Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R39/00—Rotary current collectors, distributors or interrupters
  • H01R39/02—Details for dynamo electric machines
  • H01R39/38—Brush holders

Definitions

• the invention relates to a drive unit, in particular of a gear motor for windshield wipers, windows or the like of a motor vehicle according to the preamble of the independent claim.
• WO 03/100 920 A1 discloses a brush arrangement for an electric motor which has leaf-spring-like brush springs for pressing the brushes against the commutator, wherein the brush part has legs extending away from the brush on both sides, by which the brush spring is connected to the brush holder and elastically pressed against the commutator.
• the legs of the brush springs have angled, offset to the motor axis arranged portions which are bolted to the brush holder.
• the drive unit according to the invention with the features of the independent claim has the advantage that
• the brush holder used and the associated brush springs are simple and inexpensive to produce and can be easily and without tools attached to the drive unit, in an advantageous manner after assembly of the rotor and the commutator of the machine. This eliminates in particular the steps and the tools for locking the brush during insertion of the commutator.
• the measures listed in the dependent claims advantageous refinements and improvements of the independent claim device are possible. It is particularly advantageous that when inserting the spring in the brush holder a detent on the brush holder a spring end of the brush spring positively engages around, whereby the insertion facilitates and at the same time an accurate and secure positioning of the spring is ensured.
• the brush spring is substantially C-shaped and arranged the associated brush centrally on the spring, resulting in the installed state, a uniform force distribution on the spring legs and thereby uniform wear of the brush.
• this arrangement and design of the brush spring ensures that the brush in operation safely and permanently applied under bias to the commutator, without additional fasteners and that when the brush wear no change in their point of support.
• the U-shaped brush holder has openings in its middle leg for threading the brush springs during assembly after the Rotor of the machine and with it the commutator are already positioned and mounted.
• the commutator facilitates the assembly of the commutator and on the other hand delivers the already mounted commutator for subsequent insertion of the brush springs with the brushes the contact pressure for positioning the brush springs.
• the positive locking for the brush springs are expediently arranged so that they face the openings for introducing the brushes and thus detect the front end of the brush springs during insertion already in the correct end position.
• Figure 1 is a schematic and reduced
• Figure 2 is a plan view of the brush holder of
• Commutator motor according to the arrow II in Figure 1 and 3 shows a section through the brush holder of
• FIG. 1 denoted by 10 is a schematically illustrated DC motor of a drive unit, which is arranged in a motor housing 12, to which a gear housing 14 is flanged.
• the gear housing is closed by a gear cover 16, which allows access in the removed state for mounting purposes.
• the DC motor 10 is formed as a commutator with a stator 18 and a rotor 20, the shaft 22 is extended as a drive shaft in the gear housing 14 and equipped with gear parts, not shown.
• the rotor winding is denoted by 24 and connected in an electrically conductive manner to the lamellae 26 of a commutator 28 likewise fastened to the shaft 22.
• grind brushes 30 and 31 which are pressed by symbolized brush springs 32 and 33 in the radial direction of the commutator 28.
• Brush springs 32 and 33 are connected to a positive pole 34 and a negative pole 36 of a DC voltage source.
• a DC motor 10 is shown with two brushes, as used for example in rear wipers of motor vehicles. If required for a second speed level of the motor, however, a third brush can be arranged in a known manner on the commutator. The possibility of a third brush for Provide a second speed level, also applies to all subsequent embodiments, for simplicity, the further description is based on a motor design with two brushes in a U-shaped brush holder 38th
• FIG. 2 shows a top view of the brush holder 38 in the direction of the arrow II in FIG. 1.
• the center leg 40 of the brush holder 38 is visible, which has two openings 42, 44 for mounting the brush spring 32, 33 following the assembly of the rotor 20 and the commutator 28 in the motor housing 12, or in the gear housing 14 allow.
• the brush holder 38 itself can optionally be mounted before or after the commutator 28.
• Figure 3 shows in a section along the line III-III in Figure 1 in more detail the design of the U-shaped brush holder 38 and the positioning of the two brush springs 32 and 33 with the brushes 30 and 31.
• the brushes 30 and 31 are in this case form-fitting and in addition non-positively connected by gluing or soldering with the brush springs 32 and 33. They can be introduced obliquely from above into the brush holder after assembly of the commutator 28 through the openings 42 and 44 in the brush holder 38, thereby elastically deformed and securely locked and positioned in the position shown in Figure 3.
• the illustration of the electrical contacting of the brush springs 32 and 33 and the brushes 30 and 31 connected to them in a conductive manner is dispensed with in the schematic representation of FIG.

Landscapes

• Motor Or Generator Current Collectors (AREA)
• Motor Or Generator Frames (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40076814

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (8)

• 2007
  • 2007-11-08 DE DE102007053272A patent/DE102007053272A1/de not_active Withdrawn
• 2008
  • 2008-09-12 JP JP2010532521A patent/JP2011504078A/ja not_active Withdrawn
  • 2008-09-12 WO PCT/EP2008/062155 patent/WO2009059827A1/de active Application Filing
  • 2008-09-12 CN CN2008801151891A patent/CN101855795B/zh not_active Expired - Fee Related
  • 2008-09-12 KR KR1020107010086A patent/KR20100096076A/ko not_active Application Discontinuation
  • 2008-09-12 US US12/674,774 patent/US20110043073A1/en not_active Abandoned
  • 2008-09-12 EP EP08804118A patent/EP2210316A1/de not_active Withdrawn

Non-Patent Citations (1)

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