Rexroth A6VM Motor A6VM160 A6VM55 A6VM140 Piston Motor

The industrial-grade Rexroth A6VM Series Heavy-Duty Bent-Axis Variable Piston Motors, engineered by Chengyuan Hydraulic, are premium high-power-density hydraulic energy conversion actuators designed for open and closed-circuit hydrostatic drive networks. This product profile specifically targets high-demand, high-performance identifiers embedded across international B2B heavy-duty industrial supply frameworks: A6VM160HD1E/63W-VZB010B, A6VM160HA1/60W0600-PZB086A-K, as well as standard displacement frames including A6VM55, A6VM140, and A6VM160.

Utilizing a highly sophisticated $40^\circ$ bent-axis variable design equipped with tapered pistons, the A6VM series solves the technical limitations that traditional swashplate motors face when operating under a broad speed-to-torque variance. By incorporating a wide-angle stroke capability (enabling a volumetric variation ratio up to 5:1 and even variable to zero displacement), these motors deliver massive output torque at high loads while safely achieving exceptionally high rotational velocities under minimal displacement modes. Chengyuan’s premium replacement variants offer 100% direct drop-in interchangeability with authentic Bosch Rexroth manufacturing specifications. Every structural dimension—including the mounting flanges, output spline shafts, SAE high-pressure working ports, case drain ports, and control pilot inputs—aligns perfectly with original manuals, enabling field rebuilds without custom mechanical retrofits.

As primary mechanical drive components in heavy-duty mobile machinery, variable piston motors operate under a continuous pressure regime of up to $40.0 \text{ MPa}$ coupled with severe shock loads. If the critical tribological interfaces—such as the cylinder block face mating the valve plate or the tapered piston rings riding within the bores—sustain oil film shearing or localized overheating, volumetric efficiency drops instantly, risking piston seizure or catastrophic barrel face breakdown. To eliminate this, 100% of Chengyuan’s A6VM variable motors undergo 100% strict dynamic simulation on digitized high-pressure test stands. Validated under maximum system continuous pressures and peak torque spikes, every motor’s conversion profile, pilot control accuracy for both HD (Hydraulic Proportion) and HA (Automatic High-Pressure Related) variants, and total volumetric output are mapped and certified.

Technical Specifications

• Product Classification: High-Pressure Bent-Axis Variable Piston Motor

• Compatible Base Series Platform: Full engineering adaptation for Rexroth A6VM Series 60, 63, and 65 heavy-duty platforms

• Displacement Configurations & Geometries:

  • A6VM55 Series: Maximum geometric displacement of $55.5 \text{ cm}^3/\text{rev}$

  • A6VM140 Series: Maximum geometric displacement of $140 \text{ cm}^3/\text{rev}$

  • A6VM160 Series: Maximum geometric displacement of $160 \text{ cm}^3/\text{rev}$

• Nominal Operating Pressure Limits: $40.0 \text{ MPa}$ (400 bar / 5800 psi) continuous rating

• Peak Permissible Circuit Pressure: $45.0 \text{ MPa}$ (450 bar / 6525 psi) maximum spike load

• Rotational Shifting Velocity Parameters:

  • At maximum displacement state: Rated safe speeds range from $2500\sim 4450 \text{ rpm}$ depending on frame size

  • At minimum or zero displacement state: Maximum safe un-loaded speeds reach up to $4000\sim 6300 \text{ rpm}$

• Technical Control Methods Deconstruction:

  • Replacement Reference: A6VM160HD1E/63W-VZB010B

    • Control Strategy: HD1E Control Valve (Hydraulic Control, Pilot-Pressure Related, with Proportional Valve). The motor’s displacement varies in direct proportion to the pilot pressure routed to the control terminal. This electro-hydraulic layout is engineered for digitized track drives or hoist systems requiring synchronized speed ramping and decelerations.

  • Replacement Reference: A6VM160HA1/60W0600-PZB086A-K

    • Control Strategy: HA1 Control Valve (Automatic Control, High-Pressure Related). This represents an automatic high-pressure sensing control. When external drag forces elevate working pressure past a predefined calibration threshold, the motor automatically adjustments toward maximum displacement to output immense torque. Once load resistances ease, displacement downsizes to prioritize high-velocity travel. Optimized for mobile tracking machinery.

• Main Shaft Seal & Spline Parameters: Equipped with a high-durability FKM shaft seal, matching SAE/ISO mounting and shafting arrays

• Average Component Weight: A6VM55 approx. $22 \text{ kg}$, A6VM140 approx. $70 \text{ kg}$, A6VM160 approx. $85 \text{ kg}$

Key Technical Advantages

• Bi-Metal Sintered Valve Plate Friction Matrix: The critical fluid valve plate face undergoes a specialized vacuum high-frequency bonding process to fuse a high-density, low-friction copper-bronze alloy layer to its steel base. Even under $40.0 \text{ MPa}$ continuous full-load states where oil films suffer extreme shear stress, the micro-polished mating faces maintain a low friction coefficient, eliminating high-temperature seizure and galling.

• High-Angle Tapered Piston Core Structure: Features an integrated $40^\circ$ wide-angle bent-axis tapered piston layout. Compared to traditional swashplate designs, this architecture radically diminishes internal parasitic lateral forces while maintaining exceptional volumetric sealing stability during high-speed low-displacement cycles, keeping aggregate volumetric efficiency consistently above 95%.

• Heavy-Duty Oversized Anti-Fatigue Tapered Bearings: Main shaft stability is sustained by heavy-duty tapered roller bearing pairs. The bearing race undergoes induction hardening and super-finishing to ensure immense dynamic and static load limits, fully absorbing cyclical external axial pulling and high-frequency radial forces to maximize main-frame service life.

• CFD-Sculpted Hydro-Damped Control Orifice Porting: The internal fluid passages feeding the HA and HD pilot regulators are optimized via 3D Computational Fluid Dynamics (CFD) to balance orifice dynamics and dampening characteristics. This ensures that during severe load spikes, the displacement shift activates smoothly with zero hydraulic shock waves, eliminating driveline judder.

Application Areas

Chengyuan’s high-grade replacement Rexroth A6VM series motors are deployed inside punishing high-pressure traction, rotation, and hoist applications:

• Heavy Rotary Drilling Rigs & Diaphragm Wall Cutters: Operating as primary rotary head power units subject to intense torque spikes and severe mechanical counter-shocks.

• Crawler Crane, Tunnelling Machine, & Asphalt Paver Travel Blocks: Utilizing precise HA/HD variable regulation to ensure seamless velocity tracking and smooth climbing across variable track conditions.

• Marine Mooring Winches, Hydraulic Piling Hoists, & High-Speed Shredder Drives: Relying on the 5:1 displacement range to toggle efficiently between high-speed light-load pulling and slow-speed high-torque lifting.

Expert Maintenance Tips

• Pre-Fill the Motor Housing Completely with Clean Hydraulic Oil via the Case Drain Port Before Initial Field Commissioning: This is a vital rule for bent-axis piston components. Because internal bearings and piston-barrel sliding interfaces rely entirely on case drain oil accumulation for splash and boundary lubrication, starting a dry housing will cause instant, catastrophic heat seizure of the friction pairs within seconds of shaft rotation under pressure.

• Do Not Alter or Turn the External Pressure Adjustment Screws on the HD or HA Control Valve Bodies: These regulators are factory-calibrated on digital test blocks to align with the original equipment manufacturer’s (OEM) displacement reaction thresholds. Adjusting these screws without a precise reference gauge or original control curve will disrupt displacement synchronization, causing track tracking errors, vehicle pulling, or diesel engine overloading and stalling.

• Limit the Maximum Internal Case Drain Pressure Strictly to 0.2-0.3 MPa (2-3 bar) During Operation: If the case drain plumbing is bottlenecked, crimped, or routed through a heavily fouled filter element, internal housing pressure will escalate. Once housing back-pressure exceeds the limits of the FKM shaft seal, it will rupture or pop out the seal, causing massive oil loss while simultaneously risking slider-barrel separation under high-speed reversing cycles.