AU2014201607B2 - VIBFEM Gearless exciter with significantly improved lubrication system upper bearings - when the exciter operates in inclined position( standard operating position is at 45 degrees) will provide reliable oil sump lubrication for all bearings and therefore better bearing life and improved reliability. Another factor is that it does not have gears which when wearing during impact condition, contaminate the oil with metal particles and increase the oil temperature which leads to oil degradation. Modifications will also allow to reduce weight and cost of exciter fabrication. - Google Patents

Abstract

Abstract The gear housing is split into two chambers to provide reliable oil sump lubrication. The exciter will be driven by two external electric motors and because of the counter rotation the counterweights will self-synchronise together and about the centre of gravity of the vibrating screen. Gearless exciter with significantly improved lubrication system upper bearings when the exciter operates in inclined position (standard operating position is at 45 degrees) will provide reliable oil sump lubrication for all bearings and therefore better bearing life and improved reliability. Another factor is that it does not have gears which when wearing during impact condition, contaminate the oil with metal particles and increase the oil temperature which leads to oil degradation. xx \ \-NN R' na eier. Fig.1 Example of single deck VIBFEM Gearless exciter.

Description

VIBFEM Gearless Exciter- description BACKGROUND OF INVENTION [0001] The invention present a new design of an exciter to drive vibrating equipment. [0002] Currently exciters have single internal chamber and when exciter operates inclined(99% of cases) bearings in upper position are splash lubricated which is unreliable and no lubrication is available to the upper bearings for some time after exciter starts(before oil is delivered to bearings through splashing). The major problem with current designs is lubrication of external races of double row bearings in upper position through holes in exciter housing and the oil being delivered to the holes by splash lubrication which is very unreliable especially with often stop and start of the exciter. [0003] New exciter design has two internal chambers that enable all bearings to work continuously in oil bath(lower and upper bearings) which results in proper continuous lubrication and correct heat transfer from bearings to housing. [0004] Gears which are standard in current exciter designs have been removed from VIBFEM Gearless exciter. Instead of gears the phenomenon of self-synchronisation is used to force the counterweights to work in phase. Both shafts of VIBFEM Gearless exciter have to be driven (two electric motors) instead of one electric motor as on currently used designs with oil lubrication. [005]Rotating counterweights will self -synchronise about each other because of the self synchronisation phenomenon but they will also seek to self -synchronise about the centre of gravity of a vibrating screen(or other vibrating machine). In standard geared exciter design, the gears will prevent self-synchronisation of exciter counterweights in relation to the centre of gravity of the vibrating screen which will result in extra power required to drive the exciter, extra heat generated from the gears, increased oil temperature and metal debris from wearing gears contaminating lubrication oil. VIBFEM Gearless exciter will self synchronise itself with a centre of gravity of a driven machine.

Claims (2)

1. A Gearless exciter for causing vibration of a vibrating screen or a vibrating feeder comprising two shafts each including a counterweight, when rotated, creating an unbalanced centripetal force which is transferred through a housing to the screen or feeder; each shaft rotatably mounted in opposing bearings and supported in the housing side walls; each shaft including an independently driving motor; the housing including two chambers, each chamber forming separate oil sumps for each shaft bearings; wherein all bearings are continuously operate in an oil bath which provides lubrication of bearings.

2. A gearless exciter according to claim 1 does not have gears which enabled to split the single oil sump in the standard design into 2 independent oil sumps for the gearless VIBFEM exciter(additional wall in the hosing splitting the internal oil sump - if compared to standard existing exciters) and this way creating reliable oil bath lubrication system. It does not have gears which prevents oil contamination with metal particles and additional increase of the oil temperature from extra heat generated by the working gears.