| 摘要 |
{PG,1 A hydraulic driving unit for windshield wipers comprising a transmitter having a double-acting piston with chambers at opposite ends thereof adapted to convey to corresponding chambers of two series connected motors, quantities of liquid which are greater than the quantities of liquid in the corresponding chambers of the motors. Each motor is connected by a rack and pinion device to a respective windshield wiper. The pistons in the motors are provided with passageways connecting the opposite end chambers and valves are contained in the passageways for being respectively opened to control the flow of excess liquid from one chamber to the other when the pistons have reached their end of stroke positions. An auxiliary pump is connected to the transmitter for circulation of a leakage liquid from the transmitter or from the motors back to the chambers of the transmitter. |
