CN203305052U - Ultrahigh-speed air-bearing electric spindle - Google Patents
Ultrahigh-speed air-bearing electric spindle Download PDFInfo
- Publication number
- CN203305052U CN203305052U CN2013203452374U CN201320345237U CN203305052U CN 203305052 U CN203305052 U CN 203305052U CN 2013203452374 U CN2013203452374 U CN 2013203452374U CN 201320345237 U CN201320345237 U CN 201320345237U CN 203305052 U CN203305052 U CN 203305052U
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- motor shaft
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Abstract
The utility model discloses an ultrahigh-speed air-bearing electric spindle which comprises a shell, a static-pressure radial air bearing arranged in the shell, a rotor arranged in the static-pressure radial air bearing, a motor shaft connected with the rotor, motor rotors connected with the motor shaft, a rear thrust bearing and a front thrust bearing which are arranged at one end of the static-pressure radial air bearing, a thrust plate arranged at one end of the rotor and a non-contact air sealing ring arranged at one end of the motor shaft, wherein one end of the rotor is connected with the rear thrust bearing and the front thrust bearing through the thrust plate, and the other end of the rotor is connected with the motor shaft. The ultrahigh-speed air-bearing electric spindle is high in extreme rotating speed, low in bearing temperature rise speed and high in rotating precision; the weight of the spindle is reduced, and the dynamic characteristic of the spindle is improved; the problems existing in small-diameter deep hole milling and cooling are solved; a function of cooling the motor rotors of the spindle is also realized; the supporting rigidity of the bearing and the rotating precision of the spindle are improved.
Description
Technical field
The utility model belongs to Speed Grinding equipment field, relates to a kind of ultrahigh speed aerostatic bearing electricity main shaft.
Background technology
The Small-deep Hole internal grinding is one of High-speed machining difficult problem urgently to be resolved hurrily, and high-speed motorized spindles is necessity equipment of Small-deep Hole internal grinding, and its working speed requires over 100,000 rev/mins.Traditional high-speed motorized spindles adopts roller bearings mostly, and the engineering application shows: high-speed cruising has seriously restricted the life-span of rolling bearing.At first lubricated perfect, the traditional grease lubrication of still needing of rolling bearing does not reach desirable lubricant effect, and oil-air lubrication improves production cost by the additional configuration oil gas lubricating system; Secondly, rolling bearing also shows temperature rise under high speed, support stiffness diminishes, and these all will directly affect the running accuracy of main shaft.The ultrahigh speed rolling bearing should adopt the minor diameter hybrid ceramic ball bearing, expensive, needs import.If adopt oil lubrication or water lubrication sliding bearing, under high-speed case, due to the shear action between fluid, will produce a large amount of heat, impel fluid temperature (F.T.) to raise, thereby cause its viscosity to descend, bearing capacity and support stiffness reduce, and due to the rising of fluid temperature (F.T.), axle journal and bearing shell will produce temperature deformation simultaneously, thereby cause bearing clearance to change, affect the performance of bearing.
For Small-deep Hole internal grinding technique, the supply of its grinding coolant is also a great problem.Adopt outside feed liquid way, cooling fluid can't arrive grinding area smoothly; And adopt the inner mode of leading to cooling fluid of electric main shaft, and because main shaft is slender axles, must pass into pressurized cooling fluid, proposed new challenge for the sealing of this main shaft inside.
The utility model content
Technical problem:For the problems referred to above, the utility model provides a kind of limit speed high, and bearing temperature rise is low, the ultrahigh speed air bearing electric main-shaft that rotating accuracy is high.
technical scheme:a kind of ultrahigh speed air bearing electric main-shaft of the present utility model, comprise shell, be arranged on the static pressure radial air bearing in shell, be arranged on the rotor in the static pressure radial air bearing, the motor shaft be connected with rotor, the rotor be connected with motor shaft, be arranged at rear thrust bearing and the front thrust bearing of static pressure radial air bearing one end, and the thrust button and the contactless gas seal ring that is arranged on motor shaft one end that are arranged on rotor one end, rotor one end is installed and is connected with front thrust bearing with rear thrust bearing by thrust button, the rotor other end is installed and is connected with motor shaft.
In the utility model, the draw ratio of rotor is greater than 10.
In the utility model, rotor is the thin wall hollow rotor, center is provided with ladder hole, comprise large through-hole and small through hole, the junction of large through-hole and small through hole is the conical surface, and large through-hole inside is provided with the integrally-built elongated hollow tube of thin-walled, in elongated hollow tube, is provided with central through hole, one end sealing of elongated hollow tube is arranged on the transition conical surface of macropore and aperture, and other end sealing is arranged in motor shaft
In the utility model, rotor is installed and is connected with the motor shaft interference, form overall structure, motor shaft is outside for being multidiameter, comprise three sections of large diameter portion, middle path portion and path parts, the large diameter portion interference is arranged in the large through-hole of rotor, and is fixedly connected with elongated hollow tube, middle path portion is installed and is connected with rotor, and the path part is installed and is connected with gas seal ring; The motor shaft center is provided with ladder hole, comprises the motor shaft macropore, motor shaft aperture and the motor shaft mesopore that connect successively.
Key of the present utility model is, main shaft adopts the supporting of big L/D ratio (reaching more than 10) aerostatic bearing, radially adopts four pressure-feed air bearings, axially adopts one group of closed type static pressure thrust bearing to support; Main shaft is the hollow and thin-walled structure, and inside is provided with the thin-wall long and thin pipeline, be used to passing into cooling fluid.This structure can effectively reduce quality and the rotary inertia of main shaft, and during high speed, pressure-feed air bearing can provide enough support stiffness, and therefore electric main shaft has higher critical speed, has met the technical need of Small-deep Hole internal grinding.
Beneficial effect:The utility model compared with prior art, has the following advantages:
The utility model adopts the big L/D ratio pressure-feed air bearing to support, and limit speed is high, and bearing temperature rise is low, and rotating accuracy is high; Main shaft adopts hollow structure, alleviates main shaft weight, improves the dynamic characteristic of main shaft; Adopt the main shaft mesopore to supply with the grinding coolant technology, solved the cooling problem of Small-deep Hole grinding, also play the effect of cooling spindle motor rotor, improved the support stiffness of bearing and the rotating accuracy of main shaft; For preventing the cooling fluid leakage, the cooling fluid supply side adopts contactless air seal technology.
The utility model is compared with traditional rolling bearing electricity main shaft or fluid bearing, and something in common is: adopt built-in motor to drive and by the cooling jacket circulating cooling.Difference is: compare traditional rolling bearing and fluid lubrication sliding bearing, it is large that the big L/D ratio air bearing has radial rigidity, and along with rotating speed raises, dynamic pressure effect strengthens, thereby promote load-bearing rigidity.Main shaft adopts hollow structure, significantly improves main shaft critical speed; Adopt mesopore to supply with grinding coolant, can further reduce the spindle motor temperature rise; Contactless air seal efficiently, do not affect main shaft power consumption and rotating accuracy.
The accompanying drawing explanation
Fig. 1 is the structural representation of the utility model ultrahigh speed air bearing electric main-shaft.
Fig. 2 is the structural representation of the utility model ultrahigh speed air bearing electric main-shaft.
Fig. 3 is the rotor structure schematic diagram.
Fig. 4 is motor shaft part-structure schematic diagram.
Fig. 5 is static pressure radial air bearing structure schematic diagram.
In figure, have: shell 1, motor cooling water inlet 101, the first compressed air air admission holes 105, the second compressed air air admission hole 104, the 3rd compressed air air admission hole 103, the four compressed air air admission hole 102, the first air inlet rings 201, the second air inlet ring 202, the 3rd air inlet ring 203, the 4th air inlet ring 204, inlet channel 106, hydrostatic bearing air admission hole 107, the first ventholes 108, the second venthole 109, the 3rd venthole 110, the outside outgassing groove 205 of cooling liquid inlet 1101, the first, the second outside outgassing groove 206, the 3rd outside outgassing groove 207, exhaust passage 113, first row pore 111, second row pore 112, non-contacting gas seal compression air inlet hole 114, rotor 20, large through-hole 2002, small through hole 2001, elongated hollow tube 18, central through hole 1801, motor shaft 17, macropore 1702, mesopore 1701, aperture 1703, static pressure radial air bearing 2, the first inner outgassing groove 208, the second inner outgassing groove 209, the 3rd inner outgassing groove 210, the first intercommunicating pores 211, the second intercommunicating pore 212, third connecting hole 213, thrust bearing air admission hole 215, orifice restriction device 214, rear thrust bearing 3, throttle orifice 301, rear thrust bearing air inlet duct 302, front thrust bearing 4, front thrust bearing air inlet duct 401, front thrust bearing throttle orifice 402, end cap 5, end cap air admission hole 501, cooling jacket 6, motor stator 7, rotor 8, cooling water overflows cover 9, water inlet pipe 11, outlet pipe 13, gas seal ring 14, thrust button 19, adjustment ring 16, rear-end of spindle lid 12, emery wheel extension bar 21,
The specific embodiment
Be illustrated in figure 1 a kind of ultrahigh speed air bearing electric main-shaft schematic diagram, mainly comprise: shell 1, static pressure radial air bearing 2, a pair of closed type static pressure thrust air bearing (rear thrust bearing 3 and front thrust bearing 4), rotor 20, electric machine assembly and motor side gas-tight sealing.Rotor 20 is provided with ladder hole for thin wall hollow rotor ，Qi center, comprises large through-hole 2002 and small through hole 2001, and the junction of large through-hole 2002 and small through hole 2001 is the conical surface.Elongated hollow tube 18 is equipped with in large through-hole 2002 inside of rotor 20, and elongated hollow tube 18 is provided with central through hole 1801.One end of elongated hollow tube 18 is arranged on the transition conical surface of large through-hole 2002 and small through hole 2001, and adopts the sealing ring sealing, and the other end is arranged in motor shaft 17, and adopts the sealing ring sealing.Motor shaft 17 is multidiameter, and being divided into is three sections: the large diameter portion interference is arranged in the large through-hole 2002 of rotor 20, and elongate hollow tube 18, middle path portion interference mounting rotor of electric motor 8, the gas seal ring 14 of path part equipped with non-contact.Motor shaft 17 centers are provided with ladder hole, comprise motor shaft macropore 1702, motor shaft mesopore 1701 and motor shaft aperture 1703, between motor shaft macropore 1702 and motor shaft mesopore 1701, adopt 1703 transition of motor shaft aperture, motor shaft mesopore 1701 internal clearances are installed cooling water and are overflowed cover 9.Static pressure radial air bearing 2 is equipped with in the outside of rotor 20, static pressure radial air bearing 2 is provided with 8 cribbing discharge orifices altogether, be provided with simultaneously 4 air inlet rings, be respectively the first air inlet ring 201, the second air inlet ring 202, the 3rd air inlet ring 203 and the 4th air inlet ring 204, two cribbing discharge orifices are installed in each air inlet ring, at the outside outgassing groove be provided with on the outer wall of static pressure radial air bearing 2 between two adjacent air inlet rings, be respectively: the first outside outgassing groove 205, the second outside outgassing groove 206, the 3rd outside outgassing groove 207, on inwall, be provided with the inside outgassing groove corresponding with outside outgassing groove, be respectively: the first inner outgassing groove 208, the second inner outgassing groove 209, the 3rd inner outgassing groove 210.Between inside and outside outgassing groove, be provided with intercommunicating pore, be respectively: the first intercommunicating pore 211, the second intercommunicating pore 212 and third connecting hole 213.The front end of bearing 2 is provided with a thrust bearing air admission hole 215, and thrust bearing air admission hole 215 is communicated with air inlet ring 201.Shell 1 is equipped with in the outside of static pressure radial air bearing 2, and shell 1 is provided with a motor cooling water inlet 101, enters motor cooling jacket 6 be used to passing into external refrigeration water.Shell 1 is provided with 4 bearing compressed air air admission holes, be respectively: the first compressed air air admission hole 105, the second compressed air air admission hole 104, the 3rd compressed air air admission hole 103 and the 4th compressed air air admission hole 102, these 4 compressed air air admission holes are communicated with the first air inlet ring 201, the second air inlet ring 202, the 3rd air inlet ring 203 and the 4th air inlet ring 204 air inlet rings respectively, 4 compressed air air admission holes are interconnected by an inlet channel 106 simultaneously, and by external air source, pass into compressed air by the hydrostatic bearing air admission hole 107 be located on shell 1.Shell 1 is provided with 3 bearing inner air ventholes, be respectively the first venthole 108, the second venthole 109 and the 3rd venthole 110,3 ventholes are connected with outside outgassing groove the 206, the 3rd outside outgassing groove 207 of the first outside outgassing groove 205, second on bearing 2 outer walls respectively, three ventholes are connected by the exhaust passage 113 on shell 1, exhaust passage 113 communicates with the external world by the first row pore 111 on shell 1 and second row pore 112, be used to getting rid of the air of bearing inside.The front end of static pressure radial air bearing 2 is equipped with a pair of enclosed thrust bearing 3 and 4, rear thrust bearing 3 be arranged on static pressure radial air bearing 2 in, rear thrust bearing 3 is provided with rear thrust bearing air inlet duct 302 and thrust bearing throttle orifice 301 after several, throttle orifice 301 and air inlet duct 302 are connected, and air inlet duct 302 communicates with the first air inlet ring 201 on static pressure radial air bearing 2 by the thrust bearing air admission hole hole 215 on static pressure radial air bearing 2.The end that rear thrust bearing 3 closes on end cap 5 is provided with thrust button 19, and thrust button 19 interference are arranged on rotor 20.The front end of thrust button 19 is equipped with front thrust bearing 4, front thrust bearing 4 is provided with front thrust bearing air inlet duct 401 and several front thrust bearing throttle orifices 402, front thrust bearing air inlet duct 401 and throttle orifice 402 communicate, and front thrust bearing air inlet duct 401 communicates with external air source by the end cap air admission hole 501 be arranged on end cap 5.Adjustment ring 16 is equipped with in the outside of thrust button, be used to adjusting the air film gap of enclosed thrust bearing 3 and 4.Non-contact type gas sealing device is equipped with in the rear end of motor shaft 17, and this gas-tight sealing passes into compressed air by the non-contacting gas seal compression air inlet hole 114 on shell 1.
By non-contacting gas seal compression air inlet hole 114, hydrostatic bearing air admission hole 107 and end cap air admission hole 501, pass into compressed air, pass into cooling water by motor cooling water inlet 101, pass into cooling fluid by cooling liquid inlet 1101.Cooling fluid flow through successively through hole mesopore 1701, aperture 1703 and the macropore 1702 of cooling liquid inlet 1101, motor shaft ladder, the central through hole 1801 of elongated hollow tube 18 and the small through hole 2001 of rotor 20, enter the endoporus of emery wheel extension bar, finally enter machining area.Contactless air seal prevents that the leakage cooling fluid that cooling water overflows between cover 9 and motor shaft 17 from entering motor.The compressed air passed into by hydrostatic bearing air admission hole 107 and end cap air admission hole 501, in the gap of pressure-feed air bearing, form the carrying air film, to compare other fluid lubricant extremely low due to air, therefore friction power loss is low, temperature rise is little, simultaneously due to the dynamic pressure effect of air bearing when rotor high-speed rotates, along with the rising of rotor speed, the support stiffness of bearing also increases thereupon, to guarantee the steady running of electric main shaft when the high speed.
Claims (4)
1. ultrahigh speed air bearing electric main-shaft, it is characterized in that, this electricity main shaft comprises shell (1), be arranged on the static pressure radial air bearing (2) in described shell (1), be arranged on the rotor (20) in described static pressure radial air bearing (2), the motor shaft (17) be connected with described rotor (20), the rotor (8) be connected with described motor shaft (17), be arranged at rear thrust bearing (3) and the front thrust bearing (4) of described static pressure radial air bearing (2) one ends, and be arranged on the thrust button (19) of described rotor (20) one ends and be arranged on the contactless gas seal ring (14) of described motor shaft (17) one ends, rotor (20) one ends are installed and are connected with front thrust bearing (4) with rear thrust bearing (3) by thrust button (19), rotor (20) other end is installed and is connected with motor shaft (17).
2. ultrahigh speed air bearing electric main-shaft according to claim 1, is characterized in that, the draw ratio of described rotor (20) is greater than 10.
3. ultrahigh speed air bearing electric main-shaft according to claim 1 and 2, it is characterized in that, described rotor (20) is the thin wall hollow rotor, center is provided with ladder hole, comprise large through-hole (2002) and small through hole (2001), the junction of described large through-hole (2002) and small through hole (2001) is the conical surface, large through-hole (2002) inside is provided with the integrally-built elongated hollow tube of thin-walled (18), in described elongated hollow tube (18), be provided with central through hole (1801), one end sealing of elongated hollow tube (18) is arranged on the transition conical surface of macropore (2002) and aperture (2001), other end sealing is arranged in motor shaft (17).
4. ultrahigh speed air bearing electric main-shaft according to claim 3, it is characterized in that, described rotor (20) is installed and is connected with motor shaft (17) interference, form overall structure, described motor shaft (17) outside is multidiameter, comprise three sections of large diameter portion, middle path portion and path parts, described large diameter portion interference is arranged in the large through-hole (2002) of rotor (20), and be fixedly connected with elongated hollow tube (18), described middle path portion is installed and is connected with rotor (8), and described path part is installed and is connected with gas seal ring (14); Motor shaft (17) center is provided with ladder hole, comprises the motor shaft macropore (1702), motor shaft aperture (1703) and the motor shaft mesopore (1701) that connect successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203452374U CN203305052U (en) | 2013-06-17 | 2013-06-17 | Ultrahigh-speed air-bearing electric spindle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203452374U CN203305052U (en) | 2013-06-17 | 2013-06-17 | Ultrahigh-speed air-bearing electric spindle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203305052U true CN203305052U (en) | 2013-11-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203452374U Withdrawn - After Issue CN203305052U (en) | 2013-06-17 | 2013-06-17 | Ultrahigh-speed air-bearing electric spindle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203305052U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286679A (en) * | 2013-06-17 | 2013-09-11 | 东南大学 | Super high speed air bearing electric main shaft |
| CN107322013A (en) * | 2017-08-29 | 2017-11-07 | 孙嘉骏 | The noncontact driven using air motor supports rotary main shaft device |
| CN108941623A (en) * | 2018-01-02 | 2018-12-07 | 中国计量大学 | A kind of composite throttling formula static pressure air-bearing electro spindle |
| CN112743452A (en) * | 2020-12-21 | 2021-05-04 | 北京中电科电子装备有限公司 | Air supporting main shaft of thinning machine and thinning machine |
-
2013
- 2013-06-17 CN CN2013203452374U patent/CN203305052U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286679A (en) * | 2013-06-17 | 2013-09-11 | 东南大学 | Super high speed air bearing electric main shaft |
| CN103286679B (en) * | 2013-06-17 | 2015-12-02 | 东南大学 | A kind of ultrahigh speed air bearing electric main-shaft |
| CN107322013A (en) * | 2017-08-29 | 2017-11-07 | 孙嘉骏 | The noncontact driven using air motor supports rotary main shaft device |
| CN108941623A (en) * | 2018-01-02 | 2018-12-07 | 中国计量大学 | A kind of composite throttling formula static pressure air-bearing electro spindle |
| CN108941623B (en) * | 2018-01-02 | 2024-04-16 | 中国计量大学 | Composite throttling type static pressure air floatation electric spindle |
| CN112743452A (en) * | 2020-12-21 | 2021-05-04 | 北京中电科电子装备有限公司 | Air supporting main shaft of thinning machine and thinning machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131127 Effective date of abandoning: 20151202 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |