JPH059659B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve of a hydraulic control device provided in an automatic transmission for a vehicle.

[Prior Art] FIG. 2 shows a throttle valve of a conventional hydraulic control device as disclosed in Japanese Utility Model Application Publication No. 59-1971.

The throttle valve of this hydraulic control device has a bubble spool 103 slidably fitted into a valve hole 102 provided in a valve body 101, and a keep plate insertion groove 104 formed to intersect with the valve hole 102 from the side. The land of the valve spool 103 is locked to the keep plate 105 to restrict the movement of the valve spool 103, thereby constantly blocking the drain port of the valve and preventing oil from flowing out from the drain port. This eliminates discharge and prevents cutting debris from getting caught between the valve drain port and the land of the valve spool 103, thereby preventing the valve spool 103 from sticking, and reducing the displacement of the valve spool 103. By reducing the flow rate change, the valve spool 10
3 is configured to prevent hunting.

[Problems to be Solved by the Invention] However, in the throttle valve of the conventional hydraulic control device as shown in FIG. A separate plate 106 that vibrates and is fastened to the valve body 101
The gasket 10 interposed between the separate plate 106 and the valve body 101 interferes with the valve body 101.
Damage occurred to 7.

Also, since the keep plate 105 is only inserted into the groove, it is not necessary to turn the valve body 101 upside down or to attach the valve body 101 for assembly.
Keep plate 10 when shaking 1.
5 may fall out of the groove, and furthermore, the keep plate 105 is small and difficult to assemble to the valve body 101.

SUMMARY OF THE INVENTION An object of the present invention is to provide a throttle valve for a hydraulic control device that can prevent gasket damage and improve the ease of assembling a valve body assembly.

[Means for Solving the Problems] The throttle valve of the hydraulic control device of the present invention includes a line pressure oil port A communicating with a line pressure generation oil passage;
A valve chamber 6 having a throttle pressure generating oil port B that can communicate with the line oil pressure port, a throttle pressure feedback oil port C that receives feedback of the throttle pressure when the throttle pressure is generated, and a drain port D.
a plunger 7 provided on one side of the valve chamber and applying a spring load to a spring 7a arranged in accordance with the opening degree of the throttle pedal; a plunger 7 connected in series with the plunger via the spring; In a throttle valve of a hydraulic control device comprising a spool 8 which generates the throttle pressure in response to the feedback of a spring load and throttle pressure, an outlet 9a having a throttle 10 is provided in the oil passage communicating with the throttle pressure generating oil port B. In addition, a sleeve 6A into which the plunger 7 is loosely fitted is provided in the valve chamber 6, and the sleeve 6A has an inner diameter 6b on the side facing the spool 8 and an outer diameter on the side of the spool 8 facing the plunger 7. 8b, and the spool 8 is characterized in that it has a land 8e that closes the drain port D even when one end of the spool comes into contact with the sleeve 6A.

[Operation and Effects of the Invention] In the throttle valve of the hydraulic control device of the present invention, a cam rotates via a cable connected to the throttle pedal, and the rotation of the cam presses the plunger, and the spring load of the spring is Increased. Line pressure (PL) acts on the oil port A of the valve chamber of the throttle valve of the hydraulic control device, and the throttle pressure (Pth)
is oil port B, and the feedback pressure of the throttle pressure (Pth) acts on oil port C, which generates throttle pressure (Pth) by receiving the throttle pressure (Pth) acting on oil port C and the spring load linked to the throttle pedal. .

The inner diameter of the sleeve on the side facing the spool is smaller than the outer diameter on the side of the spool facing the plunger, and serves as a stopper when the spool moves toward the sleeve. Even when one end of the spool comes into contact with the sleeve, the drain port D is closed by the land.
No contact is made with Aburakuchi A, B, and C.

According to the present invention, the conventional type uses a keep plate attached from the outside of the valve body in a groove provided in a direction crossing the valve chamber to restrict movement of the spool and constantly close the drain port with a land. Compared to the throttle valve of
In the throttle valve of the present invention, a sleeve provided to restrict the movement of the spool is provided so that the plunger is loosely fitted in the valve chamber, and the sleeve is inserted in a direction transverse to the valve chamber when the valve is operated. Since the sleeve does not vibrate, the sleeve does not interfere with the gasket and separate plate that are fastened to the lower surface of the valve body.
Damage to the gasket can be prevented.

Moreover, since the sleeve does not fall off from the valve body even if it is turned upside down or shaken when assembling the valve body, it is possible to improve the ease of assembling the valve body assembly.

[Embodiment] Next, a throttle valve of a hydraulic control device of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 shows a throttle valve of a hydraulic control system according to the present invention.

The throttle valve 1 of the hydraulic control device has a valve chamber 6.
and a sleeve 6A provided in the valve chamber 6.
, a plunger fitted loosely and slidably into the sleeve 6A, and a spool 8 fitted loosely and slidably into the valve chamber 6.

The valve chamber 6 includes a line pressure oil port A that communicates with the line pressure generation oil passage 2, a throttle pressure generation port B that can communicate with the line pressure oil port A, and a throttle pressure generation port B that can communicate with the line pressure generation oil path 2. ) is formed so as to be received by the throttle pressure feedback oil port C at the lower part of the figure, which is formed so as to be received by the upper end land 8f of the spool 8 via the throttle 4, by the drain port D, and by the lower end land 7e of the plunger 7. The oil port E for the throttle pressure (Pth) at the top of the diagram, and the oil port F connected to the oil port E.
and a feedback oil port G for throttle pressure (Pth) connected from the oil port F via an oil passage 9A.

The plunger 7 is provided on one side 6a of the valve chamber 6, and is pressed by the rotation of a cam 7b via a cable connected to a throttle pedal (not shown), and a spring 7a disposed corresponding to the opening degree of the throttle pedal. It has an upper end land 7c, an intermediate land 7d, and a lower end land 7e.

The spool 8 is provided on the other side 6c of the valve chamber 6, is connected in series with the plunger 7 via a spring 7a, and generates throttle pressure by receiving the spring load of the spring 7a and the feedback of the throttle pressure. , the annular land 8e at the top of the diagram
It has an upper land 8f, an intermediate land 8d, and a lower land 8g, and the lower land 8g is provided with a spring 8h.

The inner diameter 6b of the sleeve 6A is smaller than the outer diameter 8b of the land 8e of the spool 8, and even when the annular land 8e provided on one end 8a of the spool 8 abuts the end surface 6h of the sleeve 6A, it remains circular. The other side 8i of the annular land 8e is provided so as to overlap the wall portion 6B and always close the drain port D, and the oil passage 6e connects the oil port E and the oil chamber 6d, and the oil path 6e connects the oil port F and the oil chamber 6f. An oil passage 6g is formed between the valve chamber 6 and the wall 6B.

And the throttle valve 1 of the hydraulic control device of the present invention
The cam 7b rotates via a cable connected to the throttle pedal, and the rotation of the cam 7b presses the plunger 7, increasing the spring load of the spring 7a. Throttle valve 1 of hydraulic control device
Line pressure (PL) acts on oil port A of valve chamber 6, throttle pressure (Pth) acts on oil port B, and feedback pressure of throttle pressure (Pth) acts on oil port C and oil port G. Throttle pressure (Pth) is generated by receiving the throttle pressure (Pth) acting on C and oil port G and the spring load interlocked with the throttle pedal.

The sleeve 6A has an inner diameter 6 on the side facing the spool 8.
b is formed smaller than the outer shape 8b of the spool 8 on the side facing the plunger 7, and serves as a stopper when the spool 8 moves toward the sleeve 6A. Even when one end of the spool 8 comes into contact with the sleeve 6A, the drain port D is closed by the land 8e, and the oil ports A, B,
It has been decided that there will be no contact with C.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a throttle valve of a hydraulic control device of the present invention, and FIG. 2 is a diagram showing a throttle valve of a conventional hydraulic control device. In the figure, 1... Throttle valve of the hydraulic control device, 6
...Valve chamber, 6A...Sleeve, 7...Plunger, 8...Spool.

Claims (1)

[Claims] 1. A line pressure oil port communicating with a line pressure generation oil passage;
a valve chamber having a throttle pressure generating oil port that can communicate with the line pressure oil port, a throttle pressure feedback oil port that receives feedback of the throttle pressure when the throttle pressure is generated, and a drain port; a plunger that applies a spring load to a spring arranged in accordance with the opening degree of the throttle pedal; and a plunger that is connected in series with the plunger via a front spring and receives feedback of the spring load and throttle pressure to adjust the throttle pressure. A throttle valve for a hydraulic control device comprising a spool for generating throttle pressure, the oil passage communicating with the throttle pressure generating oil port being provided with a discharge port having a restriction, and a sleeve for loosely fitting the plunger in the valve chamber; The sleeve has an inner diameter on a side facing the spool smaller than an outer diameter on a side of the spool facing the plunger, and the spool closes the drain port even when one end of the spool contacts the sleeve. A throttle valve for a hydraulic control device characterized by having a land.