JPH03862Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field) The present invention relates to a motor brush block.

(Background Art) FIG. 3 shows an example of a brush block of a conventional motor. In this brush block, a bearing 22 is disposed at the center of a substantially bottomed cylindrical bearing stand 21, and a pair of locking bosses 2 are arranged around the bearing 22.
3, and through holes 24 and 25 are provided, and a brush body 28 is formed by fixing a brush body 27 made of carbon to a coil spring 26, and one end of each coil spring 26 is passed through the through hole 25 and protrudes to the outside. On the other hand, the coil spring 26 is fixed to the bearing stand 21 using an eyelet 29.

Furthermore, in order to prevent the brush body 28 from being deformed by being pressed by a commutator (not shown) or the like during motor assembly, the other end of each coil spring 26 is attached to a locking boss 23.
The distance between the brush bodies 27 is expanded in advance to be larger than the outer diameter of the commutator, and the through-holes 24 are inserted in order to finally bring the brush bodies 27 into pressure contact with the outer peripheral surface of the commutator.
The brush block is assembled and attached by inserting a pin from the holder and pressing the brush body 27 toward the commutator to separate the tips of the coil springs 26 from the locking bosses 23.

However, this method requires many steps for attaching the brush body 28 and assembling it into the motor body, and has the drawback that it requires a great deal of effort to assemble the motor.

(Purpose of the invention) The present invention was devised to solve the above-mentioned drawbacks, and its purpose is to provide the brush body itself with a locking function, and to connect this brush body to the motor. By releasing the locking function after mounting the brush body on the bearing stand and assembling it into the motor body, the brush body is securely brought into pressure contact with the commutator, thereby facilitating the installation work of the brush body and facilitating assembly of the motor. To provide a motor brush block that eliminates the complexity of work.

(Disclosure of invention) The present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. In the figure, 1 is a substantially cylindrical bearing stand with a short bottom in the axial direction, and a bearing 2 is disposed in the center of the bottom plate 1a. ing. Furthermore, on the bottom plate 1a, spring stands 1b are provided in a protruding manner at positions separated by approximately 180 degrees via the bearing 2, and spring mounting bosses 1c are provided upright on these spring stands 1b, respectively.

Next, B is a brush body including a conductive coil spring 3 and a brush body 5 made of carbon or the like, and the structure thereof will be described in detail below.

That is, among the extending portions 3a and 3c formed by extending both ends of a coiled spring substantially in parallel,
The penetrating portion 3 is formed by bending one extending portion 3a at a substantially right angle.
b is formed, and this penetrating portion 3b is led out to the back side of the husband bearing stand 1 through a through hole 1d bored at 180 degrees apart from each other in the bottom plate 1a, and the other extension of each coil spring 3 is formed. The brush bodies 5 are fixed to the portions 3c inwardly, and these extending portions 3
A locking portion 3d that can be locked to each one of the extending portions 3a is bent and formed at the tip of the portion c.

The brush body B has its center portion covered with the spring attachment boss 1c with each locking portion 3d being locked to the other extension portion 3a against the restoring force of the coil spring 3, and the eyelet 4 is inserted into the bearing stand 1, and in this state the present invention is attached to the motor body.

That is, FIG. 2 is an overall view of a motor using the present invention. In the figure, 6 is a substantially cylindrical case, 7 is a magnet provided on the inner surface of the case, 8 is a bearing stand, 9 is a bearing presser spring, and 10 is a cylindrical case. 11 is a bearing, 11 is a rotor shaft, 12 is an iron core, 13 is a coil, 14 is a commutator fitted near the tip of the rotor shaft 11, 15
1 is a printed circuit board attached to the bearing stand 1, 16 is a rectifier, 17 is a circuit component for noise prevention, 18 is a lead wire, 19 is a connection between the bent portion 3b of the coil spring 3 and the circuit pattern on the printed circuit board 15, Reference numerals 20 and 20 respectively indicate insulating coating portions.

In the present invention, as mentioned above, the coil spring 3
A sufficient space is secured in advance around the bearing 2 by locking the locking part 3d with the other extension part 3a, and the rotor shaft 11 and iron core 1 housed in the case 6 are
2. A brush block according to the present invention is placed over a rotor consisting of a coil 13, a commutator 14, etc.,
The bearing stand 1 is fitted into the opening of the case 6 while the tip of the rotor shaft 11 is inserted into the bearing 2 to be attached.

After that, before soldering the penetrating portion 3b of the coil spring 3 that passes through the bottom plate 1a of the bearing stand 1 to the printed circuit board 15, the tip of the penetrating portion 3b is axially outward (in the direction of arrow A in FIG. 1). Pull. By doing this, the locking part 3d comes off from the extending part 3a and the extending part 3c moves toward the commutator 14 due to the restoring force of the coil spring 3, so that the brush main body 5 fixed inside the extending part 3c are pressed against the outer circumferential surface of the commutator 14 with appropriate contact pressure.

(Effects of the invention) As described above, according to the invention, a conductive coil spring is formed by extending portions extending from both ends of the conductive coil spring, and bending each of these extending portions in approximately the same direction. The brush body includes a penetrating part, a locking part, and a brush body fixed to the extending part in which the locking part is formed, and when the coil spring is attached to the bearing stand, the penetrating part passes through the bearing stand. and is led out to the outside, and the locking portion has a restoring force that presses against the commutator disposed approximately in the center of the bearing stand,
Since the brush body is configured to be removably locked to the extension portion in which the penetration portion is formed, the coil spring that constitutes the brush body itself has a locking function, and when the brush body is attached to the bearing stand, it is possible to This eliminates the need to hook the end of the coil spring onto the locking boss after mounting it on the bearing stand, which has the advantage of simplifying the work of mounting the brush body.

According to the present invention, when the brush is unfolded after being assembled as in the conventional example, there is a risk that the brush body may be deformed depending on the working method.
According to the present invention, it is possible to incorporate the brush body in a locked state, and the brush body holding carbon (the extension part 3
c) There is no risk of force acting on it that would cause deformation;
Therefore, a predetermined contact pressure can be reliably obtained.

Furthermore, the work of press-contacting the brush body to the commutator after it has been attached to the motor body can be done at the same time as connecting the through-hole of the coil spring to the printed circuit board.
This has the effect of greatly simplifying the motor assembly work.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention; Figure 1 is a perspective view, Figure 2 is a partial sectional view of a motor to which the present invention is applied, and Figure 3 is a perspective view of a conventional example. It is a diagram. 1...Bearing stand, 3...Coil spring, 3a, 3c
...Extending part, 3b... Penetrating part, 3d... Locking part,
5... Brush body, 14... Commutator, B... Brush body.

Claims (1)

[Scope of utility model registration request] Extended portions extending from both ends of a conductive coil spring, and a penetrating portion and a locking portion formed by being bent in substantially the same direction from these extended portions;
A brush body is provided, which includes a brush body fixed to an extended portion in which the locking portion is formed, and when the coil spring is attached to the bearing pedestal, the penetrating portion passes through the bearing pedestal and is led out to the outside. , the locking portion is removably locked to the extension portion in which the through portion is formed while having a restoring force to press against the commutator disposed approximately in the center of the bearing stand; A motor brush block featuring: