Seal structure

Abstract

To provide a seal member that is hardly detached from an annular groove capable of housing the seal member, in a seal structure comprising the seal member and the annular groove.SOLUTION: A seal structure comprises an annular seal member 22, and an annular groove 20 to which the seal member is fitted. The seal member comprises: a first contact part 64 formed linearly; and a second contact part 66 arranged radially outside the first contact part, and formed linearly. The first contact part is in contact along a first linear surface 581 of a first side wall 58 of the annular groove. The second contact part is in contact along a second linear surface 601 of a second side wall 60 arranged outside the first side wall.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a seal structure having a seal member and an annular groove capable of accommodating the seal member. [Background technology]

[0002] Patent Document 1 discloses a seal structure in which an annular seal member can be fitted to an annular groove. The seal member has a number of protrusions protruding radially outward and a number of recesses recessed radially inward relative to the protrusions. The protrusions and recesses are arranged alternately in the circumferential direction of the seal member. Each protrusion of the seal member contacts the radially outer groove circumferential surface of the annular groove, and each recess contacts the radially inner groove circumferential surface of the annular groove. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-127827 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the convex portion of the seal member is curved radially outward, and a part of the convex portion near the top of the convex portion contacts the radially outer peripheral surface of the groove. The concave portion of the seal member is curved radially inward, and a part of the concave portion near the top of the concave portion contacts the radially inner peripheral surface of the groove. The contact area of ​​the seal member that contacts the two peripheral surfaces of the groove is small relative to the circumferential length of the seal member. This causes a problem that the seal member is easily removed from the annular groove.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] One aspect of the present invention is a seal structure including an annular seal member and an annular groove in which the seal member is attached. The annular groove includes an annular first side wall and an annular second side wall disposed outward of the first side wall. The seal member includes a first abutment portion formed in a straight line, a second abutment portion disposed radially outward from the first abutment portion and formed in a straight line, and a connection portion connecting the first abutment portion and the second abutment portion to each other. The first abutment portion abuts along a first straight surface of the first side wall, and the second abutment portion abuts along a second straight surface of the second side wall. Effect of the Invention

[0007] According to the present invention, the first contact portion of the seal member contacts the first side wall along the first linear surface, and the second contact portion of the seal member contacts the second linear surface of the second side wall. This increases the contact area of ​​the seal member with the first side wall and the second side wall compared to a structure in which the curved convex and concave portions of the seal member contact the first side wall and the second side wall, thereby effectively preventing the seal member from coming off the annular groove. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an overall configuration diagram of an intake control device equipped with a seal structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view showing a cover member of the intake control device of FIG. [Diagram 3] FIG. 3 is an enlarged plan view of the seal structure in FIG. [Figure 4] Fig. 4A is a cross-sectional view taken along line IVA-IVA in Fig. 3. Fig. 4B is a cross-sectional view taken along line IVB-IVB in Fig. 3. [Diagram 5] FIG. 5 is an enlarged plan view of the seal member shown removed from the annular groove. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 1, the seal structure 10 according to this embodiment is provided in, for example, an apparatus 16 including a first member 12 having a first end 121 and a second member 14 having a second end 141 abutting the first end 121. In the seal structure 10, a seal member 22 is fitted in an annular groove 20 formed in either one of the first end 121 or the second end 141 in the apparatus 16. The apparatus 16 in which the seal structure 10 is provided is, for example, an intake control device 18 for controlling the amount of air supplied to an internal combustion engine.

[0010] Hereinafter, a case where the seal structure 10 is provided at the second end 141 of the second member 14 in the intake control device 18 will be described. Note that the device 16 is not limited to the intake control device 18. For example, the device 16 may be provided with a first member 12 having a first end 121 and a second member 14 having a second end 141 that abuts against the first end 121, and may have a configuration in which a seal member 22 is fitted in an annular groove 20 formed at either one of the first end 121 or the second end 141.

[0011] The intake control device 18 is connected to an intake manifold (not shown) mounted on a vehicle such as an automobile. The intake control device 18 includes a throttle body 24, a motor 26, a valve mechanism 30, a gear mechanism 32, a rotation detection mechanism 34, and a seal structure 10.

[0012] The throttle body 24 includes a first member 12 and a second member 14. The first member 12 is a main body 36. Hereinafter, the first member 12 will be referred to as the main body 36. The main body 36 includes first and second housing portions 381, 382 and an intake passage 40. The main body 36 has an opening 44 at a first end 121, which is one end of the main body 36 in the axial direction. An end face 421 of the first end 121 extends in a direction perpendicular to the axis of the throttle body 24. The opening 44 opens in the axial direction of the main body 36.

[0013] The first accommodating portion 381 extends in the axial direction of the main body 36. The first accommodating portion 381 communicates with the opening 44, and the first accommodating portion 381 accommodates the motor 26. The second accommodating portion 382 is provided at one end of the main body 36. The second accommodating portion 382 accommodates the gear mechanism 32 and a part of the rotation detection mechanism 34. The first and second accommodating portions 381, 382 communicate with the opening 44 in the axial direction of the throttle body 24.

[0014] The second member 14 is a cover member 46. Hereinafter, the second member 14 is referred to as the cover member 46. The cover member 46 has an annular second end 141 that abuts against the first end 121 of the throttle body 24. The second end 141 is formed in a shape corresponding to the first end 121 of the throttle body 24. An end face 461 of the second end 141 is a flat surface perpendicular to the axial direction of the throttle body 24. As shown in FIG. 2, when viewed from the axial direction of the throttle body 24, the second end 141 of the cover member 46 is formed in a substantially rectangular shape. As shown in FIG. 1, the second end 141 of the cover member 46 abuts against the first end 121 of the throttle body 24, thereby closing the opening 44 of the throttle body 24. The first and second housing portions 381 and 382 of the throttle body 24 are covered by the cover member 46. With the second end 141 in contact with the first end 121 of the main body 36 , the cover member 46 is fixed to the main body 36 .

[0015] The valve mechanism 30 includes a shaft 48 that is rotatably supported relative to the main body 36, and a disk-shaped valve element 28 that is fixed to the shaft 48. The valve element 28 is disposed in the intake passage 40.

[0016] The gear mechanism 32 includes a pinion gear 52 fixed to the motor 26, an intermediate gear 56 that meshes with the pinion gear 52, and a throttle gear 54 that meshes with the intermediate gear 56. The throttle gear 54 is connected to the shaft 48.

[0017] The seal structure 10 includes an annular groove 20 provided in a cover member 46 (second member 14 ) and a seal member 22 attached to the annular groove 20 .

[0018] The annular groove 20 is formed in the second end 141 of the cover member 46. As shown in FIG. 2, the annular groove 20 is formed along the second end 141. The annular groove 20 is annular and recessed in the end face 461 of the second end 141 (see FIG. 1). When the cover member 46 is viewed from the axial direction of the throttle body 24, the annular groove 20 is formed in a substantially rectangular shape. As shown in FIG. 1, when viewed from a direction perpendicular to the extending direction of the annular groove 20, the cross section of the annular groove 20 is rectangular. Note that the annular groove 20 is not limited to the configuration in which it is provided in the second end 141 of the cover member 46. For example, the annular groove 20 may be provided in the first end 121 (first member 12) of the body main body 36 facing the second end 141.

[0019] As shown in FIG. 1, the annular groove 20 includes a first side wall 58, a second side wall 60, and a bottom wall 62. As shown in FIG. 3, the first side wall 58 is disposed radially inward in the annular groove 20. The second side wall 60 is disposed radially outward of the first side wall 58 in the annular groove 20. The first side wall 58 and the second side wall 60 face each other. The distance between the first side wall 58 and the second side wall 60 is constant in the extending direction of the annular groove 20. Therefore, the groove width W of the annular groove 20 is constant along the extending direction of the annular groove 20. The groove width W is the distance between the first side wall 58 and the second side wall 60.

[0020] As shown in FIG. 2, the first side wall 58 includes a first straight surface 581 and a first curved surface 582. The first straight surface 581 is provided on a part of the first side wall 58. The first straight surface 581 is formed linearly along the extension direction of the first side wall 58. A plurality of first straight surfaces 581 are provided on the first side wall 58. Note that the number of first straight surfaces 581 is not limited to a case where a plurality of first straight surfaces 581 are provided. For example, the annular groove 20 may include one first straight surface 581. The first curved surface 582 connects two adjacent first straight surfaces 581 to each other. In a plan view of the cover member 46, the first curved surface 582 is formed in an arc shape.

[0021] The second side wall 60 includes a second linear surface 601 and a second curved surface 602. The second linear surface 601 is provided on a part of the second side wall 60. The second linear surface 601 is formed linearly along the extension direction of the second side wall 60. A plurality of second linear surfaces 601 are provided on the second side wall 60. The second linear surface 601 faces the first linear surface 581. The second linear surface 601 and the first linear surface 581 are provided in pairs. Note that the second linear surface 601 is not limited to a case where a plurality of second linear surfaces are provided. For example, the annular groove 20 may include one second linear surface 601. The second curved surface 602 connects two adjacent second linear surfaces 601 to each other. In a plan view of the cover member 46, the second curved surface 602 is formed in an arc shape. The second curved surface 602 faces the first curved surface 582. In this embodiment, there are four first and second straight surfaces 581, 601 and four first and second curved surfaces 582, 602. Note that the number of each of the first and second straight surfaces 581, 601 and the first and second curved surfaces 582, 602 is not limited to four. The number of each of the first and second straight surfaces 581, 601 and the first and second curved surfaces 582, 602 may be three or less, or five or more.

[0022] 4A, the bottom wall 62 is disposed perpendicular to the first and second side walls 58, 60 and parallel to the end surface 461 of the second end portion 141. The bottom wall 62 is disposed at a distance from the end surface 461 of the second end portion 141.

[0023] As shown in FIG. 1, when the cover member 46 is attached to the first end portion 121 of the body main body 36 , the annular groove 20 faces an end surface 421 of the first end portion 121 .

[0024] As shown in FIG. 2, the seal member 22 is formed in an annular shape from an elastic material. The seal member 22 has elasticity. As shown in FIG. 1, the seal member 22 is attached to the annular groove 20 of the cover member 46, and when the second end 141 of the cover member 46 and the first end 121 of the throttle body 24 abut against each other, the seal member 22 comes into contact with the first end 121. The opening 44 of the throttle body 24 is covered by the seal member 22. As shown in FIG. 2, the seal member 22 includes a first abutment portion 64, a second abutment portion 66, and a connection portion 68. In the extension direction of the seal member 22, the first abutment portion 64 and the second abutment portion 66 are disposed adjacent to each other.

[0025] As shown in FIG. 3, the first abutment portion 64 is formed linearly along the extension direction of the seal member 22. A plurality of first abutment portions 64 are provided along the extension direction of the seal member 22. The plurality of first abutment portions 64 are equally spaced apart from one another in the extension direction of the seal member 22. The first length L1 of each of the first abutment portions 64 in the extension direction of the seal member 22 is the same. Note that the first length L1 of each of the first abutment portions 64 is not limited to the same. The first length L1 of each of the first abutment portions 64 may be different. The first abutment portion 64 has a first abutment surface 641. The first abutment surface 641 abuts against the first linear surface 581 of the first side wall 58 in the annular groove 20 so as to be aligned along the first linear surface 581. The entire area of ​​the first abutment portion 64 along the extension direction of the first abutment portion 64 abuts against the first side wall 58 (first linear surface 581) in a linear manner.

[0026] The first contact portion 64 has a first contact end 642. The first contact end 642 is an end of the first contact portion 64 in the extension direction of the seal member 22.

[0027] The second abutting portion 66 is disposed radially outward of the first abutting portion 64 and is formed linearly along the extending direction of the seal member 22. A plurality of second abutting portions 66 are provided along the extending direction of the seal member 22. The plurality of second abutting portions 66 are equally spaced from each other in the extending direction of the seal member 22. The second length L2 of each second abutting portion 66 in the extending direction of the seal member 22 is the same. Note that the present invention is not limited to the case where the second lengths L2 of the respective second abutting portions 66 are the same. The second lengths L2 of the respective second abutting portions 66 may be different. The second length L2 of each second abutting portion 66 and the first length L1 of each first abutting portion 64 are the same (L2 = L1). Note that the present invention is not limited to the case where the first length L1 of the first abutting portion 64 and the second length L2 of the second abutting portion 66 are the same. For example, the first length L1 may be larger than the second length L2 (L2 < L1). The first length L1 may be smaller than the second length L2 (L2 > L1). The second abutting portion 66 has a second abutting surface 661. The second abutting surface 661 abuts along the second straight surface 601 of the second side wall 60 in the annular groove 20. The entire region of the second abutting portion 66 along the extending direction of the second abutting portion 66 abuts linearly against the second side wall 60 (second straight surface 601).

[0028] The second abutting portion 66 has a second abutting end 662. The second abutting end 662 is an end of the second abutting portion 66 in the extending direction of the seal member 22. In the extending direction of the seal member 22, each first abutting portion 64 among the plurality of first abutting portions 64 and each second abutting portion 66 among the plurality of second abutting portions 66 are alternately arranged.

[0029] The width T1 of the first abutting portion 64 in the direction orthogonal to the extending direction of the first abutting portion 64 and the width T2 of the second abutting portion 66 in the direction orthogonal to the extending direction of the second abutting portion 66 are the same. Note that the width T1 of the first abutting portion 64 and the width T2 of the second abutting portion 66 may be different.

[0030] The connecting portion 68 connects the first abutting end 642 of the adjacent first abutting portion 64 and the second abutting end 662 of the second abutting portion 66 to each other. That is, a plurality of connecting portions 68 are provided corresponding to the plurality of first abutting portions 64 and the plurality of second abutting portions 66. The widths T1 of the first abutting portion 64 and T2 of the second abutting portion 66 are larger than the width T3 of the connecting portion 68 in the direction orthogonal to the extending direction of the connecting portion 68 (T3 < T1, T3 < T2). The widths T1 of the first abutting portion 64 and T2 of the second abutting portion 66 are wider than the width T3 of the connecting portion 68. Note that the width T3 of the connecting portion 68 may be the same as the widths T1 of the first abutting portion 64 and T2 of the second abutting portion 66, or the width T3 of the connecting portion 68 may be larger than the widths T1 of the first abutting portion 64 and T2 of the second abutting portion 66.

[0031] In the extending direction of the seal member 22, the total abutting portion length, which is the sum of the first lengths L1 of the plurality of first abutting portions 64, and the second abutting portion length, which is the sum of the second lengths L2 of the second abutting portions 66, is larger than the total connecting portion length, which is the sum of the lengths L3 of the plurality of connecting portions 68. Note that it is not limited to the case where the total abutting portion length of the first and second abutting portions 64 and 66 is larger than the total connecting portion length of the connecting portion 68. The total abutting portion length may be smaller than the total connecting portion length.

[0032] As shown in FIGS. 4A and 4B, the seal member 22 includes an insertion end 70 that is inserted into the annular groove 20. When viewed from a direction orthogonal to the extending direction of the seal member 22, the insertion end 70 is formed in a tapered shape toward the insertion direction. The insertion direction of the seal member 22 is the direction from the end face 461 of the second end portion 141 toward the bottom wall 62 of the annular groove 20. Note that the insertion end 70 is not limited to being formed in a tapered shape toward the insertion direction. For example, the insertion end 70 may have an arc shape that is convex toward the insertion direction.

[0033] As shown in FIG. 5, when the seal member 22 is removed from the annular groove 20, the separation distance S between the first contact surface 641 and the second contact surface 661 in the direction perpendicular to the extension direction of the seal member 22 is larger than the groove width W of the annular groove 20 (W>S). As shown in FIG. 2, when the seal member 22 is attached to the annular groove 20, the first contact portion 64 and the second contact portion 66 are compressed so as to approach each other in the groove width direction of the annular groove 20. As shown in FIG. 3, the first contact portion 64 is pressed toward the second side wall 60 by the first side wall 58. The second contact portion 66 is pressed toward the first side wall 58 by the second side wall 60. As the first and second contact portions 64 and 66 are compressed, the connection portion 68 is compressed and deformed to be curved. The connection portion 68 is accommodated in the annular groove 20 in a curved state.

[0034] At this time, the elastic force of the seal member 22 is applied from the first contact portion 64 to the first side wall 58 (first linear surface 581). The elastic force of the seal member 22 is applied in a direction substantially perpendicular to the first linear surface 581. The elastic force of the seal member 22 is applied from the second contact portion 66 to the second side wall 60 (second linear surface 601). The elastic force of the seal member 22 is applied in a direction substantially perpendicular to the second linear surface 601. In other words, the direction in which the pressing force F1 from the seal member 22 is applied to the first side wall 58 is opposite to the direction in which the pressing force F2 from the seal member 22 is applied to the second side wall 60. Since the first length L1 of the first abutment portion 64 and the second length L2 of the second abutment portion 66 are the same, the pressing force F1 applied from the first abutment portion 64 to the first side wall 58 and the pressing force F2 applied from the second abutment portion 66 to the second side wall 60 are approximately the same.

[0035] This embodiment provides the following advantages.

[0036] As shown in Fig. 3, the seal structure 10 includes an elastic annular seal member 22 and an annular groove 20 formed at one of the first end 121 and the second end 141 of the device 16 and in which the seal member 22 is attached. The seal member 22 includes a first abutment portion 64 formed linearly, a second abutment portion 66 arranged radially outward of the first abutment portion 64 and formed linearly, and a connection portion 68 connecting the adjacent first abutment portion 64 and second abutment portion 66 to each other. The annular groove 20 includes an annular first side wall 58, an annular second side wall 60 arranged outward of the first side wall 58, a first linear surface 581 formed linearly along the extension direction of the first side wall 58, and a second linear surface 601 formed linearly along the extension direction of the second side wall 60. The first abutment portions 64 and the second abutment portions 66 are arranged alternately, with the first abutment portions 64 abutting along the first linear surface 581 of the first side wall 58, and the second abutment portions 66 abutting along the second linear surface 601 of the second side wall 60.

[0037] According to this configuration, the first contact portion 64 of the seal member 22 contacts along the first linear surface 581 of the first side wall 58, and the second contact portion 66 contacts along the second linear surface 601 of the second side wall 60. This increases the contact area of ​​the seal member 22 with the first side wall 58 and the second side wall 60 compared to a structure in which the curved convex and concave portions of the seal member contact the first and second side walls. Therefore, the seal member 22 can be effectively prevented from coming off from the annular groove 20.

[0038] In a direction perpendicular to the extension direction of the seal member 22, the width T1 of the first abutment portion 64 and the width T2 of the second abutment portion 66 are larger than the width T3 of the portion of the seal member 22 (connection portion 68) excluding the first and second abutment portions 64, 66.

[0039] This ensures the strength of the first and second abutment portions 64, 66 compared to the portion of the seal member 22 (connection portion 68) excluding the first and second abutment portions 64, 66, thereby suppressing deformation of the first and second abutment portions 64, 66 when the seal member 22 is attached to the annular groove 20. The elastic deformation of the portion of the seal member 22 (connection portion 68) allows the first and second abutment portions 64, 66 to be effectively pressed against the annular groove 20.

[0040] 4A, the seal member 22 has an insertion end 70 that is inserted into the annular groove 20, and in a cross section of the seal member 22 perpendicular to the extension direction of the seal member 22, the insertion end 70 is tapered toward the insertion direction into the annular groove 20. This can improve the ease of inserting the seal member 22 into the annular groove 20. Even when the insertion end 70 is tapered, the first and second abutment portions 64, 66 effectively prevent the seal member 22 from coming off from the annular groove 20.

[0041] 3, in the extension direction of the seal member 22, a first length L1 of the first contact portion 64 and a second length L2 of the second contact portion 66 are the same. By balancing the pressing force F1 (elastic force) applied from the first contact portion 64 to the first side wall 58 (first linear surface 581) and the pressing force F2 (elastic force) applied from the second contact portion 66 to the second side wall 60 (second linear surface 601), it is possible to more effectively suppress the seal member 22 from coming off from the annular groove 20.

[0042] 5, when the seal member 22 is removed from the annular groove 20, the separation distance S between the first abutment surface 641 and the second abutment surface 661 is larger than the groove width W, which is the distance between the first linear surface 581 (first side wall 58) and the second linear surface 601 (second side wall 60). When the seal member 22 is attached to the annular groove 20, the connection portion 68 is curved. As a result, when the sealing member 22 is attached to the annular groove 20, the first straight surface 581 and the second straight surface 601 cause the first abutment portion 64 and the second abutment portion 66 to elastically deform in a direction approaching each other, and the connection portion 68 deforms in a curved manner, thereby effectively pressing the sealing member 22 against the annular groove 20 to make tight contact.

[0043] In the seal structure 10, the first contact portion 64 of the seal member 22 linearly contacts the first side wall 58 of the annular groove 20, and the second contact portion 66 of the seal member 22 linearly contacts the second side wall 60 of the annular groove 20. According to this configuration, the first contact portion 64 formed in a straight line is linearly contacted with the first side wall 58 of the annular groove 20, and the second contact portion 66 formed in a straight line is linearly contacted with the second side wall 60 of the annular groove 20. As a result, the contact area of ​​the seal member 22 with the annular groove 20 can be increased compared to a structure in which the curved convex and concave portions of the seal member 22 contact the first side wall 58 and the second side wall 60, and therefore removal of the seal member 22 from the annular groove 20 can be effectively suppressed.

[0044] In addition to the above disclosure, the following notes are also disclosed.

[0045] (Appendix 1) The seal structure (10) is provided in a device (16) including an elastic annular seal member (22), a first member (12) having a first end (121), and a second member (14) having a second end (141) abutting against the first end of the first member and fixed to the first member, and includes an annular groove (20) formed in one of the first end and the second end and in which the seal member is attached. The annular groove has an annular first side wall (58), an annular second side wall (60) disposed outwardly of the first side wall and facing the first side wall, a first linear surface (581) provided in a part of the first side wall and linearly formed along the extension direction of the first side wall, and a second linear surface (601) provided in a part of the second side wall and linearly formed along the extension direction of the second side wall. The sealing member comprises a first abutment portion (64) formed in a straight line, a second abutment portion (66) arranged radially outward from the first abutment portion and formed in a straight line, and a connection portion (68) connecting adjacent first and second abutment portions to each other, at least one of the first abutment portion and the second abutment portion is provided in a plurality of positions in the extension direction of the sealing member, and the first abutment portion and the second abutment portion are provided alternately, the first abutment portion abuts along the first straight surface of the first side wall, and the second abutment portion abuts along the second straight surface of the second side wall.

[0046] According to this configuration, the first contact portion of the seal member contacts along the first linear surface of the first side wall, and the second contact portion contacts along the second linear surface of the second side wall. This increases the contact area of ​​the seal member with the first side wall and the second side wall compared to a structure in which the curved convex and concave portions of the seal member contact the first side wall and the second side wall, thereby effectively preventing the seal member from coming off the annular groove.

[0047] (Appendix 2) In the seal structure described in Appendix 1, the width (T1) of the first contact portion and the width (T2) of the second contact portion may be larger than the width (T3) of the portion of the seal member excluding the first and second contact portions in a direction perpendicular to the extension direction of the seal member. With this configuration, the strength of the first and second contact portions can be ensured compared to the portion of the seal member excluding the first and second contact portions, so that deformation of the first and second contact portions when the seal member is attached to the annular groove can be suppressed. The portion of the seal member excluding the first and second contact portions elastically deforms, so that the first and second contact portions can be effectively pressed against the annular groove.

[0048] (Appendix 3) In the seal structure described in Supplementary Note 1 or 2, the seal member has an insertion end (70) to be inserted into the annular groove, and in a cross section of the seal member perpendicular to the extension direction of the seal member, the insertion end may be tapered toward the insertion direction into the annular groove. This configuration can improve the ease of inserting the seal member into the annular groove. Even if the insertion end is tapered, the first and second abutment portions effectively prevent the seal member from coming off from the annular groove.

[0049] (Appendix 4) In the seal structure described in Appendix 2, a first length (L1) of the first contact portion and a second length (L2) of the second contact portion in the extension direction of the seal member may be the same. With this configuration, the elastic force applied from the first contact portion to the first side wall (first linear surface) and the elastic force applied from the second contact portion to the second side wall (second linear surface) are balanced, so that the seal member can be more effectively prevented from coming off from the annular groove.

[0050] (Appendix 5) In the seal structure described in Supplementary Note 1, the first abutment portion has a first abutment surface (641) that abuts on the first linear surface, the second abutment portion has a second abutment surface (661) that abuts on the second linear surface, and when the seal member is removed from the annular groove, a separation distance (S) between the first abutment surface and the second abutment surface is large relative to a groove width (W) that is a distance between the first linear surface and the second linear surface, and when the seal member is attached to the annular groove, the connection portion may be curved. According to this configuration, when the seal member is attached to the annular groove, the first abutment portion and the second abutment portion are elastically deformed in a direction approaching each other by the first linear surface and the second linear surface, and the connection portion is deformed to be curved, so that the seal member can be effectively pressed against the annular groove to be in close contact.

[0051] (Appendix 6) The sealing structure, in a device including an elastic annular sealing member, a first member having a first end, and a second member having a second end abutting the first end of the first member and fixed to the first member, includes an annular groove formed in one of the first end or the second end and into which the sealing member is attached. The annular groove has an annular first side wall and an annular second side wall disposed outwardly of the first side wall and facing the first side wall. The sealing member comprises a first abutment portion formed in a straight line, a second abutment portion arranged radially outward from the first abutment portion and formed in a straight line, and a connecting portion connecting adjacent first abutment portion and second abutment portion to each other, at least one of the first abutment portion and the second abutment portion is provided in multiples in the extension direction of the sealing member, and the first abutment portion and the second abutment portion are provided alternately, the first abutment portion abuts against the first side wall in a straight line, and the second abutment portion abuts against the second side wall in a straight line.

[0052] According to this configuration, the first contact portion formed in a straight line contacts the first side wall of the annular groove in a straight line, and the second contact portion formed in a straight line contacts the second side wall of the annular groove in a straight line. This increases the contact area of ​​the seal member with the annular groove compared to a structure in which the curved convex and concave portions of the seal member contact the first and second side walls, and effectively prevents the seal member from coming off the annular groove.

[0053] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0054] 10...seal structure 12...first member 121...first end portion 14...second member 141...second end portion 16...device 18...intake control device 20...annular groove 22...seal member 58...first side wall 581...first straight surface 60...second side wall 601...second straight surface 64...first contact portion 66...second contact portion 68...connection portion

Claims

1. an annular elastic seal member; In an apparatus including a first member having a first end and a second member having a second end abutting the first end of the first member and fixed to the first member, the apparatus further comprising: an annular groove formed in one of the first end and the second end, in which the seal member is fitted; A seal structure comprising: The annular groove has an annular first sidewall and a second annular side wall disposed outside the first side wall and facing the first side wall; a first linear surface provided on a portion of the first side wall and formed linearly along an extension direction of the first side wall; a second linear surface provided on a portion of the second side wall and formed linearly along an extension direction of the second side wall; having The seal member has a first contact portion formed in a straight line, A second contact portion is disposed radially outward from the first contact portion and formed linearly; a connection portion connecting the first contact portion and the second contact portion adjacent to each other; Equipped with At least one of the first contact portion and the second contact portion is provided in a plurality of portions in the extending direction of the seal member, and the first contact portions and the second contact portions are provided alternately, the first contact portion contacts along the first linear surface of the first side wall, A seal structure, wherein the second abutment portion abuts along the second linear surface of the second side wall.

2. The seal structure according to claim 1, A seal structure, wherein in a direction perpendicular to the extension direction of the seal member, the width of the first abutment portion and the width of the second abutment portion are greater than the width of a portion of the seal member excluding the first and second abutment portions.

3. The seal structure according to claim 1 or 2, the seal member has an insertion end that is inserted into the annular groove, A seal structure, wherein in a cross section of the seal member perpendicular to the extension direction of the seal member, the insertion end is formed tapered toward the insertion direction into the annular groove.

4. The seal structure according to claim 2, A seal structure, wherein a first length of the first abutment portion and a second length of the second abutment portion are the same in the extension direction of the seal member.

5. The seal structure according to claim 1, The first contact portion has a first contact surface that contacts the first linear surface, The second contact portion has a second contact surface that contacts the second linear surface, When the seal member is removed from the annular groove, a distance between the first contact surface and the second contact surface is larger than a groove width between the first linear surface and the second linear surface, A seal structure, wherein the connection portion is curved with the seal member attached to the annular groove.

6. an annular elastic seal member; In an apparatus including a first member having a first end and a second member having a second end abutting the first end of the first member and fixed to the first member, the apparatus further comprising: an annular groove formed in one of the first end and the second end, in which the seal member is fitted; A seal structure comprising: The annular groove has an annular first sidewall and a second annular side wall disposed outside the first side wall and facing the first side wall; having The seal member has a first contact portion formed in a straight line, A second contact portion is disposed radially outward from the first contact portion and formed linearly; a connection portion connecting the first contact portion and the second contact portion adjacent to each other; Equipped with At least one of the first contact portion and the second contact portion is provided in a plurality of portions in the extending direction of the seal member, and the first contact portions and the second contact portions are provided alternately, The first contact portion is in linear contact with the first side wall, The second contact portion contacts the second side wall in a linear manner.

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