초록 ▼

A drive assembly brake is mounted in the gearbox connecting a motor driven input shaft to an output shaft, the output shaft being connected by a tubing string to a submersed rotary pump. The gearbox includes an output shaft housing portion defining an oil chamber and an input shaft housing portion d

A drive assembly brake is mounted in the gearbox connecting a motor driven input shaft to an output shaft, the output shaft being connected by a tubing string to a submersed rotary pump. The gearbox includes an output shaft housing portion defining an oil chamber and an input shaft housing portion defining an oil-free centrifugal brake chamber. The relatively faster moving input shaft carries a centrifugal brake having weight members frictionally engageable with the brake chamber wall when the rotational speed of the input shaft reaches a sufficiently high degree, and the resulting braking action retards the rotation of the input shaft. In one embodiments a split casing gearbox is used having matched passage portions in the faces of the connected gearbox portions to form a lubrication passage system for the shaft bearings.

대표청구항 ▼

In a drive assembly connecting a motor to a submersible pump by means of a horizontal input shaft connected to the motor and a vertical output shaft rotated at a lower speed by the input shaft and connected to the submersible pump by a tubing string, an improvement comprising: (a) a gearbox includin

In a drive assembly connecting a motor to a submersible pump by means of a horizontal input shaft connected to the motor and a vertical output shaft rotated at a lower speed by the input shaft and connected to the submersible pump by a tubing string, an improvement comprising: (a) a gearbox including a first housing portion carrying the input shaft and a second housing portion carrying the output shaft, the first housing portion including a brake-receiving chamber having a brake shoe engageable surface, (b) a brake shoe carried by the input shaft within the brake-receiving chamber and movable radially outwardly under centrifugal force into engagement with said brake shoe engageable surface when the input shaft reversely rotates above a critical speed, and (c) means disengaging the brake shoe when the input shaft rotates below the critical speed.