Vickers Duraforce HMV and HMR Motors

Vickers DuraForce HMV and HMR motors are variable displacement axial piston motors of swashplate design, suitable for open and closed loop hydrostatic drives. HMV motors offer stepless or two-position displacement control, electric or hydraulic, and can be set to 0 cm³/rev. HMR motors are pressure-regulated, automatically shifting displacement in response to system pressure without external control lines.

Both series are built for high starting torque and smooth, repeatable torque delivery at low speed, supporting a wide torque/speed conversion range and highly dynamic response. A modular design with interchangeable controls, mounting flanges, drive shafts and auxiliary functions (purge and case flushing, crossline relief protection, counterbalance valves, speed sensors) allows the motor to be configured for a specific application.

An optional PTO through-drive, available on the larger HMV sizes, provides two shaft ends for direct installation in the drive line without a separate transfer gearbox, reducing noise and improving overall efficiency. Double and tandem motor arrangements, combining two HMV units, are also available for applications requiring a wider torque/speed conversion range or higher torque at the same gearbox interface.

Key Specifications

HMV Variable Displacement Motors

HMR Regulated Variable Displacement Motors

Continuous and maximum torque and power figures above are theoretical, based on continuous or maximum operating pressure respectively. Maximum continuous speed is also available at minimum displacement, exceeding the maximum-displacement rating; intermittent speeds (short-term, higher than continuous) are available in the full technical catalogue.

Control Options

H1 / E1 – Stepless variable control

Suitable for open and closed loop circuits. Without a control signal, the motor shifts to maximum displacement. Displacement is controlled hydraulically (H1) or via an electric proportional signal (E1). Minimum response time from zero to maximum displacement is approximately 0.5 to 1 second with standard orifice and 20 bar servo pressure.

H2 / E2 – Two-position control

Suitable for open and closed loop circuits. Without a control signal, the motor is set to maximum displacement; adjustment between minimum and maximum is smooth with a short response time. The switching signal is hydraulic (H2) or electric (E2).

EH1P / EH1P-CA – Stepless with pressure override

Used primarily for closed loop operation with a speed-dependent hydraulic pump (type HPV CA), or with hydraulically or electro-hydraulically piloted drives requiring a high-pressure regulating function. Without a control signal, the motor shifts to maximum displacement; stepless control to lower displacement is hydraulic. A system pressure override automatically increases displacement in response to torque demand at a predefined setting (adjustable, 150 to 260 bar).

HMR pressure regulation

HMR motors shift to minimum displacement at system pressures below the regulation begin point (adjustable, 150 to 260 bar) and smoothly increase displacement as the defined high-pressure regulation point is reached, to match torque required by the system. Override control (pneumatic, hydraulic or electric) can force maximum displacement independent of the control pressure. No external control lines are required for the core pressure-regulation function.

Downloads

• Download the Eaton Vickers Duraforce HMV HMR Series Technical Catalogue >>>

This product is no longer available

The Vickers Duraforce HMV and HMR motors have been discontinued and is no longer available to buy new. This page is kept live for reference and to help customers identify legacy parts and equipment.

If you have a Vickers Duraforce HMV or HMR motor and need a modern equivalent or replacement, please contact our team. We can help identify the right current-production alternative and advise on sourcing options for maintaining existing installations in the meantime.