JPH084339Y2 - Tractor clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an oil supply device in a main clutch device part for connecting and disconnecting power transmission of engine rotation to a transmission case in a tractor or the like.

(B) Prior art In a conventional main clutch device of a tractor, an opening is provided on a side surface of a clutch housing or a clutch release sleeve and a sleeve guide are provided to lubricate between the clutch release sleeve and the sleeve guide. The technique of injecting grease between them is known.

For example, it is as disclosed in Japanese Utility Model Laid-Open No. 55-2791, Japanese Utility Model Laid-Open No. 55-37766 and Japanese Utility Model Laid-Open No. 55-32245.

(C) Problems to be Solved by the Invention However, in the conventional technology, lubrication of the grease between the clutch release sleeve and the sleeve guide is
This is a troublesome work because it is necessary to replenish the oil inside the clutch housing using a grease pump.

In particular, since the clutch release sleeve and the sleeve guide are located at the center of the clutch housing, it is difficult to communicate the oil supply hole from the outside of the clutch housing.

The present invention makes it possible to inject oil into the gap between the clutch release sleeve and the sleeve guide inside by injecting from the outside of the clutch housing with a grease pump.

(D) Means for Solving the Problem The purpose of the present invention is as described above, and a configuration for achieving the purpose will be described below.

The clutch release portion of the clutch device C disposed inside the clutch housing H of the tractor, and the sleeve guide 6 fixed to the outer circumference of the traveling clutch shaft 5, and the clutch which is slidably slidably fitted on the outer circumference of the sleeve guide 6. A release sleeve 1, a release roller shaft 7 for sliding the clutch release sleeve 1 back and forth, and a release roller shaft 7
Is composed of a clutch yoke 2 that rotates back and forth, and a clutch release shaft 3 that rotates by fixing the base of the clutch yoke 2. The clutch relays shaft 3 forms the clutch housing H in a state orthogonal to the traveling direction. An oil supply hole N is provided at a portion where the clutch release shaft 3 projects through from the clutch housing H, and the oil supply hole N is provided to an oil passage 3a in the clutch release shaft 3 and an oil passage 2a in the clutch yoke 2. , Oil passage in release roller shaft 7
7b communicates with the oil passage 1a of the clutch release sleeve 1,
It is configured to lubricate between the clutch release sleeve 1 and the sleeve guide 6.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a side sectional view of a main clutch device of a tractor of the present invention, FIG. 2 is an enlarged side sectional view of a portion of a clutch release sleeve 1 and a release bearing 8, and FIG. 3 is a rear sectional view of FIG. is there.

In the embodiment of the present invention, a clutch housing portion of a tractor equipped with an independent PTO device is illustrated.

A flywheel 13 is provided at a portion where the rear end of the engine crankshaft projects into the clutch housing H, and the tip of the PTO drive shaft 4 is engaged and supported at the center position of the flywheel 13 via a spline body 30. There is.

Therefore, the PTO drive shaft 4 always rotates during the rotation of the engine regardless of the rotation of the traveling clutch shaft 5.

A PTO clutch device (not shown) is independently provided in a portion where the rear end of the PTO drive shaft 4 reaches the rear end of the mission case.

 The rotation of the PTO shaft is connected and disconnected at this portion.

Also, on the outer periphery of the spline body 30,
The traveling clutch device C is arranged so as to wrap around 30.

The rotation of the flywheel 13 is disconnected from the traveling clutch shaft 5 depending on whether the traveling clutch device C is integrated with the flywheel 13 or separated therefrom.

A lever plate is used to connect and disconnect the traveling clutch device C.
When the release bearing 8 is pressed forward by depressing the lever plate 11 with the clutch pedal, the friction plate portion of the traveling clutch device C is separated and the traveling clutch device C is disengaged.

When the depression of the clutch pedal is released, the clutch release sleeve 1 and the release bearing 8 are retracted, the lever plate 11 is returned, and the traveling clutch device C is brought into the contact state.

The traveling clutch device C is for connecting and disconnecting the flywheel 13 and the traveling clutch shaft 5.

 Next, a description will be given with reference to FIGS.

The PTO drive shaft 4 is supported by a spline body 30 having a front end fixed to the flywheel 13, and a rear end supported by a needle bearing inside the traveling clutch shaft 5 supported by a bearing 31 of the clutch housing H. .

The traveling clutch shaft 5 is spline-engaged with the friction plate of the traveling clutch device C at the front end, and is in a cantilevered supporting state, but the rear part is supported by the bearing 31 of the clutch housing H and the further rear bearing. .

A sleeve guide 6 fixed to the clutch housing H is projected on the outer periphery of the traveling clutch shaft 5.
The clutch release sleeve 1 on the outer periphery of the sleeve guide 6 is loosely fitted.

When the release bearing 8 rotates together with the lever plate 11, the clutch release sleeve 1 further rotates together with the release bearing 8 and rotates.

Further, the clutch release sleeve 1 needs to slide back and forth around the sleeve guide 6 in order to press the release bearing 8, and in order to smoothly perform both rotation and slide, the clutch release sleeve 1 and the sleeve guide It is necessary to provide a sufficient amount of grease between 6 and 6.

If the lubrication is not sufficiently performed, it becomes impossible to rotate between the clutch release sleeve 1 and the sleeve guide 6,
If a large load is applied to the release bearing 8 and the depression force of the clutch pedal is not increased, the clutch release sleeve 1 will not move forward or backward. The release sleeve 1 does not retreat back to its original position, making it difficult to obtain the clutch engagement state.

The release bearing 8 has a ball 8c loosely fitted between an outer race 8b and an inner race 8a, and a front end of the release bearing 8 and the outer race 8b is formed as a contact portion for pressing the release lever plate 11.

The tip abutting portion with the outer race 8b is configured in an annular line contact state, and the outer race 8b is always released by the release lever plate 11 even when the clutch pedal is released and the traveling clutch is disengaged. It is in contact with the rear surface of.

Therefore, by rotating the release lever 11, the outer race
There is a possibility that 8b and 8b will rotate, and this will result in misaligned rotation with a non-constant rotation axis.

If this misalignment rotation is always continuous, the durability of the release bearing 8 is lost.

In passenger cars and the like, since the internal PTO drive shaft 4 is not provided, the diameter of the traveling clutch shaft 5 is small, and the diameter of the release bearing 8 is also small. It absorbs the misalignment rotation that occurs between.

However, in the case of a tractor, since the PTO drive shaft 4 is inside, the release bearing 8 becomes large and a self-aligning bearing cannot be used.

In the structure of the present invention, a disc spring 9 is interposed between the inner diameter of the release bearing 8 and the outer race 8b and the front end of the inner race 8a, and the disc spring 9 is retained by the stop ring 10. Is there.

By interposing the disc spring 9 at the front end of the inner race 8a and the inner diameter of the outer race 8b, the release bearing 8 can be preloaded in a state of being floated from the outer periphery of the clutch release sleeve 1. Even if the center position of the rotation of the release bearing 8 is deviated through the misalignment rotation between the 11 and the outer race 8b, the release bearing 8 can move the center position following this movement. It is possible to maintain the durability of the release bearing 8 and hold it in a reliable position.

Next, referring to FIG. 3, the clutch release sleeve 1
A lubrication system between the sleeve guide 6 and the sleeve guide 6 will be described.

Conventionally, to this portion, the lid of the clutch housing H was opened and grease was applied by a grease pump, or a grease was applied by connecting a pipe from an oil supply hole N provided outside the clutch housing H.

However, since these structures are complicated, in the present invention, an oil passage is provided which penetrates the clutch release shaft 3, the clutch yoke 2, and the release roller 7a.

The clutch release shaft 3 is fixedly provided with a clutch arm 32 which is interlocked with a clutch pedal, and is rotated by depressing the clutch pedal.

An oil supply hole N is provided at a portion of the clutch release shaft 3 protruding from the clutch housing H, and an oil passage 3a communicating from the oil supply hole N is extended to a portion where the clutch yoke 2 is fixed. The passage 2a communicates with the oil passage 7b in the release roller shaft 7 through the release roller 7a.

The release roller shaft 7 is pressed by an urging spring 33, and the urging spring 33 contacts the release roller 7a portion of the release roller shaft 7 with the oil passage 1a penetrating the outer periphery of the clutch release sleeve 1. Grease is inherited from the oil passage 7b to the oil passage 1a of the clutch release sleeve 1 and enters between the clutch release sleeve 1 and the sleeve guide 6.

(F) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

First, it is not necessary to remove the lid of the clutch housing H or to provide a pipe from the oil supply hole on the outside of the clutch housing H to the inner diameter portion of the clutch release sleeve as in the prior art, so that the clutch release sleeve can be easily used. It is possible to apply grease between 1 and the sleeve guide 6.

Secondly, since the oil passage is provided inside the clutch release shaft 3 itself and the oil supply hole N is provided in the portion where the clutch release shaft 3 projects from the clutch housing H, the oil supply hole is provided in the clutch housing H itself. It is no longer necessary to install a lid or a lid.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main clutch device of a tractor of the present invention, FIG. 2 is an enlarged side sectional view of a portion of a clutch release sleeve 1 and a release bearing 8, and FIG. 3 is a rear sectional view of FIG. is there. H ... Clutch housing N ... Oil supply hole 1 ... Clutch release sleeve 2 ... Clutch yoke 3 ... Clutch release shaft 7a ... Release roller

Claims (1)

[Scope of utility model registration request] 1. A sleeve guide 6 in which a clutch release portion of a clutch device C disposed inside a clutch housing H of a tractor is fixed to an outer periphery of a traveling clutch shaft 5.
A clutch release sleeve 1 slidably fitted around the outer circumference of the sleeve guide 6, a release roller shaft 7 for sliding the clutch release sleeve 1 back and forth, and a clutch yoke 2 for rotating the release roller shaft 7 back and forth. The clutch release shaft 3 is fixed to the base of the clutch yoke 2 and rotates. The clutch release shaft 3 supports the clutch housing H so as to penetrate through the clutch release shaft 3 in a state orthogonal to the traveling direction. An oil supply hole N is provided in a portion protruding from the clutch housing H, and the oil supply hole N is provided with an oil passage 3a in the clutch release shaft 3, an oil passage 2a in the clutch yoke 2, and an oil passage 7b in the release roller shaft 7. , Clutch release sleeve 1 oil passage
A clutch device for a tractor, which is communicated with 1a and is configured to lubricate between a clutch release sleeve 1 and a sleeve guide 6.