The Rowland Company
4900 North 20th Street
Philadelphia, PA 19144
Toll Free: 800-925-8824   Phone: 215-455-4900    Fax: 215-455-8888
E-Mail: rowland@rowland2.com    Web site: www.rowlandcompany.com
All Categories > Clutches and Brakes > Disc Clutches and Brakes > DC Clutches and Brakes > Item # 146389  


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Item # 146389, 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.





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
12.00 in
305 mm

W4
18.00 in
457 mm

Dimension D46
0.00 in
0 mm

Dimension D31
1.75 in
44 mm

Dimension D44
0.25 in
6 mm

Dimension H16
11.50 in
292 mm

H Number
4

H Size
3/8-16NC-2

Bolt Circle
12.25 in
311 mm

Dimension J1
30.630 in
778.0 mm

Dimension J12
24.375 in
619.1 mm

Dimension J23
30.58 in
777 mm

Dimension O2
1/2-14 NPT

Number of Friction Discs
4

Size
425DC

Dynamic Torque Rating at 75 psi (5.2 bar)
640000 lb·in
72260 Nm

Maximum Speed of Disc
1400 rpm

Maximum Speed of Element
650 rpm

Housing (Inertia)
582 lb·ft²
24.53 kg·m²

Disc & Gear (Inertia)
186 lb·ft²
7.84 kg·m²

Disc and Gear (Weight)
533 lb
242 kg

Housing (Weight)
953 lb
432 kg

Gear Part Number
416477

Minimum Bore
6.25 in
159 mm

Maximum Bore
6.88 in
175 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.