Rocker arm arrangement for variable timing valve train

Details Rocker arm arrangement for variable timing valve train Rocker arm arrangement for variable timing valve train

1990-10-31

1991-08-27

Okonsky, David A.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9039, F01L 134

Patent

active

050424378

ABSTRACT:
A variable valve timing type rocker arm arrangement is arranged so that, in the absence of sufficient hydraulic pressure to operate the interlocking mechanisms which switch the valve lift control from one cam follower to another, it defaults to a cam follower suited for low speed engine operation rather than one which is adapted to maximize fuel economy. During engine starts (when oil pump output is inherently low) the initial low speed cam follower defaulting improves aspiration and reduces the tendency for incomplete combustion to induce the formation of smoldering deposits on the spark plug electrodes. In the event of an actual hydraulic system malfunction, the defaulting enable the engine to produce enough torque to render the vehicle drivable.

REFERENCES:
patent: 4768467 (1988-09-01), Yamada et al.
patent: 4799463 (1989-01-01), Konno
patent: 4883027 (1989-11-01), Oikawa et al.
patent: 4887563 (1989-12-01), Ishida et al.
patent: 4899701 (1990-02-01), Inoue et al.

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