JP2851695B2 - Valve manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology that can be effectively used for a valve requiring high precision, such as a switching valve in a brake device of a vehicle, for example, a valve for ABS / ASR control.

[Prior art and its problems]

As one type of control valve of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-16355, a sleeve having openings at both ends and a first fitting fixed to each opening at both ends of the sleeve. And a second block member, and a movable valve body movably disposed in a space defined inside the sleeve by the first and second block members. . In the case of manufacturing such a valve, conventionally, generally, a sleeve cut to a predetermined length is prepared, first, a first block member is inserted and fixed to one end of the sleeve, and then a movable valve body is provided inside the sleeve. After that, the second block member is attached to the other end of the sleeve. However, if there is a dimensional error of each part or an assembly error between the parts, the errors accumulate, and the stroke (valve lift) of the movable valve body inside the sleeve greatly varies. Then, it is difficult to control the valve with high accuracy. Then, when studying to improve the assembling accuracy of the valve itself, the following was found. That is, the first block member of the two block members is fixed to the sleeve by a certain fixing means such as press fitting, but the first block member is located in the sleeve according to the degree of press fitting for fixing. The position of the inner end face of one block member varies considerably with respect to the sleeve. The amount of the variation is large compared to the assembly error of the other parts, and it alone corresponds to the entire assembly accuracy required for the valve.

DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a technique capable of reliably eliminating an error caused by assembling a sleeve and a first block member in order to minimize variations in a stroke of a movable valve body inside a sleeve. And According to the present invention, the first block member is inserted into the sleeve from the opening on one end side of the sleeve, and the first block member is fixed to and integrated with the sleeve, and then the first block member is integrated. The other end of the sleeve is cut at a position of a predetermined length from the inner end surface of the sleeve, and thereafter, the movable valve body is inserted into the sleeve from the opening on the other end of the sleeve, and the opening on the other end is The second second block member is mounted on the second block member. Thereby, the substantial assembly error of the first block member with respect to the sleeve in question can be reduced to almost zero.

【Example】

Next, embodiments of the present invention will be described with reference to the accompanying drawings. The valve 100 is a valve that includes a movable valve body 25 inside the sleeve 20 and that opens and closes when the movable valve body 25 moves in the axial direction of the sleeve 20. And the sleeve
Each opening at both ends of 20 is a cap-shaped first block member
21 and a relatively long second block member 22
Each is blocked. Therefore, the stroke of the movable valve body 25 inside the sleeve 20 is controlled by the first block member 21.
Is determined by the distance between the inner end surface 21a of the second block member 22 and the inner end surface 22a of the second block member 22. Here, the second block member 22 is relatively loosely fitted on the inner periphery of the sleeve 20 with the O-ring 50 attached to the outer periphery, whereas the cap-shaped first block member 21 is Once they are fixed to the sleeve 20, they are fixed by fixing means that cannot be easily separated.
Normally, press-fitting is used as the fixing means, but in this example, the degree of press-fitting is reduced, and secure fixing is performed by breathing. Band 60 with rectangular cross section
Are the welded portions of copper by breathing. In the present invention, when assembling the internal components to the sleeve 20, first, the first block member 21 is inserted into one opening of the sleeve 20 and fixed. After the fixing is completed, the other end of the sleeve 20 is cut at a position of a predetermined length from the inner end face 21a of the first block member 21. Even if it says cutting, since the adjustment length is small, only grinding is enough. As a result of processing the other end of this sleeve 20, the sleeve
The assembling error of the first block member 21 with respect to 20 is almost zero. After this, the movable valve element 25 is inserted into the sleeve 20 with the spring 27 incorporated in the groove 25a,
Next, one end of the second block member 22 is fitted into the opening on the other end of the sleeve 20. As described above, since the O-ring 50 is provided at one end of the second block member 22, by providing the inner surface of the end of the sleeve 20 with the taper 20t, the O-ring 50 is not damaged at the time of fitting. Like that. The taper 20t also has the effect of facilitating the processing for adjusting the length. The valve 100 is a normally closed solenoid valve, and a solenoid 23 that applies an exciting force to the movable valve body 25 is provided on the outer periphery of a sleeve 20 made of nonmagnetic metal such as stainless steel. The solenoid 23 is a bobbin 23 made of synthetic resin.
1 and a coil wire 232 wound around the bobbin 231. The solenoid 23 has one end on the flange portion 21f of the first block member 21 and the other end on the iron ring 2.
While being supported by the respective members 4, they are at predetermined positions on the outer periphery of the sleeve 20. The second block member 22 of the valve 100 has a center hole 26 penetrating the center from one end on the small diameter side to one end on the large diameter side, and one end starts from one end on the large diameter side alongside the center hole 26. There is a side hole 28 whose other end is open on the side surface on the smaller diameter side. An opening portion 26a of the center hole 26 of the second block member 22 is a valve seat, and a ball 25b fixed at the center of the movable valve body 25 is opposed to the valve seat 26a so as to be seated. In the movable valve body 25, the ball 25b is normally seated on the valve seat 26a as shown in the drawing by the urging force of the spring 27. On the other hand, when a command is received from a controller (not shown), the solenoid 23 is excited, and the exciting force causes the movable valve body 25 to move, so that the ball 25b is separated from the valve seat 26a. The solenoid valve 100 is configured such that a part of the second block member 22 is placed in the stepped recess 11 of the cylinder body 10 and the cup-shaped casing 30 is fixed by a plurality of bolts. Attached to 10 side. The communication ports for the cylinder body 10 side are one opening 26b of the center hole 26 and the opening 28b of the side surface of the side hole 28, both of which are located on the small diameter side of the second block member 22. Therefore, one communication port 26b communicates with the passage 15 opened near the bottom of the recess 11, and the other communication port 28b is
It communicates with another passage 16 which is opened in the middle of the inner wall of the recess 11. In addition, annular filters 41 and 42 are provided at the respective communication ports of the solenoid 100 to prevent dust and the like from entering the valve seat 26a seated on the ball 25b. In the drawing, reference numerals 51 and 52 denote sealing members similar to the O-ring 50 arranged on the outer periphery of the second block member 22.

【The invention's effect】

In the present invention, attention is paid to the first block member 21, which is particularly difficult to obtain high assembling accuracy with respect to the sleeve 20, and after fixing the first block member 21 to one end of the sleeve 20, Since the other end of the sleeve 20 is cut so as to have a predetermined length, the mounting error of the first block member 21 which is a problem can be reliably reduced to almost zero. As a result, the variation in the stroke of the movable valve body 25 can be considerably reduced, and a highly accurate valve can be provided.

[Brief description of the drawings]

The drawing is a diagram showing a cross-sectional structure showing one embodiment of a valve manufactured by applying the present invention. 10 ... cylinder body, 20 ... sleeve, 21 ... first block member, 22 ... second block member, 23 ... solenoid, 25 ... movable valve body, 100 ... valve.

Claims (2)

(57) [Claims] 1. A first block member is inserted into the sleeve through an opening on one end side of the sleeve, and the first block member is fixedly integrated with the sleeve, and then the first block member is integrated with the sleeve. Cut the other end of the sleeve at a position of a predetermined length from the inner end surface of the member, and thereafter, insert a movable valve body into the sleeve from the opening on the other end of the sleeve, and A method of manufacturing a valve for assembling a second block member to an opening. 2. The movable valve body has a ball at a central portion at one end thereof, and the ball can be seated on a valve seat provided on one of end surfaces of the first and second block members. Item 10. A method for manufacturing a valve according to Item 1.