Speed reduction gear comprising two intermediate transmission lines

Patent metadata

Field	Value
Publication number	US-10443697-B2
Application number	US-201515514216-A
Country	US
Kind code	B2
Filing date	Sep 18, 2015
Priority date	Sep 30, 2014
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

Speed reduction gear comprising two intermediate transmission lines, in particular for a turbine engine, comprising an input line ( 12 ) and an output line that is driven by the input line via said intermediate transmission lines, said intermediate transmission lines being substantially parallel, characterized in that said reduction gear comprises means for distributing loads between said intermediate lines, said load distribution means comprising swiveling coupling means ( 30 ) for rotatably coupling one end of the input line, and oil-damping means ( 40, 50 ) for damping radial movements of an opposite end of the input line.

First claim

The invention claimed is:

1. Speed reduction gear comprising two intermediate transmission lines, comprising an input line and an output line that is driven by the input line via said intermediate transmission lines, said intermediate transmission lines being substantially parallel, wherein said reduction gear comprises means for distributing loads between said intermediate lines, said load distribution means comprising swivelling coupling means for rotatably coupling one end of the input line, and oil-damping means for damping radial movements of an opposite end of the input line.

2. Reduction gear according to claim 1 , wherein the damping means are designed to allow the input line to move in a direction substantially perpendicular to a plane passing substantially through axes of the intermediate lines.

3. Reduction gear according to claim 1 , wherein the input line is rotated by an antifriction bearing, said bearing comprising an outer race that is mounted so as to be radially slidable in a slide and that defines a damping oil chamber together with walls of said slide.

4. Reduction gear according to claim 3 , wherein said race has an annular inner periphery that defines a raceway, and a generally square or rectangular outer periphery, the parallel and opposing lateral edges of which cooperate in a sliding manner with the lateral walls of the slide.

5. Reduction gear according to claim 4 , wherein said oil chamber comprises an upper oil cavity delimited between the outer race and an upper wall of the slide, and a lower oil cavity delimited between the outer race and a lower wall of the slide.

6. Reduction gear according to claim 5 , wherein the outer race comprises an outer peripheral groove that provides fluid communication between said upper and lower cavities.

7. Reduction gear according to claim 3 , wherein the outer race has a front annular seal and a rear annular seal which cooperate with front and rear walls, respectively, of said slide.

8. Reduction gear according to claim 3 , wherein the slide is fixed to a housing of the reduction gear.

9. Reduction gear according to claim 1 , wherein the swivelling means and the damping means are mounted on either side of a gear of the input line.

10. Turbine engine, which comprises at least one reduction gear according to claim 1 .

Assignees

• Safran Trans Systems

Inventors

• Feraud Benjamin
• Amiet Maxime
• Beck Guillaume
• Becquerelle Samuel Raymond Germain
• Mathieu Antoine
• Morelli Boris

Classifications

• F16H1/22 Primary

  with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts · CPC title

• F05D2250/312

  the axes being parallel to each other · CPC title

• F02C7/32 Primary

  Arrangement, mounting, or driving, of auxiliaries · CPC title

• F02C7/36

  Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user ({F02C3/107 - F02C3/13 and} F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H) · CPC title

• F16H57/021

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title