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SYDFED-2X, SYDFED-3X, SYHDFED-1X | Product description
Keyed shaft
Splined shaft
Bosch Rexroth AG, Edition 11.2021, RE 30017-B
5.7
SHAFT VARIANT
The SY(H)DFED control system is available with keyed or splined shafts. 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 is advantageous 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.
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.
Splined shaft profiles depend on the size (NG) of the pump. Two different splined
shaft profiles are therefore available in conjunction with SY(H)DFEx:
• "S"-profile for NG18, NG100 and NG140
• "R"-profile for NG28 ... 71
When compared with the "S"-profile, the "R"-profile features further improved
properties with regard to the torque carrying capacity of the shaft. This version
represents the optimum for a wide variety of applications.
5.8
SPOOL VARIANTS OF PILOT VALVE VT-DFPD-X-1X
The standard spool according to the ordering code is spool type "A" (360° spool).
The 4-groove spool of type "C" is also allocated to SYHDFED as standard for
applications using HFC media.
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