JPH0534376Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Technical Field) The present invention relates to a sealing structure between members that are brought into contact with each other and assembled in a sealed state, and particularly relates to a sealing structure between assembled members that has excellent durability. (Prior Art and its Problems) Conventionally, when assembling a second member having a rubber layer formed on the side surface thereof in a sealed state by bringing the end face of a second member into contact with the first member, generally, such a second member is By forming a seal portion integrally extending from a rubber layer formed on the side surface of the second member on the abutting end surface thereof, and compressing the seal portion between the first and second members. Thus, sealing between the abutting surfaces is achieved. For example, in recent years, so-called fluid-filled bushes and mounts, which have been widely adopted as vibration isolators in automobiles due to their excellent vibration-isolating properties, are members that are assembled together to form a fluid storage space. Usually, as shown in FIG. 6, in order to prevent fluid from leaking from the fluid storage space, a second member 3 is provided with a rubber layer 2 located on the side surface of the fluid storage space. A sealing rubber portion 5 is provided on the contact surface 4 and extends integrally from the rubber layer 2, and as shown in FIG.
The contact surface 7 of the first member 6 that is assembled against the
By applying pressure between the members 3 and 6, a seal between the members 3 and 6 can be ensured. However, with such a seal structure,
As is clear from FIG. 7, the two members 3 and 6 to be assembled with each other do not come into direct contact with each other, but with the seal rubber portion 5 interposed between the abutment surfaces 4 and 7, the screws are inserted. Since the sealing rubber portion 5 is tightened by a mating structure, a caulking structure, etc., the sealing performance of the abutting portion is reduced due to fatigue of the sealing rubber portion 5 due to heat, applied load, etc. This caused play to occur between the abutting surfaces 4 and 7, which caused a major problem in its durability. (Solution Means) Here, the present invention was made against the background of the above-mentioned circumstances, and its feature is that the second member has a rubber layer formed on the side surface of the first member. In a sealing structure between assembled members in which the end surfaces of the second member are brought into contact with each other and assembled in a sealed state, the rubber layer forming side edge of the abutting end surface of the second member is in the assembled state. A relief portion is provided at the bottom facing the first member with a predetermined gap therebetween, and an elastic seal portion is provided on the surface of the relief portion to protrude from the rubber layer by a predetermined height from the contact surface. When the second member is formed to extend integrally and assembled with the contact end surface of the second member in direct contact with the first member, the elastic seal portion is connected to the relief portion. The first member facing the relief portion is pressed between the first member and the second member to seal the two members. (Effect of the invention) In other words, according to the present invention, the first and second members can be assembled in a state where their abutting surfaces are in direct contact with each other, thereby making it possible to firmly assemble both members. In addition, under such an assembled state, there is a gap between the relief part provided in the second member and the contact surface of the first member that faces the relief part. The fixed elastic seal portion is interposed in a compressed state. Therefore, if such a seal structure is followed, it is possible to effectively prevent a decrease in seal performance and the occurrence of wobbling due to the elastic seal member becoming stiff, and thereby the durability of seal performance can be extremely effectively improved. That's what happens. (Examples) Hereinafter, in order to clarify the present invention more specifically, some embodiments of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows an embodiment of a sealing structure between assembly members constructed according to the present invention. In this figure, 10 and 12 are first and second metal fittings that are to be brought into contact with each other and assembled in a sealed state.Although not shown, between these two metal fittings 10 and 12 are bolts・
An assembly mechanism such as a nut structure or a caulking structure is provided so that the respective contact surfaces 14 and 16 can be assembled in a state in which they are brought into contact with each other with a predetermined pressing force. In addition, in this figure, only the cross section of the contact portion of the first and second metal fittings 10, 12 is shown, but each of the metal fittings 10, 12 may have any shape such as a cylinder or a plate. As a result, the abutment surfaces 14, 16 are formed to extend longitudinally in the circumferential direction or in a straight line. Furthermore, one end edge (the right end in FIG. 1) of the abutment surface 16 of the second metal fitting 12 is chamfered in a rounded shape. When assembled to the first metal fitting 10, with respect to the contact surface 14 of the first metal fitting 10,
Relief portions 20 facing each other with a predetermined gap in between
is formed. Furthermore, a thin rubber layer 2 is provided on the side surface of the end edge of the second metal fitting 12 where the relief portion 20 is formed.
2 is integrally provided by vulcanization adhesive or the like. The rubber layer 22 extends above the relief portion 20 and is thereby integrally fixed to the outer surface of the relief portion 20, so that the first metal fitting 10 from the contact surface 16 is A seal rubber portion 24 that protrudes by a predetermined height in the direction of assembly is formed over the entire length in the longitudinal direction. That is, when the second metal fitting 12 having such a structure is assembled to the first metal fitting 10 as described above, as shown in FIG. The contact surface 16 is brought into contact with the contact surface 14 of the first metal fitting 10, and the seal rubber portion 24 is sandwiched between the relief portion 20 and the contact surface 14 and tightened. The result is that In this embodiment, the protruding tip of the seal rubber part 24 provided on the relief part 20 is formed in a rounded shape, so that it is deformed by the pressure applied to the first metal fitting 10. Even under such conditions, the contact area and contact pressure of the first metal fitting 10 against the contact surface 16 can be effectively ensured. Therefore, in the seal structure as described above, the first and second metal fittings 10 and 12 are in a metal touch state in which they are directly abutted on their respective contact surfaces 14 and 16, and the second metal fittings 10 and 12 are Contact surface 1 of metal fitting 12
Between the relief part 20 provided in the first metal fitting 6 and the contact surface 14 of the first metal fitting 10, the seal rubber part 2
4 is pressed and assembled, the two fittings 10 and 12 are firmly contacted and assembled, and the sealing performance is not degraded or rattled due to the seal rubber part 24 becoming sagging. This can be effectively prevented from occurring, and thereby the durability of the sealing performance can be extremely effectively improved. In addition, in such a seal structure, the contact surface 14 of the first metal fitting 10 in the seal rubber portion 24
The contact pressure against, in other words, the sealing performance at the seal rubber portion 24, is determined by
12, regardless of the rigidity (strength) of the entire device, it can be changed and set as appropriate depending on the shape of the seal rubber part 24, and it can be easily set to a suitable value. It also has the following effects. Furthermore, in such a seal structure, since the first and second metal fittings 10 and 12 are in direct contact, there is a gap between the two metal fittings 10 and 12.
Even if an excessive load is applied in the direction of assembly, the effect of this load on the seal rubber portion 24 can be avoided as much as possible, thereby further improving durability. This can be achieved by Above, one embodiment of the seal structure according to the present invention has been described in detail, but in the present invention, various shapes may be adopted as the shape of the relief portion 20 in addition to the rounded shape as in the above embodiment. You can. For example, as shown in FIG. 3, it is also possible to form a relief part 26 at one end edge of the contact surface 16 of the second metal fitting 12 with a planar corner cut shape. In addition, as shown in FIG. 4, one end edge of the contact surface 16 has a rectangular notch and a relief part 28.
It is also possible to form In any of these structures, the same effects as in the first embodiment can be effectively achieved.
In addition, in the examples shown in FIGS. 3 and 4,
Members having the same structure as those in the first embodiment will be designated with the same reference numerals, and detailed explanation thereof will be omitted. metal fittings 1
0 will be omitted. By the way, it has a cylindrical shape, and the end surfaces on both sides in the axial direction are the relief parts 20, 2 having the structure as described above.
a second metal fitting 12 having abutment surfaces 16, 16 having 6, 28 and a seal rubber portion 24 formed in the relief portion;
The first and second metal fittings 10, 12 are assembled by a bolt inserted through the center thereof. We conducted a test under the following conditions and measured the sealing performance and durability.
Table 1 below shows the results of a similar test using a conventional structure that does not have such a relief part (see Figures 6 and 7). . In addition, in this table, the metal fitting shape is the second metal fitting 1.
2 shows the shape of the relief part provided in FIG. 2, in which the relief part 20 is formed with a radius of curvature of 1.0 mm as shown in Also, the relief part 26 is
It is formed with a corner face of 1.0 mm x 1.0 mm as shown in Fig.
8 means 1.0mm x 1.0 as shown in Figure 4.
It is shown that each is formed with a rectangular notch of mm in diameter. In addition, in Table 1,
The rubber shape indicates the radius of curvature of the rounded surface set on the protruding tip surfaces of the seal rubber parts 24, 5, and in particular, in this test, the abutment surfaces 16, 4 and the rubber layers 22, 2, respectively. The curvature center of the rounded surface of the seal rubber portions 24 and 5 was set at the extended intersection with the side surface on which the seal rubber portions 24 and 5 were formed. In addition, in Table 1, the sealing performance is the second metal fitting 1.
It indicates the maximum working hydraulic pressure value that can maintain liquid tightness between the contact surfaces 14, 16, 4, 7 when assembled to the first fittings 10, 6 of No. 2, 3, and further, In this table, the reliability of the fastening part is 500Kg・cm for the first and second metal fittings 10, 12, 3, and 6.
After assembling as described above with the bolt tightening torque of
The bolt tightening torque is measured again and shows the retention rate of the tightening torque, which is a calculated value calculated by (measured tightening torque) / (initial tightening torque: 500Kg・cm) x 100. be.

[Table] That is, it is easily understood from Table 1 that excellent durability can be achieved by the seal structure according to the present invention. Furthermore, in the present invention, in the second metal fitting 12 provided with the rubber layer 22 and the sealing rubber part 24 as in the above embodiment, the first metal fitting 10 is attached to the side surface on which the rubber layer 22 is formed. When the rubber layer 22 is assembled in a state in which the first metal fitting 10 is brought into contact with the rubber layer 22, as shown in FIG. Seal protrusions 30, 30 extending over the entire length in the direction may be provided. That is, by providing such seal protrusions 30, 30, the seal rubber portion 24 formed on the relief portion 20 may have defects such as missing parts, and the gap between the contact surface with the first metal fitting 10 may be damaged. Even if foreign matter such as dust is interposed between the metal parts and the sealing properties are impaired, the sealing properties between the first metal fitting 10 and the first metal fitting 10 can be compensated by the seal protrusions 30, 30.
Thereby, the reliability of sealing performance can be further improved. Note that the present invention is not to be interpreted as being limited to the specific examples described above. For example, the shapes of the first metal fitting 10 and the second metal fitting 12 are appropriately set depending on the intended product shape. In addition, in the above embodiment, the second metal fitting 12
Although the rubber layer 22 is formed on one side of the rubber layer 22, it is also possible to form a rubber layer on both sides of the rubber layer 22, thereby forming the sealing rubber portions 24 on both side edges of the contact surface 16. It is also possible to do so. Further, the shape of the protruding end surface of the seal rubber portion 24 is not limited to the rounded shape shown in the example. In addition, the dimensions of the relief parts 20, 26, 28 and the seal rubber part 24 in the members used in the above-mentioned tests of sealing performance and fastening part reliability respectively indicate the dimensions of one embodiment of the present invention. The present invention is not to be construed as being limited by the dimensions; for example, the radius of curvature of the relief portion 20 is as follows:
The corner cut size of the relief part 26 is about 0.5 to 2.0 mm, the cutout size of the relief part 28 is about 0.5 to 2.0 mm, and the radius of curvature of the seal rubber part 24 is about 0.5 to 2.0 mm. Generally, a value of about 0.3 to 2.0 mm can be suitably adopted. In addition, although not listed one by one, the present invention can be implemented with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art.
Further, it goes without saying that any such embodiments are included within the scope of the present invention as long as they do not depart from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of an assembly member having a seal structure according to the present invention, and FIG. 2 is a sectional view of a main part showing the assembled state. Also,
FIGS. 3 and 4 are sectional views of main parts showing the shape of the relief part of the second metal fitting as other embodiments of the seal structure according to the present invention, respectively. Furthermore, the fifth
The figure is a sectional view of a main part showing a second metal fitting as yet another embodiment of the seal structure according to the present invention.
Further, FIG. 6 is a sectional view of a main part showing a specific example of an assembly member having a conventional seal structure, and FIG. 7 is a sectional view of a main part showing the assembled state. 10...first metal fitting, 12...second metal fitting, 1
4...Abutting surface (first metal fitting), 16...Abutting surface (second metal fitting), 20, 26, 28... Relief part, 2
2...Rubber layer, 24...Seal rubber portion.

Claims (1)

[Scope of utility model registration request] The end face of a second member having a rubber layer formed on its side surface is brought into contact with the first member and assembled in a sealed state, and the rubber layer on the abutting end face of the second member is formed. A relief portion is provided on the forming side edge portion to face the first member with a predetermined gap in the assembled state, and a relief portion is provided on the surface of the relief portion at a predetermined height from the contact surface. An elastic seal portion is formed to extend integrally from the rubber layer, and the second member is assembled with the abutting end surface directly in contact with the first member. , an assembly characterized in that the elastic seal portion is compressed between the relief portion and the first member facing the relief portion to seal between the two members. Seal structure between parts.