WO2019214189A1 - Structure à double palier pour l'extrémité de positionnement d'un moteur de traction - Google Patents

Structure à double palier pour l'extrémité de positionnement d'un moteur de traction Download PDF

Info

Publication number
WO2019214189A1
WO2019214189A1 PCT/CN2018/114165 CN2018114165W WO2019214189A1 WO 2019214189 A1 WO2019214189 A1 WO 2019214189A1 CN 2018114165 W CN2018114165 W CN 2018114165W WO 2019214189 A1 WO2019214189 A1 WO 2019214189A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
ring
outer ring
end surface
point contact
Prior art date
Application number
PCT/CN2018/114165
Other languages
English (en)
Chinese (zh)
Inventor
李广
郭晏麟
马千柱
刘晨晓
黄晓云
Original Assignee
中车永济电机有限公司
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 中车永济电机有限公司 filed Critical 中车永济电机有限公司
Publication of WO2019214189A1 publication Critical patent/WO2019214189A1/fr

Links

Images

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
    • H02K5/16—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
    • H02K5/1735—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 radially supporting the rotary shaft at only one end of the rotor
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/061—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing mounting a plurality of bearings side by side
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Definitions

  • the invention relates to the field of traction motors, in particular to a double bearing structure of a traction motor positioning end.
  • Traction motor refers to the motor used for traction on railway trunk electric locomotives, industrial and mining electric locomotives, electric drive diesel locomotives and various electric vehicles (such as battery vehicles, city trams, underground railway electric vehicles, etc.).
  • the traction motor generally has two sets of bearings at both ends of the rotating shaft, one set is a positioning end bearing, and the other set is a floating end bearing.
  • the existing traction motor generally adopts a combination of a cylindrical roller bearing with a rim on the outer ring and a four-point contact ball bearing as a classic configuration of the positioning end bearing, and the cylindrical roller bearing is used to carry the radial load, the four-point contact ball.
  • the bearings are used to carry axial loads.
  • a bearing housing of a conventional double-bearing structure adopts a first-order stepped hole which is gradually expanded from the inside to the outside, and a stepped surface of the stepped hole is located at an inner end of the stepped hole, and when installed, the inner seal is firstly installed.
  • Ring 5', cylindrical roller bearing outer ring, outer ring spacer 8' and four-point contact ball bearing outer ring are sequentially loaded into the bearing housing 2' from one direction, and then the assembly is placed on the already installed sleeve 3 ', cylindrical roller bearing inner ring 6', inner ring spacer 7' and four-point contact ball bearing inner ring 9' on the rotating shaft 4', and finally through the outer sealing ring 10' axial compression of the four-point contact ball bearing The ring is axially pressed against the inner ring of the four-point contact ball bearing through the tachometer 12'.
  • Such a structure may cause unevenness of the outer seal ring end face due to the influence of the cumulative tolerance.
  • the four-point contact ball bearing outer ring is compressed without axial floating space, so that the four-point contact ball bearing can withstand additional loads due to thermal expansion of the shaft or slight misalignment of the inner and outer rings. Eventually, the operating conditions of the four-point contact ball bearing deteriorated and even burned.
  • the invention aims to solve the technical problem that the cumulative tolerance of the double bearing structure of the positioning end of the existing traction motor is too large and the surface pressure of the outer sealing ring is uneven.
  • the present invention proposes a double bearing structure for the positioning end of the traction motor.
  • a double-bearing structure for a traction motor positioning end comprising a fixedly disposed bearing seat (the so-called fixing is fixed to the motor shaft, preferably, the bearing seat is fixed on the end cover of the motor), and the bearing seat is provided with a stepped hole which is tapered inside and outside, a stepped surface of the stepped hole is located in a middle portion of the stepped hole, the stepped hole is formed by a first cylindrical hole located inside the stepped surface and a second cylindrical hole located outside the stepped surface
  • the first cylindrical hole is sleeved with an outer ring spacer, the outer end surface of the outer ring spacer abuts on the step surface, and the inner end surface of the outer ring spacer is adjacently provided with an interference fit in the bearing
  • the cylindrical roller bearing outer ring on the inner wall of the seat (the "inner” as used herein refers to the position near the middle of the rotating shaft and away from the end of the rotating shaft, and the “outer” refers to the position away from the middle
  • the inner bearing is fixed on the inner end surface of the bearing housing, and the inner bearing cover abuts the inner end surface of the outer ring of the cylindrical roller bearing, that is, through the inner portion.
  • Bearing cap abuts cylindrical roller
  • the inner end surface of the outer ring of the bearing and the outer end surface of the outer ring spacer abut the step surface to realize axial positioning of the component in the first cylindrical hole; the second cylindrical hole is sleeved with a four-point contact ball bearing outer ring
  • the bearing seat is further provided with an outer sealing ring fixed on the outer end surface of the bearing seat; the inner ring of the cylindrical roller bearing corresponding to the outer ring of the cylindrical roller bearing, the outer ring spacer and the outer ring of the four-point contact ball bearing,
  • the inner ring of the spacer sleeve and the four-point contact ball bearing are sequentially arranged on the rotating shaft from the inner side to the outer side, and the inner end surface of the inner ring of the cylindrical roller bearing is adjacently provided with
  • the cylindrical roller bearing is subjected to radial load, and the four-point contact ball bearing is subjected to axial load.
  • the cylindrical roller bearing and the four-point contact ball bearing are respectively fitted into the bearing seat from the inner and outer sides of the bearing housing.
  • the outer ring of the cylindrical roller bearing is pressed by the inner bearing cap, which greatly reduces the influence of the axial cumulative error when loading from one direction.
  • the width of the outer ring of the four-point contact ball bearing is smaller than the axial length of the second cylindrical hole (here, although the width of the outer ring of the four-point contact ball bearing is indicated to be smaller than the axial length of the second cylindrical hole, the person skilled in the art It is well known that the relative dimensions should be within a reasonable range and cannot be too different. This is only to ensure that the four-point contact ball bearing does not bear extra load.
  • the four-point contact ball bearing outer ring is not compressed.
  • the shaft will be The thermal expansion occurs and axial deformation occurs, and the four-point contact ball bearing outer ring will move axially in the defined area along with the thermal expansion of the rotating shaft to avoid additional axial load.
  • the outer end surface of the outer ring of the four-point contact ball bearing is provided with a plurality of positioning slots, and the corresponding positioning slots on the inner end surface of the outer sealing ring are provided with a plurality of blind holes, and the corresponding blind holes and the positioning slots of each group are common A positioning pin is inserted through, and the positioning pin prevents the four-point contact ball bearing outer ring from rotating together with the rotating shaft.
  • outer ring spacer axially protrudes radially inward to form an annular partition, and the annular spacer of the outer ring spacer is provided with a fat-filling hole on both sides.
  • the two bearing chambers can be supplemented with grease by the fat-filling holes, and the lubricating effect of the grease is improved as a whole.
  • the outer end surface of the bearing housing is provided with an annular groove coaxial with the rotating shaft, and the annular groove is embedded with a sealing gasket, and the sealing gasket is pressed into the annular groove by the outer sealing ring.
  • the outer sealing ring is pressed on the outer end surface of the bearing seat, which is a rigid contact, and the positioning effect is better, and the sealing gasket in the annular groove is pressed tightly to improve the sealing performance.
  • the invention provides a double bearing structure of a positioning end of a traction motor, the bearing seat is provided with a stepped hole of a first step which is tapered from the inside to the outside, and the step surface of the stepped hole is located in the middle of the stepped hole Cylindrical roller bearing and four-point contact ball bearing are respectively fitted into the bearing seat from the inner and outer sides of the bearing housing, and the outer ring of the cylindrical roller bearing is axially compressed by the inner bearing cover and the step surface, and the structure and the mounting manner are effective.
  • the influence of the axial cumulative error when loading from one direction is reduced; in addition, the outer ring of the four-point contact ball bearing is not compressed, and the shaft is thermally expanded and axially deformed during the operation of the motor, and the four-point contact ball
  • the outer ring of the bearing will move axially with the thermal expansion of the rotating shaft to avoid additional axial load; the annular baffle of the outer ring spacer is provided with a fat-filling hole on both sides, through which the two holes can be
  • the bearing chambers act as a supplement to the grease, which improves the lubrication of the grease as a whole.
  • FIG. 1 is a schematic view of a prior art mounting structure of the present invention
  • Figure 2 is a schematic view of the mounting structure of the present invention.
  • a double-bearing structure for a positioning end of a traction motor comprising a fixed bearing housing 2 (the so-called fixing is fixed to the motor shaft 4, preferably, the bearing housing 2 is fixed on the end cover 1 of the motor), the bearing
  • the seat 2 is provided with a stepped hole which is tapered from the inside to the outside, and a stepped surface 18 of the stepped hole is located at a middle portion of the stepped hole, the stepped hole is defined by a first cylindrical hole located inside the stepped surface 18 and at the step a second cylindrical hole on the outer side of the surface 18; the first cylindrical hole is sleeved with an outer ring spacer 17, and an outer end surface of the outer ring spacer 17 abuts on the step surface 18, the outer ring spacer
  • the inner end surface of the sleeve 17 is adjacently provided with a cylindrical roller bearing outer ring 15 which is fitted over the inner wall of the bearing housing 2 (the term "inner” as used herein refers to a position near the middle of the
  • the bearing housing 2 is also provided with an inner bearing fixed to the inner end surface of the bearing housing 2 a cover 5, the inner bearing cap 5 abuts against an inner end surface of the outer ring 15 of the cylindrical roller bearing, That is, the inner end surface of the cylindrical roller bearing outer ring 15 is abutted by the inner bearing cover 5, and the outer end surface of the outer ring spacer 17 abuts the step surface 18 to realize axial positioning of the components in the first cylindrical hole; the second cylinder
  • the hole is sleeved with a four-point contact ball bearing outer ring 16, and the bearing block 2 is further provided with an outer sealing ring 11 fixed on the outer end surface of the bearing housing 2; corresponding to the cylindrical roller bearing outer ring 15, the outer ring spacer
  • the sleeve 17 and the four-point contact ball bearing outer ring 16 are provided with a cylindrical roller bearing inner ring 6, an inner ring spacer 7 and a four-point contact ball bearing inner ring 9 which are sequentially adjacent to each other on the rotating shaft 4 from the
  • the inner end surface of the inner ring 6 of the cylindrical roller bearing is adjacently provided with a sleeve 3 fixed on the rotating shaft 4, and the inner ring 9 of the four-point contact ball bearing is assembled by an inner half ring and an outer half ring, the outer half
  • the outer end surface of the ring is adjacently provided with a speed measuring sprocket 13 fixed to the rotating shaft 4, that is, the axial positioning of the inner ring components is realized by the sleeve 3 and the speed measuring sprocket 13.
  • the cylindrical roller bearing and the four-point contact ball bearing are respectively fitted into the bearing seat from the inner and outer sides of the bearing housing 2, respectively. 2.
  • the cylindrical roller bearing outer ring 15 is pressed by the inner bearing cap 5, greatly reducing the influence of the axial cumulative error when loaded from one direction.
  • the width of the four-point contact ball bearing outer ring 16 is smaller than the axial length of the second cylindrical hole (here, although the width of the four-point contact ball bearing outer ring 16 is smaller than the axial length of the second cylindrical hole, It is well known in the field that the relative size should be within a reasonable range and cannot be too different. This is only to ensure that the four-point contact ball bearing does not bear extra load.
  • the four-point contact ball bearing outer ring 16 is not pressed, and the motor is in operation.
  • the shaft 4 undergoes thermal expansion to undergo axial deformation, and the four-point contact ball bearing outer ring 16 will move axially in the defined area along with the thermal expansion of the rotating shaft 4 to avoid additional axial load.
  • the outer end surface of the outer ring 16 of the four-point contact ball bearing is provided with a plurality of positioning slots, and the corresponding positioning slots on the inner end surface of the outer sealing ring 11 are provided with a plurality of blind holes, and each set of corresponding blind holes and positioning slots
  • a positioning pin 10 is inserted through the positioning pin 10 to prevent the four-point contact ball bearing outer ring 16 from rotating together with the rotating shaft 4.
  • the positioning pin 10 is mainly arranged to prevent the four-point contact ball bearing outer ring 16 from rotating along with the rotating shaft 4, thereby affecting the normal operation of the motor.
  • the outer ring spacer 8 protrudes radially inward from the axial direction to form an annular partition plate 17, and the annular partition plate 17 of the outer ring spacer 8 is provided with a fat-filling hole on both sides thereof.
  • the two bearing chambers can be supplemented with grease by the fat-filling holes, and the lubricating effect of the grease is improved as a whole.
  • the outer end surface of the bearing housing 2 is provided with an annular groove coaxial with the rotating shaft 4, and the annular groove is embedded with a gasket 12, and the gasket 12 is pressed by the outer sealing ring 11 In the annular groove.
  • the outer sealing ring 11 is pressed against the outer end surface of the bearing housing 2, which is a rigid contact, and the positioning effect is better, and the sealing gasket 12 in the annular groove is pressed tightly to improve the sealing performance.
  • an outer bearing cover 14 is provided at the outer end of the rotating shaft 4, and the outer bearing cover 14 is fixed to the end cover 1 to protect the entire double bearing structure.
  • the annular groove is uniformly distributed with a plurality of screw holes in the circumferential direction, and the outer sealing ring 11 is provided with a plurality of through holes corresponding to the screw holes, and the bolt passes through the through hole.
  • the hole is screwed into the screw hole to fix the outer seal ring 11 and the bearing housing 2.
  • the inner bearing cap 5 is bolted to the inner surface of the bearing housing 2.
  • the double bearing structure of the positioning end of the traction motor provided by the invention is installed by the following method:
  • the outer ring spacer 8 is fitted into the first cylindrical hole to be placed on the inner end surface of the shoulder;
  • the cylindrical roller bearing outer ring 15 is pressed into the first cylindrical hole, so that the outer end surface abuts against the inner end surface of the outer ring spacer 8;
  • the inner bearing cap 5 is fixed to the inner end surface of the bearing housing 2 so as to abut against the inner end surface of the cylindrical roller bearing 6, preferably by bolt fixing;
  • step d Insert the assembled housing 2 assembly in step d (here, the bearing housing 2 assembly mainly includes the bearing housing 2 and the components installed in the bearing housing 2 or the end surface in step bd) into the assembled shaft 4 in step a.
  • the assembly where the shaft 4 assembly mainly includes the rotating shaft 4 and the components set on the rotating shaft 4;
  • the four-point contact ball bearing outer ring 16 is inserted into the second cylindrical hole, where the four-point contact ball bearing outer ring 16 is in clearance with the bearing seat 2, so the outer ring is finally inserted;
  • the speed detecting sprocket 13 is fixed to the rotating shaft 4 such that its inner end surface abuts against the outer end surface of the outer half ring of the four-point contact ball bearing inner ring 9.
  • the four-point contact ball bearing outer ring 16 is disposed on the inner wall of the bearing housing 2, and the four-point contact ball bearing is mainly used for axial positioning, so the gap installation is more convenient and easy.
  • the rolling elements of the cylindrical roller bearing 6 are mounted on the outer ring 15 of the cylindrical roller bearing through the bracket; between the steps f and g, the rolling elements of the four-point contact ball bearing are passed through the bracket It is mounted on the outer ring 16 of the four-point contact ball bearing.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

L'invention concerne une structure à double palier pour une extrémité de positionnement d'un moteur de traction, se rapportant au domaine des moteurs de traction, et en particulier une structure à double palier pour une extrémité de positionnement d'un moteur de traction. La solution technique est la suivante : un corps de palier est pourvu d'un trou étagé d'un cran effilé de l'intérieur vers l'extérieur, la face étagée du trou étagé étant située au milieu du trou étagé; un roulement à rouleaux cylindriques et un roulement à billes à contact à quatre points sont respectivement montés dans le corps de palier à partir de chaque extrémité du corps de palier; l'anneau externe du roulement à rouleaux cylindriques est pressée par un capuchon de palier interne, de telle sorte que l'influence de l'erreur cumulative axiale provoquée par le montage à partir d'une certaine direction peut être réduite, ce qui permet d'éviter le problème selon lequel la surface d'un anneau d'étanchéité externe ne peut pas être pressée pour être mise à niveau. La présente invention est principalement appliquée à un moteur de traction, et elle concerne une structure à double palier pour une extrémité de positionnement d'un moteur de traction emmanché sur un arbre rotatif.
PCT/CN2018/114165 2018-05-08 2018-11-06 Structure à double palier pour l'extrémité de positionnement d'un moteur de traction WO2019214189A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810434078.2 2018-05-08
CN201810434078.2A CN108696037A (zh) 2018-05-08 2018-05-08 一种牵引电机定位端双轴承结构

Publications (1)

Publication Number Publication Date
WO2019214189A1 true WO2019214189A1 (fr) 2019-11-14

Family

ID=63847316

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/114165 WO2019214189A1 (fr) 2018-05-08 2018-11-06 Structure à double palier pour l'extrémité de positionnement d'un moteur de traction

Country Status (2)

Country Link
CN (1) CN108696037A (fr)
WO (1) WO2019214189A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108696037A (zh) * 2018-05-08 2018-10-23 中车永济电机有限公司 一种牵引电机定位端双轴承结构
CN109494923B (zh) * 2019-01-07 2024-04-16 中国国家铁路集团有限公司 交流传动机车牵引电机轴承非传动端安装结构
CN112713726B (zh) * 2020-12-25 2022-11-29 中车永济电机有限公司 一种带轴伸的牵引电机轴承运输防护工装
CN113446322B (zh) * 2021-07-26 2022-06-14 太原重工股份有限公司 油膜轴承的端罩箱盖装置
CN113460850B (zh) * 2021-07-28 2022-11-08 中车永济电机有限公司 一种机车牵引电机分体式圆柱滚子轴承外圈吊运装配工装

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022408A1 (de) * 1999-06-08 2000-12-14 Prec Motors Deutsche Minebea G Festplattenlaufwerk mit Spindellagersystem
CN105141065A (zh) * 2015-10-15 2015-12-09 苏州萨伯工业设计有限公司 一种采煤机截割部用隔爆型三相异步电动机
CN105186763A (zh) * 2015-10-15 2015-12-23 苏州萨伯工业设计有限公司 一种电动机轴承结构
CN108696037A (zh) * 2018-05-08 2018-10-23 中车永济电机有限公司 一种牵引电机定位端双轴承结构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101764452A (zh) * 2009-09-24 2010-06-30 无锡哈电电机有限公司 高压电机轴承保护装置
US9685839B2 (en) * 2013-03-20 2017-06-20 Fxq Engineering Group, Llc Bearing implementation for a rotating electrical device
CN103343779B (zh) * 2013-07-22 2016-02-24 河南黎明重工科技股份有限公司 立轴冲击式破碎机传动轴承装置
CN103730976B (zh) * 2013-11-30 2016-02-17 南阳防爆集团股份有限公司 煤矿主通风机用电机的稀油润滑轴承装置
CN107508410A (zh) * 2017-10-13 2017-12-22 江苏中车电机有限公司 一种带有双润滑系统的电机用双轴承结构

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022408A1 (de) * 1999-06-08 2000-12-14 Prec Motors Deutsche Minebea G Festplattenlaufwerk mit Spindellagersystem
CN105141065A (zh) * 2015-10-15 2015-12-09 苏州萨伯工业设计有限公司 一种采煤机截割部用隔爆型三相异步电动机
CN105186763A (zh) * 2015-10-15 2015-12-23 苏州萨伯工业设计有限公司 一种电动机轴承结构
CN108696037A (zh) * 2018-05-08 2018-10-23 中车永济电机有限公司 一种牵引电机定位端双轴承结构

Also Published As

Publication number Publication date
CN108696037A (zh) 2018-10-23

Similar Documents

Publication Publication Date Title
WO2019214189A1 (fr) Structure à double palier pour l'extrémité de positionnement d'un moteur de traction
US8882360B2 (en) Conical roller bearing device
WO2013047695A1 (fr) Dispositif de palier pour roue doté d'un moteur intégré dans la roue
WO2014045934A1 (fr) Palier de production d'énergie éolienne/marémotrice
CN102528742A (zh) 用于拆卸滚动轴承的拆卸工具
BR112013032058B1 (pt) método de fabricar uma vedação para mancal
CN110617276A (zh) 一种电驱动总成辅助轴承固定结构和电驱动总成
CN106945462B (zh) 一种轻量化长寿命轮毂单元总成
CN105782238A (zh) 一种径轴向复合圆柱滚子轴承
CN206738387U (zh) 圆柱滚针组合轴承
JP5913925B2 (ja) インホイール型モータ内蔵車輪用軸受装置
CN201934525U (zh) 带t型锁紧装置的双列球面滚子轴承单元
US9205737B2 (en) Seal body, apparatus and method
CN212407330U (zh) 一种轴、径向组合式防倾翻轴承总成
JP2013024354A (ja) 回転軸装置
CN203248525U (zh) 一种滚动轴承
JP3655133B2 (ja) ドライブシャフト用軸受装置
JP2001254735A (ja) 車軸軸受装置
JP5408764B2 (ja) パックシール
CN203335213U (zh) 风扇托架总成
RU2235034C1 (ru) Каток гусеничного транспортного средства
CN213451383U (zh) 带密封结构的轮毂轴承
CN216589581U (zh) 一种汽车转向节轴承密封结构
CN212839240U (zh) 一种压滤机拉板装置的输入轴结构
JP5692437B2 (ja) 車輪支持用軸受ユニット

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18918294

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18918294

Country of ref document: EP

Kind code of ref document: A1