JPH08196Y2 - Link arm for wiper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a link arm for a wiper device installed in a vehicle such as a private car.

[Problems to be Solved by Prior Art and Invention] Generally, in a power transmission mechanism for transmitting power from a wiper motor to a wiper arm, one end is supported by a spindle and a join ball is attached to the other end. A linked arm is provided.

However, since all the conventional link arms have a flat plate shape, they are inferior in strength, so that they have to be made thick and hinder weight reduction.

On the other hand, as an attempt to measure the strength up of the link arm, it has been proposed to bend the peripheral edge of the link arm into a cross-sectional shape, but this alone is not enough for the area where the support shaft and the ball joint are attached. Since it is still flat, the reinforcing effect is not sufficient, and it is required to measure further strength without increasing the wall thickness.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised with the object of providing a link arm for a wiper device that can eliminate these drawbacks. A link arm for a wiper device, one end of which is supported by a support shaft and the other end of which is attached a join ball in a power transmission mechanism until power is transmitted to the wiper arm. Both side edge portions bent over the entire length in the longitudinal direction, a pair of mounting cylindrical holes projecting from the link arm plate surface to support the support shaft and the ball support shaft of the joint ball long in the axial direction, and Reinforcing ribs, which are formed continuously from the cylinder peripheral surface of the mounting cylinder hole and extend between the two mounting cylinder holes, and which are curved in an arcuate cross section, are provided.

The present invention, with this structure, enables the link arm to be thin while achieving the required strength up.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a wiper motor, a base end of a link arm 2 is integrally fixed to a motor shaft 1a of the wiper motor 1, and a base end of a link rod 4 is interlocked with a tip end thereof via a joint ball mechanism 3. The distal end of the link rod 4 is linked to the distal end of a link arm 6 whose base end is integrally fixed to the wiper shaft 5 through a joint ball mechanism 7, and the wiper motor 1 is driven by the wiper motor 1. By the reciprocating rotation of the shaft 5, the wiper arm integrally provided on the wiper shaft 5 is wiped and swung.

Further, in the present embodiment, the present invention is applied to both the link arms 2 and 6.

Therefore, the link arm 6 will be described in detail below. That is, although the link arm 6 is made of metal, the side edges 6a have a substantially cross-sectional shape in a side view.
Are bent respectively. Link arm 6
A fixed cylindrical hole 6b for integrally fixing the wiper shaft 5 is formed at both ends of the, and the support shaft 7b of the join ball 7a constituting the join ball mechanism 7 is integrally fixed. The fixed cylindrical hole 6c is opened, but these fixed cylindrical holes 6b,
6c is formed in a cylindrical shape toward the same side as the side edges 6a with respect to the plate surface of the link arm 6 by a burring process or the like, and is axially formed with respect to the support shaft of the wiper shaft 5 and the joint ball 7a. It has a structure that can be long and wide fixed. Further, in the link arm 6, a reinforcing rib 6d having a semi-circular cross section is curved toward the bending direction of the both side sides 6a so as to extend from the cylindrical peripheral surfaces of the fixed cylindrical holes 6b and 6c so as to extend between both holes. It is formed and measures the strength up of the link arm 6.

In the embodiment of the present invention configured as described above, the link arm 6 has the joint ball 7a fixed to one end and the wiper shaft 5 fixed to the other end. Fixed cylindrical holes 6b and 6c that are bent to provide a first reinforcement and that are cylindrically formed to firmly fix the wiper shaft 5 and the joint ball 7a.
An arcuate reinforcing rib between both holes so as to continue from the cylinder peripheral surface
6d is formed and second reinforcement is made.

As a result, in the link arm 6, the reinforcement of the fixed cylindrical holes 6b and 6c itself and the reinforcement between the fixed cylindrical holes 6b and 6c are synergistic by the side edges 6a and the reinforcing ribs 6d formed on the same side. As a result of receiving the reinforcing action, it is possible to obtain a sufficiently satisfactory strength even if a thin plate material is used, and it is possible to reliably reduce the weight of the link arm 6.

By the way, the bent pieces 6a and the reinforcing ribs 6d that are bent can be changed in shape according to the size of the moment arm received by each part of the link arm 6. That is, if the moment arm is larger toward the fixed cylindrical hole 6b side and smaller than the fixed cylindrical hole 6c, the bending piece 6a
The bending protrusion amount and the arc diameter and depth of the reinforcing rib 6d can be correspondingly reduced toward the fixed cylindrical hole 6c side.

It should be noted that the present invention is not limited to the above embodiment, and the side edges 6a and the reinforcing ribs 6d need not be formed on the same side, but may be formed on the opposite side as shown in FIG. Further, in the case where the fixed cylindrical holes 6b and 6c are formed so as to project to the opposite sides from each other, reinforcing ribs may be formed on both sides as shown in FIG. 6, and further, both sides as shown in FIG. The edges may be bent in directions opposite to each other.

[Effects] In short, since the present invention is constructed as described above, the link arm has a mounting shaft and a mounting shaft of the joint ball which is long in the axial direction. The reinforcement and the reinforcement between the both mounting cylinder holes are synergistically performed by both side edges and the reinforcing ribs continuously formed from the cylinder peripheral surface of the mounting cylinder holes. By receiving a synergistic reinforcing action by both side edge portions and the reinforcing ribs, it is possible to secure necessary strength even if a thin plate material is used, which can greatly contribute to weight reduction of the link arm.

Moreover, this reinforcing rib is formed so as to be continuous from the cylindrical peripheral surface between both the mounting cylindrical holes, thereby providing both the reinforcing of the mounting cylindrical hole and the link arm itself.
Although the structure is simple, the substantial strength up can be sufficiently measured.

[Brief description of drawings]

The drawings show an embodiment of a link arm for a wiper device according to the present invention. FIG. 1 is a schematic view of the wiper device, FIG. 2 is a perspective view of the link arm, and FIGS. , C
Is a sectional view taken along line X-X, Y-Y, and Z-Z in FIG. 2, and FIG. 4 is a sectional view of a link arm showing a state in which the joint ball portion is assembled, FIG. 5, FIG. 6, FIG. The drawings are cross-sectional views of link arms showing other examples. In the figure, 1 is a wiper motor, 6 is a link arm, 5 is a wiper shaft, 6a is both side edges, 6b and 6c are fixed cylindrical holes, 6d is a reinforcing rib,
7a is a joint ball, and 7b is its supporting shaft.

Claims (1)

[Scope of utility model registration request] 1. A link arm for a wiper device, wherein one end is supported by a support shaft and the other end is provided with a joint ball in a power transmission mechanism for transmitting the power of a wiper motor to a wiper arm, The link arm includes both side edge portions bent over the entire length in the link length direction, and a pair of protrusions from the link arm plate surface for supporting the support shaft and the ball support shaft of the joint ball long in the axial direction. And a reinforcing rib curved in an arcuate cross-section formed continuously from the cylinder peripheral surface of each mounting cylinder hole between both mounting cylinder holes. Link arm for the device.