Drive transmission device and lifting device comprising drive transmission device

Abstract

To connect two shafts arranged on the same axis with a gap for inserting a transmission member with a high degree of freedom, in a drive transmission device that uses an endless transmission member such as a belt.SOLUTION: A drive transmission device 2 comprises: a reference shaft 20 arranged on a reference axis As; a first target shaft 21 and a second target shaft 22 arranged on a target axial core At; a first rotor 210 attached to the first target shaft 21; a second rotor 220 attached to the second target shaft 22; a first transmission member 21b wound around the first rotor 210; a second transmission member 22b wound around the second rotor 220; and a shaft joint 23. The first target shaft 21 and the second target shaft 22 are arranged with a gap in an axial direction L, and the first rotor 210 and the second rotor 220 are arranged on the target axial core At so as to be aligned in the axial direction L. The shaft joint 23 is connected to the first rotor 210 and the second rotor 220.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a drive transmission device and a lifting device equipped with the drive transmission device. [Background technology]

[0002] For example, Japanese Patent Laid-Open No. 2004-067348 (Patent Document 1) discloses a board transport device for transporting printed circuit boards, which utilizes a drive transmission device that transmits driving force generated by a motor. In the following description of the background art, the reference numerals in parentheses refer to those in Patent Document 1.

[0003] In the invention disclosed in Patent Document 1, the drive pulleys (14A, 14B) that drive the conveyor belts (13A, 13B) are connected to one belt drive shaft (20) so as to rotate integrally, and are configured to rotate synchronously on the same axis as the belt drive shaft (20) rotates.

[0004] The belt drive shaft (20) includes a pair of drive shafts (20a, 20b) arranged coaxially with a gap (25) between them. These drive shafts (20a, 20b) are directly connected by a shaft coupling (26). The shaft coupling (26) is detachable from the drive shafts (20a, 20b). The gap (25) exposed by removing the shaft coupling (26) is used when removing the conveyor belt (13A) from the substrate conveyor device (1) for maintenance or other purposes. That is, the conveyor belt (13A) can be removed from the substrate conveyor device (1) by inserting the conveyor belt (13A) through the gap (25). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-067348 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, the pair of drive shafts (20a, 20b) are configured to be directly connected to each other by the shaft coupling (26). Therefore, in the configuration disclosed in Patent Document 1, the size of the shaft coupling (26) is restricted by the size and shape of the drive shafts (20a, 20b), which in turn tends to limit the degree of freedom of the shaft connection structure.

[0007] In view of the above situation, it is desirable to realize a technology that allows for a high degree of freedom in connecting two shafts arranged on the same axis with a gap provided for inserting the transmission member in a drive transmission device that uses an endless transmission member such as a belt. [Means for solving the problem]

[0008] a reference axis disposed on the reference axis center; a first symmetric axis and a second symmetric axis arranged on a symmetric axis that is another axis parallel to the reference axis; a first reference rotor and a second reference rotor attached to the reference shaft; a first rotating body attached to the first symmetrical axis; a second rotating body attached to the second symmetrical axis; an endless first transmission member wound around the first reference rotor and the first rotor; an endless second transmission member wound around the second reference rotor and the second rotor; a shaft coupling for connecting the first symmetric shaft and the second symmetric shaft; Equipped with A direction parallel to the reference axis and the target axis is defined as an axial direction, The first symmetrical axis and the second symmetrical axis are arranged with a gap in the axial direction, the first rotating body and the second rotating body are arranged on the symmetrical axis so as to be aligned in the axial direction, The shaft coupling is connected to the first rotating body and the second rotating body.

[0009] According to this configuration, the first symmetrical shaft and the second symmetrical shaft are arranged with a gap in the axial direction. By removing the shaft coupling and forming a gap between the first rotating body and the second rotating body, when replacing the first transmission member or the second transmission member, the first transmission member removed from the first rotating body or the second transmission member removed from the second rotating body can be easily removed through the gap between the first symmetrical shaft and the second symmetrical shaft. Furthermore, according to this configuration, instead of directly connecting the first symmetrical shaft and the second symmetrical shaft, the first symmetrical shaft and the second symmetrical shaft can be indirectly connected by connecting the first rotating body and the second rotating body with a shaft coupling. Therefore, the shaft coupling that functions to connect the first symmetrical shaft and the second symmetrical shaft can be less restricted by the size and shape of the first symmetrical shaft and the second symmetrical shaft. Therefore, according to this configuration, the first symmetrical shaft and the second symmetrical shaft, which are arranged on the same axis and have a gap for inserting the first transmission member or the second transmission member, can be connected with a high degree of freedom.

[0010] Further features and advantages of the techniques according to the present disclosure will become more apparent from the following description of exemplary and non-limiting embodiments, which proceeds with reference to the drawings. [Brief explanation of the drawings]

[0011] [Figure 1] Diagram showing an example of using a lifting device [Figure 2] Schematic diagram of the drive transmission device [Figure 3] FIG. 1 is a diagram showing a connection structure between a first symmetrical axis and a second symmetrical axis; [Figure 4] FIG. 1 is a diagram showing a connection structure between a first symmetrical axis and a second symmetrical axis; [Figure 5] FIG. 10 is a diagram showing the flow of work for removing the first transmission member. [Figure 6] FIG. 10 is a diagram showing the flow of work for removing the first transmission member. [Figure 7] FIG. 10 is a diagram showing the flow of work for removing the first transmission member. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of a drive transmission device and a lifting device including the drive transmission device will be described with reference to the drawings.

[0013] FIG. 1 illustrates an example of a transport facility. In the example shown in FIG. 1, the transport facility includes a transport vehicle V that transports an item W. The transport vehicle V includes a traveling section Va that travels along a traveling rail R and an item holding section Vb that holds the item W. The traveling rail R is disposed at a position spaced above the floor, and the transport vehicle V is configured as a so-called ceiling transport vehicle that travels near the ceiling. Such transport facility constitutes, for example, part of a semiconductor manufacturing factory and is used in a clean room maintained in a clean environment. In this case, the item W is a substrate storage container (so-called FOUP: Front Opening Unified Pod) that stores substrates (such as wafers or panels), a reticle storage container (so-called reticle pod) that stores reticles, or the like.

[0014] The lifting device 100 equipped with the drive transmission device 2 is provided in the above-described conveying facility. However, this is merely an example, and the facility in which the drive transmission device 2 and the lifting device 100 equipped with the drive transmission device 2 are used is not limited to the above-described conveying facility.

[0015] As shown in FIG. 1, a lifting device 100 equipped with a drive transmission device 2 includes a drive source M, a lifting mechanism 1 driven by the drive source M, and a lifted body R1 lifted and lowered by the lifting mechanism 1.

[0016] The driving source M includes a motor and a reducer. The driving source M is configured to generate a driving force that is transmitted by the drive transmission device 2, as will be described in detail later.

[0017] In this embodiment, the lifted body R1 is a rail-like member that supports the traveling section Va of the transport vehicle V. The lifted body R1 is configured to be raised and lowered by the lifting mechanism 1 so that its position can be changed between a reference position that is continuous with the traveling rail R and a retracted position that is away from the traveling rail R.

[0018] The lifted body R1 is positioned at the same height as the traveling rail R in the reference position, and is positioned below the traveling rail R in the retracted position. When the lifted body R1 is positioned at the reference position, the transport vehicle V can transfer from the traveling rail R to the lifted body R1. When the transport vehicle V has transferred to the lifted body R1, the lifted body R1 moves from the reference position to the retracted position, and the transport vehicle V is positioned below the traveling rail R. The lifting device 100 is used, for example, when maintenance of the transport vehicle V is being performed.

[0019] The lifting mechanism 1 includes a first output rotor 11r, a second output rotor 12r, a first wound member 11b wound around the first output rotor 11r so as to be freely wound up and unwound, and a second wound member 12b wound around the second output rotor 12r so as to be freely wound up and unwound.

[0020] The first output rotor 11r and the second output rotor 12r are configured to output a driving force generated by a driving source M to raise and lower the lifted object R1. In this embodiment, a plurality of first output rotors 11r (two in the illustrated example) are arranged coaxially. Also, a plurality of second output rotors 12r (two in the illustrated example) are arranged coaxially.

[0021] The first and second wound members 11b and 12b are wound by the first and second output rotors 11r and 12r, respectively, causing the lifted body R1 to rise. The first and second wound members 11b and 12b are unwound from the first and second output rotors 11r and 12r, causing the lifted body R1 to descend. In this embodiment, the first and second wound members 11b and 12b are connected to the lifted body R1 at different locations. This makes it easy to lift and lower the lifted body R1 while maintaining the horizontal position.

[0022] The first wound member 11b and the second wound member 12b are configured using, for example, belts. In this case, the first output rotor 11r and the second output rotor 12r are configured using pulleys.

[0023] FIG. 2 shows a schematic configuration of the drive transmission device 2. The drive transmission device 2 is configured to transmit a driving force via multiple shafts. These multiple shafts are arranged based on two parallel axes. Here, one axis is referred to as the "reference axis As" and the other axis is referred to as the "target axis At."

[0024] Furthermore, the direction parallel to the reference axis As and the target axis At is defined as the "axial direction L." One side in the axial direction L is defined as the "first axial side L1," and the other side is defined as the "second axial side L2."

[0025] As shown in Figure 2, the drive transmission device 2 includes a reference axis 20 arranged on the reference axis As, a first symmetric axis 21 and a second symmetric axis 22 arranged on an symmetric axis At which is another axis parallel to the reference axis As, a first reference rotating body 200A and a second reference rotating body 200B attached to the reference axis 20, a first rotating body 210 attached to the first symmetric axis 21, a second rotating body 220 attached to the second symmetric axis 22, an endless first transmission member 21b wound around the first reference rotating body 200A and the first rotating body 210, an endless second transmission member 22b wound around the second reference rotating body 200B and the second rotating body 220, and a shaft coupling 23 for connecting the first symmetric axis 21 and the second symmetric axis 22.

[0026] In this embodiment, the reference shaft 20 is connected to a driving source M. The reference shaft 20 is an input shaft for inputting the driving force generated by the driving source M.

[0027] The first reference rotor 200A and the second reference rotor 200B are fixed to the same reference shaft 20 and configured to rotate synchronously with each other. In this embodiment, the first reference rotor 200A and the second reference rotor 200B are configured using pulleys.

[0028] The first transmission member 21b, which is wound around the first reference rotor 200A on the reference axis As, is wound around the first rotor 210 on the symmetric axis At. As a result, the driving force input to the reference shaft 20 is transmitted to the first rotor 210 via the first transmission member 21b. In this embodiment, the first transmission member 21b is configured using a belt. The first rotor 210, like the first reference rotor 200A, is configured using a pulley.

[0029] The second transmission member 22b, which is wound around the second reference rotor 200B on the reference axis As, is wound around the second rotor 220 on the symmetric axis At. As a result, the driving force input to the reference shaft 20 is transmitted to the second rotor 220 via the second transmission member 22b. In this embodiment, the second transmission member 22b is configured using a belt. The second rotor 220, like the second reference rotor 200B, is configured using a pulley.

[0030] The first rotating body 210 and the second rotating body 220 are arranged on a symmetric axis At so as to be aligned in the axial direction L. In this example, the first rotating body 210 and the second rotating body 220 are arranged with a gap in between in the axial direction L. The first rotating body 210 and the second rotating body 220 are attached to different shafts. That is, the first rotating body 210 is attached to the first symmetric axis 21, while the second rotating body 220 is attached to the second symmetric axis 22.

[0031] The first rotating body 210 is disposed on a first axial side L1 relative to the second rotating body 220. The second rotating body 220 is disposed on a second axial side L2 relative to the first rotating body 210. In other words, the above-mentioned "first axial side L1" can be rephrased as the side on which the first rotating body 210 is disposed relative to the second rotating body 220 in the axial direction L. The "second axial side L2" can be rephrased as the opposite side, i.e., the side on which the second rotating body 220 is disposed relative to the first rotating body 210 in the axial direction L.

[0032] In this embodiment, the driving force input to the first rotating body 210 via the first transmission member 21b is transmitted through the first symmetrical shaft 21. The driving force input to the second rotating body 220 via the second transmission member 22b is transmitted through the second symmetrical shaft 22.

[0033] In this embodiment, the first output rotor 11r is coupled to the first symmetrical shaft 21 so as to rotate in conjunction with the first symmetrical shaft 21. The driving force input from the first rotor 210 to the first symmetrical shaft 21 is transmitted to the first output rotor 11r and output to lift and lower the lifted body R1 (see FIG. 1). The first output rotor 11r may rotate integrally with the first symmetrical shaft 21 or may rotate synchronously with the first symmetrical shaft 21 at a fixed speed change ratio.

[0034] In this embodiment, the second output rotor 12r is coupled to the second symmetrical shaft 22 so as to rotate in conjunction with the second symmetrical shaft 22. The driving force input from the second rotor 220 to the second symmetrical shaft 22 is transmitted to the second output rotor 12r and output to raise and lower the lifted body R1 (see FIG. 1). The second output rotor 12r may rotate integrally with the second symmetrical shaft 22 or may rotate synchronously with the second symmetrical shaft 22 at a fixed gear ratio.

[0035] In this embodiment, a transmission path for the driving force generated from the driving source M is formed so that it passes through the reference axis 20, the first transmission member 21b, the second transmission member 22b, the first target axis 21, and the second target axis 22 in this order.

[0036] The first symmetrical axis 21 and the second symmetrical axis 22 are disposed with a gap in the axial direction L. A shaft coupling 23 disposed in this gap indirectly connects the first symmetrical axis 21 and the second symmetrical axis 22. To explain further, the shaft coupling 23 is connected to the first rotating body 210 and the second rotating body 220. In other words, the shaft coupling 23 connects the first rotating body 210 attached to the first symmetrical axis 21 and the second rotating body 220 attached to the second symmetrical axis 22. As a result, the first symmetrical axis 21 and the second symmetrical axis 22 are indirectly connected to each other.

[0037] In this way, by fixing the first rotating body 210 and the second rotating body 220 together rather than directly fixing the first symmetrical axis 21 and the second symmetrical axis 22 together, the shafts can be indirectly fixed at a position away from the center of the shaft (a position away from the radial outside). This makes it easier to increase the rigidity against deflection of the shaft.

[0038] The shaft joint 23 is configured using a coupling that has a function of allowing for eccentricity and tilt between the first symmetrical shaft 21 and the second symmetrical shaft 22. However, it is not necessary for it to have such a function.

[0039] The connection structure between the first symmetric shaft 21 and the second symmetric shaft 22 will be described in detail with reference to Figure 3 and subsequent figures. Note that Figure 3 shows a state in which the first symmetric shaft 21 and the second symmetric shaft 22 are connected (hereinafter simply referred to as the "shaft connection state"). Figure 4 shows the first rotating body 210 and the second rotating body 220 in the shaft connection state with imaginary lines. Figures 5 to 7 show the flow of work for removing the first transmission member 21b from the drive transmission device 2.

[0040] 3 and 4, in the shaft coupled state, a portion of the first axial side L1 of the shaft coupling 23 is disposed inside the first rotor 210. In addition, in the shaft coupled state, a portion of the second axial side L2 of the shaft coupling 23 is disposed inside the second rotor 220.

[0041] In this embodiment, a first recess 210a is formed on a side surface 210Si (hereinafter referred to as the "first inner side surface 210Si") on the second axial side L2 of the first rotor 210, recessed toward the first axial side L1. A second recess 220a is formed on a side surface 220Si (hereinafter referred to as the "second inner side surface 220Si") on the first axial side L1 of the second rotor 220, recessed toward the second axial side L2. The shaft coupling 23 is configured to fit into both the first recess 210a and the second recess 220a. As a result, in this embodiment, a portion of the shaft coupling 23 is disposed inside the first rotor 210 and the second rotor 220 in the shaft-coupled state. This configuration also makes it easy to position the shaft coupling 23 in the radial direction relative to the first rotor 210 and the second rotor 220. Note that the "radial direction" refers to a direction perpendicular to the axial direction L.

[0042] With the above configuration, the portion of the coupling 23 that is exposed from the first rotor 210 and the second rotor 220 can be reduced, making it easier to bring the first rotor 210 and the second rotor 220 closer to each other in the axial direction L. As a result, as shown in FIG. 2 , the first reference rotor 200A corresponding to the first rotor 210 and the second reference rotor 200B corresponding to the second rotor 220 can be brought closer to each other in the axial direction L. As a result, of the first reference rotor 200A and the second reference rotor 200B, the one that is arranged farther from the driving source M (in this example, the first reference rotor 200A) can be brought closer to the driving source M as much as possible. Therefore, even if the first reference rotating body 200A and the second reference rotating body 200B are pulled toward the side where the first rotating body 210 and the second rotating body 220 are arranged (the side of the symmetric axis At), the deflection of the reference axis 20 to which the first reference rotating body 200A and the second reference rotating body 200B are attached can be suppressed.

[0043] As shown in FIGS. 3 and 4 , the first rotating body 210 is fixed to the first symmetrical shaft 21 by a first fixing mechanism 21f. In this embodiment, the first fixing mechanism 21f is configured to fix the first rotating body 210 to the first symmetrical shaft 21 from the radially inner side. The first fixing mechanism 21f has a radially disposed portion 21fa disposed radially between the first symmetrical shaft 21 and the first rotating body 210. The radially disposed portion 21fa is configured to be able to freely expand and contract in diameter. When the radially disposed portion 21fa expands in diameter, the first symmetrical shaft 21 and the first rotating body 210 are radially compressed and fixed to each other. When the radially disposed portion 21fa contracts in diameter, the fixation between the first symmetrical shaft 21 and the first rotating body 210 is released. When the first rotating body 210 is released from fixation by the first fixing mechanism 21f, it is able to move in the axial direction L along the first symmetrical shaft 21 (see FIG. 6 ).

[0044] In this example, the first fixing mechanism 21f is configured using a friction-type fastener, such as a wedge-type fastener that changes the difference in diameter between the inner and outer circumferential surfaces that contact the fastening object by inserting a bolt, or a hydraulic-type fastener that changes the difference in diameter using hydraulic pressure.

[0045] As described above, the shaft coupling 23 is configured to fit into the first recess 210a of the first rotating body 210. Furthermore, in this embodiment, the shaft coupling 23 and the first rotating body 210 are fastened together by fasteners B (e.g., bolts). A plurality of fasteners B are inserted into the first rotating body 210 from the side surface 210So on the first axial side L1 of the first rotating body 210 (hereinafter referred to as the "first outer surface 210So"), and each fastener B fastens the first rotating body 210 to the shaft coupling 23. Each fastener B is threaded into a portion of the shaft coupling 23 that fits into the first recess 210a. Thus, in this embodiment, the first rotating body 210 fits into the shaft coupling 23 at the first inner surface 210Si, and is fastened to the shaft coupling 23 by the plurality of fasteners B inserted from the first outer surface 210So. Moreover, each fastener B is inserted into the first rotor 210 from the first axial side L1, radially outward of the first symmetric axis 21.

[0046] The second rotating body 220 is fixed to the second symmetrical axis 22 by a second fixing mechanism 22f. In this embodiment, the second fixing mechanism 22f is configured to fix the second rotating body 220 to the second symmetrical axis 22 from the radially inner side. The second fixing mechanism 22f has a radially disposed portion 22fa disposed radially between the second symmetrical axis 22 and the second rotating body 220. The radially disposed portion 22fa is configured to be able to freely expand and contract in diameter. When the radially disposed portion 22fa expands in diameter, the second symmetrical axis 22 and the second rotating body 220 are radially compressed and fixed to each other. When the radially disposed portion 22fa contracts in diameter, the fixation between the second symmetrical axis 22 and the second rotating body 220 is released. When the second rotating body 220 is released from fixation by the second fixing mechanism 22f, it is able to move in the axial direction L along the second symmetrical axis 22 (see FIG. 6).

[0047] In this example, the second fixing mechanism 22f is configured using a friction type fastener, which may be a wedge type that adjusts the diameter by inserting a bolt, or a hydraulic type that adjusts the diameter by hydraulic pressure.

[0048] As described above, the shaft coupling 23 is configured to fit into the second recess 220a of the second rotating body 220. Furthermore, in this embodiment, the shaft coupling 23 and the second rotating body 220 are fastened together by fasteners B (e.g., bolts). A plurality of fasteners B are inserted into the second rotating body 220 from the side surface 220So (hereinafter referred to as the "second outer side surface 220So") on the second axial side L2 of the second rotating body 220, and each fastener B fastens the second rotating body 220 to the shaft coupling 23. Each fastener B is threaded into a portion of the shaft coupling 23 that fits into the second recess 220a. In this way, in this embodiment, the second rotating body 220 fits into the shaft coupling 23 at the second inner side surface 220Si, and is fastened to the shaft coupling 23 by the plurality of fasteners B inserted from the second outer side surface 220So. Moreover, each fastener B is inserted into the second rotor 220 from the second axial side L2, radially outward of the second symmetric axis 22.

[0049] The first symmetrical shaft 21 and the second symmetrical shaft 22 have the coupling structure described above. As described above, the first symmetrical shaft 21 and the second symmetrical shaft 22 are disposed with a gap in the axial direction L, but in the coupled shaft state, the gap is filled by the shaft coupling 23. Therefore, when the coupled shaft state is released and the shaft coupling 23 is removed, the gap between the two shafts becomes visible. This gap is used when removing the first transmission member 21b or the second transmission member 22b, which are consumables, from the drive transmission device 2. Therefore, this gap is formed to be larger than the width of each of the first transmission member 21b and the second transmission member 22b.

[0050] 5 to 7 show the flow of the work of removing the first transmission member 21b from the drive transmission device 2. The removal of the first transmission member 21b will be described below.

[0051] 5, first fixing mechanism 21f is first reduced in diameter to release first symmetric axis 21 from first rotating body 210. Then, multiple fasteners B are removed from first rotating body 210. Fixation by second fixing mechanism 22f is also released, and multiple fasteners B are removed from second rotating body 220. In this state, first rotating body 210 and second rotating body 220 are connected only by fitting with coupling 23.

[0052] 6, the first rotating body 210 and the coupling 23 are disengaged from each other, and the first rotating body 210 is moved along the first symmetrical axis 21 toward the first axial side L1. Similarly, the second rotating body 220 and the coupling 23 are disengaged from each other, and the second rotating body 220 is moved along the second symmetrical axis 22 toward the second axial side L2. Then, the coupling 23, which has been disengaged from both the first rotating body 210 and the second rotating body 220, is removed. This exposes a gap between the first symmetrical axis 21 and the second symmetrical axis 22 in the axial direction L.

[0053] As shown in Fig. 7, the first transmission member 21b is removed from the first rotating body 210. Because the first transmission member 21b is tensioned by a tensioner (not shown) when attached to the first rotating body 210, the tension of the first transmission member 21b by the tensioner is released before removing the first transmission member 21b from the first rotating body 210. After removing the first transmission member 21b from the first rotating body 210, the first transmission member 21b is passed through the gap between the first symmetrical shaft 21 and the second symmetrical shaft 22 and removed from the drive transmission device 2. This allows the first transmission member 21b to be repaired or replaced.

[0054] Although an example of removing the first transmission member 21b from the drive transmission device 2 has been described above, the same procedure as above can also be carried out when removing the second transmission member 22b from the drive transmission device 2.

[0055] Other Embodiments Next, other embodiments will be described.

[0056] (1) In the above embodiment, an example has been described in which the reference axis 20 is a drive axis connected to the drive source M, and the first and second symmetrical axes 21 and 22 are driven axes that are driven by the rotation of the reference axis 20. However, without being limited to such an example, the reference axis 20 may be a driven axis, and the first and second symmetrical axes 21 and 22 may be drive axes. In other words, the drive source M may be connected to the first symmetrical axis 21 or the second symmetrical axis 22.

[0057] (2) In the above embodiment, an example has been described in which first rotating body 210 is detachably fixed to first symmetrical axis 21 by first fixing mechanism 21f, and second rotating body 220 is detachably fixed to second symmetrical axis 22 by second fixing mechanism 22f. However, without being limited to such an example, first rotating body 210 may be configured integrally with first symmetrical axis 21 (configured so as not to be detachable). Alternatively, second rotating body 220 may be configured integrally with second symmetrical axis 22 (configured so as not to be detachable).

[0058] (3) In the above embodiment, an example has been described in which the first transmission member 21b is configured using a belt, and the first rotating body 210 and the first reference rotating body 200A are configured using pulleys. However, without being limited to such an example, the first transmission member 21b may be configured using a chain, and the first rotating body 210 and the first reference rotating body 200A may be configured using sprockets.

[0059] (4) In the above embodiment, an example has been described in which the second transmission member 22b is configured using a belt, and the second rotating body 220 and the second reference rotating body 200B are configured using pulleys. However, without being limited to this example, the second transmission member 22b may be configured using a chain, and the second rotating body 220 and the second reference rotating body 200B may be configured using sprockets.

[0060] (5) In the above embodiment, an example has been described in which the first rotating body 210 and the second rotating body 220 are arranged with a gap in the axial direction L. However, without being limited to this example, the first rotating body 210 and the second rotating body 220 may be arranged so as to be in contact with each other in the axial direction L.

[0061] (6) In the above embodiment, an example has been described in which the shaft coupling 23 is connected to both the first rotating body 210 and the second rotating body 220, but is not connected to the first symmetrical axis 21 and the second symmetrical axis 22. However, without being limited to this example, the shaft coupling 23 may also be connected to the first symmetrical axis 21 and the second symmetrical axis 22.

[0062] (7) In the above embodiment, the first wound member 11b and the second wound member 12b are configured using belts. However, the present invention is not limited to this example, and at least one of the first wound member 11b and the second wound member 12b may be configured using a wire or a chain.

[0063] (8) In the above embodiment, an example has been described in which the drive transmission device 2 is applied to the lifting device 100. However, without being limited to such an example, the drive transmission device 2 may be applied to various drive devices such as a conveyor or a transfer device.

[0064] (9) In the above embodiment, an example has been described in which the lifting device 100 is configured as a lifter that raises and lowers the transport vehicle V via the lifted object R1. However, without being limited to such an example, the lifting device 100 may be configured as, for example, a lifter mounted on a stacker crane, or as a lifter for raising and lowering an article W in an automated warehouse.

[0065] (10) The configurations disclosed in the above-described embodiments may be combined with configurations disclosed in other embodiments as long as no contradictions arise. Regarding other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications may be made as appropriate within the scope of the present disclosure.

[0066] [Summary of this embodiment] The summary of this embodiment will be described below.

[0067] a reference axis disposed on the reference axis center; a first symmetric axis and a second symmetric axis arranged on a symmetric axis that is another axis parallel to the reference axis; a first reference rotor and a second reference rotor attached to the reference shaft; a first rotating body attached to the first symmetrical axis; a second rotating body attached to the second symmetrical axis; an endless first transmission member wound around the first reference rotor and the first rotor; an endless second transmission member wound around the second reference rotor and the second rotor; a shaft coupling for connecting the first symmetric shaft and the second symmetric shaft; Equipped with A direction parallel to the reference axis and the target axis is defined as an axial direction, The first symmetrical axis and the second symmetrical axis are arranged with a gap in the axial direction, the first rotating body and the second rotating body are arranged on the symmetrical axis so as to be aligned in the axial direction, The shaft coupling is connected to the first rotating body and the second rotating body.

[0068] According to this configuration, the first symmetrical shaft and the second symmetrical shaft are arranged with a gap in the axial direction. By removing the shaft coupling and forming a gap between the first rotating body and the second rotating body, when replacing the first transmission member or the second transmission member, the first transmission member removed from the first rotating body or the second transmission member removed from the second rotating body can be easily removed through the gap between the first symmetrical shaft and the second symmetrical shaft. Furthermore, according to this configuration, the first symmetrical shaft and the second symmetrical shaft can be indirectly connected by connecting the first rotating body and the second rotating body with a shaft coupling, rather than directly connecting the first symmetrical shaft and the second symmetrical shaft. Therefore, the shaft coupling that functions to connect the first symmetrical shaft and the second symmetrical shaft can be less restricted by the size and shape of the first symmetrical shaft and the second symmetrical shaft. Therefore, according to this configuration, the first symmetrical shaft and the second symmetrical shaft, which are arranged on the same axis and have a gap for inserting the first transmission member or the second transmission member, can be connected with a high degree of freedom.

[0069] The side where the first rotor is disposed relative to the second rotor in the axial direction is defined as an axial first side, and the opposite side is defined as an axial second side, a first recess formed on a side surface of the first rotor on the second axial direction side so as to be recessed toward the first axial direction side; a second recess formed on a side surface of the second rotor on the first axial direction side so as to be recessed toward the second axial direction side; Preferably, the shaft coupling is configured to fit into both the first recess and the second recess.

[0070] In this configuration, the shaft coupling fits into both the first recess and the second recess, which makes it easy to increase the rigidity of the coupling between the first and second symmetric shafts by the shaft coupling. Also, the first recess and the second recess make it easy to position the shaft coupling, which makes it easy to improve the workability of connecting the shaft coupling to the first rotating body and the second rotating body.

[0071] the first rotating body is fixed to the first symmetrical axis by a first fixing mechanism, the second rotating body is fixed to the second symmetrical axis by a second fixing mechanism, the first rotating body is movable in the axial direction along the first symmetric axis when the first rotating body is released from the fixation by the first fixing mechanism, Preferably, the second rotating body is movable in the axial direction along the second symmetric axis when released from the fixation by the second fixing mechanism.

[0072] This configuration makes it easier to attach and detach the shaft couplings to the first rotating body and the second rotating body, and ultimately makes it easier to attach and detach the first transmission member wrapped around the first rotating body and the second transmission member wrapped around the second rotating body.

[0073] An elevator device including the drive transmission device, A driving source; a lifting mechanism driven by the drive source; a lifted body that is lifted and lowered by the lifting mechanism; Equipped with the lifting mechanism includes a first output rotor, a second output rotor, a first wound member wound around the first output rotor so as to be freely wound up and unwound, and a second wound member wound around the second output rotor so as to be freely wound up and unwound, The first wound member and the second wound member are connected to the lifted body at different positions, the first output rotor is coupled to the first symmetric shaft so as to rotate in conjunction with the first symmetric shaft; The second output rotor is connected to the second symmetric shaft so as to rotate in conjunction with the second symmetric shaft.

[0074] According to this configuration, the lifted body can be raised and lowered by rotatably driving the first output rotor and the second output rotor with the drive source while the lifted body is stably suspended by the multiple wound members. Furthermore, according to this configuration, the driving force of the drive source can be appropriately transmitted to the first and second shafts, and even if either the first or second transmission member breaks or comes off, the driving force of the drive source can be transmitted to both the first and second shafts via the remaining transmission member. Therefore, according to this configuration, the driving force of the drive source can be appropriately transmitted to the lifted body, ensuring reliable lifting and lowering of the lifted body. [Industrial Applicability]

[0075] The technology disclosed herein can be used in a drive transmission device and an elevator device equipped with the drive transmission device. [Explanation of symbols]

[0076] 100: Lifting device 1: Lifting mechanism 11b: First wound member 11r: First output rotor 12b: Second wound member 12r: Second output rotor 2: Drive transmission device 20:Reference axis 21: First axis of symmetry 21b: First transmission member 21f: 1st fixing mechanism 22: Second axis of symmetry 22b: Second transmission member 22f:Second fixing mechanism 23: Shaft coupling 200A: First reference rotor 200B: Second reference rotor 210: First rotating body 210Si: Side 210So: Side 210a: First recess 220: Second rotating body 220Si: Side 220So: Side 20a: 2nd concave part M: driving source R1: The object being lifted As: Reference axis At: target axis L: Axis direction L1: 1st side in the axial direction L2: Second side in the axial direction

Claims

1. a reference axis disposed on the reference axis center; a first symmetric axis and a second symmetric axis arranged on a symmetric axis that is another axis parallel to the reference axis; a first reference rotor and a second reference rotor attached to the reference shaft; a first rotating body attached to the first symmetrical axis; a second rotating body attached to the second axis of symmetry; an endless first transmission member wound around the first reference rotor and the first rotor; an endless second transmission member wound around the second reference rotor and the second rotor; a shaft coupling for connecting the first symmetric shaft and the second symmetric shaft; Equipped with A direction parallel to the reference axis and the target axis is defined as an axial direction, The first symmetric axis and the second symmetric axis are arranged with a gap in the axial direction, the first rotating body and the second rotating body are arranged on the symmetrical axis so as to be aligned in the axial direction, The shaft coupling is connected to the first rotating body and the second rotating body.

2. A side where the first rotor is disposed with respect to the second rotor in the axial direction is defined as an axial first side, and an opposite side thereto is defined as an axial second side, a first recess formed on a side surface of the first rotor on the second axial direction side so as to be recessed toward the first axial direction side; a second recess formed on a side surface of the second rotor on the first axial direction side so as to be recessed toward the second axial direction side; The drive transmission device according to claim 1 , wherein the shaft coupling is configured to fit into both the first recess and the second recess.

3. the first rotating body is fixed to the first symmetrical axis by a first fixing mechanism, the second rotating body is fixed to the second symmetric axis by a second fixing mechanism, the first rotating body is movable in the axial direction along the first symmetric axis in a state where the first rotating body is released from the fixation by the first fixing mechanism, The drive transmission device according to claim 1 or 2, wherein the second rotating body is movable in the axial direction along the second symmetric axis when the second rotating body is released from the second fixing mechanism.

4. A lifting device comprising the drive transmission device according to claim 1 or 2, A driving source; a lifting mechanism driven by the drive source; a lifted body that is lifted and lowered by the lifting mechanism; Equipped with the lifting mechanism includes a first output rotor, a second output rotor, a first wound member wound around the first output rotor so as to be freely wound up and unwound, and a second wound member wound around the second output rotor so as to be freely wound up and unwound, The first and second winding members are connected to the lifted body at different positions, the first output rotor is coupled to the first symmetric shaft so as to rotate in conjunction with the first symmetric shaft; The second output rotor is coupled to the second symmetric shaft so as to rotate in conjunction with the second symmetric shaft.

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