KR20050069750A - Torque converter pressure control valve of automatic transmission - Google Patents

Abstract

The torque converter pressure regulating valve of the automatic transmission of the present invention includes a first port for receiving hydraulic pressure from an oil pump, a second port for returning hydraulic pressure supplied to the first port to an oil pan, and hydraulic pressure to the torque converter. A valve body having a third port for supplying, a fourth port for providing a control pressure, a valve spool embedded in the valve body to control the hydraulic pressure supplied to the torque converter by opening and closing the ports, and It is configured to include a solenoid installed on one side to reduce the flow rate supplied to the torque converter by pushing the valve spool when the idle state, it is possible to improve the fuel economy by reducing the load of the impeller by reducing the rotational flow in the torque converter in the idle state To provide.

Description

Torque converter pressure control valve for automatic transmission {TORQUE CONVERTER PRESSURE CONTROL VALVE OF AUTOMATIC TRANSMISSION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control system of an automatic transmission, and more particularly, to a torque converter pressure regulating valve of an automatic transmission to reduce fuel horsepower of an impeller and improve fuel efficiency by reducing internal pressure of a torque converter.

In general, the automatic transmission is a torque converter that is operated in accordance with the drive of the engine to increase the torque to transmit to the input shaft of the transmission; A plurality of gears such as sun gear, carrier and ring gear are used to form a multi-speed stage by using the driving force input from the torque converter as input elements, reaction force elements and output elements, respectively, through a plurality of friction elements of clutches and brakes. A planetary gear device forming a predetermined gear train by means of; An oil pump operated according to driving of an engine to discharge the rated flow rate required for operation of the torque converter, a plurality of friction elements, and lubrication of various lubrication parts in the transmission; The hydraulic oil supply and release of the hydraulic pressure to the corresponding friction elements of the torque converter and the planetary gear unit are respectively switched for the operation of the selected shift mode during manual shifting or the preset shift pattern for automatic shifting via the hydraulic oil discharged from the oil pump. In addition, the hydraulic control device having a valve body for forming a flow path to the friction element by installing a predetermined direction switching and pressure control valves to improve the feeling of shifting through pressure control during shifting; In order to operate from the selected shift mode to a predetermined shift pattern during shifting, various driving information is input from the engine and the planetary gear unit, and the control signals necessary for the operation of the hydraulic control device, that is, specific valves of the hydraulic control device, respectively. And a shift control device for outputting a corresponding control signal for on / off control or duty control.

Here, the hydraulic control device maintains a flow rate discharged according to the operation of the oil pump at a constant pressure (hereinafter referred to as line pressure) according to the input torque of the engine and the operating conditions of the transmission, and at the time of mode switching of the shift range. Line pressure regulation and adjusting means for varying the degree of line pressure; A torque converter and damper clutch control means for supplying the line pressure supplied from the line pressure regulating and regulating means to each of the lubrication portion and the torque converter side of the transmission to facilitate the operation of the torque converter as well as the operation and release of the damper clutch; Flow path switching to form a flow path for supplying the working pressure to the friction element from the manual valve interlocked according to the selection of the select lever so as to facilitate the engagement or release of the friction element according to the opening degree of the throttle valve and the vehicle speed and the selected shift stage while driving. Means; Pressure control means for appropriately controlling the operating pressure supplied from the manual valve to the corresponding friction element through the flow path formed by the flow path switching means to reduce the shock generated during shifting and to improve the quality of the shift. This is done by adding.

1 is a partial circuit diagram of a hydraulic control apparatus of an automatic transmission according to the prior art.

Torque converter and damper clutch control means, which is one of the components of the hydraulic control device, receives the line pressure from the oil pump 102 and constantly adjusts the internal pressure of the torque converter 104. And a damper clutch control valve 110 for controlling the flow of the hydraulic oil whose pressure is controlled from the torque converter pressure regulating valve 106 to operate or release the damper clutch 108 installed in the torque converter 104. It is configured by.

Here, when the damper clutch 108 is operated or released, the damper clutch control valve 110 is supplied with different operating pressures. First, the damper clutch control valve 110 is released when the damper clutch 108 is released. Is to receive the adjusted pressure from the torque converter pressure control valve 106, the damper clutch control valve 110 is supplied under the control of the damper clutch control solenoid valve 112 during the operation of the damper clutch 108. It is intended to receive line pressure.

As shown in FIG. 2, the torque converter pressure regulating valve 106 is formed in the valve body 120 to receive hydraulic pressure from the oil pump 102 and the torque converter 104. The second port 124 for returning the hydraulic pressure to the oil pan 140 and the hydraulic pressure supplied to the first port 122 to the torque converter 104 when the hydraulic pressure supplied to the torque converter 104 is high, the torque converter 104. The control pressure for controlling the valve spool 132 embedded in the valve body 120 is communicated with the third port 126 for generating internal pressure) and the line 130 connected to the third port 126. It consists of a fourth port 128 provided.

In addition, the valve spool 132 is formed with a first land 134 that blocks or opens the second port 124, and a second land 136 provided with the control pressure, and the first land ( Between the 134 and one end of the valve body 120 is provided a spring 138 that provides a constant elastic force to the valve spool 132.

The torque converter hydraulic control valve 106 configured as described above is supplied to the torque converter 104 through the third port 126 when the hydraulic pressure is provided from the oil pump 102 through the first port 122. Generate internal pressure in 104).

When the pressure of the hydraulic pressure provided from the oil pump 102 is high, the valve spool 132 is linearly moved by the control pressure provided through the fourth port 128 to overcome the elastic force of the spring 138. The second port 124 is opened to a certain degree to return the hydraulic pressure so that the constant hydraulic pressure is always provided to the torque converter 104.

That is, the torque converter hydraulic pressure control device according to the prior art according to the movement amount when the valve spool 132 is moved to the left / right by the complementary operation of the hydraulic pressure flowing into the first port 122 and the spring 138. The pressure provided to the torque converter 104 is adjusted according to the returned hydraulic pressure so that the internal pressure of the torque converter 104 is always kept constant.

However, in the hydraulic control apparatus according to the prior art as described above, the internal pressure of the torque converter is always kept constant, so even when the torque converter is lost, such as an idle state, the axial force must not be maintained by the internal pressure of the torque converter. Therefore, there is a problem that the loss of the engine occurs.

The present invention has been made to solve the above problems, by installing a solenoid in the torque converter, the torque converter pressure control valve of the automatic transmission that can improve the fuel efficiency by reducing the load of the impeller by reducing the rotational flow in the torque converter in the idle state To provide.

Torque converter pressure control valve of the automatic transmission of the present invention for realizing the above object is a first port for receiving the hydraulic pressure from the oil pump, a second port for returning the hydraulic pressure supplied to the first port to the oil pan, A valve body having a third port for supplying hydraulic pressure to the torque converter, a fourth port for providing a control pressure, and a valve spool embedded in the valve body to open and close the ports to control the hydraulic pressure supplied to the torque converter. And a solenoid installed on one side of the valve spool to reduce the flow rate supplied to the torque converter by pushing the valve spool when in an idle state.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a partial hydraulic circuit diagram showing a hydraulic control apparatus according to the present invention.

As shown in FIG. 3, the hydraulic control apparatus according to the present invention receives a line pressure from the oil pump 2 and a torque converter pressure regulating valve 6 which constantly adjusts the internal pressure of the torque converter 4. And a damper clutch control valve 10 for controlling the flow of the hydraulic oil whose pressure is adjusted from the torque converter pressure regulating valve 6 to operate or release the damper clutch 8 installed in the torque converter 4. do.

The torque converter 4 has an impeller 12 fixed to the crankshaft of the engine and rotates together, a turbine 14 splined to the input shaft of the transmission and disposed opposite the impeller 12, and the impeller 12 and It is composed of a stator 16 and the like positioned between the turbine 14 to change the flow of oil.

The damper clutch control valve 10 is first to receive a pressure adjusted from the torque converter pressure control valve 6 when the damper clutch 8 is released, and the damper clutch control solenoid when the damper clutch 8 is operated. The line pressure supplied under the control of the valve 18 is received.

4 is a cross-sectional view of the torque converter pressure control valve according to the present invention.

The torque converter pressure regulating valve (6) is a valve body (30) in which a plurality of ports are formed, and the hydraulic pressure supplied to the torque converter (4) by opening and closing the port is arranged to be linearly movable in the valve body (30) And a valve spool 40 for controlling the pressure, and installed at one side of the valve spool 40 to reduce the flow rate supplied to the torque converter 4 by pushing the valve spool 40 when the idle state or the low speed state before the vehicle stops. It consists of a solenoid 50.

The valve body 30 has a first port 32 for receiving hydraulic pressure from the oil pump 2 and a second port 34 for returning the hydraulic pressure supplied to the first port 32 to the oil pan 20. And a third port 36 for providing internal pressure to the torque converter by providing the hydraulic pressure supplied to the first port 32 to the torque converter 4, and a line connected to the third port 36. And a fourth port 38 which is in communication with 42 and is provided with a control pressure for controlling the valve spool 40 embedded in the valve body 30.

The valve spool 40 is formed with a first land 46 that blocks or opens the second port 34, and a second land 48 that receives the control pressure.

In addition, the solenoid 50 has a body 52 disposed on one side of the valve spool 40, and is disposed to be linearly movable within the body 52, and contacts one end of the valve spool 40. And a working rod 54 disposed on the inner circumferential surface of the body 52 to linearly move the working rod 54 according to on / off of power, It is composed of a spring 58 disposed between the other end and the body 52 to provide a constant elastic force to the working rod 54.

The operation of the torque converter pressure control valve 6 according to the present invention configured as described above will be described below. When driving after the vehicle starts, the power supply to the solenoid 50 is cut off, and the pressure regulating valve 6 operates in the same manner as the conventional pressure regulating valve described above.

That is, when oil pressure is supplied from the oil pump 2 to the first port 32, the oil pressure is supplied to the torque converter 4 via the third port 36 to generate internal pressure in the torque converter 4. When the pressure supplied to the first port 32 increases during this operation, a control pressure is provided through the fourth port 38 so that the valve spool 40 overcomes the elastic force of the spring 58 and pushes the first port ( The hydraulic pressure provided to 32 is returned to the oil pan 20 through the second port 34 to keep the internal pressure of the torque converter 4 constant.

When the vehicle is switched to the idle state or the low speed state before the stop during this operation, the power is applied to the coil 56 of the solenoid 50, accordingly, if the operating rod 54 is moved to the left in the drawing, the second Open the port 34. Then, the hydraulic pressure supplied to the first port 32 is returned through the second port 34 so that the circulation flow rate of the torque converter 4 is reduced, thereby reducing the amount of fluid to which the impeller 12 transmits momentum. Thus, the load on the impeller 12 can be reduced to improve idle fuel economy.

That is, in detail, since the torque converter 4 operates only the impeller 12 during idle operation of the engine, since the stationary turbine 14 may be regarded as a fixed flow path, the engine may not have an impeller (4) of the torque converter 4. It can be seen that only 12).

In this case, the impeller 12 can be seen as one centrifugal pump that continues to be useless and the flow force is reduced due to the characteristics of the general fluid machinery, which can be seen to reduce the loss of the engine.

Therefore, as described above, reducing the flow rate supplied to the torque converter during idle operation can reduce the loss of the engine.

Therefore, the torque converter pressure control valve of the automatic transmission of the present invention constructed and operated as described above, by reducing the flow rate provided to the torque converter during idle by installing a solenoid can reduce the load of the impeller to improve the fuel economy of the engine There is an advantage.

1 is a partial hydraulic circuit diagram showing a hydraulic control system of an automatic transmission according to the prior art;

Figure 2 is a cross-sectional view of the torque converter pressure control valve according to the prior art,

3 is a partial hydraulic circuit diagram showing a hydraulic control system of an automatic transmission according to the present invention;

4 is a cross-sectional view of the torque converter pressure control valve according to the present invention.

<Explanation of symbols for the main parts of the drawings>

2: oil pump 4: torque converter

6: Torque converter pressure regulating valve 8: Damper clutch

10 damper clutch control valve 30valve body

32: first port 34: second port

36: third port 38: fourth port

40: valve spool 50: solenoid

52: body 54: working rod

56: coil 58: spring

Claims (2)

A first port for receiving hydraulic pressure from an oil pump, a second port for returning hydraulic pressure supplied to the first port to an oil pan, a third port for supplying hydraulic pressure to the torque converter, and a control pressure provided thereto. A valve body having four ports formed thereon; A valve spool embedded in the valve body to control the oil pressure supplied to the torque converter by opening and closing the ports; And a solenoid installed on one side of the valve spool to reduce the flow rate supplied to the torque converter by pushing the valve spool when in an idle state. The method of claim 1, A body disposed at one side of the valve spool; An actuating rod disposed in the body to be linearly movable and in contact with one end of the valve spool; A coil disposed on an inner circumferential surface of the body to linearly move the working rod when idle; Torque converter pressure control valve of the automatic transmission, characterized in that consisting of a spring disposed between the other end of the operating rod and the body to provide a predetermined elastic force to the operating rod.