Diesel engine for vehicle

• US 6,135,083 A
• Filed: 06/03/1996
• Issued: 10/24/2000
• Est. Priority Date: 06/05/1995
• Status: Expired due to Fees

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Miyamoto, Masanori, Masuda, Tatsuyuki
• Primary Examiner(s): ARGENBRIGHT, TONY MICHAEL
• Application Number:
  US08/656,919
• Time in Patent Office: 1,604 Days
• Field of Search: 123/65 R, 123/73 R, 123/257, 123/196 R, 123/65 PE, 180/297
• US Class Current: 123/257
• CPC Class Codes: B60K 5/04 with the engine main axis, e.g. crankshaft axis, transversely to the longitudinal centre line of the vehicle
• CPC Class Codes: F02B 19/08 the chamber being of air-swirl type
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02D 13/0284 Variable control of exhaust valves only
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A two cycle, crankcase compression, diesel engine having a high specific output. This is achieved by using an appropriately sized and located precombustion chamber into which the fuel is injected. The porting and direction of crankshaft rotation insure against compression and combustion leakage.

Claims

1. A two-cycle diesel engine for a vehicle, said engine being comprised of a cylinder block containing at least one cylinder bore closed at one end by a cylinder head and at the other end by a crankcase member for forming a crankcase chamber, a piston reciprocating in said cylinder bore, a crankshaft journaled in said crankcase chamber, a connecting rod connecting said piston to said crankshaft for driving said crankshaft, an exhaust port formed in one side of said cylinder bore and valved by the reciprocation of said piston, and a precombustion chamber formed in said cylinder head on said one side of said cylinder bore and communicating with a main combustion chamber formed by said cylinder head, said cylinder bore and said piston through a throat directed away from said exhaust port, the direction of rotation of said crankshaft being such that said piston tends to rotate about its connection with said connecting rod in a direction during the expansion stroke for moving the upper edge of said piston into engagement with the side of said cylinder bore where said exhaust port is formed.

2. A two-cycle diesel engine as set forth in claim 1, further including scavenge port means formed in the cylinder bore on the side of the cylinder bore facing the exhaust port.

3. A two-cycle diesel engine as set forth in claim 2, wherein the engine is supported in the vehicle so that the axis of rotation of the crankshaft extends transversely to the longitudinal direction of the vehicle.

4. A two-cycle diesel engine as set forth in claim 3, wherein the engine is supported in the vehicle so that the exhaust port extends in a forward direction in the vehicle.

5. A two-cycle diesel engine as set forth in claim 3, wherein the engine is supported in the vehicle so that the scavenge port means extends generally in a rearward direction in the vehicle.

6. A two-cycle diesel engine as set forth in claim 5, wherein the engine is supported in the vehicle so that the exhaust port extends in a forward direction in the vehicle.

7. A two-cycle diesel engine as set forth in claim 3, wherein the engine is supported in the vehicle so that the cylinder bore axis is inclined to a vertically extending plane containing the axis of rotation of the crankshaft.

8. A two-cycle diesel engine as set forth in claim 7, wherein the engine is supported in the vehicle so that the exhaust port extends in a forward direction in the vehicle.

9. A two-cycle diesel engine as set forth in claim 7, wherein the engine is supported in the vehicle so that the scavenge port means extends generally in a rearward direction in the vehicle.

10. A two-cycle diesel engine as set forth in claim 9, wherein the engine is supported in the vehicle so that the exhaust port extends in a forward direction in the vehicle.

11. A two-cycle diesel engine as set forth in claim 7, wherein the engine inclination of the cylinder bore is in a rearward direction in the vehicle.

12. A two-cycle diesel engine as set forth in claim 11, wherein the engine is supported in the vehicle so that the exhaust port extends in a forward direction in the vehicle.

13. A two-cycle diesel engine as set forth in claim 11, wherein the engine is supported in the vehicle so that the scavenge port means extends generally in a rearward direction toward the vehicle.

14. A two-cycle diesel engine as set forth in claim 13, wherein the engine is supported in the vehicle so that the exhaust port extends in a forward direction in the vehicle.

15. A two-cycle diesel engine as set forth in claim 7, further including a lubricating system for delivering lubricant under pressure to certain portions of the engine for its lubrication, said lubricating system comprising an oil pump and a lubricant tank for supplying lubricant to the oil pump.

16. A two-cycle diesel engine as set forth in claim 15, wherein the lubricant pump and the oil tank is disposed on the front of the engine.

17. A two-cycle diesel engine as set forth in claim 16, wherein the lubricant pump delivers lubricant to the crankshaft for its lubrication.

18. A two-cycle diesel engine as set forth in claim 16, wherein the lubricant pump delivers lubricant directly to the piston through the cylinder bore for lubrication for the sliding surfaces of the piston and the cylinder bore.

19. A two-cycle diesel engine as set forth in claim 18, wherein the lubricant pump delivers lubricant to the crankshaft for its lubrication.

20. A two-cycle diesel engine as set forth in claim 19, further including means for sensing engine conditions and varying the amount of lubricant supplied to the engine depending upon the sensed engine running conditions.