JP7409126B2 - valve device - Google Patents

Description

The present disclosure relates to a valve device.

Conventionally, as described in Patent Document 1, a protrusion formed on the inside of a cylindrical seal member is formed by contact between the seal surface of a valve that rotates relative to the housing and a protrusion formed on a cylindrical seal member. A valve device that closes a flow path is known.

JP2018-91321A

According to studies by the inventors, since the protrusion protrudes from the outer circumference of the seal member toward the outside in the radial direction of the seal member, a space is formed between the protrusion and the outer circumference of the seal member. As a result, when the opening degree of the flow path is relatively small, the flow of fluid flowing through the flow path inside the seal member and along the outer circumference of the seal member is separated by this space, and a vortex is generated. When this generated vortex comes into contact with the protrusion, sound waves are scattered and sound is generated. Therefore, noise may be generated when the opening degree of the flow path is relatively small.

The present disclosure aims to provide a valve device that suppresses noise generation.

The invention according to claim 1 is a valve device, which includes a housing (10) having a valve chamber (11), a housing space (14) communicating with the valve chamber, and a housing (10) communicating with the valve chamber. A valve seat member (30) that has a cylindrical portion (32) including a valve seat flow path (31) through which fluid flows from the opposite side, and a seal member (40) that covers the cylindrical portion, and is disposed in the accommodation space. , a valve member (20) that is housed in the valve chamber and opens and closes the valve seat flow path by rotating around the rotation axis (O), and the seal member is located between the valve seat flow path and the cylindrical portion. A side wall covering part (41) that covers the opposite side, a protruding part (42) that projects from the side wall covering part toward the outside of the sealing member, and a valve chamber that covers the end of the cylindrical part on the rotating shaft side. The valve member rotates around the rotation axis and comes into contact with the protrusion, thereby closing the gap between the valve member and the sealing member, closing the valve seat flow path, and closing the valve chamber. The side covering part includes a covering surface (412, 451, 761) facing the rotating shaft side, a covering stepped surface (415) that intersects the covering surface and is connected to the covering surface and the protruding part, and a covering surface and the covering surface. The protrusion includes a covering end (416, 453, 763) that is a boundary with the stepped surface, and the protruding part includes the covering surface in a cross section taken in the axial direction of the cylindrical part including the axis (CL) of the cylindrical part. The valve chamber side covering part has a convex part (45) that is located on the opposite side of the rotation axis with respect to the straight line (Li, Lc, Lc2) extending in the direction along the rotation axis. The covering step surface is formed in a stepped shape, and the convex portion is a valve device including a covering surface (451) and a covering end .
Further, the invention according to claim 2 provides a valve device, which includes a housing (10) having a valve chamber (11), a housing space (14) communicating with the valve chamber, and a valve chamber communicating with the valve chamber. The valve seat member (30) has a cylindrical part (32) including a valve seat flow path (31) through which fluid flows from the opposite side, and a seal member (40) that covers the cylindrical part, and is disposed in the accommodation space. ), and a valve member (20) that is housed in the valve chamber and opens and closes the valve seat flow path by rotating around the rotation axis (O), and the sealing member is configured to open and close the valve seat flow path in the cylindrical portion. A side wall covering part (41) that covers the side opposite to the road, a protruding part (42) that projects from the side wall covering part toward the outside of the sealing member, and a part that covers the end of the cylindrical part on the rotating shaft side. a valve chamber side covering part (411), the valve member rotates around the rotation axis and comes into contact with the protrusion to close the gap between the valve member and the sealing member and close the valve seat flow path; The valve chamber side covering portion includes a covering surface (412, 451, 761) facing the rotating shaft side, a covering step surface (415) that intersects the covering surface and is connected to the covering surface and the protrusion, and a covering surface. and a covering end (416, 453, 763) that is a boundary between the covering step surface and the protruding part, in a cross section taken in the axial direction of the cylindrical part including the axis (CL) of the cylindrical part, It is located on the opposite side of the rotation axis with respect to the straight line (Li, Lc, Lc2) extending in the direction along the covered surface, and the fluid flowing through the valve seat flow path flows from the valve seat flow path side of the covered surface to the valve. This is a valve device that allows flow to flow in a direction along the opposite side of the seat flow path.

As a result, since the protruding part is located on the opposite side of the rotation axis with respect to the straight line, collision of the vortex generated between the valve chamber side covering part and the protruding part with the protruding part is suppressed. Therefore, the generation of noise is suppressed.

Note that the reference numerals in parentheses attached to each component etc. indicate an example of the correspondence between the component etc. and specific components etc. described in the embodiments to be described later.

FIG. 1 is a schematic diagram of an engine system to which the valve device of the first embodiment is applied. It is an external view of a valve device. 3 is a sectional view taken along line III-III in FIG. 2. FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2, and is a view in which the position of the valve member is different from that in FIG. 3. FIG. 3 is a perspective view of a valve member of the valve device. FIG. 3 is a perspective view of a valve seat member of the valve device. It is a sectional view of a valve seat member. 8 is a sectional view taken along line VIII in FIG. 7. FIG. 5 is a partially enlarged view of FIG. 4. FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2, and is a view in which the position of the valve member is different from that in FIG. 3. FIG. 3 is a schematic cross-sectional view of a sealing member of the valve device when exhaust gas flows through a valve seat flow path. FIG. 7 is a schematic cross-sectional view of a sealing member of a valve device according to a second embodiment. FIG. 7 is a schematic cross-sectional view of a sealing member of a valve device according to a third embodiment. It is a schematic cross-sectional view of the sealing member of the valve device of 4th Embodiment. It is an external view of the valve member and the valve seat member when the valve member of the valve device of 5th Embodiment closes the valve seat flow path. 16 is a sectional view taken along line XVI-XVI in FIG. 15. FIG. 16 is a sectional view taken along line XVII-XVII in FIG. 15. FIG. 16 is a sectional view taken along line XVIII-XVIII in FIG. 15. FIG. 16 is a sectional view taken along line XIX-XIX in FIG. 15. FIG. FIG. 3 is a cross-sectional view of a comparative example. It is a schematic sectional view of the sealing member of the valve device of other embodiments. It is a schematic sectional view of the sealing member of the valve device of other embodiments. FIG. 7 is an external view of a valve member and a valve seat member of a valve device of another embodiment when the valve member closes a valve seat flow path. FIG. 7 is an external view of a valve member and a valve seat member of a valve device of another embodiment when the valve member closes a valve seat flow path.

Hereinafter, embodiments will be described with reference to the drawings. Note that in each of the following embodiments, parts that are the same or equivalent to each other will be denoted by the same reference numerals, and the description thereof will be omitted.

(First embodiment)
The valve device 1 of this embodiment is applied to, for example, an engine system 90. First, this engine system 90 will be explained.

As shown in FIG. 1, the engine system 90 includes an engine 91, an intake system 92, an exhaust system 93, a supercharger 94, an exhaust recirculation system 95, a valve device 1, and an ECU 96.

Engine 91 has a cylinder 911 and a piston 912. A piston 912 is housed within the cylinder 911, and a combustion chamber 910 is defined by the cylinder 911 and the piston 912.

The intake system 92 supplies air to the engine 91 from outside air. Specifically, the intake system 92 includes an intake pipe 921, an intake manifold 922, an air cleaner 923, an intercooler 924, a throttle 925, and the like. Note that the outside air here refers to the air outside the engine system 90. Further, below, for convenience, the air supplied to the engine 91 will be referred to as intake air.

The intake pipe 921 includes an intake flow path 920 and guides intake air into the combustion chamber 910. Further, one end of the intake pipe 921 is open to the outside air. Furthermore, the other end of the intake pipe 921 is connected to an intake manifold 922.

Intake manifold 922 is connected to the other end of intake pipe 921 and engine 91. Further, the intake manifold 922 includes the same number of branched flow paths as the number of cylinders 911 of the engine 91.

The air cleaner 923 is arranged at one end of the intake pipe 921 that is open to the outside air. Additionally, the air cleaner 923 removes foreign matter contained in the air taken into the engine system 90 from the outside air.

The intercooler 924 is disposed in the intake pipe 921 between a supercharger 94 and a throttle 925, which will be described later. Further, the intercooler 924 cools intake air that has been compressed and heated by a compressor 941 of a supercharger 94, which will be described later.

The throttle 925 is electrically connected to an ECU 96, which will be described later. Thereby, the throttle 925 adjusts the amount of air supplied to the engine 91 based on the signal from the ECU 96.

Exhaust system 93 releases gas exhausted from engine 91 to the outside air. Specifically, the exhaust system 93 includes an exhaust pipe 931, an exhaust manifold 932, and an exhaust purification unit 933. Further, hereinafter, for convenience, the gas discharged from the engine 91 will be referred to as exhaust gas.

Exhaust pipe 931 includes exhaust flow path 930 and guides exhaust from engine 91 to the outside air. Further, one end of the exhaust pipe 931 is open to the outside air. Furthermore, the other end of the exhaust pipe 931 is connected to an exhaust manifold 932.

Exhaust manifold 932 is connected to the other end of exhaust pipe 931 and engine 91. Further, the exhaust manifold 932 includes the same number of branched flow paths as the number of cylinders 911 of the engine 91.

The exhaust purification unit 933 is arranged in the exhaust pipe 931. Further, the exhaust purification unit 933 decomposes hydrocarbons contained in the exhaust gas from the engine 91 and captures particulate matter contained in the exhaust gas from the engine 91, for example.

The supercharger 94 compresses intake air within the intake pipe 921 by utilizing the energy of exhaust gas from the engine 91. Further, the supercharger 94 supplies this compressed intake air to the combustion chamber 910 via an intake pipe 921, an intercooler 924, a throttle 925, and an intake manifold 922. Specifically, supercharger 94 includes a compressor 941, a turbine 942, and a shaft 943.

Compressor 941 compresses intake air by rotating.

The turbine 942 is disposed in the exhaust flow path 930 between the engine 91 and the exhaust purification unit 933. Further, the turbine 942 is rotated by the energy of exhaust gas from the engine 91.

Shaft 943 is connected to compressor 941 and turbine 942. Therefore, when the turbine 942 rotates, the shaft 943 connected to the turbine 942 rotates, and thus the compressor 941 rotates. Therefore, compressor 941 and turbine 942 rotate synchronously.

The exhaust gas recirculation system 95 recirculates the exhaust gas that has passed through the turbine 942 to the intake flow path 920 . Specifically, the exhaust gas recirculation system 95 includes an EGR pipe 951 and an EGR cooler 952.

The EGR pipe 951 is connected to the exhaust pipe 931 on the downstream side of the exhaust purification unit 933 and the intake pipe 921 on the upstream side of the compressor 941. Further, the EGR pipe 951 includes an EGR flow path 950 and guides the exhaust gas that has flowed through the exhaust purification unit 933 to the compressor 941.

EGR cooler 952 is arranged in EGR pipe 951. Further, the EGR cooler 952 cools the exhaust gas flowing through the EGR flow path 950.

The valve device 1 is connected to an EGR pipe 951 and an intake pipe 921. Further, the valve device 1 is electrically connected to an ECU 96, which will be described later. Thereby, the valve device 1 opens and closes the EGR passage 950 based on the signal from the ECU 96.

The ECU 96 is mainly composed of a microcomputer, and includes a CPU, ROM, RAM, flash memory, I/O, and a bus line connecting these components. Further, the ECU 96 controls the opening degree of the EGR passage 950 with respect to the intake passage 920 by controlling the valve device 1 . Thereby, the flow rate of exhaust gas flowing into the intake flow path 920 via the EGR flow path 950 is adjusted.

The engine system 90 is configured as described above.

Next, details of the configuration of the valve device 1 will be explained. Here, the valve device 1 is a rotary type valve that adjusts the opening degree of a flow path by rotating a valve member 20, which will be described later. Thereby, the valve device 1 adjusts the flow rate of exhaust gas flowing into the intake flow path 920 via the EGR flow path 950.

Specifically, the valve device 1 includes a housing 10, a valve member 20, and a valve seat member 30, as shown in FIGS. 2 to 8.

The housing 10 is made of metal such as aluminum alloy, for example. Further, the housing 10 is formed in a cylindrical shape and has a confluence section where the intake flow path 920 and the EGR flow path 950 join. Furthermore, the housing 10 accommodates a motor (not shown), a valve member 20 and a valve seat member 30, which will be described later. Specifically, as shown in FIGS. 2 to 4, the housing 10 includes a valve chamber inner wall 101, a valve chamber 11, an upstream inner wall 102, an upstream flow path 12, a downstream inner wall 103, a downstream flow path 13, It has an accommodation inner wall 104, an accommodation space 14, and a cover 105.

The valve chamber inner wall 101 defines the valve chamber 11, as shown in FIGS. 3 and 4. The valve chamber 11 rotatably accommodates the valve member 20. The upstream inner wall 102 defines the upstream flow path 12 . The upstream flow path 12 communicates with the air cleaner 923 and the valve chamber 11 . The downstream inner wall 103 defines a downstream flow path 13. The downstream flow path 13 is formed coaxially with the upstream flow path 12. Further, the downstream flow path 13 communicates with the valve chamber 11 and the compressor 941 side of the intake flow path 920 . The housing inner wall 104 defines the housing space 14. The accommodation space 14 accommodates a valve seat member 30, which will be described later. As shown in FIG. 2, the cover 105 accommodates a motor (not shown).

The valve member 20 is accommodated in the valve chamber 11 so as to be rotatable relative to the housing 10, as shown in FIGS. 3 and 4. Further, the valve member 20 is driven by a motor (not shown). Thereby, the valve member 20 rotates around the valve rotation axis O. Further, the valve member 20 opens and closes a valve seat flow path 31 of a valve seat member 30, which will be described later, by rotating around the valve rotation axis O. Specifically, the valve member 20 has a valve member main body portion 21, an upper arm 22, a lower arm 23, an upper shaft 24, and a lower shaft 25, as shown in FIG.

The valve member main body portion 21 is made of, for example, a synthetic resin such as polyphenylene sulfide. Therefore, the valve member main body portion 21 has relatively high heat resistance. Further, the valve member main body portion 21 is formed in a cylindrical shape. Further, the valve member main body portion 21 includes a valve member outer surface 211, a first curved surface portion 21a, a second curved surface portion 21b, a first sealing surface 212, and a second sealing surface 213.

The valve member outer surface 211 is the outer surface of the valve member main body portion 21 . The first curved surface portion 21a is formed in a curved shape, and is formed to be concave relative to the valve member outer surface 211. The second curved surface portion 21b is formed in a curved shape, and is formed to be further depressed than the first curved surface portion 21a. The first sealing surface 212 is a surface formed at a step between the valve member outer surface 211 and the first curved surface portion 21a. Further, the first sealing surface 212 is formed in a semi-cylindrical shape with a center angle of 180 degrees. The second sealing surface 213 is formed at a step between the first curved surface portion 21a and the second curved surface portion 21b. Further, the second sealing surface 213 is formed in a semi-cylindrical shape with a center angle of 180 degrees. Further, the center of the semicircle of the second sealing surface 213 coincides with the center of the semicircle of the first sealing surface 212. Further, the radius of the second sealing surface 213 centered on this semicircle is smaller than the radius of the first sealing surface 212 centered on this semicircle.

The upper arm 22 is made of, for example, a synthetic resin material such as polyphenylene sulfide, similarly to the valve member main body portion 21. Further, the upper arm 22 is formed in a fan shape and is disposed on the side of the upper shaft 24 described later in the valve member main body portion 21.

The lower arm 23, like the valve member body 21 and the upper arm 22, is made of a synthetic resin material such as polyphenylene sulfide. Further, the lower arm 23 is formed in a fan shape and is disposed on the lower shaft 25 side, which will be described later, of the valve member main body portion 21.

The upper shaft 24 is made of metal such as stainless steel and has a rod shape. Further, the upper shaft 24 is disposed on the upper arm 22 and extends from the upper arm 22 in the direction of the valve rotation axis O and in the direction away from the valve member body 21. Furthermore, the upper shaft 24 is rotatably supported by a bearing (not shown) arranged in the housing 10.

Like the upper shaft 24, the lower shaft 25 is made of metal such as stainless steel and has a rod shape. Further, the lower shaft 25 is disposed on the lower arm 23 and extends from the lower arm 23 in the direction of the valve rotation axis O and in the direction away from the valve member body 21. Further, the lower shaft 25 is rotatably supported together with the upper shaft 24 by a not-illustrated bearing disposed in the housing 10.

The valve seat member 30 is made of resin or the like. Moreover, the valve seat member 30 is arranged in the accommodation space 14 of the housing 10, as shown in FIGS. 3 and 4. Moreover, the valve seat member 30 is formed in a cylindrical shape. Specifically, the valve seat member 30 has a cylindrical portion 32, a flange portion 33, and a seal member 40, as shown in FIGS. 6 and 7.

The cylinder part 32 is formed in a cylindrical shape here, and has a valve seat flow path 31, an axis CL, a first side wall part 321, and a second side wall part 322. The valve seat flow path 31 is formed inside the cylindrical portion 32, and communicates with the valve chamber 11 and the EGR flow path 950, as shown in FIGS. 3 and 4. The axis CL is a center line extending in the axial direction of the cylindrical portion 32, as shown in FIGS. 6 and 7. The first side wall portion 321 has a semi-cylindrical shape. The second side wall portion 322 has a semi-cylindrical shape. Further, the radius of the second side wall portion 322 is the same as the radius of the first side wall portion 321. Further, the second side wall portion 322 and the first side wall portion 321 are aligned in the radial direction of the cylindrical portion 32 such that the center of the radius of the second side wall portion 322 and the center of the radius of the first side wall portion 321 coincide with each other. There is. Thereby, the inner circumferential surface of the second side wall portion 322 is continuous with the inner circumferential surface of the first side wall portion 321. Further, the outer circumferential surface of the second side wall portion 322 is continuous with the outer circumferential surface of the first side wall portion 321. Furthermore, here, the length of the second side wall 322 in the axis line CL direction at the boundary between the second side wall 322 and the first side wall 321 is the length of the second side wall 322 at the boundary between the second side wall 322 and the first side wall 321. The length of the first side wall portion 321 in the direction of the axis CL is greater than the length of the first side wall portion 321 in the direction of the axis CL.

The flange portion 33 is connected to the side of the cylinder portion 32 opposite to the valve rotation axis O side, and is located on the EGR passage 950 side of the valve seat member 30. Further, the flange portion 33 protrudes from the cylindrical portion 32 toward the outside in the radial direction of the cylindrical portion 32 . In addition, below, for convenience, the flange part 33 side is described as the EGR flow path 950 side. Further, the side opposite to the flange portion 33 will be referred to as the valve rotation axis O side.

The seal member 40 is made of natural rubber, synthetic rubber, or the like. Further, the seal member 40 covers most of the valve seat member 30. Specifically, as shown in FIG. 7 and FIG. It has two valve chamber side covering parts 431 and a second protrusion part 44 .

The first side wall covering portion 41 covers the first side wall portion 321 of the cylindrical portion 32 of the valve seat member 30. Specifically, the first side wall covering portion 41 is located on the valve seat flow path 31 side of the first side wall portion 321 and on the side opposite to the valve seat flow path 31; It covers the radially inner and radially outer sides of. In addition, below, for convenience, the valve seat flow path 31 side of the cylindrical part 32 is described as the radially inner side of the cylindrical part 32. Further, the side of the cylindrical portion 32 opposite to the valve seat flow path 31 is referred to as the radially outer side of the cylindrical portion 32.

The first protruding portion 42 is connected to the first side wall covering portion 41 on the valve rotation axis O side and on the radially outer side of the cylindrical portion 32 . The first protruding portion 42 protrudes from the first side wall covering portion 41 to the outside of the sealing member 40. Here, the first protruding portion 42 is located on the valve rotation axis O side of the outer side of the cylindrical portion 32 in the direction of the axis CL. Projects outward in the radial direction.

The first valve chamber side covering portion 411 covers the end portion of the first side wall portion 321 on the valve rotation axis O side. Further, here, the first valve chamber side covering portion 411 includes a valve chamber side covering surface 412, a covering stepped surface 415, and a covering end portion 416.

The valve chamber side covering surface 412 is formed into a flat surface and faces toward the valve rotation axis O side.

The covering step surface 415 intersects with the valve chamber side covering surface 412 and is connected to the valve chamber side covering surface 412 and a connecting portion of the first protrusion 42 with the first side wall covering section 41 . Further, the covering step surface 415 faces the first protrusion 42 , and a first sealing space 413 is formed between the covering step surface 415 and the first protrusion 42 .

The covering end portion 416 is a boundary between the valve chamber side covering surface 412 and the covering step surface 415. Further, here, since the valve chamber side covering surface 412 and the covering step surface 415 intersect, the covering end 416 becomes a corner formed by the valve chamber side covering surface 412 and the covering step surface 415. ing.

Here, as shown in FIG. 8, in a cross section including the axis CL of the cylinder part 32 and cut in the direction of the axis CL of the cylinder part 32, the valve chamber side covering surface 412 starts from the valve seat flow path 31 side. A straight line extending in the direction opposite to the seat flow path 31 and passing through the covering end portion 416 is defined as an imaginary line Li. Here, this virtual line Li is located closer to the valve rotation axis O than the first protrusion 42 . That is, the first protruding portion 42 is located on the opposite side to the valve rotation axis O with this imaginary line Li as a reference in a cross section taken in the direction of the axis CL of the tube portion 32 and including the axis CL of the tube portion 32. are doing.

The second side wall covering portion 43 covers the second side wall portion 322 of the cylindrical portion 32 of the valve seat member 30, as shown in FIG. Specifically, the second side wall covering portion 43 covers the radially inner side and the radially outer side of the cylindrical portion 32 of the second side wall portion 322 .

The second valve chamber side covering portion 431 covers the end portion of the second side wall portion 322 on the valve rotation axis O side.

The second protruding portion 44 is connected to the radially inner side of the cylindrical portion 32 on the valve rotation axis O side of the second side wall covering portion 43 and the radially inner side of the cylindrical portion 32 of the second valve chamber side covering portion 431. has been done. Further, the second protruding portion 44 protrudes from the second side wall covering portion 43 and the second valve chamber side covering portion 431 on the side opposite to the valve rotation axis O and inward in the radial direction of the cylindrical portion 32 . Thereby, a second sealing space 433 is formed between the second protrusion 44 and the second side wall covering part 43.

The valve device 1 is configured as described above.

Next, the operation of the valve device 1 will be explained. This valve device 1 opens and closes the EGR passage 950 by rotating the valve member 20 of the valve device 1. Thereby, the valve device 1 adjusts the flow rate of exhaust gas flowing into the intake flow path 920 via the EGR flow path 950.

Specifically, as shown in FIG. 3, when the valve member 20 rotates to close the upstream flow path 12, the valve seat flow path 31 opens. Here, as described above, the valve seat flow path 31 communicates with the EGR flow path 950 and the valve chamber 11. Further, the valve chamber 11 communicates with a downstream flow path 13 . The downstream flow path 13 communicates with the compressor 941 side of the intake flow path 920 . Therefore, at this time, the exhaust gas flowing through the EGR passage 950 flows to the compressor 941 via the valve seat passage 31, the valve chamber 11, and the downstream passage 13. Therefore, at this time, the flow rate of exhaust gas flowing into the intake flow path 920 via the EGR flow path 950 becomes relatively large.

Further, as shown in FIG. 4, when the valve member 20 rotates to close the valve seat flow path 31, the upstream flow path 12 opens. Here, as described above, the upstream flow path 12 communicates with the air cleaner 923 and the valve chamber 11. Therefore, intake air from the air cleaner 923 flows to the compressor 941 via the upstream flow path 12, the valve chamber 11, and the downstream flow path 13.

Also, at this time, the first protrusion 42 comes into contact with the first sealing surface 212 of the valve member 20, as shown in FIG. This closes the gap between the first protrusion 42 and the first sealing surface 212. Further, here, the first protrusion 42 is made of rubber. Furthermore, before the valve member 20 rotates to close the valve seat flow path 31, a first sealing space 413 is formed between the first protrusion 42 and the first valve chamber side covering part 411. Therefore, when the valve member 20 rotates and comes into contact with the first protrusion 42 and the first sealing surface 212, the first protrusion 42 connects the first protrusion 42 and the first valve chamber side covering part 411. It bends and elastically deforms starting from the part so as to fill the first sealing space 413. As a result, the first protrusion 42 is elastically deformed, so that the first protrusion 42 and the first sealing surface 212 are likely to come into close contact with each other. Therefore, here, the contact area between the first protrusion 42 and the first sealing surface 212 is relatively high, and the sealing performance between the first protrusion 42 and the first sealing surface 212 is relatively high. ing.

Furthermore, at this time, the second protrusion 44 comes into contact with the second sealing surface 213 of the valve member 20, similarly to the first protrusion 42. This closes the gap between the second protrusion 44 and the second sealing surface 213. Moreover, at this time, the second protrusion 44 bends and elastically deforms so as to fill the second sealing space 433 starting from the connection between the second protrusion 44 and the second valve chamber side covering part 431. Thereby, similarly to the above, the sealing performance between the second protrusion 44 and the second sealing surface 213 is relatively high.

Therefore, at this time, since the valve seat flow path 31 is closed by the valve member 20, the exhaust gas from the EGR flow path 950 does not flow into the valve seat flow path 31. Therefore, the flow rate of exhaust gas flowing into the intake flow path 920 via the EGR flow path 950 is zero.

Further, as shown in FIG. 10, when the valve member 20 rotates, the valve seat flow path 31 may be opened in a state where the opening degree of the valve seat flow path 31 is relatively small. At this time, similarly to the above, since the upstream flow path 12 is open, the intake air from the air cleaner 923 flows to the compressor 941 via the upstream flow path 12, the valve chamber 11, and the downstream flow path 13. .

Further, since the valve seat flow path 31 is open, the exhaust gas flowing through the EGR flow path 950 flows to the compressor 941 via the valve seat flow path 31, the valve chamber 11, and the downstream flow path 13. In this case, since the opening degree of the valve seat flow path 31 is relatively small, the flow rate of exhaust gas flowing into the intake flow path 920 via the EGR flow path 950 is relatively small.

As described above, the valve device 1 operates. In this valve device 1, the generation of noise is suppressed. This noise suppression will be explained below.

As described above, when the valve seat flow path 31 is open with a relatively small opening degree, the exhaust gas that has flowed through the EGR flow path 950 flows through the valve seat flow path 31 . At this time, as shown in FIG. 11, a part of the exhaust gas flowing through the valve seat flow path 31 flows along the inner surface 414 of the first side wall covering part 41 on the radially inner side of the cylindrical part 32. A part of the exhaust gas flowing along this inner surface 414 flows in a direction along the valve chamber side covering surface 412 from the valve seat flow path 31 side to the side opposite to the valve seat flow path 31. Furthermore, here, a covering stepped surface 415 and a first sealing space 413 are formed. Therefore, the flow of exhaust gas along this valve chamber side covering surface 412 separates from the covering end 416 which is the boundary between the valve chamber side covering surface 412 and the covering step surface 415. This creates a vortex. This generated vortex flows along the imaginary line Li, which is a straight line on the extension of the valve chamber side covering surface 412.

Here, as described above, the first protruding part 42 is connected to the valve rotation axis O with the imaginary line Li as a reference in a cross section taken in the direction of the axis CL of the cylinder part 32 and including the axis CL of the cylinder part 32. is located on the opposite side, that is, on the EGR flow path 950 side. Therefore, the vortex flowing along the virtual line Li is suppressed from colliding with the first protrusion 42. This prevents sound waves from being scattered, thereby suppressing the generation of sound. Therefore, noise is suppressed.

(Second embodiment)
In the second embodiment, the form of the sealing member is different. Other than this, the second embodiment is the same as the first embodiment.

The first valve chamber side covering portion 411 of the seal member 40 further includes a convex portion 45, as shown in FIG.

The convex portion 45 is connected to the radially inner side of the cylindrical portion 32 on the valve chamber side covering surface 412 . Further, the convex portion 45 protrudes from the valve chamber side covering surface 412 toward the valve rotation axis O side. Furthermore, the cross section of the convex portion 45 in the direction of the axis CL of the cylindrical portion 32 has a quadrangular shape. Further, the convex portion 45 includes a convex surface 451 and a convex end portion 453.

The convex surface 451 corresponds to the covering surface, is formed flat, and faces toward the valve rotation axis O side. Further, here, the convex surface 451 is parallel to the valve chamber side covering surface 412. Note that the convex surface 451 may be inclined with respect to the valve chamber side covering surface 412.

Further, here, the covering step surface 415 is integrally formed with the valve chamber side covering surface 412 in a stepped shape, and is connected to the convex surface 451 and the first protrusion 42 . Furthermore, the surface of the covered step surface 415 that is connected to the convex surface 451 intersects with the convex surface 451 . Therefore, this covered step surface 415 forms a step between the convex surface 451 and the first protrusion 42 .

The convex end 453 corresponds to the covering end and is the boundary between the convex surface 451 and the covering step surface 415. In addition, here, since the surface of the covering stepped surface 415 that is connected to the convex surface 451 intersects with the convex surface 451, the convex end portion 453 is a corner formed by the convex surface 451 and the covering stepped surface 415. It has become.

Here, in a cross section including the axis CL of the cylinder part 32 and cut in the direction of the axis CL of the cylinder part 32, a direction along the convex surface 451 from the valve seat flow path 31 side to the side opposite to the valve seat flow path 31. A straight line passing through the convex end portion 453 is defined as a convex virtual line Lc. Here, the convex virtual line Lc is located closer to the valve rotation axis O than the first protrusion 42 . That is, in a cross section taken in the direction of the axis CL of the cylindrical part 32 including the axis CL of the cylindrical part 32, the first protrusion 42 is located on the opposite side to the valve rotation axis O with the imaginary convex line Lc as a reference. positioned.

The second embodiment also provides the same effects as the first embodiment. Specifically, when the valve seat flow path 31 is open, a portion of the exhaust gas flowing through the valve seat flow path 31 flows along the radially inner inner surface 414 of the cylindrical portion 32 of the first side wall covering portion 41. It flows. Further, a part of the exhaust gas flowing along the inner surface 414 flows in a direction from the valve seat flow path 31 side of the convex surface 451 to the side opposite to the valve seat flow path 31 . Further, since a step is formed between the convex surface 451 and the first protrusion 42, the exhaust gas flows along the convex surface 451 at the convex end 453, which is the boundary between the convex surface 451 and the covering step surface 415. This creates a vortex. This vortex flows along the convex virtual line Lc, which is an extension of the convex surface 451.

Here, as described above, the first protrusion 42 is located on the opposite side of the valve rotation axis O with the convex virtual line Lc as a reference. Therefore, the vortex flowing along the convex virtual line Lc is suppressed from colliding with the first protrusion 42. Therefore, similarly to the above, noise is suppressed.

Further, in the second embodiment, the first valve chamber side covering portion 411 can be made relatively small due to the convex portion 45. For example, in the second embodiment, as shown in FIG. 12, the first protrusion 42 may be located on the virtual line Li. Thereby, the amount of rubber used for the first valve chamber side covering portion 411 can be reduced, so the material cost of the valve device 1 can be reduced.

(Third embodiment)
In the third embodiment, the shape of the convex portion of the sealing member is different. Other than this, the second embodiment is the same as the second embodiment.

As shown in FIG. 13, the cross section of the convex portion 45 of the sealing member 40 in the direction of the axis CL of the cylinder portion 32 has a triangular shape. Further, the convex surface 451 faces the valve rotation axis O side and is inclined with respect to the valve chamber side covering surface 412, similarly to the second embodiment.

The third embodiment also provides the same effects as the second embodiment. Further, in the third embodiment, when manufacturing the seal member 40 by rubber molding using a mold or the like, the direction in which the convex surface 451 extends can be set as the draft direction in the rubber molding. This makes it relatively easy to manufacture the seal member 40, thereby improving the productivity of the seal member 40.

(Fourth embodiment)
In the fourth embodiment, the form of the seal member is different. Other than this, the second embodiment is the same as the first embodiment.

As shown in FIG. 14, the valve chamber side covering surface 412 of the seal member 40 includes a concave surface recessed on the opposite side from the valve rotation axis O. As shown in FIG. This concave surface is connected to the covering step surface 415, and a covering end portion 416 is formed as a boundary between this concave surface and the covering step surface 415.

In this case, an imaginary line Li, which is a straight line on the extension of the valve chamber side covering surface 412 in the cross section of the cylindrical portion 32 in the direction of the axis CL, passes through the covering end 416 and extends in the tangential direction to the concave surface of the valve chamber side covering surface 412. It is an extended straight line. The imaginary line Li is located closer to the valve rotation axis O than the first protrusion 42, that is, the first protrusion 42 is located on the opposite side of the valve rotation axis O with respect to the imaginary line Li. It is located in

In the fourth embodiment, as in the first embodiment, the vortex flowing along the virtual line Li is suppressed from colliding with the first protrusion 42. Noise is suppressed.

(Fifth embodiment)
In the fifth embodiment, the form of the valve member is different. Other than this, the second embodiment is the same as the first embodiment.

As shown in FIG. 15, when the valve member 20 rotates to close the valve seat flow path 31, the second protrusion 44 comes into contact with the second sealing surface 213 of the valve member 20, as described above. The gap between the protrusion 44 and the second sealing surface 213 is closed. Note that in FIG. 15, the upper side of the page is the cover 105 side of the housing 10. Further, in FIG. 15, the lower side of the page is the opposite side of the housing 10 from the cover 105. Further, hereinafter, for convenience, the direction of rotation of the valve member 20 when the valve member 20 closes the valve seat flow path 31 will be simply referred to as the direction of rotation of the valve member 20. Further, the direction perpendicular to the rotational direction of the valve member 20 and the direction of the axis CL of the cylindrical portion 32 is defined as a thrust direction.

At this time, as shown in FIG. 16, by arranging the second protrusion 44, a first space 481 is created between the cover 105 side of the second sealing surface 213 and the second side wall covering part 43. is formed. Further, in this first space 481, the cover 105 side of the second sealing surface 213 and the first covering surface 471 of the second side wall covering portion 43 face each other in the thrust direction.

Furthermore, at this time, as shown in FIG. 17, the first valve member surface 201 of the valve member 20 and the second covering surface 472 of the second side wall covering portion 43 face each other in the rotational direction of the valve member 20. Furthermore, a second space 482 is formed between the first valve member surface 201 and the second covering surface 472.

At this time, as shown in FIG. 18, since the second protrusion 44 is disposed, there is a gap between the second sealing surface 213 on the side opposite to the cover 105 and the second side wall covering section 43. 3 spaces 483 are formed. Further, in this third space 483, the side of the second sealing surface 213 opposite to the cover 105 and the third covering surface 473 of the second side wall covering portion 43 face each other in the thrust direction.

Furthermore, at this time, as shown in FIG. 19, the second valve member surface 202 of the valve member 20 and the fourth covering surface 474 of the second side wall covering portion 43 face each other in the rotational direction of the valve member 20. Furthermore, a fourth space 484 is formed between the second valve member surface 202 and the fourth covering surface 474.

Further, here, as shown in FIGS. 15 to 19, the valve member 20 includes an exposed surface 500, a first valve member recess 510, a second valve member recess 520, a third valve member recess 530, and a fourth valve member recess. 540.

The exposed surface 500 is exposed on the EGR passage 950 side of the valve member 20 when the valve member 20 closes the valve seat passage 31. Further, as shown in FIGS. 16 and 18, the boundary between the exposed surface 500 and the second sealing surface 213 has an R shape. Further, as shown in FIG. 17, the boundary between the exposed surface 500 and the first valve member surface 201 is rounded. Further, as shown in FIG. 19, the boundary between the exposed surface 500 and the second valve member surface 202 has an R shape.

The first valve member recess 510 is formed on the cover 105 side of the valve member 20, as shown in FIG. Further, the first valve member recess 510 is recessed from the exposed surface 500 toward the valve rotation axis O side, as shown in FIG. Further, the first valve member recess 510 includes a first recess bottom surface 511 and a first recess side surface 512.

The first recess bottom surface 511 extends in the rotational direction of the valve member 20, as shown in FIG.

The first recess side surface 512 is connected to the exposed surface 500 and the first recess bottom surface 511, as shown in FIG. Further, the first recess side surface 512 extends from the exposed surface 500 toward the valve rotation axis O side, and is parallel to the first covered surface 471. Furthermore, the first recess side surface 512 faces in the same direction as the first covering surface 471 and is exposed. Here, the first recess side surface 512 and the first covering surface 471 are exposed facing one side in the thrust direction. Further, here, the second sealing surface 213 and the first covering surface 471 are located on the first perpendicular line Lp1 to the first recess side surface 512. Furthermore, the boundary between the first recess side surface 512 and the exposed surface 500 is rounded. Further, the boundary between the first recess side surface 512 and the first recess bottom surface 511 is rounded.

The second valve member recess 520 is connected to the first valve member recess 510, as shown in FIG. 15, and is here integrated with the first valve member recess 510. Furthermore, as shown in FIG. 17, the second valve member recess 520 is recessed from the exposed surface 500 of the valve member 20 toward the valve rotation axis O side. Further, the second valve member recess 520 includes a second recess bottom surface 521 and a second recess side surface 522.

As shown in FIG. 15, the second recess bottom surface 521 is connected to the first recess bottom surface 511 and extends in the thrust direction.

The second recess side surface 522 is connected to the first recess side surface 512. Further, the second recess side surface 522 is connected to the exposed surface 500 and the second recess bottom surface 521, as shown in FIG. Further, the second recess side surface 522 extends from the exposed surface 500 toward the valve rotation axis O side, and is parallel to the second covered surface 472. Further, the second recess side surface 522 faces in the same direction as the second covering surface 472 and is exposed. Here, the second recess side surface 522 and the second covering surface 472 are exposed toward one side in the rotational direction of the valve member 20. Furthermore, here, the first valve member surface 201 and the second covering surface 472 are located on the second perpendicular Lp2 to the second recess side surface 522. Further, the boundary between the second recess side surface 522 and the exposed surface 500 is rounded. Furthermore, the boundary between the second recess side surface 522 and the second recess bottom surface 521 is rounded.

The third valve member recess 530 is formed on the side of the valve member 20 opposite to the cover 105, as shown in FIG. Further, the third valve member recess 530 is recessed from the exposed surface 500 toward the valve rotation axis O side, as shown in FIG. Further, the third valve member recess 530 includes a third recess bottom surface 531 and a third recess side surface 532.

The third recess bottom surface 531 extends in the rotational direction of the valve member 20, as shown in FIG.

The third recess side surface 532 is connected to the exposed surface 500 and the third recess bottom surface 531, as shown in FIG. Further, the third recess side surface 532 extends from the exposed surface 500 toward the valve rotation axis O side, and is parallel to the third covering surface 473. Furthermore, the third recess side surface 532 faces in the same direction as the third covering surface 473 and is exposed. Here, the third recess side surface 532 and the third covering surface 473 are exposed facing one side in the thrust direction. Further, here, the second sealing surface 213 and the third covering surface 473 are located on the third perpendicular line Lp3 to the third recess side surface 532. Furthermore, the boundary between the third recess side surface 532 and the exposed surface 500 is rounded. Further, the boundary between the third recess side surface 532 and the third recess bottom surface 531 is rounded.

The fourth valve member recess 540 is connected to the third valve member recess 530, as shown in FIG. 15, and is here integrated with the third valve member recess 530. Furthermore, as shown in FIG. 19, the fourth valve member recess 540 is recessed from the exposed surface 500 of the valve member 20 toward the valve rotation axis O side. Further, the fourth valve member recess 540 includes a fourth recess bottom surface 541 and a fourth recess side surface 542.

As shown in FIG. 15, the fourth recess bottom surface 541 is connected to the fourth recess bottom surface 541 and extends in the thrust direction.

The fourth recess side surface 542 is connected to the third recess side surface 532. Furthermore, the fourth recess side surface 542 is connected to the exposed surface 500 and the fourth recess bottom surface 541, as shown in FIG. Further, the fourth recess side surface 542 extends from the exposed surface 500 toward the valve rotation axis O side, and is parallel to the fourth covered surface 474. Further, the fourth recess side surface 542 faces in the same direction as the fourth covering surface 474 and is exposed. Here, the fourth recess side surface 542 and the fourth covering surface 474 are exposed toward one side in the rotational direction of the valve member 20. Furthermore, here, the second valve member surface 202 and the fourth covering surface 474 are located on the fourth perpendicular Lp4 to the fourth recess side surface 542. Further, the boundary between the fourth recess side surface 542 and the exposed surface 500 is rounded. Furthermore, the boundary between the fourth recess side surface 542 and the fourth recess bottom surface 541 is rounded.

The fifth embodiment is configured as described above. The fifth embodiment also provides the same effects as the first embodiment.

Furthermore, in the fifth embodiment, it is possible to improve the accuracy of the positional relationship between the valve member 20 and the seal member 40 when assembling the valve member 20 and the seal member 40 when manufacturing the valve device 1.

Here, in order to explain the improvement in the accuracy of the positional relationship between the valve member 20 and the seal member 40, terms will be defined as follows.

As shown in FIG. 16, the distance in the thrust direction from the second sealing surface 213 to the first covering surface 471 is defined as a first relative distance Dr1. Furthermore, the distance in the thrust direction from the first recess side surface 512 to the first covering surface 471 is defined as a first measurement distance Dm1. Further, as shown in FIG. 17, the distance in the rotational direction of the valve member 20 from the first valve member surface 201 to the second covering surface 472 is defined as a second relative distance Dr2. Furthermore, the distance in the rotational direction of the valve member 20 from the second recess side surface 522 to the second covering surface 472 is defined as a second measurement distance Dm2. Further, as shown in FIG. 18, the distance in the thrust direction from the second sealing surface 213 to the third covering surface 473 is defined as a third relative distance Dr3. Furthermore, the distance in the thrust direction from the third recess side surface 532 to the third covering surface 473 is defined as a third measurement distance Dm3. Further, as shown in FIG. 19, the distance in the rotational direction of the valve member 20 from the second valve member surface 202 to the fourth covering surface 474 is a fourth relative distance Dr4. Furthermore, the distance in the rotational direction of the valve member 20 from the fourth recess side surface 542 to the fourth covering surface 474 is defined as a fourth measurement distance Dm4. Further, the positional deviation in the thrust direction between the valve rotation axis O of the valve member 20 and the axis CL of the seal member 40 is defined as a thrust direction deviation ΔD. Furthermore, the positional deviation of the valve member 20 around the axis CL of the seal member 40 is defined as a rotational direction deviation Δθ.

Further, the thrust direction deviation ΔD is calculated based on the absolute value of the difference between the first relative distance Dr1 and the third relative distance Dr3, for example, as shown in relational expression (1) below. Note that the thrust direction deviation ΔD may be calculated based on the first relative distance Dr1, the outer diameter Do of the valve member 20, and the inner diameter Di of the valve seat member 30, as shown in relational expression (2) below. In this case, the outer diameter Do of the valve member 20 and the inner diameter Di of the valve seat member 30 are measured in advance, for example.

ΔD=|Dr1-Dr3|÷2...(1)
ΔD=|(Do-Di)÷2-Dr1| ...(2)

Further, the rotational direction deviation Δθ is determined by the absolute value of the difference between the second relative distance Dr2 and the fourth measurement distance Dm4 and the inner diameter Di of the valve seat member 30, for example, as shown in relational expression (3) below. Calculated based on Here, the unit of rotational direction deviation Δθ is radian. In this case, the inner diameter Di of the valve seat member 30 is a designed value because it is sufficiently large with respect to the variation in the inner diameter Di.

Δθ=sin ^-1 (|Dr2-Dr4|÷Di)...(3)

Therefore, the accuracy of the thrust direction deviation ΔD is improved by improving the accuracy of the first relative distance Dr1 and the third relative distance Dr3. Further, by improving the accuracy of the second relative distance Dr2 and the fourth measurement distance Dm4, the accuracy of the rotational direction deviation Δθ is improved.

Here, as shown in FIG. 20, as a comparative example, it is assumed that the distance from the first surface 801 to the second surface 802, which face each other, is measured using a laser or the like. In this case, when the end of the first surface 801 is chamfered in an R shape or the like, the distance from the R shape part of the first surface 801 to the flat part of the second surface 802 and the This is different from the distance from the flat part to the flat part of the second surface 802. Therefore, if the distance from the R-shaped part of the first surface 801 to the flat part of the second surface 802 is incorrectly measured by a laser or the like, the accuracy of the distance from the first surface 801 to the second surface 802 will decrease. .

The boundary between the exposed surface 500 and the cover 105 side of the second sealing surface 213 is rounded. For this reason, the measurement accuracy of the first relative distance Dr1, which is the distance in the thrust direction from the second sealing surface 213 to the first covering surface 471, may decrease. Similarly, the measurement accuracy of the second relative distance Dr2, which is the distance in the rotational direction of the valve member 20 from the first valve member surface 201 to the second covering surface 472, may decrease. Furthermore, the measurement accuracy of the third relative distance Dr3, which is the distance in the thrust direction from the third recess side surface 532 to the third covering surface 473, may decrease. Furthermore, the measurement accuracy of the fourth relative distance Dr4, which is the distance in the rotational direction of the valve member 20 from the second valve member surface 202 to the fourth covering surface 474, may decrease.

However, here the valve member 20 has a first valve member recess 510. Further, as shown in FIG. 16, the first recessed side surface 512 of the first valve member recessed portion 510 faces in the same direction as the first covering surface 471 that is parallel to the first recessed side surface 512 and is exposed. Thereby, since the surfaces can be captured by a laser or the like, it is possible to accurately measure the first measurement distance Dm1, which is the distance in the thrust direction from the first recess side surface 512 to the first covering surface 471. Therefore, for example, by subtracting the design value of the distance in the thrust direction from the first recess side surface 512 to the second sealing surface 213 from the first measuring distance Dm1, which has relatively high accuracy, the relatively accurate A high first relative distance Dr1 can be calculated. Therefore, the accuracy of the thrust direction deviation ΔD can be improved.

Similarly, the second recess side surface 522 is exposed in the same direction as the second covering surface 472 parallel to the second recess side surface 522 . Thereby, the second measurement distance Dm2 can be measured with high accuracy. Therefore, the accuracy of the second relative distance Dr2 can be improved, and the accuracy of the rotational direction deviation Δθ can be improved. Further, the third recess side surface 532 is exposed in the same direction as the third covering surface 473 parallel to the third recess side surface 532. Thereby, the third measurement distance Dm3 can be measured with high accuracy. Therefore, the accuracy of the third relative distance Dr3 can be improved, and the accuracy of the thrust direction deviation ΔD can be improved. Further, the fourth recess side surface 542 is exposed in the same direction as the fourth covering surface 474 parallel to the fourth recess side surface 542. Thereby, the fourth measurement distance Dm4 can be measured with high accuracy. Therefore, the accuracy of the fourth relative distance Dr4 can be improved, and the accuracy of the rotational direction deviation Δθ can be improved.

Therefore, it is possible to improve the accuracy of the thrust direction deviation ΔD and the rotational direction deviation Δθ, thereby improving the accuracy of the positional relationship between the valve member 20 and the seal member 40 when assembling the valve member 20 and the seal member 40. I can do it.

(Other embodiments)
The present disclosure is not limited to the embodiments described above, and the embodiments can be modified as appropriate. Furthermore, in each of the above embodiments, it goes without saying that the elements constituting the embodiments are not necessarily essential, except in cases where it is specifically stated that they are essential or where they are clearly considered essential in principle. stomach.

(1) In the above embodiment, the tube portion 32 is formed in a cylindrical shape. On the other hand, the cylindrical portion 32 is not limited to a cylindrical shape. The cylindrical portion 32 may be formed into a polygonal cylindrical shape, for example.

(2) In the second and third embodiments described above, the convex portion 45 is connected to the radially inner side of the cylindrical portion 32 of the valve chamber side covering surface 412. On the other hand, the convex portion 45 is not limited to being connected to the radially inner side of the cylindrical portion 32 of the valve chamber side covering surface 412, but may be connected to the valve chamber side covering surface 412. For example, as shown in FIG. 21, the convex portion 45 may be connected to the radially outer side of the cylindrical portion 32 on the valve chamber side covering surface 412. In this case, the covering step surface 415 and the valve chamber side covering surface 412 are separate bodies. Even in such a form, the same effects as described above can be achieved.

(3) In the second and third embodiments described above, the seal member 40 has one convex portion 45. The number of protrusions 45 of the seal member 40 is not limited to one, and may be plural. For example, as shown in FIG. 22, the sealing member 40 includes the first side wall covering portion 41, the first protrusion 42, the first valve chamber side covering portion 411, the second side wall covering portion 43, the second valve chamber side In addition to the covering portion 431 and the second protrusion 44, it has a first protrusion 701 and a second protrusion 702.

The first convex portion 701 is formed in the same manner as the convex portion 45 described above. Specifically, the first convex portion 701 includes a first convex surface 751 and a first convex end 753. Here, the first convex surface 751 corresponds to the above-described convex surface 451. Further, the first convex end portion 753 corresponds to the above-described convex end portion 453. The first convex surface 751 extends from the valve seat flow path 31 side to the opposite side of the valve seat flow path 31, and a straight line passing through the first convex end 753 is referred to as the first convex virtual line Lc1. do. The first convex virtual line Lc1 corresponds to the above-described convex virtual line Lc.

The second convex portion 702 is connected to the first convex surface 751. Further, the second convex portion 702 protrudes from the first convex surface 751 toward the valve rotation axis O side. Further, the second convex portion 702 includes a second convex surface 761 and a second convex end 763.

The second convex surface 761 corresponds to the covering surface, is formed flat, and faces toward the valve rotation axis O side.

Further, here, the covering stepped surface 415 is formed in a stepped shape with the valve chamber side covering surface 412 and the first convex surface 751, and is connected to the second convex surface 761. Furthermore, the surface of the covered step surface 415 that is connected to the second convex surface 761 intersects with the second convex surface 761 . Therefore, due to the covered step surface 415, a step is formed between the second convex surface 761 and the first protrusion 42.

The second convex end 763 corresponds to the covering end and is the boundary between the second convex surface 761 and the covering step surface 415. In addition, here, since the surface of the covering step surface 415 that is connected to the second convex surface 761 intersects with the second convex surface 761, the second convex end portion 763 is This is a corner formed by the stepped surface 415 and the second convex surface 761.

Here, in a cross section cut in the direction of the axis CL of the cylinder part 32 including the axis CL of the cylinder part 32, from the valve seat flow path 31 side of the second convex surface 761 to the side opposite to the valve seat flow path 31. A straight line that extends in the direction along the second convex end 763 and passes through the second convex end 763 is defined as a second convex virtual line Lc2. Here, the second convex virtual line Lc2 is located closer to the valve rotation axis O than the first protrusion 42. That is, the first protruding portion 42 is opposite to the valve rotation axis O with the second convex portion imaginary line Lc2 as a reference in a cross section taken in the direction of the axis CL of the tube portion 32 and including the axis CL of the tube portion 32. Located on the side.

Even in such a form, the same effects as in the second embodiment can be achieved. In addition, in such a form, the 1st protrusion part 42 may be located on the 1st convex part virtual line Lc1.

(4) In the second and third embodiments described above, the convex surface 451 of the convex portion 45 of the seal member 40 is formed into a flat surface. On the other hand, the convex surface 451 is not limited to being a flat surface, and the convex surface 451 may include a concave surface concave on the side opposite to the valve rotation axis O, as in the fourth embodiment.

(5) In the fourth embodiment, the first valve member recess 510 and the second valve member recess 520 are integrally formed. Further, the third valve member recess 530 and the fourth valve member recess 540 are integrally formed. On the other hand, as shown in FIG. 23, the first valve member recess 510 and the second valve member recess 520 may be formed separately. Moreover, the third valve member recess 530 and the fourth valve member recess 540 may be formed separately. Even in such a form, the same effects as described above can be achieved.

(6) In the fourth embodiment, the second valve member recess 520 and the fourth valve member recess 540 are formed. On the other hand, the second valve member recess 520 and the fourth valve member recess 540 may not be formed.

For example, as shown in FIG. 24, the first valve member recess 510 has a first measurement surface 513 in addition to the recess bottom surface 511 and recess side surface 512 described above. The first measurement surface 513 is connected to the recess bottom surface 511 and the recess side surface 512, and is exposed in the same direction as the covering surface 472. As a result, the surfaces can be captured by a laser or the like, so instead of the second measurement distance Dm2 described above, the distance in the rotational direction of the valve member 20 from the first measurement surface 513 to the covering surface 472 can be determined with high accuracy. can be measured. Therefore, the accuracy of the second relative distance Dr2 can be improved, and therefore the accuracy of the rotational direction deviation Δθ can be improved. Therefore, the same effects as above are achieved.

Further, the third valve member recess 530 has a second measurement surface 533 in addition to the recess bottom surface 531 and the recess side surface 532 described above. The second measurement surface 533 is connected to the recess bottom surface 531 and the recess side surface 532, and is exposed in the same direction as the covering surface 474. Thereby, similarly to the above, instead of the above-mentioned fourth measurement distance Dm4, the distance in the rotational direction of the valve member 20 from the second measurement surface 533 to the covering surface 474 can be measured with high accuracy. Therefore, the accuracy of the fourth relative distance Dr4 can be improved, and therefore the same effect as described above can be achieved.

1 Valve device 10 Housing 11 Valve chamber 14 Accommodation space 20 Valve member 30 Valve seat member 31 Valve seat flow path 40 Seal member 41 Side wall covering portion 42 Projection portion

Claims (3)

A valve device,
a housing (10) having a valve chamber (11) and a housing space (14) communicating with the valve chamber;
a cylindrical portion (32) including a valve seat flow path (31) communicating with the valve chamber and through which fluid flows from the side opposite to the valve chamber; and a sealing member (40) covering the cylindrical portion; a valve seat member (30) disposed in the space;
a valve member (20) that is housed in the valve chamber and opens and closes the valve seat flow path by rotating around the rotation axis (O);
Equipped with
The seal member includes a side wall covering portion (41) that covers the side of the cylinder portion opposite to the valve seat flow path, and a protruding portion (42) that projects from the side wall covering portion toward the outside of the seal member. and a valve chamber side covering part (411) that covers an end of the cylinder part on the rotating shaft side,
The valve member rotates around the rotation axis and comes into contact with the protrusion, thereby closing a gap between the valve member and the sealing member and closing the valve seat flow path;
The valve chamber side covering portion includes a covering surface (412, 451, 761) facing the rotating shaft side, and a covering step surface (415) that intersects the covering surface and is connected to the covering surface and the protrusion. ), and a covering end (416, 453, 763) that is a boundary between the covering surface and the covering step surface,
The protruding portion is based on a straight line (Li, Lc, Lc2) extending in a direction along the covering surface in a cross section taken in the axial direction of the cylindrical portion including the axis (CL) of the cylindrical portion. located on the opposite side of the rotation axis ,
The valve chamber side covering portion includes a convex portion (45) protruding in a direction toward the rotating shaft side,
The covered step surface is formed in a step shape,
A valve device in which the convex portion includes the covered surface (451) and the covered end . A valve device,
a housing (10) having a valve chamber (11) and a housing space (14) communicating with the valve chamber;
a cylindrical portion (32) including a valve seat flow path (31) communicating with the valve chamber and through which fluid flows from the side opposite to the valve chamber; and a sealing member (40) covering the cylindrical portion; a valve seat member (30) disposed in the space;
a valve member (20) that is housed in the valve chamber and opens and closes the valve seat flow path by rotating around the rotation axis (O);
Equipped with
The seal member includes a side wall covering portion (41) that covers the side of the cylinder portion opposite to the valve seat flow path, and a protruding portion (42) that projects from the side wall covering portion toward the outside of the seal member. and a valve chamber side covering part (411) that covers an end of the cylinder part on the rotating shaft side,
The valve member rotates around the rotation axis and comes into contact with the protrusion, thereby closing a gap between the valve member and the sealing member and closing the valve seat flow path;
The valve chamber side covering portion includes a covering surface (412, 451, 761) facing the rotating shaft side, and a covering step surface (415) that intersects the covering surface and is connected to the covering surface and the protrusion. ), and a covering end (416, 453, 763) that is a boundary between the covering surface and the covering step surface,
The protruding portion is based on a straight line (Li, Lc, Lc2) extending in a direction along the covering surface in a cross section taken in the axial direction of the cylindrical portion including the axis (CL) of the cylindrical portion. located on the opposite side of the rotation axis,
In the valve device, the fluid that has flowed through the valve seat flow path flows in a direction along the covering surface from the valve seat flow path side to a side opposite to the valve seat flow path. The valve chamber side covering portion includes a convex portion (45) protruding in a direction toward the rotating shaft side,
The covered step surface is formed in a step shape,
The valve device according to claim 2 , wherein the convex portion includes the covering surface (451) and the covering end.

Images