Tractor clutch mechanism and tractor

Abstract

The present invention relates to a tractor clutch mechanism and a tractor, wherein the clutch mechanism comprises a clutch pedal, a booster spring, a flexible shaft, a fork assembly, a bearing seat, a flexible shaft fixing bracket, a self-aligning release bearing and a clutch, wherein the clutch pedal is hinged on the flexible shaft fixing bracket and one end of the clutch pedal is connected to the upper end of the flexible shaft, the lower end of the flexible shaft is connected to one end of the fork assembly, the other end of the fork assembly is fixed to the bearing seat, and the self-aligning release bearing is press-mounted on the bearing seat and is coaxial with the clutch axis; the booster spring is arranged obliquely, the upper end of the booster spring is connected to the clutch pedal, and the lower end is connected to the flexible shaft fixing bracket; when the clutch pedal is stepped on, the booster spring is in a stretched state. By setting the self-aligning release bearing, the position can be automatically adjusted to ensure concentric rotation with the clutch and reduce wear; the booster spring can ensure that the bearing has a certain pre-pressure with the clutch pressure claw after assembly, and the pre-pressure of the bearing and the clutch pressure claw is ensured while reducing the clutch pedal stepping force.

Description

Technical Field

[0001] The invention relates to the technical field of tractor clutch, and in particular to a tractor clutch mechanism and a tractor. Background Art

[0002] There is a 2-3mm free gap between the release bearing and the clutch claw of the existing tractor clutch operating mechanism, and the release bearing does not have a self-aligning function, which increases the pedal stroke and reduces the operating comfort; and the wear caused by the non-concentricity of the release bearing and the clutch cannot be avoided. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a tractor clutch mechanism and a tractor in view of the deficiencies of the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a tractor clutch mechanism, comprising a clutch pedal, a booster spring, a flexible shaft, a fork assembly, a bearing seat, a flexible shaft fixing bracket, a self-aligning release bearing and a clutch, wherein the clutch pedal is hinged on the flexible shaft fixing bracket and one end of the clutch pedal is connected to the upper end of the flexible shaft, the lower end of the flexible shaft is connected to one end of the fork assembly, the other end of the fork assembly is fixed to the bearing seat, and the self-aligning release bearing is press-fitted on the bearing seat and is coaxial with the clutch axis;

[0005] The booster spring is arranged obliquely, the upper end of the booster spring is connected to the clutch pedal, and the lower end is connected to the flexible shaft fixing bracket; when the clutch pedal is stepped on, the booster spring is in a stretched state.

[0006] The beneficial effects of the present invention are as follows: the present invention arranges a self-aligning release bearing, which can automatically adjust its position to ensure concentric rotation with the clutch and reduce wear; the assist spring can ensure that the bearing has zero clearance with the clutch claw after assembly and has a certain pre-pressure, which reduces the clutch pedal force while ensuring the pre-pressure of the bearing and the clutch claw, and can effectively ensure the normal operation of the clutch system.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the clutch pedal includes a pedal arm and a pedal, one end of the pedal arm is hinged to the flexible shaft fixing bracket, the pedal is installed on the other end of the pedal arm, and the first end of the booster spring is connected to the pedal arm; the lever ratio between the center of the pedal surface of the pedal and the connection point of the booster spring on the pedal arm is 4 to 7.

[0009] The beneficial effect of adopting the above further scheme is: by limiting the lever ratio between the center of the pedal surface of the pedal and the connection point of the assist spring on the pedal arm, the assist effect of the assist spring can be effectively controlled so that the preload between the bearing and the clutch pressure claw meets the appropriate requirements.

[0010] Furthermore, a lever ratio between the center of the pedal surface of the pedal and the connection point of the assist spring on the pedal arm is 5.

[0011] Furthermore, the distance between the connection point of the booster spring on the pedal arm and the hinge point of the pedal arm on the flexible shaft fixing bracket is a, and a is 35 mm to 40 mm.

[0012] The beneficial effect of adopting the above further scheme is: by limiting the distance between the connection point of the booster spring on the pedal arm and the hinge point of the pedal arm on the flexible shaft fixing bracket, the length of the booster spring is prevented from changing significantly during the pedaling process, thereby avoiding a reduction in the boosting effect of the booster spring.

[0013] Furthermore, the a is 37 mm.

[0014] Furthermore, when the clutch pedal is stepped on, the angle between the assist spring and the vertical direction gradually decreases.

[0015] The beneficial effect of adopting the above further solution is that by setting the angle between the assist spring and the vertical direction to gradually decrease when the clutch pedal is stepped on, the consumption of the restoring force of the assist spring is avoided by the change of the angle.

[0016] Furthermore, the included angle between the assist spring and the vertical direction is α, and α is 20° to 40°.

[0017] Furthermore, when the clutch pedal is not stepped on, the length of the assist spring is b, and when the clutch pedal is stepped on to the limit position, the length of the assist spring is c, and c=(9.94-9.96)b.

[0018] The beneficial effect of adopting the above further solution is: by limiting the length of the assist spring before and after the clutch pedal is stepped on, the assist effect of the assist spring will not be significantly weakened before and after the clutch pedal is stepped on.

[0019] Furthermore, the pedal is rotationally connected to the other end of the pedal arm via a torsion spring.

[0020] The beneficial effect of adopting the above further solution is that the pedal is rotatably connected to the pedal arm through the torsion spring, so that when the pedal is stepped on, it fits well with the human foot and is more comfortable.

[0021] A tractor comprises the clutch mechanism as described above.

[0022] The beneficial effects of the present invention are as follows: the tractor of the present invention is provided with a self-aligning release bearing, and the bearing can automatically adjust its position to ensure concentric rotation with the clutch and reduce wear; the booster spring can ensure zero clearance between the bearing and the clutch claw after assembly and a certain pre-pressure, which reduces the clutch pedal force while ensuring the pre-pressure of the bearing and the clutch claw, and can effectively ensure the normal operation of the clutch system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the clutch mechanism of the present invention.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Pedal; 2. Pedal arm; 3. Flexible shaft; 4. Shift fork; 5. Clutch rocker arm; 6. Self-aligning release bearing; 7. Bearing seat; 8. Clutch; 9. Power assist spring; 10. Flexible shaft fixing bracket; 101. Upper bracket; 102. Lower bracket; 103. Flexible shaft tube. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a tractor clutch mechanism of this embodiment includes a clutch pedal, a booster spring 9, a flexible shaft 3, a fork assembly, a bearing seat 7, a flexible shaft fixing bracket 10, a self-aligning release bearing 6 and a clutch 8, wherein the clutch pedal is hinged on the flexible shaft fixing bracket 10 and one end of the clutch pedal is connected to the upper end of the flexible shaft 3, the lower end of the flexible shaft 3 is connected to one end of the fork assembly, and the other end of the fork assembly is fixed to the bearing seat 7, and the self-aligning release bearing 6 is pressed onto the bearing seat 7 and is coaxial with the axis of the clutch 8;

[0029] The two ends of the booster spring 9 are respectively a first end and a second end, the first end is connected to the clutch pedal, the second end is connected to the flexible shaft fixing bracket 10, and the second end is located below the first end; when the clutch pedal is stepped on, the booster spring 9 is in a stretched state.

[0030] In this embodiment, a self-aligning release bearing is provided, which can automatically adjust its position to ensure concentric rotation with the clutch and reduce wear; the assist spring can ensure that the bearing has zero clearance with the clutch pressure claw after assembly and has a certain pre-pressure, thereby reducing the pedaling force of the clutch pedal and ensuring the pre-pressure of the bearing and the clutch pressure claw, which can effectively ensure the normal operation of the clutch system.

[0031] like Figure 1 As shown, the flexible shaft fixing bracket 10 of this embodiment includes an upper bracket 101, a lower bracket 102 and a flexible shaft tube 103, and the upper and lower ends of the flexible shaft tube 103 are detachably connected to the upper bracket 101 and the lower bracket 102 respectively by bolts and nuts; the flexible shaft 3 is inserted into the flexible shaft tube 103, and a through hole is provided on the bolt on the upper bracket 101, and the second end of the assist spring 9 is inserted into the through hole.

[0032] like Figure 1 As shown, the shift fork assembly of this embodiment includes a shift fork 4 and a clutch rocker arm 5, the upper end of the clutch rocker arm 5 is connected to the end of the flexible shaft 3 passing through the lower end of the flexible shaft tube 103, the lower end of the clutch rocker arm 5 is fixedly connected to the lower end of the shift fork 4 by bolts, and the upper end of the shift fork 4 is clamped with the side wall of the bearing seat 7 by a spring. The shift fork 4 is arranged vertically, and the clutch rocker arm 5 is arranged obliquely, and the upper end of the clutch rocker arm 5 is inclined in the direction away from the bearing seat 7. A positioning slideway can be set on the lower bracket 102, so that the clutch rocker arm 5 can slide along the slideway when being pulled by the flexible shaft 3, and at the same time drive the shift fork 4 to push the bearing seat 7 to squeeze the self-aligning release bearing 6, so that the self-aligning release bearing 6 presses the clutch 8 to achieve normal operation of the clutch system.

[0033] like Figure 1 As shown, the clutch pedal of this embodiment includes a pedal arm 2 and a pedal 1, one end of the pedal arm 2 is hinged to the upper bracket 101 of the flexible shaft fixing bracket 10, the pedal 1 is mounted on the other end of the pedal arm 2, and the first end of the booster spring 9 is connected to the pedal arm 2; the lever ratio between the center of the pedal surface of the pedal 1 and the connection point of the booster spring 9 on the pedal arm 2 is 4 to 6. Further preferably, the lever ratio between the center of the pedal surface of the pedal 1 and the connection point of the booster spring 9 on the pedal arm 2 is 5. By limiting the lever ratio between the center of the pedal surface of the pedal and the connection point of the booster spring on the pedal arm, the boosting effect of the booster spring can be effectively controlled so that the preload between the bearing and the clutch pressure claw meets the appropriate requirements.

[0034] like Figure 1 As shown, the pedal arm 2 of this embodiment is in an L-shaped structure, the end of the longer section thereof is hinged on the flexible shaft fixing frame 10, and the pedal 1 is arranged at the end of the shorter section thereof.

[0035] In this embodiment, a positioning pin may be provided on the pedal arm 2 so that the first end of the booster spring 9 is hooked on the positioning pin to achieve the connection between the booster spring and the pedal arm.

[0036] like Figure 1 As shown, in this embodiment, the distance between the connection point of the booster spring 9 on the pedal arm 2 and the hinge point of the pedal arm 2 on the flexible shaft fixing bracket 10 is a, and a is 35mm-40mm. Further preferably, a is 37mm. The distance between the hinge point of the pedal arm 2 on the flexible shaft fixing bracket 10 and the center of the pedal surface of the pedal 1 is d, and d is 140-240mm, preferably 185mm. The lever ratio between the center of the pedal surface of the pedal 1 and the connection point of the booster spring 9 on the pedal arm 2 is the ratio of d to a. By limiting the distance between the connection point of the booster spring on the pedal arm and the hinge point of the pedal arm on the flexible shaft fixing bracket, the length of the booster spring is prevented from changing significantly during the pedaling process, thereby avoiding a reduction in the boosting effect of the booster spring.

[0037] In the process of stepping on the clutch pedal of this embodiment, the angle between the booster spring 9 and the vertical direction gradually decreases. The angle between the booster spring 9 and the vertical direction is α, which is 20° to 40°, preferably 30°. Figure 1 As shown, the booster spring 9 of this embodiment is arranged obliquely, and the second end of the booster spring 9 extends obliquely in a direction away from the pedal arm 2. By setting the angle between the booster spring and the vertical direction to gradually decrease during the stepping of the clutch pedal, the consumption of the restoring force of the booster spring is avoided by the change of the angle.

[0038] When the clutch pedal of this embodiment is not stepped on, the length of the booster spring 9 is b. When the clutch pedal is stepped on to the limit position, the length of the booster spring 9 is c, wherein c=(9.94-9.96)b, preferably c=9.95b. By limiting the length of the booster spring before and after the clutch pedal is stepped on, the booster effect of the booster spring will not be significantly weakened before and after the clutch pedal is stepped on, and the booster spring can always ensure the preload between the bearing and the clutch claw. When the pedal of this embodiment is not stepped on, the booster spring is in a stretched state. At this time, b is 140mm, c is 123mm, and the restoring force of the booster spring is 50N. Due to a certain lever ratio, the actual booster spring is 8.3N-12.5N, preferably 10N (at this time, the lever ratio between the center of the pedal surface of the pedal 1 and the connection point of the booster spring 9 on the pedal arm 2 is 5); that is, when the pedal is rotated to the limit position, the length of the booster spring is shortened by 17mm, and the restoring force of the booster spring changes slightly.

[0039] The distance between the attachment point of the assist spring on the pedal arm and the hinge point of the pedal arm is shorter in this embodiment, so that the length of the assist spring changes less during the entire rotation process of the pedal arm, and the assist effect is better.

[0040] The pedal 1 of this embodiment is rotatably connected to the other end of the pedal arm 2 through a torsion spring (not shown in the structural diagram). Specifically, two parallel connecting plates can be set on the back of the pedal 1, and a connecting shaft is rotatably connected between the two connecting plates. The connecting shaft passes through the pedal arm 2 and is fixed to the pedal arm 2. Then two torsion springs are sleeved on the connecting shaft. The two torsion springs are respectively located on both sides of the pedal arm, one end of the torsion spring is fixed to the pedal arm 2, and the other end of the torsion spring is fixed to the connecting plate; the pedal is rotatably connected to the pedal arm through the torsion spring, so that the pedal fits well with the human foot and is more comfortable when being stepped on.

[0041] Example 2

[0042] A tractor comprises a clutch mechanism as described in Example 1. The tractor of this embodiment is provided with a self-aligning release bearing, which can automatically adjust its position to ensure concentric rotation with the clutch and reduce wear; the booster spring can ensure zero clearance between the bearing and the clutch claw after assembly and a certain pre-pressure, which reduces the clutch pedal force while ensuring the pre-pressure between the bearing and the clutch claw, and can effectively ensure the normal operation of the clutch system.

[0043] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A tractor clutch mechanism, characterized in that: The invention comprises a clutch pedal, a booster spring (9), a flexible shaft (3), a shift fork assembly, a bearing seat (7), a flexible shaft fixing bracket (10), a self-aligning release bearing (6) and a clutch (8), wherein the clutch pedal is hinged on the flexible shaft fixing bracket (10) and one end of the clutch pedal is connected to the upper end of the flexible shaft (3), the lower end of the flexible shaft (3) is connected to one end of the shift fork assembly, the other end of the shift fork assembly is fixed to the bearing seat (7), and the self-aligning release bearing (6) is press-fitted on the bearing seat (7) and is coaxial with the axis of the clutch (8); The booster spring (9) is arranged obliquely, the upper end of the booster spring (9) is connected to the clutch pedal, and the lower end is connected to the flexible shaft fixing bracket (10); when the clutch pedal is stepped on, the booster spring (9) is in a stretched state; The clutch pedal comprises a pedal arm (2) and a pedal (1), one end of the pedal arm (2) is hinged to the flexible shaft fixing bracket (10), and the pedal (1) is mounted on the other end of the pedal arm (2); the booster spring is arranged obliquely, the first end of the booster spring (9) is connected to the pedal arm (2), and the second end of the booster spring extends obliquely in a direction away from the pedal arm; the lever ratio between the center of the pedal surface of the pedal (1) and the connection point of the booster spring (9) on the pedal arm (2) is 4 to 7; When the clutch pedal is stepped on, the angle between the booster spring (9) and the vertical direction gradually decreases; The angle between the booster spring (9) and the vertical direction is α, and α is 20° to 40°; When the clutch pedal is not stepped on, the length of the booster spring (9) is b, and when the clutch pedal is stepped on to the limit position, the length of the booster spring (9) is c, where c=(9.94-9.96)b; The distance between the connection point of the booster spring (9) on the pedal arm (2) and the hinge point of the pedal arm (2) on the flexible shaft fixing bracket (10) is a, and a is 35 mm to 40 mm; The flexible shaft fixing bracket comprises an upper bracket, a lower bracket and a flexible shaft tube, and the upper and lower ends of the flexible shaft tube are detachably connected to the upper bracket and the lower bracket respectively by bolts and nuts; the flexible shaft is inserted into the flexible shaft tube; The shift fork assembly comprises a shift fork and a clutch rocker arm, the upper end of the clutch rocker arm is connected to one end of the flexible shaft passing through the lower end of the flexible shaft tube, the lower end of the clutch rocker arm is fixedly connected to the lower end of the shift fork by bolts, and the upper end of the shift fork is clamped with the side wall of the bearing seat by a spring; the shift fork is arranged vertically, and the clutch rocker arm is arranged obliquely, and the upper end of the clutch rocker arm is inclined in a direction away from the bearing seat; a positioning slideway is arranged on the lower bracket, so that the clutch rocker arm can slide along the positioning slideway when being pulled by the flexible shaft, and at the same time drives the shift fork to push the bearing seat to squeeze the self-aligning release bearing, so that the self-aligning release bearing presses the clutch; The pedal is rotatably connected to the other end of the pedal arm through a torsion spring; two parallel connecting plates are provided on the back of the pedal, a connecting shaft is rotatably connected between the two connecting plates, the connecting shaft passes through the pedal arm and is fixed to the pedal arm, and then two torsion springs are sleeved on the connecting shaft, the two torsion springs are respectively located on both sides of the pedal arm, one end of the torsion spring is fixed to the pedal arm, and the other end of the torsion spring is fixed to the connecting plate; The pedal arm has an L-shaped structure, with the end of its longer section hinged on the flexible shaft fixing frame, and the end of its shorter section being provided with a pedal; the distance between the hinge point of the pedal arm on the flexible shaft fixing frame and the center of the pedal surface of the pedal is d, and d is 140 to 240 mm; the lever ratio between the center of the pedal surface of the pedal and the connection point of the assist spring on the pedal arm is the ratio of d to a.

2. A tractor clutch mechanism according to claim 1, characterized in that: The lever ratio between the center of the pedal surface of the pedal (1) and the connection point of the booster spring (9) on the pedal arm (2) is 5.

3. A tractor clutch mechanism according to claim 1, characterized in that: The a is 37 mm.

4. A tractor, characterized in that: Comprising the clutch mechanism as described in any one of claims 1 to 3.

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