Backstop - Siemens FLENDER B3 E Series Assembly And Operating Instructions Manual

Table 8: Variant description Taconite seal
Taconite
type variant
"E"
"F"
"F F"
"F H"
"F K"
The specified re­charging intervals must be observed (see section 10, "Maintenance
and repair") for re­charging the Taconite seals with grease.
5.8

Backstop

For certain requirements, the gear unit can be fitted with a mechanical backstop. This backstop permits
only the specified direction of rotation during the operation of the unit. The direction of rotation is marked
by a corresponding arrow on the input and output side of the gear unit.
The backstop is mounted oiltight on an adapter flange on the gear unit and integrated in its oil­circulation
system.
The backstop is fitted with centrifugally operated sprags. If the gear unit rotates in the prescribed direction,
the inner ring rotates with the sprag cage in the direction of shaft rotation, while the outer ring remains
stationary. From a specific speed up (disengagement speed) the sprags disengage from the outer ring.
In this operating condition the backstop operates wearfreely.
Fig. 19: Backstop
1 Outer ring
2 Inner ring
3 Cage with sprags
Application
All input shafts
with or without fan
Output shaft
Type S (solid shaft)
Type F (flanged shaft)
Output shaft
Type H (hollow shaft with parallel keyway)
Type K (hollow shaft with internal spline
to DIN 5480)
Type D (hollow shaft with shrink disk)
Output shaft
Type H (hollow shaft with parallel keyway)
Type K (hollow shaft with internal spline
to DIN 5480)
Output shaft
Type D (hollow shaft for shrink disk)
1
2
4
3
5
6
BA 5033 EN 03/2011
Re­chargeable labyrinth
Labyrinth re­chargeable on both sides,
incl. cowl to prevent contact on gear
side facing away from output
Labyrinth re­chargeable on output side;
dustproof cowl on opposite side
4 Shaft
5 Cover
6 Residual­oil drain
30 / 96
Remarks