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INQUIRIES C-Series T-Series Rotary Vane Type S/G Piston Type
YDFT-1000-4
● System configuration and Functions.
1. In both the 1-ram 2-cylinder and the 2-ram 4-cylinder types, the rudder actuator has a total capacity (torque) to be equivalent to the 100% of design capacity and the power system is completely doubled. 2. When a single failure, such as the oil leakage, occurs in the piping system, the low oil level detector of the oil tank to be connected to the power system in operation is actuated to send an alarm to the bridge and engine room. The valve adjustment of A~F on the next page diagram is then done manually in the steering gear room in order to isolate the malfunctioning hydraulic system. Thus maintaining stable operation of the power system. In this manner, steering capacity is maintained. 3. It is satisfies the IMO regulation for the tankers of 10000 GT or more, that the valves A and B Change to the automatic isolation valves. In that case, when a single failure, such as the oil leakage, occurs in the piping system, by the low oil level detector of the oil tank to be connected to the power system in operation, the other power system is simultaneously operated automatically or remotely. At the same time, the circuit isolation valves between the circuits actuate to isolate the malfunctioning piping system automatically. Thus, the steering capability is maintained. And the power system on the malfunctioning piping system is stoped automatically by the second low level detector, At the same time, the related isolation valve also returns to its original position. 4. Alter the single failure to be described above, the capacity of rudder actuator is reduced to the half of design capacity. It is necessary to reduce ship's speed to the half of max. speed or below 7 knots.
● Features
	1. Excellent Response and Energy-Saving The torque motor system enables the steering gear to respond more accurately and more quickly to the steering command from steering stand than the hitherto-employed mechanical link system, especially, in fine rudder angle. The pay off : into propensity of the ship meandering, hence no waste of precious fuel. 2. Simple Construction and Compact Design Pump the discharge is controlled electrically by the torque motor. Without the auto-pilot receiver and mechanical link of the conventional system, the new system is simple in construction and compact in design. 3. High Reliability The torque motor employed is the brushless, gearless type and a D,C motor with to rubbing parts. Non-follow-up steering by-passing the amplifier can be preformed from the bridge. The hydraulic system remains identical to that of the conventional steering gear of proven design, with mechanical feedback links.
4. Greater Freedom of Arrangement
It is devoid of the auto-pilot receiver and mechanical link hitherto to be required in this system, the arrangement of pump units can make with a greater degree of freedom, besides the ease of outfitting on board.
5. Ease of Control in Emergency Steering
Emergency steering can be performed with the mechanical handle on the servo mechanism on the pump, with only limited physical effort.
6. No-Load Motor Start-up
Since the motor of the hydraulic pump can be started in the no-load condition, the emergency generator can be designed just that much smaller in capacity.
7. Complete Dual Control System
The complete control system is demanded from the rule of ABS and other classification societies to be satisfied the limit of specification for the standard design.
● Operation
■ Bridge Remote Control
The rudder angle electric command signal issued from the steering stand is amplified by the amplifier (A) and transmitted to the torque motor (TM). The torque motor then drives the hydraulic pump control mechanical servo (MS) only as much as is directed by the command signal so that the tilting plate of the hydraulic pump (P) will be inclined accordingly for discharge of the required quantity of working oil. The working oil pressure thereby exerted causes the rudder to turn, and with feedback signal form the rudder tiller transmitted from the feedback detector (FB) to the steering stand signalling the rudder reaching the angle directed by the command signal the torque motor drives the mechanical servo back to the neutral position (0 deg). Consequently the hydraulic pump tilting plate also will return to the uninclined neutral position where the oil suction and discharge no longer take place, and the rudder therefore will be held at the angle to which it has been turned.
■ Local Control by the means of Mechanical Handle
In the local ‘HAND' control mode, it is not by the electric command signal but by direct manipulation of the mechanical handle on the hydraulic pump control mechanical servo that the hydraulic pump discharge is controlled. Since it is non-follow-up steering in this instance, releasing the mechanical handle upon turning the rudder to the desired angle will cause the mechanics servo centering function to automatically bring the hydraulic pump tilting plate back to the neutral positron so that the rudder will be kept at the desired angle,
● SFT-Type
■ Specifications & Dimensions
Type 　 SFC-30 SFC-40 SFC-60 SFC-80 SFC-125 SFC-170 　 Torque at maximum working pressure t-m 32 45 53 63 72 86 105 122 143 176 KN-m 314 441 520 618 706 844 1030 1196 1402 1726 Rudder turming speed deg/sec 65/28 　 Normal tiller radius mm 470 520 580 　 650 　 730 　 850 　 Diameter of ram (ф)mm 170 195 220 　 240 　 270 　 300 　 Maximum working oil pressure kgf/㎠ 220 220 180 215 185 220 190 220 180 220 Mpa 2106 21.6 17.6 21.1 18.1 21.6 18.6 21.6 17.6 21.6 Safety valve pressure (Design pressure) kgf/㎠ 275 275 225 269 232 275 238 275 225 275 Mpa 27.0 27.0 22.1 26.4 22.7 27.0 23.3 27.0 22.1 27.0 With main stand -by pump motor Output x Number Kw 11x2 15x2 15x2 19x2 22x2 25x2 30x2 37x2 45x2 50x2 Number of revolations rpm 1,800 　 Overload %/sec 100/60 　 Pump Type x Number 06V-FH2MK x 2 1V-FH2MK x 2 Without stand -by pump motor Output x Number Kw 7.5x2 11x2 11x2 15x2 15x2 19x2 22x2 25x2 Number of revolations rpm 1200 1800 Overload %/sec 100/60 Pump Type x Number 06V-FH2MK x 2 　 Dimensions mm A 2026 2220 2395 2600 2900 3235 B 2025 2185 2360 2565 2865 3200 C 470 520 580 650 730 850 D 740 815 910 1015 1140 1315 E 760 760 760 760 910 910 F 190 205 220 240 260 285 G 1243 1253 1265 1283 1420 1440
Note : The above list is complied for the turning angle of rudder, ±35 deg, and the electric source is the 60Hz.            This steering gear have the special particulars by the high workmanshop design.
● DFT-Type
■ Specifications & Dimensions
Type 　 DFT-60 DFT-80 DFT-125 DFT-170 　 Torque at maximum working pressure t-m 52 62 74 91 105 126 140 172 KN-m 510 608 726 892 1030 1236 1373 1687 Rudder turming speed deg/sec 65/28 Normal tiller radius mm 470 520 580 650 Maximum working oil pressure kgf/㎠ 185 220 180 220 180 215 180 220 Mpa 18.1 21.6 17.7 21.6 17.7 21.1 17.7 21.6 Safety valve pressure (Design pressure) kgf/㎠ 232 275 225 275 225 269 225 275 Mpa 22.7 27.0 22.2 27.0 22.2 26.4 22.2 27.0 With main stand -by pump motor Output x Number Kw 15 x 2 18.5 x 2 22 x 2 25 x 2 30 x 2 37 x 2 45 x 2 50 x 2 Number of revolations rpm 1,800 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 06V-FH2B-MK x 2 1V-FH2B-MK x 2 Without stand -by pump motor Output x Number Kw 11x2 11 x 2 15 x 2 15 x 2 19 x 2 22 x 2 25 x 2 Number of revolations rpm 1,800 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 06V-FH2B-MK x 2 　 Dimensions mm A 1826 1931 2164 2344 B 1678 1838 2011 2213 C 470 520 580 650 D 973 1023 1083 1153 E 1460 1510 1585 1660 F 190 205 220 240 G 1240 1250 1265 1280
Note : The above list is complied for the turning angle of rudder, ±35 deg, and the electric source is the 60Hz.            This steering gear have the special particulars by the high workmanshop design.
■ Specifications & Dimensions
Type 　 DFT-200 DFT-250 DFT-300 DFT-335 　 Torque at maximum working pressure t-m 207 244 291 351 KN-m 2030 2393 2854 3442 Rudder turming speed deg/sec 65/28 Normal tiller radius mm 715 730 780 850 Maximum working oil pressure kgf/㎠ 220 220 220 220 Mpa 21.6 21.6 21.6 21.6 Safety valve pressure (Design pressure) kgf/㎠ 275 275 275 275 Mpa 27.0 27.0 27.0 27.0 With main stand -by pump motor Output x Number Kw 55 x 2 75 x 2 80 x 2 90 x 2 Number of revolations rpm 1,200 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 3V-FH2B-MK x 2 Without stand -by pump motor Output x Number Kw 30 x 2 37 x 2 45 x 2 50 x 2 Number of revolations rpm 1,800 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 06V-FH2B-MK x 2 1V-FH2B-MK x 2 　 Dimensions mm A 2533 2740 2988 3100 B 2386 2505 2655 2842 C 715 730 780 850 D 1320 1335 1384 1454 E 1872 1887 1937 2007 F 255 260 275 285 G 1280 1295 1305 1315
Note : The above list is complied for the turning angle of rudder, ±35 deg, and the electric source is the 60Hz.            This steering gear have the special particulars by the high workmanshop design.
■ Specifications & Dimensions
Type 　 DFT-400 DFT-475 DFT-530 　 Torque at maximum working pressure t-m 363 400 440 485 560 KN-m 3560 3923 4315 4756 5492 Rudder turming speed deg/sec 65/28 Normal tiller radius mm 900 940 970 Maximum working oil pressure kgf/㎠ 195 215 200 220 220 Mpa 19.1 21.1 19.6 21.6 21.6 Safety valve pressure (Design pressure) kgf/㎠ 244 269 250 275 275 Mpa 23.9 26.4 24.5 27.0 27.0 With main stand -by pump motor Output x Number Kw 110 x 2 110 x 2 132 x 2 150 x 2 160 x 2 Number of revolations rpm 1,200 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 6V-VH2B-MK x 2 Without stand -by pump motor Output x Number Kw 50 x 2 55 x 2 63 x 2 75 x 2 75 x 2 Number of revolations rpm 1,200 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 3V-FH2B-MK x 2 　 Dimensions mm A 3176 3455 3595 B 3155 3205 3255 C 900 940 970 D 1645 1685 1715 E 2060 2110 2160 F 260 275 285 G 1515 1520 1530
Note : The above list is complied for the turning angle of rudder, ±35 deg, and the electric source is the 60Hz.            This steering gear have the special particulars by the high workmanshop design.
■ Specifications & Dimensions
Type 　 DFT-660 DFT-680 DFT-760 DFT-870 DFT-1000 DFT-1250 　 Torque at maximum working pressure t-m 660 680 768 872 1002 1179 KN-m 6473 6669 7532 8552 9827 11562 Rudder turming speed deg/sec 65/28 Normal tiller radius mm 1050 1050 1100 1130 1180 1240 Maximum working oil pressure kgf/㎠ 220 220 220 220 220 220 Mpa 21.6 21.6 21.6 21.6 21.6 21.6 Safety valve pressure (Design pressure) kgf/㎠ 275 275 275 275 275 275 Mpa 27 27 27 27 27 27 With main stand -by pump motor Output x Number Kw 90 x 4 90 x 4 110 x 4 125 x 4 150 x 4 160 x 4 Number of revolations rpm 1,200 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 3V-FH2B-MK x 4 6V-FH2B-MK x 4 Without stand -by pump motor Output x Number Kw 90 x 2 90 x 2 110 x 2 125 x 2 150 x 2 160 x 2 Number of revolations rpm 1,200 Overload 25% - Continuous, 100% - 1 Hour, 200% - 60 sec Pump Type x Number 3V-FH2B-MK x 2 6V-FH2B-MK x 2 　 Dimensions mm A 3504 3504 3658 3724 3872 4123 B 3504 3504 3890 3717 4040 4170 C 1050 1050 1100 1130 1180 1240 D 2242 2242 2449 2479 2529 2589 E 2242 2242 2449 2479 2529 2589 F 325 325 335 345 355 420 G 1490 1490 1620 1620 1620 1645
Note : The above list is complied for the turning angle of rudder, ±35 deg, and the electric source is the 60Hz.            This steering gear have the special particulars by the high workmanshop design.