Elevator hoisting machine

Abstract

The present invention provides an elevator hoisting machine that can suppress dust from entering the inside of a cover, even when a cover with an opening is used in the area through which the rope passes. [Solution] The present invention comprises a rotating part 3 having a sheave, a fixed part 2 supporting the rotating part 3, a bearing 5 provided between the rotating part 3 and the fixed part 2, and an adsorbent 6 placed in the flow path for oil leaking from the bearing 5. The adsorbent 6 is in the form of a sheet with its thickness direction coinciding with its radial direction, changes in appearance when it absorbs oil, and has an observation hole H that allows the radially facing surface of the adsorbent 6 to be seen from outside the hoisting machine 1.

Description

Technical Field

[0001] The present invention relates to a hoisting machine for 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 (Patent Document 1). 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 base oil, thickener, additives, and the like. Over time, a phenomenon occurs in which the liquid base oil gradually separates from the grease.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=�4]] 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 get into the brake part of the hoisting machine and interfere with braking.

[0005] As a countermeasure, it is conceivable to provide an adsorbent in the path where the base oil flows out. In this case, it is necessary to replace the adsorbent according to the degree of adsorption of the base oil.

[0006] An object of the present invention is to provide a hoisting machine for an elevator that can replace an adsorbent at an appropriate timing.

Means for Solving the Problems

[0007] The elevator hoisting machine of the present invention comprises a rotating part having a sheave, a fixed part supporting the rotating part, a bearing provided between the rotating part and the fixed part, and an adsorbent material placed in the flow path for oil leaking from the bearing, wherein the adsorbent material is in the form of a sheet with its thickness direction coinciding with the radial direction, changes in appearance when it absorbs oil, and has an observation hole that allows the radially facing surface of the adsorbent material to be seen from outside the hoisting machine.

[0008] With this configuration, the state of the adsorbent, which changes in appearance when it absorbs oil, can be checked through an observation hole provided in the hoisting machine, and the adsorbent can be replaced at the appropriate time according to the results.

[0009] In the elevator hoisting machine, the adsorbent material may be annular in shape and provided around the rotation center of the rotating part.

[0010] With this configuration, it is easy to position the annular adsorbent relative to the rotating part.

[0011] In the elevator hoisting machine, an oil collection section may be provided in the rotating section or the stationary section in the portion facing the adsorbent in the vertical direction for collecting oil.

[0012] With this configuration, the oil collection unit can guide the base oil leaking from the bearing to the adsorbent without scattering it. [Effects of the Invention]

[0013] Based on the above, the present invention provides an elevator hoisting machine that can replace the adsorbent material at an appropriate time. [Brief explanation of the drawing]

[0014] [Figure 1] This is a front 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 a front view of an elevator hoisting machine according to a modified example of the present invention. [Figure 5] This is a longitudinal cross-sectional side view of the elevator hoisting machine. [Figure 6] This is an enlarged view of the main part of Figure 5. [Modes for carrying out the invention]

[0015] Hereinafter, an embodiment of the elevator hoisting machine according to the present invention will be described with reference to Figures 1 to 3. The hoisting machine 1 is rotatably equipped with a 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, the up-down direction of the paper is considered the up-down direction, and the direction penetrating the paper is considered the left-right direction, as described below.

[0016] The hoisting machine 1 comprises a rotating part 3 having a sheave, a fixed part 2 supporting the rotating part 3, and a bearing 5 provided between the rotating part 3 and the fixed part 2. The hoisting machine 1 also comprises an adsorbent 6 placed in the flow path R1 for oil (base oil separated from grease) leaking from the bearing 5, as shown in Figure 3. In this embodiment, the hoisting machine 1 is equipped with two braking parts B (see Figure 1) for braking the sheave.

[0017] As shown in Figure 2, the fixing part 2 includes, for example, a fixing side main body 21 that is fixed to the floor surface, and a hollow fixing shaft 22 that extends from approximately the vertical center of the fixing side main body 21 in one axial direction (the front side in Figure 2).

[0018] The fixed-side main body portion 21 is made of a metal material and includes a first cylindrical portion 211 formed to protrude 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 the 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 (see FIG. 2).

[0019] The rotating portion 3 is rotatable with respect to the fixed portion 2. By the rotation of the rotating portion 3, the wire wheel and the rotating portion 3 rotate integrally. Further, the rotating portion 3 is made of a metal material and includes a cylindrical portion 31 that fits externally onto 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).

[0020] The rotor 33 includes a plurality of permanent magnets 33A spaced apart in the circumferential direction. When the coil 213M in the second cylindrical portion (stator) 213 is energized, the rotor 33 rotates and the wire wheel 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.

[0021] The bearing 5 rotatably supports the rotating part 3 with respect to the fixed part 2. Also, 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 part 22 and the inner peripheral surface of the cylindrical part 31 of the rotating part 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.

[0022] The fixed shaft part 22 includes a cylindrical shaft part main body 220 and a shaft part extension part 221 that extends further forward from the front end of the shaft part main body 220. A concave part 222 that is recessed inward in the radial direction is provided at the radially outer end of the shaft part extension part 221 (see FIG. 3). The concave part 222 is provided continuously in a circle around the rotation center axis X of the rotating part 3. The front end part of the concave part 222 is defined by an inclined surface 2220 that is inclined so as to approach the rotation center axis X of the rotating part 3 toward the rear side. The inclined surface 2220 may have a flat surface or a curved surface in the radial cross-sectional shape.

[0023] The cover member 10 includes a front plate part 101 having a circular outer shape, a cylindrical part 102 that extends rearward from the outer peripheral edge of the front plate part 101, and a disc-shaped annular part 103 that protrudes radially outward from the rear end of the cylindrical part 102. As shown in FIG. 2, an encoder 13 for measuring the rotation speed of the wire wheel is provided at the central part inside the front plate part 101 of the cover member 10. The main body part of the encoder 13 is fixed to the fixed shaft part 22 by a plurality (two in FIG. 2) of screws B1.

[0024] The braking part B is composed of an electromagnetic brake (see FIG. 1) that applies braking to the rotor 33 by switching from a non-braking state where it is separated from the outer peripheral surface of the rotor 33 to a braking state where it presses the outer peripheral surface of the rotor 33 to brake.

[0025] In this embodiment, the two bearings 51 and 52 are sealed with, for example, grease for lubrication. This grease is composed of a base oil, a thickener, additives, etc. Over time, a phenomenon occurs in which the liquid base oil gradually separates from the grease.

[0026] As a result of this phenomenon, the liquid base oil that has been separated may leak out from the bearings 51 and 52, and this leaked base oil may contaminate the machine room and elevator shaft outside the hoisting machine 1. It may also seep into the braking section B of the hoisting machine 1 and interfere with braking. To counter this, as shown in Figure 3, an adsorbent 6 is provided in the flow path R1 through which the base oil travels, as described above.

[0027] The adsorbent material 6 is positioned on the fixed part 2, specifically on the fixed shaft part 22. Furthermore, the adsorbent material 6 is positioned axially outward (frontward) from the bearing 5 (first bearing 51). In addition, the adsorbent material 6 is positioned offset vertically from the bearing 5 (first bearing 51).

[0028] Furthermore, the adsorbent 6 is a sheet in which the thickness direction coincides with the radial direction, and its appearance changes when it absorbs oil. For example, when the adsorbent 6 absorbs oil, it changes from a light color to a dark color. The adsorbent 6 can be made of felt fabric, or any material that can absorb oil. For example, the adsorbent 6 may be made of a sponge or a paper cloth.

[0029] In this embodiment, the adsorbent 6 receives oil leaking from the bearings 51 and 52 (oil passing through the flow path R1). Flow path R1 is a flow path from the front end of the first bearing 51 through the fixed shaft portion 22 to the adsorbent 6. The adsorbent 6 also receives oil that adheres to the cover member 10 and drips down (oil passing through the flow path R2). Flow path R2 is a flow path from the front end of the first bearing 51 through the rear end of the annular portion 103 and the rear end of the cylindrical portion 102 of the cover member 10 to the adsorbent 6. Flow path R2 is formed when oil accumulated in a portion of the annular portion 103 located below the rotational axis X moves above the adsorbent 6 as the rotating portion 3 rotates.

[0030] In this embodiment, the adsorbent 6 is positioned in the recess 222 of the shaft extension 221 of the fixed shaft portion 22. The oil adhering to the cover member 10 and dripping (oil passing through the flow path R2) is guided to the adsorbent 6 along the inclined surface 2220.

[0031] The observation holes H are provided in the member of the fixed part 2 and the rotating part 3 on the side where the suction material 6 is provided. In this embodiment, the observation holes H are provided in the fixed part 2. The observation holes H are through holes that extend parallel to the rotational axis X of the rotating part 3, and are round holes. Specifically, multiple (two in Figure 2) round observation holes H are formed in the circumferential direction in the circular front plate portion 101 of the cover member 10 (see Figure 1). In this embodiment, the multiple observation holes H are arranged diagonally. Note that the observation holes H may have other shapes.

[0032] The observation hole H allows the radially facing surface (specifically, radially outward) of the adsorbent material 6 to be visible from outside the hoisting machine 1 (see Figure 2). The observation hole H is also used to insert the screw B1, which is another component of the hoisting machine 1, and fix the main body of the encoder 13 to the fixed shaft 22. In this configuration, the condition of the adsorbent material 6, whose appearance changes when it absorbs oil, can be checked through the observation hole H provided in the hoisting machine 1 (fixed part 2), and the adsorbent material 6 can be replaced at the appropriate time according to the result. In addition, since the hoisting machine 1 has multiple observation holes H, it is possible to select an observation hole H that is easy to see through and observe the adsorbent material 6 from the selected observation hole H. Furthermore, by observing the adsorbent material 6 from multiple observation holes H arranged diagonally, it is easier to observe the condition of the adsorbent material 6. For example, when the hoisting machine 1 is installed in an elevator without a machine room, it may be difficult to adjust to a position that is easy to see in the height direction when accessing the hoisting machine 1 from above the car, but the presence of multiple observation holes H makes it easier to observe the adsorbent material 6.

[0033] In this embodiment, because the fixed shaft portion 22 has an inclined surface 2220, the line of sight when checking the state of the adsorbent 6 is oblique, moving from the outer diameter to the inner diameter. Therefore, there is an advantage in that the outer diameter surface (top surface) of the adsorbent 6 can be seen more clearly than when viewing the state of the adsorbent 6 from directly to the side. Furthermore, the observation hole H is configured to ensure this line of sight.

[0034] Furthermore, the adsorbent 6 is annular in shape and is provided around the rotation center of the rotating part 3. Therefore, the annular adsorbent 6 is easy to position relative to the rotating part 3. In this embodiment, the adsorbent 6 is provided around the entire circumference of the rotation center of the rotating part 3 and is annular in shape, but it may also be provided only on a part of the circumferential direction. When the adsorbent 6 is provided on a part of the circumferential direction around the rotation center of the rotating part 3, it is preferable that it is provided on at least half of the circumference. In particular, as in this embodiment, when the adsorbent 6 is provided on the fixed part 2, the circumferential positional relationship between the oil passing through the flow paths R1 and R2 and the adsorbent 6 remains unchanged, so the adsorbent 6 can be provided only in the circumferential section that straddles the expected oil dripping position. For example, the adsorbent 6 may be provided only on the upper half of the recess 222 of the shaft extension 221 of the fixed shaft part 22.

[0035] The adsorbent material 6 can be attached and detached through the observation hole H. However, it is not limited to this, and dedicated openings for attaching and detaching the adsorbent material 6 may be provided in the fixing part 2 or the rotating part 3.

[0036] In this embodiment, the rotating part 3 is provided with an oil collection section 7 in the portion facing the adsorbent material 6 in the vertical direction (see Figure 3). Specifically, the collection section 7 is formed in the shape of a tapered edge (the cross-sectional shape is a projection that protrudes toward the adsorbent material 6), and oil is guided to the tip of this edge-shaped portion. As the rotating part 3 rotates, the tip is positioned above the adsorbent material 6, causing the oil to fall onto the adsorbent material 6. In this way, the oil collection section 7 allows the base oil leaking from the bearing 5 to be guided to the adsorbent material 6 without scattering. The collection section 7 may also be provided in the portion of the fixed part 2 that faces the adsorbent material 6 in the vertical direction.

[0037] Specifically, the aggregation portion 7 is provided on the cover member 10. This aggregation portion 7 is provided on the edge of the rotating portion 3 on the rotational axis X side of the annular portion 93 of the cover member 10. The aggregation portion 7 is a triangular projection in cross-section, composed of a flat surface 71 extending in the vertical direction and an inclined surface 72 that is inclined with respect to the vertical direction. The angle between the flat surface 71 and the inclined surface 72 is acute. In addition, a part of the aggregation portion 7 may be formed in a shape that temporarily receives oil, for example, in a recessed shape.

[0038] 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.

[0039] For example, as shown in Figures 4 to 6, the hoisting machine 1 may be equipped with an oil seal S to prevent oil (base oil separated from grease) leaking axially outward from the bearing 5 from being discharged to the outside of the hoisting machine 1. In this configuration, the aggregation section 7 is not provided.

[0040] In this configuration, the fixed-side main body portion 21, as shown in Figure 5, includes a ring-shaped first circumferential wall portion 1211 extending radially outward from the other axial end (rear end in Figure 5) of the fixed shaft portion 22, a first cylindrical portion 1212 extending from the outer peripheral edge of the first circumferential wall portion 1211 toward the other axial side (rear side in Figure 5) and formed to have a larger diameter toward the other end (rear end), a ring-shaped second circumferential wall portion 1213 extending radially outward from the other axial end (extended end) of the first cylindrical portion 1212, a cylindrical second cylindrical portion 1214 extending from the outer peripheral edge of the second circumferential wall portion 1213 toward one axial side (front side in Figure 5) to constitute the stator, and an upper side wall portion 1215 and a lower side wall portion 1216 extending vertically from the outer peripheral edge of the second cylindrical portion 1214. Furthermore, as shown in Figure 4, the fixed-side main body portion 21 includes a pair of legs 1217, 1217 formed at the lower end of the lower side wall portion 1216. A coil 1214M is wound inside the second cylindrical portion 1214 (see Figure 5).

[0041] The rotating part 3 comprises a cylindrical part 31 that fits onto the bearing 5, a disc-shaped plate part 32 extending radially outward from the other axial end of the cylindrical part 31, and a cylindrical rotor 33 extending axially from the base end of the plate part 32 to the other axial end. The rotor 33 is equipped with a permanent magnet 33A, and when current is supplied to the coil 1214M of the second cylindrical part (stator) 1214, the rotor 33 rotates and the sheave rotates. The plate part 32 is braked by being clamped by the braking part B. The rotor 33 and the stator (second cylindrical part 1214) constitute the motor. In this embodiment, an inner rotor type motor is used, but an outer rotor type motor may also be used.

[0042] In this configuration, the circular front plate portion 101 of the cover member 10 has multiple (six in Figure 4) roughly fan-shaped observation holes H formed in the circumferential direction. These observation holes H are used not only for inserting the bolts B1 and screws B3, which are other components of the hoisting machine, but also for checking the condition of the adsorbent material 6. Furthermore, the observation holes H are also used to visually inspect the oil seal S.

[0043] The oil seal S is annular in shape and is positioned axially outward from the bearing 51. Specifically, as shown in Figure 6, the oil seal S seals the space between the inner circumferential surface 102B of the cylindrical portion 102 of the cover member 10 and the outer circumferential surface 151G of the outer annular wall portion 151B of the end member 15. The outer circumferential surface 151G of this outer annular wall portion 151B is the part (sliding part) that the oil seal S rubs against due to the rotation of the rotating part 3, and lubrication of this part is necessary. This oil seal S prevents oil leaking from the first bearing 51 from being discharged to the outside of the hoisting machine. In this embodiment, the outer diameter portion of the front end of the outer annular wall portion 151B has a chamfered shape.

[0044] Furthermore, as mentioned above, the observation hole H is formed to allow at least a portion of the oil seal S to be visually inspected, and to supply lubricant in case of abnormal noise or other issues arising from the oil seal S, indicating insufficient lubrication.

[0045] When the oil seal S is visually inspected through the observation hole H, if it is determined that lubricant (e.g., oil) needs to be supplied to the oil seal S, liquid lubricant (e.g., oil) is sprayed from a spray can container through the observation hole H to supply oil to the oil seal S. The amount of lubricant supplied should be just enough to ensure that lubricant is present in the area where the oil seal S comes into contact (rubs) with the rotation of the rotating part 3.

[0046] In this embodiment, the adsorbent 6 receives oil leaking from the bearings 51 and 52 (oil passing through the flow path R3). Flow path R3 is a flow path from the front end of the first bearing 51 to the adsorbent 6 via the oil seal S and the outer annular wall portion 151B of the end member 15. The adsorbent 6 also receives oil that adheres to the cover member 10 and drips down (oil passing through the flow path R4). Flow path R4 is a flow path from the front end of the first bearing 51 to the adsorbent 6 via the oil seal S and the cylindrical portion 102 and front plate portion 101 of the cover member 10.

[0047] The adsorbent 6 is positioned at the front end of the fixed part 2, specifically the fixed shaft part 22. More specifically, the adsorbent 6 is positioned in the recess 222 of the shaft extension 221 of the fixed shaft part 22. The oil adhering to the cover member 10 and dripping (oil passing through the flow path R4) is guided along the inclined surface 2220 to the adsorbent 6.

[0048] In the above embodiment, the adsorbent 6 was placed in the fixed part 2, but it may also be placed in the rotating part 3 at a position that overlaps with the flow path from the bearings 51 and 52.

[0049] Alternatively, the adsorbent 6 may be provided so as to be movable in the circumferential direction relative to the fixed part 2. If oil is adsorbed onto a part of the adsorbent 6, instead of replacing the entire adsorbent 6, it may be shifted in the circumferential direction to allow oil to be adsorbed onto the part that has not been adsorbed at all, or only a small amount of oil has been adsorbed.

[0050] Furthermore, the adsorbent material 6 may be configured to be annular in shape and to change its radial dimension by stretching and contracting like a rubber band, so as to be elastic and able to be fitted into the recess 222 of the fixed shaft portion 22. [Explanation of Symbols]

[0051] 1...Hoisting machine, 2...Fixed part, 3...Rotating part, 5...Bearing, 6...Adsorbent material, 7...Collecting part, 10...Cover member, 13...Encoder, 15...End member, 21...Fixed side main body part, 22...Fixed shaft part, 31...Cylindrical part, 32...Plate part, 33...Rotor, 33A...Permanent magnet, 51...Bearing, 51...First bearing, 52...Second bearing, 71...Flat surface, 72...Inclined surface, 93...Annular part, 101...Front plate part, 101A...Connecting part, 102...Cylindrical part, 102B...Inner circumferential surface, 103...Annular part, 151B...Outer annular wall part, 151G...Outer circumferential surface, 211...First cylindrical part, 212...First circumferential wall part, 2 13...Second cylindrical section (stator), 213M...Coil, 214...Second peripheral wall section, 215...Third cylindrical section, 216...Leg section, 220...Shaft body, 221...Shaft extension section, 222...Recess, 1211...First peripheral wall section, 1212...First cylindrical section, 1213...Second peripheral wall section, 1214...Second cylindrical section (stator), 1214M...Coil, 1215...Upper wall section, 1216...Lower wall section, 1217...Leg section, 2220...Inclined surface, A...Projection, B...Brake section, B1...Bolt, B3...Screw, H...Observation hole, R1, R2, R3, R4...Flow path, S...Oil seal, X...Rotational axis

Claims

1. A rotating part having a sheave, A fixing part that supports the rotating part, A bearing is provided between the rotating part and the stationary part, The system comprises an adsorbent placed in the oil flow path from the bearing, The adsorbent is in the form of a sheet with its thickness direction aligned with its radial direction, and its appearance changes when it absorbs oil. An elevator hoisting machine equipped with an observation hole that allows the radially facing surface of the adsorbent material to be viewed from the outside of the hoisting machine.

2. The elevator hoisting machine according to claim 1, wherein the adsorbent is annular and is provided around the rotation center of the rotating part.

3. The elevator hoisting machine according to claim 1 or 2, wherein a collection portion for collecting oil is provided in the rotating portion or the fixed portion in a portion facing the adsorbent in the vertical direction.

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