MARINE DISC BRAKES
FOR MAIN PROPULSION SHAFTS AND BOW THRUSTERS THE MODERN, EFFICIENT AND RELIABLE METHOD OF STOPPING AND HOLDING

TWIFLEX DISC BRAKES . . .

• FEATURES -- Twiflex disc brakes are designed for heavy duty use, easy installation and long, trouble-free service. They feature quick change non asbestos brake pads, fast response time and no maximum disc diameter limitation for the calipers.

• DESCRIPTION -- Twiflex spot type disc brakes consist of a disc fitted to a rotation shaft and a caliper which clamps friction pads to the disc on signal to stop the disc when required. Stopping is the basic function of the disc brake although holding is also provided. The calipers are operated either pneumatically or hydraulically and are actuated by signal from users pneumatic brake control panel, or from a Twiflex controller.

• TYPES OF CALIPERS -- Twiflex Calipers are pneumatic or hydraulic applied with spring retraction. Pneumatic and hydraulic requirements must be determined and are the repsonsibility of the user. Spring applied - pneumatic or hydraulic release calipers are also available for winch, hoist or windlass brake applications.

  Pneumatic Calipers				Hydraulic Calipers
  	MX25B MODEL GMRP MODEL				MX25B MODEL GMRP MODEL

• OPERATION -- Typical operation sequences of a Twiflex disc brake system installed on a reversing engine driving propeller thru a reversing gearbox are as follows:
  1. Throttle control lever is moved to neutral.
  2. Clutch disengages.
  3. Disc brake stops propeller.
  4. Engine rotation is reversed.
  5. Throttle control lever is advanced.
  6. Disc brake releases.
  7. Clutch engages.

• BRAKE CONTROL PANEL -- A commercially available pneumatic brake control panel supplied by user must be used to correctly phase the operation of the disc brakes and engine clutch. For propulsion systems which do not have brake control panels a Twiflex type SE or SJ controller is available.

• AIR/HYDRAULIC PRESSURE INTENSIFIERS -- For hydraulic applied calipers, Twiflex fast action intensifiers are used in the absence of user's own hydraulic power supply and produce the high pressure required for hydraulic calipers using an available supply of ships compressed air. Twiflex 20:1 air/hydraulic pressure intensifiers are recommended to operate Model T40 hydraulic calipers (one intensifier operates two calipers). Twiflex 20:1 air/hydraulic power pack is recommended to operate four type VCH hydraulic calipers. The 20:1 power pack is a double action, free piston air driven hydraulic pump of exceptional simplicity and durability which includes a sealed reservoir.

• BRAKE DISCS -- Twiflex standard brake discs are manufactured in type 60-45-10 ductile iron or in AISI 1045 steel construction and are available in a wide range of diameters. Forged, wrought (but not cast) or flame cut steel having a Brinell hardness of 200 or more may be used. The disc can be attached directly to the shaft coupling for convenience or ductile iron disc hubs are available for shaft mounting of the discs. It is essential that the disc mounting bolts are a clearance fit of .003" per inch of bolt circle diameter to allow for differential temperature expansion of the disc. Discs for all calipers listed on this site should be 1" thick.

• CALIPER BRACKETS -- Welded steel caliper mounting brackets are usually provided by user since they must meet specific or restricted space requirements. Brackets can be bolted to spacer plates fitted on the gearbox foundation rails. Standard single mounting brackets are available for Model MX25B, GMRP and T40 calipers. Brackets for Model VCH calipers and tandem brackets can be supplied.
  

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