US 12,304,020 B2
Rotational positioning device
Naoyuki Takahashi, Kikugawa (JP)
Assigned to SANKYO SEISAKUSHO CO., Tokyo (JP)
Appl. No. 17/773,472
Filed by SANKYO SEISAKUSHO CO., Tokyo (JP)
PCT Filed Aug. 21, 2020, PCT No. PCT/JP2020/031647
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2021/090551, PCT Pub. Date May 14, 2021.
Claims priority of application No. 2019-203234 (JP), filed on Nov. 8, 2019.
Prior Publication US 2022/0347807 A1, Nov. 3, 2022
Int. Cl. B23Q 1/52 (2006.01); F16C 19/14 (2006.01); F16M 11/08 (2006.01)
CPC B23Q 1/52 (2013.01) [F16C 19/14 (2013.01); F16M 11/08 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A rotational positioning device, comprising:
a housing;
a rotational member rotatable about a rotational member axial line, wherein a transmission mechanism is installed along a circumferential direction of the rotational member, at least a part of the rotational member being accommodated in the housing;
a second rotational member rotatable about a second rotational member axial line;
a sensor flange installed in the housing, wherein a circular rotational member hole is provided in the sensor flange; and
at least one sensor installed in the sensor flange,
wherein due to a contact between the transmission mechanism of the rotational member and the second rotational member, a rotation of one of the rotational member and the second rotational member enables a rotation of the other of the rotational member and the second rotational member;
wherein a graduated scale having a plurality of scale marks is integrally formed with the rotational member along the circumferential direction of the rotational member, the at least one sensor detects an angle change amount due to the rotation of the rotational member based on the plurality of scale marks, and the rotational member is positioned at a target angle position based on the angle change amount;
wherein at least a part of the rotational member is accommodated in the rotational member hole, whereby a central axis line of the rotational member hole is aligned with the rotational member axial line such that a position of the at least one sensor to the graduated scale is determined; and
wherein a first seal is provided within the rotational member hole between the sensor flange and the rotational member to isolate the at least one sensor from the transmission mechanism so as to prevent a lubricant from entering a space where the at least one sensor is installed.