Elevator hoisting machine

Abstract

The present invention provides an elevator hoisting machine that makes it easier to detect oil leaks when an oil discharge channel is provided, and that prevents oil from being scattered into the hoistway. [Solution] An elevator hoisting machine comprising a fixed part 2 having a stator 213, a rotatable rotating part 3 having a rotor 33 positioned opposite the stator 213, a sheave that rotates with the rotation of the rotating part 3, a bearing 5 that rotatably supports the rotating part 3 relative to the fixed part 2, and an oil drain pipe 6 for guiding oil leaked from the bearing 5, wherein the hoisting machine is provided so as to be close to the rear wall surface G of the hoistway S, and the oil drain pipe 6 is provided with an inlet 6A positioned to receive oil leaked from the bearing 5, and is arranged such that the received oil is guided to the wall surface G of the hoistway S and then the outlet 6B is located at the lower end extending downwards of the hoisting machine.

Description

Technical Field

[0001] The present invention relates to a hoisting machine of an elevator.

Background Art

[0002] The hoisting machine of the elevator is provided with a sheave for suspending a car and a counterweight via a rope. In order to rotate the sheave, a bearing is provided between a rotating part and a fixed part that supports the rotating part in the hoisting machine. Inside the bearing, for example, grease is enclosed for lubrication. This grease is composed of a base oil, a thickener, an additive, and the like. As time passes, a phenomenon occurs in which the liquid base oil gradually separates from the grease.

[0003] The liquid base oil separated by this phenomenon may leak out of the bearing, and this leaked base oil may stain the machine room and the hoistway outside the hoisting machine. Further, it may enter the brake part of the hoisting machine and interfere with braking.

[0004] As a countermeasure, it is conceivable to provide an oil discharge path on the back side of the hoisting machine and discharge the base oil from the discharge path.

[0005] However, due to the presence of the wall of the hoistway on the back side of the hoisting machine, etc., the back side of the hoisting machine may be difficult to visually recognize, the discovery of oil leakage may be delayed, and there is a possibility that appropriate countermeasures cannot be taken.

[0006] On the other hand, Patent Document 1 shows a structure in which an oil discharge path is provided by a pipe member, but since it is a structure that guides to the front side of the hoisting machine, the induced oil may splash and adhere to other parts in the hoistway, causing an adverse effect.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

[0008] Therefore, the object of the present invention is to provide an elevator hoisting machine that makes it easy to detect oil leaks when an oil discharge channel is provided, and that prevents oil from being scattered in the hoistway. [Means for solving the problem]

[0009] The elevator hoisting machine of the present invention comprises a stationary part having a stator, a rotatable rotating part having a rotor positioned opposite the stator, a sheave that rotates by the rotation of the rotating part, a bearing that rotatably supports the rotating part with respect to the stationary part, and an oil drain pipe for guiding oil leaked from the bearing, wherein the hoisting machine is provided so as to be close to the rear wall surface of the elevator shaft, and the oil drain pipe is provided with an inlet at a position to receive oil leaked from the bearing, and is arranged such that the received oil is guided toward the wall surface of the elevator shaft and the outlet is located at the lower end extending downward of the hoisting machine.

[0010] According to the present invention, oil leaking from the bearing can be guided to the bottom of the hoisting machine via an oil drain pipe. This makes the oil visible below the hoisting machine, making it easier for workers to detect oil leaks even when viewing from the front. Furthermore, since the received oil is guided to the wall side rather than the front side of the hoistway, the leaked oil is less likely to be scattered in the hoistway.

[0011] Furthermore, in the elevator hoisting machine of the present invention, an oil tray may be provided facing downward with respect to the outlet of the oil drain pipe.

[0012] As described above, by providing an oil tray, spilled oil can be collected in the tray without dripping down the drain.

[0013] Furthermore, in the elevator hoisting machine of the present invention, a guide portion may be provided facing the inlet of the oil drain pipe, and the guide portion may include a pointed portion provided on the rotating portion side and a guide portion provided on the stationary portion side opposite to the pointed portion, having a slope for receiving the oil moving by the centrifugal force due to the rotation of the rotating portion and guiding it to the inlet of the oil drain pipe.

[0014] As described above, by providing a guide section with a slope formed to receive the oil moving due to the centrifugal force caused by the rotation of the rotating part and guide it to the inlet of the oil drain pipe, it is easier to guide the leaked oil to the inlet of the oil drain pipe. [Effects of the Invention]

[0015] The present invention provides an elevator hoisting machine that makes it easier to detect oil leaks when an oil discharge channel is provided, and prevents oil from being scattered into the hoistway, by arranging the oil discharge pipe so that its inlet is located at a position to receive oil leaking from the bearing, and the received oil is guided towards the wall surface of the hoistway before the outlet is located at the lower end that extends downwards to the hoisting machine. [Brief explanation of the drawing]

[0016] [Figure 1] This is a rear view of the elevator hoisting machine of the present invention. [Figure 2] A longitudinal cross-sectional view of the hoisting machine. [Figure 3] This is an enlarged view of the main part of Figure 2. [Figure 4] This is an enlarged view of IV in Figure 3. [Modes for carrying out the invention]

[0017] Hereinafter, an embodiment of the elevator hoisting machine according to the present invention will be described with reference to the drawings. The hoisting machine is equipped with a rotatable sheave (not shown) around which a rope (not shown) for suspending a cage and a counterweight (neither shown) for carrying people and luggage is wound. The hoisting machine 1 is located above, below, or inside the elevator shaft through which the cage moves up and down. In Figure 2, the left-right direction of the paper is considered the front-back direction (front side is the front side, rear side is the back side), the up-down direction of the paper is considered the up-down direction, and the direction passing through the paper is considered the left-right direction.

[0018] As shown in Figure 2, the hoisting machine 1 is installed so as to be close to the rear wall G of the elevator shaft S. Installing the hoisting machine 1 so as to be close to the rear wall G of the elevator shaft S means that the hoisting machine 1 is so close to the rear wall G of the elevator shaft S that the rear side of the hoisting machine 1 is difficult to see. Specifically, the hoisting machine 1 comprises a fixed part 2 fixed to a floor surface or the like (not shown), a rotating part 3 rotatable relative to the fixed part 2, a sheave that rotates due to the rotation of the rotating part 3, a bearing 5 that rotatably supports the rotating part 3 relative to the fixed part 2, an oil drain pipe 6 for guiding oil (base oil separated from grease) that leaks out axially from the bearing 5, and two braking parts 7 (see Figure 1) for braking the sheave.

[0019] The fixing part 2 includes, for example, a fixing-side main body part 21 that is fixed to the floor surface or the like, and a fixing shaft part 22 that protrudes from approximately the center of the fixing-side main body part 21 in the vertical direction to one side in the axial direction (the front side in Figure 2).

[0020] The fixed-side main body 21 is made of a metal material. As shown in FIG. 2, it includes a first cylindrical portion 211 formed to project radially outward from the axially other end portion (the rear end portion in FIG. 2) of the fixed shaft portion 22, a first peripheral wall portion 212 extending radially outward from one axially end portion (the front end portion in FIG. 2) of the first cylindrical portion 211, a second cylindrical portion 213 extending axially from the outer peripheral edge of the first peripheral wall portion 212 to the axially other end portion (the rear end portion in FIG. 2) and constituting a stator, a second peripheral wall portion 214 extending radially outward from the axially other end portion (the rear end portion in FIG. 2) of the second cylindrical portion 213, a third cylindrical portion 215 extending axially from the outer peripheral edge of the second peripheral wall portion 214 to one axially end portion (the front end portion in FIG. 2), and a pair of leg portions 216, 216 (see FIG. 1) extending downward from the outer peripheral surface of the third cylindrical portion 215. A coil 213M is wound around the radially outer surface of the second cylindrical portion 213. In FIG. 1, a concave groove 214M extending in the vertical direction for accommodating the vertical pipe portion 6b of the drain pipe 6 to be described later is formed at the lower part of the second peripheral wall portion 214 and at the center in the left-right direction of FIG. 1. In this embodiment, the fixed-side main body 21 and the fixed shaft portion 22 are integrated, but the fixed-side main body 21 and the fixed shaft portion 22 may be formed separately and the separately formed fixed-side main body 21 and fixed shaft portion 22 may be connected.

[0021] The rotating portion 3 is made of a metal material. As shown in FIG. 2, it includes a cylindrical portion 31 externally fitted to the bearing 5, a disk-shaped plate portion 32 extending radially outward from the axially other end portion (the rear end portion in FIG. 2) of the cylindrical portion 31, and a cylindrical rotor 33 extending axially from the outer peripheral edge of the plate portion 32 to the axially other end side (the rear end side in FIG. 2). The rotor 33 includes a plurality of permanent magnets 33A spaced in the circumferential direction. When the coil 213M of the second cylindrical portion (stator) 213 is energized, the rotor 33 rotates and the chain wheel attached to the cylindrical portion 31 rotates. The rotor 33 having the permanent magnets 33A and the stator (the second cylindrical portion 213) having the coil 213M constitute a motor. In this embodiment, an outer-rotor type motor is used, but an inner-rotor type motor may also be used.

[0022] As shown in FIGS. 2 and 3, the bearing 5 is provided with a plurality (two in this embodiment) in the axial direction and is arranged in a positioned state between the outer peripheral surface of the fixed shaft portion 22 and the inner peripheral surface of the cylindrical portion 31 of the rotating portion 3. The bearing 5 includes a first bearing 51 located on one end side (front side) in the axial direction and a second bearing 52 located on the other end side (rear side) in the axial direction. The bearing 5 can be composed of at least one of, for example, a self-aligning roller bearing, a ball bearing, and a tapered bearing, and the number and specific configuration of the bearing 5 are not limited.

[0023] As shown in FIG. 3, the cover member 10 includes a front plate portion 101 having a circular outer shape, a cylindrical portion 102 extending rearward from the outer peripheral edge of the front plate portion 101, and an annular portion 103 that protrudes radially outward from the rear end of the cylindrical portion 102 and protrudes rearward from a substantially central portion in the circumferential direction of the rear end surface and abuts against the first bearing 51. An encoder 13 for measuring the rotational speed of the wire reel is provided at the central portion inside the front plate portion 101 of the cover member 10.

[0024] The annular portion 103 includes an annular recess 103C formed so as to recess forward in the axial direction from the rear end surface 103B on the radially inner side. This recess 103C forms a guide flow path R for guiding the oil leaked from the first bearing 51 radially inward between the front end surface 22A of the fixed shaft portion 22. By forming this recess 103C, an annular convex portion 103D for pressing the oil adsorption sheet 15 described later is formed on the radially inner side of the recess 103C.

[0025] In addition, a plurality (two in FIG. 2) of circular first openings 101K are formed in the circumferential direction in the circular front plate portion 101 of the cover member 10. These first openings 101K are used not only for inserting the screw B1, which is another component constituting the hoisting machine, to fix the main body portion 13B of the encoder 13 to the fixed shaft portion 22, but also as an opening for visually recognizing the oil adsorption sheet 15 described later.

[0026] The braking unit 7 consists of two electromagnetic brakes (see Figure 1) that apply braking to the rotor 33 by switching from an unbraked state, where they are separated from the outer surface of the rotor 33, to a braking state, where they press against the outer surface of the rotor 33 to apply braking.

[0027] The two bearings 51 and 52 are sealed with, for example, grease for lubrication. This grease consists of a base oil, a thickener, additives, etc. Over time, a phenomenon occurs in which the liquid base oil gradually separates from the grease.

[0028] As a result of this phenomenon, the liquid base oil (hereinafter simply referred to as "oil") released may leak out from the bearings 51 and 52, and this leaked oil may contaminate the machine room and elevator shaft outside the hoisting machine. It may also get into the brake section of the hoisting machine and interfere with braking. Therefore, as shown in Figure 3, the oil leaking from the axially outer (front) side of the first bearing 51 accumulates in the annular space C between the rear end surface 103B of the annular portion 103 of the cover member 10 and the front end surface 51A of the first bearing 51. The accumulated oil attempts to move radially inward and outward as the rotating part 3 and the cover member 10 rotate. Oil attempting to move radially outward is prevented from moving radially outward by a sealing member 14 that seals the space between the front end surface 31A of the cylindrical portion 31 of the rotating portion 3 and the rear end surface 103b of the annular portion 103 of the cover member 10, which is radially outside the convex portion 103A. This prevents oil leaking from the first bearing 51 from being discharged to the outside of the hoisting machine 1. The sealing member 14 is housed in an annular groove 10M formed in the cover member 10, but it may also be housed in an annular groove formed in the cylindrical portion 31. Oil attempting to move radially inward is absorbed by an oil-absorbing sheet 15 made of felt or the like, housed in an annular groove 22M formed at the front end of the fixed shaft portion 22 of the fixed portion 2, preventing oil leaking from the first bearing 51 from being discharged to the outside of the hoisting machine 1. The oil-absorbing sheet 15 is positioned by the aforementioned convex portion 103D. Furthermore, the oil guided radially inward by the guide channel R is guided by the outer circumferential surface 103d of the aforementioned protrusion 103D to the oil adsorption sheet 15 located on the axial rear side, and is reliably adsorbed by the oil adsorption sheet 15. The oil adsorption sheet 15 is housed in an annular groove 22M formed in the fixed shaft portion 22, but an annular groove may be formed in the cover member 10 and the oil adsorption sheet 15 may be housed in that groove.

[0029] On the other hand, oil leaking from the second bearing 52 outward (rear) in the axial direction (base oil separated from the grease) is guided by an oil drain pipe 6 made of resin, for example, to the rear side of the elevator shaft S. This guides the received oil to the wall side of the elevator shaft S rather than the front side, making it less likely for oil leaking from the second bearing 51 to be scattered in the elevator shaft S. Furthermore, as shown in Figure 2, the oil drain pipe 6 is positioned so that its inlet 6A receives the oil leaking from the second bearing 52 outward in the axial direction, guides the received oil to the rear side of the elevator shaft S, and then has an outlet 6B at its lower end, which extends downward. This allows the oil to be seen below the hoisting machine 1, making it easier for workers to detect oil leaks even when viewed from the front. The oil drain pipe 6 comprises a horizontal pipe section 6a extending horizontally from the inlet 6A, and a vertical pipe section 6b that bends 90° from the rear end of the horizontal pipe section 6a and extends downward. In this embodiment, the rear end of the horizontal pipe section 6a is bent at approximately 90°, but the horizontal pipe section 6a may also have a curved section that curves in an arc shape with a predetermined radius of curvature, or the horizontal pipe section 6a may have a diagonal straight section that is located lower towards the rear.

[0030] As shown in Figure 4, a threaded portion 6N is formed on the outer circumference of the inlet end of the oil drain pipe 6, which screws into a threaded hole 212N formed through the first peripheral wall portion 212 of the fixing portion 2, and the inlet end of the oil drain pipe 6 is connected to the threaded hole 212N of the first peripheral wall portion 212 by screwing. If the oil drain pipe 6 is made up of a single pipe, it is difficult to screw the threaded portion 6N into the threaded hole 212N, so for example, the oil drain pipe 6 may be made up of two parts: a tip portion in which a threaded portion 6N that screws into the threaded hole 212N is formed, and a base portion that can be connected to the screwed tip portion. Also, as shown in Figure 2, an oil receiver 16 is provided facing downwards with respect to the outlet 6B of the oil drain pipe 6. The oil receiver 16 is made up in a box shape with the top open and is attached to a stand (not shown) for fixing the hoisting machine 1.

[0031] As shown in Figure 3, the oil leaking from the second bearing 52 moves into an annular first space K1 formed axially between the outer circumferential surface 211A of the axial end (front end) of the first cylindrical portion 211 of the fixed portion 2 and the inner circumferential surface 31B of the other axial end (rear end) of the cylindrical portion 31 of the rotating portion 3. The oil that has moved into the first space K1 then moves from the rear end of the first space K1 into a second space K2 formed radially between the front end surface 212A of the first circumferential wall portion 212 and the rear end surface 31C of the cylindrical portion 31 of the rotating portion 3. The oil that has moved into the second space K2 is guided to the inlet 6A of the drain pipe 6 via the guide portion 17, which will be described later, and then collected in the oil receiver 16 through the outlet 6B of the drain pipe 6.

[0032] As shown in Figures 3 and 4, the oil that has moved to the second space K2 is guided to the inlet 6A of the drain pipe 6 via the guide section 17. The guide section 17 is provided in an annular shape facing the front of the inlet 6A of the drain pipe 6, with the central axis of the fixed shaft section 22 as the reference. The guide section 17 includes an annular pointed portion 18 provided on the rotating portion 3 side, and an annular guide portion 19 provided on the fixed portion 2 side opposite the pointed portion 18, which has an inclined surface 19A for receiving the oil moving due to the centrifugal force caused by the rotation of the rotating portion 3 and guiding it to the inlet 6A of the drain pipe 6.

[0033] As shown in Figure 4, the pointed portion 18 is formed by tapering the outer circumferential edge of the rear end of the cylindrical portion 31 of the rotating portion 3 towards the tip. The oil, which is moved by the centrifugal force generated by the rotation of the rotating portion 3, is concentrated at the tip of the pointed portion 18 and ejected radially outward as oil droplets (see the oil droplets depicted in Figure 4). The cross-sectional shape of the pointed portion 18 is a roughly right-angled trapezoid formed by the vertical rear end surface 31C of the cylindrical portion 31 of the rotating portion 3, the tip surface 31D extending forward from the front end of the rear end surface 31C in a direction parallel to the axial direction, and the inclined surface 31E which is located further forward from the front end of the tip surface 31D, but other shapes are also possible. In addition, the pointed portion 18 is formed so that the tip surface 31D is located radially inward from the inlet 6A of the oil drain pipe 6.

[0034] The guide portion 19 is located radially outward from the pointed portion 18 and consists of an annular projection that protrudes forward from the front end surface 212A of the first circumferential wall portion 212 of the fixed portion 2. The inclined surface 19A formed on the guide portion 19 is an inclined surface that is radially outward towards the rear end. This inclined surface 19A guides the oil to the inlet 6A of the oil drain pipe 6. The guide portion 19 is formed such that the front end of the inclined surface 19A of the guide portion 19 is located further forward than the front end of the pointed portion 18, so that the oil moving from the pointed portion 18 can be reliably received by the inclined surface 19A.

[0035] In the hoisting machine 1 with the above configuration, oil leaking from the first bearing 51 that moves radially outward is prevented from being discharged to the outside of the hoisting machine 1 by the sealing member 14. In addition, oil leaking from the first bearing 51 that moves radially inward is absorbed by the oil absorbent sheet 15, thereby preventing the oil leaking from the first bearing 51 from being discharged to the outside of the hoisting machine 1. The amount of oil absorbed by the oil absorbent sheet 15 is checked periodically, for example, through the first opening 101K, to determine whether it is time to replace the oil absorbent sheet 15. If it is time to replace it, the cover member 10 is removed and the oil absorbent sheet 15 is replaced.

[0036] Furthermore, oil leaking from the second bearing 52 is either thrown by the rotation of the rotating part 3 or falls due to its own weight when the rotation of the rotating part 3 stops, and is caught by the inclined surface 19A of the guide part 19. As shown in Figure 4, the caught oil is collected on the curved surface 19B connected to the inclined surface 19A, then guided by the inclined surface 19C to the inlet 6A of the drain pipe 6, and discharged from the outlet 6B of the drain pipe 6 and stored in the oil receiver 16. In addition, some of the oil is reflected by the inclined surface 19A and enters the inlet 6A of the drain pipe 6 directly.

[0037] The present invention can be modified in various ways without departing from its spirit. Furthermore, the specific configuration of each part is not limited to the embodiments described above.

[0038] In the above embodiment, only the oil leaking from one bearing 52 was guided by the drain pipe 6, but it is also possible to configure the system so that the oil leaking from the other bearing 51 is also guided by a separate drain pipe.

[0039] Furthermore, although an oil tray 16 was provided in the above embodiment, it may be omitted. [Explanation of Symbols]

[0040] 1...Hoisting machine, 2...Fixed part, 3...Rotating part, 5...Bearing, 6...Oil drain pipe, 6A...Inlet, 6B...Outlet, 6N...Screw part, 6a...Horizontal pipe part, 6b...Vertical pipe part, 7...Brake part, 8...Connecting member, 9...Positioning member, 10...Cover member, 10M...Recessed groove, 11...Bending washer, 12...Positioning member, 13...Encoder, 13A...Rotating shaft, 13B...Main body part, 14...Sealing member, 15...Oil absorbent sheet, 17...Guiding part, 18...Pointed part, 19...Guiding part, 19A...Sloping surface, 19B...Curved surface, 19C...Inclined surface, 21...Fixed side main body part, 22...Fixed shaft part, 22A...Front end surface, 22M...Groove, 31...Cylindrical part, 31A...Front end surface, 31A,31B... Stepped section, 31B...Inner circumferential surface, 31C...Rear end surface, 31D...Front end surface, 31E...Inclined surface, 32...Plate section, 33...Rotor, 33A...Permanent magnet, 51...First bearing, 51A...Front end surface, 52...Second bearing, 101...Front plate section, 101A...Connecting section, 102...Cylindrical section, 103...Annular section, 103A...Convex section, 103B...Rear end surface, 103C...Concave section, 103D...Convex section, 103b...Rear end surface, 103d...Outer circumferential surface, 211A...Outer circumferential surface, 212A...Front end surface, 212N...Screw hole, 213...Second cylindrical section (stator), 213M...Coil, 214M...Groove, 216...Leg section, B1...Screw, B2...Bolt, C...Space, G...Wall surface, R...Guide channel, S...Elevator

Claims

1. An elevator hoisting machine comprising: a stationary part having a stator; a rotatable rotating part having a rotor positioned opposite the stator; a sheave that rotates by the rotation of the rotating part; a bearing that rotatably supports the rotating part relative to the stationary part; and an oil drain pipe for guiding oil leaking from the bearing, The hoisting machine is installed so as to be close to the rear wall of the elevator shaft, and the drain pipe is arranged such that its inlet is located at a position to receive oil leaking from the bearing, and the received oil is guided towards the wall of the elevator shaft before its outlet is located at the lower end of the hoisting machine.

2. The elevator hoisting machine according to claim 1, wherein an oil tray is provided facing downward with respect to the outlet of the oil drain pipe.

3. A guide section is provided facing the inlet of the aforementioned oil drain pipe. The elevator hoisting machine according to claim 1 or 2, wherein the guide portion comprises a pointed portion provided on the rotating portion side, and a guide portion provided on the stationary portion side so as to be opposite to the pointed portion, and having a slope for receiving oil moving from the pointed portion by the centrifugal force due to the rotation of the rotating portion and guiding it to the inlet of the oil drain pipe.

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