CN205025934U - Quiet dynamic pressure main shaft - Google Patents
Quiet dynamic pressure main shaft Download PDFInfo
- Publication number
- CN205025934U CN205025934U CN201520732012.3U CN201520732012U CN205025934U CN 205025934 U CN205025934 U CN 205025934U CN 201520732012 U CN201520732012 U CN 201520732012U CN 205025934 U CN205025934 U CN 205025934U
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- main shaft
- oil
- bearing
- dynamic pressure
- quiet dynamic
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Abstract
The utility model discloses a quiet dynamic pressure main shaft, including the main shaft body and main shaft, and an antifriction bearing, first quiet dynamic pressure, the quiet dynamic pressure of second and the 2nd antifriction bearing, the hydraulic pressure oil groove that the twice annular has a perfect understanding is each other all driven to first quiet dynamic pressure and the quiet dynamic pressure's of second lateral part surface, and a plurality of wedge oil pockets have all been opened to the lateral part internal surface, and a plurality of wedge oil pockets all feed through with the hydraulic pressure oil groove, the internal oil feed that is provided with of main shaft is said and is gone out the oil duct, it says that interior pressure is oily to get into the oil feed, get into first quiet dynamic pressure and the quiet dynamic pressure of second from the hydraulic pressure oil groove, and spill over from the exact fit interfacial crack of first quiet dynamic pressure and the quiet dynamic pressure of second and main shaft and become low pressure oil, low pressure oil gets into out the oil duct and carries out the sufficient lubrication to an antifriction bearing and the 2nd antifriction bearing, can guarantee that the main shaft is rising, stop, the main shaft does not overlap the contact friction with quiet dynamic pressure when oil circuit trouble and overload, the fail safe nature of main shaft operation has been improved.
Description
Technical field
The utility model relates to a kind of main shaft, particularly relates to a kind of quiet dynamic pressure spindle adopting rolling bearing to carry out guide and enhancing.
Background technique
Main shaft is the critical component of all kinds of lathe.Adopt rolling bearing and hydrostatic and hydrodynamic bearing to be all typical design ap-plication schemes as main shaft bearing, the two respectively has superiority.Its rolling bearing of main shaft adopting rolling bearing is the standard piece of industrialized production, function great variety of goods, and thus design and manufacture cost is lower, and working service is convenient, is widely used.But make motion of main shaft precision stability poor thus the operating life affecting main shaft because rolling bearing exists mechanical wear, in addition because bearing is combined by more than one piece, the problems such as the more complicated and accuracy of manufacturing of structure, adopt the main shaft of rolling bearing also to there is the not good enough problem such as kinematic accuracy, speed, vibration, lubrication.The bearing that quiet dynamic pressure spindle adopts is overall manufacture, and structure is simple, thus can accomplish higher accuracy of manufacturing, due to the existence of oil film, main shaft does not contact with bearing housing, therefore also there is not mechanical wear, and quiet dynamic pressure spindle has the excellent operating life of infinite height in principle.But in actual use, owing to there is the reasons such as the regular starting and stopping of main shaft and oil path failure, when when not producing quiet dynamic pressure effect and main shaft work in time, the change of bearing capacity exceedes the bearing capacity of quiet dynamic pressure oil film, main shaft and bearing just may produce and contact and wear and tear, sometimes may produce badly damaged, therefore, quiet dynamic pressure spindle has more harsh service condition compared with rolling bearing main shaft.From the angle of project organization space, small-sized main shaft is not enough to carrying canonical loading particularly axial load because bearing housing oil film surface area is less, which limits some application to axial precision and the higher small-sized main shaft of rigidity requirement.In addition, quiet dynamic pressure spindle need be equipped with special hydraulic system, and manufacture, use, maintenance cost is higher, these all constrain the application of quiet dynamic pressure spindle.
Model utility content
The technical problem that one, will solve
The purpose of this utility model is for the problems referred to above existing for prior art, and spy provides a kind of enhancement easy to use, reliable and secure, long service life, excellent performance quiet dynamic pressure spindle, with the deficiency that the using scope overcoming existing quiet dynamic pressure spindle is narrower.
Two, technological scheme
For solving the problems of the technologies described above, the utility model provides a kind of quiet dynamic pressure spindle, and described quiet dynamic pressure spindle comprises: main shaft and the main shaft be matched with in described main shaft; The first rolling bearing, the first hydrostatic and hydrodynamic bearing, the second hydrostatic and hydrodynamic bearing and the second rolling bearing is disposed with between the outer wall of described main shaft and the inwall of described main shaft; The exterior side surface of described first hydrostatic and hydrodynamic bearing and described second hydrostatic and hydrodynamic bearing all has the also mutually through hydraulic pressure oil groove of twice annular, and lateral interior surfaces all has multiple wedge shape oil pocket, and multiple described wedge shape oil pocket is all communicated with described hydraulic pressure oil groove; Oil input channel and oil road is provided with in described main shaft, enter the pressure oil in described oil input channel, described first hydrostatic and hydrodynamic bearing and described second hydrostatic and hydrodynamic bearing is entered from described hydraulic pressure oil groove, and overflow from the gap, precision-fit face of described first hydrostatic and hydrodynamic bearing and described second hydrostatic and hydrodynamic bearing and described main shaft and become low pressure oil, low pressure oil enters described oil road and carries out sufficient lubrication to described first rolling bearing and described second rolling bearing.
Wherein, in above-mentioned quiet dynamic pressure spindle, in described first rolling bearing and described second rolling bearing one of be radial force bearing, another is angular contact bearing.
Wherein, in above-mentioned quiet dynamic pressure spindle, described radial force bearing is roller bearing.
Wherein, in above-mentioned quiet dynamic pressure spindle, described angular contact bearing is the angular contact bearing of bidirectional propulsion, and inside and outside it, both sides are separately installed with bearing outer ring spacer and bearing inner race tight fixed ring.
Wherein, in above-mentioned quiet dynamic pressure spindle, described main shaft is also provided with the first oil sealing end cap and the second oil sealing end cap of corresponding described first rolling bearing and described second rolling bearing respectively, in described first oil sealing end cap and described second oil sealing end cap, the first oil sealing and the second oil sealing is housed respectively.
Wherein, in above-mentioned quiet dynamic pressure spindle, in described hydraulic pressure oil groove, be provided with multiple fuel economizer, the corresponding described wedge shape oil pocket of each described fuel economizer, and each described fuel economizer all have the oilhole that is communicated with corresponding wedge shape oil pocket.
Wherein, in above-mentioned quiet dynamic pressure spindle, described main shaft is provided with inflow pipeline and flowline, described inflow pipeline is communicated with described oil input channel, and described flowline is communicated with described oil road.
Three, the beneficial effects of the utility model
Compared with prior art, the quiet dynamic pressure spindle of one of the present utility model, adopt the quiet dynamic pressure spindle of rolling bearing guide and enhancing, ensure that main shaft starting and stopping, oil path failure and overwork time main shaft do not overlap contact friction with hydrostatic and hydrodynamic bearing, safe and reliable when main shaft is worked, short time oil-break also can not cause main shaft to damage.
Rub owing to ensure that main shaft does not operationally overlap with hydrostatic and hydrodynamic bearing, hydrostatic and hydrodynamic bearing cover can adopt steel to make, and reduces cost of material, also makes the thermal coefficient of expansion of main shaft material therefor basically identical.Traditional quiet dynamic pressure spindle rubs owing to can not ensure that main shaft does not overlap with hydrostatic and hydrodynamic bearing, so hydrostatic and hydrodynamic bearing cover will adopt valuable tin bronze material manufacture mostly, reduce wear to reduce friction factor, but when main shaft exceedes temperature rise or friction occurs, because the thermal coefficient of expansion of copper material and steel is different, easily there is seize and even damage.
Rolling bearing is combined with both hydrostatic and hydrodynamic bearings by the utility model, combine the advantage of the two preferably, overcome its deficiency, reduce user cost, expand application area, the manufacture for high-speed, high precision long lifetime miniature precision main shaft provides one and preferably selects.
Accompanying drawing explanation
Fig. 1 is the structural representation of the quiet dynamic pressure spindle of the utility model embodiment;
Fig. 2 is the structural representation of the first hydrostatic and hydrodynamic bearing in Fig. 1;
Fig. 3 is the structural representation of the second hydrostatic and hydrodynamic bearing in Fig. 1;
Wherein:
1 is main shaft; 2 is oil input channel; 3 is inflow pipeline; 4 is the second hydrostatic and hydrodynamic bearing; 5 is the first hydrostatic and hydrodynamic bearing; 6 is plug; 7 is rubber seal; 8 is the first oil sealing; 9 is the first oil sealing end cap; 10 is the first rolling bearing; 11 is oil road; 12 is flowline; 13 is bearing outer ring spacer; 14 is the second rolling bearing; 15 is bearing inner race tight fixed ring; 16 is the second oil sealing end cap; 17 is main shaft; 18 is the second oil sealing; 19 is accurate locknut; 20 is screw; 21 is hydraulic pressure oil groove; 22 is wedge shape oil pocket; 23 is fuel economizer; 24 is oilhole.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but can not be used for limiting scope of the present utility model.
The structure of the quiet dynamic pressure spindle of the present embodiment comprises as shown in Figure 1 to Figure 3: main shaft 1 and the main shaft 17 be matched with in main shaft 1.The first rolling bearing 10, first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4 and the second rolling bearing 14 is disposed with between the outer wall of main shaft 17 and the inwall of main shaft 1.When main shaft 17 starting and stopping or oil path failure not yet effectively set up quiet dynamic pressure effect, first rolling bearing 10 and the second rolling bearing 14 shoulder guide's positioning action, ensure main shaft 17 not with the first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4 internal surface contact friction; When main shaft 17 normally works, the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4 hold the quiet dynamic pressure oil film carrying working load of the precision of formation, and the first rolling bearing 10 and the second rolling bearing 14 do not bear load comparatively greatly substantially due to play.
Specifically, first rolling bearing 10 and the first hydrostatic and hydrodynamic bearing 5 are positioned at the front end of main shaft 17, second rolling bearing 14 and the second hydrostatic and hydrodynamic bearing 4 are positioned at the rear end of main shaft 17, the front-end and back-end of main shaft 1 are provided with the first oil sealing end cap 9 and the second oil sealing end cap 16 of corresponding first rolling bearing 10 and the second rolling bearing 14 respectively, first oil sealing end cap 9 and the second oil sealing end cap 16 all adopt screw 20 to be connected with main shaft 1, and and between main shaft 1, adopt " O " shape rubber seal 7 to seal, and in the first oil sealing end cap 9 and the second oil sealing end cap 16, first oil sealing 8 and the second oil sealing 18 is housed respectively.The exterior side surface of the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4 all has the also mutually through hydraulic pressure oil groove 21 of twice annular, lateral interior surfaces all has multiple wedge shape oil pocket 22, multiple wedge shape oil pocket 22 is all communicated with hydraulic pressure oil groove 21, multiple fuel economizer 23 is provided with in hydraulic pressure oil groove 21, the corresponding wedge shape oil pocket 22 of each fuel economizer 23, and each fuel economizer 23 all has the oilhole 24 that is communicated with corresponding wedge shape oil pocket 22.Accordingly, main shaft 1 is provided with inflow pipeline 3 and flowline 12, oil input channel 2 and oil road 11 is processed with in the body of main shaft 1, inflow pipeline 3 is communicated with oil input channel 2, flowline 12 is communicated with oil road 11, auxiliary hole plug 6 during processing oil duct blocks, main shaft 1 oil duct is closed, and make to enter the pressure oil in oil input channel 2, the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4 is entered from hydraulic pressure oil groove 21, and to overflow with the gap, precision-fit face of main shaft 17 from the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4 and become low pressure oil, low pressure oil enters oil road 11 and carries out sufficient lubrication to the first rolling bearing 10 and the second rolling bearing 14, the life-span of the first rolling bearing 10 and the second rolling bearing 14 is made greatly to extend like this.When main shaft 17 operating instant load exceeds the bearing capacity of the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4, the first rolling bearing 10 and the second rolling bearing 14 can strengthen main shaft rigidity by bearing load.
During work, hydraulic oil enters in the hydraulic pressure oil groove 21 of the bearing housing outer surface of the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4 by the inflow pipeline 3 of main shaft 1, oil input channel 2, fuel economizer 23 becomes accurate Spielpassung with main shaft 1 bore design, by the wedge shape oil pocket 22 of hydraulic oil in the bearing housing that oilhole 24 enters the first hydrostatic and hydrodynamic bearing 5 and the second hydrostatic and hydrodynamic bearing 4 on the precision gap surface of flow controller 23.In this process, the hydraulic oil of deriving from outside acts on through flow controller 23 and first in main shaft 17 and the first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4, produces the static pressure oil film with bearing capacity between fitting surface, after main shaft 17 rotates and reaches certain rotating speed, because viscoelasticity effect drives the hydraulic oil in wedge shape oil pocket 22 to form the dynamic pressure oil film with bearing capacity, the quiet dynamic pressure spindle 17 high-speed, high precision motion of the two effect superposition supporting.Like this, owing to there is quiet dynamic pressure oil film between main shaft 17 and the internal surface of the first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4, the homogenizing error effect of oil film makes main shaft 17 possess very high kinematic accuracy, sufficient film lubrication also allows main shaft 17 to use higher rotating speed, and main shaft 17 vibrates also less.And due to the existence of oil film, main shaft 17 does not contact with the bearing housing of the first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4, therefore also there is not mechanical wear, and then improves the operating life of main shaft 17.
During installation, first the first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4 is closely cooperated and press-fit in main shaft 1, main shaft 17 is pushed in the bearing housing of the first hydrostatic and hydrodynamic bearing 5, second hydrostatic and hydrodynamic bearing 4; Then install the first rolling bearing 10 of radial force in the front end of main shaft 17, what install in the present embodiment is single row roller bearing, possesses good radial rigidity and precision; Then installation can bear the second rolling bearing 14 of axial force in the rear end of main shaft 17, what install in the present embodiment is the angular contact bearing of bidirectional propulsion, therefore must installation shaft bearing outer-ring spacer 13, bearing inner race tight fixed ring 15 and accurate locknut 19, second rolling bearing 14 is fixed on main shaft 17 and main shaft 1, main shaft 17 is made to possess higher axial rigidity and precision, when main shaft 17 needs higher axial precision and rigidity, the angular contact bearing as fixed end being installed on main shaft 17 rear end can bear this partial function well; Finally the first oil sealing 8 and the second oil sealing 18 being coordinated respectively press-fits on the first oil sealing end cap 9 and the second oil sealing end cap 16, and be embedded in " O " shape rubber seal 7 at the groove of the first oil sealing end cap 9 and the second oil sealing end cap 16, with screw 20, oil sealing end cap assembly parts is anchored on main shaft 1.
As mentioned above, the quiet dynamic pressure spindle of one of the present utility model, adopt the quiet dynamic pressure spindle of rolling bearing guide and enhancing, ensure that main shaft starting and stopping, oil path failure and overwork time main shaft do not overlap contact friction with hydrostatic and hydrodynamic bearing, safe and reliable when main shaft is worked, short time oil-break also can not cause main shaft to damage.
Rub owing to ensure that main shaft does not operationally overlap with hydrostatic and hydrodynamic bearing, hydrostatic and hydrodynamic bearing cover can adopt steel to make, and reduces cost of material, also makes the thermal coefficient of expansion of main shaft material therefor basically identical.Traditional quiet dynamic pressure spindle rubs owing to can not ensure that main shaft does not overlap with hydrostatic and hydrodynamic bearing, so hydrostatic and hydrodynamic bearing cover will adopt valuable tin bronze material manufacture mostly, reduce wear to reduce friction factor, but when main shaft exceedes temperature rise or friction occurs, because the thermal coefficient of expansion of copper material and steel is different, easily there is seize and even damage.
Rolling bearing is combined with both hydrostatic and hydrodynamic bearings by the utility model, combine the advantage of the two preferably, overcome its deficiency, reduce user cost, expand application area, the manufacture for high-speed, high precision long lifetime miniature precision main shaft provides one and preferably selects.
Below be only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (7)
1. a quiet dynamic pressure spindle, is characterized in that, described quiet dynamic pressure spindle comprises: main shaft (1) and the main shaft (17) be matched with in described main shaft (1), the first rolling bearing (10), the first hydrostatic and hydrodynamic bearing (5), the second hydrostatic and hydrodynamic bearing (4) and the second rolling bearing (14) is disposed with between the outer wall of described main shaft (17) and the inwall of described main shaft (1), the exterior side surface of described first hydrostatic and hydrodynamic bearing (5) and described second hydrostatic and hydrodynamic bearing (4) all has the also mutually through hydraulic pressure oil groove (21) of twice annular, lateral interior surfaces all has multiple wedge shape oil pocket (22), and multiple described wedge shape oil pocket (22) is all communicated with described hydraulic pressure oil groove (21), oil input channel (2) and oil road (11) is provided with in described main shaft (1), enter the pressure oil in described oil input channel (2), described first hydrostatic and hydrodynamic bearing (5) and described second hydrostatic and hydrodynamic bearing (4) is entered from described hydraulic pressure oil groove (21), and to overflow with the gap, precision-fit face of described main shaft (17) from described first hydrostatic and hydrodynamic bearing (5) and described second hydrostatic and hydrodynamic bearing (4) and become low pressure oil, low pressure oil enters described oil road (11) and carries out sufficient lubrication to described first rolling bearing (10) and described second rolling bearing (14).
2. quiet dynamic pressure spindle according to claim 1, is characterized in that, in described first rolling bearing (10) and described second rolling bearing (14) one of be radial force bearing, another is angular contact bearing.
3. quiet dynamic pressure spindle according to claim 2, is characterized in that, described radial force bearing is roller bearing.
4. quiet dynamic pressure spindle according to claim 3, is characterized in that, described angular contact bearing is the angular contact bearing of bidirectional propulsion, and inside and outside it, both sides are separately installed with bearing outer ring spacer (13) and bearing inner race tight fixed ring (15).
5. quiet dynamic pressure spindle according to claim 2, it is characterized in that, described main shaft (1) is provided with the first oil sealing end cap (9) and the second oil sealing end cap (16) of corresponding described first rolling bearing (10) and described second rolling bearing (14) respectively, in described first oil sealing end cap (9) and described second oil sealing end cap (16), the first oil sealing (8) and the second oil sealing (18) is housed respectively.
6. quiet dynamic pressure spindle according to any one of claim 1 to 5, it is characterized in that, multiple fuel economizer (23) is provided with in described hydraulic pressure oil groove (21), the corresponding described wedge shape oil pocket (22) of each described fuel economizer (23), and each described fuel economizer (23) all has the oilhole (24) that is communicated with corresponding wedge shape oil pocket (22).
7. quiet dynamic pressure spindle according to claim 6, it is characterized in that, described main shaft (1) is provided with inflow pipeline (3) and flowline (12), described inflow pipeline (3) is communicated with described oil input channel (2), and described flowline (12) is communicated with described oil road (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520732012.3U CN205025934U (en) | 2015-09-21 | 2015-09-21 | Quiet dynamic pressure main shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520732012.3U CN205025934U (en) | 2015-09-21 | 2015-09-21 | Quiet dynamic pressure main shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205025934U true CN205025934U (en) | 2016-02-10 |
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ID=55258468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520732012.3U Expired - Fee Related CN205025934U (en) | 2015-09-21 | 2015-09-21 | Quiet dynamic pressure main shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205025934U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179482A (en) * | 2015-09-21 | 2015-12-23 | 宁波朗曼达工具有限公司 | Static-dynamic pressure main shaft |
| CN111623038A (en) * | 2020-07-06 | 2020-09-04 | 德本恒嘉精机(昆山)有限公司 | Ultrahigh-precision hydrostatic bearing |
-
2015
- 2015-09-21 CN CN201520732012.3U patent/CN205025934U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179482A (en) * | 2015-09-21 | 2015-12-23 | 宁波朗曼达工具有限公司 | Static-dynamic pressure main shaft |
| CN111623038A (en) * | 2020-07-06 | 2020-09-04 | 德本恒嘉精机(昆山)有限公司 | Ultrahigh-precision hydrostatic bearing |
| CN111623038B (en) * | 2020-07-06 | 2023-08-29 | 德本恒嘉精机(昆山)有限公司 | Ultra-high precision hydrostatic bearing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160210 Termination date: 20170921 |
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| CF01 | Termination of patent right due to non-payment of annual fee |