The present invention relates to a pivot assembly for a vehicle wiper system. The assembly includes a pivot shaft rotatably supported in central passage of a pivot housing, a lever coupled to the pivot shaft, and a cover. The cover includes a tubular portion, cylindrical step and a transition portion integrally formed between the tubular portion and the cylindrical step. The cover further includes a cantilever snap extending from inner surface of the transition portion, in longitudinal direction of the cover. A protrusion is formed in the cylindrical step at a location adjacent to the snap. The tubular portion of the cover is received over pivot shaft and a locking profile formed at free end of the snap is received in a recess formed in top end of the pivot housing, thereby restricting longitudinal and rotational movements of the cover with respect to the pivot housing.

A vehicle wiper device includes: a wiper motor; a control unit that drives the wiper motor to be reciprocally rotated and controls a rotation speed of the wiper motor; and a wiper reciprocally rotating to wipe a wiped surface of a vehicle with a blade rubber, in which a tilt direction of a lip part of the blade rubber changes when a rotation direction is reversed. The control unit accelerates a rotation speed of the wiper motor, in a first acceleration section, from 0 to a first speed which is a low speed at a first average acceleration, and to rapidly accelerate the rotation speed of the motor, in a first half of a second acceleration section, to reach a speed which is higher than the first speed and times of a second speed at an average acceleration which is twice or more of the first average acceleration.