JPH10328521A - Watertight plastic casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce assembling cost. SOLUTION: Relating to a watertight plastic casing composed of one part or many parts and having a model provided with a ventilation opening 16 provided in a casing division 11 for exchanging air between inside of the casing and the peripheral environment and a gas permeable diaphragm 17 covering the ventilation opening 16 for checking the entering of water through the ventilation opening 16, the diaphragm 17 is surrounded by a plastic material of the casing division 11 surrounding directly the ventilation opening 16 at the edge part, which is performed by inserting the diaphragm 17 in an injection molding die at the time of plastic injection molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a one-part or multi-part watertight plastic casing of the type described in the preamble of claim 1.

[0002]

2. Description of the Related Art Known casings of the above-mentioned type for electric drives for adjusting cover members for openings in the body of motor vehicles, such as, for example, windshields, slide roofs, etc. (WO 88/88). 09422 specification),
The diaphragm is located in the cup-shaped casing recess,
A through opening is opened at the bottom of the cup-shaped body of the casing recess. In addition, the diaphragm is held by a disk-shaped spring element which is latched in the form of a so-called speednut in the cylindrical wall of the housing recess. A seal configured as an O-ring is inserted between the diaphragm edge and the spring element, and the seal, together with the diaphragm edge, is mounted on a ring-shaped support shoulder preceding the bottom of the cup-shaped body. It is tightened and fixed by the element.

[0003]

SUMMARY OF THE INVENTION The object of the invention is to improve a watertight plastic casing of the type mentioned at the outset.

[0004]

The object is achieved according to the invention by a plastic casing according to the invention as set forth in the characterizing part of claim 1.

[0005]

An advantage of the plastic housing according to the invention is that the diaphragm is already held in the finished housing or housing section and is required for subsequent mounting and in the case of known housings, namely the sealing ring. And that the spring element is omitted. The diaphragm is inserted into the injection mold during plastic injection molding of the casing or casing section and is permanently attached to the plastic material on the edge side by filling with the plastic material, in which case the supply process and the injection of the diaphragm The holding of the diaphragm in the mold can be optimally automated. By an appropriate choice of the support material, the best connection with the plastic material of the casing is obtained.

[0006] Advantageous configurations and improvements of the plastic casing according to claim 1 are possible with the features of the other claims.

In a preferred embodiment of the invention, the housing section is formed by a transmission housing made of plastic. In another embodiment, the plastic housing forms a drive housing, which receives the transmission and the commutator motor of the electric drive for driving the components in the motor vehicle.
In this case, the housing section with the ventilation opening is formed by a cover plate which forms part of the brush holder of the commutator motor, which is mounted watertight on the drive housing.

The advantage of this arrangement is that the integration of the ventilation openings in the brush holder results in a technically advantageous arrangement of the diaphragm, which, in the drive housing, A lot of space is available for placing other components, such as bearings, throttles and conductor plates.

[0009] The ventilation openings are likewise molded together during the plastic injection molding of the brush holder, in which case the diaphragm is advantageously also embedded on the edge side together with the injection molding in the plastics material, whereby the diaphragm is The advantage is that a separate mounting process for the diaphragm is eliminated and the assembly components for securing the diaphragm in the ventilation opening, such as sealing rings and spring elements, are saved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drive shown in FIG. 1 has a watertight drive housing 10 which is a transmission housing 11 made of plastic.
And a motor housing 12 made of, for example, steel, which are flanged to one another with a seal and connected to one another by screws 13. An electric drive motor is arranged in the motor housing 12, which may be a commutator motor and protrudes into the drive housing 11 by a drive shaft.

In the transmission housing 11, a transmission (speed-up or reduction transmission) is accommodated, which is preferably designed as a worm gear transmission and which is a transmission. The output shaft 14 protrudes from the rear surface of the transmission casing 11 (see FIG. 3). A drive pinion 15 is non-rotatably mounted on the protruding end of the drive shaft 14. The drive pinion 15 is used to drive a vehicle component, for example, a vehicle window or a sliding roof, and is connected to the component via a rack, for example.

The drive casing 10 has, in the region of the casing section formed by the transmission casing 11, a ventilation opening 16 which connects the interior of the drive casing 10 to the surrounding environment of the casing. Vent opening 16
The vent opening 16 is covered by a gas-permeable diaphragm 17 to prevent water from splashing into the interior of the casing via the diaphragm 1.
7 is water-tightly sealed to the opening wall of the ventilation opening 16 on the edge side. Although not detailed, such diaphragms are formed from a synthetic diaphragm material that is attached to a rigid synthetic support material.

As shown in the sectional view of FIG.
Since the diaphragm 17 is directly embedded on the edge side in the plastics material of the transmission housing 11 surrounding the ventilation opening 16, the diaphragm edge is simultaneously fixed watertight in the ventilation opening 16. This means that the finished diaphragm is inserted into the injection mold during the plastic injection molding of the transmission casing 11, thereby forming the ventilation opening 16 when filling the plastic material and at the same time the diaphragm is completely plastic material on the edge side. It is done so as to be surrounded by. In this case, by appropriately selecting the support material of the diaphragm 17,
The best connection between the diaphragm 17 and the plastics material of the transmission housing 11 is achieved.

The electric drive for the components to be driven provided in the motor vehicle, shown in FIGS. 3 and 4, comprises:
The electric drive device shown in FIGS. 1 and 2 is such that the electric drive motor housed in the motor casing 12 is configured as a commutator motor and has a brush holder (not shown). That has been fixed in that. The motor casing 12 containing the commutator and the transmission casing 11 containing the transmission are mounted on each other in a watertight manner.
0 is achieved.

As shown in FIG. 4, a notch is provided in the transmission casing 11, and the notch is covered by a plastic cover plate 18 which comes into contact with the motor casing 12 in a watertight manner. Have been. The cover plate 18 is clipped to the transmission casing 11 by a clip 22 with a seal ring interposed therebetween. The cover plate 18 constitutes a component provided with a brush holder (not shown) of the commutator motor housed in the motor casing 12.

In the cover plate 18 of the brush holder, there is a ventilation opening 16 which is watertightly covered by an arrow-permeable diaphragm 17 for air exchange between the interior of the casing and the environment surrounding the casing. ing. As can be seen from the cross-sectional view of FIG. 3, the diaphragm 17 is completely embedded on the edge side in the plastics material of the cover plate 18 in a manner analogous to the transmission housing 11 of FIGS. .

This means that the diaphragm is inserted into the injection mold during the plastic injection molding of the cover plate 18 with the brush holder, whereby the ventilation opening 16 is formed by the incoming plastic material and at the same time the diaphragm is edged. It is performed in such a way that it is completely enclosed on the part side. A plug casing 19 is formed integrally with the cover plate 18 and surrounds the connecting contacts 20, 21 for the commutator brushes at a distance from the commutator motor.

[Brief description of the drawings]

FIG. 1 is a front view of an electric drive device for adjusting an opening cover member in a vehicle body of an automobile.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1;

FIG. 3 is a rear view of another embodiment of the electric drive device similar to FIG. 1;

FIG. 4 is a view of the driving device in the direction of arrow IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drive casing 11 Transmission casing 12 Motor casing 13 Screw 14 Output shaft 15 Drive pinion 16, 17 Vent opening 18 Cover plate 19 Plug casing 20, 21 Connection contact

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Walter Hauszecker Germany Bühlertal Albert-Schönbre Strasse 25 (72) Inventor Friedrich-Wilhelm Dryer Germany Sindzheim Ho Frevenweg 6 (72) Invention Reiner Kurzmann Germany Ahern Schwa Rubenstrasse 17

Claims (5)

[Claims] 1. A one- or multi-part watertight plastic casing, comprising a ventilation opening (11; 18) provided in a casing section (11; 18) for air exchange between the interior of the casing and the surrounding environment of the casing. 16) and a gas permeable diaphragm (1) covering the ventilation opening (16), which prevents water from entering through the ventilation opening (16).
7), characterized in that the diaphragm (17) is directly surrounded on the edge side by the plastics material of the casing section (11; 18) surrounding the ventilation opening (16). Watertight plastic casing. 2. The diaphragm (17) is inserted into the injection mold during plastic injection molding of the housing section (11; 18), whereby the diaphragm is completely surrounded on the edge side by the plastic material. A watertight plastic casing according to claim 1. 3. The diaphragm (17) is formed from a synthetic support material and a diaphragm material provided on said support material, said support material being used during plastic injection molding of the casing section (11; 18). Selected for optimal bonding with plastic materials,
A watertight plastic casing according to claim 2. 4. The casing according to claim 1, wherein the housing is designed as a drive casing (10) for housing a commutator motor having a transmission, and a casing section having a ventilation opening (16) is part of the brush holder of the commutator motor. Formed by a cover plate (18), said cover plate (18) being watertightly driven by the drive casing (10).
A watertight plastic casing according to any one of the preceding claims, mounted on a plastic housing. 5. A drive casing (10) having a transmission casing (11) for accommodating a transmission and a motor casing (12) flanged to the transmission casing for accommodating a commutator motor. A cover plate (18) having a brush holder is held in the transmission casing (11) by inserting a seal ring so as to cover the notch, and is clipped using, for example, a clip (22). A watertight plastic casing according to claim 4.