46
Bosch Rexroth AG
| Tightening Technology
3 608 878 300
System 350
| 3 608 878 300/2019-03
3.4.3
Tightening spindles
The modular design of Rexroth's tightening spindles (Fig.
) allows for very exact adjustment to the
tightening job and the precision requirements. You can obtain the highest possible level of system
reliability by installing a redundant measurement transducer in the tightening spindle.
The tightening spindles are available in the sizes 2/3/4 and 5, depending on the torque requirements. The
correct selection of the size has to be implemented separately for each tightening job and is explained in
more detail in chapter
.
The following figure shows the design of a straight tightening spindle:
Fig. 3–11:
Modular tightening spindle design
Drive unit
EC motor (1)
The EC motor is maintenance-free and easy to install. Its compact exterior dimensions ensure short
tightening times and high dynamics.
Planetary gearbox (2)
The space-saving planetary gearbox converts the low motor torque into a high output drive torque and
thus obtains a high level of efficiency. The planetary gearbox is simply bolted to the EC motor. Several
gearboxes are available per series, for use in various applications.
Measurement
transducer (3)
The measurement transducer is designed as a contact-free, maintenance-free action transducer. The
measured values (e. g. torque, angle of turn, and gradient) are processed directly in the measurement
transducer. It is equipped with an integrated cycle counter and can also be used as a redundancy
transducer. The measurement data is digitally transferred from the measurement transducer to the
tightening controller via a standard bus system and is thus resistant to interference.
Output drive (4)
Numerous different output drives are available for various applications. You can choose between straight
output drive, offset output drive with integrated transducer, angle head, angle head with integrated
measurement transducer or feed output drive, among others.
The offset output drive with integrated measurement transducer and angle head with integrated
measurement transducer features torque measurement directly at the bolt and measured value transfer
without slip ring. Thus, the measured values are not influenced by fluctuations in efficiency.
Tightening spindle
connection cable (5)
The connection between servo amplifier and tightening spindle is implemented with a single cable. This
cable requires little wiring effort and is exceptionally sturdy, providing safety advantages for applications
in which the tightening spindle is in constant motion, e. g. in systems with robotic arms. A maximum
distance of up to 100 m can be safely bridged.
(1)
(2)
(3)
(4)
(5)
Summary of Contents for Rexroth Tightening System 350
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