US 5,085,269 AGranted

Hydraulically driven heating and air conditioning system for vehicles such as mobile cranes

AssigneeSanden Corporation

InventorYorikazu Aoki

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Abstract

An air conditioning system for vehicles includes a hydraulic circuit having a hydraulic motor and a radiator and a refrigerating circuit having a compressor connected to the hydraulic motor and an evaporator disposed in an air conditioning air duct. The system includes a first pump supplying oil to the hydraulic motor and a second pump supplying the oil to the radiator disposed in the air conditioning air duct. A clutch controls the connection of the hydraulic motor and the compressor. A valve is provided between the second pump and the radiator for generating a pressure difference in the oil between the entrance and exit sides of the valve in order to raise the temperature of the oil. A switching mechanism switches the flow of the oil between a first pathway where the valve is located and a second pathway. The system can operate as a heating system by driving the second pump and passing the oil through the valve; as an air cooling system by driving the compressor and preventing the operation of the valve; and as a dehumidification and heating system by driving the compressor and operating the valve.

Claims16

Dependent claims

An air conditioning system for vehicles including a hydraulic circuit having a hydraulic motor and a radiator radiating the heat of a hydraulic oil, and a refrigerating circuit having a compressor connected to said hydraulic motor and an evaporator disposed in an air conditioning air duct, said air conditioning system comprising:

a first hydraulic pump provided in said hydraulic circuit for supplying said hydraulic oil to said hydraulic motor and a second hydraulic pump provided in said hydraulic circuit for supplying said hydraulic oil to said radiator, said radiator being disposed in said air conditioning air duct;
a first clutch mechanism provided between said hydraulic motor and said compressor for controlling the connection of said hydraulic motor and said compressor;
a first fluid pathway defined between said radiator and said second hydraulic pump and a second fluid pathway extending in parallel to said first fluid pathway;
a valve means provided in said first fluid pathway for generating a pressure difference in said hydraulic oil between the entrance and exit sides of said valve means;
and
a first switching means provided in said hydraulic circuit for switching the flow of said hydraulic oil between said first pathway where said valve means is located and said second pathway.

3 more elements

Dependencies are inferred from the claim text.