STARTER DEVICE AND INTERNAL COMBUSTION ENGINE HAVING THE SAME

Description

[0001] The invention relates to a starter device according to the preamble of Claim 1. The invention relates in particular to an internal combustion engine having such a starter device.

[0002] Starter devices of this type are known for example from US 9 062 646 B2, CN 103244570 B or US 5 067 357 A. In these starter devices, a solenoid-operable lever mechanism is used in order to bring a pinion wheel of the starter device in an axial actuation movement out of a disengaged retracted position into engagement with a ring gear of an internal combustion engine. In particular when the pinion wheel does not immediately mesh with the ring gear, which can be the case for example in a so-called tooth-on-tooth position, the pinion wheel has to be again retracted by way of the lever mechanism in order to be able to undertake a further engagement attempt. Because of burrs and/or surface irregularities present on internal toothings of the starter devices caused by the production there is the risk that the starter device in such a tooth-on-tooth position jams and seizes up, as a result of which the pinion wheel cannot be retracted into the retracted position. To rectify these problems it has been usual in the past to remove the causal burrs and/or surface irregularities by means of a mechanical reworking such as for example grinding. However, this reworking involves additional costs which with a view to the production costs for a starter device are undesirable.

[0003] The patent US 7 712 388 B2 is one example, which discloses the preamble of independent claim 1.

[0004] The object of the invention therefore lies in providing an improved or at least another embodiment of a starter device. In particular, an internal combustion engine having such a starter device is to be stated.

[0005] In the present invention, this object is solved in particular through the subjects of the independent claims. Advantageous embodiments are subject of the dependent claims and of the description.

[0006] The basic idea of the invention lies in constructively adapting the internal toothings of the starter device so that burrs and/or regions with surface irregularities present on the same cannot, during the course of the actuation movement and of the operation of the starter device, come into contact with the internal toothings so that a jamming is excluded.

[0007] To this end, a starter device for cranking an internal combustion engine is proposed, which is equipped with a driveshaft defining a longitudinal centre axis along its main extension, which in turn comprises an external toothing arranged in particular on an outer circumferential surface of the driveshaft. Practically, the driveshaft is configured round-cylindrically and/or driveable round about the longitudinal centre axis by way of an electric starter motor of the starter device. Furthermore, the starter device has a pinion shaft which practically defines a pinion shaft longitudinal centre axis along its main extension, which has a pot-like driveshaft receptacle, in which the driveshaft or at least a portion of the same is received. Practically, the pinion shaft and the starter shaft are oriented coaxially to one another and/or mounted on one another so as to be rotationally and longitudinally adjustable by way of a suitable sliding bearing, which makes possible in particular a mounting free of coaxiality errors, which favours a safe operation of the starter device. Furthermore, the starter device has a transmission device, which is equipped for transmitting a torque from the driveshaft to the pinion shaft. The transmission device comprises an internal toothing arranged in particular on an inner circumferential surface of the transmission device, which can be meshed, i.e. brought into engagement with the said external toothing of the driveshaft. Furthermore it is provided that the transmission device and the pinion shaft are longitudinally adjustable axially with respect to the longitudinal centre axis jointly within the scope of an actuation movement, with respect to the driveshaft, between an engaged position, in which the said internal toothing and the said external toothing positively engage into one another for the torque transmission, and a basic position axially spaced apart thereto, in which the internal toothing and the external toothing are disengaged.

[0008] In order to avoid a jamming of the starter device during the course of the actuation movement and in the engaged position, i.e. during the operation of the starter device, it is provided that the external toothing has teeth which comprise tip edges arranged in the region of a tooth tip of a tooth, which in the engaged position and in the actuation movement are spaced apart with respect to the teeth of the internal toothing and/or that the internal toothing has teeth which comprise tip edges arranged for example in the region of a tooth tip of a tooth, which tip edges are spaced apart in the engaged position and in the actuation movement with respect to the teeth of the external toothing. Because of this, the tip edges in the engaged position and in the actuation movement are thus contact-free with respect to the internal toothing or the external toothing. During tests it has been established that because of this a contact between burrs and/or surface irregularities of the external toothing which are usually present on the tip edges of the teeth of the external toothing that are usually present there as a consequence of the manufacturing process chosen for the external toothing of the driveshaft, with the internal toothing of the transmission device can be prevented or vice versa. In this way, a jamming of the toothings of the starter device can be prevented so that the actuation movement of transmission device and pinion shaft is smooth and reliably repeatable and the comfort in utilising the starter device is increased. Apart from this, the mechanical removal of the burrs and/or surface irregularities on the external toothing of the driveshaft that has been customary in the past can be omitted so that a cost advantage is additionally achieved.

[0009] According to the invention, the toothing profile of the external toothing or of the teeth of the external toothing is an involute profile and the toothing profile of the internal toothing or of the teeth of the internal toothing is a trapezoidal profile. In the invention, the term "involute profile" is to mean in particular a toothing profile in which a respective toothing comprises involute teeth or teeth that are configured involute at least in portions. In the invention, the term "trapezoidal profile" is to practically mean a toothing profile in which a respective toothing comprises teeth configured trapezoidal, i.e. such teeth which have a trapezoidal tooth cross-sectional profile. By way of these proposed different toothing profiles, any contact between burrs and/or surface irregularities present on the external toothing of the driveshaft and the internal toothing can be reliably prevented. An external toothing of the driveshaft with involute profile can be relatively cost-effectively produced for example by rolling. Furthermore, an internal toothing of the pinion shaft with trapezoidal profile, convex profile, spline profile or serration profile can be relatively cost-effectively produced for example by broaching. Because of this, a starter device that can be cost-effectively produced on the whole is stated, whose internal toothings cannot jam. According to an opposite solution, by way of which the same advantages can be achieved, it can be alternatively provided that the toothing profile of the external toothing or the teeth of the external toothing is realised by a trapezoidal profile, a convex profile, a spline profile or a serration profile and the toothing profile of the internal toothing or of the teeth of the internal toothing is realised by an involute profile.

[0010] Practically, tip lands of these teeth are configured flat or curved. Because of this, an involute tooth flank in the said engaged position and/or during the course of the actuation movement is always in contact with a flat or convex tooth flank. In the invention, a tooth flank curved in an involute manner is to practically mean a tooth flank that is realised in the manner of an involute. In the invention, a tooth flank configured flat is to practically mean such a tooth flank which defines a plane and lies within the said plane. Practically, a flat tooth flank differs from this plane merely within the scope of production-related tolerances. In the invention, a convexly curved tooth flank is to practically mean a tooth flank curved away from the tooth body. According to an opposite solution, by way of which the same advantages can be achieved, it can be alternatively provided that the tooth flanks of the external toothing are configured flat or convex and the tooth flanks of the internal toothing are configured so as to be convex. During further tests it has been established that by way of these specific flank pairings or the proposed flank configurations a contact between burrs and/or surface irregularities present on the external toothing of the driveshaft can be prevented.

[0011] It is practical when the tooth flanks are formed by tooth flank surfaces which extend between a said tip edge and a root surface or a root edge of a respective tooth. The entire tooth surface of a tooth can be composed of two opposite tooth flanks, a tip land connecting the same to one another and root surfaces. Because of this, the tooth flank surfaces are curved in an involute manner or configured flat or convexly curved, as a result of which the subject flank configuration is limited to the tooth flank surfaces of the teeth.

[0012] Furthermore, it can be practically provided that the said tooth flank surfaces form contact surfaces. By way of the contact surfaces, the teeth of the external toothing can be planned to be contactable or contacted with the teeth of the internal toothing for transmitting the torque. In other words, such tooth flank surfaces are to mean those surface regions of a tooth surface of a tooth of one of the said toothings which actually bring about the transmission of the torque between the toothings. Thus, the subject flank configuration is limited to the actually effective tooth flank surfaces or contact surfaces. This means in particular that the tooth flank surfaces or the contact surfaces can have an involute curvature, a flat configuration or a convex curvature.

[0013] Practically, the starter device comprises a pinion wheel that is non-rotatably arranged on the pinion shaft, which pinion wheel in the engaged position is in engagement with a ring gear of the internal combustion engine so that torque from the starter device to the internal combustion engine can be transmitted in order to crank the internal combustion engine. Further practically, the said transmission device, besides the internal toothing, also has a clutch device, by way of which the transmission device can be frictionally connected to the pinion shaft. For example, the clutch device can be realised in the form of a freewheel clutch.

[0014] According to a further basic idea of the invention, an internal combustion engine having a starter device equipped for cranking the internal combustion engine according to the preceding description and having a ring gear is provided, wherein the pinion shaft of the starter device is assigned a pinion wheel that is non-rotatable with respect to the pinion shaft, which pinion wheel is equipped in order to mesh with the ring gear in order to transmit torque from the starter device to the internal combustion engine. Because of this, an advantageous internal combustion engine having a smoothly-operating and reliably actuatable starter device is stated, as a result of which the comfort in utilising the internal combustion engine, in particular with a view to the reliability is increased.

[0015] In summary it remains to be noted: The present invention practically relates to a starter device for cranking an internal combustion engine with a driveshaft comprising an external toothing with a pinion shaft comprising a driveshaft receptacle, in which the driveshaft is slidably received, having a transmission device equipped for transmitting a torque from the driveshaft to the pinion shaft, which transmission device comprises an internal toothing, wherein the transmission device and the pinion shaft, in an actuation movement jointly engage into one another are adjustable between an engaged position, in which the internal toothing and the external toothing engage into one another, and a disengaged basic position. It is substantial for the invention that the external toothing and the internal toothing have different toothing profiles. The invention relates in particular to an internal combustion engine having such a starter device.

[0016] Further important features and advantages of the invention are obtained from the dependent claims, from the drawings and from the associated figure description by way of the drawings.

[0017] It is to be understood that the features mentioned above and still to be explained in the following cannot only be used in the respective combination stated but also in other combinations or by themselves without leaving the scope of the appended claims.

[0018] A preferred embodiment of the invention is shown in the drawings and explained in more detail in the following description, wherein same reference numbers relate to same or similar or functionally same components.

[0019] It shows, in each case schematically

Fig. 1

a part sectional view of a preferred embodiment of a starter device according to the invention and

Fig. 2

the starter device from Fig. 1 in a sectional view according to a section line II-II with a view in the direction of arrows II drawn-in in Fig. 1.

[0020] Fig. 1 and 2 show a preferred embodiment of a starter device marked in its entirety with the reference number 1 for cranking an internal combustion engine 2 which in Fig. 1 is merely symbolised by a ring gear 27 indicated in sections, which serves for transmitting a torque 29 provided by the starter device 1 into the internal combustion engine 2.

[0021] According to Fig. 1, the starter device 1 has a round-cylindrical driveshaft 4, which in its main extension defines a longitudinal centre axis 3 and which can be driven by way of an electric starter motor 28 of the starter device 1 round about the longitudinal centre axis 3. The driveshaft 4 is exemplarily embodied as solid round shaft and has a circumferential external toothing 5 arranged on a circumferential driveshaft lateral surface of the driveshaft 4 consisting of a multiplicity of teeth 12. The external toothing 5 is embodied as helical toothing. The teeth 12 of the external toothing 5 comprise curved tip lands 30 defining a tip circle of the external toothing 5 and curved root surfaces 32 defining a root circle of the external toothing 5. The teeth 12 of the external toothing 5 furthermore comprise, viewed in a circumferential direction about the longitudinal centre axis 3, two opposite tooth flanks 13, which, emanating from a tip land 30 of a respective tooth 12 extend as far as to a root surface 32 of a respective tooth 12. The tip lands 30 and the tooth flanks 13 are each separated by a tip edge 18 that is substantially parallel with respect to the longitudinal centre axis 3. The tip edges 18 can be formed by pointed edges, tip curves or tip chamfers. Further, the root surfaces 32 and the tooth flanks 13 are each separated by a root edge 22 which is substantially parallel with respect to the longitudinal centre axis 3. The root edges 22 can be formed by root curves, root chamfers or undercuts.

[0022] Furthermore, the starter device 1 according to Fig. 1 has a round-cylindrical pinion shaft 6, which in its main extension defines a pinion shaft longitudinal centre axis 34 and which comprises a pot-like driveshaft receptacle 7, in which the driveshaft 4 is coaxially received. Here, the pinion shaft 6 is guided on the driveshaft 4 so as to be longitudinally adjustable with respect to the longitudinal centre axis 3 or the pinion shaft longitudinal centre axis 34. In order to realise the said longitudinal adjustability or guidance it is exemplarily provided that the driveshaft 4 and the pinion shaft 6 have or form a suitable sliding bearing in the region of the driveshaft receptacle 7, which sliding bearing in particular makes possible a mounting free of coaxiality defects, so that the driveshaft 4 does not angularly tilt relative to the pinion shaft 6 by an unsymmetrical force loading during the course of an adjusting movement 10 still to be explained in the following and/or during the operation of the starter device 1. Furthermore, the starter device 1 has a transmission device 8 arranged on the pinion shaft 6, which is equipped for transmitting the torque 29 from the driveshaft 4 to the pinion shaft 6. The transmission device 8 for this purpose exemplarily comprises a friction clutch device 38 interacting with the pinion shaft 6 in a frictionally connected manner, by way of which the torque 29 can be transmitted from the transmission device 8, in particular frictionally, to the pinion shaft 6. The friction clutch device 38 can be realised for example as a freewheel device. The transmission device 8, furthermore, comprises an internal toothing 9 formed of a multiplicity of teeth 14 arranged on an inner circumferential surface of the transmission device 8, which internal toothing 9 can be brought into engagement with the said external toothing 5 of the driveshaft 4. The teeth 14 of the internal toothing 9 comprise curved tip lands 31 defining a tip circle of the internal toothing 9 and curved root surfaces 33 defining a root circle of the internal toothing 9. The teeth 14 of the internal toothing 9, furthermore, comprise, viewed in a circumferential direction about the longitudinal centre axis 3, two opposite tooth flanks 15 which, originating from a tip land 31 of a respective tooth 14 of the internal toothing 9 extend as far as to a root surface 33 of a respective tooth 14 of the internal toothing 9. These tip lands 31 and these tooth flanks 15 are each separated by a tip edge 19 of the internal toothing 9 which, with respect to the longitudinal centre axis 3, is substantially parallel. The tip edges 19 can be formed by pointed edges, tip curves or tip chamfers. Furthermore, these root surfaces 33 and these tooth flanks 15 are each separated by a root edge 23 of the internal toothing 9, which with respect to the longitudinal centre axis 3 is substantially parallel. The root edges 23 can be formed by root curves, root chamfers or undercuts. Furthermore, the pinion shaft 6 of the starter device 1 is assigned a pinion wheel 26 at an axial end protruding over a housing of the starter device 1 facing away from the electric starter motor 28, which pinion wheel 26 is non-rotatably fixed on the pinion shaft 6. The pinion wheel 26 is equipped in order to mesh with the said ring gear 27 of the internal combustion engine 2 in order to transmit the torque 29 from the starter device 1 to the internal combustion engine 2.

[0023] In order to move the starter device 1 out of a rest position into an operating position, in which torque 29 is transmitted from the starter device 1 to the internal combustion engine 2, it is provided that the transmission device 8 and the pinion shaft 6 are axially adjustable jointly for example by way of an actuating device 37 formed from a lever 35 and an electromagnetic actuation device 36 during the course of an actuation movement 10, which in Fig. 1 is indicated by a double arrow, with respect to the driveshaft 4 between an engaged position 11, in which the internal toothing 9 meshes with the external toothing 5, and a disengaged basic position spaced axially therefrom. In the engaged position 11, the torque 29 provided on the driveshaft 4 by the electric starter motor 28 is transmitted from the driveshaft 4 by way of the transmission device 8 to the pinion shaft 6, wherein the torque 29 by way of the pinion wheel 26 arranged on the pinion shaft 6 is transmitted to the ring gear 27 of the internal combustion engine 2.

[0024] In order to prevent that the starter device 1 in the engaged position 11 and/or during the course of the actuation movement 10 jams because of burrs and/or surface irregularities that remain on the tip edges 18 of the driveshaft 4 due to the manufacture, as a result of which the transmission device 8 and the pinion shaft 6 cannot, in particular, be retracted into the basic position, it is exemplarily provided that the tip edges 18 of the teeth 12 of the external toothing 5 are configured so that these, in the engaged position 11 and in the adjusting movement 10, are spaced apart and free of contact with respect to the teeth 14 of the internal toothing 9, in particular with respect to the tooth flanks 15 of the teeth 14 of the internal toothing 9 or tooth flank surfaces 17 of the tooth flanks 15 of the teeth 14 of the internal toothing 9. For this purpose, the external toothing 5 and the internal toothing 9 comprise in particular different toothing profiles 24, 25.

[0025] According to the invention, it is provided, furthermore, that as toothing profile 24 of the teeth 12 of the external toothing 5 an involute profile and as toothing profile 25 of the teeth 14 of the internal toothing 9 a trapezoidal profile is provided. Because of this, the external toothing 5 has curved in an involute manner tooth flanks 13, while the tooth flanks 15 of the internal toothing 9 are flat and configured angular with respect to the tip land 31. As a further example, which is not part of the invention, it is also conceivable that the toothing profile 25 of the internal toothing 9 is embodied as an involute profile and that the toothing profile 24 of the external toothing 5 is realised as trapezoidal profile. Because of this, an involute tooth flank 13 is always in contact with a tooth flank 15 configured flat in the said engaged position 11 and during the course of the actuation movement 10. During tests it was established that by way of these flank configurations a contact between the tip edges 18 of the external toothing 5 and of the internal toothing 9, for example the tooth flank 15 of the internal toothing 9, can be prevented, as a result of which a jamming of the starter device 1 in the engaged position 11 and during the course of the actuation movement 10 on account of the existing burrs and/or surface irregularity is prevented. According to a further example, which is not part of the invention, a variant indicated by way of dotted lines in Fig. 2 it can be provided that the tooth flanks 13 of the external toothing 5 are curved in an involute manner and tooth flanks 15 of the internal toothing 9 are convexly curved, as a result of which the described advantages are likewise achievable. According to a further example, which is not part of the invention and which is not illustrated, which realises an opposite solution, it can be provided that the internal toothing 9 comprises teeth 14 with tip edges 19 which in the engaged position 11 and in the actuation movement 10 are spaced apart with respect to the teeth 12 of the external toothing 5.

[0026] Purely exemplarily it is provided that the said tooth flanks 13 of the external toothing 5 and the said tooth flanks 15 of the internal toothing 9 are formed by tooth flank surfaces 16, 17 which extend between a respective tip edge 18, 19 and a respectively root edge 22, 23 of a respective tooth 12, 14. Here, the said tooth flank surfaces 16, 17 form contact surfaces by way of which the teeth 12 of the external toothing 5 are actually contacted with the teeth 14 of the internal toothing 9 for transmitting the torque 29. The proposed flank configuration is thereby restricted to the contact surfaces of the teeth 12, 14 of the two toothings 5, 9 actually involved in the torque transmission, so that an involute curvature, a flat configuration or a convex curvature is merely provided in these regions.

Claims

1. A starter device (1) for cranking an internal combustion engine (2)

- having a driveshaft (4) defining along its main extension a longitudinal centre axis (3), which driveshaft (4) comprises an external toothing (5),

- having a pinion shaft (6) which comprises a pot-like driveshaft receptacle (7) in which the driveshaft (4) is received,

- having a transmission device (8) equipped for transmitting a torque (29) from the driveshaft (4) to the pinion shaft (6), which transmission device (8) comprises an internal toothing (9) which can be meshed with the external toothing (5),

- wherein the transmission device (8) and the pinion shaft (6), in an actuation movement (10) are jointly axially adjustable with respect to the longitudinal centre axis (3) between an engaged position (11), in which the internal toothing (9) and the external toothing (5) engage into one another for transmitting the torque (29), and a basic position axially spaced apart thereto, in which the internal toothing (9) and the external toothing (5) are disengaged,

- wherein the external toothing (5) comprises teeth (12) with tip edges (18), which in the engaged position (11) and in the actuation movement (10) are spaced apart with respect to the teeth (14) of the internal toothing (9), and/or

- wherein the internal toothing (9) comprises teeth (14) with tip edges (19), which in the engaged position (11) and in the actuation movement (10) are spaced apart with respect to the teeth (12) of the external toothing (5), wherein a toothing profile (25) of the teeth (14) of the internal toothing (9) is realised by a trapezoidal profile;

characterised in that
a toothing profile (24) of the teeth (12) of the external toothing (5) is realised by an involute profile.

2. The starter device (1) according to Claim 1,
characterised in that

- the teeth (12) of the external toothing (5) and the teeth (14) of the internal toothing (9) comprise tooth flanks (13, 15),

- the tooth flanks (13) of the external toothing (5) are configured involute and the tooth flanks (15) of the internal toothing (9) flat.

3. The starter device (1) according to Claim 2, characterised in that
the tooth flanks (13) of the external toothing (5) and/or the tooth flanks (15) of the internal toothing (9) are formed by tooth flank surfaces (16, 17) which extend between the tip edges (18, 19) of a tooth (12, 14) and a root surface (32, 33) or a root edge (22, 23) of a tooth (12, 14).

4. The starter device (1) according to Claim 3,
characterised in that
the tooth flank surfaces (16, 17) form contact surfaces via which the teeth (12) of the external toothing (5) can be contacted or are contacted in the engaged position (11) with the teeth (14) of the internal toothing (9) for transmitting the torque (29).

5. An internal combustion engine (2) having a starter device (1) realised according to the Claims 1 to 4 for cranking the internal combustion engine (2) and having a ring gear (27), wherein the pinion shaft (6) of the starter device (1) is assigned a pinion wheel (26) that is non-rotatable with respect to the pinion shaft (6), which pinion wheel (26) is equipped for meshing with the ring gear (27) in the engaged position (11), in order to transmit torque (29) from the starter device (1) to the internal combustion engine (2).

Ansprüche

1. Startervorrichtung (1) zum Anlassen eines Verbrennungsmotors (2),

- die eine Antriebswelle (4) aufweist, die entlang ihrer Haupterstreckung eine Längsmittelachse (3) definiert, wobei die Antriebswelle (4) eine Außenverzahnung (5) umfasst,

- die eine Ritzelwelle (6) aufweist, die eine topfartige Antriebswellenaufnahme (7) umfasst, in der die Antriebswelle (4) aufgenommen ist,

- die eine Getriebevorrichtung (8) aufweist, die dazu eingerichtet ist, ein Drehmoment (29) von der Antriebswelle (4) auf die Ritzelwelle (6) zu übertragen, wobei die Getriebevorrichtung (8) eine Innenverzahnung (9) umfasst, die mit der Außenverzahnung (5) in Eingriff gebracht werden kann,

- wobei die Getriebevorrichtung (8) und die Ritzelwelle (6) bei einer Betätigungsbewegung (10) gemeinsam axial in Bezug auf die Längsmittelachse (3) zwischen einer Eingriffsstellung (11), in der die Innenverzahnung (9) und die Außenverzahnung (5) ineinander eingreifen, um das Drehmoment (29) zu übertragen, und einer dazu axial beabstandeten Grundstellung, in der die Innenverzahnung (9) und die Außenverzahnung (5) außer Eingriff sind, verstellbar sind,

- wobei die Außenverzahnung (5) Zähne (12) mit Spitzenkanten (18) umfasst, die in der Eingriffsstellung (11) und bei der Betätigungsbewegung (10) in Bezug auf die Zähne (14) der Innenverzahnung (9) beabstandet sind, und/oder

- wobei die Innenverzahnung (9) Zähne (14) mit Spitzenkanten (19) umfasst, die in der Eingriffsstellung (11) und bei der Betätigungsbewegung (10) in Bezug auf die Zähne (12) der Außenverzahnung (5) beabstandet sind,

wobei ein Verzahnungsprofil (25) der Zähne (14) der Innenverzahnung (9) durch ein Trapezprofil realisiert ist;

dadurch gekennzeichnet, dass ein Verzahnungsprofil (24) der Zähne (12) der Außenverzahnung (5) durch ein Evolventenprofil realisiert ist.

2. Startervorrichtung (1) nach Anspruch 1,
dadurch gekennzeichnet, dass

- die Zähne (12) der Außenverzahnung (5) und die Zähne (14) der Innenverzahnung (9) Zahnflanken (13, 15) umfassen,

- die Zahnflanken (13) der Außenverzahnung (5) evolventisch und die Zahnflanken (15) der Innenverzahnung (9) flach ausgebildet sind.

3. Startervorrichtung (1) nach Anspruch 2,
dadurch gekennzeichnet, dass
die Zahnflanken (13) der Außenverzahnung (5) und/oder die Zahnflanken (15) der Innenverzahnung (9) durch Zahnflankenflächen (16, 17) gebildet sind, die sich zwischen den Spitzenkanten (18, 19) eines Zahns (12, 14) und einer Wurzelfläche (32, 33) oder einer Wurzelkante (22, 23) eines Zahns (12, 14) erstrecken.

4. Startervorrichtung (1) nach Anspruch 3,
dadurch gekennzeichnet, dass
die Zahnflankenflächen (16, 17) Kontaktflächen bilden, über welche die Zähne (12) der Außenverzahnung (5) in der Eingriffsstellung (11) mit den Zähnen (14) der Innenverzahnung (9) in Kontakt gebracht werden können oder in Kontakt sind, um das Drehmoment (29) zu übertragen.

5. Verbrennungsmotor (2), der eine Startervorrichtung (1), die nach den Ansprüchen 1 bis 4 realisiert ist, zum Anlassen des Verbrennungsmotors (2) aufweist und einen Zahnkranz (27) aufweist, wobei die Ritzelwelle (6) der Startervorrichtung (1) einem Ritzelrad (26) zugewiesen ist, das in Bezug auf die Ritzelwelle (6) drehfest ist, wobei das Ritzelrad (26) eingerichtet ist, um mit dem Zahnkranz (27) in der Eingriffsstellung (11) in Eingriff zu gelangen, um ein Drehmoment (29) von der Startvorrichtung (1) auf den Verbrennungsmotor (2) zu übertragen.

Revendications

1. Dispositif de démarrage (1) pour lancer un moteur à combustion interne (2),

- présentant un arbre d'entraînement (4) définissant, le long de son extension principale, un axe central longitudinal (3), lequel arbre d'entraînement (4) comporte une denture externe (5),

- présentant un arbre de pignon (6) qui comprend un réceptacle d'arbre d'entraînement en forme de pot (7) dans lequel l'arbre d'entraînement (4) est reçu,

- présentant un dispositif de transmission (8) équipé pour transmettre un couple de rotation (29) de l'arbre d'entraînement (4) à l'arbre de pignon (6), lequel dispositif de transmission (8) comprend une denture interne (9) qui peut s'engrener avec la denture externe (5),

- dans lequel le dispositif de transmission (8) et l'arbre de pignon (6), dans un mouvement d'actionnement (10), sont conjointement réglables axialement par rapport à l'axe central longitudinal (3) entre une position engrenée(11), dans laquelle la denture interne (9) et la denture externe (5) s'engrènent l'une dans l'autre pour transmettre le couple de rotation (29), et une position de base axialement espacée de celle-ci, dans laquelle la denture interne (9) et la denture externe (5) sont désolidarisées,

- dans lequel la denture externe (5) comprend des dents (12) avec des bords de pointe (18) qui, dans la position engrenée (11) et dans le mouvement d'actionnement (10), sont espacées par rapport aux dents (14) de la denture interne (9), et/ou

- dans lequel la denture interne (9) comprend des dents (14) avec des bords de pointe (19) qui, dans la position engrenée (11) et dans le mouvement d'actionnement (10), sont espacées par rapport aux dents (12) de la denture externe (5),

dans lequel un profil de denture (25) des dents (14) de la denture interne (9) est réalisé par un profil trapézoïdal ;

caractérisé en ce qu'un profil de denture (24) des dents (12) de la denture externe (5) est réalisé par un profil d'affûtage en développante.

2. Dispositif de démarrage (1) selon la revendication 1,
caractérisé en ce que

- les dents (12) de la denture externe (5) et les dents (14) de la denture interne (9) comportent des flancs des dents (13, 15),

- les flancs des dents (13) de la denture externe (5) sont configurés en développante et les flancs des dens (15) de la denture interne (9) sont configurés plats.

3. Dispositif de démarrage (1) selon la revendication 2,
caractérisé en ce que
les flancs des dents (13) de la denture externe (5) et/ou les flancs des dents (15) de la denture interne (9) sont formés par des surfaces de flancs des dents (16, 17) qui s'étendent entre les bords de pointe (18, 19) d'une dent (12, 14) et une surface de racine (32, 33) ou un bord de racine (22, 23) d'une dent (12, 14).

4. Dispositif de démarrage selon la revendication 3,
caractérisé en ce que
les surfaces des flanc des dents (16, 17) forment des surfaces de contact au moyen desquelles les dents (12) de la denture externe (5) peuvent être mises en contact ou sont mises en contact dans la position engrenée (11) avec les dents (14) de la denture interne (9) pour transmettre le couple de rotation (29).

5. Moteur à combustion interne (2) présentant un dispositif de démarrage (1) réalisé selon les revendications 1 à 4 pour lancer le moteur à combustion interne (2) et présentant une couronne dentée (27), dans lequel à l'arbre de pignon (6) du dispositif de démarrage (1) est associée une roue de pignon (26) qui ne peut pas tourner par rapport à l'arbre de pignon (6), laquelle roue de pignon (26) est équipée pour s'engrener avec la couronne dentée (27) dans la position engrenée (11) afin de transmettre un couple de rotation (29) du dispositif de démarrage (1) au moteur à combustion interne (2).

Drawing