Engine

• US 10,550,754 B2
• Filed: 05/15/2017
• Issued: 02/04/2020
• Est. Priority Date: 05/15/2017
• Status: Active Grant

• Current Assignee: Polaris Industries Incorporated (Polaris Inc.)
• Original Assignee: Polaris Industries Incorporated (Polaris Inc.)
• Inventors: Nugteren, Daniel J., Oppermann, Alexander W., Walter, C. Scott, McKoskey, G. Jay, Maher, Jeffrey M., Tittl, Steven M.
• Primary Examiner(s): Tran, Long T
• Application Number:
  US15/595,209
• Publication Number:
  US 20180328258A1
• Time in Patent Office: 995 Days
• CPC Class Codes: F01P 11/08 Arrangements of lubricant coolers in lubrication apparatus F01M
• CPC Class Codes: F01P 3/02 Arrangements for cooling cylinders or cylinder heads
• CPC Class Codes: F01P 5/10 Pumping liquid coolant; Arrangements of coolant pumps

Abstract

An engine is disclosed having a water cooling system allowing efficient cooling of the exhaust valves to prevent temperature gradients from building in the engine. Water is therefore pumped through the engine though first and second water cooling cores which discharge through the head. A water manifold is positioned over the discharge opening and includes couplings for the radiator supply, radiator return, water pump supply, oil cooler supply and oil cooler return. The engine has separate chambers to isolate the pistons and cylinders, and reed valves cover the chambers and allow the blow-by gases and oil to enter the oil pan during the power stroke of the engine cycle.

Claims

1. An engine, comprising:

a crankcase;

a head having a cooling water discharge port;

a water pump having an input port and a discharge port; and

a water manifold coupled directly to the head and comprising a seal, the seal coupled between the water manifold and the head, and the water manifold having a first coupling configured to receive cooled engine cooling water, a second coupling configured to receive used engine cooling water, and a third coupling coupled to the water pump.

2. The engine of claim 1, further comprising an oil cooler.

3. The engine of claim 2, further comprising an oil pan coupled to the crankcase.

4. The engine of claim 3, wherein the oil cooler is supported by the crankcase.

5. The engine of claim 2, wherein the water manifold further comprises a fourth coupling coupled to a cooling water intake of the oil cooler and a fifth coupling to a cooling water discharge of the oil cooler.

6. The engine of claim 5, wherein the third coupling is fluidly coupled to the fourth coupling.

7. The engine of claim 1, wherein the first coupling is fluidly coupled to the third coupling.

8. The engine of claim 1, further comprising a thermostat positioned in the first coupling.

9. The engine of claim 8, wherein the water manifold is mounted over the water discharge port.

10. The engine of claim 9, wherein the water manifold comprises an intake chamber to receive engine cooling water from the cooling water discharge port.

11. The engine of claim 10, wherein the first coupling is fluidly coupled to the intake chamber, whereby water through the thermostat and water from the engine are mixed before the pump.

12. The engine of claim 1, wherein the fourth coupling is fluidly coupled to the second coupling.

13. The engine of claim 1, further comprising a fifth coupling fluidly coupled to a water reservoir bottle.

14. The engine of claim 1, further comprising a thermistor coupled to the water manifold for measuring water temperature.

15. An engine, comprising:

a crankcase;

a crankshaft supported by the crankcase;

a cover which covers a portion of the crankcase;

an idler shaft supported between the cover and a portion of the crankcase; and

a water pump coupled directly to the crankcase and drivingly coupled to the idler shaft, the water pump having a drive shaft interengagingly coupled to the idler shaft.

16. The engine of claim 15, wherein the water pump is supported by the crankcase portion.

17. The engine of claim 16, wherein the crankcase portion is defined by a wall projecting from the crankcase defining a wall facing the cover and an opposite wall.

18. The engine of claim 17, wherein the idler shaft is supported by bearings positioned on an inside surface of the cover, and bearings positioned on the side of the wall facing the cover.

19. The engine of claim 18, wherein the water pump is coupled to the opposite wall.

20. The engine of claim 19, wherein the wall has an opening between the side of the wall facing the cover and the opposite wall, the opening being aligned with the idler shaft.

21. The engine of claim 20, wherein the water pump drive shaft having a splined surface and the idler shaft has a splined surface which cooperates with the splined surface on the water pump shaft.

22. The engine of claim 15, wherein the cover is a timing chain cover.

23. An engine, comprising:

a crankcase having at least two cylinders;

a crankshaft supported by the crankcase;

at least two pistons coupled to the crankshaft and each reciprocating within one of the cylinders;

a head positioned over the cylinders;

at least two camshafts supported by the head, each camshaft extending along a longitudinal axis;

at least four valves supported by the head and having a pair of two valves positioned over each cylinder and operatively connected to the camshafts, each pair of valves extending at a transverse axis relative to the longitudinal axis of the camshafts, and each pair of valves comprising an exhaust valve and an intake valve;

a water pump for cooling the engine head;

a first water cooling core extending through the head and extending longitudinally through the head on a first longitudinal side of the exhaust valves;

a first set of apertures extending upward through the head and communicating with the first water cooling core, the first set of apertures being positioned proximate each other and proximate a center of the head;

a second water cooling core extending through the head and extending longitudinally through the head on a second longitudinal side of the exhaust valves;

a second set of apertures extending upward through the head and communicating with the second water core; and

a water discharge port for discharging the water from the first and second water cooling cores.

24. The engine of claim 23, wherein the water pump forces cooling water through the first set of apertures into the first cooling core, and the cooling water traverses in the first water cooling core in opposite longitudinal directions.

25. The engine of claim 23, wherein the second set of apertures includes an aperture for each cylinder.

26. The engine of claim 25, wherein each second aperture is proximate to a longitudinal center of each cylinder.

27. The engine of claim 23, wherein the second set of apertures is positioned proximate each first and second cylinders.

28. The engine of claim 23, further comprising a connecting path joining the first and second water cooling cores.