Tooling for deep rolling fillets of crankshaft journals

• US 6,393,885 B1
• Filed: 11/07/2000
• Issued: 05/28/2002
• Est. Priority Date: 11/07/2000
• Status: Expired due to Fees

• Current Assignee: Hegenscheidt-MFD Corporation, Novozymes Biotech, Inc. (Novozymes)
• Original Assignee: Hegenscheidt-MFD Corporation
• Inventors: Cadena, Luis
• Primary Examiner(s): Tolan, Ed
• Application Number:
  US09/707,449
• Time in Patent Office: 567 Days
• Field of Search: 72/107,110 29/6.01,888.08
• US Class Current: 72/110
• CPC Class Codes: B24B 39/045 the working tool being composed of a plurality of working rolls or balls
• CPC Class Codes: B24B 5/42 for grinding crankshafts or crankpins
• CPC Class Codes: F16C 3/08 made in one piece features relating to lubrication F16C3/14, to cooling F16C3/16

Abstract

A rolling tool for deep rolling fillets of crankshaft journals is provided. The rolling force is divided and spread by the back up roller and directed onto the laterally spaced side shoulders of the workpiece roller. The fillet rolling forces are then recombined and directed into the fillet by the workpiece rollers which works and compressively stresses the fillets of the pin journals. With the rolling force between the backup rollers divided, there is reduced workpiece roller wear as compared to prior art backup roller designs.

Claims

1. A rolling tool for compressively rolling annular fillets of journals of a crankshaft for an internal combustion engine comprising a rotatable back-up roller having at least one annular and recessed track formed therein defined between spaced load transmitting annular shoulders, an annular workpiece roller of a predetermined diameter with an annular working edge having at least one predetermined radius and a pair of annular shoulders of a smaller diameter than the diameter of the annular working edge for rolling contact with the spaced shoulders of a back up roller for receiving rolling loads from the back up roller.

2. Fillet roller constructions for deep rolling the fillets of journals of engine crankshafts comprising a first annular roller for direct working engagement with the annular undercut defining the fillet formed between a journal and an adjacent counterweight, and an annular back up roller for direct operative engagement with the workpiece roller, said workpiece roller having an annular working edge of a predetermined diameter and a transversely curved working surface to operatively fit into the transverse curvature of the fillet, said working roller having shoulders on either side of said annular working edge, said back up roller having an annular groove therein for receiving said annular working edge of said workpiece roller, said workpiece roller having a pair of contact shoulders of a smaller diameter than the annular working edge of rolling contact on the spaced shoulders of said back up roller for receiving rolling loads from the back up roller.

3. Fillet roller tools for deep rolling the fillets of journals of engine crankshafts comprising a first annular roller for direct working engagement with the annular undercut defining the fillet formed between a journal and an adjacent counterweight and an annular back up roller for direct operative engagement with the workpiece roller, said workpiece roller having an annular working edge of a predetermined diameter and a transversely curved working surface profiled to operatively fit into the transverse curvature of the fillet, said workpiece roller further having an annular shoulder on opposite sides of said annular working edge, said back up roller having an annular groove therein for receiving with clearance said annular working edge of said workpiece roller and said back up roller having a pair of contact shoulders for contacting the annular shoulders on said workpiece roller so that a fillet rolling load applied to said back up roller is divided and spread to the workpiece roller through the annular shoulders thereof.

4. Deep rolling equipment for rolling the fillets of the pins of a crankshaft having a compound radius undercut comprising a work piece roller having an annular rolling edge with a compound radius rolling edge that operatively corresponds to the compound radius of the undercut, said equipment including a back up roller having an annular groove that receives with clearance the rolling edge and having a pair of annular work piece roller contact surfaces on either side of the annular groove therein that physically contact a pair of annular shoulders on opposite side of rolling edge of the work piece roller.