Transmission gear shifting brake device

Abstract

The utility model relates to a transmission gear shifting brake device which comprises a transmission shell and an intermediate shaft, and a brake concave portion 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 a plurality of 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] This utility model relates to a transmission shifting braking device. Background Technology

[0002] Chinese patent CN202010174847.7 discloses a movable wedge block shifting mechanism. Compared with other shifting mechanisms with the same function, this mechanism can significantly reduce the size of the transmission, reduce the clamping force required to clamp the shifting elements, and reduce cost and energy loss. However, it also has shortcomings such as excessive wear between the mating plate and the carrier plate, and between the support plate and the elastomer baffle when shifting at high speed and high speed ratio. At the same time, it requires the mating plate, carrier plate, support plate and elastomer baffle to have large dimensions, especially large radial dimensions. Therefore, there is still room for improvement in terms of volume, cost and energy consumption. Utility Model Content

[0003] This utility model addresses the problems existing in the prior art by providing a transmission shifting braking device.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a transmission shifting braking device, including a transmission housing and an intermediate shaft disposed within the transmission housing, wherein a braking recess is provided on the outer periphery of the intermediate shaft; a braking block is provided on the periphery of the transmission housing, wherein the braking block 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.

[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 brake recess is a brake hole, the outer end of the brake 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 and second blocking surfaces are distributed opposite to each other on both sides of the brake block periphery.

[0007] Furthermore, it also includes a brake housing fixedly mounted on the transmission housing, the actuator being disposed within the brake housing, the actuator including a piston chamber and a piston disposed within the piston chamber, the inner end of the piston being fixedly connected to the brake block.

[0008] Furthermore, a return chamber is provided at the outer end of the piston chamber, and the return chamber is connected to the piston chamber to form a stepped chamber. The inner diameter of the return chamber is larger than the inner diameter of the piston chamber. A return disc is provided at the outer end of the piston. The brake block, piston, and return disc form an integral piston assembly. The return disc is located in the return chamber and is in clearance fit with the inner wall of the return chamber to facilitate gas flow. A return spring is provided between the return disc and the brake housing, sleeved on the outside of the piston. One end of the return spring abuts against the return disc, and the other end abuts against the stepped wall of the stepped chamber.

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

[0010] Furthermore, the cavity cover is provided with one or more anti-rotation pins; the return plate is provided with one or more anti-rotation holes, and the anti-rotation pins are inserted into the anti-rotation holes; the outer end face of the return plate is provided with a partially protruding contact surface to prevent the return plate from sticking to 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 gear ring or sun gear of a planetary gear set.

[0013] Compared with the prior art, the present invention has the following advantages: The present invention has a simple and reasonable structure, fewer parts, and can be realized by simple traditional processing technology. Braking only requires one element and one device. In most transmissions, it can replace the one-way overrunning clutch and multiple sets of friction plates to realize braking and one-way functions. It is extremely small in size and has extremely low cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present utility model;

[0015] Figure 2 yes Figure 1 Enlarged diagram of point A in the diagram;

[0016] Figure 3 This is a three-dimensional structural schematic diagram of the piston assembly in an embodiment of this utility model;

[0017] Figure 4 This is a partially enlarged schematic diagram of the intermediate shaft in an embodiment of this utility model;

[0018] Figure 5 This is a three-dimensional structural diagram of the intermediate shaft in an embodiment of this utility model.

[0019] In the picture:

[0020] 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 shaft; 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 disc; 13-Piston assembly; 14-Return spring; 15-Cavity cover; 16-Air inlet / outlet; 17-Anti-rotation pin; 18-Anti-rotation hole; 19-Contact surface. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 this utility model.

[0023] like Figures 1-5 As shown, this utility model discloses a transmission shifting braking device, including a transmission housing 1 and an intermediate shaft 2 coaxially disposed within the transmission housing 1. The outer periphery of the intermediate shaft 2 is provided with one or more braking recesses, which are evenly distributed along the outer periphery of the intermediate shaft. The transmission housing 1 is provided with a brake block 3 around its periphery. The brake block 3 is driven by an actuator 4 to move in a direction perpendicular to the transmission axis 5 and wedge into the braking recess to block the rotation of the intermediate shaft 2.

[0024] In this embodiment, as Figure 3 As shown, the inner end of the brake block 3 is provided with a first inclined surface 301 that slopes 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 transmission axis 5, and a second blocking surface 303 along the positive rotation direction of the transmission axis. The first blocking surface 301 and the second blocking surface 302 are distributed opposite to each other on both sides of the periphery of the brake block 3. The brake recess is a brake hole or a brake groove; preferably, it is a brake hole. Figure 4As shown, the braking recess is a brake hole 6, which corresponds to the position of the brake block 3. The outer end of the brake hole 6 is provided with a second inclined surface 601 that protrudes outward and slopes, corresponding to the first inclined surface 301. The periphery of the brake 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 brake block is wedged into the brake hole, if the intermediate shaft is in a reverse (counterclockwise) state, the second blocking surface of the brake block and the fourth blocking surface of the brake hole contact each other, preventing the intermediate shaft from rotating. If the intermediate shaft is in a forward (clockwise) state, the first blocking surface of the brake block and the third blocking surface of the brake hole contact each other, preventing the intermediate shaft from rotating.

[0025] In this embodiment, a brake housing 7 is also included, which is fixedly disposed in the transmission housing 1. The brake housing is fixedly connected to the transmission housing, or the brake housing is integrated with the transmission housing. The actuator 4 is disposed inside the brake housing 7.

[0026] In this embodiment, the actuator 4 can be a pneumatic piston device, a hydraulic piston device, a lead screw device, an electromagnetic clutch device, etc., preferably a pneumatic piston device. Specifically, the actuator 4 includes a piston chamber 8 and a piston 9 disposed in the piston chamber 8. A sealing ring 10 is provided on the inner circumference of the piston chamber 8 or the outer circumference 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.

[0027] In this embodiment, a return cavity 11 is provided at the outer end of the piston chamber 8. The return cavity 11 is connected to the piston chamber 8 and forms a stepped cavity. The inner diameter of the return cavity 11 is larger than the inner diameter of the piston chamber 8. A return disk 12 is provided at the outer end of the piston 9. 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 disposed in the return cavity 11 and has a clearance fit with the inner wall of the return cavity 11 to facilitate gas flow. A return spring 14 is provided between the return disk 12 and the brake housing 7, sleeved on the outside of the piston 9. One end of the return spring 14 abuts against the return disk 12, and the other end abuts against the stepped wall of the stepped 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, the friction between the intermediate shaft and the brake block is small and can be ignored, and does not affect the relative rotation of the intermediate shaft and the brake block.

[0028] In this embodiment, a cavity cover 15 is provided at the outer end of the return cavity 11. The cavity cover 15 is provided with an inlet and outlet port 16 for compressed gas to enter and exit. The cavity cover is sealed and fixedly connected to the brake housing. Preferably, the inlet and outlet port is connected to a solenoid valve, and the inlet and outlet of gas are controlled by the solenoid valve.

[0029] In this embodiment, the cavity cover 15 is provided with one or more anti-rotation pins 17; the return plate 12 is provided with one or more anti-rotation holes 18, the anti-rotation holes are positioned corresponding to the anti-rotation pins, and the anti-rotation pins 17 are inserted into the anti-rotation holes 18 to achieve the purpose of placing the piston to rotate.

[0030] In this embodiment, a partially protruding contact surface 19 is provided on one of the surfaces opposite to the return disk 12, to prevent the cavity cover from adhering to the return disk. Preferably, the partially protruding contact surface 19 is provided on the outer end face of the return disk 12.

[0031] 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.

[0032] In this embodiment, the intermediate shaft 2 is the gear ring or sun gear of the planetary gear set.

[0033] In this embodiment, let the radial cross-sectional area of ​​the piston be S1, the radial cross-sectional area of ​​the return plate be S2, and the contact area between the return spring and the return plate be S3. Then the effective working cross-sectional area of ​​the piston is S = S1 + S3. Without considering frictional resistance, if the stable air pressure after the piston chamber is vented is P, and the spring force of the return spring is N, then the force on the piston after stabilization is F = PS - N = P(S1 + S3) - N.

[0034] The working method of the transmission shift braking device includes the following:

[0035] (1) Initial state: The piston chamber is under 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 is separated from the intermediate shaft.

[0036] (2) During braking: The piston chamber is filled with air, and the piston assembly moves towards the intermediate shaft under the action of air pressure, overcoming the spring force of the return spring. At this time, there are two possible positions of the brake block and the intermediate shaft: one is that the brake block is wedged into the brake hole of the intermediate shaft. In this case, if the intermediate shaft is reversed, the second blocking surface of the brake block and the fourth blocking surface of the brake hole will contact each other and block each other, and the intermediate shaft will no longer rotate; if the intermediate shaft is rotated forward, the first blocking surface of the brake block and the third blocking surface of the brake hole will contact each other and block each other, and the intermediate shaft will no longer rotate; the other is that the inner end of the brake block is pressed against the protruding part of the intermediate shaft. In this case, if the intermediate shaft is reversed, the intermediate shaft and the brake block will rotate relative to each other, and the brake block will slide across the outer circumferential surface of the intermediate shaft. Until the inner end of the brake block weds into the brake hole of the intermediate shaft, the second blocking surface of the brake block and the fourth blocking surface of the brake hole come into contact and block each other, and the intermediate shaft stops rotating and is braked. If the intermediate shaft rotates clockwise, the intermediate shaft and the brake block rotate relative to each other, and the brake block slides across the outer circumferential surface of the intermediate shaft until the inner end of the brake block weds into the brake hole of the intermediate shaft, and the first blocking surface of the brake block and the third blocking surface of the brake hole come into contact and block each other, and the intermediate shaft also stops rotating. Since the thrust of the piston assembly only needs to overcome the spring force of the return spring, when the friction between the intermediate shaft and the brake block is small, it can be ignored and does not affect the relative rotation between the intermediate shaft and the brake block.

[0037] (3) Shifting from braking to separation: During the forward operation of the transmission, the pressure of the compressed gas in the piston chamber gradually decreases. Under the action of the return spring, the brake block gradually leaves the brake hole of the intermediate shaft. When the brake block retracts a certain amount, the intermediate shaft rotates forward. At this time, the first inclined surface of the brake block contacts the second inclined surface of the brake hole. The axial component of the force exerted by the second inclined surface of the brake hole on the first inclined surface of the inner end of the brake block causes the brake block to accelerate backward. When the intermediate shaft rotates to the point where the convex surface of the non-brake hole contacts the brake block, the intermediate shaft and the brake block rotate relative to each other until the brake block separates from the intermediate shaft, thus the braking device is in a disengaged state.

[0038] (4) Shifting from separation to braking: During the forward operation of the transmission, the pressure of the compressed gas in the piston chamber gradually increases and overcomes the force of the return spring. The piston assembly pushes the brake block close to and contacts the intermediate shaft. The subsequent process is the same as step (2), thereby realizing the shifting from separation to braking.

[0039] The advantages of this utility model are:

[0040] (1) The braking device has few parts and a simple structure. It can be realized by simple traditional processing technology. One braking element and one device are sufficient. In most transmissions, it can replace the one-way overrunning clutch and multiple sets of friction plates to realize braking and one-way functions. It is extremely small in size and has very low cost.

[0041] (2) This structure has low requirements for actuator power but high braking force and flexible application. By appropriately increasing the size of the brake block, the braking capacity can be increased. Therefore, one braking device can be applied to multiple specifications of transmissions, which is conducive to increasing batch size and further reducing manufacturing costs.

[0042] (3) Since the thrust required to push the brake block is very small, the frictional force is very small when the intermediate shaft rubs against the brake block, the frictional energy loss can be ignored, and the wear of the brake block and the intermediate shaft can also be ignored. Therefore, the device has good reliability and low processing requirements.

[0043] (4) No additional friction plates are required, resulting in less energy loss due to oil stirring and less risk of overheating of the transmission;

[0044] (5) Without additional friction plates, the amount of wear debris generated during the sliding process is reduced accordingly, which helps to keep the lubricating oil in the transmission clean and reduces failures caused by lubricating oil contamination;

[0045] (6) Without additional friction plates, the inertia during gear shifting is reduced, which is more conducive to improving shifting speed and smoothness.

[0046] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0047] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0048] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

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

2. The transmission shifting braking device according to claim 1, characterized in that: The first and second blocking surfaces are distributed opposite to each other on both sides of the brake block periphery.

3. The transmission shifting braking device according to claim 1, characterized in that: It also includes a brake housing fixedly mounted on the transmission housing, the actuator being disposed within the brake housing, the actuator including a piston chamber and a piston disposed within the piston chamber, the inner end of the piston being fixedly connected to the brake block.

4. A transmission shifting braking device according to claim 3, characterized in that: A return chamber is provided at the outer end of the piston chamber. The return chamber is connected to the piston chamber and forms a stepped chamber. The inner diameter of the return chamber is larger than the inner diameter of the piston chamber. A return disc is provided at the outer end of the piston. The brake block, piston, and return disc form an integral piston assembly. The return disc is located in the return chamber and is in clearance fit with the inner wall of the return chamber to facilitate gas flow. A return spring is provided between the return disc and the brake housing and is sleeved on the outside of the piston. One end of the return spring abuts against the return disc and the other end abuts against the stepped wall of the stepped chamber.

5. A transmission shifting braking device according to claim 4, characterized in that: The outer end of the return cavity is provided with a cavity cover, and the cavity cover is provided with an inlet and outlet for compressed gas.

6. A transmission shifting braking device according to claim 5, characterized in that: The cavity cover is provided with one or more anti-rotation pins; the return plate is provided with one or more anti-rotation holes, and the anti-rotation pins are inserted into the anti-rotation holes; the outer end face of the return plate is provided with a partially protruding contact surface to prevent the return plate from sticking to the cavity cover.

7. A transmission shifting braking device according to claim 1, characterized in that: The axis of the brake block and the axis of the brake hole are perpendicular to the axis of the transmission, and the axis of the intermediate shaft coincides with the axis of the transmission.

8. A transmission shifting braking device according to claim 1, characterized in that: The intermediate shaft is either the gear ring or the sun gear of a planetary gear set.

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