FLEXX Curve
Less is more
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.
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FLEXX® Curve types
Standard
- Plug-and-play solution
- 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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