JPH05322067A - Valve housing - Google Patents

Abstract

PURPOSE:To provide a valve housing which does not allow the axial line of a valve seat to be slipped off from the axial line of a movable core. CONSTITUTION:It is so designed that the engaging hole of a cover body 22 and a press-in hole 30 including a lock surface 36 can be continuously machined and cut in the same process by the use of the same cutter in such a way that the lock surface locking the engaging surface 41 of a valve seat 24 is turned out to be an inclined surface projecting to the direction of the center of the press-in hole 30 as the valve seat 24 goes in the press-in direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in, for example, an electromagnetic valve which is incorporated in an antilock brake system of an automobile and is used for controlling a hydraulic pressure acting on a wheel cylinder to adjust a braking force. Regarding the valve housing.

[0002]

2. Description of the Related Art As shown in FIG. 4, the applicant of the present invention has a bottom portion 1 provided with a press-fitting hole 3 for press-fitting a valve seat 2 from below, and the inner peripheral surface of the press-fitting hole 3 is provided with the valve seat 2 described above. A locking surface 5 for locking the engaging surface 4 projecting on the outer peripheral surface of the valve is projected, and the fitting hole 7 formed in the opening 6 on the upper side is on the same axis L as the valve seat 2. A valve housing 12 to which a lid 11 having a guide body 10 for guiding the operation of a movable core 9 having a valve body 8 which is arranged and which can be seated on the valve seat 2 at its tip end is fitted has already been proposed. However, the locking surface 5 of the valve housing 12 is a surface perpendicular to the press-fitting direction (axis L direction) of the valve seat 2 as shown in FIG.

[0003]

Such a valve housing 1
In the case of No. 2, since the locking surface 5 is a surface perpendicular to the press-fitting direction of the valve seat 2, when the locking surface 5 is cut by the cutter 37 which is rotationally driven as shown in FIG. Due to the shape of the cutting edge 37a of the cutter 37, it is necessary to cut from the bottom 1 side of the valve housing 12. what if,
As shown in FIG. 7, when attempting to cut from the upper side of the valve housing 12, the cutting edge 37b of the cutter 37 must be a right angle surface like the locking surface 5, but such a cutting edge 37b is a so-called "cutting". It is not feasible because there is no "litter escape". Therefore, the step of cutting the fitting hole 7 for fitting the lid 11 and the step of cutting the press-fitting hole 3 including the locking surface 5 are performed while the same cutter 37 is attached to the cutting machine. It cannot be performed with the valve housing 12 fixed to the same jig. Therefore, there is a problem that the valve body 8 is not properly seated on the valve seat 2 due to the deviation of the axis of the valve seat 2 from the operation axis of the movable core 9, and the valve closed state becomes uncertain.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a valve housing in which the axis of the valve seat and the axis of the movable core do not deviate from each other.

[0005]

In order to achieve the above object, the present invention provides a bottom with a press-fitting hole for press-fitting a valve seat from below, and an inner peripheral surface of the press-fitting hole has the valve seat. A locking surface for locking the engaging surface projecting to the outer peripheral surface of the valve seat is projected, and a fitting hole formed in the upper opening is arranged on the same axis as the valve seat and has a tip at the end. In a valve housing to which a lid body having a guide body for guiding the operation of a movable core having a valve body that can be seated on a valve seat is fitted, the press-fitting is performed with the locking surface in the press-fitting direction of the valve seat. It is characterized in that it is an inclined surface projecting toward the center of the hole.

[0006]

The function of the press-fitting hole for press-fitting the valve seat and the fitting hole for fitting the lid having the guide body for guiding the operation of the movable core are the same step and the same without changing the chucking of the cutter. Since it can be cut with the cutter and with the same cutting machine, the axis of the press-fitting hole and the axis of the fitting hole do not deviate, and the valve seat and lid can be securely attached on the same axis, and therefore the valve seat The valve body is correctly seated on the valve seat and the valve closed state is ensured, without the axis line of (1) and the operating axis of the movable core being displaced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view of an electromagnetic valve provided with a valve housing according to the present invention. In FIG. 1, reference numeral 20 denotes a normally open electromagnetic valve, which is a valve housing 21 according to the present invention, a lid 22, The electromagnetic coil 23, the valve seat 24, the stopper 25, and the movable core 26 are main constituent elements.

The valve housing 21 has a cylindrical shape as shown in FIG. 3, has a large-diameter storage recess 28 extending from a substantially intermediate portion in the axial direction to an upper end side (upper portion) 21a, and has a substantially axial direction. A press-fitting hole 30 having a smaller diameter than the storage recess 28 is provided from the intermediate portion to the lower end side (bottom portion 29 side). The electromagnetic coil 23 is accommodated in the accommodating recess 28. The accommodating recess 28 opens on the upper end side 21a of the valve housing 21, and the fitting hole 3 is inserted into the opening 31 through a step 32.
3 is formed. The lid 22 is fitted into the fitting hole 33. Further, the valve seat 24 is press-fitted into the press-fitting hole 30 from below, the upper end of the press-fitting hole 30 opens at the center of the bottom surface 28a of the storage recess 28, and the lower end of the press-fitting hole 30 has the valve housing 21. Has an opening at the center of the lower end surface thereof, and the opening serves as an inlet 34. Press fit hole 3
The inner peripheral surface 30a of the lower end of the
It is c. An annular step portion 35 is integrally formed on the inner peripheral surface of the press-fitting hole 30 in the substantially middle portion in the axial direction. The annular step portion 3
The lower surface of 5 serves as a locking surface 36, and as shown in FIG. 2, the locking surface 36 moves toward the press-fitting direction of the valve seat 24.
It is an inclined surface protruding toward the center of the press-fitting hole 30.
The locking surface 36 of the valve seat 24 is attached to the locking surface 36.
1 is locked.

As shown in FIG. 3, the engaging surface 36 of the valve housing 21 is formed as an inclined surface, so that the inner peripheral surface 3 above the fitting hole 33 and the press-fitting hole 30 in the axial direction approximately in the middle.
0b, the engaging surface 36, and the inner peripheral surface 30a of the press-fitting hole 30 below the axially intermediate portion, the valve housing 21 is fixed to the same jig, and the same cutter 37 is used.
While being attached to the chuck or the like of the cutting machine, the valve housing 21 may be rotated while being fed from the lower end side to the upper end side. In this way, the fitting hole 33, the inner peripheral surfaces 30a and 30b of the press-fitting hole 30, and the locking surface 36 are fixed to the cutter 37.
Since the cutting can be performed by the same process and the same cutter 37 without changing the chucking, and by the same cutting machine, the axis of the press-fitting hole 30 and the axis of the fitting hole 33 do not deviate. In addition, in FIG. 3, a portion indicated by a chain double-dashed line is a prepared hole before cutting.

In this way, the lid 22, the electromagnetic coil 23, the valve seat 24, and the valve housing 21 are formed by cutting the fitting hole 33, the inner peripheral surfaces 30a and 30b of the press-fitting hole 30 and the engaging surface 36. The solenoid valve 20 is configured by incorporating the stopper 25, the movable core 26, and the like.

The lid 22 has an engaging hole 38 opened at the lower surface side in the center thereof, and the lid 22 covers the opening on the upper end side 21a of the valve housing 21. In addition, the lower surface of the lid 22 is concentric with the engaging hole 38 and the engaging hole 3
An annular projection 39 having a diameter larger than 8 is integrally formed.

The electromagnetic coil 23 comprises a bobbin 23a and an electrically conductive wire 23b wound around the outer peripheral surface of the bobbin 23a.
It is stored in the first storage recess 28. In the housed state, the center hole 23c of the bobbin 23a has the valve housing 2
It is aligned with the press-fitting hole 30 of No. 1 and the annular projection 39 of the lid 22. The middle portion of the sealing pipe 40 functioning as a guide is fitted in the center hole 23c of the bobbin 23a. The upper end of the pipe 40 is fitted in the annular projection 39 of the lid 22, and the lower end of the pipe 40 is fitted in the upper end side of the press-fitting hole 30 of the valve housing 21 in the axial direction substantially in the middle thereof.

The valve seat 24 has a cylindrical shape with an open lower end, and has a small diameter hole 24a at the center of the upper end thereof, and the opening peripheral edge of the small diameter hole 24a serves as a valve seat surface 24b. In the valve seat 24, the outer peripheral surface on the lower end side has a larger diameter than the outer peripheral surface on the upper end side with respect to the substantially middle portion in the axial direction, and the boundary portion between the small diameter portion and the large diameter portion of the outer peripheral surface serves as the engagement surface 41. The valve seat 24 is press-fitted into the press-fitting hole 30 from below so that the engagement surface 41 is engaged with the engagement surface 36.
The inlet 34 of the valve housing 21 is connected to the valve seat 2
The small-diameter hole 4a, the outer peripheral surface of the valve seat 24 and the inner peripheral surface of the press-fitting hole 30a of the valve housing 21 communicate with the outlet 43 of the side surface of the valve housing 21. ..

The stopper 25 is press fitted into the engaging hole 38 of the lid 22. The upper end portion of the guide body 40 is fitted into the annular protrusion 39 of the lid body 22 into which the stopper 25 is press-fitted and fixed. Then, the lid 22 is attached to the valve housing 21.
The lid 22 is fixed to the valve housing 21 as shown in FIG. 1 by fitting the stepped portion 32 of the upper end side opening 31 and bending the upper end peripheral portion of the valve housing 21. 26 is located inside the upper end side of the guide body 40.

The movable core 26, as shown in FIG.
It is located within 0 and is movably arranged in the axial direction between the valve seat 24 and the fixed core 25. The movable core 26 is
A spherical valve element 44 is fixed to the tip portion (lower end portion in FIG. 1), and the valve element 44 contacts and separates from the valve seat surface 24b of the valve seat 24.

The movable core 26 is attached to the valve body 44 by a spring 45.
Is pressed in a direction away from the valve seat surface 24b (upward in FIG. 1). The spring 45 is interposed between the spring hook portion 26 a of the movable core 26 and the upper surface of the annular step portion 35.

In FIG. 1, 46 is a connection terminal of the electromagnetic coil 23, 47 is an inflow side filter provided at the inflow port 34, 48 is an outflow side filter provided at the outflow port 43, 4
Reference numerals 9 and 50 are O-rings, and 51 is a modulator body for controlling the anti-lock brake in which the solenoid valve 20 is mounted.

Next, the operation of the solenoid valve 20 having the above construction will be described.

When the electromagnetic coil 23 is not energized,
That is, when the electromagnetic coil 23 is not excited, the movable core 26 is pressed upward in FIG. 1 by the urging force of the spring 45, the valve element 44 is separated from the valve seat surface 24 b of the valve seat 24, and the inflow port 34 is formed.
1 and the outlet 43 communicate with each other through a small diameter hole 24a of the valve seat 24 and a gap 42 between the outer peripheral surface of the valve seat 24 and the inner peripheral surface of the press-fitting hole 30 of the valve housing 20, as shown in FIG. Thus, the valve is open.

When the electromagnetic coil 23 is energized from the state shown in FIG. 1, the electromagnetic coil 23 is excited, and the magnetic force causes the movable core 26 to resist the urging force of the spring 45 and the valve seat 24.
Is magnetically attracted to the side, and the valve element 44 causes the valve seat 24
Sit on 4b. Therefore, the valve body 44 blocks the space between the inflow port 34 and the outflow port 43 to close the valve.

When the electromagnetic coil 23 is de-energized from this state, the valve is opened again as shown in FIG.

In such a solenoid valve 20, if the axis of the valve seat 24 and the axis of the movable core 26 do not coincide with each other, the seating accuracy of the valve element 44 with respect to the valve seat 24a is greatly affected. Each part must be assembled with high precision so that they match.

Therefore, in the present invention, the engagement surface 36 of the valve housing 21 is an inclined surface projecting toward the center of the press-fitting hole 30 as the valve seat 24 is fitted in the press-fitting direction. Since the inner peripheral surface of the press-fitting hole 30 and the locking surface 36 can be cut by the same step and the same cutter 37, the lid 22 with the guide body 40 and the valve seat 24 can be aligned with their axes. The valve housing 20 can be assembled in a matched state.

[0025]

As described above, according to the valve housing of the present invention, the locking surface that locks the engaging surface of the valve seat is an inclined surface projecting toward the center of the press-fitting hole in the press-fitting direction of the valve seat. As the press-fitting hole including at least the locking surface and the fitting hole of the lid body can be continuously cut by the same cutter that is driven to rotate around the axis of the valve seat, the misalignment of the axial center of each hole is prevented. This can be prevented, and there is no deviation between the axis of the valve seat and the axis of the movable core, so that the valve body is properly seated on the valve seat and the valve closing operation is ensured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid valve including a valve housing according to an embodiment of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is an explanatory drawing for cutting each hole of the valve housing shown in FIG.

FIG. 4 is a partially cutaway side view of a solenoid valve including a conventional valve housing.

5 is an enlarged view of part B in FIG.

FIG. 6 is an explanatory view of cutting of the locking surface of the valve housing shown in FIG.

FIG. 7 is a diagram similar to FIG. 6 for explaining a conventional problem.

[Explanation of symbols]

 20 Solenoid Valve 21 Valve Housing 21a Upper End (Upper) 22 Lid 24 Valve Seat 26 Movable Core 29 Bottom 30 Press-Fit Hole 33 Fitting Hole 36 Locking Surface 40 Guide Body 41 Engagement Surface 44 Valve Body

Claims (1)

[Claims] 1. A bottom portion is provided with a press-fitting hole for press-fitting a valve seat from below, and an inner peripheral surface of the press-fitting hole locks an engaging surface projecting to an outer peripheral surface of the valve seat. Of the movable core, which has a locking surface projecting therefrom, is arranged on the same axis as the valve seat in the fitting hole formed in the upper opening, and has a valve body at the tip end that can be seated on the valve seat. In a valve housing to which a lid body having a guide body for guiding the valve is fitted, the locking surface is an inclined surface protruding toward the center of the press-fitting hole in the press-fitting direction of the valve seat. And valve housing.