ENGINE EQUIPPED WITH SUPERCHARGER

• US 20200132122A1
• Filed: 10/22/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Kubota Corporation
• Original Assignee: Kubota Corporation
• Inventors: OSO, Hiroki, OKADA, Nobuyoshi, MATSUNOBU, Shingo, TANAKA, Yoshinori, SAKURAI, Ayako
• Granted Patent: US 11,261,780 B2
• Time in Patent Office: Days
• CPC Class Codes: F01M 2011/021 for lubricating auxiliaries, e.g. pumps or turbo chargers
• CPC Class Codes: F01M 5/002 Cooling
• CPC Class Codes: F01P 11/08 Arrangements of lubricant coolers in lubrication apparatus F01M
• CPC Class Codes: F01P 2003/008 the liquid being water and oil
• CPC Class Codes: F01P 2060/04 Lubricant cooler
• CPC Class Codes: F01P 3/02 Arrangements for cooling cylinders or cylinder heads
• CPC Class Codes: F01P 3/12 Arrangements for cooling other engine or machine parts
• CPC Class Codes: F02B 2039/164 the temperature of the pump, of the pump drive or the pumped fluid being limited
• CPC Class Codes: F02B 39/005 Cooling of pump drives
• CPC Class Codes: F02B 39/14 Lubrication of pumps; Safety measures therefor
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02M 35/10157 Supercharged engines

Abstract

There is provided an engine equipped with a supercharger that suppresses heat deterioration of engine oil. The engine equipped with a supercharger includes a supercharger; an oil supply passage that supplies engine oil to a shaft bearing part of the supercharger; an oil discharge passage that discharges the engine oil from the shaft bearing part of the supercharger; and a water-cooling-type oil cooler. The water-cooling-type oil cooler is provided in the oil discharge passage, and the engine oil discharged from the shaft bearing part of the supercharger is cooled by the engine cooling water that passes the water-cooling-type oil cooler. The engine cooling water is desirably supplied from the cylinder jacket to the water-cooling-type oil cooler.

Claims

1. An engine equipped with a supercharger, comprising:

a supercharger;

an oil supply passage that supplies engine oil to a shaft bearing part of the supercharger;

an oil discharge passage that discharges the engine oil from the shaft bearing part of the supercharger; and

a water-cooling-type oil cooler,

wherein the water-cooling-type oil cooler is provided in the oil discharge passage, and the engine oil discharged from the shaft bearing part of the supercharger is cooled by engine cooling water that passes the water-cooling-type oil cooler.

2. The engine equipped with a supercharger according to claim 1, further comprising an engine water-cooling device,

wherein the engine water-cooling device includes a radiator, a cylinder jacket, and a cylinder head jacket, and the engine cooling water circulates in an order of the radiator, the cylinder jacket, and the cylinder head jacket, and

the engine cooling water is supplied to the water-cooling-type oil cooler from the cylinder jacket.

3. The engine equipped with a supercharger according to claim 1, wherein

the water-cooling-type oil cooler is constituted by an outer cylinder and an inner cylinder, the engine oil passes through the inner cylinder, the engine cooling water passes through a cooler jacket between the inner cylinder and the outer cylinder, and heat of the engine oil in the inner cylinder is released to the engine cooling water in the cooler jacket through a peripheral wall of the inner cylinder.

4. The engine equipped with a supercharger according to claim 2, wherein

the water-cooling-type oil cooler is constituted by an outer cylinder and an inner cylinder, the engine oil passes through the inner cylinder, the engine cooling water passes through a cooler jacket between the inner cylinder and the outer cylinder, and heat of the engine oil in the inner cylinder is released to the engine cooling water in the cooler jacket through a peripheral wall of the inner cylinder.

5. The engine equipped with a supercharger according to claim 1, wherein

the water-cooling-type oil cooler is constituted by an outer cylinder and an inner cylinder, the engine cooling water passes through the inner cylinder, the engine oil passes through a cooler jacket between the inner cylinder and the outer cylinder, and heat of the engine oil in the cooler jacket is released to the engine cooling water in the inner cylinder through a peripheral wall of the inner cylinder.

6. The engine equipped with a supercharger according to claim 2, wherein

the water-cooling-type oil cooler is constituted by an outer cylinder and an inner cylinder, the engine cooling water passes through the inner cylinder, the engine oil passes through a cooler jacket between the inner cylinder and the outer cylinder, and heat of the engine oil in the cooler jacket is released to the engine cooling water in the inner cylinder through a peripheral wall of the inner cylinder.

7. The engine equipped with a supercharger according to claim 3, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on an upstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on a downstream side in the oil passing direction.

8. The engine equipped with a supercharger according to claim 4, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on an upstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on a downstream side in the oil passing direction.

9. The engine equipped with a supercharger according to claim 5, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on an upstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on a downstream side in the oil passing direction.

10. The engine equipped with a supercharger according to claim 6, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on an upstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on a downstream side in the oil passing direction.

11. The engine equipped with a supercharger according to claim 3, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on a downstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on an upstream side in the oil passing direction.

12. The engine equipped with a supercharger according to claim 4, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on a downstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on an upstream side in the oil passing direction.

13. The engine equipped with a supercharger according to claim 5, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on a downstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on an upstream side in the oil passing direction.

14. The engine equipped with a supercharger according to claim 6, wherein

the engine cooling water that passes through the water-cooling-type oil cooler is supplied to the water-cooling-type oil cooler on a downstream side in an oil passing direction that is a direction in which the engine oil passes through the water-cooling-type oil cooler and is discharged from the water-cooling-type oil cooler on an upstream side in the oil passing direction.

15. The engine equipped with a supercharger according to claim 3, wherein

the outer cylinder of the water-cooling-type oil cooler is made of a metal, and an outer circumferential surface of the outer cylinder is exposed to engine cooling air in an air path for the engine cooling air generated by the engine cooling fan.

16. The engine equipped with a supercharger according to claim 4, wherein

the outer cylinder of the water-cooling-type oil cooler is made of a metal, and an outer circumferential surface of the outer cylinder is exposed to engine cooling air in an air path for the engine cooling air generated by the engine cooling fan.

17. The engine equipped with a supercharger according to claim 15, wherein

the water-cooling-type oil cooler includes a cooling-water introducing pipe for introducing the engine cooling water, the cooling-water introducing pipe is made of a metal, and an outer circumferential surface of the cooling-water introducing pipe is exposed to the engine cooling air in the air path.

18. The engine equipped with a supercharger according to claim 15, wherein

the water-cooling-type oil cooler includes a cooling-water lead-out pipe for leading out the engine cooling water, the cooling-water lead-out pipe is made of a metal, and an outer circumferential surface of the cooling-water lead-out pipe is exposed to the engine cooling air in the air path.

19. The engine equipped with a supercharger according to claim 15, wherein

the oil supply passage is constituted by an oil supply pipe made of a metal, and an outer circumferential surface of the oil supply passage is exposed to the engine cooling air in the air path.

20. The engine equipped with a supercharger according to claim 3, wherein

a circumferential wall of the inner cylinder of the water-cooling-type oil cooler is constituted by folds that are bent inward and outward when viewed in a direction parallel with a central axis line of the inner cylinder.