Honda Motor Co., Ltd.

Kazuhisa Ogawa

Hiroaki Hasebe

Akihisa Shinoda

Yoshikazu Sato

Takashi Suzuki

Kazuhiro Sakamoto

Tetsuya Arai

Souhei Honda

Manabu Hashimoto

Hiroshi Koyama

Kentaro Sugimura

Yasushi Fujita

Yoshihiko Kubo

Kouhei Arakawa

An air-cooled general-purpose engine includes: a cooling fan fixed to one end portion, protruding outward from one end wall of an engine main body, of a crankshaft; and a shroud which is mounted to the engine main body, and which defines a cooling-air path between the shroud and the one end wall, the cooling-air path guiding a cooling air blown under pressure from the cooling fan. The air-cooled general-purpose engine includes: an oil pump which pumps up an oil from an oil reservoir; and an oil-supply path which is formed in the one end wall, facing the cooling-air path, of the engine main body, and configured to guide the oil discharged from the oil pump to a valve operating chamber in a head portion of the engine main body, and a jet for jetting the oil is provided in an opening of the oil-supply path, the opening being open to the valve operating chamber. Accordingly, it is possible to be excellent in cooling oil and to preferably lubricate a valve operating system in addition to the surrounding of a crankshaft.

Lubricating system for air-cooled general-purpose engine

In an engine oil filter system in which: a filter-attachment base is joined to one side surface of an engine; and an oil filter which filters lubricating oil supplied to the engine from an oil pump is attached to the filter-attachment base, an oil cooler for cooling down the lubricating oil transferred between the engine and the oil filter is formed integrally with the filter-attachment base. Accordingly, it is possible to provide an inexpensive engine oil filter system which includes an oil cooler constituted by utilizing a filter-attachment base, and which thus eliminates the need to modify an oil filter and also the need to form, on an engine, an attachment portion to which the oil cooler is exclusively attached.

Engine oil filter and cooling system

In a breather device for engine, in which an inlet of a breather chamber communicates with a crank chamber through a reed valve, the reed valve being formed of: a fixed stopper plate arranged so as to be opposed to a valve seat formed on an end face of the inlet facing the breather chamber; and an elastic valve plate fixed at one end thereof to the stopper plate and capable of bending elastically to change its position from a closed position in which the elastic valve plate closes the inlet by seating on the valve seat to an opening limit position in which the elastic valve plate opens the inlet and abuts against the stopper plate, the stopper plate is provided at a center part thereof with an oil discharge hole through which oil present between the elastic valve plate and the stopper plate is pushed out when the elastic valve plate is pushed toward the opening limit position in which the elastic valve plate abuts against the stopper plate by pressure in the crank chamber. Accordingly, it is possible to prevent the elastic valve plate from sticking to the stopper plate even if oil mist adheres to the elastic valve plate or the stopper plate of the reed valve.

Breather device for engine

In a V-type engine in which first and second banks arranged in a V-shape are provided continuously to a crankcase, and in which a carburetor is placed at a valley between the first and second banks, the carburetor is placed spaced from the first and second banks. Further, the carburetor is connected to intake ports of the first and second banks via first and second intake pipes, respectively, and first and second heat shield plates each made of synthetic resin are attached to side faces of the respective first and second banks, the side faces facing the carburetor, each of the first and second heat shield plates covering a corresponding one of the side faces and defining a cooling air passage between the heat shield plate and the side face. Accordingly, it is possible to surely prevent heat from the banks from affecting the carburetor in order to prevent percolation in the carburetor even in the case where the engine stops its operation in a high-temperature state.

V-type engine

An air-cooled engine () is cooled by cooling air (Wi). The air-cooled engine () includes a cylinder block () and a cylinder head (). The cylinder block () has cylinder cooling through-ducts () capable of transmitting cooling air (Wi), on the periphery of a cylinder (). The cylinder head () has a head-cooling through-duct () capable of transmitting cooling air (Wi). The cylinder-cooling ducts () and the head-cooling duct () extend in a direction perpendicular to the axial line () of the cylinder (), and are communicated with each other by means of communication channels ().

Air-cooled engine

An air-cooled engine () has a fan cover () for covering a cooling fan (). The cover () is composed of a fan-cover peripheral wall () for covering the outside of the cooling fan (), and a top board () for closing off one end of the fan-cover peripheral wall (). The fan-cover peripheral wall () has an internally disposed guiding duct () for guiding cooling air (Wi) from the cooling fan () to an engine main body (). A first fastening member () secures a portion of the external part of the fan-cover peripheral wall () that is proximal to the guiding duct () to a casing () of the engine main body (). A second fastening member () extends from the casing () and through the fan-cover peripheral wall (), and secures a top board () in a portion that is at a distance from the guiding duct ().

A fuel tank used for a general-purpose engine comprises a hollow tank body for storing fuel and a filter disposed within the tank body. The tank body has a bottom with a trap having an internal surface portion lying in a first plane. The filter comprises a tubular body extending from the internal surface portion of the trap and a fluororesin element supported by the tubular body so that a main surface of the fluororesin element lies in a second plane disposed at an angle of inclination relative to the first plane. The fluororesin element has a property of not allowing water to pass therethrough but allowing fuel to pass therethrough.

Growing community of inventors

Wako, Japan

Kazuhisa Ogawa