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公开(公告)号：US07575090B2
公开(公告)日：2009-08-18
申请号：US10553815
申请日：2004-04-16
IPC分类号： B62D5/04
CPC分类号： F16H1/16 , B62D5/0409 , F16C25/08 , F16C2361/61 , F16C2380/27 , F16H55/24 , F16H2057/0213 , H02K7/081
摘要： An electric power steering device provided with two belleville springs for suppressing the axial movement of a worm rotated by a steering-assisting electric motor and having shaft portions at its both end portions, and limiting members for limiting the deflection amounts of the two belleville springs. The limiting members are respectively disposed at portions along the outer circumferences of the shaft portions at both end portions of the worm, the respective inner circumferential portions of the two belleville springs are formed into flat portions, the outer circumferential portions thereof are respectively formed into tapered portions having a taper shape, and the limiting members are made contact with the flat portions, thereby limiting the deflection amounts of the tapered portions. Hence, the limiting members can be provided without increasing the size of the worm serving as a small gear.
摘要翻译： 一种电动助力转向装置，其具有两个用于抑制由转向辅助电动机旋转的蜗杆的轴向运动并在其两个端部具有轴部的椭圆形弹簧，以及用于限制两个贝氏弹簧的挠曲量的限制构件。 限位构件分别设置在蜗杆的两端部处的轴部的外周的部分，两个扁平弹簧的内周部形成为平坦部，其外周部分别形成为锥形 具有锥形的部分，并且限制构件与平坦部分接触，从而限制锥形部分的偏转量。 因此，可以提供限制构件而不增加用作小齿轮的蜗杆的尺寸。
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公开(公告)号：US20070102228A1
公开(公告)日：2007-05-10
申请号：US10553815
申请日：2004-04-16
IPC分类号： B62D5/04
CPC分类号： F16H1/16 , B62D5/0409 , F16C25/08 , F16C2361/61 , F16C2380/27 , F16H55/24 , F16H2057/0213 , H02K7/081
摘要： An electric power steering device provided with two belleville springs for suppressing the axial movement of a worm rotated by a steering-assisting electric motor and having shaft portions at its both end portions, and limiting members for limiting the deflection amounts of the two belleville springs. The limiting members are respectively disposed at portions along the outer circumferences of the shaft portions at both end portions of the worm, the respective inner circumferential portions of the two belleville springs are formed into flat portions, the outer circumferential portions thereof are respectively formed into tapered portions having a taper shape, and the limiting members are made contact with the flat portions, thereby limiting the deflection amounts of the tapered portions. Hence, the limiting members can be provided without increasing the size of the worm serving as a small gear.
摘要翻译： 一种电动助力转向装置，其具有两个用于抑制由转向辅助电动机旋转的蜗杆的轴向运动并在其两个端部具有轴部的椭圆形弹簧，以及用于限制两个贝氏弹簧的挠曲量的限制构件。 限位构件分别设置在蜗杆的两端部处的轴部的外周的部分，两个扁平弹簧的内周部形成为平坦部，其外周部分别形成为锥形 具有锥形的部分，并且限制构件与平坦部分接触，从而限制锥形部分的偏转量。 因此，可以提供限制构件而不增加用作小齿轮的蜗杆的尺寸。
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公开(公告)号：US07240762B2
公开(公告)日：2007-07-10
申请号：US10721751
申请日：2003-11-26
申请人： Akihiko Shiina , Noritake Okawa , Masayoshi Sakuda
发明人： Akihiko Shiina , Noritake Okawa , Masayoshi Sakuda
CPC分类号： F16H25/24 , B62D5/0409 , F16H57/12 , Y10T74/19623 , Y10T74/19828 , Y10T74/19898 , Y10T74/19953
摘要： A gearing radius of a worm wheel is set corresponding to a neighborhood region of a steering neutral position, in such a way as to be relatively large. Thus, backlash is made to be relatively small. This prevents noises from being produced when an automobile travels straight on a bad road. Conversely, the backlash is set corresponding to most of regions of steering angles, which are within the remaining region thereof, in such a manner as to be relatively large. Thus, increase in resistance torque is suppressed. This is realized by a simple configuration in which a bias portion is provided in a part of the profile of teeth. In a case where power is transmitted from an electric motor by a worm shaft and a worm wheel during a steering operation, noises are hard to be produced even when the automobile travels on a bad road.
摘要翻译： 蜗轮的齿轮半径被设定为对应于转向中立位置的邻域，以相对较大的方式。 因此，齿隙相对较小。 这样可以防止汽车在恶劣的道路上直线行驶时产生噪音。 相反，对应于处于其剩余区域内的转向角的大部分区域，以相对较大的方式设定齿隙。 因此，抑制了电阻转矩的增加。 这通过简单的构造来实现，其中在牙齿轮廓的一部分中设置偏置部分。 在转向操作期间通过蜗杆轴和蜗轮从电动机传递动力的情况下，即使在汽车在恶劣的道路上行驶时也难以产生噪声。
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