Motor car with a fastening arrangement for fastening a subframe for a vehicle axle to a body of the motor car

Inventors: Julian Blaschke (Holzgerlingen, DE); Dietmar Kallfass (Ammerbuch, DE); Thomas Schmid (Gaertringen, DE); Pascal Collins (Leonberg, DE); Eric Schneider (Sindelfingen, DE); Gernot Kurtzer (Herrsching, DE); Michael Wirsing (Gechingen, DE); Waldemar Markstaedter (Ludwigsburg, DE)

Assignee: Mercedes-Benz Group AG

B62D21/11 B60K1/04 B62D21/155 B60K2001/0438 B60Y2306/01

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Quick Facts

Patent No.: US 12679462
App. No.: 18/717,840
Granted: Jul 14, 2026
Kind: B2

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Abstract

A motor car with a body and a fastening arrangement for fastening a subframe for a vehicle axle to the body. The subframe has respective side members and cross members and adjoins a body structure element by way of a region. An underfloor energy storage unit for an electric drive of the motor car adjoins the subframe. The subframe has a support device with a support element which support device supports the subframe on the body structure element in the event of an accident-induced movement in a direction towards the center of the motor car. The support element is arranged on the upper side of one of the side members and at a distance from the body structure element. In the assembled state there is a distance between the subframe and the energy storage unit which is greater than the distance between the support element and the body structure element.

Claims (16)

1 . A motor car, comprising:

a body with a body structure element;

a rear axle subframe ( 10 ) for a vehicle rear axle ( 12 ), wherein the rear axle subframe ( 10 ) comprises a first side member ( 18 ), a second side member ( 18 ), a front cross member ( 20 ), and a rear cross member ( 22 ) and wherein the rear axle subframe ( 10 ) adjoins the body structure element via a region ( 52 );

a fastening arrangement for fastening the rear axle subframe ( 10 ) to the body; and

an underfloor energy storage unit ( 38 ) for an electric drive of the motor car, wherein the rear axle subframe ( 10 ) adjoins the underfloor energy storage unit ( 38 );

wherein the rear axle subframe ( 10 ) has a support device ( 32 ) with at least one support element ( 30 );

wherein the at least one support element ( 30 ) is disposed on an upper side of one of the first and second side members ( 18 ) of the rear axle subframe ( 10 ), at a distance from the body structure element, and rearward of the body structure element in a longitudinal direction of the motor car;

wherein in an assembled state a first distance (A) between the rear axle subframe ( 10 ) and the underfloor energy storage unit ( 38 ) is greater than a second distance which is above the underfloor energy storage unit ( 38 ) in a vertical direction of the motor car between the at least one support element ( 30 ) on the upper side of one of the first and second side members of the rear axle subframe ( 10 ) and the body structure element of the body;

wherein, in an event of an accident-induced forward movement of the rear axle subframe ( 10 ) in the longitudinal direction of the motor car towards a center of the motor car as a result of a rear impact on the body of the motor car, the at least one support element ( 30 ) is displaced forward in the longitudinal direction of the motor car and provides support on the body structure element above the underfloor energy storage unit ( 38 ) in the vertical direction of the motor car such that the at least one support element ( 30 ) transfers a crash force of the rear impact into the body above the underfloor energy storage unit ( 38 ) in the vertical direction of the motor car via the body structure element before the rear axle subframe ( 10 ) hits the underfloor energy storage unit ( 38 ).

2 . The motor car according to claim 1 , wherein the at least one support element ( 30 ) comprises a first support element ( 30 ) and a second support element ( 30 ) and wherein the first support element ( 30 ) is disposed on the first side member ( 18 ) and the second support element ( 30 ) is disposed on the second side member ( 18 ).

3 . The motor car according to claim 1 , wherein the at least one support element ( 30 ) is an energy absorption element.

4 . The motor car according to claim 1 , wherein the body structure element is a cross member ( 48 ).

5 . The motor car according to claim 4 , wherein respective side members ( 44 ) of the body are connected to the cross member ( 48 ) and wherein the cross member ( 48 ) extends transversely to the side members ( 44 ) of the body.

6 . The motor car according to claim 5 , wherein the cross member ( 48 ) has respective mounting regions ( 60 ) adjoining the respective side members ( 44 ).

7 . The motor car according to claim 1 , wherein the at least one support element ( 30 ) is a sheet-metal formed part.

8 . The motor car according to claim 1 , wherein the at least one support element ( 30 ) is disposed on a region ( 54 ) of the one of the first and second side members ( 18 ) which slopes downwards towards the center of the motor car.