Hydraulic wave tuner
AssigneeDeere & Company
InventorPeter E. Bingham
Life of this patent
Estimating the term…
Abstract
A work vehicle has a chassis, and a member connected to the chassis for movement with respect to the chassis. An actuator is connected to the chassis and to the member to move the member with respect to the chassis. A hydraulic circuit is connected to the actuator and a pump pressurizes fluid in the hydraulic circuit. An adjustable quarter wave tuner is connected to the hydraulic circuit. The adjustable quarter wave tuner has a length that is adjustable within a range of lengths to thereby reduce noise caused by the pump across a corresponding range of frequencies. In some embodiments, the member is a linear actuator, such as a hydraulic cylinder. In other embodiments, the member is a rotary actuator, such as a hydraulic motor.
Claims18
A work vehicle comprising:
- a chassis;
- a member connected to the chassis for movement with respect to the chassis;
- an actuator connected to the chassis and to the member, the actuator configured to move the member with respect to the chassis;
- a hydraulic circuit fluidly connected to the actuator;
- a pump configured to pressurize fluid in the hydraulic circuit;
- an adjustable quarter wave tuner fluidly connected to the hydraulic circuit, the adjustable quarter wave tuner having a length that is adjustable within a range of lengths to thereby reduce noise caused by the pump across a corresponding range of frequencies;
- a controller;
- and
- a sensor in electrical communication with the controller, the sensor positioned proximate to the adjustable quarter wave tuner, the sensor configured to sense a pressure in the hydraulic circuit and to communicate the sensed pressure to the controller,
- wherein the controller is configured to determine a present length of the adjustable quarter wave tuner and to determine a desired length of the adjustable quarter wave tuner based upon the sensed pressure.
A work vehicle comprising:
- a chassis;
- a member connected to the chassis for movement with respect to the chassis;
- an actuator connected to the chassis and to the member, the actuator configured to move the member with respect to the chassis;
- a hydraulic circuit fluidly connected to the actuator;
- a pump configured to pressurize fluid in the hydraulic circuit;
- an adjustable quarter wave tuner fluidly connected to the hydraulic circuit, the adjustable quarter wave tuner having a length that is adjustable within a range of lengths to thereby reduce noise caused by the pump across a corresponding range of frequencies,
- wherein the adjustable quarter wave tuner includes a longitudinally extending sleeve having a first end connected to the hydraulic circuit and a second end spaced from the first end, the adjustable quarter wave tuner also includes a plunger positioned within the sleeve, the plunger is configured to move in a longitudinal direction between a first end position and a second end position.
A hydraulic circuit comprising:
- a reservoir configured to retain hydraulic fluid;
- an actuator fluidly connected to the reservoir;
- a pump fluidly connected to the reservoir and to the actuator, the pump configured to move fluid from the reservoir to the actuator;
- an adjustable quarter wave tuner fluidly connected to the actuator and to the pump, the adjustable quarter wave tuner having a length that is adjustable within a range of lengths to thereby reduce noise caused by the pump across a corresponding range of frequencies;
- a first sensor positioned upstream of the adjustable quarter wave tuner, the first sensor configured to sense a first pressure in the hydraulic circuit;
- a second sensor positioned downstream of the adjustable quarter wave tuner, the second sensor configured to sense a second pressure in the hydraulic circuit;
- and
- a controller in communication with the first sensor to receive the first pressure from the first sensor, and in communication with the second sensor to receive the second pressure from the second sensor, the controller connected to the adjustable quarter wave tuner to thereby adjust the length of the adjustable quarter wave tuner in response to the first pressure and the second pressure;
- wherein the controller is configured to convert the first pressure into a first signal, is configured to convert the second pressure into a second signal, and is configured to combine the first signal and the second signal into a combined signal.
Dependencies are inferred from the claim text.