JP2001280412A - Dynamic vibration absorber for rotor and elevator using this absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the dynamic vibration absorber that can easily install a rotor, quantitatively and easily design, and easily adjust. SOLUTION: A pendulum 10 comprises a rod 13 that is oscillatingly and universally supported at one-rod end on the side part 4 of a rotor 1, and a weight 14 attached to the rod 13. Besides, an elastic bodies 16 press the side part of the rod 13 to turn the rod 13 toward the radial direction of the rotor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic vibration absorbing device for a rotating body, in which a pendulum is attached to a side of the rotating body to suppress vibration.
This is an invention related to an elevator using the dynamic vibration absorbing device.

[0002]

2. Description of the Related Art There are various types of rotating bodies. An example of such a rotating body is a rotating body that is turned around a main rope of an elevator. In an elevator in which a car is driven up and down by a hoist with a speed reducer, a constant frequency caused by the meshing of the gears of the speed reducer, that is, the exciting force of the meshing frequency is transmitted to the car through the rotating body and the main rope. Sometimes. Furthermore, to the vibration
When the longitudinal vibration of the main rope resonates, the car is greatly vibrated,
The ride quality was sometimes worse. Also, in an elevator that drives a car up and down by a Gareth hoist, the torque ripple of the electric motor may generate a vibration force of a constant frequency similar to the above, causing the car to vibrate.

[0003] With respect to such a constant frequency excitation force, a dynamic vibration absorber (dynamic damper) comprising a spring and a mass having the same resonance frequency as the excitation force between the excitation source and the cage. Is provided, vibration can be reduced. That is, in a so-called one-to-one roping type elevator in which the car speed is equal to the speed of the main rope, the main rope end is attached to the car frame. In such a structure, as disclosed in, for example, Japanese Utility Model Application Laid-Open No. Sho 56-103567, vibration can be suppressed by attaching a weight around the connection between the main rope and the car frame. Further, Japanese Patent Application Laid-Open No. 58-1
Japanese Patent Application Laid-Open No. 1486 and Japanese Patent Application Laid-Open No. 50-24953 disclose a device in which vibration is suppressed by a dynamic vibration absorbing device including a spring and a weight.

In a so-called two-to-one roping type elevator in which a car moves up and down at half the speed of the main rope, a hanging wheel is attached to the car side, so that the elevator is similar to a one-to-one roping type elevator. A dynamic vibration absorber cannot be installed. For this reason, for example, Japanese Patent Application Laid-Open
As disclosed in Japanese Patent No. 95693, the suspension wheel is supported by a spring or attached to a car via a dynamic vibration absorber to suppress vibration.

[0005]

A conventional dynamic vibration absorber for a rotating body is constructed as described above. For example, in the case of an elevator, the number of parts increases and the cost increases. Especially 2
In the elevator of the one-to-one roping system, the hanging wheel must be mounted on the car via the dynamic vibration absorber, so that the mounting space is large. For this reason, it is not easy to attach the dynamic vibration absorber after the fact, and there is a problem that it is difficult to take countermeasures even if the occurrence of vibration is found after installing the elevator.

In the conventional elevator, the vibration of the rotating body is not damped, but the propagation of the vibration transmitted from the rotating body to the main rope is limited to the car. For this reason, even if the vibration of the car can be suppressed and the riding comfort is improved, there is also a problem that the vibration transmitted to the living room of the building cannot be suppressed and a separate measure must be taken.

Further, as a dynamic vibration absorber for torsional vibration of a crankshaft or the like in an internal combustion engine, for example, a "Lanchester damper" using solid friction is well known ("Mechanical Mechanics" by Watari Watari, Kyoritsu Shuppansha, Showa 48). 11th edition
Printing, pages 81-82. ). However, this Lanchester damper uses viscous damping and friction damping,
Large variations in performance. For this reason, there were problems that quantitative design was difficult, adjustment was not easy, and retrofitting was difficult.

The present invention solves the above-mentioned problems, and provides a dynamic vibration absorbing device for a rotating body that can be easily mounted. In addition, a dynamic vibration absorber that is easy to quantitatively design and easy to adjust is provided.

[0009]

According to a first aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body, wherein a pendulum having a weight attached to a rod rotatably supported on the side of the rotating body is provided. The side of the rod is pressed by an elastic body so as to face in the radial direction.

According to a second aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body in which a pendulum and an elastic body are attached to a side portion of the rotating body along a predetermined circumference at equal division angles.

According to a third aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body, wherein a pendulum and an elastic body are attached to both sides of the rotating body.

According to a fourth aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body, wherein a weight is attached to a rod at a position closer to the center of the rotating body than a position pressed by the elastic body.

According to a fifth aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body, wherein small pieces are stacked and fastened to a rod, and the small pieces are attached and detached to increase or decrease the amount of weight attached, and the tightening position is changed to attach the weight. The position is changed.

According to a sixth aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body, wherein the elastic body is a spring. In the dynamic vibration absorbing device for a rotating body according to claim 7, the spring is a leaf spring. In the dynamic vibration absorbing device for a rotating body according to claim 8, the elastic body is made of rubber. According to a ninth aspect of the present invention, in the dynamic vibration absorbing device for a rotating body, the elastic body is made of rubber with a spring provided therein.

According to a tenth aspect of the present invention, the dynamic vibration absorbing device is mounted on a rotating body of the elevator. An elevator according to claim 11 is one in which a dynamic vibration absorber is attached to a sheave of a hoist. An elevator according to a twelfth aspect is one in which a dynamic vibration absorber is attached to a hanging car of a car. According to a thirteenth aspect of the present invention, the dynamic vibration absorber is attached to a return vehicle that is attached to the top of the hoistway and makes the main rope hang down.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 to FIG.
1 shows a first embodiment of the present invention. In the figure, 1 is a rotating body, 4 is a side portion of the rotating body 1, and 5 is an axis of the rotating body 1. 7
Are a pair of pendulum type dynamic vibration absorbers attached to the side part 4 of the rotating body 1 to absorb vibration generated in the rotating body 1, and are mounted at symmetrical positions so that the whole rotating part is balanced. ing.

The dynamic vibration absorber 7 includes a frame 8 having both sides 8a bent to form a U-shape, mounting bolts 9 for attaching the frame 8 to the side 4 of the rotating body 1, and a shaft 12 attached to the frame 8. A pendulum base 11 that is part of a rod 13 that is rotatably supported and extends toward the shaft 5
And a weight 14 attached to the end of the rod 13 on the shaft 5 side.
And both ends of the frame 8 penetrating the pendulum base 11
a is fixed via a washer 17 to a nut 18 screwed to the penetrating rod 15 at one end, and the other end is abutted on both side surfaces of the pendulum base 11 so that the rod 13 is An elastic body 16 composed of a pair of coil springs that presses toward the center of the shaft 5.

The weight 14 is formed by stacking small pieces 14a each having a through-hole formed therein.
Is threaded and nuts 14b are screwed into the rod 13 at both ends.
The amount of attachment is increased or decreased by removing the nut 14b and attaching and detaching the small piece 14a, and the attachment position is changed by changing the tightening position of the nut 14b. Further, by changing the position of the nut 18, the pressing force of the coil spring 16 can be changed.

Next, the operating principle of the dynamic vibration absorber 7 will be described with reference to FIG.
It will be described according to. Here, m: mass of the weight 14, L:
Distance from the axis 12 to the center of gravity of the weight 14, g: acceleration of gravity, k: spring constant of the coil spring 16, a: distance from the axis 12 to the point of action of the coil spring 16, θ: the rod 13 from the vertical line Assuming angular displacement, the equation of motion of the dynamic vibration absorber 7 is represented by the following equation (1).

[0020]

(Equation 1)

From the equation, the resonance frequency ωn of the dynamic vibration absorber 7
Is represented by the following equation (2).

[0022]

(Equation 2)

In the equation, by taking the spring constant k sufficiently large,

[0024]

(Equation 3)

[0025] Therefore, the resonance frequency ωn of the dynamic vibration absorber 7 is represented by the following equation (4).

[0026]

(Equation 4)

In order to suppress the vibration of the rotating body 1 by the dynamic vibration absorbing device 7, the excitation frequency acting on the rotating body 1 and the resonance frequency ωn of the dynamic vibration absorbing device 7 are matched. Thereby, the pendulum 7 largely shakes, and the vibration of the rotating body 1 is reduced by the reaction force. Theoretically, the amplitude can be suppressed to “0”.

By the way, a general vibration model of a pendulum type dynamic vibration absorber is as shown in FIG. That is, the mass M
And a spring constant K, a weight 2 having a mass m
A pendulum-type dynamic vibration absorbing device 21 including a spring 21S having 1 W and a spring constant k is mounted. Here, the larger the mass m, the greater the reaction force is obtained, and therefore the amplitude of the pendulum itself is reduced, but the weight 21W is increased in size. Conversely, if the mass m is small, the weight 21W is small, but the amplitude of the pendulum is large and the stroke of the spring 21S is large, so that the dynamic vibration absorbing device 21 itself is large. Therefore, when the mounting place is limited, the dynamic vibration absorbing device 21 corresponding to the vibration frequency of the main vibration system 20 cannot be mounted in some cases.

According to the first embodiment, the dynamic vibration absorber 7
Is set to be equal to the excitation frequency, so that the vibration of the rotating body 1 is reduced. As is apparent from the equation (4), if the spring constant k, the distance L, and the distance a are changed as parameters, various resonance frequencies ωn can be set without changing the mass m of the weight 14, Further, the reaction force of the dynamic vibration absorber 7 can be increased. That is, axis 1
By changing the distance L from 2 to the center of gravity of the weight 14, the mass of the weight 14 can be equivalently changed. Therefore, with the dynamic vibration absorbing device 7 including the combination of the same spring 16 and the same weight 14, vibrations with different excitation frequencies can be reduced.

Even when the reaction force of the dynamic vibration absorbing device 7 is increased, the spring constant k
And the distance L may be changed. The spring constant k is
Since the influence on the external dimensions is small even if the wire diameter becomes large, the dynamic vibration absorber 7 does not become large. Therefore, a large vibration reduction can be obtained with the weight 14 having a small mass m.

Further, since the resonance frequency ωn can be set to match the vibration frequency of the rotating body 1 with the dynamic vibration absorber 7 having the same outer shape, the same dynamic vibration absorber 7 can cope with a wide range of vibration frequencies. And the cost can be reduced.
Furthermore, by changing the distance L from the shaft 12 to the center of gravity of the weight 14, the mass of the weight 14 can be equivalently changed, so that the dynamic vibration absorbing device 7 can be reduced in size and space can be saved. Becomes For this reason, it is particularly effective when the dynamic vibration absorbing device 7 is attached as a post measure.

Further, as is apparent from the equation (4), the resonance frequency ωn is determined by the spring constant k, the mass m, and the distances L and a.
Therefore, the design is quantitative and the variation in performance is small. Since the adjustment is mainly performed by moving the weight 14, it can be easily adjusted even at the site where the equipment is installed.

Embodiment 2 FIG. 6 to 8 show a second embodiment of the present invention, in which three or more dynamic vibration absorbing devices 7 are attached to the side portion 4 of the rotating body 1 at equal division angles along a predetermined circumference. is there. That is, FIG. 6 shows a case where three dynamic vibration absorbers 7 are attached to the rotating body 1 with a division angle of 120 degrees. FIG. 7 shows a case where four dynamic vibration absorbers 7 are attached to the rotating body 1 with a 90-degree division angle therebetween. FIG. 8 shows a case where two dynamic vibration absorbers 7 are attached to both the front and back sides of the rotating body 1.

According to the second embodiment, similarly to the first embodiment, the vibration of the rotating body 1 can be reduced, and the dynamic vibration absorbing devices 7 are attached at every equal division angle.
Dynamic balance can be maintained. In addition, since the number of attached dynamic vibration absorbing devices 7 is increased, a reaction force required for reducing vibration can be obtained. Furthermore, even if the vibration of the rotating body 1 includes a plurality of excitation frequencies, the vibration can be reduced by setting the resonance frequency ωn for each excitation frequency.

Embodiment 3 FIG. 9 to 11 show a third embodiment of the present invention, and particularly show various aspects of an elastic body. That is, in FIG. 9, the elastic body of the dynamic vibration absorber 7 is a tubular rubber 16A. For this reason, it is possible to eliminate the squeak noise caused by expansion and contraction, and to set various strokes with various spring constants by changing the material of the rubber 16A or changing the pressure receiving area. It can also be consumed within 16A.

FIG. 10 shows that the elastic body is a coil spring 16.
Is a tubular rubber 16B provided inside. Also in this case, the squeak noise can be eliminated, and the vibration energy can be consumed in the rubber 16A. Further, FIG. 11 shows a configuration in which one ends of a pair of elastic bodies 16 formed of a coil spring are directly in contact with the inner surface of the side portion 8 a of the frame 8. For this reason, when the excitation frequency of the rotating body 1 is known and constant, the dynamic vibration absorbing device 7 that does not need to be adjusted can be provided.

Embodiment 4 FIG. FIG. 12 shows a fourth embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. The weight 14 </ b> W is formed by laminating unequal pieces 14 </ b> Wa and tightening with a nut 14 </ b> B screwed to the rod 13. Therefore, the distance L from the shaft 12 to the center of gravity of the weight 14W is increased, and the reaction force required for vibration damping can be increased without increasing the weight of the dynamic vibration absorber 7.

Embodiment 5 FIG. 13 shows the fifth embodiment, in which the elastic body is a leaf spring. As shown in FIG. 9A, a pendulum support arm 54 is provided at the center of the plate 51 to form a shaft mounting hole 54a, and mounting legs 55 are provided at both sides to form a mounting hole 55a. Install and integrally mold. As shown in FIG. 2B, the plate member 5 integrally formed
1 is bent in a U-shape having a bottom 52 as a center, and both sides are formed as leaf springs 53, a pendulum support arm 54 is bent inward, and a mounting leg 55 is further bent outward. As shown in FIG. 3C, the shaft 12 is fitted into the shaft mounting hole 54a, and the pendulum base 11 is included in the U-shaped portion. This allows the leaf spring 5
3 comes into contact with the pendulum base 11 via the contact piece 56 to
Limit the sway of zero. The pendulum-type dynamic vibration absorbing device 50 assembled in this manner is mounted on the rotating body with the mounting bolt 9.

Also in the fifth embodiment, the vibration of the rotating body can be reduced by the dynamic vibration absorbing device 50, and the plate spring 53 extends in parallel with the rod 13 of the pendulum 10. The width dimension of 50 can be reduced, and it can be attached to a narrow place. Also,
By changing the position of the contact piece 56, both the spring constant and the reaction force of the leaf spring 53 can be changed.

Embodiment 6 FIG. FIG. 14 shows the sixth embodiment. Here, the above-described dynamic vibration absorbing device is used for an elevator, and is attached to a rotating body around which a main rope for suspending a car is wound. In the figure, reference numeral 30 denotes a building constituting an elevator shaft, 31 a beam laid on the top of the shaft, 32 a pit, 33 a hoist installed on the pit 32, and 33a a rope of the hoist 33. Car, 34 is a main rope wound around the sheave 33a, 35 is a basket suspended by the main rope 34,
36 is a pair of hanging wheels mounted below the floor of the car 35 and around which the main rope 34 is wound, 37 is a suspended weight suspended on the main rope 34, 38 is a weight side hanging wheel, and 39 is mounted on the beam 31. A return wheel that causes the main rope 34 to hang down, and 40 is also a weight side return vehicle. The sheave 33a, the lifting sheave 36, the return sheave 39, and the weight side return sheave 40 are each provided with a dynamic vibration absorber 7
Is installed.

In an elevator, the meshing of gears in a speed reducer of a hoist 33 is generally used, and in an elevator without a speed reducer, a torque ripple of an electric motor is a main excitation source. Therefore, when the car 35 is moving up and down at a constant speed, the excitation frequency is constant. The vibration generated by the hoisting machine 33 is transmitted to the car 35 via the return wheel 39 as vertical vibration of the main rope 34. Therefore, when the dynamic vibration absorbing device 7 is attached to the sheave between the hoisting machine 33 and the car 35, the vibration damping effect is large.

According to the sixth embodiment, the sheave 33a,
Since the dynamic vibration absorbing device 7 is attached to each of the return wheel 39 and the lifting wheel 36, the propagation of vibration to the car 35 can be reduced. In particular, by attaching the dynamic vibration absorbing device 7 to the sheave 33a of the hoisting machine 33, the vibration that the hoisting machine 33 becomes a vibration source absorbs the vibration itself, and is therefore limited to simply reducing the vibration of the car 35. Therefore, vibration to the building 30 is also reduced. The weight side lifter 38 and the weight side return wheel 4
0, the dynamic vibration absorber 7 is attached to the main rope 3 on the weight side.
Vibration transmitted to the building 30 via 4 can also be reduced.

[0043]

Since the present invention is configured as described above, it has the following effects. In the dynamic vibration absorbing device for a rotating body according to the first aspect, a pendulum having a weight attached to a rod rotatably supported on the side of the rotating body is pressed by an elastic body to adjust the resonance frequency to the excitation frequency. It has been adjusted as follows. For this reason, when the vibration occurs, the pendulum largely shakes, the vibration of the rotating body is reduced by the reaction force, and the resonance frequency can be easily changed by changing the position of the weight, and the adjustment is easy. The effect is as follows.

According to a second aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body in which a pendulum and an elastic body are attached to the side of the rotating body along a predetermined circumference at equal angle divisions. For this reason, by increasing the number of attachments, it is possible to easily obtain a reaction force necessary for reducing vibration, and even if the vibration of the rotating body includes a plurality of vibration frequencies, By setting the resonance frequency for each case, there is an effect that vibration can be reduced.

According to a third aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body in which a pendulum and an elastic body are attached to both sides of the rotating body.
For this reason, there is an effect that it is possible to cope with vibrations of a wide range of excitation frequencies.

According to a fourth aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body in which a weight is attached to a rod at a position closer to the center of the rotating body than a position pressed by the elastic body. For this reason, the dynamic vibration absorbing device is housed in the side surface of the rotating body, and there is an effect that the space can be saved.

According to a fifth aspect of the present invention, there is provided a dynamic vibration absorbing device for a rotating body, in which small pieces are stacked and fastened to a rod, the amount of weight attached is increased or decreased by attaching and detaching the small pieces, and the weight is attached by changing the tightening position. The position is changed.
Therefore, there is an effect that the resonance frequency can be easily adjusted.

According to a sixth aspect of the present invention, there is provided a dynamic vibration absorber for a rotating body, wherein the elastic body is a spring. For this reason, there is an effect that the spring constant can be set to a constant value. In the dynamic vibration absorbing device for a rotating body according to claim 7, the spring is a leaf spring. For this reason, there is an effect that the size can be reduced. In the dynamic vibration absorbing device for a rotating body according to claim 8, the elastic body is made of rubber. For this reason, there is an effect that a squeak sound caused by expansion and contraction can be eliminated. According to a ninth aspect of the present invention, in the dynamic vibration absorbing device for a rotating body, the elastic body is made of rubber with a spring provided therein. This also has an effect that the squeak noise can be eliminated.

According to a tenth aspect of the present invention, in the elevator, the dynamic vibration absorbing device is mounted on a rotating body of the elevator. For this reason, vibration can be reduced under the above effects.
An elevator according to claim 11 is one in which a dynamic vibration absorber is attached to a sheave of a hoist. For this reason, there is an effect that the generation of the vibration using the hoist as the excitation source can be reduced. An elevator according to a twelfth aspect is one in which a dynamic vibration absorber is attached to a hanging car of a car. For this reason, there is an effect that the propagation of vibration to the car can be prevented, and a good ride quality can be obtained. According to a thirteenth aspect of the present invention, the dynamic vibration absorber is attached to a return vehicle that is attached to the top of the hoistway and makes the main rope hang down. Therefore, there is an effect that the vibration is absorbed by the return wheel and the propagation of the vibration to the car can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a dynamic vibration absorbing device mounted on a rotating body according to Embodiment 1 of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the dynamic vibration absorber according to Embodiment 1 of the present invention.

FIG. 4 is a vibration model diagram of the dynamic vibration absorber according to the first embodiment of the present invention.

FIG. 5 is a general vibration model diagram of a pendulum type dynamic vibration absorber.

FIG. 6 is a perspective view of a rotating body according to the second embodiment of the present invention;
FIG. 3 is a front view of the individually mounted dynamic vibration absorber.

FIG. 7 is a front view of the dynamic vibration absorber similarly mounted on the rotating body.

FIG. 8 is a side view of the dynamic vibration absorber mounted on the front and back surfaces of the rotating body.

FIG. 9 is a front view showing, in cross section, main parts of a dynamic vibration absorber according to Embodiment 3 of the present invention.

FIG. 10 is a front view showing a cross section of a main part of the dynamic vibration absorber.

FIG. 11 is a front view of the dynamic vibration absorber.

FIG. 12 is a front view of a dynamic vibration absorber according to Embodiment 4 of the present invention.

FIG. 13 is a front view of a dynamic vibration absorber according to Embodiment 5 of the present invention.

FIG. 14 is a conceptual diagram showing an application example of a dynamic vibration absorber according to a sixth embodiment of the present invention to an elevator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotating body, 4 side parts, 5 axes, 6, 7 Dynamic vibration absorbing device, 8 Frame, 9 Mounting bolt, 10
Pendulum, 11 pendulum base, 12 shaft, 13 rod, 14 weight, 14b nut, 14W weight, 14Wa small piece, 15 penetrating rod, 15a
Nut, 16 coil spring, 16A rubber, 16B
Rubber, 20 vibration system, 21 dynamic vibration absorber, 30
Building, 31 beams, 32 pits, 33 hoisting machines, 33a sheaves 34 main ropes, 35 cars, 3
6 hanging wheel, 37 hanging weight, 38 weight side hanging wheel, 39 turning wheel, 40 weight side turning wheel, 50
Dynamic vibration absorbing device, 51 plate material, 52 bottom part, 53
Leaf spring, 54 pendulum support arm, 54a shaft mounting hole,
55 mounting leg, 55a mounting hole 56 contact piece.

Claims (13)

[Claims] 1. A pendulum having a weight attached to a rod rotatably supported on the side of a rotating body, and a rod attached to the side of the rotating body and pressing both sides of the rod by pressing both sides of the rod. A dynamic vibration absorbing device for a rotating body, comprising an elastic body for directing light in a radial direction. 2. The dynamic vibration absorbing device according to claim 1, wherein the pendulum and the elastic body are attached to the side of the rotating body along a predetermined circumference at equal division angles. 3. The dynamic vibration absorber according to claim 1, wherein the pendulum and the elastic body are attached to both sides of the rotating body. 4. The dynamic vibration absorber according to claim 1, wherein the weight is attached to the rod at a position closer to the center of the rotating body than a position pressed by the elastic body. 5. The weight is such that small pieces are stacked and fastened to a rod, and the amount of attachment is increased or decreased by attaching and detaching the small pieces, and the attachment position is changed by changing the tightening position. Item 2. The dynamic vibration absorber according to Item 1. 6. The dynamic vibration absorber according to claim 1, wherein the elastic body is a spring. 7. The dynamic vibration absorber according to claim 6, wherein the spring is a leaf spring extending in parallel with the rod. 8. The dynamic vibration absorber according to claim 1, wherein the elastic body is made of rubber. 9. The dynamic vibration absorbing device according to claim 1, wherein the elastic body is a rubber having a spring provided therein. 10. An elevator, wherein the dynamic vibration absorber according to claim 1 is mounted on a rotating body around which a main rope for suspending a car is wound. 11. The rotating body is a sheave of a hoist.
The elevator according to 0. 12. The elevator according to claim 10, wherein the rotating body is a hanging wheel mounted on a car. 13. The elevator according to claim 10, wherein the rotating body is a return car attached to the top of the hoistway to suspend the main rope.