JP2020118239A - Seal ring - Google Patents

Abstract

To provide a seal ring which is prevented from falling of a spring.SOLUTION: A seal ring 30 used in a valve device 10 for opening and closing a passage 13 in which fluid flows, accommodated in the passage 13, and arranged at an external peripheral edge of a valve body 20 for opening and closing the passage by a turn comprises: a resin-made ring-shaped seal ring part 300 being a seal ring part having a groove 330 formed along a peripheral direction of the seal ring part at one side face 310 of the seal ring part; and a metal-made ring-shaped spring 400 arranged in the groove, and having a tensile force Fs by abutting on an inner wall face 333 of the groove at an external peripheral side. The groove has a structure in which a component Fsb of the tensile force progressing toward a direction of a bottom face 331 of the groove is imparted to the spring.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a seal ring of a valve device for opening and closing a passage through which a fluid flows.

2. Description of the Related Art Conventionally, there is known a valve device that opens and closes a passage through which a fluid flows by rotating a valve body housed in the passage. For example, in Patent Document 1, when the valve body is fully closed, a passage is provided by a resin-made seal ring fitted in a groove (hereinafter, also referred to as “circumferential groove”) provided along an outer peripheral edge of the valve body. There is disclosed a valve device having a seal structure for sealing a gap between the inner peripheral surface of the valve and the outer peripheral edge of the valve element.

JP, 2016-212678, A

However, when the tension of the seal ring decreases due to the creep of the resin generated by the high-temperature gas flowing in the passage, the seal ring presses the inner surface of the passage so that the pressure (““ (Also referred to as “sealing surface pressure”) may decrease, resulting in poor sealing.

Here, when focusing on ensuring the tension of the seal ring, it is conceivable to reinforce the seal ring by using a metal ring-shaped spring (hereinafter, also simply referred to as “spring”). As a method, for example, a method of forming a groove on the side surface of the seal ring and assembling the spring in the groove to form a reinforced seal ring can be considered.

In the case of the seal ring in which the spring is attached to the groove, there is a possibility that the spring may fall off the seal ring during the process of attaching the seal ring to the valve body. Further, when the valve body is opened from the fully closed state, there is a possibility that the spring may fall off the seal ring due to the pressure of the gas flowing into the circumferential groove.

The present disclosure can be realized as the following modes.

According to one aspect of the present disclosure, a valve body used for a valve device (10) that opens and closes a passage (13) through which a fluid flows, the valve body being housed in the passage (13) and opening and closing the passage by rotating. A seal ring (30, 30B, 30C, 30D, 30E, 30F) arranged on the outer peripheral edge of (20) is provided. This seal ring is a ring-shaped seal ring portion (300, 300B, 300D, 300E, 300F) made of resin, and is provided on one side surface (310) of the seal ring portion in the circumferential direction of the seal ring portion. A reel ring portion having grooves (330, 330B, 330D, 330E, 330F) provided along the groove, and an inner wall surface (333, 333B) arranged in the groove and located on the outer peripheral side of the groove to press the reel ring portion. A metal ring-shaped spring (400, 400C) having a tension (Fs), and the groove is configured such that a component force (Fsb) of the tension toward the bottom surface (331) of the groove is applied to the spring. It has a given structure.

According to the seal ring of this aspect, the spring is biased toward the bottom surface of the groove by the component force of the applied tension, and the spring is less likely to be displaced toward the opening side of the groove, so that the spring is prevented from falling off. It is possible.

The schematic sectional drawing which shows the structure of a valve device. The top view of the seal ring of 1st Embodiment. III-III sectional drawing of the seal ring of FIG. Sectional drawing which shows the state of the seal ring when a valve body is fully closed. Sectional drawing which shows another example of an inner wall surface. Sectional drawing which shows another example of a spring. Sectional drawing of the seal ring of 2nd Embodiment. Sectional drawing of the seal ring of 3rd Embodiment. The top view of the seal ring of 4th Embodiment. Explanatory drawing which shows an example of the manufacturing method of the seal ring of 1st Embodiment. The top view which shows an example of the lid type|mold of FIG. Explanatory drawing which shows another example of the manufacturing method of the seal ring of 1st Embodiment. Explanatory drawing which shows an example of the manufacturing method of the seal ring of 2nd Embodiment. The 1st explanatory view showing an example of the manufacturing method of the seal ring of a 3rd embodiment. The 2nd explanatory view showing an example of the manufacturing method of the seal ring of a 3rd embodiment. The 3rd explanatory view showing an example of the manufacturing method of the seal ring of a 3rd embodiment. The top view which shows an example of the lid type|mold in the manufacturing method of the seal ring of 4th Embodiment. FIG. 18 is a cross-sectional view of the lid type XVIII-XVIII of FIG. 17. FIG. 18 is a sectional view of the lid type XIX-XIX of FIG. 17.

A. The seal ring of the first embodiment:
The valve device 10 shown in FIG. 1 opens and closes the passage 12 through which gas flows by the rotational displacement of the valve body 20. The valve device 10 is, for example, incorporated in an exhaust system of an engine (not shown), and is applied to an EGR device that controls the passage amount of exhaust gas (hereinafter, also referred to as EGR gas) that is recirculated to the engine. That is, the valve device 10 returns the EGR gas from the exhaust passage of the engine mounted on the vehicle to the intake passage, and has a configuration as shown in FIG.

The valve device 10 includes a housing 11, a sensor case 14, and the like.

The housing 11 is made of metal, for example, die cast of aluminum alloy, and has a passage 12 through which EGR gas flows from the exhaust passage of the engine to the intake passage. On the inner wall of the passage 12, a member having excellent heat resistance and corrosion resistance, for example, a nozzle 13 made of stainless steel is arranged. That is, the inner circumference of the nozzle 13 serves as an inner wall of a part of the passage 12 and constitutes a part of the passage 12. Further, the housing 11 rotatably supports the valve body 20 that adjusts the opening degree of the passage 12, and houses a motor that rotates the valve body 20. The motor is not shown in the figure for easy understanding of the technique.

The valve body 20 is housed in the nozzle 13 so that the central axis thereof coincides with the central axis AX of the nozzle 13 as the passage 12. The valve body 20 is a disc-shaped butterfly valve that is rotatably supported in the valve body nozzle 13 via a shaft 15 and is capable of changing the opening area of the nozzle 13 according to the rotational displacement of the shaft 15. is there. That is, the valve body 20 adjusts the opening degree of the passage 12 by rotating integrally with the shaft 15. The valve body 20 is formed using various metals such as aluminum alloy and SUS, and various resins such as PPS, PTFE and PEEK.

The valve body 20 is rotated by the rotational torque amplified by the rotation of the motor being reduced by the combination of a plurality of gears. Specifically, by combining a motor gear (not shown) that rotates integrally with the motor, an intermediate gear (not shown) that is rotationally driven by this motor gear, and a final gear 16 that is rotationally driven by this intermediate gear. , The rotation of the motor is decelerated. Then, the shaft 15 rotates together with the final gear 16, and the valve body 20 rotates.

Further, the valve device 10 is provided with a return spring 17 that biases the valve body 20 only in the valve closing direction. The return spring 17 is a single spring composed of a coil spring wound only in one direction, and is coaxially arranged around the shaft 15. The return spring 17 is assembled between the housing 11 and the final gear 16 to generate a spring force that biases the return spring 17 toward the valve closing direction. That is, the final gear 16 and the like are rotating against the spring force of the return spring 17.

The sensor case 14 is made of resin and houses the sensor 18 that detects the rotation angle of the valve body 20. The sensor 18 is a non-contact position sensor that detects the opening angle of the valve body 20 by detecting the rotation angle of the shaft 15. Then, the flange of the housing 11 and the flange of the sensor case 14 are abutted and screwed together to integrate the housing 11 and the sensor case 14.

The outer peripheral edge 25 of the valve body 20 is provided with a groove 26 having a rectangular cross section (hereinafter, also referred to as “circumferential groove 26”, which will be described later with reference to FIG. 3) over the entire circumference. A seal ring 30 is fitted in the circumferential groove 26 to seal the gap between the inner peripheral surface 131 of the nozzle 13 and the outer peripheral edge 25 of the valve body 20 when the valve body 20 is fully closed.

As shown in the plan view of FIG. 2, the seal ring 30 has a seal ring portion 300 and a spring 400. The direction DR indicated by an arrow in FIG. 2 indicates a direction along the diameter of the seal ring 30 and the valve body 20 (see FIG. 1) (hereinafter, also referred to as “radial direction DR”). The direction DA of the arrow indicates a direction along the central axis AX (hereinafter, also referred to as “central axis direction DA”). The same applies to the following figures.

The seal ring portion 300 has a flat plate ring shape. The seal ring portion 300 is formed using, for example, a resin such as PPS, PTFE, PEEK. Note that FIG. 2 shows a state in which the seal ring 30 is viewed from the upstream side of the nozzle 13 (see FIG. 1 ), and one side surface 310 of the seal ring portion 300 corresponds to the “upstream side surface” and the opposite side surface. The side surface 320 of “corresponds to the side surface on the downstream side”.

The seal ring portion 300 is provided with an abutment 360 whose diameter can be expanded and contracted. Further, in the seal ring portion 300, as shown in the plan view of FIG. 2 and the sectional view of FIG. 3, a groove 330 along the circumferential direction is provided on one side surface 310. However, the groove 330 is provided outside the abutment 360 in the circumferential direction except for the region of the abutment 360.

A metal ring-shaped spring 400 is arranged in the groove 330. The cross section of the spring 400 along the radial direction DR is circular, as shown in FIG. As the metal material forming the spring 400, the rigidity of the seal ring portion 300 made of resin is maintained at a predetermined value or more, and a predetermined value is set toward the outer peripheral side in the radial direction DR of the seal ring portion 300. There is no particular limitation as long as it can have the above tension. As the metal material, for example, various metals such as aluminum alloy and SUS can be used. Hereinafter, the groove 330 is also referred to as a “spring groove 330”.

The seal ring 30 can be fitted into the circumferential groove 26 by separating the abutment 360 (see FIG. 2) and temporarily expanding it, arranging it in the circumferential groove 26 (see FIG. 1 and FIG. 4 described later), and then shrinking it.

In the cross-sectional view of FIG. 4, a portion of the seal ring 30 when the valve body 20 is fully closed (a portion corresponding to the III-III cross section of FIG. 2 shown in FIG. 3) is enlarged together with the valve body 20 and the nozzle 13. Is shown. The right side of FIG. 4 shows the upstream side of the nozzle 13 (described as “IN side”), and the left side thereof shows the downstream side of the nozzle 13 (described as “OUT side”).

As shown in FIG. 4, the seal ring 30 has a peripheral edge 350 of the seal ring portion 300 outside the peripheral groove 26 of the valve body 20, and an inner peripheral edge 340 thereof fits inside the peripheral groove 26. It is accommodated in the groove 26. Then, when the valve body 20 is fully closed, the outer peripheral edge 350 of the seal ring portion 300 in the region surrounded by the broken line frame Sca is tensioned Fs toward the outer peripheral direction of the spring 400 in the radial direction DR, and the inner peripheral surface 131 of the nozzle 13 is formed. Is pressed by. As a result, the outer peripheral edge 350 of the seal ring portion 300 comes into close contact with the inner peripheral surface 131 of the nozzle 13. Further, the seal ring portion 300 is pressed from the IN side to the OUT side due to the pressure difference between the IN side passage and the OUT side passage. As a result, the other side surface 320 of the seal ring portion 300 comes into close contact with the OUT side surface 263 of the circumferential groove 26 in the region surrounded by the broken line frame Scb. As a result, when the valve body 20 is fully closed, the gap between the inner peripheral surface 131 of the nozzle 13 and the outer peripheral edge 25 of the valve body 20 is sealed by the seal ring 30.

In addition, the tension Fs of the spring 400 is a magnitude that can press the seal ring portion 300 toward the outer peripheral side in the radial direction DR and bring it into close contact with the inner peripheral surface 131 of the nozzle 13 when the valve body 20 is fully closed. ..

Here, as shown in the cross-sectional view of FIG. 3, the dimension Lc of the opening of the spring groove 330 along the radial direction DR is along the radial direction DR so that the spring 400 can be arranged in the spring groove 330. The size of the outer shape of the spring 400, that is, the size equal to or larger than the diameter Lr is set. Further, the dimension Lb from the outer peripheral edge 350 of the seal ring portion 300 to the edge of the inner wall surface 333 on the bottom surface 331 side of the spring groove 330 is from the outer peripheral edge 350 to the edge of the inner wall surface 333 on the opening side of the spring groove 330. Is smaller than the dimension La. That is, the inner wall surface 333 has a flat surface inclined at an acute angle with respect to the bottom surface 331 along the radial direction DR. However, the entire surface of the inner wall surface 333 does not have to be a flat surface inclined at an acute angle, and at least the surface on which the spring 400 abuts may be inclined.

When the surface of the inner wall surface 333 with which the spring 400 abuts is inclined as described above, the following force is applied to the spring 400 by the tension Fs of the spring 400 toward the outer circumferential direction in the radial direction DR. That is, in the spring 400, the first component force Fsa, which is a component in the direction perpendicular to the surface of the inner wall surface 333 with which the spring 400 abuts, and the component in the direction perpendicular to the surface of the bottom surface 331 with which the spring 400 abuts. And a second component force Fsb. As a result, the spring 400 is biased in the direction of the bottom surface 331 by the second component force Fsb, so that the spring 400 is less likely to shift toward the opening side of the spring groove 330, and the spring 400 is prevented from coming off from the spring groove 330. It becomes possible to do.

The spring groove 330 has a structure in which the inner wall surface 333 has an inclined flat surface, but like the spring groove 330B of the seal ring portion 300B shown in FIG. 5, the inner wall surface 333B has a sloped curved surface. May be Also in the seal ring 30B having such a seal ring portion 300B, it is possible to suppress the fall of the spring similarly.

Although the spring 400 has a circular cross section along the radial direction DR, it may have a rectangular cross section as in the spring 400C shown in FIG. Also in the seal ring 30C having such a spring 400C, it is possible to prevent the spring from falling off similarly. Further, the shape of the spring is not limited to a circular or rectangular cross section, and may be an elliptical cross section. That is, as the spring, springs having various cross sections can be used. In this case as well, similarly, it becomes possible to prevent the spring from falling off.

Further, in the spring groove 330B (see FIG. 5) of the inner wall surface 333B having the inclined curved surface, springs having various shapes other than a circular cross section are arranged, such as the spring 400C (see FIG. 6) having a rectangular cross section. You may do it. In this case as well, similarly, it becomes possible to prevent the spring from falling off.

Further, although the seal ring 30 has been described as having the spring groove 330 provided on the side surface 310 of the seal ring portion 300 facing the upstream side, the spring groove 330 is provided on the side surface 320 of the seal ring portion 300 facing the downstream side. It may be configured.

In addition, the above-described deformation related to the shape of the inner wall surface on the outer peripheral side, the deformation related to the shape of the spring, and the deformation related to the direction in which the spring groove is provided can be similarly applied to the following embodiments.

B. Seal ring of the second embodiment:
The seal ring 30D of the second embodiment shown in the sectional view of FIG. 7 has a seal ring portion 300D having a spring groove 330D instead of the seal ring portion 300 having the spring groove 330 (see FIG. 3) of the first embodiment. Have Other configurations are the same as those of the seal ring of the first embodiment.

The spring groove 330D has an inner wall surface 333 on the outer peripheral side similar to the spring groove 330, an inner wall surface 332 on the inner peripheral side, and a bottom surface 331. As a result, the seal ring 30D of the second embodiment can also prevent the spring from falling off, as in the first embodiment. In particular, the spring groove 330D has a structure in which the dimension of the outer shape of the spring 400 in the radial direction DR, that is, the dimension Lc of the opening along the radial direction DR is smaller than the diameter Lr. This makes it possible to prevent the spring from falling off.

C. Seal ring of the third embodiment:
The seal ring 30E of the third embodiment shown in the sectional view of FIG. 8 has a seal ring portion 300E having a spring groove 330E instead of the seal ring portion 300 having the spring groove 330 (see FIG. 3) of the first embodiment. Have Other configurations are the same as those of the seal ring of the first embodiment.

The spring groove 330E has an inner wall surface 333 and a bottom surface 331 on the outer peripheral side similar to the spring groove 330. As a result, the seal ring 30E of the third embodiment can also prevent the spring from falling off, as in the first embodiment.

Further, in the spring groove 330E, the inner wall surface 332 (see FIG. 3) on the inner peripheral side of the spring groove 330 is a surface that is not inclined with respect to the central axis direction DA, whereas the inner wall surface 333 of the outer peripheral side is formed. It has an inner wall surface 332E that is inclined in the same direction with respect to the central axis direction DA at least equal to or greater than the inclination. Specifically, the dimension Lc of the opening along the radial direction DR is larger than the dimension Ld of the bottom surface 331 along the radial direction DR. Since the spring groove 330E having this dimensional relationship does not form a groove having a so-called undercut structure, it is possible to mold the seal ring portion 300E molded using resin using a simple mold structure. An example of a method for manufacturing the seal ring portion 300E having the spring groove 330E will be described later.

D. Seal ring of the fourth embodiment:
The seal ring 30F of the fourth embodiment shown in the plan view of FIG. 9 has a seal ring portion 300F having a spring groove 330F instead of the seal ring portion 300 having the spring groove 330 (see FIG. 2) of the first embodiment. Have Other configurations are the same as those of the seal ring of the first embodiment.

The spring groove 330F has a structure in which a plurality of first spring grooves 330F1 and a plurality of second spring grooves 330F2 are alternately provided, that is, a structure in which the second spring grooves 330F2 are intermittently provided. The second spring groove 330F2 has the same sectional structure as the spring groove 330E (see FIG. 8) of the third embodiment. Although illustration is omitted, the first spring groove 330F1 is different from the second spring groove 330F2 in that the inner wall surfaces on the inner peripheral side and the outer peripheral side are along the central axis direction DA, or an opening portion with respect to the central axis direction DA. It is a groove having a general cross-sectional structure that inclines inward from the side toward the bottom surface side. The number of the second spring grooves 330F2 is not limited to the seven shown in FIG. 9, and can be set to any number of two or more.

As described above, even if the structure partially includes the plurality of second spring grooves 330F2, the plurality of second spring grooves 330F2 can prevent the spring from falling off. An example of a method for manufacturing the seal ring portion 300F having the spring groove 330F will be described later.

In the above embodiment, the second spring groove 330F2 has been described as having the same sectional structure as the spring groove 330E of the third embodiment, but the present invention is not limited to this and other embodiments and modifications. The spring grooves 330, 330B, and 330D (see FIGS. 3, 5, and 7) may have the same sectional structure. Also in this case, the same effect can be obtained.

E. Manufacturing method of the seal ring of the first embodiment:
The seal ring portion 300 having the spring groove 330 of the first embodiment (see FIGS. 2 and 3) can be manufactured using, for example, the mold 60 having the structure shown in the cross-sectional view of FIG. 10. The mold 60 includes a box mold 61 having a ring-shaped accommodation space 610 and a lid mold 62 having a ring-shaped convex portion 620 corresponding to the spring groove 330. The accommodation space 610 excluding the convex portion 620 is a space corresponding to the seal ring portion 300 having the spring groove 330. The seal ring portion 300 can be manufactured by injecting a resin material that has been heated and melted into this space, and cooling and solidifying the resin material. Then, by disposing the spring 400 in the spring groove 330 of the manufactured seal ring portion 300, the seal ring 30 (see FIGS. 2 and 3) of the first embodiment can be manufactured.

Here, when the lid die 62 is released from the manufactured seal ring portion 300, since the spring groove 330 has an undercut structure, the protrusion 620 of the lid die 62 is released from the spring groove 330. Requires the inner wall surface 333 to be deformed. Therefore, the deformation may remain in the seal ring part 300 after the mold release.

In order to suppress the deformation, for example, as shown in FIG. 11, the lid mold 62 is divided into an inner peripheral side portion 631 and an outer peripheral side portion 632 of the convex portion 620, and the divided outer peripheral side portion 632 is further divided. It is possible to divide into a plurality of portions 632a and 632b along the circumferential direction and to combine these divided portions 631, 632a and 632b into one lid mold 62. With this configuration, for example, first, the inner peripheral side portion 631 can be released, and then the plurality of outer peripheral side portions 632a and 632b can be respectively shifted to the inner peripheral side and released. Accordingly, it is possible to suppress the deformation force applied to the inner wall surface 333 of the undercut structure of the spring groove 330, and release the lid mold 62 from the seal ring portion 300.

The seal ring portion 300 (see FIGS. 2 and 3) can also be manufactured by using the method shown in FIG. 12, for example.

First, a pre-molding seal ring portion 300pf is manufactured using a mold (not shown). As shown in the upper part of FIG. 12, the pre-molding seal ring part 300pf does not have the inner wall surface 333 on the outer peripheral side inclined like the spring groove 330 shown in FIG. The structure is such that the corresponding surface has an outer peripheral edge 350pf that is inclined outward. The pre-molding seal ring portion 300pf having this structure can be easily manufactured by using a mold (not shown) having a simple structure without forming an undercut structure.

Then, in a high temperature environment in which the resin used is plastically deformable, the pre-molding seal ring portion 300pf is fitted into the housing space 610 of the box 61 as shown in the upper stage of FIG. 12, and the state shown in the lower stage of FIG. Is maintained, the outer peripheral edge 350 pf side is plastically deformed, and then cooled. Thereby, the seal ring portion 300 having the spring groove 330 shown in FIG. 3 can be manufactured.

In the case of the method shown in FIG. 12, the seal ring portion 300 can be manufactured without causing deformation due to mold release.

F. Manufacturing method of the seal ring of the second embodiment:
The seal ring 30D of the second embodiment (see FIG. 7) can be manufactured using, for example, the method shown in FIG. This method is basically the same as the method of manufacturing the seal ring portion 300 shown in FIG.

In a high temperature environment in which the resin used is plastically deformable, as shown in the upper part of FIG. 13, the pre-molding seal ring portion 300Dpf in the state where the spring 400 is arranged in the pre-molding spring groove 330Dpf is housed in the box 61. It fits in the space 610 and plastically deforms the outer peripheral edge 350pf side as shown in the lower part of FIG. As a result, as shown in FIG. 7, the seal ring 30D in which the spring 400 is arranged in the spring groove 330D of the seal ring portion 300D can be manufactured.

G. Manufacturing method of the seal ring of the third embodiment:
The seal ring portion 300 having the spring groove 330E of the third embodiment (see FIG. 8) can be manufactured using, for example, the mold 60E having the structure shown in the cross-sectional view of FIG. The mold 60E has a box mold 61 and a lid mold 62E having a ring-shaped convex portion 620E corresponding to the spring groove 330E. The accommodation space 610 excluding the convex portion 620E becomes a space corresponding to the seal ring portion 300E having the spring groove 330E. According to this mold 60E, the seal ring portion 300E of the third embodiment can be manufactured. Then, by disposing the spring 400 in the spring groove 330E of the manufactured seal ring portion 300E, the seal ring 30E of the third embodiment (see FIG. 8) can be manufactured.

The release of the lid die 62E from the produced seal ring portion 300E is performed by expanding the produced seal ring portion 300E in the outer peripheral direction and shifting it away from the lid die 62E as shown in the cross-sectional view of FIG. To be executed. In order to facilitate the release of the seal ring portion 300E, as shown in FIG. 16, the inner wall surface 334 of the spring groove 330 on the side of the joint 360 is inclined so that the protrusion 620Ee of the lid mold 62E is formed. It may be inclined to. Further, this lid type structure can be similarly applied to the lid type of the seal ring of the other embodiments.

Note that the lid die 62E for producing the seal ring portion 300E of the third embodiment described above is also the same as the lid die 62 for producing the seal ring portion 300 of the first embodiment (FIG. 11), the lid mold 62E may be divided into a plurality of parts in the circumferential direction. With this configuration, the plurality of portions can be released from the inner circumferential side and in the direction away from the seal ring portion 300E. As a result, the seal ring portion 300E can be released from the mold without expanding, so that the deformation force applied to the seal ring portion 300E can be suppressed and the seal ring portion 300E can be released from the lid mold 62.

H. Manufacturing method of the seal ring of the fourth embodiment:
The seal ring portion 300F (see FIG. 9) having the spring groove 330F of the fourth embodiment is, for example, a box mold 61 (see FIG. 14) similar to that of the other embodiment, a plan view of FIG. 17, and FIGS. It can be manufactured using a mold 60F having a lid mold 62F having a structure shown in the cross-sectional view of FIG.

As shown in the plan view of FIG. 17 and the cross-sectional view of FIG. 19, the lid mold 62F basically has a ring-shaped first protrusion 620F1 corresponding to the first spring groove 330F1 (see FIG. 11). Have Then, as shown in FIG. 17, the lid mold 62F has a plurality of second protrusions corresponding to the plurality of second spring grooves 330F2 (see FIG. 11) so as to divide the first protrusion 620F1 along the circumferential direction. It has a section 620F2. As shown in the cross-sectional view of FIG. 18, the second convex portion 620F2 is configured to be attachable to and detachable from the lid mold 62F excluding the second convex portion 620F2.

According to the mold 60F, the seal ring portion 300F of the fourth embodiment can be manufactured. Then, by disposing the spring 400 in the spring groove 330F of the manufactured seal ring portion 300F, the seal ring 30F of the fourth embodiment (see FIG. 9) can be manufactured.

Here, the mold release of the lid mold 62F from the manufactured seal ring portion 300F is performed as follows. First, as shown in the cross-sectional view of FIG. 18, the respective second convex portions 620F2 are separated from each other on the inner peripheral side and in the direction away from the lid mold 62F. After that, the lid die 62F having the first convex portion 620F1 and the seal ring portion 300F are shifted in the directions away from each other and released. Accordingly, the deformation force applied to the seal ring portion 300F can be suppressed, and the seal ring portion 300F can be easily released from the lid mold 62F.

The seal ring of each of the embodiments described above has been described by way of example in the case of being used in the valve device applied to the EGR device, but the application target of the valve device is not limited to the EGR device, and various types are applicable. It may be a valve device that opens and closes a fluid passage. Is applicable to.

The present disclosure is not limited to the above-described embodiments, and can be realized with various configurations without departing from the spirit thereof. For example, the technical features of the embodiment corresponding to the technical features in each mode described in the column of the outline of the invention are to solve some or all of the above problems, or some of the above effects. Alternatively, in order to achieve all, it is possible to appropriately replace or combine. If the technical features are not described as essential in this specification, they can be deleted as appropriate.

10... Valve device, 13... Nozzle (passage), 20... Valve body, 21... Side surface of valve body, 30, 30B, 30C, 30D, 30E, 30F... Seal ring, 300, 300B, 300D, 300E, 300F Seal ring , 310, 320... Side surface of seal ring portion, 330... Spring groove, 331... Bottom surface, 333, 333B... Inner wall surface on outer peripheral side, 400, 400C... Spring, Fs... Tension, Fsb... Component force

Claims (5)

It is used in a valve device (10) that opens and closes a passage (13) through which a fluid flows, and is arranged in the outer peripheral edge of a valve body (20) that is housed in the passage (13) and that opens and closes the passage by rotation. Seal ring (30, 30B, 30C, 30D, 30E, 30F)
A ring-shaped seal ring part (300, 300B, 300D, 300E, 300F) made of resin, which is provided on one side surface (310) of the seal ring part along the circumferential direction of the seal ring part. A seal ring portion having grooves (330, 330B, 330D, 330E, 330F),
A metal ring-shaped spring (400, 400C) arranged in the groove and having a tension (Fs) for abutting and pressing the inner wall surface (333, 333B) on the outer peripheral side of the groove;
Equipped with
The seal ring is characterized in that the groove has a structure in which a component force (Fsb) of the tension toward the bottom surface (331) of the groove is applied to the spring. The seal ring according to claim 1,
The seal ring in which the inner wall surface (333, 333B) of the groove in the structure has a surface inclined at an acute angle with respect to the bottom surface of the groove along the radial direction of the seal ring portion. The seal ring according to claim 1 or 2, wherein
The size (Lc) of the opening of the groove (330E) along the radial direction of the seal ring part (300E) in the structure is equal to or larger than the size (Ld) of the bottom surface of the groove along the radial direction. Has a seal ring. The seal ring according to any one of claims 1 to 3,
A seal ring in which the dimension (Lc) of the opening of the groove along the radial direction of the seal ring portion (300D) in the structure is smaller than the dimension (Lr) of the outer shape of the spring along the radial direction. The seal ring according to any one of claims 1 to 4,
The seal ring, wherein the groove (330F) is provided with the structure (330F2) intermittently along the circumferential direction of the groove.

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