renk sn

8/14/2019 RENK SN

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INSTRUCTIONS

for installation maintenance and operation

PROPELLER SHAFT BEARINGS TYPE SN

Types and coding

Heat dissipation by means of 1

Type S propeller shaft bearihg

Se r i e s N standard design

N natural ,cool ing

W = water coo l ing

Z oil circulation with extomsl

cooling

U circulating pump

T :::I circulating pump with weter

cooled oil sump

Afte rmost o r in te rmed ia te l T

Learing

aftermost bearing

intermediate bearing WEAK

{AENK HANNOVER•

data plate

S N N T 36-350

2 9822

I I

6

- JH , - - -8

7

e

1514 17

\

6 20-

\

Aftermost bearing T Intermediate bearing L

Figure 1

Introduction

The SN Type bea ri ng can be suppl led as an af te r -

most bearing 360° bearing shel l) or as intermediate

bearing 180° bearing shel l .

Fur Iy assembled bear ings should be handled using the

In tegra l ly cast transport hooks on th e lower part of

the bearing.

Despatch

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Install the bearing so tha t the 11 ring (5 ) is located

at th e bow end in th e ca se of hori zontal sha ft s or

shafts Inclined to the stern, an d at t he s te rn en d in

t he c as e of shaf ts i nc l i ne d' t o t he bow.

The oil ring should be f it ted to the shaft as follows

(Figure 2) :

Having inserted springs (6 ) an d pressure pads (7 )

(with their heads towards the shaft) into the reces-

se s of a half oil ring i t w ill be slipped under the

s ha ft t o permit assembly of the second half r ing.

Joints ar e 1 igned b y m ea ns of locating pins. 80th

r in g h al ve s ar e t ightly connected by means of

screws 8 ).

Figure4

FI inger seal s provide a s ea l w he re shafts emerge

from housing 4 ) . A fl i nger made f rom ni tr i le rub-

be r i s f it ted to the shaft and runs inside a chamber

having openings towards the interior of th e bearing.

The fl inger is suppl le d cu t to approximate size.

Duri ng assembl y it should be w ra pp ed a ro un d th e

shaft an d accurately cu t to lenght to ensure a close

butt jo int . The ends shou'ld be joined by using a

cyanoacrylate g lue ( ins tan t glue) , preferrably.

Th e f l inger is held in place on the shaft by a garter

spring 10 .

15

Figure 2

Th e oil ring i s a xi al ly e dju sta ble o n th e shaft, an d

It s f inal posit ion 2 mm from the bearing shell -

can therefore be se t a l a ter s tage.

The lower part of the housing 1 is roughly located

in it s f inal posit ion. Prior to f i t t ing the bottom

s he ll ( 3 ) the spherical surface should be coated withlubricat ing oi l . After inserting the shell the running

s u ~ f c e shou ld a lso be lubricated.

The axial c learance with in the seal i ng hous ing ca n

accomodate norma l sha ft elongation. The distance

between f l inger an d the walls must be such t ha t t he

f l inger d oe s n ot to uc h t he wal ls during expansion of

the shaft.

After f i t t ing the upper housing (2 ) tapered pins (or,

i n t hecese of smal le r sizes, parallel pins) 11 ar einserted and bolts 1 2 are f i rmly t ightened cross-

wise.

The shaft (22) c an n ow be in se rt ed . I f the clearance

between shaft and shell is abt. 0 .5 mm, th e bottom

h ou si ng s ho ul d be accuratel y a li gned (Figu re 3 ).

Check by measuring the ga p between the sha f t an d

th e lateral bore. Dim ensions h an d v should

be almost identical. The more accurate th e al ign-

ment the more eff icient wil l be the f linger sea l.

The oil scraper (13) must be f reely movab le. It

must ne ither ja m no r rest on th e oil ring . Its height

should be adjusted by means of th e nu t (14) In such

a wa y so that it s d istance f rom th e oil ring amounts

to about 0.1 to 0 .5 m m (Figure 2 and Figure In -

t ~ r m e d l t ebearing ) . In t he case of bearings Size

SN 7 an d u pw ar ds t he sc ra pe r is mounted on a

h inge (Figu re 5 and Figure Aftermost bearing ) .

In this case the'adjustment is ca rr ied ou t by means

of the s cr ew ( 23 ) w hic h is afterwards secured by

the nu t (24). The oil drainer li p (15) always to

face the shel l .

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Oil f i l l ing

Fo r normal operat ion condi t ions e; branded mineral

oil with l ow foam ing tendency s ho ul d b e used. It s

viscosity will depend on shaft d iameter an d speed.

Relevant data Bre g iv en in th T ab le o n page 4. If I

due to spec ial opera ting condit ions, a certain type

o f oil is speci f ied inour acknowledgemwnt of order,

It is imperative that this be used. Damage ma y

occur if oi ls of a di f ferent viscosi ty ar e used

Please consul t us if in doubt

Oi l f i l l ing m u st o n ly be carried ou t with th e shaft

stat ionary. After removing th e li d 1 7 on to p of

th e housing, an d f i l l the bearing with up to the

centre between th e markings (Figure 6 . Avoid an y

t op pi ng u p d ur in g running so as to avoid overf i l l ing

an d leaking.

Water cool ing

The SNW Type bearings are equipped with a sea-

waterres is tant cool ing s){stem. The f inned tubes

(·18) are interconnected. The system should be

connected to the pipe sockets 19) . control

valve s ho ul d b e p ro vid ed in the i nl et p ip e, an d th e

wate r shou ld be al lowed to drain away by graVity.

The d irect ion o f f low is opt ional .

The cool ing water velocity should not exceed

1 ,Sm/s .

Starting up

The temperatu re o f the ru nni ng surface must not

exceed 90°C. Any alarm devices should be se t ac-

co rdi ngl y ; t he ir sensors ca n be f it ted to th e thermo-

meter bores 20 .

Angle oil level gauge

me><

norm.

min . (operation)

Figure

Oil s igh t g l assIf the temperature of 90°C is exceeded, the m a-

chine should be stopped immediately and th e cause

fo r th e temperature rise investigated.

The f i rst oi I change with subsequent r insing should

be carried o ut a ft er an in i t ia l running period of about

weeks. Further oil changes a re r ec om m en de d a t

i n te rva l s o f .8000 operat ing hours.

It i s a d vi sa b le to keep the outside of th e bearing

housings clean so that heat radiation isnot impaired

by d e po si ts o f d us t or dirt .

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