Auxiliary gearbox control mechanism and tractor

Abstract

The utility model discloses an auxiliary gearbox control mechanism which comprises an auxiliary gearbox which is independent of a main gearbox and installed on a rear axle shell body in parallel with the main gearbox, the auxiliary gearbox comprises a control upper cover and a control transmission shaft arranged in the control upper cover, and a control rod is arranged above one end of the control upper cover. One end of the control transmission shaft is connected with the control lever through a rocker, and the other end is downwards provided with a shifting block; the rear axle shell is further provided with a gear shifting fork shaft capable of moving in the axial direction of the rear axle shell, the included angle between the gear shifting fork shaft and the control transmission shaft is 90 degrees, the bottom of the gear shifting block is connected with the gear shifting fork shaft, and a gear shifting fork is fixed to the gear shifting fork shaft. The utility model solves the problems that the common shell of the existing main and auxiliary transmissions is difficult to process and control and arrange, and overcomes the defect that the control transmission shaft deforms due to stress.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically a secondary gearbox control mechanism and a tractor. Background Technology

[0002] Currently, most existing tractor gearbox control mechanisms adopt a design similar to that shown in patent publication number CN 218913695 U, primarily using an integrated main and auxiliary gearbox design. The main and auxiliary gearboxes share a common housing, involving multiple complex machining steps such as multi-stage shaft coaxiality machining and internal cavity cross-structure design, requiring high precision and presenting significant machining challenges. The installation position and arrangement of the control levers must be coordinated with the gearbox housing design, making individual adjustments difficult and reducing the flexibility of the overall layout. Furthermore, the main and auxiliary control levers may be too close together, easily causing interference during operation, reducing ergonomic performance and affecting driver comfort. In addition, the control mechanism of the main and auxiliary gearbox system is an integrated, linked design; adjusting one part may affect the overall structure, significantly increasing the complexity of maintenance and debugging.

[0003] Secondly, the shift paddles of the existing tractor gearbox control mechanism are actually cantilever beams. One end of the cantilever structure is fixed, while the other end bears the load. When subjected to force, a large bending stress and deformation will be generated below the paddle, which will cause the control fork shaft to be subjected to additional bending moment. This will cause uneven deformation of the control fork shaft, reduce the control precision, and may lead to difficulty in shifting or paddle jamming.

[0004] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of this utility model is to provide a secondary gearbox control mechanism and tractor, which solves the problems of difficult processing of the shared housing of the main and secondary gearboxes and difficult control arrangement, and overcomes the defect of deformation of the control transmission shaft under force.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A secondary gearbox control mechanism includes a secondary gearbox that is independent of and parallel to the primary gearbox, mounted on a rear axle housing. The secondary gearbox includes a control cover and a control transmission shaft disposed within the control cover. A control lever is disposed above one end of the control cover. One end of the control transmission shaft is connected to the control lever via a rocker arm, and a shift paddle is disposed downward at the other end. The rear axle housing also includes a shift fork shaft that is axially movable. The shift fork shaft is disposed at a 90° angle to the control transmission shaft. The bottom of the shift paddle is connected to the shift fork shaft to drive the shift fork shaft. A shift fork is fixed on the shift fork shaft.

[0008] Specifically, a lower control cover is provided at the bottom of the upper control cover located at one end of the control lever, and the connection between the control lever and the rocker arm extends into the lower control cover.

[0009] Specifically, the control lever is mounted on the control cover via a control bracket.

[0010] Specifically, it also includes a return spring for returning the control transmission shaft to its original position, the return spring being mounted on the control transmission shaft.

[0011] This utility model also discloses a tractor, including the auxiliary gearbox control mechanism as described above.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model improves the main and auxiliary transmissions from an integrated main and auxiliary transmission to independent operation. It adopts an independent auxiliary transmission and is installed in parallel with the main transmission on the rear axle housing. The components of the auxiliary transmission can be independently designed, processed and assembled, reducing the precision requirements of the processing equipment and reducing complex cross-processing. It is suitable for various working conditions. The main and auxiliary transmissions can be replaced, repaired or upgraded independently, reducing maintenance costs.

[0014] 2. The shift lever has been improved from a cantilever type to a simply supported beam type. The simply supported beam structure has support points at both ends. After being subjected to force, the internal stress is distributed and transmitted through the support points, which reduces stress concentration at a single point and optimizes the force transmission path. The control transmission shaft does not directly bear a large bending moment, the bending stress is significantly reduced, and the deformation range is lower. Therefore, the overall structural rigidity is enhanced and the shifting is more stable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the arrangement of a secondary gearbox control mechanism according to the present invention;

[0016] Figure 2 This is a schematic diagram of one side of the structure of a secondary gearbox control mechanism according to the present invention;

[0017] Figure 3This is a schematic diagram of the other side of the structure of the auxiliary gearbox control mechanism of this utility model;

[0018] Figure 4 This is a cross-sectional view of a secondary gearbox control mechanism according to the present invention.

[0019] In the diagram, 1-main gearbox; 2-rear axle housing; 3-auxiliary gearbox; 4-control upper cover; 5-control transmission shaft; 6-control lever; 7-rocker; 8-shift lever; 9-shift fork shaft; 10-shift fork; 11-control lower cover; 12-control support; 13-return spring. Detailed Implementation

[0020] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. In the description of these embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing these embodiments and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] like Figure 1-4 As shown, this embodiment discloses a secondary gearbox operating mechanism, mainly including a secondary gearbox 3, wherein the secondary gearbox 3 is set independently of the primary gearbox 1. The secondary gearbox 3 includes an operating cover 4 and an operating transmission shaft 5 disposed within the operating cover 4, and also includes a return spring 13 for returning the operating transmission shaft 5 to its original position, the return spring 13 passing through the operating transmission shaft 5. An operating lever 6 is disposed above one end of the operating cover 4, and the operating lever 6 is mounted on the operating cover 4 via an operating support 12. One end of the control transmission shaft 5 is connected to the control lever via the rocker arm 7. The bottom of the control upper cover 4 located at one end of the control lever 6 is also provided with a control lower cover 11. The connection between the control lever 6 and the rocker arm 7 extends into the control lower cover 11. The other end is provided with a shift head 8 facing downward. The rear axle housing 2 is also provided with two shift fork shafts 9 that can move along its axial direction. The shift fork shafts 9 are set at a 90° angle with the control transmission shaft 5. The bottom of the shift head 8 is connected to the middle of the shift fork shaft 9. A shift fork 10 is fixed on the shift fork shaft 9.

[0022] During operation, the driver pushes or pulls the control lever 6. The movement of the control lever 6 is transmitted to the control transmission shaft 5 via the rocker arm 7. The movement of the control transmission shaft 5 causes the shift paddle 8 to move axially and connect with one of the shift fork shafts 9. The driver shakes the control lever 6 left or right, and the shift paddle 8 drives the shift fork shaft 9 to move axially. The shift fork 10 follows the movement and acts on the gears or synchronizers in the auxiliary gearbox to achieve the shifting operation. The auxiliary gearbox is set up independently, which helps to reduce the manufacturing difficulty and optimize the operation layout. Because the shift paddle 8 is improved from a cantilever type to a simply supported beam type, the simply supported beam structure has the control transmission shaft 5 as support at the upper end and the shift fork shafts 9 as support points at both lower ends. After being subjected to force, the internal stress is distributed and transmitted through the support points, reducing stress concentration at single points and reducing deformation of the control fork shaft under stress.

[0023] refer to Figure 1 As shown, this embodiment also discloses a tractor that adopts the above-mentioned auxiliary gearbox control mechanism. The auxiliary gearbox 3 is independent of the main gearbox 1 and is installed in parallel with the main gearbox 1 on the rear axle housing 2. The components of the auxiliary gearbox can be designed, processed and assembled independently, reducing the precision requirements of the processing equipment and reducing complex cross-processing. It is suitable for various working conditions. The main gearbox and the auxiliary gearbox can be replaced, repaired or upgraded independently, reducing maintenance costs.

[0024] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A secondary gearbox operating mechanism, characterized in that: It includes an auxiliary gearbox (3) that is independent of the main gearbox (1) and is installed in parallel with the main gearbox (1) on the rear axle housing (2). The auxiliary gearbox (3) includes a control cover (4) and a control transmission shaft (5) disposed in the control cover (4). A control lever (6) is provided above one end of the control cover (4). One end of the control transmission shaft (5) is connected to the control lever through a rocker arm (7), and the other end is provided with a shift paddle (8) facing downward. The rear axle housing (2) is also provided with a shift fork shaft (9) that can move along its axial direction. The shift fork shaft (9) is set at a 90° angle with the control transmission shaft (5). The bottom of the shift head (8) is connected to the shift fork shaft (9) to drive the shift fork shaft (9) to move. A shift fork (10) is fixed on the shift fork shaft (9).

2. The auxiliary gearbox operating mechanism according to claim 1, characterized in that: A lower control cover (11) is also provided at the bottom of the upper control cover (4) located at one end of the control lever (6), and the connection between the control lever (6) and the rocker arm (7) extends into the lower control cover (11).

3. The auxiliary gearbox operating mechanism according to claim 1, characterized in that: The control lever (6) is mounted on the control cover (4) via the control support (12).

4. The auxiliary gearbox operating mechanism according to claim 1, characterized in that: It also includes a return spring (13) for returning the control transmission shaft (5) to its original position, the return spring (13) being mounted on the control transmission shaft (5).

5. A tractor, characterized in that, Includes the auxiliary gearbox operating mechanism as described in any one of claims 1 to 4.

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