JPH0522111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solenoid valve, and particularly to a solenoid valve for controlling brake fluid pressure used in an anti-skid brake system of a vehicle.

[Prior Art] This type of brake fluid pressure control solenoid valve includes a core housed in a main body and around which an electromagnetic coil is wound;
a plunger disposed within the main body opposite to the core and slidably supported within the sleeve;
Conventionally, there has been known a device that controls the opening and closing of a valve mechanism by attracting a plunger to the core when the coil is energized, and separating the plunger when the coil is de-energized, thereby blocking communication between the fluid passages formed in the main body. It is being

[Problem that the invention seeks to solve]

Such a brake fluid pressure control valve is required to have a fast and stable operation response speed, and is also required to ensure a predetermined flow path when the valve is opened. For this purpose, each component must be finished with extremely high precision, which poses a major problem in terms of cost and performance.

[Means to solve the problem]

In the method of the present invention, after a stopper for regulating the limit of movement of the plunger when the valve mechanism is opened is press-fitted to a predetermined depth into a hole in the core, the plunger, or the plug, the seat is inserted into the core, the plunger, or the plug.
The plug is press-fitted and fixed into the part of the plug that faces the valve body while adjusting it to a predetermined depth.

[Effect]

By adjusting the seat and stopper to a predetermined depth and press-fitting them, the gap between the plunger and the core and the stroke of the valve mechanism can be set to a predetermined value when the plunger is not in operation. Errors are absorbed.

[Embodiments of the invention]

The present invention will be explained below based on illustrated embodiments.
FIG. 1 shows an example of a solenoid valve for controlling brake fluid pressure. Reference numeral 1 denotes a solenoid valve body, and a plurality of steps are formed in a hole inside the solenoid valve body. A core 3 around which an electromagnetic coil 2 is wound is arranged through a sleeve 4 within the large diameter portion 1a of the hole of the main body 1, and is fixed at the open end 1b. A plunger 5 is accommodated in the small diameter portion 1c of the hole in the main body 1 so as to face the core 3, and a plug 6 is attached to the outside of the plunger 5. The sleeve 4 and the plug 6 are made of a non-magnetic material, and the plunger 5 is slidably supported by the large diameter hole 6a of the plug 6 and the sleeve 4. The plunger 5 is urged in a direction away from the core 3 (to the left in FIG. 1) by a return spring 7 loaded between the side end surface 5a of the core 3 and the stepped portion 3a of the core 3. By coming into contact with a stopper 8 press-fitted into the shaft portion of the plug 6, the plug 6 is stopped while maintaining a predetermined gap a between it and the core 3. This gap a is the gap between the plunger 5 and the core 3 when they are not in operation. Further, the small diameter portion 1c of the hole in the main body 1 has an inner diameter slightly larger than the outer diameter of the plunger 5, and a gap c is formed between the plunger 5 and the main body 1.

The plunger 5 is formed into a cylindrical shape, and a holder 10 having a spherical valve body 9 caulked at its tip is housed inside the plunger 5 . The holder 10 and the valve body 9 are connected to a ring 11 fitted on the plug 6 side of the plunger 5 and a spring seat 10a on the outer periphery of the polder 10.
The spring seat 10a is biased toward the core 3 by a spring 12 mounted between the spring seat 10a and the spring seat 10a, so that the back side of the spring seat 10a is stopped by being engaged with a stepped portion 5b formed on the plastic gear 5. On the other hand, a seat 13 is press-fitted into the axial center of the core 3 on the plunger 5 side, and the seat 13 and the valve body 9 constitute a valve mechanism 14 . As shown in an enlarged view in FIG. 2, this valve mechanism 14 is open when not in operation, and a gap b is formed between the seat 13 and the valve body 9. This gap b becomes the stroke amount of the valve body 9 during operation.

The core 3, the seat 13, the stopper 8 and the plug 6 have holes 3b, 13a, 8a,
6b is bored, and the plunger 5 is formed with an axial passage 5c on the outer circumferential surface and an internal passage 5d. 5
e, the hole 11a of the ring 11, etc. serves as a passage for brake oil. Note that O-rings 15, 16, and 17 are interposed between the main body 1, the sleeve 4, and the plug 6, and between the sleeve 4 and the core 3, respectively, to maintain liquid tightness.

This electromagnetic valve is used for controlling brake fluid pressure by being connected, for example, to a master cylinder on the right side in FIG. 1 and to a wheel cylinder on the left side. As mentioned above, since the plunger 5 is urged away from the core 3 by the return spring 7,
When the coil 2 is energized, the plunger 5 is attracted to the core 3, so that the valve body 9 is seated on the seat 13 and the brake fluid passage is opened when the coil 2 is energized. It is designed to block the brake fluid passage. The opening/closing speed of the valve mechanism 14 and the size of the flow path when opened are determined by the gap a during non-operation and the operating stroke d, and therefore, strict accuracy is required. Therefore, in the method of the present invention, when assembling, first the stopper 8 is press-fitted into the hole 6a formed in the shaft portion of the plug 6 while adjusting the amount of protrusion, so that the gap a when not in operation is
is set to a predetermined value, and then the sheet 13 is set to the core 3.
By press-fitting into the hole 3c of the shaft part, the operating stroke d is adjusted, set to a predetermined value, and fixed. It goes without saying that liquid tightness is maintained between the outer periphery of the sheet 13 and the hole 3c of the core 3. Since the stopper 8 and the seat 13 are adjusted and fixed by press fitting in this manner, it is possible to absorb dimensional errors in the axial direction due to processing of the parts, and it is possible to improve performance, reduce costs, and further downsize.

Further, in the above embodiment, the valve body 9 is connected to the plunger 5.
Since the valve mechanism 14 is absorbed into the valve body and held by the spring 12 so as to be relatively movable, when the valve mechanism 14 is opened, it can be opened to a greater extent than the operating stroke at the time of starting, thus improving the operating response. Therefore, even if the gap between the valve body 9 and the seat 13 is made as small as possible, a sufficient flow path area can be ensured when the valve is opened.

In this embodiment, the valve body 9 is connected to the plunger 5.
The sheet 13 is held at the core 3, and the stopper 8
are press-fitted into the plug 6, but even in the case of electromagnetic valves with various different configurations, such as those in which the stopper is press-fitted into the plunger or core, the seat and stopper can be press-fitted while adjusting the seat and stopper. By fixing the gap and the operating stroke when not in operation, it is possible to set the gap and operating stroke to desired values.

FIG. 3 shows a different type of electromagnetic valve from the embodiment shown in FIG. 1, which has two valve mechanisms and passages in three directions. This electromagnetic valve is used, for example, with passages at both ends connected to a pressure valve (left side in the figure) and a reservoir (right side in the figure), and a passage communicating between both valve mechanisms connected to a wheel cylinder.

A pair of electromagnetic coils 10 are arranged inside a cylindrical main body 101.
A core 103 in which the cores 2 and 102 are wound through sleeves 104 and 104 is housed, and plungers 105 and 105 are disposed facing each other on both end surfaces of the core 103, respectively. And plunger 105,
Plugs 106, 106 are fixed to both ends of the main body 101 via annular members 120, 120 fitted to the plungers 105, 105.
are sleeves 104, 104, annular members 120, 1
20 and is slidably supported within the end holes of the plugs 106,106.

A stepped hole 121 having a larger diameter at the middle portion is formed in the axis of the core 103, and a pair of rods 122, 122 are accommodated within this hole 121. These rods 122, 122 are connected to the compression spring 12.
3 in a direction that separates them from each other.

Each plunger 105, 105 is formed into a cylindrical shape, and inside thereof is a valve body 109, 1 having a spherical shape at the tip.
Holders 110 and 110 having 09 crimped therein are housed, respectively. These holders 110, 11
0 is biased toward the plugs 106, 106 by springs 112, 112 elastically loaded between the stepped portions of the plungers 105, 105 on the side of the core 103 and the spring seats 110a, 110a on the outer periphery of the holder. on the other hand,
A seat 11 is provided at the shaft center of the plugs 106, 106.
3,113 is press-fitted, and this sheet 11
3 and 113 and the valve bodies 109 and 109 constitute a pair of valve mechanisms 114 and 114. Also, stoppers 108, 108 are press-fitted into holes at the side ends of the core 103 of the plungers 105, 105, and both the plungers 105, 105 are pushed out by the elastic force of the spring 123 in the core 103. The tips of the rods 122, 122, which are urged toward the plugs 106, are urged toward the plugs 106, 106 by pressing the stoppers 108, 108. Therefore, the valve mechanisms 114, 114 are connected to the electromagnetic coil 10.
2, 102 is inactive when not energized, it is closed as shown in an enlarged view in FIG. 4, and when energized, the plunger 105 is attracted to the core 103 and opens. The operating stroke of the valve mechanism 114, 114 in this solenoid valve is the stopper 1.
08, 108 and the end surface of the core, and the gap between the plungers 105, 105 and the core 103 when they are not in operation is the gap a shown in FIG.

Plug 106, 106, seat 113, 11
3. Stopper 108, 108, Rod 122, 1
Holes 106a and 113 are provided in each axis of 22, respectively.
a, 108a, 122a are bored, and the plungers 105, 105 are provided with an axial passage 10 on the outer peripheral surface.
5a and an internal passage 105b are formed,
Furthermore, the plug 106 on the left side of the figure is provided with a passage 106b that connects to a wheel cylinder (not shown), and each of these holes 106a, 113a, 108a,
122a, passages 105a, 105b, 106b, etc. are passages for brake oil. Note that O-rings 115, 115, 116, 116, 117, 1 are provided between the sleeves 104, 104 and the core 103, and between the rings 120, 120 and the sleeves 103, 103 and the plugs 106, 106, respectively.
17 is interposed to maintain liquid tightness.

In this solenoid valve as well, in order to stabilize the response speed and secure the flow path, it is necessary to regulate the gap a and the operating stroke b with high precision during non-operation. , 113 while press-fitting, the gap a and stroke b are set to predetermined values. In this case, first the stopper 108,1
08 is press-fitted into the hole of the plunger 105, 105, and adjusted so that it protrudes from the end face of the plunger 105, 105 by a predetermined amount. Next, the valve mechanism 11
4,114 operating stroke b, that is, the core 103 side end surface of the stoppers 108, 108 and the core 103
The sheets 113, 113 are attached to the plugs 106, 106 while adjusting the distance from the end face to a predetermined value.
Press fit into the hole and secure. As a result, the gap a during non-operation is determined by the amount of protrusion of the stoppers 108, 108 from the plungers 105, 105 and the value of the operating stroke b. Note that, as in the case of FIG. 1, liquid tightness is maintained between the sheets 113, 113 and the plugs 106, 106. Also in this embodiment, the stopper 10
Since the sheets 8, 108 and the sheets 113, 113 are adjusted and fixed by press fitting, the same effects as in the above embodiment can be obtained.

In particular, in the present invention, since the stopper and the seat are adjusted and fixed by press-fitting means, for example, compared to fixing means by screwing, thread processing is not required, and workability is not only improved. ,
There is no need to provide a sealing member at the joint, the number of parts can be reduced, the seat and stopper can be made smaller, and the concentricity of the seat is better compared to screwing means, resulting in liquid tightness between the valve body and the seat. It has the effect of contributing to the improvement of

〔Effect of the invention〕

As described above, according to the present invention, the valve body is movably housed in the plunger and held by a spring, so that the operating stroke when the valve mechanism is opened is larger than the operating stroke when the valve is opened. You can take it. Further, it becomes possible to absorb dimensional errors in the axial direction due to processing of parts for adjusting and press-fitting the stopper and seat, thereby improving performance and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an example of a solenoid valve adjusted by the method of the present invention, FIG. 2 is a partially enlarged sectional view of FIG. 1, and FIG. 3 is a vertical sectional view showing another example of the solenoid valve. FIG. 4 is a partially enlarged sectional view of FIG. 3. 1,101: Main body, 2,102: Coil, 3,
103: Core, 5,105: Plunger, 6,1
06: Plug, 8,108: Stopper, 9,10
9: Valve body, 13, 113: Seat, 14, 11
4: Valve mechanism, a: gap when not operating, b: operating stroke.

Claims (1)

[Claims] 1 A core provided in a main body and around which an electromagnetic coil is wound, a plunger that is slidably accommodated in the main body and is attracted to the core when the core is excited, and a plunger arranged outside the plunger. A solenoid valve comprising: a plug installed and fixed to a main body; a valve mechanism consisting of a valve body and a seat that opens and closes by advancing and retracting the plunger; and a stopper regulating the limit of movement of the plunger when the valve mechanism is opened. , the valve body is housed in a plunger and movably held by a spring, so that the operating stroke when the valve mechanism opens is larger than the operating stroke when closing the valve; After the stopper is press-fitted by a predetermined amount into a hole formed in either the core, the plunger, or the plug, the sheet is press-fitted by a predetermined amount into the hole formed in the core or the plug in a liquid-tight manner. A press-fit adjustment method for a solenoid valve, characterized in that the gap between the plunger and the core when the plunger is not in operation and the operating stroke when the valve mechanism is closed are respectively set to different predetermined values.