Tanker truck with soft start/stop system
OwnerLeRoy G. Hagenbuchinventor
Life of this patent
Estimating the term…
Abstract
A tanker vehicle for distributing liquid on a surface includes a chassis that supports a tank for holding the liquid. A fluid pump discharges the liquid from the tank and is driven by a hydraulic motor. A hydraulic system delivers hydraulic fluid to the motor through a supply line and returns the fluid to a tank through a return line. A bypass circuit is disposed between the supply line and the return line, bypassing the motor. The bypass circuit includes a system for providing a combination soft start and soft stop of the hydraulic motor that is configured to enable hydraulic fluid to flow from the supply line through the bypass circuit to the return line at a start of the hydraulic system and to flow from the return line through the bypass circuit to the supply line at a shutdown of the hydraulic system.
Claims19
A tanker vehicle for distributing liquid on a surface, the vehicle comprising:
- a chassis supported on a plurality of tires;
- a tank for holding the liquid and supported by the chassis;
- a fluid pump operable to discharge the liquid from the tank;
- a hydraulic motor coupled to the fluid pump and configured to drive the fluid pump;
- a hydraulic system to deliver hydraulic fluid to the hydraulic motor through a supply line in order to power the hydraulic motor and to return the hydraulic fluid through a return line to a hydraulic fluid tank;
- and
- a system for providing a combination soft start and soft stop of the hydraulic motor, the system including:
- a bypass circuit between the supply line and the return line, bypassing the hydraulic motor, and being configured to enable hydraulic fluid to flow from the supply line through the bypass circuit to the return line at a start of the hydraulic system, to decrease flow through the bypass circuit as a speed of the hydraulic motor increases, and to enable the hydraulic fluid to pass from the return line through the bypass circuit to the supply line at a shutdown of the hydraulic system as the speed of the hydraulic motor decreases.
A method of discharging liquid from a tanker truck, the method comprising:
- holding the liquid in a tank supported on a chassis of the tanker truck;
- operating a hydraulic system to deliver hydraulic fluid through a supply line to a hydraulic motor and through a return line back to a hydraulic fluid tank, the hydraulic motor driving a fluid pump in order to discharge the liquid from the tank of the tanker truck to distribute the liquid onto a surface;
- providing a bypass circuit between the supply line and the return line bypassing the hydraulic motor;
- enabling the hydraulic fluid to flow through the bypass circuit so as to bypass the hydraulic motor at a start of the hydraulic system as the hydraulic motor increases in speed;
- enabling the hydraulic fluid to flow from the return line through the bypass circuit to the supply line at a shutdown of the hydraulic system as the hydraulic motor decreases in speed.
Dependencies are inferred from the claim text.