Method for making rotor counterweight insert apparatus

• US 5,495,885 A
• Filed: 05/18/1995
• Issued: 03/05/1996
• Est. Priority Date: 07/25/1994
• Status: Expired due to Fees

• Current Assignee: Tecumseh Products Company
• Original Assignee: Tecumseh Products Company
• Inventors: Fowlkes, Jeffrey C., Gilmore, Gary L.
• Primary Examiner(s): Rowan, Kurt
• Assistant Examiner(s): LIN, ING HOUR
• Application Number:
  US08/443,855
• Time in Patent Office: 292 Days
• Field of Search: 164/98, 164/112, 164/108, 164/109, 164/110, 164/111
• US Class Current: 164/98
• CPC Class Codes: F04B 35/04 the means being electric
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 2230/60 Assembly methods
• CPC Class Codes: F04C 2240/807 Balance weight, counterweight
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/0021 Systems for the equilibration of forces acting on the pump interstice adjustment other than by fluid pressure F01C21/102
• CPC Class Codes: F16F 15/28 Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft rotating balancer shafts F16F15/264; correcting-weights for balancing rotating bodies F16F15/32; Attaching or mounting same
• CPC Class Codes: F16F 15/322 the rotating body being a shaft F16F15/34, F16F15/36 take precedence
• CPC Class Codes: H02K 15/165 Balancing the rotor
• CPC Class Codes: H02K 7/04 Balancing means

Abstract

A hermetic compressor assembly is disclosed including a motor compressor disposed within a hermetically sealed housing, wherein the housing has an oil sump in the bottom thereof from which oil is drawn to lubricate the compressor mechanism. An electric drive motor includes a vertical rotor having a lower axial end ring with rotor counterweight die cast therein, whereby turbulence and resulting agitation of the oil in the oil sump is prevented during rotation of the rotor. By die casting the counterweight within the end ring additional attachment parts and manufacturing steps are eliminated.

Claims

1. A method of manufacturing a rotor end ring, said method comprising:

providing a mold with a cavity having the form of a rotor end ring;

inserting a counterweight into said cavity; and

pouring molten metal into said cavity to die cast a rotor end ring about said counterweight.

2. The method of claim 1 in which said insertion step includes attaching said counterweight to said mold to prevent counterweight movement during the pouring of molten metal.

3. The method of claim 1 in which said pouring step includes pouring only enough metal into said mold cavity to form the surface layer of the rotor end ring coplanar with a surface of said counterweight.