JPWO2017212576A1 - Bearing device for hoisting machine for elevator - Google Patents

Abstract

A bearing device for an elevator hoisting machine includes a bearing base, a bearing disposed above the bearing base, and an elastic body provided between the bearing base and the bearing, and the bearing is supported by the elastic body. The elastic body includes a plurality of elastic members having different spring constants, and the plurality of elastic members are arranged side by side in the circumferential direction of the bearing.

Description

  The present invention relates to a bearing device for an elevator hoist.

  Hereinafter, in order to help understanding of the description, a traction type elevator will be described based on the description examples of FIGS. 8 and 9. In FIG. 8, a sheave 2 of the hoist 1 is provided in the machine room above the hoistway. A rope 3 is hung on the sheave 2, one end (the side indicated by reference numeral 3 a) of the rope 3 is fixed to the cage, and the other end (the side indicated by reference numeral 3 b) is fixed to the balancing weight. Yes. The balance weight side 3 b of the rope is warped by the deflector 4. Between the bed 5 for fixing the hoisting machine and the machine base 6, a vibration isolating rubber 7 for preventing transmission of vibration from the hoisting machine is provided.

  FIG. 9 shows a cross section of the hoist. A housing 8 is fixed on the base 15. A bearing base 9 is fixed to the same base 15. A shaft 10 is rotatably attached to the housing and the bearing stand. A bearing 11 is fitted to each of both ends of the shaft. End covers 12 are attached to both end faces of the bosses of the housing and the bearing stand. The end cover 12 fixes the bearing outer ring. A motor rotor 13 is fitted on the shaft. A motor stator 14 is fixed to the housing.

  A conventional structure related to the bearing device will be described. For example, Patent Document 1 discloses a conventional bearing device. As shown in FIG. 10, the conventional bearing device includes an elastic body 25 between the bearing base 21 and the bearing 23. The elastic body 25 has a structure that supports the bearing outer ring 27 and suppresses vibration generated from the bearing 23.

Japanese Utility Model Publication No. 60-161718 (page 3, FIG. 1)

  In the elevator hoisting machine, a radial load corresponding to the rope tension is applied to the bearing because the bearing supports both ends of the rotating shaft with which the sheave is fitted. The bearing generates heat by rotating while receiving the radial load, and the rotating shaft generates thermal elongation due to heat from the bearing. The inner ring of the bearing moves together with the heat-extended shaft. However, since the outer ring is fixed by the end cover, the phase between the outer ring and the inner ring is shifted, the gap inside the bearing is eliminated, and an axial load is generated. Since the bearing life is shortened by the generation of this axial load, it was necessary to adopt a bearing with a large rated load.

As a countermeasure, it is conceivable to employ the above-described bearing device in a hoisting machine. However, the conventional bearing device has a high rigidity in both the radial direction (vertical direction) and the axial direction (horizontal direction) because the elastic body has a single-layer structure, which is effective in suppressing the axial load generated in the bearing. The effect was small.
In addition, as described above, the rope is fixed on the car side and the weight side via the sheave and the sled wheel. Approaches horizontal. When the rope approaches horizontal and the horizontal component of the load acting on the sheave due to the rope tension increases, the vibration-proof rubber reaction force on the weight side increases. As a result, the required number of weight-side anti-vibration rubbers increases, which increases the cost. Further, when the anti-vibration rubber for supporting the hoisting machine is disposed on the upper surface of the machine base, it is necessary to make a horizontal adjustment using a liner so that the hoisting machine does not tilt, which takes time and effort.

  The present invention has been made in view of the above, and does not require an anti-vibration rubber that reduces the axial load on the bearing and suppresses the vibration of the elevator hoisting machine, and the lifting load of the elevator and the distance between the suspension cores. The purpose of the present invention is to provide a bearing device for an elevator hoisting machine that can be handled with the same parts even if the specifications change.

  In order to achieve the above-described object, a bearing device for an elevator hoist according to the present invention is provided between a bearing base, a bearing disposed above the bearing base, and the bearing base and the bearing. An elastic body, and the bearing is supported by the elastic body to support the rotating shaft, and the elastic body includes a plurality of elastic members having different spring constants, and the plurality of elastic members are They are arranged side by side in the circumferential direction of the bearing.

  According to the present invention, an anti-vibration rubber that reduces the axial load on the bearing, suppresses the vibration of the elevator hoisting machine is unnecessary, and the specifications such as the lifting load of the elevator and the distance between the suspension cores change, A bearing device for an elevator hoisting machine that can be handled by the same component can be provided.

It is a block diagram of the bearing apparatus by the side of a bearing stand in Embodiment 1 of this invention. It is a schematic diagram before the bending of the elastic body in the axial direction in Embodiment 1 of this invention. It is the schematic diagram after the bending of the axial direction of the elastic body in Embodiment 1 of this invention. It is a front view of the bearing apparatus in Embodiment 1 of this invention. It is a schematic diagram of the load which acts on a sheave. It is a front view of the bearing apparatus which marked the spline tooth of the elastic body and the bearing stand in Embodiment 1 of this invention. It is sectional drawing of the bearing stand which removed the elastic body in Embodiment 1 of this invention. It is the schematic which shows the elevator vibration proof structure as an explanatory example. It is sectional drawing of the hoist for elevators as an example of an explanation. It is a block diagram of a conventional bearing device.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a bearing device on the bearing stand side according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram of the elastic body according to Embodiment 1 of the present invention before bending in the axial direction. FIG. 3 is a schematic diagram after the elastic body is bent in the axial direction according to Embodiment 1 of the present invention. FIG. 4 is a front view of the bearing device according to the first embodiment of the present invention. FIG. 5 is a schematic view of a load acting on the sheave. FIG. 6 is a front view of the bearing device in which marks are applied to the spline teeth of the elastic body and the bearing base in the first embodiment of the present invention. FIG. 7 is a cross-sectional view of the bearing stand from which the elastic body according to Embodiment 1 of the present invention is removed.

  As shown in FIG. 1, an elastic body 116 is disposed between the bearing outer ring 111 a of the bearing 111 and the bearing base 109. An elastic body supports a bearing on which a radial load or an axial load is applied. The elastic body has an outer diameter end portion fixed in an axial direction by inner and outer end covers 112.

  This elastic body has high rigidity in the radial direction and low rigidity in the axial direction A, such as the laminated rubber shown in FIGS. 2 and 3 (a multilayer block in which rubber plates are laminated via steel plates). It is characterized by having.

  As shown in FIG. 4, the elastic body 116 includes a plurality of elastic members. As a specific example, in the first embodiment, the elastic body 116 includes three elastic members 116a, 116b, and 116c. The elastic members 116a, 116b, 116c are arranged side by side in the circumferential direction of the bearing. The spring constants of the elastic members 116a, 116b, and 116c are different from each other. In addition, with respect to each of the three elastic members 116a, 116b, and 116c, a gap having a circumferential dimension is provided between the elastic members adjacent in the circumferential direction. It does not come into contact with other adjacent elastic members in the circumferential direction.

  Further, this bearing device has a feature that an elastic body can be attached at an arbitrary angle, for example, spline coupling in which a spline inner tooth 117a is provided on the inner diameter of the bearing stand and a spline outer tooth 117b is provided on the outer periphery of the elastic body. That is, the bearing device includes a bearing base, a bearing disposed above the bearing base, and an elastic body provided between the bearing base and the bearing, and the bearing is supported by the elastic body and the rotating shaft 110. The elastic body includes a plurality of elastic members having different spring constants, and the plurality of elastic members are arranged side by side in the circumferential direction of the bearing. The splines are fitted and extend in the direction in which the rotating shaft 110 extends, that is, extend in the axial direction.

  Further, jack bolts 118 are provided at the lower part of the inner end cover (the lower part of the end cover attached to the inner end face of the bearing boss), that is, the lower part of the end cover on the sheave side. It has a structure that can support. The outline of the overall configuration of the bearing device according to the present embodiment is the same as that shown in FIG. 9 except for the configuration of the elastic body and the structure related to the spline.

  In the bearing device having such a structure, when the heat generated from the bearing causes thermal elongation of the rotating shaft and an axial load is generated on the bearing supported via the elastic body, the elastic body is bent in the axial direction. Axial load applied to the bearing is reduced.

  The elastic body provided between the bearing stand and the bearing also has an effect of suppressing vibration from the rotating shaft. Therefore, the vibration-proof rubber arranged on the lower surface of the conventional hoisting machine for the same application is unnecessary.

  FIG. 5 is a diagram showing the load acting on the sheave by the rope tension. As the distance between the suspension core and the car and the weight is longer, the rope deflected by the deflecting wheel is pulled horizontally, and the angle of the load acting on the sheave becomes larger. The magnitude of the load is proportional to the suspension load acting on the rope. The load applied to the sheave acts as a radial load on the bearing.

  The bearing is supported by a roller (ball) of about 1/3 of the radial load in terms of performance. This bearing device has a structure in which a plurality of elastic members having different spring constants are arranged in the circumferential direction and can be attached at an arbitrary angle. Since the three elastic bodies arranged in the circumferential direction have different spring constants, it is ideal to support the radial load with one elastic body in order to have the planned vibration isolation performance (the radial load is adjacent to the elastic body). When acting between two matching elastic bodies, the bearing will not be parallel to the axial direction due to the difference in the amount of deflection and will not move). Therefore, the elastic body that supports the radial load can be supported at the center of the elastic body on the circular arc that is the optimum position with respect to the radial load having an angle. In addition, since it can be supported by an elastic body having a spring constant suitable for the radial load, it is possible to deal with various elevator specifications only with this bearing device, and the number of parts can be reduced.

  Spline coupling has been proposed as a method of fixing the elastic body at an arbitrary angle. However, as shown in FIG. 6, marks indicating the distance between the cage weight suspension cores may be put on the inner and outer teeth of the spline. . As described above, it is ideal that this bearing device supports the radial load at the center of the elastic body. However, the distance between the suspension cores and the suspension load are different for each property. It took time and effort. After confirming the optimal angle of the elastic body at the time of designing for each property, the mark indicating the mounting position is sent to the assembly department, so that the installation at the optimal angle from the distance between the suspension cores becomes clear when assembling the hoisting machine. Work efficiency is improved.

  In the conventional elevator hoisting machine, when replacing the bearing, it is necessary to jack up the sheave from below the sheave to remove the load applied to the bearing and then to remove the bearing stand. On the other hand, the bearing device of the present embodiment has a structure in which a jack bolt 118 is provided at the bottom of the end cover on the inner side of the bearing stand, and the rotating shaft 110 can be supported by the jack bolt 118. After removing the load by supporting the rotating shaft with jack bolts, a space can be secured between the bearing stand and the bearing by removing the elastic body as shown in FIG. In this space, a jig such as a pulley can be installed on the bearing, and the bearing can be pulled out without removing a heavy bearing base, thereby facilitating the bearing replacement operation.

  As described above, according to the present embodiment, no axial load is applied to the bearing, no anti-vibration rubber for suppressing the vibration of the elevator hoisting machine is required, and the lifting load of the elevator and the distance between the suspension cores are not required. Thus, it is possible to provide a bearing device for an elevator hoisting machine that can be handled with the same parts even if the specifications change.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

  109 Bearing stand, 110 Rotating shaft, 111 Bearing, 112 End cover, 106 Elastic body, 116a, 116b, 116c Elastic member, 117a Spline inner teeth, 117b Spline outer teeth, 118 Jack bolts.

Claims (3)

A bearing stand;
A bearing disposed above the bearing stand;
An elastic body provided between the bearing stand and the bearing;
The bearing is supported by the elastic body to support the rotating shaft,
The elastic body includes a plurality of elastic members having different spring constants,
The plurality of elastic members are arranged side by side in the circumferential direction of the bearing,
Bearing device for elevator hoisting machine. The bearing stand and the bearing are spline-fitted,
A bearing device for an elevator hoist according to claim 1. The end cover for fixing the elastic body is provided with a jack bolt that supports the rotating shaft,
A bearing device for an elevator hoist according to claim 1 or 2.

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