A6VM Series 71

The A6VM Series 71 represents Rexroth's latest generation of swashplate axial piston variable displacement motors designed for high-pressure, high-performance applications. Compared to the classic Series 63, it delivers comprehensive upgrades in pressure ratings, power density, and size classification.

First, Core Technical Parameters

Series 71 achieves industry-leading pressure performance:

Pressure Rating: Nominal pressure increased to 450 bar (45 MPa), with peak pressure reaching up to 500 bar.

Size Range: Covers sizes from 60 to 280 (e.g., A6VM060, A6VM085, A6VM115, A6VM150, A6VM170, A6VM215, A6VM280).

Displacement Adjustment: Displacement is infinitely variable from maximum to zero, enabling an exceptionally wide speed control range.

Second, Key Technical Advantages

1. Higher Power Density: With rated pressure increased from 400 bar to 450 bar, greater torque and power output are achieved within the same installation volume.

2. Optimized Size Gradation: New size classifications (e.g., 85, 115, 150) precisely match modern hydraulic system flow requirements, minimizing overflow losses.

3. Advanced Wobble-Shaft Design: Retains the high-efficiency conical piston rotor assembly, delivering excellent starting torque and high-speed stability for both open and closed circuits.

Third, Differences from Other Variable Displacement Motors

The A6VM Series 71 represents Rexroth's latest flagship bent-axis variable displacement motor. Key distinctions from other variable displacement motors (such as common swashplate types or the previous A6VM 63 series) lie in three dimensions: core architecture, pressure limits, and displacement coverage.

1. Structural Performance Differences: Bent-Axis vs. Swashplate

Swash Angle Range: The A6VM employs a bent-axis design, where the angle between the piston rotor assembly and the main shaft can exceed 40 degrees. Conventional swashplate variable motors, constrained by their shoe structure, typically have smaller swash angles. This enables the A6VM to achieve a wider displacement adjustment range and operate across a broader speed spectrum.

Starting Torque: The bent-axis structure eliminates the shoe overturning issues common in swashplate motors, resulting in higher mechanical efficiency during low-speed starts and smoother starting torque delivery.

2. Generational Leap in Pressure Ratings

Higher Load Capacity: Series 71 features a nominal pressure rating increased to 450 bar, with peak pressure reaching 500 bar. In contrast, most general-purpose variable displacement motors or the older Series 63 remain at the 350-400 bar level. This means the Series 71 delivers greater power output within the same volume.

3. Precision in Displacement Specifications (Differences from the older A6VM)

New Model Layout: The Series 71 introduces non-standard displacement specifications such as 85, 115, 150, 170, and 215.

Efficiency Matching: This granular displacement allows for more precise matching with the flow output of modern hydraulic pumps. It avoids overflow losses caused by excessive displacement, improving the fuel efficiency or energy efficiency of the entire machine system.

4. Intelligent Control Systems

The A6VM Series 71 optimizes EP (Electro-Proportional) sensor integration for electronic trends. Its response frequency and control precision surpass traditional hydraulically piloted motors, facilitating seamless integration into heavy machinery's CAN bus control systems.

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