Title:
GEAR MADE OF THERMOPLASTIC RESIN AND METHOD AND MOLD FOR HOLLOW INJECTION MOLDING THEREOF
Document Type and Number:
Japanese Patent JP3108314
Kind Code:
B2
Abstract:
PURPOSE: To provide a gear made of a thermoplastic resin suppressed in shrinkage, enhanced in mold transfer properties, reduced in error as an involute gear and having good accuracy.
CONSTITUTION: In a gear made of a thermoplastic resin having a hollow part therein, at least one partition wall 6 is provided in the gear and the min. thickness thereof is 0.5-5mm. In the hollow injection molding of the gear, a mold having a structure capable of expanding the vol. in a mold cavity 7 is used and the expansion of the vol. in the cavity 7 is started simultaneously with the start of the injection of a pressure fluid or before 10sec is elapsed after the completion of injection and the pressure of the pressure fluid in a molded product is held for 5-90sec in such a state that expansion is completed.
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Inventors:
Norihiko Furuya
Kimihiro Kubo
Kimihiro Kubo
Application Number:
JP5562895A
Publication Date:
November 13, 2000
Filing Date:
March 15, 1995
Export Citation:
Assignee:
Asahi Chemical Industry Co., Ltd.
International Classes:
B29C33/42; B29C45/00; B29C45/17; B29C45/26; B29C45/56; B29D15/00; F16H55/06; B29L15/00; (IPC1-7): B29C45/26; B29C45/00; B29D15/00; F16H55/06
Domestic Patent References:
| JP6272748A |