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1. WO2020109772 - ENGRENAGES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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CLAIMS:

1. A gear comprising a first component of a first material, and a second, composite material component of a second, different material, the composite material component including an engagement section bearing against the first component, wherein the engagement section is of a composite material designed such that the coefficients of thermal expansion of the composite material and the material of the first component substantially match one another in the axial direction of the first component.

2. A gear according to Claim 1, wherein the composite material is of braided form.

3. A gear according to Claim 1, wherein the composite material is of fibre wound form.

4. A gear according to any of the preceding claims, wherein a fibre angle of the composite material of the engagement section is chosen relative to the coefficients of thermal expansion of the fibre material and the material of the first component so as to substantially match thermal expansion of the engagement section in the axial direction to that of the first component.

5. A gear according to any of the preceding claims, wherein the surface of the first component that engages the engagement section is provided with a microspline formation.

6. A gear according to any of the preceding claims, wherein the coefficient of thermal expansion of the engagement section and that of the first component are within 5% of one another.

7. A gear according to any of the preceding claims, wherein the fibre angle of the engagement section is in the region of 40-60°.

8. A gear according to Claim 7, wherein the angle is in the region of 45-55°.

9. A gear according to Claim 8, wherein the angle is in the region of 52°.

10. A gear according to any of the preceding claims, wherein the first component is of a metallic material.

11. A gear according to any of the preceding claims, wherein the first component is formed with a series of gear teeth.

12. A gear according to any of the preceding claims, wherein the engagement section is of relatively great wall thickness, so as to be able to transmit loads around the gear.

13. A gear comprising a first component of a first material, and a second, composite material component of a second, different material, the composite material component including an engagement section bearing against the first component, wherein the engagement section is of fibre reinforced composite material form, wherein a fibre angle of the engagement section is chosen relative to the coefficients of thermal expansion of the fibre material and the material of the first component so as to achieve a peak compressive load between the engagement section and the first component at a selected operating temperature of the gear.

14. A gear comprising a first component of a first material, and a second, composite material component of a second, different material, the composite material component including an engagement section bearing against the first component, wherein the engagement section is of composite material form, wherein face of the first section engaged by the engagement section is of non-uniform diameter along its length, and the face of the engagement section is correspondingly shaped.

15. A gear according to Claim 14, wherein the interengaging faces of the first component and the engagement section are of tapering and/or stepped form.

16. A gear according to any of the preceding claims, wherein the gear comprises a planet gear, and the second, composite material component is shaped to carry the outer race of a bearing, or to form the outer race of a bearing whereby the gear is rotatably mounted upon a support or carrier.

17. A gear according to any of Claims 1 to 15, wherein the gear comprises a ring gear, the first component being located radially within the second component, and a reinforcing ring is provided to apply a load to the second component to compress it against the first component.

18. A gear comprising a metallic material component of annular form, and a composite material component, wherein the composite material component includes an outer layer or ply of reinforcing material bound with a resin material, the outer layer or ply being of relatively thick form.

19. A gear according to Claim 18, wherein the outer layer or ply is of thickness in the region of at least 3 to 5 times the diameter of the reinforcing material.

20. A gear according to Claim 18 or Claim 19, wherein the metallic component is a press fit with the composite material component.

21. A gear according to Claim 20, wherein the metallic component is provided, on a surface thereof which, in use, cooperates with the composite material component, with a series of spline teeth formations.

22. A gear according to Claim 21, wherein the spline teeth are of small radial height, preferably of less than 0.25mm height.

23. A gear according to any of Claims 18 to 22, wherein the composite material is of electrically conductive form, and a non-conductive material coating is applied to the surface of the metallic component that, in use, engages with the composite material component.

24. A gear according to any of Claims 18 to 23, wherein the composite material component comprises layers of woven fibrous material, adjacent layers being orientated such that the threads or fibres of one of the layers are angularly offset relative to the threads or fibres of the adjacent layer.

25. A gear according to any of claims 18 to 24, further comprising a composite material retainer to secure the metallic material component so the composite material web component to reduce or avoid relative movement therebetween.

26. A gear according to Claim 25, wherein the retainer comprises one or more annular components of a composite material that may be press fitted to the metallic material component.

27. A gear according to Claim 25 or Claim 26, wherein the composite material retainer comprises fibres of a reinforcing material that are wound across a face of the gear between a first point on a periphery thereof and a second point on the periphery thereof spaced from the first point.

28. A gear according to Claim 27, wherein the first and second points are located substantially diametrically opposite one another.

29. A gear according to Claim 27, wherein the first and second points are angularly spaced apart by less than 150°.

30. A gear comprising a metallic material component of annular form, and a composite material web component, and a composite material retainer to secure the metallic material component so the composite material web component to reduce or avoid relative movement therebetween.

31. A gear according to Claim 30, wherein the retainer comprises one or more annular components of a composite material that may be press fitted to the metallic material component.

32. A gear according to Claim 30 or Claim 31, wherein the composite material retainer comprises fibres of a reinforcing material that are wound across a face of the gear between a first point on a periphery thereof and a second point on the periphery thereof spaced from the first point.

33. A gear comprising a metallic material component and a composite material component, wherein a peripheral surface of the component material component engaged by the metallic material component is of toothed form, and the metallic material component is of thin walled form.

34. A gear comprising a metallic material component of annular form, and a composite material component, the composite material component comprising a laminate made up of a plurality of layers of woven fibrous material, at least some adjacent layers being orientated such that the threads or fibres of one of the layers are angularly offset relative to the threads or fibres of the adjacent layer, each layer having an outer periphery of circular shape.