EP2072808A2 - Démarreur pour un moteur à combustion interne doté d'un déflecteur de salissures entre le démarreur et les éléments de liaison - Google Patents

Démarreur pour un moteur à combustion interne doté d'un déflecteur de salissures entre le démarreur et les éléments de liaison Download PDF

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Publication number
EP2072808A2
EP2072808A2 EP08105983A EP08105983A EP2072808A2 EP 2072808 A2 EP2072808 A2 EP 2072808A2 EP 08105983 A EP08105983 A EP 08105983A EP 08105983 A EP08105983 A EP 08105983A EP 2072808 A2 EP2072808 A2 EP 2072808A2
Authority
EP
European Patent Office
Prior art keywords
starter
dirt deflector
rotor shaft
starter according
partition wall
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.)
Withdrawn
Application number
EP08105983A
Other languages
German (de)
English (en)
Inventor
Mathias Fein
Walter Gerschwitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2072808A2 publication Critical patent/EP2072808A2/fr
Withdrawn legal-status Critical Current

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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
    • F02N15/043—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
    • 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
    • F02N11/00—Starting of engines by means of electric motors
    • 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
    • F02N2250/00—Problems related to engine starting or engine's starting apparatus
    • F02N2250/08—Lubrication of starters; Sealing means for starters

Definitions

  • the invention relates to a starter for an internal combustion engine, in particular an internal combustion engine of a motor vehicle, according to the preamble of claim 1.
  • a starter of the type mentioned also called cranking device is, for example, in DE 199 55 065 A1 disclosed.
  • the known starter comprises a starter motor with a stator and a rotor, the rotor shaft is operatively connected via a trained as a planetary gear countershaft with an axially displaceable driver.
  • the driver is part of a Einspurgetriebes with freewheel and Andrehritzel, which can be brought by axial displacement of the driver with a ring gear of a drive gear of the internal combustion engine into engagement.
  • a partition wall is arranged with a passage opening whose boundary edge is bent in the direction of the starter motor.
  • the opening which is provided with an external toothing, designed as a sun gear of the planetary gear front end of the rotor shaft extends into the planetary gear.
  • contaminants can also enter the planetary gear through the opening, which pass through the air gap between the rotor and the stator into a region of the housing adjoining the partition on the motor side, such as coal dust from the carbon brushes, abrasion from the commutator or others Air vents from outside into the housing of the starter motor penetrated dirt particles.
  • the invention has the object to extend the life of the starter with little effort.
  • This object is achieved by a mounted in an annular gap between an inner periphery of the partition wall and an outer periphery of the rotor shaft, surrounding the rotor shaft dirt deflector that protects the planetary gear from carbon dust entry of the carbon brushes, abrasion from the commutator or other harmful media.
  • dirt deflector can be installed at this point, without more than minor changes in the design of the starter and its manufacture and assembly required.
  • a preferred embodiment of the invention provides that the dirt deflector is attached to the partition, so that it can not rotate with the rotor shaft.
  • the dirt deflector can be firmly connected to the partition, for example by gluing, welding, scorching, molding, melting or by pressing in the passage opening for the rotor shaft. This allows the dirt deflector prefabricated as a unit with the partition and insert it together with the partition in the housing of the starter, which not only kept the number of components required as small as possible, but also a significant increase in the number of manufacturing and assembly steps can be avoided because only a single additional manufacturing step in the production of the partition is required.
  • the dirt deflector can also be releasably connected to the dividing wall, preferably by latching with the inner circumference of the dividing wall, that is, with an edge of the rotor shaft passage opening.
  • the dirt deflector can be retrofitted, i. after mounting the partition in the housing of the starter, be attached to the partition, whereby damage to the dirt deflector when pressing the partition or measures to prevent damage to the dirt deflector in this manufacturing step are unnecessary.
  • the gear-side front end of the rotor shaft is provided with external teeth and forms the sun gear of the planetary gear, which must be inserted through the passage opening in the partition during assembly of the rotor in the housing of the starter and after assembly for the purpose of reducing the cross-sectional dimensions of the annular gap between the inner periphery of the partition wall and the outer circumference of the rotor shaft through the opening extends, provides an advantageous embodiment of the invention, the dirt deflector at least partially between the inner periphery of the partition wall and the outer toothing of the sun gear to order a modification to avoid the rotor shaft.
  • the dirt deflector in this case can not completely close the gap between the partition and the sun gear due to the teeth, it is formed according to a preferred embodiment of the invention as a sleeve coaxial with the rotor shaft, not only through the annular gap between the inner circumference the partition wall and the outer toothing of the sun gear extends therethrough in order to reduce it as much as possible, but also beyond the motor side in the axial direction of the rotor shaft on the outer toothing of the sun gear out into the interior of a winding of the rotor surrounded space and preferably extends into the vicinity of an adjacent to the planetary gear end face of a disk set of the rotor.
  • a kind of labyrinth is created in the space surrounded by the winding head of the rotor, which significantly impedes the penetration of harmful media in the direction of the planetary gear.
  • the sleeve can advantageously be provided with at least one circumferential projection projecting radially inwards and / or radially outwards, which further impedes the penetration of harmful media in the direction of the planetary gear.
  • a particularly good dirt-repellent effect can also be achieved in that the dirt deflector completely closes the annular gap between a cylindrical outer circumference of the rotor shaft and the inner periphery of the partition wall or the edge of the passage opening and, for example, with an annular sealing lip against the outer peripheral surface of the rotor shaft is applied.
  • the teeth of the sun gear on the transmission-side end face of the rotor shaft in the direction of the starter motor does not extend into the region of the sealing lip, but this requires a modification to the rotor shaft.
  • starter 2 for an internal combustion engine of a passenger car has a housing 4, which accommodates a starter motor 6, designed as a planetary gear 8 countershaft and a Einspurgetriebe 10 and a projecting beyond the housing 4 andrush 12, which is at startup of the engine with Help a mounted on the housing 4 magnetic switch 14 with a ring gear of a drive gear (not shown) of the internal combustion engine can be engaged.
  • the starter motor 6 essentially consists of a stator 16 and a rotatably mounted rotor 18, wherein the stator 16 comprises a stator winding 22 mounted in a cylindrical part 20 of the housing 4, while the rotor 18 comprises a rotor shaft 24 and a disk set mounted on the rotor shaft 24 26 and 26 housed in grooves 28 of the laminated core and separated by an air gap 30 of the stator winding 22 rotor windings 32 includes.
  • a commutator 34 On a projecting beyond the stator 16 end portion of the rotor shaft 24, a commutator 34 is mounted, the power is supplied via carbon brushes 36, while the opposite end portion of the rotor shaft 24 extends into the planetary gear 8 and a trained as a sun gear 38, with an external toothing Has 40 provided front end.
  • the planetary gear 8 itself and the Einspurgetriebe 10 with a freewheel 42 and an actuatable via an engaging lever 44 by the magnetic switch 14 drivers 46 are formed in a known manner and are therefore not described here.
  • cylindrical housing part 20 is closed on the side of the commutator 34 by a bearing cap 48 with a pivot bearing 50 for the projecting beyond the commutator 34 front end of the rotor shaft 24.
  • the cylindrical housing part 20 is provided with a partition wall 52 which separates the starter motor 6 from the planetary gear 8.
  • the produced by forming from sheet metal and pressed with its outer peripheral edge in the housing part 20 partition 52 has a central passage opening 54 for the formed as a sun gear 38 end portion of the rotor shaft 24.
  • the partition wall 52 is provided at its inner periphery, that is around the opening 54 around, with a dirt deflector 58, in the region of the bent boundary edge 57 of the opening 54th is attached.
  • an opening cross-section of an annular gap between a tip circle 64 and an outer circumference of the external toothing 40 of the sun gear 38 on the one hand and the opposing inner circumference of the dividing wall 52 formed by the edge 57 on the other hand can be considerably reduced.
  • the dimensions of the sleeve 60 on the existing cross-sectional dimensions of the annular gap and the existing axial distance between the Partition 52 and the end face 62 of the laminated core 26 tuned and the sleeve 60 then made for example by injection molding of plastic with suitable dimensions, before being locked in the illustrated embodiments with the partition wall 52.
  • the sleeve 60 is inserted from the opposite side into the passage opening 54, that is, from the side of the starter motor 6 ago to lock it with the partition wall 52.
  • the sleeve 60 has there an elastically deformable transmission-side end portion 72 with a comparison with the rest of the sleeve 60 is slightly smaller outside diameter over which a locking lug 74 provided with a detent 76 projects outwardly.
  • the detent 76 After insertion of the end portion 72 in the opening 54, the detent 76 is located with a rounded abutment shoulder on the edge 57 of the opening 54 on the transmission side closely against the partition wall 52 when a step 78 between the end portion 72 and the rest of the sleeve 60 abuts against the motor-side end face of the bent edge 57.
  • the locking lug 76 can either rotate around the entire circumference of the sleeve 60 or have interruptions in the circumferential direction.
  • the sleeve 60 in addition to a limited by the step 78, outwardly projecting circumferential projection 80 and a closer to its motor-side end 63 inwardly projecting circumferential projection 82.
  • the protrusions 80, 82 enhance the soil-repelling property of the sleeve 60 by retaining a portion of the contaminants reaching the protrusions 80, 82, respectively.
  • the sleeve 60 of other materials, such as steel, an elastomeric material or a multi-component material and firmly connect them to the partition wall 52 before it is inserted into the housing 4 of the starter 2 , depending on the material of the sleeve 60, for example, by welding, molding, scorching, gluing or melting on the partition wall 52 or by pressing in the passage opening 54 of the partition wall 52nd

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)
EP08105983A 2007-12-19 2008-12-16 Démarreur pour un moteur à combustion interne doté d'un déflecteur de salissures entre le démarreur et les éléments de liaison Withdrawn EP2072808A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007061115.5A DE102007061115B4 (de) 2007-12-19 2007-12-19 Starter für eine Brennkraftmaschine mit Schmutzabweiser zwischen Startermotor und Getriebe

Publications (1)

Publication Number Publication Date
EP2072808A2 true EP2072808A2 (fr) 2009-06-24

Family

ID=40456532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105983A Withdrawn EP2072808A2 (fr) 2007-12-19 2008-12-16 Démarreur pour un moteur à combustion interne doté d'un déflecteur de salissures entre le démarreur et les éléments de liaison

Country Status (2)

Country Link
EP (1) EP2072808A2 (fr)
DE (1) DE102007061115B4 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955065A1 (de) 1999-11-15 2001-05-23 Bosch Gmbh Robert Starter für eine Brennkraftmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2116052A1 (de) * 1971-04-02 1972-10-26 Robert Bosch Gmbh, 7000 Stuttgart Andrehvorrichtung fur Brennkraft maschinen
JPH0231582Y2 (fr) * 1984-09-25 1990-08-27
JP3338244B2 (ja) * 1995-08-18 2002-10-28 三菱電機株式会社 遊星歯車減速機構
DE29623080U1 (de) * 1996-06-22 1997-10-02 Robert Bosch Gmbh, 70469 Stuttgart Planetengetriebe
JP4479670B2 (ja) * 2006-02-01 2010-06-09 株式会社デンソー スタータ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955065A1 (de) 1999-11-15 2001-05-23 Bosch Gmbh Robert Starter für eine Brennkraftmaschine

Also Published As

Publication number Publication date
DE102007061115B4 (de) 2016-07-21
DE102007061115A1 (de) 2009-06-25

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