A manual release mechanism for a brake chamber

Abstract

The utility model provides a kind of manual release mechanism of brake chamber belongs to braking technical field.It solves the problem of insufficient reliability.Brake chamber includes shell, upper skin film subassembly and execution rod subassembly, execution rod subassembly passes through upper skin film subassembly and is equipped with self-locking piece between the both after upper skin film subassembly is deformed upward, and the both are fixed, this manual release mechanism includes pull rope, the mounting seat of fixed connection in the upper end of execution rod subassembly, the connecting head being connected with pull rope, the push disc of being sleeved on execution rod subassembly and the reset spring being acted on the push disc upward, the two sides of mounting seat are respectively hinged with action rod, action rod is set along transverse and two ends are respectively connecting end and action end, the action end of two action rods is opposite, connecting rod is respectively hinged between the connecting end of two action rods and connecting head, the action end of two action rods is all abutted in push disc top, and self-locking piece abuts in push disc bottom when execution rod subassembly and upper skin film subassembly are fixed.It has improved work reliability and other advantages.

Description

Technical Field

[0001] This utility model belongs to the field of braking technology and relates to a manual release mechanism for a brake chamber. Background Technology

[0002] The brake chamber is an important component of the rail transit braking system. Its function is to convert the pressure of compressed air into the thrust that drives the brake in the braking system. For example, the parking chamber of the cable-operated basic braking device disclosed in patent application number 201911414049.0 includes a housing, an elastic actuator assembly slidably disposed within the housing for parking braking, and a guide sleeve that can move upward along the actuator assembly when inflated. The guide sleeve is provided with a self-locking component that can move along the guide sleeve and fix the upward-moving guide sleeve to the actuator assembly. It also includes a pull rope, a mounting base fixed to the upper end of the actuator assembly, and a sliding seat slidably connected to the mounting base. A swing arm is hinged to the side of the mounting base, and the lower end of the pull rope is connected to the swing arm. The device connects to and can drive one end of the swing arm to swing. The other end of the swing arm and the sliding seat are provided with meshing teeth that drive the sliding seat to descend when the swing arm swings. When the sliding seat slides downward relative to the mounting seat, it can push the self-locking component to move down and unlock. Specifically, the sliding seat is provided with a mating part, which is located on the same side of the mounting seat as the swing arm and on one side of the swing arm. The meshing teeth are provided between the mating part and the swing arm. A clearance hole is provided through the center of the sliding seat. The diameter of the clearance hole is larger than the outer diameter of the guide sleeve. When the guide sleeve is fixed to the actuator assembly, the lower end face of the sliding seat abuts against the self-locking component. When the parking brake needs to be manually released, the operator pulls the rope upwards. The lower end of the rope is connected to one end of the swing arm, causing the rope to pull one end of the swing arm upwards. This causes the other end of the swing arm to swing downwards, thus the swing arm applies a downward force to the sliding seat through the meshing teeth. The sliding seat slides downwards and pushes the self-locking component downwards to unlock. In this way, the guide sleeve disengages from the actuator assembly, allowing the actuator assembly to return to its pre-installation state under its own elastic force.

[0003] However, as is well known, due to machining errors and other reasons during manufacturing, it is impossible to guarantee that the meshing accuracy of the two teeth will reach the theoretical accuracy. This makes the meshing teeth prone to wear after long-term operation. If the wear is too great, it will seriously affect the effective meshing of the two teeth, resulting in the inability to transmit power stably and affecting the reliability of manually releasing the parking brake. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a manual release mechanism for the brake chamber, which solves the problem of insufficient reliability caused by the inability to effectively and stably transmit power over a long period of time.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A manual release mechanism for a brake chamber includes a housing, an upper diaphragm assembly with an outer ring fixed to the housing, and an elastic actuator assembly slidably disposed within the housing. The actuator assembly passes through the upper diaphragm assembly, and a self-locking element is provided between the two to fix them together after the upper diaphragm assembly deforms upward. The manual release mechanism includes a pull rope and a mounting base fixed to the upper end of the actuator assembly. The mechanism further includes a connector, a push plate, and a return spring. The connector is located above the mounting base and connected to the pull rope. The mounting base has two sides... Each rod is hinged with an actuating rod, which is arranged laterally with a connecting end and an actuating end at its two ends, respectively. The actuating rod can swing its actuating end downward around its hinge point with the mounting base. The actuating ends of the two actuating rods are opposite. The connecting ends of the two actuating rods are hinged to the connecting head, and the hinge points of the two connecting rods and the connecting head are collinear. The push plate is sleeved on the actuator rod assembly. The actuating ends of the two actuating rods directly or indirectly abut against the top of the push plate. The spring force of the return spring acts upward on the push plate. When the actuator rod assembly and the upper diaphragm assembly are fixed, the self-locking element abuts against the bottom of the push plate.

[0007] During parking brake preparation, air is inflated into the space beneath the upper diaphragm assembly. The actuator assembly remains stationary, while the upper diaphragm assembly deforms upwards and is secured by a self-locking mechanism, which rests against the bottom of the push plate. When parking brake is required, the air in the space beneath the upper diaphragm assembly is released. The upper diaphragm assembly, along with the actuator assembly, moves downwards. The actuator assembly extends out of the housing and actuates the brakes fixed to the bogie of the rail transit system. After braking, air is inflated again into the space beneath the upper diaphragm assembly, causing the upper diaphragm assembly and actuator assembly to move upwards back to the parking brake preparation state.

[0008] When a vehicle malfunctions or other reasons prevent the parking brake from being released by venting the air in the space below the upper diaphragm assembly, manual release of the parking brake is required. In this case, the operator pulls the cable upwards. The cable, through the connector, pulls the two linkages upwards, causing the hinged ends of the two linkages and the two actuators to be lifted upwards. This causes the two actuators to swing downwards around their hinge points with the mounting bracket. The actuator ends of the two actuators rest against the top of the push plate, and the bottom of the push plate rests against the self-locking mechanism. The two actuators, through the push plate, push the self-locking mechanism downwards, releasing the actuator assembly from the upper diaphragm assembly. The entire actuator assembly then resets under its own elastic force, while the upper diaphragm assembly resets independently, returning to its state before parking brake preparation.

[0009] This manual release mechanism uses hinged actuating rods on both sides of the mounting base. The actuating rods are arranged laterally with a connecting end and an actuating end at their two ends, respectively. The actuating rods can swing downward around their hinge points with the mounting base. The actuating ends of the two actuating rods are opposite. Connecting rods are hinged between the connecting ends of the two actuating rods and the connecting head. The hinge points of the two connecting rods and the connecting head are collinear. In this way, when the rope is pulled up, the connecting rods hinged between the connecting head and the actuating rods can drive the actuating rods to swing downward and generate a thrust to release the actuator assembly from the upper diaphragm assembly. Obviously, this structure does not require the additional machining of two meshing teeth as in the prior art. Therefore, there is no problem of misfitting due to wear of gears after long-term use. This ensures the stability of power transmission and improves the reliability of operation. At the same time, it also makes the structure simpler and easier to manufacture.

[0010] In the aforementioned manual release mechanism for a brake chamber, the length of the power arm of the actuating rod is greater than the length of the resistance arm.

[0011] Using the hinge position between the actuating rod and the mounting base as the boundary, the section from the hinge position to the connecting end of the actuating rod is the power arm of the actuating rod, and the section from the hinge position to the actuating end of the actuating rod is the resistance arm of the actuating rod. Setting the length of the power arm to be greater than the length of the resistance arm can form a force-saving lever, thereby making it easier for the operator to perform manual release operations.

[0012] In the aforementioned manual release mechanism for a brake chamber, the actuating end of the actuating rod is hinged to a roller via a pin. The roller extends downward beyond the actuating end of the actuating rod and abuts against the top of the push plate.

[0013] The actuating rod does not directly contact the push plate; instead, the roller contacts the push plate. When the actuating rod swings downward around its hinge point with the mounting base, the roller rolls on the push plate. This changes sliding friction into rolling friction, reducing resistance and making operation easier, while also reducing wear.

[0014] In the aforementioned manual release mechanism for a brake chamber, two connecting rods are located between two actuating rods, the mounting base is block-shaped with a Z-shaped cross-section, and the hinge positions of the two actuating rods and the mounting base are located on two parts of the mounting base with opposite protrusion directions.

[0015] In the aforementioned manual release mechanism for a brake chamber, the upper end of the actuator assembly has a shoulder, and a return spring is sleeved on the actuator assembly. The upper and lower ends of the return spring abut against the push plate and the shoulder, respectively.

[0016] The return spring is sleeved on the actuator assembly, with its upper and lower ends abutting against the push plate and the shoulder, respectively. Since the shoulder is part of the actuator assembly itself, the spring force of the return spring acts stably upward on the push plate. When the push plate is pressed downward, the return spring is compressed. After the pull rope is released, the return spring resets the pull rope and pushes the push plate upward. As the push plate returns, it generates an upward thrust on the actuating end of the actuator rod, causing the actuator rod, connecting rod, and connector to return to their original positions together.

[0017] In the aforementioned manual release mechanism for a brake chamber, the upper end of the actuator assembly has an annular groove on its outer periphery below the shoulder position. The upper diaphragm assembly includes an upper diaphragm and a guide sleeve fixed to the inner ring of the upper diaphragm. The self-locking component includes a self-locking ring and a self-locking spring both sleeved on the guide sleeve. The upper end of the self-locking spring abuts against the self-locking ring. The side of the guide sleeve has several through holes, each containing a ball. The inner peripheral wall of the self-locking ring has an annular groove, with the lower side wall of the annular groove inclined downwards. Each ball is partially located within the annular groove and abuts against the lower side wall of the annular groove. The actuator assembly passes through the guide sleeve. When the guide sleeve moves to the point where the through hole aligns with the annular groove, the self-locking ring, under the action of the self-locking spring, pushes each ball into the annular groove through the lower side wall of the annular groove. The center area at the bottom of the push plate has a clearance groove, with the upper end of the return spring located within the clearance groove, which faces the upper end of the guide sleeve.

[0018] Initially, the diaphragm assembly and self-locking mechanism are in a low position. Each ball is partially protruding from the through-hole and positioned within the annular groove of the self-locking ring due to pressure from the outer wall of the actuator assembly. Simultaneously, the self-locking ring, under the action of the self-locking spring, causes the lower wall of the annular groove to press against each ball, exerting a compressive force towards the inside of the through-hole. When preparing for parking braking, air is inflated into the lower part of the upper chamber, causing the diaphragm to deform upwards. This moves the guide sleeve, self-locking ring, self-locking spring, and each ball upwards together. When the guide sleeve moves to the point where its side through holes align with the annular grooves on the actuator assembly, the annular grooves provide space for the balls to move. Since the lower wall of the annular groove of the self-locking ring is inclined, the lower wall of the annular groove of the self-locking ring, under the force of the self-locking spring, pushes the balls into the annular groove within the through holes. Simultaneously, the annular groove of the self-locking ring and the balls are vertically misaligned, and the balls are held in place by the inner circumferential wall of the self-locking ring. This achieves the fixation of the actuator assembly and the deformed upper diaphragm. With the actuator assembly and upper diaphragm fixed, the self-locking ring rests against the bottom of the push plate, and the upper end of the guide sleeve faces the clearance groove at the bottom of the push plate.

[0019] When the pull cord is pulled for manual release, the pusher moves downward along the actuator assembly and pushes the self-locking ring downward. At the same time, the clearance groove provides clearance space for the upper end of the guide sleeve to prevent the pusher from applying downward pressure on the guide sleeve simultaneously. When the self-locking ring moves downward until the annular groove aligns with the through hole, the ball is no longer held in place, thus releasing the actuator assembly from the upper diaphragm. The actuator assembly then resets under its own elastic force.

[0020] Compared with existing technologies, the manual release mechanism of this brake chamber has actuating rods hinged to both sides of the mounting base. The actuating rods are arranged laterally with a connecting end and an actuating end at their two ends, respectively. The actuating rods can swing downward around their hinge points with the mounting base. The actuating ends of the two actuating rods are opposite. Connecting rods are hinged between the connecting ends of the two actuating rods and the connecting head. The hinge points of the two connecting rods and the connecting head are collinear. In this way, when the rope is pulled up, the connecting rods hinged between the connecting head and the actuating rods can drive the actuating rods to swing downward and generate a thrust to release the actuator assembly from the upper diaphragm assembly. Obviously, this structure does not require the additional machining of two meshing teeth, thus avoiding the situation of misfitting due to wear of gears after long-term use. This greatly improves the reliability of the operation and also makes the structure simpler and easier to manufacture. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the brake chamber before parking and braking preparation.

[0022] Figure 2 This is a three-dimensional schematic diagram of the manual release mechanism of the brake chamber.

[0023] Figure 3 This is a cross-sectional view of the manual release mechanism of this brake chamber.

[0024] Figure 4 This is a cross-sectional view of the brake chamber in the parking and braking preparation state.

[0025] Figure 5 This is a cross-sectional view of the brake chamber in the parking braking state.

[0026] Figure 6 This is a cross-sectional view of the brake chamber in the manually released parking brake state.

[0027] In the diagram, 1. Outer shell; 1a. Upper chamber; 1b. Lower chamber; 2. Upper diaphragm assembly; 2a. Upper diaphragm; 2b. Guide sleeve; 3. Actuator assembly; 3a. Push rod; 3a1. Shoulder; 3a2. Annular groove; 3b. Lower diaphragm; 3c. Push rod; 3d. Return spring; 4. High-strength spring; 5. Self-locking component; 5a. Self-locking ring; 5a1. Annular groove; 5b. Self-locking spring; 6. Pull rope; 7. Mounting base; 8. Connector; 9. Push plate; 9a. Clearance groove; 10. Return spring; 11. Actuating rod; 12. First hinge shaft; 13. Connecting rod; 14. Second hinge shaft; 15. Third hinge shaft; 16. Roller; 17. Pin; 18. Mounting screw; 19. Ball bearing. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, a manual release mechanism for a brake chamber includes a housing 1, an upper diaphragm assembly 2 whose outer ring is fixed to the housing 1, and an elastic actuator assembly 3 slidably disposed within the housing 1. A strong spring 4 is also provided inside the housing 1, with its upper and lower ends abutting against the inner wall of the housing 1 and the upper diaphragm assembly 2, respectively. The actuator assembly 3 passes through the upper diaphragm assembly 2, and a self-locking member 5 is provided between the two to fix them together after the upper diaphragm assembly 2 deforms upward. The self-locking member 5 can move downward relative to the upper diaphragm assembly 2 to release the upper diaphragm assembly 2 from the actuator assembly 3. This manual release mechanism includes a pull rope 6, a mounting base 7, a connector 8, a push plate 9, and a return spring 10. The mounting base 7 is fixedly connected to the upper end of the actuator assembly 3. The connector 8 is located above the mounting base 7 and connected to the pull rope 6. Two actuator rods 11 are hinged to the side of the mounting base 7 via two first hinge shafts 12. The actuator rods 11 are arranged laterally with a connecting end and an actuator end at their two ends, respectively. The actuator rods 11 can swing downwards around their hinge point with the mounting base 7. Connecting rods 13 are hinged between the connecting ends of the two actuator rods 11 and the connector 8. Specifically, one end of the connecting rod 13... The connecting end of the actuating rod 11 is hinged to the second hinge shaft 14, and the other end of the connecting rod 13 is hinged to the connecting head 8. The hinge points of the two connecting rods 13 and the connecting head 8 are collinear. In this embodiment, the two connecting rods 13 are hinged to the connecting head 8 through the same third hinge shaft 15. The actuating ends of the two connecting rods are directly or hinged against the top of the push plate 9. The elastic force of the return spring 10 acts upward on the push plate 9. When the self-locking member 5 fixes the actuator rod assembly 3 and the upper diaphragm assembly 2 together, the self-locking ring 5a abuts against the bottom of the push plate 9. When the push plate 9 moves downward, it can push the self-locking member 5 to move downward.

[0030] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the length from the hinge point between the actuating rod 11 and the mounting base 7 to the connecting end of the actuating rod 11 is greater than the length from the hinge point between the actuating rod 11 and the mounting base 7 to the working end of the actuating rod 11. This section from the hinge point between the actuating rod 11 and the mounting base 7 to the connecting end of the actuating rod 11 is the power arm of the actuating rod 11, and the section from the hinge point between the actuating rod 11 and the mounting base 7 to the working end of the actuating rod 11 is the resistance arm of the actuating rod 11. That is, the length of the power arm of the actuating rod 11 is greater than the length of the resistance arm, which can form a force-saving lever, making the operation of the operator easier. The working end of the actuating rod 11 is hinged to a roller 16 through a pin 17. The roller 16 extends downward beyond the working end of the actuating rod 11 and abuts against the top of the push plate 9. When the working end of the actuating rod 11 swings downward around its hinge point with the mounting base 7, the roller 16 will roll on the push plate 9. This can change sliding friction into rolling friction, reducing resistance and making the operation more effortless, while also reducing wear. Mounting base 7 has a central hole in the vertical direction, and the upper end of actuator assembly 3 has a mounting hole. Mounting base 7 and actuator assembly 3 are fixed together by mounting screws 18, whose rods pass through the central hole and are threaded into the mounting hole. The upper end of actuator assembly 3 has a shoulder 3a1, and a return spring 10 is sleeved on actuator assembly 3. The upper and lower ends of return spring 10 abut against push plate 9 and shoulder 3a1, respectively. Two connecting rods 13 are located between two actuating rods 11. Mounting base 7 is block-shaped with a Z-shaped cross-section. The hinge positions of the two actuating rods 11 and mounting base 7 are located on two parts of mounting base 7 with opposite protrusion directions. Mounting base 7 has a central hole in the vertical direction, and the upper end of actuator assembly 3 has a mounting hole. Mounting base 7 and actuator assembly 3 are fixed together by mounting screws 18, whose rods pass through the central hole and are threaded into the mounting hole.

[0031] In practice, such as Figure 1As shown, the outer casing 1 has an independent upper chamber 1a and a lower chamber 1b. An upper diaphragm 2a is located within the upper chamber 1a and divides it into upper and lower parts. The upper end of the actuator assembly 3 is located within the upper chamber 1a. An annular groove 3a2 is provided on the outer periphery of the upper end of the actuator assembly 3, below the position of the shoulder 3a1. The upper diaphragm assembly 2 includes an upper diaphragm 2a and a guide sleeve 2b fixed to the inner ring of the upper diaphragm 2a. The self-locking component 5 includes a self-locking ring 5a and a self-locking spring 5b, both sleeved on the guide sleeve 2b. Several through holes are provided on the outer periphery of the guide sleeve 2b, and each through hole contains a ball bearing 19. The upper end of the self-locking spring 5b abuts against the self-locking ring 5a. Several through holes are provided on the side of the guide sleeve 2b, and the inner periphery of the self-locking ring 5a is provided with… The annular groove 5a1 has a downwardly inclined lower wall. Each ball bearing 19 is partially located in the annular groove 5a1 and abuts against the lower wall of the annular groove 5a1. The actuator assembly 3 passes through the guide sleeve 2b. When the upper diaphragm 2a deforms upward and moves the guide sleeve 2b to the point where the through hole is opposite to the annular groove 3a2, the self-locking ring 5a, under the action of the self-locking spring 5b, squeezes each ball bearing 19 into the annular groove 3a2 through the lower wall of the annular groove 5a1. After the actuator assembly 3 is fixed to the upper diaphragm assembly 2, the self-locking ring 5a abuts against the bottom of the push plate 9. The center area of ​​the bottom of the push plate 9 is provided with a relief groove 9a. The upper end of the return spring 10 is located in the relief groove 9a, which faces the upper end of the guide sleeve 2b.

[0032] Furthermore, such as Figure 1 As shown, the actuator assembly 3 includes a push rod 3a, a lower diaphragm 3b, a push rod 3c, and a return spring 3d. The push rod 3a is located in the upper chamber 1a and an annular groove 3a2 is provided on the push rod 3a. The lower diaphragm 3b is located in the lower chamber 1b and its outer ring is fixed to the outer shell 1. The push rod 3c is T-shaped and its upper end is fixed to the lower diaphragm 3b. The push rod 3a is inverted T-shaped and its lower end is located in the lower chamber 1b and abuts against the lower diaphragm 3b. The return spring 3d is sleeved on the outside of the push rod 3c, and its two ends abut against the bottom wall of the lower chamber 1b and the upper end of the push rod 3c, respectively.

[0033] In the initial state, such as Figure 1As shown, the upper diaphragm assembly 2 and the self-locking element 5 are both located in the lower position of the upper chamber 1a, and the lower diaphragm 3b is located in the higher position of the lower chamber 1b. Each ball 19 is partially extended out of the through hole by the pressure of the outer peripheral wall of the actuator assembly 3 and is located in the annular groove 5a1 of the self-locking ring 5a. At the same time, due to the action of the self-locking spring 5b, the lower side wall of the annular groove 5a1 of the self-locking ring 5a abuts against each ball 19 and forms a pressing force on it towards the inside of the through hole. When preparing for parking braking, air is inflated in the space below the upper diaphragm assembly 2 in the upper chamber 1a. At this time, the actuator assembly 3 remains stationary, while the upper diaphragm 2a, guide sleeve 2b, each ball 19, and self-locking element 5 move upward together relative to the actuator assembly 3. When the guide sleeve 2b moves to the point where its side through holes are aligned with the annular grooves 3a2 on the actuator assembly 3, the annular grooves 3a2 provide movable space for each ball 19. Since the lower side wall of the annular groove 3a2 of the self-locking ring 5a is inclined, under the elastic force of the self-locking spring 5b, the lower side wall of the annular groove 3a2 of the self-locking ring 5a will push each ball 19 into the annular groove 3a2 within the through holes. Simultaneously, the annular groove 5a1 of the self-locking ring 5a and each ball 19 are vertically misaligned, and the inner circumferential wall of the self-locking ring 5a holds each ball 19 in place. This achieves the fixation of the actuator assembly 3 and the deformed upper membrane 2a. This state is as follows: Figure 4 As shown. With the actuator assembly 3 fixed to the upper diaphragm 2a, the self-locking ring 5a abuts against the bottom of the push plate 9, and the upper end of the guide sleeve 2b faces the clearance groove 9a at the bottom of the push plate 9.

[0034] When parking braking is required, the upper chamber 1a is vented in the space below the upper diaphragm assembly 2. At this time, the strong spring 4 returns to its original position, pushing the upper diaphragm assembly 2 and the push rod 3a downwards together. The push rod 3a pushes the lower diaphragm 3b and the push rod 3c downwards against the action of the return spring 3d. The push rod 3c extends out of the outer shell 1 and drives the brake fixed on the bogie of the rail transit to apply the brake. This state is as follows: Figure 5 As shown. After braking is completed, the upper chamber 1a is inflated again in the space below the upper diaphragm assembly 2, causing the upper diaphragm assembly 2, along with the push rod 3a, to move upward. At the same time, the push rod 3c and the upper diaphragm 2a return to their original positions under the action of the return spring 3d, thereby releasing the parking brake and returning to the starting position. Figure 4 The state shown.

[0035] When a vehicle malfunctions or other reasons prevent the parking brake from being released due to air inflation in the upper chamber 1a within the space below the upper diaphragm assembly 2, manual release of the parking brake is required. At this time, if... Figure 6As shown, the worker pulls the rope 6 upwards, and the rope 6 pulls the two connecting rods 13 upwards through the connector 8. Then, the two connecting rods 13 are hinged to the two action rods 11, so that the connecting ends of the two action rods 11 are lifted upwards. In this way, the two action rods 11 will swing downwards around their hinge point with the mounting base 7. The action ends of the two action rods 11 are against the top of the push plate 9, and the bottom of the push plate 9 is against the self-locking ring 5a in the locked state. In this way, the two action rods 11 will push the self-locking ring 5a downwards through the push plate 9 to release the fixation between the push rod 3a and the upper diaphragm assembly 2. As a result, the entire actuator assembly 3 will be reset under the action of the return spring 3d, and the upper diaphragm assembly 2 will be moved to the position before parking brake preparation by the action of the strong spring 4.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A manual release mechanism for a brake chamber, the brake chamber comprising a housing (1), an upper diaphragm assembly (2) whose outer ring is fixed to the housing (1), and an elastic actuator assembly (3) slidably disposed within the housing (1), the actuator assembly (3) passing through the upper diaphragm assembly (2) and having a self-locking member (5) provided between them to fix them together after the upper diaphragm assembly (2) deforms upwards, the manual release mechanism comprising a pull rope (6) and a mounting base (7) fixed to the upper end of the actuator assembly (3), characterized in that, This manual release mechanism also includes a connector (8), a push plate (9), and a return spring (10). The connector (8) is located above the mounting base (7) and connected to the pull rope (6). Actuating rods (11) are hinged to both sides of the mounting base (7). The actuating rods (11) are arranged laterally with their ends being the connecting end and the actuating end, respectively. The actuating rods (11) can swing downwards around their hinge point with the mounting base (7). The actuating ends of the two actuating rods (11) are opposite. The connecting end of the connecting rod (8) is hinged to the connecting head (8), and the two connecting rods (13) are collinear with the hinge point of the connecting head (8). The push plate (9) is sleeved on the actuator assembly (3). The working ends of the two actuators (11) directly or indirectly abut against the top of the push plate (9). The spring force of the return spring (10) acts upward on the push plate (9). When the actuator assembly (3) is fixed with the upper diaphragm assembly (2), the self-locking part (5) abuts against the bottom of the push plate (9).

2. The manual release mechanism for a brake chamber according to claim 1, characterized in that, The length of the power arm of the action rod (11) is greater than the length of the resistance arm.

3. The manual release mechanism for a brake chamber according to claim 2, characterized in that, The working end of the actuating rod (11) is hinged to a roller (16) via a pin (17). The roller (16) extends downward beyond the working end of the actuating rod (11) and abuts against the top of the push plate (9).

4. The manual release mechanism for a brake chamber according to claim 3, characterized in that, The two connecting rods (13) are located between the two action rods (11). The mounting base (7) is block-shaped and its cross-section is Z-shaped. The hinge positions of the two action rods (11) and the mounting base (7) are located on the two parts of the mounting base (7) with opposite protrusion directions.

5. A manual release mechanism for a brake chamber according to claim 1, 2, 3, or 4, characterized in that, The actuator assembly (3) has a shoulder (3a1) at its upper end. A return spring (10) is sleeved on the actuator assembly (3). The upper and lower ends of the return spring (10) abut against the push plate (9) and the shoulder (3a1) respectively.

6. The manual release mechanism for a brake chamber according to claim 5, characterized in that, The actuator assembly (3) has an annular groove (3a2) on its outer periphery at a position lower than the shoulder (3a1) on its upper end. The upper diaphragm assembly (2) includes an upper diaphragm (2a) and a guide sleeve (2b) fixed to the inner ring of the upper diaphragm (2a). The self-locking component (5) includes a self-locking ring (5a) and a self-locking spring (5b) both sleeved on the guide sleeve (2b). The upper end of the self-locking spring (5b) abuts against the self-locking ring (5a). The side of the guide sleeve (2b) has several through holes, each with a ball (19). The inner periphery of the self-locking ring (5a) has an annular groove (5a1), and the lower side wall of the annular groove (5a1) slopes downward. The ball bearings (19) are arranged at an angle, and each ball bearing (19) is partially located in the annular groove (5a1) and abuts against the lower side wall of the annular groove (5a1). The actuator assembly (3) passes through the guide sleeve (2b). When the guide sleeve (2b) moves to the point where the through hole is opposite to the annular slot (3a2), the self-locking ring (5a) squeezes each ball bearing (19) into the annular slot (3a2) through the lower side wall of the annular groove (5a1) under the action of the self-locking spring (5b). The bottom center area of ​​the push plate (9) is provided with a relief groove (9a). The upper end of the return spring (10) is located in the relief groove (9a). The relief groove (9a) faces the upper end of the guide sleeve (2b).

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