Expansible chamber devices – With assembly or disassembly facilitating means
Patent
1995-08-31
1997-09-30
Denion, Thomas E.
Expansible chamber devices
With assembly or disassembly facilitating means
92187, 74579E, 1231971, F01B 2900
Patent
active
056716559
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a two-piece connecting rod to be mounted in a reciprocating hermetic compressor used in small machines, such as refrigerators, freezers, drinking fountains, etc.
BACKGROUND OF THE INVENTION
The reciprocating compressors present a connecting rod, which has a smaller eye articulated through a wrist pin to a reciprocating piston inside the cylinder of the compressor, and a larger eye mounted to an eccentric end of a crankshaft, which is orthogonal to the piston stroke, the other end of said crankshaft supporting the rotor of an electric motor, whereas the stator of the motor is supported on a cylinder block, lodging the bearing of the crankshaft, the block being mounted inside a case by means of springs, said case being closed by a cover, which defines a sealed unit.
In order to obtain a better performance of the compressor, it is important from the mechanical point of view that the parts with relative movement present perfect adjustments of their geometries, so as to avoid leakages, wear and minimize the frictions that lead to a loss of volumetric yielding.
Alterations in this characteristic of the piston affect the operation of the compressor.
Due to the small dimensions of the components and to the little space available for mounting the piston-connecting rod-eccentric pin assembly, different constructive solutions have been proposed for such assembly.
The document 4832/73/BR presents a constructive form, in which the spacing ring is pressed between the larger eye of the connecting rod and the eccentric pin. To permit assembling, this larger eye of the connecting rod has an internal diameter larger than the eccentric pin, the clearance therebetween being occupied by the above cited spacing ring. Besides requiring a rather complex mounting, such solution further requires careful manufacturing, in order to obtain precision of the components involved.
The documents PI 8103673/BR and EPO 81830119.4 propose as solution a slot in the lateral wall of the cylinder, in order to allow that the smaller eye of the connecting rod and the piston pin be introduced in the piston during the mounting process. Said slot in the cylinder wall has the disadvantage of reducing the rigidity of the part, causing dimensional deviations during the machining of the cylinder.
The document DE 3123708 A1 refers to a connecting rod, which has its larger eye divided in two pieces, the latter being joined through clamps. Nevertheless, this solution has a high number of components for a part, which would be simple in principle, besides keeping in movement an excessively increased mass.
Another constructive solution for a two-piece connecting rod is described in the patent application PI8501182/BR, in which the larger eye of the connecting rod incorporates a radial projection, provided with a longitudinal slot, which occupies at least a portion of the thickness of said radial projection, the smaller eye incorporating an elongated radial projection, defining the rod of the connecting rod, and an end portion, which is fitted in the longitudinal slot of the radial projection of the smaller eye. Although this solution requires a simple mounting of the parts of the two-piece connecting rod, the fastening of said parts is obtained by processes presenting inconveniences, such as the generation of residues during welding, for instance, or the need of long drying periods or variable resistance to time, due to the aging of the material, in the case adhesives are used for this purpose. One solution for fastening the two-piece connecting rod described above is proposed in the document PI8707047/BR, in which a fastening clamp is disposed in a housing, which is defined during the assembly of the portions of the two-piece connecting rod, and which is in the form of a slot provided at the portions of the rod of the connecting rod projecting from each of the larger and smaller eyes, transversely to the axis that joins both centers of said larger and smaller eyes. However, this solution requires high
REFERENCES:
patent: 4407168 (1983-10-01), Andrione et al.
patent: 4802382 (1989-02-01), Nissels
patent: 4930405 (1990-06-01), Lilie
patent: 5143470 (1992-09-01), Jimenez et al.
Denion Thomas E.
Empresa Brasileira de Compressores S/A - Embraco
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