JP7232012B2 - drive unit - Google Patents

Description

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

2. Description of the Related Art A vehicle such as a one-box vehicle is provided with an opening for getting in and out of a passenger and for loading and unloading luggage. The opening is relatively large and is opened and closed by a slide door provided 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 capable of automatically opening and closing the sliding door.

The sliding door opening/closing mechanism has a drive unit. The drive unit is provided with a closing side cable and an opening side cable for pulling the sliding door in the closing direction and the opening direction. The drive unit includes a drum on which the closing cable and the opening cable are wound in opposite directions, and by rotating the drum forward or backward, the closing cable or the opening cable is driven, thereby moving the sliding door. is opened and closed.

Such a drive unit is described, for example, in US Pat. A 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 changes in the amount of cable sent out from the drum during the movement of the sliding door, and prevents the cable from becoming slack.

JP 2009-299344 A

However, the drive unit described in the above-mentioned Patent Document 1 includes a pair of tensioner mechanisms in order to absorb the change in the amount of cable feed from the drum. The tensioner mechanism includes a tensioner pulley, a pulley holder that movably supports the tensioner pulley in a cable feed-out 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, the tensioner mechanism is a relatively large component among the components forming the drive unit, making it difficult to further reduce the size and weight of the drive unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drive unit that can be further reduced in size and weight.

According to one aspect of the present invention, there is provided a drive unit for driving an opening/closing body that opens and closes an opening, wherein a first cable and a second cable for pulling the opening/closing body are wound around the first cable, and are aligned in the axial direction. A first drum having a small-diameter portion on one side and a large-diameter portion on the other axial side, and a second drum around which the second cable is wound and provided with a large-diameter portion on one axial side and a small-diameter portion on the other axial side. 2 drums, wherein the axis of the first drum and the axis of the second drum are provided parallel to each other, and the winding diameter of the small diameter portion of the first drum is equal to the opening and closing body It is sized to absorb a change in the feed amount of the first cable from the first drum that occurs during the moving process.

In another aspect of the present invention, the first cable wound around the first drum pulls the opening /closing body in a closing direction, and the second cable wound around the second drum pulls the opening/ closing body. is pulled in the opening direction , 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. It moves between a predetermined position in the opening and a position in which the opening is fully closed, the first cable is wound around the large-diameter portion of the first drum, and the second cable is wound on the second drum. In the state of being wound around the large-diameter portion of the drum, the opening/closing member moves between a predetermined position in the opening and a position where the opening is fully opened. is large enough to absorb a change in the feed amount of the first cable from the first drum when the opening/closing member moves between a predetermined position in the opening and a position in which the opening is fully closed. It is becoming

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 curves toward the interior of the vehicle on the front side of the vehicle body, and the moving member 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, and the winding diameter of the small diameter portion of the first drum is set so that the moving member is It is sized to absorb a change in the feed amount of the first cable 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 the same. 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, the cable for pulling the opening/closing body and the drum around which the cable is wound are provided with a small-diameter portion on one side in the axial direction and a large-diameter portion on the other side in the axial direction. The hanging diameter is sized to absorb the change in the amount of cable sent out from the drum that occurs during the movement of the opening/closing body.

As a result, the small-diameter portion of the drum can absorb the change in the amount of cable sent out from the drum that occurs during the movement of the opening/closing member, and the conventional large tensioner mechanism consisting of multiple parts can be eliminated. It becomes 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; FIG. 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 of FIG. 2 as seen from the direction of arrow A; 4 is a cross-sectional view (with a gear cover) taken along line BB in FIG. 3; FIG. FIG. 4 is a cross-sectional view (with a gear cover) taken along line CC of 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 the closing side drum. It is a side view explaining the cable groove of the opening side drum. (a) is a diagram showing a [fully open state] in which an opening side cable is wound around an opening side drum, and (b) is a diagram showing a [fully closed state] in which a closing side cable is wound around a closing drum. . It is an explanatory view explaining change of cable length. It is a graph explaining the change of cable length. It is a graph explaining a door closer function.

An embodiment of the present invention will be described in detail below 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 for explaining the mounting structure of the sliding door to the vehicle body, and FIG. 3 is the drive unit of FIG. 4 is a cross-sectional view along line BB of FIG. 3 (with gear cover), and FIG. 5 is a cross-sectional view along line CC of FIG. 3 (with gear cover). 6(a) and 6(b) are perspective views explaining the closing drum, the opening drum and the drive belt, FIG. 7 is a side view explaining the cable groove of the closing drum, and FIG. 8 is the cable of the opening drum. 4A and 4B each show a side view illustrating the groove.

A vehicle 10 shown in FIG. 1 is, for example, a station wagon capable of accommodating eight passengers, and a vehicle body 11 of the vehicle 10 is provided with a relatively large opening 12 at a side portion thereof. The opening 12 is opened and closed by a slide door (opening/closing body) 13 movably provided on the vehicle body 11 . The sliding door 13 is guided by a guide rail 14 fixed to the side of the vehicle body 11 and moves in the longitudinal direction of the vehicle body 11 between a fully closed position and a fully open position. By moving the slide door 13 to the fully open position (two-dot chain line in the figure), the opening 12 is opened wide, thereby facilitating boarding and alighting of passengers and loading and unloading of luggage.

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

A curved portion 14a is provided on the front side of the vehicle body of the guide rail 14. The curved portion 14a is curved toward the interior side of the vehicle (upper side in the figure). Then, when the roller assembly 15 moves toward the front side of the vehicle body and toward the inside of the passenger compartment through the portion of the curved portion 14a, the slide door 13 is closed. Specifically, as indicated by a two-dot chain line in the figure, it is pulled into the inside of the vehicle body 11 to be in a fully closed state, and is substantially flush with the side surfaces of the vehicle body 11 .

In addition to the roller assembly 15, the slide door 13 is also provided with roller assemblies (not shown) on the front side of the vehicle body and on the upper and lower portions thereof. Further, guide rails (not shown) are also provided at the upper and lower portions of the opening 12 of the vehicle body 11 so as to correspond to the roller assemblies at the upper and lower portions of the slide door 13, respectively. In other words, the sliding door 13 is supported at a total of three points with respect to the vehicle body 11 , thereby enabling stable opening and closing operations with respect to the vehicle body 11 .

As shown in FIG. 2 , a sliding door opening/closing mechanism 20 for automatically opening/closing the sliding door 13 is provided on the side of the vehicle body 11 of the vehicle 10 . The sliding door opening/closing mechanism 20 includes a drive unit 30 fixed to a vehicle body panel (not shown) forming the vehicle body 11 and adjacent to the longitudinal central 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 in the longitudinal direction of the guide rail 14, a closing cable 23 for pulling the sliding door 13 in the closing direction (front of the vehicle body), and a sliding door. and an opening cable 24 for pulling the door 13 in the opening direction (rear 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.

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

As a result, the drive unit 30 is driven in the normal direction, so that the closing 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 reverse, the opening 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 that are arranged outside the vehicle body 11 are hidden by a guide groove (not shown) provided inside the guide rail 14 . Thereby, the pair of cables 23 and 24 are not exposed to the outside. Therefore, the pair of cables 23 and 24 can be protected from rainwater, dust, etc. while improving the appearance of the vehicle 10 .

Between the pair of reversing pulleys 21 and 22 and the drive unit 30, there are outer casings 25 and 26 that cover the pair of cables 23 and 24 and slidably hold the pair of cables 23 and 24, respectively. is provided. These outer casings 25 and 26 are flexible and the inside thereof is coated with sliding grease (not shown). Thereby, the pair of cables 23 and 24 can be protected, and the pair of cables 23 and 24 can slide smoothly with respect to the pair of outer casings 25 and 26 .

As shown in FIGS. 3-5, the drive unit 30 includes a motor section 40, a substrate housing section 50 and a drum housing section 60, which are fastened together by a plurality of fastening members FN (only three are shown in the drawings). integrated with each other. Among the motor section 40, the substrate housing section 50, and the drum housing section 60, the drum housing section 60 is the largest portion. 40 and the substrate accommodating portion 50 are substantially within the projection range of the drum accommodating portion 60 respectively.

In this manner, the motor section 40 and the substrate housing section 50 are arranged to substantially enter the projection range of the drum housing section 60, and the motor section 40 and the substrate housing section 50 are moved in directions perpendicular to the axial direction of the rotation shaft 46, respectively. By arranging them side by side, the thickness dimension along the axial direction of the rotating shaft 46 of the drive unit 30 is suppressed from increasing.

The motor unit 40 includes a motor housing 41 made of a resin material such as plastic, and a flat motor cover 42 that closes an opening 41 a of the motor housing 41 . The motor cover 42 is also made of a resin material such as plastic, thereby reducing the weight of the motor section 40 .

The motor housing 41 is formed in a flat, substantially cylindrical shape, and accommodates a flat electric motor 43 therein. The electric motor 43 is a brushless motor and includes a stator 44 formed in an annular shape and a rotor 45 that rotates radially inside the stator 44 .

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

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

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

Specifically, a boss portion 41 b that is thicker than the 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 are mounted on the radially inner side of the boss portion 41b. The large-diameter shaft portion 46a of the rotary shaft 46 is rotatably supported by these large-diameter ball bearings B1. The pair of large-diameter ball bearings B1 are provided on both axial sides of the boss portion 41b so as to be spaced apart from each other. As a result, the rotary shaft 46 can rotate stably at high speed without shaking.

The substrate accommodation portion 50 is provided close to the motor portion 40 , and a control substrate 51 for controlling the rotation state of the electric motor 43 is accommodated inside the substrate accommodation portion 50 . On the control board 51, a switching element 51a is mounted for supplying a drive current at a high speed to each of the U-phase, V-phase, and W-phase coils 44b forming the electric motor 43 one after another.

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. Thereby, the drive current from the external connector is supplied to the drive unit 30 .

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

Further, the control board 51 is mounted with a CPU (not shown) to which pulse signals are input from the plurality of Hall ICs 51c. This enables the CPU to grasp the rotational state (rotational speed, rotational direction, etc.) of the rotor 45 and optimally control the switching element 51a. Therefore, the rotation state of the electric motor 43 is controlled with high accuracy. Note that other electronic components EP such as capacitors are also mounted on the control board 51, as shown in FIG.

Further, a part (details not shown) of the housing 52 forming the outer shell of the board accommodating portion 50 is made of an aluminum material or the like having high thermal conductivity. As a result, the heat of the switching element 51a, which becomes hot during 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 drum cover 62 that closes an opening 61 a of the drum housing 61 . The drum cover 62 is also made of a resin material such as plastic, thereby reducing the weight of the drum accommodating portion 60 .

The drum housing 61 is formed in a flat, substantially daruma shape, and includes a bottom wall portion 61b and side wall portions 61c provided upright around the bottom wall portion 61b. Inside the drum housing 61, the closing drum 70, the opening drum 80, and the direction changing pulley 63 are rotatably accommodated. Here, the closing drum 70, the opening drum 80, and the direction change pulley 63 are all made of a resin material such as plastic. I am planning.

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

Further, the opening-side drum 80 is provided side by side with the direction changing pulley 63 in a portion of the drum housing 61 near the board accommodating 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. A line segment connecting these axes C1, C2, and C3 forms a substantially equilateral triangle. An opening cable 24 for pulling the slide door 13 in the opening direction is wound around the opening drum 80 .

As shown in FIG. 4, a through hole 71 is provided at the center of rotation of the closing drum 70 and extends through the closing drum 70 in the axial direction. A ball bearing B2 is installed. A small-diameter ball bearing B<b>2 on one axial side (motor unit 40 side) of the closing drum 70 is mounted on the small-diameter shaft portion 46 c of the rotating shaft 46 . On the other hand, the small-diameter ball bearing B2 on the other side of the closing drum 70 in the axial direction (the side opposite to the motor section 40 side) is mounted on a first support projection 62a integrally provided inside the drum cover 62. . As a result, the closing drum 70 can be smoothly rotated around the axis C1. That is, the closing drum 70 is rotatably supported by the small-diameter shaft portion 46c and the first support protrusion 62a.

As shown in FIG. 5, a through-hole 81 is provided at the center of rotation of the opening-side drum 80 so as to pass through the opening-side drum 80 in the axial direction. A ball bearing B3 is installed. A small-diameter ball bearing B3 on one axial side (motor section 40 side) of the opening drum 80 is mounted on a first support pin N1 integrally provided on the bottom wall section 61b. On the other hand, the small-diameter ball bearing B3 on the other side of the closing drum 80 in the axial direction (the side opposite to the motor section 40 side) is mounted on a second support projection 62b integrally provided inside the drum cover 62. . As a result, the opening-side drum 80 can be smoothly rotated about the axis C2. That is, the opening side drum 80 is rotatably supported by the first support pin N1 and the second support protrusion 62b.

As shown in FIG. 3, the direction change pulley 63 changes the direction of the closing cable 23 drawn into the drum housing 61 toward the closing drum 70. It is rotatably supported by a second support pin N2 provided integrally with 61b. A more detailed structure of the closing side drum 70 and the opening side drum 80 and the 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 closed side cable guide portion 64 and an open side cable guide portion 65. As shown in FIG. These cable guide portions 64 and 65 have the function of guiding the closing side cable 23 and the opening side cable 24 inside the drum housing 61, and are each 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 opening-side cable guide portion 65 is arranged near the opening-side drum 80 and guides the opening-side cable 24 from the motor portion 40 side toward the opening-side drum 80 .

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 . As a result, minute slack in the pair of cables 23 and 24 that has stretched over time can be absorbed outside the drum housing 61 .

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

As shown in FIG. 4, the closing drum 70 is arranged coaxially with the electric motor 43 and 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 rotational torque of the closing drum 70 . .

The speed reduction mechanism 100 is a planetary gear speed reducer, and includes a sun gear 46b provided integrally with the rotating shaft 46, and three planetary gears 101 (illustrated in the figure) meshing with the sun gear 46b and provided to rotate freely around the sun gear 46b. only two are shown), an outer gear 102 provided around the planetary gear 101 and meshed with the planetary gear 101, and a planetary carrier 103 that holds the three planetary gears 101 and rotates according to the orbital motion of the planetary gear 101. , is equipped with

More specifically, the outer gear 102 is annularly formed and sandwiched between the motor housing 41 and the drum housing 61 . That is, the outer gear 102 is firmly fixed to the respective housings 41 and 61 so as not to rotate. Further, the planetary carrier 103 transmits a rotational force to the closing side drum 70, and the planetary carrier 103 is connected to the closing side drum 70 so as to be integrally rotatable.

A small-diameter ball bearing B4 is attached to the radially inner side of the planetary carrier 103, and the small-diameter ball bearing B4 is attached to the small-diameter shaft portion 46c of the rotating shaft 46. As shown in FIG. As a result, the planetary carrier 103 can smoothly rotate relative to the rotating shaft 46 .

To describe the operation of the reduction mechanism 100, first, the rotating 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 rotating 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. At this time, the revolution speed of the planetary gear 101 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 with a high torque, and the closing 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 driving belt 90 are accommodated in the arrangement relationship shown in FIG. 6(a) and the upper side of FIG. 6(b) are the axial sides of the respective drums 70 and 80, which face the motor section 40. . On the other hand, the upper side in FIG. 6A and the lower side in FIG.

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

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

The three engaging claws 72b are provided at regular intervals (at intervals of 120 degrees) in the circumferential direction of the closing drum 70 and protrude in the axial direction of the closing drum 70 . These engaging claws 72b are adapted to be hooked on the planetary carrier 103 (see FIG. 4) of the speed reduction mechanism 100. As shown in FIG. Thereby, the rotational force of the planetary 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 of the closing-side drum 70 in the axial direction and closer to the drum cover 62 than the closing-side power transmission portion 72 (upper side in FIG. 7). there is A spiral small-diameter cable groove 73 a is provided in the small-diameter portion 73 , and the winding diameter of the closing-side cable 23 wound around the small-diameter cable groove 73 a is D1→D2→D3 toward the closing-side power transmission portion 72 . and gradually decreases (D1>D2>D3).

A large-diameter portion 74 around which the closing-side cable 23 is wound is provided on the other axial side (drum cover 62 side) of the closing-side drum 70 . 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 closing-side cable 23 wound around the large-diameter cable groove 74a is a constant D4 over the entire area of the large-diameter cable groove 74a.

The winding diameter D4 of the large-diameter cable groove 74a is larger than the winding diameter D1 at 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 of the closing drum 70 along the axial direction. That is, the large-diameter cable groove 74a and the small-diameter cable groove 73a form one continuous spiral cable groove.

The end of the closing cable 23 wound around the closing drum 70 is fixed to the other side of the closing drum 70 in the axial direction, that is, to 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 end of the winding 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 where the winding diameter is D3, which is the smallest. .

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

On the other hand, the winding diameter of the small-diameter cable groove 73a gradually decreases in the order of D1→D2→D3 toward the closed-side power transmission portion 72. As shown in FIG. Therefore, in the partition wall 74b having the same groove pitch P1 and the same thickness T1 as the large-diameter cable groove 74a, there is a possibility that the closed-side cable 23 may fall out of the small-diameter cable groove 73a as the closed-side cable 23 is wound thereon. 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). As a result, a relatively thick partition wall 73b having a thickness of T2 (approximately 5.0 mm) is provided between adjacent small-diameter cable grooves 73a (T2>T1).

Thus, by increasing the thickness dimension of the partition 73b to T2, the rigidity of the partition 73b is sufficiently enhanced. Therefore, it is possible to increase the height dimension H of the partition wall 73b (increase the depth dimension of the small-diameter cable groove 73a). ing.

Furthermore, as shown in FIG. 4, a portion of the drum housing 61 provided around the closing drum 70 is inclined along the contour of the portion of the closing 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.

Thus, the winding start of the closing cable 23 on the closing drum 70 is the large diameter cable groove 74a, and the winding end of the closing cable 23 on the closing drum 70 is the small diameter cable groove 73a. Therefore, without controlling the rotational speed of the electric motor 43, the slide door 13 can be moved quickly at the start of closing and slowly moved just before the end of closing. In other words, 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 in the present invention and has a shape as shown in FIGS. The open side drum 80 is made of a resin material such as plastic and has a substantially disk shape, and a through hole 81 is formed at the center of rotation thereof to receive a pair of small-diameter ball bearings B3 (see FIG. 5).

An opening side power transmission portion 82 is provided at one axial end (lower side in FIG. 8) of the opening side drum 80 . The opening-side power transmission portion 82 includes an opening-side belt engaging portion 82a. The open-side belt engaging portion 82a has a plurality of irregularities (not shown in detail), and the rubber teeth 91 of the drive belt 90 are engaged with the open-side belt engaging portion 82a. Since the opening drum 80 is driven by the closing drum 70 via the drive belt 90, it does not have the engaging claws 72b (see FIG. 7) provided on the closing drum 70. As shown in FIG.

A large-diameter portion 83 around which the opening-side cable 24 is wound is provided on one side of the opening-side drum 80 in the axial direction and closer to the drum cover 62 than the opening-side power transmission portion 82 (upper side in FIG. 8). ing. A spiral large-diameter cable groove 83a is provided in the large-diameter portion 83, and the winding diameter of the opening-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 dimension of the portion 83. As shown in FIG.

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

The winding diameter d1 of the large-diameter cable groove 83a is larger than the winding diameter d2 at 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 opening drum 80. As shown in FIG. That is, the large-diameter cable groove 83a and the small-diameter cable groove 84a form one continuous spiral cable groove.

The end of the open side cable 24 wound around the open side drum 80 is fixed to the other side of the open side drum 80 in the axial direction, that is, to the small diameter portion 84 side. That is, as the opening-side cable 24 is wound around the opening-side drum 80, the opening-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 the winding of the opening side cable 24 (when the slide door 13 is substantially fully opened), the opening 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 opening-side cable 24 is wound around, the opening-side cable 24 is less likely to drop out of the large-diameter cable groove 83a. Therefore, the groove pitch p1 of the large-diameter cable groove 83a is reduced as much as possible, thereby suppressing an increase in the axial dimension of the opening side drum 80. FIG. More specifically, a partition 83b having a thickness of about t1 (approximately 1.0 mm) is provided between adjacent large-diameter cable grooves 83a.

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

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

By thus increasing the thickness dimension of the partition 84b to t2, the rigidity of the partition 84b is sufficiently increased. Therefore, it is possible to increase the height dimension h of the partition wall 84b (increase the depth dimension of the small-diameter cable groove 84a). ing.

Furthermore, as shown in FIG. 5 , a portion of the drum cover 62 provided to cover the opening side drum 80 is inclined along the contour shape of the portion of the opening side drum 80 where the small diameter portion 84 is provided. A sloped portion 62c is provided. The inclined portion 62c faces the tip portion of the partition wall 84b, which also reliably prevents the opening-side cable 24 from falling out of the small-diameter cable groove 84a.

As shown in the hatched portion of FIG. 6, a drive belt 90 is provided between the closing drum 70 and the opening drum 80 to transmit the driving force of the closing drum 70 to the opening drum 80. . The drive belt 90 is formed in an annular shape from a flexible elastic material such as natural rubber. Rubber teeth 91 are integrally provided.

Here, although not shown, a reinforcing member (for example, glass fiber, carbon fiber, etc.) is embedded inside the drive belt 90 to prevent the drive belt 90 from being stretched under high load. As a result, the driving force of the closing drum 70 is efficiently transmitted to the opening drum 80 , thereby preventing a rotation difference between the closing drum 70 and the opening drum 80 .

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

Specifically, at the timing when the closing-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 closing-side drum 70, the opening-side cable 24 (see FIG. 3) is 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 sliding door 13 is positioned at a predetermined position with respect to the opening 12, that is, at the substantially central portion of the path between the fully closed position and the fully open position of the sliding door 13 and the position at which the opening 12 is fully closed. is moved between

On the other hand, at the timing when the opening side cable 24 is wound around the large diameter cable groove 83 a (see FIG. 8) in the large diameter portion 83 of the opening side drum 80 , the closing side cable 23 is wound in the large diameter portion 74 of the closing side drum 70 . It is wrapped around the diameter cable groove 74a (see FIG. 7) (state B). In this "state B", the sliding door 13 is positioned 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 sliding door 13, and a position at which the opening 12 is fully opened. is 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. 9(a) is a diagram showing a [fully open state] in which the opening side cable is wound around the opening side drum, and (b) is a diagram showing a [fully closed state] in which the closing side cable is wound around the closing side drum. 10 is an explanatory diagram explaining the change in the cable length, FIG. 11 is a graph explaining the change in the cable length, and FIG. 12 is a graph 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.

When the operator "closes" an operation switch (not shown), the electric motor 43 (see FIG. 4) is driven to rotate forward. Then, as shown in FIG. 9(a), the closing drum 70 is rotationally driven in the arrow "close" direction 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 from 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 sliding door 13 moves in the closing direction.

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

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

In this way, the change in cable length of the closing side cable 23 and the opening side cable 24 is suppressed during the operation of the drive unit 30, so the drive unit 30 does not have a tensioner mechanism, which is a relatively large component. As shown in FIG. 3, the closed side cable guide portion 64 and the open side cable guide portion 65 are each provided with a coil spring SP. It removes minute slack in the cables 23 and 24, and is a sufficiently small component compared to the tensioner mechanism described above.

Here, the sliding door 13 is pulled into the vehicle body 11 just before it is fully closed (see FIG. 2). Accordingly, 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-side cable 23 in particular is pulled radially outwardly of the curved portion 14a as indicated by the dashed arrow L. That is, the closing-side cable 23 is connected when the slide door 13 (roller assembly 15) is closer to the fully closed position than when the slide door 13 (roller assembly 15) is closer to the fully open position (broken line portion in the figure). In some cases (indicated by the solid line in the figure), more is delivered 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 position "1" (on the rear side of the vehicle body) of the guide rail 14, the length of the cable is The amount of change is -2 mm. Further, when the slide door 13 is in the fully closed state, that is, when the roller assembly 15 is at position "2" (on the front side of the vehicle body) of the guide rail 14, the amount of change in the cable length is 0 mm. Therefore, when the slide door 13 is fully open, the amount of change in the 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 in the fully closed position and about 80 mm behind the vehicle body from the [fully closed state], that is, when the roller assembly 15 is positioned at "3" of the guide rail 14 (curved portion 14a), the amount of change in the cable length is the largest, about 12 mm. Since the amount of change (variation) in the cable length of the closed side cable 23 at this time is relatively large, it is impossible to absorb it only by the function of the coil spring SP provided in the closed side cable guide portion 64 . Therefore, the winding diameters of the small-diameter portion 73 of the closing drum 70 are set small as D2 and D3 (see FIG. 7) so that the change in the cable length is absorbed at these portions.

More specifically, the winding diameters (diameter dimensions) D2 and D3 of the small diameter portion 73 of the closing drum 70 are larger than the winding diameters (diameter dimensions) d3 and d4 (diameter dimensions) 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 feed amount of the closing cable 23 from the closing drum 70 that occurs during the movement of the sliding door 13 (increase of about 12 mm). Sized to absorb. Specifically, the timing at which the small diameter portion 73 absorbs the change in the feed amount of the closing cable 23 from the closing drum 70 (increase of about 12 mm) is the above-described "state A". be. In other words, when the sliding door 13 moves between the substantially central portion of the path between the fully closed position and the fully open position and the position where the opening 12 is fully closed, the small diameter portion 73 is the closed side cable 23. It is designed to absorb the change in the feed amount from the closing drum 70 (increase of about 12 mm). 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 feed amount of the closing-side cable 23 from the closing-side drum 70 (an increase of about 12 mm). It's becoming

As a result, the small diameter portion 73 of the closing drum 70 can absorb a relatively large change in the cable length (approximately 12 mm increase) that occurs during the movement of the slide door 13 . Therefore, even if the tensioner mechanism as described above is not specially provided, the operation of the drive unit 30 becomes dull due to an increase in resistance when the slide door 13 moves toward the fully closed side, and the slide door 13 rattles. Sticking can be effectively suppressed.

After that, as the drive unit 30 continues to close, the slide door 13 is further pulled into the vehicle body 11 . Ultimately, 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 to lock the slide door 13. 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 generates a relatively large cable pulling force [N] when moving the slide door 13 to the fully closed position. Note that the dashed line graph in FIG. 12 indicates the characteristics of the drive unit (not shown) of the comparative example. In addition, in the drive unit of the comparative example, a drum in which the cable winding diameter is the same size over the entire range (a drum in which the cable winding diameter does not change) is used.

As shown in the solid line graph (invention) of FIG. 12, when the roller assembly 15 moves on the guide rail 14 and is at the position "a" where it reaches the curved portion 14a, the force is as large as about 600 N in the present invention. Generates cable pulling force. 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 more than when the roller assembly 15 passes through the straight portion of the guide rail 14. As shown in FIG. In the present invention, since the closing side cable 23 is pulled by a large cable pulling force (approximately 600 N), the slide door 13 can be moved smoothly just before the slide door 13 is fully closed. On the other hand, in the comparative example, the cable is pulled by a cable pulling force of about 400 N, which is smaller than that of the present invention.

Further, when the roller assembly 15 moves on the guide rail 14 and is at the position "b" after passing through the curved portion 14a, that is, when the slide door 13 is in the locked state (the door locker and the door striker are engaged). In the present invention, a large cable pulling force of about 600 N is generated even when it is in a position where it is in a state of being closed. This is because, similarly to the above, the winding diameter of the small diameter portion 73 of the closing drum 70 is set to small diameters such as D2 and D3 (see FIG. 7).

Therefore, the drive unit 30 of the present invention also has a door closer function that requires a large driving force, thus eliminating the need to provide a separate door closer device to the vehicle body 11 . On the other hand, in the comparative example, when the sliding door is in the locked state, the cable can only be pulled with a cable pulling force of about 400N, which is smaller than that of the present invention. Therefore, in the comparative example, there is no margin in the pulling force for locking the sliding door, 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 way to stably output a 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 not sufficient for the closing side drum 70 which needs to be driven with high torque as described above. This is also due to the fact that the electric motor 43 is coaxially arranged (see FIG. 4) so that the drive torque of the electric motor 43 can be transmitted to the closing drum 70 with high efficiency.

[When opening the sliding door]
When the operator "opens" the operation switch, the electric motor 43 is reversely driven. Then, as shown in FIG. 9(b), the opening drum 80 is rotationally driven in the direction of the arrow "open" via the driving belt 90. As shown in FIG. As a result, the opening-side cable 24 is gradually wound from the small-diameter cable groove 84a of the opening-side drum 80 to the large-diameter cable groove 83a (see FIG. 8). Therefore, the roller assembly 15 (see FIG. 2) is pulled rearward 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 a state in which it is 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 drum 70 is rotationally driven in the direction of the arrow "open", whereby the closing cable 23 is pulled by the roller assembly 15 and the closing drum 70 is rotationally driven. , is delivered to the outside 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 manner, when the slide door 13 is opened, the operation is reversed compared to the above-described [when the slide door is closed]. It should be noted that when the slide door 13 is opened, a large cable pulling force is not required as compared to when the slide door 13 is closed and locked. Therefore, even with the driving torque of the opening side drum 80 via the driving belt 90, the sliding door 13 can be sufficiently opened without the driving belt 90 being stretched or detached.

As described in detail above, according to the drive unit 30 according to the present embodiment, the closing side cable 23 for pulling the sliding door 13 in the closing direction and the closing side cable 23 are wound around, and the small diameter one side in the axial direction is wound. and a closing side drum 70 having a portion 73 and a large diameter portion 74 on the other side in the axial direction. It is sized to absorb the change in the feed amount from the closing drum 70 (increase of about 12 mm).

As a result, the small-diameter portion 73 of the closing drum 70 can absorb the change in the feeding amount of the closing cable 23 from the closing drum 70 (increase of about 12 mm) that occurs during the movement of the sliding door 13. It is possible to do away with a conventional large tensioner mechanism consisting of a plurality of parts. Therefore, the drive unit 30 can be made smaller and lighter.

Further, according to the drive unit 30 according to 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. The axial dimension of the drum can be reduced compared to the case where two cables are respectively 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 (downsized) than the conventional one.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the closing drum 70 corresponding to the closing cable 23 and the opening drum 80 corresponding to the opening cable 24 are separately provided, but the present invention is similar to this. However, it is also possible to adopt the same drive unit as before, in which the closing cable 23 and the opening cable 24 are wound around one drum in opposite directions.

Further, in the above-described embodiment, the electric motor 43 is a three-phase brushless motor, but the present invention is not limited to this, and an electric motor with other specifications such as an electric motor with a brush may be used. can be

Furthermore, in the above-described embodiment, the drive belt 90 is made of natural rubber or the like, but the present invention is not limited to this. If available, other specifications such as a metal chain may be adopted.

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

10 Vehicle 11 Car Body 12 Opening 13 Slide Door (Opening and Closing Body)
14 guide rail 14a curved portion 15 roller assembly (moving member)
20 slide door opening/closing mechanism 21, 22 reversing pulley 23 closing side cable (cable, first cable)
24 open side cable (second cable)
25, 26 outer casing 30 drive unit 40 motor section 41 motor housing 41a opening 41b boss section 42 motor cover 43 electric motor 44 stator 44a stator core 44b coil 45 rotor 45a rotor main body 45b permanent magnet 46 rotating shaft 46a large diameter shaft section 46b sun gear 46c Small-diameter shaft portion 50 Substrate housing portion 51 Control substrate 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 projection 62b second supporting projection 62c inclined portion 63 direction change pulley 64 closing side cable guide Part 65 Opening side cable guide part 70 Closing side drum (drum, first drum)
71 through hole 72 closing side power transmission portion 72a closing side belt engaging portion 72b engaging claw 73 small diameter portion 73a small diameter cable groove 73b partition wall 74 large diameter portion 74a large diameter cable groove 74b partition wall 80 opening side drum (second drum)
81 through hole 82 open side power transmission portion 82a open side belt engaging portion 83 large diameter portion 83a large diameter cable groove 83b partition wall 84 small diameter portion 84a small diameter cable groove 84b partition wall 90 drive belt 91 rubber tooth 100 reduction mechanism 101 planetary gear 102 outer gear 103 Planetary 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 that drives an opening/closing body that opens and closes an opening,
a first cable and a second cable for pulling the opening/closing body;
a first drum around which the first cable is wound, 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;
a second drum around which the second cable is wound and which has a large diameter portion on one side in the axial direction and a small diameter portion on the other side in the axial direction;
has
The axis of the first drum and the axis of the second drum are provided parallel to each other,
The winding diameter of the small-diameter portion of the first drum is sized to absorb a change in the feed amount of the first cable from the first drum that occurs during the movement process of the opening/closing body.
drive unit. A drive unit according to claim 1, wherein
The first cable wound around the first drum pulls the opening/closing body in a closing direction,
the second cable wound around the second drum pulls the opening/closing body in the opening direction,
In a state in which 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 at a predetermined position in the opening. moving between a position where the opening is fully closed;
In a state where 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 positioned at a predetermined position in the opening. and a position where the opening is fully opened,
The winding diameter of the small-diameter portion of the first drum is 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 the change in the amount of delivery from
drive unit. A drive unit according to claim 2, wherein
The opening and 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 curves toward the interior of the vehicle on the front side of the vehicle body,
The first cable is connected to one side of the moving member in the moving direction,
The second cable is connected to the other side of the moving member in the moving direction,
The winding diameter of the small-diameter portion of the first drum is large enough to absorb a change in the feed amount of the first cable from the first drum when the moving member passes through the curved portion.
drive unit. A 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 size,
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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