JPS63251678A - Solenoid valve - Google Patents

Abstract

PURPOSE:To prevent the generation of noise and to enable installation of an in-line piping, by a method wherein the surroundings of a fixed seat part is surrounded with a valve body, and a valve action occasioned by contact of a seat part with a seat is effected in a position deep approximately in the central part of a valve. CONSTITUTION:A fixed seat 12 securely press-fitted in the central stem of a body 11 is provided at its interior with a first oil passage 23 communicated with a first port 22 connected to a first oil chamber 21 formed between the fixed seat and a valve body 13 with which the fixed seat is surrounded. The cylindrical valve body 13 is disposed to the body 11 in a manner to be slidable over a cylinder slide part 12A of the fixed seat 12. The valve body 12 has an internally moving seat 13B, being capable of making contact with a fixed seat part 12B, and is provided at its interior with a second oil passage 26 communicated with a second port 25 connected to a second oil chamber 24 partitioned by a moving seat 13B.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a solenoid pulp suitable for fluid control such as hydraulic control of automobile and general vehicle transmissions, which require small size, light weight, and high-speed response.

(Prior art) Conventionally, poppet type glazed solenoid valves, in which the movable part receives fluid pressure, have been mainstream, but in recent years, in order to meet the demands for smaller size and higher response, for example,
No. 53, as shown in FIG. 3, employs a pressure balance system in which the movable part does not receive fluid pressure. Although this was an improvement over the previous poppet type, it was close to the inlet port (3C) and had a nine-conical valve seat (3b) that seated and separated from the valve body (4). Because the pressure oil is repeated, it is easy to generate noise, and when the pressure oil takes on a conical shape and flows out from the conical valve seat (3b),
It is difficult to form a uniform conical flow surface, and if the conical flow surface becomes uneven, lateral fluid force will be applied to the valve body (4), increasing the resistance of the sliding part and causing oil leakage. Since the inflow and outflow channels are completely reversed in direction by 90 degrees, it is necessary to cut a horizontal hole in the pulp body and create a communication path α9 space for the flow channel, which may hinder miniaturization and cost reduction. There was a turtle.

(Problems to be Solved by the Invention) The purpose of the present invention is to solve the problems of the conventional products.
To provide a small and inexpensive solenoid valve that can be used with low noise and high pressure and can be installed in-line.

C) Means for Solving the Problems The present invention solves the above-mentioned problems of the conventional products by providing the solenoid valve described in the claims.

(Embodiment) Next, an explanation will be given with reference to FIG. 1 showing a solenoid valve according to an embodiment of the present invention, and FIG. 2 showing an enlarged view of its main parts. (12B)
The first valve body Q3 is defined between the valve body Q3 and the surrounding valve body Q3.
It has a first oil passage β inside that communicates with the first port (A) leading to the oil chamber Ql+, and has a cylindrical sliding part (12A) between the first port (A) and the tip. The hollow cylindrical valve body a3 is disposed on the body α so as to be able to slide on the cylindrical sliding part (12A), and is always fixed by a spring bracket fixed to the body αυ via the movable iron core α4. It is pressed L'l-'4n toward the seat part (12B). The valve body (6) further includes a fixed seat portion (12B
), and a second port (c) communicating with a second oil chamber@, which has an inwardly movable seat portion (13B) that can come into contact with the first oil chamber gt+, and which is partitioned and closed off by the movable seat portion (13B) with respect to the first oil chamber gt+. It has a second oil passage inside that communicates with it. And a cylindrical sliding part (12A
) The outer diameter (d2) and the inner diameter of the seat portion (13B) are approximately the same. The valve body α3 is press-fitted into the movable iron core σ44 and is pressed toward the fixed seat 4 by the spring rod via the movable iron core α4, and moves when the movable iron core α4 is attracted by the renoid device 4 in the direction opposite to the spring. do. Smooth sliding can be obtained between the cylindrical sliding part (12A) and the sliding surface of the valve body U,
Moreover, the high pressure fluid in the first oil chamber Q is sealed. (5) is a sleeve, which is positioned by the body and becomes part of one magnetic path. (6) is a non-magnetic sleeve that protects the movable iron core (14) and positions the spacer αη.

(IIA) is a fixed magnetic core, which is a part of the body circle, is connected to the body (lLυ by caulking), accommodates a spring guard, and also serves as a stopper for the movable core CL41. α4 and fixed iron core (IIA
) to prevent adsorption. As seen in Figure 2, the valve body (13
Inner periphery large diameter part (13A) diameter d1>d2> Valve body periphery small diameter part diameter (d3) 1. ing. Next, the operation will be described. Assuming that high pressure fluid is currently being communicated with the first port, the fluid passes through the first oil passage @ and enters the first oil chamber 21+.

When the solenoid device head is de-energized, the seat part (13B) of the valve body α3 is pressed by the spring head against the seat part (12B) of the fixed seat αn, and the second oil chamber (c) is pressed against the first oil chamber ■.
The partition is closed to p. Next, solenoid device q9
When energized, the movable iron core U and the valve body (13 springs) are attracted towards the fixed iron core (IIA) between the seat part (12B) and the seat part (13B). is opened by the preset opening degree n, 7'H, and the high-pressure fluid in the first oil sac 1) flows out into the second oil sac (c), passes through the second oil duct and the second port 13. leak to the outside.

Effects of the Invention) As explained above, according to the present invention, the valve body surrounds the fixed seat portion, and the valve action due to the contact between the seat portions is performed at the deep inner part of the valve substantially in the center. This provides a low-noise solenoid valve that has a sound insulation effect. Furthermore, the first oil chamber is well sealed by the sliding surface with the cylindrical sliding part on the periphery of the valve body and the sealing between the seat part and the seat part having the same diameter.
12111), when the pressure oil flows out, it is slightly constricted and rectified in the downstream flow path (end), so an even flow surface is formed.
Fluid force always acts only in the axial direction, so there is no increase in sliding resistance like in conventional products, and high responsiveness can be maintained even in a high pressure range (for example, 50 cm/csl).Furthermore, according to the present invention, fluid Since the inflow and outflow directions can be arranged in-line on the central axis of the pulp, machining of the flow path is easy and there is no need for side hole machining or communication path space machining, making it possible to downsize and reduce costs.90

[Brief explanation of drawings]

FIG. 1 is a sectional view of a solenoid valve according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view of the main part of a conventional product. 11...Body IIA...Fixed core (body) 12...Fixed seat 12A...Cylindrical sliding part 12B
... Fixed seat part 13 ... Square body 13B ... Movable seat seat 20 ... Spring 21 ... First oil chamber
22...$1 port 23...1st oil path 24...
・Second oil chamber 25...Second port 26...Second oil path agent Patent attorney Jun Kawachi Nimaya 1 piece

Claims (1)

[Claims] It has a first oil passage inside which communicates with a first port that communicates with a first oil chamber defined between a valve body that is arranged in fixed relation to the body, and that forms a fixed seat part at its tip and surrounds the valve body. In addition, a fixed seat having a cylindrical sliding part located between the tip end and the first port, and a spring disposed on the body so as to be able to slide on the cylindrical sliding part and fixedly connected to the body are used to provide constant operation. a second oil chamber having an inwardly movable seat that is pressed toward the fixed seat and can come into contact with the fixed seat; The solenoid valve includes the hollow cylindrical valve body having a second oil passage therein that communicates with the two ports, and the outer diameter of the cylindrical sliding part and the inner diameter of the seat seat are substantially the same. .