|Title of Invention||
A THRUST BEARING
|Abstract||A thrust bearing having a rotating part and stationary metal part, characterised in that the rotating part comprises a nylon ring accommodated in, and adhesively bonded to, a gun metal housing.|
This invention relates to a thrust bearing, particularly, though not exclusively, for use in, submersible motors.
The thrust bearing is an important component of the submersible motor. Such thrust bearings are subjected to heavy hydraulic thrust loads and therefore have to be properly designed; otherwise excessive output of the motor will be dissipated in the friction of the thrust surfaces.
The thrust bearing consists of two parts, one a rotating part and the other a stationary part. The top rotating part will generally be a carbon or graphite disc and the bottom stationary part will consist of either tilting pads or integral pads segmented on the bottom stationary part. Thrust pads are either chromium steel or bronze or stainless steel. The stationary part is pivoted by a rocker arrangement for self-levelling and self-aligning. This permits thrust pads to properly contact the rotating thrust disc and permits even distribution of the thrust load on the pads.
Both the material of the thrust plate and the stationary bearing surface have to be very tough and hard to withstand the heavy thrust load, which depends on the hydraulic pressure transmitted by the pump. Since the availability of carbon is scarce and expensive, a solution to this problem was considered necessary. Hence this invention.
The thrust bearing, according to this invention, has a rotating part and a stationary metal part, characterised in that the rotating part comprises a nylon ring accommodated in, and adhesively bonded to, a gun metal housing.
This invention will now be described with reference to the
accompanying drawings which illustrate by way of example,
and not by way of limitation, one of possible embodiments of
Fig. 1 illustrating the nylon ring
Fig.2 illustrating the gun metal housing
Fig.3 illustrating the assembly of the nylon ring and gun metal
The thrust bearing proposed herein has a rotating part which is characterised in that it comprises a nylon ring R accommodated in, and adhesively bonded to, a gun metal housing H. The stationary part is selected from a well ground stainless steel member or gun metal member.
The inner surface of the gun metal housing, serving to seat the nylon ring, is grooved for better adhesive bonding. So also the surface of the nylon ring in contact with the inner surface of the gun metal housing is also grooved for the same reasons.
The nylon ring is preferably made by injection moulding from nylon resin of grade 70 G 33 GRA BK 350 with 33% fibreglass reinforcement, the injection moulding being carried out at a temperature of 265 to 295 degree C. The rings so obtained have very good physical properties and very high wear resistance.
The thrust bearing proposed herein is found to be friction free and better in use and operation than its known counterpart mentioned above. Apart from the proposed thrust bearing being superior in performance, it is also cost effective.
It will be appreciated from the foregoing that various other embodiments of this invention are possible without departing from the scope and ambit thereof.
1. A thrust bearing having a rotating pari: and a stationary
metal part, characterised in that the rotating part
comprises a nylon ring accommodated in, and
adhesively bonded to, a gun metal housing.
2. A thrust bearing as claimed in Claim 1 wherein the
stationary part is a well ground stainless steel member or
a gun metal member.
3. A thrust bearing as claimed in Claim 1 wherein the inner
surface of the gun metal housing, on which the nylon ring
is seated, is grooved.
4. A thrust bearing as claimed in Claim 2 wherein the
surface of the nylon ring in contact with the inner surface
of the gun metal housing is also grooved.
5. A thrust bearing as claimed in any one of the preceding
Claims wherein the nylon ring is made from nylon resin
with fibreglass reinforcement.
6. A thrust bearing as claimed in any one of the preceding Claims wherein the nylon ring is injection moulded.
7. A thrust bearing as claimed in Claim 6 wherein the injection moulding is carried out at a temperature of 265 to 295 degree C.
8. A thrust bearing substantially as herein described with
reference to, and as illustrated in, the accompanying
|Indian Patent Application Number||949/CHE/2007|
|PG Journal Number||03/2012|
|Date of Filing||03-May-2007|
|Name of Patentee||BEST ENGINEERS PUMPS PRIVATE LIMITED|
|Applicant Address||59-B THADAGAM ROAD VELANDIPALAYAM COIMBATORE 641 025|
|PCT International Classification Number||F16C33/02|
|PCT International Application Number||N/A|
|PCT International Filing date|