JPS61109983A - Solenoid valve - Google Patents

Abstract

PURPOSE:To improve the response characteristics of opening and closing a liquid passage by fixedly connecting a movable iron core around the movable member of the valve mechanism, and slidably supporting the movable member by a fastening part of the valve case. CONSTITUTION:The valve body 4 is contained in the valve case 1 to be engaged with and disengaged from the valve seat 3. Its shaft on the valve seat side 3 is slidably supported at an area near to the end by a lock guide 5, and the shaft on the opposite side by a plate 6 at an area near to the end. A movable iron core 8 is integrally connected to the valve body 4 by press-fit, etc., and is so constructed as to be floatingly supported relative to the valve case 1. Therefore, an increase in the contact area that would otherwise result when the iron core 8 is to be slidably supported can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a solenoid valve, and more particularly, to a small solenoid valve with excellent opening/closing response of a liquid passage.

[Background of the invention]

Conventionally, for example, automobile brake systems have been equipped with various types of solenoid valves related to anti-skid devices, auto brake devices, etc. 9 These solenoid valves are used to energize and de-energize solenoids There are many types in which the movement of a movable iron core that moves in response to the vibration is transmitted directly or via a granger rod, etc., to the valve bodies of on-off valves arranged sequentially in the axial direction, and the on-off valves are switched on and off. There are also those in which the valve body is the core itself.

By the way, it goes without saying that such electromagnetic valves are generally required to be smaller in size, and when used in the braking systems of automobiles as mentioned above, it is necessary to improve responsiveness in addition to the above-mentioned reduction in size. Further improvement is also desired.

[Purpose of the invention]

In view of the above, the present invention has been made with the object of providing a solenoid valve that is small in size and has excellent responsiveness in opening and closing a liquid passage.

[Summary of the invention]

The gist of the present invention, which has been made to achieve the above-mentioned object, is that a movable iron core, which is normally biased to a rest position by a return spring and moves against the return spring under magnetic action, and an abutment , a valve mechanism including a pair of valve seats and a valve body that open and close a liquid passage when separated, one of the valve seats and the valve body being a fixed body and the other being a moving body, is housed in a valve case housing a solenoid. The movable iron core is integrated with the outer periphery of the movable body of the valve mechanism, and the movable body with a diameter of Mfi is
The electromagnetic valve is characterized in that a movable iron core is slidably supported by a fixed part of a valve case, and thereby a movable iron core is supported in a floating manner.

The reason why the electromagnetic valve according to the present invention has the above structure is as follows.

In other words, what is generally considered important in the design of a solenoid valve is to reduce the sliding resistance of the movable iron core and to ensure as large a magnetic flux passage area as possible in terms of improving response. In addition, from the perspective of ensuring operational stability and device reliability, it is important to prevent the occurrence of scratches, sticks, etc. in the moving parts.

For the purpose of improving responsiveness mentioned above, it is possible to increase the diameter of the movable iron core in order to secure the magnetic flux passage area, but this is not possible.
In a type of sliding support using a group case, the sliding contact area increases, so it is not necessarily effective in improving responsiveness and the device becomes larger.

Therefore, in the present invention, the movable iron core is integrated with the valve body (moving body) to prevent the contact area from increasing due to sliding support of the movable iron core.

Furthermore, if the valve body (moving body) integrated with the movable iron core is slidably supported on both sides of the movable iron core in the axial direction, the support length becomes longer and the inclination of these moving members is suppressed. This means that the occurrence of flange and stickiness will be significantly reduced.

[Embodiments of the invention]

The present invention will be described below based on embodiments shown in the drawings.

The solenoid valve shown in the figure is a combination of a normally closed valve in the upper half and a normally open valve in the lower half. The difference is that the opening/closing mode is reversed, but the components are the same.Therefore, common components are given the same reference numerals, and the explanation will be based on the normally closed valve in the upper half. I took it as a thing.

In the figure, reference numeral 1 denotes a cylindrical valve case, and the valve case 1 of this example has a magnetic material 1& from the top of the figure.

It has a structure in which 1c, 1e and non-magnetic materials 1b, ld are sequentially welded and integrated by friction welding.

2 is a pulp notebook solidified at the open end of the valve case 1, having an axial liquid passage 2a, and
A valve seat 3 of a valve mechanism is formed at the inner end of the valve case 1 of the night passage 2&.

4 is a valve body, which is housed in the valve case 1 so as to be able to come into contact with and separate from the valve seat 3, and a rod made of a non-magnetic material is attached to the shaft near the end on the valve seat 3 side. The outer circumferential portion is slidably supported by the outer circumferential portion 5, and the shaft portion near the opposite end is slidably supported by the outer circumferential portion by a magnetic plate 6. However, the mouth, the door 5, and the grate 6 are fixed to the pulp case 1, respectively. In addition, in the normally open valve shown in the lower half of the figure, the rod guide 5 and the grate 6 are made of a magnetic material and the latter is a non-magnetic material, contrary to the normally closed valve shown in the upper half of the figure. It has become.

In this example, a return sedge ring 7 is installed on the valve body 4, so that the valve body 4 is brought into contact with the valve seat 3 in a normally closed type valve, and the valve body 4 is brought into contact with the valve seat 3 in a normally open type valve. The bodies 4 are separated from each other.

Reference numeral 8 denotes a movable iron core, which is integrated into the valve body 4 by press fitting, etc., and has a structure in which it is supported floatingly with respect to other components (valve case, rod ID, grate). ing.

In addition, appropriate flow paths are formed in each of the constituent members in the above-mentioned group case to allow the necessary flow of liquid.

Reference numeral 9 denotes a solenoid mounted on the outer periphery of the valve case 1, and is provided so as to form a magnetic circuit shown by the arrow line in the figure for each of the normally closed type valve and the normally open type valve. That is, in a normally closed type valve, the valve body 4 moves against the return spring 7 due to magnetic action, thereby separating the valve body 4 from the valve seat 3; The body 4 is brought into contact with the valve seat 3.

According to the above configuration, the integrated valve body 4 and movable iron core 8 have a sliding support contact because the small diameter valve body 4 is indirectly supported by the valve case 1. The area of the movable iron core 7 is small, reducing sliding resistance, and the movable iron core 7 can be given a diameter dimension to ensure a sufficient magnetic flux passage area without being restricted by such a support form.
Since the cross-sectional area of the shaft center is small even if it is a non-magnetic material, there is almost no difference in the outer diameter to ensure the same cross-sectional area as a solid movable iron core, so it is possible to create a small and responsive solenoid valve. Assembly is accomplished.

According to experiments, the response speed of a solenoid valve with a similar rated solenoid was improved by about 3 to 5 times compared to a conventional type.

In addition, in the case of this embodiment, since both ends of the valve body 4 are slidably supported, a sufficient support length for two-point support is provided). This solenoid valve effectively suppresses the tilting of the movable iron core 7 and has the effect of almost no flaring or sticking.

〔Effect of the invention〕

As described above, the solenoid valve according to the present invention is small and has excellent responsiveness as a device for opening and closing a liquid passage, and is particularly suitable for use in automobiles. It has the advantage of being extremely effective as a component such as a rake-type anti-skid device that requires light weight and quick response.

[Brief explanation of drawings]

The drawing is a sectional view showing a solenoid valve according to an embodiment of the present invention. 1: Valve case 2 Valve seat 3: Valve seat
4: Valve body 5: Rod void 6: Grate 7: Movable iron core 8: Return spring 9:
solenoid a

Claims (2)

[Claims] 1. It usually includes a movable iron core that is biased to a rest position by a return spring and moves against the return spring under magnetic action, and a pair of valve seats and a valve body that open and close a liquid passage by engaging and separating. A solenoid valve includes a valve mechanism in which one of a valve seat and a valve body is a fixed body and the other is a movable body, and is housed in a valve case housing a solenoid. A solenoid valve characterized in that the core is integrated and the small diameter moving body is slidably supported by a fixed part of a valve case, thereby supporting the movable iron core in a floating manner. 2. 2. The electromagnetic valve according to claim 1, wherein the movable body of the valve mechanism is slidably supported by the valve case fixing portion near both ends of the shaft portion protruding on both sides in the axial direction of the movable iron core.