Hydrostatic Fan Drive Systems: Hydrostatic fan drive systems basically consist of three main components: In HALDEX Fan Drives the hydraulic pump and hydraulic motor are designed as a compact and cost efficient gear unit with optional integrated control features. Motors • W-series motors WM600, WM900, WM1500 • Displacement range 3 … 50 cc/rev • Pressure range p1 up to 276 bar • Uni- or birotational • Outboard bearing optional • Optional valve features: - Anticavitation check valve - Relief valve - 2-speed selection valve - Thermal valve - Prop-pressure relief valve - Reversible rotation valve - Electronic control unit & temperature sensor Pumps •W-series pump W600, W900, W1500 • Displacement range 3 … 50 cc/rev •Pressure range p1 up to 276 bar • Optional valve features: - Priority flow control - LS priority flow control - Relief valve Haldex Fan Drive Systems • Hydraulic pump • Hydraulic motor (with fan) • Cooling unit The following sketch shows the schematic design of a hydrostatic fan drive system: Descriptions: 1. Diesel motor 2. Power-take-off (PTO) 3. Hydraulic pump 4. Hydraulic motor 5. Hydraulic tank 6. Impeller 7. Prop. pressure relief valve 8. Electronic unit (ECU) 9. Plug for signal input 10. Digital signal (z. B. air conditioner or retarder) 11. Oil cooling unit (1-circuit design) 12. Water cooling unit (2-circuit design) 13. Temperature sensor cooling circuit 1 14. Temperature sensor cooling circuit 2 1 2 3 4 6 7 8 9 10 Cooled water Heated water 5 11 12 13 14 Heated oil Cooled oil quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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