JPH0560213A - Manual valve for automatic transmission - Google Patents

Abstract

PURPOSE:To shorten a spool length, stroke length and valve body length in a manual valve of an automatic transmission. CONSTITUTION:A line pressure inlet port Lp, respective ports Dp, 3p, 2p, 1p for forward movement, and a port Rp for backward movement can be communicated with each other between lands 12a, 12b of a spool 12. Both ends of a valve body are opened to allow a stroke as far as the land 12a comes out of the valve body, and in order to allow re-fitting thereafter a guide part 12g is formed for guiding the re-fitting of the land 12a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual valve provided in a hydraulic control device for an automatic transmission mounted on a vehicle.

[0002]

2. Description of the Related Art A manual valve provided in a hydraulic control device for an automatic transmission is switched by remote control of a shift lever provided in a driver's seat to control supply / discharge of hydraulic pressure in a valve body. However, conventionally,
This manual valve is a spool valve, and the spool is slidably arranged in a valve hole formed in the valve body. Three lands are formed on the spool, and the valve hole is provided with a line pressure import that communicates with the valve hole and supplies hydraulic pressure into the valve hole. Drive port, second port, low port, etc. are formed, a reverse port for reverse drive is formed on the opposite side, and a drain port is formed on the outermost side of them, and one end of the valve hole is closed with a plug and the other end side Is configured to be closed by an outer end land which is one of the lands.

In this manual valve, each port for forward movement and port for reverse movement are arranged on both sides in the axial direction across the line pressure import, and the land of the spool also sandwiches the central land for switching the line pressure import. However, since the lands for closing the ends of the valve holes are provided at both ends, there is a problem that the axial length of the valve body, the spool length, and the valve stroke become long.

In order to solve such a problem, it has been proposed to provide each port for forward movement and reverse port for reverse movement on one side of the line pressure import to shorten the valve body length (for example, a special feature). In this manual valve, both ends of the valve hole are further opened to allow direct drainage from the hole.

[0005]

In the proposed manual valve, while the valve body can be shortened, the spool is formed with lands at both ends with a central land for switching the line pressure import interposed therebetween. Since it is inevitable to define a forward oil chamber and a reverse oil chamber between the land and the lands at both ends, the length and stroke of the oil chamber cannot be shortened as compared with the conventional one. have.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and provide a manual valve for an automatic transmission capable of shortening the valve body length, spool length and stroke.

[0007]

In order to achieve the above object, the present invention provides a valve hole having a plurality of advancing ports, a reversing port, and a line pressure import, and connecting and blocking the respective ports. Therefore, it comprises a spool that is slidable in the valve hole in the axial direction. The forward-moving ports and the reverse-moving ports are on both sides in the axial direction across the line pressure import, and the backward-moving ports are the forward-moving ports. Located closer to the line pressure import than the furthest one of the ports from the line pressure import, the spool comprises lands, the axial sliding of which causes the line pressure import to be in the valve bore. Between a common land, a first oil chamber that communicates with at least one of the forward ports and a second oil chamber that communicates the line pressure import with the reverse port With a constant, at least each port and the reverse port for the forward to cut off one at the line pressure import the lands communicates with the drain through the valve hole, one land of said spool,
A guide portion facing the valve hole is formed so as to guide the re-insertion after the spool is slid in the axial direction and is removed from the valve hole.

[0008]

In the manual valve of the present invention described above, when the shift lever is operated in the driver's seat, the spool slides in the valve hole in accordance with the operation amount of the shift lever to take a predetermined position. Each port for forward / reverse is switched and communicated with line pressure import or drain.
There is a case where one land is completely detached from the valve body at a certain position of the spool. However, when the spool is re-inserted by sliding to another position, the guide portion facing the valve hole has a valve portion of the land. It serves as a guide for the insertion into the hole and facilitates the re-insertion of the land.

Therefore, according to the present invention, the first oil chamber and the second oil chamber are both defined between the common lands so that the spool length and the stroke thereof are shortened, and the guide portion Since the land can be re-fitted into the valve hole by forming the valve body, the valve body length with respect to the stroke is set to be as short as possible, so that the space for disposing the manual valve can be made extremely small.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the accompanying drawings. FIG. 1 is an exploded perspective view showing the structure of a manual valve, and the valve body is shown with its upper portion cut away along the axis thereof for reference to the internal structure thereof. As shown in FIG. 1, the manual valve MV has a plurality of advancing ports, that is, drive ports Dp, which are sequentially formed outward from a line pressure import Lp formed substantially in the center of the valve hole 10a of the valve body 10. 3rd speed port 3p, 2nd speed port 2p and 1st speed port 1p
And a reverse port Rp on the opposite side. In addition,
In this embodiment, the forward / reverse traveling ports are provided with notches 12e, 1 provided in lands 12a, 12b of the spool 12, which will be described later.
Since it is configured to communicate with 2f, it has a grooved port as illustrated.

Inside the valve hole 10a, each of the ports L
A spool 12 that is slidable in the axial direction is arranged to connect and disconnect p, Dp, 3p, 2p, 1p, and Rp.
The forward ports Dp, 3p, 2p, 1p and the reverse port Rp are arranged axially on both sides of the line pressure import Lp, and the reverse port Rp is a line of the forward ports. 1 farthest from pressure import Lp
It is arranged closer to the line pressure import Lp than the speed port 1p.

The spool 12 is provided with notched lands 12a and 12b at both ends thereof, which are connected to each other via a rod portion 12c. Therefore, spool 1
2 is a port for forward movement of the line pressure import Lp in the valve hole 10a by sliding in the axial direction Dp, 3p, 2p, 1
A first oil chamber (indicated by 13A in FIG. 3 below) communicating with p and a second oil chamber (indicated by 13B in FIG. 5 below) communicating the line pressure import Lp with the reverse travel port Rp.
Are defined by the common lands 12a and 12b, the line pressure import Lp is shut off, and the forward ports Dp, 3p, 2p, 1p and the reverse port Rp are drained through both end openings of the valve hole 10a. (Shown by EX in FIG. 2 below).

The structure in which both the first oil chamber 13A and the second oil chamber 13B are defined between the common lands has the effect of shortening the spool length, and the forward movements Ports Dp, 3p, 2p, 1p and reverse port R
p through drain opening EX through both ends of the valve hole 10a.
The configuration in which the reverse port Rp is communicated with the reverse transmission port Rp is effective in shortening the valve body 10 in combination with the configuration in which the reverse speed port Rp is disposed closer to the line pressure import Lp than the first speed port 1p.

The land 12a of the spool 12 is formed with a guide portion 12g facing the valve hole 10a so as to guide the re-insertion of the spool 12 from the valve hole 10a caused by the axial sliding of the spool 12. In this example, the guide unit 1
2g is notched on both sides of the outer peripheral portion of the cylinder, and the notch 12
e is configured to form a communication passage when the second oil chamber 13B is defined. The rod portion 12 that sandwiches the land 12a
A shaft portion 12d, which is connected to the shift lever via an operation mechanism, is continuously provided on the side opposite to c.

FIG. 2 shows the state where the spool 12 is in the neutral position. In this state, the line pressure is supplied to the oil chamber 13 via the line pressure import Lp, but each port Rp is provided by the land portions 12a and 12b. , D
Line pressure import Lp for p, 3p, 2p and 1p
And is drained through the openings at both ends of the valve hole 10a.

Next, when the spool 12 is in the drive position, as shown in FIG. 3, the reverse port Rp and the forward ports 3p, 2p, and 1p are drained, and the line pressure import Lp is set to the first position. It communicates with the drive port Dp via the first oil chamber 13A. Hereinafter, as the spool 12 slides in sequence, each forward port communicates with the line pressure import Lp, and in the first speed position, as shown in FIG. 4, the line pressure import Lp moves forward through the oil chamber 13A. To all ports Dp, 3p, 2p, 1p of

Now, when the shift lever is switched from the neutral position to the reverse position, the spool 12 moves in the direction of coming out of the valve hole 10a as shown in FIG. A second oil chamber 13B communicating with the reverse drive port Rp is defined, and at this time, all forward drive ports are drained.

At the parking position, the spool 12 further comes out, and as shown in FIG.
a projects from the valve body 10 and is completely detached from the valve hole 10a. At this position, the line pressure import Lp is blocked by the land 12b, and all the other ports Rp, Dp, 3p, 2p, 1p are drained. Then, when the shift lever is shifted from the parking position to another position, the land 12a is fitted into the valve hole 10a again.

By the way, when the land 12a is re-fitted into the valve hole 10a in this way, in the above-mentioned two conventional manual valves, even if one of the lands comes out of the valve body, two or more lands are left in the valve hole. Since it is left, there is no particular problem in re-inserting it, but in this example,
Since the spool 12 is cantilevered by the land 12b at the parking position, smooth re-fitting cannot be expected.

Therefore, in the above embodiment according to the present invention, the guide portion 12g, which stops in the valve hole 10a when the land 12a is pulled out, is connected to the land 12a. Moreover, in the present embodiment, the chamfered portion 12m is further provided on the end surface of the land portion 12a on the rod portion 12c side, and the valve hole 1
The chamfered portion 1 is provided on the end surface on the side that receives the land portion 12a of
A chamfered portion 10m corresponding to 2 m is formed to further facilitate re-insertion.

Although the present invention has been described based on the embodiment, the present invention is not limited to the above embodiment, and various concrete configurations can be made within the scope of the technical matters described in the claims. Needless to say, it can be implemented by changing it.
For example, the number of advancing ports and the shape of the guide portion 12g are arbitrary, and the shaft portion 12d may be connected to the land 12b.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a manual valve according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a spool is in a neutral position.

FIG. 3 is a cross-sectional view showing a state where a spool is in a drive position.

FIG. 4 is a cross-sectional view showing a state in which the spool is in the first speed position.

FIG. 5 is a cross-sectional view showing a state where the spool is in the reverse position.

FIG. 6 is a cross-sectional view showing a state where the spool is in the parking position.

[Explanation of symbols]

 Dp Drive port 3p 3rd speed port 2p 2nd speed port 1p 1st speed port Rp Reverse drive port Lp Line pressure import 10 Valve body 10a Valve hole 12 Spool 12a, 12b Land 12g Guide part

Claims (1)

[Claims] 1. A valve hole having a plurality of forward movement ports, a reverse movement port, and a line pressure import, and a spool slidable in the valve hole in the axial direction to communicate and block the respective ports. The forward-moving ports and the reverse-moving ports are on both sides in the axial direction with the line pressure import interposed therebetween, and the backward-moving ports are the farthest from the line pressure import among the forward-moving ports. A first oil disposed proximate to the line pressure import, the spool having a land, the axial sliding of which allows the line pressure import to communicate with at least one of the advancing ports within the valve bore. A chamber and a second oil chamber communicating the line pressure import with the reverse drive port between common lands, and the line pressure import with the run. The forward port and the reverse port are communicated with the drain through valve holes by blocking at least one of the ports, and one land of the spool is
A manual valve for an automatic transmission, characterized in that a guide portion facing the valve hole is formed to guide re-insertion after the spool is slid in the axial direction after the spool is slid out.