WO1992008271A1 - Dispositif d'etancheite pour arbre du type sans contact - Google Patents

Dispositif d'etancheite pour arbre du type sans contact Download PDF

Info

Publication number
WO1992008271A1
WO1992008271A1 PCT/JP1991/001479 JP9101479W WO9208271A1 WO 1992008271 A1 WO1992008271 A1 WO 1992008271A1 JP 9101479 W JP9101479 W JP 9101479W WO 9208271 A1 WO9208271 A1 WO 9208271A1
Authority
WO
WIPO (PCT)
Prior art keywords
annular plate
plate member
shaft
housing
output shaft
Prior art date
Application number
PCT/JP1991/001479
Other languages
English (en)
Japanese (ja)
Inventor
Kosei Nakamura
Yukio Katsuzawa
Shinichi Kinoshita
Original Assignee
Fanuc Ltd
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 Fanuc Ltd filed Critical Fanuc Ltd
Publication of WO1992008271A1 publication Critical patent/WO1992008271A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F16J15/4472—Labyrinth packings with axial path

Definitions

  • the present invention generally relates to a non-contact type shaft sealing device that suppresses movement of a liquid along a rotation axis, and particularly to a non-contact type of a gap between an output shaft of an electric motor and a housing with a liquid such as machine oil. It relates to a shaft sealing device that seals in a formula. Background art
  • the output shaft of the motor is integrally connected to the rotor, and is rotatably supported on the motor housing via a bearing.
  • An opening through which the output shaft penetrates is formed on the front surface of the motor housing, that is, an end face for attachment to the mating machine, and a bearing is disposed near the opening to support the output shaft.
  • the front surface of the housing may be exposed to, for example, machine oil such as lubricating oil scattered from a gear mechanism of a mating machine. Therefore, the gap between the inner peripheral surface of the opening and the outer surface of the output shaft is sealed by a liquid-tight means, and the machine oil penetrates into the inside of the motor through the gap to cause a failure due to electric leakage or the like. This eliminates the danger that the grease will seep into the bearings located in the car and flow out of the grease.
  • the transition from the immersion method to the injection method that sprays a predetermined amount of lubricating oil has been started.
  • the amount of lubricating oil supplied to the gear mechanism is smaller than in the immersion method. Therefore, for example, when the main shaft of a machine tool that adopts such an injection system for lubrication of a main shaft gear box is driven by an electric motor equipped with an oil seal on the output shaft, the amount of lubricating oil scattered from the main shaft gear box is reduced.
  • the relatively small amount inevitably reduces the amount of lubricating oil that reaches the lip of the oil seal, resulting in incomplete lubrication. This causes problems such as abnormal heat generation of the lip portion due to friction with the output shaft and reduction of the liquid-tight effect due to abnormal wear.
  • An object of the present invention is to provide a non-contact type shaft sealing device which has a simple structure, can be manufactured at low cost, and can be installed in a small space, and has a high liquid-tight effect.
  • the present invention provides a static head arranged in a non-contact manner between a housing and a rotating shaft which is rotatably supported by the housing through the housing.
  • a non-contact type shaft sealing device having a stop portion, and closing a gap between the housing and the rotating shaft to prevent a flow of liquid;
  • a through hole is formed in the core to allow the rotation shaft to pass through with a predetermined gap therebetween, and a surface of the rotation shaft protruding outward from the housing on the shaft end side surrounds the through hole.
  • a first annular plate member having a continuous groove having a bottom facing the rotating shaft; and a fitting hole for fitting the rotating shaft in a center portion, and fixed to the rotating shaft.
  • the second annular plate member is disposed on the shaft end side surface of the first annular plate member so as to be spaced apart from each other so as to shield a gap between the first annular plate member and the rotating shaft.
  • a non-contact type shaft sealing device characterized by comprising the above annular plate member.
  • a motor housing having an opening capable of facing a mating machine and an output shaft of the motor rotatably supported by the housing through the opening of the housing so as to be rotatable.
  • a non-contact type sealing device having a stationary portion arranged in non-contact with respect to the output shaft, and closing a gap between the housing and the output shaft in the opening to suppress a flow of liquid;
  • a through hole is formed at an outer peripheral edge of the housing, which is fixed to the vicinity of the opening of the housing, and has a central portion formed with a through hole for allowing the output shaft to pass therethrough with a predetermined gap therebetween.
  • a first annular plate member having a continuous groove formed on a surface on the shaft end side of the shaft and surrounding the through hole and having a bottom portion facing the output shaft; and fitting the output shaft in a central portion. Form a fitting hole and exit A first annular plate member fixed to the shaft, and spaced apart from and opposed to the shaft end side surface of the first annular plate member so as to shield a gap between the first annular plate member and the output shaft.
  • a non-contact type shaft sealing device characterized by comprising:
  • the second annular plate member has an outer peripheral region inclined toward the first annular plate member.
  • the first annular plate member fixed to the motor housing is opened. Most of the gap between the housing and the output shaft at the mouth is shielded to catch liquid such as machine oil scattered from the partner machine.
  • the gap between the first annular plate member and the output shaft is shielded by the second annular plate member fixed to the output shaft.
  • the output shaft When the output shaft is oriented horizontally or obliquely, it flows along the surface of the first annular plate member, further flows down while being accumulated in the continuous groove, and is discharged downward.
  • the liquid scattered to a position radially distant from the periphery of the output shaft is directly received by the surface of the first annular plate member, and thereafter discharged to the outside in the same manner as described above. In this way, the gap between the housing and the output shaft at the opening is reliably sealed against the splashed liquid, and the intrusion of the liquid into the motor is prevented.
  • FIG. 1 is a longitudinal sectional view of a motor provided with a non-contact type shaft sealing device according to an embodiment of the present invention
  • Fig. 2 shows the first annular plate in the non-contact type shaft seal device of Fig. 1. Front view of the material
  • FIG. 3 is a front view of a second annular plate member in the non-contact type shaft sealing device of FIG. 1,
  • FIG. 4 is a front view of a third annular plate member in the non-contact type shaft sealing device of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • an electric motor including a non-contact type shaft sealing device is integrally fixed to a bottomed cylindrical housing 10 and an inner peripheral portion of a housing 10.
  • the housing includes a stay 12 and a rotor 14 surrounded by the stator 12 and rotatably supported by the housing 10.
  • the housing 10 includes a front housing 10 a for fixing the stay 12 and forming a mounting end face to the counterpart machine, and a rear housing 10 b for closing a bottom of the housing 10.
  • the output shaft 16 of the motor is integrally fixed to the rotor 14, and passes through the mouth 14, and the bearings 18 a, 18 a, which are respectively housed in the front and rear housings 10 a, 10 b.
  • An opening 20 through which the output shaft 16 penetrates is formed on the end face of the front housing 10a.
  • a bearing 18a of the front housing 10a is attached to the opening 20.
  • the output shaft 16 is supported concentrically. Therefore, an annular gap 22 surrounding the output shaft 16 is formed between the output shaft 16 and the front housing 10a in front of the bearing 18a in the opening 20.
  • the electric motor has a non-contact type shaft sealing device according to the embodiment of the present invention disposed close to the opening 20.
  • This non-contact type shaft sealing device is configured by arranging annular sheet metal members 24, 26, 28 shown in FIGS. 2 to 4 in a positional relationship as shown in FIG.
  • the first annular plate member 24 has an annular flange 24 a on an outer peripheral edge thereof, and the first annular plate member 24 has an opening 20 at an end face of the front housing i 0 a.
  • the annular flange 24a is fixed to the front housing 10a by, for example, fitting the annular flange 24a into the annular projection 30 formed therearound by shrink fitting or the like.
  • a through hole 24b through which the output shaft 16 is inserted with a small gap therebetween is formed in the center of the first annular plate member 24, a through hole 24b through which the output shaft 16 is inserted with a small gap therebetween is formed.
  • the inner peripheral edge surrounding the through hole 24 b is curved toward the front side facing the shaft end of the output shaft 16, thereby forming a substantially V-shaped section with the bottom portion facing the output shaft 16.
  • a continuous groove 24c is formed.
  • the second annular plate member 26 has a central hole formed with a fitting hole 26 a for fitting the output shaft 16, and a fitting hole 26 a It has an annular flange 26b on the inner periphery surrounding it.
  • the second annular plate member 26 is fixed to the output shaft 16 by an annular flange 26b, for example, by shrink fitting, and a gap between the first annular plate member 24 and the output shaft 16 is provided.
  • the first annular plate member 24 is opposed to the front surface of the first annular plate member 24 so as to be shielded from the air.
  • the second annular plate member 26 has an annular bent portion 26c on the way from the inner peripheral edge to the outer peripheral edge, and the second annular plate member 26 covers the continuous groove 24c of the first annular plate member 24.
  • the first annular plate member 24 has an outer peripheral area 26 d inclined in the direction of the fourth direction. A minute gap is always formed between the periphery of the outer peripheral area 26 d of the second annular plate member 26 and the front surface of the first annular plate member 24.
  • the above-mentioned non-contact type shaft seal device is provided with the above-mentioned two annular plate members 24 and 26 which make the stationary portion and the rotating portion non-contact with each other, thereby preventing liquid such as lubricating oil or the like from splashing. It is possible to close the gap 22 between the openings 20.
  • the third annular plate member 2 shown in FIG. 8 is further disposed in front of the second annular plate member 26.
  • the third annular plate member 28 has an annular flange 28a formed on the outer peripheral edge thereof, and the first annular plate member 24 It is fitted and fixed in the annular projection 30 of the front housing 10a, for example, by shrink fitting, so as to overlap the inside of the annular flange 24a.
  • the upper half of the third annular plate member 28 is formed with a cover portion 28 b projecting toward the shaft end of the output shaft 16 and extending near the output shaft 16, and an inner peripheral edge of the cover portion 28 b is formed.
  • an arc-shaped notch 28c is formed to allow the output shaft 16 to be separated from and pass through.
  • the third annular plate member 28 covers the first annular plate member 24 and the second annular plate member 26 with a force bar portion 28b, and is provided between the annular plate members 24 and 26. Shield small gaps. All of the above three annular plate members 24, 26, and 28 can be easily manufactured by press molding and can be easily assembled as described above, so that the cost is low.
  • the first annular plate member 24 When the output shaft 16 rotates, the first annular plate member 24 is stationary and covers most of the gap 22 in the opening 20 in front of the bearing 18a. At this time, a minute gap is left between the inner peripheral edge of the first annular plate member 24 and the outer peripheral surface of the rotating output shaft 16.
  • the second annular plate member 26 is arranged in front of the first annular plate member so as to shield this gap, and rotates together with the output shaft 16.
  • the third annular plate member 28 is statically disposed in front of the second annular plate member 26 without contact with the second annular plate member 26 and the output shaft 16.
  • the third annular plate member 28 has a cover portion 28 b Thereby, the upper half areas of the first and second annular plate members 24 and 26 are shielded. As a result, the amount of oil droplets accumulated in the continuous groove 24c of the first annular plate member 24 is reduced, and the lubricant oil is prevented from overflowing from the continuous groove 24c. Oil droplets adhering to the outer surface of the cover portion 28b of the third annular plate member 28 flow downward as it is.
  • the continuous groove 24 c Prevents the direct accumulation of oil droplets on the oil and prevents the lubricant from overflowing from the continuous groove 24c.
  • the continuous groove 24c is provided not at the entire inner peripheral edge of the first annular plate member 24 as described above but at least in the upper half of the inner peripheral edge.
  • the non-contact type shaft sealing device includes the second annular plate member that rotates integrally with the rotating shaft, and the first annular plate member that comes to rest in non-contact with the rotating shaft.
  • the first annular plate member, which is a stationary portion, and the second annular plate member, which is a rotating portion, and the rotating shaft are always kept in a non-contact state, so that damage due to wear or the like is completely avoided.
  • a third annular plate member is further provided as a stationary portion. Therefore, according to the present invention, there is provided a non-contact type shaft sealing device having a high liquid-tight effect, which is simple in structure, can be manufactured at low cost, and can be installed in a small space.

Landscapes

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

Abstract

L'invention se rapporte à un dispositif d'étanchéité pour arbre du type sans contact, dont la structure est simplifiée, qui est fabriqué à moindres coûts, qu'on peut installer dans un espace limité et qui possède une grande capacité d'étanchéité aux liquides. Ce dispositif est conçu de sorte qu'un espace libre, formé entre un logement et un arbre de sortie traversant une ouverture du logement, est fermé pour permettre la régulation du flux de liquide entre le logement d'un moteur électrique, dont l'ouverture est opposée à une machine accouplée, et l'arbre de sortie du moteur électrique, soutenu en rotation par le logement et s'étendant à travers l'ouverture du logement. Une première plaque annulaire (24) est fixée par son bord périphérique externe à une partie proche de l'ouverture (20) du logement. Cette plaque comporte dans sa partie centrale un trou d'introduction (24b) recevant l'arbre de sortie (16) avec un espace libre prédéterminé entre eux et elle forme dans la surface terminale de l'arbre de sortie une rainure continue (24c) entourant le trou d'introduction (24b) et ayant un fond opposé à l'arbre de sortie. Une seconde plaque annulaire (26) comporte dans sa partie centrale un trou d'introduction (26a) destiné à recevoir l'arbre de sortie. Cette seconde plaque est fixée à l'arbre de sortie et est elle disposée de façon à être opposée à distance, côté extrémité de l'arbre, à la première plaque annulaire (24), afin de former une barrière qui ferme l'espace libre compris entre la première plaque annulaire (24) et l'arbre de sortie.
PCT/JP1991/001479 1990-10-31 1991-10-29 Dispositif d'etancheite pour arbre du type sans contact WO1992008271A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2/291697 1990-10-31
JP2291697A JP2818022B2 (ja) 1990-10-31 1990-10-31 電動機出力軸の非接触シール装置

Publications (1)

Publication Number Publication Date
WO1992008271A1 true WO1992008271A1 (fr) 1992-05-14

Family

ID=17772232

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1991/001479 WO1992008271A1 (fr) 1990-10-31 1991-10-29 Dispositif d'etancheite pour arbre du type sans contact

Country Status (2)

Country Link
JP (1) JP2818022B2 (fr)
WO (1) WO1992008271A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014233117A (ja) * 2013-05-28 2014-12-11 株式会社荏原製作所 潤滑油流出抑制装置、回転機械、潤滑油の流出抑制方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512783U (fr) * 1978-07-12 1980-01-26
JPS5524039U (fr) * 1978-08-03 1980-02-16
JPS58115861U (ja) * 1982-02-01 1983-08-08 松下電器産業株式会社 小型電動機

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5640456U (fr) * 1979-09-05 1981-04-15
JPS5892857U (ja) * 1981-12-17 1983-06-23 三菱電機株式会社 回転機の軸封装置
JPS5925941U (ja) * 1982-08-10 1984-02-17 三菱電機株式会社 回転機の軸封装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512783U (fr) * 1978-07-12 1980-01-26
JPS5524039U (fr) * 1978-08-03 1980-02-16
JPS58115861U (ja) * 1982-02-01 1983-08-08 松下電器産業株式会社 小型電動機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014233117A (ja) * 2013-05-28 2014-12-11 株式会社荏原製作所 潤滑油流出抑制装置、回転機械、潤滑油の流出抑制方法

Also Published As

Publication number Publication date
JP2818022B2 (ja) 1998-10-30
JPH04168946A (ja) 1992-06-17

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