Engine

• US 10,428,705 B2
• Filed: 05/15/2017
• Issued: 10/01/2019
• Est. Priority Date: 05/15/2017
• Status: Active Grant

• Current Assignee: Polaris Industries Incorporated (Polaris Inc.)
• Original Assignee: Polaris Industries Incorporated (Polaris Inc.)
• Inventors: Bluhm, Michael J., Nugteren, Daniel J., McKoskey, G. Jay, Oppermann, Alexander W.
• Primary Examiner(s): Low, Lindsay M
• Assistant Examiner(s): Bailey, John D
• Application Number:
  US15/595,224
• Publication Number:
  US 20180328259A1
• Time in Patent Office: 869 Days
• Field of Search: 123 4136, 123196 CP
• CPC Class Codes: F01M 1/02 using lubricating pumps pumps in general F04; lubricating pumps per se F16N
• CPC Class Codes: F01M 13/00 Crankcase ventilating or breathing
• CPC Class Codes: F01M 2013/0044 with one or more valves
• CPC Class Codes: F01M 5/002 Cooling

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 having at least two cylinders;

a crankshaft supported by the crankcase;

at least two pistons coupled to the crankshaft and reciprocating within the cylinder;

a head positioned over a top of the crankcase being provided with separate chambers in which the crankshaft portions for each cylinder operates;

an oil pan coupled to the crankcase and positioned over the crankshaft and chambers; and

a reed valve for each of the chambers, and each reed valve allows blow-by gases to enter the oil pan during reciprocation of the pistons preventing communication between the chambers.

2. The engine of claim 1, wherein the crankcase is defined by a block and a bed plate.

3. The engine of claim 2, wherein the block and bed plate include semi-circular openings which receive the crankshaft.

4. The engine of claim 2, wherein the chambers are defined in the bed plate.

5. The engine of claim 4, wherein the bed plate is coupled to the block.

6. The engine of claim 5, wherein the head and the block are coupled to the bed plate.

7. The engine of claim 6, wherein head bolts extend through the head and the block and are received in threaded apertures in the bed plate.

8. The engine of claim 7, wherein bolts extend through the bed plate and are received in threaded apertures in the block.