JP5391098B2 - Wiper device - Google Patents

Description

  The present invention relates to a wiper device for wiping a front window or the like of a vehicle.

  2. Description of the Related Art Conventionally, a wiper device includes a wiper motor that rotationally drives an output shaft, and first and second crank arms that extend in the direction orthogonal to the axis from one end of the output shaft and extend on opposite sides around the axis of the output shaft. In some cases, a lever for driving a wiper is connected to the first and second crank arms via a link rod (for example, see Patent Document 1).

  In this wiper device, by rotating the output shaft of the wiper motor forward and reverse, the two levers (driver's seat side and passenger's seat side) are moved relative to the pivot point while avoiding interference between the two link rods. Both of them can be rotated on the same direction side (for example, the upper (top) side), and the two levers are reciprocally rotated (oscillated) in synchronization with opposite directions. Therefore, for example, the arrangement space including the driving range can be reduced as compared with the configuration in which the two levers are arranged on the opposite sides (upper side and lower side) and rotated with respect to the rotation fulcrum.

JP 2009-29407 A

  However, the wiper device as described above requires a control circuit for rotating the output shaft of the wiper motor in the forward and reverse directions, and there is a problem that the wiper device is expensive due to the control circuit. Also, for example, in a so-called opposed wiper device, the output shaft can be rotated in the same direction (for example, the upper side) with respect to the rotation fulcrum while having only one crank arm without rotating the output shaft forward and backward. In order to reciprocally rotate (swing) the two levers synchronized with each other in the opposite direction, an intermediate link is also generally provided. In this case, the intermediate link has the number of parts and the number of assembly steps. This increases the cost and causes an increase in cost and size.

  The present invention has been made to solve the above-described problems, and an object thereof is to reduce the arrangement space and to require a control circuit for rotating the output shaft forward and backward. And providing a wiper device that can perform a desired wiping operation.

According to the first aspect of the present invention, the wiper motor that rotationally drives the output shaft, and the first and second crank arms that extend in the direction orthogonal to the axis from the output shaft and that extend on opposite sides around the axis of the output shaft, A first link rod having a proximal end connected to the distal end of the first crank arm, the distal end being driven and connected to a first lever that drives the first wiper, and a distal end of the second crank arm; A wiper device having an end connected and a second link rod drivingly connected to a second lever for driving the second wiper, wherein the first crank arm is one end of the output shaft The second crank arm is fixed to the other end of the output shaft, and when viewed from the axial direction of the output shaft, the axis of the output shaft, the first crank arm, the first link rod, Connecting point of The state where the connection points of the first link rod and the first lever are aligned on the first straight line is set to correspond to the stop position of the first wiper, and viewed from the axial direction of the output shaft, A state in which the axis of the output shaft, the connection point between the second crank arm and the second link rod, and the connection point between the second link rod and the second lever are aligned on a second straight line, The gist is that it is set to correspond to the stop position of the second wiper .

  According to the same configuration, if the output shaft is rotationally driven in one direction, it is on the same direction side (for example, the upper side) with respect to the rotation fulcrum while avoiding interference between the first link rod and the second link rod. The first lever and the second lever which can be rotated can be reciprocally rotated (oscillated) in synchronization with each other in opposite directions. Therefore, the arrangement space including the drive range can be reduced, and a desired wiping operation can be performed without requiring a control circuit for rotating the output shaft forward and backward.

  According to this configuration, at the stop position of the first wiper, the axis line of the output shaft and the respective connection points are set so as to be aligned on the first straight line. The output shaft is difficult to rotate due to the applied external force. Further, since the axis of the output shaft and each of the connection points are set so as to be aligned on the second straight line at the stop position of the second wiper, the output is generated by an external force applied to the second wiper, for example, as compared with the case where they are not aligned. The shaft is difficult to rotate. Furthermore, the stop position of each crank arm is set so that each point is on the first straight line and the second straight line at the stop position. For example, the wiper motor (output shaft) is brought closer to the hollow frame in order to reduce the size. Even if the first straight line and the second straight line are not the same straight line, both the first and second link rods can be stopped at the swing end, and the first and second wipers The inversion operation can be performed simultaneously without variation.

In the invention according to claim 2, claim the wiper apparatus according to 1, and the length from the output shaft to the connection point between the first crank arm and the first link rod, the second from the output shaft The gist is that the length to the connection point between the crank arm and the second link rod is different.

  According to this configuration, the amount of movement of the first link rod and the second link rod, and hence the amount of rotation and the position of rotation of the first lever and the second lever can be made different, and the first wiper and the second wiper are different. A desired wiping operation (wiping angle, wiping speed, etc.) can be set.

According to a third aspect of the present invention, in the wiper device according to the first or second aspect , the first lever rotates the first wiper in the same direction as the rotation direction of the first wiper. The second lever constitutes a part of a link mechanism and is driven to rotate in the direction opposite to the second wiper that rotates in the same direction as the first wiper.

  According to this configuration, although it is a so-called parallel interlocking wiper device that rotates the first wiper and the second wiper in the same direction (substantially in parallel), the wiping range of the second wiper is simply a fan shape by the link mechanism. In the wiper device in which the second lever must be rotated in the direction opposite to the second wiper in order to obtain a different desired wiping range, the effect of the invention according to claim 1 can be obtained.

According to a fourth aspect of the present invention, in the wiper device according to the first or second aspect , the first lever rotates the first wiper in the same direction as its own rotation direction. The gist of the invention is that the second lever is driven to rotate in the same direction as the second wiper that rotates in the opposite direction to the first wiper.

  According to this configuration, in the so-called opposed wiper device that rotates the first wiper and the second wiper in directions opposite to each other, for example, the effect of the invention according to claim 1 can be obtained. Of course, according to the configuration of the first aspect, the first lever and the second lever can be reciprocally rotated (oscillated) in synchronization with each other in the opposite directions. Therefore, the first lever and the second lever (first An intermediate link or the like for rotating the wiper and the second wiper) in opposite directions is not required.

  According to the present invention, it is possible to provide a wiper device that can reduce the arrangement space and can perform a desired wiping operation without requiring a control circuit for rotating the output shaft forward and backward. be able to.

(A) The top view of the wiper apparatus in this Embodiment. (B) The side view of a wiper apparatus similarly. The schematic diagram for demonstrating the opposing-type wiper apparatus in another example. (A) The schematic plan view for demonstrating the opposing-type wiper apparatus in another example. (B) The schematic side view for demonstrating the opposing-type wiper apparatus in another example.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the wiper device includes a wiper motor 11, a hollow frame 12, a pivot holder 13, a four-bar linkage mechanism 14, first and second crank arms 15 and 16, and first and second links. Rods 17, 18 and the like.

  The wiper motor 11 houses a motor main body 21 that rotates a rotating shaft (not shown) and a speed reduction mechanism (specifically, a worm and a worm wheel) inside the gear housing 22a, and rotates the output shaft 22b by decelerating the rotation of the rotating shaft. And a deceleration portion 22 to be operated. Here, the output shaft 22b of the present embodiment has one end 22c (the lower end in FIG. 1B) protruding from the gear housing 22a, and the other end 22d (FIG. 1B). The middle and upper end portions are also supported rotatably with respect to the gear housing 22a so as to protrude from the gear housing 22a. The wiper motor 11 continuously drives the output shaft 22b in only one direction, and does not have a control circuit for rotating the output shaft 22b forward and backward. The wiper motor 11 is fixed to an intermediate portion of the hollow frame 12, that is, is disposed between a first pivot shaft 23 and a second pivot shaft 36 which will be described later.

  The pivot holder 13 is fixed to one end (the left end in FIG. 1) of the hollow frame 12, and rotatably supports the first pivot shaft 23 in a state substantially parallel to the output shaft 22b. A first lever 24 extending in the direction perpendicular to the axis is fixed to one end of the first pivot shaft 23 (the lower end in FIG. 1B). Note that the first lever 24 of the present embodiment is set so as to be rotatable upward (upward in the state of being provided on the vehicle body) with respect to the rotation fulcrum (axis A of the first pivot shaft 23). Has been. A first wiper 25 (shown schematically by a two-dot chain line in FIG. 1A) is fixed to the other end of the first pivot shaft 23 (the upper end in FIG. 1B). Will be. The pivot holder 13 is provided with a fixing portion 13a to the vehicle body (not shown), and the fixing portion 13a is fixed to the vehicle body (in this embodiment, the lower body on the driver seat side of the front window). It will be. In this configuration, when the first lever 24 is rotated, the first pivot shaft 23 and thus the first wiper 25 are driven to rotate in the same direction as the own rotation direction.

  The four-bar linkage 14 includes a fixed lever 31 fixed to the other end (right end in FIG. 1) of the hollow frame 12, and a second pivot shaft supported rotatably on the hollow frame 12 side of the fixed lever 31. 36 is provided with a second lever 32 whose base end is fixed. Note that the second lever 32 of the present embodiment is set so as to be rotatable upward (upward in the state of being provided on the vehicle body) with respect to the rotation fulcrum (axis B of the second pivot shaft 36). Has been. Further, as shown in FIG. 1A, the second lever 32 of the present embodiment has a connection point (axis B) with the second pivot shaft 36 when viewed from the rotational axis direction of the second pivot shaft 36. To an acute angle (in the present embodiment, about 50 °) is formed in a bifurcated and extending shape (ie, substantially V-shaped), one of which is an input piece 32a and the other is an output piece 32b. ing.

  The four-bar link mechanism 14 includes a driven lever 33 whose base end is rotatably supported at a position away from the hollow frame 12 of the fixed lever 31, an output piece 32 b of the second lever 32, and the driven lever 33. It has the connection lever 34 supported so that rotation is possible with respect to each so that the front-end | tips may be connected. In this embodiment, the length of the driven lever 33 (the length between the connection points C and D) is the length of the output piece 32b of the second lever 32 (between the axis B and the connection point E). Length) is set longer. The connecting lever 34 is provided with a wiper fixing shaft 34a extending substantially parallel to the output shaft 22b. The wiper fixing shaft 34a of the present embodiment is erected at the tip of an extending portion 34b that extends in a substantially perpendicular direction from a connection point E with the second lever 32 (output piece 32b) in the connecting lever 34. ing.

  The second wiper 35 (schematically shown by a two-dot chain line in FIG. 1A) is fixed to the wiper fixing shaft 34a. In addition, the fixing lever 31 is provided with a fixing portion 31a to the vehicle body (not shown), and the fixing portion 31a is fixed to the vehicle body (in this embodiment, the lower body on the passenger seat side of the front window). It will be. In this configuration, when the second lever 32 is rotated, the second lever 32 is driven to rotate in the opposite direction to the wiper fixing shaft 34 a and, consequently, the second wiper 35 that rotates in the same direction as the first wiper 25. Become. At this time, the wiper fixing shaft 34a is moved by the four-bar linkage mechanism 14 (refer to the movement locus K in FIG. 1), so that the wiping range of the second wiper 35 is different from a mere fan shape (desired in advance). ) To be wiped out.

  The first and second crank arms 15 and 16 are fixed to the output shaft 22b so as to extend in the direction orthogonal to the axis from the output shaft 22b and to extend on opposite sides around the axis X of the output shaft 22b. The term “extends in the opposite direction” means that the output shafts 22b extend apart from each other so as to have an angle larger than 90 ° with respect to the axis X of the output shaft 22b. In other words, a plane perpendicular to the straight line L1 (through the axis X of the output shaft 22b) that connects the tip of the first crank arm 15 (the connection point F with the first link rod 17) and the axis X of the output shaft 22b. On the other hand, the second crank arm 16 extends to the opposite side (of the first crank arm 15).

  As shown in FIG. 1B, the first crank arm 15 of the present embodiment has a base end fixed to one end 22c of the output shaft 22b, and the second crank arm 16 has a base end. The portion is fixed to the other end portion 22d of the output shaft 22b.

  The base end of the first link rod 17 is connected to the tip of the first crank arm 15 so that it can roll (via a ball joint), and the tip of the first link rod 17 is connected to the first lever 24 (ball joint). Via). The second link rod 18 is connected to the distal end portion of the second crank arm 16 so that the second link rod 18 can roll (via a ball joint), and the distal end portion is connected to the input piece 32a of the second lever 32. It is connected so that it can roll (via a ball joint). In the present embodiment, the length from the output shaft 22b (its axis X) to the connection point F between the first crank arm 15 and the first link rod 17 is the second from the output shaft 22b (its axis X). It is set slightly longer than the length to the connection point G between the crank arm 16 and the second link rod 18.

  Further, as shown in FIG. 1 (a), the wiper device of the present embodiment, when viewed from the axial direction of the output shaft 22b, the axis X of the output shaft 22b, the first crank arm 15 and the first link rod. The connecting point F with the first link rod 17 and the connecting point H with the first lever 24 are arranged on the first straight line LA so as to correspond to the stop position of the first wiper 25. Yes.

  Further, when viewed from the axial direction of the output shaft 22b, the axis X of the output shaft 22b, the connection point G between the second crank arm 16 and the second link rod 18, the second link rod 18 and the second lever 32 ( The state where the connection point I with the input piece 32a) is aligned on the second straight line LB is set so as to correspond to the stop position of the second wiper 35. The stop positions of the first and second wipers 25 and 35 are positions substantially along the lower end of the front window. In the present embodiment, the angle at which the first straight line LA and the second straight line LB intersect (that is, the angle formed by the first crank arm 15 and the second crank arm 16) is about 165 °. Yes.

  In the wiper device configured as described above, when the output shaft 22b is rotationally driven in one direction, the first lever 24 and the second lever 32 are reciprocally rotated (oscillated) in synchronization with each other in opposite directions. The Then, the first wiper 25 is rotationally driven in the same direction as the first lever 24 (integrally), and the second wiper 35 is moved together with the wiper fixing shaft 34a by the four-bar linkage mechanism 14. (Refer to the movement trajectory K in FIG. 1), however, the second lever 32 is rotationally driven in the same direction as the first wiper 25, which is opposite to the rotational direction of the second lever 32.

Next, characteristic effects of the above embodiment will be described below.
(1) The first crank arm 15 has a base end fixed to one end 22c of the output shaft 22b, and extends to the opposite side of the first crank arm 15 around the axis X of the output shaft 22b. The base end is fixed to the other end 22d of the output shaft 22b. Therefore, if the output shaft 22b is rotationally driven in one direction, the rotation fulcrum (the axis A of the first pivot shaft 23 and the first pivot shaft 23) is prevented while avoiding interference between the first link rod 17 and the second link rod 18. The first lever 24 and the second lever 32 which are rotatable in the same direction side (upper side in the present embodiment) with respect to the axis B) of the two pivot shafts 36 are reciprocally rotated in synchronization with each other in opposite directions. (Oscillate). Therefore, the arrangement space including the drive range can be reduced, and a desired wiping operation can be performed without the need for a control circuit for rotating the output shaft 22b forward and backward.

  (2) At the stop position of the first wiper 25, the axis X of the output shaft 22b and the connection points F and H are set so as to be aligned on the first straight line LA. The output shaft 22b is difficult to rotate due to the external force applied to the first wiper 25. Further, at the stop position of the second wiper 35, the axis X of the output shaft 22b and the connection points G and I are set so as to be aligned on the second straight line LB. 2 The output shaft 22b is difficult to rotate due to an external force applied to the wiper 35. Further, since the stop positions of the crank arms 15 and 16 are set so that the respective points are on the first straight line LA and the second straight line LB at the stop position, the wiper motor is to be reduced in size as in the present embodiment. 11 (output shaft 22b) is arranged closer to the hollow frame 12, that is, even if the first straight line LA and the second straight line LB are not the same straight line, the first and second link rods 17, 18 Both can be stopped at the swing end, and the first and second wipers 25, 35 can be simultaneously reversed without any variation.

  (3) The length from the output shaft 22b (its axis X) to the connection point F between the first crank arm 15 and the first link rod 17 is the same as that of the output crank 22b (its axis X) to the second crank arm 16. It is set slightly longer than the length to the connection point G with the two link rods 18. Therefore, the amount of movement of the first link rod 17 and the second link rod 18 (at the base end portion), and hence the amount of rotation and the position of rotation of the first lever 24 and the second lever 32 are made different, and the first wiper 25 and With the second wiper 35, a desired wiping operation (wiping angle, wiping speed, etc.) can be set.

  (4) When the first lever 24 is rotated, the first lever 24 is driven to rotate the first pivot shaft 23, and thus the first wiper 25 in the same direction as its own rotation direction. 32 constitutes a part of the four-bar linkage mechanism 14, and when it rotates, it rotates in the opposite direction to the wiper fixing shaft 34 a and thus the second wiper 35 that rotates in the same direction as the first wiper 25. It is a dynamic drive. Therefore, although the first wiper 25 and the second wiper 35 are so-called parallel interlocking wiper devices that synchronize and interlock in the same direction (substantially in parallel), the wiping range of the second wiper 35 is simply fan-shaped by the four-bar linkage mechanism 14. In the wiper device in which the second lever 32 must be rotated in the direction opposite to the second wiper 35 in order to obtain a desired wiping range different from the above, the effect (1) described above can be obtained.

The above embodiment may be modified as follows.
In the above embodiment, the second lever 32 constitutes a part of the four-bar linkage mechanism 14, and when it rotates, it rotates in the same direction as the wiper fixing shaft 34 a and thus the first wiper 25. The second wiper 35 is driven to rotate in the opposite direction, but is not limited to this, and the second lever is moved in the same direction as the second wiper that rotates in the opposite direction to the first wiper 25. It may be driven to rotate. Specifically, as shown in FIGS. 2 and 3, when the second lever 51 (see FIG. 3A) is rotated as in the first lever 24 described above, the second pivot shaft 52. As a result, the second wiper 53 is driven to rotate in the same direction as its own rotation direction, and the first wiper 25 and the second wiper 53 are rotated in directions opposite to each other. Also good. Even if it does in this way, the effect similar to the effect (1) of the said embodiment can be acquired. Of course, the first lever 24 and the second lever 51 can be reciprocally rotated (oscillated) in synchronization with each other in the opposite directions by the configuration of the above embodiment. An intermediate link or the like for rotating the lever 51 (the first wiper 25 and the second wiper 53) in opposite directions is unnecessary.

  In addition, for example, the first lever 24 of the above embodiment forms a part of a four-bar linkage mechanism like the second lever 32 of the above embodiment, and when the first lever 24 is rotated, the first wiper The wiper fixing shaft for fixing the first wiper and, as a result, the first wiper and the second wiper 53 are both driven to rotate in the direction opposite to the first wiper, and the first wiper and the second wiper are both connected via the four-bar linkage mechanism. You may embody in what is called a counter-type wiper apparatus which rotates 53 to a mutually opposing direction. Even if it does in this way, the effect similar to the effect (1) of the said embodiment can be acquired.

  In the above embodiment, the length from the output shaft 22b (its axis X) to the connection point F between the first crank arm 15 and the first link rod 17 is the same as that of the output shaft 22b (its axis X) to the second crank. Although it is set to be slightly longer than the length to the connection point G between the arm 16 and the second link rod 18, it is not limited to this, and for example, both lengths may be changed to the same length. . If the length is the same, the first crank arm 15 and the second crank arm 16 can be configured as common parts, and the types of parts can be reduced.

  In the above embodiment, when the angle at which the first straight line LA and the second straight line LB intersect (that is, the angle formed by the first crank arm 15 and the second crank arm 16) is about 165 °. However, the present invention is not limited to this. For example, the angle may be changed to 180 ° according to the arrangement of the wiper motor.

  In the above-described embodiment, the wiper device includes the four-bar linkage mechanism 14, but is not limited thereto, and the four-bar link mechanism 14 is changed to a link mechanism having a different number of nodes, for example, six nodes. And may be embodied. Even if it does in this way, the effect similar to the effect of the said embodiment can be acquired, obtaining the peculiar effect (desired wiping range) by the changed link mechanism.

  DESCRIPTION OF SYMBOLS 11 ... Wiper motor, 14 ... Four-bar linkage mechanism (link mechanism), 15 ... 1st crank arm, 16 ... 2nd crank arm, 17 ... 1st link rod, 18 ... 2nd link rod, 22b ... Output shaft, 22c ... One end, 22d ... the other end, 23 ... first pivot shaft, 24 ... first lever, 25 ... first wiper, 32, 51 ... second lever, 34a ... wiper fixing shaft, 36, 52 ... second pivot shaft 35, 53 ... second wiper, F, G, H, I ... connection point, LA ... first straight line, LB ... second straight line, X ... axis.

Claims (4)

A wiper motor that rotationally drives the output shaft;
First and second crank arms extending from the output shaft in the direction perpendicular to the axis and extending on opposite sides around the axis of the output shaft;
A first link rod having a base end connected to a tip of the first crank arm and a tip connected to a first lever for driving the first wiper;
A wiper device comprising a second link rod having a base end connected to a tip of the second crank arm and a tip linked to a second lever for driving the second wiper;
The first crank arm is fixed to one end of the output shaft, and the second crank arm is fixed to the other end of the output shaft ,
When viewed from the axial direction of the output shaft, an axis of the output shaft, a connection point between the first crank arm and the first link rod, and a connection point between the first link rod and the first lever are: The state aligned on the first straight line is set to correspond to the stop position of the first wiper,
When viewed from the axial direction of the output shaft, an axis of the output shaft, a connection point between the second crank arm and the second link rod, and a connection point between the second link rod and the second lever are: A wiper device characterized in that a state of being aligned on a second straight line is set so as to correspond to a stop position of the second wiper . The wiper device according to claim 1 ,
The length from the output shaft to the connection point between the first crank arm and the first link rod is different from the length from the output shaft to the connection point between the second crank arm and the second link rod. A wiper device characterized by the above. The wiper device according to claim 1 or 2 ,
The first lever rotates the first wiper in the same direction as its own rotation direction,
The wiper device, wherein the second lever constitutes a part of a link mechanism and is driven to rotate in a direction opposite to the second wiper that rotates in the same direction as the first wiper. The wiper device according to claim 1 or 2 ,
The first lever rotates the first wiper in the same direction as its own rotation direction,
The wiper device, wherein the second lever is rotationally driven in the same direction as the second wiper that rotates in a direction opposite to the first wiper.

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