Hydraulic Motor Designed To DNV Standards
Product Description
Hydraulic Motor Designed To DNV Standards
Product Introduction:
The Hydraulic Motor Designed To DNV Standards represents the pinnacle of reliability and performance for marine and offshore applications. Engineered specifically to meet the rigorous requirements of the DNV (Det Norske Veritas) ship classification society, this motor is built to withstand extreme operating conditions while ensuring maximum safety and longevity.
At its core, this motor utilizes a robust radial piston design featuring a fixed casing and a rotating cylinder body/hollow shaft. Hydraulic pressure acts on evenly distributed plungers, transmitting force through cam rollers to a fixed cam ring, which generates high torque directly proportional to the system pressure.
Working Principium:
XHAC motor is radial hydraulic motor. Its casing is fixed, but the oil cylinder/solid shaft rotate. The oil cylinder body is mounted on the roller bearing in the casing. Even number pistons are distributed in the hole of the oil cylinder. Oil distributor supply oil exactly to each piston and the pistons transmit power to cam rollers.When the hydraulic power work on piston, the cam roller will transmit the power to the bevel of cam ring. Because the cam ring is connected with casing body, so that it makes torque.In such case, cam roller will transmit reacting force to the piston in the oil cylinder and cause rotating. The torque is in proportion to system pressure. System’ s main oil pipe connect with oil mouth A and C which are on the connecting body. And the oil drain pipe connect with oil mouth D1, D2 and D3 which are on the casing body. XHAC motor connect with main shaft of equipment through the solid shaft in the oil cylinder. And torque is transmitted through locking plate or male/female spline connecting. The symmetric design makes XHAC motor is possible to be used as double displacement motor. It means the motor can run at two different speed with fixed flow rate. Just need to mount a special valve on the connecting position of oil inlet flange to change the displacement.
Outline Dimension Drawing:
Technical Specifications:
| Metric motor model | Full displacement | Max Pressure | Variable displacement | ||||||||
| Displacement | specific torque | Rated speed | Max. speed | Displacement | specific torque | Rated speed | Max. speed | Speed ratio | |||
| Vi cm³/rev | Ts NM/bar | n rev/min | n rev/min | P.bar | Vi cm³/rev | Ts NM/bar | n rev/min | n rev/min | n rev/min | ||
| XHCA 100-40 | 2512 | 40 | 390 | 400 | 350 | Do not recommend variable displacement application | |||||
| XHCA 100-50 | 3140 | 50 | 320 | 400 | 350 | ||||||
| XHCA 100-64 | 4021 | 64 | 260 | 390 | 350 | ||||||
| XHCA 100-80 | 5024 | 80 | 220 | 310 | 350 | 2512 | 40 | 220 | 310 | 1:2 | |
| XHCA 100 | 6280 | 100 | 190 | 270 | 350 | 3140 | 50 | 190 | 270 | 1:2 | |
| XHCA 140-80 | 5024 | 80 | 245 | 340 | 350 | Do not recommend variable displacement application | |||||
| XHCA 140-100 | 6280 | 100 | 205 | 275 | 350 | 3140 | 50 | 205 | 275 | 1:2 | |
| XHCA 140-120 | 7543 | 120 | 180 | 245 | 350 | 3771 | 60 | 180 | 245 | 1:2 | |
| XHCA 140 | 8800 | 140 | 170 | 220 | 350 | 4400 | 70 | 170 | 220 | 1:2 | |
| XHCA 210-160 | 10051 | 160 | 105 | 150 | 350 | 5026 | 80 | 105 | 150 | 1:2 | |
| XHCA 210-180 | 11314 | 180 | 100 | 135 | 350 | 5657 | 90 | 100 | 135 | 1:2 | |
| XHCA210 | 13200 | 210 | 85 | 115 | 350 | 6600 | 105 | 85 | 115 | 1:2 | |
When XHAC motor is in brake condition, the backpressure should be 12bar.When speed is bigger than rated speed, we must consider carefully about the selection of backpressure, cooling and hydraulic system. 4 oil inlets is necessary for high speed.
XHAC hydraulic motor is designed as per standard of DNV ship classification society and allowed testing pressure is 420bar. Instantaneous pressure of 420bar is allowed to occur 10000 times.When rotating speed over 280rpm, motor must be sealed by fluorine rubber. For continuous working, the maximum pressure for the casing is 2bar.
Profile Chart Of XHCA Motor:
Available Models：
The series includes three high-capacity models tailored for large-scale marine and industrial drives:
1.XHCA100: Built for substantial torque requirements, offering exceptional displacement and reliability for main propulsion and heavy winch systems.
2.XHCA140: Delivers increased power density and higher torque output, making it ideal for massive offshore cranes and mooring systems.
3.XHCA210: The flagship model, engineered for the most extreme heavy-duty applications, providing maximum torque and stability under the highest pressures.
These motors are widely used in ship winches, windlasses, offshore drilling equipment, and heavy industrial machinery where absolute reliability is non-negotiable.