KR20000055785A - Manual valve of hydraulic control system for automatic transmission - Google Patents

Abstract

PURPOSE: A manual valve of a hydraulic control system of an automatic transmission for a car is provided to prevent the damage of a friction element and a lowering of oscillation performance, and to gauge the quantity of oil of a transmission in "P" range by supplying hydraulic pressure with controlling line-pressure in "P" or "N" range for making sufficiently lubricating hydraulic pressure. CONSTITUTION: A manual valve of a hydraulic control system of an automatic transmission for a car comprises : a valve body to include the first port(100) connected with a line-pressure pipe, the second port(102) of "P" or "N" range, the third port(104) of "D" range, and the first and the second discharge ports(EX1, EX2) ; a valve spool(110) to convert the ports, and to include a connect port(112), the first land(114) located on between the second port(102) and the third port(104) in "P" range, the second land(116) connecting the first port(100) with the second port(102) in "P" range, and the third land(118) connecting the first port(100) with the fourth port(106) in "R" range. And the third port(104) is the size accommodating "D", "2", and "L" ranges, and its opening area is controlled by a separating plate. Also all diameters of the lands are equal.

Description

MANUAL VALVE OF HYDRAULIC CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION}

The present invention relates to a manual valve of an automatic transmission hydraulic control system for a vehicle. More specifically, the hydraulic pressure is supplied so that the line pressure is controlled in the "P" range so that the transmission oil amount can be measured even in the "P" range. In addition, the present invention relates to a manual valve of a hydraulic control system that can prevent breakage of friction elements due to lack of lubrication at extreme low temperatures.

For example, referring to an example of a hydraulic control system of an automatic transmission applied to a vehicle, as shown in FIG. 1, a solenoid controlled by a transmission control unit (TCU) according to an opening degree and a vehicle speed of a throttle valve is acted on / off or duty. 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 6 to the pressure regulating valve 8, the torque converter control valve 10, and the damper clutch control valve 12, and part of the reducing valve 14. And a manual valve 16.

The hydraulic pressure flowing to the pressure regulating valve (8) in the above is adjusted to the pressure is supplied to the torque converter control valve 10 and the damper clutch control valve 12, the hydraulic pressure supplied to the reducing valve 14 is lower than the line pressure The pressure is reduced by hydraulic pressure and supplied to the damper clutch control valve 12, the pressure control valve 18, and the NR control valve 20.

In this state, when the shift lever is switched to the "D" range, the manual valve 16 supplies hydraulic pressure to the ND control valve 24 and the shift control valve 26 through the drive pressure line 22, respectively. .

Then, the shift control valve 26 is connected to the second, third, fourth, speed pipes 28 and 30 by the first and second shift control solenoid valves S1 and S2 controlled by the transmission control unit TCU. (32) supplies hydraulic pressure to the 1-2 shift valve 34 and the end clutch valve 36, the 2-3 / 4-3 shift valve 38 and the rear clutch release valve 40, respectively. .

In addition, the hydraulic pressure supplied to each of the 1-2 shift valve 34 and the end clutch valve 36, the 2-3 / 4-3 shift valve 38, and the rear clutch release valve 40 is controlled by pressure. It operates together with the hydraulic pressure supplied from the pressure control valve 18 controlled by the solenoid valve S3, so that the first, second, third, fourth, friction elements C1, C2, C3, and C3 are adapted to each shift stage. ) And (C4) by supplying the drive pressure, the shift is made.

And the fifth friction element (C5) to operate at the time of reverse operation is supplied by receiving the hydraulic pressure supplied from the manual valve 16 through the 2-3 / 4-3 shift valve (38).

The manual valve in the hydraulic control system of the automatic transmission is supplied with hydraulic pressure from the "D" range to the drive pressure line while the port is shifted in conjunction with the selector lever operated by the driver, and the reverse pressure line from the "R" range. To supply hydraulic pressure.

Looking at the conventional configuration of such a manual valve, as shown in Figure 9 (A), the valve body is the first port 200 to receive hydraulic pressure from the oil pump, and "D", "2", "L" range A second port 202 for supplying hydraulic pressure to a shift control valve (not shown) and a third port 204 for supplying hydraulic pressure to a pressure control valve in the "N", "D", "2", and "L" ranges. And a fourth port 206 for supplying hydraulic pressure to the pressure regulating valve and the NR control valve in the "R" range.

In addition, the valve spool 210 interlocked with the select lever has a connector portion 212 on one side, and is located between the second and third ports 202 and 204 only in the "P" range on the other side and the second in other ranges. The first port 214 located to one side of the port 202 and the third port 204 or the second and third ports 202 and 204 in the range except the "P" "R" range are the first ports. A second land 216 communicating with the 200 and a third land 218 communicating with the first port 200 and the fourth port 206 in the "R" range.

In addition, a discharge hole 222 communicating with the discharge path 220 formed from the connector 212 side is formed between the first and second lands 214 and 216.

Accordingly, the hydraulic pressure of the first port 200 is supplied to the third port 204 in the "N" range as shown in FIG. 9A, and in the "D" range as shown in (B) of the first port 200. Hydraulic pressure is simultaneously supplied to the second and third ports 202 and 204, and in the "R" range such as (C), the hydraulic pressure of the first port 200 is supplied to the fourth port 206, and (D) In the "P" range, such as the hydraulic pressure of the first port 200 is released along the discharge hole 222 and the discharge path 220.

However, in the manual valve as described above, since the hydraulic pressure supplied from the oil pump in the "P" range is configured to be discharged through the valve spool, it is impossible to control the pressure regulating valve, so that a small amount of hydraulic pressure is applied to the torque converter through the orifice. Only is supplied.

Accordingly, there is a problem that the rapid oscillation performance is not good due to the lack of hydraulic pressure, as well as the breakage of the friction element as well as the delay of the hydraulic supply to the friction element during rapid start.

And when the oil is not supplied to each part in the "P" range, the amount of oil can not be measured, there is a problem that can not measure the exact amount.

Accordingly, the present invention has been invented to solve the conventional problems as described above, the object of the present invention is to ensure that the hydraulic pressure is supplied while the line pressure control is made in the "P" range to prevent breakage of friction elements and deterioration of oscillation performance The manual valve of the hydraulic control system can measure the transmission oil level even in the "P" range.

1 is a schematic configuration diagram of a hydraulic control system to which the present invention is applied.

2 is a "N" range state diagram of a manual valve according to a first embodiment of the present invention.

3 is a "P" range state diagram of a manual valve according to the first embodiment of the present invention.

4 is an "R" range state diagram of a manual valve according to a first embodiment of the present invention.

5 is a "D" range state diagram of a manual valve according to the first embodiment of the present invention.

6 is a "2" range state diagram of a manual valve according to the first embodiment of the present invention.

7 is an "L" range state diagram of a manual valve according to the first embodiment of the present invention.

8 is a "N" range state diagram of a manual valve according to a second embodiment of the present invention.

9 is a cross-sectional view of a conventional manual valve,

(A) is an "N" range state cross section.

(B) is a "D" range state cross section.

(C) is the "R" range state cross section.

(D) is a sectional view of the "P" range state.

In order to realize the above object, the present invention is applied to a hydraulic control system of an automatic transmission for a vehicle in the manual valve in which the port conversion is made in conjunction with the driver's select lever operation,

A second port of "P" and "N" range ports and a third port of "D" range ports are formed on one side of the first port where the line pressure flows, and the fourth port of the "R" range port on the other side. And a valve body in which the first and second discharge ports are sequentially formed.

With a connecting portion on one side, a first land located between the second port and the third port in the "P" range and a first port and the second port are communicated with the first land in the "P" range. And a valve spool having a second land, and a third land communicating the first port and the fourth port with the second land in the "R" range.

The third port of the valve body is sized to accommodate all the "D", "2", "L" range, the opening area can be adjusted by the separating plate, the valve spool Lands 1, 2 and 3 provide manual valves for an automatic transmission hydraulic control system for a vehicle, characterized by the same diameter.

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

2 is a cross-sectional view of the "N" range state of the manual valve according to the first embodiment of the present invention. The manual valve 22 is formed of a valve body and a valve spool as in the prior art.

The valve body is formed in the vicinity of the first port 100 and the first port 100 connected to the line pressure line 6, the hydraulic pressure to the pressure control valve (8) in the "N", "P" range Control of the hydraulic pressure supplied to the first port 100 in the "D", "2", and "L" ranges formed in the neighborhood of the second port 102 and the second port 102, The third port 104 is supplied to the means.

And a fourth port 106 formed on the opposite side of the second port 102 at a predetermined interval from the first port 100 to supply the hydraulic pressure supplied to the first port 100 in the “R” range. And a first discharge port EX1 disposed in the neighborhood of the fourth port 106 and discharging the hydraulic pressure supplied to the fourth port 106, and disposed in the neighborhood of the first discharge port EX1 and "N". The second discharge port EX2 communicates with the fourth port 106 and the first discharge port EX1 in the "," D ", 2", and "L" ranges.

In addition, the third port 104 is made of a size that can accommodate all the "D", "2", "L" range, the opening area can be adjusted by the separating plate 108 It is configured to be.

The valve spool 110, which is built in the valve body as described above and converts the port, has a connecting portion 112 formed at one side, and is located between the second port 102 and the third port 104 in the "P" range. A first land 114 located therein, a second land 116 communicating with the first port 100 and the second port 102 together with the first land 114 in the “P” range, and “R”; &Quot; a third land 118 communicating with the first port 100 and the fourth port 106 together with the second land 116 in the range, wherein the first, second and third lands 114 ( 116) 118 are of the same diameter.

According to the manual valve 16 of the present invention as described above, in the "N" range, as shown in FIG. 2, the hydraulic pressure of the first port 100 is changed to the second port 102 by the second and third lands 116 and 118. Is supplied to the pressure regulating valve (8) to vary the line pressure. In the "P" range, the hydraulic pressure of the first port 100 is applied to the first and second lands 114 and 116 as shown in FIG. Is supplied to the second port 102 to vary the line pressure as in the " N " range.

As such, varying the line pressure results in a sufficient supply of lubricating hydraulic pressure, thereby solving the problems caused by the application of a conventional manual valve.

In the "R" range, as shown in FIG. 4, the hydraulic pressure of the first port 100 is supplied to the fourth port 106 by the second and third lands 116 and 118 so that the reverse shift is performed. In the D " and " 2 " ranges, as shown in FIGS. 5 and 6, the hydraulic pressure of the first port 100 is transferred to the second and third ports 102 and 104 by the first and third lands 114 and 1118. In the "L" range, as shown in FIG. 7, the hydraulic pressure of the first port 100 is transferred to the second and third ports 102 and 104 by the second land 116 and the third land 118. Supplied.

According to the manual valve 16 for converting the flow path as described above, by supplying the hydraulic pressure supplied from the oil pump to the pressure regulating valve 8 in the same manner as the "N" range in the "P" range, the line pressure is varied. Line pressure is supplied to the torque converter 2.

Accordingly, it is possible to prevent the breakage of the friction element by supplying sufficient hydraulic pressure, it is possible to improve the oscillation performance during rapid start.

In addition, it is possible to perform the measurement of the amount of oil, which was conventionally performed only in the "N" range in the "P" range, thereby providing convenience for measuring the amount of oil.

8 shows the manual valve 16 of the second embodiment according to the present invention, in which the manual valve 16 of the second embodiment is made identical to the manual valve of the first embodiment, In forming, the portion 120 except for the opening is formed to be in contact with the first land 114 in all regions except for the "P" range.

Accordingly, since the second embodiment converts the hydraulic pressure in the same manner as the first embodiment, detailed operation description will be omitted.

As described above, according to the present invention, the hydraulic pressure is supplied while the line pressure is controlled in the "P" and "N" ranges, thereby preventing friction element damage and deterioration in oscillation performance by sufficient lubricating hydraulic pressure, and the "P" range. Is also an invention that can measure the transmission oil amount.

Claims (3)

In the manual valve that is applied to the hydraulic control system of the automatic transmission for the vehicle is connected to the driver's select lever operation, port conversion is performed, A second port of "P" and "N" range ports and a third port of "D" range ports are formed on one side of the first port where the line pressure flows, and the fourth port of the "R" range port on the other side. And a valve body in which the first and second discharge ports are sequentially formed. With a connecting portion on one side, a first land located between the second port and the third port in the "P" range and a first port and the second port are communicated with the first land in the "P" range. And a valve spool having a second land, and a third land communicating the first port and the fourth port with the second land in the "R" range. The third port of the valve body is sized to accommodate all the "D", "2", "L" range, the opening area can be adjusted by the separating plate, the valve spool Manual valve of the automatic transmission hydraulic control system for a vehicle, characterized in that the lands 1, 2 and 3 have the same diameter. 3. The manual valve of claim 1, wherein the third port of the valve body is formed so that the portion except for the opening is in contact with the first land in all regions except for the “P range”. The manual valve of claim 1, wherein the hydraulic pressure through the first port in the “L” range is configured to be discharged to the second and third ports by the first and second lands.