Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/08—Structural association with bearings
  • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/14—Means for supporting or protecting brushes or brush holders
  • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
  • H02K5/148—Slidably supported brushes
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
  • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
  • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
• • 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

Definitions

• the invention relates to an electric machine, in particular a starter for an internal combustion engine of a motor vehicle, which interacts with a Einspurvorraum, comprising a stator and a rotor, which comprises a rotor shaft and an armature with a commutator, and with a bearing on the commutator side.
• Rotor has a rotor shaft with an armature and a commutator, wherein the armature is energized via the commutator to generate a magnetic field between the rotor and stator for a rotational movement of the rotor.
• the stator may be formed with magnets in a pole housing. The rotary motion is transmitted to the engine on the output side of the rotor in order to start it.
• DE 29 04 495 A1 describes a starting device of a motor vehicle with a starter motor with a stator and a rotor comprising a rotor shaft with an armature and a commutator, wherein the rotor shaft with a commutator end and stored with its other end with an axial play is.
• DE 100 16 706 A1 describes a starting device of a motor vehicle with a starter motor with stator and rotor for cranking internal combustion engines.
• DE 40 06 797 A1 describes a starting device with a pinion for driving a sprocket of an internal combustion engine.
• the end of a rotor shaft of a rotor is mounted on a needle bearing and is captured by a housing cap.
• the opposite end of the rotor shaft includes a sun in the planetary gear.
• the rotor shaft is floating.
• US 22 71 640 A describes an electric machine for starting an aircraft engine.
• a deep groove ball bearing is provided as a fixed bearing.
• EP 0 819 847 A1 describes a starter with an improved lever drive.
• the rotor of the starter motor is attached to the side of the planetary gear with a deep groove ball bearing as a floating bearing.
• the rotor shaft of the machine according to the invention is rotatably mounted without play at a fixed position with a fixed bearing in the context of rolling bearing air tolerances, so that reduces axial play of the rotor shaft and / or the rotor shaft is even stored without play.
• the reduced play reduces the space requirement of the rotor shaft in the axial direction, so that the inventive see machine with smaller dimensions, so also resource-saving, can be produced.
• a floating bearing of the rotor is inexpensive and safely achieves previous requirements. To increase the number of starting device in the
• roller bearing air tolerances preferably include a tolerance of 1/100 to 1/1000 mm. Furthermore, reduced by the reduced clearance of the wear in the commutation and thus increases the life of the electric machine.
• the electric machine is a DC machine and the armature is energized via the commutator by means of brushes, wherein the brushes are arranged in the axial direction at a fixed position.
• the axial length of the commutator is increased in relation to the dimensions of the brushes in accordance with the axial play of the rotor shaft in order to ensure a tolerance compensation of the contact surfaces between commutator and brushes in the axial play.
• the invention makes it possible to adapt the axial length of the commutator improved to the size of the brush, so in particular to reduce the size of the commutator and thus produce more resource-conserving, with copper can be saved as a material of the commutator.
• the reduced clearance reduces brush wear and thus increases the life of the machine.
• contamination of the commutator, in particular by bearing grease or oil from the commutator side bearing of the rotor, is reduced, so that the electrical resistance during commutation is not unnecessarily increased or the electrical power is reduced.
• the bearing on the commutator side is a fixed bearing.
• the commutation thus calms down, because shocks are transmitted to the rotor shaft not or at least reduced to the commutation system, such as shocks by compression and decompression of the internal combustion engine, via the drive shaft on the Rotor shaft of the starter are routed. This reduces in particular the brush wear and the life of the machine increases.
• the bearing is arranged on the commutator side at the opposite end of the output side of the rotor shaft. So it is protected from contamination by the mechanical coupling device of the rotor shaft to the output side.
• the electric machine may have a further bearing, in particular a loose bearing, the rotor shaft, which preferably with respect to the bearing on the
• Commutator side of the rotor in the axial direction along the rotor shaft on the winding side, ie to the output side, is arranged.
• the movable bearing in the cover or in a ring gear of the planetary gear which except for the storage of the
• Rotor shaft and a translation of the rotational movement of the rotor is used and thus by the combination of bearing and gearbox in a component is particularly resource efficient. It is preferred that the rotor shaft on the commutator, and in particular on one of the output side facing away from the end face, is fixed axially with an axially disposed screw.
• the fixed bearing according to the invention comprises a rolling bearing, in particular a ball bearing, so that the friction of the bearing is reduced and the
• the fixed bearing is clamped to a housing cover of the machine.
• the outer ring of the rolling bearing is clamped by the housing cover.
• the inner ring of the roller bearing is clamped in the axial direction against the rotor shaft with a holding disk and / or a screw.
• a holding disk and / or a screw This allows the rotor shaft to be driven by means of fewer components. Ie produce resource-saving.
• the rotor shaft can be clamped with a U-washer, a retaining ring and / or a snap ring.
• the fixed bearing is arranged on the housing cover and fixed the rotor shaft through the housing cover with a screw against a retaining plate. Through the connection of the fixed bearing with the housing cover, the rotor shaft can be stored in a particularly resource-saving, since, for example, an additional holding device for the fixed bearing can be omitted.
• Fig. 1 is a sectional view of a starter according to the invention
• FIG. 2 a) - c) perspective partial views of a starter according to the invention.
• Fig. 1 shows an embodiment of an electric machine according to the invention, namely a starter 1 for an internal combustion engine having a rotor 21 and a stator 29 in a housing 30.
• the rotor 21 includes an armature 3, a commutator 4 with brushes 32 and a rotor shaft 2.
• the rotor 21 is mounted on the output side, in Fig. 1 left, in a needle bearing 34 as a floating bearing and connected to a planetary gear 31.
• a bearing 25 on the commutator is as a fixed bearing, namely in the form of a
• Ball bearing formed and at the opposite end of the output side arranged from the rotor shaft 2. Due to the bearing 25 on the commutator as a fixed bearing rotor shaft 2 is mounted without play in the axial direction of the commutator 4. It follows that the commutator 4 in the axial direction only slightly wider than the brush 32 must be formed. By shortened compared to conventional commutators construction resources are conserved, in particular, the material copper is reduced. The use of materials is therefore more effective than in a conventional construction. Also, a calming of the commutator is achieved and thus reduces wear and increase the life. In addition, the commutator 4 is less dirty, for example by bearing grease and oil, so that over the life of a reduced resistance in the commutation, ie a higher performance of the starter 1 is achieved.
• the bearing 25 on the commutator side ie the ball bearing, is with its outer ring of a housing cover 26 in conjunction with a closure cap
• the starter 1 is so easy to assemble and disassemble non-destructively, for example, for maintenance, so that the life is extended.
• FIGS. 2 a to 2 c show perspective partial views of a further embodiment of the starter 1 with the rotor 21.
• FIG. 2 a shows the end of the rotor 21 opposite the output side already shown in FIG. 1, along the axial direction of FIG Rotor shaft 2 to the output side, so in Fig. 2a from top to bottom, the commutator 4 is followed by the armature 3 on the rotor shaft 2 is arranged.
• the rotor shaft 2 at this end a formed as a recessed stage La gerstelle 9 for the bearing 25 on the commutator, wherein the step is designed as a stop 10 for the bearing.
• Fig. 2b shows a perspective partial view of a housing cover 6 of the starter 1 from an inner side, ie with the housing open.
• the bearing 25 on the commutator side is formed as a rolling bearing 5.
• the commutator side bearing so the rolling bearing 5, fixedly mounted on the housing cover 6 of the starter 1 with two mounting screws 11 and a roller bearing holder 12 by the outer ring of the rolling bearing 5 is clamped to the housing cover 6.
• the rolling bearing 5 is pressed into the housing cover 6 or attached to this in a different way.
• FIG. 2c shows a perspective partial view of the starter 1 in the mounted state, that is to say the housing cover 6 already shown in FIG. 2b
• the rotor shaft 2 is fixed by the housing cover 6 with a screw 8 against a retaining plate 7.
• the screw 8 is screwed in an end-side threaded bore of the rotor shaft 2 at the output side of the opposite end, and from an outer side of the housing cover 6 from.
• the rolling bearing 5 is pushed onto the bearing 9.
• the commutator 4 according to the invention is shortened in the axial direction compared to a conventional commutator, thus also conserving resources, designed to be adapted to the dimensions of the brushes, not shown, and it reduces the wear of the starter 1 and increases the life.
• All figures show only schematic not to scale representations. Moreover, reference is made in particular to the drawings for the invention as essential.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Motor Or Generator Frames (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Dc Machiner (AREA)
• Sliding-Contact Bearings (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (2)

Family

ID=43382490

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (3)

Citations (5)

Family Cites Families (5)

• 2009
  • 2009-07-21 DE DE102009027859.1A patent/DE102009027859B4/de not_active Expired - Fee Related
• 2010
  • 2010-07-16 WO PCT/EP2010/060348 patent/WO2011009823A2/de active Application Filing
  • 2010-07-16 CN CN201080041731.0A patent/CN102549889B/zh not_active Expired - Fee Related
  • 2010-07-16 EP EP10734118A patent/EP2457310A2/de not_active Withdrawn

Patent Citations (5)

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