A power steering apparatus in which an oil pump is selectively connected to opposite chambers of a power steering cylinder by an operation valve driven by a steering handle. The operation valve comprises a rotary disk enclosed in a valve chamber having supply and return lines in one side surface thereof, the disk having fluid conducting openings in the form of through bores to connect the supply and return lines together in a neutral steering position, and to connect them respectively to the opp...

A steering handle for a two-wheeled vehicle is attached to a support member facing the upper end of a front wheel fork attached to a steering stem. The support member is rotatably mounted on the steering stem and the fork and support member have opposed crenelations which are engageable and disengageable, so that the steering handle support member can be rotated either together with the upper end of the front wheel fork or independently thereof. The support member can be displaced either by a ca...

A vehicle steering gear apparatus comprises a pinion shaft in mesh with a rack, the pinion shaft being connectable to a steering wheel and the rack to a tie rod of a steering mechanism. The pinion shaft is supported at one end by a bearing that permits pivotal movement of the pinion shaft thereabout, and at its other end the pinion shaft is supported by a pair of bearings in a tube for axial, slidable movement. A spring acts on the tube between the pair of bearings to urge the pinion into pressu...

A fuel injection device for an internal combustion engine is subjected to the action of two spring units mounted in a suction chamber connected to the suction inlet leading to the engine such that the first spring unit becomes inoperative when the engine is under high load while the resilient action of the second spring unit varies with atmospheric pressure change. The suction chamber has front and rear diaphragm walls against which the second spring unit permanently bears, whereas the first spr...

An apparatus for forcibly closing a throttle valve in a suction passage of an internal combustion engine, the throttle valve being movable to open and close by an acceleration operation member such as an acceleration pedal or the like. The apparatus for forcibly closing the throttle valve is mounted on one side of the throttle valve, and is operated when the throttle valve is not closed and the acceleration operation member is released from operation. The apparatus for forcibly closing the throt...

An automatic temperature control device for intake air of an internal combustion engine comprises a control valve for adjusting the ratio of the amount of cool air and hot air each supplied into the interior of the intake pipe of the engine so as to control the temperature of intake air, and a negative pressure motor for operation of said control valve which negative pressure chamber is, on one hand, in conjunction with the interior of the intake pipe downstream of a throttle valve, and is, on t...

A synchromesh transmission comprises a resilient ring interposed between a sleeve mounted for axial slidable movement on a hub on a main shaft and a blocking ring provided on the outside of the sleeve. The resilient ring is arranged so that at the time of displacement of the sleeve, the resilient ring is initially pushed laterally by the sleeve so as to push the blocking ring and then the resilient ring is compressed and deflected radially by the sleeve so as to allow the sleeve to pass thereove...

A silent chain drivingly couples the sprockets on two spaced transmission shafts. The chain includes teeth for engaging the sprockets and link plates which straddle the sprockets. Guide rails are provided between the sprockets and either the rails or the link plates have portions which permit longitudinal displacement of the chain while preventing lateral movement thereof. One of the sprockets can be provided in splined engagement with its shaft to provide for automatic adjustment of its positio...

An internal combustion engine for a motorcar has, at the outer surface of at least its cylinder head portion, a forced cooling air passage which is in communication at its outlet with the interior of the passenger compartment. The spark plugs are positioned within this passage and a tubular partition wall surrounds each plug to isolate the plug in airtight manner from the interior of the passage. Each partition wall has an opening at its upper end in communication with the external air. The tubu...

A valve is interposed between a source of pressure fluid and a clutch of a transmission such that the valve initially passes the pressure fluid at a high rate to take up slack in the clutch whereafter the supply of pressure fluid to the clutch is sharply reduced during clutch engagement and subsequently gradually increased. The valve includes first and second chambers which are respectively fed with the pressure fluid being supplied to the clutch, one of the chambers being fed with delay.