89 results about "Air-cooled engine" patented technology

A surface cooler comprises a plate-like layer and a plurality of spaced-apart fins extending substantially perpendicular from an uppermost layer of the plate-like layer. The plurality of fins defining a plurality of air flow paths. The plurality of spaced-apart fins are configured to augment heat transfer of the surface cooler by increasing the turbulence levels of a fluid flowing through the airflow paths by promoting increased mixing with a resulting increase in the heat transfer coefficient of the surface cooler. A method of forming the surface cooler and an engine including the surface cooler.

An oil cooling system of an air-cooled engine for cooling the oil reserved in a crankcase of the engine comprises a base plate assembled to the crankcase, an overlapping plate assembled to the base plate; an oil filter supported in the overlapping plate; and radiation fins formed on the base plate and the overlapping plate, wherein the base plate includes an inlet port for receiving the engine oil discharged from an oil pump of the engine, an outlet groove for outputting the engine oil and a first passage groove connecting the inlet port and the outlet groove, the overlapping plate includes an inlet groove opposed to the inlet port, an outlet port opposed to the outlet groove and a second passage groove opposed to the first passage groove to form an oil passage together with the first passage groove, and the base plate and the overlapping plate having through-holes where the filter outlet of the oil filter passes through for the connection with the crankcase.

The purpose of the present invention is to improve cooling efficiency of a cylinder head of an air-cooled engine.

With regard to the construction that a cooling fan is provided at one of ends of a crankshaft, and cooling air from the cooling fan is guided to a cylinder head 4 so as to cool the cylinder head 4, an intake manifold 8 is arranged above the cooling fan, a duct 51 is provided at the lateral center of the intake manifold 8 so as to suck air from an air cleaner, cooling air is sent from both sides of the duct 51 to an intake valve, an exhaust valve and an injection nozzle arranged in the cylinder head 4, and a shielding plate 55 is provided at one of lateral sides of the duct 51.

There is provided an air-cooled engine (10) that is cooled by cooling air. The air-cooled engine (10) comprises a cylinder block (33), and a cylinder head (28) that closes off one end of a cylinder (26). The cylinder head (28) includes a base part (81) that is superposed on and secured to the cylinder block (33) by a plurality of bolts (91), and a valve compartment (83) formed integrally on the base part (81). All of the bolts (91) are disposed near the outer periphery of the base part (81) at positions outside of the valve compartment (83).

A cooling structure for a working vehicle with a transmission disposed rearwardly and downwardly of a driver's seat and having a hydrostatic transmission, and an air-cooled engine disposed rearwardly of the transmission. The cooling structure comprising a fan for cooling the engine and a fan for cooling the transmission mounted on a rotary shaft operatively connecting the transmission with an output shaft of the air-cooled engine, the fans being configured such that air flows generated by the fans move from adjacent the transmission toward the engine; an oil cooler for cooling fluid supplied to the hydrostatic transmission, the oil cooler being disposed between the fan for cooling the engine and the fan for cooling the transmission, and disposed to face each of the fans; and an air guiding plate disposed at a position higher than the oil cooler for guiding air to regions of the fans.

A throttle body 12 is connected to a rear portion of a cylinder head 10 of an air-cooled engine 5, and a fuel pump 23 is disposed in front of the engine 5. The fuel pump 23 is such as to be disposed below a fuel tank 6 in such a manner as to be separated therefrom and to be integrated with an auxiliary tank. Fuel is sent under pressure from the fuel pump 23 to the throttle body 12 via a fuel feed tube 13, and surplus fuel is returned to the integrated auxiliary tank, consequently, no piping for return fuel being required. Vapor generated in the fuel pump 23 returns to a space above a fuel level resulting when the fuel tank 6 is filled up via an exclusive return tube 25 and is, therefore, prevented from mixing into fuel.

A general purpose engine with a cleaning access window defined therein is in the form of an air cooled engine, having a cylinder unit made up of a cylinder and a cylinder head, and includes a housing for covering at least the cylinder unit and a cleaner covering removably fitted to the housing for covering the filter section of the air cleaner, the housing being formed with a blow window so as to confront gaps between a plurality of cooling fins provided in the cylinder unit, and the cleaner covering has a closing section defined therein for covering the blow window.

The invention discloses an engine combined-cooling system on a small single-rotor-wing unmanned helicopter. The engine combined-cooling system comprises a cylinder A, a water cooled jacket A, a cylinder B, a water cooled jacket B, a water cooling evaporator, a water storage tank and a water pump. When a double-cylinder-oppositely-arranged type air cooled engine works, cooling water enters an annular water cavity A through a water inlet connector of the water cooled jacket A, absorbs heat of the cylinder A and is then drained out through a water outlet connector of the water cooled jacket A; the drained cooling water enters an annular water cavity B through a pipe and a water inlet connector of the water cooled jacket B, absorbs heat of the cylinder B, is then drained out through a water outlet connector of the water cooled jacket B, enters the water cooling evaporator through a pipe and is forcedly cooled through wind generated by a propeller and wind generated by flight; and the cooled water then enters the annular water cavity A through a hose, the water storage tank, a hose, the water pump, a hose and the water inlet connector of the water cooled jacket A in sequence and circulates according to the above path.

In a multi-blade fan for an air-cooled engine, by defining the inlet angle β1 and the angle β′2 to make the sum thereof less than 80° (preferably defining β1 as 32° and β′2 as 36°), the multi-blade fan achieves greater air volume than in the case where the sum is made 80° or greater, where β1 is the angle between the relative velocity direction and the peripheral direction on the inlet side of the blades,β2 is the angle between the relative velocity direction and the peripheral direction on the outlet side of the blades, and β′2 is the difference obtained by subtracting β2 from 180°. The number of blades can therefore be reduced to realize lower noise level while still maintaining the same air volume as the prior art multi-blade fan.

The invention discloses a casting method of an air-cooled engine cylinder. The casting method comprises the following steps: processing an inner die casting mould of an air-cooled engine cylinder sleeve; processing an outer die casting mould of the air-cooled engine cylinder sleeve; placing the inner die casting mould into the outer die casting mould, assembling and forming a double-layered mould; pouring metal liquid at 1300-1400 DEG C to the double-layered mould, rotating the double-layered mould along the horizontal axial direction to generate a centrifugal force, so that the metal liquid is fully filled in the double-layered mould; controlling time of adding water and cooling time; when set time of adding the water and the set cooling time are reached, adding the water to cool the double-layered mould; taking out a cooled inner die casting mould; obtaining the air-cooled engine cylinder sleeve. The casting method disclosed by the invention is simple in technique, high in utilization rate of molten iron, good in product quality, and high in yield.

The invention discloses a motorcycle engine oil cooling and lubricating system. A cylinder end right cover (6) is provided with a right cover oil inlet hole (6a) and a right cover oil outlet hole (6b), the inlet of the right cover oil inlet hole (6a) is communicated with the outlet of a cylinder oil inlet hole (13), the outlet of the right cover oil inlet hole (6a) is connected with an oil cooling radiator oil inlet pipe (14) which is connected with the inlet of an oil cooling radiator (15), the outlet of the oil cooling radiator (15) is connected with an oil cooling radiator oil outlet pipe (16), and the oil cooling radiator oil outlet pipe (16) is connected with the inlet of the right cover oil outlet hole (6b). The motorcycle engine oil cooling and lubricating system can directly convert the cooling manner of an engine from an air cooling mode to an oil cooling mode without large-area structural modification and part replacement of an existing air cooled engine, solves the problem that the cooling mode of a traditional motorcycle air cooled engine cannot be directly expanded in the later period, and greatly reduces the usage cost of the oil cooled engine.

A head for an air-cooled engine having at least two cylinders, each cylinder having a longitudinal axis, the head having a rocker arm mounted to rotate about a rocker arm axis in the head, the head further including an intake port and an exhaust port, and the head mounted on a first cylinder of the two cylinders to define a combustion chamber, the head having at least two fins, each fin having a height-to-thickness ratio of greater than or equal to 5, each fin having a length that is at least 5 times the distance between the at least two fins at a location on the head that is between the first cylinder and the rocker arm axis on the head, and each fin positioned on the head with the fin length oriented along an axis that is substantially parallel to the longitudinal axis of the first cylinder.

An air-cooled engine (10) cooled by cooling air (Wi). The air-cooled engine (10) includes a cylinder block (33) and a cylinder head (28). The cylinder block (33) has cylinder cooling passages (101, 102) capable of transmitting cooling air (Wi) on the outer periphery of the cylinders (26). The cylinder head (28) has cylinder head cooling ducts (104) capable of conveying cooling air (Wi). The cylinder cooling passage (101, 102) and the cylinder head cooling passage (104) extend in a direction perpendicular to the axis (109) of the cylinder (26), and communicate with each other through connecting passages (105, 105).