Axle coupling device and elevator

Abstract

To provide a shaft coupling device capable of coupling in the state securing inertial force even if the axial length of one shaft among connected two shafts is less than the axial half-length of an entire shaft coupling device.SOLUTION: A shaft coupling device 1 connects a rotatable rotational shaft 103b and a rotatable driving shaft 104a facing the rotational shaft 103b in the axial direction. This coupling device 1 comprises a first member 2 fixed to the rotational shaft 103b, and a second member 3 fixed to the rotational shaft 103b and to the driving shaft 104a and connected to the first member 2. The axial length of the rotational shaft 103b is different from the axial length of the driving shaft 104a.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a shaft coupling device and an elevator.

Background Art

[0002] When transmitting the rotational force of a drive shaft to a driven shaft, for example, a shaft coupling device (coupling) that connects the drive shaft and the driven shaft is used. Patent Document 1 describes a coupling that connects the drive shaft of a motor and the rotating shaft of a pump.

[0003] The drive shaft of the motor described in Patent Document 1 extends toward the pump, and the drive shaft of the pump extends toward the motor. The drive shaft of the motor is connected to the rotating shaft of the pump via a coupling. The coupling includes a drive shaft side flange fixed to the drive shaft of the motor and a rotating shaft side flange fixed to the rotating shaft of the pump.

[0004] The drive shaft side flange extends radially outward of the drive shaft of the motor and is arranged concentrically with the drive shaft. The rotating shaft side flange extends radially outward of the rotating shaft of the pump and is arranged concentrically with the rotating shaft. The drive shaft side flange and the rotating shaft side flange are connected to each other by a plurality of connectors. When the motor is driven, the torque of the drive shaft of the motor is transmitted to the rotating shaft of the pump via the coupling.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the coupling described in Patent Document 1 cannot fix the drive shaft flange to the motor's drive shaft while ensuring inertial force unless the length of the motor's drive shaft is greater than or equal to the thickness of the drive shaft flange. Also, the rotation shaft flange cannot fix the rotation shaft to the pump's rotation shaft while ensuring inertial force unless the length of the pump's rotation shaft is greater than or equal to the thickness of the rotation shaft flange.

[0007] Therefore, the coupling described in Patent Document 1 had the problem that the overall size of the coupling was large because it required the drive shaft to be longer than the thickness of the flange on the drive shaft side, and the rotating shaft to be longer than the thickness of the flange on the rotating shaft side.

[0008] The objective of the present invention is to provide an axle coupling device and an elevator that can suppress the overall increase in size of the axle coupling device, taking into consideration the above-mentioned problems. [Means for solving the problem]

[0009] To solve the above problems and achieve the objectives of the present invention, an axis coupling device according to one aspect of the present invention connects a rotatable first axis and a rotatable second axis that is opposite to the first axis in the axial direction. This axis coupling device 2nd axis It is fixed to Second member And, fixed to the first axis and the second axis, Second member Connected First member It is equipped with the following: The axial length of the first axis and the axial length of the second axis are different. Furthermore, an elevator according to one aspect of the present invention comprises a first rotating machine having a rotatable first shaft, a second rotating machine having a rotatable second shaft facing the first shaft in the axial direction, and the shaft coupling device connecting the first shaft and the second shaft. [Effects of the Invention]

[0010] According to the above configuration of the shaft coupling device and elevator, it is possible to suppress an increase in the overall size of the shaft coupling device. Furthermore, issues, configurations, and effects other than those mentioned above will be clarified by the following description of the embodiments. [Brief explanation of the drawing]

[0011] [Figure 1] This is a front view of a hydraulic system using a shaft coupling device according to the first embodiment. [Figure 2] This is a front view of the first member of the shaft coupling device according to the first embodiment. [Figure 3] This is a cross-sectional view along line AA shown in Figure 2. [Figure 4] This is a front view of the second member of the shaft coupling device according to the first embodiment. [Figure 5] This is a cross-sectional view along the BB line shown in Figure 4. [Figure 6] This is a cross-sectional view showing the motor's drive shaft and the pump's rotating shaft connected by the shaft coupling device according to the first embodiment. [Figure 7] This is a cross-sectional view showing the motor's drive shaft and the pump's rotating shaft connected by the shaft coupling device according to the second embodiment. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In this specification and drawings, components having substantially the same function or configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0013] 1. First Embodiment Hereinafter, a shaft coupling device according to the first embodiment of the present invention will be described with reference to Figures 1 to 6.

[0014] [Hydraulic System Configuration] First, the configuration of the hydraulic system using the shaft coupling device according to the first embodiment will be described with reference to Figure 1. Figure 1 is a front view of a hydraulic system using a shaft coupling device according to the first embodiment.

[0015] The hydraulic device 100 shown in FIG. 1 is applied to, for example, a hydraulic elevator. The hydraulic device 100 supplies or recovers pressurized oil to / from the hydraulic jack of the hydraulic elevator. The hydraulic device 100 includes a frame 101, an oil tank 102, a hydraulic pump 103, a drive motor 104, and a muffler 105 installed on the frame 101.

[0016] The frame 101 is formed in a rectangular parallelepiped shape. The oil tank 102 and the muffler 105 are fixed to the upper surface of the frame 101. Oil is stored inside the oil tank 102. The hydraulic pump 103 and the drive motor 104 are arranged inside the frame 101. The hydraulic pump 103 and the drive motor 104 are supported by the frame 101 via a plurality of vibration isolators 108.

[0017] The hydraulic pump 103 is located below the oil tank 102. The drive motor 104 is located below the muffler 105. A hydraulic pressure adjusting device 106 is provided between the hydraulic pump 103 and the oil tank 102. The hydraulic pump 103 and the drive motor 104 are arranged coaxially. And, the rotation shaft 103a of the hydraulic pump 103 and the drive shaft 104a of the drive motor 104 are connected in series using a shaft coupling device 1.

[0018] The shaft coupling device 1 has a first member 2 fixed to the rotation shaft 103a of the hydraulic pump 103 and a second member 3 fixed to the drive shaft 104a of the drive motor 104. The first member 2 and the second member 3 are fastened using bolts 4 and nuts 5. The hydraulic pump 103 corresponds to the first machine according to the present invention, and the rotation shaft 103a corresponds to the first shaft according to the present invention. Also, the drive motor 104 corresponds to the second machine according to the present invention, and the drive shaft 104a corresponds to the second shaft according to the present invention.

[0019] The hydraulic pump 103 is connected to the oil tank 102 via piping 107a. The hydraulic pump 103 is also connected to the hydraulic regulator 106 via piping 107b. The hydraulic regulator 106 is connected to the muffler 105 via piping 107c. The muffler 105 is connected to the hydraulic jack via piping not shown.

[0020] The drive motor 104 is, for example, an inverter motor. The drive motor 104's forward rotation, reverse rotation, stopping, and rotational speed are controlled by a control panel (not shown). When the drive motor 104 rotates forward, the hydraulic pump 103 connected by the shaft coupling device 1 also rotates forward. As a result, the hydraulic pump 103 draws oil from the oil tank 102 through the piping 107a and pressurizes it. The hydraulic pump 103 then sends the pressurized oil to the hydraulic pressure adjustment device 106 through the piping 107b.

[0021] The hydraulic regulator 106 adjusts the pressure of the supplied oil. The hydraulic regulator 106 then sends the regulated oil to the muffler 105 via piping 107c. The hydraulic regulator 106 also returns any excess oil generated during the oil adjustment process to the oil tank 102 via piping 107d. The oil sent to the muffler 105 is then supplied to the hydraulic jack via piping (not shown). This causes the elevator car of the hydraulic elevator to rise.

[0022] On the other hand, when the drive motor 104 rotates in reverse, the hydraulic pump 103 connected by the shaft coupling device 1 also rotates in reverse. As a result, the hydraulic pump 103 draws oil from the hydraulic jack via the muffler 105 and piping 107c, etc., and sends it to the oil tank 102. This causes the elevator car of the hydraulic elevator to descend. To stop the elevator car, the hydraulic adjustment device 106 cuts off the oil flow and stops the drive motor 104.

[0023] [Configuration of the first component of the shaft coupling device] Next, the configuration of the first member 2 of the shaft coupling device 1 will be explained using Figures 2 and 3. Figure 2 is a front view of the first member 2. Figure 3 is a cross-sectional view along line AA shown in Figure 2.

[0024] As shown in Figures 2 and 3, the first member 2 has a cylindrical first fixed cylinder portion 21 and a first connecting flange portion 22 that is continuous with the first fixed cylinder portion 21.

[0025] One axial end face 21a of the first fixed cylinder portion 21 faces the hydraulic pump 103 (see Figure 1). The other axial end face 21b of the first fixed cylinder portion 21 faces the second member 3. The diameter of the first fixed cylinder portion 21 is larger than the diameters of the rotating shaft 103a and the drive shaft 104a. The axial length of the first fixed cylinder portion 21 is set to A1.

[0026] The first fixed cylindrical portion 21 has a first fitting hole 23 and a second fitting hole 24. The first fitting hole 23 is concentric with the first fixed cylindrical portion 21 and is formed in a circular shape with a diameter B. The first fitting hole 23 extends from one end face 21a of the first fixed cylindrical portion 21 to the middle portion of the first fixed cylindrical portion 21. The first fitting hole 23 fits onto the rotating shaft 103a of the hydraulic pump 103.

[0027] The second fitting hole 24 is concentric with the first fixed cylindrical portion 21 and is formed in a circular shape with a diameter of C. The diameter C of the second fitting hole 24 is larger than the diameter B of the first fitting hole 23. The second fitting hole 24 extends from the other end face 21b of the first fixed cylindrical portion 21 to the middle portion of the first fixed cylindrical portion 21. The second fitting hole 24 communicates with the first fitting hole 23. The second fitting hole 24 fits onto the drive shaft 104a of the drive motor 104.

[0028] The first connecting flange portion 22 protrudes radially outward from the circumferential surface on the other axial end side of the first fixed cylinder portion 21. The first connecting flange portion 22 is formed in an annular shape concentric with the first fixed cylinder portion 21. The axial length (thickness) A2 of the first connecting flange portion 22 is shorter than the axial length A1 of the first fixed cylinder portion 21.

[0029] The first connecting flange portion 22 has a plurality of through-holes 25 for screws. The plurality of through-holes 25 for screws penetrate the first connecting flange portion 22 in the axial direction. The plurality of through-holes 25 for screws are arranged at equal intervals in the circumferential direction of the first connecting flange portion 22 (first fixed cylinder portion 21). Bolts 4 pass through the plurality of through-holes 25 for screws.

[0030] [Configuration of the second component of the shaft coupling device] Next, the configuration of the second member 3 of the shaft coupling device 1 will be explained using Figures 4 and 5. Figure 4 is a front view of the second member 3. Figure 5 is a cross-sectional view along the line BB shown in Figure 4.

[0031] As shown in Figures 4 and 5, the second member 3 has a cylindrical second fixed cylinder portion 31 and a second connecting flange portion 32 that is continuous with the second fixed cylinder portion 31.

[0032] One axial end face 31a of the second fixed cylindrical portion 31 faces the drive motor 104 (see Figure 1). The other axial end face 31b of the second fixed cylindrical portion 31 faces the first member 2. The diameter of the second fixed cylindrical portion 31 is approximately equal to the diameter of the first fixed cylindrical portion 21 of the first member 2. The axial length of the second fixed cylindrical portion 31 is set to D1.

[0033] The axial length A1 of the first fixed cylindrical portion 21 (first member 2) is longer than the axial length D1 of the second fixed cylindrical portion 31 (second member 3). This allows the first fixed cylindrical portion 21 to be fitted with the rotating shaft 103a, which has a shorter axial length, while ensuring inertial force. In addition, the diameter of the second fixed cylindrical portion 31 is approximately equal to the diameter of the first fixed cylindrical portion 21.

[0034] The second fixed cylindrical portion 31 has a fitting hole 33. The fitting hole 33 is concentric with the second fixed cylindrical portion 31 and is formed in a circular shape with a diameter C. The fitting hole 33 penetrates the second fixed cylindrical portion 31 in the axial direction. The fitting hole 33 fits onto the drive shaft 104a of the drive motor 104.

[0035] The second connecting flange 32 protrudes radially outward from the circumferential surface on the other axial end of the second fixed cylinder portion 31. The second connecting flange 32 is formed in an annular shape concentric with the second fixed cylinder portion 31. The axial length (thickness) D2 of the second connecting flange 32 is shorter than the axial length D1 of the second fixed cylinder portion 31. The outer diameter of the second connecting flange 32 is approximately equal to the outer diameter of the first fixed cylinder portion 21.

[0036] The second connecting flange portion 32 has a plurality of screw holes 34. The plurality of screw holes 34 penetrate the second connecting flange portion 32 in the axial direction. The plurality of screw holes 34 are arranged at equal intervals in the circumferential direction of the second connecting flange portion 32 (second fixed cylindrical portion 31). The plurality of screw holes 34 are opposite to the plurality of through holes 25 for screws in the first member 2 (see Figures 2 and 3). Bolts 4 are screwed into the plurality of screw holes 34.

[0037] [Shaft coupling using a shaft coupling device] Next, the connection between the rotating shaft 103a and the drive shaft 104a by the shaft coupling device 1 will be explained with reference to Figure 6. Figure 6 is a cross-sectional view showing the state in which the drive shaft 104a of the drive motor 104 and the rotating shaft 103a of the hydraulic pump 103 are connected by the shaft coupling device 1.

[0038] When connecting the drive shaft 104a of the drive motor 104 and the rotating shaft 103a of the hydraulic pump 103, first, the second member 3 is fixed to the drive shaft 104a. In this embodiment, the second member 3 is fixed to the drive shaft 104a by shrink-fitting. That is, the second member 3 is heated to expand, and the drive shaft 104a is inserted through the fitting hole 33. Then, the second member 3 is cooled to contract, and the second member 3 is fixed to the drive shaft 104a.

[0039] Next, the first member 2 is fixed to the drive shaft 104a and the rotating shaft 103a. That is, the first member 2 is heated to expand, the rotating shaft 103a is inserted through the first fitting hole 23, and the drive shaft 104a is inserted through the second fitting hole 24.

[0040] Then, the first member 2 and the second member 3 are fastened together using bolts 4 and nuts 5. Specifically, the bolts 4 are screwed into multiple screw holes 34 in the second member 3, and the bolts 4 are passed through multiple screw holes 25 in the first member 2. Next, the nuts 5 are screwed onto the bolts 4 that have passed through the multiple screw holes 25. After that, the first member 2 is cooled and shrunk, and the first member 2 is fixed to the drive shaft 104a and the rotating shaft 103a.

[0041] As shown in Figure 6, in this embodiment, the axial length A1 of the first member 2 and the axial length D1 of the second member 3 are made different. That is, the axial length A1 of the first member 2 is longer than the axial length D1 of the second member 3. As a result, even if the axial length of the rotating shaft 103a is less than half the axial length (A1 + D1) of the shaft coupling device 1, the first member 2 can be fixed to the rotating shaft 103a while ensuring inertial force. Consequently, the shaft coupling device 1 can connect the rotating shaft 103a and the drive shaft 104a while ensuring inertial force.

[0042] The drive shaft 104a, which protrudes from the second member 3, is fitted into the second fitting hole 24 of the first member 2. This allows the axial length of the shaft coupling device 1 to be shortened. As a result, the distance between the hydraulic pump 103 and the drive motor 104 can be shortened, and the hydraulic device 100 can be made more compact.

[0043] The outer diameters of the first connecting flange 22 of the first member 2 and the second connecting flange 32 of the second member 3 are set to a length that does not protrude beyond the outer circumferential surface of the hydraulic pump 103 and the drive motor 104. This prevents the shaft coupling device 1 from interfering with other components of the hydraulic system 100 (for example, the frame 101 and the hydraulic adjustment device 106).

[0044] The axial length A2 of the first connecting flange 22 is shorter than the axial length A1 of the first fixed cylinder 21. This ensures space for inserting a tool between the first connecting flange 22 and the drive motor 104. Furthermore, the axial length (thickness) D2 of the second connecting flange 32 is shorter than the axial length D1 of the second fixed cylinder 31. This ensures space for inserting a tool between the second connecting flange 32 and the hydraulic pump 103. As a result, fastening operations using bolts 4 and nuts 5 can be easily performed.

[0045] Furthermore, a screw buffer 41 is interposed between the inner circumferential surface of the multiple screw through holes 25 in the first member 2 and the bolt 4. The screw buffer 41 is formed in a cylindrical shape from, for example, rubber. By using the screw buffer 41, vibrations from the first member 2 can be prevented from being transmitted to the bolt 4. As a result, the progression of loosening of the bolt 4 can be suppressed.

[0046] Furthermore, a cushioning material 42 is interposed between the first connecting flange portion 22 of the first member 2 and the second connecting flange portion 32 of the second member 3. Examples of the cushioning material 42 include washers and rubber rings. This prevents the first member 2 and the second member 3 from coming into contact, thereby preventing or suppressing the transmission of vibrations between the first member 2 and the second member 3. As a result, the connection between the drive shaft 104a and the rotating shaft 103a by the shaft coupling device 1 can be strengthened.

[0047] 2. Second Embodiment Next, a shaft coupling device according to a second embodiment of the present invention will be described with reference to Figure 7. Figure 7 is a cross-sectional view showing the state in which the drive shaft 104a of the drive motor 104 and the rotating shaft 103a of the hydraulic pump 103 are connected by the shaft coupling device 1A according to the second embodiment.

[0048] The shaft coupling device 1A shown in Figure 7 has the same configuration as the shaft coupling device 1 according to the first embodiment (see Figure 6). The differences between the shaft coupling device 1A and the shaft coupling device 1 according to the first embodiment are the rotating shaft 103b of the hydraulic pump 103 and the first member 7. Therefore, the rotating shaft 103b and the first member 7 will be described here, and the description of the configuration common to the shaft coupling device 1 according to the first embodiment will be omitted.

[0049] As shown in Figure 7, the diameter of the rotating shaft 103b is the same as the diameter of the drive shaft 104a of the drive motor 104. The axial length of the rotating shaft 103b is the same as the axial length of the rotating shaft 103a according to the first embodiment, and is less than half the axial length of the shaft coupling device 1A. In other words, the axial length of the shaft coupling device 1A is the same as the axial length of the shaft coupling device 1 according to the first embodiment.

[0050] [Configuration of the first component of the shaft coupling device] The first member 7 has a cylindrical first fixed cylinder portion 71 and a first connecting flange portion 72 that is continuous with the first fixed cylinder portion 71.

[0051] One axial end face 71a of the first fixed cylindrical portion 71 faces the hydraulic pump 103. The other axial end face 71b of the first fixed cylindrical portion 71 faces the second member 3. The diameter of the first fixed cylindrical portion 71 is larger than the diameters of the rotating shaft 103a and the drive shaft 104a. The axial length of the first fixed cylindrical portion 71 is set to A1.

[0052] The first fixed cylindrical portion 71 has a fitting hole 73. The fitting hole 73 is concentric with the first fixed cylindrical portion 71 and is formed in a circular shape with a diameter C. The fitting hole 73 penetrates the first fixed cylindrical portion 71 in the axial direction. The fitting hole 73 fits onto the rotating shaft 103a of the hydraulic pump 103 and the drive shaft 104a of the drive motor 104.

[0053] The first connecting flange portion 72 protrudes radially outward from the circumferential surface on the other axial end side of the first fixed cylinder portion 71. The first connecting flange portion 72 is formed in an annular shape concentric with the first fixed cylinder portion 71. The axial length (thickness) A2 of the first connecting flange portion 72 is shorter than the axial length A1 of the first fixed cylinder portion 71.

[0054] The first connecting flange portion 72 has a plurality of through-holes 75 for screws. The plurality of through-holes 75 penetrate the first connecting flange portion 72 in the axial direction. The plurality of through-holes 75 for screws are arranged at equal intervals in the circumferential direction of the first connecting flange portion 72 (first fixed cylinder portion 71). Bolts 4 pass through the plurality of through-holes 75 for screws.

[0055] [Shaft coupling using a shaft coupling device] Next, the connection between the rotating shaft 103b and the drive shaft 104a by the shaft coupling device 1A will be explained with reference to Figure 7.

[0056] When connecting the drive shaft 104a of the drive motor 104 and the rotating shaft 103b of the hydraulic pump 103, first, the second member 3 is fixed to the drive shaft 104a. Next, the first member 7 is fixed to the drive shaft 104a and the rotating shaft 103b. That is, the first member 2 is heated to expand, and the rotating shaft 103b is inserted into the fitting hole 73 from one axial end of the first fixing cylinder portion 71, while the drive shaft 104a is inserted into the fitting hole 73 from the other axial end of the first fixing cylinder portion 71. Then, the first member 7 and the second member 3 are fastened together using bolts 4 and nuts 5. After that, the first member 7 is cooled to contract, and the first member 7 is fixed to the drive shaft 104a and the rotating shaft 103b.

[0057] In the second embodiment as well, the axial length A1 of the first member 7 and the axial length D1 of the second member 3 are made different. That is, the axial length A1 of the first member 7 is longer than the axial length D1 of the second member 3. As a result, even if the axial length of the rotating shaft 103b is less than half the axial length (A1 + D1) of the shaft coupling device 1A, the first member 7 can be fixed to the rotating shaft 103b while ensuring inertial force. Consequently, the shaft coupling device 1A can connect the rotating shaft 103b and the drive shaft 104a while ensuring inertial force.

[0058] 3. Summary (1) The shaft coupling device 1 according to the first embodiment described above connects a rotatable rotating shaft 103a (first shaft) and a rotatable drive shaft 104a (second shaft) that faces the rotating shaft 103a in the axial direction. This shaft coupling device 1 comprises a first member 2 fixed to the rotating shaft 103a and a second member 3 fixed to the rotating shaft 103a and the drive shaft 104a and connected to the first member 2. The axial length of the rotating shaft 103a and the axial length of the drive shaft 104a are different. This makes it possible to suppress an increase in the overall size of the shaft coupling device 1 when the axial length of the rotating shaft 103a and the axial length of the drive shaft 104a are different.

[0059] (2) The first member 2 of the shaft coupling device 1 according to the first embodiment described above has a first fitting hole 23 that fits onto the rotating shaft 103a (first shaft) and a second fitting hole 24 that fits onto the drive shaft 104a (second shaft). The diameter of the first fitting hole 23 is different from the diameter of the second fitting hole 24. This allows the axial length of the shaft coupling device 1 to be shortened. Furthermore, it enables easy connection of the rotating shaft 103a and the drive shaft 104a, which have different diameters. Additionally, even when the first fitting hole 23 and the second fitting hole 24 are in communication, the larger diameter shaft (drive shaft 104a) can be easily positioned relative to the first member 2.

[0060] (3) The drive shaft 104a (second shaft) according to the first embodiment described above has a longer axial length than the rotation shaft 103a (first shaft). Furthermore, the axial length of the first member 2 is longer than the axial length of the second member 3. As a result, even if the axial length of the rotating shaft 103a is less than half the axial length (A1 + D1) of the shaft coupling device 1, the first member 2 can be fixed to the rotating shaft 103a while maintaining inertial force. Consequently, the shaft coupling device 1 can connect the rotating shaft 103a and the drive shaft 104a while maintaining inertial force.

[0061] (4) The first member 2 according to the first embodiment described above has a first fixed cylindrical portion 21 to which the rotating shaft 103a (first shaft) is fixed, and a first connecting flange portion 22 that protrudes radially outward from one axial end of the first fixed cylindrical portion 21. The second member 3 has a second fixed cylindrical portion 31 to which the drive shaft 104a (second shaft) is fixed, and a second connecting flange portion 32 that protrudes radially outward from one axial end of the second fixed cylindrical portion 31. The first connecting flange portion 22 and the second connecting flange portion 32 are fastened together using a plurality of bolts 4 (screws). This allows for space to be secured for inserting the tools used in the fastening process.

[0062] (5) The multiple bolts 4 (screws) according to the first embodiment described above are screwed onto nuts 5 located on the first connecting flange portion 22 side. A screw buffer material 41 is interposed between the multiple screw through holes 25 of the first connecting flange portion 22 and the multiple bolts 4. This prevents vibrations from the first member 2 from being transmitted to the bolt 4. As a result, the fastening using the bolt 4 becomes less likely to loosen.

[0063] (6) The radial lengths of the first member 2 and the second member 3 according to the first embodiment described above are set to a length that does not protrude outward from at least one outer peripheral surface of the hydraulic pump 103 (rotating machine) having a rotating shaft 103a (first shaft) or the drive motor 104 (rotating machine) having a drive shaft 104a (second shaft). This prevents the shaft coupling device 1 from interfering with other components of the hydraulic system 100, which has a hydraulic pump 103 and a drive motor 104 (for example, the frame 101 and the hydraulic adjustment device 106).

[0064] (7) A cushioning material is interposed between the first member 2 and the second member 3 according to the first embodiment described above. This prevents or suppresses the transmission of vibrations between the first member 2 and the second member 3, and allows for a firm connection between the rotating shaft 103a and the drive shaft 104a.

[0065] (8) The elevator according to the first embodiment described above comprises a hydraulic pump 103 (first rotating machine) having a rotatable rotating shaft 103a (first shaft), a drive motor 104 (second rotating machine) having a rotatable drive shaft 104a (second shaft) facing the rotating shaft 103a in the axial direction, and a shaft coupling device 1 that connects the rotating shaft 103a and the drive shaft 104a. The shaft coupling device 1 comprises a first member 2 fixed to the rotating shaft 103a, and a second member 3 fixed to the rotating shaft 103a and the drive shaft 104a and connected to the first member 2. The axial length of the rotating shaft 103a and the axial length of the drive shaft 104a are different. This makes it possible to suppress an increase in the overall size of the coupling when the axial length of the rotating shaft 103a and the axial length of the drive shaft 104a are different.

[0066] (9) The hydraulic pump 103 according to the first embodiment described above raises and lowers the elevator car. As a result, even if the axial lengths of the rotating shaft 103a of the hydraulic pump 103 and the drive shaft 104a of the drive motor 104 in a hydraulic elevator are different, the rotating shaft 103a and the drive shaft 104a can be connected by the shaft coupling device 1.

[0067] The embodiments of the present invention, including their effects, have been described above. However, the shaft coupling device of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the invention as described in the claims.

[0068] For example, the shaft coupling devices 1 and 1A according to the first and second embodiments connect the rotating shaft of a pump to the drive shaft of a drive motor, but the shaft coupling device according to the present invention may connect, for example, the drive shaft of a hoisting machine to the rotating shaft of a sheave.

[0069] In the first embodiment, the first member 2 was fixed to the rotating shaft 103a and the drive shaft 104a by shrink fitting. The second member 3 was also fixed to the drive shaft 104a by shrink fitting. However, the fixing of the first member and the second member to the shaft according to the present invention is not limited to shrink fitting, and they may be fixed by other methods, such as screw fastening.

[0070] In the first embodiment, the first member 2 and the second member are connected by fastening with screws (bolts and nuts). However, the connection between the first member 2 and the second member according to the present invention is not limited to fastening with screws, and may be connected by other methods, such as crimping.

[0071] Furthermore, the embodiments described above are explained in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those comprising all the described configurations. It is also possible to replace parts of the configuration of one embodiment with those of another embodiment, and to add configurations from other embodiments to the configuration of one embodiment. Additionally, it is possible to add, delete, or replace parts of the configuration of each embodiment with those of other embodiments.

[0072] In this specification, although terms such as "parallel," "perpendicular," and "orthogonal" are used, these do not mean only strictly "parallel," "perpendicular," and "orthogonal," but rather include states such as "approximately parallel," "approximately perpendicular," and "approximately orthogonal," which are within a range in which they can perform their functions. [Explanation of symbols]

[0073] 1,1A…Shaft coupling device, 2,7…First member, 3…Second member, 4…Bolt, 5…Nut, 21,71…First fixed cylinder part, 22,72…First connecting flange part, 23…First fitting hole, 24…Second fitting hole, 25,75…Through hole for screw, 31…Second fixed cylinder part, 32…Second connecting flange part, 33…Fitting hole, 34…Screw hole, 41…Screw cushioning material, 42…Cushioning material, 73…Fitting hole, 100…Hydraulic device, 101…Frame, 102…Oil tank, 103…Hydraulic pump, 103a,103b…Rotating shaft, 104…Drive motor, 104a…Drive shaft, 105…Muffler, 106…Hydraulic adjustment device, 107a, 107b, 107c, 107d... Piping, 108... Vibration isolation body

Claims

1. An axial coupling device for connecting a rotatable first shaft and a rotatable second shaft that is axially opposed to the first shaft, A second member fixed to the second shaft, The first member is fixed to the first shaft and the second shaft and connected to the second member, The axial length of the first axis and the axial length of the second axis are different. Shaft coupling device.

2. The first member has a first fitting hole that fits onto the first shaft and a second fitting hole that fits onto the second shaft. The diameter of the first fitting hole is different from the diameter of the second fitting hole. The shaft coupling device according to claim 1.

3. The second axis has a longer axial length than the first axis. The axial length of the first member is longer than the axial length of the second member. The shaft coupling device according to claim 2.

4. The first member has a first fixed cylindrical portion to which the first shaft is fixed, and a first connecting flange portion that protrudes radially outward from one axial end of the first fixed cylindrical portion. The second member has a second fixed cylindrical portion to which the second shaft is fixed, and a second connecting flange portion that protrudes radially outward from one axial end of the second fixed cylindrical portion. The first connecting flange and the second connecting flange are fastened together using a plurality of screws. The shaft coupling device according to claim 2.

5. The first connecting flange has a plurality of through holes through which the plurality of screws pass, The aforementioned plurality of screws are bolts that are screwed into nuts located on the first connecting flange side. A screw cushioning material is interposed between the plurality of through holes in the first connecting flange and the plurality of screws. The shaft coupling device according to claim 4.

6. The radial lengths of the first and second members are set so that they do not protrude outward from at least one of the outer circumferential surfaces of the rotating machine having the first shaft or the rotating machine having the second shaft. The shaft coupling device according to claim 1.

7. A cushioning material is interposed between the first member and the second member. The shaft coupling device according to claim 1.

8. An elevator comprising: a first rotating machine having a rotatable first shaft; a second rotating machine having a rotatable second shaft facing the first shaft in the axial direction; and an axial coupling device connecting the first shaft and the second shaft, The aforementioned shaft coupling device is A second member fixed to the second shaft, The first member is fixed to the first shaft and the second shaft and connected to the second member, The axial length of the first axis and the axial length of the second axis are different. Elevator.

9. The first rotating machine is a hydraulic pump for raising and lowering the elevator car. The second rotating machine is a motor. The elevator according to claim 8.

Images