| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiper unit for a vehicle that not only expands the wiper range by being a four joint link type, but also in which the wiper arm action is smooth and thereby not irritating to the passengers by a main lever, a sub lever and an arm head. SOLUTION: The wiper for a vehicle is a four link type in which a main lever 14 and a sub lever 16 are connected to an arm head 24. The rotation angle range of the main lever 14 is set such that the rotation angle speed of a wiper arm 12 is in a range of 0.75 to 1.25 (fluctuation width is in a range of±25%) times that of the main lever 14. Pitch a to d between the connecting axis of the four link system according to each lever is set such that the wiper arm 12 rotates at a predetermined angle within the rotation angle range of the main lever 14. Therefore, not only is the wiper range expanded, but the action of the wiper arm 12 is smooth and the fluctuation width of the rotation angle speed will not become too great.
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