A kind of intermediate shaft brake

Abstract

The application belongs to the technical field of braking equipment, and discloses a middle shaft brake, which comprises a shell assembly, a piston, a friction assembly and a constraint piece, the shell assembly is provided with a working cavity, and the middle shaft extends into the working cavity; the peripheral part of the piston is attached to the inner cavity wall of the working cavity, the side of the piston away from the middle shaft forms an air cavity together with the working cavity, and the shell assembly is provided with an air duct communicating with the air cavity; the friction assembly comprises a first friction plate and a second friction plate, the first friction plate is fixed on the middle shaft, and the piston moving towards the middle shaft can push the second friction plate to tightly abut against the first friction plate; the constraint piece comprises a fixing pin and a constraint plate, the fixing pin is fixed in the working cavity and is axially parallel to the middle shaft, the constraint plate is fixed on the piston and is provided with a first sliding groove, and the constraint plate slides along the axial direction of the fixing pin through the first sliding groove. The middle shaft brake can effectively avoid the piston rotating around the circumferential direction of the piston, and improve the durability and reliability of the sealing and the performance of the brake.

Description

Technical Field

[0001] This invention relates to the field of braking equipment technology, and more particularly to an intermediate shaft brake. Background Technology

[0002] Currently, most automated mechanical transmissions (AMTs) use a sliding gear sleeve for gear engagement. Upshifting requires reducing the target gear's speed, achieved by braking the intermediate shaft. Once the speed reaches a reasonable target range, gear engagement is performed for smooth shifting. After each upshift, a return spring pushes the top sleeve back to its original position, which in turn pushes the piston back. In existing technology, because the intermediate shaft rotates rapidly during transmission operation, relative rotation occurs between the piston, return spring, and intermediate shaft. The piston, due to friction from the return spring, rotates around its circumference, causing distortion and abnormal wear of the piston and its sealing rings, leading to premature seal failure. Air and oil leaks from these seals affect brake torque, thus impacting brake performance and durability. Summary of the Invention

[0003] The purpose of this invention is to provide an intermediate shaft brake with a simple structure that can effectively prevent the piston inside the intermediate shaft brake from rotating around its own circumference during operation, thereby improving the durability and reliability of the seal and the performance of the brake.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] An intermediate shaft brake, comprising:

[0006] A housing assembly having a working cavity, with an intermediate shaft passing through the housing assembly and extending into the working cavity;

[0007] A piston is movably disposed within the working chamber, with its periphery fitting against the inner wall of the working chamber. The side of the piston facing away from the intermediate shaft forms an air chamber together with the working chamber. The outer shell has an air duct communicating with the air chamber.

[0008] A friction assembly is disposed in the working chamber and includes a first friction plate and a second friction plate. The first friction plate is fixed on the intermediate shaft. The piston can move toward the intermediate shaft to push the second friction plate to press against the first friction plate.

[0009] A constraint component, disposed within the working cavity, includes a fixing pin and a constraint piece. The fixing pin is fixed within the working cavity and is arranged parallel to the axial direction of the intermediate shaft. The constraint piece is fixed to the piston and has a first sliding groove. The constraint piece slides along the axial direction of the fixing pin through the first sliding groove.

[0010] Preferably, the constraint piece is provided with a snap-fit ​​connector, and the piston is provided with a corresponding snap-fit ​​groove, and the snap-fit ​​connector is fixedly snapped into the snap-fit ​​groove.

[0011] Preferably, the constraint piece has a protruding head protruding along its circumference, the first groove is correspondingly formed on the protruding head, and the piston has a groove corresponding to the protruding head.

[0012] Preferably, the second friction plate has a second sliding groove, through which the second friction plate can slide along the fixing pin.

[0013] Preferably, a plurality of fixing pins are evenly spaced along the axial direction of the intermediate shaft, and the first groove of the constraint piece and the second groove of the second friction piece are respectively provided with the fixing pins one-to-one.

[0014] Preferably, the outer peripheral wall of the end of the intermediate shaft that extends into the working cavity is provided with a spline groove, the first friction plate is provided with a sleeve hole, and the inner peripheral wall of the sleeve hole is provided with a spline corresponding to the spline groove.

[0015] Preferably, the piston has a main gas groove on the side facing away from the intermediate shaft, and a plurality of gas distribution grooves are formed along the circumference of the piston on the outer edge of the main gas groove. The gas distribution grooves are connected to the main gas groove, and the main gas groove, the gas distribution grooves and the working chamber together form the gas chamber.

[0016] Preferably, the piston is fitted with a sealing ring, which fits against the inner wall of the working chamber.

[0017] Preferably, a return spring is also provided in the working chamber. The return spring is located between the piston and the intermediate shaft, and the return spring enables the piston to always have a tendency to move away from the intermediate shaft.

[0018] Preferably, the friction assembly is provided in multiple sets at intervals along the axial direction of the intermediate shaft, and the first friction plate and the second friction plate of the multiple sets of friction assemblies are alternately arranged along the axial direction of the intermediate shaft.

[0019] Beneficial effects:

[0020] The intermediate shaft brake provided by this invention has a simple structure. When the intermediate shaft brake is working, air is introduced into the air chamber inside the housing assembly through the air duct. The air chamber, filled with air, pushes the piston to move towards the intermediate shaft, pushing the second friction plate to move axially along the intermediate shaft to press against the first friction plate, thereby braking the intermediate shaft. Furthermore, by providing a constraint member, including a fixing pin and a constraint plate, the fixing pin is fixed inside the working chamber and axially parallel to the intermediate shaft. The constraint plate is fixed to the piston and has a first sliding groove. The constraint plate slides along the axial direction of the fixing pin through the first sliding groove. Under the sliding cooperation of the first sliding groove and the fixing pin, the piston can be effectively limited in circumferential rotation, preventing the piston inside the intermediate shaft brake from rotating around its own circumference during operation. This prevents the piston and its own sealing rings and other components from twisting and wearing, improving the durability and reliability of the seal and the performance of the brake. Attached Figure Description

[0021] Figure 1 This is an exploded schematic diagram of the intermediate shaft brake provided by the present invention;

[0022] Figure 2 This is a cross-sectional schematic diagram of the intermediate shaft brake provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the assembly structure of the piston and the constraint plate provided by the present invention;

[0024] Figure 4 This is an exploded schematic diagram of the piston section provided by the present invention;

[0025] Figure 5 This is a schematic diagram of the piston structure from one perspective provided by the present invention;

[0026] Figure 6 This is a structural schematic diagram of the piston provided by the present invention from another perspective.

[0027] In the picture:

[0028] 1. Housing assembly; 101. Working chamber; 102. Air chamber; 11. Outer shell; 111. Air duct; 12. End plate;

[0029] 2. Piston; 21. Snap-fit ​​groove; 22. Embedded groove; 231. Main air groove; 232. Air distribution groove; 24. Sealing ring; 25. Sleeve; 26. Nesting groove;

[0030] 3. Friction assembly; 31. First friction plate; 311. Spline; 32. Second friction plate; 321. Second groove;

[0031] 4. Constraint component; 41. Fixing pin; 42. Constraint piece; 421. First slide groove; 422. Snap connector; 423. Protrusion; 424. Through hole;

[0032] 5. Return spring; 51. Nested head;

[0033] 6. Intermediate shaft; 61. Spline groove; 62. Receiving groove. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0038] This embodiment provides an intermediate shaft brake. (Refer to...) Figures 1 to 6As shown, the intermediate shaft brake includes a housing assembly 1, a piston 2, a friction assembly 3, and a constraint member 4. The housing assembly 1 has a working chamber 101, and the intermediate shaft 6 extends through the housing assembly 1 into the working chamber 101. The piston 2 is movably disposed within the working chamber 101, with its periphery fitting against the inner wall of the working chamber 101. The side of the piston 2 facing away from the intermediate shaft 6, together with the working chamber 101, forms an air chamber 102. The housing assembly 1 has an air duct 111 communicating with the air chamber 102. The friction assembly 3 is disposed within the working chamber 101 and includes a first friction component. The first friction plate 31 is fixed on the intermediate shaft 6. When the piston 2 moves toward the intermediate shaft 6, it can push the second friction plate 32 to slide along the axial direction of the intermediate shaft 6 to press against the first friction plate 31. The constraint member 4 is provided in the working cavity 101 and includes a fixing pin 41 and a constraint plate 42. The fixing pin 41 is fixed in the working cavity 101 and is arranged parallel to the axial direction of the intermediate shaft 6. The constraint plate 42 is fixed on the piston 2 and has a first sliding groove 421. The constraint plate 42 slides along the axial direction of the fixing pin 41 through the first sliding groove 421.

[0039] In this embodiment, when the intermediate shaft brake is in operation, air is supplied to the air chamber 102 inside the housing assembly 1 through the air duct 111. The air chamber 102, filled with air, pushes the piston 2 towards the intermediate shaft 6, causing the second friction plate 32 to slide axially along the intermediate shaft 6 to press against the first friction plate 31, thereby braking the intermediate shaft 6. Furthermore, a constraint member 4 is provided, including a fixing pin 41 and a constraint plate 42. The fixing pin 41 is fixed inside the working chamber 101 and axially parallel to the intermediate shaft 6. The constraint plate 42 is fixed to the piston 2 and has a first sliding groove 421. The constraint plate 42 slides along the axial direction of the fixing pin 41 through the first sliding groove 421. Under the sliding cooperation of the first sliding groove 421 and the fixing pin 41, the piston 2 can be effectively circumferentially rotated and limited, preventing the piston 2 inside the intermediate shaft brake from rotating around its own circumference during operation. This prevents the piston 2 and its self-attached sealing ring 24 and other components from twisting and wearing, improving the durability and reliability of the seal and the performance of the brake.

[0040] In this embodiment, multiple sets of friction components 3 are arranged at intervals along the axial direction of the intermediate shaft 6, and the first friction plate 31 and the second friction plate 32 of the multiple sets of friction components 3 are arranged alternately along the axial direction of the intermediate shaft 6.

[0041] Specifically, the housing assembly 1 includes an outer shell 11 and an end plate 12. The end plate 12 is fixed to one end of the outer shell 11 and together with the outer shell 11 forms a working cavity 101. The intermediate shaft 6 passes through the opening of the end plate 12 and extends into the working cavity 101.

[0042] Specifically, the constraint piece 42 is provided with a snap-fit ​​connector 422, and the piston 2 is correspondingly provided with a snap-fit ​​groove 21. The snap-fit ​​connector 422 is fixedly snapped into the snap-fit ​​groove 21. The snap-fit ​​cooperation between the snap-fit ​​connector 422 and the snap-fit ​​groove 21 has a simple structure and achieves reliable fixation between the constraint piece 42 and the piston 2.

[0043] This embodiment is not limited to this; the fixing between the constraint piece 42 and the piston 2 can also be achieved through other methods such as threaded connection or plug-in connection.

[0044] Furthermore, the constraint piece 42 has a protruding head 423 protruding circumferentially, and a first groove 421 is correspondingly formed on the protruding head 423. The piston 2 has a corresponding groove 22. Specifically, the distance from the axis of the constraint piece 42 to the end of the protruding head 423 is greater than the radius of the piston 2, that is, the end of the protruding head 423 extends beyond the edge of the piston 2. The first groove 421 is formed at the end of the protruding head 423. When the constraint piece 42 is fixed to the piston 2, the middle part of the protruding head 423 is located in the corresponding groove 22, and the cooperation between the protruding head 423 and the groove 22 can further position the piston 2 and the constraint piece 42 for fixation.

[0045] In this embodiment, the constraint piece 42 has a through hole 424, and the constraint piece 42 is sleeved on the intermediate shaft 6 without contact through the through hole 424.

[0046] In this embodiment, multiple protrusions 423 are distributed circumferentially around the constraint piece 42, and the piston 2 is provided with grooves 22 corresponding to the protrusions 423 one by one.

[0047] Furthermore, the second friction plate 32 is provided with a second sliding groove 321, through which the second friction plate 32 can slide along the fixing pin 41. This arrangement ensures reliable movement of the second friction plate 32 along the axial direction of the intermediate shaft 6, while preventing the second friction plate 32 from rotating around its circumference, thus ensuring reliable and stable movement of the second friction plate 32. In this embodiment, the second friction plate 32 is sleeved on the intermediate shaft 6 and coaxially arranged with the intermediate shaft 6.

[0048] Specifically, multiple fixing pins 41 are evenly spaced along the axial direction of the intermediate shaft 6, and the first sliding groove 421 of the constraint piece 42 and the second sliding groove 321 of the second friction piece 32 are each corresponding to a fixing pin 41. This arrangement further ensures the directional movement of the second friction piece 32 along the axial direction of the intermediate shaft 6.

[0049] Furthermore, a spline groove 61 is formed on the outer peripheral wall of the end of the intermediate shaft 6 that extends into the working cavity 101, and a sleeve hole is formed on the first friction plate 31. A spline 311 corresponding to the spline groove 61 is formed on the inner peripheral wall of the sleeve hole. The cooperation between the spline groove 61 and the spline 311 can ensure the reliability and stability of the first friction plate 31 being fixedly sleeved on the intermediate shaft 6, and also prevent the first friction plate 31 from rotating around its own circumference.

[0050] In this embodiment, a sealing ring 24 is fixedly sleeved on the piston 2, and the sealing ring 24 fits against the inner wall of the working chamber 101. A nesting groove 26 is formed on the outer peripheral side of the piston 2, and the sealing ring 24 is fixedly embedded in the nesting groove 26.

[0051] In this embodiment, a main air groove 231 is provided on the side of the piston 2 facing away from the intermediate shaft 6. Multiple distribution air grooves 232 are provided along the circumference of the piston 2 on the outer edge of the main air groove 231. The distribution air grooves 232 are connected to the main air groove 231. The main air groove 231, the distribution air grooves 232 and the working chamber 101 together form the air chamber 102. When ventilation is provided to the air duct 111, the external air enters the main air groove 231 and also enters the multiple distribution air grooves 232 provided along the circumference of the outer edge of the main air groove 231. This arrangement can make the piston 2 evenly stressed, ensure the reliability of the piston 2's pushing force, avoid uneven stress on the piston 2 which would cause the sealing ring 24 and other components to twist and wear, and also avoid the sealing ring 24 from deviating from the axis of the intermediate shaft 6, thus ensuring the reliability of the seal.

[0052] Furthermore, a return spring 5 is also provided in the working chamber 101, located between the piston 2 and the intermediate shaft 6. The return spring 5 enables the piston 2 to always tend to move away from the intermediate shaft 6. Specifically, the intermediate shaft 6 has a receiving groove 62. One end of the return spring 5 facing the intermediate shaft 6 extends into the receiving groove 62 and abuts against the bottom of the groove 62. The end of the return spring 5 facing the piston 2 is fitted with a nested head 51. The piston 2 is correspondingly provided with a sleeve head 25. The end of the return spring 5 facing the piston 2 abuts against the sleeve head 25 on the piston 2 through the nested head 51.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An intermediate shaft brake, characterized in that, include: The housing assembly (1) has a working cavity (101), and an intermediate shaft (6) passes through the housing assembly (1) and extends into the working cavity (101); Piston (2) is movably disposed in the working chamber (101). The periphery of the piston (2) is attached to the inner wall of the working chamber (101). The side of the piston (2) facing away from the intermediate shaft (6) and the working chamber (101) together form an air chamber (102). The housing assembly (1) has an air duct (111) that communicates with the air chamber (102). The friction assembly (3) is located in the working chamber (101) and includes a first friction plate (31) and a second friction plate (32). The first friction plate (31) is fixed on the intermediate shaft (6). The piston (2) moves toward the intermediate shaft (6) and pushes the second friction plate (32) to press against the first friction plate (31). The constraint member (4) is disposed in the working cavity (101) and includes a fixing pin (41) and a constraint piece (42). The fixing pin (41) is fixed in the working cavity (101) and is arranged parallel to the axial direction of the intermediate shaft (6). The constraint piece (42) is fixed on the piston (2) and has a first sliding groove (421). The constraint piece (42) slides along the axial direction of the fixing pin (41) through the first sliding groove (421). The constraint piece (42) is provided with a snap-fit ​​connector (422), and the piston (2) is provided with a snap-fit ​​groove (21) accordingly. The snap-fit ​​connector (422) is fixedly snapped into the snap-fit ​​groove (21). The constraint piece (42) has a protruding head (423) protruding along its circumference, and the first groove (421) is correspondingly opened on the protruding head (423). The piston (2) has a groove (22) corresponding to the protruding head (423). A return spring (5) is also provided in the working chamber (101). The return spring (5) is located between the piston (2) and the intermediate shaft (6). The return spring (5) enables the piston (2) to always have a tendency to move away from the intermediate shaft (6). The intermediate shaft (6) has a receiving groove (62). One end of the return spring (5) facing the intermediate shaft (6) extends into the receiving groove (62) and abuts against the bottom of the receiving groove (62). One end of the return spring (5) facing the piston (2) is fitted with a nested head (51). The piston (2) is correspondingly provided with a sleeve head (25) corresponding to the nested head (51). One end of the return spring (5) facing the piston (2) abuts against the sleeve head (25) on the piston (2) through the nested head (51).

2. The intermediate shaft brake according to claim 1, characterized in that, The second friction plate (32) has a second sliding groove (321), and the second friction plate (32) can slide along the fixing pin (41) through the second sliding groove (321).

3. The intermediate shaft brake according to claim 2, characterized in that, The fixing pins (41) are evenly spaced along the axial direction of the intermediate shaft (6), and the first groove (421) of the constraint piece (42) and the second groove (321) of the second friction piece (32) are respectively set to correspond one-to-one with the fixing pins (41).

4. The intermediate shaft brake according to claim 1, characterized in that, The outer peripheral wall of the end of the intermediate shaft (6) that extends into the working cavity (101) is provided with a spline groove (61), and the first friction plate (31) is provided with a sleeve hole, and the inner peripheral wall of the sleeve hole is provided with a spline (311) corresponding to the spline groove (61).

5. The intermediate shaft brake according to claim 1, characterized in that, The piston (2) has a main gas groove (231) on the side opposite to the intermediate shaft (6). The outer edge of the main gas groove (231) has multiple gas distribution grooves (232) along the circumference of the piston (2). The gas distribution grooves (232) are connected to the main gas groove (231). The main gas groove (231), the gas distribution grooves (232) and the working chamber (101) together form the gas chamber (102).

6. The intermediate shaft brake according to claim 1, characterized in that, The piston (2) is fixedly fitted with a sealing ring (24), which is attached to the inner wall of the working chamber (101).

7. The intermediate shaft brake according to claim 1, characterized in that, The friction assembly (3) is provided in multiple sets at intervals along the axial direction of the intermediate shaft (6), and the first friction plate (31) and the second friction plate (32) of the multiple sets of friction assemblies (3) are alternately arranged along the axial direction of the intermediate shaft (6).

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