JP2014119048A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve capable of preventing degradation of an output characteristic even in controlling high-pressure high-flow rate.SOLUTION: A part between an output port 54 and a discharge port 55 is sealed by making a seal face inside of a sleeve 41 positioned between the output port 54 and the discharge port 55, be opposed to a peripheral face of an upstream-side configuration part 142, in forming a valve closing state in which the part between the output port 54 and the discharge port 55 is closed. A thickness dimension T of the upstream-side configuration part 142 is determined so that an oil passage groove 141 and a discharge-side small-diameter recessed portion 82 are communicated, and a space at an upstream side with respect to the upstream-side configuration part 142 and the discharge port 55 are communicated through the discharge-side small-diameter recessed portion 82 and the oil passage groove 141, in forming a valve opening state in which the output port 54 and the discharge port 55 are communicated by moving the upstream-side configuration portion 142 to the discharge-side small-diameter recessed portion 82.

Description

  The present invention relates to a solenoid valve having a spool.

  Conventionally, a spool type solenoid valve provided with a spool is known (for example, Patent Document 1).

  As a structure of such a spool type electromagnetic valve, the structure shown in FIG. 3 is known. The electromagnetic valve 801 includes an electromagnetic valve main body 802 and a nozzle portion 803 extending from the electromagnetic valve main body 802. It is configured. A spool 804 extending from the solenoid valve body 802 is accommodated in the nozzle portion 803, and the spool 804 is provided to be movable in the length direction.

  The nozzle portion 803 is provided with an input port 811, an output port 812, and a discharge port 813, and concave portions 815 to 817 communicating with the ports 811 to 813 are formed on the inner surface of the nozzle portion 803 on the entire circumference. It is recessed over.

  The spool 804 includes a small-diameter shaft portion 821 and a large-diameter valve portion provided on the shaft portion 821, and the valve portions are arranged in order from the solenoid valve body 802 side. The first valve portion 822, the second valve portion 823, and the third valve portion 824 are configured.

  The second valve portion 823 is configured to control the communication state between the input port 811 and the output port 812, and the third valve portion 824 includes the output port 812 and the discharge port 813. The communication state is controlled, and the pressure applied to the output port 812 can be discharged from the discharge port 813.

  In such a solenoid valve 801, the pressure of the flowing oil is applied to the spool 804 and acts as a lateral pressing force. Therefore, as a preventive measure, a method of forming labyrinth grooves 831 and 831 in the first valve portion 822 and the second valve portion 823 along the peripheral surface is known.

JP 2011-236964 A

  However, in such a conventional solenoid valve 801, as the oil to be controlled becomes high pressure and high flow rate, fluid turbulence occurs in the hydraulic circuit and the fluid force increases.

  More specifically, as shown in FIG. 4, in the oil flow path 841 passing through the recess 817 near the discharge port 813, the discharge port 813 passes through the recess 817 from the upstream space of the third valve portion 824. On the other hand, in the oil flow path 842 passing through the recess 817 at a position away from the discharge port 813, the oil flows along the outer periphery of the third valve portion 824 to the discharge port 813, and then the discharge It is discharged from the port 813.

  As a result, a pressure difference is generated between the internal pressure of the recess 817 near the discharge port 813 and the internal pressure of the recess 817 positioned away from the discharge port 813, and fluid turbulence occurs.

  Thereby, the force which presses the spool 804 in the lateral direction is increased, and the sliding friction is increased.

  In this case, as output characteristics, there is a possibility that hysteresis increases or a staircase waveform due to stick-slip occurs.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an electromagnetic valve capable of preventing a decrease in output characteristics even when a high pressure and a high flow rate are controlled. To do.

  In order to solve the above-mentioned problems, in the solenoid valve according to claim 1 of the present invention, a spool having a large-diameter valve portion provided in the shaft portion is moved within the sleeve, and a predetermined port provided in the sleeve is provided. While controlling the communication state with the discharge port, the solenoid valve is formed with a recess communicating with the discharge port on the inner surface of the sleeve over the entire circumference. When forming a valve-closed state in which the upstream-side constituent part upstream of the oil passage groove and the downstream-side downstream constituent part are formed, and the gap between the predetermined port and the discharge port is closed. In addition, the seal surface between the predetermined port and the discharge port is opposed to the seal surface on the inner side of the sleeve and the peripheral surface of the upstream component, and the upstream component is sealed. The portion is moved to the concave portion side to And the discharge port communicate with each other, the oil passage groove communicates with the recess, and the space upstream of the upstream component and the discharge port connect the recess and the oil. The dimensions of the upstream side configuration portion were set so as to communicate with each other via a road groove.

  That is, when the upstream side constituent part constituting the valve part of the spool is moved to the concave part provided on the inner surface of the sleep and the predetermined port and the discharge port are communicated to form the valve opening state, the valve part An oil passage groove formed over the entire circumference of the groove communicates with the recess.

  At this time, the oil passage groove is formed over the entire circumference of the valve portion, and the fluid flowing into the upstream space of the upstream component portion is provided in the outer peripheral portion of the upstream component portion. The oil flows into the oil passage groove through the recess, and is discharged from the discharge port through the oil passage groove.

  For this reason, compared with the case where the fluid from the upstream side space of the upstream side configuration portion is discharged from the discharge port through the outer peripheral portion of the valve portion, the flow becomes uniform over the entire circumference, and the rectifying effect is improved. can get.

  Further, in the electromagnetic valve according to claim 2, an opening area formed by the oil passage groove is equal to or larger than a valve opening area formed between the upstream side component and the end of the recess in the valve open state. Set to.

  That is, the opening area formed by the oil passage groove is set to be equal to or larger than the valve opening area formed between the upstream side component and the end of the recess in the valve opening state. The flow rate at the opening formed by the passage groove is set to be larger than the flow rate between the upstream side component and the end of the recess.

  Furthermore, in the electromagnetic valve according to claim 3, the oil passage groove is always in communication with the discharge port from the closed state to the open state.

  Thereby, pressure accumulation in the oil passage groove when the valve is closed is prevented.

  As described above, in the solenoid valve according to the first aspect of the present invention, the oil passage groove formed in the valve portion is formed over the entire circumference of the valve portion, and is upstream of the upstream component portion. The fluid input to the side space can flow into the oil passage groove via the recess provided in the outer peripheral portion of the upstream side configuration portion, and can be discharged from the discharge port through the oil passage groove.

  For this reason, compared with the case where the fluid from the upstream space of a valve part is discharged | emitted from a discharge port through the outer peripheral part of a valve part, the flow of the fluid can be made uniform over a perimeter. Thereby, a rectification effect can be acquired and fluid force can be controlled.

  Therefore, even when the high pressure and high flow rate are controlled, it is possible to prevent the output characteristics from being deteriorated.

  Further, since the above-described effect can be obtained only by changing the spool, the design of the sleeve is not changed and the layout can be given a degree of freedom.

  In the electromagnetic valve according to claim 2, the opening area formed by the oil passage groove is set to be equal to or larger than the valve opening area formed between the upstream side component and the end of the recess in the valve open state. Yes.

  For this reason, at the time of opening the valve, the discharge amount at the opening formed by the oil passage groove is larger than the flow rate from the discharge portion between the upstream side configuration portion and the end of the recess, and the opening portion It is possible to prevent a problem that the flow is restricted by the discharge unit.

  Further, the solenoid valve according to claim 3 is configured such that the oil passage groove always communicates with the discharge port from the closed state to the open state.

  For this reason, pressure accumulation in the oil passage groove when the valve is closed can be prevented, and the fluid can be smoothly discharged when the valve is opened.

It is sectional drawing which shows one embodiment of this invention. It is an enlarged view which shows the principal part of the embodiment. It is sectional drawing which shows the conventional solenoid valve. It is an enlarged view which shows the principal part of the prior art example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing an electromagnetic valve 1 according to the present embodiment, and the electromagnetic valve 1 is used in an automatic transmission of an automobile.

  The solenoid valve 1 includes a solenoid valve body 11, and a solenoid 15 having a coil 14 wound around a bobbin 13 is accommodated in a casing 12 of the solenoid valve body 11. A core 16 excited by the solenoid 15 is accommodated in the solenoid 15, and a yoke 18 is connected to an end of the core 16 via a connecting pipe 17.

  A plunger 21 is accommodated between the core 16 and the yoke 18, and a rod 22 is fixed to the plunger 21 in a penetrating manner. A portion of the rod 22 extending from the plunger 21 is supported by the core 16 and the yoke 18 via bearings 23 and 23, and the plunger 21 is supported so as to be movable in the axial direction.

  Thus, when the solenoid 15 is energized to excite the core 16, the plunger 21 is attracted by the core 16, and the rod 22 extending from the plunger 21 can move to the distal end side 31. It is configured.

  The solenoid valve main body 11 is provided with a sleeve 41 extending to the distal end side 31, and the sleeve 41 has a flange portion 42 provided at a proximal end thereof and a caulking portion provided at an end portion of the casing 12. The portion 43 is fixed to the electromagnetic valve main body 11.

  The sleeve 41 is formed in a cylindrical shape, and a feedback port 52, an input port 53, an output port 54 as a predetermined port, and a discharge port 55 are provided on the side surface in order from the base end side 51. ing.

  The feedback port 52 is opened in two directions in the vertical direction in FIG. 1, and the input port 53 and the output port 54 are opened downward in FIG. Further, the discharge port 55 is constituted by a single opening and opens upward in FIG.

  An input side recess 61 communicating with the input port 53 is provided on the inner side surface of the sleeve 41 over the entire circumference. The input side recess 61 is provided on the distal end side 31 of the input side recess 61. A smaller-diameter input-side small-diameter recess 62 is recessed over the entire circumference. The input-side recess 61 and the input-side small-diameter recess 62 communicate with each other, and the flow rate of the oil from the input port 53 is limited by the input-side small-diameter recess 62 and then the input-side recess 61 passes through the input-side recess 61. The sleeve 41 is configured to flow into the sleeve 41.

  Further, an output side recess 71 communicating with the output port 54 is provided on the inner side surface of the sleeve 41 over the entire circumference, and the oil in the sleeve 41 passes through the output side recess 71. The output port 54 is configured to flow out.

  Further, a discharge-side recess 81 communicating with the discharge port 55 is provided on the inner side surface of the sleeve 41 over the entire circumference. A discharge-side small-diameter recess 82 having a smaller diameter than the side recess 81 is provided over the entire circumference. The discharge-side recess 81 and the discharge-side small-diameter recess 82 communicate with each other. After the flow rate of the oil as the fluid in the sleeve 41 is limited by the discharge-side small-diameter recess 82, the discharge-side recess 81 It is configured to be discharged from the discharge port 55 opened to the atmosphere via

  A spool 101 is accommodated in the sleeve 41, and the spool 101 is held movably in the axial direction. The spool 101 includes a columnar shaft portion 102 and a valve portion having a larger diameter than the shaft portion 102. This valve portion is composed of a first valve portion 103, a second valve portion 104, and a third valve portion 105, which are arranged separately from the base end side 51 of the shaft portion 102 in order, The valve portions 103 to 105 are configured to be in sliding contact with the inner surface of the sleeve 41.

  The first valve portion 103 is configured to be in sliding contact with the inner peripheral surface of the sleeve 41 on the proximal side 51 from the feedback port 52, and the labyrinth groove 111 is entirely formed in the first valve portion 103. It is formed over the circumference. Thereby, even if the pressure of the flowing oil is applied to the spool 101 and acts as a lateral pressing force, the force can be suppressed.

  The second valve unit 104 is configured to control the opening degree of the feedback port 52 and to open and close the input port 53 so that the communication state between the input port 53 and the output port 54 can be controlled. It is configured. The labyrinth groove 121 is also formed in the second valve portion 104 over the entire circumference, and is configured so that the lateral pressing force applied to the spool 101 can be suppressed as described above.

  The third valve portion 105 is configured to control the opening degree of the discharge port 55, and is configured to be able to control the communication state between the output port 54 and the discharge port 55. A coil spring 132 is elastically supported between the distal end surface of the third valve portion 105 and the plug member 131 that closes the distal end of the sleeve 41. The spool 101 has a proximal end surface of the shaft portion 102. The rod 21 is urged so as to come into contact with the tip of the rod 22 extending from the plunger 21. Accordingly, the spool 101 urged toward the proximal end 51 by the coil spring 132 is configured to be driven to the distal end 31 when the plunger 21 is operated.

  As shown in FIG. 2, an oil passage groove 141 is formed on the entire downstream side of the third valve portion 105, and the oil passage groove 141 has a depth that reaches the shaft portion 102. It is recessed. Accordingly, the third valve portion 105 is formed by the upstream side configuration portion 142 that constitutes the upstream side from the oil passage groove 141 and the downstream side configuration portion 143 that constitutes the downstream side from the oil passage groove 141. Yes.

  As shown in FIG. 1, the third valve portion 105 is configured such that a part of the peripheral surface on the base end side of the upstream side configuration portion 142 is part of the sleeve 41 in a state where the spool 101 is retracted to the base end side 51. An inner inner surface, specifically, a seal surface 151 set on the inner side of the sleeve 41 located between the output-side recess 71 of the output port 54 and the discharge-side small-diameter recess 82 of the discharge port 55; It is configured to be in sliding contact, and is configured to be able to seal between the output port 54 and the discharge port 55. Thereby, it is comprised so that the valve closing state 152 which closed between the said output port 54 and the said discharge port 55 can be formed.

  On the other hand, when the spool 101 is moved to the distal end side 31 and the upstream side constituent portion 142 of the third valve portion 105 is moved to the discharge side small diameter concave portion 82 and the discharge side concave portion 81 side, FIG. As shown also, the space upstream of the upstream component 142 communicates with the discharge port 55 via the discharge side small diameter recess 82, the discharge side recess 81, and the oil passage groove 141. It is comprised so that the valve opening state 161 which connected the said output port 54 and the said discharge | emission port 55 can be formed.

  That is, as shown in FIG. 1, the thickness T of the upstream component 142 is such that, in the valve closing state 152, a part of the upstream component 142 wraps with the seal surface 151 and the opening In the valve state 161, at least the oil passage groove 141, the discharge-side small-diameter recess 82, and the discharge-side recess 81 are set to communicate with each other.

  As a result, the spool 101 is moved in the sleeve 41 to control the communication state between the output port 54 and the discharge port 55 provided in the sleeve 41, thereby applying the hydraulic pressure applied to the output port 54. The discharge amount from the discharge port 55 can be controlled.

  Further, in the present embodiment, as shown in FIG. 2, even in the valve open state 161, the upstream side component 142 so that the oil passage groove 141 and the discharge side recess 81 communicate with each other. As shown in FIG. 1, the oil passage groove 141 is always in communication with the discharge port 55 from the valve closing state 152 to the valve opening state 161. ing.

  Further, in the present embodiment, in the valve open state 161, the opening area 171 formed by wrapping the discharge port 55 and the oil passage groove 141 is the upstream component 142 in the valve open state 161. And the valve opening area 172 formed between the end portions of the discharge side small-diameter recess 82 is set.

  In the present embodiment according to the above configuration, the upstream-side component 142 constituting the third valve portion 105 of the spool 101 is provided on the discharge-side small-diameter recess 82 and the discharge-side recess 81 side provided on the inner surface of the sleep 41. When the output port 54 and the discharge port 55 are communicated with each other to form the valve open state 161, as shown in FIG. 2, it is formed over the entire circumference of the third valve portion 105. The oil passage groove 141 and the discharge side recess 81 communicate with each other.

  At this time, the oil passage groove 141 is formed over the entire circumference of the third valve portion 105, and the oil that has flowed into the upstream space of the upstream configuration portion 142 flows into the upstream configuration portion 142. The oil flows into the oil passage groove 141 (shown by 181 in FIG. 2) via the discharge side small-diameter recess 82 and the discharge side recess 81 provided on the outer periphery, and the discharge through the oil passage groove 141. It is discharged from the port 55.

  For this reason, compared with the case where the oil from the upstream side space of the upstream side component 142 passes through the outer peripheral part of the valve part and is discharged from the discharge port, the flow becomes uniform over the entire periphery, and the rectifying effect Therefore, the fluid force can be suppressed.

  Therefore, even when the high pressure and high flow rate are controlled, it is possible to prevent the output characteristics from being deteriorated.

  Further, since the effect can be obtained only by changing the spool 101, the design of the sleeve 41 is not changed, and the layout can be given a degree of freedom.

  The opening area 171 formed by the oil passage groove 141 is set to be equal to or larger than the valve opening area 172 formed between the upstream side component 142 and the end of the discharge side small-diameter recess 82 in the valve open state 161. In the valve open state 161, the flow rate at the opening formed by the oil passage groove 141 is larger than the flow rate between the upstream side component 142 and the end of the discharge side small diameter recess 82. Is set as follows.

  For this reason, in the valve open state 161, the discharge amount at the opening formed by the oil passage groove 141 is the flow rate from the discharge portion between the upstream side configuration portion 142 and the end of the discharge side small-diameter recess 82. It is possible to prevent a problem that the flow becomes larger and the flow of the opening is restricted by the discharge portion.

  Further, the oil passage groove 141 is always in communication with the discharge port 55 from the valve closing state 152 to the valve opening state 161.

  For this reason, it is possible to prevent pressure accumulation in the oil passage groove 141 when the valve is closed, and it is possible to smoothly discharge the oil when the valve is opened.

DESCRIPTION OF SYMBOLS 1 Solenoid valve 41 Sleeve 54 Output port 55 Discharge port 82 Discharge side small diameter recessed part 101 Spool 102 Shaft part 105 Third valve part 141 Oil passage groove 142 Upstream side structure part 143 Downstream side structure part 151 Seal surface 152 Valve closed state 161 Valve opening State 172 Valve opening area T Thickness dimension

Claims (3)

A spool having a large-diameter valve portion on the shaft is moved in the sleeve to control the communication state between a predetermined port provided on the sleeve and the discharge port, and the discharge port is connected to the inner surface of the sleeve. In a solenoid valve in which a concave portion that communicates is formed over the entire circumference,
An oil passage groove is provided on the downstream side of the valve portion over the entire circumference to form an upstream configuration portion upstream of the oil passage groove and a downstream configuration portion downstream.
When forming the closed state in which the predetermined port and the discharge port are closed, the seal surface inside the sleeve located between the predetermined port and the discharge port is opposed to the peripheral surface of the upstream component. While sealing between the predetermined port and the discharge port,
When the upstream component is moved toward the recess to form a valve open state in which the predetermined port communicates with the discharge port, the oil passage groove communicates with the recess, and the upstream component The solenoid valve characterized in that the dimension of the upstream component portion is set so that the space on the upstream side and the discharge port communicate with each other via the recess and the oil passage groove.   2. The opening area formed by the oil passage groove is set to be equal to or larger than a valve opening area formed between the upstream component and the end of the recess in the valve open state. The solenoid valve described.   The electromagnetic valve according to claim 1 or 2, wherein the oil passage groove is always in communication with the discharge port from the closed state to the open state.

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