US 9,435,247 B2 · Exhaust pipe structure of motorcycle

Abstract

An exhaust pipe structure of a motorcycle allowing exhaust air of an exhaust pipe having a branching part to flow into the respective exhaust pipes on the downstream side of the branching part uniformly and smoothly. In an exhaust pipe structure of a motorcycle having an engine attached to a vehicle body frame, an exhaust pipe is connected to an exhaust port of the engine and is provided with a branching pipe that branches into a left-rear-portion exhaust pipe and a right-rear-portion exhaust pipe. A muffler is connected to the left-rear-portion exhaust pipe. A muffler is connected to the right-rear-portion exhaust pipe. The branching pipe is located on a lateral side of a cylinder unit of the engine and above a crankcase cover.

Claims16

Dependent claims

An exhaust pipe structure for a motorcycle having an internal combustion engine which comprises:

an exhaust pipe having an elongated circular shape and connected to an exhaust port of the internal combustion engine, said exhaust pipe including a branching part that branches into two branch exhaust pipes;
and
a muffler connected to each of the branch exhaust pipes;
said branching part being located on a lateral side of a cylinder unit of the internal combustion engine and above a crankcase cover and branching rearwardly into said branch exhaust pipes which have circular shaped upstream end portions, the circular shape of the upstream end portions of the exhaust pipes being partially deformed to form flat walls which are in contact with each other, whereby vehicle body space is effectively enhanced.

1 more element

An exhaust pipe structure for a motorcycle having an internal combustion engine attached to a vehicle body frame, comprising:

an exhaust pipe connected to an exhaust port of the internal combustion engine and provided with a branching part located on a lateral side of a cylinder unit of the internal combustion engine and above a crankcase cover, that branches rearwardly into left rear portion and right rear portion exhaust pipes provided with respective mufflers,
the exhaust pipe extending from the exhaust port toward a front side of the motorcycle and then curving rearwardly to form said branching part which branches rearwardly into said left rear portion exhaust pipe and said right rear portion exhaust pipe, upstream end portions of the left rear portion and right rear portion exhaust pipes being partially deformed to form flat walls which are in contact with each other, and
the branching part comprising an elongated circular shape with a long axis of the elongated circular shape being inclined to be parallel to a tangent plane to a curving outer circumferential line passing on an outermost circumference of the curving part of the exhaust pipe.

Dependencies are inferred from the claim text.

Exhaust pipe structure of motorcycle

Life of this patent

Exhaust pipe structure of motorcycle

Life of this patent

Abstract

Claims16