively preventing eccentric wear, eliminating abnormal sound and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to brake technical field relates to the gap adjusting mechanism of air pressure disc brake. BACKGROUND

[0002] Air pressure disc brake is a kind of brake that is more common in current middle and high-grade commercial vehicles, two brake pads in brake are respectively arranged at the two sides of brake disc, and after two brake blocks are respectively pressed on brake disc, braking is realized by friction. After long time use, brake pad will be worn and cause the gap (that is brake gap) between brake pad and brake disc to become larger, which will prolong the preparation time during braking, so gap adjusting mechanism is integrated in the existing air pressure disc brake to realize automatic adjustment of brake gap.

[0003] For example, the air pressure disc brake assisting mechanism disclosed in patent application No. 201721349683.7 includes a pressure arm assembly, a gap adjusting assembly, a supporting pressure seat, a return spring, a bottom plate and a pressing plate. The gap adjusting assembly is provided with two sets, which are left and right gap adjusting assemblies, respectively, and are arranged on the left and right sides of the pressure arm assembly. The gap adjusting assembly includes an adjusting sleeve, a rotating torsion spring, a clutch torsion spring, an adjusting sleeve pipe, an adjusting screw and an adjusting gear. The adjusting sleeve is sleeved on the adjusting sleeve pipe, the lower end of the adjusting sleeve pipe is fixedly sleeved with the adjusting gear, the clutch torsion spring is sleeved on the upper end of the adjusting sleeve pipe, the rotating torsion spring is sleeved outside the clutch torsion spring and located in the adjusting sleeve, the upper end of the adjusting screw extends into the adjusting sleeve pipe and is threadedly connected therewith, and the lower end of the adjusting screw passes through the through hole of the floor and is clamped on the pressing plate. In the description of the drawings in the specification Figure 3 It can be seen that the pressing plate is provided with two through holes, and the pressing plate is sleeved on one end of the two adjusting screws through the two through holes. The outer diameter of the adjusting screw is matched with the inner diameter of the through hole, so that the center position of the pressing plate is determined. When the adjusting sleeve rotates to drive the adjusting screw to move, the adjusting screw is required to be limited from rotating. As shown in the description of the drawings in the specification Figure 1 It can be seen that the adjusting screw is actually clamped by the two bosses on the pressing plate and cannot rotate (the number of adjusting screws is two, and each adjusting screw is clamped by two bosses). After the brake gap becomes larger, the two adjusting sleeve pipes will rotate and drive the adjusting screws threadedly connected therewith to move synchronously, so that the two adjusting screws will move with the pressing plate, so that the pressing plate pushes the brake pad to move towards the brake disc to reduce the gap between them.

[0004] However, in the process of braking, the brake disc is gradually locked by two brake pads using friction in the process of rotation, that is, the brake disc will generate a circumferential force on the brake pad, and the brake pad will transmit the force to the pressing plate, which has a force along the width direction of the pressing plate and a force along the length direction of the pressing plate, so that the pressing plate has a deflection tendency under the action of the force. Although the pressing plate has two bosses and the adjusting screw is clamped together to bear the force along the width direction of the pressing plate (from its description Figure 1 It can be seen that the two bosses are arranged along the width direction of the pressing plate), but the force along the length direction of the pressing plate is completely borne by the outer wall of the through hole and the outer wall of the outer end of the adjusting screw, so that the inner wall of the through hole will gradually wear after a long time of use, thereby causing the center position of the pressing plate to be no longer fixed, that is, the pressing plate will move along its length direction, thereby causing abnormal noise. Utility model content

[0005] The utility model discloses a gap adjusting mechanism of air pressure disc brake, which solves the problem of abnormal noise caused by wear.

[0006] The utility model discloses a gap adjusting mechanism of air pressure disc brake, which solves the problem of abnormal noise caused by wear.

[0007] The utility model discloses a gap adjusting mechanism of air pressure disc brake, which solves the problem of abnormal noise caused by wear.

[0008] The utility model discloses a gap adjusting mechanism of air pressure disc brake, which solves the problem of abnormal noise caused by wear.

[0009] The clearance adjusting mechanism of the air pressure disc brake is provided with two anti-rotation bosses around each through hole on the pressing plate, and two positioning bosses are additionally provided around each through hole, and the two positioning bosses also abut against the side of the corresponding adjusting screw, so that the two anti-rotation bosses and the two positioning bosses arranged around the same through hole are distributed around the corresponding adjusting screw, and meanwhile, there is an anti-wear gap between the outer side surface of the outer end of the adjusting screw and the hole wall of the through hole, so that the two anti-rotation bosses and the two positioning bosses are combined to replace the through hole to center the pressing plate, the through hole only plays a sleeving role, and the positioning boss is obviously less likely to be worn than the hole wall of the through hole, so that the pressing plate can be prevented from being eccentrically worn, and abnormal noise caused by eccentric wear is eliminated.

[0010] In the above-mentioned clearance adjusting mechanism of the air pressure disc brake, each positioning boss has a circular arc positioning surface, and the circular arc positioning surfaces of the two positioning bosses arranged around the same through hole are concentrically arranged and abut against the outer peripheral wall of the corresponding adjusting screw.

[0011] In the above-mentioned clearance adjusting mechanism of the air pressure disc brake, as another technical solution, each positioning boss has a positioning flat surface, and the side of the adjusting screw is provided with two limiting flat surfaces, and the positioning flat surfaces of the two positioning bosses arranged around the same through hole abut against the two limiting flat surfaces of the corresponding adjusting screw.

[0012] On the basis of the two anti-rotation bosses, whether the circular arc positioning surface is arranged on the positioning boss and abuts against the outer peripheral wall of the corresponding adjusting screw, or the positioning flat surface is arranged on the positioning boss and the limiting flat surface is arranged on the side of the adjusting screw and the positioning flat surface abuts against the limiting flat surface, the positioning flat surface can replace the through hole to center the pressing plate.

[0013] In the above-mentioned clearance adjusting mechanism of the air pressure disc brake, the outer side surface of the pressing plate has a first recess corresponding to the position of the anti-rotation boss, and the shape of the first recess is the same as that of the anti-rotation boss.

[0014] The first recess is arranged to make the weight of the entire pressing plate lighter, so that the weight of the pressing plate is not excessively increased due to the arrangement of the anti-rotation boss. In practice, the anti-rotation boss is directly extruded from the outer side surface of the pressing plate to the inner side surface, and the first recess is naturally formed after the anti-rotation boss is extruded.

[0015] In the above-mentioned clearance adjusting mechanism of the air pressure disc brake, the outer side surface of the pressing plate has a second recess corresponding to the position of the positioning boss, and the shape of the second recess is the same as that of the positioning boss.

[0016] The second recess is arranged so that the weight of the whole pressing plate can be made lighter, so that the weight of the pressing plate will not be increased too much because of the arrangement of the positioning boss. In practice, the positioning boss is directly extruded from the outer side of the pressing plate to the inner side, and the second recess is naturally formed after the positioning boss is extruded.

[0017] In the gap adjusting mechanism of the air pressure disc brake, the adjusting screw comprises a connecting section, a limiting section and a sleeve joint in sequence, the connecting section has external threads, the limiting section has an outer diameter larger than both the connecting section and the sleeve joint, the limiting section further has two matching planes on its side, the two anti-rotation bosses arranged around the same through hole are each provided with an anti-rotation plane, the two anti-rotation planes are respectively in abutment with the two matching planes of the corresponding adjusting screw, the through hole is a stepped hole, the sleeve joint extends into the larger part of the through hole via the smaller part of the through hole, the sleeve joint in the larger part of the through hole is externally connected with a check ring, and the pressing plate is positioned between the limiting section and the check ring along the axial direction of the adjusting screw.

[0018] In the gap adjusting mechanism of the air pressure disc brake, the sleeve joint in the larger part of the through hole is further externally sleeved with a wave spring washer, and the wave spring washer is in abutment between the transition position of the hole wall of the through hole and the check ring.

[0019] The sleeve joint in the larger part of the through hole is externally sleeved with a wave spring washer, and the wave spring washer is in abutment between the transition position of the hole wall of the through hole and the check ring. Because the position of the check ring is fixed, the elastic force of the wave spring washer will act on the pressing plate, thereby eliminating the axial play gap between the pressing plate and the adjusting screw due to machining errors, so that the pressing plate will not shake and make noise when the vehicle bumps.

[0020] Compared with the prior art, the gap adjusting mechanism of the air pressure disc brake is provided with two positioning bosses around each through hole on the basis of the two anti-rotation bosses around each through hole, and the two positioning bosses are also in abutment with the side of the corresponding adjusting screw, so that the two anti-rotation bosses and the two positioning bosses arranged around the same through hole are distributed around the corresponding adjusting screw, and the anti-wear gap between the outer side of the outer end of the adjusting screw and the hole wall of the through hole is also provided, so that the two anti-rotation bosses and the two positioning bosses are combined to replace the through hole to center the pressing plate, so that the through hole only serves as a sleeve, and the positioning boss is obviously less likely to be worn than the hole wall of the through hole, thereby preventing the pressing plate from being worn and eliminating abnormal noise caused by the uneven wear of the pressing plate. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the gap adjusting mechanism of the air pressure disc brake.

[0022] Figure 2 is Figure 1 is a sectional view along A-A in Fig.

[0023] Figure 3 is a partial exploded view of the two adjusting screws and the pressing plate.

[0024] Figure 4 is another partial exploded view of the two adjusting screws and the pressing plate from another angle.

[0025] Figure 5 is a sectional view between the two adjusting screws and the pressing plate in Example 2 (the sectional view is along the same direction as 2).

[0026] In the figure, 1 is a support seat; 2 is an adjusting sleeve; 3 is an adjusting screw; 3a is a connecting section; 3b is a limiting section; 3b1 is a matching plane; 3b2 is a limiting plane; 3c is a sleeve joint; 4 is a pressing plate; 4a is a through hole; 4b is an anti-rotation boss; 4b1 is an anti-rotation plane; 4c is a positioning boss; 4c1 is a centering arc surface; 4c2 is a positioning plane; 4d is a first recess; 4e is a second recess; 5 is a gear one; 6 is a gear two; 7 is an anti-wear gap; 8 is a check ring; and 9 is a wave spring washer. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings, but the present application is not limited to these embodiments.

[0028] Example 1

[0029] As Figure 1As shown, the gap adjusting mechanism of the air disc brake comprises a supporting seat 1, two adjusting sleeves 2, two adjusting screws 3 and a pressing plate 4. The two adjusting sleeves 2 are parallelly arranged in the supporting seat 1 and fixed with the supporting seat 1 in the axial direction. The two adjusting screws 3 are respectively threadedly connected in the two adjusting sleeves 2, and the outer ends of the two adjusting screws 3 respectively extend out of the adjusting sleeves 2. The pressing plate 4 is connected with the outer ends of the two adjusting screws 3. Specifically, the outer ends of the two adjusting sleeves 2 respectively extend out of the supporting seat 1, and the outer ends of the two adjusting sleeves 2 are respectively sleeved with a gear one 5. The gear one 5 is fixed with the corresponding adjusting sleeve 2. The supporting seat 1 is sleeved with a gear two 6, and the gear two 6 is rotatable relative to the supporting seat 1. The gear two 6 is engaged between the two gears one 5. In practice, one of the adjusting sleeves 2 is a driving adjusting sleeve 2 receiving driving force, and the other adjusting sleeve 2 is a driven adjusting sleeve 2. When the gap adjusting mechanism of the air disc brake works, the driving adjusting sleeve 2 receives driving force to rotate. The gear one 5 fixed with the driving adjusting sleeve 2 transmits power to the gear one 5 fixed with the driven adjusting sleeve 2 through the gear two 6, so that the driven adjusting sleeve 2 rotates in the same direction as the driving adjusting sleeve 2. Since the pressing plate 4 is circumferentially fixed with the two adjusting screws 3 by the two anti-rotation bosses 4b around the through holes 4a, the pressing plate 4 limits the rotation of the two adjusting screws 3. Thus, the two adjusting screws 3 respectively extend out of the adjusting sleeves 2 along the threads and push the brake pad to the brake disc through the pressing plate 4 to reduce the gap between the brake pad and the brake disc.

[0030] Specifically, as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the pressing plate 4 is provided with two through holes 4a along the axial direction of the adjusting screw 3, and the pressing plate 4 is sleeved on the outer end of each adjusting screw 3 through the two through holes 4a, and the pressing plate 4 is fixed with the adjusting screw 3 along the axial direction. The inner side of the pressing plate 4 is provided with two anti-rotation bosses 4b around each through hole 4a, and the two anti-rotation bosses 4b abut against the corresponding adjusting screw 3 to form circumferential fixation of the adjusting screw 3 and the pressing plate 4. Because the adjusting screw 3 and the pressing plate 4 are circumferentially fixed, the adjusting screw 3 will move along the thread when the adjusting sleeve 2 rotates. The outer diameter of the outer end of the adjusting screw 3 is smaller than the hole diameter of the through hole 4a, and there is an anti-wear gap 7 between the outer side of the outer end of the adjusting screw 3 and the hole wall of the through hole 4a. The inner side of the pressing plate 4 is also provided with two positioning bosses 4c around each through hole 4a, and the two positioning bosses 4c abut against the corresponding adjusting screw 3. The two positioning bosses 4c and the two anti-rotation bosses 4b around the same through hole 4a are distributed around the corresponding adjusting screw 3. Each positioning boss 4c has a centering arc surface 4c1, and the centering arc surfaces 4c1 of the two positioning bosses 4c around the same through hole 4a are concentrically arranged and abut against the outer peripheral wall of the corresponding adjusting screw 3.

[0031] When the vehicle brakes, the entire support seat 1 is pressed against the brake disc so that the brake pad abutting against the pressing plate 4 is in contact with the brake disc, and finally the brake disc is locked under the action of friction. In this process, the brake disc will generate a force on the brake pad along the circumferential direction of the brake disc, and the brake pad will transmit the force to the pressing plate 4 to make the pressing plate 4 have a deflection tendency. The gap adjusting mechanism is provided with two anti-rotation bosses 4b around each through hole 4a on the pressing plate 4, and two positioning bosses 4c are additionally provided around each through hole 4a, and the two positioning bosses 4c also abut against the side of the corresponding adjusting screw 3, so that the two anti-rotation bosses 4b and the positioning bosses 4c around the same through hole 4a are distributed around the corresponding adjusting screw 3, which is equivalent to using the combination of the two anti-rotation bosses 4b and the two positioning bosses 4c to replace the through hole 4a to center the pressing plate 3, and the positioning boss 4c is obviously more difficult to be worn than the hole wall of the through hole 4a, thereby preventing the pressing plate 4 from being deflected and eliminating the abnormal noise caused by the deflection of the pressing plate 4.

[0032] As shown in FIG. 1, Figure 2 , Figure 3 and Figure 4As shown, the pressing plate 4 is arc-shaped, two anti-rotation bosses 4b arranged around the same through hole 4a are arranged in the width direction of the pressing plate 4 and oppositely arranged, and two positioning bosses 4c arranged around the same through hole 4a are arranged in the length direction of the pressing plate 4 and oppositely arranged. The outer side surface of the pressing plate 4 has a first recess 4d corresponding to the position of the anti-rotation boss 4b, and the shape of the first recess 4d is the same as that of the anti-rotation boss 4b. The first recess 4d is arranged so that the weight of the entire pressing plate 4 can be lighter, so that the weight of the pressing plate 4 is not excessively increased due to the arrangement of the anti-rotation boss 4b. In practice, the anti-rotation boss 4b is directly extruded from the outer side surface of the pressing plate 4 to the inner side surface direction, and the first recess 4d is naturally formed after the anti-rotation boss 4b is extruded. The outer side surface of the pressing plate 4 has a second recess 4e corresponding to the position of the positioning boss 4c, and the shape of the second recess 4e is the same as that of the positioning boss 4c. The second recess 4e is arranged so that the weight of the entire pressing plate 4 can be lighter, so that the weight of the pressing plate 4 is not excessively increased due to the arrangement of the positioning boss 4c. In practice, the positioning boss 4c is directly extruded from the outer side surface of the pressing plate 4 to the inner side surface direction, and the second recess 4e is naturally formed after the positioning boss 4c is extruded.

[0033] In the present embodiment, as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the adjusting screw 3 includes a connecting section 3a, a limiting section 3b and a sleeve joint 3c in sequence along the axial direction, the connecting section 3a has external threads, the adjusting screw 3 is threadedly connected in the adjusting sleeve 2 through the connecting section 3a, the limiting section 3b has an outer diameter which is larger than both the connecting section 3a and the sleeve joint 3c, the pressing plate 4 is sleeved outside the sleeve joint 3c, two anti-rotation bosses 4b and two positioning bosses 4c which are arranged around the same through hole 4a are both matched with the limiting section 3b, specifically, two matched planes 3b1 are symmetrically arranged outside the limiting section 3b, the two anti-rotation bosses 4b which are arranged around the same through hole 4a are both provided with anti-rotation planes 4b1 and the two anti-rotation planes 4b1 are respectively abutted against the two matched planes 3b1 outside the limiting section 3b of the corresponding adjusting screw 3, and the arc centering surfaces of the two positioning bosses 4c which are arranged around the same through hole 4a are abutted against the outer peripheral wall of the limiting section 3b. The through hole 4a is a stepped hole, the sleeve joint 3c extends into the part with larger hole diameter of the through hole 4a through the part with smaller hole diameter of the through hole 4a, both the smaller hole diameter and the larger hole diameter of the through hole 4a are larger than the outer diameter of the sleeve joint 3c, the sleeve joint 3c outside the part with larger hole diameter of the through hole 4a is connected with a check ring 8, and the pressing plate 4 is positioned between the limiting section 3b and the check ring 8 along the axial direction of the adjusting screw 3. The sleeve joint 3c outside the part with larger hole diameter of the through hole 4a is further sleeved with a wave spring washer 9, and the wave spring washer 9 is abutted between the hole wall transition position of the through hole 4a and the check ring 8. Because the position of the check ring 8 is fixed, the elastic force of the wave spring washer 9 will completely act on the pressing plate 4, thereby eliminating the axial play gap between the pressing plate 4 and the adjusting screw 3 due to machining errors, so that the pressing plate 4 will not shake and make noise when the vehicle bumps.

[0034] Embodiment Two

[0035] The structure and principle of the embodiment are basically the same as those of Embodiment One, and the difference lies in that, in the embodiment, as shown, Figure 5 each positioning boss 4c has a positioning plane 4c2, and the side of the limiting section 3b of the adjusting screw 3 is provided with two limiting planes 3b2, and the positioning plane 4c2 of each positioning boss 4c which is arranged around the same through hole 4a is abutted against the corresponding limiting plane 3b2 of the adjusting screw 3.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. The gap adjusting mechanism of air pressure disc brake, comprising a support base (1), two adjusting sleeves (2) which are parallel and are arranged in the support base (1), two adjusting screws (3) which are respectively screwed in the adjusting sleeves (2), and a pressing plate (4) which is provided with two through holes (4a) along the axial direction of the adjusting screws (3), the pressing plate (4) is respectively sleeved on the outer end of the adjusting screws (3) through the two through holes (4a), the pressing plate (4) is fixed with the adjusting screws (3) along the axial direction, the inner side of the pressing plate (4) is respectively provided with two anti-rotation bosses (4b) which are protruded around each through hole (4a), the two anti-rotation bosses (4b) are abutted against the corresponding adjusting screws (3) to make the adjusting screws (3) and the pressing plate (4) form circumferential fixation, characterized in that, The inner side of the pressing plate (4) is further provided with two positioning bosses (4c) around each through hole (4a), and the two positioning bosses (4c) abut against the outer of the corresponding adjusting screw (3). The two positioning bosses (4c) and the two anti-rotation bosses (4b) around the same through hole (4a) are distributed around the corresponding adjusting screw (3). The outer side of the outer end of the adjusting screw (3) has an anti-wear gap (7) between the hole wall of the through hole (4a) passed through.

2. The gap adjusting mechanism of a pneumatic disc brake according to claim 1, characterized by Each positioning boss (4c) has a centering arc surface (4c1), and the centering arc surfaces (4c1) of the two positioning bosses (4c) around the same through hole (4a) are concentrically arranged and abut against the outer peripheral wall of the corresponding adjusting screw (3).

3. The gap adjusting mechanism of a pneumatic disc brake according to claim 1, wherein Each positioning boss (4c) has a positioning plane (4c2), and the side of the adjusting screw (3) is provided with two limiting planes (3b2). The positioning planes (4c2) of the two positioning bosses (4c) around the same through hole (4a) abut against the two limiting planes (3b2) of the corresponding adjusting screw (3) respectively.

4. The gap adjusting mechanism of a pneumatic disc brake according to claim 2 or 3, characterized in that The outer side of the pressing plate (4) has a first recess (4d) corresponding to the position of the anti-rotation boss (4b). The shape of the first recess (4d) is the same as that of the anti-rotation boss (4b).

5. The gap adjusting mechanism of a pneumatic disc brake according to claim 2 or 3, characterized in that The outer side of the pressing plate (4) has a second recess (4e) corresponding to the position of the positioning boss (4c). The shape of the second recess (4e) is the same as that of the positioning boss (4c).

6. The gap adjusting mechanism of a pneumatic disc brake according to claim 2 or 3, characterized in that The adjusting screw (3) sequentially comprises a connecting section (3a), a limiting section (3b), and a socket joint (3c). The connecting section (3a) has an external thread. The outer diameter of the limiting section (3b) is greater than that of the connecting section (3a) and the socket joint (3c). The side of the limiting section (3b) is further provided with two matching planes (3b1). The two anti-rotation bosses (4b) around the same through hole (4a) are provided with anti-rotation planes (4b1), and the two anti-rotation planes (4b1) abut against the two matching planes (3b1) of the corresponding adjusting screw (3) respectively. The through hole (4a) is a stepped hole. The socket joint (3c) extends into the part with larger hole diameter of the through hole (4a) through the part with smaller hole diameter of the through hole (4a). The socket joint (3c) located in the part with larger hole diameter of the through hole (4a) is connected with a check ring (8) outside. The pressing plate (4) is positioned between the limiting section (3b) and the check ring (8) along the axial direction of the adjusting screw (3).

7. The gap adjusting mechanism of a pneumatic disc brake according to claim 6, characterized in that The socket joint (3c) located in the part with larger hole diameter of the through hole (4a) is further provided with a wave spring washer (9) outside. The wave spring washer (9) abuts between the hole wall transition position of the through hole (4a) and the check ring (8).

Images