Aisan Kogyo Kabushiki Kaisha

Kaisho So

Mamoru Yoshioka

Takashi Bessho

Shinji Kawai

Akinari Yasue

Hironori Suzuki

Naruto Ito

Eiji Nakamura

Koichi Sugihara

Mizuki Kodama

Hirotaka Fukuta

Koki Yasuda

An EGR valve includes: an inner housing including a flow passage; a valve element which opens and closes the flow passage; a valve shaft on which the valve element is provided; an outer housing in which the inner housing is assembled; and a drive unit which drives the valve shaft. The flow passage of the inner housing includes an inlet and an outlet. The outer housing includes an assembly hole and separate flow passages. When the inner housing is assembled in the assembly hole, the inlet and the outlet of the inner housing communicate with the separate flow passages of the outer housing; an inlet sealing member is provided between the inner housing and the outer housing to correspond to the periphery of the inlet; and an outlet sealing member is provided between the inner housing and the outer housing to correspond to the periphery of the outlet.

Valve device

An EGR gas distributor for distributing EGR gas to branch pipes of an intake manifold includes a plurality of gas distribution passages arranged side by side for the branch pipes, a gas inflow passage and a gas chamber to deliver the EGR gas to each of the gas distribution passages. The gas inflow passage includes two, first and second, gas passage parts branched in a single stage. When the EGR gas distributor is mounted on the intake manifold, a passage cross-section of each gas passage part perpendicular to a central axis has an uppermost vertex and a lowermost vertex. The passage cross-sections of the gas passage parts are sized such that their lengths in a vertical direction are gradually longer from an upstream side of the first gas passage part to a downstream side of the second gas passage part.

EGR gas distributor

An EGR system is configured to allow a part of exhaust gas discharged from an engine to an intake passage to flow as EGR gas to an intake passage through an EGR passage to return to the engine. In the EGR system, a heating film is provided on an inner wall or an outer wall of at least one of the intake passage through which the EGR gas is allowed to flow and the EGR passage. At least a pair of a positive electrode and a negative electrode is provided to energize the heating film.

EGR system

An EGR gas distributor includes a gas chamber, a gas inflow passage to introduce EGR gas on its upstream side, gas outflow passages to discharge the EGR gas to branch pipes on their downstream side. An inner wall on a downstream side of the gas chamber is divided into downstream-side divided walls corresponding to the respective gas outflow passages, and the downstream-side divided walls are curved or slanted to be of protrusion-like shape protruding toward the corresponding gas outflow passages. Downstream-side dividing ridges are provided each between the adjacent downstream-side divided walls. An inner wall on the upstream side of the gas chamber is placed to face the downstream-side inner wall and provided with at least one upstream-side ridge protruding toward the downstream-side divided walls in each area corresponding to the downstream-side divided walls.

An EGR system is configured to allow a part of exhaust gas discharged from an engine to an exhaust passage to flow as an EGR gas to an intake passage through an EGR passage to return to the engine. The EGR system includes a heating film provided on an inner wall of at least one of the intake passage through which the EGR gas flows, i.e., an intake manifold, and the EGR passage, at least one pair of a positive electrode and a negative electrode to energize the heating film, a water temperature sensor and an intake temperature for detecting a warm-up state of the intake passage and the EGR passage, and an electronic control unit configured to control energization of the heating film from before start of EGR based on the detected warm-up state.

An EGR gas distributor for distributing EGR gas to each of branch pipes of an intake manifold includes a gas chamber, a gas inflow passage, and a plurality of gas distribution passages. The inner wall of the gas chamber on a downstream side is divided into a plurality of downstream divided walls corresponding to the gas distribution passages. On the boundary between adjacent two of the downstream divided walls, a downstream ridge is provided in a perpendicular direction to the arrangement direction of the gas distribution passages. The downstream ridges are arranged side by side in number corresponding to the number of gas distribution passages. The downstream ridges each include a side surface in the arrangement direction. The downstream ridges are different in at least one of height and inclination angle of the side surface according to the positions of the downstream ridges.

An intake apparatus includes an intake manifold, an EGR gas distributor, and an EGR cooler. The intake manifold includes a surge tank and branch pipes. The EGR gas distributor includes a gas inlet, a gas chamber, and gas distribution pipes connected to the branch pipes. The branch pipes are each formed with a connecting hole for the gas distribution pipes. The EGR cooler is provided adjacent to the gas chamber to warm the inside wall of the gas chamber and includes a hot water passage and a gas passage. The gas chamber and the hot water passage are arranged to traverse the branch pipes. The gas distribution pipes are connected to the corresponding connecting holes. The EGR gas distributor and the EGR cooler in an integrated form are attached to the intake manifold.

Growing community of inventors

Nagoya, Japan

Kaisho So