JP2012132532A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which is prevented from repetitive occurrence therein of valve switching failure and collision noise produced when a plunger and a fixed iron core are attracted together.SOLUTION: A movement distance S1 of a spool 6 by inertia produced when the plunger 11 is attracted to an attraction face 101 is decided by a distance between an end surface 163 on the attraction direction side of a stopper part 162 of a second spring receiver 16 and a bottom surface 185 of a cap 18. The movement distance S1 is formed to a distance where attraction force by which the plunger 11 is attracted does not match with inertia force for pushing back the plunger 11 by the spool 6, and a distance shorter than a shortest distance T between a force balance part H and the bottom surface 185 of the cap 18. When the plunger 11 is attracted, the end surface 163 of the stopper part 162 and the bottom surface 185 of the cap 18 are brought into contact to restrict movement of the second spring receiver 16 in the attraction direction side.

Description

  The present invention relates to a solenoid valve that prevents vibration and spool switching failure that occur when a plunger is attracted to a fixed iron core.

  As a solenoid valve for preventing excessive overrun of the spool, there is one described in Patent Document 1.

  In Patent Document 1, the solenoid includes a valve device and a solenoid connected to the valve device. The valve device includes a valve body and an oil passage disposed in the valve body. The oil passage has a plurality of ports communicating with each other, and a spool is disposed so as to freely advance and retract. The solenoid was provided with a fixed iron core having a suction surface and a plunger capable of approaching and separating from the suction surface. A valve pin is interposed between the spool and the plunger to transmit the movement of the plunger to the spool.

  A spool return spring that presses the spool is disposed on the surface of the valve body that faces the spool, and a stopper that receives the spool is disposed at a position where the spool is pushed when the plunger is attracted. It was set up. A spring seat is disposed on an end surface of the spool facing the spool return spring, and the spool return spring presses the spool via the spring seat.

  The distance from the attracting surface of the fixed iron core to the receiving end for receiving the spool of the stopper, and the distance from the contact end surface of the plunger to the fixed iron core to the spring seat disposed on the end surface on the side where the spool stopper is disposed It was formed substantially equally.

Japanese Utility Model Publication No. 61-18291

  The problem relating to excessive overrunning of the spool has been solved by the solenoid valve of Patent Document 1.

  By the way, when a collision sound is repeatedly generated when the plunger is attracted to the fixed iron core when the solenoid valve is operated, a current waveform as shown in FIG. In FIG. 3, the solid line represents the power supply voltage, and the broken line represents the solenoid coil current value.

  In this case, when compared with the waveform when the solenoid valve is operating normally as shown in FIG. 3A, the plunger repeatedly adsorbs and detaches, and thus an abnormal current value is observed. This is because, as a characteristic of the AC type solenoid, the current value increases as the plunger moves away from the adsorption surface of the fixed iron core.

  From these things, it is possible to prevent the switching failure of the valve and the repeated occurrence of the collision sound when the plunger and the fixed iron core are attracted, and maintain the normal current waveform state as shown in FIG. Is desired.

  In view of the above circumstances, the present invention provides a solenoid valve that prevents valve switching failure and repeated occurrence of collision noise when a plunger and a fixed iron core are adsorbed.

  According to the first aspect of the present invention, the movement distance due to the inertia of the spool when the plunger is attracted is formed such that the attracting force by which the plunger is attracted and the inertia force by which the spool pushes back the plunger are not balanced. ing.

  As a result, either the inertia force of the spool to be pushed back or the suction force of the solenoid will win, so the phenomenon that the plunger is attracted to the fixed iron core and the spool pushes the plunger back in a loop shape. It can be prevented from being repeated. Therefore, it is possible to prevent the valve switching failure and the repeated occurrence of the collision sound when the plunger and the fixed iron core are adsorbed.

  In the invention of claim 2, when the plunger is adsorbed, the end surface on the contact member side of the spring receiver and the end surface on the spring receiver side of the contact member are formed so as to contact with each other due to the inertia of the spool, The movement distance due to the inertia of the spool is determined by the distance between the end surface on the contact member side of the spring receiver and the end surface on the spring receiver side of the contact member when the plunger is adsorbed on the adsorption surface. With such a configuration, it is possible to prevent a valve switching failure and repeated occurrence of a collision sound when the plunger and the fixed iron core are adsorbed.

  If the movement distance due to the inertia of the spool is set to a distance shorter than the distance where the adsorption force by which the plunger is adsorbed and the inertia force by which the spool pushes back the plunger is balanced as in the third aspect of the invention, The end surface on the contact member side and the end surface on the spring receiving side of the contact member come into contact with each other, and the movement of the spool is restricted. Therefore, since the attracting force of the plunger exceeds the inertial force by which the spool pushes back the plunger, the attracting of the plunger is maintained. Therefore, the attracting of the plunger to the fixed iron core and the pushing of the spool return spring to the spool are preferably repeated. Can be prevented.

  Further, as in the invention of claim 4, even if the moving distance due to the inertia of the spool is formed to be longer than the distance where the attracting force by which the plunger is attracted and the inertial force by which the spool pushes back the plunger is balanced, It is possible to prevent the phenomenon that the adsorption of the plunger to the fixed iron core and the spool pushes back the plunger are repeated in a loop shape.

  As in the fifth aspect of the invention, in the case of the double solenoid type, the spring receiver is formed in an annular plate shape, and the abutting member has a projecting portion extending toward the spring receiver side. Thus, the number of parts and the manufacturing process can be reduced.

Further, as in the sixth aspect of the invention, in the case of a single solenoid type,
When the plunger is adsorbed, the end surface on the abutting member side of the spool and the end surface on the spring receiving side of the abutting member are formed so as to abut against each other due to the inertia of the spool. Is determined by the distance between the end surface of the spool on the abutting member side and the end surface of the abutting member on the spring receiving side. Even with such a configuration, it is possible to prevent a valve switching failure and repeated occurrence of a collision sound when the plunger and the fixed iron core are adsorbed.

  According to the seventh aspect of the present invention, the movement distance due to the inertia of the spool is formed to be shorter than the distance in which the adsorption force by which the plunger is adsorbed and the inertia force by which the spool pushes back the plunger is balanced. The same effect as that of the invention described in item 3 can be obtained.

  According to the eighth aspect of the present invention, the movement distance due to the inertia of the spool is formed to be longer than the distance between the adsorption force at which the plunger is adsorbed and the inertial force at which the spool pushes back the plunger. In this way, the same effect as that of the fourth aspect of the invention can be obtained.

  In the present invention, it is possible to prevent a valve switching failure and repeated occurrence of a collision sound when the plunger and the fixed iron core are adsorbed.

It is sectional drawing of 1st embodiment of the solenoid valve in this invention. In FIG. 1, (a) the end surface 163 of the stopper portion 162 on the suction direction side and the bottom surface 185 of the cap 18 are in contact with each other due to the inertia of the spool 6, and (b) the plunger 11 is attracted to the suction surface 101. It is the elements on larger scale which showed the state of having stopped. It is a current waveform diagram of a solenoid valve. It is sectional drawing of 2nd embodiment of the solenoid valve in this invention. In FIG. 4, (a) the end surface 153A of the stopper portion 152A on the suction direction side and the bottom surface 107A of the bottomed hole 106A of the fixed core 10A are in contact with each other due to the inertia of the spool 6, and (b) the plunger 11 is the suction surface. FIG. 10 is a partial enlarged cross-sectional view illustrating a state in which it is stationary when adsorbed to 101. It is a partial expanded sectional view of the 1st modification of 1st embodiment of the solenoid valve in this invention. It is a partial expanded sectional view of the 2nd modification of 1st embodiment of the solenoid valve in this invention. It is a partial expanded sectional view of the 1st modification of 2nd embodiment of the solenoid valve in this invention. It is a partial expanded sectional view of the 2nd modification of 2nd embodiment of the solenoid valve in this invention. It is a partial expanded sectional view of the example which formed distance longer than the longest distance of the force balance part H of the solenoid valve in this invention. FIG. 6 is a partially enlarged cross-sectional view of an example in which a solenoid valve moving distance S9 according to the present invention is determined by a distance between an end surface 62K on the bottom surface 185 side of the cap 18 of the spool 6K and a bottom surface 185 of the cap 18;

  A first embodiment of a solenoid valve according to the present invention will be described with reference to the drawings. In the following description, the direction of the left arrow toward FIG. 1 is the separation direction, and the direction of the right arrow is the suction direction.

  As shown in FIG. 1, the solenoid valve 1 is a single solenoid type using an AC power supply, and includes a valve device 2 and a solenoid 3 connected to the valve device 2.

  In the valve device 2, an oil passage 5 is disposed in the valve body 4, and a plurality of ports (not shown) communicate with the oil passage 5, and a spool 6 is disposed so as to freely advance and retract.

  The solenoid 3 has a case 8 in which a coil 7 is built. A solenoid iron core 9 is disposed on the inner peripheral side of the coil 7 so as to protrude in the direction of separation.

  The solenoid iron core 9 has a main body portion 91 projecting to the outside of the case 8 and a cylindrical portion 92 formed in a cylindrical shape located on the inner peripheral side of the coil 7. The solenoid iron core 9 is welded to the fixed iron core 10 on the suction direction side of the cylindrical portion 92, and a plunger 11 is disposed in the hollow portion of the cylindrical portion 92 so as to approach a suction surface 101 of the fixed iron core 10 to be described later by excitation of the coil 7. ing. The solenoid iron core 9 is screwed together by the fixture 12 on the side of the main body 91 in the direction of detachment and is fixed to the case 8.

  The fixed iron core 10 has an adsorption surface 101 on which the plunger 11 is adsorbed on the detachment direction side. An insertion hole 102 through which a later-described valve pin 14 is inserted is formed in the fixed iron core 10 along the adsorption / desorption direction. The fixed iron core 10 has a columnar column portion 103 and a flange portion 104 having a diameter larger than that of the column portion 103, and the flange portion 104 is in contact with the surface of the valve body 4 on the separation direction side. The spring receiving portion 105 is disposed on the suction direction side of the flange portion 104, and a bottomed hole 106 is formed along the suction and separation direction. The spring receiving portion 105 abuts the spring 13 on the bottom surface 107 of the bottomed hole 106, and on the outer peripheral surface. The valve body 4 is screwed together.

  Between the spool 6 and the plunger 11, a valve pin 14 that transmits the movement of the plunger 11 to the spool 6 is slidably disposed in the insertion hole 102.

  The valve pin 14 and the spool 6 are formed so as to abut on each other in the first spring receiver 15.

  The first spring receiver 15 includes a flange portion 151 that is formed in an annular plate shape on the suction direction side, and a cylindrical stopper portion 152 that extends from the flange portion 151 toward the separation direction. Yes.

  The spring 13 is formed in a spiral shape and disposed on the outer peripheral portion of the stopper portion 152, and abuts against the flange portion 151 and the bottom surface 107 to urge the spool 6 in the suction direction.

  The spool 6 is formed in a columnar shape along the suction and separation direction, and a second spring receiver 16 (corresponding to a spring receiver in the claims) is attached to an end portion in the suction direction. The spool 6 has two large diameter portions 61. The large-diameter portion 61 is formed so as to connect and block a port (not shown) according to the position along the suction / removal direction of the spool 6.

  The second spring receiver 16 includes a flange portion 161 that is formed in an annular plate shape and is located on the separation direction side, and a cylindrical stopper portion 162 that extends from the flange portion 161 toward the suction direction side. ing.

  The spool return spring 17 is formed in a spiral shape and disposed on the outer peripheral portion of the stopper portion 162, and abuts against the flange portion 161 and a bottom surface 185 of the cap 18 described later to urge the spool 6 in the disengagement direction. Yes.

  The cap 18 (corresponding to an abutting member in claims) is provided on a columnar column 181 having a step, a flange 182 having a diameter larger than that of the column 181, and a separation direction side of the column 181. Spring receiving portion 183. The spring receiving portion 183 is formed with a bottomed hole 184 along the adsorption / removal direction, abuts against the spool return spring 17 at the bottom surface 185 of the bottomed hole 184 and is screwed with the valve body 4 at the outer peripheral surface.

  FIG. 2B shows a stationary state when the plunger 11 is attracted to the suction surface 101, and the movement distance S1 due to the inertia of the spool 6 when the plunger 11 is attracted to the suction surface 101 is the second. This is defined by the distance between the end surface 163 of the stopper portion 162 of the spring receiver 16 on the suction direction side and the bottom surface 185 of the cap 18. The moving distance S <b> 1 is a distance in which the attracting force to which the plunger 11 is attracted and the inertia force in which the spool 6 pushes back the plunger 11 are not balanced, and the shortest distance between the force balance portion H and the bottom surface 185 of the cap 18. It is formed at a distance shorter than T.

  Here, as shown in FIG. 2B, the “movement distance S1” is a distance between the end surface 163 of the stopper portion 162 of the second spring receiver 16 on the suction direction side and the bottom surface 185 of the cap 18. The distance in the shortest case. The following “distances S2 to S9”, “shortest distance T”, and “longest distance U” are considered similarly.

  Here, as shown in FIG. 2 (b), the “force balance portion” means an adsorption force that adsorbs the plunger 11 and a spool that fluctuate due to changes in the viscosity of the lubricating oil, the outside air temperature, the power supply voltage, and the like. 6 refers to a collective portion of positions where the inertial force that pushes back the plunger 11 and the balance.

  As shown in FIG. 2A, when the plunger 11 is attracted, the end surface 163 of the stopper portion 162 of the second spring receiver 16 and the bottom surface 185 of the cap 18 are caused by the inertia of the spool 6. It is formed to abut.

  The operation of the solenoid valve 1 will be described. When the coil 7 is energized, as shown in FIG. 2, the plunger 11 is attracted to the adsorption surface 101 of the fixed iron core 10, and the spool 6 moves in the adsorption direction via the valve pin 14.

  As shown in FIG. 2A, when the plunger 11 is sucked, the plunger 11 has an end surface 163 on the suction direction side of the stopper portion 162 of the second spring receiver 16 and a bottom surface 185 of the cap 18 so that the spool 11 6 is in contact with the inertia. Further, the moving distance S1 determined by the distance between the end surface 163 of the stopper portion 162 of the second spring receiver 16 on the suction direction side and the bottom surface 185 of the cap 18 is shorter than the shortest distance T of the force balance portion H. Since the distance is formed, the movement toward the suction direction when the end surface 163 of the stopper 162 and the bottom surface 185 of the cap 18 abut is limited. And since the adsorption force of the plunger 11 exceeds the inertial force which the spool 6 pushes back the plunger 11, adsorption | suction of the plunger 11 is maintained.

  Since the inertia force by which the spool 6 pushes back the plunger 11 is lower than the adsorption force by which the plunger 11 is adsorbed, the adsorption of the plunger 11 to the fixed iron core 10 and the pushing of the spool return spring 17 to the spool 6 are repeated in a loop shape. To prevent.

  When energization of the coil 7 is stopped, the flow of magnetic flux disappears, the urging force of the spool return spring 17 exceeds the attracting force to which the plunger 11 is attracted, the plunger 11 is returned to the disengagement direction side, and the fixed iron core 10 The spool 6 is returned to the neutral position by the biasing force of the side spring 13.

  In the solenoid valve 1, the end surface 163 of the stopper portion 162 of the second spring receiver 16 on the suction direction side and the bottom surface 185 of the cap 18 come into contact with each other due to the inertia of the spool 6 when the plunger 11 is sucked. is doing. In addition, the moving distance S1 determined by the distance between the end surface 163 of the stopper portion 162 of the second spring receiver 16 on the suction direction side and the bottom surface 185 of the cap 18 is set to the suction force by which the plunger 11 is sucked. The inertial force that the spool 6 pushes back the plunger 11 is a distance that does not balance, and is shorter than the shortest distance T between the force balance portion H and the bottom surface 185 of the cap 18.

  As a result, the inertial force by which the spool 6 pushes back the plunger 11 is less than the adsorption force by which the plunger 11 is adsorbed, and the end surface 163 of the stopper 162 and the bottom surface 185 of the cap 18 come into contact with each other toward the adsorption direction. Movement is restricted. Therefore, the phenomenon that the adsorption of the plunger 11 to the fixed iron core 10 and the phenomenon that the spool 6 pushes back the plunger 11 is repeated in a loop shape, the force balance portion H and the bottom surface of the cap 18 shown in FIG. This can be prevented more suitably than the one formed in a distance longer than the longest distance U with 185. Therefore, it is possible to prevent the valve switching failure and the repeated occurrence of the collision sound when the plunger 11 and the fixed iron core 10 are adsorbed.

  Further, the two parts of the second spring receiver 16 and the cap 18 are determined by the distance between the end surface 163 of the stopper portion 162 of the second spring receiver 16 on the suction direction side and the bottom surface 185 of the cap 18. Since the movement distance S1 is adjusted, the number of parts and the manufacturing process can be reduced.

  Furthermore, by adjusting the length of the stopper portion 162 of the second spring receiver 16 in the adsorption / detachment direction, the movement distance S1 can be easily set.

  A second embodiment of the solenoid valve in the present invention will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Although the present embodiment is a double solenoid type, the direction of the left arrow in FIG. 4 is the separation direction, and the direction of the right arrow is the suction direction. In addition, since it is a double solenoid type, when the plunger 11A is adsorbed, the first spring receiver 15 corresponds to the spring receiver of the claims, and the spring 13 is the spool return spring of the claims. The fixed iron core 10 corresponds to the contact member in the claims.

  As shown in the drawing, the solenoid valve 1A has a solenoid 3A instead of the cap 18 on the suction direction side of the valve device 2.

  The solenoid 3A has a case 8A in which a coil 7A is built. A solenoid iron core 9A is disposed on the inner peripheral side of the coil 7A so as to protrude in the attracting direction.

  The solenoid core 9A has a main body portion 91A that protrudes outside the case 8A and a cylindrical portion 92A that is formed in a cylindrical shape and is located on the inner peripheral side of the coil 7A. The solenoid iron core 9A is welded to the fixed iron core 10A on the detaching direction side of the cylindrical portion 92A, and a plunger 11A that approaches a suction surface 101A of the fixed iron core 10A described later by excitation of the coil 7A is disposed in the hollow portion of the cylindrical portion 92A. ing. The solenoid iron core 9A is screwed by a fixing tool 12A on the suction direction side of the main body 91A and fixed to the case 8A.

  The fixed iron core 10A has an adsorption surface 101A on which the plunger 11A is adsorbed on the detachment direction side. The fixed iron core 10A (corresponding to an abutting member in claims) is formed with an insertion hole 102A through which a valve pin 14A, which will be described later, is inserted, along the adsorption / desorption direction. The fixed iron core 10A has a columnar column portion 103A and a flange portion 104A having a diameter larger than that of the column portion 103A, and is in contact with the surface on the suction direction side of the valve body 4 at the flange portion 104A. The spring receiving portion 105A is disposed on the detaching direction side of the flange portion 104A, and a bottomed hole 106A is formed along the adsorption detaching direction. The bottom surface 107A of the bottomed hole 106A abuts the spring 13A, and on the outer peripheral surface. The valve body 4 is screwed together.

  Between the spool 6 and the plunger 11A, a valve pin 14A for transmitting the movement of the plunger 11A to the spool 6 is slidably disposed in the insertion hole 102A.

  The valve pin 14A and the spool 6 are formed so as to contact each other in the first spring receiver 15A (corresponding to the spring receiver in the claims).

  The first spring receiver 15A has a flange portion 151A that is formed in an annular plate shape on the side of the separation direction, and a cylindrical stopper portion 152A that extends from the flange portion 151A toward the suction direction. Yes.

  The spring 13A is formed in a spiral shape and is disposed on the outer peripheral portion of the stopper portion 152A. The spring 13A is in contact with the flange portion 151A and the bottom surface 107A to urge the spool 6 in the disengagement direction.

  FIG. 5B shows a stationary state when the plunger 11 is attracted to the attracting surface 101, and the movement distance S2 due to the inertia of the spool 6 when the plunger 11 is attracted to the attracting surface 101 is the first. It is determined by the distance between the end surface 153A of the stopper portion 152A of one spring receiver 15A and the bottom surface 107A of the bottomed hole 106A of the fixed iron core 10A. The moving distance S2 is a distance in which the attracting force that attracts the plunger 11 and the inertial force in which the spool 6 pushes back the plunger 11 are not balanced, and the force balance portion H and the bottomed hole 106A of the fixed iron core 10A. The distance is shorter than the shortest distance T with the bottom surface 107A.

  As shown in FIG. 5A, when the plunger 11 is attracted, the end surface 153A on the suction direction side of the stopper portion 152A of the first spring receiver 15A, and the bottom surface 107A of the bottomed hole 106A of the fixed iron core 10A, Are formed so as to abut on each other due to the inertia of the spool 6.

  The solenoid valve 1A is a double solenoid type, and the solenoid 3A and the solenoid 3A are arranged symmetrically, so the solenoid 3 side has the same configuration.

  The solenoid valve 1A differs from the cap 18 only in having a solenoid 3A. The solenoid 3A has the effect of reversing the adsorption / removal direction of the solenoid 3 of the first embodiment, and has the same effect as the solenoid valve 1 of the first embodiment.

  A modification of the first embodiment of the solenoid valve in the present invention will be described.

  In the first modification, as shown in FIG. 6, the second spring receiver 16C is formed in an annular plate shape. The cap 18C has a columnar protrusion 186C extending toward the separation direction side.

  Thereby, the movement distance S3 can be easily set by adjusting the length of the protruding portion 186C in the adsorption / detachment direction.

  In the second modification, as shown in FIG. 7, the length of the stopper portion 162 </ b> D of the second spring receiver 16 </ b> D is shorter than the second spring receiver 16 of the first embodiment. Yes. The protrusion 186D of the cap 18D is formed to have a shorter length in the adsorption / detachment direction than the protrusion 186C of the cap 18C of the first modification of the first embodiment. Accordingly, the movement distance S4 can be easily set by adjusting the lengths of the protrusions 186D and the stoppers 162D in the adsorption / removal direction.

  A modification of the second embodiment will be described.

  In the first modification, as shown in FIG. 8, the first spring receiver 15E is formed in an annular plate shape. The fixed iron core 10E has a cylindrical protrusion 108E extending from the bottom surface 107A of the bottomed hole 106A toward the detachment direction.

  Thereby, the movement distance S5 can be easily set by adjusting the length of the protruding portion 108E in the suction and separation direction.

  In the second modified example, as shown in FIG. 9, the length of the stopper portion 152F of the first spring receiver 15F in the suction and separation direction is longer than the stopper portion 152A of the first spring receiver 15A of the second embodiment. It is short. The protruding portion 108F of the fixed iron core 10F is formed to have a shorter length in the adsorption / detachment direction than the protruding portion 108E of the fixed iron core 10E of the first modified example of the second embodiment. Accordingly, the movement distance S6 can be easily set by adjusting the lengths of the protrusions 108F and the stoppers 152F in the suction / removal direction.

  Further, as shown in FIG. 10, the movement distance S7 due to the inertia of the spool 6 when the plunger 11 is attracted to the attracting surface 101 is set to the end surface 163G on the attracting direction side of the stopper portion 162G of the second spring receiver 16G. The distance between the bottom surface 185 of the cap 18 can be determined. The moving distance S7 is a distance that does not balance the attracting force by which the plunger 11 is attracted and the inertial force by which the spool 6 pushes back the plunger 11, and includes the force balance portion H and the bottom surface 185 of the cap 18. The distance is longer than the longest distance U. Also by this, the inertial force at which the spool 6 pushes back the plunger 11 exceeds the adsorption force at which the plunger 11 is attracted, and the plunger 11 is attracted to the fixed iron core 10 and the spool return spring 17 is pushed back to the spool 6. It is possible to prevent the phenomenon from being repeated in a loop.

  In the single solenoid type, as shown in FIG. 11, the movement distance S8 due to the inertia of the spool 6K is set to the end face 62K on the bottom face 185 side of the cap 18 of the spool 6K when the plunger 11 is sucked to the suction face 101. And the distance between the bottom surface 185 of the cap 18. The moving distance S8 is a distance that does not balance the attracting force by which the plunger 11 is attracted and the inertial force by which the spool 6K pushes back the plunger 11, and includes the force balance portion H and the bottom surface 185 of the cap 18. The distance is shorter than the shortest distance T. This also has the same effect as the solenoid valve 1 of the first embodiment.

  Further, as shown by the broken line in FIG. 11, the movement distance S9 due to the inertia of the spool 6K is set to the end surface 62K on the bottom surface 185 side of the cap 18 of the spool 6K when the plunger 11 is adsorbed to the adsorption surface 101, and the cap 18 The distance between the bottom surface 185 and the bottom surface 185 of the substrate. The moving distance S9 is a distance that does not balance the attracting force by which the plunger 11 is attracted and the inertial force by which the spool 6K pushes back the plunger 11, and includes the force balance portion H and the bottom surface 185 of the cap 18. It can also be formed at a distance longer than the longest distance U.

  The present applicant conducted an experiment using the solenoid valve of the first embodiment under an applied voltage of 90 V and setting the movement distance S1 to 0.5 mm, 1.0 mm, and 1.5 mm. When the moving distance S1 was 1.0 mm, the adsorption of the plunger 11 to the fixed iron core 10 and the pushing of the spool return spring 17 into the spool 6 were repeated in a loop to generate vibration. When the other moving distance S1 was 0.5 mm and 1.5 m, vibration did not occur. From this, the result is obtained that the effect can be obtained if the moving distance S1 is set to a distance that does not balance the attracting force by which the plunger 11 is attracted and the inertial force by which the spool 6 pushes back the plunger 11.

1, 1A Solenoid valve 2 Valve device 3, 3A Solenoid 4 Valve body 5 Oil passage 6, 6K Spool 62K End face 7 Coil 8 Case 9, 9A Solenoid iron core 10, 10A, 10E, 10F Fixed iron core 101, 101A Adsorption surface 11 Plunger 13 Spring 14, 14A Valve pin 16, 16C, 16D, 16G Second spring receiver 162, 162D, 162G Stopper portion 163C, 163D End surface 17 Spool return spring 18, 18C, 18D Cap 185 Bottom surface 186C, 186D Protrusion portion 187C, 187D Bottom surface S1 , S2, S3, S4, S5, S6, S7, S8, S9 Movement distance H Force balance part T Shortest distance U Longest distance

Claims (8)

A valve device and a solenoid coupled to the valve device,
In the valve device, an oil passage is disposed in the valve body, and a plurality of ports communicate with the oil passage, and a spool is disposed so as to freely advance and retract.
The solenoid is provided with a coil, a fixed iron core having an adsorption surface, and a plunger that approaches the adsorption surface by excitation of the coil,
Between the spool and the plunger, a valve pin that transmits the movement of the plunger to the spool is disposed,
A solenoid valve that opens and closes the port by moving the spool when the plunger is attracted to the attracting surface;
A spool return spring that pushes back the spool is disposed on a side of the valve body on which the spool moves when the plunger is attracted to the suction surface, and a contact member that supports the spool return spring. Is arranged,
On the side of the spool where the spool return spring is disposed, a spring receiver that contacts the spool return spring is disposed,
The movement distance due to the inertia of the spool when the plunger is attracted is formed such that the attracting force by which the plunger is attracted and the inertial force by which the spool pushes back the plunger are not balanced. Solenoid valve characterized by When the plunger is attracted, the end surface on the contact member side of the spring receiver and the end surface on the spring receiver side of the contact member are formed to contact with each other due to inertia of the spool,
The movement distance due to the inertia of the spool is between the end surface on the contact member side of the spring receiver and the end surface on the spring receiver side of the contact member when the plunger is attracted to the suction surface. The solenoid valve according to claim 1, wherein the solenoid valve is determined by a distance.   3. The moving distance due to the inertia of the spool is formed to be shorter than a distance in which an adsorption force by which the plunger is adsorbed and an inertia force by which the spool pushes back the plunger is balanced. Solenoid valve.   3. The moving distance due to the inertia of the spool is formed to be longer than a distance in which an attracting force by which the plunger is attracted and an inertia force by which the spool pushes back the plunger is balanced. Solenoid valve. The solenoid valve is a double solenoid type,
The spring receiver is formed in an annular plate shape;
The solenoid valve according to claim 1, wherein the abutting member has a protrusion extending toward the spring receiving side. The solenoid valve is a single solenoid type,
When the plunger is adsorbed, the end surface on the contact member side of the spool and the end surface on the spring receiving side of the contact member are formed to contact with each other due to the inertia of the spool,
The movement distance due to the inertia of the spool is the distance between the end surface on the contact member side of the spool and the end surface on the spring receiving side of the contact member when the plunger is adsorbed on the adsorption surface. The solenoid valve according to claim 1, wherein the solenoid valve is defined by:   The movement distance due to the inertia of the spool is formed so as to be shorter than a distance in which an adsorption force by which the plunger is adsorbed and an inertia force by which the spool pushes back the plunger is balanced. Solenoid valve.   The movement distance due to the inertia of the spool is formed to be longer than a distance where an adsorption force by which the plunger is adsorbed and an inertia force by which the spool pushes back the plunger is balanced. Solenoid valve.

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