JP2000091764A - Seal structure of enclosure for electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure for an electric device enclosure which is excellent in workability and sealing property. SOLUTION: A seal chamber where a liquid gasket is stored is formed at a lead wire drawing part 61 of a circuit box comprising a case 17 and a cover 19 which covers it. The seal chamber comprises a gasket reservoir 62 formed at the case 17 and an upper frame 63 which, formed at the cover 19, duplicates with the gasket reservoir 62 when the cover 19 is attached to the case 17. With a seal groove 26 where the liquid gasket is stored provided at the external periphery of the circuit box, an energization wire 7 is drawn outside true the seal chamber so that the energization wire is sealed double for improved water- proof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure of an enclosure for an electric device which accommodates an electric circuit such as a drive control circuit for an electric motor, and more particularly to a seal structure at a lead wire lead-out portion thereof.

[0002]

2. Description of the Related Art Generally, an electric circuit provided with a circuit element such as a semiconductor device or a resistor may cause a short circuit or the like due to moisture or dust. In principle, it is necessary to use it in a box. For example, in a power window and an electric sunroof of a vehicle, an electric circuit for controlling and driving an electric motor (hereinafter, abbreviated as a motor) used as a driving source is hermetically housed in a circuit box including a case and a cover, and is waterproof.・ Attached inside a vehicle door in a dustproof state.

[0003] In this case, the following two schemes have conventionally been exclusively used as a sealing structure for such a circuit box. That is, there are a rubber chromat method as shown in FIG. 6 and a liquid gasket coating method as shown in FIG. Here, in the case of the rubber chromat system shown in FIG. 6, the circuit board is housed in the case 71 or the cover 72, the rubber chromat 73 is fitted between them, and the lead wire 74 is passed therethrough to ensure the waterproofness of the drawer 75. are doing. At this time, the space between the case 71 and the cover 72 is sealed by a liquid gasket 76 such as hot butyl.

In the liquid gasket coating method, a liquid gasket 76 is coated on the side of the case 71 and the cover 72 where the circuit board is stored, and the circuit board 77 is stored therein. Then, a liquid gasket is applied to the opposite surface on the other side, and the two are combined to ensure the waterproofness of the drawer portion 75.

[0005]

However, such a conventional sealing structure has a problem in that, in the case of the rubber chromat system, the cost of the product is high because the price of the rubber chromat itself is high. In addition, the work of fitting the rubber chromat 73 between the case 71 and the cover 72 is required, and there is a problem that the workability is not good. Furthermore, when the lead wire is pulled strongly, there is a possibility that the sealing property between the rubber chromat 73 and the case 71 or the cover 72 cannot be secured as it is, and it is necessary to further apply a sealing material between them. For this reason,
Further man-hours are required for applying the sealing material, which contributes to an increase in cost.

On the other hand, in the case of the liquid gasket coating method, since it is necessary to secure a seal so as to surround the lead wire 74, it is necessary to apply the liquid gasket 76 to both the case 71 and the cover 72 as described above. . For this reason, not only the number of working steps increases, but also the workability is poor because the liquid gasket 76 is applied to the downward surface, and improvement thereof has been desired. In addition, since the lead wire 74 is not sufficiently fixed in the lead portion 75, this portion is weak, and if the lead wire 74 is pulled, the sealing may be incomplete. Further, if the liquid gasket 76 is applied after the lead wires 74 are provided, the sealing on the lower surface side of the lead wires 74 may be insufficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seal structure of an outer enclosure for an electric device which has good workability and excellent sealability.

[0008]

According to the present invention, there is provided a seal structure for an outer enclosure for an electric device, which is a seal structure for a lead wire lead-out portion in an outer enclosure for accommodating an electric device, wherein the lead wire lead-out portion is provided. In addition, a seal chamber for storing a liquid gasket is formed, and a lead wire is drawn out of the envelope through the seal chamber.

Thus, the lead wire can be reliably sealed at the lead wire lead-out portion, and the mechanical strength of the lead-out portion can be improved.

In this case, the outer enclosure has a case and a cover for covering the case, and a seal groove capable of storing the liquid gasket is formed along the outer periphery of at least one of the case and the cover. You may do it. As a result, the lead wire lead-out portion is double-sealed by the seal groove and the seal chamber, and the sealing performance can be further improved.

In this case, the seal chamber includes a lower storage chamber formed in the case, and an upper storage chamber formed in the cover and overlapping the lower storage chamber when the cover is attached to the case. You may do it. in this case,
A liquid gasket injection hole communicating with the lower storage chamber when the cover and the case are coupled may be formed in the upper storage chamber, and the liquid gasket may be injected into the seal chamber from therethrough. Further, the lead wire may be sandwiched between a lower storage chamber and an upper storage chamber.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration of an electric motor unit (hereinafter abbreviated as a motor unit) using a circuit box according to an embodiment of the present invention;
FIG. 2 is an explanatory view showing a state where a cover of the motor unit of FIG. 1 is removed.

A motor unit 1 shown in FIG. 1 is used for driving a power window of an automobile, and a motor (electric motor) 2
And a transmission (transmission unit) 3 and a control unit (control unit) 4. The bracket housing 11 is used by being fixed inside a door of an automobile by a unit fixing portion (hereinafter abbreviated as a fixing portion) 12 provided in the bracket housing 11.

The motor 2 is an ordinary electric motor having a drive shaft (not shown) rotatably disposed in a yoke 13 thereof, and is fixed to the bracket housing 11 by screws 14. The bracket housing 11 is provided with a power supply 6 for supplying power to the motor 2, and the drive shaft rotates by supplying power from the control device 4 to the power supply 6.

The transmission 3 is a device for reducing the rotation of the drive shaft of the motor 2 by a gear train (not shown). This gear train is accommodated in a gear case 15 formed in the bracket housing 11. By fixing the motor 2 to the bracket housing 11, the motor 2
And a transmission 3, and a pinion gear (not shown) provided on a drive shaft of the motor 2 meshes with one end of the gear train. The decelerated rotation is output from an output gear (not shown) attached to the back side of the output shaft 5 in FIG. Further, a bottom cover 16 also serving as a bearing for the output shaft is attached to an upper portion of the gear case 15 in FIG.

The control device 4 houses a control circuit (electric device) 18 for controlling and driving the motor 2 in a case 17.
A cover 19 is mounted thereon, and a circuit box (outer enclosure) is formed by the case 17 and the cover 19.
60 are formed. The control circuit 18 is provided with an energizing wire (lead wire) 7 for supplying electric power to the motor 2. By connecting the coupler 8 attached to the end of the energizing wire 7 to the power supply unit 6, Motor 2
And control circuit 18 are electrically coupled. The control circuit 18 is provided with a direct coupler 20, which is connected to the female coupler 21 on the door side when the motor unit 1 is mounted inside the door.

The control circuit 18 further includes a control circuit 18
And a rotation detection circuit 22 formed separately. The rotation detecting circuit 22 is provided with two surface mount type Hall elements (not shown). Then, the rotation detection circuit 22 is fitted into the opening 23 formed in the case 17 with these Hall elements facing the back side in FIG. In this case, the opening 23 is provided at a position facing a magnet (not shown) attached to the drive shaft of the motor 2, and the Hall element of the rotation detection circuit 22 is disposed to face the magnet of the drive shaft. . Therefore, the rotation angle and the rotation direction of the motor 2 are detected by detecting the pole change of the magnet using these Hall elements. The rotation detecting circuit 22 is fixed by being pressed from above by a pressing rod (not shown) provided on the cover 19 in a state of being engaged with the projection 24 of the opening 23.

In the motor unit 1 shown in FIG. 1, the rotation detecting circuit 22 is also accommodated in the case 17 and is covered by a cover 19. Also, this part and the above-described circuit box 60 part are connected by the connecting part 44. That is, the control device 4 controls the control circuit 18
The circuit box 60 accommodating the rotation detecting circuit 22 is integrated with a case 17 and a cover 19, and the integrated unit is attached to the motor 2 by a bracket 10.

In the control device 4, a seal groove 26 is formed around the case 17, and a hot melt material (liquid gasket) such as hot butyl is poured into this portion, and a cover 19 is attached. Can be In this case, a seal groove (not shown) is also provided in a portion of the cover 19 facing the seal groove 26, and the cover 19 is attached to the case 17 in a sealed state by applying a hot melt material. As a result, the control circuit 18 is housed inside the circuit box 60 in a state where the control circuit 18 is protected from water droplets and dust.

On the other hand, in the motor unit 1, in addition to the seal groove 26, in order to further strengthen the seal of the circuit box 60, a lead-out portion (lead-lead lead-out portion) of the conducting wire 7 is provided.
A seal chamber 27 for sealing 61 is provided.
FIG. 3 is a perspective view showing the configuration of the lead-out portion 61, and FIG. 4 is a cross-sectional view of the lead-out portion 61 along the conducting wire 7.

The seal chamber 27 is formed on one side of the circuit box 60 on the left side in FIGS. 1 and 2 by assembling the case 17 and the cover 19, and the energizing wire 7 is drawn out of the circuit box 60 through this. In this case, a gasket reservoir (lower reservoir) 62 that forms the bottom of the seal chamber 27 is provided on the case 17 side, as shown in FIGS. Also, on the cover 19 side,
Upper frame (upper storage chamber) 63 constituting the upper part of the seal chamber 27
Are provided facing the gasket reservoir 62.

The gasket reservoir 62 is a pan-shaped container having a bottom, and is formed so as to protrude from the outer edge of the case 17.
In addition, an energizing wire 7 is provided on the upper edge of the outer portion and the upper edge of the inner wall portion.
A wire groove 62a having a semicircular cross-section for passing through is formed. The seal groove 26 is provided inside the gasket reservoir 62 as shown in FIG. 3, and a similar wire groove 26a is formed on the upper edge of the side wall.

On the other hand, the upper frame 63 is a frame-shaped container having a cavity (liquid gasket injection hole) 63b vertically penetrated in FIGS. 3 and 4 and is formed to protrude from the outer edge of the cover 19. . The upper frame 63 is a cover 1
When the case 9 is attached to the case 17, the lower surface thereof comes into contact with the upper surface of the gasket reservoir 62, thereby forming a seal chamber 27. A similar wire groove 63a is formed on the lower surface of the upper frame 63 so as to face the wire groove 62a of the gasket reservoir 62.

A hot melt material is poured into the seal chamber 27 having such a structure, separately from the seal groove 26. That is, first, the energizing wire 7 is connected to the wire grooves 62a, 62a.
After passing through 6a, the hot melt material A is poured into the seal groove 26, and the case 17 and the cover 19 are joined. In this case, the hot melt material A is poured only into the seal groove 26 of the case 17, and it is not necessary to apply the hot melt material A to the cover 19 side. Thus, the current-carrying wire 7 is sandwiched between the upper frame 63 and the gasket reservoir 62. Thereafter, the sealing chamber 27 is removed from the cavity 63b of the upper frame 63.
A hot melt material B different from the hot melt material A is poured into the inside. Then, the inside of the seal chamber 27, that is, the inside of the gasket reservoir 62 and the inside of the upper frame 63 are filled with the hot melt material.

FIG. 4 shows a cross section of the seal chamber 27 in this state, whereby the current-carrying wires 7 are double-sealed with the hot melt materials A and B in the circuit box 60. That is, the energizing wire 7 is sealed with the hot melt material A at the seal groove 26, and
Then, it is sealed with the hot melt material B stored there.

FIG. 5 is an explanatory view of the current-carrying wire 7 and the seal chamber 27 in such a state as viewed in cross section along the inner wall surface on the case 17 side. In FIG. 5, the covering of the conducting wire 7 is omitted because the drawing is complicated. As shown in FIG. 5, when the seal chamber 27 is filled with the hot melt material B, the hot melt material A is arranged above the energizing wire 7 on the inner wall surface portion on the case 17 side,
The hot melt material B is in a state outside the hot melt material B. That is, the conducting wire 7 is sealed in such a manner that the hot melt material B always exists on both sides of the hot melt material A.

Thus, in the circuit box 60,
A seal chamber 27 is provided in a lead-out portion 61 of the current-carrying wire 7, and the current-carrying wire 7 is drawn through the seal chamber 27. Therefore, the energizing wire 7 can be reliably sealed by the hot melt material A stored in the seal chamber 27. Further, since the sealing distance can be increased, the waterproof property of the drawer 61 can be further improved.

Further, in addition to the seal groove 26, the seal chamber 2
By providing 7, the seal in the drawer 61 has a double structure, and the waterproofness is further enhanced. In addition, the conducting wire 7
Is held in the seal chamber 7, the strength of the lead-out portion 61 is also ensured, and the seal portion is not easily damaged even if the conducting wire 7 is pulled or twisted.

On the other hand, by providing the seal chamber 27,
The hot melt material is poured into the seal groove 26 in case 1.
One of the side 7 and the side of the cover 19 is sufficient, so that the assembling process is simplified and the workability is improved. Also,
Even if a situation occurs in which the hot melt material does not flow into the lower surface side of the energizing wire 7, the sealing does not become insufficient. Therefore, a process of pouring the hot melt material after distributing the energizing wire 7 to the drawer 61. And the degree of freedom of the process is increased.

The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, an example is shown in which the circuit box according to the present invention is applied to a motor unit for driving a power window. However, the application object is not limited to this, and the present invention is applicable to general circuit boxes. . Also,
In the above-described example, an example is shown in which the hot melt material poured into the seal groove 26 and the seal chamber 27 are different, but these can be the same hot melt material. Further, the object accommodated in the outer enclosure is not limited to an electric circuit, and the present invention is also applicable to a lead wire lead-out portion of a housing of various electric products requiring waterproofness.

[0032]

According to the seal structure of the present invention, since the energizing wire is sealed by providing the seal chamber at the draw-out portion of the energizing wire, the energizing wire can be securely sealed in the seal chamber. Improvement can be achieved. In addition, since the current-carrying wire is held in the seal chamber, the mechanical strength of the drawer can be improved.

Further, if a seal chamber is provided in addition to the seal groove, the seal of the conducting wire in the drawer portion has a double structure, so that the waterproofness can be further enhanced. Further, in this case, it is sufficient to pour the hot melt material into the seal groove on only one of the case and the cover, so that the assembling process can be simplified and the workability can be improved. In addition, by providing the seal chamber, even if a situation occurs in which the hot melt material does not flow around the lower surface side of the energizing wire, the sealing does not become insufficient. A step of pouring a melt material can be adopted, and the degree of freedom of the step can be increased.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an electric motor unit using a circuit box according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state where a cover of the motor unit of FIG. 1 is removed.

FIG. 3 is a perspective view showing a configuration of a drawer of the circuit box.

FIG. 4 is a cross-sectional view taken along a current-carrying wire of a drawer of the circuit box.

FIG. 5 is an explanatory diagram showing a cross section of the seal chamber 27 along a case-side inner wall surface thereof.

FIG. 6 is a perspective view showing a configuration of a conventional circuit box.

FIG. 7 is an explanatory diagram showing a configuration of another conventional circuit box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor unit 2 Electric motor 3 Transmission 4 Control device 5 Output shaft 6 Power supply part 7 Current supply wire 8 Coupler 10 Bracket 11 Bracket housing 12 Unit fixing part 13 Yoke 14 Screw 15 Gear case 16 Bottom cover 17 Case 18 Control circuit (electricity Device) 19 Cover 20 Direct Coupler 21 Female Coupler 22 Rotation Detection Circuit 23 Opening 24 Projection 26 Seal Groove 26a Wire Groove 27 Seal Chamber 44 Connection 60 Circuit Box 61 Leader 62 Gasket Storage (Lower Storage Chamber) 62 Upper Frame (Upper) (Reservoir) 62a Wire groove 63 Upper frame 63a Wire groove 63b Cavity (gasket injection hole) 71 Case 72 Cover 73 Rubber chromat 74 Lead wire 75 Leader 76 Liquid gasket 77 Circuit board A Hot melt material B Hot Melt material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hirohiko Takano 1-268, Hirosawa-cho, Kiryu-shi, Gunma F-term (reference) 4E360 AB02 AB12 AB33 BA03 BC05 BD03 BD05 CA02 CA08 EA03 EA12 EA18 EB04 ED02 ED28 FA02 GA23 GA29 GA53 GB92 GC02 GC08 GC14

Claims (5)

[Claims] 1. A sealing structure for a lead wire lead-out portion in an outer housing for housing an electric device, wherein a seal chamber for storing a liquid gasket is formed in the lead wire lead-out portion, and the seal chamber is formed. A sealing structure for an enclosure for an electric device, wherein the lead wire is drawn out of the enclosure through the intervening member. 2. The sealing structure for an enclosure for an electric device according to claim 1, wherein the enclosure has a case and a cover for covering the case, and the case or the cover includes a cover for covering the case. A seal structure for an enclosure for an electric device, comprising a seal groove along at least one outer periphery of the liquid gasket. 3. The seal structure for an electric device enclosure according to claim 2, wherein the seal chamber is formed in the lower storage chamber formed in the case, and the cover is formed in the cover. A seal structure for an enclosure for an electric device, comprising an upper storage chamber that overlaps with the lower storage chamber when attached. 4. The sealing structure for an enclosure for an electric device according to claim 3, wherein the upper storage chamber has a liquid gasket injection hole that communicates with the lower storage chamber when the cover is attached to the case. A seal structure for an enclosure for an electric device, comprising: 5. The electrical device according to claim 3, wherein the lead wire is sandwiched between the upper storage chamber and the lower storage chamber. Seal structure of outer enclosure.