Claims
- 1. A method for manufacturing an elongated connecting rod made of composite material and having a central body (3) respectively extended at its two extremities by a connecting-rod big end (C) and a connecting-rod small end (D), the method comprising the steps of:
- a) producing a reinforcement sheet (P) comprising superposed plies of crossed straight filling yarns, some of said filling yarns extending parallel to a first direction and some of said filling yarns extending parallel to other directions, the filling yarns extending parallel to the first direction constituting at least twice the volume percentage of the filling yarns extending in each of said other directions, and binding yarns passing through said superposed plies, said reinforcement sheet (P) having:
- at least one thickened region (L1) obtained by laying down additional filling yarns (5A) when making said superposed plies, and
- additional filling yarns (4A) of said first direction going around said connecting-rod small end (D), said additional filling yarns (4A) being laid down when said superposed plies are made;
- b) cutting out at least one connecting-rod preform from said reinforcement sheet (P), the longitudinal extension (X-X) of said preform corresponding to said first direction and at least one connecting-rod end (C, D) of said preform corresponding to said at least one thickened region (L1);
- c) stitching strengthening yarns (I) into said preform, said strengthening yarns (I) going around said connecting-rod small end (D);
- d) impregnating said preform with a polymerizable synthetic material;
- e) curing said preform impregnated with said synthetic material; and
- f) machining said cured preform into the final state of said connecting-rod.
- 2. The method as claimed in claim 1, wherein said filling yarns of said reinforcement sheet which extend along said first direction comprise 0.degree. direction filling yarns and wherein said filling yarns of said reinforcement sheet which do not extend along said first direction comprise 45.degree., 90.degree. and 135.degree. direction filling yarns.
- 3. The method as claimed in claim 2, wherein as many of said 0.degree. direction filling yarns (4) are laid down as there are 45.degree., 90.degree. and 135.degree. direction filling yarns.
- 4. The method as claimed in claim 3, wherein for each series of superposed plies, the filling yarns are laid down according to the following sequence: said 0.degree. direction yarns, said 45.degree. direction yarns, said 0.degree. direction yarns, said 90.degree. direction yarns (5), said 0.degree. direction yarns (4) and said 135.degree. direction yarns.
- 5. The method as claimed in claim 3, wherein in step a) said additional filling yarns (5A) extend along the 90.degree. direction.
Priority Claims (1)
Number |
Date |
Country |
Kind |
94 04585 |
Apr 1994 |
FRX |
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Parent Case Info
This is a divisional of U.S. Ser. No. 08/720,213 filed Sep. 26, 1996, which is a continuation of U.S. Ser. No. 08/412,745 filed Mar. 29, 1995, now abandoned.
US Referenced Citations (21)
Divisions (1)
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Number |
Date |
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Parent |
720213 |
Sep 1996 |
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Continuations (1)
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412745 |
Mar 1995 |
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