CN112648302A - Automatic clutch device of tractor - Google Patents

Abstract

The invention discloses an automatic clutch device of a tractor, which comprises an engine, an active friction plate, a gearbox, a clutch plate, an elastic pushing mechanism and a hydraulic driving device, wherein the engine is provided with a crankshaft, the active friction plate is arranged at the shaft end part of the crankshaft of the engine, the gearbox is provided with an output shaft, the clutch plate is movably sleeved at the output end of the output shaft of the gearbox in a free advancing and retreating manner, the elastic pushing mechanism is used for pushing the clutch plate to axially move away from the active friction plate so as to realize the disconnection between the clutch plate and the active friction plate, and the hydraulic driving device is used for driving the elastic pushing mechanism to move so as to push the clutch plate to axially move away from the active friction plate; according to the invention, the clutch pedal is not needed to be manually treaded, and the automatic clutch of the tractor can be realized only by using an external hydraulic driving device, so that the feet of a driver are liberated, and the driving comfort level of the tractor is improved.

Description

Automatic clutch device of tractor

Technical Field

The invention relates to the field of agricultural machinery, in particular to an automatic clutch device of a tractor.

Background

A tractor is a common agricultural machine, and is used for towing and driving a working machine to complete various mobile operations. At present, the clutch of the high-power tractor on the market is required to be disconnected or connected by the operation of the clutch pedal, the action of manually operating the clutch pedal completely depends on the experience and the feeling of a driver, the operation experience of the driver is extremely high, if the clutch is improperly operated, a half-clutch state can occur when the half-clutch state is not necessary, the clutch is seriously abraded under the half-clutch state, and the damage to the clutch is extremely large,

in addition, in the process of driving the tractor, a driver needs to continuously tread a clutch pedal, and the long-time operation can bring heavy burden to the driver.

Disclosure of Invention

The invention aims to provide an automatic clutch device of a tractor, which can realize the automatic clutch of the tractor only by using an external hydraulic driving device without manually treading a clutch pedal, liberates the feet of a driver and improves the driving comfort.

Another object of the present invention is to provide an automatic clutch device for a tractor, which can precisely operate the clutch device by using an external hydraulic driving device, precisely perform the disconnection and connection of the clutch device, and does not depend on the experience and feeling of a driver.

Another object of the present invention is to provide an automatic clutch device for a tractor, which operates the clutch device by an external hydraulic driving device, has a fast response speed, and can realize fast gear shifting.

Another object of the present invention is to provide an automatic clutch device for a tractor, in which the release bearing and the sleeve are integrally formed as a single body, and the integral formation is more secure than the mating of the release bearing and the sleeve.

The present invention provides an automatic clutch device for a tractor, which comprises:

an engine having a crankshaft mounted thereon;

an active friction plate mounted on an axial end portion of the crankshaft of the engine;

the gearbox is provided with an output shaft;

the clutch plate is movably sleeved at the output end of the output shaft of the gearbox in a free advancing and retreating manner, and the clutch plate and the driving friction plate are axially arranged oppositely;

the elastic pushing mechanism is used for pushing the clutch plate to be away from the active friction plate axially, so that the clutch plate is disconnected from the active friction plate; and

the hydraulic driving device is used for driving the elastic pushing mechanism to move, so that the elastic pushing mechanism is squeezed and pushes the clutch plate to be axially away from the active friction plate, and the clutch plate is disconnected from the active friction plate; when the hydraulic thrust of the hydraulic driving device disappears, the reverse thrust generated by the elastic pushing mechanism pushes the clutch plate to axially approach and squeeze the driving friction plate, and the temporary joint of the clutch plate and the driving friction plate is realized.

According to an embodiment of the present invention, the elastic pressing mechanism includes a release bearing and a force transmission mechanism for pressing and moving the release bearing toward the clutch plate; the release bearing is sleeved outside the output shaft of the gearbox in a freely advancing and retreating manner;

wherein the hydraulic driving device is provided with a piston rod;

one end of the shaft force transmission mechanism is connected to the piston rod of the hydraulic driving device, the other end of the shaft force transmission mechanism is connected to the release bearing, and the shaft force transmission mechanism is used for transmitting the thrust of the hydraulic driving device to the release bearing, so that the release bearing moves along the output shaft of the gearbox and is close to the clutch plate, and the release bearing is in contact with the clutch plate and is squeezed to push the clutch plate to be close to the driving friction plate.

According to an embodiment of the present invention, the elastic pushing mechanism further includes a sleeve, and the sleeve is freely sleeved outside the output shaft of the transmission case; wherein the release bearing is mounted outside the sleeve.

According to an embodiment of the invention, the release bearing is integrally formed with the sleeve as a single piece.

According to an embodiment of the present invention, the elastic urging mechanism further includes an elastic lever member having a fulcrum swingably supported on the clutch plate, a point of force at which linear movement from the release bearing is input, and a point of action at which the linear movement is output to the clutch plate.

According to an embodiment of the present invention, the automatic clutch device further includes a connecting arm, one end of the connecting arm is fixedly mounted on the clutch plate, and the other end of the connecting arm faces the release bearing and can be in pressing contact with the release bearing; wherein the fulcrum of the elastic lever member is swingably supported on the connecting arm; and one side of the elastic lever component where the force point is located is fixed on the connecting arm; the side of the action point of the elastic lever component extends out of the connecting arm, and the part of the side of the action point of the elastic lever component extending out of the connecting arm faces the clutch plate and can be in pressing contact with the clutch plate.

According to an embodiment of the invention, the axial force transmission mechanism comprises a rocker arm, a rotating shaft and a separating fork, the rocker arm and the separating fork are respectively connected to the rotating shaft, one end of the rocker arm, which is far away from the rotating shaft, is connected to the output shaft of the hydraulic driving device, one end of the separating fork, which is far away from the rotating shaft, is connected to the separating bearing, and the rotating shaft is rotatably mounted on the body of the tractor.

According to an embodiment of the present invention, one end of the swing arm and one end of the separation fork are connected to both ends of the rotation shaft, respectively.

According to an embodiment of the invention, a driven friction plate matched with the driving friction plate is arranged on one surface of the clutch plate facing the driving friction plate; when the hydraulic thrust of the hydraulic driving device disappears, the reverse thrust generated by the elastic pushing mechanism pushes the driven friction plate on the clutch plate to axially approach and squeeze the driving friction plate, so that the temporary joint of the driven friction plate and the driving friction plate is realized.

According to one embodiment of the invention, the surfaces of the driving friction plate and the driven friction plate which are contacted with each other are rough and uneven.

According to an embodiment of the invention, the other end of the axial force transmission mechanism is connected to the sleeve.

According to an embodiment of the present invention, the automatic clutch device further includes a housing, and the housing houses the driving friction plate and the clutch plate.

According to an embodiment of the invention, the automatic clutch device further comprises a central controller, wherein the piston rod of the hydraulic drive device is controllably connected to the central controller to allow the central controller to control the piston rod of the hydraulic drive device to extend or retract, thereby driving the clutch plates to be pushed toward or away from the active friction plates.

According to an embodiment of the present invention, the automatic clutch device further includes a pressure sensor, and the pressure sensor is used for collecting hydraulic oil pressure information in the hydraulic driving device.

According to an embodiment of the present invention, the central controller is connected to the pressure sensor in a communication manner, and the central controller controls the hydraulic oil pressure in the hydraulic driving device, so as to control the extension or retraction of the piston rod of the hydraulic driving device.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an automatic clutch device of a tractor according to an embodiment of the present invention in a connected state.

Fig. 2 is a schematic structural view of the automatic clutch device of the tractor according to the above embodiment of the present invention in a disengaged state.

Fig. 3 is a schematic structural view of an elastic member in the automatic clutch apparatus of the tractor according to the above embodiment of the present invention.

Fig. 4 is a schematic structural view of an axial force transmission mechanism in the automatic clutch apparatus of the tractor according to the above embodiment of the present invention.

Fig. 5 is a control schematic diagram of the central controller according to the above embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 1 to 5 of the drawings, an automatic clutch apparatus for a tractor according to a preferred embodiment of the present invention includes an engine 10, an active friction plate 20, a clutch plate 30, a transmission case 40, a hydraulic driving device 50, and a resilient biasing mechanism 60.

The engine 10 is provided with a crankshaft 11, the driving friction plate 20 is mounted at an axial end of the crankshaft 11 of the engine 10, the transmission case 40 is provided with an output shaft 41, the clutch plate 30 is movably sleeved on an output end of the output shaft 41 of the transmission case 40 in a freely advancing and retreating manner, the clutch plate 40 and the driving friction plate 20 are arranged in an axial direction, the elastic pushing mechanism 60 is used for pushing the clutch plate 30 to axially separate from the driving friction plate 20 to realize the disconnection between the clutch plate 30 and the driving friction plate 20, the hydraulic driving device 50 is used for driving the elastic pushing mechanism 60 to move, and the elastic pushing mechanism 60 is squeezed to push the clutch plate 30 to axially separate from the driving friction plate 20 to realize the disconnection between the clutch plate 30 and the driving friction plate 20; when the hydraulic thrust of the hydraulic drive device 50 is removed, the reverse thrust generated by the elastic pushing mechanism 60 pushes the clutch plate 30 to axially approach and press the active friction plate 20, and the temporary engagement of the clutch plate 30 and the active friction plate 20 is realized.

In the above embodiment, the hydraulic driving device 50 is adopted to control the temporary engagement or disengagement between the clutch plate 30 and the active friction plate 20, so that the automatic clutch of the tractor can be realized only by using the hydraulic driving device without manually stepping on a clutch pedal, thereby freeing the feet of the driver and improving the driving comfort.

In the above embodiment, the accuracy of the hydraulic driving device 50 is controllable, so the tractor automatic clutch device of the embodiment can realize accurate clutch operation, and realize disconnection and connection of the clutch device accurately, without depending on experience and feeling of a driver.

In the above embodiment, the clutch device is operated by the external hydraulic driving device 50, the response speed is high, and the rapid engagement and disengagement of the whole clutch device can be realized.

Specifically, the hydraulic driving device 50 may be implemented as a hydraulic driving device such as a hydraulic oil cylinder or a hydraulic rod; the active friction plate 20 may be preferably implemented as a flywheel; the clutch plate 30 may be implemented as a friction clutch plate, and may preferably be implemented as a dry clutch plate. Here, the crankshaft 11 of the engine is disposed coaxially with the output shaft 41 of the transmission case 40, and the coaxiality of power transmission is maintained.

Specifically, a driven friction plate 31 matched with the driving friction plate 20 is arranged on one surface, facing the driving friction plate 20, of the clutch plate; the disconnection or temporary engagement of the clutch plate 30 with the driving friction plate 20 is the disconnection or temporary engagement of the driven friction plate 31 on the clutch plate 30 with the driving friction plate 20.

Furthermore, the surface of the driving friction plate 31 contacting the driven friction plate 20 is rough and uneven, and the rough and uneven surface includes surface unevenness, but not limited to surface unevenness, and also includes other structures that protrusions and grooves which are mutually matched are respectively arranged on two surfaces of the driving friction plate 31 contacting the driven friction plate 20 and increase the clamping stability of the two surfaces.

As shown in fig. 1, when the clutch plate 30 approaches the active friction plate 20 under the urging force of the elastic urging mechanism 60, the pressing force applied to the clutch plate 30 by the elastic urging mechanism 60 causes the friction force between the clutch plate 30 and the active friction plate 20 to be greatly increased, and the temporary engagement between the clutch plate 30 and the active friction plate 20 is realized; since the active friction plate 20 is mounted at the shaft end of the crankshaft 11 of the engine 10, the active friction plate 20 is forced to rotate along with the rotation of the crankshaft 11 of the engine 10, and further, the clutch plate 30 temporarily engaged with the active friction plate 20 is forced to rotate along with the rotation of the active friction plate 20, at this time, the whole clutch device is in a connected state, that is, the engine 10 is engaged with the transmission case 40 at this time, the power of the engine 10 is transmitted to the transmission case 40, and the rotation of the crankshaft 11 of the engine 10 finally drives the rotation of the output shaft 41 of the transmission case 40.

As shown in fig. 2, when the clutch plate 30 is separated from the active friction plate 20 by the reverse thrust of the elastic biasing mechanism 60, the pressing contact between the clutch plate 30 and the active friction plate 20 is gradually released, and at this time, the temporary engagement between the clutch plate 30 and the active friction plate 20 is cut off, so that the whole clutch device is in a disconnected state, and the connection between the power of the engine 10 and the transmission case 40 is cut off; that is, the engine 10 is temporarily separated from the transmission case 40 at this time, and the power transmission between the engine 10 and the transmission case 40 is cut off.

Specifically, the elastic pressing mechanism 60 includes a release bearing 61 and a shaft force transmission mechanism 62 for pressing and moving the release bearing toward the clutch plate; the release bearing 61 is sleeved outside the output shaft 41 of the gearbox 40 in a freely advancing and retreating manner; wherein a piston rod 51 is mounted on the hydraulic driving device 50; one end of the shaft force transmission mechanism 62 is connected to the piston rod 51 of the hydraulic drive device 50, and the other end of the shaft force transmission mechanism 62 is connected to the release bearing 61, for transmitting the thrust of the hydraulic drive device 50 to the release bearing 61, so that the release bearing 61 moves along the output shaft 41 of the transmission case 40 and approaches the clutch plate 30, and thus the release bearing 61 contacts the clutch plate 30 and presses the clutch plate 30 to approach the active friction plate 20.

In the above embodiment, when the engagement of the whole clutch device is required, that is, the temporary engagement of the clutch plate 30 and the active friction plate 20 is to be realized, the piston rod 51 of the hydraulic drive device 50 is controlled to be directionally extended, the shaft force transmission mechanism 62 with one end connected to the piston rod 51 of the hydraulic drive device 50 moves along with the extension of the piston rod 51 of the hydraulic drive device 50, so that the other end of the shaft force transmission mechanism 62 pushes the release bearing 61 to approach the clutch plate 30, the release bearing 61 contacts the clutch plate 30 to press and push the clutch plate 30 to approach the active friction plate 20, and the engagement of the whole clutch device is realized; the axial force transmission mechanism 62 may be implemented as at least one connecting rod connected to each other, and the number and relative position of the connecting rods are not limited herein, and only two connecting rods located at two ends are respectively connected to the release bearing 61 and the piston rod 51 of the hydraulic driving device 50, so that the axial force generated by the piston rod 51 of the hydraulic driving device 50 can be transmitted to the release bearing 61.

Specifically, the elastic pushing mechanism 60 further includes a sleeve 63, and the sleeve 63 is freely sleeved on the outside of the output shaft 41 of the gearbox 40 in a forward and backward manner; wherein the release bearing 61 is mounted outside the sleeve 63.

Specifically, as shown in fig. 4, the shaft force transmission mechanism 62 includes a rocker arm 621, a rotating shaft 623 and a separating fork 622, the rocker arm 621 and the separating fork 622 are respectively connected to the rotating shaft 623, one end of the rocker arm 621, which is far away from the rotating shaft 623, is connected to the output shaft of the hydraulic driving device 50, and one end of the separating fork 622, which is far away from the rotating shaft 623, is connected to the separating bearing 61. The rocker arm 621, the rotating shaft 623 and the separation fork 622 in the shaft force transmission mechanism 62 may be detachably connected, or may be rigidly connected to form a whole. The rotating shaft 623 is rotatably mounted on the body of the tractor, the whole shaft force transmission mechanism 62 plays a lever-like role, and the rotating shaft 623 is used as a central point of a lever.

It should be noted that the release bearing 61 and the sleeve 63 are integrally formed as a whole; compared with the split bearing 61 and the sleeve 63 which are matched and spliced, the integral forming is firmer.

Specifically, as shown in fig. 3, the elastic pressing mechanism 60 further includes: an elastic lever member 64, the elastic lever member 64 having a fulcrum 641 swingably supported on the clutch plate 30, a force point 642 at which linear movement from the release bearing 61 is input, and an action point 643 at which the linear movement is output to the clutch plate 30.

The automatic clutch device further comprises a connecting arm 32, one end of the connecting arm 32 is rotatably arranged on the clutch plate 30, and the other end of the connecting arm 32 faces the release bearing 61 and can be in pressing contact with the release bearing 61; wherein the fulcrum 641 of the elastic lever member 64 is fixedly supported on the connecting arm 32; and a side 6421 of the resilient lever member 64 on which the force point 642 is located is fixed to the connecting arm 32; and a side 6421 of the resilient lever member 64 on which the force point 642 is located is fixed to the connecting arm 32; a side 6431 of the resilient lever member 64 on which the operating point 643 is located protrudes out of the connecting arm 32, and a portion 6431 of the resilient lever member 64 on which the operating point 643 is located protrudes out of the connecting arm 32 faces the clutch plate, and is in pressing contact with the clutch plate 30.

In the above embodiment, the connecting arm 32 is provided, and the fulcrum of the elastic lever member 64 is fixedly supported on the connecting arm 32; and the side 6421 of the elastic lever member 64 where the force point 642 is located is fixed on the connecting arm 32 (the side 6421 of the elastic lever member 64 where the force point 642 is located receives the extrusion force from the release bearing 61), that is, the extrusion force from the release bearing 61 is transferred from the original elastic lever member 64 to the connecting arm 32, so that the two ends of the elastic lever member 64 are prevented from being stressed for a long time, and the service life of the elastic lever member 64 is shortened.

In the above-described embodiment, the shape of the elastic lever member 64 is not particularly limited, and it may be implemented as a spring, the elastic lever member 64 may also be implemented as a torsion spring, in this embodiment the elastic lever member 64 is implemented as a torsion spring, the middle portion of the torsion spring-like elastic lever member 64 is fixed to the connecting arm 32, since the connecting arm 32 is rotatably mounted on the clutch plate 30, the middle portion of the torsion spring-like resilient lever member 64 is also actually implemented to be swingably supported on the clutch plate 30, and a side 6431 of the torsion spring-like elastic lever member 64 on which the operating point 643 is located, that is, an end portion of the side that contacts the clutch plate 30, faces the clutch plate 30, and may be brought into pressing contact with the clutch plate 30 under certain circumstances; a specific analysis is now made as to the state when the elastic lever member 64 is implemented as a torsion spring:

for example, when the entire clutch device is in the engaged state, the piston rod 51 of the hydraulic drive device 50 is in the retracted state, that is, the hydraulic thrust provided by the hydraulic drive device 50 disappears, and no external thrust pushing action is applied, the shaft force transmission mechanism 62 will not press the sleeve 63, the release bearing 61 on the sleeve 63 will not press the connecting arm 32 at this time, and the elastic lever member 64 is in the first state, and the side 6431 of the acting point 643 of the elastic lever member 64 will press the clutch plate 30, so that the driven friction plate 31 on the clutch plate 30 and the driving friction plate 20 are in mutual pressing contact, so as to achieve the engagement of the entire clutch device;

as shown in fig. 2, when it is required to switch the whole clutch device to the off state, the piston rod 51 of the hydraulic drive device 50 is controlled to extend leftward to push the rocker arm 621 of the shaft force transmission mechanism 62 to advance leftward, and the shaft force transmission mechanism 62 as a whole pushes the release fork 622 of the shaft force transmission mechanism 62 leftward, the sleeve 63 is pushed leftward by the release fork 622, the release bearing 61 of the sleeve 63 is pushed leftward by the sleeve 63, so that the connecting arm 32 is passively rotated by the pressing and pushing of the release bearing 61, the connecting arm 32 is rotated, the side 6421 of the force point 642 of the elastic lever member 64 fixed to the connecting arm 32 is rotated by the connecting arm 32, and the side 6431 of the action point 643 of the elastic lever member 64 is away from the clutch plate 30, at this time, the elastic lever member 64 is in the second state, so that the pressing of the clutch plate 30 by the side 6431 of the elastic lever member 64 on which the operating point 643 is located is released in the front clutch engagement state, and the mutual pressing contact between the driven friction plate 31 and the driving friction plate 20 on the clutch plate 30 is released, that is, the entire clutch is in the off state.

When the whole clutch device needs to be switched to the engaged state again, the piston rod 51 of the hydraulic driving device 50 only needs to be controlled to be in the retracted state, that is, the hydraulic thrust provided by the hydraulic driving device 50 disappears, and at this time, the elastic lever member 64 rebounds from the second state to the first state due to the elastic potential energy accumulated by the elastic lever member 64 being squeezed in the previous disconnected state; i.e. the engagement of the entire clutch device is achieved.

In the embodiments described above, "leftward advancement" is based on the orientation or positional relationship shown in the drawings, which is merely for convenience of describing the invention and for simplifying the description, and does not indicate or imply that the referred devices or elements must have a configuration and operation in a specific orientation.

Specifically, one end of the swing arm 621 and one end of the separation fork 622 are connected to two ends of the rotation shaft 623, respectively.

Specifically, the automatic clutch device further includes a housing 70, and the housing 70 covers the active friction plate 20 and the clutch plate 30; the housing 70 protects the active friction plate 20 and the clutch plate 30 from disturbance in the working environment.

Specifically, the automatic clutch device further includes a central controller, and the central controller controls the piston rod 51 of the hydraulic driving device 50 to extend or retract, so as to control the clutch plate 30 to push toward or move away from the active friction plate 20. The central controller receives an external instruction, wherein the instruction can be an operation instruction sent by a driver or a manipulation instruction automatically judged and made by the central controller according to the form condition of the tractor; the tractor can be a manually driven tractor or a fully automatic unmanned tractor.

Specifically, how the central controller controls the piston rod 51 of the hydraulic driving device 50 to extend or retract is described in detail below, and the automatic clutch device further includes a pressure sensor, where the pressure sensor is used to collect hydraulic oil pressure information in the hydraulic driving device 50. The central controller is in communication connection with the pressure sensor, and controls the pressure of hydraulic oil in the hydraulic driving device 50, so as to control the extension or retraction of the piston rod 51 of the hydraulic driving device 50.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (14)

1. An automatic clutch device of a tractor, comprising:

an engine having a crankshaft mounted thereon;

an active friction plate mounted on an axial end portion of the crankshaft of the engine;

the gearbox is provided with an output shaft;

the clutch plate is movably sleeved at the output end of the output shaft of the gearbox in a free advancing and retreating manner, and the clutch plate and the driving friction plate are axially arranged oppositely;

the elastic pushing mechanism is used for pushing the clutch plate to be away from the active friction plate axially, so that the clutch plate is disconnected from the active friction plate; and

the hydraulic driving device is used for driving the elastic pushing mechanism to move, so that the elastic pushing mechanism is squeezed and pushes the clutch plate to be axially away from the active friction plate, and the clutch plate is disconnected from the active friction plate; when the hydraulic thrust of the hydraulic driving device disappears, the reverse thrust generated by the elastic pushing mechanism pushes the clutch plate to axially approach and squeeze the driving friction plate, and the temporary joint of the clutch plate and the driving friction plate is realized.

2. The automatic clutch device for a tractor according to claim 1, wherein the elastic urging mechanism includes a release bearing and a force transmitting mechanism for pressure-moving the release bearing toward the clutch plate; the release bearing is sleeved outside the output shaft of the gearbox in a freely advancing and retreating manner;

wherein the hydraulic driving device is provided with a piston rod;

one end of the shaft force transmission mechanism is connected to the piston rod of the hydraulic driving device, the other end of the shaft force transmission mechanism is connected to the release bearing, and the shaft force transmission mechanism is used for transmitting the thrust of the hydraulic driving device to the release bearing, so that the release bearing moves along the output shaft of the gearbox and is close to the clutch plate, and the release bearing is in contact with the clutch plate and is squeezed to push the clutch plate to be close to the driving friction plate.

3. The automatic clutch device for a tractor according to claim 2, wherein the elastic pressing mechanism further includes a sleeve, and the sleeve is freely fitted around the output shaft of the transmission case; wherein the release bearing is mounted outside the sleeve;

the other end of the shaft force transmission mechanism is connected to the sleeve.

4. The automatic clutch device of a tractor according to claim 3, wherein the release bearing is integrally formed with the sleeve as a single piece.

5. The automatic clutch device of a tractor according to claim 2, wherein the elastic pressing mechanism further includes an elastic lever member having a fulcrum swingably supported on the clutch plate, a point of force at which linear movement from the release bearing is input, and a point of action that outputs the linear movement to the clutch plate.

6. The automatic clutch device for a tractor according to claim 5, further comprising a connecting arm rotatably mounted at one end thereof to the clutch plate and rotatable at the other end thereof toward the release bearing to be brought into pressing contact with the release bearing; wherein the fulcrum of the resilient lever member is fixedly supported on the connecting arm; and one side of the elastic lever component where the force point is located is fixed on the connecting arm and rotates along with the rotation of the connecting arm; the side of the action point of the elastic lever component extends out of the connecting arm, and the part of the side of the action point of the elastic lever component extending out of the connecting arm faces the clutch plate and can rotate to be in pressing contact with the clutch plate.

7. The automatic clutch device of a tractor according to claim 2, wherein the axial force transmitting mechanism includes a rocker arm, a rotating shaft and a separating fork, the rocker arm and the separating fork are connected to the rotating shaft, respectively, one end of the rocker arm away from the rotating shaft is connected to the output shaft of the hydraulic driving device, one end of the separating fork away from the rotating shaft is connected to the separating bearing, and the rotating shaft is rotatably installed on a tractor body.

8. The automatic clutch apparatus of a tractor according to claim 7, wherein one end of the swing arm and one end of the release fork are connected to both ends of the rotating shaft, respectively.

9. The automatic clutch device for a tractor according to claim 1, wherein a driven friction plate engaged with the driving friction plate is provided on a surface of the clutch plate facing the driving friction plate;

when the hydraulic thrust of the hydraulic driving device disappears, the reverse thrust generated by the elastic pushing mechanism pushes the driven friction plate on the clutch plate to axially approach and squeeze the driving friction plate, so that the temporary joint of the driven friction plate and the driving friction plate is realized.

10. The automatic clutch device of a tractor according to claim 9, wherein the surfaces of the driving friction plate and the driven friction plate that contact each other are rough and uneven in cooperation.

11. The automatic clutch device of a tractor according to claim 1, further comprising a housing that houses the driving friction plate and the clutch plate.

12. The automatic clutch device for a tractor according to claim 2, further comprising a central controller, wherein the piston rod of the hydraulic drive device is controllably connected to the central controller to allow the central controller to control the piston rod of the hydraulic drive device to extend or retract to drive the clutch plates toward or away from the active friction plates.

13. The automatic clutch device for a tractor according to claim 12, further comprising a pressure sensor for collecting hydraulic oil pressure information in the hydraulic driving device.

14. The automatic clutch device for a tractor according to claim 13, wherein the central controller is in communication with the pressure sensor, the central controller controlling hydraulic oil pressure in the hydraulic drive device and thereby the extension or retraction of the piston rod of the hydraulic drive device.

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