Rexroth A6VM Axial Piston Motor A6VM160 A6VM200 A6VM355

The industrial and mobile-grade A6VM Series Bent-Axis Axial Piston Variable Displacement Hydraulic Motors (specifically highlighting globally procured high-pressure references A6VM355 HD1/63-VZB-020, A6VM160HD1E/63W-VZB010B, and the speed-monitored A6VM200HD1E/63W-VAB010B-S), engineered by Chengyuan Hydraulic, are heavy-duty, high-power-density rotary drive elements. Designed for demanding open and closed-loop hydraulic circuits, large crawler travel drives, rotary drilling rig power heads, high-tonnage marine winches, and industrial shredder systems, these motors utilize a sophisticated $40^{\circ}$ bent-axis design to deliver high volumetric efficiency, immense starting torque, and a wide displacement ratio ($V_{\text{max}}/V_{\text{min}} = 3.47$) for continuous, stepless speed-to-torque conversion.

Engineered to match the exact structural standards, SAE/ISO mounting法兰 specifications, spline shaft splines, high-pressure port positions, and HD1 pilot control functional logic of international premium standards (such as Bosch Rexroth 63 series), Chengyuan’s A6VM motors provide 100% direct drop-in interchangeability. Field maintenance engineers, equipment rebuild facilities, and heavy-duty equipment OEMs can replace worn factory units directly into existing drive bays without modifying fluid plumbing or re-engineering spatial envelopes, reducing supply chain friction and operational downtime.

Because variable displacement piston motors on crawler drives and crane hoist winches function under continuous shock loading, sudden direction reversals, and extreme transient pressure peaks, any slip-shoe delamination, valve plate scoring, or regulatory valve lag will cause uncontrolled load descent or structural overheating. To eliminate field failures, 100% of Chengyuan’s A6VM variable motors undergo 100% rigorous high-power dynamic dynamometer test bench protocols. Each motor is evaluated under full continuous working pressures (40 MPa) and peak pressure spikes (45 MPa) to monitor volumetric retention, mechanical torque output, low-speed crawling stability, and HD1 stroke response accuracy.

Technical Specifications

• Product Classification: Bent-Axis Axial Piston Variable Bidirectional Hydraulic Motor

• Design Generation Profile: A6VM Series (Standard Series 63 Configuration)

• Physical Frame Size & Displacement Boundaries:

  • Size 160 (e.g., A6VM160): Maximum displacement of $160 \text{ cm}^3/\text{rev}$, with peak rotational speeds up to $4250 \text{ rpm}$.

  • Size 200 (e.g., A6VM200): Maximum displacement of $200 \text{ cm}^3/\text{rev}$, with peak rotational speeds up to $3900 \text{ rpm}$.

  • Size 355 (e.g., A6VM355): Maximum displacement of $355 \text{ cm}^3/\text{rev}$, with peak rotational speeds up to $3200 \text{ rpm}$.

• System Pressure Ratings:

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

  • Maximum Peak Transient Pressure: $45.0 \text{ MPa}$ (450 bar / 6525 psi)

• Control Mechanism Profile: HD1 / HD1E Hydraulic proportional control (where displacement changes proportionally with input pilot pressure; “E” designates proportional solenoid pilot stages or electronic accessories).

• Technical Nomenclature Breakdown:

  • Part Reference: A6VM355 HD1/63-VZB-020

    • 355: Denotes maximum displacement of $355 \text{ cm}^3/\text{rev}$.

    • HD1: Hydraulic proportional adjustment dependent on pilot input.

    • 63: Represents the series 63 design lineage.

    • VZB: Specifies double-acting flushing/boost valve layout, specialized splined drive shaft, and viton casing seals.

  • Part Reference: A6VM160HD1E/63W-VZB010B

    • 160: Denotes maximum displacement of $160 \text{ cm}^3/\text{rev}$.

    • HD1E: Blends hydraulic pilot control with an electronic proportional regulatory solenoid stage.

    • W: Wide fluid-channel port arrangement optimized for both open and closed circuits.

    • 010B: Designates control threshold starting parameter calibration.

  • Part Reference: A6VM200HD1E/63W-VAB010B-S

    • 200: Denotes maximum displacement of $200 \text{ cm}^3/\text{rev}$.

    • “-S”: Features a factory-integrated, high-resolution digital speed sensor for closed-loop RPM monitoring.

Key Technical Advantages

• High-Angle $40^{\circ}$ Spherical Valve Plate Configuration: The internal rotor and piston assemblies utilize a spherical valve plate profile. The tapered pistons are coupled via ball-joints directly to the drive shaft flange at a high $40^{\circ}$ operating angle. This design eliminates traditional slipper pads and high-pressure wear faces, increasing self-priming limits, improving starting torque efficiency by 15%, and enhancing resistance to severe hydraulic shocks.

• Heavy-Duty Opposed Tapered Roller Bearings: The drive shaft assembly is supported by high-load, precision-matched tapered roller bearings. This configuration accommodates high continuous external radial and axial forces from pinion gears, sprockets, or universal joints, extending the B10 operational life of the motor to over 12,000 hours.

• Nitrided Ductile Iron Cylinder Block & Micro-Honed Spools: The cylinder block is cast from high-tensile ductile iron (QT500-7), with piston bores micro-honed and gas-nitrided for high surface hardness. This tight geometric tolerance preserves a dynamic lubricating oil film under extreme high-pressure/high-temperature cycles, keeping internal cross-port case leakage under 1.8% of total flow.

• High-Response Integrated HD1 Servo Stroking Mechanism: The displacement adjustment mechanism is fully enclosed within the motor end cap, using multi-stepped internal orifices for smooth servo control. When a pilot signal is received, the servo piston adjusts the cylinder block angle within milliseconds, enabling seamless, stepless transitions between high-speed/low-torque and low-speed/high-torque configurations during sudden load shifts.

Application Areas

A6VM series variable displacement high-pressure motors serve as primary heavy-duty hydrostatic rotary actuators across various heavy industries:

• Heavy Tracked Construction Equipment: Undercarriage crawler drives for heavy excavators, and primary hoist winch packages for large-tonnage crawler cranes.

• Foundation Drilling & Tunnelling Machinery: Main rotary head assemblies for rotary drilling rigs and auxiliary cutterhead variables for tunnel boring machines (TBM).

• Marine & Offshore Engineering Deck Gear: Deep-sea umbilical winches, mooring winches, cargo cranes, and industrial offshore drawworks.

Expert Maintenance Tips

• The Motor Housing Must Be Fully Pre-Filled with Clean Hydraulic Oil Via the Highest Case Drain Port Prior to Initial Start-Up: Due to the internal architecture of bent-axis designs, dry start-ups will leave the drive shaft bearings, piston ball-joints, and spherical valve plates without lubrication. This can cause severe galling, thermal locking, or complete component failure within seconds of engagement.

• The Continuous Internal Case Drain Pressure Must Never Exceed $0.2 \text{ MPa}$ ($2 \text{ bar}$): Monitor the return-line system backpressure regularly. Restricted case drain lines or clogged return filter elements can cause excessive pressure that blows out the high-pressure shaft seal, leading to fluid loss and damaging internal rotating components.

• Do Not Strike the Sensor Housing of Models Equipped with a Speed Sensor (Suffix -S): The speed sensor houses sensitive electronic Hall-effect components with micro-level air gaps. Avoid using the motor body as a leverage point during installation, and maintain fluid cleanliness to ISO 4406 18/16/13 or better to prevent fine metallic particulates from gathering on the magnetic sensor face and distorting the signal.