Hydraulic control system for vacuum sweeper trucks
First Claim
1. A hydraulic control system for a vacuum sweeper truck of the type including an internal combustion engine for propelling said truck, a cab within which the vehicle operator may sit, a vacuum pick-up head, a rotary sweeper mechanism for directing refuse to said vacuum pick-up head, and a dumping hopper movable between a loading and a dumping position, said hydraulic control system comprising:
- a hydraulic pump having an input port and an output port, said hydraulic pump being coupled to said internal combustion engine;
a reservoir of hydraulic fluid having an output port coupled to said input port of said hydraulic pump;
a hydraulic fan motor adapted to power a vacuum pump which provides vacuum to said vacuum pick-up head, said fan motor having an input port and an output port, said output port of said fan motor being coupled to an input port of said reservoir;
a hopper actuator having a pair of ports, where applying pressure to a first port causes said hopper to move towards said dumping position and where applying pressure to a second port causes said hopper to move towards said loading position; and
first valve means having three operative positions, where a first position couples said output port of said pump to said input port of said fan motor, a second position couples said output port of said pump to said first port of said hopper actuator and couples said second port of said hopper actuator to said input port of said fan motor, and a third position couples said output port of said pump to said second port of said hopper actuator and couples said first port of said hopper actuator to said input port of said fan motor.
0 Assignments
0 Petitions
Accused Products
Abstract
A hydraulic control system for a vacuum sweeper truck including a hydraulic pump coupled to the truck'"'"'s engine, a reservoir of hydraulic fluid, a hydraulic fan motor, a hopper actuator, and a valve assembly having three operative positions. In a first position the hopper actuator is deactivated and full power goes to the vacuum fan motor. In a second position the hydraulic fluid is diverted to the hopper actuator to raise the hopper and the vacuum fan motor is run at a reduced speed by hydraulic fluid returning to the reservoir. In a third position, the hydraulic fluid is again diverted to the hopper actuator to drive the hopper in a second direction, and again the fan motor is run at a reduced power level. A compensator is coupled to the hydraulic pump and is responsive to a cut-off setting and to the hydraulic pressure produced by the pump. A pressure adjustment means is provided in the cab of the truck which is coupled to the flow regulator to permit the truck operator to vary the cut-off setting of the flow regulator.
9 Citations
7 Claims
-
1. A hydraulic control system for a vacuum sweeper truck of the type including an internal combustion engine for propelling said truck, a cab within which the vehicle operator may sit, a vacuum pick-up head, a rotary sweeper mechanism for directing refuse to said vacuum pick-up head, and a dumping hopper movable between a loading and a dumping position, said hydraulic control system comprising:
-
a hydraulic pump having an input port and an output port, said hydraulic pump being coupled to said internal combustion engine; a reservoir of hydraulic fluid having an output port coupled to said input port of said hydraulic pump; a hydraulic fan motor adapted to power a vacuum pump which provides vacuum to said vacuum pick-up head, said fan motor having an input port and an output port, said output port of said fan motor being coupled to an input port of said reservoir; a hopper actuator having a pair of ports, where applying pressure to a first port causes said hopper to move towards said dumping position and where applying pressure to a second port causes said hopper to move towards said loading position; and first valve means having three operative positions, where a first position couples said output port of said pump to said input port of said fan motor, a second position couples said output port of said pump to said first port of said hopper actuator and couples said second port of said hopper actuator to said input port of said fan motor, and a third position couples said output port of said pump to said second port of said hopper actuator and couples said first port of said hopper actuator to said input port of said fan motor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification