EP3440339A1 - Démarreur pour moteur thermique de véhicule automobile muni d'une plaque de base a configuration optimisée - Google Patents
Démarreur pour moteur thermique de véhicule automobile muni d'une plaque de base a configuration optimiséeInfo
- Publication number
- EP3440339A1 EP3440339A1 EP17721199.2A EP17721199A EP3440339A1 EP 3440339 A1 EP3440339 A1 EP 3440339A1 EP 17721199 A EP17721199 A EP 17721199A EP 3440339 A1 EP3440339 A1 EP 3440339A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive shaft
- starter
- shaft
- starter according
- base plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
- F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
- F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
- F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
- F02N15/062—Starter drives
- F02N15/063—Starter drives with resilient shock absorbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
- F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
- F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
- F02N15/043—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer
- F02N15/046—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer of the planetary type
Definitions
- the present invention relates to a starter motor for a motor vehicle engine equipped with an optimized configuration base plate.
- a rotating electric machine in the form of a starter provided with a launcher capable of transmitting rotational energy from the starter to a crankshaft. of the engine by means of a starter ring.
- This launcher is mounted movable in translation on a drive shaft between a rest position in which the teeth of a drive pinion are disengaged from the teeth of a starting ring integral with the crankshaft of the heat engine, and a position of activation in which the teeth of the drive pinion mesh with teeth of the starter ring.
- the connection between the launcher and the drive shaft is performed via splines formed in the driver cooperating with splines of complementary shape formed in the drive shaft.
- a speed reducer for example epicyclic type is interposed between the rotor shaft and the drive shaft.
- This speed reducer comprises a planet carrier having a plate secured to the drive shaft. Satellites mounted rotatably on the carrier planet mesh on the one hand with a ring carried by a base plate and on the other hand with a sun gear fixed to the shaft of the electric motor.
- a starter for a combustion engine of a motor vehicle comprising:
- an electric motor comprising a yoke and a rotor mounted on a shaft
- an epicyclic-type speed reducer mounted between the rotor shaft and the drive shaft, the speed reducer comprising a ring gear forming an external planetary gear of the speed reducer, a pinion integral in rotation with the rotor shaft; forming an internal sun gear of the speed reducer and a planet carrier integral in rotation with the drive shaft, at least two satellites mounted free to rotate on the planet carrier and meshing between the inner sun gear and the external sun gear, characterized in the starter further comprises a base plate carrying the ring gear, the base plate being integral with the yoke of the electric motor and comprising:
- the plastic portion comprising a plastic layer between an outer periphery of the pad and an inner periphery of the metal plate.
- the plastic layer between the metal of the wafer and the pad thus makes it possible to support the angle taken by the pad generated by the bending of the drive shaft in order to limit the overpressures of the edge.
- the invention thus makes it possible to improve the wear life of the system.
- a thickness of the plastic layer is at least 0.5mm.
- the plastic portion comprises at least two abutment portions mounted between the crown and the yoke of the electric motor. This keeps the crown radially in the cylinder head.
- the ring comprises projections extending from an outer periphery of the ring.
- damping pads are mounted between the projections and the abutment portions of the plastic portion. Such a configuration makes it possible to damp the shocks undergone by the ring gear.
- the ring gear is part of the plastic portion. This facilitates the realization of the whole.
- the pad has an axial length greater than 5 mm. This minimizes the pressure on the pad when the caster comes into the active position.
- the metal plate comprises a main portion and a shoulder extending axially with respect to the main portion on an end located on the side of the pad.
- the pad has an axial length greater than an axial thickness of the main portion of the wafer.
- the invention is particularly advantageous for this type of configuration where the overhang between the pad and the base plate is important.
- a drive gear mounted on the drive shaft is positioned outside a starter carrier.
- the fatigue resistance of such a system is improved which generates significant internal stresses due to the overhang of the shaft when the launcher is in the active position.
- the starter further comprises a front bearing mounted between the support and the drive shaft to guide the drive shaft in rotation, a launcher comprising helical splines cooperating with helical splines of the drive shaft.
- a launcher comprising helical splines cooperating with helical splines of the drive shaft.
- movable drive between a rest position and an active position and that, in position active, the launcher abuts against a shoulder of the drive shaft located between the base plate and the front bearing.
- Such a shoulder generates shocks and therefore significant internal stresses when the launcher goes into the active position so that the invention is particularly suitable to be implemented with this so-called "thrust abutment" launcher configuration.
- Figure 1 is a longitudinal sectional view of a motor vehicle engine starter according to the present invention.
- Figure 2a is a detailed longitudinal sectional view of a speed reducer according to the present invention.
- Figure 2b is a sectional view of the base plate according to the present invention carrying the gear reducer crown;
- Figure 2c shows a detailed sectional view of the area between the shoulder and the pad of the base plate according to the present invention
- Figure 3 is a perspective view illustrating the mounting of the gearbox crown with the base plate according to the present invention.
- Figure 4 is a schematic cross-sectional view of the freewheel roller of the starter of Figure 1;
- FIG. 5 shows the surface condition of a prestressed shot peened circlip and used with the starter of FIG. 1 for holding the base plate;
- FIG. 6 shows residual stress level curves of an elastic stop ring as a function of a depth in the material respectively for a non-blasted circlip and for a circlip having undergone prestressing shot peening
- FIG. 7 shows so-called Wohler curves representative of the fatigue strength of a circlip by indicating the number of cycles that can be supported by a circlip with or without prestressing shot blasting for a given stress level.
- Identical, similar or similar elements retain the same references from one figure to another.
- use will be made of an axial orientation from back to front corresponding to the right-to-left orientation of FIG.
- a front element is located on the drive pinion side 15, while a rear element is located on the opposite side, that is to say on the side of the rear plate 39.
- the starter 10 comprises a drive shaft 1 1, a launcher 12 mounted on the drive shaft 1 1 and having a drive gear 15.
- a motor Electrical 16 includes an inductor stator 17 and an armature rotor 18 mounted coaxially.
- the stator 17 surrounds the rotor 18, which is mounted on a shaft 19 of the electric motor 16.
- the rotor 18 is able to rotate about an axis X inside a cylinder head 21.
- the latter is secured to a metallic support 23 of the starter 10 intended to be fixed on a fixed part of the motor vehicle.
- the stator 17 comprises a plurality of magnetic inductor poles 26 carried by the inner periphery of the yoke 21.
- the stator 17 comprises an inductor winding comprising two pairs of windings which are each wound around a pole mass integral with the yoke 21.
- Each winding is composed of a continuous conductor wound around the polar mass in the direction of its thickness so as to form concentric contiguous turns of increasing diameter.
- the rotor 18 comprises a pack of sheets provided with grooves for mounting electrical conductors in the form of pins. These conductors are interconnected to form a rotor winding 27 in connection with conductive blades 30 belonging to a collector 31 with electrically insulating body integral with the shaft 19 of the electric motor 16. Alternatively, the coil 27 is continuous wire. Brushes 34 rub on the commutator blades 30 of the manifold 31 to supply the rotor winding 27. The brushes 34 belong to a brush holder 35 equipped with guide cages and to receive the brushes 34. These brushes 34 are biased towards the blades collectors 30 by springs 36 for example of spiral type.
- the brush holder 35 is integral with a metal rear flange 39 having in its central portion a housing for mounting a bearing 40 of the needle bearing type.
- the flange 39 serves for rotatably mounting the rear end of the shaft 19 of the electric motor 16.
- the front end of the shaft 19 penetrates, via a section of reduced section, inside a bore made in the rear part of the drive shaft 1 1, a bearing 43 being interposed between these two elements 19, 1 1.
- the axis of the shaft 19 coincides with the axis X of the rotor 18 and with the axis of the drive shaft 11.
- the rear flange 39 serves as a centralizer at the rear end of the yoke 21 and is connected by tie rods to the support 23 of the starter 10.
- the metal yoke 21 is interposed clamping between the metal support 23 and the metal rear flange 39.
- the starter 10 also comprises an electromagnetic contactor 46 extending parallel to the electric motor 16 by being implanted radially above it.
- the contactor 46 has a metal tank 47 carried by the support 23, and equipped with an excitation coil 48 provided with at least one winding.
- the tank 47 is closed at the rear by a cover 49 of electrically insulating material. Fixing the cover 49 is made by folding the material of the free end of the tank 47.
- Terminals 50, 51 are shaped to each form a fixed contact inside the cover 49.
- One of the terminals 50 is intended to be connected to the positive terminal of the battery, the other terminal 51 is connected via a cable brushes 34 positive polarity.
- a mobile core 54 is attracted by magnetic attraction towards the fixed core 55 to, firstly, act after catching a game on a rod 56 carrying a contact mobile 57 to cause the closing of the contacts 50, 51 of the contactor 46 and feed the electric motor 16 of the starter 10, and, secondly, actuate a control lever 58 of the launcher 12.
- the drive shaft 1 1 is rotatably mounted in a front bearing 61 of the support 23 via a pinion carrier 62.
- This front bearing 61 to guide the drive shaft 1 1 in rotation consists of for example by a ball bearing.
- the pinion carrier 62 comprises a hollow shaft 63 to allow the passage of the drive shaft January 1.
- Two bearings 64 are interposed between the outer periphery of the drive shaft January 1 and the inner periphery of the pinion carrier shaft 63 to allow a relative rotational movement between the two elements 1 1, 63.
- the outer periphery of the pinion shaft 63 is in contact with the inner periphery of the front bearing 61.
- the drive pinion 15 is mounted to rotate with the pinion shaft 63 via axial splines formed in the inner periphery of the pinion engaged with axial splines of complementary shape formed in the outer periphery of the pinion.
- a shock absorption device 67 comprises a spring 68 urging the pinion 15 against a stop 69 in the idle state. In the event of an impact with the teeth of the starter ring, the spring 68 is compressed by the translational movement of the pinion 15 which then has a tendency to move back relative to the stop 69. It will be appreciated that the pinion 15 is mounted on the pinion. drive shaft 1 1 outside the support 23 of the starter 10. Such a starter configuration 10 called “outgoing gear" generates significant internal stresses due to the cantilever of the drive shaft 1 1 when the launcher 12 is in the active position.
- the launcher 12 is slidably mounted on the drive shaft January 1 and comprises a driver 72 configured to be actuated by the control lever 58 pivoting, and a freewheel roller 73 interposed axially between the driver 72 and the carrier pinion 62.
- This freewheel 73 comprises a driven ring 76 located on the rear end side of the pinion carrier shaft 63.
- the driven ring 76 has on its outer periphery an internal track 77 clearly visible in FIG. embodiment, the driven ring 76 is a monobloc of same material with the pinion shaft 63.
- the driver 72 comprises a driving ring 78 of the freewheel 73 provided with ramps 79 on its inner periphery.
- the driving ring 78 is thus integral in rotation with the shaft 1 1 via the driver 72 when the launcher 12 is in the active position.
- a plurality of Y axis rollers 82 are mounted between the inner track 77 and a corresponding ramp 79.
- the freewheel 73 has a plurality of pre-load springs 83 each mounted between a rim of a ramp 79 and a corresponding roller 82.
- the locking direction of the freewheel 73 is illustrated by the arrow A (see FIG.
- N is at the power 5/2
- the expression (R + r) / (R * r) is at the power 5/2
- the set is at the power 1/2
- N being the number of rollers 82
- R is the radius of the inner track 77
- L is the axial length of each roller 82 measured along the Y axis
- ⁇ is between 200 and 700.
- the driver 72 further comprises a washer 86 defining with a transverse wall of the driver 72 a groove for receiving the fingers of the lower end of the lever 58 fork-shaped.
- the upper end of the lever 58 is mounted in a known manner to articulation on a rod 87 elastically connected to the movable core 54 via a spring 88, said tooth against tooth spring, housed in the movable core 54.
- the driver 72 is internally provided with helical splines 90 in complementary engagement with external helical gears 91 carried by the drive shaft January 1 in the vicinity of its rear end of larger diameter (see Figure 1).
- the launcher 12 incorporating the freewheel 73 is thus driven in a translation movement when it is moved by the lever 58 between a rest position in which the pinion 15 is disengaged from the starting ring of the heat engine and an active position in the which pinion 15 is engaged with the starting ring of the engine.
- the driver 72 In the active position, the driver 72 abuts against a shoulder 93 made between the teeth 91 of the drive shaft January 1.
- This shoulder 93 of the drive shaft 1 1 is located axially between the base plate 106 and the front bearing 61.
- a speed reducer 96 in the form of an epicyclic gear train is mounted between the rotor shaft 18 and the drive shaft 11. More specifically, the rear end of the drive shaft January 1 is configured to be secured to a plate of a planet carrier 97 for example by crimping. Satellites 101 meshing on the one hand with a ring gear 102 forming an outer sun gear and on the other hand with a pinion gear 103 secured to the front end of the rotor shaft 19 forming an internal sun gear of gear reducer 96. Satellites 101 are mounted free in rotation each around an axis carried by the planet carrier 97. The satellites 101 are at least two in number. In this case, three satellites 101 are used.
- the ring 102 is carried by a base plate 106 shown in detail in FIG. 2b integral with the cylinder head 21 of the engine by clamping between said cylinder head 21 and the support 23 of the starter 10.
- the base plate 106 comprises a metal plate 107, a pad 108 mounted on the shaft 1 1 to drive in rotation the drive shaft 1 1, and a plastic portion 109 overmolded on the plate 107 and the pad 108 to make them integral with each other.
- the plastic portion 109 comprises a plastic layer 1 12 between an outer periphery of the pad 108 and an inner periphery of the wafer 107 corresponding to an edge of the wafer 107 defining a central opening 1 16 for the passage of the shaft 1 January.
- a layer 1 12 clearly visible in Figure 2c can support the angle taken by the pad 108 generated by the bending of the shaft 1 1 to limit edge overpressure.
- the thickness E of this plastic layer 1 12 is at least 0.5 mm. In order to minimize the pressure exerted by the drive shaft 1 1, it is possible to use a bearing 108 having an axial length greater than 5 mm.
- the metal plate 107 comprises a main portion 1 14 and a shoulder 1 15 extending axially relative to the main portion 1 14 on one end of the plate 107 on the side of the Bearing 108.
- the shoulder 1 15 is thus located at the inner periphery of the wafer 107 around the central opening 1 16 of the wafer 107, while the main portion 1 14 extends from the shoulder 1 to 15 the outer periphery of the wafer 107.
- the wafer 107 thus has an excess thickness at the end located on the side of the pad 108.
- the pad 108 has an axial length L1 greater than the axial thickness L2 of the main portion 1 14 of the wafer 107.
- the plastic portion 109 comprises at least two abutment portions 120 mounted between the ring 102 and the yoke 21. These abutment portions 120 extending circumferentially around the ring 102 make it possible to hold the ring 102 radially in the cylinder head 21.
- the ring 102 attached to the base plate 106 includes projections 121 extending from an outer periphery of said ring gear 102. Damping pads 122 are mounted between the projections 121 of the ring gear 102 and the stop portions 120 of the ring gear 102. plastic portion 109. Such a configuration makes it possible to damp the shocks suffered by the ring 102 made for example of metal.
- the ring 102 is part of the plastic portion 109.
- the teeth of the ring 102 are molded with an axial annular wall of the plastic portion 109.
- a holding element 125 taking for example the form of a circlip type elastic locking ring is positioned in a groove 126 of the drive shaft. 1 1 to abut against the base plate 106 (see Figure 2a).
- the elastic stop ring 125 has the shape of an open ring that can be deformed elastically with the aid of a tool to allow it to be positioned inside the groove 126.
- the circlips 125 bears against a metal support washer 141 which bears against the plastic portion 109 of the base plate 108. As shown in FIG.
- the elastic stop ring 125 includes traces of pre-stress shot peening impact 133 on at least its radial face opposite the base plate 106. To prevent the elastic locking ring 125 from being deformed in the prestressed state, the traces of shot peening impact of prestressing are located on the side of the two radial faces of the elastic stop ring 125.
- the residual compressive stresses associated with the shot blast impact traces of prestresses located at a depth in the material of between 0 and 20 ⁇ m are between -600 and -1000 MPa.
- the residual stresses of an elastic stop ring which has not undergone prestressing shot peening are positive.
- the prestressing shot peening applied on the elastic stop ring 125 is to be distinguished from the shot peening or deburring carried out at the end of the manufacturing process and which does not make it possible to obtain compressive stresses between - 600 and -1000 Mpa.
- the impact intensity of the media is thus much greater in the case of prestressing shot blasting than in the case of cleaning shot blasting.
- the elastic stop ring 125 is made of steel and has undergone bainitic quenching treatment.
- the thickness of the elastic stop ring 125 is for example of the order of 2 mm plus or minus 10%.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1653099A FR3049984B1 (fr) | 2016-04-08 | 2016-04-08 | Demarreur pour moteur thermique de vehicule automobile muni d'une plaque de base a configuration optimisee |
| PCT/FR2017/050842 WO2017174951A1 (fr) | 2016-04-08 | 2017-04-07 | Démarreur pour moteur thermique de véhicule automobile muni d'une plaque de base a configuration optimisée |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3440339A1 true EP3440339A1 (fr) | 2019-02-13 |
| EP3440339B1 EP3440339B1 (fr) | 2024-03-06 |
Family
ID=56684012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17721199.2A Active EP3440339B1 (fr) | 2016-04-08 | 2017-04-07 | Démarreur pour moteur thermique de véhicule automobile muni d'une plaque de base à configuration optimisée |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3440339B1 (fr) |
| CN (1) | CN108884803B (fr) |
| FR (1) | FR3049984B1 (fr) |
| WO (1) | WO2017174951A1 (fr) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2555670B1 (fr) * | 1983-11-30 | 1986-10-31 | Paris & Du Rhone | Demarreur electrique comportant une plaque de base supportant la carcasse de son moteur electrique et la culasse de son contacteur |
| FR2725758B1 (fr) * | 1994-10-18 | 1997-01-10 | Valeo Equip Electr Moteur | Demarreur electrique pour un moteur a combustion de vehicule automobile |
| US5905309A (en) * | 1996-02-15 | 1999-05-18 | Denso Corporation | Starter with shock absorbing device |
| US6993989B2 (en) * | 2002-04-26 | 2006-02-07 | Denso Corporation | Starting apparatus |
| JP4111017B2 (ja) * | 2003-03-13 | 2008-07-02 | 株式会社デンソー | スタータ |
| DE102008042431A1 (de) * | 2008-09-29 | 2010-04-01 | Robert Bosch Gmbh | Reduziergetriebe sowie Startervorrichtung einer Brennkraftmaschine |
| DE102010003431B4 (de) * | 2010-03-30 | 2019-05-16 | Seg Automotive Germany Gmbh | Startvorrichtung mit Hohlrad- und Zwischenlagerdämpfung |
| FR2969219B1 (fr) * | 2010-12-20 | 2013-01-11 | Valeo Equip Electr Moteur | Ensemble pour reducteur de vitesse d'une machine electrique tournante et demarreur pour moteur thermique associe |
| FR3013396A1 (fr) * | 2013-11-21 | 2015-05-22 | Valeo Equip Electr Moteur | Lanceur de demarreur de moteur thermique a couronne dentee de demarrage et demarreur comportant un tel lanceur |
| DE102014209315B4 (de) * | 2014-05-16 | 2016-09-01 | Robert Bosch Gmbh | Startvorrichtung für eine Brennkraftmaschine |
-
2016
- 2016-04-08 FR FR1653099A patent/FR3049984B1/fr active Active
-
2017
- 2017-04-07 WO PCT/FR2017/050842 patent/WO2017174951A1/fr not_active Ceased
- 2017-04-07 EP EP17721199.2A patent/EP3440339B1/fr active Active
- 2017-04-07 CN CN201780022250.7A patent/CN108884803B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3049984A1 (fr) | 2017-10-13 |
| CN108884803B (zh) | 2020-12-01 |
| EP3440339B1 (fr) | 2024-03-06 |
| CN108884803A (zh) | 2018-11-23 |
| FR3049984B1 (fr) | 2018-03-23 |
| WO2017174951A1 (fr) | 2017-10-12 |
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