JP4876475B2 - Drive device - Google Patents

Description

  The present invention relates to a drive device provided with an electromagnetic clutch mechanism.

  Conventionally, various drive devices are known (for example, Patent Document 1). This drive device is integrally provided in a housing with a speed reduction mechanism for reducing the rotation of the motor and an electromagnetic clutch mechanism for transmitting the power of the speed reduction mechanism. As such a drive device, one having an electromagnetic clutch mechanism directly connected to a speed reduction mechanism is also known. That is, in this drive device, the speed reduction mechanism includes a worm formed on the rotating shaft of the motor and a worm wheel that meshes with the worm, and the electromagnetic clutch mechanism includes an armature, a rotor, and an electromagnetic coil body. The worm wheel has a protrusion and is supported so as to be relatively rotatable around the rotating shaft, and the armature is supported so as to be relatively rotatable around the rotating shaft with an engagement hole. The armature is connected to rotate integrally with the worm wheel by fitting the protrusion into the engagement hole.

  On the other hand, the rotor is supported so as to rotate integrally with the rotary shaft, and can be frictionally engaged with the armature. The electromagnetic coil body is disposed to face the armature with the rotor interposed therebetween, and is fixed to the housing.

With such a configuration, when the electromagnetic coil body is in a non-energized state, the frictional engagement between the armature and the rotor is released, so that no rotation is transmitted between them. On the other hand, in the energized state of the electromagnetic coil body, the armature is attracted to the rotor by the magnetic field formed by the electromagnetic coil body, and both are frictionally engaged. At this time, when the motor is driven to rotate the armature together with the worm wheel, the rotation of the armature is transmitted to the rotor. Thereby, a rotor rotates and a rotating shaft rotates.
JP 2000-177391 A

  By the way, for example, lubrication grease is applied to the meshing portions of the worm and the worm wheel. Therefore, in order to prevent such grease from entering the friction surfaces of the electromagnetic clutch mechanism (the contact surfaces with which the armature and the rotor are frictionally engaged), the outer periphery of the worm wheel protrusion (and the armature engagement hole) On the side, it has also been proposed to interpose an annular sealing member between the worm wheel and the armature.

  However, for example, grease may enter the friction surface of the electromagnetic clutch mechanism through the protrusion on the inner peripheral side of the seal member and the gap between the engagement portions of the engagement holes. When grease enters the friction surface of the electromagnetic clutch mechanism, required power transmission may not be ensured in the electromagnetic clutch mechanism.

  The objective of this invention is providing the drive device which can suppress the penetration | invasion of the grease to the friction surface of an electromagnetic clutch mechanism.

In order to solve the above-described problems, the invention according to claim 1 is directed to a housing, a drive-side rotating body having a protrusion and supported rotatably with respect to the housing, and a engagement with the protrusion. A to-be-sucked body having a joint hole and connected so as to rotate integrally with the driving-side rotator, a driven-side rotator and a coil that are arranged to face the to-be-sucked body and are rotatably supported by the housing An electromagnetic clutch mechanism comprising: an electromagnetic clutch mechanism comprising: an electromagnetic attraction force generated between the attracted body and the driven-side rotating body in response to energization of the coil, and power between the attracted body and the driven-side rotating body. In the driving device that frictionally engages the sucked body and the driven side rotating body so as to be able to transmit, an annular seal interposed between the driving side rotating body and the sucked body on the outer peripheral side of the protrusion A drive side provided with a member The rotating body, the rotating body side protrusion of the annular projecting toward the opposing surface of the seal member is formed, on one side of the seal member, and the rotary side protrusion in the protruding direction of the rotary section protrusion An annular seal member-side convex portion protruding so as to alternate with the rotor-side convex portion toward the opposing surface of the drive-side rotor is formed so as to overlap, and the rotor-side convex portion is formed on the seal member. The gist is that it is formed so as to be in contact with the opposing surface .
The gist of a second aspect of the present invention is that, in the drive device according to the first aspect, the seal-member-side convex portion is formed so as to be in contact with the opposing surface of the drive-side rotating body.

According to a third aspect of the present invention, in the drive device according to the first or second aspect , the rotator-side convex portion and the seal member-side convex portion are concentrically centered about the axis of the drive-side rotator. The gist is that it is formed.

According to a fourth aspect of the present invention, in the drive device according to any one of the first to third aspects, a plurality of at least one of the rotating body side convex portion and the seal member side convex portion is formed. The gist.

According to a fifth aspect of the present invention, in the drive device according to the fourth aspect, the rotating body side convex portion and the seal member side convex portion are each formed in a plurality, and the other side surface of the seal member is the suction target. And the outer peripheral edge abuts on the housing, and one of the plurality of seal member side convex portions is located on the inner peripheral edge of the seal member, and the drive The seal member side convex portions other than the seal member side convex portions formed on the inner peripheral edge of the seal member among the plurality of the seal member side convex portions are in contact with the protrusions of the side rotating body. The gist of the invention is that the seal member side convex portions and the rotary body side convex portions are alternately arranged, being sandwiched between the two rotary body side convex portions .

In the first and second aspects of the invention, the drive-side rotator is formed with an annular rotator-side convex portion that protrudes toward the facing surface of the seal member. Further, the seal member is alternately staggered with the rotating body side convex portion toward the opposing surface of the driving side rotating body so as to overlap with the rotating body side convex portion in the projecting direction of the rotating body side convex portion. A protruding annular seal member side convex portion is formed. Therefore, the rotator-side convex portion and the seal member-side convex portion form so-called irregularities between the drive-side rotator and the seal member so as to undulate in the radial direction on the outer peripheral side of the protrusion. A maze structure is formed. Therefore, for example, the labyrinth structure prevents the lubricating grease applied to the outer peripheral portion of the driving side rotating body from moving to the inner peripheral side and reaching the protrusion, and the protrusion and the engagement hole are fitted. It is possible to prevent the grease from entering the friction surfaces of the electromagnetic clutch mechanism (the contact surfaces on which the attracted body and the driven side rotating body are frictionally engaged) via the gap of the joint portion.

According to a third aspect of the present invention, the rotator-side convex portion and the seal member-side convex portion are formed concentrically around the axis of the drive-side rotator. And the sealing member side convex part is spaced apart and arranged by a fixed distance in the radial direction. Therefore, for example, even if the drive-side rotator and the seal member rotate relative to each other, the rotator-side convex portion and the seal member-side convex portion can be prevented from interfering with each other.

In the invention according to claim 4 , since at least one of the rotating body side convex portion and the seal member side convex portion is formed in plural, the radial unevenness forming the labyrinth structure also corresponds to this. To increase. Therefore, for example, it is possible to more reliably prevent the lubricating grease applied to the outer peripheral portion of the driving side rotating body from moving to the inner peripheral side and reaching the protrusion.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIGS. 1 and 2 are a plan view and a front view, respectively, showing the driving apparatus 10 of the present embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. As shown in the figure, the drive device 10 includes a housing 11, a motor 12, a speed reduction mechanism 13 and a frictional electromagnetic clutch mechanism 14 constituting a drive transmission mechanism, an electronic control device (hereinafter referred to as "ECU"). 16). The housing 11 includes a case 17, an ECU cover 18, and a motor housing 19.

  The case 17 is made of a resin material, and integrally includes a first case side accommodation portion 17a and a second case side accommodation portion 17b that are open to one side and the other side (upper side and lower side in FIG. 3) opposite to each other. Thus, it has a substantially S-shaped cross section. And the boundary part of these 1st case side accommodating parts 17a and the 2nd case side accommodating part 17b in which the opening side of the said case 17 is turned forms the partition 17c. As will be described later, the first case side accommodating portion 17a forms a first space S1 that accommodates the electromagnetic clutch mechanism 14 and the like, and the second case side accommodating portion 17b is a second space that accommodates the ECU 16. S2 is formed. The first and second spaces S1, S2 are partitioned through the partition wall 17c.

  The motor housing 19 is attached to the case 17 and closes the first space S1 in the first case side accommodating portion 17a. The motor housing 19 and the first case side housing portion 17a (case 17) are fastened and fixed by screws 22 (see FIGS. 1 and 3) at three locations on the outer peripheral side thereof. The motor housing 19 forms the first housing portion 11a of the housing 11 together with the first case side housing portion 17a.

  The ECU cover 18 is made of a resin material, and is attached to the case 17 and closes the second space S2 in the second case side accommodation portion 17b. The ECU cover 18 forms the second housing portion 11b of the housing 11 together with the second case side housing portion 17b.

  The motor 12 is placed on the second case side accommodating portion 17b via a cushion material 21 (see FIG. 1). The motor 12 is fixed to the housing 11 by the yoke housing 12a and the motor housing 19 being fastened.

  As shown in FIG. 3, the speed reduction mechanism 13 and the electromagnetic clutch mechanism 14 are accommodated in the first accommodating portion 11a. More specifically, a clutch shaft 25 as a rotating shaft is rotatably supported by the first housing portion 11a (housing 11) via bearings 23 and 24. The clutch shaft 25 protrudes from the motor housing 19 at the tip end on one side in the axial direction (the upper side in FIG. 3) so as to enable rotation transmission to the outside. The speed reduction mechanism 13 includes a worm 31 formed on the rotating shaft of the motor 12 and a worm wheel 32 as a driving side rotating body that meshes with the worm 31, and the worm 31 and the worm wheel 32 are engaged with each other. The rotation of the motor 12 is decelerated. Lubricating grease is applied to the meshing portion of the worm 31 and the worm wheel 32 (the outer peripheral portion of the worm wheel 32).

  The clutch shaft 25 is inserted into the worm wheel 32, and the worm wheel 32 is arranged around the clutch shaft 25 at an axially intermediate portion of the clutch shaft 25 on the bearing 23 (motor housing 19) side. It is supported for relative rotation.

  The motor housing 19 is formed with a bearing portion 19a having an inner diameter equivalent to the outer diameter of the bearing 23 (outer race) and projecting in a cylindrical shape on the worm wheel 32 side. On the other hand, the worm wheel 32 is formed with a peripheral wall portion 32a having an inner diameter equivalent to the outer diameter of the bearing portion 19a and projecting in a cylindrical shape on the motor housing 19 side. An inner peripheral surface 32c as a peripheral surface of the peripheral wall portion 32a is in sliding contact with the outer peripheral surface of the bearing portion 19a. Therefore, the worm wheel 32 is rotatably supported by the motor housing 19 in such a manner that it slides between the peripheral wall portion 32a and the bearing portion 19a. Further, the worm wheel 32 is positioned in the axial direction by the surface (the upper surface in FIG. 3) on one side in the axial direction of the peripheral wall portion 32 a being in contact (sliding contact) with the opposing surface of the motor housing 19. Yes. The sliding portions of the bearing portion 19a and the peripheral wall portion 32a, the axially one side surface of the peripheral wall portion 32a, and the sliding portion of the facing surface of the motor housing 19 are coated with lubricating grease. .

  The electromagnetic clutch mechanism 14 includes an armature 41, a rotor 42, and an electromagnetic coil body 43. The armature 41 is supported by the clutch shaft 25 through the clutch shaft 25 so as to be relatively rotatable around the clutch shaft 25, and rotates integrally with the worm wheel 32 by engagement with the worm wheel 32.

  That is, a plurality of protrusions 32b that protrude in parallel with the axial direction are formed on the surface on the other axial side of the worm wheel 32 (the lower surface in FIG. 3). On the other hand, the armature 41 is formed of a magnetic material into a disk shape, and is supported around the clutch shaft 25 on the bearing 24 side of the worm wheel 32 so as to be relatively rotatable. The armature 41 is formed with a plurality of engaging holes 41a penetrating in parallel with the axial direction corresponding to the protrusions 32b. The armature 41 is connected to rotate integrally with the worm wheel 32 by fitting the protrusions 32b of the worm wheel 32 into the engagement holes 41a.

  An annular seal member 40 is interposed between the opposing surfaces of the worm wheel 32 and the armature 41 on the outer peripheral side of the protrusion 32b (and the engagement hole 41a). The seal member 40 is made of, for example, a resin material. As shown in an enlarged view in FIG. 3, the seal member 40 is in close contact with the surface on the one side in the axial direction of the armature 41 (upper surface in FIG. 3). An annular surface of the housing 19 on the other side in the axial direction (the lower surface in FIG. 3) is in contact. That is, the first space S <b> 1 formed by the case 17 (first case side accommodating portion 17 a) is partitioned from the speed reduction mechanism 13 side by the seal member 40 on the outer peripheral side. The sealing member 40 is for suppressing entry of foreign matter (such as grease) from the worm wheel 32 (deceleration mechanism 13) side to the armature 41 (electromagnetic clutch mechanism 14) side.

  Here, the seal member 40 is formed with a plurality of (two) annular seal member-side convex portions 40 b and 40 c that protrude toward the opposing surface of the worm wheel 32. The seal member side convex portion 40b is formed to have a smaller diameter than the seal member side convex portion 40c, and is formed to be contracted so that the tip thereof abuts on the base portion of the protrusion 32b. On the other hand, the worm wheel 32 is formed with wheel-side convex portions 32d and 32e as a plurality of (two) annular-side convex portions projecting toward the opposing surface of the seal member 40. The wheel side convex portions 32d and 32e and the seal member side convex portions 40b and 40c are formed concentrically around the axis of the worm wheel 32 (clutch shaft 25). The wheel-side convex portion 32d has an intermediate diameter between the seal member-side convex portions 40b and 40c, and the wheel-side convex portion 32e is formed to have a larger diameter than the seal member-side convex portion 40c. And these wheel side convex parts 32d and 32e have overlapped with the said seal member side convex part 40b, 40c in the protrusion direction (axial direction). That is, the seal member side convex portions 40b and 40c protrude toward the opposite surface of the worm wheel 32 so as to be alternated with the wheel side convex portions 32d and 32e. Therefore, the wheel-side convex portions 32d and 32e and the seal member-side convex portions 40b and 40c undulate between the worm wheel 32 and the seal member 40 on the outer peripheral side of the protrusion 32b as it goes in the radial direction. Thus, a so-called labyrinth structure is formed. With this maze structure, the lubricating grease applied to the meshing portion of the worm 31 and the worm wheel 32 is prevented from moving to the inner peripheral side and reaching the protrusion 32b. At this time, the wheel side convex portions 32 d and 32 e are in contact with the seal member 40, and the seal member side convex portions 40 b and 40 c are in contact with the worm wheel 32.

  The worm wheel 32 is formed with an annular wall portion 32f that protrudes so as to overlap with the bearing portion 19a in the protruding direction (axial direction) of the bearing portion 19a between the bearing portion 19a and the clutch shaft 25. Has been. The annular wall portion 32f is formed in a circular shape centering on the axis of the bearing portion 19a (clutch shaft 25). Accordingly, the bearing portion 19a and the annular wall portion 32f allow the diameter between the motor housing 19 and the worm wheel 32 to be closer to the outer peripheral surface of the clutch shaft 25 than the bearing portion 19a. A so-called labyrinth structure is formed that is uneven so as to wave as it goes in the direction. With this maze structure, the lubricating grease applied to the sliding portions of the bearing portion 19a and the peripheral wall portion 32a is prevented from moving to the inner peripheral side and reaching the clutch shaft 25.

  The rotor 42 is formed of a magnetic material in a disk shape having an outer diameter equivalent to the outer diameter of the armature 41, and is press-fitted and fixed so as to be opposed to the armature 41 and rotate integrally with the clutch shaft 25. It is (insertion fixed). A friction plate is embedded in a surface 42a facing the armature 41 which is a surface on the one axial side of the rotor 42 (the upper surface in FIG. 3). Therefore, the rotor 42 and the armature 41 can be frictionally engaged by this friction plate. For example, when the rotor 42 and the armature 41 are frictionally engaged, a joined state of the electromagnetic clutch mechanism 14 is created, and when the frictional engagement of both is released, a non-joined state of the electromagnetic clutch mechanism 14 is created.

  The rotor 42 has a positioning flange 42b that protrudes radially outward along the other axial surface (the lower surface in FIG. 3). An annular magnet 44 is adhered and fixed to the outer peripheral surface of the rotor 42 in such a manner that it is placed on the positioning flange 42b and positioned in the axial direction. Therefore, the magnet 44 rotates together with the rotor 42. The magnet 44 has S and N poles alternately formed on the surface thereof. That is, the magnet 44 has a plurality of polarities. The magnet 44 is opposed to a Hall sensor (not shown) fixed to the housing 11 on the surface thereof. This Hall sensor outputs a signal corresponding to the polarity change of the magnet 44 in which the S pole and the N pole opposed to each other in accordance with the rotation of the rotor 42 are output to the ECU 16, thereby detecting the rotation state of the rotor 42. Is done.

  The electromagnetic coil body 43 includes a field core 45 and a coil 46, and is arranged to face the armature 41 with the rotor 42 interposed therebetween in the axial direction. The field core 45 is formed in an annular shape from a magnetic material, and is formed with a circumferential recess 45a concentrically recessed toward the other side in the axial direction (the lower side in FIG. 3). The rotor 42 is formed with an annular recess 42c concentrically provided toward one axial side (the upper side in FIG. 3). The field core 45 has the circumferential recess 45a formed on the rotor 42. It arrange | positions at the said recessed part 42c so that it may open toward the direction, and is fastened and fixed to the said case 17 (1st case side accommodating part 17a). The coil 46 is wound around an annular bobbin 48 and accommodated and fixed in a circumferential recess 45a. The terminal of the coil 46 is led out from the circumferential recess 45a so as to penetrate the circumferential recess 45a radially outward, and is electrically connected to the harness 49 (see FIG. 3).

  The coil 46 is energized from outside via the harness 49. As shown in FIG. 3, the partition wall 17c of the case 17 is formed with a clutch through hole 17f through which the harness 49 is inserted, and the electromagnetic clutch mechanism 14 (coil 46) accommodated in the first space S1. ) And the clutch-side connector 49a provided at the end of the harness 49, the same harness 49 is introduced into the second space S2 via the clutch through hole 17f.

  The ECU 16 is housed and held in the second space S2 (second housing portion 11b), and is protected by the second space S2 being closed by the ECU cover 18. The ECU 16 includes an ECU board 61 for mounting various electrical components. As shown in FIG. 3, an ECU-side connector housing 63 into which the clutch-side connector 49a is fitted and mounted is mounted on the ECU board 61. The ECU 16 is electrically connected to the electromagnetic clutch mechanism 14 (electromagnetic coil body 43) via a harness 49 provided with the clutch side connector 49a. The ECU 16 controls driving of the electromagnetic clutch mechanism 14 by controlling energization / non-energization of the electromagnetic coil body 43.

  Furthermore, the ECU 16 is electrically connected to the motor 12 (the connection mode with the motor 12 is not shown). The ECU 16 controls driving by controlling energization / non-energization of the motor 12.

  As described above, in the present embodiment, the drive transmission mechanism (the speed reduction mechanism 13 and the electromagnetic clutch mechanism 14) is accommodated in the first accommodating portion 11a of the housing 11, and the ECU 16 is accommodated in the second accommodating portion 11b. 12, the drive transmission mechanism and the ECU 16 are integrated.

  Here, the operation of this embodiment will be described. For example, when the electromagnetic coil body 43 is energized by the ECU 16, the armature 41 is attracted to the rotor 42 by the magnetic field formed by the electromagnetic coil body 43, and the electromagnetic clutch mechanism 14 is frictionally engaged. When the motor 12 is driven by the ECU 16 in this joined state, the worm wheel 32 rotates and the armature 41 rotates integrally therewith. Then, the rotation of the armature 41 is transmitted to the rotor 42 by frictional engagement with the rotor 42. As a result, the rotor 42 rotates and the clutch shaft 25 rotates.

  On the other hand, when the electromagnetic coil body 43 is turned off by the ECU 16 and the electromagnetic clutch mechanism 14 is turned off, the rotor 42 rotates together with the clutch shaft 25 when the clutch shaft 25 is rotated by an external force. At this time, the rotation of the rotor 42 is not transmitted to the armature 41 or the like, and the rotor 42 slides on the armature 41. Thereby, the smooth rotation of the clutch shaft 25 by an external force is allowed.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In this embodiment, due to the labyrinth structure formed between the worm wheel 32 and the seal member 40, the lubricating grease applied to the meshing portion of the worm 31 and the worm wheel 32 is located on the inner peripheral side. The movement to the projection 32b is suppressed, and the grease acts on the friction surface (the armature 41 and the rotor 42) of the electromagnetic clutch mechanism 14 through the gap between the projection 32b and the fitting portion of the engagement hole 41a. It is possible to suppress intrusion into these contact surfaces that are frictionally engaged.

  (2) In the present embodiment, the wheel-side convex portions 32d and 32e and the seal member-side convex portions 40b and 40c are formed concentrically around the axis of the worm wheel 32. The wheel-side convex portions 32d and 32e and the seal member-side convex portions 40b and 40c are spaced apart from each other by a certain distance in the radial direction. Therefore, for example, even if the worm wheel 32 and the seal member 40 rotate relative to each other, it is possible to prevent the wheel side convex portions 32d and 32e and the seal member side convex portions 40b and 40c from interfering with each other.

  (3) In the present embodiment, a plurality of wheel-side convex portions 32d and 32e and seal member-side convex portions 40b and 40c are respectively formed, so that the radial unevenness forming the maze structure also corresponds to this. To increase. Therefore, for example, the lubricating grease applied to the meshing portion of the worm 31 and the worm wheel 32 can be reliably prevented from moving to the inner peripheral side and reaching the protrusion 32b.

  (4) In this embodiment, due to the labyrinth structure formed between the motor housing 19 and the worm wheel 32, the grease for lubrication applied to the sliding portions of the bearing portion 19a and the peripheral wall portion 32a is inside. Moving to the circumferential side and reaching the clutch shaft 25 is suppressed, and grease is introduced into the electromagnetic clutch mechanism through a gap between insertion portions of the clutch shaft 25 (sliding portions of the clutch shaft 25 and the worm wheel 32). Intrusion into the 14 friction surfaces can be suppressed.

  (5) In the present embodiment, the annular wall portion 32f is formed in a circular shape centered on the shaft center of the bearing portion 19a, so that the annular wall portion 32f and the bearing portion 19a are arranged in the radial direction. They are spaced apart by a certain distance. Therefore, the worm wheel 32 can rotate around the bearing portion 19a in a stable posture without the bearing portion 19a and the annular wall portion 32f interfering with each other.

  (6) In this embodiment, it is possible to ensure the required power transmission in the electromagnetic clutch mechanism 14 by suppressing the grease from entering the friction surface of the electromagnetic clutch mechanism 14.

In addition, you may change the said embodiment as follows.
-In the said embodiment, there may be only one wheel side convex part (32d, 32e), or three or more. Similarly, there may be only one seal member side convex portion (40b, 40c), or three or more. However, it is preferable that the wheel-side convex portions and the seal member-side convex portions are the same number so that they can be alternately arranged, or the number difference thereof is up to one.

  In the above embodiment, the wheel side convex portions 32d and 32e and the seal member side convex portions 40b and 40c are not necessarily provided as long as interference between the wheel side convex portions 32d and 32e and the seal member side convex portions 40b and 40c can be avoided. The worm wheel 32 may not be formed concentrically around the axis.

  In the embodiment, the annular wall portion 32f may have a center shifted from the axis of the bearing portion 19a as long as interference between the bearing portion 19a and the annular wall portion 32f can be avoided. . Further, the annular wall portion 32f is not necessarily formed in a circular shape.

  In the embodiment, the friction plate of the rotor 42 may be embedded in the armature 41. In addition, a friction plate is not necessarily required to frictionally engage the rotor 42 and the armature 41.

The top view which shows one Embodiment of this invention. The front view which shows the same embodiment. Sectional drawing along the AA line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Drive device, 11 ... Housing, 11a ... 1st accommodating part, 11b ... 2nd accommodating part, 12 ... Motor, 13 ... Deceleration mechanism, 14 ... Electromagnetic clutch mechanism, 17 ... Case, 18 ... ECU cover, 19 ... Motor Housing, 19a ... bearing portion, 25 ... clutch shaft as rotating shaft, 32 ... worm wheel as driving side rotating body, 32b ... projection, 32c ... inner peripheral surface as peripheral surface, 32d, 32e ... as rotating body side convex portion Wheel side convex part, 32f ... annular wall part, 40 ... seal member, 40b, 40c ... seal member side convex part, 41 ... armature as suction body, 41a ... engagement hole, 42 ... as driven side rotating body Rotor, 46 ... Coil.

Claims (5)

A housing, a drive-side rotator that has a protrusion and is rotatably supported with respect to the housing, and an engagement hole that engages with the protrusion and is connected to rotate integrally with the drive-side rotator. An electromagnetic clutch mechanism including a coil and a driven-side rotating body that is disposed so as to face the sucked body and is rotatably supported with respect to the housing. Friction engagement between the suctioned body and the driven rotary body so that power can be transmitted between the suctioned body and the driven rotary body by an electromagnetic attractive force generated between the suction body and the driven rotary body. In the drive device
An annular seal member interposed between the driving side rotating body and the suctioned body is provided on the outer peripheral side of the protrusion,
The drive-side rotator is formed with an annular rotator-side convex portion that protrudes toward the facing surface of the seal member,
On one side surface of the seal member, the rotating member side convex portion is staggered toward the opposite surface of the driving side rotating body so as to overlap with the rotating body side convex portion in the protruding direction of the rotating body side convex portion. An annular seal member-side convex portion protruding to the
The drive device according to claim 1, wherein the rotator-side convex portion is formed so as to abut against a facing surface of the seal member .   The drive device according to claim 1,
  The drive device according to claim 1, wherein the seal-member-side convex portion is formed so as to abut against a facing surface of the drive-side rotator. The drive device according to claim 1 or 2 ,
The drive device according to claim 1, wherein the rotator-side convex portion and the seal member-side convex portion are formed concentrically around the axis of the drive-side rotator. In the drive device according to any one of claims 1 to 3 ,
At least one of the rotating body side convex portion and the seal member side convex portion is formed in plural.   The drive device according to claim 4, wherein
  A plurality of the rotating body side convex portions and the seal member side convex portions are respectively formed,
  The seal member has other side surfaces in close contact with the surface on one side in the axial direction of the sucked body, and an outer peripheral edge abutting against the housing,
  One of the plurality of seal member side convex portions is located on the inner peripheral edge of the seal member and abuts on the protrusion of the drive side rotating body,
  Of the plurality of seal member side convex portions, each seal member side convex portion other than the seal member side convex portion formed at the inner peripheral edge of the seal member is sandwiched between two adjacent rotating body side convex portions. The drive device is characterized in that the sealing member side convex portions and the rotating body side convex portions are alternately arranged.

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