JPS5819935Y2 - Tractor clutch operating device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a clutch operating device for a tractor.

Conventionally, in tractors, a hydraulic clutch is provided in the drive system separately from the main clutch, and when shifting gears, only the hydraulic clutch is disengaged without disengaging the main clutch, and the gear shift operation of the drive system is performed while the PTO system continues to rotate. There is something like this.

but. Since the hydraulic control valve that controls the on/off of the hydraulic clutch is operated independently of the clutch pedal, there is a problem in that the operation is troublesome and cannot be performed quickly.

The purpose of this invention is to solve these problems, make the operation easier and faster, and extend the life of the clutch. In a tractor equipped with a hydraulic clutch provided in It is located at a point that is interlocked and connected so as to cut it.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

In FIG. 1, 1 is a vehicle, illustrating a tractor, and 2
1 is a tractor body, 3 is a front wheel, 4 is a rear wheel, 5 is an engine, and 6 is a clutch housing in which a main clutch is housed.

A clutch lever 8 is swingably supported on a shaft 7 that projects from the side wall surface of the clutch housing 6.

Reference numeral 9 denotes a step 9 protruding from the side wall surface of the tractor body 2 at approximately the center thereof.The step 9 is pivotably supported around a horizontal axis 10 at a position below the step 9, and is abutted against the front edge of the step 9. A freely accessible latch pedal 11 is attached, and a swing arm 12 and the clutch lever 8 are interlocked and connected by a rod 13.

Further, the swinging arm 12 and the brake 14 for the rear wheel 4 at the rear of the tractor 1 are connected by a brake rod 15.

Therefore, the tractor body 2 has the clutch housing 6
, a transmission case 16, a differential case 17, etc. constitute a part thereof, and a transmission mechanism consisting of a large number of gear groups is contained inside the transmission case 16.
Although not shown, this transmission mechanism further includes a hydraulic clutch.

A transmission stand 18 is attached to the upper surface of the transmission case 16 in a closed manner, and this transmission stand 18 has a built-in hydraulic pressure switching valve 19 that switches the pressure oil to the hydraulic clutch to control connection and disconnection. , rotary valves, etc. are used.

Reference numeral 20 denotes a swinging arm that is fixed to the spool of the valve 19 and operates the valve 19. The swinging arm 20 is connected to a part of the clutch pedal 11 by a connecting rod 21, and when the clutch pedal 11 is depressed, the swinging arm is operated. 20 is swung.

The connecting rod 21 is a spring cylinder 2 having a spring 22 inside.
3 is interposed, and when the swinging arm 20 comes into contact with the stopper 24 protruding from the transmission platform 18 at the position shown in FIG. 3, the spring 22 is compressed as shown in FIG. Clutch pedal 11 that is extended and operates the main clutch
only swings in the direction of arrow A.

To explain the operation of the double clutch device configured as above, as shown in Fig. 5, Fig. 2, Fig. 3, and Fig. 4, initially both the main clutch and the hydraulic clutch were turned on as shown in Fig. (connected state) and the brake 14 is not applied, when the clutch pedal 11 is depressed for a drive system gear shift, the swinging arm 20 swings until it hits the stopper 24, and the main clutch remains in the ON state. At this point, only the hydraulic clutch becomes 0FF (disconnected), and the speed of the driving system can be changed, so normally, the clutch pedal 11 can be returned to its original position as shown in FIG. 2.

Incidentally, the case where the brake 14 is applied in the state shown in FIG. 3 is shown in FIG. 5 and the like.

Next, in order to disengage the main clutch, it is sufficient to depress the clutch pedal 11 from FIG. 3 to FIG. 4.

In this state, both the main clutch and hydraulic clutch are 0F.
F (disconnected state), and the brake 14 is applied.

Therefore, it is possible to provide an independent pedal without connecting the brake rod 15 to the clutch pedal 11 if desired.

Although not shown in the above embodiment, independent left and right brake operation pedals are separately provided, and independent left and right brake operation is possible independently of the brake rod 15.

Incidentally, the connecting rod 21 is free to deform, and it is sufficient that there is relief after the two stoppers engage.

Furthermore, it is not limited to the middle part of the clutch pedal 11 itself, but can also be provided on the swinging arm 12.

In this invention, the hydraulic switching valve that controls the intermittent operation of the hydraulic clutch is placed on the clutch pedal for operating the main clutch, and the hydraulic clutch is disengaged first when the clutch pedal is depressed, so the clutch pedal is not used when shifting the driving system. Only the hydraulic clutch can be disengaged by pressing the pedal, and therefore, the clutch pedal for the main clutch can be used to control the engagement and engagement of the hydraulic clutch, which is easier to operate than in the past.

In addition, in the past, the main clutch was often disengaged using the clutch pedal even when changing gears in the driving system because operating the hydraulic pressure switching valve was cumbersome, but with the present invention, the hydraulic pressure is Since the clutch is disengaged, the main clutch is reduced to the minimum necessary when stopping the PTO system, etc., and durability is improved even if the main clutch is a dry type.

Furthermore, since the main clutch and the hydraulic clutch can be operated on and off with a single clutch pedal, it achieves the same function as a conventional two-stage double clutch; Although it is necessary to configure the propulsion shaft for the rear stage drive and PTO in the form of a double shaft, according to the present invention, the same function as a double clutch can be obtained using a single clutch, so such complicated This eliminates the need to adopt a unique shaft structure, and its practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing an embodiment of the present invention, FIGS. 2 to 4 are enlarged side views of main parts for explaining the function, and FIG. 5 is a garment for explaining the function. 11...Clutch pedal, 19...Hydraulic switching valve.

Claims (1)

[Scope of utility model registration request] In tractors equipped with a main clutch and a hydraulic clutch installed in the travel transmission system at a later stage, a hydraulic switching valve is provided to control the engagement and disconnection of the hydraulic clutch, and this hydraulic switching valve is connected to the clutch pedal for operating the main clutch. A clutch operating device for a tractor, characterized in that the hydraulic clutch is interlocked and connected so that it is disengaged first when the clutch pedal is depressed.