KR100227894B1 - Pressure adjusting device of hydraulic control system - Google Patents

Abstract

By using the existing damper clutch control solenoid valve, the line pressure can be reduced even at high speed in the "D" range 3, 4 speed, thereby reducing the load of the oil pump to significantly reduce fuel economy; A damper clutch control valve for actuating / deactivating the damper clutch of the torque converter by varying the hydraulic pressure generated in the oil pump; A torque converter control valve for constantly adjusting the torque converter pressure; A pressure regulating valve for varying the line pressure during mode switching to the "N" range and the "D" range or the "R" range; A high-low pressure valve controlled by the damper clutch solenoid valve and adjusting the line pressure of the pressure regulating valve by hydraulic pressure supplied from an end clutch; It is connected to the manual valve which is linked by the shift lever, and provides a hydraulic control device of a four-speed automatic transmission hydraulic control system for automobiles comprising a reducing valve for producing a constant pressure lower than the line pressure.

Description

Pressure regulating device of 4 speed automatic transmission hydraulic control system for automobile

1 is a hydraulic circuit diagram of a line pressure control and a damper clutch control unit according to the present invention.

2 is a schematic overall hydraulic circuit diagram of a hydraulic control system to which the present invention is applied.

Figure 3 is an enlarged cross-sectional view of the main portion for showing the operating state of the present invention.

4 is a hydraulic circuit diagram for explaining the prior art.

[Field of Invention]

The present invention relates to a hydraulic control device of a four-speed automatic transmission hydraulic control system for automobiles, and more particularly, to reduce the load of the oil pump by constantly reducing the line pressure during high-speed driving, to improve fuel efficiency, and to use the existing The present invention relates to a damper clutch control solenoid valve and a hydraulic control device capable of simultaneously operating a damper clutch and reducing pressure.

[Private Technology]

The automatic transmission for automobiles has a torque converter and a multistage gear mechanism connected to the torque converter, and a hydraulically operated friction element for selecting one of the gear stages of the transmission gear mechanism according to the operating state of the vehicle. It is included.

The torque converter includes an impeller fixed to the crank shaft of the engine and rotating together, a turbine coupled to the input shaft of the transmission by a spline and disposed to face the impeller, and positioned between the impeller and the turbine to change oil flow. It includes a stator.

An oil pump is installed on the input shaft of the transmission to generate oil pressure when the engine is driven. The oil pressure is supplied to the respective shift valves by a manual valve linked to the shift lever, so that the friction element is changed according to the opening speed of the vehicle and the throttle valve. Will be activated selectively.

As an example of the prior art of such a four-speed automatic transmission hydraulic control device is shown in Figure 4, the hydraulic pressure generated in the oil pump 501 through the line pressure supply line 502, the manual valve 503 and the pressure regulating valve A connection can be made to 504.

In addition, the supply line branched to be connected to the reducing valve 505 in the line pressure supply line 502 is adjusted to a pressure lower than the line pressure, so that the first and second pressure control solenoid valves are provided through the solenoid supply hydraulic line 506. 507 and 508 are connected to the first and second pressure control valves 509 and 510.

In addition, the oil pressure flowing through the pressure regulating valve 504 is supplied to the torque converter control valve 511 and the damper clutch control valve 512 to adjust the lubrication oil pressure when the damper clutch of the torque converter 513 is released. .

The hydraulic pressure supplied to the manual valve 503 is supplied to the shift control valve 514 and the rear clutch release valve 515 and the NR control valve 516 according to the range change, and the shift control valve 514 is "D". A rear clutch release valve that receives hydraulic pressure in the range and distributes the hydraulic pressure through the second, third and fourth speed pipelines 519, 520, and 521 according to the control of the first and second shift control solenoid valves 517 and 518. 516, 2-3 / 4-3 shift valve 522, 1-2 shift valve 523, and end clutch valve 524 can supply hydraulic pressure, respectively.

In addition, the hydraulic pressure supplied to the rear clutch release valve 516, the 2-3 / 4-3 shift valve 522, the 1-2 shift valve 523, and the end clutch valve 524 may be the first and second pressures. Operated by the hydraulic pressure supplied from the first and second hydraulic control valves 509 and 510 controlled by the control solenoid valves 507 and 508, the first, second, third and fourth 5 The shift is made by supplying drive pressure to the friction elements 525, 526, 527, 528, and 529.

However, in the conventional hydraulic control device of the four-speed automatic transmission, it is always adjusted to two mode pressures of the "D" range and the "R" range, and the oil pump is maintained at high speed, that is, maintaining unnecessary hydraulic pressure at the 3rd and 4th speeds. As a load is generated, a driving loss of the oil pump is generated, thereby lowering fuel efficiency.

Summary of the Invention

Therefore, the present invention was invented to solve the problems of the prior art as described above, the object of the present invention is to reduce the load of the oil pump by constantly reducing the line pressure at high speed to improve the fuel economy, and This damper clutch control solenoid valve is used to provide the hydraulic control system of the four-speed automatic transmission hydraulic control system for automobiles, which enables the damper clutch operation and pressure reduction to be realized at the same time.

In order to realize this, the present invention provides an automatic control system including a plurality of valves for selectively transmitting the rotational force of the torque converter to the respective gear elements by controlling a plurality of friction elements in proportion to the forward and subsequent speeds by hydraulic pressure generated from the oil pump. A hydraulic control system of a transmission, comprising: a damper clutch control valve for varying the hydraulic pressure generated in the oil pump to activate / deactivate the damper clutch of the torque converter; A torque converter control valve for constantly adjusting the torque converter pressure; A pressure regulating valve for varying the line pressure during mode switching to the "N" range and the "D" range or the "R" range; A high-low pressure valve controlled by the damper clutch solenoid valve and adjusting the line pressure of the pressure regulating valve by hydraulic pressure supplied from an end clutch; It is connected to the manual valve which is linked by the shift lever, and provides a hydraulic control device of a four-speed automatic transmission hydraulic control system for automobiles comprising a reducing valve for producing a constant pressure lower than the line pressure.

The pressure regulating valve is a first port for preventing negative pressure, a second port for supplying hydraulic pressure to the torque converter, a third port for supplying minimal lubrication hydraulic pressure to the torque converter, a fourth port communicating with the pump suction side, and a negative pressure A valve body comprising a fifth port for preventing, a sixth port for communicating with a high-low pressure valve, a seventh port for communicating with a reverse pressure pipeline, and an eighth port for communicating line pressure with a pipeline; A spring which is supported by a spring, selectively disconnects the second port, a second land allowing the discharge of the line pressure according to the left side movement of the valve spool, and a material separating the pilot pressure from the pump suction pressure. And a third land, a fourth land serving as a working surface of the hydraulic pressure flowing into the sixth port, and a fifth land and sixth land serving as a working surface of the hydraulic pressure flowing into the seventh and eighth ports. Provided is a hydraulic control device for a four-speed automatic transmission hydraulic control system for cars consisting of a valve spool.

In the high-low pressure valve is a first port is formed on one side is in communication with the damper clutch control solenoid valve, the second port is in communication with the pressure control valve on the other side, the third channel is connected to the end clutch valve pipe A valve body having a port formed thereon; The first land for opening and closing the third port, and the second land for selectively opening and closing the discharge passage, and the hydraulic control of the hydraulic control system for a four-speed automatic transmission for automobiles, the spring is carried between the second land and the valve body Provide the device.

[Preferred Embodiments of the Invention]

1 is a hydraulic circuit diagram of a line pressure control and a damper clutch control unit according to the present invention, comprising: a torque converter 2 positioned between a crank shaft and a transmission of an engine to transmit power; An oil pump (4) installed in the pump drive hub of the torque converter (2) and having a drive gear that rotates together and a driven gear that rotates by the gear; And a damper clutch control valve 6 for varying the hydraulic pressure generated by the oil pump to activate / deactivate the damper clutch of the torque converter 2; A torque converter control valve 8 which constantly adjusts the torque converter pressure; A pressure regulating valve 10 for varying the line pressure when the mode is switched to the "N" range and the "D" range or the "R" range; A high-low pressure valve 12 for controlling the line pressure of the pressure regulating valve 10 by the hydraulic pressure supplied from the end clutch while being controlled by the damper clutch solenoid valve S1; It is connected to the manual valve 14 which is linked by the shift lever, and comprises a reducing valve 16 for producing a constant pressure lower than the line pressure.

The damper clutch control valve 6 is configured such that the position of the valve spool can be changed by the damper clutch control solenoid valve S1 controlled by the transmission control unit TCU.

The damper clutch control valve 6 is connected to the torque converter 2 via the clutch operating pipe 18 and the clutch non-operating pipe 20 to operate the damper clutch in the torque converter.

The damper clutch control valve 6 has a valve spool 32 having first, second, third, fourth, fifth and sixth lands 22, 24, 26, 28, 30, and 31, 1,2,3,4,5,6,7,8,9 ports (34,36,38,40,42,44,46,48,50), including the first land 22 The spring 54 is supported in the front pressure receiving chamber 52 of the front side to maintain the state in which the valve spool 32 is moved to the right.

In the above, the first port 34 is supplied with the adjusted line pressure through the conduit 56 connected from the pressure control valve 10 and the second port 36 is the conduit 58 connected from the oil pump 4. Through the line pressure is received through, the third port 38 is to receive the reduced pressure from the reducing valve (16).

The fourth port 4 communicates with the damper clutch control solenoid valve S1, and the fifth port 42 and the sixth port 44 connect the clutch operation line 18 and the clutch non-operation line 20. It communicates with the torque converter 2 through, and the 7th port 46 and the 8th port 48 communicate with the conduit 60. As shown in FIG.

The torque converter control valve 8 which is connected on the conduit 56 connecting the damper clutch control valve 6 and the pressure regulating valve 10 to regulate the torque converter pressure constantly has a first port formed in the valve body. 62, a valve having a land 70 supported by a spring 68 to partially return the second ports 66 and the hydraulic pressure flowing into the first port 62 to the second port 66. It consists of the spool 72.

The pressure regulating valve 10 is a valve having a function of regulating the line pressure generated by the oil pump 4, and has a valve body and a valve spool 74 moving therein.

The valve body includes a first port 76 in communication with the line pressure line 58, a second port 82 and a second port 82 in communication with the drive pressure line 78 and the reverse pressure line 80 via a manual valve. A third port 84 and a fourth port 86 and a fifth port 88 for communicating the line pressure supplied to the first port 76 to the conduit 56, and a high-low as the conduit 90; And a sixth port 92 for communicating the pressure valve 12 and a seventh port 94 for partially returning the hydraulic pressure supplied to the first port 76.

The valve spool 74 is supported by a spring 96, and the first land 97 selectively blocks the fourth port 86 and the discharge of the line pressure according to the left movement of the valve spool 74. The second land 98 to allow the water, the third land 100 separating the pilot pressure and the pump suction pressure, and the fourth land acting as a working surface of the hydraulic pressure flowing into the sixth port 92. And a fifth land 104 and a sixth land 106 serving as a working surface of the hydraulic pressure flowing into the third port 84 and the second port 82.

Accordingly, the pressure regulating valve 10 moves the valve spool 74 by the hydraulic pressure flowing into the second, third and seventh ports 82, 84, and 92 to the first port 76. According to the variable adjustment.

And the high-low pressure valve 12 is connected to the damper clutch control solenoid valve (S1) and the conduit (90) connecting the pressure regulating valve 10, the valve body of the first port 108 on one side ) Is formed to communicate with the damper clutch control solenoid valve (S1), the second port 110 is in communication with the pressure regulating valve 10 and the third line is in communication with the end 112 of the end clutch valve. The port 114 is formed.

The valve spool 116 embedded in the valve body includes a first land 118 that opens and closes the third port 114, and a second land 120 that selectively opens and closes the discharge passage Ex. The spring 122 is carried between the two lands 120 and the valve body.

Accordingly, the high-low pressure valve 12 is operated by the on / off control of the damper control solenoid valve S1, and the hydraulic pressure supplied to the end clutch valve at the third and fourth speeds is controlled through the conduit 112. When the hydraulic pressure acting on the first port 108 is released due to the ON operation of the damper control solenoid valve S1, the valve spool 116 is left by the elastic force of the spring 122 while waiting in the third port 114. The third port 114 and the second port 110 are in communication with each other.

Then, the hydraulic pressure thereof is supplied to the pressure regulating valve 10 through the conduit 90 to act on the right side of the fourth land 102 of the valve spool 74 so as to move the valve spool 74 to the left so that the first port ( The line pressure is adjusted while returning a part of the hydraulic pressure supplied to 76 to the seventh port 94.

In addition, the reducing valve 16 is connected to the line pressure line 58 to supply the reduced pressure to the damper clutch control valve 6 and the damper clutch control solenoid valve S1, and the reducing valve 16 is A first port 124 formed in the valve body and communicating with the line pressure line 58, and a second supplying part of the hydraulic pressure flowing into the first port 124 to the damper clutch control valve 6 described above. It consists of a port 126 and a third port 128, and a valve spool 134 having a first land 130 and a second land 132 varying the opening area of these ports.

In addition, the line pressure line 58 is branched to supply the line pressure to the manual valve 14, which is provided with a first port 136 formed in the valve body, and is introduced into the port. Pressure control of the second port 138 for supplying the hydraulic pressure to the shift control valve in the "D", "2" and "L" ranges, and the hydraulic pressure in the "N", "D", "2" and "L" ranges. A third port 140 for supplying to the second port 82 of the valve 10 and a fourth for supplying hydraulic pressure to the rear clutch release valve and the pressure regulating valve 10 and the NR control valve in the “R” range. And five ports 142 and 144.

The decompression line 146 connected from the third port 128 of the reducing valve 16 is connected to the first pressure control valve that reduces the transmission shock by adjusting the hydraulic pressure at the time of shifting.

The pressure regulating device according to the present invention is applied to the automatic transmission hydraulic control system as shown in FIG. 2, and is controlled by the transmission control unit (TCU) according to the opening degree and the vehicle speed of the throttle valve. The shifting is effected by the valves.

That is, when the engine starts to drive, the torque converter 2 drives together and rotates the input shaft of the transmission. At this time, the oil pump 4 starts to generate and discharge oil pressure.

Part of the oil pressure generated at this time flows along the line pressure line 58 to the pressure regulating valve 10, the torque converter control valve 8, and the damper clutch control valve 6, and a part of the reducing valve 16. And a manual valve 14.

The hydraulic pressure flowing to the pressure regulating valve 10 is supplied to the torque converter control valve 8 and the damper clutch control valve 6 by adjusting the pressure, and the hydraulic pressure supplied to the reducing valve 16 is lower than the line pressure. Hydraulic pressure is reduced and supplied to the damper clutch control valve 6 and the high-low pressure valve 12, the first and second pressure control valves 150, 152 and the NR control valve 154.

In this state, when the shift lever is switched to the "D" range, the manual valve 14 controls the shift control valve 118 and the first and second pressure control via the drive pressure line 78 and the reverse pressure line 80 in conjunction with this. Hydraulic pressure is supplied to the valves 150 and 152, respectively.

In addition, the shift control valve 118 is a second, third and fourth speed conduits 162 and 164 by first and second shift control solenoid valves S2 and S3 controlled by a transformer control unit (TCU). The hydraulic pressure is supplied to the rear clutch release valve 160, the 2-3 / 4-3 shift valve 168, the 1-2 shift valve 170, and the end clutch valve 172 through 166.

In addition, the hydraulic pressure supplied to the rear clutch release valve 160, the 2-3 / 4-3 shift valve 168, the 1-2 shift valve 170, and the end clutch valve 172 may be the first and second hydraulic pressures. 1, 2, 3, 4, 5 to operate with the hydraulic pressure supplied from the first and second hydraulic control valves 150 and 152 controlled by the control solenoid valves S4 and S5. By shifting the drive pressure to the friction elements 178, 180, 182, 184, and 186, the shift is made.

In such a hydraulic control system, the process of adjusting the line pressure of the pressure regulating device, in the "D", "N", "2", and "L" ranges, is performed in the manual of the oil pump 4 as shown in FIG. The hydraulic pressure supplied to the valve 14 supplies the hydraulic pressure to the line pressure line 78 which links the second port 82 of the pressure regulating valve 10 through the third port 140.

Then, its hydraulic pressure acts on the sixth land 106 through the second port 82 of the pressure regulating valve 10 to operate the valve spool 74 to adjust the line pressure.

In the "R" range, the hydraulic pressure supplied from the oil pump 4 to the manual valve 14 is supplied to the reverse pressure pipeline 80 through the fourth port 142, so that the third port ( 84 acts on the right side of the fifth land 104 of the valve spool 74 to operate the valve spool 74 to adjust the line pressure.

In addition, in the 3rd and 4th speeds of the "D" range, the hydraulic pressure is supplied to the fourth friction element 184 through the end clutch valve 172 to operate, wherein the third port of the high-low control valve 12 ( 114 is connected to the fourth friction element 184 as the conduit 112, and the third port 114 is in a state where the hydraulic pressure is waited at the third and fourth speeds.

In this state, when the damper clutch control solenoid valve S1 is duty controlled by the transmission control unit (TCU) control and the duty is 50 to 85%, the damper clutch control solenoid valve S1 and the high-low pressure valve 12 are controlled. ), The hydraulic pressure of the pipe to communicate is lowered.

Then, as shown in FIG. 3, the valve spool 116 of the high-low pressure valve 12 is pushed to the left side by the spring force of the spring 122 while communicating with the third port 114 and the second port 110. Let's go.

As such, when the second and third ports 110 and 114 of the high-low pressure valve 12 communicate with each other, the hydraulic pressure supplied to the conduit 112 is transferred to the pressure control valve 10 and the high-low pressure valve 12. Is supplied to the sixth port 92 of the pressure regulating valve 10 through the conduit 90 connected to the right side of the fourth land 102 of the valve spool 74 to operate the valve spool 74. To adjust the line pressure.

At this time, the damper clutch is controlled at the same time according to the operation of the damper clutch control solenoid valve (S1).

As described above, according to the present invention, by using the existing damper clutch control solenoid valve, the line pressure can be reduced even at high speed in the "D" range 3 or 4 speed, thereby reducing the load of the oil pump to reduce fuel economy. It is an invention that can be greatly reduced.

Claims (3)

In the hydraulic control system of an automatic transmission comprising a plurality of valves for selectively transmitting the torque of the torque converter to the respective gear elements by controlling a plurality of friction elements in proportion to the forward and subsequent speed by the hydraulic pressure generated in the oil pump A damper clutch control valve for operating / deactivating the damper clutch of the torque converter by varying the hydraulic pressure generated in the oil pump; A torque converter control valve for constantly adjusting the torque converter pressure; A pressure regulating valve for varying the line pressure during mode switching to the "N" range and the "D" range or the "R" range; A high-low pressure valve controlled by the damper clutch solenoid valve and adjusting the line pressure of the pressure regulating valve by hydraulic pressure supplied from an end clutch; A hydraulic control device for a four-speed automatic transmission hydraulic control system for a vehicle, which is connected to a manual valve linked by the shift lever and includes a reducing valve which produces a constant pressure lower than a line pressure. The pressure regulating valve according to claim 1, wherein the pressure regulating valve is in communication with a first port for preventing negative pressure, a second port for supplying hydraulic pressure to the torque converter, a third port for supplying minimal lubricating hydraulic pressure to the torque converter, and a pump inlet side. A valve body comprising four ports, a fifth port for preventing negative pressure, a sixth port for communicating with a high-low pressure valve, a seventh port for communicating with a reverse pressure pipeline, and an eighth port for communicating a line pressure with a pipeline; ; A spring which is supported by a spring, selectively disconnects the second port, a second land allowing the discharge of the line pressure according to the left side movement of the valve spool, and a material separating the pilot pressure from the pump suction pressure. And a third land, a fourth land serving as a working surface of the hydraulic pressure flowing into the sixth port, and a fifth land and sixth land serving as a working surface of the hydraulic pressure flowing into the seventh and eighth ports. 4-speed automatic transmission hydraulic control system for automobiles consisting of valve spools. The high-low pressure valve of claim 1, wherein the high-low pressure valve has a first port formed at one side thereof to communicate with the damper clutch control solenoid valve, and a second port connected to the pressure regulating valve at the other side thereof, and a conduit of the end clutch valve. A valve body having a third port communicating therewith; A first land for opening and closing the third port, and a second land for selectively opening and closing the discharge passage, the hydraulic control of the hydraulic control system for a four-speed automatic transmission for automobiles, the spring is carried between the second land and the valve body Device.