High performance overhead valvetrain assembly
View Patent ↗A high performance overhead valvetrain assembly includes a hydraulic lash adjuster which is received within and supports a trunnion. The trunnion, in turn, is received within a cylindrical passageway in one end of a rocker arm. The opposite end of the rocker arm engages a valve stem. Between the trunnion and the valve stem is a roller adapted the engage a cam of a camshaft. The trunnion stabilized rocker arm permits significantly increased valve lift and improved engine performance.
1. An overhead valvetrain assembly comprising in combination,
a lash adjuster assembly having a pair of ends and an alignment pin, wherein said alignment pin extends from said lash adjuster assembly,
a trunnion having a transverse opening for receiving one of said ends of said lash adjuster, and
a rocker arm defining a passageway for receiving said trunnion, a cam follower rotatably disposed in said rocker arm and a surface for engaging and translating a valve.
2. The overhead valvetrain assembly of claim 1 further including anti-friction bearings disposed in said passageway between said trunnion and said rocker arm.
3. The overhead valvetrain assembly of claim 1 wherein said trunnion defines an outer surface and said outer surface is hard coated.
4. The overhead valvetrain assembly of claim 1 further including an antifriction bearing in said cam follower and a stub shaft in said antifriction bearing.
5. The overhead valvetrain assembly of claim 1 wherein said lash adjuster assembly includes an outer cylindrical housing defining said one of said ends and an interior region and a hydraulic lash adjuster disposed in said interior region.
6. The overhead valvetrain assembly of claim 1 wherein said lash adjuster assembly includes a stanchion.
7. An improved valvetrain assembly comprising, in combination,
a rocker arm having a first end adapted to engage a valve stem,
a second end defining a transverse passageway,
a cam follower rotatably supported between said ends,
a trunnion disposed in said passageway and defining a radial opening,
a support received within said radial opening of said trunnion, and
a hydraulic lash adjuster received within said support, wherein said support is a sleeve for receiving said hydraulic lash adjuster, and wherein said support is configured to be slidably received by a cylinder head.
8. The improved valvetrain assembly of claim 7 wherein said support includes means for inhibiting rotation.
9. The improved valvetrain assembly of claim 8 wherein said trunnion defines an outer surface, said passageway defines an inner surface and one of said surfaces is hard coated.
10. The improved vavletrain assembly of claim 7 further including a stub shaft mounted to said rocker arm and an antifriction bearing disposed on said stub shaft and rotatably supporting said cam follower and wherein said passageway and said stub shaft define parallel, spaced-apart axes.
11. The improved valvetrain assembly of claim 7 further including anti-friction bearings disposed in said passageway between said trunnion and said rocker arm.
12. The improved valvetrain assembly of claim 7 wherein said support defines a fixed length.
13. The improved valvetrain assembly of claim 7 further including a hydraulic lash adjuster disposed in said support and a moveable element disposed between said lash adjuster and said support.
14. A high performance valvetrain assembly comprising, in combination,
a support member adapted for disposition in a cylinder head, wherein said support member has an engageable end,
a hydraulic lash adjuster received by said support member, wherein said support member is a sleeve for receiving said hydraulic lash adjuster;
a trunnion defining an axis of rotation and a radially oriented opening receiving said engageable end of said support member, and
a rocker arm having an opening for receiving said trunnion,
a surface adapted to engage an end of a valve and a cam follower rotatably mounted to said arm between said opening and said surface.
15. The high performance valvetrain assembly of claim 14 wherein said support member is a stanchion.
16. The high performance valvetrain assembly of claim 14 wherein said support member includes means for inhibiting rotation of said support member relative to the cylinder head.
17. The high performance valvetrain assembly of claim 14 further including an antifriction bearing disposed in said cam follower and a stub shaft disposed in said bearing and mounted in said arm.
18. The high performance valvetrain assembly of claim 14 further including anti-friction bearings disposed in said passageway between said trunnion and said arm.
19. The high performance valvetrain assembly of claim 14 wherein said trunnion defines an outer surface, said opening defines an inner surface and one of said surfaces is hard coated.