COOLING DEVICE FOR MULTI-CYLINDER ENGINE

摘要

A cylinder block (3) includes an inlet portion (36), a narrow portion (42), and an inclined portion (43). A cylinder head includes a head-side discharge portion. The inlet portion is formed on the first cylinder side of a cylinder array, and introduces coolant to a block-side water jacket (33). The narrow portion is formed in the vicinity of the inlet portion, and restricts the coolant introduced through the inlet portion from flowing to an intake-side channel (35) of the block-side water jacket. The inclined portion is formed in the vicinity of the inlet portion, and guides the coolant introduced through the inlet portion toward the head. The head-side discharge portion is formed on the fourth cylinder side of the cylinder array, and discharges the coolant from a head-side water jacket. A communication path for communicating between the water jackets is formed on the head side of the inclined portion.

主权项

1. A cooling device for a multi-cylinder engine, comprising:
a cylinder block including a block-side water jacket configured to surround a plurality of cylinder bores for an array of cylinders disposed in series; a cylinder head including a head-side water jacket; and a coolant channel for circulating coolant by a water pump via the block-side water jacket, the head-side water jacket, and a radiator, wherein the cylinder block includes:
an inlet portion formed on one end side of the cylinder array, and configured to introduce coolant to the block-side water jacket;a narrow portion formed in a vicinity of the inlet portion, and configured to restrict the coolant introduced through the inlet portion from flowing to an intake-side channel of the block-side water jacket; andan inclined portion formed in the vicinity of the inlet portion, and configured to guide the coolant introduced through the inlet portion toward the cylinder head, the cylinder head includes:
a head-side discharge portion formed on the other end side of the cylinder array, and configured to discharge the coolant from the head-side water jacket; anda communication path formed on a cylinder head side of the inclined portion, and configured to communicate between the block-side water jacket and the head-side water jacket, both of the inclined portion and the communication path are formed on the one end side of the cylinder array, and the inclined portion is configured to guide the coolant toward the cylinder head so that the coolant is allowed to flow into the head-side water jacket via the communication path.