The invention discloses an electric power-assisted steering gear, which relates to the technical field of automobile steering gears, and comprises a shell, an input shaft, a torsion bar, a power-assisted speed reduction structure, a roller screw pair and a rocker arm shaft, and the shell comprises an upper shell, a middle shell and a lower shell which are sequentially connected through bolts; the input shaft, the torsion bar, the power-assisted speed-reducing structure, the roller screw pair and the rocker arm shaft are all arranged in the shell, the first end of the torsion bar is connected with an inner hole of the input shaft, and the second end of the torsion bar is connected with the input end of the screw; compared with a ball screw pair of the same specification, the planetary roller screw pair is adopted, the bearing capacity is more than three times higher, the impact load bearing capacity is higher, the service life is longer, the lead design range is wide, small-lead and large-reduction-ratio transmission can be achieved, large-lead and small-reduction-ratio transmission can also be achieved, and the service life is prolonged. Therefore, the pure electric power-assisted steering device is widely applicable to light, medium and heavy commercial vehicles, and the heavy commercial vehicles can realize pure electric power-assisted steering by matching with the roller lead screw pair with small lead and large reduction ratio.
本发明公开了一种电动助力转向器,涉及汽车转向器技术领域,包括壳体、输入轴、扭杆、助力减速结构、滚柱丝杠副以及摇臂轴,壳体包括依次通过螺栓连接的上壳体、中间壳体和下壳体,输入轴、扭杆、助力减速结构、滚柱丝杠副以及摇臂轴均设于壳体内,扭杆第一端与输入轴内孔连接,扭杆第二端与丝杠输入端连接;采用行星式滚柱丝杠副,比同规格滚珠丝杠副承载能力高出三倍以上,承受冲击载荷能力更强,使用寿命更长,采用行星式滚柱丝杠副,导程设计范围广,即可实现小导程、大减速比传动,又可实现大导程、小减速比传动,从而使本发明广泛适用于轻、中、重型商用车,通过匹配小导程、大减速比的滚柱丝杠副,可以使重型商用车实现纯电动助力转向。
Electric power steering gear
一种电动助力转向器
2022-12-06
Patent
Electronic Resource
Chinese
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |