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Item # 146390, DC Clutches and Brakes


Image 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.



Unit of Measure: Imperial Metric Both

Features  · Where Used  · Specifications  · Note

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 Brakes
  • Emergency Stop Brakes on Unwind Stands


Specifications

Dimension D1
12.50 in
277 mm

W4
16.25 in
413 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
4

Size
420DC

Dynamic Torque Rating at 75 psi (5.2 bar)
308000 lb·in
34770 Nm

Maximum Speed of Disc
1850 rpm

Maximum Speed of Element
850 rpm

Housing (Inertia)
148 lb·ft²
6.24 kg·m²

Disc & Gear (Inertia)
66 lb·ft²
2.76 kg·m²

Disc and Gear (Weight)
281 lb
127 kg

Housing (Weight)
421 lb
191 kg

Gear Part Number
416472

Minimum Bore
5.38 in
137 mm

Maximum Bore
5.69 in
145 mm

Manufacturer
Eaton-Airflex

Actuation
Air (DC)
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.


Note
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.


 MORE IMAGES 

·  Type DC Brake Elements Brake Drawing

·  Type DC Brake Elements Mounting Circles

·  Type DC Brake Elements Single/Double Disc


 DOWNLOADS 

DC Element Components
(PDF, 74KB)


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