JP2017160972A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure which can secure sufficient seal performance, in the seal structure for fastening a clearance between members in which a liquid seal material is interposed with a bolt.SOLUTION: A chamfered face 30 in which a distance passing a center axial line C of a penetration hole 20 becomes short as separating from a second member is formed at an opening of the penetration hole 20 formed at a first member 12 at the second member 14 side, and the chamfered face 30 is formed of a first chamfered face 32 forming a first inclination angle α1 with respect to a first seal face 22, and a second chamfered face 34 which adjoins the first chamfered face 32, and forms a second inclination angle α2 larger than the first inclination angle α1. Therefore, a liquid seal material 16 flows toward the penetration hole 20 while contacting with the first chamfered face 32, a larger space is secured between the chamfered face 30 and the penetration hole 20 by the second chamfered face 34, the liquid seal material 16 is prevented from arriving at the penetration hole 20, and sufficient seal performance can be secured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing structure using a liquid sealing material.

  A first member having a flat first seal surface and having a through hole penetrating in the thickness direction; a second seal surface facing the first seal surface of the first member; and a screw hole being formed. There is a known type of seal structure in which the second member is fastened to the screw hole with a fastening bolt through a through-hole in a state where a liquid sealant is interposed between the first seal surface and the second seal surface. It has been. For example, the seal structures described in Patent Documents 1 to 4 are the same.

JP 2013-113339 A JP-A-11-050910 Japanese Patent No. 5003660 Japanese Utility Model Publication No. 01-120714

  In the above-mentioned patent document, with respect to a seal structure in which a liquid sealing material is interposed between divided members and each member is fastened with a fastening bolt, the periphery of a fastening portion where the fastening bolt is fastened is deformed, or between members By forming recesses or dish-like chamfers that are open on the joint surfaces, the liquid sealing material is prevented from being deformed or leaked to the outside, thereby ensuring sealing performance. However, in the technique of the above-mentioned patent document, when the liquid sealing material interposed between the members flows into the fastening portion by fastening between the members, the liquid sealing material adheres to the fastening bolt, and the fastening bolt tightening accuracy is lowered. If the bolt is tightened tightly, the thickness of the liquid sealing material may be reduced and sufficient sealing performance may not be exhibited. In addition, if a gap is provided by simply hollowing the periphery of the fastening bolt to prevent the liquid sealing material from adhering to the fastening bolt, the liquid sealing material may not adhere to the member and may not exhibit sufficient sealing performance. There is.

  The present invention has been made against the background of the above circumstances, and the object of the present invention is to secure sufficient sealing performance in a sealing structure in which a member with a liquid sealing material interposed is fastened with a fastening bolt. It is to provide a seal structure.

  The gist of the present invention is as follows: (a) a first member having a flat first seal surface and having a through hole penetrating in the thickness direction; and facing the first seal surface of the first member. A second member having a second sealing surface and having a threaded hole is inserted through the through hole in a state where a liquid sealing material is interposed between the first sealing surface and the second sealing surface. In the type of seal structure in which the fastening bolt is fastened to the screw hole, (b) a distance between the opening of the through hole on the second member side and the central axis of the through hole as the distance from the second member increases (C) The chamfered surface is located on the second member side and forms a first inclination angle with respect to the first seal surface in a cross section passing through the central axis of the through hole. A first chamfered surface, and the second member with respect to the first chamfered surface It is adjacent to the opposite side, in that it is composed of a second chamfered surface forming a second angle of inclination greater than the first inclination angle.

  In this way, the chamfered surface is formed in the opening on the second member side of the through hole so that the distance from the central axis of the through hole decreases as the distance from the second member increases. The first chamfered surface that forms the first inclined angle with respect to the first seal surface in a cross section that is located on the second member side and that passes through the central axis of the through hole, and the first chamfered surface The second member is adjacent to the opposite side of the second member, and the second chamfered surface forms the second inclination angle larger than the first inclination angle. Since the liquid sealing material interposed between the second member flows toward the through hole while being in contact with the first chamfered surface, sufficient sealing performance can be ensured. Further, since the chamfered surface includes the second chamfered surface that forms the second tilt angle larger than the first tilt angle, the chamfered surface is compared with the case where the second chamfered surface is not formed. And a larger space between the through hole and the liquid sealing material can be prevented from reaching the through hole, and the liquid sealing material can be prevented from adhering to the fastening bolt. Can be secured.

  Here, preferably, the first inclination angle is 20 ° to 40 °, more preferably 30 ° with respect to the first seal surface, and the second inclination angle is formed on the first seal surface. On the other hand, it is formed at 65 ° to 85 °, more preferably 75 °. As a result, the liquid sealing material interposed between the first member and the second member flows toward the through hole while being in contact with the first chamfered surface, thereby ensuring sufficient sealing performance. can do. Further, since the chamfered surface includes the second chamfered surface that forms the second tilt angle larger than the first tilt angle, the chamfered surface is compared with the case where the second chamfered surface is not formed. And a larger space between the through hole and the liquid sealing material can be prevented from reaching the through hole, and the liquid sealing material can be prevented from adhering to the fastening bolt. Can be secured.

It is the figure which showed roughly the seal structure to which this invention was applied. It is the figure which showed schematically the seal structure in the other Example of this invention.

  An embodiment of the present invention will be described below with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a diagram schematically showing a seal structure 10 to which the present invention is applied. The seal structure 10 includes a first member 12, a second member 14, a highly viscous liquid seal material 16 interposed between the first member 12 and the second member 14, the first member 12 and the second member. Fastening bolts 18 that fasten 14 are fastened. The seal structure 10 is used, for example, for mating surfaces of a vehicle transmission case, a transaxle case, a differential case, and the like (not shown).

  The first member 12 is provided with a through hole 20 having a flat first seal surface 22 and penetrating in the thickness direction. Further, the second member 14 has a second seal surface 24 facing the first seal surface 22 and is formed with a screw hole 26. The fastening bolt 18 is passed through the through hole 20 in a state where the liquid sealing material 16 is interposed between the first member 12 and the second member 14, and the first member 12 and the second member 14 through the screw hole 26. And conclude.

  The opening on the second member 14 side of the through hole 20 formed in the first member 12 is a distance from the central axis C of the through hole 20 or a diameter dimension passing through the central axis C as the distance from the second member 14 increases. A chamfered surface 30 is formed to reduce the. The chamfered surface 30 has a first chamfered surface 32 that forms a first inclination angle α1 with respect to the first seal surface 22 and a second chamfered surface 32 with respect to the first chamfered surface 32 in a cross section passing through the central axis C of the through hole 20. It is composed of a second chamfered surface 34 which is adjacent to the side opposite to the member 14 and forms a second inclination angle α2 which is larger than the first inclination angle α1.

  Specifically, the opening on the second member 14 side is formed in the first seal surface 22 in a circular shape centering on the central axis C of the through hole 20, and the cross section passing through the central axis C of the through hole 20 is The distance from the central axis C of the through hole 20 or the diameter dimension passing through the central axis C decreases as the distance from the two members 14 decreases. That is, the chamfered surface 30 is formed so that the opening of the through hole 20 on the second member 14 side is reduced in diameter with the central axis C of the through hole 20 as the distance from the second member 14 increases. A first chamfered surface 32 that forms a first inclination angle α1 is formed on the chamfered surface 30 on the second member 14 side. The first inclination angle α <b> 1 is formed with an acute angle with respect to the first seal surface 22. Further, the first chamfered surface 32 is formed adjacent to the opposite side of the second member 14 and forms a second inclination angle α2 that is larger than the first inclination angle α1 with respect to the first seal surface 22. A two-chamfered surface 34 is formed. The second inclination angle α <b> 2 is formed with an acute angle with respect to the first seal surface 22. Therefore, the chamfered surface 30 has two chamfered surfaces with different inner diameters in the thickness direction of the first member 12 on the second member 14 side of the through hole 20 formed in the first member 12, that is, on the first seal surface 22 side. Adjacent to each other. The inner diameter of the chamfered surface 30 is formed so as to be reduced as the distance from the second member 14 increases.

  When the first member 12 and the second member 14 are fastened by the fastening bolts 18 with the liquid sealing material 16 interposed, the liquid sealing material 16 interposed between the first member 12 and the second member 14. Is caused to flow toward the through hole 20 while being in contact with the second seal surface 24 and the first chamfered surface 32. By allowing the liquid sealing material 16 to flow toward the through hole 20 while being in contact with the first chamfered surface 32 formed at the first inclination angle α1, for example, a void that is simply hollowed out around the through hole 20, that is, the through hole 20 is formed. Compared to the counterbored hole formed at a right angle with respect to the first sealing surface 22, the liquid sealing material 16 has a sufficient film thickness to be securely bonded to the first member 12 and the second member 14. Therefore, the first member 12 and the second member 14 are reliably sealed. In addition, when a sufficient film thickness is secured in the liquid sealing material 16 and bonded to the first member 12 and the second member 14, the radial direction of the through hole 20 is between the first member 12 and the second member 14. When the relative displacement occurs, for example, either the first member 12 or the second member 14 follows the other one of the first member 12 or the second member 14 so as to eliminate the displacement difference. The generated mounting error is suppressed.

  Further, the liquid sealing material 16 that is caused to flow toward the through hole 20 is released to the space 36 formed by the second chamfered surface 34. The space 36 formed by the second chamfered surface 34 has a second tilt angle α2 larger than the first tilt angle α1 by setting the tilt angle forming the second chamfered surface 34 to be the volume of the space 36, that is, the second chamfered surface 34. It is formed so as to increase the volume of the space formed by the chamfered surface 34. Therefore, the liquid seal material 16 that is allowed to flow toward the through hole 20 can be stored in the space 36 more than in the case where the second inclination angle α2 is not formed. By preventing the liquid sealing material 16 from adhering to the fastening bolt 18 without the liquid sealing material 16 reaching, a reduction in the axial force of the fastening bolt 18 is suppressed.

  Thus, according to the present embodiment, the opening on the second member 14 side of the through hole 20 passes through the distance from the central axis C of the through hole 20 or the central axis C as the distance from the second member increases. A chamfered surface 30 having a small diameter is formed, and the chamfered surface 30 is located on the second member 14 side, and a first inclination angle α1 with respect to the first seal surface 22 in a cross section passing through the central axis C of the through hole 20. The first chamfered surface 32 that forms the first chamfered surface and the second chamfered surface that is adjacent to the first chamfered surface 32 on the opposite side of the second member 14 and forms a second inclination angle α2 that is larger than the first inclination angle α1. 34. As a result, the liquid sealing material 16 interposed between the first member 12 and the second member 14 flows toward the through hole 20 while being in contact with the first chamfered surface 32, so that the sealing surface is ensured without a gap. Therefore, sufficient sealing performance can be ensured. Furthermore, since the chamfered surface 30 includes the second chamfered surface 34 that forms the second tilt angle α2 that is larger than the first tilt angle α1, the chamfered surface 30 is compared with the case where the second chamfered surface 34 is not formed. A larger space between the through hole 20 and the liquid sealing material 16 can be prevented from reaching the through hole 20 and the liquid sealing material 16 can be prevented from adhering to the fastening bolt 18. Sealing performance can be ensured.

  Further, according to the present embodiment, the chamfered surface 30 is larger than the first chamfered surface 32 and the first chamfered surface 32 forming the first inclined angle α1 set to 30 ° with respect to the first seal surface 22. And a second chamfered surface 34 forming a second inclination angle α2 set to 75 °. Accordingly, the liquid sealing material 16 interposed between the first member 12 and the second member 14 flows toward the through hole 20 while being in contact with the first chamfered surface 32, so that sufficient sealing performance is ensured. can do. Furthermore, since the chamfered surface 30 includes the second chamfered surface 34 that forms the second tilt angle α2 that is larger than the first tilt angle α1, the chamfered surface 30 is compared with the case where the second chamfered surface 34 is not formed. A larger space between the through hole 20 and the liquid sealing material 16 can be prevented from reaching the through hole 20 and the liquid sealing material 16 can be prevented from adhering to the fastening bolt 18. Sealing performance can be ensured.

  Next, another embodiment of the present invention will be described. In the following embodiments, portions common to the above-described embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 2 is a view schematically showing a seal structure according to another embodiment of the present invention and corresponding to FIG. In FIG. 2, the chamfered surface 30 includes a first chamfered surface 32 and a second chamfered surface 40 that forms a second inclination angle α <b> 2 perpendicular to the first seal surface 22.

  Therefore, according to the present embodiment, the chamfered surface 30 is located on the second member 14 side, and forms a first inclination angle α1 with respect to the first seal surface in a cross section passing through the central axis C of the through hole 20. The first chamfered surface 32 and a second chamfered surface 40 that is adjacent to the first chamfered surface 32 on the opposite side of the second member 14 and forms a second inclination angle α2 that is larger than the first inclination angle α1. Has been. Thereby, since a larger space can be secured between the chamfered surface 30 and the through hole 20, the liquid sealing material 16 is more reliably suppressed from reaching the through hole 20, and the liquid sealing material is connected to the fastening bolt 18. Since it can prevent that 16 adheres, more sufficient sealing performance can be secured.

  As mentioned above, although the Example of this invention was described based on drawing, this invention is applied also to another aspect. For example, in the above-described embodiment, the cross-sectional shape of the chamfered surface 30 orthogonal to the central axis C of the through-hole 20 is formed in a circular shape, but the present invention is not limited thereto, and the chamfered surface is not necessarily limited to this in the cross-section orthogonal to the central axis C. The cross-sectional shape of 30 may be a polygon.

  It should be noted that the above description is merely an embodiment, and other examples are not illustrated. However, the present invention is implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Can do.

10: Seal structure 12: First member 14: Second member 16: Liquid seal material 18: Fastening bolt 20: Through hole 22: First seal surface 24: Second seal surface 26: Screw hole 30: Chamfered surface 32: First 1 chamfered surface 34: second chamfered surface C: central axis

Claims (1)

A first member having a flat first seal surface and having a through-hole penetrating in the thickness direction, a second seal surface facing the first seal surface of the first member, and a screw hole being formed A type of seal in which the second bolt is fastened to the screw hole with the fastening bolt through the through-hole in a state in which a liquid sealing material is interposed between the first seal surface and the second seal surface. In structure
The opening on the second member side of the through hole is formed with a chamfered surface that decreases the distance from the central axis of the through hole as the distance from the second member increases.
The chamfered surface is located on the second member side, and forms a first inclined angle with respect to the first seal surface in a cross section passing through the central axis of the through hole, and the first chamfered surface. On the other hand, the seal structure is composed of a second chamfered surface that is adjacent to the side opposite to the second member and forms a second inclination angle larger than the first inclination angle.

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