Fuel pump having dual profile cam ring for driving low and high

Details Fuel pump having dual profile cam ring for driving low and high Fuel pump having dual profile cam ring for driving low and high

1997-06-26

1999-03-30

Thorpe, Timothy S.

Pumps

Successive stages

Reciprocating rigid stages

417265, 417266, F02M 4110

Patent

active

058880542

ABSTRACT:
A novel fuel pump arrangement comprises cam driven low and high pressure reciprocating plunger pump units. The fuel pump has rotary drive means, a high pressure pump with a pump body which defines a pumping chamber with an annular arrangement of a plurality of pairs of bores extending radially outwardly from a cam axis. A pumping plunger is mounted in each pumping plunger bore for reciprocation. The fuel pump also comprises a single transfer pump for transferring fuel under pressure to the pumping chamber. This transfer pump includes a single transfer plunger mounted within a transfer plunger bore for reciprocation to provide alternating intake and transfer phases of operation of the transfer pump. The fuel pump further includes an annular cam ring surrounding the high pressure pump body such that the cam ring is rotatable about the cam axis by the rotary drive to thereby cause reciprocation of the transfer plunger in predetermined synchronization with the high pressure pump whereby fuel is intermittently delivered for transfer to the high pressure pump.

REFERENCES:
patent: 2064750 (1936-12-01), Hurst
patent: 3071074 (1963-01-01), Bessiere
patent: 4173959 (1979-11-01), Sosnowski et al.
patent: 4652220 (1987-03-01), Mowbray
patent: 4889096 (1989-12-01), Brunel
patent: 5228844 (1993-07-01), Klopfer et al.
patent: 5318001 (1994-06-01), Djordjevic
patent: 5688110 (1997-11-01), Djordjevic
Diesel Fuel Injection, published by Robert Bosch GmbH, 1 Jun. 1994, pp. 69-72.
International Search Report for International Application No. PCT/US96/08132.

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