| 摘要 |
An overflow valve is provided in a distributor-type fuel injection pump, for returning excess fuel from the suction chamber of the pump to a lower pressure zone in the pump. The valve comprises a passage communicating with the suction chamber, a check valve arranged within the passage and operable in response to the suction chamber pressure for closing and opening the same passage, and throttle forming means formed by the passage and the check valve. The valve body of the check valve has a pressure-applying surface on which the suction chamber pressure acts in the valve-opening direction, and which assumes a larger surface area when the valve is in an open position than when it is in a closed position. The check valve is closed at the start of the engine to increase the suction chamber pressure so that the timing device of the fuel injection pump acts to advance the fuel injection timing.
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