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Home Heart Surgery Rocker-lever-for-valve-operation-of-an-internal-combustion-engine-with-device-for-automatic-adjustment-readjustment-of-valve-clearance

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Details
Inventors: Kampichler, Gunter;
Assignee: Motorenfabrik Hatz GmbH & Co. (Ruhstorf, DE)
Primary Examiner: Denion; Thomas
Assistant Examiner: Corrigan; Jaime
Attorney, Agent or Firm: Katten Muchin Zavis Rosenman

A pivoting or rotating mounted rocker arm, for a valve train in an internal combustion engine, fitted with a mechanical valve play adjuster element, for the independent setting/adjustment of a first pre-set valve play between rocker arm and valve stem end. The valve play adjuster element comprises a hollow cylinder mounted in the rocker arm in a rotating manner, with planar surfaces (slide patches) formed around the hollow cylinder circumference and a turning spring which turns the slide patches in a predetermined direction. The independent rotation of the slide patches is prevented by contact of the relevant rear surface edge of the planar surface on the valve stem end, so long as a second given valve play is not reached.

DETAILED DESCRIPTION This purpose is accomplished by a rocker according to the construction of the present invention.
According to the invention, the valve clearance adjusting element mentioned in the introduction is characterized in that it comprises a hollow cylinder, placed and able to turn in the rocker, with flat surfaces (a "sliding block") formed about the circumference of the hollow cylinder, and a torsion spring which turns the sliding block in a predetermined direction of rotation.
Adjacent flat surfaces are bounded off from each other by their surface edges.
The torsion spring for turning the sliding block in a predetermined direction of rotation has a much lower spring force than the valve spring which closes the valve, so that the closing of the valve experiences no impairment from a contrary directed force component of the torsion spring.
According to the invention, the sliding block is configured such that the flat surfaces formed about the circumference of the hollow cylinder are each arranged parallel to the axis of the hollow cylinder.
This implies that there is a perpendicular to the hollow cylinder axis for each flat surface.
This perpendicular coincides in its direction with a radial direction of the circular cross section of the hollow cylinder.
According to the invention, the perpendicular through a flat surface to the hollow cylinder axis defines the shortest distance between the flat surface and the hollow cylinder axis.
The flat surfaces have surface edges which are parallel to the hollow cylinder axis (and thus also parallel to each other).
In relation to the turning of the sliding block in a predetermined direction as produced by the torsion spring, the surface edges of each flat surface that are parallel to the axis of the hollow cylinder are to be distinguished as a leading forward surface edge and a trailing rear surface edge.
The sliding block is characterized in that its flat surfaces have increasing shortest distances from the cylinder axis in the direction opposite the predetermined direction of rotation, as well as an increasing radial distance of the corresponding rear surface edges from the cylinder axis


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