公开(公告)号：EP1911659A3

公开(公告)日：2010-01-20

申请号：EP07020077.9

申请日：2007-10-12

申请人： Hitachi, Ltd.

发明人： Ito, Takahiro ,  Yokoyama, Atsushi ,  Sasaki, Mitsuo

IPC分类号： B62D3/14 ,  B62D5/065 ,  B62D5/30 ,  B62D5/00

CPC分类号： B62D3/14 ,  B62D5/003 ,  B62D5/065 ,  B62D5/30

摘要： The invention relates to a steering system, comprising:
an input cylinder 13 having a first hydraulic chamber 15 and a second hydraulic chamber 16; a transmission mechanism 17, wherein a transmission efficiency for converting and transmitting a linear motion of the input cylinder 13 to a rotary motion of a steering wheel 11 is less than a transmission efficiency for converting and transmitting the rotary motion of the steering wheel 11 to the linear motion of the input cylinder 13; an output cylinder 23 connected to a steerable vehicle wheel 18 and having a third hydraulic chamber 25 and a fourth hydraulic chamber 26; a first hydraulic passage 27 for connecting the first hydraulic chamber 15 to the third hydraulic chamber 25; a second hydraulic passage 28 for connecting the second hydraulic chamber 16 to the fourth hydraulic chamber 26; a flow rate control mechanism 29 for exchanging hydraulic oil with: a first hydraulic circuit including the first and third hydraulic chambers 15, 25 and the first hydraulic passage 27; and a second hydraulic circuit including the second and fourth hydraulic chambers 16, 26 and the second hydraulic passage 28, in order to adjust a ratio of hydraulic oil quantities in the first and second hydraulic circuits; a steering actuator 21 for providing the steerable vehicle wheel with a steering power assistance; and
a controller 46 for cooperatively controlling the flow rate control mechanism and the steering actuator 21.

公开(公告)号：EP1911659B1

公开(公告)日：2011-03-09

申请号：EP07020077.9

申请日：2007-10-12

申请人： Hitachi, Ltd.

发明人： Ito, Takahiro ,  Yokoyama, Atsushi ,  Sasaki, Mitsuo

IPC分类号： B62D3/14 ,  B62D5/065 ,  B62D5/30 ,  B62D5/00

CPC分类号： B62D3/14 ,  B62D5/003 ,  B62D5/065 ,  B62D5/30

公开(公告)号：EP1911659A2

公开(公告)日：2008-04-16

申请号：EP07020077.9

申请日：2007-10-12

申请人： Hitachi, Ltd.

发明人： Ito, Takahiro ,  Yokoyama, Atsushi ,  Sasaki, Mitsuo

IPC分类号： B62D3/14 ,  B62D5/065 ,  B62D5/30 ,  B62D5/00

CPC分类号： B62D3/14 ,  B62D5/003 ,  B62D5/065 ,  B62D5/30

摘要： The invention relates to a steering system, comprising:
an input cylinder 13 having a first hydraulic chamber 15 and a second hydraulic chamber 16; a transmission mechanism 17, wherein a transmission efficiency for converting and transmitting a linear motion of the input cylinder 13 to a rotary motion of a steering wheel 11 is less than a transmission efficiency for converting and transmitting the rotary motion of the steering wheel 11 to the linear motion of the input cylinder 13; an output cylinder 23 connected to a steerable vehicle wheel 18 and having a third hydraulic chamber 25 and a fourth hydraulic chamber 26; a first hydraulic passage 27 for connecting the first hydraulic chamber 15 to the third hydraulic chamber 25; a second hydraulic passage 28 for connecting the second hydraulic chamber 16 to the fourth hydraulic chamber 26; a flow rate control mechanism 29 for exchanging hydraulic oil with: a first hydraulic circuit including the first and third hydraulic chambers 15, 25 and the first hydraulic passage 27; and a second hydraulic circuit including the second and fourth hydraulic chambers 16, 26 and the second hydraulic passage 28, in order to adjust a ratio of hydraulic oil quantities in the first and second hydraulic circuits; a steering actuator 21 for providing the steerable vehicle wheel with a steering power assistance; and
a controller 46 for cooperatively controlling the flow rate control mechanism and the steering actuator 21.

摘要翻译： 本发明涉及一种转向系统，包括：具有第一液压室15和第二液压室16的输入缸13; 传动机构17，其中用于将输入缸13的线性运动转换并传递至方向盘11的旋转运动的传递效率小于用于将方向盘11的旋转运动转换并传递至传递效率的传递效率 输入缸13的直线运动; 连接到可转向车轮18并具有第三液压室25和第四液压室26的输出缸23; 将第一液压室15连接到第三液压室25的第一液压通道27; 用于将第二液压室16连接到第四液压室26的第二液压通道28; 用于交换液压油的流量控制机构29与包括第一液压室15和第三液压室25以及第一液压通道27的第一液压回路; 以及包括第二和第四液压室16,26和第二液压通道28的第二液压回路，以便调节第一和第二液压回路中的液压油量的比例; 转向致动器21，用于向转向车轮提供转向助力; 以及用于协调地控制流量控制机构和转向致动器21的控制器46。

公开(公告)号：EP1657136A1

公开(公告)日：2006-05-17

申请号：EP04771420.9

申请日：2004-08-09

申请人： Hitachi, Ltd.

发明人： Sasaki, Mitsuo ,  Yokota, Tadaharu ,  Sakaki, Toshimitsu ,  Hiramoto, Michiya

IPC分类号： B62D5/07 ,  B62D6/00

CPC分类号： B62D5/0481 ,  B62D5/065 ,  B62D5/30

摘要： A steering system includes a hydraulic power cylinder 5 that assists a steering force of a rack-and-pinion mechanism 4, and a first hydraulic pressure supply mechanism 8 having a first trochoid pump 23 selectively supplying hydraulic pressure to two hydraulic pressure chambers 15a and 15b of the hydraulic power cylinder via first and second fluid passages 6 and 7, and a first electric motor 24 for the first trochoid pump. When the first hydraulic pressure supply mechanism becomes failed, a second hydraulic pressure supply mechanism 11 is operated responsively to a command signal from a control unit 14 to selectively supply hydraulic pressure via third and fourth fluid passages to either one of the hydraulic pressure chambers.
Thus, it is possible to positively apply a steering assist force by means of the second hydraulic pressure supply mechanism 11, thereby reducing a driver's operating force applied to a steering wheel.

摘要翻译： 转向系统包括辅助齿条齿轮机构4的转向力的液压动力缸5和具有选择性地向两个液压室15a和15b供给液压的第一次摆线泵23的第一液压供给机构8 通过第一和第二流体通道6和7的液压动力缸，以及用于第一次摆线泵的第一电动机24。 当第一液压供给机构发生故障时，响应于来自控制单元14的指令信号响应于第二液压供给机构11而选择性地通过第三和第四流体通路向液压室中的任一个供给液压。 因此，可以通过第二液压供给机构11积极地施加转向辅助力，从而降低驾驶员施加到方向盘的操作力。