Oil seal device and elevator traction machine

Abstract

The purpose of the present disclosure is to provide an oil seal device and an elevator traction machine that can maintain a sealing function for a long period of time with a simple structure. The oil seal body (24) is sandwiched between the first elastic body (25) and the second elastic body (27). The first elastic body (25) is made of a material, such as rubber, which permanently deforms over the year when the oil seal main body (24) is pressed by the second elastic body (27). With the permanent deformation of the first elastic body (25), the oil seal main body (24) can be pressed by the second elastic body (27) to slide relative to the housing (21) and the main shaft (22).

Description

Technical Field

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

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

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 4-338088 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In conventional shaft seals for elevator traction machines, such as those described above, the oil seal's lip wears the input shaft over time, degrading its sealing function. Consequently, the existing oil seal must be replaced with a new one, shifting the contact point between the oil seal and the input shaft. Furthermore, since oil seal replacement is difficult, the input shaft must be pre-formed from a high-hardness material.

[0008] The present disclosure has been made to solve the above-mentioned problems, and an object thereof is to provide an oil seal device capable of maintaining a sealing function for a long period of time with a simple structure, and an elevator hoisting machine using the oil seal device.

[0009] Means for solving problems

[0010] The oil seal device disclosed herein comprises: an oil seal body disposed between a first component and a second component; a first elastic body disposed between the first component and the second component and in contact with the oil seal body; and a second elastic body disposed between the first component and the second component and pressing the oil seal body against the first elastic body. The first elastic body is made of a material that permanently deforms over time due to the oil seal body being pressed by the second elastic body. As the first elastic body is permanently deformed, the oil seal body can slide relative to the first component and the second component while being pressed by the second elastic body.

[0011] Effects of the Invention

[0012] According to the present disclosure, the sealing function can be maintained for a long period of time with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic configuration diagram showing an elevator apparatus according to the first embodiment.

[0014] Figure 2 It is an enlarged representation Figure 1 A half-section view of the main part of the traction machine body.

[0015] Label Description

[0016] 3: Elevator traction machine, 5: Drive sheave, 21: Housing (first component), 22: Main shaft (second component), 23: Oil seal device, 24: Oil seal body, 25: First elastic body, 27: Second elastic body. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments will be described with reference to the drawings.

[0018] Implementation method 1.

[0019] Figure 1 This is a schematic diagram showing the structure of an elevator device according to Embodiment 1. Figure 1 In the embodiment, a machine room 2 is provided above a hoistway 1. An elevator traction machine 3 and a deflector pulley 6 are provided in the machine room 2.

[0020] The elevator hoisting machine 3 includes a hoisting machine body 4 and a drive sheave 5. The hoisting machine body 4 includes a hoisting machine motor (not shown) and a hoisting machine brake (not shown). The hoisting machine motor rotates the drive sheave 5. The hoisting machine brake holds the drive sheave 5 stationary. Furthermore, the hoisting machine brake applies a brake to the rotation of the drive sheave 5.

[0021] A suspension body 7 is wound around the drive sheave 5 and the deflector pulley 6. A plurality of ropes or belts are 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.

[0022] The car 8 and the counterweight 9 are suspended in the hoistway 1 via the suspension body 7. The car 8 and the counterweight 9 are moved up and down in the hoistway 1 by rotating the drive sheave 5.

[0023] A pair of car guide rails 10 and a pair of counterweight guide rails 11 are provided in the hoistway 1. Figure 1 In FIG, only one side of the car guide rail 10 and one side of the counterweight guide rail 11 are shown.

[0024] A pair of car guide rails 10 guides the car 8 in ascending and descending directions. A pair of counterweight guide rails 11 guides the counterweight 9 in ascending and descending directions.

[0025] The car 8 includes a car frame 12 and a car chamber 13. The suspension body 7 is connected to the car frame 12. The car chamber 13 is supported by the car frame 12.

[0026] Figure 2 It is an enlarged representation Figure 14 is a half-sectional view of the main part of the hoisting machine body 4. The hoisting machine body 4 includes a housing 21 as a first component, a main shaft 22 as a second component, an oil seal device 23, and a pair of bearings (not shown), in addition to the hoisting machine motor and the hoisting machine brake.

[0027] The housing 21 is provided with a shaft holding hole 21a. The main shaft 22 passes through the shaft holding hole 21a. In addition, the main shaft 22 is held in the housing 21 via a pair of bearings. Thus, the main shaft 22 can rotate relative to the housing 21 around the axis C of the main shaft 22.

[0028] The drive sheave 5 is fixed to the main shaft 22. The hoisting machine motor rotates the drive sheave 5 via the main shaft 22. That is, the drive sheave 5 rotates when the main shaft 22 rotates relative to the housing 21.

[0029] 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. An oil seal 23 is fitted into the gap 21b.

[0030] The oil seal device 23 includes an oil seal body 24 , an annular first elastic body 25 , an annular pressing member 26 , and a second elastic body 27 .

[0031] 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. In addition, the oil seal body 24 prevents the oil from passing over the oil seal body 24 and moving.

[0032] The first elastic body 25 is provided between the housing 21 and the main shaft 22. The first elastic body 25 is embedded in the shaft holding hole 21a and fixed relative to the inner peripheral surface of the shaft holding hole 21a. For example, the first elastic body 25 is press-fitted into the shaft holding hole 21a.

[0033] The oil seal body 24 contacts the 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 along the axis C. Figure 2 left and right directions.

[0034] The pressing member 26 is disposed between the housing 21 and the main shaft 22. Furthermore, the pressing member 26 is embedded in the shaft retaining hole 21a and fixed to the inner circumferential surface of the shaft retaining hole 21a. For example, the pressing member 26 is press-fitted into the shaft retaining hole 21a. Furthermore, the pressing member 26 is positioned on the side of the oil seal body 24 opposite the first elastic body 25.

[0035] The second elastic body 27 is disposed between the housing 21 and the main shaft 22. Furthermore, the second elastic body 27 is interposed between the pressing member 26 and the oil seal body 24. Furthermore, the second elastic body 27 presses the oil seal body 24 against the first elastic body 25. The oil seal body 24 is sandwiched between the first elastic body 25 and the second elastic body 27.

[0036] One or more compression springs are used as the second elastic body 27 , for example. Each compression spring is interposed between the pressing member 26 and the oil seal body 24 in a compressed state. As a result, the oil seal body 24 is constantly pressed against the first elastic body 25 by the second elastic body 27 .

[0037] The first elastic body 25 is made of a material, such as rubber, which is permanently deformed over time due to the oil seal body 24 being pressed by the second elastic body 27 .

[0038] As the first elastic body 25 is permanently deformed, the oil seal body 24 can slide relative to the housing 21 and the main shaft 22 while being pressed by the second elastic body 27 .

[0039] In such an oil seal device 23, the first elastic body 25 gradually produces permanent deformation, so-called fatigue, as the years go by. Figure 2 As the oil seal body 24 gradually moves to the right, that is, away from the pressing member 26, the force acting on the oil seal body 24 from the second elastic body 27 also gradually changes.

[0040] As a result, the contact position between the lip of the oil seal body 24 and the main shaft 22 gradually changes over time. Therefore, even if the main shaft 22 is not made of a high-hardness material, wear of the same portion of the main shaft 22 can be suppressed. Consequently, the sealing function can be maintained over a long period of time with a simple structure.

[0041] Furthermore, the first elastic body 25 is made of rubber, and the second elastic body 27 is made of a compression spring, whereby the structure can be further simplified.

[0042] Furthermore, in an elevator hoisting machine 3 equipped with the oil seal device 23 of Embodiment 1, the replacement frequency of the oil seal body 24 can be significantly reduced, thereby reducing the maintenance load. Furthermore, the sealing function can be maintained for a long period of time, thereby improving the quality of the elevator hoisting machine 3.

[0043] In the first embodiment, the main shaft 22 is a rotating shaft that rotates together with the drive sheave 5. However, the main shaft 22 may be a fixed shaft. In this case, the drive sheave 5 rotates relative to the main shaft 22 about the axis C. The first member is the drive sheave 5 or a member that rotates together with the drive sheave 5.

[0044] Thus, the main shaft 22 as the second member is a member that can rotate relative to the first member. And the drive sheave 5 rotates by the relative rotation of the main shaft 22 with respect to the first member.

[0045] Furthermore, when the elevator hoisting machine includes a speed reduction mechanism, the first member may be the rotating shaft of the speed reduction mechanism.

[0046] In addition, the type of elevator is not limited to Figure 1 Type, for example, can also be a 2:1 rope winding method.

[0047] In addition, the elevator may be a machine room-less elevator, a double-deck elevator, a single-shaft multi-car elevator, etc. The single-shaft multi-car elevator is a system in which an upper car and a lower car arranged directly below the upper car independently rise and fall in a common shaft.

[0048] In addition, the oil seal device of the present disclosure can also be applied to equipment other than the elevator hoisting machine 3 .

Claims

1. An oil seal device comprising: an oil seal body disposed between the first component and the second component; a first elastic body disposed between the first component and the second component and in contact with the oil seal body; and a second elastic body disposed between the first component and the second component, pressing the oil seal body against the first elastic body; The first elastic body is made of a material that is permanently deformed over time due to the oil seal body being pressed by the second elastic body. As the first elastic body is permanently deformed, the oil seal body can slide relative to the first component and the second component while being pressed by the second elastic body.

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

3. An elevator traction machine comprising: As the main shaft of the second component, it is capable of relative rotation with respect to the first component; a drive sheave rotated by relative rotation of the main shaft with respect to the first member; and The oil seal device according to claim 1 or 2.

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