JP6244685B2 - Vehicle door opening and closing drive device - Google Patents

Description

  The present invention relates to a vehicle door opening / closing drive device.

  2. Description of the Related Art Conventionally, as a vehicle door opening / closing drive device, for example, a device described in Patent Document 1 is known. In this device, a drive pulley composed of a toothed pulley driven by an electric motor, a pair of driven pulleys, and a plurality of idle pulleys are provided at the lower part of the vehicle body, and an endless toothed belt is wound around these pulleys. The endless belt is linked to a vehicle door (sliding door) supported by the vehicle body. Then, the endless toothed belt is moved by driving the drive pulley, so that the vehicle door is driven to move (open / close drive) in the vehicle front-rear direction.

  At this time, since the drive pulley on which the endless toothed belt is hung is a toothed pulley, the occurrence of slippage is suppressed in the power transmission to the endless toothed belt. Alternatively, it is possible to prevent the endless toothed belt from being crushed when tension is generated in the endless toothed belt. Further, if the other pulleys (particularly, the pair of driven pulleys related to the folding of the endless toothed belt) are also toothed pulleys, the teeth of the endless toothed belt can be similarly prevented from being crushed.

  As shown in FIG. 12, the toothed pulley 90 includes a gear-shaped belt wheel portion 91 in which a plurality of teeth 91a are formed at equal angular intervals in the circumferential direction, and a radial direction from both axial ends of the belt wheel portion 91. What is comprised with a pair of substantially flange-shaped retaining part 92 extended outside is known. The belt wheel portion 91 meshes with the endless toothed belt by a plurality of teeth 91a, thereby suppressing the crushing of the above-mentioned endless toothed belt. The both retaining portions 92 are configured to prevent abnormal noise caused by dropping of the endless toothed belt or interference with peripheral parts caused by the endless toothed belt hung on the belt wheel portion 91 being displaced or suspended in the axial direction. Reduce the occurrence. As described above, smooth movement of the endless toothed belt is realized.

Japanese Patent No. 3448484

  By the way, in such a toothed pulley 90, water droplets and the like attached thereto tend to accumulate in a space defined by the teeth 91a, the tooth bottom (tooth base) 91b, and the retaining portion 92. In particular, when the axis of the toothed pulley substantially coincides with the vertical direction, water droplets and the like are more likely to collect in the space defined by the retaining portion 92 disposed below. For example, when the accumulated water droplets or the like freezes in a low temperature environment and becomes ice, when the endless toothed belt hung on the belt wheel portion 91 moves, the teeth of the endless toothed belt will get over the ice. May cause abnormal noise. Further, since the diameter (pulley diameter) of the belt wheel portion 91 is substantially enlarged due to ice, the locus of the endless toothed belt is artificially extended and the endless toothed belt is stretched. As a result, the operating force required to manually open and close the vehicle door increases. Furthermore, when the endless toothed belt crushes or climbs over the ice, the load and the path length fluctuate, and the behavior of the vehicle door and the operating force required for opening and closing operation change irregularly.

  An object of the present invention is to provide a vehicle door opening / closing drive device capable of quickly discharging water droplets and the like attached to a toothed pulley and suppressing the freezing thereof.

A vehicle door opening / closing drive device that solves the above problems opens and closes a plurality of pulleys including a driving pulley driven by an electric drive source, and an opening formed in the vehicle body by being hung on the plurality of pulleys. A toothed belt linked to a vehicle door, and the vehicle door is configured to open and close the opening when the toothed belt is moved by driving of the driving pulley. At least one of the pulleys includes a belt wheel portion in which a plurality of teeth meshing with the toothed belt, a pair of retaining portions extending radially outward from both axial ends of the belt wheel portion, The tooth bottom is formed between at least one of the pair of retaining portions, communicates between the plurality of teeth adjacent to each other in the axial direction and the belt belt portion side, and between the plurality of teeth adjacent to each other when viewed from the axial direction. ~ side And a drainage portion for opening width toward the Luo front end side is open radially outside the該抜only stop portion at the tip end side together is larger, the applicable formed of the drainage portion retaining portion Has a reinforcing part that protrudes more than the plurality of teeth on the adjacent tooth side in the circumferential direction as it approaches the root side of the plurality of teeth in the radial direction .

According to this structure, the said pulley (toothed pulley) can discharge | emit quickly the water droplet etc. which adhered to this pulley through the said drainage part, and can suppress the freezing .

  According to this configuration, since at least one of the pair of retaining portions is opened between the plurality of adjacent teeth, water droplets attached to the corresponding pulley (toothed pulley) are less likely to accumulate and freeze. Can be suppressed. Further, the mass of the pulley (toothed pulley) can be reduced by opening at least one of the pair of retaining portions.

  According to this configuration, the protrusion shape (retaining portion) is formed by reinforcing the base of the plurality of protrusion shapes of the retaining portion formed by opening between the plurality of adjacent teeth with the reinforcing portion. ) Can be suppressed, and as a result, the retaining strength of the retaining portion can be suitably ensured.

  The vehicle door opening / closing drive device further includes a support member that rotatably supports the pulley having the drainage portion, and the support member passes through the corresponding stopper portion formed with the drainage portion. It is preferable to have a cover portion that covers the outer side of the stop portion in the radial direction.

  According to this configuration, the projection-shaped portion, that is, the plurality of projection-shaped radial outer sides are covered with the cover portion, so that the projection shape is interfered with an obstacle approaching the corresponding pulley (toothed pulley). The possibility of breakage of the (prevention part) can be reduced.

Above for a vehicle door opening and closing device, provided with a pre-Symbol pulley unit the belt pulley portion side drain that is formed by a plurality of teeth on the non-formed in one side in the axial direction of the.
According to this configuration, since the plurality of teeth do not protrude from one side portion in the axial direction of the belt wheel portion, water droplets attached to the corresponding pulley (toothed pulley) are less likely to accumulate and the freezing is suppressed. Can do. Further, the mass of the pulley (toothed pulley) can be reduced by the amount that the plurality of teeth are not formed on one side portion in the axial direction of the belt wheel portion.

For the vehicle door opening and closing device, provided with a belt pulley portion side drain that is formed by opening the tooth bottom which is formed between the plurality of teeth to suit Ri next.
According to this configuration, since the tooth bottom formed between the plurality of adjacent teeth is opened, water droplets attached to the corresponding pulley (toothed pulley) are less likely to accumulate and the freezing thereof is suppressed. it can. Moreover, the mass of the pulley (toothed pulley) can be reduced by the amount of opening of the tooth bottom.

  The present invention has an effect that water droplets and the like adhering to a toothed pulley can be quickly discharged to suppress freezing.

The top view which shows one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. The side view which shows the vehicle with which the same embodiment is applied. The disassembled perspective view which shows a driven pulley. (A) is a top view which shows a driven pulley, (b) is sectional drawing which followed the 5B-5B line of (a). The top view which expands and shows the retainer part of a driven pulley. The perspective view which shows the deformation | transformation form of this invention. The longitudinal cross-sectional view which shows the modification. The perspective view which shows the deformation | transformation form of this invention. The longitudinal cross-sectional view which shows the modification. The perspective view which shows the deformation | transformation form of this invention. The perspective view which shows a prior art form.

  Hereinafter, an embodiment of a vehicle door opening / closing drive device will be described. In the following, the vehicle front-rear direction is referred to as “front-rear direction”, and the upper and lower directions in the vehicle height direction are referred to as “upward” and “downward”, respectively. Further, the inner side in the vehicle width direction toward the vehicle interior is referred to as “vehicle inner side”, and the outer side in the vehicle width direction toward the vehicle outer side is referred to as “vehicle outer side”.

  As shown in FIG. 3, the vehicle body 10 such as an automobile has an upper rail 11 and a lower rail 12 that extend in the front-rear direction along the upper and lower edges of an entrance 10 a as an opening formed on the side of the vehicle body 10. Each is installed. Further, the vehicle body 10 is provided with a center rail 13 extending in the front-rear direction in the quarter panel 10b behind the entrance 10a. The upper rail 11, the lower rail 12, and the center rail 13 support the slide door 20 so as to be movable in the front-rear direction via guide roller units 14, 15, and 16, respectively. The sliding door 20 opens and closes the entrance 10a as it moves in the front-rear direction.

  As shown in FIG. 1, the lower rail 12 is made of, for example, a metal plate, and has a curved portion 12 a at a longitudinal intermediate portion thereof, and a curved portion 12 b that is inclined toward the vehicle inner side at the front end side of the curved portion 12 a. And a linear portion 12c extending rearward of the vehicle on the rear end side of the curved portion 12a.

  The vehicle body 10 is provided with a drive unit 21 adjacent to the inner side of the lower rail 12. The drive unit 21 has a frame portion 22 as a support member made of, for example, a resin material that extends in the front-rear direction along the lower rail 12, and has a drive portion 25 installed at the front end portion of the frame portion 22. . A driven pulley 23 as a pulley is supported at the rear end portion of the frame portion 22 so as to be rotatable around an axis extending in the vehicle height direction, and is idled as a pulley at a middle portion in the front-rear direction near the curved portion 12a. The pulley 24 is supported so as to be rotatable around an axis extending in the vehicle height direction.

  On the other hand, the drive unit 25 includes an attachment member 26 made of, for example, a metal plate, and a motor 27 with a speed reducer fixed to the attachment member 26. The motor 27 rotationally drives a driving pulley 27a connected to the output shaft about an axis extending in the vehicle height direction. A tension pulley 28 as a pulley is supported on the mounting member 26 so as to be adjacent to the lower side of the pulley 27a in the figure so as to be rotatable about an axis extending in the vehicle height direction, and adjacent to the lower left side of the pulley 27a in the figure. A driven pulley 29 as a pulley is supported so as to be rotatable around an axis extending in the vehicle height direction.

  A ring-shaped endless toothed belt 30 as a toothed belt is wound around the driven pulley 23 and the like. That is, the endless toothed belt 30 extending rearward of the vehicle from the front driven pulley 29 toward the rear driven pulley 23 on the side close to the lower rail 12 is wound around the driven pulley 23 counterclockwise as shown in FIG. Turn to the front of the vehicle on the far side. An endless toothed belt 30 extending forward of the vehicle toward the idle pulley 24 is wound clockwise around the idle pulley 24 on the side close to the lower rail 12 and is shown on the tension pulley 28 on the side close to the lower rail 12. Winded clockwise. Subsequently, the endless toothed belt 30 is wound around the pulley 27a in the illustrated counterclockwise direction on the side away from the lower rail 12, and is wound on the front driven pulley 29 in the illustrated counterclockwise direction on the side close to the lower rail 12. It turns rearward and is connected to a part on the side close to the lower rail 12.

  Therefore, when the pulley 27a is rotationally driven by the motor 27, the endless toothed belt 30 moves along the frame portion 22 (lower rail 12) in a direction corresponding to the rotational direction. In addition, a substantially trapezoidal bracket 31 made of, for example, a metal plate is fixed to a predetermined position on the side close to the lower rail 12 of the endless toothed belt 30 (position in the vicinity of the driven pulley 23 in the state of FIG. 1). The guide roller unit 15 is fastened to the bracket 31.

  Here, in FIG. 1, for example, it is assumed that the driving pulley 27a rotates clockwise in the figure. At this time, the endless toothed belt 30 as a whole rotates clockwise in the figure, whereby the bracket 31 to which the guide roller unit 15 is fixed moves forward of the vehicle and the slide door 20 is closed. On the contrary, it is assumed that the driving pulley 27a rotates counterclockwise in the figure. At this time, the endless toothed belt 30 as a whole rotates counterclockwise in the figure, whereby the bracket 31 to which the guide roller unit 15 is fixed moves rearward of the vehicle, and the slide door 20 is opened.

  In particular, the slide door 20 is pushed out of the vehicle immediately after the guide roller unit 15 is guided to the curved portion 12a or the curved portion 12b, for example, immediately after opening from the fully closed position, or immediately before the fully closed position is reached. Is pulled into the car. This is because the sliding door 20 is allowed to slide backward when the sliding door 20 is opened, and is arranged so as to be flush with the side surface of the vehicle body 10 when the sliding door 20 is fully closed.

Next, the driven pulley 23 and its support structure will be described.
As shown in FIG. 2, the frame portion 22 includes a pulley support portion 41 having a substantially U-shaped cross section that opens toward the rear of the vehicle at the rear end portion. The pulley support portion 41 has a pair of substantially flat support flanges 42 and 43 arranged in parallel in the vehicle height direction, and from the rear ends of the support flanges 42 and 43 in the vehicle height direction facing each other. A pair of claw-shaped cover portions 44 and 45 extending respectively. A substantially stepped columnar support pin 46 having a center line extending in the vehicle height direction and penetrating both the support flanges 42 and 43 is supported on the pulley support portion 41 in a non-rotatable manner. The driven pulley 23 is rotatably supported around the support pin 46.

  That is, as shown in FIG. 4 and FIGS. 5A and 5B, the driven pulley 23 includes a main body 51, a plate 52, and a substantially cylindrical bush 53 with a flange. The main body portion 51 and the plate portion 52 are formed of, for example, a resin material. And the main-body part 51 has the belt wheel part 54 from which an axis line extends in a vehicle height direction. A plurality of teeth 54a extending in parallel with the axial direction are formed on the outer peripheral portion of the belt wheel portion 54 at equal angular intervals over the entire circumference. The plurality of teeth 54 a are formed so as to mesh with the endless toothed belt 30.

  The main body 51 has a retaining portion 55 that extends radially outward from the lower end of the belt wheel portion 54. The retaining portion 55 includes a plurality of retaining claws 55a that are uneven at equal angular intervals according to the unevenness of the plurality of teeth 54a. Therefore, in the circumferential direction, the positions of the tip and the root of each tooth 54a coincide with the positions of the tip and the bottom of the retaining claw 55a, respectively. Between a plurality of adjacent retaining claws 55a, a plurality of substantially V-shaped drainage portions 55b communicating in the vehicle height direction are formed. In other words, the plurality of drainage portions 55b are formed by opening the retaining portions 55 between the plurality of adjacent teeth 54a.

  As shown in an enlarged view in FIG. 6, the retaining portion 55 has a substantially bay-shaped reinforcing portion 56 between a plurality of adjacent teeth 54 a. As illustrated in FIG. 6, the original retaining claw P that protrudes in a square tooth shape corresponding to each tooth 54 a is drawn together with a two-dot chain line, so that the reinforcing portion 56 is in the root side of the plurality of teeth 54 a in the radial direction. As it approaches, it protrudes toward the adjacent tooth 54a in the circumferential direction. The reinforcing portion 56 is for reinforcing the roots of the plurality of protrusion shapes (the retaining claws P) of the retaining portion 55 formed by opening between the plurality of adjacent teeth 54a.

  As shown in FIG. 4, the main body 51 is formed with a substantially circular insertion hole 51a having a central portion opened in the vehicle height direction, and is equiangular (90 at the outer peripheral side of the insertion hole 51a. Degree)) A plurality (four) of mounting holes 51b are formed which open at intervals in the vehicle height direction. Further, as shown in FIG. 5B, the main body 51 is provided with a main body side locking portion 51c protruding from the inner wall surface on the outer peripheral side of each mounting hole 51b toward the inner peripheral side. The main body side locking portion 51c gradually protrudes toward the inner periphery as it goes downward, and is recessed toward the outer periphery at a substantially right angle at the lower end.

  As shown in FIG. 4, the plate portion 52 has a substantially flat plate-like retaining portion 57 and a plurality (four) projecting downward from the lower surface of the retaining portion 57 at an equal angle (90 degrees) interval. Mounting piece 58. And as shown in FIG.5 (b), the nail | claw-shaped plate part side latching | locking part 58a which protrudes toward an outer peripheral side is formed in the lower end of each attachment piece 58. As shown in FIG. The plate portion 52 is held on the main body portion 51 by engaging the plate portion side locking portion 58a of the corresponding mounting piece 58 inserted into each mounting hole 51b with the lower end of the main body portion side locking portion 51c. .

  At this time, the retaining portion 57 extends radially outward from the upper end of the belt wheel portion 54. The retaining portion 57 is composed of a plurality of retaining claws 57a that are uneven at equal angular intervals according to the unevenness of the plurality of teeth 54a. Therefore, in the circumferential direction, the positions of the tip and the root of each tooth 54a coincide with the positions of the tip and the root of the retaining claw 57a, respectively. Between a plurality of adjacent retaining claws 57a, a plurality of substantially V-shaped drainage portions 57b communicating in the vehicle height direction are formed. In other words, the plurality of drainage portions 57b are formed by opening the retaining portions 57 between the plurality of adjacent teeth 54a.

  The retaining portion 57 also includes the reinforcing portion 56 for reinforcing the roots of the plurality of protrusion shapes (the retaining claws P) of the retaining portion 57 formed by opening between the plurality of adjacent teeth 54a. It has the same reinforcing part (not shown).

  The bush 53 has an outer diameter equivalent to the inner diameter of the insertion hole 51a and an axial length equivalent to the length of the insertion hole 51a in the axial direction, so that the bush 53 cannot rotate into the insertion hole 51a from below the main body 51. Has been inserted.

  The driven pulley 23 configured as described above is rotatably supported around the support pin 46 by inserting the support pin 46 through the bush 53 and the plate portion 52 (preventing part 57) in the main body 51. Is done. The bush 53 is for improving the rotational slidability around the support pin 46 of the driven pulley 23.

Next, the operation of this embodiment will be described.
As shown in FIG. 4, the driven pulley 23 is formed with a plurality of drainage portions 55b by opening a retaining portion 55 between a plurality of adjacent teeth 54a. Therefore, water droplets and the like attached to the driven pulley 23 can be quickly discharged through the plurality of drainage portions 55b to suppress freezing. In particular, since the lower retaining portion 55 opens between a plurality of adjacent teeth 54a, water droplets adhering to the driven pulley 23 are less likely to accumulate and freezing can be suppressed.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the driven pulley 23 can quickly discharge water droplets and the like adhering thereto through the lower drainage portion 55b to suppress freezing.

  (2) In the present embodiment, since the lower retaining portion 55 is opened between a plurality of adjacent teeth 54a, water droplets adhering to the driven pulley 23 are difficult to accumulate and freezing can be suppressed. Further, the mass of the driven pulley 23 can be reduced by opening the retaining portion 55.

  (3) In the present embodiment, the reinforcing portion 56 reinforces the roots of the plurality of protruding shapes (the retaining claws P) of the retaining portion 55 formed by opening between the plurality of adjacent teeth 54a. Further, breakage of the protrusion shape (the retaining portion 55) can be suppressed, and as a result, the retaining strength of the retaining portion 55 can be suitably ensured.

  (4) As shown in FIG. 2, the frame portion 22 (pulley support portion 41) has a cover portion 45 that covers the retaining portion 55 formed with the drainage portion 55 b on the radially outer side of the retaining portion 55. Similarly, the frame portion 22 (pulley support portion 41) has a cover portion 44 that covers the retaining portion 57 formed with the drainage portion 57b on the radially outer side of the retaining portion 57. Accordingly, the cover portions 45 and 44 cover the radially outer sides of the retaining portions 55 and 57, that is, the plurality of projecting shapes (the retaining claws 55 a and 57 a) with the cover portions 45 and 44. The possibility of breakage of the (prevention portions 55, 57) can be reduced. For example, when the assembly direction of the frame portion 22 (drive unit 21) to the vehicle body 10 coincides with the direction starting from the rear end side of the frame portion 22, the driven pulley 23 at the time of assembly is It is possible to reduce the possibility that the protrusion shape (the retaining portions 55, 57) breaks due to interference.

  (5) In this embodiment, the drainage portions 55b and 57b are formed in the both retaining portions 55 and 57, respectively, so that the driven pulley 23 has a substantially vertically symmetric structure, so that the driven pulley can be used even in an upside down posture. 23 can be assembled. For this reason, the freedom degree of the installation attitude | position of the driven pulley 23 can be increased, and an assembly | attachment property can be improved.

  In addition, when the driven pulley 23 is assembled in an upside down posture, the driven pulley 23 can quickly discharge water droplets and the like adhering thereto through the lower drainage portion 57b in this case to suppress freezing. In particular, since the lower retaining portion 57 is opened between a plurality of adjacent teeth 54a, it is possible to prevent water droplets adhering to the driven pulley 23 from accumulating and suppressing freezing. Further, the mass of the driven pulley 23 can be reduced by the amount of opening of the retaining portion 57.

(6) In this embodiment, since the main body 51 and the plate 52 are separated, the structure of the mold for molding can be further simplified as compared with the case where they are integrally formed, for example.
(7) In this embodiment, by suppressing freezing of water droplets or the like attached to the driven pulley 23, it is possible to suppress abnormal noise generated when the teeth of the endless toothed belt 30 hung on the belt wheel portion 54 get over ice. Can do. Further, it is possible to suppress the endless toothed belt 30 from being stretched by ice, and it is possible to suppress an increase in operating force required when the sliding door 20 is manually opened and closed. Furthermore, fluctuations in the load and path length that occur when the endless toothed belt 30 crushes or climbs over the ice can be suppressed, and irregular changes in the operation force of the sliding door 20 and the operating force required for opening and closing operations can be suppressed. Can do.

In addition, you may change the said embodiment as follows.
As shown in FIGS. 7 and 8, instead of the driven pulley 23, an annular driven pulley 60 in which the retaining portion 66 on one side (the upper side in the vehicle mounted state) may be adopted. That is, the driven pulley 60 includes a main body portion 61 and a plate portion 62. The main body portion 61 and the plate portion 62 are formed of, for example, a resin material. The main body 61 has a belt wheel portion 63 and a retaining portion 64 similar to the belt wheel portion 54 and the retaining portion 55.

  The main body 61 is formed with a substantially circular insertion hole 61a that opens at the center in the vehicle height direction, and a mounting recess 61b is formed downward from the upper surface on the outer peripheral side of the insertion hole 61a. Has been.

  The plate portion 62 includes the retaining portion 66 and a mounting piece 67 that protrudes downward from the lower surface of the retaining portion 66 so as to face the mounting recess 61b. The plate portion 52 is held on the main body portion 61 by fitting the attachment piece 67 into the attachment recess 61b. The retaining portion 66 extends radially outward from the upper end of the belt wheel portion 63.

  The driven pulley 60 configured as described above is rotatably supported around the support pin 46 by inserting the support pin 46 through the main body 61 and the plate part 62 (the retaining part 64). By making changes in this way, the following effects can be obtained in addition to the same effects as (1) to (2) of the above embodiment. That is, since the retaining portion 66 is annular, the retaining strength of the retaining portion 66 can be suitably ensured. The main body portion 61 and the plate portion 62 may be integrally formed.

  As shown in FIGS. 9 and 10, instead of the driven pulley 23, a driven pulley 70 in which a plurality of teeth 73 a are not formed on one side (lower side in a vehicle-mounted state) may be employed. That is, the driven pulley 70 includes a main body portion 71 and a plate portion 72. The main body portion 71 and the plate portion 72 are formed of, for example, a resin material.

  The main body 71 has a belt wheel portion 73 whose axis extends in the vehicle height direction, and an annular retaining portion 74 that extends radially outward from the upper end of the belt wheel portion 73. A plurality of teeth 73a extending in parallel with the axial direction are formed at equal angular intervals on the entire outer periphery of the belt wheel portion 73. The plurality of teeth 73 a are formed so as to mesh with the endless toothed belt 30. On the other hand, the lower part of the outer peripheral portion of the belt wheel portion 73 in which the plurality of teeth 73a are not formed forms a substantially cylindrical drainage portion 73b having an outer diameter equivalent to the diameter of the root circle of the plurality of teeth 73a.

The main body 71 is formed with a substantially circular insertion hole 71a that opens at the center in the vehicle height direction. The lower portion of the insertion hole 71a is expanded to form a mounting hole 71b.
The plate portion 72 has an annular retaining portion 76 and a substantially cylindrical fitting projection 77 projecting upward from the upper surface of the retaining portion 76. The inner peripheral surface of the fitting protrusion 77 forms an insertion hole 77a having an inner diameter equivalent to that of the insertion hole 71a. The plate portion 72 is held on the main body portion 71 by fitting the fitting projection 77 into the mounting hole 71b. The retaining portion 76 extends radially outward from the lower end of the belt wheel portion 73.

  The driven pulley 70 configured as described above is rotatably supported around the support pin 46 by inserting the support pin 46 through the main body 71 and the plate portion 72 (fitting protrusion 77). By changing in this way, in addition to the same effect as (1) of the said embodiment, the following effects are acquired. That is, since the plurality of teeth 73a do not protrude from one side portion (lower side portion) in the axial direction of the belt wheel portion 73, water droplets adhering to the driven pulley 70 are hardly accumulated and freezing can be suppressed. Further, the mass of the driven pulley 70 can be reduced by the amount that the plurality of teeth 73a are not formed. The main body portion 71 and the plate portion 72 may be integrally formed. Further, the plurality of teeth 73a may be inclined with respect to the axial direction (vehicle height direction) as long as they extend in parallel to each other (so-called helical teeth).

  As shown in FIG. 11, instead of the driven pulley 23, a driven pulley 80 having an entire tooth bottom that is normally formed between a plurality of adjacent teeth 83 may be employed. That is, the driven pulley 80 has a pair of substantially annular retaining portions 81 and 82 having a center line extending in the vehicle height direction and juxtaposed in the direction, and is disposed at equal angular intervals. And a plurality of substantially band-like teeth 83 connecting the retaining portions 81 and 82 in the vehicle height direction. The plurality of teeth 83 extend in parallel to each other in the vehicle height direction and are formed into a sharp blade shape on the outer peripheral side. The plurality of teeth 83 are formed so as to mesh with the endless toothed belt 30 and constitute a belt wheel portion 85 as a whole. Then, the plurality of openings formed between the plurality of adjacent teeth 83 form drainage portions 84, respectively. That is, the plurality of drainage portions 84 are formed by opening the entire tooth bottom that is normally formed between the plurality of teeth 83 of the belt wheel portion 85.

  The driven pulley 80 configured as described above is rotatably supported around the support pin 46 when the support pin 46 is inserted into the retaining portions 81 and 82. By changing in this way, in addition to the same effect as (1) of the said embodiment, the following effects are acquired. That is, since the tooth bottom formed between the plurality of adjacent teeth 83 is opened, water droplets adhering to the driven pulley 80 are difficult to accumulate and freezing can be suppressed. Further, the mass of the driven pulley 80 can be reduced by the amount of opening of the tooth bottom. Further, each drainage portion 84 is formed over the entire length of the teeth 83 in the longitudinal direction, so that even if the direction of the center line (axis line) of the driven pulley 80 in the vehicle mounted state is arbitrarily set, the driven pulley Water droplets and the like attached to 80 can be quickly discharged through the drainage part 84. In addition, you may connect the inner peripheral part of the several tooth | gear 83 in the longitudinal direction intermediate part integrally, for example by the annular | circular shaped connection part. Moreover, you may make it provide the waste_water | drain part 84 in a part (for example, every other one etc.) between the some teeth 83 adjacent. Further, the plurality of teeth 83 may be inclined with respect to the axial direction as long as they extend in parallel to each other. Further, as shown in FIG. 11, for example, a part of the bottom of the tooth bottom may be opened without opening the whole tooth bottom.

In the embodiment, the base of the retaining claw 55a is thickened over the entire vehicle height direction by the reinforcing portion 56, but only a part in the vehicle height direction may be thickened.
In the embodiment, the main body 51 and the plate 52 may be integrally formed.

In the embodiment, the axial direction of the driven pulleys 23, 60, 70, and 80 in the vehicle mounted state may not completely match the vehicle height direction (gravity direction).
In the embodiment, the plurality of teeth 54a may be inclined with respect to the axial direction (vehicle height direction) as long as they extend in parallel to each other.

In the embodiment, the driving pulley 27a or the driven pulley 29 may have the same structure as the driven pulleys 23, 60, 70, and 80.
-In the above-mentioned embodiment, you may make it provide drainage part 55b in some (for example, every other one) between a plurality of adjacent teeth 54a.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body, 10a ... Entrance / exit (opening), 20 ... Sliding door (vehicle door), 27 ... Motor (electric drive source), 27a ... Driving pulley, 23, 29 ... Drive pulley (pulley), 24 ... idle pulley (pulley), 28 ... tension pulley (pulley), 30 ... endless toothed belt (toothed belt), 44, 45 ... cover part, 54, 63, 73, 85 ... belt wheel part, 54a, 73a, 83 ... teeth, 55, 57, 64, 66, 74, 76, 81, 82 ... retaining parts, 55b, 57b, 73b, 84 ... drainage parts, 56 ... reinforcing parts.

Claims (4)

A plurality of pulleys including a driving pulley driven by an electrical drive source;
A toothed belt linked to a vehicle door that opens and closes an opening formed in the vehicle body by being hung on the plurality of pulleys,
The vehicle door is configured to open and close the opening by moving the toothed belt by driving the driving pulley,
At least one of the plurality of pulleys is
A belt wheel portion formed with a plurality of teeth meshing with the toothed belt;
A pair of retaining portions extending radially outward from both axial ends of the belt wheel portion;
The tooth bottom is formed between at least one of the pair of retaining portions, communicates between the plurality of teeth adjacent to each other in the axial direction and the belt belt portion side, and between the plurality of teeth adjacent to each other when viewed from the axial direction. A drainage portion having an opening width that increases from the side toward the distal end side and opens radially outward of the retaining portion on the distal end side ;
The corresponding retaining portion formed with the drainage portion has a reinforcing portion that protrudes from the plurality of teeth on the adjacent tooth side in the circumferential direction as it approaches the tooth bottom side of the plurality of teeth in the radial direction. The vehicle door opening and closing drive device. The vehicle door opening / closing drive device according to claim 1 ,
A support member that rotatably supports the pulley having the drainage portion;
The vehicle door opening / closing drive device, wherein the support member includes a cover portion that covers the corresponding retaining portion formed with the drainage portion on the radially outer side of the retaining portion. The vehicle door opening / closing drive device according to claim 1,
Before SL with a belt pulley portion sheave portion side drain that is formed by the non-formation of said plurality of teeth in one side in the axial direction of the vehicular door opening and closing drive. The vehicle door opening / closing drive device according to claim 1,
With a belt pulley portion side drain that is formed by opening the tooth bottom which is formed between the plurality of teeth to suit Ri next to the vehicle door opening and closing drive device.