Our bearings are used on various vessels such as cargo
boats, ferry boat, tug boats, pusher boats, navy ships, fishing boats
with approvals from LR,ABs, BV,NV, CR, NK respectively.
Recently the demands for Rubber Bearings are increasing in place of
Lignum Vitae on account of a sharp rise in price and abnormal abrasion
of Lignum Vitae. Our bearings with quality rubber do not damage the
shaft sleeve and offer smooth rotation of the shaft over a long period
of time.
Rubber Bearings are used not only for propeller shaft but for cutter
shaft head of dredging vessels. Besides the above ,Rubber Bearings
are applied for vertical pump shafts.
|
 |
| Full
Molded Type |
|
Segmental
Type |
 |
|
 |
As figured, the rubber is
vulcanized onto the shell wall,
and the determined numbers of groove are provided,
along which the lubricating water goes through. |
|
This type is mostly applied
to rather big shafts. As figured, the determined numbers of strips
with rubber are set in the shell housing. |
•Small Coefficient
of Friction
•Superior Abrasion Resistance
•Long Life of Shaft Sleeve
•Less Power Required, Less Shock and Noise-Proof
•Less Maintenance Required
•Quality Stability
•No Possibility of Sea Contamination |
| Rubber Materials |
| |
Special compound Synthetic Rubber
(having superior abrasion resistance, water resistance and oil resistance) |
Shell Materials
|
| |
Shells of BC3 or YBSC 3 are used for our standard rubber bearings.
Besides the above, those of Stainless Steel or Aluminum are often
used for applied bearings on user’s request. |
| 1.
Full molded type (Straight and Flanged type) |
 |
| 2.
Segmental type |
 |
Strip
 |
Kind
of Strips
| Kind |
Width
E(W1) |
Height
H |
Base Plate
h2 |
Width
of Groove
W2 |
| S-1 |
42.67 |
17.40 |
9 |
42.86 |
| S-2 |
45.85 |
17.40 |
9 |
46.04 |
| S-3 |
49.02 |
19.00 |
10.5 |
49.21 |
| S-4 |
52.20 |
19.00 |
10.5 |
52.39 |
| S-5 |
55.37 |
19.00 |
10.5 |
55.56 |
| S-6 |
58.55 |
19.00 |
10.5 |
58.74 |
| S-7 |
69.67 |
22.15 |
12 |
69.85 |
| S-8 |
74.42 |
22.15 |
12 |
74.61 |
| S-9 |
77.60 |
25.30 |
13.5 |
77.79 |
| S-10 |
80.77 |
25.30 |
13.5 |
80.96 |
|
|
| Clearance at the time of assembly |
| |
The followings are considered to be adequate in our
experiences. |
| |
| Shaft (Sleeve) Dia. |
Clearance |
| ø50~100 |
0.30~0.50mm |
| ø100~150 |
0.40~0.70mm |
| ø150~175 |
0.50~0.85mm |
| ø180~245 |
0.60~1.15mm |
| ø250~265 |
0.70~1.30mm |
| ø270~315 |
0.80~1.35mm |
| ø320~355 |
0.90~1.45mm |
| ø360~405 |
1.00~1.55mm |
| ø410~445 |
1.10~1.65mm |
| ø450~495 |
1.10~1.80mm |
| ø500~ |
1.20~2.00mm |
|
| Replacement |
| |
The bearing shall be replaced when the clearance goes
over the following figure. |
| |
| Shaft (Sleeve) Dia. |
Max. Clearance |
Remarks:
The figures showed in the left table mean only guide-post for
replacement.
Max. clearance for replacement should be decided, considering
bending stress loaded on propeller shaft. |
| ø15~50 |
2.5mm |
| ø50~150 |
4.5mm |
| ø150~230 |
6.0mm |
| ø230~300 |
8.0mm |
| ø300~ |
9.5mm |
|
1. |
The shaft must never be operated without water.
|
| 2. |
The clearance shown in the above list is to be considered for the
application at normal temperature of water. When the water temperature
reads more than 30°C, it is recommendable to have a little bigger
clearance.
|
| 3. |
When inserting the shaft into our rubber bearings, any grease or
oil must not be used. Soapy water is recommendable for the purpose.
|
| 4. |
Our rubber bearings should not be left near any heat, especially
in direct sunshine for a long period of time. |
| (1) Maximum Load onto Rubber Bearings |
 |
The maximum load in consideration of economical efficiency is 2.5
kgf/cm²
and, it is recommendable to use rubber bearings on the load between
1 to 1.5 kgf/cm². |
(2) Lubricating Water |
Standard water volume necessary for rubber bearing is calculated
on the following formula.
Shaft Dia. shown in centi-meter(cm)×3-3.5
liter per minute.
The above figure is considered to be enough for smooth rotation of
shaft under different conditions.
Although the shaft may operate smoothly in the water without pump
and pipe line, it is recommendable for rubber bearings to supply enough
water with adequate pressure through pipelines.
In case of cutter shaft bearing of dredging vessel, a lot of sands
or small stones are involved in the water and the required water volume
is calculated on the under mentioned formula.
Necessary water volume for cutter shaft bearings of dredger:
Shaft Dia. shown in centi-meter (cm) ×8-10 liter per minute. |
We are awaiting your inquiries. When making inquiries,
please specify the following points.
|
1. |
1. Inside diameter or rubber
bearing……A
|
 |
2. |
Outside diameter of shell
surface ……B |
3. |
Length………………………………..L |
4. |
In case of “With Flange”
Rubber bearing, please specify outside diameter and thickness of flange……………….D&E |
