Hot-wire type air-flow meter for internal combustion engines

摘要

The invention relates to a hot-wire type air flow meter comprising a block (230) in which an auxiliary flow path (242) is formed and a circuit unit (2) is coupled to the block (230), wherein the block (230) is inserted removably through a wall of a body (240) forming a primary flow path (241) and constituting an intake air passage of an internal combustion engine, wherein the whole auxiliary flow path (242) can be mounted to and released from the body (240) with the block (230) and wherein the auxiliary flow path (242) having an inlet portion opening to the upstream side of the primary flow path (241) and having a curved and folded auxiliary flow path (242) in order to obtain a length of the auxiliary flow path (242) being larger than the axial length of the block (230).