CN114321191B - Static pressure main shaft axial fixing structure - Google Patents
Static pressure main shaft axial fixing structure Download PDFInfo
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- CN114321191B CN114321191B CN202111531818.2A CN202111531818A CN114321191B CN 114321191 B CN114321191 B CN 114321191B CN 202111531818 A CN202111531818 A CN 202111531818A CN 114321191 B CN114321191 B CN 114321191B
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- 230000003068 static effect Effects 0.000 title claims description 29
- 238000001816 cooling Methods 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 abstract description 40
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
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Abstract
The invention belongs to the technical field of hydrostatic bearings, and discloses a hydrostatic spindle axial fixing structure, which comprises a spindle, a pressure pump, a box body fixedly arranged outside the spindle and an oil inlet hole formed in the box body, wherein front bearings and rear bearings are respectively fixedly arranged at the front end and the rear end of two ends of the box body. According to the invention, the first step end face, the first throttling edge, the second throttling edge and the second step end face of the rear bearing of the main shaft are arranged to form an end face gap together, and pressure oil is forcedly pumped into the end face gap, so that the original two end face throttling cavities are concentrated to one place to form an end face throttling cavity and a double radial throttling edge, the positions are dispersed in the front and the rear, the condition of heating locking of the main shaft can be greatly improved, and the gap width between the step end face of the bearing and the step end face of the main shaft is 0.5-1mm, so that the size is easy to process, the processing difficulty is greatly reduced, and the processing efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of hydrostatic bearings, and particularly relates to an axial fixing structure of a hydrostatic spindle.
Background
Hydrostatic bearings are a type of plain bearing, which uses pressure to forcibly pump pressurized oil into the gap between the bearing and the shaft.
The hydrostatic bearing commonly used in the lathe, its front and back bearing is fixed on the box, the inlet port that sets up on the box communicates the annular on the outer circle of front and back bearing, makes the pressure oil get into the bearing inner chamber through the aperture of seting up on the annular, forms oil film cladding main shaft rotation to the location between main shaft and the bearing of prior art is realized like this: the end cover of the spindle shaft shoulder and the front bearing are positioned, an end surface static pressure oil cavity is arranged on the end surface of the end cover, the front bearing is attached to the shaft shoulder, pressure oil is filled in the oil cavity to form an oil film during working, the axial positioning function of the end surface bearing is achieved, the width dimension of the spindle shaft shoulder and the gap between the end cover and the end surface static pressure oil cavity on the front bearing are adjusted by adopting an adjusting pad, when the spindle shaft shoulder is matched with the end surface static pressure oil cavity, the gap can reach a designed ideal value, the spindle is a high-speed rotating part, the precision is high, in order to realize normal working according to the design requirement, the precision of the matched part is required to be strictly controlled, the adjusting pad is required to be matched during processing, the precision is usually measured in a level of 0.01mm or below, the processing difficulty is high, the efficiency is low, and besides, the radial static pressure oil cavity and the end surface static pressure oil cavity are concentrated, when the spindle rotates at a high speed, the precision is easy to lose after the material meat expands, and the spindle is locked.
Aiming at the problems, the invention provides a novel static pressure main shaft axial fixing structure which can effectively solve the problems, and can cool pressure oil in a static pressure bearing through heat exchange to reduce the loss of precision caused by thermal expansion and cold contraction.
Disclosure of Invention
The invention aims to provide an axial fixing structure of a static pressure main shaft, which is used for solving the problems in the background technology.
In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a static pressure main shaft axial fixing structure, includes main shaft, force pump, fixed mounting in the outside box of main shaft and open the inlet port on the box, both ends are fixed mounting respectively in front and back of the both ends of box have preceding bearing and rear bearing, the static pressure oil pocket has been seted up with the terminal surface in opposite directions of main shaft front end step face on the preceding bearing, enclose into the terminal surface clearance jointly between the first step terminal surface of main shaft rear end, first throttle limit, second throttle limit and the second step terminal surface of rear bearing, the terminal surface clearance is pumped into the pressure oil through inlet port and first throttle limit, so be full of between first step terminal surface and the second step terminal surface and press oil, the oil pressure can give main shaft terminal surface thrust, give main shaft terminal surface supporting effect, form the terminal surface bearing;
The two original end face throttling cavities are concentrated to one place to form an end face throttling cavity and a double radial throttling edge, and the positions are dispersed in the front and the back, so that the heating and locking condition of the main shaft can be greatly improved.
Preferably, the gap width of the rear end face gap of the rear bearing in place is 0.5-1mm;
the width range is larger, the processing is carried out according to the design size, the tie width within the range can be easily obtained, the grinding is reduced, and the processing difficulty is greatly reduced.
Preferably, oil drain holes are formed in two ends of the box body and are communicated with the end face gap and the static pressure oil cavity, an oil drain valve is fixedly arranged outside the box body and is communicated with the oil drain hole, the pressure pump pumps pressure oil in the oil tank into the oil inlet hole through a throttle valve, the oil drain valve is communicated with the cooling device, and the outlet end of the cooling device is communicated to the oil tank;
For example, the pressure oil in the static pressure oil cavity or the end surface gap and the like can be finally discharged from the oil discharge hole through the oil discharge valve, the heat of the static pressure bearing is taken out, the taken pressure oil enters the cooling device for cooling, the cooled pressure oil flows back into the oil tank, and the normal temperature pressure oil in the oil tank is pumped into the static pressure bearing through the pressure pump for heat exchange, so that the heat dissipation effect is achieved on the static pressure bearing.
Preferably, the oil drain valve comprises a valve seat fixedly mounted outside the tank body, an oil pipe fixedly communicated with the valve seat fixed opening, a branch pipe fixedly mounted on the side surface of the valve seat, a threaded pin screwed on the inner side of the branch pipe, a rotating rod movably clamped on the inner side of the threaded pin, a motor connected with the transmission of the rotating rod, an output end of the oil pipe communicated with the cooling device, and pressure oil in the hydrostatic bearing discharged to the outside through the oil pipe and then cooled by the cooling device enters the oil tank, so that the pressure oil pumped in the oil tank can be always kept at a lower temperature.
Preferably, the threaded pin comprises a pin shaft arranged at the right end of the threaded pin, the right end of the pin shaft penetrates through the valve seat and extends into the valve seat, and the pin shaft slides rightwards to stop a vertical oil path at the inner side of the valve seat;
The pin shaft can open the oil path so as to discharge the pressure oil in the hydrostatic bearing, and can still maintain the oil pressure in the hydrostatic bearing, and the gap width of the oil path is controllable, and the pressure oil has the characteristic of incompressible, so that the pressure oil can be forced to be pushed out along the oil path after being pumped into the hydrostatic bearing, but the pressure oil capacity discharged in unit time is constant under the given gap size and pressure because the width of the oil path is given, and the discharge speed of the pressure oil is increased along with the increase of the pressure, so that the pressure of the pressure pump oil is increased, and the pressure oil pressure in the hydrostatic bearing can be maintained, thereby not only playing the role of oil change, but also playing the role of maintaining the pressure oil pressure in the hydrostatic bearing, and further maintaining the stable operation.
Preferably, a protruding clamping strip is arranged on the surface of one end of the rotating rod extending to the inside of the threaded pin, a clamping groove matched with the clamping strip is formed in the inner side of the threaded pin, and when the rotating rod is inserted into the inner side of the threaded pin, the clamping strip is clamped in the clamping groove of the threaded pin;
The structure of the rotating rod is matched with the inner side structure of the threaded pin, the rotating rod can slide along the axial direction at the inner side of the threaded pin, but when the rotating rod rotates, the rotating rod can drive the threaded pin to rotate together, the threaded pin and the branch pipe are in threaded connection, the threaded pin can move along the axial direction of the branch pipe when rotating, so that the pin shaft is driven to move in the valve seat, a vertical oil way in the valve seat can be obviously blocked or opened through the pin shaft, the gap width of the opened oil way in the valve seat can be regulated through regulating the displacement length of the pin shaft, the larger the opened gap width is, the faster the circulation speed of pressure oil in unit time is, the macroscopic concrete expression is that the oil change speed of the hydrostatic bearing is accelerated, the opposite cooling effect is obvious, but after the oil way gap of the valve seat is opened greatly, the release of the pressure oil in the hydrostatic bearing is also obvious, the process of opening the oil way gap and the gap of the valve seat can obviously cut off or open, the corresponding large pressure of the hydrostatic bearing is ensured to be always equal to the internal hydrostatic pressure of the hydrostatic bearing.
Preferably, the cooling device is a pressure oil cooler;
The pressure oil entering the pressure oil cooler through the oil pipe can be rapidly cooled and then is output and returned to the oil tank, namely the pressure oil stored in the oil tank is normal-temperature or intersected-bottom pressure oil, the pressure oil collected by the pressure pump from the oil tank is relatively low in temperature, the temperature of the intersected-bottom pressure oil can be effectively reduced or maintained after the intersected-bottom pressure oil is pumped into the hydrostatic bearing, or the temperature rising speed is reduced, and the expansion and contraction phenomenon of the hydrostatic bearing material is relieved by reducing the temperature.
The beneficial effects of the invention are as follows:
1. According to the invention, the first step end face, the first throttling edge, the second throttling edge and the second step end face of the rear bearing of the main shaft are arranged to form an end face gap together, and pressure oil is forcedly pumped into the end face gap, so that the original two end face throttling cavities are concentrated to one place to form an end face throttling cavity and a double radial throttling edge, the positions are dispersed in the front and the rear, the condition of heating locking of the main shaft can be greatly improved, and the gap width between the step end face of the bearing and the step end face of the main shaft is 0.5-1mm, so that the size is easy to process, the processing difficulty is greatly reduced, and the processing efficiency is improved.
2. According to the invention, the cooling system is arranged, the pressure oil in the hydrostatic bearing is led out, the pressure oil flows back to the oil tank after being cooled by the cooling system, and the pressure oil cooled to normal temperature is pumped into the hydrostatic bearing again by the pressure pump, so that the internal heat exchange of the hydrostatic bearing has an effective cooling effect, and the influence of the precision of the internal part of the hydrostatic bearing due to thermal expansion is relieved.
3. The invention can open the oil path through the driving pin shaft so as to discharge the pressure oil in the hydrostatic bearing, and can still maintain the oil pressure in the hydrostatic bearing.
Drawings
FIG. 1 is a schematic cross-sectional view of a hydrostatic bearing of the present invention;
FIG. 2 is an enlarged schematic view of portion B of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged schematic view of portion A of FIG. 1 in accordance with the present invention;
FIG. 4 is an overall schematic view of a hydrostatic bearing of the present invention;
FIG. 5 is a schematic cross-sectional view of an oil drain valve of the present invention;
FIG. 6 is a schematic view of an oil circuit according to the present invention;
Fig. 7 is a schematic view showing the threaded pin and the rotating rod of the present invention disassembled.
In the figure: 1. a main shaft; 101. a first step end face; 102. a first throttle edge; 103. a second throttling edge; 2. a case; 3. a front bearing; 31. static pressure oil cavity; 4. a rear bearing; 401. a second step end face; 5. an oil inlet hole; 6. an oil drain hole; 7. end face clearance; 8. an oil discharge valve; 801. A valve seat; 802. a branch pipe; 803. a threaded pin; 8031. a pin shaft; 804. an oil pipe; 805. A rotating lever; 9. a motor; 10. a cooling device; 11. a pressure pump; 12. a throttle valve; 13. And an oil tank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 7, in the embodiment of the present invention, a static pressure spindle axial fixing structure includes a spindle 1, a pressure pump 11, a box 2 fixedly installed outside the spindle 1, and an oil inlet 5 opened on the box 2, wherein front bearings 3 and rear bearings 4 are respectively fixedly installed at front and rear ends of two ends of the box 2, a static pressure oil cavity 31 is opened on an opposite end face of a front bearing 3 to a front end step face of the spindle 1, an end face gap 7 is defined between a first step end face 101, a first throttling edge 102, a second throttling edge 103 and a second step end face 401 of the rear bearing 4 of the spindle 1, and the end face gap 7 is pumped with pressure oil through the oil inlet 5 and the first throttling edge 102, so that the space between the first step end face 101 and the second step end face 401 is filled with pressure oil, the pressure oil gives thrust to the spindle end face, and the end face support effect of the spindle is provided, so that an end face bearing is formed;
The two original end face throttling cavities are concentrated to one place to form an end face throttling cavity and a double radial throttling edge, and the positions are dispersed in the front and the back, so that the heating and locking condition of the main shaft can be greatly improved.
Wherein, the gap width of the rear end face gap 7 of the rear bearing 4 in place is 0.5-1mm;
the width range is larger, the processing is carried out according to the design size, the tie width within the range can be easily obtained, the grinding is reduced, and the processing difficulty is greatly reduced.
The two ends of the box body 2 are respectively provided with an oil drain hole 6, the oil drain holes 6 are communicated with the end face gaps 7 and the static pressure oil cavity 31, an oil drain valve 8 is fixedly arranged outside the box body 2, the oil drain valve 8 is communicated with the oil drain holes 6, a pressure pump 11 pumps pressure oil in an oil tank 13 into the oil inlet hole 5 through a throttle valve 12, the oil drain valve 8 is communicated with a cooling device 10, and the outlet end of the cooling device 10 is communicated to the oil tank 13;
For example, the pressure oil in the static pressure oil cavity 31 or the end surface gap 7 and the like can be finally discharged from the oil discharge hole 6 through the oil discharge valve 8, the heat of the static pressure bearing is carried out, the carried pressure oil enters the cooling device 10 for cooling, the cooled pressure oil flows back into the oil tank 13, and the normal temperature pressure oil in the oil tank 13 is pumped into the static pressure bearing through the pressure pump 11 for heat exchange, so that the heat dissipation effect is achieved on the static pressure bearing.
The oil drain valve 8 comprises a valve seat 801 fixedly mounted outside the box body 2, an oil pipe 804 fixedly communicated with a fixed opening of the valve seat 801, a branch pipe 802 fixedly mounted on the side surface of the valve seat 801, a threaded pin 803 screwed on the inner side of the branch pipe 802, a rotating rod 805 movably clamped on the inner side of the threaded pin 803, a motor 9 connected with the transmission of the rotating rod 805, an output end of the oil pipe 804 communicated with the cooling device 10, and pressure oil in the hydrostatic bearing discharged to the outside through the oil pipe 804 and then cooled by the cooling device 10 and then enters the oil tank 13, so that the pressure oil pumped from the oil tank 13 can be always kept low in temperature.
The threaded pin 803 comprises a pin 8031 arranged at the right end of the threaded pin 803, the right end of the pin 8031 penetrates through the valve seat 801 to extend into the valve seat 801, and the pin 8031 slides rightwards to stop a vertical oil path at the inner side of the valve seat 801;
The pin 8031 can open the oil path so as to drain the pressure oil in the hydrostatic bearing, and can still maintain the oil pressure in the hydrostatic bearing, and because the gap width of the oil path opened by the pin 8031 is controllable, and the pressure oil has the characteristic of incompressible, the pressure oil can be forced out along the oil path after being pumped into the hydrostatic bearing, but because the width of the oil path opened is determined, the volume of the pressure oil drained in unit time is constant under the determined gap size and pressure, and the draining speed of the pressure oil is increased along with the increase of the pressure, the pressure of the oil pumped by the pressure pump 11 is increased, and meanwhile, the pressure oil pressure in the hydrostatic bearing can be maintained, so that the oil changing effect can be achieved, the pressure of the pressure oil in the hydrostatic bearing can be maintained, and the stable operation can be maintained.
Wherein, one end surface of the rotating rod 805 extending to the inside of the threaded pin 803 is provided with a protruding clamping strip, the inner side of the threaded pin 803 is provided with a clamping groove matched with the clamping strip, and when the rotating rod 805 is inserted into the inner side of the threaded pin 803, the clamping strip is clamped in the clamping groove of the threaded pin 803;
The structure of the rotating rod 805 is matched with the inner side structure of the threaded pin 803, the rotating rod 805 can slide along the axial direction on the inner side of the threaded pin 803, but when the rotating rod 805 rotates, the rotating rod can inevitably drive the threaded pin 803 to rotate together, the threaded pin 803 and the branch pipe 802 are in threaded connection, the threaded pin 803 moves along the axial direction of the branch pipe 802 when rotating, so as to drive the pin 8031 to move in the valve seat 801, obviously, the vertical oil way in the valve seat 801 can be blocked or opened through the pin 8031, the gap width of the opened oil way in the valve seat 801 can be regulated by regulating the displacement length of the pin shaft 8031, and the larger the gap width of the opened oil way is, the faster the circulation speed of the pressure oil in unit time is, the more obvious the oil change speed of the hydrostatic bearing is realized, the relative cooling effect is obvious, but after the gap of the valve seat 801 is opened, the release of the pressure oil in the hydrostatic bearing is also obvious, the gap is obviously required to be opened in the corresponding oil way, the gap width of the valve seat 801 is required to be opened, the equal to the pressure of the internal pressure of the hydrostatic bearing is ensured, the oil is always to be increased, and the pressure of the internal pressure of the hydrostatic bearing is ensured to be increased, and the internal pressure of the hydrostatic bearing is ensured to be equal to the internal pressure of the corresponding pressure of the valve seat 11.
Wherein the cooling device 10 is a pressure oil cooler;
The pressure oil entering the pressure oil cooler through the oil pipe 804 is rapidly cooled and then is output and returned to the oil tank 13, that is, the pressure oil stored in the oil tank 13 is pressure oil with normal temperature or with a temperature at the bottom, the pressure oil collected by the pressure pump 11 from the oil tank 13 is relatively low in temperature, and the temperature of the pressure oil with the temperature at the bottom can be effectively reduced or maintained after the pressure oil with the temperature at the bottom is pumped into the hydrostatic bearing, or the speed of temperature rising is reduced, and the expansion and contraction phenomenon of the hydrostatic bearing material is relieved by reducing the temperature.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The utility model provides a static pressure main shaft axial fixing structure, includes main shaft (1), force pump (11), fixed mounting in outside box (2) of main shaft (1) with set up in inlet port (5) on box (2), both ends are fixed mounting has preceding bearing (3) and back bearing (4) respectively around the both ends of box (2), its characterized in that: a static pressure oil cavity (31) is formed in the front bearing (3) and opposite to the step surface of the front end of the main shaft (1), a first step end surface (101) of the rear end of the main shaft (1), a first throttling edge (102), a second throttling edge (103) and a second step end surface (401) of the rear bearing (4) are jointly enclosed to form an end surface gap (7), the end surface gap (7) is pumped into pressure oil through an oil inlet hole (5) and then respectively passes through the first throttling edge (102) and the second throttling edge (103), the gap width of the rear bearing (4) mounted to the rear end surface gap (7) is 0.5-1mm, oil drain holes (6) are formed in two ends of the box (2) and are communicated with the end surface gap (7) and the static pressure oil cavity (31), an oil drain valve (8) is fixedly mounted outside the box (2) and is communicated with the oil drain hole (6), and the pressure oil pump (11) is communicated with the oil drain hole (10) through the pressure pump (13) to the cooling device (10; the oil drain valve (8) comprises a valve seat (801) fixedly mounted on the outside of the box body (2), an oil pipe (804) fixedly communicated with the valve seat (801) and provided with an opening, a branch pipe (802) fixedly mounted on the side surface of the valve seat (801), a threaded pin (803) screwed on the inner side of the branch pipe (802), a rotating rod (805) movably clamped on the inner side of the threaded pin (803), a motor (9) is connected to the transmission of the rotating rod (805), the output end of the oil pipe (804) is communicated with the cooling device (10), the threaded pin (803) comprises a pin shaft (8031) arranged on the right end of the threaded pin, the right end of the pin shaft (8031) penetrates through the valve seat (801) to extend into the valve seat (801), a vertical oil way on the inner side of the valve seat (801) is blocked, a clamping groove matched with the clamping groove is formed in the inner side of the threaded pin (803), and the clamping groove is formed in the inner side of the threaded pin (803) when the rotating rod (805) is inserted into the clamping groove (803).
2. The static pressure spindle axial fixing structure according to claim 1, wherein: the cooling device (10) is a pressure oil cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111531818.2A CN114321191B (en) | 2022-01-26 | 2022-01-26 | Static pressure main shaft axial fixing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111531818.2A CN114321191B (en) | 2022-01-26 | 2022-01-26 | Static pressure main shaft axial fixing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114321191A CN114321191A (en) | 2022-04-12 |
| CN114321191B true CN114321191B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111531818.2A Active CN114321191B (en) | 2022-01-26 | 2022-01-26 | Static pressure main shaft axial fixing structure |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH434892A (en) * | 1963-07-16 | 1967-04-30 | Toyota Koki Kabushiki Kaisha | Device for applying a preload to a bearing of a rotating machine shaft |
| CN201944119U (en) * | 2011-01-26 | 2011-08-24 | 江西杰克机床有限公司 | Static-pressure bearing with internal-feedback throttling return oil |
| CN103659587A (en) * | 2013-12-04 | 2014-03-26 | 西安交通大学苏州研究院 | Axial-locking prevention static pressure main shaft structure of radial thrust combined bearing support |
| JP2015128800A (en) * | 2014-01-06 | 2015-07-16 | 株式会社ジェイテクト | Main shaft device |
| DE102017124931A1 (en) * | 2017-10-25 | 2019-04-25 | Schaeffler Technologies AG & Co. KG | Hydraulic system for the hydraulic actuation of switching elements of switchable valve trains and throttle valve |
| CN110614386A (en) * | 2019-09-19 | 2019-12-27 | 森合(天津)科技有限公司 | High-precision hydrostatic pressure spindle |
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2022
- 2022-01-26 CN CN202111531818.2A patent/CN114321191B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH434892A (en) * | 1963-07-16 | 1967-04-30 | Toyota Koki Kabushiki Kaisha | Device for applying a preload to a bearing of a rotating machine shaft |
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| CN103659587A (en) * | 2013-12-04 | 2014-03-26 | 西安交通大学苏州研究院 | Axial-locking prevention static pressure main shaft structure of radial thrust combined bearing support |
| JP2015128800A (en) * | 2014-01-06 | 2015-07-16 | 株式会社ジェイテクト | Main shaft device |
| DE102017124931A1 (en) * | 2017-10-25 | 2019-04-25 | Schaeffler Technologies AG & Co. KG | Hydraulic system for the hydraulic actuation of switching elements of switchable valve trains and throttle valve |
| CN110614386A (en) * | 2019-09-19 | 2019-12-27 | 森合(天津)科技有限公司 | High-precision hydrostatic pressure spindle |
| CN111070091A (en) * | 2019-12-25 | 2020-04-28 | 广州市昊志机电股份有限公司 | Movable center tailstock, tailstock system and machine tool |
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| Title |
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| CN114321191A (en) | 2022-04-12 |
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