JP2007315561A - Method of manufacturing dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of a manufacturing a miniaturized dynamic damper capable of reducing vibration and noise in a region of a restricted space when a motor is installed in the restricted space, and capable of facilitating the installation work. <P>SOLUTION: A sound insulation belt 36 is wound around an outer periphery of a yoke 12 of the motor, a pair of superposing margins 38 and 40 is abutted with each other, and a protrusion 42 is inserted into a through hole 46, and is fixed. Next, a small diameter part of a mass 46 is fitted to the protrusion 42, and thus, a dynamic damper 30 is completed, and installation in the motor is completed simultaneously. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dynamic damper manufacturing method for manufacturing and mounting a dynamic damper having a spring mass system for suppressing rotational vibration of a motor on a peripheral surface of a yoke portion of the motor.

  In a small actuator, in particular, a motor applied as a drive source of an electric power steering device for a vehicle, a dynamic damper is attached to reduce vibration caused by driving the motor and noise caused by the vibration. The motor for the electric power steering apparatus is required to be downsized for cost reduction and vehicle component layout.

By the way, as a prior art of the dynamic damper, as described in Patent Document 1, there is a proposal of adding a fin for heat dissipation to the function as the dynamic damper.
JP 2004-28295 A

  However, the mounting of the dynamic damper is limited in size and shape in terms of vehicle component layout, and sufficient vibration damping and noise reduction cannot be ensured. On the other hand, in order to ensure vibration suppression and quietness in a limited space, the motor itself must be redesigned, resulting in a complicated structure and increased costs. In addition, as described in Patent Document 1, adding another function to the dynamic damper in addition to the original function called a vibration damping function causes further enlargement.

  In consideration of the above facts, the present invention is small in size and can be easily attached when the motor is mounted in a limited space, and can be provided with vibration suppression and noise reduction within the space. The object is to obtain a method of manufacturing a dynamic damper.

  The present invention relates to a dynamic damper manufacturing method for manufacturing and mounting a dynamic damper having a spring mass system for suppressing rotational vibration of a motor on a peripheral surface of a yoke portion of the motor, and comprising a belt-shaped sheet metal belt The first step of forming a sound insulation band by sticking an elastic sheet on one surface, and supporting both ends in the longitudinal direction of the sound insulation band, leaving the mating margins at both ends, The mating margin is bent so as to be bent at an angle θ that is a right angle with a predetermined tolerance, and the distance between the bent portions is larger than the outer diameter of the yoke portion of the motor. In the second step, a through hole and a protrusion that fits in the through hole are formed in the pair of mating margin regions so as to be positioned coaxially when they are abutted with each other. A third insulation step, and a sound insulation band bent by the third step is inserted into the yoke portion of the motor from the direction perpendicular to the axis, wound around the circumferential surface of the yoke portion, the mating margins are butted together, And a fourth step of mounting a mass of mass based on vibration suppression by the spring mass system when the through hole and the protrusion are fitted.

  In the first step, a sound-insulating band is formed by attaching an elastic sheet to one surface of the belt-shaped sheet metal belt. In the second step, the both ends of the sound insulation band in the longitudinal direction are supported, so that the margins are left at the both ends, and the margins are folded at an angle θ that is a right angle with a predetermined tolerance. Bending is performed so that the distance between the bent portions is larger than the outer diameter of the yoke portion of the motor.

  In the third step, a through hole and a protrusion that fits into the through hole are formed in the pair of margin regions so as to be located on the same axis when they are abutted with each other. This third step may be executed before the second step and applied as a positioning reference for supporting the alignment allowance. In the fourth step, the sound-insulated band that has been bent is inserted into the yoke portion of the motor, wound around the circumferential surface of the yoke portion, the mating margins are butted together, and the through hole and the projection portion are fitted together A mass of mass based on vibration suppression by the spring mass system is mounted. This fourth step is a procedure for attaching the dynamic damper to the yoke part of the motor. The final step of this attachment procedure includes the attachment of the mass, and the production of the dynamic damper is completed by the attachment of this mass. Become.

  As described above, in the present invention, since the portion that is the basis of vibration suppression and noise is formed in a band shape, a small and efficient dynamic damper can be obtained. Further, since the interval of the alignment allowance after the bending process is made larger than the outer diameter of the yoke portion of the motor, the attaching operation becomes easy. In the present invention, the bending process is a press process.

  Since the sound insulation band is bent in an arc shape by pressing, bending can be performed without peeling the sheet metal and the elastic sheet. Furthermore, in the present invention, the sound insulation band has a single structure. Since one sound insulation band is wound around the yoke portion, the work becomes easy.

  Further, the sound insulation band is composed of a plurality of sheets, and is connected in series by fitting the through holes and projections formed at the butting margins of different sound insulation bands, around the yoke portion of the motor. It is characterized by being wound. Since the arc length of each sound insulation band is shortened, the bending process is simplified.

  Furthermore, the projection is formed by embossing to form a cylindrical shape, and the mass is attached to the cylindrical projection. Since it is only necessary to insert the mass into the cylindrical projecting portion, the attaching operation is facilitated. In addition, the through hole and the protrusion are non-circular, and prevent rotation of the mounted mass. If the protruding portion is non-circular, the mass does not rotate after being mounted on the protruding portion, so that the vibration damping property and the quietness due to the movement and deformation of the mass are not reduced.

  As described above, according to the present invention, when the motor is mounted in a limited space, it is possible to perform the mounting work easily with a small size that can provide vibration damping and quietness within the space. Has an excellent effect.

  FIG. 1 shows an electric power steering motor (EPS motor) 10 according to the present embodiment. A rotor shaft 14 projects from one end surface (right end surface in FIG. 1) of the yoke 12 that covers the components of the motor 10. The rotor shaft 14 is supported by bearings 20 provided at the left and right ends of the yoke 12 in FIG. 1, and is fitted to the rotor 22 inside the yoke 12. A stator 24 is provided inside the motor 10 and faces the outer peripheral surface of the rotor 22. A stator coil 24A is wound around the stator 24. Here, the energization control of the stator coil 24 </ b> A causes a change in the magnetic field between the stator 24 and the rotor 22, so that both rotate relative to each other (substantially, the rotor 22 rotates), and the rotor shaft 14 is rotated. This rotational driving force can be output to the outside (for example, a gear box).

  As shown in FIG. 2, a dynamic damper 30 manufactured according to the present invention is wound around the outer periphery of the yoke 12. The dynamic damper 30 includes a sound insulation band 36 in which an elastic body (rubber 34 (butyl rubber or the like)) is attached to the inner peripheral surface of a thin belt-shaped sheet metal material (sheet metal sheet) 32. The sound insulation band 36 is wound around the entire circumference of the yoke 12.

The winding ends of the sound insulation band 36 are bent outward at a substantially right angle (angle θ) to form a pair of mating margins 38 and 40. For this reason, when the sound insulation band 36 is wound over the entire circumference, the pair of mating allowances 38 and 40 are configured to face each other.
A cylindrical protrusion 42 formed by embossing is formed in one mating margin 38, 40, and a circular through hole 44 is provided in the other mating margin 40.

  The outer diameter φd1 of the protrusion 42 is smaller than the inner diameter φd2 of the through hole 44 (φd1 <φd2). As a result, when the pair of alignment margins 38 and 40 are abutted, the protrusion 42 is inserted into the through hole 44. It has become so.

  The tip of the protrusion 42 protruding from the opposite side of the through hole 44 by this insertion is crushed so that the outer diameter is enlarged by so-called caulking, and is prevented from coming off. Thereby, the sound insulation band 36 wound around the outer periphery of the yoke 12 is held in a state of being in close contact with the outer periphery of the yoke 12. Further, a mass 46 having a mass for vibration suppression obtained in advance by design is attached to the protrusion 42. The mass 46 is a stepped columnar shape in which a small diameter portion substantially coincident with the inner diameter of the projection portion 42 and a large diameter portion larger than the small diameter portion are continuous, and the small diameter portion is fitted to the projection portion 42. Yes.

  A sound insulation effect is achieved by the sheet metal material of the sound insulation band 36 configured as described above, and a vibration damping effect is achieved by the elastic body combined with the sheet metal material. In other words, by attaching the dynamic damper 30 to the motor 10, noise during driving of the motor is reduced, and vibration during driving is reduced by the elastic coefficient of the rubber 34 and the mass of the mass 46.

  The operation of this embodiment will be described below. 3 to 6 show a process of manufacturing the dynamic damper 30 attached to the motor 10, and the manufacturing procedure of the dynamic damper 30 will be described with reference to FIGS. 3 corresponds to the first step of the present invention, FIG. 4 corresponds to the second step of the present invention, FIG. 5 corresponds to the third step of the present invention, and FIG. 6 corresponds to the fourth step of the present invention.

  First, as shown in FIG. 3A, a rubber sheet 48 is attached to a predetermined position of a rectangular sheet metal sheet 47. After pasting, as shown in FIG. 3 (B), it is cut along the chain line arrow in FIG. 3 (B) to a width suitable for winding of the motor 10 (sound insulation band 36 is completed). FIG. 4A shows a state in which the sound insulation band 36 formed by cutting is hung on the support surfaces 52 at both ends of the bending jig 50. An intermediate portion of the bending jig 50 is a concave portion 54 bent in an arc shape. In this state, the chuck 56 disposed opposite to the support surface 52 is lowered to sandwich the mating margins 38 and 40 formed at both ends of the sound insulation band 36 (see thick arrows in FIG. 4A). .

  On the other hand, a bending head 58 stands by at the upper part facing the concave portion 54 located at the intermediate portion of the bending jig 50, and the bending head 58 is lowered. Along with this descent, the sound insulation band 36 is gradually bent into an arc as shown in FIG. Here, as shown in FIG. 4 (A), the width dimension L of the recess 54 is larger than the outer diameter φD of the yoke 12, and the distance between the mating margins 38 and 40 after bending is as follows. It becomes larger than the outer diameter φD of the yoke 12. Thereby, when winding around the yoke 12, it is possible to insert the sound insulation belt 36 from the direction perpendicular to the axis with respect to the yoke 12.

  Next, FIG. 5A shows a state in which the protruding portion 42 is formed on one mating allowance 38. Since the protrusion 42 is formed by embossing, it is formed integrally with the mating allowance 38. At this time, the outer diameter of the protrusion 42 is φd1. FIG. 5B shows a state where a circular through hole 44 is formed in the other mating allowance 40. The through hole 44 is formed by drilling with a drill or the like, and its inner diameter is φd2. Here, the outer diameter φd1 of the protrusion 42 formed in the one mating margin 38 is smaller than the inner diameter φd2 of the through hole 44 formed in the other mating margin 40 (φd1 <φd2).

  Next, as shown in FIG. 6A, the portion of the sound insulation belt 36 of the dynamic damper 30 is wound around the outer periphery of the yoke 12 (see the chain line arrow in FIG. 6A). At this time, since the distance between the pair of allowances 38 and 40 is larger than the outer diameter of the yoke 12 as described above, the longitudinal intermediate portion of the sound insulation band 36 is first pressed against the outer periphery of the yoke 12 so Winding work can be performed. When the plating is completed, the pair of mating margins 38 and 40 are abutted, and at this time, the protrusion 42 is inserted into the through hole 44.

  As shown in FIG. 6 (B), the tip of the protrusion 42 that protrudes from the opposite side by insertion into the through hole 44 is crushed by so-called caulking, the outer diameter is increased, and the retaining is performed. Thereby, the sound insulation band 36 is held in a state of being wound around the outer periphery of the yoke 12. Finally, as shown in FIG. 6C, the small diameter portion of the mass 46 is fitted to the protrusion 42, whereby the manufacture of the dynamic damper 30 is completed, and the attachment to the motor 10 is completed at the same time.

  As described above, in the present embodiment, the dynamic damper 30 can be mounted in a small space around the motor 10 even if the size and shape of the vehicle are limited in terms of the layout of the vehicle. , Quietness can be ensured. In addition, the structure is simple, the number of parts is small, and the manufacture is easy, leading to cost reduction.

  In this embodiment, when cutting with the rubber sheet 48 attached to the sheet metal sheet 47, the sheet is cut by pressing from the surface of the sheet metal sheet 47 to which the rubber sheet 48 is not attached so as not to generate burrs. It is preferable to do. In addition, when it is difficult to cut the rubber sheet 48 after bonding, the rubber sheet 48 may be bonded separately after being cut into a belt shape.

  Further, the process of forming the protrusions 42 and the through holes 44 is performed after the bending process, but the protrusions 42 and the through holes 44 are formed prior to the bending process, and positioning is performed when the chuck 56 is held. Good. Further, although the sound insulation band 36 is positioned on the bending jig 50 and bent by the bending head 58, it may be applied to a processing method in which pressure is applied so as to be wound around a cylindrical jig.

  Further, when there is a possibility that the mass 46 to be attached last interferes with surrounding parts, the mass 46 may be folded back inward as a flat structure. Moreover, the small diameter part provided in the mass 46 can be used as a detent after fitting by making it into a polygon instead of a circle.

It is side surface sectional drawing of the EPS motor which concerns on this Embodiment. It is a left view of FIG. It is a perspective view which shows the bonding process of the sheet-metal sheet | seat and rubber | gum in the manufacturing process of a dynamic damper. It is a front view which shows the bending process of the sound-insulation belt by the bending jig in the manufacturing process of a dynamic damper. It is sectional drawing which shows the formation process of the projection part and through-hole to the alignment allowance in the manufacturing process of a dynamic damper. (A) is a front view showing the bending operation to the yoke in the manufacturing process of the dynamic damper, (B) is a cross-sectional view showing the caulking process after the sound insulation belt bending operation in the manufacturing process of the dynamic damper, and (C) is the dynamic damper. It is sectional drawing which shows the fitting operation | work of the mass in the manufacturing process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motor 12 Yoke 14 Rotor shaft 20 Bearing 22 Rotor 24 Stator 24A Stator coil 30 Dynamic damper 32 Sheet metal material 34 Rubber 36 Sound insulation band 38, 40 Alignment allowance 42 Projection part 44 Through hole 46 Mass 47 Sheet metal sheet 48 Rubber sheet 50 Bending jig 52 Support surface 56 Chuck 54 Recess 58 Bending head

Claims (6)

A dynamic damper manufacturing method for manufacturing and attaching a dynamic damper having a spring mass system for suppressing rotational vibration of the motor on the circumferential surface of the yoke portion of the motor,
A first step of forming a sound insulation band by attaching an elastic sheet to one surface of a belt-shaped sheet metal belt;
By supporting the both ends of the sound insulation band in the longitudinal direction, the margin of allowance is left at the both ends, and the margin of allowance is bent at an angle θ that is a right angle with a predetermined tolerance, and A second step of bending so that an interval between the bent portions is larger than an outer diameter of the yoke portion of the motor;
A third step of forming a through hole and a protrusion fitted into the through hole so as to be positioned coaxially in the pair of mating margin regions, respectively,
The sound insulation band bent by the third step is inserted into the yoke portion of the motor, wound around the peripheral surface of the yoke portion, the mating margins are butted together, and the through hole and the projection portion are fitted together A fourth step of mounting a mass of mass based on vibration suppression by the spring mass system;
A method of manufacturing a dynamic damper.   The method for manufacturing a dynamic damper according to claim 1, wherein the bending process is a press process.   3. The method of a dynamic damper according to claim 1, wherein the sound insulation band is a single piece.   The sound insulation band is composed of a plurality of sheets, and is connected in series by fitting the through holes and projections formed at the butting margins of different sound insulation bands, and is wound around the yoke portion of the motor. The method for manufacturing a dynamic damper according to claim 1 or 2, wherein:   5. The projection according to claim 1, wherein the projection is formed by embossing to form a cylinder, and the mass is attached to the cylindrical projection. 6. Dynamic damper manufacturing method. 6. The method of manufacturing a dynamic damper according to claim 5, wherein the through hole and the protrusion are non-circular and prevent rotation of the mounted mass.

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