JPH0613266B2 - Hydraulic circuit structure of hydraulically controlled clutch and transmission - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hydraulic control type clutch and a hydraulic circuit for a transmission.

<Prior Art> There is a device for automatically controlling a clutch and a transmission of an automobile by hydraulic pressure. As shown in FIG. 5, the mechanism includes a flow rate control valve 33 that controls the pressure oil discharged from the oil pump 1 to a constant flow rate, and a pressure control valve that controls the constant flow rate to the clutch control cylinder 8 side. An electromagnetic switching valve 4 for switching to the transmission control cylinder side, a switching valve 14 for switching and supplying the pressure oil to the clutch disconnection chamber 10 side and the clutch connection chamber 11 side of the clutch control cylinder 8,
A clutch hydraulic pressure control valve 5 that controls switching of the switching valve 14,
An electromagnetic pressure control valve 16 for controlling the clutch hydraulic pressure control valve 5
And a transmission oil pressure control valve 4a for controlling the transmission oil pressure is provided in the pressure oil feed passage 3 for dividing 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 control valve 4a, are required to control the pressure oil to the clutch and the transmission control cylinder. However, there was a problem of increased cost and increased weight.

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

<Means for Solving Problems> A feature of the present invention for achieving the above object is to provide a flow control valve for controlling a constant flow rate of pressure oil discharged from an oil pump and a constant flow rate control valve. And a pressure oil supply passage for branching the generated pressure oil to the clutch control cylinder side and the transmission control cylinder side, and the pressure oil is switched and supplied to the clutch disconnection chamber side and the clutch connection chamber side of the clutch control cylinder. In a hydraulic control type clutch and transmission including a switching valve, a clutch hydraulic control valve that controls switching of the switching valve, and an electromagnetic pressure control valve that controls the clutch hydraulic control valve, the flow is diverted to the clutch control cylinder side. A clutch and a transformer are provided in the passage for controlling the pressure oil in the pressure oil supply passage by the clutch hydraulic pressure control valve and supplying the pressure oil to one oscillating port of the switching valve. An electromagnetic switching valve for switching missions is provided.

<Operation> According to the present invention having the above configuration, a switching valve for disconnecting and connecting the clutch is controlled by one electromagnetic switching valve, and switching control is performed between the pressure oil for clutch control and the pressure oil for transmission control. Is.

<Examples> Examples of the present invention will be described below with reference to the drawings. Reference numeral 1 is an oil pump, 33 is a flow rate adjusting valve that makes the pressure oil discharged from the oil pump 1 have a constant flow rate, and 34 is a filter.
The pressure oil discharged from the oil pump 1 is divided into a pressure oil feed passage 2 on the clutch side and a pressure oil feed passage 3 on the transmission side.

A clutch control cylinder 8 is provided on the clutch side. This clutch control cylinder 8 has a piston 9
Thus, a clutch disengagement chamber 10 and a clutch connection side chamber 11 are formed, and both chambers 10 and 11 are communicated with each other through an orifice 12 provided in the piston 6.

The circuit configuration for controlling the supply of pressure oil to the clutch control cylinder 8 is as follows. A circuit 6 communicating with the clutch disengagement side chamber 10 from the pressure oil supply passage 2 via the clutch pressure oil control valve 5, and a check valve 13 and a switching valve from the pressure oil supply passage 2.
A circuit 15 communicating with the clutch disengagement side chamber 10 via 14 and an electromagnetic pressure control valve 16 arranged in a relief passage 17 communicating with the low pressure side for controlling the clutch hydraulic pressure control valve 5 are provided in the circuit 6. Is provided with a back pressure valve 7 which supplies pressure oil to the clutch disengagement side chamber 10 while always controlling the pressure oil to a constant pressure.

On the other hand, the transmission side has a select cylinder for selectively operating the transmission (not shown) and a shift cylinder for performing the shift operation.
Supply the pressure oil to the select cylinder and discharge it to the low pressure side, and to the shift cylinder,
It also has a shift / select control valve consisting of an electromagnetic shift valve for discharging to the low pressure side and a manually operated valve.

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

The clutch manual control valve 24 is arranged between the clutch hydraulic pressure control valve 5 and the electromagnetic pressure control valve 16 in relation to the switching valve 14. That is, the clutch pressure oil control valve 5 and a valve portion for opening and closing the relief passage 17 of the electromagnetic pressure control valve 16,
A valve portion that opens and closes a passage 19 connected to an operation port on the right side in the drawing of the switching valve 14 from the pressure oil feed passage 2 before the check valve 13 via the passage 18, and a left portion in the drawing of the switching valve 14 One of the operation ports is provided with a valve portion for relieving a constant pressure signal pressure supplied from the circuit 6 through the passage 20 to the low pressure side, and a hydraulic control valve 25 having the same function as the electromagnetic pressure control valve 16. Has been done.

According to the present invention, in the hydraulic control circuit for the hydraulic control type clutch and transmission as described above, the clutch pressure oil control valve 5 controls the pressure oil in the pressure oil supply passage 2, and the switching valve 14
In the figure, an electromagnetic switching valve 40 is provided in the passage 19 connected to the operation port on the right side.

Next, the operation of the above configuration will be described. First, normally, the clutch manual control valve 24 is provided with a relief passage between the clutch hydraulic pressure control valve 5 and the electromagnetic pressure control valve 16.
17 is opened, the passages 18 and 19 are brought into communication with each other, and the relief circuit of the passage 26 and the pressure oil control valve 25 is closed. Thus, the electromagnetic pressure control valve 16 operates to control the clutch hydraulic pressure control valve 5, and the clutch hydraulic pressure control valve 5 controls the switching valve 14 to switch the clutch connection side chamber 10
When the pressure oil supplied to the clutch disengagement side chamber 11 is equal to or higher than a certain pressure, the clutch is brought into contact with the clutch disengagement side chamber 11. The supplied pressure oil is relieved to the low pressure side by the switching valve 14 to perform the clutch disengagement operation.

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

Therefore, the control action of the pressure oil by the electromagnetic switching valve 40 will be described. FIG. 2 shows a state in which the electromagnetic pressure control valve 16 and the electromagnetic switching valve 40 are opened without energizing the solenoid. In this case, the pressure oil from the pressure oil supply passage 2 is guided through the circuit 6 to the clutch return pressure PC ₂ to the clutch disengagement chamber 10, and the clutch connection chamber 11
The clutch pressing pressure PC ₁ of the circuit 15 communicating with the side is 0. The pressure PS of the pressure oil flowing from the pressure oil supply passage 3 to the shift unit of the transmission is low.

In the above state, as shown in FIG. 3, when the solenoid of the electromagnetic pressure control valve 16 is energized and the relief passage 17 is closed, the pressure PP of the pump discharge pressure oil in the pressure oil feed passages 2 and 3 rises,
19, the spool of the switching valve 14 moves leftward by the pressure oil supplied from the operation port on the right side of the switching valve 14 through the electromagnetic switching valve 40, and the clutch pressing pressure PC ₁ becomes high pressure and the clutch return pressure PC ₂ Becomes low and the clutch is engaged. The clutch pressing pressure PC ₁ 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 feed passage 3 toward the transmission side also increases. When the electromagnetic switching valve 40 is turned on and off in the state shown in FIG. 3, the clutch pressing pressure PC ₁ is affected and the clutch is disengaged and brought into contact.

Further, as shown in FIG. 4, when the relief passage 17 is closed by the electromagnetic pressure control valve 16 and at the same time current is applied to the solenoid of the electromagnetic switching valve 40 to close the passage 19, the switching valve is closed.
The operation port on the right side of 14 communicates with the low pressure side, the spool of the switching valve 14 moves to the right, the circuit 15 communicating with the clutch disengagement chamber 10 side is closed, and the clutch pressing pressure PC ₁ becomes zero.
Therefore, the clutch is disengaged. Even if this clutch is disengaged, the electromagnetic pressure control valve 16 is turned on, so the relief passage 17 is closed, and the pressure PS of the pressure oil to the transmission side remains high. Therefore, the shift unit can 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 switched and supplied to the clutch control cylinder side and the transmission control cylinder side by one electromagnetic switching valve. Therefore, the number of solenoid valves can be reduced, which has the advantages of cost reduction and weight reduction.

[Brief description of drawings]

FIG. 1 is a hydraulic control circuit diagram of the present invention, FIGS. 2, 3, and 4 are explanatory diagrams of hydraulic control operation according to the present invention, and FIG. 5 is a conventional hydraulic control circuit diagram. 1 ... Oil pump, 2, 3 ... Pressure oil feed passage, 5 ... Clutch hydraulic pressure control valve, 8 ... Clutch control cylinder, 14 ... Switching valve, 16 ... Electromagnetic pressure control valve, 19 ... Passage, 33 ... Flow control valve ,
40 ... Solenoid switching valve.

Claims (1)

[Claims] 1. A flow rate control valve for controlling a constant flow rate of pressure oil discharged from an oil pump, and a pressure oil for dividing the pressure oil controlled at a constant flow rate into a clutch control cylinder side and a transmission control cylinder side. A supply passage, a switching valve for switching and supplying the pressure oil to the clutch disconnection chamber side and the clutch connection chamber side of the clutch control cylinder, a clutch hydraulic control valve for switching control of the switching valve, and the clutch hydraulic control valve. In an oil pressure control type clutch and a transmission equipped with an electromagnetic pressure control valve for controlling the pressure control valve, the pressure oil in the pressure oil supply passage diverted to the clutch control cylinder side is controlled by the clutch oil pressure control valve to control the switching valve. A hydraulically controlled clutch characterized in that a clutch and an electromagnetic switching valve for switching the transmission are provided in a passage for supplying to one oscillating port. Hydraulic circuit structure of the transmission.