JP2009097242A - Drive of electric blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive of a low noise and low cost electric blind. <P>SOLUTION: In this drive of an electric blind, a solar radiation shielding member supportedly suspended from a head box is lifted by rotating driving a drive shaft rotatably supported in the head box by a motor through a gear box. Multiple stages of planetary gears are incorporated in the gear box 3, and the carriers 21a, 21b and the sun gears 23a, 23b of a planetary gear are formed integrally with each other by using a sintered metal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drive device that drives an electric blind up and down.

  The electric horizontal blind can move up and down the slat by rotating the slat drive shaft by the driving force of the motor and winding or unwinding the lifting cord or the lifting tape by the winding device.

  In such an electric horizontal blind, a motor is disposed in the head box, the rotation of the output shaft of the motor is decelerated by the gear box and transmitted to the drive shaft, and the slat is raised and lowered based on the rotation of the drive shaft. The The motor is a cored DC motor, and the gear box has a built-in planetary gear.

  The planetary gear includes a sun gear located in the center as an input gear, a plurality of planet gears meshed with the sun gear, a carrier that rotatably supports the planet gear, and an internal gear meshed with the planet gear around the carrier. Composed. When the sun gear is rotated, the planet gear rotates around the sun gear while meshing with the sun gear and the internal gear, and the carrier rotates with the rotation of the planet gear. By such an operation, the rotational speed of the sun gear is reduced and transmitted to the carrier.

In order to further increase the reduction ratio, a configuration is adopted in which a plurality of planetary gears are connected in series by attaching a sun gear to the carrier.
In the planetary gear, the internal gear and the carrier are formed of sintered metal obtained by sintering iron powder, and the internal gear and the motor are fixed by press-fitting a fixing pin into the mounting hole. The sun gear is fixed by press-fitting a shaft formed in the sun gear into a hole formed in the carrier.
Japanese Patent Laid-Open No. 10-314015 Japanese Utility Model Publication No. 6-30398 Japanese Patent Laid-Open No. 5-272596 Japanese Patent Laid-Open No. 60-201146

  In the electric horizontal blind as described above, the cogging torque of the cored DC motor is a source of noise and vibration. Further, the internal gear and the carrier formed of sintered metal are likely to resonate at a specific frequency, and thus may be a noise generation source. Particularly, an internal gear formed in a cylindrical shape is likely to generate noise due to resonance.

  Since the internal gear is formed of sintered metal, it is necessary to form a mounting hole for fixing to the motor in the subsequent process of the sintering process, and a dedicated jig is required to press-fit the fixing pin. .

  Further, since the carrier and the sun gear are formed as separate parts, and the work of press-fitting or press-fitting the sun gear into the carrier is required, the number of parts increases and the work man-hours also increase. In addition, when press-fitting or press-fitting the sun gear, if the press-fitting accuracy is low, the meshing between the sun gear and the planet gear and the meshing between the planet gear and the internal gear become unstable, which may cause noise and vibration. It becomes.

Patent Document 1 discloses a curtain opening / closing device using a coreless motor, but there is no disclosure regarding noise reduction of a gear that transmits the driving force of the coreless motor.
Patent Document 2 discloses a tubular electric device such as a shutter in which a planetary gear of a planetary gear is formed of a soft synthetic resin so as to reduce noise. However, there is no disclosure regarding the meshing accuracy of the planetary gears and the reduction of noise caused by the use of sintered metal.

Patent Document 3 discloses a configuration for improving the durability of the planetary gear, but similarly there is no disclosure regarding the meshing accuracy of the planetary gear and the reduction of noise caused by the use of sintered metal.
Patent Document 4 discloses a configuration that improves the meshing accuracy of the planetary gear and causes noise to occur, but there is no disclosure regarding reduction of noise caused by the use of sintered metal.

  An object of the present invention is to provide a drive device for an electric blind with low noise and low cost.

  According to the first aspect of the present invention, there is provided a driving device for an electric blind, wherein a drive shaft that is rotatably supported in the head box is rotated by a motor via a gear box, and the solar shading material supported by being suspended from the head box is moved up and down. The planetary gear is incorporated in the gear box, and the planetary gear carrier and sun gear are integrally formed of sintered metal.

In claim 2, the internal gear of the planetary gear is formed by zinc die casting.
In claim 3, the zinc die casting is ZDC3.
In claim 4, the motor is a coreless motor.

  ADVANTAGE OF THE INVENTION According to this invention, the drive device of the electric blind of low noise and low cost can be provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric horizontal blind drive device embodying the present invention will be described below with reference to the drawings.
FIG. 1 shows a drive device for an electric horizontal blind. A coreless motor 2 and a gear box 3 are disposed on one side of the head box 1. The gear box 3 is fixed to the head box 1, and the motor 2 is fixed to the gear box 3. The motor 2 is rotated forward and backward based on a control signal supplied via a cable 4 from an operation switch (not shown).

  An output shaft of the gear box 3 is connected to a drive shaft 7 via a connecting member 6. The drive shaft 7 extends in the head box 1 and is inserted into a winding pipe 9 that is rotatably supported by a support member 8 at a plurality of locations in the head box 1. The take-up pipe 9 rotates together with the drive shaft 7.

  A ladder cord support device 10 is provided at a base end portion of the winding pipe 9, and a ladder cord 11 is suspended and supported from the ladder cord support device 10. A ladder cord 11 supports a plurality of slats 12.

  An upper end portion of a lifting / lowering cord 13 is attached to the winding pipe 9, the lifting / lowering cord 13 is inserted into the slat 12, and a bottom rail (not shown) is suspended and supported at the lower end thereof. When the winding pipe 9 is rotated based on the rotation of the drive shaft 7, the lifting / lowering cord 13 is wound around the winding pipe 9 or unwound, and the slat 12 is lifted / lowered. In addition, each slat 12 is rotated through the ladder cord 11 as the winding pipe 9 rotates, and after each slat 12 is rotated to a substantially vertical direction, each ladder cord support device 10 causes each slat 12 to rotate. Further rotation of the slat 12 in the same direction is prevented.

  As shown in FIG. 2, the gear box 3 outputs the rotation of the output shaft 14 of the coreless motor 2 by decelerating the rotation with a three-stage planetary gear. The internal gear 15 constituting the planetary gear is formed in a cylindrical shape by zinc die casting (ZDC-3), and teeth constituting the internal gear 15 are engraved on the inner peripheral surface thereof. The components of zinc die casting (ZDC-3) are shown in the table below.

前記インターナルギヤ１５は、その基端部に取付孔１６が形成され、その取付孔１６に挿入されるネジ１７でブレーキハウジング１８に固定されている。ブレーキハウジング１８は、コアレスモータ２のケースに固定されている。従って、コアレスモータ２はブレーキハウジング１８を介してギヤボックス３に固定されている。

The internal gear 15 has a mounting hole 16 formed at the base end thereof, and is fixed to the brake housing 18 with a screw 17 inserted into the mounting hole 16. The brake housing 18 is fixed to the case of the coreless motor 2. Accordingly, the coreless motor 2 is fixed to the gear box 3 via the brake housing 18.

The brake housing 18 accommodates a brake device 19 that prevents the output shaft 14 from rotating when the coreless motor 2 is not operating.
The output shaft 14 of the coreless motor 2 extends into the internal gear 15, and a pinion gear 20 made of brass is fitted to the tip portion thereof. The pinion gear 20 operates as a sun gear of the first stage planetary gear, and meshes with three planet gears 22a that are rotatably supported by the carrier 21a of the first stage planetary gear. The planet gear 22 a is formed by cutting iron material and meshes with the internal gear 15.

  Therefore, when the pinion gear 20 is rotated by the operation of the coreless motor 2, each planet gear 22a rotates around the pinion gear 20, and the carrier 21a is rotated based on the rotation of the planet gear 22a.

The carrier 21a is formed of sintered metal of JISZ2550 and SMF5 type (symbol: SMF5040), and a sun gear 23a of a second stage planetary gear is integrally formed.
The planet gear 22b and carrier 21b of the second stage planetary gear are configured in the same manner as the planet gear 22a and carrier 21a of the first stage. The planet gear 22c of the third stage planetary gear is the same as the first and second stage planetary gears, but no sun gear is formed on the carrier 21c, and the base end of the output shaft 24 is not relatively rotatable. Is fitted. An intermediate portion of the output shaft 24 is rotatably supported by a bearing portion 25 formed on the internal gear 15, and a tip end of the output shaft 24 protrudes outside the internal gear 15 and is fitted to the connecting member 6. The

Accordingly, in the gear box 3, the rotation of the output shaft 14 of the coreless motor 2 is decelerated by the three-stage planetary gear and transmitted to the output shaft 24 of the gear box 3.
As shown in FIG. 3, the gear box 3 is fixed to the head box 1 via a motor bracket 26. The motor bracket 26 is formed in a cylindrical shape that covers the outer peripheral surface of the gear box 3 with a rubber material, and a pair of leg portions 27 that abut against the bottom surface of the head box 1 is formed in the lower portion thereof, and the head box 1 is formed in the upper portion thereof. An engaging portion 29 is formed to engage with the opposing surfaces of a pair of ribs 28 that protrude downward from both the front and rear sides of the upper portion.

  The motor bracket 26 is supported by the head box 1 by the bottom surface of the head box 1 and the rib 28, and the gear box 3 is supported by the head box 1 via the motor bracket 26.

  The head box 1 is opened upward, and a lid member 30 made of a rubber material is fitted over the entire length of the head box 1 in the opening. A cover slat 31 is attached to the top of the lid member 30.

  With such a configuration, the gear box 3 is supported by the head box 1 via the motor bracket 26 formed of a rubber material, and the motor bracket 26 contacts the head box 1 only at the leg portion 27 and the engaging portion 29. Yes.

  Therefore, propagation of the vibration of the gear box 3 to the head box 1 is substantially blocked. Further, since the opening of the head box 1 is covered with the lid member 30 and the cover slat 31, the leakage of noise generated by the coreless motor 2 and the gear box 3 to the outside of the head box 1 can be attenuated.

  In the electric horizontal blind configured as described above, when the coreless motor 2 is operated based on the operation of the operation switch, the rotation of the output shaft 14 of the coreless motor 2 is decelerated by the gear box 3 and the output shaft 24 of the gear box 3 is rotated. The rotation is transmitted to the drive shaft 7.

  When the drive shaft 7 is rotated in the winding direction of the lifting / lowering cord 13, the slat 12 is pulled up, and when the driving shaft 7 is rotated in the rewinding direction of the lifting / lowering cord 13, the slat 12 is lowered.

The noise generated during the raising / lowering operation or the angle adjusting operation of the slat will be described with reference to FIGS.
FIG. 5 shows a conventional example in which an internal gear is formed of sintered metal, a gear box formed by pressing and fixing a sun gear of each planetary gear into a carrier of the preceding planetary gear, and a cored motor are accommodated in the head box. The noise characteristics of the electric horizontal blind are shown. FIG. 5A shows a histogram H1 of noise in the audible frequency band, and FIG. 5B shows a numerical value of the noise level L1 at each measurement point in the audible frequency band.

  FIG. 4 shows that a gear box and a coreless motor, which are formed integrally with the carrier of the preceding planetary gear, in which the internal gear is formed by the above-described zinc die casting and the sun gear of each planetary gear is formed of sintered metal, are accommodated in the head box. The noise characteristic of the electric horizontal blind of this embodiment is shown. Noise characteristics are A characteristics. FIG. 4A shows a noise histogram H2 in the audible frequency band, and FIG. 4B shows a numerical value of the noise level L2 at each measurement point in the audible frequency band.

  In such a measurement result, as shown in the table below, in the electric horizontal blind according to the present embodiment, it is reduced by the OVERALL value in the entire audible band as compared with the conventional example, and is reduced in the entire high frequency range of 1 kHz or more. In particular, the noise level is reduced at a frequency between 1 kHz and 2 kHz, which is particularly easy for residents to feel as noise.

上記のように構成された電動横型ブラインドの駆動装置では、次に示す作用効果を得ることができる。
（１）焼結金属で形成したキャリア２１ａ，２１ｂにサンギヤ２３ａ，２３ｂを一体に形成したので、キャリアにサンギヤを圧入して固定する必要はない。従って、サンギヤとプラネットギヤ及びプラネットギヤとインターナルギヤとの噛み合い精度を向上させることができるので、ギヤボックス３で発生する騒音及び振動を低減することができる。
（２）キャリア２１ａ，２１ｂにサンギヤ２３ａ，２３ｂを一体に形成したので、キャリアにサンギヤを圧入する工程を省略することができるとともに、部品点数を削減することができる。
（３）インターナルギヤ１５を亜鉛ダイカスト（ＺＤＣ−３）で形成した。亜鉛ダイカスト（ＺＤＣ−３）は、特定の周波数で共振しにくい。従って、騒音の発生を抑制することができる。
（４）亜鉛ダイカストのインターナルギヤ１５では、成形時に取付孔１６を同時に成形することができるので、インターナルギヤ１５の形成するための工数を削減することができる。また、インターナルギヤ１５はネジ１７でコアレスモータ２に固定することができるので、固定ピンを圧入するための冶具を必要とすることはない。
（５）コアレスモータ２を使用しているので、騒音及び振動を低減することができる。
（６）表２に示すように、電動横型ブラインドを動作させたとき、居住者にとって耳障りとなる１ｋＨｚ〜２ｋＨｚの間の周波数での騒音レベルを低減することができる。

With the electric horizontal blind drive device configured as described above, the following operational effects can be obtained.
(1) Since the sun gears 23a and 23b are integrally formed on the carriers 21a and 21b formed of sintered metal, it is not necessary to press-fit and fix the sun gear to the carrier. Accordingly, since the meshing accuracy between the sun gear and the planet gear and between the planet gear and the internal gear can be improved, noise and vibration generated in the gear box 3 can be reduced.
(2) Since the sun gears 23a and 23b are formed integrally with the carriers 21a and 21b, the step of press-fitting the sun gear into the carriers can be omitted, and the number of parts can be reduced.
(3) The internal gear 15 was formed by zinc die casting (ZDC-3). Zinc die casting (ZDC-3) is unlikely to resonate at a specific frequency. Therefore, generation of noise can be suppressed.
(4) In the zinc die-cast internal gear 15, the mounting hole 16 can be formed at the same time as forming, and therefore the number of steps for forming the internal gear 15 can be reduced. Moreover, since the internal gear 15 can be fixed to the coreless motor 2 with the screw 17, a jig for press-fitting the fixing pin is not required.
(5) Since the coreless motor 2 is used, noise and vibration can be reduced.
(6) As shown in Table 2, when the electric horizontal blind is operated, it is possible to reduce the noise level at a frequency between 1 kHz and 2 kHz, which is annoying for the resident.

You may implement the said embodiment in the following aspects.
-The motor and gearbox of the said embodiment can also be used as drive devices, such as an electric roll blind, an electric pleat curtain, and an electric scooping curtain.

It is a front view which shows the drive device of an electric horizontal blind. It is sectional drawing which shows a gear box. It is sectional drawing which shows a motor bracket. (A) (b) is explanatory drawing which shows a noise characteristic. (A) (b) is explanatory drawing which shows the noise characteristic of a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Head box, 2 ... Coreless motor, 3 ... Gear box, 7 ... Drive shaft, 14, 24 ... Output shaft, 15 ... Internal gear, 21a-21c ... Carrier, 22a-22c ... Planet gear, 23a, 23b ... Sun gear.

Claims (4)

In the drive device of the electric blind which lifts and lowers the solar shading material supported by being suspended from the head box by rotating and driving the drive shaft supported rotatably in the head box with a motor via a gear box.
A drive device for an electric blind, wherein a plurality of planetary gears are built in the gear box, and the carrier and sun gear of the planetary gear are integrally formed of sintered metal.   2. The drive device for an electric blind according to claim 1, wherein an internal gear of the planetary gear is formed by zinc die casting.   The drive device for an electric blind according to claim 2, wherein the zinc die casting is ZDC3.   The drive device for an electric blind according to any one of claims 1 to 3, wherein the motor is a coreless motor.

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