公开(公告)号：US20150298725A1

公开(公告)日：2015-10-22

申请号：US14442780

申请日：2013-07-26

Applicant: NSK Ltd.

Inventor： Takefumi KICHIKAWA ,  Takeshi MURAKAMI ,  Takeshi YAMAMOTO ,  Atsushi MAEDA ,  Tatsuya ISHII

IPC: B62D5/04 ,  B62D6/10

CPC classification number: B62D5/0403 ,  B62D5/0409 ,  B62D6/10 ,  F16C19/06 ,  F16C35/042 ,  F16C35/067 ,  F16C2326/24

Abstract: According to an electric power steering system of the present invention, a bearing support housing member supporting at least one rolling bearing is preferably formed of a resin which can be continuously used in a temperature environment ranging from −40° C. to 85° C., which is made of a resin composition containing a fibrous filler ranging from 30% by mass to 55% by mass, which has a coefficient of linear expansion ranging from 1.2×10−5 to 5.5×10−5 (1/° C.) in both a fiber direction and a perpendicular direction to the fiber direction in a temperature range from 23° C. to 80° C., and which has a coefficient of water absorption equal to or less than 4% when being left in water at a temperature of 23° C. for 24 hours.

Abstract translation: 根据本发明的电动助力转向系统，支撑至少一个滚动轴承的轴承支撑壳体优选地由可在-40℃至85℃的温度环境中连续使用的树脂形成。 其由线性膨胀系数为1.2×10 -5〜5.5×10 -5（1 /℃）的含有30质量％〜55质量％的纤维状填料的树脂组合物构成。 ）在纤维方向和垂直于纤维方向的方向上，在23℃至80℃的温度范围内，并且当水分在水中时具有等于或小于4％的吸水系数 温度23℃24小时。