JP2004066992A - Wiper device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device for a vehicle capable of disposing a wiper motor between shafts without causing a wiping action offending the eye and making an occupied space small even if a distance between the shafts fixed with the wiper arm is short. <P>SOLUTION: The wiper motor 3 having an output shaft 3a fixed with the first wiper arm and carrying out a turning motion is fixed to one end of a frame 2 and a pivot holder 4 for turnably supporting the pivot shaft 10 fixed with the second wiper arm is fixed to the other end. A first turning lever 9 carrying out a pivoting motion by the turning motion of the output shaft 3a is fixed to the output shaft 3a and a second turning lever 12 is fixed to the pivot shaft 10. The first turning lever 9 and the second turning lever 12 are connected through a link rod 14 such that the second turning lever 12 carries out the pivoting motion in synchronous to the pivoting motion of the first turning lever 9. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle wiper device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a so-called modular wiper device in which a wiper motor, a link mechanism, a pair of pivot holders, and the like are integrally mounted on a frame as a support base.
[0003]
FIG. 4 shows a side view of a conventional wiper device 31.
The wiper device 31 includes a frame 32, and a wiper motor 33 is fixed substantially at the center of the frame 32. A crank arm 34 is rotatable with the output shaft 33a on an output shaft 33a of the wiper motor 33. Fixed. The crank arm 34 is connected to one ends of a first link rod 38 and a second link rod 39 via ball joints 35 and 36. The other end of the first link rod 38 is connected to one end of a first turning lever 40 via a ball joint 41, and a first pivot shaft 42 is connected to the other end of the first turning lever 40. The first wiper arm is fixed to the tip of the first pivot shaft 42.
[0004]
The first pivot shaft 42 is rotatably supported by a first pivot holder 43. The first pivot holder 43 is fixed to one end of the frame 32, and the other end of the frame 32 is fixed to a second pivot holder 44. The second pivot holder 44 rotatably supports a second pivot shaft 45. The second pivot shaft 45 is fixed to one end of a second rotating lever 46. The other end of the second rotating lever 46 is connected to the other end of the second link rod 39 via a ball joint 47.
[0005]
When the wiper motor 33 operates and the crank arm 34 continuously rotates in one direction, the driving force is transmitted through the first and second link rods 38 and 39 and the first and second rotating levers 40 and 46. Thus, the first and second pivot shafts 42 and 45 perform reciprocating rotation movements. Then, the first and second wiper arms fixed to the first and second pivot shafts 42 and 45 respectively perform oscillating motions.
[0006]
[Problems to be solved by the invention]
By the way, depending on the vehicle to which the wiper device is mounted, the interval between the shafts to which the wiper arm is fixed (the pivot shafts 42 and 45 in the wiper device 31 described above) may need to be reduced. However, in the above-described wiper device 31, the wiper motor 33 is fixed to the frame 32 connecting the pivot shafts 42 and 45, and the first and second links are connected to both the first and second pivot shafts 42 and 45. They are connected via rods 38, 39. Therefore, the length of one or both of the first and second link rods 38 and 39 becomes extremely short.
[0007]
As described above, when the link rods 38 and 39, which are intermediate nodes constituting a link mechanism for transmitting the rotational movement of the output shaft 33a to the pivot shafts 42 and 45 to rotate the pivot shafts 42 and 45, are shortened, the wiping speed of the wiper arm is reduced. Affect. For this reason, the driver may feel uncomfortable and perform an unsightly wiping operation. In addition, there is a concern that the wiping operation may exceed the normal wiping region due to inertial force and interfere with the vehicle body. That is, since the crank arm 34 is performing a constant velocity circular motion, when converted into a reciprocating swing motion by the short link rods 38, 39, the rotation of the pivot shafts 42, 45, that is, the wiping speed of the wiper arm becomes the reverse position. There is a problem that the vehicle suddenly accelerates at the start of movement from the vehicle and decelerates rapidly toward the reverse position.
[0008]
Therefore, in order to secure the length of the link rod for connecting the output shaft of the wiper motor and the pivot shaft, the wiper motor is removed from the frame that connects the pivot shafts linearly, and the first and second wiper arms are provided. The first and second wiper arms are connected by a link mechanism that operates in synchronization with each other between the pivot shafts to which are fixed. Then, the rotating lever fixed to one pivot shaft and the crank arm fixed to the output shaft of the wiper motor are connected by a link rod, and the wiper motor is arranged at a position where the length of the link rod can be sufficiently secured. By doing so, the distance between the axes to which the wiper arm is fixed is reduced, and the wiper arm can be moved at an ideal wiping speed.
[0009]
However, in order to secure the length of the link rod for connecting the pivot shaft and the output shaft, a space for installing the wiper motor and a space for operating the link mechanism that transmits the driving force of the output shaft to the pivot shaft are newly secured. And the space occupied by the wiper device becomes large as a whole.
[0010]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a wiper motor between shafts without causing an unsightly wiping operation even when a distance between shafts to which a wiper arm is fixed is short. An object of the present invention is to provide a wiper device for a vehicle that can be arranged and occupied space can be reduced.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 has an output shaft to which a first wiper arm is fixed, and a wiper motor that reciprocates the output shaft within a predetermined angle range; A first rotation lever fixed to be integrally rotatable, a pivot shaft to which a second wiper arm is fixed, a second rotation lever fixed to be able to rotate integrally with the pivot shaft, and one end. The other end is rotatably connected to the first turning lever and the other end is turnably connected to the second turning lever, and is synchronized with the reciprocating turning of the first turning lever. And a link rod for reciprocating the second rotation lever.
[0012]
The invention according to claim 2 includes a pivot holder that rotatably supports the pivot shaft, and a frame to which the pivot holder and the wiper motor are fixed.
[0013]
According to a third aspect of the present invention, there is provided a pivot shaft to which a third wiper arm is fixed, a third pivot lever fixed to the pivot shaft, and one end of which is the first pivot lever or the second pivot lever. A link rod fixed to the moving lever and the other end fixed to the third rotating lever, and reciprocatingly rotating the third rotating lever in synchronization with the reciprocating rotation of the first rotating lever; , With.
[0014]
(Action)
According to the first aspect of the present invention, the first wiper arm is directly fixed to the output shaft performing the reciprocating rotation, and the output shaft and the pivot shaft are connected by the first and second rotation levers and the link rod. By the connection, the first wiper arm and the second wiper arm reciprocately pivot in synchronization with the reciprocal pivotal movement of the output shaft. Therefore, the distance between the shafts to which the wiper arms are fixed is short, and the space occupied by the entire wiper device is reduced.
[0015]
According to the second aspect of the present invention, by fixing the wiper motor, the pivot holder, and the link mechanism to the frame, the wiper device is modularized, and mounting is facilitated.
[0016]
According to the third aspect of the present invention, the output shaft of the wiper motor is connected to the two pivot shafts via the two link rods, and the three wiper arms reciprocate in synchronization with the reciprocation of the output shaft. I do.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a top view illustrating the overall configuration of the wiper device 1 of the present embodiment, and FIG. 2 is a side view illustrating the overall configuration of the wiper device 1.
[0018]
The wiper device 1 of the present embodiment is a so-called modular wiper device in which a wiper motor 3, a link mechanism, and a pivot holder 4 are integrally mounted on a frame 2.
[0019]
A wiper motor 3 is fixed to one end of the frame 2, and a pivot holder 4 is fixed to the other end of the frame 2. In the present embodiment, the wiper device 1 is mounted on the vehicle body with the wiper motor 3 disposed on the driver's seat side and the pivot holder 4 disposed on the passenger's seat side.
[0020]
The wiper motor 3 has a configuration in which a motor unit 5 and a gear unit 6 are provided integrally. A motor housing 5a of the motor section 5 is fixed to a gear case 6a covering the gear section 6, and a mounting hole 6b is formed in the gear case 6a. The wiper motor 3 is fixed to the frame 2 by bolts and nuts 7 through the mounting holes 6b.
[0021]
The wiper motor 3 reciprocates the output shaft 3a within a preset angle θ. Note that the wiper motor 3 of the present embodiment is a wiper motor 3 that transmits the driving force of the motor unit 5 to the output shaft 3a by a worm gear provided in the gear unit 6, and by rotating the motor unit 5 forward and reverse. The output shaft 3a is reciprocally rotated within a predetermined angle θ.
[0022]
A first wiper arm 8 is fixed to a tip of an output shaft 3a of the wiper motor 3, and one end of a first rotating lever 9 of a rod is fixed to the output shaft 3a. Therefore, the first wiper arm 8 and the first rotation lever 9 fixed to the output shaft 3a are similarly reciprocated by the reciprocating rotation of the output shaft 3a.
[0023]
The pivot holder 4 is provided with a cylindrical portion 4a, and the cylindrical portion 4a is formed in a substantially cylindrical shape. A pivot shaft 10 is inserted through the cylindrical portion 4a, and the pivot shaft 10 is rotatably supported. A second wiper arm 11 (partially omitted) is fixed to a tip of the pivot shaft 10. Further, one end of a rod-shaped second rotation lever 12 is fixed to the pivot shaft 10.
[0024]
The other end of the second turning lever 12 is connected to one end of a rod-shaped link rod 14 via a ball joint 13a, and the other end of the link rod 14 is connected to the other end of the first turning lever 9. It is connected to an end (an end not fixed to the output shaft 3a) via a ball joint 13b.
[0025]
When the output shaft 3a reciprocates by the operation of the wiper motor 3, a driving force is transmitted through the first rotating lever 9, the link rod 14, and the second rotating lever 12, and the pivot shaft 10 reciprocates. I do. Then, the second wiper arm 11 fixed to the pivot shaft 10 reciprocates accordingly.
[0026]
In the present embodiment, the lengths of the first rotating lever 9, the link rod 14, and the second rotating lever 12 are adjusted so that the output shaft 3a and the pivot shaft 10 operate synchronously. Therefore, when the output shaft 3a reciprocates, the pivot shaft 10 also reciprocates in synchronization. That is, the second wiper arm 11 reciprocates in synchronization with the reciprocating pivotal movement of the first wiper arm 8.
[0027]
The frame 2, the wiper motor 3, and the pivot holder 4 are respectively provided with mounting holes 2a, 3b, 4b for mounting on a vehicle body. The wiper device is bolted through these mounting holes 2a, 3b, 4b. 1 is attached to the vehicle body.
[0028]
As described in detail above, this embodiment has the following features.
(1) The first wiper arm 8 is fixed to the output shaft 3a that performs reciprocating rotation, and the output shaft 3a and the pivot shaft 10 are connected by the first and second rotation levers 9, 12 and the link rod 14. Then, the operation of the pivot shaft 10 is connected so as to be synchronized with the operation of the output shaft 3a. That is, the reciprocating rotational movement of the output shaft 3a of the wiper motor 3 directly causes the wiping operation of the first wiper arm 8, and the second wiper arm 11 synchronizes with the wiping operation of the first wiper arm 8 in the same direction. I do.
[0029]
In addition, since the output shaft 3a of the reciprocating wiper motor 3 is used as the pivot shaft 10 to which the first wiper arm 8 is fixed, the first wiper arm 8 is directly fixed to the output shaft 3a. This eliminates the need for a pivot shaft to which the first wiper arm 8 is fixed, a pivot holder for rotatably supporting the pivot shaft, and a link rod for transmitting reciprocating rotational motion to the pivot shaft. it can. That is, the first and second wiper arms 8 and 11 can be wiped without providing the pivot shaft, the pivot holder and the link rod on the first wiper arm 8 side. For this reason, the number of parts can be eliminated, and the entire wiper device 1 can be reduced in size and weight, and it is not necessary to secure an extra operation space necessary for these members to operate. Therefore, the space occupied by the wiper device 1 can be reduced.
[0030]
(2) By fixing the wiper motor 3 and the pivot holder 4 to the frame 2, the wiper device 1 is modularized, which facilitates the attachment to the vehicle.
In addition, it can be embodied in the following forms other than the above.
[0031]
In the above-described embodiment, the wiper device 1 is modularized by providing the frame 2 with the wiper motor 3, the pivot holder 4, and the link mechanism. That is, a so-called component system is adopted in which the wiper motor 3 and the pivot holder 4 are directly attached to the vehicle body, and the output shaft 3a and the pivot shaft 10 are connected by the first and second rotating levers 9, 12 and the link rod 14. May be.
[0032]
In the above embodiment, the first wiper arm 8 and the first rotary lever 9 are fixed to the output shaft 3a of the wiper motor 3, and the two wiper arms 8, 11 are operated. May be operated.
[0033]
This will be described with reference to FIG. FIG. 3 is a schematic view showing the wiping operation of three wiper arms. In the following description, the pivot shaft 10 and the pivot holder 4 described in the above embodiment will be referred to as a first pivot shaft 10 and a first pivot holder 4, respectively, for convenience. Further, the link rod 14 described in the above embodiment is also referred to as a first link rod 14 in the following description. The same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0034]
A second pivot holder 23 rotatably supports a second pivot shaft 22 to which the third wiper arm 21 is fixed. The second pivot shaft 22 includes the output shaft 3 a and the first pivot shaft 10. And placed along the line connecting. One end of a third pivot lever 24 is fixed to the second pivot shaft 22, and one end of a second link rod 25 is connected to the other end of the third pivot lever 24 via a ball joint. Then, the other end of the second link rod 25 is connected to the second rotating lever 12 via a ball joint.
[0035]
In this way, by using the two first and second link rods 14 and 25, the second and third wiper arms 11, in synchronization with the wiping operation of the first wiper arm 8, and in the same direction. 21 performs the wiping operation. Since the three wiper arms 8, 11, and 21 perform the wiping operation in synchronization with each other, the present invention can also be applied to a large wiping surface 26 such as a windshield of a truck. In addition, this wiper device of another example may employ either the module system or the component system.
[0036]
In the above embodiment, the output shaft 3a is reciprocated by rotating the wiper motor 3 forward and reverse by reversing the polarity of the power supply of the wiper motor 3. As another example, for example, a pinion gear meshes with a rack that swings by one-way continuous rotation of a motor, and a rotation mechanism that reciprocates the output shaft 3a by fixing the pinion gear to one end of the output shaft 3a is incorporated. A wiper motor may be employed.
[0037]
A technical idea that can be obtained from the above-described embodiment and another example will be disclosed.
3. The vehicle wiper device according to claim 2, wherein the vehicle wiper device is fixed to the vehicle body via the frame.
[0038]
(B) The wiper device for a vehicle according to claim 3, wherein the second pivot holder is fixed to the frame.
[0039]
【The invention's effect】
As described in detail above, according to the present invention, it is possible to provide a wiper device for a vehicle in which a wiper motor can be arranged between the shafts and the occupied space can be reduced even if the distance between the shafts to which the wiper arms are fixed is short. Can be.
[Brief description of the drawings]
FIG. 1 is a schematic top view of a wiper device.
FIG. 2 is a schematic side view of the wiper device.
FIG. 3 is a schematic diagram of another example of a wiper device.
FIG. 4 is a schematic side view of a conventional wiper device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wiper apparatus, 2 ... Frame, 3 ... Wiper motor, 3a ... Output shaft, 4 ... Pivot holder, 8 ... First wiper arm, 9 ... First rotating lever, 10 ... Pivot shaft, 11 ... Second wiper arm , 12 ... second pivot lever, 14 ... link rod, 21 ... third wiper arm, 22 ... second pivot shaft, 24 ... third pivot lever, 25 ... second link rod.

Claims (3)

A wiper motor having an output shaft to which the first wiper arm is fixed, the wiper motor reciprocatingly rotating the output shaft within a predetermined angle range,
A first rotation lever fixed to the output shaft so as to be integrally rotatable;
A pivot shaft to which the second wiper arm is fixed;
A second rotation lever fixed to the pivot shaft so as to be integrally rotatable;
One end is rotatably connected to the first rotating lever and the other end is rotatably connected to the second rotating lever, and is synchronized with the reciprocating rotation of the first rotating lever. A link rod for reciprocatingly rotating the second rotating lever;
A wiper device for a vehicle, comprising: A pivot holder rotatably supporting the pivot shaft,
A frame to which the pivot holder and the wiper motor are fixed,
The vehicle wiper device according to claim 1, further comprising: A pivot shaft to which the third wiper arm is fixed;
A third pivot lever fixed to the pivot shaft,
One end is fixed to the first turning lever or the second turning lever, and the other end is fixed to the third turning lever, and the one end is synchronized with the reciprocating turning of the first turning lever. A link rod for reciprocatingly rotating the third rotating lever;
The vehicle wiper device according to claim 1 or 2, further comprising:

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