WO2014069975A1 - Proceso de sallado de motores eléctricos para la aplicación de lubricación por niebla - Google Patents
Proceso de sallado de motores eléctricos para la aplicación de lubricación por niebla Download PDFInfo
- Publication number
- WO2014069975A1 WO2014069975A1 PCT/MX2012/000109 MX2012000109W WO2014069975A1 WO 2014069975 A1 WO2014069975 A1 WO 2014069975A1 MX 2012000109 W MX2012000109 W MX 2012000109W WO 2014069975 A1 WO2014069975 A1 WO 2014069975A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal
- engine
- mist
- electric motors
- bearing
- Prior art date
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
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
-
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
- F16C33/6662—Details of supply of the liquid to the bearing, e.g. passages or nozzles the liquid being carried by air or other gases, e.g. mist lubrication
-
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
-
- 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
- F16J15/16—Sealings between relatively-moving surfaces
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0006—Disassembling, repairing or modifying dynamo-electric machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/16—Centering rotors within the stator; Balancing rotors
- H02K15/165—Balancing the rotor
-
- 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
- H02K5/1732—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 both ends of the rotor
-
- 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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- 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
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/30—Fluoropolymers
- F16C2208/32—Polytetrafluorethylene [PTFE]
-
- 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 present invention relates to a process for applying a seal of a composite material, consisting of carbon fibers retained in a polytetrafluoroethylene fluorocarbon resin matrix.
- This seal is applied to the housing of electric motor bearings, and more specifically for the application of mist lubrication. Likewise, it refers to the device that provides the seal between said housings and the interior of the engine.
- the object of the present invention is to provide a process to modify the electric motors in order to seal the passage of the integrated mist by air and lubricant between the bearing housing and the interior of said motors, lay the foundations and methodology for manufacture the corresponding device that keeps the oil mist inside the housing of each bearing, prevents the passage of oil into the engine, and in case of high vibrations or failure of a bearing, provide additional radial support to the shaft or shaft engine.
- the lubrication of the motor bearings is done by means of grease.
- Grease injection is used by grease fittings by manual grease pumps, or in certain cases sealed and lubricated bearings are used for life.
- This grease lubrication has the disadvantages that excessive grease feed causes temperature rise and reduced bearing life.
- insufficient lubrication or without the correct frequency causes bearing failure due to lack of lubrication, the pressure of the grease pump causes this lubricant to flow into the interior soiling the windings, the rotor itself and causing more heating.
- the grease injection operation can introduce foreign particles that will damage the bearings causing premature failure.
- elastomeric seals are used that have lips that press the arrow with the help of a circumferential spring. These seals give little protection, wear out of foreign particles, wear to the arrow and fail frequently before fulfilling the life of the bearings. Likewise, by failing they contribute to the failure of the bearings.
- grease lubrication is replaced by oil that forms a puddle of liquid that covers part of the bearing. This oil is difficult to keep and leaks without lubrication to the bearing, so it is not reliable.
- mist lubrication which consists of a constant stream of air with small drops of suspended oil. When circulating, this fog lubricates the bearings, dissipates heat, cleanses them and keeps pollutants out.
- these systems require that the flow of air and lubricant be maintained in the bearing housing chambers and not penetrate other parts of the lubricated equipment, in this case the electric motors.
- the seal systems must be suitable for the necessary tightness. Labyrinth seals do not prevent leakage of lubricating mist into the engine and mechanical contact seals are not applicable because there is no space needed to accommodate them.
- the fat accumulated inside the engine promotes the heating of the motorcycle and the windings, and the same heating accelerates the decomposition of the fat, which becomes more viscous, increases the heating, generates vapors by its decomposition and causes the overall fouling of the windings and other internal parts of the motor, resulting in progressive deterioration by fouling, heating, degradation of the lubricant, more heating and more fouling, thereby reducing the duration of the average time between failures.
- JP 2004286080 of Hitoshi a system for recovering axially leaking oil is described, for which it uses flexible elements made of an oil-repellent material. These elements can fail or fail to fulfill their function if oils with high detergency characteristics or with additives that form high tenacity lubricant films are used, all of which nullify the oil repellency of the seal elements.
- the process mentioned in the present invention consists in the modification of electric motors, and more specifically for the application of mist lubrication, to seal the passage of air and lubricant between the bearing housing and the interior of the motor.
- the modification object of this procedure will provide additional support to the motor shaft or shaft that can prevent major damage due to a possible contact between the rotor and the motor stator or decrease The magnitude of such damages.
- said process includes the design, manufacture and installation of a high precision smooth cylindrical seal in the form of bushing or sleeve (below mentioned only as bushing) with an interior finish that does not allow the passage of oil mist inside the motor.
- the process object of this patent gives a long life to the bearings and therefore the average time between failures is improved, the application of the necessary amount of lubricant is controlled, the general life of the engine is prolonged because the temperature in its operation, the risk of catastrophic destruction of the engine is minimized, the risks of loss of production are reduced and in case of bearing failure the damage is not generalized and allows a specific repair.
- the present process includes a change in the direction and direction of flow of the lubricant to make it feed on the side of the bearing that faces the inside of the engine, flow through the balls or rollers and once used, exit on the side that it gives the engine outside towards a connection to the air, or to a purge collection system.
- the process consists of the following:
- First step A control inspection and maintenance procedure is performed to ensure the good condition of the engine.
- Second step the cover and the back cover of each end of the engine are modified to change the direction and direction of the flow of the lubricant to make it feed on the side of the bearing that faces the inside of the engine, then flow through the balls or rollers of the bearing and once used, exit from the side facing the outside of the engine, towards a connection to the air or to a purge collecting element or system.
- This step consists of enabling the hole of the arrow passage in each back cover to accommodate in each the seal in the form of a bushing made of a composite material, consisting of carbon fibers retained in a matrix of polytetrafluoroethylene fluorocarbon resin and install said bushing.
- This seal is made to the extent indicated with a tightening interference of 0.004 to 0.015 in. (The bushing must be mounted on the back cover under pressure). In this machining operation, the radial tolerance between the adjustment eyebrow of the back cover with the cap will be verified, and if it exceeds 0.002 in (0.051 mm), the eyebrow will be capped and machined again to achieve radial tolerance in order to achieve ensure concentricity.
- Fourth step It consists of verifying the bearing housing in the covers and machining to the extent required by the bearing if required (if it requires capping only use cast iron material to manufacture it).
- the next step is to dynamically balance the rotor, especially if the work area of the bearing is repaired with the addition of material.
- Seventh step It consists of assembling the engine in its entirety and installing the double lip and nitrile material seals on the outside of the covers, giving an adjustment between 0.001 to 0.015 in. (.00254 to 0.381 mm) maximum tightening with the arrow.
- the last step is to connect the engine to the mist lubrication system, and apply it in a minimum time of 30 minutes prior to the vacuum test.
- the points of entry and exit of the fog in the cover, both of the injection and of the drain will be at 06:00 and at 12:00 with respect to a clock face.
- the process includes the manufacture of the seal device object of the present invention integrated by a cylindrical bushing, which is used to seal the passage of air and lubricant between the bearing housing chambers and the interior of the engine, and more specifically, for the application of mist lubrication.
- Figure 1 shows a cut of the cover and back cover of a modified electric motor according to the present invention, representing the cover and back cover of the motor, the rotor with its arrow, the bearings, the composite seal and the inlet ports. and lubricant mist outlet.
- Figure 2 shows in detail the U-shaped cup retainer, mounted on the engine cover.
- Figure 3 shows the composite seal mounted on the engine back cover, and its relation to the motor arrow. DESCRIPTION OF THE PREFERRED MODES OF THE INVENTION
- the cylindrical seal or bushing 101 which is located inside the engine, should preferably be made of a composite material, consisting of carbon fibers retained in a fluorocarbon resin matrix of polytetrafluoroethylene, PTFE, preferably as manufactured by the DuPont company with the Vespel commercial.
- a material like this has many properties among which: it is a synthetically treated material with good hardness corresponding to a compressive strength of the order of 20 kpsi (140 MPa), low coefficient of thermal expansion (10 "6 m / m « ° C), high temperature limit (-46 ° to 230 ° C), chemical compatibility with hydrocarbons, high pressure-speed capacity, among others.
- the mentioned seal 101 must be manufactured with the following dimensions: with a length range 304 of 0.250 to 0.750 in (6.35 to 19.05 mm) and a radial tolerance 303 of + 0.0003 to +0.0015 in (+0.00762 to +0.0381 mm) between its inner diameter, and the diameter of the arrow 102 in the work area of the back cover 104, with a thickness of at least 0.2000 in (5.08 mm) 302.
- Said cylindrical bushing or seal 101 of non-metallic material, is fixed to the metal body of the back cover 104 by pressure and interference between the outer diameter of the bushing or seal 101 and inside of the back cover cavity 104 on the contact surface 301 with a setting of 0.004 to 0.015 in. (0.1016 to 0.381 mm) and preferably 0.008 to 0.012 in (0.2032 to 0.3048 mm) minimum interference
- the aforementioned cylindrical bushing or seal 101 must be complemented with a cup or retainer seal 105 type "V" or "U” of nitrile mounted on the cover 106 of the engine, to prevent the outflow of oil mist outwards;
- This seal or retainer will be smooth and without reinforcement spring, being able to be single or double lip, preferably double lip, thus forming an integral assembly with the modified back cover.
- the cup or retainer seal 105 has dimensions 201 and 202 according to the diameter of the arrow 102.
- the clear gap between the retainer 105 and the arrow 102 is represented as data 203 and will be between 0.010 to 0.020 in. (0.254 to 0.508 mm), and preferably from 0.011 to 0.015 in. (0.2794 to 0.381 mm) diametral maximum.
- the oil mist is fed by the port 109, flows back from the bearing 108, passes through it by lubricating and cooling it, reaches the housing chamber 107 of the bearing 108 and is finally discharged by the port 110 outwards, either to a container or a lubricant collection system for recovery
- the points of Fog inlet and outlet at the top, both of the injection and the drain is at 06:00 and 12:00 hours with respect to a clock face.
- a Second Modality of the present invention is that the Bushing or seal 101 is manufactured with an axial measurement 304 of greater length, reaching up to 1.5 in (38.1 mm), to give greater radial support in applications where the driven equipment imparts greater vibrations or axial loads to the arrow.
- a Third Modality of the present invention is that the bushing or seal 101 is made of composite materials with metal fibers or fillers, such as bronze alloys, babbitt, etc., retained in a PTFE matrix.
- a fourth embodiment of the present invention consists of in which the housing (or chamber) of housing 107 of the bearing 108 has an outlet port connected to a collecting system that prevents the emission of mist and liquid lubricant into the atmosphere, thus allowing its recovery.
- a fifth embodiment of the present invention is that the cup seal 105 type "V" or “U” of nitrite elastomer mounted on the engine cover, to prevent the outflow of oil mist outwards, is replaced by a ring of a composite material, consisting of carbon fibers retained in a matrix of polytetrafluoroethylene fluorocarbon resin, PTFE, similar to the inner seal 101.
- This ring of composite material consisting of carbon fibers retained in a matrix of fluorocarbon resin of Polytetrafluoroethylene, PFTE, has a radial tolerance, which will not exceed 0.010 in. (0.254mm).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Motor Or Generator Frames (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
- Sealing Devices (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112015009852A BR112015009852A2 (pt) | 2012-11-01 | 2012-11-01 | sistema e método para vedação de motores elétricos para aplicação de lubrificação por névoa |
US14/439,910 US20150295466A1 (en) | 2012-11-01 | 2012-11-01 | Method for sealing electric motors for the application of lubrication by mist |
PCT/MX2012/000109 WO2014069975A1 (es) | 2012-11-01 | 2012-11-01 | Proceso de sallado de motores eléctricos para la aplicación de lubricación por niebla |
MX2015003426A MX2015003426A (es) | 2012-11-01 | 2012-11-01 | Sistema y metodo para sellar motores electricos para la aplicacion de lubricación por nebulización. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/MX2012/000109 WO2014069975A1 (es) | 2012-11-01 | 2012-11-01 | Proceso de sallado de motores eléctricos para la aplicación de lubricación por niebla |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2014069975A1 true WO2014069975A1 (es) | 2014-05-08 |
WO2014069975A8 WO2014069975A8 (es) | 2015-06-04 |
Family
ID=50627772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/MX2012/000109 WO2014069975A1 (es) | 2012-11-01 | 2012-11-01 | Proceso de sallado de motores eléctricos para la aplicación de lubricación por niebla |
Country Status (3)
Country | Link |
---|---|
US (1) | US20150295466A1 (es) |
BR (1) | BR112015009852A2 (es) |
WO (1) | WO2014069975A1 (es) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022188139A1 (en) * | 2021-03-12 | 2022-09-15 | Shanghai Valeo Automotive Electrical Systems Co., Ltd. | Rotary electric machine for transmission system |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9889323B2 (en) * | 2013-03-13 | 2018-02-13 | The Boeing Company | Fire seal end cap and associated multi-member assembly and method |
CN108518482A (zh) * | 2018-06-11 | 2018-09-11 | 江苏港星方能超声洗净科技有限公司 | 异形真空槽的旋转密封结构 |
CN112751443A (zh) * | 2019-10-31 | 2021-05-04 | 中车株洲电力机车研究所有限公司 | 一种电机轴电压测试结构 |
CN111030354B (zh) * | 2019-12-10 | 2021-05-07 | 宁波上中下自动变速器有限公司 | 一种电机及车辆 |
US11421785B2 (en) * | 2020-01-30 | 2022-08-23 | Aktiebolaget Skf | Retainer for unitary seal assembly |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6008556A (en) * | 1995-05-03 | 1999-12-28 | Packaging Corporation Of America | Seal device for isolating bearing assemblies in a motor |
US6172436B1 (en) * | 1998-03-17 | 2001-01-09 | Reliance Electric Technologies, Llc | Seal arrangement for an electric motor |
JP2004286080A (ja) * | 2003-03-20 | 2004-10-14 | Mitsubishi Electric Corp | 電動機の軸受用潤滑油の封止構造 |
CN101216109A (zh) * | 2008-01-04 | 2008-07-09 | 洛阳轴研科技股份有限公司 | 一种使用在油雾润滑电主轴轴承的密封方法 |
-
2012
- 2012-11-01 US US14/439,910 patent/US20150295466A1/en not_active Abandoned
- 2012-11-01 WO PCT/MX2012/000109 patent/WO2014069975A1/es active Application Filing
- 2012-11-01 BR BR112015009852A patent/BR112015009852A2/pt not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6008556A (en) * | 1995-05-03 | 1999-12-28 | Packaging Corporation Of America | Seal device for isolating bearing assemblies in a motor |
US6172436B1 (en) * | 1998-03-17 | 2001-01-09 | Reliance Electric Technologies, Llc | Seal arrangement for an electric motor |
JP2004286080A (ja) * | 2003-03-20 | 2004-10-14 | Mitsubishi Electric Corp | 電動機の軸受用潤滑油の封止構造 |
CN101216109A (zh) * | 2008-01-04 | 2008-07-09 | 洛阳轴研科技股份有限公司 | 一种使用在油雾润滑电主轴轴承的密封方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022188139A1 (en) * | 2021-03-12 | 2022-09-15 | Shanghai Valeo Automotive Electrical Systems Co., Ltd. | Rotary electric machine for transmission system |
Also Published As
Publication number | Publication date |
---|---|
BR112015009852A2 (pt) | 2017-07-11 |
WO2014069975A8 (es) | 2015-06-04 |
US20150295466A1 (en) | 2015-10-15 |
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