JP2008285078A - Wiper motor and wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire motor capable of properly executing a next wiping action even when a load in an outward direction in an acting range is applied to the wiper. <P>SOLUTION: A link mechanism 12 provided to a wire motor 10 is constituted with a both-lever mechanism with a crank 20 on a motor part 11 side and a lever 22 on an output shaft 10a side with a rod 21. A stop and downward-reversion position of a wiper is set to a first position, where a crank 20 and the rod 21 are aligned on one straight line, and an upward-reversion position of the wiper is set to a position before a second position, where the crank rod 20 and the rod 21 are aligned on one straight line opposite to the first position, and immediately before a position, where the lever 22 is connected with the rod 21 on a straight line L2. A motor part 11 is normally and reversely driven between the stop and downward-reversion position and the upward-reversion position of the wiper thus set. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a wiper motor configured by integrally assembling a motor unit that is driven forward and backward and a link mechanism that is drivingly connected to the motor unit, and a wiper control circuit that controls the wiper motor and the motor. The present invention relates to a wiper device.

  2. Description of the Related Art Conventionally, there is a vehicle wiper device that uses a wiper motor that performs forward / reverse drive and reciprocally swings the wiper based on forward / reverse drive of the motor. In such a vehicle wiper device, when the wiper motor is configured to reciprocally swing the wiper directly, the wiper swing both ends (stop / lower reverse position and There is a problem that the position accuracy of the upper reversal position) is deteriorated and the torque is insufficient near the swing end.

Therefore, for example, as disclosed in Patent Document 1, a motor unit that is driven forward and backward and a link mechanism that is drivingly connected to the motor unit are integrally assembled, and the wiper reciprocally swings based on the output. A wiper motor has been proposed. In this wiper motor, the position accuracy at both ends of the swing is improved and the torque near the swing end is improved due to the characteristics of the link mechanism that is low speed and high torque near the swing end of the wiper, and the output characteristics of the motor section are complemented. It is supposed to do.
Japanese Patent Laid-Open No. 11-34805

  By the way, in the wiper motor of patent document 1, in the link mechanism which mutually connects an output shaft, the lever fixed, and the crank which transmits the driving force by the side of a motor part with a rod, the crank and a rod become 2 in a straight line. The positions are set to a stop / lower inversion position and an upper inversion position, respectively, at both ends of the wiper's swing.

  Therefore, for example, if the wiper is operated until the lever and rod are aligned in a straight line from the upper reversal position to the outside of the upper working range due to traveling wind, etc., the wiper is reversed toward the lower reversal position. Therefore, even if the motor unit is driven in reverse, the lever operates in the reverse direction, and so-called buckling occurs, in which the wiper operates further upward. Thus, when a load is applied to the wiper in the direction outside the operation range, there is a possibility that normal operation of the next wiper cannot be guaranteed.

  The present invention has been made to solve the above-described problem, and the object thereof is to appropriately execute the next wiper wiping operation even when a load is applied to the wiper in the direction outside the operation range. A wiper motor and a wiper device are provided.

  In order to solve the above-mentioned problem, the invention according to claim 1 is configured by integrally assembling a motor part that is driven forward and backward and a link mechanism that is drivingly connected to the motor part, and the wiper is fixed. A wiper motor having an output shaft in its link mechanism, wherein the link mechanism is configured such that a crank that reciprocally swings by driving of the motor unit and a lever to which the output shaft is fixed are rotatable via a rod. It is composed of a double lever mechanism that reciprocates and rotates the output shaft within a range of less than ½ rotation, and the stop position or the lower reverse position of the wiper is set to the first position where the crank and the rod are aligned in a straight line. The lever and the rod are aligned in a straight line prior to the second position where the crank and the rod are aligned on the opposite side of the first position. It is set before the position, the motor unit, as its gist to be forward and reverse driven between the stop position or the lower reversing position and the upper reversing position of the wiper.

  In this invention, the link mechanism provided in the wiper motor is composed of a double lever mechanism in which the crank on the motor unit side and the lever on the output shaft side are connected by a rod and the output shaft reciprocates within a range of less than 1/2 rotation. The wiper stop position or the lower reversal position is set to the first position where the crank and the rod are aligned on a straight line, and the upper reversal position of the wiper is the first position where the crank and the rod are aligned on the opposite side of the first position. Prior to the second position, the position is set to a position immediately before the lever and the rod are aligned. The motor unit is driven forward / reversely between the wiper stop position or the lower reverse position and the upper reverse position set in this way. That is, in such a link mechanism, when the lever and the rod that drive the output shaft (wiper) are aligned in a straight line at the upper reversal position, the buckling (the lever moves out of the operating range due to external force) (Phenomenon in which the lever operates in the reverse direction due to swinging) may occur, but the occurrence of buckling can be prevented beforehand by driving the motor portion in reverse at the position immediately before that.

  According to a second aspect of the present invention, in the wiper motor according to the first aspect, the link mechanism has a shorter length between the connecting points at both ends of the rod than an inter-axis pitch between the rotation shaft of the crank and the output shaft. The gist is that it is configured.

  In this invention, the link mechanism is composed of a double lever mechanism in which the length between the connecting points on both ends of the rod is shorter than the pitch between the rotation axis of the crank and the output shaft, and the occurrence of buckling that can occur in this link mechanism is generated. It is possible to reduce the size of the wiper motor while preventing it.

  According to a third aspect of the present invention, in the wiper motor according to the first or second aspect, the link mechanism is accommodated in a housing member, and the housing member includes the lever and the lever at the upper inverted position of the wiper. The lever is further moved outward between the position immediately before the rod is aligned on a straight line and the position where the lever and the rod are aligned on a straight line, and the position where the rod is positioned outside the upper reversal position. The gist is to have a stopper that abuts at least one of the crank, the rod, and the lever in order to regulate.

  In the present invention, the housing member includes a crank, a rod, and a lever between a position immediately before the lever and the rod at the upper reversing position are aligned in a straight line and a position at which the lever and the rod are aligned outside the upper reversing position. At least one is abutted, and further outward movement of the lever is restricted. In other words, the stopper does not interfere with the link mechanism members even when it reaches the upper reversal position during a normal wiper wiping operation, and the lever moves further outward from the upper reversal position so that the lever and rod are in a straight line. Before they are aligned, they abut against the members of the link mechanism, and the further outward movement of the lever is mechanically restricted. This reliably prevents buckling that may occur when the lever and the rod are aligned.

  According to a fourth aspect of the present invention, in the wiper motor according to any one of the first to third aspects, the link mechanism is configured to mesh with a worm provided integrally with a rotating shaft of the motor unit and to drive the driving force of the motor unit. The gist of the present invention is that it has a reduction gear that transmits to the motor, and the reduction gear is formed in a fan shape corresponding to forward and reverse rotation of the motor unit.

  In this invention, the reduction gear interposed between the motor unit and the link mechanism is formed in a fan shape corresponding to the forward and reverse rotation of the motor unit, that is, unnecessary portions of the reduction gear are omitted. Can contribute.

  According to a fifth aspect of the present invention, in the wiper motor according to any one of the first to third aspects, the link mechanism is configured to mesh with a worm provided integrally with a rotating shaft of the motor unit and to drive the driving force of the motor unit. The gist of the invention is that it has a reduction gear that transmits to the output shaft, and the reduction gear is arranged coaxially with the output shaft so as to be relatively rotatable.

  In this invention, since the reduction gear interposed between the motor unit and the link mechanism is arranged coaxially with the output shaft, it is possible to secure a space for arranging the output shaft inside the reduction gear, thereby reducing the size of the wiper motor. Can contribute.

  According to a sixth aspect of the present invention, there is provided a wiper motor comprising a motor unit and a link mechanism that is drivingly connected to the motor unit, and an output shaft on which the wiper is fixed. A wiper device comprising: a wiper control circuit that drives the motor unit forward and backward, transmits the driving force to the output shaft via the link mechanism, and reciprocally swings the wiper, A crank that reciprocally swings when the motor unit is driven and a lever to which the output shaft is fixed are rotatably connected via a rod, and the output shaft is reciprocally rotated within a range of less than 1/2 rotation. The wiper control circuit includes a first position where the crank and the rod are aligned on a straight line, and sets the wiper stop position or the lower reverse position, and the clamp And a position immediately before the lever and the rod are aligned on a straight line prior to a second position where the rod and the rod are aligned on the opposite side of the first position is defined as the upper reversal position of the wiper. The gist of the present invention is to perform forward / reverse control between the wiper stop position or the lower inversion position and the upper inversion position.

  According to the present invention, it is possible to provide a wiper device that obtains the same effects as those of the first aspect.

  According to the present invention, it is possible to provide a wiper motor and a wiper device that can appropriately execute the next wiper wiping operation even when a load in the direction outside the operation range is applied to the wiper.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a wiper device of this embodiment. A pair of wipers 2 for wiping rain water or the like on the glass surface 1a of the vehicle windshield 1 is connected to a wiper arm 2a and a tip of the wiper arm 2a so as to follow the curved shape of the glass surface 1a. And a wiper blade 2b. The base end portion of each wiper arm 2a is fixed to the output shaft 10a of the wiper motor 10 prepared for each, and each wiper 2 wipes the glass surface 1a based on the reciprocating rotation of the output shaft 10a of each wiper motor 10 controlled in synchronization. To do.

  As shown in FIGS. 2 to 4, the wiper motor 10 is configured by integrally assembling a motor unit 11 and a link mechanism 12 that is drivingly connected to the motor unit 11. The motor unit 11 is configured by a DC motor having a power supply brush (not shown), and the rotating shaft 13 is driven forward and backward based on control by the wiper control circuit X. A worm 13a is integrally formed on the rotary shaft 13, and a reduction gear 14 having a worm wheel as a fan shape is engaged with the worm 13a. The reduction gear 14 and the worm 13a of the rotary shaft 13 constitute a reduction mechanism. The reduction gear 14 is accommodated in the gear accommodating portion 15a of the motor housing 15 of the wiper motor 10, and a cover 16 is attached to the opening of the gear accommodating portion 15a.

  The reduction gear 14 has a cylindrical shaft portion 14a and a gear portion 14b extending in a fan shape in a range of about 120 ° radially outward from the shaft portion 14a and having teeth formed on the outer peripheral surface thereof. The portion 14b and the worm 13a of the rotating shaft 13 are engaged with each other. A support shaft 17 is fitted into the shaft portion 14 a of the reduction gear 14. The reduction gear 14 has a support shaft 17 inserted through a bearing 18 provided in the motor housing 15 and is rotatably supported, and a distal end portion of the support shaft 17 is provided on a side opposite to the gear storage portion 15a. Is protruding.

  The link mechanism 12 is accommodated in the link accommodating portion 15 b and includes a crank 20, a rod 21, and a lever 22. The crank 20 is connected at its base end to the tip of the support shaft 17 of the reduction gear 14 so as to rotate integrally with the connection pin 23, and the driving force from the motor unit 11 is transmitted via the reduction gear 14. . The tip of the crank 20 is rotatably connected to one end of the rod 21 by a connecting pin 24, and the other end of the rod 21 is rotatably connected to the tip of the lever 22 by a connecting pin 25. The output shaft 10 a is fixed to the base end portion of the lever 22. At this time, the lever 22 is fixed to a substantially central portion in the axial direction of the output shaft 10a, and the base end portion of the output shaft 10a is inserted into a bearing 26 provided in the motor housing 15 and is rotatably supported. . The distal end portion of the output shaft 10a protrudes outside from a cover 19 attached to the opening of the link housing portion 15b, and the wiper arm 2a of the wiper 2 is fixed.

  Here, in the link mechanism 12 of the present embodiment, the crank 20 is formed slightly shorter than the lever 22 and the rod 21 is formed to be about half the length of the crank 20, and the output shaft 10a is rotated less than 1/2 turn. It is composed of a double lever mechanism that reciprocates in the range. That is, the length a from the rotation center of the crank 20 to the connection point with the rod 21, the length b between the connection points at both ends of the rod 21, the length c from the rotation center of the lever 22 to the connection point with the rod 21, and Assuming that the shaft pitch d between the rotation shaft of the crank 20 (support shaft 17) and the rotation shaft of the lever 22 (output shaft 10a) is d, the length a of the crank 20 is slightly shorter than the length c of the lever 22, and each of these lengths. The inter-axis pitch d is set shorter than the lengths a and c, and the length b of the rod 21 is set to be the shortest. Thereby, in this embodiment, the rotation angle of the lever 22 is set to about 90 °, and the rotation angle of the crank 20 is set to about 110 °.

  Also, based on this, the reduction gear 14 that rotates integrally with the crank 20 is formed in a fan shape in the range of about 120 ° without any problem in meshing as described above. Further, in the present embodiment, by using the fan-shaped reduction gear 14, the output shaft 10a fixed to the lever 22 is in a range (outside the rotation range) that does not contact the operating reduction gear 14 when viewed from the axial direction. And it arrange | positions so that the whole whole may be accommodated in the outer periphery circle of the reduction gear 14, and space saving is achieved. Incidentally, the output shaft 10a is disposed at a position close to the reduction gear 14 when a lever 22 shown in FIG. 2 described later is disposed at a swinging end position (when the wiper 2 is positioned at the stop / lower reverse position P1). ing.

  In the link mechanism 12, as shown in FIG. 2, the crank 20 and the rod 21 are arranged on a straight line L1, and the position of the lever 22 where the crank 20, the rod 21 and the lever 22 form a triangle is the swing end position ( In this embodiment, the one end position of the swing is set to the stop / lower reverse position P1 of the wiper 2 (see FIG. 1). In other words, in a state where the crank 20 and the rod 21 are aligned on the straight line L1, rotation from the lever 22 (output shaft 10a) is mechanically restricted by the attitude of the link mechanism 12 even when an external force is input. The state of 20 and the rod 21 is set to the stop / lower inversion position P1 of the wiper 2 where the wiper 2 is heavily loaded. Further, since the movement of the lever 22 is mechanically restricted, the wiper 2 can be properly wiped when the wiper motor 10 is driven after the stop / lower reverse position P1 of the wiper 2 is maintained at an appropriate position. It is executable.

  On the other hand, prior to the second position where the crank 20 and the rod 21 are aligned on the opposite side of the first position (the position where the crank 20 and the rod 21 are aligned and aligned with each other), the lever 22 The rod 21 is aligned on the straight line L2, and the crank 20, the rod 21 and the lever 22 form a triangle, and the position of the lever 22 is the other end position of the swing. In this embodiment, the lever 22 and the rod 21 are A predetermined position (predetermined position where the connecting point O1 of the lever 22 and the rod 21 is inside the straight line L2) shown in FIG. 3 immediately before the position aligned on the straight line L2 is set as the upper reversal position P2 of the wiper 2 (see FIG. 3). 1). Thus, for example, when the configuration of the present embodiment is not employed, an external force is input from the lever 22 (output shaft 10a) side at the upper reversal position P2, and the posture of the lever 22 and the rod 21 rotates outward beyond the straight line L2. If it moves, even if the motor unit 11 is rotated in the reverse direction and the crank 20 is swung in the reverse direction, the lever 22 has a buckling that rotates more and more outward as can be seen from the posture of the link mechanism 12. Will occur. However, since the postures of the lever 22 and the rod 21 at the upper reversal position P2 are set as described above as in the present embodiment, the motor unit 11 is then reversed to swing the crank 20 in the reverse direction. By doing so, the lever 22 can also be reliably swung in the reverse direction from the upper inversion position P2.

  Then, the wiper control circuit X of the present embodiment performs stop or reverse control of the motor unit 11 with the one end position of the lever 22 shown in FIG. 2 as the stop / lower reverse position P1, and controls the lever 22 shown in FIG. The reversing control of the motor unit 11 is performed with the position immediately before the other end position of the swing as the upper reversing position P2, and the buckling that may occur when the lever 22 and the rod 21 are arranged on the straight line L2 is prevented. Based on such control of the wiper control circuit X, the reciprocating wiping operation of the wiper 2 is performed.

  In the present embodiment, a stopper 15c is provided on the motor housing 15 as a configuration that mechanically and reliably prevents buckling that may occur when the lever 22 and the rod 21 are aligned on the straight line L2. The stopper 15c is located between the predetermined position shown in FIG. 3 just before the lever 22 and the rod 21 are aligned on the straight line L2 at the upper reversing position P2 of the wiper 2, and the position where they are arranged outside the upper reversing position P2. That is, it does not interfere with the crank 20 at the upper reversal position P2, and abuts against the crank 20 before the lever 22 and the rod 21 are aligned on the straight line L2, and mechanically restricts the further outward movement of the lever 22. ing.

Next, characteristic effects of the present embodiment will be described.
(1) The link mechanism 12 provided in the wiper motor 10 includes a double lever mechanism in which a crank 20 on the motor unit 11 side and a lever 22 on the output shaft 10a side are connected by a rod 21. The stop / lower reverse position P1 of the wiper 2 is set to a swing end position (first position) where the crank 20 and the rod 21 are aligned on the straight line L1. Prior to the second position arranged on a straight line on the side opposite to the first position, the lever 22 and the rod 21 are set to positions just before the line is arranged on the straight line L2. The motor unit 11 is driven forward / reversely between the stop / lower reverse position P1 and the upper reverse position P2 of the wiper 2 set as described above. That is, in such a link mechanism 12, buckling may occur when the lever 22 and the rod 21 that drive the output shaft 10a (wiper 2) are aligned on the straight line L2 at the upper reversal position P2, but the position just before that Thus, the reverse rotation of the motor unit 11 can prevent the occurrence of buckling. Thereby, even if the load outside the operating range is applied to the wiper 2, the next wiping operation of the wiper 2 can be appropriately executed.

  (2) Since the link mechanism 12 composed of both lever mechanisms is configured such that the rod 21 is short and the crank 20 and the lever 22 operate within a range of less than ½ rotation, the link mechanism 12 and thus the wiper motor 10. Can be miniaturized.

  (3) Between the position immediately before the lever 22 and the rod 21 are aligned on the straight line L2 at the upper reversal position P2, and the position where they are aligned outside the upper reversal position P2, the lever 22 is further moved outward. A stopper 15c that contacts the crank 20 is provided to restrict movement. That is, the stopper 15c does not interfere with the crank 20 even when it reaches the upper reversal position P2 during a normal wiper wiping operation, and the lever 22 moves further outward from the upper reversal position P2 so that the lever 22 and the rod 21 Contacts the crank 20 before they are aligned on the straight line L2, and mechanically restricts the further outward movement of the lever 22. Thereby, the buckling which may occur when the lever 22 and the rod 21 are arranged on the straight line L2 can be reliably prevented. In addition, you may have the elastic member which prevents the collision sound with the crank 20 in the stopper 15c. In addition, the stopper 15c is in contact with the crank 20, but may be configured to be in contact with at least one of the crank 20, the rod 21, and the lever 22.

  (4) A reduction gear 14 interposed between the motor unit 11 and the link mechanism 12 is formed in a fan shape corresponding to forward and reverse rotation of the motor unit 11. That is, since unnecessary portions of the reduction gear 14 are omitted, the wiper motor 10 can be reduced in size and weight.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
5 to 7 show the wiper motor 30 in the wiper device of the present embodiment. 5 and 6 are plan views seen from the lower surface side (link mechanism 32 side) of the wiper motor 30 with the cover 36 removed.

  The wiper motor 30 of the present embodiment is configured by integrally assembling a motor unit 31 and a link mechanism 32 that is drivingly connected to the motor unit 31. Similarly, the motor unit 31 of the present embodiment is constituted by a DC motor having a power supply brush (not shown), and the rotating shaft 33 is driven forward and backward. A worm 33a is formed integrally with the rotary shaft 33, and a reduction gear 34 made of a worm wheel is engaged with the worm 33a. The reduction gear 34 and the worm 33a of the rotary shaft 33 constitute a reduction mechanism. The reduction gear 34 is accommodated in the gear accommodating part 35a of the motor housing 35 of the wiper motor 30, and the cover 36 is attached to the opening part of the gear accommodating part 35a.

  The reduction gear 34 has a first gear portion 34a having teeth on the outer peripheral surface and meshing with the worm 33a of the rotary shaft 33, and has a smaller diameter than the first gear portion 34a and teeth on the outer peripheral surface, and is coaxial with the gear portion 34a. And a second gear portion 34b provided integrally therewith. A through hole 34c having a circular cross section is formed at the center of the reduction gear 34, and a support cylindrical portion 35b provided in the gear housing portion 35a is inserted into the through hole 34c. In the reduction gear 34, the inner peripheral surface of the through hole 34c abuts on a bearing 37 attached to the outer peripheral surface of the support cylindrical portion 35b, and is rotatably supported by the bearing 37.

  The link mechanism 32 is housed in a link housing portion 36a formed integrally with the cover 36, and includes a crank 40, a rod 41, and a lever 42. A fan-like connection gear 43 that meshes with the second gear portion 34 b of the reduction gear 34 is fixed to the base end portion of the crank 40. The base end of the crank 40 and the connecting gear 43 are formed with shaft holes 40a and 43a having a circular cross section, and a shaft 35c standing on the motor housing 35 is inserted into each of the shaft holes 40a and 43a. ing. The crank 40 and the connecting gear 43 are rotatably supported by the support shaft 35c. That is, when the reduction gear 34 is rotated by driving the motor unit 31, the tip side of the crank 40 is rotated around the support shaft 35c due to the meshing of the second gear unit 34b and the connecting gear 43.

  The distal end portion of the crank 40 is rotatably connected to one end of the rod 41 by a connecting pin 44, and the other end of the rod 41 is rotatably connected to the distal end portion of the lever 42 by a connecting pin 45. The base end portion of the output shaft 30 a is fixed to the base end portion of the lever 42. The output shaft 30a is inserted into the support cylindrical portion 35b of the gear housing portion 35a, and is rotatably supported by a bearing (not shown) attached to the inner peripheral surface of the support cylindrical portion 35b. The output shaft 30a is arranged coaxially with the reduction gear 34 to save space. The distal end portion of the output shaft 30a protrudes from the support cylindrical portion 35b to the outside of the motor housing 35, and the wiper arm 2a of the wiper 2 is fixed.

  Here, in the link mechanism 32 of the present embodiment, the crank 40 is formed to be approximately the same length as the lever 42 and the rod 41 is formed to be approximately half the length of the crank 40. / It consists of a double lever mechanism that reciprocates in a range of less than 2 rotations. That is, the length a from the rotation center of the crank 40 to the connection point with the rod 41, the length b between the connection points at both ends of the rod 41, the length c from the rotation center of the lever 42 to the connection point with the rod 41, and When the inter-axis pitch d between the rotating shaft (support shaft 35c) of the crank 40 and the rotating shaft (output shaft 30a) of the lever 42, the length a in the crank 40 is substantially the same as the length c in the lever 42. The inter-axis pitch d is set to be shorter than the lengths a and c, and the length b of the rod 41 is set to be the shortest. Thereby, in this embodiment, the rotation angle of the lever 42 is set to about 90 °, and the rotation angle of the crank 40 is set to about 110 °.

  In this link mechanism 32, as shown in FIG. 5, also in this embodiment, the crank 40 and the rod 41 are aligned on the straight line L 1, and the position of the lever 42 where the crank 40, the rod 41 and the lever 42 form a triangle is This is a swing end position (first position). In this embodiment, this swing end position is set to a stop / lower reverse position P1 (see FIG. 1) of the wiper 2. On the other hand, prior to the second position where the crank 40 and the rod 41 are aligned on the opposite side of the first position (the position where the crank 40 and the rod 41 are aligned and aligned with each other), the lever 42 The rod 41 is aligned with the straight line L2, and the position of the lever 42 where the crank 40, the rod 41, and the lever 42 form a triangle is the other end of the swinging position. In this embodiment, the lever 42, the rod 41, 6 is set to the upper reversal position P2 of the wiper 2 (predetermined position where the connecting point O1 of the lever 42 and the rod 41 is on the inner side of the straight line L2) shown in FIG. (See FIG. 1).

  The wiper control circuit X of the present embodiment also performs stop or reverse control of the motor unit 31 with the one end position of the lever 42 shown in FIG. 5 as the stop / lower reverse position P1, and controls the lever 42 shown in FIG. The reversing control of the motor unit 31 is performed with the position immediately before the other end of the swinging as the upper reversing position P2, and buckling that may occur when the lever 42 and the rod 41 are arranged on the straight line L2 is prevented. In this embodiment, the reciprocating wiping operation of the wiper 2 is performed based on the control of the wiper control circuit X.

  Incidentally, also in the present embodiment, the cover 36 is provided with a stopper 36b as a configuration that mechanically and reliably prevents buckling that may occur when the lever 42 and the rod 41 are aligned on the straight line L2. The stopper 36b is located between the predetermined position shown in FIG. 6 immediately before the lever 42 and the rod 41 are aligned on the straight line L2 at the upper reversing position P2 of the wiper 2, and the position where they are arranged outside the upper reversing position P2. That is, it does not interfere with the crank 40 at the upper reversal position P2, and abuts against the crank 40 before the lever 42 and the rod 41 are aligned on the straight line L2, thereby mechanically restricting the further outward movement of the lever 42. ing.

  Also in the present embodiment having such a configuration, the same operational effects as the operational effects (1) to (3) of the first embodiment can be obtained. In addition, a reduction gear 34 interposed between the motor unit 31 and the link mechanism 32 is disposed coaxially with the output shaft 30a. Therefore, a space for arranging the output shaft 30 a inside the reduction gear 34 can be secured, which can contribute to the downsizing of the wiper motor 30.

In addition, you may change embodiment of this invention as follows.
-You may change suitably the structure of the wiper motors 10 and 30 of each said embodiment. For example, the motor units 11 and 31 may be motors other than a DC motor with a power supply brush. Further, although the reduction mechanism using one reduction gear 14 or 34 is used, the reduction mechanism may be constituted by a plurality of reduction gears. Moreover, you may change suitably the shape, arrangement | positioning, etc. of each member of the link mechanisms 12 and 32. FIG.

  In each of the above embodiments, the wiper motors 10 and 30 operate each of the pair of wipers 2 for wiping the vehicle windshield 1. However, the wiper motor for wiping the rear glass and the pair of wipers for driving the pair of wipers by one. You may implement with a wiper motor.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In the wiper device according to claim 6,
The wiper device according to claim 1, wherein the link mechanism is configured such that a length between connecting points on both ends of the rod is shorter than an inter-axis pitch between a rotation shaft of the crank and the output shaft.

In this way, it is possible to provide a wiper device that obtains the same effects as those of the second aspect.
(B) In the wiper device according to claim 6 or (a),
The link mechanism is housed in a housing member;
In the housing member, the position immediately before the lever and the rod are aligned on the upper reversing position of the wiper, and the lever and the rod positioned on the outer side of the upper reversing position are aligned on the straight line. A wiper device comprising a stopper that contacts at least one of the crank, the rod, and the lever in order to restrict further outward movement of the lever between positions.

In this way, it is possible to provide a wiper device that obtains the same effect as that of the third aspect.
(C) In the wiper device according to any one of (6) and (a) and (b) above,
The wiper motor has a reduction gear that meshes with a worm provided integrally with the rotation shaft of the motor unit and transmits the driving force of the motor unit to the link mechanism, and the reduction gear corresponds to forward and reverse rotation of the motor unit. A wiper device formed in a fan shape.

In this way, it is possible to provide a wiper device that obtains the same effect as that of the fourth aspect.
(D) The wiper device according to claim 6 or any one of (b) and (b) above,
The wiper motor has a reduction gear that meshes with a worm provided integrally with the rotation shaft of the motor unit and transmits the driving force of the motor unit to the link mechanism, and the reduction gear is relatively rotated coaxially with the output shaft. A wiper device characterized by being arranged.

  In this way, it is possible to provide a wiper device that obtains the same effect as that of the fifth aspect.

It is a schematic block diagram of a wiper apparatus. It is a top view of the wiper motor in a 1st embodiment. It is a top view of the wiper motor in a 1st embodiment. It is a disassembled perspective view of the wiper motor in a 1st embodiment. It is a top view of the wiper motor in a 2nd embodiment. It is a top view of the wiper motor in a 2nd embodiment. It is a disassembled perspective view of the wiper motor in a 2nd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Wiper, 10, 30 ... Wiper motor, 10a, 30a ... Output shaft, 11, 31 ... Motor part, 12, 32 ... Link mechanism, 13, 33 ... Rotary shaft, 13a, 33a ... Worm, 14, 34 ... Reduction gear 20, 40 ... crank, 21, 41 ... rod, 22, 42 ... lever, 15 ... motor housing (housing member), 15c ... stopper, 36 ... cover (housing member), 36b ... stopper, X ... wiper control circuit, L1, L2 ... straight line, P1 ... stop / lower reverse position (stop position or lower reverse position), P2 ... upper reverse position, b ... length between connecting points, d ... pitch between axes.

Claims (6)

A motor unit that is configured by integrally assembling a motor unit that is driven forward / reversely and a link mechanism that is drivingly connected to the motor unit, and has an output shaft to which the wiper is fixed.
In the link mechanism, a crank that reciprocally swings by driving of the motor unit and a lever to which the output shaft is fixed are rotatably connected via a rod, and the output shaft can be reciprocated within a range of less than ½ rotation. The wiper stopping position or lower reversing position is set to a first position where the crank and the rod are aligned in a straight line, and the upper reversing position of the wiper is defined as the crank and the reversing position. Prior to the second position where the rod and the rod are aligned on the opposite side of the first position, the rod and the rod are set at a position immediately before being aligned.
The wiper motor according to claim 1, wherein the motor unit is driven forward / reversely between a stop position of the wiper or a lower reverse position and an upper reverse position. The wiper motor according to claim 1,
The wiper motor according to claim 1, wherein the link mechanism is configured such that a length between connecting points on both ends of the rod is shorter than a pitch between the rotation shaft of the crank and the output shaft. The wiper motor according to claim 1 or 2,
The link mechanism is housed in a housing member;
In the housing member, the position immediately before the lever and the rod are aligned on the upper reversing position of the wiper, and the lever and the rod positioned on the outer side of the upper reversing position are aligned on the straight line. A wiper motor comprising a stopper that contacts at least one of the crank, the rod, and the lever in order to restrict further outward movement of the lever between the positions. The wiper motor according to any one of claims 1 to 3,
A reduction gear that meshes with a worm provided integrally with the rotation shaft of the motor unit and transmits the driving force of the motor unit to the link mechanism is formed in a fan shape corresponding to forward and reverse rotation of the motor unit. A wiper motor characterized by being made. The wiper motor according to any one of claims 1 to 3,
A reduction gear that meshes with a worm provided integrally with the rotation shaft of the motor unit and transmits the driving force of the motor unit to the link mechanism is disposed coaxially with the output shaft so as to be relatively rotatable. A wiper motor characterized by A wiper motor comprising a motor unit and a link mechanism that is drivingly connected to the motor unit, and an output shaft to which the wiper is fixed;
A wiper device including a wiper control circuit that drives the motor unit forward and backward, transmits the driving force to the output shaft via the link mechanism, and reciprocally swings the wiper;
In the link mechanism, a crank that reciprocally swings by driving of the motor unit and a lever to which the output shaft is fixed are rotatably connected via a rod, and the output shaft can be reciprocated within a range of less than ½ rotation. It consists of a moving double lever mechanism,
The wiper control circuit sets a first position where the crank and the rod are aligned in a straight line as a stop position or a lower reverse position of the wiper, and the crank and the rod are opposite to the first position. Prior to the second position aligned on a straight line, the position immediately before the lever and the rod are aligned on a straight line is defined as the upper reversal position of the wiper, and the motor unit is stopped at the wiper, or the lower reversal position and the upper reversal position. A wiper device characterized by forward / reverse control between

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