US 10,590,810 B2 · Lash adjustment in lost motion engine systems

Abstract

Systems for valve actuation in internal combustion engines provide configurations for hydraulic lash adjusters and valve actuation valvetrain components that are particularly suitable for prevention of HLA jacking in lost motion cam environments and in valve bridge environments. In one implementation, a rocker arm may transmit motion from a lost motion cam having main event and auxiliary event lobes. Main event motion is transmitted to two engine valves through the rocker arm, a lash adjuster, lash adjuster loading component and valve bridge, which define part of a first load path. Braking motion is transmitted to one of the engine valves through an inboard valve actuator and bridge pin, which define part of a second load path. The HLA is thus disposed in a separate load path from the braking valve load and the lash adjuster loading component keeps the lash adjuster under a constant compressive force to prevent jacking.

Claims20

Dependent claims

An apparatus for actuating at least one of two or more engine valves in an internal combustion engine, comprising:

a valve bridge operatively associated with the two or more engine valves;
a rocker arm for transmitting motion from a motion source to the valve bridge through a first load path;
a valve actuator for transmitting motion from the motion source to one of the two or more engine valves through a second load path;
a lash adjuster disposed in the first load path;
a lash adjuster loading assembly disposed in the first load path and adapted to prevent overextension of the lash adjuster when the valve actuator transmits motion to the one engine valve.

2 more elements

Dependencies are inferred from the claim text.

Lash adjustment in lost motion engine systems

Life of this patent

Lash adjustment in lost motion engine systems

Life of this patent

Abstract

Claims20