Oil seal device and elevator hoist

Abstract

To obtain an oil seal device capable of maintaining a seal function over a long period of time with a simple configuration.SOLUTION: An oil seal body 24 is sandwiched between a first elastic body 25 and a second elastic body 27. The first elastic body 25 is made of a material, such as rubber, that undergoes permanent deformation over time when the oil seal body 24 is pressed by the second elastic body 27. As the first elastic body 25 permanently deforms, the oil seal body 24 is pushed by the second elastic body 27, and then can slide relative to a housing 21 and a main shaft 22.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an oil seal device and an elevator hoisting machine. [Background technology]

[0002] In a conventional shaft sealing device for an elevator hoisting machine, an oil seal is provided between a housing of a reducer and an input shaft. The input shaft is rotatably held in the housing via a bearing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-338088 Summary of the Invention [Problem to be solved by the invention]

[0004] In the shaft seal device of the conventional elevator traction machine described above, the lip of the oil seal wears the input shaft with continued use, causing the sealing function to deteriorate. For this reason, it was necessary to replace the existing oil seal with a new oil seal and shift the contact position of the oil seal with the input shaft. Furthermore, if it was difficult to replace the oil seal, it was necessary to use an input shaft made from a high-hardness material.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an oil seal device that can maintain sealing function over a long period of time with a simple configuration, and an elevator hoisting machine using the same. [Means for solving the problem]

[0006] The oil seal device of the present disclosure comprises an oil seal main body provided between a first member and a second member, a first elastic body provided between the first member and the second member and against which the oil seal main body is abutted, and a second elastic body provided between the first member and the second member and pressing the oil seal main body against the first elastic body, the first elastic body being made of a material that generates permanent strain over time when the oil seal main body is pressed by the second elastic body, and the oil seal main body is pressed by the second elastic body in accordance with the permanent strain of the first elastic body, and is therefore slidable relative to the first member and the second member. [Effects of the Invention]

[0007] According to the present disclosure, a sealing function can be maintained for a long period of time with a simple configuration. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing an elevator apparatus according to a first embodiment. [Figure 2] FIG. 2 is an enlarged half cross-sectional view showing a main part of the hoisting machine body of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 Fig. 1 is a schematic configuration diagram showing an elevator apparatus according to embodiment 1. In Fig. 1, a machine room 2 is provided above a hoistway 1. An elevator hoisting machine 3 and a deflector sheave 6 are installed in the machine room 2.

[0010] The elevator hoist 3 has a hoist main body 4 and a drive sheave 5. The hoist main body 4 has a hoist motor (not shown) and a hoist brake (not shown). The hoist motor rotates the drive sheave 5. The hoist brake keeps the drive sheave 5 stationary. The hoist brake also brakes the rotation of the drive sheave 5.

[0011] A suspension body 7 is wound around the drive sheave 5 and the deflector sheave 6. A plurality of ropes or belts is used as the suspension body 7. A car 8 is connected to a first end of the suspension body 7. A counterweight 9 is connected to a second end of the suspension body 7.

[0012] The car 8 and the counterweight 9 are suspended in the hoistway 1 by a suspension body 7. The car 8 and the counterweight 9 move up and down in the hoistway 1 by rotating the drive sheave 5.

[0013] A pair of car guide rails 10 and a pair of counterweight guide rails 11 are installed in the hoistway 1. In Fig. 1, only one car guide rail 10 and one counterweight guide rail 11 are shown.

[0014] A pair of car guide rails 10 guide the car 8 as it moves up and down. A pair of counterweight guide rails 11 guide the counterweight 9 as it moves up and down.

[0015] The car 8 has a car frame 12 and a cab 13. The suspension body 7 is connected to the car frame 12. The cab 13 is supported by the car frame 12.

[0016] Fig. 2 is an enlarged half-sectional view showing a main part of the hoist body 4 of Fig. 1. In addition to the hoist motor and the hoist brake, the hoist body 4 further has a housing 21 as a first member, a main shaft 22 as a second member, an oil seal device 23, and a pair of bearings (not shown).

[0017] A shaft holding hole 21a is formed in the housing 21. The main shaft 22 passes through the shaft holding hole 21a. The main shaft 22 is held in the housing 21 via a pair of bearings. This allows the main shaft 22 to rotate around an axis C of the main shaft 22 relative to the housing 21.

[0018] A drive sheave 5 is fixed to the main shaft 22. The hoist motor rotates the drive sheave 5 via the main shaft 22. That is, the drive sheave 5 rotates due to the rotation of the main shaft 22 relative to the housing 21.

[0019] A cylindrical gap 21b is formed between the inner peripheral surface of the shaft holding hole 21a and the outer peripheral surface of the main shaft 22. The oil seal device 23 is fitted into the gap 21b.

[0020] The oil seal device 23 also has an oil seal main body 24, a ring-shaped first elastic body 25, a ring-shaped pressing member 26, and a second elastic body 27.

[0021] The oil seal body 24 is provided between the housing 21 and the main shaft 22. That is, the oil seal body 24 is interposed between the housing 21 and the main shaft 22. The oil seal body 24 also prevents oil from moving beyond the oil seal body 24.

[0022] The first elastic body 25 is provided between the housing 21 and the main shaft 22. The first elastic body 25 is fitted into the shaft holding hole 21a and fixed to the inner circumferential surface of the shaft holding hole 21a. For example, the first elastic body 25 is press-fitted into the shaft holding hole 21a.

[0023] An oil seal body 24 is in contact with an end face of the first elastic body 25 in the axial direction of the main shaft 22. The axial direction of the main shaft 22 is the direction along the axis C, which is the left-right direction in FIG.

[0024] The pressing member 26 is provided between the housing 21 and the main shaft 22. The pressing member 26 is fitted into the shaft holding hole 21a and fixed to the inner circumferential surface of the shaft holding hole 21a. For example, the pressing member 26 is press-fitted into the shaft holding hole 21a. The pressing member 26 is disposed on the opposite side of the oil seal body 24 from the first elastic body 25.

[0025] The second elastic body 27 is provided between the housing 21 and the main shaft 22. The second elastic body 27 is also interposed between the pressing member 26 and the oil seal main body 24. The second elastic body 27 presses the oil seal main body 24 against the first elastic body 25. The oil seal main body 24 is sandwiched between the first elastic body 25 and the second elastic body 27.

[0026] For example, one or more compression springs are used as the second elastic body 27. Each compression spring is interposed in a compressed state between the pressing member 26 and the oil seal main body 24. As a result, the oil seal main body 24 is constantly pressed against the first elastic body 25 by the second elastic body 27.

[0027] The first elastic body 25 is made of a material, such as rubber, that will undergo permanent deformation over time when the oil seal body 24 is pressed by the second elastic body 27.

[0028] The oil seal body 24 is pushed by the second elastic body 27 as the first elastic body 25 permanently deforms, and is thereby slidable relative to the housing 21 and the main shaft 22 .

[0029] In this oil seal device 23, due to the specifications over time, permanent deformation, or so-called settling, gradually occurs in the first elastic body 25. As a result, the oil seal body 24 gradually moves to the right in Figure 2, i.e., in the direction away from the pressing member 26, and the force acting on the oil seal body 24 from the second elastic body 27 also gradually changes.

[0030] As a result, the position where the lip of the oil seal body 24 contacts the main shaft 22 also gradually changes over time. This prevents the same location on the main shaft 22 from wearing out, even if the main shaft 22 is not made of a high-hardness material. Therefore, with a simple configuration, the sealing function can be maintained over a long period of time.

[0031] Furthermore, by making the first elastic body 25 from rubber and the second elastic body 27 from a compression spring, the structure can be further simplified.

[0032] Furthermore, in the elevator hoisting machine 3 equipped with the oil seal device 23 of the first embodiment, the frequency of replacing the oil seal body 24 can be sufficiently reduced, thereby reducing the burden of maintenance work. In addition, the sealing function can be maintained for a long period of time, thereby improving the quality of the elevator hoisting machine 3.

[0033] In the first embodiment, the main shaft 22 is a rotating shaft that rotates together with the drive sheave 5, but the main shaft 22 may be a fixed shaft. In this case, the drive sheave 5 rotates relative to the main shaft 22 around the axis C. The first member is the drive sheave 5 or a member that rotates together with the drive sheave 5.

[0034] In this way, the main shaft 22 as the second member is a member that can rotate relatively to the first member, and the drive sheave 5 rotates due to the rotation of the main shaft 22 relative to the first member.

[0035] Furthermore, when the elevator hoisting machine includes a speed reduction mechanism, the first member may be a rotation shaft of the speed reduction mechanism.

[0036] Furthermore, the type of elevator is not limited to the type shown in FIG. 1, and may be, for example, a 2:1 roping type.

[0037] The elevator may also be a machine room-less elevator, a double-deck elevator, a one-shaft multi-car elevator, etc. In a one-shaft multi-car elevator, an upper car and a lower car located directly below the upper car each independently ascend and descend in a common elevator shaft.

[0038] Furthermore, the oil seal device of the present disclosure can be applied to devices other than the elevator hoisting machine 3. [Explanation of symbols]

[0039] 3 elevator hoisting machine, 5 drive sheave, 21 housing (first member), 22 main shaft (second member), 23 oil seal device, 24 oil seal main body, 25 first elastomer, 27 second elastomer.

Claims

1. an oil seal body provided between the first member and the second member; a first elastic body provided between the first member and the second member and against which the oil seal body is abutted; and a second elastic body provided between the first member and the second member and pressing the oil seal body against the first elastic body; Equipped with the first elastic body is made of a material that generates permanent deformation over time when the oil seal body is pressed by the second elastic body, The oil seal device is configured such that the oil seal body is pushed by the second elastic body in accordance with permanent deformation of the first elastic body, and is slidable relative to the first member and the second member.

2. the first elastic body is made of rubber, 2. The oil seal device according to claim 1, wherein the second elastic body is a compression spring.

3. a main shaft as the second member that is rotatable relative to the first member; a drive sheave that rotates due to relative rotation of the main shaft with respect to the first member; and The oil seal device according to claim 1 or 2. An elevator hoisting machine comprising:

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