Push rod cover arrangement for engines

Details Push rod cover arrangement for engines Push rod cover arrangement for engines

1999-10-12

2001-01-23

Lo, Weilun (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rod

C123S090380, C123S1950HC

Reexamination Certificate

active

06176211

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates an internal combustion engine having push rod operated overhead valves and more particularly to a push rod cover for such engine.
In many instances, it is desirable to employ push rod operated rather than directly operated overhead valves. Where this is done, the valve is operated through a rocker arm from a remotely positioned camshaft by means of a push rod and at times a tappet that actuates the push rod. With this type of mechanism, it is desirable to provide an arrangement wherein the actuating mechanism that interconnects the camshaft to the rocker arm can be conveniently accessed. Normally, however, the push rods are disposed in such an orientation that each must be accessed separately.
It is, therefore, a principal object of this invention to provide an improved engine construction wherein a plurality of push rods that operate respective rocker arms are disposed so that they all lie within a common cavity and that this cavity can be accessed through removal of a cover that will afford access to the push rods and, if desired, the associated tappets.
It is, therefore, a still further object of this invention to provide an improved, simple and yet accessible engine construction for engines embodying push rod operated overhead valves.
The problems aforenoted are particularly acute in conjunction with engines which are air cooled. As is well known, the external surface of major engine body components of air cooled engines are formed with a plurality of outwardly extending cooling fins. If the engine valves are push rod operated, this finning of the outer body components may make it difficult to access the push rods for servicing.
Therefore, many engines that are air cooled and are provided with push rod operated valves position the push rods externally of the engine body. Then in order to protect the push rods and improve the appearance, they are contained within individual, externally positioned tubes. This not only increases the size and cost of the engine, but also makes it less attractive in appearance and more prone to potential damage, particularly with application in vehicles where the engine is exposed, such as motorcycles.
It is, therefore, a still further object of this invention to provide an improved engine construction for a push rod operated internal combustion engine as utilized in powering a vehicle such as a motorcycle.
SUMMARY OF THE INVENTION
This invention is adapted to be embodied in a push rod type overhead valve internal combustion engine that is comprised of an engine body consisting of a cylinder head portion, a cylinder block portion and a crankcase portion. A crankshaft is rotatably journaled within the crankshaft portion. At least one poppet valve is supported for reciprocation in the cylinder head portion for valving the flow through a port therein. A rocker arm is pivotally supported in the cylinder head portion for operating the poppet type valve. A camshaft is driven by the crankshaft and journalled for rotation within the crankcase portion about a rotational axis parallel to that of the crankshaft. A recess is formed in a side of the engine body extending from the crankshaft portion through the cylinder block portion into the cylinder head portion. A push rod is received within this recess and transmits motion from a cam lobe on the camshaft to the rocker arm. A single piece cover is detachably connected to the engine body for closing the recess in the side of the engine body assembly.


REFERENCES:
patent: 2970584 (1961-02-01), Wunsche et al.
patent: 3038459 (1962-06-01), Schmid
patent: 3048156 (1962-08-01), Van Slooten
patent: 5492085 (1996-02-01), Tiller et al.
patent: 5983849 (1999-11-01), Wangen et al.

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