DE102007022192A1

DE102007022192A1 - Gear casing for electrical drive unit of vehicle windscreen wiper, includes projecting air vent channel with water-shedding diaphragm

Info

Publication number: DE102007022192A1
Application number: DE102007022192A
Authority: DE
Inventors: Hans-Jürgen Kulinna; Wolfgang Ostrowski
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2007-05-11
Filing date: 2007-05-11
Publication date: 2008-11-13

Abstract

The invention relates to a transmission housing for one, which houses a transmission and control electronics for the windscreen wiper motor and having a sealingly arranged gear cover and a venting device with a diaphragm. It solves the problem of designing the gear housing so that, when ensuring a pressure equalization between the housing interior and the housing environment, the penetration of moisture into it is prevented, or at least largely avoided. For this purpose, a venting channel (9) projecting on the gear housing (3) is formed as a venting device, which is closed by the diaphragm (7), wherein the axis (A) is perpendicular or substantially perpendicular to the output shaft (4) of the transmission.

Description

The The invention relates to a transmission housing for an electric drive unit a windscreen wiper, which has a vent and at this a diaphragm having.
to Avoiding a negative pressure in a transmission housing a electric drive unit of a windshield wiper with an in this arranged control electronics for the windscreen wiper motor it is known in the wall of the gear housing with a vent to arrange a diaphragm, which is a pressure equalization between the Environment and the housing interior allows. To protect the diaphragm from mechanical damage this is advantageously associated with a protective cover. The diaphragm However, the ingress of moisture from the ambient air, which does not get completely into the housing interior with a pressure equalization. In addition, moisture, which in the form of water at the vom Diaphragm spaced arranged protective cover for this due to the position of the diaphragm and the protective cover on the gearbox do not drain can affect the function of the diaphragm and this if necessary pollute and also get into the gearbox. penetrated In turn, moisture can cause the failure of the control electronics and with the windshield wiper.
It Object of the invention, a transmission housing for an electric drive unit a windshield wiper according to the preamble of claim 1 so make sure that, while ensuring a pressure equalization between the housing interior and the housing environment prevents the penetration of moisture into this, at least However, as far as possible avoided.
These Task is in a transmission housing according to the preamble of Claim 1 solved by its characterizing features. advantageous Embodiments are listed in the subclaims.
The Invention is that of a transmission housing with a lower housing part and a housing cover an electric drive unit of a windshield wiper, the next a transmission and an electronic control unit for a (wiper) wiper motor houses and on which a vent with one of these closing Diaphragm (diaphragm) is arranged, the vent as a protruding on the housing vent channel is formed, whose axis is perpendicular or substantially perpendicular is arranged to the output shaft of the transmission. This gets that Diaphragm in the nominal position of the drive unit in the vehicle in a position in which water that gets to this, as a result of Gravity rolls off and thus does not penetrate into the transmission housing can. In addition, because of the transmission housing on the above venting channel no moisture or even water in the immediate area of the diaphragm. The diaphragm is thus subject to one Self-cleaning.
Advantageous is the venting channel in a region of the transmission housing arranged, which is protected against mechanical damage, in particular on the housing cover and in paraxial alignment with the housing to the lower part connected pot for the wiper motor and thereby in between this and a plug contact housing for the control electronics formed gap. In this way the diaphragm is protected, and it can be a touch and also mechanical damage the same during assembly or disassembly of the drive unit on the vehicle almost excluded. A separately arranged protective cover for the Diaphragm can be omitted.
Of Furthermore, it is advantageous if the venting channel on a plug-in element is formed, sealing in a housing formed on the receiving opening is used. Thus, the diaphragm is outside the housing on vent channel can be arranged and compatible with the plug-in element to form a unit. Usually consist of the housing and the diaphragm made of plastic, and the latter is at the vent channel welded. happens this on the case, it can cause damage at this and / or the housing / lid seal come. The plug element is expediently with a receptacle for the Diaphragm provided so that this facilitates and process reliable weldable is.
Of the housing cover has housing lower part side a circumferential groove for receiving a lid seal on. In the area the receiving opening is this recessed to receive a plug-in element seal, the Sealing element seals in the radial direction relative to the housing. Advantageous the plug-in element seal is integrally formed on the cover gasket. Further advantageously, this can be in one piece with a two-component injection molding process the housing cover get connected.
The housing cover with the receiving opening and the recess for the plug-in element seal in the groove for the cover gasket can also be used when no venting is required because an electronic control system is not available. In this case, the plug element seal has no opening and closes the receptacle measurement aperture.
The Invention will be explained below using an exemplary embodiment. In the accompanying drawings demonstrate:
1 a drive unit of a windshield wiper,
2 : the gearbox cover of the drive unit, inside and simplified,
3 a gear cover portion with the arranged therein venting device in the manner of an exploded view and
4 : the gearbox section with complete venting device.
In the 1 shown drive unit is of a windshield wiper motor, not shown, in a pot-shaped motor housing 1 is housed, and a transmission housing 2 with a gearbox cover 3 made of plastic, which is an unillustrated worm gear with a worm wheel and an output shaft 4 as well as not shown control electronics for the windscreen wiper motor accommodates. The (gearbox) output shaft 4 is arranged perpendicular to the output shaft of the windshield wiper motor and serves to arrange a windshield wiper or a motion transmission linkage. On the motor housing side side of the gearbox cover 3 is a receiving opening 5 for a plug-in element ( 6 . 2 to 4 ) with a diaphragm ( 7 . 2 to 4 ) formed as a vent above. The axis A of the receiving opening 5 stands perpendicular to the output shaft 4 of the worm gear and is axially parallel to the motor housing 1 arranged. Next to the receiving opening 5 is also a plug contact housing 8th formed for connecting the control electronics to the electrical system, whereby the receiving opening 5 in the between the motor housing 1 and the plug contact housing 8th positioned and through these ( 1 . 8th ) is protected from mechanical contact and damage when handling the drive unit.
2 shows the gearbox cover 3 in a rotated about the axis A 180 ° position and thus inside. The receiving opening 5 is the plug made of plastic 6 assigned and this in turn the diaphragm 7 , a membrane made of Goretex, with the plug element 6 a continuous venting channel 9 and on the gearbox cover 3 opposite side of an approach 10 for receiving the diaphragm 7 having.
The gear cover 3 is housing lower part side with a circumferential groove 11 for receiving a lid seal 12 Mistake. This groove 11 is in the area of the receiving opening 5 deepened and to a recording 14 for a plug-in element seal 13 trained in what 3 can be seen more clearly. The 2 and 3 show the plug element seal 13 , This is with the lid gasket 12 integrally connected and has an opening 15 for passing and sealing the plug-in element 6 on. In 3 is also the training of the approach 10 as a receptacle for the diaphragm 7 more clearly than in 2 to recognize. Inside the neck 10 is a radially formed circumferential abutment shoulder 16 for this ( 7 ) educated.
In 4 the venting device is shown in the assembled state. For assembly, first the lid seal 12 in the groove 11 inserted, whereby also the plug element seal 13 in the recording 14 arrives. Alternatively, the lid seal 12 by a two-component injection molding in one piece with the gear cover 3 connected and therefore already exist. The diaphragm 7 becomes with the plug element 6 welded and as a unit in the receiving opening 5 arranged. This is the plug-in element 6 also in the plug element seal 13 arranged and sealed by these in the radial direction.

1: motor housing
2: gearbox
3: transmission cover
4: output shaft
5: receiving opening
6: plug-in element
7: diaphragm
8th: Male Pins Shell
9: vent channel
10: approach
11: groove
12: cover gasket
13: Plug element sealing
14: admission
15: opening
16: contact shoulder
A: axis
GU: Housing bottom

Claims

Transmission housing for an electric drive unit of a windshield wiper housing a transmission and an electronic control unit for the windscreen wiper motor and having a sealingly arranged housing cover and a venting device with a diaphragm, characterized in that a venting device on the housing ( 3 ) projecting venting channel ( 9 ) formed by the diaphragm ( 7 ) locked with its axis (A) perpendicular or substantially perpendicular to the output shaft ( 4 ) of the transmission is arranged.
Transmission housing according to claim 1, characterized in that the venting channel ( 9 ) in an area of the housing ( 3 ), which is protected against mechanical damage.
Transmission housing according to claim 1, characterized in that the venting channel ( 9 ) on the housing cover ( 3 ) is arranged.
Transmission housing according to claim 2, characterized in that the venting channel ( 9 ) parallel to the axis to a lower housing part (GU) connected cup-shaped motor housing ( 1 ) for the windscreen wiper motor and in between this ( 1 ) and a plug contact housing ( 8th ) is arranged for the control electronics formed intermediate space.
Gear housing according to one or more of the preceding claims, characterized in that the ventilation channel ( 9 ) on a plug-in element ( 6 ) formed in one with this ( 6 ) corresponding receiving opening ( 5 ) on the housing ( 3 ) is inserted sealingly.
Transmission housing according to claim 5, characterized in that the plug element ( 6 ) with the diaphragm ( 7 ) forms a structural unit.
Transmission housing according to claim 5 or 6, characterized in that the plug element ( 6 ) on the housing ( 3 ), an approach ( 10 ) larger inside diameter than that of the venting channel ( 9 ) with an on the inside radially formed abutment shoulder ( 16 ) for the diaphragm ( 7 ) having.
Transmission housing according to claim 5, 6 or 7, characterized in that the plug element ( 6 ) is a plastic part, and that the diaphragm ( 7 ) is welded to this.
Gear box according to one or more of the preceding claims, characterized in that the gear cover ( 3 ) housing lower part side a circumferential groove ( 11 ) for receiving a cover seal ( 12 ) having.
Gear housing according to claim 9, characterized in that the groove ( 11 ) in the region of the receiving opening ( 5 ) and deepening a recording ( 14 ) for a plug-in element seal ( 13 ) trains.
Transmission housing according to claim 10, characterized in that the plug element seal ( 13 ) Part of the lid seal ( 12 ).
Transmission housing according to claim 11, characterized in that the cover seal ( 12 ) in a two-component injection molding with the gear cover ( 3 ) is integrally connected.