Cellulose-containing gear
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsJunichi Tsuzuki, Sara Kusumoto
Life of this patent
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Abstract
A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 μm or lower.
Claims21
A gear which is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, wherein:
- the thermoplastic resin (A) includes a polyamide resin or a polyacetal resin,
- the thermoplastic resin (A) has a number average molecular weight in the range of 10,000 to 150,000, and
- a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 jam or lower.
A gear which is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, wherein:
- the gear has a roundness of 400 jam or smaller,
- the thermoplastic resin (A) includes a polyacetal resin, and
- the resin composition has a thixotropic index of 2 to 10 at a temperature of 25° C. higher than the melting point of the thermoplastic resin (A).
A gear system comprising:
- a gear mechanism constructed of a driven gear and a driving gear that engages with the driven gear, wherein the driven gear and/or the driving gear comprises a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, wherein:
- the thermoplastic resin (A) includes a polyamide resin or a polyacetal resin,
- a number average molecular weight of the thermoplastic resin (A) is in the range of 10,000 to 150,000, and
- in the driven gear and/or the driving gear, a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 jam or lower.
A gear system comprising:
- a gear mechanism constructed of a driven gear and a driving gear that engages with the driven gear, wherein the driven gear and/or the driving gear comprises a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, wherein:
- the thermoplastic resin (A) includes a polyamide resin or a polyacetal resin, and
- the resin composition has a thixotropic index of 2 to 10 at a temperature of 25° C. higher than the melting point of the thermoplastic resin (A).
Dependencies are inferred from the claim text.