公开(公告)号：US20130118289A1

公开(公告)日：2013-05-16

申请号：US13675529

申请日：2012-11-13

Applicant: JTEKT Corporation

Inventor： Kosuke YAMANAKA

IPC: B62D1/16

CPC classification number: B62D1/16 ,  B62D3/12 ,  B62D5/001 ,  B62D5/0427 ,  B62D5/0448 ,  B66F9/07568 ,  F16H55/26

Abstract: A vehicle steering system includes a steered shaft, and stoppers which restrict an amount of movement of the steered shaft in an axial direction. The steered shaft has first outer peripheral faces, second outer peripheral faces, and annular stepped portions. Each stepped portion includes a contact portion that faces a corresponding one of the stoppers in the axial direction, a first corner portion that has a concave curved sectional shape and connects the first outer peripheral face to an inner end of the contact portion, and a second corner portion that has a concave curved sectional shape with a larger curvature radius than that of the first corner portion, and connects the first outer peripheral face to the second outer peripheral face, at a position in front of or behind a central axis of the steered shaft.

Abstract translation: 车辆转向系统包括转向轴和止动件，其限制转向轴在轴向方向上的移动量。 转向轴具有第一外周面，第二外周面和环状台阶部。 每个台阶部包括在轴向方向上面对相应的止动件的接触部，具有凹曲面截面形状并将第一外周面与接触部的内端连接的第一角部， 角部，其具有比第一角部大的曲率半径的凹曲面截面形状，并且将第一外周面与第二外周面连接，在转向的中心轴的前方或后方的位置 轴。

公开(公告)号：US20130340563A1

公开(公告)日：2013-12-26

申请号：US13920403

申请日：2013-06-18

Applicant: JTEKT CORPORATION

Inventor： Kosuke YAMANAKA ,  Masakazu FURUYOSHI ,  Toshiaki OYA

IPC: G05G5/08

CPC classification number: G05G5/08 ,  B62D7/148 ,  Y10T74/20672

Abstract: A rear wheel steering system includes a rack shaft, a neutral position locking apparatus that restricts the movement of the rack shaft in a rack axis direction, and a pin-driving device that drives a restriction pin. The neutral position locking apparatus has the restriction pin and a pin-receiving portion formed in the rack shaft. The restriction pin has a first pin-sidewall portion slanted with respect to a pin axis and a second pin-sidewall portion parallel to the pin axis. The pin-receiving portion has a first shaft-sidewall portion that contacts the first pin-sidewall portion when the position of the rack shaft in the rack axis direction is at a neutral position, and a second shaft-sidewall portion that contacts the second pin-sidewall portion when the position of the rack shaft in the rack axis direction is at a restriction position different from the neutral position.

Abstract translation: 后轮转向系统包括齿条轴，限制齿条轴在齿条轴线方向上的移动的中立位置锁定装置和驱动限制销的销钉驱动装置。 中立位置锁定装置具有限制销和形成在齿条轴中的销接收部分。 限制销具有相对于销轴倾斜的第一销侧壁部分和平行于销轴线的第二销侧壁部分。 销接收部具有当齿条轴在齿条轴方向的位置处于中立位置时与第一销侧壁部接触的第一轴侧壁部，以及与第二销侧壁部接触的第二轴侧壁部 当齿条轴在齿条轴线方向上的位置处于与中立位置不同的限制位置时的侧壁部分。

公开(公告)号：US20150209921A1

公开(公告)日：2015-07-30

申请号：US14679782

申请日：2015-04-06

Applicant: JTEKT CORPORATION

Inventor： Kosuke YAMANAKA

IPC: B23P19/04 ,  B62D5/00

CPC classification number: B23P19/04 ,  B62D5/001 ,  B62D5/0427 ,  B62D5/0448 ,  Y10T29/49945

Abstract: Provided is a vehicle steering system that is able to restrict a travel amount of a steered shaft in a housing, that is small and that has an excellent strength. The vehicle steering system is a steer-by-wire vehicle steering system that converts rotative power of electric motors into a movement of a steered shaft in an axial direction via a ball screw mechanism. One of contact portions at respective ends of a screw shaft at an intermediate part of the steered shaft passes through a rotor based on a moving direction of the steered shaft so as to contact a corresponding one of the corresponding stoppers thereby restricting a travel amount of the steered shaft. The stoppers are made of a material different from that of the housing and having a high strength.

Abstract translation: 提供一种车辆转向系统，其能够限制壳体中的转向轴的行驶量，其小且具有优异的强度。 车辆转向系统是一种线控转向系统，其通过滚珠丝杠机构将电动机的旋转动力转换为轴向的转向轴的运动。 在转向轴的中间部分处的螺杆轴的相应端的接触部分之一基于转向轴的移动方向通过转子，以便与对应的一个相应止动件接触，从而限制转向轴的行进量 转向轴。 止动件由与壳体不同的材料制成并具有高强度。

公开(公告)号：US20140144263A1

公开(公告)日：2014-05-29

申请号：US14085190

申请日：2013-11-20

Applicant: JTEKT CORPORATION

Inventor： Kazuya YOSHIOKA ,  Kosuke YAMANAKA

IPC: B62D3/08 ,  F16H25/22

CPC classification number: F16H25/2204 ,  B62D5/0448 ,  F16H25/2021 ,  F16H2025/2445 ,  Y10T74/18576 ,  Y10T74/19744

Abstract: There are provided a ball screw that makes it possible to prevent a situation where a large load is applied to a part of a plurality of balls, and an electric power steering system including the ball screw. The ball nut is a component that surrounds a part of the male thread groove, and has a nut inner surface and a female thread groove. The female thread groove is formed in the nut inner surface, and forms a part of the rolling path. A female thread diameter varies according to a position in an axial direction of the ball nut. The female thread diameter is larger at each of axially ends of the ball nut than at an axially intermediate portion of the ball nut, and the female thread diameter is larger at one of the axially ends than at the other of the axially ends.

Abstract translation: 提供了一种能够防止对多个球的一部分施加大负荷的情况的滚珠丝杠和包括滚珠丝杠的电动助力转向系统。 滚珠螺母是围绕阳螺纹槽的一部分的部件，具有螺母内表面和内螺纹槽。 内螺纹槽形成在螺母内表面中，形成轧制路径的一部分。 内螺纹直径根据滚珠螺母的轴向位置而变化。 在滚珠螺母的每个轴向端处的内螺纹直径大于在滚珠螺母的轴向中间部分处的内螺纹直径，并且内螺纹直径在轴向端部中的一个处比在另一个轴向端部处更大。