JPH0550157U - Clutch operating device - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention intends to automatically adjust the clutch operating device as the wear of the clutch disc decreases. [Structure] When the clutch disc wears and decreases, the pressure plate moves in the amount corresponding to the clutch disc pressing direction, and the release member pushes the release hub. Then, the connecting rod 38 is pushed rearward (on the right side in the selected drawing) via the release fork, the clutch lever, etc., and the swing arm 31 is pushed via the coil spring 39 to rotate upward around the pivot 30. Then, the engaged claw 32 and the engaging claw 29 are disengaged from each other, and the connecting rod 38, the swing arm 31, and the cylinder 27 move rearward with respect to the engaging rod 28 by the wear reduction of the clutch disc. After that, the engaged claw 32 again engages with the engaging claw 29, and the length of the link body 18 is adjusted. When the clutch pedal is stepped on, the engaging rod 28 is pushed forward through the Bowden wire, the relay link, etc., and the link body 18 moves forward while the engaging claw 29 and the engaged claw 32 are engaged. Then, the clutch is disconnected via the release hub.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clutch operating device used in a power transmission system of a tractor.

[0002]

[Prior Art]

 Generally, the clutch used in the tractor is a clutch disc that is spline-fitted to the input shaft of the power transmission system, a pressure plate that pushes this clutch disc against the flywheel, and a pressing force that applies to this pressure plate. And a release member that is interlocked with the pressure plate. On the other hand, the operating device for operating the clutch includes a clutch pedal, a release hub, and a transmission mechanism that transmits the depression force of the clutch pedal to the release hub.

When the clutch pedal is stepped on, the release hub is moved to the clutch side via the transmission mechanism, and the release hub is pressed by the release hub to separate the pressure plate from the clutch disc, so that the clutch disc moves from the flywheel. When separated, the transmission of motion from the engine to the transmission is cut off.

In this structure, when the facing of the clutch disc is worn down, the pressure plate moves toward the flywheel, and the release member contacts the release hub. Then, when the facing is further worn, the pressure plate does not move, the clutch starts slipping, and the clutch disc seizes. Therefore, conventionally, a turnbuckle is provided on the link of the transmission mechanism, and the length of the link is changed and adjusted by the turnbuckle.

[0005]

[Problems to be Solved by the Invention] In the conventional device, the turnbuckle is manually adjusted by the driver, which is troublesome and troublesome. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a clutch operating device that does not require adjustment as the clutch disc wear decreases.

[0006]

[Means for Solving the Problems]

 The technical means taken by the present invention to achieve the above-mentioned object is to move the release hub to the clutch side through the transmission mechanism by the depression operation of the clutch pedal, and the release hub is linked to the pressure plate by the release hub. To move the pressure plate in the direction away from the clutch disc against the spring force of the biasing spring that pushes the clutch disc against the flywheel via the pressure plate. In the clutch operating device, an adjustment that allows the transmission mechanism to move in a direction away from the clutch of the release hub by the wear reduction of the clutch disc when the release member presses the release hub due to the wear reduction of the clutch disc. The point is that the mechanism is interposed.

[0007]

[Action]

 When the clutch disc 3 wears down and the release member 7 presses the release hub 9, the adjusting mechanism 60 works to allow the release hub 9 to move away from the clutch 1 by the amount of wear reduction of the clutch disc 3. , The adjustment will be performed automatically.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 denotes a clutch for intermittently transmitting the engine rotational power to the transmission, which is used as a tractor. The clutch 1 connects the output shaft 4 and the input shaft 2 by clutching the clutch disc 3 spline-fitted to the transmission input shaft 2 and pressing the clutch disc 3 to the flywheel 5 fixed to the output shaft 4 of the engine. The pressure plate 6 and the diaphragm spring 7 (biasing spring) that applies a pressing force to the pressure plate 6 and is interlockingly connected to the pressure plate 6.

A release hub 9 having a release bearing 8 is fitted onto the input shaft 2 so as to be movable back and forth, and the release hub 9 is moved to the clutch 1 side and pressed against the diaphragm spring 7, The diaphragm spring 7 moves the pressure plate 6 away from the clutch disc 3 to shut off the engine power. Therefore, in the diaphragm type, the diaphragm spring 7 also serves as the release member. The clutch may be of the coil spring type in which the release member and the biasing spring are formed separately.

A clutch pedal 10 is provided in the steering section of the tractor. In this clutch pedal 10, a boss portion 11 provided at an upper end portion is supported by a pedal shaft 13 projecting laterally from a support plate 12 so as to be rotatable about its axis, and is suspended forward so that it can be stepped on. ing. One end of an inner wire 15 of a Bowden wire 14 is connected to the boss portion 11, and the other end of the inner wire 15 is connected to an upper part of a relay link 17 which is swingable around a lower support shaft 16. A rear end of the link body 18 is pivotally connected to a midway portion of the relay link 17, a front end of the link body 18 is pivotally connected to a clutch lever 19, and the clutch lever 19 is released via a lever shaft 20. It is connected to the fork 21.

The release fork 21 is engaged with the release hub 9, and when the clutch pedal 10 is stepped on, the inner wire 15 is pulled, the relay link 17 swings forward, and the link body 18 moves forward. The clutch lever 19 is pushed, whereby the lever shaft 20 rotates and the release fork 21 swings forward around the lever shaft 20 to push the release hub 9 toward the clutch 1. .. When the pedal effort is released from the clutch pedal 10, the clutch pedal 10 is returned to its original position by the clutch pedal return spring 22, and the release hub 9 is returned to its original position by the release hub return spring 23. The clutch lever 19, the link body 18, the relay link 17, etc. also return to their original positions. Then, the relay link 17 contacts the stopper 25, and the return position of the clutch pedal 10 and the like is determined. The Bowden wire 14, the link body 18, the intermediate link 17, the clutch lever 19, the release fork 21, and the like constitute a transmission mechanism 24.

As shown in FIG. 1, the link body 18 includes a tubular body 27 whose front and rear end openings are closed by lids 26a and 26b, and an engaging rod 28 is inserted into the tubular body 27 from the rear side. It is supported so that it can move forward and backward. The rear end of the engaging rod 28 is pivotally connected to the relay link 17, and a large number of engaging claws 29 are formed in the front-rear direction on the upper surface side of the engaging rod 28. A swing arm 31 whose front upper portion is swingably supported via a pivot 30 is accommodated in the cylindrical body 27, and the engaging rod 28 is provided on the rear lower surface side of the swing arm 31. An engaged claw 32 that engages with the engaging claw 29 is formed. In addition, a long engaging groove 34 in the front-rear direction with which the ball 33 engages is formed on the upper surface side between the engaged claw 32 of the swing arm 31 and the pivot 30, and a spring accommodating portion is provided above the ball 33. A compression coil spring 36 accommodated in 35 is provided, and the swing arm 31 is biased downward via the ball 33. Further, the lower front portion of the swing arm 31 is projected forward, and a spring accommodating hole 37 is formed in a recess from the front surface.

A connecting rod 38 is inserted from the front into the cylindrical body 27 and is supported so as to be movable back and forth. The front end side of the connecting rod 38 is pivotally connected to the clutch lever 19, the rear end side faces the front lower portion of the swing arm 31, and the spring accommodating hole 39 is recessed from the rear surface of the swing arm 31. A compression coil spring 40 is accommodated over the spring accommodating portion 37 and the spring accommodating hole 39 of the connecting rod 38. The engaging rod 28, the swing arm 31, the connecting rod 38 and the like constitute an adjusting mechanism 60.

In the above structure, when the forward force acts on the engaging rod 28 from the relay link 17 by stepping on the clutch pedal 10, the engaging claw 29 and the engaged claw 32 are engaged with each other. First, the swing arm 31 and the tubular body 27 move forward to contact the connecting rod 38, and then the clutch lever 19 is pushed via the connecting rod 38. When the pedaling force of the clutch pedal 10 is released, the operation reverses to the one described above to return. At this time, the release hub return spring 23 and the coil spring 40 are balanced with the connecting rod 38 and the swing arm 31 slightly separated from each other. Then, when the facing of the clutch disc 3 is worn down, the pressure plate 6 is pressed by the diaphragm spring 7, so that the pressure plate 6 moves in the direction of pressing the clutch disc 3 against the flywheel 5 and also the diaphragm. The spring 7 pushes the release hub 9 backwards by the wear reduction of the clutch disc 3. Then, the connecting rod 38 is pushed rearward through the release fork 21 and the clutch lever 19, the front lower portion of the swing arm 31 is pushed through the coil spring 40, and the rear portion of the swing arm 31 is rotated by the pivot shaft 30. Swings upwards against the spring force of the coil spring 36, the engaged claw 32 and the engaging claw 29 are disengaged, and the swing arm 31 moves toward the engaging rod 28 together with the tubular body 27. As a result, the clutch disc 3 is moved backward by the amount of wear reduction, and immediately thereafter, the engaged pawl 32 and the engaging pawl 29 are engaged with each other by the spring force of the coil spring 36. As a result, even if the clutch disc 3 wears down, the length of the link body 18 is automatically adjusted, and the clutch 1 does not slip and seizure is prevented.

In FIG. 3, reference numeral 41 denotes a hydraulic device for moving up and down a working machine mounted on the rear part of the tractor via a three-point link mechanism. On the side part of the hydraulic device 41, a front loader mounted on the tractor is provided. Alternatively, an auxiliary control valve 42 for supplying pressure oil to hydraulic equipment such as a backhoe is attached and fixed. Then, the pressure oil is taken out from the auxiliary control valve 42 to the external hydraulic device via the hydraulic pressure taking-out block 43 which is attached and fixed to the rear upper surface of the hydraulic device 41.

As shown in FIG. 4, the hydraulic pressure take-out block 43 has an A port 45 connected to the piston top side of the hydraulic cylinder 44, a B port 46 connected to the piston rod side, and an auxiliary control valve 42. The pump port 1 (49) connected to the C port 47 of the auxiliary control valve 42 via the pipe 48 and the pump port 2 (52) connected to the D port 50 of the auxiliary control valve 42 via the pipe 51 are formed. .. When pressure oil is supplied from the C port 47 of the auxiliary control valve 42 to the pump port 1 (49), the pressure oil pushes the check valve 57 against the force of the spring 58 and opens the valve seat 53. It is supplied to the piston top side of the hydraulic cylinder 44 from the A port 45 via the oil passages 54 and 55 and the circumferential groove 56. Further, when pressure oil is supplied from the D port 50 of the auxiliary control valve 42 to the pump port 2 (52), the pressure oil is supplied from the B port 46 to the piston rod side of the hydraulic cylinder 44, at this time The pilot pressure acts on the valve 59, the pilot valve 59 moves to the left side in the figure, pushes the protrusion 57a of the check valve 57 and pushes open the check valve 57, and Allow the oil to drain. Therefore, when the auxiliary control valve 42 is neutralized while the hydraulic cylinder 44 is extended, oil leakage on the piston top side of the hydraulic cylinder 44 is blocked by the check valve 57 of the hydraulic pressure take-out block 43, and the auxiliary control valve 42 is blocked. The internal leak of 42 can be prevented.

FIG. 5 shows a modified example of hydraulic pressure take-out, in which the hydraulic pressure take-out block 43 is directly attached to the auxiliary control valve 42.

[0018]

[Effect of the device]

 According to the present invention, even if the clutch disc wears down, the adjustment mechanism works, and the release hub is automatically moved and adjusted by the amount of the clutch disc wear reduction, and the clutch disc wears even if the clutch disc wears down. There is no need to make adjustments because it does not slip and burn.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part.

FIG. 2 is an overall schematic diagram.

FIG. 3 is an exploded perspective view showing an external hydraulic pressure take-out device.

FIG. 4 is a cross-sectional view of a hydraulic pressure take-out block.

FIG. 5 is an exploded perspective view showing a modified example of the external hydraulic pressure take-out device.

[Explanation of symbols]

 1 Clutch 3 Clutch Disc 5 Flywheel 6 Pressure Plate 7 Diaphragm Spring (Release Member) 9 Release Hub 10 Clutch Pedal 24 Transmission Mechanism 60 Adjustment Mechanism

Claims (1)

[Scope of utility model registration request] 1. A depressing operation of a clutch pedal moves a release hub to a clutch side via a transmission mechanism, and the release hub pushes a release member interlocked with the pressure plate, whereby the clutch is engaged via the pressure plate. In a clutch operating device configured to move the pressure plate in a direction away from the clutch disc against the spring force of a biasing spring that presses the disc against the flywheel, the transmission mechanism is configured to reduce wear of the clutch disc. A clutch operating device comprising an adjusting mechanism for allowing the release hub to move in a direction away from the clutch when the release member presses the release hub.