Honda Giken Kogyo Kabushiki Kaisha

Noboru Kurata

Kuniyuki Yamamoto

Kunio Miyazaki

Urataro Asaka

Masanori Masumura

Hiroshi Murakami

Goroei Wakatsuki

Kenichi Noda

Toshifumi Ito

Mikihiro Koyama

An output shaft is disposed in parallel relation to an engine crank shaft. The output shaft is formed with a gear portion. A first drive shaft is formed with another gear portion which is meshed with the gear portion formed on the output shaft, and disposed in the longitudinal direction intersecting the output shaft at right angle. The first shaft is adapted to transmit power to either ones of front and rear wheels. The output shaft and the first drive shaft are supported on a case. The case is detachably attached to an internal combustion engine. A second drive shaft is supported on an extension of the first drive shaft, and connected to the first drive shaft. The second drive shaft is adapted to transmit power to the remaining wheels of the front and the rear wheels. Due to the foregoing arrangement, both the front and rear wheels are simultaneously driven by one engine output shaft.

Power transmission device of four wheel drive vehicle

A vehicle having driving wheels both on the left and right sides of the chassis frame thereof. The vehicle has a power unit including an engine and a transmission system for transmitting the power from an output shaft of the engine to the driving wheels independently. The power unit has a casing constructed as a rigid member supporting the driving wheels and rockably connected through a pivot shaft to the chassis frame so as to permit vertical movement of the driving wheels. The vehicle also includes a differential gear having a case connected to the output shaft. The transmission system includes a left and a right input sections extending from a left and a right side gears of the differential gear and output sections through which the input sections are drivingly connected to respective driving wheels. The output sections include V-belt type automatic transmissions.

Vehicle drive system

A motorcycle engine having a tensioning mechanism for a cam chain. The mechanism includes a guide on the slack side of the chain which is controlled by two spaced pivotally-mounted links. One of the two links is biased by a spring to tension the cam chain. A sliding rod mechanism prevents facile motion of the links to lessen tension in the cam chain while allowing free tightening. The links are of such proportional extent that the end of the guide nearest the driving sprocket provides the tensioning motion while the end of the guide adjacent the driven sprocket remains tangent thereto.

Chain tensioner

A power transmission casing apparatus in a motorized two-wheeled vehicle which comprises a case main body extending from one lateral side of an internal combustion engine to one lateral side of a rear wheel in rear thereof and supporting rotatably a wheel axle of the rear wheel. The case main body is applied with a cover member for containing therein liquid-tightly a reduction gear means, and is applied with another cover member for containing therein a V-belt means.

Power transmission casing apparatus in motorized two-wheeled vehicle

A sealing structure of a rotary valve in an internal combustion engine in which a recess is formed either at an opening portion of a rotary valve proper or at an opening portion of a combustion chamber in a housing and in which a seal member slidably fitted in the recess is resiliently pushed against the opposing part by means of a spring member. An annular resilient member is interposed between the lower surface of the seal member and the opposing bottom surface of the recess in such a manner that the two ends of the resilient member are respectively in contact with the surfaces of the seal member and the recess. Thereby, the contact pressure at the ends of the resilient member is increased by utilizing the gas pressure in the combustion chamber. Further, the pushing force of the seal member against the opposing part is increased, so as to enhance sealing efficiency.

Sealing structure of a rotary valve in an internal combustion engine

A lubrication apparatus for an internal combustion engine is provided which has a crank chamber with an oil pan detachably mounted on the lower surface of the crank chamber. An oil pump and an oil filter are coupled together by an oil passage in the crank chamber. A relief valve is provided in the oil passage, the relief valve being opened by an oil pressure above a predetermined value. The oil passage includes an opening directed towards the oil pan and the oil pan includes a rib formed on the upper surface thereof, wherein the relief valve is inserted in the opening and is supported therein by the rib.

Lubrication apparatus in internal combustion engine

A rotary valve in an internal combustion engine in which the rotary valve proper is formed so as to be hollow and cylindrical and arranged in such a manner that its inner space forms a portion of an intake passage and a portion of an exhaust passage, which portions are separated from each other. In this manner, the valve proper, exhaust passage, and a housing are effectively cooled, and sealing for the rotary valve proper is made effectively and positively.

Rotary valve in an internal combustion engine

A method of bevelling the peripheral edges of port openings on the inner wall of cylinders for two-cycle engines. At least the upper and lower edges of the port opening on the inner wall of a cylinder are shaped, in advance when casting the cylinder, into concavities arcuately recessed in both axial and radial directions of the cylinder. The boundary edges between the recessed concavities and the inner wall of the cylinder are lightly bevelled by pressing or grinding so that an excellent workability, mass-productivity, and great precision can be attained.

Method of bevelling port openings in cylinders for two-cycle engines

A device for winding a spiral spring to start an engine of a construction such that a pedal shaft and a driving sprocket which is supported on the pedal shaft are connected each other in a freely rotatable manner through a clutch which is engaged and disengaged in accordance with forward and reverse rotations of the pedal shaft, that a ratchet pawl which permits the forward rotation of the pedal shaft and prevents the reverse rotation thereof is caused to be engaged with the outer peripheral teeth of the driving sprocket, and further that the driving sprocket and a driven sprocket which is provided on a starter shaft to be connected with a spiral spring are interlinked by a power transmission chain so as to cause the spiral spring to be wound around the starter shaft at the time of the forward rotation of the driving sprocket.

Device for winding a spiral spring to start an engine

A power unit for a motor-cycle of a type having a power transmission case which supports at the rear end thereof a rear axle and which is integrally joined together at one end of a crank case of an engine, wherein the power transmission case is constituted by an inner half directly connected to the crank case and an outer half separably connected to the inner half, the rear axle being fitted onto the inner half of the power transmission case, a driving power transmission mechanism is disposed in the inner half to connect the rear axle and a crank shaft of the engine. A pedal shaft having an engine starting pedal connected at one end thereof and an engine starting shaft adjacent to the crank shaft on the same axis is fitted onto the outer half of the power transmission case. A starting power transmission mechanism is disposed in the outer half to connect the crank shaft and the engine starting shaft. A driving member and a driven member of an over-running clutch for starting which are engaged with each other at the time of coupling of the inner and outer halves of the power transmission case are provided at the opposing ends of each of the starting shaft and the crank shaft.

Power unit for a motor cycle

An improved engine starting device for a motorcycle of the kick pedal type is provided which is easy to operate, does not require any large force of operation and is thus particularly suitable for an unskilled and powerless person such as a woman or girl to operate. To this end, the device includes a spiral spring which is operatively associated with an engine crankshaft and with a pedal arm so that it can rotate the crankshaft for engine cranking by releasing its spring force or energy previously accumulated by several repetitive swing motions of the pedal arm due to the rider's foot operation. The device also provides improved safety in engine starting operation by preventing the motorcycle from starting to run unintendedly even where the engine is started with the engine throttle valve being opened excessively. For this purpose, release means, which is operable to cause the spiral spring to release its accumulated force or energy for engine cranking, is operatively connected with a manipulative member of a control system such as, for example, a brake mechanism or a clutch means, which acts to render the motorcycle inoperative, in a manner such that the former is caused to operate in response to actuation of the latter.

Growing community of inventors

Kamifukuoka, Japan

Noboru Kurata