FR2662476A1 - Improved end-fitting, particularly ball joint - Google Patents

Improved end-fitting, particularly ball joint Download PDF

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Publication number
FR2662476A1
FR2662476A1 FR9006669A FR9006669A FR2662476A1 FR 2662476 A1 FR2662476 A1 FR 2662476A1 FR 9006669 A FR9006669 A FR 9006669A FR 9006669 A FR9006669 A FR 9006669A FR 2662476 A1 FR2662476 A1 FR 2662476A1
Authority
FR
France
Prior art keywords
recess
fitting
ball joint
self
improved end
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.)
Granted
Application number
FR9006669A
Other languages
French (fr)
Other versions
FR2662476B1 (en
Inventor
Pruvost Bernard
Buard Michel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SARMA SNC
Original Assignee
SARMA SNC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SARMA SNC filed Critical SARMA SNC
Priority to FR9006669A priority Critical patent/FR2662476B1/en
Publication of FR2662476A1 publication Critical patent/FR2662476A1/en
Application granted granted Critical
Publication of FR2662476B1 publication Critical patent/FR2662476B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0614—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part of the joint being open on two sides
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
    • F16C11/0623—Construction or details of the socket member
    • F16C11/0628—Construction or details of the socket member with linings
    • F16C11/0633—Construction or details of the socket member with linings the linings being made of plastics

Abstract

The subject of the present invention is an end fitting including an outer element (4) which has a fixing part (5) and at least one cylindrical or spherical recess (3), and an internal articulation element (2), the external shape of which corresponds to that of the recess (3) of the outer element and which is mounted in this recess. According to the invention, a self-lubricating material (6) is located in the housing (3) fixed to the outer element (4), and acts on the element (2) during the small movements.

Description

La présente invention concerne un embout amélioré comportant un élément extérieur qui présente une partie de fixation et au moins un évidement cylindrique et un élément intérieur dont la forme extérieure correspond à celle de l'évidement de l'élément extérieur et qui est monté dans cet évidement. Ces embouts fixés à l'extrémité d'une barre ou d'une bielle sont souvent utilisés notamment en aéronautique.The present invention relates to an improved end piece comprising an external element which has a fixing part and at least one cylindrical recess and an internal element whose external shape corresponds to that of the recess of the external element and which is mounted in this recess . These tips fixed to the end of a bar or a connecting rod are often used in particular in aeronautics.

Ces embouts résistent mal à la fatigue si l'on cherche à diminuer la section de l'évidement pour diminuer leur poids. Or, la rupture à la fatigue d'un embout peut avoir des conséquences catastrophiques. Cette rupture se produit le plus souvent dans l'une ou l'autre des deux zones critiques de l'élément extérieur situées de part et d'autre de l'axe de la partie de fixation, à une faible distance de cet axe.These tips are poorly resistant to fatigue if one seeks to reduce the section of the recess to reduce their weight. However, the fatigue failure of a tip can have catastrophic consequences. This rupture most often occurs in one or the other of the two critical zones of the external element situated on either side of the axis of the fixing part, at a short distance from this axis.

L'expérience montre que, sous l'effet de la fatigue, il se forme sur la paroi de l'évidement des fissures ou craquelures qui diminuent la surface efficace; de plus, les débris résultant de l'usure des surfaces en contact peuvent s'introduire dans les fissures et, par effet de coin, les élargir jusqu'à entralner la rupture.Experience shows that, under the effect of fatigue, cracks or cracks are formed on the wall of the recess which reduce the effective surface; moreover, the debris resulting from the wear of the surfaces in contact can be introduced into the cracks and, by wedge effect, widen them until causing the rupture.

Pour augmenter la résistance à l'usure d'un embout, on a proposé divers moyens, par exemple renforcer les zones critiques. Mais cette solution ne donne pas satisfaction car elle entraîne une augmentation de poids de l'embout, qui est gênante si l'embout est destiné à être utilisé sur un véhicule terrestre ou aérien.To increase the wear resistance of a tip, various means have been proposed, for example strengthening the critical zones. But this solution is not satisfactory because it leads to an increase in weight of the tip, which is troublesome if the tip is intended to be used on a land or air vehicle.

L'embout amélioré selon l'invention a au contraire une durée de vie accrue, sans que son poids en soit augmenté.The improved end piece according to the invention, on the contrary, has an increased service life, without its weight being increased.

L'embout selon l'invention est caractérisé en ce qu'un matériau autolubrifiant est interposé entre les éléments intérieur et extérieur de l'embout.The nozzle according to the invention is characterized in that a self-lubricating material is interposed between the interior and exterior elements of the nozzle.

On a décrit ci-après, à titre d'exemple non limitatif, un mode de réalisation de l'embout selon l'invention, avec référence à la Figure Unique du dessin annexé qui est une vue en coupe transversale de l'embout.An embodiment of the end piece according to the invention has been described below, by way of non-limiting example, with reference to the single figure of the appended drawing which is a cross-sectional view of the end piece.

Au dessin, on voit un embout qui comprend une articulation composée d'un élément intérieur sphérique 1 et d'une bague extérieure correspondante 2 qui est extérieurement cylindrique et est monté dans un évidement 3 de forme correspondante d'un élément extérieur 4; ce dernier présente une partie de fixation 5 qui pourrait être une partie taraudée, mais est ici constituée par une queue filetée. In the drawing, there is seen a nozzle which comprises a joint composed of a spherical inner element 1 and a corresponding outer ring 2 which is externally cylindrical and is mounted in a recess 3 of corresponding shape of an outer element 4; the latter has a fixing part 5 which could be a tapped part, but is here constituted by a threaded tail.

Dans la paroi de l'évidement 3, est disposé un matériau autolubrifiant 6. Ce dernier, fixé sur 4 permet de micro-déplacements du diamètre extérieur de l'élément d'articulation intérieur 2 et autorise un fonctionnement avec une direction d'efforts non privilégiée.In the wall of the recess 3, a self-lubricating material 6 is arranged. The latter, fixed to 4, allows micro-displacements of the outside diameter of the internal articulation element 2 and allows operation with a direction of effort not privileged.

I1 va de soi que la présente invention ne doit pas être considérée comme limitée au mode de réalisation décrit et représenté, mais en couvre, au contraire, toutes les variantes.  It goes without saying that the present invention should not be considered as limited to the embodiment described and shown, but on the contrary covers all variants thereof.

Claims (2)

RevendicationsClaims 1. Embout comportant un élément extérieur (4) qui présente une partie de fixation (5) et au moins un évidement cylindrique ou sphérique (3) et un élément d'articulation intérieur (2) dont la forme extérieure correspond à celle de l'évidement (3) de l'élément extérieur et qui est monté dans cet évidement, caractérisé en ce qu'un matériau autolubrifiant (6) est disposé dans le logement (3) fixé sur l'élément extérieur (4) et agit sur l'élément (2) lors des micro-mouvements.1. End piece comprising an external element (4) which has a fixing part (5) and at least one cylindrical or spherical recess (3) and an internal articulation element (2) whose external shape corresponds to that of the recess (3) of the external element and which is mounted in this recess, characterized in that a self-lubricating material (6) is disposed in the housing (3) fixed on the external element (4) and acts on the element (2) during micro-movements. 2. Embout selon la revendication 2, caractérisé en ce que le matériau autolubrifiant (6) entoure complétement l'élément d'articulation (2), ce qui autorise un fonctionnement avec une direction d'efforts non privilégiée. 2. End piece according to claim 2, characterized in that the self-lubricating material (6) completely surrounds the articulation element (2), which allows operation with an unfavorable direction of forces.
FR9006669A 1990-05-22 1990-05-22 IMPROVED TIP, IN PARTICULAR BALL JOINT. Expired - Fee Related FR2662476B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9006669A FR2662476B1 (en) 1990-05-22 1990-05-22 IMPROVED TIP, IN PARTICULAR BALL JOINT.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9006669A FR2662476B1 (en) 1990-05-22 1990-05-22 IMPROVED TIP, IN PARTICULAR BALL JOINT.

Publications (2)

Publication Number Publication Date
FR2662476A1 true FR2662476A1 (en) 1991-11-29
FR2662476B1 FR2662476B1 (en) 1992-10-23

Family

ID=9397058

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9006669A Expired - Fee Related FR2662476B1 (en) 1990-05-22 1990-05-22 IMPROVED TIP, IN PARTICULAR BALL JOINT.

Country Status (1)

Country Link
FR (1) FR2662476B1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1349008A (en) * 1970-08-05 1974-03-27 Heim Universal Corp Self-aligning bearing
FR2543633A1 (en) * 1983-04-02 1984-10-05 Lemfoerder Metallwaren Ag ELASTIC ARTICULATION

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1349008A (en) * 1970-08-05 1974-03-27 Heim Universal Corp Self-aligning bearing
FR2543633A1 (en) * 1983-04-02 1984-10-05 Lemfoerder Metallwaren Ag ELASTIC ARTICULATION

Also Published As

Publication number Publication date
FR2662476B1 (en) 1992-10-23

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