FLEXX* Curve is an enhanced HALL®, resulting from a collaboration between BOMBARDIER and Trelleborg. FLEXX Curve with frequency-depending longitudinal stiffness, like the HALL®, has following advantages over conventional axle guide bushings:
Reduced curve squeal noise
Reduced wheel and track wear
Reduced energy consumption
Reduced track access charges.
In addition to the HALL® functionalities, FLEXX Curve is able to:
Adapt small curves better than HALL® (higher longitudinal deflection capacity)
Allows easy hydraulic cross connection to maintain curving performance, under high traction and braking forces
Be loaded with high vertical forces, based on its innovative design
Be installed as plug-and-play solution, for BOMBARDIER* TALENT* 2 and 3, BOMBARDIER* TWINDEXX* and upcoming BOMBARDIER* FLEXX* Compact bogies.
Traction and braking forces are mechanically compensated
Cx stat.= 3 kN/mm (trailer bogie)
Cx stat.= 5 kN/mm (motor bogie)
Cross Coupled
Connected FLEXX Curve units from left to right bogie side
Traction and braking forces are hydraulically compensated
Cx stat. = 2 kN/mm (all bogies)
Cross Coupled/PRS
Cross coupled design
Outstanding curving performance by valve-controlled fluid flow
Cx stat. < 2 kN/mm (all bogies)
FLEXX® Curve characteristics
Design space
Stiffness
Longitudinal Stiffness CX
Why a hydraulic axle guide element?
The conflict of aims between a good curving behavior and stable running at high speed can be solved by conventional parts only in form of a compromise. HALL® bush has the ideal characteristic for good curving behavior and stable running at high speed.
FLEXX® Compact Bogie
Building Block Primary Suspension Design Types
«Conventional» Cx=25kN/mm
FLEXX Curve «Standard» Cx = 3-5kN/mm
FLEXX Curve «Cross-Coupled»Cx = 2kN/mm
FLEXX Curve «Cross-Coupled / PRS»Cx < 2kN/mm
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