Title:
被嵌着物が嵌着される軸線方向の条痕が形成された軸及び条痕形成方法
Document Type and Number:
Japanese Patent JP4423085
Kind Code:
B2
Abstract:
A plurality of axial grooves are formed on the outer circumferential surface of a shaft member by applying an arcuate edge defined between an end surface and outer circumferential surface of a rotatable cylindrical forming tool having a generally smooth surface. Typically, the rotational center of the forming tool is tilted backward as it is moved along the length of the shaft member. Owing to the plastic flow of the material of the shaft member, a pair of ridges are formed on either side of the groove. The end surface of the forming tool causes a more pronounced plastic flow than the outer circumferential surface of the forming tool so that one of the ridges is greater in height and higher in hardness than the other. This provides various benefits when this shaft member is press fitted into a bore of an armature core or the like.
Inventors:
Zenjoji Mamoru
Application Number:
JP2004101995A
Publication Date:
March 03, 2010
Filing Date:
March 31, 2004
Export Citation:
Assignee:
Mitsuba Co., Ltd.
International Classes:
F16C3/02; B21D7/02; B21D13/02; B21D17/02; B21J5/02; B21J9/02; B21K25/00; F16C3/00; F16D1/06
Domestic Patent References:
| JP9088988A | ||||
| JP2001020966A | ||||
| JP2001009644A | ||||
| JP5200475A | ||||
| JP7259872A |
Attorney, Agent or Firm:
Yoichi Oshima