JP2537434Y2 - Anti-twisting structure for wet clutch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a wet clutch used in a traveling working machine such as a tractor from turning around.

[0002]

2. Description of the Related Art Conventionally, when an engine driving force is input to a transmission of a tractor or the like and transmitted to a traveling drive system, an input-side free rotating drum and an output-side integrally rotating boss are mounted on a clutch shaft. In many cases, a wet multi-plate clutch is used, in which desks that alternately overlap each other are mounted on the boss side and the boss side, and both desk surfaces are pressed against or separated from each other in oil to perform the on / off operation of the clutch. The conventional wet multi-plate clutch is in an oil bath even when not in use unless oil in the transmission is extracted because of the need for oil lubrication.

[0003]

However, since the conventional wet multi-plate clutch is in an oil bath state when not in use, the clutch pedal is depressed at the start of use to operate the clutch in the "disengaged" position. However, there is a danger that the clutch will be in the `` on '' state due to the viscosity of the internal oil, etc., causing abnormal start, especially when the oil viscosity is high, such as in cold climates or in the early morning, etc. strong.

[0004]

According to the present invention for solving the above-mentioned problems, the clutch shaft 2 is supported on a partition wall 3 for partitioning the conventional transmission 1 and the clutch housing 7 so as to communicate with each other. In a structure in which a clutch 2 having a wet multi-plate structure is mounted on a shaft 2 in a clutch housing 7, a first means is necessary for the clutch housing 7 to operate the clutch 6 in conjunction with driving the engine when the clutch 6 is operated. An oil supply portion 27 for supplying a suitable oil, a large-diameter overflow hole 28 for allowing oil having an oil level (O · L ₁ ) or more necessary for clutch operation to overflow toward the transmission 1 in the clutch housing 7. The oil in the housing 7 is opened below the overflow hole 28 so that the oil in the housing 7 does not cause the clutch 6 to rotate. L ₂₎ are characterized by comprising a small diameter of the drain hole 29 for discharging the transmission 1 side so as to reduce to the second means, the engine drive upon actuation of the clutch 6 to the clutch housing 7 An oil supply unit 27 that supplies oil necessary for operating the clutch in conjunction with the oil supply unit 27 that operates for a fixed time in conjunction with the operation of turning off the engine and discharges the oil in the clutch housing 7 to an oil level that does not cause clutch rotation. And a pump 32 provided.

[0005]

According to the present invention, an oil supply section 27 is provided at the upper part of the clutch housing 7 for returning the oil necessary for the operation of the clutch and the lubrication of the transmission in conjunction with the driving of the engine. since 28 is provided, since the flow overflow the oil supplied from the oil supply unit 27 into the transmission 1, keep the oil level O · L ₁ during engine operation in a high position.
Further, a drain hole 29 is provided at a position below the overflow hole 28. When the oil supply is stopped by stopping the engine, the oil in the clutch housing is discharged into the transmission by the drain hole 29, and the clutch 6 is rotated. It is held low for the oil level O · L ₂ not to cause.

In the case of the second invention, the pump 32
As a result, the oil in the clutch housing 7 is operated for a certain period of time in conjunction with the engine turning-off operation to discharge the oil in the clutch housing 7 to an oil level at which the clutch does not turn.

[0007]

FIG. 1 shows a first embodiment of the present invention. A transmission gear 4 for speed change and the like is mounted on a clutch shaft 2 supported by a transmission 1 through a partition wall 3 in the transmission 1. A wet multi-plate clutch 6 is mounted on the outer protruding portion 2a. 5 is a differential gear for driving the vehicle.

[0008] A clutch housing 7 is provided outside the partition wall 3.
The input gear 8 is rotatably supported at the base end of the protruding portion 2a in a free rotation state, and the input gear 8 has a dish-like shape that is opened outward. The outer circumferences of a plurality of donut-shaped desks 11 are fixed at equal intervals in the drum 9 so that the clutch shaft 2 in the drum 9 rotates integrally with the clutch shaft 2. A boss 12 is spline-fitted, and a donut-shaped desk 13 is provided around the boss 12 so as to alternately overlap the desk 11 in the horizontal direction.
Is fixed to the inner circumference. 14a and 14b are pressing plates attached to both inner and outer end surfaces of the boss 12, and the outer pressing plate 14b is fixed to the boss 12 side.

A short shaft 17 is fitted slidably in the axial direction coaxially with the clutch shaft 2 on a boss 16 protruding from the inner center of the housing 7 side, and a bearing 18 is provided on the end surface side of the short shaft 17. An operation desk 19 is provided so as to be rotatably in contact therewith. The operation desk 19 is connected by a bolt 21 penetrating the boss 12 and
The inner pressing plate 14a is always pressed against the bearing 18 by the spring 22
Thus, the clutch 11 always acts in the direction of pressing the desks 11 and 13 to keep the clutch engaged. As a result, the clutch is disengaged by depressing a clutch pedal (not shown) and pushing the operation desk 19 back toward the transmission 1 against the spring 22.

Reference numeral 23 denotes a gear for driving the oil pump, which meshes with a drive gear 26 at the tip of an input shaft 24 on the engine side and the input gear 8.

An oil supply section 27 for returning oil necessary for clutch operation and lubrication of the transmission is provided in an upper portion of the clutch housing 7 in conjunction with driving of the engine, and is provided at a position on the clutch shaft center of the partition wall 3. Is a relatively large overflow hole 2 through which the oil supplied from the oil supply unit 27 overflows into the transmission 1.
8 is provided, the oil level O · L ₁ during engine operation by the overflow hole 28 is kept in high position as shown in FIG.

On the other hand, a relatively small-diameter drain hole 29 is provided near the lower end of the clutch 6 on the partition wall 3, and when the oil supply is stopped by stopping the engine, the oil in the clutch housing 7 is drained by the drain hole 29. It is discharged into the transmission 1, and holds the oil level O · L ₂ of low not to cause entanglement around the clutch 6.
In order to accurately maintain such an oil level maintaining function, for example, a bearing 10 or the like of the partition wall 3 for supporting the clutch shaft 2 uses a seal bearing that prevents oil flow on both sides, or an oil seal or the like. It is desirable to use a shielding structure.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, both the drive gear 26 and the oil pump drive gear 23 are directly engaged with the clutch input gear 8, and the overflow hole is formed in the partition wall 3. No oil or drain hole is provided, and only the bearing at a position higher than the clutch shaft bearing 10 of the partition wall 3 has an oil flow structure, and the oil level O · L ₁ during operation
In addition to the above-described structure that allows oil to flow between the transmission 1 and the clutch housing 7 only, a drain pipe 31 for discharging oil when the engine is stopped is connected to the vicinity of the bottom of the clutch housing 7.
The difference from the case of FIG. 1 is that the drain pipe 31 is provided with a pump 32 which is operated by a timer for a certain period of time necessary for draining oil from the housing 7 after the engine switch is turned off. Reference numeral 33 denotes a circuit for operating a timer after the engine is turned off.

[0014] Thus, in this embodiment, during engine operation because a large amount of oil is supplied by the oil supply unit 27, the oil level O · L ₁ is held at a high position than the clutch shaft 2 of the transmission 1, beyond which The oil flows over the transmission 1 via a bearing or the like at a position higher than the clutch shaft bearing 10.

[0015]

According to the anti-rotation structure of the present invention constructed as described above, during transmission operation of the transmission, a level of oil necessary for clutch lubrication is supplied from the oil supply unit into the clutch housing. Oil that exceeds this flows out to the transmission side, so lubrication is also ensured.On the contrary, when the engine is stopped without operating the clutch, the drain hole is kept until the oil in the clutch housing falls below the level that does not cause the clutch to rotate. Alternatively, the oil is discharged outside the clutch housing, such as in the transmission, by an oil discharge pump. As a result, the clutch is lowered to an oil level at which the input side and the output side do not rotate due to oil at the next start, and there is an effect that danger such as abnormal start or operation at the start is prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a transmission of a clutch housing mounting portion showing a first embodiment of the present invention.

FIG. 2 is a transmission sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission 2 Clutch shaft 3 Partition wall 6 Clutch 7 Clutch housing 27 Oil supply part 28 Overflow hole 29 Drain hole 31 Drain pipe 32 Pump

Claims (2)

(57) [Scope of request for utility model registration] A clutch shaft (2) is supported on a partition wall (3) for partitioning a transmission (1) and a clutch housing (7) so as to communicate with each other, and the clutch shaft (2) has a clutch housing (7). In the structure in which the clutch (6) of the wet multi-plate structure is mounted inside, the clutch housing (7) supplies the oil necessary for operating the clutch in conjunction with the driving of the engine when the clutch (6) is operated. A supply section (27) is provided, and a large-diameter overflow hole (28) for allowing oil having an oil level (O · L ₁ ) or more necessary for clutch operation to overflow toward the transmission (1) in the clutch housing (7). ) and, reduced to該越flow hole (28) than does an open oil in the housing 7 to the lower resulting entanglement around the clutch (6) oil level (O · L ₂₎ Corotation prevention structure of the wet clutch formed by providing a small diameter of the drain hole (29) for discharging the transmission (1) side so as to. 2. A clutch shaft (2) is rotatably supported on a partition wall (3) for partitioning the transmission 1 and the clutch housing 7 so as to communicate with each other. In a structure in which a clutch (6) having a plate structure is mounted, an oil supply unit (27) that supplies oil necessary for clutch operation in conjunction with engine driving when the clutch (6) is operated is provided in the clutch housing 7. And a pump (32) that operates for a certain period of time in conjunction with the engine turning-off operation and discharges oil in the clutch housing (7) to an oil level that does not cause the clutch to rotate. Prevention structure.