MECHANISM FOR DYNAMICALLY VARYING BLADE LOAD OVER A WINDSHIELD WIPER SWEEP CYCLE

摘要

A wiper arm assembly (14) has a load member (28), a wiper arm (24), and a blade load cam (32) with a cam slot (36). The load member (28) mates with a joint (40) disposed between first and second ends of the wiper arm (20). Changes in length of the load member (28) impose a force (L) in a lengthwise direction of the load member (28). The wiper arm (24) is configured to rotate relative to the blade load cam (32) about an axis proximate to the first end of the wiper arm (24). The cam slot (36) is configured to vary the length of the load member (28) as a function of a wiper angle in which the wiper angle is defined as the angle between the wiper arm (24) and a starting position of the wiper arm (24).