Mounting - Danfoss Airflex DBBS Installation, Operation And Maintenance Manual

DBBS Brakes
TABLE 2
Alignment Requirements
Concentricity
(Parallel, TIR)
of Shaft and
Element
Size (Inches (mm))
20DBBS 0.010 (0,25)
25DBBS 0.010 (0,25)
38DBBS 0.010 (0,25)
50DBBS 0.010 (0,25)
*Perpendicularity measured near the O.D. of the mounting flange.
2.1.2 To aid in obtaining accurate readings, a rigid bracket
should be fabricated for mounting a dial indicator
when checking alignment.
2.1.3 Bearing or machinery manufacturers may require
di erent alignment tolerances. Use the tightest of
those recommended.
2.2

Mounting

Warning
Support brackets for external stud support may be
required for specific brake models. See Table 3 for
models requiring support brackets. Consult Danfoss
Airflex Engineering for design parameters.
Warning
Failure to properly support studs as noted in Table
3 may result in drastic loss of torque, brake damage
and brake failure.
TABLE 3
Brake Sizes Requiring Rigid Support Bracket *
No. of Discs 20DBBS
3
4 x
* Customer must provide a RIGID support on the cylinder end of the brake. Consult Danfoss Airflex
Engineering for design parameters.
2.2.1 Ensure that the shaft is clean and free of nicks or
burrs and that the key fits properly in the shaft and
gear. Tap the key into the shaft keyway.
2.2.2 On multiple disc brakes, before installing the gear
onto the shaft, slide it into the brake assembly to
align the splines on the discs. Air pressure must
Perpendicularly
(Angular, TIR) of
Mounting Flange
to shaft*
(Inches (mm))
0.010 (0,25)
0.012 (0,30)
0.019 (0,48)
0.025 (0,64)
25DBBS 38DBBS 50DBBS
x
x x x
be applied to the brake to release the discs for
alignment. Once the gear passes through all discs,
exhaust the air to clamp them into position and
remove the gear.
Warning
Maximum allowable air pressure is 120 psig (8.2 bar)
for sizes 20DBBS, 25DBBS and 38DBBS. Maximum
allowable air pressure is 150 psig (10.3 bar) for
the 50DBBS. Application of pressure exceeding
maximum allowable may result in damage to the
brake.
CORRECT
2.2.3 Apply a light coat of anti-seizing compound to the
shaft.
2.2.4 To install the gear, heat uniformly to approximately
250°F (121°C), prior to pressing the gear onto the
shaft. Making sure the dimension between the gear
and brake mounting surface ("A") is held at 1.00"
(25.4) for sizes 20DBBS, 25DBBS and 38DBBS and
2.00" for size 50DBBS. See Figure 1.
Caution
Do not allow the gear temperature to exceed 350°F
(176°C). Overheating the gear will adversely a ect
the hardness and wear life.
2.2.5 Apply a light coat of Castrol Molub-Alloy 936SF
Heavy grease or equivalent to the gear teeth and
slide the brake assembly onto the gear.
Note
For reference, Danfoss Airflex part number for the
specified grease is 000153X1182.
Airflex DBB 8110 Brake Assembly E-CLCL-TT001-E
®
INCORRECT
Figure 2
December 2012 7