Pumps – Successive stages – Parallel stages to or from single stage
Patent
1987-02-27
1988-10-18
Croyle, Carlton R.
Pumps
Successive stages
Parallel stages to or from single stage
417252, F04B 104
Patent
active
047783508
ABSTRACT:
A hydraulic pump assembly includes a cam shaft, a pair of high pressure plunger pumps opposed to each other on a first common axis, each of the high pressure plunger pumps having a first plunger of small diameter perpendicular to the cam shaft for reciprocation by engagement therewith, a low pressure plunger pump arranged on a second axis angularly displaced with respect to the first common axis in a circumferential direction of the cam shaft, the low pressure plunger pump having a second plunger of large diameter perpendicular to the cam shaft for reciprocation by engagement therewith, an accumulator arranged to temporarily store hydraulic fluid under pressure discharged from the low pressure plunger pump, and a relief valve arranged to release an excessive hydraulic pressure from the accumulator for maintaining the hydraulic pressure in the accumulator in a predetermined value. The high pressure plunger pumps are arranged to be supplied with the hydraulic fluid under pressure from the accumulator.
REFERENCES:
patent: 169999 (1875-11-01), Laney
patent: 797417 (1905-08-01), Engelking
patent: 1092359 (1914-04-01), Heinrich
patent: 1261437 (1918-04-01), Reavell et al.
patent: 1634093 (1927-06-01), Clark
patent: 2653543 (1953-09-01), Mott
patent: 2705456 (1955-04-01), Heyman
patent: 4679986 (1987-07-01), Duere
Kuromitsu Hiromu
Noguchi Noboru
Sugisawa Masakazu
Aisin Seiki Kabushiki Kaisha
Croyle Carlton R.
Olds Ted
Toyota Jidosha & Kabushiki Kaisha
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