Nissan Motor Company Limited

Hitachi, Ltd.

Kyugo Hamai

Yasuhiko Nakagawa

Meroji Nakai

Takayuki Arai

Takaharu Goto

Yutaka Matayoshi

Shigeru Kamegaya

Junichi Furukawa

Ryusaburo Inoue

Ryuzaburo Maruyama

Hideki Sekiguchi

Yoshikazu Tanaka

Masayuki Tamura

Ryuzaburo Inoue

Shogo Miyamoto

Ryuzaburou Inoue

Takashi Ishizuka

Hisafumi Usuki

Yoshimi Uchida

Tsuyoshi Nakano

Toru Yoshimura

The invention provides a power transmission apparatus for vehicle which can realize a high torque transmission efficiency and a high reduction gear ratio of a reduction gear unit with a more compact structure, and a vehicle-driving electric machinery system using the power transmission apparatus for vehicle. The power transmission apparatus for vehicle comprises a motor, a reduction gear unit for decelerating power outputted from the motor, and a differential gear unit for distributing the power decelerated by the reduction gear unit to left and right wheels. The reduction gear unit is a reduction gear mechanism including a plurality of gears mounted over a shaft which is rotatably held by a housing in a fixed position. The reduction gear unit and the differential gear unit are arranged within an area in oppositely facing relation to an axial end surface of the motor.

Power transmission apparatus for vehicle and vehicle-driving electric machinery system using the same

This invention relates to the shape of a skirt below the piston head of a piston in an engine cylinder and continuous with it. The skirt has a basic configuration comprising at least two type of elliptical horizontal cross-section with a short axis parallel to said piston pin, and a barrel-shaped vertical cross-section smaller at its top and bottom. A T-shaped projection is also provided on the lateral surfaces of the skirt corresponding to the two ends of the long axis of said ellipse, this projection consisting of a vertical piece and two side pieces situated on either side of the vertical piece. When the engine is running, the skirt comes into contact with the inner surface of the cylinder via this projection. The vertical section of the lower part of the skirt from below the lower edge of the two side pieces to the lower edge of the skirt is inclined toward the inside of said barrel-shaped vertical section so that the skirt is joined smoothly to the projection below the two side pieces. Accumulation of pressure on the edge of the projection is thereby prevented, which reduces frictional resistance and prevents wear between the piston and the cylinder.

Engine piston

A piston for an internal combustion engine comprises a skirt portion formed with a piston pin hole. The skirt portion includes in an axial direction of the piston a first portion upper than an axis of the piston pin hole, and a second portion lower than the axis thereof. The first portion has a first cross section formed in accordance with a first ellipse, and the second portion has a second cross section formed in accordance with a second ellipse. The first and second ellipses have two foci, respectively, on a center plane of the piston which is perpendicular to the axis of the piston pin hole. The first ellipse is smaller in ellipticity than the second ellipse. The skirt portion including a ramp portion connecting the first portion to the second portion.

Piston for internal combustion engine

A piston assembly of an internal combustion engine is provided with a piston structure with which oil comsumption is suppressed. A piston of the assembly is disposed inside each cylinder wall of the engine and formed with a top land and the second land. A compression ring groove is formed between the top and second lands. A first chamfered surface is formed at the upper peripheral edge of the second land, and a second chamfered surface larger in width than the first chamfered surface is formed at the lower peripheral edge of the top land. A compression ring having a butt-type ring gap is disposed in the compression ring groove to be slidably contacted with the cylinder wall. With this structure, the oil comsumption is effectively suppressed in both high pressure and negative pressure conditions during operation of the combustion chamber corresponding to the cylinder.

Piston assembly of internal combustion engine

The first of a pair scissor like rocker arms is pivotally mounted at one end either by way of an adjust screw or a hydraulic lash adjuster and arangement to engage the top of a valve stem at the other. A cam follower which is located between the first and second ends engages a lift cam. The second of the rocker arms is pivotally mounted on the first one and has a closure cam follower at one end and engages the lower face of a retainer which secured to the top of the valve stem by way of a ring type collet. The shaft on which the second rocker arm is pivotally mounted can be provided with eccentric portions which enable the second rocker arm valve clearances to be adjusted separately from the adjustment of the first rocker arm clearance. The arrangement can be adapted to lift and close two valves.

Rocker arm arrangement for internal combustion engine poppet valves and

A first rocker arm is used to induce valve lift while a second one used to move the valve back to closed position. The rocker arms are arranged to engage the valve top or retainer surfaces at locations offset from the axis of the valve and to induce the valve to rotate during the lift and closing operations. Springs, hydraulic lifters or double adjust screw type arrangements are used to control clearances.

Operating arrangement for internal combustion engine poppet valves and

In a single point injection system of the kind having an electronically controlled fuel injector disposed upstream of a throttle valve, a throttle body is formed with a fuel storage chamber and an idle fuel pickup passage for supplying fuel in the fuel storage chamber into an auxiliary air passage in such a manner that a quantity of fuel supplied through the idle fuel pickup passage is proportional to the flow rate of air passing through the auxiliary air passage.

Fuel supply system for internal combustion engine

An ignition system for a multi-cylinder internal combustion engine eliminates high-voltage cables and a mechanical distributor in order to reduce electrical power losses due to joule effect caused mainly by the high voltage circuit, comprises a plurality of ignition coils and plugs, one provided for each cylinder, a distribution unit for distributing advance-angle control signals into the respective cylinders, and a booster for boosting the supply voltage in order to reduce the size of the ignition coil, in addition to the conventional ignition system. Furthermore, the ignition coil can be built integrally with the ignition plug for eliminating high-voltage cables connected between coil and plug.

Ignition system for an internal combustion engine

An ignition system for an internal combustion engine having a plurality of engine cylinders, wherein ignition coil and spark plug are integrally assembled into each engine cylinder so as to eliminate an ignition energy transmission loss, a DC-DC converter for boosting a low DC voltage into a high DC voltage is provided for applying the high DC voltage into each secondary winding of the ignition coils for achieving an efficient ignition of air-fuel mixture, the application of the high DC voltage being enabled according to a particular engine operating condition, e.g., engine low speed and light engine load condition, and the ignition energy being varied according to an engine operating condition by changing the pulsewidth of the ignition pulse signal to be fed into a cylinder judging circuit which judges the spark plug to be ignited and distributes the ignition pulse signal into the related circuit of the corresponding ignition coil.

A system for forcefully igniting a spray of fuel injected into combustion chambers of a diesel engine during engine starting, in place of a conventional glow plug preheating system. The system comprises a plurality of spark plugs located within the respective combustion chambers of the diesel engine and an ignition means for sequentially igniting each of the spark plugs. The system is operated simultaneously with an engine starter motor and at least until the engine has achieved a spontaneous ignition state or most preferably until a fixed interval of time after the engine has achieved the spontaneous ignition state. Detection of the spontaneous ignition state is based on (a) combustion pressure; (b) engine speed; (c) oxygen concentration; (d) engine starter motor actuation (e) exhaust gas temperature; or (f) engine cooling water temperature.

System for forcefully igniting sprayed fuel of a diesel engine during

An internal combustion engine ignition system comprises: (a) a capacitive discharge ignition device having a voltage transformer which converts a low DC voltage into a corresponding AC voltage and boosts and rectifies the AC voltage into a first higher DC voltage for discharging each of the spark plugs sequentially, boosts and rectifies the AC voltage into a second higher DC voltage for generating arc-sustaining ignition energy, and rectifies the AC voltage into a third higher DC voltage; (b) an ignition signal generating means which generates and outputs an ignition signal whenever the engine rotates through a predetermined engine rotational angle offset by an angular interval determined by the engine speed and engine load; (c) an ignition coil means having a primary winding and secondary winding, one end of the primary winding thereof receiving the first DC voltage from the DC-DC converting means, the other end of the primary winding thereof being grounded when the ignition signal is received from the ignition signal generating means, one end of the secondary winding receiving the second DC voltage from the DC-DC converting means; and (d) a plurality of spark plugs, each located within a corresponding engine cylinder and having a gap between electrodes and one end thereof being connected to the DC-DC converting means for receiving the second and third DC voltages when the ignition signal is received by the ignition coil.

Sustained arc ignition system for an internal combustion engine

In order to improve the cold starting efficiency of a an internal combustion engines using alcohol or low cetane type fuel, an ignition method provides an ignition mode in which a plurality of energizations of the ignition plugs per cycle is effected during engine cold starting operation which is detected by sensing at least one of the engine temperature and the engine speed. The number of energizations per cycle is returned to one after the engine has sufficiently warmed up. The method is applied to both of a plasma ignition system and a conventional spark ignition system.

Internal combustion engine ignition method

A spark plug for an internal combustion engine disclosed herein includes a resistive semiconductor body connecting a center electrode and an earth electrode to perform a creeping discharge at low discharge voltages while keeping adequate ignition performances. According to the invention, the spark plug comprises a back electrode at the back of a discharging gap to cause the creeping discharge on surfaces of an electric insulator which is resistant to electrolytic corrosion, thereby improving the durability of the plug and eliminating the trouble of electric waves of noises.

Spark plug for internal combustion engine

A plasma ignition system for a multi-cylinder internal combustion engine each cylinder having a plasma ignition plug, including diesel engine. According to the present invention, in addition to the elements of the conventional plasma ignition system there is provided an oscillation device which generates and outputs a high-frequency oscillating voltage into each of the plasma ignition plugs to be ignited before the plasma ignition timing so that a multiple sparking occurs and therefore the resistance of the plasma ignition plug to be ignited is reduced to facilitate plasma ignition with relatively low plasma ignition energy without misfire even during a high engine load.

Plasma ignition system for internal combustion engine

The invention relates to a swirl-chamber Diesel engine. A swirl-chamber Diesel engine is disclosed which has a main combustion chamber, a swirl chamber, and a communicating passage for connecting them. The problem encountered is that, when the engine runs at low speeds, fuel droplets within the swirl chamber will gather and flow along the communicating passage into the main combustion chamber. To prevent this unfavorable fuel flow, a depression is formed within the swirl chamber to collect the fuel droplets. The depression is disposed adjacent to and communicating with the communicating passage via a rounded lip to provide an arrangement which will make it easy for the combustion gases flow to draw the collected fuel from the depression. Since the fuel is drawn from the depression by the combustion gases flow, carbonization of fuel on the depression wall will not take place.

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Yokosuka, Japan

Kyugo Hamai