Gear pump with low pressure shaft lubrication

Details Gear pump with low pressure shaft lubrication Gear pump with low pressure shaft lubrication

1976-06-23

1978-05-23

Vrablik, John J.

Rotary expansible chamber devices

Methods

418 79, 418102, 418132, F01C 1908, F01C 2104, F01C 2102, F01C 118

Patent

active

040908208

ABSTRACT:
A gear pump is disclosed wherein the shafts of at least a pair of intermeshing gears are rotatably supported in bushings each with an axially extended lubrication groove formed in the bore of the bushing, one end of the lubrication groove being communicated through a low pressure chamber defined in the inner end face of the bushing with a portion of a suction port located adjacent to the root or dedendum circle of the gear while the other end of the lubrication groove being communicated with the suction port through a hole extended through the bushing or casing or notch formed therein, whereby part of the liquid drawn through the suction port upon rotation of the intermeshing gears is forced into the pressure chamber because of the fact that the liquid drawn into each tooth space of the gear is imparted with the impact speed directed in the radial direction of the tooth space due to the difference between the speed with which the liquid is drawn into the gear pump and the rotational speed of the intermeshing gears, and the liquid is circulated from the low pressure chamber through the lubrication groove, thereby lubricating and cooling the shafts rotating in the bushes.

REFERENCES:
patent: 2891483 (1959-06-01), Murray et al.
patent: 3447472 (1969-06-01), Hodges et al.
patent: 3490382 (1970-01-01), Joyner

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