Cooling structure of multi-cylinder engine

Patent metadata

Field	Value
Publication number	US-10174708-B2
Application number	US-201715484693-A
Country	US
Kind code	B2
Filing date	Apr 11, 2017
Priority date	Apr 19, 2016
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A cooling structure of a multi-cylinder engine is provided, which includes a water jacket formed in a cylinder block to surround cylinder bores of cylinders arranged inline, a spacer, and a coolant inlet. The spacer includes openings at positions corresponding to inter-cylinder-bore portions and a rectifying part extending outwardly on a lower side of the openings. The rectifying part inclines continuously upwardly while extending in one of an exhaust- and intake-side section of the jacket from a first end side to a second end side that is the opposite side from the first end side in a cylinder line-up direction, extending on the second end side from the one of the exhaust- and intake-side sections to the other one of the exhaust- and intake-side sections, and then extending from the second end side to the first end side in the other one of the exhaust- and intake-side sections.

First claim

What is claimed is:

1. A cooling structure of a multi-cylinder engine, comprising:
a water jacket formed in a cylinder block to surround cylinder bores of a plurality of cylinders arranged inline,
a spacer having a vertical wall surface and inserted into the water jacket, and
a coolant inlet formed in a part of an outer wall of the water jacket on a first end side in a cylinder line-up direction, and for circulating to the water jacket a coolant introduced from the coolant inlet, wherein
the vertical wall surface surrounds the cylinder bores,
the spacer includes:
a plurality of openings formed in an upper part of the vertical wall surface, at positions corresponding to inter-cylinder-bore portions of the cylinder block, respectively; and
a rectifier extending outwardly from the vertical wall surface on a lower side of the openings to approach the outer wall of the water jacket, dividing the vertical wall surface and rectifying a flow of the coolant introduced from the coolant inlet along an upper section of the vertical wall surface above a lower section of the vertical wall surface on a same side of the spacer as seen from the cylinder line-up direction, and

the rectifier inclines, when the spacer is disposed in the water jacket, continuously upwardly while extending in one of an exhaust-side section and an intake-side section of the water jacket from the first end side to a second end side opposite from the first end side in the cylinder line-up direction, further extending on the second end side from the one of the exhaust- and intake-side sections to the other one of the exhaust- and intake-side sections, and then extending from the second end side to the first end side in the other one of the exhaust- and intake-side sections.

2. The cooling structure of claim 1 , wherein:
concaved sections are formed at intake and exhaust sides of an upper end part of the inter-cylinder-bore portions, to dent inwardly in directions perpendicular to the cylinder line-up direction and to vertical directions of the cylinder block, and
the openings are formed in an upper end part of the vertical wall surface corresponding to the concaved sections.

3. The cooling structure of claim 1 , wherein the spacer further includes a first flange and a second flange at least in an exhaust side part of the vertical wall surface, the first flange extending outwardly from an upper end part of the vertical wall surface and also extending over the openings in the cylinder line-up direction, the second flange extending outwardly from the vertical wall surface on a lower side of the first flange, extending in the cylinder line-up direction, being provided at vertically the same position as the openings, and being cut out in parts corresponding to the openings.

4. The cooling structure of claim 1 , wherein the spacer further includes protruding portions on the lower side of the openings to protrude inwardly from the vertical wall surface so as to approach an inner wall of the water jacket, each of the protruding portions being provided in the upper part of the vertical wall surface to have a given length in vertical directions.

5. The cooling structure of claim 1 , wherein the rectifier inclines continuously upwardly at a fixed inclination.

6. The cooling structure of claim 1 , wherein:
the spacer further includes a third flange extending outwardly from the vertical wall surface adjacently to the rectifier to approach the outer wall of the water jacket, at the first end side of a lower end part of the vertical wall surface, and
the rectifier is formed continuously with the third flange.

7. A cooling structure of a multi-cylinder engine, comprising:
a water jacket formed in a cylinder block to surround cylinder bores of a plurality of cylinders arranged inline,
a spacer having a vertical wall surface and inserted into the water jacket, and
a coolant inlet formed in a part of an outer wall of the water jacket on a first end side in a cylinder line-up direction, and for circulating to the water jacket a coolant introduced from the coolant inlet, wherein
the vertical wall surface surrounds the cylinder bores,
the spacer includes:
a plurality of openings formed in an upper part of the vertical wall surface, at positions corresponding to inter-cylinder-bore portions of the cylinder block, respectively; and
a rectifier extending outwardly from the vertical wall surface on a lower side of the openings to approach the outer wall of the water jacket, dividing the vertical wall surface and rectifying a flow of the coolant introduced from the coolant inlet along an upper section of the vertical wall surface above a lower section of the vertical wall surface on a same side of the spacer as seen from the cylinder line-up direction,

the rectifier inclines, when the spacer is disposed in the water jacket, continuously upwardly while extending in one of an exhaust-side section and an intake-side section of the water jacket from the first end side to a second end side opposite from the first end side in the cylinder line-up direction, further extending on the second end side from the one of the exhaust- and intake-side sections to the other one of the exhaust- and intake-side sections, and then extending from the second end side to the first end side in the other one of the exhaust- and intake-side sections,
the exhaust-side section of the rectifier is inclined from a lower side of the spacer to an upper side of the spacer along a length of the spacer as viewed from the cylinder line-up direction, and
the intake-side section of the rectifier is provided with an inclined part that is inclined from the lower side of the spacer to the upper side of the spacer in a first region of the spacer when viewed from the cylinder line-up direction, and provided with a flow dividing rib configured to divide the flow of the coolant vertically in a second region of the spacer when viewed from the cylinder line-up direction.

8. A cooling structure of a multi-cylinder engine, comprising:
a water jacket formed in a cylinder block to surround cylinder bores of a plurality of cylinders arranged inline,
a spacer having a vertical wall surface and inserted into the water jacket, and
a coolant inlet formed in a part of an outer wall of the water jacket on a first end side in a cylinder line-up direction, and for circulating to the water jacket a coolant introduced from the coolant inlet, wherein
the vertical wall surface surrounds the cylinder bores,
the spacer includes:
a plurality of openings formed in an upper part of the vertical wall surface, at positions corresponding to inter-cylinder-bore portions of the cylinder block, respectively; and
a rectifier extending outwardly from the vertical wall surface on a lower side of the openings to approach the outer wall of the water jacket, and for rectifying a flow of the coolant introduced from the coolant inlet,

the rectifier inclines, when the spacer is disposed in the water jacket, continuously upwardly while extending in one of an exhaust-side section and an intake-side section of the water jacket from the first end side to a second end side opposite from the first end side in the cylinder line-up direction, further extending on the second end side from the one of the exhaust- and intake-side sections to the other one of the exhaust- and intake-side sections, and then extending from the second end side to the first end side in the other one of the exhaust- and intake-side sections, and
a guide part connected to the rectifier extends into a concaved section formed proximate to the coolant inlet.

9. The cooling structure of claim 8 , wherein:
the concaved section is recessed more downward than the coolant inlet; and
the concav

Assignees

• Mazda Motor

Inventors

• Mori Uichiro
• Hayamizu Yoshiaki
• Tabata Daisuke
• Matsumoto Daisuke

Classifications

• F01P3/02

  Arrangements for cooling cylinders or cylinder heads · CPC title

• F01P2003/021

  Cooling cylinders · CPC title

• F02F1/14 Primary

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

• F01P5/10

  Pumping liquid coolant; Arrangements of coolant pumps · CPC title