A new type of automobile disc brake device

Abstract

The object of the present invention is to provide a novel automobile disc brake device, which comprises a brake disc, front and rear brake pads, a brake assembly, a brake mounting bracket, a brake caliper, and a brake wheel cylinder, wherein the brake assembly comprises a brake adjustment shaft, a manual hexagonal cap is provided at the front end of the adjustment pump, an automatic adjustment body is provided in the middle of the adjustment shaft, and a main wedge-shaped brake pad is provided on the threaded shaft at the rear end of the adjustment shaft. During braking, the main wedge-shaped brake pad is wedged between two brake rollers at the lower part of the brake piston, causing the brake piston to move upward and downward in the piston hole. The wedge-shaped brake pads provided on the tops of the two pistons are simultaneously wedged between the brake rollers provided at both ends of the front brake pads and the brake rollers on the brake caliper, forming an expansion braking force. The front brake pads and the rear brake pads provided on the brake caliper, one front and one rear, clamping the braking force to brake the rotating brake disc, thereby ensuring an effective braking function and enabling the vehicle to slow down or stop in time during driving. The technology has the advantages of integrated manual and automatic working functions, easy maintenance, good braking effect, and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brake system disc brakes, in particular to a novel automobile disc brake device. Background Art

[0002] In the existing automobile braking system, there are two common braking methods for medium and large trucks: drum brakes and disc brakes. The drum brake technology device is mainly composed of brake cylinders, adjustment arms, camshafts, brake shoes, brake drums and other components. China's domestic medium and large trucks mainly use drum brake technology. Disc brake technology devices have been widely used in the automotive field. Small vehicles use hydraulic disc brake technology. European OEMs have been using pneumatic disc brakes on medium and large trucks since the 1990s. In recent years, major Chinese automobile manufacturers have begun to introduce pneumatic disc brakes in batches for use on medium and large trucks. Disc brake technology devices are mainly composed of brake air pressure cylinders, brake discs, front and rear brake pads, brake calipers, brake assemblies and other components. The rear brake pads are set at the rear end of the brake caliper. There are two types of brake components. One is a hydraulic piston type, which is mainly used on small vehicles, and the other is a pneumatic brake piston type, which is mainly assembled Used on medium and large trucks, both brake assemblies have the function of automatically adjusting the brake clearance. A specific expansion space is set between the front brake pad and the brake caliper, and the brake assembly is set in this space. When braking starts, the brake air pressure cylinder pushes the brake piston set in the middle of the brake assembly to generate braking force to transmit to the front and rear ends. The front brake pad moves forward to generate braking pressure, and the brake caliper drives the rear brake pad to move backward to generate braking pressure, gradually clamping the rotating brake disc to form braking, so that the vehicle can slow down or stop in time. The disc brake technical device should have both manual and automatic braking functions, easy maintenance, long service life, and should conform to China's national conditions. Summary of the Invention

[0003] The object of the present invention is achieved by the following measures. The novel disc brake technical device is composed of the following parts: a brake disc (1), a rear brake pad (2), a front brake pad (3), a brake assembly (4), a brake mounting bracket (5), a brake caliper (6), a brake roller (7) arranged on the front brake pad, a return spring (8), a screw hole for manually adjusting a sealing ring cover (9), a manual hexagonal cap (10) arranged on a brake adjustment shaft, a brake wheel cylinder push rod (11), a locking bolt (12), a brake piston (13), a wedge-shaped brake pad (14), a brake roller (15) arranged on the brake caliper, a brake assembly bolt (16), a manual positioning bolt (17), and a manual positioning spring (18). The brake adjustment shaft comprises a manual positioning steel ball (19), a front ratchet tooth seat (20) arranged on the brake adjustment shaft, a rear ratchet tooth seat (21), an adjustment spring (22), a brake housing (23), a brake roller (24) arranged on the piston, a main wedge-shaped brake block (25) arranged in the square hole of the brake housing, a rigid piston sealing ring (26), a brake adjustment shaft (27), a rotating thread (28) arranged between the brake adjustment shaft and the main wedge-shaped brake block, an ear shaft (29) arranged at both ends of the rear ratchet tooth seat, a rolling wheel sleeve (30) arranged on the ear shaft, a rotating inclined groove (31) arranged on the automatic adjustment body, a positioning hole (32), an automatic adjustment body (33), and a straight groove (34) arranged on the automatic adjustment body. This technical device is arranged in sequence from front to back on a central axis: a brake cylinder push rod, a manual adjustment hexagonal cap is provided at the front end of the brake adjustment shaft, and a front ratchet gear seat is not provided on the brake adjustment shaft. A rotating thread is provided in the middle hole of the rear end of the brake adjustment shaft and the main wedge-shaped brake block, and the automatic adjustment body is arranged in the circular hole of the brake housing and can rotate left and right in the hole. A rear ratchet gear seat is provided at the front end of the automatic adjustment body, and the teeth on the rear ratchet gear seat match the teeth on the front ratchet gear seat of the brake adjustment shaft to form a one-way working surface. An ear shaft is provided on the center line of both ends of the rear ratchet gear seat, and a rolling wheel sleeve is provided on the ear shaft. The rear ratchet gear seat is assembled in the circular hole at the front end of the automatic adjustment body, and the two ear shafts and the rolling wheel sleeve are respectively arranged on the left and right sides of the automatic adjustment body. An adjustment spring is provided at the rear end of the rear ratchet tooth seat in the straight groove of the automatic adjustment body. Equal positioning holes are provided at the rear end of the automatic adjustment body. The locking bolt provided on the brake housing is loosened and disengaged from the positioning holes. The automatic adjustment body is in manual debugging working state. When the adjustment shaft is rotated left or right, the manual positioning steel ball overcomes the pressure of the manual positioning spring, rolls out of the positioning hole and rolls into the next positioning hole. When the brake adjustment shaft is rotated manually counterclockwise, the main wedge-shaped brake block is driven by the rotating thread to move backward, forming a brake. At this time, the brake clearance is zero. Conversely, when the brake adjustment shaft is rotated manually clockwise, the main wedge-shaped brake block moves forward, releasing the brake. The manual positioning steel ball jumps over the positioning holes 3-4, and the brake clearance is 0.4-0.7 mm, the manual debugging work is completed, the locking bolt is tightened, the automatic adjustment body and the brake housing are integrated, and the brake assembly enters the automatic adjustment working state. When the brake cylinder push rod generates braking thrust and moves backward, all the components arranged on the brake adjustment shaft move backward at the same time. Since the main wedge brake block is set at a certain oblique angle front and rear, the main wedge brake block moves backward and wedges into the middle of the brake rollers on the upper and lower pistons, moving the brake pistons up and down, and the wedge brake blocks arranged on the upper parts of the upper and lower pistons simultaneously wedge into the brake rollers on the front brake pads and the rear brake rollers arranged on the brake caliper. The front brake pads and the rear brake pads arranged on the brake caliper, the front and rear clamping forces form braking on the rotating brake disc. When the brake clearance is in normal conditions, the distance the brake adjustment shaft moves backward is short, and the left and right ear shafts and the rolling wheel sleeve on the rear ratchet tooth seat fail to enter the rotating oblique groove of the automatic adjustment body, and move forward and backward in the straight groove in front of the rotating oblique groove. When the brake clearance is greater than When the brake clearance is normal, the brake adjustment shaft moves rearward for an extended distance. The left and right trunnions and rolling wheel sleeves enter their respective rotating bevel slots in the automatic adjustment body. The rear ratchet teeth begin to rotate clockwise, compressing the adjustment springs and moving them backward. Simultaneously, the teeth on the two teeth begin to separate, moving from the bottom of the teeth to the top of the teeth, and then returning to the next tooth over the top of the teeth. When braking is complete, the brake adjustment shaft moves forward, and the adjustment springs push the rear ratchet teeth out of the automatic adjustment body. The left and right trunnions and rolling wheel sleeves rotate counterclockwise out of the rotating bevel slots. Because the front and rear ratchet teeth are one-way working surfaces, the brake adjustment shaft rotates counterclockwise simultaneously. The rotational force of the brake adjustment shaft threads causes the main wedge brake pad to move backward, automatically adjusting the brake clearance. The rotating bevel slots on the left and right ends of the automatic adjustment body are straight slots in the front and rotating bevel slots in the rear. The left rotating bevel slot is set at an upward angle, while the right rotating bevel slot is set at a downward angle. A rigid piston sealing ring is installed in the brake piston hole of the brake housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1 This is a schematic diagram showing the structural arrangement of the main components of a novel automobile disc brake device of the present invention.

[0005] Figure 2 The present invention relates to a novel automobile disc brake device, comprising a brake caliper (6), a brake roller (7) arranged on a front brake pad, a rear brake pad (2), a brake disc (1), a front brake pad (3), a return spring (8), a screw hole for a manual adjustment sealing cover (9), a manual hexagonal cap (10) arranged on a brake adjustment shaft, a brake wheel cylinder push rod (11), a locking bolt (12), and a top view schematic diagram of the main components and structures.

[0006] Figure 3The present invention relates to a novel automobile disc brake device, comprising a brake piston (13), a wedge-shaped brake block (14), a brake roller (15) arranged on a brake caliper, a brake mounting bracket (5), a brake assembly bolt (16), a manual positioning bolt (17), a manual positioning spring (18), a manual positioning steel ball (19), a front ratchet tooth seat (20) arranged on a brake adjustment shaft, a rear ratchet tooth seat (21), an adjustment spring (22), a locking bolt (12), and a schematic cross-sectional assembly diagram of the main component structures.

[0007] Figure 4 The invention relates to a novel steam disc brake device, comprising a brake housing (23), a brake roller (24) arranged on a piston, a main wedge-shaped brake block (25) arranged in a square hole of the brake housing, a rigid piston sealing ring (26), a brake adjustment shaft (27), a rotating thread (28) arranged between the brake adjustment shaft and the main wedge-shaped brake block, and the main wedge-shaped brake block gradually and automatically adjusts the brake clearance backward to the final limit, at which time a new brake friction lining needs to be replaced.

[0008] Figure 5 The present invention relates to a novel automobile disc brake device, comprising a brake mounting bracket (5), a brake housing (23), a main wedge-shaped brake block (25) arranged in a square hole of the brake housing, a brake adjustment shaft (27), a brake assembly bolt (16), a wedge-shaped brake block (14), a brake piston (13), a rotating thread (28) arranged between the brake adjustment shaft and the main wedge-shaped brake block, and an AA cross-sectional structure showing an assembly intention.

[0009] Figure 6 The present invention relates to a novel automobile disc brake device, including a side view schematic diagram of a brake adjustment shaft (27) and a front ratchet tooth seat (20) arranged on the brake adjustment shaft, a side view of a rear ratchet tooth seat (21), an ear shaft (29) arranged at both ends of the rear ratchet tooth seat, and a rolling wheel sleeve (30), an adjustment spring (22), a rotating inclined groove (31) arranged on an automatic adjustment body, a positioning hole (32), an automatic adjustment body (33), a straight groove (34) arranged on the automatic adjustment body, a manually adjustable hexagonal cap (10), and a side view cross-sectional schematic diagram.

[0010] Figure 7The present invention is a novel automobile disc brake device. When the brake adjustment shaft (27) is subjected to braking force and moves backward for an extended distance, the front ratchet tooth seat (20), the rear ratchet tooth seat (21), and the adjustment spring (22) arranged at the front end of the automatic adjustment body (33) are all pressed into the circular hole of the automatic adjustment body (33). At the same time, the two ear shafts (29) and the rolling wheel sleeve (30) at both ends of the rear ratchet tooth seat (21) are also pressed into the rotating inclined groove (31) of the automatic adjustment body. During the rotation, the teeth of the two tooth seats of the rear ratchet tooth seat (21) begin to separate and produce a tooth jumping action. The schematic diagram of the work is enlarged. The → arrow shows the braking direction. DETAILED DESCRIPTION

[0011] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical aspects of the present invention, but the present invention is not limited to these examples.

[0012] like Figure 1 ..... Figure 7As shown, the present invention is a novel automobile disc brake device. This embodiment is designed for large buses, medium and large trucks and is described in detail. When the disc brake assembly (4) is installed in the brake system, it is fixed to the mounting bracket (5) by the brake assembly bolt (16). The technical device is arranged in sequence from front to back on a central axis: a brake cylinder push rod (11), a brake adjustment shaft (27), a manual adjustment hexagonal cap (10) is provided at the front end of the brake adjustment shaft, and a front ratchet gear seat is also provided on the brake adjustment shaft. (20), a rotating thread (28) is provided in the middle hole between the rear end of the brake adjustment shaft and the main wedge-shaped brake block (25). Since the main wedge-shaped brake block (25) is provided in the square hole of the brake housing, when the brake adjustment shaft rotates left or right, the main wedge-shaped brake block moves forward and backward in the square hole. The automatic adjustment body (33) is provided in the circular hole of the brake housing (23) and can rotate left or right in the circular hole. A rear ratchet tooth seat (21) is provided at the front end of the automatic adjustment body. The teeth on the rear ratchet tooth seat are aligned with the teeth on the front ratchet tooth seat of the brake adjustment shaft. The teeth of the rear ratchet tooth seat are matched to form a one-way working surface. A trunnion (29) is provided on the center line of both ends of the rear ratchet tooth seat. A rolling wheel sleeve (30) is provided on the trunnion. The rear ratchet tooth seat is assembled in the straight groove (34) of the automatic adjustment body. An adjustment spring (22) is provided at the rear end of the rear ratchet tooth seat. Equal positioning holes (32) are provided on the outer circle of the rear end of the automatic adjustment body. The locking bolt (12) provided on the brake housing (23) is loosened and disengaged from the fixed hole. The automatic adjustment body is in a manual debugging working state. When the brake adjustment shaft is rotated left and right, the brake adjustment shaft is adjusted to the left and right. The manual positioning steel ball (19) overcomes the pressure of the manual positioning spring (18), rolls out of the positioning hole and rolls to the next positioning hole. At this time, there is a "click" and "click" sound. When the brake adjustment shaft is manually rotated counterclockwise, the main wedge-shaped brake block is pushed by the rotating thread to move backward in the square hole of the brake housing, forming a brake. At this time, the brake clearance is zero. On the contrary, when the brake adjustment shaft is manually rotated clockwise, the main wedge-shaped brake block moves forward, releasing the brake, and the manual positioning steel ball jumps over the positioning hole 3--4, and the brake clearance is reduced by 0.4--0.7 mm, the manual debugging work is completed, the locking bolt is tightened, and the automatic adjustment body and the brake housing are integrated, and the disc brake enters the automatic adjustment working state. When the brake cylinder push rod generates a braking thrust and moves from front to back, all the parts set on the brake adjustment shaft enter the braking working state at the same time. Since the main wedge-shaped brake block is set at a certain oblique angle front and back, the main wedge-shaped brake block is wedged backward into the brake rollers (24) on the two pistons, and the brake piston (13) moves in the upward and downward directions. The wedge-shaped brake blocks (14) set on the top of the upper and lower pistons are wedged into the middle of the brake roller (7) on the front brake pad (3) and the brake roller (15) set on the brake caliper (6), forming an expansion brake. The front brake pad and the rear brake pad (2) arranged on the brake caliper, the front and rear clamping braking force form a brake on the rotating brake disc (1) to ensure an effective braking function, so that the vehicle can slow down or stop in time during driving, and the return spring (8) arranged on the top of the wedge-shaped brake pad is also compressed. When the brake clearance is in a normal state, the distance the brake adjustment axis moves backward is short. At this time, the left and right ear shafts and the rolling wheel sleeve on the rear ratchet tooth seat move forward and backward in the straight groove in front of the rotating inclined groove. When the brake clearance is greater than the normal brake clearance, the distance the brake adjustment axis moves backward is extended, and the left and right ear shafts and the rolling wheel sleeve enter the respective rotating inclined grooves (31) of the automatic adjustment body. The ratchet teeth seat begins to rotate clockwise, the adjustment spring moves backward and is compressed, and at the same time the teeth on the two teeth seats begin to separate, moving from the bottom of the tooth to the top of the tooth, and returning to the next tooth over the top of the tooth. When the braking is over, the brake adjustment shaft moves forward and the braking thrust is released. The rotating thread braking pressure between the brake adjustment pump and the main wedge-shaped brake block is in a relaxed state. The adjustment spring forcibly ejects the rear ratchet teeth seat from the automatic adjustment body. Since the front and rear ratchet teeth seats are unidirectional working surfaces, the brake adjustment shaft rotates counterclockwise at the same time. Affected by the rotational force of the brake adjustment shaft thread, the main wedge-shaped brake block moves backward in the square hole of the brake housing. At the same time, the upper and lower brake pistons and wedge-shaped brake blocks move in the upward and downward directions to restore normal Braking clearance: When the vehicle has traveled a certain number of kilometers and the front and rear brake pads have worn to the safety line, the main wedge-shaped brake pads of the disc brake automatic adjustment mechanism have reached their limit of backward movement and need to be replaced with new front and rear brake pads. At this time, the locking bolts should be loosened and separated from the positioning holes. The manual hexagonal cap should be adjusted with a wrench. The brake adjustment shaft should be rotated clockwise to pull the main wedge-shaped brake pads from the back to the front to the adjustment zero position. The old front and rear brake pads should be removed and the new front and rear brake pads should be installed in the brake system. The brake adjustment shaft should be adjusted with a wrench. At this time, a new round of manual adjustment phase begins. A rigid piston sealing ring (26) should be set in the brake piston hole of the brake housing to ensure the cleanliness of the inside of the brake housing when the disc brake generates high temperature during braking.

[0013] The specific embodiments described herein are merely examples of the spirit of the invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways, but they will not deviate from the spirit of the invention or exceed the scope defined by the appended claims.

[0014] Although this article uses more of the following, brake disc (1), rear brake pad (2), front brake pad (3), brake assembly (4), brake mounting bracket (5), brake caliper (6), brake roller (7) arranged on the front brake pad, return spring (8), manual adjustment ring cover screw hole (9), manual hexagonal cap (10) arranged on the brake adjustment shaft, brake wheel cylinder push rod (11), locking bolt (12), brake piston (13), wedge-shaped brake pad (14), brake roller (15) arranged on the brake caliper, brake assembly bolt (16), manual positioning bolt (17), manual positioning spring (18), manual positioning steel ball (19), front ratchet tooth seat (20) arranged on the brake adjustment shaft, rear ratchet tooth seat (21), adjustment spring (22) , brake housing (23), a brake roller (24) arranged on the piston, a main wedge-shaped brake block (25) arranged in the square hole of the brake housing, a rigid piston sealing ring (26), a brake adjustment shaft (27), a rotating thread (28) arranged between the brake adjustment shaft and the main wedge-shaped brake block, an ear shaft (29) arranged at both ends of the rear ratchet tooth seat, a rolling wheel sleeve (30) arranged on the ear shaft, a rotating inclined groove (31) arranged on the automatic adjustment body, a positioning hole (32), an automatic adjustment body (33), a straight groove (34) arranged on the automatic adjustment body, etc., but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention: interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A new type of automobile disc brake device, characterized by: The invention is composed of the following parts: a brake disc (1), a rear brake pad (2), a front brake pad (3), a brake assembly (4), a brake mounting bracket (5), a brake caliper (6), a brake roller (7) arranged on the front brake pad, a return spring (8), a manual adjustment ring cover screw hole (9) arranged on the brake caliper, a manual hexagonal cap (10) arranged on the brake adjustment shaft, a brake wheel cylinder push rod (11), a locking bolt (12), a brake piston (13), a first wedge-shaped brake pad (14), a brake roller (15) arranged on the brake caliper, a brake assembly bolt (16), a manual positioning bolt (17), a manual positioning spring (18), a manual positioning steel ball ( 19), a front ratchet tooth seat (20) arranged on the brake adjustment shaft, a rear ratchet tooth seat (21), an adjustment spring (22), a brake housing (23), a brake roller (24) arranged on the piston, a main wedge-shaped brake block (25) arranged in the square hole of the brake housing, a rigid piston sealing ring (26), a brake adjustment shaft (27), a rotating thread (28) arranged between the brake adjustment shaft and the main wedge-shaped brake block, an ear shaft (29) arranged at both ends of the rear ratchet tooth seat, a rolling wheel sleeve (30) arranged on the ear shaft, a rotating inclined groove (31) arranged on the automatic adjustment body, a positioning hole (32), the automatic adjustment body (33), and a straight groove (34) arranged on the automatic adjustment body; The return spring is arranged on the top of the first wedge-shaped brake block; When the brake assembly (4) is installed in the brake system, the brake assembly (4) is fixed to the mounting bracket (5) by the brake assembly bolts (16); A manual positioning bolt (17) is provided on the brake caliper (6); The novel automobile disc brake device is arranged in sequence from front to back on a central axis, and the brake cylinder push rod and the front end of the brake adjustment shaft are provided with a manually adjustable hexagonal cap. A front ratchet tooth seat is also provided on the brake adjustment shaft. A rotating thread is provided in the middle hole of the rear end of the brake adjustment shaft and the main wedge-shaped brake block. The automatic adjustment body is arranged in the circular hole of the brake housing and can rotate left and right in the hole. A rear ratchet tooth seat is provided at the front end of the automatic adjustment body. The teeth on the rear ratchet tooth seat match the teeth on the front ratchet tooth seat of the brake adjustment shaft to form a one-way working surface. Ear shafts are provided on the center lines of the two ends of the rear ratchet tooth seat, and a rolling wheel sleeve is provided on the ear shaft. The rear ratchet tooth seat is assembled in the circular hole at the front end of the automatic adjustment body. The two ear shafts and the rolling wheel sleeve are divided into left and right Set in the straight groove of the automatic adjustment body, an adjustment spring is set at the rear end of the rear ratchet tooth seat, and the rear end of the automatic adjustment body is set with equally divided positioning holes. The locking bolt set on the brake housing is loosened and disengaged from the positioning hole. The automatic adjustment body is in manual debugging working state. When the adjustment shaft is rotated left and right, the manual positioning steel ball overcomes the pressure of the manual positioning spring, rolls out of the positioning hole and rolls into the next positioning hole. When the brake adjustment shaft is manually rotated counterclockwise, the main wedge-shaped brake block is driven by the rotating thread to move backward, forming a brake. At this time, the brake clearance is zero. Conversely, when the brake adjustment shaft is manually rotated clockwise, the main wedge-shaped brake block moves forward, releasing the brake, and the manual positioning steel ball jumps over the positioning hole 3--4 holes, with a brake clearance of 0.4--0.7 mm, the manual debugging work is completed, the locking bolt is tightened, and the automatic adjustment body and the brake housing are integrated, and the brake assembly enters the automatic adjustment working state. When the brake cylinder push rod generates a braking thrust and moves backward, all the components set on the brake adjustment shaft move backward at the same time. Since the main wedge-shaped brake block is set at a certain angle front and back, the main wedge-shaped brake block moves backward and wedges into the middle of the brake rollers on the upper and lower pistons, moving the brake pistons in the upward and downward directions, and the first wedge-shaped brake block (14) set on the upper part of the upper and lower pistons simultaneously wedges into the brake roller on the front brake pad and the brake roller set on the brake caliper. The front brake pad and the rear brake pad set on the brake caliper, the front and rear clamping forces form a brake on the rotating brake disc. When the brake clearance is in normal condition, the distance the brake adjustment shaft moves backward is short, and the left and right ear shafts and the rolling wheel sleeve on the rear ratchet tooth seat fail to enter the rotating inclined groove of the automatic adjustment body, and move forward and backward in the straight groove in front of the rotating inclined groove. When the brake clearance is normal, the distance the brake adjustment shaft moves backward is short, and the left and right ear shafts and the rolling wheel sleeve on the rear ratchet tooth seat fail to enter the rotating inclined groove of the automatic adjustment body, and move forward and backward in the straight groove in front of the rotating inclined groove. When the brake clearance is greater than the normal brake clearance, the rear movement distance of the brake adjustment shaft is extended, and the left and right ear shafts and the rolling wheel sleeve enter the respective rotating bevel grooves of the automatic adjustment body. The rear ratchet tooth seat begins to rotate clockwise, and the adjustment spring moves backward and is compressed. At the same time, the teeth on the two tooth seats begin to separate, 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. When the braking is completed, the brake adjustment shaft moves forward, and the adjustment spring pushes the rear ratchet tooth seat out of the automatic adjustment body, and the left and right ear shafts and the rolling wheel sleeve rotate out of the rotating bevel groove counterclockwise. Since the front and rear ratchet tooth seats are unidirectional working surfaces, the brake adjustment shaft rotates counterclockwise at the same time. Under the influence of the rotation force of the brake adjustment shaft thread, the main wedge brake block moves backward to automatically adjust the brake clearance. The rotating bevel grooves set at the left and right ends of the automatic adjustment body are set as a straight groove in the front and a rotating bevel groove in the rear. The angle of the left rotating bevel groove is set upward, and the angle of the right rotating bevel groove is set downward. A rigid piston sealing ring is set in the brake piston hole of the brake housing. .

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