Outboard motor

Abstract

An outboard motor S has an upstream intake silencer with an upstream expansion chamber, and a downstream intake silencer disposed under the upstream intake silencer. The upstream expansion chamber has a lower wall of a stepped shape including a raised part overlapping the downstream intake silencer in a plane and a lowered part without overlapping with the downstream intake silencer in a plane and at a level lower than that of the raised part. An upstream outlet passage of the upstream intake silencer is formed in the raised part. The downstream intake silencer has a stepped upper wall having a raised part, and a lowered part underlying the lower wall of the upstream expansion chamber in a plane and extending at a level lower than that of the raised part. A downstream inlet passage of the downstream intake silencer is formed in the lowered part of the upper wall. The respective stepped shapes complementary to each other of the lower wall of the upstream intake silencer and the upper wall of the downstream intake silencer are utilized for enhancing the intake noise reducing effect of the intake silencers and for forming the outboard motor in reduced vertical size by compactly stacking up the intake silencers.

Dependencies are inferred from the claim text.