Cooling device for multi-cylinder engine

Patent metadata

Field	Value
Publication number	US-2016010533-A1
Application number	US-201414760943-A
Country	US
Kind code	A1
Filing date	Feb 7, 2014
Priority date	Feb 21, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

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.

First claim

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; and
an 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; and
a 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.

2 . The cooling device for a multi-cylinder engine according to claim 1 , further comprising:
a spacer disposed in the block-side water jacket, with a gap being formed between the spacer and an inner wall portion of the block-side water jacket, and between the spacer and an outer wall portion of the block-side water jacket, wherein the narrow portion and the inclined portion are formed on an outer periphery of the spacer.

3 . The cooling device for a multi-cylinder engine according to claim 2 , wherein
an exhaust-side channel of the block-side water jacket is formed in such a manner that a sectional area of an upper portion of the exhaust-side channel in a cylinder axis direction is larger than a sectional area of a lower portion of the exhaust-side channel.

4 . The cooling device for a multi-cylinder engine according to claim 3 , wherein
a step portion is formed on an exhaust side portion of the spacer at a middle of the spacer in the cylinder axis direction, the step portion continuing to an upper end of the inclined portion, and the step portion is formed in such a manner that the gap between the spacer and the outer wall portion is large in an upper portion of the channel with respect to the step portion, as compared with a lower portion of the channel.

5 . The cooling device for a multi-cylinder engine according to claim 3 , wherein
the narrow portion includes a rib-like upper narrow portion and a rib-like lower narrow portion, each of which projects outward from the outer periphery of the spacer, and the upper narrow portion is formed to have a larger projection amount than the lower narrow portion.

6 . The cooling device for a multi-cylinder engine according to claim 5 , wherein
the spacer includes a brim portion at a lower end of an intake side portion of the spacer, the brim portion projecting outward from the outer periphery of the spacer.

7 . The cooling device for a multi-cylinder engine according to claim 3 , wherein
the cylinder block includes a block-side discharge portion formed in an intake side portion of the cylinder block at a middle of the cylinder array, and configured to discharge the coolant from the block-side water jacket.

8 . The cooling device for a multi-cylinder engine according to claim 7 , further comprising:
a control valve disposed on the coolant channel communicating with the block-side discharge portion, the control valve being operative to open and close depending on an engine temperature, wherein when the engine is in a cold state, the control valve closes the coolant channel, so that the coolant from the inlet portion is guided toward the cylinder head by the inclined portion, and the coolant is allowed to flow into the head-side water jacket from the communication path.

9 . The cooling device for a multi-cylinder engine according to claim 1 , wherein
the inclined portion is formed on the one end side of the cylinder array, the inclined portion being a climbing inclination directing from an intake side toward an exhaust side.

Assignees

• Mazda Motor

Inventors

• Matsumoto Daisuke
• Tabata Daisuke
• Naito Masahiro

Classifications

• F01P5/10

  Pumping liquid coolant; Arrangements of coolant pumps · CPC title

• F01P2003/028

  Cooling cylinders and cylinder heads in series · CPC title

• F01P2060/16

  Outlet manifold · CPC title

• F02F1/14

  Cylinders with means for directing, guiding or distributing liquid stream · CPC title

• F01P3/02 Primary

  Arrangements for cooling cylinders or cylinder heads · CPC title