Lever type coaxial reversing and gear shifting device with large gear shifting force

Abstract

The utility model relates to the technical field of reversing and gear shifting devices, in particular to a lever type coaxial reversing and gear shifting device with large gear shifting force. The speed changing box comprises a speed changing box and a reversing gear shifting mechanism arranged on the outer side of the speed changing box in a lever mode, the reversing gear shifting mechanism comprises a gear shifting rod, and the middle of the left side of the gear shifting rod is hinged to a hinge seat of a speed changing box shell. The left end of the gear shifting rod is hinged to a gear shifting fork shaft of the gearbox, and the gear shifting fork shaft is fixed to a shell of the gearbox through an oil seal seat. The right end of the gear shifting rod is connected with the stay wire support through a stay wire. The gear shifting device is compact in structure, the gear shifting rod is connected with the oil seal base, the hinge base and the stay wire support, the problem that the gear shifting force of an agricultural machine gearbox is large is solved, and the gear shifting force is effectively reduced; the gear shifting rod and the stay wire support are reasonably arranged, the stay wire is always in a linear state, and bending of the stay wire caused by the space problem of the whole vehicle can be avoided.

Description

Lever-type coaxial shifting device with high shifting force Technical Field

[0001] This utility model relates to the technical field of shifting and gear-shifting devices, specifically to a lever-type coaxial shifting and gear-shifting device with large shifting force. Background Technology

[0002] In the use of agricultural machinery transmissions, the shifting force directly affects the ease and reliability of operation. Existing agricultural machinery transmission shifting devices suffer from high shifting forces, requiring operators to apply significant force during shifting, increasing operational difficulty and reducing work efficiency. To address this issue, those skilled in the art have explored solutions. For example, Chinese patent publication number CN202100700U discloses a shifting actuator for a dual-clutch automatic transmission, which connects a shift lever assembly between the shift fork mechanism and the hydraulic control system, adjusting the lever ratio to achieve different shift strokes and forces. However, this solution uses interlocking pins and limiting pins on the shift fork mechanism for interlocking and limiting functions, resulting in a complex structure. Furthermore, the layout of the shift lever and cable bracket is unreasonable; the cable is prone to bending due to space constraints, significantly increasing the shifting force. Additionally, misalignment of the shift fork shafts can also lead to increased shifting force or shifting failure. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a lever-type coaxial shifting device with large shifting force.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A lever-type coaxial shifting device with high shifting force includes a gearbox and a shifting mechanism that is lever-type and disposed on the outside of the gearbox. The shifting mechanism includes a shift lever, the middle of the left side of which is hinged to a hinge seat on the gearbox housing; the left end of the shift lever is hinged to the shift fork shaft of the gearbox, and the shift fork shaft is fixed to the gearbox housing by an oil seal seat; the right end of the shift lever is connected to a cable bracket by a cable.

[0006] The shifting mechanism of this technical solution features a compact structure. It includes an oil seal seat, a hinge seat, and a cable bracket arranged along a straight line, connected to the shift lever to form a lever-type high-shifting-force structure. This leverage principle effectively reduces shifting force, solving the problem of high shifting force in agricultural machinery gearboxes. Furthermore, the rational layout of the shift lever and cable bracket ensures the cable remains straight, preventing bending due to space constraints and avoiding a significant increase in shifting force. The shift fork shaft is coaxially mounted with the left end of the shift lever via the oil seal seat, effectively avoiding misalignment between the shift bracket and the shift fork shaft, which can lead to increased shifting force or shifting failure. In essence, through this lever-type high-shifting-force structure, the shifting mechanism of this technical solution changes from traditional coaxial shifting to 90° shifting, achieving a labor-saving effect by using a lever to change the force transmission path by 90°.

[0007] In addition, the lever-type coaxial shifting device with large shifting force proposed in this utility model may also have the following additional technical features:

[0008] According to one embodiment of the present invention, the pull cable drives the shift lever to rotate relative to the hinge seat, and the shift lever drives the shift fork shaft to move synchronously to achieve coaxial shifting.

[0009] In this technical solution, the cable applies external force through the shift lever. The cable passes through the cable bracket and drives the right end of the shift lever to move up and down. The right side of the shift lever is the power arm, and the left side is the resistance arm. The left end of the shift lever drives the coaxially mounted shift fork shaft to move up and down. The shift fork shaft is connected to the shift fork inside the gearbox, thereby realizing the gearbox shifting operation.

[0010] According to one embodiment of the present invention, a pin hole I is provided in the middle of the left side of the shift lever, and a fixed pin I that cooperates with the pin hole I is installed on the hinge seat, and the shift lever rotates around the fixed pin I.

[0011] In this technical solution, the fixed pin I includes pin I and cotter pin I. Pin I passes through pin hole I of the shift lever and pin hole on the hinge seat, and is fixed by cotter pin I cooperating with pin I.

[0012] According to one embodiment of the present invention, the left end of the shift lever is provided with a pin hole II, and a fixed pin II that cooperates with the pin hole II is installed on the oil seal seat. The fixed pin II passes through the oil seal seat, the shift lever and the shift fork shaft that are coaxially arranged, and the shift lever coaxially drives the shift fork shaft to move.

[0013] In this technical solution, the fixed pin Ⅱ includes pin Ⅱ and cotter pin Ⅱ. Pin Ⅱ passes through the pin hole Ⅱ of the shift lever, the pin hole on the oil seal seat, and the pin hole of the shift fork shaft, and is fixed by the cotter pin Ⅱ cooperating with pin Ⅱ.

[0014] According to one embodiment of the present invention, the left end of the shift lever is provided with a wiring hole, a pull cable that mates with the wiring hole is installed on the pull cable bracket, and the other end of the pull cable is connected to the shift control lever.

[0015] In this technical solution, the cable bracket is fixed to the gearbox housing by a mounting base, and the cable bracket is provided with a guide hole through which the cable passes.

[0016] According to one embodiment of the present invention, the hinge seat is located near the oil seal seat on the left end, the left side of the shift lever is the resistance arm, and the right side of the shift lever is the power arm.

[0017] In this technical solution, the movement of the shift fork shaft is achieved by changing the force transmission path by 90° through a lever, changing the traditional coaxial shifting to 90° reversing shifting, thus achieving a labor-saving effect and solving the problem of large shifting force in agricultural machinery gearboxes.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] This utility model has a compact structure. By connecting the shift lever to the oil seal seat, the hinge seat, and the cable support, it solves the problem of high shifting force in agricultural machinery gearboxes and effectively reduces the shifting force. The shift lever and cable support are reasonably arranged, and the cable is always in a straight line, which can avoid bending of the cable due to space constraints in the vehicle. Attached Figure Description

[0020] Figure 1 is a perspective view of this utility model.

[0021] Figure 2 is a magnified view of a portion of Figure 1.

[0022] In the diagram: 1. Gearbox; 2. Shifting mechanism; 21. Shift lever; 22. Hinge seat; 23. Oil seal seat; 24. Shift fork shaft; 25. Cable bracket; 26. Fixed pin I; 27. Fixed pin II. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] As shown in Figures 1 and 2, this embodiment provides a lever-type coaxial shifting device with high shifting force, including a gearbox 1 and a shifting mechanism 2 that is lever-type and disposed on the outside of the gearbox 1. The shifting mechanism 2 includes a shift lever 21, the middle left side of which is hinged to the hinge seat 22 of the gearbox 1 housing; the left end of the shift lever 21 is hinged to the shift fork shaft 24 of the gearbox 1, and the shift fork shaft 24 is fixed to the gearbox 1 housing by an oil seal seat 23; the right end of the shift lever 21 is connected to a cable bracket 25 by a cable.

[0026] As shown in Figures 1 and 2, the shifting mechanism 2 of this technical solution has a compact structure. It features an oil seal seat 23, a hinge seat 22, and a cable bracket 25 arranged along a straight line, connected to these three components via a shift lever 21, forming a lever-type high-shifting-force structure. This leverage principle effectively reduces shifting force, solving the problem of high shifting force in the agricultural machinery gearbox 1. Furthermore, due to the reasonable layout of the shift lever 21 and cable bracket 25, the cable remains straight, avoiding bending caused by space constraints, which would significantly increase shifting force. The shift fork shaft 24 is coaxially mounted with the left end of the shift lever 21 via the oil seal seat 23, effectively avoiding the problem of misalignment between the shift bracket and the shift fork shaft, which would lead to increased shifting force or shifting failure. In fact, through this lever-type high-shifting-force structure, the shifting mechanism 2 of this technical solution changes from traditional coaxial shifting to 90° shifting, achieving a labor-saving effect by changing the force transmission path by 90° through leverage.

[0027] In addition, the lever-type coaxial shifting device with large shifting force proposed in this utility model may also have the following additional technical features:

[0028] According to one embodiment of the present invention, the pull cable drives the shift lever 21 to rotate relative to the hinge seat 22, and the shift lever 21 drives the shift fork shaft 24 to move synchronously to achieve coaxial shifting.

[0029] In this technical solution, the cable applies external force through the shift lever, and the cable passes through the cable bracket 25 to drive the right end of the shift lever 21 to move up and down. The right side of the shift lever 21 is the power arm, and the left side of the shift lever 21 is the resistance arm. The left end of the shift lever 21 drives the coaxially set shift fork shaft 24 to move up and down. The shift fork shaft 24 is connected to the shift fork in the gearbox 1, thereby realizing the shifting operation of the gearbox 1.

[0030] According to one embodiment of the present invention, a pin hole I is provided in the middle of the left side of the shift lever 21, and a fixed pin I 26 that cooperates with the pin hole I is installed on the hinge seat 22, and the shift lever 21 rotates around the fixed pin I 26.

[0031] In this technical solution, the fixed pin I 26 includes pin I and cotter pin I. Pin I passes through pin hole I on shift lever 21 and pin hole on hinge seat 22, and is fixed by cotter pin I cooperating with pin I.

[0032] According to one embodiment of the present invention, the left end of the shift lever 21 is provided with a pin hole II, and a fixed pin II 27 that cooperates with the pin hole II is installed on the oil seal seat 23. The fixed pin II 27 passes through the oil seal seat 23, the shift lever 21 and the shift fork shaft 24 which are coaxially arranged, and the shift lever 21 coaxially drives the shift fork shaft 24 to move.

[0033] In this technical solution, the fixed pin Ⅱ27 includes pin Ⅱ and cotter pin Ⅱ. Pin Ⅱ passes through pin hole Ⅱ of shift lever 21, pin hole on oil seal seat 23, and pin hole of shift fork shaft 24, and is fixed by cotter pin Ⅱ cooperating with pin Ⅱ.

[0034] According to one embodiment of the present invention, the left end of the shift lever 21 is provided with a wiring hole, and a pull wire that mates with the wiring hole is installed on the pull wire bracket 25, and the other end of the pull wire is connected to the shift control lever.

[0035] In this technical solution, the cable bracket 25 is fixed to the housing of the gearbox 1 by a mounting base, and the cable bracket 25 is provided with a guide hole through which the cable passes.

[0036] According to one embodiment of the present invention, the hinge seat 22 is close to the oil seal seat 23 at the left end, the left side of the shift lever 21 is the resistance arm, and the right side of the shift lever 21 is the power arm.

[0037] In this technical solution, the movement of the shift fork shaft 24 is achieved by changing the force transmission path by 90° through a lever, changing the traditional coaxial shifting to 90° reversing shifting, thus achieving a labor-saving effect and solving the problem of large shifting force in the agricultural machinery gearbox 1.

[0038] The usage process of the above embodiments is as follows:

[0039] As shown in Figures 1 and 2, the cable applies external force through the shift lever, passing through the cable bracket 25 and driving the right end of the shift lever 21 to rise and fall. The middle left side of the shift lever 21 is hinged to the hinge seat 22 of the gearbox 1 housing and rotates around the fixed pin I 26. Its left end is hinged to the shift fork shaft 24 and coaxially connected through the fixed pin II 27. The right side of the shift lever 21 is the power arm, and the left side is the resistance arm. When the right side rises and falls, the left side drives the shift fork shaft 24 to rise and fall synchronously. The shift fork shaft 24 is connected to the shift fork inside the gearbox 1, thereby realizing the gearbox 1 shifting direction.

[0040] This device utilizes the lever principle to change the traditional coaxial shifting to 90° reversing shifting. By changing the force transmission path by 90°, it effectively reduces the shifting force and solves the problem of high shifting force in agricultural machinery gearbox 1. At the same time, the reasonable layout keeps the pull cable straight, avoiding bending that would increase the shifting force. Furthermore, the shift fork shaft 24 and the shift lever 21 are coaxially set to avoid shifting problems caused by misalignment.

[0041] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A lever-type coaxial shifting device with high shifting force, characterized in that, The transmission includes a gearbox (1) and a shift mechanism (2) mounted on the outside of the gearbox (1) in a lever-like manner. The shift mechanism (2) includes a shift lever (21), the middle left side of which is hinged to a hinge seat (22) on the gearbox (1) housing. The left end of the shift lever (21) is hinged to a shift fork shaft (24) of the gearbox (1). The shift fork shaft (24) is fixed to the gearbox (1) by an oil seal seat (23). 1) On the housing; the right end of the shift lever (21) is connected to the pull wire bracket (25) by a pull wire; the left end of the shift lever (21) is provided with a pin hole II, and a fixed pin II (27) that cooperates with the pin hole II is installed on the oil seal seat (23). The fixed pin II (27) passes through the oil seal seat (23), the shift lever (21) and the shift fork shaft (24) which are coaxially arranged. The shift lever (21) coaxially drives the shift fork shaft (24) to move.

2. The lever-type coaxial shifting device with large shifting force as described in claim 1, characterized in that, The pull cable drives the shift lever (21) to rotate relative to the hinge seat (22), and the shift lever (21) drives the shift fork shaft (24) to move synchronously to achieve coaxial shifting.

3. The lever-type coaxial shifting device with large shifting force as described in claim 1, characterized in that, The shift lever (21) has a pin hole I in the middle of its left side, and a fixed pin I (26) that mates with the pin hole I is installed on the hinge seat (22). The shift lever (21) rotates around the fixed pin I (26).

4. The lever-type coaxial shifting device with large shifting force as described in claim 1, characterized in that, The left end of the shift lever (21) is provided with a wiring hole, and a pull wire that matches the wiring hole is installed on the pull wire bracket (25). The other end of the pull wire is connected to the shift control lever.

5. The lever-type coaxial shifting device with large shifting force as described in claim 1, characterized in that, The hinge seat (22) is close to the oil seal seat (23) at the left end. The left side of the shift lever (21) is the resistance arm, and the right side of the shift lever (21) is the power arm.

Images