Background and overview
JR West developed kiha189 diesel multiple unit in 2010 to displace superannuated
kiha181 series used on "Hamakaze" intercity services linking
Osaka and Tajima province via the Bantan line.
Car body
They have 2950mm wide bodies incorporating light weight stainless construction.
Their body features laser beam welding for the improvement of body strength
and reduction of skin distortion of side construction. In addition, their
cross member of the underframe, side column, and carline are positioned
longitudinally to form ring shape construction for more intense strength
against lateral collision. The bodies are unpainted and have madder red
wide band around side windows and white waistline band running the length
of each car below the windows. Gangwayed cab end section is constructed
by using hot-rolled atmospheric corrosion resisting steels (Steel Marine
Atmospheric) and is swept back to guide another vehicle colliding with
apart for the non-head-on collision accident measure. Two pairs of headlights
employing the sealed beam light bulb are fitted above the windscreens and
horizontally long rectangular shaped LED taillights below the windscreens.
They employ a mounted driver's cab to improve forward visibility. Their
floor level is 1170mm to get rid of the step at the doorway for better
accessibility. Anti-fall plates between vehicles are also introduced excepting
the cab end. They are equipped with a 1000mm wide single leaf sliding door
and wide fixed double-glazing windows aligned two seating bays. A LED destination
display is fitted on each side of the body. Two air conditioners, WAU707A,
rated at 20000kcal/h are fitted on the roof. They employed tight lock couplers
and end vehicles are equipped with the automatic jumper coupler to ease
rush-up operations.
Bogies
The bogies are powered bogiesd, WDT66, which has a driving axle and a driven
axle featuring bolster-less secondary air suspension, axle arm type journal
box supporting system, and a single-link traction gear. Their bogie employing
bow-shaped bogie frame to lower the fitting position of bolster suspension
realizes to lower the floor level. These bogies feature yaw dampers, and
anti-rolling stabilizer to ensure smooth ride characteristics even at 130km/h.
The driving axle employs single tread brake rigging featuring an automatic
slack adjuster and the trailer axle employs both the double disk brake
rigging and the single tread brake rigging.
Traction unit and ancillary equipments
They are powered by two four-cycle straight-six diesel prime movers, SA6D140HE-1,
with a power output of 450PS employing the turbo charger powered by the
flow of exhaust gas, the intercooler, and the common rail direct fuel injection
to reduce exhaust emission, especially NOx, significantly. Their hydraulic
transmission gear classified as DW21B features three-member one-stage torque
converter, multi-plate wet clutch, and four-staged direct coupled range.
A radiator and heat exhaust fan unit are miniaturized to be fitted under
the floor to increase seating capacity. They aim to reduce manufacturing
cost and ease maintenance by standardizing equipments with JR West's EMU
trains in particular the 223 series by employing electrified and standardized
equipments to realize beltless. An engine driven generator, WDM113, is
powered by one of prime movers via a Constant Speed unit supply three-phase
440V to the air conditioner and the electric heating. This 440VAC is also
stepped down to 100VAC or rectified to 100VDC to supply to the control
circuit and the auxiliary equipments. The Kiha189 series are equipped with
two engine driven air compressors, C600, driven by each prime mover with
the belt, because gear driven air compressor employed for kiha126 series
DMU sometimes failed caused by oil rising. Kiha189 series adopt the transmission
control unit, TICS (Train Information Control System), which runs on PLC
(Programmable Logic Controller) to reduce trains lines and relays. The
brake system is changed into the electric command pneumatic brake with
jake braking. If the jake braking is no longer able to provide the specified
braking force, the pneumatic braking supplements it.
Accommodation
Seating accommodation consists of 2+2 abreast adjustable reclining with
970mm seating pitch. An LED display for providing passenger information
is fitted above the door between a vestibule and a passenger saloon. Class
kiha189-0 vehicles are equipped with a universal access toilet employing
a flip-up diaper-changing station and a flip-up highchair, a flushing urinal,
and a washroom. On the other hand, class kiha188 vehicles are equipped
with a western style toilet and a flushing urinal. Each toilet has a vacuum
toilet system. Class kiha189-0 vehicles are also equipped with a multi-purpose
room.
Operations
Kiha189 series entered revenue services in November 2010. They are now used on "Hamakaze" intercity services linking Osaka and Tajima province via the Bantan line. |
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