JP2007237941A - Wiper device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device for a vehicle devised capable of preventing entering of rain water, etc. from a vent hole even when the vent hole provided on a gear case is made to open upward. <P>SOLUTION: A pivot holder to support a wiper shaft on which a wiper arm is mounted free to rotate and a motor bracket 33 on which a wiper motor 21 to oscillate and drive the wiper shaft is fixed are connected to each other by a frame. A motor body and a speed reducer 23 are provided on the wiper motor 21, an upward projected peripheral wall part 62 is provided on a gear case 25 of the speed reducer 23 and the vent hole 61 to communicate inside and outside of the gear case 25 is opened on a head end part of the peripheral wall part 62. Additionally, a surrounding part 63 furnished with a recessed part 63a and a waterproofing wall part 63b is provided on the motor bracket 33, and consequently, it is possible to prevent entering of the rain water, etc. into the inside of the gear case 25 from the vent hole 61 by surrounding the head end part and an outer peripheral surface of the peripheral wall part 62 by this surrounding part 63. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle wiper device in which a windshield glass of a vehicle is wiped by swinging a wiper shaft to which a wiper arm is attached by a motor.

  A vehicle such as an automobile is provided with a wiper device for wiping off deposits such as rain, fog, snow, and splashes from the front car, which are attached to the windshield glass. Such a wiper device has a wiper arm to which a wiper blade is mounted at the tip, and a wiper shaft to which the wiper arm is attached. The wiper shaft is connected to a wiper motor via a link mechanism. The wiper motor has a motor body such as an electric motor and a speed reducer fixed to the motor body. A speed reduction mechanism is accommodated in the gear case of the speed reducer, and the rotation of the motor body is reduced to a predetermined number of rotations by the speed reduction mechanism. Then, it is transmitted to the link mechanism. Thus, when the wiper motor is operated, the wiper shaft is driven to swing by the wiper motor, and the wiper blade swings on the glass surface to wipe the glass surface.

  As a wiper device having two wiper arms such as a tandem type and a counter-wiping type, each pivot holder that rotatably supports a pair of wiper shafts corresponding to each wiper arm and the wiper motor are connected by a pipe-shaped frame. A so-called frame-integrated type (modular type) is known. In this case, the wiper motor is fixed to the motor bracket, and is fixed to the approximate center of the frame via the motor bracket.

By the way, in a wiper motor including a motor main body and a speed reducer, when the air in the gear case is heated due to heat generation of the motor main body, an air pressure difference is generated inside and outside the gear case, which places a burden on the seal member of the gear case. Therefore, for example, in the wiper motor disclosed in Patent Document 1, a vent hole that opens upward is provided in the gear case, and the inside and outside of the gear case are communicated with each other by the vent hole so as to eliminate the pressure difference.
JP 2005-137092 A

  However, in the wiper motor as shown in Patent Document 1, since the vent hole provided in the gear case is opened upward, when rain water or the like scatters toward the wiper motor, rain water or the like enters the gear case from the vent hole. Could intrude.

  An object of the present invention is to provide a vehicle wiper device that can prevent rainwater and the like from entering from a vent hole even if the vent hole provided in the gear case is opened upward.

  A vehicle wiper device according to the present invention includes a wiper shaft to which a wiper arm is attached, a wiper motor that swings and drives the wiper shaft, a pivot holder that rotatably supports the wiper shaft, and a motor bracket to which the wiper motor is fixed. A wiper device for a vehicle having a frame to be coupled and wiping a windshield glass of the vehicle, wherein the wiper motor is provided on the wiper motor and decelerates and outputs the rotation of the motor main body; and above the gear case of the reducer And a peripheral wall portion that is formed so as to project toward the inside and that has a vent hole that communicates the inside and outside of the gear case, and a surrounding portion that is formed in the motor bracket and surrounds the front end portion of the peripheral wall portion.

  In the vehicle wiper device according to the present invention, the surrounding portion includes a waterproof wall portion that is formed to protrude from the motor bracket and surrounds an outer peripheral surface of the peripheral wall portion.

  According to the present invention, since the front end portion of the peripheral wall portion where the vent hole is opened is surrounded by the surrounding portion formed in the motor bracket, it is possible to prevent rainwater or the like from entering the gear case from the vent hole.

  In addition, according to the present invention, since the wall portion surrounding the outer peripheral surface of the peripheral wall portion is provided in the motor bracket, the intrusion of rainwater and the like is prevented by the intricate shape of the peripheral wall portion and the waterproof wall, and the air hole is inserted. Intrusion of rainwater or the like can be prevented more effectively.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram showing an outline of a vehicle wiper device according to an embodiment of the present invention. The vehicle 11 shown in FIG. 1 is wiped with rainwater or the like adhering to a windshield 12 as a windshield glass. Therefore, a vehicle wiper device 13 (hereinafter referred to as a wiper device 13) is provided. The wiper device 13 has a wiper shaft 14a on the driver's seat side, that is, on the DR side, and a wiper shaft 14b on the passenger side, that is, on the AS side, disposed on the left and right sides of the vehicle body 11a. The wiper arm 15a on the driver's seat side, that is, the DR side, is attached at the base end portion, and the wiper shaft 15b on the AS side, the wiper arm 15b on the passenger seat side, that is, the AS side, is attached at the base end portion. A wiper blade 16a on the driver's seat side, that is, the DR side, is attached to the distal end portion of the wiper arm 15a on the DR side, and a wiper blade 16b on the passenger side, that is, the AS side, is attached to the distal end portion of the wiper arm 15b on the AS side. These wiper blades 16a and 16b are urged by a spring member (not shown) built in the wiper arms 15a and 15b and elastically contact the windshield 12. The wiper arms 15a, 15b swing around the wiper shafts 14a, 14b between the lower inversion position on the lower center side of the windshield 12 and the upper inversion positions on the left and right sides of the windshield 12, thereby The wiper blades 16a and 16b perform a wiping operation on the wiping ranges 12a and 12b on the windshield 12 to wipe the glass surface. Further, in the resting state, as indicated by a two-dot chain line in FIG. 1, the wiper blades 16a and 16b are stopped at the lower inversion position with the DR-side wiper blade 16a being close to the top and bottom. Thus, the wiping pattern of the wiper device 13 is a counter wiping type in which the DR-side wiper arm 15a and the AS-side wiper arm 15b are wiping each other.

  FIG. 2 is a perspective view showing the details of the wiper device shown in FIG. 1. This wiper device 13 includes a pivot holder 17a on the driver's seat side that supports the DR side wiper shaft 14a in a freely rotatable manner, that is, the DR side pivot holder 17a, And a pivot holder 17b on the passenger side, that is, the AS side, which rotatably supports the wiper shaft 14b. The DR side pivot holder 17a is provided with three mounting legs 18a, 18b, 18c, and the DR side pivot holder 17a is fixed to the vehicle body 11a by bolts (not shown) at these mounting legs 18a, 18b, 18c, Thus, the DR-side wiper shaft 14a is positioned on the vehicle body 11a. Similarly, the AS-side pivot holder 17b is provided with two mounting legs 19a and 19b, and the AS-side pivot holder 17b is fixed to the vehicle body 11a by bolts (not shown) at these mounting legs 19a and 19b. As a result, the AS-side wiper shaft 14b is positioned on the vehicle body 11a.

  A wiper motor 21 is provided in the wiper device 13 in order to swing the wiper shafts 14a and 14b.

  3 is a side view showing the details of the wiper motor shown in FIG. 2, FIG. 4 is a front view showing the internal structure of the reduction gear shown in FIG. 3, and as shown in FIG. Motor). The motor main body 22 is a so-called brushed DC motor, and when a wiper switch (not shown) is turned on, a DC current is supplied from a power supply (not shown) such as an on-vehicle battery to operate.

  A reduction gear 23 is fixed to the motor main body 22, and the rotation of the motor main body 22 is reduced to a predetermined number of rotations by the reduction gear 23 and output from the output shaft 24. As shown in FIG. 4, the speed reducer 23 includes an aluminum die-cast gear case 25 and a speed reduction mechanism 26 accommodated in the gear case 25, and the speed reduction mechanism 26 includes a motor body 22 that projects into the gear case 25. A pair of worms 27a, 27b formed on the outer peripheral surface of the rotating shaft 22a in opposite directions, a pair of worm wheels 28a, 28b meshing with the worms 27a, 27b, and the worm wheels 28a, 28b are integrally provided. A pair of pinions 29a and 29b and an output gear 31 meshing with these pinions 29a and 29b are provided, and the rotation of the rotary shaft 22a is decelerated in two stages and output from the output shaft 24. Further, a cam plate (not shown) is mounted on the rear surface of the output gear 31, and control such as automatic stop of the wiper motor 21 is mechanically performed by the cam plate.

  In the case shown in the figure, a DC motor with a brush is used as the motor body 22 and its operation control is mechanically controlled using a cam plate (not shown). For example, another type of motor such as a brushless motor may be used as the motor main body 22, and its operation control may be performed by a control device including a CPU, a memory, and the like.

  As shown in FIG. 2, one end of a frame 32 formed of a pipe material is fixed to the AS-side pivot holder 17b, and a motor bracket 33 is fixed to the other end of the frame 32. A wiper motor 21 is fixed to the bracket 33. That is, the motor bracket 33 to which the wiper motor 21 is fixed and the AS-side pivot holder 17b are connected by the frame 32, whereby the wiper motor 21 and the AS-side pivot holder 17b are sub-unitized.

  FIG. 5 is a perspective view showing details of the motor bracket shown in FIG. 2, and FIG. 6 is a side view showing a state where the wiper motor is attached to the motor bracket.

  The motor bracket 33 is formed by aluminum die casting, and has a frame fixing portion 34 formed in a semi-cylindrical shape as shown in FIG. 5, and as shown in FIG. The frame 32 is fixed. The motor bracket 33 is provided with a motor fixing portion 36 integrally with the frame fixing portion 34. The motor fixing portion 36 is provided with three attachment holes 37. As shown in FIG. 3, the reduction gear 23 of the wiper motor 21 is provided with three attachment feet 38. As shown in FIG. The motor bracket 33 is fixed to the motor bracket 33 by bolts 39 screwed to the mounting legs 38 through the mounting holes 37 of the motor fixing portion 36. Further, the motor bracket 33 is provided with a mounting leg portion 41 protruding from the motor fixing portion 36, and the mounting leg portion 41 is fixed to the vehicle body 11a by a bolt (not shown). Further, the motor bracket 33 is provided with a support leg portion 42 protruding from the motor fixing portion 36, and a convex portion 43 provided at the tip of the support leg portion 42 is inserted into a support hole (not shown) formed in the vehicle body 11a. Thus, the motor bracket 33 is supported by the vehicle body 11a by the support leg portion 42.

  As shown in FIG. 5, a through hole 44 is formed in the motor mounting portion, and the output shaft 24 of the wiper motor 21 projects to the back side of the motor bracket 33 through the through hole 44, and the back side of the motor bracket 33 of the wiper motor 21. An output arm 45 is fixed to the front end of the output shaft 24 protruding by a nut 46. As a result, when the motor body 22 is activated, the output arm 45 rotates about the output shaft 24.

One end of a DR side drive rod 47a is rotatably connected to the tip of the output arm 45 by a ball joint (spherical joint), and the other end of the DR side drive rod 47a is connected to the DR as shown in FIG. The DR-side drive lever 48a fixed to the wiper shaft 14a is rotatably connected by a ball joint (spherical joint). Further, an intermediate bracket 51 is fixed to an intermediate portion of the frame 32, and an intermediate link 52 formed in a V shape having two connecting portions 52 a and 52 b rotates about the support shaft 53. It is supported freely. One end of the intermediate rod 54 is rotatably connected to one connecting portion 52 a of the intermediate link 52 by a ball joint (spherical joint), and the other end of the intermediate rod 54 is connected to the tip of the output arm 45. It is rotatably connected by (spherical joint).
Further, one end of the AS side drive rod 47b is rotatably connected to the other connecting portion 52b of the intermediate link 52 by a ball joint (spherical joint), and the other end of the AS side drive rod 47b is connected to the AS side wiper shaft. The AS drive lever 48b fixed to 14b is rotatably connected by a ball joint (spherical joint). As a result, when the wiper motor 21 is actuated to rotate the output arm 45, the rotation is transmitted via the drive rods 47a, 47b, the intermediate rod 54, the intermediate link 52, etc., and the drive levers 48a, 48b, that is, the wiper shafts. 14a and 14b will swing. Thus, the DR-side wiper shaft 14a and the AS-side wiper shaft 14b are connected to the wiper motor 21 via the drive rods 47a and 47b, the intermediate rod 54, the intermediate link 52, the drive levers 48a and 48b, and the like. The wiper motor 21 is driven to swing.

  7 is a plan view of the gear case shown in FIG. 3 as viewed from above, and FIG. 8 is a cross-sectional view showing details of the air holes formed in the gear case.

  As shown in FIGS. 3 and 7, the gear case 25 of the speed reducer 23 is formed with a vent hole 61 in order to absorb a change in atmospheric pressure generated in the gear case 25 and the motor body 22. The vent hole 61 is opened upward at the front end portion of the peripheral wall portion 62 that is integrally formed by projecting upward from the outer surface of the gear case 25 to the gear case 25 so that the inside and outside of the gear case 25 communicate with each other. It has become. That is, the air hole 61 penetrates from the bottom surface of the gear case 25 toward the tip of the peripheral wall portion 62. Thus, the air generated in the operation of the motor main body 22 heats the air inside the gear case 25 and the motor main body 22, and even if the heated air is cooled, the pressure difference between the inside and the outside of the gear case 25. Can be eliminated.

  In the wiper motor 21, the vent hole 61 is provided so as to open upward. Therefore, the motor bracket 33 is provided with the surrounding portion 63. It surrounds and prevents rainwater or the like from entering the inside of the gear case 25 from the vent hole 61.

  As shown in FIG. 8, the surrounding portion 63 has a concave portion 63 a that is recessed in a circular shape on the surface of the motor bracket 33 on the side facing the speed reducer 23 of the wiper motor 21, and when the wiper motor 21 is fixed to the motor bracket 33, The front end portion of the peripheral wall portion 62 is opposed to the concave portion 63a. Thereby, the opening end of the vent hole 61 is covered with the concave portion 63a, and intrusion of rainwater or the like from the vent hole 61 is prevented by the concave portion 63a.

  Further, the surrounding portion 63 has a pair of waterproof wall portions 63b that are integrally formed to protrude from the motor bracket 33 toward the gear case 25, and these waterproof wall portions 63b are each formed in a wall shape having an arcuate cross section, It faces the outer peripheral surface of the peripheral wall 62 with a predetermined interval. That is, the waterproof wall portion 63b is disposed so as to surround the outer peripheral surface of the peripheral wall portion 62, thereby preventing rainwater or the like from being directly applied to the peripheral wall portion 62, and intrusion of rainwater or the like from the vent hole 61. Further effectively prevented.

  In the present embodiment, in order to escape the reinforcing ribs provided in the gear case 25, the respective waterproof wall portions 63b are formed in an arc shape. However, when the ribs are not provided in the gear case 25, etc. Alternatively, the waterproof wall 63b may be formed in a cylindrical shape and disposed outside the peripheral wall 62.

  As described above, in the wiper device 13, the surrounding portion 63 is provided in the motor bracket 33 to which the wiper motor 21 is fixed, and the opening end of the air hole 61 formed in the gear case 25 is surrounded by the surrounding portion 63. Even if the air holes 61 are opened upward, intrusion of rainwater or the like from the air holes 61 can be prevented.

  Further, since the waterproof wall 63b that protrudes from the motor bracket 33 and covers the outer peripheral surface of the peripheral wall 62 is provided on the surrounding part 63, rainwater or the like is applied to the tip of the peripheral wall 62 by the waterproof wall 63b. This can prevent the intrusion of rainwater or the like from the vent hole 61 more effectively.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the present embodiment, the present invention is applied to the counter-wiping type wiper device 13. However, the present invention is not limited to this. For example, the present invention is applied to a wiper device having another wiping pattern such as a tandem type. Also good.

  In the present embodiment, the frame 32 connects the AS side pivot holder 17b and the motor bracket 33. However, the present invention is not limited to this, and the DR side pivot holder 17a may also be connected. .

  Further, the peripheral wall portion may have any shape as long as it communicates upwardly between the gear case and the inside and outside of the gear case.

It is explanatory drawing which shows the outline of the wiper apparatus for vehicles which is one embodiment of this invention. It is a perspective view which shows the detail of the wiper apparatus shown in FIG. It is a side view which shows the detail of the wiper motor shown in FIG. It is a front view which shows the internal structure of the reduction gear shown in FIG. It is a perspective view which shows the detail of the motor bracket shown in FIG. It is a side view which shows the attachment state of the wiper motor to a motor bracket. It is the top view which looked at the gear case shown in FIG. 3 from the upper side. It is sectional drawing which shows the detail of the ventilation hole formed in the gear case.

Explanation of symbols

11 Vehicle 11a Car body 12 Windshield (windshield glass)
12a, 12b Wiping range 13 Vehicle wiper device 14a DR-side wiper shaft 14b AS-side wiper shaft 15a DR-side wiper arm 15b AS-side wiper arm 16a DR-side wiper blade 16b AS-side wiper blade 17a DR-side pivot holder 17b AS side pivot holder 18a, 18b, 18c Mounting leg 19a, 19b Mounting leg 21 Wiper motor 22 Motor body 22a Rotating shaft 23 Reducer 24 Output shaft 25 Gear case 26 Deceleration mechanism 27a, 27b Worm 28a, 28b Worm wheel 29a, 29b Pinion 31 Output gear 32 Frame 33 Motor bracket 34 Frame fixing portion 35 Bolt 36 Motor fixing portion 37 Mounting hole 38 Mounting foot 39 Bolt 41 Mounting leg portion 42 Supporting leg portion 43 Convex portion 44 Through hole 5 output arm 46 nut 47a DR side drive rod 47b AS side drive rod 48a DR side drive lever 48b AS side drive lever 51 intermediate bracket 52 intermediate link 52a, 52b connecting portion 53 support shaft 54 intermediate rod 61 vent hole 62 peripheral wall portion 63 surrounding Part 63a recessed part 63b waterproofing wall part

Claims (2)

A wiper shaft to which a wiper arm is attached; a wiper motor that swings and drives the wiper shaft; a pivot holder that rotatably supports the wiper shaft; and a frame that connects a motor bracket to which the wiper motor is fixed. A vehicle wiper device for wiping windshield glass,
A reducer that is provided in the wiper motor and decelerates and outputs the rotation of the motor body;
A peripheral wall portion that is formed to project upward from the gear case of the speed reducer and that has a vent hole that communicates the inside and outside of the gear case;
A vehicle wiper device, comprising: an enclosure portion formed on the motor bracket and surrounding a distal end portion of the peripheral wall portion.   2. The vehicle wiper device according to claim 1, wherein the surrounding portion includes a waterproof wall portion that protrudes from the motor bracket and surrounds an outer peripheral surface of the peripheral wall portion. 3.

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