Danfoss LPV Technical Information page 11

Technical Information
LPV Axial Piston Pumps
System design parameters
© Danfoss | September 2017
flange, the load orientation relative to the internal loads, and the operating pressures of the hydraulic
unit. In applications with external shaft loads, you can minimize the impact on bearing life with proper
orientation of the load.
Optimum pump orientation is a consideration of the net loading on the shaft from the external load, the
pump rotating group and the charge pump load.
•
In applications where the pump is operated such that nearly equal amounts of forward vs reverse
swashplate operation is experienced; bearing life can be optimized by orientating the external side
load at 0° or 180° such that the external side load acts 90° to the rotating group load.
•
In applications where the pump is operated such that the swashplate is predominantly (> 75 %) on
one side of neutral (ie vibratory, conveyor, typical propel); bearing life can be optimized by
orientating the external side load generally opposite (90° or 270°) the internal rotating group load.
The direction of internal loading is a function of rotation and which system port has flow out. Contact
Danfoss for a bearing life review if external side loads are present.
You can calculate the maximum allowable radial load (R
external moment (M ) from the table on the next page, and the distance (L) from the mounting flange to
e
the load.
R = M / L
e e
Avoid thrust loads in either direction.
If continuously applied external radial loads are 25% of the maximum allowable or more, or thrust loads
are known to occur, contact your Danfoss representative for an evaluation of unit bearing life.
Tapered output shafts or clamp-type couplings are recommended for applications where radial shaft side
loads are present.
Direction of external shaft load
0° Re
Orient radial shaft
load to 90° or 270°
(opposite of
block load)
90° Re
Axis of
swashplate
rotation
180° Re
Shaft loading parameters
R Maximum radial load
e
M Maximum external moment
e
L Distance from mounting flange to point of load
F Force of block
b
T Thrust load
e
Maximum external shaft moments
LPV
M /N•m [in•lbf]
e
e
End view
of shaft
270° Re
P100595
101 [890]
), using the formula below, the maximum
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