Flow channel structure and cylinder block

Abstract

The flow channel structure, which is provided to a component member of an engine and through which the coolant used for cooling the engine flows, comprises: a plurality of water jackets; one bypass channel provided in parallel to the plurality of water jackets; a branch channel that branches the coolant pressure-fed by a water pump so as to flow into the most-upstream-side water jacket among the plurality of water jackets and the most-upstream-side part of the bypass channel; and a plurality of connection channels that respectively connect the plurality of water jackets to the bypass channel. The plurality of connection channels are connected to the bypass channel at mutually different positions from the upstream to the downstream of the bypass channel, and the flow channel cross-sectional areas of the plurality of connection channels increase toward the downstream side of the bypass channel.

Dependencies are inferred from the claim text.