Pull cable gear shift control mechanism for tractor

Abstract

The utility model belongs to tractor's pull -in line formula gear shift operating mechanism, better satisfied operation light weight and the requirement of gear shift accuracy, including casing, long gear shift subassembly and short gear shift subassembly, the front end of long gear shift transmission rod is provided with the first gear shift rocker that drives its rotation, the top of front end is provided with the first gear selection rocker that drives its axial movement, the front end of short gear shift transmission rod is provided with the second gear shift rocker that drives its rotation, the top of front end is provided with the second gear selection rocker that drives its axial movement, first gear shift rocker, first gear selection rocker, second gear shift rocker and second gear selection rocker all are connected with outside pull -in line through connecting hole and are driven to rotate by it. The utility model provides tractor's accessory technical field relates to a tractor's pull -in line formula gear shift operating mechanism.

Description

Technical Field

[0001] This utility model belongs to the technical field of tractor parts and relates to a cable-operated gear shifting control mechanism for tractors. Background Technology

[0002] Vehicle speed changes require gear shifting. The gear shifting mechanism, in conjunction with the gearbox, changes the gear ratio and direction of travel, thereby enabling changes in vehicle speed, output power, and forward / reverse movement to adapt to different driving conditions.

[0003] Most existing medium-to-high horsepower tractors without full-power shifting use long shift levers for gear shifting. These levers have long travel distances, making them prone to collision during operation. Furthermore, the long lever arms mean that forceful gear shifting can damage internal components, especially when shifting gears is difficult. Over time, this wear and tear can lead to excessive free travel.

[0004] For example, Chinese utility model patent CN222950393U (publication date: 2025.06.06) discloses a four-bar lever gear shifting control assembly, including a side control housing, a gear selection housing fixedly connected to the side control housing, a main gear selection shaft and a secondary gear selection shaft rotatably provided on opposite side walls of the gear selection housing, a main lever slide rod and a secondary lever slide rod rotatably provided in parallel at the end of the side control housing; a main control seat with a fixed position is fixedly provided on the top of the side control housing, a main gear selection adjustment seat that swings longitudinally is hinged to the main control seat, a main gear selection lever is hinged to the main gear selection adjustment seat, a main gear selection rocker arm is vertically fixed to the main gear selection shaft, and the lower end of the main gear selection lever is hinged to the swing end of the main gear selection rocker arm. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a cable-operated gear shifting control mechanism for tractors, which better meets the requirements of lightweight operation and precise gear shifting.

[0006] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0007] A cable-operated gear shifting control mechanism for a tractor includes a housing, a long gear shifting assembly, and a short gear shifting assembly. The long gear shifting assembly includes a long gear shifting transmission rod, and the short gear shifting assembly includes a short gear shifting transmission rod. The rear end of the long gear shifting transmission rod is provided with a first shift head that drives gear selection by sliding and drives gear shifting by rotating. The rear end of the short gear shifting transmission rod is provided with a second shift head that drives gear selection by sliding and drives gear shifting by rotating. The front end of the long gear shifting transmission rod is provided with a first gear shifting rocker arm that drives its rotation, and a first gear selection rocker arm that drives its axial movement is provided above the front end. The front end of the short gear shifting transmission rod is provided with a second gear shifting rocker arm that drives its rotation, and a second gear selection rocker arm that drives its axial movement is provided above the front end. The first gear shifting rocker arm, the first gear selection rocker arm, the second gear shifting rocker arm, and the second gear selection rocker arm are all connected to an external cable through connecting holes and driven to rotate by the cable.

[0008] In the aforementioned cable-operated gear shifting mechanism for a tractor, the axis of the long shift rocker arm is arranged along the axial direction of the long shift transmission rod, and the axis of the long selection rocker arm is arranged along the radial direction of the long shift transmission rod; the axis of the short shift rocker arm is arranged along the axial direction of the short shift transmission rod, and the axis of the short selection rocker arm is arranged along the radial direction of the short shift transmission rod.

[0009] In the aforementioned cable-operated gear shifting mechanism for a tractor, the front end of the long gear shifting transmission rod is provided with a first gear selection annular groove, the end of the first gear selection rocker arm is connected to a first gear selection paddle via a spline, and the lower end of the first gear selection paddle is provided with a first gear selection head fitted in the first gear selection annular groove and driving the long gear shifting transmission rod to move axially; the front end of the short gear shifting transmission rod is provided with a second gear selection annular groove, the end of the second gear selection rocker arm is connected to a second gear selection paddle via a spline, and the lower end of the second gear selection paddle is provided with a second gear selection head fitted in the second gear selection annular groove and driving the short gear shifting transmission rod to move axially; the spline connection structure can be replaced with other structures, such as a hexagonal bushing fit structure, etc.; preferably, the first gear selection head and the second gear selection head are spherical structures.

[0010] In the above-mentioned cable-operated gear shifting control mechanism for tractors, the first gear selection rocker arm and the second gear selection rocker arm are rotatably mounted on the housing through mounting holes and are axially fixed relative to the housing. The housing is covered with an upper cover plate corresponding to the first gear selection lever and the second gear selection lever. The axial fixing method can be an axial limiting structure such as bolts or locking plates.

[0011] In the aforementioned cable-operated gear shifting mechanism for a tractor, the first gear shifting rocker arm is coaxially arranged with the long gear shifting transmission rod and connected by spline transmission; the second gear shifting rocker arm is coaxially arranged with the short gear shifting transmission rod and connected by spline transmission.

[0012] In the aforementioned cable-operated gear shifting mechanism for a tractor, a first spacer is provided on the long gear shifting transmission rod, and a first spring is provided between the first spacer and the side wall of the housing; a second spacer is provided on the short gear shifting transmission rod, and a second spring is provided between the second spacer and the side wall of the housing; the first spring and the second spring can also be replaced by a pneumatic reset device or the like.

[0013] In the aforementioned cable-operated gear shifting control mechanism for a tractor, a transmission rod limiting plate is fixed on the side wall of the housing. The lower end of the transmission rod limiting plate is provided with slots corresponding to the long and short transmission rods. The long and short transmission rods are respectively provided with diameter-reduced limiting grooves. The slots slide in the limiting grooves and form axial limiting structures for the long and short transmission rods. In this invention, adjustable screws or elastic retaining rings can also be used for limiting.

[0014] In the aforementioned cable-operated gear shifting mechanism for tractors, an extension section is provided at the rear end of the long gear shifting transmission rod, and the extension section is inserted into the through hole of the housing to form an auxiliary support structure; the through hole is sealed with a cup-shaped plug.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This invention provides a cable-operated gear shifting control mechanism for tractors, employing a four-set cable-driven rocker arm structure. This avoids the space constraints and operational inconveniences that may arise when shifting gears using the main and auxiliary gear shift levers, better adapting to the operational needs within the tractor cab. Furthermore, the gear selection and shifting actions are independent, with each lever independently controlled, completely eliminating interference between different operating actions and resulting in more precise gear shifting. In summary, this invention better meets the requirements of lightweight operation and precise gear shifting in tractor gear shifting control mechanisms. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 yes Figure 1 A sectional view (axial direction of the long shift lever);

[0019] Figure 3 This is a diagram of the internal structure of this utility model;

[0020] Reference numerals: 1. Housing; 11. Top cover plate; 12. Transmission rod limiting plate; 2. Long shift transmission rod; 21. First shift head; 22. First shift rocker arm; 23. First selection rocker arm; 24. First selection annular groove; 25. First selection paddle; 26. First selection head; 27. First spacer; 28. First spring; 29. ​​Extension section; 3. Short shift transmission rod; 31. Second shift head; 32. Second shift rocker arm; 33. Second selection rocker arm; 34. Second selection annular groove; 35. Second selection paddle; 36. Second selection head; 37. Second spacer; 38. Second spring. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0022] A cable-operated gear shifting control mechanism for a tractor includes a housing 1, a long gear shifting assembly, and a short gear shifting assembly. The long gear shifting assembly includes a long gear shifting transmission rod 2, and the short gear shifting assembly includes a short gear shifting transmission rod 3. The rear end of the long gear shifting transmission rod 2 is provided with a first shift head 21 that drives gear selection by sliding and drives gear shifting by rotating. The rear end of the short gear shifting transmission rod 3 is provided with a second shift head 31 that drives gear selection by sliding and drives gear shifting by rotating. The front end of the long gear shifting transmission rod 2 is provided with a first gear shifting rocker arm 22 that drives its rotation, and a first gear selection rocker arm 23 that drives its axial movement is provided above the front end. The front end of the short gear shifting transmission rod 3 is provided with a second gear shifting rocker arm 32 that drives its rotation, and a second gear selection rocker arm 33 that drives its axial movement is provided above the front end. The first gear shifting rocker arm 22, the first gear selection rocker arm 23, the second gear shifting rocker arm 32, and the second gear selection rocker arm 33 are all connected to an external cable through a connecting hole and driven to rotate by the cable.

[0023] The shifting principle of this embodiment is as follows: An external cable pulls the first shifting rocker arm 23 through the connecting hole on the first shifting rocker arm 23 to rotate. The first shifting rocker arm 23, after being transmitted through a transmission structure, drives the long shift transmission rod to move axially. The axial movement of the long shift transmission rod drives the first shift head 21 to move left and right. The left and right movement of the first shift head 21 positions it in the slot of the shift block on different shift fork shafts, or in the slot of the shift fork, thus enabling selection of different shift fork shafts or shift forks and completing gear selection. An external cable pulls the first shifting rocker arm 22 through the connecting hole on the first shifting rocker arm 22 to rotate. The first shifting rocker arm 22, after being transmitted through a transmission structure, drives the long shift transmission rod to rotate. The rotation of the long shift transmission rod drives the first shift head 21 to rotate, thereby directly driving the shift fork or driving the shift fork shaft through the shift block to achieve its axial movement, realizing gear shifting. The shifting principle of the short shift assembly on the other side is the same.

[0024] In this embodiment, the axis of the long shift rocker arm is arranged along the axial direction of the long shift transmission rod 2, and the axis of the long selection rocker arm is arranged along the radial direction of the long shift transmission rod 2; the axis of the short shift rocker arm is arranged along the axial direction of the short shift transmission rod 3, and the axis of the short selection rocker arm is arranged along the radial direction of the short shift transmission rod 3.

[0025] In this embodiment, the specific structure of the long shift transmission rod 2 driven by the first gear selection rocker arm 23 is as follows: the front end of the long shift transmission rod 2 is provided with a first gear selection annular groove 24, the end of the first gear selection rocker arm 23 is connected to a first gear selection paddle 25 via a spline, and the lower end of the first gear selection paddle 25 is provided with a first gear selection head 26 assembled in the first gear selection annular groove 24 and driving the long shift transmission rod 2 to move axially. When the first gear selection rocker arm 23 rotates, it drives the first gear selection paddle 25 to rotate via the spline, and the gear selection paddle drives the long shift transmission rod 2 to move axially via the first gear selection head 26 at its lower end; the short shift transmission rod 2 is driven by the second gear selection rocker arm 33. The specific structure of lever 3 is as follows: the front end of the short shift transmission lever 3 is provided with a second shift annular groove 34, the end of the second shift rocker arm 33 is connected to a second shift lever block 35 via a spline, and the lower end of the second shift lever block 35 is provided with a second shift head 36 that is fitted in the second shift annular groove 34 and drives the short shift transmission lever 3 to move axially. The way the second shift rocker arm 33 drives the short shift transmission lever 3 is the same as the way the first shift rocker arm 23 drives the long shift transmission lever 2. The spline connection structure can be replaced with other structures, such as a hexagonal bushing fit structure. Preferably, the first shift head 26 and the second shift head 36 are spherical structures.

[0026] The first gear selector rocker arm 23 and the second gear selector rocker arm 33 are respectively rotatably mounted on the housing 1 through mounting holes and are axially fixed relative to the housing 1. The housing 1 is covered with an upper cover plate 11 corresponding to the first gear selector block 25 and the second gear selector block 35. The axial fixing method can be an axial limiting structure such as bolts or locking plates.

[0027] In this embodiment, the structure in which the first shift rocker arm 22 drives the long shift transmission rod 2 to rotate is such that the first shift rocker arm 22 and the long shift transmission rod 2 are coaxially arranged and connected by spline transmission; the structure in which the second shift rocker arm 32 drives the short shift transmission rod 3 to rotate is such that the second shift rocker arm 32 and the short shift transmission rod 3 are coaxially arranged and connected by spline transmission.

[0028] The aforementioned long shift transmission rod 2 is provided with a first spacer 27, and a first spring 28 is provided between the first spacer 27 and the side wall of the housing 1; the short shift transmission rod 3 is provided with a second spacer 37, and a second spring 38 is provided between the second spacer 37 and the side wall of the housing 1; the first spring 28 and the second spring 38 can also be replaced by a pneumatic reset device, etc. The gear selection process will compress the first spring 28 or the second spring 38, on the one hand to prevent the long shift transmission rod or the short shift transmission rod from causing the first gear selection rocker arm 23 or the second gear selection rocker arm 33 to shake due to vehicle vibration, and on the other hand, it can also drive the first gear selection rocker arm 23 or the second gear selection rocker arm 33 to return to its original position during gear selection.

[0029] A transmission rod limiting plate 12 is fixed on the side wall of the aforementioned housing 1. The lower end of the transmission rod limiting plate 12 is respectively provided with a slot corresponding to the long shift transmission rod 2 and the short shift transmission rod 3. The long shift transmission rod 2 and the short shift transmission rod 3 are respectively provided with a reduced diameter limiting groove. The slots slide in the limiting grooves and form an axial limiting structure for the long shift transmission rod 2 and the short shift transmission rod 3. Because it is thinner in the middle and thicker at both ends, the axial movement stroke of the long shift transmission rod 2 or the short shift transmission rod 3 can be well controlled, avoiding jamming.

[0030] The rear end of the aforementioned long shift transmission rod 2 is provided with an extension section 29. The extension section 29 is inserted into the through hole of the housing 1 and forms an auxiliary support structure. Since the position of the first shift head 21 is too far from the middle of the long shift transmission rod 2 and the cantilever is long, the auxiliary support structure can prevent the tail of the long shift transmission rod from bending during the shifting process, which would result in insufficient shifting stroke and failure to engage a gear. The through hole is sealed with a bowl-shaped plug to seal the inner cavity of the housing 1.

[0031] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A cable-operated gear shifting control mechanism for a tractor, comprising a housing (1), a long gear shifting assembly, and a short gear shifting assembly, wherein the long gear shifting assembly includes a long gear shifting transmission rod (2), and the short gear shifting assembly includes a short gear shifting transmission rod (3), wherein the rear end of the long gear shifting transmission rod (2) is provided with a first shift head (21) that drives gear selection by sliding and drives gear shifting by rotating, and the rear end of the short gear shifting transmission rod (3) is provided with a second shift head (31) that drives gear selection by sliding and drives gear shifting by rotating, characterized in that, The long shift transmission rod (2) is provided with a first shift rocker arm (22) for driving its rotation at the front end and a first selection rocker arm (23) for driving its axial movement above the front end. The short shift transmission rod (3) is provided with a second shift rocker arm (32) for driving its rotation at the front end and a second selection rocker arm (33) for driving its axial movement above the front end. The first shift rocker arm (22), the first selection rocker arm (23), the second shift rocker arm (32), and the second selection rocker arm (33) are all connected to an external pull cable through a connecting hole and driven to rotate by it.

2. The cable-operated gear shifting control mechanism for a tractor according to claim 1, characterized in that, The front end of the long shift transmission rod (2) is provided with a first shift annular groove (24), and the end of the first shift rocker arm (23) is connected to a first shift paddle (25) via a spline. The lower end of the first shift paddle (25) is provided with a first shift head (26) that is fitted in the first shift annular groove (24) and drives the long shift transmission rod (2) to move axially. The front end of the short shift transmission rod (3) is provided with a second shift annular groove (34), and the end of the second shift rocker arm (33) is connected to a second shift paddle (35) via a spline. The lower end of the second shift paddle (35) is provided with a second shift head (36) that is fitted in the second shift annular groove (34) and drives the short shift transmission rod (3) to move axially.

3. The cable-operated gear shifting control mechanism for a tractor according to claim 2, characterized in that, The first gear selector rocker arm (23) and the second gear selector rocker arm (33) are respectively rotatably mounted on the housing (1) through mounting holes and are axially fixed relative to the housing (1). The housing (1) is covered with an upper cover plate (11) corresponding to the first gear selector block (25) and the second gear selector block (35).

4. The cable-operated gear shifting control mechanism for a tractor according to claim 1, characterized in that, The first shift rocker arm (22) is coaxially arranged with the long shift transmission rod (2) and connected by spline transmission; the second shift rocker arm (32) is coaxially arranged with the short shift transmission rod (3) and connected by spline transmission.

5. A cable-operated gear shifting control mechanism for a tractor according to claim 1, characterized in that, The long shift transmission rod (2) is provided with a first spacer (27), and a first spring (28) is provided between the first spacer (27) and the side wall of the housing (1); the short shift transmission rod (3) is provided with a second spacer (37), and a second spring (38) is provided between the second spacer (37) and the side wall of the housing (1).

6. A cable-operated gear shifting control mechanism for a tractor according to claim 2, characterized in that, A transmission rod limiting plate (12) is fixed on the side wall of the housing (1). The lower end of the transmission rod limiting plate (12) is provided with a slot corresponding to the long shift transmission rod (2) and the short shift transmission rod (3). The long shift transmission rod (2) and the short shift transmission rod (3) are respectively provided with a reduced diameter limiting groove. The slot slides in the limiting groove and forms an axial limiting structure for the long shift transmission rod (2) and the short shift transmission rod (3).

7. A cable-operated gear shifting control mechanism for a tractor according to claim 1, characterized in that, The rear end of the long shift transmission rod (2) is provided with an extension section (29), which is inserted into the through hole of the housing (1) to form an auxiliary support structure.

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