We put the same level of attention to detail into each of our brake systems as every other component designed and built by Zenar Corporation. We want every customer to receive a complete solution of exceptional quality, no matter the application.

Shown below are our disc brakes (DB) and shoe brakes (ESB). Zenar Corporation keeps most parts for these brakes stocked, allowing us to provide complete assemblies on a quick turnaround basis. Zenar Corporation still makes these types of brakes, but now uses thruster type brakes as our standard. DB0 and DB1 brakes are made strictly for only replacing parts on existing cranes. Pricing is available upon request.

 

Brake Model Torque Rating
DB0 up to 5 ft-lbs (Replacement Part)
DB1 up to 10 ft-lbs (Replacement Part)
DB2 up to 25.2 ft-lbs
DB3 up to 50.5 ft-lbs
DB4 up to 53 ft-lbs
DB5 up to 106 ft-lbs
DB6 and up Call Us!
ESB8 up to 100 ft-lbs
ESB10 up to 200 ft-lbs
ESB13 up to 550 ft-lbs
ESB16 up to 1,000 ft-lbs
ESB19 up to 2,000 ft-lbs

Thruster Brakes for Overhead Traveling Cranes

  • Spring applied and electrically released.
  • Has Class F insulation.
  • Eliminates time required to manually adjust for linkages for brake shoe lining wear by automatically compensating for lining wear.
  • Auto equalizes and maintains running shoe clearance and maintains proper running, allowing balanced braking and equal brake pad wear.
  • Fast response for heavy duty cycles.
  • Continuously rate service for less than 40 degree C ambient.
  • Adjusted externally for stepless time delays in both directions.
  • External torque spring with calibrated indicator.
  • Stainless steel pivot pins are available.
Thruster Brake

Type ‘DB’ magnet operated D.C. brakes

  • Simple mechanical design for safe, dependable operation.
  • Fully enclosed and protected against unfavorable weather conditions or detrimental operating environments.
  • DC actuated; solid state AC rectifier available for AC application.
  • Short stroke and fast action without hammering or vibration for long brake life.
  • Beefed up braking faces for cooler operation and prolonged lining life.
  • Epoxy potted and encapsulated magnet coil with copper magnet wire, Class F insulation, 75 degree “C” rated at 40 degree “C” ambient.
  • Mechanical cooling not needed even in high duty cycle applications.
  • Adjustable torque feature available for bridge and trolley drives.
  • Improved inspection cover design for easy removal and access to all parts.
DB Disc Brake

Proven to be the most effective, trouble-free design available, “Type DB” AC rectified DC motor brakes are ideal for overhead cranes on hoist, bridge, and trolley drives. The direct acting positive braking features mean remarkable performance, unmatched simplicity and durability. The DB disc brakes’ highly rapid setting time results in fast, positive stops at the very moment when power is removed. Upon power restoration, a fleeting delay in brake release causes the motor to drive momentarily through a partly released brake. This more deliberate acceleration sets up softer, smoother starts that improve inching and spotting effectiveness.

A low braking pressure reduces thermal wear, enhances lining life, and excludes any need for mechanical cooling. Reduced armature stroke, simple mechanical structure, and a stationary electromagnet eliminate the hammering action and vibration that often shorten brake life. The DB’s exceptional design requires the least possible maintenance and makes the brake virtually self-adjusting.

Technical Data / Instruction Information

Models File Download
DB0 / DB2 / DB4 CMDBII-01 05-08
DB1 / DB3 / DB5 / DB6/ DB7 CMDBII-02 05-08
DB8 CMDBII-03 05-08
DB9 CMDBII-04 05-08

Type “ESB” (AIST – NEMA) magnet operated D.C. shoe brakes

  • The best choice for normal, heavy, and severe duty crane service.
  • Spring set and electrically released.
  • Standard 8″, 10″, 13″, and 16″ sizes.
  • DC actuated; solid state AC rectifier provided for AC crane application.
  • Adjustable brake torque to a minimum 25% of rated torque.
  • Epoxy potted encapsulated magnet coil with copper magnet wire, Class “F” insulation rated 75 “C” at 40 degree “C” ambient.
  • Automatic brake shoe centering and alignment to the brake wheel.
  • Bonded non-asbestos linings for long shoe life.
  • Simple shoe replacement, removable from either brake side.
  • Program available for relining used brake shoes at the factory.
  • Pivot pins all steel, hardened and interchangeable for each brake size.
  • Conveniently positioned adjustment points located on top of brake.
  • Top-hinged armature design to prevent accumulating foreign matter.
  • Ductile iron brake wheels available semi finished (maximum offset and rough bored) as standard, or finished machined as special.
ESB Shoe Brake

Type “ESB” D.C. electric shoe brakes are highly regarded as the safest, most effective brake concept for normal, heavy, and severe duty crane service. The direct acting positive braking features mean remarkable performance, unmatched simplicity, and durability. An exceptionally rapid setting time results in fast, certain stops at the instant power is removed.

The “ESB” brake’s ultra smooth operation is a direct result of a reduced armature stroke (air gap), simple mechanical structure, and a stationary magnetic brake coil. Eliminated are the hammering action and vibration that often shorten brake life. This exceptional design achieves maximum effectiveness while requiring a minimum of maintenance.

A forced voltage AC to DC rectifier provides 250% power to the magnet coil to initiate the brake release. Upon brake release, the power reduces to 25%. This forced voltage design provides quicker release and setting times for the brake.

Technical Data / Instruction Information

Models File Download
ESB8 / ESB10 / ESB13 / ESB16 / ESB19 CMESB 01-04

 

To learn more about the brakes designed and fabricated here at Zenar Corporation, please contact us.