GB2071427A - An Electrical Machine, Especially an Alternator for Motor Vehicles - Google Patents
An Electrical Machine, Especially an Alternator for Motor Vehicles Download PDFInfo
- Publication number
- GB2071427A GB2071427A GB8100439A GB8100439A GB2071427A GB 2071427 A GB2071427 A GB 2071427A GB 8100439 A GB8100439 A GB 8100439A GB 8100439 A GB8100439 A GB 8100439A GB 2071427 A GB2071427 A GB 2071427A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lubricant
- bearing
- roller bearing
- track ring
- machine
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure 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
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6607—Retaining the grease in or near the bearing
- F16C33/6611—Retaining the grease in or near the bearing in a porous or resinous body, e.g. a cage impregnated with the grease
-
- 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
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6622—Details of supply and/or removal of the grease, e.g. purging grease
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Rolling Contact Bearings (AREA)
Abstract
An electrical machine, especially an alternator for motor vehicles, is proposed, the rotor 12 of which is mounted in at least one roller bearing 30. The outer track ring 44 of the bearing consists of sintered steel and is impregnated with an oil as a lubricant. Moreover, a supply of lubricant (50) can be provided in the housing of the machine from which the lubricant can arrive at the periphery of the outer track ring 44 of the bearing under the action of centrifugal force. Due to the capillary action in the track ring 44 and its deformation occurring periodically during operation, the lubricant is transported to the bearing surface of the outer track ring 44 and from there is transported to the inner track ring of the bearing by the rollers 30. In that manner, used lubricant is continually replaced by fresh lubricant and the life of the bearing is increased. If necessary, the roller bearing can also be filled in the usual manner with a grease compatible with the lubricating oil. <IMAGE>
Description
SPECIFICATION
An Electrical Machine, Especially an Alternator for Motor Vehicles
State of the Art
The invention originates from a machine according to the preamble to the main claim. With the known machines of this kind, the roller bearings are filled with grease as a lubricant. The life of these bearings is limited by the fact that due to ageing and mechanical stress the grease is gradually used up and loses its iubricating properties until the bearing finally runs dry and seizes. It has been further proposed for lubricating roller bearings to provide radial bores in one or in both track rings of the bearings for supplying the lubricant, and to so arrange the bores that they issue into the zone of highest stress of the bearing surface, (German Specification 909 270).This arrangement has the disadvantage that the bearing surface of the track rings are interrupted many times by the bores for the lubricant just in the zone of the highest stress whereby the wear on the bearing is encouraged. With slide bearings, it is known to provide bearing shells of sintered metal which are surrounded by a supply of grease from which the lubricant reaches the sliding surface of the bearing through the capillary forces acting in the bearing shell (German AS 1137274).
Advantages of the Invention
As opposed to this, the arrangement in accordance with the invention comprising the characterising features of the main claim has the advantage that the bearing surface on the outer track ring of the roller bearing has no interruptions due to issuing lubricant bores and that, consequently, a more reliable lubrication is guaranteed by providing the lubricant, preferably oil, through the capillaries in the track ring. Both features contribute to the increase in the life of the roller bearing. The lubricant is also transmitted by the rollers to the inner track ring of the bearing so that special measures for its lubrication are not required.The reduction in strength of the outer track ring produced by the use of sintered steel does not affect the life of the roller bearing because lower surface pressures occur in any case at the outer track ring than at the inner track ring. The supply of lubricant to the outer bearing surface of the bearing is provided by the deformation which the outer track ring experiences during operation of the machine.
Thus, the previously known and used capillary effect in the sintered bearing material of slide bearings provided with substantially larger bearing surfaces can also be used with advantage for roller bearings wherein the lubricant attempts to reach the highest loaded zones of the bearing surfaces. Oil can preferably be used as a lubricant with which the outer track ring of the bearing is impregnated after sintering and finishing in a vacuum.
If necessary, the roller bearing can also be filled in the usual manner with a grease compatible with the lubricating oil.
Advantageous further developments of the arrangement set forth in the main claim are made possible by the measures set forth in the subclaims.
The lubricant storage can be increased if an annular chamber filled with lubricant is provided between the bore in the fixed part of the machine receiving the roller bearing and the outer track ring of the roller bearing, the annular chamber preferably being formed by an annular groove in the bore.
It is of particular advantage when this annular chamber is in communication with a supply of lubricant from which the lubricant arrives at least substantially over the entire periphery of the outer roller bearing track ring under the influence of centrifugal force.
Drawing
An embodiment of the invention is illustrated in the drawing and is described in detail in the following specification. The single figure shows an alternator of claw pole construction for motor vehicles in longitudinal section.
Description of the Embodiment
The generator has a housing 10, in which a rotor 12 is rotatably mounted, made up of two half shells. The rotor 12 has a shaft 14 onto which are forced a pole core 1 6 and two claw pole wheels 1 8 and 20. An energising winding 22 which is connected by conductors 24 and 26 to the slip rings (not visible in the drawing) is mounted on the pole core 16. The rotor 12 is surrounded externally by a stator 28 which is rigidly clamped between the two half shells of the housing 10.
The shaft 14 is mounted at one end in a ball bearing 30 which is mounted in a bore 32 in the housing and is rigidly clamped in the bore by screws 34 through an annular member 36 sealing the interior of the housing. Bushes 38 and 40 are arranged on the shaft 14 on both sides of the ball bearing 30, which ensure the mutual position of the parts by mounting a V-belt pulley on the shaft 14 with the aid of the nut 42.
The ball bearing 30 has an outer track ring 44 which consists of sintered steel, especially sintered ball bearing steel, and is impregnated in a vacuum with oil as a lubricant. An annular groove 46 is provided in the bore 32 and is connected through a radially upwardly extending duct 48 to a bore 50 of larger diameter. This serves as a supply of lubricant and can be filled at the top through an opening which can be closed by a threaded plug 52. Under the influence of centrifugal force, the lubricant runs into the annular groove 46 from whence it arrives at the bearing surface of the track ring 44 and from there through the ball to the bearing surface of the inner ball bearing ring, through the capillary affect and through the deformation of the track ring 44 occurring periodically during operation.
The ball bearing 30 is protected on each side against the ingress of dust and dirt by two discs 54.
Claims (6)
1. An electrical machine, especially an alternator for motor vehicles, comprising a rotor the shaft of which Is mounted in at least one roller bearing the outer ring of which is mounted in a bore in a fixed part of the machine, characterised in that, the outer ring of the roller bearing consists of sintered steel, preferably roller bearing steel, and is impregnated with a lubricant.
2. A machine according to claim 1 characterised in that an annular chamber filled with lubricant is formed between the bore in the fixed part of the machine receiving the roller bearing and the outer track ring of the roller bearing, preferably in the axiai central plane of the roller bearing.
3. A machine according to claim 2 characterised in that the annular chamber filled with lubricant is formed by an annular groove in the bore in the fixed part of the machine.
4. A machine according to claim 2 or 3 characterised in that the annular chamber filled with lubricant is in communication with a supply of lubricant.
5. A machine according to claim 4 characterised in that the supply of lubricant is formed by a bore in the housing of the machine which is so arranged with respect to the roller bearing that the lubricant arrives at least substantially at the entire periphery of the outer track ring under the action of centrifugal force.
6. An electrical machine substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803004429 DE3004429A1 (en) | 1980-02-07 | 1980-02-07 | ELECTRIC MACHINE, ESPECIALLY THREE-PHASE GENERATOR FOR MOTOR VEHICLES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2071427A true GB2071427A (en) | 1981-09-16 |
| GB2071427B GB2071427B (en) | 1984-01-25 |
Family
ID=6093947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8100439A Expired GB2071427B (en) | 1980-02-07 | 1981-01-08 | Electrical machine especially an alternator for motor vehicles |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS56123754A (en) |
| DE (1) | DE3004429A1 (en) |
| GB (1) | GB2071427B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0511026A1 (en) * | 1991-04-26 | 1992-10-28 | Mabuchi Motor Kabushiki Kaisha | Motor driven pump |
| US6599066B1 (en) * | 1999-10-26 | 2003-07-29 | Makino Milling Machine Co., Ltd. | Rotating shaft device and machine tool |
| ES2400097A1 (en) * | 2010-10-05 | 2013-04-05 | Golderos, S.A. | Electric motor for heat exchanger machines. (Machine-translation by Google Translate, not legally binding) |
| CN104838157A (en) * | 2012-12-14 | 2015-08-12 | 维斯塔斯风力系统有限公司 | Rotating electrical machine having improved bearing lubrication and associated methods |
-
1980
- 1980-02-07 DE DE19803004429 patent/DE3004429A1/en not_active Withdrawn
-
1981
- 1981-01-08 GB GB8100439A patent/GB2071427B/en not_active Expired
- 1981-02-06 JP JP1588481A patent/JPS56123754A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0511026A1 (en) * | 1991-04-26 | 1992-10-28 | Mabuchi Motor Kabushiki Kaisha | Motor driven pump |
| US6599066B1 (en) * | 1999-10-26 | 2003-07-29 | Makino Milling Machine Co., Ltd. | Rotating shaft device and machine tool |
| ES2400097A1 (en) * | 2010-10-05 | 2013-04-05 | Golderos, S.A. | Electric motor for heat exchanger machines. (Machine-translation by Google Translate, not legally binding) |
| CN104838157A (en) * | 2012-12-14 | 2015-08-12 | 维斯塔斯风力系统有限公司 | Rotating electrical machine having improved bearing lubrication and associated methods |
| CN104838157B (en) * | 2012-12-14 | 2017-03-15 | 维斯塔斯风力系统有限公司 | Having improves the electric rotating machine and its correlation technique of bearing lubrication |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56123754A (en) | 1981-09-29 |
| GB2071427B (en) | 1984-01-25 |
| DE3004429A1 (en) | 1981-08-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |