Short, Light, Efficient: Radial Piston Motor MCR-S

Bosch Rexroth has expanded its range of radial piston motors with the introduction of the MCR-S. Perfectly suited for chain drive applications, the new motor boasts optimized installation design and delivers increased power density along with enhanced starting efficiency and smooth operation.

Mobile construction machines become increasingly sophisticated. The MCR-S optimally caters for these demands. To deliver a more compact solution, Bosch Rexroth has repositioned the parking brake to the body of the motor, integrated the two-speed shifting spool within the motor distributor and optimized the main port locations. The result is a motor which is up to 33% shorter, 41% lighter and fully optimized for ease of installation and to deliver enhanced efficiency without compromising durability.

Complementing its compact design is the new Rexroth MCR4 frame size – which is specifically developed for motor displacements between 325cc and 470cc – and 9-piston rotary group, contributing to a significantly increased torque density. In practice, the 9-piston rotary group layout helps to limit the maximum vehicle travel speed.

“As mobile construction machines continue to become increasingly complex and sophisticated, we’ve seen far greater demands for space within the engine compartment, making the motor length a critical design factor,” says Gary Whitelaw, MCR Director of Sales at Bosch Rexroth.“ To that end, our new MCR-S has been specifically engineered to answer these demands – and do so in a way, which doesn’t simply answer the need for more space, but also drives greater levels of efficiency throughout its lifetime.

“Of course, in the harsh environments in which these machines operate, durability remains a key focus. That’s why, with the Rexroth MCR-S, we’ve incorporated an enhanced rotary group design to deliver a greater low speed capability. In practice, that means increased starting efficiency, delivering high torque even at zero RPM as well as being optimized to handle high temperature applications.”

Reflecting the core characteristics of Bosch Rexroth’s range of radial piston motors, the MCR-S utilizes low friction properties within the flow passages and rotating elements of the motor to deliver enhanced levels of efficiency. It is these same traits which ensure precise controllability, maximum efficiency and durability, even in high temperature applications.