Variable valve lift system
AssigneeHyundai Motor Company
InventorsJangSu Lee, Hyo Sang Cho, Hyoung Hyoun Kim
Life of this patent
Estimating the term…
Abstract
A variable valve lift system may include a roller finger follower having an end connected with a valve and a roller mounted thereto. A hydraulic lash adjuster supports another end of the roller finger follower and has operating modes which are changed to a high lift mode or a low lift mode according to supplied hydraulic pressure to change a height of the hydraulic lash adjuster. A hydraulic pressure supplying portion supplies the hydraulic pressure to the hydraulic lash adjuster. A cam is mounted to a camshaft and contacts the roller of the roller finger follower. The cam has a first ramp and a second ramp formed thereon.
Claims16
A variable valve lift system comprising:
- a roller finger follower having an end connected with a valve and a roller mounted thereto;
- a hydraulic lash adjuster supporting another end of the roller finger follower and of which operating modes are changed to a high lift mode or a low lift mode according to a supplied hydraulic pressure to change a height of the hydraulic lash adjuster;
- a hydraulic pressure supplying portion supplying the hydraulic pressure to the hydraulic lash adjuster;
- a camshaft;
- and
- a cam mounted to the camshaft and contacting the roller of the roller finger follower and having a first ramp and a second ramp are formed thereto,
- wherein the hydraulic lash adjuster comprises:
- an adjust housing mounted to a cylinder head;
- an adjust unit adjusting a clearance of the valve;
- and
- a connecting portion selectively connecting the adjust unit and the adjust housing, and
- wherein the hydraulic pressure supplying portion includes a drain line communicating with the connection portion and exhausting the hydraulic pressure.
A variable valve lift system comprising:
- a cam mounted to a camshaft and having a first ramp and a second ramp formed on the cam;
- a roller finger follower having an end connected with a valve and a roller, which contacts the cam, mounted thereto;
- a hydraulic lash adjuster supporting another end of the roller finger follower and comprising:
- an adjust housing mounted to a cylinder head;
- an adjust unit adjusting a clearance of the valve;
- and a connecting portion selectively connecting the adjust unit and the adjust housing for changing a height of the hydraulic lash adjuster;
- and
- a hydraulic pressure supplying portion supplying hydraulic pressure to the hydraulic lash adjuster,
- wherein the hydraulic pressure supplying portion includes a drain line communicating with the connection portion and exhausting the hydraulic pressure.
Dependencies are inferred from the claim text.