WO2017043324A1

WO2017043324A1 - Wiper device

Info

Publication number: WO2017043324A1
Application number: PCT/JP2016/074787
Authority: WO
Inventors: 秀基白鳥; 則幸鈴木; 雄司榊原
Original assignee: アスモ株式会社
Priority date: 2015-09-08
Filing date: 2016-08-25
Publication date: 2017-03-16

Abstract

The wiper device includes a first pivot shaft, a first swing lever, a second pivot shaft, a second swing lever, a link rod, a crank arm, and a drive rod. The first swing lever extends from the first pivot shaft in a radial direction of the first pivot shaft and integrally rotates with the first pivot shaft. The second swing lever extends from the second pivot shaft in a radial direction of the second pivot shaft and integrally rotates with the second pivot shaft. The link rod has a first end connected to a tip part of the first swing lever and a second end connected to a tip part of the second swing lever. The crank arm extends from an output shaft of a motor in a radial direction of this output shaft and integrally rotates with the output shaft. The drive rod has a first end connected to a tip part of the crank arm and a second end connected to an intermediate part of the link rod.

Description

Wiper device

The present invention relates to a wiper device.

Conventionally, as a wiper device, a first swing lever that extends in a direction perpendicular to the axis from a first pivot shaft, a second swing lever that extends in a direction perpendicular to the axis from a second pivot shaft, and one end of the first swing lever And a connecting rod having the other end connected to the tip of the second swing lever (see, for example, Patent Document 1). The wipers fixed to the first and second pivot shafts perform a wiping operation synchronously. In this wiper device, the crank arm is fixed to the output shaft of the motor, and the crank arm is connected to the second swing lever via the drive rod, whereby the second swing lever (second pivot shaft) is connected to the output shaft. ) Is transmitted to the first swing lever (first pivot shaft) by the connecting rod.

Also, there is a wiper device provided with a ball joint for connecting a rod (drive rod or connecting rod) for transmitting a driving force to a swing lever (for example, see Patent Document 2). The ball joint has a ball pin fixed to the swing lever and a joint case fixed to the rod. The ball pin has a base end portion that is caulked through the swing lever, a shaft portion standing on the swing lever, and a spherical portion provided at the tip of the shaft portion. The joint case has a spherical recess (mounting recess) that holds the spherical portion in a rollable manner.

Also, an example of the wiper device includes a motor, a connection frame to which the motor is fixed, and pivot holders fixed to both ends of the connection frame. The pivot holder is provided between a holder part that holds a pivot shaft to which the wiper is connected, a holder body fixing part that extends from the holder part and is fixed to the vehicle body, and the holder part and the holder body fixing part. (See, for example, Patent Document 3). In such a wiper device, for example, when an object collides with the tip end portion (base end portion of the wiper) of the pivot shaft and an external downward force (impact) is applied to the pivot shaft, the fragile portion breaks. Meanwhile, an integrated body composed of the pivot shaft, the holder portion, the connecting frame, the motor and the like is displaced (dropped) downward. Thereby, the impact (reaction force from the pivot shaft) applied to the object can be suppressed.

JP 2008-207701 A Japanese Patent No. 4142494 JP 2004-330895 A

However, in the wiper device described in Patent Document 1, since the connecting rod and the drive rod are connected to the tip of the second swing lever, the second swing lever becomes large (second pivot shaft). The area of the second rocking lever as viewed from the axial direction of the head is increased). This causes, for example, an increase in the material cost of the lever. Further, when the connecting rod and the drive rod are connected to one surface and the other surface of the second swing lever, the connecting rod and the driving rod are further increased in the axial direction of the second pivot shaft. As a result, the operating space is further increased, and there is a problem that it is difficult to secure a vehicle mounting space.

Further, in the wiper device having a ball joint as described in Patent Document 2, the shaft portion of the ball pin is erected on the swing lever in the plate thickness direction, and the plane of the swing lever and the driving force are input. The spherical portion is offset in the thickness direction. Therefore, when the driving force is transmitted between the swing lever and the drive rod, the swing lever is inclined with respect to the direction perpendicular to the thickness direction (that is, the direction along the plane of the swing lever). (That is, a force in a direction in which the ball pin is inclined) is applied. Therefore, it is necessary to increase the thickness of the rocking lever to ensure the rigidity of the rocking lever so as not to be deformed by the force in the inclined direction received from the shaft portion. This causes, for example, an increase in the material cost of the swing lever.

Further, in a wiper device having a weak part as described in Patent Document 3, a large unit consisting of a pivot shaft, a holder part, a connecting frame, a motor, and the like can be displaced downward on the vehicle side. There is a problem that a large arrangement space is required.

A first object of the present invention is to provide a wiper device capable of reducing the size of a swing lever.
A second object of the present invention is to provide a wiper device that can reduce the thickness of the swing lever.

A third object of the present invention is to provide a wiper device that can suppress an impact applied to a colliding object while reducing a space in which the wiper device is disposed.

In order to achieve the first object, a wiper device according to a first aspect of the present invention includes a first pivot shaft, a first swing lever, a second pivot shaft, and a second swing lever. A rod, a crank arm, and a drive rod are included. The first swing lever extends from the first pivot shaft in the radial direction of the first pivot shaft and rotates integrally with the first pivot shaft. The second swing lever extends from the second pivot shaft in the radial direction of the second pivot shaft and rotates integrally with the second pivot shaft. The connecting rod has a first end connected to the tip of the first swing lever and a second end connected to the tip of the second swing lever. The crank arm extends in the radial direction of the output shaft from the output shaft of the motor and rotates integrally with the output shaft. The drive rod has a first end connected to a tip portion of the crank arm and a second end connected to an intermediate portion of the connection rod.

In order to achieve the second object, a wiper device according to a second aspect of the present invention includes a pivot shaft, a swing lever, a connecting rod, and a ball joint. The swing lever extends from the pivot shaft in a direction perpendicular to the axial direction of the pivot shaft and rotates integrally with the pivot shaft. The connecting rod is provided to transmit a driving force to the tip of the swing lever. The ball joint is provided to connect the connecting rod to the tip of the swing lever. The rolling center of the ball joint is disposed within the thickness range of the swing lever.

To achieve the third object, a wiper device according to a third aspect of the present invention includes a motor, a connecting frame to which the motor is fixed, and a pivot holder. The pivot holder includes a holder portion, a connecting frame fixing portion, and a holder vehicle body fixing portion. The holder portion holds a pivot shaft having an upper end portion to which a wiper is connected. The connection frame fixing part extends from the holder part and is fixed to the connection frame. The holder vehicle body fixing portion extends from the holder portion and is fixed to the vehicle body. A fragile part is provided in the extending part between the holder part and the connecting frame fixing part.

1 is a partial perspective view of a vehicle according to a first embodiment of the present invention. FIG. 2 is an overall schematic diagram of the wiper device of FIG. FIG. 3 is a partial cross-sectional view illustrating a connected state of a first swing lever and a connecting rod in FIG. 2. FIG. 4 is a partial cross-sectional view for explaining the ball joint of FIG. 3. The schematic diagram for demonstrating the position of the connection rod of FIG. FIG. 6 is a partial cross-sectional view showing a connected state of a first rocking lever and a connecting rod in another example of the first embodiment. FIG. 6 is a partial cross-sectional view showing a connected state of a first rocking lever and a connecting rod in another example of the first embodiment. The perspective view of the wiper apparatus concerning 2nd Embodiment of this invention. The side view of the wiper apparatus of FIG. FIG. 10A is a sectional view taken along line AA in FIG. FIG. 10B is a sectional view taken along line BB in FIG. FIG. 10C is a sectional view taken along the line CC in FIG. The schematic diagram for demonstrating the effect | action of the wiper apparatus of FIG.

Hereinafter, an embodiment of a wiper device will be described with reference to FIGS.
As shown in FIG. 1, the vehicle includes a front window G and first and second wipers W1, W2 for wiping a wiping surface Ga on the outside of the passenger compartment of the front window G. 1 and 2 is for a left-hand drive vehicle, the first wiper W1 wipes the wiping surface Ga on the driver's seat side (right side in FIG. 1), and the second wiper W2 is the passenger seat. This is for wiping the wiping surface Ga on the side (left side in FIG. 1).

As shown in FIG. 2, the wiper device includes first and

second pivot holders

1 and 2 and a connecting frame 3 that connects them, with respect to a body (not shown) below the front window G (see FIG. 1). Fixed.

Further, the wiper device includes a first pivot shaft 4 rotatably supported with respect to the first pivot holder 1, and a first pivot shaft 4 extending in a radial direction (axial orthogonal direction) from a lower end of the first pivot shaft 4. A first swing lever 5 that rotates integrally with the pivot shaft 4 is provided. The second wiper W2 is fixed to the upper end portion of the first pivot shaft 4.

Further, the wiper device includes a second pivot shaft 6 rotatably supported with respect to the second pivot holder 2, and a second pivot shaft 6 extending in a radial direction (axial orthogonal direction) from a lower end of the second pivot shaft 6. A pivot lever 6 and a second swing lever 7 that rotates together with the pivot shaft 6 are provided. The first wiper W1 is fixed to the upper end portion of the second pivot shaft 6.

The wiper device further includes a connecting rod 8 having one end connected to the tip of the first swing lever 5 and the other end connected to the tip of the second swing lever 7. As shown in FIGS. 3 to 5, the connecting rod 8 is made of a solid (non-hollow) bar, and in the present embodiment, is made of a metal bar having a circular cross section.

The wiper device also includes a motor 9 fixed to the connection frame 3 and a crank arm 11 that extends in a radial direction (axial orthogonal direction) from the output shaft 10 of the motor 9 and rotates integrally with the output shaft 10. . In the present embodiment, the output shaft 10 of the motor 9 is disposed at a position closer to the first pivot shaft 4 than to the second pivot shaft 6.

The wiper device further includes a drive rod 12 having one end connected to the tip of the crank arm 11 and the other end connected to an intermediate portion of the connecting rod 8. In the present embodiment, the drive rod 12 is connected to a position closer to the second swing lever 7 than the first swing lever 5 in the connecting rod 8. Then, a straight line L1 connecting each connection point (each rolling center Z) between the first and second swing levers 5, 7 and the connecting rod 8, and each connection between the crank arm 11, the connecting rod 8, and the drive rod 12. The angle θ formed by the straight line L2 connecting the points (each rolling center) is set to an acute angle, and is preferably set to always be within a range of 45 degrees or less during the operation of the crank arm 11. Further, when the motor 9 is operated, that is, when the crank arm 11 is rotated, the crank arm 11 intersects (crosses) the connecting rod 8 when viewed from the axial direction of the output shaft 10. In other words, the connecting point X1 between the crank arm 11 and the drive rod 12 is close to the output shaft 10 with respect to the connecting rod 8 when viewed from the axial direction of the output shaft 10 when the crank arm 11 rotates (in FIG. It moves alternately between a state located at a position below (L1) and a state located at a position opposite to the position close to the output shaft 10 with respect to the connecting rod 8 (above the straight line L1 in FIG. 2). It is provided as follows.

The first rocking lever 5, the second rocking lever 7 and the drive rod 12 are all disposed above the connecting rod 8 (the tip ends of the first and second pivot shafts 4 and 6). The connecting rod 8 is connected.

Specifically, the first rocking lever 5 and the connecting rod 8, the second rocking lever 7 and the connecting rod 8, and the drive rod 12 and the connecting rod 8 are connected via a ball joint 21, respectively.

As shown in FIGS. 3 and 4, the ball joint 21 includes a ball pin 22 fixed to the connecting rod 8, a joint case 23 fixed to the first swing lever 5, and a dustproof / waterproof cover 24. . Since the ball joints 21 are similar to each other, only the ball joint 21 that connects the first swing lever 5 and the connecting rod 8 will be described in detail, and the description of the other ball joints 21 will be omitted.

The ball pin 22 includes a fixing portion 22b in which a fixing hole 22a is formed through which the connecting rod 8 is fixed, a shaft portion 22c extending from the fixing portion 22b in a direction perpendicular to the penetration direction of the fixing hole 22a, and a shaft portion. And a spherical portion 22d provided at the tip of 22c. That is, the ball pin 22 extends from the connecting rod 8 in a direction orthogonal to the longitudinal direction of the connecting rod 8 and has a spherical portion 22d at the tip. The ball pin 22 is provided in such a manner that the connecting rod 8 is embedded in the ball pin 22. The outer surface of the spherical portion 22d is formed in a shape obtained by partially removing the upper and lower parts of the sphere.

The joint case 23 has a spherical concave portion 23a that holds the spherical portion 22d in a rollable manner. The joint case 23 further includes a cap part 23c and an opening part 23d. The cap part 23c has a cap shape that covers the upper part of the spherical part 22d. The first and

second pivot shafts

4 and 6 extend from the first and second swing levers 5 and 7 toward the first side. The cap portion 23 c has a cap shape that is located on the first side with respect to the first and second swing levers 5 and 7 and covers the first side portion of the first and second swing levers 5 and 7. is doing. The opening 23 d is located at the lower part of the joint case 23. The opening 23d is located on the second side opposite to the first side with respect to the first and second swing levers 5 and 7. In addition, the joint case 23 has an annular groove 23b on the outside of which the inner edge of the mounting hole 5a formed in the first swing lever 5 is fitted.

The dustproof / waterproof cover 24 includes a fixed annular portion 24a fitted on the shaft portion 22c and a thin-walled closed portion 24b provided so as to close an opening below the joint case 23. The closing portion 24b is flexible and closes the opening below the joint case 23 even when the ball joint 21 rolls (specifically, even when the spherical portion 22d slides relative to the spherical concave portion 23a). It is elastically deformed so as to maintain the state.

Further, in the ball joint 21 of the present embodiment, the rolling center (that is, the center of the spherical portion 22d) Z is within the range Y of the plate thickness of the first swing lever 5, and the center position within the range Y is It is arranged and provided.

Further, as shown in FIG. 2, the rolling centers Z of all (three) ball joints 21 are arranged on a straight line. In other words, the rolling center Z of the ball joint 21 that connects the drive rod 12 and the connecting rod 8 is the rolling center Z of the ball joint 21 that connects the first swing lever 5 and the connecting rod 8 and the second. It is arranged on a straight line L1 connecting the rolling center Z of the ball joint 21 that connects the swing lever 7 and the connecting rod 8.

Further, as schematically shown in FIG. 5, the connecting rod 8 passes between the motor 9 and the operating area of the crank arm 11 (between the directions along the axial direction of the output shaft 10). Is provided. The “operation area of the crank arm 11” means an operation area occupied by the crank arm 11 when the crank arm 11 rotates around the axis of the output shaft 10. Specifically, the connecting rod 8 of the present embodiment moves substantially along the longitudinal direction of the connecting rod 8 (the direction orthogonal to the plane of FIG. 5) during operation of the motor 9, and the direction orthogonal to the output shaft 10 (left and right in FIG. 5). Move in the direction). When the connecting rod 8 moves, at least when the connecting rod 8 approaches the output shaft 10 at least, at least a part of the connecting rod 8 passes between the motor 9 and the operating area of the crank arm 11. Yes.

Next, the operation of the wiper device of the first embodiment will be described.
For example, when a washer switch provided in the driver's seat is operated, a drive current is supplied to the motor 9 and the output shaft 10 and the crank arm 11 are rotationally driven. Then, the power is transmitted to the first and second swing levers 5 and 7 through the drive rod 12 and the connecting rod 8, and the first and second swing levers 5 and 7 swing back and forth to form the first. And the

second pivot shafts

4 and 6 are rotated, and the first and second wipers W1 and W2 fixed to the first and

second pivot shafts

4 and 6 are reciprocally swung synchronously to perform a wiping operation. .

Next, the characteristic advantages of the above embodiment will be described below.
(1) The drive rod 12 has one end connected to the tip of the crank arm 11 and the other end connected to an intermediate portion of the connecting rod 8 that connects the first swing lever 5 and the second swing lever 7. And have. Therefore, for example, the second rocking lever 7 can be downsized as compared with the configuration in which the other end of the drive rod 12 is connected to the tip of the second rocking lever 7. That is, in the configuration in which the connecting rod 8 and the drive rod 12 are connected to the tip of the second swing lever 7 via the ball joints 21, the area of the second swing lever 7 is secured in order to secure a space for connection. Need to be larger. In contrast, in the present embodiment, the drive rod 12 is not connected to the tip of the second swing lever 7 (since only the connecting rod 8 needs to be connected), the second swing lever 7 can be downsized (second). It is possible to reduce the area of the pivot shaft 6 as viewed from the axial direction. As a result, for example, the material cost of the second swing lever 7 can be reduced. Further, for example, the length of the drive rod 12 can be shortened as compared with the configuration in which the other end of the drive rod 12 is connected to the tip of the second swing lever 7. Furthermore, since both the first rocking lever 5 and the second rocking lever 7 are provided with only one ball joint 21 (more specifically, only one joint case 23 is provided) The first rocking lever 5 and the second rocking lever 7 can be configured as a common lever shape. Compared with the case where the connecting rod 8 and the drive rod 12 are connected to one surface and the other surface of the second swing lever 7, the working space in the axial direction (vertical direction) of the second pivot shaft 6 is larger. This makes it easier to secure a mounting space on the vehicle.

(2) The first rocking lever 5, the second rocking lever 7 and the drive rod 12 are all disposed above the connecting rod 8 (the tip side of the first and second pivot shafts 4 and 6). It is connected to the connecting rod 8. Therefore, the thickness (dimension) in the vertical direction of the wiper device can be reduced. That is, in the configuration in which any one of the first rocking lever 5, the second rocking lever 7, and the drive rod 12 is disposed on the opposite side of the connecting rod 8 in the vertical direction and connected to the connecting rod 8, the opposite side The thickness (dimension) in the vertical direction of the member arranged in the upper part is added to increase the vertical thickness (dimension) of the wiper device, but this can be avoided to reduce the vertical thickness (dimension). it can.

(3) The first rocking lever 5 and the connecting rod 8, the second rocking lever 7 and the connecting rod 8, and the drive rod 12 and the connecting rod 8 are connected via the ball joints 21, respectively. The rolling center Z of 21 is arrange | positioned on a straight line (L1). Therefore, it is possible to operate well without causing a twisting movement during driving. For example, the connecting rod 8 and the first swing lever 5 and the connecting rod 8 and the second swing lever 7 are connected to the connecting rod 8 on one side in the vertical direction, and the drive rod 12 and the connecting rod 8 are connected to the connecting rod. Consider a case in which 8 is connected on the other side in the vertical direction. In this case, the oscillating thrust from the drive rod 12 is a connection point between the connecting rod 8 and the first oscillating lever 5 (each rolling center Z) and a connecting point between the connecting rod 8 and the second oscillating lever 7 ( The connecting rod 8 swings about a straight line L1 connecting the rolling centers Z) as a rotation axis. According to the said structure, such rocking | fluctuation can be prevented or suppressed.

(4) The output shaft 10 of the motor 9 is disposed at a position closer to the first pivot shaft 4 than the second pivot shaft 6, and the drive rod 12 has a second swing relative to the first swing lever 5 in the connecting rod 8. It is connected to a position close to the moving lever 7. Therefore, the motor 9, the drive rod 12, etc. can be satisfactorily arranged between the first pivot shaft 4 and the second pivot shaft 6 (in the vehicle width direction). Also, straight lines L1 connecting the connection points (the respective rolling centers Z) of the first and second swing levers 5 and 7 and the connecting rod 8, and the connections of the crank arm 11, the connecting rod 8, and the drive rod 12. The angle θ formed by the straight line L2 connecting the points (each rolling center) is set to be an acute angle. Preferably, the angle θ is set to be always within a range of 45 degrees or less during operation of the crank arm 11. Therefore, the swinging thrust from the drive rod 12 can be efficiently transmitted as a force along the connecting rod 8.

(5) The crank arm 11 has a state of intersecting the connecting rod 8 (crossing the connecting rod 8) when viewed from the axial direction of the output shaft 10 when the motor 9 is operated, that is, when the crank arm 11 is rotated. It is configured. Therefore, for example, compared to a configuration in which the crank arm 11 does not intersect the connecting rod 8 during operation of the motor 9, the operating space (that is, the vehicle mounting space) viewed from the axial direction of the output shaft 10 is reduced. be able to.

(6) Since the connecting rod 8 has a state of passing between the operating area of the motor 9 and the crank arm 11 (between the directions along the axial direction of the output shaft 10) during the operation of the motor 9, for example, Compared to the configuration in which the motor 9 and the crank arm 11 are not passed, the operating space (that is, the vehicle mounting space) viewed from the axial direction of the output shaft 10 can be reduced.

(7) The connecting rod 8 is made of a solid (non-hollow) rod. Therefore, it can be made thin while ensuring strength as compared with a non-solid (hollow) pipe material. For example, consider a case where the wiper device is configured such that the connecting rod 8 has a state of passing between the motor 9 and the crank arm 11 as in the present embodiment. In this case, the distance between the motor 9 and the crank arm 11 can be further reduced as compared with the connecting rod made of pipe material, and the axial direction (vertical direction) of the output shaft 10 of the wiper device can be reduced. Can do.

(8) The connecting point between the crank arm 11 and the drive rod 12 is a position closer to the output shaft 10 with respect to the connecting rod 8 when viewed from the axial direction of the output shaft 10 when the crank arm 11 rotates. In contrast, the position closer to the output shaft 10 and the opposite position are provided so as to move alternately. Therefore, for example, the working space viewed from the axial direction of the output shaft 10 can be reduced as compared with a configuration that does not move alternately. That is, it is necessary to arrange each component so that the connecting rod 8 is always located outside the operation area of the crank arm 11 so that the connecting rod 8 does not interfere with the crank arm 11 when the crank arm 11 rotates. Absent.

(9) The rolling center Z of the ball joint 21 is disposed within the thickness range Y of the first and second swing levers 5 and 7. Therefore, when a driving force is transmitted between the first and second swing levers 5 and 7 and the connecting rod 8, the first and second swing levers 5 and 7 are orthogonal to the plate thickness direction. It can prevent or suppress that the force of the direction inclined with respect to is added. As a result, it is difficult to apply a deformation force to the first and second swing levers 5 and 7, and it is possible to ensure rigidity even if the plate thickness of the first and second swing levers 5 and 7 is reduced. Become. As a result, for example, the material cost of the first and second swing levers 5 and 7 can be reduced. In addition, this can prevent a force from tilting the

shafts

4 and 6 from acting on the first and

second pivot shafts

4 and 6 that rotate integrally with the first and second swing levers 5 and 7, respectively.

Further, in the conventional wiper device, when the shaft portion of the ball pin is caulked and fixed to the first and second swing levers, the shaft portion is slightly inclined from the direction orthogonal to the first and second swing levers. was there. For this reason, the distance between the axis of the first and

second pivot shafts

4 and 6 and the rolling center Z changes, and the variation in the swing angle range of the first and second swing levers increases. As a result, the swing angle range of the wiper may be likely to vary. According to the present invention, it is possible to avoid variation in the swing angle range of the wiper due to such a reason.

(10) The ball joint 21 has its rolling center Z located at the center position within the thickness range Y of the first and second swing levers 5 and 7. Therefore, it becomes more difficult for the first and second swing levers 5 and 7 to be subjected to a force for deforming the first and second swing levers 5 and 7, and consequently the plates of the first and second swing levers 5 and 7. It becomes possible to make the thickness thinner.

(11) The ball joint 21 has a ball pin 22 provided on the connecting rod 8 and a joint case 23 provided on the first and second swing levers 5, 7. The ball pin 22 has a portion where the connecting rod 8 is embedded and a spherical portion 22d. The spherical portion 22d is accommodated in the joint case 23 so as to be able to roll. The first and

second pivot shafts

4 and 6 extend from the first and second swing levers 5 and 7 toward the first side. The joint case 23 has a cap part 23c and an opening part 23d. The cap part 23 c is located on the first side with respect to the first and second swing levers 5 and 7 and has a cap shape that covers the first side portion of the first and second swing levers 5 and 7. Have. The opening 23d is located on the second side opposite to the first side with respect to the first and second swing levers 5 and 7. The spherical portion 22d is accommodated in the joint case 23 through the opening 23d. Therefore, for example, even if raindrops or the like enter the wiper device from above the wiper device (the first side portion in the wiper device) and reach the ball joint 21, they are prevented or suppressed from entering the joint case 23. Is done.

The first embodiment may be modified as follows.
In the above embodiment, the first rocking lever 5, the second rocking lever 7, and the drive rod 12 are all disposed above the connecting rod 8 (the tip side of the first and second pivot shafts 4 and 6). The connecting rod 8 is connected, but the present invention is not limited to this, and the connecting rod 8 may be connected in another arrangement.

For example, as shown in FIG. 6, the first rocking lever 5 may be disposed below the connecting rod 8 and connected to the connecting rod 8. In this case, the second rocking lever 7 and the drive rod 12 may be arranged below the connecting rod 8 so as to be connected to the connecting rod 8.

Further, for example, any one of the first rocking lever 5, the second rocking lever 7, and the drive rod 12 is arranged on the opposite side of the connecting rod 8 in the vertical direction so as to be connected to the connecting rod 8. May be.

In the above embodiment, the ball pin 22 in the ball joint 21 has the fixing portion 22b formed with the fixing hole 22a through which the connecting rod 8 is fixed, but the ball pin 22 having the spherical portion 22d You may connect with the connection rod 8 by another structure.

For example, as shown in FIG. 7, the bent end portion of the connecting rod 8 may be fixed to the shaft portion 22 c of the ball pin 22 (by welding or press fitting).
In the above embodiment, the first swing lever 5 and the connecting rod 8, the second swing lever 7 and the connecting rod 8, and the drive rod 12 and the connecting rod 8 are connected via the same ball joint 21. However, the present invention is not limited to this, and may be connected via a joint having another configuration.

In the above embodiment, the first swing lever 5 and the connecting rod 8, the second swing lever 7 and the connecting rod 8, and the drive rod 12 and the connecting rod 8 are connected via the ball joints 21, respectively. Although the rolling center Z of the ball joint 21 is arranged on a straight line, the present invention is not limited to this and may be changed to a configuration not arranged on the straight line.

In the above embodiment, the ball joint 21 has its rolling center Z disposed within the thickness range Y of the first and second swing levers 5 and 7, but is not limited thereto. The rolling center may be arranged outside the thickness range Y of the first and second swing levers 5 and 7. For example, contrary to the above embodiment, the ball pin 22 may be fixed to the first and second swing levers 5 and 7, and the joint case 23 may be fixed to the connecting rod 8.

In the above embodiment, the crank arm 11 is configured to have a state of intersecting the connecting rod 8 when viewed from the axial direction of the output shaft 10 when the motor 9 is operating, that is, when the crank arm 11 is rotating. However, the present invention is not limited to this, and it may be provided so as not to intersect at the time of rotation.

In the above embodiment, the connecting rod 8 is provided so as to pass between the motor 9 and the crank arm 11 (between the directions along the axial direction of the output shaft 10) during operation of the motor 9. However, the present invention is not limited to this, and it may be provided so as not to pass between the motor 9 and the crank arm 11 (does not pass during driving).

In the above embodiment, the connecting rod 8 is a solid (non-hollow) bar and is made of a metal bar having a circular cross section. However, the present invention is not limited to this, and the connecting rod 8 may be changed to another shape. Good. For example, the connecting rod 8 may be a solid (non-hollow) bar, and may be made of a metal bar having a substantially circular cross section and a large number of irregularities on the outer periphery. For example, the connecting rod 8 may be made of a non-solid (hollow) pipe material.

In the above embodiment, the ball joint 21 that connects the first swing lever 5 and the connecting rod 8 and the second swing lever 7 and the connecting rod 8 has a rolling center Z that is the first and second. The rocking levers 5 and 7 are disposed within the thickness range Y. However, if at least one pair (for example, the pair of the first rocking lever 5 and the connecting rod 8) is disposed as described above, The configuration may be changed.

In the above embodiment, the ball joint 21 has the rolling center Z disposed at the center position within the range Y of the plate thickness of the first and second swing levers 5 and 7, but is not limited thereto. Instead, it may be arranged at a position shifted from the center position within the thickness range Y.

In the above embodiment, the drive rod 12 having one end connected to the tip of the crank arm 11 is connected to the intermediate portion of the connecting rod 8 that connects the first swing lever 5 and the second swing lever 7 at the other end. Although connected, it is not limited to this, For example, it is good also as a structure by which the other end of the drive rod 12 is connected with the front-end | tip part of the 2nd rocking lever 7. FIG.

Hereinafter, a second embodiment of the wiper device will be described with reference to FIGS.
As shown in FIG. 8, the wiper device U includes two pivot holders 111, a connection frame 112 as a connection frame, a motor M, a connection rod R1, and a drive rod R2.

The connecting frame 112 has a C-shaped cross section perpendicular to the longitudinal direction. Specifically, the cross-sectional shape of the connecting frame 112 is formed in a C shape by a pair of facing surfaces facing the axis A1 direction of the pivot shaft 113 and a back plate surface connecting the pair of facing surfaces. Pivot holders 111 are fixed to both ends of the connecting frame 112 in the longitudinal direction, and a motor M is fixed to an intermediate portion in the longitudinal direction. Each pivot holder 111 includes a substantially cylindrical holder portion 111a that rotatably holds a pivot shaft 113 having an upper end portion to which the wiper W is connected, and a radially outer portion from a part of the outer peripheral portion of the holder portion 111a. The holder body fixing portion 111b extends, and a frame fixing portion 111c as a connecting frame fixing portion that is a part of the outer periphery of the holder portion 111a and extends from the opposite side of the holder body fixing portion 111b. The holder body fixing portion 111b has a fixing hole that penetrates in a direction along the axis A1 direction of the pivot shaft 113, and a rubber bush 114 is attached and fixed to the fixing hole. The holder vehicle body fixing portion 111b is fixed to the vehicle body by a rubber bush 114 and a bolt passing through the fixing hole. In addition, each frame fixing portion 111 c extends along the longitudinal direction of the connection frame 112. As shown in FIG. 9, a positioning protrusion 111 d that is fitted into the positioning hole 112 a of the connection frame 112 is provided at the tip of each frame fixing portion 111 c. The frame fixing portion 111c is connected to the connecting frame by screws 115 that pass through the back plate surface of the connecting frame 112 with the positioning protrusions 111d inserted into the positioning holes 112a and are screwed to the base end portion of the frame fixing portion 111c. 112 is fixed. Further, on each pivot shaft 113, a swing lever 113a extending in a direction perpendicular to the axis is fixed to a lower end portion protruding from the lower end of the holder portion 111a.

The motor M includes a motor main body 121 and a speed reduction unit 122. The motor main body 121 rotationally drives a rotor (not shown) inside the motor main body 121 by supplying a drive current from an external power source. The speed reduction unit 122 includes a gear housing 123 fixed to the motor main body 121, a speed reduction mechanism such as a worm speed reduction gear (not shown) that is provided inside the gear housing 123 and decelerates the rotation of the rotor, and a gear connected to the speed reduction mechanism. And an output shaft 124 protruding from the housing 123. A proximal end portion of a flat crank arm 125 is fixed to the distal end portion of the output shaft 124. Note that the axis A2 (see FIG. 9) of the output shaft 124 extends in a direction substantially parallel to the axis A1 of the pivot shaft 113. In this embodiment, the direction in which the output shaft 124 and the pivot shaft 113 project is upward. .

The gear housing 123 has a side surface that faces in a direction orthogonal to the axis A2 of the output shaft 124 and in a direction orthogonal to the axis A3 of the rotor of the motor body 121. A pair of mounting legs 123 a (see FIG. 8) is provided on this side surface of the gear housing 123. In other words, the pair of mounting legs 123a is provided at a position opposite to the position where the worm is disposed in the worm reduction gear housed in the gear housing 123. The gear housing 123 is fastened and fixed to the connection frame 112 by screwing a bolt 126 (see FIG. 9) penetrating the connection frame 112 and a nut held by the mounting leg 123a.

One end of the connecting rod R1 is connected to the tip of the swing lever 113a on the one side (driver seat side, right side in FIG. 8), and the other end (on the passenger seat side, in FIG. 8). , And the left side) is connected to the tip of the swing lever 113a.

The drive rod R2 has one end connected to the tip of the crank arm 125, and the other end connected to one swing lever 113a (the right swing lever 113a in FIG. The two swing levers 113a are connected to a portion near the swing lever 113a) far from the motor M. Specifically, as shown in FIG. 8, the other end of the drive rod R2 is connected to a portion near the right swing lever 113a in the intermediate portion of the connecting rod R1 (that is, the two swing levers 113a are connected to each other). (It is connected to a portion near the swing lever 113a far from the motor M). Each end of the connecting rod R1 and the driving rod R2 is drivingly connected to another member via a ball joint.

Here, a fragile portion 111f is provided in the extending portion 111e between the holder portion 111a and the frame fixing portion 111c in the pivot holder 111 of the present embodiment. In the present embodiment, one (right side in FIG. 8) and the other (left side in FIG. 8) pivot holder 111 are slightly different in size and shape, but one (right side in FIG. 8) pivot holder 111 is different. The other (left side in FIG. 8) pivot holder 111 will be described in detail with the same reference numerals assigned to parts having similar functions, and detailed description thereof will be omitted.

Specifically, the pivot holder 111 is an integrally molded product made of a metal material (for example, a die-cast molded part such as an aluminum alloy). In the pivot holder 111, an extending portion 111e provided between the holder portion 111a and the frame fixing portion 111c and connecting them is a side extending from the holder portion 111a along a direction orthogonal to the axis A1 of the pivot shaft 113. A side extending portion 111g and a vertically extending portion 111h that extends downward from the tip of the side extending portion 111g and is connected to the frame fixing portion 111c. And the whole side extension part 111g comprises the weak part 111f.

That is, as shown in FIG. 10A, the vehicle body side extending portion 111j provided between the holder portion 111a and the holder vehicle body fixing portion 111b is connected in a direction perpendicular to the axis A1 of the pivot shaft 113. The cross-sectional shape that extends along the direction perpendicular to the longitudinal direction is an L-shaped cross-sectional shape. In addition, in this embodiment, the vehicle body side extending part 111j has a rib 111k that protrudes in a direction perpendicular to the width direction (downward in the present embodiment) from the end in the width direction of the plate-like part serving as a base. It is L-shaped cross-sectional shape. The rib 111k is an end portion in the width direction farther from the swing range B (see FIG. 8) of the swing lever 113a (the swing lever) of the two end portions in the width direction of the vehicle body side extending portion 111j. 113a in the width direction far from the tip of 113a.

Further, as shown in FIG. 10 (b), the vertical extending portion 111h has an L-shaped cross-sectional shape that is perpendicular to the longitudinal direction (vertical direction). In the present embodiment, the vertically extending portion 111h further protrudes in the width direction from the end portion in the width direction of the plate-like portion serving as the base, and is orthogonal to the width direction (in this embodiment, the side extending portion 111g). By having a rib 111m protruding on the base end side, an L-shaped cross section is formed. Further, the rib 111m has a width direction end portion (swing lever) which is far from the swing range B (see FIG. 8) of the swing lever 113a, of the two end portions in the width direction of the vertically extending portion 111h. 113a in the width direction far from the tip of 113a.

And as shown in FIG.10 (c), as for the said side extension part 111g, the cross-sectional shape orthogonal to the longitudinal direction maintained the rectangular cross-sectional shape (namely, the shape of the plate-shaped part used as a base). In other words, the fragile portion 111f is relatively weaker than the vehicle body side extending portion 111j or the vertically extending portion 111h having the L-shaped cross section. In other words, the vehicle body side extending portion 111j and the vertically extending portion 111h having an L-shaped cross-sectional shape are formed as relatively high-strength portions than the side extending portion 111g that remains a plate-like portion serving as a base. Yes.

Next, the operation of the wiper device U of the second embodiment will be described.
For example, when a wiper switch provided in the driver's seat is operated, a drive current is supplied to the motor main body 121, and the output shaft 124 and the crank arm 125 are rotationally driven. Then, the power is transmitted to each swing lever 113a via the connecting rod R1 and the drive rod R2, and each pivot shaft 113 is reciprocally rotated by reciprocally swinging each swing lever 113a. The wiper W fixed on the back and forth rocks in synchronism and performs a wiping operation.

Then, as shown in FIG. 11, for example, when an external downward force is applied to the pivot shaft 113 (base end portion of the wiper W) due to a collision of an object during traveling of the vehicle, the fragile portion 111f is broken, The pivot shaft 113 and the holder portion 111a rotate about the holder body fixing portion 111b, and the pivot shaft 113 and the holder portion 111a are displaced downward. Therefore, the impact applied to the collided object is absorbed and suppressed.

Next, characteristic advantages of the second embodiment will be described below.
(12) In the extending portion 111e between the holder portion 111a and the frame fixing portion 111c in the pivot holder 111, a fragile portion 111f is provided. Therefore, for example, when an axial downward force is applied to the pivot shaft 113 due to some object collision, the fragile portion 111f is broken and the pivot shaft 113 and the holder are broken even if there is no space below the motor M or the connecting frame 112. The portion 111a can be displaced downward. Therefore, as shown in FIG. 11, the impact on the object can be suppressed while the space where the wiper device is disposed is reduced (even though the space is shallow at the bottom).

In particular, the pivot holder 111 has a vertically extending portion 111h. Therefore, when the connection frame 112 and the frame fixing portion 111c are fixed at a position below the pivot shaft 113 (vehicle inward position), the motor M as a heavy object fixed to the connection frame 112 is also positioned below. Can be arranged. Moreover, when the gap between the holder portion 111a and the holder body fixing portion 111b is broken as in the prior art, the vertically extending portion 111h hinders the downward displacement of the pivot shaft 113. On the other hand, in the above embodiment, since the weakened portion 111f of the extending portion 111e between the holder portion 111a and the frame fixing portion 111c is broken, as shown in FIG. 11, the holder body portion 111a using the holder body fixing portion 111b as a fulcrum. At the same time, the pivot shaft 113 can be displaced downward.

(13) The extending portion 111e includes a side extending portion 111g extending from the holder portion 111a on the side opposite to the vehicle body side extending portion 111j along a direction orthogonal to the axis A1 of the pivot shaft 113, and a side extending portion. It has a vertically extending portion 111h that extends downward from the tip of the portion 111g and is connected to the frame fixing portion 111c. The weak part 111f is provided in the side extension part 111g. Therefore, for example, it is easy to secure a large space below the fragile portion 111f, and as a result, it is easy to secure a large amount of downward displacement of the pivot shaft 113 and the holder portion 111a. If an axial downward force is applied to the pivot shaft 113 due to some object collision, the fragile portion 111f is broken and the pivot shaft 113 and the holder portion 111a are displaced downward while rotating around the holder body fixing portion 111b. . In this case, the amount of downward displacement of the pivot shaft 113 and the holder portion 111a can be increased when the fragile portion 111f is located as high as possible. In the above configuration, the fragile portion 111f is provided in the laterally extending portion 111g extending from the holder portion 111a along the direction orthogonal to the axis A1 of the pivot shaft 113. For example, when the extending portion extends obliquely, that is, when the extending portion extends linearly toward the lower connecting frame 112, the fragile portion 111f is compared to the case where the fragile portion is provided in the middle. The position of can be made high. Thereby, the downward displacement amount of the pivot shaft 113 and the holder portion 111a can be increased.

(14) The vehicle body side extending portion 111j and the vertical extending portion 111h between the holder portion 111a and the holder vehicle body fixing portion 111b have an L-shaped cross-sectional shape. Therefore, the rigidity of the vehicle body side extending portion 111j and the vertically extending portion 111h can be increased, and the fragile portion 111f (side extending portion 111g) has a simple plate shape with a rectangular cross section as in this embodiment. can do. Thereby, the weak part 111f which is relatively weak compared with the vehicle body side extension part 111j and the up-down direction extension part 111h of L-shaped cross-section can be comprised. In other words, the vehicle body side extending portion 111j and the vertically extending portion 111h having an L-shaped cross-section are made to be relatively high-strength portions than the side extending portion 111g that is a plate-like portion serving as a base. it can.

(15) At the lower end of the pivot shaft 113, a swing lever 113a is provided. The vertically extending portion 111h has an L-shaped cross section by having a rib 111m extending to the base end side of the side extending portion 111g. The rib 111m is provided at the end in the width direction far from the swing range B of the swing lever 113a, out of the two ends in the width direction of the vertically extending portion 111h. Therefore, it is possible to prevent the rib 111m from narrowing the swing range B of the swing lever 113a while increasing the rigidity of the vertically extending portion 111h.

(16) A swing lever 113a is provided at the lower end of the pivot shaft 113. The vehicle body side extending portion 111j has an L-shaped cross section by having a rib 111k extending downward. The rib 111k is provided at the end in the width direction far from the swing range B of the swing lever 113a, out of the two ends in the width direction of the vehicle body side extending portion 111j. Therefore, it is possible to prevent the rib 111k from narrowing the swing range B of the swing lever 113a while increasing the rigidity of the vehicle body side extending portion 111j.

(17) A rubber bush 114 is fixed to the holder body fixing portion 111b. The holder vehicle body fixing portion 111b is fixed to the vehicle body via the rubber bush 114. Therefore, propagation of vibration is suppressed between the wiper device U and the vehicle body. Further, when an external downward force is applied to the pivot shaft 113 due to some object collision, if the fragile portion 111f is broken, the rubber bush 114 is elastically deformed and crushed, whereby the pivot shaft 113 and the holder portion 111a are fixed to the holder body. It is allowed to easily rotate around the portion 111b, and the pivot shaft 113 and the holder portion 111a can be displaced downward. Therefore, it is possible to suppress the impact applied to the object, including absorbing the impact when the rubber bush 114 is elastically deformed.

The second embodiment may be modified as follows.
In the above embodiment, the extending part 111e between the holder part 111a and the frame fixing part 111c has a side extending part 111g and a vertically extending part 111h, and the weak part 111f extends sideways. Although it is provided in the portion 111g, the shape of the extending portion 111e may be changed to another shape. In that case, of course, the position of the fragile portion 111f may be changed to another position of the extending portion. .

In the above embodiment, the vehicle body side extending portion 111j and the vertical extending portion 111h are L-shaped cross-sectional shapes, but if the shape has relatively higher rigidity than the fragile portion 111f, You may change into another cross-sectional shape. If the rib 111m does not affect the swing range B of the swing lever 113a, the width of the two ends in the width direction of the vertically extending portion 111h is close to the swing range B of the swing lever 113a. It may be provided at the end. Similarly, the rib 111k may be provided at the end in the width direction close to the swing range B of the swing lever 113a, out of the two ends in the width direction of the vehicle body side extending portion 111j.

In the above embodiment, the holder vehicle body fixing portion 111b is fixed to the vehicle body via the rubber bush 114. However, when the fragile portion 111f is broken, the pivot shaft 113 and the holder portion 111a are displaced downward. If it can accept | permit, the holder vehicle body fixing | fixed part 111b and the vehicle body side extension part 111j may be changed into another structure.

In the above embodiment, the connecting frame 112 has a C-shaped cross section orthogonal to the longitudinal direction, but is not limited thereto, and may be, for example, a hollow pipe shape or other cross sectional shapes. It is good also as a connection frame.

Claims

A first pivot shaft;
A first swing lever that extends from the first pivot shaft in a radial direction of the first pivot shaft and rotates integrally with the first pivot shaft;
A second pivot axis;
A second swinging lever extending from the second pivot shaft in the radial direction of the second pivot shaft and rotating integrally with the second pivot shaft;
A connecting rod having a first end connected to the tip of the first swing lever and a second end connected to the tip of the second swing lever;
A crank arm extending in a radial direction of the output shaft from the output shaft of the motor and rotating integrally with the output shaft;
A wiper device comprising: a drive rod having a first end connected to a tip end portion of the crank arm and a second end connected to an intermediate portion of the connecting rod.
The wiper device according to claim 1,
The wiper device in which the first swing lever, the second swing lever, and the drive rod are all arranged on one side of the connecting rod in the vertical direction and are connected to the connecting rod.
The wiper device according to claim 1 or 2,
The first swing lever and the connecting rod, the second swing lever and the connecting rod, and the drive rod and the connecting rod are respectively connected via a ball joint,
A wiper device in which the rolling centers of all ball joints are arranged in a straight line.
The wiper device according to any one of claims 1 to 3,
An output shaft of the motor is disposed closer to the first pivot shaft than the second pivot shaft;
The wiper device, wherein the drive rod is connected to a position closer to the second swing lever than the first swing lever in the connecting rod.
The wiper device according to any one of claims 1 to 4,
The wiper device, wherein the crank arm intersects the connecting rod when viewed from the axial direction of the output shaft during operation of the motor.
The wiper device according to any one of claims 1 to 5,
The connecting rod is a wiper device that passes between the motor and an operating area of the crank arm during operation of the motor.
The wiper device according to any one of claims 1 to 6,
The connecting rod is a wiper device made of a solid bar.
The wiper device according to any one of claims 1 to 7,
At least one of the first swing lever and the second swing lever and the connecting rod are connected via a ball joint,
The ball joint is a wiper device in which a rolling center is disposed within a thickness range of the first swing lever and the second swing lever.
The wiper device according to any one of claims 1 to 8,
The connecting point between the crank arm and the drive rod is a position closer to the output shaft with respect to the connecting rod and the connecting rod when viewed from the axial direction of the output shaft when the crank arm rotates. A wiper device provided to alternately move between a position near the output shaft and a position on the opposite side.
A pivot axis,
A swing lever that extends from the pivot shaft in a direction orthogonal to the axial direction of the pivot shaft and rotates integrally with the pivot shaft;
A connecting rod for transmitting a driving force to the tip of the swing lever;
A ball joint for connecting the connecting rod to the tip of the swing lever;
A wiper device comprising:
A wiper device in which a rolling center of the ball joint is disposed within a thickness range of the swing lever.
The wiper device according to claim 10,
A wiper device in which a rolling center of the ball joint is arranged at a center position within a range of a plate thickness of the swing lever.
The wiper device according to claim 10 or 11,
The ball joint has a ball pin provided on the connecting rod and a joint case provided on the swing lever;
The ball pin has a portion where the connecting rod is embedded and a spherical portion,
The spherical portion is accommodated in the joint case so as to be rollable,
The pivot shaft extends from the swing lever toward the first side,
The joint case has a cap part and an opening part,
The cap portion has a cap shape that is located on the first side with respect to the swing lever and covers a first side portion of the swing lever;
The wiper device is located on a second side opposite to the first side with respect to the swing lever.
The wiper device according to claim 10 or 11,
The ball joint has a spherical portion provided on the connecting rod, and a joint case provided on the swing lever,
A wiper device in which a spherical center of the spherical portion is the rolling center.
A motor,
A connecting frame to which the motor is fixed;
A pivot holder,
A holder portion for holding a pivot shaft having an upper end to which the wiper is connected;
A connection frame fixing part extending from the holder part and fixed to the connection frame;
A holder body fixing portion that extends from the holder portion and is fixed to the vehicle body,
The pivot holder;
A wiper device comprising:
The wiper apparatus in which the weak part is provided in the extension part between the said holder part and the said connection frame fixing | fixed part.
The wiper device according to claim 14,
The extending portion extends from the holder portion along a direction orthogonal to the axis of the pivot shaft, and extends downward from the tip of the side extending portion to connect to the connecting frame fixing portion. And a vertically extending portion that is
The weak part is a wiper device provided in the side extension part.
The wiper device according to claim 15,
A vehicle body side extending part is provided between the holder part and the holder body fixing part,
Each of the said vehicle body side extension part and the said up-down direction extension part is a wiper apparatus which has L-shaped cross-sectional shape.
The wiper device according to claim 15 or 16,
At the lower end of the pivot shaft, a swing lever that can rotate integrally with the pivot shaft and can input and output power is provided.
The vertically extending portion has an L-shaped cross-section by having a rib extending to the base end side of the side extending portion,
The said rib is a wiper apparatus provided in the edge part of the width direction far from the rocking | fluctuation range of the said rocking lever among the two edge parts of the width direction of the said up-down direction extension part.
The wiper device according to any one of claims 14 to 16,
At the lower end of the pivot shaft, a swing lever that can rotate integrally with the pivot shaft and can input and output power is provided.
A vehicle body side extending part is provided between the holder part and the holder body fixing part,
The vehicle body side extending portion has an L-shaped cross section by having a rib extending downward,
The said rib is a wiper apparatus provided in the edge part of the width direction far from the rocking | fluctuation range of the said rocking lever among the two edge parts of the width direction of the said vehicle body side extension part.
The wiper device according to any one of claims 14 to 18,
A rubber bush is fixed to the holder body fixing part,
The wiper device, wherein the holder body fixing portion is fixed to the vehicle body via the rubber bush.