JP4764838B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve including a retainer that moves integrally with a valve body.

  Generally, an electromagnetic valve is appropriately provided in a device that controls the flow of fluid, such as an antilock brake device for a vehicle. As such an electromagnetic valve, conventionally, a movable core that presses the valve body through a rod-shaped retainer, a valve seat member that blocks a flow path by contact with the valve body, a valve body, a retainer, and a movable core are provided. The thing provided with the spring for making it advance and retract with respect to a valve seat member, a fixed core, and a coil is known (refer to patent documents 1).

  Specifically, in the electromagnetic valve disclosed in Patent Document 1, the upper portion of the valve body is press-fitted into a recess formed at the lower end of the retainer, and a movable core having a larger diameter than the retainer is disposed above the retainer. Yes. The retainer is guided by a substantially cylindrical fixed core so as to be slidable in the vertical direction, and a spring is disposed between the valve body and the valve seat member.

  In such a solenoid valve, when a current is supplied to the coil, the retainer moves downward while sliding on the inner surface of the fixed core by the movable core attracted to the excited fixed core, and is provided at the lower end of the retainer. A flow path is obstruct | occluded because a valve body contact | abuts to a valve seat surface. When the supply of current is interrupted, the valve body is pushed upward by the biasing force of the spring, so that the valve body is separated from the valve seat surface and the flow path is opened. At this time, the retainer pressed by the spring via the valve body moves upward while sliding on the inner surface of the fixed core again, and returns to the original position.

JP-T-2004-505217

  However, in the above-described technique, since the upper part of the valve body is press-fitted into the recess at the lower end of the retainer, the outer diameter of the retainer near the recess is slightly increased. Then, when the vicinity of the concave portion of the retainer swells outward as described above, the slidability of the retainer with respect to the fixed core may be deteriorated.

  Such slidability of the retainer is considered to be a problem even when, for example, the electromagnetic valve is caulked and fixed to the base. That is, when a groove is provided on the outer peripheral surface of the fixed core, and a part of the base is deformed and inserted into the groove, a sliding surface with the retainer is formed on the radially inner side of the groove. The sliding surface may bulge inward, which may deteriorate the sliding performance of the retainer.

  Then, this invention makes it a subject to provide the solenoid valve which can keep the slidability of a retainer favorable.

The present invention that solves the above-mentioned problems is operated by moving the movable core, a coil that moves the movable core by magnetic force when an electric current flows, a valve seat member having a valve seat surface, and moving forward and backward with respect to the valve seat surface. a valve body for opening and closing a flow path of the liquid, together with the provided at one end of the press-fit portion into which the valve body is pressed, the movable core operates integrally with the movable core in contact with the other end, and the movable core the movable core by the possess a retainer which is formed separately, the through hole for slidably guiding the retainer, and face the movable core in the direction of movement of the movable core, energization of the coil A fixed core that attracts the fixed core, and the fixed core has an inner diameter larger than the through-hole around the press-fit portion of the retainer, thereby preventing interference between the press-fit portion and the fixed core. both to have a clearance portion for preventing A groove is formed in the outer peripheral portion, and a part of the base is caulked inward in the radial direction to be fixed to the base, and the groove is provided at a position overlapping the escape portion in the radial direction. It is characterized by being.

According to the present invention, since the escape portion for preventing the interference between the press-fit portion and the fixed core is provided around the press-fit portion of the retainer, the press-fit portion of the retainer is deformed radially outward by press-fitting the valve body. However, the deformed press-fit portion is released by the escape portion. In other words, since the retainer is always guided by the fixed core except for the press-fitted portion that is deformed by the press-fitting of the valve body, the deformed press-fitted portion and the fixed core do not interfere with each other, and the retainer slides. The property can be kept good. And since the escape part should just be formed in the fixed core larger than a retainer, the manufacture becomes easy, without making a retainer into a complicated shape. Further, even when the inner peripheral surface of the fixed core is deformed so as to bulge inward when a portion of the base is caulked against the groove, the bulged portion is absorbed by the escape portion. . Therefore, this bulged portion does not interfere with the retainer, and the slidability of the retainer can be kept good.

The groove is preferably provided at a position overlapping the press-fit portion in the radial direction.

  Further, it is desirable that the escape portion is formed to the other end side rather than the end portion on the other end side of the press-fitting portion when the retainer is located at the open position.

  Furthermore, it is desirable that the end portion on the one end side of the escape portion is connected to a valve chamber having a larger diameter than the escape portion.

  According to this, even if the retainer moves up and down, interference between the press-fit portion and the fixed core is reliably prevented.

According to the present invention, since the escape portion for preventing interference between the retainer and the fixed core is provided inside the groove of the fixed core where a part of the base body is caulked, the slidability of the retainer can be kept good. it can. Further, the retainer can be easily manufactured without making it into a complicated shape.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a longitudinal sectional view showing a normally open solenoid valve according to an embodiment. In the following description, after describing the basic structure of the normally open solenoid valve 1, the structure of the characteristic part of the present invention will be described in detail.

As shown in FIG. 1, the normally open electromagnetic valve 1 is a valve for switching between closing and opening of a flow path R formed in a base B such as an antilock brake device, and mainly includes a fixed core 3, a coil The unit 4 includes a valve body 5, a valve seat member 6, and a movable core 7.
In the normally open electromagnetic valve 1, the valve body 5 is normally separated from the valve seat member 6 and is connected at the side from the flow path R1 connected downward (for convenience, the upper and lower sides are based on FIG. 1). The flow of the hydraulic fluid to the flow path R2 is allowed. When the valve element 5 comes into contact with the valve seat member 6 by energization of the coil unit 4, the flow path R is closed and the flow of hydraulic fluid is blocked. Further, in the normally open solenoid valve 1 of the present embodiment, when the difference between the pressure of the hydraulic fluid in the flow path R1 and the pressure of the hydraulic fluid in the flow path R2 is a predetermined value or more, the hydraulic fluid due to the pressure difference This overcomes the valve closing force acting on the valve body 5 so that the flow path R is opened. That is, the normally open solenoid valve 1 is a linear solenoid valve (differential pressure control valve) that can control the closing force of the valve body 5 in accordance with the value of the current supplied to the coil unit 4.

The fixed core 3 (guide member) also serves as a housing for accommodating the components is a cylindrical member having a penetrating vertically hole. The fixed core 3 includes a body part 31 attached to the base B and a core part 32 that is formed with an outer diameter narrower than the body part 31 and extends upward. Inside the body part 31, the valve body 5 and the valve seat member 6 are accommodated.

  The valve body 5 is formed with a hemispherical seal portion 51 at the tip, and a cylindrical shaft portion 52 is connected to the seal portion 51. A large-diameter portion 53 having a larger diameter than the shaft portion 52 is formed on the shaft portion 52, and the shaft portion 52 and the large-diameter portion 53 are connected by a diameter-enlarged portion 52a having a tapered shape. That is, the diameter gradually increases from the shaft portion 52 toward the large diameter portion 53. On the large-diameter portion 53, a flange portion 54 having a larger diameter is provided. On the flange portion 54, a connection pin 55 is formed extending upward.

The valve seat member 6 is a flat columnar member. A funnel-shaped valve seat surface 61 is formed at the center of the upper surface, and an inflow passage 62 penetrating vertically from the bottom of the valve seat surface 61 is formed. . The inflow passage 62 is a passage through which hydraulic fluid flows into the valve chamber 84 above the valve seat member 6 from below the normally open electromagnetic valve 1. Further, the valve seat member 6 is formed with a return flow path 63 penetrating vertically at a position shifted radially outward from the inflow path 62. A ball valve 64 is disposed below the return flow path 63 and constitutes a check valve together with the return flow path 63. The ball valve 64 is prevented from falling off by a filter 83 that is press-fitted into the inner diameter of the lower end of the body portion 31.
Such a valve seat member 6 is press-fitted and fixed to the inner periphery of the body portion 31.

  Between the upper surface of the valve seat member 6 and the flange portion 54 of the valve body 5, a return spring 81 that generates a biasing force that separates the valve body 5 from the valve seat member 6 is disposed.

A plurality of through holes 33 are formed in the side wall of the body portion 31 to communicate the inside and outside of the body portion 31. A cylindrical filter 85 is fitted to the outside of the portion where the through hole 33 is disposed, and foreign matters in the working fluid passing through the through hole 33 are removed.
The body portion 31 is inserted into the mounting hole B1 of the base body B and fixed by caulking the periphery of the mounting hole B1 radially inward with respect to a groove 31a formed in the outer peripheral portion thereof. Moreover, the lower end of the body part 31 is press-fitted and fixed to a press-fitting part B2 formed in a small diameter in the mounting hole B1.

  In the core portion 32 (specifically, a portion extending from the upper end of the core portion 32 to the upper portion where the thickness of the body portion 31 is increased), a circular shape having a diameter with a minimum clearance for driving the retainer 56 is provided. A through hole 34 having a cross section is formed. A rod-like retainer 56 for operating the movable core 7 and the valve body 5 integrally is disposed in the through hole 34, and the retainer 56 is slidably guided by the through hole 34. It has become.

  The retainer 56 is formed with a bottomed cylindrical connection hole 57 on the lower end surface, and the connection pin 55 of the valve body 5 is press-fitted into the connection hole 57 so as to move integrally with the valve body 5. Since the retainer 56 is biased upward together with the valve body 5 by the return spring 81, the upper surface 58 of the retainer 56 is in contact with the lower end surface 71 of the movable core 7.

  A plurality of (only one shown) grooves 59 are formed on the side surface of the retainer 56 over the entire length. The groove 59 makes the movement of the retainer 56 smooth by allowing the hydraulic fluid above and below the retainer 56 to move when the retainer 56 moves up and down. The retainer 56 moves downward integrally with the movable core 7 when a movable core 7 described later is attracted to the fixed core 3 by magnetic force when the coil is energized, and the movable core 7 is moved by the return force of the return spring 81 when the coil energization is interrupted. 7 and move upward together.

  The upper end portion 35 of the core portion 32 has an inner diameter slightly larger than that of the through hole 34. The inner diameter is large enough to allow the convex portion 72 of the movable core 7 to be described later. That is, a concave portion 36 that can accommodate the tip of the convex portion 72 is formed on the upper surface of the core portion 32. The fixed core 3 is made of a magnetic material, and when excited by the coil unit 4, it functions to attract the movable core 7 and close the valve.

The movable core 7 is a columnar member made of a magnetic material disposed on the retainer 56. A groove 73 formed over the entire length is formed on the side surface of the movable core 7, and when the movable core 7 moves up and down, the working fluid above and below the movable core 7 can be moved to move the movable core 7. 7 movement is smooth.
The lower end surface 71 of the movable core 7 protrudes with a circular outline at the center to form a convex portion 72. As described above, the convex portion 72 faces the concave portion 36 on the upper surface of the fixed core 3 and is sized to enter the concave portion 36.

  A bottomed cylindrical guide tube 86 is fixed to the core portion 32 by fitting and welding. The movable core 7 is accommodated in the guide cylinder 86, and the vertical movement is guided.

  The coil unit 4 is configured by winding a coil 42 around a resin bobbin 41, and a yoke 43 that forms a magnetic path is disposed outside the bobbin 41.

Next, the structure around the connection hole 57 of the retainer 56, which is a feature of the present invention, will be described.
A relief portion 34 a having a diameter one size larger than that of the through hole 34 is formed on the thickened upper portion of the body portion 31. The escape portion 34a is around a portion (hereinafter referred to as “press-fit portion 57a”) in which at least the connection pin 55 of the valve body 5 is press-fitted in a cylindrical wall forming the connection hole 57 of the retainer 56 (hereinafter referred to as “press-fit portion 57a”). (Radially outward). Accordingly, even when the press-fit portion 57a bulges outward, the bulged press-fit portion 57a is released by the escape portion 34a, and interference between the press-fit portion 57a and the body portion 31 is prevented.

  Further, the escape portion 34a is formed so that the upper portion thereof is slightly above the upper end of the press-fit portion 57a of the retainer 56 located at the open position (the position in the figure), and the lower portion thereof has a larger diameter than the escape portion 34a. The valve chamber 84 is opened. Therefore, even if the retainer 56 moves up and down, interference between the press-fit portion 57a and the body portion 31 is prevented.

  Further, the relief portion 34a is provided at a position (substantially the same height in the axial direction) overlapping with the groove 31a formed in the outer peripheral portion of the body portion 31 in the radial direction. Thereby, even when the inner peripheral surface of the body portion 31 bulges inward when the periphery of the mounting hole B1 of the base body B is caulked toward the groove 31a, the bulged portion is escaped by the escape portion 34a. And the interference between the inner peripheral surface of the body portion 31 and the retainer 56 is prevented.

According to the above, the following effects can be obtained in the present embodiment.
By providing the escape portion 34 a around the press-fit portion 57 a of the retainer 56, the press-fit portion 57 a that bulges outward by press-fit is not released by the escape portion 34 a and interferes with the body portion 31. Slidability can be kept good.

  By providing the escape portion 34a and the groove 31a in a position overlapping in the radial direction, even if the inner peripheral surface of the body portion 31 bulges inward by caulking, the bulged portion escapes at the escape portion 34a. Therefore, the slidability of the retainer 56 can be kept better.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be implemented with appropriate modifications.

  In the above embodiment, the present invention is applied to the linear solenoid valve that changes the operating differential pressure according to the value of the current flowing through the coil 42, but a normally open solenoid valve that does not change the operating differential pressure may be used. . For example, FIG. 2 is a longitudinal sectional view of a normally open electromagnetic valve of another form.

  Only the portions of the normally open solenoid valve 1 ′ of FIG. 2 that are different from the normally open solenoid valve 1 of FIG. 1 will be described. The normally open solenoid valve 1 ′ does not have the convex portion 72 and the concave portion 36 provided in the above-described normally open solenoid valve 1, the lower end surface 71 of the movable core 7 is formed flat, and the upper end surface of the fixed core 3. Is also formed flat. In addition, an orifice 65 that restricts the inflow path 62 is disposed in the inflow path 62 formed at the center of the valve seat member 6.

  Also in such a normally open type electromagnetic valve 1 ′, a relief portion 34 a is provided around the press-fit portion 57 a of the retainer 56 and radially inward of the groove 31 a of the body portion 31, as in the above embodiment. Thus, the slidability of the retainer 56 can be kept good.

Further, the present invention is not limited to the normally open solenoid valve, but can be applied to a normally closed solenoid valve that is normally closed.
Although not shown, in the case of adopting a structure using the retainer 56 as shown in FIGS. 1 and 2 in a conventional normally closed solenoid valve, the above-described implementation is achieved by adopting the same structure as the above embodiment. The same effect as the form can be obtained.

It is a longitudinal section showing a normally open type electromagnetic valve concerning an embodiment. Ru longitudinal sectional view showing a normally open electromagnetic valve other forms.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Normally open type solenoid valve 3 Fixed core 5 Valve body 6 Valve seat member 7 Movable core 31 Body part 31a Groove 32 Core part 34 Through-hole 34a Escape part 42 Coil 55 Connection pin 56 Retainer 57 Connection hole 57a Press-fit part 61 Valve seat surface 81 Return spring B Base B1 Mounting hole R Flow path

Claims (4)

A movable core,
A coil that moves the movable core by a magnetic force when a current flows;
A valve seat member having a valve seat surface;
A valve body that moves forward and backward relative to the valve seat surface to open and close the flow path of the hydraulic fluid;
A retainer which is provided with a press-fitting portion into which the valve body is press-fitted at one end, the movable core abuts on the other end and operates integrally with the movable core, and is configured separately from the movable core ;
Have a through hole for slidably guiding the retainer, and face the movable core in the direction of movement of the movable core, an electromagnetic valve having a fixed core attracts a movable core by energization of the coil Because
The fixed core has an escape portion that prevents interference between the press-fit portion and the fixed core by forming an inner diameter larger than the through hole around the press-fit portion of the retainer, and a groove is formed in the outer peripheral portion. Is fixed to the base by caulking a part of the base in the groove toward the inside in the radial direction,
The electromagnetic valve according to claim 1, wherein the groove is provided at a position overlapping the relief portion in a radial direction .   The electromagnetic valve according to claim 1, wherein the groove is provided at a position overlapping the press-fitting portion in the radial direction.   The said escape part is formed in the said other end side rather than the edge part of the said other end side of the said press-fit part when the said retainer is located in an open position, The Claim 1 or Claim 2 characterized by the above-mentioned. The solenoid valve described.   The solenoid valve according to any one of claims 1 to 3, wherein the escape portion is connected to a valve chamber having an end on the one end side having a larger diameter than the escape portion. .

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