Braking device for four-stroke cycle reciprocating piston intern

Details Braking device for four-stroke cycle reciprocating piston intern Braking device for four-stroke cycle reciprocating piston intern

1977-12-27

1979-11-20

Lazarus, Ronald H.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 97B, 123 98, F02L 902, F02D 3100

Patent

active

041746872

ABSTRACT:
A braking device for four-stroke cycle reciprocating piston internal combustion engines, especially vehicle engines, which for controlling at least each outlet valve include a hydraulically operable driving cylinder-piston unit adapted to be actuated by a camshaft, and a working cylinder-piston unit connected through at least one control conduit with the driving cylinder-piston unit and operable to actuate the outlet valve. The working cylinder-piston unit has a two-step different diameter cylinder and two plungers of correspondingly different diameters reciprocating relative to each other in the two-step cylinder. The braking device also includes a control member, e.g., a valve spool, common to all control conduits, for selectively connecting the control conduits to and disconnecting them from different driving cylinder-piston units and working cylinder piston units to thereby establish or interrupt connection between different driving cylinder-piston units with different working cylinder-piston units. The larger plungers only of the two plungers of the working cylinder-piston units are adapted to be acted upon by pressure fluid to reduce the opening stroke of the discharge valves.

REFERENCES:
patent: 1696984 (1929-01-01), Trbojevich
patent: 1903328 (1933-04-01), Noble
patent: 3220392 (1965-11-01), Cummins
patent: 3534718 (1970-10-01), Pasquin

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