Fully variable mechanical valve train in an internal combustion engine
AssigneeFEV Engine Technology
InventorPeter Hofbauer
Life of this patent
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Abstract
A variable mechanical valve train for actuating a valve in an internal combustion engine includes a two-part follower operatively coupled between a cam shaft and a valve, so that the follower: in a fully-activated mode, causes a maximum lift of the valve in response to a rotation of the cam shaft; in a partial load mode, collapses partially so as to cause a partial valve lift during the rotation of the cam shaft; and in a deactivated mode, collapses in response to the rotation of the cam resulting in no valve lift.
Claims17
A variable mechanical valve train for actuating a valve in an internal combustion engine, said valve train comprising:
- a two-part follower operatively coupled between a cam shaft and a valve, so that the follower:
- in an activated mode, causes a maximum lift of the valve in response to a rotation of the cam shaft;
- in a partial load mode, collapses partially so as to cause a partial valve lift during the rotation of the cam shaft;
- and in a deactivated mode, collapses in response to the rotation of the cam resulting in no valve lift,
- wherein the two-part follower includes a first follower arm and a second follower arm pivotally coupled to each other at a first pivot,
- wherein the first follower arm is pivotally coupled to the engine at a second pivot,
- wherein the second follower arm is mechanically coupled to the valve by a gliding element, and
- including a cam follower rotatably coupled at the first pivot and rollingly engaged with the cam shaft.
A variable mechanical valve train for actuating a valve in an internal combustion engine, said valve train comprising:
- a two-part follower operatively coupled between a cam shaft and a valve, so that the follower:
- in an activated mode, causes a maximum lift of the valve in response to a rotation of the cam shaft;
- in a partial load mode, collapses partially so as to cause a partial valve lift during the rotation of the cam shaft;
- and in a deactivated mode, collapses in response to the rotation of the cam resulting in no valve lift,
- wherein the two-part follower includes a first follower arm and a second follower arm pivotally coupled to each other at a first pivot,
- wherein the first follower arm is pivotally coupled to the engine at a second pivot, and
- wherein the second pivot is located on an actuated end of a lash adjuster.
A variable mechanical valve train for actuating a valve in an internal combustion engine, said valve train comprising:
- a first follower arm having one end pivotally connected to said engine about a first pivot point and a cam follower mounted to its other end about a second pivot point,
- an elongated second follower arm having one end pivotally connected to said cam follower at said second pivot point and mechanically coupled to the valve at its other end, and
- an actuator lever pivotally connected to said second follower arm at a third pivot point,
- wherein the pivotal position of said actuator lever around said third pivot point varies the magnitude of actuation of the valve.
Dependencies are inferred from the claim text.