Honda Motor Co., Ltd.

Yosuke Ariga

Masaki Cho

Masaaki Negoro

Takanori Osuka

Tomiyuki Sasaki

Junichi Ishida

A motorcycle includes an engine configured to expel an exhaust from combustion chambers of cylinders in a cylinder head through exhaust ports. Each of the cylinders is provided with a recessed portion provided in an exhaust passage wall surface in a central portion of an exhaust passage of a corresponding exhaust port. This makes it possible to maintain flow rate and flow velocity of the exhaust gas, and to decrease exhaust loss. As a result, it is possible to increase engine torque by use of a simple structure. In addition, no restriction is imposed on the layout of parts around the engine, because the recessed portions are provided in the exhaust ports.

Cylinder head for an internal combustion engine, engine incorporating the cylinder head, and method of making same

An injector mounting structure for a V-type internal combustion engine includes an intake manifold arranged in a V-bank. A fuel supply pipe extends linearly in parallel to a crankshaft and is disposed in the V-bank. A pair of injectors are branched in an inverted V-shape in side view from the direction of the axial line of the fuel supply pipe from two branch portions P, Q apart from each other in the direction of the axial line of the fuel supply pipe and extend in parallel to each other and obliquely at an acute angle &#x3b1; with respect to a segment PQ connecting the two branch portions P, Q in top view. The injectors are mounted by fitting distal end portions of the pair of injectors respectively into mounting holes formed on air-intake pipes of the intake manifold on the respective sides.

Growing community of inventors

Saitama, Japan

Yosuke Ariga