JP2994816B2 - Vehicle 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 for a vehicle, and more particularly, to a wiper device for a vehicle which can be easily attached to a vehicle body.

[0002]

2. Description of the Related Art A conventional wiper device for a vehicle is composed of three parts: a wiper motor, a wiper link, and an assembly of a wiper arm and a wiper blade. For this reason, when assembling the wiper device to the vehicle body, it is necessary to assemble each of these three parts, and the workability has deteriorated. In order to solve this problem, a wiper device in which a wiper link is incorporated in a wiper motor and a wiper device in which the wiper motor and the wiper link are integrated with a frame or the like have been proposed. In these wiper devices as well, it is necessary to assemble an assembly of a wiper arm and a wiper blade after assembling a wiper motor having a built-in wiper link or an assembly in which the wiper motor and the wiper link are integrated with a frame or the like. When assembling the wiper arm and wiper blade assembly, the wiper motor must be properly stopped at the mounting position of the wiper arm and wiper blade assembly, and the wiper arm and wiper blade assembly must be attached to the windshield glass of the vehicle body. It is necessary to assemble with care that it is fixed after being aligned with the end face. For this reason, it is difficult to automate the assembly of the wiper device to the vehicle body,
There is a problem that workability is deteriorated because the work is manually performed. In addition, in an assembly in which the wiper motor and the wiper link are integrated by a frame or the like, there is a problem that the assembly itself becomes large and it is difficult to work.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a vehicle wiper device having a reduced size while improving workability by assembling a wiper arm, a link and a motor. The purpose is to do.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a fixing portion fixed to a vehicle body,
A housing section which is rotatable against the fixed part, the
A wiper arm formed integrally with the storage portion, a motor disposed in the storage portion, and a rotational force of the motor disposed in the storage portion converted into a swinging motion of the wiper arm and output to the fixed portion. comprising a conversion mechanism, a front
A housing in which the motor and the conversion mechanism are housed,
It is characterized in that the upper arm swings integrally with the fixed portion.

According to a second aspect of the present invention, the conversion mechanism comprises: a first gear provided on an output shaft of the motor;
A second gear meshed with the first gear and rotatably supported by the storage portion; a crank arm disposed on the second gear and rotating with the rotation of the second gear; The lever includes a lever having one end fixed to a portion of the fixing portion corresponding to the center of rotation of the wiper arm, and a rod connecting the other end of the lever to the crank arm.

[0006]

[Action] wiper arm of the present invention includes a retract and section, the wiper arm is rotatably provided on the fixed portion fixed to the vehicle body. A motor and a conversion mechanism for converting the rotation of the motor into a swinging motion of the wiper arm are arranged in the storage section. Therefore, the wiper arm can be caused to swing by rotating the motor while fixing the fixing portion to the vehicle body. In addition, since the motor and the conversion mechanism are housed in the housing portion and integrated with the wiper arm, the motor and the conversion mechanism can be mounted on the vehicle body simply by mounting the wiper blade to the vehicle body with the wiper arm mounted, thereby improving workability. Becomes better.

The above conversion mechanism is provided on the output shaft of a motor .
First gear that, a second gear meshed with the first gear, a crank arm that rotates with the second gear, one end connects the other end a crank arm fixed lever and lever fixing portion When the lever is constituted by a rod, a lever crank mechanism is constituted by a crank arm, a lever, and a rod. When the lever is fixed by fixing the fixing portion to the vehicle body, and the motor is rotated to rotate the crank arm via the first gear and the second gear, the wiper arm swings.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 schematically illustrates a wiper device according to the present embodiment. The wiper device includes a driver-side (Dr-side) wiper arm 10 having a storage case 14 that accommodates a swing mechanism at one end, and a wiper arm 10 similar to the above. Of the passenger (Pa) provided with a storage case 16 at one end for storing the swing mechanism of
Side) wiper arm 12. A wiper blade 18 is attached to the tip of the driver-side wiper arm 10, and a wiper blade 20 is attached to the tip of the passenger-side wiper arm 12. The swing mechanism housed in the housing cases 14 and 16 is connected to a control circuit 22 including a microcomputer so as to supply a pulse signal and a cam signal.
Is connected to the swing mechanism to control the swing mechanism. The control circuit 22 is connected with a wiper switch 26 for turning on and off the wiper device, an ignition switch 28 and a washer switch 30. Note that L represents the lower inversion position of the wiper blade, and U represents the upper inversion position of the wiper blade.

Next, the swing mechanism stored in the storage case of the wiper arm will be described in detail. The driver-side wiper arm 10 and the passenger-side wiper arm 12
Have the same configuration, only the driver-side wiper arm 10 will be described below, and the description of the passenger-side wiper arm 12 will be omitted.

As shown in FIGS. 2 and 3, the wiper arm 10 has a hook 32 formed at a distal end thereof for assembling a wiper blade, and a storage case 14 formed at a base end thereof for accommodating a swinging mechanism. It is configured to be bent around a pin 34 provided near the storage case 14.

As shown in FIGS. 4 and 5, a substantially triangular bracket 24 having three holes for attaching the wiper device to the vehicle body has a bracket 2 substantially at the center thereof.
The shaft 36 is fixed so as to be orthogonal to 4.
A bearing 35 is formed on the bottom surface of the storage case 14,
The shaft 36 extends through the bearing 35 from the bottom surface. Thus, the wiper arm 10 is rotatably supported on the shaft 36 at the storage case 14. One end of a lever 38 is fixed to a protruding portion of the shaft 36 from the bearing 35 by a nut or the like. A pin 40 is fixed to the other end of the lever 38.
The bracket 24, the shaft 36, the lever 38, and the pin 40 function as a fixing portion for fixing the wiper device to the vehicle body. A motor 4 is provided substantially at the center of the storage case 14.
2 is fixed, and the first shaft is
The worm gear 44 is fixed. A two-pole magnet 46 is formed between the worm gear 44 of the rotating shaft 43 and the commutator of the motor 42.
Are fixed so as to surround the rotation shaft 43. A Hall element 48 is arranged near the magnet 46 so as to face the outer periphery of the magnet 46. Therefore,
From the Hall element 48, a pulse signal shown in FIG. 7 which is a synchronization signal corresponding to the rotation of the motor is generated. Note that a pulse signal may be generated using a rotary encoder, an MRE element, or the like.

A helical gear 50 as a second gear meshing with the worm gear 44 is provided in the storage case 14.
Are rotatably mounted. One end of a crank arm 52 is fixed to the upper surface of the helical gear 50. A pin 54 is fixed to the other end of the crank arm 52. One end of the rod 56 is rotatably supported by the pin 54 and the other end is rotatably supported by the pin 40. As a result, the crank arm 52 and the lever 38 are connected by the rod 56, and the wiper arm 1
0, lever 38, crank arm 52 and rod 56 constitute a lever crank mechanism.

As shown in FIG. 6, on the lower surface of the helical gear 50, a cam plate 60 made of a conductive member constituting a position detector is fixed along the circumferential direction of the helical gear 50. A lower reversing projection 64 and an upper reversing projection 66 protruding in the direction of the rotation axis are formed on the cam plate 60 at positions facing each other with the rotation axis of the helical gear 50 interposed therebetween. A notch 6 is provided on the outer peripheral portion of the cam plate 60.
2A and 62B are formed, and are formed to be narrower than other portions. A first contact lever 72 is arranged at a position where it can contact the lower inversion protrusion 64 and the upper inversion protrusion 66, and a second contact lever 70 is arranged at a position where it can make contact with the outer peripheral portion of the cam plate 60. Cam plate 6
A grounded common contact lever 68 is arranged at a position where it can come into contact with the center of the zero. The first contact lever 72 is connected to the control circuit 22 via the inverter IN1, and the second contact lever 70 is connected to the control circuit 22 via the inverter IN2. Also,
The control circuit 22 includes the Hall element 48 described above.
Is connected.

When the common contact lever 68 and the second contact lever 70 are electrically connected by the cam plate 60 of the position detector with the rotation of the motor 42, the input end of the inverter IN2 is connected to the second contact lever 70 and the cam. Since it is grounded via the plate 60 and the common contact lever 68, as shown in FIG.
The cam signal 2 which is at a high level while the common contact lever 68 and the second contact lever 70 are electrically connected is output from the output end of.

From the inverter IN1, when the first contact lever 72 comes into contact with the lower inversion protrusion 64, the first
The cam signal 1 shown in FIG. 7 which becomes a high level when the contact lever 72 of FIG.

According to this position detector, the upper inversion position and the lower inversion position can be determined by the combination of the cam signal 1 and the cam signal 2. Note that the passenger-side position detector has the same configuration.

Next, the control circuit 22 will be described in detail with reference to FIG. The common brush of the driver-side motor 42D is connected to a vehicle-mounted battery via a fusible link. The high-speed brush of the driver-side motor 42D is connected to the H-contact of a driver-side speed changeover switch 76D composed of a relay, and the low-speed brush is connected to the L-contact of the driver-side speed changeover switch 76D. The common contact C of the driver-side speed changeover switch 76D is connected to the common contact C of the driver-side short-circuiting switch 78D formed by a relay. The common contact C is always connected to the B contact. The B contact of the driver-side short-circuit switch 78D is connected to the power supply, the A contact of the driver-side short-circuit switch 78D is connected to the drain of the driver-side FET 82D, and the input port of the microcomputer 88 via the driver-side current detector 80D. It is connected to the. The source of the driver-side FET 82D is grounded, and the gate is connected to the output port of the microcomputer 88 via the driver-side drive circuit 84D.

The passenger side motor 42P is connected in the same manner as the driver side motor 42D, and the passenger side is provided with a speed changeover switch 76P, a short circuit switch 78P, a current detector 80P, an FET 82P, and a drive circuit 84P similarly to the driver side. These are connected similarly to the driver side.

The power supply of the microcomputer 88 is as follows.
An input port is connected to the vehicle-mounted battery, and the passenger side position detector 74 outputs the cam signals 1 and 2 and the pulse signal of FIG. 7 in the same configuration as the driver side position detector 74D and the driver side position detector 74D described above. The switch 74P, the wiper switch 26, the ignition switch 28, and the washer switch 30 are connected. In addition, IN
3, IN4 is an inverter.

The operation of this embodiment will be described below. The wiper device of the present embodiment is attached to the vehicle body by attaching a wiper blade to the hook 32 of the wiper arm 10, inserting a bolt into the hole of the bracket 24, and tightening. After the position of the wiper arm with respect to the bracket is adjusted in advance, the swing mechanism is housed in the storage case, so that the position adjustment of the wiper arm or the like is unnecessary when assembling to the vehicle body, and only the bracket is attached to the vehicle body. . Thus, a lever crank mechanism including the lever 38, the rod 56, the crank arm 52, and the wiper arm 10 in which the lever 38 is a fixed link and the wiper arm 10 is a swing arm is configured. When the motor 42 is rotated by the control circuit 22 based on the operation of the wiper switch 26, the rotation of the motor is reduced and transmitted to the helical gear. When the helical gear 50 is rotated, the crank arm 52 rotates around one end. As a result, FIG.
The wiper arm 10 is swung about the shaft 36 as shown in FIGS. The operation on the passenger side is the same as that on the driver side.

Since a pulse signal and a cam signal are output from the Hall element 48 and the position detector with the rotation of the motor 42 and the helical gear 50, a wiping operation is performed based on these signals so that the wiper blade does not interfere. In order to control the wiper blade so as not to cause interference, the number of pulse signals of the driver side and the passenger side is counted, and if a count difference occurs, the motor with the faster wiping operation, that is, the motor with the larger count number Motor FET
Is turned off, the power is turned off to stop the motor, and when the count difference disappears, the power is turned on again to rotate the motor. The wiping operation control of the wiper blade is described in Japanese Patent Application No. Hei 3-105.
The method described in the specification of No. 976 can be used.

As described above, according to this embodiment, the swinging mechanism including the motor for swinging the wiper arm and the crank arm is housed in the wiper arm, and the wiper arm is rotatably mounted on the bracket, and the bracket is mounted on the bracket. Since the wiper device is assembled by fixing the wiper device to the vehicle body, the mounting operation can be performed only by bolting, so that the workability is improved, and the space for the conventional wiper link and motor is not required.

Although the present embodiment has been described with reference to two wiper arms, synchronous control is not required for a single wiper arm.

[0024]

As described above, according to the present invention, the swing mechanism including the motor, the crank arm, and the rod is housed in the housing portion formed on the wiper arm, and the wiper arm is rotatably supported by the fixed portion. In addition, the wiper device can be mounted on the vehicle body only by mounting the fixing portion on the vehicle body, thereby providing an effect of improving workability.

[Brief description of the drawings]

FIG. 1 is a schematic view of a wiper device according to an embodiment of the present invention.

FIG. 2 is a plan view of a wiper arm.

FIG. 3 is a front view of a wiper arm.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a cross-sectional view showing a state in which FIG. 4 is viewed from the front.

FIG. 6 is a schematic diagram of a driver-side detector.

FIG. 7 is a diagram showing waveforms of signals output from a Hall element and a position detector.

FIG. 8 is a block diagram showing details of a control circuit.

FIG. 9 is a schematic diagram for explaining the operation of the wiper blade.

[Explanation of symbols]

 10 Wiper arm 14 Storage case 36 Shaft 38 Lever 42 Motor 52 Crank arm 56 Rod

Claims (2)

(57) [Claims] And 1. A fixing portion fixed to the vehicle body, and a housing portion which is rotatable against the fixed part, and a wiper arm which is formed integrally with the housing portion, a motor disposed in said housing portion A conversion mechanism disposed in the storage section and configured to convert the rotational force of the motor into a swinging motion of the wiper arm and output to the fixed section; and a storage section in which the motor and the conversion mechanism are stored. And said
A wiper device for a vehicle, wherein the wiper arm integrally swings with respect to the fixed portion. 2. The conversion mechanism, comprising: a first gear provided on an output shaft of the motor; and a second gear meshed with the first gear and rotatably supported by the housing. A crank arm disposed on the second gear and rotating with the rotation of the second gear; a lever having one end fixed to a portion of the fixed portion corresponding to a rotation center of the wiper arm; The vehicle wiper device according to claim 1, further comprising: a rod connecting the other end and the crank arm.