Machine element or mechanism – Gearing – Teeth
Patent
1992-05-19
1994-01-18
Herrmann, Allan D.
Machine element or mechanism
Gearing
Teeth
2989331, 74425, 409 48, B23F 1300, F16H 116, F16H 5506
Patent
active
052791742
ABSTRACT:
A worm speed reducer consisting of a worm made of a relatively hard material such as cast iron or steel and a worm wheel made of a relatively hard material such as cast iron. A material strength is set so that an amount of wear of the worm becomes larger than that of the worm wheel. A tooth surface of the worm wheel is formed with a network irregularity extending in both a direction of a cutting scratch due to cutting and a direction intersecting the direction of the cutting scratch, and also formed with a chemical conversion coating having a thickness smaller than a height of the irregularity. A tooth surface of the worm is formed with a network irregularity extending in both a direction of a cutting scratch due to cutting (or a grinding scratch due to grinding) and a direction intersecting the direction of the cutting scratch (or the grinding scratch) of the worm, and also formed with a chemical conversion coating having a thickness smaller than a height of the irregularity of the worm. Accordingly, seizure resistance can be maintained not only in an initial stage of operation but also after operating the worm speed reducer for a long period of time, irrespective of the use of low-cost cast iron.
REFERENCES:
patent: 3368263 (1968-02-01), Harris, Jr.
patent: 3396595 (1968-08-01), Niemann
patent: 3812737 (1974-05-01), Campbell et al.
Herrmann Allan D.
Sumitomo Heavy Industrie's, Ltd.
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