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1.5.4 Adjust the Air Gap of the Brake1.5.4 Adjust the Air Gap of the Brake
Rated air gap Z grows with the friction. In order to there is sufficient braking torque, the air gapRated air gap Z grows with the friction. In order to there is sufficient braking torque, the air gap
must be set before it reaches to the maximum value. The air gap can be adjusted by severalmust be set before it reaches to the maximum value. The air gap can be adjusted by several
times. When the thickness of brake pad becomes the minimum value(see the specification tabletimes. When the thickness of brake pad becomes the minimum value(see the specification table
below), the brake pad must be replaced.below), the brake pad must be replaced.
Once the air gap reaches the top value, the brake might not be released and the brake padOnce the air gap reaches the top value, the brake might not be released and the brake pad
would be burn out. It will also cause the decrease of braking force and the retention and thewould be burn out. It will also cause the decrease of braking force and the retention and the
noise increase and even big accidents. It is prominent to do the periodical inspection and adjustnoise increase and even big accidents. It is prominent to do the periodical inspection and adjust
the air gap. Disconnect the power. Through adjusting 3 hollow bolts (8) and the mounting bolts ofthe air gap. Disconnect the power. Through adjusting 3 hollow bolts (8) and the mounting bolts of
stator (9), set the air gap between stator (1) and armature (2) to the rated Z by a feelerstator (9), set the air gap between stator (1) and armature (2) to the rated Z by a feeler
gauge.Ensure air gap at all directions are same.gauge.Ensure air gap at all directions are same.
Specification Specification TTableable
RatedRated
TorqueTorque
RatedRated
PowerPower
Rated AirRated Air
GapGap
MaximumMaximum
Air GapAir Gap
MinimumMinimum
Thickness of RotorThickness of Rotor
Pre-tension Torque ofPre-tension Torque of
the Mounting Boltthe Mounting Bolt
8 8 N.m N.m 25 25 WW 0.2mm
0.2mm 0.5 0.5 mm mm 6.4 6.4 mm mm 5.5 5.5 N.mN.m
On the condition of power disconnected, through adjusting 3 mounting bolts of brake (1) and theOn the condition of power disconnected, through adjusting 3 mounting bolts of brake (1) and the
hollow bolts (7), set the air gap between stator (11) and armature (8) to the rated Z by a feelerhollow bolts (7), set the air gap between stator (11) and armature (8) to the rated Z by a feeler
gauge. Ensure air gap at all directions are same.gauge. Ensure air gap at all directions are same.
Set the air gap Set the air gap in the following sequence:in the following sequence:
–– Unscrew the mounting bolts of brake (1) with a Unscrew the mounting bolts of brake (1) with a hex wrench.hex wrench.
–– Adjust the hoAdjust the hollow bolts (7llow bolts (7) with a span) with a spannerner..
––
Screw up the three mounting bolts of brake (1).Screw up the three mounting bolts of brake (1).
–– Check if the air Check if the air gap Z is gap Z is within the standard range with a feeler gauge.within the standard range with a feeler gauge.
–– Adjust Adjust the the mounting mounting bolts bolts and and hollow hollow bolts bolts respectively according respectively according to to the the following following figures.figures.
Set the air gap Set the air gap and screw up the mounting bolts of and screw up the mounting bolts of brake.brake.
11
77
ZZ
++
--
Under the general operating conditions, the first set of the air gap is usually after 1500 to 2000Under the general operating conditions, the first set of the air gap is usually after 1500 to 2000
hours service of the brake and it is suggested to adjust the air gap every 6 months. If it comes tohours service of the brake and it is suggested to adjust the air gap every 6 months. If it comes to
a poor working condition, such as frequent use of brake and repeated emergency stopsa poor working condition, such as frequent use of brake and repeated emergency stops
，，
the airthe air
gap should be set when the gap should be set when the brake the shorten the adjustment interval for the first brake the shorten the adjustment interval for the first time.time.
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