Expansible chamber devices – With force exerting means to move fluid from non-working...
Patent
1996-08-01
1998-04-28
Denion, Thomas E.
Expansible chamber devices
With force exerting means to move fluid from non-working...
92 82, 92156, 92157, 184 24, F15B 2104
Patent
active
057431680
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
The present invention relates to a device for the pressurized lubrication of an assembly between two mechanical components which can move with respect to each other, one of which is subjected to forces which are cyclically alternating in intensity but not in direction and of variable average intensity, these forces being transmitted to the other via a layer of oil filling an interstice having a defined area of action and located in the interface formed between the two mechanical components, which includes; comprising a hydraulic pump which includes a piston capable of moving axially in a cylinder between two positions, so as to form a chamber of variable volume, the maximum variation of which is called the swept volume of the pump, the chamber of variable volume being connected, through one-way communication means, to the above-mentioned means for supplying liquid lubricant, and emerging through the one-way communication means into the above-mentioned interstice, and elastic return means acting on the above-mentioned pump piston so as to work against the action of the pressure of the pressurized liquid lubricant; liquid lubricant being actuated directly by the above-mentioned cyclically alternating forces and by the return force of the above-mentioned elastic return means; piston to its initial rest position when the intensity of the alternating cyclic forces approaches or is close to its minimum cyclic value, an articulation component being interposed between the two mechanical components which can move with respect to each other, the articulation component interacting with the first of the two mechanical components so as to form, between their interacting faces, the above-mentioned interface, and with the second mechanical component so as to form the above-mentioned hydraulic pump.
The invention relates especially to a lubricated device such as an assembly between a connecting rod and a piston, these being articulated to each other, of a fluid-compressing reciprocating machine, such as for example, a connecting rod/piston assembly of a two-stroke internal- or external-combustion reciprocating engine or a positive-displacement compressor. The invention relates especially to those of these assemblies in which the piston possesses, inside an externally cylindrical skirt, a bearing surface which may or may not be partially spherical and is intended to accommodate in an articulated manner the small end, which may or may not be partially spherical, of the connecting rod. Such devices are described in European Patent EP-A-0,280,622 and include: axis is parallel to the main axis of the connecting rod; head so as to compress a fluid and having, in its lower part, a recess in which the small end of the connecting rod is housed; and the piston, which has an external surface which interacts in its upper part, with a minimum functional clearance, with the internal surface of the above-mentioned recess made in the lower part of the piston; extremity made in the form of a cylindrical bush forming a piston and the other having a blind bore in which the above-mentioned extremity in the form of a cylindrical bush slides, with a minimum functional clearance, so as to delimit a first cavity or chamber of variable volume; above-mentioned first cavity of variable volume communicate, through a suction valve, with low-pressure supply means made in the connecting-rod shank and, through a delivery valve, with the above-mentioned interstice located in the interface between the internal surface of the above-mentioned recess made in the lower part of the piston and the upper external surface of the above-mentioned articulation component; cylindrical bush and the upper surface of the blind bore in which this above-mentioned extremity slides; return means and of the suction and delivery valves forming a high-pressure hydraulic pump actuated by the pressure of the compressed fluid which is exerted on the piston.
It is known that the lubrication of the connecting rod/piston articulation is critical in reciproca
REFERENCES:
patent: 2066489 (1937-01-01), Shannon
patent: 2108532 (1938-02-01), Frelin
patent: 2380907 (1945-07-01), Hall
patent: 3380556 (1968-04-01), Whitehead
patent: 4552344 (1985-11-01), Johnson
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