Multicylinder engine cooling apparatus

Patent metadata

Field	Value
Publication number	US-10337392-B2
Application number	US-201715798685-A
Country	US
Kind code	B2
Filing date	Oct 31, 2017
Priority date	Nov 30, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A multicylinder engine cooling apparatus includes: an exhaust side cooing passage individually formed to extend in an exhaust side of the cylinder head in which the plurality of exhaust pipes are disposed; an intake side cooling passage individually formed to extend in an intake side of the cylinder head in which the plurality of intake pipes are disposed; a first downstream cooling water passage through which the cooling water having passed through the exhaust side cooling passage flows; a second downstream cooling water passage that allows the cooling water having passed through the exhaust side cooling passage and then the intake side cooling passage to flow to the first downstream cooling water passage at some midpoint of the first downstream cooling water passage; and a switching valve that switches a flow passage of the cooling water discharged from the exhaust side cooling passage between the intake side cooling passage and the first downstream cooling water passage.

First claim

The invention claimed is:

1. A multicylinder engine cooling apparatus configured to cool an engine by flowing cooling water through the engine, the engine comprising a cylinder head to which a plurality of pairs of intake pipes and exhaust pipes are coupled based on a layout of a plurality of cylinders, the multicylinder engine cooling apparatus comprising:
an exhaust side cooling passage individually formed to extend in an exhaust side of the cylinder head in which the plurality of exhaust pipes are disposed;
an intake side cooling passage individually formed to extend in an intake side of the cylinder head in which the plurality of intake pipes are disposed;
a first downstream cooling water passage through which the cooling water having passed through the exhaust side cooling passage flows without passing through the intake side cooling passage;
a second downstream cooling water passage that allows the cooling water having passed through the exhaust side cooling passage and then the intake side cooling passage to flow to the first downstream cooling water passage at a point between ends of the first downstream cooling water passage; and
a switching valve configured to switch a flow passage of the cooling water discharged from the exhaust side cooling passage between the intake side cooling passage and the first downstream cooling water passage.

2. The multicylinder engine cooling apparatus according to claim 1 , further comprising a heat collector provided in the first downstream cooling water passage,
wherein the second downstream cooling water passage is coupled to the first downstream cooling water passage in a downstream of the heat collector so as to bypass the heat collector.

3. The multicylinder engine cooling apparatus according to claim 2 , further comprising a controller configured to control circulation of the cooling water,
wherein just after the engine is activated, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the intake side cooling passage.

4. The multicylinder engine cooling apparatus according to claim 2 , wherein when a heat exchange is required in a cold state just after the engine is activated, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the first downstream cooling water passage to supply the cooling water to the heat collector.

5. The multicylinder engine cooling apparatus according to claim 3 , wherein when a heat exchange is required in a cold state just after the engine is activated, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the first downstream cooling water passage to supply the cooling water to the heat collector.

6. The multicylinder engine cooling apparatus according to claim 2 , wherein when the engine is subjected to a high load, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the first downstream cooling water passage.

7. The multicylinder engine cooling apparatus according to claim 3 , wherein when the engine is subjected to a high load, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the first downstream cooling water passage.

8. The multicylinder engine cooling apparatus according to claim 4 , wherein when the engine is subjected to a high load, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the first downstream cooling water passage.

9. The multicylinder engine cooling apparatus according to claim 5 , wherein when the engine is subjected to a high load, the controller switches the switching valve such that the cooling water discharged from the exhaust side cooling passage flows to the first downstream cooling water passage.

10. The multicylinder engine cooling apparatus according to claim 1 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

11. The multicylinder engine cooling apparatus according to claim 2 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

12. The multicylinder engine cooling apparatus according to claim 3 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

13. The multicylinder engine cooling apparatus according to claim 4 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

14. The multicylinder engine cooling apparatus according to claim 5 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

15. The multicylinder engine cooling apparatus according to claim 6 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

16. The multicylinder engine cooling apparatus according to claim 7 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

17. The multicylinder engine cooling apparatus according to claim 8 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

18. The multicylinder engine cooling apparatus according to claim 9 , wherein the exhaust side cooling passage, the intake side cooling passage, and the first downstream cooling water passage are coupled to the switching valve.

Assignees

• Subaru Corp

Inventors

• Akiba Shingo
• Shimizu Yoshiyuki
• Nishina Hirotake
• Mikami Hiroaki

Classifications

• F01P2025/31

  Cylinder temperature · CPC title

• F01P3/14

  for cooling intake or exhaust valves · CPC title

• F01P2003/028

  Cooling cylinders and cylinder heads in series · CPC title

• F01P7/14

  the coolant being liquid · CPC title

• F01P2003/024

  Cooling cylinder heads · CPC title