Pressurized oil system powered by two-stroke engine

Patent metadata

Field	Value
Publication number	US-11255231-B2
Application number	US-201816103718-A
Country	US
Kind code	B2
Filing date	Aug 14, 2018
Priority date	Aug 15, 2017
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A two-stroke engine comprises a first oiling system and a second oiling system. The first oiling system includes a low-pressure pump that distributes oil from a first oil tank to the two-stroke engine. The second oiling system includes a pump mechanically coupled to a crankshaft of the two-stroke engine, wherein the pump distributes oil from a second oil tank to an accessory at a pressure greater than the first oil pressure, wherein oil distributed to the accessory is returned to the second oil tank.

First claim

The invention claimed is:

1. A two-stroke engine comprising:
a first oiling system that distributes oil from a first oil tank to the two-stroke engine at a first oil pressure;
a first accessory; and
a second oiling system that includes a pump mechanically coupled to a crankshaft of the two-stroke engine to distribute oil from a second oil tank to the first accessory at a second oil pressure greater than the first oil pressure, wherein oil distributed to the first accessory is returned to the second oil tank, wherein the second oiling system is a closed loop oiling system and is not in fluid communication with the first oiling system.

2. The two-stroke engine of claim 1 , wherein the pump is a gerotor having an inlet port in fluid communication with the second oil tank and an outlet port in fluid communication with the first accessory.

3. The two-stroke engine of claim 1 , wherein the second oiling system further includes a pressure regulator that regulates oil pressure provided to the first accessory.

4. The two-stroke engine of claim 1 , further including:
a sump configured to collect oil from the first accessory; and
a scavenge pump that distributes oil from the sump to the second oil tank, wherein the scavenge pump is mechanically coupled to the crankshaft of the two-stroke engine.

5. The two-stroke engine of claim 4 , wherein the scavenge pump and the pump are connected in a stack configuration along a single axis and coupled to the crankshaft of the two-stroke engine.

6. The two-stroke engine of claim 1 , wherein the first accessory is a turbocharger coupled to provide compressed air to the two-stroke engine.

7. The two-stroke engine of claim 1 , further including a second accessory, wherein pressurized oil is provided to the first accessory and to the second accessory in a parallel configuration.

8. The two-stroke engine of claim 1 , further including a second accessory, wherein pressurized oil is provided to the first and second accessories in a serial configuration.

9. A two-stroke engine comprising:
a first oiling system that distributes oil from a first oil tank to the two-stroke engine at a first oil pressure;
a first accessory; and
a second oiling system that includes a pump mechanically coupled to a crankshaft of the two-stroke engine to distribute oil from a second oil tank to the first accessory at a second oil pressure greater than the first oil pressure, wherein oil distributed to the first accessory is returned to the second oil tank, wherein the first oiling system is a total loss oil distribution system.

10. A snow vehicle comprising:
an endless track;
a frame;
a transmission;
a two-stroke engine mechanically coupled to drive the endless track via the transmission,
wherein the two-stroke engine comprises:
a two-stroke engine oiling system that distributes oil from a first oil tank to the two-stroke engine at a first oil pressure;
an accessory; and
a pressurized oiling system that includes a pump mechanically coupled to a crankshaft of the two-stroke engine to distribute oil from a second oil tank to the accessory at a second oil pressure, wherein oil distributed to the accessory is returned to the second oil tank, wherein the pressurized oiling system is a closed loop system and is not in fluid communication with the two-stroke oiling system.

11. The snow vehicle of claim 10 , wherein the second oil pressure is greater than the first oil pressure.

12. The snow vehicle of claim 10 , wherein the pump is a gerotor having an inlet port in fluid communication with the second oil tank and an outlet port in fluid communication with the accessory.

13. The snow vehicle of claim 10 , wherein the pressurized oiling system further includes a pressure regulator that regulates oil pressure provided to the accessory.

14. The snow vehicle of claim 10 , further including:
a sump configured to collect oil from the accessory; and
a scavenge pump that distributes oil from the sump to the second oil tank, wherein the scavenge pump and the pump are mechanically coupled to the crankshaft in a stacked configuration along a single axis.

15. The snow vehicle of claim 10 , wherein the accessory is a turbocharger coupled to provide compressed air to the two-stroke engine.

16. A snowmobile comprising:
an endless track;
a frame;
a transmission;
a two-stroke engine mechanically coupled to drive the endless track via the transmission,
wherein the two-stroke engine comprises:
an open-loop oiling system that distributes oil from a first oil tank to the two-stroke engine at a first oil pressure;
an accessory; and
a closed loop oiling system that includes a pump mechanically coupled to a crankshaft of the two-stroke engine to distribute oil from a second oil tank to the accessory at a second oil pressure, wherein oil distributed to the accessory is returned to the second oil tank.

17. The snowmobile of claim 16 , wherein the second oil pressure is greater than the first oil pressure.

18. The snowmobile of claim 16 , wherein the closed loop oiling system further includes:
a sump configured to collect oil from the accessory; and
a scavenge pump that distributes oil from the sump to the second oil tank, wherein the scavenge pump and the pump are mechanically coupled to the crankshaft in a stacked configuration along a single axis.

19. The snowmobile of claim 16 , further including:
an intercooler connected to receive compressed air from the accessory, wherein the intercooler cools a temperature of the compressed air and provides cooled, compressed air to cylinders in the two-stroke engine for combustion.

20. The snowmobile of claim 19 , further comprising a cooling circuit that includes a heat exchanger and a coolant pump to circulate coolant through the cooling circuit, wherein the cooling circuit circulates coolant from the heat exchanger to the intercooler, from the intercooler to the two-stroke engine, and from the two-stroke engine to the heat exchanger.

Assignees

• Arctic Cat Inc

Inventors

• Fuhrman Alexander Konrad
• Hayes Ryan Douglas
• Ellsworth Andrew Jon
• Christensen Cord Miller
• Sabo David Mark
• Kvenvold Derek Robert

Classifications

• F01M2011/021

  for lubricating auxiliaries, e.g. pumps or turbo chargers · CPC title

• B62M27/02

  power driven · CPC title

• F01M2001/0269

  driven by the crankshaft · CPC title

• F01P2060/04

  Lubricant cooler · CPC title

• F01M2001/123

  using two or more pumps · CPC title