Toyota Jidosha Kogyo Kabushiki Kaisha

Nippon Soken, Inc.

Noboru Matsubara

Masaaki Takizawa

Yasuhiro Takeuchi

Kazuo Takahashi

Toru Kosuda

Tooru Kosuda

Michihiro Ohashi

Tadahide Toda

Hisao Mae

Masaru Tamura

Hiromi Katou

Tsutomu Hiyoshi

An apparatus for controlling the feed of the oil discharged from an oil pump in an internal combustion engine having an oil pump which feeds lubricating oil to the engine by an oil delivery pipe and which feeds working oil to a hydraulic actuator for controlling valve timings of the engine by a branch pipe connected to the oil delivery pipe, comprising valve means in said oil delivery pipe downstream of the connection between the oil delivery pipe and the branch pipe, which opens in accordance with the delivery pressure of the discharged oil to control the amount of the lubricating oil flowing therethrough.

Apparatus for controlling feed of oil discharged from oil pump

A hydraulic valve lift device for internal combustion engines includes a lifter having therein an oil pressure chamber for introduction of oil and slidably disposed in a cylindrical bore of a housing with one end thereof engaged by a cam or a cam shaft, and a plunger slidably disposed in the lifter for opening and closing an intake or exhaust valve of which a valve lift is variable depending upon the rotational speed of the cam by discharging oil from the oil pressure chamber through a throttling port. A braking chamber is defined by a flange portion of the plunger and the cylindrical bore, and is communicated through a slit with a oil feed chamber adapted to allow oil to flow thereinto. A relief valve is provided for communicating with the braking chamber to control its oil pressure below a set value. A control device is provided for controlling the relief valve depending upon an output of a detector such that the set force of the valve corresponds with a desired value.

Hydraulic valve lift device

A hydraulic valve lift device for internal combustion engines includes a lifter having therein an oil pressure chamber for introduction of oil and slidably disposed in a cylindrical bore of a housing with one end thereof engaged by a cam on a cam shaft, and a plunger slidably disposed in the lifter for opening and closing an intake or exhaust valve of which a valve lift is variable depending upon the rotational speed of the cam by discharging oil from the oil pressure chamber through a throttling port. A braking chamber is defined by a flange portion of the plunger and the cylindrical bore, and is communicated through a slit with a oil feed chamber adapted to allow oil to flow thereinto. A relief valve is provided for communicating with the braking chamber to control its oil pressure below a set value. A control device is provided for controlling the relief valve depending upon an output of a detector such that the set force of the valve corresponds with a desired value.

A variable valve event engine has a plurality of cams with different cam profiles and can vary the operating characteristics of the valve by moving a rocker arm for selectively changing the cams in accordance with changes in the operating conditions of the engine. The engine further includes a spring urging member which causes a certain amount of energy to be retained in a spring for rapidly changing the cams. The engine has a detector for sensing the temperature of the lubricant utilized in a hydraulic member for moving the rocker arm so that the movement of the rocker arm is effected only when the lubricant temperature is higher than a predetermined temperature.

Variable valve event engine

A hydraulic valve lift device for transmitting the motion of a cam to a push rod of an intake or exhaust valve of an engine, including a housing, a lifter slidably engaged by the housing and provided therein with an oil pressure chamber adapted to receive an oil, and a plunger provided with a flange portion and slidable in relation to the lifter. The flange portion of the plunger and cylindrical bore of the housing cooperate with each other to define therebetween a braking chamber into which oil is introduced. The device has a slit through which the oil in the braking chamber is relieved to the outside. The arrangement is such that the rate of oil relieved through the braking chamber is reduced as the plunger is lowered. The device further includes a relief valve for maintaining the pressure in the braking chamber below a predetermined pressure level.

A dual intake valve type internal combustion engine comprises a main intake valve and an auxiliary intake valve. The main intake valve is so constructed that the combustible gas mixture introduced into the combustion chamber therethrough is caused to generate a swirl motion. A variable valve lift type of auxiliary intake valve is constructed, and the valve lift of the auxiliary intake valve is varied in accordance with the changes in the engine operating conditions.

Dual intake valve type internal combustion engine

A hydraulic tappet is used in a variable valve lift engine. The tappet comprises an outer case having a pressure chamber formed therein, an inner case having an oil chamber formed therein and engaged within the outer case, and a check valve disposed between the pressure chamber and the oil chamber. The pressure chamber is communicated with an electromagnetic valve via an additional check valve. The electromagnetic valve is actuated in accordance with changes in operating conditions of an engine, i.e. the engine load and the temperature of the engine, so that the oil pressure between the additional check valve and the electromagnetic valve is maintained at a predetermined level. As a result, the valve lift of the engine can be varied at an optimum level in accordance with changes in the operating conditions of the engine.

Variable valve lift mechanism used in an internal combustion engine

A variable valve event engine has a plurality of cams with different cam profiles and can vary the operating characteristics of the valve by moving a rocker arm for selectively changing the cams in accordance with changes in the operating conditions of the engine. The engine further includes a spring urging member which causes a certain amount of energy to be retained in a spring for rapidly changing the cams. In addition, the engine has a stopper guide positioned between two adjacent cams so that the changing of the cams can be effected while the crankshaft angle of the engine is within a predetermined range.

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Susono, Japan

Noboru Matsubara