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 # 416388  


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Item # 416388, 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
18.00 in
457 mm

W4
25.00 in
635 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
4

Size
438DC

Dynamic Torque Rating at 75 psi (5.2 bar)
2240000 lb·in
252900 Nm

Maximum Speed of Disc
950 rpm

Maximum Speed of Element
450 rpm

Housing (Inertia)
2355 lb·ft²
99.24 kg·m²

Disc & Gear (Inertia)
1112 lb·ft²
46.86 kg·m²

Disc and Gear (Weight)
1424 lb
646 kg

Housing (Weight)
1817 lb
824 kg

Gear Part Number
416461

Minimum Bore
8.50 in
216 mm

Maximum Bore
10.25 in
260 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.