Patent ID: 11891884
Assignee: TWIN DISC, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 0:
1. An electro-hydraulic high-pressure oilfield pumping system for driving a fracturing (frac) pump configured to pressurize a frac fluid for delivery into a well that extends into a subterranean geological formation, comprising:
a primary electric motor that has a motor shaft and defines a prime mover of the electro-hydraulic high-pressure oilfield pumping system;
a transmission with multiple ranges that provide multiple drive ratios, the transmission arranged between and configured to deliver power from primary electric motor to the frac pump;
a starting motor selectively delivering power through the transmission to rotate the motor shaft of the primary electric motor; and
wherein the starting motor is a hydraulic motor that defines a hydraulic starting motor.