Part Options; Shaft Options; Loop Flushing Valve - Danfoss MP1 Service Manual

Service Manual
MP1 Motor

Part Options

Shaft Options

Loop Flushing Valve

12 | © Danfoss | November 2020
MP1 motors are available with a variety of splined, straight keyed, and tapered shaft ends. Nominal shaft
sizes and torque ratings for some available shafts are shown in the accompanying table. Other shaft
options may exist. Contact your Danfoss representative for availability.
Torque ratings assume no external radial loading.Continuous torque ratings for splined shafts are based
on spline tooth wear, and assume the mating spline has a minimum hardness of R
and coupling has good lubrication.
Maximum torque ratings are based on shaft torsional strength and assume a maximum of 200,000 load
reversals.
Shaft availability and torque ratings
N•m [lbf•in]
Spline, 13 tooth, 16/32 pitch
Spline, 15 tooth, 16/32 pitch
Spline, 17 tooth, 24/48 pitch
Tapered, Ø22.225 mm
Straight keyed, Ø22.225 mm
Recommended mating splines for MP1 motor splined output shafts should be in accordance with ANSI
B92.1 Class 5. Danfoss external splines are modified Class 5 Fillet Root Side Fit. The external spline Major
Diameter and Circular Tooth Thickness dimensions are reduced in order to assure a clearance fit with the
mating spline.
Closed circuit systems may require loop flushing to meet temperature and cleanliness requirements. MP1
motors are available with an optional integral loop flushing. A loop flushing valve will remove heat and
contaminants from the main loop at a rate faster than otherwise possible.
The hydraulic circuit of an MP1 motor with loop flushing option is shown below. The MP1 motor loop
flushing design is a simple spring centered shuttle spool with an orifice notch.
A
B
A loop flush shuttle spool is used to separate system A and system B pressures. System delta pressure will
cause the shuttle spool to shift, allowing the low side system pressure to flow to the orifice towards the
case. The shuttle shifts at approximately 4 bar [57 psi]. The flushing flow is a function of the low loop
system pressure and the size of the notch.
Loop flush flow options of 1.5 & 3.6 l/min [0.4 & 1.0 gal/min] are available and are adequate for most
applications. Contact your Danfoss representative for assistance.
Max
Max
Max
Max
Max
L2 N
Notch
L1
55 to full spline depth
c
20/24
226 [2000]
362 [3200]
165 [1460]
362 [3200]
226 [2000]
Spring guide
Spool
AX323657269473en-000104
Plug
Spring
P400637