Elevator hoist

Abstract

To provide an elevator hoisting machine which makes it easy to find oil leakage when an oil discharge path is provided and prevents oil from scattering in a hoistway. [Solution] An elevator hoist comprising: a fixed part 2 having a stator 213; a rotatable rotating part 3 having a rotor 33 arranged opposite the stator 213; 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; and an oil drain pipe 6 for guiding oil leaked from the bearing 5, wherein the hoist is arranged close to the wall G on the back side of the elevator shaft S, and the oil drain pipe 6 is arranged so that its inlet 6A is located at a position to receive oil leaked from the bearing 5 and its outlet 6B is located at the lower end extending downward from the hoist.

Description

[Technical Field]

[0001] The present invention relates to an elevator hoist. [Background technology]

[0002] The elevator hoist is equipped with a sheave for suspending the car and counterweight via a rope. To rotate the sheave, a bearing is provided between the rotating part of the hoist and the fixed part that supports the rotating part. Grease, for example, is sealed inside the bearing for lubrication. This grease is composed of base oil, thickener, additives, etc. Over time, a phenomenon occurs in which the liquid base oil gradually separates from the grease.

[0003] The liquid base oil that separates from the hoisting machine due to this phenomenon can leak out of the bearings, and this leaked base oil can contaminate the machine room and elevator shaft outside the hoisting machine.It can also find its way into the brake of the hoisting machine and interfere with braking.

[0004] One possible solution to this problem is to provide an oil drainage path on the back side of the hoist and drain the base oil from the drainage path.

[0005] However, it may be difficult to see the back side of the hoist because there is a wall of the elevator shaft behind the hoist, which may result in the oil leak being discovered late and making it impossible to respond appropriately.

[0006] On the other hand, Patent Document 1 shows a structure in which an oil discharge path is provided using a tubular member, but because the structure guides the oil to the front side of the hoisting machine, the guided oil may splash and adhere to other parts of the elevator shaft, causing adverse effects. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2021-127224 Summary of the Invention [Problem to be solved by the invention]

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

[0009] The elevator hoist of the present invention is an elevator hoist comprising: a fixed part having a stator; a rotatable rotating part having a rotor arranged 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 fixed part; and an oil drain pipe for guiding oil leaked from the bearing, wherein the hoist is arranged close to the wall surface on the back side of the elevator shaft; and the oil drain pipe is arranged so that its inlet is located in a position to receive oil leaked from the bearing and its outlet is located at the lower end extending below the hoist.

[0010] According to the present invention, oil leaking from the bearing can be guided below the hoist using an oil drain pipe. This makes it possible to see the oil below the hoist, making it easier for workers to spot oil leaks even when looking from the front. In addition, because the received oil is guided toward the wall side of the hoistway rather than the front side, the leaked oil is less likely to scatter throughout the hoistway.

[0011] In the elevator hoist of the present invention, an oil pan may be provided facing downward from the outlet of the oil drain pipe.

[0012] By providing the oil pan as described above, leaked oil can be received in the oil pan without being allowed to drip.

[0013] Furthermore, in the elevator hoist of the present invention, a guide section may be provided facing the entrance of the oil drain pipe, and the guide section may include a pointed section provided on the rotating section side, and a guide section provided on the fixed section side opposite the pointed section, having a slope for receiving oil that moves due to centrifugal force caused by rotation of the rotating section and guiding it to the entrance of the oil drain pipe.

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

[0015] The present invention provides an elevator hoist that makes it easy to detect oil leaks when an oil drain path is provided and prevents oil from scattering in the hoistway, by arranging an oil drain pipe so that its inlet is located at a position where it receives oil leaking from a bearing and guides the received oil toward the wall surface of the hoistway, and then its outlet is located at the lower end that extends downward from the hoistway. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a rear view of the elevator hoist of the present invention. [Figure 2] FIG. [Figure 3] FIG. 3 is an enlarged view of a main part of FIG. 2. [Figure 4] FIG. 4 is an enlarged view of IV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of an elevator hoist according to the present invention will be described below with reference to the drawings. The hoist is provided with a rotatable sheave (not shown) around which a rope (not shown) is wound for suspending a car carrying passengers and cargo and a counterweight (neither of which are shown). The hoist 1 is disposed above or below a hoistway through which the car ascends and descends, or within the hoistway. In the following description, the left-right direction of the paper in Figure 2 is defined as the front-to-back direction (the front side is the front side, and the rear side is the rear side), the up-down direction of the paper is defined as the up-down direction, and the direction penetrating the paper is defined as the left-to-right direction.

[0018] As shown in Fig. 2, the hoisting machine 1 is provided so as to be close to the wall surface G on the back side (rear side) of the hoistway S. Providing the hoisting machine 1 so as to be close to the wall surface G on the back side of the hoistway S means that the hoisting machine 1 is provided so close to the wall surface G on the back side of the hoistway S that the back side of the hoisting machine 1 is difficult to see. Specifically, the hoisting machine 1 includes 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 leaking outward in the axial direction from the bearing 5 (base oil separated from the grease), and two braking parts 7 (see Fig. 1) for braking the sheave.

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

[0020] The fixed side main body portion 21 is made of a metal material and, as shown in Figure 2, is provided with a first cylindrical portion 211 formed to protrude radially outward from the other axial end (rear end in Figure 2) of the fixed shaft portion 22, a first circumferential wall portion 212 extending radially outward from one axial end (front end in Figure 2) of the first cylindrical portion 211, a second cylindrical portion 213 extending from the outer peripheral edge of the first circumferential wall portion 212 to the other axial end (rear end in Figure 2) and constituting a stator, a second circumferential wall portion 214 extending radially outward from the other axial end (rear end in Figure 2) of the second cylindrical portion 213, a third cylindrical portion 215 extending from the outer peripheral edge of the second circumferential wall portion 214 to one axial end (front end in Figure 2), and a pair of legs 216, 216 (see Figure 1) extending downward from the outer peripheral surface of the third cylindrical portion 215. A coil 213M is wound around the radial outer surface of the second cylindrical portion 213. In Fig. 1, a recessed groove 214M extending in the vertical direction for accommodating a vertical pipe portion 6b of an oil drain pipe 6 (described later) is formed in the lower part of the second circumferential wall portion 214 and in the center in the left-right direction in Fig. 1. In this embodiment, the fixed side main body portion 21 and the fixed shaft portion 22 are integrated, but the fixed side main body portion 21 and the fixed shaft portion 22 may be formed separately and then connected to each other.

[0021] The rotating unit 3 is made of a metal material and, as shown in FIG. 2, includes a cylindrical portion 31 fitted onto the bearing 5, a disk-shaped plate portion 32 extending radially outward from the other axial end (rear end portion in FIG. 2) of the cylindrical portion 31, and a cylindrical rotor 33 extending from the outer periphery of the plate portion 32 toward the other axial end (rear end portion in FIG. 2). The rotor 33 includes a plurality of permanent magnets 33A spaced apart in the circumferential direction. When a current is applied to the coil 213M of the second cylindrical portion (stator) 213, the rotor 33 rotates, and the sheave attached to the cylindrical portion 31 also rotates. The rotor 33 having the permanent magnets 33A and the stator (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] 2 and 3, a plurality of bearings 5 ​​(two in this embodiment) are provided in the axial direction and are positioned 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 bearings 5 ​​include a first bearing 51 located at one axial end (front side) and a second bearing 52 located at the other axial end (rear side). The bearings 5 ​​can be configured with at least one type of bearing selected from the group consisting of a self-aligning roller bearing, a ball bearing, and a tapered bearing, and the number and specific configuration of the bearings 5 ​​are not limited.

[0023] 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 periphery of the front plate portion 101, and a circumferentially continuous disk-shaped annular portion 103 that protrudes radially outward from the rear end of the cylindrical portion 102 and protrudes rearward from approximately the circumferential center of the rear end face to abut against the first bearing 51. An encoder 13 for measuring the rotation speed of the sheave is provided at the center inside the front plate portion 101 of the cover member 10.

[0024] The annular portion 103 has an annular recess 103C formed so as to recess axially forward from a radially inner rear end face 103B. This recess 103C forms a guide flow path R between itself and the front end face 22A of the fixed shaft portion 22 for guiding oil leaking from the first bearing 51 radially inward. By forming this recess 103C, an annular protrusion 103D for pressing an oil absorbent sheet 15 (described later) is formed radially inward of the recess 103C.

[0025] Furthermore, a plurality of (two in FIG. 2) 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 to insert the screws B1, which are other components that make up the hoist, to fix the main body portion 13B of the encoder 13 to the fixed shaft portion 22, and are also used as openings for visually observing the oil adsorbent sheet 15, which will be described later.

[0026] The braking unit 7 is composed of two electromagnetic brakes (see Figure 1) that apply braking force to the rotor 33 by switching from a non-braking state in which it is spaced apart from the outer circumferential surface of the rotor 33 to a braking state in which it presses against the outer circumferential surface of the rotor 33 to brake it.

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

[0028] The liquid base oil (hereinafter simply referred to as oil) that has separated due to this phenomenon may leak from the bearings 51 and 52, and this leaked oil may contaminate the machine room or elevator shaft outside the hoist. It may also find its way into the brake section of the hoist and interfere with braking. Therefore, oil that leaks from the axially outer side (front side) of the first bearing 51 accumulates in the annular space C between the rear end surface 103B of the annular section 103 of the cover member 10 and the front end surface 51A of the first bearing 51, as shown in FIG. 3. The accumulated oil tends to move radially inward and outward as the rotating section 3 and the cover member 10 rotate. Oil attempting to move radially outward is prevented from moving radially outward by a seal member 14 that seals between the front end surface 31A of the cylindrical portion 31 of the rotating unit 3 and the opposing rear end surface 103b of the rear end surface 103B of the annular portion 103 of the cover member 10, which is radially outward of the convex portion 103A, thereby preventing oil leaking from the first bearing 51 from being discharged to the outside of the hoist 1. The seal member 14 is accommodated in an annular groove 10M formed in the cover member 10, but an annular groove may also be formed in the cylindrical portion 31 and the seal member 14 may be accommodated in that groove. In addition, oil attempting to move radially inward is absorbed by an oil absorbent sheet 15 made of felt or the like that is accommodated in an annular groove 22M formed in the front end of the fixed shaft portion 22 of the fixed unit 2, thereby preventing oil leaking from the first bearing 51 from being discharged to the outside of the hoist 1. The oil absorbent sheet 15 is positioned by the aforementioned convex portion 103D. Furthermore, the oil guided radially inward by the guide flow path R is guided by the outer peripheral surface 103d of the convex portion 103D to the oil adsorbent sheet 15 located axially rearward, and is reliably adsorbed by the oil adsorbent sheet 15. The oil adsorbent sheet 15 is accommodated in the annular groove 22M formed in the fixed shaft portion 22, but it may also be accommodated in an annular groove formed in the cover member 10.

[0029] Meanwhile, oil leaking from the axially outer side (rear side) of the second bearing 52 (base oil separated from the grease) is guided by an oil drain pipe 6 made of, for example, resin and directed toward the rear side of the hoistway S. This guides the received oil toward the wall side of the hoistway S rather than the front side, making it less likely that oil leaking from the second bearing 51 will scatter into the hoistway S. As shown in FIG. 2 , the oil drain pipe 6 is positioned so that its inlet 6A receives oil leaking from the second bearing 52 toward the axially rear side, and its outlet 6B is located at its lower end, extending downward after directing the received oil toward the rear side of the hoistway S. This allows oil to be visually observed below the hoisting machine 1, making it easy for workers to detect oil leaks even when viewed from the front side. The oil drain pipe 6 includes a horizontal pipe section 6a extending horizontally from the inlet 6A and a vertical pipe section 6b bending 90° from the rear end of the horizontal pipe section 6a and extending downward. In this embodiment, the rear end of the horizontal pipe section 6a in the horizontal direction is bent at approximately 90°, but the horizontal pipe section 6a may also have a curved section that is curved in an arc shape with a predetermined radius of curvature, or the horizontal pipe section 6a may have an oblique straight section that is positioned downward as it approaches the rear.

[0030] As shown in FIG. 4, a threaded portion 6N is formed on the outer periphery of the inlet end of the oil drain pipe 6. The threaded portion 6N is threaded into a threaded hole 212N formed through the first peripheral wall portion 212 of the fixed 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 threading. If the oil drain pipe 6 is formed from a single pipe, it is difficult to thread the threaded portion 6N into the threaded hole 212N. Therefore, for example, the oil drain pipe 6 may be formed from two parts: a tip end portion formed with the threaded portion 6N that is threaded into the threaded hole 212N, and a base end portion connectable to the threaded tip end portion. Also, as shown in FIG. 2, an oil pan 16 is provided facing downward from the outlet 6B of the oil drain pipe 6. The oil pan 16 is configured in a box shape with an open top, and is attached to a stand (not shown) or the like that fixes the hoist 1.

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

[0032] 3 and 4, the oil that has moved to the second space K2 is guided to the inlet 6A of the oil drain pipe 6 via the guide portion 17. The guide portion 17 is provided in an annular shape facing the front of the inlet 6A of the oil drain pipe 6 and based on the central axis of the fixed shaft portion 22. The guide portion 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 so as to face the pointed portion 18 and having a slope 19A for receiving oil that moves due to centrifugal force caused by rotation of the rotating portion 3 and guiding (guiding) the oil to the inlet 6A of the oil drain pipe 6.

[0033] As shown in FIG. 4, the pointed portion 18 is configured as a pointed shape that tapers toward the tip end of the outer peripheral edge of the rear end of the cylindrical portion 31 of the rotating portion 3. Oil moving due to centrifugal force generated by the rotation of the rotating portion 3 is collected at the tip of the pointed portion 18 and forms oil droplets that are scattered radially outward (see the oil droplets depicted in FIG. 4). The cross-sectional shape of the pointed portion 18 is configured as a substantially right-angled trapezoid formed by a vertical rear end surface 31C of the cylindrical portion 31 of the rotating portion 3, a front end surface 31D extending forward from the front end of the rear end surface 31C in parallel with the axial direction, and an inclined surface 31E positioned forward from the front end of the front end surface 31D. However, other shapes may be used. The pointed portion 18 is also configured so that the front end surface 31D is located radially inward of the inlet 6A of the oil drain pipe 6.

[0034] The guide portion 19 is located radially outward of the pointed portion 18 and is configured as an annular protrusion that protrudes forward from the front end surface 212A of the first peripheral wall portion 212 of the fixed portion 2. The inclined surface 19A formed on the guide portion 19 is an inclined surface that is positioned radially outward as it approaches the rear end. This inclined surface 19A guides oil to the inlet 6A of the oil drain pipe 6. The guide portion 19 is formed so 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, ensuring that the oil moving from the pointed portion 18 can be reliably received by the inclined surface 19A.

[0035] In the hoist 1 configured as described above, of the oil leaking from the first bearing 51, the oil that moves radially outward is prevented by the seal member 14 from being discharged to the outside of the hoist 1. Furthermore, of the oil leaking from the first bearing 51, the oil that moves radially inward is absorbed by the oil absorbing sheet 15, thereby preventing the oil leaking from the first bearing 51 from being discharged to the outside of the hoist 1. By checking the amount of oil absorbed by the oil absorbing sheet 15, for example, periodically through the first opening 101K, it is determined whether it is time to replace the oil absorbing sheet 15, and if it is time to replace it, the cover member 10 is removed and the oil absorbing sheet 15 is replaced.

[0036] Furthermore, oil leaking from the second bearing 52 is either splashed by the rotation of the rotating part 3 or falls under its own weight when the rotation of the rotating part 3 stops, and is received by the inclined surface 19A of the guide part 19. As shown in Fig. 4, the received oil is collected by the curved surface 19B connected to the inclined surface 19A, and then guided by the inclined surface 19C to the inlet 6A of the oil drain pipe 6, where it is discharged from the outlet 6B of the oil drain pipe 6 and collected in the oil pan 16. Furthermore, some of the oil is reflected by the inclined surface 19A and directly enters the inlet 6A of the oil drain pipe 6.

[0037] The present invention can be modified in various ways without departing from the spirit and scope of the invention. The specific configurations of the various parts are not limited to the above-described embodiments.

[0038] In the above embodiment, only the oil leaking from one bearing 52 is guided by the oil drain pipe 6, but it may be configured so that the oil leaking from the other bearing 51 is also guided by a separate oil drain pipe.

[0039] In the above embodiment, the oil pan 16 is provided, but 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...threaded part, 6a...horizontal pipe part, 6b...vertical pipe part, 7...braking part, 8...connecting member, 9...positioning member, 10...cover member, 10M...groove, 11...bent washer, 12...positioning member, 13...encoder, 13A...rotating shaft, 13B...main body part, 14...sealing member, 15...oil absorbing sheet, 17...guiding part, 18...pointed part, 19...guiding part, 19A...inclined 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... Step portion, 31B...inner peripheral surface, 31C...rear end surface, 31D...front end surface, 31E...inclined surface, 32...plate portion, 33...rotor, 33A...permanent magnet, 51...first bearing, 51A...front end surface, 52...second bearing, 101...front plate portion, 101A...connecting portion, 102...cylindrical portion, 103...annular portion, 103A...convex portion, 103B...rear end surface, 103C...recessed portion, 103D...convex portion, 103b...rear end surface, 103d...outer peripheral surface, 211A...outer peripheral surface, 212A...front end surface, 212N...screw hole, 213...second cylindrical portion (stator), 213M...coil, 214M...recessed groove, 216...leg portion, B1...screw, B2...bolt, C...space, G...wall surface, R...guide channel, S...hoistway

Claims

1. An elevator hoist comprising: a fixed part having a stator; a rotatable rotating part having a rotor arranged opposite to the stator; a sheave that rotates by rotation of the rotating part; a bearing that rotatably supports the rotating part with respect to the fixed part; and an oil drain pipe for guiding oil leaking from the bearing, The hoist is provided close to a wall surface on the rear side of the hoistway, and the oil drain pipe is provided at a position where an inlet receives oil leaked from the bearing, guides the received oil to the wall surface side of the hoistway, and is arranged so that an outlet is located at a lower end extending downward from the hoist, the fixed portion includes a fixed-side main body portion fixed to a floor surface and a fixed shaft portion protruding from the fixed-side main body portion to a front side opposite to the wall surface, the fixed-side main body portion includes a fixed-side cylindrical portion formed to protrude radially outward from the wall surface side end portion of the fixed shaft portion, and a fixed-side peripheral wall portion extending radially outward from the fixed-side cylindrical portion, the rotating portion includes a rotating portion-side cylindrical portion located radially outward of the fixed shaft portion, the bearing is disposed between an outer peripheral surface of the fixed shaft portion located forward of the fixed-portion-side peripheral wall portion and an inner peripheral surface of the rotating-portion-side cylindrical portion of the rotating portion, The fixed-side main body portion is configured to cantilever-support the sheave via the fixed shaft portion.

2. The fixed portion side peripheral wall portion is connected to a leg portion fixed to a fixed object, a guide portion is provided on the fixed portion side peripheral wall portion facing the inlet of the oil drain pipe, 2. The elevator hoist according to claim 1, wherein the guide portion comprises: a pointed portion provided on the rotating portion side; and a guide portion provided on the fixed portion side opposite the pointed portion, the guide portion having a slope for receiving oil that moves from the pointed portion due to centrifugal force caused by rotation of the rotating portion and guiding it to an inlet of the oil drain pipe.

3. An elevator hoist as described in claim 2, wherein the pointed portion further has an inclined surface extending toward the tip of the pointed portion.

4. The elevator hoist according to any one of claims 1 to 3, wherein an oil pan is provided facing downward from the outlet of the oil drain pipe.

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