JPS639251Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor brush holder, and more particularly to a motor brush holder equipped with a pulse generator.

Conventionally, a brush holder for a motor without a pulse generator is constructed by assembling a metal brush holding frame 2.2 to a brush holder stay 1 punched out of a phenol resin plate, etc., as shown in FIG. A spring 3.3 and a brush 4.4 are housed in the frame 2.2, and the brush holder 1 is fixed to the frame 5.
The brush 4.4 is pressed against the commutator 7 of the rotor 6. During assembly, the brush 4. is biased by the spring 3.3 and tends to pop out.
4, the pigtail 9.9 fixed to the brush 4.4 is hooked onto the boss 8.8 cut and raised from the brush holding frame 2.2, and after the rotor 6 is assembled, the pigtail 9.9 is fixed to the brush 4.4. , and press the brush 4.4 against the commutator 7.

The present invention provides a novel brush holder that uses a rotor having the above-described motor structure and a slip ring 10 for generating pulses attached thereto as shown in FIG. 1B.

Pulses are generated by placing two brushes in sliding contact with the slip ring 10, applying electricity between the brushes, and generating two pulses per motor rotation by two slits formed in the slip ring 10 with a phase angle of about 90 degrees. However, since the slip ring 10 is attached to the tip of the commutator 7 for power supply, when the rotor 6 is attached to the frame 5, the second brush 30 is attached to the narrow part of the frame 5 as shown in FIG. It is located at the back of the place and is difficult to wire and assemble.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In Figure 2 A, 30 is the slip ring 10.
A second brush in sliding contact is electrically connected by a pigtail 32 to the lead lug 19 or 22 of the conductor plate. Reference numeral 12 denotes a brush holder that holds the second brush 30 and is integrally molded from synthetic resin. A pair of brush storage chambers 14 are formed facing each other, and an open window 13 is formed on the back surface, allowing the brush holder 12 to be integrally molded. Furthermore, a boss 33 is formed protruding from the outside of the brush storage chamber 14 to hook a pigtail 32 during assembly, which will be described later. 16 is the assembly leg and the commutator 7
This is the part that is fixed to the first brush holder 1.

Next, assembly will be explained. As shown in FIG. 2B, the second brush holder 12 is stacked on the already assembled first brush holder (the same as in FIG. Ru. One end of the lead lug 19.22 to which the pigtail 32 is spot-welded is inserted into the brush storage chamber 14 so as to close the open window 13 of the brush storage chamber 14, and then the spring 31 is inserted from the inner peripheral side of the second brush holder 12. After putting the brush 30 into the brush storage chamber, the pigtail 32 fixed to the brush 30 is hooked onto the boss 33 to resist the biasing force of the spring 31. The other end of the lead lug 19 is attached to the first brush holder 1 with a screw 21.
It is fixed at Further, the other end of the lead lug 22 is soldered to one end of a feedthrough capacitor 24 supported by a stay 23 fixed to the first brush holder 1. Then, the first and second brush holders 1.12 are fixed to the frame 5 while being integral with the second brush holder at the back. At this time, one end of the lead lug 19 and the stay 23 are grounded, and one end of the lead lug 22 is connected to the power supply via the feedthrough capacitor 24. After placing the commutator 7 and the slip ring 10 in the center of the first and second brush holders 1.12, each pigtail 9.3
Remove the brush 4.30 from the boss 8.33 on which it was hooked, and attach the brush 4.30 to the commutator 7 and the slip ring 1.
0 respectively.

As described above in detail, the brush holder according to the present invention is used in a motor equipped with a commutator for power supply and a slip ring for pulse generation, and the second brush holder has an assembly leg integrally molded from synthetic resin. It is equipped with a brush storage chamber with an open window formed on the back.The mounting leg is fixed to the first brush holder, the pigtail is connected to the lead lug that closes the open window at one end, and the other end of the lead lug is connected to the outside. Because of this structure, it is possible to completely insulate the brush that slides into contact with the slip ring located deep inside the frame. In addition, the open window created by integral molding is closed with a lead lug, and wiring is made easier by using it as an external connection terminal.A pigtail can be connected to the lead lug, and the pigtail can be hooked to the boss. By keeping the rotor in place and unhooking the pigtail after assembling the rotor, assembly in a narrow space can be facilitated.

[Brief explanation of the drawing]

FIG. 1A is a structural diagram of a conventional brush holder. FIG. 1B is a structural diagram of a rotor having a commutator and a slip ring. Figure 2 A, B, and C are
FIG. 2 is a structural diagram of a brush holder according to the present invention. Figure 3 shows
FIG. 3 is an explanatory diagram for assembling the brush holder according to the present invention. 1: Brush holder, 2: Brush holding frame, 3: Spring, 4: First brush, 5: Frame,
6: rotor, 7: commutator, 8: boss, 9:
pigtail, 10: slip ring, 11: rotor, 12: second brush holder, 13: open window,
14: Brush storage chamber, 16: Assembly leg, 17:
Rivet, 19.22: Lead lug, 20: External wiring, 23: Stay, 24: Capacitor, 25:
Tool, 30: Second brush, 31: Spring,
32: Pigtail, 33: Boss, 21.34: Screw.

Claims (1)

[Scope of utility model registration request] A commutator 7 that supplies current to a coil wound around a rotor 11 and a slip ring 10 that generates pulses as the rotor 11 rotates are stacked in the axial direction, and are in sliding contact with the commutator 7 and the slip ring 10, respectively. In a motor including first and second brushes 4 and 30, a first brush holder 1 that holds the first brush 4 and a second brush holder 1 that holds the second brush 30
2 and the second brush holder 1.
2 is a brush storage chamber 14 integrally molded with synthetic resin.
and an assembly leg 16 are provided around the ring-shaped base, and the assembly leg 16 connects the first brush holder 1.
The brush storage chamber 14 has an open window 1 on the back.
3 is opened, and a boss 33 protruding toward the first brush holder 1 side is integrally formed, and this open window 13 is connected to the lead lug 1 to which the pigtail is connected.
A brush holder characterized in that one ends of lead lugs 9 and 22 are closed to bias the brush 30 against a slip ring 10 via a spring 31, while the other ends of lead lugs 19 and 22 are externally connected.