Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1995-01-30
1995-09-26
Yuen, Henry C.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9044, F01L 1300, F01L 118
Patent
active
054526949
ABSTRACT:
A camshaft supported in an engine cylinder head structure has a low speed (lift) cam lobe and a high speed (lift) cam lobe. A rocker arm is supported by a hydraulic lash adjuster or a rocker shaft for pivotal motion and has a sub-rocker shaft and a pin. The rocker arm is drivingly engages the low lift cam lobe. A free cam follower is supported by the sub-rocker shaft and drivingly engages the high lift cam lobe. A latch lever supported by the pin has a latch position wherein one end portion of the latch lever is in locking engagement with the free cam follower and a latch release position wherein the one end portion of the latch lever is out of engagement with the free cam follower. A hydraulic piston received in bore is in driving engagement with the opposite end portion of the latch lever to urge the latch lever against a latch lever release spring towards the latch position thereof. Hydraulic fluid communication between the bore and a hydraulic fluid passage of the cylinder head structure is established through the hydraulic lash adjuster or the rocker shaft.
REFERENCES:
patent: 5183015 (1993-02-01), Morita et al.
patent: 5297516 (1994-03-01), Hara
patent: 5386806 (1995-02-01), Allen et al.
Lo Weilun
Unisia Jecs Corporation
Yuen Henry C.
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