Gear and rack swing hydraulic cylinder

Photo of Gear and rack swing hydraulic cylinder Gear-Rack Rotary Hydraulic ActuatorOverviewA gear-rack rotary hydraulic actuator converts hydraulic energy into oscillating or angular motion. The linear reciprocating motion of the hydraulic cylin...

Introduction
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Introduction

Photo of Gear and rack swing hydraulic cylinder

Gear-Rack Rotary Hydraulic Actuator

Overview
A gear-rack rotary hydraulic actuator converts hydraulic energy into oscillating or angular motion. The linear reciprocating motion of the hydraulic cylinder drives the rack, which engages with the pinion gear to generate bidirectional rotation. The cylinder force is mechanically amplified into torque through the rack-and-pinion transmission, and the swing angle is proportional to the rack stroke, achieving 0°–720° rotation.
The actuator consists of a pinion shaft, rack piston, cylinder body, and sealing system. Common mounting types include flange and foot mounting. Structural types include single-rack and double-rack designs, available in multiple series and sizes to meet different torque requirements. End-of-stroke cushioning (approx. 15° per end) ensures smooth operation.

Key Performance Advantages
1. High Torque Output
Torque is proportional to working pressure, and with the mechanical amplification of the rack-and-pinion system, the actuator can deliver up to 1,150,000 Nm (e.g., UBZ320). Suitable for heavy-duty industrial applications.

2. Precision Control
With optional rotary encoders or displacement sensors, the actuator forms a closed-loop servo system:

・Backlash ≤ 10 arc-minutes

・Position repeatability ≤ 0.05°

Ideal for automation and high-precision positioning.

3. Compact Design & Easy Maintenance
Optional integrated hydraulic power pack allows plug-and-play installation, remote control, and PLC/PC operation.

Applications
Steel & Metallurgy

・Ladle tilting
・Wire-rod mill swing arms
・Coil flippers and turnover machinery

Marine & Energy
・Naval fin stabilizers
・Steering mechanisms
・Subsea valve actuators (up to 2300 m depth)

Special Equipment
・Torque loading test rigs
・Sweeper truck tilting mechanisms
・Garbage compactor drives

Automation
・Rotary indexing tables
・Robotic rotary joints
・Automated production lines

UB Series Gear-Rack Rotary Actuator
UB series actuators are independently developed by URANUS Hydraulic Machinery and adopted as JB/ZQ4713-98 national heavy-machinery standard. We have delivered tens of thousands of UB actuators worldwide.

Features
・Mounting: Flange / Foot
・Structure: Single-rack / Double-rack
・8 series × 10 bore sizes × 10 models
・Rated pressure: 16 MPa / 25 MPa / 31.5 MPa
・Low starting pressure (≤1.5 MPa), high efficiency
・Wide temperature range −50°C to +260°C
・Excellent sealing & long service life

Fluid Compatibility
Works with mineral oil, emulsion, water-glycol, phosphate ester, etc. (Specify when ordering.)

Maintenance
Generally maintenance-free. Annual lubrication recommended. If minor leakage occurs, return oil to the tank; replace seals only when torque no longer meets requirements.

Hydraulic Power Pack Option
Ideal for single-actuator systems:
・Factory-filled and pre-set relief valves
・Independent torque adjustment for CW/CCW directions
・Fully enclosed reservoir
・Not recommended for ambient temperature 80°C

Custom Designs Available
We offer customized solutions, including:
1.Servo rotary actuators (starting pressure <0.5 MPa, backlash ≤0.02, repeatability ≤0.05°)
2.Ultra-large torque (1,150,000 Nm) and micro-actuators (<1 kg)
3.Special outputs: dual-shaft, combined shaft/boring, spline shaft, spline bore
4.Special mounting: twin-clevis, single-side flange
5.Angle fine-adjustment mechanisms
6.Built-in check valves, counterbalance valves for single/double chamber

Product Examples:

1. Swing Hydraulic Cylinder UBJZS140-172°
- Bore : 140 mm
- Angle: 172°
- Mounting Method: Foot Bracket
- Type: Double Rack
- Output : Double Parallel Key Shaft
- Shaft Diameter: 145e8 mm
- End Cushioning Angle: 12°
- Torque: 40,996 Nm
- Rated Pressure: 16 MPa - Test Pressure: 21 MPa
- Working Fluid: Hydraulic Oil

gear and rack swing hydraulic cylinder-8
2. Electric Swing Cylinder UBFKD40-90°HP01
- Bore : 40 mm - Angle: 90° - Torque: 2,480 Nm
- Mounting Method: Flange - Type: Single Rack
- Output Method: 4 Parallel Key Bore φ50⁺⁰·⁰³ mm - End Cushioning Angle: 15°
- Hydraulic Power Pack
- Rated Pressure: 21 MPa - Rated Flow: 1.6 L/min - Motor Power: 0.75 kW, 380V AC

gear and rack swing hydraulic cylinder-9

3. DC Motor Gate Control System UBFKD100-95°+UP16X6BEG
- Bore : 100 mm - Angle: 95°- Mounting Method: Flange - Type: Single Rack
- Output : 2 Parallel Key Bore φ85H7 mm - Torque: 8,320 Nm - End Cushioning Angle: 15°
Hydraulic Power Pack
- Rated Pressure: 16 MPa - Rated Flow: 6 L/min - Motor Power: 2 kW, 48V DC
- Working Fluid: Hydraulic Oil

gear and rack swing hydraulic cylinder-10

4. Swing Cylinder for Forestry Crane UBTZSJ80-380°H
Bore : 80 mm Angle: 380° Mounting Method: Foot Bracket Type: Double Rack
Output Method: Flange Shaft
Rated Pressure: 19 MPa Test Pressure: 22 MPa Torque: 15,280 Nm Working Fluid: Hydraulic Oil

gear and rack swing hydraulic cylinder-11

Here are the product samples of the UB series and UBZ series

UB Series Rack-and-Pinion Hydraulic Rotary Actuator (JB/ZQ4713-2006)

Selection Example: Rotary actuator with flange connection, shaft output, double-rack, 8818 Nm
torque, 368° swing angle, end cushion, and P05 hydraulic power unit

gear and rack swing hydraulic cylinder-12
Basic Specifications Table for UB Series Rack-and-Pinion Hydraulic Rotary Actuator (JB/ZQ4713-2006)

Structure	Connection method	Model		Cylinder diameter (mm)	Output Torque (Nm) (P: Operating Pressure Mpa)	Output Torque at P=16 MPa (Nm)	Oil Volume per Degree of Rotation (L/°)	Swing Speed with Hydraulic Power Unit (°/s) (Non-cushion)
		Shaft Output	Hole Output					P01	P02	P03	P04	P05	P06	P07	P08	P09	P10	P11
Single-rack	Flange	UBFZD40	UBFKD40	40	55 (P-1.5)	798	0.00097	26	34	48	60	72	86	98	120	140	172	240
	Foot	UBJZD40	UBJKD40
	Flange	UBFZD50	UBFKD50	50	98 (P-1.5)	1421	0.00171	15	19	27	34	41	49	55	68	80	97	136
	Foot	UBJZD50	UBJKD50
	Flange	UBFZD63	UBFKD63	63	171 (P-1.5)	2480	0.00299	B	11	16	20	23	28	32	39	46	56	78
	Foot	UBJZD63	UBJKD63
	Flange	UBFZD80	UBFKD80	80	302 (P-1.4)	4409	0.00526	4.8	6	9	11	13	16	18	22	26	31	44
	Foot	UBJZD80	UBJKD80
	Flange	UBFZD100	UBFKD100	100	566 (P-1.3)	8320	0.00987	2.5	3	4.7	5.9	7	8.4	9.6	11	14	17	23
	Foot	UBJZD100	UBJKD100
	Flange	UBFZD125	UBFKD125	125	994 (P-1.3)	14612	0.01735	1.4	2	2.7	3.3	4	4.8	5.5	6.7	7.9	9.6	13
	Foot	UBJZD125	UBJKD125
	Flange	UBFZD140	UBFKD140	140	1385 (P-1.2)	20498	0.02418	1	1.4	1.9	2.4	2.9	3.4	3.9	4.8	5.6	6.9	9.6
	Foot	UBJZD140	UBJKD140
	Flange	UBFZD160	UBFKD160	160	2010 (P-1.2)	29748	0.03509	0.7	0.9	1.3	1.7	2	2.4	2.7	3.3	3.9	4.7	6.6
	Foot	UBJZD160	UBJKD160
	Flange	UBFZD180	UBFKD180	180	2748 (P-1.1)	40945	0.04797	0.5	0.7	1	1.2	1.5	1.7	2	2.4	2.8	3.5	4.9
	Foot	UBJZD180	UBJKD180
	Flange	UBFZD200	UBFKD200	200	3958 (P-1.0)	59370	0.06909	0.3	0.5	0.6	0.8	1	1.2	1.4	1.6	2	2.4	3.2
	Foot	UBJZD200	UBJKD200
Double-rack	Flange	UBFZS40	UBFKS40	40	110 (P-1.5)	1595	0.00193	13	17	24	30	36	43	49	60	70	81	120
	Foot	UBJZS40	UBJKS40
	Flange	UBFZS50	UBFKS50	50	196 (P-1.5)	2842	0.00343	7.5	9.5	14	17	20	24	23	34	40	49	68
	Foot	UBJZS50	UBJKS50
	Flange	UBFZS63	UBFKS63	63	342 (P-1.5)	4959	0.00598	4	5.5	8	10	12	14	16	19	23	28	39
	Foot	UBJZS63	UBJKS63
	Flange	UBFZS80	UBFKS80	80	604 (P-1.4)	8818	0.01053	2.4	3	4.5	5.5	6.5	8	9	11	13	16	22
	Foot	UBJZS80	UBJKS80
	Flange	UBFZS100	UBFKS100	100	1132 (P-1.3)	16640	0.01974	1.3	1.6	2.3	3	3.5	4.2	4.8	5.9	7	8.4	12
	Foot	UBJZS100	UBJKS100
	Flange	UBFZS125	UBFKS125	125	1988 (P-1.3)	29224	0.03470	0.7	1	1.3	1.7	2	2.4	2.7	3.8	3.9	4.8	6.7
	Foot	UBJZS125	UBJKS125
	Flange	UBFZS140	UBFKS140	140	2770 (P-1.2)	40996	0.04836	0.5	0.7	1	1.2	1.4	1.7	2	2.4	2.8	3.4	4.8
	Foot	UBJZS140	UBJKS140
	Flange	UBFZS160	UBFKS160	160	4020 (P-1.2)	59496	0.07018	0.3	0.5	0.7	0.8	1	1.2	1.3	1.6	1.9	2.3	3.3
	Foot	UBJZS160	UBJKS160
	Flange	UBFZS180	UBFKS180	180	5496 (P-1.1)	81890	0.09593	0.2	0.3	0.5	0.6	0.7	0.8	1	1.2	1.4	1.7	2.4
	Foot	UBJZS180	UBJKS180
	Flange	UBFZS200	UBFKS200	200	7916 (P-1.0)	118740	0.13817	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	1	1.2	1.6
	Foot	UBJZS200	UBJKS200
Hydraulic power unit motor power (kW) (380V 50Hz)								0.55	0.75	1.1	1.5	1.5	2	2	2.2	3	4	4

UBFZD Flange-Mounted, Shaft Output, Single-Rack Series Hydraulic Rotary Actuator

α: Swing angle, determined by the customer’s requirements (within the range 0° to 720°, with an angle tolerance of ±1°). For higher precision or angle fine-tuning, please specify when ordering.

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1	M2 × Hole Depth
UBFZD40	70	95	75	105	140	160	164	184	55	197	154	6	20	233+1.54α	79	M22×1.5	M12×20
UBFZD50	80	105	85	125	146	185	170	210	66	231	163	6	22	254+1.75α	90	M22×1.5	M12×20
UBFZD63	90	115	95	140	164	200	194	232	72	253	190	6	25	275+1.92α	100	M27×2	M16×25
UBFZD80	95	125	100	150	175	225	205	257	86	292	212	8	25	328+2.09α	105	M27×2	M16×25
UBFZD100	115	145	120	165	194	265	234	306	100	343	244	8	32	370+2.51α	129	M33×2	M20×30
UBFZD125	125	155	130	170	230	285	274	334	116	390	284	8	32	417+2.83α	139	M42×2	M24×35
UBFZD140	145	180	150	200	240	305	286	354	125	418	290	10	36	423+3.14α	161	M42×2	M24×35
UBFZD160	165	200	170	220	255	330	315	390	140	464	314	10	40	484+3.49α	183	M48×2	M30×45
UBFZD180	175	220	180	240	330	380	390	440	152	518	380	12	45	578+3.77α	195	M48×2	M30×45
UBFZD200	195	240	200	260	365	440	425	500	170	578	438	12	45	610+4.40α	215	M48×2	M30×45

Outline Drawing of Flange-Mounted, Shaft Output, Single-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

UBFZS Flange-Mounted, Shaft Output, Double-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1	M2 × Hole Depth
UBFZS40	70	95	75	105	140	160	164	184	110	210	154	6	20	233+1.54α	79	M22×1.5	M12×20
UBFZS50	80	105	85	125	146	185	170	210	132	252	163	6	22	254+1.75α	90	M22×1.5	M12×20
UBFZS63	90	115	95	140	164	200	194	232	144	274	190	6	25	275+1.92α	100	M27×2	M16×25
UBFZS80	95	125	100	150	175	225	205	257	172	327	212	8	25	328+2.09α	105	M27×2	M16×25
UBFZS100	115	145	120	165	194	265	234	306	200	380	244	8	32	370+2.51α	129	M33×2	M20×30
UBFZS125	125	155	130	170	230	285	274	334	232	446	284	8	32	417+2.83α	139	M42×2	M24×35
UBFZS140	145	180	150	200	240	305	286	354	250	482	290	10	36	423+3.14α	161	M42×2	M24×35
UBFZS160	165	200	170	220	255	330	315	390	280	538	314	10	40	484+3.49α	183	M48×2	M30×45
UBFZS180	175	220	180	240	330	380	390	440	304	596	380	12	45	578+3.77α	195	M48×2	M30×45
UBFZS200	195	240	200	260	365	440	425	500	340	656	438	12	45	610+4.40α	215	M48×2	M30×45

Outline Drawing of Flange-Mounted, Shaft Output, Double-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

UBFKD Flange-Mounted, Hole Output, Single-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1	M2 × Hole Depth
UBFKD40	50	95	75	105	140	160	164	184	55	197	154	6	14	233+1.54α	57.6	M22×1.5	M12×20
UBFKD50	60	105	85	125	146	185	170	210	66	231	163	6	18	254+1.75α	68.8	M22×1.5	M12×20
UBFKD63	65	115	95	140	164	200	194	232	72	253	190	6	18	275+1.92α	73.8	M27×2	M16×25
UBFKD80	70	125	100	150	175	225	205	257	86	292	212	8	20	328+2.09α	79.8	M27×2	M16×25
UBFKD100	85	145	120	165	194	265	234	306	100	343	244	8	22	370+2.51α	95.8	M33×2	M20×30
UBFKD125	90	155	130	170	230	285	274	334	116	390	284	8	25	417+2.83α	100.8	M42×2	M24×35
UBFKD140	105	180	150	200	240	305	286	354	125	418	290	10	28	423+3.14α	117.8	M42×2	M24×35
UBFKD160	120	200	170	220	255	330	315	390	140	464	314	10	32	484+3.49α	134.8	M48×2	M30×45
UBFKD180	125	220	180	240	330	380	390	440	152	518	380	12	32	578+3.77α	139.8	M48×2	M30×45
UBFKD200	140	240	200	260	365	440	425	500	170	578	438	12	36	610+4.40α	156.8	M48×2	M30×45

Outline Drawing of Flange-Mounted, Hole Output, Single-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

gear and rack swing hydraulic cylinder-18

UBFKS Flange-Mounted, Hole Output, Double-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1	M2 × Hole Depth
UBFKS40	50	95	75	105	140	160	164	184	110	210	154	6	14	233+1.54α	57.6	M22×1.5	M12×20
UBFKS50	60	105	85	125	146	185	170	210	132	252	163	6	18	254+1.75α	68.8	M22×1.5	M12×20
UBFKS63	65	115	95	140	164	200	194	232	144	274	190	6	18	275+1.92α	73.8	M27×2	M16×25
UBFKS80	70	125	100	150	175	225	205	257	172	327	212	8	20	328+2.09α	79.8	M27×2	M16×25
UBFKS100	85	145	120	165	194	265	234	306	200	380	244	8	22	370+2.51α	95.8	M33×2	M20×30
UBFKS125	90	155	130	170	230	285	274	334	232	446	284	8	25	417+2.83α	100.8	M42×2	M24×35
UBFKS140	105	180	150	200	240	305	286	354	250	482	290	10	28	423+3.14α	117.8	M42×2	M24×35
UBFKS160	120	200	170	220	255	330	315	390	280	538	314	10	32	484+3.49α	134.8	M48×2	M30×45
UBFKS180	125	220	180	240	330	380	390	440	304	596	380	12	32	578+3.77α	139.8	M48×2	M30×45
UBFKS200	140	240	200	260	365	440	425	500	340	656	438	12	36	610+4.40α	156.8	M48×2	M30×45

Outline Drawing of Flange-Mounted, Hole Output, Double-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

gear and rack swing hydraulic cylinder-20

UBJZD Foot-Mounted, Shaft Output, Single-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1
UBJZD40	70	13.5	75	105	140	160	110	25	55	188	154	6	20	233+1.54α	79	M22×1.5
UBJZD50	80	13.5	85	125	146	185	131	25	66	215	163	6	22	254+1.75α	90	M22×1.5
UBJZD63	90	17.5	95	140	164	200	142	35	72	236	190	6	25	275+1.92α	100	M27×2
UBJZD80	95	17.5	100	150	175	225	168	35	86	267	212	8	25	328+2.09α	105	M27×2
UBJZD100	115	22	120	165	194	265	195	35	100	306	244	8	32	370+2.51α	129	M33×2
UBJZD125	125	26	130	170	230	285	228	40	116	354	284	8	32	417+2.83α	139	M42×2
UBJZD140	145	26	150	200	240	305	246	40	125	377	290	10	36	423+3.14α	161	M42×2
UBJZD160	165	33	170	220	255	330	274	45	140	415	314	10	40	484+3.49α	183	M48×2
UBJZD180	175	33	180	240	330	380	303	45	152	475	380	12	45	578+3.77α	195	M48×2
UBJZD200	195	33	200	260	365	440	333	45	170	520	438	12	45	610+4.40α	215	M48×2

Outline Drawing of Foot-Mounted, Shaft Output, Single-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

UBJZS Foot-Mounted, Shaft Output, Double-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1
UBJZS40	70	13.5	75	105	140	160	110	25	110	215	154	6	20	233+1.54α	79	M22×1.5
UBJZS50	80	13.5	85	125	146	185	131	25	132	257	163	6	22	254+1.75α	90	M22×1.5
UBJZS63	90	17.5	95	140	164	200	142	35	144	279	190	6	25	275+1.92α	100	M27×2
UBJZS80	95	17.5	100	150	175	225	168	35	172	332	212	8	25	328+2.09α	105	M27×2
UBJZS100	115	22	120	165	194	265	195	35	200	385	244	8	32	370+2.51α	129	M33×2
UBJZS125	125	26	130	170	230	285	228	40	232	451	284	8	32	417+2.83α	139	M42×2
UBJZS140	145	26	150	200	240	305	246	40	250	487	290	10	36	423+3.14α	161	M42×2
UBJZS160	165	33	170	220	255	330	274	45	280	543	314	10	40	484+3.49α	183	M48×2
UBJZS180	175	33	180	240	330	380	303	45	304	601	380	12	45	578+3.77α	195	M48×2
UBJZS200	195	33	200	260	365	440	333	45	340	661	438	12	45	610+4.40α	215	M48×2

Outline Drawing of Foot-Mounted, Shaft Output, Double-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

UBJKD Foot-Mounted, Shaft Output, Double-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1
UBJKD40	50	13.5	75	105	140	160	110	25	55	188	154	6	14	233+1.54α	57.6	M22×1.5
UBJKD50	60	13.5	85	125	146	185	131	25	65	215	163	6	18	254+1.75α	68.8	M22×1.5
UBJKD63	65	17.5	95	140	164	200	142	35	72	236	190	6	18	275+1.92α	73.8	M27×2
UBJKD80	70	17.5	100	150	175	225	168	35	86	267	212	8	20	328+2.09α	79.8	M27×2
UBJKD100	85	22	120	165	194	265	195	35	100	306	244	8	22	370+2.51α	95.8	M33×2
UBJKD125	90	26	130	170	230	285	228	40	116	354	284	8	25	417+2.83α	100.8	M42×2
UBJKD140	105	26	150	200	240	305	246	40	125	377	290	10	28	423+3.14α	117.8	M42×2
UBJKD160	120	33	170	220	255	330	274	45	140	415	314	10	32	484+3.49α	134.8	M48×2
UBJKD180	125	33	180	240	330	380	303	45	152	475	380	12	32	578+3.77α	139.8	M48×2
UBJKD200	140	33	200	260	365	440	333	45	170	520	438	12	36	610+4.40α	156.8	M48×2

Outline Drawing of Foot-Mounted, Hole Output, Single-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

gear and rack swing hydraulic cylinder-26

UBJKS Foot-Mounted, Hole Output, Double-Rack Series Hydraulic Rotary Actuator

Model	Φ1	Φ2	Φ3	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	M1
UBJKS40	50	13.5	75	105	140	160	110	25	110	215	154	6	14	233+1.54α	57.6	M22×1.5
UBJKS50	60	13.5	85	125	146	185	131	25	132	257	163	6	18	254+1.75α	68.8	M22×1.5
UBJKS63	65	17.5	95	140	164	200	142	35	144	279	190	6	18	275+1.92α	73.8	M27×2
UBJKS80	70	17.5	100	150	175	225	168	35	172	332	212	8	20	328+2.09α	79.8	M27×2
UBJKS100	85	22	120	165	194	265	195	35	200	385	244	8	22	370+2.51α	95.8	M33×2
UBJKS125	90	26	130	170	230	285	228	40	232	451	284	8	25	417+2.83α	100.8	M42×2
UBJKS140	105	26	150	200	240	305	246	40	250	487	290	10	28	423+3.14α	117.8	M42×2
UBJKS160	120	33	170	220	255	330	274	45	280	543	314	10	32	484+3.49α	134.8	M48×2
UBJKS180	125	33	180	240	330	380	303	45	304	601	380	12	32	578+3.77α	139.8	M48×2
UBJKS200	140	33	200	260	365	440	333	45	340	661	438	12	36	610+4.40α	156.8	M48×2

Outline Drawing of Foot-Mounted, Hole Output, Double-Rack Series Hydraulic Rotary Actuator with Hydraulic Power Unit

UB Series Rack-and-Pinion Rotary Actuator Hydraulic Power Unit

I. Outline Drawing