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146336

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

9.000 in
229 mm

W4

16.50 in
419 mm

Dimension D46

0.00 in
0 mm

Dimension D31

2.45 in
62 mm

Dimension D44

0.25 in
6 mm

Dimension H16

16.50 in
419 mm

H Number

4

H Size

1/2-13NC-2

Bolt Circle

17.50 in
445 mm

Dimension J1

44.750 in
1136.7 mm

Dimension J12

36.375 in
923.9 mm

Dimension J23

44.86 in
1139 mm

Dimension O2

3/4-14 NPT

Number of Friction Discs

2

Size

238DC

Dynamic Torque Rating at 75 psi (5.2 bar)

1120000 lb·in
126450 Nm

Maximum Speed of Disc

950 rpm

Maximum Speed of Element

450 rpm

Housing (Inertia)

2139 lb·ft²
90.14 kg·m²

Disc & Gear (Inertia)

562 lb·ft²
23.68 kg·m²

Disc and Gear (Weight)

750 lb
340 kg

Housing (Weight)

1651 lb
749 kg

Gear Part Number

416069

Minimum Bore

8.50 in
216 mm

Maximum Bore

10.25 in
260 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.