Lubricating system for engine

• US 5,537,959 A
• Filed: 08/09/1994
• Issued: 07/23/1996
• Est. Priority Date: 08/09/1993
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Ito, Takeshi
• Primary Examiner(s): MCMAHON, MARGUERITE J
• Application Number:
  US08/287,908
• Time in Patent Office: 714 Days
• Field of Search: 123/73 AD, 123/196 R
• US Class Current: 123/73.0AD
• CPC Class Codes: F01M 1/16 Controlling lubricant pressure or quantity rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22
• CPC Class Codes: F01M 3/02 with variable proportion of lubricant to fuel, lubricant to air, or lubricant to fuel-air-mixture
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F16N 2230/02 Microprocessor; Microcomputer
• CPC Class Codes: F16N 2270/30 intermittent

Abstract

A motor vehicle containing a two-cycle, crankcase compression, internal combustion engine having direct lubricating systems for supplying lubricant to the sliding surfaces of the piston and cylinder bore for each cylinder of the engine, separate pumps for delivering lubricant to the crankshaft bearings associated with each cylinder of the engine and a system for delivering lubricant to the engine for the remaining components through the induction system. Various arrangements are disclosed for delivering the lubricant to the induction system including systems having a separate pump for each cylinder and combined arrangements.

Claims

1. A lubricating system for a two-cycle crankcase compression internal combustion engine comprised of a cylinder, at least one cylinder bore formed by said cylinder, a piston supported for reciprocation within said cylinder bore, a crankshaft rotatably journalled in a crankshaft chamber formed at one end of said cylinder bore and driven by said piston, a cylinder head affixed to said cylinder at the other end of said cylinder bore forming with said piston and said cylinder bore a combustion chamber the volume of which varies upon reciprocation of said piston, an induction system for supplying a charge to said crankcase chamber, a reed type check valve in said induction system for permitting air to flow into said crankcase chamber from said induction system means and precluding reverse flow from said crankcase chamber into said induction system means, a first lubricating system for delivering lubricant directly to said cylinder bore for lubricating the sliding surfaces of said piston and said cylinder bore, a second lubricating system for delivering lubricant to said induction system upstream of said reed type check valve, and means for controlling the amount of lubricant supplied by said first and said second lubricating systems independently of each other in response to engine running conditions.

2. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 1, wherein the cylinder forms a plurality of cylinder bores each slidably supporting a piston connected to the crankshaft and wherein the first lubricating system has means for supplying lubricant to each of the cylinder bores and the second lubricating system has means for independently supplying lubricant to the induction systems of each of the cylinder bores.

3. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 2, wherein the first and second lubricating systems each have means for independently controlling the amount of lubricant delivered by the respective system to the respective cylinder.

4. A lubricating system for a two-cycle crankcase compression internal combustion engine comprised of a cylinder, at least one cylinder bore formed by said cylinder, a piston supported for reciprocation within said cylinder bore, a crankshaft rotatably journalled in a crankshaft chamber formed at one end of said cylinder bore and driven by said piston, a cylinder head affixed to said cylinder at the other end of said cylinder bore forming with said piston and said cylinder bore a combustion chamber the volume of which varies upon reciprocation of said piston, an induction system for supplying a charge to said crankcase chamber, a reed type check valve in said induction system for permitting air to flow into said crankcase chamber from said induction system means and precluding reverse flow from said crankcase chamber into said induction system means, a first lubricating system for delivering lubricant directly to said cylinder bore for lubricating the sliding surfaces of said piston and said cylinder bore, and a second lubricating system for delivering lubricant to said induction system upstream of said reed type check valve, said first and second lubricating systems each including respective first and second lubricating pumps.

5. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 4, wherein the delivery of lubricant by the first and second lubricating pumps are controlled independently of each other.

6. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 5, wherein the operation of the first and second lubricating pumps are each controlled by a separate control each mapped to indicate lubricating requirements for the sliding surfaces and remaining components in response to engine conditions.

7. A lubricating system for a two-cycle crankcase compression internal combustion engine comprised of a cylinder, a plurality of cylinder bores formed by said cylinder, a plurality of pistons each supported for reciprocation within a respective one of said cylinder bores, a crankshaft rotatably journalled in a plurality of crankshaft chambers each formed at one end of a respective one of said cylinder bores and driven by said pistons, a cylinder head affixed to said cylinder at the other end of said cylinder bores forming with said pistons and said cylinder bores a plurality of combustion chambers the volume of which varies upon reciprocation of said pistons, an induction system for supplying a charge to said crankcase chamber, reed type check valves in said induction system for permitting air to flow into each of said crankcase chambers from said induction system means and precluding reverse flow from said crankcase chambers into said induction system means, a first lubricating system for delivering lubricant directly to said cylinder bores for lubricating the sliding surfaces of said piston and said cylinder bore, and a second lubricating system for delivering lubricant to said induction system upstream of said reed type check valves, each lubricating system including a plurality of lubricating pumps, one for each cylinder bore.

8. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 7, wherein the control for each of the lubricating pumps controls the respective lubricating pump independently of the remaining lubricating pumps.

9. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 8, further including means for draining lubricant from the crankcase chamber and delivering it back to the engine through the induction system.

10. A lubricating system for a two-cycle crankcase compression internal combustion engine comprised of a cylinder, at least one cylinder bore formed by said cylinder, a piston supported for reciprocation within said cylinder bore, a crankshaft rotatably journalled in a crankshaft chamber formed at one end of said cylinder bore and driven by said piston, a cylinder head affixed to said cylinder at the other end of said cylinder bore forming with said piston and said cylinder bore a combustion chamber the volume of which varies upon reciprocation of said piston, an induction system for supplying a charge to said crankcase chamber, a reed type check valve in said induction system for permitting air to flow into said crankcase chamber from said induction system means and precluding reverse flow from said crankcase chamber into said induction system means, a first lubricating system for delivering lubricant directly to said cylinder bore for lubricating the sliding surfaces of said piston and said cylinder bore, a second lubricating system for delivering lubricant to said induction system upstream of said reed type check valve, and a third lubricating system for delivering lubricant to said crankshaft.

11. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 10, wherein the cylinder forms a plurality of cylinder bores each slidably supporting a piston connected to the crankshaft and wherein the first lubricating system has means for supplying lubricant to each of the cylinder bores and the second lubricating system has means for independently supplying lubricant to the induction systems of each of the cylinder bores.

12. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 11, wherein the first, second and third lubricating systems each have means for independently controlling the amount of lubricant delivered by the respective system to the respective cylinder.

13. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 12, wherein each lubricating system includes a plurality of lubricating pumps, one for each cylinder.

14. A lubricating system for a two-cycle crankcase compression internal combustion engine as in claim 13, further including means for draining lubricant from the crankcase chamber and delivering it back to the engine through the induction system.