CN-122008970-A - Vehicle lower structure

CN122008970ACN 122008970 ACN122008970 ACN 122008970ACN-122008970-A

Abstract

A vehicle lower structure includes a pair of side members, a seat cross member to which both ends in a vehicle width direction are coupled, a seat frame that is mounted on the seat cross member via an outside mounting point and an inside mounting point located on an inner side in the vehicle width direction than the outside mounting point, and a cross spacer that is mounted on the seat cross member in the vicinity of the inside mounting point than the outside mounting point and locally reinforces the seat cross member.

Inventors

TAKAYOSHI SHIGIHARA

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260512
Application Date: 20251107
Priority Date: 20241111

Claims (4)

1. A vehicle lower structure is characterized by comprising: a pair of side members; A seat cross member, both ends of which in the vehicle width direction are respectively joined to the pair of side members; A seat frame that is mounted on the seat cross member via an outside mounting point and an inside mounting point located at a vehicle width direction inner side than the outside mounting point; A cross spacer that is mounted on the seat cross member in the vicinity of the inboard mounting point compared to the outboard mounting point and locally reinforces the seat cross member.
2. The vehicle lower structure according to claim 1, characterized in that, There is also a battery pack disposed under the seat cross member, The battery pack is provided with: A battery case having an upper case and a lower case; a battery module that is housed in the battery case; a resin plate that is filled between the upper surface of the battery module and the upper case and is bonded to both the battery module and the upper case, The seat cross member is secured to the upper housing.
3. The vehicle lower structure according to claim 1, characterized in that, Having a front seat cross member and a rear seat cross member positioned rearward of the front seat cross member, The front seat cross member and the rear seat cross member have the outboard mounting point, the inboard mounting point, and the cross-directional bulkhead, respectively, The rigidity of the cross partition of the rear seat cross member is higher than the rigidity of the cross partition of the front seat cross member.
4. The vehicle lower structure according to claim 1, characterized in that, The seat cross member has an upper flange joined to an upper surface of the side member and a cross flange joined to a vehicle width direction inner side surface of the side member, The bonding force of the transverse flange and the side member is smaller than that of the upper flange and the side member.

Description

Vehicle lower structure Technical Field A vehicle lower structure having a pair of side members and a seat cross member to which a seat frame is fastened is disclosed. Background In general, in a vehicle, two seats functioning as a driver seat and a passenger seat are arranged in a row in a vehicle width direction. The frame of the seat is mounted on a skeletal component known as a seat cross member. The seat cross member is a frame member extending in the vehicle width direction, and both ends thereof are fastened to the frame member called a side member. Generally, two seat cross members are arranged at intervals in the vehicle front-rear direction. The left and right ends of the front side of the seat frame are mounted on the front side seat cross member, and the left and right ends of the rear side of the seat frame are mounted on the rear side seat cross member. Thus, typically the four corners of the seat frame are mounted to the seat cross member via four mounting points. Disclosure of Invention In the past, the respective rigidities of the four mounting points were largely different from each other. Specifically, the rigidity of the mounting point located on the vehicle width direction outer side is much higher than the rigidity of the mounting point located on the vehicle width direction inner side. As a result, when a load is applied to the vehicle, the periphery of the mounting point on the vehicle width direction inner side is easily deformed as compared with the periphery of the mounting point on the vehicle width direction outer side. Further, this causes a problem that the posture of the seat is changed, and the comfort of the occupant is impaired. In addition, japanese patent application laid-open No. 07-081626 discloses a structure in which a reinforcing member called a bulkhead is disposed at an end portion of a cross member in a vehicle width direction. According to this technique, the impact force at the time of a side collision can be effectively absorbed in the bulkhead and the center cross member. However, in the case of using the technique of japanese patent application laid-open No. 07-081626, the difference in rigidity between the vehicle width direction end portions and the vehicle width direction center portion of the cross member is large. Due to such a difference in rigidity, the central portion of the cross member changes to a greater extent than the end portions when the vehicle is traveling. And, thereby, the posture of the seat mounted on the cross member is easily changed. Accordingly, a vehicle lower structure capable of more effectively preventing a change in the posture of a seat is disclosed. The vehicle lower structure disclosed in the present specification is characterized by being provided with a pair of side members, a seat cross member to which both ends in a vehicle width direction are respectively joined, a seat frame that is attached to the seat cross member via an outside attachment point and an inside attachment point located on the vehicle width direction inner side than the outside attachment point, and a cross spacer that is attached to the seat cross member in the vicinity of the inside attachment point than the outside attachment point, thereby locally reinforcing the seat cross member. By adopting this structure, the rigidity of the periphery of the medial mounting point becomes high, and the difference in rigidity between the medial mounting point and the lateral mounting point becomes small. As a result, the tilting of the seat in the roll direction can be effectively suppressed. The vehicle lower structure disclosed in the present specification may further include a battery pack disposed below the seat cross member, the battery pack including a battery case having an upper case and a lower case, a battery module housed in the battery case, and a resin plate filled between an upper surface of the battery module and the upper case and bonded to both of the battery module and the upper case, the seat cross member being fixed to the upper case. By disposing the resin plate inside the battery case, the surface rigidity of the upper case functioning as the floor of the vehicle cabin is improved. Further, the rigidity of the entire seat cross member is thereby improved, and tilting of the seat in the roll direction is suppressed. Further, the vehicle lower structure disclosed in the present specification may be configured to have a front seat cross member and a rear seat cross member located rearward of the front seat cross member, the front seat cross member and the rear seat cross member each having the outboard mounting point, the inboard mounting point, and the cross member of the rear seat cross member may have a higher rigidity than the cross member of the front seat cross member. By providing this structure, the difference in rigidity between the front-side mounting point and the rear-side mounting point becomes small, thereby further suppressing the