Variable Speed Hydraulic Pump Apparatus and Method
AssigneeSPX Corporation
InventorMichael T. Landrum
Life of this patent
Estimating the term…
Abstract
An embodiment in accordance with the present invention provides a hydraulic pump including a first motor running at a fixed speed, a reservoir for fluid and a first pump operatively coupled to the motor such that the pump runs at the same speed as the motor and generates a flow of fluid from the reservoir. The hydraulic pump further includes a second motor, a speed control valve operatively coupled to the to the first pump and operatively coupled to the second motor such that a portion of the flow is directed to the second motor and the remainder of the flow is diverted to the reservoir, and a second pump operatively coupled to the second motor such that the second pump is driven by the second motor.
Claims20
A hydraulic pump comprising:
- a first motor running at a fixed speed;
- a reservoir for fluid;
- a first pump operatively coupled to the motor such that the pump runs at the same speed as the motor and generates a flow of fluid from the reservoir;
- a second motor;
- a speed control valve operatively coupled to the first pump and operatively coupled to the second motor such that a portion of the flow is directed to the second motor and the remainder of the flow is diverted to the reservoir;
- a second pump operatively coupled to the second motor such that the second pump is driven by the second motor.
A hydraulic pump comprising:
- a motor means;
- a means for containing a fluid;
- a first means for pumping a fluid operatively coupled to the motor means such that the means for pumping a fluid runs at the same speed as the motor means and generates a flow of fluid from the reservoir;
- a second motor means;
- a means for controlling speed operatively coupled to the first pump and operatively coupled to the second motor such that a portion of the flow is directed to the second motor and the remainder of the flow is diverted to the reservoir;
- a second means for pumping the fluid operatively coupled to the second motor means such that the second pump is driven by the second motor means.
A method of manufacturing a hydraulic pump comprising:
- coupling a first motor to a fixed speed pump such that the fixed speed
- pump runs at the same speed as the motor;
- coupling the fixed speed pump to a speed control valve;
- coupling the speed control valve to a second motor such that the speed control valve passes a flow of a fluid to the second motor in order to achieve a predetermined speed for the second motor;
- and
- coupling the second motor to a variable speed high pressure pump, such that the variable speed high pressure pump is driven by the second motor.
Dependencies are inferred from the claim text.