DE102010024370A1 - Drive assembly for adjustment of window of motor vehicle, has housing including housing shaft for accommodation of rotor and commutator, and screening plate axially placed in housing shaft and arranged in sections in tubular-form - Google Patents

Abstract

The assembly has a direct current motor (2) arranged in a plastic housing (1), and a transmission (3) arranged downstream of the direct current motor. The direct current motor comprises a stator with stator magnets, a rotor with rotor windings and a commutator with commutator brushes, where the commutator is arranged on a drive shaft. The housing includes a housing shaft for accommodation of the rotor and the commutator. A screening plate is axially placed in the housing shaft and arranged in sections in a tubular-form.

Description

The The invention relates to a drive assembly of a motor vehicle according to the The preamble of claims 1 and 16.

The in question drive assembly is for the motor Adjustment of all possible adjusting elements in a motor vehicle used. In the present case is the motorized adjustment of windows of a motor vehicle in the foreground. This is not limiting to understand. Only by way of example is the motor adjustment of Exterior mirrors, vehicle seats, vehicle locks, Vehicle doors, vehicle doors or the like called.

The known drive assembly ( EP 1 652 283 B1 ), from which the invention proceeds, is used for the motorized adjustment of windows of a motor vehicle.

Of the known drive assembly is a plastic housing assigned, which consists of two half-shells. In the case there is the usual construction of a DC motor and a downstream of the DC motor gearbox. The DC motor has a stature with stator magnets, one on a drive shaft arranged rotor with rotor windings and a likewise on the Drive shaft arranged commutator with associated Kommutatorbürsten on. In the housing is also an electromagnetic Shielding provided the configuration of the housing a non-electrically conductive and therefore non-shielding plastic material Takes into account.

Advantageous in the known drive assembly is the fact that the complete Housing inexpensively manufactured by plastic injection molding can be.

The Joining the comparatively large area Housing shells with simultaneous inclusion of all used components including the shielding However, it is associated with high accuracy requirements during assembly. It must also be ensured that the completely umlau fende Dividing line between the two housing shells sufficient is sealed, which further increases the production cost.

Of the Invention is based on the problem, the known drive assembly to optimize manufacturing technology.

The The above problem is with a drive assembly according to the The preamble of claim 1 by the features of the characterizing one Part of claim 1 solved.

Essential is the consideration that the assembly of engine components over a housing shaft, in particular with regard to the positioning accuracy these components is advantageous. According to the proposal a housing shaft for receiving the rotor and the commutator provided in the also the shielding for Mounting from the outside, relative to the drive shaft axially can be used. The shielding is at least partially designed substantially tubular.

Of the Proposed, structural design of the drive module can be with regard to the manufacture of the housing easy to implement and opens up new possibilities with regard to the dual use of components, in particular the shielding plate, as will be shown.

in the With regard to the manufacture of the housing itself shows the preferred embodiment according to claim 2 an economically interesting variant. Here is the housing shaft having integral part of the housing in one piece otherwise configured with the housing, wherein the housing preferably in plastic injection molding is made.

According to claim 4 is further proposed that the shielding for axial Shielding in particular at both ends in each case a cover plate assigned. This can be a simple way shielding complete encapsulation of the housing shaft to reach.

A particularly simple realization of at least one of the two end plates is the subject of claim 5, which is a cup-shaped embodiment of the shield plate. Such a cup-shaped Shielding can be easily in deep drawing o. Like. Produce.

The further preferred embodiments according to the claims 6 to 8 refer to the closure of the housing shaft on the outside with a frontal housing cover, in addition as a cover plate (claim 7) and / or the inclusion of a bearing section for the drive shaft (Claim 8) can serve. With the realization of a frontal Housing cover can be the sealing of the housing shaft due to the relatively short dividing line between the housing and Housing cover regularly with little effort realize.

In the particularly preferred embodiment according to claim 12, the shielding plate is used twice in an alternative, namely in addition as hold-down for a drive shaft associated rotary bearing. By this is meant that the end plate the rotary bearing, in particular which holds the outer ring of the rotary bearing, axially in its bearing seat.

According to the Claims 13 and 14 is for receiving the rotary roller bearing a receiving cage provided over which the Rotary roller bearing is supported on the housing. According to the proposal, the receiving cage additionally used in the sense of an axial shielding. This dual use in turn leads to a particularly cost-effective Construction.

The basic structure of a recording cage above can be the German Patent Application 10 2009 019 726.5 which is attributed to the Applicant and the content of which is hereby incorporated by reference in its entirety.

To another doctrine, which also has its own significance comes, the above problem is in a drive assembly according to the preamble of claim 16 by the features of the characterizing part of Claim 16 solved.

Essential Here is the above-mentioned consideration, the shielding additionally as a bearing retainer for the drive shaft to use associated rotary bearings. On the equipment of the housing with a housing seschacht in the above Meaning it does not matter. Incidentally, but allowed on All statements referenced to the former teaching become.

in the The invention will be described below with reference to a mere exemplary embodiments illustrative drawing explained in more detail. In the Drawing shows

1 a proposed drive assembly in a schematic side view,

2 the drive assembly according to 1 in a sectional side view along the section line AA,

3 the shielding plate of the drive assembly according to 2 in the remodeled state and

4 a proposed drive assembly in a further embodiment in a view according to 2 ,

The in the drawing exemplified, according to the proposal Drive assemblies are the scope of application of power windows Act. This is not meant to be limiting. In particular, the invention is applicable to all in the introductory part of Description mentioned areas advantageously applicable.

The drive modules shown are each with a housing 1 made of plastic and one in the housing 1 arranged DC motor 2 fitted. Also in the case 1 arranged is a the DC motor 2 downstream transmission 3 , The gear 3 is as worm gear with worm 3a and only schematically illustrated worm wheel 3b designed. The worm wheel 3b is with a drive pinion 4 connected, which meshes with a corresponding drive element of the window lifter, not shown.

The DC motor 2 has a stator in the usual way 5 with stator magnet 5a . 5b , one on a drive shaft 6 arranged rotor 7 with rotor windings 7a and one also on the drive shaft 6 arranged commutator 8th with associated commutator brushes 9 on. The commutator brushes 9 are in a brush holder 10 integrated, which in addition to the connection to a higher te te power supply can also have electronic components. In the case 1 is a shielding plate 11 for the electromagnetic shielding of the commutator 8th and the rotor 7 arranged. Depending on the EMC requirements, the shielding can 11 also just one of the components commutator 8th and rotor 7 be assigned.

To a good relative to the drive shaft 6 Radial shielding encloses the substantially tubular portion of the shielding plate 11 in any case, the components to be shielded, here the commutator 8th and the rotor 7 ,

The shielding plate 11 is preferably designed as a thin sheet. In principle, all types of conductive sheets can be used here, but in particular cost-effective sheet steel. As advantageous for the realization of the electromagnetic shielding 11 Also, the use of tinplate, so tinned steel sheet has shown.

It is essential now that the housing 1 a housing shaft 12 for receiving the rotor 7 and the commutator 8th having, wherein the housing shaft 12 designed so that the shielding 11 for mounting from the outside relative to the drive shaft 6 axially in the housing shaft 12 can be used. Accordingly, the housing shaft 12 here on the drive shaft 6 aligned. The wall of the housing shaft 12 is shown in the context of the purely schematic drawing extremely thin and will be designed stronger in practice.

The shielding plate 11 is proposed according to at least partially substantially tubular design and can thus particularly easily, in particular form-fitting, in the housing shaft 12 insert and position there.

From the illustration in 1 it becomes clear that the case 1 the drive assembly has two main housing sections, namely a housing shaft 12 having housing section 1a and one of the transmission components 3a . 3b having housing section 1b , Here and preferably, it is such that the housing shaft 12 having housing section 1a integral with the housing 1 otherwise configured. This can be easily realized in FITS preferred embodiment that the housing 1 produced by plastic injection molding. In this case, the housing shaft 12 having constituent 1a to the housing 1 Incidentally be injected. Here, different production methods are conceivable.

In the latter, the one-piece variants understood that at least one of the two housing sections 1a . 1b , Preferably both housing sections 1a . 1b , preferably itself is configured in one piece or are.

Depending on the design boundary conditions, the substantially tubular portion of the shielding plate 11 be configured in cross-section substantially round, oval, rectangular or square. Other embodiments are conceivable. For positionally accurate insertion of the shielding plate 11 for mounting is advantageously provided that the shield 11 positive fit with the housing shaft 12 engaged.

The substantially tubular configuration of the shielding plate 11 ensures a good radial shielding of the drive components in question. For the shield in the axial direction additional measures must be taken. The terms "radial" and "axial" are present always on the axis of the drive shaft 6 based.

For axial shielding is now proposed that the shielding 11 preferably at both ends 11a . 11b one end plate each 13 . 14 assigned. With the two trim plates 13 . 14 , both here from the drive shaft 6 are penetrated, the housing shaft can be 12 shield EMC-tight overall.

The at least one end plate 13 . 14 Can be integral with the shielding 11 be configured, as in the embodiment of the geared end plate 13 shown. It can also be provided as a separate component. This is the case for the getriebeferne end plate 14 the case.

A particularly simple implementation, in particular of the drive close end plate 13 shows 3 , There is the shielding 11 pot-shaped staltet, the bottom of the cup-shaped shielding 11 a graduation sheet 13 in the above sense, here the gear-close end plate 13 , which provides an opening for the drive shaft 6 having.

It can be the representations in the 2 and 4 Take that out of the housing shaft 12 here and preferably outwardly with a frontal housing cover 15 is closed. The housing cover 15 is designed essentially flat. He can with the case 1 Incidentally, be connected waterproof by means of ultrasonic welding or the like. It is also conceivable to provide a clamp fastening over a sealing ring here.

Of particular advantage in the illustrated embodiments is the fact that the housing cover 15 having an electrically conductive component, so that the housing cover 15 in any case a part of the gear-less cover plate 14 provides. In principle, it can also be provided here that the housing cover 15 itself at least partially designed to be electrically conductive.

In the illustrated and insofar preferred embodiments of the housing cover 15 with an electrically conductive insert 16 equipped with the function of the transmission-independent end plate 14 takes over. The insert is preferably designed as a sheet metal, which is preferably made of the same material as the shielding plate 11 is.

The deposit 16 is at the in 2 illustrated embodiment in the assembled state with the shielding 11 in circumferentially electrically conductive connection. It is preferable that the insert 16 not on impact on the shield 11 adjacent, but with the shield 11 slightly overlapped. This overlap is not shown in the drawing.

It is interesting in the illustrated embodiments, the fact that the housing cover 15 In addition, the function of receiving a bearing section 17 for the drive shaft 6 due. This leads above all to an increase in the compactness of the drive assembly.

For a particularly low-vibration operation is in the near-drive area of the housing shaft 12 preferably a rotary roller bearing 18 for the drive shaft 6 intended. In a particularly preferred embodiment, it is provided here that the shielding 11 , here the gear-close cover plate 13 , with the rotary bearing 18 or with a rotary bearing 18 assigned component, here with the bearing outer ring 18a , in circulating electrical contact. at the rotation roller bearing 18 assigned component in the above sense, it may, for example, a bearing shell or a still to be explained recording cage o. The like. Act. The above, circumferential electrical contact is again EMC-tight, so gap-free, formed. Here is the rotary bearing 18 a portion of the axial shield for the housing shaft 12 ,

In a particularly preferred embodiment, the shield plate 11 for the realization of the electrical contact point with the rotary roller bearing 18 an axially projecting, substantially annular Kontaktausformung 20 on. This can be a synopsis of 2 and 3 remove.

Here and preferably it is in addition so that the gear-close end plate 13 from the contact point with the bearing outer ring 18a starting radially inward up to the drive shaft 6 extends. Thus, according to the proposal, a double axial shield is realized in the area close to the drive.

Interesting in the illustrated embodiments is further the fact that the shielding 11 in addition to the shielding another function, namely a bearing retainer for the rotary bearing 18 ,

In the embodiments shown in the drawing, the shield presses 11 the rotary rolling bearing 18 , here the bearing outer ring 18a of the rotary roller bearing 18 , axially in the bearing seat 19 , In this case, the power flow of the holding force on the electrical contact point between the bearing outer ring runs 18a and the shielding plate 11 , At the in 2 illustrated embodiment, it is such that the power flow of the holding force also over the housing shaft 12 associated housing cover 15 runs. The housing cover 15 pushes the rotary roller bearing 18 over the shielding plate 11 in the camp seat 19 ,

The shielding plate 11 can be advantageous in the above manner as a bearing retainer for the rotary roller bearing 18 deploy. If only small axial holding forces are required, here is a certain flexibility, which is associated in particular with a thin shielding, advantageous to bring about a certain vibration damping.

The above-mentioned double function of the shielding plate 11 can basically also for the end plates 13 . 14 , especially for the gear-close end plate 13 Find application. All the above explanations apply accordingly.

In a non-illustrated, further preferred embodiment, it is such that a receiving cage for receiving the rotary roller bearing 18 is provided, wherein the rotary roller bearing 18 over the receiving cage on the housing 1 supported. The basic structure of such a receiving cage can be the German Patent Application 10 2009 019 726.5 to which reference has already been made above. Such a receiving cage provides a sort of housing 1 anchored bearing seat 19 for the rotary bearing 18 ready.

It is essential that the receiving cage at least a portion of the axial shield, in particular at least a portion of the drive close end plate 13 , provides.

It would be conceivable, for example, that the receiving cage on the rotor side has a circumferential collar, which then the gear near end plate 13 forms. The shielding plate 11 is preferably in electrically conductive connection with the end plate thus formed 13 , so that again an EMC-tight shielding is guaranteed.

An assembly advantageous arrangement results according to a further preferred embodiment in that the receiving cage together with the shield 11 forms a preassemblable unit. This allows these two components in particular together with the rotary roller bearing 18 with a single, substantially axial mounting movement in the housing shaft 12 deploy.

In both illustrated and insofar preferred embodiments, the stator 5 , in particular the stator magnet 5a . 5b , a conclusion element 21 , here and preferably a pole tube 21 , assigned. The pole tube 21 Here, as needed, to the dimensions of the stator magnets 5a . 5b be adjusted. Preferably, the pole tube 21 only slightly longer, in particular between about 1.0 mm and 5.0 mm longer than the stator magnets 5a . 5b educated.

The above adjustment of the pole tube 21 leads to a reduction in length, to a corresponding material savings and thus to reduced weight and reduced costs. At the pole tube 21 it can be a cost-effectively manufactured, rolled steel tube.

Basically, the pole tube 21 within the tubular portion of the shielding plate 11 be arranged. This is at the in 2 realized embodiment illustrated. Given the fact that the pole tube 21 itself comes to a shielding, learns the rotor 7 here a dop pelt shielding.

At the in 4 illustrated and so far preferred embodiment closes the return element 21 So the pole tube 21 , seen in the axial direction of the shielding 11 at. The shielding plate 11 and the pole tube 21 are therefore arranged one behind the other in the axial direction. In order to be able to achieve a sufficient shielding on the cover side, it is here and preferably such that it attaches to the housing cover 15 a ring 22 connects, in particular, in one piece with the insert 16 connected is. This ring 22 is in electrically conductive contact with the pole tube 21 which in turn is in electrically conductive contact with the shielding plate 11 stands. The pole tube 21 As a result, it forms part of the electromagnetic shielding.

The proposed solution can be used advantageously for motors with a small overall length, in which the stator magnets 5a . 5b have a small axial length. Such stator magnets 5a . 5b are regularly formed as rare-earth magnets. Especially when using stator magnets 5a . 5b with a small axial length, the advantage of the resulting, correspondingly short pole tube 21 clear.

For the sake of completeness, in the case of all the variants indicated above, it must be pointed out that all the components adjacent to the electromagnetic shield are in electrically conductive connection with one another. The goal is yes, as comprehensive as possible EMC-tight shielding of the housing shaft 12 to achieve.

It should also be noted that additionally or alternatively, an axial electromagnetic shielding by a suitable embodiment of the brush holder 10 can be realized. This shielding could be specific to the brush firing at the commutator 8th resulting, electromagnetic interference radiation are designed.

Finally, it should be pointed out that the drive assembly can also have a device for speed detection. This is preferably between the brush holder 10 and the rotary antifriction bearing 18 arranged. It is conceivable in this case that at least a part of the shielding 11 not quite up to the rotary bearing 18 is enough, which is justifiable in certain applications with regard to the shielding effect.

According to another teaching, which has independent significance, is a drive assembly of a motor vehicle with a housing 1 made of plastic and one in the housing 1 arranged DC motor 2 and also in the case 1 arranged, the DC motor 2 downstream transmission 3 claimed. The DC motor 2 is with a stator 5 with stator magnet 5a . 5b , one on a drive shaft 6 arranged rotor 7 with rotor windings 7a and one also on the drive shaft 6 arranged commutator 8th with associated commutator brushes 9 fitted.

Essential to this further teaching is that in the housing 1 a shielding plate 11 for the electromagnetic shielding of the commutator 8th and / or the rotor 7 is used that a rotary bearing 18 for the drive shaft 6 is provided and that the shielding 11 a bearing retainer for the rotary bearing 18 provides.

So essential is the double use of the shielding 11 , which has already been mentioned above. On the realization of a housing shaft 12 in the above sense it does not necessarily matter. For the rest, however, reference may be made in full to the above statements.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1652283 B1 [0003]
• - DE 102009019726 [0017, 0051]

Claims (17)

Drive assembly of a motor vehicle with a housing ( 1 ) made of plastic and one in the housing ( 1 ) arranged DC motor ( 2 ) as well as in the housing ( 1 ), the DC motor ( 2 ) downstream transmission ( 3 ), wherein the DC motor ( 2 ) a stator ( 5 ) with stator magnets ( 5a . 5b ), one on a drive shaft ( 6 ) arranged rotor ( 7 ) with rotor windings ( 7a ) and one on the drive shaft ( 6 ) arranged commutator ( 8th ) with associated commutator brushes ( 9 ), wherein in the housing ( 1 ) a shielding plate ( 11 ) for the electromagnetic shielding in particular of the commutator ( 8th ) and / or the rotor ( 7 ), characterized in that the housing ( 1 ) a housing shaft ( 12 ) for receiving the rotor ( 7 ) and the commutator ( 8th ), that the shielding plate ( 11 ) for mounting from the outside axially into the housing shaft ( 12 ) and that the shielding ( 11 ) is at least partially configured substantially tubular. Drive assembly according to claim 1, characterized in that the housing shaft ( 12 ) housing section ( 1a ) integral with the housing ( 1 ) is otherwise configured, preferably that the housing ( 1 ) is produced by plastic injection molding, more preferably that of the housing shaft ( 12 ) component ( 1a ) of the housing ( 1 ) to the housing ( 1 ) is sprayed on the rest. Drive assembly according to claim 1 or 2, characterized in that the substantially tubular portion of the shielding plate ( 11 ) is configured in cross-section substantially round, oval, rectangular or square. Drive assembly according to one of the preceding claims, characterized in that the shielding plate ( 11 ) for axial shielding at its proximal end ( 11a ) and / or at its transmission far end ( 11b ) each one end plate ( 13 . 14 ) assigned. Drive assembly according to claim 4, characterized in that the shielding ( 11 ) cup-shaped and that the bottom of the cup-shaped shielding ( 11 ) a graduation sheet ( 13 . 14 ), in particular the gear-close end plate ( 13 ). Drive assembly according to one of the preceding claims, characterized in that the housing shaft ( 12 ) to the outside with a front-side housing cover ( 15 ) is closed. Drive assembly according to claim 4 and optionally according to claim 5 or 6, characterized in that the housing cover ( 15 ) is at least partially electrically conductive or has an electrically conductive component and that the housing cover ( 15 ) at least part of an end sheet ( 14 ). Drive assembly according to one of the preceding claims, characterized in that the housing cover ( 15 ) a storage section ( 17 ) for the drive shaft ( 6 ) having. Drive assembly according to one of the preceding claims, characterized in that in the area close to the drive of the housing shaft ( 12 ) a rotary rolling bearing ( 18 ) for the drive shaft ( 6 ) is provided, preferably that the shielding ( 11 ) and / or the gear-near end plate ( 13 ) with the rotary antifriction bearing ( 18 ) or with a rotary antifriction bearing ( 18 ) associated component, in particular with the bearing outer ring ( 18a ), is in circumferential electrical contact, preferably, that the circulating electrical contact is largely free of gaps. Drive assembly according to claim 9, characterized in that the shielding ( 11 ) and / or the gear-near end plate ( 13 ) in the region of the electrical contact point an axially projecting, substantially annular Kontaktausformung ( 20 ) having. Drive assembly according to claim 9 or 10, characterized in that the drive close end plate ( 13 ) from the contact point with the bearing outer ring ( 18a ) o. The like. Starting radially inward to the drive shaft ( 6 ). Drive assembly according to claim 9 and optionally according to claim 10 or 11, characterized in that the shielding plate ( 11 ) and / or the gear-near end plate ( 13 ) a bearing retainer for the rotary bearing ( 18 ), preferably, that the power flow of the holding force via the electrical contact point with the bearing outer ring ( 18a ) o. The like. Runs. Drive assembly according to one of claims 9 to 12, characterized in that a receiving cage for receiving the rotary roller bearing ( 18 ) is provided that the rotary roller bearing ( 18 ) over the receiving cage on the housing ( 1 ) and that the receiving cage at least a portion of the axial shield, in particular of the drive close end plate ( 13 ). Drive assembly according to one of the preceding claims, characterized in that the receiving cage together with the shielding ( 11 ) a preassemblable unit bil the. Drive assembly according to one of the preceding claims, characterized in that the stator ( 5 ), in particular the stator magnet ( 5a . 5b ), a conclusion element ( 21 ), in particular a pole tube ( 21 ), preferably, that the inference element ( 21 ) within the tubular portion of the shielding plate ( 11 ), or that the inference element ( 21 ) seen in the axial direction of the shielding ( 11 ). Drive assembly of a motor vehicle with a housing ( 1 ) made of plastic and one in the housing ( 1 ) arranged DC motor ( 2 ) as well as in the housing ( 1 ), the DC motor ( 2 ) downstream transmission ( 3 ), wherein the DC motor ( 2 ) a stator ( 5 ) with stator magnets ( 5a . 5b ), one on a drive shaft ( 6 ) arranged rotor ( 7 ) with rotor windings ( 7a ) and one on the drive shaft ( 6 ) arranged commutator ( 8th ) with associated commutator brushes ( 9 ), characterized in that in the housing ( 1 ) a shielding plate ( 11 ) for the electromagnetic shielding of the commutator ( 8th ) and / or the rotor ( 7 ) is inserted, that a rotary rolling bearing ( 18 ) for the drive shaft ( 6 ) is provided and that the shielding ( 11 ) a bearing retainer for the rotary bearing ( 18 ). Drive assembly according to claim 16, characterized by the features of the characterizing part of one or more of claims 1 to 15.