Heat systems for vehicles

DETAILED DESCRIPTION What we claim is: 1.
A vehicle having an engine and a chassis formed in two parts which are connected by a joint for pivotal movement about a vertical axis, a hydraulic circuit supplied with oil from a pump driven by said engine, and an operators enclosure including a heat exchanger, said heat exchanger being supplied with fluid from said hydraulic circuit, said engine being located on one of said parts and said operators enclosure being located on another of said parts.
2.
The vehicle of claim 1 wherein said heat exchanger is supplied with fluid by pipes connected in parallel with a low pressure zone of said hydraulic circuit.
3.
The vehicle of claim 2 wherein the connection between the heat exchanger pipes and the low pressure region includes a variable control device for varying the flow through the heat exchanger.




Description:
The invention relates to vehicles and in particular to centre pivot steered vehicles equipped with a hydraulic unit, such as wheel loaders, etcetera, in which the driving unit is situated on one part of the chassis and a heatable driver's cab and working equipment on the other part.
In known vehicles of this kind it is usual for the heating unit in the driver's cab to be driven by the cooling water of the engine.
This, however, necessitates the use of tubes or hoses and joints to convey the cooling water from the driving unit situated on one part of the chassis to the driver's cab situated on the other part.
These pipes are relatively long, which leads to loss of heat and also hinders the work of the pivot joint inserted between the two parts of the chassis, quite apart from the fact that the pipes are subjected to a particularly strong mechanical stress when the vehicle is running and are therefore easily damaged.
It is an object of the present invention to obviate or mitigate the above disadvantages.
According to the present invention there is provided a vehicle having a prime mover, an hydraulic circuit supplied with oil from a pump driven by the prime mover, and an operators enclosure including a heat exchanger, said heat exchanger being supplied with fluid from said hydraulic circuit