JP6552731B2 - Bearing device for elevator hoisting machine - Google Patents

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. There is. 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 end of the shaft. End covers 12 are attached to both end faces of the housing and bearing stand bosses. The end cover 12 fixes the bearing outer ring. The motor rotor 13 is fitted to the shaft. Further, 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 acts on the bearing because of the structure in which bearings support the both ends of the rotary shaft fitted with the sheave. 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 against this, it is conceivable to adopt the above-described bearing device to a hoisting machine. However, the conventional bearing device has high rigidity in the radial direction (vertical direction) as well as in the axial direction (horizontal direction) because the elastic body has a single-layer structure, and the axial load generated in the bearing can be suppressed The effect was small.
Also, as mentioned above, the ropes are fastened on the car side and the omori side via the sheaves and the diverter, and the ropes diverted by the diverter are at an angle when the distance between the car and the suspension core between the omori increases. Approaches horizontal. When the rope approaches horizontal and the horizontal component force of the load acting on the sheave by the rope tension increases, the anti-vibration 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. Moreover, when the vibration-proof rubber which supports a winding machine is arrange | positioned on a machine-bed upper surface, it is necessary to level-adjust using a liner so that a winding machine may not be inclined, and an operation was time-consuming.

  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, the bearing is supported by the elastic body to support a rotation 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 elevator hoist 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. 1 is a block diagram of a bearing device on the bearing base side according to a first embodiment of the present invention. FIG. 2 is a schematic view of the elastic body before axial deflection according to Embodiment 1 of the present invention. FIG. 3 is a schematic view of the elastic body according to the first embodiment of the present invention after bending in the axial direction. 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. Further, with respect to each of the three elastic members 116a, 116b and 116c, a gap having a dimension in the circumferential direction is provided between the elastic members adjacent in the circumferential direction, whereby each of the elastic members 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 stand, a bearing disposed above the bearing stand, and an elastic body provided between the bearing stand 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, and the bearing stand and the bearing are splines. The splines are fitted and extend in the direction in which the rotating shaft 110 extends, that is, extend in the axial direction.

  Further, a jack bolt 118 is provided at the lower portion of the inner end cover (the lower portion of the end cover attached to the inner end surface of the bearing boss), that is, the lower 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. The longer the distance between the car and the slat, the more the angle of the load acting on the sheave will be, since the rope diverted by the diverter will be pulled horizontally. 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. Further, since it is possible to support with an elastic body having a spring constant suitable for the size of the radial load, it is possible to cope with various elevator specifications only with this bearing device, and the number of parts can be reduced.

  Although a spline connection is proposed as a method of fixing the elastic body at an arbitrary angle, as shown in FIG. . 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 is provided with a jack bolt 118 at the lower end cover inside the bearing stand, and has a structure capable of supporting the rotating shaft 110 by the jack bolt 118. After the rotary shaft is supported by the jack bolt and the load is removed, as shown in FIG. 7, by removing the elastic body, a space can be secured between the bearing stand and the bearing. A jig for pulling out a pulley can be installed in the bearing in this space, and the bearing can be pulled out without removing a heavy bearing stand, and bearing replacement work becomes easy.

  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.

  While 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 concept and teaching of the present invention. It is self-explanatory.

  109 bearing base, 110 rotating shaft, 111 bearing, 112 end cover, 106 elastic body, 116a, 116b, 116c elastic member, 117a internal spline tooth, 117b external spline tooth, 118 jack bolt.

Claims (3)

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. An end cover for fixing the elastic body is provided with a jack bolt for supporting the rotation shaft,
A bearing device for an elevator hoist according to claim 1 or 2.

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