A transmission top cover assembly

Abstract

The application provides a gearbox top cover assembly, and belongs to the technical field of gearbox structure. The technical scheme is as follows: a gearbox top cover assembly comprises a top cover main body, a shift shaft is arranged in the top cover main body, a shift knob is fixedly connected to the shift shaft, a positioning block is fixed to the shift knob, a positioning groove one is formed in one side of the positioning block facing the inner wall of the top cover main body, a positioning hole one is formed in the inner wall of the top cover main body corresponding to the position of the positioning groove one, a hand feeling cylindrical pin and an elastic element are arranged in the positioning hole one, the hand feeling cylindrical pin is slidingly assembled in the positioning hole one, one end of the hand feeling cylindrical pin is in abutment with the elastic element, the other end of the hand feeling cylindrical pin is inserted into the positioning groove one, and the elastic element can continuously apply an elastic force to the hand feeling cylindrical pin to move towards the positioning groove one. The application has the beneficial effect that a strong feedback signal can be generated during gear shifting, helping the driver to accurately determine whether the gear shifting is completely in place.

Description

Technical Field

[0001] This application belongs to the field of gearbox structure technology, specifically relating to a gearbox top cover assembly. Background Technology

[0002] The gearbox top cover assembly is a core operating component of a commercial vehicle gearbox, directly responsible for transmitting and positioning gear shifting actions. Its structural design and performance are directly related to the driver's driving experience, gearbox operational stability, and overall vehicle driving safety. It serves as a crucial bridge connecting the driver's driving intentions with the gearbox actuators.

[0003] As shown in patent CN112065961A, existing gearbox top cover assemblies generally employ an operating structure that combines a gear selector shaft with a shift paddle. The gear selector shaft is directly fitted or simply supported within the top cover housing via bushings. The shift paddle is fixedly connected to the gear selector shaft by welding, pinning, or splines, achieving the core functions of axial movement for gear selection and rotational shifting. To assist operation, existing structures are equipped with basic spring components such as return springs and damping springs to achieve return after shifting or provide operating resistance.

[0004] However, during gear shifting, drivers can only perceive the elastic resistance of the spring or the frictional resistance between components. The feedback signal is weak and vague, failing to create a clear jolt to indicate that the gear shift is complete. This makes it difficult for drivers to accurately judge whether the gear shift is complete through tactile feedback, easily leading to operational problems such as incomplete gear shifting or misjudging the gear position. Minor issues may affect driving smoothness, while more serious problems may arise such as poor gear engagement, transmission system shocks, or even safety hazards due to improper gear engagement. Utility Model Content

[0005] This application addresses the problem of weak feedback signals during gear shifting, making it difficult to determine whether the shift is complete. It provides a gearbox top cover assembly that generates a strong feedback signal during gear shifting, helping the driver accurately judge whether the shift is complete.

[0006] To solve the above problems, the technical solution adopted in this application is a gearbox top cover assembly, including a top cover body, a shift shaft passing through the top cover body, a shift paddle fixedly connected to the shift shaft, a positioning block fixed on the shift paddle, a positioning groove being formed on the side of the positioning block facing the inner wall of the top cover body, a positioning hole being formed on the inner wall of the top cover body corresponding to the positioning groove, a tactile cylindrical pin and an elastic element being provided in the positioning hole, the tactile cylindrical pin being slidably assembled in the positioning hole, and one end of the tactile cylindrical pin abutting against the elastic element, and the other end being inserted into the positioning groove, the elastic element being able to continuously apply an elastic force to the tactile cylindrical pin to move towards the positioning groove.

[0007] In this technical solution, a shift shaft is installed inside the main body of the top cover, and a shift lever is fixedly connected to the shift shaft. A positioning block is fixed to the shift lever. A positioning groove is formed on the side of the positioning block facing the inner wall of the main body of the top cover. A positioning hole is formed on the inner wall of the main body of the top cover corresponding to the positioning groove. A tactile cylindrical pin and an elastic element are provided in the positioning hole. The tactile cylindrical pin is slidably assembled in the positioning hole, with one end of the tactile cylindrical pin abutting against the elastic element and the other end inserted into the positioning groove. The elastic element can continuously apply an elastic force to the tactile cylindrical pin, causing it to move towards the positioning groove. The existing structure disclosed in the prior art relies solely on friction between components or the elastic resistance of the basic spring to achieve gear selection and shifting, without setting a dedicated positioning and mating structure. This results in the driver only being able to perceive a weak resistance feedback and being unable to accurately judge whether the gear shift is in place. This technology utilizes the coordinated operation of an elastic element, a tactile cylindrical pin, and a positioning groove. The continuous elastic force applied by the elastic element ensures that the tactile cylindrical pin remains tightly engaged with the positioning groove. When the shift lever rotates with the shift shaft to shift gears, the positioning groove rotates synchronously with the positioning block. Its inner wall exerts a lateral force on the tactile cylindrical pin, forcing it to overcome the elastic force, slide along the positioning hole, and disengage from the positioning groove. During this process, the change in elastic force and the disengagement of the mechanical engagement create a distinct jolt, transmitting a strong feedback signal to the driver. When the shift is complete, the elastic force pushes the tactile cylindrical pin back into the positioning groove, again forming a clear engagement feedback. This helps the driver accurately judge whether the shift is complete, effectively solving the problem of weak feedback signals in existing structures.

[0008] Furthermore, the elastic element is a positioning spring. One end of the positioning spring abuts against the tactile cylindrical pin, and the other end is fixedly connected to a spring seat. The spring seat is embedded in the positioning hole and is fixedly connected to the inner wall of the positioning hole. The positioning spring ensures that the elastic force output of the elastic element is stable and controllable. The spring seat provides a stable mounting reference for the positioning spring, effectively preventing the positioning spring from shifting or wobbling within the positioning hole. This ensures that the positioning spring can continuously apply a stable elastic force to the tactile cylindrical pin, guaranteeing the reliable operation of the tactile feedback structure.

[0009] Furthermore, the cross-section of the first positioning groove is arc-shaped, and the radial width of the first positioning groove gradually increases from the bottom to the opening, with a continuous smooth curved surface transitioning between the bottom and the opening. The arc-shaped structure and the gradual width design make the process of the tactile cylindrical pin entering and exiting the first positioning groove smoother, avoiding jamming. The continuous smooth curved surface reduces frictional wear between the tactile cylindrical pin and the inner wall of the first positioning groove, extending the service life of the component. At the same time, it makes the shifting sensation smoother and clearer, improving the driving experience.

[0010] Furthermore, the shift paddle is equipped with a limiting bracket, which includes two vertical plates and one horizontal plate. The two vertical plates are slidably fitted onto the shift shaft and are respectively located on both sides of the shift paddle, closely fitting against it. The bottom of the two vertical plates is fixedly connected to the horizontal plate. A limiting hole is provided on the horizontal plate, the length direction of which is perpendicular to the axis of the shift shaft. The shift paddle passes through the limiting hole. Through the coordinated action of the vertical and horizontal plates, the limiting bracket can precisely constrain the movement direction of the shift paddle, preventing radial deviation during operation and ensuring that the shift paddle always moves along the set trajectory, thus improving the accuracy of the shifting action.

[0011] Furthermore, a limit block is fixed to the bottom of the cross plate. The limit block can be slidably fitted into the guide groove of the gearbox, and the extension direction of the guide groove of the gearbox is the same as the axial direction of the shift shaft. The cooperation between the limit block and the guide groove further enhances the positioning effect of the limit bracket, making the entire limit structure form a stable motion guide, effectively limiting the extra degrees of freedom of the shift paddle and shift shaft, reducing the shaking during the shifting process, and making the shifting action smoother and more reliable.

[0012] Furthermore, one end of the shift shaft passes through the top cover body and is fixedly connected to a rocker arm. A sealing oil seal is located on the side of the top cover body near the rocker arm. A dust cover is also provided on the top cover body, with one end fixedly connected to the top cover body and the other end fixedly connected to the shift shaft. An end cap is fixed to the side of the top cover body away from the rocker arm, and a sealing gasket is provided between the end cap and the top cover body. The sealing oil seal and the dust cover form a double protection, effectively preventing external dust and oil from entering the interior of the top cover body, avoiding contamination and wear of internal components. The cooperation between the end cap and the sealing gasket further improves the sealing performance of the top cover body. Simultaneously, the end cap also provides additional support for the shift shaft, enhancing structural stability.

[0013] Furthermore, a retaining ring is fixedly fitted onto the other end of the shift shaft. A positioning ring is provided on the outer side of the retaining ring, with a gap between the positioning ring and the retaining ring. The outer wall of the positioning ring is fixedly connected to the inner wall of the top cover body. A return spring one is provided on the side of the retaining ring near the end cover, and the return spring one is fitted onto the outside of the shift shaft. One end of the return spring one abuts against the end cover, and the other end abuts against the retaining ring. A return spring two is provided on the side of the retaining ring away from the end cover, and the return spring two is fitted onto the outside of the shift shaft. One end of the return spring two abuts against the top cover body, and the other end abuts against the retaining ring. The return spring one and the return spring two form a bidirectional elastic constraint through the retaining ring, which can quickly return the shift shaft to its initial position after the shifting action is completed, reducing the driver's operating burden. The bidirectional force design also makes the reset process smoother, avoiding impact or jamming when the shift shaft resets.

[0014] Furthermore, a second positioning groove is formed on the outer circumferential surface of the shift shaft, and a second positioning hole is formed on the inner wall of the top cover body corresponding to the second positioning groove. A second spring seat is fixed inside the second positioning hole, and a second positioning spring is installed inside the second spring seat. One end of the second positioning spring is fixedly connected to the second spring seat, and the other end faces the shift shaft and is fixed with a positioning ball. The positioning ball can be engaged in the second positioning groove. The cooperation between the second positioning groove and the positioning ball forms another set of positioning feedback structure, which can complement the feedback of the first positioning groove. Especially in multi-gear switching scenarios, it can provide differentiated tactile feedback for different gears, helping the driver to more clearly identify the current gear and further improve the accuracy of shifting operations.

[0015] Furthermore, an adjusting shim is provided between the second spring seat and the outer wall of the top cover body. The adjusting shim can be adjusted by increasing or decreasing its thickness or by changing its specifications to adjust the installation depth of the second spring seat in the second positioning hole, thereby changing the preload of the second positioning spring. This allows the engagement force between the positioning ball and the second positioning groove to be flexibly adjusted according to actual operating requirements, improving the product's adaptability and flexibility of use.

[0016] Furthermore, a vent plug is installed on the main body of the top cover, and the vent plug is connected to the internal cavity of the main body of the top cover. The vent plug can realize the air pressure balance between the inside and outside of the main body of the top cover, avoid damage to the seals caused by pressure differences due to temperature changes or component movement, and at the same time prevent external rainwater and dust from entering the interior through the air pressure difference, ensuring the normal working environment of the internal components of the top cover assembly.

[0017] As can be seen from the above technical solutions, the beneficial effects of this application are as follows: 1. Clear shift feedback: The interaction between the elastic element, the tactile cylindrical pin, and the positioning groove creates a distinct jolt, helping the driver to accurately judge whether the shift is complete.

[0018] 2. The gear shifting action is precise and smooth. The coordinated constraint of the limit bracket and the limit block effectively reduces the offset and shaking of the gear shifting components.

[0019] 3. Excellent protection and stability, with double sealing protection and vent plug design to ensure the working environment of internal components and extend service life.

[0020] 4. Highly adaptable, the bidirectional reset spring ensures smooth reset, and the adjusting pad allows for flexible adjustment of the locking force of the positioning structure. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of a specific embodiment of this application; Figure 2 This is a top view schematic diagram illustrating a specific embodiment of this application; Figure 3 This is a cross-sectional schematic diagram of the shift lever in a specific embodiment of this application; Figure 4 This is a schematic diagram of the limiting bracket in a specific embodiment of this application.

[0023] In the diagram: 1. Top cover body; 11. Positioning hole one; 12. Tactile cylindrical pin; 13. Positioning spring one; 14. Spring seat one; 15. Sealing oil seal; 16. Positioning hole two; 17. Spring seat two; 18. Positioning spring two; 19. Adjusting shim; 2. Shift shaft; 21. Positioning groove two; 3. Shift lever; 31. Positioning block; 32. Positioning groove one; 4. Limit bracket; 41. Vertical plate; 42. Horizontal plate; 43. Limiting hole; 44. Limiting block; 5. Rocker arm; 6. Dust cover; 7. End cover; 71. Sealing gasket; 8. Retaining ring; 81. Positioning ring; 82. Return spring one; 83. Return spring two; 9. Vent plug. Detailed Implementation

[0024] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0025] A gearbox top cover assembly, such as Figure 1-2 As shown, it includes a top cover body 1, which is a hollow box-shaped structure with an internal mounting cavity for accommodating various transmission components. Its outer wall is adapted to the gearbox housing, while its inner wall provides a mounting reference surface for each positioning component.

[0026] A shift shaft 2 is installed inside the mounting cavity of the top cover body 1. The shift shaft 2 is a cylindrical long shaft structure, and its axis is consistent with the length direction of the top cover body 1. The shift shaft 2 passes through both ends of the top cover body 1 and is in a rotatable assembly relationship with the top cover body 1, ensuring that the shift shaft 2 can rotate stably inside the top cover body 1 to realize the shifting action.

[0027] A shift paddle 3 is fixedly connected to the middle of the shift shaft 2. The shift paddle 3 is a block structure. One end of it is fixed to the shift shaft 2 by a fixing pin, so that the shift paddle 3 can rotate synchronously with the shift shaft 2. The other end of the shift paddle 3 extends to be adapted to the shift gear set inside the gearbox, so as to drive the gear to switch by rotating itself.

[0028] like Figure 3 As shown, a positioning block 31 is fixed on the side of the shift paddle 3 facing the inner wall of the top cover body 1. The positioning block 31 is a rectangular block structure, which is fixed to the side of the shift paddle 3 by bolts or integral molding. The height direction of the positioning block 31 is consistent with the height direction of the shift paddle 3, and a suitable installation gap is reserved between the top surface of the positioning block 31 and the inner wall of the top cover body 1.

[0029] A positioning groove 32 is provided on the side of the positioning block 31 facing the inner wall of the top cover body 1. The cross-section of the positioning groove 32 is arc-shaped, and its bottom is a smooth arc surface. From the bottom of the groove to the opening, the radial width of the positioning groove 32 gradually increases, forming an outwardly expanding groove structure. The bottom of the groove and the opening are connected by a continuous smooth curved surface without any sharp corners or steps, ensuring that the mating parts can smoothly enter and exit the groove.

[0030] On the inner wall of the top cover body 1, a positioning hole 11 is provided at the position corresponding to the positioning groove 32. The positioning hole 11 is a cylindrical through hole, and its axial direction is consistent with the groove depth direction of the positioning groove 32. The diameter of the positioning hole 11 is adapted to the outer diameter of the subsequent assembled parts, and the hole wall is precision machined to ensure sliding accuracy.

[0031] The positioning hole 11 is equipped with a tactile cylindrical pin 12 and an elastic element. The tactile cylindrical pin 12 is a smooth cylindrical structure with a clearance fit between its outer diameter and the diameter of the positioning hole 11, allowing the tactile cylindrical pin 12 to slide smoothly along the axial direction within the positioning hole 11. The elastic element is a positioning spring 13, which is a helical compression spring with an outer diameter slightly smaller than the diameter of the positioning hole 11, ensuring stable expansion and contraction within the hole.

[0032] A spring seat 14 is also embedded in the positioning hole 11. The spring seat 14 is a cylindrical sleeve structure with one end closed. Its outer wall is fixedly connected to the hole wall of the positioning hole 11 by a threaded connection, so that the spring seat 14 forms a stable installation reference in the positioning hole 11. One end of the positioning spring 13 is embedded in the closed end of the spring seat 14 and fixedly connected to the spring seat 14. The other end abuts against one end of the tactile cylindrical pin 12. The other end of the tactile cylindrical pin 12 extends out of the positioning hole 11 and is inserted into the positioning groove 32. The positioning spring 13 is in a slightly compressed state in its natural state, which can continuously apply an elastic force to the tactile cylindrical pin 12 to move towards the positioning groove 32, ensuring that the two always maintain a stable fit.

[0033] like Figure 4 As shown, a limiting bracket 4 is also provided on the outside of the shift paddle 3. The limiting bracket 4 consists of two vertical plates 41 and one horizontal plate 42, forming a U-shaped structure. Both vertical plates 41 are rectangular plate structures with their surfaces perpendicular to the axis of the shift shaft 2. Each vertical plate 41 has a through hole that matches the outer diameter of the shift shaft 2. The vertical plates 41 are slidably fitted onto the shift shaft 2 through the through hole, allowing them to slide along the axis of the shift shaft 2. The two vertical plates 41 are symmetrically arranged on both sides of the shift paddle 3, and the inner sidewalls of the vertical plates 41 are tightly fitted to the side of the shift paddle 3 without any obvious gap, thus providing lateral constraint to the shift paddle 3.

[0034] The bottoms of the two vertical plates 41 are fixedly connected to the horizontal plate 42. The horizontal plate 42 is a rectangular plate structure adapted to the width of the two vertical plates 41, and its surface is parallel to the radial direction of the shift shaft 2. The two ends of the horizontal plate 42 are fixed to the bottoms of the two vertical plates 41 by welding or bolts, forming an integrated limiting bracket 4 structure. A limiting hole 43 is opened in the middle of the horizontal plate 42. The limiting hole 43 is a rectangular hole, the length of which is perpendicular to the axial direction of the shift shaft 2, and the width of which is adapted to the thickness of the shift lever 3. The end of the shift lever 3 away from the shift shaft 2 passes through the limiting hole 43, so that the movement of the shift lever 3 can be guided and constrained by the limiting hole 43.

[0035] A limiting block 44 is fixed at the bottom of the horizontal plate 42. The limiting block 44 is a cylindrical or rectangular block structure, and its top surface is fixedly connected to the bottom surface of the horizontal plate 42 by welding or bolts. The axial direction of the limiting block 44 is consistent with the length direction of the horizontal plate 42. The limiting block 44 can be slidably assembled in the guide groove of the gearbox. The guide groove is an elongated groove opened on the gearbox housing, and its extension direction is the same as the axial direction of the shift shaft 2. The outer diameter or width of the limiting block 44 is clearance-fitted with the groove width of the guide groove to ensure that the limiting block 44 can slide smoothly along the guide groove.

[0036] One end of the shift shaft 2 passes through the side wall of the top cover body 1 and extends to the outside. A rocker arm 5 is fixedly connected to the extended end. The rocker arm 5 is a bent plate-shaped structure. One end of the rocker arm 5 is provided with a connection hole that matches the end of the shift shaft 2. It is fixed to the shift shaft 2 by a key or a set screw, so that the rocker arm 5 can drive the shift shaft 2 to rotate synchronously. The other end of the rocker arm 5 is used to connect to the shift lever to transmit the driver's operating force.

[0037] A sealing oil seal 15 is provided on the side of the top cover body 1 near the rocker arm 5. The sealing oil seal 15 has a ring structure. Its inner ring is tightly fitted on the outer circumference of the shift shaft 2, and its outer ring is embedded in the oil seal mounting groove opened on the side wall of the top cover body 1. The lip of the sealing oil seal 15 is tightly fitted with the surface of the shift shaft 2 to achieve a seal between the shift shaft 2 and the top cover body 1.

[0038] A dust cover 6 is provided on the outer side of the top cover body 1 corresponding to the extended end of the shift shaft 2. The dust cover 6 is a flexible telescopic sleeve structure. One end of it is fixedly connected to the outer wall of the top cover body 1 by a clamp or bolt, and the other end is also fixedly connected to the outer circumferential surface of the shift shaft 2 by a clamp. The dust cover 6 completely covers the extended part of the shift shaft 2 and the sealing oil seal 15 to form a dust protection.

[0039] An end cap 7 is fixed on the side of the top cover body 1 away from the rocker arm 5. The end cap 7 is a cover plate structure adapted to the end opening of the top cover body 1. It is fixedly connected to the end face of the top cover body 1 by multiple circumferentially evenly distributed bolts to close the mounting cavity of the top cover body 1. A sealing gasket 71 is provided between the end cap 7 and the top cover body 1. The sealing gasket 71 is an annular thin sheet made of rubber or asbestos, and its shape is consistent with the contour of the end face of the top cover body 1. The sealing gasket 71 is sandwiched between the end cap 7 and the top cover body 1, and the sealing between the two is achieved by the tightening force of the bolts.

[0040] A retaining ring 8 is fixedly fitted at the other end of the shift shaft 2 away from the rocker arm 5. The retaining ring 8 is an elastic retaining ring 8 or a shaft retaining ring 8. It is positioned by the retaining ring 8 groove opened on the shift shaft 2. The outer diameter of the retaining ring 8 is larger than the outer diameter of the shift shaft 2, and the end face of the retaining ring 8 is perpendicular to the axis of the shift shaft 2, forming an axial limiting structure.

[0041] A positioning ring 81 is provided on the outside of the retaining ring 8. The positioning ring 81 is an annular structure with an inner diameter larger than the outer diameter of the retaining ring 8, so that there is a uniform annular gap between the positioning ring 81 and the retaining ring 8 to avoid interference between the two. The outer wall of the positioning ring 81 is fixedly connected to the inner wall of the top cover body 1 by welding or interference fit to form a fixed installation reference.

[0042] A return spring 82 is provided on the side of the retaining ring 8 near the end cover 7. The return spring 82 is a helical compression spring, which is sleeved on the outside of the shift shaft 2. One end of the return spring 82 abuts against the inner wall of the end cover 7, and the other end abuts against the end face of the retaining ring 8. Under normal conditions, it is in a slightly compressed state. A return spring 83 is provided on the side of the retaining ring 8 away from the end cover 7. The return spring 83 is also a helical compression spring, which is sleeved on the outside of the shift shaft 2. One end of the return spring 83 abuts against the inner wall of the top cover body 1, and the other end abuts against the other end face of the retaining ring 8. Together with the return spring 82, it forms a bidirectional elastic constraint.

[0043] On the outer circumferential surface of the shift shaft 2, a positioning groove 21 is provided near the positioning ring 81. The positioning groove 21 is an annular groove or multiple spaced grooves corresponding to the shift gear. Its groove depth and groove width are adapted to the positioning ball to realize the positioning of the shift gear.

[0044] On the inner wall of the top cover body 1, a positioning hole 16 is provided at the position corresponding to the positioning groove 21. The positioning hole 16 is a cylindrical through hole, and its axial direction is consistent with the radial direction of the shift shaft 2. The hole diameter is slightly larger than the outer diameter of the subsequent assembly parts to facilitate the installation of the parts.

[0045] A spring seat 17 is fixed inside the positioning hole 16. The spring seat 17 is a cylindrical sleeve structure. Its outer wall is fixedly connected to the hole wall of the positioning hole 16 by a threaded connection. One end of the spring seat 17 extends to the outer side of the outer wall of the top cover body 1, and the other end extends to a position close to the shift shaft 2, forming a spring mounting cavity.

[0046] The second spring seat 17 is equipped with a second positioning spring 18, which is a helical compression spring. One end of the positioning spring 18 is embedded in the bottom of the second spring seat 17 and is fixedly connected to the second spring seat 17. The other end faces the shift shaft 2 and is fixedly connected to a positioning ball. The positioning ball is a smooth steel ball with a diameter larger than the outer diameter of the second positioning spring 18. The end of the positioning ball away from the second positioning spring 18 is in contact with the outer circumferential surface of the shift shaft 2 and can be engaged in the positioning groove 21 under the action of the second positioning spring 18.

[0047] An adjusting pad 19 is provided between the spring seat 2 17 and the outer wall of the top cover body 1. The adjusting pad 19 is a ring-shaped thin sheet structure, and its material is metal or hard rubber. The adjusting pad 19 is sleeved on the outer periphery of the spring seat 2 17 and sandwiched between the end face of the spring seat 2 17 and the outer wall of the top cover body 1. By increasing or decreasing the number of adjusting pads 19 or replacing adjusting pads 19 of different thicknesses, the installation depth of the spring seat 2 17 in the positioning hole 2 16 can be adjusted.

[0048] A vent plug 9 is installed on the top or side wall of the top cover body 1. The vent plug 9 is a standard venting component, which includes a threaded connection and a venting core. The top cover body 1 has an installation hole that is threaded to fit the vent plug 9. The vent plug 9 is fixed to the top cover body 1 through the threaded connection. The venting core is connected to the internal cavity of the top cover body 1 to achieve internal and external air pressure balance.

[0049] Work process: When the driver performs gear selection, the operating force drives the shift shaft 2 to move along its own axis. At this time, the positioning groove 21 on the outer circumference of the shift shaft 2 slides axially synchronously with the shift shaft 2. The positioning ball in the positioning hole 16 is always in contact with the outer circumference of the shift shaft 2 under the elastic force of the positioning spring 18. When the shift shaft 2 moves to the middle position corresponding to neutral, the positioning ball is exactly aligned with the positioning groove 21 and is engaged in the positioning groove 21 under the push of the positioning spring 18, forming a clear engagement feel and feeding back to the driver that the gear selection has returned to the neutral middle position. If it is necessary to switch to other gear selection positions, the driver continues to apply axial force, and the shift shaft 2 drives the positioning groove 21 to move. The inner wall of the positioning groove 21 squeezes the positioning ball, forcing the positioning ball to overcome the elastic force of the positioning spring 18 and retract into the positioning hole 16, disengaging from the positioning groove 21, until it moves to the target gear selection position. During the entire gear selection process, the adjusting shim 19 can adjust the preload of the positioning spring 18 to ensure that the engagement feel of the positioning ball is stable and moderate.

[0050] After selecting a gear, the driver applies rotational force to the rocker arm 5. The rocker arm 5 drives the shift shaft 2 to rotate within the top cover body 1. The shift paddle 3, connected by a fixed pin, rotates synchronously with the shift shaft 2, thereby driving the internal gearbox shift gear set to switch gears. When the shift paddle 3 rotates, the positioning block 31 fixed on its side moves in a circular motion. The positioning groove 32 rotates with the positioning block 31 and moves relative to the tactile cylindrical pin 12 in the positioning hole 11. Under the continuous elastic force of the positioning spring 13, the tactile cylindrical pin 12 remains in contact with the inner wall of the positioning groove 32. The outwardly expanding arc-shaped surface of the positioning groove 32 generates a lateral pushing force on the tactile cylindrical pin 12, forcing the tactile cylindrical pin 12 to overcome the elastic force of the positioning spring 13 and slide away from the positioning groove 32 along the positioning hole 11 until it is completely disengaged from the positioning groove 32. During this process, the change in elastic force and the mechanical engagement and disengagement create a noticeable jerking sensation, transmitting a feedback signal for starting the shift.

[0051] During gear shifting, the limiting bracket 4 functions simultaneously: two vertical plates 41 slide along the shift shaft 2, the horizontal plate 42 constrains the movement trajectory of the shift paddle 3 through the limiting hole 43, and the limiting block 44 at the bottom of the horizontal plate 42 slides smoothly along the gearbox guide groove, effectively preventing radial offset or wobbling of the shift paddle 3 and the shift shaft 2, ensuring precise and controllable shifting action. When the shift shaft 2 rotates to the target gear position, the positioning groove 32 corresponding to the gear on the positioning block 31 rotates precisely to align with the tactile cylindrical pin 12, and the positioning spring 13 pushes the tactile cylindrical pin 12 to re-insert into the positioning groove 32, forming a clear engagement and snapping sensation again, informing the driver that the shift is complete.

[0052] After shifting gears, the driver releases the steering force, and the return springs 82 and 83 on both sides of the shift ring 8 release their elastic potential energy. Through the support of the positioning ring 81, they generate a bidirectional elastic thrust on the shift ring 8, causing the shift shaft 2 to quickly return to its initial rotational position, preparing for the next shift. Throughout the entire operation, the sealing oil seal 15 and the dust cover 6 form a double protection, preventing external dust and oil from entering the interior of the top cover body 1. The vent plug 9 balances the internal and external air pressure in real time to prevent pressure differences from damaging the seals. The end cover 7 and the sealing gasket 71 further enhance the sealing performance and provide support for the shift shaft 2, ensuring the long-term stable operation of all components.

[0053] As can be seen from the above embodiments, the beneficial effects of this application are as follows: 1. Clear shift feedback: The interaction between the elastic element, the tactile cylindrical pin, and the positioning groove creates a distinct jolt, helping the driver to accurately judge whether the shift is complete.

[0054] 2. The gear shifting action is precise and smooth. The coordinated constraint of the limit bracket and the limit block effectively reduces the offset and shaking of the gear shifting components.

[0055] 3. Excellent protection and stability, with double sealing protection and vent plug design to ensure the working environment of internal components and extend service life.

[0056] 4. Highly adaptable, the bidirectional reset spring ensures smooth reset, and the adjusting pad allows for flexible adjustment of the locking force of the positioning structure.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gearbox top cover assembly, comprising a top cover body (1), a shift shaft (2) passing through the top cover body (1), and a shift lever (3) fixedly connected to the shift shaft (2), characterized in that, A positioning block (31) is fixed on the shift knob (3). A positioning groove (32) is provided on the side of the positioning block (31) facing the inner wall of the top cover body (1). A positioning hole (11) is provided on the inner wall of the top cover body (1) corresponding to the positioning groove (32). A tactile cylindrical pin (12) and an elastic element are provided in the positioning hole (11). The tactile cylindrical pin (12) is slidably assembled in the positioning hole (11). One end of the tactile cylindrical pin (12) abuts against the elastic element, and the other end is inserted into the positioning groove (32). The elastic element can continuously apply an elastic force to the tactile cylindrical pin (12) to move toward the positioning groove (32).

2. The transmission top cover assembly of claim 1, wherein, The elastic element is a positioning spring (13). One end of the positioning spring (13) abuts against the tactile cylindrical pin (12), and the other end is fixedly connected to the spring seat (14). The spring seat (14) is embedded in the positioning hole (11), and the spring seat (14) is fixedly connected to the inner wall of the positioning hole (11).

3. The transmission top cover assembly of claim 2, wherein, The cross-section of the positioning groove (32) is arc-shaped. The radial width of the positioning groove (32) gradually increases from the bottom to the opening. The bottom and opening of the positioning groove (32) are connected by a continuous smooth curved surface.

4. The transmission top cover assembly of claim 1, wherein, The shift paddle (3) is provided with a limiting bracket (4). The limiting bracket (4) includes two vertical plates (41) and a horizontal plate (42). The two vertical plates (41) are slidably sleeved on the shift shaft (2) and are respectively located on both sides of the shift paddle (3) and are in close contact with the shift paddle (3). The bottom of the two vertical plates (41) are fixedly connected to the horizontal plate (42). A limiting hole (43) is opened on the horizontal plate (42). The length direction of the limiting hole (43) is perpendicular to the axial direction of the shift shaft (2). The shift paddle (3) passes through the limiting hole (43).

5. The gearbox top cover assembly according to claim 4, characterized in that, A limiting block (44) is fixed at the bottom of the horizontal plate (42). The limiting block (44) can be slidably assembled in the guide groove of the gearbox. The extension direction of the guide groove of the gearbox is the same as the axial direction of the shift shaft (2).

6. The transmission top cover assembly of claim 1, wherein, One end of the shift shaft (2) passes through the top cover body (1) and is fixedly connected to the rocker arm (5). The top cover body (1) is provided with a sealing oil seal (15) on the side near the rocker arm (5). The top cover body (1) is provided with a dust cover (6). One end of the dust cover (6) is fixedly connected to the top cover body (1), and the other end is fixedly connected to the shift shaft (2). The top cover body (1) is fixed with an end cover (7) on the side away from the rocker arm (5). A sealing gasket (71) is provided between the end cover (7) and the top cover body (1).

7. The transmission top cover assembly of claim 6, wherein, A retaining ring (8) is fixedly fitted on the other end of the shift shaft (2). A positioning ring (81) is provided on the outside of the retaining ring (8). There is a gap between the positioning ring (81) and the retaining ring (8). The outer wall of the positioning ring (81) is fixedly connected to the inner wall of the top cover body (1). A return spring (82) is provided on the side of the retaining ring (8) near the end cover (7). The return spring (82) is fitted on the outside of the shift shaft (2). One end of the return spring (82) abuts against the end cover (7), and the other end abuts against the retaining ring (8). A return spring (83) is provided on the side of the retaining ring (8) away from the end cover (7). The return spring (83) is fitted on the outside of the shift shaft (2). One end of the return spring (83) abuts against the top cover body (1), and the other end abuts against the retaining ring (8).

8. The transmission top cover assembly of claim 1, wherein, A positioning groove 2 (21) is provided on the outer circumferential surface of the shift shaft (2). A positioning hole 2 (16) is provided on the inner wall of the top cover body (1) corresponding to the position of the positioning groove 2 (21). A spring seat 2 (17) is fixed in the positioning hole 2 (16). A positioning spring 2 (18) is provided in the spring seat 2 (17). One end of the positioning spring 2 (18) is fixedly connected to the spring seat 2 (17), and the other end faces the shift shaft (2) and is fixed with a positioning ball. The positioning ball can be engaged in the positioning groove 2 (21).

9. The transmission top cover assembly of claim 8, wherein, An adjusting pad (19) is provided between the spring seat 2 (17) and the outer wall of the top cover body (1).

10. The transmission top cover assembly of claim 1, wherein, A vent plug (9) is fitted on the top cover body (1), and the vent plug (9) is connected to the internal cavity of the top cover body (1).

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