Injection-molded gear for engine and manufacturing method theref

Details Injection-molded gear for engine and manufacturing method theref Injection-molded gear for engine and manufacturing method theref

1996-09-25

1998-03-03

Herrmann, Allan D.

Machine element or mechanism

Gearing

Rotary bodies

2989337, 74DIG10, 264259, 26432817, 26433119, 264101, F16H 5506, F16H 5514

Patent

active

057222959

ABSTRACT:
An injection-molded gear for an utility engine has a high reliability, tenacity, and accuracy, capable of being manufactured at low cost without requiring cutting, and ensuring a substantial reduction in noise. An inner part of a cam crankshaft gear is formed of an insert ring of a sintered iron alloy. An outside portion and a toothed crest portion of the gear are formed by injection-molding a polyamide resin such as nylon 66 and heat-treating the resulting molded product so that its relative viscosity is equal to or larger than 3.5. The relative viscosity is defined as .eta./.eta..sub.0 where .eta..sub.0 is a viscosity of sulfuric acid of 98% concentration and .eta. is a viscosity of a solution of the 98% sulfuric acid in which the polyamide resin is dissolved at a concentration of 1.0%.

REFERENCES:
patent: 4110054 (1978-08-01), Moeller Jr.
patent: 4433964 (1984-02-01), Holtzberg et al.
patent: 4715243 (1987-12-01), Morishita et al.
patent: 4777204 (1988-10-01), Ikenaga et al.
patent: 5059464 (1991-10-01), Mikuni

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