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Rexroth A6VM160HA2T/63W-VAB020A Hydraulic Motor
Overview
The Rexroth A6VM160HA2T/63W-VAB020A is a high-performance axial piston variable displacement motor manufactured by Bosch Rexroth. As part of the A6VM series, this motor features a bent-axis design and is engineered for hydrostatic transmissions in both open and closed circuits, delivering precise control of fluid flow and exceptional reliability in demanding mobile and industrial applications. The A6VM series is widely recognized for its high power density, wide control range, high overall efficiency, and long service life.
Technical Features
Bent-Axis Design with Axial Tapered Piston Rotary Group — The motor utilizes a bent-axis design with an axial tapered piston rotary group, specifically engineered for hydrostatic drives in both open and closed circuits. This design enables efficient hydraulic power conversion with high power density and smooth operation.
High Displacement & Pressure Capacity — The motor has a geometric displacement of 160 cm³ per revolution. It operates at a nominal pressure of 400 bar and can withstand maximum intermittent pressures up to 450 bar, making it suitable for high-pressure heavy-duty hydraulic systems.
HA2T Hydraulic Automatic Pressure-Related Control — The motor is equipped with HA2T control, which provides hydraulic, pressure-related automatic control with a hydraulic override function. The HA2T control operates based on the pressure difference (Δp) between the high-pressure and low-pressure sides, automatically adjusting displacement according to system pressure variations. An integrated pressure relief valve is also incorporated, offering precise operational command and vital system protection.
Stepless Variable Displacement — The displacement can be infinitely changed from Vg max (maximum displacement) to Vg min (=0), providing exceptional flexibility to adjust output speed and torque according to different working requirements. The output speed depends on the pump flow rate and the motor displacement, while the output torque increases with the pressure difference between the high-pressure and low-pressure sides and with increasing displacement.
Wide Speed Range — The motor is approved for very high rotational speeds while maintaining excellent low-speed operating characteristics. The A6VM160 series offers a maximum speed of 3,100 rpm at maximum displacement and up to 4,900 rpm at reduced displacement, offering a broad control range that satisfies both high-speed and high-torque requirements.
High Flow Capacity — The motor has a maximum flow rate of approximately 496 L/min at maximum speed, providing substantial hydraulic power for demanding applications.
High Torque Output — The motor delivers high torque output, with a theoretical torque value of 1,019 Nm at a pressure difference of 400 bar, ensuring powerful performance in heavy-load conditions.
High Power Density — The motor offers high power density, meaning it delivers substantial power output relative to its size and weight, contributing to space-saving installation and efficient system design.
Compact & Robust Construction — The motor features a compact, robust bearing system that provides a long service life, high reliability, and excellent starting characteristics. The cast iron housing ensures durability in demanding environments.
FKM Seals for Wide Temperature Compatibility — Equipped with FKM (fluoroelastomer) seals, this motor is compatible with various hydraulic fluids and suitable for operation across a wide temperature spectrum, ensuring reliable performance in diverse operating conditions.
High Volumetric Efficiency & Low Noise — The motor offers high volumetric efficiency, smooth operation, good flow uniformity, and low noise levels, contributing to overall system efficiency and operator comfort.
Reversible Rotation — The motor supports fully reversible rotation, offering flexibility for bidirectional drive applications without performance compromise.
Good Starting Characteristics & Low Swing Torque — The motor features excellent starting characteristics and low swing torque, enabling smooth and responsive operation even under heavy starting loads.
Wide Operating Range — The wide control range of the A6VM series enables the variable motor to satisfy requirements for both high speed and high torque, making it versatile across a broad spectrum of operating conditions.
Series 63 Index — The 63W series index indicates Series 6, Index 3, Standard version, representing the latest design iteration within the A6VM product family.
Key Functionalities
Hydrostatic Transmission in Open and Closed Circuits — The motor is designed for hydrostatic drives in both open and closed circuits, providing versatility for various hydraulic system configurations. In closed circuit systems, the motor operates within a sealed hydraulic loop where fluid is continuously recirculated between the pump and motor, minimizing losses and leakage. In open circuit systems, fluid is supplied from a central pump through a directional control valve and returns to the reservoir after each cycle.
Stepless Speed and Torque Control — The motor's output speed depends on the pump flow rate and the motor displacement, while the output torque increases with the pressure differential between the high-pressure and low-pressure sides and with increasing displacement. The wide control range enables the variable motor to satisfy requirements for both high speed and high torque, with displacement infinitely adjustable from maximum to zero.
HA2T Automatic Pressure-Related Control — The HA2T control system automatically adjusts the motor's displacement based on the pressure difference (Δp) between the high-pressure and low-pressure sides. As system pressure increases, the control mechanism responds by adjusting displacement to maintain optimal performance. The hydraulic override function provides additional flexibility for specific operational requirements, while the integrated pressure relief valve protects the system from overpressure conditions.
High Starting Torque — The bent-axis design naturally provides excellent starting characteristics and high starting torque, enabling the motor to easily overcome heavy breakaway loads in demanding applications such as excavators, cranes, and other heavy machinery.
Energy Efficient Operation — The variable displacement capability enables energy savings by allowing the motor to deliver only the flow and torque required by the load. By eliminating the need for gear shifts and enabling the use of smaller pumps, the A6VM series contributes to reduced energy consumption and lower operating costs. High volumetric efficiency further enhances overall system efficiency.
Compact System Integration — The compact design and robust construction allow for easy integration into both mobile and stationary hydraulic systems, with the ability to be mounted directly to equipment without complex installation procedures.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, wear-resistant components, and high-precision bearings, the motor ensures long-term operational stability with minimal maintenance requirements, reducing downtime and total cost of ownership.
Cost Savings Through Simplified Design — The wide control range enables cost savings through the elimination of gear shift mechanisms and the possibility of using smaller pumps, reducing overall system complexity and component costs.
Application Sectors
The Rexroth A6VM160HA2T/63W-VAB020A hydraulic motor is designed for heavy-duty mobile and industrial applications requiring high-pressure, high-power hydraulic drives with precise speed and torque control. The A6VM series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Construction Machinery | Excavators, wheel loaders, bulldozers, pavers, crawler-type machines, drilling rigs, backhoes, loading tractors, concrete pump trucks, wheel cranes, slewing drives, track drives |
| Agricultural Machinery | Combine harvesters, tractors, self-propelled agricultural equipment, heavy agricultural machinery requiring consistent torque across a wide speed range |
| Material Handling Equipment | Forklifts, pallet trucks, conveyor systems, winches, cranes (mobile and stationary), heavy material handling systems |
| Marine & Offshore | Ship propulsion systems, deck machinery, marine cranes, winches, steering gear, dredging equipment |
| Mining Equipment | Conveyor drives, crushers, excavators, material handling systems, mining machinery, drilling equipment |
| Industrial Machinery | Hydraulic presses, injection molding machines, blow molding equipment, plastic machinery, die-casting machinery, machine tool controls |
| Steel & Metallurgy | Rolling mills, continuous casting lines, steel mill hydraulic equipment |
| Forestry Equipment | Loggers, harvesters, forwarders, forestry machinery requiring high torque at low speeds |
| Waste Management & Recycling | Shredders, balers, crushers, material separators |
| Mobile & Stationary Applications | Both mobile equipment (traveling machinery) and stationary industrial applications requiring reliable hydraulic power |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A6VM |
| Model Code | A6VM160HA2T/63W-VAB020A |
| Material Number (MNR) | R971042037 |
| Motor Type | Axial piston variable displacement motor (bent-axis design) |
| Circuit Type | Open circuit and closed circuit |
| Displacement (Vg max) | 160 cm³/rev |
| Nominal Pressure (Continuous) | 400 bar (5,800 psi) |
| Maximum Pressure (Intermittent) | 450 bar (6,525 psi) |
| Maximum Speed (at Vg max) | 3,100 rpm |
Maximum Speed (at Vg | 4,900 rpm | |
| Maximum Flow Rate | 496 L/min |
| Torque Output (Δp = 400 bar) | 1,019 Nm |
| Control Type | HA2T — Hydraulic automatic pressure-related control with hydraulic override and integrated pressure relief valve |
| Control Basis | Pressure difference (Δp) between high-pressure and low-pressure sides |
| Rotation Direction | Reversible |
| Housing Material | Cast iron |
| Seals | FKM (fluoroelastomer) |
| Weight | 62 kg (typical for A6VM160 series) |
| Fluid Compatibility | Mineral oil-based hydraulic fluids, various hydraulic fluids compatible with FKM seals |
| Operating Temperature Range | Wide temperature spectrum (compatible with FKM seals) |
| Fluid Cleanliness Requirement | ISO 4406 minimum |
| Series Index | 63W (Series 6, Index 3, Standard version) |
Conclusion
The Rexroth A6VM160HA2T/63W-VAB020A is a high-performance axial piston variable displacement motor that exemplifies Bosch Rexroth's decades of expertise in hydraulic drive technology. With its advanced bent-axis design, HA2T automatic pressure-related hydraulic control with hydraulic override, excellent suction characteristics, and robust cast iron construction, it delivers exceptional power density, precise speed and torque control, and reliable operation for demanding hydrostatic transmission applications.
The motor's defining feature is its HA2T control system, which provides hydraulic, pressure-related automatic control based on the pressure difference between the high-pressure and low-pressure sides, with an integrated pressure relief valve for system protection. This control mechanism enables the motor to automatically adjust displacement according to system pressure variations, optimizing performance while protecting the system from overpressure conditions.
With high pressure capability (nominal 400 bar, maximum 450 bar), a wide control range that satisfies both high-speed (up to 4,900 rpm) and high-torque (1,019 Nm at 400 bar) requirements, high volumetric efficiency, low noise operation, and a robust bearing system providing long service life, this motor is an ideal solution for a wide range of applications — from construction machinery, agricultural equipment, and material handling systems to marine propulsion, mining equipment, industrial machinery, and forestry applications.
As a proven, reliable, and energy-efficient solution for hydrostatic drives in both open and closed circuits worldwide, the A6VM160HA2T/63W-VAB020A stands out as a versatile component where consistent high-pressure performance, precise automatic control, and long-term dependability are essential requirements.
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