Two-step rocker arm assembly
AssigneeGM Global Technology Operations LLC
InventorKwok Y. Ng
Life of this patent
Estimating the term…
Abstract
A two-step rocker arm assembly is provided having an arm member and a first roller assembly rotatably mounted with respect to the arm member and defining a generally C-shaped opening. A shaft member rotatably supports a second and a third roller assembly. The shaft member extends through the generally C-shaped opening and is selectively translatable therein to guide the second and third roller assemblies with respect to the arm member. A coupling lever is mounted with respect to the shaft member and is operable to selectively retain the shaft member with respect to the arm member for unitary movement therewith.
Claims20
A two-step rocker arm assembly comprising:
- an arm member;
- a first roller assembly rotatably mounted with respect to said arm member and defining a generally curved opening;
- a shaft member;
- a second roller assembly rotatably supported by said shaft member;
- wherein said shaft member extends at least partially into said generally curved opening, said shaft member being selectively translatable within said generally curved opening to guide said second roller assembly with respect to said arm member;
- and
- a coupling lever mounted with respect to said shaft member and operable to selectively retain said shaft member with respect to said arm member for unitary movement therewith.
A valvetrain comprising:
- a camshaft having a low-lift cam and a high-lift cam;
- a two-step rocker arm assembly including:
- an arm member;
- a first roller assembly rotatably mounted with respect to said arm member and defining a generally C-shaped opening;
- a shaft member;
- a second roller assembly rotatably supported by said shaft member;
- wherein said shaft member extends at least partially into said generally C-shaped opening, said shaft member being selectively translatable within said generally C-shaped opening to guide said second roller assembly with respect to said arm member;
- a coupling lever mounted with respect to said shaft member;
- a selectively engageable latch assembly operable to selectively engage said coupling lever to selectively retain said shaft member with respect to said first arm member for unitary movement therewith;
- wherein said low-lift cam is in selective engagement with said first roller assembly and said high lift cam is engaged with said second roller assembly;
- wherein said hi-lift cam is configured to actuate said two-step rocker arm assembly when said latch assembly engages said coupling lever;
- and
- wherein said low-lift cam is configured to actuate said two-step rocker arm assembly when said latch assembly disengages said coupling lever.
A two-step rocker arm assembly for use with an internal combustion engine, the two-step rocker arm assembly comprising:
- an arm member;
- a first roller assembly rotatably mounted with respect to said arm member and defining a generally C-shaped opening;
- a shaft member;
- second and third roller assemblies rotatably supported by said shaft member and disposed on opposite sides of said arm member;
- wherein said shaft member extends through said generally C-shaped opening, said shaft member being selectively translatable within said generally C-shaped opening to guide said second and third roller assemblies with respect to said arm member;
- and
- a coupling lever mounted with respect to said shaft member and operable to selectively retain said shaft member with respect to said arm member for unitary movement therewith.
Dependencies are inferred from the claim text.