JP2009303444A - Flat motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat motor capable of markedly reducing the sliding loss between a sliding bearing and a washer. <P>SOLUTION: The flat vibration motor is provided with a stator 10 having a stator plate 11, in which one end is inserted into an attaching hole 11a and a supporting shaft 13 is upright and fixed; a rotor 20 rotatably supported for the supporting shaft 13 via the sliding bearing 21; the flat motor has a first washer 12 fitted to the supporting shaft 13 between the stator plate 11 and the rotor 20, and a second washer 18 fitted to the supporting shaft 13 by gap fitting between the first washer 12 and the rotor 20; and the first washer 12 has a lubricant-reserving chamber S between itself and the second washer 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flat motor configured using a brushless motor or the like.

A flat vibration motor disclosed in Japanese Patent Application Laid-Open No. 9-1331020 includes a stator having a stator plate in which one end is inserted into a mounting hole and a support shaft is fixed upright, and a rotor that is rotatably supported by a support shaft via a slide bearing. In order to reduce the sliding loss between the slide bearing and the support shaft, it is necessary to regulate the displacement in the thrust direction with respect to the rotor support shaft as a clearance of the fit tolerance between the slide bearing and the support shaft is provided. Thus, a thrust washer as a spacer is freely fitted on the support shaft between the stator plate and the slide bearing.
Japanese Patent Laid-Open No. 9-13310 (FIG. 1)

  During rotation of the rotor, one surface of the thrust washer receives one end surface of the rotating slide bearing and the other surface is in contact with the fixed stator plate. Not only that, there is a strong sliding loss with the washer.

  Therefore, in view of the above problems, an object of the present invention is to provide a flat motor that can significantly reduce the sliding loss between the sliding bearing and the washer.

  The present invention relates to a flat motor having a stator having a stator plate in which one end is inserted into an attachment hole and the support shaft is fixed upright, and a rotor that is rotatably supported with respect to the support shaft via a slide bearing. And a first washer fitted on the spindle between the rotor and the rotor, and a second washer fitted with a gap fit on the spindle between the first washer and the rotor. The first washer It has the lubricating oil storage chamber between.

  The second washer rotates on the first washer in contact with the rotor, and the lubricating oil from the lubricating oil storage chamber of the first washer is caused by the sliding contact surface between the first washer and the second washer and the second washer. Since it is continuously supplied to the sliding contact surface between the rotor and the rotor, the sliding loss can be greatly reduced, and it can be maintained for a long time.

  Here, as the first washer, a lubricating oil storage chamber is defined by projecting toward the rotor side outside the first annular plate portion having the first shaft hole through which the support shaft is inserted and on the outer peripheral side of the first annular plate portion. And an outer peripheral wall portion. The internal volume of the lubricating oil storage chamber can be increased, the amount of storage can be secured, and even if the first washer is driven to rotate, centrifugal scattering of the lubricating oil can be suppressed at the outer peripheral wall portion. In this case, the second washer may have a second annular plate portion that has a second shaft hole through which the support shaft is inserted and that is loosely fitted in the lubricating oil reservoir and receives the surface on the rotation center side of the rotor.

  In addition to the configuration of the first washer described above, an inner peripheral wall portion having an extended first shaft hole and projecting toward the rotor side on the inner peripheral side of the first annular plate portion to define a lubricating oil storage chamber of the annular groove When it has integrally, the oil leak and dissipation via the 1st axial hole of a 1st washer can be suppressed. In this case, the second washer may have a second annular plate portion that has a second shaft hole through which the support shaft is inserted and that is loosely fitted in the lubricating oil reservoir and receives the surface on the rotation center side of the rotor.

  Further, the second washer has a second annular plate portion that has a second shaft hole through which the support shaft is inserted and has a second annular plate portion that covers the lubricating oil storage chamber from the inner peripheral wall portion to the outer peripheral wall portion and receives the surface on the rotation center side of the rotor But it ’s okay. Since the second annular plate portion functions as a cover plate for the lubricating oil storage chamber of the first washer, excessive leakage and scattering of the lubricating oil can be suppressed, and the life can be extended.

  The flat vibration motor can be used as a flat vibration motor by providing an eccentric weight on the rotor plate.

  According to the flat motor according to the present invention, since the first washer has the lubricating oil reservoir between the second washer, the sliding loss between the slide bearing and the washer can be greatly reduced.

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

  FIG. 1 is a cross-sectional view showing the right half of the flat vibration motor according to the first embodiment of the present invention.

  The flat (coin-shaped) vibration motor of this example is a brushless motor including a stator 10 and a rotor 20. The stator 10 includes a metal (magnetic material) circular stator plate (base plate or bottom plate) 11, a support shaft (fixed shaft) 13 which is welded by fitting one end into an attachment hole 11 a of the stator plate 11, and the support shaft 13. A first washer 12 made of resin that fits loosely on the stator plate 11, a second washer 18 made of resin that fits on the support shaft 13 and fits on the first washer 12, and the stator plate 11 A power supply flexible board 30 superimposed on the upper surface, a switching integrated circuit (not shown) and a capacitor (not shown) including a rotational position detecting Hall element mounted on the flexible board 30, and a power supply A plurality of flat air core coils 16 for driving disposed on the flexible substrate 30 and the stator plate 11 are fitted, and the other end of the support shaft 13 is fitted into the mounting hole 17a and welded. Having a metallic shallow cup-shaped casing 17.

  The rotor 20 is rotatably supported by the support shaft 13 via the plain bearing 21 of the bearing holder portion 23a, and a rotor plate 23 having an annular permanent magnet 22 facing the flat air core coil 16 on the lower side, And an arc-shaped eccentric weight 24 provided on the outer peripheral side of the rotor plate 23.

The first washer 12 is outside of the first annular plate portion 12a having a first shaft hole h ₁ of the support shaft 13 is inserted, the lubricant reservoir projecting into the rotor 20 side in the outer peripheral side of the first annular plate part 12a The outer peripheral wall part 12b which defines S is integrated. The second washer 18 is a second annular plate portion that has a second shaft hole h ₂ through which the support shaft 13 is loosely inserted and is loosely fitted in the lubricating oil storage chamber S to receive one end surface of the slide bearing 21.

  The second washer 18 rotates on the first annular plate portion 12a of the first washer 12 in contact with one end face of the sliding bearing 21. However, the lubricating oil from the lubricating oil storage chamber S of the first washer 12 is rotated. Since it is continuously supplied to the sliding contact surface between the first washer 12 and the second washer 18 and the sliding contact surface between the second washer 18 and the slide bearing 21, the sliding loss can be greatly reduced and it can be maintained for a long time. In particular, the lubricating oil storage chamber S is provided in the first washer 12 which is relatively difficult to rotate, and the amount of storage can be secured, and the second washer can be rotated in the second washer. Oil supply to the sliding contact surface between 18 and the sliding bearing 21 is smooth. And even if a 1st washer carries out a rotation rotation, the centrifugal scattering of lubricating oil can be suppressed by the outer peripheral wall part 12b.

FIG. 2 is a cross-sectional view showing a state in which the case is removed from the flat vibration motor according to the second embodiment of the present invention. 2 that are the same as those shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

This example is different from the first embodiment in the configuration of the first washer 12 'and the second washer 18'. That is, the first washer 12 'has extended the first shaft hole h _1, the lubricating oil storage chamber S of the annular groove and protrudes into sliding bearing 21 side in the inner peripheral side of the first annular plate part 12a' picture of The inner peripheral wall portion 12c is integrally formed. 'The second shaft hole of H ₂ first washer 12' second washer 18 larger than the outer diameter of the inner circumferential wall 12c of the second washer 18 'lubricating oil storage chamber S of the annular groove' loosely fitted into the ing.

In this example, the first washer 12 'has an inner peripheral wall portion 12c, possible to prevent the lubricating oil from leaking along the first shaft hole h _1.

FIG. 3 is a cross-sectional view showing a state in which the case is removed from the flat vibration motor according to the third embodiment of the present invention. 3, the same parts as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.

In Example 2 differs from the embodiment, "in the configuration of a. That is, the second washer 18" second washer 18 from the outer periphery and the second inside have axial hole h ₂ peripheral wall 12c which support shaft 13 is loosely inserted A second annular plate portion that receives the one end surface of the slide bearing 21 covers the lubricating oil storage chamber S ″ of the annular groove across the wall portion 12b.

  Since the second washer 18 "functions as a cover plate for the lubricating oil storage chamber S", excessive leakage and scattering of the lubricating oil can be suppressed, and the life can be extended.

  In addition, the washer structure of this example is applicable not only to a flat brushless motor but also to a flat brushed motor.

It is sectional drawing which shows the right half toward the flat vibration motor which concerns on Example 1 of this invention. It is sectional drawing which shows the state which removed the case in the flat vibration motor which concerns on Example 2 of this invention. It is sectional drawing which shows the state which removed the case in the flat vibration motor which concerns on Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stator 11 ... Stator plate 11a, 17a ... Mounting hole 12, 12 '... 1st washer 12a ... 1st annular plate part 12b ... Outer peripheral wall part 12c ... Inner peripheral wall part 13 ... Support shaft 16 ... Flat air core coil 17 ... case 18, 18 ', 18 "... second washer 20 ... rotor 21 ... sliding bearings 22 ... annular permanent magnet 23 ... rotor plate 23a ... bearing holder 24 ... eccentric weights 30 ... flexible substrate _{h 1} ... first shaft hole for feeding h ₂ , H ₂ ... second shaft holes S, S ', S "... lubricant storage chamber

Claims (7)

In a flat motor comprising a stator having a stator plate in which one end is inserted into an attachment hole and the support shaft is fixed upright, and a rotor that is rotatably supported via a slide bearing with respect to the support shaft.
A first washer fitted on the support shaft between the stator plate and the rotor, and a second washer fitted with a clearance fit on the support shaft between the first washer and the rotor. A flat motor, wherein the first washer has a lubricating oil storage chamber between the first washer and the second washer. 2. The flat motor according to claim 1, wherein the first washer includes a first annular plate portion having a first shaft hole through which the support shaft is inserted, and an outer peripheral side of the first annular plate portion on the rotor side. A flat motor characterized by integrally including an outer peripheral wall portion that protrudes and defines the lubricating oil storage chamber. 3. The flat motor according to claim 2, wherein the second washer has a second shaft hole through which the support shaft is inserted, and is loosely fitted in the lubricating oil storage chamber to receive a surface on the rotation center side of the rotor. A flat motor having two annular plate portions. 3. The flat motor according to claim 2, wherein the first washer extends the first shaft hole, protrudes toward the rotor on the inner peripheral side of the first annular plate portion, and lubricates the annular groove. A flat motor characterized by integrally having an inner peripheral wall portion defining an oil storage chamber. 5. The flat motor according to claim 4, wherein the second washer has a second shaft hole through which the support shaft is inserted, and is loosely fitted in the lubricating oil storage chamber to receive a rotation center side surface of the rotor. A flat motor having a plate portion. 5. The flat motor according to claim 4, wherein the second washer has a second shaft hole through which the support shaft is inserted, covers the lubricating oil storage chamber from the inner peripheral wall portion to the outer peripheral wall portion, and faces the rotor. A flat motor having a second annular plate portion for receiving the motor. 7. The flat motor according to claim 1, wherein an eccentric weight is provided on the rotor plate.

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