Valve structure and supercharger

Abstract

The valve structure includes: a valve unit (200) that includes a valve element (202), a shaft portion (204) extending axially from the valve element, and a separation portion (206) provided on the shaft portion and axially separated from the valve element; a mounting plate (140) that is located between the valve element and the separation portion and includes an insertion through-hole (140a), and the shaft portion is inserted through the insertion through-hole (140a); a clamping portion that includes a first clamping surface (142a) provided on the mounting plate and a second clamping surface (206b) provided on the valve unit and axially separated from the first clamping surface; a protrusion (208) that is provided on either the valve unit or the mounting plate, and the front end of the protrusion protrudes axially beyond the first clamping surface and the second clamping surface; and an elastic member (300) that has a contact portion located between the first clamping surface and the second clamping surface and a pressed portion that is located radially inside or outside the shaft portion relative to the contact portion and contacts the protrusion.

Description

Technical Field

[0001] The present disclosure relates to a valve structure and a supercharger. This application claims the benefit of priority based on Japanese Patent Application No. 2020-148125 filed on September 3, 2020, the content of which is incorporated herein by reference. Background Art

[0002] Currently, a valve structure as shown in Patent Document 1 is known. This valve structure includes a valve unit including a valve element and a washer, a mounting plate, and an elastic member formed of a disc spring. The valve unit includes a shaft portion connecting the valve element and the washer, and the shaft portion is inserted through the mounting plate. A gap is ensured between the valve element, the mounting plate, and the washer, and the mounting plate is provided so as to be movable along the shaft portion. The elastic member is disposed between the washer and the mounting plate, and biases the mounting plate toward the valve element side.

[0003] The valve structure shown in Patent Document 1 is provided as an exhaust gas bypass valve for a vehicle supercharger. The exhaust gas bypass valve opens and closes a bypass flow path provided in a turbine. In the case of closing the bypass flow path, an actuator connected to the mounting plate is driven. Using the power of the actuator, the mounting plate presses the valve element of the exhaust gas bypass valve against a valve contact surface. A conical surface is formed on the surface of the valve element on the mounting plate side, allowing the inclination of the valve element.

[0004] In the case of opening the bypass flow path, the valve element separates from the valve contact surface. At this time, the exhaust pulsation of the exhaust gas discharged from the bypass flow path is transmitted to the valve element. If the valve element vibrates due to the exhaust pulsation, there is a concern about noise generated by the contact between the valve unit and the mounting plate. The noise generation is suppressed by pressing the mounting plate against the valve element by the acting force of the elastic member.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: WO2014 / 011468A1 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] Since the elastic member is usually formed by stamping, dimensional deviations occur. The dimensional deviations of the elastic member cause deviations in the acting force applied to the mounting plate. If the acting force is strong, when the valve element is pressed against the valve contact surface, it is difficult for the valve element to incline, and the sealing performance is reduced. On the other hand, if the acting force is weak, there is a higher concern about noise generation when the bypass flow path is opened. Therefore, a technique for reducing the deviation of the acting force of the elastic member is required.

[0010] An object of the present invention is to provide a valve structure and a supercharger capable of reducing the deviation of the acting force of the elastic member.

[0011] Means for Solving the Problems

[0012] In order to solve the above problems, the valve structure of the present disclosure includes: a valve unit including a valve element, a shaft portion extending axially from the valve element, and a separation portion provided on the shaft portion and axially separated from the valve element; a mounting plate located between the valve element and the separation portion and including an insertion through-hole, and the shaft portion is inserted through the insertion through-hole; a clamping portion including a first clamping surface provided on the mounting plate and a second clamping surface provided on the valve unit and axially separated from the first clamping surface; a protruding portion provided on either the valve unit or the mounting plate, and the front end of the protruding portion protrudes axially beyond the first clamping surface and the second clamping surface; and an elastic member having a contact portion located between the first clamping surface and the second clamping surface and a pressed portion located radially inside or outside the shaft portion relative to the contact portion and in contact with the protruding portion.

[0013] The valve structure may also include an opposing portion provided on the other of the valve unit and the mounting plate and axially opposing the protruding portion.

[0014] In order to solve the above problems, the supercharger of the present disclosure includes the above valve structure.

[0015] The effects of the invention are as follows.

[0016] According to the present disclosure, it is possible to reduce the deviation of the acting force of the elastic member. Description of the Drawings

[0017] Figure 1 is a schematic cross-sectional view of the supercharger.

[0018] Figure 2 is an external view of the turbine housing.

[0019] Figure 3 is Figure 2 the III-direction view of

[0020] Figure 4 is an explanatory view for explaining the connection structure between the valve unit and the mounting plate.

[0021] Figure 5 is Figure 3 the internal view of the turbine housing after the valve unit shown in

[0022] Figure 6 is a schematic cross-sectional view of the valve unit, the mounting plate, and the elastic member of the present embodiment.

[0023] Figure 7 is Figure 6 the enlarged view of the single-dot dash line portion of

[0024] Figure 8 is a view for explaining the valve unit, the mounting plate, and the elastic member before assembly.

[0025] Figure 9 This is a diagram illustrating the assembly process of the valve unit, mounting plate, and elastic member.

[0026] Figure 10 This is a schematic cross-sectional view of the valve unit, mounting plate, and elastic member of the first modification example.

[0027] Figure 11A This is a schematic cross-sectional view of the valve unit, mounting plate, and elastic member of the second modification example. Figure 11B This is a schematic cross-sectional view of the valve unit, mounting plate, and elastic member of the third modification example.

[0028] Figure 12 This is a schematic cross-sectional view of the valve unit, mounting plate, and elastic member of the fourth modification example.

[0029] Figure 13 This is a schematic cross-sectional view of the valve unit, mounting plate, and elastic member of the fifth modification example. Detailed implementation mode

[0030] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. The dimensions, materials, specific numerical values, etc. shown in the embodiment are merely examples for easy understanding, and do not limit the present disclosure unless otherwise specified. In addition, in this specification and the accompanying drawings, elements having substantially the same function and structure are denoted by the same reference numerals, redundant descriptions are omitted, and illustrations of elements not directly related to the present disclosure are omitted.

[0031] Figure 1 This is a schematic cross-sectional view of the supercharger TC. Hereinafter, Figure 1 the direction of the arrow L shown will be described as the left side of the supercharger TC. The direction of the arrow R shown Figure 1 will be described as the right side of the supercharger TC. As shown in Figure 1 , the supercharger TC is configured to include a supercharger main body 1. The supercharger main body 1 includes a bearing housing 3, a turbine housing 5, and a compressor housing 7. The turbine housing 5 is connected to the left side of the bearing housing 3 by a fastening mechanism 9. The compressor housing 7 is connected to the right side of the bearing housing 3 by fastening bolts 11.

[0032] On the outer peripheral surface of the bearing housing 3, a protrusion 3a is provided. The protrusion 3a is provided near the turbine housing 5. The protrusion 3a protrudes in the radial direction of the bearing housing 3. On the outer peripheral surface of the turbine housing 5, a protrusion 5a is provided. The protrusion 5a is provided near the bearing housing 3. The protrusion 5a protrudes in the radial direction of the turbine housing 5. The bearing housing 3 and the turbine housing 5 are fastened by the fastening mechanism 9. The fastening mechanism 9 is constituted by, for example, a G-coupler. The fastening mechanism 9 clamps the protrusions 3a, 5a.

[0033] A bearing hole 3b is formed in the bearing housing 3. The bearing hole 3b penetrates the bearing housing 3 in the left-right direction of the supercharger TC. A bearing is disposed in the bearing hole 3b. A shaft 13 is inserted through the bearing. The bearing rotatably supports the shaft 13. In the present embodiment, the bearing is a sliding bearing. However, it is not limited thereto, and the bearing may also be a rolling bearing. A turbine impeller 15 is provided at the left end portion of the shaft 13. The turbine impeller 15 is rotatably received in the turbine housing 5. A compressor impeller 17 is provided at the right end portion of the shaft 13. The compressor impeller 17 is rotatably received in the compressor housing 7.

[0034] An air inlet 19 is formed in the compressor housing 7. The air inlet 19 opens on the right side of the supercharger TC. The air inlet 19 is connected to an air cleaner (not shown). A diffuser flow path 21 is formed by the surfaces of the bearing housing 3 and the compressor housing 7. The diffuser flow path 21 pressurizes air. The diffuser flow path 21 is formed in a ring shape. The diffuser flow path 21 communicates with the air inlet 19 via the compressor impeller 17 on the radially inner side.

[0035] A compressor scroll flow path 23 is formed in the compressor housing 7. The compressor scroll flow path 23 is formed in a ring shape. The compressor scroll flow path 23 is, for example, located on the radially outer side of the shaft 13 as compared with the diffuser flow path 21. The compressor scroll flow path 23 communicates with an air inlet of an engine (not shown) and the diffuser flow path 21. When the compressor impeller 17 rotates, air is sucked into the compressor housing 7 from the air inlet 19. The sucked air is pressurized and accelerated as it flows between the blades of the compressor impeller 17. The pressurized and accelerated air is pressurized in the diffuser flow path 21 and the compressor scroll flow path 23. The pressurized air is guided to the air inlet of the engine.

[0036] An exhaust port 25 is formed in the turbine housing 5. The exhaust port 25 opens on the left side of the supercharger TC. The exhaust port 25 is connected to an exhaust gas purification device (not shown). An internal space 27 is formed inside the turbine housing 5. The internal space 27 opens at the exhaust port 25. The internal space 27 is formed on the downstream side (near the exhaust port 25) as compared with the turbine impeller 15.

[0037] A communication path 29 and a turbine scroll flow path 31 are formed in the turbine housing 5. The turbine scroll flow path 31 is formed in a ring shape. The turbine scroll flow path 31 is, for example, located on the radially outer side of the shaft 13 as compared with the communication path 29. The turbine scroll flow path 31 communicates with a gas inlet 33 (see Figure 2 ). Exhaust gas discharged from an exhaust manifold of an engine (not shown) is guided to the gas inlet 33. The communication path 29 connects the turbine scroll flow path 31 and the exhaust port 25 (internal space 27) via the turbine impeller 15. The exhaust gas guided to the turbine scroll flow path 31 from the gas inlet 33 is guided to the exhaust port 25 via the communication path 29, the turbine impeller 15, and the internal space 27. The exhaust gas guided to the exhaust port 25 rotates the turbine impeller 15 during the flow-through process.

[0038] The rotational force of the turbine impeller 15 is transmitted via the shaft 13 to the compressor impeller 17. If the compressor impeller 17 rotates, the air is pressurized as described above. Thus, the air is guided to the intake port of the engine.

[0039] Figure 2 is an external view of the turbine housing 5. As Figure 2 shown, a valve device 100 is provided in the turbine housing 5. The valve device 100 includes an actuator 110 and a link mechanism 120. The link mechanism 120 includes a rod 122, a connecting pin 124, a link plate 126, and a rotating shaft 128. As Figure 2 shown, the actuator 110, the rod 122, the connecting pin 124, and the link plate 126 are arranged outside the turbine housing 5.

[0040] The actuator 110 is connected to the rod 122. The actuator 110 moves the rod 122 in the central axis direction of the rod 122 ( Figure 2 the directions of arrow a and arrow b in). One end of the rod 122 is connected to the actuator 110, and the other end is connected to the connecting pin 124. The connecting pin 124 connects the rod 122 and the link plate 126. In the present embodiment, the connecting pin 124 is fixed to the rod 122. The connecting pin 124 rotatably supports the link plate 126.

[0041] A pin hole 126a and a shaft hole 126b are formed in the link plate 126. The connecting pin 124 is inserted through the pin hole 126a. The rotating shaft 128 is inserted through the shaft hole 126b. The rotating shaft 128 is fixed to the link plate 126. The rotating shaft 128 rotates integrally with the link plate 126.

[0042] If the actuator 110 is driven, the rod 122 moves in Figure 2 the direction of arrow a or arrow b in. If the rod 122 moves in Figure 2 the direction of arrow a in, the link plate 126 rotates in Figure 2 the direction of arrow c around the rotating shaft 128. If the rod 122 moves in Figure 2 the direction of arrow b in, the link plate 126 rotates in Figure 2 the direction of arrow d around the rotating shaft 128.

[0043] Figure 3 is Figure 2 a view from the III direction. Figure 3 is an internal view of the turbine housing 5. As Figure 3 shown, the valve device 100 further includes a bearing member 130, a mounting plate 140, and a valve unit 200. The bearing member 130, the mounting plate 140, and the valve unit 200 are arranged in the internal space 27 of the turbine housing 5.

[0044] A through hole 5b is formed in the turbine housing 5. A bearing member 130 is inserted through the through hole 5b. The bearing member 130 has a cylindrical shape. A rotating shaft 128 is inserted through the bearing member 130. The bearing member 130 rotatably supports the rotating shaft 128.

[0045] One end of the rotating shaft 128 is disposed outside the turbine housing 5, and the other end is disposed inside the turbine housing 5. One end of the rotating shaft 128 is connected to the link plate 126, and the other end is connected to the mounting plate 140. The mounting plate 140 is integrally mounted on the rotating shaft 128. For example, the mounting plate 140 is welded to the rotating shaft 128 and rotates integrally with the rotating shaft 128. In the present embodiment, the mounting plate 140 and the rotating shaft 128 are formed separately. However, it is not limited thereto, and the mounting plate 140 may also be formed integrally with the rotating shaft 128. The valve unit 200 is mounted at a position on the mounting plate 140 opposite to the portion connected to the rotating shaft 128.

[0046] Figure 4 is an explanatory diagram for explaining the connection structure between the valve unit 200 and the mounting plate 140. As Figure 4 shown, the valve unit 200 includes a valve element 202, a shaft portion 204, and a separating portion 206. The valve element 202 has a truncated cone shape, and an abutting surface 202a is provided on the large-diameter side. A shaft portion 204 is provided on the small-diameter side of the valve element 202, that is, on the side opposite to the abutting surface 202a. The shaft portion 204 is formed integrally with the valve element 202 and extends axially from the valve element 202.

[0047] The separating portion 206 is mounted on the shaft portion 204. Here, the separating portion 206 is formed of a metal plate of a component separate from the valve element 202 and the shaft portion 204. The separating portion 206 has a disk shape with a hole 206a in the center and is axially separated from the valve element 202. The shaft portion 204 is inserted through the hole 206a of the separating portion 206.

[0048] The mounting plate 140 is located between the valve element 202 and the separating portion 206. An insertion hole 140a is formed in the mounting plate 140. The shaft portion 204 is inserted through the insertion hole 140a. The separating portion 206 is mounted on the shaft portion 204 by riveting the front end of the shaft portion 204, which will be described in detail below. However, the separating portion 206 may also be mounted on the shaft portion 204 by welding, bonding, etc.

[0049] As Figure 1As shown, a bypass flow path 35 and a wastegate port 37 are formed in the turbine housing 5. One end of the bypass flow path 35 is connected to the turbine scroll flow path 31, and the other end is connected to the internal space 27 via the wastegate port 37. The bypass flow path 35 connects the turbine scroll flow path 31 and the internal space 27. The bypass flow path 35 and the wastegate port 37 are located radially outside the turbine impeller 15. The wastegate port 37 is formed on the downstream side (the discharge port 25 side) with respect to the turbine impeller 15. The bypass flow path 35 bypasses a part of the exhaust gas flowing through the turbine scroll flow path 31 around the turbine impeller 15 and guides it to the internal space 27.

[0050] The wastegate port 37 is formed on a contact surface 39 of the inner wall of the turbine housing 5 that forms the internal space 27 and against which the valve element 202 can abut. The outer diameter of the abutting surface 202a of the valve element 202 is larger than the inner diameter of the wastegate port 37. In the present embodiment, the valve unit 200 functions as a wastegate valve. The valve element 202 closes the wastegate port 37 in a state of abutting against the contact surface 39. If the wastegate port 37 is closed, the exhaust gas flowing through the turbine scroll flow path 31 does not flow out to the internal space 27 via the bypass flow path 35.

[0051] The valve element 202 opens the wastegate port 37 in a state of being separated from the contact surface 39. If the wastegate port 37 is opened, a part of the exhaust gas flowing through the turbine scroll flow path 31 flows out to the internal space 27 via the bypass flow path 35 and the wastegate port 37.

[0052] Returning to Figure 3 , if the rotary shaft 128 rotates in the direction of arrow c in Figure 2 due to the drive of the actuator 110 (refer to Figure 3 ), the mounting plate 140 rotates in the direction of arrow c in Figure 3 integrally with the rotary shaft 128. If the mounting plate 140 rotates in the direction of arrow c in Figure 3 , the valve unit 200 held by the mounting plate 140 rotates in the direction of arrow c about the rotary shaft 128 as the center of rotation in Figure 3 .

[0053] Figure 5 is Figure 3 An internal view of the turbine housing 5 after the valve unit 200 shown in Figure 5 rotates in the direction of arrow c. As Figure 5 shows, if the valve unit 200 rotates in the direction of arrow c, the valve element 202 moves in a direction of being separated from the contact surface 39. If the valve element 202 is separated from the contact surface 39, the wastegate port 37 is opened.

[0054] On the other hand, if the mounting plate 140 rotates in the direction of arrow c in Figure 2 due to the drive of the actuator 110 (refer to Figure 5When rotating in the direction of arrow d, the valve element 202 rotates around the rotation axis 128 in Figure 5 the direction of arrow d. When the valve element 202 rotates in the direction of arrow d, as Figure 3 shown, the valve element 202 moves in the direction approaching the contact surface 39. When the valve element 202 abuts against the contact surface 39, the wastegate port 37 closes.

[0055] As Figure 4 shown, a gap is formed between the mounting plate 140 and the separation part 206. An elastic member 300 is provided in this gap. That is, the elastic member 300 is provided between the mounting plate 140 and the separation part 206. The elastic member 300 is composed of a disk-shaped flat plate member including a through hole 300a at the center, and applies a force to the mounting plate 140 toward the valve element 202, which will be described in detail below. In other words, the elastic member 300 acts with a force in the direction in which the mounting plate 140 and the separation part 206 are separated.

[0056] The mounting plate 140 can move slightly in the axial direction of the shaft portion 204 between the valve element 202 and the separation part 206. And, the inner diameter of the insertion through hole 140a is larger than the diameter of the shaft portion 204. Therefore, the valve unit 200 can be tilted slightly relative to the mounting plate 140. When the valve element 202 abuts against the contact surface 39, the valve element 202 tilts, so that the valve element 202 does not come into end contact with the contact surface 39, ensuring the sealing performance.

[0057] On the other hand, when the valve element 202 separates from the contact surface 39 and the wastegate port 37 is open, the exhaust gas discharges from the wastegate port 37 to the internal space 27. At this time, the exhaust pulsation of the exhaust gas discharged from the bypass flow path 35 is transmitted to the valve element 202. If the valve element 202 vibrates due to the exhaust pulsation, there is a concern of generating noise due to the contact between the valve element 202 and the mounting plate 140. According to the present disclosure, the mounting plate 140 is pressed against the valve element 202 by the force of the elastic member 300, so the generation of noise is suppressed.

[0058] In the existing wastegate valve, a stamping-formed disc spring is used instead of the elastic member 300 of the present disclosure. The stamping-formed disc spring is likely to have dimensional deviations. The dimensional deviations of the disc spring cause deviations in the force acting on the mounting plate 140. If the force is strong, when the valve element 202 is pressed against the contact surface 39, it is difficult for the valve element 202 to tilt, and the sealing performance is reduced. On the other hand, if the force is weak, after the wastegate port 37 is opened, the concern of generating noise becomes high. According to the present disclosure, according to the valve structure of the valve device 100 described below, the deviation of the force of the elastic member 300 can be reduced.

[0059] Figure 6It is a schematic cross-sectional view of the valve unit 200, the mounting plate 140, and the elastic member 300 of the present embodiment. On the side of the valve element 202 opposite to the abutting surface 202a, there is a raised portion 202b. The cross-sectional shape of the raised portion 202b orthogonal to the axial direction of the shaft portion 204 is circular and extends along the axial direction of the shaft portion 204 (hereinafter, simply referred to as the axial direction). Here, the axial length of the raised portion 202b is smaller than the axial thickness from the abutting surface 202a to the raised portion 202b.

[0060] The raised portion 202b is located on the side opposite to the abutting surface 202a, that is, near the shaft portion 204. At the front end of the raised portion 202b, there is a tapered surface 202c that intersects the axial direction. Here, the tapered surface 202c is inclined such that the radially inner portion protrudes in the axial direction. The outer diameter of the tapered surface 202c is smaller than the outer diameter of the abutting surface 202a.

[0061] The shaft portion 204 includes a large-diameter portion 204a and a small-diameter portion 204b. The large-diameter portion 204a extends in the axial direction from the center of the tapered surface 202c. The diameter of the large-diameter portion 204a is smaller than the diameter of the tapered surface 202c. The small-diameter portion 204b is provided on the front-end side of the large-diameter portion 204a. In other words, the small-diameter portion 204b is located on the side opposite to the valve element 202 with respect to the large-diameter portion 204a. The diameter of the small-diameter portion 204b is smaller than the diameter of the large-diameter portion 204a. The small-diameter portion 204b is continuous with the large-diameter portion 204a, and a stepped surface 204c is formed at the connecting portion between the large-diameter portion 204a and the small-diameter portion 204b. The stepped surface 204c is an annular plane that intersects the axial direction. Here, the stepped surface 204c is orthogonal to the axial direction.

[0062] The mounting plate 140 includes a main body portion 140b that includes an insertion through-hole 140a. The main body portion 140b has a first surface (in the present disclosure, it may also be referred to as the valve element side opposing surface) 140c on the side of the valve element 202. The first surface 140c is composed of a flat surface and opposes the tapered surface 202c. And, the main body portion 140b has a second surface (in the present disclosure, it may also be referred to as the separation portion side opposing surface) 140d on the side of the separation portion 206. The second surface 140d is composed of a flat surface and opposes the separation portion 206.

[0063] On the second surface 140d of the main body portion 140b, there is an annular protrusion 142. The annular protrusion 142 protrudes from the second surface 140d toward the separation portion 206. The annular protrusion 142 is provided on the periphery of the insertion through-hole 140a. At the front end in the protruding direction of the annular protrusion 142, there is a first clamping surface 142a. The first clamping surface 142a is composed of an annular flat surface. The insertion through-hole 140a penetrates from the first surface 140c to the first clamping surface 142a.

[0064] The large-diameter portion 204a of the shaft portion 204 is inserted into the insertion through-hole 140a. The inner diameter of the insertion through-hole 140a is larger than the diameter of the large-diameter portion 204a. Also, the length from the first surface 140c to the first clamping surface 142a, that is, the axial length of the insertion through-hole 140a, is smaller than the axial length of the large-diameter portion 204a. Therefore, the end portion near the small-diameter portion 204b and the stepped surface 204c in the large-diameter portion 204a are located outside the insertion through-hole 140a.

[0065] The separation portion 206 has a second clamping surface 206b located near the mounting plate 140. The second clamping surface 206b is formed of a flat surface and is axially separated and opposed to the first clamping surface 142a of the mounting plate 140. Also, as described above, a hole 206a is formed at the center of the separation portion 206. The small-diameter portion 204b of the shaft portion 204 is inserted into the hole 206a.

[0066] The outer diameter of the separation portion 206 is larger than the outer diameter of the annular protrusion 142. The axial length of the small-diameter portion 204b is larger than the axial length of the hole 206a. Therefore, the front end of the small-diameter portion 204b protrudes from the hole 206a. In a state where the second clamping surface 206b abuts against the stepped surface 204c of the shaft portion 204, the front end of the small-diameter portion 204b protruding from the hole 206a is riveted. Thereby, the relative movement between the separation portion 206 and the shaft portion 204 is restricted.

[0067] A protruding portion 208 is provided on the separation portion 206. The protruding portion 208 is provided on the radially outer side with respect to the second clamping surface 206b and protrudes axially toward the mounting plate 140. The protruding portion 208 is provided on the outer peripheral edge of the separation portion 206. Also, the front end of the protruding portion 208 protrudes axially beyond the first clamping surface 142a of the annular protrusion 142 and the second clamping surface 206b of the separation portion 206.

[0068] However, the front end of the protruding portion 208 is axially separated from the second surface 140d of the mounting plate 140. The separation portion 206 and the mounting plate 140 do not contact each other axially, and a gap is formed therebetween.

[0069] The elastic member 300 is provided in the gap formed between the separation portion 206 and the mounting plate 140. As described above, the elastic member 300 is composed of a disk-shaped flat plate member and maintains a planar shape in a state where no external force is applied. In a state where the valve unit 200 is assembled to the mounting plate 140, an external force acts on the elastic member 300 within the range of elastic deformation of the elastic member 300. That is, a restoring force that always acts on the elastic member 300 to restore it to a planar shape acts. This restoring force becomes an acting force that acts on the mounting plate 140 toward the valve element 202. In addition, a plurality of slits extending from the outer peripheral edge toward the radially inner side may be provided in the elastic member 300. By providing the slits, the deformation during elastic deformation can be reduced.

[0070] Figure 7 is Figure 6 an enlarged view of the single-dot chain line portion of. As Figure 7 shown here, the axial protruding height of the protrusion 208 is shown as L1. Similarly, the axial protruding height of the annular protrusion 142 is shown as L2. And Figure 7 L3 shown in is the maximum axial separation amount between the mounting plate 140 and the separation portion 206. This maximum clearance amount can also be said to be the maximum separation amount between the mounting plate 140 and the valve element 202. And Figure 7 in, the thickness of the elastic member 300, that is, the plate thickness, is shown as L4. Therefore, the axial play of the mounting plate 140, that is, the maximum clearance amount between the valve unit 200 and the mounting plate 140 is L3 - L4. That is to say, the mounting plate 140 can only move axially relative to the valve unit 200 by L3 - L4.

[0071] And, in the present embodiment, the protruding height L2 of the annular protrusion 142 is larger than the protruding height L1 of the protrusion 208. The protruding height L1 of the protrusion 208 is larger than the maximum clearance amount L3 between the mounting plate 140 and the separation portion 206. That is, here, the dimensional relationship of L2 > L1 > L3 is maintained. The front end of the protrusion 208 protrudes toward the mounting plate 140 with this dimensional relationship.

[0072] The clamping portion 220 is composed of the first clamping surface 142a and the second clamping surface 206b. That is, the clamping portion 220 includes the first clamping surface 142a provided on the mounting plate 140 and the second clamping surface 206b provided on the valve unit 200 and axially separated from the first clamping surface 142a. The clamping portion 220 is provided in a range where the first clamping surface 142a and the second clamping surface 206b are substantially opposed to clamp the elastic member 300.

[0073] The elastic member 300 has a contact portion 302 located between the first clamping surface 142a and the second clamping surface 206b. That is to say, the contact portion 302 is the portion of the elastic member 300 located between the first clamping surface 142a and the second clamping surface 206b. A first contact point 302a in contact with the first clamping surface 142a and a second contact point 302b in contact with the second clamping surface 206b are provided on the contact portion 302.

[0074] The first contact point 302a contacts the front end of the annular protrusion 142, that is, the outer peripheral edge of the first clamping surface 142a. The second contact point 302b is provided at the inner peripheral end of the surface of the elastic member 300 opposed to the separation portion 206. Therefore, the second contact point 302b is located on the inner diameter side of the elastic member 300 compared with the first contact point 302a.

[0075] Further, the elastic member 300 has a pressed portion 304. The pressed portion 304 is located radially outside the contact portion 302 and contacts the protruding portion 208. The pressed portion 304 is provided on the outer peripheral side of the surface of the elastic member 300 that faces the separating portion 206 and contacts the inner peripheral edge of the front end of the protruding portion 208.

[0076] The pressed portion 304 is located radially outside the first contact point 302a. The first contact point 302a is located radially outside the second contact point 302b. Further, the pressed portion 304 is located near the mounting plate 140 compared to the first contact point 302a. The first contact point 302a is located near the mounting plate 140 compared to the second contact point 302b.

[0077] Figure 8 FIG. is a view showing the valve unit 200, the mounting plate 140, and the elastic member 300 before assembly. Figure 9 FIG. is a view showing the assembly process of the valve unit 200, the mounting plate 140, and the elastic member 300. As Figure 8 shown, when assembling the valve unit 200, the mounting plate 140, and the elastic member 300, the shaft portion 204 is sequentially inserted through the mounting plate 140, the elastic member 300, and the separating portion 206.

[0078] Specifically, as shown in the upper part of Figure 9 , first, the large-diameter portion 204a is inserted through the insertion hole 140a of the mounting plate 140. At this time, the first surface 140c of the mounting plate 140 contacts the tapered surface 202c. In this state, the stepped surface 204c of the shaft portion 204 protrudes from the first clamping surface 142a of the mounting plate 140.

[0079] Next, the large-diameter portion 204a is inserted through the through hole 300a of the elastic member 300. The inner diameter of the through hole 300a is larger than the diameter of the large-diameter portion 204a. In a state where the large-diameter portion 204a is inserted through the through hole 300a, the elastic member 300 contacts the first clamping surface 142a. Further, the plate thickness of the elastic member 300 (refer to L4 in Figure 7 ) is smaller than the maximum axial separation amount between the mounting plate 140 and the separating portion 206 (refer to L3 in Figure 7 ). Therefore, in this state, the stepped surface 204c of the shaft portion 204 protrudes from the through hole 300a of the elastic member 300.

[0080] Next, the small-diameter portion 204b is inserted through the hole 206a of the separating portion 206. At this time, the protruding portion 208 of the separating portion 206 contacts the elastic member 300. Then, starting from the state shown in the upper part of Figure 9 , as shown in Figure 9As shown in the middle section of FIG. 1 , the separation portion 206 is pressed in the axial direction toward the mounting plate 140. Since the outer diameter of the step surface 204c is larger than the inner diameter of the hole 206a, the separation portion 206 is stationary when the second clamping surface 206b contacts the step surface 204c.

[0081] In the process of pressing the separation portion 206 toward the mounting plate 140 in the axial direction, the protrusion 208 presses the pressed portion 304 of the elastic member 300 toward the mounting plate 140. At this time, the contact portion 302 of the elastic member 300 is clamped between the first clamping surface 142a and the second clamping surface 206b. Figure 9 The state shown in the upper section to the state shown in the middle section overcomes the elastic force of the elastic member 300 and is pressed in the axial direction. Figure 9 In the state shown in the middle section of FIG. 1 , a force in a direction away from the mounting plate 140 is applied to the protrusion 208 of the separation portion 206 . Also, a force in a direction from the separation portion 206 toward the valve element 202 is applied to the annular protrusion 142 of the mounting plate 140 .

[0082] And, keep the above state unchanged, such as Figure 9 As shown in the lower section of FIG. 2 , the front end of the small diameter portion 204b is riveted. As a result, a force pressing the protrusion 208 toward the mounting plate 140 is always applied to the pressed portion 304 of the elastic member 300. Furthermore, a force pressing the annular protrusion 142 toward the separation portion 206 is always applied to the first contact point 302a of the elastic member 300. Furthermore, a force pressing the second clamping surface 206b toward the mounting plate 140 is always applied to the second contact point 302b of the elastic member 300. In this way, the restoring force of the elastic member 300 acts as a force acting on the mounting plate 140 toward the valve core 202.

[0083] According to the above structure, the protrusion height of the protrusion 208 (see Figure 7 L1), the protruding height of the annular protrusion 142 (refer to Figure 7 The dimensional management of the axial length of the large diameter portion 204a and the axial length of the large diameter portion 204a can suppress the deviation of the force of the elastic member 300. As in the prior art, the dimensional management of the valve unit 200 and the mounting plate 140 is easier than the dimensional management of the disc spring formed by stamping. Therefore, according to the present disclosure, the deviation of the force of the elastic member 300 can be easily suppressed compared with the prior art.

[0084] Figure 10It is a schematic cross-sectional view of the valve unit 400, the mounting plate 150, and the elastic member 300 of the first modified example. In the first modified example, the mounting plate 150 is provided instead of the mounting plate 140 of the above-described embodiment. In the first modified example, only the structure of the mounting plate 150 is different from that of the above-described embodiment, and all other structures are the same as those of the above-described embodiment. Therefore, here, the structure different from that of the above-described embodiment will be described, and the same reference numerals are given to the structures that are the same as those of the above-described embodiment, and their detailed descriptions are omitted.

[0085] As Figure 10 shown, the mounting plate 150 includes a main body portion 150b having an insertion through-hole 150a. A first surface 150c opposed to the tapered surface 202c is provided on the main body portion 150b. Further, an annular protrusion 152 protruding toward the separation portion 206 is provided on the main body portion 150b. A first clamping surface 152a is formed at the front end of the annular protrusion 152 in the protruding direction. Here, the outer diameter of the annular protrusion 152 is smaller than the outer diameter of the separation portion 206.

[0086] Moreover, in the above-described embodiment, the second surface 140d of the main body portion 140b is axially opposed to the protruding portion 208. On the other hand, in the first modified example, only a part of the main body portion 150b of the mounting plate 150 is axially opposed to the protruding portion 208.

[0087] In the first modified example, the clamping portion 220 is also constituted by the first clamping surface 152a of the mounting plate 150 and the second clamping surface 206b of the separation portion 206. The contact portion 302 of the elastic member 300 is located at the clamping portion 220. Further, a first contact point 302a that contacts the first clamping surface 152a and a second contact point 302b that contacts the second clamping surface 206b are provided at the contact portion 302.

[0088] Furthermore, a protruding portion 208 is provided on the separation portion 206. The protruding portion 208 is located radially outside the clamping portion 220. The front end of the protruding portion 208 protrudes toward the mounting plate 150 beyond the first clamping surface 152a. The pressed portion 304 of the elastic member 300 contacts the protruding portion 208. Thus, according to the first modified example, as in the above-described embodiment, the clamping portion 220 and the contact portion 302 are provided radially inside the protruding portion 208 and the pressed portion 304. Moreover, the elastic member 300 is pressed toward the mounting plate 150 by the protruding portion 208 provided on the separation portion 206. Therefore, according to the first modified example, the same operational effects as those of the above-described embodiment can also be achieved.

[0089] Figure 11AIt is a schematic cross-sectional view of the valve unit 500, mounting plate 160, and elastic member 300 of the second modified example. In the second modified example, the mounting plate 160 is provided instead of the mounting plate 140 of the above-described embodiment, and the separation portion 506 is provided instead of the separation portion 206 of the above-described embodiment. In the second modified example, only the structures of the mounting plate 160 and the separation portion 506 are different from those of the above-described embodiment, and all other structures are the same as those of the above-described embodiment. Therefore, here, the structures different from those of the above-described embodiment will be described, and the same reference numerals will be given to the structures the same as those of the above-described embodiment, and their detailed descriptions will be omitted.

[0090] As Figure 11A shown, the mounting plate 160 includes a main body portion 160b including an insertion through-hole 160a. A first surface 160c opposed to the conical surface 202c is provided on the main body portion 160b. And, a first clamping surface 160d is provided on the side of the main body portion 160b opposite to the first surface 160c. The first clamping surface 160d is opposed to the separation portion 506. A protruding portion 162 protruding toward the separation portion 506 is provided on the radially outer side of the first clamping surface 160d.

[0091] The protruding portion 162 extends annularly at a position radially outside the first clamping surface 160d. The protruding portion 162 is provided separately from the insertion through-hole 160a in the radial direction. In a state where the first surface 160c is in contact with the conical surface 202c, the stepped surface 204c of the shaft portion 204 protrudes from the insertion through-hole 160a. At this time, the front end of the protruding portion 162 protrudes more toward the separation portion 506 than the stepped surface 204c.

[0092] The separation portion 506 is formed of a metal plate of a component separated from the valve element 202 and the shaft portion 204. The separation portion 506 has a disk shape including a hole 506a at the center and is separated from the valve element 202 in the axial direction. The small-diameter portion 204b of the shaft portion 204 is inserted through the hole 506a of the separation portion 506.

[0093] The separation portion 506 includes a surface (which may also be referred to as the mounting plate side opposed surface in the present disclosure) 506b opposed to the mounting plate 160. Here, the outer diameter of the surface 506b is substantially equal to the outer diameter of the protruding portion 162. An annular protrusion 508 is provided on the surface 506b. The annular protrusion 508 protrudes from the surface 506b toward the mounting plate 160. The annular protrusion 508 is provided at the periphery of the hole 506a. A second clamping surface 508a is provided at the front end in the protruding direction of the annular protrusion 508. The second clamping surface 508a is formed of an annular flat surface.

[0094] The separation part 506 is installed on the valve core 202 and the shaft part 204 by riveting the front end of the small-diameter part 204b. In this state, the second clamping surface 508a contacts the step surface 204c. The outer diameter of the annular protrusion 508 is larger than the outer diameter of the step surface 204c and smaller than the inner diameter of the protruding part 162. Therefore, the part of the second clamping surface 508a that is radially outside the part facing the step surface 204c is axially opposed to the first clamping surface 160d.

[0095] The second clamping surface 508a and the first clamping surface 160d are axially separated. According to the amount of the gap between the second clamping surface 508a and the first clamping surface 160d, the maximum axial separation amount between the mounting plate 160 and the separation part 506 is set. Moreover, the clamping part 220 is constituted by the second clamping surface 508a and the first clamping surface 160d.

[0096] Furthermore, the protruding part 162 provided on the mounting plate 160 is radially separated from the second clamping surface 508a and the clamping part 220. Moreover, the front end of the protruding part 162 protrudes toward the separation part 506 beyond the second clamping surface 508a of the annular protrusion 508. That is to say, the axial height of the protruding part 162 is larger than the maximum separation amount between the second clamping surface 508a and the first clamping surface 160d.

[0097] The elastic member 300 has a contact part 302 located between the second clamping surface 508a and the first clamping surface 160d. That is to say, the contact part 302 is the part of the elastic member 300 located between the second clamping surface 508a and the first clamping surface 160d. A first contact point 302a that contacts the first clamping surface 160d and a second contact point 302b that contacts the second clamping surface 508a are provided on the contact part 302.

[0098] The first contact point 302a is provided at the inner peripheral end of the surface of the elastic member 300 that faces the mounting plate 160. The second contact point 302b contacts the front end of the annular protrusion 508, that is, the outer peripheral edge of the second clamping surface 508a. Therefore, the first contact point 302a is located radially inside the second contact point 302b.

[0099] Moreover, the elastic member 300 has a pressed part 304. The pressed part 304 is located radially outside the contact part 302 and contacts the protruding part 162. The pressed part 304 is provided on the outer peripheral side of the surface of the elastic member 300 that faces the mounting plate 160 and contacts the inner peripheral edge of the front end of the protruding part 162.

[0100] The pressed portion 304 is located radially outside the second contact point 302b. The second contact point 302b is located radially outside the first contact point 302a. Further, the pressed portion 304 is located near the separating portion 506 with respect to the second contact point 302b. The second contact point 302b is located near the separating portion 506 with respect to the first contact point 302a.

[0101] Thus, a force that presses the pressed portion 304 of the elastic member 300 from the protruding portion 162 toward the separating portion 506 always acts thereon. Further, a force that presses the second contact point 302b of the elastic member 300 from the annular protrusion 508 toward the mounting plate 160 always acts thereon. Further, a force that presses the first contact point 302a of the elastic member 300 from the first clamping surface 160d toward the separating portion 506 always acts thereon. The restoring force of the elastic member 300 acts as a force that acts on the mounting plate 160 toward the valve element 202.

[0102] According to the above-described structure, by dimension management of the protruding height of the protruding portion 162, the protruding height of the annular protrusion 508, and the axial length of the large-diameter portion 204a, deviation of the acting force of the elastic member 300 is suppressed. That is, according to the second modification example, the same operational effects as those of the above-described embodiment can also be achieved.

[0103] Figure 11B FIG. is a schematic cross-sectional view of the valve unit 600, the mounting plate 160, and the elastic member 300 according to the third modification example. In the third modification example, a separating portion 606 is provided in place of the separating portion 506 of the above-described second modification example. In the third modification example, only the structure of the separating portion 606 is different from that of the second modification example, and all other structures are the same as those of the second modification example. Therefore, here, the structure different from that of the second modification example will be described, and the same reference numerals will be given to the structures the same as those of the second modification example, and the detailed description thereof will be omitted.

[0104] As Figure 11B shown, the separating portion 606 is formed of a metal plate of a member separated from the valve element 202 and the shaft portion 204. The separating portion 606 includes an annular main body portion 608 having a hole 606a at the center. The separating portion 606 is axially separated from the valve element 202. The small-diameter portion 204b of the shaft portion 204 is inserted through the hole 606a of the separating portion 606.

[0105] The annular main body portion 608 of the separating portion 606 includes a second clamping surface 608a opposed to the mounting plate 160. The second clamping surface 608a is formed of an annular flat surface and contacts the stepped surface 204c. The outer diameters of the annular main body portion 608 and the second clamping surface 608a are larger than the outer diameter of the stepped surface 204c and smaller than the inner diameter of the protruding portion 162. Therefore, the portion of the second clamping surface 608a that is radially outside the portion opposed to the stepped surface 204c is axially opposed to the first clamping surface 160d.

[0106] The second clamping surface 608a is axially separated from the first clamping surface 160d. According to the amount of the gap between the second clamping surface 608a and the first clamping surface 160d, the maximum axial separation amount between the mounting plate 160 and the separating portion 606 is set. Moreover, the clamping portion 220 is constituted by the second clamping surface 608a and the first clamping surface 160d.

[0107] Compare Figure 11B and Figure 11A It can be clearly seen that the separating portion 606 of the third modification example is constituted only by the annular protrusion 508 in the separating portion 506 of the second modification example. That is to say, the separating portion 606 of the third modification example is a structure in which the radially outer portion of the annular protrusion 508 is omitted from the separating portion 506 of the second modification example. Therefore, the separating portion 606 is different from the separating portion 506 only in that it does not have a portion axially opposed to the protruding portion 162, and other structures are the same as those of the separating portion 506. According to the third modification example, the same effects as those of the second modification example described above can also be achieved.

[0108] Figure 12 FIG. is a schematic cross-sectional view of the valve unit 700, the mounting plate 170, and the elastic member 300 of the fourth modification example. In the fourth modification example, the mounting plate 170 is provided in place of the mounting plate 140 of the above-described embodiment, and the separating portion 706 is provided in place of the separating portion 206 of the above-described embodiment. In the fourth modification example, only the structures of the mounting plate 170 and the separating portion 706 are different from those of the above-described embodiment, and other structures are all the same as those of the above-described embodiment. Therefore, here, the structures different from those of the above-described embodiment will be described, and the same reference numerals are given to the structures the same as those of the above-described embodiment, and their detailed descriptions are omitted.

[0109] As Figure 12 shown, the mounting plate 170 includes a main body portion 170b including an insertion through-hole 170a. A first surface 170c opposed to the tapered surface 202c is provided on the main body portion 170b. And, a first clamping surface 170d is provided on the side of the main body portion 170b opposite to the first surface 170c. The first clamping surface 170d is opposed to the separating portion 706. A protruding portion 172 protruding toward the separating portion 706 is provided on the radially inner side of the first clamping surface 170d.

[0110] The protruding portion 172 is provided on the radially inner side of the first clamping surface 170d and extends annularly. The protruding portion 172 is provided on the periphery of the insertion through-hole 170a. That is to say, the insertion through-hole 170a penetrates from the first surface 170c to the protruding portion 172. In a state where the first surface 170c is in contact with the tapered surface 202c, the stepped surface 204c of the shaft portion 204 protrudes from the insertion through-hole 170a.

[0111] The separation part 706 is composed of a metal plate of a component separated from the valve core 202 and the shaft part 204. The separation part 706 is in the shape of a disc with a hole 706a formed in the center, and is axially separated from the valve core 202. The small-diameter part 204b of the shaft part 204 is inserted through the hole 706a of the separation part 706.

[0112] The separation part 706 has a surface 706b facing the mounting plate 170. A ring-shaped protrusion 708 is provided on the surface 706b. The ring-shaped protrusion 708 protrudes from the surface 706b toward the mounting plate 170. The ring-shaped protrusion 708 is provided at the outer peripheral edge of the separation part 706. A second clamping surface 708a is provided at the front end in the protruding direction of the ring-shaped protrusion 708. The second clamping surface 708a is composed of a ring-shaped plane.

[0113] The separation part 706 is mounted on the valve core 202 and the shaft part 204 by riveting the front end of the small-diameter part 204b. In this state, the surface 706b contacts the stepped surface 204c. The inner diameter of the ring-shaped protrusion 708 is larger than the outer diameter of the stepped surface 204c and larger than the outer diameter of the protruding part 172. The second clamping surface 708a and the first clamping surface 170d are axially opposed to each other.

[0114] The second clamping surface 708a and the first clamping surface 170d are axially separated from each other. The maximum axial separation amount between the mounting plate 170 and the separation part 706 is set according to the gap amount between the second clamping surface 708a and the first clamping surface 170d. The gap amount between the second clamping surface 708a and the first clamping surface 170d is larger than the plate thickness of the elastic member 300. Moreover, a clamping part 220 is constituted by the second clamping surface 708a and the first clamping surface 170d.

[0115] In addition, the protruding part 172 provided on the mounting plate 170 is radially separated from the second clamping surface 708a and the clamping part 220. Furthermore, the front end of the protruding part 172 protrudes toward the separation part 706 beyond the second clamping surface 708a of the ring-shaped protrusion 708. That is to say, the axial height of the protruding part 172 is larger than the maximum separation amount between the second clamping surface 708a and the first clamping surface 170d.

[0116] The elastic member 300 has a contact part 302 located between the second clamping surface 708a and the first clamping surface 170d. That is to say, the contact part 302 is the part of the elastic member 300 located between the second clamping surface 708a and the first clamping surface 170d. A first contact point 302a contacting the first clamping surface 170d and a second contact point 302b contacting the second clamping surface 708a are provided on the contact part 302.

[0117] The first contact point 302a is provided at the outer peripheral end of the surface of the elastic member 300 facing the mounting plate 170. The second contact point 302b contacts the front end of the annular protrusion 708, that is, the inner peripheral edge of the second clamping surface 708a. Therefore, the second contact point 302b is located radially inward of the first contact point 302a.

[0118] Moreover, the elastic member 300 has a pressed portion 304. The pressed portion 304 is located radially inward of the contact portion 302 and contacts the protruding portion 172. The pressed portion 304 is provided on the inner peripheral side of the surface of the elastic member 300 facing the mounting plate 170 and contacts the outer peripheral edge of the front end of the protruding portion 172.

[0119] The pressed portion 304 is located radially inward of the second contact point 302b. The second contact point 302b is located radially inward of the first contact point 302a. Moreover, the pressed portion 304 is located on the side of the separation portion 706 with respect to the second contact point 302b. The second contact point 302b is located on the side of the separation portion 706 with respect to the first contact point 302a.

[0120] Thus, a force pressing from the protruding portion 172 toward the separation portion 706 always acts on the pressed portion 304 of the elastic member 300. Moreover, a force pressing from the annular protrusion 708 toward the mounting plate 170 always acts on the second contact point 302b of the elastic member 300. Moreover, a force pressing from the first clamping surface 170d toward the separation portion 706 always acts on the first contact point 302a of the elastic member 300. The restoring force of the elastic member 300 functions as an acting force that acts on the mounting plate 170 toward the valve element 202.

[0121] According to the above structure, by dimension management of the protruding height of the protruding portion 172, the protruding height of the annular protrusion 708, and the axial length of the large-diameter portion 204a, the deviation of the acting force of the elastic member 300 is suppressed. That is, according to the fourth modification example, the same operational effects as those of the above-described embodiment can also be achieved.

[0122] Figure 13 FIG. 16 is a schematic cross-sectional view of the valve unit 800, the mounting plate 180, and the elastic member 300 according to the fifth modification example. Here, a structure different from that of the above-described embodiment will be described, and the same reference numerals are given to the structures that are the same as those of the above-described embodiment, and the detailed description thereof will be omitted. The valve unit 800 includes a valve element 202, a shaft portion 204, and a separation portion 806. The valve element 202 has a contact surface 202a. Moreover, a raised portion 202b is provided on the side of the valve element 202 opposite to the contact surface 202a. The cross-sectional shape of the raised portion 202b orthogonal to the axial direction is circular and extends in the axial direction. Here, the axial length of the raised portion 202b is smaller than the axial thickness from the contact surface 202a to the raised portion 202b.

[0123] The raised portion 202b is located on the opposite side of the abutment surface 202a, i.e., near the shaft portion 204. A second clamping surface 802d intersecting the axial direction of the shaft portion 204 is formed at the front end of the raised portion 202b. Here, the second clamping surface 802d is an annular flat surface orthogonal to the shaft portion 204. However, the second clamping surface 802d may also be inclined in the same manner as the above-mentioned conical surface 202c. The shaft portion 204 extends axially from the center of the second clamping surface 802d. And a protrusion 808 is provided on the radially outer side of the second clamping surface 802d. The protrusion 808 is provided on the outer peripheral edge of the raised portion 202b and is radially separated from the shaft portion 204.

[0124] The mounting plate 180 includes a main body portion 180b having an insertion through-hole 180a. A first surface 180c opposed to the second clamping surface 802d is provided on the main body portion 180b. And a second surface 180d is provided on the opposite side of the main body portion 180b from the first surface 180c. An annular protrusion 182 is provided on the first surface 180c. The annular protrusion 182 protrudes toward the valve element 202 from the first surface 180c. The annular protrusion 182 is provided on the inner peripheral edge of the mounting plate 180. A first clamping surface 182a is provided at the front end in the protruding direction of the annular protrusion 182. The first clamping surface 182a is composed of an annular flat surface. The insertion through-hole 180a penetrates from the second surface 180d to the first clamping surface 182a.

[0125] The large-diameter portion 204a of the shaft portion 204 is inserted through the insertion through-hole 180a. The inner diameter of the insertion through-hole 180a is larger than the diameter of the large-diameter portion 204a. And the length from the second surface 180d to the first clamping surface 182a, i.e., the axial length of the insertion through-hole 180a, is smaller than the axial length of the large-diameter portion 204a.

[0126] The small-diameter portion 204b is inserted through the separation portion 806. In a state where the separation portion 806 abuts against the step surface 204c, the front end of the small-diameter portion 204b is riveted. Thereby, the relative movement between the separation portion 806 and the shaft portion 204 is restricted.

[0127] The elastic member 300 is provided in the gap formed between the valve element 202 and the mounting plate 180. More specifically, the first clamping surface 182a of the annular protrusion 182 and the second clamping surface 802d of the valve element 202 are opposed to each other with an axial separation. The maximum separation amount between the first clamping surface 182a and the second clamping surface 802d is larger than the plate thickness of the elastic member 300. And a clamping portion 220 is formed by the first clamping surface 182a and the second clamping surface 802d.

[0128] Moreover, the protruding portion 808 provided on the valve element 202 is radially separated from the first clamping surface 182a and the clamping portion 220. Further, the front end of the protruding portion 808 protrudes toward the mounting plate 180 beyond the first clamping surface 182a of the annular protrusion 182. That is to say, the axial height of the protruding portion 808 is larger than the maximum separation amount between the first clamping surface 182a and the second clamping surface 802d.

[0129] The elastic member 300 has a contact portion 302 located between the first clamping surface 182a and the second clamping surface 802d. That is to say, the contact portion 302 is the portion of the elastic member 300 located between the first clamping surface 182a and the second clamping surface 802d. A first contact point 302a in contact with the first clamping surface 182a and a second contact point 302b in contact with the second clamping surface 802d are provided on the contact portion 302.

[0130] The first contact point 302a is in contact with the front end of the annular protrusion 182, that is, the outer periphery of the first clamping surface 182a. The second contact point 302b is provided at the inner peripheral end of the surface of the elastic member 300 on the side of the valve element 202. Therefore, the first contact point 302a is located radially outside the second contact point 302b.

[0131] Moreover, the elastic member 300 has a pressed portion 304. The pressed portion 304 is located radially outside the contact portion 302 and is in contact with the protruding portion 808. The pressed portion 304 is provided on the outer peripheral side of the surface of the elastic member 300 on the side of the valve element 202 and is in contact with the inner peripheral edge of the front end of the protruding portion 808.

[0132] The pressed portion 304 is located radially outside the first contact point 302a. The first contact point 302a is located radially outside the second contact point 302b. Moreover, the pressed portion 304 is located near the mounting plate 180 compared with the first contact point 302a. The first contact point 302a is located near the mounting plate 180 compared with the second contact point 302b.

[0133] According to the above structure, the elastic member 300 presses the valve element 202 in the direction away from the mounting plate 180. By managing the dimensions of the protruding height of the protruding portion 808, the protruding height of the annular protrusion 182, and the axial length of the large-diameter portion 204a, the deviation of the acting force of the elastic member 300 is suppressed. That is to say, according to the fifth modification example, the same effect as the above-described embodiment can also be achieved.

[0134] As described above, the embodiments of the present disclosure have been described with reference to the drawings, but the present disclosure is of course not limited to such embodiments. As long as those skilled in the art can clearly understand: within the scope described in the claims, various modification examples or modification cases can obviously be conceived, and these modification examples or modification cases of course also belong to the technical scope of the present disclosure.

[0135] In the above-described embodiments and each modification, an example in which the valve device 100 is a wastegate valve that opens and closes the wastegate port 37 has been described. However, it is not limited thereto, and the valve device 100 can also be applied to other valves that open and close an opening. For example, the valve device 100 can also be applied to a valve that opens and closes an opening that communicates two turbine vortex flow paths in a turbine housing of a twin-scroll type supercharger.

[0136] In the above-described embodiments and the first modification, the protruding portion 208 provided on the separation portion 206 is located radially outside the clamping portion 220. However, in the above-described embodiments and the first modification, the annular protrusion 142 can also be provided radially outside the protruding portion 208. In this case, the protruding portion 208 is located radially inside the clamping portion 220.

[0137] In the above-described fifth modification, the protruding portion 808 provided on the valve element 202 is located radially outside the clamping portion 220. However, in the above-described fifth modification, the annular protrusion 182 can also be provided radially outside the protruding portion 808. In this case, the protruding portion 808 is located radially inside the clamping portion 220.

[0138] In the above-described fifth modification, the second clamping surface 802d and the protruding portion 808 are provided on the valve element 202, and the annular protrusion 182 and the first clamping surface 182a are provided on the mounting plate 180. However, in the fifth modification, the annular protrusion 182 and the first clamping surface 182a can also be provided on the valve element 202, and the second clamping surface 802d and the protruding portion 808 can be provided on the mounting plate 180. In this case, the protruding portion 808 can be located radially inside or outside the annular protrusion 182.

[0139] In short, it is sufficient that the clamping portion is configured to include the first clamping surface provided on the mounting plate and the second clamping surface provided on the valve unit and axially separated from the first clamping surface. And, it is sufficient that the protruding portion is provided on either the valve unit or the mounting plate, and the front end of the protruding portion protrudes axially beyond the first clamping surface and the second clamping surface. And, it is sufficient that the elastic member has a contact portion located between the first clamping surface and the second clamping surface and a pressed portion located radially inside or outside the shaft portion with respect to the contact portion and in contact with the protruding portion.

[0140] In the above-described embodiment, second modification, fourth modification, and fifth modification, a facing portion that faces the protruding portion in the axial direction is provided on one of the valve unit and the mounting plate where the protruding portion is not provided. Specifically, the second surface 140d of the embodiment, the surface 506b of the second modification, the first clamping surface 170d of the fourth modification, and the first surface 180c of the fifth modification function as the facing portion that faces the protruding portion in the axial direction. In this way, compared with the case where the facing portion is not provided, the elastic member 300 is less likely to be exposed to the outside when the facing portion is provided. As a result, by providing the facing portion, the durability of the elastic member 300 in a high-temperature environment is improved.

[0141] Reference Signs

[0142] 140, 150, 160, 170, 180 - mounting plate, 140a, 150a, 160a, 170a, 180a - insertion through-hole, 140d - second surface, 142a, 152a, 160d, 170d, 182a - first clamping surface, 162, 172, 208, 808 - protruding portion, 180c - first surface, 200, 400, 500, 600, 700, 800 - valve unit, 202 - valve element, 204 - shaft portion, 206, 506, 606, 706, 806 - separating portion, 206b, 508a, 608a, 708a, 802d - second clamping surface, 220 - clamping portion, 300 - elastic member, 302 - contact portion, 304 - pressed portion, 506b - surface.

Claims

1. A valve structure, characterized in that, it includes: a valve unit including a valve core, a shaft portion extending axially from the valve core, and a separation portion provided on the shaft portion and separated from the valve core axially; a mounting plate located between the valve core and the separation portion and including an insertion through-hole, and the shaft portion is inserted through the insertion through-hole; a clamping portion including a first clamping surface provided on the mounting plate and a second clamping surface provided on the valve unit and separated from the first clamping surface axially; a protruding portion provided on either the valve unit or the mounting plate, and the front end of the protruding portion protrudes axially beyond the first clamping surface and the second clamping surface; and an elastic member having a contact portion located between the first clamping surface and the second clamping surface, and a pressed portion located radially inside or outside the shaft portion relative to the contact portion and in contact with the protruding portion.

2. The valve structure according to claim 1, characterized in that, it includes an opposing portion provided on the other one of the valve unit and the mounting plate and opposing the protruding portion axially.

3. A supercharger, characterized in that, it includes the valve structure according to claim 1 or 2.

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