JP2018094981A - Vehicle wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle wiper device that can vary a wiping-out range excellently.SOLUTION: A vehicle wiper device 2 comprises: a first driving lever 26 that is supported with a first shaft line L1 as a center and turned by a first motor 11; a second driving lever 29 that is supported with a second shaft line L2 as a center and turned by a second motor 12; a first driven lever 32 connected with a third shaft line L3 of the first driving lever 26 as a center; an arm head 33 connected with a fourth shaft line L4 of the first driven lever 32 as a center and connected with a fifth shaft line L5 of the second driving lever 29 as a center; a first wiper arm 35 that operates together with the arm head 33 and is connected with a first wiper blade; and a second wiper arm 17 which is connected with a second wiper blade 18 whose tip part is arranged at an upper side of the first wiper blade while being at a lower reversing position, where turning speed of the second wiper blade 18 from the lower reversing position is set faster than turning speed of the first wiper blade.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle wiper device.

  As a vehicle wiper device installed in a vehicle such as an automobile, the wiper arm and wiper blade are rotated around one point, and a four-bar linkage mechanism is provided to simplify the wiping range of the front window (wiping surface). There are some which have a desired range (a range that is substantially enlarged) different from a fan-shaped sector (see, for example, Patent Document 1).

  When such a vehicle wiper device reciprocally rotates a main lever (drive lever) supported rotatably with respect to the vehicle body on the lower end side (ground side) of the front window by the driving force of the drive source, As the other levers including the arm head are driven and rotated by the driving force of the main lever (drive lever), it is possible to wipe away a portion closer to the upper corner of the front window than a simple fan shape.

Japanese Patent Laid-Open No. 11-227572

  However, in the vehicle wiper device using the four-link mechanism as described above, the wiping range that can be expanded is a range that is uniquely set by each lever, and the wiping range cannot be varied.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle wiper device capable of satisfactorily changing the wiping range.

  In the vehicle wiper device that solves the above-described problem, a base end portion is supported so as to be rotatable about a first axis located at a fixed position with respect to a vehicle body, and is rotated by a driving force of a first drive source. A drive lever, a second drive lever that is supported by a driving force of a second drive source and is supported by a base end so as to be rotatable about a second axis at a fixed position with respect to the vehicle body; A first driven lever having a base end side coupled to be rotatable about a third axis on the distal end side of the first drive lever, and a fourth axis on the distal end side of the first driven lever. And a second driven lever having a distal end connected to be rotatable about a fifth axis on the distal end side of the second drive lever, and a second driven lever that operates integrally with the second driven lever. For wiping back and forth between the upside down positions of the wiping surface A first wiper arm to which one wiper blade is connected to the tip portion, and a second wiper arm to which a second wiper blade for reciprocating wiping between the upside down positions of the wiping surface is connected to the tip portion, and a lower inversion position The rotation speed of the second wiper blade is set so as to be faster than the rotation speed of the first wiper blade.

  According to this configuration, for example, when the wiping operation by the first wiper blade is performed by rotating the first drive lever with the driving force of the first drive source, the second drive lever is defined as the first drive source. The wiping range of the first wiper blade is expanded by rotating the driving force of another second driving source to move the fifth axis on the tip side of the second driving lever to the upper side of the wiping surface. Is possible. When the wiping range is expanded from the lower reversal position in this way, the first wiper blade is operated by pushing up the first wiper blade by the operation of moving the fifth axis upward. The rotational speed (moving speed) of is increased. In contrast, in this configuration, the rotational speed of the second wiper blade from the lower inversion position is intentionally set to be higher than the rotational speed of the first wiper blade. It is suppressed that the first wiper blade catches up and contacts the second wiper blade arranged on the upper side in the vicinity of the lower inversion position when heading.

  In the vehicle wiper device, the second wiper arm is rotated by a driving force of the first drive source, and a first drive connection mechanism that drives and connects the first drive source and the first drive lever; The rotational speed of the second wiper blade from the lower inversion position is changed by changing the mechanism reduction ratio of the second drive connection mechanism that drives and connects the first drive source and the second wiper arm. It is preferably set so as to be faster than the rotational speed of the blade.

  According to this configuration, since the second wiper arm is rotated by the driving force of the first driving source, the first driving source for rotating the first driving lever can be shared. The mechanism reduction ratios of the first drive connection mechanism that drives and connects the first drive source and the first drive lever and the second drive connection mechanism that drives and connects the first drive source and the second wiper arm are different. Thus, since the rotation speed of the second wiper blade from the lower reversal position is set to be faster than the rotation speed of the first wiper blade, for example, the contact described above is suppressed. That is, by setting the mechanism reduction ratio of the first drive coupling mechanism and the mechanism reduction ratio of the second drive coupling mechanism, the wiping range by the first wiper blade can be expanded while sharing the first drive source, and The first wiper blade is prevented from catching up and contacting the second wiper blade in the vicinity of the lower inversion position when going to the upper inversion position.

  In the above vehicle wiper device, the second wiper arm is rotated by a driving force of a third drive source, and the rotational speed of the first drive source is different from the rotational speed of the third drive source. It is preferable that the rotation speed of the second wiper blade from the lower reverse position is set to be faster than the rotation speed of the first wiper blade.

  According to this configuration, the second wiper arm is rotated by the driving force of the third drive source, and the lower rotational speed of the first drive source is different from that of the third drive source. Since the rotation speed of the second wiper blade from the reverse position is set to be faster than the rotation speed of the first wiper blade, for example, the above contact is suppressed.

  In the vehicle wiper device, it is preferable that a part of the second wiper blade is disposed on an upper side in a direction along the wiping surface of the first wiper blade in a state in which the second wiper blade is in a lower inverted position.

  According to this configuration, the second wiper blade is partially disposed on the upper side in the direction along the wiping surface of the first wiper blade in the state where the second wiper blade is in the lower reverse position. If the first wiper blade catches up with the second wiper blade in the vicinity of the reversal position, it may come into contact, but this can be suppressed.

  According to the vehicle wiper device of the present invention, the wiping range can be varied favorably.

The partial schematic diagram of the vehicle provided with the vehicle wiper apparatus in one Embodiment. The top view of the vehicle wiper apparatus in one Embodiment. Sectional drawing along the AA line of FIG. The top view for demonstrating operation | movement of the vehicle wiper apparatus in one Embodiment. The top view for demonstrating operation | movement of the vehicle wiper apparatus in one Embodiment. The top view for demonstrating operation | movement of the vehicle wiper apparatus in one Embodiment. The top view for demonstrating operation | movement of the vehicle wiper apparatus in one Embodiment. The characteristic view of the time-mechanism reduction ratio in one embodiment. The partial schematic diagram of the vehicle provided with the vehicle wiper apparatus in another example.

Hereinafter, an embodiment of a vehicle including a vehicle wiper device will be described with reference to FIGS.
As shown in FIG. 1, a vehicle wiper device 2 is disposed below a front window 1 (in the ground direction) as a wiping surface of the vehicle. The front window 1 has a black ceramic area 1a (shaded portion in FIG. 1) colored black at the edge.

  As shown in FIGS. 2 and 4 to 7, the vehicle wiper device 2 includes a plate-shaped central frame 3 and a pair of ends fixed to the central frame 3 so as to extend from the central frame 3 to both sides in the vehicle width direction. Pipe frames 4, 5, and first and second holder members 6, 7 fixed to the other ends of the pipe frames 4, 5. In the vehicle wiper device 2, the support portion 3 a provided on the central frame 3 is supported by the vehicle, and the fixing portions 6 a and 7 a formed on the first and second holder members 6 and 7 are fastened to the vehicle. Thus, it is fixed to the vehicle (its vehicle body).

Further, the vehicle wiper device 2 includes a first motor 11 as a first drive source and a second motor 12 as a second drive source that are fixed to the back surface (the surface on the inner side of the vehicle) of the central frame 3. .
The rotation shaft 11a of the first motor 11 passes through the central frame 3 and protrudes from the surface of the central frame 3 (surface on the outside of the vehicle), and the first drive crank arm 13 is fixed to the tip of the rotation shaft 11a. Has been. The rotating shaft 12a of the second motor 12 passes through the central frame 3 and protrudes from the surface of the central frame 3 (surface on the outside of the vehicle), and a second drive crank arm 14 is provided at the tip of the rotating shaft 12a. Is fixed. Here, the second motor 12 is controlled so that the rotation shaft 12a can rotate forward and backward at a rotation angle (predetermined rotation angle in this embodiment) of less than one rotation, and the rotation speed can also be controlled. It is a motor (DC motor with brush or brushless motor). Each of the first motor 11 and the second motor 12 has a magnetic sensor (such as a magnetoresistive element) inside, and the magnetic sensor is fixed to, for example, a worm wheel that rotates integrally with the rotary shafts 11a and 12a. By sensing the magnetism of the sensor magnet, a rotation position signal corresponding to the rotation position (rotation angle) of the rotation shafts 11a and 12a can be output.

  A driver seat side pivot shaft 15 is rotatably supported by the first holder member 6, and the driver seat side pivot shaft 15 has a base end portion (the end portion on the back side in FIG. 2) at the driver seat. The side swing lever 16 is fixed, and the driver seat side second wiper arm 17 (the arm head thereof) is fixed to the tip of the driver seat side pivot shaft 15 (the end on the front side in FIG. 2). Yes. As shown in FIG. 1, a second wiper blade 18 for wiping the driver's seat side of the front window 1 is connected to the distal end portion of the second wiper arm 17.

  The front end of the first drive crank arm 13 and the driver seat side swing lever 16 are connected by a first connecting rod 19. As a result, when the first motor 11 is driven, the first drive crank arm 13 rotates, and the power is transmitted to the driver seat side swing lever 16 via the first connecting rod 19 so that the driver seat side swing is performed. The movable lever 16 swings, the second wiper arm 17 swings together with the driver seat side swing lever 16, and the second wiper blade 18 causes the driver seat side upper reversal position and lower reversal position of the front window 1. The range between is reciprocated. In FIG. 1, the normal wiping range H <b> 1 by the second wiper blade 18 is illustrated by a one-dot chain line.

  As shown in FIG. 3, the second holder member 7 supports a first passenger seat side pivot shaft 21 so as to be rotatable about the first axis L <b> 1, and a second passenger seat side pivot shaft 22. Is supported so as to be rotatable about the second axis L2. In the present embodiment, the first axis L1 and the second axis L2 are arranged on the same straight line L (concentric).

  Specifically, the cylindrical portion 7b is formed in the second holder member 7, and the first passenger seat side pivot shaft 21 is rotatably supported via a bearing 23 on the inner peripheral side thereof. The first passenger seat side pivot shaft 21 is formed in a cylindrical shape, and a second passenger seat side pivot shaft 22 is rotatably supported via a bearing 24 on the inner peripheral side thereof. As a result, the first axis L1 of the first passenger seat side pivot shaft 21 and the second axis L2 of the second passenger seat side pivot shaft 22 are respectively in a fixed position (non-moving position) with respect to the vehicle body. It is arranged on a straight line L.

  A first passenger seat side swing lever 25 is fixed to the base end portion of the first passenger seat side pivot shaft 21, and a first drive lever 26 is fixed to the distal end portion of the first passenger seat side pivot shaft 21. Has been. As shown in FIG. 2, the first passenger seat side swing lever 25 and the driver seat side swing lever 16 are drivingly connected by a second connecting rod 27. Accordingly, when the first motor 11 is driven and the driver seat side swing lever 16 swings as described above, the driving force is applied to the first passenger seat side swing lever 25 via the second connecting rod 27. As a result, the first passenger seat side swing lever 25 swings, and together with the first passenger seat side swing lever 25, the first drive lever 26 swings (rotates) around the first axis L1.

  As shown in FIG. 3, the second passenger seat side pivot shaft 22 is formed longer than the first passenger seat side pivot shaft 21, and the base end portion and the distal end portion thereof are the first passenger seat side pivot shaft 21. The second passenger seat side swing lever 28 is fixed to the base end portion thereof, and the second drive lever 29 is fixed to the front end portion of the second passenger seat side pivot shaft 22. .

  The distal end portion of the second drive crank arm 14 and the second passenger seat side swing lever 28 are connected by a third connecting rod 31. As a result, when the second motor 12 is driven, the second drive crank arm 14 is rotated, and the power is transmitted to the second passenger seat side swing lever 28 via the third connecting rod 31. 2 The passenger seat side swing lever 28 swings, and the second drive lever 29 swings (rotates) together with the second passenger seat side swing lever 28. The first passenger seat side pivot shaft 21 and the second passenger seat side pivot shaft 22 are not linked to each other. In other words, the first passenger seat side pivot shaft 21 and the second passenger seat side pivot shaft 22 are arranged on the same straight line L, but their rotation operations are independent of each other. In FIGS. 2 and 4 to 7, the waterproof cover K is illustrated on the second holder member 7, but the waterproof cover K is not illustrated in FIG. 3.

  2 and 4-7, the vehicle wiper device 2 has a first end connected to the base end so as to be rotatable about a third axis L3 on the front end side of the first drive lever 26. One follower lever 32 is provided.

  Further, the vehicle wiper device 2 is connected to the base end side so as to be rotatable about the fourth axis L4 at the tip end side of the first driven lever 32, and is located at the tip end side of the second drive lever 29. An arm head 33 is provided as a second driven lever that is pivotably connected to the front end side about a 5-axis line L5 (swing center axis). As shown in FIG. 1, the arm head 33 constitutes a first wiper arm 35 together with a retainer 34 connected to the distal end portion thereof, an arm piece (not shown), and the like, and a front window 1 is disposed at the distal end portion of the first wiper arm 35. A first wiper blade 36 for wiping the passenger side is connected.

  The first drive lever 26, the second drive lever 29, the first driven lever 32, and the arm head 33 have a length from the first axis L1 (the second axis L2) to the third axis L3, and The lengths from the fourth axis L4 to the fifth axis L5 are set and connected so as to be the same. The first drive lever 26, the second drive lever 29, the first driven lever 32, and the arm head 33 have a length from the third axis L3 to the fourth axis L4 and the first axis L1 ( The lengths from the second axis L2) to the fifth axis L5 are set and connected so as to be the same. That is, they are a parallelogram-shaped link mechanism in which the first drive lever 26 and the arm head 33 are kept parallel, and the second drive lever 29 and the first driven lever 32 are kept parallel. In the present embodiment, the first driving lever 26, the first driven lever 32, and the arm head 33 are driven by the driving force of the first motor 11, and the first wiper arm 35 is swung back and forth. A dynamic link mechanism is configured. In the present embodiment, the second drive lever 29 is an expansion / contraction mechanism that is driven by the driving force of the second motor 12 to expand and contract the first wiper arm 35 in the longitudinal direction. An axis moving mechanism for moving the axis (fifth axis L5) in the vertical direction of the front window 1 is configured.

  From the above configuration, the vehicle wiper device 2 rotates the first drive lever 26 by the driving force of the first motor 11 and moves the second drive lever 29 to the first when the wiping operation by the first wiper blade 36 is performed. The wiping range of the first wiper blade 36 is expanded (variable) by rotating by the driving force of the two motors 12 and moving the fifth axis L5 on the tip side of the second drive lever 29 to the upper side of the front window 1. ) Is possible.

  As shown in FIG. 1, the vehicle wiper device 2 of the present embodiment uses the position of the fifth axis L5 when the first wiper blade 36 is in the lower inverted position on the front window 1 as a reference position. A reference drive in which the wiping range by the first wiper blade 36 in a state where the axis L5 is at the reference position is the reference range Z1, and the fifth wiper L5 is moved to the upper side of the front window 1 from the reference position, and the first wiper. A control unit 41 that controls the driving of the first motor 11 and the second motor 12 so as to be able to switch between the expansion driving in which the wiping range by the blade 36 is an expansion range Z2 that is expanded from the reference range Z1. I have. The controller 41 is electrically connected to each of the first motor 11 and the second motor 12, and a rotation position signal (drive) corresponding to the rotation position (rotation angle) of the rotation shafts 11a and 12a input from the first motor 11 and the second motor 12. The first motor 11 and the second motor 12 are driven and controlled based on the status signal. Specifically, when the position of the fifth axis L5 when the first wiper blade is in the lower reverse position is set as the reference position, the control unit 41 drives and controls the first motor 11 in the reference drive (at this time, the first 2 motor 12 is in a stopped state), and the reference range Z1 is wiped off by the first wiper blade 36 in a state where the fifth axis L5 is at the reference position (the position in FIGS. 2 and 7). In other words, in the reference drive, the control unit 41 does not swing (rotate) the second drive lever 29 around the second axis L2 (without driving the expansion / contraction mechanism (axis movement mechanism)), and the fifth axis The reference range Z1 is wiped by the first wiper blade 36 while keeping L5 at the reference position (only the swing mechanism (swing link mechanism) is driven). On the other hand, in the expansion drive, the control unit 41 drives and controls the first motor 11 and the second motor 12 (by driving the telescopic mechanism (shaft moving mechanism) and the swinging mechanism (swinging link mechanism)), The fifth axis L5 on the distal end side of the second drive lever 29 is moved to the upper side of the front window 1 with respect to the reference position (see FIGS. 1 and 4 to 6) (or while being moved). The wiper blade 36 wipes the enlarged range Z2 that is larger than the reference range Z1.

  Further, the control unit 41 of the present embodiment normally operates when the first wiper blade 36 moves forward (when moving from the stop position along the lower end of the front window 1 or from the lower reverse position to the upper reverse position) and backward movement. The second motor 12 is drive-controlled so that the enlargement drive is performed at the time (when moving from the upper reverse position to the stop position or the lower reverse position). Note that, in the enlargement drive, the control unit 41 simultaneously rotates the first drive lever 26 with the driving force of the first motor 11 and moves (rotates) the first wiper blade 36 at the same time. 2 The motor 12 is driven and controlled so that the first wiper blade 36 wipes to a position near the upper corner of the front window 1. That is, when the control unit 41 moves the first wiper blade 36 to a position corresponding to the upper corner in the front window 1 based on the rotational position signals from the first motor 11 and the second motor 12, The second motor 12 is driven and controlled so that the fifth axis L5 located on the distal end side of the drive lever 29 and serving as the rotation center of the first wiper blade 36 approaches the corner side.

  In addition, the second motor 12 and the second drive lever 29 are configured so that the rotation shaft 12a of the second motor 12 can be moved even if a rotational force is applied to the second drive lever 29 in a state where the fifth axis L5 is at the reference position. It is connected via a link mechanism (second drive crank arm 14, third connection rod 31, and second passenger seat side swing lever 28) set so as to be a dead center that cannot be rotated. That is, the second drive crank arm 14, the third connecting rod 31, and the second passenger seat side swing lever 28 are in the state where the fifth axis L5 is at the reference position (see FIGS. 2 and 7). These connecting axis lines A1 and A2 and the axis line A3 of the rotating shaft 12a of the second motor 12 are set so as to be in a straight line when viewed from their axial directions. Therefore, for example, the fifth axis L5 can be mechanically held at the reference position without causing the second motor 12 to generate a holding torque. Therefore, for example, even if the second motor 12 fails, the fifth axis L5 is held at the reference position, so that the reference drive can be performed even if the enlargement drive is disabled.

  Further, in the vehicle wiper device 2 of the present embodiment, when the first motor 11 is driven, the first drive lever 26 swings (rotates) within a range below the front window 1 relative to the first axis L1. In other words, it is set so as not to swing (turn) above the first axis L1.

  Here, the second wiper blade 18 on the driver's seat side according to the present embodiment is in a state of being in the lower reversal position (stop position), and the tip side thereof is in a direction along the surface of the front window 1 of the first wiper blade 36. It is arranged on the upper side. In other words, the top end side of the second wiper blade 18 and the base end side of the first wiper blade 36 are overlapped in the vertical direction in the direction along the surface of the front window 1 in a state of being in the lower inversion position (stop position). It is set to have a range W. Further, the wiping range H1 of the second wiper blade 18 includes all the movement trajectory X of the base end portion of the first wiper blade 36 (however, the second wiper blade 18 is lower than the lower reverse position (stop position) of the second wiper blade 18). The length and the lap range W are set such that the movement trajectory of the part is excluded). Thereby, there is no wiping-out range inside the wiping range by the first wiper blade 36 (that is, the expansion range Z2).

The rotational speed of the second wiper blade 18 from the lower reverse position (stop position) is set to be faster than the rotational speed (moving speed) of the first wiper blade 36.
Specifically, in the present embodiment, a first drive connection mechanism that drives and connects the first motor 11 and the first drive lever 26, and a second drive connection mechanism that drives and connects the first motor 11 and the second wiper arm 17. The rotational speed of the second wiper blade 18 from the lower reversal position is set to be faster than the rotational speed of the first wiper blade 36 by making the mechanism reduction ratios different. In the present embodiment, the first drive connecting mechanism includes the first drive crank arm 13, the first connecting rod 19, the driver seat side swing lever 16, the second connection rod 27, and the first passenger seat side swing lever. The second drive coupling mechanism is a link mechanism including the first drive crank arm 13, the first coupling rod 19, and the driver seat side swing lever 16. The mechanism reduction ratio of the first drive coupling mechanism is a value obtained by dividing the rotation speed of the first motor 11 by the rotation speed of the first drive lever 26 (can be read as the movement speed of the first wiper blade 36). The mechanism reduction ratio of the two-drive connection mechanism is a value obtained by dividing the rotational speed of the first motor 11 by the rotational speed of the second wiper arm 17 (can be read as the moving speed of the second wiper blade 18). Then, the mechanism reduction ratio of the first drive coupling mechanism from the lower reverse position is set to be larger than the mechanism reduction ratio of the second drive connection mechanism, and the rotational speed of the second wiper blade 18 from the lower reverse position is set. Is set to be faster than the rotational speed of the first wiper blade 36, that is, the first wiper blade 36 does not catch up with the second wiper blade 18.

  Specifically, as shown in FIG. 8, the mechanism reduction ratio G1 of the first drive coupling mechanism and the mechanism reduction ratio G2 of the second drive coupling mechanism of the present embodiment are at the lower inversion position (timing T1 in FIG. 8). The mechanism reduction ratio G1 of the first drive coupling mechanism (at a position near the lower inversion position including the lower inversion position) is set to be larger than the mechanism reduction ratio G2 of the second drive coupling mechanism. Further, the mechanism reduction ratios G1 and G2 are equal at about half of the position between the upside down positions, and the second drive coupling mechanism is located at a position in the vicinity of the upside position including the upper inversion position (timing T2 in FIG. 8). The mechanism reduction ratio G2 is set to be larger than the mechanism reduction ratio G1 of the first drive coupling mechanism. FIG. 8 shows the mechanism reduction ratios G1 and G2 when the vehicle wiper device 2 reciprocates once, and the first and second wiper blades 36 and 18 are in the lower inverted position at the timing T1. Yes, at the time T2, it is in the upper inversion position.

Next, the operation of the vehicle wiper device 2 configured as described above will be described.
The second wiper arm 17 and the second wiper blade 18 simply rotate (swing) around the driver's seat side pivot shaft 15 when the first motor 11 is driven. The movement of the first wiper arm 35 and the first wiper blade 36 will be described in detail.

  For example, as shown in FIG. 2, when the washer switch provided in the driver's seat is operated with the first wiper arm 35 (and the first wiper blade 36) in the stop position, the control unit 41 One motor 11 is driven, and the first driving lever 26 is rotated by the driving force. At this time, the control unit 41 also drives the second motor 12 to perform the enlargement operation.

  At this time, first, as shown in FIG. 4, the first drive lever 26 is rotated until the first wiper arm 35 (and the first wiper blade 36) is moved forward by about 1/4 between the upside down positions. The second drive lever 29 is also rotated so that the fifth axis L5 is moved to the upper side of the front window 1. Thereby, the front-end | tip part of the 1st wiper blade 36 (refer FIG. 1) is moved upwards along the width direction edge part of the front window 1, and the front window 1 is wiped off.

  At this time, as described above, the rotation speed of the second wiper blade 18 from the lower reverse position (stop position) is set to be faster than the rotation speed (movement speed) of the first wiper blade 36. The first wiper blade 36 is prevented from catching up and contacting the second wiper blade 18.

  Then, as shown in FIG. 5, the first drive lever 26 is further rotated until the first wiper arm 35 (and the first wiper blade 36) is moved about halfway between the upside down positions. The second drive lever 29 is also rotated so that the 5-axis line L5 is moved further upward. As a result, as shown in FIG. 1, the front end portion of the first wiper blade 36 is moved to a position near the upper corner of the front window 1 and the front window 1 is wiped away.

  Then, as shown in FIG. 6, until the first driving lever 26 is further rotated and the first wiper arm 35 (and the first wiper blade 36) is moved forward by about 3/4 between the upside down positions. The second drive lever 29 is also rotated (in the reverse direction) so that the fifth axis L5 is moved to the lower side of the front window 1. Thereby, the front-end | tip part of the 1st wiper blade 36 (refer FIG. 1) is moved to the width direction (left direction in FIG. 1) substantially along the upper end of the front window 1, and the front window 1 is wiped off.

  As shown in FIG. 7, the fifth axis L5 is further lowered until the first drive lever 26 is further rotated and the first wiper arm 35 (and the first wiper blade 36) finishes the forward movement. The second drive lever 29 is also rotated (in the reverse direction) so as to be moved to the reference position. Accordingly, the enlarged range Z2 of the front window 1 is wiped by the first wiper blade 36 (see FIG. 1).

During the backward movement, the enlarged range Z2 is wiped by the first wiper blade 36 (see FIG. 1) due to the movement opposite to the forward movement described above.
Next, the effect of the said embodiment is described below.

  (1) In the above configuration, when the first drive lever 26 is rotated by the driving force of the first motor 11 and the wiping operation by the first wiper blade 36 is performed, the second drive lever 29 is moved to the first motor 11. The wiping range by the first wiper blade 36 by rotating by the driving force of another second motor 12 and moving the fifth axis L5 on the front end side of the second drive lever 29 to the upper side of the front window 1. Can be magnified satisfactorily (enlarged range Z2). Therefore, it is possible to wipe up to a position near the upper corner of the front window 1. When the wiping range is expanded from the lower reversal position in this way, the first wiper blade 36 is pushed up by the movement of the fifth axis L5 upward, and the first wiper blade 36 is pushed up. The rotation speed (movement speed) of the wiper blade 36 is increased. On the other hand, in this configuration, the rotational speed of the second wiper blade 18 from the lower reverse position is intentionally set to be higher than the rotational speed of the first wiper blade 36. It is possible to prevent the first wiper blade 36 from catching up and contacting the second wiper blade 18 in the vicinity of the lower inversion position when heading.

  (2) Since the second wiper arm 17 (second wiper blade 18) is rotated by the driving force of the first motor 11, the first motor 11 that rotates the first drive lever 26 may be shared. it can. The mechanism reduction ratios of the first drive coupling mechanism for drivingly coupling the first motor 11 and the first drive lever 26 and the second drive coupling mechanism for drivingly coupling the first motor 11 and the second wiper arm 17 are made different. Thus, the rotation speed of the second wiper blade 18 from the lower inversion position is set to be higher than the rotation speed of the first wiper blade 36, so that the contact is suppressed. That is, the first wiper blade is shared while the first motor 11 is shared by setting the mechanism reduction ratio G1 (see FIG. 8) of the first drive coupling mechanism and the mechanism reduction ratio G2 (see FIG. 8) of the second drive coupling mechanism. The wiping range by 36 can be expanded, and the first wiper blade 36 catches up and contacts the second wiper blade 18 in the vicinity of the lower inversion position is suppressed.

The above embodiment may be modified as follows.
In the above embodiment, the rotational speed of the second wiper blade 18 from the lower inversion position is changed by the rotation of the first wiper blade 36 by changing the mechanism reduction ratio between the first drive connection mechanism and the second drive connection mechanism. Although it is set to be faster than the moving speed, it may be changed to another configuration as long as it is set to operate similarly.

  For example, it may be changed as shown in FIG. In this example, a first motor 51 for driving the first drive lever 26 is provided immediately below the base end side of the first drive lever 26, and the rotation axis of the first motor 51 is the axis of the first drive lever 26. It is directly connected to a certain first passenger seat side pivot shaft 21 (see FIG. 3). Further, the second wiper arm 17 (second wiper blade 18) is configured to be rotated by the driving force of the third motor 52 as a third driving source, and the third motor 52 is based on the second wiper arm 17. Provided immediately below the end side, the rotation shaft of the third motor 52 is directly connected to the driver seat side pivot shaft 15 which is the shaft of the second wiper arm 17.

  And the control part 53 which drive-controls the 1st motor 51, the said 2nd motor 12, and the 3rd motor 52 makes the rotation speed of the 1st motor 51 and the rotation speed of the 3rd motor 52 different, and is a lower inversion position. The rotational speed of the second wiper blade 18 is set to be faster than the rotational speed of the first wiper blade 36. This also suppresses the first wiper blade 36 from catching up and contacting the second wiper blade 18 in the vicinity of the lower inversion position. Further, the rotation shaft of the first motor 51 is directly connected to the first drive lever 26 (its shaft), and the rotation shaft of the third motor 52 is directly connected to the second wiper arm 17 (its shaft). A mechanism or the like (the first drive coupling mechanism or the second drive coupling mechanism of the above embodiment) is not necessary.

  In the above embodiment, the control unit 41 controls the drive of the first motor 11 and the second motor 12 so that the same enlargement drive is performed both during the forward movement and during the backward movement. For example, different control may be performed at the time of forward movement and at the time of backward movement. Further, when it is not normal time such as during snowfall, drive control different from the above embodiment (enlarged drive) may be performed.

  In the above embodiment, the first axis L1 of the first drive lever 26 and the second axis L2 of the second drive lever 29 are arranged on the same straight line L. However, the present invention is not limited to this. It is good also as a structure arrange | positioned in the position which the 1st axis line L1 of 1 drive lever and the 2nd axis line L2 of the 2nd drive lever shifted | deviated.

  -The control part 41 which controls the drive of the said 1st motor 11 and the 2nd motor 12 of the said embodiment may be mounted as ECU of the vehicle side, for example, at least one of the 1st motor 11 and the 2nd motor 12, for example, It is good also as a control part carried in the 2nd motor 12.

  In the above embodiment, of the first motor 11 and the second motor 12, the second motor 12 is a motor that is controlled so as to be able to rotate forward and backward. However, the present invention is not limited to this, and the first motor 11 is rotated forward and backward. It is good also as a possible control motor, and it is good also as a control motor which can rotate both the 1st motor 11 and the 2nd motor 12 forward and backward. Moreover, the 1st motor 11 and the 2nd motor 12 are good also as a motor with a brush, respectively, and good also as a brushless motor.

  In the above embodiment, the second motor 12 and the second drive lever 29 are configured so that the link mechanism (the second drive crank arm 14, the second drive crank arm 14, The third connecting rod 31 and the second passenger seat side swing lever 28) are connected to each other. However, the present invention is not limited to this, and the connection may be made without using the link mechanism.

In the above embodiment, the first drive lever 26 is rotated within the range below the first axis L1, but is configured to be rotated within the range above the first axis L1. Also good.
In the above embodiment, the length from the first axis L1 to the third axis L3 and the length from the fourth axis L4 to the fifth axis L5 are set to be the same, and the third axis Although the length from L3 to the fourth axis L4 and the length from the first axis L1 to the fifth axis L5 are set to be the same, they may be changed to different lengths.

The technical idea that can be grasped from the above embodiment and other examples will be described below together with the effects thereof.
(A) In the vehicle wiper device according to claim 2, the mechanism reduction ratio of the first drive coupling mechanism is a value obtained by dividing the rotational speed of the first drive source by the rotational speed of the first drive lever. The mechanism reduction ratio of the second drive coupling mechanism is a value obtained by dividing the rotational speed of the first drive source by the rotational speed of the second wiper arm, and the first drive coupling from the lower inversion position. A vehicle wiper device, wherein a mechanism reduction ratio of the mechanism is set to be larger than a mechanism reduction ratio of the second drive coupling mechanism.

  According to this configuration, the mechanism reduction ratio of the first drive coupling mechanism from the lower inversion position is set to be larger than the mechanism reduction ratio of the second drive coupling mechanism. The rotational speed of the two wiper blades can be set to be faster than the rotational speed of the first wiper blade.

  (B) The vehicle wiper device according to claim 3, wherein the rotation shaft of the first drive source is directly connected to the first drive lever, and the rotation shaft of the third drive source is the second wiper arm. A vehicle wiper device directly connected to the vehicle.

  According to this configuration, the rotation shaft of the first drive source is directly connected to the first drive lever, and the rotation shaft of the third drive source is directly connected to the second wiper arm. The connection mechanism and the second drive connection mechanism) are not necessary.

  DESCRIPTION OF SYMBOLS 1 ... Front window (wiping surface) 11, 51 ... 1st motor (1st drive source), 12 ... 2nd motor (2nd drive source), 13 ... It comprises a part of 1st and 2nd drive connection mechanism A first drive crank arm, 16... A driver-side swing lever constituting a part of the first and second drive coupling mechanisms, 17... A second wiper arm, 18. First connecting rod constituting a part of the drive connecting mechanism, 25... First passenger seat side swing lever constituting a part of the first driving connecting mechanism, 26... First driving lever, 27. A second connecting rod, a second driving lever, 32 a first driven lever, 33 an arm head (second driven lever), 35 a first wiper arm, 36 a first wiper blade, 52 ... Third motor (third drive source), L1 ... First shaft , L2 ... second axis, L3 ... third axis, L4 ... fourth axis, L5 ... fifth axis, G1 ... mechanism reduction ratio of the first drive coupling mechanism, G2 ... mechanism reduction ratio of the second drive coupling mechanism.

Claims (4)

A first drive lever that is supported by a base end portion so as to be rotatable about a first axis at a fixed position with respect to the vehicle body and is rotated by a driving force of a first drive source;
A second drive lever that is supported by a base end portion so as to be rotatable about a second axis located at a fixed position with respect to the vehicle body and is rotated by a driving force of a second drive source;
A first driven lever having a proximal end connected to be pivotable about a third axis on the distal end side of the first drive lever;
The base end side is connected to be pivotable about the fourth axis on the tip side of the first driven lever, and the tip side is pivotable about the fifth axis on the tip side of the second drive lever. A coupled second driven lever;
A first wiper arm that is provided so as to operate integrally with the second driven lever, and a first wiper blade for reciprocating wiping between the upside down positions of the wiping surface is connected to the tip;
A second wiper blade for reciprocally wiping between the upside down positions of the wiping surface is provided with a second wiper arm connected to the tip portion, and the rotation speed of the second wiper blade from the lower inversion position is the first wiper arm. A vehicle wiper device set to be faster than a rotational speed of a wiper blade. The vehicle wiper device according to claim 1,
The second wiper arm is rotated by the driving force of the first drive source, and a first drive connection mechanism that drives and connects the first drive source and the first drive lever; the first drive source; The rotational speed of the second wiper blade from the lower inversion position is faster than the rotational speed of the first wiper blade by making the mechanism reduction ratio different from that of the second drive coupling mechanism for drivingly coupling the wiper arm. A vehicle wiper device characterized by being set to be The vehicle wiper device according to claim 1,
The second wiper arm is rotated by a driving force of a third drive source, and the rotation speed of the first drive source and the rotation speed of the third drive source are made different from each other, whereby the second wiper arm from the lower inversion position is changed. 2. A vehicle wiper device, wherein the rotational speed of the two wiper blades is set to be faster than the rotational speed of the first wiper blade. The vehicle wiper device according to any one of claims 1 to 3,
A part of the second wiper blade is disposed on an upper side in a direction along the wiping surface of the first wiper blade in a state where the second wiper blade is in a lower inverted position.

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