A tractor electric drive gear shifting device

Abstract

This utility model discloses an electric drive gear shifting device for a tractor, relating to the technical field of gear shifting devices. Tractors often have numerous gear shifting mechanisms, occupying a large operating space and increasing operational complexity. In this utility model, a meshing sleeve is slidably mounted on a second shaft portion along the axial direction of the output shaft. An annular groove is formed on the outer circumference of the meshing sleeve. The input end of the transmission mechanism is connected to the output end of the gear shifting reduction motor. The output end of the transmission mechanism is slidably mounted within the annular groove. The gear shifting reduction motor drives the meshing sleeve to slide along the output shaft through the transmission mechanism, thereby achieving gear switching. This utility model realizes the gear shifting function of the gear shifting device through the gear shifting reduction motor and the transmission mechanism, reducing the space occupied. The motor-driven gear shifting device only requires the power cord to be led to the desired location, and gear shifting can be achieved by pressing a button, without occupying a large operating space, greatly reducing the difficulty of operation.

Description

Technical Field

[0001] This utility model relates to the technical field of gear shifting devices, and in particular to a tractor electric drive gear shifting device. Background Technology

[0002] Currently, most tractors in China use sliding gear shifting, meshing sleeve shifting, and synchronizer shifting. These are all mechanical shifting methods, which require various control levers and have strict requirements on operating space, making them difficult to arrange for small and medium horsepower tractors. In addition, the tractor itself also has main and auxiliary gear levers, power take-off levers, shuttle gear levers, differential lock levers, hydraulic lift handles, multi-way valve handles, and hand throttle handles, which not only occupy a large amount of operating space but also increase the complexity of operation. Utility Model Content

[0003] In view of the problems mentioned above, such as the numerous shifting mechanisms on tractors occupying a large operating space and increasing the complexity of operation, the purpose of this utility model is to provide an electric drive shifting device for tractors.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A tractor electric drive gear shifting device includes: an output shaft 3, a driven gear 4, and a meshing sleeve 5. The output shaft 3 has a first shaft portion and a second shaft portion, and the outer wall of the second shaft portion has a first toothed structure. The meshing sleeve 5 is slidably mounted on the second shaft portion along the axial direction of the output shaft 3. The inner wall of the meshing sleeve 5 has a second toothed structure, which meshes with the first toothed structure. An annular groove is formed on the outer periphery of the meshing sleeve 5. The driven gear 4 is sleeved on the first shaft portion, and a bushing portion extends outward from the side of the driven gear 4 facing the meshing sleeve 5. The outer wall of the bushing portion has a third toothed structure. The specifications and dimensions of the third toothed structure are the same as those of the first toothed structure.

[0006] It also includes: a gear shifting reduction motor 11 and a transmission mechanism, the input end of which is connected to the output end of the gear shifting reduction motor 11; the output end of the transmission mechanism is slidably installed in an annular groove, and the gear shifting reduction motor 11 drives the meshing sleeve 5 to slide along the output shaft 3 through the transmission mechanism to achieve gear switching;

[0007] When the meshing sleeve 5 slides along the output shaft 3 to the point where both the third tooth structure and the first tooth structure mesh with the second tooth structure, the driven gear 4 drives the meshing sleeve 5 and the output shaft 3 to rotate synchronously around the axis of the output shaft 3; when the meshing sleeve 5 slides along the output shaft 3 to the point where the second tooth structure meshes only with the first tooth structure, the driven gear 4 spins freely on the output shaft 3.

[0008] The aforementioned electric drive gear shifting device for tractors further includes: an input gear 1 and a fixed shaft 2, wherein the input gear 1 is mounted on the fixed shaft 2 and meshes with the driven gear 4.

[0009] The aforementioned tractor electric drive shifting device further includes: steel balls 6 and springs 7. A limiting through hole is radially opened in the middle of the second shaft. The spring 7 passes through the limiting through hole. Both steel balls 6 are located in the limiting through hole. The two ends of the spring 7 abut against the two steel balls 6 respectively. Both steel balls 6 abut against the inner wall of the engagement sleeve 5.

[0010] In the aforementioned electric drive gear shifting device for tractors, the inner wall of the meshing sleeve 5 is provided with two sets of limiting grooves, one front and one rear. Each set of limiting grooves includes two arc-shaped grooves that match the steel balls 6. When the two steel balls 6 are respectively engaged in the two arc-shaped grooves of the limiting groove on the front side, the driven gear 4 rotates freely on the output shaft 3. When the two steel balls 6 are respectively engaged in the two arc-shaped grooves of the limiting groove on the rear side, the driven gear 4 drives the meshing sleeve 5 and the output shaft 3 to rotate synchronously around the axis of the output shaft 3.

[0011] The aforementioned tractor electric drive shifting device further includes: a retaining ring 8, which is installed on the outer wall of the second shaft, and the engagement sleeve 5 is located between the driven gear 4 and the retaining ring 8. The retaining ring 8 is used to limit the engagement sleeve 5.

[0012] The aforementioned electric drive gear shifting device for tractors includes a transmission mechanism comprising: a rocker arm shaft 9, a shift rocker arm 10, and a slider 12. One end of the rocker arm shaft 9 is connected to the output end of a shift reduction motor 11, which drives the rocker arm shaft 9 to rotate around its own axis. The plane of the shift rocker arm 10 is parallel to the axis of the output shaft 3. One end of the shift rocker arm 10 is connected to the other end of the rocker arm shaft 9. The slider 12 is rotatably mounted on the other end of the shift rocker arm 10 and slides within an annular groove.

[0013] In the aforementioned electric drive gear shifting device for tractors, the rocker arm shaft 9 and the gear shifting rocker arm 10 are perpendicular to each other, the rotation axis of the slider 12 is parallel to the rocker arm shaft 9, and the slider 12 and the rocker arm shaft 9 are located on both sides of the gear shifting rocker arm 10.

[0014] The aforementioned electric drive gear shifting device for tractors includes a gear shifting reduction motor 11 comprising a motor and a worm gear reducer. The output end of the motor is connected to the input end of the worm gear reducer, and the output end of the worm gear reducer is splined to the rocker arm shaft 9.

[0015] In the aforementioned electric drive gear shifting device for tractors, the input gear 1 and the fixed shaft 2 are connected by a key.

[0016] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies:

[0017] (1) This utility model realizes the shifting function of the shifting device through the shifting reduction motor and transmission mechanism, which reduces the complexity of the existing shifting mechanism. The shifting function can be realized by only using the motor to drive the swing arm to rotate, which simplifies the shifting process, reduces the size and weight of the shifting device, and reduces the space occupied.

[0018] (2) In this utility model, the motor-driven shifting device only needs to lead the power line to the required position and press the button to realize the shifting operation. It does not require a large operating space, greatly reduces the difficulty of operation, and is conducive to realizing unmanned tractors in the future. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a tractor electric drive gear shifting device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the second tooth structure of a tractor electric drive shifting device of the present invention, which is engaged only with the first tooth structure.

[0021] Figure 3 This is a schematic diagram showing the state in which the third tooth structure and the first tooth structure of a tractor electric drive shifting device of this utility model are engaged with the second tooth structure.

[0022] Figure 4 This is a schematic diagram of the first extreme position of the slider in the annular groove of the engagement sleeve of a tractor electric drive shifting device according to this utility model.

[0023] Figure 5 This is a schematic diagram of the second extreme position of the slider in the annular groove of the engagement sleeve of a tractor electric drive shifting device according to this utility model.

[0024] Figure 6 This is a schematic diagram of the trajectory of the slider during the rotation of the shift rocker arm around the axis of the rocker arm shaft in a tractor electric drive shifting device according to this utility model.

[0025] In the attached diagram: 1. Input gear; 2. Fixed shaft; 3. Output shaft; 4. Driven gear; 5. Engaging sleeve; 6. Steel ball; 7. Spring; 8. Retaining ring; 9. Rocker arm shaft; 10. Shift rocker arm; 11. Shift gear reducer motor; 12. Slider. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0027] Please refer to Figures 1 to 6 The diagram illustrates an electric drive gear shifting device for a tractor, comprising: an output shaft 3, a driven gear 4, and a meshing sleeve 5. The output shaft 3 has a first shaft portion and a second shaft portion, the outer wall of which has a first toothed structure. The meshing sleeve 5 is slidably mounted on the second shaft portion along the axial direction of the output shaft 3, and the inner wall of the meshing sleeve 5 has a second toothed structure that meshes with the first toothed structure. An annular groove is formed on the outer periphery of the meshing sleeve 5. The driven gear 4 is sleeved on the first shaft portion, and a bushing portion extends outward from the side of the driven gear 4 facing the meshing sleeve 5. The outer wall of the bushing portion has a third toothed structure. The dimensions of the third toothed structure are the same as those of the first toothed structure.

[0028] It also includes: a gear shifting reduction motor 11 and a transmission mechanism, the input end of which is connected to the output end of the gear shifting reduction motor 11; the output end of the transmission mechanism is slidably installed in an annular groove, and the gear shifting reduction motor 11 drives the meshing sleeve 5 to slide along the output shaft 3 through the transmission mechanism to achieve gear switching;

[0029] When the meshing sleeve 5 slides along the output shaft 3 to the point where both the third tooth structure and the first tooth structure mesh with the second tooth structure, the driven gear 4 drives the meshing sleeve 5 and the output shaft 3 to rotate synchronously around the axis of the output shaft 3; when the meshing sleeve 5 slides along the output shaft 3 to the point where the second tooth structure meshes only with the first tooth structure, the driven gear 4 spins freely on the output shaft 3.

[0030] Furthermore, in a preferred embodiment, it further includes: an input gear 1 and a fixed shaft 2, the input gear 1 being mounted on the fixed shaft 2, and the input gear 1 meshing with the driven gear 4.

[0031] Furthermore, in a preferred embodiment, it further includes: steel balls 6 and springs 7, with a limiting through hole radially formed in the middle of the second shaft portion, the spring 7 passing through the limiting through hole, both steel balls 6 being located in the limiting through hole, the two ends of the spring 7 respectively abutting against the two steel balls 6, and both steel balls 6 abutting against the inner wall of the engagement sleeve 5.

[0032] Furthermore, in a preferred embodiment, the inner wall of the meshing sleeve 5 is provided with two sets of limiting grooves, one front and one rear. Each set of limiting grooves includes two arc-shaped grooves that match the steel balls 6. When the two steel balls 6 are respectively engaged in the two arc-shaped grooves of the limiting groove on the front side, the driven gear 4 rotates freely on the output shaft 3. When the two steel balls 6 are respectively engaged in the two arc-shaped grooves of the limiting groove on the rear side, the driven gear 4 drives the meshing sleeve 5 and the output shaft 3 to rotate synchronously around the axis of the output shaft 3.

[0033] Furthermore, in a preferred embodiment, it further includes: a retaining ring 8, which is mounted on the outer wall of the second shaft portion, and the meshing sleeve 5 is located between the driven gear 4 and the retaining ring 8, with the retaining ring 8 used to limit the meshing sleeve 5.

[0034] Furthermore, in a preferred embodiment, the transmission mechanism includes: a rocker arm shaft 9, a shift rocker arm 10, and a slider 12. One end of the rocker arm shaft 9 is connected to the output end of the shift reduction motor 11, which drives the rocker arm shaft 9 to rotate around its own axis. The plane on which the shift rocker arm 10 is located is parallel to the axis of the output shaft 3. One end of the shift rocker arm 10 is connected to the other end of the rocker arm shaft 9. The slider 12 is rotatably mounted on the other end of the shift rocker arm 10 and slides within the annular groove.

[0035] Furthermore, in a preferred embodiment, the rocker arm shaft 9 and the shift rocker arm 10 are perpendicular to each other, the rotation axis of the slider 12 is parallel to the rocker arm shaft 9, and the slider 12 and the rocker arm shaft 9 are located on both sides of the shift rocker arm 10.

[0036] Furthermore, in a preferred embodiment, the gear shifting reduction motor 11 includes: a motor and a worm gear reducer, wherein the output end of the motor is connected to the input end of the worm gear reducer, and the output end of the worm gear reducer and the rocker arm shaft 9 are connected by a spline.

[0037] Furthermore, in a preferred embodiment, the input gear 1 and the fixed shaft 2 are connected by a key.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0039] Based on the above, this utility model also has the following embodiments:

[0040] In a further embodiment of this utility model, a gear shifting reduction motor 11 drives the rocker arm shaft 9 to rotate around its own axis, causing the gear shifting rocker arm 10 to swing back and forth. The slider 12 is rotatably mounted on the gear shifting rocker arm 10. The rocker arm shaft 9 can drive the slider 12 to move along an arc. The specific connection structure is as follows: Figure 1 As shown, the movement trajectory of slider 12 is as follows: Figure 6 As shown, Figure 6 In this invention, 'b' represents the maximum sliding distance of the engagement sleeve 5 along the output shaft 3 to achieve gear shifting; 'a' represents the rotation angle of the shift rocker arm 10 during the process of shifting gears by sliding the engagement sleeve 5 along the output shaft 3; and 'c' represents the maximum forward and backward sliding distance of the slider 12 within the annular groove. The shifting function is achieved by using a shifting reduction motor 11 to drive the shift rocker arm 10 to swing. Since the movement trajectory of the slider 12 during the swinging of the shift rocker arm 10 is an arc, while the movement trajectory of the engagement sleeve 5 on the output shaft 3 is a straight line, this invention divides the movement trajectory of the slider 12 into a running distance 'b' along the X-axis and a running distance 'c' along the Y-axis. The movement trajectory of the engagement sleeve 5 on the output shaft 3 is in the X-axis direction, and the forward and backward sliding of the slider 12 within the annular groove is in the Y-axis direction. (See also...) Figure 4 and Figure 5This represents the forward and backward sliding trajectory of slider 12 within the annular groove. Figure 4 and Figure 5 These are the extreme sliding positions on the front and rear sides, respectively. When slider 12 moves from... Figure 4 Location to walk to Figure 5 The position is reached, and the distance it travels along the Y-axis is c.

[0041] Here, the force can also be decomposed along the X-axis and Y-axis directions. During the movement of slider 12, it is subjected to force Fx in the X-axis direction and force Fy in the Y-axis direction. Fx drives slider 12 to move a distance b along the X-axis direction, and Fy drives slider 12 to move a distance c along the Y-axis direction.

[0042] In a further embodiment of this utility model, the gear shifting reduction motor 11 consists of a motor and a worm gear reducer. The output end of the motor is connected to the input end of the worm gear reducer. The use of a worm gear reducer can ensure the stability and safety of the transmission, and at the same time, it is used to change the output direction of the power.

[0043] In a further embodiment of this utility model, an output gear is mounted on the output shaft 3 to realize the output of power.

[0044] In a further embodiment of this utility model, engine power is transmitted to driven gear 4 via input gear 1, and driven gear 4 can idle on the output shaft. The output shaft of the gear shift reduction motor 11 and the rocker arm shaft 9 are connected via a spline joint for transmission. Figure 6 As shown, when shifting begins, the output shaft of the shifting gear motor rotates counterclockwise by an angle 'a' around its own axis according to a pre-set program, simultaneously driving the rocker arm shaft 9 to rotate synchronously, thereby causing the meshing sleeve 5 to move a distance 'b' towards the driven gear 4. This engages the internal spline of the meshing sleeve 5 with the external spline of the driven gear 4, ultimately transmitting power from the input gear 1 to the output shaft 3. When power transmission needs to be disengaged, the shifting gear motor rotates in the opposite direction by the same angle 'a', causing the meshing sleeve 5 to move a distance 'b' in the opposite direction. During this process, the slider 12 moves back and forth horizontally along the annular groove of the meshing sleeve 5, with a displacement distance of 'c'. Figure 4 and Figure 5 These represent the two extreme positions of the slider 12 after its forward and backward displacement. The driven gear 4 has two internal positioning grooves to position it on the output shaft 3, limiting its displacement along the axis of the output shaft 3. The driven gear 4 and the retaining ring 8 limit the meshing sleeve 5's displacement along the axis of the output shaft 3 to two extreme positions. The forward and reverse rotation angle α of the gear shifting motor can be adjusted as needed.

[0045] In a further embodiment of this utility model, the tractor itself also includes main and auxiliary gear levers, power output control lever, shuttle gear control lever, differential lock control lever, hydraulic lifting handle, multi-way valve control handle, hand throttle control handle, etc. The motor-driven shifting device only needs to lead the power line to the required position, and the shifting operation can be realized by pressing the button. It does not require a large operating space, greatly reduces the difficulty of operation, and is conducive to realizing future unmanned tractors.

[0046] In a further embodiment of this utility model, Figure 2 and Figure 3 The diagram illustrates the positional relationship between the engagement sleeve 5, steel balls 6, and spring 7 when the engagement sleeve 5 is in different gear positions. The inner wall of the engagement sleeve 5 has two sets of limiting grooves, one front and one rear. Each set of limiting grooves includes two arc-shaped grooves that match the steel balls 6. When the two steel balls 6 are respectively engaged in the two arc-shaped grooves of the front limiting groove, the driven gear 4 rotates freely on the output shaft 3. Figure 2 As shown; when the two steel balls 6 are respectively engaged in the two arc-shaped grooves of the limiting groove located on the rear side, the driven gear 4 drives the meshing sleeve 5 and the output shaft 3 to rotate synchronously around the axis of the output shaft 3, as shown. Figure 3 As shown.

[0047] In a further embodiment of this utility model, the engagement sleeve 5 slides along the axis of the output shaft 3. During the process of the engagement sleeve 5 switching from one gear to another, the two steel balls 6 located in a set of limiting grooves are squeezed back into the limiting through hole on the second shaft under the action of the inner wall of the engagement sleeve 5. The spring 7 is compressed by force until it reaches another gear. Under the action of the spring 7, the two steel balls 6 are engaged in another set of limiting grooves.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tractor electric drive gear shifting device, characterized in that, include: The output shaft (3), driven gear (4), and meshing sleeve (5) are provided. The output shaft (3) is provided with a first shaft portion and a second shaft portion. The outer wall of the second shaft portion is provided with a first tooth structure. The meshing sleeve (5) is slidably mounted on the second shaft portion along the axial direction of the output shaft (3). The inner wall of the meshing sleeve (5) is provided with a second tooth structure, and the second tooth structure meshes with the first tooth structure. An annular groove is provided on the outer periphery of the meshing sleeve (5). The driven gear (4) is sleeved on the first shaft portion. A bushing portion extends outward from the side of the driven gear (4) facing the meshing sleeve (5). The outer wall of the bushing portion is provided with a third tooth structure. The specifications and dimensions of the third tooth structure are the same as those of the first tooth structure. It also includes: a gear shifting reduction motor (11) and a transmission mechanism, the input end of the transmission mechanism being connected to the output end of the gear shifting reduction motor (11); the output end of the transmission mechanism is slidably installed in an annular groove, and the gear shifting reduction motor (11) drives the meshing sleeve (5) to slide along the output shaft (3) through the transmission mechanism to achieve gear switching; When the meshing sleeve (5) slides along the output shaft (3) to the point where both the third tooth structure and the first tooth structure mesh with the second tooth structure, the driven gear (4) drives the meshing sleeve (5) and the output shaft (3) to rotate synchronously around the axis of the output shaft (3); when the meshing sleeve (5) slides along the output shaft (3) to the point where the second tooth structure meshes with only the first tooth structure, the driven gear (4) spins freely on the output shaft (3).

2. The tractor electric drive shifting device according to claim 1, characterized in that, Also includes: An input gear (1) and a fixed shaft (2) are provided. The input gear (1) is mounted on the fixed shaft (2), and the input gear (1) meshes with the driven gear (4).

3. The tractor electric drive shifting device according to claim 1, characterized in that, Also includes: The steel ball (6) and the spring (7) have a limiting through hole in the radial direction at the middle of the second shaft. The spring (7) passes through the limiting through hole, and the two steel balls (6) are located in the limiting through hole. The two ends of the spring (7) abut against the two steel balls (6) respectively, and the two steel balls (6) abut against the inner wall of the meshing sleeve (5).

4. The tractor electric drive shifting device according to claim 3, characterized in that, The inner wall of the meshing sleeve (5) is provided with two sets of limiting grooves, one in the front and one in the rear. Each set of limiting grooves includes two arc-shaped grooves that match the steel balls (6). When the two steel balls (6) are respectively engaged in the two arc-shaped grooves of the limiting groove on the front side, the driven gear (4) rotates freely on the output shaft (3). When the two steel balls (6) are respectively engaged in the two arc-shaped grooves of the limiting groove on the rear side, the driven gear (4) drives the meshing sleeve (5) and the output shaft (3) to rotate synchronously around the axis of the output shaft (3).

5. The tractor electric drive shifting device according to claim 1, characterized in that, Also includes: A retaining ring (8) is installed on the outer wall of the second shaft. The meshing sleeve (5) is located between the driven gear (4) and the retaining ring (8). The retaining ring (8) is used to limit the meshing sleeve (5).

6. The tractor electric drive shifting device according to claim 1, characterized in that, The transmission mechanism includes: rocker arm shaft (9), shift rocker arm (10) and slider (12). One end of the rocker arm shaft (9) is connected to the output end of the shift reduction motor (11). The shift reduction motor (11) is used to drive the rocker arm shaft (9) to rotate around its own axis. The plane where the shift rocker arm (10) is located is parallel to the axis of the output shaft (3). One end of the shift rocker arm (10) is connected to the other end of the rocker arm shaft (9). The slider (12) is rotatably installed on the other end of the shift rocker arm (10). The slider (12) is slidably installed in the annular groove.

7. The tractor electric drive shifting device according to claim 6, characterized in that, The rocker arm shaft (9) and the shift rocker arm (10) are perpendicular to each other, and the rotation axis of the slider (12) is parallel to the rocker arm shaft (9). The slider (12) and the rocker arm shaft (9) are located on both sides of the shift rocker arm (10).

8. The tractor electric drive shifting device according to claim 6, characterized in that, The gear shifting reduction motor (11) includes: a motor and a worm gear reducer. The output end of the motor is connected to the input end of the worm gear reducer, and the output end of the worm gear reducer and the rocker arm shaft (9) are connected by a spline.

9. The tractor electric drive shifting device according to claim 2, characterized in that, The input gear (1) and the fixed shaft (2) are connected by a key.

Images