| 摘要 |
PURPOSE:To attempt the improvement of a duration in an unit equipped with both a charging pump and a charging accumulator by providing a leakage means to the accumulator whereby maintaining a leakage condition during the suspension of a high pressure pump in order not to apply high pressure to high pressure hoses. CONSTITUTION:A pumping device which feeds oil pressure to an oil control device in an antilock type oil pressure brake system, includes a block 90 incorporating a charging pump 92, a charging accumulator 94 and two high pressure pumps 96, whereby pressurizing oil sucked from a suction port 98 in two steps for discharging it from a discharge port 100. In this case, a pressure accumulating chamber 126 of the accumulator 94 is communicated with a low pressure chamber 128 by an orifice 132 as a leakage means through a relief passage 130. And a communication passage 154 is provided to communicate the pressure accumulating chamber 126 with a discharge passage 152, and a check valve 156 which is opened by means of a valve opening projection 158 provided to the piston 122 of the accumulator 94, is provided to said communication passage 154. |
