FR2459376A1

FR2459376A1 - Casing for IC engine ignition distributor - comprises flanged cylindrical box with four arc shaped locating lugs fitting into underside of cover

Info

Publication number: FR2459376A1
Application number: FR8010763A
Authority: FR
Inventors: Dieter Trautwein; Richard Gerber
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1979-06-15
Filing date: 1980-05-13
Publication date: 1981-01-09
Also published as: DE7917194U1

Abstract

The ignition distributor housing comprises a hollow cylindrical box (17) which has a flange (19) extending from its top edge. The flange includes two widened portions (20) in which there are holes for fixing bolts. On the upper surface of the flange are four raised portions (21) lying in a circle with their inner edges in line with the inside of the cylindrical box. The cover for the box (10) comprises a disc having a flat rim which lies over the flange on the box. The rim has four raised areas (14) corresponding to the raised surfaces of the flange, serving to align the cover with the box. The central part of the cover is at a higher level than the rim, with a central opening and collar. The cover is made of thin thermoplastic material and has bolt holes corresponding to those in the box.

Description

L'invention concerne un distributeur d'allumage pour moteurs à combustion interne, pourvu d'un couvercle fixé en position centrée entre le bottier et le capot du distributeur. The invention relates to an ignition distributor for internal combustion engines, provided with a cover fixed in a centered position between the case and the distributor cover.

Un distributeur d'allumage de ce genre est déjà connu d'après le brevet allemand 862 979. Dans ce distributeur d'allumage le couvercle est centré sur la paroi intérieure du bottier au moyen d'un épaulement axial et sa partie extérieure stapplique complètement sur le bord lisse du bottier. Le capot est fixé au bottier au moyen de ressorts et comporte un bourrelet assurant le centrage sur la surface extérieure du boftier. An ignition distributor of this kind is already known from German patent 862 979. In this ignition distributor, the cover is centered on the interior wall of the bootmaker by means of an axial shoulder and its external part is applied completely to the smooth edge of the shoemaker. The cover is fixed to the case by means of springs and includes a bead ensuring centering on the exterior surface of the case.

Si l'on utilisait ce genre de centrage et de fixation du couvercle avec des capots qui se vissent, les oeillets de fixation, s'écartant radialement du capot et du bottier, donneraient lieu à un diamètre hors tout démesurément grand; un tel agrandissement des dimensions pose de sérieux problèmes en raison des conditions d'encombrement très réduites dans l'espace intérieur du moteur des véhicules automobiles et doit par conséquent être évité. If this kind of centering and fixing of the cover were used with screw-on covers, the fixing eyelets, deviating radially from the cover and the case, would give rise to an excessively large overall diameter; such an enlargement of the dimensions poses serious problems because of the very reduced space requirements in the interior space of the engine of motor vehicles and must therefore be avoided.

Le distributeur d'allumage conforme à l'invention, destiné à remédier à ces inconvénients, est caractérisé en ce qu'au moins deux saillies, diamétralement opposées, qui s'écartent d'une bride du bottier, sur une étendue radiale moindre que la bride, des surfaces de centrage étant ménagées sur la bride du capot et s'appliquant radialement contre les saillies, leur hauteur étant supérieure à celle de ces saillies, et le couvercle présentant un évidement dans la zone de chaque surface de centrage. The ignition distributor according to the invention, intended to remedy these drawbacks, is characterized in that at least two protrusions, diametrically opposite, which deviate from a flange of the shoemaker, over a radial extent less than the flange, centering surfaces being provided on the flange of the cover and applying radially against the projections, their height being greater than that of these projections, and the cover having a recess in the zone of each centering surface.

Un distributeur d'allumage ainsi réalisé résoud le problème évoqué plus haut, notamment grâce aux minces saillies prévues, et les éléments du couvercle se trouvent fermement enserrés de tous côtés entre le capot et le bottier, même dans le cas dtun total défavorable de toutes les tolérances de fabrication. An ignition distributor thus produced solves the problem mentioned above, in particular by virtue of the thin projections provided, and the elements of the cover are firmly clamped on all sides between the cover and the case, even in the case of an unfavorable total of all the manufacturing tolerances.

Les dispositions qui seront indiquées dans la suite permettent de réaliser des modes d'agencement avantageux et des perfectionnements du distributeur d'allumage tel que défini ci-dessus. Notamment son mode de réalisation selon lequel les saillies prévues sont en affleurement avec la surface inté rieure du boitier constitue une construction très simple à fabriquer. The arrangements which will be indicated below make it possible to carry out advantageous modes of arrangement and improvements of the ignition distributor as defined above. In particular its embodiment according to which the projections provided are flush with the interior surface of the housing constitutes a construction that is very simple to manufacture.

L'invention sera mieux comprise à l'aide de la description ci-après et des dessins annexés représentant un exemple de réalisation de l'invention, dessins dans lesquels
- la figure 1 est une vue en perspectiveà échelle réduite du couvercle et d'une partie du boîtier,
- la figure 2 est une vue en coupe axiale partielle dans la zone des oeillets de fixation.The invention will be better understood with the aid of the description below and the appended drawings representing an embodiment of the invention, drawings in which
FIG. 1 is a perspective view on a reduced scale of the cover and part of the housing,
- Figure 2 is a partial axial sectional view in the area of the fixing eyelets.

Un mince couvercle 10, fabriqué en matière synthétique thermoplastique, comporte un col 11, une calotte 12 qui s'y raccorde, et qui se continue par quatre traverses 13 auxquelles fait suite une plaque annulaire 15, et par quatre segments 14. Chaque segment 14 présente une section transversale en forme de C, de sorte qu'un évidement 16 se trouve formé dans chacun de ces segments. A thin cover 10, made of thermoplastic synthetic material, has a neck 11, a cap 12 which is connected thereto, and which is continued by four crosspieces 13 which are followed by an annular plate 15, and by four segments 14. Each segment 14 has a C-shaped cross section, so that a recess 16 is formed in each of these segments.

Le distributeur d'allumage comporte un boiter 17, qui présente une paroi 18 en forme de cylindre creux, qui s'élargit pour former une bride 19 pourvue de deux oeillets de fixation 20. Quatre saillies 21 s'écartent en direction radiale du bord de la bride 19 et s'étendent en affleurement avec la surface intérieure 22 du boiter 17. Ces saillies 21 sont disposées symétriquement par rapport au plan médian, passant par l'axe, des oeillets de fixation 20, et la dimension sur laquelle les saillies s'étendent en direction radiale est inférieure à la largeur de la bride 19. The ignition distributor comprises a box 17, which has a wall 18 in the form of a hollow cylinder, which widens to form a flange 19 provided with two fixing eyelets 20. Four projections 21 deviate in the radial direction from the edge of the flange 19 and extend flush with the inner surface 22 of the housing 17. These projections 21 are arranged symmetrically relative to the median plane, passing through the axis, of the fixing eyelets 20, and the dimension on which the projections s extend in the radial direction is less than the width of the flange 19.

La figure 2 montre en vue partielle un capot de distributeur 23, dont la paroi 24 se continue également par une bride 25, dans laquelle sont ménagées par évidements quatre surfaces de centrage 26. Leur hauteur, c'est-à-dire la dimension sur laquelle ces surfaces s'étendent en direction axiale, est supérieure à la hauteur des saillies 21 , de telle sorte quil en résulte, lorsque le capot 23 est vissé à fond, un espace vide 27. D'autre part on a représenté en vue partielle un arbre de distributeur 28 muni d'un rotor distributeur 29 - ou doigt d'allumeur - dont la tige 30 est entourée avec Jeu par la traverse 13 du couvercle 10. FIG. 2 shows in partial view a distributor cover 23, the wall 24 of which also continues with a flange 25, in which four centering surfaces 26 are formed by recesses. Their height, that is to say the dimension on which these surfaces extend in the axial direction, is greater than the height of the projections 21, so that it results therefrom, when the cover 23 is screwed in fully, an empty space 27. On the other hand, there is shown in partial view a distributor shaft 28 provided with a distributor rotor 29 - or igniter finger - whose rod 30 is surrounded with clearance by the cross member 13 of the cover 10.

Dans l'état de fonctionnement du distributeur d'allumage que représentent les dessins, la plaque annulaire 15 et les traverses 13 du couvercle 10 se trouvent enserrées entre les brides 19 et 25, et les segments 14 se centrent sur les surfaces 26 du capuchon 23 de telle sorte que le couvercle 10 sépare l'espace intérieur 31 du boitier de l'espace intérieur32 du capuchon. In the operating state of the ignition distributor represented in the drawings, the annular plate 15 and the cross members 13 of the cover 10 are sandwiched between the flanges 19 and 25, and the segments 14 are centered on the surfaces 26 of the cap 23 so that the cover 10 separates the interior space 31 of the housing from the interior space 32 of the cap.

Claims

1.- Plumage distributor for internal combustion engines, provided with a cover fixed in a centered position between the case (17) and the cover (29) of the distributor, characterized by at least two diametrically opposite projections (21) which deviate from a flange (19) of the boot (17), over a radial extent less than the flange (19), centering surfaces (26) being formed on the flange (25) of the cover (23) and s 'applying radially against the projections (21), their height being greater than that of these projections, and the cover (10) having a recess (16) in the region of each centering surface (26).

2. An ignition distributor according to claim 1, characterized in that the projections (21) are flush with the inner surface (22) of the shoemaker (17).

3.- Ignition distributor according to one of claims 1 and 2, comprising two fixing eyelets on the hood and on the boot, characterized in that four projections (21), four recesses (16) and four centering surfaces (26) are provided each time, and are arranged symmetrically with respect to the median plane, passing through the axis, of the fixing eyelets (20).

4. An ignition distributor according to any one of claims 1 to 3, characterized in that the cover (10) is made of thermQ- plastic synthetic material.