JP2807676B2 - Vehicle wiper drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper driving device for a vehicle, and more particularly to a wiper driving device capable of switching a lower inverted position of a wiper arm. 2. Description of the Related Art In recent years, even when snow near the lower end of a windshield glass is clogged, a technique has been proposed in which the wiping angle can be switched in order to operate the wiper while avoiding the snow. -47560. [0003] Japanese Utility Model Laid-Open Publication No. 59-47560 discloses that
The second between the drive lever of the wiper arm and the wiper link
There is disclosed a technique in which the wiping angle can be changed by changing the angle between the second lever and the driving lever and screwing the same to change the wiping angle. However, the technology disclosed in the above publication is
Switching means (fixing screw in the above-mentioned publication) for changing the wiping angle is set on the drive lever, and the switching means reciprocates together with the drive lever. However, there is a problem that a large installation space is required. SUMMARY OF THE INVENTION In view of the above-mentioned problems in the prior art, the present invention provides a method for installing a switching means for switching a lower inversion position of a wiper arm between upper and lower positions.
Provided is a wiper drive device that can increase the degree of freedom of installation, can reduce the size of a drive lever portion that swings together with the wiper, and can reliably change and regulate the rotation angle of the drive shaft. The challenge is to do. In order to solve the above-mentioned problems, according to the first aspect of the present invention, the lower reversal position of the wiper arm and the wiper blade is set to the first lower reversal position and the first lower reversal position is raised. The vehicle wiper drive device that switches to the lower inverted position 2 is configured as described below. That is, a drive lever to which the drive shaft of the wiper arm is fixed, and a wiper link for transmitting the power of the motor to the drive lever are provided. [0008] The between the drive lever and the wiper link, a pivot lever pivotally supported on the pivot shaft located outside drive movement lever, on該回Do lever connecting shaft and on the drive lever A power transmission member comprising an intermediate link connecting the pivot and the shaft is provided. The power transmission member supports the wiper link so that the position of the rotation shaft is shifted between a first position corresponding to the first lower turning position and a second lower turning position. A switching means for selectively switching between two positions corresponding to the second position is coupled to the rotating lever, and the driving lever, the rotating lever, and the intermediate link are fixed between the driving shaft and the rotating shaft. was a configuration in which a double-lever machine configuration to a link. The switching means changes the position of the rotating shaft.
Any switching means for selectively switching between the first position and the second position may be used. For example, the switching may be performed using power of an electric motor, an electromagnetic coil, or the like. According to the second aspect of the present invention, a rotation shaft is provided at one end of a lever rotatably supported on a shaft disposed at a fixed point and crossing the rotation lever, and a center of the shaft disposed at the fixed point is provided. Set to the next position. That is, two positions occupied by the center of the rotating shaft at two positions, a first lower inversion position and a second lower inversion position, and a position occupied by the center of the connection shaft at the upper inversion position of the wiper arm and the wiper blade. The center of the fixed point arrangement axis is set on the bisector of the angle connecting the three positions, and the position of the rotation axis is switched without using an electric motor, an electromagnetic coil, and the like. Lost. According to the structure of the second aspect of the present invention, the switching means for switching the position of the rotating shaft can be arranged on the vehicle body side.
The switching means does not reciprocate together with the drive lever when the wiper is actuated as in the prior art, so that the installation space can be reduced, and the degree of freedom of position selection can be increased upon installation. The lever portion can be reduced in size, the rotation angle of the drive shaft can be reliably changed, and the angle can be regulated. An embodiment of a wiper driving apparatus for a vehicle to which both the first and second aspects of the present invention are applied will be described with reference to FIGS. In FIG. 3, reference numeral 1 denotes a windshield glass, and reference numeral 2 denotes a wiper blade for wiping its surface, which is supported by a wiper arm 3. Reference numeral 2a denotes an upper reversing position of the wiper blade 2, reference numeral 2b denotes a first lower reversing position, and reference numeral 2c.
Indicates a second lower inversion position that rises up from that. In FIGS. 1 and 2, reference numeral 4 denotes a drive shaft of the wiper arm 3 to which the wiper arm 3 is fixed. The drive shaft 4 is a fixed point with respect to the vehicle body, and is fixed to one end of the drive lever 5. A power transmission member for transmitting the driving force of the motor to the drive lever 5 is arranged between the drive lever 5 and the wiper link 7 pivotally supported by the crank 10 of the motor. The power transmission member includes a rotating lever 11,
Connecting shaft 9 on pivot lever 11 and pivot 8 on drive lever 5
Preparative are composed of intermediate link 6 which connects the pivoting lever 11 is pivoted located outside five kinematic lever shaft 13
Is pivoted to. In the illustrated embodiment, a wiper link 7 is pivotally supported on a connecting shaft 9 connecting the intermediate link 6 and the rotating lever 11, and the rotating shaft 13 intersects the longitudinal direction of the rotating lever 11. The switching lever 12 is provided at one end of the switching lever 12 arranged in a desired direction. The switching lever 12 is pivotally supported at an intermediate position by a shaft 14 with respect to the vehicle body, and the other end is urged by a resilient body 15 represented by a turnover spring as an example. In this case, the resilient body 15 is a compression coil spring, and the other end of the switching lever 12 is used as a pivot 16 to extend therefrom toward a pivot 17 which is a fixed point with respect to the vehicle body, and is loosely fitted to the pivot 17. Inserted into the bar 18 that has been cut. Because of the above structure, the motor crank
When 10 rotates in the direction of arrow C, reciprocation of wiper link 7
By the swing, the rotating lever 11 makes the rotating shaft 13 the center of rotation.
To reciprocate within the range indicated by arc D,
The drive shaft 4 also rotates around the axis of the drive shaft 4 via the intermediate link 6.
Being transmission reciprocating rocking angle theta ₁ of the range and the dynamic center
Therefore, the wiper arm 3 fixed to the drive shaft 4 also has the angle θ.
₁ reciprocating rocking, the window by the wiper blade 2
The wiping of the shield glass 1 is performed as shown in FIG.
It is. Reference numerals 19 and 20 denote a switching lever 12 fixed to the vehicle body, that is, a stopper for regulating the lower inversion position of the drive lever 5, and the stopper 19 is a first lower inversion position where the wiper arm 3 is lower. The stopper 20 regulates the stop position of the drive lever 5 when the wiper arm 3 occupies the second lower inversion position where the wiper arm 3 rises upward, ie, the stop position of the drive lever 5 when the wiper arm 3 rises upward. The position of the rotating shaft 13 is regulated. For this reason, the switching lever 12, the driving lever 5
Can be switched between two positions as shown in FIGS. When the switching is performed as shown in FIG. 1, the drive lever 5, the rotation lever 11 and the intermediate link 6 make a motion similar to the lever mechanism by using the drive shaft 4 and the rotation shaft 13 as fixed links, and the switching is performed as shown in FIG. When used, narrowed drive shaft 4, will be carried out luck <br/> movement of both lever Organization between pivot shaft 13 as a fixed link, only by changing the position of the pivot shaft,
Reliable change of the rotation angle of the drive shaft and regulation of the rotation angle are performed. [0023] Thus, the wiper arm 3 fixed to the drive shaft 4 in the state of FIG. 1 is rotated at an angle theta _1, the wiper blade 2 a first lower turning position 2b in wiping angle theta ₁ of the same angle
And becomes a to wipe the windshield glass 1 surface between the upper reversing position 2a, rotated at an angle theta ₂ in the state of FIG. 2, the wiper blade 2 slightly risen than the first lower turning position 2b Thus, the portion between the second lower inversion position 2c and the upper inversion position is wiped. Therefore, the wiper arm 3 and the wiper blade 2 are inverted under the hood panel 21 (FIG. 3) in the case of FIG. 1, but are inverted outside the hood panel 21 in the case of FIG. Becomes In the case of this embodiment, the position occupied by the center of the pivot shaft 13 of the pivot lever 11 when the wiper arm 3 occupies the first lower reversing position according to the second aspect of the present invention.
The position occupied by the center of the connecting shaft 9 when the wiper arm 3 occupies the upper inverted position, that is, the top dead center position, and the center of the rotating shaft 13 when the wiper arm 3 occupies the second lower inverted position. Assuming that the occupied position is a, the center of the axis 14 was set on the bisector of the angle ui. For this reason, even when the switching lever 12 is switched, the position of the top dead center c of the center of the connecting shaft 9 of the rotating lever 11 does not change before and after the switching, and the pivot 8 of the driving lever 5 does not change.
The position of the top dead center d hardly changes. Therefore,
The upper reversing position 2a of the wiper blade 2 is
Irrespective of the switching, the electric motor, the electromagnetic clutch and the like as switching means are not required. Note that, in FIGS.
Is a second drive shaft for rotating another wiper arm 3, which is a fixed point with respect to the vehicle body. The second drive shaft 22 is fixed to one end of a lever 23, and the other end of the lever 23 and the drive lever 5 are pivotally connected via a link 24. Symbol 25, 2
Reference numeral 6 denotes a pivot for connection with the link 24. Accordingly, the wiper blade 2 on the side of the second drive shaft 22 moves in the same manner as the wiper blade 2 described above. Of course, the same mechanism as the mechanism including the intermediate link 6 and the like may be interposed between the second drive shaft 22 and the link independently from the crank 10 of the motor. In order to use the wiper having the above configuration, the switching lever 12 is switched as shown in FIG. 1 during normal rainfall or the like. Next, when the motor is driven, the wiping at the wiping angle θ ₁ and the first lower inversion position 2b can be achieved as described above. In the case of snowfall or the like, the driving lever 5 does not rotate due to the resistance due to the snow in the hood panel 21, and the wiper link 7 tries to further rotate the intermediate link 6 with its pivot 8 as a fulcrum. 11 is pulled in the direction away from the switching lever 12 in the opposite direction or axis 14, so that automatically become the switching lever 12 is switched to the opposite side, the wiper arm 3 in wiping angle theta ₂ as in FIG. 2, and the second And the drive lever 5, the rotation lever 11, and the intermediate link 6 swing as a mechanism similar to a double lever mechanism in which a fixed link is provided between the drive shaft 4 and the rotation shaft 13. Therefore, the rotation angle of the wiper arm 3 is accurately regulated only by changing the position of the rotation shaft 13. It is needless to say that the switching lever 12 is provided by manually applying a rotational force to the wiper arm 3 in the direction of arrow B in FIG.
Can be switched to the opposite side. The operation of returning the position of the switching lever 12 shown in FIG. 2 to the position shown in FIG. 1 is performed by manually turning the wiper arm 3 in the direction of arrow A as shown in FIG. It is done by doing. With this rotational force,
The rotating lever 11 is pushed in the direction of the switching lever 12, and as a result, the switching lever 12 returns to the position shown in FIG. According to the first aspect of the present invention, since the position of the rotation axis of the rotation lever pivotally supported by the intermediate link is switched, the position of the switching means can be changed to a desired position on the vehicle body side. The position can be set, the arrangement space can be reduced, and the degree of freedom in installation can be increased. Further, the rotating shaft is arranged at a position outside the drive lever, and the drive lever is merely assembled with an intermediate link connected by a pivot, so that the drive lever can be downsized. The drive lever, the rotation lever, and the intermediate link are double levers having a fixed link between the drive shaft and the rotation shaft.
Since the swing is formed and formed, there is an effect that the rotation angle of the drive shaft can be surely changed and the rotation angle can be regulated. According to the second aspect of the present invention, only the lower inversion position of the wiper arm and the wiper blade can be switched between the first and second positions without changing the upper inversion position. This has the effect of making it unnecessary to use a motor or an electromagnetic clutch.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a switching mechanism in a first lower inversion position state. FIG. 2 is an explanatory diagram of a switching mechanism in a second lower turning position state. FIG. 3 is a schematic front view showing a relationship between a windshield glass and a wiper. [Description of Signs] 2 Wiper blade 3 Wiper arm 4 Drive shaft 5 Drive lever 6 Intermediate link 7 Wiper link 8 Axis 9 Connecting shaft 11 Rotating lever 12 Switching lever 13 of switching means Rotating shaft 14 Axis of fixed point arrangement The center position of the rotating shaft 13 at the inverted position. The center position of the rotating shaft 13 at the second lower inverted position. The center position of the connecting shaft 9 at the upper inverted position.

Claims (1)

(57) [Claims] Lower the inverted position of the wiper arm and wiper blade,
In a vehicle wiper drive device that switches between a first lower inversion position and a second lower inversion position that rises, a drive lever to which a drive shaft of a wiper arm is fixed, and transmission of motor power to the drive lever and a wiper link, between the front SL drive lever and the wiper link,
A pivot lever pivotally supported on the pivot shaft located outside drive movement lever, a power transmission member made of an intermediate link is provided for connecting the pivot on the drive lever and the connecting shaft on該回Do lever The power transmission member supports the wiper link, and the position of the rotation shaft corresponds to a first position corresponding to the first lower inverted position and a second position corresponding to the second lower inverted position. Switching means for selectively switching between two positions, a second position and a second position, is connected to the rotation lever, and the drive lever, the rotation lever, and the intermediate link fix the space between the drive shaft and the rotation shaft. configuration to have a wiper drive apparatus for a vehicle both lever Organization to link. 2. A rotating shaft is provided at one end of a lever rotatably supported on the fixed-point arranged shaft and intersecting with the rotating lever, and the center of the fixed-point arranged shaft is in a first lower inversion position. And a second lower inversion position, two positions occupied by the center of the rotating shaft, and a position occupied by the center of the connecting shaft in the upper inversion position of the wiper arm and the wiper blade.
The vehicle wiper driving device according to claim 1, wherein the wiper driving device is set on a bisector of an angle connecting the positions.