LIEBHERR MINING EQUIPMENT CO.
4100 Chestnut Avenue
Newport News, Virginia 23605-0200
Ph: (757) 245-5251 - Fax: (757) 928-8755
PRESS RELEASE OCTOBER 16TH 1998
LIEBHERR T282 DESIGN AND DEVELOPMENT
Once again, Liebherr Mining Equipment Co. is in first place as the first OEM to provide the Mining Industry with a two axle, diesel electric, AC drive haul truck with a payload capacity of 360 tons/327 metric tons. This is the haul truck that the industry has been waiting to receive. Not only does the T282 have an increase in payload capacity, but the AC Drive system has been designed to allow for easy configuration as a trolley system with minimal additional equipment required bringing new economics to trolley operation.The T282 360 ton/327 metric ton hauler will provide fuel savings, reduce maintenance requirements, reduce downtime, and maintenance costs providing the mine owner with beneficial increases in productivity.Basic dimensions and weight of the T282 are:
Electric Drive System Siemens/Liebherr
Development of the T282 Liebherr, fueled by an aggressive development posture, began to pursue the over 300 ton diesel electric truck program as the availability of components and the need within the industry became apparent. Liebherr realized that to be successful in this development effort, there has to be the proper match of components, such as:Reliable, efficient (high life/weight) structural package High speed dependable diesel engine Drive system with reduced maintenance requirements and increased operating efficiencies Trolley adaptability Tires, capable of handling increased payload and transportable Lower overall maintenance and operating costsThe design and development program for the T282 was approached from the standpoint of utilization of existing proven concepts to create a new product, not stretching an existing product to meet the market need. In addition, the design criteria for the T282 included the requirement that the hauler envelope and handling performance be consistent with existing and planned mine infrastructure.Drawing upon proven Liebherr Load Management philosophy for the design of the mainframe, axle box and dump cylinder attachments coupled with the incorporation of the newest technologies available the T282 360 ton/327 metric ton diesel electric AC drive hauler is now a reality.
LIEBHERR'S LOAD MANAGEMENT PHILOSOPHYAND HOW IT APPLIES TO THE T282
This engineering philosophy mandates how loads are transferred into the mainframe from the running gear attachments, and provides for reduction and control of redundant structures. This philosophy also provides a reduction of maintenance intensity, and has proven to improve vehicle operating and maintenance efficiency on otherstandard Liebherr haulers. There are four principal areas where Liebherr uses "Load Management" principals on the T282, the Mainframe, the front suspension arrangement, the dump cylinder attachment and the rear axle attachment.The mainframe design on the T282 allows loads to be taken directly into the rear suspensions on the top centerline of the rear axles. This application of load management in conjunction with the use of A710 high strength steel reduces the potential of stress and high cost maintenance.The front suspension and steering arrangement,, unique on all standard Liebherr haulers, provides a dual parallel control arm arrangement which provides better handling characteristics and extended tire life.The load application is spread over a large mainframe area using this front suspension and steering arrangement reducing unit stress and improving structural life and truck performance.The Liebherr "Load Management Philosophy" is also apparent in the dump cylinder attachment area on the T282. The dump cylinder cross member floats allowing some finite degree of flexibility between the dump cylinder crossmember and the mainframe major structure, reducing torsional deflection shared between the two structures. This attachment improves life of both major components resulting in lower maintenance cost, and improved vehicle operational performance.The rear axle attachment on the T282 also follows Liebherr's "Load Management Philosophy" through the use of a straightforward attachment of the rear axle. This eliminates traditional nose cone problems, reduces stress in individual components, and spreads loads over a large unit area of the rear mainframe. This arrangement also allows mounting of the rear suspensions directly on the center line of the rear axle, maximizing rear axle oscillation.
BRAKE, STEER, AND HOIST SYSTEM
The T282 haul truck brake and steering system are fully hydraulic with accumulator backup systems, which meet SAE codes and operate at pressures of 3000 psi or below. The parking brake system is also backed up by an accumulator providing capability to hold the hauler on grades consistent with SAE requirements.The hoist system on the T282 operates as a independent system from the steering/b raking system and includes electrical joystick operation from the cab, with hydraulic pilot valve components in an adjacent area for easy troubleshooting and system diagnosis.
The T282 is equipped with a Detroit Diesel/MTU 16V4000 engine @ 2750 hp. The 16V4000S engine has lower fuel consumption and runs quiet. The DDC-MTU 16V4000 engine's heavy duty design provides greater durability.
LIEBHERR ELECTRIC WHEEL
The new Liebherr electric traction motors used on the T282 have a unitized configuration, providing plug-in motor, mounted inboard and two stage planetary gear set outboard. The standard gear ratio will provide a maximum 40 mile an hour speed with excellent performance on grade. The wheel design provides for inboard armature speed braking. Applied design parameters on this wheel will give improved life cycle costs compared with existing equipment.
AC DRIVE SYSTEM
The Siemens AC Drive system utilized on the Liebherr T282 is based on technology used by Siemens Energy and Automation, Inc. in applications including shovel drives, locomotive and mass transit system applications.The AC control system provides an additional margin of braking allowing total dynamic retarding capacity up to 6,032 hp and down to.5 miles per hour at which time the service brakes are activated to achieve the final stop. The AC control system also advises the operator of the vehicles operation outside the retarding capability.
As an option, the AC drive system for the T282 has been designed to be operated with a Pantograph and overhead trolley system, providing increased performance on grade with significant fuel savings and extended engine life.
Tires for the T282 are Michelin 55/80 R63 that provide higher load capacity in a smaller diameter tire with the potential of lowering tire costs. The 55/80 R63 tire operates at relatively low inflation pressures (87 psi) and provides package size and weight efficiency.
The T282 is equipped with the RIMEX 6341 "Taper Secure Radial", TSR Series rims. This unique, new generation rim design is formed through machining, to provide a balanced fitment to seal and anchor the radial tire. The resulting total air retention and rims part stability provides for longer rim and tire life. The RIMEX TSR Series, with fully forged, seamless flanges, is the safest, most reliable rim built.
OPERATORS FUNCTIONAL CAB WITH REFINED LUXURY
The operators cab of the T282 has plush upholstery, heavy duty, environmentally specified insulation assuring the lowest dBa levels during all phases of the haulage operation.Incorporated into the cab environment of the T282, is an operators Pentium-based industrial-grade computer. The computer screen is mounted in the dashboard, replacing the traditional gauge arrangement. Designed to be easily read during the trucks operation, the in-cab computer provides more useable information to the driver allowing for quicker assessment of operational functions. The computer displays truck operating parameters such as ground speed, engine information, and drive system status. The T282 in-cab computer also provides secondary information by recording historical operating events and by keeping a history of system fault messages in chronological order.
The new T282 diesel electric AC drive Liebherr hauler, follows the precedent established by the Liebherr 240 ton truck design team in 1982 when the company was the first OEM to take the giant step up in payload capacity. Now Liebherr takes another giant step up in payload capacity to 360 ton /327 metric tons - the first OEM to respond to the Mining Industry's request for a large capacity AC drive haul truck that can be used in both standard operational mines and in trolley applications. Liebherr's T282, the biggest, diesel electric AC drive hauler on two axles in the world!T 262 / T 282 Specification Comparison
|HORSE POWER||2000 - 2500 HP||2682 - 3200 HP|
|TIRE SIZE||40.00 R57||55/80 R63|
|GVW||830,000 LBS.||1,163,000 LBS|
|EVW||330,000 LBS.|| |
|PAYLOAD||240+ TONS||360 TONS|
|WHEELBASE||20 FT.||21 FT. 6 IN.|
|WIDTH*||23 FT. 3 IN.||24 FT.|
|LENGTH||43 FT. 6 IN.||47 FT. 6 IN.|
|HEIGHT (OVER CANOPY)||21 FT. 3 IN.||24 FT.|
|LOADING HEIGHT*||18 FT. 4 IN.||21 FT. 2 IN.|
|SAE TURNING RAD.||48 FT. 6 IN.||53 FT. 8 IN.|