Black Bruin low speed high torque (LSHT) hydraulic motors with independent dual braking meet new SANS 1589 specifications.
New legislation
As part of an ongoing drive to improve the safety of its operations, the mining industry constantly monitors the safety of its mining equipment. This includes mining vehicles such as load haul dumps, utility vehicles, graders and trailers with drive assist capabilities. SABS standard SANS 1589 specifies the requirements for the braking performance of load haul dumpers and dump trucks for use underground. A revised standard is to be implemented in April 2011 and will affect hydrostatic transmission systems used underground by specifying the use of two separate and independent braking systems: a dynamic brake and an emergency or parking brake.
Axiom Hydraulics has designed and supplied hydrostatic transmissions for the past 40 years. The company welcomes this new legislation and believes that it will have a significant positive effect on the safety of mining vehicles. Its range of Black Bruin LSHT dual brake hydraulic motors adheres to this new legislation, putting it at the forefront of these new developments. Axiom already has more than 500 of these motors in use in mining applications throughout Africa.
Dual braking
The Black Bruin hydraulic motor range is backed up by over 30 years of research and experience in high torque wheel hub motors.
The BBC motors with dual braking have closed multidisc brakes which are ideal for tough conditions. The operating brake is separate from the parking brake. They are also equipped with wear indicators for friction discs and have optional flushing for heat extraction from the brake chambers. The organic friction material offers better wear resistance and thus keeps the oil free of any contaminants.
Superior starting torque
The radial piston motors are precisely balanced, providing constant ripple free output torque. Available in motor sizes from 862 cc through to 1690 cc, they are able to supply torques up to 7000 Nm.
The high starting torque surpasses by 10% to 20% the performance of high-speed hydraulic motors connected to a speed reducer. Thus maximum pull force of the vehicle is achieved when starting from standstill. The multiple stroke, radial piston design also allows smooth, steady traction at a speed close to zero. This improves operator comfort, lowers noise levels and reduces fuel consumption.
Wide speed range
Black Bruin hydraulic motors also offer a wider operating speed range than most hydraulic motors. In mobile equipment applications the speed ranges are selected either by freewheeling or by using two-speed motors.
The freewheeling feature, which can be either mechanical or hydraulic, allows the motors to work in multispeed transmission designs, or to be freewheeled on towed vehicles at high speeds. The motors can be re-engaged or disengaged while the vehicle is moving. Hydraulic power is not required when the mechanical free wheel option is installed.
When using two-speed motors, halving the volumetric displacement for each motor revolution doubles the running speed.
Compact design
Black Bruin hydraulic motors can be easily mounted on vehicle wheel rims. Their light and compact design permits a wide variety of wheel hub applications in mobile equipment design and old-fashioned axles or speed reducers are no longer a necessity.
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