(57) The present invention relates to a motor-driven compressor unit, particularly for
airtight compressors on refrigerating machines, comprising a main part (1), a crankshaft
(3) which rotates in a first seat in the main part (1) and the crank pin (4) of which
constitutes one end of the shaft, a piston (2) which slides in a second seat in the
main part (1), and a single-piece connecting rod (5) coupled directly to the crank
pin (4) with no parts inbetween and to the piston (2) by means of a pin (8). In one
arrangement of the present invention, an opening (10) is made in the piston slide
seat nearest the crank pin (4) so that parts may be assembled in the following order:
crankshaft (3) in the main part (1) with the crank pin (4) in the bottom dead centre
position; connecting rod (5) straight inside the crank pin (4) through the said opening
(10); piston (2) in the cylindrical seat; pin (8) in the piston (2) and connecting
rod (5). Besides making assembly easier, this arrangement reduces the number of component
parts required as well as friction and total weight.
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