KR20220048247A - Clutch for tractor - Google Patents

Abstract

The present invention relates to a clutch apparatus for a tractor, comprising: a clutch pedal rotationally coupled to a vehicle body; and an automatic clutch cylinder connected by a cylinder rod rotationally coupled to the clutch pedal. According to the provided clutch apparatus for the tractor, the automatic clutch cylinder includes: a cylinder main body provided so that the cylinder rod enters and exits; and a valve block provided in the cylinder main body to allow a hydraulic pressure to and from the cylinder main body. An objective of the present invention is to provide the clutch apparatus for the tractor capable of accurately using a half-clutch.

Description

Clutch for tractor

The present invention relates to a clutch device for a tractor, and more particularly, to a clutch device for a tractor capable of mechanically automating the operation of a semi-clutch as well as manual or automatic clutch operation.

In general, a tractor is a work vehicle for agriculture, structurally similar to a general vehicle, but is equipped with a powerful engine compared to a general vehicle and has good traction and is strong, so it is mainly used for farming. Various types of working machines can be selectively attached to the front, rear, or both of the front and rear of the body body for use as a furnace.

As such, a tractor mainly used for cultivation is equipped with a transmission and a clutch for direction change and speed change. Shift is frequently required, and this shifting process is performed by a clutch.

Such a clutch includes a friction plate on a gear installed to rotate on a shaft, a pressure plate on a clutch housing that rotates integrally with the shaft, and connects or cuts off power by attaching or dropping the pressure plate to the friction plate.

The conventional clutch for a tractor is disclosed in Republic of Korea Utility Model Registration No. 20-0458060, which will be described with reference to the accompanying drawings.

As shown in FIG. 1, the conventional clutch for a tractor rotates up and down about the hinge 5 of the lower part of the vehicle body 3 according to the user's manipulation. ), the clutch rod 4 that is fastened to the lower end of the clutch pedal 2 to enable left and right movement according to the rotation of the clutch pedal 2, and the clutch rod 4 fastened to the tip of the clutch rod 4 A clutch release hub 6 to be moved in the opposite direction to the movement direction of (4), a pressure plate 7 fastened to the clutch release hub 6 to form a substantially disk-shaped plate to enable movement of the same width, and a pressure plate ( 7) is made of a clutch disk 8 to which the clutch shaft connected to the wheel is fastened while being in contact with the flywheel 9, which is connected to the output shaft of the engine to maintain a constant rotational force, while in contact with the flywheel 9, power is transmitted is meant to be

Accordingly, the flywheel 9 is rotated by the rotational force transmitted through the output shaft of the engine, and the flywheel 9 and the pressure plate 7 are joined at a predetermined pressure to the clutch disk 8 according to the rotation of the flywheel 9. When is rotated, the wheel is driven while the clutch shaft is rotated by the rotation of the clutch disk 8 .

In addition, when it is desired to block the transmission of the rotational force of the output shaft of the engine to the wheels, the driver selectively depresses the clutch pedal so that the clutch pedal 2 is rotated downward with the hinge 5 as the axis, and the clutch pedal 2 ), the clutch rod 4 fastened to the end is moved at a predetermined interval in the direction of the clutch disk 8 , and the clutch release hub 6 fastened to the clutch rod 4 moves in the opposite direction to the movement direction of the clutch rod 4 . The driving force of the engine so that the pressure plate 7 fastened to the front end is moved in the opposite direction to the movement direction of the clutch rod 4 while the clutch disk 8 is spaced apart from the flywheel 9 by a predetermined distance and transmitted to the wheels, etc. It is made up of a blocking structure.

However, in this conventional clutch for a tractor, in order to prevent the rattling of the tractor when starting again after stopping the tractor, the clutch pedal (2) is pressed without completely taking off the foot from the clutch pedal (2) while the tractor is running or working. A half-clutch is often used, and the half-clutch is inconvenient to use the half-clutch because the position at which the clutch pedal 2 is pressed is different for each worker, and this has a problem in that the tractor's engine is frequently turned off.

Republic of Korea Registered Utility Model No. 20-0458060

Accordingly, the present invention has been devised to solve the problems of the prior art as described above, and in addition to being able to operate the clutch manually or automatically, it is possible to mechanically automate the operation of the half-clutch to accurately use the half-clutch. An object of the present invention is to provide a clutch device for a tractor.

According to an aspect of the present invention, there is provided a clutch device for a tractor, comprising: a clutch pedal rotatably coupled to a vehicle body; An automatic clutch cylinder connected by a cylinder rod rotatably coupled to the clutch pedal; includes, wherein the automatic clutch cylinder includes: a cylinder body through which the cylinder rod enters and exits; It may include; a valve block provided in the cylinder body for supplying hydraulic pressure to and from the cylinder body.

In addition, the cylinder body may be provided with a piston moved by hydraulic pressure supplied through the valve block, and a return spring for returning the moved piston to its original position may be provided between the piston and the cylinder body.

In addition, the piston is provided between the cylinder rod and the valve block while being provided separately from the cylinder rod, and a return spring for returning the moved cylinder rod to its original position is provided between the cylinder rod and the cylinder body, and the piston is supplied to the valve block It is moved together with the cylinder rod by the hydraulic pressure, and the cylinder rod may be provided to move independently as the clutch pedal is depressed.

In addition, the piston is provided with a piston rod that enters and exits the inlet port formed in the valve block to protrude, and an inclined surface is formed on the circumferential surface of the piston rod to reduce the diameter, and when the moved piston returns, the hydraulic pressure between the piston rod and the inlet port It can be provided so that this flows finely.

In addition, the valve block is provided with a supply passage through which hydraulic pressure is supplied and discharged for the movement of the piston while communicating with the inlet port, and a return passage and bypass through which the hydraulic pressure supplied into the cylinder body through communication with the supply passage is reversed and discharged. Each flow path may be provided.

In addition, the return flow path of the valve block is provided with a flow control valve for controlling the opening of the return flow path. When hydraulic pressure is supplied to the supply flow path, the flow control valve closes the return flow path, and when the piston rod is introduced into the inlet port, the flow rate control valve is provided. The valve may be provided such that only a part of the return passage is opened so that the piston moves slowly.

In addition, the flow control valve may be provided by being screwed to the return flow path of the valve block, and may be provided with an operating lever fixed to the flow control valve to rotate the flow control valve to control the opening amount of the return flow path.

In addition, the bypass flow path of the valve block may be provided with a solenoid valve for opening and closing the bypass flow path, and the solenoid valve may be provided to open the bypass flow path when driving in 3 or more gears.

According to the clutch device for a tractor of the present invention, the clutch operation can be controlled manually or automatically, and the half-clutch operation is mechanically automated so that the half-clutch can be used accurately. It has the advantage of preventing the engine from shutting down and preventing sudden acceleration accidents.

1 is a schematic view showing a general tractor clutch.
2 is a front view of the clutch device for a tractor according to the present invention.
3 is a plan view of the clutch device for a tractor according to the present invention.
4 is a configuration diagram illustrating a connection relationship between a clutch pedal and an automatic clutch cylinder according to the present invention.
5 is a view of a state in which power is connected by an automatic clutch cylinder according to the present invention.
6 is a view of a state in which the power is cut off by the automatic clutch cylinder according to the present invention.
7 is a view of a semi-clutch state by the automatic clutch cylinder according to the present invention.
8 is a view of the half-clutch release state by the automatic clutch cylinder according to the present invention.
9 is a view of a state in which power is cut off by manual operation of the automatic clutch cylinder according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms used in the present invention are terms defined in consideration of the functions in the present invention, which may vary depending on the intention or custom of the user or operator, so the definitions of these terms correspond to the technical matters of the present invention and should be interpreted as a concept.

In addition, the embodiments of the present invention do not limit the scope of the present invention, but are merely exemplary matters of the components presented in the claims of the present invention, and are included in the technical spirit throughout the specification of the present invention and the scope of the claims. It is an embodiment including a substitutable component as an equivalent in the component.

In addition, optional terms in the examples below are used to distinguish one component from other components, and the components are not limited by the terms.

Accordingly, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

2 to 9 are views showing a clutch device for a tractor and an automatic clutch cylinder configured therein according to the present invention.

As shown in FIGS. 2 and 3, the clutch device for a tractor according to the present invention includes a clutch pedal 10 that is rotatably coupled to a vehicle body 1 of a driver's seat, and a lower end of the clutch pedal 10 rotatably. and an automatic clutch cylinder 100 connected by a coupled cylinder rod 160 .

The lower end of the clutch pedal 10 is provided with a hinge unit 11 rotatably coupled to the vehicle body 1 under the driver's seat, and the front end of the clutch pedal 10 is positioned at the driver's seat with the hinge unit 11 as an axis. It is provided to be rotated to the bottom surface and then reversely rotated to return to the original position.

The connecting arm 20 is coupled and fixed to the hinge part 11 of the clutch pedal 10 so as to rotate integrally, and the cylinder rod 160 of the automatic clutch cylinder 100 to be described later is provided at the end of the connecting arm 20 . connected and provided.

As a result, as the clutch pedal 10 rotates forward (downward rotation) or reverse rotation (upward rotation), the connecting arm 20 rotates together and pulls the cylinder rod 160 connected thereto to move forward (in front of the driver's seat) side) or push it to move it backwards (to the rear side of the driver's seat).

In addition, first and second limit switches 30 and 31 contacting the forward and reverse rotating clutch pedals 10 are provided on the vehicle body under the driver's seat, respectively, and the first limit switches 30 are provided on the vehicle body in front of the driver's seat The provided and fully lowered clutch pedal 10 is contacted by the tip to inform that the engine power is cut off (the clutch pedal 10 is positioned at the bottom dead center), and the second limit switch 31 is located on the driver's seat. It is provided on the rear vehicle body 1 and is contacted by the rear end of the fully raised clutch pedal 10 to inform that the power of the engine is connected (the clutch pedal 10 is located at top dead center).

In addition, in front of the cylinder rod 160 connected to the clutch pedal 10, a clutch master cylinder 40 interlocking with the cylinder rod 160 moving forward and backward is provided, and the clutch master cylinder 40 is a clutch opera cylinder. (not shown) is provided to be connected.

Accordingly, the clutch master cylinder 40 generates supply pressure to the clutch hydraulic oil by the descending force of the clutch pedal 10 and supplies it to the clutch opera cylinder. The supply pressure operates the clutch.

As shown in FIGS. 4 to 6 , the automatic clutch cylinder 100 is coupled and fixed to the rear end of the cylinder body 110 and the cylinder body 110 through which the cylinder rod 160 is provided and exits. and a valve block 120 for allowing hydraulic pressure to and from the cylinder body 110 .

The cylinder body 110 is a hollow tube with an empty interior, and a through hole through which a cylinder rod 160 to be described later enters and exits is formed on its front surface, and a valve block 120 is inserted and fixed to the rear surface thereof. It is formed so as to be open.

The valve block 120 has an inlet port 124 through which the cylinder rod 160 enters and exits is formed on its front surface, and a hydraulic pressure for movement of the piston 150, which will be described later, is supplied and discharged on the rear surface thereof. is formed to communicate with the entry port 124 .

In addition, the upper and lower sides of the supply passage 121 are provided in communication with the supply passage 121 , while the hydraulic pressure supplied to the cylinder body 110 through the supply passage 121 is reversed and discharged to the supply passage 121 . A return flow path 122 and a bypass flow path 123 are formed respectively.

The inlet port 124 of the valve block 120 is provided with a piston rod 151 of a piston 150 to be described later in and out, and the hydraulic pressure supplied through the supply passage 121 is supplied through the supply passage ( 121) by pushing the piston rod 151 forward to move the piston 150 forward, and when the piston 150 moves backward, the hydraulic pressure supplied to the cylinder body 110 is supplied to the valve through the supply passage 121 It is discharged to a hydraulic tank (not shown) outside the block 120 and recovered.

In addition, the return flow path 122 of the valve block 120 is provided with a flow rate control valve 130 for controlling the opening amount of the return flow path 122, that is, the opening width of the flow path. This flow control valve 130 blocks and closes the return flow path 122 when the hydraulic pressure is supplied to the supply flow path 121, and when the piston rod 151 is introduced into the inlet port 124 of the valve block 120 7 opens only a part of the return flow path 122 to perform a semi-clutch operation for slowly moving the piston 150 .

The flow control valve 130 is screwed to the return flow path 122 of the valve block 120 and provided with a ball 131 for directly opening and closing the return flow path 122 at its tip end, and the valve block 120 ) at the rear end of the flow control valve 130 protruding to the outside, an operation lever 132 for rotating the flow control valve 130 in a spiral direction is fixedly provided.

And, the upper end of the operation lever 132 is provided to be positioned as the driver's seat, so that the driver can directly mechanically operate the flow rate control valve 130 through the operation lever 132 . That is, as the operation lever 132 is pushed or pulled, the flow control valve 130 is rotated in a spiral direction within the return flow path 122 to move forward or backward, thereby closing or opening the return flow path 122. .

At this time, when the return passage 122 is partially opened by the flow control valve 130 , the flow rate of the hydraulic pressure discharged to the supply passage 121 is small, so that the piston 150 moves backward (that is, the clutch pedal 10 rises). ) is made slowly to perform a semi-clutch operation, and when the return flow path 122 is completely opened, the piston 150 and the clutch pedal 10 move rapidly.

In addition, the bypass flow path 123 of the valve block 120 is provided with a solenoid valve 140 for opening and closing the bypass flow path 123 . This solenoid valve 140 does not operate at low speed driving, that is, in the 1st and 2nd low gear stages, so as to block the bypass flow path 123 and close it. By opening the pass passage 123, the operation of the anti-clutch is released.

Here, the anti-clutch is mainly used for low-speed driving in which the vehicle is driven in 1st and 2nd gear, and since the anti-clutch is not used in high-speed driving in 3rd or higher gear, the solenoid valve ( 140) is set to work.

A ball 141 for directly opening and closing the bypass flow path 123 is provided at the front end of the solenoid valve 140 , and a spring for elastically supporting the ball 141 is provided between the ball 141 and the solenoid valve 140 . When the tractor is traveling at low speed, the ball 141 blocks and closes the bypass flow path 123 by the spring, and when the tractor is traveling at high speed, the solenoid valve 140 is operated to pull the ball 141, thereby causing the bypass flow path 123 ) will be opened.

As such, when the bypass flow path 123 is opened, a large amount of hydraulic pressure is directly discharged to the supply flow path 121 through the bypass flow path 123, so that the piston 150 and the clutch pedal 10 are quickly returned to their original positions. moved and returned

Meanwhile, in the cylinder body 110 in front of the valve block 120 as described above, as shown in FIGS. 4 to 6 , a piston 150 that is moved by hydraulic pressure supplied through the valve block 120 is provided. A return spring 155 for returning the moved piston 150 to its original position is interposed between the front surface of the piston 150 and the cylinder body 110 .

In addition, the piston rod 151 inserted into the supply passage 121 through the inlet port 124 of the valve block 120 on the rear surface of the piston 150 is formed to protrude, and the piston rod 151 is the supply passage In the state inserted in 121, it is moved together with the piston 150 and completely separated from the inlet port 124 of the valve block 120, and when the piston 150 moves in reverse, it passes through the inlet port 124 again. It is provided to be inserted into the supply passage (121).

At this time, the protrusion 152 having a larger diameter than that of the piston rod 151 is formed at the end of the piston rod 151, that is, the rear end, and the diameter, that is, the outer diameter, is formed at both ends of the protrusion 152 toward each end. Inclined surfaces 153 and 154 are formed to be gradually reduced.

And, the protrusion 152 between the both inclined surfaces 153 and 154 is formed with an outer diameter of 0.01 to 0.2 mm smaller than the inner diameter of the inlet port 124, and when the moved piston 150 returns, the piston rod ( 151) between the protrusion 152 and the inlet port 124 is provided to operate an orifice in which hydraulic pressure flows minutely.

Accordingly, in a state in which the piston rod 151 is completely inserted into the supply passage 121 of the valve block 120 as shown in FIG. 5 and the piston 150 is moved to the front of the valve block 120, the clutch pedal 10 is In the case where it is located at top dead center (power transmission state), and the piston rod 151 is completely removed from the inlet port 124 of the valve block 120, as shown in FIG. 6, the piston 150 is the valve block ( 120) in a state farthest apart from the front surface, and at this time, the clutch pedal 10 is positioned at the bottom dead center (power cut off state), and the protrusion 152 of the piston rod 151 is the valve as shown in FIG. 7 . In the state positioned at the entry port 124 of the block 120, the clutch pedal 10 is rotated at an angle of 45 degrees and becomes a semi-clutch state.

On the other hand, the rear end of the cylinder rod 160 is through-coupled to the cylinder body 110 in front of the piston 150 as described above, and the rear end of the cylinder rod 160 is separated from the piston 150 and provided in a state independent from each other. The front end of the cylinder rod 160 is provided to be connected to the hinge portion 162 rotatably coupled to the connection arm 20 provided in the clutch pedal 10 .

In addition, a return spring 161 for returning the moved cylinder rod 160 to its original position is provided between the cylinder rod 160 and the cylinder body 110 .

Therefore, when hydraulic pressure is supplied to the supply passage 121 of the valve block 120 , the piston 150 is automatically moved forward by the supplied hydraulic pressure and is moved together with the cylinder rod 160 , and the driver uses the clutch pedal 10 . As the clutch pedal 10 is manually lowered by the pedal effort, only the cylinder rod 160 connected to the clutch pedal 10 moves forward independently as shown in FIG. 9 .

On the other hand, as described above, the return springs 155 and 161 respectively provided on the piston 150 and the cylinder rod 160 have both ends of the inner surface of the cylinder body 110 and the front surface of the piston 150 or the cylinder, respectively. It is provided with a compression coil spring elastically supported in a state in contact with the rear end of the rod 160 .

Accordingly, a return force to always move toward the front side of the valve block 120 acts on the piston 150 and the cylinder rod 160 by the return springs 155 and 161 .

The operational relationship of the clutch device for a tractor according to the present invention as described above will be described.

This clutch device can be operated manually, can be operated automatically, and when automatically operated, half-clutch operation can also be implemented automatically.

[Clutch operation by manual operation]

The manual clutch operation is performed when the driver depresses the clutch pedal 10 from the driver's seat.

That is, when the clutch pedal 10 is depressed, the clutch pedal 10 is rotated downward as shown in FIG. 9 and is located at the bottom dead center in close contact with the bottom surface of the driver's seat, and the clutch pedal 10 located at the bottom dead center is the first The limit switch 30 is switched, and accordingly, the ECU recognizes that the engine power is cut off along with the position of the clutch pedal 10 .

On the other hand, when the clutch pedal 10 is rotated downward as described above, the clutch pedal 10 is rotated about the hinge part 11 of the lower end as an axis, and the connection arm 20 fixedly connected to the hinge part 11 is also a clutch. As the pedal 10 rotates in the same direction, the cylinder rod 160 coupled to the connecting arm 20 by the hinge part 162 is pulled forward to move forward.

In particular, the cylinder rod 160 moving forward is drawn out from the cylinder body 110 of the automatic clutch cylinder 100 while compressing the return spring 161 provided therein, and the piston 150 in the cylinder body 110 is in place. will keep

After that, when you take your foot off the clutch pedal 10 that you were stepping on, the return spring 161 compressed by the cylinder rod 160 returns to its original position, and the cylinder rod 160 is drawn back into the cylinder body 110, By the backward movement of the cylinder rod 160, the connecting arm 20 and the clutch pedal 10 connected thereto are rotated upwardly in the reverse direction and returned to their original positions.

When the clutch pedal is positioned at the original position, top dead center, the second limit switch is switched, and the power of the engine is reconnected.

[Clutch operation by automatic]

The automatic clutch operation is performed by the automatic clutch cylinder 100 .

That is, when the clutch operation button is operated from the driver's seat, hydraulic pressure of 16 bar is supplied to the supply passage 121 of the valve block 120 , and the piston rod 151 inserted into the supply passage 121 by this hydraulic pressure is moved forward. The piston 150 integrally formed with the piston rod 151 is also moved forward in the cylinder body 110 at the same time as being pushed to the .

Then, by the forward movement of the piston 150, the cylinder rod 160 in contact with the front surface of the piston 150 is moved forward along with the piston 150, thereby compressing each return spring 155, 161.

This forward movement of the piston 150 is made until the piston rod 151 completely exits the inlet port 124 of the valve block 120 as shown in FIG. 6 and is separated, and the front end of the piston 150 is a cylinder The movement is stopped by being in contact with the inner surface of the body 110 .

On the other hand, when the forward movement of the piston 150 is stopped, the clutch pedal 10 is positioned at the bottom dead center as when the clutch pedal 10 is depressed due to the forward movement of the cylinder rod 160, and the clutch The bottom dead center position of the pedal 10 is detected by the first limit switch 30 and output to the ECU. In this state, the engine power is blocked by the clutch.

Thereafter, when the clutch operation button is operated after shifting from the driver's seat, the supply force for supplying hydraulic pressure to the valve block 120 is removed, and at the same time, the compressed return springs 155 and 161 are returned to their original positions and the cylinder rod 160 ) is drawn back into the cylinder body 110 and at the same time the piston 150 is pushed toward the valve block 120 to move.

Then, by the backward movement of the cylinder rod 160, the connecting arm 20 and the clutch pedal 10 connected thereto are returned to their original positions while upwardly and rotated in the reverse direction, and the cylinder body 110 by the backward movement of the piston 150. The hydraulic pressure introduced into the inside flows into the inlet port 124 and is returned to the hydraulic tank (not shown) through the supply passage 121 .

During this operation, when the protrusion 152 of the piston rod 151 that moves backwards like the piston 150 is inserted into the inlet port 124 of the valve block 120, the inlet port 124 is blocked, but the inlet port 124 ) and the protrusion 152 and the inclined surfaces 153 and 154 of the protrusion 152 form a fine flow path, and the flow of hydraulic pressure discharged to the supply flow path 121 is rapidly reduced due to the orifice effect of the fine flow path. becomes slow, and at this time, the clutch pedal 10 slowly ascends at a very slow and minute speed from an angle before about 45 degrees.

At this time, when the tractor is traveling at a low speed, the driver operates the operation lever 132 in the driver's seat to completely move the flow rate control valve 130 provided in the return flow path 122 of the valve block 120 backward. As the flow path 122 is completely opened, most of the hydraulic pressure in the cylinder body 110 is discharged to the supply flow path 121 through the return flow path 122 and returned to the hydraulic tank.

Accordingly, the backward movement speed of the piston 150 and the cylinder rod 160 can be accelerated, and the clutch pedal 10 can be quickly raised to the original position to reconnect the power of the engine by the clutch.

At this time, the piston rod 151 is inserted into the supply passage 121 through the inlet port 124 of the valve block 120 as shown in FIG. 5 .

[ half clutch work]

The half-clutch operation can be operated during both manual and automatic clutch operation, but in this embodiment, the use of the half-clutch during automatic clutch operation will be described as an example.

First, during the above-described automatic clutch operation process, when the protrusion 152 of the piston rod 151 that moves backward like the piston 150 is inserted into the inlet port 124 of the valve block 120, the driver By manipulating the operation lever 132 to move the flow rate control valve 130 backward only by a certain distance within the return flow path 122, the flow path of the return flow path 122 is partially opened, that is, for example, only a flow path of 1/5 or less is opened. do.

Then, as shown in FIG. 7 , the hydraulic pressure in the cylinder body 110 slowly flows and is discharged to the supply flow path 121 through the return flow path 122 in which a flow path of 1/5 or less is opened by the flow rate control valve 130 .

In this process, as the flow of hydraulic pressure discharged through the supply passage 121 becomes slow, the clutch pedal 10 rises slowly at a slow speed. becomes

In addition, when the driver slightly puts his or her foot on the slowly rising clutch pedal 10 to block the clutch pedal 10 from rising, the anti-clutch state is maintained.

When the anti-clutch operation is performed at a low speed of the tractor, that is, only in the first and second lower gears, damage to the clutch and transmission can be prevented.

Accordingly, since the anti-clutch should not be used during high-speed driving of the tractor, that is, in a high-speed shift stage of 3 or more gears, the anti-clutch operation is forcibly released.

That is, when the gear is shifted to 3 or more gears, the ECU detects this and operates the solenoid valve 140 provided in the bypass flow path 123 of the valve block 120 .

Then, as the ball 141 blocking the bypass flow path 123 is pulled toward the solenoid valve 140 as shown in FIG. 8 , the bypass flow path 123 is opened, so that the hydraulic pressure inside the cylinder body 110 is mostly flow rate It is quickly discharged to the supply flow path 121 through the bypass flow path 123 secured with a wider diameter than the narrow return flow path 122 by the control valve 130 .

Accordingly, when the bypass flow path 123 is opened by the solenoid valve 140 , the anti-clutch operation is forcibly released.

Of course, the solenoid valve 140 does not operate in the 1st and 2nd low-speed shift stages, so the bypass flow path 123 is blocked and shut off, so that the anti-clutch operation is smoothly performed.

Although the present invention has been described in detail through specific examples, this is for the purpose of describing the present invention in detail, and the present invention is not limited thereto. It is clear that the modification or improvement is possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims.

1: body 10: clutch pedal
11: hinge part 20: connecting arm
30,31: limit switch 40: clutch master cylinder
100: automatic clutch cylinder 110: cylinder body
120: valve block 121: supply flow path
122: return euro 123: bypass euro
124: entry port 130: flow control valve
131: ball 132: operation lever
140: solenoid valve 141: ball
150: piston 151: piston rod
152: protrusion 153,154: inclined surface
155: return spring 160: cylinder rod
161: return spring 162: hinge part

Claims (8)

a clutch pedal rotatably coupled to the vehicle body;
An automatic clutch cylinder connected by a cylinder rod rotatably coupled to the clutch pedal;
The automatic clutch cylinder includes a cylinder body provided with a cylinder rod in and out;
A clutch device for a tractor comprising a; valve block provided in the cylinder body to allow hydraulic pressure to and from the cylinder body.
The method according to claim 1,
A clutch device for a tractor is provided with a piston moved by hydraulic pressure supplied through the valve block in the cylinder body, and a return spring for returning the moved piston to its original position between the piston and the cylinder body.
3. The method according to claim 2,
The piston is provided between the cylinder rod and the valve block while being separated from the cylinder rod, and a return spring for returning the moved cylinder rod to its original position is provided between the cylinder rod and the cylinder body, and the piston is hydraulic pressure supplied to the valve block A clutch device for a tractor that is moved together with the cylinder rod by the tractor, and the cylinder rod is provided to move independently as the clutch pedal is depressed.
3. The method according to claim 2,
The piston is provided with a piston rod that enters and exits the port formed in the valve block to protrude, and a notch or an inclination is formed on the circumferential surface of the piston rod so that the flow rate increases toward both ends, so that when the moved piston returns, the piston rod A clutch device for a tractor that allows the hydraulic pressure to flow minutely between the inlet and outlet ports.
5. The method of claim 4,
The valve block is provided with a supply flow path that communicates with the inlet port and supplies and discharges hydraulic pressure for movement of the piston. Clutch devices for tractors each provided.
6. The method of claim 5,
The return flow path of the valve block is equipped with a flow control valve that controls the opening of the return flow path. When hydraulic pressure is supplied to the supply flow path, the flow control valve closes the return flow path, and when the piston rod enters the inlet port, the flow control valve closes. A clutch device for a tractor that opens only a part of the return flow path so that the piston moves slowly.
7. The method of claim 6,
The flow control valve is screw-coupled to the return flow path of the valve block, and is coupled and fixed to the flow control valve to rotate the flow control valve to control the opening amount of the return flow path.
6. The method of claim 5,
A clutch device for a tractor is provided with a solenoid valve for opening and closing the bypass flow path in the bypass flow path of the valve block, and the solenoid valve is provided to open the bypass flow path when driving at a speed higher than a set speed.

Images