JP2016217522A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently secure a seal function even between fastening parts.SOLUTION: An annular seal material 7 is housed in a seal groove 5. Since on a surface 1b of a case 1 including a seal groove 5, a flange 11 of a pipeline 9 is fastened and fixed by using a bolt 13 so as to cover the seal groove 5. By fastening and fixing the bolt 13, the seal material 7 is compressed, and an internal cooling water passage 1a is formed. In the vicinity of a fastening part including a screw hole 15 to which the bolt 13 is fastened, on the outer peripheral side of the seal material 7, provided is a projection part 7a contacting with an outside wall part 5b of the seal groove 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seal structure that seals an internal space with a seal material accommodated in a seal groove.

  In Patent Document 1, an O-ring serving as a sealing material is accommodated in an annular seal groove provided in one flange portion of a flange joint, and a pair of flange portions are abutted with each other to compress the O-ring. Sealing the space is disclosed.

Japanese Utility Model Publication No. 3-4971

  By the way, a fastener such as a bolt may be used when the pair of flange portions are fixed to each other. In that case, the compression force (pressing force) with respect to the O-ring is weaker between the fasteners fastened at a plurality of locations at regular intervals along the seal groove than in the vicinity of the fastening portion. For this reason, between the fastening parts, the compression amount of the O-ring becomes insufficient and the sealing function is lowered.

  Accordingly, an object of the present invention is to ensure a sufficient sealing function even between the fastening portions.

  In the present invention, the sealing material includes a position restricting portion that contacts at least one of the inner wall portion and the outer wall portion in the seal groove. The position restricting portion restricts the position in the groove width direction of the seal groove of the seal material, and includes a first member including the seal groove and a second member that compresses the seal material between the first member and the first member. It is located in the vicinity of the fastening part by the fastener which fastens.

  According to the present invention, the position of the sealing material in the seal groove is restricted by the position restricting portion, so that the shift in the groove width direction in the seal groove can be suppressed. As a result, the sealing material can be more securely adhered to the outer wall portion of the seal groove when compressed, even between the fastening portions where the force to be compressed is weak, and a sufficient sealing function can be secured. At that time, since the position restricting portion is provided in the vicinity of the fastening portion so as to be in contact with at least one of the inner wall portion and the outer wall portion of the seal groove and to be hard to be compressed as compared with other portions, the sealing material It is possible to maintain the sealing function by securing a stronger reaction force.

It is a top view of a case which shows the state which accommodated the O-ring in the seal groove of the seal structure concerning the 1st Embodiment of this invention. It is sectional drawing including the cover corresponding to the AA line of FIG. 1 which shows the seal structure concerning 1st Embodiment. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a top view of the case corresponding to FIG. 1 of the seal structure concerning the 2nd Embodiment of this invention. It is sectional drawing containing the cover corresponding to the EE line | wire of FIG. It is an enlarged view of the D section of FIG. It is an enlarged view corresponding to FIG. 7 which shows the seal structure concerning the 3rd Embodiment of this invention. It is an enlarged view corresponding to FIG. 7 which shows the seal structure concerning the 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a seal structure according to a first embodiment of the present invention. A cooling water passage 1a as an internal space is formed inside the case 1 as the first member. The cooling water passage 1a is circular as shown in FIG. Although not shown, the case 1 is mounted with an electronic component or the like that is cooled by the cooling water passing through the cooling water passage 1a.

  An annular sealing groove 5 is provided on the surface 1b of the case 1 so as to surround the periphery of the cooling water passage 1a, and a sealing material 7 formed of an O-ring is accommodated in the sealing groove 5.

  A pipe 9 as a second member is attached and fixed to the surface 1b of the case 1 having the seal groove 5 so as to cover the seal groove 5. The cooling water passage 9 a in the pipe 9 communicates with the cooling water passage 1 a of the case 1. The pipe 9 includes an annular flange 11, and the flange 11 is fastened and fixed to the surface 1 b of the case 1 using a bolt 13 as a fastener. A plurality of bolts 13 (four in this case) are provided at equal intervals along the circumferential direction.

  Therefore, as shown in FIG. 1, four screw holes 15 are formed on the surface 1 b of the case 1 at equal intervals along the circumferential direction outside the seal groove 5. A bolt insertion hole 11 a into which the bolt 13 is inserted is formed in the flange 11 corresponding to the screw hole 15. FIG. 1 shows a state in which the seal material 7 is only accommodated in the seal groove 5, the pipe 9 is not attached to the case 1, and therefore the seal material 7 is in a natural state and is not compressed.

  The sealing material 7 has a substantially circular cross section as shown in FIG. 3 which is a BB cross sectional view of FIG. 1 in the natural state. The diameter d of the sealing member 7 having a circular cross section is smaller than the width W of the sealing groove 5 and larger than the depth H. That is, H <d <W.

  For this reason, as shown in FIG. 3, in a state where the sealing material 7 is accommodated in the sealing groove 5 so that the center of the sealing material 7 coincides with the center of the width W of the sealing groove 5, the sealing material 7 has the sealing groove 5. Between the inner wall portion 5a and the outer wall portion 5b, substantially equal gaps Sa and Sb are formed, respectively. At this time, a part of the sealing material 7 protrudes from the surface 1 b of the case 1.

  As shown in FIG. 4, which is a cross-sectional view taken along the line CC of FIG. 1, the sealing material 7 includes a convex portion 7 a as a position restricting portion in the vicinity of the screw hole 15, in other words, in the vicinity of the fastening portion by the bolt 13. ing. The convex portion 7a is provided integrally on the outer peripheral side of the sealing material 7, protrudes toward the outer wall portion 5b of the seal groove 5, and the tip is in contact with the outer wall portion 5b.

  In FIG. 1, the convex portion 7 a is located on the shortest distance line between the screw hole 15 corresponding to the fastening portion by the bolt 13 and the cooling water passage 1 a of the case 1. In other words, in FIG. 1, the convex portion 7a is located on a straight line connecting the center of the bolt 13 and the screw hole 15 in the fastening state and the center of the cooling water passage 1a having a circular cross section. Further, the straight line passes through the center of the width of the convex portion 7a (the width along the circumferential direction of the sealing material 7).

  As shown in FIG. 1, in a state where the sealing material 7 is accommodated and set in the seal groove 5, the tips of the four convex portions 7 a come into contact with the outer wall portion 5 b of the seal groove 5. At this time, the sealing material 7 has a gap Sa between the outer wall 5b and the outer wall 5b except for the convex portion 7a on the outer circumference, and the inner wall 5a is annular between the inner circumference and the entire circumference. The gap Sb is formed.

  In this state, as shown in FIG. 2, the flange 11 of the pipe 9 is fastened and fixed to the surface 1 b of the case 1 by four bolts 13. By fastening the bolt 13, the sealing material 7 is compressed and elastically deformed between the bottom surface 5 c of the sealing groove 5 and the end surface 11 b of the flange 11. The sealing material 7 moves to the outside between the bolt fastening portions with less compression due to the pressure increase in the flow paths (cooling water passages 1a and 9a), and the outer peripheral side forming the gap Sa is in close contact with the outer wall portion 5b. At the same time, it comes into close contact with the end surface 11b of the flange 11 and exhibits a sealing function due to a self-sealing effect.

  The clearance Sa on the outer peripheral side of the seal material 7 is substantially uniform over the entire circumference of the seal groove 5 by providing the seal material 7 with the four convex portions 7a. That is, the seal material 7 is suppressed from being displaced in the groove width direction in the seal groove 5. For this reason, if the dimension of each part is set so that the space | gap Sa may contact | adhere the outer peripheral side of the sealing material 7 after internal pressure (pressure in a flow path) is applied, the sealing material 7 will be a bolt fastening part (convex part). 7a) It spreads to the outside so as to fill the uniform gap Sa in the portion other than the vicinity, and is in close contact with the outer wall 5b, so that the sealing function can be ensured over the entire circumference.

  On the other hand, when the sealing material not provided with the convex portion 7 a is accommodated and set in the seal groove 5, the seal material may be shifted in the groove width direction in the seal groove 5. In the case of deviation, the outer peripheral side of the shifted side of the sealing material contacts the outer wall portion 5b of the seal groove 5, and the outer peripheral side opposite to the shifted side is greatly separated from the outer wall portion 5b of the seal groove 5. Become. The side of the sealing material that is far away from the outer wall portion 5b may not come into contact with the outer wall portion 5b even when internal pressure (pressure in the flow path) is applied, leading to a reduction in the sealing function.

  The fastening force by the bolt 13 becomes weaker in proportion to the distance from the bolt fastening point. That is, the fastening force by the bolt 13 is the weakest at the center between the bolt fastening portions. Further, at the center between the bolt fastening portions, the deformation of the flange 11 is the largest due to the reaction force of the pressing force against the sealing material 7 at the time of bolt fastening. That is, between the bolt fastening portions, the pressing force (compression force) against the sealing material 7 becomes weaker as the distance from the bolt fastening portion increases.

  In the present embodiment, the sealing material 7 can be in close contact with the outer wall portion 5b even between the bolt fastening portions where the pressing force against the sealing material 7 is weak as described above, thereby ensuring the sealing performance. At that time, the pressing force is applied to the sealing material 7 by providing the sealing material 7 in the vicinity of the bolt fastening portion with a strong pressing force against the sealing material 7 in a state where the convex portion 7a serving as the position restricting portion is in contact with the outer wall portion 5b. It can be transmitted efficiently.

  Since the convex portion 7a of the sealing material 7 comes into contact with the outer wall portion 5b of the sealing groove 5 and its movement is restricted, the periphery of the portion including the convex portion 7a of the sealing material 7 is compressed as compared with other portions. Hateful. Moreover, since the part provided with the convex part 7a of the sealing material 7 has a large cross-sectional area compared with another part, it is hard to be compressed. By fastening the vicinity of the portion of the sealing material 7 that is difficult to be compressed with the bolt 13, the reaction force of the sealing material 7 can be secured more strongly, and the sealing function can be maintained.

  If the bolt fastening portion is at a position away from the convex portion 7a of the sealing material 7, the pressing force on the vicinity of the convex portion 7a which is difficult to be compressed becomes insufficient, and the sealing function around the convex portion 7a is deteriorated.

  In this embodiment, in order to ensure a sufficient sealing function, it is not necessary to increase the number of fastening portions by the bolts 13 or increase the rigidity of the pipe 9 (flange 11), thereby suppressing an increase in cost.

  In the present embodiment, the sealing material 7 is provided with a convex portion 7 a serving as a position regulating portion that regulates the position of the sealing material 7 with respect to the seal groove 5. For this reason, manufacture is easy compared with the case where the convex part used as a position control part is provided in the seal groove 5, and a cost increase can be suppressed.

  In the present embodiment, the position restricting portion is constituted by a convex portion 7 a that protrudes toward the outer wall portion 5 b in the seal groove 5. For this reason, the position restricting portion can be easily provided by simply integrally forming the convex portion 7 a on the sealing material 7.

  In addition, the convex part used as a position control part may protrude toward the inner wall part 5a in the seal groove 5, and protrudes toward both the inner wall part 5a and the outer wall part 5b. There may be. In other words, the position restricting portion only needs to protrude toward at least one of the inner wall portion 5a and the outer wall portion 5b in the seal groove 5.

  In this embodiment, the convex portion 7 a of the sealing material 7 is located on the shortest distance line between the fastening portion by the bolt 13 and the cooling water passage 1 a in the case 1. In this case, since the convex portion 7 a is provided at a position closest to the fastening portion by the bolt 13, the pressing force can be more efficiently transmitted to the sealing material 7.

  5 to 7 show a seal structure according to the second embodiment of the present invention. In the second embodiment, as shown in FIG. 5, the cooling water passage 1Aa of the case 1A is rectangular. For this reason, a rectangular seal groove 5A is provided on the surface 1Ab of the case 1A so as to surround the periphery of the cooling water passage 1Aa, and the rectangular seal material 7A is accommodated in the seal groove 5A.

  As shown in FIG. 6, the end surface 11Ab of the flange 11A of the pipe 9A is brought into contact with the surface 1Ab of the case 1A, and is fastened and fixed by the bolts 13. A cooling water passage 9Aa is formed in the pipe 9A. The fastening portions by the bolts 13 are set at six locations in total, two corners of the rectangular seal groove 5A and two locations in the longitudinal direction of the long side portion long in the left-right direction in FIG. That is, as shown in FIG. 5, the screw holes 15A to which the bolts 13 are fastened are formed at a total of six locations along the seal grooves 5A.

  The four corners of the seal groove 5A are both curved on the inner wall 5Aa and the outer wall 5Ab, and the inner and outer sides of the four corners of the sealing material 7A are both curved according to the curved surface. Is formed.

  The cross-sectional shape of the seal groove 5A and the cross-sectional shape of the sealing material 7A in the portion excluding the four corners are the same as those in the first embodiment shown in FIG. The mutual dimensional relationship between the seal groove 5A and the seal material 7A is the same as that of the first embodiment shown in FIG.

  On the outer peripheral side of the four corners of the sealing material 7A, convex portions 7Aa are provided as position restricting portions. As shown in FIGS. 5 and 7, the convex portion 7Aa contacts the outer wall portion 5Ab of the portion where the tip is a curved surface of the sealing groove 5A when the sealing material 7A is set in the sealing groove 5A. .

  For this reason, as shown in FIG. 7, the sealing material 7A in the state of FIG. 5 has a gap SAa formed between the outer wall portion 5Ab and the portion excluding the convex portion 7Aa on the outer peripheral side. Is formed with a gap SAb between the inner wall portion 5Aa and the entire circumference.

  Thus, also in 2nd Embodiment, the clearance gap SAa is substantially equalized over the perimeter of the seal groove 5A, when the sealing material 7A is provided with the four convex parts 7Aa. That is, the seal material 7A is suppressed from being displaced in the groove width direction in the seal groove 5A. For this reason, if the clearance SAa is set so that the outer peripheral side of the sealing material 7A can be brought into close contact after the internal pressure (pressure in the flow path) is applied, the sealing material 7A excludes the vicinity of the bolt fastening portion (convex portion 7Aa). In the portion, it spreads outward and is in close contact with the outer wall 5Ab, and a sealing function can be ensured over the entire circumference.

  For this reason, as in the first embodiment, a sufficient sealing function can be secured even between the fastening portions where the pressing force against the sealing material 7A is weaker than that of the fastening portion by the bolt 13. Also in this embodiment, in order to ensure a sufficient sealing function, it is not necessary to increase the fastening portion by the bolts 13 or increase the rigidity of the pipe 9A, and the cost increase can be suppressed.

  In the present embodiment, as in the first embodiment, the sealing material 7A can be brought into close contact with the outer wall portion 5Ab even between the bolt fastening portions having a weak pressing force against the sealing material 7A, thereby ensuring the sealing performance. . At that time, the pressing force is applied to the sealing material 7A by providing the sealing material 7A in the vicinity of the bolt fastening portion with a strong pressing force against the sealing material 7A in a state where the convex portion 7Aa serving as the position regulating portion is in contact with the outer wall portion 5Ab. It can be transmitted efficiently.

  Since the convex portion 7Aa of the sealing material 7A comes into contact with the outer wall portion 5Ab of the sealing groove 5A and the movement is restricted, the periphery of the portion including the convex portion 7Aa of the sealing material 7A is compressed compared to the other portions. Hateful. Further, the portion of the sealing material 7A that includes the convex portion 7Aa is difficult to be compressed because it has a larger cross-sectional area than the other portions. Furthermore, since the convex portion 7Aa is located at the corner of the rectangle, the sealing material 7A around the convex portion 7Aa is not easily compressed. By fastening the vicinity of the portion of the sealing material 7A that is difficult to be compressed with the bolt 13, the reaction force of the sealing material 7A can be secured more strongly, and the sealing function can be maintained.

  In the present embodiment, since the convex portion 7Aa is provided at the corner portion of the sealing material 7A, it is not necessary to provide the convex portion that restricts the position of each of the two side portions adjacent to the corner portion. For this reason, it is possible to reduce the number of convex portions and contribute to the reduction in manufacturing cost by simplifying the shape of the sealing material 7A, as compared with the case where convex portions that perform position restriction are provided on the sides on both sides of the corner portion. Can do.

  In addition, the convex part used as the position control part of 2nd Embodiment may protrude toward inner wall part 5Aa in 5 A of seal grooves, and it may be in both inner wall part 5Aa and outer wall part 5Ab. It may protrude toward it.

  FIG. 8 shows a seal structure according to the third embodiment of the present invention, and corresponds to FIG. 7 of the second embodiment. As in the second embodiment, the third embodiment includes a rectangular seal groove 5A and a rectangular seal material 7B.

  Outer wall portions 5Ab corresponding to the four portions of seal groove 5A are formed on curved surface 5Ar along the extending direction of seal groove 5A. Further, the outer peripheral side of the sealing material 7B at a position corresponding to the curved surface 5Ar of the outer wall portion 5Ab of the sealing groove 5A is formed as a curved surface 7Br along the extending direction of the sealing material 7B.

  When the curvature of the curved surface 5Ar of the outer wall portion 5Ab of the seal groove 5A is Ra and the curvature of the curved surface 7Br on the outer peripheral side of the sealing material 7B is Rb, Ra <Rb. Thereby, as shown in FIG. 8, the curved surface 7Br on the outer peripheral side of the sealing material 7B having a large curvature (small curvature radius) is brought into contact with the curved surface 5Ar of the seal groove 5A having a small curvature (large curvature radius). A gap SAa is formed between the seal material 7B in a portion excluding the contacted portion and the outer wall portion 5Ab of the seal groove 5A. A gap SAb is formed over the entire circumference between the seal material 7B and the inner wall portion 5Aa of the seal groove 5A.

  Thus, in the third embodiment, the curved surface 7Br of the four corners of the sealing material 7B contacts the curved surface 5Ar of the corner of the seal groove 5A, so that the gap SAa is substantially uniform over the entire circumference of the seal groove 5A. It becomes. The inner gap SAb is substantially uniform over the entire circumference of the seal groove 5A. That is, the curved surface 7Br becomes a position restricting portion that replaces the convex portion 7Aa of the second embodiment. Therefore, if the gap SAa is set so that the outer peripheral side of the sealing material 7B can be in close contact after the internal pressure (pressure in the flow path) is applied, the sealing material 7B excludes the vicinity of the bolt fastening portion (curved surface 7Br). In the portion, it spreads outward so as to fill up the uniform gap SAa, and is in close contact with the outer wall portion 5Ab, so that the sealing function can be ensured over the entire circumference.

  Therefore, a sufficient sealing function can be ensured even between the fastening portions where the compressive force on the sealing material 7B becomes weaker than that of the fastening portion by the bolt 13. Also in this embodiment, in order to ensure a sufficient sealing function, it is not necessary to increase the fastening portion by the bolts 13 or increase the rigidity of the pipe 9A, and the cost increase can be suppressed.

  In the present embodiment, as in the first embodiment, the sealing material 7B is in close contact with the outer wall portion 5Ab even between the bolt fastening portions where the pressing force (compression force) against the sealing material 7B is weak to ensure the sealing performance. can do. At that time, a curved surface 7Br serving as a position restricting portion is provided in the vicinity of the bolt fastening portion where the pressing force against the sealing material 7B is strong, in contact with the curved surface 5Ar of the seal groove 5A. Since the movement of the sealing material 7B is restricted when the curved surface 7Br is in contact with the curved surface 5Ar of the sealing groove 5A, the periphery of the portion including the curved surface 7Br of the sealing material 7B is less likely to be compressed than the other portions. Further, since the curved surface 7Br is located at the corner of the rectangle, the periphery of the portion including the curved surface 7Br is less likely to be compressed than the other portions. By fastening the vicinity of the portion of the sealing material 7B that is difficult to be compressed with the bolt 13, the reaction force of the sealing material 7B can be secured more strongly, and the sealing function can be maintained.

  In the present embodiment, the curved surface 5Ar and the curved surface are set such that the relationship between the curvature Ra of the curved surface 5Ar of the outer wall portion 5Ab of the seal groove 5A and the curvature Rb of the curved surface 7Br on the outer peripheral side of the sealing material 7B is Ra <Rb. What is necessary is just to set a mutual shape with 7Br, and it can respond easily. Moreover, it is not necessary to provide a convex part in the sealing material 7B.

  FIG. 9 shows a seal structure according to the fourth embodiment of the present invention, and corresponds to FIG. 7 of the second embodiment. As in the second embodiment, the fourth embodiment includes a rectangular seal groove 5A and a rectangular seal material 7C.

  Inner wall portions 5Aa corresponding to the four corners of the seal groove 5A are formed on the curved surface 5As along the extending direction of the seal groove 5A. Further, the inner peripheral side of the sealing material 7C at a position corresponding to the curved surface 5As of the inner wall portion 5Aa of the sealing groove 5A is formed as a curved surface 7Cr along the extending direction of the sealing material 7C.

  When the curvature of the curved surface 5As of the inner wall portion 5Aa of the seal groove 5A is Rc and the curvature of the curved surface 7Cr on the inner peripheral side of the sealing material 7C is Rd, Rc> Rd. As a result, as shown in FIG. 9, the curved surface 7Cr on the inner peripheral side of the sealing material 7C having a small curvature (large curvature radius) is brought into contact with the curved surface 5As of the seal groove 5A having a large curvature (small curvature radius). A gap SAb is formed between the seal material 7C in a portion excluding the contacted portion and the inner wall portion 5Aa of the seal groove 5A. A gap SAa is formed over the entire circumference between the seal material 7C and the outer wall portion 5Ab of the seal groove 5A.

  Thus, in the fourth embodiment, the curved surface 7Cr of the four corners of the sealing material 7C contacts the curved surface 5As of the corner of the seal groove 5A, so that the gap SAb is substantially uniform over the entire circumference of the seal groove 5A. It becomes. The outer gap SAa is substantially uniform over the entire circumference of the seal groove 5A. That is, the curved surface 7Cr is a position restricting portion that replaces the convex portion 7Aa of the second embodiment. For this reason, if the gap SAa is set so that the outer peripheral side of the sealant 7C can be in close contact after compression, the sealant 7C spreads outward and adheres closely to the outer wall 5Ab so as to fill the uniform gap SAa over the entire circumference. The sealing function can be ensured over the entire circumference.

  Therefore, a sufficient sealing function can be ensured even between the fastening portions where the compressive force on the sealing material 7C becomes weaker than that of the fastening portions by the bolts 13. Also in this embodiment, in order to ensure a sufficient sealing function, it is not necessary to increase the fastening portion by the bolts 13 or increase the rigidity of the pipe 9A, and the cost increase can be suppressed.

  In the present embodiment, as in the first embodiment, the sealing material 7C is in close contact with the outer wall portion 5Ab even between the bolt fastening portions where the pressing force (compression force) against the sealing material 7C is weak to ensure the sealing performance. can do. At that time, a curved surface 7Cr serving as a position restricting portion is provided in a state where the curved surface 5As of the seal groove 5A is in contact with the vicinity of the bolt fastening portion where the pressing force against the sealing material 7C is strong. Since the movement of the sealing material 7C is restricted when the curved surface 7Cr is in contact with the curved surface 5As of the sealing groove 5A, the periphery of the portion including the curved surface 7Cr of the sealing material 7C is less likely to be compressed than the other portions. Further, since the curved surface 7Cr is located at the corner of the rectangle, the periphery of the portion including the curved surface 7Cr is less likely to be compressed than the other portions. By fastening the vicinity of the portion of the sealing material 7C that is difficult to be compressed with the bolt 13, the reaction force of the sealing material 7C can be secured more strongly, and the sealing function can be maintained.

  In the present embodiment, the curved surface 5As and the curvature Rc of the curved surface 5As of the inner wall 5Aa of the seal groove 5A and the curvature Rd of the curved surface 7Cr of the inner peripheral side of the sealing material 7C satisfy Rc> Rd. What is necessary is just to set a mutual shape with the curved surface 7Cr, and it can respond easily. Moreover, it is not necessary to provide a convex part in the sealing material 7C.

  As mentioned above, although embodiment of this invention was described, these embodiment is only the illustration described in order to make an understanding of this invention easy, and this invention is not limited to the said embodiment. The technical scope of the present invention is not limited to the specific technical matters disclosed in the above embodiment, but includes various modifications, changes, alternative techniques, and the like that can be easily derived therefrom.

  For example, the convex portions 7a and 7Aa in the embodiment of FIG. 1 and the embodiment of FIG. 5 are rectangular in a plan view, but may be a gentle mountain shape. Moreover, although the four convex parts 7a of embodiment of FIG. 1 are provided in the circumferential direction equal interval, at least 2 should just be provided. The two convex portions 7a are provided at positions facing each other with the center of the cooling water passage 1a in between.

  In the embodiment of FIGS. 5 to 9, the sealing material and the sealing groove are rectangular, but may be a polygon more than a triangle. That is, the shape of the seal groove surrounding the inner space is a polygon having at least three corners, and the position restricting portion of the sealing material is in contact with a position corresponding to the corner of the polygon. Good. Moreover, you may combine each embodiment of FIGS. 7-9 suitably.

1 Case (first member)
1a Cooling water passage (internal space)
5, 5A Seal groove 5a, 5Aa Seal groove inner wall 5b, 5Ab Seal groove outer wall 7, 7A, 7B, 7C Seal material 7a, 7Aa Seal material convex portion (position restricting portion)
7Br Curved surface on the outer peripheral side of the sealing material (position regulating part)
Curved surface on the inner circumference side of 7Cr sealing material (position restriction part)
9, 9A Piping (second member)
13 bolts (fasteners)

Claims (6)

A first member including a seal groove formed so as to surround the inner space;
A sealing material accommodated in the sealing groove;
A second member that is attached to the first member so as to cover the seal groove and compresses the sealing material with the first member;
A fastener for fastening and fixing when the second member is attached to the first member,
The seal member is a fastening portion formed by the fastener by a position restricting portion that contacts at least one of the inner wall portion and the outer wall portion in the seal groove and restricts the position of the seal groove in the groove width direction. A seal structure characterized by being provided in the vicinity. The sealing groove is a polygon having a shape surrounding at least three corners around the inner space,
The seal structure according to claim 1, wherein the position restricting portion of the seal material contacts a position corresponding to a polygonal corner of the seal groove.   3. The seal according to claim 1, wherein the position restricting portion includes a convex portion protruding toward at least one of an inner wall portion and an outer wall portion in the seal groove. Construction. The outer wall portion of the seal groove at the corner of the polygon is formed in a curved surface along the extending direction of the seal groove,
The outer peripheral side of the sealing material at a position corresponding to the curved surface of the outer wall portion of the sealing groove is formed in a curved surface along the extending direction of the sealing material,
The seal structure according to claim 2, wherein Ra <Rb, where Ra is a curvature of the curved surface of the outer wall portion of the seal groove and Rb is a curvature of the curved surface on the outer peripheral side of the seal material. The inner wall portion of the seal groove at the corner of the polygon is formed in a curved surface along the extending direction of the seal groove,
The inner peripheral side of the seal material at a position corresponding to the curved surface of the inner wall portion of the seal groove is formed in a curved surface along the extending direction of the seal material,
3. The seal structure according to claim 2, wherein Rc> Rd, where Rc is a curvature of the curved surface of the inner wall portion of the seal groove and Rd is a curvature of the curved surface on the inner peripheral side of the seal material.   The seal structure according to any one of claims 1 to 5, wherein the position restricting portion is located on a shortest distance line between the fastening portion and the internal space of the first member. .

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