US-12623723-B2 - Unit mounting in a vehicle

US12623723B2US 12623723 B2US12623723 B2US 12623723B2US-12623723-B2

Abstract

A unit mounting in a vehicle, in which a drive unit is attached via a unit bearing to a body-side bearing bracket, which unit bearing is a rubber-metal bearing having a sleeve-shaped bearing core, which is screwed together with the body-side bearing bracket by a bearing bolt guided through the sleeve-shaped bearing core. The drive unit has a unit housing, in which a bearing receptacle is formed for the unit bearing. The housing-side bearing receptacle is formed as a bearing cup open on one side having a hollow cylindrical receptacle space, specifically in particular having a closed bearing base, from which a cylindrical circumferential peripheral wall is raised.

Inventors

Gilbert Schantl
Marek Bujak
Stefan Rugies
Hans-Peter Frensch
Andreas Weber
Korbinian Weber
Thomas Wittenschläger

Assignees

AUDI AG

Dates

Publication Date: 20260512
Application Date: 20200504
Priority Date: 20190507

Claims (16)

1 . A unit mounting in a vehicle comprising: a drive unit attached via a unit bearing to a body-side bearing bracket, wherein the unit bearing is a rubber-metal bearing having a sleeve-shaped bearing core, which is screwed together by an internal thread with the body-side bearing bracket by a bearing bolt guided through the sleeve-shaped bearing core, a shaft of the bearing bolt is configured to engage with the internal thread of the sleeve-shaped bearing core and a bolt head, the body-side bearing bracket comprises a main body and an adapter part configured to be screwed onto the main body using a ring flange, wherein a circumferential profile wall raised from an opening edge region of a screw hole of the adapter part merges radially outward into the ring flange; a unit housing; a bearing cup that is closed on a first side and open on a second side and configured to provide one-sided installation access, the first side being opposite to the second side, wherein an outer bearing sleeve of the unit bearing is pressed into the first side of the bearing cup, which is formed from a same material and in one piece on the unit housing, and the bearing cup further comprises a hollow cylindrical space delimited by both a closed bearing base and a cylindrical circumferential peripheral wall raised from the closed bearing base.
2 . The unit mounting as claimed in claim 1 , wherein the shaft of the bearing bolt is further configured to be guided with hole clearance through the screw hole of the adapter part, the bolt head is supported on the opening edge region of the screw hole facing away from the unit bearing, and the body-side bearing bracket is clamped with the opening edge region between the bolt head and an end face of the sleeve-shaped bearing core.
3 . The unit mounting as claimed in claim 1 , wherein a rotation lock is assigned to the sleeve-shaped bearing core, by which the sleeve-shaped bearing core is configured to remain rotationally fixed during the screwing/unscrewing of the bearing bolt, and the rotation lock is formed between the bearing core and the body-side bearing bracket as a formfitting contour.
4 . The unit mounting of claim 1 , wherein the body-side bearing bracket is detachably installed, in a screw connection, on the main body and the bolt head is supported on the opening edge region of the screw hole of the adapter part.
5 . The unit mounting as claimed in claim 4 , wherein screw axes of screw connections of the adapter part onto the main body are oriented axially parallel to a bearing axis.
6 . The unit mounting as claimed in claim 5 , wherein the adapter part is a shell-shaped profile part, having the opening edge region as a profile base, and the screw connections are circumferentially distributed on the ring flange.
7 . The unit mounting as claimed in claim 5 , wherein an installation space for the bolt head of the bearing bolt is provided between the adapter part and the main body.
8 . The unit mounting as claimed in claim 1 , wherein the bolt head of the bearing bolt is arranged in an installation space between a joining face and the opening edge region, and a bolt shaft of the bearing bolt is configured to be guided with hole clearance through the screw hole of the adapter part.
9 . The unit mounting as claimed in claim 8 , wherein the body-side bearing bracket further comprises: a clamping part, wherein the main body, the adapter part, and the clamping part are connected by a horizontal joining plane parallel to a bearing bolt screw axis.
10 . The unit mounting as claimed in claim 2 , wherein a rotation lock is assigned to the sleeve-shaped bearing core, by which the sleeve-shaped bearing core is configured to remain rotationally fixed during the screwing/unscrewing of the bearing bolt, and the rotation lock is formed between the bearing core and the body-side bearing bracket as a formfitting contour.
11 . The unit mounting of claim 2 , wherein the body-side bearing bracket is detachably installed, in a screw connection, on the main body, and the bolt head is supported on the opening edge region of the screw hole of the adapter part.
12 . The unit mounting of claim 3 , wherein the body-side bearing bracket is detachably installed in a screw connection on the main body, and the bolt head is supported on the opening edge region of the screw hole of the adapter part.
13 . The unit mounting as claimed in claim 6 , wherein an installation space for the bolt head of the bearing bolt is provided between the adapter part and the main body.
14 . The unit mounting as claimed in claim 2 , wherein the bolt head of the bearing bolt is arranged in an installation space between a joining face and the opening edge region.
15 . The unit mounting as claimed in claim 1 , wherein a rotation lock is assigned to the sleeve-shaped bearing core, by which the sleeve-shaped bearing core is configured to remain rotationally fixed during the screwing/unscrewing of the bearing bolt, and the rotation lock is formed between the bearing core and the unit housing as a formfitting contour.
16 . The unit mounting as claimed in claim 2 , wherein a rotation lock is assigned to the sleeve-shaped bearing core, by which the sleeve-shaped bearing core is configured to remain rotationally fixed during the screwing/unscrewing of the bearing bolt, and the rotation lock is formed between the bearing core and the unit housing as a formfitting contour.

Description

FIELD The invention relates to a unit mounting in a vehicle. BACKGROUND Summary The drive unit of a vehicle, such as an internal combustion engine or an electric machine, is typically mounted in a motor compartment of the vehicle via vibration-damping unit bearings on a support structure, such as an axle support or auxiliary frame, of the vehicle body, for example, in a three-point or four-point mounting. In a generic unit mounting, the drive unit is attached via a unit bearing to a body-side bearing bracket. The unit bearing is implemented as a rubber-metal bearing having a sleeve-shaped bearing core, which is screwed onto the body-side bearing bracket by means of a bearing bolt guided through the sleeve-shaped bearing core. The unit housing has a bearing receptacle into which the unit bearing is inserted (in particular pressed in). In the prior art, the housing-fixed bearing receptacle can be implemented as a bearing eye open on both sides in the axial direction, which has a hollow cylindrical receptacle space into which the unit bearing is pressed. The attachment of the housing-fixed unit bearing to the bearing bracket can be implemented as follows: The bearing bracket can thus have two bracket wings which are positioned axially on both sides of the sleeve-shaped bearing core of the unit bearing. The two bracket wings and the interposed bearing core are screwed together to form an axial press group with the aid of a bearing bolt. The bearing bolt extends with its bolt shaft through the sleeve-shaped bearing core, wherein the two bracket wings and the sleeve-shaped bearing core are clamped in the axial direction between a bolt head of the bearing bolt and a screw nut, which is screwed together with the bolt shaft. In the above prior art, the attachment of the unit bearing to the bearing bracket is linked to both installation space expenditure and component expenditure. Moreover, tool access to the unit bearing is required on both sides in the axial direction to enable installation or removal of the drive unit. An auxiliary frame for a motor vehicle is known from DE 10 2013 007 976 A1. A subframe for a motor vehicle is known from DE 199 09 945 C1. An arrangement of an electric motor unit in the motor compartment of a motor vehicle is known from DE 10 2012 012 327 A1. The object of the invention is to provide a unit mounting for a drive unit, in which the unit mounting is implementable with a greater number of degrees of freedom in comparison to the prior art with reduced installation space expenditure and/or with reduced component requirement in comparison to the prior art. According to the characterizing part of the disclosure, the housing-side bearing receptacle is not implemented as a bearing eye open on both sides axially but rather as a bearing cup open on one side, specifically with a closed bearing base from which a cylindrical peripheral circumferential wall is raised. The housing-fixed bearing receptacle formed as a bearing cup provides only a one-sided installation access for inserting, in particular pressing in the unit bearing. In a first technical implementation, the attachment of the unit bearing to the bearing bracket can be implemented as follows: The sleeve-shaped bearing core of the unit bearing can thus have an internal thread with which the bearing bolt is screwed together. In this case, a screw nut can be omitted to implement the screw connection to the unit bearing. The bearing bolt can have a bolt shaft, which can be brought into threaded engagement with the internal thread of the bearing core, and a bolt head. The bolt shaft can be guided with hole clearance through a screw hole of the bearing bracket, while the bolt head is supportable on an opening edge region of the bearing bracket screw hole facing away from the unit bearing. In this case, the bearing bracket can be clamped with its opening edge region between the bolt head and an end face (facing toward the bearing bracket) of the sleeve-shaped bearing core. With regard to a screwing/unscrewing process of the bearing bolt that can be carried out properly, it is preferred if a rotation lock is assigned to the sleeve-shaped bearing core. With the aid of the rotation lock, the sleeve-shaped bearing core can be held in a rotationally fixed manner during the screwing/unscrewing of the bearing bolt. The rotation lock can be formed, for example, between the bearing core and the bearing bracket or alternatively between the bearing core and the unit housing, in particular as interlocking formfitting contours. For a simple installation/removal of the drive unit into or out of the vehicle motor compartment, it is preferred if the bearing bracket is embodied in at least two parts. For example, the bearing bracket can have a body-fixed main body and an adapter part. The adapter part can be removably installed on the main body, in particular in a screw connection. It is preferred if both the bearing bracket screw hole, through which the bolt