JP2000043683A - Link mechanism and wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a link mechanism and a wiper device capable of attaining cost and weight reduction, and easy connecting work by making parts common in connecting a lever and a plurality of link rods by a ball joint formed out of a ball pin and a ball receiving part. SOLUTION: This wiper device is provided with ball supporting parts 86, 88 of link rods 76, 78 engaged and connected with a ball pin 84 of a crank arm 72. The prepared hole 94, 96 of the link rods 76, 78 where the respective ball receiving parts 86, 88 are formed in one body are long in its longitudinal direction and have the same dimensions. Driving load of the link rods 76, 78 works largely in the longitudinal direction, therefore required strength can be attained by ensuring the widths of the respective ball receiving parts 86, 88 in the longitudinal direction, and base materials of the link rods 76, 78 can be used in common by setting the widths of the respective ball receiving parts 86, 88 so as to meet different diameter dimensions of respective spherical parts 90, 92.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link mechanism in which a lever and a plurality of link rods are connected to each other, and to a wiper device formed by applying the link mechanism.

[0002]

2. Description of the Related Art A link mechanism using a so-called ball joint comprising a ball pin and a ball receiving portion fitted to the ball pin has been applied to various fields. For example, a wiper for wiping windshield glass of an automobile is known. The device is applied as a mechanism for transmitting a rotational driving force to a pivot shaft.

In such a wiper device, a pivot lever is fixed to one end of a pivot shaft rotatably supported by a pivot holder, and a crank arm is fixed to an output shaft of the wiper motor. further,
There is a configuration in which separate link rods are connected to the crank arms, respectively, and the other end of each link rod is connected to a pivot lever.

As described above, in a so-called double swing type wiper device in which the crank arm of the wiper motor is connected to both pivot levers by separate link rods, the length of each link rod can be reduced. The link rods are arranged from the wiper motor to both pivot levers in opposite directions, so that the link rods do not cross each other and the dynamic space does not overlap, preventing interference, and laying out on one side (one side) of the frame. Since it is possible, it is possible to constitute a small and lightweight device as a whole. In particular, depending on the layout of each component such as the wiper motor and the pivot lever, each link rod can be of exactly the same length.

By the way, at the connecting portion between the crank arm of the wiper motor and each link rod as described above,
Conventionally, a ball joint (ball joint) has been adopted.
That is, usually, a ball pin is provided on the crank arm side and a ball receiving portion is provided on the link rod side, and the crank arm and the link rod are connected by fitting the ball receiving portion on the ball pin. . Further, in this case, in each link rod, if the connection position with the crank arm (that is, the position of the ball pin) may be the same position, the ball pin having the two-stage spherical portion in the axial direction is provided. Can be adopted.

Further, when such a two-stage ball pin is employed, if the outer diameter of the spherical portion on the tip side of the ball pin is set to be the same as the outer diameter of the spherical portion on the root side (in other words, Then, if both ball receiving portions of the two link rods have the same diameter), if the lengths of the link rods are the same, these two link rods can be configured as the same part. However, if the two-stage spherical portion of the ball pin is set to have the same diameter in this way, when the link rod is connected to the spherical portion on the root side of the ball pin, the spherical portion on the distal end side is the ball of the link rod. There is a drawback that interference occurs with the receiving portion, which causes resistance during connection of the link rod (fitting of the ball receiving portion to the ball pin), thereby preventing smooth connection. As described above, if the configuration is made with emphasis on the common use (common use) of the link rods (parts), there is a disadvantage that the assemblability is deteriorated.

On the other hand, in order to perform a smooth assembly without the above-mentioned resistance, it is conceivable to adopt a ball pin having a small spherical portion at the tip end and a large diameter at the root spherical portion. A ball receiving portion corresponding to the diameter of the spherical portion is required. Therefore, the link rod corresponding to the large-diameter spherical portion and the link rod corresponding to the small-diameter spherical portion also have different diameters of the pilot holes of the rods in which the ball receiving portions are formed. It is necessary to prepare different materials (thickness of pipe material). Also, in this case, when trying to share such a link rod, it is necessary to configure a link rod corresponding to the small-diameter spherical portion in accordance with the link rod corresponding to the large-diameter spherical portion. It is necessary to be configured according to the rod base material on the side, and it is expensive and heavy.

[0008]

In view of the above facts, the present invention takes into account the above facts, and a ball pin fixed to one lever is provided with a plurality of spherical portions, and a ball receiving portion of a link rod is fitted into each spherical portion. In a link mechanism in which a lever and a plurality of link rods are connected to each other and a wiper device to which such a link mechanism is applied, even if the diameter of each spherical portion (ie, ball receiving portion) of a ball pin is different, Can be used (shared), and an inexpensive and low-weight rod base material can be adopted.
An object of the present invention is to provide a link mechanism and a wiper device that can smoothly connect a link rod without receiving a large resistance.

[0009]

According to a first aspect of the present invention, there is provided a link mechanism, wherein a plurality of spherical portions are provided in the axial direction of a ball pin fixed to one lever, and the plurality of spherical portions of the ball pin are provided. A ball receiving portion of a link rod is rotatably fitted to each portion, and the lever and a plurality of link rods are connected to each other. The plurality of link rods each have a long hole of the same size elongated along the longitudinal direction, and are formed in order from the one located on the side to the one located on the root side. The ball receiving portion is formed in the hole, and each of the ball receiving portions has a wall width corresponding to a different diameter of each of the spherical portions of the ball pin. Adapted to the department , It is characterized in that.

[0010] In the link mechanism according to the first aspect, the plurality of spherical portions provided on the ball pin are sequentially formed to have larger diameters from the one located on the tip side to the one located on the root side. Each of the plurality of link rods has a long hole of the same size elongated in the longitudinal direction, and a ball receiving portion is formed in the long hole.

Here, in the link rod in such a link mechanism, it is necessary to secure a sufficient width of the ball receiving portion in order to obtain a necessary strength for a connecting portion thereof, that is, a ball receiving portion to sufficiently withstand a driving load. . In this case, the driving load of the link rod acts largely in the longitudinal direction of the link rod, and the driving load acting in the width direction of the link rod is significantly smaller than the load acting in the longitudinal direction. Therefore, the required strength can be obtained by securing a predetermined width of the ball receiving portion along the longitudinal direction of the link rod,
On the other hand, the thickness of the ball receiving portion along the width direction of the link rod can be made small (thin). In other words, the ball receiving portion should have an inner diameter that allows the spherical portion of the ball pin and a width along the longitudinal direction of the link rod that is necessary to receive the driving load of the link rod. become.

Therefore, in the link mechanism according to the first aspect, as described above, the size of the long hole having the same size provided in each of the link rods is changed to the maximum diameter size (the root of the ball pin) of the plurality of spherical portions. If the ball can be made to have the ball width of the width necessary to receive the driving load of the link rod, it is possible to accommodate all other small-diameter spherical parts. it can. That is, if it is a long hole set to a size capable of forming a ball receiving portion capable of accepting the spherical portion having the maximum diameter, the width of the ball receiving portion formed in this long hole is made thicker and its inner diameter is reduced. By doing so, it can be adapted to a small-diameter spherical portion. At this time, since the wall width of the ball receiving portion is naturally thicker than the dimension required to receive the driving load of the link rod, a larger load resistance can be secured.

[0013] As described above, the long hole having the maximum diameter can be allowed among the plurality of spherical portions, and the ball receiving portion having the wall width required to receive the driving load of the link rod can be formed. By setting, all of the plurality of link rods (rod base materials other than the ball receiving portion) can be shared (shared).

Instead of the conventional ball receiving portion having a uniform thickness, the pilot hole in which the ball receiving portion of the link rod is formed is an elongated hole. The required ball width is ensured along the direction in which the driving load is large (longitudinal direction of the link rod), and the ball receiving portion is made thin in the direction in which the small driving load acts (link rod width direction). Even if the width dimension of the link rod itself is made smaller than before, a ball pin spherical portion having a large diameter can be tolerated. For this reason, not only can a plurality of link rods be used in common, but also the rod base material needs to adopt a thick one that matches a conventional large-diameter pilot hole (corresponding to the long hole of the present invention). In addition, the size can be reduced to a small size corresponding to the short dimension of the long hole (the dimension in the width direction of the ball receiving portion), and the cost can be reduced.

According to a second aspect of the present invention, in the link mechanism according to the first aspect, an opening size of the fitting portion corresponding to the spherical portion of the ball receiving portion is such that the ball receiving portion is connected thereto. It is characterized in that it is set to be equal to or larger than the diameter of the spherical portion immediately before the spherical portion.

Here, when the link rod is to be connected to the spherical portion located on the ball pin root side among the plurality of stages of spherical portions provided on the ball pin, the fitting portion opening dimension of the ball receiving portion is temporarily reduced. If it is smaller, the spherical portion closer to the ball pin tip than the spherical portion to which the link rod is connected becomes a resistance when the ball receiving portion is inserted.

On the other hand, in the link mechanism according to the second aspect, the plurality of stages of the spherical portions provided on the ball pin have a larger diameter as being located closer to the root side of the ball pin.
Since the opening size of the fitting portion of the ball receiving portion is equal to or larger than the diameter of the spherical portion immediately before the spherical portion to which the ball receiving portion is connected, the spherical portion on the tip side of the ball pin does not become a resistance at the time of insertion. The link rod can be easily connected.

According to a third aspect of the present invention, in the wiper device, a pivot lever is fixed to one end of a pivot shaft rotatably supported by a pivot holder, and the crank arm fixed to the output shaft of the wiper motor includes a plurality of crank arms. In the wiper device connected to the pivot lever through separate link rods, a plurality of spherical portions are provided in the axial direction of the ball pin fixed to the crank arm, and the plurality of spherical portions of the ball pin are provided. The ball receiving portions of the respective link rods are rotatably fitted to each other, the crank arm and the respective link rods are connected to each other, and the plurality of spherical portions of the ball pins are located on the tip side. The plurality of link rods are sequentially formed to have a large diameter over the one located on the root side, and the plurality of link rods have the same size elongated along the longitudinal direction. Each of the ball receiving portions has an elongated hole, and the ball receiving portion is formed in the elongated hole, and each of the ball receiving portions is formed so that its wall width corresponds to a different diameter of each spherical portion of the ball pin. Wherein each of the inner diameter dimensions is adapted to each of the spherical portions.

According to a third aspect of the present invention, the wiper device is of a so-called double swing type in which a crank arm fixed to an output shaft of the wiper motor is connected to a plurality of pivot levers via separate link rods. Therefore, basically, there is an advantage that the link rod can be shortened.

Here, in the wiper device according to the third aspect, each link rod connected to the crank arm is made of a rod base material other than the ball receiving portion, similarly to the link mechanism according to the first aspect. All can be shared (shared), and the rod base material can be made small, low-weight, and inexpensive according to the short dimension of the long hole (the width direction dimension of the ball receiving portion). .

In particular, in such a wiper device configured as a double swing type, the arrangement of the crank arm of the wiper motor and each pivot lever, that is, each set position of the wiper device (such as a set position of the wiper or an upside-down position). By arranging the crank arm of the wiper motor at the same distance from each pivot lever, the length of each link rod can be the same, so that each link rod (rod body excluding the ball receiving portion) has a length and thickness. A pipe-shaped base material having the same length can be used, parts can be shared (the number of parts can be reduced), and an inexpensive wiper device can be obtained.

[0022]

FIG. 1 is a plan view showing the overall configuration of a wiper device 10 according to an embodiment of the present invention, and FIG. 2 is a front view showing the overall configuration of the wiper device 10. It is shown. FIG. 3 is an exploded perspective view showing a configuration of a main part of the wiper device 10.

The wiper device 10 includes a pair of pivot holders 12 and 14. The pivot holder 12 and the pivot holder 14 are formed symmetrically to the left and right, and have the same basic configuration. The pivot holder 12 is provided with a tubular portion 16, and the pivot holder 14 is provided with a tubular portion 18. These cylindrical portions 16 and 18 are formed in a cylindrical shape, and a pivot shaft 20 and a pivot shaft 22 are inserted therethrough and rotatably support them. Pivot levers 24 and 26 are fixed to the lower ends of the pivot shafts 20 and 22, respectively.
The pivot shafts 20 and 22 are rotated by swinging of the pivot levers 24 and 26. Also,
At the corners of the member of the pivot holders 12 and 14, mounting holes 2 are provided.
8, 30 are formed respectively. These mounting holes 2
The wiper device 10 is configured to be fixed to a vehicle body by mounting bolts inserted through the wipers 8 and 30.

The pivot shafts 12 and 14 have connecting shafts 3 on the side walls opposite to the mounting holes 28 and 30.
2, 34 are provided. Connection shaft 32, 34
Is a solid shaft (solid shaft) with a circular cross section,
The distal ends thereof are a connecting portion 36 and a connecting portion 38 which are fitted and connected to a hollow frame 42 described later. The connection shafts 32 and 34 are not limited to solid shafts having a circular cross section, but may be formed as hollow shafts having a circular cross section.

As shown in FIG. 3, the connecting portions 36 and 38
Each of the recesses 40 is formed. The connecting portion 36 of the pivot holder 12 and the connecting portion 38 of the pivot holder 14
Are connected to each other by a hollow frame 42.

At both ends in the longitudinal direction of the hollow frame 42 are connected portions 44 and 46 corresponding to the connected portions 36 and 38 of the connecting shafts 32 and 34, respectively. The connecting portions 44 and 46 are formed in an annular cross section. The connecting portion 44 fits into the connecting portion 36, and the connecting portion 46 fits into the connecting portion 38. Correspondingly, the connecting portions 44 and 46 are caulked, respectively, and connected and fixed to the connecting portions 36 and 38, respectively.

A mounting portion 48 is formed at a longitudinally intermediate portion of the hollow frame 42. As shown in FIG.
The mounting portion 48 is formed in a U-shaped cross section that is not hollow, and the upper surface thereof is a mounting flat seat surface 50. Further, the mounting portion 48 is formed with a pair of mounting holes 52 for fixing a drive source described later. This mounting hole 52
Penetrates the front and back sides of the mounting portion 48 (the mounting flat seat surface 50).

A gradually changing portion 54 and a gradually changing portion 56 are provided on both longitudinal sides of the mounting portion 48 of the hollow frame 42.
Here, FIGS. 9 (A) to 9 (D) show this gradually changing portion 5.
Details of 4 and 56 are shown in cross-sectional views along the lines AA to DD in FIG. As shown in the figures, the gradually changing portions 54 and 56 are connected to the connecting portions 44 and 4 from the mounting portion 48, respectively.
The shape is gradually changed from the solid U-shaped cross-section toward the cross-section toward the cross-section toward the hollow portion 6.

The hollow frame 42 (the mounting portion 4) having the above structure
8, the gradually changing portions 54, 56, etc.) are formed by pressing a hollow base material (pipe material) having an annular cross section. In particular, the aforementioned gradually changing portions 54, 56 are attached to the mounting portion 48.
Is formed at the same time as the press working for forming Further, a pair of mounting holes 52 of the mounting portion 48 described above.
Are formed in the same step as the press working step for forming the mounting portion 48.

The mounting portion 48 of the hollow frame 42 has a flat mounting surface 50 on which a wiper motor 58 as a drive source is mounted.
Is attached. The wiper motor 58 has a configuration in which a motor section 58A and a gear section 58B are provided integrally, and a pair of mounting feet 62 are formed to project from a housing 60 of the gear section 58B. The mounting feet 62 are placed on the mounting flat seating surface 50 of the mounting portion 48 of the hollow frame 42, and are fastened and fixed by bolts 64 and nuts 66 in this state. The wiper motor 58
The housing 60 has a positioning pin 68 protruding toward the front side (the lower side in the drawing in FIG. 1 and the front side in the drawing in FIG. 2), and is fitted into a positioning hole (not shown) on the vehicle body side. The positioning and support is achieved by

As described above, the wiper device 10 has a so-called frame-integrated structure in which the pair of pivot holders 12 and 14 are integrally formed with the hollow frame 42 as a support base for the wiper motor 58.

The output shaft 70 of the wiper motor 58 protrudes toward the back side of the housing 60 (the back side of the paper in FIG. 1, the lower side of the paper in FIG. 2), and a crank arm 72 is attached to the tip thereof. . A link rod 76 and a link rod 78 are connected to a distal end of the crank arm 72 via a ball joint 74.

Here, FIG.
The details of the connecting portion (that is, the ball joint 74 portion) between the second member 2 and the link rod 76 and the link rod 78 are shown in a partially broken front view.

The ball joint 74 includes a ball pin 84 provided on the crank arm 72, a ball receiving portion 86 provided on the link rod 76, and a ball receiving portion 88 provided on the link rod 78. The ball pin 84 is fixed to the distal end of the crank arm 72, and is provided with two stages of spherical portions 90 and 92 along the axial direction. The spherical portions 90 and 92 are such that the spherical portion 90 located on the root side is the spherical portion 9 located on the tip side.
For example, in the present embodiment, the spherical portion 90 is formed with a diameter of 14 mm (φ14), and the spherical portion 92 is formed with a diameter of 12 mm (φ1).
2) is formed.

On the other hand, as shown in detail in FIG. 6, the ball receiving portion 86 is formed integrally with a pilot hole 94 formed in the link rod 76, and the ball receiving portion 88 is formed in detail in FIG. As shown, a pilot hole 96 formed in the link rod 78 is shown.
Are formed integrally. The ball receiving portion 86 is rotatably fitted to the spherical portion 90 of the ball pin 84, and the ball receiving portion 88 is rotatably fitted to the spherical portion 92 of the ball pin 84. Link rod 7
6, 78 are connected to each other.

Further, here, the link rod 76 integrally formed with the ball receiving portion 86 and the link rod 78 integrally formed with the ball receiving portion 88 are formed as parts having the same dimensions. In the embodiment, the width is set to 20 mm. Further, as shown in detail in FIG. 5, a pilot hole 94 provided in the link rod 76 and integrally formed with a ball receiving portion 86,
8 formed with a ball receiving portion 88 integrally therewith.
6 are elongated along the longitudinal direction and have the same dimensions. That is, each pilot hole 94, 9
6 has a major axis of 18 mm and a minor axis of 15 mm
Is formed. A ball receiving portion 86 or a ball receiving portion 88 is formed in each of the prepared holes 94 and 96 having the same dimensions.
Y (see FIG. 6) and wall width dimensions V and W (see FIG. 7) of the ball receiving portion 88 are different from each other. That is, the ball receiving portions 86 and 88 are formed such that the wall widths thereof correspond to the respective different diameters of the spherical portions 90 and 92 of the ball pin 84, so that the inner diameter of the fitting portion is different from that of each spherical portion. 9
0 and 92 respectively.

Further, in this case, the fitting portion opening dimension S of the ball receiving portion 86 corresponding to the spherical portion 90 located on the root side of the ball pin 84 is the spherical portion 92 located on the tip side of the ball pin 84 (that is, the spherical portion 92). The diameter (φ12) of the spherical portion 92 immediately before the spherical portion 90 to which the ball receiving portion 86 is connected is set to be larger.

One link rod 76 connected to the crank arm 72 by the above configuration is connected to the pivot lever 24 of the pivot shaft 20 supported by the pivot holder 12 via a ball joint 80, and the other is connected to the other. Is connected to the pivot lever 26 of the pivot shaft 22 supported by the pivot holder 14 via a ball joint 82. As a result, the wiper motor 58 operates and the crank arm 72 rotates, thereby causing the link rods 76 and 7 to rotate.
Driving force is transmitted through the drive shaft 8 and the pivot levers 24 and 26, and the pivot shafts 20 and 22 rotate.

Wiper arms and blades (not shown) are attached to the ends of the pivot shafts 20 and 22, respectively. The rotation of the pivot shafts 20 and 22 causes the wiper arms and blades to reciprocate within a predetermined range. I have.

Next, the operation of the present embodiment will be described.

In the wiper device 10 having the above-described configuration, the pivot holders 12 and 14 that rotatably support the pivot shafts 20 and 22 are connected to each other by the hollow frame 42, and the mounting portion 48 (the mounting flat seating surface) of the hollow frame 42. The wiper motor 58 is directly fixed to 50), and is in an assembled state as a whole. In this state, the positioning pins 68 provided on the housing 60 of the wiper motor 58 are positioned by fitting into the positioning holes on the vehicle body side, and the window is fixed by the mounting bolts inserted into the mounting holes 28 and 30 of the pivot holders 12 and 14. It is fixed to the vehicle body structural member below the shield glass.

Further, the operation of the wiper motor 58 causes the pivot shafts 20 and 22 to rotate, and the wiper arm and blade reciprocate within a predetermined range to wipe out raindrops and the like on the windshield glass.

In the wiper device 10, the wiper motor 5
A crank arm 72 fixed to the output shaft 70 is connected to the pivot levers 24 and 26 via separate link rods 76 and 78, respectively. Therefore, basically, there is an advantage that the link rod can be shortened.

In the ball joint 74 for connecting the crank arm 72 to the link rod 76 and the link rod 78, the two-stage spherical portions 90 and 92 provided on the ball pin 84 have spherical portions 90 and 92 located on the root side. The portion 90 has a larger diameter than the spherical portion 92 located on the distal end side. Further, the link rod 76 and the link rod 78 have pilot holes 94 and 96 of the same size elongated in the longitudinal direction, respectively.
96 are provided with ball receiving portions 86 and 88, respectively.

Here, the link rods 76, 78 in such a link mechanism are provided with the ball receiving portions 86, 88 in order to obtain the necessary strength that the connecting portion, that is, the ball receiving portions 86, 88 can sufficiently withstand the driving load. It is necessary to secure the meat width. In this case, the driving load of the link rods 76, 78 largely acts in the longitudinal direction of the link rods 76, 78, and the driving load acting in the width direction of the link rods 76, 78 is significantly greater than the load acting in the longitudinal direction. Small. Therefore, the required strength can be obtained by securing the ball width of the ball receiving portions 86 and 88 to a predetermined length along the longitudinal direction of the link rods 76 and 78, whereas the width of the link rods 76 and 78 can be increased. Ball receivers 86, 8 along
8 can be formed small (thin).
That is, the ball receiving portions 86 and 88 have a fitting portion inner diameter that is capable of accepting the spherical portions 90 and 92 of the ball pin 84, and have a wall width along the longitudinal direction of the link rods 76 and 78. Any size required to receive the driving load of 78 is sufficient.

Therefore, in the wiper device 10 according to the present embodiment, as described above, each of the link rods 76, 7
8, the size of the pilot holes 94, 96 of the same dimensions can be changed to allow the large-diameter spherical portion 90 (the root side of the ball pin 84) of the two-stage spherical portions 90, 92, and the link rod 76 As long as the ball receiving portion 86 having the wall width dimension X necessary to receive the driving load is formed, the ball portion 92 having the other small diameter can be used. That is, if the pilot hole 96 is the same as the pilot hole 94 set to the size that can form the ball receiving part 86 that can accept the large-diameter spherical part 90, the thickness of the ball receiving part 88 formed in the pilot hole 96 is sufficient. By increasing the width dimension V and decreasing the inner diameter of the fitting portion, it is possible to adapt to the small-diameter spherical portion 92. At this time, the wall width dimensions V and W of the ball receiving portion 88 are naturally larger than the dimensions required for receiving the driving load of the link rods 76 and 78, so that a larger load resistance can be secured.

As described above, the spherical portion 90 having a large diameter among the two stages of the spherical portions 90 and 92 can be tolerated, and the ball receiving portion 86 has a wall width dimension necessary to receive the driving load of the link rods 76 and 78. , 88 to a size capable of forming the same.
By setting 96, all of the link rods 76 and 78 (rod base materials other than the ball receiving portions 86 and 88) can be shared (shared).

Further, instead of the conventional ball receiving portion having a uniform thickness and a wall thickness, link rods 76 and 7 are used.
Pilot holes 94, 96 in which the eight ball receiving portions 86, 88 are formed.
Is used as a long hole, and the ball receiving portions 86, 88 formed in the pilot holes 94, 96 are secured to a required wall width along a direction in which the driving load is large (longitudinal direction of the link rods 76, 78) so that a small driving load is secured. The thickness of the ball pin spherical portion 90 having a large diameter even when the width dimension of the link rods 76 and 78 themselves is made smaller than that of the related art by making the wall thickness thin along the direction in which the link acts (the width direction of the link rods 76 and 78). acceptable. Therefore, not only can the link rods 76 and 78 be used in common, but also the rod base material can be made thicker so as to fit a conventional large-diameter pilot hole (corresponding to the major diameter of the pilot holes 94 and 96 of the present invention). It is not necessary to adopt the above, and it is possible to achieve a small size, a low weight, and a low cost according to the short diameter of the pilot holes 94 and 96 (the width direction dimensions of the ball receiving portions 86 and 88).

Here, when the link rod 76 is to be connected to the spherical portion 90 located on the root side of the ball pin 84 among the two-stage spherical portions 90 and 92 provided on the ball pin 84, temporarily If the opening size S of the fitting portion of the receiving portion 86 is small, the spherical portion 9 to which the link rod 76 is connected is formed.
The spherical portion 92 closer to the tip of the ball pin 84 than 0 becomes a resistance when the ball receiving portion 86 is inserted.

In this regard, the wiper device 1 according to the present embodiment
0, the two-stage spherical portion 9 provided on the ball pin 84
Reference numerals 0 and 92 indicate that the spherical portion 90 located on the root side of the ball pin 84 has a larger diameter, but the fitting portion of the ball receiving portion 86 corresponding to the spherical portion 90 located on the root side of the ball pin 84. Since the opening size S is set to be larger than the diameter of the spherical portion 92 located on the tip end side of the ball pin 84 (that is, the spherical portion 92 immediately before the spherical portion 90 to which the ball receiving portion 86 is connected), Spherical part 9 on the tip side of ball pin 84
The connection work of the link rods 76 and 78 can be smoothly performed without causing resistance when the ball 2 passes through the ball receiving portion 86.

As described above, in this wiper device 10, each link rod 7 connected to the crank arm 72
The rod base materials 6 and 78 can share (commonize) all the rod base materials other than the ball receiving portions 86 and 88, and furthermore, the rod base materials can be formed into the short diameters of the pilot holes 94 and 96 (the ball receiving portions). 86, 88 in the width direction), small weight, low weight and low cost.

In particular, in the wiper device 10 configured as such a double swing type, the arrangement of the crank arm 72 of the wiper motor 58 and each of the pivot levers 24 and 26,
That is, by disposing the crank arm 72 of the wiper motor 58 at the same distance from each of the pivot levers 24 and 26 at each set position of the wiper device 10 (such as the set position of the wiper arm and blade or the upside-down position),
Since the length of each link rod 76, 78 can be the same, each link rod 76, 78 (ball receiving portion 8
For the rod body (excluding 6, 88), a pipe-shaped base material having the same length and thickness can be adopted, parts can be shared (the number of parts can be reduced), and the inexpensive wiper device 10 can be obtained. be able to.

In the above-described embodiment, two-stage ball receiving portions 86 and 88 are formed on the ball pin 84 of the ball joint 74 that connects the crank arm 72 of the wiper motor 58 and the link rods 76 and 78. Although the configuration in which the two link rods 76 and 78 are connected to the crank arm 72 has been described,
The present invention is not limited to this, and a configuration in which three or more ball receiving portions are formed on the ball pins 84 of the ball joint 74, that is, a configuration in which three or more link rods are connected to the crank arm 72. Can be applied.

In the above-described embodiment, an example in which the link mechanism is applied to the wiper device 10 has been described. However, the link mechanism according to the present invention is not limited to such a wiper device 10, It can be applied to other structures.

[Brief description of the drawings]

FIG. 1 is a plan view showing an overall configuration of a wiper device according to an embodiment of the present invention.

FIG. 2 is a front view showing the overall configuration of the wiper device according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a configuration of a main part of the wiper device according to the embodiment of the present invention.

FIG. 4 is a partially cutaway front view showing details of a ball joint for connecting a crank arm and a link rod of the wiper device according to the embodiment of the present invention.

FIG. 5 is a perspective view showing details of a link rod and a pilot hole formed in the link rod of the wiper device according to the embodiment of the present invention.

6A and 6B show details of one link rod and a ball receiving portion formed on the one link rod of the wiper device according to the embodiment of the present invention, wherein FIG. 6A is a plan view and FIG. 6B is a plan view of FIG. It is sectional drawing which followed the Aa line, (C) is sectional drawing which followed the II line of (A).

7A and 7B show details of the other link rod and the ball receiving portion formed on the other link rod of the wiper device according to the embodiment of the present invention, wherein FIG. 7A is a plan view, and FIG. It is sectional drawing which followed the Aa line, (C) is sectional drawing which followed the II line of (A).

FIG. 8 is a sectional view showing details of a mounting portion of a hollow frame included in the wiper device according to the embodiment of the present invention.

FIG. 9 is a sectional view showing details of a gradually changing portion of the hollow frame included in the wiper device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wiper apparatus 12 Pivot holder 14 Pivot holder 20 Pivot shaft 22 Pivot shaft 24 Pivot lever 26 Pivot lever 42 Hollow frame 58 Wiper motor 72 Crank arm (lever) 74 Ball joint 76 Link rod 78 Link rod 84 Ball pin 86 Ball receiving part 88 Ball Receiving part 90 Spherical part 92 Spherical part 94 Prepared hole (long hole) 96 Prepared hole (long hole)

Claims (3)

[Claims] A ball pin fixed to one lever is provided with a plurality of spherical portions in the axial direction of the ball pin, and the ball receiving portions of the link rods are respectively rotatably fitted on the plurality of spherical portions of the ball pin. In addition, a link mechanism in which the lever and a plurality of link rods are connected to each other, wherein the plurality of spherical portions of the ball pin are sequentially increased in size from a position located on the tip side to a position located on the root side. A plurality of link rods, each of the plurality of link rods having an elongated hole of the same dimension elongated along a longitudinal direction, and the ball receiving portion being formed in the elongated hole; The link mechanism is characterized in that the width of the wall is formed corresponding to the different diameters of the respective spherical portions of the ball pin, so that the respective inner diameters are adapted to the respective spherical portions. 2. The method according to claim 2, wherein a dimension of an opening of the fitting portion corresponding to the spherical portion of the ball receiving portion is set to be equal to or larger than a diameter of a spherical portion immediately before the spherical portion to which the ball receiving portion is connected. The link mechanism according to claim 1, wherein: 3. A pivot lever is fixed to one end of a pivot shaft rotatably supported by a pivot holder,
The crank arm fixed to the output shaft of the wiper motor
In a wiper device connected to the plurality of pivot levers via separate link rods, a plurality of spherical portions are provided in an axial direction of a ball pin fixed to the crank arm, and a plurality of spherical portions of the ball pin are provided. The ball receiving portion of each of the link rods is rotatably fitted to the spherical portion, and the crank arm and each of the link rods are connected to each other. The multi-stage spherical portion of the ball pin is located on the distal end side. The plurality of link rods each have a long hole of the same dimension which is elongated along the longitudinal direction, and the plurality of link rods have the same diameter. A ball receiving portion is formed, and each of the ball receiving portions is formed with a wall width corresponding to a different diameter of each of the spherical portions of the ball pin, so that each of the inner diameters is different. A wiper device, wherein a method is adapted to each of the spherical portions.