A front subframe reinforcement bracket structure for improving the rigidity of the rear suspension mounting point

Abstract

The invention provides a front sub-frame reinforced supporting structure for promoting the rigidity of a rear suspension mounting point. The rigidity of the rear suspension mounting point of an engine can be effectively promoted, the modal rigidity of a sub-frame under the mounting state of a vehicle body can further be met, and the NVH performance of a vehicle is promoted. The front sub-frame reinforced supporting structure comprises a front sub-frame body, front longitudinal beams and reinforced supports, one ends of the reinforced supports are connected with front lap beams of the front sub-frame body, and the other ends of the reinforced supports are connected with the front longitudinal beams. According to the front sub-frame reinforced supporting structure for promoting the rigidity of the rear suspension mounting point, through adding the two reinforced supports, the connecting relation of a front sub-frame and the front longitudinal beams of a vehicle body are strengthened, the rigidity of the rear suspension mounting point of the engine on the sub-frame is promoted, and particularly, the Z-directional rigidity of the rear suspension mounting point of the engine can be improved obviously; the Z-directional control over engine excitation and road excitation is facilitated, the vibration transmitted by the front sub-frame on the vehicle body can be effectively controlled, and the vibration isolation ratio is improved; and the in-car vibration amplitude transmitted by a road surface and the power assembly is lowered, so that the NVH performance of the vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of automobile chassis, in particular to a front sub-frame reinforcement bracket structure for improving the rigidity of rear suspension installation points. Background technique [0002] The automotive powertrain mount system is a bridge connecting the powertrain and the car body, and plays an important role in load bearing, position limiting and vibration isolation. In order to save space, the rear suspension of most models is installed on the front sub-frame. As customers have higher and higher requirements for NVH performance, major automobile manufacturers have higher requirements for the stiffness of chassis connectors. The stiffness of the rear suspension installation point, especially the Z-direction stiffness, is the weak link of general models, and it is also a key consideration in design, so it has received more attention. [0003] The existing front subframe and the body are connected and fixed ...

AI Technical Summary

Problems solved by technology

[0003] The existing front sub-frame and the body are connected and fixed at four points, which cannot well control the vibration transmitted from the powertrain and the road surface to the interior of the car, which affects the NVH performance of the car

Some models adopt methods such as ribbing around the rear suspension installation point or moving the installation position backward, but the effect is not obvious, and the rear suspension installation point is still difficult to achieve an ideal stiffness value

[0004] In the patent "Sub-frame Structure of Vehicles and Vehicles" (Patent Publication No.: CN204355147U), a front sub-frame structure was invented, including the upper plate and the lower plate of the rear beam. The rear suspension reinforcement arranged at the installation point, although the stiffness of the rear suspension installation point has been improved to a certain extent, it has not strengthened the connection between the front sub-frame and the body, so the improvement is limited, and the front sub-frame has not been effectively improved. The stiffness of the frame itself and the modal frequency in the body installation state

Images