JP2020066960A - Drive unit - Google Patents

Abstract

To provide a drive unit that enables implementation of further downsizing and weight saving.SOLUTION: A drive unit includes: a closing side cable for drawing a slide door in a closing direction; and a closing side drum 70 around which the closing side cable is wound, the closing side drum comprising a small diameter part 73 on one side in an axial direction and a large diameter part 74 on the other side in the axial direction. Sizes of winding diameters D2, D3 of the small diameter part 73 are made to be sizes for absorbing a variation (an increment of about 12 mm) in the closing side cable's feed amount from the closing side drum 70 caused via a movement process of the slide door. Thereby, absorption of a variation (an increment of about 12 mm) in the closing side cable's feed amount from the closing side drum 70 caused via the movement process of the slide door is enabled at the small diameter part 73 of the closing side drum 70, which enables disposal of a large tensioner mechanism composed of a plurality of components as before. Accordingly, further downsizing and weight saving of a drive unit is enabled.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a drive unit that drives an opening / closing body that opens and closes an opening.

  The side of a vehicle such as a one-box car is provided with an opening for passengers to get in and out and take in and out luggage. The opening has a relatively large opening and is opened and closed by a sliding door equipped with a roller assembly. Since the sliding door is heavy, a vehicle equipped with the sliding door is equipped with a sliding door opening / closing mechanism that can automatically open and close the sliding door.

  The sliding door opening / closing mechanism includes a drive unit. The drive unit is provided with a closing side cable and an opening side cable for pulling the slide door in the closing direction and the opening direction. The drive unit includes a drum in which a closing side cable and an opening side cable are wound in opposite directions to each other, and the closing side cable or the opening side cable is driven by rotating the drum in a normal direction or a reverse direction, whereby a slide door is driven. Is opened and closed.

  Such a drive unit is described in Patent Document 1, for example. The drive unit described in Patent Document 1 includes an electric motor, a drum rotated by the electric motor, and a pair of tensioner mechanisms that apply a predetermined tension to a pair of cables. The tensioner mechanism absorbs a change in the amount of the cable fed from the drum that occurs during the movement of the slide door, and prevents the cable from slackening.

JP, 2009-299344, A

  However, the drive unit described in Patent Document 1 described above includes a pair of tensioner mechanisms in order to absorb a change in the amount of feeding the cable from the drum. The tensioner mechanism includes a tensioner pulley, a pulley holder that movably supports the tensioner pulley in the cable feeding direction, a guide shaft that guides the movement of the pulley holder, and a spring that applies a predetermined tension to the pulley holder. Therefore, among the components forming the drive unit, the tensioner mechanism is a relatively large component, and it is difficult to further reduce the size and weight of the drive unit.

  An object of the present invention is to provide a drive unit capable of realizing further reduction in size and weight.

  In one aspect of the present invention, a drive unit that drives an opening / closing body that opens and closes an opening, wherein a cable that pulls the opening / closing body and the cable are wound around, and a small-diameter portion and an axial direction are provided on one side in the axial direction. A drum having a large-diameter portion on the side, and the winding diameter of the small-diameter portion is set to a size that absorbs a change in the amount of feeding the cable from the drum that occurs during the movement process of the opening / closing body. Has become.

  In another aspect of the present invention, the cable includes a first cable that pulls the opening / closing body in a closing direction and a second cable that pulls the opening / closing body in an opening direction, and the drum includes the first cable. A first drum around which a cable is wound, and a second drum around which the second cable is wound, the first cable is wound around a small-diameter portion of the first drum, and the second cable is In a state in which the opening / closing body is wound around the small diameter portion of the second drum, the opening / closing body moves between a predetermined position in the opening portion and a position at which the opening portion is fully closed, and the first cable is connected to the first drum. In a state in which the opening / closing member is wound around the large diameter portion of the second drum and the second cable is wound around the large diameter portion of the second drum, the opening / closing body is at a predetermined position in the opening portion and a position where the opening portion is fully opened. Move between and before The winding diameter of the small diameter portion of the first drum from the first drum of the first cable when the opening / closing body moves between a predetermined position in the opening and a position in which the opening is fully closed. It is sized to absorb changes in the amount of paper sent.

  In another aspect of the present invention, the opening / closing body is provided with a moving member that moves along a guide rail that is provided on the vehicle body and has a curved portion that is curved toward the vehicle interior on the front side of the vehicle body. The first cable is connected to one side of the moving direction of the moving member, the second cable is connected to the other side of the moving member of the moving direction, and the winding diameter of the small diameter portion of the first drum is It is sized to absorb a change in the amount of the first cable fed from the first drum when passing through the curved portion.

  In another aspect of the present invention, the winding diameter of the large diameter portion of the first drum and the winding diameter of the large diameter portion of the second drum are the same, and the small diameter of the first drum is small. The winding diameter of the portion is smaller than the winding diameter of the small diameter portion of the second drum.

  According to the present invention, a cable for pulling the opening / closing body and a drum around which the cable is wound and having a small diameter portion on one side in the axial direction and a large diameter portion on the other side in the axial direction are provided. The hanging diameter is large enough to absorb the change in the amount of the cable fed from the drum that occurs during the movement of the opening / closing body.

  As a result, in the small-diameter portion of the drum, it is possible to absorb a change in the amount of feeding of the cable from the drum that occurs during the process of moving the opening / closing body, and it is possible to eliminate the conventional large tensioner mechanism composed of a plurality of parts. It will be possible. Therefore, the drive unit can be made smaller and lighter.

1 is a side view of a vehicle equipped with a drive unit according to the present invention. It is a top view explaining the attachment structure to the vehicle body of a slide door. FIG. 3 is a perspective view (without a gear cover) of the drive unit shown in FIG. FIG. 4 is a sectional view (with a gear cover) taken along the line BB of FIG. 3. FIG. 4 is a sectional view (with a gear cover) taken along the line C-C in FIG. 3. (A), (b) is a perspective view explaining a closing side drum, an opening side drum, and a drive belt. It is a side view explaining the cable groove of a closing side drum. It is a side view explaining the cable groove of an open side drum. (A) is a figure which shows the [fully opened state] in which the open side cable was wound around the open side drum, and (b) is a figure which shows the [fully closed state] in which the closed side cable was wound around the closed side drum. . It is explanatory drawing explaining the change of a cable length. It is a graph explaining change of cable length. It is a graph explaining a door closer function.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a side view of a vehicle equipped with a drive unit according to the present invention, FIG. 2 is a plan view illustrating a mounting structure of a slide door to a vehicle body, and FIG. 3 is a view of the drive unit of FIG. 3 is a perspective view (without gear cover), FIG. 4 is a sectional view taken along the line BB of FIG. 3 (with a gear cover), and FIG. 5 is a sectional view taken along the line C-C of FIG. 3 (with a gear cover). 6 (a) and 6 (b) are perspective views illustrating the closed side drum, the open side drum and the drive belt, FIG. 7 is a side view illustrating the cable groove of the closed side drum, and FIG. 8 is a cable of the open side drum. The side view explaining a groove | channel is each shown.

  The vehicle 10 shown in FIG. 1 is, for example, a wagon vehicle that can accommodate eight passengers, and a relatively large opening 12 is provided on a side portion of a vehicle body 11 of the vehicle 10. The opening 12 is opened and closed by a slide door (opening / closing body) 13 movably provided on the vehicle body 11. The slide door 13 is guided by a guide rail 14 fixed to a side portion of the vehicle body 11 and moves in the front-rear direction of the vehicle body 11 between a fully closed position and a fully open position. Then, by moving the slide door 13 to the fully open position (two-dot chain line in the figure), the opening portion 12 is greatly opened, which makes it easy for an occupant to get on and off and to load and unload luggage.

  As shown in FIG. 2, a roller assembly (moving member) 15 is provided on the rear side of the slide door 13 in the vehicle body and in the vertical center of the slide door 13. The roller assembly 15 moves on the guide rail 14 along the shape of the guide rail 14, whereby the slide door 13 moves in the front-rear direction of the vehicle body 11 along the side portion of the vehicle body 11.

  On the vehicle body front side of the guide rail 14, a curved portion 14a that is curved toward the vehicle interior side (upper side in the drawing) is provided. Then, when the roller assembly 15 moves to the front side of the vehicle body and moves to the inside of the vehicle through the curved portion 14a, the slide door 13 is closed. Specifically, as shown by the chain double-dashed line in the figure, the vehicle body 11 is drawn inside and is in the [fully closed state], and is substantially flush with the side surface of the vehicle body 11.

  In addition to the roller assembly 15, the slide door 13 is provided with roller assemblies (not shown) on the front side of the vehicle body and on the upper and lower portions. Guide rails (not shown) are also provided at the upper and lower portions of the opening 12 of the vehicle body 11, corresponding to the roller assemblies at the upper and lower portions of the slide door 13. In other words, the slide door 13 is supported at a total of three positions with respect to the vehicle body 11, which enables stable opening / closing operation with respect to the vehicle body 11.

  As shown in FIG. 2, a slide door opening / closing mechanism 20 for automatically opening / closing the slide door 13 is provided on a side portion of the vehicle body 11 of the vehicle 10. The slide door opening / closing mechanism 20 includes a drive unit 30. The drive unit 30 is fixed to a vehicle body panel (not shown) forming the vehicle body 11 and is adjacent to the longitudinal center portion of the guide rail 14. There is.

  The sliding door opening / closing mechanism 20 includes a pair of reversing pulleys 21 and 22 arranged on both sides of the guide rail 14 in the longitudinal direction, a closing side cable 23 for pulling the sliding door 13 toward the closing direction (front of the vehicle body), and a slide. An open-side cable 24 that pulls the door 13 toward the opening direction (rearward of the vehicle body). Here, the closed side cable 23 constitutes the cable and the first cable in the present invention, and the open side cable 24 constitutes the second cable in the present invention.

  Then, one side in the longitudinal direction of the closed side cable 23 and the open side cable 24 is guided to the inside of the drive unit 30, respectively. On the other hand, the other side of the closing-side cable 23 and the opening-side cable 24 in the longitudinal direction is connected to the roller assembly 15 from the front and the rear of the vehicle body via a pair of reversing pulleys 21 and 22, respectively. That is, the closed-side cable 23 is connected to the front side of the roller assembly 15 (one side in the moving direction), and the open-side cable 24 is connected to the rear side of the roller assembly 15 (the other side in the moving direction).

  As a result, by driving the drive unit 30 to rotate normally, the closing-side cable 23 is pulled and the slide door 13 is moved in the closing direction. On the other hand, by driving the drive unit 30 in the reverse direction, the open side cable 24 is pulled and the slide door 13 is driven in the opening direction. That is, the drive unit 30 opens and closes the slide door 13.

  The portions of the pair of cables 23 and 24 arranged outside the vehicle body 11 are hidden by a guide groove (not shown) provided inside the guide rail 14. As a result, the pair of cables 23 and 24 are not exposed to the outside. Therefore, it is possible to protect the pair of cables 23 and 24 from rainwater, dust, and the like while improving the appearance of the vehicle 10.

  Further, outer casings 25 and 26, which cover the circumference of the pair of cables 23 and 24 and slidably hold the pair of cables 23 and 24, are provided between the pair of reversing pulleys 21 and 22 and the drive unit 30, respectively. It is provided. These outer casings 25 and 26 have flexibility, and sliding grease (not shown) is applied to the inside thereof. As a result, the pair of cables 23, 24 can be protected, and the pair of cables 23, 24 can slide smoothly with respect to the pair of outer casings 25, 26.

  As shown in FIGS. 3 to 5, the drive unit 30 includes a motor portion 40, a substrate housing portion 50, and a drum housing portion 60, which are connected by a plurality of fastening members FN (only three are shown in the drawing). They are integrated with each other. Further, among the motor portion 40, the substrate housing portion 50, and the drum housing portion 60, the drum housing portion 60 is the largest portion, and when the drum housing portion 60 is viewed in the axial direction of the rotating shaft 46, the motor portion 40 and the substrate housing portion 50 are substantially within the projection range of the drum housing portion 60.

  In this way, the motor unit 40 and the substrate housing unit 50 are made to substantially fit within the projection range of the drum housing unit 60, and the motor unit 40 and the substrate housing unit 50 are respectively arranged in a direction orthogonal to the axial direction of the rotation shaft 46. By arranging them in parallel, it is possible to prevent the thickness dimension along the axial direction of the rotary shaft 46 of the drive unit 30 from increasing.

  The motor section 40 includes a motor housing 41 made of a resin material such as plastic, and a flat plate-shaped motor cover 42 that closes an opening 41a of the motor housing 41. The motor cover 42 is also made of a resin material such as plastic so that the weight of the motor section 40 can be reduced.

  The motor housing 41 is formed in a flat, substantially cylindrical shape, and a flat electric motor 43 is housed inside the motor housing 41. The electric motor 43 is a brushless motor and includes a stator 44 formed in an annular shape and a rotor 45 rotating inside the stator 44 in the radial direction.

  The stator 44 is firmly fixed to the motor housing 41 with a fixing screw or the like (not shown). The stator 44 includes a stator core 44a formed by laminating a plurality of steel plates (not shown) made of a magnetic material, and a U-phase, V-phase, W-phase coil 44b is provided inside the stator core 44a in the radial direction. A plurality of teeth (not shown) wound with a predetermined number of windings and a winding method are provided.

  The rotor 45 includes a rotor body 45a having a substantially U-shaped cross section. The rotor body 45a is formed by pressing a steel plate and the like, and a plurality of permanent magnets 45b are fixed to the outer side in the radial direction so as to be arranged in the circumferential direction. On the other hand, an axial base end of a rotary shaft 46 made of a round steel rod is fixed to the inside of the rotor body 45a in the radial direction.

  The rotating shaft 46 has a large-diameter shaft portion 46a whose axial base end is fixed to the center of the rotor body 45a, a sun gear 46b that forms the reduction mechanism 100, and a small-diameter shaft portion that rotatably supports the closing drum 70. 46c. The rotary shaft 46 is rotatably supported by the motor housing 41.

  Specifically, a boss portion 41b, which is thicker than other portions of the motor housing 41, is provided at a substantially central portion of the motor housing 41. A pair of large-diameter ball bearings B1 is mounted inside the boss portion 41b in the radial direction. The large-diameter ball bearing B1 rotatably supports the large-diameter shaft portion 46a of the rotary shaft 46. The pair of large-diameter ball bearings B1 are provided apart from each other on both axial sides of the boss portion 41b. As a result, the rotary shaft 46 can be stably rotated at high speed without swinging.

  The board housing section 50 is provided in the vicinity of the motor section 40, and a control board 51 that controls the rotation state of the electric motor 43 is housed inside the board housing section 50. On the control board 51, a switching element 51a that supplies a driving current to the U-phase, V-phase, and W-phase coils 44b forming the electric motor 43 at high speed one after another is mounted.

  Further, the control board 51 is electrically connected to a connector connection portion 51b to which an external connector (not shown) on the vehicle 10 side is connected. As a result, the drive current from the external connector is supplied to the drive unit 30.

  Further, on the control board 51, a plurality of Hall ICs 51c (only one is shown in FIG. 4) for detecting the rotation state of the electric motor 43 are mounted. Specifically, the plurality of Hall ICs 51c are arranged close to the permanent magnet 45b provided on the rotor 45. As a result, as the rotor 45 rotates, the plurality of Hall ICs 51c generate pulse signals (rectangular wave signals) at predetermined timings.

  A CPU (not shown) to which pulse signals from a plurality of Hall ICs 51c are input is mounted on the control board 51. This allows the CPU to grasp the rotation state (rotation speed, rotation direction, etc.) of the rotor 45 and optimally control the switching element 51a. Therefore, the rotation state of the electric motor 43 is accurately controlled. As shown in FIG. 5, another electronic component EP such as a capacitor is also mounted on the control board 51.

  Further, a part (not shown in detail) of the housing 52 forming the outer shell of the substrate housing portion 50 is formed of an aluminum material or the like having a high thermal conductivity. As a result, the heat of the switching element 51a, which becomes hot during the operation of the electric motor 43, can be quickly dissipated to the outside.

  The drum housing portion 60 includes a drum housing 61 made of a resin material such as plastic, and a flat plate-shaped drum cover 62 that closes the opening 61 a of the drum housing 61. The drum cover 62 is also made of a resin material such as plastic so that the weight of the drum housing portion 60 can be reduced.

  The drum housing 61 is formed in a flat and substantially duller shape, and includes a bottom wall portion 61b and a side wall portion 61c provided upright around the bottom wall portion 61b. Inside the drum housing 61, the closing side drum 70, the opening side drum 80 and the direction changing pulley 63 are rotatably accommodated. Here, the closing side drum 70, the opening side drum 80, and the direction change pulley 63 are all made of a resin material such as plastic, thereby reducing the value of the moment of inertia of each and reducing the weight of the drive unit 30. I am trying.

  The closing drum 70 is provided coaxially with the rotation shaft 46 of the motor unit 40, and is arranged in a substantially central portion of the drum housing 61 and a portion near the motor unit 40. The closing-side cable 23 for pulling the sliding door 13 (see FIG. 2) in the closing direction is wound around the closing-side drum 70.

  Further, the open side drum 80 is provided side by side with the direction changing pulley 63 in a portion of the drum housing 61 near the substrate housing portion 50. The axis C1 of the closing drum 70 (see FIG. 4), the axis C2 of the opening drum 80 (see FIG. 5), and the axis C3 of the direction change pulley 63 (see FIG. 3) are parallel to each other. The line segment connecting the axes C1, C2, C3 is a substantially equilateral triangle. The open-side cable 24 that pulls the slide door 13 in the open direction is wound around the open-side drum 80.

  As shown in FIG. 4, a through hole 71 that axially penetrates the closing drum 70 is provided at the center of rotation of the closing drum 70, and a pair of small diameters are provided on both sides of the through hole 71 in the axial direction. A ball bearing B2 is mounted. The small-diameter ball bearing B2 on one side in the axial direction of the closing drum 70 (the motor section 40 side) is attached to the small-diameter shaft section 46c of the rotary shaft 46. On the other hand, the small-diameter ball bearing B2 on the other side in the axial direction of the closing side drum 70 (the side opposite to the motor section 40 side) is attached to the first support convex section 62a integrally provided inside the drum cover 62. . As a result, the closing drum 70 can smoothly rotate about the axis C1. That is, the closing drum 70 is rotatably supported by the small-diameter shaft portion 46c and the first supporting convex portion 62a.

  As shown in FIG. 5, a through hole 81 that axially penetrates the open drum 80 is provided at the center of rotation of the open drum 80, and a pair of small diameters are provided on both sides of the through hole 81 in the axial direction. A ball bearing B3 is mounted. Then, the small-diameter ball bearing B3 on the one side in the axial direction of the open side drum 80 (on the side of the motor portion 40) is mounted on the first support pin N1 integrally provided on the bottom wall portion 61b. On the other hand, the small-diameter ball bearing B3 on the other side in the axial direction of the closing drum 80 (the side opposite to the motor portion 40 side) is mounted on the second support convex portion 62b integrally provided inside the drum cover 62. . As a result, the open side drum 80 can smoothly rotate about the axis C2. That is, the open side drum 80 is rotatably supported by the first support pin N1 and the second support protrusion 62b.

  Further, as shown in FIG. 3, the direction changing pulley 63 changes the direction of the closing side cable 23 drawn into the drum housing 61 toward the closing side drum 70, and includes a bottom wall portion. It is rotatably supported by a second support pin N2 integrally provided on 61b. A more detailed structure of the closing-side drum 70 and the opening-side drum 80 and a state of arrangement inside the drum housing 61 will be described in detail later.

  As shown in FIG. 3, a side wall portion 61c forming the drum housing 61 is integrally provided with a close side cable guide portion 64 and an open side cable guide portion 65. The cable guide portions 64 and 65 have a function of guiding the closed side cable 23 and the open side cable 24 into the drum housing 61, and are formed in a substantially box shape. The closing-side cable guide portion 64 is arranged near the direction changing pulley 63, and guides the closing-side cable 23 from the motor portion 40 side toward the direction changing pulley 63. On the other hand, the open side cable guide portion 65 is arranged in the vicinity of the open side drum 80 and guides the open side cable 24 from the motor portion 40 side toward the open side drum 80.

  The coil springs SP are housed inside the pair of cable guides 64 and 65, respectively. These coil springs SP bias the outer casings 25 and 26 toward the outside of the drum housing 61, respectively. As a result, the minute slack in the pair of cables 23 and 24 that has expanded with the passage of time can be absorbed outside the drum housing 61.

  Here, the open side cable 24 that pulls the slide door 13 (see FIG. 2) in the open direction is wound around the open side drum 80 by the driving force of the open side drum 80. The driving force of the open side drum 80 in this case is transmitted from the close side drum 70 via the drive belt 90. The detailed structure of the drive belt 90 will also be described later.

  As shown in FIG. 4, the closing drum 70 is arranged coaxially with the electric motor 43 and is driven by the electric motor 43 with a large rotational torque. Specifically, a reduction mechanism 100 is provided between the electric motor 43 and the closing drum 70 to reduce the rotation of the rotating shaft 46 of the electric motor 43 to increase the rotation torque of the closing drum 70. .

  The speed reduction mechanism 100 is a planetary gear speed reducer, and includes a sun gear 46b that is provided integrally with the rotary shaft 46, and three planetary gears 101 that are engaged with the sun gear 46b and are rotatable around the sun gear 46b (shown in the drawing). 2)), an outer gear 102 that is provided around the planetary gear 101 and meshes with the planetary gear 101, and a planet carrier 103 that holds the three planetary gears 101 and that rotates in accordance with the revolution movement of the planetary gear 101. , Are provided.

  More specifically, the outer gear 102 is formed in an annular shape and is sandwiched between the motor housing 41 and the drum housing 61. That is, the outer gear 102 is firmly fixed to the housings 41 and 61 so as not to rotate. The planet carrier 103 is for transmitting a rotational force to the closing drum 70, and the planet carrier 103 is integrally rotatably connected to the closing drum 70.

  A small-diameter ball bearing B4 is mounted on the radially inner side of the planet carrier 103, and the small-diameter ball bearing B4 is mounted on the small-diameter shaft portion 46c of the rotary shaft 46. As a result, the planet carrier 103 can smoothly rotate relative to the rotation shaft 46.

  To describe the operation of the speed reduction mechanism 100, first, the rotary shaft 46 of the electric motor 43 is rotated at high speed. Then, the sun gear 46b is also rotated at high speed as the rotary shaft 46 rotates. At this time, since the outer gear 102 is fixed to the housings 41 and 61, the three planetary gears 101 revolve around the sun gear 46b while rolling. The revolution speed of the planetary gear 101 at this time is much lower than the rotation speed of the sun gear 46b. As a result, the planetary carrier 103 holding the planetary gear 101 is rotated at a low speed and with a high torque, and the closing side drum 70 is rotated with a large rotational torque.

  Inside the drum housing 61, the closing side drum 70, the opening side drum 80, and the drive belt 90 are accommodated in the arrangement relationship as shown in FIG. The lower side of FIG. 6A and the upper side of FIG. 6B are one side in the axial direction of the drums 70 and 80 and face the motor section 40. . On the other hand, the upper side in the figure of FIG. 6A and the lower side in the figure of FIG. 6B are the other sides in the axial direction of the respective drums 70 and 80 and the side facing the drum cover 62.

  The closing side drum 70 constitutes the drum and the first drum of the present invention, and has a shape as shown in FIGS. 6 and 7. The closing drum 70 is formed of a resin material such as plastic into a substantially disc shape, and a through hole 71 into which a pair of small diameter ball bearings B2 (see FIG. 4) is mounted is formed at the center of rotation thereof.

  A closing side power transmission section 72 is provided at one end (lower side in FIG. 7) of the closing side drum 70 in the axial direction. The closing-side power transmission portion 72 includes a closing-side belt meshing portion 72a and three engaging claws 72b. The closing side belt meshing portion 72a is provided with a plurality of irregularities (not shown in detail), and the rubber teeth 91 of the drive belt 90 are meshed with the closing side belt meshing portion 72a.

  Further, the three engaging claws 72b are provided at equal intervals (at intervals of 120 degrees) in the circumferential direction of the closing drum 70, and project in the axial direction of the closing drum 70. These engaging claws 72b are adapted to be hooked on the planet carrier 103 (see FIG. 4) of the speed reduction mechanism 100. As a result, the rotational force of the planet carrier 103 is transmitted to the closing drum 70.

  A small-diameter portion 73 around which the closing-side cable 23 is wound is provided on one side in the axial direction of the closing-side drum 70 and on the drum cover 62 side (upper side in FIG. 7) than the closing-side power transmission portion 72. There is. The small-diameter portion 73 is provided with a spiral small-diameter cable groove 73a, and the winding diameter of the closing-side cable 23 wound around the small-diameter cable groove 73a is D1 → D2 → D3 toward the closing-side power transmission portion 72. Is gradually decreasing (D1> D2> D3).

  On the other side in the axial direction of the closing drum 70 (on the drum cover 62 side), a large diameter portion 74 around which the closing cable 23 is wound is provided. The large diameter portion 74 has a larger diameter than the small diameter portion 73, and the large diameter portion 74 is provided with a spiral large diameter cable groove 74a. The winding diameter of the close-side cable 23 wound around the large-diameter cable groove 74a is D4 which is constant throughout the large-diameter cable groove 74a.

  The winding diameter D4 of the large diameter cable groove 74a is larger than the winding diameter D1 of the largest diameter portion of the small diameter cable groove 73a (D4> D1).

  The large-diameter cable groove 74a is connected to the small-diameter cable groove 73a at a substantially central portion along the axial direction of the closing drum 70. That is, the large-diameter cable groove 74a and the small-diameter cable groove 73a are one continuous spiral cable groove.

  The end portion of the closing side cable 23 wound around the closing side drum 70 is fixed to the other side in the axial direction of the closing side drum 70, that is, the large diameter portion 74 side. That is, as the closing side cable 23 is wound around the closing side drum 70, the closing side cable 23 is gradually wound from the large diameter cable groove 74a to the small diameter cable groove 73a. At this time, just before the closing of the closing side cable 23 (when the sliding door 13 is substantially fully closed), the closing side cable 23 is wound around the portion of the small diameter cable groove 73a having the smallest winding diameter D3. .

  Here, the large diameter cable groove 74a has the same winding diameter D4 in the entire area. As a result, even if the closing-side cable 23 is wound around, the closing-side cable 23 is less likely to fall off the large-diameter cable groove 74a. Therefore, the groove pitch P1 of the large-diameter cable groove 74a is as narrow as possible, thereby suppressing an increase in the axial dimension of the closing drum 70. More specifically, a partition wall 74b having a thickness dimension of about T1 (about 1.0 mm) is provided between the adjacent large-diameter cable grooves 74a.

  On the other hand, the winding diameter of the small-diameter cable groove 73a is gradually reduced as D1 → D2 → D3 toward the closing side power transmission portion 72. Therefore, in the partition wall 74b having the same groove pitch P1 as the large-diameter cable groove 74a and the same thickness dimension T1, the closing-side cable 23 may fall off from the small-diameter cable groove 73a as the closing-side cable 23 is wound. There is.

  Therefore, in the present embodiment, the groove pitch P2 of the small diameter cable groove 73a is set larger than the groove pitch P1 of the large diameter cable groove 74a (P2> P1). Thus, a relatively thick partition wall 73b having a thickness dimension of T2 (about 5.0 mm) is provided between the adjacent small-diameter cable grooves 73a (T2> T1).

  By increasing the thickness of the partition wall 73b to T2 in this way, the rigidity of the partition wall 73b is sufficiently increased. Therefore, the height dimension H of the partition wall 73b can be increased (the depth dimension of the small-diameter cable groove 73a can be increased), which also reliably prevents the closing-side cable 23 from falling off the small-diameter cable groove 73a. ing.

  Further, as shown in FIG. 4, a part of the drum housing 61 provided around the closing side drum 70 is inclined according to the outer shape of the portion of the closing side drum 70 where the small diameter portion 73 is provided. An inclined portion 61d is provided. The inclined portion 61d faces the tip portion of the partition wall 73b, which also reliably prevents the closing-side cable 23 from falling out of the small-diameter cable groove 73a.

  In this way, the winding start of the closing side cable 23 with respect to the closing side drum 70 is the large diameter cable groove 74a, and the winding end of the closing side cable 23 with respect to the closing side drum 70 is the small diameter cable groove 73a. Therefore, without controlling the rotation speed of the electric motor 43, it is possible to move the slide door 13 quickly at the beginning of closing and slowly move the slide door 13 at the end of closing. That is, the moving speed of the slide door 13 is variable regardless of the control of the electric motor 43.

  The open side drum 80 constitutes the second drum of the present invention, and has a shape as shown in FIGS. 6 and 8. The open side drum 80 is formed of a resin material such as plastic into a substantially disc shape, and a through hole 81 into which a pair of small diameter ball bearings B3 (see FIG. 5) is mounted is formed at the center of rotation thereof.

  An open side power transmission portion 82 is provided at one end (downward in FIG. 8) of the open side drum 80 in the axial direction. The open-side power transmission portion 82 includes an open-side belt meshing portion 82a. The open side belt meshing portion 82a has a plurality of irregularities (not shown in detail), and the rubber teeth 91 of the drive belt 90 are meshed with the open side belt meshing portion 82a. Since the open side drum 80 is driven by the close side drum 70 via the drive belt 90, the open side drum 80 does not include the engaging claw 72b (see FIG. 7) provided on the close side drum 70.

  A large-diameter portion 83 around which the open-side cable 24 is wound is provided on one side in the axial direction of the open-side drum 80 and on the drum cover 62 side (upper side in FIG. 8) than the open-side power transmission section 82. ing. The large-diameter portion 83 is provided with a spiral large-diameter cable groove 83a, and the winding diameter of the open-side cable 24 wound around the large-diameter cable groove 83a is large throughout the large-diameter cable groove 83a. It is constant at d1 which is substantially equal to the outer diameter of the portion 83.

  A small diameter portion 84 around which the open side cable 24 is wound is provided on the other side in the axial direction of the open side drum 80 (drum cover 62 side). The small diameter portion 84 has a smaller diameter than the large diameter portion 83, and the small diameter portion 84 is provided with a spiral small diameter cable groove 84a. Then, the winding diameter of the open-side cable 24 wound around the small-diameter cable groove 84a is gradually reduced toward the other side in the axial direction of the open-side drum 80 (upper side in FIG. 8) as d2 → d3 → d4. (D2> d3> d4).

  The winding diameter d1 of the large diameter cable groove 83a is larger than the winding diameter d2 of the largest diameter portion of the small diameter cable groove 84a (d1> d2).

  The large-diameter cable groove 83a is connected to the small-diameter cable groove 84a at a substantially central portion along the axial direction of the open side drum 80. That is, the large diameter cable groove 83a and the small diameter cable groove 84a are one continuous spiral cable groove.

  The end portion of the open side cable 24 wound around the open side drum 80 is fixed to the other side in the axial direction of the open side drum 80, that is, the small diameter portion 84 side. That is, as the open side cable 24 is wound around the open side drum 80, the open side cable 24 is gradually wound from the small diameter cable groove 84a to the large diameter cable groove 83a. At this time, just before the end of winding of the open side cable 24 (when the slide door 13 is substantially fully opened), the open side cable 24 is wound around the portion of the large diameter cable groove 83a having the largest winding diameter d1. .

  Here, the large-diameter cable groove 83a has the same winding diameter d1 over its entire area. As a result, even if the open side cable 24 is wound around, the open side cable 24 is less likely to fall out of the large diameter cable groove 83a. Therefore, the groove pitch p1 of the large-diameter cable groove 83a is narrowed as much as possible, thereby suppressing an increase in the axial dimension of the open side drum 80. More specifically, a partition wall 83b having a thickness dimension of about t1 (about 1.0 mm) is provided between the adjacent large-diameter cable grooves 83a.

  On the other hand, the winding diameter of the small-diameter cable groove 84a gradually decreases as it goes toward the other side in the axial direction of the open side drum 80, d2 → d3 → d4. Therefore, in the partition wall 83b having the same groove pitch p1 as the large-diameter cable groove 83a and the same thickness dimension t1, the open-side cable 24 may drop from the small-diameter cable groove 84a as the open-side cable 24 is wound. There is.

  Therefore, in the present embodiment, the groove pitch p2 of the small diameter cable groove 84a is set to be larger than the groove pitch p1 of the large diameter cable groove 83a (p2> p1). As a result, a relatively thick partition wall 84b having a thickness dimension of t2 (about 5.0 mm) is provided between the adjacent small-diameter cable grooves 84a (t2> t1).

  By thus increasing the thickness dimension of the partition wall 84b to t2, the rigidity of the partition wall 84b is sufficiently enhanced. Therefore, the height dimension h of the partition wall 84b can be increased (the depth dimension of the small-diameter cable groove 84a can be increased), which also reliably prevents the open-side cable 24 from falling off the small-diameter cable groove 84a. ing.

  Further, as shown in FIG. 5, a part of the drum cover 62 provided so as to cover the open side drum 80 is inclined according to the outer shape of the part of the open side drum 80 where the small diameter portion 84 is provided. The inclined portion 62c is provided. The inclined portion 62c faces the tip portion of the partition wall 84b, which also reliably prevents the open-side cable 24 from falling out of the small-diameter cable groove 84a.

  As shown by the hatched portion in FIG. 6, a drive belt 90 that transmits the driving force of the closing drum 70 to the opening drum 80 is provided between the closing drum 70 and the opening drum 80. . The drive belt 90 is formed in an annular shape from a flexible elastic material such as natural rubber, and inside the drive belt 90, a plurality of meshed portions are engaged with both the closed side belt meshing portion 72a and the open side belt meshing portion 82a. Rubber teeth 91 are integrally provided.

  Here, although not shown, a reinforcing member (for example, glass fiber, carbon fiber, or the like) that prevents the drive belt 90 from extending under high load is embedded inside the drive belt 90. As a result, the driving force of the closing side drum 70 is efficiently transmitted to the opening side drum 80, which in turn prevents the rotation difference between the closing side drum 70 and the opening side drum 80.

  The drive belt 90 also has a function as a timing belt that matches the rotation timings of the closing drum 70 and the opening drum 80.

  Specifically, the open-side cable 24 (see FIG. 3) is wound at the timing when the close-side cable 23 (see FIG. 3) is wound around the small-diameter cable groove 73a (see FIG. 7) in the small-diameter portion 73 of the close-side drum 70. It is wound around the small diameter cable groove 84a (see FIG. 8) in the small diameter portion 84 of the open side drum 80 (state A). In this "state A", the slide door 13 is at a predetermined position with respect to the opening 12, that is, a substantially central portion of the path between the fully closed position and the fully open position of the slide door 13, and the position at which the opening 12 is fully closed. To be moved between.

  On the other hand, at the timing when the open-side cable 24 is wound around the large-diameter cable groove 83a (see FIG. 8) in the large-diameter portion 83 of the open-side drum 80, the closed-side cable 23 is large in the large-diameter portion 74 of the closed-side drum 70. It is wound around the diameter cable groove 74a (see FIG. 7) (state B). In this “state B”, the slide door 13 has a predetermined position with respect to the opening 12, that is, a substantially central portion of the path between the fully closed position and the fully open position of the slide door 13, and a position where the opening 12 is fully opened. Will be moved between.

  Next, the operation of the drive unit 30 formed as described above will be described in detail with reference to the drawings.

  FIG. 9A is a diagram showing the [open state] in which the open side cable is wound around the open side drum, and FIG. 9B is a diagram showing the [fully closed state] in which the closed side cable is wrapped around the closed side drum. FIG. 10 is an explanatory diagram for explaining the change in cable length, FIG. 11 is a graph for explaining the change in cable length, and FIG. 12 is a graph for explaining the door closer function.

[When closing the sliding door]
First, the operation when the slide door 13 is closed from the state shown by the solid line in FIG. 2, that is, the slide door 13 is completely open [full open state] will be described.

  When the operator “closes” an operation switch (not shown), the electric motor 43 (see FIG. 4) is driven in the normal direction. Then, as shown in FIG. 9A, the closing side drum 70 is rotationally driven in the direction of the arrow “closed” with a large rotational torque via the speed reduction mechanism 100 (see FIG. 4). As a result, the closing-side cable 23 is gradually wound around the large-diameter cable groove 74a of the closing-side drum 70 to the small-diameter cable groove 73a (see FIG. 7). Therefore, the roller assembly 15 is pulled forward of the vehicle body, and the slide door 13 moves in the closing direction.

  At this time, the open side cable 24 is gradually fed out from the state in which it is wound around both the small diameter cable groove 84a and the large diameter cable groove 83a (see FIG. 8) of the open side drum 80. Specifically, the open side drum 80 is rotationally driven in the direction of the arrow “closed” via the drive belt 90 as the close side drum 70 rotates. As a result, the open side cable 24 is pulled out by the roller assembly 15 and the open side drum 80 is rotationally driven, so that the open side cable 24 is sent out of the drum housing 61 (see FIG. 3). At this time, the open-side cable 24 is first sent out from the large-diameter cable groove 83a of the open-side drum 80, and subsequently sent out from the small-diameter cable groove 84a.

  Here, when the closing side cable 23 is wound around the large diameter cable groove 74a of the closing side drum 70 from the small diameter cable groove 73a, the opening side cable 24 is sent out from the large diameter cable groove 83a of the opening side drum 80 first. Then, it is sent out from the small-diameter cable groove 84a. As a result, the total length (cable length) of each of the cables 23 and 24 drawn out of the drum housing 61 is kept substantially constant. Therefore, the cables 23 and 24 do not loosen, and rattling of the slide door 13 is effectively suppressed.

  In this way, the change in the cable lengths of the close side cable 23 and the open side cable 24 is suppressed during the operation of the drive unit 30, so that the drive unit 30 omits the tensioner mechanism, which is a relatively large component. As shown in FIG. 3, a coil spring SP is provided in each of the closed-side cable guide portion 64 and the open-side cable guide portion 65. However, the coil springs SP extend over time. The cable 23, 24 is for removing a slight slack, and is a component sufficiently smaller than the tensioner mechanism described above.

  Here, the slide door 13 is drawn into the inside of the vehicle body 11 when it is almost closed (see FIG. 2). Therefore, the roller assembly 15 for moving the slide door 13 passes through the curved portion 14a of the guide rail 14 as shown in FIG. At this time, since the roller assembly 15 passes through the radially outermost portion of the curved portion 14a, the closed cable 23 is pulled to the radially outer side of the curved portion 14a as indicated by a broken arrow L. That is, the closing-side cable 23 is closer to the fully closed position of the slide door 13 (roller assembly 15) than in the case where the sliding door 13 (roller assembly 15) is at the fully open position (broken line in the figure). In some cases (indicated by the solid line in the figure), a larger amount is sent to the outside of the drum housing 61.

  Specifically, as shown in FIG. 11, when the slide door 13 is in the “fully open state”, that is, when the roller assembly 15 is at the position “1” of the guide rail 14 (on the rear side of the vehicle body), The amount of change is −2 mm. The amount of change in the cable length when the slide door 13 is in the "fully closed state", that is, when the roller assembly 15 is at the position "2" of the guide rail 14 (front side of the vehicle body) is 0 mm. Therefore, when the sliding door 13 is in the "fully opened state", the amount of change in cable length (-2 mm) can be sufficiently absorbed by the function of the coil spring SP.

  On the other hand, when the slide door 13 is close to the fully closed position and is located at the rear side of the vehicle body by about 80 mm from the [fully closed state], that is, the roller assembly 15 is located at the position "3" of the guide rail 14 (the curved portion). The amount of change in the cable length at the position (14a) is about 12 mm, which is the maximum. Since the change amount (change amount) of the cable length of the closing side cable 23 at this time is relatively large, it cannot be absorbed only by the function of the coil spring SP provided in the closing side cable guide portion 64. Therefore, the winding diameter of the small diameter portion 73 of the closing drum 70 is set to be small like D2 and D3 (see FIG. 7) so that the change in the cable length is absorbed in the portion.

  More specifically, the winding diameters (diameter dimensions) D2 and D3 of the small diameter portion 73 of the closing drum 70 are smaller than the winding diameters (diameter dimension) d3 and d4 of the small diameter portion 84 of the opening drum 80 (Fig. 8)) (D2 <d3, D3 <d4). On the other hand, the winding diameter (diameter dimension) D4 of the large diameter portion 74 of the closing drum 70 and the winding diameter (diameter dimension) d1 of the large diameter portion 83 of the opening drum 80 are the same. (D4 = d1).

  That is, the winding diameters D2 and D3 of the small-diameter portion 73 of the closing drum 70 correspond to the change in the sending amount of the closing cable 23 from the closing drum 70 (increase of about 12 mm) that occurs during the movement of the slide door 13. It is sized to absorb. Specifically, the timing at which the small-diameter portion 73 absorbs the change amount of the sending amount of the closing-side cable 23 from the closing-side drum 70 (increase of about 12 mm) is in the above-mentioned “state A”. is there. That is, when the slide door 13 moves between the substantially central portion of the path between the fully closed position and the fully open position and the position at which the opening 12 is fully closed, the small diameter portion 73 causes the closed side cable 23 to move. The change amount of the delivery amount from the closing drum 70 (increase of about 12 mm) is absorbed. In other words, when the roller assembly 15 passes through the curved portion 14a of the guide rail 14, the small diameter portion 73 absorbs the change in the amount of feeding the closing cable 23 from the closing drum 70 (increase of about 12 mm). Has become.

  As a result, the relatively large change in cable length (about 12 mm increase) that occurs during the movement of the slide door 13 can be absorbed by the small diameter portion 73 of the closing drum 70. Therefore, even if the tensioner mechanism as described above is not specially provided, when the slide door 13 is moving toward the fully closed position, the operation of the drive unit 30 becomes sluggish due to an increase in resistance, or the slide door 13 rattles. It is possible to effectively keep from sticking.

  Then, as the drive unit 30 is continuously closed, the slide door 13 is further retracted inside the vehicle body 11. Then, finally, a door locker (not shown) provided on the slide door 13 and a door striker (not shown) provided on the vehicle body 11 are engaged with each other to be in a locked state, and the slide door 13 is It becomes a completely closed [fully closed state]. As described above, the drive unit 30 according to the present embodiment has a door closer function of locking the slide door 13 in the fully closed state, in addition to the function of opening and closing the slide door 13.

  Here, as shown in FIG. 12, the drive unit 30 is configured to generate a relatively large cable pulling force [N] when the slide door 13 is moved to the fully closed position. The broken line graph in FIG. 12 shows the characteristics of the drive unit (not shown) of the comparative example. Further, the drive unit of the comparative example employs a drum having the same winding diameter of the cable (a drum in which the winding diameter of the cable does not change).

  As shown in the solid line graph (invention) of FIG. 12, when the roller assembly 15 is in the position of “a” which moves on the guide rail 14 and approaches the curved portion 14a, it is as large as about 600N in the present invention. Cable pulling force is generated. This is because the winding diameter of the small diameter portion 73 of the closing drum 70 is set to a small diameter such as D2 and D3 (see FIG. 7).

  Here, when the roller assembly 15 passes through the curved portion 14a, the movement resistance increases as compared with the case where the roller assembly 15 passes through the straight portion of the guide rail 14. In the present invention, since the closing-side cable 23 is pulled with a large cable pulling force (about 600 N), the slide door 13 can be moved smoothly while the slide door 13 is fully closed. On the other hand, in the comparative example, the cable is pulled with a cable pulling force of about 400 N, which is smaller than that of the present invention, and therefore there is a possibility that smooth movement of the slide door may be hindered when it is fully closed.

  Further, when the roller assembly 15 is at the position "b" after moving on the guide rail 14 and passing through the curved portion 14a, that is, the sliding door 13 is in the locked state (the door rocker and the door striker are engaged with each other. In the present invention, a large cable pulling force of about 600 N is generated even when the cable is in a position where the cable is in the state of (1). This is because the winding diameter of the small diameter portion 73 of the closing drum 70 is set to a small diameter like D2 and D3 (see FIG. 7), as described above.

  Therefore, the drive unit 30 of the present invention also has a door closer function that requires a large driving force, and thus it is not necessary to separately provide a door closer device on the vehicle body 11. On the other hand, in the comparative example, when the slide door is in the locked state, the cable can be pulled only by a cable pulling force of about 400 N, which is smaller than that of the present invention. Therefore, in the comparative example, the pulling force for locking the slide door has no margin, and the function as the door closer cannot be achieved. In addition, in order to fully demonstrate the door closer function, it is necessary to devise a stable output of cable pulling force of at least 400N.

  In the drive unit 30 of the present invention, the cable pulling force of the closing side cable 23 is as large as about 600 N, which is higher than that of the closing side drum 70 that needs to be driven with high torque as described above. This is also due to the fact that the electric motor 43 is arranged coaxially (see FIG. 4) and the drive torque of the electric motor 43 can be transmitted to the closing side drum 70 with high efficiency.

[When opening the sliding door]
When the operation switch is “opened” by the operator, the electric motor 43 is driven in reverse. Then, as shown in FIG. 9B, the open side drum 80 is rotationally driven in the direction of the arrow “open” via the drive belt 90. As a result, the open-side cable 24 is gradually wound around the small-diameter cable groove 84a of the open-side drum 80 to the large-diameter cable groove 83a (see FIG. 8). Therefore, the roller assembly 15 (see FIG. 2) is pulled toward the rear of the vehicle body, and the slide door 13 moves in the opening direction.

  At this time, the closing side cable 23 is gradually sent out from the state of being wound around both the small diameter cable groove 73a and the large diameter cable groove 74a (see FIG. 7) of the closing side drum 70. Specifically, the closing side drum 70 is rotationally driven in the direction of the arrow “open”, whereby the closing side cable 23 is pulled by the roller assembly 15 and the closing side drum 70 is rotationally driven. , And is sent out of the drum housing 61. At this time, the closing-side cable 23 is first sent out from the small-diameter cable groove 73a of the closing-side drum 70, and subsequently sent out from the large-diameter cable groove 74a.

  In this way, when the slide door 13 is opened, the reverse operation is followed as compared with the above [when the slide door is closed]. In addition, when the sliding door 13 is opened, a large cable pulling force is not required as compared with the case where the sliding door 13 is closed and locked. Therefore, even with the drive torque of the open side drum 80 via the drive belt 90, the slide door 13 can be sufficiently opened without the drive belt 90 extending or coming off.

  As described above in detail, according to the drive unit 30 of the present embodiment, the closing-side cable 23 that pulls the slide door 13 in the closing direction and the closing-side cable 23 are wound, and the small diameter is provided on one side in the axial direction. And the closing side drum 70 having the large diameter portion 74 on the other side in the axial direction, and the winding diameters D2 and D3 of the small diameter portion 73 of the closing side cable 23 generated in the movement process of the slide door 13. It is of a size that absorbs a change in the delivery amount from the closing drum 70 (an increase of about 12 mm).

  As a result, in the small diameter portion 73 of the closing drum 70, a change amount (an increase of about 12 mm) of the sending amount of the closing cable 23 from the closing drum 70 that occurs during the movement process of the slide door 13 can be absorbed, It becomes possible to abolish the large tensioner mechanism composed of a plurality of parts as in the past. Therefore, the drive unit 30 can be made smaller and lighter.

  Further, according to the drive unit 30 of the present embodiment, the closing side drum 70 around which the closing side cable 23 is wound and the opening side drum 80 around which the opening side cable 24 is wound are provided. Thus, the axial dimension of the drum can be reduced as compared with the case where two cables are wound around one drum.

  Therefore, the thickness dimension of the drive unit 30 along the axial direction of the closing-side and opening-side drums 70, 80 can be made thinner (smaller) than the conventional one.

  It is needless to say that the present invention is not limited to the above-mentioned embodiment and can be variously modified without departing from the gist thereof. For example, in the above embodiment, the closing side drum 70 corresponding to the closing side cable 23 and the opening side drum 80 corresponding to the opening side cable 24 are individually provided, but the present invention is not limited to this. However, the present invention is not limited to this, and the closing-side cable 23 and the opening-side cable 24 can be applied to a drive unit similar to the conventional one in which the drums are wound around the drums in opposite directions.

  In addition, in the above-described embodiment, the three-phase brushless motor is adopted as the electric motor 43, but the present invention is not limited to this, and an electric motor of other specifications such as an electric motor with a brush is adopted. May be.

  Further, although the drive belt 90 is made of natural rubber or the like in the above-described embodiment, the present invention is not limited to this, and power transmission between the closing side drum 70 and the opening side drum 80 is possible. If so, other specifications such as a metal chain may be adopted.

  In addition, the material, shape, size, number, installation location, etc. of each constituent element in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited to the above-described embodiment.

10 vehicle 11 vehicle body 12 opening 13 sliding door (opening / closing body)
14 Guide rail 14a Curved part 15 Roller assembly (moving member)
20 Sliding door opening / closing mechanism 21, 22 Inverting pulley 23 Closing side cable (cable, first cable)
24 Open side cable (2nd cable)
25, 26 Outer casing 30 Drive unit 40 Motor part 41 Motor housing 41a Opening part 41b Boss part 42 Motor cover 43 Electric motor 44 Stator 44a Stator core 44b Coil 45 Rotor 45a Rotor body 45b Permanent magnet 46 Rotation shaft 46a Large diameter shaft part 46b Sun gear 46c Small-diameter shaft portion 50 Substrate housing portion 51 Control board 51a Switching element 51b Connector connection portion 51c Hall IC
52 housing 60 drum accommodating portion 61 drum housing 61a opening 61b bottom wall portion 61c side wall portion 61d inclined portion 62 drum cover 62a first supporting convex portion 62b second supporting convex portion 62c inclined portion 63 direction changing pulley 64 closing side cable guide Part 65 Open cable guide part 70 Closed drum (drum, first drum)
71 Through-hole 72 Closed side power transmission part 72a Closed side belt meshing part 72b Engaging claw 73 Small diameter part 73a Small diameter cable groove 73b Partition wall 74 Large diameter part 74a Large diameter cable groove 74b Partition wall 80 Open side drum (2nd drum)
81 through hole 82 open side power transmission part 82a open side belt meshing part 83 large diameter part 83a large diameter cable groove 83b partition wall 84 small diameter part 84a small diameter cable groove 84b partition wall 90 drive belt 91 rubber teeth 100 reduction mechanism 101 planetary gear 102 outer gear 103 Planet carrier B1 Large-diameter ball bearing B2-B4 Small-diameter ball bearing EP Electronic component FN Fastening member N1 First support pin N2 Second support pin SP Coil spring

Claims (4)

A drive unit for driving an opening / closing body that opens and closes an opening,
A cable for pulling the opening / closing body,
A drum around which the cable is wound and which has a small diameter portion on one side in the axial direction and a large diameter portion on the other side in the axial direction,
Have
The winding diameter of the small diameter portion is sized to absorb a change in the amount of the cable fed from the drum that occurs during the movement of the opening / closing body.
Drive unit. The drive unit according to claim 1,
The cable is
A first cable for pulling the opening / closing body in a closing direction;
A second cable for pulling the opening / closing body in the opening direction;
Equipped with
The drum is
A first drum around which the first cable is wound,
A second drum around which the second cable is wound,
Equipped with
In a state where the first cable is wound around the small diameter portion of the first drum and the second cable is wound around the small diameter portion of the second drum, the opening / closing body is located at a predetermined position in the opening. Move between the position where the opening is fully closed,
In a state in which the first cable is wound around the large diameter portion of the first drum and the second cable is wound around the large diameter portion of the second drum, the opening / closing body is located at a predetermined position in the opening. And between the position where the opening is fully opened,
The first drum of the first cable when the winding diameter of the small diameter portion of the first drum moves between the opening and closing body at a predetermined position in the opening and a position at which the opening is fully closed. It is sized to absorb the change in the amount sent from
Drive unit. The drive unit according to claim 2,
The opening / closing body is provided with a moving member that is provided on the vehicle body and that moves along a guide rail that has a curved portion that is curved toward the vehicle interior on the front side of the vehicle body,
The first cable is connected to one side in the moving direction of the moving member,
The second cable is connected to the other side in the moving direction of the moving member,
The small diameter portion of the first drum has a winding diameter that is large enough to absorb a change in the amount of the first cable fed from the first drum when the moving member passes through the curved portion.
Drive unit. The drive unit according to claim 2 or 3,
The winding diameter of the large diameter portion of the first drum and the winding diameter of the large diameter portion of the second drum are the same,
The winding diameter of the small diameter portion of the first drum is smaller than the winding diameter of the small diameter portion of the second drum,
Drive unit.

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