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GB2094561A - Electric motor brush gear - Google Patents

Electric motor brush gear Download PDF

Info

Publication number
GB2094561A
GB2094561A GB8206965A GB8206965A GB2094561A GB 2094561 A GB2094561 A GB 2094561A GB 8206965 A GB8206965 A GB 8206965A GB 8206965 A GB8206965 A GB 8206965A GB 2094561 A GB2094561 A GB 2094561A
Authority
GB
United Kingdom
Prior art keywords
motor
locking means
brush
electric motor
end cap
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
Application number
GB8206965A
Other versions
GB2094561B (en
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.)
Mabuchi Motor Co Ltd
Original Assignee
Mabuchi Motor Co Ltd
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 Mabuchi Motor Co Ltd filed Critical Mabuchi Motor Co Ltd
Publication of GB2094561A publication Critical patent/GB2094561A/en
Application granted granted Critical
Publication of GB2094561B publication Critical patent/GB2094561B/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00Rotary current collectors, distributors or interrupters
    • H01R39/02Details for dynamo electric machines
    • H01R39/38Brush holders
    • H01R39/39Brush holders wherein the brush is fixedly mounted in the holder
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14Means for supporting or protecting brushes or brush holders
    • H02K5/143Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/145Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00Rotary current collectors, distributors or interrupters
    • H01R39/02Details for dynamo electric machines
    • H01R39/42Devices for lifting brushes
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2205/00Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/06Machines characterised by means for keeping the brushes in a retracted position during assembly

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Motor Or Generator Frames (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

An electric motor comprises brush devices each having a brush arm biased for operative contact with a commutator flexible locking means 11 enabling each arm to be locked at a position spaced from the motor axis during assembly of the motor, and access 12 through the motor case allowing engagement of a tool with the respective locking means to bend same sufficiently to allow disengagement of the corresponding brush arm from the locking means following assembly of the motor. <IMAGE>

Description

SPECIFICATION Electric motor DESCRIPTION This invention relates to electric motors.
In accordance with this invention, there is provided an electric motor, in which the brush gear comprises a plurality of brush devices each including a brush arm biased towards the axis of the motor for operative contact of the brush device with a commutator in use of the motor, and in which flexible locking means are provided enabling each brush arm to be locked at a position spaced from the motor axis during assembly of the motor, access being provided through the motor case in the region of each said locking means for engagement of a tool with the respective locking means to bend same sufficiently to allow disengagement of the corresponding brush arm from the locking means following assembly of the motor.
The invention is hereinafter more particularly described by way of example only with reference to the accompanying drawings, in which: Fig. 1 is a side elevational view, partly in section, of an embodiment of small electric motor; Fig. 2 is a perspective view of one embodiment of brush device which may be utilised in the electric motor of Fig. 1; Fig. 3 is a plan view of an embodiment of motor casing end cap which we have previously considered for use in the electric motor of Fig. 1; Fig. 4 is an explanatory diagram illustrating disengagement of a brush arm from a projection during assembly of the motor of Fig. 1; Fig. 5 is a view generally similar to that of Fig. 3 of an end cap with associated brush gear in an embodiment of electric motor constructed in accordance with the present invention;; Fig. 6 is an explanatory diagram useful in expiaining the operation of the locking means in the embodiment of Fig. 5; and Fig. 7 is a perspective view, partly broken away, showing a brush arm of the embodiment of Figs. 5 and 6 in its locked position.
The small electric motor illustrated in Fig. 1 has one or more permanent magnets 1 fiexedly mounted on the interior of the motor casing 2. The motor rotor 3 is mounted on a motor shaft which passes through one end wall of the casing and through an end cap 4 at the other axial end of the motor, the shaft being supported by bearings 5. by referring to a motor casing provided with an end cap or closure member therefor, we intend to include not only arrangements in which the motor casing may have a simple cap at one end, but also arrangements where the casing may effectively be provided in two parts, a major portion and a minor portion.
A commutator 6 mounted on the rotor 3 is arranged for contact with brushes 7A of brush devices 7 which are here shown mounted on the end cap 4. Each brush device 7 comprises the brush proper 7A, a brush base 7B, a terminal portion 7C and a brush arm 7D, as shown in Fig. 2.
The brush arm 7D is bent and the brush 7A, which may, for example, be made of carbon, is mounted near the tip 7E thereof. As shown in the plan view of Fig. 3 (which shows an arrangement which we have previously considered but now consider iess satisfactory and is not in accordance with the present invention) the end cap 4 hasa plurality (two in the figure) of the brush devices 7 mounted thereon so that the terminals 7C protrude outward from the through-holes.
The brush arm is biased so that, in the assembled state of the motor, the brush arm 7D, when relaxed, would take the state shown by broken lines in the upper half of the figure to ensure positive contact between the brush 7A and the commutator 6. This makes it difficult to interpose the commutator 6 between the brushes 7A after the motor has been assembled, and to bring the brushes 7A into the state shown by broken lines in the lower half of the figure. To achieve this, it is necessary to spread out, prior to assembly, the brush arms 7D in the radial direction as shown by an arrow in the figure. As a means to hold the brush arms 7D open, we have previously considered providing projections 8 at predetermined positions on the small case 4 near the outer periphery thereof.A part (here: the tip 7E) of the brush arm 7D is engaged with the projection 8 to afford room to permit the commutator 6 to be interposed between the brushes 7A. After the end cap 4 is engaged with the major portion 2 of the motor casing, a tool 1 0, such as a pin provided in a motor assembly jig, is inserted into respective jig insert holes 9 provided through the end cap 4 (Figs. 3, 4) from the exterior to push the brush arm 7D sideways to the position shown by broken lines in Fig. 4 where it may clear the projection 8. This causes the brush arm 7D to disengage from the projection 8, and to move to the position shown by broken lines in the lower half of Fig. 3 by its own resiliency to press against the commutator 6.
With this arrangement, however, as the brush arm 7D is pushed by the tool 10 to the position shown by broken lines in Fig. 4 to disengage from the projection 8, as described above, force is applied to the brush arm 7D in the direction shown by an arrow in Fig. 4. We have found that this may result in the brush arm 7D becoming twisted or bent, leading to improper contact between the brush 7A and the commutator.
The present invention aims to overcome this problem, as will now be explained.
In Figs. 5 to 7 which illustrate the present invention, the same numerals as in Figs. 1 to 4 refer to like parts throughout. It will be seen that the embodiment of Figs. 5 to 7 differs from that of Figs. 3 and 4 in the provision of locking means here in the form of locking pieces 11 made of a flexible material, for example, of a thermoplastic synthetic resin. The locking pieces 11 are suitably formed integrally with the end cap 4 or other closure member, being made of the same material thereas, or may be fixed to the end cap 4 by screws or other appropriate means. The locking pieces 11 are provided in appropriate locations and formed in appropriate size and shape, for example in the strip shape illustrated, so as to engage with the tip 7E of the brush arm 70.
Access in the form of a jig insert hole is provided through the end cap 4 in the region of each said locking piece 1 the arrangement being such that the locking piece 11 may be caused to slightly bend by inserting a tool 10 into the jig insert hole 12 from the exterior.
The small electric motor is assembled in the following manner: When the end cap is to be engaged with the major portion of the motor case, the brush arms 70 are bent by hand or by toois (such as a pair of pincers) in the direction shown by arrow A in Fig.
5 to bring the tip 7E of the brush arm 70 into locking engagement with the tip of the locking piece 11.
In this state, the rotor 3 is placed in the motor case 2, the rotating shaft of the rotor is inserted into the bearing of the end cap 4, and the end cap 4 is engaged with the main portion 2 of the motor case.
After that, the tool 10 is inserted into the jig insert hole 12 from the exterior, as shown in Fig. 6, to cause the locking piece 11 to bend slightly, as shown by the broken line in that figure, to release the brush arm 70 from the locking piece 1 The brush 7A returns toward the motor axis into engagement with the commutator 6 by the resiliency of the brush arm 70. Insertion of the tools 10 into the jig insert holes 12 can be arranged to follow immediately upon engagement of the motor case 2 and end cap 4, thereby substantially reducing motor assembly operations.
With the procedure described above, the brush arms are bent only in the radial direction relative to the motor axis and within the range of the resiliency thereof. This avoids lateral twisting, such as shown in Fig. 4, and unwanted deformation of the brush arms. The present invention makes it possible to maintain the proper shape and resiliency of the brush arms, to ensure stable contact of the brushes with the commutator, leading to consistent motor performance.

Claims (5)

1. An electric motor, in which the brush gear comprises a plurality of brush devices each including a brush arm biased towards the axis of the motor for operative contact of the brush device with a commutator in use of the motor, and in which flexible locking means are provided enabling each brush arm to be locked at a position spaced from the motor axis during assembly of the motor, access being provided through the motor case in the region of each said locking means for engagement of a tool with the respective locking means to bend same sufficiently to allow disengagement of the corresponding brush arm from the locking means following assembly of the motor.
2. An electric motor according to Claim 1, wherein each said locking means comprises a strip-shaped locking piece the end of which is adapted to engage with the tip of the respective brush arm in the locked condition.
3. An electric motor according to Claim 1, wherein each said locking means comprsies a generally hammer-shaped locking piece.
4. An electric motor according to Claim 1 provided with a motor case which has a separate end cap or closure member at one end thereof, and wherein the brush gear is mounted on said end cap or closure member, wherein the locking means comprise respective locking pieces integrally formed with and of the same material as the end cap or closure member, and wherein access to the region of each said locking means is provided by respective jig insert holes formed through the axial end face of the end cap or closure member.
5. An electric motor substantially as hereinbefore described with reference to and as shown in Figs. 1,2,5,6 and 7 of the accompanying drawings.
GB8206965A 1981-03-10 1982-03-10 Electric motor brush gear Expired GB2094561B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1981032251U JPS6334453Y2 (en) 1981-03-10 1981-03-10

Publications (2)

Publication Number Publication Date
GB2094561A true GB2094561A (en) 1982-09-15
GB2094561B GB2094561B (en) 1985-02-06

Family

ID=12353788

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8206965A Expired GB2094561B (en) 1981-03-10 1982-03-10 Electric motor brush gear

Country Status (3)

Country Link
JP (1) JPS6334453Y2 (en)
GB (1) GB2094561B (en)
HK (1) HK65885A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0244252A2 (en) * 1986-05-02 1987-11-04 Johnson Electric Industrial Manufactory Limited Brush gear for an electric motor
US4893043A (en) * 1987-02-16 1990-01-09 Johnson Electric Industrial Manufactory Limited Brush protection in an electric motor
US4916347A (en) * 1987-05-21 1990-04-10 Ecia - Equipements Et Composants Pour L'industrie Automobile Brush-holder plate in particular for an electric motor
US5495134A (en) * 1993-09-20 1996-02-27 Itt Automotive Electrical Systems Inc. Dynamoelectric brush holder
EP0884810A2 (en) * 1997-06-13 1998-12-16 Itt Manufacturing Enterprises, Inc. Carbon brush for electrical machines
FR2885748A1 (en) * 2005-05-10 2006-11-17 Arvinmeritor Light Vehicle Sys DC motor commutator housing for power window of vehicle, has clasps that maintain strips in retracted position to maintain brushes in mounting position and activated by rods during mounting of motor, where strips are electrically conductive
FR2897992A1 (en) * 2006-02-24 2007-08-31 Arvinmeritor Light Vehicle Sys Direct current electric motor assembly device, has carrier member with mechanical elements to retain brush holders in assembly position outside of central passage, where holders urge brushes into contact position
US7994682B2 (en) * 2007-02-06 2011-08-09 Mabuchi Motor Co., Ltd. Brush device for motor
FR3087592A1 (en) * 2018-10-17 2020-04-24 Valeo Systemes Thermiques ASSEMBLY FOR A MOTOR VEHICLE PULSER

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011193657A (en) * 2010-03-15 2011-09-29 Sanwa Techno:Kk Dc-motor brush

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0244252A2 (en) * 1986-05-02 1987-11-04 Johnson Electric Industrial Manufactory Limited Brush gear for an electric motor
EP0244252A3 (en) * 1986-05-02 1988-03-02 Johnson Electric Industrial Manufactory Limited Brush gear for an electric motor
US4883998A (en) * 1986-05-02 1989-11-28 Johnson Electric Industrial Manufactory, Limited Brush gear for an electric motor
US4893043A (en) * 1987-02-16 1990-01-09 Johnson Electric Industrial Manufactory Limited Brush protection in an electric motor
US4916347A (en) * 1987-05-21 1990-04-10 Ecia - Equipements Et Composants Pour L'industrie Automobile Brush-holder plate in particular for an electric motor
US5495134A (en) * 1993-09-20 1996-02-27 Itt Automotive Electrical Systems Inc. Dynamoelectric brush holder
EP0884810A2 (en) * 1997-06-13 1998-12-16 Itt Manufacturing Enterprises, Inc. Carbon brush for electrical machines
EP0884810A3 (en) * 1997-06-13 2000-01-12 Itt Manufacturing Enterprises, Inc. Carbon brush for electrical machines
FR2885748A1 (en) * 2005-05-10 2006-11-17 Arvinmeritor Light Vehicle Sys DC motor commutator housing for power window of vehicle, has clasps that maintain strips in retracted position to maintain brushes in mounting position and activated by rods during mounting of motor, where strips are electrically conductive
FR2897992A1 (en) * 2006-02-24 2007-08-31 Arvinmeritor Light Vehicle Sys Direct current electric motor assembly device, has carrier member with mechanical elements to retain brush holders in assembly position outside of central passage, where holders urge brushes into contact position
US7629722B2 (en) 2006-02-24 2009-12-08 Arvinmeritor Light Vehicle Systems - France Electric motor assembly device
US7994682B2 (en) * 2007-02-06 2011-08-09 Mabuchi Motor Co., Ltd. Brush device for motor
FR3087592A1 (en) * 2018-10-17 2020-04-24 Valeo Systemes Thermiques ASSEMBLY FOR A MOTOR VEHICLE PULSER

Also Published As

Publication number Publication date
HK65885A (en) 1985-09-06
GB2094561B (en) 1985-02-06
JPS6334453Y2 (en) 1988-09-13
JPS57146758U (en) 1982-09-14

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970310