To provide a rack shaft and a steering gear unit that make it easy to secure durability.SOLUTION: A rack portion 15 includes: a plurality of rack teeth 17 provided at one position in a circumferential direction of an outer peripheral surface; to-be-pressed surfaces 19a, 19b provided on a portion of the outer peripheral surface and configured to be brought into contact with a rack guide in use, the portion being positioned substantially opposite to a portion where the plurality of rack teeth 17 are provided in a radial direction of the outer peripheral surface; an oil holding recessed portion 20 provided in a portion of the outer peripheral surface in which the plurality of rack teeth 17 are provided and which is deviated from the to-be-pressed surfaces 19a, 19b in the circumferential direction, the portion being positioned above the portion in which the plurality of rack teeth 17 are provided and/or the to-be-pressed surfaces 19a, 19b in use. At least a part of the oil holding recessed portion 20 is open to a portion deviated from a portion facing the rack guide in the radial direction.SELECTED DRAWING: Figure 3
【課題】耐久性を確保しやすいラック軸、およびステアリングギヤユニットを提供する。【解決手段】ラック部15は、外周面の円周方向1箇所位置に設けられた複数のラック歯17と、外周面のうち径方向に関して複数のラック歯17が設けられた部分と略反対側に位置する部分に設けられ、かつ、使用時にラックガイドと接触する被押圧面19a、19bと、外周面のうち、複数のラック歯17が設けられた部分および被押圧面19a、19bから円周方向に外れた部分であって、使用時に複数のラック歯17が設けられた部分および/または被押圧面19a、19bよりも上側に位置する部分に設けられた保油凹部20とを有する。保油凹部20は、少なくとも一部がラックガイドと径方向に対向する部分から外れた部分に開口している。【選択図】図3
RACK SHAFT AND STEERING GEAR UNIT
ラック軸およびステアリングギヤユニット
2025-02-21
Patent
Electronic Resource
Japanese
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