JPH0221032A - Clutch device - Google Patents

Abstract

PURPOSE:To prevent a clutch from slipping under medium loads, by pivotally mounting a pressing lever on a clutch body or on a rotor, and putting this pressing lever in a turning movement by means of a shifter so that its plate and disk are pressed. CONSTITUTION:A pressing lever 36 is pivotally mounted on a clutch body 24 or on a rotor 26. A shifter 21 puts this pressing lever 36 into a turning movement so that its plate 25 and disk 27 are pressed. Pressing force for the plate 25 and the disk 27 may be greater in this case by a lever-effect than in the case of directly pressing them by means of a shifter 21. A clutch can thus be prevented from slipping under medium loads.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clutch device used in a power transmission system of a traveling vehicle, and particularly to a clutch device incorporated in a gear selection type transmission.

(Prior art) For example, in a front wheel power take-off section of a four-wheel drive tractor, a first gear transmitting power at the same speed as the rear wheel power and a second gear transmitting power at twice the speed are arranged on the rotating shaft. A device has been developed in which the first gear and the second gear are selectively engaged by sliding a spline-fitted chic on the rotating shaft.

The second gear rotates the front wheels at a higher circumferential speed than the rear wheels when the tractor makes a small-diameter turn at a certain steering angle or more. is provided with a wet type clutch, and the shifter is configured to press a plate of this clutch to interlock and connect the second gear and the rotating shaft.

(Problem to be solved by the invention) However, the shifter is a shift fork that slides linearly on the rotating shaft, and the pressing force of the chic is applied directly to the plate on a one-to-one basis. Since it is not very large, even if a moderate load is applied to the front wheels, the clutch may slip and the front wheel torque may decrease.

The present invention provides a clutch device in which a clutch is provided with a pressing lever for pressing a plate, and this pressing lever is rotated by a shifter, so that the plate can be pressed more forcefully by the lever action of the pressing lever. The purpose is to

(Means for Solving the Problems) Specific means for solving the problems in the present invention include a clutch body 24 having a power transmission gear 19 loosely fitted to the rotating shaft 14, and a clutch body 24 that is included in the clutch body 24 and A rotating body 26 that rotates integrally with the rotating shaft 14 , a plate 25 and a disk 27 that are supported by the clutch body 24 and the rotating body 26 so as to be slidable in the axial direction, and overlap each other in the axial direction, and the rotating shaft 14 A shifter 21 is provided to be integrally rotatable and slidable in the axial direction, and the plate 25 is pivotally supported by either the clutch body 24 or the rotating body 26 and is rotated by the shifter 21 sliding toward the rotating body 26. and a pressing lever 36 for pressing the disk 27.

(Function) In order to change the front wheel high-speed drive state from the four-wheel drive state in which the shifter 21 is engaged with the first gear 17 or the front wheel idle state in which it is in the neutral position, the shifter 21 is slid toward the rotating body 26 side. As it moves forward, it comes into contact with the force point 36b side of the pressing lever 36, and by rotating the pressing lever 36 around the pivot 35, the acting part 36a is pressed against the plate 25 and the disc 27, bringing them into close contact and closing the clutch. The body 24 and the rotating body 26 are integrally connected, and the power of the first gear 17 is transmitted to the rotating shaft 14. The pressing lever 36 is pushed into the shifter 21 by lever action.
Plate 25 and disk 2 with a force greater than the force pushing .
Press 7.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIG. 4, l is a tractor, which has two axles and four wheels, and has a front wheel 2 and a rear wheel 3, which also serve as steering wheels.
is controlled by a handle device 4.

Reference numeral 5 represents an engine, and 6 represents a vehicle body. A travel system transmission and a PTO system transmission are built into the vehicle body 6, and the travel system transmission drives the rear wheels 3.

Reference numeral 7 denotes a front wheel propulsion shaft, and the vehicle body 6 drives the front wheels 2 via a power take-off device 8 provided in the lower abdomen and a transmission shaft 10 in an axle case 9 containing a front wheel differential mechanism.

Referring to FIGS. 1 and 2, power takeoff device 8 is illustrated. Reference numeral 11 denotes a rear wheel drive shaft that is part of the driving system transmission, and drives the rear wheels via a differential mechanism (not shown).

12 is an intermediate axis that becomes part of the PTO system mission,
Interlocking gear 12 meshing with gear 11^ on rear wheel drive shaft 11
A is fitted onto the sleeve via a needle bearing 128 or the like.

Reference numeral 13 denotes a power extraction case, which is provided in the lower abdomen of the vehicle body 6.

14 is a power take-off shaft (rotating shaft), and power take-off case 1
3 via a bearing 15, and a low speed gear (first gear) 17 that constitutes a low speed transmission gear system 16 and a high speed gear (second gear) 19 that constitutes a high speed transmission gear system 18 are separated from each other by an interval. It is fitted in a mantle so that it can rotate freely (freely rotate).

The low speed gear 17 has an interlocking part 17A having an internal tooth structure, and the high speed gear 19 is provided with a clutch notch 20 between it and the power take-off shaft 14.

Reference numeral 28 denotes an interlocking gear shaft, which includes a low-speed gear 29 that engages with the interlocking gear 12A, and a high-speed gear 30 that is coaxially mounted with the gear 29. The gear 29 and the gear 17 engage, and the gear 17 has a large diameter. The gear 30 and the gear 19 mesh with each other, and the gear 19 has a small diameter to constitute the high speed transmission gear 18.

Here, the low-speed transmission gear system 16 has a gear ratio that drives the rear wheels 3 and the front wheels 2 in synchronization (same speed), and the high-speed transmission gear system 18 has a gear ratio that rotates the front wheels 2 at twice the speed of the rear wheels 3. It is said that

21 is chic and can be operated from the driver's seat 23 using an operating lever 22 shown in FIG.

The shifter 21 is fitted onto the power take-off shaft 14 between the low-speed gear 17 and the clutch 20 via a spline cylinder shaft 32 so as to be freely slidable in the axial direction.

This shifter 21 is an occluded part 2 that can be freely engaged and detached from the occlusal part 178.
1A and a pressing portion 21B.

The clutch 20 includes a clutch body 24 integrated with the high-speed gear 19, a plate 25, a rotating body 26 spline-fitted to the power take-off shaft 14, a disc 27 on the rotating body 26, and the like, and includes lubricating oil in the power take-off case 13. There is an oil bath.

The plate 25 and the disk 27 overlap in the axial direction, and are supported by the clutch body 24 and the rotating body 26 so as to be slidable in the axial direction and rotatable together.

A plurality of notches 33 are formed at equal intervals in the circumferential direction on the inner circumference of the rotating body 26, and a bracket 34 is provided on the high speed gear 19 side corresponding to the notches 33. A pressing lever 36 is supported in ten sections via a pivot 35.

The pressing lever 36 has an action portion 36a that projects radially outward from the pivot 35, and a force point portion 36b that extends approximately along the power take-off shaft 14.
It has The force point part 36b has an inclined surface 36c at the tip, and by moving the shifter 21 toward the clutch 20 in the direction of arrow A), the pressing part 21B is moved to the force point part 3.
6b is pressed radially inward. Further, the acting portion 36a has a rounded tip and can come into contact with the plate 25 or the disk 27, and when the pressing lever 36 is rotated by pressing the force point portion 36b, the plate 25 and the disk 27 are moved toward the stopper 37. Press.

The neutral state of free rotation of the front wheel is when the shifter 21 is not engaged with the occlusal part 17A and is not in contact with the force point part 36b, or even if it is in contact, the action part 36a is not pressing the plate 25 and the disc 27. The state in which it slides in the direction B in FIG. When the motor rotates and the clutch 20 is turned on, the high-speed gear 19 is connected to the power take-off shaft 14, resulting in a front-wheel double-speed four-wheel drive state.

FIG. 3 shows a modification of the pressing lever 36. The pressing lever 36° has its tip as a fulcrum, is supported by a pivot 35 provided on the clutch body 24, and has a midway portion that presses the plate 25 and disc 27. portion 36a, and its free end serves as a force point portion 36b that comes into contact with the pressing portion 21B of the shifter 21.

The pressing lever 36' of this modification can also press the plate 25 and the disk 27 in the same way as the pressing lever 36 of the previous embodiment, and the notch 33 is not required, making assembly easy.

Note that the clutch device is not limited to the embodiments and modifications, and can be modified in various ways.

For example, the low speed gear 17 and the shifter 21 are integrally molded to be slidable, and the position where the gear 29 engages and the press lever 36 are
It can be moved freely to the operating position, and not only the power take-off device 8 but also the traveling system and
It can also be applied to an O-type transmission.

At the rear of the tractor 1 is a three-point link mechanism 4 for attaching a work machine.
0 is provided, and the lift arm 42 and lower link 43 of the hydraulic device 41 are connected by a lift rod 44.

FIG. 5 shows one example of the lift rod 44.

This lift rod 44 has a gear case 46 pin-connected to an upper connecting body 45 that is pin-connected to the lift arm 42.
A pair of bevel gears 4748 are incorporated into the gear case 46, and the bevel gear 47 is attached to the handle 49.
The bevel gear 48 is integrated with the output shaft 50.

The output shaft 50 is short, and the upper end of a threaded cylinder 51 is screwed together and fixed with a roll pin 52, and a threaded rod 53 is screwed into the lower part of the threaded cylinder 51. A lower connecting body 54 that is pin-connected to the lower link 43 is welded to the lower end of the threaded rod 53. Furthermore, a bellows cover 55 made of resin and surrounding the thread of the threaded rod 53 is fitted between the lower part of the threaded cylinder 51 and the lower end of the threaded rod 53. 56 is a bearing with a seal on one side.

The threaded cylinder 51 of the lift rod 44 is rotated by turning the handle 49, and the threaded rod 53 is expanded and contracted to adjust the length between the upper and lower connecting bodies 45 and 54.

Compared to conventional lift rods whose length can be adjusted, this lift rod 44 has a shorter output shaft 50, and the threaded cylinder 51 and threaded rod 53 used in turnbuckles can be used as they are, reducing costs. It is planned. In addition, since the upper end of the threaded cylinder 51 comes into contact with the gear case 46, the push-up from below is restricted, so the handle 4
The rotation of 9 is always light. Furthermore, a bellows cover 55
This prevents dirt and mud from adhering to the screws, and also prevents rusting due to water intrusion.

(Effects of the Invention) According to the present invention described in detail above, the pressing lever 36 is pivotally supported on one of the clutch body 24 or the rotating body 26, and the pressing lever 36 is rotated by the shifter 21 to move the plate 25 and the disc. Since the shifter 27 is configured to press the plate 25 and the disk 27, the pressing force is larger due to the lever action than when the shifter 21 directly presses the plate 25 and the disk 27, and slipping of the clutch due to medium and low loads can be prevented.

[Brief explanation of the drawing]

Fig. 1.2 shows an embodiment of the present invention, Fig. 1 is an overall sectional view, Fig. 2 is a sectional view of the main part, Fig. 3 is a sectional view of the main part showing a modification of the pressing lever, FIG. 4 is a side view of a tractor to which the present invention is applicable, and FIG. 5 is a sectional view showing an example of a lift rond. 14-Power take-off shaft (rotating shaft), 17--Low speed gear (
1st gear"), 19-high speed gear (2nd gear), 20.
-Clutch, 21--Shifter, 24--Clutch body, 25--Plate, 26--Rotating body, 27-Disc, 35--Pivot, 36--Press lever, 36a
- Action part, 36b - Point of force part. Patent applicant Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] (1) A clutch body 24 having a power transmission gear 19 loosely fitted to the rotating shaft 14, a rotating body 26 included in the clutch body 24 and rotating integrally with the rotating shaft 14,
A plate 25 and a disk 27 are supported by the clutch body 24 and the rotating body 26 so as to be slidable in the axial direction, and are overlapped with each other in the axial direction, and are provided on the rotating shaft 14 so as to be integrally rotatable and slidable in the axial direction. a press lever 36 that is pivotally supported on either the clutch body 24 or the rotating body 26 and rotates as the shifter 21 slides toward the rotating body 26 to press the plate 25 and the disk 27.
A clutch device comprising: