Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1999-06-02
2000-10-10
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9037, F01L 1300
Patent
active
061290629
ABSTRACT:
In a camshaft phase changing apparatus for an internal combustion engine, a plurality of sealed surfaces are formed between an inner peripheral surface of a predetermined hole (a retaining hole formed in an engine cylinder block) present between respective annular hydraulic introducing grooves and an outer peripheral surface of a valve body of an electromagnetic type hydraulic control valve and a length of one of the sealed surfaces having a first difference in pressure is set to be longer than that of the other of the sealed surfaces having a second difference in pressure, the first difference in pressure being larger than the second difference in pressure. In the embodiment, an axial length (S1, S1) of each of the one of the sealed surfaces is set to be longer than that (S2, S2) of each of the others of the sealed surfaces.
REFERENCES:
patent: 5483930 (1996-01-01), Moriya et al.
patent: 5669343 (1997-09-01), Adachi
patent: 5797363 (1998-08-01), Nakamura
patent: 5816205 (1998-10-01), Moriya
patent: 6024061 (2000-02-01), Adachi et al.
Lo Weilun
Unisia Jecs Corporation
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