Gearbox top cover structure for transport vehicle

Abstract

The utility model discloses a gearbox top cover structure for a transport vehicle, which relates to the technical field of gearboxes, and comprises a top cover, a gear selecting mechanism is mounted on one side of the top cover, the gear selecting mechanism is connected with a gear shifting mechanism, the gear shifting mechanism is mounted in the top cover, the gear selecting mechanism comprises a gear selecting shaft, the gear selecting shaft is connected with a gear selecting rocker arm and a gear selecting rocker arm, a spline shaft is arranged at the top of the gear selecting shaft, and correspondingly, a spline hole is formed in the gear selecting rocker arm and matched with the spline shaft; the upper end face of the gear-selecting rocker arm and the top end of the gear-selecting shaft are positioned through a clamping spring. Under the condition that the overall height of the vehicle is limited, the storage space of the cargo bin of the transport vehicle is increased, and the bearing efficiency and practicability of the transport vehicle are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a gearbox top cover structure for a transport vehicle. Background Art

[0002] Transport vehicles, a vital component of modern logistics systems, are widely used in areas such as freight transportation and distribution. The transmission, a crucial component of the vehicle's transmission system, is primarily responsible for transmitting engine power to the wheels on demand, enabling the conversion of speeds and torques to ensure smooth driving in various road conditions.

[0003] As a key transmission component, the transmission cover not only protects internal components from dust and moisture intrusion but also directly impacts the height of the vehicle's flexible shaft connection. In the transport vehicle sector, due to vehicle height restrictions and the relatively fixed height of the transmission's selector shaft, the structure of the transmission cover impacts the vehicle's flexible shaft height and load capacity. Traditional transmission cover structures often utilize a two-component, semicircular groove threaded connection.

[0004] The inventors have discovered that the above-mentioned prior art has at least the following defects: the traditional gearbox top cover structure adopts a two-component semi-circular groove threaded connection method. Although this method is simple, it will result in a high flexible shaft connection height, which in turn limits the vehicle cargo storage space and affects the carrying efficiency and practicality of the transport vehicle. Utility Model Content

[0005] The embodiment of the present application provides a gearbox top cover structure for a transport vehicle, thereby increasing the storage space of the cargo compartment of the transport vehicle while limiting the overall height of the vehicle, thereby improving the carrying efficiency and practicality of the transport vehicle.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a gearbox top cover structure for a transport vehicle, comprising a top cover, a gear selection mechanism installed on one side of the top cover, the gear selection mechanism connected to the gear shifting mechanism, the gear shifting mechanism installed in the top cover, the gear selection mechanism comprising a gear selection shaft, the gear selection shaft connected to a gear selection rocker arm and a gear selection rotating arm, wherein the top of the gear selection shaft is a spline shaft, and correspondingly, a spline hole is provided on the gear selection rocker arm, the spline hole cooperates with the spline shaft; the upper end face of the gear selection rocker arm and the top end of the gear selection shaft are positioned by a retaining spring.

[0007] Since the top of the gear select shaft is connected to the gear select rocker arm with a spline, and the gear select rocker arm is positioned by a retaining spring, the height of the flexible shaft connecting the entire vehicle is reduced compared to a semi-circular groove threaded connection. Therefore, on the basis of a certain height of the entire vehicle, the space in the cargo compartment can be increased as much as possible, thereby improving the carrying efficiency and practicality of the transport vehicle.

[0008] Furthermore, a shoulder is provided at the top of the gear select shaft, and the lower end face of the gear select rocker arm abuts against the shoulder of the gear select shaft; since the lower end face of the gear select rocker arm abuts against the shoulder of the gear select shaft, and the upper end face of the gear select rocker arm is positioned with the gear select shaft by a retaining spring, the gear select rocker arm can be prevented from being offset in the axial direction of the gear select shaft.

[0009] Furthermore, the gear select shaft is installed in the shaft hole on one side of the top cover, and an O-ring is provided between the gear select shaft and the shaft hole; thereby, the O-ring can effectively prevent lubricating oil or other liquids from leaking from the gap between the gear select shaft and the shaft hole.

[0010] Furthermore, a gear selection arm is installed at the lower end of the gear selection shaft, one end of the gear selection arm is connected to the gear selection shaft through a cylindrical pin, and the other end of the gear selection arm is connected to the gear shift mechanism.

[0011] Furthermore, the shift mechanism includes a shift shaft and a shift rod installed on the shift shaft. A spring seat is also installed on the outer periphery of the shift shaft. There are two spring seats, which are respectively located at the two ends of the shift rod. A low-gear side balance spring and a high-gear side balance spring are respectively installed in the two spring seats.

[0012] Furthermore, the shift lever is mounted on the shift shaft via a spline.

[0013] Furthermore, inside the top cover, a blockage is provided between the end of the shift shaft and the top cover, and a positioning pin is provided between the outer periphery of the shift rod and the top cover; the axial positioning of the shift shaft can be achieved through the positioning pin, ensuring that the position of the shift shaft inside the top cover is stable and will not move axially during operation.

[0014] Furthermore, a shift positioning seat is provided on one side of the shift lever, a nut is installed on the shift positioning seat, and a shift damping spring is installed in the shift positioning seat. One end of the shift damping spring abuts against the nut, and the other end of the shift damping spring abuts against the shift damping spring seat. The shift damping spring seat radially abuts against the outside of the shift shaft under the action of the spring, thereby providing a damping effect for the movement of the shift lever on the shift shaft, so that the driver can sense whether the shift lever is in place.

[0015] Furthermore, an adjustment washer is provided between the nut and the shift lever; thus, by changing the thickness of the adjustment washer, the feel of the shift lever during the shifting process can be further optimized.

[0016] Furthermore, a vent plug assembly is provided on the top cover.

[0017] It can be seen from the above technical solutions that the present invention has at least the following technical effects or advantages:

[0018] Since the top of the gear select shaft is connected to the gear select rocker arm with a spline, and the gear select rocker arm is positioned by a retaining spring, the height of the flexible shaft connecting the entire vehicle is reduced compared to a semi-circular groove threaded connection. Therefore, on the basis of a certain height of the entire vehicle, the space in the cargo compartment can be increased as much as possible, thereby improving the carrying efficiency and practicality of the transport vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0020] Figure 1 It is a top view of the utility model;

[0021] Figure 2 This is a cross-sectional view of the utility model Figure 1 (along Figure 1 (AA);

[0022] Figure 3 This is a cross-sectional view of the utility model Figure 2 (Sectional plane and Figure 1 perpendicular to the cutting plane).

[0023] Explanation of the accompanying reference numerals: 1. Breather plug assembly, 2. O-ring, 3. Shift shaft, 4. Circlip, 5. Shift arm, 6. Cylindrical pin, 7. Reverse spring, 8. Low-gear side balance spring, 9. Low-gear side spring seat, 10. Shift lever, 11. High-gear side spring seat, 12. High-gear side balance spring, 13. Skeleton type rubber oil seal, 14. Shift shaft, 15. Top cover, 16. Shift damping spring seat, 17. Shift damping spring, 18. Nut, 19. Adjusting gasket, 20. Plug, 21. Positioning pin. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of this patent, other embodiments obtained by ordinary technicians in this field without making creative work are all within the scope of protection of this patent.

[0025] The utility model discloses a transmission cover structure for a transport vehicle, comprising a cover 15, a gear selection mechanism, and a gear shift mechanism. The gear selection mechanism cooperates with the gear shift mechanism to control the shifting of various gears within the transmission. The gear selection mechanism comprises a gear selection shaft 3, a gear selection rocker arm, and a gear selection rotating arm 5. The gear selection rocker arm and the gear selection rotating arm 5 are mounted at both ends of the gear selection shaft 3. When the gear selection rocker arm is rotated, the gear selection rotating arm 5 rotates accordingly, transmitting the motion to the gear shift mechanism.

[0026] like Figures 1 to 3 As shown, the gear select rocker arm is installed on the top of the gear select shaft 3, wherein the top of the gear select shaft 3 is a spline shaft, and one end of the corresponding gear select rocker arm is a spline hole. The spline hole cooperates with the spline shaft, thereby realizing the spline connection between the gear select shaft 3 and the gear select rocker arm. Compared with the semi-circular groove threaded connection, the height of the vehicle connection is effectively reduced, so that the gear selection connection height between the gearbox and the vehicle is effectively reduced.

[0027] In this embodiment, a vertical axial hole is defined on one side of the top cover 15 for mounting the shift select shaft 3. The shift select shaft 3 is mounted within this axial hole. An annular groove is defined around the outer periphery of the shift select shaft 3, housing an O-ring 2. The outer periphery of the O-ring 2 contacts the inner wall of the axial hole, effectively preventing lubricant or other liquids from leaking through the gap between the shift select shaft 3 and the axial hole. Furthermore, an annular boss is defined at the upper end of the axial hole, effectively preventing moisture from penetrating along the surface into the axial hole, thereby enhancing the durability and reliability of the components within the top cover 15.

[0028] The top of the select shaft 3 features a shoulder, taller than the upper end of the shaft hole, to secure the select rocker arm. The lower end of the arm abuts the shoulder of the shaft 3. A retaining spring 4 is attached to the outer periphery of the top end of the shaft 3, contacting the upper end of the arm. This ensures the rocker arm is positioned axially along the shaft 3.

[0029] The lower end of the gear selector shaft 3 extends to the bottom of the selector cover 15 and is connected to the gear selector arm 5. One end of the gear selector arm 5 is nested around the outer periphery of the lower end of the gear selector shaft 3 and secured by a cylindrical pin 6. The other end of the gear selector arm 5 extends into the inner cavity of the cover 15 and is connected to the shift mechanism.

[0030] The shift mechanism includes a shift shaft 14, a shift lever 10, a spring seat, a high-speed side balance spring 12 and a low-speed side balance spring 8. Figure 3As shown, the shift shaft 14 is mounted on the top cover 15. One end of the shift shaft 14 is located outside the top cover 15 and connected to a crank handle, while the other end of the shift shaft 14 extends into the interior of the top cover 15. Specifically, a skeleton-type rubber oil seal 13 is installed between the shift shaft 14 and the top cover 15 at the end near the crank handle of the shift shaft 14. This prevents the lubricating oil or working medium inside the gearbox from leaking into the external environment. A plug 20 is provided between the other end of the shift shaft 14 and the top cover 15, and a locating pin 21 is provided between the outer periphery of the shift shaft 14 and the top cover 15. The locating pin 21 allows for axial positioning of the shift shaft 14, ensuring that the position of the shift shaft 14 within the top cover is stable and prevents axial movement during operation.

[0031] The shift lever 10 is mounted on the shift shaft 14. Specifically, the outer circumference of the shift shaft 14 is provided with splines, and the inner wall of the shift lever 10 is provided with spline grooves. The spline grooves of the shift lever 10 cooperate with the splines of the shift shaft 14, thereby achieving axial movement of the shift lever 10 and rotational movement with the shift shaft 14. There are two spring seats: a low-range spring seat 9 and a high-range spring seat 11. Both spring seats are mounted on the exterior of the shift shaft 14 and located at the axial ends of the shift lever 10. The high-range balance spring 12 and the low-range balance spring 8 are respectively located within the two spring seats. In addition, a reverse spring 7 is also mounted on the exterior of the shift shaft 14. The reverse spring 7, the high-range balance spring 12, and the low-range balance spring 8 are all prior art and will not be described in detail here.

[0032] like Figure 1 As shown, a shift detent seat is provided on one side of the shift lever 10. A nut 18 is mounted on the shift detent seat. A shift damping spring 17 is installed within the shift detent seat. One end of the shift damping spring 17 abuts the nut 18, while the other end of the shift damping spring 17 abuts the shift damping spring seat 16. The shift damping spring seat 16 and the shift damping spring 17 work together to provide a damping effect on the movement of the shift lever 10 on the shift shaft 14, allowing the driver to sense whether the shift lever 10 is in position. An adjustment washer 19 is also provided between the nut 18 and the shift lever 10. By adjusting the thickness of the adjustment washer 19, the feel of the shift lever 10 during the shifting process can be further optimized.

[0033] In addition, a vent plug assembly 1 is provided on the top cover 15 , through which air can be ventilated, thereby balancing the pressure inside and outside the gearbox.

[0034] In the description of this utility model, the terms "upper," "lower," "front," "back," "left," "right," "top," "bottom," "vertical," "horizontal," and the like, indicating positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely for the purpose of describing the utility model. They do not require that the utility model be constructed or operated in a specific position and are therefore not to be construed as limiting the utility model. The terms "connected" and "connected" in this utility model should be understood broadly, for example, to mean connected or detachably connected; directly connected or indirectly connected via an intermediate component. Those skilled in the art will understand the specific meanings of the above terms in specific circumstances.

[0035] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in their embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novelties disclosed herein.

Claims

1. A transmission top cover structure for a transport vehicle, comprising a top cover (15), a gear selection mechanism being installed on one side of the top cover (15), the gear selection mechanism being connected to a gear shift mechanism, and the gear shift mechanism being installed in the top cover (15), characterized in that: The gear selection mechanism comprises a gear selection shaft (3), the gear selection shaft (3) being connected to a gear selection rocker arm and a gear selection rotating arm (5), wherein the top of the gear selection shaft (3) is a spline shaft, and correspondingly, the gear selection rocker arm is provided with a spline hole, and the spline hole cooperates with the spline shaft; the upper end surface of the gear selection rocker arm and the top end of the gear selection shaft (3) are positioned by a retaining spring (4).

2. The transmission cover structure for a transport vehicle according to claim 1, characterized in that: A shaft shoulder is provided on the top of the gear selection shaft (3), and the lower end surface of the gear selection rocker arm abuts against the shaft shoulder of the gear selection shaft (3).

3. The transmission cover structure for a transport vehicle according to claim 2, characterized in that: The gear selection shaft (3) is installed in a shaft hole on one side of the top cover (15), and an O-ring (2) is provided between the gear selection shaft (3) and the shaft hole.

4. The transmission cover structure for a transport vehicle according to claim 3, characterized in that: The gear selection arm (5) is mounted on the lower end of the gear selection shaft (3), one end of the gear selection arm (5) is connected to the gear selection shaft (3) via a cylindrical pin (6), and the other end of the gear selection arm (5) is connected to the gear shift mechanism.

5. The transmission cover structure for a transport vehicle according to claim 1, characterized in that: The shift mechanism comprises a shift shaft (14), a shift rod (10) mounted on the shift shaft (14), and a spring seat mounted on the outer periphery of the shift shaft. Two spring seats are provided, and the two spring seats are respectively located at two ends of the shift rod (10). A low-gear side balance spring (8) and a high-gear side balance spring (12) are respectively mounted in the two spring seats.

6. The transmission cover structure for a transport vehicle according to claim 5, characterized in that: The shift lever (10) is mounted on the shift shaft (14) via a spline.

7. The transmission cover structure for a transport vehicle according to claim 6, characterized in that: A plug (20) is provided in the top cover (15) between the end of the shift shaft (14) and the top cover (15), and a positioning pin (21) is provided between the outer periphery of the shift lever (10) and the top cover (15).

8. The transmission cover structure for a transport vehicle according to claim 5, characterized in that: A shift positioning seat is provided on one side of the shift lever (10), a nut (18) is installed on the shift positioning seat, a shift damping spring (17) is installed in the shift positioning seat, one end of the shift damping spring (17) abuts against the nut (18), and the other end of the shift damping spring (17) abuts against the shift damping spring seat (16).

9. The transmission cover structure for a transport vehicle according to claim 8, characterized in that: An adjusting washer (19) is provided between the nut (18) and the shift lever (10).

10. The transmission cover structure for a transport vehicle according to claim 1, characterized in that: A vent plug assembly (1) is provided on the top cover (15).

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