EP1147308B1 - Starter equipped with an improved lever support part - Google Patents

Description

The present invention relates to a starter, and more particularly to a starter for an internal combustion engine of a motor vehicle.

A starter for a motor vehicle essentially comprises an engine electric and an electromagnetic actuator.

An example of a design of such a type of starter is for example illustrated in the document FR-B-2.699.605 in which the starter comprises a plate cross-section extending in a plane perpendicular to the plane containing the axes of the actuator and motor, and a starter nose.

The actuating lever is made in the form of a part whose part central is traversed by a hinge axis whose opposite ends are each received in two half-steps. The first two half-steps are trained to the rear end of a plate that extends longitudinally from the nose of starter by being material with this nose. The two second half-steps are formed at the front end of a rectangular plate that extends longitudinally and whose rear end is integral with an element forming the motor and electromagnetic actuator stall.

The object of the invention is to take advantage of this support piece comprising the second half-steps.

The invention proposes a starter of the type described above, of the type comprising an electromagnetic actuator and an electric motor of parallel axes and which are fixed on a starter frame having at least one nose of starter forming a cover which surrounds the end of the output member of the actuator electromagnetic and the free end before an output shaft driven by the engine electric and which carries a launcher, and of the type comprising an actuating lever which controls the axial movements of the launcher which is pivotally mounted about an axis which is substantially perpendicular to the axes of the motor and the actuator electromagnetic and each of whose transverse ends is pivotally mounted in a two-piece bearing having a first bearing portion carried by the starter nose and a second complementary bearing portion formed vis-à-vis in a bearing part of the lever connected to the engine casing and / or the crankcase. the electromagnetic actuator, characterized in that the lever support piece has a transverse annular crown which cooperates with a front part complementary to the electromagnetic actuator.

Thanks to the invention, the support piece intervenes between the actuator and the nose of the starter and has an additional function because it allows at first to mount the front part of the electromagnetic actuator on its crown.

This annular ring equipped with the actuator is then easily assembled in the upper part of the starter nose by interlocking, so that the mounting of the starter is facilitated. In addition the crown promotes filtration vibrations.

• le diamètre intérieur de la couronne annulaire correspond au diamètre de la partie avant complémentaire de l'actionneur électromagnétique, et, lors de l'assemblage du démarreur, la couronne annulaire entoure radialement la partie avant de l'actionneur électromagnétique de façon à assurer le centrage de l'actionneur électromagnétique ;
• la couronne annulaire comporte au moins un pion de positionnement qui s'étend axialement vers l'arrière et qui, lors de l'assemblage du démarreur, coopère avec au moins un trou complémentaire de l'actionneur électromagnétique de façon que l'actionneur électromagnétique soit indexé angulairement par rapport à la couronne annulaire ;
• la couronne annulaire comporte des moyens pour, lors de l'assemblage du démarreur, maintenir le corps d'une vis pour l'assemblage de l'actionneur électromagnétique et du nez de démarreur de façon que l'extrémité libre filetée de la vis soit en vis-à-vis d'un orifice taraudé destiné à la recevoir ;
• les moyens pour maintenir le corps de la vis sont deux lèvres qui s'étendent radialement vers l'extérieure depuis la périphérie de la couronne annulaire et qui ont un écartement sensiblement égal au diamètre de la vis.

According to other features of the invention:

• the inner diameter of the annular ring corresponds to the diameter of the complementary front part of the electromagnetic actuator, and, during assembly of the starter, the annular ring radially surrounds the front part of the electromagnetic actuator so as to ensure centering the electromagnetic actuator;
• the annular ring comprises at least one positioning pin which extends axially towards the rear and which, during assembly of the starter, cooperates with at least one complementary hole of the electromagnetic actuator so that the electromagnetic actuator is indexed angularly with respect to the annular ring;
• the annular ring comprises means for, during assembly of the starter, holding the body of a screw for assembling the electromagnetic actuator and the starter nose so that the threaded free end of the screw is vis-à-vis a tapped hole intended to receive it;
• the means for holding the body of the screw are two lips which extend radially outwardly from the periphery of the annular ring and which have a spacing substantially equal to the diameter of the screw.

Advantageously, the positioning pins are force-fitted into their complementary hole ensures that the actuator is captive.

Thanks to the crown, the sealing can be improved. Indeed in the document FR-B-2 699 905 mentioned above the contact of the front part of the electromagnetic actuator on the back side of the starter nose is done through surfaces metal which, for reasons of manufacture are not rigorously flat. Flatness defects do not result in small interstices.

When the vehicle is driving on a wet road, drops of water are projected on the starter. These run off on the latter and seep into the interstices. The water then enters the starter, and in particular the electromagnetic actuator. Moisture covers the mobile core which hinders its good sliding in the electromagnetic actuator. The operation of starter then begins to degrade until the actuator electromagnetic eventually breaks down.

To overcome this drawback, a solution proposes to set up a annular seal between the front part of the actuator electromagnetic and the rear face of the starter nose.

A sufficient seal is then obtained, but the cost caused by the seal as well as the manpower and the additional time required for its in place is very high.

The crown makes it easy and economical to replace this seal sealing.

So following an important feature the annular ring is arranged axially between the front part of the electromagnetic actuator and the free rear end of the starter nose and is mounted axially compressed from way to seal between these two elements.

Thus the mobile core can move easily because the water is not likely to infiltrate the starter. All this is favorable for the life of the starter.

• la figure 1 est une vue d'ensemble en section axiale d'un démarreur selon l'état de la technique ;
• la figure 2 est une vue de détail à plus grande échelle de la figure 1 avant le montage du démarreur ;
• la figure 3 est une vue partielle à plus grande échelle de la partie supérieure du démarreur selon l'invention ;
• la figure 4 est une vue en perspective éclatée de certains des composants du démarreur équipé d'une pièce d'appui pour le levier d'actionnement selon l'invention.

Other characteristics and advantages will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

• Figure 1 is an axial sectional view of a starter according to the state of the art;
• Figure 2 is a detail view on a larger scale of Figure 1 before mounting the starter;
• Figure 3 is a partial view on a larger scale of the upper part of the starter according to the invention;
• Figure 4 is an exploded perspective view of some of the components of the starter equipped with a support piece for the actuating lever according to the invention.

In the rest of the description, we will use a forward and backward orientation corresponding to the left-to-right orientation according to Figure 1.

A starter 10 according to the state of the art is illustrated in FIG. comprises a starter body or frame whose main element of the housing is a starter nose 12 located at the front and which is in the form of a molded part for example based on aluminum. An electromagnetic actuator 14 and an engine 16 are mounted and fixed to the back of nose 12.

The electromagnetic actuator 14 comprises a casing 15 of general shape cylindrical whose front portion, forming a carcass, comprises an annular shoulder 18 consisting of a first radial annular face 20 facing towards the front and one face cylindrical side 22. A second radial annular front face 21 of the front part is substantially perpendicular to the longitudinal axis A2 of the actuator electromagnetic 14.

An annular portion 24 corresponding to the shoulder 18 is formed at the rear the starter nose 12 for fitting by fitting of the actuator. She comprises a third radial annular face 23 facing towards the rear which, when the assembly of the starter 10 comes into contact with the first radial annular face 20, and a fourth radial annular face 25 facing backward, offset axially forwardly with respect to the third radial annular face 23. After the assembly, there is a clearance J1 between the second radial annular front face 21 of the electromagnetic actuator 14 and the fourth radial annular face 25 of the nose of starter 12.

The third 23 and the fourth faces 25 are interconnected by one face cylindrical lateral 26 of greater axial length than the lateral face 22.

The electric motor 16, of axis A1, notably comprises a housing generally cylindrical 17 and an armature shaft, not shown, whose front portion is stepped. A free end end section allows on the one hand the rotational guidance of the armature shaft and allows on the other hand to transmit a rotational movement to a epicyclic train which then rotates the rear free end section of a output shaft of the gearbox 32. The free end end section of the output shaft of gearbox 32 is guided in a bearing located in the starter nose 12, as visible in Figure 1 of FR-A-2699605.

The electric motor 16 is fixed to the starter nose 12 by screws of fastening 34, in the form of tie rods, which longitudinally pass through the housings 15 and 17 and which are screwed into tapped holes formed here in the starter nose 12.

A front thrower 36 slides axially on a fluted intermediate section 38 of the gearbox output shaft 32 between a position before meshing with a start crown and a rear rest position.

Such a ring is visible in FIG. 1 of FR-A-2 699 605 showing also the pinion that has in front the launcher to mesh with said crowned.

The sliding of the front thrower 36 is controlled by a lever 40 pivoting actuator whose drive is provided by the actuator electromagnetic 14.

The electromagnetic actuator 14 is of known structure, which will not be described in detail, and it allows, in addition to the power supply of the engine electrical 16 by a system called contactor, to cause the pivoting of the lever actuator 40 via an output member 50 whose free end front carries a transverse pin 52 which is received in a groove 54 formed in the upper end 56 of the actuating lever 40.

The output element consists of a rod with a hole at the front end for passage of the pin 52. As visible in Figure 1 of the document FR-A-2,699,605 the other end of the rod has a head for pressing a spring tooth against tooth (not visible) surrounding the stem and whose front end is supported on a mobile core 151 slidably guided by the casing of the housing 15 closed by a hood. The carcass carries at least one coil 152 carried by a support 153.

A fixed core 154 enters the support 153 of the coil 152 and serves as guide to a rod 155 pushing on a movable contact (not visible) able to cooperate with a fixed contact (not visible) to electrically power the electric motor 16.

The launcher 36 is slid by energizing the coil 152, for example by turning the ignition key, which makes it possible to create a field magnetic circulating in the carcass and the fixed core 154 and to move the core mobile 151.

The sliding gear then moves towards the crown of starting the engine of the motor vehicle.

Moving the mobile nucleus continues, we arrive at a position where the movable contact comes into contact with the fixed contact under the action of its associated stem 155 pushed by the movable core.

The electric motor 16 is then powered and driven in rotation to rotate the sprocket of the thrower and make it meshes with certainty with the starter crown.

The lever 40 is therefore allowed to pivot about an axis A3 described below and to support by its lower end on the launcher 36 as described below.

As soon as the ignition key is released, the coil 152 is no longer activated and a return spring 156 recalls the movable core 151 and the lever 40 in their position of rest.

In known manner the spring 156 surrounds the movable core 151 and takes support at one of its ends on the casing of the casing 15 and at the other of its ends on a shoulder belonging to a non-referenced part (as better visible in the Figure 4).

The actuating lever 40 is made of plastic, possibly reinforced by fibers, it is pivotally mounted about a transverse geometric axis A3 which is materialized by two opposite sections 58 of a cylindrical axis which extend from opposite sides of the body of the actuating lever 40. It is perpendicular to the plane of FIG. 1 containing the axis A1 of rotation of the armature shaft of the electric motor 16 and the axis A2 of the electromagnetic actuator 14.

The lower part 60 of the operating lever 40 has a shape of fork which cooperates with a control surface 62 of the launcher 36.

Each shaft section 58 is rotatably mounted in a two-piece bearing.

Each bearing thus comprises a first concave cylindrical half-bearing 64 and a second complementary concave cylindrical half-bearing 66.

The first two half-bearings 64, transversely opposed, are formed to the end of a horizontal plate portion 68 which protrudes from the inner side facing the rear of the starter nose 12.

The plate 68 is made by molding with the starter nose 12 and it extends in a plane containing the axis A3 and which is parallel to the axes A2 and A1 of the electromagnetic actuator 14 and the electric motor 16.

The plate 68 is positioned so that the axis A3 is located in a plane horizontal, considering Figure 1, which extends between the housings 15 and 17 of the electromagnetic actuator 14 of the electric motor 16.

The front portion of the plate 68 has a central clearance 70 which confers a fork shape so as to allow pivoting movements of the central portion vis-à-vis 72 of the actuating lever 40.

The two second concave cylindrical half-bearings 66 are formed in the front end of a front portion 80 in the form of a rectangular parallelepiped of a bearing piece 82 of the actuating lever 40.

The support piece 82 of the lever 40 is a single piece molded of material plastic, possibly reinforced with fibers, whose front portion 80 is a horizontal plate that extends in a plane that, in assembled position like this is illustrated in Figure 1, is in the extension of the horizontal plane of the part in plate form 68 of the starter nose 12.

The support piece 82 of the actuating lever 40 has a symmetry of design relative to a median vertical plane that contains the longitudinal axes A2 and A1 of the electromagnetic actuator 14 and the electric motor 16 and which corresponds to the section plane of Figure 1.

The front portion 80 also includes a clearance 84 to allow the pivoting movements of the corresponding face 86 of the central part of the body of the actuating lever 40 around the hinge axis A3.

The intermediate portion 88 of the support piece 82 is a vertical element which extends in a plane perpendicular to that of the front portion 80 and which comprises a first cylindrical upper concave surface 90 which is complementary to the shoulder 18 of the electromagnetic actuator 14.

More precisely, the cylindrical lateral faces 22 and 26 have the axis longitudinal axis A2. The lateral face 26 and the faces 23 and 25 are interrupted locally for the passage of the lever. Intermediate portion 88 closes this passage.

The rear portion 92 has the general shape of a tube sector. It involves on its underside of the ribs 94. Two of them extend down along of each of the longitudinal edges, and a third extends downwards transversely to the rear end of the portion 92.

When assembling the starter 10, the electric motor 16 as well as the gear output shaft 32 are fixed on the housing. Then, a set of in particular of the mechanical actuator 14, the actuating lever 40 and the workpiece 82 is placed in the upper part of the starter nose 12 so that, on the one hand, the shoulder 18 of the electromagnetic actuator 14 cooperates with the corresponding portion 24 of the starter nose 12 and, on the other hand, that the portions intermediate 88 and rear 92 of the support piece 82 of the lever 40 close an opening existing between the starter housing 10 and the casings 15 and 17 of the actuator electromagnetic 14 and the electric motor 16 respectively.

During assembly, the sections 58 of the hinge axis are resting on the two concave cylindrical second half-bearings 66 of the support piece 82 of the actuating lever 40, the hinge bearings themselves are reconstituted during the assembly operation of the electromagnetic actuator 14 and starter nose 12.

During operation of the starter 10, the intermediate portion 88 and the third transverse rib of the rear portion 92 allow to cash the axial forces caused by the support of the axis sections 58 on the two second half-bearings cylindrical 66. The third rib is intended here to rely on the front end of the stator 160 of the electric motor.

According to an embodiment of the invention illustrated in FIGS. 3 and 4, the part support 82 of the actuating lever 40, as well as the front part of the actuator electromagnetic 14 and the rear end of the starter nose 12 are modified.

Screws 104 are provided to assemble the cylinder head of the housing 15 to the nose 12 of the starter.

A transverse ring 100 of substantially annular shape extends vertically upwards from the upper face of the intermediate portion 88. The support piece 82 of the operating lever 40 and the transverse ring 100 are made by plastic molding and in one piece.

The outer diameter of the second radial annular front face 21 of the electromagnetic actuator 14 is reduced compared to the state of the art of way that it corresponds to the inside diameter of the transverse crown 100.

The axial thickness E of the transverse ring 100 is greater than the clearance maximum J2, shown in Figure 4, which exists after assembly of the starter 10, between the first 20 and the fourth 25 radial annular faces.

It will be noted that for greater clarity the return spring 156 and its support piece have not been shown in Figure 3.

When assembling the starter 10, the transverse ring 100 is in a first time mounted on the front portion of the electromagnetic actuator 14, its inner diameter allows both the centering of the second radial annular front face 21 of the contactor 14; the inner periphery of the ring 100 being in intimate contact with the cylindrical lateral face 22 corresponding to the external diameter of the second 21. The axis A4 of revolution of the transverse ring 100 corresponds to the axis longitudinal A2 of the electromagnetic actuator 14 constituting the axis of the face 26. The rear transverse transverse face 102 of the transverse ring 100 is then put bearing against the first radial annular face 20 of the actuator 14.

Next, the assembly 103 constituted by the electromagnetic contactor 14 and the transverse ring 100 is assembled to the starter nose 12. The periphery outer of the first radial annular face 20 is pressed against the face radially annular 23. The axial thickness E of the transverse ring 100 being greater than the maximum clearance J2, the transverse ring 100 is then compressed axially which makes it possible to seal against splashing water, at the level of surfaces in contact with the crown 100 and the second 21 and fourth 25 faces radial rings.

As will have been understood, the thickness E is slightly greater than the game maximum J2, all depending on the elasticity of the material used for the piece 82.

The difference is for example 0.5mm to 2mm depending on the material of the crown 100.

The axial force directed towards the rear exerted by the actuating lever 40 on the bearing piece 82 of the lever 40, increased by the axial compression force of the crown transverse 100, is less than the axial tightening force exerted by screws assembly 104 on the electromagnetic actuator 14 and the starter nose 12 of way that the first 20 and the third 23 radial annular faces are still in mutual support. Thus, the metal / metal contact ensures a stable attachment of the contactor eliminating all the problems due to creep and elasticity of the support piece 82 of the actuating lever 40 that would exist if it was involved in the fixation of the actuator 14 and the starter nose 12.

The transverse ring 100 thus allows one hand to center the actuator electromagnetic 14 and, secondly, to seal between the starter nose 12 and the electromagnetic actuator 14.

The return spring 156 and the movable core 151 of the actuator are not likely to so not to be reached by water coming from the outside so that a good sliding of the mobile core is assured.

Three positioning pins 106 are made on the transverse ring They have a conical shape and extend longitudinally backwards from the rear transverse face 102, their angular distribution with respect to the axis A4 of the transverse crown not being regular. Indeed, they allow indexing angular of the electromagnetic actuator 14 relative to the support piece 82 of the lever 40. For example, according to FIG. 2, the axis of a first pawn of positioning 106 is included in the median plane, while the other two 106 are located on the transverse ring 100 symmetrically with respect to the plane median. Three complementary longitudinal holes 108 are made in the first radial annular face 20 with their relative angular position which corresponds then to that of the three positioning pins 106.

The number of pions depends on the applications, a pion 106 being at least planned.

Thus, during the assembly of the electronic actuator 14 and the support piece 82 of the operating lever 40 a single angular position is possible so that the pawns 106 enter the holes 108.

Advantageously, the diameter of the base of the positioning pins 106 is slightly greater than the diameter of the holes 108. This makes it possible to improve the sealing inside the electromagnetic actuator 14 provided by the crown annular 100.

According to a variant not shown, the positioning pins 106 are cylindrical.

Means 110 for holding screws 104 are formed on the periphery of the transverse ring 100. They allow the passage and guiding of the screws The holding means 110 for the screws 104 are, for example, holes made directly in the transverse ring 100 or pairs of lips substantially parallel which extend radially to the transverse ring 100 according to the embodiment illustrated in Figure 3.

When assembling the assembly screws 104 are prepositioned in the assembly 103 so that the threaded free ends are oriented towards the rear. The screws 104 are introduced into unrepresented orifices of the nose of starter 12. These screws 104 are also maintained and precentred by the lips 110. Then the switch 14 is positioned on the pins 106. The ends of the screws 104 are thus automatically centered in front of threaded holes 109 arranged in the contactor 14. The screwing of the screws 104 is finally achieved by means of their screw heads, not shown, located outside the starter nose 12 and intended to build on it.

Advantageously, the passage width of the screws 104 in the means of maintenance 110 is slightly less than the diameter of the screws 104 so as to "pinch" them. Thus, these are pre-assembled in the assembly 103 without risk of losing them before starter assembly 10.

A flare 114 is formed on a front portion of the radial annular face interior of the transverse ring 100. The flare 114 has a frustoconical shape which facilitates the mounting, in the electromagnetic actuator 14, of the mobile core and than the return spring surrounding it. Indeed, the conical shape increases the diameter wherein the free rear end of the movable core is to be introduced initially during its mounting in the electromagnetic actuator 14.

Thus the support piece 82 of the lever 40 comprising the annular ring 100 makes it possible to economically perform several functions which are: the articulation of the operating lever 40, the centering of the electromagnetic actuator 14, the indexing angular of the actuator 14, the seal between the starter nose 12 and the actuator electromagnetic system 14, guiding and holding the assembly screws 104 as well as the prepositioning the movable core and its return spring before assembly in the electromagnetic actuator 14.

The support piece 82 of the actuating lever 40 according to the invention thus allows to facilitate the assembly of the starter 10 without increasing the number of pieces to assemble, nor the price of the starter 10.

The support piece 82 may be made according to the technique of comoulage with its lower part of rigid plastic material and its upper sealing part in elastic material.

Advantageously, a continuous bead forming a closed line on each radial faces of the ring 100, bearing on the faces 21 and 25, makes it possible to limit the compression force exerted during the tightening by means of the screws 104 during the assembly of the actuator 14 on the starter.

Note that the piece 82 made of plastic is light and does not risk rust. This piece reduces friction at the lever joint actuator 40, itself made of plastic. Corrosion phenomena are therefore reduced.

The part 82 and the lever 40 favor the reduction of the noises, are easily obtained by molding and make it possible to lighten the starter. These 40,82 pieces can have the desired shape and are economical.

In addition, the piece 82 allows by its portion 88 to close sealing the local opening made at the rear of the nose 12 for the passage of the lever 40. This opening affects the faces 25,26 as visible in FIG.

The piece 82 has another function because, thanks to its portion or rear portion 92, it closes tightly.an opening made in front of the casing 17, to avoid any movement of the room 82.

It is for this reason that the rear part has two ribs longitudinal capable of cooperating with the longitudinal edges of said opening.

The rear portion 92 is mounted, preferably by force, in the manner of a drawer in this opening.

As can be seen in FIG. 3, the ribs 94 are set back with respect to longitudinal side edges of the rear portion to obtain a good seal and easy assembly.

Here the third rib 94, perpendicular to the two other ribs, comes into stop against the stator 160 of the electric motor.

This is because the housing 17 has a front portion and a portion rear disposed on either side of the stator 160 closing the aforementioned opening. In variant this opening is closed by the housing itself then in one part.

Of course the presence of a reducer is not essential, the tree of output (the armature shaft) of the electric motor directly bearing the launcher as in FR-B-2699905.

In all cases, the output shaft carrying the launcher is rotated by the electric motor. In a variant, the output or armature shaft of the electric motor can be fluted at its free end and rotate an output shaft of the same manner as the output shaft of gear reducer 32 of FIG.

As is evident from the description and the drawings, the pawns are worn centrally by ears 160.

Advantageously, clearances are made in the lateral face cylindrical 26 of the nose of the starter, for mounting the ears 160 so that a locking in rotation of the ears 160 is achieved, these being advantageously engaged in tightening in their release.

Clearances are also made to pass the assembly screws 104.

Claims (8)

1. A starter (10) for a combustion engine, especially for a motor vehicle engine, of the type comprising an electromagnetic actuator (14) and an electric motor (16) having parallel axes (A2, A1), and fixed on a chassis of the starter (10) which includes at least one starter nose (12) defining a closure cap and surrounding the end of the output member (50) of the electromagnetic actuator (14) and the free front end of an output shaft (32), which is driven in rotation by the motor (16) and which carries a starter head (36), and of the type including an actuating lever (40) which controls axial displacements of the starter head (36), and which is pivoted about an axis (A3) substantially at right angles to the axes (A2, A1) of the motor (14) and electromagnetic actuator (14), each transverse end of the actuating lever being pivoted in a two-part bearing comprising a first bearing part (64) carried by the starter nose (12) and a complementary second bearing part (66) formed in facing relationship with it in an engagement member (82) for the actuating lever (40), connected to the casing (17) of the motor (16) and/or to the casing (15) of the electromagnetic actuator (14), characterised in that the engagement member (82) for the actuating lever (40) includes an annular transverse crown (100) which co-operates with a complementary front portion of the electromagnetic actuator.
2. A starter (10) according to the preceding Claim, characterised in that the annular crown (100) is disposed axially between the front portion of the electromagnetic actuator (14) and the free rear end of the starter nose (12), and is mounted so as to be compressed axially whereby to ensure sealing between the two said elements.
3. A starter (10) according to either one of the preceding Claims, characterised in that the internal diameter of the annular crown (100) corresponds to the diameter of the complementary front portion of the electromagnetic actuator (14), and in that, during assembly of the starter (10), the annular crown (100) radially surrounds the front portion of the electromagnetic actuator (14) so as to ensure centring of the electromagnetic actuator (14).
4. A starter (10) according to any one of the preceding Claims, characterised in that the annular crown (100) includes at least one positioning pin (106) which extends axially towards the rear and which, during assembly of the starter (10), co-operates with at least one complementary hole (108) in the electromagnetic actuator (14), whereby the electromagnetic actuator (14) is indexed angularly with respect to the annular crown (100).
5. A starter according to Claim 4, characterised in that the annular crown (100) includes a plurality of positioning pins (106) spaced apart angularly at irregular intervals.
6. A starter according to Claim 4 or Claim 5, characterised in that the positioning pin or pins (106) are frusto-conical in form and have a base diameter greater than that of their complementary hole (108).
7. A starter (10) according to any one of the preceding Claims, characterised in that the annular crown (100) includes means whereby, during assembly of the starter, the body of a screw (104) for assembling the electromagnetic actuator (14) and starter nose (12) together is held in such a way that the threaded free end of the screw is in facing relationship with a threaded aperture adapted to receive it.
8. A starter (10) according to the preceding Claim, characterised in that the means for retaining the body of the screw (104) consists of two lips (110) which extend radially outwards from the periphery of the annular crown (100), and which are spaced apart by an amount substantially equal to the diameter of the screw (104).

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