JP2899622B2 - Manual valve for automatic transmission - Google Patents

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 of an automatic transmission mounted on a vehicle.

[0002]

2. Description of the Related Art A manual valve disposed in a hydraulic control device of an automatic transmission is switched by remote control of a shift lever provided in a driver's seat to control supply and discharge of hydraulic pressure in a valve body. Although, conventionally,
This manual valve is a spool valve, and a spool is slidably disposed in a valve hole formed in a valve body. The spool is provided with three lands, and the valve hole is provided with a line pressure import communicating therewith and supplying hydraulic pressure into the valve hole. Drive port, second port, low port, etc.), a reverse port for reverse is formed on the opposite side, and a drain port is formed on the outermost side.One end of the valve hole is closed with a plug, and the other end Is configured to be closed by an outer end land which is one of the lands.

In this manual valve, each forward port and each reverse port are disposed axially on both sides of the line pressure import, and the spool lands also sandwich the central land for switching the line pressure import. However, since both ends are provided with lands for closing the ends of the valve holes, there is a problem that the axial length of the valve body, the spool length, and the valve stroke are also long.

[0004] In order to solve such problems, it has been proposed to arrange a forward port and a reverse port on one side of the line pressure import to shorten the valve body length (for example, Japanese Patent Laid-Open Publication No. H11-163873). In this manual valve, both ends of the valve hole are further opened so that the valve can be drained directly from the hole.

[0005]

In the proposed manual valve, the valve body can be shortened. On the other hand, as for the spool, lands are formed at both ends with the center land for switching the line pressure import therebetween. Since the forward and backward oil chambers must be defined between the land and the lands at both ends, the length and the stroke cannot be shortened as compared with the conventional one. have.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a manual valve for an automatic transmission which can solve both of the above problems and can reduce 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 forward ports, a reverse port, and a line pressure import, and communicates and shuts off each of the ports. The forward port and the reverse port are axially on both sides of the line pressure import and the reverse port is the forward port. The spool is provided closer to the line pressure import than the port farthest from the line pressure import, and the spool is provided with a land, and the axial pressure slides the line pressure import into the valve hole. A first oil chamber communicating with at least one of the forward ports and a second oil chamber communicating the line pressure import with the reverse port are provided between a common land. 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 to guide re-fitting after the spool has slipped out of the valve hole due to sliding in the axial direction.

[0008]

In the manual valve of the present invention, by operating the shift lever in the driver's seat, the spool slides in the valve hole according to the amount of operation and takes a predetermined position. Each port for forward / reverse is switched to the line pressure import or drain.
In some cases, one land may be completely detached from the valve body at a certain position of the spool. However, when the spool is re-fitted by sliding to another position, the guide portion opposed to the valve hole is provided with the valve of the land. It serves as a guide for the fitting into the hole and acts to facilitate the re-fitting of the land.

Therefore, according to the present invention, the first oil chamber and the second oil chamber are both configured to be defined between the common lands to shorten the spool length and the stroke thereof, and to further reduce the length of the guide portion. By allowing the land to be re-fitted into the valve hole by the formation, the length of the valve body with respect to the stroke is set as short as possible, so that the space for disposing the manual valve can be extremely reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the accompanying drawings. FIG. 1 is an exploded perspective view showing the configuration of the manual valve, and in order to refer to the internal structure, the valve body is shown with its upper part cut away along its axis. As shown in FIG. 1, the manual valve MV has a plurality of forward ports formed sequentially from a line pressure import Lp formed substantially at the center thereof in a valve hole 10a of the valve body 10, that is, a drive port Dp. 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 ports are respectively provided with notches 12e, 1b provided on lands 12a, 12b of the spool 12, which will be described later.
Since it is configured to communicate with 2f, it is a grooved port as shown in the figure.

Each of the ports L is provided in the valve hole 10a.
An axially slidable spool 12 is provided to communicate and cut off p, Dp, 3p, 2p, 1p, and Rp.
The forward ports Dp, 3p, 2p, 1p and the reverse port Rp are disposed on both sides in the axial direction with the line pressure import Lp interposed therebetween, and the reverse port Rp is connected to the line within each forward port. 1 farthest from the pressure import Lp
It is disposed closer to the line pressure import Lp than the speed port 1p.

The spool 12 has notched lands 12a and 12b at both ends thereof, which are connected to each other via a rod portion 12c. Therefore, spool 1
Reference numeral 2 denotes a port Dp, 3p, 2p, 1 for moving the line pressure import Lp into the valve hole 10a by sliding in the axial direction.
A first oil chamber (indicated by reference numeral 13A in FIG. 3), and a second oil chamber (indicated by reference numeral 13B in FIG. 5), which communicates the line pressure import Lp with the reverse port Rp.
Are defined by the common lands 12a and 12b, and the line pressure import Lp is shut off, and the forward ports Dp, 3p, 2p and 1p and the reverse port Rp are drained through both ends of the valve hole 10a. (Indicated by the symbol EX in FIG. 2 described later).

Such a configuration in which the first oil chamber 13A and the second oil chamber 13B are both defined between the common lands has the effect of shortening the spool length, and has the effect of reducing the length of the spool. Ports Dp, 3p, 2p, 1p and reverse port R
p through the openings at both ends of the valve hole 10a.
Combined with the configuration in which the reverse port Rp is disposed closer to the line pressure import Lp than the first speed port 1p, the valve body 10 can be shortened.

The land 12a of the spool 12 is formed with a guide portion 12g opposed to the valve hole 10a for guiding re-fitting after the spool 12 slides in the axial direction and comes out of the valve hole 10a. In this example, the guide unit 1
2g is notched on both sides of the outer peripheral portion of the cylinder,
e is configured to form a communication passage when the second oil chamber 13B is defined. The rod 12 sandwiching the land 12a
On the side opposite to c, a shaft portion 12d connected to the shift lever via an operation mechanism is provided continuously.

FIG. 2 shows a state in which 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 the ports Rp are controlled by the lands 12a and 12b. , D
p, 3p, 2p, 1p are all line pressure imported Lp
, And all are drained through openings at both ends of the valve hole 10a.

Next, when the spool 12 is at the drive position, as shown in FIG. 3, the reverse port Rp and the ports 3p, 2p, and 1p of the forward ports are drained, and the line pressure import Lp is changed to the second port. It communicates with the drive port Dp via the first oil chamber 13A. Hereinafter, as the spool 12 slides, 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 is moved forward through the oil chamber 13A. Communicate with all ports Dp, 3p, 2p, 1p.

Next, when the shift lever is switched from the neutral position to the reverse position, as shown in FIG. 5, the spool 12 moves in a direction to come out of the valve hole 10a in reverse to the forward movement, and the line pressure import Lp is reduced. A second oil chamber 13B communicating with the reverse port Rp is defined, and all the forward ports are drained at this time.

In the parking position, the spool 12 further comes out, and as shown in FIG.
a jumps out of the valve body 10 and is completely separated from the valve hole 10a. In this position, the line pressure import Lp is blocked by the land 12b and all other ports Rp, Dp, 3p, 2p, 1p are drained. 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 manner, in the above-mentioned two conventional manual valves, even if one of the lands comes out of the valve body, two or more lands exist in the valve hole. There is no problem in re-fitting because it is left, but in this example,
Since the spool 12 is cantilevered by the land 12b at the parking position, smooth refitting cannot be expected.

Therefore, in the above embodiment according to the present invention, a guide portion 12g which stops in the valve hole 10a when the land 12a comes off is connected to the land 12a. Moreover, in this embodiment, a 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
Chamfered part 1 on the end face on the side receiving land part 12a
A chamfered portion 10m corresponding to 2m is formed to further facilitate refitting.

As described above, the present invention has been described based on one embodiment. However, the present invention is not limited to only the above-described embodiment, and various concrete configurations are possible within the technical scope described in the claims. Needless to say, it can be changed and implemented.
For example, the number of forward 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 the drawings]

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

FIG. 2 is a sectional view showing a state where a spool is in a neutral position.

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

FIG. 4 is a sectional view showing a state where the spool is at a first speed position.

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

FIG. 6 is a sectional view showing a state where the spool is at a parking position.

[Explanation of symbols]

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

Continuation of the front page (56) References JP-A-60-78144 (JP, A) JP-A-60-205054 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 59 / 00-61/12 F16H 61/16-61/36 F16H 63/00-63/48

Claims (1)

(57) [Claims] 1. A valve hole having a plurality of forward ports, a reverse port, and a line pressure import, and a spool slidable in the valve hole in the axial direction to communicate and shut off each of the ports. The forward port and the reverse port are axially on both sides of the line pressure import, and the reverse port is the port farthest from the line pressure import among the forward ports. A first oil disposed proximate to the line pressure import, wherein the spool includes a land, the first oil for communicating the line pressure import to at least one of the forward ports in the valve hole by axial sliding thereof; And a second oil chamber communicating the line pressure import with the reverse port is defined between common lands, and the line pressure import is And shut off at least one of the drains to connect the forward ports and the reverse port to the drain through a valve hole.
A manual valve for an automatic transmission, wherein a guide portion facing the valve hole is formed to guide re-fitting after the spool has slipped out of the valve hole due to sliding in the axial direction.