JP2008278629A - Motor device and floating support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a motor device and a floating support device for easily grounding a motor body supported at a vehicle body through a bracket to a vehicle body with a relatively short ground line. <P>SOLUTION: A wiper motor 14 is float-supported and grounded to the vehicle body B by the floating support device 12 through the motor bracket 75 in the wiper motor device 10. The floating support device 12 includes a first flange part 88A between the vehicle body B and an attachment part 75A of the motor bracket 75, a second flange part 88B between the attachment part 75A and a head part 90A of a bolt 90, a grommet 88 having a spacer part 88C connecting the flange parts, a first ground plate 95 between the second flange part 88B and the attachment part 75A, a second ground plate 96 between the head part 90A and the second flange part 88B, and a ground line 98 connecting the first ground plate 95 with the second ground plate 96. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor device that is floatingly supported by a vehicle body and connected to ground, and a floating support device that causes the motor device to be floatingly supported and grounded.

In order to fix the wiper motor to the vehicle body using bolts and nuts, a technique is known in which the wiper motor is float-supported with respect to the vehicle body using a grommet so that vibration transmission from the motor to the vehicle body is cut off. In such a technique, a ground terminal provided at the other end of the ground wire connected to the wiper motor is grounded to the vehicle body by using bolts and nuts for fixing the wiper motor to the vehicle body. There is known a technique for fixing to the surface (for example, see Patent Document 1).
Japanese Utility Model Publication No. 63-38273

  By the way, in the structure fixed to a vehicle body in the flange part provided in the wiper motor housing like the structure disclosed by patent document 1, since this flange part and a motor main body are arrange | positioned comparatively close, it is short. Although it can be routed using a ground wire, for example, a motor device that is fixedly supported on the vehicle body via a bracket has the following problems with respect to ground connection to the vehicle body. In other words, in this configuration, since the motor housing fixing part and the motor body are disposed relatively apart from each other, the connection place is separated at one end and the other end of the ground wire, and the connection work is complicated. there were. In addition, since a relatively long ground wire that connects portions that are relatively spaced apart as described above is wired in an unstable posture, the ground wire may flutter due to vibrations from the vehicle or motor. There is concern.

  In consideration of the above-described facts, the present invention provides a motor device and a floating support capable of easily making a ground connection of the motor body supported by the vehicle body via the bracket to the vehicle body using a relatively short ground wire. The purpose is to obtain a device.

  According to a first aspect of the present invention, a motor device includes: a motor main body; a bracket to which the motor main body is fixed and the motor main body is electrically grounded; and a first motor unit disposed between a vehicle body and the bracket. A first elastic portion; a second elastic portion disposed on the opposite side of the vehicle body with respect to the bracket; and a spacer portion positioned between the first elastic portion and the second elastic portion. A vibration isolating member for floatingly supporting the bracket with respect to the vehicle body in a state where a fastening load is applied by a fastening member that passes through the elastic portion, the second elastic portion, and the spacer portion and is fixed to the vehicle body; A first ground plate that is sandwiched between one of the first elastic portion and the second elastic portion and the bracket by a load, and the fastening load A second earth plate sandwiched between the second elastic portion and the fastening member in contact with the fastening member, one end connected to the first earth plate, and the other end connected to the second earth plate A ground wire.

  In the motor device according to claim 1, the first elastic portion of the vibration isolating member is interposed between the bracket and the vehicle body, and the anti-vibration member is provided between the opposite side of the bracket to the first elastic portion side and the fastening member (vehicle body). Since the second elastic portion of the vibration member is interposed, the bracket, that is, the motor main body is floatingly supported with respect to the vehicle body. The floating support in the present invention is a support that allows both the proximity of the bracket to the vehicle body due to the compression elastic deformation of the first elastic portion and the separation of the bracket from the vehicle body due to the compression elastic deformation of the second elastic portion. Say. In this floating support state, the motor body is electrically connected to the vehicle body via the bracket, the first ground plate, the ground wire, the second ground plate, and the fastening member.

  Here, in the present motor device, since the first ground plate and the second ground plate, which are connecting portions by the ground wire, are held by the common vibration isolating member, the distance between the support portion of the bracket to the vehicle body and the motor main body. Regardless, the ground wire can be shortened. Since the first ground plate and the second ground plate connected to one end and the other end of the ground wire are fastened to the vibration isolation member by the fastening force of the common fastening member, the ground connection can be easily made to the worker. Can be made.

  Thus, in the motor device according to the first aspect, the ground connection of the motor main body supported by the vehicle body via the bracket to the vehicle body can be easily performed using a relatively short ground wire.

  The motor device according to a second aspect of the present invention is the motor device according to the first aspect, wherein the first ground plate extends from one of the first ground plate and the second ground plate toward the other side, A restricting portion for restricting angular displacement of the second earth plate around the axis of the fastening member with respect to the first earth plate;

  In the motor device according to claim 2, since the angular displacement around the axis of the fastening member of the second earth plate is restricted by the restricting portion, the second earth plate to which the other end of the earth wire is connected is connected to the earth wire. It can be assembled in a predetermined posture with respect to the first ground plate to which one end is connected.

  The motor device according to a third aspect of the present invention is the motor device according to the second aspect, wherein the first ground plate receives the spacer portion along a plane perpendicular to the axial direction of the fastening member. An opening is formed in a part of the circumferential direction so as to be accessible between the elastic portion and the second elastic portion, and the restricting portion includes the opening portion of the first ground plate and the fastening member. The angular displacement of the fastening member about the shaft relative to the first ground plate of the second ground plate is restricted so as to restrict the movement of the first ground plate in the direction connecting the shaft.

  In the motor device according to the third aspect, the first ground plate is approached from the outer peripheral side of the spacer portion in the vibration isolating member, and enters between the first and second elastic portions while receiving the spacer portion inside. On the other hand, the second ground plate is assembled so that the angular displacement around the axis of the fastening member is restricted by the restricting portion. If the first ground plate is moved from this state in the direction connecting the opening and the shaft of the fastening member (the direction opposite to the entry direction), the restriction portion and the second ground plate (and the ground wire are connected). And the movement of the first earth plate is restricted. For this reason, the position shift and removal with respect to the vibration isolating member of the first ground plate are prevented.

  According to a fourth aspect of the present invention, there is provided a floating support device in which a motor main body fixed to a motor bracket and electrically grounded is electrically grounded to the vehicle body via the bracket and is floatingly supported. And a first elastic part disposed between the vehicle body and the bracket, a second elastic part disposed on the opposite side of the vehicle body from the bracket, and the first elastic part. And a spacer portion positioned between the first elastic portion and the second elastic portion, and a fastening load is applied by a fastening member that passes through the first elastic portion, the second elastic portion, and the spacer portion and is fixed to the vehicle body. A vibration isolating member for floatingly supporting the bracket with respect to the vehicle body in a state, and one of the first elastic portion and the second elastic portion depending on the fastening load A first earth plate sandwiched between and in contact with the bracket; and a first ground plate sandwiched in contact with the fastening member between the second elastic portion and the fastening member by the fastening load. And a ground wire having one end connected to the first ground plate and the other end connected to the second ground plate.

  In the floating support device according to claim 4, the first elastic portion of the vibration isolation member is interposed between the bracket and the vehicle body, and between the opposite side of the bracket to the first elastic portion side and the fastening member (vehicle body). By interposing the second elastic portion of the vibration isolation member, the bracket, that is, the motor main body is floatingly supported with respect to the vehicle body. The floating support in the present invention is a support that allows both the proximity of the bracket to the vehicle body due to the compression elastic deformation of the first elastic portion and the separation of the bracket from the vehicle body due to the compression elastic deformation of the second elastic portion. Say. In this floating support state, the motor body is electrically connected to the vehicle body via the bracket, the first ground plate, the ground wire, the second ground plate, and the fastening member.

  Here, in the present floating support device, since the first ground plate and the second ground plate, which are connecting portions by the ground wire, are held by the common vibration isolating member, the bracket support portion for the vehicle body and the motor body The ground wire can be shortened regardless of the distance. Since the first ground plate and the second ground plate connected to one end and the other end of the ground wire are fastened to the vibration isolation member by the fastening force of the common fastening member, the ground connection can be easily made to the worker. Can be made.

  Thus, in the floating support device according to the fourth aspect, the ground connection of the motor main body supported by the vehicle body via the bracket to the vehicle body can be easily performed using a relatively short ground wire.

  A floating support device according to a fifth aspect of the present invention is the floating support device according to the fourth aspect, wherein the second ground plate extends from one of the first ground plate and the second ground plate to the other side. And a restricting portion for restricting angular displacement of the fastening member around the axis with respect to the first ground plate.

  In the floating support device according to claim 5, since the angular displacement around the axis of the fastening member of the second earth plate is restricted by the restriction portion, the second earth plate to which the other end of the earth wire is connected is connected to the earth wire. Can be assembled in a predetermined posture with respect to the first ground plate to which one end of the first earth plate is connected.

  The floating support device according to a sixth aspect of the present invention is the floating support device according to the fifth aspect, wherein the first ground plate receives the spacer portion along a plane orthogonal to the axial direction of the fastening member. It is formed in a shape that opens in a part of the circumferential direction so as to be accessible between the first elastic portion and the second elastic portion, and the restricting portion includes the opening portion of the first earth plate The angular displacement of the fastening member around the axis of the fastening member with respect to the first ground plate is restricted so as to restrict the movement of the first ground plate in the direction connecting the shaft of the fastening member. .

  In the floating support device according to claim 6, the first ground plate is approached from the outer peripheral side of the spacer portion in the vibration isolation member, and enters between the first and second elastic portions while receiving the spacer portion on the inside. . On the other hand, the second ground plate is assembled so that the angular displacement around the axis of the fastening member is restricted by the restricting portion. If the first ground plate is moved from this state in the direction connecting the opening and the shaft of the fastening member (the direction opposite to the entry direction), the restriction portion and the second ground plate (and the ground wire are connected). And the movement of the first earth plate is restricted. For this reason, the position shift and removal with respect to the vibration isolating member of the first ground plate are prevented.

  A wiper motor device 10 as a motor device according to an embodiment of the present invention will be described with reference to FIGS. First, the schematic overall configuration and electric circuit of the wiper motor device 10 will be described, and then the floating support device 12 for floatingly supporting the wiper motor device 10 on the vehicle body will be described in detail.

(General outline of geared motor)
FIG. 7 shows a schematic overall configuration of the wiper motor device 10 in a bottom view. As shown in this figure, the wiper motor device 10 includes a wiper motor 14 as a motor body. As shown in FIG. 8 with a part cut away, the wiper motor 14 includes a motor subassembly 16 and a speed reduction unit subassembly 18.

  As shown in FIG. 8, the motor subassembly 16 includes a yoke housing 20 formed in a bottomed cylindrical shape as an outer shell, an armature 22 as an armature housed in the yoke housing 20, and an armature 22. Power supply to the armature 22 through the commutator 26, the armature shaft 24 as a rotating shaft coaxially and integrally, a commutator 26 as a commutator provided on the armature shaft 24 on the side of the speed reduction unit subassembly 18 with respect to the armature 22, and the commutator 26 And a brush holder unit 28. The armature shaft 24, that is, the armature 22 and the yoke housing 20 are configured so that the axial direction is the front-rear direction.

  In the yoke housing 20, one end side along the axial direction of the armature 22 is drawn to form a bottom plate portion 20A, and a flange portion 20B extending to the outer peripheral side is formed at the opening end portion on the other end side. . The yoke housing 20 has a plurality of permanent magnets (not shown) arranged on the inner peripheral surface of the peripheral wall portion thereof, and these permanent magnets are supported so as to face the outer peripheral surface of the armature 22 respectively. Yes. That is, in the present embodiment, the motor subassembly 16 constituting the wiper motor 14 is configured as a magnet type motor.

  The brush holder unit 28 includes a brush holder 30, a pair of brushes 32 and 33 held by the brush holder 30 so as to be slidable with the commutator 26, and an internal wiring (not shown) embedded in the brush holder 30 as main parts. Has been. In this internal wiring, a pair of brushes 32 and 33 (armature 22 and commutator 26), and an external power source 84 and an operation switch 82, as will be described later, constitute an electric circuit 34 of the wiper motor 14.

  As shown in FIG. 8, the holder body 38 of the brush holder 30 is inserted into the yoke housing 20, and the flange 40 is abutted against the flange 20 </ b> B of the yoke housing 20. A pair of brush cases 38A each having a substantially rectangular cylindrical shape are integrally formed on the holder main body 38 so as to face the axis of the commutator 26. Each brush case 38A has a corresponding brush 32, 33 is independently inserted in the commutator 26 so as to be able to contact and separate. Each of the brushes 32 and 33 is electrically connected to the internal wiring of the brush holder unit 28 via a power supply line 36. Further, the brush holder 30 is formed with a connector box 35 for electrically connecting the internal wiring to the external power source 84, the operation switch 82 and the like.

  As shown in FIG. 8, a substantially cylindrical alignment bearing 41 is disposed at the center of the holder main body 38, and the armature shaft 24 is inserted into the alignment bearing 41 so that the tip 24A side is external. That is, it protrudes toward the speed reduction unit subassembly 18 side. On the other hand, the other end (not shown) of the armature shaft 24 is rotatably supported by a bearing (not shown) fixed to the center portion of the bottom plate portion 20 </ b> A of the yoke housing 20. As a result, the armature shaft 24, that is, the armature 22 is rotatably supported by the yoke housing 20 and the brush holder unit 28 via a pair of bearings.

  Further, the brush holder unit 28 includes a contact base 42 that protrudes toward the speed reduction unit subassembly 18, and the contact base 42 has three contact plates 44, 46, 48 that are electrically connected to the internal wiring. Support. These contact plates 44, 46, and 48 are slidably disposed on a movable conductive plate 60 to be described later, and constitute a part of the electric circuit 34 with the movable conductive plate 60.

  As shown in FIG. 8, the speed reducing portion subassembly 18 includes a gear housing 50 as an outer shell portion. The gear housing 50 has an opening on the bottom side, and the opening is closed by a motor bracket 75 described later (see FIG. 7). 8 illustrates the inside of the gear housing 50 by removing the bottom plate 50A (see FIG. 7) of the gear housing 50 shown in FIG.

  The gear housing 50 is integrally formed with a flange portion 50B extending from the end on the yoke housing 20 side to the outer peripheral side. As shown in FIGS. 1 and 2, the flange portion 50 </ b> B is abutted against the end surface of the flange portion 20 </ b> B of the yoke housing 20 with the flange portion 40 of the brush holder unit 28 interposed therebetween, and a plurality of screws 51. It is fastened and fixed to the flange portion 20B. Thus, the brush holder 30 is fixed to the motor subassembly 16 and the speed reduction unit subassembly 18 while being sandwiched between the yoke housing 20 and the gear housing 50.

  In addition, as shown in FIG. 8, the speed reduction unit subassembly 18 includes a worm 52 and a worm wheel 54 that are meshed with each other and disposed in the gear housing 50 as a speed reduction mechanism. The worm 52 is supported by a pair of front and rear bearings 55 disposed in the gear housing 50 so as to be rotatable about its own axis. The worm 52 is arranged coaxially with the armature shaft 24 of the motor subassembly 16, and the armature shaft is connected via the coupling 56 in a state where the motor subassembly 16 and the speed reduction unit subassembly 18 are coupled to each other. 24 is connected to be able to transmit torque.

  The worm wheel 54 is rotatably supported by the gear housing 50 through a rotation shaft 58 that is integrally fixed. The rotation of the worm 52 causes the rotation of the worm wheel 54 around the rotation shaft 58 that forms a discrepancy axis with the axis S of the worm 52. It is decelerated and rotates. As shown in FIG. 8, a thin film-like movable conductive plate 60 having a predetermined conductive pattern shape is provided on one end surface of the worm wheel 54 in the thickness direction. The tip of each contact plate 44, 46, 48 of the brush holder unit 28 is slidably contacted with the movable conductive plate 60. Thereby, in the wiper motor 14, the contact / separation state between the movable conductive plate 60 and the three contact plates 44, 46, 48 is switched according to the rotational position of the worm wheel 54.

  The movable conductive plate 60 is fixed by, for example, punching a conductive metal plate into a predetermined conductive pattern shape and fitting into one end surface of the worm wheel 54. In this embodiment, the thin film-like movable conductive plate 60 includes an annular portion 60A in which the two inner contact plates 44 and 46 are in contact with each other, and a circumferential direction of a region in which the inner peripheral side contact plate 46 is in contact with the annular portion 60A. A cutout portion 60B in which a part of the annular portion 60A is cut out and a projecting portion 60C that protrudes from a portion in the circumferential direction of the annular portion 60A to a region where the contact plate 48 on the outer peripheral side contacts are formed as main parts.

  Further, as shown in FIG. 8, the speed reducer subassembly 18 includes a pivot shaft 62 as an output shaft, and a swing mechanism 64 for converting the rotation of the worm wheel 54 into the reciprocating rotation of the pivot shaft 62. ing. As shown in FIG. 7, the pivot shaft 62 is rotatably supported by a bearing (not shown) so as to be parallel to the worm wheel 54 in a shaft support portion 50C protruding in a cylindrical shape from the gear housing 50. Has been. Although not shown in the drawings, the pivot shaft 62 of the wiper motor 14 is configured such that a wiper arm is connected to a tip portion protruding from the shaft support portion 50 </ b> C of the gear housing 50.

  As shown in FIG. 8, the swing mechanism 64 has a connecting rod 68 whose one end is rotatably connected to a portion of the worm wheel 54 that is radially spaced from the rotary shaft 58 via a support shaft (crank pin) 66. And a rotation lever 72 rotatably connected to the other end of the connecting rod 68 via a support shaft 70. The rotation lever 72 is connected to the pivot shaft 62 via the clutch mechanism 74. Although detailed description is omitted, the clutch mechanism 74 transmits the torque from the swing mechanism 64 to the pivot shaft 62 when the load (torque) of the pivot shaft 62 (wiper arm) is equal to or less than a predetermined value. The torque transmission from the swing mechanism 64 to the pivot shaft 62 is cut off when the load exceeds the predetermined value.

  As a result, in the deceleration unit subassembly 18, the rotation of the worm wheel 54 is converted into the reciprocating rotation of the rotating lever 72, that is, the pivot shaft 62 by the swing mechanism 64, and the wiper arm connected to the pivot shaft 62 is moved up and down. The wiping operation is performed while reciprocating between the inversion positions.

  The wiper motor 14 described above is supported by the vehicle body via a motor bracket 75 shown in FIG. In this embodiment, the motor housing 75 is fixedly joined to the motor housing 75 by screws on the mounting piece 50 </ b> D protruding from the outer periphery of the gear housing 50. In this state, the motor bracket 75 closes the opening of the gear housing 50 as described above. The structure for fixing the motor bracket 75 to the vehicle body will be described later together with the floating support device 12.

(Electric circuit of wiper motor)
FIG. 9A shows an electric circuit 34 for driving the wiper motor 14 described above. FIG. 9B shows a position detection composed of the contact plate 44 and the like and the movable conductive plate 60. An equivalent circuit of the electric circuit 34 of the wiper motor 14 is illustrated using the device 76 as a changeover switch. As shown in these drawings, the electric circuit 34 is a portion surrounded by a one-dot chain line L as an internal circuit 78 configured in the wiper motor 14, and includes an armature 22, a commutator 26, and a pair of brushes 32 and 33. The internal wiring of the brush holder unit 28, the contact plates 44 to 48, and the movable conductive plate 60 are included. Further, portions located on the one-dot chain line L in the internal circuit 78 are terminals 35 </ b> A, 35 </ b> B, and 35 </ b> C disposed in the connector box 35.

  9A and 9B, in the internal circuit 78, the terminal 35A, the brush 32, the commutator 26 (armature 22), the brush 33, the circuit breaker 79, and the internal ground 80 are mainly formed. The brush holder unit 28 is connected in series in this order by the internal wiring of the brush holder unit 28. In the internal circuit 78, the terminal 35B is connected to the contact plate 44 located at the center of the three contact plates, and the terminal 35C is connected to the contact plate 46 located on the inner peripheral side. Further, the outer peripheral contact plate 48 is connected (branched) between the circuit breaker 79 and the internal ground 80.

  The internal circuit 78 is connected to the operation switch 82. The operation switch 82 is electrically connected to the terminals 35A, 35B, and 35C. The operation switch 82 is configured to selectively switch between an ON state and an OFF state. In the OFF state, the terminal 35A and the terminal 35B are connected, and in the ON state, the terminal 35A and the terminal 35C are connected. It has become. Further, in the electric circuit 34, one end of the external power source 84 is connected (branched) between the operation switch 82 and the terminal 35C.

  Thus, in the electric circuit 34, when the operation switch 82 is in the ON state, the external power source 84 and the terminal 35A are electrically connected by the operation switch 82, so that the motor subassembly 16 (wiper motor 14) operates. It has become. On the other hand, in the electric circuit 34, when the operation switch 82 is in the OFF state, the terminal 35B and the terminal 35A are electrically connected by the operation switch 82, so that the brush 32 has contact plates 44, 46, The presence or absence of power supply is switched according to the contact state with 48 (the rotational position of the worm wheel 54).

  In this case, as shown in FIGS. 9 (A) and 9 (B), when the operation switch 82 is OFF, the contact plate 46 is positioned at the notch 60B and the contact plates 44, 46 are interposed via the movable conductive plate 60. In a state where there is no continuity, the brush 32 is disconnected from the external power supply 84, and the rotation of the motor subassembly 16 is stopped. On the other hand, when the contact plates 44 and 46 are electrically connected via the annular portion 60A, the external power source 84 is connected to the brush 32 via the operation switch 82 so that the rotation of the motor subassembly 16 is maintained. It has become. The movable conductive plate 60 cutout portion 60B and the overhang portion 60C constituting the position detection device 76 are set corresponding to the lower inverted position (storage position) of the wiper arm, respectively, and the conduction of the contact plates 44 and 46 is interrupted. Then, the contact plates 44 and 48 are brought into conduction, and a closed circuit not including the external power supply 84 is formed. Due to this closed circuit, a power generation load (braking force) acts on the armature 22 from which the power supply from the external power supply 84 is cut off against rotation due to inertia.

  In the electric circuit 34 of the wiper motor 14 described above, the internal ground 80 is configured to serve as both the negative pole of the power system for driving the motor subassembly 16 and the negative pole of the signal system of the position detection device 76. Although not shown, the internal ground 80 has a ground terminal connected to the internal wiring of the brush holder unit 28 in contact with the gear housing 50 or the motor bracket 75, and the gear housing 50 is electrically grounded to the vehicle body B. It is configured by being connected. Therefore, in this embodiment, the gear housing 50 and the motor bracket 75 are made of a conductive material (for example, metal). For example, the ground terminal connected to the internal wiring of the brush holder unit 28 may be sandwiched between the gear housing 50 and the motor bracket 75, or may be elastically contacted with the gear housing 50 or the motor bracket 75. It may be fixed with screws or the like.

  Although not shown, the connector box 35 is provided with a terminal for connecting a portion between the circuit breaker 79 and the internal ground 80 in the electric circuit 34 (internal wiring of the brush holder unit 28) to the external ground. ing. The wiper motor device 10 has the same structure as each part of the wiper motor device that does not require the internal ground 80.

(Configuration of floating support device)
In the wiper motor apparatus 10, the motor bracket 75, that is, the wiper motor 14 is floatingly supported with respect to the vehicle body B by the floating support device 12, and the gear housing 50 is electrically grounded to the vehicle body B.

  As shown in FIG. 7, the motor bracket 75 is attached to the vehicle body at a plurality of attachment portions 75A. In this embodiment, the plurality of attachment portions 75A are arranged to form a triangle in plan view. Further, the plurality of attachment portions 75A are respectively raised on the wiper motor 14 side with respect to the fixing portion 75B of the wiper motor 14 in the motor bracket 75, and the motor bracket 75 is located between the vehicle body B and the vehicle bracket B as shown in FIG. The wiper motor 14 is fixed to the vehicle body B. In this state, the shaft support portion 50C and the pivot shaft 62 are configured to protrude outside the vehicle body through a through hole H provided in the vehicle body B.

  In the wiper motor device 10, the floating support device 12 is applied to one of the three mounting portions 75A, and the floating support device 86 having no ground connection function is applied to the remaining mounting portion 75A. This will be specifically described below.

  FIG. 1 is a perspective view showing an attachment portion 75A supported on the vehicle body by the floating support device 12 and an attachment portion 75A supported on the vehicle body by the floating support device 86. 2 shows the floating support device 12 in a side view, and FIG. 3 shows an exploded perspective view of the floating support device 12.

  As shown in these drawings, the floating support device 12 includes a grommet 88 as a vibration isolating member. The grommet 88 is formed such that a first flange portion 88A as a first elastic portion and a second flange portion 88B as a second elastic portion protrude from both ends in the axial direction of the cylindrical member. A portion between the first collar portion 88A and the second collar portion 88B is a spacer portion 88C (see FIGS. 4B and 4C). Each part of the grommet 88 is integrally formed of an elastic material such as synthetic rubber.

  Between the first collar portion 88A and the second collar portion 88B of the grommet 88, a mounting portion 75A formed in a substantially C shape in a plan view of the motor bracket 75 enters from the outside in the radial direction of the spacer portion 88C. It has come to be. From this state, the attachment portion 75A is sandwiched between the first flange portion 88A and the second flange portion 88B by the fastening load.

  Specifically, as shown in FIGS. 1 and 2, in the floating support device 12, a bolt 90 as a fastening member passes through the grommet 88 and is screwed into the vehicle body B (a weld nut or the like provided on the vehicle body B). As a result, a fastening load in the axial direction is applied to the grommet 88, and the mounting portion 75A sandwiched between the first collar portion 88A and the second collar portion 88B is located on either side in the axial direction of the grommet 88. Are supported so as to be able to be displaced. That is, the motor bracket 75 is displaced in the direction close to the vehicle body B by the compression elastic deformation of the first flange portion 88A sandwiched between the vehicle body B and the mounting portion 75A, and the head portion 90A of the mounting portion 75A and the bolt 90 is moved. Is displaced in the direction away from the vehicle body B by the compression elastic deformation of the second collar portion 88B sandwiched therebetween. A washer 92 is interposed between the head 90A of the bolt 90 and the second flange 88B, and a collar 93 through which the bolt 90 passes is coaxially inserted into the grommet 88. ing.

  Although not shown, the configuration of the floating support device 12 is substantially the same as the structure of the floating support device 86. That is, the floating support device 86 is composed of a grommet 88, a bolt 90, and a washer 92 as main components. Therefore, the motor bracket 75 is supported on the vehicle body B by the floating support structure using the grommets 88 at the three attachment portions 75A.

  1 to 4, the floating support device 12 is different from the floating support device 86 in that it includes a ground connection member 94. The ground connection member 94 connects the gear housing 50 of the wiper motor 14 to the vehicle body B via the motor bracket 75, the ground connection member 94, and the conductive bolt 90 by electrically connecting the mounting portion 75 </ b> A and the bolt 90. It is like that. This will be specifically described below.

  As shown in FIGS. 2 and 3, the ground connection member 94 is electrically conductive first sandwiched between the first collar part 88A and the second collar part 88B together with the attachment part 75A while being in contact with the attachment part 75A. The ground plate 95, a conductive second ground plate 96 sandwiched between the head 90A and the washer 92 while being in contact with the head 90A of the bolt 90, and one end connected to the first ground plate 95 An earth wire 98 having the other end connected to the second earth plate 96, and an anti-rotation piece as a restricting portion for restricting the relative displacement of the second earth plate 96 with respect to the first earth plate 95 in the assembly process described later. 100 is configured as a main part. The ground wire 98 is formed of a flexible covered conductor.

  As shown in FIGS. 3 and 6, the first ground plate 95 includes a plate main body 95A having a substantially C-shape that is partially open in the circumferential direction and can receive the spacer 88C of the grommet 88 in plan view, One end of the main body 95A that protrudes from the main body 95A to the outer peripheral side in a substantially radial direction and the covering of the ground wire 98 is peeled off is crimped (crimped). In this embodiment, the first ground plate 95 is sandwiched between the attachment portion 75A and the second flange portion 88B. The second ground plate 96 includes a plate main body 96A formed in a substantially annular shape in which the male screw portion of the bolt 90 can pass through and the head 90A cannot pass through (see FIG. 4A) in plan view, and the plate main body 96A. And a crimping portion 96B, which is projected along the substantially radial direction from the outer circumference to the outer peripheral side and the other end portion of which the sheath of the ground wire 98 is peeled off, is crimped.

  As shown in FIGS. 1 and 4B, the anti-rotation piece 100 is erected from the periphery of the plate body 95A of the first ground plate 95, and has a hook shape (U-shape) on the tip side. A hook portion 100A is formed. In this embodiment, the hook portion 100A is open to the first ground plate 95 (root) side, and the anti-rotation piece 100 has a substantially J shape as a whole.

  The hook portion 100A restricts the rotation of the second earth plate 96 by inserting the crimping portion 96B between the pair of restriction walls 100B facing the circumferential direction of the grommet 88 in the assembled state of the ground connection member 94. It has become. In other words, the ground connection member 94 is configured such that the first ground plate 95 is inserted between the first collar portion 88A and the second collar portion 88B while receiving the spacer portion 88C of the grommet 88. The hook portion 100 </ b> A prevents the second ground plate 96 from being rotated around the head 90 </ b> A of the bolt 90 when the bolt 90 penetrating the 96, washer 92, and grommet 88 is screwed into the vehicle body B. It is like that.

  Further, as shown in FIG. 5, the anti-rotation piece 100 is configured such that the pressing portion 96 </ b> B of the second earth plate 96 positioned between the pair of regulating walls 100 </ b> B and 100 </ b> C, that is, the engaging portion with the anti-rotation piece 100 is a plate. It extends along a virtual straight line IL2 that forms an acute angle θ with a virtual straight line IL1 that connects the central portion in the circumferential direction of the opening 95C of the main body 95A and the axis C of the bolt 90 (grommet 88). Accordingly, when the first ground plate 95 is moved in the arrow A direction along IL1 from the state before the fastening by the bolt 90 shown in FIG. 5, the hook portion 100A (in this embodiment, the restriction wall 100C on the free end side). ) Interferes with (engages with) the crimping portion 96B of the second earth plate 96. In this embodiment, the crimping portion 95B of the first ground plate 95 extends along the virtual straight line IL1.

  In the ground connection member 94 described above, the first ground plate 95 pressed against the mounting portion 75A by the fastening load by the bolt 90 is electrically connected to the mounting portion 75A (motor bracket 75), and pressed to the head 90A of the bolt 90. The second earth plate 96 is electrically connected to the bolt 90 (vehicle body B). Thus, in the floating support device 12, the gear housing 50 of the wiper motor 14 is grounded to the vehicle body B by the ground connection member 94 as described above, and the electric circuit 34 of the wiper motor 14 is connected to the internal ground 80. .

  Next, the operation of this embodiment will be described.

  In the wiper motor apparatus 10 configured as described above, when the electric circuit 34 operation switch 82 of the wiper motor 14 is switched to the ON state, the brush 32 is electrically connected to the external power source 84 via the operation switch 82, and the brush 32 passes through the commutator 26. Since the armature 22 is supplied with power, the motor subassembly 16 operates. Then, the rotation of the armature 22 is transmitted while being decelerated to the worm wheel 54 via the armature shaft 24, the coupling 56, and the worm 52, and the rotation of the worm wheel 54 is reciprocated by the pivot shaft 62 via the swing mechanism 64. Converted to rotation. As a result, the wiper arm attached to the pivot shaft 62 wipes the windshield glass or the rear glass while reciprocating between the upper and lower inversion positions.

  On the other hand, when the operation switch 82 is switched to the OFF state, when the wiper arm is located at a position other than the lower reverse position (storage position), the brush 32 is externally connected via the movable conductive plate 60 of the position detection device 76. Since the power supply 84 is conducted, the operation of the motor subassembly 16 (rotation of the armature 22) is maintained. When the wiper arm reaches the lower inversion position, the cutout portion 60B of the movable conductive plate 60 reaches the position of the contact plate 46, so that the conduction between the brush 32 and the external power source 84 is interrupted and the position of the contact plate 48 is reached. Since the overhang portion 60C is reached, a closed circuit is formed in the state shown in FIGS. 9A and 9B for the position detection device 76, and the armature 22 stops in a short time due to the braking force accompanying power generation. To do.

  In the wiper motor device 10, the motor bracket 75 to which the wiper motor 14 is fixed is floatingly supported on the vehicle body B via two floating support devices 86 and one floating support device 12. Therefore, vibration transmission from the wiper motor 14 to the vehicle body B is blocked by the grommet 88 that constitutes the floating support device 12 and the floating support device 86.

  Here, in the wiper motor device 10, since the motor bracket 75 joined and conducted to the gear housing 50 of the wiper motor 14 is grounded to the vehicle body B by the floating support device 12, in other words, the floating support device 12 is Since the motor bracket 75 and the vehicle body B are electrically connected by the ground connection member 94 or the like, the wiper motor 14 (gear housing) is used by using the short ground wire 98 regardless of the distance between the mounting portion 75A of the motor bracket 75 and the wiper motor 14. 50) and the vehicle body B can be conducted. That is, the internal ground 80 of the electric circuit 34 can be configured by grounding the gear housing 50 of the wiper motor 14 to the vehicle body B.

  Further, in the wiper motor device 10, the first ground plate 95 and the second ground plate 96 of the ground connection member 94 constituting the floating support device 12 are fixed to the same mounting portion 75 </ b> A of the motor bracket 75, so two different places Compared with the structure that requires fixing, the work posture and the tool posture are less changed, and the connection work for ground connection is easy. Moreover, in the wiper motor device 10, since the first ground plate 95 and the second ground plate 96 are fastened together by a fastening structure using a common bolt 90, both ends of the ground connection member 94 can be fixed in one step. Since this step is shared with the step for floatingly supporting the motor bracket 75, the connection work for ground connection is further facilitated.

  Further, in the wiper motor device 10 and the floating support device 12, the first ground plate 95 and the second ground plate 96 are connected by a flexible ground wire 98. Vibration transmission with the vehicle body B is prevented or suppressed. For example, in the case of a comparative example structure using a ground plate 200 folded back in a substantially U shape in a side view as shown in FIG. 10, vibration from the wiper motor 14 is transmitted to the vehicle body B through the ground plate 200, Due to this vibration, stress concentrates on the folded portion 200A of the earth plate 200 and causes fatigue. On the other hand, in the wiper motor device 10, by using the ground wire 98 having flexibility, vibration transmission between the wiper motor 14 and the vehicle body B is prevented as described above, and the ground wire 98 may be fatigued. Absent. Further, since the ground wire 98 is configured to be short as described above, fluttering of the ground wire 98 due to vibrations from the vehicle body B is prevented (suppressed within an allowable range).

  Furthermore, in the wiper motor device 10 and the floating support device 12, since the ground connection member 94 has the anti-rotation piece 100, the second ground plate 96 is the head of the bolt 90 in the fastening process in which the bolt 90 is screwed into the vehicle body B. It is prevented from being carried around to 90A. More specifically, the second ground plate 96 connected to the other end of the ground wire 98 is rotated relative to the first ground plate 95 provided with the anti-rotation piece 100 and connected to one end of the ground wire 98. In other words, since the posture of the second ground plate 96 with respect to the first ground plate 95 is maintained, the ground wire 98 is pulled during the fastening process to receive stress, surrounding parts, etc. And is prevented from interfering with.

  Further, since the accompanying prevention piece 100 is provided on the first earth plate 95 constituting the earth connection member 94, it is possible to constitute an accompanying prevention structure for the second earth plate 96 without increasing the number of parts. . For example, as shown in FIG. 11, in the configuration in which the anti-rotation piece 210 is provided on the motor bracket 75, the hook-type anti-rotation piece 210 is attached to the ground terminal on the motor bracket 75 that has a complicated shape due to strength requirements. The movement of the crimping portion 212A of 212 to both sides in the circumferential direction is restricted. In this configuration, it is necessary to add a process or change a mold for forming the accompanying prevention piece 210 in the motor bracket 75, and there is a concern that the yield may deteriorate. Further, when the motor bracket 75 formed with such an anti-rotation piece 210 is shared with a wiper motor device that does not require the internal ground 80, the anti-rotation piece 210 may interfere with the fastening operation. . On the other hand, in the wiper motor device 10 and the floating support device 12, since the anti-rotation piece 100 is provided on the first ground plate 95, the motor bracket 75 can be shared with the wiper motor device that does not require the internal ground 80. it can. Further, the anti-rotation piece 100 can be easily provided on the flat plate-like first earth plate 95 which does not require strength for supporting the wiper motor 14.

  In addition, in this embodiment, the anti-rotation piece 100 erected from the peripheral portion of the first earth plate 95 having a large diameter with respect to the second earth plate 96 protrudes in the radial direction on the second earth plate 96. Since the structure engages with 96B, the rotation is compared with a configuration (configuration included in the present invention) in which a rotation prevention piece that can be engaged from the second ground plate 96 to the first ground plate 95 is erected. The prevention piece 100, that is, the ground connection member 94 (floating support device 12) can be configured in a compact manner.

  Further, in the wiper motor device 10 and the floating support device 12, the first ground plate 95 having a substantially C shape in a plan view has an arrow A along an imaginary straight line IL1 connecting the opening 95C and the axis C of the bolt 90. The movement in the direction is prevented by the interference between the hook portion 100A of the anti-rotation piece 100 and the crimping portion 96B. For this reason, the second ground plate 96 is prevented from being detached from the grommet 88 and the attaching portion 75A in the fastening process by the bolt 90.

  Further, as shown in FIG. 5, the angle θ formed by the crimping portion 95B (virtual straight line IL1) and the crimping portion 96B (virtual straight line IL2) is an acute angle. The structure for connecting to the ground plate 96 is maintained, and the ground wire 98 does not have a portion with a large curvature. Further, since the directions of the crimping portion 95B and the crimping portion 96B are different from each other, for example, a ground wire 98 that is curved like a configuration in which these are overlapped (parallel) in the axial direction of the grommet 88 (a configuration included in the present invention) It is possible to prevent the first ground plate 95 from projecting toward the vehicle body B side. As a result, contact between the vehicle body B and the ground wire 98 due to vibration or the like is prevented or suppressed.

  In the above-described embodiment, an example in which the motor device of the present invention is applied to a wiper motor is shown. However, the present invention is not limited to this, and the present invention may be applied to a motor device of any application. In addition, the floating support device according to the present invention can be applied to a structure in which a motor for any application is supported on a vehicle body via a bracket.

  In the above-described embodiment, the example in which the first ground plate 95 is sandwiched between the second flange portion 88B and the attachment portion 75A has been described. However, the present invention is not limited to this, for example, the first ground plate The plate 95 may be configured to be sandwiched between the first collar portion 88A and the attachment portion 75A.

  Furthermore, in the above-described embodiment, the example in which the first collar portion 88A, the second collar portion 88B, and the spacer portion 88C of the grommet 88 are integrally formed is shown, but the present invention is not limited to this, Any one of the first collar part 88A and the second collar part 88B may be configured as a separate body. In this case, for example, the first ground plate 95 and the attachment portion 75A may be formed in an annular shape through which the spacer portion 88C can pass.

  Furthermore, in the above-described embodiment, an example in which the bolt 90 is screwed into the vehicle body B and the grommet 88, the attachment portion 75A, the first ground plate 95, and the second ground plate 96 are fastened to the vehicle body B is shown. The present invention is not limited to this. For example, the nut may be screwed into a bolt that is erected from the vehicle body B and penetrates the grommet 88 (collar 93), the washer 92, and the second ground plate 96.

It is a perspective view which expands and shows the principal part of the wiper motor apparatus which concerns on embodiment of this invention. It is the side view in which the wiper motor device concerning the embodiment of the present invention was partially cut away in the support state by the floating support device. It is a disassembled perspective view of the floating support apparatus which comprises the wiper motor apparatus which concerns on embodiment of this invention. It is a figure which shows the floating support apparatus which comprises the wiper motor apparatus which concerns on embodiment of this invention, Comprising: (A) is a top view, (B) is a front view, (C) is a side view. It is a top view explaining the retaining action of the 1st earth plate in the floating support device which constitutes the wiper motor device concerning the embodiment of the present invention. It is a perspective view which shows the earth connection member which comprises the floating support apparatus of the wiper motor apparatus which concerns on embodiment of this invention. 1 is a bottom view showing a schematic overall configuration of a wiper motor device according to an embodiment of the present invention. It is a bottom view which cuts out the schematic whole structure of the wiper motor which comprises the wiper motor apparatus which concerns on embodiment of this invention. It is a figure which shows the electric circuit for driving the wiper motor which comprises the wiper motor apparatus which concerns on embodiment of this invention, Comprising: (A) is a circuit diagram, (B) is an equivalent circuit schematic. It is a side view which shows the floating support apparatus which concerns on the comparative example with embodiment of this invention. It is a side view which shows the floating support apparatus which concerns on another comparative example with embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wiper motor apparatus (motor apparatus), 12 ... Floating support apparatus, 14 ... Wiper motor (motor main body), 75 ... Motor bracket (bracket), 88 ... Grommet (vibration isolation member), 88A ... 1st collar part (1st elastic part), 88B ... 2nd collar part (2nd elastic part), 88C ... Spacer part, 90 ... Bolt (fastening member), 95 ... First ground plate, 95C ... opening, 96 ... second ground plate, 98 ... ground wire, 100 ... anti-rotation piece (regulator), B ... vehicle body

Claims (6)

A motor body;
A bracket to which the motor body is fixed and the motor body is electrically connected to ground;
A first elastic portion disposed between the vehicle body and the bracket; a second elastic portion disposed on the opposite side of the vehicle body from the bracket; and the first elastic portion and the second elastic portion. A bracket portion positioned on the vehicle body in a state where a fastening load is applied by a fastening member that passes through the first elastic portion, the second elastic portion, and the spacer portion and is fixed to the vehicle body. An anti-vibration member for floating support;
A first earth plate sandwiched between the bracket and the bracket by either the first elastic part or the second elastic part by the fastening load;
A second earth plate sandwiched between the second elastic portion and the fastening member in contact with the fastening member by the fastening load;
A ground wire having one end connected to the first ground plate and the other end connected to the second ground plate;
A motor device comprising:   A restricting portion that extends from one of the first earth plate and the second earth plate toward the other side and restricts angular displacement of the second earth plate around the axis of the fastening member with respect to the first earth plate. The motor device according to claim 1, comprising: The first ground plate is circumferentially arranged so as to be accessible between the first elastic portion and the second elastic portion while receiving the spacer portion along a plane orthogonal to the axial direction of the fastening member. It is formed in a shape that opens in part,
The restricting portion restricts the movement of the first earth plate in the direction connecting the opening of the first earth plate and the shaft of the fastening member. The motor device according to claim 2, wherein angular displacement about the axis of the fastening member relative to the shaft is regulated. A floating support device for electrically connecting the motor body fixed to the motor bracket and electrically grounded to the vehicle body via the bracket and floatingly supporting the motor body,
A first elastic portion disposed between the vehicle body and the bracket; a second elastic portion disposed on the opposite side of the vehicle body from the bracket; and the first elastic portion and the second elastic portion. A bracket portion positioned on the vehicle body in a state where a fastening load is applied by a fastening member that passes through the first elastic portion, the second elastic portion, and the spacer portion and is fixed to the vehicle body. Anti-vibration member for floating support;
A first earth plate sandwiched between the bracket and the bracket by either the first elastic part or the second elastic part by the fastening load;
A second earth plate sandwiched between the second elastic portion and the fastening member in contact with the fastening member by the fastening load;
A ground wire having one end connected to the first ground plate and the other end connected to the second ground plate;
Floating support device with   A restricting portion that extends from one of the first earth plate and the second earth plate toward the other side and restricts angular displacement of the second earth plate around the axis of the fastening member with respect to the first earth plate. The floating support device according to claim 4, comprising: The first ground plate is circumferentially arranged so as to be accessible between the first elastic portion and the second elastic portion while receiving the spacer portion along a plane orthogonal to the axial direction of the fastening member. It is formed in a shape that opens in part,
The restricting portion restricts the movement of the first earth plate in the direction connecting the opening of the first earth plate and the shaft of the fastening member. The floating support device according to claim 5, wherein angular displacement about the axis of the fastening member relative to the shaft is restricted.

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