JP3704182B2 - Seal structure of door mirror electric storage unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal structure for a door mirror electric storage unit.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an electric storage unit for an automobile door mirror is generally configured by covering a casing that houses a motor and a speed reduction mechanism from above. Conventionally, the mating surface of the casing and the cover has mostly adopted a simple seal structure in which both are simply fitted, and this structure provides the necessary waterproof effect for car washing at home. However, with the recent spread of coin car wash (high pressure car wash), water intrusion into the unit has become a problem.
[0003]
On the other hand, when sealing the casing and the cover, not only the simple type of sealing structure as described above but also a sealing structure using a sealing material as shown in FIGS. FIG. 4 shows an example using an O-ring. The casing 11 and the cover 12 are formed in a cylindrical shape, screwed at several locations on the circumference (not shown), and abut on the surface 13. In the O-ring 14, a portion indicated by 15 is set as a compression allowance. FIG. 5 shows an example using a sealing material having an L-shaped cross section, and FIG. 6 shows an example using a sealing material having a rectangular cross section. The casings 21 and 31 and the covers 22 and 32 are in contact with each other at the surfaces 23 and 33, and the seal materials 24 and 34 are set at portions indicated by 25 and 35 as compression allowances.
[0004]
[Problems to be solved by the invention]
However, even when the sealing materials 14, 24, and 34 are used in this way, the waterproof performance against the high-pressure car wash is insufficient. This is because the cover 12, 22, 32 is a plastic molded product, and sufficient dimensional accuracy cannot be obtained, so that a portion where the set compression allowance cannot be secured is generated. Further, increasing the compression allowance with these conventional structures means that even if the covers 12, 22, and 32 are screwed to the casings 11, 21, and 31 at several locations, the covers 12, 22, and 32 are caused by the reaction force of compression. Since this leads to deformation, the implementation was difficult.
[0005]
Therefore, a technical problem to be solved by the present invention is to provide a seal structure that can provide a sufficient waterproof performance even for a high-pressure car wash in an electric storage unit using a cover made of a plastic molded product.
[Means for solving the problems and actions / effects]
In order to solve the above technical problem, the seal structure of the door mirror electric storage unit according to the present invention is configured as follows. That is, the casing has, at its upper end, a flange extending radially outward and a peripheral wall extending upward from the inner peripheral edge of the flange. Further, the sealing material is cross-sectioned from a cylindrical portion that fits to the outer peripheral surface of the peripheral wall of the casing and has a lower height than the peripheral wall of the casing, and an annular base portion that projects radially outward from the lower end of the cylindrical portion. It is formed in an L shape. The cover is formed at an outer peripheral wall having an inner peripheral surface fitted to the outer peripheral surface of the flange of the casing, a contact surface in contact with the front end surface of the peripheral wall of the casing, and a position where the front end portion of the cylindrical portion of the sealing material is compressed. And a compression piece having a wedge-shaped cross section that bites into the annular base portion of the sealing material. And the space which absorbs the deformation | transformation accompanying compression of a sealing material is formed between the casing and the cover.
[0006]
In the above configuration, first, since the outer peripheral surface of the flange of the casing and the inner peripheral surface of the outer peripheral wall of the cover are fitted, water droplets can be prevented from rising between the fitting surfaces due to capillary action. Also, by allowing the compression piece to bite into the sealing material, the biting allowance can be made larger than the compression allowance in the sealing structure that compresses the sealing material on the surface, and the cylindrical portion of the sealing material Since the upper end of the sealing member is also compressed so that a sufficient compression allowance is taken for the entire sealing material, the intrusion of high-pressure water can be reliably prevented.
[0007]
In the above configuration, the lower surface of the flange of the casing and the lower surface of the outer peripheral wall of the cover are formed on the same plane in a state where the front end surface of the peripheral wall of the casing is in contact with the contact surface of the cover. Is preferred. If comprised in this way, since both lower surfaces will align when a cover is assembled | attached to a casing, it can confirm easily that the sealing material has fully compressed if it sees that.
[0008]
Moreover, in the said structure, it is preferable to form the inner peripheral wall located adjacent to the inner peripheral surface of a peripheral wall in a cover. With this configuration, even when the casing and the cover are formed of different materials, even if the amount of deformation due to temperature changes is different, the cover compression surface is displaced from the tip of the cylindrical portion of the sealing material, or the cover compression piece is It can prevent shifting from the annular base part of the sealing material.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the seal structure of the electric storage unit according to the embodiment of the present invention will be described with reference to FIG. 1 which is a cross-sectional view of a main part in an assembled state of the unit, FIG. This will be described in detail with reference to FIG.
[0010]
In the figure, 1 is a casing, 2 is a cover, and 3 is a sealing material. The casing 1 is a rectangular tube having a substantially rectangular cross section (not shown), and has a flange 4 and a peripheral wall 5 extending upward from the inner peripheral edge of the flange 4 at its upper end. In this example, the front end surface 5a of the peripheral wall 5 and the upper surface 4a of the flange 4 are perpendicular to the outer peripheral surface 5b of the peripheral wall 5 and the outer peripheral surface 4b of the flange 4, respectively. It is possible to have a slightly inclined surface.
[0011]
The sealing material 3 is formed in a L-shaped cross section using polyvinyl chloride, ethylene propylene diene monomer or the like having a slightly lower hardness than a conventional sealing material, and is a cylinder fitted to the outer peripheral surface 5 b of the peripheral wall 5 of the casing 1. A cylindrical portion 3a and an annular base portion 3b projecting radially outward from the lower end of the cylindrical portion 3a and in contact with the upper surface 4a of the flange 4. The height of the cylindrical portion 3 a is slightly lower than the height of the peripheral wall 5 of the casing 1, and the outer peripheral surface of the annular base portion 3 b is formed with a diameter that is substantially aligned with the outer peripheral surface 4 b of the flange 4 of the casing 1.
[0012]
The cover 2 is adjacent to the outer peripheral wall 6 having an inner peripheral surface 6a that is press-fitted into the outer peripheral surface 4b of the flange 4 of the casing 1 and the inner peripheral side of the peripheral wall 5 of the casing 1 with a slight gap therebetween. And a peripheral wall 7. Further, between the inner peripheral wall 7 and the outer peripheral wall 6, a contact surface 8 that comes into contact with the front end surface 5 a of the peripheral wall 5 of the casing 1, a compression surface 9 that compresses the front end portion of the cylindrical portion 3 a of the sealing material 3, and a seal A compression piece 10 having a wedge-shaped cross section is formed in stages so as to bite into the annular base 3 b of the material 3.
[0013]
The compression surface 9 is set so that the compression margin is approximately the same as that of the prior art because the compression surface 9 is compressed by pressing the tip of the cylindrical portion 3a of the sealing material 3 with the surface. Further, since the compression piece 10 is configured to compress the sealing material 3 by biting into the base portion 3b, even if the biting allowance is larger than the normal compression allowance as shown in the drawing, the cover 2 is not deformed. In addition, the fact that the cover 2 is not deformed also contributes to the fact that the hardness of the sealing material 3 is slightly lower than that of the prior art.
[0014]
S is a space for releasing the deformed portion when the seal material 3 is deformed by being compressed. Further, the lower surface 4c of the flange 4 of the casing 1 and the lower surface 6b of the outer peripheral wall 6 of the cover 2 are formed so as to be positioned on the same plane when the front end surface 5a of the peripheral wall 5 and the contact surface 8 of the cover 2 are in contact. Has been.
[0015]
In the sealing structure having the above-described configuration, the outer peripheral surface 4b of the flange 4 and the inner peripheral surface 6a of the outer peripheral wall 6 are press-fitted and fitted, so that water droplets from the lower surface 4c, 6b of the flange 4 and the outer peripheral wall 6 are capillary tubes. It is possible to prevent a rise between the fitting surfaces due to the phenomenon. On the other hand, by allowing the compression piece 10 to bite into the seal material 3, the bite allowance is made larger than the compression allowance in the conventional seal structure, and the upper end of the cylindrical portion 3a of the seal material 3 is also compressed as a whole. Since it is sufficiently compressed, high pressure water can be reliably prevented from entering.
[0016]
In the above configuration, when the front end surface 5a of the peripheral wall 5 of the casing 1 and the contact surface 8 of the cover 2 are in contact, the lower surface 4c of the flange 4 and the lower surface 6b of the outer peripheral wall 6 are aligned on the same surface. Therefore, when the cover 2 is assembled to the casing 1, it can be confirmed that the sealing material 3 can be sufficiently compressed only by looking at the fact that the lower surfaces 4c and 6b are aligned.
[0017]
Further, since the cover 2 is provided with the inner peripheral wall 7 in the above-described configuration, since the casing 1 and the cover 2 are formed of different materials, the compression surface 9 is the cylinder of the sealing material 3 even when the deformation amounts of the two differ due to temperature changes. It can prevent that it shifts | deviates from the front-end | tip of the shape part 3a, or the compression piece 10 slip | deviates from the cyclic | annular base part 3b of the sealing material 3, and can prevent that sealing performance deteriorates.
[0018]
In the above configuration, the height of the cylindrical portion 3a of the sealing material 3 is larger than the width of the annular base portion 3b so as to have a vertically long shape. is there.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing a seal structure of an electric storage unit according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the main part of the casing.
FIG. 3 is a cross-sectional view of a main part of a cover.
FIG. 4 is a cross-sectional view of a main part showing a seal structure of an electric storage unit according to a conventional example.
FIG. 5 is a cross-sectional view of a main part showing a seal structure of an electric storage unit according to another conventional example. FIG. 6 is a cross-sectional view of a main part showing a seal structure of an electric storage unit according to another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Casing 2 Cover 3 Sealing material 3a Cylindrical part 3b Annular base part 4 Flange 4a Upper surface 4b Outer peripheral surface 4c Lower surface 5 Peripheral wall 5a Tip surface 6 Outer peripheral wall 6a Inner peripheral surface 6b Lower surface 7 Inner peripheral wall 8 Contact surface 9 Compression surface 10 Compression piece

Claims (2)

Between the casing (1) having the upper end opened and housing the door mirror electric storage mechanism therein, and the cover (2) attached to the upper end of the casing (1) and closing the opening, the sealing material (3) In the seal structure of the door mirror electric storage unit
The casing (1) has, at its upper end, a flange (4) extending radially outward, and a peripheral wall (5) extending upward from the inner peripheral edge of the flange (4),
The sealing material (3) is fitted to the outer peripheral surface (5b) of the peripheral wall (5) of the casing (1) and has a cylindrical portion (3a lower than the peripheral wall (5) of the casing (1). And an annular base portion (3b) projecting radially outward from the lower end of the cylindrical portion (3a), and having an L-shaped cross section,
The cover (2) includes an outer peripheral wall (6) having an inner peripheral surface (6a) fitted to the outer peripheral surface (4b) of the flange (4) of the casing (1), and a peripheral wall of the casing (1) ( The contact surface (8) in contact with the tip surface (5a) of 5), the compression surface (9) formed at a position for compressing the tip of the cylindrical portion (3a) of the seal material (3), and the seal material ( A compression piece (10) having a wedge-shaped cross section that bites into the annular base (3b) of 3),
Furthermore, between the casing (1) and the cover (2), a space (S) that absorbs deformation due to compression of the sealing material (3) is formed ,
In a state where the contact surface (8) and are in contact with the front end surface of the peripheral wall (5) of the casing (1) (5a) and a cover (2), a lower surface (4c) of the flange (4) of the casing (1) A seal structure for a door mirror electric storage unit, characterized in that the lower surface (6b ) of the outer peripheral wall (6) of the cover (2) is positioned on the same plane . Between the casing (1) having the upper end opened and housing the door mirror electric storage mechanism therein, and the cover (2) attached to the upper end of the casing (1) and closing the opening, the sealing material (3) In the seal structure of the door mirror electric storage unit
The casing (1) has, at its upper end, a flange (4) extending radially outward, and a peripheral wall (5) extending upward from the inner peripheral edge of the flange (4),
The sealing material (3) is fitted to the outer peripheral surface (5b) of the peripheral wall (5) of the casing (1) and has a cylindrical portion (3a lower than the peripheral wall (5) of the casing (1). And an annular base portion (3b) projecting radially outward from the lower end of the cylindrical portion (3a), and having an L-shaped cross section,
The cover (2) includes an outer peripheral wall (6) having an inner peripheral surface (6a) fitted to the outer peripheral surface (4b) of the flange (4) of the casing (1), and a peripheral wall of the casing (1) ( The contact surface (8) in contact with the tip surface (5a) of 5), the compression surface (9) formed at a position for compressing the tip of the cylindrical portion (3a) of the seal material (3), and the seal material ( A compression piece (10) having a wedge-shaped cross section that bites into the annular base (3b) of 3),
Furthermore, between the casing (1) and the cover (2), a space (S) that absorbs deformation due to compression of the sealing material (3) is formed ,
The cover (2) further sealing structure of the door mirror electric storage unit, characterized in that it comprises a peripheral wall (7) Among located adjacent to the inner peripheral surface of the peripheral wall (5).

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