Internal-combustion engines – Lubricators – Crankcase – pressure control
Reexamination Certificate
2000-10-09
2001-08-14
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Lubricators
Crankcase, pressure control
Reexamination Certificate
active
06273051
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a crankshaft bearing and bushing assembly for a piston engine.
U.S Pat. No. 5,896,656 shows a lubricating arrangement for pistons or piston heads of a piston engine or an internal combustion engine. The lubricant is supplied through lubrication channels which supply the bearings or the bearing bushings of the crankshaft with lubricant. Lubricant supply channels which supply lubricant to the piston heads are formed in the cylinder block near the crankshaft bearings. It is known to mount spray nozzles into such lubricant supply channels in order to direct the lubricant to the piston heads for lubrication and cooling. Such nozzles are shown in Component Technical Manual, John Deere Usine de Saran, CTM3274 (Jul. 1, 1999). The aforementioned Component Technical Manual also shows such crankshaft bearings which provide positioning devices in the form of projections or depressions that can interact with corresponding depressions or projections on the cylinder block. Such designs require a costly configuration of the piston engine and the bearing bushings.
SUMMARY OF THE INVENTION
Accordingly, an object of this invention is to provide a low cost configuration for a piston engine and bearing bushings.
These and other objects are achieved by the present invention, wherein a piston engine includes a crankshaft bearing member and a bearing bushing which receive and rotatably support a crankshaft. The engine also includes a lubricant distribution sleeve which is mounted in the crankshaft bearing member for communicating with an engine lubrication system. The sleeve has an end which engages the bearing bushing and positions the bearing bushing within the crankshaft bearing member. The sleeve also includes a central bore and a radial port which communicate lubricant to the sleeve end and to the bearing bushing.
Preferably, the bearing bushing has a port formed therein which receives and engages the end portion of the sleeve. The bearing bushing also preferably includes an inner annular lubrication groove for distributing lubricant over the entire circumference of the bearing. Preferably, the lubrication groove is connected with the sleeve through the port, so that lubricant can flow from the sleeve to the lubrication groove or from the channel into the lubrication groove, depending upon how lubricant is provided. Lubricant is also supplied through the sleeve to the cylinder and piston or piston heads, to the crankshaft bearing, the bearing bushing. The end of the sleeve facing the cylinder forms a spray nozzle which can spray or distribute lubricant or coolant into regions of the cylinder block, so that these can be supplied uniformly with lubricant or coolant.
REFERENCES:
patent: 5072809 (1991-12-01), Shibata
patent: 5520466 (1996-05-01), Everitt et al.
patent: 5533472 (1996-07-01), Sands et al.
patent: 5896656 (1999-04-01), Laws
patent: 5915350 (1999-06-01), Suzuki et al.
patent: 6205971 (2001-03-01), Inumaru et al.
patent: 20 61 341 (1972-06-01), None
patent: 34 03 671 A1 (1985-07-01), None
patent: 0 982 479 A1 (2000-03-01), None
Deere & Company, “Engine System —Operation/Lubrication System”, Saran Liter Engines, Jul. 1999, p. 205-4.
Deere & Company
McMahon Marguerite
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