Toyota Jidosha Kabushiki Kaisha

Aisan Industry Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Nippondenso Co., Ltd.

Otics Corporation

Mitsuyoshi Teramura

Masatami Takimoto

Norihiko Nakamura

Takashi Katou

Takaaki Itoh

Takaaki Itou

Katsuhiko Motosugi

Takeru Yasuda

Yukinori Isoya

Hajime Akado

Sunao Kitamura

Shinichi Kato

Toshiharu Morino

Akihide Yamaguchi

Mikio Minoura

Masahide Sakurai

Masahiro Urushidani

Manabu Shibata

Kisaburo Mizuno

Yozo Sakakibara

Haruo Yamada

Shunsuke Mizutani

Youzou Sakakibara

In a process of mounting a camshaftto a supporting member, a shaft bodyis firstly inserted into a first bearing holeF in the front side of the supporting member, before the shaft bodyis axially moved toward the second bearing holeR. In order to get a cam lobethrough a concave bearing portionM in a semicircular arc shape, rotation of the camshaftenables a cam noseto be directed downward, which is opposite from the concave bearing portionM. This enables avoiding the interference between the cam noseand the concave bearing portionM, even when the curvature radius of the concave bearing portionM is reduced. Consequently, reduction of the curvature radius of the concave bearing portionM achieves the downsizing of the supporting member

Supporting structure and a supporting member for a camshaft

In a variable venturi type carburetor having a slow speed system, a fuel vapor conduit is provided, an inlet of which is open to a main fuel passage, an outlet of which is open to an intake passage. Fuel vapor occurring in the main fuel passage is carried through the fuel vapor conduit, so as not to be introduced into a slow fuel passage; thereby, the engine is rotated stably with a relatively lean air-fuel ratio.

Variable venturi type carburetor

A variable venturi-type carburetor comprising a metering jet and at least one air-bleed bore formed on the cylindrical inner wall of the metering jet. The amount of air fed into the fuel passage of the carburetor from the air-bleed bore is controlled by an output signal from the oxygen concentration detector arranged in the exhaust manifold so that the air-fuel ratio of the mixture fed into the cylinder of the engine becomes equal to the stoichiometric air-fuel ratio. The metering needle is arranged so that it contacts the cylindrical inner wall of the metering jet and partially covers the air-bleed bore.

Variable venturi-type carburetor

An internal combustion engine having a helically-shaped intake port. When the intake manifold vacuum is in the range of about -500 through -250 mmHg, a super lean mixture is fed into the cylinders of the engine. When the intake manifold vacuum is in the range of about -250 through -100 mmHg, a fuel mixture, having the stoichiometric air-fuel ratio, is fed into the cylinders of the engine. When the intake manifold vacuum is smaller than about -100 mmHg, a rich mixture is fed into the cylinders of the engine.

Intake system of an internal combustion engine

A control device comprising a push rod and a wax valve actuating the push rod in response to the temperature of the cooling water of an engine. The push rod is connected to the throttle valve of the carburetor so that the degree of opening of the throttle valve becomes smaller as the temperature of the cooling water of the engine is increased. The amount of air fed into the fuel passage from the air bleed passage is controlled by the push rod so that the amount of the air is increased as the temperature of the cooling water of the engine is increased. A vacuum-operated, time-delay valve is connected between the air-bleed passage and the atmosphere and increases the amount of air fed into the fuel passage from the air-bleed passage following a brief time delay period after the engine starts.

Device for controlling the operation of a carburetor

A variable venturi-type carburetor comprising a main fuel passage which is open to the intake passage of the carburetor. An air bleed passage is connected to the main fuel passage. The inlet of the air bleed passage is divided into a first passage and a second passage. A first control valve and a first jet are arranged in the first passage. A second control valve and a second jet are arranged in the second passage. The second jet has a flow area which is larger than that of the first jet. The first control valve opens the first passage only when the engine is operating under an idling state. The second control valve opens the second passage only during the cruising operation of a vehicle.

Air-fuel ratio control device of a variable venturi-type carburetor

A device for adjusting the degree of opening of the throttle valve of a carburetor comprising a cam pivotally mounted on a pivot. The cam is actuated by a wax valve and rotated in accordance with an increase in the temperature of the cooling water of the engine. The cam has a cam face which is engageable with a lever connected to the throttle valve for retaining the throttle valve at a predetermined fast idling degree during engine warm-up. An auxiliary lever is pivotally mounted on the pivot. The auxiliary lever has an outer circumferential face which is engageable with the lever of the throttle valve for retaining the throttle valve at the predetermined fast idling degree after completion of engine warm-up.

Device for adjusting the degree of opening of the throttle valve of a

A variable venturi-type carburetor comprising a vacuum chamber, connected to a venturi portion of the carburetor, and a suction piston actuated in response to a change in vacuum in the vacuum chamber. A fuel passage is formed in the carburetor and is open to the intake passage of the carburetor. The suction piston has a needle extending through the fuel passage. An air bleed passage is connected to the fuel passage. When the level of vacuum in the intake passage becomes smaller than a predetermined level, the amount of air fed into the fuel passage from the air bleed passage is reduced, and the vacuum chamber is caused to be open to the atmosphere.

A thermostatic valve for compensating for the change in the intake air temperature of an internal combustion engine. The thermostatic valve has a temperature detector attached to a housing provided with a port in communication with atmosphere, a pipe in communication with a vacuum motor, a pipe in communication with the portion of the intake passage downstream from the throttle valve of carburetor and a pipe in communication with the float chamber of the carburetor and also with the air cleaner of the engine. A first valve element adapted to be operated by the temperature detector, and a second valve element adapted to be operated by the first valve element are disposed in the housing and are pressed against respective valve seats formed in the housing by means of springs. The introduction of vacuum in the intake passage into the vacuum motor for adjusting the intake air temperature is controlled in response to the change in the intake air temperature. At the same time, the shortage of intake air attributable to a rise of the intake air temperature is compensated by an additional supply of air which is made directly to the portion of the intake passage downstream from the throttle valve, upon detect of the rise of the intake air temperature.

Thermostatic valve for compensating air fuel mixture for air temperature

An exhaust gas recirculation apparatus for an internal combustion engine, which has a so-called EGR (Exhaust Gas Recirculation) valve provided with a vacuum actuator for controlling the amount of exhaust gas to be recirculated. An air introducing pipe is opened to the intake system for introducing an extra amount of air into the engine. An air control valve is provided on the air introducing pipe for stopping this introduction of the extra amount of air into the engine so that a rich air-fuel mixture can be supplied into the engine when the engine is beginning to accelerate from a low rotational speed. The vacuum actuator of the EGR valve is connected to this air introducing pipe, in order to carry out an EGR operation when a rich combustible mixture is supplied to the engine.

Growing community of inventors

Toyota, Japan

Mitsuyoshi Teramura