KR20230072611A - Design structure of stay for vehicles to protect the safety of passengers - Google Patents

Abstract

The present invention relates to a stay design structure for a vehicle that protects the safety of an occupant through shock absorption, and in order to increase the collapse strength of the stay inner, the thickness of the stay inner is set to 2.2 mm, compared to the conventional thickness. increase, add 2 beads instead of 8 notches to the stay inner, move the position of the bead to the rear by 21.5mm, and change the structure of the stay to a straight part with an outer area of 66mm, 27mm and 14mm It consists of a triangular oblique part with sides and a straight part of 47mm, forming an octagonal shape that occupies an area of 8,244. It is possible to protect the safety of occupants by maximally absorbing the impact transmitted to the interior in the event of a collision while minimizing the increase in maximum load by absorbing the impact applied to the side member by changing the shape. In addition, it is an invention related to a stay design structure for a vehicle that protects the safety of occupants, which has the advantage of not requiring a large change in the structure and size of other conventional fastened parts because there is no significant difference in area from the conventional stay.

Description

Design structure of stay for vehicles to protect the safety of passengers}

The present invention relates to a stay design structure for a vehicle that protects the safety of an occupant through shock absorption.

According to statistics in 2016, in the current era when there are more than 40 million driver's license holders, the number of traffic accidents per 10,000 cars reaches 86.4. Traffic accidents occur for various reasons, but in terms of their behavior, various types of accidents such as collisions with objects and collisions with living things account for the overall weight. In order to respond to collisions that occur in various forms, there are front bumpers and rear bumpers for the purpose of absorbing shock from front and rear collisions, and the bumpers are structured with bumper covers, side members, stays, and back beams. When an impact occurs to the vehicle from the front or rear, the structures cause crushing and absorb the impact to minimize the impact transmitted to the interior.

In the event of a vehicle collision, stable crushing occurs at the front of the impact area, and the shock transmitted to the interior can be prevented only when the rear end, which is close to the interior, endures without deformation while absorbing the impact. Conventional stays deform the front frame and side members due to poor shock absorption, which may cause problems such as fatal injuries to occupants by transmitting shocks to the interior.

In order to increase the collapse strength of the stay inner, the thickness of the stay inner is increased to 2.2 mm from the conventional thickness, 2 beads are added instead of 8 notches to the stay inner, and the position of the bead is 21.5 mm backward. The structure of the stay is formed into an octagonal shape, which occupies an area of 8,244, consisting of a linear portion of 66 mm in the outer area of the octagonal cross section, a triangular oblique portion with two sides of 27 mm and 14 mm, and a linear portion of 47 mm.

Due to the increase in the collapse strength of the stay inner, the thickness is increased to maintain a certain level of strength to induce sufficient compression collapse of the stay, and the impact applied to the side member is changed by changing the shape to minimize the increase in maximum load and in the event of a collision The safety of occupants can be protected by maximally absorbing shock transmitted to the interior. In addition, there is no significant difference from the conventional stay in terms of its area, so it does not require a large change in the structure and size of other conventional fastened parts.

Among the structures constituting the vehicle bumper, a stay is a structure that connects and fastens the body of the vehicle and the bumper, and is fastened to the side member with bolts through a front-end module mounting bracket. When a collision occurs, the vehicle collapses in the order of [bumper cover - back beam - stay - side member front part - side member center]. In particular, it is important to design the bumper stay, which is located between the bumper back beam and the side member, to sufficiently absorb shock during a collision to reduce the impact transmitted to the side member. If the shock is not sufficiently absorbed by crushing and deformation occurs in the side member, the shock that is not sufficiently absorbed is transmitted to the room. The present invention increases the collapse strength of the stay inner and increases the average load for a vehicle front structure that protects the occupant's safety by absorbing shock to prevent transmission of shock to the interior, thereby improving shock absorption performance during a collision. If the maximum load exceeds a certain limit by increasing the simple load to increase the average load, a large load is transferred to the rear of the vehicle, causing deformation of the vehicle, and this mismatch may cause safety problems for occupants. Therefore, it is necessary to protect the safety of occupants through a structural design with high efficiency, rather than simply making it heavy and strong.

In order to increase the collapse strength of the stay inner, the thickness of the stay inner is increased from 1.8mm to 2.2mm, 2 beads are added instead of 8 notches located on the edge of the stay, and the rear bead is 21.5mm rearward from the existing notch location. It is designed to effectively induce pressure collapse on the stay by moving it. Although the maximum load and the average load increased slightly due to the above changes, they do not reach the level of reaching the maximum load that threatens the safety of the occupants.

The maximum load and the average load tend to increase or decrease together in the load change caused by simple weight increase or decrease, but in the case of load change caused by structural deformation, the average load can be increased without changing the maximum load. In order to absorb the impact generated during a collision by increasing the average load due to structural deformation, the present invention increases the average load by applying an octagonal cross section to the stay. Since the height and area are almost similar to those of the existing rectangular cross section, the proportion of area occupied during design is not significantly different. In detail, the square section is 69.78 x 120.88, occupying an area of 8,435.0064, and in the case of an octagonal section, the outer area is composed of a straight part of 66 mm, a triangular oblique part with two sides of 27 mm and 14 mm, and a straight part of 47 mm, with an area of 8,244. occupies In order to measure the shock absorption performance in a collision, when the octagonal cross-section was applied to the maximum load and compression displacement up to 300mm, the load greatly increased in the stay collapse section, the impactor displacement 100mm ~ 200mm, and the shock absorption performance in a frontal collision without an increase in the maximum load can be confirmed to improve.

Claims (1)

The thickness of the stay inner is 2.2 mm to increase the collapse strength of the stay inner; 2 beads are located in the stay inner instead of 8 notches; The bead is located 21.5 mm rearward from the existing notch position; the outer area of the octagonal cross section including a 66 mm straight part, a triangular oblique part having two sides of 27 mm and 14 mm, and a 47 mm straight part has an area of 8,244 Vehicle stay design structure that protects the safety of occupants