Toyota Jidosha Kabushiki Kaisha

Sango Co., Ltd.

Ryoji Tachibana

Kenji Yamanari

Tomihisa Tsuchiya

Mitsumasa Yamagata

Masayuki Kuno

Keisuke Hatamura

An exhaust system member having an upstream-side opening into which exhaust gas flows and a downstream-side opening from which exhaust gas flows includes: first and second members. The first member includes first facing portions each having a distal end portion bulged radially outward in the exhaust system member, a notch is provided at a boundary between the distal end portion and a proximal end portion radially inward of the distal end portion at each end portion of each first facing portion, adjacent to the corresponding opening. The second member includes second facing portions, each arranged on the radially inner side of the corresponding distal end portion, each second facing portion is welded at a portion overlapped with the corresponding first facing portion, and a distal end face of each second facing portion facing a proximal end-side notch face of the notch in the corresponding first facing portion.

Exhaust system member

A heat shield structure includes an engine body having an exhaust manifold at its side portion, a fuel pump arranged above the engine body, and an engine cover. The engine cover includes a covering portion and a heat shield portion. The covering portion covers the fuel pump and the engine body from above. The heat shield portion protrudes downward from the covering portion. The heat shield portion partitions a space above the engine body and a space above the exhaust manifold from each other. The engine cover has an air guide passage between the engine body and the covering portion, the air guide passage extending from a front side of a vehicle toward the fuel pump.

Heat shield structure and engine cover

A piston top surface () has a depression. A center region (A) is formed at the center of the depression to secure the diameter of a center tumble flow to be large. A side region (B) is formed on both sides of the piston top surface to generate a side tumble flow that is not influenced by a cylinder bore inner wall and has a flow line generally parallel to that of the center tumble flow.

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Toyota, Japan

Ryoji Tachibana