JP2012207738A - Sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure that allows a worker to mount a seal member easily, and with which stable sealing performance can be obtained easily.SOLUTION: The sealing structure has a first member 2, a second member 3, a third member 4, an annular seal member 5 for sealing between these three members 2, 3, 4, and an annular mounting groove 20 for mounting the seal member 5 formed between the first member 2 and the second member 3. The seal member 5 has a seal width A formed to be equal to or smaller than a groove width W perpendicular to the axial direction of the mounting groove 20, and has a seal height B formed to be larger than a groove depth D along the axial direction of the mounting groove 20.

Description

  The present invention relates to a sealing structure suitable for sealing between three members of a first member, a second member, and a third member with a sealing member.

  Conventionally, an O-ring is used as a sealing structure between the three members of the first, second, and third members (see, for example, Patent Document 1).

  FIG. 6 shows a main part of an example of a conventional sealing structure. The conventional sealing structure 101 includes an outer member 102 as a first member shown on the left side of FIG. 6 and a first member shown on the upper right side of FIG. The first inner member 103 as the second member, the second inner member 104 as the third member shown in the lower right part of FIG. 6, the outer member 102, the first inner member 103, and the second inner member It has an O-ring 105 as an annular seal member formed of a rubber-like elastic body for sealing between the three members of the member 104. In the sealing structure 101, the right side in FIG. 6 is the center side, and the left side is the outside.

  The outer member 102 has an outer inner surface 111 formed in an annular shape. The outer inner surface 111 has a stepped cylindrical shape in which a small diameter inner surface 111a shown in the upper part of FIG. 6 and a large diameter inner surface 111b formed slightly larger than the small diameter inner surface 111a shown in the lower part of FIG. 6 are connected by a tapered step part 111c. Is formed. The tapered step portion 111 c serves as a guide surface 112 when the O-ring 105 is mounted.

  As shown in an exaggerated manner in FIG. 6, the first inner member 103 has an annular inner outer surface disposed opposite to the small-diameter inner surface 111 a with a first seal gap 114 serving as a preset seal gap. One outer surface 116 is provided. Further, the lower end surface 103a of the first inner member 103 shown in the lower part of FIG. 6 is a plane including the lower end face 103a so that the position shown in the vertical direction in FIG. Is arranged so as to cross the guide surface 112. A concave groove 117 formed in an annular shape having a rectangular cross section is formed at the lower end corner of the first outer surface 116. Further, a space surrounded by the outer inner surface 111 of the outer member 102 and the concave groove 117 is a mounting groove 120 for mounting the O-ring 105.

  The groove width Wa in the direction perpendicular to the axial direction (the direction along the center line) shown in the vertical direction of FIG. 6 of the mounting groove 120 is opposite to the small-diameter inner surface 111a shown in the left-right direction of FIG. The groove width Wa is defined to be smaller than the wire diameter d of the O-ring 105 in the free state. Further, the groove depth Da of the mounting groove 120 is the distance between the top wall 117b of the concave groove 117 shown in the vertical direction of FIG. 6 and the lower end surface 103a of the first inner member 103 extending in parallel to the top wall 117b. Is regulated by The groove depth Da of the mounting groove 120 is formed substantially equal to the wire diameter of the O-ring 105 in the free state. Note that the cross-sectional shape of the O-ring 105 shown in FIG. 6 is a schematic shape different from the actual shape. Further, the crushing margin of the O-ring 105 is indicated by a two-dot chain line in FIG.

  The second inner member 104 is assembled to the first inner member 103, and as shown in an exaggerated manner in FIG. 6, a large-diameter inner surface 111b and a second seal gap 122 as a preset seal gap are provided. A second outer surface 124 is provided as an annular inner outer surface disposed opposite to each other. The upper end surface 104a shown in the upper part of FIG. 6 of the second inner member 104 is, as exaggeratedly shown in FIG. 6, the third seal as a preset seal gap with the lower end surface 103a of the first inner member 103. 6 are opposed to each other with a gap 126, and the position shown in the vertical direction in FIG. 6 is in the middle of the guide surface 112 in the axial direction, that is, the plane including the upper end surface 104a crosses the guide surface 112. Is arranged.

  According to the conventional sealing structure 101 having such a configuration, after the mounting groove 120 is formed by the outer member 102 and the first inner member 103, the O-ring 105 is inserted into the mounting groove 120, and then the outer member 102. The second inner member 104 is assembled to the first inner member 103, and more specifically, the second inner member 104 is assembled to the first inner member 103. As a result, the outer inner surface 111 of the outer member 102 in the mounting groove 120, the side walls 117a and the top wall 117b of the mounting groove 120 formed in the first inner member 103, and the upper end surface 104a of the second inner member 104 Of the first, second, and third seal gaps 114, 122, 126 between the outer member 102, the first inner member 103, and the second inner member 104. Three seal gaps are sealed.

Special table 2009-500580

  However, in the above-described conventional sealing structure 101, the O-ring 105 having a wire diameter larger than the groove width Wa of the mounting groove 120 is mounted on the mounting groove 120. There was a problem that it took a lot of labor and time.

  Further, in the conventional sealing structure 101, for example, as shown in FIG. 7, when the O-ring 105 is moved in the direction of the arrow in FIG. 7 and inserted into the mounting groove 120, as shown in FIG. When the second inner member 104 is assembled to the first inner member 103 in this state, the O-ring 105 is attached to the mounting groove 120 at the upper end surface 104a of the second inner member 104. Will be pushed into. At this time, a part of the O-ring 105 protrudes from the mounting groove 120 due to resistance when the O-ring 105 is mounted in the mounting groove 120, and as shown in an exaggerated manner in FIG. There is a problem in that the portion is sandwiched between the third seal gaps 126 (galling), and the surface that is the seal surface of the O-ring 105 may be lost to impair the sealing performance.

  If a part of the O-ring 105 protruding from the mounting groove 120 is sandwiched between the third seal gaps 126, the third seal gap 126 may be larger than when the O-ring 105 does not protrude from the mounting grooves 120. .

  Therefore, there is a demand for a sealing structure that allows an operator to easily attach the seal member and that can easily obtain stable sealing performance.

  The present invention has been made in view of the above points, and provides a sealing structure in which a worker can easily mount a seal member and can easily obtain stable sealing performance. Objective.

  In order to achieve the above-described object, the sealing structure according to the first aspect of the present invention is characterized by a first member, a second member, a third member, and the first, An annular seal member formed of a rubber-like elastic body for sealing between the three members of the second and third members, and the above-mentioned member formed between the first member and the second member An annular mounting groove for mounting the seal member, and the seal member has a groove width in which the seal width in the direction orthogonal to the axial direction is orthogonal to the axial direction of the mounting groove And the seal height along the axial direction is larger than the groove depth along the axial direction of the mounting groove, and the seal member is the first and second members. When the third member is assembled to the mounting groove It said second member and is compressed between the member of the member 3 is elastically deformed, the first by elastic deformation, in that it is in close contact with the respective second and third members in. By adopting such a configuration, since the seal width of the seal member is formed to be equal to or smaller than the groove width of the mounting groove, the seal member can be easily mounted in the mounting groove. Further, since the seal width of the seal member is formed to be equal to or smaller than the groove width of the mounting groove, and the seal height of the seal member is formed to be greater than the groove depth of the mounting groove, the seal member is disposed in the mounting groove. The second member and the third member are compressed between the second member and the third member to be elastically deformed, and are formed to be in close contact with each of the first, second and third members by this elastic deformation. The protrusion of the member can be prevented. As a result, the operator can easily attach the seal member, and stable sealing performance can be easily obtained.

  The sealing structure according to a second aspect of the present invention is characterized in that, in the first aspect, the mounting groove is formed to have a rectangular cross section, and the sealing member includes central portions at both ends in the axial direction. A seal part is formed in each of the center portions at both ends in the radial direction orthogonal to the axial direction, and the seal part formed at the center portion at both ends in the axial direction of the seal member is the third member, A seal part that is in close contact with the groove wall facing the third member of the mounting groove and formed at the center of both ends in the radial direction of the seal member includes the first member and the first of the mounting groove. It exists in the point closely contacted with the groove wall facing one member. And by adopting such a configuration, the seal part is provided in each of the central part of both ends in the axial direction of the seal member and the central part of both ends in the radial direction. The position of the seal part provided at the axial end of the seal member even when the axial end of the seal member facing the mounting groove is slightly displaced from the mounting groove. Can be made to face the mounting groove, so that the seal member can be smoothly inserted into the mounting groove.

  The sealing structure according to a third aspect of the present invention is characterized in that, in the first or second aspect, the seal member is configured such that two adjacent seal parts of the seal parts are inclined with respect to the axial direction. It is in the point connected by the inclined surface. And by employ | adopting such a structure, since an inclined surface functions as a guide at the time of inserting a sealing member in a mounting groove, a sealing member can be more smoothly inserted in a mounting groove.

  According to a fourth aspect of the present invention, there is provided a sealing structure according to any one of the first to third aspects, wherein the first member is an outer member and the second member is an inner side of the outer member. And the third member is a second inner member that is disposed inside the outer member and assembled to the first inner member. And by employ | adopting such a structure, the structure which has arrange | positioned the 2nd and 3rd member inside the 1st member can be obtained easily.

  According to a fifth aspect of the present invention, there is provided a sealing structure according to any one of the first to third aspects, wherein the first member is an inner member and the second member is an outer side of the inner member. And the third member is a second outer member that is disposed on the outer side of the inner member and is assembled to the first outer member. And by employ | adopting such a structure, the structure which has arrange | positioned the 2nd and 3rd member on the outer side of the 1st member can be obtained easily.

  According to the sealing structure of the present invention, it is possible for an operator to easily attach the seal member, and to obtain excellent effects such as that a stable sealing performance can be easily obtained.

The exploded expanded sectional view showing the important section of a 1st embodiment of the sealing structure concerning the present invention. The expanded sectional view which shows the principal part of 1st Embodiment of the sealing structure which concerns on this invention Explanatory drawing which shows the insertion state of the sealing member in the mounting process of the sealing member with respect to the mounting groove of FIG. Explanatory drawing which shows the state in which a part of seal member was inserted in the inside of a mounting groove in the mounting groove of FIG. The figure similar to FIG. 1 which shows the principal part of 2nd Embodiment of the sealing structure which concerns on this invention Configuration enlarged sectional view showing an example of a conventional sealing structure Explanatory drawing which shows the state which made the O-ring confront the mounting groove of FIG. Explanatory drawing which shows the state where an O-ring does not fit in the mounting groove of FIG. Explanatory drawing which shows the state which sandwiched a part of O-ring which protruded from the installation groove | channel of FIG.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 and 2 show a first embodiment of a sealing structure according to the present invention. FIG. 1 is an exploded enlarged sectional view showing a main part, and FIG. 2 is an enlarged sectional view.

  This embodiment illustrates a structure in which the second and third members are arranged inside the first member.

  As shown in FIGS. 1 and 2, the sealing structure 1 of the present embodiment includes an outer member 2 as a first member shown on the left side of FIGS. 1 and 2 and a first member shown on the upper right side of FIGS. 1 and 2. The first inner member 3 as the second member, the second inner member 4 as the third member shown in the lower right part of FIGS. 1 and 2, the outer member 2, the first inner member 3 and the second member And an annular seal member 5 formed of a rubber-like elastic body exhibiting rubber elasticity such as rubber and thermoplastic elastomer for sealing between the three members of the two inner members 4. In the sealing structure 1 of the present embodiment, the right side in FIGS. 1 and 2 is the center side, and the left side is the outside.

  The outer member 2 has an outer inner surface 11 formed in an annular shape. The outer inner surface 11 is formed in a stepped cylindrical shape in which a small-diameter inner surface 11a shown above and a large-diameter inner surface 11b formed slightly larger than the small-diameter inner surface 11a shown below are connected by a tapered step portion 11c. Yes. The tapered step portion 11c serves as a guide surface 12 when the seal member 5 is mounted. The inner surface of the outer member 2 may be uniform without the step portion 11c.

  As shown exaggeratedly in FIGS. 1 and 2, the first inner member 3 has an annular inner surface disposed opposite to the small-diameter inner surface 11 a with a first seal gap 14 as a preset seal gap. A first outer surface 16 is provided as an outer surface. The lower end surface 3a as the lower surface shown below the first inner member 3 is such that the position shown in the vertical direction is in the middle of the guide surface 12 in the axial direction, that is, a plane including the lower end surface 3a. It arrange | positions so that the guide surface 12 may be crossed. A concave groove 17 formed in an annular shape having a rectangular cross section is formed at the lower end corner of the first outer surface 16. Furthermore, a space surrounded by the outer inner surface 11 of the outer member 2 and the concave groove 17 is a mounting groove 20 for mounting the seal member 5.

  The groove width W in the direction perpendicular to the axial direction (direction along the center line) shown in the vertical direction of the mounting groove 20 is such that the small-diameter inner surface 11a shown in the left-right direction and the concave groove 17 facing the small-diameter inner surface 11a. The groove width W is restricted by the distance from the side wall 17a, and is formed to be equal to or smaller than the seal width A shown in the left-right direction in FIG. 1 of the seal member 5 in the free state. Further, the groove depth D along the vertical direction of the mounting groove 20 is such that the top wall 17b of the concave groove 17 shown in the upper part of FIG. 1 and the lower end surface of the first inner member 3 extending parallel to the top wall 17b. It is regulated by the interval with 3a. The groove depth D of the mounting groove 20 is formed to be smaller than the seal height B shown in the vertical direction of FIG. 1 of the seal member 5 in the free state.

  The second inner member 4 is assembled to the first inner member 3 and, as exaggeratedly shown in FIG. 2, a second seal gap 22 as a preset seal gap with the large-diameter inner surface 11b. A second outer surface 24 is provided as an annular inner outer surface arranged opposite to each other. The upper end surface 4a as the upper surface shown in the upper part of FIGS. 1 and 2 of the second inner member 4 is preset with the lower end surface 3a of the first inner member 3, as exaggeratedly shown in FIG. The third seal gap 26 serving as a seal gap is disposed opposite to each other, and the position shown in the vertical direction is a midway position in the axial direction of the guide surface 12, that is, the plane including the upper end surface 4a is the guide. It is arranged so as to cross the surface 12.

  In the free state shown in FIG. 1, the seal member 5 has a seal width A in a direction perpendicular to the axial direction shown in the vertical direction in FIG. The seal height B (seal thickness) along the axial direction is equal to or smaller than the groove width W orthogonal to the axial direction shown in the direction, and the groove depth D along the axial direction of the mounting groove 20 It is formed larger. Further, the seal member 5 is formed in a substantially long rhombus shape whose cross-sectional shape is long in the vertical direction, the upper half and the lower half are formed vertically symmetrically, and the left half and the right half are formed symmetrically left and right. Has been. And the surface of the upper top part of the sealing member 5 was made into the upper seal part 30a (close part) arrange | positioned in the center part of the upper surface of an axial direction, and the surface of the lower top part was formed in the horizontal direction center part of the lower surface. The lower seal part 30b is used. Further, the surface of the outer top portion of the seal member 5 is an outer seal part 30c disposed at the center in the vertical direction of the outer surface in the radial direction (width direction) orthogonal to the axial direction, and the surface of the inner top portion is the shaft The inner seal part 30d is arranged at the center in the vertical direction of the inner surface in the radial direction (width direction) orthogonal to the direction.

  That is, in the seal member 5 of the present embodiment, the upper seal part 30a formed at the center in the left-right direction on the upper surface, the lower seal part 30b formed at the center in the left-right direction on the lower surface, and the center in the vertical direction on the outer surface. A total of four seal parts 30 (reference numeral 30 is an upper seal part 30a, a lower seal part 30b, an outer seal part 30c, and an outer seal part 30c, The inner seal part 30d is generically named).

  That is, the seal member 5 of the present embodiment has a radial direction (width direction) perpendicular to the axial direction in the axial section, that is, the central part of both ends in the axial direction, that is, the central part of each of the upper surface and the lower surface. An annular seal part 30 is formed at the center of both ends, that is, the center of each of the outer surface and the inner surface.

  Each seal part 30 is connected by an inclined surface 32 in which two adjacent seal parts 30 are inclined with respect to the axial direction. That is, the upper seal part 30a and the outer seal part 30c are connected by an upper left inclined surface 32a that extends obliquely downward to the left from the upper seal part 30a, and the upper seal part 30a and the inner seal part 30d are connected to each other. The lower seal part 30b and the outer seal part 30c are connected by a lower left inclined surface 32c that extends diagonally to the left from the lower seal part 30b. The part 30b and the inner seal part 30d are connected by a lower right inclined surface 32d that extends obliquely upward to the right from the lower seal part 30b. The upper left inclined surface 32a and the lower left inclined surface 32c, the upper right inclined surface 32b and the lower right inclined surface 32d, the upper left inclined surface 32a and the upper right inclined surface 32b, and the lower left inclined surface 32c and the lower right inclined surface 32d are formed symmetrically. (32 is a generic name for the upper left inclined surface 32a, the upper right inclined surface 32b, the lower left inclined surface 32c, and the lower right inclined surface 32d).

  As the cross-sectional shape of the seal member 5, various shapes such as a vertically long ellipse and a vertically long hexagon can be used. Moreover, as the seal part 30, you may arrange | position by single, multiple, or these combining in each surface of upper and lower inside and outside. Furthermore, as the seal part 30, an annular protrusion having various cross-sectional shapes such as a semicircle, a semi-ellipse, and a triangle can be used.

  In the mounting state shown in FIG. 2, the seal member 5 is a groove wall in which the lower seal part 30 b is in close contact with the second inner member 4 and the upper seal part 30 a is opposed to the second inner member 4 of the mounting groove 20. The outer seal part 30c is in close contact with the small-diameter inner surface 11a of the outer member 2, and the inner seal part 30d is a concave groove as a groove wall facing the outer member 2 of the mounting groove 20. 17 is in close contact with the side wall 17a.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  FIG. 3 is an explanatory view showing a state in which a part of the seal member is inserted into the mounting groove, and FIG. 4 is an explanatory view showing a state in which the seal member is inserted into the mounting groove.

  As shown in FIG. 1, the sealing structure 1 of the present embodiment has the first inner member 3 disposed on the outer member 2 or the outer member 2 disposed on the first inner member 3. After the mounting groove 20 is formed by the inner member 3, the seal member 5 is opposed to the formed mounting groove 20.

  Next, the seal member 5 is inserted into the mounting groove 20. At this time, since the inclined surface 32 facing the mounting groove 20 of the seal member 5 functions as an insertion guide, it can be smoothly inserted into the mounting groove 20 without using a dedicated mounting jig. As indicated by the chain line, even if the position of the seal member 5 is shifted, it can be smoothly inserted into the mounting groove 20.

  Next, when the seal member 5 is inserted into the mounting groove 20, the upper seal part 30 a of the seal member 5 is formed as a groove wall as a groove wall facing the second inner member 4 of the mounting groove 20 as shown in FIG. 4. The outer seal part 30c is in contact with the small-diameter inner surface 11a of the outer member 2 with a slight clearance, while being in contact with the top wall 17b, and the inner seal part 30d is a groove wall facing the outer member 2 of the mounting groove 20. It contacts or abuts against the side wall 17a of the groove 17 with a slight clearance.

  Depending on the seal width A and the inner and outer diameters of the seal member 5, the outer seal part 30 c may contact the small-diameter inner surface 11 a of the outer member 2, and the inner seal part 30 d may contact the side wall 17 a of the groove 17. However, both the outer seal part 30c and the inner seal part 30d may be in a non-contact state.

  Next, when the second inner member 4 is assembled to the first inner member 3, the upper end surface 4a of the second inner member 4 approaches the lower end surface 3a of the first inner member 2, and the third seal gap 26 to face each other. At this time, the upper end surface 4a of the second inner member 4 abuts on the lower seal part 30b of the seal member 5 and pushes the seal member 5 into the mounting groove 20, so that the seal member 5 is moved vertically in the mounting groove 20. As shown in FIG. 2, the lower seal part 30 b comes into close contact with the upper end surface 4 a of the second inner member 4, and the upper seal part 30 a faces the second inner member 4 of the mounting groove 20. The outer seal part 30c is in close contact with the small-diameter inner surface 11a of the outer member 2, and the inner seal part 30d is in close contact with the side wall 17a of the concave groove 17 facing the outer member 2 of the mounting groove 20. Thus, the seal member 5 seals the three members of the outer member 2, the first inner member 3, and the second inner member 4. At this time, a preset third seal gap 26 is formed between the upper end surface 4 a of the second inner member 4 and the lower end surface 3 a of the first inner member 3.

  As described above, according to the sealing structure 1 of the present embodiment, the seal width A of the seal member 5 is formed to be equal to or smaller than the groove width W of the mounting groove 20, so that a dedicated mounting jig is not used. The operator can easily mount the seal member 5 in the mounting groove 20.

  Further, according to the sealing structure 1 of the present embodiment, the seal width A of the seal member 5 is formed to be equal to or smaller than the groove width W of the mounting groove 20, and the seal height B of the seal member 5 is set to the mounting groove. 20, the seal member 5 is compressed and elastically deformed between the first inner member 3 and the second inner member 4 in the mounting groove 20, and this elastic deformation. Since the outer member 2, the first inner member 3 and the second inner member 4 are formed in close contact with each other, the seal member 5 can be prevented from protruding.

  Therefore, according to the sealing structure 1 of the present embodiment, the operator can easily attach the seal member 5, and stable sealing performance can be easily obtained.

  Furthermore, according to the sealing structure 1 of the present embodiment, since the worker can easily attach the seal member 5, workability by the worker can be improved.

  Further, according to the sealing structure 1 of the present embodiment, the seal part 30 is provided at each of the central part at both ends in the axial direction and the central part at both ends in the radial direction of the seal member 5. When the seal member 5 is mounted, even if the axial end of the seal member 5 facing the mounting groove 20, in this embodiment, the upper seal part 30 a is slightly displaced with respect to the mounting groove 20. Since the position of the upper seal part 30a, which is the seal part 30 provided at the end of the seal member 5 in the axial direction, can be opposed to the inside of the mounting groove 20, the seal member 5 can be smoothly inserted into the mounting groove 20. Can be inserted.

  Furthermore, according to the sealing structure 1 of the present embodiment, the seal member 5 is connected by the inclined surface 32 in which the two adjacent seal parts 30 among the seal parts 30 are inclined with respect to the axial direction. Of the inclined surface 32, the upper left inclined surface 32a and the upper right inclined surface 32b that face the mounting groove 20 function as guides when the seal member 5 is inserted into the mounting groove 20, so that the seal member 5 is inserted into the mounting groove 20. It can be inserted more smoothly.

  Furthermore, according to the sealing structure 1 of the present embodiment, the cross-sectional shape of the seal member 5 is formed in a vertically long rhombus shape that is long in the vertical direction, and the upper half and the lower half are formed vertically symmetrically. The directionality is not selected for insertion into the mounting groove 20. Thereby, an operator can mount the seal member 5 more easily.

  Furthermore, according to the sealing structure 1 of the present embodiment, since the outer member 2, the first inner member 3, and the second inner member 4 are included, the first and second members are disposed inside the outer member 2. The structure which arrange | positions these inner members 3 and 4 can be obtained easily.

  FIG. 5 shows a second embodiment of the sealing structure according to the present invention.

  The sealing structure 41 of the present embodiment is obtained by disposing the second and third members outside the first member.

  That is, as shown in FIG. 5, the sealing structure 41 of the present embodiment includes an inner member 42 as a first member shown on the right side of FIG. 5 and a first member as a second member shown on the upper left side of FIG. 3, a second outer member 44 as a third member shown in the lower left part of FIG. 5, and these inner member 42, first outer member 43, and second outer member 44. An annular sealing member 5 similar to the sealing structure 1 of the first embodiment described above for sealing the gap is provided. In the sealing structure 41 of the present embodiment, the right side in FIG. 5 is the center side, and the left side is the outside.

  The inner member 42 has an inner outer surface 51 formed in an annular shape. The inner outer surface 51 is formed in a stepped cylindrical shape in which a large-diameter outer surface 51a shown above and a small-diameter outer surface 51b formed slightly smaller than the large-diameter outer surface 51a shown below are connected by a tapered step portion 51c. ing. The tapered step portion 51c serves as a guide surface 52 when the seal member 5 is mounted. The outer surface of the inner member 42 may be uniform without the stepped portion 51c.

  As shown in an exaggerated manner in FIG. 5, the first outer member 43 has an annular outer inner surface disposed opposite to the large-diameter outer surface 51 a with a first seal gap 54 as a preset seal gap. The first inner surface 56 is provided. The lower end surface 43a shown below the first outer member 43 is positioned so that its vertical position is in the middle of the guide surface 52 in the axial direction, that is, the plane including the lower end surface 43a is the guide surface 52. It is arranged to cross. A concave groove 57 formed in an annular shape having a rectangular cross section is formed in the lower end corner of the first inner surface 56. Further, a space surrounded by the inner outer surface 51 of the inner member 42 and the concave groove 57 is a mounting groove 60 for mounting the seal member 5.

  The groove width W in a direction perpendicular to the axial direction (direction along the center line) shown in the vertical direction of the mounting groove 60 is a large-diameter outer surface 51a shown in the left-right direction and a concave groove facing the large-diameter outer surface 51a. 57, the groove width W is equal to or slightly smaller than the seal width A of the seal member 5 in the free state, like the sealing structure 1 of the first embodiment. (See FIG. 1). Further, the groove depth D of the mounting groove 60 extends in parallel with the ceiling wall 57b of the recessed groove 57 shown in the upper part of FIG. 5 and the ceiling wall 57b, as in the sealing structure 1 of the first embodiment described above. The first outer member 43 is restricted by the distance from the lower end surface 43a. The groove depth D of the mounting groove 60 is formed smaller than the seal height B of the seal member 5 in the free state, as in the sealing structure 1 of the first embodiment described above (see FIG. 1).

  The second outer member 44 is assembled to the first outer member 43, and as shown in an exaggerated manner in FIG. 5, a small-diameter outer surface 51b and a second seal gap 62 as a preset seal gap are provided. A second inner surface 64 is provided as an annular outer inner surface disposed opposite to each other. The upper end surface 44a shown in the upper part of FIG. 5 of the second outer member 44 is, as exaggeratedly shown in FIG. 5, a third seal as a preset seal gap with the lower end surface 43a of the first outer member 43. 5 are opposed to each other with a gap 66, and the position shown in the vertical direction in FIG. 5 is in the middle of the guide surface 52 in the axial direction, that is, the plane including the upper end surface 44a crosses the guide surface 52. Is arranged.

  Since other configurations are the same as those of the sealing structure 1 of the first embodiment described above, detailed description thereof is omitted.

  According to the sealing structure 41 of the present embodiment having such a configuration, the structure in which the first and second inner members 3 and 4 are arranged inside the outer member 2 in the sealing structure 1 of the first embodiment described above. Except for the effect that it can be easily obtained, the same effect can be achieved.

  Moreover, according to the sealing structure 41 of this embodiment, the structure which arrange | positions the 1st and 2nd inner members 3 and 4 inside the outer member 2 in the sealing structure 1 of 1st Embodiment mentioned above can be obtained easily. In place of the effect that the first and second outer members 43 and 44 are arranged outside the inner member 42, the effect that the structure in which the first and second outer members 43 and 44 are arranged can be easily obtained.

  The sealing structure of the present invention can be used for both a fixing seal (gasket) and a movement seal (packing).

  In addition, this invention is not limited to each embodiment mentioned above, A various change is possible as needed.

1, 41 Sealing structure 2 Outer member (first member)
3 First inner member (second member)
4 Second inner member (third member)
5 Seal member 14, 54 First seal gap 17, 57 Recess groove 20, 60 Mounting groove 22, 62 Second seal gap 26, 66 Third seal gap 30 Seal part 30a Upper seal part 30b Lower seal part 30c Outer seal part 30d Inner seal part 32 inclined surface 32a upper left inclined surface 32b upper right inclined surface 32c lower left inclined surface 32d lower right inclined surface 42 inner member (first member)
43 First outer member (second member)
44 Second outer member (third member)
A Seal width B Seal height D Groove depth W Groove width

Claims (5)

An annular member formed by a rubber-like elastic body for sealing between the first member, the second member, the third member, and the three members of the first, second and third members. A seal member, and an annular mounting groove for mounting the seal member formed between the first member and the second member;
The seal member is formed so that the seal width in the direction orthogonal to the axial direction is equal to or smaller than the groove width orthogonal to the axial direction of the mounting groove, and the seal height along the axial direction Is formed larger than the groove depth along the axial direction of the mounting groove,
The seal member is compressed between the second member and the member of the member 3 in the mounting groove when the third member is assembled to the first and second members. A sealing structure which is elastically deformed and is brought into close contact with each of the first, second and third members by the elastic deformation. The mounting groove is formed to have a rectangular cross section,
The seal member has a seal part formed at each of a central portion at both ends in the axial direction and a central portion at both ends in the radial direction orthogonal to the axial direction,
Seal parts formed at the center of both ends in the axial direction of the seal member are in close contact with the third member and a groove wall facing the third member of the mounting groove, and the radial direction of the seal member 2. The sealing structure according to claim 1, wherein seal parts formed at center portions of both ends of the sealing member are in close contact with the first member and a groove wall facing the first member of the mounting groove.   The sealing structure according to claim 2, wherein two seal parts adjacent to each other among the seal parts are connected by an inclined surface inclined with respect to the axial direction.   The first member is an outer member, the second member is a first inner member disposed inside the outer member, the third member is disposed inside the outer member, and the first member The sealing structure according to any one of claims 1 to 3, wherein the sealing structure is a second inner member assembled to the inner member.   The first member is an inner member, the second member is a first outer member arranged outside the inner member, the third member is arranged outside the inner member, and the first member The sealing structure according to any one of claims 1 to 3, wherein the sealing structure is a second outer member assembled to the outer member.

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