TORQUE SENSOR AND DRIVE UNIT WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a torque sensor which avoids that a coolant to be supplied to a bearing reaches a distortion detection part, and in which an influence to be given to a detection result at the distortion detection part by heat to be generated at the bearing is reduced.

SOLUTION: A torque sensor has: a torque transmission shaft 2 which forms the shape of a hollow shaft and transmits torque while being accompanied by a twist between the driving side and the load side; a distortion detection part 4 which is attached to an inner peripheral surface 2a inside the torque transmission shaft 2 to detect distortion to be generated on the inner peripheral surface 2a by torque input; a fixation support part 6 which rotatably supports the torque transmission shaft 2 via a bearing 5; and a coolant supply path 7 which supplies a coolant to the bearing 5 through the inside of the torque transmission shaft 2 so as not to be connected to a hollow space SP1, and calculates size of the torque based on the detection result of the distortion detection part 4. The coolant supply path 7 has a thrust path 71 which distributes the coolant between an outer peripheral surface 2b and the inner peripheral surface 2a of the torque transmission shaft 2, and cools the distortion detection part 4 by the coolant which flows in the thrust path 71.

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