JP-7855548-B2 - Hoisting machines and elevators

JP7855548B2JP 7855548 B2JP7855548 B2JP 7855548B2JP-7855548-B2

Inventors

山本洋嗣

Assignees

株式会社日立製作所

Dates

Publication Date: 20260508
Application Date: 20230509

Claims (7)

A hoisting machine comprising a sheave around which a rope is wound, and a drum having a cylindrical portion into which the sheave is fixed in a fitted state, The drum has a plurality of first screw holes formed on a first circumference located outside the outer circumferential surface of the cylindrical portion into which the sheave is fitted, and a plurality of second screw holes formed on a second circumference located inside the outer circumferential surface of the cylindrical portion and on the protruding end surface of the cylindrical portion. The sheave is fixed to the drum by a bolt that engages with the first screw hole or the second screw hole in the hoisting machine.
The hoisting machine according to claim 1, wherein the first screw hole and the second screw hole are formed at the same position relative to each other in the circumferential direction.
The drum has a plurality of ribs arranged radially, The hoisting machine according to claim 2, wherein the first screw hole and the second screw hole are formed on the extension of the rib portion.
The sheave is fixed to the drum by a bolt that engages with the first screw hole, The hoisting machine according to claim 1, wherein the thickness dimension of the sheave is the same as the protruding dimension of the cylindrical portion.
The hoisting machine according to claim 1, wherein the sheave has a flange that covers the protruding end surface of the cylindrical portion, and a bolt insertion hole is provided in the flange, and the sheave is fixed to the drum by a bolt that engages with the second screw hole through the bolt insertion hole.
The hoisting machine according to claim 5, wherein the bolt insertion hole has a counterbore portion for accommodating the head of the bolt.
An elevator comprising a hoisting machine for winding up a rope, and a car and counterweight that move up and down by the drive of the hoisting machine, The hoisting machine comprises a sheave around which the rope is wound, and a drum having a cylindrical portion into which the sheave is fixed in a fitted state. The drum has a plurality of first screw holes formed on a first circumference located outside the outer circumferential surface of the cylindrical portion into which the sheave is fitted, and a plurality of second screw holes formed on a second circumference located inside the outer circumferential surface of the cylindrical portion and on the protruding end surface of the cylindrical portion. The sheave is fixed to the drum by a bolt that engages with the first screw hole or the second screw hole in the elevator.

Description

This invention relates to a hoisting machine and an elevator. An elevator hoisting machine comprises a housing with a fixed main shaft, a drum rotatably mounted on the main shaft, and a sheave bolted to the drum. A rope is wound around the sheave of the hoisting machine according to predetermined specifications (hereinafter referred to as "rope specifications"). The rope specification is determined by the diameter and number of ropes wound around the sheave. Therefore, for example, if a rope with a diameter of 10 mm and four ropes is considered the first rope specification, and a rope with a diameter of 8 mm and six ropes is considered the second rope specification, the sheave thickness suitable for the second rope specification will be greater than that suitable for the first rope specification. The main reason for this is that increasing the number of ropes increases the number of grooves formed on the outer surface of the sheave. On the other hand, designing and manufacturing each component of the hoisting machine specifically for each rope specification would complicate parts management and lead to increased costs. Therefore, conventionally, even for rope specifications requiring a smaller sheave thickness, the sheave thickness is set to match that of rope specifications requiring a larger sheave thickness, thereby standardizing components other than the sheave. Specifically, for example, the sheave thickness for the first rope specification is set to the same dimension as the sheave thickness suitable for the second rope specification, thereby standardizing components other than the sheave. Regarding elevator hoisting machines, for example, the technology described in Patent Document 1 is known. Japanese Patent Publication No. 2019-11140 This is a schematic diagram showing an example of the configuration of an elevator according to the embodiment.This is a front view showing the configuration of a hoisting machine according to the first embodiment.This is a cross-sectional view taken along line III-III in Figure 2.This figure shows the hoisting machine with the sheave removed.Figure 4 is a cross-sectional view of the hoisting machine taken along line V-V.This is a front view showing the configuration of the hoisting machine according to the second embodiment.Figure 6 is a cross-sectional view of the hoisting machine along line VII-VII. Embodiments of the present invention will be described in detail below with reference to the drawings. In this specification and the drawings, elements having substantially the same function or configuration are denoted by the same reference numerals, and redundant descriptions are omitted. Figure 1 is a schematic diagram showing an example of the configuration of an elevator according to the embodiment. As shown in Figure 1, the elevator 10 is installed in the hoistway 11 of a building structure such as a building. The elevator 10 comprises a hoisting machine 12, a rope 13, a car 14, a counterweight 15, and a pulley 16. The hoisting machine 12 is a device that winds up the rope 13 to raise and lower the elevator car 14, and is equipped with a sheave 17. The hoisting machine 12 is installed in a machine room 18 located at the top of the elevator shaft 11. The elevator car 14 moves up and down the elevator shaft 11, guided by a car guide rail (not shown). A car pulley 19 is positioned above the elevator car 14. The counterweight 15 moves up and down the elevator shaft 11, guided by a weight guide rail (not shown). A weight pulley 20 is positioned above the counterweight 15. The rope 13 is wound around the cage pulley 19, the sheave 17 of the hoisting machine 12, the pulley 16, and the weight pulley 20, respectively. In the elevator 10 configured as described above, the hoisting machine 12 drives the sheave 17, and the rotation of the sheave 17 winds up the rope 13, causing the elevator car 14 and the counterweight 15 to move up and down in opposite directions. Furthermore, the configuration of the elevator 10 is not limited to the configuration shown in Figure 1; various configurations can be adopted. <First Embodiment> Figure 2 is a front view showing the configuration of a hoisting machine according to the first embodiment, and Figure 3 is a cross-sectional view taken along line III-III in Figure 2. As shown in Figures 2 and 3, in addition to the sheave 17 described above, the hoisting machine 12 includes a hollow main shaft 25, a housing 26 to which the main shaft 25 is fixed, a drum 28 rotatably supported on the main shaft 25 via a bearing 27, a brake 29 for braking the rotation of the drum 28, a stator 30, a magnet 31, an encoder 32, and a rotation transmission member 33. As shown in Figure 3, the housing 26 has a main body 34 and leg portions 35. The main body 34 integrally includes a part of the drum 28, a housing portion 36 for housing the stator 30, etc., and a boss portion 37 to which the main shaft 25 is attached. The housing portion 36 is formed on the outer c