Electro-hydraulic adjusting device

Details Electro-hydraulic adjusting device Electro-hydraulic adjusting device

1996-08-05

1997-04-01

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 74568R, 464 2, 464160, 91417R, 91524, F01L 134, F15B 1116, F15B 1122

Patent

active

056156480

ABSTRACT:
The electrohydraulic adjusting device for actuating a device for adjusting at least one camshaft of an internal combustion engine relative to its crankshaft has two differential pistons each of which serves to adjust a camshaft (intake camshaft or exhaust camshaft). Each of the two differential pistons have a small effective piston surface which is acted upon with pressure by a pump. An independent pressure control valve is associated with each of the pressure chambers on a larger effective piston surface, via which valve, the pressure in this pressure chamber can be controlled independently of the other differential piston.

REFERENCES:
patent: 3896704 (1975-07-01), Barud et al.
patent: 3967534 (1976-07-01), Cryder et al.
patent: 4768420 (1988-09-01), Korthaus
patent: 5170756 (1992-12-01), Szodfridt
patent: 5421294 (1995-06-01), Ruoff et al.

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