Solenoid valve

Abstract

To provide an electromagnetic valve which is enhanced in sealing performance even in the case that a flow passage is in an open state while making a valve body stably slide.SOLUTION: An electromagnetic valve 1 comprises: a solenoid 2 having a plunger 22 which is movably supported along an axis O1; a flow passage member 4 having a fluid passage flow path 46 and a valve body accommodation part 49; and a columnar valve body 5 arranged at the valve body accommodation part 49, moving along the axis O1 direction together with the plunger 22, and switchable in an open state and a closed state. The flow passage member 4 comprises an abutment part abutting on the valve body 5 and an energization member 31 for energizing the valve body 5 in the valve body accommodation part 49. The valve body 5 has a diameter-expanded part 51 at the outside of a radial direction, the diameter-expanded part 51 has an opposing face part 511 opposing the abutment part in at least the axis O1 direction, and the opposing face part 511 comes into contact with the abutment part in the open state.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, i.e., 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 a conventional solenoid valve, when the flow path is open, fluid leaks from a gap between the valve body and the guide that slides the valve body, and there is a risk that the solenoid portion will be damaged by the influence of the fluid. An object of the present invention is to provide a solenoid valve capable of preventing damage to a solenoid portion by improving sealing performance even when a flow path is in an open state. [Means for solving the problem]

[0005] a solenoid including 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, and 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; a fluid passage including a first passage, a second passage, and a relay passage disposed between the first passage and the second passage and connecting the first passage and the second passage, and a valve body accommodating portion having a cylindrical space connected to the relay passage, the fluid passage being connected to the solenoid; and a columnar valve body that is disposed in the valve body accommodating portion, moves in the axial direction together with the plunger, and is switchable between an open state and a closed state between the first flow path and the second flow path, the flow path member is provided with an abutment portion that abuts against the valve body within the valve body accommodating portion, and a biasing member that biases the valve body toward the other axial side, the valve body has an enlarged diameter portion that protrudes radially outward on one axial side, the enlarged diameter portion has an opposing surface portion that faces at least the abutment portion in the axial direction, and the opposing surface portion contacts the abutment portion in the open state. Effect of the Invention

[0006] According to one aspect of the solenoid valve of the present invention, the sealing performance can be improved even when the flow path is in an open state, thereby preventing damage to the solenoid portion. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of a usage state of a solenoid valve (open state) of the present invention. [Diagram 2] FIG. 2 is a diagram showing an example of a usage state of the solenoid valve (closed state) of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view showing an embodiment of a solenoid valve of the present invention. [Figure 4] FIG. 4 is an enlarged view of the area [A] enclosed by the two-dot chain line in FIG. [Diagram 5] FIG. 5 is a cross-sectional view showing another embodiment of the solenoid valve of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of the solenoid valve of the present invention will be described with reference to Figs. 1 to 4. In the following, for convenience of description, 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. The direction parallel to the X-axis is sometimes referred to as the "axial direction (axis O1 direction)", the radial direction centered on this axis is sometimes simply referred to as the "radial direction", and the circumferential direction centered on the axis is sometimes simply referred to as the "circumferential direction". In addition, the positive side of the X-axis direction may be sometimes referred to as the "one axial side" or simply as the "one side", and the negative side of the X-axis direction may be sometimes referred to as the "other axial side" or simply as the "other side". In this specification, the vertical direction, the horizontal direction, the upper side, and the lower side are names simply for describing the relative positional relationship of each part, and the actual positional relationship, etc. may be a positional relationship, etc. other than the positional relationship, etc. indicated by these names.

[0009] 1 and 2, the solenoid valve 1 is mounted on and used in a vehicle 100 equipped with an internal combustion engine 10 such as an engine. The internal combustion engine 10 includes a housing 11 having a combustion chamber 111, a crank chamber 112, and a buffer chamber 113, a piston 12 movably provided within the combustion chamber 111, and a crank 13 provided 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 .

[0010] An external flow passage 14 is connected to the combustion chamber 111 from the outside of the housing 11. A solenoid valve 15, which is a throttle valve, is provided midway in the external flow passage 14. The downstream side of the solenoid valve 15 of the external flow passage 14 and the crank chamber 112 are connected via a first auxiliary flow passage 16. In the middle of the first auxiliary flow passage 16, a solenoid valve 17 serving as a PCV valve is provided.

[0011] The upstream side of the solenoid valve 15 of the external flow passage 14 is connected to the buffer chamber 113 via a second auxiliary flow passage 18. The solenoid valve 1 of the present invention is installed in the second auxiliary flow passage 18 at the boundary with the external flow passage 14. The solenoid valve 1 is a valve that switches the external flow passage 14 between open and closed. The solenoid valve 1 opens the external flow passage 14 (see FIG. 1) during normal driving of the vehicle 100, and closes the external flow passage 14 (see FIG. 2) upon detection of a leak of the air-fuel mixture AR or the like (hereinafter simply referred to as "leak").

[0012] As shown in Fig. 1, in the open state, the mixture AR passes through the external flow passage 14 and flows into the combustion chamber 111, where it is burned. This allows the piston 12 to move. In addition, a part of the mixture AR passing through the external flow passage 14 flows into the second auxiliary flow passage 18 from the middle of the external flow passage 14, and passes through the buffer chamber 113 and the internal flow passage 114 in this order, to reach the crank chamber 112. The mixture AR that has flowed into the crank chamber 112 can return to the external flow passage 14 via the first auxiliary flow passage 16.

[0013] As shown in FIG. 2, in the closed state, the supply of the mixture AR to the internal combustion engine 10 is stopped. Then, when the combustion chamber 111 becomes high pressure due to combustion, a part of the blow-by gas Q in the combustion chamber 111 flows over the piston 12 into the crank chamber 112. After that, the blow-by gas Q in the crank chamber 112 flows into the external flow path 14 through the first auxiliary flow path 16. At this time, if there is no leakage, the pressure in the crank chamber 112 decreases over time. Then, when the pressure in the crank chamber 112 falls below the threshold, it is determined that there is no leakage. On the other hand, if there is a leakage, the pressure in the crank chamber 112 does not decrease and does not fall below the threshold, or the decreasing tendency of the pressure becomes gentle and it takes time to fall below the threshold. In this case, it is determined that there is a leakage.

[0014] 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.

[0015] The bobbin 21 is a cylindrical member having a through hole 211. The through hole 211 passes through along an axis O1 direction parallel to the X-axis direction. The inner diameter of the through hole 211 is constant along the axis O1 direction. The bobbin 21 has a flange 212 protruding in the radial direction on one side, and a flange 213 protruding in the radial direction on the other side. The bobbin 21 is made of various resin materials such as polyester resin and polyimide resin.

[0016] An electrically conductive coil 23 is wound around the outer periphery 214 of the bobbin 21. When the coil 23 is energized, that is, when the coil 23 is energized, a magnetic circuit is formed by the bobbin 21, the core 25, and the yoke 26, and a magnetic force is generated. This allows the plunger 22 to move along the axis O1.

[0017] 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. The core 25 is disposed on one side in the direction of the axis O1, and the yoke 26 is disposed on the other side in the direction of the axis O1.

[0018] The core 25 is generally cylindrical and disposed parallel to the X-axis direction. The yoke 26 is also generally cylindrical and disposed parallel to the X-axis direction. The core 25 and the yoke 26 are made of a soft magnetic material such as iron, that is, made of a soft magnetic metal material. This allows a magnetic circuit to be generated that can move the plunger 22 sufficiently.

[0019] The solenoid 2 also has a connecting member 201 that connects the core 25 and the yoke 26 in a spaced-apart state within the through hole 211. The connecting member 201 is cylindrical, and the other end of the core 25 and one end of the yoke 26 are fitted inside the connecting member 201. The connecting member 201 is made of a non-magnetic, rust-resistant metal material, such as austenitic stainless steel.

[0020] The plunger 22 is disposed across the core 25 and the yoke 26, and is supported so as to be capable of alternately moving between one side and the other side along the direction of the axis O1, that is, so as to be capable of reciprocating motion. 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 to both one side and the other side in the direction of the axis O1. The other side of the yoke 26 is closed by a wall portion 262, and the plunger pin 221 comes into contact with, i.e. collides with, the wall portion 262, thereby restricting the movement limit of the plunger 22 to the other side. Furthermore, the plunger pin 221 of the plunger 22 is supported by a bush 202 within the core 25, and the plunger pin 221 is supported by a bush 203 within the yoke 26. This allows the plunger 22 to reciprocate smoothly.

[0021] 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 cylindrical and has a bottom. That is, the case body 241 is a cylindrical member having an opening 244 that opens on one side in the direction of the axis O1 and a wall portion 245 that closes the other side. The yoke 26 contacts the wall portion 245 from one side.

[0022] The ring member 243 has an annular shape and is disposed radially outside the core 25 and concentric with the core 25. The ring member 243 contacts the core 25 from one 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. The connector member 242 is connected to a connector (not shown) that supplies electricity to the coil 23. The connector member 242, like the bobbin 21, is made of, for example, a resin material.

[0023] 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 245 of the case body 241 and the flange 213 of the bobbin 21. The gasket 204 is ring-shaped and is disposed concentrically with the core 25 on the outer circumferential side of the core 25. The gasket 204 is in a compressed state between the ring member 243 and the flange 212 of the bobbin 21, thereby forming a seal between the ring member 243 and the flange 212.

[0024] The gasket 205 is ring-shaped and disposed radially outside the yoke 26 and concentric with the yoke 26. The gasket 205 is compressed between the wall 245 of the case body 241 and the flange 213 of the bobbin 21, thereby forming a seal between the wall 245 and the flange 213. The gaskets 204 and 205 are made of an elastic material. The elastic material is not particularly limited, and examples thereof include various rubber materials such as urethane rubber and silicone rubber.

[0025] The valve mechanism 3 includes a flow path member 4 , a valve body 5 , a spring 31 , a connecting member 32 , and a gasket 33 . The flow path member 4 is a member connected to the solenoid 2, and includes a fluid passage 46 therein through which the blow-by gas Q, which is a fluid, can pass, and a valve body accommodating portion 49 connected to the fluid passage 46. Similarly to the bobbin 21, the flow path member 4 is made of, for example, a resin material.

[0026] The fluid passing channel 46 has a first channel 41, a second channel 42, and a relay channel 44 that connects the first channel 41 and the second channel 42. The first flow passage 41 is provided along the Z-axis direction and opens toward the Z-axis direction negative side. The first flow passage 41 is connected to the external flow passage 14 and leads to the combustion chamber 111 via the external flow passage 14. A gasket 45 is fitted from the outside to the flow passage member 4 to seal between the flow passage member 4 and the piping that constitutes the external flow passage 14.

[0027] The second flow path 42 is also provided along the Z-axis direction and opens toward the Z-axis direction positive side. The central axis O42 of the second flow path 42 is located on the X-axis direction positive side with respect to the central axis O41 of the first flow path 41. The second flow path 42 is connected to, for example, the second auxiliary flow path 18.

[0028] Between the first flow passage 41 and the second flow passage 42, a relay flow passage 44 is provided along the X-axis direction, i.e., the direction of the axis O1. The relay flow passage 44 connects the first flow passage 41 and the second flow passage 42. For example, when the internal combustion engine 10 in which the solenoid valve 1 is mounted is a naturally aspirated engine, as shown in Fig. 3, the blow-by gas Q flows from the first flow passage 41 through the relay flow passage 44 toward the second flow passage 42.

[0029] A valve body accommodating portion 49 is disposed adjacent to the fluid passing flow channel 46 on the X-axis direction negative side. The valve body accommodating portion 49 has a cylindrical space 48 provided along the X-axis direction. The valve body 5 is accommodated in the cylindrical space 48 so as to be movable along the X-axis direction (axis O1 direction). Further, the cylindrical space 48 is connected to the relay passage 44 on the positive side in the X-axis direction, and is connected to the first passage 41 on the negative side in the Z-axis direction (radially outward). When the blow-by gas Q flows from the first passage 41 to the second passage 42, it passes through the cylindrical space 48 and the relay passage 44 in this order.

[0030] 3, the connecting member 32 is disposed on the X-axis direction negative side of the valve body accommodating portion 49. The connecting member 32 is ring-shaped and fixed to the outer circumferential side (radial outer side) of the valve body accommodating portion 49. In addition, the case body 241 of the solenoid 2 is fixed to the connecting member 32 by, for example, crimping. This brings the solenoid 2 and the flow path member 4 into a connected state.

[0031] Between the flow path member 4 and the ring member 243 of the solenoid 2, a gasket 33 is disposed in a compressed state. The gasket 33 is ring-shaped and is provided concentrically with the valve body accommodating portion 49. The gasket 33 can seal the gap between the flow path member 4 and the ring member 243, and therefore can prevent the blow-by gas Q from leaking between them, i.e., between the flow path member 4 and the solenoid 2. The gasket 33, like the gasket 204, is made of an elastic material such as urethane rubber.

[0032] Furthermore, the valve body accommodating portion 49 has an abutment portion that abuts against the valve body 5. The abutment portion may be provided on a separate member (cylindrical member 47) disposed inside the valve body accommodating portion 49. In another embodiment, as shown in Fig. 5, the abutment portion may be a convex member that protrudes radially inward from the inner surface 490 of the valve body accommodating portion 49. A configuration including a separate member (cylindrical member 47) will be described below. 4, when the contact portion is a separate member, the inner surface 490 of the valve body accommodating portion 49 forms a flat surface. That is, there are no irregularities or steps on the inner surface 490. Therefore, the separate member can come into contact with the inner surface 490 evenly along the circumferential direction.

[0033] As shown in FIG. 4, the cylindrical space 48 has a cylindrical shape and includes a cylindrical member 47 that is provided concentrically with the cylindrical space 48 . The cylindrical member 47 has an inner circumferential surface 470, and the inner circumferential surface 470 can slidably support the valve body. This allows the cylindrical member 47 to reduce the contact resistance between the valve body accommodating portion 49 and the valve body 5. This reduces the need for strict machining accuracy of the inner surface 490 of the valve body accommodating portion 49, making machining easier.

[0034] 3, the cylindrical member 47 contacts the valve body 5 on its X-axis positive side (one side in the direction of the axis O1) and contacts the ring member 243 of the solenoid 2 on its X-axis negative side (the other side in the direction of the axis O1).

[0035] As shown in FIG. 4, the cylindrical member 47 has a fitting portion 471 that fits into the inner surface 490 of the valve body accommodating portion 49. It is preferable that two or more fitting portions 471 are provided. For example, one fitting portion 471 is provided on one side of the cylindrical member 47 in the axial O1 direction, and the other fitting portion 471 is provided on the other side of the axial O1 direction via a gap portion 473. It is preferable that the fitting portion 471 is an annular flange that is continuously provided along the circumferential direction of the outer circumferential surface 472 of the cylindrical member 47. The fitting can be an interference fit, a middle fit, or a clearance fit, but an interference fit is preferable. This allows the gap between the valve body accommodating portion 49 and the cylindrical member 47 to be sealed. It is preferable that the fitting portion 471 is fitted into the gasket 33 installed in the valve body accommodating portion 49 as shown in FIG. 3. This makes it possible to press the gasket 33 radially outward, thereby enabling the gap between the flow path member 4 and the ring member 243 to be sealed with higher airtightness.

[0036] 4, an outer circumferential surface 472 from an end face perpendicular to the axial direction on one side of the axial direction of the cylindrical member 47 to the fitting portion 471 is preferably a tapered surface whose diameter increases from one side of the axial direction of the cylindrical member 47 to the other side of the axial direction of the cylindrical member 47. This improves assembly and facilitates manufacturing.

[0037] As shown in FIG. 4, the valve body accommodating portion 49 accommodates the valve body 5. The valve body 5 can move along the axis O1 together with the plunger 22. As shown in FIG. 3, the movement of the valve body 5 can open and close the relay passage 44, that is, the relay passage 44 can be switched between an open state and a closed state. In the open state, the passage of the blow-by gas Q through the fluid passage 46 is permitted. Note that FIG. 3 shows the open state. On the other hand, in the closed state, the passage of the blow-by gas Q through the fluid passage 46 is blocked.

[0038] The valve body 5 has an expanded diameter portion 51 , a valve portion 53 , and a protruding portion 55 . The valve body 5 is columnar and disposed in the valve body accommodating portion 49 (cylindrical space 48) with its central axis parallel to the axis O1. The valve body 5 is made of, for example, a resin material, similar to the bobbin 21.

[0039] 4, the enlarged diameter portion 51 protrudes radially outward and is provided on one side in the direction of the axis O1 of the valve body 5. The enlarged diameter portion 51 has, for example, a shape protruding radially outward. The expanded diameter portion 51 has an opposing surface portion 511 and a contact portion 512 . The opposing surface portion 511 is provided on the other side of the enlarged diameter portion 51 in the axial O1 direction facing the cylindrical member 47 (contact portion) in the axial O1 direction, and contacts the cylindrical member 47 (contact portion) in the open state. This makes it possible to seal the gap between the enlarged diameter portion 51 and the cylindrical member 47 (contact portion), and prevents the blow-by gas Q containing impurities from flowing into the solenoid 2 even in the open state. In other words, damage to the solenoid 2 due to the blow-by gas Q can be prevented.

[0040] The opposing surface portion 511 also has a tapered surface portion 513 that is inclined in a direction in which the outer diameter becomes smaller from one side in the direction of the axis O1 to the other side in the direction of the axis O1. In the open state, the tapered surface portion 513 comes into contact with one end of the cylindrical member 47 in the axial O1 direction. This allows the expanded diameter portion 51 to enter the cylindrical member 47, thereby sealing the cylindrical member 47 with higher airtightness. Note that the end of the cylindrical member 47 on one side in the axial O1 direction includes an end having an area, and is, for example, a surface that is visible when viewed from the front in FIG. 3.

[0041] In addition, in the open state, the opposing surface portion 511 comes into line contact with the cylindrical member 47. This makes it possible to prevent the opposing surface portion 511 and the cylindrical member 47 from bonding together due to adhesion or freezing when they are in contact with each other. Furthermore, in the open state, the opposing surface portion 511 comes into surface contact with the cylindrical member 47. As a result, when the opposing surface portion 511 and the cylindrical member 47 are in contact with each other, the gap between the opposing surface portion 511 and the cylindrical member 47 can be sealed with higher airtightness.

[0042] The contact portion 512 is provided on one side in the axial O1 direction of the expanded diameter portion 51 facing the coil spring 31 in the axial O1 direction. The contact portion 512 is a step portion 514 having a surface perpendicular to the axial O1 direction, and contacts the other side in the axial O1 direction of the coil spring 31. The contact portion 512 is preferably provided at a position larger than the inner diameter of the coil spring 31. This allows the coil spring 31 to be stably positioned.

[0043] Moreover, it is preferable that the contact portion 512 is disposed at a position where, as viewed from the axial O1 direction, at least a portion of the contact portion 512 overlaps with the opposing surface portion 511. This allows the force of the coil spring 31 to be transmitted smoothly, and the gap between the contact portion 512 and the cylindrical member 47 can be sealed with higher airtightness.

[0044] The expanded diameter portion 51 may be guided by the inner surface 490 of the valve body accommodating portion 49 when the valve body 5 moves. This allows the valve body 5 to move stably. Moreover, it is preferable that the enlarged diameter portion 51 is configured in the shape of an annular flange that is continuously provided along the circumferential direction, thereby enabling the gap between the enlarged diameter portion 51 and the cylindrical member 47 to be sealed with higher airtightness.

[0045] The valve portion 53 is provided on one side in the axis direction of the axis 01 from the enlarged diameter portion 51 of the valve body 5. The valve portion 53 can approach the relay flow passage 44 to block the relay flow passage 44 or move away from the relay flow passage 44 to open the relay flow passage 44 as the valve portion 53 moves with the plunger 22. Thus, the valve portion 53 functions as a member that opens and closes the relay flow passage 44.

[0046] The valve portion 53 is, for example, columnar or plate-shaped. The outer diameter of the valve portion 53 is smaller than the inner diameter of the coil spring 31. This prevents the valve portion 53 from coming into contact with the coil spring 31, and therefore prevents the valve portion 53 from interfering with the movement of the valve body 5.

[0047] The valve portion 53 may be disposed continuously with the enlarged diameter portion 51. This reduces the axial distance between the valve portion 53 and the enlarged diameter portion 51, thereby making it possible to miniaturize the solenoid valve. Disposed continuously means that the diameter of the valve body 5 does not decrease in the axial direction, but includes a portion in which the diameter does not change or increases.

[0048] The protruding portion 55 is provided on the other side in the axial direction of the valve body 5, spaced apart from the enlarged diameter portion 51, and protrudes radially outward. The protruding portion 55 is a constant outer diameter portion whose outer diameter is constant along the axial direction of the valve body 5. The protruding portion 55 contacts the inner peripheral surface 470 of the cylindrical member 47. As a result, when the valve body 5 moves along the axial direction of the valve body 5, the protruding portion 55 slides while being guided by the inner peripheral surface 470 of the cylindrical member 47, and therefore the valve body 5 can move stably.

[0049] Further, the valve body 5 is provided with a recess 551 on the radial inside of the protrusion 55. The recess 551 opens to the surface of the valve body 5 on the other side in the axial direction 01. This allows the portion (tip) 223 on one side in the axial direction 01 of the plunger pin 221 to enter the recess 551 and press the valve body 5 in one direction in the axial direction 01. Then, by pressing the plunger 22, the valve body 5 can be moved and the relay flow path 44 can be closed.

[0050] A coil spring 31 is disposed along the X-axis direction on the X-axis direction 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 direction 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.

[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 direction positive side in contact with the X-axis direction positive end face 491 of the valve body accommodating portion 49 and its X-axis direction negative side in contact with the expanded diameter portion 51 of the valve body 5. This allows the coil spring 31 to stably bias the valve body 5 without excess or deficiency. In addition, by using the enlarged diameter portion as a spring seat, it is possible to reduce the size of the flow path member 4. Furthermore, the contact area between the coil spring 31 and the enlarged diameter portion can be increased, thereby reducing the area where deposits can adhere. Furthermore, by making the enlarged diameter portion 51 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 enlarged diameter portion 51 of the valve body accommodating portion 49 where deposits can adhere.

[0052] The distance between the expanded diameter portion 51 and the inner 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 expanded diameter portion 51 and the inner 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 expanded diameter portion 51 and the inner 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 some of the deposits to move from the expanded diameter portion 51 to the negative side in the X-axis direction, thereby further reducing the amount of deposits remaining on the positive side in the X-axis direction from the expanded diameter portion 51. The outer diameter of the expanded diameter portion 51 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 expanded diameter portion 51 and the inner surface 490 of the valve body accommodating portion 49.

[0053] Incidentally, in the solenoid valve 1, it is preferable that the weight of the valve element 5 is as light as possible. The reason for this is that if the weight of the valve element 5 is relatively large, the movement of the valve element 5 becomes sluggish, that is, the smooth operation of the valve element 5 is hindered, and there is a risk that the relay flow passage 44 will not be switched quickly between the open state and the closed state. Therefore, the solenoid valve 1 is configured to reduce the weight of the valve element 5. The configuration and effect of the weight reduction will be described below.

[0054] 4, the valve body 5 is provided with a reduced diameter section 56 between the valve section 53 and the enlarged diameter section 51. In this way, the weight of the valve body 5 can be reduced by the amount of the reduced diameter section 56 provided in the valve body 5. This allows the valve body 5 to operate smoothly, and therefore the relay flow path 44 can be quickly switched between the open state and the closed state.

[0055] In addition, the shape of the reduced diameter portion 56 when viewed from the side, i.e., the shape when viewed from a direction perpendicular to the axis O1 direction (the Y-axis direction), is approximately rectangular in this embodiment, but is not limited to this and may be, for example, another quadrilateral shape such as a square, a semicircle, etc.

[0056] In addition to the effect of reducing weight, the reduced diameter portion 56 also has the effect of facilitating smooth operation of the spring, that is, the expansion and contraction action. As described above, the fluid passing through the fluid passage 46 is blow-by gas Q. The blow-by gas Q may contain viscous impurities. In this case, the impurities may get between the valve body 5 and the spring 31 and hinder the expansion and contraction of the spring 31. However, the impurities that get between the valve body 5 and the spring 31 flow into the reduced diameter portion as the valve body reciprocates. This allows the impurities to be collected in the reduced diameter portion 56 and remain there, promoting smooth expansion and contraction of the spring 31.

[0057] 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.

[0058] 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]

[0059] 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, 223... part (tip), 23... coil, 24... case, 241... case body, 242... connector member, 243... ring member, 244... opening, 245... wall, 25... core, 26... yoke, 262... wall, 201... connecting member, 202... bush, 203... bush, 3... valve mechanism, 31... spring, 32... connecting member, 33... gasket, 4... flow path member, 41... first flow path, 42... second flow path, 44... relay flow path, 45... gasket, 46... Fluid passage, 47... cylindrical member, 470... inner peripheral surface, 471... fitting portion, 472... outer peripheral surface, 473... gap portion, 48... cylindrical space, 49... valve body accommodating portion, 490... inner surface, 5... valve body, 51... enlarged diameter portion, 511... opposing surface portion, 512... contact portion, 513... tapered surface portion, 514... step portion, 53... valve portion, 55... protrusion portion, 551... recessed portion, 56... reduced diameter portion, 10... inner Combustion engine, 11...buffer chamber, 111...combustion chamber, 112...crank chamber, 113...buffer chamber, 114...internal flow passage, 12...piston, 13...crank, 14...external flow passage, 15...solenoid valve, 16...first auxiliary flow passage, 17...solenoid valve, 18...second auxiliary flow passage, 100...vehicle, AR...air-fuel mixture, O1...shaft, O41...central axis, O42...central axis, Q...blow-by gas

Claims

1. a solenoid including 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 core or a yoke located inside the through hole of the bobbin; a fluid passageway including a first passageway, a second passageway, and a relay passageway disposed between the first passageway and the second passageway and connecting the first passageway and the second passageway, and a valve body accommodating portion having a cylindrical space connected to the relay passageway, the flow passageway member being connected to the solenoid; a columnar valve body that is disposed in the valve body accommodating portion, moves together with the plunger along an axial direction, and is capable of switching between an open state and a closed state between the first flow path and the second flow path; the flow path member includes a contact portion that contacts the valve body in the valve body accommodating portion, and a biasing member that biases the valve body toward the other axial side, The valve body has an expanded diameter portion protruding radially outward on one axial side, The enlarged diameter portion has an opposing surface portion that faces the abutment portion at least in the axial direction, and the opposing surface portion contacts the abutment portion in the open state, The abutment portion is a cylindrical member that slidably supports the valve body on the inner surface of the valve body accommodating portion of the solenoid valve.

2. The opposing surface portion has a tapered surface portion that is inclined in a direction in which an outer diameter becomes smaller as it goes from one axial side to the other axial side, The solenoid valve according to claim 1 , wherein the tapered surface portion contacts one axial end of the cylindrical member in the open state.

3. The solenoid valve according to claim 1 , wherein the opposing surface portion is in line contact with the cylindrical member in the open state.

4. The solenoid valve according to claim 1 , wherein the opposing surface portion is in surface contact with the cylindrical member in the open state.

5. the enlarged diameter portion is a step portion having a surface perpendicular to the axial direction, and has a contact portion that comes into contact with the other axial side of the biasing member, 5. The solenoid valve according to claim 1, wherein the biasing member is arranged concentrically with the valve body on an outer circumferential side of the valve body, one axial side of the biasing member contacts an end face on one axial side of the valve body accommodating portion, and the other axial side of the biasing member contacts the enlarged diameter portion.

6. The solenoid valve according to claim 5 , wherein the opposing surface portion at least partially overlaps with the contact portion when viewed in the axial direction.

7. the valve body has a valve portion that switches between an open state and a closed state between the first flow path and the second flow path, The valve portion has an inner diameter smaller than an inner diameter of the biasing member, The solenoid valve according to any one of claims 1 to 6, wherein the expanded diameter portion and the valve portion are arranged to include a portion where the diameter of the valve body does not decrease, but rather where the diameter remains unchanged or increases.

8. The solenoid valve according to any one of claims 1 to 7, wherein the expanded diameter portion is guided by an inner surface of the valve element accommodating portion when the valve element moves.

9. The solenoid valve according to any one of claims 1 to 8, wherein the enlarged diameter portion is annular and provided continuously along a circumferential direction.

10. The solenoid valve according to any one of claims 1 to 9, wherein the cylindrical member has a fitting portion that fits into the inner surface of the valve body accommodating portion along a circumferential direction of an outer circumferential surface thereof.

11. The solenoid valve according to any one of claims 1 to 10, wherein the valve body has a protrusion that is provided on the other axial side and spaced apart from the enlarged diameter portion and protrudes radially outward, and the protrusion is guided by an inner circumferential surface of the cylindrical member when the valve body moves.

12. The solenoid valve according to any one of claims 1 to 11, wherein the valve body and the cylindrical member are made of a resin material.

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