Shaft availability and torque ratings
Alignment between the mating spline’s Pitch Diameters is another critical feature in determining the
operating life of a splined drive connection. Plug-in, or rigid spline drive installations can impose severe
radial loads on the shafts.
The radial load is a function of the transmitted torque and shaft eccentricity. Increased spline clearance
will not totally alleviate this condition; BUT, increased spline clearance will prevent mechanical
interference due to misalignment or radial eccentricity between the pitch diameters of the mating
splines. Spline life can be maximized if an intermediate coupling is introduced between the bearing
supported splined shafts.
Multiple pump installations must consider the loads from the entire pump stack and all torques are
additive. Charge pumps loads must also be included.
Through torque diagram
2. stage 1. stage
3. stage
P003 333E
M
e1
for the second pump
M
e3
for the next pump
M
e1
for the first pump
M
e
input torque
CAUTION
Ensure requirements do not exceed shaft torque ratings. Torque required by auxiliary pumps is additive.
Rated and maximum torque ratings for each available shaft is shown in the H1 size specific technical
information.
Basic Information
H1 Axial Piston Pumps, Single and Tandem
System design parameters
©
Danfoss | April 2017 11062168 | BC00000057en-US0602 | 35
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