Title:
【発明の名称】動圧軸受の製造方法
Document Type and Number:
Japanese Patent JP3056024
Kind Code:
B2
Abstract:
PURPOSE:To minimize an effect of a shrinkage of a resin on an inner peripheral side to prevent the deformation of the inner periphery to produce a dynamic pressure bearing having a good bearing performance. CONSTITUTION:An insert member 2 made of a small-diameter shaft part 2a having a pattern 11 for forming dynamic pressure grooves on the outer periphery thereof and a large-diameter shaft part 2b is fitted into a hole made of a small- diameter cylindrical part 1a and a large-diameter cylindrical part 1b in a mold 1. A sleeve 3 is tightly fitted into between the small-diameter cylindrical part 1a of the mold 1 and the small-diameter shaft part 2a of the insert member 2 so that the end face of the sleeve 3 is positioned beyond a stepped part 1c of the mold 1 toward the large-diameter shaft part 2b of the insert member 2. A gate member 4 is tightly fitted into between the inner periphery of the large-diameter cylindrical part 1b of the mold 1 and the outer periphery of the large-diameter shaft part 2b of the insert member 2 so that the end face thereof is positioned outside a stepped part 2c of the insert member 2. A resin melted by heating is injected into a space 10 formed by the mold 1, the insert member 2, the sleeve 3, and the gate member 4 through a path provided in the gate member 4.
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Inventors:
Takeshi Takahashi
Masayoshi Ohnishi
Masayoshi Ohnishi
Application Number:
JP17786993A
Publication Date:
June 26, 2000
Filing Date:
July 19, 1993
Export Citation:
Assignee:
Koyo Seiko Co., Ltd.
International Classes:
B29C45/14; B29C47/02; F16C33/20; B29L31/00; (IPC1-7): B29C45/14; B29C47/02; F16C33/20
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)