JP2008189158A - Wiper device and wiper system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device capable of performing wiper wiping action by one direction rotation of a wiper motor even if the wiper device is brought into a state that a defect occurs in normal/reverse rotation control for reciprocating the wiping action of a wiper, and the wiper motor is brought into a state of one direction rotation from normal/reverse rotation. <P>SOLUTION: The wiper device constituted so that, on a connection part 35 of a crank arm 30 and a drive rod 23, a connection part movable mechanism by a sub-lever 32 or the like is provided, and accompanied by turning in a restriction range or a broader range of the crank arm 30 by the restriction of a stopper 21 for restricting movement exceeding an operation allowance range of pivot levers 20a, 20b (wiper), the sub-lever 32 is turned relative to a crank arm body 31 to make the connection part 35 movable, and rotation motion of the crank arm 30, i.e., one direction rotation of the wiper motor is allowed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wiper device configured using a wiper motor that rotates forward and backward for a reciprocating wiping operation of the wiper, and a wiper system including the wiper device and a control device.

  In the wiper device, a crank arm fixed to the output shaft of the wiper motor is connected to a link mechanism, and the wiper is reciprocated through the link mechanism by the operation of the crank arm based on the wiper motor. In such a wiper device, there is known a device in which a wiper motor is reciprocally rotated by a predetermined angle by rotating a wiper motor forward and backward to perform a reciprocating wiping operation of the wiper.

  However, in such a wiper device, there is a case in which a defect occurs in the control and the wiper motor rotates continuously in one direction without rotating forward and backward. In such a case, the wiper is operated beyond the normal wiping range. End up. Then, there was a problem that the wiper collided with the vehicle body and damaged the vehicle body or the wiper itself.

Therefore, for example, as shown in Patent Document 1, a stopper is provided for restricting the rotation of the crank arm of the wiper motor or the rotation of the swing lever constituting the link mechanism, so that the forward / reverse rotation of the wiper motor becomes impossible. Even if it rotates continuously in one direction, the operating range of the crank arm or the swing lever is restricted by contacting the stopper. Thereby, the wiping range of the wiper is restricted, and the wiper and the vehicle body are prevented from being damaged.
JP-T-2004-509003

  However, in the configuration of the above-described Patent Document 1, although the wiper range of the wiper is restricted by the crank arm or the swing lever coming into contact with the stopper, the driving of the wiper motor is forcibly restricted. For this reason, a circuit breaker provided for preventing motor burnout due to restraint operates, and thereafter, the motor cannot be supplied with power and cannot be driven. As a result, wiping with a wiper becomes impossible, and it becomes difficult to secure driving visibility in rainy weather, and it is necessary to immediately stop driving.

  The present invention has been made to solve the above-described problems, and its purpose is to cause a defect in the forward / reverse inversion control for the reciprocating wiping operation of the wiper, so that the wiper motor changes from forward / reverse rotation to unidirectional rotation. An object of the present invention is to provide a wiper device that can perform a wiper wiping operation by one-way rotation of the wiper motor even in a situation, and a wiper system that includes the wiper device and a control device.

In order to solve the above-mentioned problem, the invention according to claim 1 is a drive in which a crank arm fixed to an output shaft of a wiper motor is reciprocally rotated and coupled to the crank arm by reciprocating rotation of the crank arm. A wiper device that reciprocates a wiper via a transmission mechanism,
The wiper motor is rotated forward and backward so that the crank arm is reciprocally rotated at an angle smaller than 180 °, and the movement of the wiper that is provided with respect to the drive transmission mechanism and exceeds a predetermined allowable operating range is limited. The crank arm pivoting range is indirectly regulated by the regulating means, and the crank arm at a connecting portion between the crank arm and the drive transmission mechanism is equal to or greater than the regulation range defined by the regulating means. The gist of the present invention is that a connecting portion moving mechanism that moves the connecting portion to move the crank arm in accordance with the rotation of the connecting portion is provided.

  In this invention, the connecting portion movable mechanism is provided at the connecting portion between the crank arm and the drive transmission mechanism, and the crank arm is rotated beyond the restriction range by restricting the restricting means for restricting the movement of the wiper beyond the allowable operation range. Along with this, the connecting portion is moved to enable the rotational movement of the crank arm. That is, the crank arm is reciprocally rotated based on the forward / reverse rotation of the wiper motor, and the wiper is reciprocated through the drive transmission mechanism by the reciprocal rotation of the crank arm, but there is a defect in the forward / reverse inversion control of the wiper motor. Therefore, the rotation of the wiper motor is permitted because the crank arm can be rotated while being restricted by the restricting means on the drive transmission mechanism side. Thereby, even if the wiper motor falls into a situation where the forward / reverse rotation is changed to one-way rotation, the wiper wiping operation by the one-way rotation of the wiper motor becomes possible.

  According to a second aspect of the present invention, in the wiper device according to the first aspect, the connecting portion moving mechanism is configured such that the connecting portion moves against an urging force when being restricted by the restricting means, and the connecting portion is moving when not being restricted. The gist of the invention is that it includes a biasing member that biases the portion so as to be held at a predetermined position.

  In this invention, the linking member movable mechanism is provided with an urging member, and the linking member is moved against the urging force when regulated by the regulating means, and is urged so that the linking unit is held at a predetermined position when not regulated. The As a result, during a normal wiping operation that is not restricted by the restricting means, the connecting portion is held at a predetermined position, and rattling between the crank arm and the drive transmission mechanism is eliminated, so that the normal wiping operation is stable. It becomes.

  According to a third aspect of the present invention, in the wiper device according to the first or second aspect, the connecting portion movable mechanism is rotatable to the crank arm main body fixed to the output shaft of the wiper motor, and to the crank arm main body. And the connecting portion for connecting to the drive transmission mechanism is set at a position spaced from the rotation shaft, and the crank arm body rotates with the rotation of the crank arm body beyond the restriction range defined by the restriction means. The gist of the present invention is to include a sub-lever that rotates relative to the arm body.

  In the present invention, the connecting portion movable mechanism includes a crank arm main body fixed to the output shaft of the wiper motor, and a connection that is rotatably supported by the crank arm main body and connected to the drive transmission mechanism at a position separated from the rotating shaft. The sub-lever is set, and the sub-lever rotates relative to the crank arm body with the rotation of the crank arm body that exceeds the restriction range defined by the restriction means. Is acceptable. That is, a simple structure using the connecting portion movable mechanism using the crank arm main body and the sub-lever that rotatably supports the crank arm main body can be achieved.

  According to a fourth aspect of the present invention, in the wiper device according to the third aspect, the connecting portion movable mechanism is configured such that the sub lever rotates against an urging force when regulated by the regulating means, and the sub lever when not regulated. The gist of the invention is that a biasing member for biasing is held between the crank arm main body and the sub lever so as to be held at a predetermined position.

  According to the present invention, the biasing member provided between the crank arm body and the sub-lever allows the sub-lever to rotate against the biasing force when restricted by the restricting means, and the sub-lever is held at a predetermined position when not regulated. Be energized. As a result, during a normal wiping operation that is not restricted by the restricting means, the sub-lever (connecting portion) is held at a predetermined position, and there is no backlash between the crank arm and the drive transmission mechanism. It will be stable.

  According to a fifth aspect of the present invention, in the wiper device according to the fourth aspect, the sub-lever is engaged with the biasing member on the opposite side of the rotation shaft from the connecting portion. The gist.

  In the present invention, the biasing member is locked to the sub-lever on the side opposite to the connecting portion with the drive transmission mechanism across the rotation shaft of the lever. That is, since the load points of the drive transmission mechanism and the urging member are arranged separately on both sides of the rotation axis of the sub lever, the rotation of the sub lever can be stabilized.

  According to a sixth aspect of the present invention, in the wiper device according to any one of the third to fifth aspects, the connecting portion movable mechanism includes guide means for guiding the rotation of the sub lever. The gist.

In the present invention, since the rotation of the sub lever is guided by the guide means, the rotation of the sub lever can be stabilized.
According to a seventh aspect of the present invention, in the wiper device according to any one of the first to sixth aspects, the drive transmission mechanism includes a swing lever fixed to a pivot shaft for supporting the wiper. The gist of the regulating means is a stopper that regulates the swing range of the swing lever so as to limit the allowable operation range of the wiper.

  In the present invention, in order to limit the allowable operation range of the wiper, a stopper is provided for restricting the swing range of the swing lever fixed to the pivot shaft. That is, by restricting the swing range of the swing lever that operates in the same manner as the wiper operation, the allowable operation range of the wiper can be easily and accurately limited.

  According to the eighth aspect of the present invention, the crank arm fixed to the output shaft of the wiper motor is reciprocally rotated, and the wiper is reciprocated via a drive transmission mechanism connected to the crank arm by the reciprocating rotation of the crank arm. A wiper device that performs a wiping operation, a wiper control device that includes a drive circuit that supplies power to rotate the wiper motor forward and backward, and a control circuit that performs forward and reverse control of the wiper motor via the drive circuit. It is a wiper system, Comprising: The said wiper apparatus is comprised by the wiper apparatus of any one of Claims 1-7, The said wiper control apparatus bypasses the said drive circuit, and is directly to the said wiper motor. The gist of the invention is that it includes power supply switching means for switching to power supply for unidirectional rotation.

  According to the present invention, in the wiper device, the connecting portion movable mechanism is provided in the connecting portion between the crank arm and the drive transmission mechanism, so that the crank arm can be rotated beyond the restriction range by the restriction of the restriction means for restricting the allowable operation range of the wiper. Along with this, the connecting portion is moved to enable the rotational movement of the crank arm. The wiper control device further includes power supply switching means that bypasses the drive circuit controlled by the control circuit that performs forward / reverse inversion control and switches the power supply to the wiper motor to supply power for one-way rotation. That is, the crank arm is reciprocally rotated based on the forward / reverse rotation of the wiper motor, and the wiper is reciprocated through the drive transmission mechanism by the reciprocal rotation of the crank arm. When the wiper motor is rotated in one direction by the power supply switching means, the rotation of the wiper motor is allowed because the crank arm can be rotated while being restricted by the restricting means on the drive transmission mechanism side. Thereby, even if the wiper motor falls into a situation where the forward / reverse rotation is changed to one-way rotation, the wiper wiping operation by the one-way rotation of the wiper motor becomes possible.

  Therefore, according to the above-described invention, even if a defect occurs in the forward / reverse rotation control for the reciprocating wiping operation of the wiper and the wiper motor falls into a state where the forward / reverse rotation is changed to one-way rotation, the wiper motor is rotated in one direction. Thus, it is possible to provide a wiper device that can perform a wiper wiping operation, and a wiper system that includes the wiper device and a control device.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
1 and 2 show a wiper device 10 according to the present embodiment. The wiper device 10 is configured by integrally assembling a wiper drive mechanism 11 and a wiper motor 12, and the wiper control device 13 shown in FIG. 8 that controls the wiper motor 12 constitutes a wiper system.

  The wiper drive mechanism 11 includes pivot holders 16a and 16b that rotatably support a pair of pivot shafts 15a and 15b. The pivot holders 16a and 16b are fixed to and integrated with a frame 17. A motor fixing portion 18 is provided substantially at the center of the frame 17, and attachment portions 19 a to 19 c for attaching the wiper device 10 to the vehicle body are located near the pivot holders 16 a and 16 b and the motor fixing portion 18. Is provided. The wiper motor 12 is fixed to the motor fixing portion 18.

  A wiper (not shown) for wiping the wiping surface is fixed to the distal end portion of each pivot shaft 15a, 15b, and the proximal end portion of the swing lever 20a, 20b is respectively attached to the proximal end portion of each pivot shaft 15a, 15b. Are provided so as to rotate integrally. As shown in FIGS. 3 and 4, each swing lever 20a, 20b is within a range slightly exceeding the normal swing range A1 by a stopper 21 provided in a pair with the frame 17 (to prevent damage to the wiper and the vehicle body). For the operation allowable range). In other words, the swing levers 20a and 20b do not come into contact with the stopper 21 during the swing operation within the normal swing range A1. In FIG. 4, a gap between the swing levers 20a and 20b and the stopper 21 is omitted.

  As shown in FIGS. 1 and 2, the tip portions of the swing levers 20 a and 20 b are connected to each other by a link rod 22. In addition, one end of the drive rod 23 is connected to the tip of the one swing lever 20 a along with the link rod 22. The other end of the drive rod 23 is connected to a crank arm 30 fixed to the output shaft 25 of the wiper motor 12 so as to be integrally rotatable. The drive rod 23, the link rod 22, the swing levers 20a and 20b, and the pivot shafts 15a and 15b constitute a drive transmission mechanism. The wiper motor 12 includes a motor unit 26 and a speed reducing unit 27 that decelerates the rotation of the motor unit 26, and a crank arm 30 is connected to an output shaft 25 provided in the speed reducing unit 27.

  As shown in FIG. 3, the crank arm 30 includes a crank arm main body 31, a sub lever 32, and an urging spring 33. The crank arm body 31 is made of a metal plate, and has a substantially central portion fixed to the output shaft 25 of the wiper motor 12. The first extending portion 31a extending from the fixed portion to one side is substantially opposite to the first extending portion 31a. And a second extending portion 31b extending in the direction.

  A sub lever 32 made of a metal plate is rotatably connected to the tip end portion of the first extending portion 31 a by a connecting pin 34. The sub-lever 32 is connected to the other end of the drive rod 23 on one side of the connecting portion by the connecting pin 34. On the other hand, a locking portion 32a for locking the coiled biasing spring 33 is provided at the tip of the other side of the connecting portion of the sub lever 32 by the connecting pin 34. One end of the urging spring 33 is locked to the locking portion 32 a, and the other end is locked to a locking portion 31 c provided at the tip of the second extension portion 31 b of the crank arm body 31. The biasing spring 33 biases the connecting portion 35 of the sub lever 32 with the drive rod 23 in a direction away from the rotation center O of the crank arm 30 (the axis center of the output shaft 25) by its own pulling force.

  The connecting portion 35 between the sub lever 32 and the drive rod 23 is provided with a protruding portion 35a that protrudes toward the crank arm main body 31. The protruding portion 35a rotates the locus of the sub lever 32 provided on the crank arm main body 31. Is inserted into an arcuate guide hole 31d. By inserting the protruding portion 35a into the guide hole 31d, the rotation of the sub lever 32 is guided and the rotation range is restricted. The sub-lever 32 is in a normal position where the connecting portion 35 with the drive rod 23 abuts on the end of the guide hole 31d on the side away from the rotation center O of the crank arm 30 by the biasing force of the biasing spring 33. Is retained.

  As shown in FIG. 4, when the swing lever 20a (, 20b) swings within the normal swing range A1 where it does not come into contact with the stopper 21, the crank arm 30 has the sub lever 32 disposed at the normal position. The reciprocating rotation at a predetermined angle, that is, the revolving rotation within the normal reciprocating rotation range B <b> 1 is performed while the maintained state is maintained. The normal reciprocating rotation range B1 of the present embodiment is set to, for example, 150 °, which is smaller than 180 ° and smaller than 180 ° on both sides in the rotational direction. In other words, the reciprocating rotation of the crank arm 30 in the normal reciprocating rotation range B1 based on the forward / reverse rotation of the wiper motor 12 under the control of the wiper control device 13 causes the swing lever 20a, 20b is reciprocally swung within the normal swinging range A1, and the wiper reciprocally wipes the wiping surface by reciprocating rotation of the pivot shafts 15a and 15b.

  As shown in FIG. 5, when the crank arm 30 rotates so as to exceed the normal reciprocating rotation range B1, the swing lever 20a (, 20b) exceeds the normal swing range A1 and contacts the stopper 21. Touch. At this time, the sub-lever 32 rotates from the normal position against the urging force of the urging spring 33 from the time when the swing lever 20a (, 20b) contacts the stopper 21, and the connecting portion 35 with the drive rod 23 moves. The crank arm 30 is retracted to the rotation center O side. Thereby, the rotation of the crank arm 30 is permitted so that the swing levers 20a and 20b exceed the rotation position of the crank arm 30 within the maximum swing range A0. That is, when a defect occurs in the control of the wiper control device 13 and the wiper motor 12 is rotated in one direction from the forward / reverse rotation, the crank arm 30 is also rotated in one direction. In this case, although the swing lever 20a (, 20b) exceeds the normal swing range A1 and abuts against the stopper 21 and further swing of the swing lever 20a (, 20b) is restricted, the swing lever 20a ( , 20b) with the retracting operation of the sub-lever 32 caused by contacting the stopper 21, the rotational movement of the crank arm 30 is allowed and the rotation of the wiper motor 12 can be continued.

  As shown in FIGS. 5 to 7, when the crank arm 30 makes one rotation, two areas that do not come into contact with the stopper 21 appear, and one of the ranges is the forward movement of the swinging operation of the swinging lever 20 a (, 20 b). (The backward movement range C1), and the other range is the backward movement side of the rocking lever 20a (20b) (reverse movement range C2). That is, with one rotation of the crank arm 30, the swing lever 20a (20b) reciprocates once. Further, between the forward movement range C1 and the backward movement range C2 in one rotation of the crank arm 30, the stopper contact range D1, in which the swing levers 20a and 20b are controlled to swing by contacting the stopper 21. D2. Although the wiper performs a reciprocating wiping operation by the operation of the swing lever 20a (20b), the wiping operation is temporarily performed while the crank arm 30 passes through the stopper contact ranges D1 and D2 at the wiping reversal position. Stop. Thereby, even when the wiper motor 12 rotates in one direction due to a failure of the wiper control device 13, the wiper wiping operation can be continued. The wiper wiping operation is temporarily stopped at the wiping reversal position, and the swing lever 20a (20b) abuts against the stopper 21, so that the driver or the like can be notified that the wiping operation is not normal. .

  As shown in FIG. 8, the wiper control device 13 includes a drive circuit 50, a control circuit (ECU) 51, two relays 52 and 53, and a wiper switch 54, for the wiper device 10 having such a configuration.

  The drive circuit 50 is configured by an H-bridge circuit using four transistors Q1 to Q4. By turning on both the high-side first transistor Q1 and the low-side second transistor Q4, the wiper motor 12 is positively connected. A power source for the reverse drive is supplied from the battery BT, and both the high-side second transistor Q2 and the low-side first transistor Q3 are turned on to supply the wiper motor 12 with a power source for the reverse drive from the battery BT. These transistors Q1 to Q4 are ON / OFF controlled by control signals φ1 to φ4 output from the control circuit 51.

  The control circuit 51 is connected to a wiper switch 54 provided in the driver's seat, and receives an H level ON signal from the battery BT based on an ON operation of the wiper switch 54. The control circuit 51 alternately turns on and off the transistors Q1 and Q4 and the transistors Q2 and Q3 based on the ON signal from the wiper switch 54 to rotate the wiper motor 12 forward and backward, thereby moving the swing levers 20a and 20b to the normal swing range A1. The output shaft 25 of the motor 12 is reciprocated by a predetermined angle so as to be swung. When the drive of the wiper motor 12 is stopped, the control circuit 51 turns on both the low-side transistors Q3 and Q4 for a predetermined time to perform brake control of the motor 12. Based on such forward / reverse reversal control of the wiper motor 12, the reciprocating wiping operation of the wiper by the normal swing range A1 is performed.

  The control circuit 51 is connected to the coil portion 52a of the first relay 52 and the coil portion 53a of the second relay 53, and is grounded via the coil portions 52a and 53a. One power supply terminal of the wiper motor 12 is connected to the battery BT via the switch part 52 b and the wiper switch 54 of the first relay 52, and the other power supply terminal is the switch part 53 b of the second relay 53. Is grounded. Normally, the exciting current is supplied from the control circuit 51 to the coil portions 52a and 53a of the relays 52 and 53, and the off states of the switch portions 52b and 53b are maintained.

  On the other hand, when a failure occurs in the control circuit 51, the fact that the excitation current cannot be output to the relays 52 and 53 and the supply of the excitation current to the coil portions 52a and 53a is cut off. The switch parts 52b and 53b are switched to the on state. By the operation of each of the relays 52 and 53, the wiper motor 12 forms a power supply switching circuit that bypasses the drive circuit 50 and passes only the wiper switch 54, and rotates in one direction based on the ON operation of the wiper switch 54. Drive power is directly supplied. Accordingly, when the wiper switch 54 is turned on in such a situation, the wiper motor 12 continuously rotates in one direction. By rotating the wiper motor 12 in one direction, a wiper wiping operation based on the swing of the swing levers 20a and 20b regulated by the stopper 21 as described above can be performed.

Next, characteristic actions and effects of the present embodiment will be described.
(1) The wiper device 10 of the present embodiment is provided with a connecting portion movable mechanism such as a sub lever 32 at a connecting portion 35 between the crank arm 30 and the drive rod 23 of the drive transmission mechanism, and the swing levers 20a and 20b. The sub-lever 32 rotates with respect to the crank arm body 31 as the crank arm 30 is rotated beyond the control range of the crank arm 30 by restricting the stopper 21 to limit the swing exceeding the allowable operation range of the (wiper). The connecting portion 35 is movable) so that the crank arm 30 can rotate. Further, the wiper control device 13 includes relays 52 and 53 that bypass the drive circuit 50 controlled by the control circuit 51 that performs forward / reverse inversion control and directly switch the wiper motor 12 to supply power for one-way rotation. Is provided. That is, the crank arm 30 is reciprocated based on the forward / reverse rotation of the wiper motor 12, and the wiper is reciprocated through the drive rod 23 or the like by the reciprocal rotation of the crank arm 30. When the wiper motor 12 is rotated in one direction by the switching operation of the relays 52 and 53 due to a defect in the forward / reverse reversal control of the rotation 12, the rotational movement of the crank arm 30 while the swing levers 20a and 20b are restricted by the stopper 21 Therefore, the rotation of the wiper motor 12 is allowed. Thereby, even if the wiper motor 12 falls into a state where the forward / reverse rotation is changed to one-way rotation, the wiper wiping operation by the one-way rotation of the wiper motor 12 can be performed. For this reason, for example, it is possible to secure driving visibility in rainy weather, and there is no need to immediately stop driving.

  (2) In the present embodiment, the urging spring 33 mounted between the crank arm body 31 and the sub lever 32 is used to resist the urging force when the swing levers 20a and 20b are regulated by the stopper 21. The sub-lever 32 is urged so as to be held at the normal position when it is not regulated. As a result, during the normal wiping operation not subject to the restriction of the stopper 21, the sub lever 32 is held in the normal position and the rattling between the crank arm 30 and the drive rod 23 is eliminated, so that the normal wiping operation is stabilized. Can be.

  (3) In the present embodiment, the crank arm main body 31 fixed to the output shaft 25 of the wiper motor 12, and a position that is rotatably supported by the crank arm main body 31 by the connecting pin 34 and separated from the rotation shaft. The connecting portion moving mechanism is configured using the sub lever 32 in which the connecting portion 35 connected to the drive rod 23 is set. That is, a simple structure using the connecting portion movable mechanism using the crank arm main body 31 and the sub lever 32 rotatably supported by the crank arm main body 31 can be achieved.

  (4) In the present embodiment, the urging spring 33 is engaged with the connecting portion 35 of the sub lever 32 with the drive rod 23 on the opposite side of the connecting pin 34. That is, since the load points of the drive rod 23 and the biasing spring 33 are arranged separately on both sides of the rotation shaft (the connecting pin 34) of the sub lever 32, the rotation of the sub lever 32 can be stabilized.

  (5) In the present embodiment, since the rotation of the sub lever 32 is guided by the guide hole 31d provided in the crank arm body 31, the rotation of the sub lever 32 can be stabilized also by this.

  (6) In the present embodiment, in order to limit the allowable operation range of the wiper, the stopper 21 is provided that restricts the swing range of the swing levers 20a and 20b fixed to the pivot shafts 15a and 15b. That is, by restricting the swing range of the swing levers 20a and 20b that operate in the same manner as the operation of the wiper, the allowable operation range of the wiper can be easily and accurately limited.

The embodiment of the present invention may be modified as follows.
In the above embodiment, the sub-lever 32 rotates with respect to the crank arm body 31 as the crank arm 30 rotates beyond the restriction range defined by the stopper 21 (the connecting portion 35 with the drive rod 23 moves). ), The rotational movement of the crank arm 30 is allowed. However, the connecting portion movable mechanism may be configured to set the connecting portion 35 to the drive rod 23 on a member that slides with respect to the crank arm main body 31, for example. . Even in this case, it is desirable to use a biasing member that acts in the same manner as the above-described embodiment with respect to the sliding member.

  In the above embodiment, the coiled biasing spring 33 is used as the biasing member that holds the sub-lever 32 in the normal position. However, the present invention is not limited thereto, and for example, a torsion coil spring or the like may be used. Further, although the biasing spring 33 is locked on the side opposite to the connecting portion 35 of the sub lever 32 with the driving rod 23 with the connecting pin 34 interposed therebetween, the biasing spring 33 is engaged with the sub lever 32 on the side of the connecting portion 35 with the driving rod 23. It may be stopped.

  In the above embodiment, the rotation of the sub lever 32 is guided by inserting the protruding portion 35a into the guide hole 31d provided in the crank arm body 31, but the means for guiding the sub lever 32 is not limited to this. It may be omitted.

  In the above embodiment, the swing range of the swing levers 20a and 20b is restricted by the stopper 21 in order to limit the allowable operation range of the wiper. However, for example, a pivot of a drive transmission mechanism other than the swing levers 20a and 20b The operation of the shafts 15a and 15b, the link rod 22, and the drive rod 23 may be restricted.

  In the above embodiment, the fact that the excitation current cannot be output to the relays 52 and 53 due to the failure of the control circuit 51 is used, and the wiper motor 12 is directly rotated in one direction using the relays 52 and 53. However, the power supply switching circuit is not limited to this configuration.

  For example, as shown in FIG. 9, a push switch 55 that can be operated by a driver or the like is used, and inside the push switch 55, a pair of switch portions 55a and 55b that are both turned on by the push operation are provided. Then, one power supply terminal of the wiper motor 12 is connected to the battery BT via the switch part 55a, and the other power supply terminal is grounded via the switch part 55b. As a result, when a failure occurs in the control circuit 51 (such as when the wiper motor 12 does not operate even when the wiper switch 54 is turned on), the pressure switch 55 is pressed to directly rotate the wiper motor 12 in one direction. Power for is supplied. In this way, the power supply switching circuit may be configured.

It is a top view of the wiper device in this embodiment. It is a bottom view of a wiper device. It is an enlarged view of a crank arm part. It is a schematic diagram for demonstrating operation | movement of a crank arm. It is a schematic diagram for demonstrating operation | movement of a crank arm. It is a schematic diagram for demonstrating operation | movement of a crank arm. It is a schematic diagram for demonstrating operation | movement of a crank arm. It is a circuit diagram which shows a wiper control apparatus. It is a circuit diagram which shows the wiper control apparatus in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Wiper motor, 13 ... Wiper control apparatus, 15a, 15b ... Pivot shaft, 20a, 20b ... Swing lever which comprises a drive transmission mechanism, 21 ... Stopper as a control means, 22 ... Drive transmission mechanism Link rod constituting 23, drive rod constituting drive transmission mechanism, 25 ... output shaft, 30 ... crank arm, 31 ... crank arm main body constituting connecting portion moving mechanism, 31d ... guide hole constituting guide means, 32 ... Sub-lever constituting the connecting part movable mechanism, 33 ... Burning spring as an urging member constituting the connecting part movable mechanism, 34 ... Connecting pin constituting the rotating shaft, 35 ... Connecting part, 35a ... Guide means. , A drive circuit, 51, a control circuit, 52, 53, a relay constituting power supply switching means, 55, a power supply switching means. Pressing switch to.

Claims (8)

A wiper device that reciprocally rotates a crank arm fixed to an output shaft of a wiper motor, and reciprocally wipes the wiper via a drive transmission mechanism coupled to the crank arm by reciprocating rotation of the crank arm,
The wiper motor is rotated forward and backward so that the crank arm is reciprocally rotated at an angle smaller than 180 °, and the movement of the wiper that is provided with respect to the drive transmission mechanism and exceeds a predetermined allowable operating range is limited. The rotation range of the crank arm is indirectly restricted by the restriction means that
In the connecting portion between the crank arm and the drive transmission mechanism, the connecting portion is movable in accordance with the rotation of the crank arm beyond the restriction range defined by the restricting means, and the crank arm can be rotated. A wiper device comprising a movable part mechanism. The wiper device according to claim 1,
The connecting portion movable mechanism is
A wiper comprising: an urging member that urges the connecting portion to move against an urging force when regulated by the regulating means, and urges the coupling portion to be held at a predetermined position when not regulated. apparatus. The wiper device according to claim 1 or 2,
The connecting portion movable mechanism is
A crank arm body fixed to the output shaft of the wiper motor;
The connecting portion that is rotatably supported by the crank arm main body and is connected to the drive transmission mechanism at a position separated from the rotating shaft is set, and the crank arm main body that exceeds the restriction range by the restriction means. And a sub-lever that rotates with respect to the crank arm main body according to the rotation of the wiper device. The wiper device according to claim 3.
The connecting portion movable mechanism is
A biasing member that biases the sub-lever to rotate against the biasing force when regulated by the regulating means and holds the sub-lever at a predetermined position when not regulated is provided between the crank arm body and the sub-lever. A wiper device characterized in that it is provided in between. The wiper device according to claim 4, wherein
The wiper device, wherein the sub-lever is engaged with the urging member on a side opposite to the connecting portion across the rotation shaft. In the wiper device according to any one of claims 3 to 5,
The wiper device, wherein the connecting portion movable mechanism includes guide means for guiding the rotation of the sub lever. The wiper device according to any one of claims 1 to 6,
The drive transmission mechanism includes a swing lever fixed to a pivot shaft for supporting the wiper,
The wiper device according to claim 1, wherein the restricting means is a stopper for restricting a swing range of the swing lever so as to limit an allowable operation range of the wiper. A wiper device that reciprocates a crank arm fixed to the output shaft of the wiper motor, and reciprocally wipes the wiper via a drive transmission mechanism coupled to the crank arm by reciprocating rotation of the crank arm;
A wiper system comprising a wiper control device having a drive circuit that supplies power for rotating the wiper motor forward and reverse and a control circuit that performs forward and reverse control of the wiper motor via the drive circuit,
The wiper device is configured by the wiper device according to any one of claims 1 to 7,
The wiper control device includes a power supply switching unit that bypasses the drive circuit and directly switches to the power supply for one-way rotation to the wiper motor.

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