Mazda Motor Corporation

Ken Yamada

Hidenori Matsuoka

Akiyoshi Masuda

Hideyuki Tsukamoto

Koji Matsushita

Koji Yoshimura

Kazuki Yamauchi

Masanobu Fukushima

Hiroaki Takeshita

Shunsuke Hirai

Yasuhiko Nishida

Hidekazu Shiraishi

Kouji Matsushita

Hiroaki Ishizu

Takumi Fukuda

Hidemitsu Shinhara

Masashi Notomi

Masahiro Awane

Hajime Ito

Yuuki Sano

Takanori Yoshida

Provided is a rear vehicle-body structure of a vehicle, capable of reducing vibrations transmitted from a rear wheel to a floor panel, while ensuring required performance for rear side frames and a cross member. The rear vehicle-body structure comprises a symmetric pair of frame members extending in a vehicle longitudinal direction along respective lateral sides of a rear of a vehicle body of the vehicle, and a rear-side rear cross member bridging the symmetric pair of frame members in a vehicle width direction, wherein an attachment portion between each of the frame members and the rear-side rear cross member provided with rigidity difference generation part to generate a rigidity difference between the frame member and the rear-side rear cross member.

Rear vehicle-body structure of vehicle

A vehicle-body structure comprises a pair of right-and-left crash cans provided at an end portion of a vehicle body, being spaced apart from each other in a vehicle width direction, a bumper reinforcement extending in the vehicle width direction and connecting respective tip portions of the crash cans, set plates interposed between each of the crash cans and a vehicle-body side frame, wherein each of the crash cans is fixed to the vehicle-body side frame via the set plates, and a brace extending obliquely, in a plan view, from an inward side, in the vehicle width direction, of the crash can or the set plate to the bumper reinforcement such that a space is formed, in the vehicle with direction, between the brace and the crash can. The brace is fixedly joined to a lower face of the bumper reinforcement.

Vehicle-body structure

Provided is a rear vehicle body structure that includes: a right and left pair of frame members each extending in a front-rear direction and having a damper supporting part; rear wheel wells; a rear floor panel; a rear cross member upper part connecting the right and left pair of frame members to each other on a front side of the damper supporting parts; front side reinforcements provided along a vehicle cabin inner side of each of the rear wheel wells and extending in an up-down direction on the front side of the damper supporting parts; and a reinforcing member mounted on each of the frame members and having a reinforcing member main body that reinforces the damper supporting part and a reinforcing member coupling part that couples together the rear cross member upper part and the front side reinforcement.

Rear vehicle body structure

A recessed portion is formed at a frame member provided at a rear portion of a vehicle body and having a closed cross section extending in a vehicle longitudinal direction such that a part of a lower face of the frame member is recessed upwardly, where a damper of a rear suspension is inserted and fixed. A front portion of the frame member is joined to a side sill extending in the vehicle longitudinal direction at a position offset outwardly in a vehicle width direction from the frame member. Branch-shaped closed cross sections branching off from the closed cross section inwardly and outwardly relative to the damper are formed at a position corresponding to the recessed portion of the frame member. A portion of the frame member located at the above-described position is wide outwardly.

Rear vehicle-body structure

A recessed portion is formed at a frame member provided at a rear portion of a vehicle body and having a closed cross section extending in a vehicle longitudinal direction, wherein the recessed portion is configured such that a lower face of the frame member is recessed upwardly and a damper is inserted into and fixed to the recessed portion. Closed cross sections are formed inside the frame member at a position corresponding to the recessed portion. These closed cross sections are configured to branch off from the closed cross section outwardly and inwardly relative to the damper. A reinforcing member is fixed to the frame member and a wheel house inner at the position corresponding to the recessed portion such that a space is formed at a corner portion of these.

A recessed portion is formed at a lower face of a frame member provided at a vehicle rear portion and having a closed cross section extending in a vehicle longitudinal direction, where a damper of a rear suspension is inserted into and fixed. A front portion of the frame member is joined to a side sill extending in the vehicle longitudinal direction at a position offset outwardly from the frame member. Branch-shaped closed cross sections branching off from the closed cross section inwardly and outwardly relative to the damper are formed at a recessed-portion corresponding position. A front portion of the frame member located in front of the recessed-portion corresponding position extends in an oblique direction forwardly and outwardly and a front end of the frame member is joined to a rear portion of the side sill.

A recessed portion is formed at a frame member provided at a rear portion of a vehicle body and having a closed cross section extending in a vehicle longitudinal direction such that a part of a lower face of the frame member is recessed upwardly, where a damper of a rear suspension is inserted and fixed. Closed cross sections are formed at a position corresponding to the recessed portion, in a longitudinal direction, of the frame member. The closed cross sections are configured to branch off from the closed cross section inwardly and outwardly in the vehicle width direction relative to the damper. A ridgeline extending in the vehicle longitudinal direction is formed at least at a portion of the frame member which is positioned in front of the recessed portion.

A rear side frame comprises a front-side frame and a rear-side frame which is provided in back of the front-side frame and configured such that a strength thereof against compressing of an axial direction is lower than that of the front-side frame, a rear end portion of the front-side frame and a front end portion of the rear-side frame are overlapped, and another vehicle-body member is connected to an overlap portion where the rear end portion of the front-side frame and the front end portion of the rear-side frame are overlapped.

Reach vehicle-body structure of vehicle

In a rear vehicle-body structure of a vehicle provided with rear side frames, a first deformation promotion portion (recess portions) to promote inward deformation of the rear side frame is provided at each of both-side side face portions of the rear side frame, a second deformation promotion portion (opening portions) to promote outward deformation of the rear side frame is provided at a lower face portion of the rear side frame, and the first deformation promotion portion and the second deformation promotion portion are alternately arranged in an axial direction of the rear side frame.

A pair of rear side frames respectively comprise front bending-promotion portions, middle bending-promotion portions and rear bending-promotion portions which cause the rear side frames to bend inward, in a vehicle width direction, in a trough-folding shape in a rear collision of a vehicle, and a longitudinal distance Lbetween the front bending-promotion portions and the middle bending-promotion portions is set to be longer than a longitudinal direction Lbetween the middle bending-promotion portions and the rear bending-promotion portions. Thereby, there is provided a rear vehicle-body structure of an automotive vehicle which can properly absorb a collision load at a vehicle-body rear portion, even if a rear side frame is made from material which may not cause smooth bucking of the rear side frame.

Rear vehicle-body structure of automotive vehicle

In a lower vehicle-body structure of a vehicle, there is provided a rear connecting member swingably supporting a rear portion of a lower arm at a sub frame and a front side frame, the rear connecting member comprising a support portion to support the lower arm, a fifth connection portion to connect the sub frame and the support portion, and a fourth connection portion to connect the front side frame and the support portion. Further, there is provided a separation mechanism to separate the fourth connection portion off the front side frame in the vehicle frontal collision. Accordingly, the sub frame and the lower arm are separated off the front side frame by the separation mechanism.

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Hatsukaichi, Japan

Ken Yamada