JP2003163473A - Seal structure of housing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten assembling manhour while surely sealing up a gap between each electric wire penetrated into a housing and the housing. <P>SOLUTION: Lip parts 113 are formed on each inserting groove hole 112 and the lip parts 113 are depressed by a 1st housing 101 to close the hole 112. Since the pressure of a contact surface on the tip side of the opposed lip part 113 is increased, the opposed lip part 113 can be surely stuck to as compared with a case that the tip side of the opposed lip part 113 is simply brought into contact. Since the lip parts 113 are deformed, the lip parts 113 can be stuck to electric wiring 121. Since the inserting groove holes 12 are formed, a gap between the electric wiring 121 and the housing 100 can be surely sealed up while shortening the assembling manhour. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for sealing a gap between a housing and a rod-shaped penetrating member penetrating inside and outside a housing, and an electric component housed in the housing and connected to the electric component. It is effective when applied to a waterproof structure of a vehicle electric component including a penetrating member such as electric wiring penetrating the inside and outside of the housing.

[0002]

[Prior Art and Problems to be Solved by the Invention] FIG.
Shows a waterproof structure of a general vehicle electric component. Specifically, the electric component 120 is housed in the housing 100 having excellent water resistance, and
A rubber grommet 110 is attached to the hole for drawing out the electric wiring formed in the wiring, and as shown in FIG. 9, a wiring having a diameter smaller than the diameter of the electric wiring is used as a hole for passing the electric wiring 121 through the grommet 110. The hole 111 is provided.

By the way, in this method, the electrical wiring 121
Since the grommet 100 and the grommet 100 can be surely brought into close contact with each other, it is possible to reliably prevent water from entering the housing along the surface of the electric wiring 100.
Since the diameter of the wiring hole 111 is smaller than the diameter of the electric wiring,
It is difficult to insert the electric wiring 121 into the wiring hole 111, and it is difficult to reduce the number of assembling steps.

On the other hand, as shown in FIG. 10, an insertion slot 112 may be provided to make the wiring hole 111 have an open cross-sectional shape, but this means can reduce the number of assembling steps. However, since water enters through the insertion slot 112, the waterproof property is deteriorated.

In view of the above points, an object of the present invention is to reduce the number of assembling steps while surely sealing a gap between a housing and a penetrating member such as an electric wiring penetrating the inside and outside of the housing.

[0006]

In order to achieve the above-mentioned object, the present invention provides a rod-shaped penetrating member (121) penetrating the inside and outside of the housing (100) and the housing (100). An elastic deformation having a sealing structure for sealing a gap between the housing (100) and the housing (100), and having a communication hole (111) and an insertion groove hole (112) having an open cross-sectional shape A grommet (110) made of a possible material is used for housing (10
0), the penetrating member (121) has a communication hole (11).
It is attached to 1) and penetrates inside and outside the housing (100),
The insertion slot (112) is closed by a lip portion (113) made of an elastically deformable material, and the lip portion (113) is pressed and deformed to insert the insertion slot (112). It is characterized in that it is blocked.

As a result, the insertion slot (112) can be closed while the contact surface pressure of the lip portion (113) is increased. Therefore, by providing the insertion slot (112), the number of assembling steps can be reduced. Slot for insertion (11
2) can be effectively sealed to reliably seal the gap between the penetrating member 121 and the housing 100.

The lip portion (113) may be integrally formed with the grommet (110) as in the second aspect of the invention.

According to the third aspect of the present invention, if the lip portion (113) is pressed by the fixing force for fixing the grommet (110) to the housing (100), the grommet (110) is housed. Since the lip portion (113) can be pressed simultaneously with the assembling to the (100), the number of assembling steps can be further reduced.

When pressing the lip portion (113) with a fixing force for fixing the grommet (110) to the housing (100) as in the invention of claim 4, the invention of claim 4 is used. So that the grommet (11
0) and the lip portion (113) are press-fitted into the mounting hole (104) formed in the housing (100), and the mounting hole (104) is tapered so that the opening area decreases toward the forward side in the press-fitting direction. You may form in a shape.

Further, as in the invention described in claim 5, two members (101, 1) constituting the housing (100) are provided.
02) is assembled and fixed by a fixing force.
3) may be pressed.

Incidentally, the reference numerals in the parentheses of the above means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment)
The present invention is applied to a waterproof structure of electric parts for a vehicle such as an electric valve for adjusting the flow of engine cooling water.
1A is a schematic view showing a prevention structure according to the present embodiment, FIG. 1B is a view taken in the direction of arrow A in FIG.
(C) is sectional drawing of the grommet 110 simple substance which concerns on this embodiment.

The electric component 120 is one of the electric components constituting an electric valve, and the electric component 120 is housed in a housing 100 made of a material having excellent water resistance. The housing 100 is configured by assembling and fixing the first housing 101 and the second housing 102 with bolts (not shown) that form a fastening means, and is joined to the first and second housings 101 and 102. The surface is provided with packing (not shown) that seals the gap between the joint surfaces.

In this embodiment, the first and second housings 101 and 102 are made of resin and the packing is made of rubber.

The grommet 110 has a housing 100.
A communication hole 111 for communicating the inside and the outside, and an insertion slot 112 having an open cross-sectional shape of the communication hole 111 are formed. Of the insertion slot 112, on the outer wall side of the grommet 110,
Lip portion 1 protruding so as to close the insertion slot 112
13 are provided. Here, the grommet 110 and the lip portion 113 are integrally formed of rubber, which is a kind of material that has excellent water resistance and is elastically deformable.

The electrical wiring 121, which is a rod-shaped penetrating member connected to the electrical component 120, is mounted in the communication hole 111 as shown in FIG.
It penetrates inside and outside. At this time, the lip portion 113 is in contact with the first housing 101 as shown in FIG.
It is pressed by the fixing force for fixing to 02 and elastically deformed, and the lip portions 113 facing each other are in close contact with each other to close the insertion slot 112 and in close contact with the electric wiring 121.

Next, the procedure for assembling the waterproof structure of the electric component for a vehicle according to this embodiment will be described.

First, as shown in FIG. 2A, the electric wiring 121 is fitted into the communication hole 111 through the insertion slot 112,
Next, as shown in FIG. 2B, the first and second housings 1
The grommet 110 is fixed to the housing 100 by sandwiching the grommet 110 with 01 and 102.

As a result, the lip portion 113 is pressed by the first housing 101 at the same time when the first housing 101 is assembled and fixed to the second housing 102,
3A elastically deforms from the state shown in FIG. 3A to the state shown in FIG. That is, the two opposite lip portions 113 are
Due to the assembling force when assembling the first housing 101, that is, the fixing force for fixing the first and second housings 101 and 102, the first housing 101 and the first and second housings 101 and 102 are pressed against each other.

Next, the function and effect of this embodiment will be described.

In this embodiment, since the lip portion 113 is deformed to close the insertion slot 112, the contact surface pressure on the tip end side of the facing lip portion 113 becomes large, so that the tip end side of the facing lip portion 113 is increased. The lip portions 113 facing each other can be surely brought into close contact with each other as compared with the case where they are simply brought into contact with each other. Similarly, since the lip portion 113 is deformed, the lip portion 113 can be brought into close contact with the electric wiring 121.

Therefore, by providing the insertion slot 112, the number of assembling steps can be reduced, and the electric wiring 12 can be reduced.
The gap between 1 and the housing 100 can be reliably sealed.

Incidentally, when the insertion slot 112 is simply cut, the insertion slot 112 is apparently closed, but at the cut portion, the surface pressure sufficient to obtain a waterproof effect is not provided. Does not occur.

(Second Embodiment) In the first embodiment, the packing provided between the grommet 110 and the first and second housings 101 and 102 is a separate body, but in the present embodiment,
As shown in FIG. 4, packing 103 and grommet 110
And are integrated.

(Third Embodiment) In the first and second embodiments,
Grommet 1 by the first and second housings 101 and 102
10 is sandwiched between the grommet 110 and the housing 100.
In the present embodiment, as shown in FIG. 5, the grommet 110 integrally formed with the lip portion 113 is press-fitted into the mounting hole 104 formed in the housing 100, and the mounting hole 104 is fixed in the press-fitting direction. The more you go to the forward side,
It is formed in a tapered shape so that the opening area is reduced.

The "advancing side in the press-fitting direction" in this embodiment is a force directed from the outside to the inside of the housing 100.

As a result, the grommet 110 is attached to the mounting hole 1
As it is more press-fitted into 04, a fixing force for squeezing the grommet 110 acts on the grommet 110, so that the lip portion 113 is deformed by this fixing force and the insertion slot 112 is inserted.
And closes the electrical wiring 121.

(Fourth Embodiment) In the first to third embodiments,
In a state before the grommet 110 is attached to the housing 100, as shown in FIG. 6, the two lip parts 113 facing each other are projected so that the projecting directions of the two lip parts 113 intersect with the first housing 101 side. The protrusion length L of the groove is larger than the groove width W of the insertion slot 112,
When the lip portion 113 is pressed, the tip ends of the lip portions 113 facing each other are brought into close contact with each other, but in the present embodiment, as shown in FIG. 7, the first housing 101 projects toward the lip portion 113 side. By providing the protruding portion 101a and pressing the lip portion 113 so as to bend it by the protruding portion 101a, the tip side of the lip portion 113 and the protruding portion 10a.
1a is pressed to close the insertion slot 112.

(Other Embodiments) In the above-described embodiment, the lip portion 113 is formed integrally with the grommet 110, but the present embodiment is not limited to this, and the lip portion 113 and the grommet 110 are formed. It may be a separate body.

Further, in the above-described embodiment, the lip portion 11
3 is pressed by the fixing force for fixing the grommet 110 to the housing 100, but the present invention is not limited to this, and the lip part is tied together with the lip part 113 with a binding band, for example. You may press 113.

In the above embodiment, the insertion slot 112 is closed by the two lip portions 113 facing each other, but the present invention is not limited to this. For example, one lip portion 113 is used. The slot 112 for insertion may be closed by. In this case, the lip portion 113 is in pressure contact with the inner wall of the insertion slot 112.

Further, in the third embodiment, the mounting hole 104
Is formed so that the opening area is reduced toward the forward side in the press-fitting direction, but conversely, the grommet 110 is tapered such that the cross-sectional area is reduced toward the forward side in the press-fitting direction. You may form.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a seal structure according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a procedure of assembling the seal structure according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a function and effect of the seal structure according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a seal structure according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a seal structure according to a third embodiment of the present invention.

FIG. 6 is an explanatory diagram for comparison to explain the structure of a seal structure according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram illustrating a seal structure according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining a seal structure according to a conventional technique.

FIG. 9 is a perspective view of a grommet according to a conventional technique.

FIG. 10 is a perspective view of a grommet according to a conventional technique.

[Explanation of symbols]

100 ... Housing, 101 ... First housing, 102
... 2nd housing, 110 ... Grommet, 111 ... Communication hole, 112 ... Insertion slot, 113 ... Lip part 113.

Claims (5)

[Claims] 1. A seal structure for sealing a gap between a rod-shaped penetrating member (121) penetrating the inside and outside of the housing (100) and the housing (100), and a communication hole (for communicating the inside and outside of the housing (100)). 1
11) and a grommet (110) made of an elastically deformable material, having an insertion slot (112) having an open cross-sectional shape of the communication hole (111), mounted on the housing (100), The penetrating member (121) is installed in the communication hole (111) and penetrates the inside and outside of the housing (100), and the insertion slot (112) is formed by a lip portion (113) made of an elastically deformable material. The housing seal structure is characterized in that the lip portion (113) is closed, and further, the lip portion (113) closes the insertion slot (112) in a deformed state by being pressed. 2. The seal structure for a housing according to claim 1, wherein the lip portion (113) is integrally formed with the grommet (110). 3. The housing seal structure according to claim 2, wherein the lip portion (113) is pressed by a fixing force for fixing the grommet (110) to the housing (100). . 4. The grommet (110) and the lip portion (113) are press-fitted into a mounting hole (104) formed in the housing (100), and the mounting hole (104) is press-fitted. 4. The housing seal structure according to claim 3, wherein the seal structure is formed in a taper shape such that the opening area is reduced toward the advancing side in the direction. 5. The housing (100) is constructed by assembling at least two members (101, 102), and the lip portion (113) further comprises the two members (101, 102). The housing seal structure according to claim 3, wherein the seal structure is pressed by a fixing force for assembling and fixing.