Sub frame structure of vehicle

Patent metadata

Field	Value
Publication number	US-9616933-B2
Application number	US-201614987057-A
Country	US
Kind code	B2
Filing date	Jan 4, 2016
Priority date	Jan 16, 2015
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A sub frame structure of a vehicle comprises a pair of right-and-left side members extending in a vehicle longitudinal direction, to which a pair of right-and-left upper-side lower arm supporting rear wheels are pivotally connected, a rear cross member holding the vicinity of rear ends of the side members, and a front cross member interconnecting the side members in a vehicle width direction and being positioned in front of the rear cross member, being spaced apart from the rear cross member. The side member includes a front support bracket and a rear member holding member to which a front connection portion and a rear connection portion of the upper-side lower arm are connected, and a displacement portion to cause the rear member holding member to be displaced forward is provided between the front support bracket and the rear member holding member.

First claim

What is claimed is:

1. A sub frame structure of a vehicle which is rigidly connected to a vehicle body, comprising:
a pair of right-and-left side members extending in a vehicle longitudinal direction, to which a pair of right-and-left arm members supporting right-and-left rear wheels are pivotally connected, each of the arm members including two front-and-rear connection portions to be pivotally connected to the side member, the two front-and-rear connection portions being spaced apart from each other such that the arm member rotates vertically around a rotational axis connecting the two front-and-rear connection portions; and
a rear cross member holding the vicinity of respective rear ends of the pair of right-and-left side members; and
a front cross member interconnecting the pair of right-and-left side members in a vehicle width direction and being positioned in front of the rear cross member, being spaced apart from the rear cross member,
wherein each of said side members includes two front-and-rear arm connection portions which support said two front-and-rear connection portions of the arm member, respectively, said rear arm connection portion is positioned at a lower level than said front arm connection portion, and a portion of the side member which is located near said rear arm connection portion is configured to be weaker than another portion of the side member which is located near said front arm connection portion, whereby the rear arm connection portion is caused to be displaced so as to rotate forward and downward around the front arm connection portion when receiving a longitudinal load in a vehicle rear collision.

2. A sub frame structure of the vehicle, which is rigidly connected to a vehicle body, comprising:
a pair of right-and-left side members extending in a vehicle longitudinal direction, to which a pair of right-and-left arm members supporting right-and-left rear wheels are pivotally connected, each of the arm members including two front-and-rear connection portions to be pivotally connected to the side member, the two front-and-rear connection portions being spaced apart from each other such that the arm member rotates vertically around a rotational axis connecting the two front-and-rear connection portions; and
a rear cross member holding the vicinity of respective rear ends of the pair of right-and-left side members; and
a front cross member interconnecting the pair of right-and-left side members in a vehicle width direction and being positioned in front of the rear cross member, being spaced apart from the rear cross member,
wherein each of said side members includes two front-and-rear arm connection portions which support said two front-and-rear connection portions of the arm member, respectively, said rear arm connection portion is positioned at a lower level than said front arm connection portion, and a bending portion is provided at a position of the side member which is located in back of said front arm connection portion and configured to bend downward and then rearward, whereby the rear arm connection portion is caused to be displaced so as to rotate forward and downward around the front arm connection portion when receiving a longitudinal load in a vehicle rear collision.

3. A sub frame structure of the vehicle, which is rigidly connected to a vehicle body, comprising:
a pair of right-and-left side members extending in a vehicle longitudinal direction, to which a pair of right-and-left arm members supporting right-and-left rear wheels are pivotally connected, each of the arm members including two front-and-rear connection portions to be pivotally connected to the side member, the two front-and-rear connection portions being spaced apart from each other such that the arm member rotates vertically around a rotational axis connecting the two front-and-rear connection portions; and
a rear cross member holding the vicinity of respective rear ends of the pair of right-and-left side members; and
a front cross member interconnecting the pair of right-and-left side members in a vehicle width direction and being positioned in front of the rear cross member, being spaced apart from the rear cross member,
wherein each of said side members includes two front-and-rear arm connection portions which support said two front-and-rear connection portions of the arm member, respectively, said rear arm connection portion is positioned at a lower level than said front arm connection portion, a weak portion is provided at a position of the side member which is located near said rear arm connection portion, the weak portion being configured to be weaker than another portion of said side member which is located near said front arm connection portion, and a bending portion is provided at a position of the side member which is located in back of said front arm connection portion, the bending portion being configured to bend downward and then rearward, whereby the rear arm connection portion is caused to be displaced so as to rotate forward and downward around the front arm connection portion when receiving a longitudinal load in a vehicle rear collision.

Assignees

• Mazda Motor

Inventors

• Tanaka Masaaki

Classifications

• B62D21/11 Primary

  with resilient means for suspension {, e.g. of wheels or engine; sub-frames for mounting engine or suspensions} · CPC title

• B62D21/155 Primary

  Sub-frames or underguards · CPC title

• B60G7/001

  Suspension arms, e.g. constructional features (B60G7/006 takes precedence) · CPC title

• B60G2206/604

  with two parallel beams connected by cross members · CPC title

• B60G7/02

  Attaching arms to sprung part of vehicle {(B60G7/006 takes precedence)} · CPC title