Transmission gear shifting brake device and working method thereof

Abstract

The invention relates to a transmission gear shifting brake device and a working method thereof. The transmission gear shifting brake device comprises a transmission shell and an intermediate shaft, and a brake concave part is arranged on the periphery of the intermediate shaft; a brake block is arranged on the periphery of the transmission shell and is driven by an actuator to be wedged into the brake concave part. A first inclined surface is arranged at the inner end of the brake block, a first blocking surface is arranged on the periphery of the brake block in the reverse rotation direction of the transmission, and a second blocking surface is arranged on the periphery of the brake block in the forward rotation direction of the transmission; the brake concave part is a brake hole, the outer side end of the brake hole is provided with a second inclined face corresponding to the first inclined face, and the periphery of the brake hole is provided with a third blocking face corresponding to the first blocking face and a fourth blocking face corresponding to the second blocking face. The one-way clutch has few parts, can be realized by a simple traditional processing technology, can be used for braking one element and one set of device, can replace a one-way overrunning clutch and multiple groups of friction plates in most transmissions to realize braking and one-way functions, and is extremely small in size and extremely low in cost.

Description

Technical Field

[0001] The invention relates to a transmission shift braking device and a working method thereof. Background Art

[0002] Chinese Patent No. CN202010174847.7 discloses a movable wedge block shifting mechanism. Compared with other shifting mechanisms with the same functions, this mechanism can significantly reduce the volume of the transmission, reduce the clamping force required to clamp the shifting elements, and reduce costs and energy losses. However, it also has shortcomings such as excessive wear of the dual plates and carrier plates, and support plates and elastomer baffles when shifting at high speeds and large speed ratios. At the same time, the dual plates, carrier plates, support plates and elastomer baffles are required to have larger sizes, especially larger radial sizes. Therefore, there is still room for improvement in terms of volume, cost, energy consumption, etc. Summary of the invention

[0003] The present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a transmission shift braking device and a working method thereof.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a transmission shift braking device, including a transmission housing and an intermediate shaft arranged in the transmission housing, the outer periphery of the intermediate shaft is provided with a braking recess; the periphery of the transmission housing is provided with a brake block, and the brake block is driven by an actuator to move in a direction perpendicular to the axis of the transmission and wedge into the braking recess to block the rotation of the intermediate shaft.

[0005] Furthermore, the inner end of the brake block is provided with a first inclined surface along the reverse rotation direction of the transmission, the outer periphery of the brake block is provided with a first blocking surface along the reverse rotation direction of the transmission, and the outer periphery of the brake block is provided with a second blocking surface along the forward rotation direction of the transmission; the braking recess is a braking hole, the outer end of the braking hole is provided with a second inclined surface corresponding to the first inclined surface, and the periphery of the brake hole is provided with a third blocking surface corresponding to the first blocking surface and a fourth blocking surface corresponding to the second blocking surface.

[0006] Furthermore, the first blocking surface and the second blocking surface are oppositely distributed on both sides of the periphery of the brake block.

[0007] Furthermore, it also includes a brake housing fixedly arranged on the transmission housing, the actuator is arranged in the brake housing, the actuator includes a piston cavity, a piston arranged in the piston cavity, and the inner end of the piston is fixedly connected to the brake block.

[0008] Furthermore, a return cavity is provided at the outer end of the piston cavity, and the return cavity is connected to the piston cavity to form a step cavity, and the inner diameter of the return cavity is larger than the inner diameter of the piston cavity; a return disk is provided at the outer end of the piston, and the brake block, the piston and the return disk form an integral piston assembly, and the return disk is arranged in the return cavity and cooperates with the gap of the inner wall of the return cavity to facilitate gas flow, and a return spring is provided between the return disk and the brake housing and is sleeved on the outside of the piston, and one end of the return spring abuts against the return disk and the other end abuts against the step wall of the step cavity.

[0009] Furthermore, a cavity cover is provided at the outer end of the return cavity, and the cavity cover is provided with an air inlet and an air outlet for the compressed gas.

[0010] Furthermore, one or more anti-rotation pins are provided on the cavity cover; one or more anti-rotation holes are provided on the return disk, and the anti-rotation pins are inserted into the anti-rotation holes; and a locally protruding contact surface is provided on the outer end face of the return disk to prevent the return disk from fitting against the cavity cover.

[0011] Furthermore, the axis of the brake block and the axis of the brake hole are both perpendicular to the axis of the transmission, and the axis of the intermediate shaft coincides with the axis of the transmission.

[0012] Furthermore, the intermediate shaft is a ring gear or a sun gear of a planetary gear set.

[0013] Another technical solution adopted by the present invention is: a working method of a transmission shift brake device, comprising the following working method: (1) Initial state: The piston chamber is at normal pressure. Under the action of the return spring, the return plate of the piston assembly contacts the chamber cover through the contact surface, and the brake block and the intermediate shaft are in a separated state. (2) During braking: the piston chamber is inflated, and the piston assembly overcomes the elastic force of the return spring under the action of air pressure and moves toward the intermediate shaft. At this time, there are two types of positional relationships between the brake block and the intermediate shaft: one is that the brake block is wedged into the brake hole of the intermediate shaft. At this time, if the intermediate shaft rotates backward, the second blocking surface of the brake block contacts the fourth blocking surface of the brake hole to block each other, and the intermediate shaft no longer rotates; if the intermediate shaft rotates forward, the first blocking surface of the brake block contacts the third blocking surface of the brake hole to block each other, and the intermediate shaft no longer rotates; the other is that the inner end of the brake block presses against the raised part of the intermediate shaft. At this time If the intermediate shaft rotates in reverse, the intermediate shaft and the brake block rotate relatively, and the brake block slides over the outer peripheral surface of the intermediate shaft until the inner end of the brake block is wedged into the brake hole of the intermediate shaft, and the second blocking surface of the brake block contacts with the fourth blocking surface of the brake hole to block each other, and the intermediate shaft stops rotating, and the intermediate shaft is braked and stops rotating; if the intermediate shaft rotates forward, the intermediate shaft and the brake block rotate relatively, and the brake block slides over the outer peripheral surface of the intermediate shaft until the inner end of the brake block is wedged into the brake hole of the intermediate shaft, and the first blocking surface of the brake block contacts with the third blocking surface of the brake hole to block each other, and the intermediate shaft stops rotating; (3) Shifting from braking to separation: During the forward operation of the transmission, the compressed gas pressure in the piston chamber gradually decreases, and the brake pad gradually leaves the brake hole of the intermediate shaft under the action of the return spring. When the brake pad retreats a certain amount, the intermediate shaft rotates forward. At this time, the first inclined surface of the brake pad contacts the second inclined surface of the brake hole. The axial component of the force of the second inclined surface of the brake hole on the first inclined surface of the inner end of the brake pad accelerates the brake pad to retreat. When the intermediate shaft rotates to the point where the convex surface of the non-braking hole contacts the brake pad, the intermediate shaft and the brake pad rotate relative to each other until the brake pad separates from the intermediate shaft, so that the brake device is in a disengaged state. (4) Shifting from separation to braking: During the forward operation of the transmission, the compressed gas pressure in the piston chamber gradually increases and overcomes the force of the return spring, pushing the brake block to approach and contact the intermediate shaft through the piston assembly. The subsequent process is the same as step (2), thereby achieving the shifting from separation to braking.

[0014] Compared with the prior art, the present invention has the following effects: the present invention has a simple and reasonable structure, fewer parts, and can be realized by simple traditional processing technology. Only one set of devices is required to brake one component. In most transmissions, it can replace the one-way overrunning clutch and multiple sets of friction plates to achieve braking and one-way functions. It has a very small size and extremely low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic diagram of a front cross-sectional structure of an embodiment of the present invention; Figure 2 yes Figure 1 A is an enlarged schematic diagram; Figure 3 is a schematic diagram of the three-dimensional structure of a piston assembly in an embodiment of the present invention; Figure 4 is a partially enlarged schematic diagram of an intermediate shaft in an embodiment of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the intermediate shaft in an embodiment of the present invention.

[0016] In the figure: 1-transmission housing; 2-intermediate shaft beam; 3-brake block; 301-first inclined surface; 302-first blocking surface; 303-second blocking surface; 4-actuator; 5-transmission axis; 6-brake hole; 601-second inclined surface; 602-third blocking surface; 603-fourth blocking surface; 7-brake housing; 8-piston chamber; 9-piston; 10-sealing ring; 11-return chamber; 12-return plate; 13-piston assembly; 14-return spring; 15-chamber cover; 16-air inlet and outlet; 17-anti-rotation pin; 18-anti-rotation hole; 19-contact surface. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] like Figures 1 to 5 As shown, a transmission shift brake device of the present invention comprises a transmission housing 1 and an intermediate shaft 2 coaxially arranged in the transmission housing 1, wherein the outer periphery of the intermediate shaft 2 is provided with one or more brake recesses, and the one or more brake recesses are evenly distributed along the outer periphery of the intermediate shaft; a brake block 3 is provided on the periphery of the transmission housing 1, and the brake block 3 is driven by an actuator 4 to move in a direction perpendicular to a transmission axis 5 and wedge into the brake recess to block the rotation of the intermediate shaft 2.

[0020] In this embodiment, Figure 3 As shown, the inner end of the brake block 3 is provided with a first inclined surface 301 inclined outward along the reverse rotation direction of the transmission, the outer periphery of the brake block 3 is provided with a first blocking surface 302 along the reverse rotation direction of the axis 5 of the transmission, and the outer periphery of the brake block 3 is provided with a second blocking surface 303 along the forward rotation direction of the axis of the transmission, and the first blocking surface 301 and the second blocking surface 302 are oppositely distributed on both sides of the periphery of the brake block 3. The brake recess is a brake hole or a brake groove, and the brake recess is preferably a brake hole, such as Figure 4 As shown, the braking recess is a braking hole 6, and the braking hole 6 corresponds to the position of the braking block 3. The outer end of the braking hole 6 is provided with a second inclined surface 601 that is convex and inclined toward the outside, and the second inclined surface 601 corresponds to the first inclined surface 301. The periphery of the braking hole 6 is provided with a third blocking surface 602 corresponding to the first blocking surface 302 and a fourth blocking surface 603 corresponding to the second blocking surface 303. During operation, when the braking block is wedged into the braking hole, if the intermediate shaft is in a reverse rotation (i.e., counterclockwise rotation) state, the second blocking surface of the braking block contacts and blocks the fourth blocking surface of the braking hole, so that the intermediate shaft does not rotate; if the intermediate shaft is in a forward rotation (i.e., clockwise rotation) state, the first blocking surface of the braking block contacts and blocks the third blocking surface of the braking hole, so that the intermediate shaft does not rotate.

[0021] In this embodiment, a brake housing 7 is further included which is fixedly arranged on the transmission housing 1 , and the brake housing is fixedly connected to the transmission housing, or the brake housing is integrated with the transmission housing. The actuator 4 is arranged in the brake housing 7 .

[0022] In this embodiment, the actuator 4 can be a pneumatic piston device, a hydraulic piston device, a screw device, an electromagnetic clutch device, etc., preferably a pneumatic piston device. Specifically: the actuator 4 includes a piston chamber 8, a piston 9 arranged in the piston chamber 8, and a sealing ring 10 is arranged on the inner periphery of the piston chamber 8 or the outer periphery of the piston 9. The inner end of the piston 9 is fixedly connected to the brake block 3, and the two are integrated together.

[0023] In this embodiment, a return cavity 11 is provided at the outer end of the piston cavity 8, and the return cavity 11 is connected with the piston cavity 8 to form a step cavity, and the inner diameter of the return cavity 11 is larger than the inner diameter of the piston cavity 8; a return disk 12 is provided at the outer end of the piston 9, and the return disk 12 is integrated with the piston 9, so that the brake block 3, the piston 9 and the return disk 12 form an integral piston assembly 13; the return disk 12 is arranged in the return cavity 11 and cooperates with the inner wall gap of the return cavity 11 to facilitate gas flow, and a return spring 14 is provided between the return disk 12 and the brake housing 7 and is sleeved on the outer side of the piston 9, and one end of the return spring 14 abuts against the return disk 12 and the other end abuts against the step wall of the step cavity. Preferably, the return spring is sleeved at the connection between the return disk and the piston. Since the thrust of pushing the piston assembly only needs to overcome the elastic force of the return spring, therefore, when the friction between the intermediate shaft and the brake block is small, it can be ignored and does not affect the relative rotation of the intermediate shaft and the brake block.

[0024] In this embodiment, the outer end of the return cavity 11 is provided with a cavity cover 15, and the cavity cover 15 is provided with an air inlet and outlet 16 for compressed gas, and the cavity cover is sealed and fixedly connected to the brake housing. Preferably, the air inlet and outlet are connected to a solenoid valve, and the air inlet and outlet are controlled by the solenoid valve.

[0025] In this embodiment, one or more anti-rotation pins 17 are provided on the cavity cover 15; one or more anti-rotation holes 18 are provided on the return plate 12, and the anti-rotation holes correspond to the positions of the anti-rotation pins. The anti-rotation pins 17 are inserted into the anti-rotation holes 18 to prevent the piston from rotating.

[0026] In this embodiment, a partially raised contact surface 19 is provided on one of the surfaces of the cavity cover 15 facing the return disk 12 to prevent the cavity cover and the return disk from being adsorbed together. Preferably, a partially raised contact surface 19 is provided on the outer end surface of the return disk 12 .

[0027] In this embodiment, the axis of the brake block 3 and the axis of the brake hole 6 are both perpendicular to the transmission axis 5 , and the axis of the intermediate shaft 2 coincides with the transmission axis 5 .

[0028] In this embodiment, the intermediate shaft 2 is a ring gear or a sun gear of a planetary gear set.

[0029] In this embodiment, assuming that the radial load area of ​​the piston is S1, the radial load area of ​​the return plate is S2, and the contact area between the return spring and the return plate is S3, the effective working cross-sectional area of ​​the piston is S=S1+S3. Without considering the friction resistance, if the stable air pressure in the piston chamber after ventilation is P, and the elastic force of the return spring is N, the force on the piston after stabilization is F=PS-N=P(S1+S3)-N.

[0030] The working method of the transmission shift brake device includes the following working methods: (1) Initial state: The piston chamber is at normal pressure. Under the action of the return spring, the return plate of the piston assembly contacts the chamber cover through the contact surface, and the brake block and the intermediate shaft are in a separated state. (2) During braking: the piston chamber is inflated, and the piston assembly overcomes the elastic force of the return spring under the action of air pressure and moves toward the intermediate shaft. At this time, there are two types of positional relationships between the brake block and the intermediate shaft: one is that the brake block is wedged into the brake hole of the intermediate shaft. At this time, if the intermediate shaft rotates backward, the second blocking surface of the brake block contacts the fourth blocking surface of the brake hole to block each other, and the intermediate shaft no longer rotates; if the intermediate shaft rotates forward, the first blocking surface of the brake block contacts the third blocking surface of the brake hole to block each other, and the intermediate shaft no longer rotates; the other is that the inner end of the brake block presses against the raised part of the intermediate shaft. At this time, if the intermediate shaft rotates backward, the intermediate shaft and the brake block rotate relative to each other, and the brake block slides over the outer peripheral surface of the intermediate shaft. Until the inner end of the brake block is wedged into the brake hole of the intermediate shaft, the second blocking surface of the brake block contacts with the fourth blocking surface of the brake hole to block each other, and the intermediate shaft stops rotating, and the intermediate shaft is braked and stops rotating; if the intermediate shaft rotates forward, the intermediate shaft and the brake block rotate relatively, and the brake block slides over the outer peripheral surface of the intermediate shaft until the inner end of the brake block is wedged into the brake hole of the intermediate shaft, and the first blocking surface of the brake block contacts with the third blocking surface of the brake hole to block each other, and the intermediate shaft stops rotating; because the thrust of the piston assembly only needs to overcome the elastic force of the return spring, therefore, when the friction between the intermediate shaft and the brake block is small, it can be ignored and does not affect the relative rotation of the intermediate shaft and the brake block; (3) Shifting from braking to separation: During the forward operation of the transmission, the compressed gas pressure in the piston chamber gradually decreases, and the brake pad gradually leaves the brake hole of the intermediate shaft under the action of the return spring. When the brake pad retreats a certain amount, the intermediate shaft rotates forward. At this time, the first inclined surface of the brake pad contacts the second inclined surface of the brake hole. The axial component of the force of the second inclined surface of the brake hole on the first inclined surface of the inner end of the brake pad accelerates the brake pad to retreat. When the intermediate shaft rotates to the point where the convex surface of the non-braking hole contacts the brake pad, the intermediate shaft and the brake pad rotate relative to each other until the brake pad separates from the intermediate shaft, so that the brake device is in a disengaged state. (4) Shifting from separation to braking: During the forward operation of the transmission, the compressed gas pressure in the piston chamber gradually increases and overcomes the force of the return spring, pushing the brake block to approach and contact the intermediate shaft through the piston assembly. The subsequent process is the same as step (2), thereby achieving the shifting from separation to braking.

[0031] The advantages of the present invention are: (1) The braking device has few parts and a simple structure. It can be realized by simple traditional processing technology. One set of devices is enough to brake one component. In most transmissions, it can replace the one-way overrunning clutch and multiple sets of friction plates to achieve braking and one-way functions. It is very small in size and has extremely low cost. (2) This structure has low actuator power requirements, but large braking force and flexible application. By appropriately increasing the size of the brake block, the braking capacity can be increased. Therefore, a brake device can be applied to transmissions of multiple specifications, which is conducive to increasing batch size and further reducing manufacturing costs. (3) Since the thrust required to push the brake pad is very small, the friction force is very small when the intermediate shaft and the brake pad rub against each other, the friction energy loss can be ignored, and the wear of the brake pad and the intermediate shaft can also be ignored. Therefore, the device has good reliability and low processing requirements; (4) No additional friction plate is required, no additional oil stirring energy loss is added, and the transmission is not prone to overheating; (5) There is no additional friction plate, and the wear debris generated during the sliding and grinding process is reduced accordingly, which is beneficial to keep the lubricating oil in the transmission clean and reduce failures caused by lubricating oil contamination; (6) Without additional friction plates, the inertia during the gear shifting process is reduced, which is more conducive to improving the gear shifting speed and smoothness.

[0032] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0033] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0034] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A transmission shift brake device, comprising a transmission housing and an intermediate shaft arranged in the transmission housing, characterized in that: The outer periphery of the intermediate shaft is provided with a braking recess; the periphery of the transmission housing is provided with a braking block, which is driven by an actuator to move in a direction perpendicular to the transmission axis and wedge into the braking recess to block the rotation of the intermediate shaft.

2. A transmission shift brake device according to claim 1, characterized in that: The inner end of the brake block is provided with a first inclined surface along the reverse rotation direction of the transmission, the outer periphery of the brake block is provided with a first blocking surface along the reverse rotation direction of the transmission, and the outer periphery of the brake block is provided with a second blocking surface along the forward rotation direction of the transmission; the braking recess is a braking hole, the outer end of the braking hole is provided with a second inclined surface corresponding to the first inclined surface, and the periphery of the brake hole is provided with a third blocking surface corresponding to the first blocking surface and a fourth blocking surface corresponding to the second blocking surface.

3. A transmission shift brake device according to claim 2, characterized in that: The first blocking surface and the second blocking surface are oppositely distributed on both sides of the periphery of the brake block.

4. The transmission shift brake device according to claim 1, characterized in that: It also includes a brake housing fixedly arranged on the transmission housing. The actuator is arranged in the brake housing. The actuator includes a piston cavity and a piston arranged in the piston cavity. The inner end of the piston is fixedly connected to the brake block.

5. A transmission shift brake device according to claim 4, characterized in that: A return cavity is provided at the outer end of the piston cavity, and the return cavity is connected with the piston cavity to form a step cavity, and the inner diameter of the return cavity is larger than the inner diameter of the piston cavity; a return disk is provided at the outer end of the piston, and the brake block, the piston and the return disk form an integral piston assembly, and the return disk is arranged in the return cavity and cooperates with the gap of the inner wall of the return cavity to facilitate gas flow, and a return spring is provided between the return disk and the brake housing and is sleeved on the outer side of the piston, and one end of the return spring abuts against the return disk, and the other end abuts against the step wall of the step cavity.

6. A transmission shift brake device according to claim 5, characterized in that: The outer end of the return cavity is provided with a cavity cover, and the cavity cover is provided with an air inlet and an air outlet for the compressed gas.

7. A transmission shift brake device according to claim 6, characterized in that: The cavity cover is provided with one or more anti-rotation pins; the return disk is provided with one or more anti-rotation holes, and the anti-rotation pins are inserted into the anti-rotation holes; the outer end surface of the return disk is provided with a locally protruding contact surface to prevent the return disk from fitting against the cavity cover.

8. The transmission shift brake device according to claim 1, characterized in that: The axis of the brake block and the axis of the brake hole are both perpendicular to the axis of the transmission, and the axis of the intermediate shaft coincides with the axis of the transmission.

9. The transmission shift brake device according to claim 1, characterized in that: The intermediate shaft is the ring gear or the sun gear of the planetary gear set.

10. A working method of a transmission shift brake device, characterized in that: The invention comprises a transmission shift brake device as claimed in any one of claims 1 to 9, and includes the following working method: (1) Initial state: The piston chamber is at normal pressure. Under the action of the return spring, the return plate of the piston assembly contacts the chamber cover through the contact surface, and the brake block and the intermediate shaft are in a separated state. (2) During braking: the piston chamber is inflated, and the piston assembly overcomes the elastic force of the return spring under the action of air pressure and moves toward the intermediate shaft. At this time, there are two types of positional relationships between the brake block and the intermediate shaft: one is that the brake block is wedged into the brake hole of the intermediate shaft. At this time, if the intermediate shaft rotates backward, the second blocking surface of the brake block contacts the fourth blocking surface of the brake hole to block each other, and the intermediate shaft no longer rotates; if the intermediate shaft rotates forward, the first blocking surface of the brake block contacts the third blocking surface of the brake hole to block each other, and the intermediate shaft no longer rotates; the other is that the inner end of the brake block presses against the raised part of the intermediate shaft. At this time If the intermediate shaft rotates in reverse, the intermediate shaft and the brake block rotate relatively, and the brake block slides over the outer peripheral surface of the intermediate shaft until the inner end of the brake block is wedged into the brake hole of the intermediate shaft, and the second blocking surface of the brake block contacts with the fourth blocking surface of the brake hole to block each other, and the intermediate shaft stops rotating, and the intermediate shaft is braked and stops rotating; if the intermediate shaft rotates forward, the intermediate shaft and the brake block rotate relatively, and the brake block slides over the outer peripheral surface of the intermediate shaft until the inner end of the brake block is wedged into the brake hole of the intermediate shaft, and the first blocking surface of the brake block contacts with the third blocking surface of the brake hole to block each other, and the intermediate shaft stops rotating; (3) Shifting from braking to separation: During the forward operation of the transmission, the compressed gas pressure in the piston chamber gradually decreases, and the brake pad gradually leaves the brake hole of the intermediate shaft under the action of the return spring. When the brake pad retreats a certain amount, the intermediate shaft rotates forward. At this time, the first inclined surface of the brake pad contacts the second inclined surface of the brake hole. The axial component of the force of the second inclined surface of the brake hole on the first inclined surface of the inner end of the brake pad accelerates the brake pad to retreat. When the intermediate shaft rotates to the point where the convex surface of the non-braking hole contacts the brake pad, the intermediate shaft and the brake pad rotate relative to each other until the brake pad separates from the intermediate shaft, so that the brake device is in a disengaged state. (4) Shifting from separation to braking: During the forward operation of the transmission, the compressed gas pressure in the piston chamber gradually increases and overcomes the force of the return spring, pushing the brake block to approach and contact the intermediate shaft through the piston assembly. The subsequent process is the same as step (2), thereby achieving the shifting from separation to braking.

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