Generation Of Noise In The Power Unit; Pulsation Damper; Shaft Variant - Bosch rexroth SYDFE1 2X Series Operating Instructions Manual

Product description | Pressure and flow control system SYDFE1 series 2X, 3X
The details given for the noise pressure level in the technical documentation refer
to measurements taken in an anechoic chamber. Influences of the surroundings
such as place of installation, general mechanical concept, piping, etc., are not
taken into account.
5.8.1

Generation of noise in the power unit

"Noise" is composed of various elements. The total result of "noise" is influenced
not only by air-borne noise, but also by structure- and fluid-borne noise.
As a result of unfavorable installation and piping conditions, the noise pressure
level of the complete system can be 5 to 10 dB(A) higher than the value of the
pump alone.
Noise can be reduced by taking, for example, the following measures:
• Low-noise tank
• Damping ring between pump and pump mounting bracket
• flexible pipe conduit
• Anti-vibration rails under the motor
• Installation of the pump at a sufficient distance to the tank wall
5.8.2

Pulsation damper

For some special applications, we recommend the use of a pulsation damper. Due
to the reduction of typical pump pressure pulsation, this has a positive effect on
the noise level of the hydraulic system as a whole.
Further information can be found in data sheet RE 50142.
5.9

SHAFT VARIANT

The SYDFE1 control system is available with keyed or splined shafts. When
compared with the keyed shaft, the splined shaft is not only advantageous with
regard to its degrees of freedom during assembly and operation, but also due to
its increased torque load carrying capacity and its stability under changing loads.
This increased torque load carrying capacity is useful in particular when pump
combinations are to be installed. In the case of multiple pumps, all built-on units
are fitted with splined shafts.
In view of the dynamic load carrying capacity and standardization, we recommend
the use of standard types with splined shafts. This offers advantages with regard
to availability and future spare parts requirements.
When a splined shaft is selected, a clamp coupling must be used for the
mechanical connection to the electric motor. Otherwise, frictional corrosion may
occur that leads to damage to the pump.
Notes on the transmission of permissible maximum torques can be found in the
data sheet.
Keyed shaft Due to the advantages of the splined shaft, keyed shafts are not recommended for
new applications. The keyed shaft is no longer used for applications with through-
drive.
If a single pump is to be used later as "end pump" in a multiple-pump system, a
splined shaft must be selected.
RE 30011-B, Edition 10.2021, Bosch Rexroth AG
29/96