Gear pump or motor with serrated grooves on inner wall for break

Details Gear pump or motor with serrated grooves on inner wall for break Gear pump or motor with serrated grooves on inner wall for break

1980-01-24

1982-06-15

Vrablik, John J.

Rotary expansible chamber devices

Methods

418179, 418206, 291564R, F01C 118, F01C 2110, F03C 208, F04C 218

Patent

active

043348408

ABSTRACT:
In order to prevent a decrease in volumetric efficiency from occurring when a gear pump or motor, 10, is operated at room temperature after operating at a lower temperature or when it is operated at a higher temperature after operation at a lower temperature, the housing, 13, containing two interlocking gears 17 and 18 is made of a ferrous material, which is the same as that of the two gears, and a large number of serrated grooves, 40, are disposed in the axial direction on the low pressure side of the inner wall surfaces of the gear bower 16. Therefore in the break-in operation of the gear pump or motor when the inner wall surfaces at the low pressure side of the gear bower are cut off by the tooth crests of the two gears, built-up edges, which are then formed on the tooth crests of these gears, can drop off immediately, owing to the occurrence of impact forces when they clash with the angular parts of the grooves, and result in a smooth break-in to inner wall surfaces at the low pressure side of the gear bower. Thus the use of housings made of ferrous materials is excellent for the above temperature characteristics.

REFERENCES:
patent: 2491677 (1949-12-01), McCulloch
patent: 2519557 (1950-08-01), Flanagan
patent: 3704968 (1972-12-01), Haupt

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