JPS6025008Y2 - Transmission device of work equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission device for a working machine incorporating a slip clutch.

Conventionally, a rotary power transmission device provided between mismatched devices has a slip clutch, and the slip clutch interrupts an overload generated in one device.

For example, a universal connecting shaft is provided between an agricultural tractor and a rotary tiller towed by the agricultural tractor, and the power of the PTO shaft of the tractor is transmitted to the gear transmission of the working implement via the connecting shaft.

Usually, a multi-disc slip clutch is provided at the universal joint of this universally connected shaft to cut off overload on the working machine side.

However, since this slip clutch is exposed to the outside, the friction coefficient changes due to dust, rain, etc. and the cut torque value is likely to fluctuate. Also, there is a risk that foreign objects may get caught and damage the friction plates, etc. The weight of the connecting shaft was heavy, making installation work difficult.

Therefore, the present invention was devised in view of the above-mentioned problems, and the purpose is to provide a power transmission device for a working machine that solves the above-mentioned problems by incorporating a slip clutch in the gear transmission device. shall be.

Therefore, the feature is that the working machine is removably attached to a tractor and power is transmitted from the shaft of the tractor to the input shaft of the gear transmission via a universally connected shaft. The main gear case rotatably supports an input shaft, a pinion shaft parallel to the input shaft, and an output shaft perpendicular to the pinion shaft. The opposite end protrudes outward from the main gear case, the protruding end is connected via the spur gear case, the pinion shaft and the output shaft are connected within the main gear case via a bevel gear, and the spur gear connecting portion One of the spur gears and its shaft are connected via a slip clutch whose transmission torque can be adjusted, and an auxiliary gear case that covers the connecting portion of these spur gears is detachably attached to the main gear case.

At the point. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

What is shown in FIG. 1 is a side-drive type rotary tiller 1 that is attached to be towed by an agricultural tractor (not shown).
Reference numeral 2 denotes a gear transmission provided approximately at the center of the gear transmission, 3 a rotary support, which is provided in pairs on both sides of the gear case 4 of the gear transmission 2, and 5 a side frame, which is provided at the outer end of the rotary support 3. There are a pair of left and right tillers, 6 is a tilling part, which is rotatably supported by the left and right side frames 5, and 7 is a tiller part.
is a side drive device, which is provided on the outside of one side of the side frame 5 to transmit power from the gear transmission 2 to the tilling section 6.

The gear transmission 2 includes an input shaft 8 that is mounted on a gear case 4 and protrudes from the case 4, a pinion shaft 9 that is mounted on the gear case 4 in parallel with the input shaft 8, and a pinion shaft 9 that is perpendicular to the pinion shaft 9. It has an output shaft 10 that protrudes from the gear case 4 and transmits power to the side drive device 7 through the inside of the rotary support 3. are connected and interlocked by a pair of bevel gears 12.

A flexible connecting shaft (not shown) is connected to the protrusion of the input shaft 8, and the power of the tractor is transmitted.

. The side drive device 7 has a transmission sprocket 13 provided at the outer end of the output shaft 10 and a claw shaft sprocket 15 provided at the outer end of the claw shaft 14 of the tiller 6, which are connected and interlocked by a check 716. .

As shown in FIG. 2, the spur gear 11 provided on the pinion shaft 9 is provided on the pinion shaft 9 via a slip clutch 17 that is provided integrally with the spur gear 11.

That is, the slip clutch 17 includes a plurality of clutch plates 18 that are fitted to a spline provided at the end of the pinion shaft 9 so as to be movable in the axial direction and rotate integrally with the pinion shaft 9, and a bearing 19 on the pinion shaft 9. A clutch body 20 provided relatively rotatably through the clutch body 20;
An annular friction plate 21 rotates integrally with the clutch plate 18 and is alternately arranged in parallel with the clutch plate 18 in the axial direction, and also rotates integrally with the clutch body 20 and, together with the clutch body 20, clamps the friction plate 21 and the clutch plate 18 from both sides in the axial direction. A presser plate 22;
This is a so-called multi-disk type slip clutch which is mainly composed of a torque adjusting device 23 that biases a clutch body 20 and a presser plate 22 from both ends in the axial direction.

The axial movement of the slip clutch 17 is achieved by the bearing 19 coming into contact with a large-diameter stepped portion 24 provided on the pinion shaft 9, and the snap ring 25 provided on the inner periphery of the clutch body 20 coming into contact with the bearing 19. , movement toward the shaft internal force is restricted, and the collar 26 fitted on the outer end of the pinion shaft 9 contacts the clutch plate 18 to restrict movement toward the outer end.

This collar 26 is restrained from moving in the axial direction by a nut 27 screwed onto the outer end of the pinion shaft 9 via a washer 28.

The nut 27 is a self-locking nut or a locking nut in which a part of the nut 27 is bent and locked to the pinion shaft 9.

The torque adjustment device 23 includes a bolt 29 that passes through each of the clutch body 20, friction plate 21, and presser plate 22 in the axial direction and is provided at a predetermined interval in the circumferential direction, and a presser plate for the bolt 29. The coil spring 30 is fitted onto a portion protruding toward the 22 side, and an adjustment nut 31 is screwed onto the bolt 29 to apply an axial biasing force to the spring 30.

Gear teeth are cut on the outer periphery of the clutch body 20 of the slip clutch 17 configured as described above.
A spur gear 11 is provided integrally with the gear 0.

In addition, 32 is a bearing case which supports the pinion shaft 9 on the gear case bulkhead 4', 33 is a wear-resistant member attached to both sides of the clutch plate 18 by sintering or the like, and 34 is a bearing case. The locking portion is a locking portion that is protruded from the end face of the clutch body 20 at a predetermined interval in the circumferential direction in order to rotate the friction plate 21 and the presser plate 22 integrally with the clutch body 20.

Reference numeral 36 denotes a sub gear case, which constitutes the gear case 4. The gear 11 is meshed with the sub gear case 35, and the sub gear case 35 is connected to the gear case partition wall 4.
It is removably attached to '.

According to the above embodiment of the present invention, since the spur gear 11 is provided on the clutch body 20, the input shaft 8 and the pinion shaft 9 are parallel to each other.
A slip clutch 17 can be incorporated in between, and therefore the slip clutch 17 can be installed in the gear transmission 2, preventing deterioration of clutch function due to lumps and foreign objects, and being constantly cooled with oil. Since the transmission torque value is stable and the temperature rise is small, wear of the friction plate 21 and the clutch plate 18 is prevented.

Furthermore, since there is no need to provide a slip clutch on the universally connected shaft as in the past, the connection work between the universally connected shaft and the input shaft 8 becomes easier. However, as in the present invention, the clutch body 20 is pivotally supported on the pinion shaft 9 via a bearing 19, which makes the clutch connection part unstable and causes vibration and noise. Since the spur gear 11 is provided on the clutch body 20, power can be transmitted smoothly without generating vibration or noise.

In addition, if a slip clutch is incorporated into the universal connection shaft, an appropriate torque value must be set for each working machine to be towed, but if it is incorporated in the tiller 1 side as in the above example, If there is, it will be used exclusively for that purpose, so only the initial adjustment is required.

Moreover, since the slip clutch 17 is incorporated into the gear transmission 2 provided approximately at the shaft of the tiller 1, the position of the center of gravity of the tiller 1 is not changed, and stable tilling can be achieved.

Furthermore, since the slip clutch 17 is provided in the detachable auxiliary gear case 35, the torque can be easily adjusted by removing the auxiliary gear case 35.

Note that the slip clutch 17 is not limited to being provided on the pinion shaft 9, but may be provided on the input shaft 10.

These gears are not limited to being integrally provided with the clutch body 20, but may be detachably fixed to the clutch body 20.

According to the present invention, it is no longer necessary to provide a slip clutch on the universal connection shaft between the input shaft of the work equipment and the PTO shaft of the tractor as in the past, which simplifies the connection work of the connection shaft and eliminates vibrations caused by the clutch. is reduced.

Further, according to the present invention, since the slip clutch is provided within the gear case, foreign objects are prevented from getting caught, and stable clutch function can be achieved.

Furthermore, the transmission torque of the slip clutch can be easily adjusted by removing the auxiliary gear case.

[Brief explanation of the drawing]

1. Figure 1 is a partial cross-sectional front view of a side-drive rotary tiller adopting the present invention, and Figure 2 is a partial cross-sectional front view of the side-drive rotary tiller that adopts the present invention.
■It is a line sectional view. 2... Gear transmission, 4... Gear case, Input shaft, 9... Zenion shaft (rotating shaft), 10... Output Shaft, 11...Spur gear (gear), 17...Slip clutch, 2
0...Clutch body.

Claims (1)

[Scope of utility model registration request] In a working machine that is detachably attached to a tractor and in which power is transmitted from a circular O-shaft of the tractor to an input shaft of a gear transmission via a universally connected shaft, a main gear case of the gear transmission includes an input shaft; A pinion shaft parallel to the input shaft and an output shaft perpendicular to the pinion shaft are rotatably supported,
The input shaft and the pinion shaft protrude outside from the main gear case at the end opposite to the power receiving side end of the input shaft, and the protruding end is connected via a flat gear, and the pinion shaft and the output shaft are arranged inside the main gear case. One of the spur gears of the spur gear connection portion and its shaft are connected via a slip clutch whose transmission torque can be adjusted, and a sub gear covering the spur gear connection portion is connected to the shaft through a bevel gear. A power transmission device for a working machine, characterized in that a gear case is detachably attached to a main gear case.