JPH06300076A - Seal part of strut mount and method for forming seal part - Google Patents

Abstract

PURPOSE:To improve the sealing property, durability and vibration control characteristic by forming a seal member having the excellent heat resistance and ozone resistance on the surface of a fixture after electrodeposition. CONSTITUTION:A strut mount is formed of an inner cylindrical body, an outer cylindrical body 2, an elastic body for connecting both the cylindrical bodies, an annular fitting flange 4, which is projected from the outer cylindrical body 5 outward in the radial direction and connected to the lower surface of a car body panel 6, and an annular seal member 5 fixed to the top surface of the annular fitting flange 4. The car body panel 6 is formed with an annular opening 61. An inner peripheral flange surface 41a, an outer peripheral flange surface 43a and an upward taper surface 42a for forming a recessed stage part 44 between both the flange surfaces are formed on the top surface of the fitting flange over the whole of a circumference thereof, and the seal member 5 made of silicon rubber is fixed to the upward taper surface 42a. A downward taper surface 62a, which is positioned opposite to the upward taper surface 42a to pinch the seal member, is formed at the inner peripheral edge of the opening over the whole of the circumference. Liquid type silicon rubber at a predetermined viscosity is injected from a nozzle for coating, rotating the fitting flange, thereafter, the silicon rubber is solidified and hardened to form a seal member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal portion of a dust seal which is sandwiched between a strut mount used for a strut type suspension of an automobile and a vehicle body panel and a method for forming the seal portion.

[0002]

2. Description of the Related Art Conventionally, as a seal portion of this type of strut mount, when an elastic body is integrally vulcanized with an inner cylinder and an outer cylinder, the seal portion is simultaneously formed by the vulcanization molding. Things are known (eg Japanese Patent Fair 3
-61857 gazette). This one has a housing groove formed on the entire outer circumference of the outer cylinder at the boundary between the mounting flange projecting radially outward from the outer circumference of the outer cylinder and the outer cylinder, and The through hole is formed through the wall surface of the outer cylinder defining the housing groove, and a part of the vulcanized rubber is made to flow into the housing groove through the hole during vulcanization molding of the elastic body. ,
The vulcanized rubber is used to integrally form a seal member protruding upward from the accommodation groove.

[0003]

However, in the case of the seal portion of the conventional strut mount, because of the structure, a groove portion is formed between the outer periphery of the lower end of the outer cylinder and the seal member. Water and dust easily collect on the body, and when assembled to the vehicle body panel, the dust and the like are attached in a state of being caught between the seal member and the surface of the mounting portion on the body panel side. There is a risk of lowering.

On the other hand, the metal fittings such as the above-mentioned mounting flanges are generally subjected to a coating treatment by a dipping coating method or a spray coating method for the rust prevention treatment. Further, it is required to improve the flatness and the corrosion resistance of the surface of the metal fitting after the rust prevention treatment, and based on this requirement, it is desired to change the coating method to the cationic electrodeposition coating method. That is, in the case of dipping coating, since the flatness of the surface of the mounting flange abutting on the vehicle body panel side cannot be expected to be so high, the high frequency vibration isolation characteristic is deteriorated due to poor adhesion with the vehicle body panel side. In addition, in the case of the above-mentioned dipping coating, it cannot be expected that the corrosion resistance is very high, so that the durability cannot be so high. Therefore, there is a demand for a change to a cationic electrodeposition coating which can be expected to have a high level of flatness and can achieve higher corrosion resistance. However, the cationic electrodeposition coating method requires baking at a higher temperature than the dipping coating method, and thus the cationic electrodeposition coating method cannot be applied after the rubber is vulcanized and adhered to the metal fitting. There is inconvenience.

However, considering only the application of the above-mentioned cationic electrodeposition coating, a seal member which is vulcanized and molded separately from the elastic body is retrofitted to the metal fitting after the cationic electrodeposition coating by using an adhesive. It is conceivable (for example, Japanese Unexamined Patent Publication No.
-57709, JP-A-3-7012). However, in this case, a mold for molding the seal member is additionally required, and the number of steps for molding is added, which complicates the work and causes an increase in cost.

Further, in the case of the conventional strut mount seal part in which the seal member is formed by vulcanization molding simultaneously with the vulcanization molding of the elastic body, since the seal member is formed of the same natural rubber as the elastic body, For example, there is a problem that heat is easily generated from a vehicle body heated by direct sunlight in midsummer to cause thermal deterioration, or a crack is likely to be generated due to ozone attack, so that sealing performance is likely to be deteriorated.

The present invention has been made in view of such circumstances, and an object thereof is to provide a seal member excellent in heat resistance, ozone resistance and the like on the surface of a metal fitting after electrodeposition coating in a reduced number of steps. It is to be formed without causing an increase, and it is possible to improve the sealing property, the durability, and the vibration damping property.

[0008]

In order to achieve the above object, the invention according to claim 1 is, as a strut mount, an inner cylinder having a cylinder axis oriented in the up-down direction, and an outer cylinder surrounding the inner cylinder. Body, an elastic body connecting the two, an annular mounting flange integrally formed on the outer peripheral portion of the outer cylindrical body and protruding outward in the radial direction, and an annular shape provided on one of the upper and lower surfaces of the mounting flange. And a seal member. An annular opening for inserting the outer cylinder is formed in a vehicle body panel to which the strut mount is attached, and the seal member is provided between the vehicle body panel near the annular opening and one surface of the mounting flange. It is assumed that the objects are sandwiched between. In this structure, on one surface side of the mounting flange, an inner peripheral side flange surface, an outer peripheral side flange surface, and an inner peripheral surface of the inner peripheral side flange surface extend obliquely downward to the outer side in the radial direction. A first tapered surface that forms a step over the entire circumference is formed between the peripheral side flange surface and the outer peripheral side flange surface. Then, the seal member is formed and attached in a band shape in a state where an elastomer other than natural rubber is cured on the entire circumference of the first tapered surface. In addition, a second taper surface extending diagonally upward inward in the radial direction is formed in the opening of the vehicle body panel so as to face the first taper surface and sandwich the seal member in the obliquely vertical direction therebetween. The structure is formed over the circumference.

According to a second aspect of the present invention, in the first aspect of the invention, the elastomer is made of silicone.

According to the third aspect of the present invention, the strut mount has an inner cylindrical body, an outer cylindrical body surrounding the inner cylindrical body, an elastic body connecting the both, and an outer peripheral portion of the outer cylindrical body. And a ring-shaped sealing member fixed to one surface of the mounting flange. The sealing member is sandwiched between the sealing member and the vehicle body panel. It is assumed that the seal part of the strut mount is formed. In this one,
The configuration includes a preparation step, a coating step, and a curing step. That is, as a preparatory step, a nozzle into which a liquid elastomer other than natural rubber having a predetermined viscosity is poured is arranged close to the tapered surface of the mounting flange. As the next coating step, while pouring the elastomer from the nozzle while relatively moving the nozzle and the mounting flange so that the nozzle relatively moves in the circumferential direction along the tapered surface, the pouring elastomer is taped to the taper. Apply along the surface. Then, in the curing step, the applied elastomer is cured and fixed to the tapered surface. .

Further, the invention according to claim 4 is the same as claim 3
In the invention described above, the elastomer is composed of silicone.

[0012]

With the above construction, in the invention according to claim 1,
The seal member formed on the first taper surface on one surface side of the mounting flange on the strut mount side applies a compressive force diagonally up and down with respect to the mounting flange side by the second taper surface formed on the vehicle body panel side. Since it is sandwiched in the received state, the close contact between the vehicle body panel and the seal member is surely achieved. Moreover, since the seal member is formed of an elastomer other than natural rubber that is an elastic vulcanization molding material, it has excellent heat resistance and ozone resistance compared to the case of forming it by natural rubber, and has a long-term sealing performance. It is maintained and durability is improved.

According to the second aspect of the present invention, since silicone is used as the elastomer, the above-described action according to the first aspect of the present invention can be reliably obtained, and in addition, the heat resistance and ozone resistance are particularly excellent, and the durability and the seal are excellent. It is possible to improve the sex.

Further, in the invention according to claim 3, in the coating step after the preparation step, the nozzle and the mounting flange are relatively moved while pouring a liquid elastomer having a predetermined viscosity from the nozzle, whereby the mounting flange The liquid elastomer is applied and adheres in a strip shape on one surface along the relative movement locus of the nozzle. And
In the curing step, the liquid elastomer is surface-adhered to the mounting flange due to its own weight and is cured, so that the sealing member is fixed on the mounting flange. Therefore, there is no need for a mold or the like for forming the seal member, and since the liquid elastomer is applied by moving the nozzle and the mounting flange relative to each other, the seal member can be securely and easily placed at a predetermined forming position. In addition to being formed, it is possible to freely set the forming position. Moreover, even if the above-mentioned mounting flange is subjected to a process such as cationic electrodeposition coating in advance, the die for forming the seal member and the man-hours for vulcanization molding are unnecessary, and the seal member is not attached to the mounting flange. There is no need for man-hours for bonding. For this reason, the vibration-proof characteristics without increasing the number of steps,
It is possible to improve durability and sealing performance.

Further, according to the invention of claim 4, since silicone is used as the elastomer, the effect of the invention of claim 3 can be reliably obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a strut mount according to an embodiment of the present invention, in which 1 is an inner cylinder whose cylinder axis X is oriented in the vertical direction of the vehicle, and 2 is an inner cylinder which surrounds the inner cylinder 1 coaxially. An outer cylindrical body 3, a cylindrical elastic body that connects the two 1, 2 are integrally formed with the outer cylindrical body 2, and an annular mounting flange 5 projecting radially outward from the outer periphery of the lower end of the outer cylindrical body 5, An annular seal member provided on the upper surface of the mounting flange 4 is a vehicle body panel to which the mounting flange 4 is mounted.

The inner cylindrical body 1 has a bulging portion 1a formed by radially bulging an intermediate portion in the cylinder axis X direction (vertical direction in FIG. 2; hereinafter simply referred to as vertical direction). The bulging portion 1a is in a state in which the inner cylindrical body 1 and the elastic body 3 are integrally vulcanized and bulged outward from the inner peripheral surface side of the elastic body 3, whereby The holding force of both 1 and 3 in the vertical direction is strengthened. Then, a strut rod (not shown) is internally provided in the inner cylinder 1 so that the inner cylinder 1 is connected to the wheel side.

As shown in detail in FIG. 3, the mounting flange 4 has an annular inner peripheral side flange portion 41 that extends radially outward from the outer periphery of the lower end of the outer cylindrical body 2, and the inner peripheral side flange portion. An annular tapered wall portion 42 extends obliquely downward from the outer periphery of the outer peripheral portion 41 toward the outer side in the radial direction, and an outer peripheral side flange portion 43 of a predetermined shape that extends radially outward from the periphery of the tapered wall portion 42. Then, on the upper surface side of the mounting flange 4, an inner peripheral side flange surface 41a is formed by the inner peripheral side flange portion 41, and a first taper surface is formed by the taper wall portion 42 in an obliquely upward direction with respect to the outer side in the radial direction. And an outer peripheral side flange surface 43a are formed by the outer peripheral side flange portion 43, respectively, and the outer peripheral side flange surface 43a is formed in the radial direction as a stepped portion at the intersection of the upward tapered surface 42a and the outer peripheral side flange surface 43a. A concave step portion 44 is formed over the entire circumference so as to face obliquely upward with respect to the outside.

The outer cylindrical body 2 and the mounting flange 4 are integrally formed as an outer metal fitting 7 by means of press molding or the like, and the whole thereof is subjected to cationic electrodeposition coating. The seal member 5 is formed on the entire upper surface of the mounting flange 4 after the cationic electrodeposition coating along the concave step portion 44. The seal member 5 is made of silicone rubber that is hardened to a predetermined hardness, and extends over the taper surface 42a and the outer peripheral flange surface 43a that form the recessed step portion 44.
It is formed in a state of being fixed to 3a.

A circular opening 61 is formed at a mounting position of the strut mount of the vehicle body panel 6 so as to penetrate therethrough, and the opening 61 is a concave step portion 44 of the mounting flange 4.
Has an inner diameter corresponding to. A bent edge 62 bent obliquely upward inward in the radial direction from the opening edge portion is formed over the entire circumference of the opening 61, and the lower surface of the bent edge 62 is opposed to the upward tapered surface 43a. A downward taper surface 62a is formed as a facing second taper surface. Then, by tightening with bolts / nuts 8, 8, 8 penetrating both the outer peripheral side flange surface 42a of the flange 4 and the lower surface of the vehicle body panel 6, the downward taper surface 62a is fixed. The seal member 5 is compressed and deformed to the side of the upward taper surface 43a, and the seal member 5 is sandwiched so as to fill the space between the downward taper surface 62a and the upward taper surface 43a. These upward taper surfaces 43a,
The seal member 5 and the downward tapered surface 62a constitute a seal portion. In FIG.
Is an engaging edge, and the engaging edge 31 protrudes outward in the radial direction from the outer peripheral edge of the lower end of the elastic body 3 and is formed on the inner peripheral side flange portion 4.
It is adapted to engage with the lower surface of 1. The metal plate 9 is attached to the engagement edge 31 to reinforce the engagement.

Further, in the figure, 10 is an outer peripheral side flange portion 4
An annular block 11 is provided so as to be in contact with the lower surface of 2, and 11 is an annular holding fitting for attaching the block 10 to the attachment flange 4. The holding metal fitting 11 is arranged on the lower surface side of the mounting flange 4 and fixed to the lower surface of the outer peripheral side flange portion 42 by welding or the like. Then, the block 10 is held by being externally fitted to the holding metal fitting 11,
The block 10 is adapted to fix the upper end of the suspension spring 12 in a state of being slightly fitted in the upper end of the suspension spring 12.

Next, a method for manufacturing the strut mount will be described.

First, the elastic body 3 is integrally vulcanized and molded with the inner tubular body 1, while the outer metal fitting 7 including the outer tubular body 2 and the mounting flange 4 is formed by, for example, press working. The outer metal fitting 7 is subjected to cation electrodeposition coating, and after cooling, the seal member 5 is formed. Then, the elastic body 3 integrated with the inner cylindrical body 1
Are press-fitted into the outer metal fitting 7 and are coupled to each other.

The formation of the seal member 5 is performed by a forming step 13 shown in FIG. 4, for example, in a preparation step, a coating step and a curing step. The forming device 13 basically includes a head portion 15 supported by an upper frame 14 and a holding portion 17 supported by a lower frame 16. The head portion 15 is held by a vertical guide rail 14a provided on the upper frame 14 so as to be vertically movable, and is supported so as to be swingable about a horizontal axis Y. A nozzle 18 is projected downward from the lower end of the head portion 15, and the nozzle 18 is adapted to discharge the liquid silicone rubber having a predetermined viscosity which is pressure-fed from the storage tank 19. On the other hand, the holding portion 17 is rotated around the vertical axis Z by driving the motor 20 while holding the outer metal fitting 7. The liquid silicone rubber is set in a semi-fluid state having a viscosity that allows build-up by pouring (for example, a viscosity of about 250,000 cP). Specifically, a solventless silicone type 1207B (stock Company ThreeBond product name) is used.

Then, the mounting flange 4 is attached to the holding portion 17.
The head part 1 is held with its upper surface facing upward.
The nozzle 18 is set at a predetermined position so as to face the recessed step portion 44 of the mounting flange 4 by adjusting the vertical position and the swinging angle of the nozzle 5, and a preparatory step is performed. The nozzle 18
As shown in detail in FIG. 5, they are arranged so as to be close to and face the upward tapered surface 42a in the vicinity of the recessed step portion 44. At this time, the pouring direction of the nozzle 18 with respect to the mounting flange 4 is adjusted according to the shape of the seal member 5 to be formed, for example, as shown in FIG.
It may be changed within the range indicated by the chain double-dashed line, or may be inclined with respect to the rotation direction around the vertical axis Z.

Next, the pouring of the liquid silicone rubber from the nozzle 18 is started and the motor 20 is driven to rotate the outer metal fitting 7 once to perform the coating step. As a result, a band made of semi-fluid silicone rubber is applied over the entire circumference of the upward taper surface 42a, and the applying step returns to the initial pouring start position and the band continues so that the pouring and rotating are continued. Stop operation.

Finally, a curing step of curing the silicone rubber at room temperature while holding it in the holding portion 17 or taking it out from the holding portion 17 is performed. Through this curing step, the silicone rubber adheres to the upward taper surface 42a and the outer peripheral side flange surface 43a forming the concave step portion 44, and a predetermined elongation deformation (for example, elongation deformation of 400%).
Is cured to the extent possible. As a result, the sealing member 5 is formed on the upper surface of the mounting flange 4 in a fixed state.

Next, the operation and effect of the seal portion of the strut mount having the above structure will be described.

The seal member 5 has an upward taper surface 42a.
And the sealing member 5 is formed on the vehicle body panel 6.
Since it is sandwiched by the downward taper surface 62a in a state of being compressed diagonally in the vertical direction, the vehicle body panel 6 and the seal member 5 can be surely brought into close contact with each other. Moreover,
At the time of joining the outer peripheral side flange surface 43a to the lower surface of the vehicle body panel 6, the seal member 5 has the downward tapered surface 62a.
Since it is pushed by and is compressed and deformed obliquely upward along the upward taper surface 42a, it is possible to prevent biting between the outer peripheral side flange surface 43a of the seal member 5 and the lower surface of the vehicle body panel 6. Therefore, the outer peripheral side flange surface 43a tightened by the bolt 8 and the lower surface of the vehicle body panel 6 can be securely bonded to each other. Accordingly, in combination with the close contact between the joint surfaces to the vehicle body panel 6, it is possible to reliably block the intrusion of water and dust from the outside of the vehicle body into the inside of the seal member 5. Moreover, since the seal member 5 is formed of silicone rubber rather than natural rubber which is the vulcanization molding material for the elastic body 3, it is particularly excellent in heat resistance and ozone resistance, and maintains sealing performance for a long time and is durable. It is possible to improve the sex.

The seal member 5 is formed by pouring liquid silicone rubber having a predetermined viscosity from a nozzle 18 while moving the mounting flange 4 along the site where the seal member 5 is formed. Since this is done by curing, a mold for forming the seal member is not required, and the man-hours such as molding using this mold, demolding and deburring are omitted. In addition, the number of man-hours for adhering the seal member after the die molding can be omitted. In addition, while the liquid silicone rubber is poured out by the nozzle 18, the seal member 5 is formed by rotating the mounting flange 4 side, so that the seal member 5 is surely formed in the perfect circle position. Since the mounting flange 4 can be rotated in a predetermined manner, the work can be easily performed. Further, when changing the formation position of the seal member, only the movement path of the nozzle 18 or the mounting flange 4 needs to be changed, and the flexibility of changing the formation position and the shape of the seal member can be greatly improved. Further, since the mounting flange 4 side is previously subjected to cationic electrodeposition coating, the corrosion resistance of the metal fittings can be greatly improved compared to the conventional spray coating method and the durability of the strut mount is greatly improved. Can be achieved.

6 to 11 show seal members 5a to 5f having various cross-sectional shapes which can be adopted in the above-described embodiment, and nozzles 18a to 18f having various cross-sectional shapes for forming them.

These will be described below. In FIG. 6, the nozzle 18a has a flattened sectional shape at the tip opening, and the upward tapered surface 42a is formed with a flat sealing member 5a. is there.

In the structure shown in FIG. 7, the nozzle 18b has a triangular cross-section at the tip end opening thereof, and a sealing member 5b having a triangular cross-section is formed on the upward taper surface 42a.

In FIG. 8, the tip end opening of the nozzle 18c is formed into a triangular shape having a sharper angle than that in FIG. 7, and the concave step portion 44 is formed with a triangular sealing member 5c having a sharp sectional shape. It was done.

In the structure shown in FIG. 9, the nozzle 18d has a rectangular cross section at the tip opening, and a seal member 5d having a rectangular cross section is formed on the upward taper surface 42a.

In the case of FIG. 10, the nozzle 18e has a tip end opening whose cross-sectional shape is substantially semicircular and which has an upwardly tapered surface 42a.
The seal member 5e having a substantially semicircular cross section is formed.

In FIG. 11, the tip end opening of the nozzle 18f has a wavy cross-sectional shape whose apex is biased to one side, and a wavy cross-sectional sealing member 5f projecting upward is formed above the tapered surface 42a. It is something that is done.

The present invention is not limited to the above embodiment, but includes various other modifications. That is, in the above embodiment, the seal members 5, 5a,
Although silicone rubber is used as an elastomer that is a forming material of the ... Is not limited to this, for example, a 1-3 component type silicone type may be used, and for example, a 1 component type is a solventless modified silicone type. , Polysulfide type or polyurethane type, solvent type butyl rubber type, emulsion type acrylic type or butadiene type
A styrene rubber type can be used, and a modified silicone type, a polysulfide type, or a polyurethane type can be used in the two-component type.

In the above embodiment, the first tapered surface is the upward tapered surface 4 which is the upper surface of the tapered wall portion 42 of the mounting flange 4.
2a and the second taper surface is the downward taper surface 62a which is the lower surface of the bending edge 62 of the vehicle body panel 6, but the invention is not limited to this, and conversely, the first taper surface is the lower surface of the tapered wall portion 42, and The two taper surface may be the upper surface of the bent edge 62.

In the above embodiment, the concave step portion 44 is formed by intersecting the upward taper surface 42a and the outer peripheral flange surface 43a. However, as shown by 44a in FIG. 12, for example, the intersection portion is groove-shaped. The sealing member 5g may be provided in the groove-shaped concave step portion 44a.

Further, in the above embodiment, the curing process is performed at room temperature, but the curing process is not limited to this, and the curing may be performed under heating.

Further, in the above embodiment, the nozzle side is fixed and the mounting flange side is movable, and the mounting flange is moved to form an annular seal member at a predetermined position of the mounting flange. Not only
On the contrary, the nozzle side may be movable and the mounting flange side may be fixed, and the nozzle may be moved with respect to the mounting flange to form the seal member at a predetermined position of the mounting flange.

[0044]

As described above, according to the seal portion of the strut mount in the invention described in claim 1, the seal member is provided on the first tapered surface of the mounting flange, and the seal member is attached to the first panel of the vehicle body panel. Since the two taper surfaces are sandwiched so as to be compressed obliquely in the vertical direction, the close contact between the vehicle body panel and the seal member can be reliably achieved. In addition, when the outer peripheral flange surface is joined to the vehicle body panel, the seal member has the second
Since the taper surface pushes and deforms obliquely upward along the first taper surface, it is possible to prevent the sealing member from being caught between the outer peripheral flange surface and the lower surface of the vehicle body panel. Therefore, the outer peripheral flange surface tightened by the bolt and the vehicle body panel can be securely bonded to each other. Accordingly, in combination with the close contact between the joint surfaces to the vehicle body panel, it is possible to reliably block intrusion of water and dust from the outside of the vehicle body at the seal portion where the seal member is arranged. Further, since the sealing member is formed of an elastomer other than natural rubber, it has excellent heat resistance and ozone resistance as compared with the case where it is formed of natural rubber, and the sealing performance is maintained for a long time to improve durability. You can

According to the second aspect of the present invention, since silicone is used as the elastomer, the effect of the first aspect of the invention can be reliably obtained, and in addition, the heat resistance and ozone resistance are particularly excellent and the durability is high. Further, the sealing property can be further improved.

According to the third aspect of the present invention, in the method of forming the seal portion of the strut mount, in the coating step after the preparation step, the nozzle is relatively moved along the portion where the seal member of the mounting flange is formed. While the liquid elastomer having a predetermined viscosity is poured from the nozzle to apply the liquid elastomer, and then the liquid elastomer is cured in the curing step to form a seal portion in which the seal member is fixed at a predetermined position of the mounting flange. be able to.
Therefore, it is possible to eliminate the need for a mold for manufacturing the seal member itself, and it is possible to omit man-hours such as molding and demolding using the mold, and further, the mold can be omitted. It is also possible to omit the number of steps for bonding the sealing member to the mounting flange after molding. Moreover, by increasing the operation accuracy of the relative movement, it is possible to surely form the seal member at a predetermined position and to easily perform the work. Further, when changing the forming position of the seal member, it is only necessary to change the relative movement path of the nozzle or the mounting flange, and the forming position or shape of the seal member is changed as compared with the case of molding each time using a mold. The degree of freedom with respect to can be significantly improved. Further, even if the above-mentioned mounting flange side is previously subjected to cationic electrodeposition coating, the seal portion can be formed without inconvenience, and it is possible to greatly improve the corrosion resistance of the metal fittings as compared with the conventional spray coating method, It is possible to significantly improve the durability of the strut mount.

Further, according to the invention of claim 4, since silicone is used as the elastomer, the effect of the invention of claim 3 can be obtained with certainty.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 4 is a diagram showing an outline of a forming apparatus.

FIG. 5 is an enlarged cross-sectional view showing the relationship between a nozzle and a mounting flange.

FIG. 6 is a cross-sectional view of a seal member having various shapes and a nozzle.

FIG. 7 is a cross-sectional view of a seal member having various shapes and a nozzle.

FIG. 8 is a cross-sectional view of a seal member having various shapes and a nozzle.

FIG. 9 is a sectional view of a seal member and a nozzle having various shapes.

FIG. 10 is a cross-sectional view of a seal member having various shapes and a nozzle.

FIG. 11 is a cross-sectional view of a seal member having various shapes and a nozzle.

FIG. 12 is a cross-sectional view showing another aspect of the recessed step portion.

[Explanation of symbols]

 1 Inner Cylindrical Body 2 Outer Cylindrical Body 3 Elastic Body 4 Mounting Flange 5 Sealing Member 6 Car Body Panel 41a Inner Circumferential Side Flange Surface 42a Upward Tapered Surface (First Tapered Surface) 43a Outer Side Flange Surface 44 Concave Step 61 Opening 62a Downward Tapered surface (second tapered surface)

Claims (4)

[Claims] 1. A strut mount comprises an inner cylindrical body having a cylinder axis oriented in the vertical direction, an outer cylindrical body surrounding the inner cylindrical body, an elastic body connecting the both, and an outer peripheral portion of the outer cylindrical body. And a ring-shaped sealing member provided on one of the upper and lower surfaces of the mounting flange. The vehicle body panel to which the strut mount is mounted has the above-mentioned structure. A strut mount seal in which an annular opening into which the outer cylinder is inserted is formed, and the seal member is sandwiched between the vehicle body panel near the annular opening and one surface of the mounting flange. In the section, on one surface side of the mounting flange, the inner peripheral side flange surface, the outer peripheral side flange surface, and the inner peripheral side flange surface from the outer peripheral edge of the inner peripheral side flange surface to extend obliquely downward to the outer side in the radial direction. Peripheral hula A first taper surface that forms a step over the entire circumference between the outer surface and the outer peripheral side flange surface, and the sealing member is made of an elastomer other than natural rubber over the entire circumference of the first taper surface. It is formed by being attached in a band shape in a cured state, and is radially inwardly arranged in the opening of the vehicle body panel so as to sandwich the sealing member in a diagonally vertical direction so as to face the first tapered surface. A seal portion of a strut mount, wherein a second taper surface extending obliquely upward to the side is formed over the entire circumference. 2. The seal portion of a strut mount according to claim 1, wherein the elastomer is silicone. 3. A strut mount is formed integrally with an inner cylinder, an outer cylinder surrounding the inner cylinder, an elastic body connecting the two, and an outer peripheral portion of the outer cylinder so as to be radially outward. An annular mounting flange that protrudes to the front, and an annular sealing member that is fixed to one surface of this mounting flange, and the sealing portion of the strut mount that is sandwiched between this sealing member and the vehicle body panel. In the forming method, a preparatory step of arranging a nozzle having a predetermined viscosity, into which a liquid elastomer other than natural rubber is poured, close to one surface of the mounting flange, and the nozzle is circumferentially arranged along the one surface. The elastomer is poured out from the nozzle while moving the nozzle and the mounting flange relative to each other so that the poured elastomer is applied along the one surface. Degree and, coated method for forming seal portion of the strut mount, characterized in that elastomer is cured and a curing step of fixing the one surface described above. 4. The method for forming a seal portion of a strut mount according to claim 3, wherein the elastomer is silicone.