JP2009296823A - Power feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power feeder in which a torsion spring in a brush pressing state can easily recover to a temporary attaching state. <P>SOLUTION: In the power feeder in which a brush 34 contacts a commutator 12A of a rotor to feed power to the rotor, a slit 23 enabling an action side end portion 32a of the torsion spring 32 to come in and out is provided from a rear end side to a front end side on the sidewall of a brush holder body 20 for holding the brush 34 toward the commutator 12A, a retracting groove 24 is provided on one side of the slit 23 in the rear end surface of the body 20, a step portion 25 is provided and a guide 26 protruding to the rear is relatively provided on the opposite side, and the guide 26 is formed like an inclined surface gradually rising to the rear. In the rear end surface of the brush 34, if the brush 34 is pressed backward when an action side end portion 32a of the torsion spring 32 on which a tapered portion 35 narrowing in the rear is changed to be hung from the brush 34 to the retracting groove 24, the action side end portion 32a automatically shifts to the retracting groove 24 by being guided by the guide 26 and by the inclined surface 36 of the tapered portion 35. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power feeding device used for a rotating electrical machine such as a motor or a generator, and more particularly to a structure in which a brush is pressed against a commutator by a torsion spring.

  A conventional power supply device of this type is a power supply device that urges a brush toward a commutator by a torsion spring, and the torsion spring is temporarily installed to avoid contact between the motor commutator and the brush when the motor is assembled. There is one in which a locking portion for stopping is provided on the rear end surface of the brush holder. For example, see Patent Document 1.

JP 2000-333415 A

In a power feeding device provided with a locking portion for temporarily fixing a torsion spring on the upper side of the rear end surface of the brush holder, the operation of operating the end of the torsion spring to drop it from the locking portion into the slit of the brush holder. By carrying out, the brush is pressed by a torsion spring.
In this power supply device, the pressing contact state between the brush and the commutator may be released due to maintenance or the like, and the brush is used as the urging force (elastic force) of the torsion spring in order to return the torsion spring to the temporarily fixed state. On the other hand, two actions (operation or work) for moving the end portion of the torsion spring to the locking portion in the state of being pulled to the opposite side of the commutator are required, so workability is not good.

  The objective of this invention is providing the electric power feeder which can return the torsion spring of a brush press state to a temporary fix | stop state easily.

Typical means for solving the above-described problems are as follows.
(1) A power supply device for supplying a current to a rotor by bringing a brush into contact with the commutator of the rotor,
A brush holder for holding the brush toward the commutator;
A brush holder stay provided with the brush holder;
A torsion spring having an end for pressing and urging the brush toward the commutator;
A spring support provided on the brush holder stay in the vicinity of the brush holder, and
The brush holder is provided with a slit through which the end of the torsion spring can enter and exit from the rear end side toward the front end side, and the rear end surface of the brush holder is located on the second side from the first side of the slit. Is formed relatively long in the brush pressing direction,
The relatively long second side is provided with a guide that is the same as or slightly overlapped with the relatively short slit side end surface of the first side, and is slightly overlapped with the first side.
(2) The back end portion of the brush is provided with a tapered portion that is shorter on the first side than on the second side with respect to the brush pressing direction. Power supply device.
(3) The power feeding device according to (1) or (2), wherein a retracting portion capable of retracting an end portion of the torsion spring is provided on the first side of the rear end surface of the brush holder. .
(4) The power feeding device according to (3), wherein the retracting portion is configured by a groove capable of holding an end portion of the torsion spring.

  According to the said means, the action | operation side edge part of the torsion spring latched by the latching | locking part of a brush rear-end surface can be easily moved to a temporarily fixed state.

  In the present embodiment, the power supply apparatus according to the present invention is configured as shown in FIGS. 1 and 2 as used in a vehicle-mounted motor.

  The motor power supply device 10 includes a brush holder stay (hereinafter referred to as a stay) 11. The stay 11 is made of an insulating resin and is integrally formed in a square plate shape having arc portions at four corners in plan view. The stay 11 has a circular hole at the center, and the circular hole forms a commutator insertion portion 12 through which a commutator 12A provided in the rotor of the motor is inserted.

A plus-side brush holder 13 and a minus-side brush holder 14 are provided so as to project upward in the vertical direction on one end surface (hereinafter, referred to as an upper surface) of the stay 11. Both brush holders 13, 14 are arranged so as to have a phase difference of 90 degrees in the circumferential direction and extend on the normal line of the center of the commutator insertion portion 12.
Since the plus-side brush holder 13 and the minus-side brush holder 14 are formed in the same shape and are arranged symmetrically with respect to the normal line of the commutator insertion portion 12, the configuration will be described below as one plus-side brush holder. 3 will be described with reference to FIG.

As shown in FIG. 3, the plus-side brush holder 13 includes a main body 20, and the main body 20 is formed in a substantially square cylindrical shape. The main body 20 is erected at a right angle on the upper surface of the stay 11, and the main body 20 is arranged so that the cylinder center coincides with the normal line of the commutator insertion portion 12.
The cylinder inner diameter of the main body 20 forms a brush accommodating chamber 21. The brush accommodating chamber 21 is formed in such a size that a brush, which will be described later, can be slidably fitted in a cylinder center direction (hereinafter referred to as an inside / outside direction) and held. The brush housing chamber 21 is open at both the inner and outer end faces.
The main body 20 is integrally provided with a pigtail drawer slit 22 in the ceiling wall, and the pigtail drawer slit 22 extends inward and outward. The main body 20 has a torsion spring slit 23 integrally formed on one side wall, and the torsion spring slit 23 extends inward and outward.
The pigtail lead-out slit 22 and the torsion spring slit 23 are opened at the outer ends with the wall on the side of the commutator insertion portion 12 left.

A groove 24 that can lock the working side end 32a of the torsion spring 32 is recessed in the end face of the side wall of the main body 20 on the pigtail drawing slit 22 side. This groove (hereinafter referred to as a retracting groove) 24 temporarily fixes the working side end 32a of the torsion spring 32 in order to avoid contact between the motor commutator 12A and the brush 34 during motor assembly or maintenance. In this way, a retracting portion that can retract the working side end 32a of the torsion spring 32 is configured.
The side on which the torsion spring slit 23 is provided across the pigtail pull-out slit 22 on the ceiling wall of the main body 20 and the side of the retracting groove 24 on the side wall on which the torsion spring slit 23 is provided are in the inner and outer directions of the main body 20. A step portion 25 having a reduced size is provided. That is, the rear end surface of the main body 20 is formed such that the ceiling wall and the side wall of the portion where the retracting groove 24 is provided are relatively short in the pressing direction of the brush 34.

The rear end surface of the side wall of the main body 20 where the torsion spring slit 23 is opened is the side where the retracting groove 24 is not recessed (hereinafter referred to as the second side) (hereinafter referred to as the second side). The first side is formed relatively long in the brush pressing direction.
A guide 26 is provided on the relatively long second side of the side wall where the torsion spring slit 23 of the main body 20 is opened. The guide 26 approaches the first side which is relatively short from the second side as it goes rearward, and has an inclined surface set to a height that is the same as the first side or slightly overlapped with the first side. Forming.

As shown in FIG. 1 and FIG. 2, a pair of torsion spring support columns (hereinafter referred to as support columns) 30 as torsion spring support portions project from the upper surface of the stay 11 at right angles. . Both support columns 30, 30 are arranged on one side of both brush holders 13, 14. Both support pillars 30 and 30 are formed in the same cylindrical shape. Both support pillars 30 and 30 hold a torsion spring 32 attached to the outside.
The torsion spring 32 is a brush spring obtained by pressing an elastic wire having a circular cross section into a coil shape, and one end constitutes a working side end 32a and the other end constitutes a reaction side end 32b.
On the upper surface of the stay 11, a pair of torsion spring locking columns (hereinafter referred to as locking columns) 31 and 31 project at right angles, and the both locking columns 31 and 31 are a pair of support columns 30 and 31, respectively. 30 are arranged at positions adjacent to each other. The reaction force side end portions 32b of the torsion springs 32 are locked to the locking columns 31, 31 respectively.

A brush 34 slidably contacting the commutator 12A is housed in the brush housing chamber 21 of the brush holder so as to be slidable inward and outward. The brush 34 is a conductor in which brush particles are hardened by a mold and fired. The brush 34 is formed in a rod shape having a substantially square cross section, and resembles a little smaller than the brush accommodating chamber 21. That is, an appropriate clearance is ensured between the brush accommodating chamber 21 and the brush 34.
As shown in FIG. 3, a taper portion 35 that is longer on the first side than on the second side with respect to the brush pressing direction is provided at the radially outer end of the brush 34. That is, the tapered portion 35 forms an inclined surface 36 whose length in the brush pressing direction becomes gradually shorter from the second side toward the first side.

  After the motor is assembled, the working side end 32a of the torsion spring 32 is locked at the position corresponding to the torsion spring slit 23 of the inclined surface 36, and the reaction force side end 32b of the torsion spring 32 is engaged. Locked to the stop column 31. The torsion spring 32 takes a reaction force on the locking column 31 at the reaction force side end portion 32b, and urges the brush 34 at the action side end portion 32a to exert a resilient force, whereby the end surface on the opposite side of the brush 34 (radial direction). Press the inner end face) against the commutator 12A.

On the upper surface of the brush 34, one end of the pigtail 37 is wired near the outer end surface. That is, the pigtail 37 is electrically wired with one end embedded in the brush 34, and the pigtail 37 is disposed closest to the outer end surface of the brush 34 and embedded in the brush 34. The tip is set at a position where it is not exposed from the inclined surface. That is, the pigtail 37 is wired at a position where the effective length of the brush 34 can be ensured most within a range that does not interfere with the inclined surface 36.
The other end of the pigtail 37 is inserted through the pigtail extraction slit 22 and drawn out of the brush housing chamber 21, and is electrically connected to the end of the choke coil 40 as a noise absorbing element of the power supply device 10 by spot welding or the like. Has been.
Reference numeral 50 denotes a power supply terminal for supplying current to the power supply apparatus 10 from the outside.
The choke coil 40 is electrically connected.

  Next, actions and effects of the brush holder and the torsion spring when the motor according to the above configuration is disassembled will be described with reference to FIG.

FIG. 4A shows the time when the commutator 12A is positioned in the commutator insertion portion 12 and the brush 34 is pressed against the commutator 12A.
At this time, the working side end 32 a of the torsion spring 32 is locked at a position corresponding to the torsion spring slit 23 of the inclined surface 36, and the reaction force side end 32 b of the torsion spring 32 is engaged with the locking column 31. Since the torsion spring 32 is stopped, the torsion spring 32 takes a reaction force against the locking column 31 at the reaction force side end portion 32b, and urges the brush 34 at the action side end portion 32a, thereby energizing the brush 34. The opposite end surface (radially inner end surface) is pressed against the commutator 12A.

FIG. 4B shows a time when the torsion spring is returned to the temporarily fixed state for maintenance or the like.
When the inner end face of the brush 34 is pushed by the jig 38 or the like so as to push the brush 34 back, the brush 34 is pushed back in the brush accommodating chamber 21 by the pushing back force F1 of the jig 38. As the brush 34 moves backward, the working side end 32 a of the torsion spring 32 moves in the torsion spring slit 23 and abuts against the guide 26. As the brush 34 is further retracted, the working side end portion 32 a is pushed up by the inclined surface 36 of the brush 34 and the inclined surface of the guide 26 and guided toward the step portion 25.

FIG. 4C shows the time when the torsion spring returns to the temporarily fixed state.
At this time, the working side end 32 a of the torsion spring 32 is temporarily fixed to the retracting groove 24. That is, the working side end 32a of the torsion spring 32 is retracted from the inclined surface 36 of the brush 34 to the retracting groove 24 via the step portion 25, so that the torsion spring 32 does not urge the brush 34 in the pressing direction. It has become.
Further, the brush 34 is prevented from jumping out inward of the brush accommodating chamber 21 by forming (brazing) the pigtail 37.

  According to the embodiment, the following effects can be obtained.

(1) The first side of the slit for torsion spring provided in the brush holder is formed so that the second side is relatively long in the brush pressing direction, and the first side is relatively short to the relatively long second side. By providing a guide that is the same as or slightly overlapped with the slit side end face, the spring to prevent the brush from popping out at the time of maintenance etc. is pressed against the inner end face of the brush, and the action of the torsion spring The side end can be automatically switched to the retracting groove.

(2) Since the working side end of the torsion spring can be automatically switched to the retracting groove for maintenance, etc., the end of the torsion spring is pulled with the brush pulled outward against the urging force of the torsion spring. Compared with a conventional working method that requires two actions (operation or work) for moving the part to the locking part, workability can be improved.

(3) By providing a taper portion at the rear end portion of the brush that is shorter on the first side than on the second side with respect to the brush pressing direction, the inclined surface of the taper portion cooperates with the guide to act as a torsion spring. Since the side end portion is guided to the retracting groove, the working side end portion of the torsion spring can be reliably and automatically locked to the retracting groove.

(4) By providing a retracting portion for locking the working side end of the torsion spring on the first side of the brush holder rear end surface, the working side end of the torsion spring can be securely retracted during maintenance or the like. it can.

(5) By configuring the retracting portion with a retracting groove, not only can the working end of the torsion spring be retracted reliably, but also the accidental movement of the working end of the torsion spring can be prevented. In addition, the rear end surface of the brush holder and the working side end of the torsion spring can be prevented from protruding, and the retracting portion can be formed integrally with the brush holder.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, the taper portion of the brush rear end portion can be omitted if the working side end portion of the torsion spring can be retracted from the brush rear end portion to the retracting portion.

  The retracting portion is not limited to the groove shape, and may be configured by a flat surface or a protrusion that can lock the working side end of the torsion spring.

It is a top view which shows the electric power feeder which is one embodiment of this invention. It is the right view. (A) is sectional drawing which follows the aa line of FIG. 1, (b) is a right view of (a), (c) is a top view of (a), (d) is a disassembled perspective view. It is each sectional drawing of the brush holder for demonstrating an effect | action, (a) has shown the time when the brush is pressed by the commutator, (b) has shown the time when a torsion spring is returned to a temporarily fixed state. (C) shows the time when the torsion spring returns to the temporarily fixed state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric power feeder, 11 ... Brush holder stay, 12 ... Commuter insertion part, 13 ... Plus side brush holder, 14 ... Negative side brush holder,
12A ... commutator,
DESCRIPTION OF SYMBOLS 20 ... Main body, 21 ... Brush storage chamber, 22 ... Pigtail drawer slit, 23 ... Torsion spring slit, 24 ... Retraction groove (retraction part), 25 ... Step part, 26 ... Guide,
30 ... Torsion spring support column, 31 ... Torsion spring locking column,
32 ... Torsion spring, 32a ... Working side end, 32b ... Reaction force side end,
34 ... Brush, 35 ... Tapered portion, 36 ... Inclined surface, 37 ... Pigtail, 38 ... Jig, 40 ... Choke coil, 50 ... Feeding terminal.

Claims (4)

A power supply device for supplying a current to a rotor by bringing a brush into contact with the rotor commutator,
A brush holder for holding the brush toward the commutator;
A brush holder stay provided with the brush holder;
A torsion spring having an end for pressing and urging the brush toward the commutator;
A spring support provided on the brush holder stay in the vicinity of the brush holder, and
The brush holder is provided with a slit through which the end of the torsion spring can enter and exit from the rear end side toward the front end side, and the rear end surface of the brush holder is located on the second side from the first side of the slit. Is formed relatively long in the brush pressing direction,
The relatively long second side is provided with a guide that is the same as or slightly overlapped with the relatively short slit side end surface of the first side, and is slightly overlapped with the first side.   2. The power feeding device according to claim 1, wherein a taper portion that is shorter on the first side than the second side with respect to the brush pressing direction is provided at a rear end portion of the brush. .   3. The power feeding device according to claim 1, wherein a retracting portion capable of retracting an end portion of the torsion spring is provided on the first side of the rear end surface of the brush holder.   The power feeding device according to claim 3, wherein the retracting portion is configured by a groove capable of holding an end portion of the torsion spring.

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