| 摘要 |
A power transmission shaft in a steering unit that shortens in axial direction born by impact load over a specified impact load and thereby absorbs impact, which comprises a hollow shaft having an engaging concave portion on the inner circumference thereof, and is characterized by that an insertion shaft having an engaging convex portion on the outer circumference thereof that engages with the above engaging concave portion of the hollow shaft when inserted into the hollow shaft, and the hollow shaft and the insertion shaft are connected with each other so that they can transmit power in the circumferential direction, and they are connected so that they are displaceable in the axial direction, and a concave portion to form a depressed portion is arranged at the portion of the engaging convex portion on the outer circumference of the above insertion shaft, and an inward depressed portion processed by use of the concave portion to form the depressed portion of the above insertion shaft at the portion where the engaging concave portion of the abovementioned hollow shaft exists, and the engaging convex portion is engagedly inserted into the depressed portion of the hollow shaft, and thereby the above power transmission shaft enables to eliminate much of wastes in production process and assembly process and thereby enhance cost reduction, and further realizes sufficient impact absorption. <IMAGE> |
