| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a drive unit having a nut whirl-stop mechanism by which a nut for regulating the movement of main bearings to the axial direction is not loosened so much.SOLUTION: A drive unit 1 comprises a hydraulic motor 4 accommodated in a case 2, a reduction gear 5 connected to an output shaft 6 of the hydraulic motor 4, and a ring gear 3 which is rotatably attached to the case 2 via main bearings 26a to 26b, and accommodates the reduction gear 5. A fixed nut 27 for regulating the movement of the main being 26b to the axial direction is attached to an external periphery of the case 2, a pin hole 2b into which a pin 28 engaged with the fixed nut 27 is inserted is formed at an end face of case 2 at the reduction gear 5 side, and a plurality of protrusions 28a are formed at an external peripheral face of the pin 28. The pin 28 is fixed by the protrusions 28a in the circumferential direction of the pin hole 2b with respect to the pin hole 2b, and the fixed nut 27 is prevented from tuning.</p> |
