Handheld type four-cycle engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKeita Ito, Takao Nishida, Sei Watanabe
Life of this patent
Estimating the term…
Abstract
With regard to a handheld type four-cycle engine including, in a side wall of a cylinder block, an intake valve, an exhaust valve and a valve operation mechanism operable in association with a crankshaft so as to open and close the above-mentioned valves and, an oil tank is formed in one side wall of the cylinder block, and the oil tank houses the valve operation mechanism and oil mist generation means for generating an oil mist from stored oil. It is thus possible to reliably lubricate the valve operation mechanism regardless of the operational position of the engine while allowing the size and weight of the engine main body to be reduced.
Claims6
A handheld side-valve type four-cycle engine including:
- a crankcase having a crank chamber housing a crankshaft;
- a cylinder block having a cylinder bore;
- and
- an intake valve, an exhaust valve and a valve operation mechanism provided in a side wall extending along the crankcase and the cylinder block, the valve operation mechanism being operable in association with the crankshaft so as to open and close the intake valve and the exhaust valve;
- wherein an oil tank for storing oil is provided in said side wall extending along the crankcase and the cylinder block, the oil tank houses therein the valve operation mechanism and oil mist generation means for generating oil mist from the stored oil, and said intake and exhaust valves project partly into said oil tank.
A handheld side-valve type four-cycle engine including:
- a crankcase having a crank chamber housing a crankshaft;
- a cylinder block having a cylinder bore;
- and
- an intake valve, an exhaust valve and a valve operation mechanism provided in a side wall extending along the crankcase and the cylinder block, the valve operation mechanism being operable in association with the crankshaft so as to open and close the intake valve and the exhaust valve;
- wherein an oil tank for storing oil that is separate from the crank chamber is provided in said side wall extending along the crankcase and the cylinder block and said intake and exhaust valves project partly into said oil tank, the oil tank houses therein the valve operation mechanism and oil mist generation means for generating oil mist from the stored oil and is arranged so that the oil mist generated inside the oil tank can be supplied to the crank chamber, a cooling fan driven by the crankshaft is placed so as to adjoin the oil tank, and a power output mechanism is provided on the crankshaft so that the crankcase is interposed between the power output mechanism and the oil tank.
Dependencies are inferred from the claim text.