Rotating body and elevator

Abstract

The present invention provides a rotating body and an elevator to which the rotating body is applied, capable of preventing leakage of lubricant used for a bearing. The rotating body includes: a main shaft serving as a rotation shaft; a first structure rotatably supported by the main shaft via a bearing; and a second structure mounted on the first structure via a liquid gasket to seal a space where the bearing is provided. Further, the rotating body includes: a bolt hole provided from the second structure to the first structure side; a fixing bolt threadedly engaged with the bolt hole to fix the second structure to the first structure; and a vent hole provided in the first structure, communicating with the bolt hole and also communicating with a space different from the space where the bearing is provided.

Description

Technical Field

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

[0002] Conventionally, in order to seal oil such as a lubricant between two mutually combined components, a sealing structure using a liquid gasket has been proposed for application to the mating surfaces of the two components. A liquid gasket is a material commonly used for sealing gases and liquids, and is a material that cures as it dries over time from a liquid state. Patent Document 1 discloses the following: A liquid gasket before curing is applied to one of the two components, and the other component is attached to the one component via the liquid gasket. Then, by curing the liquid gasket, the two components are fixed in an oil-tight manner.

[0003] Prior Art Documents

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-144884

[0005] However, in a rotating body such as a hoist for an elevator or a pulley, a structure is required to use a lubricant (grease) around the bearing portion and prevent the leakage of the lubricant. However, when sealing the lubricant, there is a possibility that the liquid gasket may be damaged. Summary of the Invention

[0006] Therefore, an object of the present invention is to provide a rotating body that can prevent the leakage of a lubricant used for a bearing and an elevator using the rotating body.

[0007] To solve the above problems and achieve the object of the present invention, the rotating body of the present invention includes: a main shaft serving as a rotating shaft; a first structure that is rotatably supported by the main shaft via a bearing; and a second structure that is attached to the first structure via a liquid gasket and seals the space where the bearing is provided. Further, it includes: a bolt hole that is provided from the second structure to the first structure side; a fixing bolt that is threadedly engaged with the bolt hole and is used to fix the second structure to the first structure; and a vent hole that is provided in the first structure, communicates with the bolt hole, and communicates with a space different from the space where the bearing is provided.

[0008] The elevator of the present invention includes the above rotating body.

[0009] The effects of the present invention are as follows.

[0010] According to the present invention, in the rotating body, breakage of the liquid gasket during assembly can be prevented, and thus leakage of the lubricant from the broken portion of the liquid gasket can be prevented. Brief Description of the Drawings

[0011] Figure 1It is a schematic structural diagram showing a structural example of an elevator according to the first embodiment of the present invention.

[0012] Figure 2 It is a cross-sectional structural diagram of a counterweight side pulley according to the first embodiment of the present invention.

[0013] Figure 3 It is a cross-sectional structural diagram of a counterweight side pulley according to the second embodiment of the present invention.

[0014] Figure 4 It is a cross-sectional structural diagram of a counterweight side pulley according to the third embodiment of the present invention.

[0015] Figure 5 A is a structural diagram when observing the counterweight side pulley according to the fourth embodiment of the present invention from the first fixed member side, Figure 5 B is a structural diagram when observing the counterweight side pulley according to the fourth embodiment of the present invention from the second fixed member side.

[0016] Figure 6 It is a cross-sectional structural diagram of a counterweight side pulley according to the fourth embodiment of the present invention.

[0017] Figure 7 It is a cross-sectional structural diagram of a counterweight side pulley according to the fifth embodiment of the present invention.

[0018] Figure 8 It is a cross-sectional structural diagram of a counterweight side pulley according to the sixth embodiment of the present invention.

[0019] Figure 9 It is a cross-sectional structural diagram of a counterweight side pulley according to the seventh embodiment of the present invention.

[0020] Figure 10 It is a cross-sectional structural diagram of a counterweight side pulley according to the eighth embodiment of the present invention.

[0021] Figure 11 It is a cross-sectional structural diagram of a counterweight side pulley 300 according to the comparative example.

[0022] Figure 12 A and Figure 12 B are diagrams showing the situation during the assembly of the counterweight side pulley 300 according to the comparative example.

[0023] In the figure: 1 - elevator, 3 - main rope, 4 - hoist, 4a - rope pulley, 10 - counterweight side pulley, 11 - pulley body, 12 - boss portion, 12a - cylindrical hole, 13 - main shaft, 14 - lubricant, 15 - bearing, 17 - first fixing member, 18 - second fixing member, 19 - rib, 20 - first fixing member side bolt hole, 21 - first boss portion side bolt hole, 22 - first bolt hole, 23 - second fixing member side vent hole, 24 - boss portion side vent hole, 25 - vent hole, 26 - vent hole, 27 - first fixing bolt, 28 - second fixing bolt, 29 - second fixing member side bolt hole, 30 - second boss portion side bolt hole, 31 - second bolt hole, 32 - liquid gasket, 33 - liquid gasket, 70 - rotating body, 71 - sealing member, 201 - second structure body, 202 - first structure body, 203, 204 - bolt holes, 205 - liquid gasket, 206 - vent hole, 207 - bolt, 30 - counterweight side pulley. Detailed implementation mode

[0024] Hereinafter, an example of an elevator and a rotating body according to an embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to the following examples. In the following figures, the same reference numerals are assigned to common components.

[0025] 1. First embodiment

[0026] 1-1. Structure of elevator

[0027] First, with reference to Figure 1 an elevator according to a first embodiment (hereinafter referred to as "the present embodiment") of the present invention will be described. Figure 1 is a schematic structural diagram showing a structural example of the elevator 1 of the present embodiment.

[0028] As Figure 1 shown, it is a so-called machine room elevator having a machine room above the hoistway formed in a building structure. In addition, Figure 1 the elevator 1 shown is a so-called 2:1 rope winding type elevator.

[0029] The elevator 1 has an elevator car 2 that moves up and down in the hoistway 100, a main rope 3, a hoist 4, and a counterweight 5 suspended on the elevator car 2 via the main rope 3. Hereinafter, the direction in which the elevator car 2 and the counterweight 5 move up and down will be referred to as the vertical direction.

[0030] A person or goods are placed in the elevator car 2. A car-side pulley 2a is provided at the upper part of the elevator car 2 in the vertical direction. A main rope 3 is wound around the car-side pulley 2a. A counterweight-side pulley 10 is provided on the counterweight 5. The main rope 3 is wound around the counterweight-side pulley 10. It should be noted that the detailed structure of the counterweight-side pulley 10 will be described later.

[0031] The hoist 4 is provided on the machine beam 110 of the machine room provided in the hoistway 100. In addition, the hoist 4 has a rope pulley 4a around which the main rope 3 is wound. Then, the hoist 4 raises and lowers the elevator car 2 and the counterweight 5 via the main rope 3.

[0032] One end 3a of the main rope 3 is installed on the machine beam 110 via a rope head rod. The main rope 3 extends from the machine beam 110 toward the car-side pulley 2a. Moreover, the main rope 3 is wound in the order of the car-side pulley 2a, the rope pulley 4a, and the counterweight-side pulley 10 starting from one end 3a.

[0033] In addition, the other end 3b of the main rope 3 extending from the counterweight-side pulley 10 toward the upper part of the hoistway 100 is installed on the machine beam 110 via a rope head rod in the same manner as one end 3a. By driving the hoist 4, the elevator car 2 and the counterweight 5 move up and down in the hoistway 100. In addition, the counterweight 5 moves up and down along the wall surface 101 of the hoistway 100.

[0034] The hoist 4, the car-side pulley 2a, and the counterweight-side pulley 10 can each be configured as a rotating body of the present invention. Hereinafter, as an example of the rotating body of the present invention, taking the counterweight-side pulley as an example, the structure of the rotating body of the present invention will be described.

[0035] 1-2. Structural example of the counterweight-side pulley (rotating body)

[0036] Next, with reference to Figure 2 the structure of the counterweight-side pulley 10 will be described. Figure 2 is a sectional structure diagram of the counterweight-side pulley 10.

[0037] As Figure 2 shown, the counterweight-side pulley 10 has a main shaft 13, a pulley body 11, and a bearing 15. The main shaft 13 is formed in a cylindrical shape. Support brackets (not shown) are installed at both axial ends of the main shaft 13. And the main shaft 13 is installed on the counterweight 5 via the support brackets.

[0038] In addition, one axial end of the main shaft 13 faces the wall surface 101 of the hoistway 100. The other axial end of the main shaft 13 faces the side opposite to the wall surface 101 of the hoistway 100, that is, the elevator car 2 side.

[0039] The pulley body 11 is rotatably supported on the outer peripheral surface 13a of the main shaft 13 via a bearing 15. The pulley body 11 has a winding portion 16 and a boss portion 12. The boss portion 12 is disposed at the central portion in the radial direction of the pulley body 11, and the winding portion 16 is disposed on the outer side in the radial direction of the pulley body 11. The boss portion 12 and the winding portion 16 are connected via a rib 19.

[0040] The boss portion 12 is formed in a cylindrical shape. A bearing 15 is disposed in the cylindrical hole 12a of the boss portion 12. In addition, a disk-shaped first fixing member 17 is disposed at one axial end portion of the boss portion 12 and the bearing 15, and a disk-shaped second fixing member 18 is disposed at the other axial end portion of the boss portion 12 and the bearing 15. Thus, the cylindrical hole 12a of the boss portion 12 is surrounded by the first fixing member 17 and the second fixing member 18. And a lubricant 14 is injected into the space surrounded by the cylindrical hole 12a of the boss portion 12, the first fixing member 17 and the second fixing member 18.

[0041] In the present embodiment, the first fixing member 17 is adhered to one end portion of the boss portion 12 via a liquid gasket 32 and fixed by a first fixing bolt 27. The liquid gasket 32 is made of a material that cures from a liquid state, for example, by drying over time, and is also called FIPG (Formed in Place Gasket). The liquid gasket 32 has a sealing effect and is used to fix the first fixing member 17 to one end portion of the bearing 15 in an oil-tight manner.

[0042] The first fixing bolt 27 is fixed to a first bolt hole 22 provided in the first fixing member 17 and the boss portion 12. The first bolt hole 22 is composed of a first fixing member side bolt hole 20 and a first boss portion side bolt hole 21 communicating with the first fixing member side bolt hole 20.

[0043] The first fixing member side bolt hole 20 is provided so as to penetrate the first fixing member 17 in the axial direction of the main shaft 13. The first boss portion side bolt hole 21 is formed along the axial direction of the main shaft 13 from the surface of the boss portion 12 on the first fixing member 17 side (one side). Moreover, the first boss portion side bolt hole 21 is set to a depth at which the first fixing bolt 27 can be tightened. In addition, the first fixing member side bolt hole 20 is composed of a drilled hole having a diameter through which the first fixing bolt 27 can be inserted. On the other hand, an internal thread that is threadedly engaged with the first fixing bolt 27 is provided in the first boss portion side bolt hole 21. By threadedly engaging the first fixing bolt 27 with the first bolt hole 22 configured as described above, the first fixing member 17 can be fixed to one end portion of the boss portion 12.

[0044] In addition, vent holes 25 communicating with the first bolt holes 22 are provided in the boss portion 12 and the second fixing member 18. The vent holes 25 are composed of boss portion side vent holes 24 and second fixing member side vent holes 23 communicating with the boss portion side vent holes 24. The boss portion side vent holes 24 extend in the axial direction of the main shaft 13 in the boss portion 12 and are continuously provided from the first boss portion side bolt hole 21 toward the other end side of the boss portion 12. The second fixing member side vent holes 23 are provided so as to penetrate the second fixing member 18 in the axial direction of the main shaft 13. In addition, the boss portion side vent holes 24 and the second fixing member side vent holes 23 are formed by drill holes having a diameter substantially the same as the diameter of the first bolt holes 22. That is, internal threads are not provided on the inner peripheral surface of the vent holes 25.

[0045] The first fixing member side bolt holes 20, the first boss portion side bolt holes 21, the boss portion side vent holes 24, and the second fixing member side vent holes 23 are provided such that the centers of their respective holes are located on the same axis. In the present embodiment, a plurality of the first bolt holes 22 and the vent holes 25 are provided at equal intervals in a concentric circle shape centered on the center of the main shaft 13, and the first fixing member 17 is fixed by a plurality of first fixing bolts 27. And, in the present embodiment, the first bolt holes 22 communicate with a space different from the space where the bearing 15 is provided through the vent holes 25. Therefore, a structure is formed in which the air in the first bolt holes 22 is opened to the outside through the vent holes 25.

[0046] On the other hand, the second fixing member 18 is fixed to the other end portion of the boss portion 12 by a second fixing bolt 28. The second fixing bolt 28 is fixed to second bolt holes 31 provided in the second fixing member 18 and the boss portion 12. The second bolt holes 31 are composed of second fixing member side bolt holes 29 and second boss portion side bolt holes 30.

[0047] The second fixing member side bolt holes 29 are provided so as to penetrate the second fixing member 18 in the axial direction of the main shaft 13. The second boss portion side bolt holes 30 are formed along the axial direction of the main shaft 13 from the surface of the boss portion 12 on the second fixing member 18 side (the other side). And, the second boss portion side bolt holes 30 are provided to a depth at which the second fixing bolt 28 can be tightened. In addition, the second fixing member side bolt holes 29 are formed by drill holes having a diameter through which the second fixing bolt 28 can be inserted. On the other hand, internal threads for screwing together with the second fixing bolt 28 are provided in the second boss portion side bolt holes 30.

[0048] A plurality of the second bolt holes 31 are provided at equal intervals in a concentric circle shape centered on the center axis of the main shaft 13, and are provided at positions that do not overlap with the vent holes 25 between two adjacent vent holes 25. Thus, the formation positions of the second bolt holes 31 do not interfere with the vent holes 25. By threadedly engaging the second fixing bolt 28 with the second bolt holes 31 configured as above, the second fixing member 18 can be fixed to one end portion of the boss portion 12.

[0049] A rib 19 is formed on the outer peripheral surface of the boss portion 12. The rib 19 is formed at an intermediate portion in the axial direction on the outer peripheral surface of the boss portion 12. The rib 19 extends radially outward from the outer peripheral surface of the boss portion 12. Moreover, the rib 19 connects the boss portion 12 and the hooking portion 16.

[0050] The hooking portion 16 is formed in a cylindrical shape. A groove portion 16a for hooking the main rope 3 is formed on the outer peripheral surface of the hooking portion 16. In addition, a rib 19 is connected to the inner wall surface 16b of the hooking portion 16. The rib 19 is located at an intermediate portion in the axial direction of the inner wall surface 16b.

[0051] The pulley main body 11 is formed by casting. Therefore, the hooking portion 16 and the boss portion 12 are formed integrally.

[0052] 1-3. Assembly method of the counterweight side pulley

[0053] In the present embodiment, when installed at one end portion of the boss portion 12, first, a liquid gasket 32 in a liquid state is applied to a portion for fixing the first fixing member 17 at one end portion of the boss portion 12. After that, before the liquid gasket 32 cures, the first fixing member 17 is brought into contact with one end portion of the boss portion 12. At this time, alignment is performed such that the first fixing member side bolt hole 20 overlaps with the first boss portion side bolt hole 21.

[0054] After that, the first fixing bolt 27 is inserted through the first fixing member side bolt hole 20, and the first fixing bolt 27 is threadedly engaged with the first boss portion side bolt hole 21. Thus, the first fixing member 17 can be fixed to one end portion of the boss portion 12. And as time passes, the liquid gasket dries, and thus the first fixing member 17 is fixed to one end portion of the boss portion 12 in a state where better oil tightness is maintained.

[0055] In the present embodiment, the first bolt hole 22 threadedly engaged with the first fixing bolt 27 communicates with a space different from the space where the bearing 15 is provided through the vent hole 25, that is, the space outside the pulley main body 11 having an air flow. Thus, when the first fixing bolt 27 is screwed into the first bolt hole 22 to fix the first fixing member 17, damage to the sealing performance of the liquid gasket 32 can be prevented. The reason for this is described below with reference to a comparative example.

[0056] 1-4. Structure of the counterweight side pulley involved in the comparative example

[0057] Figure 11 is a cross-sectional structure diagram of the counterweight side pulley 300 involved in the comparative example. In Figure 11 , the parts corresponding to Figure 2 are marked with the same reference numerals, and repeated descriptions are omitted. In the counterweight side pulley 300 of the comparative example, the first bolt hole 22 is not communicated with the ventilation hole. That is, in the counterweight side pulley 300 involved in the comparative example, the first bolt hole 22 for fixing the first fixing member 17 on the side where the liquid gasket 32 is provided is different from the first bolt hole 22 of the first embodiment in that it is not communicated with a space different from the space where the bearing 15 is provided.

[0058] Figure 12 A and Figure 12 B are diagrams showing the situation during the assembly of the counterweight side pulley 300 of the comparative example. First, as shown in Figure 12 A, a liquid gasket 32 is applied to one end of the boss portion 12. Then, as shown in Figure 12 B, before the liquid gasket 32 is cured, the first fixing member 17 is aligned with one end of the boss portion 12 and fixed with the first fixing bolt 27. At this time, the air inside the first bolt hole 22 ( Figure 12 the portion surrounded by the single-dot chain line C in B) leaks from the fastening surfaces (here, between the liquid gasket 32 and one end of the boss portion 12 a, and between the liquid gasket 32 and the first fixing member 17 b). In this way, defects are generated in the liquid gasket 32, and there is a problem that the oil sealing performance is reduced due to the defective portion. When the oil sealing performance of the liquid gasket 32 is reduced, due to the centrifugal force when the counterweight side pulley 300 rotates, it is possible to leak the lubricant 14 for the bearing 15 from between the liquid gasket 32 and the boss portion 12 a, or between the liquid gasket 32 and the first fixing member 17 b, causing malfunctions.

[0059] In contrast, in the counterweight side pulley 10 of the present embodiment shown in Figure 2 , the first fixing member 17 fixed on the side where the liquid gasket 32 is provided is fixed with the first fixing bolt 27 using the first bolt hole 22 communicated with the ventilation hole 25. Since the ventilation hole 25 is communicated with the space having an air flow, when the first fixing bolt 27 is inserted into the first bolt hole 22, the air inside the first bolt hole 22 is discharged to the outside of the second fixing member 18 through the ventilation hole 25. Therefore, it is possible to prevent air from leaking between the liquid gasket 32 and the boss portion 12, or between the liquid gasket 32 and the first fixing member 17. As a result, it is possible to prevent defects from occurring in the liquid gasket 32 and ensure the oil sealing performance.

[0060] 2. Second Embodiment

[0061] Next, the counterweight side pulley according to the second embodiment of the present invention will be described. Figure 3 It is a cross-sectional structure diagram of the counterweight side pulley 40 according to the second embodiment of the present invention. In Figure 3 , the parts corresponding to Figure 2 are labeled with the same reference numerals, and repeated descriptions are omitted.

[0062] In the counterweight side pulley 40 according to the second embodiment, an internal thread for threadedly engaging the first fixing bolt 27 is provided on the inner peripheral surface of the first fixing member side bolt hole 41 that constitutes the first bolt hole 42. As Figure 3 shown, by providing an internal thread in the first fixing member side bolt hole 41, the first fixing bolt 27 is also threadedly engaged with the first fixing member 17 and fixed. Therefore, compared with the counterweight side pulley 10 according to the first embodiment, the fixing strength of the first fixing member 17 can be improved.

[0063] On the other hand, in the second fixing member side bolt hole 43 that constitutes the second bolt hole 47, an internal thread for threadedly engaging the second fixing bolt 28 is also provided on the inner peripheral surface. Since the second bolt hole 47 is fixed by being threadedly engaged with the second fixing member side bolt hole 43 provided with an internal thread and the second boss portion side bolt hole 30, compared with the counterweight side pulley 10 according to the first embodiment, the fixing strength of the second fixing member 18 can be improved.

[0064] Moreover, in the counterweight side pulley 40 according to the second embodiment, the first bolt hole 42 is also communicated with the ventilation hole 25 that opens to the space having an air flow. Therefore, when the first fixing bolt 27 is fixed, breakage of the liquid gasket 32 can be prevented. Thus, when the counterweight side pulley 40 rotates, leakage of the lubricant 14 can be prevented.

[0065] 3. Third Embodiment

[0066] Next, the counterweight side pulley according to the third embodiment of the present invention will be described. Figure 4 It is a cross-sectional structure diagram of the counterweight side pulley 50 according to the third embodiment of the present invention. In Figure 4 , the parts corresponding to Figure 2 are labeled with the same reference numerals, and repeated descriptions are omitted.

[0067] In the counterweight-side pulley 50 according to the third embodiment, the boss-side vent hole 49 that forms the vent hole 48 communicating with the first bolt hole 22 is formed with the same diameter as the first boss-side bolt hole 21, and an internal thread is provided on the inner peripheral surface in the same manner as the first boss-side bolt hole 21. In the present embodiment, the boss-side vent hole 49 also extends along the axial direction of the main shaft 13 in the boss 12 and is continuously provided from the first boss-side bolt hole 21 to the other end side of the boss 12.

[0068] In the present embodiment, since the boss-side vent hole 49 is formed by the same threaded hole as the first boss-side bolt hole 21, the first boss-side bolt hole 21 and the boss-side vent hole 49 can be machined in the same process. Thus, compared with the first embodiment, the number of processes in machining the first boss-side bolt hole 21 and the boss-side vent hole 49 can be reduced.

[0069] In addition, it has the same effect as the first embodiment.

[0070] 4. Fourth Embodiment

[0071] Next, the counterweight-side pulley according to the fourth embodiment of the present invention will be described. Figure 5 A is a structural diagram when observing the counterweight-side pulley 60 according to the fourth embodiment of the present invention from the side of the first fixing member 17, Figure 5 B is a structural diagram when observing the counterweight-side pulley 60 according to the fourth embodiment of the present invention from the side of the second fixing member 18. Additionally, Figure 6 is a cross-sectional structural diagram along the Figure 5 A and Figure 5 B of the A - B line. In Figure 5 A, Figure 5 B, and Figure 6 , the parts corresponding to Figure 2 are marked with the same reference numerals, and repeated descriptions are omitted.

[0072] The counterweight-side pulley 60 according to the fourth embodiment is the same as the first fixing member 17, and the second fixing member 18 is also fixed to the other end of the boss 12 via the liquid gasket 33 by the second fixing bolt 28. Additionally, in the fourth embodiment, vent holes 63 are provided on the boss 12 and the first fixing member 17 in a manner communicating with the second bolt hole 31. The vent hole 63 is composed of a boss-side vent hole 61 and a first-fixing-member-side vent hole 62 communicating with the boss-side vent hole 61.

[0073] The vent hole 61 on the boss part side extends axially along the main shaft 13 in the boss part 12 and is continuously provided from the second boss part side bolt hole 30 toward one end side of the boss part 12. The first fixed part side vent hole 62 is provided so as to penetrate the first fixed part 17 in the axial direction of the main shaft 13. The boss part side vent hole 61 and the first fixed part side vent hole 62 are formed by drill holes having a diameter substantially the same as the diameter of the first bolt hole 22. That is, no internal thread is provided on the inner peripheral surface of the vent hole 63.

[0074] As Figure 5 A and Figure 5 As shown in B, the first bolt hole 22, the vent hole 25 communicating with the first bolt hole 22, the second bolt hole 31, and the vent hole 63 communicating with the second bolt hole 31 are alternately arranged at equal intervals on concentric circles with respect to the center O of the main shaft 13. Thus, the first bolt hole 22, the vent hole 25 communicating with the first bolt hole 22, the second bolt hole 31, and the vent hole 63 communicating with the second bolt hole 31 are arranged at positions where they do not interfere with each other.

[0075] Furthermore, in the fourth embodiment, the first fixed part side bolt hole 20 provided in the first fixed part 17 and the first fixed part side vent hole may also be formed by drill holes having the same diameter. Also, the second fixed part side bolt hole 29 provided in the second fixed part 18 and the second fixed part side vent hole 23 may also be formed by drill holes having the same diameter. Thus, in the first fixed part 17 and the second fixed part 18, it is not necessary to separately fabricate the first fixed part side bolt hole 20 and the first fixed part side vent hole 62 and the second fixed part side bolt hole 29 and the second fixed part side vent hole 23, and the number of processes during machining can be suppressed.

[0076] In the fourth embodiment, at both ends of one end and the other end of the boss part 12, the first fixed part 17 and the second fixed part 18 are fixed via the liquid gasket 33. And, the first fixing bolt 27 for fixing the first fixed part 17 is fixed to the first bolt hole 22 communicating with the vent hole 25, and the second fixing bolt 28 for fixing the second fixed part 18 is fixed to the second bolt hole 31 communicating with the vent hole 63. Therefore, at the other end of the boss part 12, when the second fixing bolt 28 is fixed, the air inside the second bolt hole 31 is also discharged to the outside of the pulley main body 11 through the vent hole 63. Thus, even at the other end of the boss part 12, it is possible to prevent the liquid gasket 33 from being damaged due to the air pressure during bolt fixing.

[0077] In addition to this, the same effects as those of the first embodiment can be obtained.

[0078] In the first to fourth embodiments described above, as an example of the rotating body of the present invention, the counterweight side pulley of the elevator 1 was taken as an example for explanation. However, the structure of the present invention can be applied to all rotating bodies having bearings. Hereinafter, for example, taking the rotating body used inside the hoist 4 of the elevator 1 as an example, the structure of the present invention will be described.

[0079] 5. Fifth Embodiment

[0080] Next, the rotating body according to the fifth embodiment of the present invention will be described. Figure 7 It is a cross-sectional structure diagram of the rotating body 70 according to the fifth embodiment of the present invention. In Figure 7 , the same reference numerals are assigned to the parts corresponding to Figure 2 and repeated descriptions are omitted. The difference between the rotating body 70 according to the fifth embodiment and the first embodiment is that the second fixing member 18 in the first embodiment is not provided.

[0081] In the fifth embodiment, a first fixing member 17 is provided at one end of the boss portion 12. On the other hand, a sealing member 71 such as an oil seal that seals the cylinder hole 12a in an oil-tight manner is provided on the inner peripheral surface of the cylinder hole 12a on the end side of the boss portion 12.

[0082] In the rotating body 70 according to the fifth embodiment, the first bolt hole 22 also communicates with the vent hole 72 provided in the boss portion 12. The vent hole 72 is continuously provided from the first boss portion side bolt hole 21 to one end side of the boss portion 12 and is provided so as to penetrate the boss portion 12. The vent hole 72 is formed by drilling having the same diameter as the first boss portion side bolt hole 21. In the fifth embodiment, through the vent hole 72, the first bolt hole 22 opens to a space different from the space where the bearing 15 is provided on the other end side of the boss portion 12.

[0083] In the fifth embodiment, since the second fixing member 18 (refer to Figure 2 ) is not provided, the thinning of the rotating body 70 can be achieved, and it is an effective structure particularly in the case where there is a requirement to prevent oil from leaking to one end side of the boss portion 12.

[0084] Moreover, the same effects as those of the first embodiment can also be obtained in the fifth embodiment.

[0085] 6. Sixth Embodiment

[0086] Next, the rotating body 80 according to the sixth embodiment of the present invention will be described. Figure 8 It is a cross-sectional structure diagram of the rotating body 80 according to the sixth embodiment of the present invention. In Figure 8 , the same reference numerals are assigned to the parts corresponding to Figure 2 andFigure 7 Corresponding parts are marked with the same reference numerals, and repeated descriptions are omitted. The rotating body 80 according to the sixth embodiment is an example in which the structure of the vent hole 81 is different from that of the fifth embodiment.

[0087] In the rotating body 80 according to the sixth embodiment, the first bolt hole 22 also communicates with the vent hole 81 provided in the boss portion 12. The vent hole 81 is continuously provided from the first boss portion side bolt hole 21 to the other end portion side of the boss portion 12 and is provided so as to penetrate the boss portion 12. Further, the vent hole 81 is formed by a drilled hole having a diameter φd smaller than the diameter φD of the first boss portion side bolt hole 21. In the sixth embodiment, through the vent hole 81, the first bolt hole 22 opens to a space different from the space where the bearing 15 is provided on the other end portion side of the boss portion 12.

[0088] In the rotating body according to the sixth embodiment, the diameter φd of the vent hole 81 is configured to be smaller than the diameter φD of the first boss portion side bolt hole 21. Therefore, compared with the rotating body 70 according to the fifth embodiment, the rigidity of the boss portion 12 can be maintained, and the vent hole 81 can be formed while maintaining the strength of the boss portion 12. In addition, the same effects as those of the fifth embodiment can be obtained.

[0089] 7. Seventh Embodiment

[0090] Next, the rotating body 90 according to the seventh embodiment of the present invention will be described. Figure 9 is a cross-sectional structure diagram of the rotating body 90 according to the seventh embodiment of the present invention. In Figure 9 , corresponding parts to Figure 1 and Figure 5 are marked with the same reference numerals, and repeated descriptions are omitted. The rotating body 90 according to the seventh embodiment is an example in which the structure of the vent hole 91 is different from that of the sixth embodiment.

[0091] In the rotating body 90 according to the seventh embodiment, the first bolt hole 22 also communicates with the vent hole 91 provided in the boss portion 12. The vent hole 91 is formed by a drilled hole extending radially outward of the boss portion 12 in a manner of penetrating the outer peripheral surface of the boss portion 12 from the bottom side of the first boss portion side bolt hole 21. The vent hole 91 is provided at a position where it does not overlap with the end portion of the first fixing bolt 27 when the first fixing bolt 27 is screwed into the first bolt hole 22. In the seventh embodiment, the first bolt hole 22 also opens to the space on the outer peripheral surface side of the boss portion 12 through the vent hole 91.

[0092] In the rotating body 90 according to the seventh embodiment, the vent hole 91 is formed by a drill hole extending in the radial direction of the boss portion 12. Thus, in the boss portion 12, compared with the vent hole provided so as to extend in the axial direction of the main shaft 13, the length of the vent hole 91 can be shortened, and thus the machining becomes easy. In addition, since the vent hole 91 does not penetrate the other end portion side of the boss portion 12, even when other components are provided on the other end portion side of the boss portion 12, the formation position of the vent hole 91 does not restrict the component positions of the other components.

[0093] In addition, for example, when the second fixing member 18 is provided as in the weight side pulley 10 in the first embodiment, the structure of the vent hole 91 according to the seventh embodiment can also be combined. In this case, it is not necessary to provide the second fixing member side vent hole 23 in the second fixing member 18, and thus alignment between holes and the like are not necessary. As a result, the degree of freedom in design becomes higher. In addition to this, the same effects as those of the first embodiment and the fifth embodiment can be obtained.

[0094] As described above, in the first to fourth embodiments, the case where the first fixing member 17, the boss portion 12, and the second fixing member 18 are fixed to each other has been described, and in the fifth to seventh embodiments, the case where the first fixing member 17 and the boss portion 12 are fixed has been described. Hereinafter, a more generalized embodiment related to the rotating body of the present invention will be described.

[0095] 8. Eighth Embodiment

[0096] Figure 10 FIG. is a schematic structural diagram of a main part of a rotating body 200 according to an eighth embodiment of the present invention. The rotating body 200 according to the eighth embodiment is a rotating body having a bearing (not shown). The rotating body includes: a first structure body 202 having a bolt hole 203; and a second structure body 201 that is fixed by a bolt 207 via a liquid gasket 205 on one end side. A vent hole 206 communicating with the bolt hole 203 is formed in the first structure body 202. An opening on the side opposite to the opening communicating with the bolt hole 203 in the vent hole 206 opens to a space different from the space where the bearing is provided in the first structure body 202. A bolt hole 204 through which the bolt 207 is inserted is provided in the second structure body 201. And, the bolt hole 204 communicates with the bolt hole 203. The second structure body 201 is provided so as to seal the space where the bearing is provided.

[0097] In the eighth embodiment, the bolt holes 204 and 203 also communicate with the vent hole 206 that opens to a space different from the space where the bearing is provided. In the eighth embodiment, the bolt 207 is also screwed into the bolt holes 204 and 203. At this time, as Figure 10As shown, in the case of applying the liquid gasket 205 in a manner that plugs the bolt holes 203, the liquid gasket 205 is punctured and the bolt is screwed in. Also, in the present embodiment, when the bolts 207 are screwed into the bolt holes 203 and 204, the air inside is discharged to the outside (a space different from the space where the bearing is provided) through the vent holes 206. Therefore, it is possible to prevent the liquid gasket 205 from being damaged due to the air pressure generated when the bolts 207 are screwed in.

[0098] Thus, in the rotating body 200 having the lubricant supplied to the bearing and the periphery of the bearing, by providing the vent holes 206 for opening the air inside the bolt holes 204 and 203 to a space different from the space where the bearing is provided, the effects of the present invention can be obtained.

[0099] The described embodiment is an embodiment described in detail for easy understanding of the present invention and is 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 also other structures can be added to the structure of the embodiment. In addition, for a part of the structure of the embodiment, other structures can be added, deleted, or replaced.

Claims

1. A rotating body, characterized in that: It includes: A main shaft that serves as a rotation axis; A first structure that is rotatably supported on the main shaft via a bearing; A second structure that is installed on the first structure via a liquid gasket to seal the space where the bearing is provided; A bolt hole that is provided from the second structure to the first structure side; A fixing bolt that is threadedly engaged with the bolt hole to fix the second structure to the first structure; and A vent hole that is provided in the first structure, communicates with the bolt hole, and communicates with a space different from the space where the bearing is provided.

2. The rotating body according to claim 1, characterized in that: The vent hole has a diameter smaller than the diameter of the bolt hole.

3. The rotating body according to claim 1, characterized in that: The vent hole is provided to extend in a direction different from the extending direction of the bolt hole.

4. The rotating body according to claim 1, characterized in that: The vent hole is provided to extend in the same direction as the extending direction of the bolt hole.

5. The rotating body according to claim 1, characterized in that: The vent hole is provided with the same internal thread as the bolt hole.

6. The rotating body according to claim 1, characterized in that: It further includes: A third structure that is installed on a part of the first structure different from the part where the second structure is installed via a liquid gasket to seal the space where the bearing is provided; Other bolt holes that are provided from the third structure to the first structure side; Other fixing bolts that are threadedly engaged with the other bolt holes to fix the third structure to the first structure; And Other vent holes that are provided in the first structure, communicate with the other bolt holes, and communicate with a space different from the space where the bearing is provided and having an air flow.

7. An elevator, characterized in that: It includes a rotating body around which a rope is wound, The rotating body includes: A main shaft that serves as a rotation axis; A first structure that is rotatably supported on the main shaft via a bearing; A second structure that is installed on the first structure via a liquid gasket to seal the space where the bearing is provided; A bolt hole that is provided from the second structure to the first structure side; A fixing bolt that is threadedly engaged with the bolt hole to fix the second structure to the first structure; and A vent hole that is provided in the first structure, communicates with the bolt hole, and communicates with a space different from the space where the bearing is provided.

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