WO1995005699A1 - Dispositif d'etancheite d'arbre pour moteur electrique - Google Patents

Dispositif d'etancheite d'arbre pour moteur electrique Download PDF

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Publication number
WO1995005699A1
WO1995005699A1 PCT/JP1994/001343 JP9401343W WO9505699A1 WO 1995005699 A1 WO1995005699 A1 WO 1995005699A1 JP 9401343 W JP9401343 W JP 9401343W WO 9505699 A1 WO9505699 A1 WO 9505699A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
rim
electric motor
sealing device
stationary
Prior art date
Application number
PCT/JP1994/001343
Other languages
English (en)
Japanese (ja)
Inventor
Kosei Nakamura
Yukio Katsuzawa
Yasuyuki Nakazawa
Original Assignee
Kosei Nakamura
Yukio Katsuzawa
Yasuyuki Nakazawa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kosei Nakamura, Yukio Katsuzawa, Yasuyuki Nakazawa filed Critical Kosei Nakamura
Publication of WO1995005699A1 publication Critical patent/WO1995005699A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings

Definitions

  • the present invention relates to an electric motor (hereinafter, simply referred to as a motor) generally used as a drive motor of a machine tool or the like, and in particular, to an axis for protecting the inside of the body from moisture and dust outside the body of the motor.
  • the sealing function is a contact-type sealing function in the low-speed range of the motor, and a non-contact labyrinth-type sealing function in the high-speed range, so that it covers a wide range from the low-speed rotation range to the high-speed rotation range.
  • the present invention relates to a shaft sealing device for a motor having a composite shaft sealing function capable of exerting a uniform sealing function across the entire shaft.
  • the closest to the rotary bearing in the stator housing is recessed on the outer part of the metal frame, and the synthetic rubber material such as acrylic rubber, double rubber, fluorine rubber, etc. is sintered into the metal frame and fixed into the seal holding part.
  • the structure was adopted to prevent foreign matter and contamination source liquid from entering from outside by fitting the oil seal to the surface and keeping the oil seal in contact with the surface of the rotating output shaft.
  • the motor when the motor is used in the so-called high-speed rotation range, the motor rotates and non-rotates at the output shaft carrying the rotor at the center and the position immediately adjacent to the rotation bearing of the stay housing, respectively.
  • it is effective to use a structure that prevents foreign matter and contamination source liquid from entering from outside during the rotation of the motor in the same labyrinth region.
  • an object of the present invention is to provide an electric motor capable of reliably and uniformly generating a shaft sealing function particularly in a wide motor rotation range from a low-speed rotation range to a high-speed rotation range.
  • the company does not provide a shaft sealing device.
  • Another object of the present invention is to provide an electric motor capable of exhibiting a proper shaft sealing function from a high-speed rotation range to a low-speed rotation range and a stationary range of a motor while having a relatively small and compact structure.
  • An object of the present invention is to provide a shaft sealing device for a motor.
  • the present invention provides a contact seal at a low speed of a motor.
  • stop means and non-contact labyrinth-type sealing means in the high-speed range, a uniform sealing action can be achieved over the entire stationary and low-to-high-speed rotation range of the motor.
  • a sealing unit having a multiple sealing function is formed while being formed as a single unit that exerts its function, and this is provided in the shaft end region of the output shaft of the motor. is there.
  • Lapince forming means formed by a rotating rim provided in a shaft end region of the output shaft and a stationary rim provided at an end of the stay housing opposed to the rotating rim;
  • the weight means comprises a mass body embedded in the sealing means molded from the synthetic rubber material, and the mass body is a metal or resin material.
  • the tongue-shaped seal portion of the sealing means comes into contact with the stationary rim of the labyrinth forming means to cut off communication between the outside of the motor and the inside of the motor.
  • the tongue of the sealing means is separated from the stationary rim by centrifugal action and formed by the rotating rim and the stationary rim while preventing wear and heat generation.
  • the labyrinth makes it possible to prevent foreign substances and liquids of pollution source from entering the motor from outside the motor.
  • FIG. 1 is a partial cross-sectional view illustrating a shaft sealing function in a low-speed rotation state of an electric motor including a shaft sealing device according to the present invention
  • Fig. 2 is a partial cross-sectional view illustrating the shaft sealing function of the electric motor in a high-speed rotation state.
  • Fig. 3 is an enlarged view of part A in Fig. 1,
  • Fig. 4 is an enlarged view of part B in Fig. 2,
  • FIG.5A is a partial cross-sectional view showing another embodiment of the shaft sealing device according to the present invention.
  • FIG. 5B is a cross-sectional view taken along arrow 5B—5B in FIG. 5A.
  • FIG. 6 is a diagram showing the characteristics of the shaft sealing device for an electric motor according to the present invention.
  • FIGS. 1 and 2 there is shown a cross-sectional view of a front half of an electric motor 10.
  • the motor 10 has a cylindrical stator housing a stator winding 12.
  • the bearing 14 has a bearing 14 and an end 14 of the housing 14, and the rotating bearing 16 (the front end of the front-rear pair) is seated on the bearing holder 14 a at the end of the housing 14.
  • An output shaft 20 having a rotor 18 at the center is provided rotatably via a bearing.
  • the shaft sealing device 30 includes the outer region of the bearing holding portion 14 a in the end region of the housing 14, and the shaft of the output shaft 20 opposed thereto. It is provided in the end region 20a.
  • the coaxial sealing device 30 has a stationary rim 32 provided substantially integrally with the bearing holding portion 14a of the stator housing 14 as a stationary element.
  • the stationary rim 32 has a disk portion 32a extending in the circumferential direction with respect to the rotation axis of the output shaft 20 and a cylindrical portion 32b extending in the radial direction with respect to the rotation axis of the output shaft 20.
  • the cylindrical portion 32b has an annular outer surface with the outer peripheral surface of the shaft end region 20a of the output shaft 20. It is opposed to the inner end via an annular minute gap.
  • a rotating rim 34 formed substantially integrally is provided in the shaft end region 20a of the output shaft 20.
  • the rotating rim 34 is a disk portion 3 2 of the stationary rim 32. It is composed of an L-shaped member having a radial disk portion 34a substantially parallel to a and an annular portion 34b protruding in the axial direction from the outer peripheral area of the radial disk portion 34a.
  • the outer peripheral surface of the part 34 b has an annular cylindrical minute gap between the outer peripheral surface of the stay housing 14 and the inner peripheral surface of the tip of the housing 14, and one part of the disk part 3 2 a of the stationary rim 32.
  • An annular disk-shaped minute gap is formed at the part facing the part.
  • the stationary rim 3 2 and the rotating rim 3 described above 4 forms the above-mentioned four small gaps around the shaft end of the output shaft 20, thereby forming a labyrinth, and the rotation speed of the output shaft 20 of the motor 10 reaches a high speed.
  • an inner chamber (seal chamber) 36 surrounded by the stationary rim 32 and the rotating rim 34 of the shaft sealing device 30 described above has the same composition as a conventionally known oil seal element.
  • a seal member 38 made of a rubber material is fixed.
  • the seal member 38 has an annular base 38a and a tongue 38b, and is fixed to the annular portion 34b of the rotary rim 34 by the base 38a.
  • the tongue-shaped portion 38b is directed toward the outer peripheral surface of the cylindrical portion 32b of the stationary rim 32 so as to form a substantially V shape from one end of the base 38a. It hangs down in a cantilever manner and is provided so that it can contact the outer peripheral surface.
  • the tongue-shaped portion 38b of the sealing member 38 elastically engages with the cylindrical portion 32b of the stationary rim 32 when the motor 10 rotates at a low speed.
  • the outside of the motor unit and the inside of the motor unit are isolated and sealed in the internal chamber 36 by contacting the outer peripheral surface.
  • the tongue-shaped portion of the seal member 38 that rotates integrally is used.
  • a centrifugal force acts on 38 b in proportion to the material density of the seal member 38, so that the tongue 38 b extends in the circumferential direction, and as a result, the motor rotation axis of the tongue 38 b
  • the radius about the heart increases.
  • the tongue portion 38b of the seal member 38 separates from the cylindrical portion 32b of the stationary rim 32 that was in contact during low-speed rotation. Therefore, the tongue 38b of the seal member does not contact the stationary rim 32 during high-speed rotation. Because it is maintained, there is no fear of heat generation or wear.
  • the sealing function of the sealing member 38 is lost, but the above-described operation formed by the stationary rim 32 and the rotating rim 34 is performed.
  • the high-speed rotation provides a sufficient sealing function and prevents dust, water, oil, etc. from entering the motor from outside the motor. .
  • FIG. 3 is an enlarged view of a state in which the sealing member 38 of the shaft sealing device 30 performs a contact-type sealing operation in the low-speed rotation range of the motor.
  • the sealing member 38 contacts the cylindrical portion 32b of the stationary rim 32 and reliably shuts off the outside of the motor 10 from the inside of the motor 10 in the internal chamber 36. Therefore, even when the motor stops rotating, the shaft is naturally sealed to prevent dust and water.
  • the tongue-shaped portion 38b of the sealing member 38 is separated from the stationary rim 32 to maintain a non-contact state, while the labyrinth It can be understood that the shaft sealing action is achieved.
  • FIGS.5A and 5B show another embodiment of the shaft sealing device 30 according to the present invention, and this embodiment is different from the above-described embodiments of FIGS.
  • the mass 40 made of metal or an appropriate resin material is embedded in the tongue 38 b of the seal member 38 of the shaft seal device 30 to actively adjust and change the material density of the seal member 38.
  • the boundary region with the ring type shaft seal can be adjusted to an appropriate speed point in consideration of the speed region of the practical motor.
  • the mass of the mass body 40 itself is The experimental results were obtained in terms of the relationship between the switching speed from the shaft seal to the lip-shape seal, and the seal member 38 was formed at the stage of forming the seal member 38 with synthetic rubber. Embedded and enclosed in. Then, as shown in FIGS. 5A and 5B, the centrifugal force can be exerted by distributing and arranging at equal intervals around the circumference inside the tongue 38 b of the sealing member in advance during the molding process. Acts uniformly on the circumference, and it is possible to cause the separating action of the tongue 38b of the seal member 38 in the set rotation speed range. In Fig.
  • the horizontal axis indicates the number of rotations of the motor 10 per unit time
  • the vertical axis indicates the centrifugal force
  • the seal member 38 of the shaft sealing device 30 according to the change in the number of rotations is stationary. It is a curve showing the situation where it is separated from the rim 32 side.
  • the point P at points P, Q, and R on the curve is the rotation speed at which the labyrinth formed by the stationary rim 32 and the rotating rim 34 starts the shaft sealing function.
  • the centrifugal force acting on the seal member 38 at that rotation speed is at a relatively low level, and the tongue portion 38b still shows the contact-type sealing function.
  • the point Q is that the tongue 38b of the sealing member 38 of the shaft sealing device 30 gradually increases in centrifugal force as the rotation speed gradually increases, and the cylindrical portion 32 of the stationary rim 32. This indicates the point where the separation from b starts and therefore the contact-type sealing function is lost.
  • point R is a permissible peripheral speed point at which the sealing function can be maintained if the sealing member 38 of the shaft sealing device 30 does not separate from the cylindrical portion 32 b of the stationary rim 32. Is shown.
  • the rotational speed position Q at which the sealing member 38 deviates from the contact state with the stationary rim 32 is defined as the labyrinth sealing start speed point P and the permissible peripheral speed point of the sealing member 38.
  • the rotational speed position at the point Q can be appropriately adjusted in consideration of the practical rotational speed of the motor.
  • the shaft sealing device provided on the front side of the motor 10 is shown, but it goes without saying that a similar shaft sealing device is provided on the rear end side as well.
  • the shaft sealing device for an electric motor when the motor is used for a drive motor of a machine tool, changes from a stationary state of zero rotation speed to machining by high-speed rotation.
  • the oil-sealing contact-type sealing function and the labile-type non-contact sealing function function sequentially and in combination throughout the operation, so the waterproof and dustproof performance of the motor is highly reliable. It can be demonstrated under gender.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Un dispositif d'étanchéité d'arbre pour moteur électrique est disposé à au moins une extrémité d'un arbre de sortie (20) d'un moteur électrique (10) et à une extrémité d'un carter de stator (14) située en regard de ladite extrémité d'arbre de sortie. Ce dispositif d'étanchéité d'arbre comporte un bord fixe (32) ménagé sur le carter de stator (14) et un bord rotatif (34) ménagé dans une région terminale (20a) de l'arbre de sortie (20), et comporte également un système à labyrinthe constitué par les deux bords (32, 34), ainsi qu'un système d'étanchéité monté solidaire en rotation du bord rotatif (34) du système à labyrinthe et comprenant une partie inférieure (38a) et une partie en forme de languette (38b). L'extrémité de l'arbre est rendue étanche grâce à un fonctionnement en mode étanchéité de contact du système d'étanchéité jusqu'à ce que le moteur atteigne un régime prédéterminé, tandis que dans une plage de vitesses supérieure à ce régime prédéterminé, l'extrémité de l'arbre est rendue étanche grâce à un fonctionnement en mode étanchéité sans contact du système à labyrinthe, ce qui permet d'obtenir une étanchéité d'arbre homogène sur une plage étendue de régimes moteur allant du régime stationnaire aux régimes élevés en passant par les bas régimes, les modes de fonctionnement en étanchéité de contact et en étanchéité sans contact se combinant.
PCT/JP1994/001343 1993-08-12 1994-08-12 Dispositif d'etancheite d'arbre pour moteur electrique WO1995005699A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5200670A JPH0755012A (ja) 1993-08-12 1993-08-12 電動モータの軸封装置
JP5/200670 1993-08-12

Publications (1)

Publication Number Publication Date
WO1995005699A1 true WO1995005699A1 (fr) 1995-02-23

Family

ID=16428287

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1994/001343 WO1995005699A1 (fr) 1993-08-12 1994-08-12 Dispositif d'etancheite d'arbre pour moteur electrique

Country Status (2)

Country Link
JP (1) JPH0755012A (fr)
WO (1) WO1995005699A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100398881C (zh) * 2006-01-15 2008-07-02 杜杰 一种高速发动机轴密封方法
GB2440251B (en) * 2006-07-13 2011-06-01 Pml Flightlink Ltd Electric motors
CN104205580A (zh) * 2011-12-21 2014-12-10 教皇电机有限公司 电机的接地和/或密封组合
WO2014108231A3 (fr) * 2013-01-08 2015-02-19 Siemens Aktiengesellschaft Moteur logé dans un moyeu de roue et procédé permettant de rendre étanche un moteur logé dans un moyeu de roue
WO2021047381A1 (fr) * 2019-09-09 2021-03-18 卧龙电气驱动集团股份有限公司 Moteur à structure d'étanchéité double

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3453605B2 (ja) * 1993-09-17 2003-10-06 六菱ゴム株式会社 回転軸部シール装置
JP2001304278A (ja) 1999-10-08 2001-10-31 Nsk Ltd 密封形軸受装置
JP4531359B2 (ja) 2003-07-18 2010-08-25 三菱電機株式会社 モータ
CN104242550B (zh) * 2014-08-15 2016-08-24 浙江格美机电科技有限公司 耐高温高密封食品油循环系统专用电机
CN104791494B (zh) * 2015-04-24 2017-03-01 马鞍山格林环保科技股份有限公司 一种可移动密封装置
CN106026483A (zh) * 2016-08-01 2016-10-12 珠海格力节能环保制冷技术研究中心有限公司 车辆、驱动系统及其电机
CN106411021A (zh) * 2016-10-08 2017-02-15 上海川也电机有限公司 电机润滑油路的密封装置
JP6538788B2 (ja) * 2017-09-13 2019-07-03 ファナック株式会社 異物の侵入を抑制する電動機
JP7376326B2 (ja) * 2019-11-14 2023-11-08 ファナック株式会社 主軸装置
CN111409099B (zh) * 2020-05-12 2021-11-05 珠海格力智能装备有限公司 机器人关节及具有其的机器人

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128576U (fr) * 1974-04-09 1975-10-22
JPS57133257U (fr) * 1981-02-12 1982-08-19
JPS57195352U (fr) * 1981-06-03 1982-12-10

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128576U (fr) * 1974-04-09 1975-10-22
JPS57133257U (fr) * 1981-02-12 1982-08-19
JPS57195352U (fr) * 1981-06-03 1982-12-10

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100398881C (zh) * 2006-01-15 2008-07-02 杜杰 一种高速发动机轴密封方法
GB2440251B (en) * 2006-07-13 2011-06-01 Pml Flightlink Ltd Electric motors
US8688346B2 (en) 2006-07-13 2014-04-01 Protean Electric Limited Electric motors
US8688345B2 (en) 2006-07-13 2014-04-01 Protean Electric Limited Electric motors
US9065304B2 (en) 2006-07-13 2015-06-23 Protean Electric Limited Electric motors
CN104205580A (zh) * 2011-12-21 2014-12-10 教皇电机有限公司 电机的接地和/或密封组合
WO2014108231A3 (fr) * 2013-01-08 2015-02-19 Siemens Aktiengesellschaft Moteur logé dans un moyeu de roue et procédé permettant de rendre étanche un moteur logé dans un moyeu de roue
WO2021047381A1 (fr) * 2019-09-09 2021-03-18 卧龙电气驱动集团股份有限公司 Moteur à structure d'étanchéité double

Also Published As

Publication number Publication date
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