| 摘要 |
A device for wiping windscreens of automobiles includes a wiping arm linked to an oscillating guiding element and radially driven relative to the axis of oscillation by a slider-crank mechanism. It carries at its free end a wiper blade laid against the windscreen to be wiped. The guiding element has an oscillating lever which extends beyond the axis of oscillation. A toothed wheel with an axis of rotation parallel to the axis of oscillation is rotatively mounted on the oscillating lever. The toothed wheel cooperates with a gear fixed to the frame and concentric to the axis of oscillation. In order to obtain a reducing gear for the windscreen wiper with low tolerance and silent working, the toothed wheel is partially wound in a toothed belt having on both sides a toothed profile. The first, outer toothed profile engages the gear fixed to the frame and the other, inner toothed profile engages the first toothed wheel and a second toothed wheel which is partially wound in the toothed belt and rotatively mounted on the guiding element. The second toothed wheel is secured to the crank of the slider-crank mechanism. |
