JP2017203531A - Manufacturing method of solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a solenoid valve in which a housing and a yoke are divided to be configured as independent components, surface treatments such as plating treatment and heat treatment are performed only on the yoke, and the yoke is press-fitted and caulked to the housing.SOLUTION: A solenoid valve 10 is composed of an electromagnetic portion 11 and a pressure adjustment portion 12. The pressure adjustment portion 12 is axially moved in response to excitation of the electromagnetic portion 11. In the solenoid valve 11, a pin 13 coaxially disposed on a poppet 19 is integrally fastened to a movable core 14. The movable core 14 is slidably inserted and fitted to the yoke 16 at an upper part and slidable to a fixed core 15 disposed in opposition to the yoke 16 at a lower part. Outer peripheral faces of the yoke 16 and the fixed core 15 are inserted and fitted to an inner peripheral face of a solenoid case 17, and the yoke 16 and the fixed core 15 are molded integrally by a housing 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing an electromagnetic valve for controlling fluid such as an electromagnetic proportional valve for hydraulic control and an ON-OFF valve of an automatic transmission of an automobile.

  2. Description of the Related Art Conventionally, this type of electromagnetic valve, for example, an electromagnetic valve 10 having a housing 14 (denoted by reference numerals described in Patent Document 1, the same applies hereinafter), a yoke 22, a fixed core 24, a movable core 26, a coil assembly 20, and the like is disclosed. Has been. The electromagnetic valve 10 is configured such that the housing 14 and the yoke 22 are formed of the same component, and the yoke 22 and the movable core 26 are in contact with each other and slide (for example, see Patent Document 1).

JP 2005-276966 A

However, in the structure of Patent Document 1, the housing 14 and the yoke 22 are configured as the same part. Therefore, when plating, heat treatment, or surface treatment is performed on the surface of the yoke 22 in order to increase mechanical strength, the housing Since the surface treatment must be performed every 14th, there is a problem that the component size increases and the cost of the surface treatment increases.
Further, since the yoke 22 and the movable core 26 come into contact with each other and slide, the parts are worn and the durability may be deteriorated.

  The present invention has been made to solve the above-mentioned problems. The housing is separated from the yoke and formed as a separate part. Only the yoke is subjected to surface treatment such as plating or heat treatment, and then the yoke is press-fitted into the housing. It is an object of the present invention to provide a method for manufacturing a solenoid valve for crimping.

In order to solve the above problems, the invention according to claim 1
A solenoid valve having a pressure regulating portion that forms a hydraulic pressure supply port by a poppet that is slidably inserted into the seat holder, and an electromagnetic portion that is integrally attached to the pressure regulating portion;
The electromagnetic part is
A solenoid case wrapped with a coil wire;
A yoke engaged with one end surface of the solenoid case and inserted into the solenoid case;
A fixed core that is engaged with the other end surface of the solenoid case and is fitted into the solenoid case, facing the yoke;
A movable core that is slidably fitted into the yoke and disposed opposite the fixed core;
A pin attached to the movable core and supported by the fixed core;
A housing formed by integrally molding the yoke, the solenoid case and the fixed core;
With
The yoke and the housing are formed separately, and only the yoke is plated, heat-treated, surface-treated, press-fitted into the housing, and then crimped, whereby the yoke is coaxial with the movable core. It is characterized by ensuring the degree.
According to the present invention, an appropriate material can be selected for each of the yoke and the housing, and the cost of the solenoid valve can be reduced.

  In the present invention, the electromagnetic force can be ensured by individually forming the yoke and the housing, press-fitting the yoke into the housing, and crimping the yoke.

It is a schematic longitudinal cross-sectional view of the solenoid valve which concerns on the manufacturing method of implementation of this invention.

Hereinafter, preferred embodiments of a proportional solenoid valve according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view showing a configuration of an electromagnetic valve 10 according to the present invention.
As shown in FIG. 1, the electromagnetic valve 10 includes an electromagnetic unit 11 and a pressure adjusting unit 12, and the pressure adjusting unit 12 moves in the axial direction in response to excitation of the electromagnetic unit 11.
First, the electromagnetic unit 11 will be described. As shown in FIG. 1, the electromagnetic valve 11 has a pin 13 disposed coaxially with the poppet 20 and fastened integrally with the movable core 14.

  The movable core 14 is slidably inserted into the yoke 16 at the upper side, and is slidable on the fixed core 15 disposed facing the yoke 16 at the lower side. The yoke 16 and the fixed core 15 are inserted into the inner peripheral surface of the solenoid case 17 at the outer peripheral surface in the axial direction, the yoke 16 is press-fitted into the housing 18 and fixed by crimping, and the fixed core 15 is fixed by crimping to the housing 18. Has been.

On the other hand, the pressure adjusting unit 12 is engaged with the fixed core 15 and a sheet holder 20 into which the poppet 19 is slidably fitted is engaged with the fixed core 15 and fixed to the housing 18 by crimping.
A sleeve hole 21 is formed in the sheet holder 20, and a poppet 19 is slidably inserted into the sleeve hole 21. The sheet holder 20 has a supply port 22 for communicating a pump (not shown) and a sleeve hole 21 in order from the electromagnetic unit 11, a control port 23 for communicating an actuator (not shown) and the sleeve hole 21, a tank and a sleeve hole 21 (not shown). A tank port 24 communicating with the tank

  In this embodiment, the yoke 16 and the housing 18 are formed as separate parts, and the yoke 16 is plated, heat-treated, and surface-treated, so that the housing 14 and the yoke 22 are connected as described in Patent Document 1. Cost can be reduced compared to an integrated solenoid valve.

Further, when the housing 14 described in Patent Document 1 is integrated with the yoke 22, the yoke 16 and the housing 18 are formed as separate parts as in the present invention, and the yoke 16 is press-fitted into the housing 18 to be added. By tightening, the coaxiality of the yoke 16 can be ensured with respect to the movable core 14.
Further, since the eccentricity of the movable core 14 with respect to the fixed core 15 is suppressed by ensuring the coaxiality between the movable core 14 and the yoke 16, side force (radial electromagnetic force) can be reduced, and sliding resistance can be reduced. Reduction and friction prevention can be performed.

Since the solenoid valve 10 of the present invention can sufficiently ensure the coaxiality of the yoke 16 with respect to the movable core 14 and the fixed core 15, the electromagnetic force of the electromagnetic part 11 can be maintained.
Moreover, since the proper material can be selected for each of the yoke 16 and the housing 18, the cost of the solenoid valve 10 can be reduced.

DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Electromagnetic part 12 Pressure regulation part 13 Pin 14 Movable core 15 Fixed core 16 Yoke 17 Solenoid case 18 Housing 19 Poppet 20 Sheet holder 21 Sleeve hole 22 Supply port 23 Control port 24 Tank port

Claims (1)

A solenoid valve having a pressure regulating portion that forms a hydraulic pressure supply port by a poppet that is slidably inserted into the seat holder, and an electromagnetic portion that is integrally attached to the pressure regulating portion;
The electromagnetic part is
A solenoid case wrapped with a coil wire;
A yoke engaged with one end surface of the solenoid case and inserted into the solenoid case;
A fixed core that is engaged with the other end surface of the solenoid case and is fitted into the solenoid case, facing the yoke;
A movable core that is slidably fitted into the yoke and disposed opposite the fixed core;
A pin attached to the movable core and supported by the fixed core;
A housing formed by integrally molding the yoke, the solenoid case and the fixed core;
With
The yoke and the housing are divided and formed individually, and only the yoke is plated, heat-treated, surface-treated, press-fitted into the housing, and caulked to be coaxial with the movable core. A method of manufacturing a solenoid valve characterized by securing a degree.

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