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
  • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
  • H01R43/12—Manufacture of brushes
• • 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
  • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
  • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
  • H01R39/22—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof incorporating lubricating or polishing ingredient
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2918—Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/2971—Impregnation
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer

Definitions

• the invention relates to a carbon brush which is impregnated with an impregnating agent, in particular a carbon brush for heavily used tools.
• the invention further relates to a method for impregnating a carbon brush or a carbon bar.
• an impregnated carbon brush for electrical machines with an impregnating agent that contains fat, wax or oil as a lubricant is known.
• the impregnating agents are either liquid or solid at normal temperature and are brought to a temperature equal to or above the melting point of the lubricant in an impregnating bath in which the carbon brush is impregnated.
• the impregnating temperature is set to approximately 100 ° C.
• DE 26 09 834 C3 describes an impregnated carbon brush which, as an impregnating agent, contains a non-melting fat, a non-melting wax or a contains non-flowing oil, the fat, wax or oil of the impregnating agent being intimately mixed with a gelling agent made of montmorillonite flakes, the surfaces of which are coated with long-chain hydrocarbons, and thereby converted into the non-melting or non-flowing, harder and abrasion-resistant state. Impregnation is carried out using the vacuum pressure method.
• Impregnated carbon brushes according to DE 26 09 834 C3 have proven their worth and in their use show advantages in terms of good commutation, less spark interference, long service life and possible use with high performance. However, it would be desirable if there were further advantages with regard to brush wear, collector wear or the collector temperature occurring during operation or the running time of the machine, especially if it is used in machines with temperature-sensitive commutators that are asbestos-free.
• the present invention is based on the problem of developing a carbon brush or a method for impregnating one of the type described above in such a way that further improvements in the mechanical running behavior of the carbon brush can be achieved and, in particular, unproblematic use with asbestos-free commutators is possible. Improved spark suppression and temperature resistance should also be achieved. A solvent should not be used in the impregnation itself. The impregnating agent should also be environmentally friendly.
• the problem is solved with a carbon brush in that the carbon brush is impregnated with a mixture of ester oil and a synthetic hydrocarbon oil.
• the ester oil can preferably be a synthetic ester oil such as carboxylic acid ester or dicarboxylic acid ester.
• the carbon brush is impregnated with an ester oil which has a kinematic viscosity of approximately 14 mm2 / s at 100 ° C and a kinematic viscosity of approximately 63 mm2 / s at 40 ° C.
• the ester oil should also have a density at 20 ° C of about 0.92 g / m3 at 20 ° C.
• a reduction in brush collector wear and a reduction in collector temperature could be achieved in particular if the impregnating agent of the carbon brush is approximately 0.5 to 15 percent by weight, preferably approximately 5 percent by weight.
• the problem is solved by impregnating the carbon brush or the carbon bar in a mixture of ester oil and a synthetic hydrocarbon oil.
• the impregnation with the impregnating agent according to the invention does not have to be carried out by the vacuum pressure method, but that the carbon brush or the carbon bar can only be immersed in the mixture of ester oil and synthetic hydrocarbon oil for a certain period of time.
• the period is preferably between 0.5 and 5 hours, in particular 1.5 to 2.5 hours.
• the carbon brush or the carbon bar is then drained off and then preferably dried by spinning at a temperature between 50 and 90 ° C., in particular approximately at 80 ° C., for a period of about 5 to 20 minutes, preferably of about 10 minutes.
• the carbon brush is then immediately ready for use or the carbon bar could be machined directly to a carbon brush of the desired geometry.
• a carbon brush is immersed in an undiluted synthetic ester oil at room temperature over a period of about 2 hours and then removed to become and drain ester oil. The carbon brush is then spun dry at a temperature of approximately 80 ° C. for 10 minutes. The carbon brush was then immediately ready for use. There was no rinsing.
• a corresponding carbon brush was then installed in a jigsaw to determine the running time, brush wear, collector wear, running time and collector temperature.
• the running tests were then compared to a carbon brush which had been impregnated with known impregnating agents. As a result it could be determined:

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Motor Or Generator Current Collectors (AREA)
• Carbon And Carbon Compounds (AREA)
• Cell Electrode Carriers And Collectors (AREA)
• Pens And Brushes (AREA)
• Inert Electrodes (AREA)
• Ceramic Products (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6497261

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (16)

• 1993
  • 1993-09-09 DE DE4330548A patent/DE4330548C2/de not_active Expired - Fee Related
• 1994
  • 1994-09-03 DE DE59408342T patent/DE59408342D1/de not_active Expired - Lifetime
  • 1994-09-03 EP EP94113829A patent/EP0644632B1/fr not_active Expired - Lifetime
  • 1994-09-03 AT AT94113829T patent/ATE180927T1/de not_active IP Right Cessation
  • 1994-09-03 ES ES94113829T patent/ES2133453T3/es not_active Expired - Lifetime
  • 1994-09-08 US US08/303,034 patent/US5798178A/en not_active Expired - Fee Related

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