JP2011102049A - Wiper device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance versatility of a flooding preventive cover, by enhancing flooding preventive performance to a connecting part between a driving link and a connecting rod by the flooding preventive cover. <P>SOLUTION: The flooding preventive cover 41 is arranged in a vehicular wiper device 15 having a link mechanism constituted of a driving link 32 fixed to an output shaft of a wiper motor 22, a driven link fixed to a pivot shaft and the connecting rod for connecting the driving link 32 and the driven link. This flooding preventive cover 41 is fixed to an under surface of a reduction gear 25b (a motor body 25) of projecting the output shaft so as to be positioned between the motor body 25 and the driving link 32, to prevent rainwater from splashing on a ball joint 36a being the connecting part between the driving link 32 and the connecting rod by this flooding preventive cover 41. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle wiper device that is mounted on a vehicle such as an automobile and wipes a windshield glass of the vehicle.

  Vehicles such as automobiles are provided with a vehicle wiper device for wiping off deposits such as rainwater and snow adhering to the windshield glass and the like to ensure visibility of the driver.

  A vehicle such as an automobile normally includes two wiper arms on the driver's seat side and the passenger seat side, and the wiper device includes a pair of pivot shafts corresponding to each wiper arm. As a wiper device having a pair of pivot shafts, a so-called modular type device is known in which a pivot holder that rotatably supports each pivot shaft is connected by a frame, and a wiper motor is fixed to the frame to form one unit. It has been. In this case, in order to transmit power from the wiper arm to each pivot shaft, a link mechanism is provided between the output shaft of the wiper motor and each pivot shaft. The link mechanism includes a drive link fixed to the output shaft of the wiper motor and a driven link fixed to the pivot shaft. The drive link and the driven link are connected to each other by a connecting rod.

  Such a wiper device is usually mounted below the windshield glass, that is, below the vehicle body cowl, with the output shaft facing downward. Therefore, when rainwater that has traveled through the cowl flows toward the wiper device, rainwater or the like is applied to the connecting portion between the drive link and the connecting rod, and grease from the ball joint of the connecting rod flows out together with the rainwater. Will drop.

  For this reason, for example, in the wiper device disclosed in Patent Document 1, a water-proof cover that covers the wiper motor from above is attached to the frame. I try to prevent that.

JP 2008-184041 A

  However, in the wiper device shown in Patent Document 1, since the water-proof cover is attached so as to cover the upper part of the wiper motor, the distance from the water-proof cover to the connecting portion between the drive link and the connecting rod becomes large. There is a risk that rainwater that has traveled through the water-proofing cover may enter the inside of the cover and be applied to the connecting portion between the drive link and the connecting rod.

  Further, in the wiper device disclosed in Patent Document 1, since the moisture prevention cover is attached to the frame, a plurality of shapes differ depending on a plurality of wiper devices having different positional relationships between the frame and the wiper motor. It was necessary to prepare a water-proof cover, and its versatility was low.

  An object of the present invention is to enhance the ability to prevent water from being applied to the connecting portion between the drive link and the connecting rod by the water-proof cover.

  Another object of the present invention is to increase the versatility of the moisture prevention cover.

  A vehicle wiper device according to the present invention is a vehicle wiper device mounted on a vehicle, a pivot holder fixed to a frame, a pivot shaft rotatably supported by the pivot holder, and attached with a wiper arm; A wiper motor having a motor main body fixed to the frame and an output shaft protruding downward from the motor main body, a drive link fixed to the output shaft, a driven link fixed to the pivot shaft, and the drive A link mechanism having a connecting rod connected to the link and the driven link, and a connecting portion between the drive link and the connecting rod, which is disposed between the motor body and the drive link and fixed to the wiper motor. And a moisture prevention cover that covers the water.

  The vehicle wiper device according to the present invention is characterized in that the moisture prevention cover is formed in a disc shape.

  The vehicle wiper device according to the present invention is characterized in that the water-preventing cover is formed in a fan shape.

  The wiper device for a vehicle according to the present invention is characterized in that the moisture prevention cover is fixed to the motor body.

  The wiper device for a vehicle according to the present invention is characterized in that the moisture prevention cover is fixed to the output shaft.

  According to the present invention, the moisture prevention cover for preventing rainwater or the like from being applied to the connecting portion between the drive link and the connecting rod is disposed between the motor body and the drive link and is fixed to the wiper motor. Therefore, compared with the case where the moisture prevention cover is disposed above the motor body, the distance from the moisture prevention cover to the connecting portion between the drive link and the connecting rod is narrowed so that the moisture prevention cover is connected to the drive link. It is possible to improve the water-proofing performance to the connecting portion with the rod.

  In addition, since the moisture prevention cover is fixed to the wiper motor instead of the frame, the same moisture prevention cover can be used for a plurality of types of wiper devices having different positional relationships between the frame and the wiper motor. it can.

It is a front view which shows the windshield glass periphery of the vehicle by which the vehicle wiper apparatus which is one embodiment of this invention is mounted. It is a front view which shows the detail of the wiper apparatus for vehicles shown in FIG. It is sectional drawing which follows the AA line in FIG. It is a disassembled perspective view which shows the attachment structure of the waterproof cover and drive link to a wiper motor. It is the figure which looked at the wiper device for vehicles shown in Drawing 2 from the lower side. FIG. 6 is an exploded perspective view showing a modification of the vehicle wiper device shown in FIGS. 2 to 5 and a case where the water-proof cover is formed in a fan shape corresponding to the swing type wiper motor. It is sectional drawing of the position corresponding to FIG. 3 of the vehicle wiper apparatus shown in FIG. FIG. 6 is an exploded perspective view showing a modified example of the vehicle wiper device shown in FIGS. 2 to 5, in which a moisture prevention cover is fixed to the output shaft of the wiper motor. It is sectional drawing of the position corresponding to FIG. 3 of the wiper apparatus for vehicles shown in FIG. It is a disassembled perspective view which shows the modification of the moisture prevention cover shown in FIG.

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

  The vehicle 11 shown in FIG. 1 is provided with two wiper arms 12a and 12b on the driver's seat side and the passenger seat side, and wiper blades 13a and 13b are attached to the tips of these wiper arms 12a and 12b, respectively. A vehicle wiper device 15 (hereinafter referred to as a wiper device 15) is provided in the vehicle 11 in order to wipe the rain water and the like adhering to the windshield glass (front glass) 14 by swinging and driving the wiper arms 12a and 12b within a predetermined angle range. Is installed).

  2 is a front view showing the details of the vehicle wiper device shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a structure for attaching a water-proof cover and a drive link to the wiper motor. FIG. 5 is a view of the vehicle wiper device shown in FIG. 2 as viewed from below.

  As shown in FIG. 2, the wiper device 15 is a so-called modular type in which a pair of pivot holders 21a and 21b and a wiper motor 22 are integrated by a frame 23, and is provided below the windshield glass 14 of the vehicle body 11a. It arrange | positions at the lower part of the provided cowl 11b.

  The frame 23 is a pipe frame formed by a pipe having a circular cross section. One pivot holder 21 a is fixed to one end of the frame 23 by caulking, and the other pivot holder 21 b is fixed to the other end of the frame 23 by caulking. ing. Further, the wiper motor 22 is fixed to a substantially central portion of the frame 23 in the longitudinal direction.

  Pivot shafts 24a and 24b are rotatably supported by the pivot holders 21a and 21b, respectively, and the ends of the pivot shafts 24a and 24b protrude from the cowl 11b toward the outside of the vehicle body 11a. Each wiper arm 12a, 12b is attached to the tip end portion of the corresponding pivot shaft 24a, 24b protruding from the cowl 11b, and rotates or swings in a predetermined angular range together with the pivot shaft 24a, 24b around the pivot shaft 24a, 24b. It comes to move.

  The wiper motor 22 is a drive source for the wiper device 15 and includes a motor body 25 and an output shaft 26. The motor body 25 includes an electric motor 25a and a speed reducer 25b, and these are an electric motor with a speed reducer that is a single unit. The reduction gear 25b includes a gear case 25b1 that houses a reduction mechanism (not shown) therein, and the output shaft 26 is provided so as to protrude from the gear case 25b1. The wiper motor 22 is a one-way rotation type. When a wiper switch (not shown) is turned on to operate the electric motor 25a, the rotation of the electric motor 25a is decelerated by the speed reducer 25b and transmitted to the output shaft 26, and the output The shaft 26 rotates continuously in a predetermined direction.

  The gear case 25b1 of the speed reducer 25b is integrally provided with a mounting portion 25b2 having a semi-cylindrical cross section. The inner peripheral surface of the mounting portion 25b2 is formed in a shape corresponding to the outer peripheral surface of the frame 23, and the wiper motor 22 is engaged by a fastening member such as a bolt (not shown) with the mounting portion 25b2 engaged with the frame 23. The motor body 25 is fixed to the frame 23. That is, the wiper motor 22 has a structure in which the motor body 25 is directly fixed to the frame 23 without using other members such as a bracket. When the wiper motor 22 is attached to the frame 23, the output shaft 26 projects downward from the lower surface of the vehicle 11 from the lower surface of the speed reducer 25b, that is, the gear case 25b1.

  A link mechanism 31 is provided between the output shaft 26 and each pivot shaft 24a, 24b in order to convert the rotation of the output shaft 26 into a swinging motion and transmit it to each pivot shaft 24a, 24b. As shown in FIGS. 2 to 5, the link mechanism 31 includes a drive link 32, a pair of driven links 33 a and 33 b, and a pair of connecting rods 34 a and 34 b. The drive link 32 is formed of a plate material such as a steel plate, and is fixed to the distal end of the output shaft 26 by a nut 35 at the base end portion thereof, and rotates together with the output shaft 26 when the wiper motor 22 is operated. The driven links 33a and 33b are each formed of a plate material such as a steel plate, and are respectively fixed to the base end portions of the corresponding pivot shafts 24a and 24b by caulking or the like. The pivot shaft 24a is centered on the corresponding pivot shafts 24a and 24b. , 24b are rotated or oscillated within a predetermined angle range.

  The connecting rods 34a and 34b are each formed in a rod shape having ball joints 36a, 36b, 37a and 37b at both ends. One end of one connecting rod 34a is rotatably connected to the tip end of the drive link 32 by a ball joint 36a, and the other end is rotatably connected to the tip end of one driven link 33a by a ball joint 36b. One end of the other connecting rod 34b is rotatably connected to the tip of the drive link 32 by a ball joint 37a, and the other end is rotatably connected to the tip of the other driven link 33b by a ball joint 37b. . At the front end of the drive link 32, the ball joints 36a and 37a of the respective connecting rods 34a and 34b are coaxially stacked and fixed to the drive link by a single bolt 38 that passes through the ball joints 36a and 37a. Has been.

  In order to prevent rainwater or the like from being applied to the connecting portions of the drive link 32 and the connecting rods 34a and 34b, that is, the ball joints 36a and 37a, the wiper device 15 is provided with a moisture prevention cover 41. The water-proof cover 41 is made of resin, the main body 41a is formed in a disc shape, and a through hole 41b is provided at the center of the main body 41a. Further, the moisture prevention cover 41 is provided with a relief portion 41c having a U-shaped cross section integrally with the main body portion 41a. The relief portion 41c has an inner diameter slightly larger than the outer diameter of the frame 23. Yes.

  As shown in FIG. 4, the moisture prevention cover 41 is fixed to the lower surface of the speed reducer 25 b of the wiper motor 22 by three bolts 42 before the drive link 32 is fixed to the output shaft 26 of the wiper motor 22. At this time, the output shaft 26 is inserted into the through hole 41 b, and the escape portion 41 c is disposed along the frame 23 so as to cover the outside of the frame 23. When the waterproof cover 41 is fixed to the lower surface of the speed reducer 25b, the drive link 32 is then fixed to the tip of the output shaft 26. As a result, the water-preventing cover 41 fixed to the lower surface of the speed reducer 25b is placed between the speed reducer 25b, that is, the motor body 25 and the drive link 32, in parallel with the lower surface of the speed reducer 25b. .

  The outer diameter D1 of the main body portion 41a of the moisture prevention cover 41 disposed between the motor main body 25 and the drive link 32 is a connection portion between the drive link 32 and the connection rods 34a and 34b with the output shaft 26 as the center. The diameter is larger than the diameter D2 of the movement path (shown by a one-dot chain line in FIG. 5) of a certain ball joint 36a, 37a. As a result, the upper side of the drive link 32 is always covered with the moisture prevention cover 41.

  Therefore, even if rainwater or the like transmitted through the cowl 11b of the vehicle body 11a flows into the wiper motor 22, the ball joints 36a and 36b, which are the connecting portions of the drive link 32 and the connecting rods 34a and 34b, are covered with water. Since it is always covered by the prevention cover 41, the rainwater is removed by the prevention cover 41 from the outside of the movement path of the ball joints 36a and 36b, and does not reach the ball joints 36a and 36b.

  Thereby, it is possible to prevent the lubricant such as grease applied to the ball joints 36a and 37a from flowing into the rain water and the like, and to improve the operation reliability of the wiper device 15. Further, since the water-preventing cover 41 is fixed to the lower surface of the speed reducer 25b and is disposed between the speed reducer 25b (the motor main body 25) and the drive link 32, the water-proof preventing cover 41 is attached to the motor main body 25. Compared with the case where it arrange | positions upwards, the space | interval of the moisture prevention cover 41 and the drive link 32 is narrow. Thereby, it is possible to effectively prevent rainwater applied to the water-preventing cover 41 from entering the ball joints 36a and 37a from the edge of the cover to the inside.

  As described above, in the wiper device 15, the water-proof preventing cover 41 for preventing the rainwater or the like from being applied to the ball joints 36 a and 37 a that are the connecting portions of the drive link 32 and the connecting rods 34 a and 34 b is provided with the output shaft 26 is fixed to the lower surface of the speed reducer 25b (motor body 25) from which the projection 26 is disposed, and the water-proof cover 41 is disposed between the motor body 25 and the drive link 32. The interval between the ball joints 36a and 37a can be narrowed, and the moisture prevention performance of the moisture prevention cover 41 with respect to the ball joints 36a and 37a can be enhanced.

  Further, in this wiper device 15, the waterproof cover 41 is fixed not to the frame 23 but to the lower surface of the speed reducer 25 b of the wiper motor 22, so that there are a plurality of specification differences in which the positional relationship between the frame 23 and the wiper motor 22 is different. The same moisture prevention cover 41 can be used for the wiper apparatus regardless of the positional relationship. Therefore, the versatility of the waterproof cover 41 can be increased, and the cost of the wiper device 15 can be reduced thereby.

  6 is an exploded perspective view showing a modification of the wiper device shown in FIGS. 2 to 5 and showing a case where the water-proof cover is formed in a fan shape corresponding to the swing type wiper motor. FIG. It is sectional drawing of the position corresponding to FIG. 3 of the wiper apparatus shown in FIG.

  In the wiper device 15 shown in FIG. 2 to FIG. 5, the drive link 32 continuously rotates in only one direction together with the output shaft 26. A disc-shaped member having a diameter larger than that of the movement path of the ball joints 36a and 37a connected to each other is used.

  On the other hand, in the case shown in FIGS. 6 and 7, the wiper motor 22 is a swing type that swings the output shaft 26, that is, the drive link 32 within a predetermined angle range. As the water prevention cover 41, a fan-shaped (semi-circular) shape having an angle range corresponding to the swing range of the drive link 32 is used. That is, the water-preventing cover 41 is formed in a fan shape that covers the upper part of the movement range of the ball joints 36 a and 37 a accompanying the swinging motion of the drive link 32. As a result, when a swing type motor is used as the wiper motor 22, the water protection cover 41 can be made as small as necessary, and the cost of the wiper device 15 can be reduced.

  FIG. 8 is an exploded perspective view showing a modification of the wiper device shown in FIGS. 2 to 5 and showing a case where a moisture prevention cover is fixed to the output shaft of the wiper motor, and FIG. 9 is a wiper shown in FIG. It is sectional drawing of the position corresponding to FIG. 3 of an apparatus, FIG. 10: is a disassembled perspective view which shows the modification of the moisture prevention cover shown in FIG.

  In the wiper device 15 shown in FIG. 2 to FIG. 5, a water prevention cover 41 formed in a disk shape is fixed to the lower surface of the speed reducer 25 b of the wiper motor 22, that is, the motor body 25.

  On the other hand, in the case shown in FIGS. 8 and 9, the moisture prevention cover 41 is fixed to the output shaft 26. In this case, the water-preventing cover 41 is formed in a disc shape in which the escape portion 41c is not provided, and an attachment hole 41d is provided in the axis. On the other hand, a retaining ring 43 is fixed to the output shaft 26, and the waterproof cover 41 is inserted into the output shaft 26 through the mounting hole 41 d, and is sandwiched between the retaining ring 43 and the drive link 32 and fixed to the output shaft 26. Has been. The moisture prevention cover 41 fixed to the output shaft 26 rotates together with the output shaft 26 and can always cover the upper side of the drive link 32. In this case, as shown in FIG. 10, the water prevention cover 41 may be formed in a fan shape that covers the upper side of the drive link 32 instead of the disk shape. 8 and 10, the water-proof preventing cover 41 may be fixed to the drive link 32 with a bolt or the like.

  As described above, the structure for fixing the moisture-preventing cover 41 to the output shaft 26 is applicable to any wiper device including a wiper device including a one-way rotation type wiper motor and a wiper device including a swing type wiper motor. be able to.

  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 above-described embodiment, the moisture prevention cover 41 is formed in a disk shape or a fan shape, but the shape is not limited to this as long as the upper portion of the drive link 32 can be covered.

  Moreover, in the said embodiment, although the water-proof prevention cover is fixed to the lower surface of the reduction gear 25b with a volt | bolt, it is not fixed to this, For example, it fixes to the motor main body 25, such as fixing to the electric motor 25a. If so, the fixing location and fixing structure are not limited.

  Furthermore, in the embodiment, the pair of connecting rods 34a and 34b corresponding to the pair of driven links 33a and 33b are connected to the drive link 32. It is good also as a structure which connects only this connection rod 34a, and connects each driven link 33a, 33b with another connection rod 34b.

DESCRIPTION OF SYMBOLS 11 Vehicle 11a Car body 11b Cowl 12a, 12b Wiper arm 13a, 13b Wiper blade 14 Windshield glass 15 Vehicle wiper device 21a, 21b Pivot holder 22 Wiper motor 23 Frame 24a, 24b Pivot shaft 25 Motor main body 25a Electric motor 25b Gearbox 25b1 Gear 25b1 Mounting part 26 Output shaft 31 Link mechanism 32 Drive link 33a, 33b Driven link 34a, 34b Connecting rod 35 Nut 36a, 36b Ball joint 37a, 37b Ball joint 38 Bolt 41 Water-proof cover 41a Body part 41b Through hole 41c Escape part 41d Mounting hole 42 Bolt 43 Retaining ring D1 Outer diameter D2 Diameter

Claims (5)

A vehicle wiper device mounted on a vehicle,
A pivot holder fixed to the frame;
A pivot shaft rotatably supported by the pivot holder and to which a wiper arm is attached;
A wiper motor comprising a motor body fixed to the frame and an output shaft projecting downward from the motor body;
A link mechanism including a drive link fixed to the output shaft, a driven link fixed to the pivot shaft, and a connecting rod connected to the drive link and the driven link;
A vehicle wiper device, comprising: a moisture prevention cover that is disposed between the motor body and the drive link and is fixed to the wiper motor and covers a connection portion between the drive link and the connection rod.   2. The vehicle wiper device according to claim 1, wherein the waterproof cover is formed in a disc shape.   2. The vehicle wiper device according to claim 1, wherein the moisture prevention cover is formed in a fan shape.   4. The vehicle wiper device according to claim 1, wherein the moisture prevention cover is fixed to the motor body. 5.   4. The vehicle wiper device according to claim 1, wherein the moisture prevention cover is fixed to the output shaft. 5.

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