Patent ID: 9587551
Date: 2017-03-07
CPC Classifications: F01P

Claim:
1. A coolant passage structure for an internal combustion engine, the coolant passage structure enabling coolant to be supplied to a coolant passage in the internal combustion engine, the coolant passage structure comprising: a coolant communication member accommodating a centrifugal water pump and being attached to the internal combustion engine, wherein the coolant communication member includes a housing portion, a scroll portion, a first coolant passage portion, and a second coolant passage portion, the housing portion accommodates an impeller of the centrifugal water pump, the scroll portion links to the housing portion and includes a downstream region connected to the first coolant passage portion, the first coolant passage portion is positioned above the downstream region of the scroll portion, the first coolant passage portion includes a downstream region connected to an upstream region of the second coolant passage portion, the second coolant passage portion is cylindrical, the second coolant passage portion includes a downstream region connected to the coolant passage in the internal combustion engine, a direction of a center line of the first coolant passage portion is parallel to a direction of a rotation shaft of the centrifugal water pump, a direction of a center line of the second coolant passage portion is orthogonal to the direction of the center line of the first coolant passage portion, a rib is disposed on an internal circumferential surface of the first coolant passage portion, the rib extends substantially in parallel to the center line of the first coolant passage portion, the internal circumferential surface of the first coolant passage portion includes two opposite surfaces, one of the two opposite surfaces that is remote from the housing portion is defined as an outer surface, the other surface of the two opposite surfaces opposed to the outer surface is defined as an inner surface, and the rib is disposed on the inner surface.