MOUNTING ARRANGEMENT FOR A PISTON-CONNECTING ROD ASSEMBLY IN A REFRIGERATION COMPRESSOR

摘要

The arrangement is applied to a compressor which comprises: a crankcase, carrying a cylinder provided with a lateral slot and in which is housed a piston provided with two radial holes and with an eccentric axial hole; a connecting rod connected to a crankshaft driven by an electric motor and having a smaller eye mounted in the piston; and a wrist pin having a first end turned to the bearing hub of the crankcase, a second end turned to the lateral slot of the cylinder and a diametrical hole, adjacent to the second end in which is provided an engaging means, for the axial and rotational coupling of a tool for mounting and indexing the wrist pin, in the interior of the piston, in a position in which the diametrical hole is axially aligned with the eccentric axial hole, so as to allow an elastic pin to be introduced in said diametrical hole and in said eccentric axial hole.

主权项

1. A mounting arrangement for a piston-connecting rod assembly in a refrigeration compressor of the type which comprises a crankcase which defines a bearing hub and carries a cylinder provided with a lateral slot on a side opposite to the bearing hub; a piston, having an outer cylindrical surface and reciprocating in the interior of the cylinder and provided with two diametrically opposite radial holes and with an eccentric axial hole; a connecting rod having a smaller eye mounted in the interior of the piston; a wrist pin having a first end turned to the bearing hub and disposed in the interior of a radial hole of the piston, and a second end turned to the lateral slot of the cylinder and disposed in the interior of other radial hole of the piston, said wrist pin being also provided with a diametrical hole, adjacent to said second end and to be axially aligned with the eccentric axial hole of the piston; and an elastic pin to be introduced in the eccentric axial hole of the piston and through the diametrical hole of the wrist pin, said arrangement being characterized in that the second end of the wrist pin is provided with an engaging means for the axial and rotational coupling of a tool, for mounting and indexing the wrist pin in the interior of the piston, the outer cylindrical surface of the piston defining a travel end stop against which is seated the tool, in a condition in which the diametrical hole of the wrist pin has its axis coplanar to the axis of the eccentric axial hole of the piston.