JP6872171B2 - Valve structure - Google Patents

Description

The present invention relates to a valve structure.

Patent Document 1 describes an exhaust brake valve. This exhaust brake valve is provided with a bearing portion and a seal portion on the bush of the housing. A plurality of seal rings are arranged on the outer periphery of the valve shaft in the seal portion to form a labyrinth seal. The labyrinth seal is configured by alternately arranging a thick seal ring having a larger diameter and a thin seal ring having a smaller diameter. The thick seal ring is sized so that there is a large gap between its inner circumference and the outer circumference of the valve shaft, and a small gap is formed between the outer peripheral surface and the inner peripheral surface of the bush seal portion. There is. The thin-walled seal ring is sized so that its inner peripheral surface forms a small gap with the outer peripheral surface of the valve shaft.

Patent Document 2 describes a sealing structure for sealing between a valve box and a valve lid. In this seal structure, a soft seal ring made of non-metal formed by asbestos fiber braid or expanded graphite and a spacer ring are arranged in a ring accommodating portion between the valve box and the valve lid. In order to form the ring accommodating portion, a pressure tapered surface is formed on the outer peripheral surface of the valve lid so as to reduce the diameter in the direction in which the fluid pressure is applied, and above the pressure tapered surface is parallel to the axial direction. A surface to be sealed is formed. Further, a surface to be sealed parallel to the axial direction is formed on the inner peripheral surface of the valve box. The soft seal ring has an inner sealing surface in contact with the sealed surface of the valve lid, an outer sealing surface in contact with the sealed surface of the valve box, and a pressure receiving inclined surface (tapered surface) in contact with the pressure tapered surface of the valve lid. .. The spacer ring is arranged above the soft seal ring, the inner peripheral surface of the spacer ring and the inner seal surface of the seal ring are flush with each other, and the outer peripheral surface of the spacer ring and the outer seal surface of the seal ring are also flush with each other. ..

Japanese Unexamined Patent Publication No. 11-166428 Japanese Unexamined Patent Publication No. 2004-332780

As described in Patent Document 1, in the labyrinth seal, since the seal ring having a large diameter and the seal ring having a small diameter are alternately arranged, the valve shaft (shaft) with respect to the bush can be moved in the radial direction. However, the seal ring having a larger diameter has a large gap between its inner circumference and the outer circumference of the shaft, and a small gap between its outer peripheral surface and the inner peripheral surface of the bush. Further, the seal ring having a smaller diameter has a small gap between the inner circumference thereof and the outer circumference of the shaft. Therefore, the exhaust gas (fluid) may flow out from the gap between the bush and the seal ring, the gap between the shaft and the seal ring, and the like. In order to prevent the outflow of fluid from the gap between the bush and the shaft, it is conceivable to apply the seal structure described in Document 2 above between the bush and the shaft. However, if a seal ring and a spacer ring having a seal structure described in Document 2 above are provided between the shaft and the bush, the spacer ring may hinder the movement of the shaft in the radial direction with respect to the bush. There is a risk of damaging the shaft or making it difficult for the shaft to rotate. Further, when a large pressure in the radial direction is applied to the soft seal ring such as expanded graphite between the shaft and the bush due to the movement of the shaft in the radial direction with respect to the bush or the thermal expansion of the shaft, the soft seal ring is damaged. Therefore, there is a risk that the fluid will flow out.

Therefore, an object of the present invention is to provide a valve structure capable of allowing the shaft to move in the radial direction with respect to the bush and suppressing the outflow of fluid.

In order to solve the above problems, the first aspect of the present invention is a valve structure in which an on-off valve is provided in a housing, which includes a bush, a shaft, a holding member, an annular seal ring, and an annular contact ring. .. The bush has a small-diameter inner peripheral surface extending along a predetermined axial direction, a large-diameter inner peripheral surface having a larger diameter than the small-diameter inner peripheral surface and extending along the axial direction, and a small-diameter inner peripheral surface intersecting the axial direction. It has an annular intermediate surface that connects to the large-diameter inner peripheral surface, and is fixed to the housing in a state where the large-diameter inner peripheral surface is arranged on the outer side of the housing with respect to the small-diameter inner peripheral surface. The small-diameter inner peripheral surface, intermediate surface, and large-diameter inner peripheral surface of the bush partition the shaft insertion hole. The shaft has a supported outer peripheral surface supported by the small-diameter inner peripheral surface of the bush and a sealed outer peripheral surface arranged at a position facing the large-diameter inner peripheral surface of the bush, and a state in which the shaft insertion hole is inserted. It extends along the axial direction and is rotatably supported by the bush and fixed to the on-off valve. The holding member has a protruding facing surface that protrudes inward in the radial direction from the large-diameter inner peripheral surface of the bush on the outer side of the bush and is arranged at a position facing the intermediate surface of the bush, and is supported by the bush side. To. The annular seal ring has an inner peripheral surface of the seal that extends along the axial direction and abuts on the outer peripheral surface of the shaft to be sealed, and a radial outer surface that is inclined with respect to the axial direction from one side to the other in the axial direction. It has a tapered inclined outer peripheral surface that expands in diameter and a first thrust surface that is arranged at the other end and intersects the axial direction, and the outer end in the radial direction is from the large-diameter inner peripheral surface of the bush. It is arranged at a position separated inward in the radial direction and is supported on the bush side. The seal ring is made of expanded graphite. The annular contact ring is arranged at a position radially inwardly separated from the large-diameter inner peripheral surface of the bush and extends along the axial direction, and the outer peripheral surface is inclined with respect to the axial direction and is the other side in the axial direction. It has a tapered inner peripheral surface that is tapered inward in the radial direction toward one side, and a second thrust surface that is arranged at the end of the one side and intersects the axial direction. The peripheral surface is supported on the bush side in a state of being in contact with the inclined outer peripheral surface of the seal ring. The first thrust surface of the seal ring abuts on one of the intermediate surface of the bush or the protruding facing surface of the holding member. The second thrust surface of the abutment ring is supported from the intermediate surface of the bush or the other surface side of the projecting facing surface of the holding member.

In the above configuration, the first thrust surface of the seal ring abuts on one of the intermediate surface of the bush or the protruding facing surface of the holding member, and the second thrust surface of the abutting ring is the intermediate surface of the bush. Alternatively, it is supported from the other surface side of the protruding facing surfaces of the holding member. That is, the axial movement of the seal ring and the contact ring is regulated by the intermediate surface of the bush and the protruding facing surface of the holding member. In this way, in a state where the axial movement of the seal ring and the contact ring is restricted, the inclined inner peripheral surface of the contact ring inclined with respect to the axial direction and the inclined outer peripheral surface of the seal ring come into contact with each other. Since the inner peripheral surface of the seal ring and the outer peripheral surface of the shaft to be sealed come into contact with each other, it is possible to suppress the outflow of fluid along the outer peripheral surface of the shaft from the inside of the housing to the outside.

In addition, since the seal ring is made of expanded graphite and has elasticity compared to metal, the inner peripheral surface of the seal ring is in contact with the outer peripheral surface of the shaft to be sealed while the seal ring is compressed in the axial direction. It is possible to make contact with each other and secure a surface pressure capable of suppressing the outflow of fluid. Further, since the seal ring is made of expanded graphite, it has high heat resistance and is not easily deteriorated by heat, so that the wear resistance of the seal ring can be ensured.

Further, the outer end in the radial direction of the seal ring is arranged at a position radially inward from the large-diameter inner peripheral surface of the bush, and the outer peripheral surface of the contact ring is radially inward from the large-diameter inner peripheral surface of the bush. It is placed at a distance. That is, a tubular space (hereinafter referred to as a tubular space) is partitioned between the seal ring and the contact ring and the large-diameter inner peripheral surface of the bush. Therefore, it is possible to allow the shaft to move in the radial direction with respect to the bush. Further, when the shaft moves in the radial direction with respect to the bush, the seal ring and the contact ring can be moved following the movement of the shaft, so that the member to be sealed (the shaft, the bush, and the holding member) are included. ), The shaft can be allowed to move in the radial direction with respect to the bush while the surface pressure of the seal ring is secured, and the outflow of fluid can be suppressed.

Further, when the shaft moves in the radial direction with respect to the bush, the seal ring and the contact ring can be moved following the movement of the shaft, so that the pressure applied to the expanded graphite seal ring can be suppressed to seal. It is possible to prevent the ring from being damaged.

Further, when the first thrust surface of the seal ring is brought into contact with the intermediate surface of the bush, the outflow of fluid from between the first thrust surface of the seal ring and the intermediate surface of the bush can be suppressed. Further, when the first thrust surface of the seal ring is brought into contact with the protruding facing surface of the holding member, the fluid flows into the tubular space by making the protruding facing surface of the holding member an annular protruding facing surface. At that time, the outflow of fluid from between the first thrust surface of the seal ring and the projecting facing surface of the holding member can be suppressed. As described above, since the outflow of the fluid is suppressed not only by the inner peripheral surface of the seal of the seal ring but also by the first thrust surface, the outflow of the fluid can be effectively suppressed.

Therefore, it is possible to allow the shaft to move in the radial direction with respect to the bush and suppress the outflow of the fluid.

The valve structure of the second aspect of the present invention is the valve structure of the first aspect and includes an urging member. The urging member is arranged between the second thrust surface of the abutting ring and the other surface, and presses the second thrust surface from the other surface side to urge the abutting ring. The second thrust surface of the abutting ring is supported from the other surface side via the urging member.

In the above configuration, the urging member arranged between the other surface (intermediate surface of the bush or the projecting facing surface of the holding member) and the second thrust surface of the abutting ring is formed from the other surface side. Press the thrust surface of 2 to urge the contact ring. That is, since the urging member urges the abutting ring toward the seal ring side in the axial direction, the seal ring is compressed in the axial direction between the inner peripheral surface of the seal of the seal ring and the outer peripheral surface of the shaft to be sealed. It is possible to secure the surface pressure and the surface pressure between the first thrust surface of the seal ring and one of the above surfaces (the intermediate surface of the bush or the protruding facing surface of the holding member), and it is possible to suppress the outflow of fluid. it can.

The valve structure of the third aspect of the present invention is the valve structure of the first aspect or the second aspect, and includes an annular washer that is harder than expanded graphite. The seal ring has an annular notch in which the corners of the first thrust surface and the inner peripheral surface of the seal are notched. The washer has a washer inner peripheral surface having substantially the same diameter as the seal inner peripheral surface of the seal ring and a washer surface substantially on the same plane as the first thrust surface of the seal ring, and is arranged in the notch of the seal ring. ..

In the above configuration, the seal ring has an annular notch in which the corners of the first thrust surface and the inner peripheral surface of the seal are notched, and a washer is arranged in the notch. As described above, since the washer harder than the expanded graphite is provided on the first thrust surface side (thick wall side) of the seal ring, it is possible to prevent the seal ring from losing its shape on the thick wall side.

Further, since the washer is provided on the inner peripheral surface side of the seal on the first thrust surface of the seal ring, it is possible to prevent the first thrust surface of the seal ring from being damaged on the inner peripheral surface side of the seal, and the first seal ring can be used. It is possible to prevent the generation of seal ring fragments from the corner side between the thrust surface and the inner peripheral surface of the seal. Therefore, it is possible to prevent the seal ring fragment from entering between the outer peripheral surface of the shaft to be sealed and the inner peripheral surface of the seal ring from the corner side of the seal ring, and the rotation of the shaft due to the seal ring fragment is prevented. Inhibition can be prevented.

The valve structure according to the fourth aspect of the present invention is the valve structure according to any one of the first aspect to the third aspect, and is the inner peripheral surface of the seal and the inclined outer circumference in the cross section of the seal ring along the axial direction. The angle between the faces is less than 45 degrees.

In the above configuration, since the angle between the seal inner peripheral surface and the inclined outer peripheral surface in the cross section of the seal ring along the axial direction is smaller than 45 degrees, the axial force from the second thrust surface side of the abutting ring. Is input, and when the force from the abutment ring is input from the inclined inner peripheral surface of the abutment ring to the inclined outer peripheral surface of the seal ring, the inside of the seal is more than the component force to the first thrust surface side of the seal ring. The component force on the peripheral surface side can be increased. Therefore, sufficient surface pressure is secured between the inner peripheral surface of the seal ring and the outer peripheral surface of the shaft to be sealed, and the fluid from between the inner peripheral surface of the seal of the seal ring and the outer peripheral surface of the shaft to be sealed. The outflow of water can be suitably suppressed.

According to the present invention, it is possible to allow the shaft to move in the radial direction with respect to the bush and suppress the outflow of fluid.

It is a schematic block diagram of the exhaust brake device to which the valve structure which concerns on 1st Embodiment of this invention is applied. It is a schematic partial sectional view of the valve mechanism of the exhaust brake device of FIG. It is an enlarged view of the main part of FIG. It is an external perspective view of a seal ring. It is an external perspective view of a color. It is a partial cross-sectional view of the main part of the valve structure which concerns on 2nd Embodiment of this invention. It is an external view of a wave washer, (a) shows a state seen from a thrust direction, and (b) shows a state seen from a radial direction. It is a partial cross-sectional view of the main part of the valve structure which concerns on 3rd Embodiment of this invention. It is an external perspective view of a seal ring, (a) shows a state seen from a small diameter side, and (b) shows a state seen from a large diameter side.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In each figure, the alternate long and short dash line CL indicates the axis of rotation of the shaft 13.

As shown in FIG. 1, the exhaust brake device 1 to which the valve structure 10 according to the present embodiment is applied has a link or the like to a butterfly valve (open / close valve) 11 capable of opening / closing the flow path of the exhaust pipe (housing) 3 of the engine 2. An air cylinder 4 connected by an air cylinder 4, an air tank 6 that supplies working air to the air cylinder 4 via a supply pipe 5, an electromagnetic valve 7 that controls the supply of working air from the air tank 6 to the air cylinder 4, and an accelerator sensor. It is provided with an electronic control unit 8 that switches ON / OFF of the solenoid valve 7 according to an input signal from (not shown) or an exhaust brake switch (not shown). When the electronic control unit 8 turns on the solenoid valve 7, operating air is supplied from the air tank 6 to the air cylinder 4, the butterfly valve 11 closes, the exhaust flow in the exhaust pipe 3 is cut off, and the exhaust brake operates. .. On the other hand, when the electronic control unit 8 turns off the solenoid valve 7, working air is discharged from the exhaust port (not shown) of the solenoid valve 7, and the butterfly valve 11 is moved by the urging force of the spring (not shown) in the air cylinder 4. The valve is opened and the exhaust brake is released.

As shown in FIGS. 2 and 3, the valve structure 10 includes a bush 12, a shaft 13, a cover (holding member) 14, a seal ring 15, and a collar (contact ring) 16 and projects to the outside of the exhaust pipe 3. It is applied to one end side of the shaft 13. Boss portions 3a and 3b are formed in the exhaust pipe 3 at positions facing each other, and through holes 9a and 9b are formed in the boss portions 3a and 3b, respectively. The bushes 12 and 17 are fixed to the through holes 9a and 9b of the boss portions 3a and 3b of the exhaust pipe 3 in a fitted state. The bushes 12 and 17 have shaft insertion holes 12a and 17a arranged coaxially with each other, respectively. The shaft 13 is arranged so as to pass through the shaft insertion holes 12a and 17a of the bushes 12 and 17 and cross the flow path of the exhaust pipe 3, and both end sides of the shaft 13 are rotatably supported by the bushes 12 and 17. A butterfly valve 11 capable of blocking the flow of exhaust gas in the exhaust pipe 3 is fixed in a region of the shaft 13 in the flow path of the exhaust pipe 3. One end of the shaft 13 protrudes from the bush 12 to the outside of the exhaust pipe 3, and the other end of the shaft 13 is supported by the bush 17 and does not protrude to the outside of the exhaust pipe 3. A lever 9 connected to an air cylinder 4 is fixed to one end of a shaft 13 projecting to the outside of the exhaust pipe 3. That is, the air cylinder 4 rotates the shaft 13 via the lever 9, thereby opening and closing the butterfly valve 11.

The bush 12 is a metal member that supports the shaft 13, and has a shaft insertion hole 12a penetrating along the axial direction of the shaft 13 (a predetermined axial direction, hereinafter simply referred to as an axial direction) and a shaft insertion hole. It has a circular outer end opening 21 that opens 12a to the outer side of the exhaust pipe 3 (hereinafter, referred to as the outer side in the axial direction, or simply the outer side). The shaft insertion hole 12a is a large-diameter inner peripheral surface 19 extending in the axial direction continuously from the outer end opening 21 to the inner side of the exhaust pipe 3 (hereinafter, simply referred to as the inner side in the axial direction or simply the inner side). An annular ring that connects the small-diameter inner peripheral surface 18 arranged on the inner side in the axial direction with respect to the large-diameter inner peripheral surface 19 and extending along the axial direction, and the small-diameter inner peripheral surface 18 and the large-diameter inner peripheral surface 19. It is partitioned by the intermediate surface 20. The large-diameter inner peripheral surface 19 is provided at the end of the shaft insertion hole 12a on the outer side in the axial direction, is formed with a predetermined diameter R1, and extends along the axial direction with the same diameter (R1). The intermediate surface 20 is an annular surface that intersects the axial direction and faces the outer side, and has an outer diameter of the same diameter R1 as the large diameter inner peripheral surface 19 and an inner diameter of the same diameter R2 as the small diameter inner peripheral surface 18. is there. The outer peripheral edge of the intermediate surface 20 is continuous with the axially inner edge of the large-diameter inner peripheral surface 19, and the inner peripheral edge is continuous with the axially outer edge of the small-diameter inner peripheral surface 18. The small diameter inner peripheral surface 18 is formed with a diameter R2 slightly larger than the diameter of the shaft 13, and extends continuously from the inner peripheral edge of the intermediate surface 20 toward the inner side in the axial direction with the same diameter (R2).

The shaft 13 is a metal substantially rod body for opening and closing the butterfly valve 11, is fixed to the butterfly valve 11 and is rotatably supported on the exhaust pipe 3 side (bushes 12 and 17). Of the shaft 13, one end side (the side protruding outward) supported by the bush 12 through the shaft insertion hole 12a of the bush 12 has a diameter slightly smaller than the diameter R2 of the small diameter inner peripheral surface 18 of the bush 12. It is formed in a columnar shape and extends linearly along the axial direction. The shaft 13 is located at a position facing the supported outer peripheral surface 22 supported by the small-diameter inner peripheral surface 18 of the bush 12 and the large-diameter inner peripheral surface 19 of the bush 12 in a state where the shaft insertion hole 12a of the bush 12 is inserted. It has an outer peripheral surface 23 to be sealed to be arranged. With the shaft 13 inserted through the shaft insertion hole 12a of the bush 12, one of the shaft insertion holes 12a is located between the outer peripheral surface 23 to be sealed of the shaft 13 and the large-diameter inner peripheral surface 19 of the bush 12 and the intermediate surface 20. The tubular seal space 24, which is the area of the portion, is partitioned. The seal space 24 is opened to the outside by the outer end opening 21 of the bush 12, and the seal ring 15 and the collar 16 are arranged inside the seal space 24 as described later.

The cover 14 has an annular projecting plate portion 25 projecting inward in the radial direction from the outer end opening 21 on the outer side of the bush 12, and a seal ring described later is provided in the seal space 24 between the shaft 13 and the bush 12. After arranging the 15 and the collar 16, they are fixed to the exhaust pipe 3 and the bush 12. That is, the cover 14 is supported on the bush 12 side. The inner diameter R3 of the annular protruding plate portion 25 is larger than the diameter R2 of the small diameter inner peripheral surface 18 of the bush 12 and smaller than the diameter R1 of the large diameter inner peripheral surface 19 of the bush 12. That is, the protruding plate portion 25 of the cover 14 protrudes inward in the radial direction from the large-diameter inner peripheral surface 19 of the bush 12 on the outer side of the bush 12, and creates a sealing space 24 between the shaft 13 and the bush 12. Cover from the outside in the axial direction. The protruding plate portion 25 has a cover inner surface (projecting facing surface) 26 arranged at a position facing the intermediate surface 20 of the bush 12. In a state where the cover 14 is fixed to the bush 12 side (the state shown in FIG. 3, hereinafter referred to as the cover fixed state), the cover inner surface 26 of the projecting plate portion 25 is a seal space 24 between the shaft 13 and the bush 12. An opening is formed between the inner peripheral edge of the protruding plate portion 25 and the outer peripheral surface of the shaft 13 to partition the outer side and open the seal space 24 to the outer side. In the present invention, being supported on the bush 12 side means that it is supported not on the rotating side (shaft 13 side) but on the non-rotating side (bush 12 side).

As shown in FIGS. 3 and 4, the seal ring 15 is formed by compressing a sheet made of expanded graphite into a predetermined shape (in this embodiment, a cylindrical shape wound around a predetermined shaft). The annular member is arranged in the seal space 24 between the shaft 13 and the bush 12. The seal ring 15 is formed in a substantially tubular shape, its inner diameter is formed to be substantially the same as the diameter R2 of the small diameter inner peripheral surface 18 of the bush 12, and the outer diameter is the diameter R1 of the large diameter inner peripheral surface 19 of the bush 12. Formed smaller than. The seal ring 15 has a seal inner peripheral surface 27, an inclined outer peripheral surface 28, a non-inclined outer peripheral surface 30, and an internal contact surface (first thrust surface) 29. The seal inner peripheral surface 27 is the inner peripheral surface of the seal ring 15, and the seal ring 15 is arranged in the seal space 24 (the state shown in FIG. 3, hereinafter referred to as the seal ring mounting state). Extends along the axial direction from one end to the other end in the axial direction of the shaft 13 and abuts on the outer peripheral surface 23 to be sealed of the shaft 13. The inclined outer peripheral surface 28 is inclined with respect to the axial direction in the state where the seal ring is attached, and is radially outward from the outer edge (one side) of the seal inner peripheral surface 27 in the axial direction toward the inner side (the other side). It is formed in a tapered shape that expands in diameter. The axial length of the inclined outer peripheral surface 28 is shorter than the axial length of the seal inner peripheral surface 27. The axially inner edge of the inclined outer peripheral surface 28 is arranged at a position separated inward in the radial direction from the large-diameter inner peripheral surface 19 of the bush 12. The non-inclined outer peripheral surface 30 extends inward along the axial direction from the inner edge of the inclined outer peripheral surface 28 in the state where the seal ring is attached, and is separated inward from the large-diameter inner peripheral surface 19 of the bush 12. The tubular space 31 which is a part of the seal space 24 is partitioned between the large-diameter inner peripheral surface 19 and the large-diameter inner peripheral surface 19. That is, the radial outer end of the seal ring 15 is arranged at a position separated radially inward from the large-diameter inner peripheral surface 19 of the bush 12. The inner side contact surface 29 is an annular end surface on the inner side of the seal ring 15 in the state where the seal ring is attached, and intersects the axial direction with the inner edge of the seal inner peripheral surface 27 and the non-inclined outer peripheral surface. It connects with the inner edge of 30 and comes into contact with the intermediate surface 20 (one surface) of the bush 12. The seal ring 15 in the state where the seal ring is attached is supported on the bush 12 side by being pressed from the collar 16 side, which will be described later, toward the inner side in the axial direction. The cross section of the seal ring 15 along the axial direction is substantially trapezoidal, and the angle θ1 between the seal inner peripheral surface 27 and the inclined outer peripheral surface 28 in the cross section is set to approximately 30 degrees.

As shown in FIGS. 3 and 5, the collar 16 is an annular member made of metal, and is located on the outer side of the seal space 24 between the shaft 13 and the bush 12 in the axial direction with respect to the seal ring 15. Be placed. The collar 16 is formed in a substantially tubular shape, its inner diameter is formed to be substantially the same as the diameter R2 of the small diameter inner peripheral surface 18 of the bush 12, and the outer diameter is from the diameter R1 of the large diameter inner peripheral surface 19 of the bush 12. Is also formed small. The collar 16 has a collar outer peripheral surface (outer peripheral surface) 34, an inclined inner peripheral surface 33, a collar inner peripheral surface 32, and an outer side contact surface (second thrust surface) 35. The collar outer peripheral surface 34 is the outer peripheral surface of the collar 16 and is formed to have substantially the same diameter as the non-tilted outer peripheral surface 30 of the seal ring 15, and the collar 16 is arranged in the seal space 24 (the state shown in FIG. 3 below. In the collar-mounted state), the seal ring 15 extends continuously along the axial direction from the outer edge of the non-inclined outer peripheral surface 30 to the outer side. The collar outer peripheral surface 34 extends from one end to the other end in the axial direction of the collar 16 and is arranged at a position radially inward away from the large-diameter inner peripheral surface 19 of the bush 12 and faces the large-diameter inner peripheral surface 19. Then, a tubular space 36, which is a part of the seal space 24, is partitioned from the large-diameter inner peripheral surface 19. The tubular space 36 between the collar outer peripheral surface 34 and the large-diameter inner peripheral surface 19 of the bush 12 is a tubular space between the non-tilted outer peripheral surface 30 of the seal ring 15 and the large-diameter inner peripheral surface 19 of the bush 12. It is a space that continuously extends from 31 to the outside. The inclined inner peripheral surface 33 is inclined with respect to the axial direction in the state where the collar is attached, and the outer peripheral surface 34 of the collar is radially inward from the end edge on the inner side (the other side) in the axial direction toward the outer side (one side). It is formed in a tapered shape that reduces the diameter. The axial length of the inclined inner peripheral surface 33 is shorter than the axial length of the collar outer peripheral surface 34. The axially outer edge of the inclined inner peripheral surface 33 is arranged at substantially the same position as the axially outer edge of the seal inner peripheral surface 27 of the seal ring 15. The collar inner peripheral surface 32 is the inner peripheral surface of the collar 16 and is formed to have substantially the same diameter (R2) as the seal inner peripheral surface 27 of the seal ring 15. In the collar-mounted state, the axial direction of the inclined inner peripheral surface 33. It extends continuously along the axial direction from the outer edge of the shaft 13 to the outer side and abuts on the outer peripheral surface 23 to be sealed of the shaft 13. The outer contact surface 35 is an annular end surface on the outer side of the collar 16 in the collar-mounted state, and intersects the axial direction with the outer edge of the inner peripheral surface 32 of the collar and the outer surface of the outer peripheral surface 34 of the collar. It connects with the edge on the side and comes into contact with the inner surface 26 (the other surface) of the cover 14 of the cover 14. That is, the outer side contact surface 35 is directly supported by the protruding plate portion 25 of the cover 14 from the cover inner surface 26 side of the cover 14. The collar 16 in the collar-mounted state is arranged on the outer side in the axial direction of the seal ring 15, the inner peripheral surface 32 of the collar is continuous with substantially the same diameter as the inner peripheral surface 27 of the seal ring 15, and the outer peripheral surface 34 of the collar is sealed. It is continuous with the non-tilted outer peripheral surface 30 of the ring 15 with substantially the same diameter, and the inclined inner peripheral surface 33 abuts on the inclined outer peripheral surface 28 of the seal ring 15 in a state where pressure is applied from the outer side in the axial direction and the outer side in the radial direction. The cross section of the collar 16 along the axial direction is substantially trapezoidal, and the angle θ2 between the collar outer peripheral surface 34 and the inclined inner peripheral surface 33 in the cross section is set to approximately 30 degrees.

The radial length of the seal space 24 between the shaft 13 and the bush 12 (the radial distance between the outer peripheral surface 23 of the shaft 13 to be sealed and the large-diameter inner peripheral surface 19 of the bush 12) is the seal ring. It is set longer than the radial length of the 15 and the collar 16. That is, tubular spaces 31 and 36 are partitioned between the seal ring 15 and the collar 16 and the large-diameter inner peripheral surface 19 of the bush 12. The axial length of the seal space 24 (the axial distance between the inner surface 26 of the cover of the protruding plate portion 25 of the cover 14 and the intermediate surface 20 of the bush 12) is the inner side of the seal ring 15 in the state where the seal ring is attached. It is set to be the same as or slightly shorter than the axial length between the contact surface 29 and the outer contact surface 35 of the collar 16 in the collar-mounted state. The shape of the seal ring 15 is defined by a triangular space having a cross section (cross section along the axial direction) partitioned between the inclined inner peripheral surface 33 of the collar 16 in the collar-mounted state and the outer peripheral surface 23 of the shaft 13 to be sealed. The axial length of the seal ring 15 is set to at least the axial length of the space having a triangular cross section. With the seal ring 15 attached to the seal space 24 between the shaft 13 and the bush 12, and the collar 16 attached, the cover 14 is fixed to the exhaust pipe 3 and the bush 12, and the cover is fixed (see FIG. 3). Become. In the cover fixed state, the collar 16 and the seal ring 15 are supported on the bush 12 side by being sandwiched between the intermediate surface 20 of the bush 12 and the inner surface 26 of the cover of the projecting plate portion 25 of the cover 14.

In the valve structure 10 configured as described above, in the cover fixed state, the inner side contact surface 29 of the seal ring 15 comes into contact with the intermediate surface 20 of the bush 12, and the outer side contact surface 35 of the collar 16 is formed. It is supported from the cover inner surface 26 side of the cover 14. That is, in the cover fixed state, the collar 16 and the seal ring 15 are sandwiched between the intermediate surface 20 of the bush 12 and the inner surface 26 of the cover of the projecting plate portion 25 of the cover 14, and the seal ring 15 and the seal ring 15 are axially oriented. The movement of the bush 12 is regulated by the intermediate surface 20 of the bush 12 and the inner surface 26 of the cover of the projecting plate portion 25 of the cover 14. In this way, with the axial movement of the seal ring 15 and the collar 16 restricted, the inclined inner peripheral surface 33 of the collar 16 contacts the inclined outer peripheral surface 28 of the seal ring 15 with pressure applied. The inner peripheral surface 27 of the seal ring 15 comes into contact with the outer peripheral surface 23 of the shaft 13 under pressure. Therefore, it is possible to preferably seal between the inner peripheral surface 27 of the seal ring 15 and the outer peripheral surface 23 of the shaft 13 to be sealed, and the outer peripheral surface of the shaft 13 to be sealed from the inner side to the outer side of the exhaust pipe 3. The outflow of exhaust gas (fluid) along the surface 23 can be suppressed.

Further, in a state where the movement of the seal ring 15 and the collar 16 in the axial direction is restricted, the inclined inner peripheral surface 33 of the collar 16 comes into contact with the inclined outer peripheral surface 28 of the seal ring 15 in a state where pressure is applied. The internal contact surface 29 of the ring 15 contacts the intermediate surface 20 of the bush 12 with pressure applied. Therefore, the space between the internal contact surface 29 of the seal ring 15 and the intermediate surface 20 of the bush 12 can be suitably sealed, and the internal contact surface 29 of the seal ring 15 and the intermediate surface 20 of the bush 12 can be sealed. The outflow of exhaust gas from the space to the tubular spaces 31 and 36 can be suppressed. In this way, not only the inner peripheral surface 27 of the seal ring 15 but also the internal contact surface 29 suppresses the outflow of exhaust gas, so that the outflow of exhaust gas can be effectively suppressed.

Further, since the seal ring 15 is made of expanded graphite and has elasticity as compared with the metal, the pressure is applied to the inclined outer peripheral surface 28 of the seal ring 15 from the inclined inner peripheral surface 33 side of the collar 16. Suppresses exhaust outflow between the seal inner peripheral surface 27 of the seal ring 15 and the sealed outer peripheral surface 23 of the shaft 13 and between the inner side contact surface 29 of the seal ring 15 and the intermediate surface 20 of the bush 12. It is possible to secure a possible surface pressure. The surface pressure between the seal inner peripheral surface 27 of the seal ring 15 and the sealed outer peripheral surface 23 of the shaft 13 and between the inner side contact surface 29 of the seal ring 15 and the intermediate surface 20 of the bush 12 is determined. It can be set by the axial length of the seal ring 15 and the collar 16 before the cover 14 is attached to the axial length of the seal space 24.

Further, since the seal ring 15 is made of expanded graphite, it has high heat resistance and is not easily deteriorated by heat, so that the wear resistance of the seal ring 15 can be ensured.

Further, the seal ring 15 is compressed from a state in which a sheet made of expanded graphite is wound around a predetermined shaft (substantially coaxial with the axis CL of the rotation shaft of the shaft 13 in the state where the seal ring is attached) to form a cylindrical shape. Mold. That is, since the expanded graphite sheets are arranged in a laminated manner in the radial direction of the seal ring 15 and formed, the elasticity in the radial direction (radial direction) is higher than that in the axial direction (thrust direction). Therefore, the surface pressure between the seal inner peripheral surface 27 of the seal ring 15 and the sealed outer peripheral surface 23 of the shaft 13 is secured, and the seal inner peripheral surface 27 of the seal ring 15 and the sealed outer peripheral surface 23 of the shaft 13 are secured. Can be preferably sealed between and.

Further, in the cover fixed state, tubular spaces 31 and 36 are partitioned between the non-tilted outer peripheral surface 30 of the seal ring 15 and the collar outer peripheral surface 34 of the collar 16 and the large-diameter inner peripheral surface 19 of the bush 12. Therefore, it is possible to allow the shaft 13 to move in the radial direction with respect to the bush 12. Further, when the shaft 13 moves in the radial direction with respect to the bush 12, the seal ring 15 and the collar 16 can be moved following the movement of the shaft 13, so that the member to be sealed (in the present embodiment, the shaft). The movement of the shaft 13 with respect to the bush 12 in the radial direction is permitted while the surface pressure of the seal ring 15 with respect to the bush 12) is secured, and the outflow of exhaust can be suppressed.

Further, when the shaft 13 moves in the radial direction with respect to the bush 12, the seal ring 15 and the collar 16 can be moved following the movement of the shaft 13, so that the pressure applied to the expanded graphite seal ring 15 is applied. It is possible to prevent the seal ring 15 from being damaged.

Further, the angle θ1 between the seal inner peripheral surface 27 and the inclined outer peripheral surface 28 in the cross section of the seal ring 15 along the axial direction is set to about 30 degrees. In this way, since the angle between the seal inner peripheral surface 27 and the inclined outer peripheral surface 28 is smaller than 45 degrees, an axial force is input from the collar 16 to the seal ring 15 side, and the inclined inner circumference of the collar 16 is input. When a force from the collar 16 side is input from the surface 33 to the inclined outer peripheral surface 28 of the seal ring 15, the component force on the inner peripheral surface 27 side of the seal ring rather than the component force on the inner side contact surface 29 of the seal ring 15 Can be increased. Therefore, a sufficient surface pressure is secured between the seal inner peripheral surface 27 of the seal ring 15 and the sealed outer peripheral surface 23 of the shaft 13, and the seal inner peripheral surface 27 of the seal ring 15 and the sealed outer circumference of the shaft 13 are secured. The outflow of exhaust from the surface 23 can be suitably suppressed.

As described above, according to the present embodiment, it is possible to allow the shaft 13 to move in the radial direction with respect to the bush 12, and to suppress the outflow of exhaust gas.

In the present embodiment, the seal ring 15 is arranged on the inner side in the axial direction and the collar 16 is arranged on the outer side in the axial direction in the seal space 24 between the shaft 13 and the bush 12. May be arranged on the outer side (the other side) in the axial direction, and the collar 16 may be arranged on the inner side (one side) in the axial direction. In this case, the inclined outer peripheral surface 28 of the seal ring 15 is formed in a tapered shape that expands in diameter from the inner side (one side) in the axial direction to the outer side (the other side) in the axial direction, and is within the inclination of the collar 16. The peripheral surface 33 is formed in a tapered shape that reduces the diameter inward in the radial direction from the outer side (the other side) in the axial direction to the inner side (one side), and the inclined outer peripheral surface 28 of the seal ring 15 and the inclination of the collar 16 are inclined. The inner peripheral surface 33 comes into contact with each other. Even in this case, the outer end surface (first thrust surface) of the seal ring 15 comes into contact with the cover inner surface 26 of the projecting plate portion 25 of the cover 14 and seals between the cover inner surface 26 and the cover inner surface 26. Even if the exhaust gas enters the tubular spaces 31 and 36, the outflow of the exhaust gas from the tubular spaces 31 and 36 to the outside can be suppressed. In this way, even if the arrangement positions of the collar 16 and the seal ring 15 are exchanged, the outflow of exhaust gas is suppressed not only by the inner peripheral surface 27 of the seal of the seal ring 15 but also by the end surface on the outer side of the seal ring 15, which is effective. It is possible to suppress the outflow of exhaust gas.

Further, in the present embodiment, the cross-sectional shape of the seal ring 15 and the collar 16 along the axial direction is substantially trapezoidal, but the present invention is not limited to this. For example, the cross-sectional shape of the seal ring 15 and the collar 16 along the axial direction may be a substantially triangular shape without providing the non-inclined outer peripheral surface 30 of the seal ring 15 and the collar inner peripheral surface 32 of the collar 16. Even in this case, the shape of the seal ring 15 is a triangular cross section (cross section along the axial direction) partitioned between the inclined inner peripheral surface 33 of the collar 16 and the outer peripheral surface 23 to be sealed of the shaft 13. Defined by the space, the axial length of the seal ring 15 is set to be at least the axial length of the space having a triangular cross section.

Further, in the present embodiment, the seal ring 15 is formed by winding a sheet made of expanded graphite around a predetermined shaft to form a cylindrical shape and then compressing the sheet. The seal ring 15 can be molded by various methods without limitation.

Further, in the present embodiment, the outer diameter of the collar 16 and the outer diameter of the seal ring 15 are substantially the same diameter, but the diameter is not limited to this, and the outer diameter of the collar 16 in the radial direction and the diameter of the seal ring 15 are not limited to this. The outer diameter of the collar 16 and the outer diameter of the seal ring 15 are different from each other as long as the outer end in the direction is arranged at a position radially inward from the large-diameter inner peripheral surface 19 of the bush 12. It may be.

Further, in the present embodiment, the angle θ1 between the seal inner peripheral surface 27 and the inclined outer peripheral surface 28 in the cross section of the seal ring 15 along the axial direction is set to approximately 30 degrees, but the present invention is not limited to this. Absent. For example, the angle θ1 between the seal inner peripheral surface 27 and the inclined outer peripheral surface 28 in the cross section of the seal ring 15 along the axial direction may be set to an angle smaller than 45 degrees other than 30 degrees. Even in this case, when an axial force is input from the collar 16 side to the seal ring 15 side, the force is applied to the seal inner peripheral surface 27 side rather than the component force of the seal ring 15 on the inner side contact surface 29. The component force can be increased. Alternatively, the angle θ1 between the seal inner peripheral surface 27 and the inclined outer peripheral surface 28 in the cross section of the seal ring 15 along the axial direction may be an angle of 45 degrees or more and less than 90 degrees. In this case, when an axial force is input from the collar 16 side to the seal ring 15 side, the component force on the inner side contact surface 29 is larger than the component force on the seal inner peripheral surface 27 side of the seal ring 15. can do.

Further, in the present embodiment, the protruding plate portion 25 of the cover 14 is formed in an annular shape, but the present invention is not limited to this, and the outer contact surface 35 of the collar 16 may be formed in a supportable shape. it can. When the seal ring 15 is arranged on the outer side (the other side) in the axial direction and the collar 16 is arranged on the inner side (one side) in the axial direction, the protruding plate portion 25 of the cover 14 is formed in an annular shape. It is better to do it.

Next, a second embodiment of the present invention will be described with reference to the drawings. The valve structure 40 according to the present embodiment is obtained by adding a wave washer 41 to the valve structure 10 according to the first embodiment, and the same reference numerals are given to the same configuration as that of the first embodiment. Is added to omit the description. Further, in each figure, the alternate long and short dash line CL indicates the axial center of the rotating shaft of the shaft 13.

As shown in FIG. 6, the valve structure 40 includes a wave washer (biasing member) 41 in the seal space 24 between the shaft 13 and the bush 12. The axial length of the seal space 24 (the axial distance between the inner surface 26 of the cover of the protruding plate portion 25 of the cover 14 and the intermediate surface 20 of the bush 12) is the inner side of the seal ring 15 in the state where the seal ring is attached. It is formed longer than the axial length between the contact surface 29 and the outer contact surface 35 of the collar 16 in the collar-mounted state. In the seal space 24, before arranging the wave washer 41, the seal ring 15 is arranged on the inner side in the axial direction, and the collar 16 is arranged on the outer side in the axial direction. The inner side contact surface 29 of the seal ring 15 comes into contact with the intermediate surface 20 of the bush 12, and the outer side contact surface 35 of the collar 16 is arranged on the inner side of the outer end opening 21 of the bush 12. Between the outer contact surface 35 of the collar 16 and the inner surface 26 of the cover of the projecting plate portion 25 of the cover 14 in the cover fixed state, there is a part of the seal space 24, which is an annular shape extending in the axial direction. The space 42 is partitioned.

As shown in FIGS. 6, 7 (a) and 7 (b), the wave washer 41 is a thin plate annular washer, which is formed in a gentle wavy shape along the circumferential direction, and is formed in a gentle wavy shape along the circumferential direction in the axial direction of the collar 16. It is arranged in the space 42 on the outside side. The cover 14 is fixed to the bush 12 side in a state where the wave washer 41 is arranged in the space 42 on the outer side of the collar 16. The axial thickness L of the wave washer 41 in the state of not receiving an external force is set to be slightly longer than the axial length of the space 42. That is, the wave washer 41 is arranged in the space 42 between the outer side contact surface 35 of the collar 16 and the inner surface 26 of the cover of the protruding plate portion 25 of the cover 14 in a state of being slightly compressed and deformed in the axial direction. , The collar 16 is axially urged toward the seal ring 15. A part of the surface of the wave washer 41 on the outer side in the axial direction abuts on the inner surface 26 of the cover of the protruding plate portion 25 of the cover 14, and a part of the surface of the inner surface of the wave washer 41 in the axial direction is a part of the surface. , Abuts on the outer side contact surface 35 of the collar 16. The wave washer 41 presses the outer side contact surface 35 of the collar 16 from the protruding plate portion 25 side of the cover 14 toward the inner side in the axial direction to urge the collar 16. In the cover fixed state, the internal contact surface 29 of the seal ring 15 abuts on the intermediate surface 20 of the bush 12, and the external contact surface 35 of the collar 16 passes through the wave washer 41 to the protruding plate portion of the cover 14. The cover inner surface 26 side of the cover 25 is supported, and the collar 16 and the seal ring 15 are supported on the bush 12 side.

In the valve structure 40 configured as described above, the wave washer 41 urges the collar 16 from the protruding plate portion 25 side of the cover 14 toward the inner side (seal ring 15 side) in the axial direction. Therefore, the sealed ring 15 made of expanded graphite is compressed in the axial direction to obtain the surface pressure between the inner peripheral surface 27 of the seal ring 15 and the outer peripheral surface 23 to be sealed of the shaft 13, and the inner side of the seal ring 15. The surface pressure between the contact surface 29 and the intermediate surface 20 of the bush 12 can be secured, and the outflow of exhaust can be effectively suppressed.

As described above, according to the present embodiment, it is possible to allow the shaft 13 to move in the radial direction with respect to the bush 12, and to suppress the outflow of exhaust gas.

In the present embodiment, the seal ring 15 is arranged on the inner side in the axial direction and the collar 16 is arranged on the outer side in the axial direction in the seal space 24 between the shaft 13 and the bush 12. May be arranged on the outer side (the other side) in the axial direction, and the collar 16 may be arranged on the inner side (one side) in the axial direction. In this case, the inclined outer peripheral surface 28 of the seal ring 15 is formed in a tapered shape that expands in diameter from the inner side (one side) in the axial direction to the outer side (the other side) in the axial direction, and is within the inclination of the collar 16. The peripheral surface 33 is formed in a tapered shape that reduces the diameter inward in the radial direction from the outer side (the other side) in the axial direction to the inner side (one side), and the inclined outer peripheral surface 28 of the seal ring 15 and the inclination of the collar 16 are inclined. The inner peripheral surface 33 comes into contact with each other. The wave washer 41 is arranged between the intermediate surface 20 of the bush 12 and the inner end surface (second thrust surface) of the collar 16 and presses the inner end surface of the collar 16 to shaft the collar 16. Bounce to the outside of the direction. Even in this case, the outer end surface (first thrust surface) of the seal ring 15 comes into contact with the cover inner surface 26 of the projecting plate portion 25 of the cover 14 and seals between the cover inner surface 26 and the cover inner surface 26. Even if the exhaust gas enters the tubular spaces 31 and 36, the outflow of the exhaust gas from the tubular spaces 31 and 36 to the outside can be suppressed. In this way, even if the arrangement positions of the collar 16 and the seal ring 15 are exchanged, the outflow of exhaust gas is suppressed not only by the inner peripheral surface 27 of the seal of the seal ring 15 but also by the end surface on the outer side of the seal ring 15, which is effective. It is possible to suppress the outflow of exhaust gas.

Further, in the present embodiment, the wave washer 41 is provided as an urging means for urging the collar 16 toward the seal ring 15, but the urging means is not limited to this. For example, a coil spring, an elastically deformable resin ring, or the like may be provided as an urging means for urging the collar 16 toward the seal ring 15.

Next, a third embodiment of the present invention will be described with reference to the drawings. In the valve structure 50 according to the present embodiment, the seal ring 15 of the first embodiment and the second embodiment is provided with a notch 52, and the notch 52 is provided with a washer 51. The same reference numerals are given to the embodiments and the same configurations as those of the second embodiment, and the description thereof will be omitted. Further, in each figure, the alternate long and short dash line CL indicates the axial center of the rotating shaft of the shaft 13. Further, FIG. 8 shows a seal ring 15 of the second embodiment provided with a washer 51.

As shown in FIGS. 8, 9 (a) and 9 (b), the seal ring 15 has an annular notch 52 (in which the corners of the inner peripheral surface 27 of the seal and the inner contact surface 29 are cut out). Space). The inner diameter of the notch 52 is substantially the same as the inner diameter of the inner peripheral surface 27 of the seal, and the outer diameter of the notch 52 is smaller than the outer diameter of the seal ring 15 (the outer diameter of the non-inclined outer peripheral surface 30). That is, the internal contact surface 29 of the seal ring 15 is arranged on the radial outer side of the notch 52.

The washer 51 is a metal flat plate annular washer, and is formed to have substantially the same size as the notch 52 so that it can be arranged in the notch 52 of the seal ring 15. With the washer 51 arranged in the notch 52 of the seal ring 15, the inner diameter of the washer 51 is substantially the same as the inner diameter of the inner peripheral surface 27 of the seal of the seal ring 15. That is, the washer 51 has a washer inner peripheral surface 53 having substantially the same diameter as the seal inner peripheral surface 27 of the seal ring 15. Further, the washer surface 54 on the inner side of the washer 51 in the axial direction is arranged on substantially the same plane as the inner side contact surface 29 of the seal ring 15.

In the valve structure 50 configured as described above, the seal ring 15 has an annular notch 52 in which the corners of the inner peripheral surface 27 of the seal and the internal contact surface 29 are notched, and the notch 52 is formed. A washer 51 is arranged inside. In this way, since the metal washer 51 made of metal harder than expanded graphite is provided on the inner side contact surface 29 side (thick wall side) of the seal ring 15, the shape of the seal ring 15 on the thick wall side is prevented from being lost. be able to.

Further, since the washer 51 is provided on the radial inside (the inner peripheral surface 27 side of the seal) of the internal contact surface 29 of the seal ring 15, damage to the seal ring 15 radially inside the internal contact surface 29 is prevented. It is possible to prevent the generation of fragments of the seal ring 15 from the corner side of the inner side contact surface 29 of the seal ring 15 and the seal inner peripheral surface 27. Therefore, it is possible to prevent the fragment of the seal ring 15 from entering between the outer peripheral surface 23 of the shaft 13 to be sealed and the inner peripheral surface 27 of the seal of the seal ring 15 from the corner side of the seal ring 15, and the seal ring 15 is prevented from entering. It is possible to prevent the rotation of the shaft 13 from being hindered by the fragments of the above.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the contents of the above-described embodiment, and can be appropriately modified without departing from the present invention. That is, it goes without saying that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are included in the category of the present invention.

For example, in each of the above embodiments, one end side of the shaft 13 is projected to the outside of the exhaust pipe 3, but both ends of the shaft 13 may be projected to the outside of the exhaust pipe 3. In this case, the valve structures 10, 40, 50 according to the embodiment of the present invention may be applied to both ends of the shaft 13.

Further, in each of the above embodiments, the valve structures 10, 40, and 50 according to the embodiment of the present invention are applied to the valve structure of the butterfly valve, but the present invention is not limited to this, and the shaft is external from the housing. It can be applied to various valves that are rotatably supported via a bush in a protruding state. For example, the valve structures 10, 40, 50 according to one embodiment of the present invention may be applied to the valve structure of a ball valve. Further, the valve structures 10, 40, 50 according to the embodiment of the present invention may be applied to a valve structure other than the exhaust brake.

3: Exhaust pipe (housing)
10, 40, 50: Valve structure 11: Butterfly valve (open / close valve)
12: Bush 12a: Shaft insertion hole 13: Shaft 14: Cover (holding member)
15: Seal ring 16: Collar (contact ring)
18: Small-diameter inner peripheral surface of the bush 19: Large-diameter inner peripheral surface of the bush 20: Intermediate surface of the bush 22: Supported outer peripheral surface of the shaft 23: Sealed outer peripheral surface of the shaft 25: Protruding plate portion of the cover 26: Protruding plate Inner surface of the cover (protruding facing surface)
27: Seal inner peripheral surface of the seal ring 28: Inclined outer peripheral surface of the seal ring 29: Internal side contact surface of the seal ring (first thrust surface)
33: Inclined inner peripheral surface of the collar (inclined inner peripheral surface of the contact ring)
34: Color outer peripheral surface (outer peripheral surface of abutment ring)
35: External contact surface of the collar (second thrust surface of the contact ring)
41: Wave washer (biasing member)
51: Washer 52: Notch 53 of seal ring: Inner peripheral surface of washer 54: Surface of washer

Claims (4)

It is a valve structure in which an on-off valve is provided in the housing.
A small-diameter inner peripheral surface extending along a predetermined axial direction, a large-diameter inner peripheral surface having a diameter larger than the small-diameter inner peripheral surface and extending along the axial direction, and the small-diameter inner peripheral surface intersecting the axial direction. And an annular intermediate surface connecting the large-diameter inner peripheral surface and the large-diameter inner peripheral surface, and the large-diameter inner peripheral surface is fixed to the housing in a state of being arranged on the outer side of the housing with respect to the small-diameter inner peripheral surface. A bush in which the small-diameter inner peripheral surface, the intermediate surface, and the large-diameter inner peripheral surface partition the shaft insertion hole.
It has a supported outer peripheral surface supported by the small-diameter inner peripheral surface of the bush and a sealed outer peripheral surface arranged at a position facing the large-diameter inner peripheral surface of the bush, and inserts the shaft insertion hole. A shaft that extends along the axial direction, is rotatably supported by the bush, and is fixed to the on-off valve.
It has a protruding facing surface that protrudes inward in the radial direction from the large-diameter inner peripheral surface of the bush on the outer side of the bush and is arranged at a position facing the intermediate surface of the bush, and is located on the bush side. Supporting restraint members and
The inner peripheral surface of the seal that extends along the axial direction and abuts on the outer peripheral surface of the shaft to be sealed, and the inner peripheral surface of the seal that is inclined with respect to the axial direction and radially outward from one side in the axial direction to the other side. It has a tapered inclined outer peripheral surface that expands in diameter and a first thrust surface that is arranged at the other end and intersects the axial direction, and the outer end in the radial direction is inside the large diameter of the bush. An annular seal ring made of expanded graphite, which is arranged radially inward from the peripheral surface and is supported on the bush side,
The outer peripheral surface of the bush, which is arranged at a position radially inwardly separated from the large-diameter inner peripheral surface and extends along the axial direction, and the other side of the bush which is inclined with respect to the axial direction and extends in the axial direction. It has a tapered inner peripheral surface that is tapered inward in the radial direction toward one side, and a second thrust surface that is arranged at one end and intersects the axial direction. An annular contact ring supported on the bush side in a state where the peripheral surface is in contact with the inclined outer peripheral surface of the seal ring is provided.
The first thrust surface of the seal ring abuts on one of the intermediate surface of the bush or the protruding facing surface of the holding member.
A valve structure characterized in that the second thrust surface of the abutting ring is supported from the intermediate surface of the bush or the other surface side of the protruding facing surface of the holding member. The valve structure according to claim 1.
An urging that is arranged between the second thrust surface of the abutting ring and the other surface and presses the second thrust surface from the other surface side to urge the abutment ring. Equipped with members
A valve structure characterized in that the second thrust surface of the contact ring is supported from the other surface side via the urging member. The valve structure according to claim 1 or 2.
Equipped with an annular washer that is harder than expanded graphite
The seal ring has an annular notch portion in which a corner portion between the first thrust surface and the inner peripheral surface of the seal is notched.
The washer has a washer inner peripheral surface having substantially the same diameter as the seal inner peripheral surface of the seal ring and a washer surface on substantially the same plane as the first thrust surface of the seal ring. A valve structure characterized in that it is arranged in the notch. The valve structure according to any one of claims 1 to 3.
A valve structure characterized in that the angle between the inner peripheral surface of the seal and the inclined outer peripheral surface in the cross section of the seal ring along the axial direction is smaller than 45 degrees.

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