JPH0636344U - Brush holding device for small electric motors - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a brush holding device with little squareness error and easy neutral adjustment. [Structure] A fan-shaped brush holder 1 and a cup-shaped bracket 2 to which the brush holder 1 is attached. The fan-shaped brush holder 1 is formed by two brushes formed by displacing a 90-degree position in a radial direction. The cup-shaped bracket 2 has sliding grooves 3a and 3b, and the cup-shaped bracket 2 is formed by cutting a part of the cylindrical portion 8 and the bottom portion 9 into a fan shape slightly longer in the circumferential direction than the brush holding body. The brush holder 1 is attached to the brush holder attachment portion 10 of the bracket 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brush holding device for a small electric motor.

[0002]

[Prior art]

 Conventionally, as shown in FIGS. 5 to 7, the plus side brush holding body 15a and the minor side brush holding body 15b are separately configured, and the protrusions 17 formed on the bracket 16 are caulked, and the respective brush holding bodies are crimped. 15a and 15b were fixed to the bracket 16. Further, the neutral adjustment is performed by loosening a fixing screw 18 for fixing the bracket 16 and rotating the bracket 16 by a slight amount in the circumferential direction. In the figure, 19a and 19b are brushes.

[0003]

[Problems to be solved by the device]

 However, in the prior art, two brush holders are required because the plus-side and minus-side brush holders are formed separately, and the brush holder is fixed by caulking the protrusion 17 of the bracket 16. Therefore, there are problems that an error occurs in the squareness between the brushes, and that the bracket 16 has to be loosened to perform the neutral adjustment. The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a brush holding device having a small squareness error and easily performing neutral adjustment.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, a brush holding device of the present invention comprises a fan-shaped brush holder and a cup-shaped bracket to which the brush holder is attached, and the fan-shaped brush holder is displaced by 90 degrees. Has two brush sliding grooves formed in the radial direction, and the cup-shaped bracket is a brush formed by notching a part of the cylindrical part and the bottom part in a fan shape slightly longer in the circumferential direction than the brush holder. A holding body mounting portion is provided, and the brush holding body is mounted on the brush holding body mounting portion of the bracket.

[0005]

[Action]

 Since the plus side brush and the minus side brush are inserted into the brush sliding groove of the integrally formed brush holder, the squareness is ensured without adjustment. Further, the neutral adjustment of the fan-shaped brush holder can be performed by moving only the fan-shaped brush holder on the fan-shaped brush holder attachment portion formed in the cup-shaped bracket in the circumferential direction by a small amount.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the brush holding device comprises a brush holding body 1 and a bracket 2. The brush holder 1 is formed into a fan shape by, for example, aluminum die casting, and has two brush sliding grooves 3a and 3b formed in a radial direction by shifting the position by 90 degrees. Reference numerals 4a and 4b are brush guides forming the tip portions of the brush sliding grooves 3a and 3b. The plus side brush 5a and the minus side brush 5b are inserted and mounted in the brush sliding grooves 3a and 3b. A screw hole 7 is formed in the end surface 6 of the brush holder 1 on the bracket 2 side. On the other hand, the bracket 2 is formed in a cup shape, and a part of the cylindrical portion 8 and the bottom portion 9 is cut out in a fan shape slightly longer in the circumferential direction than the brush holder 1 to form a brush holder mounting portion 10. ing. Further, a spigot portion 11 on which the brush holder 1 is placed and an arc-shaped elongated hole 12 are formed in a portion of the bottom portion 9 of the bracket 2 corresponding to the brush holder attachment portion 10. The center of the arc of the slot 12 is aligned with the center of the bracket 2. In the figure, 13 is a housing portion into which a bearing (not shown) is inserted. The brush holding device having such a structure is assembled as follows. First, the brushes 4a and 4b are inserted and mounted in the brush sliding grooves 3a and 3b of the brush holder 1. Next, the bracket 2 is assembled to the stator after incorporating a rotor (not shown). After that, the brush holder 1 is radially inserted into the brush holder attachment portion 9 of the bracket 2. When the insertion of the brush holder mounting portion 9 into the bracket 2 is completed, the fixing screw 14 is lightly tightened in the screw hole of the brush holder 1 through the elongated hole of the bracket. In this state, the brush holder 1 can slide in the brush holder attachment portion 9 of the bracket 2. This slidable amount is the difference in the circumferential length between the fan-shaped brush holder mounting portion formed on the bracket 2 and the fan-shaped brush holder. The neutral adjustment of the brush is performed by sliding the brush holder 1 on the spigot portion 11 in the brush holder attachment portion 10 in the circumferential direction.

[0007]

[Effect of device]

 The present invention having such a configuration has the following effects. (1) Since the plus-side and minus-side brush holders are integrally formed, the squareness accuracy between the brushes is greatly improved. (2) The neutral adjustment can be easily performed in a short time because the brush holding device is slid in the cylindrical direction. (3) Since the brush holder can be inserted and installed from the radial direction into the brush holding installation part of the bracket, the tip of the brush guide is located on the inner diameter side of the bracket housing part where the bearing is inserted from the axial direction. As a result, the distance from the commutator can be reduced, and the maximum usable length of the brush can be increased.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a brush holding device according to an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a front view showing a brush holder according to an embodiment of the present invention.

FIG. 4 is a front view showing a bracket according to an embodiment of the present invention.

FIG. 5 is a side sectional view showing a brush holding device in a conventional example.

FIG. 6 is a front view of FIG.

FIG. 7 is a rear view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush holder 2 Brackets 3a, 3b Brush sliding groove 4 Brush guide 5a, 5b Brush 6 End surface 7 Screw hole 8 Cylindrical part 9 Bottom 10 Brush holder mounting part 11 Inlay part 12 Long hole 13 Housing part 14 Fixing screw 15a, 15b Brush holder 17 Protrusion 18 Fixing screw 19 Bracket

Claims (1)

[Scope of utility model registration request] 1. A fan-shaped brush holder and a cup-shaped bracket to which the brush holder is attached, wherein the fan-shaped brush holder is two brush slides formed by displacing 90 ° positions in a radial direction. The cup-shaped bracket having a groove has a brush holder attachment portion formed by notching a cylindrical portion and a part of the bottom portion in a fan shape slightly longer in the circumferential direction than the brush holder. A brush holding device for a small electric motor, characterized in that the body is attached to a brush holder attaching portion of the bracket.