WO2019110627A1

WO2019110627A1 - Load-bearing assembly with attachment zone for damping an acoustic excitation

Info

Publication number: WO2019110627A1
Application number: PCT/EP2018/083562
Authority: WO
Inventors: Joachim Müller; Jannik Menzel; Martin Schlechtriemen; Stefan Walther
Original assignee: Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg
Priority date: 2017-12-08
Filing date: 2018-12-05
Publication date: 2019-06-13
Also published as: DE102017222297A1

Abstract

The invention relates to a load-bearing assembly for a vehicle power window, having • - a load-bearing part (1), defining a load-bearing surface (10) on which an attachment zone (11) is provided, and • - a motor drive unit (2) for the vehicle power window which is secured to the attachment zone (11) of the load-bearing part (1) at at least one mounting point (P1, P2, P3). Furthermore, in the attachment zone (11), at least one attachment area (110) is formed on which the at least one mounting point (P1, P2, P3) for the drive unit (2) is provided and which has a wall thickness (d2) that is smaller than a wall thickness (d1) on the sections of the load-bearing area (10) adjacent to the attachment area (110).

Description

Carrier assembly with mounting area for attenuating an acoustic

stimulation

description

The invention relates to a support assembly for a vehicle window lifter.

Such a carrier assembly comprises a support member defining a support surface on which an attachment portion is provided, and a motor drive unit for the vehicle window lifter, which is fixed to the attachment region at at least one attachment point. The carrier component can be designed, for example, as a carrier plate with functional components of the vehicle window lifter arranged on the carrier surface as well as additional functional components in the form of a loudspeaker or other functional components for a vehicle door. The carrier assembly may further form a door module for installation in a vehicle door.

The motor drive unit, which is fixed to the carrier component, serves for driving the motor-operated vehicle window lifter, for example the motorized adjustment of at least one driver connected to a window pane to be adjusted along guide rails of the window lifter. Incidentally, these guide rails can likewise be fastened to the carrier component or integrated therewith. During operation of the motor drive unit, a drive movement of drive and / or transmission elements of the drive unit or components coupled thereto leads to vibrations which are introduced into the carrier component at the at least one attachment point and likewise excite the carrier component to oscillate. As a result of the structure-borne sound excitation of the drive unit in the door module this is excited to vibrate. These surface vibrations can then be emitted as airborne sound. The airborne sound radiation can then be perceived inside and outside the vehicle. This structural behavior often leads to acoustic ripple frequencies in the range of 20 Hz to 150 Hz. Likewise, these vibrations can be perceived as vibrations. When the excitation frequency of the drive unit coincides with a self-resonant frequency of a vehicle assembly (eg, the door trim panel, vehicle door, etc.), annoying airborne noise and vibration in the vehicle are usually generated.

As already shown, for example, in WO 201 1/095415 A1, it is therefore fundamentally desirable to prevent or at least reduce the generation of sound and sound propagation in such carrier assemblies such that they are no longer perceived by a vehicle occupant in the vehicle as disturbing. In the WO 2011/095415 A1, it is proposed in this context to form the mounting region, on which a motor drive unit is fixed, for damping an acoustic excitation of the support surface. For this purpose, an attachment region of WO 2011/095415 A1 has decoupling means formed by one or more slots and at least one webs, by means of which a section of an attachment region carrying the motor drive unit is acoustically decoupled from adjacent sections of the support surface. By providing the one or more slots on the support member, the support member is acoustically interrupted whereby the portion carrying the motor drive unit is acoustically separated from the remaining portions of the support member.

However, there is still a need for a support assembly for a vehicle window lifter, in which alternative or complementary measures for damping acoustic stimuli are provided.

Against this background, a support assembly with the features of claim 1 is proposed. Hereinafter, a support assembly for a vehicle window lifter is provided, in which at the carrier member side mounting region for the motor drive unit at least one mounting surface is formed on which the at least one attachment point for the drive unit is provided and which has a wall thickness which is opposite to a wall thickness of the mounting surface Sections of the support surface is reduced.

The basic idea of the proposed solution is therefore to provide a reduced wall thickness and a concomitant reduced rigidity (in each case in comparison to adjacent sections of the carrier surface of the carrier component) in the region of the attachment surface on which an attachment point for the motor drive unit is provided. Thus, a thin-film surface for acoustic damping is provided on the carrier surface, specifically in the attachment region, where the at least one attachment point is also located, and thus a connection is provided between the motor drive unit and the carrier component.

In this case, the wall thickness of the attachment surface can be reduced by a defined amount compared to a (mean) wall thickness of the carrier surface. Thus, the wall thickness of the attachment surface is smaller than the (average) wall thickness of adjacent portions of the support surface, in particular smaller than the (average) wall thickness of the support surface itself. Thus, the support member can be flat and e.g. be formed as a support plate and be formed away from a mounting surface of the mounting region with a largely constant wall thickness. For example, a wall thickness of the planar support component, in particular for use in a door module, depending on the base material, in the range of 0.5 to 1, 8 mm. A wall thickness of a mounting surface of the attachment region is thus reduced with respect to such a wall thickness and formed correspondingly thin-walled.

For the reduced rigidity at the region where the motor drive unit is fixed to the carrier component via the at least one attachment point, it can be provided that the wall thickness of the attachment surface is reduced by at least 10% compared to the wall thickness of adjacent sections of the carrier surface.

Alternatively or additionally, the wall thickness of the attachment surface can be reduced by a maximum of 70% compared with the wall thickness of adjacent sections of the support surface. In one embodiment variant, the wall thickness of the attachment surface is reduced by at least 12% and at most by 45% in relation to the wall thickness of the adjacent section of the support surface.

In one embodiment, the wall thickness of the mounting surface is in the range of 0.7 mm to 1, 3 mm, in particular in the range of 0.8 mm to 1, 2 mm. Alternatively or additionally, an average wall thickness of the support surface can be at least 1.4 mm. On the basis of the abovementioned percentage values and dimensions, for example, a variant embodiment is provided in which the (average) wall thickness of the support surface is in the range of 1.4 mm or more and the wall thickness of the attachment surface on which the at least one attachment point for the drive unit is provided In comparison, by at least 10% to a maximum of 50% reduced in a range of 0.7 mm to 1, 2 mm.

In one embodiment, the mounting surface of reduced wall thickness is formed on the support surface. The carrier surface is thus not provided on a component mounted separately on the carrier component. Rather, in this embodiment, the mounting surface reduced wall thickness integral part of the support surface and integrally formed thereon. The attachment surface is thus made of the same material as the support surface, for example of a plastic material.

At the attachment region, a transition region may be provided which connects the attachment surface to an adjacent portion of the support surface. At the transition region, the support member may for example have a wall thickness which, although smaller than the (average) wall thickness of the support surface, but is greater than the wall thickness of the thin-walled or thin-walled mounting surface.

In principle, the transition region may be formed with less rigidity than an adjacent portion of the support surface with which the transition region joins the attachment region. Accordingly, the transition region can be set up and provided for additional damping of an acoustic excitation and / or for (additional) decoupling of the attachment surface from the rest of the carrier surface. For example, the transition region is formed in cross-section with a wave geometry. In cross section thus the transition region appears corrugated at least in one section. Such a corrugated design of the transition region brings with it an additional, damping elasticity or stiffness change on the support surface, so that an acoustic decoupling of the attachment surface on which the motor drive unit is fixed to at least one of possibly a plurality of attachment points can be achieved from the rest of the support surface ,

In principle, the drive unit can also be fixed to a plurality of (at least two) spatially separated attachment points on the support surface. In one embodiment, the plurality, possibly all attachment points over which the drive unit is fixed to the support member may be provided on the mounting surface of reduced wall thickness. It is thus formed on the support member with the mounting surface of reduced wall thickness, a continuous, area extending portion on which the motor drive unit is fixed. In a refinement based thereon, all fastening points of the drive unit, which are provided for fixing them to the carrier component, are provided on the mounting surface of reduced wall thickness (and thus on the mounting surface of reduced rigidity).

In an alternative embodiment, at least two spatially separated attachment sections, each with an attachment surface, may be formed on the attachment region, wherein at least one attachment point for the drive unit is provided on each attachment surface of an attachment section.

In a further development of a carrier module, in which an attachment region identifies at least two spatially separate attachment sections, each with an attachment surface, the attachment surfaces can have mutually different wall thicknesses. The spatially separated and thus optionally sequentially formed on the support surface mounting portions are thus not formed in this variant with identical, reduced wall thicknesses, but have different wall thicknesses. Thus, although each attachment surface of the different attachment portions then has a reduced wall thickness compared to portions of the support surface adjacent to the attachment region, however, the wall thickness is different for at least two attachment surfaces belonging to different attachment portions. For example, the wall thicknesses of two attachment sections differ by at least 0.1 mm to 2 mm. By each attachment surface is assigned at least one attachment point for the motor drive unit, a local and thus in particular attachment point specific setting of decoupling and damping factors can be provided on the different thickness attachment surfaces reduced wall thickness. At each of a plurality of fastening points for the drive unit, wall thicknesses that are possibly reduced to different extents may thus be provided for a different degree of damping, depending on the attachment point. For example, thus for a fastening point of the drive unit, for example in the form of a screw-on, a decoupling and damping function can be varied and adjusted accordingly.

An attachment surface of the attachment region may, for example, have a circular contour. In the case of a plurality of attachment surfaces spatially mutually separate attachment portions, the attachment surfaces may accordingly each have a circular contour. However, a comparable or even identical contour different mounting surfaces of the mounting region is not mandatory. Incidentally, a transition region, which is designed for the connection of the attachment surface with an adjacent portion of the support surface, for example, circular in shape around an attachment surface be configured.

In one embodiment, a damping mass for (additional) damping of an acoustic excitation of the support surface is provided on the mounting surface of reduced wall thickness. The absorber mass can in this case be attached to the attachment surface as a separate component, in particular injection-molded. In one embodiment, the absorber mass is provided on a second side of the attachment surface opposite to a first side on which the drive unit is disposed. Tilgermasse and drive unit are thus provided on different sides of the mounting surface.

Alternatively or additionally, at least one additional attachment region with a mounting surface of reduced wall thickness can be provided on the support surface, wherein an absorber mass for (additional) damping an acoustic excitation of the support surface is provided on the attachment surface of the at least one additional attachment region. In this case, for example, a functional component arranged on the carrier component in addition to the motor drive unit can be fixed to the additional attachment area. The attachment region formed for damping an acoustic excitation of the carrier surface with the at least one attachment surface of reduced wall thickness for fixing the drive unit is in a variant embodiment for acoustic decoupling and / or damping of vibrations excited by the operation of the motor drive unit in the range from 20 Hz to 10 kHz provided and formed on the support surface.

As already mentioned, the proposed carrier assembly may for example form a door module in which different functional components of a vehicle door are arranged and preassembled on the carrier component, such as further functional components of the vehicle window lifter, a speaker, a door lock, and / or a side airbag.

Furthermore, by means of the proposed solution, a window lifter for producing a window pane of a vehicle can be provided, in which a carrier assembly with a carrier component, on which a motor drive unit is fixed for adjusting the window pane, has at least one attachment surface of reduced wall thickness for fixing the drive unit.

The attached figures illustrate by way of example possible embodiments of the proposed solution.

Hereby show:

Figure 1 shows a detail and in side view of a support assembly with an attachment region, on the mounting surface of reduced wall thickness an electric motor drive unit is set via a plurality of attachment points;

Figure 2 shows an alternative embodiment in accordance with the figure 1 matching view, in which a mounting region has a plurality of spatially separated mounting surfaces reduced wall thickness for each attachment point of the electric motor drive unit; Figures 3A-3B in different views, a support member of a support assembly of Figure 1 or 2 with an additional mounting surface reduced wall thickness, on which a damping mass is arranged.

FIG. 1 shows a side view of a detail of a carrier module for a door module, which comprises a planar carrier element 1 designed as a carrier plate. The carrier component 1, which is usually made of plastic, defines a carrier surface 10 on which functional components for a vehicle door are fixed. The support surface

10 defines a drive attachment region 11, to which a motor drive unit 2 for a vehicle window lifter is to be determined as intended. By means of the motor drive unit 2 in this case, for example, a flexible traction means, such as a cable, can be driven to displace at least one driver connected to a window pane and thereby raise and lower the window pane on the vehicle door.

During operation of the motor drive unit 2, which in the present case comprises an electric motor and a gear device, vibrations can be introduced into the carrier component 1 at attachment points P1, P2 and P3 at which the drive unit 2 is fixed to the carrier component 1. An attachment point P1, P2 or P3 may, for example, be a screw-on point for the fixation of the drive unit 2. Vibrations generated during operation of the drive unit 2 are thus introduced into the planar carrier component 1 at the attachment points P1, P2 and P3, which are amplified when excited in the region of the natural resonant frequencies of a vehicle door assembly on which the carrier component 1 is provided and disturbing in the vehicle interior can be perceived. The attachment region 1 1 is formed against this background for damping an acoustic excitation of the support surface 10.

The attachment area 11 defines a, e.g. Membrane-like configured, mounting surface 1 10, where the drive unit 2 is fixed via its attachment points P1, P2 and P3 and which has a relation to the support surface 10 reduced wall thickness. For example, a wall thickness of the support surface 10 is in the range of 1.4 mm. A wall thickness of the attachment surface 110 of the drive attachment portion

1 1 is in contrast in the range of 0.8 mm to 1, 2 mm. The wall thickness of the attachment surface 110 is thus reduced by at least 10%, but at most by 70%, compared to a (mean) wall thickness of the carrier surface 10. These Thickness reduction brings (with still sufficient stability) with a defined reduction in rigidity in that area in which the drive unit 2 is fixed to the support member 1. As a result, vibrations generated by the operation of the drive unit 2 are damped.

In a circumferentially extending around the mounting surface 1 10 transition region 1 11 of the drive mounting surface 11, the wall thickness compared to the wall thickness of the support surface 10 is also reduced, but to a lesser extent. For (additional) acoustic decoupling of the fixed to the mounting surface 110 drive unit 2, the circumferentially circumferential transition region 1 11 may also be designed in cross-section with a wavy geometry and therefore wavy. Such a geometry is illustrated by way of example in the cross-sectional representation of FIG. 3B, but in connection with a (identically designed) transition region 121 of an additional attachment region 12, which will be explained in more detail below.

First, however, reference is made to a further possible embodiment of the proposed solution according to the figure 2. In this embodiment variant, the drive attachment region 1 1 defined on the carrier surface 10 of the planar carrier component 1 for the electromotive drive 2 does not have a single larger-area attachment surface 110 of reduced wall thickness for the drive unit 2. In the variant shown in Figure 2, the mounting portion 11 has a plurality of spatially separated mounting portions 1 1 A, 1 1 B and 1 1 C. Each of these - in the present example in each case circular-shaped - attachment portions 11 A, 11 B and 11 C has its own mounting surface 110 of reduced wall thickness in the range of 0.8 mm to 1, 2 mm. , The wall thickness of the respective mounting surface 1 10 is thus reduced by 70% to 10% compared to a (mean) wall thickness of the support surface 10. In this case, each of these mounting surfaces 110 is connected via an annular peripheral transition area 11 1 with adjacent portions of the support surface 10, via which an additional acoustic damping is achieved. At each mounting surface 1 10 of the different attachment portions 1 1 A, 11 B and 11 C exactly one attachment point P1, P2 or P3 is provided for the determination of the drive unit 2.

In a possible development, the wall thicknesses of at least two mounting surfaces 1 10 different mounting portions 1 1 A, 1 1 B and 1 1 C, for example by at least 0.1 mm to 2 mm. Due to the different wall thicknesses of the attachment surfaces 110, to which only one of the attachment points P1, P2 and P3 is provided, a decoupling and damping factor for the acoustic damping of the drive unit can be set and specified locally and thus in particular attachment point specifically. Depending on the attachment point P1, P2 or P3, a different degree of damping is thus set via different greatly reduced wall thicknesses.

In a carrier component 1 of a carrier assembly for a vehicle window lifter shown in detail in FIGS. 1 and 2, a drive attachment region 11 is provided with at least one thin-walled attachment surface 110 for fixing the drive unit 2. The respective attachment surface 110 is always integrally formed with the support surface 10 and thus from the same (plastic) material as the support surface 10. Each mounting surface 110 thus represents a locally and thus sequentially formed region of reduced wall thickness of the planar support component 1. The associated local formation of thin-wall regions on the support component 1 is comparatively inexpensive to produce and in particular not associated with additional material costs.

According to the illustration of FIGS. 3A and 3B, a damping mass M for (additional) acoustic damping can additionally be provided on the carrier component 1. Such an absorber mass M may for example be injection-molded onto an attachment surface 110, for example on a second side of the carrier component 1, which is opposite to a first side of the carrier component 1 on which the drive unit 2 is arranged. For example, the drive unit 2 may be arranged with the electric motor on a dry space side of the support member 1, while the Tigermasse M is sprayed onto a dry space side of the support member 1 to an attachment surface 1 10.

About the additional provided absorber mass M can be a vibration frequency and thus a resonator function of a mounting surface 110, in particular a membrane-like mounting surface 1 10 selectively influence and thus set. However, this is not only advantageous in the case of a mounting surface 110 on which at least one fastening point P1, P2 or P3 is provided for the drive unit 2. Rather, a further attachment surface 120 may additionally be formed on the carrier component 1 as part of an additional attachment region 12. Geometry and design of this additional attachment area 12 In principle, this does not differ from the geometry and configuration of a mounting region 11 in an embodiment variant according to FIGS. 1 and 2. Accordingly, a peripheral region 121 surrounding the mounting surface 120 of the additional mounting region can also be configured with a likewise reduced wall thickness and, in particular, corrugated this is shown in particular in the sectional view of Figure 3B for the section line BB of Figure 3A.

Conversely, the design of the transition region 121 as well as the mounting surface 120 in terms of their geometry and a reduced wall thickness d2 corresponds to an embodiment of a transition region 111 and a mounting surface 1 10 in a variant of Figure 1 or 2. Further, from Figure 3B is an example of a wall thickness d2 of the attachment region 120 (1 10) illustrates significantly greater (average) wall thickness d1 of the support surface 10 away from the drive attachment region 11 and away from the additional attachment region 12.

LIST OF REFERENCE NUMBERS

1 carrier component

10 carrier surface

1 1 drive attachment area

1 10 mounting surface

1 1 1 transition area

1 1 A, 1 1 B, 1 1 C Mounting section 12 Mounting area 120 Mounting surface 121 Transition area 2 Drive unit d 1, d2 Wall thickness / wall thickness M (absorber) mass

P1, P2, P3 attachment point

Claims

claims

1. Carrier assembly for a vehicle window lifter, with

- A support member (1) defining a support surface (10) on which an attachment region (11) is provided, and

- A motor drive unit (2) for the vehicle window lifter, which at the attachment region (11) of the support member (1) at at least one attachment point (P1, P2, P3) is set,

wherein the attachment region (11) is designed to dampen an acoustic excitation of the carrier surface (10), characterized in that at least one attachment surface (110) is formed on the attachment region (11), at which the at least one attachment point (P1, P2, P3 ) is provided for the drive unit (2) and which has a wall thickness (d2) which is reduced relative to a wall thickness (d1) on the attachment surface (110) of adjacent portions of the support surface (10).

Second support assembly according to claim 1, characterized in that the wall thickness (d2) of the attachment surface (110) relative to the wall thickness (d1) of adjacent portions of the support surface (10) is reduced by at least 10%.

3. support assembly according to claim 2, characterized in that the wall thickness (d2) of the attachment surface (1 10) compared to the wall thickness (d1) of adjacent portions of the support surface (10) is reduced by a maximum of 70%.

4. carrier assembly according to claim 3, characterized in that the wall thickness (d2) of the mounting surface (1 10) compared to the wall thickness (d1) of adjacent portions of the support surface (10) is reduced by at least 12% and a maximum of 45%.

5. Carrier assembly according to one of the preceding claims, characterized in that the wall thickness (d2) of the attachment surface (110) in the range of 0.014 mm to 1, 7 mm, in particular in the range of 0.7 mm to 1, 3 mm.

6. Carrier assembly according to one of the preceding claims, characterized in that a wall thickness (d1) of the support surface (10) is at least 0.5, in particular at least 1 mm or at least 1, 4 mm.

7. support assembly according to one of the preceding claims, characterized in that the mounting surface (1 10) of reduced wall thickness (d2) on the support surface (10) is formed.

8. Carrier assembly according to one of the preceding claims, characterized in that on the mounting region (11), a transition region (1 11) is provided, which connects the mounting surface (11) with an adjacent portion of the carrier surface (11).

9. carrier assembly according to claim 8, characterized in that the

Transition region (1 11) is formed with respect to the adjacent portion of the support surface (10) of lower rigidity.

10. carrier assembly according to claim 9, characterized in that the

Transition region (11 1) is formed in cross-section with a wave geometry.

1 1. Carrier assembly according to one of the preceding claims, characterized in that the drive unit (2) at least two

Fixing points (P1, P2, P3) on the support surface (10) is fixed.

12. Carrier assembly according to claim 11, characterized in that the at least two attachment points (P1, P2, P3) are provided on the at least one attachment surface (110).

13. Carrier assembly according to claim 1 1, characterized in that at the attachment region (11) at least two spatially separated mounting portions (11 A, 1 1 B, 11 C) are each formed with a mounting surface (1 10) and at each mounting surface ( 110) of an attachment portion (11 A, 1 1 B, 1 1 C) at least one attachment point (P1, P2, P3) is provided for the drive unit.

14 carrier assembly according to claim 13, characterized in that mounting surfaces (110) of the at least two spatially separated mounting portions (11 A, 11 B, 11 C) have mutually different wall thicknesses.

15. Carrier assembly according to one of the preceding claims, characterized in that on the mounting surface (1 10) a damping mass (M) for damping an acoustic excitation of the support surface (10) is provided.

16. Window lift for adjusting a window of a vehicle with a

Carrier assembly according to one of claims 1 to 15.

17. Door module for a vehicle with a carrier assembly according to one of claims 1 to 15.