Toyota Jidosha Kogyo Kabushiki Kaisha

Nippondenso Co., Ltd.

Noboru Matsumoto

Mikio Nakashima

Motohisa Miura

Yukio Nakamura

Humihiro Kokubo

Kinya Ueno

Kunio Kurose

Yukihiko Muramatsu

Yoshiaki Adachi

Disclosed is an air cleaner for use in an internal combustion engine. The air cleaner has an air filter element and a secondary air filter element therein. Secondary air is fed into the exhaust system of the engine from the air cleaner via the secondary air filter element and a reed valve for promoting the oxidation of unburned HC and CO components in the exhaust gas. A partition is disposed on the circumferential wall of the casing of the air cleaner and is arranged so as to extend along approximately half of the circumferential wall. A secondary air passage is formed between the partition and the circumferential wall. The secondary air filter element and the secondary air inlet are disposed in one end of the secondary air passage. The other end of the secondary air passage opens into the atmosphere. A plurality of holes are formed on the partition and are equiangularly arranged along the circumferential wall.

Air cleaner for use in an internal combustion engine

An EGR (exhaust gas recycling) system for diminishing the harmful substances of the exhaust gas from an internal combustion engine by recycling a portion thereof into the gas in-take side, comprises forming the EGR valve body and other essential parts of aluminum alloy castings and coating the portions thereof exposed to the exhaust gas with PTFE (polytetrafluoroethylene, e.g., Teflon). This phenomenally improves the corrosion-resistance and some other functions thereof.

EGR system

An exhaust gas control valve comprising a diaphragm interposed between an outer upper casing and an outer lower casing of the diaphragm housing, the diaphragm and the upper outer casing defining a first pressure chamber, an inner upper casing attached to the upper surface of the diaphragm within the first pressure chamber, an inner lower casing attached to the undersurface of the diaphragm within the outer lower casing, the inner lower casing and the diaphragm defining a second pressure chamber, a valve housing attached to the bottom of the diaphragm housing and provided with an exhaust gas intake port, an exhaust gas discharge port and a valve seat member disposed in a passage between the exhaust gas intake and discharge ports, a valve head with a stem whose upper end is attached to the center of the diaphragm so that the valve head may be moved toward and away from the valve seat member depending upon the deflection of the diaphragm, the space or chamber defined by the diaphragm and the inner upper casing and the space or chamber defined by the diaphragm and the outer lower casing being communicated with the surrounding atmosphere, and the different negative pressures being transmitted to the first and second pressure chambers, respectively, whereby the quantity of exhaust gases to be recirculated may be controlled depending upon the operating conditions of the engine to minimize the nitrogen oxide (NOx) emission.

Exhaust gas control valve

Growing community of inventors

Toyota, Japan

Noboru Matsumoto