JP5673189B2 - Valve device - Google Patents

Description

  The present invention relates to a hydraulic pressure control valve device employed in a brake hydraulic pressure control device or the like.

  Among known brake hydraulic pressure control devices, there is one that increases and decreases the hydraulic pressure of the wheel cylinder with a linear solenoid valve. Unlike a so-called on / off solenoid valve that alternately turns on and off energization, a linear solenoid valve is a valve in which the valve opening is linearly adjusted according to the magnitude of the drive current. Linear adjustment is possible.

  The linear solenoid valve includes a normally open type and a normally closed type, both of which have a valve body that reciprocates integrally with a plunger (movable iron core).

  This linear solenoid valve attracts the plunger with the magnetic force generated in the stator core (fixed iron core) by energizing the coil, and changes the strength of the magnetic force to change the distance from the valve seat to the valve body (valve valve The amount of separation from the seat) is increased or decreased to change the valve opening.

  At this time, if the valve body is in the middle of the stroke, that is, if the valve body is in an unstable state separated from the valve seat and other axial movement restricting members, the liquid acting around the valve body When the pressure balance is lost, radial valve body vibration is likely to occur, and as a result, operating noise is likely to occur.

  This problem is likely to occur when a large hydraulic pressure difference acts on the valve body when the valve is open.

  Therefore, as a countermeasure against the problem, Patent Document 1 described below is interposed between a retainer that is urged by a spring and pressed against the stator core, an O-ring that is held inside the retainer, and the O-ring and the stator core. It has been proposed to suppress the vibration of the valve body by providing a holding cylinder for fixing the retainer and fitting the O-ring on a connecting rod between the plunger (movable iron core) and the valve body.

  Further, in Patent Document 2 described below, a cylindrical elastic support member is inserted into a stator core, and a connecting rod between a plunger and a valve body is guided by a resin ring fitted inside the elastic support member. It has been proposed to suppress body vibration.

JP-A-8-4935 Japanese Patent Application Laid-Open No. 9-14483

  The countermeasures of Patent Documents 1 and 2 have a large number of parts used for suppressing vibration of the valve body, and the productivity of the solenoid valve is poor. Further, since the rod is positioned by the O-ring that generates the frictional resistance, the operation of the valve body is adversely affected.

  The present invention has been made in view of the above, and easily vibrates a valve body of a valve device that opens and closes a valve portion and adjusts an opening degree by bringing a valve body driven by a plunger into contact with and separating from a valve seat. The object is to suppress the operation noise caused by the vibration of the valve body of the valve device, which is suppressed by the structure.

In order to solve the above problems, in the present invention,
In a valve device comprising a valve seat facing the valve chamber, a valve body provided in the valve chamber and brought into contact with and separated from the valve seat, and a plunger for driving the valve body that reciprocates integrally with the valve body,
A coil spring is provided with one end held by a valve seat forming member provided with the valve seat and the other end abutting against a valve chamber side end surface of the valve seat forming member. Was provided with an outer diameter guide portion, and the outer diameter guide portion was brought into contact with the outer periphery of the plunger. In addition, the plunger said here also includes the connecting rod of a plunger and a valve body.

Preferred embodiments and specific embodiments of the valve device are listed below.
(1) An axial middle portion of the coil spring has a smaller diameter than both axial end portions, and the small diameter portion serves as the outer diameter guide portion.

(2) The coil springs have the same diameter at one end and the other end, and the diameter change from one end to the axial middle point and the diameter change from the other end to the axial middle point are symmetrically generated. .

(3) A cylindrical portion concentric with the valve seat is formed around the valve chamber side end surface of the valve seat forming member, and one end of the coil spring is inserted inside the cylindrical portion, and the one end is inserted into the cylindrical portion. Positioned coaxially with the valve seat on the inner peripheral surface.

(4) The contact point of the outer diameter guide portion with respect to the outer periphery of the plunger is more than a virtual straight line connecting the valve port center of the valve seat and the center of the flow channel port opened to the inner peripheral surface of the valve chamber. Set at a position away from.
(5) A return spring for returning the plunger to the initial position is provided, and the return spring biases the plunger and the valve body in the valve closing direction or the valve opening direction.

(6) The member facing the valve chamber side end surface of the valve seat forming member is the plunger, the other end of the coil spring abuts on the plunger, and the return spring has an initial load of the initial load of the coil spring. And the return spring biases the plunger in the valve closing direction so as to oppose the plunger biasing direction by the coil spring.

(7) The member facing the valve chamber side end surface of the valve seat forming member is a stator core of an electromagnetic valve that causes a magnetic attractive force to act on the plunger, and the other end of the coil spring contacts the stator core, The stator core is urged in the valve closing direction by the magnetic attractive force of the stator core, and the return spring urges the plunger in the valve opening direction.

(8) The member facing the valve chamber side end surface of the valve seat forming member is the plunger, the other end of the coil spring abuts on the plunger, and the plunger is a stator core of an electromagnetic valve that acts on the plunger. Arranged so as to be biased in the valve closing direction by a magnetic attractive force, the return spring is constituted by the coil spring, and the coil spring biases the plunger in the valve opening direction.

  In the valve device according to the present invention, one end is coaxially positioned with the valve seat and is held by the valve seat forming member, and the other end is abutted against a member facing the valve chamber side end surface of the valve seat forming member. The outer diameter guide portion provided in the coil spring is in contact with the outer periphery of a plunger that moves integrally with the valve body (in this invention, the connecting rod that connects the plunger and the valve body is also regarded as a part of the plunger). Therefore, the vibration in the radial direction of the valve body, and thus the generation of the operating noise of the valve device due to this is suppressed.

  Since the vibration suppression of the valve body can be performed with one coil spring, the productivity is good. Further, the frictional resistance generated at the contact point of the outer diameter guide portion is smaller than the vibration suppression by the O-ring, and the operation of the valve body is not hindered.

  A trapezoidal coil spring with one end having a large diameter and the other end having a small diameter is provided in place of the coil spring that brings the outer diameter guide portion in the axial direction into contact with the outer periphery of the plunger. A certain degree of vibration suppressing effect can be expected even by a method of holding the forming member and locking the small diameter end to the outer periphery of the plunger.

  In this case, for example, a surface facing the valve chamber side end surface of the valve seat forming member is provided on the outer periphery of the plunger, and the trapezoidal coil spring is connected to the valve seat forming member by abutting the small diameter end of the trapezoidal coil spring on this surface. It can be held between the plunger. However, when the small-diameter end of the trapezoidal coil spring that locks the outer periphery of the plunger is set at the same position as the outer diameter guide portion of the present invention in the axial direction, the trapezoidal coil spring naturally has a total length longer than that of the coil spring of the present invention. Shorter.

  Therefore, when the trapezoidal coil spring compressed by the reciprocating motion of the plunger and the coil spring of the present invention are compared, both different lengths are compressed by the same stroke, so the gap between the coil wire members constituting each is The trapezoidal coil spring is narrower than the coil spring of the present invention. Thereby, in the case of a trapezoidal coil spring, the flow resistance when the liquid passes through the gap between the coil wires becomes large.

  If the overall length of the trapezoidal coil spring is extended to the same length as that of the coil spring of the present invention in order to reduce this flow resistance, the location where the plunger is locked by the small diameter portion of the trapezoidal coil spring is outside the scope of the present invention. It will be separated from the valve seat forming member rather than the diameter guide portion, and the effect of suppressing vibration in the radial direction of the valve body will be reduced.

  The coil spring used in the present invention suppresses the vibration in the radial direction of the valve body by bringing the outer diameter guide portion provided in the middle of the axial direction into contact with the outer periphery of the plunger. Absent.

  The operational effects such as the preferred modes will be described in detail later.

Sectional drawing which shows an example of the valve apparatus of this invention Sectional drawing which expands and shows a part of solenoid valve of FIG. 1 is an enlarged cross-sectional view of a coil spring provided in the solenoid valve of FIG. Sectional drawing which shows the other form of the outer diameter guide part provided in a coil spring Sectional drawing which shows the other example of the valve apparatus of this invention Sectional drawing which shows the further another example of the valve apparatus of this invention

  Embodiments of the valve device according to the present invention will be described below with reference to FIGS. The valve device of FIG. 1 is for pressure reduction and is configured by assembling a normally closed linear electromagnetic valve 2 to a valve block 1.

  The linear solenoid valve 2 has a guide sleeve 3 incorporated in a bore formed in the valve block 1 and a valve seat forming member 4 press-fitted and fixed to one end side of the guide sleeve 3. A valve seat 5 is formed on the end face on the valve chamber side.

  A plunger (movable iron core) 6 is inserted in the other end side of the guide sleeve 3 so as to be slidable in the axial direction, and a valve chamber 7 is formed between the plunger 6 and the valve seat forming member 4. A valve body 8 for contacting and separating from the seat 5 is disposed.

  The valve body 8 is provided in a valve chamber side small diameter portion 6 a that is processed separately from the large diameter portion of the plunger 6 and joined to the large diameter portion, and reciprocates in the axial direction integrally with the plunger 6. . A stator core (fixed iron core) 10 is connected to the other end of the guide sleeve 3 via a nonmagnetic piece 9, and is wound around a bobbin in a region extending from the outer periphery of the stator core 10 to the outer periphery of the other small diameter portion of the guide sleeve 3. A coil 11 is arranged.

  The outside of the coil 11 is covered with a bottomed cylindrical case (yoke) 12, and a magnetic ring 13 is interposed between the large diameter portion of the guide sleeve 3 and the case 12.

  Further, between the plunger 6 and the stator core 10, an adsorption preventing pin 14 for preventing the plunger 6 from being adsorbed to the stator core 10 by magnetic force and a return spring 15 for urging the plunger 6 in the valve closing direction are installed. Yes.

  16 is a communication hole provided in the plunger 6 for the purpose of communicating with the valve chamber the chamber facing the counter valve chamber side end surface of the plunger 6, 17 is a flow path port formed in the guide sleeve 3, and 18 is the valve block 1. The flow path on the fluid introduction side processed into the valve block 19, the flow path on the fluid outflow side processed into the valve block 1, the filter disposed at the outlet of the flow path port 17, and 21 in the middle of the flow path 18. The filter 22 is a power supply terminal for the coil 11.

  The flow path 18 and the valve chamber 7 communicate with each other via a connection flow path 24 having an orifice 23 formed inside the guide sleeve 3. Further, the valve seat 5 faces the valve chamber 7, and the flow path port 17 is opened on the inner peripheral surface of the valve chamber 7. In addition, the arrow of FIG. 1 represents the flow direction of the fluid at the time of valve opening (and so on).

  The above configuration is not different from conventional products. That is, in the valve device of FIG. 1, the coil spring 25 is disposed between the plunger 6 and the valve seat forming member 4, and the outer diameter guide portion 25 a provided on the coil spring 25 is used as the valve chamber side small diameter portion 6 a of the plunger 6. The vibration in the radial direction of the valve body 8 is suppressed by contacting the outer periphery of the valve body 8, and this is the feature of the present invention.

  A cylindrical portion 26 concentric with the valve seat 5 is formed on the outer periphery of the valve chamber side end surface of the valve seat forming member 4. One end of the coil spring 25 is inserted inside the cylindrical portion 26, and one end thereof is positioned on the inner peripheral surface of the cylindrical portion 26 and held by the valve seat forming member 4. Further, the other end of the coil spring 25 is brought into contact with the valve chamber side end surface of the large diameter portion of the plunger 6.

  As described above, when one end of the coil spring 25 is positioned by the cylindrical portion 26 concentric with the valve seat 5, the centering accuracy of one end of the coil spring 25 can be increased. If the coil spring 25 is positioned concentrically with the valve seat 5, the valve body 8 is also held concentrically with the valve seat 5, and the balance of the hydraulic pressure acting around the valve body is unlikely to be disrupted. It can be expected that the effects of suppression of body radial vibration and suppression of operating noise are further enhanced.

  Further, in this structure, since the force of the coil spring 25 acts on the plunger 6 in the valve opening direction, the initial load of the return spring 15 is set larger than the initial load of the coil spring 25 to close the spring by the return spring 15. Enabling the valve.

  As shown in FIG. 3, the coil spring 25 provided in the valve device of FIG. 1 has an axially intermediate portion having a smaller diameter than both axial end portions, and this small diameter portion serves as an outer diameter guide portion 25a. When this coil spring 25 is used, the radial vibration of the valve body 8 can be suppressed only by the coil spring 25, and productivity deterioration and cost increase due to an increase in the number of parts can be suppressed.

  As shown in FIG. 3, the coil spring 25 has the same diameter at one end and the other end. Further, the diameter change from one end of the spring to the axial midpoint and the diameter change from the other end to the axial midpoint. If a product that is generated symmetrically is used, the directionality during assembly is lost and assembly errors do not occur. In addition, since the contact area of the outer diameter guide portion 25a with the plunger 6 is reduced, there is no adverse effect on the operation of the valve body.

  The contact point P of the outer diameter guide portion 25a shown in FIG. 2 with respect to the plunger 6 is an imaginary connection between the valve port center M1c of the valve seat 5 and the opening center M2c of the flow channel port 17 on the valve chamber side as shown in the figure. It is better to set the position away from the valve seat 5 than the straight line BSL. In the case of satisfying this condition, the flow path from the valve seat 5 to the flow path port 17 is not blocked by the outer diameter guide portion 25a in which the radial gap between the coil spring 25 and the plunger 6 is minimized, and the pressure reduction control is performed. The increase in the movement resistance of the fluid that flows out is suppressed.

  As shown in FIG. 4, the valve chamber side small diameter portion 6 a in contact with the inner side (outer diameter guide portion 25 a) of the coil spring 25 in the plunger 6 is formed in a barrel shape (the outer diameter of the middle portion in the axial direction is set at both ends. The coil spring 25 used in this state may be one that does not change in diameter (having a constant inner diameter over the entire area in the axial direction).

  FIG. 5 shows an example in which the present invention is applied to a valve device for pressure increase. The valve device of FIG. 5 is configured by assembling a normally open linear electromagnetic valve 2 to a valve block 1. In the linear electromagnetic valve 2 employed in the valve device of FIG. 5, a stator core 10 for applying a magnetic attractive force to the plunger 6 is incorporated in the bore of the valve block 1 and used as a guide sleeve.

  Further, the plunger 6 that drives the valve body 8 is disposed at a position facing the end surface on the side opposite to the liquid chamber of the stator core 10, and the outer periphery of the stator core 10 is covered with a bottomed sleeve 27. Further, a return spring 15 is disposed between the stator core 10 and the plunger 6 to return the valve body 8 to the valve open position when the coil 11 is not energized, and the stator core 10 is interposed between the plunger 6 and the valve body 8. They are connected by a connecting rod 28 (which is considered to be a part of the plunger).

  Further, a coil spring 25 whose one end is positioned by the cylindrical portion 26 and held by the valve seat forming member 4 and whose other end is in contact with the stator core 10 is housed in the valve chamber 7, and the axial direction of the coil spring 25 is An outer diameter guide portion 25 a provided at the intermediate point is brought into contact with the outer periphery of the connecting rod 28 to prevent radial deflection of the connecting rod 28, whereby the valve body provided at the end of the connecting rod 28. 8 radial vibration is suppressed.

  Also in this example, the outer diameter guide portion 25a is formed with a small diameter portion with the axial middle portion of the coil spring 25 having a small diameter. However, as shown in FIG. 4, a part of the outer periphery of the connecting rod 28 is expanded into a barrel shape. The outer periphery may be brought into contact with the inner diameter surface of the coil spring having a constant diameter.

  5 has the other end of the coil spring 25 in contact with the stator core 10, and therefore a return spring 15 different from the coil spring 25 is provided, and the return spring 15 attaches the plunger 6 in the valve opening direction. However, the plunger 6 can be returned to the initial position only by the force of the coil spring 25 with the structure shown in FIG.

  In the electromagnetic valve 2 of FIG. 6, a step portion 6b facing the valve chamber 7 is formed integrally with the valve chamber side small diameter portion 6a of the plunger 6 guided by the guide sleeve 3, and the other end of the coil spring 25 is formed on the step portion 6b. Are in contact.

  One end of the coil spring 25 is supported on the valve chamber side end surface of the valve seat forming member 4, and the outer diameter guide portion 25 a of the coil spring 25 is valved more than the step portion 6 b of the valve chamber side small diameter portion 6 a of the plunger 6. The vibration in the radial direction of the valve body 8 is suppressed by contacting a portion where the outer diameter on the chamber side is further reduced.

  According to the structure of FIG. 6, the coil spring 25 that suppresses the radial vibration of the valve body also serves as a return spring that returns the plunger 6 to the initial position, so that a dedicated return spring can be omitted.

  The other parts of the solenoid valve shown in FIG. 6 are composed of members common to those shown in FIGS. Therefore, the same reference numerals as in FIGS. 1 and 5 are attached to the common members, and the description is omitted.

  Although all the explanations here have been made taking a linear electromagnetic valve as an example, the present invention is a check that is performed by a difference in fluid pressure that acts on the valve body in opposition to the valve body. The present invention can also be applied to non-electromagnetic valve devices such as valves. In the valve device other than the linear solenoid valve, the valve body may vibrate in the radial direction due to the fluid pressure. By applying the present invention, it is possible to suppress the vibration and the operation sound caused thereby.

DESCRIPTION OF SYMBOLS 1 Valve block 2 Linear solenoid valve 3 Guide sleeve 4 Valve seat formation member 5 Valve seat 6 Plunger 6a Valve chamber side small diameter part 6b Step part 7 Valve chamber 8 Valve body 9 Nonmagnetic piece 10 Stator core 11 Coil 12 Case 13 Magnetic ring 14 Adsorption prevention pin 15 Return spring 16 Communication hole 17 Channel port 18 Fluid introduction side channel 19 Fluid outflow side channel 20, 21 Filter 22 Terminal 23 Orifice 24 Connection channel 25 Coil spring 25a Outer diameter guide portion 26 Cylindrical portion 27 Bottomed sleeve 28 Connecting rod P Contact point of the outer diameter guide portion with respect to the plunger M1c Valve seat center M2c Valve chamber side opening center BSL of the flow passage port Valve center of the valve seat and valve chamber side opening center of the flow passage port Virtual straight line to connect

Claims (9)

A valve seat (5) facing the valve chamber (7), a valve body (8) provided in the valve chamber (7) to contact and separate from the valve seat (5), and the valve body (8) In the valve device provided with the plunger (6) for driving the valve body that reciprocally moves reciprocally,
A coil spring having one end held by the valve seat forming member (4) provided with the valve seat (5) and the other end abutting against a member facing the valve chamber side end surface of the valve seat forming member (4) 25), an outer diameter guide part (25a) is provided in the axial direction of the coil spring (25), and the outer diameter guide part (25a) is brought into contact with the outer periphery of the plunger (6). And valve device.   The valve device according to claim 1, wherein an axially intermediate portion of the coil spring (25) has a smaller diameter than both axial end portions, and the small diameter portion serves as the outer diameter guide portion (25a).   The coil spring (25) has one end and the other end having the same diameter, and a change in diameter from one end of the spring to the axial intermediate point and a change in diameter from the other end to the axial intermediate point are generated symmetrically. The valve device according to claim 1 or 2, wherein   A cylindrical portion (26) concentric with the valve seat (5) is formed around the valve chamber side end surface of the valve seat forming member (4), and the coil spring (25) is formed inside the cylindrical portion (26). The valve device according to any one of claims 1 to 3, wherein one end is inserted and the one end is positioned coaxially with the valve seat on the inner peripheral surface of the cylindrical portion (26).   Contact points (P) of the outer diameter guide portion (25a) with respect to the outer periphery of the plunger (6) are opened at the valve port center (M1c) of the valve seat (5) and the inner peripheral surface of the valve chamber (7). The valve according to any one of claims 1 to 4, wherein the valve is set at a position farther from the valve seat (5) than a virtual straight line (BSL) that connects the center (M2c) of the flow passage opening (17) to the valve chamber side. apparatus.   A return spring (15 and / or 25) for returning the plunger (6) to an initial position is provided, and the return spring (15 and / or 25) closes the plunger (6) and the valve body (8) in the valve closing direction or The valve device according to any one of claims 1 to 5, wherein the valve device is biased in the valve opening direction.   The member facing the valve chamber side end surface of the valve seat forming member (4) is the plunger (6), and the other end of the coil spring (25) is in contact with the plunger (6), and the return spring (15 ), The initial load is larger than the initial load of the coil spring (25), and the return spring (15) faces the plunger biasing direction by the coil spring (25) to close the plunger (6) in the valve closing direction. The valve device according to claim 6, wherein the valve device is biased.   A member facing the valve chamber side end surface of the valve seat forming member (4) is a stator core (10) of an electromagnetic valve that applies a magnetic attractive force to the plunger (6), and the coil spring ( 25) is in contact with the other end, and the plunger (6) is arranged to be biased in the valve closing direction by the magnetic attractive force of the stator core (10), and the return spring (15) The valve device according to claim 6, wherein 6) is biased in the valve opening direction.   The member facing the valve chamber side end face of the valve seat forming member (4) is the plunger (6), and the other end of the coil spring (25) abuts on the plunger (6), and the plunger (6) Is arranged so as to be urged in the valve closing direction by the magnetic attractive force of the stator core (10) of the electromagnetic valve acting on the plunger (6), and the return spring is constituted by the coil spring (25). The valve device according to claim 6, wherein a coil spring (25) biases the plunger (6) in the valve opening direction.

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