Industry brief · Source published October 2, 2026
A Bosch Rexroth article dated October 2, 2026 argues that hydraulic drive motors should be compared by usable power over the required operating envelope, not by a single peak-pressure value. Its discussion concerns Hägglunds motors; the selection principle is relevant to the motor and cylinder system around heavy machinery.
Engineering significance
Hydraulic motor torque depends on displacement, pressure differential, and efficiency; output power also depends on speed. A high permitted pressure at one operating point does not prove that a motor can sustain the needed torque and speed together. Continuous and intermittent ratings, oil temperature, cooling, and mechanical limits should be read from the same duty map.
What buyers should check
- Request a torque-speed operating map for normal, start-up, and upset conditions.
- Separate continuous duty from intermittent overload and define the duration of each.
- Check pressure losses in valves and lines so motor inlet pressure is not mistaken for effective motor differential pressure.
Application to custom hydraulic projects
The same discipline helps when specifying hydraulic cylinders: force, speed, stroke, and duty must be checked together with the power unit. Vendor examples and ratings in the source are specific to those products and do not describe Yongjian equipment.
Related product: Port Crane Hydraulic Power Unit.
Source: Bosch Rexroth: Look Beyond the Pressure Ratings. This independent summary is not a manufacturer announcement by Yongjian. Cover is an original conceptual diagram, not a product photograph.