Epicyclic transmission provided with a lubricating system

Patent metadata

Field	Value
Publication number	US-9523424-B2
Application number	US-201514698723-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	Apr 30, 2014
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

An epyciclic transmission has a sun gear rotational about a transmission axis, a plurality of planet wheels meshing with the sun gear, and a carrier which supports the planet wheels and is rotational about the transmission axis; the transmission also has a lubricating system provided with at least one nozzle arranged in fixed position, with a collection channel fixed with respect to the carrier and configured to receive a jet of oil exiting from the nozzle, and with at least one pump having a casing fixed to the carrier; the pump is actuated by means of a transmission device in response to the rotation of the carrier to pump the oil from the collection channel to zones on the carrier which require lubrication.

First claim

The invention claimed is:

1. An epyciclic transmission comprising:
a sun gear rotational about a transmission axis;
a plurality of planet wheels meshing with said sun gear;
a carrier which supports said planet wheels and is rotational about said transmission axis;
a lubricating system adapted to transfer lubricant oil from a static structure to zones requiring lubrication on said carrier;
characterized in that said lubricating system comprises:
at least one nozzle arranged in fixed position and adapted to receive pressurized oil;
a collection channel fixed with respect to said carrier and configured so as to receive a jet of oil exiting from said nozzle;
at least one pump comprising:
a) a casing fixed to said carrier;
b) an inlet communicating with said collection channel;
c) an outlet communicating with the zones requiring lubrication;
d) a pumping device configured to pump oil from said inlet to said outlet;

a transmission assembly configured to actuate said pumping device in response to the rotation of said carrier about said transmission axis.

2. An epyciclic transmission according to claim 1 , characterized in that said transmission assembly comprises a transmission wheel fitted in a fixed and coaxial position to an actuating shaft of said pump.

3. An epyciclic transmission according to claim 2 , characterized in that said transmission assembly further comprises a ring gear coaxial to said carrier and coupled to said transmission wheel.

4. An epyciclic transmission according to claim 3 , characterized in that said ring gear is fixed.

5. An epyciclic transmission according to claim 3 , characterized in that said transmission wheel has a toothing meshing directly with said ring gear.

6. An epyciclic transmission according to claim 1 , characterized in that said pump has an actuating shaft having a rotation axis which is parallel and eccentric with respect to said transmission axis.

7. An epyciclic transmission according to claim 1 , characterized in that said lubricating system comprises a plurality of said pumps arranged about said transmission axis.

8. An epyciclic transmission according to claim 1 , characterized in that said collection channel is a continuous annular channel, having an annular opening facing radially inwards with respect to said transmission axis.

9. An epyciclic transmission according to claim 1 , characterized in that said carrier comprises an annular plate portion axially facing said planet wheels; said collection channel being arranged along an annular edge of said annular plate portion.

10. An epyciclic transmission according to claim 1 , characterized in that said at least one nozzle is spaced apart from said collection channel by a gap absent of intervening components.

Assignees

• Ge Avio Srl

Inventors

• Altamura Paolo

Classifications

• F16H57/082

  Planet carriers · CPC title

• F16H57/0434

  relating to lubrication supply, e.g. pumps; Pressure control · CPC title

• F16H57/043

  within rotary parts, e.g. axial channels or radial openings in shafts · CPC title

• F16H57/0479 Primary

  Gears or bearings on planet carriers · CPC title

• F16H57/0441

  Arrangements of pumps · CPC title