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energy absorption
The sliding friction buffer stop is designed to dissipate the impact energy in a controlled manner via the sliding action of the friction shoes fitted between the frame and rail profile. This can be used in conjunction with Oleo hydraulic energy absorption systems to provide a recoverable stroke for impacts up to 25 km/h and controlled sliding distances for high speeds
Typically used on metro lines – designed for center impact only. Sliding friction buffer stop [twenty friction shoes] incorporating an Oleo hydraulic unit [one Type 9 - Recoverable stroke 400mm] Train mass: 220 tonnes, Impacting speed: 25 km/h, Installation length: 16 meters, Impact capacity: 224kJ.
Typically used on European main lines (freight) - designed for side impact only. Sliding friction buffer stop [eight friction shoes] incorporating Oleo hydraulic units [two Type 9 - Recoverable stroke 400mm] Train mass: 220 tonnes, Impacting speed: 25 km/h, Installation length: 25 meters, Impact capacity: 448 kJ
Typically used for main lines - designed for center impact only. Sliding friction buffer stop with nine pairs of friction shoes and one pair of anti climber shoes at the front. Incorporating Oleo hydraulic units [two Type 9 - Recoverable stroke 400mm] Train mass: 535 tonnes, Impacting speed: 25 km/h, Installation length: 16 meters, Impact capacity:448kJ.
Detail of friction shoes & anti-climber assembly
The friction shoes being located within fabricated 'pockets' to the arrestor main frame are fitted around the rail profile and secured with three fixings torque to pre-defined settings to achieve the correct retardation value in relation to the design calculations.
Each pair of friction shoes can achieve up to 50kN of braking force, the amount of impact energy to be dissipated will determine the number to be used.
Secondary friction shoes positioned behind the main unit can also be utilised to assist in dissipating the impact energy.
Anti climber shoe assemblies are also fitted to the front of the buffer stops frame and clamped around the rail profile to prevent “uplift” in impact.
The friction shoes and anti climber shoe assemblies are suited to most types of rail profile and can be reused after an impact subject to inspection.