JP2002122174A - Seal material for strut mount - Google Patents

Abstract

(57) [Summary] [PROBLEMS] As a strut mount sealing material, it is possible to cope with variations in dimensions on the vehicle body panel side, improve sealing characteristics, and prolong the life of sealing performance. A strut mount seal member (30) has a ring shape made of a rubber-like elastic material, and is arranged radially outside a substantially cylindrical body (31) with respect to a plane contacting a bottom portion (34) in order from the bottom in the axial direction. First void 38
And the ring-shaped first protrusion 37 and the first protrusion 3
7, a second gap 40 is formed on the upper side of the body 7 to form a ring-shaped second projection 39. When the case body is attached to the vehicle body panel, the first gap 38 prevents the first projection 37 from elastically deforming. The second protrusion 40 is formed so as to be able to substantially absorb the elastic deformation of the second protrusion 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal member used for sealing between a strut mount and a vehicle body panel in a mounting portion of a vehicle strut type suspension to a vehicle body panel.

[0002]

2. Description of the Related Art A strut mount having a structure illustrated in FIG. 7 has been developed as a strut mount used when a strut type suspension used as a shock absorber of a vehicle is mounted on a vehicle panel. I have.

The strut mount (1A) shown in FIG. 7 has the following configuration. The insulator (1)
A metal core (3) having a through hole through which a piston rod of a shock absorber is inserted is fixed to the center of the annular rubber elastic body (2) by vulcanization molding so as to embed the outer periphery thereof. The tubular reinforcing metal fitting (5) is attached to the portion. The piston rod (11) of the shock absorber
The piston rod passes through a bumper bar (12) for limiting an excessive stroke of the piston rod, is inserted into a core metal (3) of the insulator (1), and is fixed by a fastening means (13) such as a nut.

[0004] The insulator (1) includes a case body (6) having a tubular portion (6a) and a flat flange portion (6b) bent outward from the lower end of the tubular portion. Is housed. Thus, the flange portion (6b) of the case body (6)
Together with the insulator bracket (7) covering the lower opening of the case body (6), the fastener (8) such as bolts and nuts is used at several places in the circumferential direction, for example, at two to four places at equal angular intervals. It is fixed to a predetermined position of the panel (10). Below the insulator bracket (7), a support member (15) made of a plate-like body that supports the upper end of the spring (14) is arranged.

A mounting portion (17) of the vehicle body panel (10) by the fastener (8) has a flat plate shape corresponding to the flange portion (6b) of the case body (6) and has a flat shape. ) Is formed with an opening (18) having a slightly larger diameter through which the cylindrical portion (6a) is inserted, and an inner peripheral edge of the opening (18) is bent and extended upward in the axial direction to protrude. A flanged portion (19) is provided. In the case body (6), a tubular portion (6a) is inserted through the opening (18) from below, and a flange portion (6b) is sandwiched between a vehicle body panel (10) and an insulator bracket (7). And fixed.

In this mounting state, the cylindrical portion (6a) of the case body (6) and the mounting portion (1
A sealing material (50) made of a rubber-like elastic material is inserted between the cylindrical flanges (19) of (7) to prevent water, muddy water, dust, etc. from entering the inside of the vehicle body as shown in the figure. It is arranged along a bent portion from the cylindrical portion (6a) to the flange portion (6b).

Hereinafter, the structure of the conventional sealing material (50) will be described with reference to FIG.

The seal member (50) has a radially inner peripheral surface corresponding to the cylindrical portion (6a) and the flange portion (6b) of the case body (6) and the curved portion (6c) formed by a curved surface therebetween. It has a cylindrical surface portion (51) and a curved surface portion (52) that expands downward and outward. The radially outer peripheral surface of the sealing material (50) is, in order from the upper side in FIG. 7 and FIG. 55), and a larger-diameter cylindrical surface portion (57) connected to the lower surface of the curved surface portion (52) through a step-shaped protrusion (56). Department.

When such a sealing material (50) is sandwiched between the vehicle body panel (10) and the case body (6) and tightened with a fastener (8), the vehicle body panel (10) and the case body (6) are close to each other in the direction of the arrow (A1) in FIG. 8, and the vicinity of the upper end of the sealing material (50) in FIG. 8 and the step-like projections (54) and (56) are almost in the direction of the arrow (A2). Then, it is compressed and deformed, and is brought into close contact with the vehicle body panel (10) and the case body (6) by an elastic restoring force accompanying the deformation, thereby sealing the space therebetween.

Incidentally, the case body (6) can be manufactured relatively accurately, but the mounting portion (17) of the vehicle body panel (10) is provided.
Is not so high (for example, each of plus and minus about 1.1 mm), and a certain degree of variation occurs in dimensions such as the aperture diameter. Therefore, the cylindrical portion (6a) of the case body (6) and the cylindrical flange portion (19) of the opening (18) may not always be mounted as set.

For example, when the diameter of the opening (18) is larger than the designed size, the sealing material (50) is strongly compressed in one part in the circumferential direction, but is not compressed in the other part, causing a bias. Or parts that cannot be contacted,
There is a problem that the sealing performance is reduced. Further, when the diameter of the opening (18) is smaller than the designed size, the hole is excessively compressed to cause permanent deformation, and the sealing material (50) is entangled, so that the sealing life is shortened. is there.
Further, if the sealing material is entangled, there is a possibility that fastening failure due to the fastener may occur.

[0012] In view of the above, the present invention has been made in consideration of various studies including a FEM analysis (analysis by a finite element method) and the like in consideration of the above-mentioned variation in dimensions as a sealing material used for a strut mount. , Which has been repeatedly studied and made into an optimal shape that can respond to dimensional variations,
It is intended to improve the sealing characteristics and extend the life of the sealing performance.

[0013]

According to the present invention, there is provided a seal material for a strut mount, comprising: a cylindrical portion for holding an insulator of the strut mount; and a mounting flange portion extending outward from one end of the cylindrical portion. And a mounting portion of the vehicle body panel having an opening through which the cylindrical portion of the case body is inserted and having a cylindrical flange portion protruding in the axial direction at the opening edge. A ring-shaped sealing material made of a rubber-like elastic material, radially outside of the substantially cylindrical main body, in order from an axial bottom side contacting the flange portion of the case body, with respect to a plane contacting the bottom portion. And a ring-shaped first projection that is connected to and protrudes outwardly while holding the first gap portion, and a ring-shaped first projection that is connected to and protrudes outwardly and has a second gap portion above the first projection in the axial direction. With two projections When the case body is mounted on the vehicle body panel, the first gap can substantially absorb the elastic deformation of the upper first projection, and the second gap can elastically deform the upper second projection. Characterized in that it is formed so as to be able to absorb almost all of them.

The sealing material of this strut mount is brought into contact with the flange of the case body holding the insulator at the bottom, and is sandwiched between the cylindrical part of the case body and the cylindrical flange part of the mounting part of the vehicle body panel. It is used in the same manner as described above, and performs sealing action by being in close contact with both the cylindrical portion of the case body and the cylindrical flange portion of the vehicle body panel.

At this time, in the sealing material of the present invention, the first protrusion and the second protrusion are provided on the outer side in the radial direction as described above while holding the first gap portion and the second gap portion on the lower side, respectively. Therefore, the radial dimension of the sealing material can be formed larger than before, and the gap between the cylindrical portion of the case body and the cylindrical flange portion on the vehicle body panel side due to variations in manufacturing dimensions. Can easily deal with dimensional variations.

That is, when the interval is large, the first and second ring-shaped projections of the sealing material sandwiched between the cylindrical portion of the case body and the cylindrical flange portion on the vehicle body panel side are provided. A predetermined sealing state can be maintained by elastically adhering to the cylindrical flange portion at two upper and lower locations while being appropriately elastically deformed. In addition, when the distance is small, the first projection and the second projection are elastically deformed toward the first gap portion and the second gap portion below the first projection and the second projection, respectively, so that the cylinder does not bite or the like. It can be elastically adhered to the flange-like portion, and can maintain a good sealing state.

In particular, the first gap and the second gap are formed so as to substantially absorb the elastic deformation of the upper first projection and the second projection when the case body is mounted on the vehicle body panel. Therefore, even if the protrusion amounts of the first protrusion and the second protrusion are set relatively large, the first protrusion and the like do not bite.

Therefore, in the present invention, it is possible to easily cope with the dimensional variation caused by the manufacturing accuracy of the vehicle body panel, etc., to improve the sealing characteristics between the case body and the vehicle body panel, and to improve the sealing performance. Life can be extended.

In the sealing material of the present invention, it is preferable that the height of the first projection is 2 to 5 mm and the width is 1 to 4 mm. Accordingly, the radial dimension of the sealing material can be set larger than before by the first projection, and can be appropriately elastically deformed, so that the dimensional variation in manufacturing can be favorably absorbed.

Preferably, the first void has a capacity ratio of 80% or less with respect to the first projection.
Thereby, the elastic deformation of the first projection at the time of attachment can be favorably absorbed.

In the sealing material according to the present invention, the projection height of the second projection is 1 to 3 mm, and the width in the axial direction is 1 mm.
It is preferable that the thickness is set to 4 mm, whereby the radial size of the sealing material can be set larger than before by the second protrusion, and can be appropriately elastically deformed, so that the variation in the manufacturing dimensions can be favorably absorbed.

It is preferable that the capacity ratio of the second gap to the second projection is set to 80% or less, so that the elastic deformation of the second projection at the time of attachment can be favorably absorbed. It will be.

Further, in the sealing material according to the present invention, it is preferable that the first projection and the second projection are inclined obliquely upward with respect to the bottom, preferably in an angle range of 10 to 60 °. That is, when the cylindrical portion of the case body to which the sealing material is fitted is inserted into the opening on the vehicle body panel side and attached, the first projection and the second projection are projected in both directions of the direction intersecting the projection direction. As a result of the compression deformation, the adhesion to the cylindrical flange portion on the vehicle body panel side due to the elasticity of the body is increased, and further excellent sealing properties can be secured.

In the above-mentioned sealing material of the present invention, as in the invention of claim 7, on the radially inner peripheral surface of the substantially cylindrical main body,
A ring-shaped inner peripheral projection can be formed in advance. According to this sealing material, the inner peripheral projection comes into line contact with the cylindrical portion of the case body on the radially inner side, and the sealing performance is improved as compared with the case where the inner peripheral surface of the sealing material makes surface contact. can do.

The inner peripheral projection has a projection height of 0.2 mm or more and a width dimension in the axial direction of 1 mm.
mm or more, the above-mentioned sealing effect is increased.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on embodiments shown in the drawings.

FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 is a sectional view of a sealing material (30) of the first embodiment, and FIG. FIG. 3 is a cross-sectional view showing a configuration of a mount portion, FIG. 3 is a cross-sectional view showing a first modification of the seal material (30), and FIG. 4 is a cross-sectional view showing a second modification of the seal material (30). FIG. 5 is a sectional view showing a third modification of the sealing material (30).

The configuration of the strut mount shown in FIG. 2 is the same as that described in the section of the prior art. The same components are denoted by the same reference numerals, and the description thereof will not be repeated.

In FIG. 1, the sealing material (30) is formed of a rubber-like elastic material such as an elastic rubber material or a synthetic resin material. The sealing material (30) has a substantially cylindrical main body (31), and a radially inner peripheral portion of the main body (31) has a cylindrical portion (6a) of a case body (6) and a flange portion (6b). ) And a cylindrical surface (3
2) It has a bottom part (34) that forms a circular arc that is convex with respect to the curved surface part (33) and the flange part (6b) that expand below. Further, on the cylindrical surface portion (32), for example, two circumferentially continuous ring-shaped inner peripheral projections (35) and (36) spaced apart from each other in the axial direction are provided with a projection height (H1) and It has a width (W1) in the axial direction. As an example, the inner diameter of the substantially cylindrical body (31) is 60 to 90 mm, and the axial dimension is 8 to 90 mm.
When the thickness in the radial direction of the upper end is 3 to 5 mm, the protrusion height (H1) is 0.2 mm or more, and the width (W) is 14 mm.
1) is formed to 1 mm or more.

On the radially outer side of the substantially cylindrical main body (31), there is a circumferentially continuous ring-shaped projecting obliquely upward from the bottom (34) outward at an angle (θ1). The first projection (37) is formed. The first protrusion (37) has a protrusion height (H2) and an axial width (W2).
have.

For example, when the inner diameter of the substantially cylindrical body (31) is 60 to 90 mm, the axial dimension is 8 to 14 mm, and the thickness of the upper end portion in the radial direction is 3 to 5 mm, the protrusion height (H2) is The range is 2 to 5 mm, more preferably 3 to 5 mm.
The range is 4 mm. The width (W2) is 1 to 4 m
m, preferably in the range of 2 to 3 mm. The angle (θ1) is preferably 10 degrees with respect to the flange (6b).
The angle is in the range of ６０60 °, more preferably 30-45 °.

Since the first projection (37) is inclined at the angle (θ1) as described above and extends obliquely upward, the lower side of the first projection (37) is in contact with the bottom (34). A first gap (38) is formed between the first gap and the plane. First void (3
8), the capacity ratio is preferably selected from the range of 80% or less, more preferably 40 to 60% with respect to the first protrusion (37).

Further, a circumferentially continuous ring-shaped second second member extends obliquely upward from the bottom portion (34) at an angle (θ2) with an interval in the axial direction from the first protrusion (37). A projection (39) is formed. Thereby, a second gap (40) is formed between the first projection (37) and the second projection (39). That is, the first gap (38), the first projection (37), the second gap (40), and the second projection (39) are formed on the outer peripheral side of the main body (31) in this order from the bottom (34) side. Have been.

The second protrusion (39) has a protrusion height (H3)
And a width (W3). For example, when the inner diameter of the substantially cylindrical main body (31) is 60 to 90 mm, the axial dimension is 8 to 14 mm, and the radial thickness of the upper end portion is 3 to 5 mm, the protrusion height (H3) is 1 to 1. It is selected from a range of 3 mm, preferably from 1.5 to 2.5 mm. Also the second
The width (W3) of the projection (39) is selected from a range of 1 to 4 mm, preferably a range of 2 to 3 mm. In addition, the angle (θ
2) is an angle range similar to the angle (θ1).
The second void (40) has a capacity ratio of preferably 80% or less, more preferably 40 to 60%, with respect to the second protrusion (39).
Range.

In the sealing member (30), the protrusion height (H2) of the first protrusion (37) and the protrusion height (H3) of the second protrusion (39) are both the second gap portions. (Four
The projection size in the radial direction with respect to the groove bottom in (0) is used.

The capacitance ratio of the first void portion (38) to the first projection (37) is the first ratio in the cross section.
A space having a triangular cross section defined by the projection (37), a plane in contact with the bottom (34), and a vertical line drawn from the top of the first projection (37) to the plane is defined as a first void. Ratio of the volume of the first gap (38) to the volume of the first projection (37) on the protruding end side from the line connecting the intersection of the bottom (34) with the plane and the bottom of the second gap (40). And

The capacitance ratio of the second gap (40) to the second protrusion (39) is the same as the first ratio in the cross section.
A space defined by a line connecting the tops of the projections between the projection (37) and the second projection (39) is defined as a second gap (40), and the volume of the second gap (2) The ratio of the volume of the second projection (39) on the protruding end side to the line connecting the bottom of the gap (40) and the base on the upper surface side of the second projection (39) is defined.

As shown in FIG. 2, the sealing material (30) is brought into contact with the flange (6b) of the case body (6) holding the insulator (1) at the bottom portion (34), thereby forming the case body (30). The cylindrical portion (6a) and the cylindrical flange portion are fixed by inserting the cylindrical portion (6a) into the opening (18) in the mounting portion (17) on the vehicle body panel (10) side. Used between (19).

At this time, when the flange portion (6b) of the case body (6) is fastened to the vehicle body panel (10) together with the insulator bracket (7) by a fastener (8) such as a bolt, the vehicle body panel (10) and the vehicle body panel (10) The case body (6) is mutually adjacent in the direction of the arrow (A1) in FIG. 8, and the inner peripheral projections (35) and (36) of the sealing material (30), the outer peripheral first projections (37), and the second outer projections (37).
The projection (39) is compressed and deformed in the direction of the arrow (A2), and closely contacts the vehicle body panel (10) and the case body (6) to perform a sealing action.

In the use of such a sealing material (30), as described in the section of the prior art, variations in manufacturing dimensions occur in the opening (18) of the case body (6) and the body panel (10). There is a sealing material with the above configuration (30)
In, it can easily cope with the variation in the dimensions,
A good seal state can be maintained.

A first modification of the seal member (30) shown in FIG. 3 is that the cylindrical portion (6a) of the case body (6) due to the variation in the dimensions described above and the cylindrical flange portion on the vehicle body panel (10) side. This is the case where the interval dimension (S) between (19) is large. In this case, the inner projections (35) and (36) and the first projections (37)
The second projection (39) is slightly compressed and deformed over its entire circumference, and elastically adheres to the cylindrical portion (6a) and the cylindrical flange portion (19), and in particular, the ring-shaped first projection (39). Protrusion (37)
The second protrusion (39) and the second flange (39) are in close contact with the cylindrical flange portion (19) at two locations above and below, so that the case body (6) and the vehicle body panel (10) can be sealed well.

The second modification of the seal member (30) shown in FIG. 4 is based on the case where the distance dimension (S) between the cylindrical portion (6a) and the cylindrical flange portion (19) is small due to the above-mentioned variation in dimensions. It is. In this case, each of the inner peripheral projections (35) (36), the first
The projections (37) and the second projections (39) are compressed in more stages over substantially the entire circumference than in the case of FIG. 3, and the first projections (37) and the second projections (39) are respectively shown in FIG. It is elastically deformed to the lower side, and the most part is pushed into the first gap part (38) and the second gap part (40) without being caught in the case body (6) and the vehicle body panel (10). Has become. In the case of FIG. 4, the first gap (38) and the second gap (40) are substantially filled with the deformed portions of the first projection (37) and the second projection (39), and are wide. In this range, both the case body (6) and the vehicle body panel (10) are in close contact with each other, thereby maintaining a good sealing state.

In particular, when the first gap (38) and the second gap (40) are attached to the case body (6) to the vehicle body panel (10), respectively, the upper first projection (3) is formed.
7) and the second projection (39) are formed so as to be able to substantially absorb the elastic deformation thereof, so that the projection amounts of the first projection (37) and the second projection (39) are set to be relatively large. Also, the first projection and the like do not bite.

In a third modification of the sealing material (30) shown in FIG. 5, the distance (S) due to the above-mentioned variation is different from that of FIG.
4 and FIG. 4. In this case, the inner projections (35) and (36), the first projections (37) and the second projections (39) are provided on the entire circumference at an intermediate level between the cases of FIG. 3 and FIG. The first protrusion (37) and the second protrusion (39) are elastically deformed downward, and are pushed into the lower first gap (38) and second gap (40), respectively. As a result, both the case body (6) and the vehicle body panel (10) are brought into close contact with each other to achieve a sealing function.

In the present embodiment, when the interval (S) is such an intermediate value, the first protrusion (37) and the second protrusion are provided in the first gap (38) and the second gap (40). Residual gaps (41) and (42) that are not completely filled in the deformed portion of (39) occur. That is, the first protrusion (37) and the second protrusion (39) can be further deformed within a range that does not cause permanent deformation, and even when the space dimension (S) is further reduced, this fluctuation is absorbed and a good seal is obtained. Can maintain sex. Also the first protrusion (37)
In addition, since the deformation of the second protrusion (39) is performed within a range that does not cause permanent deformation, it is possible to achieve a longer life of the sealing material.

In this embodiment, the case body (6)
The cylindrical body (6a) and the cylindrical flange (19) on the vehicle body panel (10) having a distance (S) of 9.2 to 7.8 mm are used as the substantially cylindrical body. When the inner diameter of (31) is 60 to 90 mm, the axial dimension is 8 to 14 mm, and the radial thickness of the upper end is 3 to 5 mm, the projection height (H2) of the first projection (37) is 2 to 2. 5 mm.

Accordingly, the radial dimension of the sealing material (30) can be set larger than before, and the first projection (37) can be elastically deformed appropriately, and the above-mentioned dimensional variation in manufacturing can be well absorbed. it can. That is, when the projection height of the first protrusion (37) is less than 2 mm, the effect of absorbing the dimensional variation is reduced. On the other hand, when the protrusion height (H2) of the first protrusion (37) exceeds 5 mm, the first protrusion (37) is strongly compressed between the cylindrical portion (6a) and the cylindrical flange portion (19). There is a possibility that the first projection (37) may be bent and broken or may be bitten, so that a good sealing effect cannot be maintained. Therefore, in the case of the size, the first
The projection height of the projection (37) is particularly preferably in the range of 3 to 4 mm.

In this embodiment, the first gap (3
8) The capacity ratio of the first projections (37) to the first projections (37) is set to 80% or less, preferably 40 to 60%. That is, if the capacity ratio is 80% or less, the compressed and deformed first projection (37) is pushed in a compressed state,
A strong elastic restoring force associated with the compressive deformation of the first projection (37) can be maintained, whereby the adhesion to the cylindrical flange portion (19) and the like can be maintained satisfactorily and the sealing can be reliably performed.
If the capacity ratio of the first gap (38) to the first projection (37) exceeds 80%, the deformed portion of the first projection (37) that has been compressed and deformed is pushed into the first gap (38). The first projection (37) is not pushed back by a strong elastic force, and the adhesion force due to the elastic restoring force of the first projection (37) is reduced. On the other hand, if the capacity ratio is too low, the ratio of the deformed portion of the first projection (37) that cannot enter the first gap portion (38) increases, so that biting and permanent deformation are likely to occur,
The elastic adhesion decreases, making it difficult to maintain the sealing performance. Therefore, the capacity ratio is particularly preferably in the range of 40 to 60%.

In this embodiment, the cylindrical portion (6a) of the case body (6) and the cylindrical flange portion (1) on the vehicle body panel (10) side are used.
The inner diameter of the substantially cylindrical main body (31) is set to 60 when it is used when the distance (S) from 9) is 9.2 to 7.8 mm.
90 mm, the axial dimension is 8 to 14 mm, and the thickness at the upper end in the radial direction is 3 to 5 mm.
9) The protrusion height (H3) is in the range of 1 to 3 mm, and the width (W)
3) is in the range of 1 to 4 mm. Thereby, the radial dimension of the sealing material (30) can be set larger than before by the second projection (39), and the second projection (39) can be appropriately elastically deformed. Can be favorably absorbed and the sealing property can be improved.

That is, when the projection height (H3) of the second projection (39) is less than 1 mm, the amount of elastic deformation is small, and when it exceeds 3 mm, the second projection (39) is excessively compressed. As a result, the second projection (39) is liable to be damaged or bitten due to bending, and a good sealing effect cannot be maintained. Therefore, in terms of such effects,
The projection height of the second projection (39) is particularly preferably in the range of 1.5 to 2.5 mm.

If the width (W3) of the second projection (39) is less than 1 mm, it is likely to bend and break, and if it exceeds 4 mm, it is difficult to elastically deform, and the responsiveness to the dimensional variation and the sealing property are poor. become worse. Therefore,
From the viewpoint of such an effect, the width of the second protrusion (39) should be 2-3.
Those in the range of mm are particularly preferred. The same applies to the first protrusion (37).

In this embodiment, the second gap (4
The capacity ratio of (0) to the second protrusion (39) is set to 80% or less, preferably 40 to 60%. That is, if the capacity ratio is 80% or less, the compressed and deformed second projection (39) is pushed in a compressed state,
A strong elastic restoring force associated with the compressive deformation of the second projection (39) can be maintained, whereby good adhesion to the cylindrical flange (19) and the like can be maintained, and a good seal can be realized. When the capacity ratio of the second gap portion (40) to the second projection (39) exceeds 80%, the compression-deformed second projection (3
The deformed portion of (9) is simply pushed into the second gap (40) and is not pushed back by a strong elastic force, and the adhesion force due to the elastic restoring force of the second protrusion (39) is reduced. On the other hand, if the capacity ratio is too low, the ratio of the deformed portion of the second projection (39) that cannot enter the second gap (40) increases, so that biting and permanent deformation are likely to occur,
The elastic adhesion decreases, making it difficult to maintain the sealing performance. Therefore, the capacity ratio is particularly preferably in the range of 40 to 60%.

In the present embodiment, the angles (θ1) and (θ2) of the first projection (37) and the second projection (39) with respect to a plane contacting the bottom (34) are 10 to 60 °.
Preferably, the angle is in the range of 30 ° to 45 ° and is obliquely upward. Therefore, the first projections (37) and the second projections (39) have strong adhesion to the cylindrical flange portion (19) due to the elasticity of the first projections (37) and the second projections (39), so that good sealing properties can be secured.

Here, the angle (θ1) (θ2) is 10
When it is less than °, the first protrusion (37) and the second protrusion (39)
Although compression deformation tends to occur in the axial direction intersecting the protruding direction, compression deformation is difficult in the protruding direction. Therefore, the first projections (37) and the second projections (39) cannot obtain a sufficient adhesion due to radial elasticity. on the other hand,
When the angles (θ1) and (θ2) exceed 60 °, the first protrusions (37) and the second protrusions (39) are easily deformed to the upper side by the compression deformation, and the first protrusions (37) and the lower first protrusions (39) during the compression deformation. It is difficult to enter the gap (38) and the second gap (40). As a result, both the first projection (37) and the second projection (39) are excessively compressed and cause permanent deformation, which causes a problem such as a reduction in sealing performance. Therefore, in view of such effects, the angle is particularly preferably in the range of 30 to 45 °.

In this embodiment, the sealing material (30)
The inner peripheral projections (35) and (36) of the case body (6)
Good sealing action is achieved by line contact with b). In particular, since the inner peripheral projections (35) and (36) have a protruding height (H1) of 0.2 mm or more and a width (W1) of 1 mm or more, the sealing effect is well maintained.
That is, if the protrusion height (H1) is less than 0.2 mm, sufficient sealing properties cannot be obtained, and the width dimension (W1) is not sufficient.
If 1) is less than 1 mm, sufficient sealing properties cannot be obtained.

FIG. 6 shows a sealing material (30) according to a second embodiment of the present invention.
It is sectional drawing of a). This embodiment is similar in basic configuration to the first embodiment, and the corresponding portions are denoted by the same reference characters and detailed description thereof will not be repeated.

The feature of the structure of the seal member (30a) of this embodiment which is different from that of the first embodiment is that the inner peripheral projections (35) and (36) similar to the first embodiment are formed on the inner peripheral surface in the radial direction. A step (44) extending from the bottom (34) to the upper side in FIG. 6 is formed on the radially outer peripheral side of the substantially cylindrical main body (31), and the step (44) is connected to the step (44). 34), the ring-shaped first protrusion (37a) extending obliquely upward at an angle (θ11) smaller than the angle (θ1) in the first embodiment is provided with a predetermined protrusion height (H12) and width (W12). ), And the first gap portion (38) is formed by the step portion (44) and the first projection (37a).
a) is formed. An angle (θ12) smaller than the angle (θ2) from the bottom (34) is spaced from the first protrusion (37a) in the axial direction.
A ring-shaped second protrusion (39a) extending obliquely upward with an inclination is formed with a protrusion height (H13) and a width (W13), and the first protrusion (37a) and the second protrusion (39a) are formed. A second gap (40a) is formed therebetween.

Here, the protrusion height (H) of the first protrusion (37a)
12) and the width (W12), and the projection height (H13) and the width (W13) of the second projection (39a) are the same as those of the first embodiment.
Projection height (H1) of projection (37a) and second projection (39a)
(H2) and the widths (W1) and (W2) are formed under the same conditions, and the first gap (38a) and the second gap (40a) are described in the first embodiment. The setting conditions of the first gap portion (38) and the second gap portion (40), in particular, the capacitance ratio between the first projection and the second projection are also formed under the same setting conditions as in the first embodiment.

Therefore, also in the present embodiment, the same operation and effect as those described in the first embodiment can be realized.

The present invention is not limited to the above embodiments, but has a wide variety of modifications without departing from the spirit of the present invention. In particular, the dimensions of the seal materials (30) and (30a) in each of the above embodiments are examples of the embodiment of the present invention, and various structures of the strut mount using the seal materials (30) and (30a) are used. Corresponding to the example, a plurality of ring-shaped projections provided on the radially outer side of the substantially cylindrical main body (31) are appropriately formed with a gap portion in which most of the deformed portion is movable when compressed. With this configuration, the above-described wide variation can be realized.

[0061]

As described above, according to the seal material of the strut mount of the present invention, the first projection and the second projection have the first gap portion and the second gap portion on the lower side in the radial direction, respectively. Since the sealing member is provided and held, the radial dimension of the sealing material can be formed larger than before, and the cylindrical portion of the case body and the cylindrical portion on the vehicle body panel side due to variations in manufacturing dimensions. It can easily cope with variations in the distance between the flange and the flange.

In particular, when the interval is large, the ring-shaped first projection and the second projection are elastically adhered to the cylindrical flange portion on the vehicle body panel side at two upper and lower portions. A predetermined sealing state can be maintained, and when the gap size is small, the first protrusion and the second protrusion are elastically deformed toward the first gap portion and the second gap portion below the first projection, respectively. The sealing state can be favorably maintained by elastically contacting the cylindrical flange portion without causing biting or the like.

In particular, the first gap and the second gap are formed so as to be able to substantially absorb the elastic deformation of the upper first projection and the second projection when the case is attached to the vehicle body panel. Therefore, even if the protrusion amounts of the first protrusion and the second protrusion are set relatively large, the first protrusion and the like do not bite.

Therefore, in the present invention, it is possible to easily cope with dimensional variations caused by manufacturing accuracy of the vehicle body panel, etc., to improve the sealing characteristics between the case body and the vehicle body panel, and to improve the sealing performance. Life can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of a part of a sealing material according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a strut mount portion using the sealing material.

FIG. 3 is a sectional view showing a first modification of the sealing material.

FIG. 4 is a sectional view showing a second modification of the sealing material.

FIG. 5 is a sectional view showing a third modification of the sealing material.

FIG. 6 is a sectional view of a sealing material according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of a strut mount portion using a conventional sealing material.

FIG. 8 is a sectional view of a part of a conventional sealing material.

[Explanation of symbols]

(1A) Strut mount (1) Insulator (2) Rubber elastic body (6) Case body (6a) Cylindrical part (6b) Flange part (6c) Bend part (7) Insulator bracket (8) Fastener (10) Vehicle body Panel (11) Piston rod (17) Body panel mounting part (18) Open hole (19) Cylindrical flange part (30) (30a) Seal material (31) Substantially cylindrical body (32) Cylindrical surface part (33) Curved surface (34) Bottom (35) (36) Inner circumference protrusion (37) (37a) First protrusion (38) (38a) First void (39) (39a) Second protrusion (40) (40a) 2 voids (41) (42) Residual gap (44) Step (H1) (H11) Projection height of inner peripheral projection (H2) (H12) Projection height of primary projection (H3) (H13) Second Projection height of protrusion (W1) (W11) Width of inner protrusion (W2) (W12) Width of first protrusion (W3) (W13) No. The width of the projections (θ1) (θ11) angle to the plane in contact with the first angle to the plane in contact with the bottom of the projections (θ2) (θ12) the bottom portion of the second protrusion

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D001 AA17 BA02 DA04 DA08 3J040 AA11 AA17 BA03 EA06 EA16 FA05 HA03 HA30 3J069 AA50 CC34 DD39

Claims (8)

[Claims] A case body having a cylindrical portion for holding an insulator of a strut mount and a mounting flange portion extending outward from one end thereof, and the cylindrical portion of the case body is inserted. A ring-shaped sealing member made of a rubber-like elastic material, which is disposed between the mounting portion of the vehicle body panel having an opening and having a cylindrical flange portion protruding in the axial direction at the opening edge, On the radially outer side of the substantially cylindrical body, in order from the bottom side in the axial direction contacting the flange portion of the case body, a ring shape which is connected to a plane contacting the bottom portion and has a first gap portion and protrudes outward. And a ring-shaped second projection which is connected to the first projection in the axial direction above and has a second gap portion and projects outward. The first projection is formed on a vehicle body panel. In the attached state, the first gap portion A seal material for strut mounts, characterized in that the elastic deformation of the first protrusion on the upper side can be substantially absorbed, and the second gap portion is formed so as to substantially absorb the elastic deformation of the second protrusion on the upper side. . 2. The seal material for a strut mount according to claim 1, wherein the projection height of the first projection is set to 2 to 5 mm and the width is set to 1 to 4 mm. 3. The seal material for a strut mount according to claim 1, wherein a capacity ratio of the first gap portion to the first projection is set to 80% or less. 4. The seal material for a strut mount according to claim 1, wherein the projection height of the second projection is set to 1 to 3 mm and the width is set to 1 to 4 mm. 5. The strut mount sealing material according to claim 1, wherein a capacity ratio of the second gap to the second projection is set to 80% or less. 6. The strut according to claim 1, wherein the first protrusion and the second protrusion are obliquely upward with respect to the bottom in an angle range of 10 to 60 °. Seal material for mounting. 7. The seal material for a strut mount according to claim 1, wherein a ring-shaped inner peripheral projection is formed on a radially inner peripheral surface of the substantially cylindrical main body. 8. The inner peripheral projection has a height of 0.2 mm or more,
The seal material for a strut mount according to claim 7, wherein the width is 1 mm or more.