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

1991-02-28

1992-01-14

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9039, F01L 134

Patent

active

050800540

ABSTRACT:
A main rocker arm which is pivotally mounted on a rocker shaft has a sub-rocker arm pivotally mounted thereon. The main rocker arm is arranged to open and close at least one poppet valve. A hydraulic lash adjuster or adjusters are arranged at the free end of the main rocker arm to reduce valve clearance to zero. The sub-rocker arm can be selectively locked to the main one by way of hydraulically operated plunger arrangement. The main rocker arm is provided with a roller type cam follower which follows a low speed cam. The sub-rocker arm is provided with a follower which engages a high speed cam. The low speed cam follower is arranged to project above the high speed one when the two rocker arms are interlocked so that the low speed cam follower engages the base circle of the low speed cam and a clearance is developed between the high speed cam follower and the base circle of the high speed cam. This eliminates the need for sudden changes in lash adjuster length when the valve train operation switches between high and low speed operation.

REFERENCES:
patent: 4612884 (1986-09-01), Aijki et al.
patent: 4848284 (1989-07-01), Konno
patent: 4854273 (1989-08-01), Uesugi et al.

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