PROBLEM TO BE SOLVED: To provide a telescopic shaft having an excellent low friction performance at a high temperature.SOLUTION: A telescopic shaft for vehicle steering comprises: a resin coating on a tooth surface of a male shaft or a tooth groove surface of a female shaft; and a grease composition in a gap between the tooth surface and the tooth groove, where the grease composition having a base oil, a thickener including a diurea compound represented by general formula (I), and a chain hydrocarbon-based polymer with a weight-average molecular weight of 20,000 to 300,000, where the general formula (I) is R1-NHCONH-R2-NHCONH-R3 (in the formula, R2 denotes a 6 to 15C bivalent aromatic hydrocarbon group,and R1 and R3 independently denote respective 8 to 22C linear or branched alkyl group).SELECTED DRAWING: Figure 3
【課題】高温での低摩擦性能に優れた伸縮軸を提供する。【解決手段】雄シャフトの歯面または雌シャフトの歯溝の表面が、樹脂被膜を有するとともに、歯面と歯溝との隙間に、基油と、式(I)で表されるジウレア化合物を含む増ちょう剤と、重量平均分子量が20,000〜300,000である鎖状の炭化水素系ポリマーとを含有するグリース組成物が介在している車両ステアリング用伸縮軸。R1−NHCONH−R2−NHCONH−R3 (I)(式中、R2は炭素数6〜15の2価の芳香族炭化水素基を示す。R1及びR3は、それぞれ独立して炭素数8〜22の直鎖又は分岐アルキル基を示す。)【選択図】図3
TELESCOPIC SHAFT FOR VEHICLE STEERING SHAFT AND ELECTRIC POWER STEERING DEVICE
車両ステアリングシャフト用伸縮軸及び電動パワーステアリング装置
2017-06-22
Patent
Electronic Resource
Japanese