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146366

DC CLUTCHES AND BRAKES

Type DC elements can be used as either pressure actuated clutches or brakes. They are available in single and multiple disc designs.

Pressurizing the cylinder causes the piston to clamp the friction disc assemblies between clamping plates. External springs ensure positive disengagement.

Type DC elements are available in five basic disc sizes with static torque ratings to 2,061,000 lb.in (233.000 N.m). Element sizes are indicated by the number of friction discs and by the disc diameter in inches. For instance, size 225DC has two friction discs 25 inches in diameter.

Specifications

Features

Favorable torque to size ratio.
DC type elements are physically smaller than most other type clutches and brakes with the same torque capacity.
Low inertia friction disc assembly.
Reduces the overall inertia that must be started or stopped.
Optional split friction discs.
Allows removal of friction discs without disturbing other components of drive system in mid-shaft element arrangement.
Long wearing, self lubricating PolyPak* seals.
Eliminates premature twisting failure and requires no external lubrication.

Where Used

Power Presses
Tension BrakesEmergency Stop Brakes on
Unwind Stands

Dimension D1

8.25 in
210 mm

W4

14.63 in
372 mm

Dimension D46

0.00 in
0 mm

Dimension D31

1.50 in
38 mm

Dimension D44

0.38 in
10 mm

Dimension H16

8.50 in
216 mm

H Number

3

H Size

3/8-16NC-2

Bolt Circle

9.13 in
232 mm

Dimension J1

23.250 in
590.6 mm

Dimension J12

18.250 in
463.5 mm

Dimension J23

23.82 in
605 mm

Dimension O2

1/2-14 NPT

Number of Friction Discs

3

Size

320DC

Dynamic Torque Rating at 75 psi (5.2 bar)

231000 lb·in
26080 Nm

Maximum Speed of Disc

1850 rpm

Maximum Speed of Element

850 rpm

Housing (Inertia)

126 lb·ft²
5.31 kg·m²

Disc & Gear (Inertia)

49 lb·ft²
2.06 kg·m²

Disc and Gear (Weight)

213 lb
97 kg

Housing (Weight)

359 lb
163 kg

Gear Part Number

416304

Minimum Bore

4.88 in
124 mm

Maximum Bore

5.56 in
141 mm

Manufacturer

Eaton-Airflex

Actuation

Air (DC)

Notes

Basic part number only. Gear not included.
Some high torque applications of three and four disc elements require additional support on the cylinder side of the unit. Contact your local Airflex representative for more details.

1 Tolerance +0.000/-0.003 in (+0.00/-0.08 mm)
2 Tolerance +0.003/-0.000 in (+0.08/-0.00 mm)
3 Maximum diameter of “as cast” surfaces.