Elevator hoisting machine

Abstract

To provide an elevator hoisting machine that can properly lubricate oil seals. [Solution] An elevator hoisting machine comprising a stationary part 2 having a stator 214, a rotatable rotating part 3 having a rotor 33 positioned opposite the stator 214, a sheave that rotates with the rotation of the rotating part 3, a bearing 5 that rotatably supports the rotating part 3 with respect to the stationary part 2, and an oil seal 6 for preventing oil leaking axially outward from the bearing 5 from being discharged to the outside, wherein at least a part of the oil seal 6 is visible from outside the hoisting machine and openings 91K, 211K are provided that allow oil to be supplied to the oil seal 6 from outside the hoisting machine.

Description

Technical Field

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

Background Art

[0002] In the hoisting machine of the elevator, a sheave for suspending a car and a counterweight via a rope is provided. 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. Over time, 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 get into the brake part of the hoisting machine and interfere with braking.

[0004] As a countermeasure against this, it is conceivable to provide an oil seal in the path through which the base oil travels. In this case, the oil seal is provided so as to rotate together with, for example, a rotating part provided in the hoisting machine and slide on a fixed part around the rotating part (for example, Patent Document 1).

[0005] However, while the leakage of the base oil from the bearing is small when the hoisting machine is initially installed, or when a bearing with a built-in seal structure (sealed bearing) is used and the leakage of the base oil is small, the lubrication of the oil seal itself may be insufficient. In this case, the oil seal may be damaged due to friction with the rotating part, or noise may be generated from the sliding part as it rotates.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

[0007] Therefore, the object of the present invention is to provide an elevator hoisting machine that can properly lubricate an oil seal. [Means for solving the problem]

[0008] 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 seal for preventing oil leaking axially outward from the bearing from being discharged to the outside, wherein at least a portion of the oil seal is visible from outside the hoisting machine and an opening is provided that allows lubricant to be supplied to the oil seal from outside the hoisting machine.

[0009] According to the present invention, by visualizing at least a portion of the oil seal from outside the hoisting machine through the opening, it is possible to determine whether lubricant needs to be supplied. If necessary, lubricant can be supplied to the oil seal through the opening. This allows the oil seal to be properly lubricated.

[0010] Furthermore, in the elevator hoisting machine of the present invention, the opening may extend parallel to the rotational axis of the rotating part.

[0011] As described above, the opening extends straight and parallel to the rotational axis of the rotating part, making the oil seal easily visible and allowing for easy inspection of its condition.

[0012] Furthermore, the elevator hoisting machine of the present invention may be provided with a plug that allows the opening to be opened and closed to the outside.

[0013] As described above, unless the state of the oil seal is checked, if the opening is closed with a plug portion, it is possible to prevent the intrusion of dust or the like into the opening.

[0014] Further, in the hoisting machine of the elevator of the present invention, the opening may also serve as an opening for passing other components constituting the hoisting machine.

[0015] As described above, by using the opening for passing other components constituting the hoisting machine as the opening, the complication of the configuration can be suppressed.

Effect of the Invention

[0016] The present invention can visually recognize the oil seal through the opening and supply the lubricant to the oil seal as necessary, so that it is possible to provide a hoisting machine for an elevator that can appropriately lubricate the oil seal.

Brief Description of the Drawings

[0017] [Figure 1] It is a front view of the hoisting machine of the elevator of the present invention. [Figure 2] It is a rear view of the hoisting machine. [Figure 3] It is a longitudinal side view of the hoisting machine. [Figure 4] It is an enlarged view of the main part of FIG. 3. [Figure 5] It is a front view of the state where the dust cover of the hoisting machine in FIG. 1 is removed. [Figure 6] It is an enlarged view of the mounting portion of the first oil seal in FIG. 4. [Figure 7] It is an enlarged view of the mounting portion of the second oil seal in FIG. 4. [Figure 8] It is an enlarged view of the mounting portion of the third oil seal in FIG. 4.

Embodiment for Carrying Out the Invention

[0018] Hereinafter, an embodiment of a hoist of an elevator according to the present invention will be described with reference to the drawings. The hoist 1 shown in FIG. 3 includes a rotating part 3 described later to which a sheave (not shown) around which a rope (not shown) for suspending a car for carrying people or goods and a counterweight (both not shown) is wound is rotatably attached. The hoist 1 is disposed above or below the hoistway in which the car moves up and down, or inside the hoistway. In FIG. 3, the left-right direction of the drawing sheet is taken as the front-back direction, the up-down direction of the drawing sheet is taken as the up-down direction, and the direction passing through the drawing sheet is taken as the left-right direction, and the following description will be given.

[0019] As shown in FIG. 3, the hoist 1 includes, for example, a fixing part 2 fixed to a floor surface or the like, a rotating part 3 rotatable with respect to the fixing part 2, a sheave rotated by the rotation of the rotating part 3, a bearing 5 that rotatably supports the rotating part 3 with respect to the fixing part 2, an oil seal 6 for preventing oil (base oil separated from grease) leaking out axially outward from the bearing 5 from being discharged to the outside of the hoist 1, and a braking part 7 (see FIG. 1) for braking the sheave. The braking part 7 includes a brake disk 72 described later shown in FIGS. 1 and 3, and three clamps 71 (see FIG. 1) disposed on both sides of the brake disk 72.

[0020] The fixing part 2 includes, for example, a fixing-side main body part 21 fixed to the floor surface, and a hollow fixing shaft part 22 extending from a substantially central part in the up-down direction of the fixing-side main body part 21 to one side in the axial direction (front side in FIG. 3).

[0021] The fixed-side main body portion 21 is made of a metal material and, as shown in Figure 3, has a ring-shaped first circumferential wall portion 211 extending radially outward from the other axial end (rear end in Figure 3) of the fixed shaft portion 22, a first cylindrical portion 212 extending axially outward from the outer peripheral edge of the first circumferential wall portion 211 (rear side in Figure 3) and having a larger diameter towards the other end (rear end), and a portion extending radially outward from the other axial end (extended end) of the first cylindrical portion 212. The device comprises a ring-shaped second circumferential wall portion 213 extending in a horizontal direction, a cylindrical second cylindrical portion 214 extending from the outer peripheral edge of the second circumferential wall portion 213 toward one axial direction (the front side in Figure 3) and constituting a stator, an upper side wall portion 215 and a lower side wall portion 216 (see Figure 2) extending vertically from the outer peripheral edge of the second cylindrical portion 214, and a pair of leg portions 217, 217 (see Figure 1) formed at the lower end of the lower side wall portion 216. A coil 214M is wound inside the second cylindrical portion 214.

[0022] The rotating part 3 is made of a metal material and comprises a cylindrical part 31 that fits onto the bearing 5, a disc-shaped brake disc 72 extending radially outward from the other axial end (rear end) of the cylindrical part 31, and a cylindrical rotor 33 extending from the base end of the brake disc 72 to the other axial end (rear end). The rotor 33 is equipped with a permanent magnet 33A, and when current is supplied to the coil 214M of the second cylindrical part (stator) 214, the rotor 33 rotates and the sheave rotates. The brake disc 72 is braked by being clamped by the clamper 71. The rotor 33 and the stator (second cylindrical part 214) constitute the motor. In this embodiment, an inner rotor type motor is used, but an outer rotor type motor may also be used.

[0023] As shown in Figures 3 and 4, the bearings 5 ​​are arranged in multiple units (two in this embodiment) in the axial direction and positioned between the outer circumferential surface of the fixed shaft portion 22 and the inner circumferential 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 made up of at least one of the following: a self-aligning roller bearing, a ball bearing, or a tapered bearing, and the number of bearings 5 ​​and their specific configuration are not limited.

[0024] A cover member 9 is provided at one axial end (front end) of the cylindrical portion 31 of the rotating portion 3. An end member 8 is fixed to one axial end (front end) of the fixed shaft portion 22 by multiple bolts B1. Furthermore, the rotating shaft of an encoder (not shown) for measuring the rotational speed of the sheave is connected to the inner center of the cover member 9. The main body of the encoder is fixed to the fixed shaft portion 22 by multiple encoder mounting bolts (not shown).

[0025] Furthermore, the cover member 9 has multiple (six in Figure 5) substantially fan-shaped first openings 91K formed in the circumferential direction. These first openings 91K are used not only for inserting the bolt B1 and the encoder mounting bolt, which are other components of the hoisting machine, but also to allow visibility of at least a portion of the first oil seal 61 (described later) and to supply oil to the first oil seal 61.

[0026] The oil seal 6 is annular in shape and is positioned axially outward from the two bearings 51 and 52. Specifically, as shown in Figure 4, the first oil seal 61, located at one axial end (front side), is provided to seal the space between the inner circumferential surface 92B of the cover member 9 and the outer circumferential surface 81G of the end member 8. This inner circumferential surface 92B is the part (sliding part) that the first oil seal 61 rubs against due to the rotation of the rotating part 3, and this part is lubricated. The first oil seal 61 prevents oil leaking from the first bearing 51 from being discharged to the outside of the hoisting machine 1.

[0027] Furthermore, the second oil seal 62, located on the other axial end (rear end), is positioned to seal the space between the outer circumferential surface 22A of the other axial end (rear end) of the fixed shaft portion 22 and the inner circumferential surface 311A ​​of the projection 311 that protrudes radially inward from the other axial end of the cylindrical portion 31 of the rotating portion 3. The inner circumferential surface 311A ​​of the projection 311 is the part (sliding part) that the second oil seal 62 rubs against due to the rotation of the rotating portion 3, and this part is lubricated. This second oil seal 62 prevents oil leaking from the second bearing 52 from being discharged to the outside of the hoisting machine 1.

[0028] 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.

[0029] The liquid base oil separated by this phenomenon may leak out from 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 brake section of the hoisting machine 1 and interfere with braking.

[0030] As a countermeasure, oil seals 61 and 62 are provided in the path through which the base oil flows, as described above.

[0031] However, when the hoisting machine 1 is first installed, and there is little leakage of base oil from the bearings 51 and 52, or when bearings with a built-in sealing structure (shielded bearings) are used and there is little leakage of base oil, the oil seals 61 and 62 themselves may not be sufficiently lubricated. In this case, the oil seals 61 and 62 may be damaged by friction with the rotating part 3, or noise may be generated from the sliding parts as they rotate. Therefore, in this invention, the oil seals 61 and 62 (especially the parts 61S and 62S that come into contact (rub) with the rotating part 3 due to its rotation (see Figures 6 and 7)) are visually inspected to ensure proper lubrication.

[0032] Specifically, as described above, the first opening 91K is formed to allow at least a portion of the first oil seal 61 to be visible and to supply oil to the first oil seal 61. The hoisting machine 1 also has a second opening 211K that allows the second oil seal 62 to be visible from outside the hoisting machine 1 and to supply oil to the second oil seal 62 from outside the hoisting machine 1. The second opening 211K is made up of a through hole formed in the first peripheral wall portion 211 of the fixed portion 2. The second opening 211K is formed at approximately the same distance as the distance from the rotational axis X of the rotating portion 3 to the second oil seal 62 and is a through hole that extends parallel to the rotational axis X of the rotating portion 3.

[0033] When the first oil seal 61 or the second oil seal 62 is visually inspected through the first opening 91K or the second opening 211K, if it is determined that lubricant (e.g., oil) needs to be supplied to the first oil seal 61 or the second oil seal 62, liquid lubricant (e.g., oil) is sprayed from a spray can container through the first opening 91K or the second opening 211K to supply oil to the first oil seal 61 or the second oil seal 62. The amount of lubricant supplied should be sufficient to ensure that lubricant is present in the parts 61S and 62S where the first oil seal 61 and the second oil seal 62 come into contact (rub against each other) due to the rotation of the rotating part 3.

[0034] After applying lubricant to the second oil seal 62 through the second opening 211K, a third oil seal 63 is provided to prevent excess lubricant from flowing downward through the gap S between the fixed part 2 and the rotating part 3 (see Figure 3).

[0035] As shown in Figure 4, the protrusion 311 comprises a first protrusion 3111 that protrudes radially inward, and a second protrusion 3112 that extends from the radially inward end of the first protrusion 3111 toward the other axial end (rear side). The third oil seal 63 is installed in the substantially L-shaped space formed by these first and second protrusions 3111 and 3112, sealing the space between the rear surface 31B of the cylindrical portion 31 of the rotating portion 3 and the front surface 211A of the first circumferential wall portion 211 of the fixed portion 2. This prevents the excess oil from flowing downward through the gap S between the fixed portion 2 and the rotating portion 3. The portion of the front surface 211A of the first circumferential wall portion 211 of the fixed portion 2 that the third oil seal 63 contacts is radially outward from the second opening 211K (see Figure 4). The hoisting machine is equipped with a third opening 211H that allows the third oil seal 63 to be seen from outside the hoisting machine and allows oil to be supplied to the third oil seal 63 from outside the hoisting machine. The third opening 211H is formed from a through hole formed in the first peripheral wall portion 211 of the fixed portion 2. The third opening 211H is formed radially opposite to the second opening 211K, with the rotational center axis X in between.

[0036] The present invention will be further explained with reference to Figures 6 to 8. In Figure 6, two oil adsorption parts 14 and 15 are attached near the axial outer (front) side of the first oil seal 61 to adsorb base oil leaking out from the first oil seal 61, but these are not required. One oil adsorption part 14 is provided on a part (or the entire circumference) of the inner circumferential surface 92B of the cover member 9, and the other oil adsorption part 15 is provided over the entire circumference (or a part) of the inclined surface 81b of the annular wall portion 81B on the outside of the end member 8.

[0037] In Figure 7, the oil adsorption part 16 is attached to the rear end surface 22C of the fixed shaft portion 22 at a position below the second opening 211K, but it is not required. The oil adsorption part 16 adsorbs any excess oil that is supplied to the oil seal 62 through the second opening 211K and remains in the second opening 211K, which is then discharged to the outside from the rear end of the second opening 211K.

[0038] In Figure 8, the oil adsorption part 17 is attached to the rear end surface 211B of the first peripheral wall portion 211, below the position of the third opening 211H. The oil adsorption part 17 adsorbs the excess oil that is supplied to the third oil seal 63 through the third opening 211H and remains in the third opening 211H, which is then discharged to the outside from the rear end of the third opening 211H. Note that the oil adsorption parts 14 to 17 may be made of felt fabric, or any other material that can adsorb oil.

[0039] Furthermore, as shown in the enlarged view of Figure 7, when not supplying oil to the second oil seal 62, the second opening 211K may be closed with an openable / closable plug 19 made of rubber, resin, or the like to prevent dust from entering the second opening 211K and to prevent the lubricant from drying out. The closing member may be a thin seal attached to the wall surface, or a bolt screwed into the second opening 211K. The third opening 211H may also be closed with a closing member in the same manner.

[0040] 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.

[0041] In the above embodiment, the openings 91K, 211K, and 211H were formed to extend parallel to the rotational axis X of the rotating part 3. However, if the oil seal 6 is visible and oil can be supplied, the openings 91K, 211K, and 211H may be formed to extend in a direction intersecting the rotational axis X of the rotating part 3.

[0042] Furthermore, although the above embodiment shows a case where the first opening 91K also serves as an opening formed in the cover member 9 for passing other components of the hoisting machine, it may also be implemented with a dedicated opening for supplying lubricant. [Explanation of Symbols]

[0043] 1... Hoisting machine, 2... Fixed part, 3... Rotating part, 5... Bearing, 6... Oil seal, 7... Braking part, 8... End member, 9... Cover member, 14~17... Oil adsorption part, 19... Plug part (closing member), 21... Fixed side main body part, 22... Fixed shaft part, 22A... Outer circumference surface, 22C... Rear end surface, 31... Cylindrical part, 31B... Rear side surface, 33... Rotor, 33A... Permanent magnet, 51... First bearing, 52... Second bearing, 61, 62... First and second oil seals, 61S, 62S... Contact parts, 63... Third oil seal, 71... Brake, 7 2...Brake disc, 81B...Annular wall section, 81G...Outer surface, 81b...Inclined surface, 91K...First opening, 211K...Second opening, 211H...Third opening, 92B...Inner surface, 211A...Front side, 211B...Rear end surface, 212...First cylindrical section, 214...Stator (Second cylindrical section), 214M...Coil, 215...Upper wall section, 216...Lower wall section, 217...Leg section, 311...Protrusion, 311A...Inner surface, 3111...First protrusion, 3112...Second protrusion, B1...Bolt, S...Gap, X...Rotational axis

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 seal for preventing oil leaking axially outward from the bearing from being discharged to the outside, An elevator hoisting machine having an opening that allows at least a portion of the oil seal to be visible from outside the hoisting machine, and that allows lubricant to be supplied to the oil seal from outside the hoisting machine.

2. The elevator hoisting machine according to claim 1, wherein the opening extends parallel to the rotational axis of the rotating part.

3. The elevator hoisting machine according to claim 1 or 2, further comprising a plug portion that allows the aforementioned opening to be opened and closed to the outside.

4. The elevator hoisting machine according to claim 1, wherein the opening also serves as an opening for passing other components constituting the hoisting machine through.

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