Nissan Motor Company Limited

Sumitomo Electric Device Innovations, Inc.

Fuji Kiko Co., Ltd.

Naoki Ogawa

Yoshimasa Hayashi

Kazuo Ikawa

Takao Kubozuka

Hitoshi Shimonosono

Kazuyuki Fujigaya

Yoshinori Hirano

Yoshikazu Hayakawa

Yutaka Minezaki

Hiroshi Tsuda

Hirofumi Takei

Yoshimi Yamamoto

Takashi Oka

Toshiro Abe

Fumiyuki Abe

Harutoshi Tsujimura

Kiyoshi Shimada

Eiichi Abe

Hideya Yamaguchi

Akira Toda

Akira Seko

Hiroyasu Iino

Mituo Ehama

A semiconductor laser diode (LD) having an optical grating is disclosed. The LD includes a lower cladding layer that buries the optical grating, an active layer, and an upper cladding layer. The active layer has a multi-quantum well (MQW) structure of barrier layers and well layers alternately arranged. The MQW structure further includes intermediate layers between the barrier layers and the well layers. The intermediate layers have a lattice constant between that of the barrier layers and that of the well layers. Each intermediate layer has a thickness thinner than 1 nm.

Semiconductor laser diode having multi-quantum well structure

In order to improve engine warm-up characteristics under cold climatic conditions and to safegard against possible unintentional overfilling of the of the cooling circuit of an evaporative type automotive cooling system wherein the coolant is permitted to boil and the vapor used as a vehicle for removing heat from the engine, the ambient temperature or a parameter which varies with the same is sensed and the control of the cooling system modified accordingly. One main feature comes in the control which is effected to reduce the surface area of the radiator of the system in which the coolant vapor is condensed is modified to avoid overfilling and possible damage due to overpressurization.

Cooling system for automotive engine or the like including quick cold

In order to simplify the control and construction of the cooling system in a manner which avoids the need for costly electromagnetic valves and control circuits such as microprocessor and the like, a reservoir in which coolant is stored is arranged to constantly communicate with a lower portion of a cooling circuit which includes the coolant jacket and the radiator in which the coolant vapor is condensed. A small coolant pump returns condensate from the radiator to the coolant jacket in response to a temperature sensor disposed in the coolant jacket. A cooling fan or like device is operated in response to a second temperature sensor disposed at the bottom of the radiator. The reservoir communicates with the ambient atmosphere through a relief valve which remains closed until a predetermined positive or negative pressure differential prevails between the ambient atmosphere and the interior of the reservoir.

Cooling system for automotive engine or the like

An internal combustion engine comprises a cylinder block formed of aluminum alloy and having main bearing bulkheads each of which is formed with a bearing surface. Main bearing caps are securely connected respectively with the bearing bulkheads and formed of aluminum alloy. Each bearing cap is formed with a bearing surface which is located in opposition to the bearing surface of the bearing bulkhead. Additionally, the main journal of a crankshaft formed of iron alloy is rotatably disposed between the bearing surfaces of the bearing bulkhead and bearing cap. The surfaces of the crankshaft main journal is in direct contact with the bearing surfaces of the bearing bulkhead and bearing cap without using conventional bearing metals, thereby cutting off engine noise due to the existence of the bearing metals.

Internal combustion engine having aluminum alloy cylinder block

In order to obviate vapor locking and subsequent cavitation of a pump which returns coolant vapor condensate from a radiator to the coolant jacket of an evaporative type cooled internal combustion engine and maintains the highly heated structure of the engine immersed in a predetermined depth of liquid coolant, the load on the pump is sensed by determining the amount of electrical current the pump is drawing and in the event that the load is at a level indicative of pump cavitation the connection between the radiator and the pump is interrupted and communication between a reservoir and the pump is established so as to introduce cool liquid coolant into the induction port of the pump.

In the event that the normal coolant return pump of an evaporative type automotive cooling system malfunctions, a back-up system establishes fluid communication between the cooling circuit and the circulation pump of a heater circuit in a manner which enables the heater circulation pump to be used in place of the normal unit until such time as repair can be effected.

Cooling system for automotive engine or the like including coolant

In order to minimize the number of valves and conduits and the amount of coolant must be carried in an auxiliary reservoir of an evaporative type automotive cooling system, the valve and conduit arrangement which communicates the normally closed circuit cooling system with the reservoir consists of only two conduits and two valves. When the engine is stopped the cooling circuit is allowed to fill completely with the coolant from the reservoir. When the engine is started a low temperature non-condensible matter purge operation is avoided and if the temperature rises above a target value, either coolant is pumped out of the system (if excess coolant is available therein) or high temperature vapor is vented from the bottom of the radiator in bursts to purge out the non-condensible matter.

A cabin heating arrangement is associated with an evaporative type engine cooling system and arranged so that immediately after a cold engine start when the cooling circuit of the engine is completely filled with liquid coolant coolant is inducted from a first port located immediately adjacent the most highly heated structure of the engine and pumped through the core of the cabin heater. Upon the coolant temperature rising sufficiently, coolant vapor is inducted from a second port located above the first one and introduced into the heater core.

Cabin heating arrangement for vehicle having evaporative cooled engine

A cover for use in connection with an engine, comprises a layer formed of fibrous composite containing fiber material, and synthetic rubber and its cross linking agent, the fibrous composite layer being impregnated with rubber material, thereby greatly improving the noise reduction effect of the cover.

Various-covers and method for producing same

A noise reducing cover for use with an internal combustion engine, taking the form of a cylinder head cover, an oil pan, a valley cover, a valve lifter cover or the like, is constructed of a main body portion of a resilient porous material, and an inner skin layer of a resilient non-porous material, securely connected to the inside of the main body portion. The noise reducing cover excludes a hard layer made of metal or hard plastic, thereby suppressing vibration of the noise reducing cover itself even when engine vibration is transmitted thereto.

Noise reducing cover for an internal combustion engine

An automotive internal combustion engine comprises a cylinder block having a plurality of bearing sections, and a bearing beam structure secured to the bottom part of the cylinder block. The bearing beam structure includes a plurality of main bearing cap sections each of which associates with a respective cylinder block bearing section to rotatably support the journal of a crankshaft. First and second beam sections are formed at the upper corner portions of each bearing cap section to securely connect the bearing cap sections with each other. Additionally, first and second side wall sections are respectively formed along the opposite side portions of each bearing cap section to securely connect the bearing cap sections with each other. The first and second side wall sections are integral with the first and second beam sections, respectively. Therefore, vibration of the bearing beam structure and the cylinder block can be effectively suppressed, thereby achieving total engine noise reduction.

Automotive internal combustion engine with bearing beam structure

To increase the structural rigidity of outer walls of a cylinder block wherein the coolant jacket thereof is adapted to receive coolant in a liquid state and discharge same in a gaseous state, a measure is employed wherein walls of the cylinders are integrally connected at their peripheral portions and a plurality of ribs are disposed in the coolant jacket with their laterally opposed sides integrally connected with the cylinder walls and the outer walls. Each rib extends essentially along the length of the cylinders from the bottom portion of the coolant jacket thereby to form a plurality of cells in the coolant jacket.

Cylinder block of internal combustion engine

A bearing beam structure of an automotive internal combustion engine having a cylinder block formed with bearing sections, consists of a plurality of main bearing cap sections each of which associates with each cylinder block bearing section to rotatably support the journal of a crankshaft. First and second side wall sections are provided to be respectively connected with the opposite side portions of each bearing cap section to securely connect the bearing cap sections with each other. Additionally, the first and second side wall sections are respectively formed with first and second transmission installation sections to which a transmission housing is rigidly connected, thereby greatly improving the rigidity of the cylinder block entire while improving the connection-rigidity between the cylinder block and a transmission.

Bearing beam structure of automotive engine

A member adjacent to an engine, as an engine cover such as an engine head cover and oil pan and an air cleaner, is made of fiber layers by shaping organic or inorganic fibers mixed with a resin and its crosslinking agent while heating so as to cause a crosslinking reaction, thereby absorbing vibrations transmitted from an engine and remarkably decreasing noises resulting from surface vibrations of the member with the aid of the damping capacity of the fiber layers.

Member such as an engine cover adjacent to an automotive engine

A bearing beam structure is secured to a cylinder block of an internal combustion engine and includes a plurality of main bearing cap sections each of which associates with each bearing section of the cylinder block so as to rotatably support a crankshaft. At least a beam section is rigidly connected to the lower end portion of each bearing cap section to securely connect all the bearing cap sections with each other. Additionally, first and second side wall sections are rigidly connected to the opposite side portions of each bearing cap section to securely connect all the bearing cap sections with each other. Accordingly, the bearing beam structure is improved in rigidity to suppress various vibrations of the cylinder block, thereby effectively achieving total engine noise reduction.

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Yokohama, Japan

Naoki Ogawa