JPS63251338A - Hydraulic circuit structure for hydraulically controlled clutch, transmission - Google Patents

Abstract

PURPOSE:To aim at reducing the number of solenoid valves by enabling oil discharged from an oil pump to be selectively fed to both cylinders for a clutch and a transmission by use of one solenoid selector valve. CONSTITUTION:In a hydraulic circuit for a hydraulically controlled clutch and a transmission, a clutch hydraulic pressure control valve 5 controls hydraulic oil in a hydraulic oil feed passage 2, and a solenoid change-over valve 40 is disposed in a passage 19 connected to a right operation port in a selector valve 4. A manually clutch control valve 24 opens a relief passage 17 between the clutch hydraulic pressure control valve 5 and a solenoid pressure control valve 16 so as to communicate passages 18, 19 with each other while a relief circuit composed of a passage 26 and a hydraulic control valve 25 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a hydraulic circuit for a hydraulically controlled clutch and transmission.

<Prior Art> There is a device that automatically controls the clutch and transmission of an automobile using hydraulic pressure. As shown in FIG. 5, the mechanism includes a flow control valve 33 that controls the pressure oil discharged from the oil pump 1 at a constant flow rate, and a circuit between the clutch control cylinder 8 side and the pressure oil controlled at a constant flow rate. an electromagnetic switching valve 4 that switches the pressure oil to the transmission control cylinder side and the clutch disconnection chamber 1 of the clutch control cylinder 8;
0 side and the clutch connection chamber II side, a clutch oil pressure control valve 5 that switches and controls this switching valve 14, and an electromagnetic pressure control valve 16 that controls this clutch oil pressure control valve 5. A transmission hydraulic pressure control valve 4a for controlling the transmission hydraulic pressure is provided in the pressure oil supply passage 3 that diverts the pressure oil to the transmission control cylinder side.

<Problems to be Solved by the Invention> Therefore, in the above-mentioned conventional configuration, two valves, the electromagnetic switching valve 4 and the transmission hydraulic pressure control valve 4a, are used to control the pressure oil to the cylinder for controlling the cylinder and the transmission. This requires a valve, which increases cost and weight.

An object of the present invention is to provide a hydraulic circuit structure in which pressure oil for a clutch and a transmission is controlled by a single electromagnetic switching valve.

Means for Solving the Problems> The features of the present invention to achieve the above object include a flow control valve that controls the pressure oil discharged from the oil pump to a constant flow rate; A pressure oil supply passage that divides the pressure oil into the clutch control cylinder side and the transmission control cylinder side, and switches the pressure oil between the clutch disconnection chamber side and the clutch connection chamber side of the clutch control cylinder side. In a hydraulically controlled clutch and transmission that includes a switching valve to supply, a clutch hydraulic control valve that switches and controls the switching valve, and an electromagnetic pressure control valve that controls the clutch hydraulic control valve, the clutch control cylinder side An electromagnetic switching valve for switching a clutch and a transmission is provided in a passage in which the pressure oil in the branched pressure oil supply passage is controlled by the clutch hydraulic control valve and is supplied to one oscillating boat of the switching valve.

<Operation> The present invention with the above configuration controls a switching valve that switches between disconnecting and connecting the clutch using one electromagnetic switching valve, and controls switching between pressure oil for clutch control and pressure oil for transmission control. It is.

<Examples> Examples of the present invention will be described below based on the drawings. 1 is an oil pump, 33 is a flow rate regulating valve that maintains a constant flow rate of the pressure oil discharged from the oil pump 1, and 34 is a filter. Pressure oil discharged from the oil pump 1 is divided into a pressure oil supply passage 2 to the clutch side and a pressure oil supply passage 3 to the transmission side.

A clutch control cylinder 8 is provided on the clutch side. This clutch control cylinder 8 has a piston 9
This forms a clutch disconnection chamber IO and a clutch connection side chamber 11, and these chambers 10.11 communicate with each other via an orifice 12 provided in the piston 9.

The circuit configuration for controlling the supply of pressure oil to the clutch control cylinder 8 is as follows. A circuit 6 communicates from the pressure oil supply passage 2 with the clutch disconnection side chamber 10 via the clutch pressure oil control valve 5, and a circuit 6 communicates with the clutch disconnection side chamber 10 from the pressure oil supply passage 2 through the check valve 13 and the switching valve 14. It has a communicating sliding circuit 15 and an electromagnetic pressure control valve 16 disposed in a relief passage 17 communicating with the low pressure side for controlling the clutch oil pressure control valve 5.
and a back pressure valve 7 that always controls and supplies pressurized oil at a constant pressure.

On the other hand, the transmission side has a selection cylinder that selects and operates a transmission of the same rank, and a shift cylinder that operates a shift.
An electromagnetic select valve that supplies pressurized oil to the select cylinder and discharges it to the low pressure side, and a shift cylinder.
It is also equipped with a shift and select control valve consisting of an electromagnetic shift valve and a manually operated valve for discharging to the low pressure side.

Further, a clutch manual control valve 24 is provided on the clutch side.

The clutch manual control valve 24 is a switching valve 1 between the clutch hydraulic control valve 5 and the electromagnetic pressure control valve 16.
It is placed in relation to 4. That is, the clutch pressure oil control valve 5 and the valve part that opens and closes the relief passage 17 of the electromagnetic pressure control valve 16 are connected to the switching valve 14 from the pressure oil supply passage 2 before the check valve 13 through the passage 18 to the right in the figure. A valve part that opens and closes a passage 19 connected to one operation boat, and a constant signal pressure supplied to the operation boat on the left side in the diagram through a passage 20 from a circuit 6, are connected to a low-pressure side relief. The hydraulic pressure control valve 25 has the same function as the electromagnetic pressure control valve 16.

The present invention provides a hydraulically controlled Clara as described above.

H. In the hydraulic control circuit of the transmission, the clutch pressure oil control valve 5 controls the pressure oil in the pressure oil supply passage 2, and the electromagnetic switching valve is connected to the passage 19 connected to the operation port on the right side in the diagram of the switching valve 14. 40.

Next, the operation of the above configuration will be explained. First, normally, the clutch manual control valve 24 opens the relief passage 17 between the clutch hydraulic control valve 5 and the electromagnetic pressure control valve 16, and brings the passages 18 and 19 into communication.
The relief circuit of the passage 26 and the pressure oil control valve 25 is closed. As a result, the electromagnetic pressure control valve I6 operates to control the clutch hydraulic pressure control valve 5, and the switching valve 14 is controlled to switch by controlling the clutch hydraulic pressure control valve 5.
The clutch is engaged by supplying pressure oil above a certain pressure, which is supplied to the clutch disconnection side chamber 11, to the clutch connection side chamber 10, and the clutch is disconnected by relieving this supplied pressure oil to the low pressure side by the switching valve 14. I do.

On the other hand, the transmission is operated to shift and select a predetermined range by a shift and select control valve.

Therefore, the control action of the pressure oil by the electromagnetic switching valve 40 will be explained. FIG. 2 shows the state in which the electromagnetic pressure control valve 16 and the electromagnetic switching valve 40 are in an open state with no current applied to the solenoids. In this case, the pressure oil from the pressure oil supply passage 2 is guided to the clutch return pressure PC2 through the circuit 6 to the clutch disconnection chamber 10, and the clutch pressing pressure Pct of the circuit 15 communicating with the clutch connection chamber 11 side is
is O. Further, the pressure PS of the pressure oil flowing from the pressure oil supply passage 3 to the shift unit of the transmission is low pressure.

In the above state, as shown in FIG. 3, the electromagnetic pressure control valve 16
When the solenoid is energized and the relief passage 17 is closed, the pressure PP of the pump discharge pressure oil in the pressure oil supply passage 2.3 increases, and the pressure PP of the pump discharge pressure oil in the pressure oil supply passage 2.3 increases. Pressure oil supplied from the operation boat on the right side of the switching valve 14 through the electromagnetic switching valve 40 moves the spool of the switching valve I4 to the left, and the clutch pressing pressure P is increased.
ct becomes high pressure, clutch return pressure PC2 becomes low pressure, and the clutch is connected. This clutch pressing pressure Pct can be controlled by the current value applied to the solenoid of the electromagnetic pressure control valve 16.

On the other hand, as the pressure PP increases, the pressure PS of the pressure oil flowing through the pressure oil supply passage 3 toward the transmission side also increases. When the electromagnetic switching valve 40' is turned ON-OFF in the state shown in FIG. 3, the clutch pressing pressure Pct is affected and the clutch is disengaged and engaged.

Furthermore, as shown in FIG. The other operation port communicates with the low pressure side, the spool of the switching valve 14 moves to the right, the circuit 15 communicating with the clutch disconnection chamber 10 side is closed, and the clutch pressing pressure PC+ becomes O. The clutch is therefore disengaged. Even if this clutch is disengaged, the electromagnetic pressure control valve 16 remains ON, so the relief passage 17 remains closed, and the pressure PS of the pressurized oil to the transmission side remains at a high pressure. This allows the shift unit to be operated with the clutch disengaged.

<Effects of the Invention> As described above, according to the present invention, the pressure oil discharged from the oil pump is selectively supplied to the clutch control cylinder side and the transmission control cylinder side using one electromagnetic switching valve. Because of this, the number of solenoid valves can be reduced, which has the advantage of cost reduction and weight reduction.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic control circuit diagram of the present invention, and FIG. 2 is a hydraulic control circuit diagram of the present invention. 3 and 4 are explanatory diagrams of the hydraulic control action according to the present invention, and FIG. 5 is a conventional hydraulic control circuit diagram.

Claims (1)

[Claims] a flow control valve that controls the pressure oil discharged from the oil pump to a constant flow rate; a pressure oil supply passage that divides the pressure oil controlled to a constant flow rate into a clutch control cylinder side and a transmission control cylinder side; A switching valve that selectively supplies the pressure oil to the clutch disconnecting chamber side and the clutch connecting chamber side of the clutch control cylinder, a clutch hydraulic control valve that switches and controls this switching valve, and an electromagnetic pressure that controls this clutch hydraulic control valve. In a hydraulically controlled clutch and transmission equipped with a control valve, the pressure oil in the pressure oil supply passage branched to the clutch control cylinder side is controlled by the clutch hydraulic control valve and sent to one oscillation port of the switching valve. A hydraulic circuit structure for a hydraulically controlled clutch and transmission, characterized in that a supply passage is provided with an electromagnetic switching valve for switching the clutch and transmission.