Pneumatic | Swivel Units | Universal Swivel Unit
Universal unit for pneumatic swivel and turning movements.
Can be used in either clean or contaminated areas, anywhere where pneumatic swiveling is required.
Evenly divided series with a steady increase in torque for multiple applications is the correct size as a standard product available
Swivel angle can be selected as either 90° or 180°
Complete flexibility in selecting the swivel angle; special angles available on request
End position adjustability +3°/-3° (small) or +3°/-90°
(large) can be selected
Middle position can be pneumatic or locked the locked middle position can be unlocked when loaded. The two types of middle positions always allow further rotation in either direction.
Fluid feed-through can be used for gases, fluids and vacuum therefore no interfering hoses
Electrical rotary feed-through for long-lasting, reliable feed-through of sensor, actuator or optionally bus signals
Choice of electronic magnetic sensors or inductive proximity sensors for absolute variability of position monitoring
Replaceable screw-in guide sleeves (bushing) allow for easy maintenance and rapid replacement after several million cycles.
Series extends downwards with the SRU-mini series, for a wide range of applications
112
Sizes
Quantity: 10
Weight
1.2 .. 26.5 kg
Torque
3 .. 115 Nm
Repeat accuracy
0.05°
Angle of rotation
90 .. 180°

Pneumatic | Swivel Units | Universal Swivel Unit
When subjected to pressure, the two pneumatic pistons move their end faces in a straight line in their respective bores thus turning the pinion by means of the serrations on their sides.
1
2
Drive
Pinion
pneumatic, powerful double piston drive
3
Housing weight-optimized through the use of hard-anodized aluminum alloy stable pinion, optionally available with fluid feedthrough, for transforming the piston movement into a rotary movement
4 Sleeve technology for radial adjustment of the end positions without a settling effect and ensuring rapid replacement for maintenance
5
Damping
Hydraulic shock absorbers for high moments of inertia
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SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
Standard conditions: the technical data shown refers to an environment of 20 °C and atmospheric pressure.
Housing material: aluminum extruded section
Actuation: pneumatic, with filtered compressed air as per
DIN ISO 8573-1: 7 4 4
Operating Principle: double piston rack and pinion principle
Scope of delivery: flow control valves, centering bushings,
O-rings for direct connection, shoulder bolts (SRU-plus 63 only), assembly and operating manual with manufacturer’s declaration
Warranty: 24 months (details, general terms and conditions and operation manuals can be downloaded at www. schunk. com)
Repeat accuracy: is defined as a distribution of the end position for 100 consecutive cycles.
Pinion position: is always shown in the left end position.
The pinion rotates from here to the right in a clockwise direction. The arrow indicates the direction of rotation.
Pinion screw connection diagram: please note that when the angle of traverse is to be set for less than 90°, the left stop will generally be completely turned in. The left end position therefore has a screw connection diagram which has been rotated by 90° in the clockwise direction in relation to the drawing, which is shown at a 180° angle of rotation.
Special swivel angle: more swivel angles are available on request.
Torque in the end positions: note that the final angular degrees (approx. 2°) before the end position can only be approached using the force of a single drive piston. For this reason, double pressurized modules only have about half the rated torque available in this area. An external stop can be used to provide the full torque even in the end positions.
Rotation to the pneumatic middle position: is carried out using only half the nominal torque.
Cycle time: is the pure rotation time of the pinion / flange rotating about the nominal angle of rotation. Valve switching times, hose filling times, or PLC reaction times are not included, and have to be considered for determining the cycle times.
2 small parts.
1
O 2 O
114
2
N
3
2
2 N 2

The following components make the SRU-plus even more productive – the perfect complement for highest functionality, flexibility and process reliability.
SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
Centering Sleeves Fittings Magnetic Switch MMS Inductive Proximity Switches
Sensor Distributor Universal Gripper PGN-plus Sensor Cables Pressure Maintenance Valve
L
Universal Gripper PZN-plus Universal Angular gripper
PWG-plus
3-Finger Centric Gripper
DPZ-plus
Sealed Universal Gripper
DPG-plus
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For particularly high loads, additional external shock absorbers may be required. Please contact us for more information.
Thanks to the innovative sleeve technology, special rotation angles of greater than 180° can be provided quickly and economically. Please contact us for more information.
We are also happy to provide our electrical feed-throughs with M5 or M12 connections on request. On request the electrical feed-throughs can also be used to transmit bus signals.
Note that suitable emergency stop scenarios (e.g. controlled shut down) and restarting scenarios (e.g. pressure build-up valves, appropriate valve switching sequences) are needed for all pneumatic actuators.
Cutting off the pressure in an uncontrolled manner could lead to undefined states and behavior.
115

SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
Pneumatic Drive
Double actuation ʥ high torques despite small design
End Position Adjustment Range of the Two-position Units
1
3
0
-3
177
Start End position
180 position
183
Swivel range
Adjustment range of starting position
Adjustment range of end position
1
.
- /00 13 4 5 6 78 9 8 63 ; 7 9 - 1 / 4 : 3 9 ʥ range (±3°) for fine adjustment
8 n 180° units ʥ small end position adjustment range for fast and exact fine adjustment
2
0
-3
87 93 a rt
p os iti on
End p os iti o
180
183
Swivel range
Adjustment range of starting position
Adjustment range of end position
2 a / < = 1 13 4 5 6 78 9 8 63 / 4 : - 1 ; 7 9 3 9 range (+90°) for variable adjustʥ large flexible end position adjustment range for flexible adjustment of the angle of rotation
3
87
90
93
3
0
-3
End position
Start position
Swivel range
Adjustment range of the starting position
Adjustment range of the end position
3
.
- /00 13 4 5 6 78 9 8 63 ; 7 9 - 1 / 4 : 3 9 ʥ range (±3°) for fine adjustment
8 n 90° units
116

SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
ʥ Pneumatic center position for flexibility in the intermediate position ʥ Center position +/-3° adjustable for fast fine adjustment
ʥ Mechanically locked and hydraulically damped center position for short swivel times ʥ Center position +/-3° adjustable for fast fine adjustment
ʥ Hose-free fluid feed-through and large center bore save installation space ʥ Increased process reliability, since there are no moving hoses or cables
ʥ Completely integrated feed-through for sensor and actuator signals ʥ Connection via standard connectors
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SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
ʥ Electronic magnetic switch can be fully sunk in the groove to minimize the interfering contour ʥ Up to three positions can be monitored
ʥ Inductive proximity switches in M8 version for fast mounting with the mounting kit ʥ Reliable monitoring of up to three positions
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SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
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We would be glad to assist you with your selection.
SCHUNK Technical Hotline +49-7133-103-2696
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SRU-plus
Pneumatic | Swivel Units | Universal Swivel Unit
Sample Order
SRU-plus 20 - S - 180 - 3 - M - 4 - M8 - AS z{| } € ~ } ‚
SRU-plus
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20 / 25 / 30 / 35 / 40 / 50 / 60 / 63 z € …† } ~ … { ‡ ‚ ˆ
S = Speed (for size 20)
W = Soft
H = Hard (for high payload)
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90° / 180°
  ˆ † ‚ | ition adjustment range
3° / 90°
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- = none
M = Center position pneumatic
VM = Center position locked
Number of fluid feed-throughs
- = no fluid feed-through
4 = for sizes 20 – 35
8 = for sizes 40 – 63
Plug size for electric feed-through
- = no electric feed-through
M5 = M5 plug on the rotating side
M8 = M8 plug on the rotating side
M12 = M12 plug on the rotating side
Mounting kit for inductive proximity switches
- = no mounting kit
AS = with mounting kit
Torque Graduation
120
100
80
60
40
20
0
SRU-plus 20 SRU-plus 25 SRU-plus 30 SRU-plus 35 SRU-plus 40 SRU-plus 50 SRU-plus 60 SRU-plus 63
121