EP2859218A1

EP2859218A1 - Starter motor provided with a translatably fixed free wheel

Info

Publication number: EP2859218A1
Application number: EP13728452.7A
Authority: EP
Inventors: Maximilien Gentil; Alexandre SALTEL
Original assignee: Valeo Equipements Electriques Moteur SAS
Current assignee: Valeo Equipements Electriques Moteur SAS
Priority date: 2012-05-16
Filing date: 2013-05-16
Publication date: 2015-04-15
Also published as: KR20150008411A; CN104334869A; US20150130309A1; FR2990729A1; IN2014DN08680A; CN104334869B; FR2990729B1; WO2013171432A1

Abstract

The invention essentially relates to a starter motor (1) for a heat engine of a motor vehicle, comprising: an electric motor having a stator (7) and a rotor (3) mounted on a rotor shaft (5); a translatably mobile starter shaft (15) carrying a drive pinion (13) that can move from an idle position wherein the drive pinion (13) is released from a rotational element connected to the crankshaft of the heat engine to an active position wherein the drive pinion (13) is used to rotatably drive the rotational element connected to the crankshaft of the heat engine; and a speed reducer group (17) inserted between the rotor shaft (5) and the starter shaft (15). The invention is characterised in that it also comprises a translatably fixed free wheel (16) that has an input end rotatably connected to the speed reducer group (17) and an output end consisting of a drive shaft (18). The starter shaft (15)is mounted in a translatably mobile manner on the drive shaft (18) by means of a helicoidal connection.

Description

STARTER FOR COMBUSTION ENGINE

[01] TECHNICAL FIELD OF THE INVENTION

[02] The invention relates to a launcher starter with a freewheel immovable in translation. The invention finds a particularly advantageous, but not exclusive, application with vehicles equipped with the function of stopping and restarting the engine (so-called "stop and start" function) according to which the engine of the vehicle is stopped due to traffic conditions (especially during a stop at a red light) and then restarted to save fuel.

[03] STATE OF THE ART

[04] To start a thermal engine, also called internal combustion engine, including a motor vehicle, it is known to use a rotating electrical machine in the form of a starter provided with a launcher capable of transmitting energy rotating the starter to a crankshaft of the engine through a driving ring.

[05] The launcher is slidably mounted on a drive shaft in relation to the shaft of the electric machine via a gear unit. For this purpose, the launcher comprises a drive pinion and a freewheel, generally of the freewheel type, mounted on the drive shaft configured to be actuated by the control lever. More specifically, the free wheel comprises a sleeve connected to the drive shaft by a helical link, the control lever being connected to the sleeve. The sleeve is secured to the front of a flange of transverse orientation relative to the axis of the drive shaft. This flange is integral at its outer periphery with a sleeve of axial orientation forming, in combination with washers, a cage for the rollers of the freewheel cooperating with the body of the pinion forming the output of the freewheel. [06] Such a configuration poses endurance problems on the starters used with the "stop and start" technology that need to be able to operate over a very large number of cycles. Indeed, there is a premature wear of the freewheel because it is mounted with clearance on the drive shaft through the helical link. Indeed, this game generates vibrations when the freewheel rotates which tend to wear the internal elements of the freewheel, in particular the rollers, and whether the starter operates in overspeed or not. In addition, the fact that the freewheel is part of the mass to be moved by the control lever implies a high inertia of the launcher, and requires a contactor powerful enough to move this set of elements.

[07] OBJECT OF THE INVENTION

[08] To solve this problem of endurance, the invention proposes an architecture in which the freewheel is connected to the output of the gearbox and held stationary in translation relative to the starter casing. According to this configuration, the control lever ensures the movement of a launcher shaft carrying the pinion mounted on the drive shaft via a helical link. The invention thus makes it possible to reduce the inertia of the launcher consisting solely of the pinion and the pinion body. In addition, the play of the freewheel is reduced because of its maintenance by the carcass. Thus, the contactor may be smaller in size as the power required to move the starter shaft is reduced.

[09] For this purpose, the invention relates to a starter for a combustion engine of a motor vehicle comprising:

an electric motor having a stator and a rotor mounted on a rotor shaft,

- A launcher shaft movable in translation carrying a drive member adapted to move from a rest position in which the drive member is disengaged from a rotary member connected to the crankshaft of the heat engine to an active position in which the driving member is intended to drive in rotation the rotary element connected to the crankshaft of the heat engine,

a speed reduction unit interposed between the rotor shaft and the launcher shaft,

characterized in that it further comprises a translational freewheel having an input end rotatably connected to the speed reduction assembly and an output end formed by a drive shaft;

- The launcher shaft being mounted movably in translation on the drive shaft by means of a helical link.

According to one embodiment, the output end is constituted by a drive shaft

In one embodiment, the launcher shaft surrounds the drive shaft.

[010] According to one embodiment, the starter comprises a base plate secured to the carcass, the inlet end of the freewheel having a sleeve having an outer annular face resting on an annular face of an opening in the base plate via a bearing allowing a rotation of the sleeve relative to the base plate so as to ensure a radial retention of the input end of the freewheel inside the starter. This improves the mechanical strength of the inlet of the freewheel by reducing bending and vibration of the section between the rollers and the gear and thus improving the life of the freewheel.

[011] In one embodiment, the drive shaft is supported on an inner annular face of the sleeve via a bearing allowing a rotation of the drive shaft relative to the sleeve, so as to ensure a radial holding of the drive shaft inside the starter.

[012] In this way, the drive shaft is held radially relative to the starter casing. The fact that the inlet of the freewheel and the output of the freewheel formed by one end of the drive shaft is held radially in the carcass makes it possible to have a freewheel held radially. This maintenance has the effect of increasing the life of a freewheel.

[013] In one embodiment, the starter comprises a base plate secured to the carcass, the input end of the free wheel having a flange extending transversely relative to an axis of rotation of the freewheel, this flange having a transverse face bearing against a transverse face of the base plate so as to ensure axial retention of the inlet end of the freewheel inside the starter.

[014] According to one embodiment, the drive shaft comprises an annular protuberance having a transverse face bearing on a transverse face of the flange opposite axially to the transverse face of the flange bearing against the base plate so as to maintain axial axis of the drive shaft inside the starter.

[015] In one embodiment, the drive member being located inside the starter housing, the drive shaft is mounted on a bearing of the starter having a bearing.

[016] In one embodiment, the drive member being located outside the starter housing, the starter shaft is mounted on a bearing of the starter, the drive shaft providing axial guidance of the starter. launcher tree.

[017] In one embodiment, the starter shaft has a blind bore having a shape complementary to a first cylindrical portion of the drive shaft, the drive shaft having a second cylindrical portion of diameter greater than that of the first cylindrical portion, the second cylindrical portion of the drive shaft having splines cooperating with grooves in the complementary shaped starter shaft to form the helical link.

[018] In one embodiment, the speed reducer assembly being an epicyclic gear comprising a ring gear fixed to the starter casing, a sun gear formed by an end of the rotor shaft, and a planet carrier comprising satellites meshing with one part with the crown and the other with the sun gear, the input end of the freewheel being secured in rotation with the planet carrier along the axis of the sun gear.

In one embodiment, one of the shafts of the rotor shaft and the drive shaft penetrates partly axially into the other shaft. [020] In one embodiment, the starter comprises a rolling member mounted between the two shafts to allow the shaft penetrating the other shaft to be carried by said other shaft.

[021] In one embodiment, the inlet end of the freewheel has a radial flange extending towards the axis of said freewheel, this radial flange being supported on the rotor shaft via a pad.

[022] In one embodiment, the launcher shaft comprises a torque limiter installed between a fork belonging to a starter displacement system and a portion of the launcher shaft carrying the drive member.

[023] According to one embodiment, the launcher shaft being made in two parts each carrying a radial flange, the torque limiter is formed by friction discs in contact with each other, these friction discs being alternately connected in rotation with one of the parts of the launcher shaft and a connecting member, a Belleville washer being located at one end of the stack of friction discs bearing against one of the radial collars.

[024] According to one embodiment, the connecting member has an annular recess delimited by two transverse walls inside which are positioned all friction discs and collars, the transverse walls of the connecting member being plated against the transverse faces of the flanges opposite to the stack of friction discs.

[025] In one embodiment, one of the parts of the launcher shaft carrying the drive member is devoid of helical grooves, helical grooves are formed only on the other part of the launcher shaft.

[026] The drive member is a drive pinion.

[027] BRIEF DESCRIPTION OF THE FIGURES

[028] The invention will be better understood on reading the description which follows and on examining the figures that accompany it. These figures are not data as illustrative but not limiting of the invention. They show :

[029] Figure 1 shows, in a longitudinal sectional view, a first embodiment of the starter according to the invention wherein the drive pinion is located inside the starter;

[030] Figure 2 shows, in a longitudinal sectional view, the front portion of a starter made according to a second embodiment wherein the drive gear is located outside the starter;

[031] Figure 3 shows, in a longitudinal sectional view, an alternative embodiment of the starter according to the invention wherein the starter shaft comprises a torque limiter;

[032] Figure 4 shows a detailed view of the starter torque limiter of Figure 3.

[033] The identical, similar, or similar elements, retain the same reference from one figure to another.

[034] DESCRIPTION OF EXAMPLES OF THE EMBODIMENT OF THE INVENTION

[035] Figure 1 shows an example of a starter 1 according to the invention in an active position. The starter 1 is of the "launcher" type. The starter 1 comprises an electric motor comprising firstly a rotor 3, also called armature, mounted on a rotor shaft 5 rotatable about its longitudinal axis X and secondly a stator 7, also called inductor installed around the rotor 3. The rotor shaft 5 has its rear end mounted in a bearing 5a of a bearing 1 1b at the rear of the starter 1 (called rear bearing).

[036] In the remainder of the description, the terms "front" and "rear" are, in the longitudinal direction of the axis X of the rotor shaft 5, such that a front face of an organ is the face facing towards a front bearing 1 1 a and the rear face is the face looking towards the rear bearing 1 1 b. [037] Behind the rotor 3, is mounted on the rotor shaft 5, a collector 9 comprising contact parts electrically connected to the rotor 5.

[038] The stator 7 is carried by a carcass 1 1 1. The stator 7 may comprise a plurality of permanent magnets. Alternatively, these magnets are replaced by electromagnets.

[039] The starter 1 further comprises a pinion 13 mounted to rotate with a launcher shaft 15. This launcher shaft 15 has a through hollow allowing the passage of a drive shaft 18. The launcher shaft 15 is linked to the drive shaft 18 via a helical link 20. The drive shaft 18 has its front end mounted on the front bearing 1 1a comprising one or more needle bearings. The launcher shaft 15 and the drive shaft 18 are coaxial along the X axis.

[040] The launcher shaft 15 is mounted on the drive shaft 18 so as to translate along the X axis relative to the drive shaft 18 from a rest position to an active position which corresponds to the position shown in Figure 1. In the active position, the pinion 13 is intended to drive in rotation a toothed wheel driving in rotation a crankshaft of a heat engine (not shown). In this case, the X axis of the drive shaft 18 is substantially the same as the X axis of the rotor shaft 5 but could be different, as in the examples described below.

[041] The starter 1 further comprises a free wheel 16 and a speed reduction unit 17 installed between the rotor shaft 5 and the drive shaft 18.

[042] Thus, the gear unit 17 comprises a first end, called the input end, connected to the rotor shaft 5 and another end, called the output end connected to the drive shaft 18 by the intermediate freewheel 16. In this case, the gear assembly 17 is an epicyclic gear comprising a fixed ring gear 171 connected to the carcass January 1, a sun gear 172 corresponding to the input end of the gear unit 17 formed by the front end of the rotor shaft 5, and a planet carrier 173 corresponding to the output end of the assembly gearbox comprising satellites 174 meshing with the ring gear 171 and with the sun gear 172. The satellites 174 each comprise an axis on which at least one plate 175 integral with the input end rotates. of the free wheel 16 along the axis of the sun gear 172.

[043] More specifically, the freewheel 16 has an inlet end meshing with the wheels 175 and an outlet end formed by the drive shaft 18. The freewheel 16 is held stationary in translation, in particular by resting on the carcass 1 1 1.

[044] For this purpose, the carcass 1 1 1 comprises a base plate 1 12 integral with the carcass 1 1 1 extending transversely to the axis X. This base plate 1 12 comes from material with the carcass 1 1 1. Alternatively, the base plate 1 12 is attached and fixed to the inner wall of the carcass 1 1 1. The base plate 1 12 takes the form of a plate having a through internal opening allowing the passage of a sleeve 161 of the free wheel 16.

[045] The input end of the free wheel 16 comprises the sleeve 161, a transverse flange 162 secured to the front of the sleeve 161, and a sleeve 163 of axial orientation integral with the outer periphery of the flange 162. This sleeve 163 forms, in combination with washers 164, a cage for the rollers 165 of the freewheel 16 cooperating with an annular protrusion 181 of the drive shaft 18.

[046] On the one hand, the sleeve 161 has an outer annular surface bearing on an annular face of an opening formed in the base plate 1 12 via a bearing 131. On the other hand, the sleeve 161 has an inner annular surface bearing on the outer face of the drive shaft 18 via a bearing 132. The pads 131, 132 are formed for example by metal rings thin. The pads 131, 132 allow a relative rotation of the two elements between which are installed said pads 131, 132. These pads 131, 132 could be replaced in an equivalent manner by ball bearings. In this way, the drive shaft 18 is held radially relative to the starter casing. The fact that the inlet of the freewheel and the outlet of the freewheel formed by one end of the drive shaft are held radially in the carcass makes it possible to have a freewheel held radially. This maintenance has the effect of increasing the life of a freewheel.

[047] The flange 162 has a rear transverse face resting on a front transverse face of the base plate 1 12. The annular protuberance 181 has a rear transverse face bearing on a front transverse face of the flange 162.

[048] Thus, in such a configuration, the radial retention of the inlet end of the freewheel 16 is ensured by the inner annular face of the base plate 1 12 against which the sleeve 161 is supported by means of pad 131. The axial end of the inlet end of the freewheel 16 is provided by the rear transverse face of the flange 162 bearing against the front transverse face of the base plate 1 12.

[049] The radial maintenance of the output of the freewheel 16 is provided on the one hand by the front bearing 11a within which is installed the front end of the drive shaft 18; and on the other hand by the annular face of the base plate 1 12 against which the rear end of the drive shaft 18 is supported by means of the pad 132, the sleeve 161, and the pad 131. The axial retention of the output of the free wheel 16 is ensured by the transverse face of the annular protuberance 181 of the drive shaft 18 bearing against the base plate 1 12 via the flange 162.

[050] Moreover, the inlet end of the free wheel 16 has at its rear end a radial flange 166 extending inwardly of the sleeve 161. This radial flange 166 is supported, via a bearing 133, on a section of the rotor shaft 5 having a smaller diameter than that of the section of the drive shaft 18 forming the sun gear 172 of the train epicyclic.

[051] The drive shaft 18 penetrates axially partially inside the rotor shaft 5 via a bore 151, or vice versa. As shown in FIG. 3, the outer face of the rotor shaft 5 can cooperate with the face annular bore 151 formed in the drive shaft 18 through a bearing 134 fitted on the end of the rotor shaft 5. The fork 27 is installed between two radial flanges 152, 153 of the throwing shaft 15.

[052] Figure 2 shows a second embodiment of the starter 1 in which the pinion 13 is located outside the carcass 1 1 1. According to this embodiment, the launcher shaft 15 mounted on the front bearing 1 1 has passed through the carcass 1 1 1 through an opening 1 13. To ensure the axial guidance of the launcher shaft 15, said launcher shaft 15 has in its front part. a blind bore 154 having a shape complementary to a cylindrical portion 182 of the drive shaft 18. The drive shaft 18 also has a cylindrical portion 183 of greater diameter than the first portion 182. To form the helical connection with the launcher shaft 15, the cylindrical portion 183 has splines 184 clearly visible in Figure 3 cooperating with grooves in the throwing shaft 15 of complementary shape, or vice versa.

[053] As previously, the fork 27 is installed between two radial flanges 152, 153 of the launcher shaft 15. The free wheel 16 is held radially and axially in the same manner as in the structure of the starter of FIG.

[054] According to an embodiment shown in Figures 3 and 4, the launcher shaft 15 comprises a torque limiter 200 installed between the fork 27 and a portion of the launcher shaft 15 carrying the pinion 13. In this case, the launcher shaft 15 is made in two parts 155 and 156 each carrying a radial flange 157 and 158. The fork 27 is installed between the radial flange 153 and the flange 157. As can be seen in Figure 4, the torque limiter 200 is formed by friction discs 201, 202 in contact with each other. These friction discs 201, 202 are alternately connected in rotation with the portion 155 of the launcher shaft 15 and a connecting member 203. For this purpose, the friction discs 201, 202 comprise, for example, radially extending tabs cooperating with each other. with grooves of complementary shape formed in the part with which the discs 201, 202 are connected in rotation. A Belleville type washer 204 is located at one end of the stack of disks 201, 202. Only the portion 155 of the launcher shaft 15 has helical grooves to form the helical connection with the drive shaft 18. The portion 156 carrying the drive pinion 13 comprises by helical grooves, to allow its rotation in case of overtorque independently of the portion 155 as explained below.

[055] The connecting member 203 has an annular recess delimited by two transverse walls inside which are positioned all of the friction discs 201, 202 and the collars 157 and 158. The transverse walls of the body of link 203 are pressed against transverse faces of the flanges 157, 158 opposite to the stack of the friction discs 201, 202. The connecting member 203 is configured so that the washer 204 bearing on the flange 158 exerts a force of direction of the stack of disks 201, 202; while a reaction force is exerted on the side of the flange 157 so as to compress the set of discs 201, 202. Of course, the torque limiter 200 could also be used with the starter 1 with an internal gear of FIG. 1.

[056] In normal operation, the two parts 155, 156 are rotatably connected to each other due to the compression of the friction discs 201, 202 with each other. In case of overtorque, the friction discs 201, 202 will slide on each other, so that the portion 156 of the launcher shaft 15 will rotate on the shaft 18 without causing the portion 155, which will allow to reduce the risk of breakage.

[057] As a variant, the gear unit 17 may be any other type of gearbox. For example, the gear unit 17 could comprise two gear wheels, one of which is secured to the rotor shaft 5 and the other of the input end of the freewheel 16. In this example, the two axes of the rotor shaft 5 and the drive shaft 15 are offset in parallel. According to another example, the reduction system 17 may be geared left or gear concurrent. In these two types of reduction system 17, the axis of the drive shaft 15 and the axis of the rotor shaft 5 are respectively concurrent or neither parallel nor concurrent. [058] The starter 1 further comprises a system for moving the launcher shaft 15 to pass the pinion 13 from its rest position to its active position and vice versa. This displacement system comprises a contactor 23 and the fork 27 described below.

[059] A group of brushes 19a and 19b is provided for the power supply of the rotor winding 3. At least one of the brushes 19b is electrically connected to the ground of the starter 1, for example the carcass 1 1 1, and at least another of the brushes 19a is electrically connected to an electrical terminal 21a of the contactor 23, for example via a wire 22. The brushes 19a and 19b rub on the collector 9 when the rotor 3 is rotating. The starter 1 may comprise a plurality of brushes.

[060] The switch 23 comprises, in addition to the terminal 21 has connected to the brush 19a, a terminal 21b intended to be connected via an electrical connection element to a positive power supply V + of the vehicle, including a battery, not shown.

[061] The switch 23 comprises a movable contact plate 25 for electrically connecting the terminals 21b and 21a to supply the electric motor. The switch 23 is also able to actuate the fork 27 to move the launcher shaft 15 and the pinion 13 from the rest position to the active position and vice versa. For this purpose, the contactor 23 also comprises a movable core 29, a fixed core 28, a fixed coil 26, a movable control rod 24 and a movable rod 241.

[062] The control rod 24 passes through the fixed core 28 which serves as a guide. This control rod 24 has its front end bearing on the fixed core 28 and its rear end attached to the contact plate 25. The control rod 24 is subjected to the action of a compressed contact spring (not referenced) between a shoulder of the control rod 24 and the contact plate 25 to ensure electrical contact of the contact plate with the terminals 21a and 21b when the movable core 29 is in a so-called magnetized position.

[063] The movable rod 241 is fixed at its front end to the fork 27. When the coil 26 is energized, the movable core 29 is attracted to the fixed core 28 to be in magnetized position. Its displacement simultaneously drives the movable rod 241, the contact plate 25 and the control rod 24 towards the rear. The movable rod 241 is further subjected to a tooth against tooth spring 291 housed inside the movable core 29 and surrounding the movable rod 241. This tooth against tooth spring 291 is supported on a front shoulder of the movable rod 241 and a rear shoulder of the movable core 29. This tooth against tooth spring 291 is compressed when the contact plate 25 moves towards the terminals 21 b, 21 a and when the fork 27 can not advance the pinion 13. The fork 27 can not advance when the pinion 13 is blocked in translation along the X axis in the direction of the toothed wheel in connection with the crankshaft by one or more teeth of said toothed wheel. This blocked state is called the "tooth to tooth position". The compression of the tooth against tooth spring 291 absorbs shocks while applying a force on the fork 27 transmitted to the pinion 13 to the engagement position.

[064] The switch 23 further comprises a return spring 290, bearing on the fixed coil 26 and the movable core 29 to urge it forward to its rest position and simultaneously move the fork 27 to the pinion 13 is in the rest position.

Claims

1. Starter (1) for a combustion engine of a motor vehicle comprising

an electric motor having a stator (7) and a rotor (3) mounted on a rotor shaft (5),

- A launcher shaft (15) movable in translation carrying a drive member (13) adapted to move from a rest position in which the drive member (13) is disengaged from a rotary element connected to the engine crankshaft. thermal device at an active position in which the driving member (13) is intended to rotate the rotary element connected to the crankshaft of the heat engine,

- a speed reducer assembly (17) interposed between the rotor shaft (5) and the launcher shaft (15),

characterized in that it further comprises

- a freewheel (16) immobile in translation having an inlet end rotatably connected to the speed reducing assembly (17) and an outlet end consisting of a drive shaft (18),

- The launcher shaft (15) being mounted movably in translation on the drive shaft (18) via a helical link.

2. Starter according to claim 1, characterized in that it comprises a base plate (1 12) integral with the carcass (January 1), the inlet end of the free wheel (16) having a sleeve ( 161) having an annular outer surface bearing on an annular face of an opening in the base plate (1 12) via a bearing (131) allowing a rotation of the sleeve (161) relative to the base plate (1 12) so as to provide radial retention of the inlet end of the free wheel (16) inside the starter.

3. Starter according to claim 2, characterized in that the drive shaft (18) is supported on an inner annular face of the sleeve (161) by means of a bearing (132) allowing a rotation of the drive shaft (18) relative to the sleeve (161) so as to ensure radial retention of the drive shaft (18) inside the starter.

4. Starter according to one of claims 1 to 3, characterized in that it comprises a base plate (1 12) integral with the carcass (1 1 1), the inlet end of the freewheel having a flange (162) extending transversely with respect to an axis of rotation (X) of the free wheel (16), this flange (162) having a transverse face bearing against a transverse face of the base plate (1 12) so as to ensure an axial retention of the inlet end of the freewheel (16) inside the starter.

5. Starter according to claim 4, characterized in that the drive shaft (18) comprises an annular protuberance (181) having a transverse face bearing on a transverse face of the flange (162) opposite axially to the transverse face of the flange bearing against the base plate (1 12) so as to ensure axial retention of the drive shaft (18) inside the starter.

Starter according to one of Claims 1 to 5, characterized in that the drive member (13) is located inside the starter casing (1 1 1), the drive shaft ( 18) is mounted on a bearing (1 1 a) of the starter having a bearing.

7. Starter according to one of claims 1 to 6, characterized in that, the driving member (13) being located outside the starter casing (1 1 1), the starter shaft (15) ) is mounted on a bearing of the starter, the drive shaft (18) providing axial guidance of the launcher shaft (5).

8. Starter according to claim 7, characterized in that the starter shaft (15) has a blind bore (154) having a shape complementary to a first cylindrical portion (182) of the drive shaft (18). , the drive shaft (18) having a second cylindrical portion (183) of greater diameter than the first cylindrical portion (182), the second cylindrical portion (183) of the shaft driving device comprising grooves cooperating with grooves formed in the lapping shaft (15) of complementary shape to form the helical connection.

9. Starter according to one of claims 1 to 8, characterized in that the assembly (17) speed reducer being an epicyclic gear comprising a ring gear (171) fixed to the starter casing, a sun gear (172) formed by one end of the rotor shaft (5), and a planet carrier having satellites meshing on the one hand with the ring gear and on the other hand with the sun gear (172), the input end of the freewheel ( 16) being secured in rotation with the planet carrier along the axis of the sun gear (172).

10. Starter according to one of claims 1 to 9, characterized in that one of the shaft of the rotor (5) and the drive shaft (18) penetrates axially into the other shaft.

1 1. Starter according to claim 10, characterized in that it comprises a rolling member (132) mounted between the two shafts (5, 18) to allow the shaft penetrating into the other shaft to be carried by said other shaft.

12. Starter according to claim 2, characterized in that the inlet end of the freewheel (16) comprises a radial flange (166) extending towards the axis of said freewheel (16), this radial flange. (166) being supported on the rotor shaft (5) via a bearing (133).

13. Starter according to one of claims 1 to 12, characterized in that the launcher shaft (15) comprises a torque limiter (200) installed between a fork (27) belonging to a starter movement system and a part the launcher shaft (15) carrying the driving member.

Starter according to claim 13, characterized in that the starter shaft (15) being made in two parts (155, 156) each carrying a radial flange (157, 158), the torque limiter (200) is formed by of the friction discs (201, 202) in contact with each other, said friction discs (201, 202) being rotatably connected to one of the parts (155, 156) of the throwing shaft (15) and an element linkage (203), a washer (204) of Belleville type being located at one end of the stack of friction discs (201, 202) bearing against one of the radial collars (157, 158).

15. Starter according to claim 14, characterized in that the connecting member (203) has an annular recess defined by two transverse walls inside which are positioned all the friction discs (201, 202) and the flanges (157, 158), the transverse walls of the connecting member (203) being pressed against the transverse faces of the flanges (157, 158) opposite to the stack of friction discs (201, 202).

16. Starter according to claim 14 or 15, characterized in that one of the parts (156) of the launcher shaft (15) carrying the drive member (13) is devoid of helical grooves, helical grooves are provided only on the other part (155) of the throwing shaft (15).