Lubricating device of four-stroke cycle engine unit for portable working machine
AssigneeRyobi Ltd.
InventorsYouichi Imagawa, Hiroshi Kohmoto
Life of this patent
Estimating the term…
Abstract
A four-stroke cycle engine unit for a working machine has generally a lubricating device for lubricating mechanical parts in a valve chamber and a cam chamber. The lubricating device comprises a body which has the cam chamber and a crank chamber, a cylinder head and a head cover having the valve chamber, and a mechanism for preventing a lubricating oil from escaping from at least one of through holes for push rods provided in a wall of the valve chamber and the cam chamber.
Claims12
A lubricating device for a four-stroke cycle engine unit for a portable working machine,
- said lubricating device comprising:
- a body having a cam chamber which accommodates a crank gear mounted on a crank shaft, a cam gear meshed with the crank gear and a cam mounted on the cam gear, said body having a crank chamber accommodating a crank mechanism and sealing a lubricating oil;
- a cylinder head means having a valve chamber accommodating rocker arms which are swingable by push rods moving upward and downward through rotation of the cam and which move an exhaust valve and an intake valve in said valve chamber, said valve chamber sealing a lubricating oil;
- and
- a means for preventing escape of the lubricating oil from at least one of through holes for push rods, provided in a wall of the valve chamber and the cam chamber.
A portable working machine provided with a four-stroke cycle engine unit comprising:
- a main body essentially consisting of the four-stroke cycle engine unit;
- said engine unit including a lubricating device said lubricating device comprising:
- a body having a cam chamber which accommodates a crank gear mounted on a crank shaft, a cam gear meshed with the crank gear and a cam mounted on the cam gear, said body having a crank chamber accommodating a crank mechanism and sealing a lubricating oil;
- a cylinder head means having a valve chamber accommodating rocker arms which are swingable by push rods moving upward and downward through rotation of the cam and which move an exhaust valve and an intake valve in said valve chamber, said valve chamber sealing a lubricating oil;
- and a means for preventing escape of the lubricating oil from at least one of through holes for push rods, provided in a wall of the valve chamber and the cam chamber
- a working device driven by the four-stroke cycle engine unit;
- a power transmission shaft member having one end connected to the four-stroke cycle engine unit and another end connected to the working device for transmitting an output power of the four-stroke cycle engine unit to the working device;
- and
- a handle means mounted onto the power transmission shaft member and operated by an operator.
Dependencies are inferred from the claim text.