JP3487066B2 - Brush holder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder for a commutator motor used for an actuator or a pump of an automobile. 2. Description of the Related Art In recent years, the electrification of automobiles has been advanced and motors have been frequently used, but it has been a long time, but demands for reduction in size and weight have become more severe in terms of energy saving. FIG. 3 is a half sectional view showing the internal structure of a motor using a conventional brush holder, and FIG. 4 is a front view of the conventional brush holder. As shown in FIGS. 3 and 4, a brush box 2 made of a brass plate and a terminal 3 are fixed to the brush holder 1 by caulking or the like. That is, the brush 4 urged in the direction of the rotating shaft 13 is inserted. The spring 5
Usually, a coil spring is used. The pigtail 6 embedded in the brush 4 is fixed to the terminal 3 by welding or the like. The assembled brush holder 1 is sandwiched and fixed between the frame 7 and the bracket 8. When power is supplied to the terminal 3, the coil 10 wound around the core 19 via the brush 4 and the commutator 9
, A torque is obtained by the magnetic flux of the magnet 12, and the rotating shaft 13 held by the bearing 11 rotates to output a torque. [0005] The motor thus constructed is fixed to the main body 14 by means of through bolts or the like. [0006] In the motor having such a conventional brush holder, the bracket 8 is required only for supporting the bearing 11 for transmitting torque, and the weight and length of the motor are required. It was disadvantageous in point. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a brush holder which is a thin, lightweight, and inexpensive motor. [0008] In order to solve this problem, the present invention has a bearing housing integrally formed on one surface of a disk-shaped brush holder, and the outer diameter of the brush holder is The entire circumference or part is larger than the inner diameter of the frame, the inner diameter of the bearing housing is all or partly smaller than the outer diameter of the bearing, and the depth is 1/3 to 1/2 of the bearing width. . DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is made of a synthetic resin, has a disk shape, has a hole at the center for a shaft to penetrate, and has a conductive surface on one surface. A brush housing and a terminal made of metal, a brush made of carbon or carbon as a main material, and a spring made of an elastic body are assembled, and a bearing housing having an opening formed on the other surface integrally formed on the other surface. Wherein the outer diameter of the brush holder is entirely or partially larger than the inner diameter of the frame, the inner diameter of the bearing housing is entirely or partially smaller than the outer diameter of the bearing, and the depth is less. The bearing width is less than half and more than one third of the bearing width. The bearing is pressed into the brush holder and the brush holder is pressed into the frame, so a bracket is required. In other words, the motor can be provided thin, light, and inexpensively. Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a half sectional view showing an internal configuration of a motor using a brush holder according to an embodiment of the present invention, and FIG. 2 (a) is a front view of a brush holder according to an embodiment of the present invention. FIG. 2B is a rear view of the brush holder. As shown in the figure, the assembling of the brush holder 1, brush box 2, terminal 3, brush 4, and spring 5 is the same as that of the conventional example, and the description is omitted. The brush holder 1 is desirably made of a resin such as PET, PBT, PPS, or phenol in consideration of mechanical strength, heat resistance, chemical stability, and the like. The outer diameter 17 of the brush holder is all or partly smaller than the inner diameter of the frame 7,
The brush holder 1 is pressed into the stopper 15 provided on the frame 7. The inner diameter of the bearing housing 18 of the brush holder 1 is smaller than the outer diameter of the bearing 11 over the entire circumference or a part thereof, and the depth of the bearing housing 18 is は to 1 of the width of the bearing 11.
Because of this, the bearing 11 is press-fitted in a state in which it protrudes from the end surface of the bearing housing 18 by 1/3 to 1/2. The motor constructed as described above is fixed to the main body 14 through through bolts or the like. The main body 14 is provided with a main body side bearing housing 16 for supporting the bearing 11 of the motor. 11
Is supported by the main body-side bearing 16. The brush holder 1 is a resin molded product, and is press-fitted by thermal creep (the outer diameter 17 of the brush holder 1, the inner diameter of the frame 7, the housing 18 of the brush holder 1).
It is inevitable that play occurs in the outer diameter of the bearing 11). To avoid this, the brush holder 1 itself is fixed by being sandwiched between the stopper 15 of the frame 7 and the main body 14, and the bearing 11 is supported by the main body side bearing housing 16. Therefore, the outer diameter 1 of the brush holder 1
7, the press-fitting to the inner diameter of the frame 7, bearing 1
The pressure input of the brush holder 1 into the housing 18 may be sufficient to withstand the work (characteristic test, transportation, etc.) until the brush holder 1 is attached to the main body 14. In the above description, since the brush holder itself has the function of the bracket, the motor is inexpensive, thin, and light without a bracket. As described above, according to the present invention, a thin, lightweight and inexpensive motor can be provided because it has a motor function without using a bracket.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing an internal configuration of a motor using a brush holder according to an embodiment of the present invention. FIG. 2 (a) A brush holder according to an embodiment of the present invention. Front view (b) Back view of brush holder according to one embodiment of the present invention [FIG. 3] Half sectional view showing internal structure of motor using conventional brush holder [FIG. 4] Front view of conventional brush holder Description: 1 brush holder 2 brush box 3 terminal 4 brush 5 spring 6 pigtail 7 frame 8 bracket 9 commutator 10 coil 11 bearing 12 magnet 13 shaft 14 body 15 stopper 16 body bearing housing 17 brush holder outer diameter 18 bearing housing 19 core

Continuation of the front page (56) References JP-A-59-117445 (JP, A) JP-A-6-178496 (JP, A) JP-A-5-39156 (JP, U) JP-A-62-182056 (JP , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 13/00 H01R 39/38 H02K 5/14

Claims (1)

(57) [Claim 1] A brush box and terminal made of a synthetic resin, having a disc-like shape, having a hole at the center thereof through which a shaft passes, and a brush box and a terminal made of a conductive metal on one surface. A brush holder comprising a brush made of carbon or carbon as a main material, a spring made of an elastic body, and a bearing housing having an opening formed on the other surface integrally formed on the other surface. The outer diameter of the brush holder is entirely or partially larger than the inner diameter of the frame, the inner diameter of the bearing housing is entirely or partially smaller than the outer diameter of the bearing, and the depth is less than half the bearing width and 3 minutes. A brush holder characterized by at least one of the following.