Gear

Details Gear Gear

2006-07-19

2009-12-29

Lipman, Bernard (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S593000, C475S331000

Reexamination Certificate

active

07638569

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.

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Molded plastic Gear Handbook, 1995, 1stedition, ed. Molded Plastic Gear Research Expert Committee of Precision Engineering Institution, Published by Sigma, pp. 58-68.
Breakthrough and Applied Technology of Dispersion and Aggregation, 1992, 1stedition, ed. F. Kitahara, published by Techno System Co., pp. 237-237. an accompanied by an English language translation.

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