JPS5950231A - Drag preventive device of wet type clutch - Google Patents

Abstract

PURPOSE:To improve drag preventive effect and minimize the clutch fitting time by making the gap between friction plates adjustable from the outside. CONSTITUTION:Besides a main hydraulic piston 7, an auxiliary hydraulic piston 10 is provided in an operating cylinder 8, and operating oil supply passages 11 and 12 which operate these pistons while pressing a return spring 9, are provided therein. A hydraulic changeover valve 15 which communicates or closes these passages, is also interposed therein. When the operating oil has a high temperature, the operating oil communicates with the operating oil supply passage 12 by the expansion. Hence, the auxiliary hydraulic piston 10 operates up to the position of a stopper 10A, and the main hydraulic piston 7 is also pushed out. Therefore, when a hydraulic changeover valve is operated, the operating oil supply passage 11 communicates with the hydraulic pump side, and main and auxiliary hydraulic pistons 7 and 10 operate together. Hence, the interval between the main piston 7 and the friction plate 6 becomes small. At the time when the operating oil has a low temperature, only the main piston operates and the interval between the main piston 7 and the friction plate 6 becomes great. Drag at the time when the operating oil has a low temperature, can be prevented and the clutch fitting time at the time when the operating oil has a low temperature, can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drag prevention device for a wet type clutch.

In conventional wet clutches, the gap between the friction plates is constant regardless of the temperature of the lubricating oil, and when the lubricating oil temperature is low, viscosity causes rotation, and even when the clutch is disengaged. The problem is that the clutch is in the same state as when it is connected, which is dangerous.If the gap between the friction plates is increased to prevent this slipping, the time lag becomes large, causing a delay in clutch engagement, or the hydraulic pump There were disadvantages such as the need to increase the capacity of the

Therefore, as a countermeasure to the above problem, the tip of a U-shaped bimetal is fixed between two ring plates installed on the back of the pressure plate that moves to engage and disengage the clutch, thereby making the pressure plate into an annular shape. In addition to the invention of Utility Model Publication No. 45-31949 concerning a drag stabilizing device for a wet multi-disc clutch that changes the back clearance, the invention of Utility Model Publication No. 48-44518 concerning a drag torque reducing device, Special Publication on Protection Devices 1986-32
The invention of No. 785 and the invention of Utility Model Publication No. 52-8902 regarding a device for preventing defective clutch plate separation have been made, but both have complicated structures, increase costs, or cannot control the gap between the friction plates from the outside. There was a problem.

In addition, a switching valve is provided in the lubricating oil supply passage to the wet clutch, which works in conjunction with the clutch operating lever to open the supply passage when the clutch is engaged and close the supply passage when the clutch is off, thereby supplying lubricating oil when the clutch is off. Japanese Utility Model Publication No. 57-19464 has proposed a device for preventing drag in a wet clutch that prevents drag by cutting off the supply of lubricating oil; however, simply cutting off the supply of lubricating oil has little effect on preventing drag. There is a drawback.

Therefore, the present invention solves the above-mentioned conventional drawbacks and problems, and
By making the gap between the friction plates adjustable from the outside, the purpose is to improve the effect of preventing drag and to minimize the time required to engage the clutch.

That is, the wet clutch drag prevention device of the present invention includes sub-hydraulic pistons that can operate in the same direction in the operating cylinder of the wet-clutch, and a hydraulic oil supply passage to each of these sub-hydraulic pistons to control the operation of the wet clutch. It is constructed by providing a hydraulic switching valve which allows communication between both hydraulic oil supply passages when the oil is at a high temperature, and which allows communication between only one of the hydraulic oil supply passages when the hydraulic oil is at a low temperature.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 of the present invention is a main part side sectional view of a wet clutch according to the first embodiment of the present invention, FIG. - A front sectional view in the I direction, FIG. 4 is a front sectional view in the II-II force direction of FIG. 2,
Figure 5 is a front cross-sectional view in the ■-■ direction of Figure 2, and Figure 6 is a cross-sectional view of Figure 2.
FIG. 2 is a side cross-sectional view of a main part of the temperature control valve shown in the figure when the hydraulic oil is at a low temperature.

First, a multi-plate wet clutch 6 interposed between an input shaft 1 and an output shaft 2 shown in FIG.
, a plurality of steel plates 5 provided on the clutch housing 4 side, a plurality of friction plates 6 provided on the output shaft 2 side, and the above-mentioned steel plates 1-5 arranged alternately.
The main hydraulic piston 7, which presses the friction plate 6 and the clutch fitting operation, is connected to the actuating cylinder 8 of the clutch housing 4.
The input shaft 1 is disposed within the input shaft 1 so as to be operable in the axial direction of the input shaft 1.

A return spring 9 is interposed between the input shaft 1 and the output shaft 2, and acts to turn off the clutch.

Furthermore, in the operating cylinder 8, in addition to the above-mentioned main hydraulic piston 7, there are hydraulic oil supply passages 11 and 12, respectively, for operating the spring 9 while pressing it in the same direction as the main hydraulic piston 7. Separate routes are provided within 1.

Therefore, lubricating oil is supplied as hydraulic oil to the hydraulic oil supply passages 11 and 12 by a hydraulic pump 14 from an oil pan 13 shown in FIG. A hydraulic switching valve 15 incorporating a temperature control valve 17 shown in FIGS. 2 and 6 is interposed.

This hydraulic switching valve 15 is rotated by a handle 16, and the built-in temperature control valve 17 expands when the hydraulic oil is at a high temperature and moves by pressing a spring 17A as shown in FIG. Since there is communication between the hydraulic pump 14 and the hydraulic oil supply passage 12 that operates the hydraulic piston 10, the hydraulic piston 10 operates up to the stopper 1OA position as shown in the side sectional view of the main part in FIG. The hydraulic piston 7 will also be pushed out to the position shown in FIG.

Therefore, when the handle 16 of the hydraulic pressure switching valve 15 shown in FIG. 2 is operated, the valve body 15A rotates from the state of the valve body 15A shown in FIGS. Since the hydraulic oil supply passage 11 to be operated communicates with the hydraulic pump 14 side, these two hydraulic pistons 7 and 10 operate together, so the distance between them and the friction plate 6 in this case becomes smaller.

In addition, in FIG. 2, 18 is a safety valve, 19 is a hydraulic oil pressure regulating valve, and 20 is a lubricating oil pressure regulating valve, and 11 in FIG.
21 is a hydraulic oil supply passage for operating the piston 7, 21 is a hydraulic oil supply passage for the reverse friction plate 22, and 26 in FIG. 5 is a drain passage.

On the other hand, when the hydraulic oil is at a low temperature, the temperature control valve 17 contracts as shown in FIG. 6, and the hydraulic oil supply passage 12, which operates the piston 10 by being pressed by the spring 17A, is closed. Since the piston 10 does not operate and only the piston 7 operates, the distance between it and the friction plate increases.

In the drag prevention device of the first embodiment having the above-described configuration, the interval between the friction plates 6 can be adjusted according to changes in the temperature of the hydraulic oil, preventing drag at low temperatures and reducing clutch engagement time at high temperatures. I can do it to the bare minimum.

Next, FIG. 9 is a side sectional view of a hydraulic switching valve for wet clutch operation in Embodiment 2 of the present invention, and FIG. 10 is an I of FIG.
-I direction, FIG. 11 is a front sectional view in the II-I direction of FIG. 9, FIG. 12 is a front sectional view in the l1l-I11 direction of FIG. FIG. 14 is a front sectional view taken along the ■-■ direction of FIG. The hydraulic switching valves 15 and 25 that communicate or close the hydraulic pump 14 and the hydraulic oil supply passages 1j, 12 that operate the main and auxiliary hydraulic screws 7, 10 are shown, and are similar to those of the first embodiment. Identical parts are indicated by the same part number.

Therefore, in place of the temperature control valve 17 that opens and closes the hydraulic oil supply passage 12 of the auxiliary hydraulic piston 10 in the first embodiment, in the second embodiment, a hydraulic switching valve 25 operated by the no./dollar 24 is used. It is provided coaxially with the hydraulic switching valve 15, and when the hydraulic oil is at high temperature, the hydraulic oil supply passage 12 of the auxiliary hydraulic piston 10 is communicated with the hydraulic pump 14 side as shown in FIGS. 13 and 14. As shown in Figure 7 of 1,
When the hydraulic fluid is at a low temperature, the communication can be cut off and the state shown in FIG. 8 of the first embodiment can be achieved.
10, 11, and 12 to connect the hydraulic oil supply jlff circuit 11 of the main hydraulic piston 7 with the hydraulic pump 14 side, providing the same function as in the first embodiment. ing.

Therefore, if the wet clutch anti-slip device of the present invention is applied, the gap between the friction plates of the wet clutch can be adjusted from the outside, so the anti-slip effect can be improved, and the clutch initialization time can be improved. It has the effect of being able to minimize it.

Note that the present invention can be effectively applied mainly to a reduction/reversing machine having a hydraulically operated wet clutch.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view of a main part of a wet clutch in Embodiment 1 of the present invention, FIG. 2 is a side cross-sectional view of a hydraulic switching valve for operating the wet clutch in FIG. 1, and FIG. Figure 4 is a front cross-sectional view in the II-II force direction of Figure 2, Figure 5 is a front cross-sectional view in the ■-■ direction of Figure 2, and Figure 6 is a front cross-sectional view in the -I direction of Figure 2. A side cross-sectional view of the main parts showing the temperature control valve when the lubricating oil is at low temperature.
7 and 8 are side cross-sectional views of main parts showing operating states according to changes in hydraulic oil temperature in the wet type clutch anti-slip device shown in FIG. 1, and FIG. 9 is a wet type clutch according to the second embodiment of the present invention. A side sectional view of the hydraulic switching valve for clutch operation, Fig. 10 is a front sectional view in the I-, I direction of Fig. 9, Fig. 11 is a front sectional view in the ■-■ direction of Fig. 9, and Fig. 12 13 is a front sectional view taken along the line 2--IV in FIG. 9, FIG. 14 is a front sectional view taken along the line 2-IV in FIG. 9. 6...Wet clutch, 4...Clutch clutch, 5...Steel plate, 6...Friction plate, 7...
・Main hydraulic piston, 8... Working cylinder, 10... Sub-hydraulic piston, 11.12... Hydraulic oil supply passage, 15...
- Hydraulic switching valve, 17... Temperature control valve, 25... Hydraulic switching valve. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita 3rd Ward...@4×＼

Claims (1)

[Claims] In addition to the main piston that presses the steel plate and friction plate into the operating cylinder of the wet clutch, there is also an auxiliary hydraulic piston that can operate in the same direction as the main piston, and hydraulic oil is supplied to each of these main and auxiliary hydraulic pistons. A wet clutch characterized in that a hydraulic switching valve is provided in the passage, which allows communication between both hydraulic oil supply passages when the hydraulic oil is at a high temperature, and which allows communication between only one hydraulic oil supply passage when the hydraulic oil is at a low temperature. A sagging prevention device.