Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Koji Kasai

Hiroshi Takahashi

Hideshi Sasaki

Tetsuro Ikeno

Tetsu Wada

Takao Nishida

Shinichi Ide

Keita Ito

Yasuhiro Shimizu

Yasutake Ryu

Takeshi Maeda

Shoji Hasei

Hiroshi Mizuguchi

Hiroaki Uchitani

Takeshi Hashimoto

Hajime Yoshimura

Hideaki Takada

Tatsuya Kuroda

Yoshinori Masubuchi

Yoshihiro Harada

Kohei Matsuzawa

Susumu Okubo

Takahide Konchi

Hiromi Ura

This outboard machine has: a V-type engine (engine) in which a plurality of cylinders are arranged in a V-shape when viewed in a plan view; and a cover that covers the engine. The engine has a plurality of intake ports that form pairs in a V-shape inside the plurality of cylinders in a plan view and a concave space is formed between the plurality of intake ports. The cover has therein an intake path that guides air to the intake port, and is also provided with, at a position that is adjacent to the intake path and enters the concave space, a silencer that attenuates the sound during intake.

Outboard machine

A utility vehicle equipped with a cover displaceably attached to a chassis through a suspension mechanism, each suspension mechanism includes a shaft installed between the chassis and cover, a guide member having a plate member provided on lower half of the shaft and multiple plates installed above and below the plate member to be contactable with the plate member and respectively formed at their centers with through holes for passage of the shaft, a compression spring of roughly frustoconical shape for biasing the cover toward the chassis whose upper seating edge is attached to upper half of the shaft and lower seating edge is attached to periphery of the through hole of the cover, and an elastic member of roughly frustoconical shape formed at its center with a through hole to pass the shaft therethrough, wherein the cover is formed in roughly frustoconical shape similar to the elastic member.

Utility vehicle with spring suspension between cover and chassis

A cutting blade replacement jig for replacing a cutting blade of a utility unit, the cutting blade being attached to a peripheral edge part of a disk by a first fastening member and a second fastening member fastened to the first fastening member, the first fastening member passing through a disk through hole formed in the peripheral edge part and a cutting blade through hole formed in the cutting blade. The cutting blade replacement jig includes: a fastening member holder configured to hold the second fastening member; and a cutting blade holder configured to hold the cutting blade on the second fasting member held in the fastening member holder in a state where a center line of the cutting blade through hole and a center line of the second fasting member are aligned.

Cutting blade replacement jig and method

In a utility vehicle, equipped with a lawnmower work unit having a circular single blade disk rotatable around a rotating shaft connected to an output shaft of a work motor (prime mover) mounted on a chassis, and multiple (three) blades attached to a circumference of the blade disk at equally spaced apart positions, a single second disk is fixed to a middle of the surface of the blade disk of the lawnmower work unit at fixing positions that are spaced apart from each other.

Utility vehicle with noise inhibition

A lawn mower includes: a blade disk rotatable about a rotation shaft extending in an up-down direction; and a plurality of cutter blades mounted on the blade disk. The blade disk includes a plurality of blade mounting sections having corresponding ones of the cutter blades mounted thereon, and a circumferential high-rigidity section for increasing rigidity of the blade disk between the blade mounting sections. The blade mounting sections are located on, and spaced from each other along, an imaginary reference circle concentric with a rotation center of the blade disk, and the circumferential high-rigidity section is located in such a manner as to interconnect the plurality of blade mounting sections along the reference circle, the circumferential high-rigidity section being formed in a generally concave-convex configuration by being depressed and protruded in a facewise direction of the blade disk.

Lawn mower

A blade disk in a lawn mower is rotatable about a rotation shaft extending in an up-down direction. A blade protection section for protecting a cutter blade mounted on the blade disk is provided integrally on the blade disk, and the cutter blade has a distal end portion located beneath the blade protection section.

An outboard motor has an internal combustion engine installed in an engine compartment defined by an engine cover. The engine's intake air inlet is formed by an air intake duct, which communicates with an air intake space outside the engine compartment. The engine cover includes an upper cover with a receiving ring fitted on the air intake duct. The receiving ring and the intake duct form an overlapping part in which the ring and the duct overlap each other in the direction of flow of combustion air. The overlapping part has a sealing member therein which forms a seal between the air intake space and the interior space of the engine compartment. The sealing structure does not require high dimensional precision to form a required sealing property between the engine cover and the air inlet of the engine intake system. The sealing structure minimizes any influence of engine vibrations.

Internal combustion engine installed in engine compartment

An internal combustion engine installed in an engine compartmentcovered with an engine cover C is provided with an intake air passage P. The intake air passage P extends continuously from an intake air inlet Pi to intake air outlets Pe in the engine compartmentand has a first down passage, a reversing passage, an up passageand a second down passagearranged in the order in the flowing direction of combustion air. The combustion air taken through the intake air inlet Pi into the intake air passage P flows down through the first down passage, the reversing passagereverses the flowing direction of the combustion air that has flowed down through the first down passagesuch that the combustion air flows up, flows up through the up passageto a position at a level higher than that of an uppermost intake air outlet Pe. Then, the combustion air flows down through the second down passageand flows through the intake air outlets Pe into combustion chambers. Thus, an effect on preventing the flow of water into the combustion chamberof the engine is improved.

Internal combustion engine and outboard motor provided with the same

An outboard motor S includes an internal combustion engine E having a crankshaft, and an alternator G having a shaftand a housing. The engine E and the generator G are disposed in an engine compartmentwith the crankshaftof the engine E and the shaftof the alternator G spaced a center distance d apart from each other. The housingis provided with air inletsthrough which cooling air for cooling the interior of the alternator G flows into the housingand air outletsthrough which cooling air that has cooled the alternator G is discharged as exhaust air. An exhaust air ductsurrounds the outletsof the housingand carries the exhaust air to a predetermined position from which the exhaust air cannot easily flow again through the inletsinto the housing. The alternator G spaced the center distance apart from the internal combustion engine E can be cooled at improved cooling efficiency.

Machine provided with internal combustion engine and generator

In an outboard motor, an extension case (member constituting a frame of the outboard motor) has the natural frequency (resonance frequency) of higher than the vibration frequency produced when the engine operates at maximum speed. Since this configuration prevents the extension case from resonating during operation of the outboard motor, noise (more specifically, noise produced by the outboard motor) propagated to the outside can be reduced.

Outboard motor

In a shift mechanism for an outboard motor mounted on a stem of a boat and having an internal combustion engine at its upper portion and a propeller at its lower portion that is powered by the engine to propel the boat, having an electric motor installed in the outboard motor, a shift rod rotatably connected to the electric motor, a shifter clutch connected to the shift rod, the shifter clutch being movable by the shift rod from a neutral position to engage with at least one of a forward gear and a reverse gear, and a controller controlling the electric motor to rotate the shift rod such that the shifter clutch engages with the forward gear or the reverse gear, corresponding to an inputted shift instruction made by the operator, there is provided a shock mitigator mitigating shock generated during the shift. The shock mitigator comprises projections formed on the clutch and the forward/reverse gear. Alternatively, the electric motor and its reduction-gear mechanism are accommodated in a case to be located above the shift rod. Further, there is provided an emergency gear that allows the shift rod to be rotated manually to effect shift.

Outboard motor shift mechanism

In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.

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Wako, Japan

Koji Kasai