Abstract: An exhausting apparatus for a four-cycle four-cylinder engine having four cylinders each provided with an exhaust port comprises four exhaust pipes connected to corresponding exhaust ports of the engine cylinders. The four exhaust pipes are classified into first and second groups in accordance with ignition timings and the first and second groups of two exhaust pipes each are shifted in connection with the ignition timings by means of an angle of 360.degree. with respect to each other. Exhaust chamber members including two exhaust chambers each, are in communication with front portions of the exhaust pipes respectively through means of communication holes and two communication pipes, one connecting the first group of the exhaust pipes and the other connecting the second group of the exhaust pipes.

Abstract: There is disclosed an air cleaner of an engine for a vehicle. The air cleaner shaped by fitting upper and lower cases together includes an air intake unit inclined downwards so that a cylindrical part, provided at the top end of the air intake unit, for joining an air valve is disposed in a relatively lower position than the air intake unit. During a process of airtightly fitting the upper and lower cases, this arrangement restrains an engine overall height to a low value and prevents fluctuations in sectional area of the air intake unit which are due to reconstruction of the air intake unit to eliminate the difficulty caused particularly in a portion for joining the air valve to the air intake unit.

Abstract: A jet propulsion craft propelled upon a water surface generally comprises a hull structure comprising a bottom plate and an upper plate, an engine mounted upon the bottom plate at substantially a middle portion of the hull structure as considered in the longitudinal direction thereof, the engine being provided with an exhaust port, an exhaust system extending rearwardly from the engine and provided with an inlet end and an outlet end, the inlet end being operatively connected to the engine exhaust gas discharging port, and a jet pump mounted upon the bottom plate at a rear portion of the hull structure and driven by means of the engine. An exhaust gas noise eliminating device operatively connected to the outlet end of the exhaust system is further provided for the craft for eliminating the exhaust gas noise in a stepwise manner.

Abstract: A dynamic valve mechanism in an internal combustion engine for opening and closing a valve by swinging a rocker arm in accordance with rotation of a cam shaft. The valve mechanism includes a rocker shaft for swingably supporting the rocker arm, a positioning portion fixedly mounted on the rocker arm and projecting in the axial direction of the rocker shaft, and a thrust bearing portion mounted on the cylinder head for supporting the rocker shaft through a holding portion thereof and projecting toward the rocker arm side in order to position the rocker arm by contact with the positioning portion.

Abstract: An examination device for use with a vehicle constant speed control apparatus which adjusts the speed of a vehicle to a predetermined speed in response to a constant speed control command includes a first switching arrangement for connecting and disconnecting an electric power supply and the apparatus, and a second switching arrangement for delivering the constant speed control command. A control arrangement is provided for inhibiting the constant speed control of the vehicle when the second switching arrangement is on at the time the first switching arrangement is connected.

Abstract: An idle speed control apparatus for controlling the idle speed of an internal combustion engine includes a main inlet air passage, a throttle valve positioned in the main air passage, a bypass air passage connected to the main air passage and bypassing the throttle valve, a control valve positioned in the bypass air passage, and an auxiliary bypass air passage which bypasses both the throttle valve and the control valve. The control valve is responsive to a control signal to control air flow in the bypass air passage and regulate the idle speed of the engine. A manually operable mechanism is provided in the auxiliary air passage for manually controlling air flow therethrough and adjusting the engine idle speed. A first control signal causes the control valve to maintain the idle speed within a normally desired range. To facilitate manual adjustment of the idle speed, an arrangement is provided which permits manual generation of a selection signal indicating that manual adjustment of the idle speed is desired.

Abstract: A suspending apparatus for vehicles includes a suspension arm having a wheel-side supporting portion and two vehicle body side supporting portions to support a wheel so that the wheel can reciprocate vertically relative to the vehicle body. A first centerline connecting the two vehicle body side supporting portions extends obliquely relative to a second centerline defined by a wheel shaft which supports the wheel. The vehicle body side supporting portions are positioned such that the first centerline passes through a corner portion of a vehicle component, such as a fuel tank. A side surface of the suspension arm between the two vehicle body side supporting portions extends along the corner portion of the vehicle component, while being spaced therefrom. The suspension arm includes a base plate and a subplate, the base plate having a substantially C-shaped cross section.

Abstract: A fuel injection system for a multiple cylinder two-stroke cycle engine having a plurality of cylinders provided with intake manifolds, respectively, comprises a plurality of fuel injectors each operatively connected to its respective intake manifold, a controlling unit operatively connected to the fuel injectors for controlling fuel injection of the fuel injectors, and a unit operatively connected to the fuel injection controlling unit for detecting the revolution number or speed of the engine. The fuel injection controlling unit includes a micro computer for carrying out calculations in response to information from the engine revolution operation detecting unit so as to inject the fuel a plurality of times with equal angular intervals defined therebetween during one revolution of the engine, or the crank shaft, during the neutral and low revolution periods of the engine.

Abstract: A trochoidal pump having an inner rotor and an outer rotor incorporated eccentrically to each other within a housing bore of a pump housing. The inner and outer rotors have internal and external teeth defined by a trochoid and held in intermeshing engagement. The center of the outer rotor is set to ensure that the distance defined between the tip ends of the internal and external teeth will be greater than zero when the tip end of the internal tooth of the inner rotor and the tip end of the external tooth of the outer rotor are positioned directly opposite each other by the rotation of the outer rotor in assocation with the inner rotor.

Abstract: On an outer peripheral portion of a rotor (1), three protrusions are provided per each cylinder. A pickup coil 2 is disposed facing to the outer peripheral portion with a predetermined distance. A rotation signal (S.sub.0) is converted to a rotation signal pulse (S.sub.1) having three pulses (A, B and C) per each cylinder corresponding to the three protrusions. According to the first signal (A) of the rotation signal pulse (S.sub.1) the cranking ignition period (A.sub.1) is determined. According to the second signal (B) of the rotation signal pulse (S.sub.1), the starting timing for flowing current to the ignition coil (8) is decided. According to the third signal (C) of the rotation signal pulse (S.sub.1), the ignition timing at cranking operation is defined by detecting time intervals (3t, t, 2t) between the three signals (A, B, C).

Abstract: An apparatus for use in an outboard engine provides a voice alarm output when an abnormality of cooling water or the like is detected during operation of a radio or the like, the abnormal state being announced with a synthesized voice. The apparatus has a plurality of sensors for detecting the abnormality of the cooling water and the like, and a voice output circuit to receive detection signals from the sensors and to output a synthesized voice signal identifying the abnormal state. An acoustic reproducing apparatus such as a radio is provided, and a common speaker is used to output the radio output or the voice output signal of the voice output circuit. A voice discriminating switching circuit is provided between the voice output circuit and the acoustic reproducing apparatus. The voice discriminating circuit detects the level of an output signal of the voice output circuit and temporarily switches the speaker from the acoustic reproducing apparatus to the voice output circuit in response to the level.

Abstract: A cylinder head for a four-cycle engine having combustion chamber holes formed in the lower surface thereof, and mounting at least one rotatable cam shaft along the upper surface. The cylinder head may also mount a rocker shaft to permit use with either a 1-cam 2-valve engine or a 1-cam 4-valve engine.

Abstract: A diagnosis arrangement for a vehicle engine controller includes a control arrangement which examines a signal identifying the activation of an auxiliary control system of the engine and which determines whether the auxiliary engine control system, which includes a device controlled by a particular control program selected from a plurality of programs stored therein, is actuated in a manner corresponding to the selected control program.

Abstract: A hydraulic control method is applied to a continuously variable speed change gear mechanism including a pulley having a fixed pulley member fixed to a rotary shaft and a movable pulley member movable by oil pressure toward and away from the fixed pulley member so that a groove width between the fixed and movable pulley members is decreased or increased to thereby reduce or increase the effective rotational radius of a belt extending between the pulley members and thus change a change gear ratio and control the gear change.

Abstract: A hydraulic control method is applied to a continuously variable speed change gear mechanism including a pulley having a fixed pulley member fixed to a rotary shaft and a movable pulley member movable by oil pressure toward and away from the fixed pulley member so that a groove width between the fixed and movable pulley members is decreased or increased to thereby reduce or increase the effective rotational radius of a belt extending between the pulley members and thus change a change gear ratio and control the gear change.

Abstract: There is disclosed a fuel supply system having a fuel delivery pipe for distributing fuels to injectors of cylinders. This system further includes an inner pipe fixedly inserted into the delivery pipe to constitute part of a fuel passageway, the inner pipe having a length approximate to the delivery pipe. Fuel feed and feedback pipes close to each other are connected to a proximal portion of the fuel passageway consisting of the delivery pipe and the inner pipe.

Abstract: A radiator device for a motorcycle operatively connected to an engine unit provided with a water jacket and in which cooling liquid circulates comprises a pair of first and second radiator units arranged bilaterally in upright fashion with respect to the motorcycle body. Each of the radiator units is composed of upper and lower tanks in an upright arrangement thereof, the upper tank of the first radiator unit having a top portion disposed at a level lower than a top portion of the upper tank of the second radiator unit. The cooling water directly introduced into the upper tank of the first radiator unit is then divided and one branch flow of the cooling water is fed into the upper tank of the second radiator unit through means of another water tube interconnecting the upper tanks of the first and second radiator units.

Abstract: A four-wheel steering device for an automobile includes a main turning arrangement for steering main wheels, a subsidiary turning arrangement for sterring subsidiary wheels, and a control system including a motor having terminals thereon, first and second steering angle sensor arrangements for detecting first and second steering angles of the main the subsidiary wheels, respectively, and a control arrangement. The control arrangement is responsive to a state change of the first and second detected steering angles for determining the operating state of the control system. The control arrangement is operable when the control system operates normally to drive and control the motor and thereby the subsidiary turning means so as to steer the subsidiary wheels depending on the steering angle of the main wheels.

Abstract: A method for manufacturing a disk for a belt-driven continuously-variable-speed drive of the type which includes a metal belt disposed in engagement between mutually facing sheave surfaces which form a V-groove, including the steps of machining each sheave surface with a numerical control lathe to form therein a spiral groove that is centered about the center of the pulley and has a surface roughness within the range of 0.8-0.4 microns, and thereafter super finishing the sheave surfaces to produce residual stress therein.

Abstract: A piston member for an internal combustion engine of, for example, a motor bicycle is provided with bosses having inner end surfaces opposing to each other into which a piston pin is inserted. A connecting rod has small and large end portions and the small end portion is slidably coupled with the end surfaces when the connecting rod is inserted into the body of the piston member through a cutout portion formed at one end thereof to form a skirt portion. The sizes, dimensions, and structures of the end surfaces of the bosses, the cutout portion, and the associated elements are determined to be suitable for coating thin films of metallic particles on the end surfaces by flame coating means.