Rotary structure and elevator

Abstract

The invention provides a rotating structure capable of preventing leakage of lubricant used in a bearing and an elevator. The rotating structure is provided with: a bearing cover that is joined to the rotating body via a liquid gasket and seals a space in which a bearing is provided; a bolt hole provided from the bearing cover to the rotating body side; and a bolt screwed into the bolt hole and used for fixing the bearing cover to the rotating body, the joint area of the bearing cover and the rotating body is provided with a non-gap forming area close to the inner peripheral part side of the bearing and a gap forming area located on the outer peripheral part side compared with the non-gap forming area. A gap between the bearing cover and the rotating body in the gap forming region is formed larger than a gap between the bearing cover and the rotating body in the non-gap forming region.

Description

Technical Field

[0001] The invention relates to a rotating structure and an elevator. Background Art

[0002] In the prior art, an elevator has a passenger car, a counterweight, a rope connecting the passenger car and the counterweight, and a traction machine around which the rope is wound. The traction machine has a main shaft, a sheave rotatably supported on the main shaft via a bearing and around which the rope is wound, and a rotating body connected to the sheave.

[0003] However, in rotating structures represented by traction machines and slings, it is necessary to seal grease as a lubricant around the bearings. In order to prevent the grease from leaking to the outside, various sealing structures such as oil seals are provided near the bearing cover covering the bearings.

[0004] Patent document 1 discloses a structure in which a bearing cover is mounted on the rotating body via a liquid seal as a seal in a traction machine having a main shaft as a rotating shaft, a first structure (rotating body) rotatably supported on the main shaft via a bearing, and a second structure (bearing cover) for sealing a space in which the bearing is provided. In addition, Patent document 1 discloses a structure in which a vent hole communicating with a bolt hole is provided to prevent damage to the liquid seal when the rotating body and the bearing cover are fixed with bolts.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2022-168422 Summary of the invention

[0008] Technical problem to be solved by the invention

[0009] However, in order to prevent the liquid gasket from being damaged, in addition to the bolt holes, a vent hole not directly used for bolt fixing needs to be provided in the rotating body, which causes concerns about ensuring a space for providing the vent hole and increasing the number of working hours.

[0010] An object of the present invention is to provide a rotating body structure and an elevator capable of preventing leakage of a lubricant used in a bearing with a simpler structure.

[0011] Means for solving problems

[0012] To solve the above-mentioned problems, the rotating structure of the present invention includes: a main shaft as a rotating axis; a rotating body rotatably supported on the main shaft via a bearing; and a bearing cover, which is connected to the rotating body via a liquid sealing gasket and is used to seal the space where the bearing is set. It also has a bolt hole set from the bearing cover to the rotating body side, and a bolt screwed into the bolt hole for fixing the bearing cover to the rotating body. The joining area where the bearing cover and the rotating body are joined has a non-gap forming area on the side close to the bearing, and a gap forming area on the side farther from the bearing than the non-gap forming area, and the gap between the bearing cover and the rotating body in the gap forming area is formed to be larger than the gap between the bearing cover and the rotating body in the non-gap forming area.

[0013] In addition, the elevator of the present invention has a traction machine capable of winding a sling. The traction machine includes: a main shaft as a rotating shaft; a rotating body rotatably supported on the main shaft via a bearing; and a bearing cover, which is engaged with the rotating body via a liquid seal and is used to seal the space where the bearing is provided. It also has a bolt hole provided from the bearing cover to the rotating body side, and a bolt screwed into the bolt hole for fixing the bearing cover to the rotating body. In a state where a liquid seal is provided between the bearing cover and the rotating body, the joining area where the bearing cover and the rotating body are joined has a non-gap forming area on the side close to the bearing, and a gap forming area on the side farther from the bearing than the non-gap forming area, and the gap between the bearing cover and the rotating body in the gap forming area is formed to be larger than the gap between the bearing cover and the rotating body in the non-gap forming area.

[0014] Effects of the Invention

[0015] According to the present invention, it is possible to prevent the oil sealed in the vicinity of the bearing from leaking to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic configuration diagram of an elevator 1 according to the first embodiment of the present invention.

[0017] Figure 2 It is a front view showing the hoisting machine 120.

[0018] Figure 3 It is a schematic cross-sectional structural diagram of the hoisting machine 120 according to the first embodiment of the present invention.

[0019] Figure 4 It is magnified Figure 3 Figure 1 shows the main parts of the diagram.

[0020] Figure 5 This is a diagram showing a state where the fixing bolts 50 are attached when the bearing cover 42 of the hoisting machine 120 is joined to the rotating body 70 .

[0021] Figure 6 It is a structural diagram of the main part of the traction machine of the comparative example.

[0022] Figure 7 It is a configuration diagram of the main part of the hoisting machine 200 according to the second embodiment of the present invention.

[0023] Figure 8 It is a configuration diagram of the main part of the hoisting machine 300 according to the third embodiment of the present invention.

[0024] Description of Reference Numerals

[0025] 1 ... elevator, 10 ... brake mechanism, 20 ... frame, 21 ... outer wall, 22 ... second connection, 23 ... stator mounting portion, 24 ... first connection, 25 ... shaft fixing portion, 26 ... space, 30 ... main shaft, 40 ... bearing, 51, 53 ... liquid seal, 42, 43 ... bearing cover, 42a, 75a ... bolt hole, 50, 52 ... bolt, 60 ... rotor, 61 ... stator, 70 ... rotating body, 71 ... third cylinder, 72 ... second connection, 73 ... second cylinder, 74 ... first connection, 75 ... first cylinder, 100 ... lifting passage, 120 ... traction machine, 122 ... sheave, 130 ... main rope, 140 ... first driven pulley, 150 ... second driven pulley, 170 ... main rope, A1 ... joint area, A2 ... gap forming area, A3 ... non-gap forming area DETAILED DESCRIPTION

[0026] Hereinafter, an example of a rotating structure and an elevator according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the present invention is not limited to the following example. In each figure described below, the same reference numerals are marked on common components. In addition, in the following description, as an example of a rotating structure, a traction machine is taken as an example to describe the details of its structure.

[0027] 1. First Implementation

[0028] First, an elevator according to Embodiment 1 of the present invention will be described with reference to the drawings. Figure 1 It is a schematic configuration diagram of an elevator 1 according to a first embodiment of the present invention (hereinafter referred to as the present embodiment).

[0029] 1-1. Elevator

[0030] The elevator 1 of this embodiment is a so-called machine room-less elevator that does not have a machine room above the elevator passage 100 formed in the building structure. In addition, in the elevator 1 of this embodiment, an example of using a machine room-less elevator is described, but it is not limited to this, and an elevator having a machine room above the elevator passage 100 may also be used.

[0031] like Figure 1 As shown, the elevator 1 includes a passenger car 110 that moves up and down in a hoistway 100 , a traction machine 120 (equivalent to a rotating structure of the present invention), a counterweight 130 , a first driven pulley 140 , a second driven pulley 150 , and a sling 170 .

[0032] A lifting pulley is provided at the lower part of the passenger car 110. The passenger car 110 is guided by a pair of car guide rails and raised and lowered in the hoistway 100. The pair of car guide rails are provided in the hoistway 100 with the passenger car 110 sandwiched therebetween, and extend in the vertical direction in the hoistway 100.

[0033] A counterweight side pulley is provided on the upper portion of the counterweight 130. The counterweight 130 is guided by a pair of counterweight guide rails (not shown) and raised and lowered in the lift passage 100. The pair of counterweight guide rails are provided in the lift passage 100 with the counterweight 130 sandwiched therebetween, and extend in the vertical direction in the lift passage 100.

[0034] The traction machine 120 is arranged at the lowest part of the elevator passage 100, and is a mechanism for lifting and lowering the passenger car 110 and the counterweight 130 by traction (lifting) via the sling 170. The first driven pulley 140 and the second driven pulley 150 are fixed to the uppermost part of the elevator passage 100. One end and the other end of the sling 170 are fixed to the uppermost part of the elevator passage 100. The sling 170 is installed from the counterweight side pulley provided on the counterweight 130 to the first driven pulley 140, and is wound around the traction machine 120, the second driven pulley 150, and the lifting pulley of the passenger car 110 in sequence.

[0035] Figure 2 1 is a front view showing the traction machine 120. Figure 2 As shown, the traction machine 120 has a frame 20, a sheave 122, a rotating body 70, two brake mechanisms 10, 10 and a motor (not shown). The frame 20 is vertically arranged in the hoistway 100 and supports the sheave 122, the rotating body 70, the two brake mechanisms 10, 10 and the motor.

[0036] The sheave 122 is formed in a substantially disk shape, and a rope 170 is wound around the outer peripheral surface. The rotating body 70 is formed in a substantially disk shape having a larger diameter than the sheave 122, and is formed integrally with the sheave 122. The sheave 122 and the rotating body 70 are rotationally driven by the motor.

[0037] When the sheave 122 is rotated by the motor, the rope 170 is driven, and the passenger car 110 and the counterweight 130 are raised and lowered in the hoistway.

[0038] The two brake mechanisms 10 , 10 are supported by the frame 20 so as to face each other in the up-down direction Z via the rotating body 70 . The two brake mechanisms 10 , 10 abut against the outer peripheral surface of the rotating body 70 to brake the rotating body 70 and the sheave 122 .

[0039] In addition, in the present embodiment, an example is described in which the two brake mechanisms 10, 10 are arranged so as to face each other in the vertical direction, but the present invention is not limited thereto. The two brake mechanisms 10, 10 may be arranged so as to face each other in a direction parallel to the horizontal direction with the rotating body 70 interposed therebetween, or may be arranged so as to be spaced apart by a predetermined angle on the upper side of the rotating body 70 in the vertical direction.

[0040] 1-2. Traction machine structure

[0041] Hereinafter, the structure of the hoisting machine 120 of this embodiment will be described. Figure 3 1 is a schematic cross-sectional view of the hoisting machine 120 according to the present embodiment. Figure 3 In the figure, the main part of the upper half from the center of the main shaft 30 which is the rotation axis is shown. Figure 3 The structure is roughly the same, so the illustration is omitted. Figure 4 It is a magnified representation Figure 3 Figure 1 shows the main parts of the diagram.

[0042] like Figure 3 As shown, the traction machine 120 includes a frame 20, a main shaft 30, a rotating body 70 rotatably supported by the main shaft 30, a sheave 122 integrally provided on the rotating body 70, and a brake mechanism 10, 10 (see Figure 2 ). In addition, the traction machine 120 has a bearing 40, oil seals 45, 46, and bearing covers 42, 43 mounted on the outer peripheral side of the main shaft 30 in order to rotatably support the rotating body 70 on the main shaft 30. Furthermore, the traction machine 120 is an outer rotor type traction machine having a stator 61 mounted on the frame 20 and a rotor 60 mounted on the rotating body 70 in a manner arranged outside the stator 61. In addition, Figure 3 In the figure, the markings of the brake mechanisms 10, 10 are omitted.

[0043] In the following description, the axial direction of the main shaft 30 is referred to as the X direction. In addition, the direction which is the vertical direction relative to the axial direction of the main shaft 30 and is the lifting direction of the car 120 is referred to as the Y direction. The direction orthogonal to the X direction and the Y direction is referred to as the Z direction. The frame 20 and the rotating body 70 are opposite to each other in the X direction. Furthermore, in the X direction, the rotating body 70 side is referred to as one side. In addition, in the X direction, the frame 20 side is referred to as the other side.

[0044] 〔frame〕

[0045] like Figure 3 As shown, the frame 20 has a shaft fixing portion 25 for fixing the main shaft 30, a stator mounting portion 23 for mounting the stator 61, and a first connecting portion 24 connecting the shaft fixing portion 25 and the stator mounting portion 23. In addition, the frame 20 has an outer wall portion 221 covering the outer periphery of the rotating body 70 and a second connecting portion 22 connecting the stator mounting portion 23 and the outer wall portion 21.

[0046] The shaft fixing portion 25 is located approximately in the center of the YZ plane of the frame 20. The shaft fixing portion 25 is formed into a cylindrical shape with the X direction as the axial direction. The stator mounting portion 23 is formed into a cylindrical shape with the X direction as the axial direction. The inner diameter of the stator mounting portion 23 is larger than the outer diameter of the shaft fixing portion 25. The stator mounting portion 23 is located radially outside the shaft fixing portion 25.

[0047] The first connection part 24 is composed of a circular plate body. The plane of the first connection part 24 is substantially orthogonal to the X direction. The inner peripheral side of the first connection part 24 is connected to the end of the shaft fixing part 25 on one side in the X direction. The outer peripheral side of the first connection part 24 is connected to the end of the stator mounting part 23 on one side in the X direction.

[0048] The outer wall portion 21 is formed into a cylindrical shape with the X direction as the axial direction. The outer wall portion 21 is located radially outside the stator mounting portion 23. The inner circumference of the outer wall portion 21 and the outer circumference of the stator mounting portion 23 are opposite to each other at a predetermined distance in the radial direction. The stator 61 and the rotor 60 are arranged in the space between the outer wall portion 21 and the stator mounting portion 23.

[0049] The second connection part 22 is composed of a circular plate body. The plane of the second connection part 22 is substantially orthogonal to the X direction. The inner side of the second connection part 22 is connected to the end of the stator mounting part 23 on the other side in the X direction. The outer side of the second connection part 22 is connected to the end of the outer wall part 21 on the other side in the X direction.

[0050] 〔Main axis〕

[0051] The spindle 30 is formed in a cylindrical shape with the X direction as the axial direction. The other side of the spindle 30 in the X direction is fitted into the inner peripheral surface side of the shaft fixing portion 25 in the frame 20. The spindle 30 is fixed to the shaft fixing portion 25. One side of the spindle 30 in the X direction protrudes from the shaft fixing portion 25. The one side of the spindle 30 in the X direction supports the rotating body 70 via the bearing 40 so as to be rotatable around the axis.

[0052] The spindle 30 is provided with an encoder chamber (not shown) inside. The encoder chamber is open at the end face on one side of the spindle 30 in the X direction. An encoder as a rotation detector is housed in the encoder chamber. The encoder has a shaft protruding toward the end face on one side in the X direction. The encoder connecting portion of the rotating body 70 described later is connected to the shaft portion of the encoder. Thus, the encoder can detect the rotation of the rotating body 70.

[0053] 〔Bearing〕

[0054] The bearing 40 is arranged in a space 26 between the inner circumference of the first cylindrical portion of the rotating body and the outer circumference near the front end of the main shaft 30. The bearing 40 is formed in an annular shape and is installed in a plurality of positions (in the X direction) on the outer circumference of the main shaft 30. Figure 3 The plurality of bearings 40 are arranged in the X direction with spacers (not shown) therebetween. The bearings 40 are composed of, for example, ball bearings, roller bearings, and the like.

[0055] The inner peripheral surface of the bearing 40 contacts the main shaft 30 at a predetermined pressure, and the outer peripheral surface thereof contacts the rotating body 70 at a predetermined pressure. Thus, the bearing 40 supports the rotating body 70 rotatably with respect to the main shaft 30.

[0056] 〔Rotating body〕

[0057] like Figure 3 As shown, the rotating body 70 is rotatably fitted in the bearings 40, 40. The rotating body 70 includes: a first cylinder 75 that clamps the bearings 40, 40 between the main shaft 30; a second cylinder 73 that mounts the sheave 122; and a first connecting portion 74 that connects the first cylinder 75 and the second cylinder 73. Furthermore, the rotating body 70 includes a third cylinder 71 that mounts the rotor 60, and a second connecting portion 72 that connects the second cylinder 73 and the third cylinder 71.

[0058] The first cylindrical portion 75 , the second cylindrical portion 73 , and the third cylindrical portion 71 are each formed in a cylindrical shape with the axial direction being the X direction. The second cylindrical portion 73 is formed in a cylindrical shape with a larger diameter than the first cylindrical portion 75 , and the third cylindrical portion 71 is formed in a cylindrical shape with a larger diameter than the second cylindrical portion 73 .

[0059] The inner circumference of the first tube 75 contacts the bearing 40 at a predetermined pressure. One end face and the other end face of the first tube 75 in the X direction serve as joint surfaces of the bearing covers 42 and 43 described later. The structure of the joint surface will be described in detail later.

[0060] The second cylinder 73 is located radially outward of the first cylinder 75. The inner periphery of the second cylinder 73 and the outer periphery of the first cylinder 75 are opposite to each other at a predetermined distance in the radial direction. In addition, the second cylinder 73 is arranged to protrude to one side in the X direction than the third cylinder 71 and the second connecting portion 72. A sheave 122 is mounted on the outer periphery of the second cylinder 73 that is arranged protrudingly.

[0061] The third cylindrical portion 71 is disposed in a space between the outer wall portion 21 of the frame 20 and the stator mounting portion 23. The rotor 60 is mounted on the inner circumference of the third cylindrical portion 71.

[0062] The first connection portion 74 is formed of an annular plate body, and has a plane that is substantially perpendicular to the X direction, and connects the middle portion of the first tube portion 75 in the X direction to the middle portion of the second tube portion 73 in the X direction.

[0063] The second connecting portion 72 is composed of a circular plate body. The plane of the second connecting portion 72 is substantially orthogonal to the X direction. The end surface of one side of the second connecting portion 72 in the X direction is connected to the end of the other side of the second cylinder 73 in the X direction. The end surface of the other side of the second connecting portion 72 in the X direction is connected to the end of one side of the third cylinder 71 in the X direction. That is, the third cylinder 71 is located at a position closer to the other side of the X-axis direction than the second cylinder 73.

[0064] 〔Rope pulley〕

[0065] The sheave 122 is formed into a cylindrical shape with the X direction as the axial direction. The sheave 122 is attached to the outer peripheral surface of the second cylinder 73 by shrink fitting or the like. A plurality of grooves 125 for winding the main rope 130 are formed on the outer peripheral portion of the sheave 122. The main rope (not shown) is wound around the plurality of grooves 125.

[0066] 〔stator〕

[0067] The stator 61 is mounted on the outer periphery of the stator mounting portion 23 of the frame 20. The stator 61 is composed of an iron core and a coil wound around the iron core.

[0068] 〔Rotor〕

[0069] The rotor 60 is mounted on the inner circumference of the third cylinder 71 of the rotating body 70. The rotor 60 is formed in a cylindrical shape with the X direction as the axial direction. The rotor 60 is a magnetic body. The rotor 60 faces the stator 61 with an air gap between the stator mounting portion 23 and the third cylinder 71.

[0070] 〔Brake mechanism〕

[0071] like Figure 2 As shown, a brake mechanism 10 is provided on the upper part of the frame 20. The brake mechanism 10 has a brake pad which is not shown. The brake pad is opposite to the outer periphery of the third cylinder portion 71 in the rotating body 70. When the brake mechanism 10, 10 brakes the brake pad to the third cylinder portion 71 side of the rotating body 70. As a result, the rotation of the rotating body 70 and the sheave 122 is braked.

[0072] 〔Bearing cover〕

[0073] The bearing covers 42 and 43 are components provided to suppress the movement of the bearing 40 in the X direction. The bearing covers 42 and 43 are formed of an annular plate component that covers the space 26 where the bearing 40 is arranged and can cover the end surface of the first cylinder 75 in the X direction. In the present embodiment, the bearing cover 42 is embedded in the outer peripheral surface of the main shaft 30 via the oil seal portion 45, and is fixed to the end of one side of the first cylinder 75 in the X direction by the bolt 50. Similarly, the bearing cover 43 is embedded in the outer peripheral surface of the main shaft 30 via the oil seal portion 46, and is fixed to the end of the other side of the first cylinder 75 in the X direction by the bolt 52.

[0074] In addition, liquid gaskets 51 and 53 are formed as static sealing materials between each of the bearing covers 42 and 43 and the end surface of the first cylinder 75 in the X direction, which is the joint surface. The liquid gaskets 51 and 53 are made of a material that solidifies from a liquid state, for example, due to drying over time, and are also called FIPG (Formed in Place Gasket). The liquid gaskets 51 and 53 are static sealing materials that do not move between the bearing cover 42 and the first cylinder 75 after being applied in a liquid state and solidified. In this embodiment, by forming the liquid gaskets 51 and 53, it is possible to prevent the lubricating oil supplied to the bearing 40 from leaking to the outside of the rotating body 70 through the space between the bearing covers 42 and 43 and the first cylinder 75, and the bearing covers 42 and 43 can be fixed to the first cylinder 75 in an oil-tight manner.

[0075] The present embodiment is characterized in that the joint regions of the liquid seals 51 and 53 are formed between the bearing covers 42 and 43 and the end surfaces in the X direction of the first tube portion 75. The structure of the joint regions of the bearing covers 42 and 43 and the first tube portion 75 will be described in detail later.

[0076] 〔Oil seal part〕

[0077] The oil seals 45 and 46 are respectively formed of annular sealing members provided on the outer peripheral surface of the main shaft 30, and are respectively provided between the bearing cover 42 and the main shaft 30, and between the bearing cover 43 and the main shaft 30. The oil seal 45 is a structure provided to prevent the lubricating oil supplied to the bearing 40 from leaking out from between the main shaft 30 and the bearing cover 42 to the outside. In addition, the oil seal 46 is a structure provided to prevent the lubricating oil supplied to the bearing 40 from leaking from between the main shaft 30 and the bearing cover 43 to the inside of the frame 20. In addition, the oil seals 45 and 46 are dynamic sealing materials that rotate relative to the main shaft 30 together with the rotating body 70.

[0078] 1-3. Structure of the joint region between the bearing cover and the first cylinder portion (rotating body)

[0079] Next, the structure of the joint area between the bearing covers 42 and 43 and the rotating body 70 provided in the hoisting machine 120 will be described. The main parts of the bearing covers 42 and 43 have the same structure, so the structure and effects of the bearing cover 42 will be described here as an example.

[0080] Figure 4 1 is an enlarged view showing a portion of the traction machine 120 where the bearing cover 42 is joined, and is a view before the bolts 50 are attached. Figure 5 This is a diagram showing a state where the bolts 50 are attached when the bearing cover 42 of the hoisting machine 120 is joined to the rotating body 70 .

[0081] like Figure 4 As shown, the bearing cover 42 is joined to the end surface of the first cylinder 75 in the X direction via the liquid seal 51. In this embodiment, the region where the bearing cover 42 and the first cylinder 75 are joined via the liquid seal 51 is defined as the joining region A1. Figure 4 As shown, the joint area A1 includes an area close to the inner peripheral side of the bearing 40 (hereinafter referred to as the non-gap forming area A3) and an area provided on the outer peripheral side of the bearing cover 42 relative to the non-gap forming area A3 (hereinafter referred to as the gap forming area A2).

[0082] like Figure 4 As shown, in the non-gap forming area A3, the surface (joining surface) of the first cylinder 75 joined to the bearing cover 42 and the surface (joining surface) of the bearing cover 42 joined to the first cylinder 75 are formed in a manner that has parallel surfaces to each other. On the other hand, in the gap forming area A2, the joining surface of the first cylinder 75 has a flat surface formed continuously from the joining surface in the non-gap forming area A3, and the joining surface of the bearing cover 42 has an inclined surface formed in a manner that the gap between the contact surface with the first cylinder 75 gradually increases from the inner peripheral side to the outer peripheral side. Therefore, when the bearing cover 42 and the first cylinder 75 are joined via the liquid seal 51, the gap δ1 (maximum value) of the joining surface in the gap forming area A2 is larger than the gap δ2 of the joining surface in the non-gap forming area A3.

[0083] In addition, in the present embodiment, a bolt hole 42a that penetrates the bearing cover 42 in the X direction is provided in the gap forming region A2 of the bearing cover 42. In addition, a bolt hole 75a that is continuous with the bolt hole 42a provided in the bearing cover 42 is also provided at the end portion in the X direction of the first cylinder portion 75. In the present embodiment, the bolt 50 is inserted from one end surface in the X direction of the bearing cover 42, penetrates the bolt hole 42a, and is screwed into the bolt hole 75a on the first cylinder portion 75 side, thereby fixing the bearing cover 42 to the end surface in the X direction of the first cylinder portion 75.

[0084] 1-4. Effect of the installation order of bearing covers and the gap forming area

[0085] The installation order of the bearing cover 42 during the assembly of the hoisting machine 120 of the present embodiment and the effect brought about by the gap forming area A2 are described. When assembling the hoisting machine 120, when installing the bearing cover 42 on the end of the first cylinder 75, first, apply the liquid seal 51 to the end surface (joint surface) of the first cylinder 75 on the side where the bearing cover 42 is installed. Then, before the liquid seal 51 solidifies, the joint surfaces of the bearing cover 42 and the first cylinder 75 are aligned and fitted, and the bolts 50 are screwed into the bolt holes 42a, 75a. In this way, the bearing cover 42 is bolted to the end of the first cylinder 75. In the present embodiment, when the bolts 50 are screwed into the bolt holes 42a, 75a, Figure 5 In the direction indicated by the arrow, the air inside the bolt holes 42a and 75a passes through the liquid gasket 51 and is pushed out toward the outer peripheral portion.

[0086] Here, Figure 6 1 is a diagram showing the structure of the main parts of the traction machine 400 of the comparative example. In the comparative example, the case where the bearing cover 442 without the inclined surface is joined to the first cylinder portion 75 is described. Figure 6 As shown in FIG. 1 , in the hoisting machine 400 of the comparative example, the joint surface of the bearing cover 442 and the joint surface of the first tube portion 75 are parallel to each other in the entire joint region. Figure 6 In, with Figure 4 The corresponding parts are marked with the same figure marks, and repeated description is omitted.

[0087] In the comparative example, the joint surface of the bearing cover 442 and the joint surface of the first tube 75 are substantially parallel throughout the entire joint region. Therefore, the gap between the bearing cover 442 and the first tube 75 after the liquid seal 51 is applied and joined is substantially uniform from the inner circumference to the outer circumference.

[0088] As shown in the comparative example, when the gap forming region is not provided, that is, the gap δ1 between the bearing cover 442 and the end of the first cylinder 75 joined via the liquid seal 51 is constant from the inner peripheral side to the outer peripheral side of the bearing cover 442. In this case, the air squeezed out from the bolt holes 42a and 75a passes through the liquid seal 51. Figure 6 As shown by the arrows, the lubricant is uniformly squeezed out on both sides of the bolt 50. As a result, a defect d is also generated in the liquid seal 51 near the bearing 40. The liquid seal 51 solidifies in the state where the defect d is formed, so it is not sealed. In this way, when the hoisting machine 400 is driven, the lubricating oil of the bearing 40 may leak out to the outside of the rotating body 70 through the defect d.

[0089] In contrast, in this embodiment, Figure 5 As shown in FIG. 1 , in the gap forming area A2, the gap between the bearing cover 42 and the first cylinder 75 is larger than the gap between the bearing cover 42 and the first cylinder 75 in the non-gap forming area A3. As a result, the pressure resistance of the liquid seal 51 applied between the bearing cover 42 and the first cylinder 75 is lower on the outer peripheral side of the bearing cover 42 than on the inner peripheral side. Therefore, when the bolt 50 is inserted before the liquid seal 51 is cured, Figure 5 As shown by the arrows in , the air squeezed out from the bolt holes 42a and 75a is actively squeezed out to the outer peripheral side having low pressure resistance, and is unlikely to flow into the inner peripheral side.

[0090] As described above, in the present embodiment, the air squeezed out from the bolt holes 42a and 75a when the bolts are tightened is squeezed out to the outer peripheral side (gap forming area A2 side). Therefore, it is possible to prevent defects from being generated in the liquid seal 51 on the inner peripheral side (oil seal oil side) of the bolts 50. As a result, in the present embodiment, when the hoisting machine 120 is driven, the lubricating oil sealed in the vicinity of the bearing 40 is oil-sealed by the liquid seal 51 formed in the non-gap forming area A3, thereby preventing leakage to the outer peripheral side of the rotating body 70.

[0091] In addition, in the present embodiment, processing to form an inclined surface may be performed on the joint surface side of the bearing cover 42. Therefore, the oil sealing performance can be improved without significantly increasing the number of working man-hours.

[0092] In the present embodiment, the example of forming the joint surface of the bearing cover 42 into a tapered (inclined) shape in the gap forming area A2 of the bearing cover 42 is taken, but the present invention is not limited thereto. Hereinafter, an example in which the structure of the joint surface in the gap forming area A2 of the bearing cover 42 is different from that of the present embodiment will be described.

[0093] 2. Second Embodiment (Example with a Step on the Joining Surface)

[0094] The structure of a hoisting machine according to a second embodiment of the present invention will be described. Figure 7 2 is a diagram showing a cross-sectional structure of a main part of a hoisting machine 200 according to a second embodiment. Figure 7 As shown, the structure of the bearing cover 242 is different from that of the first embodiment. Figure 7 In, with Figure 4 The corresponding parts are marked with the same figure symbols, and repeated description is omitted.

[0095] In a second embodiment, if Figure 7As shown, the bearing cover 242 has a step portion 242b at the boundary position of the non-gap forming area A3 and the gap forming area A2 in the joint surface. The bearing cover 242 is configured so that the joint surface in the gap forming area A2 is located on the side of the joint surface of the non-gap forming area A3 in the X direction. In addition, in the second embodiment, the joint surface of the bearing cover 242 is arranged in parallel with the joint surface of the first cylinder 75 in the non-gap forming area A3 and the gap forming area A2.

[0096] Furthermore, the bolt holes 242 a and 75 a provided in the bearing cover 242 and the first cylindrical portion 75 are provided on the outer peripheral portion side of the bearing cover 242 , that is, on the gap forming region A2 side, rather than the step portion 242 b .

[0097] By adopting such a structure, when the bearing cover 242 is joined with the first cylinder portion 75, the distance from the joining surface of the first cylinder portion 75 to the joining surface of the bearing cover 242 in the gap forming area A2 is greater than the distance from the joining surface of the first cylinder portion 75 to the joining surface of the bearing cover 242 in the non-gap forming area A3.

[0098] In the second embodiment, after the liquid seal 51 is applied to the joint surface of the first cylinder 75, the bearing cover 242 is attached, and the bearing cover 242 and the first cylinder 75 are fastened by the bolt 50. In the second embodiment, as in the first embodiment, the pressure resistance of the liquid seal 51 on the gap forming area A2 side is lower than the pressure resistance of the liquid seal 51 on the non-gap forming area A3 side. Therefore, the air inside the bolt holes 242a and 75a that is squeezed out when the bolt 50 is inserted is discharged to the outer peripheral side of the bearing cover 242 as shown by the arrow. Therefore, the defect d in the liquid seal 51 caused by the squeezed air is formed only on the gap forming area A2 side, and the defect can be prevented from being formed on the non-gap forming area A3 side (the inner peripheral side of the bearing cover 242). Therefore, in the second embodiment, when the traction machine 200 is driven, the lubricating oil sealed near the bearing 40 can also be prevented from leaking.

[0099] 3. Third Embodiment (Example in which the Step Portion is Formed by an Inclined Surface)

[0100] Next, a hoisting machine according to a third embodiment of the present invention will be described. Figure 8 1 is a diagram showing a cross-sectional structure of a main part of a hoisting machine 300 according to a third embodiment. Figure 8 As shown, the structure of the step portion 342b in the bearing cover 342 is different from that in the second embodiment. Figure 8 In, with Figure 4 and Figure 7 The corresponding parts are marked with the same figure symbols and repeated description is omitted.

[0101] In the third embodiment, the step portion 342b provided at the boundary between the non-gap forming area A3 and the gap forming area A2 in the joint surface of the bearing cover 342 has an inclined surface formed to be inclined with respect to the X direction. The other structures are the same as those of the second embodiment.

[0102] In the third embodiment, after the liquid seal 51 is applied to the joint surface of the first cylinder 75, the bearing cover 342 is attached, and the bearing cover 342 and the first cylinder 75 are fastened by the bolt 50. In the third embodiment, as in the first and second embodiments, the pressure resistance of the liquid seal 51 on the gap forming area A2 side is lower than the pressure resistance of the liquid seal 51 on the non-gap forming area A3 side. Therefore, the air inside the bolt holes 342a and 75a that is squeezed out when the bolt 50 is inserted is discharged to the outer peripheral side of the bearing cover 342 as shown by the arrow. Therefore, the defect d in the liquid seal 51 caused by the squeezed air is formed only on the gap forming area A2 side, and the defect can be prevented from being formed on the non-gap forming area A3 side (the inner peripheral side of the bearing cover 342). As a result, in the third embodiment, when the traction machine 300 is driven, it is also possible to prevent the lubricating oil sealed near the bearing 40 from leaking out.

[0103] In the above, in the first to third embodiments, in order to make the gap between the joint surface of the bearing cover and the first barrel in the gap forming area A2 larger than the gap between the joint surface of the bearing cover and the first barrel in the non-gap forming area A3, an example of forming an inclined surface or providing a step portion on the joint surface of the bearing cover side is given. However, the present invention is not limited to this. For example, in the joint surface of the first barrel, by forming an inclined surface and a step portion (step surface) in the gap forming area, the distance (gap) between the joint surface of the bearing cover and the first barrel in the gap forming area can be made larger than the distance (gap) between the joint surface of the bearing cover and the first barrel in the non-gap forming area. In addition, by processing both surfaces of the joint surface of the bearing cover and the first barrel, the distance (gap) between the joint surface of the bearing cover and the first barrel in the gap forming area can also be made larger than the distance (gap) between the joint surface of the bearing cover and the first barrel in the non-gap forming area.

[0104] In addition, in the present embodiment, a traction machine is described as an example of a rotating structure, but the structure of the rotating structure of the present invention can also be applied to Figure 1 The structure of each pulley shown in the figure can be applied to various rotating structures.

[0105] The above-mentioned embodiments are described in detail for the purpose of easily understanding the present invention, and are not limited to having all the structures described. For example, a part of the structure of the embodiment can be replaced with other structures, and other structures can be added to the structure of the embodiment. In addition, other structures can be added, deleted, or replaced for a part of the structure of the embodiment.

Claims

1. A rotating structure, characterized in that: include: The spindle as the axis of rotation; a rotating body rotatably supported on the main shaft via a bearing; a bearing cover member engaged with the rotating body via a liquid seal and used for sealing a space in which the bearing is disposed; A bolt hole provided from the bearing cover to the rotating body side; and a bolt screwed into the bolt hole for fixing the bearing cover to the rotating body, In a state where the liquid seal is provided between the bearing cover and the rotating body, a joint region where the bearing cover and the rotating body are joined has a non-gap forming region on a side close to the bearing and a gap forming region on a side farther from the bearing than the non-gap forming region. The gap between the bearing cover and the rotating body in the gap forming region is formed to be larger than the gap between the bearing cover and the rotating body in the non-gap forming region.

2. The rotating structure according to claim 1, characterized in that: The bolt hole is provided in the gap forming area.

3. The rotating structure according to claim 2, characterized in that: In the non-gap forming region, a surface of the bearing cover that is engaged with the rotating body and a surface of the rolling body that is engaged with the bearing cover are formed parallel to each other. In the gap forming region, a surface of the bearing cover on the side joined to the rotating body has an inclined surface formed so that the gap between the bearing cover and the rotating body continuously increases toward the outer peripheral portion of the bearing cover.

4. The rotating structure according to claim 2, characterized in that: In the non-gap forming region, a surface of the bearing cover that is engaged with the rotating body and a surface of the rotating body that is engaged with the bearing cover are formed parallel to each other. In the gap forming region, a surface of the rotating body on the side joined to the bearing cover has an inclined surface formed so that a gap between the rotating body and the bearing cover continuously increases toward an outer peripheral portion of the bearing cover.

5. The rotating structure according to claim 4, characterized in that: The surface of the rotating body on the side joined to the bearing cover or / and the surface of the bearing cover on the side joined to the rotating body have a step portion at a boundary between the gap forming region and the non-gap forming region.

6. The rotating structure according to claim 5, characterized in that: The step portion has an inclined surface.

7. An elevator, characterized in that: A traction machine capable of winding up a sling, The traction machine comprises: The spindle as the axis of rotation; a rotating body rotatably supported on the main shaft via a bearing; a bearing cover member engaged with the rotating body via a liquid seal and used for sealing a space in which the bearing is disposed; Bolt holes provided from the bearing cover to the rotating body side; and a bolt screwed into the bolt hole for fixing the bearing cover to the rotating body, In a state where the liquid seal is provided between the bearing cover and the rotating body, a joint region where the bearing cover and the rotating body are joined has a non-gap forming region on a side close to the bearing and a gap forming region on a side farther from the bearing than the non-gap forming region. The gap between the bearing cover and the rotating body in the gap forming region is formed to be larger than the gap between the bearing cover and the rotating body in the non-gap forming region.

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