Rear Drive Axles (RDA or BRA)

  • BRIST Rear Drive Axles are categorised under 3 main sub-categories as “Z-Drive Axle“, “Hypoid 90 Drive Axle” and “Inverted Portal Axle” types
  • All types of BRIST RDA has proven their performance with their track record in reputable OEMs across the globe (e.g. BYD, BMC, Isuzu, SamAuto and many more)

Rear Drive Axles– Z Drive Axle

  • BRIST Z Drive is a unique configuration specifically developed for buses with the engine in transversal layout
  • It brings optimised seat configuration and optimised weight for the bus, since it shortens the rear overhang
  • This axle is supplied with its Angle Drive Unit at the same input flange angle (35°)
  • With BRIST Z Drive Axle, Isuzu Novo Citi Life broke the export record of Turkey in midi-bus segment with annual exports of 16.9 million Euro
TypeAxle Load Max
(kgf)
Wheel Travel
(mm)
Axle Gear RatioDiff. Offset*Tire Size MaxSuspension TypeAxle Weight
(w/o Oil)
Wheel Size
(mm)
Rear Z Drive AxleRDA 65-175/A356,500± 854.45:173245/75 R17.5″Air/leaf spring suspension
2 bellows
412 kg
as bare
17.5×6.75
Bolt Circle 205
BRIST Z Drive AxleRDA 65-175/A356,500± 854.45:1192245/75 R17.5″Air suspension
4 bellows
469 kg as bare
600 kg as fully dressed
17.5×6.75
Bolt Circle 205
Rear Z Drive AxleRDA 65-195/A356,500± 854.45:1
3.81:1
192225/70 R19.5″Air suspension
4 bellows
469 kg as bare
600 kg as fully dressed
19.5×6.75
Bolt Circle 275
RDA 65-175/A35BRIST Z Drive Axle
Axle Load Max6,500 kgf
Wheel Travel± 85 mm
Axle Gear Ratio4.45:1
Diff. Offset73 mm outboarded to RH side
Tire Size Max245/75 R17.5″
Suspension TypeAir/leaf spring suspension 2 bellows
Axle Weight (w/o Oil)412 kg as bare
Wheel Size17.5″x6.75″
Bolt Circle 205 mm
RDA 65-175/A35BRIST Z Drive Axle
Axle Load Max6,500 kgf
Wheel Travel± 85 mm
Axle Gear Ratio4.45:1
Diff. Offset192 mm outboarded to RH side
Tire Size Max245/75 R17.5″
Suspension TypeAir suspension 4 bellows
Axle Weight (w/o Oil)469 kg as bare 600 kg as fully dressed
Wheel Size17.5″x6.75″
Bolt Circle 205 mm
RDA 65-195/A35Rear Z Drive Axle
Axle Load Max6,500 kgf
Wheel Travel± 85 mm
Axle Gear Ratio4.45:1
3.85:1
Diff. Offset192 mm outboarded to RH side
Tire Size Max225/70 R19.5″
Suspension TypeAir suspension 4 bellows
Axle Weight (w/o Oil)469 kg as bare 600 kg as fully dressed
Wheel Size19.5″x6.75″
Bolt Circle 275 mm
  • Specifications of the Angle Drive unit at 35° input flange angle are shown at the table below
TypeMax Engine Power
(kW)
Max Input Speed
(rpm)
Max Input Torque
(Nm)
Gear RatioWeight w/o Oil
(kg)
Oil Capacity
(l)
Angle Drive UnitADU 65/A351504,5004,5900.967:1643.0
ADU 65/A35Angle Drive Unit
Max Engine Power150 kW
Max Input Speed4,500 rpm
Max Input Torque4,590 Nm
Gear Ratio0.967:1
Weight w/o Oil64 kg
Oil Capacity3.0 l

Rear Drive Axles– Hypoid 90° Drive Axle

  • BRIST RDA Hypoid 90° Drive Axles are applicable for buses with either rear or front engine options
  • Optionally, they are supplied as fully dressed with suspension (half leaf-spring integrated with single air-spring)
TypeAxle Load Max
(kgf)
Output Torque
Max
(Nm)
Tilting AngleDiff. Input
Angle
Axle Gear
Ratio
Axle Weight
w/o Oil
(kg)
Tire Size MaxWheel Size
(mm)
Rear Drive AxleRDA 65-175/A906,5503.5°90°5.29:1711215/75 R17.5″ twin17.5×6.00″
Bolt circle 205
Rear Drive AxleRDA 65-175/A906,55090°4.56:1678205/75 R17.5″ twin17.5×6.00″(offset)
Bolt circle 245
RDA 65-175/A90Rear Drive Axle
Axle Load Max6,550 kgf
Output torque Max
Tilting Angle3.5°
Diff. Input Angle90°
Axle Gear Ratio5.29:1
Axle Weight (w/o Oil)711 kg
Tire Size Max215/75 R17.5″ twin
Wheel Size17.5×6.00″ Bolt circle 205 mm
RDA 175/A90Rear Drive Axle
Axle Load Max6,550 kgf
Output torque Max
Tilting Angle
Diff. Input Angle90°
Axle Gear Ratio4.56:1
Axle Weight (w/o Oil)678 kg
Tire Size Max205/75 R17.5″ twin
Wheel Size17.5×6.00″(offset)
Bolt circle 245 mm
*outboarded to RH side

Rear Drive Axles Inverted Portal Axle (BRA)

  • BRIST engineered Inverted Portal Axle (BRA) specifically for mid-size LF buses
  • It offers max corridor width, higher ground clearance provided with radial brakes, compact dimension in height and less system weight with 10.4t loading capacity
  • BRIST Inverted Portal Axle is available at 75°, 80° and 90° input shaft angle
  • BRIST Inverted Portal Axle supported BMC to receive Busworld Best Design Label with Neocity Bus Family
TypeAxle Load Max
(kgf)
Output Torque
Max
(Nm)
Tilting AngleDiff. Input
Angle
Axle Gear
Ratio
Axle Weight
w/o Oil
(kg)
Tire Size MaxWheel Size
(mm)
Inverted Portal AxleBRA104-195 DC/A7510,40035,00075°4.86:1711265/70 R19.5″ twin19.5″x7.5″
Bolt Circle 275
Inverted Portal AxleBRA104-195 DC/A8010,40035,00080°4.86:1711265/70 R19.5″ twin19.5″x7.5″
Bolt Circle 275
Inverted Portal AxleBRA104-195 DC/A9010,40035,00090°5.87:1711265/70 R19.5″ twin19.5″x7.5″
Bolt Circle 275
BRA104-195 DC/A75Inverted Portal Axle
Axle Load Max10,400 kgf
Output torque Max35,000 Nm
Tilting Angle
Diff. Input Angle75°
Axle Gear Ratio4.86:1
Axle Weight (w/o Oil)711 kg
Tire Size Max265/70 R19.5″ twin
Wheel Size19.5″x7.5″
Bolt Circle 275 mm
BRA 104-195 DC/A80Inverted Portal Axle
Axle Load Max10,400 kgf
Output torque Max35,000 Nm
Tilting Angle
Diff. Input Angle80°
Axle Gear Ratio4.86:1
Axle Weight (w/o Oil)711 kg
Tire Size Max265/70 R19.5″ twin
Wheel Size19.5″x7.5″
Bolt Circle 275 mm
BRA104-195 DC/A90Inverted Portal Axle
Axle Load Max10,400 kgf
Output torque Max35,000 Nm
Tilting Angle
Diff. Input Angle90°
Axle Gear Ratio5.87:1
Axle Weight (w/o Oil)711 kg
Tire Size Max265/70 R19.5″ twin
Wheel Size19.5″x7.5″
Bolt Circle 275 mm