JP2006311781A - Vibration motor with interior mounted with weight, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration motor in which a strong joint state between components can be maintained, improvement in the oscillating output and increase in a product service lifetime can be achieved, and to provide an easy manufacturing process therefor. <P>SOLUTION: The vibration motor includes a stator, in which a stem is fixedly installed at the center of the yoke of a casing, a magnet is inserted into the external surface of the stem and is fixedly coupled; a rotor in which a hub is inserted rotatably in the stem, a coil jointing element and a commutator provided on the magnet exterior of the stator are coupled at both sides of the hub and the weight is coupled to one side outer surface of the coil jointing element; and a brush assembly electrically connected to the commutator and coupled so as to close the opened end of the casing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration motor having a weight mounted therein, and more specifically, the structure is simplified, the connection of each part is solid, the vibration output is improved, the service life of the product is increased, and the production work The present invention also relates to an easy vibration motor and a manufacturing method thereof.

  A vibration motor is a device that couples an eccentric weight on one side of the rotating shaft of the motor and generates vibration by the weight that is eccentric when the weight rotates. Such a device is mainly a mobile phone. It is applied to small vibration generators such as (cellular phone).

  In this way, in the method in which the weight is coupled to the rotating shaft, since the weight is exposed to the outside, the shape becomes larger, and excessive tremors beyond the intended vibration occur, resulting in high friction between parts. The disadvantage is that the service life of the product is extremely short due to its rate and high impact.

  In order to overcome these disadvantages, recently, an internal vibration motor (hereinafter referred to as a motor) configured by directly connecting a weight that eccentrically rotates the weight to one side of a rotor of a motor installed inside the case. Vibration motor) has been proposed and applied.

  FIG. 1 is a cross-sectional view showing a conventional configuration of a vibration motor.

  As shown in FIG. 1, the basic configuration of a conventional vibration motor includes an external case 11, a stator 10 installed on the central axis of the case 11, and the case 11 being rotatable to the outside of the stator 10. It consists of the installed rotor 20.

  The stator 10 includes a bush 12 fixedly coupled to the inside of the case 11 in the form of a hollow tube, and a magnet 13 attached to the outer surface of the bush 12. A bearing 14 for rotating the shaft 21 is installed, and two or more bearings 14 are mounted for stable rotation.

  The rotor 20 is coupled to the inside of the bush 12 to rotate, a hub 22 coupled to one side of the shaft 21, and an outer surface of the hub 22 to face the magnet 13 of the stator 10. The coil assembly 23 is used.

  Here, a flat type commutator 24 is connected to the hub 22 to rectify a current supplied to rotate the rotor 20, and an eccentric weight is provided on one outer surface of the coil assembly 23. A weight 25 for binding is coupled.

  In the drawing, reference numeral 30 denotes a brush assembly including a brush terminal for supplying a current to the rotor 20 and closing one side of the case 11.

  In the conventional vibration motor configured as described above, after the shaft 21 is press-fitted into the bush 12 constituting the stator 10, the hub 22 and the coil combination body 23 are press-fitted and coupled to the shaft 21.

  After performing these steps, the commutator 24 is coupled to the outer surface of the hub 22 and the case 11 is coupled by the brush assembly 30 to complete the assembly of the motor.

  However, since the conventional vibration motor includes a shaft included in the rotor and is supported while the shaft rotates, a separate bush and a large number of bearings in the bush are required. This complicates the configuration and increases the production cost of the product.

  In addition, the coupling state of the shaft supported by the bearing and the state where the bush is fixed and coupled to the case are performed by press-fitting, bonding, welding, or the like at the time of coupling, so that dimensional errors in the process are likely to occur. In addition, since the coupling force is not firm, not only is it difficult to obtain an accurate vibration output when vibration occurs, but also the product service life is shortened due to excessive vibration.

Furthermore, the process of a motor assembled in the order of assembly of the stator, press-fitting of the shaft, press-fitting of the hub and coil assembly, coupling of the commutator, and coupling of the brush assembly is complicated. There is a problem that the work is very difficult because it must be carried out.
JP-A-8-298746

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to maintain a firm coupling state between components, and to improve the vibration output and increase the service life of the product. Is to provide.

  It is another object of the present invention to provide a method of manufacturing a vibration motor that is performed by a simplified process that makes the process for manufacturing the motor easier.

  According to the present invention, a vibration motor having a weight mounted therein has a stator fixedly coupled with a shaft fixedly placed at the center of the yoke of the case, and a magnet sandwiched between the outer surfaces of the shaft; A rotor in which a coil coupling body and a commutator provided on the outer side of the stator magnet are coupled to both sides of the hub and a weight is coupled to one outer surface of the coil coupling body; and the commutator is electrically The brush assembly is connected and joined to close the open end of the case.

  The hub is preferably configured so that synthetic resin is selectively applied, a bearing is press-fitted therein, and a change in the volume of the hub due to the press-fitting of the bearing is minimized.

  According to the present invention, a method of manufacturing a vibration motor having a weight mounted therein includes a step of press-fitting and coupling a shaft having a magnet bonded and fixed to an outer surface to a yoke of a case; and a commutator on one side of the hub; The other side is coupled with a coil assembly in which a weight is coupled to the outer surface, and a rotor is assembled by press-fitting a bearing into the hub; and the rotor hub is press-fitted to the stator shaft; The method includes the step of closing the case with a brush assembly.

  According to the vibration motor and the manufacturing method thereof according to the present invention, the configuration is simplified and the manufacturing unit price can be reduced. In addition, since a firm coupling state is maintained, it is accurate and high vibration efficiency can be obtained. Furthermore, since the product service life is extended, high reliability of the consumer can be ensured. In addition, the process of manufacturing the motor is further simplified, and the effect of shortening the assembly process time and reducing the cost can be exhibited.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments to the extent that the present invention can be implemented will be described in detail below with reference to the accompanying drawings.

  2 is a cross-sectional view of the vibration motor according to the present invention, FIG. 3 is a cross-sectional view illustrating only the stator of the vibration motor according to the present invention, and FIG. 4 illustrates only the rotor of the vibration motor according to the present invention. It is sectional drawing shown.

  As shown in FIG. 2, the vibration motor according to the present invention has a basic configuration including a stator 40, a rotor 50, and a brush assembly 60.

  The stator 40 is fixedly installed by press-fitting a shaft 42 into the center of a yoke 44 coupled to an open end of one side of the case 41, and a magnet 43 is sandwiched between the outer surfaces of the shaft 42 and fixedly coupled. .

Here, since the magnet 43 is coupled to the outer surface of the shaft 42 whose diameter is relatively smaller than that of the existing bush 22 (see FIG. 1), the bulk can be increased on the inner side. Thereby, magnetic force generation per unit volume can be increased. Further, the stator 40 can be simplified.

  In the rotor 50, a hub 51 is rotatably sandwiched between shafts 42, a coil assembly 52 provided outside the magnet 43 of the stator 40 is coupled to one side of the hub 51, and an external supply is provided to the other side. A commutator 53 that rectifies the current is coupled.

  Here, a weight 55 is coupled to one outer surface of the coil assembly 52, and a bearing 54 for allowing the hub 51 to rotate on the shaft 42 is press-fitted into the inner peripheral surface of the hub 51.

  At this time, the hub 51 can be formed of a metal material. Preferably, when the bearing 54 is press-fitted into the interior of the resin by selecting and applying synthetic resin, the volume of the hub 51 is changed by the press-fitting of the bearing 54. Configured to be minimized.

  This is a configuration presented in consideration of the higher elasticity of the synthetic resin material than the metal material, and in the case of connecting the commutator 53 or the coil coupling body 52, the selection range of an adhesive as a coupling solvent is increased. Make it wide.

  The brush assembly 60 is electrically connected to the commutator 53. Further, the case 41 is sandwiched and joined so as to completely close the open end of the case 41. It is well known that the brush assembly 60 includes brush terminals that are in electrical contact with the commutator 53.

  FIG. 5 is a flow chart showing a manufacturing process of the vibration motor according to the present invention. Referring to FIGS. 2 and 5, the vibration motor can be obtained by simply assembling the stator 40 and the rotor 50 in independent processes, and then performing a simple operation of press-fitting the stator 40 and the rotor 50 together. Assembly is complete.

  Specifically, in order to assemble the vibration motor, a magnet 43 is bonded and fixed to the outer surface of the shaft 42 (S11), and the shaft 42 is coupled to close the open end of the case 41. The stator 40 is assembled by press-fitting onto the central axis 44 (S12).

  Here, the coupling between the shaft 42 and the yoke 44 can be performed after the yoke 44 is coupled to the case 41. Alternatively, after the magnet 43 is coupled to the shaft 42, the shaft 42 may be press-fitted into the yoke 44, and the yoke 44 may be coupled to the case 41. In either case, both processes can be easily performed. This is selectively performed according to the work situation.

  Independently, a bearing 54 is press-fitted into the hub 51 (insert injection is also possible) (S21), a commutator 53 is coupled to one side of the hub 51, and a weight 55 is coupled to the outer surface on the other side. The rotor assembly 50 is assembled by combining the coil combination body 52 (S22). Thereafter, the hub 51 (specifically, a bearing) of the rotor 50 is inserted into the shaft 42 of the stator 40. At this time, the shaft 42 of the stator 40 is relatively pressed into the hub 51 (S30).

  If the brush assembly 60 is coupled to the open end of the case 41 after performing the above process, the assembly process of the vibration motor is completed (S40).

  The present invention relates to a vibration motor, and is suitable as a vibration motor for a mobile phone or the like.

It is sectional drawing of the conventional vibration motor. It is sectional drawing of the vibration motor by this invention. It is sectional drawing which showed only the stator of the vibration motor by this invention. It is sectional drawing which showed only the rotor of the vibration motor by this invention. It is the flowchart which showed the manufacturing process of the vibration motor by this invention.

Explanation of symbols

40 Stator 41 Case 42 Shaft 43 Magnet 44 Yoke 50 Rotor 51 Hub 52 Coil Combiner 53 Commutator 54 Bearing 55 Weight 60 Brush Assembly

Claims (3)

A stator in which a shaft is fixedly installed at the center of the yoke of the case, and a magnet is sandwiched between the outer surfaces of the shaft and fixedly coupled;
A rotor in which a hub is rotatably sandwiched between the shafts, a coil combination and a commutator provided outside the stator magnet are coupled to both sides of the hub, and a weight is coupled to one outer surface of the coil combination; ;
A vibration motor having a weight mounted therein, wherein the commutator is electrically connected to the brush assembly and is coupled so as to close the open end of the case.   The interior of claim 1, wherein the hub is configured so that synthetic resin is selectively applied, a bearing is press-fitted therein, and a change in the volume of the hub due to the press-fitting of the bearing is minimized. Vibration motor equipped with a weight. Assembling a stator by press-fitting a shaft having a magnet bonded and fixed to the outer surface thereof to the yoke of the case;
Coupling a commutator on one side of the hub and a coil assembly having a weight coupled to the outer surface on the other side, and press-fitting a bearing into the hub to assemble a rotor;
A method of manufacturing a vibration motor having a weight mounted therein, the method comprising a step of press-fitting a rotor hub to the shaft of the stator and closing the case with a brush assembly.

Images