FR2501321A1 - Crank for camshaft for IC engine - is made from tube expanded to desired shape by internal pressure - Google Patents
Crank for camshaft for IC engine - is made from tube expanded to desired shape by internal pressure Download PDFInfo
- Publication number
- FR2501321A1 FR2501321A1 FR8104433A FR8104433A FR2501321A1 FR 2501321 A1 FR2501321 A1 FR 2501321A1 FR 8104433 A FR8104433 A FR 8104433A FR 8104433 A FR8104433 A FR 8104433A FR 2501321 A1 FR2501321 A1 FR 2501321A1
- Authority
- FR
- France
- Prior art keywords
- shaft
- hollow
- camshaft
- internal pressure
- internal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
- F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
Abstract
Description
L'invention concerne un arbre transformant une rotation en mouvements de translation non uniformes dans le temps, ou transformant de tels mouvements en une rotation, en particulier un arbre à cames, un vilebrequin ou un arbre analogue pour moteurs à combustion interne. The invention relates to a shaft transforming a rotation into non-uniform translation movements over time, or transforming such movements into a rotation, in particular a camshaft, a crankshaft or the like for internal combustion engines.
I1 est connu de réaliser des arbres en une ou plusieurs parties sous forme de corps creux. Ils sont generalement produits par alésage de pièces massives. I1 is known to make trees in one or more parts in the form of hollow bodies. They are generally produced by boring massive parts.
Lorsque de tels arbres doivent servir à transformer des rotations en mouvements de translation ou inversement, c'est- & dire lorsqu'ils doivent présenter radialement des saillies ou des creux à leur pourtour, il est toutefois impossible de les fabriquer sans soudages et reprises coûteux. When such shafts are to be used to transform rotations into translational movements or vice versa, that is to say when they have to present radially protrusions or hollows around them, it is however impossible to manufacture them without costly welding and reworking. .
La réduction de poids d'éléments de construction, en particulier de moteurs à combustion interne, est très importante de nos jours en raison des economies d'energie et elle est recherchée par tous les fabricants. L'execution d'un arbre à cames ou d'un vilebrequin pour moteurs à combustion interne comme une pièce creuse représente naturellement une grande reduction de poids, donc aussi une grande économie d'energie. Cependant, l'orientation naturelle des fibres dans les parois de ces arbres creux est sérieusement perturbée par des soudages, des usinages avec enlèvement de copeaux ou par des reprises ou opérations ultérieures, ce qui affaiblit leur résistance mécanique. The reduction in weight of construction elements, in particular internal combustion engines, is very important nowadays because of the energy savings and it is sought after by all manufacturers. The execution of a camshaft or a crankshaft for internal combustion engines as a hollow part naturally represents a great reduction in weight, therefore also a great saving of energy. However, the natural orientation of the fibers in the walls of these hollow shafts is seriously disturbed by welding, machining with chip removal or by resumptions or subsequent operations, which weakens their mechanical strength.
t'invention vise à creer un arbre comme indiqué au debut, qui possède à la fois une grande resistance mécanique et un faible poids, dont le coût de fabrication soit bas et qui puisse être fabrique avec des tolérances dimensionnelles suffisamment serrées pour qu'une reprise, du moins une reprise conteuse, ne soit pas necessaire. the invention aims to create a tree as indicated at the start, which has both a high mechanical strength and a low weight, the manufacturing cost of which is low and which can be manufactured with sufficiently close dimensional tolerances for a recovery , at least a storyteller repeat, is not necessary.
Selon une caractéristique essentielle de l'invention, l'arbre est realisé comme un corps creux selon un procéde connu de transformation par pression interne d'un matériau de départ tubulaire en une ou plusieurs partiels, les contours interieurs suivent les contours extérieurs pour l'essentiel dans toutes les coupes de l'arbre, de sorte que les surfaces intérieures et exterieures sont parallèles même si l'arbre possède une forme complexe, les cames, excentriques, manetons ou éléments analogues étant également creux. According to an essential characteristic of the invention, the shaft is produced as a hollow body according to a known process of transformation by internal pressure of a tubular starting material into one or more partial, the internal contours follow the external contours for the essential in all cuts of the tree, so that the interior and exterior surfaces are parallel even if the tree has a complex shape, the cams, eccentrics, crankpins or the like being also hollow.
De cette manière, d'une part, l'exécution creuse de l'arbre apporte une réduction de poids de 50% et davantage, d'autre part, le parallelisme des surfaces intérieures et extérieures assure une grande résistance mécanique, meme si l'arbre a une forme compliquée. In this way, on the one hand, the hollow execution of the tree brings a weight reduction of 50% and more, on the other hand, the parallelism of the interior and exterior surfaces ensures a great mechanical resistance, even if the tree has a complicated shape.
Une autre caractéristique prévoit qu'une extrémite ou chaque extrémité de l'arbre présente une rainure de centrage, formée par pressage, afin de permettre un centrage précis au centrale final ou en cas de reprise légère, si cela est nécessaire. Another characteristic provides that an end or each end of the shaft has a centering groove, formed by pressing, in order to allow precise centering at the final unit or in the event of slight recovery, if necessary.
Un important avantage de l'objet de l'invention est la précision avec laquelle l'arbre peut être fabriqué : celle-ci étant de 0,6 mm, une reprise est généralement superflue
Un exemple de réalisation non limitatif sera décrit plus en détail ci-après relativement au dessin annexe sur lequel
- la figure 1 est une vue en plan partiellement en coupe axiale d'un arbre à cames pour un moteur a combustion interne à huit cylindres;
- la figure 2 montre la rainure de centrage pressée dans une extrémité de l'arbre; et
- la figure 3 est une coupe transversale prise suivant la ligne I-I de figure 1.An important advantage of the object of the invention is the precision with which the shaft can be manufactured: this being 0.6 mm, a recovery is generally superfluous
A nonlimiting exemplary embodiment will be described in more detail below relative to the accompanying drawing in which
- Figure 1 is a plan view partially in axial section of a camshaft for an internal combustion engine with eight cylinders;
- Figure 2 shows the centering groove pressed into one end of the shaft; and
- Figure 3 is a cross section taken along line II of Figure 1.
Le dessin représente un arbre à cames creux 1. Comme on peut le voir sur la partie inférieure en coupe de figure 1, les surfaces intérieures 2 et les surfaces extérieures 3 de l'arbre sont essentiellement parallèles, ce qui correspond à une orientation naturelle favorable des fibres et produit par conséquent une résistance mécanique élevée. Comme le corps de llarbreJ chaque came 4 est également creuse. La figure 2, qui est une représentation à plus grande échelle du détail encerclé en bas de la figure 1, montre la rainure de centrage 5 pressée dans la face extrême de l'arbre. La figure 3 est une coupe transversale passant par une came, suivant la ligne I-I de figure 1. Cette coupe montre en particulier le paral lélisme de la surface extérieure et de la surface intérieure ainsi que l'exécution creuse de la came. The drawing represents a hollow camshaft 1. As can be seen on the lower section of FIG. 1, the interior surfaces 2 and the exterior surfaces 3 of the shaft are essentially parallel, which corresponds to a favorable natural orientation. fibers and therefore produces high mechanical strength. Like the shaft body, each cam 4 is also hollow. Figure 2, which is an enlarged representation of the detail circled at the bottom of Figure 1, shows the centering groove 5 pressed into the end face of the shaft. Figure 3 is a cross section through a cam, along the line I-I of Figure 1. This section shows in particular the parallelism of the outer surface and the inner surface as well as the hollow execution of the cam.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8104433A FR2501321A1 (en) | 1981-03-05 | 1981-03-05 | Crank for camshaft for IC engine - is made from tube expanded to desired shape by internal pressure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8104433A FR2501321A1 (en) | 1981-03-05 | 1981-03-05 | Crank for camshaft for IC engine - is made from tube expanded to desired shape by internal pressure |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2501321A1 true FR2501321A1 (en) | 1982-09-10 |
Family
ID=9255900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8104433A Withdrawn FR2501321A1 (en) | 1981-03-05 | 1981-03-05 | Crank for camshaft for IC engine - is made from tube expanded to desired shape by internal pressure |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2501321A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2892254A (en) * | 1953-06-08 | 1959-06-30 | American Radiator & Standard | Method of making cam shafts |
FR2034582A1 (en) * | 1969-03-01 | 1970-12-11 | Kloeckner Humboldt Deutz Ag | |
FR2237493A5 (en) * | 1972-07-01 | 1975-02-07 | Kloeckner Humboldt Deutz Ag | |
DE2914095A1 (en) * | 1979-04-07 | 1980-10-16 | Daimler Benz Ag | Hollow camshaft for IC engine prodn. - involves deep drawn half cams or bearings assembled mirror symmetrically and welded, with flanges formed by forging, or casting etc. |
-
1981
- 1981-03-05 FR FR8104433A patent/FR2501321A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2892254A (en) * | 1953-06-08 | 1959-06-30 | American Radiator & Standard | Method of making cam shafts |
FR2034582A1 (en) * | 1969-03-01 | 1970-12-11 | Kloeckner Humboldt Deutz Ag | |
FR2237493A5 (en) * | 1972-07-01 | 1975-02-07 | Kloeckner Humboldt Deutz Ag | |
DE2914095A1 (en) * | 1979-04-07 | 1980-10-16 | Daimler Benz Ag | Hollow camshaft for IC engine prodn. - involves deep drawn half cams or bearings assembled mirror symmetrically and welded, with flanges formed by forging, or casting etc. |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RE | Withdrawal of published application |