Hytec and Bosch Rexroth Germany develop world-first hydraulic solution for tracked carriers
Submitted by: CubicICE (PTY) Ltd
Hytec South Africa and Bosch Rexroth Germany joined forces to develop a hydraulic solution for Bell Equipment that would minimise ground compaction in tracked carriers used in mining and construction. The OEM needed to ensure that its new range of tracked carriers (TC 7 & TC 11) performed optimally in soft underfoot conditions without negatively impacting the ground. They also had to be able to operate in environmentally sensitive areas where ground compaction is unacceptable.
Bosch Rexroth Germany assisted with the required system calculations and made useful recommendations regarding component selections of the hydrostatic drive system, including the prototype tandem drive pumps, motors and planetary reduction drives. Hytec ensured that the hydraulic drive component installation by Bell Equipment engineers was in accordance with Rexroth specifications.
Data from Bosch Rexroth Germany enabled Bell Equipment’s engineers to conduct installation checks and commission the hydraulic system. Subsequent to prototype completion, extensive durability and performance tests (simulated normal operating procedures) were conducted at Bell Equipment’s Richards Bay factory. As the request for this specified equipment originated in America, extensive testing was also carried out on customer sites in the United States.
Bosch Rexroth products and components used in the TC range include tandem closed loop pumps for oil flow and drive pressure; variable displacement piston motors to drive the tracks; and planetary reduction drives. These drives, when placed between the piston motor and track, multiply the delivered torque.
“Fine tuning and optimisation were done by Bell Equipment engineers, in collaboration with Bosch Rexroth Germany’s engineers,” explains Berndt Wichmann, Hytec SA Regional Technical Manager, KZN Region. “This teamwork helped to achieve optimal vehicle control and performance.”
“Feedback from the intensive US test programme was encouraging,” adds, Ryan Lombard, Product Designer for Bell Equipment. “It surpassed our expectations, with all features designed into the machine having proved themselves in the various applications.”
Demand for this type of vehicle in the construction and mining industries stems from Bell Equipment’s US customers requiring a niche solution for soft underfoot conditions. This initiated extensive market research and, after a stringent design process, the development of the TC7 and TC 11 tracked carriers. Each meets the needs for short haul tasks in mining, construction, oil & gas and the pipe-laying industries for work in soft underfoot conditions.
“We are now an official production partner to the Bell TC range, offering continuous support to machine production and the aftermarket, as well as technical and future product development support,” Wichmann concludes.
Hytec and Bosch Rexroth have previous experience with Bell Equipment in supplying componentry and helping develop hydraulic systems for a range of machinery used in mining, construction, agriculture and other industries.
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