JP2011012749A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing performance of a valve device by using resin having high elasticity for a seal ring.SOLUTION: In the valve device 1, an outer periphery of a valve element 3 is surrounded and covered by a resin ring 7. The resin ring 7 is elastically deformed more easily than a conventional metal seal ring, and is softly deformed when being energized by a gas pressure on an upstream side, and is firmly adhered to an inner peripheral surface 15 of a valve housing 5 and an outer peripheral end of the valve element 3. That is, the larger the gas pressure is, the more largely the resin ring 7 tries to elastically deform, and the resin ring 7 is more firmly adhered to the inner peripheral surface 15 of the valve housing 5 and the outer peripheral end of the valve element 3. By this self-sealing function of the resin ring 7, a gap in a radial direction of a flow passage 2 and a gap in an axial direction of the flow passage 2 can be sealed in a higher degree, and the sealing performance of the valve device 1 can be enhanced.

Description

  The present invention relates to a valve device that varies the degree of opening of a fluid flow path by the rotation of a valve body, and particularly relates to a valve device that is incorporated in an exhaust system of an engine and operates an exhaust gas passage amount.

Conventionally, as shown in FIG. 7 (a), in an EGR valve device 100 that is incorporated in an exhaust system of an engine (not shown) and manipulates the passage amount of exhaust gas, the opening degree of the gas flow path 101 is set as follows. A device including a variable valve body 102 and a valve housing 103 that rotatably accommodates the valve body 102 is known (for example, see Patent Document 1).
According to the valve device 100, a part of the gas channel 101 is formed by the inner peripheral surface 104 of the valve housing 103, and the valve body 102 is accommodated in the gas channel 101 formed by the inner peripheral surface 104. .

  Further, according to the valve device 100, an annular groove 105 that opens toward the outer peripheral side is provided on the outer peripheral edge of the valve body 102 in order to suppress gas leakage in the fully closed state that blocks the passage of gas. A metal seal ring 106 is fitted into 105. Then, the valve device 100 rotates the valve body 102 to bring the seal ring 106 into annular contact with the inner peripheral surface 104 of the valve housing 103, thereby bringing the gas flow path 101 into a fully closed state.

  By the way, in the fully closed state, as shown in FIG. 7B, the outer peripheral end 107 of the seal ring 106 contacts the inner peripheral surface 104 by the elasticity of the seal ring 106 itself, and the downstream end 108 of the seal ring 106 is The gas is urged downstream by the upstream gas pressure and is in contact with the side surface 109 of the groove 105. A gap in the radial direction of the gas flow path 101 is blocked by the contact between the outer peripheral end 107 and the inner peripheral surface 104, and a gap in the axial direction of the gas flow path 101 is sealed by the contact between the downstream end 108 and the side surface 109. Thus, gas leakage in the fully closed state is suppressed.

For this reason, in the valve device 100, the gas leakage suppression capability in the fully closed state (hereinafter referred to as sealing performance) is the adhesion between the inner peripheral surface 104 and the outer peripheral end 107, and the adhesion between the downstream end 108 and the side surface 109. In order to improve the sealing performance, further improvement of these adhesion properties is required.
Further, the seal ring 106 is provided in a C shape and is fitted into the groove 105 to form a joint. For this reason, gas leakage that passes through the gap at the joint (the gap in the circumferential direction of the gas flow path 101) is also an impediment to improving the sealing performance.

International Publication No. 04/057219 Pamphlet

  The present invention has been made to solve the above problems, and an object thereof is to improve the sealing performance of the valve device.

[Means of Claim 1]
According to a first aspect of the present invention, there is provided a valve device comprising: a valve body that varies a degree of opening of the fluid flow path; and a valve housing that rotatably accommodates the valve body. The valve body is housed in a fluid flow path formed by the inner peripheral surface of the valve housing. The valve device includes an annular resin ring, and a circumferential groove into which the outer peripheral edge of the valve body is fitted is provided on the inner periphery of the resin ring. The valve body is accommodated in the fluid flow path in a state of being fitted in the circumferential groove, and the valve device rotates the valve body to bring the outer periphery of the resin ring into annular contact with the inner peripheral surface of the valve housing. As a result, the fluid flow path is fully closed.

  Thereby, the outer periphery of the valve body is surrounded and covered with a resin ring made of a resin having higher elasticity than that of a metal that is a material of a conventional seal ring. For this reason, the resin ring is more easily elastically deformed than the conventional seal ring. Adhere firmly. That is, as the gas pressure increases, the resin ring is more firmly adhered to the inner peripheral surface of the valve housing and the outer peripheral edge of the valve body in an attempt to be more elastically deformed.

  And, by such a self-sealing function of the resin ring, mainly the gap in the radial direction of the fluid flow path and the gap in the axial direction of the fluid flow path can be sealed to a higher degree. Sealing performance can be improved.

[Means of claim 2]
According to the valve device of the second aspect, the resin ring is provided in a C shape so as to form a joint with the valve body fitted in the circumferential groove. Further, the two ring ends forming the abutment include a projecting piece projecting in the circumferential direction from one ring end toward the other ring end, and a missing space provided in the other ring end to accommodate the projecting piece. At least one protruding missing pair is formed. When the projecting piece is accommodated in the missing space, the two ring ends form a circumferential contact surface combination in which the two ring ends are opposed to each other in the circumferential direction, at at least two different positions.

  Thereby, in the fully closed state, the flow of the fluid that is about to leak through the gap at the joint (the gap in the circumferential direction of the fluid flow path) becomes a maze. For this reason, since it becomes difficult to produce the leakage of the fluid which goes through the clearance gap of a joint, the sealing performance of a valve apparatus can further be improved.

[Means of claim 3]
According to the valve device of the third aspect, two or more protrusion missing pairs are formed, and the circumferential contact surface combination is formed at three or more different positions.
This means shows one aspect of a structure that can suppress the leakage of fluid by forming a gap at the abutment as a labyrinth. According to this aspect, in the fully closed state, it is possible to significantly suppress fluid leakage through the gap of the joint.

[Means of claim 4]
According to the valve device of the fourth aspect, the valve body and the resin ring are heat-treated (annealed) in a state of a subassembly in which the outer peripheral edge of the valve body is fitted in the circumferential groove.
As a result, the resin ring contracts and tightly adheres to the valve body, so that the sealing performance of the valve device is further enhanced.

[Means of claim 5]
According to the valve device of the fifth aspect, the resin ring has an annular shape other than a circle on the outer periphery.
As a result, the resin ring does not rotate in the circumferential direction in the fully closed state, so that the fully closed state is stabilized.

[Means of claim 6]
The valve device according to claim 6 is incorporated in an exhaust system of the engine to control the passage amount of the exhaust gas.
This means shows one mode of use of the valve device. According to this aspect, for example, when the valve device is applied to EGR, the corrosion resistance against the condensed water contained in the exhaust gas to be refluxed (hereinafter referred to as reflux gas) can be improved.

  That is, in EGR, the recirculation gas is generally cooled by a heat exchanger or the like in order to prevent a reduction in intake charging efficiency due to high-temperature exhaust gas recirculation. For this reason, since a large amount of condensed water is contained in the reflux gas, it is necessary to consider the corrosion resistance of the metal part against the condensed water in the valve device. Regarding such corrosion resistance, the corrosion resistance of the valve device against condensed water can be increased by using a resin ring made of a resin having high corrosion resistance against water instead of the conventional metal seal ring.

[Means of Claim 7]
The valve device according to claim 7 is provided with a valve shaft which is attached to the valve body and receives torque from a predetermined actuator and rotates together with the valve body, and the valve shaft is substantially flush with the valve body. It is attached to the valve body and intersects the resin ring at at least one portion in the circumferential direction of the resin ring. And the part which cross | intersects a valve axis | shaft in resin-made rings is provided in the concave shape so that it may cross | intersect while fitting a valve axis | shaft.

  According to the conventional valve device incorporated in the exhaust system of the engine, the valve shaft is welded or the like so as to be inclined with respect to the surface direction of the valve body so that the bearing portion is arranged on the downstream side of the valve body. It is fixed to the valve body, and deposit accumulation on the bearing portion is suppressed (see FIG. 7A). For this reason, in order to incline and weld a valve stem with respect to a valve body, it is necessary to provide a valve body thickly by forging and cutting, and a valve apparatus is expensive. Further, since the bearing portion is arranged downstream of the valve body, the valve device is enlarged.

  In contrast to the disadvantages of the conventional valve device incorporated in the exhaust system of the engine, a portion of the resin ring that intersects the valve shaft is provided in a concave shape so as to intersect with the valve shaft while being fitted. It is possible to inhibit deposits in the bearing portion by preventing entry into the bearing portion.

As a result, even if the valve shaft is attached to the valve body so as to be substantially flush with the valve body and the bearing portion is disposed at the same position as the valve body in the exhaust flow direction, deposit accumulation on the bearing portion is ensured. Can be suppressed. For this reason, there is no need to incline and weld the valve shaft to the valve body, so that the valve body can be provided thinly by a press or the like, and the valve shaft and the valve body can be easily integrated by rivets, screws, etc. it can.
As described above, the valve device can be downsized and the cost of the valve device can be reduced.

(A) is explanatory drawing which shows a valve apparatus, (b) is AA sectional drawing of (a), (c) is BB sectional drawing of (a) (Example). (A) is a front view of a valve body, (b) is a top view of a valve body (Example). (A) is explanatory drawing which shows resin-made rings, (b) is CC sectional drawing of (a), (c) is DD sectional drawing of (a) (Example). (A) is explanatory drawing which shows the concept of the joint of a resin ring by planar view, (b) is explanatory drawing which shows the concept of the joint of a resin ring by side view, (c) is the concept of a ring end (Example). (A) is explanatory drawing which shows a spring, (b) is EE sectional drawing of (a) (Example). It is a perspective view which shows the concept of the joint of a resin ring (modification example). (A) is explanatory drawing which shows a valve apparatus, (b) is explanatory drawing which shows the blockade by the seal ring in a fully-closed state (conventional example).

  A valve device according to an embodiment includes a valve body that varies the opening degree of a fluid flow path, and a valve housing that rotatably accommodates the valve body, and a part of the fluid flow path is formed by an inner peripheral surface of the valve housing. In addition, the valve body is accommodated in a fluid flow path formed by the inner peripheral surface of the valve housing. The valve device includes an annular resin ring, and a circumferential groove into which the outer peripheral edge of the valve body is fitted is provided on the inner periphery of the resin ring. The valve body is accommodated in the fluid flow path in a state of being fitted in the circumferential groove, and the valve device rotates the valve body to bring the outer periphery of the resin ring into annular contact with the inner peripheral surface of the valve housing. As a result, the fluid flow path is fully closed.

  Further, the resin ring is provided in a C shape so as to form a joint with the valve body fitted in the circumferential groove. Further, the two ring ends forming the abutment include a projecting piece projecting in the circumferential direction from one ring end toward the other ring end, and a missing space provided in the other ring end to accommodate the projecting piece. At least one protruding missing pair is formed. When the projecting piece is accommodated in the missing space, the two ring ends form a circumferential contact surface combination in which the two ring ends are opposed to each other in the circumferential direction, at at least two different positions.

More specifically, two or more protruding missing pairs are formed, and the circumferential contact surface combination is formed at three or more different positions.
The valve body and the resin ring are heat-treated in the state of a subassembly in which the outer peripheral edge of the valve body is fitted in the circumferential groove.
The resin ring has an annular shape other than a circle on the outer periphery.

The valve device is incorporated in the exhaust system of the engine to control the passage amount of the exhaust gas.
Here, the valve device includes a valve shaft that is attached to the valve body and receives torque from a predetermined actuator and rotates together with the valve body. The valve shaft is attached to the valve body so as to be substantially flush with the valve body, and intersects the resin ring at at least one portion in the circumferential direction of the resin ring. And the part which cross | intersects a valve axis | shaft in resin-made rings is provided in the concave shape so that it may cross | intersect while fitting a valve axis | shaft.

[Configuration of Example]
The structure of the valve apparatus 1 of an Example is demonstrated based on FIGS.
The valve device 1 is configured to vary the opening degree of the flow path 2 through which the fluid passes by the rotation of the valve body 3. This is applied to EGR that manipulates the passage of gas (reflux gas).

  That is, as shown in FIG. 1, the valve device 1 includes a valve body 3 that changes the opening degree of the flow path 2 of the reflux gas, a valve housing 5 that rotatably accommodates the valve body 3, and a valve body 3. A valve shaft 6 that is attached and receives torque transmitted from a predetermined actuator (not shown) and rotates together with the valve body 3, and an annular resin that surrounds the valve body 3 from the outer peripheral side and holds it on its inner peripheral side A ring 7 and a spring 8 that is held on the inner peripheral side of the resin ring 7 and firmly integrates the valve body 3 and the resin ring 7 are provided.

  The valve device 1 receives an instruction from an electronic control unit (ECU: not shown) that variably controls the opening degree of the flow path 2 to operate the actuator, and the valve body 3 and the valve shaft 6 are operated by the operation of the actuator. While rotating, the opening degree of the flow path 2 is varied, and the passing amount of the reflux gas in the flow path 2 is manipulated.

As shown in FIGS. 1 and 2, the valve body 3 is provided in a substantially disc shape. The valve body 3 has a substantially semi-cylindrical valve shaft housing portion 10 that accommodates the shaft core of the valve shaft 6 so as to match the diameter of the valve shaft 6. A flat surface 11 perpendicular to the axis 6 is formed. Further, the valve shaft housing 10 is provided with a hole 13 through which the rivet 12 is passed.
In the following description, unless otherwise specified, the axial direction, the circumferential direction, and the radial direction are directions related to the valve body 3 and the resin ring 7 (for this reason, the shaft in the fully closed state that blocks the passage of the reflux gas) The direction coincides with the flow direction of the reflux gas in the flow path 2).

As shown in FIG. 1, the valve housing 5 forms a part of the flow path 2 with its inner peripheral surface 15, and the valve body 3 and the resin ring 7 are formed in the flow path 2 formed by the inner peripheral surface 15. And the spring 8 and the like.
The valve shaft 6 is housed in the valve shaft housing portion 10 and attached to the valve body 3 so as to be substantially flush with the valve body 3. The valve shaft 6 and the valve body 3 are integrated by a rivet 12.

  The resin ring 7 is made of a thermoplastic resin having excellent heat resistance such as PEEK (polyetheretherketone), PPS (polyphenylene sulfide) or PA46 (polyamide 46).

  As shown in FIGS. 1 and 3, a circumferential groove 16 into which the outer peripheral edge of the valve body 3 is fitted is provided on the inner circumference of the resin ring 7, and the resin ring 7 is inserted into the circumferential groove 16 in the valve body 3. , The valve body 3 is surrounded from the outer peripheral side and held on its inner peripheral side. And the valve apparatus 1 makes the flow path 2 fully closed by rotating the valve body 3 and making the outer peripheral surface of the resin ring 7 contact annularly with the inner peripheral surface 15.

  Further, a second circumferential groove 17 that is continuous with the circumferential groove 16 and has a smaller diameter than the circumferential groove 16 is provided on one axial side of the circumferential groove 16. In addition, the 2nd circumferential groove 17 accommodates the spring 8 so that it may mention later.

The resin ring 7 is assembled to the valve shaft 6 so as to intersect the valve shaft 6 at two portions constituting the diameter. A portion of the resin ring 7 that intersects with the valve shaft 6 is provided in a concave shape so as to intersect with the valve shaft 6 while fitting to form a concave portion 18.
Here, the outer peripheral side of the concave portion 18 forms a substantially semi-annular flat surface 19 perpendicular to the axis of the valve shaft 6, and the outer peripheral shape of the resin ring 7 is such that part of a circle is parallel to each other. The track shape is a straight line. The flat surface 19 rotates and slides on the flat surface 20 on the valve housing 5 side that forms a part of the inner peripheral surface 15 when the valve body 3 rotates.

  The resin ring 7 is provided in a C shape so as to form the joint 23 in a state where the valve body 3 is fitted in the circumferential groove 16. The two ring ends 24 and 25 forming the abutment 23 are formed with two protruding missing pairs, and a circumferential contact surface combination is formed at three different positions.

  Here, as shown in FIG. 4, the projecting missing pair includes, for example, a projecting piece 27 projecting in the circumferential direction from one ring end 24 toward the other ring end 25, and a projecting piece provided on the ring end 25. It consists of a missing space 28 that houses the piece 27. And according to the valve apparatus 1 of an Example, between the protrusion piece 29 which protrudes in the circumferential direction toward the ring end 24 from the ring end 25, and the missing space 30 which is provided in the ring end 24 and accommodates the protrusion piece 29 In addition, a projecting missing pair is formed, and two projecting missing pairs are formed together with the projecting missing pair formed between the projecting piece 27 and the missing space 28.

  The circumferential contact surface combination is, for example, a combination of flat surfaces 32 and 33 that face each other in the circumferential direction when the protruding piece 27 is accommodated in the missing space 28. Here, the flat surface 32 is provided at the tip of the projecting piece 27 as a plane perpendicular to the circumferential direction, and the flat surface 33 is provided at the innermost part of the missing space 28 as a plane perpendicular to the circumferential direction.

  And according to the valve apparatus 1 of an Example, by the protrusion piece 27 being settled in the missing space 28, in addition to the combination of the flat surfaces 32 and 33, the combination of the flat surfaces 34 and 35 and the flat surfaces 36 and 37 The combination of the circumferential contact surfaces is also formed by the combination.

  Here, the flat surface 34 is provided at the tip of the protruding piece 29 as a plane perpendicular to the circumferential direction, and the flat surface 35 is provided at the innermost part of the missing space 30 as a plane perpendicular to the circumferential direction. Further, the flat surface 36 is provided as a plane perpendicular to the circumferential direction on the inner peripheral side of the protruding piece 27 and the missing space 30 at the ring end 24, and the flat surface 37 is provided at the ring end 25 at the protruding piece 29 and the missing space. 28 is provided as a plane perpendicular to the circumferential direction on the inner peripheral side of 28.

  According to the valve device 1 of the embodiment, since the protruding piece 29 is accommodated in the missing space 30 when the protruding piece 27 is accommodated in the missing space 28, the flat surfaces 32, 33 can be obtained even if the protruding piece 29 is accommodated in the missing space 30. , A combination of flat surfaces 34 and 35, and a combination of flat surfaces 36 and 37, three circumferential abutment surface combinations are formed.

  Further, at the ring end 24, the end face 40 on one end side in the axial direction of the protruding piece 27 is provided perpendicular to the axial direction and extends in the circumferential direction so as to form the missing space 30. An end face 41 on the other end side in the axial direction of 29 is provided perpendicular to the axial direction and extends in the circumferential direction so as to form a missing space 28. Then, when the protruding piece 27 is accommodated in the missing space 28 (or when the protruding piece 29 is accommodated in the missing space 30), the end faces 40 and 41 abut against each other in the axial direction.

  Furthermore, the peripheral surface 42 that forms the missing space 30 together with the flat surface 35 and the end surface 40 at the ring end 24, and the peripheral surface 43 that forms the missing space 28 together with the flat surface 33 and the end surface 41 at the ring end 25 are the protruding pieces 27. Is accommodated in the missing space 28 (or when the projecting piece 29 is accommodated in the missing space 30), the inner peripheral surface 44 of the projecting piece 29 and the inner peripheral surface 45 of the projecting piece 27 are in radial contact with each other. .

  As shown in FIGS. 1 and 5, the spring 8 is annularly provided along the outer peripheral edge of the valve body 3 and exhibits elasticity in the axial direction. The spring 8 is arranged coaxially with the valve body 3 on the inner periphery of the resin ring 7 and is accommodated in the second circumferential groove 17 to urge the valve body 3 toward the other side in the axial direction. Thus, the valve body 3 is firmly brought into contact with the groove side surface 48 on the other axial end side forming the circumferential groove 16.

  The valve body 3, the valve shaft 6, the resin ring 7, and the spring 8 are integrated to form a subassembly. The subassembly is assembled to the valve housing 5 to constitute the valve device 1. In the state of the subassembly, the outer peripheral edge of the valve body 3 is fitted in the circumferential groove 16 and the spring 8 is fitted in the second circumferential groove 17. The subassembly in such a state is subjected to heat treatment. Then, the subassembly after the heat treatment is assembled to the valve housing 5.

[Effects of Examples]
The valve device 1 of the embodiment includes an annular resin ring 7, and a circumferential groove 16 into which the outer peripheral edge of the valve body 3 is fitted is provided on the inner periphery of the resin ring 7. Then, the valve device 1 rotates the valve body 3 to bring the outer periphery of the resin ring 7 into annular contact with the inner peripheral surface 15 of the valve housing 5, thereby bringing the flow path 2 into a fully closed state.
As a result, the outer periphery of the valve body 3 is surrounded and covered by the resin ring 7 made of a resin having higher elasticity than the metal that is the material of the conventional seal ring.

  For this reason, since the resin ring 7 is more elastically deformed than the conventional seal ring, the resin ring 7 is flexibly deformed when urged by the upstream gas pressure, and the inner peripheral surface 15 of the valve housing 5 or the valve body 3. Firmly adheres to the outer periphery of That is, as the gas pressure increases, the resin ring 7 tightly adheres to the inner peripheral surface 15 of the valve housing 5 and the outer peripheral edge of the valve body 3 so as to be more elastically deformed. And, by such a self-sealing function of the resin ring 7, mainly the gap in the radial direction of the flow path 2 and the gap in the axial direction of the flow path 2 can be sealed to a higher degree. 1 sealing performance can be improved.

  In addition, the resin ring 7 is provided in a C shape to form a joint 23, and the ring ends 24 and 25 forming the joint 23 have two protruding missing pairs (a pair of a protruding piece 27 and a missing space 28, And a pair of projecting piece 29 and missing space 30 is formed, and circumferential contact surface combinations (combination of flat surfaces 32 and 33, combination of flat surfaces 34 and 35, and flat surfaces 36 and 37 at three different positions). Is formed).

Thereby, in the fully closed state, the flow of the reflux gas that tries to leak through the gap (gap in the circumferential direction) of the abutment 23 becomes a maze. For this reason, since it becomes difficult to produce the recirculation | reflux gas leak via the clearance gap of the abutment 23, 1 seal performance of a valve apparatus can further be improved.
In addition, by forming two protrusion missing pairs and forming the circumferential contact surface combination at three different positions, the processing of the ring ends 24 and 25 is not complicated, and in the fully closed state, Leakage of the reflux gas passing through the gap can be greatly suppressed.

Further, the valve body 3 and the resin ring 7 are heat-treated (annealed) in a state of a subassembly in which the outer peripheral edge of the valve body 3 is fitted in the circumferential groove 16.
As a result, the resin ring 7 contracts and tightly adheres to the valve body 3, so that the sealing performance of the valve device 1 is further enhanced.

Further, the outer peripheral shape of the resin ring 7 has a track shape in which a part of a circle is two straight lines parallel to each other.
As a result, the resin ring 7 does not rotate in the circumferential direction in the fully closed state, so that the fully closed state is stabilized.

Further, the valve device 1 is incorporated in an exhaust system of an engine to operate a passing amount of the reflux gas, and is applied to EGR.
Thereby, the valve apparatus 1 becomes a thing with high corrosion resistance with respect to the condensed water contained in recirculation | reflux gas. That is, regarding the corrosion resistance of the metal part against the condensed water, the resin ring 7 made of a resin having a high corrosion resistance against water is used instead of the conventional metal seal ring, so that the corrosion resistance against the condensed water of the valve device 1 is improved. Can be increased.

The valve shaft 6 is housed in the valve shaft housing portion 10 and attached to the valve body 3 so as to be substantially flush with the valve body 3, and the resin ring 7 has a valve shaft at two portions constituting the diameter. The valve shaft 6 and the valve body 3 are assembled so as to intersect with the valve 6. A portion of the resin ring 7 that intersects with the valve shaft 6 is provided in a concave shape so as to intersect with the valve shaft 6 while fitting to form a concave portion 18.
Thereby, since it can block | prevent that a deposit goes to a bearing part (not shown) by the concave-shaped part 18, deposit accumulation to a bearing part can be suppressed.

For this reason, even if the bearing portion is arranged at the same position as the valve body 3 with respect to the flow direction of the exhaust gas, deposits are difficult to accumulate on the bearing portion. It is not necessary to incline and weld the valve shaft 6 with respect to the valve body 3. As a result, the valve body 3 can be provided thinly by pressing or the like, and the valve shaft 6 and the valve body 3 can be easily integrated by the rivet 12 or the like.
As described above, the valve device 1 can be downsized and the cost of the valve device 1 can be reduced.

[Modification]
According to the valve device 1 of the embodiment, at the joint 23 of the resin ring 7, two pairs of missing protrusions are formed and the circumferential contact surface combinations are formed at three different positions. 7 is not limited to this.
For example, as shown in FIG. 6, one protruding missing pair may be formed on one axial end side and the outer peripheral side of the ring ends 24 and 25, and the circumferential contact surface combination may be formed at two different positions. .

  In this case, the projecting piece 50 is provided on the end surface 51 of the ring end 25 so as to project toward the ring end 24 from a position near one end in the axial direction and near the outer periphery, and the missing space 52 is an end surface 53 of the ring end 24. In FIG. 2, the groove is provided so as to be recessed in a direction opposite to the direction from the position near the one end in the axial direction and toward the ring end 25 from the position near the outer periphery.

Then, when the protruding piece 50 fits in the missing space 52, one protruding missing pair is formed, and a circumferential contact surface combination is formed between the front end surface 55 of the protruding piece 50 and the inner surface 56 of the missing space 52. In addition, a circumferential contact surface combination is formed between the end surfaces 51 and 53 (that is, the circumferential contact surface combination is formed at two different positions).
Further, three or more protruding missing pairs may be formed, or a circumferential contact surface combination may be formed at four or more different positions.

Further, according to the valve device 1 of the embodiment, the resin ring 7 is assembled to the valve shaft 6 so as to intersect the valve shaft 6 at two portions constituting the diameter. Alternatively, the valve shaft 6 and the resin ring 7 may intersect at one portion in the circumferential direction.
Further, according to the valve device 1 of the embodiment, the outer peripheral shape of the resin ring 7 has a track shape, but the outer peripheral shape may be an annular shape other than a circle. For example, the outer peripheral shape is elliptical. It may be provided.

  Furthermore, although the valve apparatus 1 of Example 1 is applied to EGR and manipulates the flow rate of the reflux gas, the application target is not limited to EGR.

1 Valve device 2 Channel (fluid channel)
3 Valve body 5 Valve housing 6 Valve shaft 7 Plastic ring 15 Inner peripheral surface (inner peripheral surface of valve housing)
16 circumferential groove 23 abutment 24 ring end 25 ring end 27 protruding piece 28 missing space 29 protruding piece 30 missing space 50 protruding piece 52 missing space

Claims (7)

A valve body that varies the opening of the fluid flow path, and a valve housing that rotatably accommodates the valve body,
In the valve device that forms a part of the fluid flow path by the inner peripheral surface of the valve housing and houses the valve body in the fluid flow path formed by the inner peripheral surface of the valve housing,
It has an annular resin ring,
On the inner periphery of the resin ring, there is provided a circumferential groove into which the outer peripheral edge of the valve body is fitted,
The valve body is accommodated in the fluid flow path in a state of being fitted in the circumferential groove,
The valve device is characterized in that the fluid passage is fully closed by rotating the valve body and bringing the outer periphery of the resin ring into annular contact with the inner peripheral surface of the valve housing. The valve device according to claim 1,
The resin ring is provided in a C shape so as to form a joint in a state where the valve body is fitted in the circumferential groove,
The two ring ends that form the joint include a protruding piece that protrudes in the circumferential direction from one ring end to the other ring end, and a missing space that is provided at the other ring end and accommodates the protruding piece. At least one projecting missing pair is formed,
A valve characterized in that the two ring ends form circumferentially abutting surface combinations that abut against each other in the circumferential direction at at least two different positions by accommodating the protruding piece in the missing space. apparatus. The valve device according to claim 2,
The valve device is characterized in that two or more protruding missing pairs are formed, and the circumferential contact surface combination is formed at three or more different positions. In the valve apparatus as described in any one of Claims 1 thru | or 3,
The valve body and the resin ring are heat-treated in a state of a subassembly in which an outer peripheral edge of the valve body is fitted in the circumferential groove. In the valve apparatus as described in any one of Claim 1 thru | or 4,
The resin ring has a valve device characterized in that the outer periphery has an annular shape other than a circle. In the valve apparatus as described in any one of Claim 1 thru | or 5,
A valve device, which is incorporated in an exhaust system of an engine and operates an exhaust gas passage amount. The valve device according to claim 6,
The valve body is attached to the valve body, is provided with a valve shaft that receives torque from a predetermined actuator and rotates together with the valve body,
The valve shaft is attached to the valve body so as to be substantially flush with the valve body, and intersects the resin ring at at least one portion in the circumferential direction of the resin ring,
A portion of the resin ring that intersects the valve shaft is provided with a concave shape so as to intersect while the valve shaft is fitted.

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