JP5199729B2 - Power supply device - Google Patents

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

  However, in a power feeding device in which a locking portion for temporarily fixing the torsion spring is provided above the rear end surface of the brush holder, the end portion of the torsion spring is operated and dropped from the locking portion into the slit of the brush holder. When performing the work, if the motor components are located around the part where the motor power supply device is installed, etc., if the work is performed from above, the end of the torsion spring does not enter the slit well. In addition, it may reach the rear end surface of the lower side of the brush holder beyond the opening edge of the slit, and the working side end of the torsion spring may not be locked (contacted) with the brush. It was.

  The purpose of the present invention is to securely lock the working end of the torsion spring temporarily fixed to the locking portion of the brush holder rear end surface from the one side even if the temporary fixing is released by operating from one side. It is in providing the electric power feeder which can be made to do.

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 to the front end side, and the rear end surface of the brush holder is on the opposite side of the slit release operation side. Formed relatively long in the brush pressing direction,
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 release operation side of the rear end surface of the brush holder.
(2) The power feeding device according to (1), wherein the retracting portion is configured by a groove capable of locking an end portion of the torsion spring.

  According to the means (1) and (2), even if the working side end of the torsion spring temporarily fixed to the engaging part of the brush holder rear end surface is operated from one side, the temporary fixing is released. The brush can be securely locked.

  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 open at the outer ends with the wall on the commutator insertion portion 12 side remaining.
At the end of the rear end face of the main body 20 on the pigtail drawing slit 22 side, a groove 24 capable of locking the working side end 32a of the torsion spring 32 is recessed. This groove (hereinafter referred to as a retracting groove) 24 temporarily holds the working side end 32a of the torsion spring 32 in order to avoid contact between the motor commutator 12A and the brush 34 when the motor is assembled. Thus, a retracting portion capable of retracting the working side end portion 32a of the torsion spring 32 is configured.
The side on which the torsion spring slit 23 is provided across the pigtail drawer slit 22 on the ceiling wall of the main body 20 and the retreat groove 24 side on the wall portion 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 retreat groove 24 is provided are relatively short in the direction in which the brush 34 is pressed. The rear end surface of the lower side wall sandwiching the torsion spring slit 23 of the step portion 25 of the main body 20 coincides with the rear end surface of the side wall on the side where the torsion spring slit 23 is not provided. )

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 bar 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.

  A torsion spring locking groove (hereinafter referred to as a locking groove) 36 is integrally embedded in the radially outer end surface 35 of the brush 34. The locking groove 36 has a triangular cross section and is formed in an elongated groove shape having a constant width and a constant depth. The groove width (one side length of the triangle) of the locking groove 36 is smaller than the thickness (diameter) of the working side end 32 a of the torsion spring 32. The locking groove 36 is laid in parallel with the upper and lower surfaces, which are a pair of side surfaces of the brush 34.

  After the motor is assembled, the working side end 32a of the torsion spring 32 is locked to the locking groove 36, and the reaction force side end 32b of the torsion spring 32 is locked to the locking column 31. Yes. 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.

One end of a pigtail 37 is wired near the outer end surface 35 on the upper surface of the brush 34. That is, one end of the pigtail 37 is electrically wired by being embedded in the brush 34, and the pigtail 37 is disposed closest to the outer end surface 35 of the brush 34 and embedded in the brush 34. The leading end is set at a position where it is not exposed from the locking groove 36. That is, the pigtail 37 is wired at a position where the effective length of the brush 34 can be secured most within a range that does not interfere with the locking groove 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 a current to the power supply apparatus 10 from the outside, and is electrically connected to the choke coil 40.

  Next, actions and effects of the brush holder and the torsion spring at the time of assembling the motor according to the above configuration will be described with reference to FIG.

FIG. 4A shows a state before the brush is pressed by the commutator.
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 locking groove 36 of the brush 34, so that the torsion spring 32 does not urge the brush 34 in the pressing direction.

FIG. 4B shows the time when the commutator 12A is positioned in the commutator insertion portion 12 and the brush is pressed against the commutator.
At this time, the working side end 32 a of the torsion spring 32 is pushed from the ceiling wall side of the main body 20, so that the torsion spring 32 is dropped from the retracting groove 24 into the locking groove 36 of the brush 34.
That is, when the working side end 32 a of the torsion spring 32 is pushed from the ceiling wall side of the main body 20, the working side end 32 a is detached from the retraction groove 24 and falls into the rear end opening of the torsion spring slit 23, and the brush 34. The locking groove 36 is locked.
For example, even if the working side end portion 32a of the torsion spring 32 is strongly pressed from the ceiling wall side of the main body 20, the step portion 25 in which the dimensions of the main body 20 in the inner and outer directions are shortened in the portion where the retraction groove 24 is formed. Therefore, the working side end 32a of the torsion spring 32 is guided and locked to the locking groove 36 of the brush 34 by the lower side wall (guide) sandwiching the slit 23 for torsion spring.
In other words, according to the present embodiment, when the brush 34 is pressed against the commutator 12A, the working side end 32a of the torsion spring 32 is reliably moved from the retracting groove 24 for temporary fixing to the locking groove 36 of the brush 34. Can be changed to

  On the other hand, as shown in FIG. 4C, when the rear end surface of the main body 20 is not provided with a step, for example, the working side end 32 a of the torsion spring 32 is formed on the main body 20. When pressed strongly from the ceiling wall side, the working side end portion 32a does not enter the slit 23 for torsion springs well, but reaches the opposite side of the rear end surface of the main body 20 beyond the opening edge. In some cases, the working side end 32 a of the spring 32 cannot be locked in the locking groove 36 of the brush 34.

  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 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 not limited to the case where the working side end of the torsion spring is operated from the ceiling wall side of the brush holder and the temporary fixing is released from the retracting portion. It may be released from the side.
When the working side end portion of the torsion spring is pulled from the bottom wall side and released, the retracting portion is arranged on the ceiling wall side, and the guide is arranged on the opposite bottom wall side.
When the working side end of the torsion spring is pushed and released from the bottom wall side, the retracting part is arranged on the bottom wall side and the guide is arranged on the ceiling wall side which is the opposite side.

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). It is each sectional drawing of the brush holder for demonstrating an effect | action, (a) has shown before pressing a brush with a commutator, (b) has shown the time of pressing a brush with a commutator, (c) Shows a comparative example.

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,
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 ... Outer end face, 36 ... Locking groove (torsion spring locking groove), 37 ... Pigtail,
40: Choke coil, 50: Feeding terminal.

Claims (2)

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 a working side 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
Wherein the brush holder, can slit and out the ends of the torsion spring toward the distal end side provided et been from its rear end,
A rear end surface of the brush holder is provided with a retracting portion configured by a groove capable of locking the working side end portion of the torsion spring, and a portion where the retracting portion is provided on the rear end surface of the brush holder Is a relatively short power supply device. 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 a working side 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 to the front end side,
On the rear end surface of the brush holder on one side wall sandwiching the slit, a retracting portion configured by a groove capable of locking the working side end of the torsion spring is provided,
The rear end surface of the brush holder on one side wall sandwiching the slit provided with the retracting portion is formed relatively short in the brush pressing direction with respect to the rear end surface of the other side wall sandwiching the slit. that, the sheet collector you wherein a.

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