| 摘要 |
The invention relates to elevator machinery (2) for a screw drive elevator, comprising a trapezoidal threaded screw (4) extending between the two ends of an elevator shaft, and a nut (6) mounted thereon and with a corresponding thread. Said nut is rotatably suspended in a housing (8) provided with a drive means, which supports an elevator car and a payload. The housing and the nut are displaceable by means of a disengaging device (28) relative to each other against the force of the load, between two limit positions along the centerline of the screw. The limit position thus corresponds to a rest position and an operating position of the machinery. The load is borne in the rest position by the screw (4) via the housing (8), a friction wear layer (26), a drive gear (14) and the nut (6). In the operating position, the disengaging device is energized, whereby the drive gear is unloaded and a thrust bearing (9) is loaded instead. The load is then transferred to the screw through the housing, the disengaging device, a bearing sleeve (12), the thrust bearing and the nut. |
