Valve drive having a rocker arm
AssigneeAndreas Stihl AG & Co. KG
InventorManfred Rabis
Life of this patent
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Abstract
A valve drive mechanism is provided that has a rocker arm that by means of a swivel joint is movable about a pivot axis that extends transverse to the rocker arm. A control unit serves to actuate one end of the rocker arm, the other end of which actuates a poppet valve. A guide element, which is disposed between the end of the valve stem of the poppet valve and the other end of the rocker arm, serves to secure the position of the other end of the rocker arm relative to the valve stem end. The guide element is separate from the rocker arm and valve stem, and the other end of the rocker arm comes to rest between abutment surfaces of the guide element.
Claims12
A valve drive mechanism comprising:
- a rocker arm that by means of a swivel joint is movable about a pivot axis that extends transverse to the rocker arm;
- a poppet valve having a valve stem , wherein a second end of said rocker arm acts upon an end of said valve stem;
- a control unit that engages a first end of said rocker arm for actuating said poppet valve;
- and
- a guide element that is disposed between said valve stem end and said second end of said rocker arm, wherein said guide element is separate from said rocker arm and is a part of a valve spring retainer that is disposed on said valve stem, wherein said guide element is provided with oppositely disposed abutment surfaces that extend transverse to a longitudinal axis of said poppet valve, and wherein said second end of said rocker arm is disposed between said abutment surfaces of said guide element such that the position of said second end of said rocker arm is secured relative to said end of said valve stem.
Dependencies are inferred from the claim text.