JP3072205B2 - Wiper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device and, more particularly, to an improvement in a wiping operation of a wiper, and more particularly to a wiper device which is effective when used in a vehicle such as an automobile.

[0002]

2. Description of the Related Art Generally, in a wiper device mounted on a vehicle such as an automobile, the rotational motion of a wiper driving motor is converted into a reciprocating swing motion of a wiper arm by a link motion mechanism, and the wiper arm is attached to a tip of the wiper arm. The blade is being wiped.

In such a wiper device, the load applied to the wiper drive motor is high when the blade is wiping the vicinity of the center of the glass surface, and is low when the blade is moving between both reversing positions. For this reason, the speed of the driving motor is slow at the center of the glass surface and is fast at both reversal positions.
When the drive motor is driven in such a state, inertia increases due to the own weight of the wiper blade and an increase in angular acceleration during reversal by the link motion mechanism,
At the time of reversal, there is a problem that the wiper blade goes into a so-called overwiping state exceeding a designated wiping range, the reversal sound increases at the time of reversal, and the components of the link motion mechanism become fatigued.

Therefore, as described in Japanese Patent Application Laid-Open No. 59-92235, when the wiper blade reaches a position immediately before reversal, the current of the drive motor is reduced to move the wiper blade at a low speed. A wiper device that performs a wiping operation has been proposed. That is,
In this wiper device, since the speed of the drive motor can be prevented from increasing when the wiper blade reaches the reversal position, the wiper device may be over-wiped or the reversal sound may increase when reversing. Can be prevented.

[0005]

However, in the wiper device described in the above publication, the speed of the driving motor is controlled by the current of the driving motor.
Simply controlling the current of the drive motor cannot sufficiently and reliably suppress the inertial force of the wiper blade, so that an overwiping state occurs at the time of reversal or the reversal noise increases.

It is an object of the present invention to provide a wiper device capable of sufficiently and reliably suppressing an inertial force when a wiper blade reaches an end of a wiping range.

[0007]

According to the present invention, there is provided a wiper apparatus comprising: a wiper driving motor; a driving gear driven by the wiper driving motor; and a wiping link for wiping a wiper blade by receiving a rotational force of the driving gear. A wiper device having a mechanism, wherein a speed control motor is connected to a rotation shaft of the wiper drive motor,
A switch for controlling the speed control motor is incorporated between the drive gear and its gear housing,
The switch includes a pair of contacts connected to open and close a drive circuit of the speed control motor, and a pair of brake conductive members that relatively rotate while slidingly contacting the two contacts with the rotation of the drive gear. Plate and the conductive plate for both brakes are in contact with each other in the process of moving the wiper blade from the middle of the wiping area to the end of the wiping area with respect to the rotation of the drive gear. , Respectively.

Further, in the wiper device according to the present invention, the switch is connected to a pair of contacts connected to open and close a drive circuit of the speed control motor, and to the two contacts as the drive gear rotates. A pair of accelerator conductive plates that rotate relatively while sliding each other are provided, and the wiper blades move from the end of the wiping area to the intermediate portion with respect to the rotation of the drive gear. Are arranged so as to come into contact with each other in the process of performing.

[0009]

According to the first means, in the process of moving the wiper blade from the middle part of the wiping area to the single wiping area, the brake conductive plate and the contact come into contact with each other, so that the speed controlling motor is provided. Is short-circuited, the motor for speed control acts as an electromagnetic brake device. Since the braking force of the speed controlling motor acts on the wiper driving motor, the inertial force when the wiper blade reaches the end of the wiping area is sufficiently suppressed.

According to the second means, when the wiper blade is being wiped by the drive motor, the wiper blade moves from the end to the intermediate portion of the wiping area, and the accelerator conductive member is moved. When the plate and the accelerator contact come into contact with each other, power is supplied to the speed control motor, so that the speed control motor is driven to rotate. Accordingly, the driving force of the drive motor is assisted by the driving force of the speed control motor, so that the wiping force of the wiper blade is increased.

[0011]

FIG. 1 is a circuit diagram showing a wiper device according to one embodiment of the present invention. FIG. 2 is a front sectional view showing a main part of the wiper device, FIG. 3A is a plan sectional view thereof, and FIG. 3B is a rear view showing a drive gear thereof. FIG. 4 is a schematic diagram for explaining the operation of the wiper device. FIG. 5 is a characteristic diagram showing the relationship between the rotation angle of the wiper blade and the load on the wiper driving motor.

In this embodiment, the wiper device includes a gear housing 1, and the gear housing 1 is provided with a main body 2.
A closed chamber is formed by covering the opening 3 with the lid 3. A drive shaft 4 is rotatably supported at a substantially central portion of the main body 2. One end of a rod 7 is rotatably connected to a free end of a link 5 integrally rotating with the shaft 4 via a pole joint 6. And rod 7
Is rotatably connected to the free end of the linkage 8.

One end of the linkage 8 is fixed to a shaft 9 rotatably supported at a lower position in a window frame of a vehicle, and the free end of the shaft 9 has a wiper blade 11.
Is supported so as to rotate integrally.

On the other hand, a drive gear 12 integrally formed of a hard synthetic resin is fitted to the end of the drive shaft 4 in the chamber of the gear housing 1 so as to rotate integrally. A worm 13 is meshed with the drive gear 12. That is, the rotating shaft of the driving motor described later penetrates through the main body 2 of the gear housing 1 and is inserted into the gear housing 1 so as to be perpendicular to the axis of the drive shaft 4. A worm 13 is integrally formed on the outer periphery.

A motor housing 14 is connected to one side of the gear housing 1, and a drive motor and a speed control motor are integrally incorporated in the motor housing 14. The drive motor 15 is the rotating shaft 1
6 and an armature 17 that rotates integrally with the rotating shaft 16.
And a commutator 18, a brush device 19 for supplying power to the armature 17 via the commutator 18, and a magnet 20 as a field pole.

The speed control motor 21 also includes a rotating shaft, an armature 22 and a commutator 23 which rotate integrally with the rotating shaft, a brush device 24 for supplying power to the armature 22 via the commutator 23, and a magnet as a field pole. It has. However, speed control motor 2
One rotating shaft is shared with the rotating shaft 16 of the driving motor 15, and the field pole is also shared with the magnet 20. The armature 22 is connected to the driving motor 15
Is wound on the same rotation shaft 16 as the armature 17. Therefore, the driving force of the speed control motor 21 is configured to control the torque of the rotating shaft 16 of the driving motor 15.

The lid 3 is made of an insulating material such as a hard synthetic resin, and is integrally formed in a dish shape having a plane shape substantially equal to that of the main body 2. A first contact 31 and a second contact 32 are provided on the lower surface of the lid 3 with the drive shaft 4.
It is arranged around inside and outside, and is fixedly attached at one end. The first contact 31 and the second contact 32 are in a state of being electrically connected to a conductive plate described later.

The first contact 31 and the second contact 32 are made of a plate material having conductivity and appropriate elasticity, such as brass, and are stamped and formed into a rectangular shape in plan view. The contacts 31 and 32 are bent so as to slightly warp in the thickness direction, and the warp cooperates with the elasticity of the contact itself to form a contact protruding from the free end of the contact as described later. It is configured to press against the conductive plate with an appropriate urging force.

On the upper surface of the drive gear 12, a first conductive plate 33 is provided.
The second conductive plate 34 and the second conductive plate 34 are arranged concentrically with respect to the center line of the drive shaft 4, and are fixed by appropriate means such as implantation.

The first conductive plate 33 disposed inside is formed in a C-shape, and the first contact 31 is formed on the first conductive plate 33 by the elastic force of the first contact 31 itself as described above. It is designed to be always in contact.

The second conductive plate 34 disposed on the outside is formed in a substantially sector shape, and is disposed in a cutout portion of the first conductive plate 34. The notch substantially forms the non-conductive portion 35. At the center of the non-conductive portion 35, the stop position piece 3 formed in a substantially fan shape by the outer portion of the second conductive plate 34
6 are arranged concentrically. The circular orbit drawn by the second conductive plate 34, the non-conductive portion 35 and the stop position piece 36
The contact 32 is constantly pressed by its elastic force.

The first conductive plate 33, the second conductive plate 34, and the stop position piece 36 are shown in FIG. 1 in an electric circuit including the power supply 25, the wiper switch 26, the driving motor 15, and the like. The connection as described above constitutes an auto stop switch 30 for opening and closing the electric circuit of the driving motor 15.

The speed control motor 21 is configured to be controlled by a switch (hereinafter, referred to as a speed control switch) 40 different from the auto stop switch 30. That is, the speed control switch 40 is incorporated between the main body 2 and the drive gear 12, and includes three contacts 41, 42, 43, and a pair of accelerator conductive plates 44, 45 on the outward and return paths. , A pair of brake conductive plates 46 and 47 on the outward and return sides.

The two accelerator conductive plates 44 and 45 are formed in a substantially sector shape, and are disposed on the lower surface of the drive gear 12 in a circumferential direction.
It is fixed at intervals of 80 degrees. The conductive plates 46 and 47 for both brakes are also formed in a substantially sector shape, and the drive gear 12
Are fixed to the lower surface of the base plate at an interval of 180 degrees from each other in the circumferential direction and at intervals of 90 degrees to both the accelerator conductive plates 44 and 45.

The first, second and third contacts 41, 42, 4 are located within the movement area of each of the conductive plates 44 to 47.
3, and one end is fixedly attached to the upper surface of the main body 2. The first contact 41 is connected to the positive terminal of the power supply 25, and the second contact 42 and the third contact
The contacts 43 are connected to the brush devices 23 of the speed control motor 21, respectively. Further, the third contact 43 is grounded.

The first contact 41 and the second contact 42 supply electric power from the power supply 25 to the speed control motor 21 when they come into contact with the forward-side accelerator conductive plate 44 and the backward-side accelerator conductive plate 45, respectively. The switch is configured as an accelerator switch for closing the electric circuit of the speed control motor 21.

The second contact 42 and the third contact 43 are disposed so as to be in contact with the forward brake conductive plate 46 and the backward brake conductive plate 47, respectively. When both ends of the speed control motor 21 are short-circuited when they come into contact with the conductive plates 46 and 47, respectively, the speed control motor 21 is configured as a brake switch for causing the speed control motor 21 to function as an electromagnetic brake device.

Conductive plate 4 for accelerator on the outward and return paths
Reference numerals 4 and 45 are such that the wiper blade 11 is brought into contact with the first contact 41 and the second contact 42 in the process of moving from the end of the wiping area, that is, the automatic stop position or the reverse position to the intermediate part of the wiping area. Is positioned at

Conductive plate 4 for forward and backward brakes
6, 47 are the second steps in the process in which the wiper blade 11 moves from the middle part of the wiping area to the end of the wiping area, respectively.
It is positioned so as to be in contact with the contact 42 and the third contact 43.

Next, the operation will be described. (1) Wiping operation When the wiper switch 26 is turned on, the drive motor 15 is rotated to supply power to the power supply 25, the ON contact of the wiper switch 26, and the ground. The rotation of the drive motor 15 is transmitted to the drive gear 12 from a worm 13 formed integrally with the rotation shaft 16.

When the drive gear 12 is rotated, the rotation is converted into a reciprocating rotation of the wiper arm 10 by the link 5, the rod 7, the linkage 8, and the shaft 9 of the drive shaft 4, and the reciprocating rotation causes the wiper arm 10 to rotate. The wiper blade 11 performs the wiping operation.

During the wiping operation, the first conductive plate 33 and the second conductive plate 34 of the auto stop switch 30 attached so as to rotate integrally with the drive gear 12 are:
It revolves while sliding on the first contact 31 and the second contact 32, respectively. However, since the drive motor 15 is energized by bypassing the auto stop switch 30, these contacts 31, 32
And the conductive plates 33 and 34 slide relative to each other.
5 does not affect the operation.

(2) Normal fixed position stop operation When the wiper switch 26 is turned off, the ON contact of the wiper switch 26 is opened and the OFF contact is closed.

When the wiper blade 11 is positioned in the middle of the window when the wiper switch 26 is turned OFF at random, the second contact 32 is not in contact with the second conductive plate 34. As a result, the power supply 25, the drive motor 15, and the wiper switch 26
Since the F contact, the first contact 31, the first conductive plate 33, and the ground are energized, the drive motor 15 keeps rotating.

As the rotation of the drive motor 15 continues,
When the first contact 31 reaches the non-conductive portion 35 of the first conductive plate 33, the conduction between the first contact 31 and the first conductive plate 34 is cut off, so that the drive motor 15 is not energized.

When the first contact 31 and the second contact 32 relatively move to the stop position piece 36 and come into contact therewith due to inertia in the rotation system of the drive motor 15 and the drive gear 12, etc., the drive motor 15,
OFF contact of wiper switch 26, first contact 3
1. Since the closed circuit of the stop position piece 36, the second contact 32, and the drive motor 15 is formed, the drive motor 15 functions as an electromagnetic brake device, so that the drive motor 15 is suddenly stopped. become.

When the driving motor 15 is suddenly stopped in this way, the correlation between the components is set such that the wiper blade 11 is at a fixed position in the lower corner of the window. Even if the wiper blade 11 is turned off at random, the wiper blade 11 is always stopped at a fixed position.

(3) Speed Control Operation During Wiping The wiper blade 11 is driven by the drive motor 15.
During the wiping operation, as shown in FIG. 5, in the process of moving the wiper blade 11 from the automatic stop position to the middle part of the wiping area, the forward contact accelerator conductive plate 44 contacts the first contact. 41 and second contact 42
It comes into contact with. By this contact, the armature 22 of the speed control motor 21 is energized, so that the speed control motor 21 is driven. Therefore, since the driving force of the driving motor 15 is assisted by the driving force of the speed control motor 41, the wiper blade 11 is accelerated.

Then, as shown in FIG. 5, after the wiper blade 11 has passed the intermediate portion of the wiping area and before the wiper blade 11 reaches the reversing position, the forward brake conductive plate 46 is moved to the second position. It comes into contact with the contact 42 and the third contact 43. Due to this contact, the armature 22 of the speed control motor 21 is short-circuited. This short circuit causes the speed control motor 21 to function as an electromagnetic brake device. Since the braking force of the speed control motor 21 acts on the drive motor 15 sharing the rotating shaft 16, the drive motor 15 is forcibly decelerated. Since the wiper blade 11 is decelerated by the deceleration of the drive motor 15, the wiper blade 11 gradually reaches the reverse position.

Subsequently, as shown in FIG. 5, on the return path side where the wiper blade 11 is moving from the reverse position to the middle part of the wiping area, the return path-side accelerator conductive plate 45 is moved to the second position. The first contact 41 and the second contact 42 come into contact with each other. The speed control motor 21 is driven by this contact. Since the drive motor 15 is assisted by the drive force of the speed control motor 21, the wiper blade 11 is accelerated.

As shown in FIG. 5, after the wiper blade has passed the intermediate portion of the wiping area and before the automatic stop position has been reached, the return-side brake conductive plate 47 is connected to the second contact 42 and the third contact 42. It comes into contact with the contact 43. Due to this contact, the armature 22 of the speed control motor 21 is short-circuited. This short-circuit causes the speed control motor 21 to function as an electromagnetic brake device, so that the braking force forcibly decelerates the drive motor 15 and the wiper blade 11 returns to the automatic stop position at a slow speed. You will be in a state to do.

Thereafter, during the wiping operation, the above operation is repeated, so that the speed of the wiping operation of the wiper blade 11 is constantly controlled.

In the present embodiment described above, before the wiper blade 11 reaches the reversing position or the automatic stop position, the braking force of the speed control motor 21 is urged by the driving motor 15 to drive the driving motor 15. Since the deceleration control is forcibly performed, the inertial force when the wiper blade 11 reaches the reverse position or the automatic stop position can be sufficiently suppressed. For this reason, it is possible to suppress the wiper blade 11 from being over-wiped and the reverse sound from increasing.

Further, in the present embodiment, in the process of moving the wiper blade 11 from the reversing position or the automatic stop position to the middle part of the wiping area, the speed control motor 2 is used.
Since the drive motor 15 is accelerated by the drive 1, the driving force when the motor load is increased can be reinforced to prevent the motor speed from decreasing, and the wiper operation speed can be smoothed. .

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

For example, the acceleration control when the wiper blade 11 moves from the reverse position or the ground stop position to the middle part of the wiping area may be omitted.

In the above embodiment, the conductive plates are provided on both end surfaces of the drive gear. However, the conductive plates may be all provided on one end surface of the drive gear.

[0048]

As described above, according to the present invention,
In addition to the wiper drive motor, a speed control motor that rotates integrally with this motor is provided, and in the process of moving the wiper blade from the middle part of the wiping area to the end, the braking force of the speed control motor is used for the wiper drive motor. And the wiper drive motor is configured to be forcibly decelerated and driven, so that the inertial force when the wiper blade reaches the end of the wiping area can be sufficiently suppressed, and the wiper blade may be in an overwipe state during reversal, It is possible to prevent the reverse sound from increasing.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a wiper device according to one embodiment of the present invention.

FIG. 2 is a front sectional view showing a main part of the wiper device.

FIG. 3A is a plan cross-sectional view, and FIG. 3B is a rear view showing the drive gear.

FIG. 4 is a schematic diagram for explaining the operation of the wiper device.

FIG. 5 is a characteristic diagram showing a relationship between a rotation angle of a wiper blade and a motor load.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Body, 3 ... Lid, 4 ... Drive shaft, 5 ... Link, 6 ... Ball joint, 7 ... Rod, 8 ... Linkage, 9 ... Shaft, 10 ... Wiper arm, 11 ... Wiper blade, 12 ... Drive gear, 13 worm, 14 motor housing, 15 wiper drive motor, 16 rotating shaft, 17 armature, 18
... commitator, 19 ... brush device, 20 ... magnet,
21: speed control motor, 22: armature, 23
... Commutator, 24 ... Brush device, 25 ... Power supply, 26 ...
Wiper switch, 30 ... Auto stop switch, 31
... first contact, 32 ... second contact, 33 ... first
Conductive plate, 34: second conductive plate, 35: non-conductive portion, 36: stop position piece, 40: speed control switch, 41: first contact, 42: second contact, 43: third contact, 44 ... Conductor plate for forward accelerator, 45 ... Conductor plate for backward accelerator, 46 ... Conductor plate for forward brake, 47 ...
Conductive plate for return side brake.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60S 1/08 H02P 7/06

Claims (2)

(57) [Claims] 1. A wiper device comprising: a wiper driving motor; a driving gear driven by the wiper driving motor; and a wiping link mechanism for wiping a wiper blade by receiving a rotational force of the driving gear. A speed control motor is connected to a rotation shaft of the drive motor, and a switch for controlling the speed control motor is incorporated between the drive gear and its gear housing. A pair of contacts that are connected to open and close the drive circuit of the motor for driving, and a pair of conductive plates for brake that relatively rotate while sliding on the two contacts with the rotation of the drive gear. The wiper blades move from the middle of the wiping area with respect to the rotation of the drive gear. A wiper device which is arranged so as to be in contact with each other in a process of moving to an end of a wiping area. 2. The switch according to claim 1, further comprising: a pair of contacts connected to open and close a drive circuit of the speed control motor; The contact and both accelerator conductive plates are in contact with each other in the process of moving the wiper blade from the end of the wiping area to the intermediate portion with respect to the rotation of the drive gear. The wiper device according to claim 1, wherein the wiper devices are arranged so as to be arranged as follows.