Key to the Hartmann Rol-Vane Motor's high torque - low speed
operation and instant reversibility is the Rol-Vane principle.
The motor's dual-vane rotor and timed interval valving create
a hydraulically balanced unit, eliminating radial bearing
loads - a major cause of hydraulic motor wear.
- Optimum Rotary Rigidity
is achieved through use of a one-piece shaft-rotor assembly.
- Constant Velocity of Rotating
Elements - Absence of reciprocating and cam-operated
parts reduces wear and its associated problems.
- Uniformly Free Rotation
through its entire speed range is made possible by the motor's
unique pressure balancing system which eliminates hydraulic
loading and pressure locks.
- Minimum Breakaway Pressure
of 10 to 20 psi means high breakout torque efficiency.
- High Volumetric Efficiency
through use of precisely machined hardened steel rolling
vanes which act as non-wearing valving mechanisms.
- High Mechanical Efficiency
is theresult of close tolerance design and high degrees
- Wide-Speed Range - Infinite
speed variation can be had from a single motor, from a fraction
of an rpm through full rated speed.
- Quiet Operation makes the
Rol-Vane motor ideal for use where low noise level is a
HOW ROL-VANE WORKS
Hydraulic fluid from the supply line flows to the rotor
shaft via a combined body and shaft groove. Passages within
the rotor shaft direct the pressurized fluid radially into
the motor body's pressure chambers. Symmetrical passages conduct
the low pressure fluid back through the body to the discharge
port. Four rolling vanes sequence the fluid so that each of
the two rotor vanes always has high pressure against its trailing
surface and tow pressure fluid at its leading surface.