CN106735335A - A kind of oil-air lubrication high-speed electric main shaft of accurate fuel feeding - Google Patents
A kind of oil-air lubrication high-speed electric main shaft of accurate fuel feeding Download PDFInfo
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- CN106735335A CN106735335A CN201710079281.8A CN201710079281A CN106735335A CN 106735335 A CN106735335 A CN 106735335A CN 201710079281 A CN201710079281 A CN 201710079281A CN 106735335 A CN106735335 A CN 106735335A
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- oil
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- air lubrication
- housing
- room
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/121—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction
- B23Q11/122—Lubricant supply devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/121—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction
- B23Q11/123—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction for lubricating spindle bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
- B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or spindles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a kind of oil-air lubrication high-speed electric main shaft of accurate fuel feeding, belong to electro spindle technical field.Whole electro spindle includes being fixed with stator in housing, housing;Housing two ends are connected between two bearings of being connected respectively in forward and backward bearing chamber, bearing chamber, two bearings and are separated with outer dottle pin by dottle pin in bearing;Front and back bearings support mandrel, and the rotor matched with stator is provided with mandrel.Each bearing is respectively provided with an oil-air lubrication oil circuit;Annular cooling bath is respectively provided with fore bearing room and housing;Oil and gas import and oil gas vent are provided with bear box, oil-gas pipeline is provided with oil gas nozzle by housing, bearing chamber and the outer dottle pin of bearing in pipe end, and each bearing has single pipeline road, nozzle and return line.The present invention realizes the precise control of the oil-air lubrication parameter of bearing by designing independent oil-air lubrication oil circuit, nozzle and oil return line, improves the lubricant effect of bearing, strengthens electro spindle performance.
Description
Technical field
The present invention relates to a kind of electro spindle, more particularly to a kind of high-speed electric main shaft of the accurate fuel feeding of use oil-air lubrication.
Background technology
With the development of high speed machining, requirement more and more higher of the manufacturing industry to lathe rotating speed.As the core of lathe
Part, electro spindle also develops in the direction towards high speed.The gyration of electro spindle depends on the support shaft at mandrel two ends
Hold, the rotating speed and bearing capacity of bearing directly affects the performance of electro spindle.
Lubrication be influence bearing performance a key factor, traditional electric mainshaft bearing lubricating system be generally grease lubrication,
Oil lubrication etc..These lubricating systems are generally excessive lubrication, not only waste of resource, and extra frictional force can be also produced in bearing
Square, influences bearing performance, limits the limit speed of electro spindle.In order to improve bearing rotating speed, oil gas being used current high-speed bearing more
Lubrication.Oil-air lubrication belongs to micro lubricating, is characterized in by compressed air transporting quantitative lubricating oil to bearing, due to
Lubricants capacity is few, and generation moment of friction is low in bearing, and bearing heating amount is small, and bearing rotating speed can be greatly improved;And compressed air
It is applied not only to transport lubricating oil, the cooling effect of bearing can also be improved, and sealing gland is carried out to bearing.Because oil-air lubrication has
The features such as saving oil mass, reduction bearing temperature rise, raising bearing rotating speed, is very suitable for the lubrication of high-speed electric main shaft bearing.
But current many oil-air lubrication electro spindle confession accuracies are not high, commonly using an oil circuit simultaneously for two bearings are supplied
Oil, and identical oil-air lubrication parameter is used to different bearings.If a use of oil circuit being simultaneously two bearing fuel feeding, if set
Meter is unreasonable to cause two bearing fuel feeding uneven, because oil-air lubrication is micro lubricating, easily cause bearing fuel feeding deficiency, lead
Cause bearing sintering;Model, operating mode difference due to different bearings, actually required oil-air lubrication parameter are different, according to unification
Lubrication parameter, it is excessive to be easily caused split bearing fuel delivery, and bearing temperature rise increases.
The content of the invention
In order to overcome above-mentioned technical disadvantages, the limit speed of electro spindle is improved, each axle is capable of achieving the invention provides one kind
The oil-air lubrication high-speed electric main shaft design of accurate, independent oil supply is held, is designed by independent oil passage and a plurality of oil return line, it is ensured that
The accuracy of bearing fuel feeding, and different lubrication parameters can be used to different bearings.
To reach above-mentioned purpose, the present invention is adopted the technical scheme that:
A kind of oil-air lubrication high-speed electric main shaft of accurate fuel feeding, including:Housing,
And the stator in housing is fixed on, housing connects forward and backward bearing chamber, and forward and backward bearing indoor section is not connected serially to
Dottle pin and the outer dottle pin of bearing, forward and backward bearing support mandrel, with stator phase in bearing are installed between few two bearings, adjacent bearing
The rotor matched somebody with somebody is fixed on mandrel;
Each bearing is respectively provided with an oil-air lubrication oil circuit, is respectively provided with shell body rear cover and each bar oil-gas lubricating oil
Oil and gas import and oil gas vent that road communicates, the oil-air lubrication nozzle of bearing fuel feeding are respectively arranged on the outer dottle pin of bearing and bearing
Interior, the nozzle in nozzle or bearing chamber that the lubrication oil gas in oil-air lubrication oil circuit passes through the outer dottle pin of bearing sprays into bearing,
To the inner ring fuel feeding of bearing;
Also include being arranged at the spill port and recovery oil circuit of side before and after each bearing, each recovery oil circuit one end respectively with return
Oilhole is communicated, and the other end meets at a remittance oil groove with other recovery oil circuits, and electro spindle is discharged through the oil outlet on bearing chamber;
Also include being arranged at the cooling line of annular cooling bath and insertion housing in fore bearing room and in housing, cooling
Pipeline is connected with the cooling liquid inlet installed in shell body rear cover and outlet, and cooling line is by the ring in enclosure interior and fore bearing room
Shape cooling bath is connected, and the coolant in cooling line is water.
Further, two bearings are respectively provided with single oil-air lubrication oil circuit, two oil-gas lubricating oils in the fore bearing room
Road was located at electro spindle center line and was separated by 30 ° of section respectively;Two bearings are also provided with single oil gas in the rear bearing room
Lubricant passage way, two oil-air lubrication oil circuits were located at electro spindle center line and were separated by 30 ° of section respectively.
Specifically, the oil-air lubrication oil circuit has four, the lubrication oil gas in the first oil-air lubrication oil circuit is from shell body rear cover
Into electro spindle, through housing, fore bearing room, the outer dottle pin of bearing sprays into bearing by the nozzle of outer dottle pin;Second oil-gas lubricating oil
Lubrication oil gas in road enters electro spindle from shell body rear cover, and through housing, fore bearing room is sprayed by the nozzle of fore bearing indoor design
Enter bearing;Lubrication oil gas in 3rd oil-air lubrication oil circuit enters electro spindle from shell body rear cover, the bearing chamber after, by rear bearing
The nozzle of indoor design sprays into bearing;Lubrication oil gas in 4th oil-air lubrication oil circuit enters electro spindle from shell body rear cover, after
Bearing chamber, the outer dottle pin of bearing, bearing is sprayed into by the nozzle of outer dottle pin.
Specifically, being provided with four oil and gas imports, an oil gas vent in shell body rear cover, fore bearing room is provided with an oil
Gas is exported;Four oil and gas imports connect four oil-air lubrication oil circuits respectively.
Each bearing lubricating oil circuit is separate, and the oil-air lubrication parameter of different operating mode bearings can be adjusted independently, according to front and rear
The model of bearing, load are different, and actually used middle front and back bearings fuel delivery can be adjusted respectively.
There is recovery oil circuit side before and after each bearing, respectively there is four oil return lines in forward and backward bearing room, by the forward and backward side of bearing
Lubricating oil centralized recovery, and reclaimed by oil return interface.
Specifically, four spill ports are provided with fore bearing room, respectively before and after two bearings, in fore bearing room
Lubricating oil enters oil return line through spill port, in coming together in the remittance oil groove of fore bearing room, then discharges electricity through the oil outlet on bearing chamber
Main shaft;Four spill ports are also configured with before and after the bearing in bearing room afterwards, by a Ge Hui oil grooves UNICOM, the lubrication in rear bearing room
Oil enters oil return line 104 through spill port, comes together in the remittance oil groove of rear bearing chamber, and the oil outlet discharge electricity through housing rear end lid is main
Axle.
Further, the oil-air lubrication high-speed electric main shaft of the accurate fuel feeding is in shell body rear cover and housing, housing and fore bearing
The outer dottle pin of room, fore bearing room and bearing, shell body rear cover set sealing with the outer dottle pin junction of rear bearing chamber, rear bearing chamber and bearing
Circle.
Further, at least provided with three, wherein at least one annular cooling bath is arranged at fore bearing to the annular cooling bath
Interior, at least two annular cooling baths are arranged in housing.Annular cooling bath in fore bearing room is by bearing Interior Layout and bearing
Outdoor set hot charging composition, the annular cooling bath in housing is made up of the annular groove on water jacket and housing, two in housing annular
Cooling bath has through hole in electro spindle top design.
The beneficial effects of the invention are as follows:By lubricant passage way, lubricating nozzle to each design bearing independence, each bearing is realized
Independent fuel feeding, it is ensured that the accuracy of each bearing lubrication fuel feeding, and different fuel delivery parameters can be used to different bearings;Simultaneously each
The forward and backward side design oil return line of bearing, prevents Bearing inner from trapped fuel occur, the reliability of bearing oil return is realized, so as to realize bearing
The precise control of fuel delivery, improves the greasy property of bearing, can further improve the limit speed of electro spindle.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the electro spindle end view of disclosure of the invention;
Fig. 2 is the A-A sectional views of Fig. 1;
Fig. 3 is the B-B sectional views of Fig. 1;
Fig. 4 is the C-C sectional views of Fig. 1.
Wherein:1- mandrels;2- fore bearings;The outer dottle pin of 3- fore bearings;4- fore bearings room;5- housings;6- stators;7- water jackets;
8- rotors;Bearing chamber after 9-;The outer dottle pin of bearing after 10-;Bearing after 11-;Dottle pin in 12- fore bearings;Dottle pin in bearing after 13-;
101- the first oil-air lubrication oil circuits;The oil-air lubrication oil circuits of 102- the 4th;103- fore bearings room oil return line;Bearing chamber oil return after 104-
Road;105- the second oil-air lubrication oil circuits;The oil-air lubrication oil circuits of 106- the 3rd;107- coolant inlet pipelines;108- coolants go out
Mouth pipeline;The first annular cooling baths of 109-;The annular cooling baths of 110- second;The annular cooling baths of 111- the 3rd;112- cooling baths lead to
Hole.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiments of the invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, the scope of protection of the invention is belonged to.
With reference to Fig. 1,2,3,4 and specific implementation example, the invention will be further described:
Electro spindle of the invention include mandrel 1, fore bearing 2, fore bearing room 4, housing 5, stator 6, water jacket 7, rotor 8, after
Bearing chamber 9, rear bearing 10 etc..Forward and backward bearing chamber is connected by housing 5, is fixed with stator 6 in housing, is matched with stator
Rotor 8 is fixed on mandrel 1.Forward and backward bearing indoor section is not connected two bearings, and dottle pin in bearing is installed between adjacent bearing
12nd, 13 and the outer dottle pin 3,10 of bearing, separated by dottle pin 12,13 in bearing and the outer dottle pin 3,10 of bearing between bearing, axle
Hold support mandrel 1.
4 oil and gas imports, 1 oil gas vent are provided with shell body rear cover, fore bearing room is provided with 1 oil gas vent.4
Oil and gas import corresponds to 4 oil-air lubrication oil circuits respectively.The lubrication of fore bearing is by the first oil-air lubrication oil circuit 101, and the second oil
Realize on air lubricating oil road 105.First oil-air lubrication oil circuit is located at section A-A, and lubrication oil gas enters electro spindle, passes through by housing rear end
Housing, fore bearing room, the nozzle into the outer dottle pin of bearing sprays into bearing and realizes lubrication.Second oil-air lubrication oil circuit is located at and cuts
On the B-B of face, lubrication oil gas enters electro spindle by housing rear end, and through housing, fore bearing room, the nozzle in the past bearing chamber enters axle
Hold, realize bearing lubrication.For the three, the 4th lubricant passage ways design of rear bearing fuel feeding is similar with fore bearing.3rd oil-air lubrication
Oil circuit 106 is located at section B-B, and lubrication oil gas enters electro spindle through shell body rear cover, the bearing chamber after, by the spray in rear bearing room
Mouth sprays into bearing.4th oil-air lubrication oil circuit 102 is located at Section A-A, and lubrication oil gas enters electro spindle through shell body rear cover, through rear axle
Room is held, into the outer dottle pin of rear bearing, bearing is sprayed into by the nozzle in the outer dottle pin of rear bearing, realize bearing lubrication.
The oil-air lubrication oil circuit shell body rear cover and housing, housing and fore bearing room, fore bearing room and bearing outward dottle pin,
Shell body rear cover sets sealing ring with the outer dottle pin junction of rear bearing chamber, rear bearing chamber and bearing.Two bearings are all provided with fore bearing room
Single oil-air lubrication oil circuit is put, two oil-air lubrication oil circuits were located at electro spindle center line and are separated by 30 ° of section respectively;Afterwards
Two bearings are also provided with single oil-air lubrication oil circuit in bearing chamber, and oil-air lubrication oil circuit was located at electro spindle center line and is separated by respectively
On 30 ° of section.
Each bearing has single oil feeding line in electro spindle, and each oil feeding line is not connected mutually, separate in structure, is kept away
Exempt from interfering between oil circuit, improve the accuracy of oil-air lubrication fuel feeding, and can be according to bearing operating mode to each bearing lubrication
Parameter is adjusted.
4 oil return lines 103 of the fore bearing room for collecting lubricating oil are provided with fore bearing room, fore bearing is provided with 4 in room
Individual spill port, respectively before and after 2 bearings, 4 spill ports are connected by a remittance oil groove, the lubricating oil warp in fore bearing room
Spill port enters oil return line 103, in coming together in the remittance oil groove of fore bearing room, then discharges electro spindle through the oil outlet on bearing chamber.
4 oil return lines 104 of the fore bearing room for collecting lubricating oil are provided with bearing room afterwards, are also designed before and after the bearing in rear bearing room
There are 4 spill ports, connected by a remittance oil groove, the lubricating oil in rear bearing room enters oil return line 104 through spill port, after coming together in
In the remittance oil groove of bearing chamber, electro spindle is discharged through the oil outlet of housing rear end lid.Oil return line design ensures that nothing is deposited in bearing chamber
Oil, prevents bearing from excessive lubrication phenomenon occur, improves oil-air lubrication fuel feeding accuracy.
There are 3 annular cooling baths in electro spindle, there is cooling bath 111 in fore bearing room, there are two annular cooling baths in housing
110 and 109.3rd annular cooling bath 111 is made up of bearing Interior Layout and bearing chamber overcoat hot charging, the second annular cooling bath 110
It is made up of the annular groove on water jacket and housing with first annular cooling bath 109, the second annular cooling bath 110 and first annular cooling
Groove 109 has through hole 112 in electro spindle top design.Cooling liquid inlet and each one cooling line of insertion housing of correspondence of outlet,
Cooling line connects the annular cooling bath in enclosure interior and fore bearing room.Coolant enters through coolant inlet pipeline 107
First annular cooling bath 109, after in first annular cooling bath 109 full of coolant, coolant is through annular cooling bath through hole 112
Into the second annular cooling bath 110, coolant cooling line again through being communicated with annular groove enters the 3rd annular cooling bath 111,
Be designed with dividing plate between the 3rd annular entrance of cooling bath 111 and outlet, coolant full of after the 3rd annular cooling bath 111 through coolant
Export pipeline 108 leaves electro spindle.Coolant reusable edible, coolant is water.
Claims (9)
1. a kind of oil-air lubrication high-speed electric main shaft of accurate fuel feeding, it is characterised in that including housing, and be fixed in housing
Stator, housing connects forward and backward bearing chamber, and forward and backward bearing indoor section is not connected two bearings, is installed in bearing between adjacent bearing
Dottle pin and the outer dottle pin of bearing, forward and backward bearing support mandrel are fixed on mandrel with the rotor that stator matches;
Each bearing is respectively provided with an oil-air lubrication oil circuit, is respectively provided with shell body rear cover and each bar oil-air lubrication oil circuit phase
Logical oil and gas import and oil gas vent, nozzle, the lubricating oil in oil-air lubrication oil circuit are set on the outer dottle pin of bearing and in bearing chamber
The nozzle in nozzle or bearing chamber that gas passes through the outer dottle pin of bearing sprays into bearing;
Also include being arranged at the spill port and recovery oil circuit of side before and after each bearing, each recovery oil circuit one end respectively with spill port
Communicate, the other end meets at a remittance oil groove with other recovery oil circuits, electro spindle is discharged through the oil outlet on bearing chamber;
Also include being arranged at the cooling line of annular cooling bath and insertion housing in fore bearing room and in housing, cooling line
It is connected with the cooling liquid inlet installed in shell body rear cover and outlet, cooling line will be annular cold in enclosure interior and fore bearing room
But groove connection, the coolant in cooling line is water.
2. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that the fore bearing room
Interior two bearings are respectively provided with single oil-air lubrication oil circuit, and two oil-air lubrication oil circuits were located at electro spindle center line and are separated by respectively
On 30 ° of section;Two bearings are also provided with single oil-air lubrication oil circuit, two oil-air lubrication oil circuit difference in the rear bearing room
Electro spindle center line was located to be separated by 30 ° of section.
3. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that the oil-air lubrication
Oil circuit has four, and the lubrication oil gas in the first oil-air lubrication oil circuit enters electro spindle from shell body rear cover, through housing, fore bearing room,
The outer dottle pin of bearing, bearing is sprayed into by the nozzle of outer dottle pin;Lubrication oil gas in second oil-air lubrication oil circuit enters from shell body rear cover
Enter electro spindle, through housing, fore bearing room sprays into bearing by the nozzle of fore bearing indoor design;In 3rd oil-air lubrication oil circuit
Lubrication oil gas enter electro spindle from shell body rear cover, the bearing chamber after sprays into bearing by the nozzle of rear bearing indoor design;The
Lubrication oil gas in four oil-air lubrication oil circuits enters electro spindle from shell body rear cover, the bearing chamber after, the outer dottle pin of bearing, by outward every
The nozzle of pad sprays into bearing.
4. the oil-air lubrication high-speed electric main shaft of the accurate fuel feeding according to claim 1 or 3, it is characterised in that shell body rear cover
On be provided with four oil and gas imports, an oil gas vent, fore bearing room is provided with an oil gas vent;Four oil and gas import difference
Four oil-air lubrication oil circuits of connection.
5. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that the oil-air lubrication
Oil circuit is not connected mutually.
6. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that the fore bearing room
Four spill ports are inside provided with, respectively before and after two bearings, the lubricating oil in fore bearing room enters oil return through spill port
Road, in coming together in the remittance oil groove of fore bearing room, then discharges electro spindle through the oil outlet on bearing chamber;Afterwards before the bearing in bearing room
After be also configured with four spill ports, by a Ge Hui oil grooves UNICOM, the lubricating oil in rear bearing room enters oil return line through spill port
104, come together in the remittance oil groove of rear bearing chamber, discharge electro spindle through the oil outlet of housing rear end lid.
7. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that shell body rear cover with
Outside the outer dottle pin of housing, housing and fore bearing room, fore bearing room and bearing, shell body rear cover and rear bearing chamber, rear bearing chamber and bearing
Dottle pin junction sets seal.
8. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that:The annular cooling
At least provided with three, wherein at least one annular cooling bath is arranged in fore bearing room groove, and at least two annular cooling baths are set
In in housing.
9. the oil-air lubrication high-speed electric main shaft of accurate fuel feeding according to claim 1, it is characterised in that:In fore bearing room
Annular cooling bath is made up of bearing Interior Layout and bearing chamber overcoat hot charging, and the annular cooling bath in housing is by water jacket and housing
Annular groove is constituted, and the annular cooling bath of two in housing has through hole in electro spindle top design.
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