JPH0423506B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a DC magnet motor.

Generally, when assembling a cylindrical yoke and a bracket that make up a DC magnet motor, an assembly bolt passes through both, and the tip of the assembly bolt passes through to the outside of the bracket and is secured with a nut. Alternatively, a tap can be cut directly into the bracket and screwed into place. However, in order to penetrate the assembly bolt, the tip of the bolt must reach the bolt hole of the bracket while passing between permanent magnets fixed to the inner peripheral surface of the yoke with a predetermined gap between them. However, as the bolt tip is unavoidably moved in the axial direction through the space described above, it is inevitable that it will fluctuate, so it takes time to locate the bolt hole, which significantly reduces the efficiency of the assembly process. .

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a DC magnet motor that facilitates the assembly work of a cylindrical yoke and a bracket and makes the work more efficient. .

The present invention, which achieves the above object, includes a cylindrical yoke in which a plurality of permanent magnets are fixed with a predetermined gap interposed in the inner circumferential direction, and a bracket fitted to the end of the yoke. In a DC magnet motor that is integrally tightened and fixed with an assembly bolt inserted through the motor, a brush holder is fixed to the bracket at a fixed relative position, and the brush holder is fitted between the permanent magnets. A pair of left and right protrusions extending together to approximately the center position in the axial direction are integrally molded, and a guide path for guiding the assembly bolt to the bolt hole of the bracket is formed between the pair of left and right protrusions. It is characterized by:

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In the figure, 1 is a cylindrical yoke, 2 is a bracket fitted to the end of the yoke, and 3 is an assembly bolt for tightening and fixing the yoke 1 and the bracket 2 together. The assembly bolt 3 passes through the yoke 1 from the head side and is screwed into a bolt hole 2a of a screw hole provided in the bracket 2.

A plurality of permanent magnets 4 are installed on the inner surface of the cylindrical yoke 1.
is fixed with a certain gap 5 interposed in the circumferential direction, and an armature 6 is disposed inside the gap 5, and the armature 6 is supported at both ends by bearings 7 and 8. A commutator 9 is provided on the side of the armature 6, and a brush 10 is in contact with the surface of the commutator 9. The brush 10 has a conductor 13 connected to its side for introducing an external current, is slidably held by a brush holder 14 of a brush holder 11, and has a spring 12 interposed at its bottom.
It is urged toward the commutator 9 by the elastic force of.

As shown in FIG. 4, the brush holder 11 is provided with a pair of brush holding parts 14, 14 at positions facing each other, and fitting recesses 15, 15 are provided at opposing positions intersecting these parts, respectively. A pair of left and right projecting pieces 16, 16 extending from the recesses 15, 15 to the center position in the axial direction are integrally molded. This projecting piece 16 has a guide groove 16a parallel to the axial direction at its center, forming a guide path for guiding the assembly bolt 3. The guide groove 16a is
One end is open toward the fitting recess 15 . Further, at the end of the protruding piece 16 provided with the guide groove 16a, there is a guide notch 16b for facilitating insertion into the gap 5, and a protrusion for absorbing dimensional errors with the gap 5. A groove 16c is provided to impart elasticity to the piece 16.

When assembling the above-mentioned yoke 1, bracket 2, and brush holder 11 together, it is done as follows.

First, when fitting the brush holder 11 to the bracket 2, the fitting recess 15 is fitted into the fitting protrusion 2b provided on the bracket 2 side. By fitting the fitting concave portion 15 and the fitting convex portion 2b,
The brush holder 11 and the bracket 2 are positioned so that they cannot rotate relative to each other in the circumferential direction. Next, when fitting the bracket 2 with the brush holder 11 fitted in this manner to the yoke 1, the projection piece 16 of the brush holder 11 is inserted into the gap 5 between the permanent magnets 4, and the fitting is performed. Through this fitting, the projecting piece 16 is fitted with its both sides in contact with the side walls of the permanent magnet 4, ensuring circumferential alignment between the permanent magnet 4 and the brush 10, and improving the commutation characteristics of the motor.

Furthermore, when the yoke 1, the bracket 2, and the brush holder 11 are assembled as described above, the pair of left and right protrusions 16, 16 extend to approximately the center position of the space 5 between the permanent magnets 4, 4. 〓 between 5 and a pair of left and right 1
The center position of the guide groove 16a between the brackets 6 and 16 is the same, and the bolt hole 2a of the bracket 2 is located in an extension of the common center. Therefore, when the assembly bolt 3 is inserted from the head side of the yoke 1 in this state, the tip of the assembly bolt 3 is automatically guided from the gap 5 to the guide groove 16a and inserted into the bolt hole 2a of the bracket 2. Plugged in.

Therefore, the troublesome task of assembling a conventional DC magnet motor, such as blindly searching for a bolt hole and inserting an assembly bolt, is eliminated, and the efficiency of the assembly work is significantly improved.

Further, as in the above embodiment, if the protruding piece 16 is provided with the longitudinal groove 16c to impart elasticity, even if there is a dimensional error in the gap 5 between the permanent magnets 4, the protruding piece 16 can be It can be assembled by bending, and assembly work efficiency can be improved.

In the above embodiment, a screw hole is provided as the bolt hole 2a provided in the bracket 2, but this bolt hole is made into a through hole that extends to the outside of the bracket 2, and the tip of the assembly bolt is passed through this through hole. It may also be configured such that it is secured with a nut. In addition, in the embodiment, the yoke 1 is shaped like a cylindrical container with a head, but it is also made into a cylindrical shape with openings at both ends, and a bracket is fitted to each end of the cylindrical yoke. Good too.

As described above, the present invention provides a cylindrical yoke in which a plurality of permanent magnets are fixed with a predetermined gap interposed in the direction of the inner circumferential surface, and a bracket fitted to the end of the yoke. In a DC magnet motor that is integrally tightened and fixed with an assembly bolt inserted so as to pass through the motor, a brush holder is fixed to the bracket at a fixed relative position, and a brush holder is attached to the brush holder between the permanent magnets. A pair of left and right protrusions that fit together and extend to approximately the center position in the axial direction are integrally molded, and a guide path for guiding the assembly bolt to the bolt hole of the bracket is formed between the pair of left and right protrusions. Therefore, when assembling the cylindrical yoke and the bracket, the tips of the assembly bolts are guided between the pair of left and right protrusions and automatically reach the bolt holes in the bracket, simplifying the assembly process. It can be done easily and efficiently. Furthermore, since the projecting piece is integrally molded with the brush holder and fits between the gaps between the permanent magnets, it ensures the alignment of the permanent magnets and the brush in the circumferential direction, and improves the commutation characteristics of the motor. I can do it.

[Brief explanation of drawings]

The figures show a DC magnet motor according to an embodiment of the present invention, FIG. 1 is a sectional view taken along the I-O-I arrow in FIG. 3, and FIG. FIG. 3 is a sectional view taken along the - arrow direction in FIG. 2, and FIG. 4 is a perspective view of a brush holder used in the DC magnet motor. 1... Yoke, 2... Bracket, 2a... Bolt hole, 2b... Fitting convex portion, 3... Assembly bolt,
4... Permanent magnet, 5... Gap, 6... Armature, 1
1... Brush holder, 15... Fitting recess, 16...
... Projection piece, 16a... Guide groove (guide path).

Claims (1)

[Claims] 1. A cylindrical yoke in which a plurality of permanent magnets are fixed with a predetermined gap interposed in the direction of the inner circumferential surface, and a bracket fitted to the end of this yoke are inserted so as to penetrate through the gap. In the DC magnet motor, which is integrally tightened and fixed with assembly bolts, a brush holder is fixed to the bracket at a certain relative position, and the brush holder is fitted between the gaps between the permanent magnets to rotate the brush holder in the axial direction. A direct current magnet motor, in which a pair of left and right projections extending to approximately the center of the bracket are integrally molded, and a guide path for guiding the assembly bolt to the bolt hole of the bracket is formed between the pair of left and right projections.