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Twiflex TLB-180 Turning, Locking, & Braking System for Ice Breaker Propulsion Shaft
A leading global marine propulsion system OEM required a unique drive shaft turning,
locking and braking solution for use on a next-generation ice-breaking vessel.
Controlled locally or from the bridge, the equipment fitted to each of the three propeller
drives rotates and holds the propulsion shaft during maintenance. It also stops and
locks the drive shaft to prevent the propeller from rotating when the vessel is moored
in a flow stream.
To meet the challenging multi-function application requirements, Twiflex engineers
worked closely with the OEM to develop a completely new custom solution. The unique
Twiflex TLB-180 produces a continuous turning torque of 140 kNm at 0.6 rpm in
both directions with a dynamic braking capacity and static locking torque rated up
to 180 kNm.
The system features a 1.5m (4.9 ft.) diameter split disc with a gear tooth profile which
easily mounts onto a flange without the need to disassemble the main propulsion
shaft. A manual lever controls the motor-driven geared pinion, allowing the operator to
slowly rotate the shaft to the desired alignment for maintenance work. Once in position,
the operator can manually hold the shaft in place by energizing the caliper brakes
or by engaging the manual locking device. The new brake design required a custom
hydraulic power pack and control panel.
The system is also used to slowly rotate the shaft occasionally when the vessel is in
port for an extended period of time, keeping the propeller free from marine growth.
- Custom direct hydraulic
applied, spring released
- 140 kNm continuous turning
torque at 0.6 rpm in both
- Braking and static locking
torque rated up to 180 kNm
- Remote or local control
- Custom hydraulic power
pack and control panel