Tractor gearbox gear shifting mechanism suitable for flexible shaft control

Abstract

The utility model discloses a tractor gearbox gear shifting mechanism suitable for flexible shaft control. The tractor gearbox gear shifting mechanism comprises a gearbox upper cover shell, a speed change control box shell, a main speed change gear shifting shaft and an auxiliary speed change gear shifting shaft. A gear selecting assembly composed of a gear selecting swing arm shaft, a gear selecting arm and a gear selecting seat with a U-shaped groove and a gear shifting assembly composed of a gear shifting cylinder shaft, a long groove hole and a spring pin are arranged in a speed changing operation box shell, and the gear shifting action is divided into gear selecting and gear shifting. During gear selecting, the gear selecting swing arm shaft is rotated to drive the gear shifting shaft to move axially; during gear shifting, the gear shifting shaft can be driven to rotate by rotating the gear shifting cylinder shaft. Operation actions are output through the independent swing arm shaft and the cylinder shaft, flexible shaft transmission is perfectly matched, the problems of space interference, large stroke, strenuous operation and the like existing in traditional hard rod operation are solved, and long-distance flexible arrangement and comfortable operation of a tractor gear shifting mechanism are achieved.

Description

Technical Field

[0001] This utility model relates to the field of tractor technology, specifically a gear shifting mechanism for a tractor gearbox operated by a flexible shaft. Background Technology

[0002] Currently, most tractor gear shifting uses a lever system with rigid rods and ball joints to achieve gear shifting. Due to structural space limitations, the gear shifting mechanism occupies a large space when operated from a distance, which can easily interfere with the driver's legs or the interior of the cab. In addition, the large shifting stroke can easily lead to driver fatigue. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides the following technical solution:

[0004] A shifting mechanism for a tractor gearbox operated by a flexible shaft includes a gearbox cover housing and a gearbox control housing mounted on its outer side;

[0005] It also includes a main gear shift shaft and a secondary gear shift shaft, which are arranged in parallel and pass through the corresponding mounting holes on the gearbox cover housing and the gear control box housing in sequence, and can move and rotate axially relative to the housing.

[0006] A main gear shift lever is fixed on the main gear shift shaft, and a secondary gear shift lever is fixed on the secondary gear shift shaft.

[0007] The transmission control box housing also contains:

[0008] A gear selector seat is fixed on the main gear shift shaft and the auxiliary gear shift shaft, and a U-shaped groove is provided on the gear selector seat;

[0009] The main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft are rotatably connected to the front and rear ends of the gear control box housing, respectively. Gear selector arms are fixedly connected to the ends of the main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft inside the housing. The outer end of the gear selector arm is provided with a toggle pin, which is inserted into the U-shaped groove of the corresponding gear selector seat.

[0010] The main gear shift cylinder shaft and the auxiliary gear shift cylinder shaft are rotatably connected to the outside of the gearbox housing, respectively. The main gear shift cylinder shaft is slidably sleeved on the main gear shift shaft through its cylinder hole, and the auxiliary gear shift cylinder shaft is slidably sleeved on the auxiliary gear shift shaft through its cylinder hole. The cylinder walls of the main gear shift cylinder shaft and the auxiliary gear shift cylinder shaft are respectively provided with elongated slots. Spring pins that slide and engage with the corresponding elongated slots are fixed on the main gear shift shaft and the auxiliary gear shift shaft, respectively.

[0011] Furthermore, the lower ends of the main shift lever and the auxiliary shift lever are respectively machined with ball heads for insertion into the corresponding shift fork slots in the gearbox.

[0012] Furthermore, the main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft are fixedly connected to a rotating handle for controlling their rotation at one end outside the gear control box housing.

[0013] Furthermore, the main gear shift cylinder shaft and the auxiliary gear shift cylinder shaft are fixedly connected to a rotating handle for controlling their rotation at one end located outside the gear shift control box housing.

[0014] Furthermore, the main shift lever is fixed to the main shift shaft by a spring pin; the auxiliary shift lever is fixed to the auxiliary shift shaft by a spring pin.

[0015] Furthermore, the gear selector seat is fixed to the corresponding main gear shift shaft and auxiliary gear shift shaft by spring pins.

[0016] Furthermore, the main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft are fixedly connected to their respective gear selector arms by spring pins.

[0017] This invention decomposes the gear shifting action into gear selection and gear shifting, which are controlled separately by different swing arms, enabling remote operation via a flexible shaft. This effectively reduces the shifting stroke, avoids interference with the cab interior, improves operating comfort and layout flexibility, and is applicable to various tractor gearbox systems. Attached Figure Description

[0018] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an exploded view of the present invention;

[0020] Figure 2 This is a three-dimensional schematic diagram of the present invention;

[0021] Figure 3 This is a bottom view of the present invention.

[0022] The reference numerals in the diagram are as follows: 1. Gearbox upper cover housing; 2. Gearbox control housing; 3. Main gear shift lever; 4. First spring pin; 5. Main gear shift shaft; 6. Main gear selector seat; 7. Second spring pin; 8. Third spring pin; 9. Main gear selector arm; 10. Main gear selector swing arm shaft; 11. Fourth spring pin; 12. Main gear shift cylinder shaft; 13. Secondary gear shift lever; 14. Fifth spring pin; 15. Secondary gear shift shaft; 16. Secondary gear selector seat; 17. Secondary gear selector arm; 18. Sixth spring pin; 19. Secondary gear selector swing arm shaft; 20. Seventh spring pin; 21. Eighth spring pin; 22. Secondary gear shift cylinder shaft. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] like Figures 1 to 3 As shown, the tractor gearbox shifting mechanism for flexible shaft operation provided by this utility model has a main support structure consisting of a gearbox upper cover housing 1 and a gearbox control housing 2. The gearbox control housing 2 is fixed to the outside of the gearbox upper cover housing 1 by bolts.

[0025] The core transmission components, namely the main shift shaft 5 and the auxiliary shift shaft 15, are arranged in parallel and pass through and are slidably connected to corresponding mounting holes on the gearbox upper cover housing 1 and the gearbox control housing 2. This slidable connection means that the main shift shaft 5 and the auxiliary shift shaft 15 can move axially along their own axes and rotate around their own axes. Inside the gearbox upper cover housing 1, the main shift lever 3 is fixedly mounted on the main shift shaft 5 by a first spring pin 4, and the auxiliary shift lever 13 is fixedly mounted on the auxiliary shift shaft 15 by a fifth spring pin 14. These two shift levers are perpendicular to their respective shift shafts, and the lower ends of both shift levers are machined with ball heads for insertion into slots in the corresponding shift forks (not shown in the figure) inside the gearbox. The axial movement of the main shift shaft 5 and the auxiliary shift shaft 15 drives the corresponding main shift lever 3 and auxiliary shift lever 13 to move left and right, respectively, to select gears (select different shift forks); the rotation of the main shift shaft 5 and the auxiliary shift shaft 15 drives the corresponding main shift lever 3 and auxiliary shift lever 13 to swing back and forth, pushing the shift forks to achieve gear shifting (engaging or disengaging gears).

[0026] Gear selection actuator: Inside the transmission control housing 2, the main gear selector 6 is fixed to the main transmission shift shaft 5 by the second spring pin 7, and the auxiliary gear selector 16 is fixed to the auxiliary transmission shift shaft 15 by the sixth spring pin 18. Each gear selector has a U-shaped groove.

[0027] The main gear selector arm shaft 10 passes through the mounting hole at the front end of the gear control box housing 2 and is rotatably connected to it. The end of the main gear selector arm shaft 10 exposed outside the housing is fixed with a rotating handle for controlling its rotation. The main gear selector arm 9 is fixed to the end of the main gear selector arm shaft 10 located inside the gear control box housing 2 by a third spring pin 8. A toggle pin is fixed at the outer end of the main gear selector arm 9, and this toggle pin is inserted into the U-shaped groove of the main gear selector seat 6.

[0028] Similarly, the auxiliary gear selector swing arm shaft 19 passes through the mounting hole at the rear end of the gear control housing 2 and is rotatably connected to it. The end of the auxiliary gear selector swing arm shaft 19 exposed outside the housing is fixedly connected to a rotating handle for controlling its rotation. The auxiliary gear selector arm 17 is fixed to the end of the auxiliary gear selector swing arm shaft 19 located inside the gear control housing 2 by a seventh spring pin 20. The outer end of the auxiliary gear selector arm 17 is fixedly provided with a toggle pin, which is inserted into the U-shaped groove of the auxiliary gear selector seat 16.

[0029] Gear selection process: When the driver pulls or pushes the rotating handle via the flexible shaft, thereby causing the main gear selection arm shaft 10 and the auxiliary gear selection arm shaft 19 to rotate, the corresponding main gear selection arm 9 and auxiliary gear selection arm 17 will rotate synchronously. The actuating pins at the outer ends of the main gear selection arm 9 and the auxiliary gear selection arm 17 slide in the U-shaped grooves of the main gear selection seat 6 and the auxiliary gear selection seat 16, thus pushing the main gear selection seat 6 and the auxiliary gear selection seat 16 to move axially along the shift shaft. Since the main gear selection seat 6 and the auxiliary gear selection seat 16 are fixedly connected to the corresponding main gear shift shaft 5 and the auxiliary gear shift shaft 15, the entire corresponding main gear shift shaft 5 and the auxiliary gear shift shaft 15 will move axially, completing the corresponding main and auxiliary gear selection action.

[0030] Shifting actuator: The main shift cylinder shaft 12 passes through the mounting hole on the outside of the transmission control housing 2 and is rotatably connected to it. The end of the main shift cylinder shaft 12 exposed outside the housing is fixedly connected to a rotating handle for controlling its rotation. One end of the main shift cylinder shaft 12 located inside the transmission control housing 2 is slidably sleeved on the main shift shaft 5 through its cylinder hole. A long slot is opened on the cylinder wall of the main shift cylinder shaft 12. The extension direction of the long slot is parallel to the axial direction. A fourth spring pin 11 is fixedly connected to the main shift shaft 5 and slides and guides the long slot.

[0031] The auxiliary gear shift cylinder shaft 22 passes through the mounting hole on the outside of the gear control box housing 2 and is rotatably connected thereto. The end of the auxiliary gear shift cylinder shaft 22 exposed outside the housing is fixedly connected to a rotating handle for controlling its rotation. The end of the auxiliary gear shift cylinder shaft 22 located inside the gear control box housing 2 is slidably sleeved on the auxiliary gear shift shaft 15 through its cylinder hole. A long slot is opened on the cylinder wall of the auxiliary gear shift cylinder shaft 22. The extension direction of the long slot is parallel to the axial direction. An eighth spring pin 21 is fixedly connected to the auxiliary gear shift shaft 15 and slides and guides the long slot.

[0032] Gear shifting process: When selecting a gear, the main gear shift shaft 5 and the auxiliary gear shift shaft 15 move axially. At this time, the fourth spring pin 11 and the eighth spring pin 21 slide in the long slots on the walls of the main gear shift cylinder shaft 12 and the auxiliary gear shift cylinder shaft 22. The main gear shift cylinder shaft 12 and the auxiliary gear shift cylinder shaft 22 themselves do not rotate, thus decoupling the gear selection and shifting motion. When shifting gears is required, the main shift cylinder shaft 12 and the auxiliary shift cylinder shaft 22 are rotated by pulling or pushing the rotating handle through the flexible shaft. The long slot walls of the main shift cylinder shaft 12 and the auxiliary shift cylinder shaft 22 will then push the corresponding fourth spring pin 11 and eighth spring pin 21. Since the fourth spring pin 11 and the eighth spring pin 21 are fixed on the corresponding main shift cylinder shaft 5 and the auxiliary shift cylinder shaft 15, the torque is transmitted to the main shift cylinder shaft 5 and the auxiliary shift cylinder shaft 15 to make them rotate. Finally, the corresponding shifting action is completed through the main shift lever 3 and the auxiliary shift lever 13. At this time, the main gear selector 6 and the auxiliary gear selector 16 rotate only without axial movement along with the main gear shift shaft 5 and the auxiliary gear shift shaft 15. The actuating pins at the outer ends of the main gear selector arm 9 and the auxiliary gear selector arm 17 slide within the openings of the U-shaped grooves of the main gear selector 6 and the auxiliary gear selector 16. The main gear selector swing arm shaft 10 and the auxiliary gear selector swing arm shaft 19 themselves do not rotate, thus achieving decoupling between the shifting and selecting motions.

[0033] Workflow Overview:

[0034] Gear selection stage: The driver drives the main gear selection swing arm shaft 10 and the auxiliary gear selection swing arm shaft 19 to rotate via a flexible shaft; through the cooperation of the actuating pins on the main gear selection arm 9 and the auxiliary gear selection arm 17 and the U-shaped groove mechanism of the main gear selection seat 6 and the auxiliary gear selection seat 16, the rotation is converted into the axial movement of the main gear shift shaft 5 and the auxiliary gear shift shaft 15, thereby realizing gear pre-selection.

[0035] During gear shifting: The driver drives the main gear shift cylinder shaft 12 and the auxiliary gear shift cylinder shaft 22 to rotate via a flexible shaft. Through the cooperation of the long slots on the main gear shift cylinder shaft 12 and the auxiliary gear shift cylinder shaft 22 with the fourth spring pin 11 and the eighth spring pin 21 on the main gear shift shaft 5 and the auxiliary gear shift shaft 15, the rotation is directly transmitted to the main gear shift shaft 5 and the auxiliary gear shift shaft 15, causing them to rotate. Finally, the main gear shift lever arm 3 and the auxiliary gear shift lever arm 13 are driven to move the shift fork, engaging or disengaging the pre-selected gear.

[0036] Through the above design, this utility model successfully simplifies the complex spatial lever operation into two independent rotary inputs, perfectly adapts to the transmission characteristics of the flexible shaft, realizes the long-distance and flexible arrangement of the shifting mechanism, and significantly improves the operating comfort.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shifting mechanism for a tractor gearbox operated by a flexible shaft, comprising a gearbox cover housing (1) and a shift control box housing (2) mounted on its outer side, characterized in that: It also includes a main gear shift shaft (5) and a secondary gear shift shaft (15). The main gear shift shaft and the secondary gear shift shaft are arranged in parallel and pass through the corresponding mounting holes on the gearbox cover housing (1) and the gear control box housing (2) in sequence, and can move and rotate axially relative to the housing. A main gear shift lever (3) is fixed on the main gear shift shaft (5), and a secondary gear shift lever (13) is fixed on the secondary gear shift shaft (15). The transmission control box housing (2) is also provided with: A gear selector seat is fixed on the main gear shift shaft and the auxiliary gear shift shaft, and a U-shaped groove is provided on the gear selector seat; The main gear selector swing arm shaft (10) and the auxiliary gear selector swing arm shaft (19) are rotatably connected to the front and rear ends of the gear control box housing (2), respectively. Gear selector arms are fixedly connected to the ends of the main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft inside the housing. The outer end of the gear selector arm is provided with a toggle pin, which is inserted into the U-shaped groove of the corresponding gear selector seat. The main gear shift cylinder shaft (12) and the auxiliary gear shift cylinder shaft (22) are rotatably connected to the outside of the gear control box housing (2). The main gear shift cylinder shaft (12) is slidably sleeved on the main gear shift shaft through its cylinder hole, and the auxiliary gear shift cylinder shaft (22) is slidably sleeved on the auxiliary gear shift shaft through its cylinder hole. The cylinder walls of the main gear shift cylinder shaft (12) and the auxiliary gear shift cylinder shaft (22) are respectively provided with long slot holes. The main gear shift shaft and the auxiliary gear shift shaft are respectively fixed with spring pins that slide in cooperation with the corresponding long slot holes.

2. The tractor gearbox shifting mechanism according to claim 1, characterized in that: The lower ends of the main gear shift lever (3) and the auxiliary gear shift lever (13) are respectively machined with ball heads for insertion into the corresponding shift fork slots in the gearbox.

3. The tractor gearbox shifting mechanism according to claim 1, characterized in that: The main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft are fixedly connected to a rotating handle for controlling their rotation at one end outside the gear control box housing (2).

4. The tractor gearbox shifting mechanism according to claim 1, characterized in that: The main gear shift cylinder shaft (12) and the auxiliary gear shift cylinder shaft (22) are fixed with a rotating handle for controlling their rotation at one end located outside the gear control box housing (2).

5. The tractor gearbox shifting mechanism according to claim 1, characterized in that: The main gear shift lever (3) is fixed to the main gear shift shaft (5) by a spring pin; the auxiliary gear shift lever (13) is fixed to the auxiliary gear shift shaft (15) by a spring pin.

6. The tractor gearbox shifting mechanism according to claim 1, characterized in that: The gear selector seat is fixed to the corresponding main gear shift shaft and auxiliary gear shift shaft by spring pins.

7. The tractor gearbox shifting mechanism according to claim 1, characterized in that: The main gear selector swing arm shaft and the auxiliary gear selector swing arm shaft are fixedly connected to their respective gear selector arms by spring pins.

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