JP4477180B2 - motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor used for calling a portable wireless communication device such as a mobile phone, a PHS, or a pager, or transmitting a time signal of a wristwatch.
[0002]
[Prior art]
FIG. 8 shows a perspective view of the peripheral portions of the brushes 115-1 and 115-2 of the conventional motor. Furthermore, FIG. 9 shows a front view of the brushes 115-1 and 115-2 with respect to FIG.
[0003]
The commutator 113 is composed of five commutator pieces, and the five commutator pieces are arranged adjacent to each other in the circumferential direction. The five commutator pieces are electrically connected to coil conductors (not shown). The brushes 115-1 and 115-2 are made of a plate-like conductive metal. Brush joint portions 123-1 and 123-2 are provided at the base ends of the brushes 115-1 and 115-2. The brush joints 123-1 and 123-2 are electrically connected to the conductive terminals 117-1 and 117-2. The conductive terminals 117-1 and 117-2 are electrically connected to an external power source and supply power to the motor.
[0004]
The brushes 115-1 and 115-2 are divided into two forks from the brush joint portions 123-1 and 123-2 in the distal direction. The front end of the brush 115-1 is divided into two parts, brush sliding contact parts 124-1a and 124-1b. The tip of the brush 115-2 is divided into two forks, the brushes 124-2a and 124-2b.
[0005]
The contact points between the brush sliding contact portions 124-1a and 124-1b and the commutator 113 and the contact points between the brush sliding contact portions 124-2a and 124-2b and the commutator 113 are centered on the rotation center of the rotating shaft 103. It is located 180 degrees symmetrical.
[0006]
[Problems to be solved by the invention]
Some small motor brushes are thin. For this reason, it is a problem that the tip of the brush is scattered during the transportation of the brush or the assembly work of the motor.
[0007]
Solving the above problem is a problem to be solved by the present invention.
[0008]
[Means for Solving the Problems]
In order to solve the problems of the present invention, the invention described in claim 1 is a motor including a pair of brushes for supplying power that are in sliding contact with a commutator, wherein the brush is plate-shaped and a plurality of brushes are provided along the longitudinal direction thereof. A part of the divided part is integrally connected by a connecting part provided in the middle of the longitudinal direction, and the brush has a circular arc part formed along the longitudinal direction and a tip continuous to the circular arc part. A linear portion provided on the side, a bent portion is formed between the arc portion and the linear portion, the linear portion slides on the commutator, and the arc portion is a linear portion. Ru Ah provided is an arc protruding in the direction away from the linear portion, a bending portion straight portion from the arc portion is bent at an acute angle, the arc portion side of the connecting portion is bent portion at a position facing the It is characterized by that.
[0009]
According to the present invention, by providing the connecting portion in the divided portion, it is possible to reduce the frequency of occurrence of brush scattering during transportation of the brush or handling of the brush during motor assembly.
[0010]
[0011]
By providing the arc portion, the brush can have a long overall length and can reduce its own spring elastic pressure. For this reason, the contact pressure between the brush and the commutator can be suppressed, and wear due to sliding friction can be suppressed. For this reason, the lifetimes of the brush and the commutator can be further extended.
[0012]
Furthermore, since the brush slides with the commutator at the straight portion, the contact area between the brushes can be reduced, and sliding friction between the brush and the commutator can be suppressed. For this reason, the lifetimes of the brush and the commutator can be further extended.
[0013]
[0014]
The straight portion has good followability to fluctuations in the position of the commutator, and fluctuations at the arc portion are suppressed.
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a sectional view of the motor 1. FIG. 2 shows an exploded perspective view of the motor 1. FIG. 3 shows a view of the inside of the motor 1 as viewed from the direction of the rotary shaft 3. FIG. 4 is a cross-sectional view of the brush holder 16 portion of the motor 1. FIG. 5 is a perspective view of the periphery of the brushes 15-1 and 15-2 of the motor 1. FIG. 6 shows a side view of the brush 15 of the motor 1. FIG. 7 shows a front view of the brush 15 of the motor 1.
[0015]
The motor 1 includes a motor body 30 and a weight 2. A weight 2 is fixed to the rotating shaft 3 of the motor body 30. The weight 2 is eccentric with respect to the rotating shaft 3, and the weight 2 rotates with the rotation of the rotating shaft 3 to generate vibration. The motor body 30 includes a bearing 5 at one end and a brush holder 16 at the other end. The bearing 5 and the bearing portion 18 of the brush holder 16 are located at both ends of the motor main body 30. A bearing insertion portion 6 into which the bearing 5 is inserted is provided at one end portion of the motor housing 7. The bearing 5 is fixed to the bearing insertion portion 6 by press-fitting or bonding.
[0016]
The magnet yoke 8 includes a magnet yoke press-fitting portion 21 at the tip, and a magnet yoke protruding portion 22 at the lower portion. The magnet yoke 8 is made of a magnetic material. A rotation shaft insertion hole 11 is provided at the center of the magnet yoke 8, and the rotation shaft 3 passes through the rotation shaft insertion hole 11.
[0017]
The magnet 10 has a cylindrical shape. A through hole of the magnet 10 is press-fitted into the magnet yoke 8. The magnet yoke press-fit portion 21 is press-fitted into the lower portion of the bearing portion insertion portion 6. The magnet yoke protruding portion 22 contacts the motor housing 7 to position the motor housing 7 and the magnet yoke 8.
[0018]
The coil 9 is a cylindrical cup type coreless type. It is located in the space between the magnet 10 and the motor housing 7 and rotates. A commutator hub 12 is fixed to the lower end portion of the coil 9 in the axial direction. Since the commutator hub 12 is fixed to the rotating shaft 3, the coil 9 rotates and the rotating shaft 3 and the weight 2 rotate.
[0019]
The commutator hub 12 is formed of a plastic resin such as polyethylene terephthalate or liquid crystal polymer. A commutator 13 is fixed to the commutator hub 12. The commutator 13 includes five commutator pieces, and the five pieces are electrically connected to the coil 9. The five commutator pieces are arranged adjacent to each other in the circumferential direction of the rotating shaft.
[0020]
The commutator 13 is fixed to the commutator hub 12 and the rotating shaft 10 together with a stop ring 14.
[0021]
A brush holder 16 is provided at the lower end opening of the motor housing 7 so as to close the opening. The brush holder 16 is formed of a plastic resin such as polyethylene terephthalate or liquid crystal polymer. There is a through hole at the center of the brush holder 16 to form a bearing. The brush holder 16 includes conductive terminals 17-1 and 17-2. Brushes 15-1 and 15-2 are fixed to the portions of the conductive terminals 17-1 and 17-2 located inside the motor main body 30. The conductive terminals 17-1 and 15-1, and the conductive terminals 17-2 and the brush 15-2 are electrically connected.
[0022]
The brush 15-1 and the brush 15-2 are in sliding contact with the commutator 13. The contact point between the brush 15-1 and the commutator 13 and the contact point between the brush 15-2 and the commutator 13 are located symmetrically about the rotation axis 3. External portions of the motor body 30 of the conductive terminals 17-1 and 17-2 are connected to a power source for driving the motor 1.
[0023]
The state of the sliding contact between the commutator 3 and the brushes 15-1 and 15-2 will be described with reference to FIGS. The brushes 15-1 and 15-2 are largely curved as a whole, and the brush sliding contact portions 24-1 and 24-2, which are tip portions, are in sliding contact with the commutator 13. The brushes 15-1 and 15-2 are made of conductive leaf springs. The commutator 13 is composed of five commutator pieces and is arranged so that the commutator pieces are adjacent to each other in the circumferential direction of the rotating shaft 3. The commutator piece is made of a conductive member.
[0024]
The brush holder 16 includes conductive terminals 17-1 and 17-2 that are molded of plastic resin and penetrate in the direction of the rotation axis 3. Brush joints 123-1 and 123-2 are provided at the base ends of the brushes 15-1 and 15-2. The brush joint portions 23-1 and 23-2 are electrically connected to the conductive terminals 17-1 and 17-2. The conductive terminals 17-1 and 17-2 are electrically connected to an external power source and supply power to the motor 1.
[0025]
The contact points between the brush sliding contact portions 24-1a and 24-1b and the commutator 13 and the contact points between the brush sliding contact portions 24-2a and 24-2b and the commutator 13 are centered on the rotation center of the rotary shaft 3. It is located 180 degrees symmetrical.
[0026]
The brushes 15-1 and 15-2 are divided into two forks from the brush joint portions 23-1 and 23-2 in the distal direction. The tip of the brush 15-1 is divided into two parts, brush sliding contact portions 24-1a and 24-1b. The tip of the brush 15-2 is divided into two forks, brushes 24-2a and 24-2b.
[0027]
The brush sliding contact portion 24-1a and the brush sliding contact portion 24-1b are connected by a connecting portion 19-1. The brush sliding contact portion 24-2a and the brush sliding contact portion 24-2b are connected by a connecting portion 19-2. The connecting portions 19-1 and 19-2 are the same members as the brushes 15-1 and 15-2, and are integrated.
[0028]
The areas of the connecting portions 19-1 and 19-2 are not significantly increased compared to the entire area of the brushes 15-1 and 15-2, so that the spring elastic values of the brushes 15-1 and 15-2 are not greatly increased. Also gets better.
[0029]
The brushes 15-1 and 15-2 include an arc portion and a straight portion. The linear portion includes brush sliding contact portions 24-1a, 24-1b, 24-2a, 24-2b. The brushes 15-1 and 15-2 reduce the contact pressure with the commutator 13 by reducing the spring elasticity. This is to reduce wear caused by sliding between the brushes 15-1 and 15-2 and the commutator 13. Further, by reducing the spring elasticity of the brushes 15-1 and 15-2, the followability to fluctuations in the position of the commutator 13 is improved.
[0030]
The linear portions of the brushes 15-1 and 15-2 are the brush sliding portions 24-1a, 24-1b, 24-2a, and 24-2b, and the contact points between the brushes 15-1 and 15-2 and the commutator 13. The purpose is to reduce the area. If the area is small, the sliding friction between the brushes 15-1 and 15-2 and the commutator 13 becomes small and wear can be reduced.
[0031]
The connecting portions 19-1 and 19-2 are located on the arc portions and the straight portions of the brushes 15-1 and 15-2. This is to prevent the arc portion from being scattered and to make it easier to follow fluctuations in the position of the commutator 13 at the linear portion.
[0032]
【The invention's effect】
According to the present invention, by providing the connecting portion in the divided portion, it is possible to reduce the frequency of occurrence of brush scattering during transportation of the brush or handling of the brush during motor assembly.
[0033]
By providing the arc portion, the brush can have a long overall length and can reduce its own spring elastic pressure. For this reason, the contact pressure between the brush and the commutator can be suppressed, and wear due to sliding friction can be suppressed. For this reason, the lifetimes of the brush and the commutator can be further extended.
[0034]
Furthermore, since the brush slides with the commutator at the straight portion, the contact area between the brushes can be reduced, and sliding friction between the brush and the commutator can be suppressed. For this reason, the lifetimes of the brush and the commutator can be further extended.
[0035]
The straight portion has good followability to fluctuations in the position of the commutator, and fluctuations at the arc portion are suppressed.
[Brief description of the drawings]
FIG. 1 shows a sectional view of a motor 1. FIG.
FIG. 2 is an exploded perspective view of a motor 1. FIG.
FIG. 3 shows a view of the inside of the motor 1 as viewed from the direction of the rotary shaft 3;
4 is a cross-sectional view of a brush holder 16 portion of the motor 1. FIG.
FIG. 5 is a perspective view of the periphery of the brushes 15-1 and 15-2 of the motor 1. FIG.
6 shows a side view of the brush 15 of the motor 1. FIG.
7 shows a front view of the brush 15 of the motor 1. FIG.
FIG. 8 is a perspective view of the periphery of a brush 115 of a conventional motor.
FIG. 9 shows a front view of a brush 115 of a conventional motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor 2 Weight 3 Rotating shaft 4 Lumirror 5 Bearing 6 Bearing insertion part 7 Motor housing 8 Magnet yoke 9 Coil 10 Magnet 11 Rotating shaft insertion hole 12 Commutator hub 13 Commutators 15, 15-1, 15-2 Brush 16 Brush holder 17-1, 17-2 Conductive terminal 18 Bearing portion 19, 19-1, 19-2 Connecting portion 20 Brush holder 30 Motor body

Claims (1)

In a motor having a pair of brushes for power supply that are in sliding contact with a commutator, the brush is plate-shaped and divided into a plurality along the longitudinal direction, and a part of the divided portion is provided in the middle of the longitudinal direction. And the brush is formed with an arc portion formed along the longitudinal direction and a linear portion provided on the tip side continuous to the arc portion, and the arc portion and the linear portion. A bent portion is formed between the straight portion and the commutator, and the arc portion is formed in an arc protruding in a direction away from the straight portion at a position facing the straight portion. , bends motor, wherein the linear portion from the arc portion is bent at an acute angle, the Oh isosamples provided on the arc portion side of the connecting portion is bent section.

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