Title:
チェーン用油溜まり盲溝付ブシュの製造方法
Document Type and Number:
Japanese Patent JP4942593
Kind Code:
B2
Abstract:
A method of making a bushing 100 with blind grooves used as oil reservoirs for a chain, by which a number of blind grooves 112 for oil reservoirs are provided in an axial direction on an inner circumferential surface of a cylindrical steel member in forging processes comprises the steps of: fitting one end of a cylindrical steel member 106 to blind groove forming protrusions HP1 of a hollow die pin HP contained in a blind groove forming die D6, pressing the blind groove forming protrusions HP1 against an inner circumferential surface of the cylindrical steel member 106 while a diameter widening center pin EP inserted from the other end to the one end of the cylindrical steel member 106 is abutted and held on a front end inner circumferential portion HP3 of the hollow die pin HP and pushing a blind groove forming punch P6 into the blind groove forming die D6 while pressing the other end of the cylindrical steel member 106 and sliding an inner circumferential surface 111 of the cylindrical steel member 106 with respect to blind groove forming protrusions HP1.
Inventors:
Hirofumi Miki
Application Number:
JP2007234927A
Publication Date:
May 30, 2012
Filing Date:
September 11, 2007
Export Citation:
Assignee:
Tsubakimoto Chain Co., Ltd.
International Classes:
B21L11/00; B21D5/12; F16C17/02; F16C33/10; F16G13/02; F16G13/06
Domestic Patent References:
| JP2008196530A | ||||
| JP2006316829A | ||||
| JP3126970U | ||||
| JP2005344886A | ||||
| JP2005330997A |
Attorney, Agent or Firm:
Takashi Tsuno
Masayuki Miyake
Atsuo Kawai
Masayuki Miyake
Atsuo Kawai