JPH06123317A - Operating structure of friction type multiple disc clutch - Google Patents

Abstract

PURPOSE:To prevent the coupling rotation of a multiple disc clutch with the simple structure. CONSTITUTION:A clutch-in condition that a drive side friction plate 22 coupled inside of a drive side drum 21 and a driven side friction plate 25 fitted out of a driven shaft 23 are made to pressure-contact with each other for transmission by a shift member 26, which is to be pushed for operation by a spring 27, and a clutch-off condition that the pushing of the shift member 26 by the spring 27 is cancelled by a shift fork 28, resisting the pushing force of the spring 27, can be switched freely by a friction type multiple disc clutch. The spring 27 is fitted out of the driven shaft 23, and the shift member 26 is spline- fitted out of the driven shaft 23, and under the clutch-off condition, the shift fork 28 and the shift member 26 receive sliding resistance by the pushing force of the spring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a spring to press a drive-side friction plate that is inwardly engaged with a drive-side drum and a driven-side friction plate that is externally engaged with a driven shaft. Operation of the friction-type multi-disc clutch that can be switched between a clutch engaged state in which the shift member is pressed into contact with the clutch for transmission and a clutch disengaged state in which the shift fork releases the shift member against the pressing force of the spring. Regarding the structure.

[0002]

2. Description of the Related Art In the conventional friction type multi-disc clutch operating structure, as shown in, for example, Japanese Unexamined Patent Publication No. 2-248727, a driven shaft is spline-fitted and a driven-side friction plate is engaged and linked. A holder and a pinching member slidably mounted thereto, a coil spring is arranged at an appropriate position in the circumferential direction to press the friction plate, and by operating the shift fork, the shift member is interposed. The pressing member is slid to cut off the transmission, and the extended portion from the shift member presses the friction member against the holder to prevent the driven shaft from rotating when the transmission is in the cut state. There was something I did.

[0003]

In the conventional structure described above, in the clutch of this type, the follow-up phenomenon on the driven side in the clutch disengaged state due to the viscosity of the lubricating oil existing between the friction plates and the like is surely ensured. It was designed to prevent it. However, in the above-mentioned conventional structure, a dedicated mechanism for preventing the friction member and the like from rotating together is required, and there is a drawback that the structure becomes complicated with a large number of parts, and there is room for improvement. The present invention aims to eliminate the above-mentioned problems.

[0004]

The features of the present invention are as follows:
The spring is externally fitted to the driven shaft, the shift member is splined to the driven shaft, and the shift fork and the shift member receive a sliding contact resistance by a spring pressing force in a clutch disengaged state. There is a point.

[0005]

[Function] The shift member is pressed by a spring externally fitted to the driven shaft, and the friction plates of the driving side and the driven side can be pressed into contact with each other to set the clutch engaged state. When the clutch is disengaged, the shift fork is operated. Then, the shift member can be slid against the spring force of the spring to release the pressure contact action of the friction plates, and the clutch can be set to the disengaged state. Since the shift fork is forced to perform the shift operation in the state that the driven shaft is engaged with the shift shaft, a sliding contact resistance acts between the shift fork in the fixed position and the shift member that rotates integrally with the driven shaft, so that the driven shaft moves. It will be possible to prevent the rotation.

[0006]

Therefore, by rationally constructing the disposition structure of the shift member and the press contact spring, which are indispensable for this type of multi-plate clutch, the shift fork and the shift member for the clutch disengagement operation are combined. Due to the sliding contact resistance, it is possible to prevent the follow-up of the driven shaft with a simple structure without providing a dedicated mechanism for preventing the follow-up.

[0007]

Embodiments will be described below with reference to the drawings. Figure 4
Shows the transmission structure of an agricultural tractor. Engine 1
Is supplied to the gear shift type main transmission 4 via the main clutch 2 and the cylinder shaft 3, and the power after shifting of the main transmission 4 is supplied to the rear wheel differential mechanism 6 via the sub transmission 5. The rear wheel transmission system is configured to be supplied and the auxiliary transmission 5
Between the front wheel drive shaft 7 and the front wheel drive shaft 7, a standard drive state in which the front wheels are driven at substantially the same peripheral speed as the rear wheels, and a front wheel acceleration state in which the peripheral speed of the front wheels is set higher than the peripheral speed of the rear wheels. A front wheel transmission system is configured by interposing a front wheel speed increasing device 8 that can be switched between and. Further, the transmission shaft 9 to which the power of the engine 1 is directly transmitted
Is fitted in the cylindrical shaft 3 so as to be relatively rotatable, and from the transmission shaft 9 to the friction type multi-plate clutch 10 and the transmission 1.
A power take-off transmission system is configured to transmit power to the rear power take-off shaft 12 and the central power take-off shaft 13 via 1.

In the front wheel speed increasing device 8, large and small drive gears 15 and 16 having different gear diameters are loosely fitted onto the driven shaft 14 of the auxiliary transmission device 5 which also serves as the input shaft of the rear wheel differential mechanism 6, and
The front wheel drive shaft 7 is provided with driven gears 17 and 18 which are always engaged with the drive gears 15 and 16 so as to be integrally rotatable, and when the small-diameter drive gear 15 is engaged and driven, the standard drive state is established, and the large-diameter drive gear 16 is The number of gear teeth is set so that the front wheels are accelerated when occlusally driven. The operation member 20 is slidable into a state in which the small-diameter drive gear 15 is rotatably engaged with the large-diameter drive gear 15 and a state in which the large-diameter drive gear 16 is frictionally transmitted to the large-diameter drive gear 16 via the friction clutch 19.
Is spline-fitted onto the driven shaft 14, and the small-diameter drive gear 15 is configured so that the operating member 20 biased to the articulated state can be artificially slid to switch to the front wheel speed-up state. .

As shown in FIG. 1, the friction-type multi-plate clutch 10 provided in the power take-off transmission system includes the transmission shaft 9 as shown in FIG.
A plurality of drive-side friction plates 22 are engaged with and linked to the inside of the drum 21 in which the boss portion is spline-fitted to the end of the drum 21.
A plurality of driven-side friction plates 25 are engaged with and linked to an engaging member 24 that is fitted in the driven shaft 23 inward of the spline, and the driving-side friction plates 22 and the driven-side friction plates 25 are alternately stacked. They are arranged in a combined state. And the driven shaft 23
A shift member 26 for pressing the friction plates 22 and 25 into contact with each other is spline-fitted outside. The shift member 26 is pressed in the friction plate pressure-contact direction by a coil spring 27 fitted onto the driven shaft 23 so that the clutch is engaged. It is configured to urge. The shift fork 28 that slides the shift member 26 against the spring force of the coil spring 27 is attached to the spindle 2
This shift fork 2 is slidably mounted on the
8 is configured to be slid by a rotating cam 30. The rotary cam 30 is formed by welding a small diameter round bar 30b to the outer peripheral surface of the rotary operation shaft 30a.
By rotating around the axis of the shift fork 28, a cam action is exerted by the mounting position of the round bar 30b, and as shown in FIG. 2, the bearing 31 supported on the boss of the shift fork 28 is pushed to operate the shift fork 28. Is configured to slide against the spring force of the coil spring 27 so that the clutch can be disengaged (see FIG. 3). At this time, the sliding contact resistance between the shift fork 28 in the position-fixed state and the shift member 26 rotatable integrally with the driven shaft 23 is caused by the viscosity of the lubricating oil in the clutch disengaged state of the friction multi-plate clutch 10. It is possible to prevent the rotation. A surface treatment may be applied to the sliding contact surface of the shift fork 28 on the clutch disengagement side so that the sliding contact resistance is increased.

It should be noted that reference numerals are added to the claims to facilitate the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

1 is a cutaway side view of a friction type multi-plate clutch.

FIG. 2 is a front view of a shift fork.

FIG. 3 is a cutaway side view of the friction multi-plate clutch.

[Fig. 4] Transmission system diagram of agricultural tractor

[Explanation of symbols]

 21 Drum 22 Drive Side Friction Plate 23 Driven Shaft 25 Driven Side Friction Plate 26 Shift Member 27 Spring 28 Shift Fork

Claims (1)

[Claims] 1. A drive-side friction plate (22) engaged with and linked to the inside of a drive-side drum (21) and a driven-side friction plate (25) externally engaged with a driven shaft (23). , A clutch-engaged state in which a shift member (26) pressed by a spring (27) transmits the pressure member in a pressure contact state, and the shift member (26)
Is a friction type multi-disc clutch operating structure in which the operation can be switched to a clutch disengaged state in which the pressing is released by the shift fork (28) against the pressing force of the spring (27). In the clutch disengaged state, the shift fork (28) and the shift member (26) are fitted to the driven shaft (23) and the shift member (26) is spline fitted to the driven shaft (23).
An operating structure of a friction type multi-disc clutch in which and are configured to receive sliding contact resistance by a spring pressing force.