BD Series
GENERAL CHARACTERISTICS AND FEATURES
The B series five cylinder crankshaft design radial piston hydraulic motor
utilises many of the proven components from the GM series motors, well known
for their high performance and reliability. The innovative design of the new
sliding central bearing arrangement, made possible by the latest materials
and manufacturing techniques increases the range of possible options in SAI
hydraulic motors. These include the possibility to change displacement, fit
taper roller barings for axial load capability, have a hollow through shaft
option, and fit a counterbalance weight to smooth out high speed vibration.
It’s also possible to accept higher radial loading of the motor shaft due to
a larger cross section giving extra strenght. CHANGE OF DISPLACEMENT
Change of motor displacement in the BD series is achieved by changing the
stroke of the crankshaft : min.20 bar - max- 30 bar. The change This can 0be
achieved by a low pressure external pilot signal and changes from high to low
displacement and vice versa can take place both dynamically, with a smooth
speed variation, and statically.The BD series motors can be freewheeled
in full cavitation. DESIGN AND OPERATION
The sliding bearing has an extremely low coefficient of friction and as a
consequence gives very high starting torque efficiency, and continues to
achieve higher then average mechanical efficiencies both in high and low
displacement modes. At present, the maximum running speed is restricted to
the flow which can pass through distributor which is fitted to this series
of motors. STARTING AND LOW SPEED TORQUE
The motors are capable of working at low speeds with a high degree of speed
stability. The minimum stable speed depends on the displacement of the motor.
Output torque remains very constant and does not fall away at very low speeds
or under stall or start conditions.
general characteristics and features 
|
||||
| article | click to enlarge the photo |
displacement (cm³/rev) |
specific torque (Nm/bar) |
technical data pdf |
| BD1 | |
|||
| BD2 | |
|||
| BD5 | |
|||