WO2014009998A1 - 回転電機 - Google Patents
回転電機 Download PDFInfo
- Publication number
- WO2014009998A1 WO2014009998A1 PCT/JP2012/004480 JP2012004480W WO2014009998A1 WO 2014009998 A1 WO2014009998 A1 WO 2014009998A1 JP 2012004480 W JP2012004480 W JP 2012004480W WO 2014009998 A1 WO2014009998 A1 WO 2014009998A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bearing
- spacer
- outer ring
- bearing housing
- machine according
- Prior art date
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Classifications
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- 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
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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- 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
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- 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
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/04—Ball or roller bearings, e.g. with resilient rolling bodies
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- 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
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
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- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
- F16C19/525—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to temperature and heat, e.g. insulation
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- 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
- F16C2208/70—Polyesters, e.g. polyethylene-terephthlate [PET], polybutylene-terephthlate [PBT]
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- 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
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/50—Positive connections
-
- 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 rotating electrical machine such as an AC generator mounted on a vehicle, for example, and relates to a rotating electrical machine in which a bearing that supports a rotor is housed in a bearing housing portion of a bracket.
- a drive side bearing and a counter drive side bearing are provided on both sides of a shaft to support a rotor, and the drive side bearing is directly press-fitted into the drive side bracket and the retainer is screwed. It is fixed to the drive side bracket by fastening, and the non-drive side bearing is not fixed to the anti-drive side bracket by using the retainer.
- a resin spacer is provided between the bearing housing part of the non-driving side bracket and the bearing outer ring so that the outer ring of the bearing is in the bearing housing part. On the other hand, the rotation is prevented by the spacer.
- the resin spacer for preventing the rotation of the outer ring of the bearing is not press-fitted at room temperature between the bearing housing and the outer ring of the bearing, and a small amount of gap is provided.
- a resin spacer When a resin spacer is attached, a general aluminum bracket will be permanently deformed due to the continued high temperature condition, and the inner diameter of the bearing housing will increase, resulting in the inner surface of the resin spacer being the outer ring of the bearing.
- the thermal expansion is greater than the outer peripheral surface of the bearing, and a gap is formed between the inner peripheral surface of the resin spacer and the outer peripheral surface of the bearing outer ring, so that the rotation of the outer ring of the bearing cannot be prevented.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine that can reliably prevent rotation of a bearing outer ring and prevent damage to a bearing and a bearing housing portion. .
- a rotating electrical machine includes a shaft, a rotor fixed to the shaft, a bearing that is rotatably provided on both sides of the rotor and supports the rotor, A resin having a bearing housing portion on which a bearing is mounted, a bracket that rotatably supports the rotor via the bearing, and an outer ring outer periphery of the bearing and an inner periphery of the bearing storage portion And a spacer having a radial thickness that is set to be smaller than a clearance between the outer periphery of the bearing outer ring and the inner periphery of the bearing housing portion, and at least one of the spacers on the entire periphery.
- a flat portion is provided at the periphery, and the flat portion is configured to always press the outer periphery of the bearing outer ring.
- the flat portion provided on the inner periphery of the spacer is configured to always press the outer periphery of the bearing outer ring, the bearing outer ring caused by heat generation during driving of the rotating electrical machine and Relative rotation with the spacer can be prevented, and damage to the bearing and the bearing housing portion can be prevented. Therefore, since it is not necessary to use a special bearing, the cost can be reduced, and since the outer ring of this bearing does not rotate between the spacers, the durability of the device can be improved and the reliability can be improved. Can do.
- the bearing outer ring is pressed and prevented from rotating by a flat part provided partially on the circumference of the spacer, even if the temperature becomes high, the bearing function associated with the application of stress inside the bearing is hindered. It can be done without coming.
- FIG. 1 It is a sectional side view which shows the vehicle alternator which concerns on Embodiment 1 of this invention. It is a perspective view which shows the cylindrical spacer of FIG. It is sectional drawing which shows the spacer of FIG. It is a fragmentary perspective view which shows the inner side of the bearing accommodating part of FIG. It is a partial expanded sectional view which shows the structure of the bearing accommodating part of the bracket of the alternating current generator for vehicles shown in FIG. 1, a spacer, and a bearing outer ring. It is sectional drawing which shows the spacer of the alternating current generator for vehicles which concerns on Embodiment 2 of this invention. It is a fragmentary sectional view which shows the mounting state of the spacer shown in FIG. It is sectional drawing which shows the spacer of the alternating current generator for vehicles which concerns on Embodiment 3 of this invention.
- FIG. 1 is a side sectional view showing an automotive alternator according to Embodiment 1 of the present invention
- FIG. 2 is a perspective view showing a cylindrical spacer in FIG. 1
- FIG. 3 is a sectional view showing the spacer in FIG. 4 is a partial perspective view showing the inside of the bearing housing portion of FIG. 1
- FIG. 5 is a partially enlarged view showing the structure of the bearing housing portion, spacer, and bearing outer ring of the bracket of the vehicle alternator shown in FIG. It is sectional drawing.
- This vehicle alternator (hereinafter abbreviated as “generator”) includes a case composed of a drive side bracket 1 and a counter drive side bracket 2, a resin cover 18 covering the entire surface of the counter drive side bracket 2, A shaft 4 provided on the inner side and having a pulley 3 attached to one end thereof, a rotor 5 attached to the shaft 4, a driving side fan 6 attached to the driving side bracket 1 side of the rotor 5, and a counter driving And a non-driving side fan 7 attached to the side bracket 2 side. Further, the generator includes a slip ring 8 attached to the shaft 4 for supplying current to the rotor 5, a pair of brushes 9 that slide on the slip ring 8, the drive side bracket 1 and the counter drive side.
- a stator 10 fixed to the bracket 2 a rectifier 11 that is electrically connected to the stator 10 and rectifies an alternating current generated in the stator 10 into a direct current, and an alternating voltage generated in the stator 10 is adjusted. And a regulator 12 is provided.
- the rotor 5 has a pair of claw-shaped magnetic poles 13 and 14 opposed to each other and a rotor coil 15 in which a conducting wire is wound inside the claw-shaped magnetic poles 13 and 14.
- the stator 10 includes a stator core 16 and a stator coil 17 in which a conductive wire is wound around a slot (not shown) of the stator core 16.
- the stator coil 17 is composed of two three-phase AC windings in which three winding portions (not shown) are connected in a three-phase Y-shape.
- the drive-side bracket 1 and the counter-drive-side bracket 2 are made of aluminum and formed in a bowl shape, and are integrated by fastening the respective bowl-shaped openings with fastening bolts 19 facing each other.
- the drive side bracket 1 is formed with a bearing housing portion 20 at the center.
- a drive side bearing 21 that rotatably supports the shaft 4 is press-fitted and accommodated in the bearing accommodating portion 20.
- the drive side bearing 21 is fixed to the drive side bracket 1 by fastening a retainer 40 with a screw 41.
- the counter drive side bracket 2 is formed with a bearing storage portion 22 at the center.
- a non-driving side bearing 23 that rotatably supports the shaft 4 is mounted on the bearing housing portion 22 via a cylindrical spacer 24 made of resin.
- the non-driving side bearing 23 includes an inner ring 23a fixed to the shaft 4, an outer ring 23b fixed in the bearing housing 22 via a spacer 24, and a ball 23c mounted between the outer ring 23b and the inner ring 23a. It consists of.
- the spacer 24 is formed between the bearing housing portion 22 and the outer ring 23b of the non-driving side bearing 23 caused by a difference in thermal expansion between the bearing housing portion 22 and the outer ring 23b of the non-driving side bearing 23 due to heat generation during driving.
- the gap is complemented by thermal expansion.
- the spacer 24 shown in FIG. 2 has a cylindrical shape covering the entire length in the axial direction of the outer ring 23b of the counter driving side bearing 23, and is made of polybutylene terephthalate (PoBT) resin.
- the spacer 24 is formed with a locking portion 25 over the entire circumference at the edge opposite to the rotor 5.
- the locking portion 25 protrudes from the spacer body 26 in the radially inner direction.
- two ribs 27 are formed on the outer peripheral surface of the spacer body 26 so as to extend over the entire width in the axial direction.
- the flat portion 29 has an inner peripheral surface 29b formed in a string shape on the inner periphery of the spacer 24, and has a dimension e (for example, 0) so as to always press the outer peripheral surface of the bearing outer ring 23b at room temperature. .065 mm) is set. Further, at normal temperature, the clearance f (for example, 0.025 mm) is set between the outer peripheral surface of the bearing outer ring 23 b excluding the flat portion 29 and the inner peripheral surface of the spacer 24. The values of the dimension e and the clearance f are set so that only the inner peripheral surface of the flat portion 29 always presses the outer peripheral surface of the bearing outer ring 23b and functions as a detent for the bearing outer ring 23b even when the high temperature state continues. Is set.
- two ribs 27 are formed integrally with the spacer 24 through the slit 28.
- Engagement recesses 30 formed in the bearing housing portion 22 are formed in the radially opposing portion of the flat portion 29, and the ribs 27 are engaged to prevent the spacer 24 from rotating.
- the gap g between the rib 27 and the side wall of the engaging recess 30 is set to 0.2 mm, for example, and the gap h between the rib 27 and the outer peripheral wall of the engaging recess 30 is set to 0.39 mm, for example. Yes.
- the dimension of the gap h is set to a value at which the outer peripheral surface of each rib 27 does not contact the inner peripheral surface of the engaging recess 30 of the bearing housing portion 22 even when the high temperature state continues. Further, a gap i between the outer peripheral surface of the spacer 24 excluding the flat portion outer peripheral surface 29a in the spacer 24 and the inner peripheral surface of the bearing housing portion 22 is set to 0.014 mm, for example.
- the outer diameter of the outer ring 23b of the bearing 23 is set to 35 mm
- the inner diameter of the spacer 24 is set to 35.05 mm
- the outer diameter of the spacer 24 is set to 37.01 mm
- the inner diameter of the bearing housing portion 22 of the bracket 2 is set to 37.038 mm.
- the gap f is set to 0.025 mm and the gap i is set to 0.014 mm as described above.
- FIG. 4 is a partial perspective view of the bearing housing portion 22 of the non-driving side bracket 2 as viewed from the inside.
- the bearing housing portion 22 includes a flange portion 31 through which the shaft 4 passes, a taper portion 32 with which the locking portion 25 of the spacer 24 is engaged, and an engagement portion 33 with which the tip of the rib 28 of the spacer 24 is engaged. Is formed.
- a tip end portion is connected to the engaging portion 33, and a rib storage portion 34 extending in the axial direction is formed.
- a notch 35 is formed.
- a current is supplied from a battery (not shown) to the rotor coil 15 of the rotor 5 through the brush 9 and the slip ring 8 to generate a magnetic flux.
- 14 has N and S poles, respectively.
- the pulley 3 is driven by the engine and the rotor 5 is rotated by the shaft 4, a rotating magnetic field is applied to the stator core 16, and an electromotive force is generated in the stator coil 17.
- the magnitude of the AC electromotive force is adjusted by a regulator 12 that adjusts the current flowing through the rotor coil 15.
- the alternating current generated by the alternating electromotive force is rectified to direct current through the rectifier 11 and charged to the battery.
- the non-driving side bearing 23 is accommodated in the bearing accommodating portion 22 of the non-driving side bracket 2 in which the rectifier 11 and the regulator 12 which are heat generating components are disposed. Therefore, heat generated in the heat generating component is transmitted to the non-driving side bearing 23 through the bearing housing portion 22 on the non-driving side, and heat generated in the rotor coil 15 is transmitted through the claw-shaped magnetic poles 13 and 14 to the shaft. 4, this heat is transmitted to the outer ring 23b of the non-driving side bearing 23, and the bearing housing 22, the spacer 24, and the outer ring 23b of the non-driving side bearing 23 are thermally expanded.
- the bearing housing portion 22 is made of aluminum and the outer ring 23b of the non-driving side bearing 23 is made of carbon steel, the gap between the bearing housing portion 22 and the outer ring 23b of the counter driving side bearing 23 is small. Thermal expansion to increase.
- the linear expansion coefficient of the spacer 24 is large, the spacer 24 is thermally expanded so as to complement the increment of the gap between the bearing housing portion 22 and the outer ring 23b of the non-driving side bearing 23. The connecting force between the outer ring 23b and the outer ring 23b is ensured.
- the inner peripheral surface 29b of the flat portion 29 of the spacer 24 receives heat from the heat-generating component and continues to press the bearing outer ring 23b at three locations on the entire periphery even when the high temperature state occurs. Relative rotation with the bearing outer ring 23b does not occur. Further, the ribs 27 of the spacer 24 also thermally expand at a high temperature and thermally expand to the outer circumferential side and the circumferential side, but the ribs 27 do not come into pressure contact with the inner circumferential surface of the bearing housing portion 22. A dimension g and a dimension h are set.
- Each rib 27 passes through a predetermined minute gap from the circumferential inner surface of the bearing housing portion 22, and as a result, the rib 27 of the spacer 24 is a bearing on the opposite side to the rotation direction when the shaft 4 rotates.
- the spacer 24 abuts against the inner surface in the circumferential direction to prevent the spacer 24 from rotating with respect to the bearing storage portion 22.
- the rib 27 on the side where the annular locking portion 25 is formed is connected to the notch portion of the bearing housing portion 22.
- the rib 27 is inserted into the rib accommodating portion 34 through 35, the tip of the rib 27 is engaged with the engaging portion 33, and the engaging portion 25 of the spacer 24 is pressed against the tapered portion 32. Attach so that it contacts.
- the ribs 27 are each provided with three pairs of ribs 27 at every 120 ° on the circumference, and are stored in the bearing storage portion 22 at the same time, so that assembly is extremely easy and workability is improved. To do.
- the spacer 24 holds the outer ring 23b and the spacer of the bearing 23 even when the bearing 23 is assembled at the normal temperature. Since the rotation is prevented, the assembling work is facilitated.
- the ribs 27 provided on the spacer 24 are in pairs, and the slits 28 are provided between the ribs 27, the circumferential thickness of the ribs 27 can be reduced, and the resin material of the spacer 24 can be reduced. Can prevent the shrinkage phenomenon caused by thermal contraction at high temperature, and as a result, the thickness of the flat portion 29 of the spacer 24 can be made uniform in thickness in the radial direction, and the function of the spacer 24 can be exhibited more definitely.
- the ribs 27 provided on the spacer 24 do not need to be formed over the entire width of the spacer 24 in the axial direction, and the outer peripheral portion of the spacer 24 protrudes and engages with the concave portion 30 of the bearing housing portion 22 to rotate each other. A part of the full axial width may be provided to prevent this.
- One rib 27 may be provided on the flat portion 29.
- FIG. 6 is a cross-sectional view showing a spacer 24 of an automotive alternator according to Embodiment 2 of the present invention, and FIG.
- a convex portion 36 that can be always press-fitted into the inner peripheral surface of the bearing housing portion 22 at normal temperature is formed on the outer peripheral surface in the circumferential central portion of the rib 27 mounting portion of the spacer 24.
- three convex portions 36 are formed at equal intervals of 120 ° (angle ⁇ ) on the circumference of the outer peripheral surface of the spacer 24 and at the center positions of the pair of ribs 27 mounting portions. .
- These convex portions 36 are formed integrally with the spacer 24, press the inner peripheral surface of the bearing housing portion 22 as shown in FIG.
- the convex portion 36 on the outer peripheral surface of the spacer 24 Presses the inner peripheral surface of the bearing housing portion 22 to prevent the spacer 24 and the bearing housing portion 22 from rotating.
- the flat portion 29b formed on the inner peripheral surface of the spacer 24 is configured to press the outer peripheral surface of the bearing outer ring 23b with a predetermined pressing force at both normal temperature and high temperature.
- the spacer 24 is prevented from rotating with respect to the bearing outer ring 23b and the bearing housing portion 22 by the flat inner peripheral surface 29b on the inner peripheral surface and the convex portion 36 on the outer peripheral surface.
- the bearing outer ring 23 and the bearing housing portion 22 in the spacer 24 can be reliably prevented from rotating.
- the flat portion 29 and the convex portion 36 provided on the spacer 24 are provided on the inner peripheral surface and the outer peripheral surface of the spacer 24 so as to be equally spaced on the circumference of the spacer 24, respectively.
- the spacer 24 can exhibit a function to prevent the rotation of the spacer 24 in a well-balanced manner, and can ensure an anti-rotation operation and provide a device with good durability.
- FIG. 8 is a cross-sectional view showing a spacer 24 for an automotive alternator according to Embodiment 3 of the present invention.
- the spacer 24 is formed only with a flat portion 29 that presses the outer peripheral surface of the bearing outer ring 23b and prevents rotation with respect to the bearing outer ring 23b, both at room temperature and at a high temperature.
- the rib 27 and the convex portion 36 are not provided. That is, in this embodiment, by providing the flat portion 29 on the spacer 24, the bearing outer ring 23b can always be pressed, and the rotation between the spacer 24 and the bearing outer ring 23b can be prevented especially at a high temperature.
- the bearing outer ring 23b and the spacer 24 can be prevented from rotating relative to each other due to heat generated when the AC generator is driven, and the function of the bearing is deteriorated due to the entire inner peripheral surface of the spacer 24 pressing the bearing outer ring 23b as in the prior art. Can be prevented.
- the inner peripheral surface 29c of the flat portion 29 of the spacer 4 is illustrated as being formed like a string.
- the present invention is not limited to this, and the bearing outer ring 23b is pressed. Any other shape may be used as long as it has a detent function.
- an AC generator applied to an AC generator for a vehicle has been described.
- the present invention is not limited to this, and the present invention can be applied to an AC generator for an outboard motor, for example. Can be applied. It can also be applied to an electric motor. Further, the present invention can also be applied to a motor generator that uses both a motor and a generator.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
Description
従って、特殊な軸受を用いる必要がないので低コスト化が図れ、また、この軸受けの外輪は、スペーサとの間で回転することがないので、装置の耐久性を向上でき、信頼性を高めることができる。また、スペーサの円周上、部分的に設けられた平坦部により、軸受外輪を押圧して回転防止しているので、高温状態となっても、軸受内部の応力印加に伴う軸受機能に支障を来たすこともなくし得る。
図1は本発明の実施の形態1に係る車両用交流発電機を示す側断面図、図2は、図1の円筒状スペーサを示す斜視図、図3は、図1のスペーサを示す断面図、図4は、図1の軸受収納部の内側を示す部分斜視図、図5は、図1に示す車両用交流発電機のブラケットの軸受収納部と、スペーサ及び軸受外輪の構成を示す部分拡大断面図である。
この車両用交流発電機(以下、発電機と略称する。)は、駆動側ブラケット1及び反駆動側ブラケット2からなるケースと、反駆動側ブラケット2の全面を覆った樹脂カバー18と、ケースの内側に設けられ、一端にプーリ3が取り付けられたシャフト4と、このシャフト4に取り付けられた回転子5と、この回転子5の駆動側ブラケット1側に取り付けられた駆動側ファン6及び反駆動側ブラケット2側に取り付けられた反駆動側ファン7とを備えている。
また、この発電機は、シャフト4に取り付けられた、回転子5に電流を供給するためのスリップリング8と、スリップリング8に摺動する一対のブラシ9と、駆動側ブラケット1及び反駆動側ブラケット2に固定された固定子10と、固定子10に電気的に接続され、固定子10で生じた交流電流を直流電流に整流するレクチファイヤ11と、固定子10で生じた交流電圧を調整するレギュレータ12とを備えている。
固定子10は、固定子鉄心16と、固定子鉄心16のスロット(図示せず)に導線が巻回された固定子コイル17とを有している。固定子コイル17は、3個の巻線部(図示せず)を3相Y形結線した2つの3相交流巻線により構成されている。
駆動側ブラケット1には、中央部に軸受収納部20が形成されている。この軸受収納部20には、シャフト4を回転自在に支持した駆動側軸受21が圧入して収納されている。この駆動側軸受21は、リテイナ40をねじ41で締結することで駆動側ブラケット1に固定されている。
反駆動側ブラケット2には、中央部に軸受け収納部22が形成されている。この軸受収納部22には、シャフト4を回転自在に支持した反駆動側軸受23が樹脂製の円筒状スペーサ24を介して装着されている。反駆動側軸受23は、シャフト4に固着された内輪23aと、軸受収納部22内にスペーサ24を介して固定された外輪23bと、この外輪23bと内輪23aとの間に装着されたボール23cとからなる。
このスペーサ24は、駆動時の発熱に起因する軸受収納部22及び反駆動側軸受23の外輪23bの熱膨張差により生じた、軸受収納部22と反駆動側軸受23の外輪23bとの間の隙間を熱膨張により補完するものである。
また、このスペーサ24は、回転子5と反対側の縁部に全周に亘って係止部25が形成されている。この係止部25は、スペーサ本体26から径内側方向に突出している。
また、スペーサ本体26の外周面に、軸線方向にその全幅に亘って延びて形成された2個のリブ27が形成されている。
2個のリブ27の間には、リブ27の幅と同一の寸法a(a=0.8mm)のスリット28が設けられている。
また、リブ27が形成されるスペーサ24の円周上の3ヶ所には平坦部29が形成されており、この平坦部29に、一対のリブ27が突出して一体形成されて径方向の肉厚dは、0.98mmに設定されている。
この平坦部29は、その内周面29bは、スペーサ24の内周に弦形状を成す様に構成されており、常温において、常に軸受外輪23bの外周面を押圧する様に寸法e(例えば0.065mm)が設定されている。また、常温において、平坦部29を除く軸受外輪23bの外周面とスペーサ24の内周面との間の隙間f(例えば0.025mm)に設定されている。前記の寸法eおよび隙間fの値は、高温状態が続いても、常に平坦部29の内周面のみが軸受外輪23bの外周面を押圧して、軸受外輪23bの回り止め機能を成すように設定されている。
その平坦部29の径方向対向部には、軸受収納部22に形成された係合凹部30が形成されており、リブ27を係合することにより、スペーサ24の回転を阻止している。なお、リブ27と係合凹部30の側壁との隙間gは例えば0.2mmに設定されており、リブ27と係合凹部30の外周壁との隙間hは、例えば0.39mmに設定されている。この隙間hの寸法は、高温状態が続いても、各リブ27の外周面が軸受収納部22の係合凹部30の内周面に当接しない値に設定されている。
また、スペーサ24における平坦部外周面29aを除くスペーサ24の外周面と軸受収納部22の内周面との隙間iは例えば0.014mmに設定されている。
従って、前記のように隙間f=0.025mm、隙間i=0.014mmに設定されている。
この軸受収納部22は、シャフト4が貫通するつば部31に、スペーサ24の係止部25が係合されるテーパ部32と、スペーサ24のリブ28の先端が係合される係合部33が形成されている。
軸受収納部22の内周面には、先端部が係合部33に接続され、軸線方向に延びたリブ収納部34が形成され、このリブ収納部34の入口部には、テーパ状の切欠き部35が形成されている。
一方、エンジンによってプーリ3は駆動され、シャフト4によって回転子5が回転するため、固定子鉄心16には回転磁界が与えられ、固定子コイル17には起電力が生じる。
この交流の起電力は、回転子コイル15に流れる電流を調整するレギュレータ12によりその大きさが調整される。
また、この交流の起電力により生じる交流は、レクチファイヤ11を通って直流に整流されてバッテリに充電される。
そのため、発熱部品で発生した熱が反駆動側の軸受収納部22を介して反駆動側軸受23に伝達され、また、回転子コイル15で発生した熱が爪状磁極13,14を介してシャフト4に伝わり、この熱が反駆動側軸受23の外輪23bに伝達され、軸受収納部22、スペーサ24および反駆動側軸受23の外輪23bが熱膨張する。
このとき、軸受収納部22がアルミニウムで作製されており、反駆動側軸受23の外輪23bが炭素鋼で作製されているので、軸受収納部22と反駆動側軸受23の外輪23bとの間隙が大きくなるように熱膨張する。
一方、スペーサ24の線膨張率が大きいことから軸受収納部22と反駆動側軸受23の外輪23bとの間隙の増分を補完するように熱膨張するので、軸受収納部22と反駆動側軸受23の外輪23bとの間のスペーサ24を介しての結合力は確保される。
また、スペーサ24のリブ27も高温時には熱膨張し、外周方向側および円周方向側へ熱膨張するが、その各リブ27が軸受収納部22の内周面と圧接することがないように、寸法gと寸法hが各々設定されている。
各リブ27は、軸受収納部22の周方向内面とは、所定の微小間隙を介すこととなり、その結果、スペーサ24のリブ27は、シャフト4の回転時にはその回転方向への対向側の軸受収納部22の周方向内面と当接してスペーサ24の軸受収納部22に対する回転を阻止している。
リブ27は、各1対のリブ27がその円周上120°毎に3ヶ所設けられており、各々同時に軸受収納部22に収納されるので、組付けが極めて容易に出来、作業性が向上する。
図6は、この発明の実施の形態2の車両用交流発電機のスペーサ24を示す断面図、図7は、図6の要部拡大断面図である。
この実施の形態では、スペーサ24におけるリブ27装着部の円周方向中央部外周面に、常温で常に軸受収納部22の内周面に圧入し得る凸部36が形成されている。この凸部36は、図6に示すように、スペーサ24の外周面の円周上120°等間隔(角度α)でかつ、一対のリブ27装着部の中央位置に各々3個形成されている。これら凸部36は、スペーサ24と一体に形成されており、常温時には図7に示す如く軸受収納部22の内周面を押圧すると共に、高温状態時にも、スペーサ24の外周面の凸部36は、軸受収納部22の内周面を押圧して、スペーサ24と軸受収納部22との回転を阻止している。また、スペーサ24の内周面に形成された平坦部29bが軸受外輪23bの外周面を、常温時にも、高温時にも所定の押圧力で押圧するように構成されている。
更に、スペーサ24に設けられた平坦部29と凸部36は、スペーサ24の円周上、各々等間隔となるように、スペーサ24の内周面と外周面とに各々設けられているので、スペーサ24をバランスよく回り止め機能を発揮出来、回転防止動作を確実にして、耐久性の良好な装置を提供し得る。
図8は、この発明の実施の形態3の車両用交流発電機のスペーサ24を示す断面図である。
この実施の形態では、スペーサ24には、常温時にも、高温状態時にも、軸受外輪23b外周面を押圧して、軸受外輪23bに対して回転防止を行う平坦部29のみが形成されている。前述の実施の形態1および2の如くリブ27、および凸部36は設けられていない。
即ち、この実施の形態のものでは、スペーサ24に平坦部29を設けることにより、常に軸受外輪23bを押圧して、特に高温状態時におけるスペーサ24と軸受外輪23bとの間の回転を防止出来るので、交流発電機の駆動時の発熱に起因する軸受外輪23bとスペーサ24との相対回転を防止出来ると共に、従来の如くスペーサ24の内周面全体が軸受外輪23bを押圧することによる軸受の機能低下を防止出来る。
また、電動機にも適用することができる。
また、電動機と発電機を兼用した電動発電機にも適用することができる。
1 駆動側ブラケット、2 反駆動側ブラケット、3 プーリ、4 シャフト、5 回転子、6 駆動側ファン、7 反駆動側ファン、8 スリップリング、9 ブラシ、10 固定子、11 レクチファイヤ、12 レギュレータ、13,14 爪状磁極、15 回転子コイル、16 固定子鉄心、17 固定子コイル、18 樹脂カバー、19 締付ボルト、20,22 軸受収納部、21 駆動側軸受、23 反駆動側軸受、23a 内輪、23b 外輪、23c ボール、24 スペーサ、25 係止部、26 スペーサ本体、27 リブ、28 スリット、29 平坦部、29a 外周面、29b 内周面、 30 係合凹部、31 つば部、32 テーパ部、33 係合部、34 リブ収納部、 35 切欠き部、36 凸部。
Claims (10)
- シャフトと、このシャフトに固定された回転子と、この回転子の両側であって前記シャフトに回転自在に設けられていると共に前記回転子を支持した軸受と、この軸受が装着された軸受収納部を有し、前記軸受を介して前記回転子を回転自在に支持するブラケットと、前記軸受の外輪外周と前記軸受収納部の内周との間に装着された樹脂製の円筒状スペーサとを備え、
前記スペーサは、その径方向肉厚が、前記軸受外輪外周と前記軸受収納部内周との間隙よりも小さく設定され、かつ、全周上の少なくとも1ヶ所の内周において、平坦部が設けられ、この平坦部が前記軸受外輪の外周を常に押圧するように構成されていることを特徴とする回転電機。 - 前記平坦部は、円周上複数設けられていることを特徴とする請求項1に記載の回転電機。
- 前記平坦部は、円周上均等に配置されていることを特徴とする請求項2に記載の回転電機。
- 前記平坦部は、スペーサの内周に弦形状を成すように構成されていることを特徴とする請求項1乃至3のいずれか1項に記載の回転電機。
- 前記平坦部を有するスペーサは、前記平坦部の外周にリブを設けると共に、前記軸受収納部には、前記リブを収納する凹部を設け、この凹部内周と前記リブの外周との隙間は前記スペーサが熱膨張しても前記リブが前記凹部に当接しないように設定されていることを特徴する請求項1乃至4のいずれか1項に記載の回転電機。
- 前記リブが設けられているスペーサ外周は平坦部から成ることを特徴とする請求項5に記載の回転電機。
- 前記リブは、周方向にスリットを介して2個1対で設けられていることを特徴とする請求項5または6に記載の回転電機。
- 前記リブは、前記スペーサの軸方向外周の全幅に亘って形成されていることを特徴とする請求項5乃至7のいずれか1項に記載の回転電機。
- スペーサの外周の少なくとも円周上の1ヶ所に、前記軸受収納部内周に常に圧入し得る凸部を設けたことを特徴とする請求項1乃至8のいずれか1項に記載の回転電機。
- スペーサに設けられた平坦部は円周上均等に3ヶ所に設けられ、かつ前記スペーサに設けられた凸部は前記隣接する平坦部間の中央の位置に各々3ヶ所設けられていることを特徴とする請求項3乃至9のいずれか1項に記載の回転電機。
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EP12880754.2A EP2874281B1 (en) | 2012-07-11 | 2012-07-11 | Rotary electric machine |
JP2014524497A JP5911577B2 (ja) | 2012-07-11 | 2012-07-11 | 回転電機 |
CN201280074601.6A CN104428981B (zh) | 2012-07-11 | 2012-07-11 | 旋转电机 |
US14/397,896 US9472993B2 (en) | 2012-07-11 | 2012-07-11 | Rotary electric machine |
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US9472994B2 (en) | 2013-07-05 | 2016-10-18 | Mitsubishi Electric Corporation | Rotating electric machine |
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JP6550947B2 (ja) * | 2015-06-11 | 2019-07-31 | 株式会社Ihi | 回転機械 |
EP3387278B1 (en) * | 2015-12-11 | 2019-11-27 | Safran Electrical & Power | Bearing assembly for electrical generator |
CN106899136B (zh) * | 2015-12-21 | 2019-12-06 | 浙江三花汽车零部件有限公司 | 一种执行器 |
WO2021033473A1 (ja) * | 2019-08-21 | 2021-02-25 | 株式会社マキタ | 電動作業機 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0468458U (ja) * | 1990-10-26 | 1992-06-17 | ||
JPH05268742A (ja) * | 1992-03-18 | 1993-10-15 | Hitachi Ltd | 電動機の軸受押え |
JPH0678488A (ja) * | 1992-08-27 | 1994-03-18 | Hitachi Ltd | 電動機の軸受押え |
JPH0735147A (ja) * | 1993-07-26 | 1995-02-03 | Hitachi Ltd | 回転電機 |
JPH07158647A (ja) | 1993-12-02 | 1995-06-20 | Nippondenso Co Ltd | 回転体用軸受の固定装置 |
JP2010226927A (ja) * | 2009-03-25 | 2010-10-07 | Toshiba Corp | 鉄道車両用回転電機の軸受装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5059450U (ja) * | 1973-10-03 | 1975-06-02 | ||
JPS57208318A (en) * | 1981-06-13 | 1982-12-21 | Yamaha Motor Co Ltd | Support structure for bearing |
JPH01123449U (ja) * | 1988-02-18 | 1989-08-22 | ||
JP2771006B2 (ja) * | 1990-02-05 | 1998-07-02 | 富士通株式会社 | ディスク記憶装置の回転体支持装置 |
JPH0468458A (ja) | 1990-07-10 | 1992-03-04 | Oki Electric Ind Co Ltd | データ通信処理装置 |
US5459361A (en) * | 1992-07-14 | 1995-10-17 | Nippon Densan Corporation | Spindle motor |
US5735615A (en) * | 1996-10-04 | 1998-04-07 | Reliance Electric Industrial Company | Insulation arrangement for electrical machine shaft bearing |
JP3690111B2 (ja) * | 1998-05-12 | 2005-08-31 | 松下電器産業株式会社 | 車載用回転操作型電子部品 |
US6472786B1 (en) * | 2000-11-17 | 2002-10-29 | Ametek, Inc. | Bearing protection assembly for motors |
JP3636329B1 (ja) * | 2004-08-17 | 2005-04-06 | 川崎重工業株式会社 | 軸受振動減衰機構 |
JP5714056B2 (ja) * | 2013-06-03 | 2015-05-07 | 三菱電機株式会社 | 回転電機 |
US9472994B2 (en) * | 2013-07-05 | 2016-10-18 | Mitsubishi Electric Corporation | Rotating electric machine |
-
2012
- 2012-07-11 US US14/397,896 patent/US9472993B2/en active Active
- 2012-07-11 WO PCT/JP2012/004480 patent/WO2014009998A1/ja active Application Filing
- 2012-07-11 CN CN201280074601.6A patent/CN104428981B/zh not_active Expired - Fee Related
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- 2012-07-11 EP EP12880754.2A patent/EP2874281B1/en not_active Not-in-force
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0468458U (ja) * | 1990-10-26 | 1992-06-17 | ||
JPH05268742A (ja) * | 1992-03-18 | 1993-10-15 | Hitachi Ltd | 電動機の軸受押え |
JPH0678488A (ja) * | 1992-08-27 | 1994-03-18 | Hitachi Ltd | 電動機の軸受押え |
JPH0735147A (ja) * | 1993-07-26 | 1995-02-03 | Hitachi Ltd | 回転電機 |
JPH07158647A (ja) | 1993-12-02 | 1995-06-20 | Nippondenso Co Ltd | 回転体用軸受の固定装置 |
JP2010226927A (ja) * | 2009-03-25 | 2010-10-07 | Toshiba Corp | 鉄道車両用回転電機の軸受装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2874281A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9472994B2 (en) | 2013-07-05 | 2016-10-18 | Mitsubishi Electric Corporation | Rotating electric machine |
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US9472993B2 (en) | 2016-10-18 |
CN104428981B (zh) | 2017-07-04 |
EP2874281B1 (en) | 2017-03-08 |
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JP5911577B2 (ja) | 2016-04-27 |
US20150155754A1 (en) | 2015-06-04 |
CN104428981A (zh) | 2015-03-18 |
EP2874281A4 (en) | 2016-05-25 |
JPWO2014009998A1 (ja) | 2016-06-20 |
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