Spring-applied actuators serve as "fail-safe elements" of the safety of the vehicle.
Spring-applied actuator HYS 101 installed in the motor bogie of a low-floor vehicle.
Installed spring-applied actuator HYS 35x.
External spring-applied actuator HYS 25x in the trailer bogie of a low-floor vehicle.
Spring-applied actuator HYS 4xx installed in a driverless system.

Spring-applied actuators

Spring-applied actuators provide the "fail-safe elements" of the safety system in tram vehicles; if the energy supply fails, the braking force is provided with the force of a mechanical spring. The brake caliper design is particularly preferred in low-floor vehicles as there is not enough space for solutions with brake riggings. Brake calipers are also lighter and they also have lower working strokes which reduces reaction time and the braking distance, too.

Spring-applied brake calipers can either be mounted on the hollow shaft of the gear box, on single-running wheels or on the fast-running motor shaft. No matter where they are to be mounted, HANNING & KAHL actuators perform with optimum efficiency.

Apart from the basic "Brake/Release" function , most spring-applied actuator types can be equipped with further functions: a second hydraulic release circuit, automatic slack adjuster and a manual auxiliary release possibili.

Technical Data

Type HYS-4xx HYS-35xx HYS-25xx HYS-1xx          
Mounted to/effective as motor shaft (high spedd) axle brake hollow gearbox shaft/axle brake wheel/single wheel brake motor shaft (high speed)/axle brake          
Force range (kn) 14,5 - 35 30 - 50 15 - 30 4 - 10          
Typ caliper caliper caliper caliper          
Force transfer cartridge direct cartridge lever cartridge lever cartridge direct          
Slack adjustment automatic automatic automatic manual/automatic          
Release method hydr. service solution service hydraulic circuit service hydraulic circuit service hydraulic circuitaufend) Achsbremse          
hydr. auxiliary solution aux hydr. circuit aux hydr. circuit aux hydr. circuit aux hydr. circuit        
Application parking brake parking brake parking brake parking brake          
service brake service brake service brake substitution brake          
substitution brake substitution brake substitution brake emergency brake          
emergency brake emergency brake emergency brake            
Brake disk (Ø, Breite) Ø bis 640 mm s bis 00 mm 340 - 440 mm, s bis 60 mm Ø 340 - 440 mm,s 32 - 65 mm Ø 340 - 440 m Ø 300 - 350 s 35 mmmm