Direct Spring 'DS' Acting Disc Brake
Applications: All
Direct Acting Spring Disc Brakes are used for hoist and conveyor systems, with example installations including opposing-piston floating assemblies for whip hoists, direct-acting free-floating spring/base assemblies for portal crane hoists, and base-style units for mine hoist applications.
Features:
- Spring set, hydraulic pressure release
- Self-contained removable actuators
- Many spring stack options
- Stroke / wear adjustment
- Spring caging feature
- Hydraulic pressure isolated from disc
- Actuator manual release / retraction
- Fixed assemblies with opposing actuators
- Floating assemblies with low friction float bearings
- Floating assemblies with single or opposing actuators
- Narrow profile with actuators on one side
- Single and multiple actuator assemblies
- Optional bases for fixed and floating assemblies
- Optional release and wear proximity switches
- Flow-through actuators for better oil filtering
Brake Selection: The brake size must be chosen to give the required braking torque and to dissipate the energy during stopping without overheating the disc. Brake torque is often related to drive motor torque by an arbitrary service factor, typically 75–100% full load torque for crane travel and similar inertial loads which tend to be self-stopping, or 150–200% for crane hoists and other overhauling loads. If a precise stop time or distance is specified, the brake torque must be calculated.
DS10
Clamping Force: 12,030–140,000 lb / 53,500–623,000 N across the DS10 range
Min Disc Diameter: 30–48 in / 762–1,220 mm (by variant: -08 30″, -09 35″, -10 40″, -12 48″)
Weight (incl. mounting base): 955–2,000 lb / 434–910 kg (base style B lightest, C heaviest)
Total Pad Area: 132–300 in² / 852–1,935 cm²
Actuators: 1 actuator; release volume 2.3–5.3 cu.in / 38–87 cc @ 0.1″ (2.5 mm) air gap
Actuator Pressures: Release 350–2,140 psi / 24.1–147.3 bar; hold-off 320–1,990 psi / 22.1–137.2 bar
Full dimensional drawings available on request.
DS20
Clamping Force: 24,060–280,000 lb / 107,000–1,245,600 N across the DS20 range
Min Disc Diameter: 40–65 in / 1,016–1,650 mm (max 120–160 in / 3,048–4,065 mm)
Weight (incl. mounting base): 2,990–3,875 lb / 1,360–1,760 kg
Total Pad Area: 254–550 in² / 1,635–3,550 cm²
Actuators: 2 actuators; release volume 5.8–10 cu.in / 95–164 cc @ 0.1″ (2.5 mm) air gap
Actuator Pressures: Release 350–2,140 psi / 24.1–147.3 bar; hold-off 320–1,990 psi / 22.1–137.2 bar
Configuration: Available with or without mounting base — contact us to discuss tailored setups.
Full dimensional drawings available on request.
DS30
Clamping Force: 250,900 lb / 1,116,100 N @ 0.1″ (2.5 mm) air gap
Min Disc Diameter: 70 in / 1,778 mm (max 120 in / 3,048 mm)
Weight (incl. mounting base): Base A 3,125 lb / 1,420 kg; Base B 2,830 lb / 1,285 kg; Base C 3,240 lb / 1,472 kg
Total Pad Area: 470 in² / 3,032 cm²
Actuators: 3 actuators; total release volume 9.5 cu.in / 156 cc
Actuator Pressures: Release 1,989 psi / 137.1 bar; hold-off 1,830 psi / 126.2 bar
Full dimensional drawings available on request.
Clamping Force: 420,000 lb / 1,869,000 N @ 0.1″ (2.5 mm) air gap
Min Disc Diameter: 80 in / 2,032 mm (max 200 in / 5,080 mm)
Weight (incl. mounting base): Base A 6,400 lb / 2,912 kg; Base B 5,830 lb / 2,650 kg; Base C 6,500 lb / 2,980 kg
Total Pad Area: 800 in² / 5,160 cm²
Actuators: 3 actuators; total release volume 15 cu.in / 246 cc
Actuator Pressures: Release 2,140 psi / 147.3 bar; hold-off 1,990 psi / 137.2 bar
Full dimensional drawings available on request.