JP2007185975A - Wiper device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device capable of preventing a wiper shaft from rotating beyond a dead point of a link mechanism if a load in a rotary direction is applied. <P>SOLUTION: A DR-side pivot holder 17a is fixed to a vehicle body at mounting legs 18a-18c, and a DR-side wiper shaft 14a mounted to the DR-side wiper arm is rotatably supported by a DR-side pivot holder 17a. Also, a DR-side driving lever 48a is fixed to a base end of the DR-side wiper shaft 14a, and the DR-side driving lever 48a is connected with a wiper motor via the link mechanism. A stopper 61 projecting downward is installed to the mounting leg 18b, and a load in a rotary direction is applied to the DR-side wiper shaft 14a, so that the DR-side driving lever 48a moving toward the dead point beyond a predetermined range is brought into contact with the stopper 61 so as to restrain further movement. <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 shaft that is rotatably supported by a pivot holder. A wiper arm is attached to the tip of the wiper shaft, and a wiper blade that is in direct contact with the windshield glass is attached to the tip of the wiper arm. Has been. A drive lever is fixed to the base end portion of the wiper shaft, and the drive lever is connected to the wiper motor via a link mechanism. When the wiper motor is activated, the rotational motion is transmitted to the drive lever via the link mechanism, and the wiper shaft is driven to swing, whereby the wiper blade swings on the glass surface and wipes the glass surface. It is like that.

  As a wiper device having two wiper arms on the driver side and the passenger side, for example, as shown in Patent Document 1, the wiper shafts are arranged on the left and right sides of the vehicle body, and each wiper blade is windshielded. A counter-wiping type is known that swings between a lower inversion position on the lower center side of the glass and an upper inversion position on both left and right side portions.

In such a counter-wiping type wiper device, when the wiper is stopped, each wiper blade is placed in the lower center of the windshield glass with the wiper blade on the driver's seat facing up and down so that both wiper arms are in the lower position. If it starts to move from the reverse position at the same timing, both wiper blades may interfere with each other. Therefore, in the conventional wiper device, the link mechanism is set so that the movement start speed of the wiper arm on the driver's seat side is faster than the wiper arm on the passenger seat side, and interference between both wiper blades at the start of operation from the lower reverse position is achieved. I try to prevent it.
JP 2000-264169 A

  However, if the link is set so that the speed at which the movement starts from the lower reversal position is faster than the passenger seat side, the wiper shaft drive lever on the driver seat side and the link mechanism drive rod are in the upper reversal position. When the rotation angle is small (nearly linear) and a load in the rotational direction is applied to the wiper arm near the upper reversal position, the load causes the drive lever to exceed the dead point and be on the opposite side of the normal swing range. There was a possibility that the wiper arm would move backward and swing back.

  An object of the present invention is to provide a vehicle wiper device that can prevent the wiper shaft from rotating beyond the dead center of a link mechanism even when a load in the rotational direction is applied.

  A vehicle wiper device according to the present invention is a vehicle wiper device for wiping a windshield glass of a vehicle, wherein a wiper arm is attached to one end and a drive lever is fixed to the other end, and the wiper shaft is rotated. A pivot holder that is freely supported and fixed to the vehicle body at the mounting leg, a wiper motor that is connected to the drive lever via a link mechanism and that swings and drives the wiper shaft, and is provided on the mounting leg. And a stopper that contacts the drive lever when the drive lever moves beyond a predetermined range.

  In the vehicle wiper device according to the present invention, the stopper is formed so as to protrude from the mounting leg portion.

  The vehicle wiper device of the present invention includes a driver seat side pivot holder that rotatably supports the driver seat side wiper shaft, and a passenger seat side pivot holder that rotatably supports the passenger seat side wiper shaft. In addition, the stopper is provided on a mounting leg portion of at least one of the driver seat side pivot holder and the passenger seat side pivot holder.

  In the vehicle wiper device according to the present invention, the wiper shaft on the driver's seat side and the wiper shaft on the passenger seat side are disposed on both left and right sides of the vehicle body, and the stopper is provided on the mounting leg portion of the pivot holder on the driver's seat side. It is characterized by that.

  The vehicle wiper device according to the present invention includes a frame for connecting the pivot holder on the passenger seat side and the wiper motor.

  According to the present invention, when a load in the rotational direction is applied and the wiper arm attempts to move beyond a predetermined range, the drive lever fixed to the wiper shaft contacts the stopper provided on the mounting leg of the pivot holder. Therefore, the wiper shaft can be prevented from rotating beyond the dead center of the link mechanism. In particular, in the case of the opposite wiping type in which the wiper shaft on the driver's seat side and the wiper shaft on the passenger seat side are arranged on the left and right sides of the vehicle body, the speed at which the wiper arm on the driver's seat starts moving is faster than that on the passenger seat side Even if the link mechanism is set in this way, it is possible to prevent the wiper shaft on the driver's seat side from moving beyond the dead center of the link mechanism at the upper reversal position, and to prevent the wiper arm on the driver's seat side from swinging backward. it can.

  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, the DR side, and a wiper shaft 14b on the passenger seat side, that is, the AS side, disposed on the left and right sides of the vehicle body 11a. A wiper arm 15a on the driver's seat side, that is, on the DR side, is attached to the distal end, and a wiper arm 15b on the passenger side, that is, the AS side, is attached to the distal end of the wiper shaft 14b on the AS side. . 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 wiper 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 in the upper and lower proximity. 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 as shown in FIG. The DR side drive lever 48a fixed to the base end portion of the DR side 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). Furthermore, one end of an 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. The AS drive lever 48b fixed to the base end of the wiper shaft 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. As described above, the wiper motor 21 is connected to the drive levers 48a and 48b of the wiper shafts 14a and 14b via the link mechanism 55 including the output arm 45, the drive rods 47a and 47b, the intermediate rod 54, and the intermediate link 52. Thus, the wiper shafts 14a and 14b are driven to swing.

  FIG. 7 is an explanatory view showing a state of each drive lever and the link mechanism when each wiper arm is in the upper reverse position.

  Since the wiper device 13 is a counter wiping type, the link mechanism 55 is set so that the movement speed (each speed) of the DR-side wiper arm 15a from the lower reverse position is higher than that of the AS-side wiper arm 15b. This prevents the DR-side wiper blade 16a and the AS-side wiper blade 16b from interfering with each other during operation from the lower inversion position. Therefore, as shown in FIG. 7, when each of the wiper blades 16a and 16b is in the upper inverted position, an angle formed by the DR side drive lever 48a fixed to the DR side wiper shaft 14a and the DR side drive rod 47a. Is small (close to a straight line).

  On the other hand, as shown in FIG. 2, a stopper 61 is provided on the mounting leg portion 18b of the DR side pivot holder 17a, and this stopper 61 forms a small angle with respect to the DR side drive rod 47a. The side drive lever 48a is prevented from moving beyond a predetermined swing range.

  FIG. 8 is a perspective view showing details of the stopper, FIG. 9 is a cross-sectional view showing the positional relationship between the stopper and the DR side drive lever, and FIG. 10A is a DR side drive lever that swings within a predetermined range. FIG. 10B is an explanatory diagram showing a state where the DR-side drive lever that has moved beyond a predetermined range is in contact with the stopper.

  As shown in FIG. 8, the mounting leg 18b of the pivot holder 17a on the DR side is integrally formed with a base portion 62 located at a substantially intermediate portion, and the stopper 61 is integrated with the base portion 62. It is formed in a pin shape. Further, as shown in FIG. 9, the stopper 61 protrudes downward from the base portion 62 and intersects with the extension line in the swing direction of the driving lever 48a on the DR side. As a result, as shown in FIG. 10 (a), a load in the rotational direction is applied to the DR-side wiper shaft 14a swinging within a predetermined range, and as shown in FIG. 10 (b), the DR-side drive lever When 48a moves to the dead point side beyond a predetermined range, the drive lever 48a contacts the side surface of the stopper 61, and further movement of the DR side drive lever 48a is restricted. Therefore, when the DR-side wiper blade 16a is in the upper inverted position, a load in the rotational direction toward the outside of the vehicle body 11a with respect to the wiping range 12a is applied to the DR-side wiper blade 16a and the DR-side wiper arm 15a. Even if the DR-side drive lever 48a tries to move beyond the predetermined swing range to the dead center side due to the load, the DR-side drive lever 48a contacts the stopper 61, so that the DR-side drive lever 48a is dead. Moving beyond the point to the opposite side position (the position indicated by the alternate long and short dash line in FIG. 7) is prevented, and the reverse side swing (external swing) of the DR side wiper arm 15a can be prevented.

  The dead point of the DR-side drive lever 48a is a position also called a thought point, and is a position where the DR-side drive rod 47a and the DR-side drive lever 48a are aligned in a straight line.

  As described above, in the wiper device 13, the stopper 61 is provided on the mounting leg portion 18b of the DR side pivot holder 17a, and when the DR side driving lever 48a moves to the dead point side beyond a predetermined range, the driving lever Since 48a is brought into contact with the stopper 61, the movement of the DR side drive lever 48a toward the dead center can be restricted. That is, even when the wiper blades 16a and 16b are in the upper inverted position, the angle formed by the DR side drive lever 48a and the DR side drive rod 47a may be set to a small value. The load on the side wiper arm 15a can prevent the DR side wiper shaft 14a from moving beyond the dead center to the range opposite to the predetermined range, whereby the DR side wiper arm 15a The reverse swing can be prevented.

  11 is a perspective view showing a modified example of the wiper device shown in FIG. 2, and the wiper device 13 shown in FIG. 2 is a counter wiping type. However, the vehicle wiper device 71 shown in FIG. 71) is a tandem type in which the DR-side wiper arm 15a and the AS-side wiper arm 15b swing in the same direction.

  Also in this wiper device 71, a stopper 61 is provided on the mounting leg portion of the DR side pivot holder 17a. When the DR side driving lever 48a moves beyond a predetermined range, the driving lever 48a is moved to the stopper 61. A further movement of the DR side drive lever 48a is restricted, and the reverse side of the DR side wiper shaft 14a, that is, the DR side wiper arm 15a, is prevented.

  In FIG. 11, members corresponding to the members described above are given the same reference numerals.

  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 stopper 61 prevents the DR-side drive lever 48a from moving beyond the upper reversal position to the dead point side. Is provided on the mounting leg portion 18c of the DR side pivot holder 17a to prevent the DR side drive lever 48a from moving beyond the lower inversion position to the dead center side. What is necessary is just to be provided so that the movement beyond a predetermined range can be controlled.

  In this embodiment, the stopper is provided only on the mounting leg 18b of the DR side pivot holder 17a. However, the present invention is not limited to this, and the mounting legs 19a and 19b of the AS side pivot holder 17b are provided. Only the stoppers may be provided, or the stoppers may be provided on the mounting legs of both pivot holders 17a and 17b.

  Furthermore, 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. .

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 explanatory drawing which shows the state of each drive lever and a link mechanism when each wiper arm will be in an upper inversion position. It is a perspective view which shows the detail of a stopper. It is sectional drawing which shows the positional relationship of a stopper and the drive lever by the side of DR. (A) is explanatory drawing which shows the DR side drive lever which rocks a predetermined range, (b) is explanatory drawing which shows the state which the DR side drive lever which moved beyond the predetermined range contact | abutted to the stopper is there. It is a perspective view which shows the modification of the wiper apparatus shown in FIG.

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 Links 52a, 52b Connecting Portion 53 Supporting Shaft 54 Intermediate Rod 55 Link Mechanism 61 Stopper 62 Base 71 Vehicle wiper device

Claims (5)

A vehicle wiper device for wiping a windshield glass of a vehicle,
A wiper shaft having a wiper arm attached to one end and a drive lever fixed to the other end;
A pivot holder that rotatably supports the wiper shaft and is fixed to the vehicle body at a mounting leg;
A wiper motor connected to the drive lever via a link mechanism and driving the wiper shaft to swing;
A vehicle wiper device, comprising: a stopper provided on the mounting leg portion and abutting against the drive lever when the drive lever moves beyond a predetermined range.   2. The vehicle wiper device according to claim 1, wherein the stopper is formed so as to protrude from the mounting leg portion.   3. The vehicle wiper device according to claim 1, wherein a driver seat side pivot holder for rotatably supporting a driver seat side wiper shaft and a passenger seat side pivot for rotatably supporting a passenger seat side wiper shaft. A vehicle wiper device, wherein the stopper is provided on an attachment leg of at least one of the pivot holder on the driver's seat side or the pivot holder on the passenger seat side.   4. The vehicle wiper device according to claim 3, wherein the driver seat side wiper shaft and the passenger seat side wiper shaft are arranged on both left and right sides of a vehicle body, and the stopper is attached to a mounting leg portion of the driver seat side pivot holder. A vehicle wiper device characterized by comprising:   5. The vehicle wiper device according to claim 4, further comprising a frame connecting the pivot holder on the passenger seat side and the wiper motor.

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