JP2014222076A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve in which a large change in an axial frictional force acting on a plunger before and after the valve-opening is suppressed.SOLUTION: A solenoid valve V21 includes; an inflow port 11; an outflow port 12; a passage 13; a valve seat 14; a valve port 15; a housing 10 having a guide hole 16; a plunger 20 which is housed in the housing 10, has at its one end a valve element 21 that can be seated and released on/from the valve seat 14, and which contacts with the guide hole 16 at an external periphery of the other end and can move to the axial direction; a spring 30 which is housed in the housing 20, and energizes the plunger 20 toward the valve seat 14; and a solenoid 40 which is assembled to the housing 10, and generates an attracting force which withstands a load of the spring 30 by electric power application. Between a contact region (P11) of the valve element 21 and the valve seat 14, and a contact region (P12) of the other end external periphery of the plunger 20 and the guide hole 16, a contact part (51) which can contact with the guide hole 16a when the valve element 21 is seated on the valve seat 14 is provided in the plunger 20.

Description

  The present invention relates to an electromagnetic valve, for example, an electromagnetic valve that is assembled in a hydraulic control device of a hydraulic brake device for a vehicle and used for hydraulic control of brake fluid (working fluid).

This type of solenoid valve is generally
An inflow port and an outflow port for the working liquid; a passage that communicates with the inflow port; a valve hole that is provided in the passage and has a valve seat formed at one end thereof; and A housing having a coaxial guide hole;
A plunger that is housed in the housing and has a valve body that can be seated and separated with respect to the valve seat at one end, and is movable in the axial direction in contact with the guide hole at the outer periphery of the other end;
A spring housed in the housing and biasing the plunger in the axial direction toward the valve seat;
A solenoid (electromagnetic coil) that is assembled to the housing and generates a suction force (electromagnetic force) against the load (biasing force) of the spring against the plunger by energization.
For example, it is shown by the following patent document 1.

JP 2011-2086 A

  In the electromagnetic valve described in the above-mentioned patent document 1, as schematically shown in FIGS. 14 to 16, the load is applied to the plunger 1 by the spring 6 (the force pressing the plunger 1 against the guide hole 2 a of the housing 2). ) To suppress the occurrence of hydraulic pulsation (self-excited vibration). However, if a sufficient unbalanced load cannot be obtained by the spring 6, FIG. As shown in FIG. 14, when the valve body 3 is seated on the valve seat 4 as shown in an exaggerated manner between the outer periphery of the plunger 1 and the guide hole 2a of the housing 2 in FIG. The valve body 3 and the valve seat 4 are in contact with each other at the first contact site P1 on one end side (lower side in FIG. 14) of the plunger 1, and the other end side (upper side in FIG. 14) of the plunger 1. The outer periphery of the other end of the plunger 1 and the guide hole 2a are the second contact site. It comes into contact at 2. As the solenoid 5 is energized, the state shown in FIG. 16 is shifted to the state shown in FIG. 16 against the urging force of the spring 6. In the state shown in FIG. 15, the valve body 3 slides with respect to the valve seat 4 while the valve body 3 and the valve seat 4 are in contact with each other at the first contact site P <b> 1. The plunger 1 slides in the axial direction with respect to the guide hole 2a while the outer periphery of the end and the guide hole 2a are in contact with each other at the second contact site P2.

  By the way, in the state shown in FIG. 16, the contact between the valve body 3 and the valve seat 4 at the first contact site P1 is released, and the outer periphery of the other end of the plunger 1 and the guide hole 2a are connected to the second contact site P2. The plunger 1 slides in the axial direction with respect to the guide hole 2a while the outer periphery of the one end of the plunger 1 and the guide hole 2a are in contact with each other even at the third contact site P3. At this time, electromagnetic force is generated between the plunger 1 and the guide hole 2a (between the housings 2), and the axial frictional force F acting on the plunger 1 is displaced by the displacement of the plunger 1, as shown in FIG. With increasing (axial displacement), it rapidly increases from Fo to F1. The frictional force (P1 frictional force) schematically indicated by the broken line in FIG. 17 is generated at the first contact site P1, and is schematically indicated by the dotted line in FIG. (Friction force of P2) is generated at the second contact site P2, and the friction force (friction force of P3) schematically shown by the two-dot chain line in FIG. 17 is the third contact site. It occurs at P3.

  For this reason, in the electromagnetic valve described in the above-mentioned patent document 1, the axial frictional force acting on the plunger with the change of the contact part (change from P1 and P2 to P2 and P3) before and after opening the valve. The (sliding resistance) changes abruptly, and a hydraulic pulsation that becomes a problem may occur along with this.

The present invention has been made to solve the above-described problems, and the solenoid valve of the present invention is
An inflow port and an outflow port for the working liquid; a passage that communicates with the inflow port; a valve hole that is provided in the passage and has a valve seat formed at one end thereof; and A housing having a coaxial guide hole;
A plunger that is housed in the housing and has a valve body that can be seated and separated with respect to the valve seat at one end, and is movable in the axial direction in contact with the guide hole at the outer periphery of the other end;
A spring housed in the housing and biasing the plunger in the axial direction toward the valve seat;
A solenoid that is assembled to the housing and generates a suction force against the load of the spring against the plunger by energization;
When the valve body is seated on the valve seat, the contact hole between the valve body and the valve seat, the outer periphery of the other end of the plunger and the contact hole of the guide hole, A contactable contact portion is provided on the plunger.

  In carrying out the above-described present invention, the contact portion may be provided on an outer peripheral portion of a ring member that is assembled to one end portion of the plunger so as to be movable in the radial direction. In this case, the valve body may be constituted by a member different from the plunger, and the ring member may be clamped in the axial direction by the valve body and the plunger.

  In the electromagnetic valve according to the present invention, when the valve body is seated on the valve seat, a contact portion (first contact portion) between the valve body and the valve seat, and an outer periphery of the other end portion of the plunger A contact portion that can contact the guide hole is provided on the plunger between the contact portion (second contact portion) of the guide hole. For this reason, when the solenoid valve is opened, the contact portion provided on the plunger contacts the guide hole until the valve element moves from the valve seat in the valve opening direction and is released from contact with the valve seat. Thus, an axial frictional force (sliding resistance) acts on the plunger at the third contact site. Therefore, in the solenoid valve of the present invention, it is possible to suppress a large change in the axial frictional force (sliding resistance) acting on the plunger before and after opening the valve. Can be suppressed.

  In carrying out the above-described present invention, the ring member may be formed to include a magnetic material. In this case, when the solenoid is energized, the outer peripheral portion (contact portion) of the ring member and the guide hole come into strong contact with each other by electromagnetic force, and a large frictional force is effectively obtained. In this case, the outer surface of the ring member in contact with the guide hole may be made of a nonmagnetic material. In this case, by appropriately selecting the material of the non-magnetic material constituting the outer surface of the ring member or the processing method of the outer surface (processing method for making the outer surface non-magnetic), the outer periphery of the ring member It is possible to control the frictional force obtained between the (contact portion) and the guide hole.

  Further, when the above-described present invention is implemented, when the valve body and the plunger are composed of separate members, a passage that allows the working liquid to flow in the axial direction is provided in the inner peripheral portion of the ring member. The plunger is provided with a through-hole that can communicate with the passage and allows the working liquid to flow in the axial direction, and is provided with a fixing portion that can fix the rotational phase of the passage and the through-hole. It is also possible. In this case, the fixing portion can be provided as a separate member from the valve body and the plunger, or can be provided integrally with the valve body or the plunger.

  In this case (when a fixing portion capable of fixing the rotational phase of the passage and the through hole is provided), a ring member is assembled to the plunger in a state where the rotational phases of the passage and the through hole are matched. It is possible to attach. Further, in this case, the rotation of the ring member relative to the plunger can be suppressed by the fixing portion, and the rotational phase shift between the passage and the through hole can be suppressed.

1 is a longitudinal cross-sectional view schematically showing a first embodiment of a solenoid valve according to the present invention. It is the longitudinal cross-sectional view which showed the operation state (at the time of valve opening start) of the solenoid valve shown in FIG. It is the longitudinal cross-sectional view which showed the operation state (at the time of completion | finish of valve opening) of the solenoid valve shown in FIG. FIG. 4 is a diagram schematically showing the relationship between the displacement (axial displacement of the plunger) obtained by the electromagnetic valve shown in FIGS. 1 to 3 and the frictional force (axial frictional force acting on the plunger). It is the longitudinal cross-sectional view which showed schematically 2nd Embodiment of the solenoid valve which concerns on this invention. It is a longitudinal cross-sectional view which showed the operation state (at the time of an energization start) of the solenoid valve shown in FIG. FIG. 7 is a longitudinal sectional view showing a modified embodiment of a plunger (including a valve body and a ring member) in the electromagnetic valve shown in FIGS. 5 and 6. It is the longitudinal cross-sectional view which showed 3rd Embodiment of the solenoid valve which concerns on this invention. FIG. 9 is an exploded perspective view of a plunger (including a valve body and a ring member) in the electromagnetic valve shown in FIG. 8. FIG. 10 is a front view of a single ring member shown in FIGS. 8 and 9. FIG. 10 is a perspective view showing a modified embodiment of the plunger (including a valve body and a ring member) shown in FIGS. 8 and 9. It is a disassembled perspective view of the plunger (a valve body and a ring member are shown) shown in FIG. FIG. 13 is a perspective view of a single valve body shown in FIGS. 11 and 12. It is the longitudinal cross-sectional view which showed schematically the solenoid valve of the prior art example. It is the longitudinal cross-sectional view which showed the operation state (at the time of valve opening start) of the solenoid valve shown in FIG. It is the longitudinal cross-sectional view which showed the operation state (at the time of completion | finish of valve opening) of the solenoid valve shown in FIG. FIG. 17 is a diagram schematically showing a relationship between displacement (plunger axial displacement) obtained by the electromagnetic valve shown in FIGS. 14 to 16 and frictional force (axial frictional force acting on the plunger).

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 schematically show a first embodiment of a solenoid valve according to the present invention. The solenoid valve V1 of this embodiment is assembled to a hydraulic control device of a hydraulic brake device for a vehicle, for example. And a normally closed solenoid valve used for controlling the hydraulic pressure of the brake fluid (working fluid). Further, in the electromagnetic valve V1, a plunger 20, a spring 30, a solenoid 40, and the like are assembled to the housing 10.

  The housing 10 accommodates a plunger 20, a spring 30, and the like therein, and has an inlet 11 and an outlet 12 for brake fluid, and a passage 13 for communicating these, and is provided in the passage 13 and has one end ( It has a valve hole 15 in which a valve seat 14 is formed on the upper end portion. The housing 10 includes a guide portion 10a and a fixed core portion 10b. The guide portion 10a is provided with a guide hole 16 coaxial with the valve hole 15. The fixed core portion 10b includes a spring 30. A spring accommodating hole 17 for accommodating the portion is provided.

  The housing 10 includes a first housing 10A provided with an outlet 12, a guide hole 16, and a spring accommodating hole 17, and a second housing 10B provided with an inlet 11, a valve seat 14, and a valve hole 15. The first housing 10 </ b> A is made of a magnetic material except for a portion that forms the upper end portion of the guide hole 16 (this portion is non-magnetic), and is configured to form a magnetic path with the plunger 20. .

  The plunger 20 includes a valve body 21 made of a non-magnetic material, and a movable core 22 made of a magnetic material and having a cylindrical shape. The valve body 21 has a valve portion 21 a that can be seated and separated from the valve seat 14. Further, the valve body 21 is fitted and fixed in a mounting hole (not shown in FIGS. 1 to 3) provided in the lower end portion axial center of FIG. 1 (the axial center of one end portion) of the movable core 22. And can be moved together. The movable core 22 is movable in the axial direction by contacting the guide hole 16 of the housing 10 on the outer periphery (a non-magnetic and thin sleeve S (see FIG. 7 is provided except for the upper end)). Is movable). A desired gap (exaggerated in FIGS. 1 to 3) is set between the outer periphery of the movable core 22 (plunger 20) and the housing 10 (guide portion 10a). The sliding property of the axial direction with respect to 10 is ensured, and the fluidity (flowability) of the brake fluid is ensured.

  The spring 30 is interposed between the housing 10 and the plunger 20 while being accommodated in the housing 10, and urges the plunger 20 in the axial direction toward the valve seat 14. The solenoid 40 is disposed outside the housing 10 as is well known. When the solenoid 40 is energized, a magnetic path (attraction force (electromagnetic force against the load of the spring 30 against the plunger 20) by the guide portion 10 a and the fixed core portion 10 b of the housing 10, the movable core 22 of the plunger 20, and the like. ) Is generated by energizing the solenoid 40).

  By the way, in this embodiment, the ring member 50 is assembled | attached to the lower end part (valve seat side edge part) of the movable core 22 in the plunger 20. FIG. The ring member 50 is assembled so as to be movable in the radial direction with respect to the plunger 20, and is in contact with the guide hole 16 at an outer peripheral portion (contact portion) 51. In this embodiment, the outer peripheral portion (contact portion) 51 and the guide hole 16 are set to contact each other even in the state of FIG. 1 (for example, the outer diameter of the ring member 50 is equal to or larger than the inner diameter of the guide hole 16). However, it is also possible to set the outer peripheral portion (contact portion) 51 and the guide hole 16 apart in the state of FIG.

  The outer peripheral portion (contact portion) 51 of the ring member 50 is configured such that when the valve portion 21 a of the valve body 21 is seated on the valve seat 14, the contact portion between the valve portion 21 a of the valve body 21 and the valve seat 14 (first Contact with the guide hole 16 at a contact portion (third contact portion) P13 between the contact portion) P11 and the outer periphery of the upper end of the movable core 22 and the contact portion (second contact portion) P12 of the guide hole 16 doing. Thereby, the outer peripheral part (contact part) 51 of the ring member 50 is in contact with the guide hole 16 when shifting from the state of FIG. 1 to the state of FIG. 3. When the state shown in FIG. 1 shifts from the state shown in FIG. 2 to the state shown in FIG. 3, the ring member 50 moves relative to the plunger 20 in the radial direction.

  Therefore, when the electromagnetic valve V1 is opened, the valve portion 21a of the valve body 21 moves from the valve seat 14 in the valve opening direction until the contact with the valve seat 14 is released (from the state of FIG. 1 to FIG. 3), the outer peripheral portion (contact portion) 51 of the ring member 50 provided in the plunger 20 contacts the guide hole 16, and the plunger 20 is pivoted to the plunger 20 at the third contact site P13. Directional frictional force (sliding resistance) acts.

  Therefore, in this electromagnetic valve V1, the axial frictional force (sliding resistance) F acting on the plunger 20 changes from F2 to F1 as shown by the solid line in FIG. Friction force obtained at the first contact site P11 (friction force obtained at the second contact site P12 (friction force of P12) and friction force obtained at the third contact site P13 (friction force of P13) ), The frictional force (the frictional force of P11)) is smaller). For this reason, it is possible to suppress a large change in the axial frictional force (sliding resistance) acting on the plunger 20 before and after the valve opening, and to suppress the occurrence of hydraulic pulsation accompanying the change. It is possible.

  Such an effect is also apparent by comparing the amount of change in the frictional force shown in FIG. 4 and the frictional force shown in FIG. Note that the frictional force schematically indicated by the broken line in FIG. 4 (the frictional force P11) is generated at the first contact site P11, and is indicated schematically by the dotted line in FIG. (Friction force of P12) is generated at the second contact site P12, and the frictional force schematically shown by the two-dot chain line in FIG. 4 (friction force of P13) is the third contact site. This occurs at P13.

  In the electromagnetic valve V1 of the first embodiment described above, the plunger 20 in the state of FIG. 1 where the valve portion 21a of the valve body 21 is seated on the valve seat 14 (same when the solenoid 40 is energized or not energized). The outer peripheral portion (contact portion) 51 of the ring member 50 provided on the outer periphery of the ring member 50 is set so as to contact the guide hole 16. However, the electromagnetic valve V2 of the second embodiment schematically shown in FIGS. It is also possible to configure and implement as described above.

  In the electromagnetic valve V2 of the second embodiment, when the solenoid 40 is in a non-energized state with the valve portion 21a of the valve body 21 seated on the valve seat 14, as shown in FIG. 6 is separated from the guide hole 16 and the movable core 22, and when the solenoid 40 is energized, the ring member 50 contacts the guide hole 16 and the movable core 22, as shown in FIG. It is also possible to set and implement so.

  When the solenoid 40 is energized, the ring member 50 comes into contact with the guide hole 16 and the movable core 22 because the ring member 50 moves in the axial direction and the radial direction by the electromagnetic force generated along with the energization. This is because the axial gap between the movable cores 22 and the radial gap between the ring member 50 and the guide hole 16 are eliminated. As a result, in the second embodiment, when the solenoid 40 is energized, the outer peripheral portion (contact portion) 51 of the ring member 50 and the guide hole 16 are in strong contact with each other by electromagnetic force, and a large frictional force is effectively obtained.

  In carrying out the second embodiment, the ring member 50 needs to be made of a magnetic material, but the frictional force at the portion where the outer peripheral portion (contact portion) 51 of the ring member 50 and the guide hole 16 come into contact is set small. If desired, as shown in FIG. 7, the outer surface of the outer peripheral portion (contact portion) 51 that contacts the guide hole 16 is implemented as a thin nonmagnetic layer (for example, a sleeve made of SUS or nonmagnetic resin). It is also possible to do. The nonmagnetic layer can also be formed by applying a nonmagnetic film such as a fluorine coat. In addition, what is necessary is just to provide a nonmagnetic layer in the upper surface of FIG. 7 of the ring member 50 when setting the frictional force between the plunger 20 and the movable core 22 small.

  In the embodiment (the embodiment of FIG. 7) in which the outer surface that contacts the guide hole 16 of the outer peripheral portion (contact portion) 51 is configured as a thin nonmagnetic layer (the embodiment of FIG. 7), the material of the nonmagnetic layer or the processing method of the nonmagnetic layer ( The frictional force obtained between the outer peripheral portion (contact portion) 51 of the ring member 50 and the guide hole 16 can be controlled by appropriately selecting a processing method for making the outer surface nonmagnetic.

  In each of the above-described embodiments, the embodiment has been described in which the plunger 20 is not provided with a through-hole capable of flowing the working liquid in the axial direction. However, the electromagnetic wave according to the third embodiment shown in FIGS. When the plunger 20 is provided with a through hole 22a capable of flowing the working liquid in the axial direction as in the valve V3, the working liquid is axially formed in the inner peripheral portion of the ring member 50. What is necessary is just to provide by providing the passage 52 which enables distribution and providing the positioning ring 60 for fixing the rotation phase of the through hole 22a and the passage 52. The positioning ring 60 has a fixing protrusion (fixing portion) 61 that engages with a locking hole 53 provided in the inner peripheral portion of the ring member 50, and is fitted to the shaft portion 21 b of the valve body 21. The plunger 20 is sandwiched between the valve body 21 and the movable core 22 so as not to rotate.

  In the electromagnetic valve V3 of the third embodiment described above, the fixing ring 61 is provided on the positioning ring 60 in order to fix the rotational phase of the through hole 22a and the passage 52, but the first embodiment shown in FIGS. As in the modified embodiment of the third embodiment, it is also possible to carry out by providing the fixing claw 21c1 on the flange portion 21c of the valve body 21 itself. In this modified embodiment, the positioning ring 60 required in the case of the third embodiment is unnecessary and can be configured simply.

  In the electromagnetic valve V3 of the third embodiment described above and its modified embodiment (embodiment provided with a fixing portion (fixing protrusion 61 or fixing claw 21c1) capable of fixing the rotational phase of the through hole 22a and the passage 52), The ring member 50 can be assembled to the plunger 20 in a state where the rotation phases of the through hole 22a and the passage 52 are matched. In this case, the rotation of the ring member 50 relative to the plunger 20 can be suppressed by the fixing portion (the fixing protrusion 61 or the fixing claw 21c1), and the rotational phase shift between the through hole 22a and the passage 52 can be suppressed. Is possible.

  In each of the above-described embodiments, the valve body 21 of the plunger 20 and the movable core 22 (the plunger main body) are configured as separate members. However, when the present invention is implemented, the valve body 21 of the plunger 20 and the movable core 22 are configured. (The main body portion of the plunger) can be implemented by a single member. Further, in each of the above-described embodiments, a contact portion (the outer peripheral portion 51 of the ring member 50) provided on the plunger 20 and capable of contacting the guide hole 16 is assembled to one end portion of the plunger 20 so as to be movable in the radial direction. Although the ring member 50 is provided, the contact portion provided in the plunger and capable of contacting the guide hole can be provided integrally with the plunger when the present invention is implemented. In this case, it is desirable that the contact portion has elasticity.

DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... Inlet, 12 ... Outlet, 13 ... Passage, 14 ... Valve seat, 15 ... Valve hole, 16 ... Guide hole, 20 ... Plunger, 21 ... Valve body, 21a ... Valve part, 22 ... Movable Core, 30 ... Spring, 40 ... Solenoid (electromagnetic coil), 50 ... Ring member, 51 ... Outer peripheral part (contact part), P11 ... First contact part, P12 ... Second contact part, P13 ... Third contact Part, V1, V2, V3 ... Solenoid valve

Claims (8)

An inflow port and an outflow port for the working liquid; a passage that communicates with the inflow port; a valve hole that is provided in the passage and has a valve seat formed at one end thereof; and A housing having a coaxial guide hole;
A plunger that is housed in the housing and has a valve body that can be seated and separated with respect to the valve seat at one end, and is movable in the axial direction in contact with the guide hole at the outer periphery of the other end;
A spring housed in the housing and biasing the plunger in the axial direction toward the valve seat;
An electromagnetic valve provided with a solenoid that is attached to the housing and generates a suction force against the load of the spring against the plunger by energization;
When the valve body is seated on the valve seat, the contact hole between the valve body and the valve seat, the outer periphery of the other end of the plunger and the contact hole of the guide hole, An electromagnetic valve in which a contactable contact portion is provided on the plunger. The electromagnetic valve according to claim 1,
The said contact part is a solenoid valve provided in the outer peripheral part of the ring member assembled | attached to the one end part of the said plunger so that a movement in radial direction was possible. The electromagnetic valve according to claim 2,
The said valve body is comprised by the member different from the said plunger, The said ring member is an electromagnetic valve currently clamped by the said valve body and the said plunger in the axial direction. The electromagnetic valve according to claim 2,
The ring member is an electromagnetic valve formed by including a magnetic material. The electromagnetic valve according to claim 4,
An electromagnetic valve in which an outer surface of the ring member in contact with the guide hole is made of a nonmagnetic material. The electromagnetic valve according to claim 3,
A passage that allows the working liquid to flow in the axial direction is provided in the inner peripheral portion of the ring member, and the plunger has a through hole that can communicate with the passage and allow the working liquid to flow in the axial direction. Provided,
The electromagnetic valve provided with the fixing | fixed part which can fix the rotation phase of the said channel | path and the said through-hole. The electromagnetic valve according to claim 6,
The fixed portion is an electromagnetic valve provided in a separate member from the valve body and the plunger. The electromagnetic valve according to claim 6,
The fixed portion is an electromagnetic valve provided integrally with the valve body or the plunger.

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