System and method for cracking a connecting rod
AssigneesToyota Motor Engineering & Manufacturing North America, Inc., Toyota Jidosha Kabushiki Kaisha
InventorsCraig Allen Buchanan, Adam Joseph Haynes, Toshiki Fujikawa, Yasuhiro Waki, Yuya Fukaya
Life of this patent
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Abstract
A method for creating a cracking line in a connecting rod includes etching, using a first pass of a laser, a groove in an inner surface of a larger bore of a connecting rod by removing material from the inner surface. The groove may be discontinuous and include a plurality of holes that are spaced apart and have different depths. The method further includes removing more material from the groove using a second pass of the laser to increase the depths of the holes, thereby increasing the stress concentration factor of the groove.
Claims8
A method for creating a cracking line in a connecting rod, the method comprising:
- etching, using a first pass of a laser, a groove in an inner surface of a larger bore of the connecting rod by removing material from the inner surface, the groove being discontinuous, including a plurality of holes that are spaced apart and that have different depths, and including at least a first segment containing a first group of holes, a second segment containing a second group of holes, and a third segment containing a third group of holes;
- and
- removing more material from the groove using a second pass of the laser with a different number of laser pulses for each of the first segment, the second segment, and the third segment to increase the depths of the holes to a different depth for each of the first segment, the second segment, and the third segment, thereby increasing a stress concentration factor of the groove.
A method for creating a cracking line in a connecting rod, the method comprising:
- etching, using a first pass of a laser, a groove in an inner surface of a larger bore of the connecting rod by removing material from the inner surface, the groove being discontinuous and including a plurality of holes that are spaced apart and that have different depths;
- removing more material from the groove using a second pass of the laser to increase the depths of the holes, thereby increasing a stress concentration factor of the groove, wherein the groove includes a first groove segment containing a first group of holes, a second groove segment containing a second group of holes, and a third groove segment containing a third group of holes;
- and
- using the first pass of the laser:
- etching the holes of the first groove segment using five pulses to achieve a depth of 0.38 millimeters for the first group of holes;
- etching the holes of the second groove segment using six pulses to achieve a depth of 0.45 millimeters for the second group of holes;
- and
- etching the holes of the third groove segment using four laser pulses to achieve a depth of 0.32 millimeters for the third group of holes.
A method for creating a cracking line in a connecting rod, the method comprising:
- etching, using a first pass of a laser, a groove in an inner surface of a larger bore of the connecting rod by removing material from the inner surface, the groove being discontinuous and including a plurality of holes that are spaced apart and that have different depths;
- removing more material from the groove using a second pass of the laser to increase the depths of the holes, thereby increasing a stress concentration factor of the groove, wherein the groove includes a first groove segment containing a first group of holes, a second groove segment containing a second group of holes, and a third groove segment containing a third group of holes;
- and
- using the second pass of the laser:
- etching the holes of the first groove segment using an additional five pulses to increase the depth of the first group of holes to 0.45 millimeters;
- etching the holes of the second groove segment using an additional six pulses to increase the depth of the second group of holes to 0.51 millimeters;
- and
- etching the holes of the third groove segment using an additional four pulses to increase the depth of the third group of holes to 0.37 millimeters.
Dependencies are inferred from the claim text.