PROBLEM TO BE SOLVED: To provide a worm reducer for an electric power steering comprising a mechanism which prevents enlargement of backlash caused by displacement of a worm accompanying change in a dimensional shape of a resin worm wheel due to change in atmospheric temperatures and abrasion of an engagement portion.SOLUTION: The worm reducer for an electric power steering comprises: a shaft end-side bearing 5 which can bear one end of a worm 2 and move the worm toward a worm wheel 3 in a shaft right-angle direction; a belt holding portion 9 provided integrally with a housing 1 in a radial direction of the shaft end-side bearing 5 and in a space 11 near the worm wheel 3; and an annular elastic belt 10 hung over an outer periphery of an outer wheel 6 of the shaft end-side bearing 5 and the belt holding portion 9, while being extended in a longitudinal direction, where the annular elastic belt 10 compresses with contractile force the worm 2 against the worm wheel 3 with predetermined pressure.SELECTED DRAWING: Figure 1
【課題】雰囲気温度の変化による樹脂製ウォームホイールの寸法形状変化や噛み合い部の摩耗に伴うウォームの変位によって生じるバックラッシュの拡大を防止する機構を備えた電動パワーステアリング用ウォーム減速機を提供する。【解決手段】ウォーム2の一端を支持し軸直角方向のウォームホイール3側に移動可能な軸端側軸受5と、軸端側軸受5の半径方向でかつウォームホイール3側の空間11内にハウジング1と一体的に設けられたベルト保持部9と、軸端側軸受5の外輪6の外周及びベルト保持部9に長さ方向に伸長された状態で掛けられた環状弾性ベルト10とを有し、環状弾性ベルト10が収縮力によりウォーム2をウォームホイール3に対して所定の力で加圧する。【選択図】図1
WORM REDUCER FOR ELECTRIC POWER STEERING
電動パワーステアリング用ウォーム減速機
2016-12-08
Patent
Electronic Resource
Japanese
METHOD FOR MANUFACTURING WORM REDUCER, WORM REDUCER, AND ELECTRIC POWER STEERING DEVICE
European Patent Office | 2018
|METHOD FOR MANUFACTURING WORM REDUCER, WORM REDUCER, AND ELECTRIC POWER STEERING SYSTEM
European Patent Office | 2018
|