JP6826547B2 - Elevator hoisting machine and elevator - Google Patents

Description

The present invention relates to an elevator hoisting machine equipped with an encoder, and an elevator equipped with the elevator hoisting machine.

Generally, bearings are used in the rotating mechanism of the hoisting machine for raising and lowering the car of an elevator, and grease is often used as a lubricant. The grease storage unit is often equipped with various seal structures such as a labyrinth seal and an oil seal, but when the pressure of the grease storage unit rises excessively or when the function of the seal structure deteriorates due to aging deterioration, etc. Grease may leak from the seal structure. Since the leaked grease causes stains on the hoisting machine and other elevator equipment, a hoisting machine equipped with an oil pan for collecting the leaked grease is known.

As oil receivers installed in the hoisting machine, for example, in Patent Document 1, a housing containing a stator and a stator winding, a main shaft cantilevered and fixedly supported by the housing, and the above-mentioned main shaft are provided. A bearing housing rotatably attached to the end via a bearing, a rope wheel integrally formed with the bearing housing, and a motor having a plurality of permanent magnets integrally formed with the rope wheel and facing the stator. In a thin hoisting machine for an elevator device equipped with a rotor of the above, an oil drop space is formed below the gap between the housing and the bearing housing, and the side of the housing opposite to the rope wheel. An oil reservoir is formed on the end surface, which is located in the lower part of the oil drop space and communicates with the oil reservoir, and a window in which the oil reservoir can be visually recognized from the side surface side of the housing opposite to the bearing wheel. An annular oil is formed on the outer peripheral side of the bearing housing and is provided with an annular protrusion integrated with the housing, and is located on the rope wheel side of the gap between the housing and the bearing housing. The bearing cover is attached to the annular protrusion, the oil drop space is formed between the oil receiving cover located inside the annular protrusion and the housing, and the oil receiver located outside the annular protrusion. A thin hoisting machine for an elevator device is described, wherein a connecting electric wire for connecting the stator windings to each other is arranged between the cover and the housing.

Patent No. 5468028

However, the hoisting machine described in Patent Document 1 is formed on the end face of the housing opposite to the sheave when the oil sealing material on the end face side opposite to the sheave of the housing leaks. It is possible to remove the leaked oil through the oil reservoir and the window, but no consideration is given to the case where the oil sealing material on the sheave side leaks.

Therefore, in the case of a hoisting machine that has a hollow spindle and houses an encoder inside it, if the oil sealing material on the sheave side leaks, the oil will reach the encoder and the hoisting machine. And there was a risk of elevator failure.

In consideration of the above problems, an object of the present invention is to discharge the oil to the outside of the hoist without reaching the encoder even if the oil sealing material on the sheave side leaks. To provide elevator hoisting machines and elevators that can.

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present application includes a plurality of means for solving the above problems. For example, an elevator hoisting machine includes a housing containing a motor bearing having a winding and a cantilever fixed support in the housing. A hollow spindle, a bearing housing rotatably attached to the outer periphery of the tip of the hollow spindle via a bearing, a rope wheel integrally formed with the bearing housing, and a motor stator formed integrally with the rope wheel. Lubricating oil filled in the facing gaps arranged on both sides of the bearing in the facing gap between the outer circumference of the tip of the hollow spindle and the inner circumference of the bearing housing and the rotor yoke having a plurality of permanent magnets facing the bearing. An oil-sealing material to be sealed, a ring-shaped bearing retainer fixed to the tip edge of the hollow spindle and regulating the position of the bearing on the tip side of the hollow spindle, and a ring-shaped bearing retainer facing the tip edge of the hollow spindle. Holds a disk-shaped bearing cover fixed to the bearing housing, an encoder arranged in the hollow part of the hollow main shaft, a support shaft that supports the encoder, and a support shaft provided on the rotation center shaft of the bearing cover. It is provided with a cylindrical encoder support portion, and has a groove on the outer peripheral portion of the encoder support portion for accommodating the lubricating oil leaked from the oil sealing material, and the lubricating oil contained in the groove is radially scattered by centrifugal force. It has an oil drain groove portion that prevents the lubricating oil from moving to the encoder. Further, the ring-shaped bearing retainer is provided with an oil drain portion formed of a through hole formed in a direction perpendicular to the axial direction of the hollow spindle for allowing the lubricating oil leaked from the oil sealing material to escape in the gravity direction. ..

In addition, the elevator is equipped with a car and a hoisting machine for raising and lowering the car in the hoistway, and the hoisting machine has a housing containing a motor stator having a winding and a cantilever in the housing. A hollow spindle that is fixedly supported, a bearing housing that is rotatably attached to the outer periphery of the tip of the hollow spindle via a bearing, a rope wheel that is integrally formed with the bearing housing, and a motor that is integrally formed with the rope wheel. Lubricants filled in the facing gaps arranged on both sides of the bearing in the facing gap between the outer circumference of the tip of the hollow spindle and the inner circumference of the bearing housing and the rotor yoke having multiple permanent magnets facing the stator. An oil-sealing material that seals oil, a ring-shaped bearing retainer that is fixed to the tip edge of the hollow spindle and regulates the position of the bearing on the tip side of the hollow spindle, and a ring-shaped bearing retainer that faces the tip edge of the hollow spindle. A disk-shaped bearing cover fixed to the bearing housing, an encoder arranged in the hollow portion of the hollow main shaft, a support shaft for supporting the encoder, and a support shaft provided on the rotation center shaft of the bearing cover. A cylindrical encoder support portion for holding the bearing and a groove for accommodating the lubricating oil leaked from the oil sealing material are provided on the outer peripheral portion of the encoder support portion, and the lubricating oil contained in the groove is radially radial by centrifugal force. It has an oil drain groove portion that prevents the lubricating oil from moving to the encoder by scattering the bearing. Further, the ring-shaped bearing retainer is provided with an oil drain portion formed of a through hole formed in a direction perpendicular to the axial direction of the hollow spindle for allowing the lubricating oil leaked from the oil sealing material to escape in the gravity direction. ..

According to the present invention, the leaked oil can be discharged to the outside of the hoist without reaching the encoder.
Issues, configurations and effects other than those described above will be clarified by the following description of the embodiments.

It is a schematic block diagram which shows typically the elevator which concerns on the Example of Embodiment of this invention. It is sectional drawing of the hoist which concerns on embodiment of this invention. It is an enlarged sectional view of the main part of the hoisting machine which concerns on the Example of Embodiment of this invention. It is a front view seen from the bearing cover side of the hoisting machine which concerns on embodiment of this invention.

Hereinafter, an example of an embodiment of the hoisting machine for an elevator and the elevator of the present invention will be described with reference to the drawings. The common members in each figure are designated by the same reference numerals.

First, an example of an embodiment of an elevator using the elevator hoisting machine of the present invention (hereinafter, referred to as “this example”) will be described with reference to FIG.
FIG. 1 is a schematic configuration diagram schematically showing an elevator 50 of this example.

As shown in FIG. 1, the elevator 50 includes a landing 33 provided on each floor, a car 35 that moves up and down in the hoistway 34, and a counterweight 36. A machine room 37 is provided above the hoistway 34. In the machine room 37, a hoisting machine 30 for an elevator and an elevator control device (not shown) are installed.

A main rope 38 connecting a car 35 and a counterweight 36 is wound around the hoisting machine 30. Then, by driving the motor of the hoisting machine 30, the car 35 moves up and down in the hoistway 34.

FIG. 2 is a cross-sectional view of the elevator hoisting machine 30 of this example.
As shown in FIG. 2, the elevator hoisting machine 30 has a housing 1 which is a fixed side element, and a hollow boss portion 2 is formed in the central portion of the housing 1. Further, a bottomed substantially cylindrical storage recess 3 is formed on the outer peripheral portion of the housing 1. A motor stator 4 having a winding is stored and fixed in the storage recess 3.

On the other hand, a hollow spindle 5 is inserted into the central portion of the boss portion 2 to be cantilevered and fixed. A pair of bearings 6 and 7 are provided on the outer peripheral portion of the tip of the hollow spindle 5, and the bearing housing 9 provided with the sheave 8 is rotatably supported via the bearings 6 and 7. A main rope 38 (not shown) is wound around the sheave 8, and the car 35 of the elevator 50 is moved up and down via the main rope 38.

The rotor yoke 10 of the motor that has entered the storage recess 3 of the housing 1 described above is integrally coupled to the outer peripheral portion of the sheave 8, and the motor stator 4 described above is integrally connected to the rotor yoke 10. A plurality of permanent magnets 11 arranged in the circumferential direction so as to face each other are attached.

It was formed by the current flowing through the motor stator 4 by the motor stator 4 installed on the housing 1 side and the permanent magnets 11 installed on the rotor yoke 10 coupled to the rope wheel 8 side. The rope wheel 8 rotates due to the action of the magnetic field and the electromagnetic force generated by the magnetic field formed by the permanent magnet 11.

A facing gap 26 is formed between the inner peripheral surface of the bearing housing 9 and the outer peripheral surface near the tip of the hollow spindle 5, and the bearings 6 and 7 described above are arranged side by side in the axial direction in the facing gap 26. At the same time, oil sealing materials 12 and 13 such as oil seals are arranged on both sides of the bearings 6 and 7.

The oil sealing material 12 arranged on the base end side of the hollow spindle 5 is position-regulated by the step portion 5a formed on the outer peripheral portion of the hollow spindle 5, and is located on the tip end side (net wheel side) of the hollow spindle 5. The position of the arranged oil sealing material 13 is restricted by a ring-shaped bearing retainer 14 fitted in the tip edge portion of the hollow spindle 5. The facing gaps 26 between the oil sealing materials 12 and 13 arranged at both ends of the bearings 6 and 7 in the axial direction are filled with a lubricant such as grease or lubricating oil that improves the lubrication of the bearings 6 and 7. ..

A disk-shaped bearing cover 15 that rotates in synchronization with the sheave 8 is fixed at a position of the bearing housing 9 facing the tip end surface 5b of the hollow spindle 5. Further, a cylindrical support base 40 for holding the encoder shaft 16 is mounted on the central shaft on the back surface 15b side of the bearing cover 15. An encoder 17 arranged so as to be located in the hollow portion 5c of the hollow spindle 5 is attached to the encoder shaft 16 held by the support base 40 as the encoder support portion. A controller (not shown) is connected to the encoder 17, and the rotation speed and rotation direction of the motor are controlled by the controller.

FIG. 3 is an enlarged cross-sectional view of a main part of the elevator hoisting machine 30 of this example near the tip of the hollow spindle 5.
As shown in FIG. 3, a pair of bearings 6 and 7 having a spacer 18 interposed therebetween are arranged between the inner peripheral surface of the bearing housing 9 and the outer peripheral surface of the hollow spindle 5, and the tip of the hollow spindle 5 is arranged. The bearing 6, the spacer 18, and the bearing 7 are held in a predetermined position by the ring-shaped bearing retainer 14 fixed to. Further, the step portion 14a formed on the ring-shaped bearing retainer 14 holds the oil sealing material 13 arranged on the tip end side of the hollow spindle 5.

The oil or oil content of the lubricant leaking from the oil sealing material 13 is applied in the direction of the arrow to the outer peripheral portion of the ring-shaped bearing retainer 14 and the facing portion of the bearing housing 9, and to the facing portion of the oil sealing material 13 and the bearing cover 15. An oil flow path space R1 is formed to allow the oil to escape to. Further, an oil flow path space R2 through which the lubricant flows in the direction of the arrow is formed in the gap space between the ring-shaped bearing retainer 14 on the fixed side and the bearing cover 15 on the rotating side.

The bearing cover 15 in the vicinity of the oil flow path space R1 includes through holes formed in the axial direction of the hollow spindle 5 for discharging the lubricant passing through the oil flow path space R1 to the outside of the bearing cover 15. A discharge hole 20 is provided.

A plurality of discharge holes 20 are provided in the bearing cover 15. The plurality of discharge holes 20 are formed on a virtual circumference equidistant from the center of rotation, as shown in FIG. 4, which is a front view of the hoisting machine 30 viewed from the bearing cover 15 side. The discharge hole 20 is formed at a position facing the oil flow path space R1.

Further, an oil drain groove portion 22 having a groove formed along the direction in which the support base 40 rotates is formed on the outer peripheral portion of the support base 40 located between the oil flow path space R2 and the encoder 17. .. The cross section of the groove of the oil drain groove portion 22 of this example is formed in a U shape, and is provided over the entire circumference of the support base 40. In the oil drain groove portion 22, the lubricant contained in the groove passes through the oil flow path space R2 and is radially scattered by the centrifugal force generated by the rotation of the bearing cover 15 (support base 40). By providing a curved portion in the cross-sectional shape of the groove, the lubricant can be efficiently scattered.

The ring-shaped bearing retainer 14 located below the support base 40 in the direction of gravity is formed with an oil drain portion 24 composed of through holes, slits, and the like for allowing the lubricant scattered from the oil drain groove portion 22 to escape further downward. Has been done. Further, the oil drain portion 24 is formed in the ring-shaped bearing retainer 14 so that the lower end portion of the through hole is located in the vicinity of the discharge hole 20.

The ring-shaped bearing retainer 14 located below the oil drain groove portion 22 in the direction of gravity is formed with an annular oil reservoir convex portion 23 extending in a direction perpendicular to the axial direction of the hollow spindle 5. The oil reservoir convex portion 23 is provided on the surface of the ring-shaped bearing retainer 14, and blocks the lubricant scattered from the oil drain groove portion 22 and adhering to the surface of the ring-shaped bearing retainer 14 so as not to be transmitted to the hollow spindle 5. .. Further, by providing the oil reservoir convex portion 23, it is possible to facilitate the escape of the dammed lubricant to the oil draining portion 24.

In this example, when the lubricant leaks from the oil sealing material 13 arranged on the bearing cover 15 side, the leaked lubricant first passes through the oil flow path space R1 and goes out of the hoisting machine from the discharge hole 20. It is discharged. Then, the lubricant not discharged from the discharge hole 20 passes through the oil flow path space R2 and heads toward the center of rotation of the sheave 8. That is, the lubricant toward the center of rotation of the sheave 8 travels along the ring-shaped bearing retainer 14 while being affected by gravity, and moves to the support base 40 arranged at the center of the bearing cover 15.

The lubricant adhering to the surface of the support base 40 goes toward the encoder 17 side while traveling along the outer peripheral surface of the support base 40, and in the middle of this movement, the lubricant adheres to the groove of the oil drain groove portion 22 formed on the outer peripheral surface of the support base 40. Be housed. Then, the lubricant contained in the groove is radially scattered along the rotation direction by the centrifugal force generated by the rotation of the support base 40 (bearing cover 15).

The lubricant scattered downward by the oil drain groove portion 22 reaches the inner diameter surface 14a side of the ring-shaped bearing retainer 14 located below the support base 40, and collects on the inner diameter surface 14a of the ring-shaped bearing retainer 14. The lubricant accumulated on the inner diameter surface 14a of the ring-shaped bearing retainer 14 is quickly guided downward by gravity through the oil drain portion 24, and the oil reservoir between the oil sealing material 13 below and the bearing cover 15 is located. It collects in space 29. After that, when the plurality of discharge holes 20 formed in the bearing cover 15 reach the positions facing the oil reservoir space 29, the lubricant is discharged to the outside of the hoisting machine through the discharge holes 20. On the other hand, the lubricant scattered upward by the oil drain groove portion 22 moves downward due to gravity with the passage of time, and reaches the groove of the oil drain groove portion 22 of the support base 40 again.

According to the elevator hoisting machine 30 of this example, even if the lubricant leaks from the oil sealing material 13 arranged on the ring-shaped bearing retainer 14 side, the rotating structure of the hoisting machine can be used. The leaked lubricant flow is guided so as not to reach the encoder 17. Then, the leaked lubricant can be discharged to the outside of the hoist from the discharge hole 20 provided in the bearing cover 15 by the oil drain groove portion 22, the oil drain portion 24, and the discharge hole 20.

As described above, in this example, the lubricant leaking from the oil sealing material 13 is circulated and moved inside the hoisting machine, and is discharged to the outside of the hoisting machine before reaching the encoder 17. That is, even if the lubricant leaks from the oil sealing material 13, the leaked lubricant does not enter the encoder 17.

When the leaked lubricant is discharged to the outside of the hoisting machine, special oil is added to the oil flow path space R2 between the ring-shaped bearing retainer 14 on the fixed side and the bearing cover 15 on the rotating side. There is no need to provide a sealing material.

Further, since the lubricant leaking from the oil sealing material 13 is less likely to adhere to the encoder 17, the encoder 17 can be arranged in the hollow portion 5a of the hollow spindle 5 by using the encoder shaft 16 having a relatively short shaft length. .. Therefore, the degree of freedom in designing the hoisting machine can be increased.

Further, the oil reservoir convex portion 23 formed on the inner diameter surface 14a of the ring-shaped bearing retainer 14 located below the oil drain groove portion 22 can prevent the lubricant from adhering to the encoder 17.

It should be noted that the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. For example, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

The groove of the oil draining groove portion 22 formed on the outer peripheral portion of the support base 40 of this example is formed over the entire circumference along the rotation direction of the support base, but it is not always necessary to form the groove on the entire circumference. .. Further, the cross section of the groove of the oil draining groove portion 22 of this example is formed in a U shape, but the shape of the cross section is not limited to this, and may be concave, for example. Further, the number of grooves in the oil draining groove portion 22 may be a plurality.

1 ... housing, 2 ... boss, 4 ... motor stator, 5 ... hollow spindle, 6, 7 ... bearing, 8 ... rope wheel, 9 ... bearing Housing, 10 ... Rotor yoke, 12, 13 ... Oil sealant, 14 ... Ring-shaped bearing holder, 15 ... Bearing cover, 16 ... Encoder shaft, 17 ... Encoder, 20 ... Discharge hole, 22 ... Oil drain groove, 23 ... Oil reservoir convex part, 24 ... Oil drainage part, 26 ... Opposing gap, 30 ... Elevator hoisting machine, 35.・ ・ Riding car, 38 ・ ・ ・ Main rope, 40 ・ ・ ・ Support stand, 50 ・ ・ ・ Elevator

Claims (7)

A housing that houses a motor stator with windings,
A hollow spindle that is cantilevered and fixedly supported by the housing,
A bearing housing rotatably attached to the outer periphery of the tip of the hollow spindle via a bearing,
A sheave formed integrally with the bearing housing and
A rotor yoke that is integrally formed with the sheave and has a plurality of permanent magnets facing the motor stator.
An oil sealing material for sealing the lubricating oil filled in the facing gap, which is arranged on both sides of the bearing in the facing gap between the outer periphery of the tip of the hollow spindle and the inner circumference of the bearing housing,
A ring-shaped bearing retainer that is fixed to the tip edge of the hollow spindle and regulates the position of the bearing on the tip side of the hollow spindle.
A disk-shaped bearing cover fixed to the bearing housing and rotating integrally with the bearing housing so as to face the tip edge of the hollow spindle.
An encoder arranged in the hollow portion of the hollow spindle and
A support shaft that supports the encoder and
In an elevator hoisting machine provided with a cylindrical encoder support portion for holding the support shaft, which is provided on the rotation center axis of the bearing cover.
A groove for accommodating the lubricating oil leaked from the oil sealing material is provided on the outer peripheral portion of the encoder support portion, and the lubricating oil contained in the groove is radially scattered by centrifugal force to move the lubricating oil to the encoder. set the oil thrower groove to prevent that,
An elevator provided with a ring-shaped bearing retainer provided with an oil drain portion formed of a through hole formed in a direction perpendicular to the axial direction of the hollow spindle for allowing the lubricating oil leaked from the oil sealing material to escape in the gravity direction. Hoisting machine. The hoisting machine for an elevator according to claim 1, wherein the groove of the oil drain groove portion is formed over the entire circumference of the encoder support portion. The hoisting machine for an elevator according to claim 1 or 2, wherein the cross-sectional shape of the groove of the oil drain groove portion is formed in a U shape. The claim that a plurality of through holes formed in the axial direction of the hollow spindle are provided concentrically with the rotation center axis of the bearing cover in order to allow the lubricating oil that has passed through the oil drain portion to escape to the outside of the bearing cover. The hoisting machine for an elevator according to 1 . The hoisting machine for an elevator according to claim 4 , wherein a semicircular annular oil reservoir convex portion extending in a direction perpendicular to the central axis of the hollow spindle is formed on the end edge side of the hollow spindle of the ring bearing retainer. .. The elevator hoist according to claim 5 , wherein the oil draining portion and the oil reservoir convex portion are provided at positions below the ring-shaped bearing retainer in the direction of gravity. Riding basket,
In an elevator equipped with a hoisting machine that raises and lowers the car in the hoistway.
The hoisting machine
A housing that houses a motor stator with windings,
A hollow spindle that is cantilevered and fixedly supported by the housing,
A bearing housing rotatably attached to the outer periphery of the tip of the hollow spindle via a bearing,
A sheave formed integrally with the bearing housing and
A rotor yoke that is integrally formed with the sheave and has a plurality of permanent magnets facing the motor stator.
An oil sealing material for sealing the lubricating oil filled in the facing gap, which is arranged on both sides of the bearing in the facing gap between the outer periphery of the tip of the hollow spindle and the inner circumference of the bearing housing,
A ring-shaped bearing retainer that is fixed to the tip edge of the hollow spindle and regulates the position of the bearing on the tip side of the hollow spindle.
A disk-shaped bearing cover fixed to the bearing housing and rotating integrally with the bearing housing so as to face the tip edge of the hollow spindle.
An encoder arranged in the hollow portion of the hollow spindle and
A support shaft that supports the encoder and
A cylindrical encoder support portion for holding the support shaft provided on the rotation center axis of the bearing cover, and a cylindrical encoder support portion.
A groove for accommodating the lubricating oil leaked from the oil sealing material is provided on the outer peripheral portion of the encoder support portion, and the lubricating oil contained in the groove is radially scattered by centrifugal force to move the lubricating oil to the encoder. It is equipped with an oil drainage groove that prevents it from being used.
The ring-shaped bearing retainer is provided with an oil draining portion formed of a through hole formed in a direction perpendicular to the axial direction of the hollow spindle for allowing the lubricating oil leaked from the oil sealing material to escape in the gravity direction. The elevator that is .

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