Solenoid valve

Abstract

To provide a solenoid valve capable of preventing its damage due to the wear of a valve element and a case of a solenoid or the generation of striking sound when opening the valve.SOLUTION: A solenoid valve 1 includes a solenoid 2 having a case 24, a flow path member 4, and a columnar valve element 5 stored in a valve element storage part 49 of the flow path member 4 and adapted to be moved together with a plunger 22 of the solenoid 2 to open / close a flow path. In the valve element 5, a first seat member 61 is arranged with which the plunger 22 has contact. In the case 24 of the solenoid 2, a second seat member 62 is arranged with which the plunger 22 has contact. The elastic coefficient of the first seat member 61 is greater than the elastic coefficient of the valve element 5, and the elastic coefficient of the second seat member 62 is smaller than the elastic coefficient of the case 24.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a solenoid valve. [Background technology]

[0002] There is known a solenoid valve that switches the flow of a fluid such as gas, water, or oil, that is, a solenoid valve that switches between passing and blocking the fluid (see, for example, Patent Document 1). The solenoid valve described in Patent Document 1 is mounted, for example, on a vehicle equipped with an internal combustion engine such as an engine, and can switch between passing and blocking blow-by gas. The solenoid valve described in Patent Document 1 includes a nozzle portion having a valve body that opens and closes a flow path through which a fluid passes, and a solenoid portion having a plunger that moves the valve body when excited. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-56419 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional solenoid valves, the plunger comes into direct contact with the valve body, and if the valve body is made of a resin material and the plunger is made of a metal material, the valve body may wear out and be damaged. Meanwhile, the end of the plunger opposite the valve body comes into direct contact with a yoke disposed in the solenoid, generating a slapping sound when the valve is opened. An object of the present invention is to provide a solenoid valve that can prevent damage due to wear of the valve body and solenoid case, and the generation of hitting noise when the valve is opened. [Means for solving the problem]

[0005] One aspect of the solenoid valve of the present invention includes a solenoid having a cylindrical bobbin having a through hole passing through in the axial direction, a plunger inserted into the through hole and supported so as to be movable in the axial direction, a coil wound around the outer periphery of the bobbin and generating a magnetic force when energized to move the plunger in the axial direction, and a case accommodating the bobbin, the plunger, and the coil, and a flow path member connected to one axial side of the solenoid, the flow path member including a first flow path, a second flow path, a relay flow path connecting the first flow path and the second flow path, and a valve body accommodating portion having a cylindrical space connected to the relay flow path, and the valve body Accommodation a columnar valve body that is accommodated in a case and moves in the axial direction together with the plunger to open and close the relay flow path; a first seat member that is disposed on the other axial side of the valve body and comes into contact with the plunger; a second seat member that is disposed on the case of the solenoid on the axial opposite side of the first seat member via the plunger and comes into contact with the plunger; and a biasing member that is provided on one axial side of the valve body and biases the valve body toward the other axial side. 、 The elastic modulus of the second sheet member is smaller than the elastic modulus of the case. the case includes a cylindrical body portion extending along the axial direction and a wall portion closing the other axial side of the body portion, the second seat member is disposed in contact with one axial side of the wall portion, the solenoid further includes a cylindrical yoke disposed between the bobbin and the plunger, the yoke includes a step portion recessed toward one axial side on an end surface on the other axial side, and the second seat member is disposed in a space formed by the step portion of the yoke and the wall portion of the case. It is characterized by: Effect of the Invention

[0006] According to one aspect of the solenoid valve of the present invention, it is possible to prevent damage due to wear of the valve body and the solenoid case, and to prevent the generation of hitting noise when the valve is opened. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of a usage state of a solenoid valve of the present invention (open state). [Diagram 2] FIG. 2 is a diagram showing an example of a usage state of the solenoid valve of the present invention (closed state). [Diagram 3] FIG. 3 is a cross-sectional view (open state) showing one embodiment of a solenoid valve of the present invention. [Figure 4] FIG. 4 is a front view showing the configuration of the flange portion. [Diagram 5]FIG. 5 is a cross-sectional view (closed state) showing another configuration example of the first guide portion. [Figure 6] FIG. 6 is a cross-sectional view (closed state) showing another configuration example of the first guide portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of a solenoid valve of the present invention will be described with reference to FIGS. In the following description, for the sake of convenience, three mutually orthogonal axes are set as the X-axis, the Y-axis, and the Z-axis. As an example, the XY plane including the X-axis and the Y-axis is horizontal, and the Z-axis is vertical. In addition, the X-axis direction is sometimes referred to as the "axial direction (axis O1 direction)", the radial direction centered on the axis O1 is sometimes simply referred to as the "radial direction", and the circumferential direction centered on the axis O1 is sometimes simply referred to as the "circumferential direction".

[0009] The positive side in the X-axis direction corresponds to "one axial side", and the negative side in the X-axis direction corresponds to "the other axial side". In this specification, the terms "up-down direction," "horizontal direction," "upper side," and "lower side" are simply terms used to describe the relative positional relationships of each part. Therefore, the actual positional relationships of each part may differ from the positional relationships indicated by these terms.

[0010] As shown in FIGS. 1 and 2, a solenoid valve 1 is mounted on a vehicle 100 equipped with an internal combustion engine 10 such as an engine. The internal combustion engine 10 comprises a housing 11 having a combustion chamber 111, a crank chamber 112 and a buffer chamber 113, a piston 12 movably disposed within the combustion chamber 111, and a crank 13 disposed within the crank chamber 112 for converting the reciprocating motion of the piston 12 into rotational motion. In addition, within the housing 11 , the crank chamber 112 and the buffer chamber 113 are connected via an internal flow passage 114 .

[0011] An external flow passage 14 is connected to the combustion chamber 111 from the outside of the housing 11. An electromagnetic valve 15, which is a throttle valve, is provided midway in the external flow passage 14. The external flow passage 14 on the downstream side of the solenoid valve 15 and the crank chamber 112 are connected via a first auxiliary flow passage 16 . A solenoid valve 17, which is a PCV valve, is provided in the middle of the first auxiliary flow path 16.

[0012] The upstream side of the solenoid valve 15 of the external flow path 14 is connected to the buffer chamber 113 via a second auxiliary flow path 18. The solenoid valve 1 of the present invention is installed in the second auxiliary flow path 18 at the boundary with the external flow path 14. The solenoid valve 1 is a valve that switches between opening and closing the external flow path 14. This solenoid valve 1 opens the external flow path 14 (see FIG. 1) during normal driving of the vehicle 100, and closes the external flow path 14 (see FIG. 2) upon detection of a leak such as a leak of the air-fuel mixture AR (hereinafter also simply referred to as a "leak").

[0013] 1, in the open state, the air-fuel mixture AR passes through the external flow passage 14 and flows into the combustion chamber 111, where it is burned. The piston 12 moves due to the combustion of the air-fuel mixture AR. Further, a portion of the mixture AR passing through the external passage 14 flows into the second auxiliary passage 18 from the middle of the external passage 14, passes through the buffer chamber 113 and the internal passage 114 in this order, and reaches the crank chamber 112. The air-fuel mixture AR that has flowed into the crank chamber 112 can return to the external passage 14 via the first auxiliary passage 16.

[0014] As shown in FIG. 2, in the closed state, the supply of the air-fuel mixture AR to the internal combustion engine 10 is stopped. When the pressure in the combustion chamber 111 becomes high due to the combustion of the air-fuel mixture AR, a part of the blow-by gas Q in the combustion chamber 111 flows over the piston 12 into the crank chamber 112 . Thereafter, the blow-by gas Q in the crank chamber 112 flows through the first auxiliary passage 16 into the external passage 14.

[0015] At this time, if no leakage occurs, the pressure in the crank chamber 112 will decrease over time. Then, if the pressure in the crank chamber 112 falls below the threshold value, it is determined that no leakage occurs. On the other hand, if a leak is occurring, the pressure in the crank chamber 112 will not decrease and will not fall below the threshold, or the pressure will decrease more slowly and will take time to fall below the threshold. In this case, it is determined that a leak is occurring.

[0016] 3, the solenoid valve 1 includes a solenoid 2 disposed on the negative side in the X-axis direction, and a valve mechanism 3 disposed on the positive side in the X-axis direction. The configuration of each part will be described below. The solenoid 2 includes a bobbin 21, a plunger 22, a coil 23, a case 24, a core 25, and a yoke 26.

[0017] The bobbin 21 is a cylindrical member having a through hole 211. The through hole 211 passes through along the X-axis direction. The inner diameter of the through hole 211 is constant along the X-axis direction. The bobbin 21 has a flange 212 that protrudes in the radial direction on the X-axis positive side, and a flange 213 that protrudes in the radial direction on the X-axis negative side. The bobbin 21 is made of various resin materials such as polyester and polyimide.

[0018] A coil 23 formed by winding a conductive wire is disposed on the outer periphery 214 of the bobbin 21. When electricity is applied to the coil 23, a magnetic circuit is formed by the bobbin 21, the core 25, and the yoke 26, generating a magnetic force, which causes the plunger 22 to move along the X-axis direction.

[0019] The core 25 and the yoke 26 are inserted into the through hole 211 of the bobbin 21, and the plunger 22 is further inserted inside these. In other words, the core 25 and the yoke 26 are disposed between the bobbin 21 and the plunger 22, respectively. The core 25 is disposed on the positive side in the X-axis direction, and the yoke 26 is disposed on the negative side in the X-axis direction.

[0020] The core 25 is generally cylindrical and disposed along the X-axis direction. The yoke 26 is also generally cylindrical and disposed along the X-axis direction. The core 25 and the yoke 26 are made of a soft magnetic material (soft magnetic metal material) such as iron, for example, so that a magnetic circuit capable of moving the plunger 22 sufficiently can be generated.

[0021] Furthermore, the solenoid 2 has a connecting member 201 that connects the core 25 and the yoke 26 in a state in which they are spaced apart in the X-axis direction within the through hole 211. The connecting member 201 is cylindrical, and an end of the core 25 on the negative side in the X-axis direction and an end of the yoke 26 on the positive side in the X-axis direction are fitted into the connecting member 201. The connecting member 201 is made of a material that is non-magnetic and has rust resistance (for example, a metal material such as austenitic stainless steel).

[0022] The plunger 22 is disposed across the core 25 and the yoke 26, and is supported so as to be alternately movable (ie, reciprocatable) between the positive side and the negative side along the X-axis direction. The plunger 22 has a cylindrical plunger body 222 and a plunger pin 221 inserted into the plunger body 222. The plunger pin 221 protrudes on both the positive and negative sides in the X-axis direction.

[0023] An end face 261 of the yoke 26 on the negative side in the X-axis direction is formed with a step portion 262 recessed toward the positive side in the X-axis direction. In the plunger 22, the plunger pin 221 is supported by a bush 202 in the core 25, and the plunger pin 221 is supported by a bush 203 in the yoke 26. This allows the plunger 22 to reciprocate smoothly.

[0024] The case 24 houses the bobbin 21, the plunger 22, the coil 23, the core 25, and the yoke 26. The case 24 has a case main body 241, a connector member 242, and a ring member 243. The case body 241 is a cylindrical member with a bottom, which includes a cylindrical body 241a extending along the X-axis direction and a wall 241b closing the X-axis negative side of the body 241a. The yoke 26 is in contact with the wall 241b from the X-axis positive side.

[0025] In this state, a second seat member 62 is disposed in a space formed by the step portion 262 of the yoke 26 and the wall portion 241b of the case body 241. The second seat member 62 is disposed on the opposite side in the X-axis direction, via the plunger 22, of a first seat member 61 disposed in the valve body 5 described later. When the valve body 5 opens the relay flow passage 44 (open state), the plunger pin 221 comes into contact (collides) with the second seat member 62, thereby restricting the movement of the plunger 22 to the negative side in the X-axis direction.

[0026] In addition, the elastic modulus of the second sheet member 62 is smaller than that of the case 24. This makes it possible to absorb wear of the case 24 caused by the plunger pin 221 and impact noise (banging noise) that may occur when the plunger pin 221 directly impacts the case 24 (when the valve is opened), that is, to prevent the occurrence of impact noise. Furthermore, by positioning the second sheet member 62 so as to contact the positive side of the X-axis direction of the wall portion 241b, particularly by positioning it in the space formed by the step portion 262 and the wall portion 241b, the second sheet member 62 can be firmly fixed to the case 24. The specific value of the elastic modulus of the second sheet member 62 is preferably 200 MPa or more, and more preferably 200 to 1000 MPa, in which case the effect of reducing the occurrence of the above-mentioned hitting sounds is further enhanced.

[0027] It is preferable that the coefficient of friction of the plunger pin 221 (plunger 22) with respect to the second sheet member 62 is smaller than the coefficient of friction of the plunger pin 221 with respect to the wall portion 241b of the case 24 (case main body 241). This allows the plunger pin 221 to be easily restored to its original position even if it comes into contact with the second sheet member 62 at a position displaced from the second sheet member 62. The second sheet member 62 is preferably made of a resin material. This makes it easier to obtain a sheet member that can more effectively exert the above-mentioned effects. In particular, the resin material is preferably a fluorine-based resin material. In this case, the friction coefficient of the second sheet member 62 can be further reduced.

[0028] The ring member 243 has an annular shape, and is disposed radially outward of the core 25 and concentric with the core 25. The ring member 243 is in contact with the core 25 from the X-axis direction positive side. Like the core 25, the case body 241 and the ring member 243 are made of a soft magnetic metal material such as iron. A connector (not shown) that supplies electricity to the coil 23 is connected to the connector member 242. Like the bobbin 21, the connector member 242 is made of, for example, a resin material.

[0029] The solenoid 2 also has a gasket 204 arranged within the case 24 between the ring member 243 and the flange 212 of the bobbin 21, and a gasket 205 arranged between the wall portion 241b of the case body 241 and the flange 213 of the bobbin 21. The gasket 204 is ring-shaped and is disposed on the outer periphery of the core 25, concentrically with the core 25. The gasket 204 is in a compressed state between the ring member 243 and the flange 212 of the bobbin 21. As a result, the gasket 204 hermetically seals the gap between the ring member 243 and the flange 212.

[0030] The gasket 205 is ring-shaped and disposed radially outward of the yoke 26 and concentric with the yoke 26. The gasket 205 is compressed between the wall 241b of the case main body 241 and the flange 213 of the bobbin 21. As a result, the gasket 205 hermetically seals the gap between the wall 241b and the flange 213. The gaskets 204 and 205 are made of an elastic material, which is not particularly limited and may be, for example, various rubber materials such as urethane rubber and silicone rubber.

[0031] The valve mechanism 3 includes a flow path member 4 , a valve body 5 , a coil spring (biasing member) 31 , and a gasket 33 . The flow path member 4 is connected to the X-axis direction positive side of the solenoid 2. Like the bobbin 21, the flow path member 4 is made of, for example, a resin material.

[0032] In the flow path member 4, a first flow path 41 and a second flow path 42 are formed. The first flow passage 41 extends in the Z-axis direction (a direction intersecting the X-axis direction) and opens toward the negative side in the Z-axis direction. The first flow passage 41 is connected to the external flow passage 14, and is connected to the combustion chamber 111 via the external flow passage 14. Further, a gasket 45 is fitted from the outside of the flow path member 4 to airtightly seal between the flow path member 4 and the piping that constitutes the external flow path .

[0033] The second flow path 42 also extends in the Z-axis direction (a direction intersecting the X-axis direction) and opens toward the Z-axis direction positive side. The central axis O42 of the second flow passage 42 is located on the positive side in the X-axis direction with respect to the central axis O41 of the first flow passage 41. Moreover, the second flow path 42 is connected to the second auxiliary flow path 18, for example.

[0034] Furthermore, a valve body accommodating portion 49 having a cylindrical space 48 with a constant diameter along the X-axis direction is formed in the flow path member 4. The valve body 5 is accommodated in this cylindrical space 48 so as to be movable along the X-axis direction. The first flow path 41 is connected to the cylindrical space 48 from the negative side in the Z axis direction via the opening 410, and the second flow path 42 is connected to the cylindrical space 48 from the X side in the X axis direction via the relay flow path 44. Therefore, the first flow path 41 and the second flow path 42 are connected to each other via the relay flow path 44 and the cylindrical space 48. For example, if the internal combustion engine 10 in which the solenoid valve 1 is installed is a naturally aspirated engine, as shown in FIG. 3, the blow-by gas Q flows from the first flow passage 41, through the cylindrical space 48 and the relay flow passage 44 in that order, toward the second flow passage 42.

[0035] 3, the flow path member 4 has a ring-shaped connecting portion 32 at its end on the negative side in the X-axis direction. The case body 241 of the solenoid 2 is fixed to the connecting portion 32 by, for example, crimping. This allows the solenoid 2 and the flow path member 4 to be connected to each other. A gasket 33 is disposed in a compressed state between the connecting portion 32 and the ring member 243 of the solenoid 2. The gasket 33 is ring-shaped and disposed concentrically with the cylindrical space .

[0036] The gasket 33 provides an airtight seal between the connecting portion 32 and the ring member 243. As a result, leakage of the blow-by gas Q from between the flow path member 4 and the solenoid 2 can be prevented. Like the gasket 204, the gasket 33 is made of an elastic material such as urethane rubber.

[0037] The valve element 5 can move along the X-axis direction together with the plunger 22. The movement of the valve element 5 can open and close the relay flow passage 44. When the valve body 5 opens the relay passage 44 (open state), the blow-by gas Q can pass from the first passage 41 to the second passage 42. Here, FIG. 3 shows the valve body 5 in the open state. On the other hand, when the valve body 5 blocks the relay passage 44 (closed state), the passage of the blow-by gas Q from the first passage 41 to the second passage 42 is blocked.

[0038] The valve body 5 has a main body portion 51 and a valve portion 53 . The main body 51 is columnar and disposed in the valve body accommodating portion 49 (cylindrical space 48) with its central axis aligned along the X-axis direction. The main body 51 is made of a lightweight metal material such as aluminum. The main body portion 51 has a first guide portion 513 and a second guide portion 514 . The first guide portion 513 is provided on the X-axis direction positive side of the outer periphery of the main body portion 51. The first guide portion 513 is configured with an annular flange portion provided continuously along the circumferential direction of the main body portion 51. In this embodiment, the outer diameter of the first guide portion 513 is constant along the X-axis direction.

[0039] This first guide portion 513 can come into contact with the valve body accommodating portion 49. As a result, when the valve body 5 moves along the X-axis direction, it slides while being guided by the inner circumferential surface 490 of the valve body accommodating portion 49. This allows the valve body 5 to move stably, and also makes it possible to scrape out deposits adhering to the inner circumferential surface 490 into the first flow path 41. As a result, it is possible to prevent a decrease in the operating accuracy of the valve body 5. The direction in which the first flow passage 41 extends is not limited to the Z-axis direction (vertical direction), and may be inclined at a predetermined angle with respect to the Z-axis direction. This allows the deposit scraped out by the first guide portion 513 to be reliably discharged by the first flow passage 41. From the viewpoint of further improving the effect of discharging deposits into the first flow passage 41, the predetermined angle is preferably 45° or less, and more preferably 30° or less.

[0040] The second guide portion 514 is provided on the outer periphery of the main body portion 51 on the negative side in the X-axis direction relative to the first guide portion 513 . The second guide portion 514 can come into contact with the valve body accommodating portion 49. As a result, when the valve body 5 moves along the X-axis direction, it slides while being guided by the inner circumferential surface 490 of the valve body accommodating portion 49. This allows the valve body 5 to move more stably. When the valve body 5 closes the relay flow passage 44 (closed state), the second guide portion 514 is located on the negative side in the X-axis direction of the opening 410 where the first flow passage 41 connects to the cylindrical space 48. This makes it possible to reliably prevent the valve body 5 from falling off into the first flow passage 41.

[0041] The second guide portion 514, like the first guide portion 513, may be composed of a flange portion provided continuously along the circumferential direction of the main body portion 51, or may be composed of a plurality of protrusions (small pieces) arranged at intervals in the circumferential direction. In the former case, it is possible to improve the stability of the posture of the valve body 5 when it moves. Also, it is possible to prevent the deposit from moving beyond the second guide portion 514 toward the solenoid 2 side. In the latter case, the contact area between the second guide portion 514 and the inner circumferential surface 490 of the valve body accommodating portion 49 is reduced, making it easier to improve the slidability of the valve body 5.

[0042] In the former case, the flange portion (first guide portion 513 and second guide portion 514) is preferably configured in a circular ring (disk) shape as shown in FIG. 4(a), but may have other configurations. Specifically, the flange portion can be composed of a plurality (four in the illustrated configuration) of arc-shaped flange portions 513a arranged at a distance from each other along the circumferential direction of the main body portion 51 (see FIG. 4(b)), or can be composed of a plurality (four in the illustrated configuration) of connecting portions 513c protruding radially outward from the main body portion 51 and a ring portion 513b connected to the connecting portions 513c (see FIG. 4(c)).

[0043] Moreover, the inner circumferential surface 490 of the valve body accommodating portion 49 forms a flat surface. In other words, there are no irregularities or steps on the inner circumferential surface 490. This allows the first guide portion 513 to come into contact with the inner circumferential surface 490 evenly along the circumferential direction. Also, the first guide portion 513 can slide smoothly along the X-axis direction. This can further enhance the effect of scraping out deposits.

[0044] Furthermore, a recess 515 recessed toward the X-axis positive side is formed at the end portion on the X-axis negative side of the main body 51. A first sheet member 61 is disposed in contact with the bottom surface of the recess 515. The end of the plunger pin 221 on the X-axis direction positive side enters the recess 515 and presses the valve body 5 (main body portion 51) toward the X-axis direction positive side via the first seat member 61. This pressing of the plunger 22 moves the valve body 5, and the relay flow path 44 can be brought into a closed state.

[0045] At this time, since the plunger pin 221 does not directly contact the main body portion 51, wear of the main body portion 51 can be suitably prevented regardless of the type of material that the main body portion 51 is made of. The elastic modulus of the first seat member 61 is greater than the elastic modulus of the main body portion 51 (valve body 5). The pressing force from the plunger pin 221 can be transmitted to the main body portion 51 without attenuation. A specific value of the elastic modulus of the first sheet member 61 is preferably 200 MPa or more, and more preferably 200 to 1000 MPa, in which case the effect of transmitting the pressing force is further improved.

[0046] It is preferable that the coefficient of friction of the plunger pin 221 (plunger 22) with respect to the first seat member 61 is smaller than the coefficient of friction of the plunger pin 221 with respect to the main body 51 (valve body 5). This allows the plunger pin 221 to be easily restored to its original position even if it comes into contact with the first seat member 61 at a position displaced from the first seat member 61. The first sheet member 61 is preferably made of a resin material. This makes it easier to obtain a sheet member that can more effectively exert the above-mentioned effects. In particular, the resin material is preferably a fluorine-based resin material. In this case, the friction coefficient of the first sheet member 61 can be further reduced.

[0047] Furthermore, the surface of the first seat member 61 on the negative side in the X-axis direction (the surface in contact with the plunger pin 221) is located between the first guide portion 513 and the second guide portion 514 in the X-axis direction. With this configuration, the plunger pin 221 can be brought into contact with a position on the more positive side in the X-axis direction of the valve body 5 (a position closer to the center of gravity). Therefore, the force from the plunger pin 221 can be stably transmitted to the valve portion 53 via the valve body 5.

[0048] A valve portion 53 is disposed on the X-axis direction positive side of the main body portion 51. The valve portion 53 can approach the relay flow path 44 to close the relay flow path 44 or move away from the relay flow path 44 to open the relay flow path 44 as the plunger 22 moves. That is, the valve portion 53 has the function of opening and closing the relay flow path 44. The valve portion 53 is fixed to a mounting portion 511 that protrudes from the main body portion 51 toward the X-axis direction positive side. Like the gasket 204, the valve portion 53 is made of an elastic material such as urethane rubber.

[0049] Moreover, the valve portion 53 is, for example, columnar. The outer diameter of the valve portion 53 is smaller than the outer diameter of the main body portion 51, decreases from the middle toward the positive side in the X-axis direction, and is smaller than the inner diameter of the relay flow passage 44 at the end. This prevents the valve portion 53 from contacting the inner circumferential surface 490 of the valve body accommodating portion 49, and prevents the smooth movement of the valve body 5 from being hindered. Furthermore, in the closed state, the end of the valve portion 53 on the X-axis direction positive side enters the relay flow passage 44, so that the relay flow passage 44 can be sealed with higher airtightness.

[0050] A coil spring 31 is disposed along the X-axis direction on the X-axis positive side of the valve body 5. The coil spring 31 is a biasing member that biases the valve body 5 toward the X-axis negative side. When the current supply to the coil 23 is released, the valve body 5 moves toward the negative side in the X-axis direction due to the biasing force of the coil spring 31. This causes the valve portion 53 to move away from the relay flow path 44, opening the relay flow path 44 and enabling the valve portion 53 to be in an open state. At this time, the coil spring 31 presses the plunger pin 221 (plunger 22) toward the second seat member 62 via the valve body 5.

[0051] The coil spring 31 is disposed concentrically with the valve body 5 on the outer periphery of the valve body 5. The coil spring 31 is in a compressed state with its X-axis positive side in contact with the end face 491 on the X-axis positive side of the valve body accommodating portion 49 and its X-axis negative side in contact with the first guide portion (brim portion) 513 (face 5131 on the X-axis positive side) of the valve body 5. This allows the coil spring 31 to stably bias the valve body 5 without excess or deficiency. Moreover, by using the first guide portion (flange portion) 513 as a spring seat, it is possible to reduce the size of the flow path member 4. Furthermore, it is possible to increase the contact area between the coil spring 31 and the first guide portion 513, thereby reducing the area of ​​the region where deposits can adhere. In addition, by making the first guide portion 513 a spring seat, it is possible to contribute to the miniaturization of the solenoid valve 1 and also to reduce the area on the X-axis direction positive side of the first guide portion 513 of the valve body accommodating portion 49 where deposits can adhere.

[0052] The distance between the first guide portion 513 and the inner circumferential surface 490 of the valve body accommodating portion 49 is preferably smaller than the wire diameter of the coil spring 31. This makes it possible to suitably prevent the coil spring 31 from entering the gap between the first guide portion 513 and the inner circumferential surface 490 of the valve body accommodating portion 49 and coming off the valve body 5. However, it is preferable that the distance between the first guide portion 513 and the inner circumferential surface 490 of the valve body accommodating portion 49 is as large as possible as long as it is smaller than the wire diameter of the coil spring 31. This allows a portion of the deposit to move from the first guide portion 513 to the negative side in the X-axis direction, thereby further reducing the amount of deposit remaining on the positive side in the X-axis direction from the first guide portion 513.

[0053] The outer diameter of the first guide portion 513 is preferably larger than the inner diameter of the coil spring 31. This makes it possible to more reliably prevent the coil spring 31 from entering the gap between the first guide portion 513 and the inner circumferential surface 490 of the valve body accommodating portion 49. 5, in the closed state, a portion of the first guide portion 513 in the X-axis direction is exposed to the opening 410 where the first flow passage 41 opens into the cylindrical space 48. With this configuration, the effect of scraping out the deposits into the first flow passage 41 can be further improved.

[0054] The first guide portion 513 may be configured so that its length along the X-axis direction is reduced and it is located within the valve body accommodating portion 49 in the closed state. With this configuration, it is possible to reliably prevent the valve body 5 from falling off from the valve body accommodating portion 49. 6, the axial length of the first guide portion 513 may be formed to decrease radially outward. In this case, the contact between the first guide portion 513 and the inner circumferential surface 490 of the valve body accommodating portion 49 is linear contact (reducing the contact area), and it is possible to prevent a decrease in the slidability of the valve body 5.

[0055] In particular, it is preferable that surface 5131 on the X-axis direction positive side of first guide part 513 is approximately perpendicular to the X-axis direction, and surface 5132 on the X-axis direction negative side is inclined with respect to the X-axis direction. This allows first guide part 513 to satisfactorily exhibit the effect of scraping out deposits and the function of the spring seat. When the first guide portion 513 is configured to be located inside the valve body accommodating portion 49 in the closed state, the distance (L in FIG. 6) between the surface 5131 on the X-axis direction positive side and the opening 410 is preferably smaller than the wire diameter of the coil spring 31. This allows a good balance between the effect of preventing the valve body 5 from falling out of the valve body accommodating portion 49 and the effect of scraping out deposits.

[0056] Although the solenoid valve of the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to this, and each part constituting the solenoid valve may be replaced with any other part capable of exerting the same function. In addition, any other component may be added. In addition, in the above embodiment, the solenoid valve 1 is mounted on a vehicle 100 equipped with an internal combustion engine 10 such as an engine, but the application of the solenoid valve is not limited to the vehicle 100. In addition, the fluid that is switched between passing and blocking by the solenoid valve 1 is not limited to gas (blow-by gas Q), but may be a liquid or a mixture of gas and liquid.

[0057] In addition, in the above embodiment, the solenoid valve 1 is configured so that the blow-by gas Q flows from the first flow path 41 to the second flow path 42, but depending on the usage state of the solenoid valve 1, the blow-by gas Q can also be made to flow from the second flow path 42 to the first flow path 41. [Explanation of symbols]

[0058] 1... solenoid valve, 2... solenoid, 21... bobbin, 211... through hole, 212... flange, 213... flange, 214... outer periphery, 22... plunger, 221... plunger pin, 222... plunger body, 23... coil, 24... case, 241... case body, 241a... body, 241b... wall, 242... connector member, 243... ring member, 25... core, 26... yoke, 262... step, 201... connecting member, 202... bush, 203... bush, 3... valve mechanism, 31... coil spring, 32... connecting portion, 33... gasket, 4... flow path member, 41... first flow path, 410... opening, 42... second flow path, 44... relay flow path, 45... gasket, 48... cylindrical space, 49... valve body accommodating portion, 490... Inner peripheral surface, 491... end surface, 5... valve body, 51... main body portion, 511... mounting portion, 513... first guide portion (flange portion), 5131, 5132... surface, 513a... flange portion, 513b... ring portion, 513c... connecting portion, 514... second guide portion (projection portion), 515... recess, 53... valve portion, 61... first seat member, 62... second seat member, 10... internal combustion engine, 11... valve Buffer chamber, 111...combustion chamber, 112...crank chamber, 113...buffer chamber, 114...internal passage, 12...piston, 13...crank, 14...external passage, 15...solenoid valve, 16...first auxiliary passage, 17...solenoid valve, 18...second auxiliary passage, 100...vehicle, AR...air-fuel mixture, O1...shaft, O41...central axis, O42...central axis, Q...blow-by gas, L...distance

Claims

1. a solenoid including a cylindrical bobbin having a through hole passing through in an axial direction, a plunger inserted into the through hole and supported so as to be movable in the axial direction, a coil wound around an outer periphery of the bobbin and generating a magnetic force when energized to move the plunger in the axial direction, and a case for housing the bobbin, the plunger, and the coil; a flow path member connected to one axial side of the solenoid, the flow path member including a first flow path, a second flow path, a relay flow path connecting the first flow path and the second flow path, and a valve body accommodating portion having a cylindrical space connected to the relay flow path; a columnar valve body that is accommodated in the valve body accommodating portion and moves together with the plunger in an axial direction to open and close the relay flow path; a first seat member that is disposed on the other axial side of the valve body and that comes into contact with the plunger; a second seat member that is disposed on the case of the solenoid on an axially opposite side of the first seat member via the plunger and that comes into contact with the plunger; a biasing member provided on one axial side of the valve body and biasing the valve body toward the other axial side, the elastic modulus of the second sheet member is smaller than the elastic modulus of the case, The case includes a cylindrical body portion extending along an axial direction and a wall portion closing the other axial side of the body portion, The second sheet member is disposed in contact with one axial side of the wall portion, The solenoid further includes a cylindrical yoke disposed between the bobbin and the plunger. the yoke has a step portion recessed toward one axial direction on an end surface on the other axial direction side, The solenoid valve, wherein the second seat member is disposed in a space formed by the step portion of the yoke and the wall portion of the case.

2. The valve body has a recessed portion recessed toward one side in the axial direction at an end portion on the other side in the axial direction, 2. The solenoid valve according to claim 1, wherein the first seat member is disposed within the recess.

3. 3. The solenoid valve according to claim 1, wherein a coefficient of friction between the plunger and the first seat member is smaller than a coefficient of friction between the plunger and the valve body.

4. 4. The solenoid valve according to claim 1, wherein a coefficient of friction of the plunger with respect to the second seat member is smaller than a coefficient of friction of the plunger with respect to the case.

5. The valve body further has a first guide portion that protrudes radially outward on one axial side thereof and is guided by an inner circumferential surface of the valve body accommodating portion, and a second guide portion that is provided on the other axial side thereof and spaced apart from the first guide portion, protrudes radially outward, and is guided by the inner circumferential surface of the valve body accommodating portion, The solenoid valve according to any one of claims 1 to 4, wherein the other axial surface of the first seat member is located between the first guide portion and the second guide portion in the axial direction.

6. The solenoid valve according to any one of claims 1 to 5, wherein at least one of the first seat member and the second seat member has an elastic modulus of 200 MPa or more.

7. 7. The solenoid valve according to claim 1, wherein at least one of the first seat member and the second seat member is made of a resin material.

8. 8. The solenoid valve according to claim 7, wherein the resin material is a fluorine-based resin material.

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