Cooling device for multiple cylinder engine

Patent metadata

Field	Value
Publication number	US-9777615-B2
Application number	US-201414769169-A
Country	US
Kind code	B2
Filing date	Feb 12, 2014
Priority date	Feb 21, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

The present invention is configured such that: a cylinder block includes an introducing portion provided at a first side of a cylinder row, cooling liquid being introduced through the introducing portion to a water jacket, a restrictor portion provided in a vicinity of the introducing portion and configured to restrict the cooling liquid, introduced through the introducing portion, from flowing to an intake-side portion of the water jacket, and a discharging portion provided at a middle portion of the cylinder row at an intake side, the cooling liquid being discharged from the water jacket through the discharging portion; and an exhaust-side portion of the water jacket is formed such that a passage cross-sectional area of a cylinder axis direction upper side of the exhaust-side portion is larger than the passage cross-sectional area of a cylinder axis direction lower side of the exhaust-side portion.

First claim

The invention claimed is:

1. A cooling device for a multiple cylinder engine, the cooling device comprising:
a water jacket provided at a cylinder block so as to surround cylinder bores of a plurality of cylinders arranged in series;
a water jacket provided at a cylinder head; and
a cooling liquid passage in which a cooling liquid circulates by a water pump, the cooling liquid passage extending through these water jackets and a radiator, wherein:
the water jacket provided at the cylinder block includes:
an exhaust-side passage extending through an exhaust side of the cylinder block, and
an intake-side passage extending through an intake side of the cylinder block;

the cylinder block includes:
an introducing portion provided at one cylinder row direction end portion of the cylinder block, the cooling liquid being introduced through the introducing portion to the water jacket of the cylinder block,
a restrictor portion provided in the water jacket of the cylinder block and being adjacent to and located immediately downstream of the introducing portion in a flow direction, the restrictor portion being configured to restrict the cooling liquid, introduced through the introducing portion, from flowing to the intake-side passage and promote the flow of the cooling liquid to the exhaust-side passage, and
a discharging portion through which the cooling liquid is discharged from the water jacket of the cylinder block; and

the exhaust-side passage is formed such that the cooling liquid flowing into the exhaust-side passage flows through both cylinder axis direction upper and lower sides of the exhaust-side passage, and a passage cross-sectional area of the cylinder axis direction upper side of the exhaust-side passage is larger than a passage cross-sectional area of the cylinder axis direction lower side of the exhaust-side passage.

2. The cooling device according to claim 1 , wherein:
a spacer is provided inside the water jacket of the cylinder block so as to be spaced apart from an inner wall portion and an outer wall portion of the water jacket of the cylinder block;
the restrictor portion is formed at an outer periphery of the spacer; and
a portion of the spacer which corresponds to the exhaust-side passage is formed such that a space between the spacer and the outer wall portion at a cylinder axis direction upper side of the portion of the spacer is larger than a space between the spacer and the outer wall portion at a cylinder axis direction lower side of the portion of the spacer.

3. The cooling device according to claim 1 , wherein:
the cylinder head includes a discharging portion provided at a second side of the cylinder row, the cooling liquid being discharged from the water jacket of the cylinder head through the discharging portion;
the water jacket of the cylinder block and the water jacket of the cylinder head are connected to each other through a communication passage; and
the cooling liquid passage includes:
a first passage bypassing the radiator and coupling the discharging portion of the cylinder head to the introducing portion,
a second passage bypassing the radiator and coupling the discharging portion of the cylinder head to the introducing portion through a first control valve configured to control a first flow rate of the cooling liquid,
a third passage bypassing the radiator and coupling the discharging portion of the cylinder block to the introducing portion through a second control valve configured to control a second flow rate of the cooling liquid, and
a fourth passage coupling the discharging portion of the cylinder head to the introducing portion through the radiator and a third control valve configured to control a third flow rate of the cooling liquid,

the cooling device further comprising a cooling circuit control portion configured to close the first to third control valves during warm up and sequentially open the first to third control valves as a temperature of the engine increases.

4. The cooling device according to claim 3 , wherein the second passage extends through at least one of an air conditioner heater core and an EGR cooler.

5. The cooling device according to claim 3 , wherein the third passage extends through at least one of an engine oil cooler and an oil heat exchanger of an automatic transmission.

6. The cooling device according to claim 2 , wherein:
the cylinder head includes a discharging portion provided at a second side of the cylinder row, the cooling liquid being discharged from the water jacket of the cylinder head through the discharging portion;
the water jacket of the cylinder block and the water jacket of the cylinder head are connected to each other through a communication passage; and
the cooling liquid passage includes:
a first passage bypassing the radiator and coupling the discharging portion of the cylinder head to the introducing portion,
a second passage bypassing the radiator and coupling the discharging portion of the cylinder head to the introducing portion through a first control valve configured to control a first flow rate of the cooling liquid,
a third passage bypassing the radiator and coupling the discharging portion of the cylinder block to the introducing portion through a second control valve configured to control a second flow rate of the cooling liquid, and
a fourth passage coupling the discharging portion of the cylinder head to the introducing portion through the radiator and a third control valve configured to control a third flow rate of the cooling liquid,

the cooling device further comprising a cooling circuit control portion configured to close the first to third control valves during warm up and sequentially open the first to third control valves as a temperature of the engine increases.

7. The cooling device according to claim 6 , wherein the second passage extends through at least one of an air conditioner heater core and an EGR cooler.

8. The cooling device according to claim 6 , wherein the third passage extends through at least one of an engine oil cooler and an oil heat exchanger of an automatic transmission.

9. The cooling device according to claim 1 , wherein a cross-sectional area of the intake-side passage is larger than a cross-sectional area of the exhaust-side passage.

10. The cooling device according to claim 1 , wherein the introducing portion is formed on an intake-side wall surface of the cylinder block and introduces the cooling liquid in a direction toward the exhaust side of the cylinder block.

11. The cooling device according to claim 1 , wherein the discharging portion is provided at a cylinder row direction middle portion of the intake side of the cylinder block.

Assignees

• Mazda Motor

Inventors

• Matsumoto Daisuke
• Tabata Daisuke
• Naito Masahiro

Classifications

• F01P2003/028

  Cooling cylinders and cylinder heads in series · CPC title

• F02F1/10

  for liquid cooling · CPC title

• F01P2003/021

  Cooling cylinders · CPC title

• F01P2060/16

  Outlet manifold · CPC title

• F01P3/02 Primary

  Arrangements for cooling cylinders or cylinder heads · CPC title