Title:
樹脂製歯車、樹脂製歯車の射出成形方法、樹脂製歯付きベルト用プーリ、及び樹脂製回転体
Document Type and Number:
Japanese Patent JP6632921
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an excellent shape accuracy such as a roundness and reduce an occurrence of a weld line even in an injection molding with one gate so as to improve usage efficiency of a resin material. SOLUTION: In a resin gear 1, a web 2 has another side surface 2b on which a first annular rib 10 and a second annular rib 11 are formed to be concentric with a boss 3. The web 2 has an inner web portion 13 that couples the first annular rib 10 to the second annular rib 11, and an outer web portion 14 that couples the second annular rib 11 to a rim 6. The inner web portion 13 is formed to have a thickness gradually reduced from one intersection point 16 toward another intersection point 17, the intersection points 16 and 17 being intersection points of a virtual radial direction line 15 passing through a center of the boss 3 with the second annular rib 11. The first annular rib 10 has a side surface 10c on which only one gate mark 20a of an injection molding is formed at a position on a radially outer side with respect to a first tooth portion 5 and a position biased to the other intersection point 17 on the virtual radial direction line 15.
Inventors:
Kazuyuki Sakamaki
Tetsuya Tokiwa
Tetsuya Tokiwa
Application Number:
JP2016058726A
Publication Date:
January 22, 2020
Filing Date:
March 23, 2016
Export Citation:
Assignee:
Enplus Inc.
International Classes:
F16H55/06; B29C33/42; B29C45/37; F16H55/48
Domestic Patent References:
| JP58026524U | ||||
| JP2002295643A |
Attorney, Agent or Firm:
Onuki Kotake International Patent Office