JP6302788B2 - Wiper motor for vehicles - Google Patents

Description

  The present invention relates to a vehicle wiper motor.

  In the wiper motor described in Patent Document 1 below, the drive circuit unit and the output shaft are arranged adjacent to each other. The cover that covers the opening of the case in which the wiring of the drive circuit unit, the circuit board, and the like are accommodated is formed with a cylindrical portion that is fitted around the sleeve that supports the output shaft. A waterproof cap is provided at the tip of the output shaft, and the cylindrical portion is disposed inside the waterproof cap. As a result, the wiper motor is waterproofed by the waterproof cap and the cover against the water that has entered from the mounting hole of the housing plate material.

JP 2001-138868 A

  By the way, in the vehicle wiper motor described in Patent Document 1, there is no description about the arrangement relationship between the heat sink and the cover for radiating the heat generated by the drive circuit unit. For this reason, for example, when a resin cover is mounted so as to cover the heat sink, the cover may be deformed by the heat dissipated by the heat sink. In this case, since the cover covers the heat sink, the heat dissipation by the heat sink may be hindered by the cover.

  In view of the above-described facts, an object of the present invention is to provide a vehicle wiper motor that can maintain heat dissipation by a heat sink while improving the mounting state of a water receiving member.

  A vehicle wiper motor according to the present invention includes a speed reduction mechanism configured to include a worm that rotates integrally with a rotation shaft of a motor main body, an output shaft that is drivingly connected to the worm, and a control that controls rotation of the motor main body. And a housing that accommodates the control unit and the speed reduction mechanism, and that supports the output shaft, and is formed in the housing and is orthogonal to the axis of the worm and the output shaft A heat sink that dissipates heat generated by the control unit, and is mounted on the tip side of the output shaft, and is disposed on one side of the worm orthogonal to the side opposite to the side on which the worm is disposed, And a water receiving member disposed around the output shaft on the other side in the worm orthogonal direction opposite to the one side in the orthogonal direction.

  According to the vehicle wiper motor having the above configuration, the rotation of the motor body is controlled by the control unit. In addition, the speed reduction mechanism includes a worm that rotates integrally with the rotation shaft of the motor body, and an output shaft that is drivingly connected to the worm. The control unit and the speed reduction mechanism are accommodated in the housing, and the output shaft is supported by the housing. Thereby, the rotational force of the motor body whose rotation is controlled by the control unit is output from the output shaft.

  Here, the housing is formed with a heat sink that dissipates heat generated by the control unit, and the heat sink is orthogonal to the worm axis and is opposite to the side on which the output shaft is arranged. Is arranged on one side of the worm orthogonal direction. On the other hand, a water receiving member is mounted on the distal end side of the output shaft, and the water receiving member is arranged around the output shaft on the other side in the worm orthogonal direction opposite to the worm orthogonal direction one side with respect to the worm axis. Has been. For this reason, the water receiving member and the heat sink are arranged apart from each other in the orthogonal direction orthogonal to the axis of the worm. Thereby, it can suppress that the heat radiating by a heat sink is inhibited by the water receiving member. Moreover, since the water receiving member does not directly receive the heat radiated by the heat sink, it is possible to suppress the water receiving member from being deformed by the heat.

  In the vehicle wiper motor of the present invention, in addition to the above configuration, an arm head constituting a wiper arm is directly fixed to the output shaft.

  According to the vehicle wiper motor configured as described above, the arm head is directly fixed to the output shaft. As a result, the output shaft of the vehicle wiper motor that fixes the wiper arm is projected to the outside of the vehicle, so that the vehicle wiper motor is easily exposed to water. However, both the heat radiating property and the waterproof property of the vehicle wiper motor are achieved by the water receiving member. Can be realized effectively.

  In the vehicle wiper motor according to the present invention, in addition to the above configuration, the arm head has a fixed portion fixed to the output shaft, and the fixed portion opens to the base end side of the output shaft. The water receiving member has a mounting end portion in which an insertion hole is formed to be inserted into the output shaft inside the fixed portion, and the output shaft A waterproof wall formed so as to protrude from the mounting end portion toward the tip end side of the output shaft is provided between the fixing portion and the fixing portion.

  According to the vehicle wiper motor configured as described above, the fixing portion of the arm head is formed in a cylindrical shape surrounding the output shaft, and is open to the proximal end side of the output shaft. Further, the water receiving member has a mounting end, and the mounting end is disposed inside the fixed portion. The mounting end portion is provided with a waterproof wall formed so as to protrude from the mounting end portion toward the distal end side of the output shaft, and the waterproof wall is disposed between the output shaft and the fixed portion. For this reason, what is called a labyrinth (maze) structure is comprised by the fixing | fixed part and a waterproof wall inside a fixing | fixed part. Thereby, it can prevent or suppress that the output shaft inside a waterproof wall is flooded.

  Further, in the vehicle wiper motor according to the present invention, in addition to the above configuration, the waterproof wall is formed in a concave shape opened to the front side of the vehicle when viewed from the axial direction of the output shaft, and the output shaft is provided with the waterproof shaft. It is arranged on the opening side of the wall.

  According to the vehicle wiper motor having the above configuration, when a liquid such as water enters the inside of the waterproof wall, the liquid is drained from the opening to the outside of the waterproof wall without collecting inside the waterproof wall. The

It is the top view seen from the motor upper side which shows the wiper motor for vehicles concerning this Embodiment. FIG. 2 is a side sectional view (sectional view taken along line 2-2 in FIG. 1) illustrating a state where the vehicle wiper motor illustrated in FIG. 1 is mounted on the vehicle. (A) is an enlarged side sectional view showing the vicinity of the mounting end of the water receiving member shown in FIG. 2, and (B) is a plan view of the mounting end shown in (A) from above the motor. It is a figure (3B arrow directional view of FIG. 3 (A)).

  Hereinafter, the vehicle wiper motor 20 according to the present embodiment will be described with reference to the drawings. As shown in FIG. 2, the vehicle wiper motor 20 is applied to a vehicle wiper device 10 for a front windshield glass WS of a vehicle (automobile) V. And the front windshield glass WS is inclined to the vehicle upper side as it goes to the vehicle rear side in a side view of the vehicle V. Note that the arrow FR shown in FIG. 2 indicates the front of the vehicle, and the arrow UP indicates the upper side of the vehicle.

  Further, a cowl louver 90 is provided on the front side of the front windshield glass WS. The cowl louver 90 extends in the vehicle width direction of the vehicle V along the lower edge of the front windshield glass WS, and is formed on the front windshield glass WS so as to be substantially parallel to the front windshield glass WS in a side view. It protrudes from the lower edge to the vehicle front side. Further, the cowl louver 90 is integrally formed with an arrangement portion 92 where an output shaft 56 of the vehicle wiper motor 20 described later is arranged. Arrangement portion 92 is formed in a substantially cylindrical shape whose axial direction is substantially perpendicular to the glass surface of front windshield glass WS, and extends from cowl louver 90 to the inside of vehicle V. And the hole of the arrangement | positioning part 92 is made into the arrangement | positioning hole 92A, and the arrangement | positioning hole 92A connects the inner side and the outer side of the vehicle V. FIG.

(Vehicle wiper motor 20)
As shown in FIG. 2, the vehicle wiper motor 20 is disposed inside the vehicle V with respect to the cowl louver 90. Further, the vehicle wiper motor 20 is disposed to be inclined in a side view corresponding to the inclination of the front windshield glass WS. For this reason, in the following description, the direction perpendicular to the glass surface of the front windshield glass WS in a side view is referred to as the motor vertical direction (the direction of arrow A and arrow B in FIG. 2), and the direction of arrow A is the motor. The upper side is the arrow B direction and the lower side of the motor. Further, the direction orthogonal to the motor vertical direction in a side view (viewed in the axial direction of the rotary shaft 28 described later) is the motor front-rear direction (the arrow C direction and the arrow D direction in FIG. 2). The arrow C direction side is the motor rear side (corresponding to one side of the worm orthogonal direction of the present invention), and the arrow D direction side is the motor front side (corresponding to the other side of the worm orthogonal direction of the present invention). Yes.

  As shown in FIG. 1, the vehicle wiper motor 20 includes a motor main body 22 configured as a so-called brushed DC motor, a housing 32, and a reduction mechanism 50 for reducing the rotation of the motor main body 22. It is configured. Further, the vehicle wiper motor 20 includes a control unit 60 (see FIG. 2) for controlling the rotation of the motor main body 22, and a water receiving member for preventing the vehicle wiper motor 20 from being wet by liquid such as water. 70.

(About motor body 22)
The motor body 22 includes a substantially bottomed cylindrical motor yoke 24 whose axial direction is the vehicle width direction of the vehicle V. A plurality of permanent magnets (not shown) are fixed to the inner peripheral surface of the motor yoke 24, and the permanent magnets are arranged so that the magnetic poles are alternately different along the circumferential direction of the motor yoke 24.

  An armature 26 is rotatably accommodated in the motor yoke 24 inside the permanent magnet. The armature 26 includes a rotation shaft 28, and the rotation shaft 28 is formed in a substantially round bar shape and is disposed coaxially with the motor yoke 24. An end portion on one axial side (the direction of arrow E in FIG. 1) of the rotary shaft 28 is rotatably supported on the bottom portion of the motor yoke 24 via a bearing (not shown). On the other hand, the portion on the other axial side of the rotating shaft 28 (the arrow F direction side in FIG. 1) is disposed in a housing 32 described later.

  The motor body 22 includes a brush holder device 30. The brush holder device 30 is formed in a substantially annular shape, and is disposed on the radially outer side of the rotating shaft 28 in the axially intermediate portion of the rotating shaft 28. Further, the brush holder device 30 includes a plurality of brushes (not shown), and these brushes are in contact with a commutator (not shown) of the armature 26 so as to be slidable.

(About housing 32)
The housing 32 is formed in a substantially box shape, and is disposed on the other side in the axial direction of the rotation shaft 28 (on the opening side of the motor yoke 24) with respect to the motor yoke 24. As shown in FIG. 2, the housing 32 is divided into two parts in the motor vertical direction. That is, the housing 32 includes a gear housing 34 that constitutes a motor upper portion of the housing 32 and a cover plate 44 that constitutes a motor lower portion of the housing 32.

  As shown in FIG. 1, the gear housing 34 is made of metal, is manufactured by die casting using aluminum (or aluminum alloy), and is formed in a substantially box shape opened to the lower side of the motor as a whole. Yes. The portion on the other side in the axial direction of the rotary shaft 28 of the motor main body 22 is disposed in the housing 32, and the other axial end portion of the rotary shaft 28 is rotatably supported by the gear housing 34.

  The gear housing 34 is integrally formed with a holder housing portion 36 for housing and supporting the brush holder device 30 of the motor body 22 described above. The holder housing portion 36 is disposed at a position facing the opening of the motor yoke 24 described above, and has a substantially bottomed cylindrical shape opened to one axial side of the rotating shaft 28 (arrow E direction side in FIG. 1). Is formed. The holder accommodating portion 36 is fixed to the opening of the motor yoke 24, thereby closing the opening of the motor yoke 24. A through hole (not shown) is formed in the bottom wall of the holder housing portion 36 in the axial direction of the rotary shaft 28, and the rotary shaft 28 extends from the holder housing portion 36 side (motor yoke 24 side) into the through hole. Is inserted.

  A heat sink 38 is formed integrally with the gear housing 34 on the outer surface of the gear housing. The heat sink 38 is disposed on the side opposite to the side on which the output shaft 56 (described later) is disposed with respect to the axis AL of the rotating shaft 28 (one side in the worm orthogonal direction, in this embodiment, the rear side of the motor). . The heat sink 38 includes a plurality of (in this embodiment, four) heat radiation fins 38A, and the heat radiation fins 38A are arranged with the axial direction of the rotary shaft 28 as the plate thickness direction, and are rotated. The shafts 28 are arranged side by side with a space in the axial direction. In other words, a recess that is open to the distal end side in the axial direction of the output shaft 56 to be described later is formed between the adjacent radiating fins 38A. As shown in FIG. 2, the heat sink 38 has a heat receiving surface 38 </ b> B that receives heat generated by the control unit 60 described later on the inner side of the gear housing. The heat receiving surface 38B is formed at a position facing a power element 64A on a circuit board 62 described later.

  Further, the gear housing 34 is formed with a support portion 40 for supporting an output shaft 56 described later. The support portion 40 is disposed on the motor front side (that is, the other side in the worm orthogonal direction and the arrow D direction side in FIG. 2) with respect to the axis AL of the rotating shaft 28. Further, the support portion 40 is formed in a substantially cylindrical shape, is arranged coaxially with the arrangement hole 92A of the cowl louver 90, and protrudes from the gear housing 34 to the upper side of the motor. Specifically, the support portion 40 is configured to include a support base end portion 40A that forms the base end portion of the support portion 40, and a support front end portion 40B that forms the front end portion of the support portion 40. The diameter of the support tip 40B is set smaller than the diameter of the support base 40A.

  A pair of ball bearings 42 is fitted inside the support base end portion 40A. The pair of ball bearings 42 are arranged side by side in the motor vertical direction (the axial direction of the output shaft 56 described later), and the inner diameter dimension of the ball bearing 42 is set to be substantially the same as the inner diameter dimension of the support front end portion 40B. Yes.

  The cover plate 44 is made of an insulating resin material. The cover plate 44 has a substantially rectangular parallelepiped box shape opened to the gear housing 34 side, and is formed in a shape corresponding to the shape of the opening of the gear housing 34. The opening of the gear housing 34 is closed by the cover plate 44.

(About the deceleration mechanism 50)
As shown in FIG. 1, the speed reduction mechanism 50 includes a worm 52, a worm wheel 54, and an output shaft 56. The worm 52 is formed integrally with a portion on the other axial side of the rotating shaft 28 (portion accommodated in the gear housing 34).

  The worm wheel 54 is formed in a substantially disc shape, and is opposite to the side on which the heat sink 38 is formed with respect to the axis of the worm 52 (that is, the axis AL of the rotary shaft 28) (the support unit 40 side [output described later). The shaft 56 side]) is housed in the gear housing 34. Specifically, the worm wheel 54 is disposed with the motor vertical direction as the axial direction, and is disposed coaxially with the support portion 40 of the gear housing 34. Gear teeth are formed on the outer peripheral portion of the worm wheel 54, and the gear teeth mesh with the worm 52.

  As shown in FIG. 2, the output shaft 56 is formed in a substantially cylindrical shape, and the vertical direction of the motor is the axial direction, and is disposed on the other side in the worm orthogonal direction with respect to the axis AL of the worm 52. The base end portion of the output shaft 56 is fixed to the shaft center portion of the worm wheel 54, and the output shaft 56 extends from the worm wheel 54 to the upper side of the motor. Thus, the worm wheel 54 and the output shaft 56 are configured to be integrally rotatable. An intermediate portion in the longitudinal direction of the output shaft 56 is disposed in the support portion 40 of the gear housing 34 and is rotatably supported by the pair of ball bearings 42 and the support tip portion 40B. When the motor body 22 is driven, the rotation of the rotary shaft 28 is decelerated by the speed reduction mechanism 50, and the output shaft 56 rotates about its own axis.

  As shown in FIG. 3A, the tip end portion of the output shaft 56 protrudes to the motor upper side than the support portion 40, and the tip end portion of the output shaft 56 is in the arrangement hole 92A of the cowl louver 90. Is arranged. Further, the tip of the output shaft 56 is formed in a step shape. Specifically, a tapered surface 56 </ b> A is formed on the outer peripheral surface at the distal end portion of the output shaft 56. The tapered surface 56A forms a frustoconical circumferential surface that is inclined radially inward of the output shaft 56 toward the upper side of the motor, and the tapered surface 56A is knurled. A portion of the front end portion of the output shaft 56 above the tapered surface 56A is a screw portion 56B. The screw portion 56B is formed in a substantially cylindrical shape and protrudes upward from the motor with respect to the cowl louver 90 (that is, exposed to the outside of the vehicle V from the arrangement hole 92A), and the outer periphery of the screw portion 56B. The part is formed with a male screw.

  Further, as shown in FIG. 2, the arm head 12 is fixed to the distal end portion of the output shaft 56. The arm head 12 constitutes the base end portion of the wiper arm 11 of the vehicle wiper device 10. In other words, the vehicle wiper device 10 is a type of wiper device in which the wiper arm 11 is directly fixed to the output shaft 56 of the vehicle wiper motor 20.

  A fixing portion 14 is formed at the base end portion of the arm head 12, and the fixing portion 14 is opened to the motor lower side (base end side of the output shaft 56) and surrounds the tip end portion of the output shaft 56. It is formed in a substantially bottomed cylindrical shape. Specifically, the fixed portion 14 includes a top wall 14A in which the vertical direction of the motor is the plate thickness direction, and a skirt portion that extends from the outer peripheral portion of the top wall 14A to the motor lower side (the base end side of the output shaft 56). 14B. The top wall 14A is formed with a fixed hole 14Aa through which the tip of the output shaft 56 is inserted, and the fixed hole 14Aa is formed in a tapered shape corresponding to the tapered surface 56A of the output shaft 56. Yes. The distal end portion of the output shaft 56 is inserted into the fixing hole 14Aa, and a nut (not shown) is screwed into the screw portion 56B, whereby the arm head 12 is fixed to the output shaft 56. Thereby, the periphery of the output shaft 56 is surrounded by the skirt portion 14 </ b> B of the arm head 12.

  The arm head 12 extends from the fixed portion 14 to the front windshield glass WS side. And the retainer (illustration omitted) which comprises the wiper arm 11 is connected with the front-end | tip part of the arm head 12, and the retainer is arrange | positioned substantially parallel to the front windshield glass WS. Further, a wiper blade (not shown) is connected to the distal end side of the retainer. When the vehicle wiper motor 20 is driven, the output shaft 56 reciprocates around the axis and the wiper arm 11 (wiper blade) reciprocally swings around the output shaft 56, so that the front windshield of the vehicle V is rotated. The glass WS is wiped by the wiper blade.

(About the control unit 60)
The control unit 60 is for controlling the rotation of the motor main body 22 and includes a circuit board 62 and an electric element 64. The circuit board 62 is fixed to the inner surface side of the cover plate 44 with the axial direction of the output shaft 56 being the plate thickness direction. The cover plate 44 closes the opening of the gear housing 34, so that the circuit board 62 is accommodated in the housing 32. In the state where the circuit board 62 is accommodated in the housing 32, a heat conductive adhesive (not shown) is interposed between the upper surface 62 </ b> A of the circuit board 62 and the heat receiving surface 38 </ b> B of the gear housing 34. This thermally conductive adhesive is a clay-like adhesive having viscosity and thermal conductivity, whereby the heat receiving surface 38B and the upper surface 62A of the circuit board 62 are in close contact with each other by the thermally conductive adhesive. .

  The electric element 64 is mounted on the lower surface 62 </ b> B of the circuit board 62. The electric element 64 includes a power system element 64A such as an FET for driving and controlling the motor main body 22, a control system element 64B such as a CPU, a rotation sensor, and a memory for controlling the rotation of the rotation shaft 28 (output shaft 56). ,have. The power element 64 </ b> A is disposed at a position corresponding to the heat receiving surface 38 </ b> B of the heat sink 38. That is, the power system element 64A is disposed at a position overlapping the heat receiving surface 38B in the vertical direction of the motor, in other words, at a position facing it. The controller 60 is electrically connected to the armature 26 via the brush holder device 30 of the motor body 22, and the motor body 22 is driven and controlled by the controller 60. Thereby, rotation of the rotating shaft 28 (namely, output shaft 56) of the motor main body 22 is controlled.

  Further, as shown in FIG. 1, a connector 66 is electrically connected to the circuit board 62, and the connector 66 extends from the cover plate 44 (not shown in FIG. 1) to one side in the axial direction of the rotary shaft 28. It is protruding. The connector 66 is formed in a concave shape opened to one side in the axial direction of the rotary shaft 28, and an external connector (not shown) on the vehicle side is connected to the connector 66. Thereby, electric power is supplied to the control unit 60.

(About the water receiving member 70)
As shown in FIGS. 1 and 2, the water receiving member 70 prevents the liquid such as water flowing into the vehicle V from the arrangement hole 92 </ b> A of the cowl louver 90 from entering the vehicle wiper motor 20, thereby preventing the vehicle from getting wet. This is for preventing water from entering the wiper motor 20. The water receiving member 70 is disposed so as to cover a part of the gear housing 34 from the front end side of the output shaft 56, and is viewed from the front end side of the output shaft 56 with respect to the axis AL of the rotary shaft 28 (worm 52). The output shaft 56 is disposed around the other output shaft 56 in the worm orthogonal direction where the output shaft 56 is disposed. That is, the heat sink 38 and the water receiving member 70 are spaced apart from each other in the worm orthogonal direction (motor longitudinal direction) with respect to the axis AL of the worm 52, and the axial direction of the output shaft 56 It is configured not to wrap. In other words, the water receiving member 70 is configured not to extend toward the heat sink 38 with respect to the axis AL of the rotating shaft 28 (worm 52) when viewed from the front end side of the output shaft 56 in the attached state. Further, the water receiving member 70 is disposed so as not to wrap with the opening of the connector 66 when viewed from the front end side of the output shaft 56. Specifically, the distal end portion of the connector 66 protrudes toward the one axial side of the rotary shaft 28 with respect to the water receiving member 70. The water receiving member 70 is attached to a bracket 46 (see FIG. 2) fixed to the gear housing 34. In FIG. 1, the bracket 46 is not shown.

  The water receiving member 70 is made of rubber and is formed in a concave shape (groove shape) extending in the front-rear direction of the motor. Specifically, the water receiving member 70 includes a periphery of the output shaft 56 and a water receiving portion 72 that covers the upper surface portion of the gear housing 34 on the other side in the worm orthogonal direction with respect to the axis AL of the worm 52 and the axis AL. And a discharge portion 74 that extends from the water receiving portion 72 to the side of the housing 32 on the other side in the worm orthogonal direction and discharges a liquid such as water received by the water receiving portion 72. . The bottom wall of the water receiving portion 70A is a receiving portion 72A. The receiving portion 72A is arranged around the output shaft 56 with the motor vertical direction being the plate thickness direction, and is viewed from the front end side of the output shaft 56. Thus, it is formed in a substantially semicircular shape that protrudes toward the rear side of the motor. In other words, the receiving portion 72 </ b> A is disposed on the vehicle lower side of the arrangement hole 92 </ b> A of the cowl louver 90 so as to be inclined toward the vehicle lower side toward the vehicle front side in a side view. Thereby, when a liquid such as water flows into the upper surface of the receiving portion 72A, the liquid flows to the front end side of the water receiving member 70 by gravity.

  In addition, the bottom wall of the discharge portion 74 is a slope portion 74A, and the slope portion 74A extends from the front end of the receiving portion 72A, and inclines toward the motor lower side (side of the housing 32) toward the motor front side. Has been. In other words, the slope portion 74A extends downward from the front end of the receiving portion 72A. And the peripheral wall part 76 of the water receiving member 70 is extended to the motor upper side from the outer peripheral part of the receiving part 72A and the slope part 74A in the part except the front end (lower end) of the slope part 74A, and the front end side of the output shaft 56 When viewed from the side, the cowl louver 90 is disposed so as to be located on the radially outer side of the output shaft 56 (more specifically on the radially outer side of the placement hole 92A) with respect to the placement portion 92 of the cowl louver 90. Thereby, the front end (lower end) of the slope part 74A (discharge part 74) is opened to the vehicle lower side, and water or the like flowing into the upper surface of the receiving part 72A flows from the receiving part 72A to the slope part 74A. It drains from the front end of 74A to the vehicle lower side. The height of the peripheral wall portion 76 is set so that the open end of the skirt portion 14B is positioned inside the peripheral wall portion 76 in a state where the wiper arm 11 is fixed to the output shaft 56.

  Further, as shown in FIG. 3A, a cover portion 78 is integrally formed at a substantially central portion of the receiving portion 72A. The cover portion 78 is formed to bulge from the receiving portion 72A toward the distal end side of the output shaft 56, and is formed in a substantially bottomed cylindrical shape opened to the lower side of the motor. And the support part 40 of the gear housing 34 is arrange | positioned inside the cover part 78. As shown in FIG. Thereby, the support part 40 is covered from the outside by the cover part 78. Further, the top wall of the cover portion 78 is a mounting end portion 78A, and an insertion hole 78Aa through which the output shaft 56 is inserted is formed through the mounting end portion 78A. When the output shaft 56 is inserted into the insertion hole 78 </ b> Aa, the lip 78 </ b> C formed on the inner peripheral surface of the insertion hole 78 </ b> Aa is set to slidably contact the outer peripheral surface of the output shaft 56. Thereby, liquid such as water is prevented or suppressed from entering the motor lower side (gear housing 34 side) from between the insertion hole 78Aa and the output shaft 56.

  Further, the outer diameter of the cover portion 78 (mounting end portion 78A) is set smaller than the inner diameter size of the skirt portion 14B of the arm head 12, and the mounting end portion 78A is disposed inside the skirt portion 14B. . Further, a waterproof wall 82 is formed integrally with the mounting end portion 78A. The waterproof wall 82 is formed on the rear side of the motor (front windshield glass WS side) with respect to the axis of the output shaft 56 so as to protrude from the mounting end portion 78 </ b> A toward the front end side of the output shaft 56. It arrange | positions between the skirt parts 14B. Specifically, as shown in FIG. 3B, the waterproof wall 82 has a concave shape opened to the front of the motor when viewed from the front end side of the output shaft 56 (specifically, with respect to the outer peripheral surface of the output shaft 56). It is formed in a substantially semicircular shape (substantially C shape) that forms a concentric circle. An output shaft 56 is disposed on the opening 82 </ b> A side of the waterproof wall 82. Accordingly, the waterproof wall 82 and the skirt portion 14B are arranged in the radial direction of the output shaft 56 on the rear side of the motor (front windshield glass WS side) with respect to the axis of the output shaft 56, and the waterproof wall 82 and A so-called labyrinth (maze) structure is formed by the skirt portion 14B (see FIG. 3A).

  Next, the operation and effect of the present embodiment will be described.

  In the vehicle wiper device 10 configured as described above, the arm head 12 is fixed to the tip of the output shaft 56 of the vehicle wiper motor 20. When the rotation shaft 28 of the motor body 22 is rotated forward and backward by the control of the control unit 60, the output shaft 56 of the speed reduction mechanism 50 is rotated forward and backward around its own axis. As a result, the wiper arm 11 (wiper blade) of the vehicle wiper motor 20 is reciprocally swung around the axis of the output shaft 56, and the windshield glass WS of the vehicle V is wiped by the wiper blade.

  Further, the vehicle wiper motor 20 includes a water receiving member 70, and the water receiving member 70 is disposed on the vehicle lower side of the arrangement hole 92 </ b> A of the cowl louver 90. For this reason, when a liquid such as water enters the inside of the vehicle V from the arrangement hole 92 </ b> A of the cowl louver 90, the liquid is received by the water receiving portion 72 of the water receiving member 70. And the liquid received by the water receiving part 72 is drained from the front end of the water receiving member 70 (discharge part 74) to the vehicle lower side.

  Here, the heat sink 38 of the gear housing 34 is arranged on one side (motor rear side) in the worm orthogonal direction opposite to the side where the output shaft 56 is arranged with respect to the axis AL of the worm 52 (rotating shaft 28). The heat generated by the power system element 64A of the control unit 60 is radiated by the radiating fins 38A of the heat sink 38. Further, a water receiving member 70 is attached to the distal end side of the output shaft 56, and the water receiving member 70 is the worm orthogonal on the opposite side to the one side in the worm orthogonal direction with respect to the axis AL of the worm 52 (rotating shaft 28). It is arranged around the output shaft 56 on the other side in the direction (motor rear side). For this reason, the heat sink 38 and the water receiving member 70 are spaced apart from each other on one side and the other side in the worm orthogonal direction (motor longitudinal direction) with reference to the axis AL of the worm 52. Thereby, it is possible to suppress heat dissipation by the water receiving member 70 from being inhibited by the heat sink 38. Moreover, since the water receiving member 70 does not receive the heat radiated by the heat sink 38 directly, it is possible to suppress the water receiving member 70 from being deformed by the heat. As described above, it is possible to maintain the heat dissipation by the heat sink 38 while improving the mounting state of the water receiving member 70.

  Further, the arm head 12 is directly fixed to the output shaft 56 of the vehicle wiper motor 20. As a result, the output shaft 56 of the vehicle wiper motor 20 that fixes the wiper arm 11 is projected to the outside of the vehicle, so that the vehicle wiper motor 20 is easily exposed to water. However, both heat dissipation and waterproof properties for the vehicle wiper motor 20 are achieved. The water receiving member 70 can be effectively realized. That is, in the vehicle wiper device 10 in which the wiper arm 11 is directly fixed to the output shaft 56, the vehicle wiper motor 20 includes a control unit 60 for driving the motor body 22 to rotate forward and reverse. It is necessary to dissipate heat. Further, in such a vehicle wiper device 10, the output shaft 56 is disposed so as to protrude from the cowl louver 90 of the vehicle V, so that it is necessary to ensure waterproofness with respect to the vehicle wiper motor 20. Then, according to the present embodiment, as described above, the heat sink 38 and the water receiving member 70 are spaced apart from one side and the other side in the worm orthogonal direction with respect to the axis AL of the worm 52. Therefore, it is possible to effectively realize both heat dissipation and waterproofness in the vehicle wiper motor 20.

  Further, a waterproof wall 82 is provided at the mounting end portion 78 </ b> A of the water receiving member 70, and the waterproof wall 82 is disposed between the output shaft 56 and the skirt portion 14 </ b> B of the arm head 12. For this reason, what is called a labyrinth (maze) structure is comprised by the skirt part 14B and the waterproof wall 82 inside the skirt part 14B. Thereby, for example, liquid such as water that has entered the inside of the vehicle V from the arrangement hole 92A of the cowl louver 90 can be prevented from entering the inside of the waterproof wall 82 from the open end of the skirt portion 14B. As a result, it is possible to prevent or suppress the output shaft 56 disposed inside the waterproof wall 82 from being wetted by the liquid.

  Further, the waterproof wall 82 is formed in a substantially C-shape opened to the front side of the vehicle when viewed from the front end side of the output shaft 56, and the output shaft 56 is disposed on the opening 82 </ b> A side of the waterproof wall 82. . For this reason, even when a liquid such as water temporarily enters the inside of the waterproof wall 82, the liquid flows from the opening 82 </ b> A to the outside of the waterproof wall 82 without being accumulated inside the waterproof wall 82 due to the inclination, and covers the cover 78. And flows to the upper surface of the receiving portion 72A. Thereby, the liquid can be drained from the front end of the slope portion 74A to the vehicle lower side via the receiving portion 72A and the slope portion 74A.

  Further, when viewed from the distal end side (motor upper side) of the output shaft 56, the distal end portion of the connector 66 protrudes toward the axial direction one side of the rotary shaft 28 with respect to the water receiving member 70. For this reason, when connecting an external connector to the connector 66, both can be connected while confirming the connection state. Thereby, even when the water receiving member 70 is provided in the vehicle wiper motor 20, it is possible to suppress a decrease in workability when an external connector is connected to the connector 66.

  In the present embodiment, the water receiving member 70 is made of rubber. However, the water receiving member 70 may be made of an elastomer, a resin, or the like, and is formed by two-color molding of an elastomer (rubber) and a resin material. It may be configured. For example, when the water receiving member 70 is formed by two-color molding of an elastomer (rubber) and a resin material, the cover 78 and the waterproof wall 82 are made of elastomer (rubber) and the other parts are made of resin. It may be configured.

  Further, in the present embodiment, the waterproof wall 82 is formed in a substantially C shape opened to the front side of the vehicle when viewed from the front end side (motor upper side) of the output shaft 56, but the shape of the waterproof wall 82 is Not limited to this. For example, the waterproof wall 82 may be formed in a substantially U shape opened to the front side of the vehicle.

  Moreover, you may change suitably the external shape of the water receiving member 70 in planar view corresponding to various vehicles. That is, the outer shape of the water receiving member 70 may be changed as appropriate so that the water receiving member 70 and the heat sink 38 do not overlap when viewed from the front end side (motor upper side) of the output shaft 56.

DESCRIPTION OF SYMBOLS 11 ... Wiper arm, 12 ... Arm head, 14 ... Fixed part, 20 ... Wiper motor for vehicles, 22 ... Motor main body, 28 ... Rotating shaft, 32 ... Housing, 38 .. Heat sink, 50... Deceleration mechanism, 52... Worm, 56... Output shaft, 60... Control unit, 70.・ Waterproof wall, 82A ... opening

Claims (4)

A speed reduction mechanism configured to include a worm that rotates integrally with a rotation shaft of a motor body, and an output shaft that is drivingly connected to the worm;
A control unit for controlling rotation of the motor body;
A housing for housing the control unit and the speed reduction mechanism and supporting the output shaft;
The control unit is formed on the housing and is disposed on one side of the worm orthogonal direction which is orthogonal to the worm axis and opposite to the side where the output shaft is disposed. A heat sink that dissipates heat,
A water receiving member mounted on the distal end side of the output shaft and disposed around the output shaft on the other side in the worm orthogonal direction opposite to the worm orthogonal direction one side with respect to the worm axis;
Wiper motor for vehicles equipped with.   2. The vehicle wiper motor according to claim 1, wherein an arm head constituting a wiper arm is directly fixed to the output shaft. The arm head has a fixing portion fixed to the output shaft, and the fixing portion is formed in a cylindrical shape that opens to the proximal end side of the output shaft and surrounds the output shaft.
The water receiving member has a mounting end portion in which an insertion hole that is inserted into the output shaft is formed inside the fixed portion, and between the output shaft and the fixed portion, from the mounting end portion. The vehicle wiper motor according to claim 2, further comprising a waterproof wall formed so as to protrude toward the tip end side of the output shaft. The waterproof wall is formed in a concave shape opened to the front side of the vehicle when viewed from the axial direction of the output shaft,
The vehicle wiper motor according to claim 3, wherein the output shaft is disposed on an opening side of the waterproof wall.