Title:
歯車
Document Type and Number:
Japanese Patent JP4621253
Kind Code:
B2
Abstract:
The present invention is an injection-molded gear made of a polyacetal resin composition comprising a polyacetal and a filler having a particular shape and particle diameter. An object thereof is to provide a gear which has durability and is excellent in the balance between dimensional accuracy and rotation transmission accuracy. Specifically, the gear is an injection-molded gear made of a polyacetal resin composition comprising more than 5 and less than 100 parts by mass of a filler (II) having a particle size distribution satisfying a particular expression and an average aspect ratio (L/D), i.e., a ratio of an average major-axis length (L) of the particles to an average minor-axis length (D) of the particles, of less than 3 and 0 or less than 10 parts by mass of an organic acid (III) based on 100 parts by mass of a polyacetal (I), characterized in that the gear comprises 10% or less of aggregates of the filler (II) having an aggregate diameter of 3 µm or more.
Inventors:
Kenya Sonobe
Miho Konishi
Miho Konishi
Application Number:
JP2007526025A
Publication Date:
January 26, 2011
Filing Date:
July 19, 2006
Export Citation:
Assignee:
Asahi Kasei Chemicals Corporation
International Classes:
F16H55/06; B29C45/00; C08K3/00; C08K5/09; C08L59/02; B29K59/00; B29K105/16; B29L15/00
Domestic Patent References:
| JP2004506772A | 2004-03-04 | |||
| JP2004263026A | 2004-09-24 | |||
| JP2005187728A | 2005-07-14 |
Foreign References:
| WO2005071011A1 | 2005-08-04 |
Attorney, Agent or Firm:
Masami Sakai
Norio Kagami
Jun Komatsu
Norio Kagami
Jun Komatsu