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Table 3-4 Rolling-contact Bearing Variants - Siemens 1LA8 Operating & Installation Instructions Manual

Low-voltage motor simotics tn series n-compact.
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Description
Rolling-contact bearings
The machines are equipped with different types of rolling-contact bearings depending on the
version and the operating conditions described in the order. The different types are listed on
the lubricant plate of the machine. In converter operation an insulated bearing is usually
installed on the non-drive end. The following rolling-contact bearing variants are available:
Table 3-4
Version
Horizontal type of construction,
coupling output
Horizontal type of construction,
for increased transverse forces
e.g. in the case of belt coupling
Vertical type of construction,
shaft height 315, coupling output
Vertical type of construction,
shaft height 355 ... 450
Rolling-contact bearing design for "Increased degree of protection" (option)
Improved sealing of the bearing units to prevent dust and water from getting in can be achieved
by positioning a grease chamber ahead of the actual bearing unit. Although the same grease
is used in both cases for reasons of convenience, a distinction is made here between
"lubricating grease" and "sealing grease" because of their different functions.
Layout
The spent lubricating grease collects in the space between the bearing housing and the outer
bearing cap. The latter also forms the sealing grease chamber with the labyrinth sealing ring
(optional). The second lubricating nipple containing the grease duct for pressing in the sealing
grease is also located in the outer bearing cap. The chamber is sealed off from the space
where the lubricating grease collects by a V-ring or a V-ring and felt ring combination which
prevents the sealing grease in the chamber from penetrating into the lubricating grease
collecting space. During operation, the sealing grease in the chamber slowly runs out via the
labyrinth and seals it, additionally removing dust from inside and around the outside of the
labyrinth ring.
Terminal box
The terminal box can be arranged either on the left or right of the machine. It is not possible
to change the position to the other side of the machine at a later date.
28
Rolling-contact bearing variants
Rolling-contact bearing
● Drive end: Deep-groove ball bearing as a fixed bearing
● Non-drive end: Deep-groove ball bearing as a floating bearing
● Drive end: Cylindrical-roller bearing as a floating bearing
● Non-drive end: Deep-groove ball bearing as a fixed bearing
● Drive end: Deep-groove ball bearing as a fixed bearing
● Non-drive end: Deep-groove ball bearing as a floating bearing
● Drive end: Pairing of angular-contact ball bearing / deep-groove
● Non-drive end: Deep-groove ball bearing as a floating bearing
with axial compression springs
with axial compression springs
ball bearing as a fixed bearing
with axial compression springs
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 08/2017

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