Wire driving device and object moving device provided with the same

Abstract

To provide a wire driving device 1 that is thin and improves the freedom of layout.SOLUTION: A wire driving device 1 has a worm wheel 5 which has an outer gear portion 52 on a peripheral surface and which rotates by the rotational driving force applied to the outer gear portion 52, and a drum 3 which has a rotation axis O coincident with a rotation axis O of the worm wheel 5, is connected to the worm wheel 5 so as to rotate together with the worm wheel 5 and has a wire wound around a peripheral surface. A concave accommodating portion 53 is formed on the inner peripheral side of the opposing surface of the worm wheel 5 which faces the drum 3, and the entire opposing surface of the drum 3 which is opposed to the worm wheel 5 is accommodated in the accommodating portion 53.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a wire driving device and an object moving device including the same. [Background technology]

[0002] Regarding a technology for driving a driven object connected to the tip side of a wire by unwinding and rewinding the wire, Patent Document 1 discloses a technology in which a fitting part provided on a drum is fitted into a fitting hole of a worm wheel to transmit the rotational force of the worm wheel to the drum. Specifically, the technology discloses a drive mechanism in which a reduction mechanism consisting of a worm and a worm wheel and a drum coaxially connected to the worm wheel are housed in the same housing, a closed cable having one end fixed to the drum and the other end connected to a carrier plate via a reversing pulley, an open cable having one end fixed to the drum and the other end directly connected to the carrier plate, and an electric motor having an armature mechanically connected to the worm and connectable to the drive mechanism.

[0003] As a result, according to the technology of Patent Document 1, the reduction mechanism consisting of a worm and a worm wheel, and the drum coaxially connected to the worm wheel are accommodated in the same housing, thereby realizing a thinner drive mechanism which improves the freedom of layout. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP2009-041310A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in order to improve the degree of freedom in the layout of the mounting target of the drive mechanism, there is a need to further reduce the thickness of the device, in addition to the technology disclosed in Patent Document 1. In particular, when the drive mechanism is used in a window regulator that raises and lowers the window glass of a vehicle, there is a demand for a thinner device because of the recent restrictions on the mounting space for the window regulator inside the vehicle door.

[0006] An object of the present invention is to provide a wire-driven device that has been made thinner to improve the freedom of layout, and an object movement device including the same. [Means for solving the problem]

[0007] A wire driving device according to one aspect of the present invention drives a driven object connected to a tip end side of the wire by winding and unwinding a wire, A worm wheel having a gear portion on a peripheral surface thereof and rotated by a rotational driving force applied to the gear portion; a drum having a rotation axis that coincides with the rotation axis of the worm wheel, connected to the worm wheel so as to rotate together with the worm wheel, and the wire wound around a circumferential surface of the drum; a recessed housing portion is formed on an inner peripheral side of a surface of the worm wheel that faces the drum, The entire surface of the drum that faces the worm wheel is housed in the housing portion. Effect of the Invention

[0008] According to the present invention, it is possible to provide a wire drive device that has been made thinner to improve the freedom of layout, and an object movement device including the same. [Brief description of the drawings]

[0009] [Figure 1] 1 is an example of an overall perspective view of an object moving device; [Diagram 2] FIG. 2 is an example of a cross-sectional view of the wire driving device taken along line AA. [Diagram 3] FIG. 2 is an example of an exploded perspective view of a wire driving device. [Figure 4] 5 is an explanatory diagram showing an example of an engagement state between a drum housing and a wheel housing. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this specification, the expressions "upper surface," "upper direction," "lower surface," "lower direction," and "vertical direction" are used, and the drum housing 2 (see FIG. 3 described later) side is defined as the upper side and the wheel housing 6 (see FIG. 3 described later) side is defined as the lower side along the rotation axis O (see FIG. 2 to FIG. 4 described later) of the drum 3 described later. Note that the above definitions of up and down are merely defined for the convenience of explanation.

[0011] (Object moving device 100) As shown in Fig. 1, the object moving device 100 includes a wire driving device 1 that unwinds and winds wires 81, 82, a moving member 104 to which one ends of the two wires 81 are connected, a guide rail 105 that guides the moving member 104, and a direction changing member 106 provided at an end of the guide rail 105. As shown in Fig. 2, the wire driving device 1 in the object moving device 100 is configured so that part of the thickness of the drum 3 and part of the thickness of the worm wheel 5 overlap in the direction parallel to the rotation axis O (the up-down direction in Fig. 2), thereby realizing a thin structure. The configuration that realizes the thin structure will be described later.

[0012] The object moving device 100 moves the moving member 104 via the wires 81 and 82, and operates the driven object by moving the moving member 104. The driven object operated by the object moving device 100 is not particularly limited as long as it is operated by the movement of the moving member 104. The driven object may be the moving member 104 itself, or may be operated directly or indirectly by the movement of the moving member 104. When the object moving device 100 is a window regulator, the driven object is, for example, a window glass of a vehicle. In addition, the driven object may be a sunroof, trunk door, hatchback, curtain, sliding door, etc. of a vehicle. Note that the application of the driven object is not limited to a vehicle, and may be applied to a ship, a house, or various equipment.

[0013] 1 shows a case where the object moving device 100 is, for example, a window regulator that raises and lowers a window glass (not shown) of a vehicle. In the object moving device 100, a window glass is attached to a moving member 104, and the window glass attached to the moving member 104 is raised and lowered by driving wires 81 and 82.

[0014] (Wire drive device 1) 2, the wire driving device 1 has a drum housing 2, a drum 3, a waterproof cover 4, a worm wheel 5, and a wheel housing 6. The drum housing 2 and the wheel housing 6 are fastened together to form a housing having an internal space, and the drum 3, the waterproof cover 4, and the worm wheel 5 are housed in the internal space.

[0015] (Wheel housing 6) As shown in Fig. 3, the wheel housing 6 has a cylindrical container 61 with an open top. A motor mounting portion 611 on which a drive motor (not shown) is mounted and a gear exposure portion 612 on which a worm gear provided on a rotary drive shaft of the drive motor is exposed to the internal space are formed on a side wall 61A of the container 61. An attachment portion 613 is disposed at one location on the side wall 61A of the container 61, and engagement portions 614, 614 are disposed at two locations. A fastening member 7 for fastening the drum housing 2 and the wheel housing 6 is attached to the attachment portion 613. The engagement portions 614, 614 are engaged with the engagement claw portions 213, 213 of the drum housing 2 by the wheel housing 6 and the drum housing 2 being rotated relatively around the rotation axis O as the center of rotation.

[0016] Furthermore, the side wall 61A of the housing 61 has an upper edge portion 615 which is an upper region including the upper end, and a side portion 616 which is a lower region from the upper edge portion 615 to the lower end. The upper edge portion 615 is formed with a larger diameter than the side portion 616. Between the upper edge portion 615 and the side portion 616, an extension portion 617 is formed which extends from the upper end of the side portion 616 to the lower end of the upper edge portion 615 in the outer circumferential direction. The extension portion 617 and the upper edge portion 615 are adapted to abut the periphery of the waterproof cover 4 in an airtight state. In addition, the upper edge portion 615 of the housing 61 has cover engagement portions 618, 618 which enable engagement with the waterproof cover 4 in the vertical direction and the rotational direction. The cover engagement portions 618, 618 are arranged symmetrically around the rotation axis O.

[0017] Furthermore, the upper edge portion 615 of the housing body 61 has a step portion 6151 in which the length (height) in the vertical direction of a part of the area is set longer (higher) than the other area. When the outer peripheral packing member 41 of the waterproof cover 4 is in close contact with the upper edge portion 615, the step portion 6151 of the housing body 61 acts as an interference body in the rotation direction centered on the rotation axis O of the worm wheel 5 and the drum 3, and prevents the waterproof cover 4 from rotating together with the worm wheel 5 and the drum 3 when the worm wheel 5 and the drum 3 rotate. In addition, a convex portion 62 is disposed in the center of the wheel housing 6. The convex portion 62 is molded integrally with the wheel housing 6 in order to reduce the number of parts. The convex portion 62 is formed in a cylindrical shape protruding upward from the upper surface of the bottom wall 61B of the wheel housing 6, and the central axis is aligned with the rotation axis O. The upper surface of the convex portion 62 is set to be located between the upper end of the extension portion 617 and the upper end of the upper edge portion 615.

[0018] (Worm Wheel 5) A worm wheel 5 is rotatably provided in the wheel housing 6. In this embodiment, the worm wheel 5 is a two-stage gear, and has an inner gear portion 51 and an outer gear portion 52. The inner gear portion 51 is provided on the upper side of the worm wheel 5. The inner gear portion 51 is formed in a cylindrical shape, and the central axis of the inner gear portion 51 coincides with the rotation axis O. An annular support portion 54 having a central axis coinciding with the rotation axis O is formed on the upper surface of the inner gear portion 51.

[0019] A gear having a vertical gear groove is formed on the outer peripheral surface of the upper region of the inner gear portion 51. The inner gear portion 51 is formed such that its upper region is located above the upper end of the convex portion 62 of the wheel housing 6, and its lower region is located in a region extending from the upper end to the lower end of the convex portion 62 of the wheel housing 6. A fitting hole 511 with an open lower surface is formed inside the inner gear portion 51. The central axis of the fitting hole 511 coincides with the rotation axis O. The fitting hole 511 is rotatably fitted into the convex portion 62 of the wheel housing 6.

[0020] An outer circumferential gear portion 52 is disposed below the worm wheel 5. The outer circumferential gear portion 52 is disposed at a vertical position corresponding to a lower region of the inner circumferential gear portion 51, and is disposed radially outward of the inner circumferential gear portion 51. The outer circumferential gear portion 52 is formed in a circular shape when viewed from above, and the central axis of the outer circumferential gear portion 52 coincides with the rotation axis O. A gear having a gear groove inclined in the vertical direction is formed on the outer circumferential surface of the outer circumferential gear portion 52. The gear of the outer circumferential gear portion 52 is engaged with a worm gear (not shown) exposed from a gear exposure portion 612 of the wheel housing 6. As a result, the worm wheel 5 is rotatable in the forward and reverse directions around the rotation axis O as a rotation center by transmitting a rotational driving force of a drive motor (not shown) to the outer circumferential gear portion 52.

[0021] A concave accommodation portion 53 with an open upper surface is formed between the inner circumference side gear portion 51 and the outer circumference side gear portion 52. Specifically, in the radial direction of the rotation axis O, a downwardly concave accommodation portion is provided in an annular shape between the lower end region of the inner circumference side gear portion 51 and the gear of the outer circumference side gear portion 52. The accommodation portion 53 is configured so that the entire lower surface portion of the waterproof cover 4 and the entire lower surface portion of the drum 3 overlap with the worm wheel 5 in a part in the up-down direction.

[0022] (Waterproof cover 4) A waterproof cover 4 is provided on the upper surface of the worm wheel 5. The waterproof cover 4 is disposed between the worm wheel 5 and the drum 3, and its peripheral portion is sandwiched between the wheel housing 6 and the drum housing 2, and is configured to divide the space on the wheel housing 6 side and the space on the drum housing 2 side into a liquid-tight state. As a result, even if water droplets or moisture enter from the outside when the drum 3 rewinds or unwinds the wires 81, 82, the waterproof cover 4 divides the space on the wheel housing 6 side and the space on the drum housing 2 side into a liquid-tight state, so that the water droplets or moisture are prevented from moving from the space on the wheel housing 6 side to the space on the drum housing 2 side, and it is possible to protect the device that applies a rotational driving force to the worm wheel 5 from moisture and moisture.

[0023] Specifically, the waterproof cover 4 has an outer circumferential packing member 41 formed to be in close contact with the upper edge portion 615 and the step portion 6151 of the wheel housing 6, an inner circumferential packing member 42 formed to be in close contact with the lower region of the inner circumferential gear portion 51 of the worm wheel 5, and a packing support member 43 that supports the outer circumferential packing member 41 and the inner circumferential packing member 42 at the outer circumferential portion and the inner circumferential portion and is separated from the worm wheel 5. The packing support member 43 is formed to have a vertical cross-sectional concave shape in which the outer circumferential region is located above the outer circumferential gear portion 52 of the worm wheel 5 and the inner circumferential region is concave downward. That is, the packing support member 43 has an annular recess 44 whose inner circumferential region is surrounded by the outer circumferential region. As a result, the waterproof cover 4 is overlapped in the vertical direction with the worm wheel 5 by the recess 44 of the inner circumferential region being accommodated in the accommodation portion 53 of the worm wheel 5.

[0024] (Drum 3) The drum 3 is disposed above the waterproof cover 4. The drum 3 is formed in a cylindrical shape. The outer diameter of the drum 3 is set to be smaller than the inner peripheral region of the waterproof cover 4. The entire lower part of the drum 3 is accommodated in a recess 44, which is the inner peripheral region of the waterproof cover 4. In this embodiment, at least the region of the lower side of the drum 3 where the wire groove 32 is not provided is accommodated in the recess 44. As a result, the entire lower part of the drum 3 is accommodated in the recess 44 of the waterproof cover 4, and the recess 44 of the waterproof cover 4 is accommodated in the accommodation portion 53 of the worm wheel 5, so that the drum 3 overlaps with the worm wheel 5 in the vertical direction. The wire driving device 1 is made thinner by the reduction in the thickness in the vertical direction due to the overlapping portion between the drum 3, the waterproof cover 4, and the worm wheel 5.

[0025] A fitting hole 31 is formed in the center of the drum 3, penetrating in the vertical direction. In other words, the drum 3 has the fitting hole 31 as a hollow fitting portion with both axial end faces open. The opening diameter of the upper surface of the fitting hole 31 is set to a diameter smaller than the inner circumferential diameter of the inner circumferential surface of the fitting hole 31 that slides against the convex portion 62, and the support portion 54 of the worm wheel 5 is rotatably fitted into the opening of the upper surface. The central axes of the support portion 54 of the worm wheel 5 and the fitting hole 31 are aligned with the rotation axis O. As a result, the support portion 54 of the worm wheel 5 rotatably supports the upper surface of the drum 3.

[0026] Furthermore, an inner peripheral gear portion 51 of a worm wheel 5 disposed below the drum 3 is fitted into the fitting hole 31 of the drum 3. A gear having a vertical gear groove is formed on the inner peripheral surface excluding the upper surface portion of the fitting hole 31. As described above, a gear having a vertical gear groove is also formed on the inner peripheral gear portion 51 of the worm wheel 5. The drum 3 and the worm wheel 5 are allowed to rotate integrally about the rotation axis O by meshing the gear of the fitting hole 31 of the drum 3 with the gear of the inner peripheral gear portion 51 of the worm wheel 5.

[0027] A wire groove 32 is formed on the outer peripheral surface of the drum 3. The wire groove 32 is formed in a spiral shape from the upper part to a predetermined region on the lower part of the outer peripheral surface of the drum 3. Among the regions in which the wire groove 32 is formed, the regions in which the wires 81, 82 are wound in the portions where the wires 81, 82 are not wound or let out are defined as surplus winding portions. As shown in FIG. 2, the upper and lower ends of the wire groove 32 are connected to wire fixing portions 33a, 33b (see FIG. 3) formed on the upper and lower sides of the drum 3, respectively. One end of one wire 81 is fixed to the wire fixing portion 33a on the upper side of the drum 3. Also, one end of the other wire 82 is fixed to the wire fixing portion 33b on the lower side of the drum 3.

[0028] As a result, the wires 81, 82 are wound in opposite directions from the upper and lower sides of the drum 3 and are pulled out from the center of the surplus windings, allowing connection to a drive target (not shown). As a result, when the drum 3 rotates forward, it operates to unwind one wire 81 and wind up the other wire 82, thereby making it possible to move the drive target to one side (for example, in a direction toward the wire driving device 1). On the other hand, when the drum 3 rotates reversely, it operates to wind up one wire 81 and unwind the other wire 82, thereby making it possible to move the drive target to the other side (for example, in a direction away from the wire driving device 1).

[0029] The lower end of the drum 3 is accommodated in a recess 44, which is an inner peripheral region of the waterproof cover 4. As a result, the drum 3 is overlapped in the vertical direction with respect to the worm wheel 5 by having the lower end accommodated in the accommodation portion 53 of the worm wheel 5. In addition, the lower end of the drum 3 is separated from the waterproof cover 4. This prevents the waterproof cover 4 from exerting a frictional force that would hinder the rotation of the drum 3 when the drum 3 rotates. The lower end of the drum 3 accommodated in the recess 44 may be accommodated to a degree that does not hinder the winding of the wires 81, 82 onto the drum 3 or the unwinding of the wires 81, 82 from the drum 3. For example, the recess 44 may accommodate an area of ​​the lower region of the drum 3 where the wire groove 32 is not provided, or an area where the wire groove 32 is not provided and an extra winding portion.

[0030] As described above, the wire driving device 1 includes the worm wheel 5 having the outer circumferential gear portion 52 (gear portion) on its circumferential surface and rotated by the rotational driving force applied to the outer circumferential gear portion 52, and the drum 3 having the fitting hole 31 with a rotation axis O coinciding with the rotation axis O of the worm wheel 5, connected to the worm wheel 5 by meshing of the gears so as to rotate together with the worm wheel 5, and having the wires 81, 82 wound around its circumferential surface. A concave accommodation portion 53 is formed on the inner circumferential side of the facing surface (upper surface) of the worm wheel 5 facing the drum 3, and the entire facing surface (lower surface) of the drum 3 facing the worm wheel 5 is accommodated in the accommodation portion 53. Note that the entire region from the facing surface (lower surface) of the drum 3 facing the worm wheel 5 to the extra winding portion may be accommodated in the accommodation portion 53.

[0031] As a result, the vertical thickness of the drum 3 and the vertical thickness of the worm wheel 5 are the elements of the device thickness in the direction of the rotation axis O of the wire driving device 1, but since the entire surface of the drum 3 facing the worm wheel 5 is accommodated in the accommodation portion 53 of the worm wheel 5, the thickness of the drum 3 and the thickness of the worm wheel 5 are partially overlapped in the direction of the rotation axis O. Therefore, the device thickness in the vertical direction of the wire driving device 1 is the sum of the thickness of the drum 3 and the thickness of the worm wheel 5 minus the thickness of any of the overlapping parts, so that it can be made thinner than when the drum 3 and the worm wheel 5 are simply arranged facing each other with a space between them. As a result, the wire driving device 1 can be made thinner, which improves the freedom of layout. In this embodiment, the structure in which the waterproof cover 4 is used between the drum housing 2 and the wheel housing 6 has been described, but the waterproof cover 4 may not be used. In this case, the lower end of the drum 3 is accommodated in the worm wheel accommodating portion 53, and the area of ​​the lower end of the drum 3 accommodated in the worm wheel accommodating portion 53 can be the same as the area when a waterproof cover is used.

[0032] When the wire driving device 1 is used in a window regulator, the reduction ratio can be increased by increasing the number of teeth of the worm wheel more than usual, and the rotational torque can be increased. This allows the diameter of the drum that rotates integrally with the worm wheel to be larger than usual, and the winding length of the wire groove can be secured. In other words, the number of windings of the wire around the drum can be reduced, and the drum can be made thinner. This allows the wire driving device 1 to be made even thinner.

[0033] (Drum housing 2) The drum 3 is accommodated in a drum housing 2. The drum housing 2 has a cylindrical accommodation body 21 with an open bottom surface. The accommodation body 21 is formed with outlets 215, 216 corresponding to the wires 81, 82 wound around the drum 3, respectively. A cylindrical protrusion 211 (see FIG. 2) protruding downward is formed in the center of the bottom surface of the upper wall 21A of the accommodation body 21. The protrusion 211 is rotatably fitted into an annular hole formed by the annular support portion 54 of the worm wheel 5.

[0034] The side wall 21B of the housing 21 presses the peripheral edge of the waterproof cover 4 and the outer periphery packing member 41 toward the wheel housing 6. The side wall 21B of the housing 21 is formed with an attachment portion 212, engaging claw portions 213, 213, and an attachment hole 214. The attachment portion 212 and the engaging claw portions 213, 213 are arranged corresponding to the attachment portion 613 and the engaging portions 614, 614 of the wheel housing 6. As shown in FIG. 4, the engaging claw portions 213, 213 of the drum housing 2 have a claw support portion 2131 extending in the rotational direction about the rotation axis O as the center of rotation, and a claw portion 2132 formed at the tip of the claw support portion 2131 and protruding in the outer periphery direction of the drum housing 2. On the other hand, the engagement portion 614 of the wheel housing 6 has a claw support portion 6141 formed in the opposite direction to the claw support portion 2121 of the drum housing 2, and a claw portion 6142 formed at the tip of the claw support portion 6141 and protruding in the inner circumferential direction of the drum housing 2. When the drum housing 2 and the wheel housing 6 are joined, the claw portion 2132 of the engagement claw portion 213 and the claw portion 6142 of the engagement portion 614 are arranged so as to be able to come into contact with each other, thereby forming an engagement mechanism in which the drum housing 2 and the wheel housing 6 are engaged by relatively rotating about the rotation axis O. A fixing member such as a bolt (not shown) is attached to the mounting hole 214. The wire driving device 1 is fixed to an attachment target such as a vehicle body by the fixing member.

[0035] (summary) The wire driving device 1 according to one embodiment of the present invention has been described above. The wire driving device 1 of the above-described embodiment mainly includes the following configuration.

[0036] (1) A wire driving device 1 that drives a driven object connected to a tip end side of the wires 81, 82 by winding and unwinding the wires 81, 82, A worm wheel 5 having a gear portion (outer peripheral gear portion 52) on its peripheral surface and rotated by a rotational driving force applied to the gear portion; a drum 3 having a rotation axis O coincident with the rotation axis O of the worm wheel 5, connected to the worm wheel 5 so as to rotate together with the worm wheel 5, and having the wires 81 and 82 wound around its circumferential surface; A concave accommodating portion 53 is formed on the inner peripheral side of the surface of the worm wheel 5 that faces the drum 3, The entire surface of the drum 3 facing the worm wheel 5 is accommodated in the accommodation portion 53. Wire drive device 1.

[0037] According to the wire driving device 1 of (1) above, the drum 3 and the worm wheel 5 are disposed facing each other with their rotation axes aligned, and the drum 3 rotates together with the worm wheel 5, whereby the wires 81, 82 wound around the drum 3 are unwound and rewound, thereby driving a driven object connected to the tip side of the wires 81, 82. In the wire driving device 1 that operates with such a structure, the thickness of the drum 3 and the thickness of the worm wheel 5 are elements of the device thickness in a direction parallel to the rotation axis O, but since the entire facing surface of the drum 3 facing the worm wheel 5 is accommodated in the accommodation portion 53 of the worm wheel 5, a part of the thickness of the drum 3 and the thickness of the worm wheel 5 overlap in the direction parallel to the rotation axis O. Therefore, the device thickness of the wire driving device 1 is the sum of the thickness of the drum 3 and the thickness of the worm wheel 5 minus the thickness of any of the overlapping parts, and therefore the device thickness can be made thinner than when the drum 3 and the worm wheel 5 are simply disposed facing each other with a space between them. As a result, the wire driving device 1 can be made thinner, which improves the freedom of layout.

[0038] (2) a wheel housing 6 that accommodates the worm wheel 5; A drum housing 2 that accommodates the drum 3; a waterproof cover 4 that is disposed between the drum 3 and the worm wheel 5, has a peripheral edge portion sandwiched between the wheel housing 6 and the drum housing 2, and divides a space on the wheel housing 6 side and a space on the drum housing 2 side into a liquid-tight state; The waterproof cover 4 has a recess 44 formed on its inner circumferential side, and the recess is accommodated in the accommodation portion 53 of the worm wheel 5 and accommodates the entire opposing surface of the drum 3. The wire driving device 1 described in (1) above.

[0039] According to the above configuration (2), even if water droplets or moisture enter from the outside when the drum 3 unwinds or unwinds the wires 81, 82, the waterproof cover 4 separates the space on the wheel housing 6 side from the space on the drum housing 2 side in a liquid-tight state, so that the water droplets or moisture can be prevented from moving from the space on the drum housing 2 side to the space on the wheel housing 6 side. Therefore, the device that imparts the rotational driving force to the worm wheel 5 can be protected from water and moisture. Even when the waterproof cover 4 is provided in this manner, a recess is formed on the inner circumferential side of the waterproof cover 4, and this recess is accommodated in the accommodation portion of the worm wheel 5 and accommodates the entire opposing surface of the drum 3, so that a reduction in thickness due to the overlapping portion between the drum 3 and the worm wheel 5 can be realized.

[0040] (3) The worm wheel 5 has a hollow rotating shaft (fitting hole 511) that protrudes from the bottom surface of the wheel housing 6 side to the drum housing 2 side in the center surrounded by the accommodating portion 53 and has an open bottom surface. The drum 3 has a hollow fitting portion (fitting hole 31) with both axial end faces open, and is connected to the worm wheel 5 by fitting the rotating shaft (inner peripheral gear portion 51) into the fitting portion. The drum housing 2 rotatably supports an upper end of the rotation shaft of the worm wheel 5, The wheel housing 6 has a protruding portion 62 integrally molded at the center thereof, which is inserted into the rotation shaft (fitting hole 511) of the worm wheel 5, The worm wheel 5 is rotatably supported by the convex portion 62. The wire driving device 1 according to (1) or (2) above.

[0041] According to the above configuration (3), a mechanism for transmitting the rotational driving force of the worm wheel 5 to the drum 3 can be configured with a small number of parts.

[0042] (4) A wire groove 32 along which the wires 81, 82 are aligned is formed on the outer periphery of the drum 3, and the wire groove 32 has an extra winding portion around which the wires 81, 82 that are not led out to the outside are wound, and at least a part of the extra winding portion in a direction parallel to the rotation axis of the drum 3 is accommodated in the accommodating portion 53 of the worm wheel 5. The wire driving device 1 according to (1) or (2) above.

[0043] According to the above configuration (4), even if the drum 3 is provided with an extra winding portion, the thickness of the wire driving device 1 can be made thin.

[0044] (5) a wheel housing 6 that accommodates the worm wheel 5; A drum housing 2 that accommodates the drum 3, The wheel housing 6 and the drum housing 2 have a mounting portion 613 at one location to which a fastening member 7 is attached, and an engagement mechanism (engagement claw portion 213, engagement portion 614) that engages with the drum housing 2 and the wheel housing 6 by rotating them relatively around the rotation axis O. The wire driving device 1 according to (1) or (2) above.

[0045] According to the above configuration (5), the drum housing 2 and the wheel housing 6 can be easily fastened together by screwing the fastening member 7 into one mounting portion 613 and rotating the drum housing 2 and the wheel housing 6 relative to the rotation axis O to engage the engagement mechanism.

[0046] The wire driving device 1 according to the present invention may be configured with only the configuration described in (1) above, or may be configured by any combination of the configuration described in (1) above and any of the configurations described in (2) to (5) above, within a range in which consistency can be achieved. When the configuration described in (1) above is combined with the configuration described in any of (2) to (5) above, it is also possible to combine all or a part of the configuration described in (1) above with all or a part of the configuration described in one or more of the wire driving devices 1 in (2) to (5) above, within a range in which consistency can be achieved. When all or a part of the configuration described in (1) above is combined with a part of the configuration described in one or more of the wire driving devices 1 in (2) to (5) above, the combination can be made arbitrarily without restrictions, within a range in which consistency can be achieved.

[0047] (6) An object moving device 100 including the wire driving device 1 according to any one of (1) to (5) above.

[0048] According to the above configuration (6), the object moving device 100 that is thinned by the wire driving device 1 can be obtained.

[0049] As described above, within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications and alterations. Therefore, it is understood that such modifications and alterations fall within the scope of the present invention. For example, even if a person skilled in the art appropriately adds, deletes, or modifies the design of the above-mentioned embodiment, or adds, omits, or modifies the conditions of a process, the modifications are also included in the scope of the present invention as long as they include the gist of the present invention. [Explanation of symbols]

[0050] 1 Wire drive unit 2 Drum housing 3 Drums 3 4. Waterproof cover 5 Worm Wheel 6 Wheel housing 7 Fastening members 21 Containment Unit 21A Top wall 21B Side wall 32 Wire Groove 41 Outer periphery packing member 42 Inner circumference packing member 43 Packing support member 44 Storage unit 53 Recess 61 Containment Unit 100 Object moving device 211 Protrusion 212 Mounting part 213 Engagement claw

Claims

1. A wire driving device that drives a driven object connected to a tip side of a wire by winding and unwinding the wire, A worm wheel having a gear portion on a peripheral surface thereof and rotated by a rotational driving force applied to the gear portion; a drum having a rotation axis that coincides with the rotation axis of the worm wheel, connected to the worm wheel so as to rotate together with the worm wheel, and the wire wound around a circumferential surface of the drum; a recessed housing portion is formed on an inner peripheral side of a surface of the worm wheel that faces the drum, The entire surface of the drum facing the worm wheel is accommodated in the accommodation portion. Wire drive device.

2. a wheel housing that accommodates the worm wheel; A drum housing that houses the drum; a waterproof cover that is disposed between the drum and the worm wheel, the peripheral edge of which is sandwiched between the wheel housing and the drum housing, and divides a space on the wheel housing side and a space on the drum housing side into a liquid-tight state; The waterproof cover has a recess formed on an inner circumferential side, and the recess is accommodated in the accommodation portion of the worm wheel and accommodates the entire opposing surface of the drum.

2. The wire drive apparatus of claim 1.

3. The worm wheel has a hollow rotation shaft that is protruded from a bottom surface of the wheel housing side toward the drum housing side and has an open bottom surface at a center surrounded by the accommodation portion, The drum has a hollow fitting portion having open axial end faces, and is connected to the worm wheel by fitting the rotating shaft into the fitting portion, The drum housing rotatably supports an upper end of the rotation shaft of the worm wheel, The wheel housing has a central portion having a protruding portion integrally molded therein, the protruding portion being inserted into the rotation shaft of the worm wheel, The worm wheel is rotatably supported by the convex portion.

3. The wire driving device according to claim 1 or 2.

4. A wire groove is formed on the outer periphery of the drum along which the wire is aligned, and the wire groove has an extra winding portion around which the wire that is not led out to the outside is wound, and at least a part of the extra winding portion in a direction parallel to the rotation axis of the drum is accommodated in the accommodation portion of the worm wheel.

3. The wire driving device according to claim 1 or 2.

5. a wheel housing that accommodates the worm wheel; A drum housing that houses the drum, The wheel housing and the drum housing have a mounting portion at one location to which a fastening member is attached, and an engagement mechanism that engages the drum housing and the wheel housing by relatively rotating the drum housing and the wheel housing about the rotation shaft.

3. The wire driving device according to claim 1 or 2.

6. An object moving device comprising the wire driving device according to claim 1 or 2.

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