JP2005086840A - Vibrating motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrating motor in which the attachment and detachment of an eccentric weight are facilitated. <P>SOLUTION: The vibrating motor includes the eccentric weight 3 attached to a motor stem 1a which projects in a long length from a small-sized motor body 1 via a weight carrying plate 2. The weight carrying plate 2, molded into an inverted U shape, has a receiving plate 2a which places the eccentric weight 3, and a pair of spring hanging plates 2b, 2b which are bent in an enlarged state from both ends of this receiving plate 2a and which have a through hole H for passing the motor shaft 1a at a distal end side. This eccentric weight 3 has a semicircular sectional bearing groove 3a for receiving the motor shaft 1a along its lengthwise direction, and a positioning groove 3b extended in parallel with the opposite side peripheral surface to the bearing groove 3a as an engaging part engaged with the receiving plate 2a. A rotation inhibiting means for inhibiting the rotation of the weight carrying plate 2 to the motor shaft 1a has a D-shaped section S, and through holes H, H formed at the motor shaft 1a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration motor having an eccentric weight attached to a motor shaft, and more particularly to a vibration motor in which an eccentric weight can be easily attached and detached.

  Conventionally, in a vibration motor, a method of attaching an eccentric weight to a motor shaft is performed by using a tool or the like to insert pinching protrusions projecting on both sides of the bearing groove after the motor shaft is placed in the bearing groove formed on the eccentric weight. The motor shaft is caulked and fixed by plastic deformation to the side.

  However, in the above caulking and fixing method, the pinching piece formed integrally with the eccentric weight is plastically deformed. Therefore, in the used vibration motor, it takes time to remove the eccentric weight, It is difficult to use.

  Therefore, in view of the above problems, an object of the present invention is to provide a vibration motor in which an eccentric weight can be easily attached and detached.

  In order to solve the above problems, the present invention provides a vibration motor in which an eccentric weight is attached to a motor shaft with a weight carrying plate, the weight carrying plate including a receiving plate portion on which the eccentric weight is placed, and the receiving plate. And a pair of spring-like suspension plates having a through hole for passing the motor shaft on the tip side, and the eccentric weight has the motor shaft along its length direction. A bearing groove that extends in parallel on the opposite side of the bearing groove, and an engaging portion that engages with the receiving plate portion, and includes a detent means for preventing the weight carrying plate from rotating with respect to the motor shaft. .

  When attaching the eccentric weight to the motor shaft, the engaging portion of the eccentric weight is engaged with the receiving plate portion of the weight carrying plate, and the pair of spring suspension plate portions of the weight carrying plate is sandwiched between fingers or tools. When the spring suspension plate portion is released after passing the motor shaft through each through hole, the pair of suspension plate portions expands and returns due to the restoring force, so that the weight carrying plate stops on the motor shaft. While the motor is rotating, the rotation prevention means stops the weight carrying plate with respect to the motor shaft, and the receiving plate portion receives the eccentric weight due to the centrifugal force. Therefore, the weight carrying plate and the eccentric weight rotate together with the motor shaft. There is no backlash. When removing the eccentric weight, it is possible to realize mutual disassembly of the eccentric weight, the weight carrying plate, and the motor body simply by sandwiching and holding a pair of spring-like suspension plates and removing the through hole from the motor shaft.

  As a means for preventing rotation, for example, a friction material such as rubber may be bonded to the bearing groove so that the friction material exhibits an anti-slip action with the motor shaft. It is formed corresponding to each through hole, and can be a modified cross-sectional portion for preventing the through hole from rotating. As this irregular cross section, a D cross section is desirable.

  However, since it is necessary to position two through-holes in two irregular cross sections, the motor shaft is formed with one irregular cross-section that holds the two through holes at both end steps. Is good. It is desirable that the deformed cross section is also a D-shaped cross section. After passing the two through holes in the motor shaft at once, just releasing the pair of suspension plates, the pair of suspension plates are separated from each other by the elastic restoring force of the suspension plates, and the holes are formed in the steps on both ends. Since the peripheral edge of each of them naturally contacts, positioning becomes easy.

  As the hole contour of the through-hole, in order to increase the retaining force on the D-shaped cross section, it is preferable that the front end side of the suspension plate portion is a linear contour and the opposite side is a horseshoe contour. Since the vicinity of the upper straight contour collides with the step surface, the retaining force is increased.

  The engaging portion may be a protrusion, and a slit in which the receiving plate portion fits may be provided. However, since the strength of the receiving plate portion is reduced, the engaging portion is a groove in which the receiving plate portion is fitted. Is desirable.

  Since the present invention has an attachment structure in which a weight carrying plate for holding an eccentric weight is suspended from a motor shaft through its through hole, a vibration motor in which the eccentric weight can be easily attached and detached can be realized.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 is a perspective view showing a vibration motor according to an embodiment of the present invention, FIG. 2 is an assembled perspective view thereof, FIG. 3A is a partial sectional front view showing an attachment structure of the vibration motor, and FIG. A right side view and (c) are sectional views showing a state cut along the line AA 'in (a).

  The vibration motor of this example is formed by attaching an eccentric weight 3 to a motor shaft 1a that protrudes long from a small motor body 1 by means of a weight carrier plate 2.

  The weight carrier plate 2 has a pair of spring properties including a receiving plate portion 2a on which the eccentric weight 3 is placed, and a through hole H that is bent from both ends of the receiving plate portion 2a so as to pass through the motor shaft 1a. It has suspension plate portions 2b and 2b and is formed in a U-shape.

  The eccentric weight 3 has a substantially semi-cylindrical shape obtained by sintering a high specific gravity metal such as tungsten. The eccentric weight 3 has a semicircular bearing groove 3a for receiving the motor shaft 1a along its length direction, and the bearing groove 3a. Has a positioning groove 3b as an engaging portion into which the receiving plate portion 2a fits, extending in parallel on the opposite peripheral surface. The anti-rotation means for preventing rotation of the weight carrier plate 2 with respect to the motor shaft 1a comprises a D-shaped cross-section S formed in the motor shaft 1a and through holes H, H, and the hole contour of each through hole H is a suspension plate. The tip side of the portion 2b has a straight contour and the opposite side has a horseshoe contour.

  When the eccentric weight 3 is attached to the motor shaft 1a in the vibration motor having such an attachment structure, the positioning groove 3b of the eccentric weight 3 is engaged with the receiving plate portion 2a of the weight carrier plate 2, and the weight carrier plate. After holding the pair of spring suspension plates 2b with fingers or a tool and passing the motor shaft 1a through each through hole H and then releasing the spring suspension plates 2b, the pair of suspension suspension plates 2b is restored by its restoring force. Since the plate portion 2b expands and returns, the peripheral edge of the through hole H stops on both end steps of the D-shaped cross-section S of the motor shaft 1a. While the motor is rotating, the rotation preventing means is the D-shaped cross section S and the through holes H, H, and the receiving plate portion 2a receives the eccentric weight 3 due to the centrifugal force. Rotates together with the motor shaft 1a, and the eccentric weight 3 is not loose. When the eccentric weight 3 is removed, the eccentric weight 3, the weight carrier plate 2 and the motor main body 1 are mutually disassembled by simply holding the pair of spring suspension plates 2b and removing the through hole H from the motor shaft 1a. Can be realized.

  In particular, in this example, the motor shaft 1a is formed with a D-shaped cross-section S, which is one odd-shaped cross-section that engages the two through-holes H, H with steps at both ends. After passing H at a stroke, the pair of suspension plate portions 2b are separated from each other by the elastic restoring force of the suspension plate portion 2b only by releasing the pair of suspension plate portions 2b. Since the peripheral edges of the through holes H and H naturally come into contact with each other, positioning becomes easy. Further, as the hole contour of the through hole H, in order to increase the retaining force on the D-shaped cross section S, the tip side of the suspension plate 2b is a straight contour and the opposite side is a horseshoe contour. The vicinity of the straight outline collides with the step surface, and the retaining force is increased.

It is a perspective view which shows the vibration motor which concerns on the Example of this invention. It is an assembly perspective view of the vibration motor (A) is a partial cross-sectional front view showing an attachment structure in a vibration motor, (b) is a right side view thereof, and (c) is a cross-sectional view showing a state cut along line AA ′ in (a). It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Small motor main body 1a ... Motor shaft 2 ... Weight support plate 2a ... Supporting plate part 2b ... Suspension plate part 3 ... Eccentric weight 3a ... Bearing groove 3b ... Positioning groove H ... Through-hole S ... D-shaped cross section

Claims (7)

A vibration motor in which an eccentric weight is attached to a motor shaft with a weight carrying plate, the weight carrying plate being bent in an open shape from a receiving plate portion on which the eccentric weight is placed and both ends of the receiving plate portion And a pair of spring suspension plates having a through-hole through which the motor shaft passes, and the eccentric weight has a bearing groove for receiving the motor shaft along its length direction. An engaging portion that extends in parallel on the opposite side of the bearing groove, engages with the receiving plate portion, and includes an anti-rotation means that prevents the rotation of the weight carrying plate with respect to the motor shaft. And vibration motor. 2. The vibration motor according to claim 1, wherein the rotation preventing means is a deformed cross-sectional portion that is formed in the motor shaft so as to correspond to each through hole and prevents the through hole from rotating. 3. The vibration motor according to claim 2, wherein the odd-shaped cross section is a D-shaped cross section. 2. The vibration motor according to claim 1, wherein the anti-rotation means is a deformed cross section formed on the motor shaft and engaging the two through holes with steps at both ends. 5. The vibration motor according to claim 4, wherein the odd-shaped cross section is a D-shaped cross section. 6. The vibration motor according to claim 3, wherein the hole contour of the through hole is a straight contour on the tip side of the suspension plate portion and a horseshoe contour on the opposite side. 7. The vibration motor according to claim 1, wherein the engaging portion is a groove into which the receiving plate portion is fitted.

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