Vehicle door opening and closing mechanism

Abstract

To improve getting on / off performance at a vehicle entrance in a vehicle door opening / closing mechanism.SOLUTION: A vehicle door opening / closing mechanism 10 is configured to guide a vehicle door 3 in a movable manner between a closed position in which a vehicle entrance is closed and an open position in which the door is opened. The opening / closing mechanism 10 includes: a hinge arm 12 whose one end is rotatably supported by a vehicle body-side rotating shaft 5 of a vehicle, whose the other end is rotatably supported by a door-side rotating shaft 6, and which is provided with a drive arm 13 to extend from the other end; and a telescopic drive unit 31 which has a unit case 32 which is arranged inside the door to be rotatably supported by a support shaft 59 whose one end is fixed to the door and a telescopic movement part 40 which goes in and out of the unit case 32 and whose tip is rotatably fixed to a tip of the drive arm 13. The telescopic drive unit 31 drives the telescopic movement part 40 in and out of the unit case 32 by a drive motor and a power direction changing mechanism.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a vehicle door opening and closing mechanism that is guided movably between a closed position that closes the vehicle entrance and an open position that opens the door, and in particular to improving ease of entry and exit at a vehicle entrance. [Background technology]

[0002] Patent Document 1 describes a glide door device (vehicle door opening / closing mechanism) that includes a link mechanism driven via a gear device by a motor fixed to the vehicle body, and opens and closes a vehicle door by rotation of a drive link of the link mechanism. In this device, a motor gear device including a motor and a gear device is fixed near the vehicle entrance. When the motor rotates, the drive link of the link mechanism connected to the output shaft of the gear device rotates about a rotation axis fixed to the vehicle body, thereby opening and closing the door. When the vehicle door is opened, the vehicle door is pushed outward and then moves in parallel to one side in the vehicle front-rear direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 61-196084 Summary of the Invention [Problem to be solved by the invention]

[0004] When opening and closing a vehicle entrance while guiding a vehicle door so as to be movable in a parallel manner, a motor gear device fixed to the vehicle body as in Patent Document 1 may be used to rotate a drive link rotatably supported by the vehicle body and the door. However, in this case, even when the door is open, a large motor gear device serving as a power source for opening and closing the door is disposed near the vehicle entrance. As a result, the motor gear device gets in the way of people getting on and off the vehicle.

[0005] The object of the present invention is to improve ease of entry and exit at a vehicle entrance in a vehicle door opening and closing mechanism that is guided movably between a closed position that closes the vehicle entrance and an open position that opens the door. [Means for solving the problem]

[0006] The vehicle door opening / closing mechanism of the present invention is a vehicle door opening / closing mechanism that is guided to be movable between a closed position in which a vehicle entrance / exit is closed and an open position in which the door is opened, and includes: a hinge arm having one end rotatably supported by a vehicle body-side rotating shaft and the other end rotatably supported by a door-side rotating shaft of the door, and a drive arm extending from the other end; a unit case that is disposed inside the door and has one end rotatably supported by a support shaft fixed to the door; and a telescopic drive unit that has an extendable movable part that moves in and out of the other end of the unit case along a case axis and has a tip that is rotatably fixed to the tip of the drive arm, wherein the telescopic drive unit has a drive motor fixed within the unit case, and a power direction conversion mechanism that converts power in a rotational direction based on the drive force into power in a direction along the case axis so that the telescopic movable part is driven in and out of the unit case by the drive force of the drive motor. Effect of the Invention

[0007] According to the vehicle door opening / closing mechanism of the present invention, the telescopic drive unit is provided in the door as a power source for opening and closing the door. This eliminates the need to fix a power source for opening and closing the door near the vehicle entrance. This eliminates the need for a power source to be located near the vehicle entrance when the door is open, improving ease of entry and exit at the vehicle entrance. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing an example of a vehicle to which a door opening and closing mechanism according to an embodiment of the present invention is applied; [Diagram 2] 4 is a schematic diagram showing a positional relationship between a door and a vehicle entrance / exit when the door is closed, as viewed from inside the vehicle in an embodiment. FIG. [Diagram 3] 4 is a schematic diagram showing the positional relationship between a door and a vehicle entrance / exit when the door is open, as viewed from inside the vehicle in an embodiment. FIG. [Figure 4A] 3 is a cross-sectional view taken along line AA in FIG. 2, illustrating the relationship between the door and the vehicle body and their connecting portion when the door is closed in the embodiment. [Figure 4B] 4 is a cross-sectional view taken along line BB in FIG. 3, illustrating the relationship between the door and the vehicle body and their connecting portion when the door is open in the embodiment. [Diagram 5] FIG. 4 is a cross-sectional view showing an example of an extension drive unit constituting a door opening and closing mechanism in an embodiment. [Figure 6] 6 is a perspective view partially showing an example of a speed reducing mechanism constituting the telescopic drive unit of FIG. 5. [Figure 7] 5A to 5C are schematic diagrams illustrating the operation of a door opening and closing mechanism in the embodiment. [Figure 8] FIG. 4B is a view corresponding to FIG. 4A, showing an embodiment using an alternative hinge arm. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a vehicle door opening / closing mechanism according to an embodiment of the present invention will be described. In this description, the specific shape, number, arrangement position, direction, etc. are examples for facilitating understanding of the present invention, and can be appropriately changed according to specifications. Below, a case where the vehicle door opening / closing mechanism is applied to a bus-type vehicle will be described, but it can be applied to various types of vehicles to which a moving vehicle door can be attached. In addition, the arrows F, U, and R shown in each figure indicate the forward, upward, and rightward directions of the vehicle, respectively. In addition, the opposite directions of each of the arrows F, U, and R respectively indicate the backward, downward, and leftward directions of the vehicle.

[0010] Fig. 1 shows a vehicle 1 to which the door opening and closing mechanism of the embodiment is applied. Fig. 2 and Fig. 3 are schematic diagrams of the positional relationship between a vehicle door 3 and a vehicle entrance / exit 4 when the door is closed and when the door is open, respectively, as viewed from inside the vehicle. The vehicle of this embodiment shows a right-hand traffic vehicle, but the basic configuration is the same for left-hand traffic vehicles, except that the left and right are reversed.

[0011] In a bus-type vehicle 1, which is a shared-ride vehicle, a vehicle entrance 4 where passengers can get on and off is provided on one side of a vehicle body 2. The vehicle entrance 4 is opened and closed by a vehicle door 3. A vehicle door opening and closing mechanism 10 shown in Figs. 2 and 3 opens and closes the vehicle door 3 while guiding the vehicle door 3 so as to be movable in parallel.

[0012] During opening and closing operations, the vehicle door 3 is guided by an opening and closing mechanism 10 so as to be movable in parallel between a closed position in which the vehicle entrance 4 is closed as shown in Fig. 2 and an open position in which the vehicle door 3 is open as shown in Fig. 3. The opening and closing mechanism 10 includes a hinge arm 12, an auxiliary link 90, and a telescopic drive unit 31. The hinge arm 12 corresponds to a drive link that forms a parallel link together with the auxiliary link 90 as described later. The telescopic drive unit 31 rotates the hinge arm 12 as described later.

[0013] 2 and 3, one end of the hinge arm 12 is rotatably supported by a vehicle body side rotation shaft 5 located at the bottom of the vehicle body 2. The other end of the hinge arm 12 is rotatably supported by a door side rotation shaft 6 located at the bottom of the vehicle door 3. The vehicle body side rotation shaft 5 and the door side rotation shaft 6 each extend along the vertical direction.

[0014] One end of the auxiliary link 90 is rotatably supported by the vehicle body side rotating shaft 7 located at the upper part of the vehicle body. The other end of the auxiliary link 90 is rotatably supported by the door side rotating shaft 8 located at the upper part of the vehicle door 3. As in the case of the hinge arm 12, each of the vehicle body side rotating shaft 7 and the door side rotating shaft 8 is aligned in the vertical direction.

[0015] 4A and 4B are views corresponding to the AA cross section in FIG. 2 and the BB cross section in FIG. 3, respectively, showing the relationship between the vehicle door 3, the vehicle body 2, and their connecting portion when the door is closed and when the door is opened in the embodiment. As shown in FIG. 4A and FIG. 4B, the linear lengths L1 and L2 (FIG. 4A) from the vehicle body side rotation shafts 5 and 7 to the door side rotation shafts 6 and 8 in the hinge arm 12 and the auxiliary link 90 are the same. As a result, the hinge arm 12 and the auxiliary link 90 form a parallel link that guides the vehicle door 3 to be able to move in parallel.

[0016] 4A and 4B, the cross-sectional shapes of the upper part of the vehicle door 3 and the auxiliary link 90 are indicated by two-dot chain lines. In the vehicle door 3, the height position at which the hinge arm 12 is rotatably supported and the height position at which the auxiliary link 90 is rotatably supported are different from each other, and the positions of the vehicle door 3 in the vehicle width direction at each height position are also different from each other. Specifically, in the vehicle door 3, the lower position supporting the hinge arm 12 protrudes outward in the vehicle width direction from the upper position supporting the auxiliary link 90. ​​The vertical positional relationship between the hinge arm 12 and the auxiliary link 90 may be reversed.

[0017] A drive arm 13 is integrally extended from the other end side (the left end side in FIG. 4A, the upper end side in FIG. 4B) of the hinge arm 12. A tip end of a telescopic movable shaft 40 of a telescopic drive unit 31 described later is rotatably fixed to a tip end of the drive arm 13. As a result, by movement of the telescopic movable shaft 40, the hinge arm 12 rotates about the vehicle body side rotation shaft 5, as described in detail later.

[0018] 5 is a cross-sectional view showing the telescopic drive unit 31. The telescopic drive unit 31 has a unit case 32 that is disposed inside the vehicle door 3 along the approximately front-rear direction of the vehicle door 3 and is capable of slight rotation around one end (the right end in FIG. 5) and a telescopic movable shaft 40 that enters and exits from the unit case 32. The telescopic movable shaft 40 corresponds to the telescopic drive section. The front-rear direction of the vehicle door 3 coincides with the front-rear direction of the vehicle 1 when the vehicle door 3 is in the closed position as shown in FIG. 4A.

[0019] The unit case 32 is long and cylindrical with a bottom 33 at one end, and has a one-end extension 34 that extends in the case axial direction from the outer end of the bottom 33 provided at one end (the right end in FIG. 5) of the case axial direction and has a rotation support part 35 at its tip. One end of the one-end extension 34 is rotatably supported by a support shaft 59 (FIGS. 4A and 4B) fixed to the vehicle door 3. The case axis of the unit case 32 passes through the rotation center of the rotation support part 35 at one end and the rotation center of a rotation support part 43 (described later) at the other end of the telescopic movable shaft 40 arranged inside the unit case 32.

[0020] The telescopic movable shaft 40 has a long cylindrical portion 41 having a bottom portion 41a at the other end (the left end in FIG. 5) that is fitted inside the unit case 32 so as to be movable along the case axis, and a nut member 45 fixed to one end of the cylindrical portion 41. The outer end of the bottom portion 41a is formed with an other-end extension portion 42 that extends in the axial direction and has a rotation support portion 43 at its other end, which is the tip. The telescopic movable shaft 40 enters and exits the other end of the unit case 32 along the case axis, and its other end is fixed to the tip of the drive arm 13 so as to be rotatable about a vertical arm-side rotation shaft 60 (FIG. 4A) provided at the tip.

[0021] The nut member 45 has a female thread portion 46 on its inner circumference, and a male thread portion 62 of a screw shaft 61 described below screws into the female thread portion 46. The telescopic movable shaft 40 is prevented from rotating relative to the unit case 32. As described below, the screw shaft 61 rotates, causing the telescopic movable shaft 40 including the nut member 45 to move in the case axial direction. The nut member 45 and the screw shaft 61 form a nut screw moving mechanism 63, which is a power direction conversion mechanism.

[0022] The telescopic drive unit 31 further has a drive motor 64 fixed to one end inside the unit case 32, and a reduction mechanism 66. The drive motor 64 has a motor shaft (not shown) that is rotatable along the case axis, and is connected by a power line to a power source unit (not shown) including a battery provided on the vehicle body 2 side, and rotates the motor shaft by receiving power from the battery. The drive motor 64 is, for example, a three-phase AC motor or a DC motor.

[0023] The reduction mechanism 66 has an input shaft that rotates when driven by the drive motor 64, a gear mechanism, and an output shaft, and outputs the power of the input shaft to the output shaft after being reduced in speed by the gear mechanism. The reduction mechanism 66 includes a multi-stage planetary gear unit as described later, and reduces the speed in multiple stages. As a result, although the reduction mechanism 66 is longer in the axial direction, the outer diameter of each planetary gear unit can be reduced while increasing the deceleration, so that the outer diameter of the telescopic drive unit 31 can be prevented from becoming excessively large. The reduction mechanism 66 will be described in detail later.

[0024] A screw shaft 61 is connected to the tip of the output shaft of the reduction mechanism 66. The screw shaft 61 has a central axis coinciding with that of the output shaft and rotates in synchronization with the output shaft. The screw shaft 61 is aligned with the case axis. The female screw portion 46 of the nut member 45 is screwed into the male screw portion 62 on the outer periphery of the screw shaft 61. With this configuration, when the screw shaft 61 rotates in one direction or the other by being driven by the drive motor 64, the telescopic movable shaft 40 including the nut member 45 moves in one direction or the other along the case axis.

[0025] The nut screw moving mechanism 63 converts the power in the rotational direction of the output shaft of the reduction mechanism 66, based on the driving force of the drive motor 64, into power in the direction along the case axis so that the telescopic movable shaft 40 is driven to move in and out of the unit case 32 by the driving force of the drive motor 64. Then, as the telescopic movable shaft 40 moves along the case axial direction, the drive arm 13 rotatably fixed to the rotation support part 43 of the other end extension part 42 is driven to rotate about the door-side rotation shaft 6.

[0026] 6 is a perspective view partially showing the reduction gear mechanism 66. The reduction gear mechanism 66 has an input shaft 67 whose central axis coincides with that of the motor shaft of the drive motor 64 and which is connected to rotate synchronously with the motor shaft, and a gear mechanism 69 which reduces the power of the input shaft 67 and outputs the power to an output shaft 68. The input shaft 67 and the output shaft 68 of the reduction gear mechanism 66 are also aligned along the case axis, similar to the motor shaft of the drive motor 64. The gear mechanism 69 includes planetary gear units 70, 71, and 72 of multiple stages.

[0027] The first stage planetary gear unit 70 at the input shaft 67 side end has a sun gear 73 fixed to the input shaft 67, a ring gear 74 fixed to a case of the reduction mechanism 66, and a plurality of pinion gears 75 meshing between the sun gear 73 and the ring gear 74. The plurality of pinion gears 75 are rotatably supported at a plurality of positions in the circumferential direction of a carrier 76 that is disposed on the opposite side to the input shaft 67 and rotates. A first intermediate shaft 77 extends from the output side of the carrier 76, and a second stage sun gear 78 is fixed to the first intermediate shaft 77. The first stage planetary gear unit 70 reduces the power of the input shaft 67 and outputs it to the first intermediate shaft 77.

[0028] The second stage planetary gear unit 71, like the first stage, has a sun gear 78, a plurality of pinion gears 79, a ring gear 80, and a carrier 81, and a second intermediate shaft 82 extends from the output side of the second stage carrier 81. A third stage sun gear 83 is fixed to the second intermediate shaft 82. The second stage planetary gear unit 71 reduces the power of the first intermediate shaft 77 and outputs it to the second intermediate shaft 82.

[0029] The third stage planetary gear unit 72, like the first and second stages, has a sun gear 83, multiple pinion gears 84, a ring gear 85, and a carrier 86, and an output shaft 68 extends to the output side of the third stage carrier 86. Each of the ring gears 74, 80, and 85 is fixed to a case of the reduction gear mechanism 66. As a result, in the reduction gear mechanism 66, the power of the input shaft 67 is reduced in three stages and output to the output shaft 68. The input shaft 67, each of the intermediate shafts 77 and 82, and the output shaft 68 have the same central axis.

[0030] Although the reduction mechanism 66 having such a multi-stage planetary gear unit is longer along the case axis, the outer diameter of each planetary gear unit 70, 71, 72 can be reduced while increasing the deceleration rate. This prevents the outer diameter of the telescopic drive unit 31 from becoming excessively large, and the rotational force taken out from the drive motor 64 is significantly decelerated by the multi-stage planetary gear units 70, 71, 72, thereby enabling a high torque to be output. In the above, the reduction mechanism 66 has been described as having three planetary gear units, but the planetary gear unit of the reduction mechanism may have two stages or four or more stages.

[0031] FIG. 7 is a schematic diagram showing the operation of the opening / closing mechanism 10 in the embodiment. As shown in FIG. 7(a), when the protruding length of the telescopic movable shaft 40 from the unit case 32 is maximized, the vehicle door 3 is disposed in a door closing position for closing the vehicle entrance / exit. Then, when the tip of the telescopic movable shaft 40 moves in the direction of the arrow β by the rotation of the drive motor 64 in one direction, the length from the vehicle body side rotation shaft 5 to the arm side rotation shaft 60 of the hinge arm 12 does not change, so that the arm side rotation shaft 60 tries to move in the direction of the arrow γ so as to move to the outside of the vehicle body from the door side rotation shaft 6 so as to maintain that length. As a result, the hinge arm 12 rotates around the vehicle body side rotation shaft 5 in the direction of the arrow δ on the same side as the direction of the arrow γ. At this time, the vehicle body 2 and the vehicle door 3 are rotatably supported by the hinge arm 12 and the auxiliary link 90 (FIG. 4A), which are parallel links. As a result, the vehicle door 3 moves in parallel to the vehicle outside to the door opening position of FIG. 7(b). As a result, the vehicle entrance / exit is opened. When the vehicle door 3 returns from the door open position to the door closed position, the reverse operation to that when moving from the door closed position to the door open position is performed, thereby closing the vehicle entrance / exit.

[0032] According to the vehicle door opening / closing mechanism 10 described above, the telescopic drive unit 31 is provided on the vehicle door 3 as a power source for opening and closing the vehicle door 3. This eliminates the need to fix a power source for opening and closing the door near the vehicle entrance / exit 4. This eliminates the need for a power source to be disposed near the vehicle entrance / exit 4 when the vehicle door 3 is open, thereby improving ease of getting in and out of the vehicle at the vehicle entrance / exit 4.

[0033] Furthermore, the reduction mechanism 66 includes a gear mechanism 69 having a multi-stage planetary gear unit. This eliminates the need to provide the vehicle door 3 with a reduction mechanism including a large gear that rotates about an axis in the vertical or longitudinal direction, or a drive motor with a large diameter. This makes it possible to increase the force in the extension / retraction direction of the telescopic movable shaft 40 while preventing the thickness of the vehicle door 3 from becoming excessively large, thereby increasing the rotational force of the hinge arm 12. This prevents the space around the vehicle entrance from becoming narrow even when the vehicle door 3 is closed, and allows the vehicle door 3 to be opened and closed more smoothly.

[0034] FIG. 8 is a diagram corresponding to FIG. 4A, showing an embodiment using another example of the hinge arm. In the configuration of the first example of the other example, the hinge arm 12a has a first extension portion 48 extending in a substantially longitudinal direction when the vehicle door 3 is closed, and an inner bent portion 49 that is bent at a substantially right angle from one end (the right end in FIG. 8) of the first extension portion 48 toward the inside in the vehicle width direction and has a U-shaped inner bent portion 49 that opens toward the outside in the vehicle width direction when viewed from above. The hinge arm 12a is shown with hatched areas other than the drive arm 54. The inner bent portion 49 has one end of a semicircular portion 51 connected to a leg portion 50 extending in the vehicle width direction on the first extension portion 48 side forming a U-shape, but no leg portion extending in the vehicle width direction is formed on the other end of the semicircular portion 51. A second extension portion 52 extending in a substantially longitudinal direction toward the inside of the inner bent portion 49 is connected to the other end of the semicircular portion 51. The tip of the second extension portion 52 is rotatably supported by the vehicle body side rotating shaft 5. An inclined portion 53 is connected to the other end of the first extension portion 48, which extends inclined forward toward the outside in the vehicle width direction when the door is closed, and whose tip is rotatably supported by the door side rotating shaft 6. A drive arm 54 rotatably fixed to the tip of the telescopic movable shaft 40 is extended integrally with the other end side of the inclined portion 53.

[0035] According to the configuration of this example, when the vehicle door 3 is closed, the first extension portion 48 of the hinge arm 12a is positioned outside the vehicle width direction from the vehicle body side rotation shaft 5, thereby preventing the main portion of the hinge arm 12a from extending too far into the passenger compartment.

[0036] In FIG. 8, the hinge arm 12b of the second modified example is shown by a dashed line. The hinge arm 12b is different from the hinge arm 12a of the first modified example in that the first extension 48a is disposed inward in the vehicle width direction from the vehicle body side rotation shaft 5 in the door closed state. One end (right end in FIG. 8) of the first extension 48a is connected to the second extension 52 via a quarter arc portion that is approximately half of the semicircular portion 51 of the hinge arm 12a of the first modified example. The other end (left end in FIG. 8) of the first extension 48a is connected to an inclined portion 53a that is longer than that of the first modified example. The other configuration of the second modified example is the same as that of the first modified example.

[0037] In the configuration of the second modified example, the main portion of the hinge arm 12b is inserted further into the interior of the vehicle when the door is closed than in the first modified example. For this reason, the hinge arm 12a of the first modified example is more preferable than the second modified example in terms of ensuring a larger interior space of the vehicle.

[0038] Furthermore, the hinge arm 12a of the first modified example has a semicircular portion 51 at the end on the vehicle body side rotating shaft 5 side. Therefore, when the vehicle body side rotating shaft 5 is provided near the passenger compartment side of a side panel 9 having an end edge 9a and a partial cross-sectional shape of which is shown by diagonal lattice in Fig. 8, near the entrance 4 of the vehicle body 2, it becomes easier to avoid interference between the side panel 9 and the hinge arm 12a. Other configurations and functions of this example are similar to those of Figs. 1 to 7.

[0039] In the above embodiment, the telescopic drive unit has a nut screw moving mechanism as the power direction changing mechanism. However, the telescopic drive unit may have another mechanism as the power direction changing mechanism, for example, a rack and pinion mechanism having a rack gear and a pinion gear meshing with the rack gear. [Explanation of symbols]

[0040] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 3 vehicle door, 4 vehicle entrance / exit, 5 vehicle body side rotating shaft, 6 door side rotating shaft, 7 vehicle body side rotating shaft, 8 door side rotating shaft, 9 side panel, 9a edge, 10 opening / closing mechanism, 12, 12a, 12b hinge arm, 13 drive arm, 31, 31a telescopic drive unit, 32 unit case, 33 bottom, 34 one end side extension portion, 35 rotation support portion, 40 telescopic movable shaft, 41 tube portion, 41a bottom, 42 other end side extension portion, 43 rotation support portion, 45 nut member, 46 female thread portion, 48, 48a first extension portion, 49 inner bent portion, 50 leg portion, 51 semicircular portion, 52 second extension portion, 53, 53a inclined portion, 54 drive arm, 59 support shaft, 60 Arm side rotating shaft, 61 screw shaft, 62 male thread portion, 63 nut screw moving mechanism, 64 drive motor, 66 reduction mechanism, 67 input shaft, 68 output shaft, 69 gear mechanism, 70, 71, 72 planetary gear portion, 73 sun gear, 74 ring gear, 75 pinion gear, 76 carrier, 77 first intermediate shaft, 78 sun gear, 79 pinion gear, 80 ring gear, 81 carrier, 82 second intermediate shaft, 83 sun gear, 84 pinion gear, 85 ring gear, 86 carrier.

Claims

[Claim 1] A vehicle door opening / closing mechanism that is guided movably between a closed position that closes a vehicle entrance and an open position that opens the door, a hinge arm having one end rotatably supported by a vehicle body-side rotation shaft of the vehicle and the other end rotatably supported by a door-side rotation shaft of the door, the hinge arm having a drive arm extending from the other end; a telescopic drive unit including a unit case disposed inside the door, one end of which is rotatably supported by a support shaft fixed to the door, and a telescopic movable part which moves in and out of the other end of the unit case along the case axial direction and has a tip end rotatably fixed to a tip end of the drive arm; Equipped with The telescopic drive unit is A drive motor is fixed in the unit case, and a power direction conversion mechanism converts a rotational power based on the drive force of the drive motor into a power in a direction along the case axis so that the telescopic movable part is driven in and out of the unit case by the drive force of the drive motor. Vehicle door opening and closing mechanism.

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