Cooling structure of multi-cylinder engine

Patent metadata

Field	Value
Publication number	US-9803534-B2
Application number	US-201514723214-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	May 30, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A cooling structure of a multi-cylinder engine is provided. The engine has cylinders and a cylinder block formed with a cylinder bore wall. The cooling structure includes a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall, a water pump for feeding a coolant to the water jacket, an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing the coolant to the water jacket, and a spacer member accommodated inside the water jacket. The spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body. The dividing wall extends in a circumferential direction at a position opposing the introduction port.

First claim

What is claimed is:

1. A cooling structure of a multi-cylinder engine having a cylinder block formed with a plurality of cylinders and a cylinder bore wall of the plurality of cylinders, the cylinder block being fastened to a cylinder head, the cooling structure comprising:
a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall;
a water pump for feeding a coolant to the water jacket by being driven by the engine;
an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing, to the water jacket, the coolant fed by the water pump; and
a spacer member accommodated inside the water jacket,
wherein the spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body,
wherein the dividing wall extends in a circumferential direction of the spacer main body to a position proximate the introduction port,
wherein the dividing wall extends out from the position proximate the introduction port so as to run facing the outer circumferential surface of the spacer main body and demarcate a cylinder head side space and a counter cylinder head side space on a side opposite from the cylinder head,
wherein the cylinder head side space is adjacent to the introduction port and provided above the dividing wall and adjacent to the outer circumferential surface of the spacer main body, and
wherein the counter cylinder head side space is adjacent to the introduction port and provided below the dividing wall.

2. The cooling structure of the multi-cylinder engine of claim 1 , wherein the dividing wall is disposed to oppose an end part of the introduction port on a cylinder head side.

3. The cooling structure of the multi-cylinder engine of claim 1 , wherein the plurality of cylinders are aligned in a predetermined cylinder aligning direction,
wherein the introduction port is formed outward of one of the cylinders disposed at an end among the plurality of cylinders in the cylinder aligning direction,
wherein the spacer member has a flow splitting wall, a first vertical wall, and a second vertical wall, each protruding toward the jacket outer surface from a part of the outer circumferential surface of the spacer main body opposing the introduction port,
wherein the flow splitting wall has a shape which extends in the circumferential direction of the spacer main body, at a position further toward the opposite side from the cylinder head than the dividing wall,
wherein the first vertical wall has a shape which extends toward the dividing wall from the flow splitting wall,
wherein the second vertical wall has a shape which extends toward the opposite side from the cylinder head, from the flow splitting wall, and
wherein the first and second vertical walls are disposed to be separated from each other in the cylinder aligning direction.

4. The cooling structure of the multi-cylinder engine of claim 1 , wherein the spacer member has a partition wall protruding toward the jacket outer surface from the outer circumferential surface of the spacer main body, extending in the circumferential direction of the spacer main body to surround substantially an entire circumference of the spacer main body, so as to form a coolant path where the coolant flows, the coolant path formed between the outer circumferential surface of the spacer main body and the jacket outer surface on the opposite side from the cylinder head.

5. The cooling structure of the multi-cylinder engine of claim 4 , wherein the partition wall is formed continuously from the dividing wall.

6. The cooling structure of the multi-cylinder engine of claim 4 , wherein the spacer main body has a step part protruding toward the jacket outer surface from the outer circumferential surface of the spacer main body, and a part of the spacer main body on a cylinder head side with respect to the step part is disposed farther from the cylinders compared to a part of the spacer main body on the opposite side from the cylinder head side with respect to the step part,
wherein the step part forms the partition wall, and
wherein on the cylinder head side of the partition wall, a coolant path where the coolant flows is formed between an inner circumferential surface of the spacer main body and an outer circumferential surface of the cylinder bore wall by the partition wall.

7. The cooling structure of the multi-cylinder engine of claim 1 , wherein the spacer main body extends from an end of the water jacket on the opposite side from the cylinder head, to an end of the water jacket on the cylinder head side, so as to partition the entire water jacket into a cylinder side space and a space on an opposite side from the cylinders, and
wherein in the spacer main body, introduction openings are formed at positions opposing interval portions formed between cylinder bores of the cylinders, each of the introduction openings communicating a part of a space of the water jacket on the cylinder side with respect to the spacer main body to an other part of the space of the water jacket on the opposite side from the cylinder with respect to the spacer main body.

8. A cooling structure of a multi-cylinder engine having a cylinder block formed with a plurality of cylinders and a cylinder bore wall of the plurality of cylinders, the cylinder block being fastened to a cylinder head, the cooling structure comprising:
a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall;
a water pump for feeding a coolant to the water jacket by being driven by the engine;
an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing, to the water jacket, the coolant fed by the water pump; and
a spacer member accommodated inside the water jacket,
wherein the spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body,
wherein the dividing wall extends in a circumferential direction of the spacer main body to a position proximate the introduction port,
wherein the dividing wall extends out from the position proximate the introduction port so as to run facing the outer circumferential surface of the spacer main body and demarcate a cylinder head side space adjacent to the introduction port and a space on a side opposite from the cylinder head and adjacent to the introduction port, and
wherein the position proximate the introduction port is in a vicinity of the introduction port.

9. The cooling structure of the multi-cylinder engine of claim 1 , wherein the dividing wall further comprises a first lateral wall and a second lateral wall,
wherein the first and second lateral walls partition the bracketed space into the cylinder head side space and the counter cylinder side space,
wherein the cylinder head side space is configured as an upper space, and
wherein the counter cylinder head side space is configured as a lower space farther away from the cylinder head than the upper space.

10. The cooling structure of the multi-cylinder engine of claim 1 , wherein the dividing wall extends out from the position proximate the introduction port so as to run in parallel to the outer circumferential surface of the spacer main body.

Assignees

• Mazda Motor

Inventors

• Marutani Yusuke
• Koguchi Tomohiro
• Misumi Haruki
• Wakamoto Shinji

Classifications

• F01P3/02 Primary

  Arrangements for cooling cylinders or cylinder heads · CPC title

• F02F1/14

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

• F01P5/12

  Pump-driving arrangements · CPC title

• F02F1/166

  Spacer decks · CPC title