Gear shifting mechanism

Abstract

The utility model discloses a gear shifting mechanism, and relates to the technical field of gearbox gear shifting control mechanisms, the gear shifting mechanism comprises a gear shifting shaft, a gear selecting shifting sleeve, a gear shifting rocker arm and a gear shifting shifting block used for being connected with a gearbox, the gear shifting shaft is rotatably sleeved in the gear selecting shifting sleeve, and an axial limiting structure is arranged between the gear shifting shaft and the gear selecting shifting sleeve; one end of the gear shifting shaft is in axial sliding connection with the gear shifting rocker arm, and a rotation limiting structure is arranged between the gear shifting shaft and the gear shifting rocker arm. The other end of the gear shifting shaft penetrates through a gearbox shell to be connected with the gear shifting block, and an elastic reset structure is arranged between the gear shifting block and the gearbox shell. According to the gear shifting mechanism, gear selecting and gear shifting are operated separately, the purposes of being short in transmission route, few in related parts and high in transmission efficiency are achieved, and accurate control over gear shifting operation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gearbox shifting operating mechanisms, in particular to a gear shifting mechanism. Background Art

[0002] At present, the gear shift mechanism of tractor transmissions generally uses the same lever to complete the gear selection and shifting operations of the transmission. However, with the increasing demand for precise control of tractors, this traditional tractor transmission gear shift mechanism is increasingly unable to meet the requirements of precise control. This traditional tractor transmission gear shift mechanism mainly has the following problems: the mechanical transmission route is long, many parts are involved, and there is a lot of coordination between the parts, the transmission error is large, the actual transmission efficiency is poor, and it is difficult to achieve precise control. Utility Model Content

[0003] In view of the above defects in the prior art, the present invention aims to provide a gear shifting mechanism which separates the gear selection and shifting operations, thereby achieving the purpose of short transmission route, few parts involved, high transmission efficiency, and realizing precise control of the gear shifting operation.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A shift mechanism comprises a shift shaft, a shift selector sleeve, a shift rocker arm and a shift head connected to a gearbox, wherein the shift shaft is rotatably sleeved in the shift selector sleeve, and an axial limiting structure is provided between the shift shaft and the shift selector sleeve; one end of the shift shaft is axially slidably connected to the shift rocker arm, and a rotation limiting structure is provided between the shift shaft and the shift rocker arm; the other end of the shift shaft passes through a gearbox housing and is connected to the shift head, and an elastic reset structure is provided between the shift head and the gearbox housing.

[0006] The shift sleeve comprises a shift sleeve body and a shift fork structure for cooperating with a shift rocker arm, and the shift shaft is rotatably sleeved in the shift sleeve body.

[0007] A connecting sleeve is fixedly provided at one end of the shift shaft, an annular limit platform is radially protruded from the shift shaft, the connecting sleeve and the limit platform constitute the axial limit structure, and the shift sleeve body is located between the connecting sleeve and the limit platform.

[0008] Wherein, a connecting shaft is fixedly provided on the shift rocker arm, the shift shaft and the shift rocker arm are axially slidably connected through the connecting shaft and the connecting sleeve, and the rotation limiting structure is provided between the connecting shaft and the connecting sleeve.

[0009] In which, the connecting sleeve includes a circular hole segment and an oblong hole segment, and the connecting sleeve is fixedly mounted on the shift shaft through the circular hole segment; the connecting shaft has an oblong segment that is compatible with the oblong hole segment, and the connecting sleeve is axially slidably mounted on the oblong segment through the oblong hole segment, and the oblong hole segment and the oblong segment constitute the rotation limiting structure.

[0010] Wherein, the elastic reset structure is a spring, and the spring is sleeved on the shift shaft.

[0011] Wherein, a gear selector head is fixedly connected to the gear selector rocker arm, and the gear selector head is inserted into the gear selector fork structure.

[0012] By adopting the above technical solution, the beneficial effects of the utility model are:

[0013] The shift mechanism provided by the utility model separates the gear selection and shifting operations, and realizes the gear selection operation by driving the gear shift shaft and the gear shift head arranged on the gear shift shaft to move axially through the gear selector sleeve, and realizes the gear shifting operation by driving the gear shift shaft and the gear shift head arranged on the gear shift shaft to rotate through the gear shift rocker arm, thereby achieving the purposes of short transmission route, few involved parts, and high transmission efficiency, and realizing precise control of the gear shifting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the shift mechanism of the utility model in use;

[0015] Figure 2 yes Figure 1 Structural diagram of the middle shift mechanism;

[0016] Figure 3 yes Figure 2 Exploded diagram;

[0017] In the figure: 1. Shift shaft; 11. Limit plate; 2. Shift selector sleeve; 21. Shift sleeve body; 22. Shift fork structure; 3. Shift rocker arm; 4. Shift shift head; 5. Transmission housing; 6. Connecting sleeve; 61. Long oval hole section; 7. Shift rocker arm; 8. Connecting shaft; 81. Long oval section; 9. Spring; 10. Shift selector head. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0019] like Figures 1 to 3As shown, this embodiment discloses a shift mechanism, including a shift shaft 1, a shift selector sleeve 2, a shift rocker arm 3 and a shift head 4 for connecting to a gearbox. The shift shaft 1 is rotatably sleeved in the shift selector sleeve 2, and an axial limiting structure is provided between the shift shaft 1 and the shift selector sleeve 2; one end of the shift shaft 1 is axially slidably connected to the shift rocker arm 3, and a rotation limiting structure is provided between the shift shaft 1 and the shift rocker arm 3; the other end of the shift shaft 1 passes through the gearbox housing 5 and is connected to the shift head 4, and an elastic reset structure is provided between the shift head 4 and the gearbox housing 5.

[0020] The shift sleeve 2 in this embodiment includes a sleeve body 21 and a shift fork structure 22 for cooperating with the shift rocker arm 7 , and the shift shaft 1 is rotatably sleeved in the sleeve body 21 .

[0021] In this embodiment, a connecting sleeve 6 is fixedly provided at one end of the shift shaft 1, and an annular limit platform 11 is radially protruded on the shift shaft 1. The connecting sleeve 6 and the limit platform 11 constitute the above-mentioned axial limit structure, and the shift sleeve body 21 of the shift selector sleeve 2 is located between the connecting sleeve 6 and the limit platform 11.

[0022] In this embodiment, a connecting shaft 8 is fixedly provided on the shift rocker arm 3. The shift shaft 1 and the shift rocker arm 3 are axially slidably connected through the connecting shaft 8 and the connecting sleeve 6. The rotation limiting structure is provided between the connecting shaft 8 and the connecting sleeve 6.

[0023] Specifically, the connecting sleeve 6 includes a circular hole section and an oblong hole section 61. The inner hole of the circular hole section is a circular hole, and the inner hole of the oblong hole section 61 is an oblong hole. The connecting sleeve 6 is fixedly sleeved on the shift shaft 1 through the circular hole section; the connecting shaft 8 has an oblong section 81 that is adapted to the oblong hole section 61. The connecting sleeve 6 is axially slidably sleeved on the oblong section 81 through the oblong hole section 61. The oblong hole section 61 and the oblong section 81 constitute the above-mentioned rotation limiting structure.

[0024] The elastic reset structure in this embodiment is a spring 9 , which is sleeved on the shift shaft 1 .

[0025] In this embodiment, the gear selection rocker arm 7 is fixedly connected to a gear selection shift head 10 , which is inserted into the shift fork structure 22 .

[0026] When in use, the shift rocker arm 7 drives the shift selector sleeve 2 to move axially, and the shift selector sleeve 2 drives the shift shaft 1 and the shift head 4 connected to the shift shaft 1 to move axially, thereby realizing the gear selection operation of the shift head 4; the shift rocker arm 3 drives the shift shaft 1 and the shift head 4 connected to the shift shaft 1 to rotate, thereby realizing the gear shifting operation of the shift head 4.

[0027] The above describes in detail a preferred embodiment of the shift mechanism of the present invention. Further embodiments are not described here in detail. In summary, the shift mechanism of the present invention achieves the goals of a short transmission path, fewer components, and high transmission efficiency by separating the gear selection and shifting operations, thereby achieving precise control of the shifting operation.

[0028] The present invention is not limited to the above-mentioned specific implementation methods. Various changes made by ordinary technicians in this field based on the above-mentioned conception without creative work are all within the scope of protection of the present invention.

Claims

1. A shift mechanism, characterized in that: It includes a shift shaft, a shift selector sleeve, a shift rocker arm and a shift head connected to the gearbox, the shift shaft rotating sleeve is arranged in the shift selector sleeve, and an axial limiting structure is provided between the shift shaft and the shift selector sleeve; one end of the shift shaft is axially slidingly connected to the shift rocker arm, and a rotation limiting structure is provided between the shift shaft and the shift rocker arm; the other end of the shift shaft passes through the gearbox housing and is connected to the shift head, and an elastic reset structure is provided between the shift head and the gearbox housing.

2. The shift mechanism according to claim 1, wherein: The shift sleeve comprises a shift sleeve body and a shift fork structure for cooperating with the shift rocker arm, and the shift shaft is rotatably sleeved in the shift sleeve body.

3. The shift mechanism according to claim 2, characterized in that: A connecting sleeve is fixedly provided at one end of the shift shaft, an annular limiting platform is radially protruded from the shift shaft, the connecting sleeve and the limiting platform constitute the axial limiting structure, and the shift sleeve body is located between the connecting sleeve and the limiting platform.

4. The shift mechanism according to claim 3, characterized in that: A connecting shaft is fixedly provided on the shift rocker arm, and the shift shaft and the shift rocker arm are axially slidably connected through the connecting shaft and the connecting sleeve, and the rotation limiting structure is provided between the connecting shaft and the connecting sleeve.

5. The shift mechanism according to claim 4, characterized in that: The connecting sleeve includes a circular hole section and an oblong hole section, and the connecting sleeve is fixedly mounted on the shift shaft through the circular hole section; the connecting shaft has an oblong section that is adapted to the oblong hole section, and the connecting sleeve is axially slidably mounted on the oblong section through the oblong hole section, and the oblong hole section and the oblong section constitute the rotation limiting structure.

6. The shift mechanism according to claim 1, wherein: The elastic reset structure is a spring, and the spring is sleeved on the shift shaft.

7. The shift mechanism according to claim 2, characterized in that: The gear selection rocker arm is fixedly connected with a gear selection shift head, and the gear selection shift head is inserted into the shift fork structure.

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