JPS58222759A - Brush holder for rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent a brush from wearing or breaking by a lock member by forming a structure that the lock member is not engaged directly with, or isolated from the brush to enable to hold or release the brush. CONSTITUTION:A lock plate 26 is slid in a direction of an arrow X in the state that a brush 6 is mounted on a brush holder 4 together with a brush attaching/detaching unit 5 to release the lock plate 26 from a lock ball 25, thereby enabling to press and contact the brush 6 toward a slip ring 2 via a spring 17. When the brush 6 is removed together with the unit 5 from the holder 4, the lock plate 26 is slid in a direction Y to engage the plate 26 with the ball 25, thereby preferably holding the brush 6 at the unit 5 against the pressing force of the spring 27.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brush holding device for a rotating electric machine, and more particularly to a so-called cartridge-type brush holding device configured to allow brushes to be inspected and replaced even while the rotating electric machine is in operation. .

As this type of brush holding device, the one shown in FIG. 1 has recently been proposed by the present inventors. That is,
a brush holding device 311m that is attached to the bus ring 1 and performs a current collection function together with a rotating current collector such as the slip ring 2;
It mainly consists of a brush holder 4, a brush attachment/detachment device 5, and a carbon brush 6.

As shown in the second r' The main pillar 8 is fixedly attached to the main pillar 8, and a current-carrying socket 11 is fixed to the upper part of the main pillar 8. Note that a notch 7a is formed on the main pillar 8 side of the brush box 7, and the main pillar 8 has a cutout 7a.
A guide groove F3a having a spring main wall guide portion 8b is formed on both side walls near the opening, an opening 8c is formed slightly below the upper end, and a tapered portion 8d is formed on both side walls at the lower end.

@Ki Brush Attachment and Detachment Device 5ii, As shown in FIGS. 3 and 4, the main spring wall 12, the brush support 13 that stores and temporarily holds the brush 6, and the inner body of the brush attachment and detachment device 5 are carried and detached. A handle 14 made of an insulating material for operation, a U-shaped locking fitting 15 for fixing or detaching the brush attaching/detaching device 5 from the brush holder 4, and lifting and holding of the brush 6 in the brush attaching/detaching device 5. Apply a predetermined pressure (generally 100 to 150 g/cm") to the slip ring side by applying a predetermined pressure (generally 100 to 150 g/cm") to the slip ring side.
) and a coiled spring 17 for pressing with a current-carrying knife 18.
2, respectively. In addition, the current-carrying knife 18 is provided with a screw hole (not shown), and by screwing a screw 19 into this screw hole, the terminal operator of the pigtail 20 of the brush 6 can be protected from electric shock or electric shock. An aperture 22 is provided between the spring main wall 12 for protection.
A protective insulating plate 22 made of a transparent synthetic resin material is provided, and the U-shaped fixed locking fitting 151
'i: The operating bar 152, which is an extension of the opening 22a of the protective insulating plate 22 in The U-shaped fixed locking bracket 1 when
5VC, the upper end surface of the main column 8 of the brush holder 4 and the position facing the opening 8C are each provided with a locking tongue piece 15b.
, 15c are integrally formed by punching. Also,
The brush lock member 16 is a leaf spring whose one end is fixed to the spring main wall 12 together with the front brush support 13 by a rivet 24, and its free end, that is, the end on the slip ring side, Brush box side j′
- A locking piece 16a bent into an L shape, and this locking piece 16
Engagement tongue pieces 16b, 16c protrude on both sides of a in a direction opposite to the direction in which the locking piece is bent and such that the distance from the main spring wall 12 increases like a whistle toward the sling ring side.
are each formed integrally. The spring action of the brush locking member 16 always biases the bent end of the locking piece 16a toward the brush box. Therefore, due to this spring action, the L-shaped locking piece 1
The tip of the brush 6a can be inserted into the notch 7a of the brush box 7.

As shown in FIGS. 3 and 4, the brush attachment/detachment device 5 configured as described above inserts the brush 6 into the brush support 13, and the lower surface, that is, the sliding contact surface with the slip ring, is inserted into the brush support 13. While the brush lock member 16 is held by the locking piece 16a, it can be carried freely by gripping the handle 14+i.

When the brush attachment/detachment device 5 holding six brushes is attached to the brush holder 4 shown in FIG. Spring main wall 12 of device 5 (fit both sides of D)
Press the handle 14i toward the slip ring 2 side. In this way, the upper part (operation lever LSa side) of the U-shaped fixed locking metal fitting 15 is bent narrowly in the guide groove a of the main column 8 due to its spring action, but it remains in the fully inserted state, i.e. Each locking tongue piece 15b of the fixed locking fitting 15.

15C are respectively inserted to the position facing the upper end surface of the main column 8 of the brush holder 4 and the opening 8C, the fixed locking metal fitting 15 returns to its original shape by the action of the spring 7, and the locking tongue piece 15
b is locked to the upper end surface of the main column 8, and the locking tongue piece 15C is locked to the opening 8C, so that the brush attaching/detaching device 5 is fixed so as not to move up and down. Here, as shown in FIG. 5, when the spring main wall 12 of the brush attaching/detaching device is inserted along the guide groove 8a of the main column 8 of the brush holder, the brush lock member 16 has an engaging tongue. Piece 16b.

16c begins to come into contact with the tapered portion 8d formed at the lower end of the main pillar 8, and soon this taper M8dVc
As shown in FIG. 6, the free end side of the brush lock member 16 is biased toward the opposite side of the blank box against the spring force. Therefore, the tip of the L-shaped retaining piece 16a separates from the bottom of the brush 6 and unlocks the brush 6. Further, at this time, the current-carrying knife 18 and the current-carrying socket 11 are in a state of meshing with each other.

In this way, the brush attaching/detaching device 5 is attached to the brush holder 4 together with the brush 6, and electrical connections are also made from the slip ring 2 and the pick rotor side to the stator side. That is, the state shown in FIG. 1 is the state.

Next, when detaching the brush attaching/detaching device 5 from the brush holder 4, grasp the second handle 14 of the brush attaching/detaching device and the operating lever 1521t, and move the operating lever 15a against the spring force to the I/y side. , and the locking tongue piece 15C of the fixed locking metal fitting 15 locks with the opening 8C of the brush holder 4. In the released state, pull up the brush attachment/detachment device 5 upward. In this way, the brush attachment/detachment device 5 is released from the brush holder 4 and can be removed. That is, while the brush attaching/detaching device 5 is being pulled upward, the tip (part 8d)
and the engaging tongue pieces 16b, 16C are separated from each other by the taber 13d.
The suppression of the free end side of the brush lock member 16 by the brush lock member 16 is released, and as shown in FIG. Although it is frictionally pressed against the inner wall surface 7b of
When the handle 14 is lifted, the brush attachment/detachment device 5 is detached from the brush holder 4 together with the pusher.

By the way, in such a conventional book holding device,
12 for brush replacement work when the length of the brush is reduced due to wear or damage, inspection of the brush, brush holder, brush attachment/detachment device, or slip ring inspection, etc.
7. The attachment/detachment device is detached, and at this time, a part of the side wall surface 6a of the brush 6 is pressed by the tip of the L-shaped retaining piece 16a of the brush lock member 16, as shown in FIG.

On the other hand, during the lifting operation of the brush attachment/detachment device, the downward suppressing action of the spring 171C is applied to the brush 61. : is stronger than the frictional force between the inner wall surface 7a of the brush box 7,
The brush 2 is pushed downward (in the direction of arrow Q in FIG.
Although the brush 6 does not fall to the side, the side wall surface 6a of the brush 6 is attached to the L-shaped retaining piece 1 of the brush lock member 16 as shown in FIG.
It is scraped off at the tip of 6a, resulting in a concave stepped wear form.

This does not cause much trouble if the number of detachment operations of the brush attachment/detachment device is small, but if the number of detachment operations is high, the brush 6 that is locked to the tip of the L-shaped stopper piece 16a of the brush lock member 16 There was a risk that the bottom part would be completely worn out and the function of the brush attachment to the brush attachment/detachment device would be lost.

Particularly for generators with a large single unit output, a stoppage due to an accident will not affect the surrounding area and will have a very large impact, so a cartridge-type brush holding device is used, which makes it easy to maintain and inspect the brushes even while the generator is in operation. However, on the other hand, brushes are frequently attached and detached, and it is no longer unusual for brushes to be inspected every day. This causes the above-mentioned drawbacks, and even if the brushes are long enough to be used, some brushes cannot be placed on the L-shaped stopper of the brush lock member, which is very uneconomical.

As a countermeasure to this problem, it is possible to increase the length of the bend @1fB (the side that supports the bottom of the brush) of the L-shaped retaining piece 16a that protrudes toward the brush side. Not only does the depth of the brush box have to be increased, but also the force of pressing the brush side wall surface 6a by the tip of the L-shaped stopper 16a increases, and the frictional force between the brush 6 and the brush box inner wall surface 7b increases. Also, a very large force is required to pull out the entire brush layer removing device 5 from the brush holder 4.

The purpose of the present invention is to solve the above-mentioned drawbacks? Another object of the present invention is to provide a cartridge-type brush holding device of this kind, which allows the brush to be smoothly attached and detached without abrading a part of the side wall surface of the brush during the detachment operation of the brush.

In order to achieve this object, the present invention includes a first locking member attached to the brush, and a second locking member attached to the brush attaching/detaching device and capable of being engaged with and detached from the first locking member. A brush lock device is configured, and when the brush is removed from the brush holder together with the brush attachment/detachment device, the second locking member is engaged with the first locking portion to hold the brush, and the brush is held together with the brush attachment/detachment device. The present invention is characterized in that when the brush holder is attached to the brush holder, the second locking part is separated from the first locking member and brought into contact with the current collecting part during full rotation of the brush.

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. 9 and FIG. 1O.

This embodiment differs from the conventional example described above in the brush lock device. That is, in this embodiment, the brush lock member 16 and the tapered portion 8d of the main pillar 8 of the conventional example are omitted, and instead, the lock ball 25 is fixed to the head of the brush 60 via the camp 24, and the protective insulation A lock plate 26 is attached to the upper surface of the plate 22 by a support plate 27 so as to be able to slide in the X and Y directions. The rock ball 25
The retaining groove 25 is wider than the thickness of the lock plate 26.
A plurality of a are formed at intervals fr in the longitudinal direction. Further, the lock ball 25 of the lock plate 26
In the corresponding part, there is a round hole 28a with a diameter larger than the diameter of the lock ball 25, and an elongated hole 28b with a width smaller than the diameter of the lock ball 25 and larger than the width of the retaining groove 25a.
An engagement hole 28 is formed. Note that a lock ball through hole (not shown) having a diameter larger than the diameter of the lock ball 25 is also formed in the purulence-holding insulating plate 22 .

Therefore, as shown in FIG. 9, when the brush 6 is attached to the brush holder 4 together with the brush attachment/detachment device 5, the lock plate 26 is slid in the direction of the arrow
By making the round hole 28aIII (1 minute correspond to the lock ball 25), the lock plate 26 and the lock ball 2
5 can be released and the entire brush 6 can be pressed into contact with the slip ring 2 by the spring 17. Also, brush 6? When attempting to remove the brush from the brush holder 4 together with the brush attachment/detachment device 5, the lock ball 25
Pull up a little with the brush 6 and position the retaining groove 25a and lock plate 26 in the vertical direction! ', then slide the lock plate 26 in the direction of the arrow Y to align the elongated hole 28 of the engagement hole 28, as shown by the dashed line in FIG.
The b portion corresponds to the locking groove 258 portion of the lock ball 25. As a result, the lock plate 26 and the lock ball 2
5 are engaged, so even if the brush 6 is removed from the brush holder 4 together with the brush attachment/detachment device 5, the brush 6 is well held in the brush attachment/detachment device 50 at a predetermined position against the pressing force of the tin ring 17. As a result, the brush attachment/detachment device can be removed and removed without the brush being worn or damaged by the locking member.

As explained above, according to the present invention, it is possible to hold the brush in the brush attaching/detaching device and release it without directly engaging the locking member with the brush and separating it, so that the brush is not worn out by the locking member. The brush can be attached and detached smoothly without any damage.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall configuration of a cartridge-type brush holding device according to an existing proposal, Fig. 2 is a vertical sectional view showing the brush holder portion of the same brush holding device, and Fig. 3 is a brush holder of the same brush holding device. FIG. 4 is a perspective view showing the vicinity of the brush support of the brush holding device, and FIGS. 5 and 6 show the brush holding device during insertion and insertion. A vertical sectional view showing the state of the brush lock member after completion, and FIGS. 7 and 8 are a longitudinal sectional view and a cross sectional view showing the state of the brush lock member relative to the brush while the brush holding device is being detached from the brush attachment/detachment device. , FIG. 9 is a perspective view showing the entire configuration of a cartridge type brush holding device according to an embodiment of the present invention, and FIG. 10 is a perspective view showing the engagement portion between the Kellock ball and the lock plate in the same brush holding device. FIG. 4... Brush holder, 5... Brush attachment/detachment device, 6.
... Brush, 17... Tin ring, 25... Lock ball (first lock member), 26... Lock plate (second lock member).

Claims (1)

[Claims] 1. A brush, a brush holder that slidably holds the brush, a spring member that presses the brush into contact with a rotating current collector, and a spring member that supports the spring member and holds the brush in the brush holder. a brush attachment/detachment device that is detachably attached to the brush attachment/detachment device; and a brush lock device that holds the brush at a predetermined position of the brush attachment/detachment device against the pressing force of the spring member by locking the brush lock device; In the brush lock device, the plan is brought into contact with the rotating current collector by the pressing force of the spring member in a state where the plan is attached to the brush holder by releasing the lock of the brush lock device. is characterized by comprising a first locking member attached to the brush, and a second locking member attached to the brush attaching/detaching device and capable of being engaged with and detached from the first locking member. Brush holding device for rotating electric machines.