Structure for preventing gear skipping

Abstract

The utility model relates to the field of tractor gearboxes, and discloses a structure for preventing gear skipping, which comprises a gear selecting and shifting shaft welding piece, the gear selecting and shifting shaft welding piece is assembled on a gearbox body, and a gear shifting spring is wound on the surface of the gear selecting and shifting shaft welding piece. One end of the gear selecting and shifting shaft welding piece is rotationally provided with a gear shifting shifting block welding piece, and one end of the gear shifting spring is fixed to one side of the gear shifting shifting block welding piece. In the utility model, as the gear-shifting block welding piece rotates by taking the gear-selecting and gear-shifting shaft as a circle center and the rotating stroke is the distance between two grooves on the middle-gear shifting fork shaft, the gear-shifting rocker arm also rotates along with the gear-shifting block welding piece and the rotating stroke is the distance between the two grooves on the middle-gear shifting fork shaft, and further, the first limiting bolt also rotates synchronously; and then the first limiting bolt is pushed to move to the step surface by means of the pressure of the gear shifting spring, the middle gear cannot jump back to the neutral gear by means of limiting of the step surface, the gear jumping phenomenon is prevented, and the operation comfort of the user during working is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor gearboxes, in particular to a structure for preventing gear jumping. Background Art

[0002] Tractors are one of the important equipment in agricultural machinery, and the tractor transmission system is the core component of tractor performance, which determines the transmission efficiency and control performance of the whole machine. Tractor transmission systems can be divided into stepped transmission and continuously variable transmission according to the implementation form and the number of gears. Stepped transmission: includes two technologies: mechanical shifting and power shifting; continuously variable transmission: includes three technologies: HST, V-belt mechanical continuously variable transmission, and CVT.

[0003] In the prior art, after the shift lever is shifted into the mid-gear fork groove, the mid-gear shift lever jumps back to neutral due to the lack of a limiting structure, so that the tractor cannot travel normally and may skip gears, reducing the comfort of operating the tractor during operation. Utility Model Content

[0004] The utility model aims to provide a structure for preventing gear jumping, so as to solve the problem that gear jumping may occur and the comfort of operating the tractor during operation is reduced.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical scheme: a structure for preventing gear jumping, including a gear selection and shift shaft welded part, the gear selection and shift shaft welded part is assembled on the gearbox body, a shift spring is surrounded by the surface of the gear selection and shift shaft welded part, one end of the gear selection and shift shaft welded part is rotatably provided with a shift dial head welded part, one side of the shift dial head welded part is provided with a threaded groove, one end of the shift spring is fixed to one side of the shift dial head welded part, the other end of the shift spring is fixed to one side of the gear selection and shift shaft welded part, and one end of the gear selection and shift shaft welded part is provided with A shift rocker arm, a mid-range fork body is provided at the bottom end of the shift head weldment, a mid-range fork shaft is rotatably inserted inside the mid-range fork body, a high- and low-range fork body is provided outside the mid-range fork body, a high- and low-range fork shaft is slidably inserted inside the high- and low-range fork body, a sealing cover plate is detachably provided on the top surface of the gearbox body, a through hole is opened on the top surface of the sealing cover plate, a first limiting bolt is rotatably inserted inside the through hole, the upper thread of the first limiting bolt is connected to a first locking nut, and the bottom end of the first limiting bolt is rotatably inserted with one side of the shift rocker arm.

[0006] Preferably, a sleeve hole is opened on one side of the shift rocker arm, a fixing bolt is rotatably inserted inside the sleeve hole, and one end of the fixing bolt passes through the sleeve hole and is threadedly connected to the thread groove.

[0007] Preferably, a limiting hole is provided on the shift head weldment, a connecting column is fixed on one side of the shift rocker arm, and a positioning hole is provided on the surface of the connecting column.

[0008] Preferably, a plurality of mounting bolts are rotatably inserted on the sealing cover plate, and one end of the mounting bolts passes through the sealing cover plate and is threadedly connected to the top surface of the gearbox body.

[0009] Preferably, a secondary speed double gear is rotatably arranged inside the gearbox body, an output shaft is rotatably arranged on the gearbox body, a secondary speed mid-range passive gear is rotatably inserted on the output shaft, a secondary speed low-range passive gear is rotatably inserted on the output shaft, a secondary speed mid-range driving gear is arranged inside the gearbox body, a secondary speed mid-range meshing sleeve is arranged at one end of the secondary speed mid-range driving gear, and the secondary speed mid-range driving gear and the secondary speed mid-range meshing sleeve pass through the secondary speed double gear respectively.

[0010] Preferably, an observation port is provided on the top surface of the sealing cover plate, and a closing cover plate is detachably provided above the observation port, and a plurality of closing bolts are rotatably inserted on the closing cover plate, one end of the closing bolt passes through the closing cover plate and is screwed into the interior of the top surface of the gearbox body, and a spring washer is slidably inserted on the closing bolt.

[0011] Preferably, a fixing hole is opened on one side of the shift rocker arm, a second limiting bolt is rotatably inserted inside the fixing hole, and a second tightening nut is threadedly connected to the second limiting bolt.

[0012] Preferably, an auxiliary water tank is disposed on the bottom surface of the gearbox body, a water injection hole is opened on the top surface of the auxiliary water tank, and a water injection pipe is fixed inside the water injection hole.

[0013] Compared with the prior art, the structure for preventing gear skipping using the above technical solution has the following beneficial effects:

[0014] When the gear selector is in neutral gear, the shift lever is pushed into the groove of the middle gear fork body. When the shift lever is completely out of the groove of the high and low gear fork body, the gear selection action of the middle gear is completed. At this time, the shift lever is pushed into the groove of the middle gear fork body by the pressure of the shift spring to move the end of the first limit bolt. Because there is no limit, the middle gear is easy to jump back to neutral gear. Because there is still a distance from the inner groove of the middle gear fork body, it can continue to move into the groove of the middle gear fork body to the smooth surface. Because the shift lever is rotated with the gear selection and shifting shaft as the center, the rotation stroke is the distance between the two grooves on the middle gear fork shaft, and the shift rocker arm also rotates accordingly, and the stroke is also the distance between the two grooves on the middle gear fork shaft, and then the first limit bolt also rotates synchronously, and the first limit bolt is pushed to move to the step surface again by the pressure of the shift spring. With the limit of the step surface, the middle gear will not jump back to neutral gear, thus preventing the phenomenon of gear jumping and improving the comfort of the user during work.

[0015] Second, when it is necessary to return to neutral, the spring force of the shift spring needs to be overcome, and the first limit bolt is separated from the step surface, and then the neutral gear can be completed. Because there is a deviation in the assembly position, the first limit bolt and the second limit bolt are both adjustable structures, which is convenient for adjustment according to actual needs, increasing the convenience of the tractor when in use;

[0016] 3. By opening an observation port on the top surface of the sealing cover plate, it is convenient for the staff to observe the operation of the gearbox through the observation port, and it is also convenient for the staff to insert the wrench into the gearbox to complete the limit adjustment. Since the gearbox contains lubricating oil, when various gears rotate, oil may be thrown out. Therefore, the sealing cover plate is sealed and fixed on the top surface of the gearbox to prevent the loss and pollution of lubricating oil.

[0017] 4. During the operation of the tractor's gearbox, a certain amount of heat will be accumulated inside. Most of the heat in the gearbox will be absorbed vertically by the tractor, and a small part will be absorbed by the water in the auxiliary water tank, reducing the load on the tractor's water tank. After the water in the auxiliary water tank is reduced, the user will remove the sealing cover and use the water filling pipe to add water to the auxiliary water tank, which relieves the pressure of the tractor's water tank and reduces the working temperature in the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic cross-sectional view of a gearbox body in an embodiment.

[0019] Figure 2 It is a cross-sectional schematic diagram of the local structure of the gearbox body in the embodiment.

[0020] Figure 3 Schematic side view of the gearbox body in the embodiment.

[0021] Figure 4 Schematic diagram of a top view of a gearbox body in an embodiment.

[0022] Figure 5 Schematic diagram of the front view of the shift rocker arm in the embodiment.

[0023] Figure 6 It is a schematic side view of the shift knob weldment in the embodiment.

[0024] Figure 7 Schematic top view of the shift rocker arm in the embodiment.

[0025] In the figure: 1, gearbox body; 2, gear selection and shift shaft welded parts; 3, shifting head welded parts; 4, shifting spring; 5, sleeve hole; 6, threaded groove; 7, fixing bolt; 8, limit hole; 9, sealing cover plate; 10, mounting bolt; 11, penetration hole; 12, first limit bolt; 13, first locking nut; 14, auxiliary transmission double gear; 15, output shaft; 16, auxiliary transmission middle gear driven gear; 17, auxiliary transmission low gear driven gear; 18, auxiliary transmission middle gear main gear Moving gear; 19. Auxiliary transmission mid-range meshing sleeve; 20. Observation port; 21. Closing cover plate; 22. Closing bolt; 23. Spring washer; 24. Mid-range shift fork body; 25. Mid-range shift fork shaft; 26. High and low gear shift fork body; 27. High and low gear shift fork shaft; 28. Fixing hole; 29. ​​Second limit bolt; 30. Second tightening nut; 31. Connecting column; 32. Positioning hole; 33. Shift rocker arm; 34. Auxiliary water tank; 35. Water injection hole; 36. Water injection pipe. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1-Figure 7As shown, a structure for preventing gear jumping includes a gear selection and shift shaft welded component 2, wherein the gear selection and shift shaft welded component is assembled on a gearbox body 1, a gear shift spring 4 surrounds the surface of the gear selection and shift shaft welded component 2, a gear shift head welded component 3 is rotatably provided at one end of the gear selection and shift shaft welded component 2, a threaded groove 6 is provided on one side of the gear shift head welded component 3, one end of the gear shift spring 4 is fixed to one side of the gear shift head welded component 3, and the other end of the gear shift spring 4 is fixed to one side of the gear selection and shift shaft welded component 2, a gear shift rocker arm 33 is provided at one end of the gear selection and shift shaft welded component 2, and a gear shift head welded component 3 is provided at the bottom end. There is a mid-range fork body 24, in which a mid-range fork shaft 25 is rotatably inserted, a high- and low-range fork body 26 is arranged outside the mid-range fork body 24, in which a high- and low-range fork shaft 27 is slidably inserted, a sealing cover plate 9 is detachably arranged on the top surface of the gearbox body 1, a through hole 11 is opened on the top surface of the sealing cover plate 9, in which a first limiting bolt 12 is rotatably inserted, the upper thread of the first limiting bolt 12 is connected to a first locking nut 13, and the bottom end of the first limiting bolt 12 is rotatably inserted with one side of the shift rocker arm 33.

[0028] In use, when the mid-gear is engaged, the shift head welded part 3 is shifted into the groove of the mid-gear fork body 24. When the shift head welded part 3 completely leaves the groove of the high-low gear fork body 26, the mid-gear selection action has been completed. At this time, the shift head welded part 3 pushes the end of the first limit bolt 12 to move with the pressure of the shift spring 4. Due to the lack of limit, the mid-gear easily jumps back to the neutral gear. Since there is still a distance from the inside of the groove of the mid-gear fork body 24, it can continue to move into the groove of the mid-gear fork body 24 until the smooth surface Because the shift head welded part 3 rotates with the gear selection and shifting shaft as the center, and the rotation stroke is the distance between the two grooves on the mid-range shift fork shaft 25, the shift rocker arm 33 also rotates accordingly, and the stroke is also the distance between the two grooves on the mid-range shift fork shaft 25, and then the first limit bolt 12 also rotates synchronously, and the pressure of the shift spring 4 is used again to push the first limit bolt 12 to move to the step surface. With the help of the step surface limitation, the mid-range will not jump back to the neutral gear, preventing the occurrence of gear jumping, thereby improving the comfort of the user's operation during work.

[0029] like Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7As shown, a sleeve hole 5 is provided on one side of the shift rocker arm 33, a fixing bolt 7 is rotatably inserted inside the sleeve hole 5, one end of the fixing bolt 7 passes through the sleeve hole 5 and is threadedly connected to the thread groove 6, a limiting hole 8 is provided on the shift head weldment 3, a connecting column 31 is fixed on one side of the shift rocker arm 33, a positioning hole 32 is provided on the surface of the connecting column 31, a plurality of mounting bolts 10 are rotatably inserted on the sealing cover plate 9, one end of the mounting bolt 10 passes through the sealing cover plate 9 and is threadedly connected to the top surface of the gearbox body 1, and the gearbox A secondary speed double gear 14 is rotatably provided inside the gearbox body 1, an output shaft 15 is rotatably provided on the gearbox body 1, a secondary speed mid-range driven gear 16 is rotatably inserted on the output shaft 15, a secondary speed low-range driven gear 17 is rotatably inserted on the output shaft 15, a secondary speed mid-range driving gear 18 is provided inside the gearbox body 1, a secondary speed mid-range meshing sleeve 19 is provided at one end of the secondary speed mid-range driving gear 18, and the secondary speed mid-range driving gear 18 and the secondary speed mid-range meshing sleeve 19 pass through the secondary speed double gear 14 respectively.

[0030] During use, when it is necessary to return to neutral, the spring force of the shift spring 4 needs to be overcome, and the first limit bolt 12 is separated from the step surface, and then the neutral gear can be completed. Because there is a deviation in the assembly position, the first limit bolt 12 and the second limit bolt 29 are both adjustable structures, which is convenient for adjustment according to actual needs, thereby increasing the convenience of the tractor when in use.

[0031] like Figure 3 and Figure 4 As shown, an observation port 20 is provided on the top surface of the sealing cover plate 9, and a closing cover plate 21 is detachably provided above the observation port 20. A plurality of closing bolts 22 are rotatably inserted on the closing cover plate 21. One end of the closing bolt 22 passes through the closing cover plate 21 and is screwed into the interior of the top surface of the gearbox body 1. A spring washer 23 is slidably inserted on the closing bolt 22. A fixing hole 28 is provided on one side of the shift rocker arm 33. A second limiting bolt 29 is rotatably inserted inside the fixing hole 28, and a second tightening nut 30 is threadedly connected to the second limiting bolt 29.

[0032] During use, by opening an observation port 20 on the top surface of the sealing cover plate 9, it is convenient for the staff to observe the operation of the gearbox body 1 through the observation port 20, and it is also convenient for the staff to insert a wrench into the gearbox body 1 to complete the limit adjustment. Since the gearbox body 1 contains lubricating oil, oil may be thrown out when various gears rotate. For this reason, the sealing cover plate 9 is sealed and fixed on the top surface of the gearbox body 1 to prevent the loss and contamination of the lubricating oil.

[0033] like Figure 1 and Figure 2As shown, an auxiliary water tank 34 is disposed on the bottom surface of the gearbox body 1 , a water injection hole 35 is opened on the top surface of the auxiliary water tank 34 , and a water injection pipe 36 is fixed inside the water injection hole 35 .

[0034] During use, a certain amount of heat will be accumulated inside the gearbox body 1 of the tractor during operation. Most of the heat in the gearbox body 1 will be absorbed vertically by the tractor, and a small part will be absorbed by the water in the auxiliary water tank 34, reducing the load of the tractor water tank. After the water in the auxiliary water tank 34 is reduced, the user will remove the sealing cover plate 9 and use the water injection pipe 36 to add water to the auxiliary water tank 34, which relieves the pressure of the tractor water tank and reduces the working temperature in the gearbox body 1.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gear-jump prevention structure, comprising a gear selection and shift shaft weldment (2), wherein the gear selection and shift shaft weldment is assembled on a gearbox body (1), and is characterized in that: The surface of the gear selection and shift shaft welded component (2) is surrounded by a gear shift spring (4); one end of the gear selection and shift shaft welded component (2) is rotatably provided with a gear shift head welded component (3); one side of the gear shift head welded component (3) is provided with a threaded groove (6); one end of the gear shift spring (4) is fixed to one side of the gear shift head welded component (3); the other end of the gear shift spring (4) is fixed to one side of the gear selection and shift shaft welded component (2); one end of the gear selection and shift shaft welded component (2) is provided with a gear shift rocker arm (33); the bottom end of the gear shift head welded component (3) is provided with a mid-range shift fork body (24); the interior of the mid-range shift fork body (24) A mid-range shift fork shaft (25) is rotatably inserted therein, a high- and low-range shift fork body (26) is arranged outside the mid-range shift fork body (24), a high- and low-range shift fork shaft (27) is slidably inserted inside the high- and low-range shift fork body (26), a sealing cover plate (9) is detachably arranged on the top surface of the gearbox body (1), a through hole (11) is opened on the top surface of the sealing cover plate (9), a first limiting bolt (12) is rotatably inserted inside the through hole (11), an upper thread of the first limiting bolt (12) is connected to a first locking nut (13), and a bottom end of the first limiting bolt (12) is rotatably inserted with a side of a shift rocker arm (33).

2. The structure for preventing gear skipping according to claim 1, characterized in that: A sleeve hole (5) is provided on one side of the shift rocker arm (33), a fixing bolt (7) is rotatably inserted into the sleeve hole (5), and one end of the fixing bolt (7) passes through the sleeve hole (5) and is threadedly connected to the thread groove (6).

3. The structure for preventing gear skipping according to claim 1, characterized in that: A limiting hole (8) is provided on the shift head weldment (3), a connecting column (31) is fixed on one side of the shift rocker arm (33), and a positioning hole (32) is provided on the surface of the connecting column (31).

4. The structure for preventing gear skipping according to claim 1, characterized in that: A plurality of mounting bolts (10) are rotatably inserted on the sealing cover plate (9), and one end of the mounting bolt (10) passes through the sealing cover plate (9) and is threadedly connected to the top surface of the gearbox body (1).

5. The structure for preventing gear skipping according to claim 1, characterized in that: A secondary speed double gear (14) is rotatably arranged inside the gearbox body (1), an output shaft (15) is rotatably arranged on the gearbox body (1), a secondary speed middle gear driven gear (16) is rotatably inserted on the output shaft (15), a secondary speed low gear driven gear (17) is rotatably inserted on the output shaft (15), a secondary speed middle gear driving gear (18) is rotatably arranged inside the gearbox body (1), a secondary speed middle gear meshing sleeve (19) is arranged at one end of the secondary speed middle gear driving gear (18), and the secondary speed middle gear driving gear (18) and the secondary speed middle gear meshing sleeve (19) respectively pass through the secondary speed double gear (14).

6. The structure for preventing gear skipping according to claim 1, characterized in that: The top surface of the sealing cover plate (9) is provided with an observation port (20), and a closing cover plate (21) is detachably provided above the observation port (20). A plurality of closing bolts (22) are rotatably inserted into the closing cover plate (21), one end of the closing bolt (22) passes through the closing cover plate (21) and is screwed into the interior of the top surface of the gearbox body (1), and a spring washer (23) is slidably inserted into the closing bolt (22).

7. The structure for preventing gear skipping according to claim 1, characterized in that: A fixing hole (28) is provided on one side of the shift rocker arm (33), a second limiting bolt (29) is rotatably inserted inside the fixing hole (28), and a second tightening nut (30) is threadedly connected to the second limiting bolt (29).

8. The structure for preventing gear skipping according to claim 1, characterized in that: An auxiliary water tank (34) is arranged on the bottom surface of the gearbox body (1), a water injection hole (35) is opened on the top surface of the auxiliary water tank (34), and a water injection pipe (36) is fixed inside the water injection hole (35).

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