CN112792363B - Electric spindle and machine tool - Google Patents
Electric spindle and machine tool Download PDFInfo
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- CN112792363B CN112792363B CN202110063601.7A CN202110063601A CN112792363B CN 112792363 B CN112792363 B CN 112792363B CN 202110063601 A CN202110063601 A CN 202110063601A CN 112792363 B CN112792363 B CN 112792363B
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- rear bearing
- cooling medium
- bearing seat
- medium flow
- flow passage
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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
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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
- 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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- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
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Abstract
The invention discloses an electric spindle and a machine tool, comprising: the machine body assembly is provided with a front bearing seat assembly and a rear bearing seat assembly; the front end of the shaft core assembly is supported on the front bearing seat assembly through a front bearing, and the rear end of the shaft core assembly is supported on the rear bearing seat assembly through a rear bearing; the rear bearing seat assembly comprises a rear bearing seat outer sleeve and a rear bearing seat, the rear bearing seat outer sleeve is connected with the machine body assembly, an outer ring of the rear bearing is supported on the rear bearing seat, the rear bearing seat is matched with the rear bearing seat outer sleeve, the rear bearing seat can float relative to the rear bearing seat outer sleeve along the axial direction, a first cooling medium flow channel is arranged on the rear bearing seat outer sleeve, a second cooling medium flow channel is arranged on the rear bearing seat, and the first cooling medium flow channel is communicated with the second cooling medium flow channel; the front bearing block assembly is provided with a third cooling medium flow passage. The rear bearing can achieve the same cooling effect as the front bearing, thereby prolonging the service life of the rear bearing.
Description
Technical Field
The invention is used for the field of turning and boring, and particularly relates to an electric spindle and a machine tool.
Background
The combined machining is realized by several different machining processes such as turning, boring, drilling, milling and the like on one machine tool, is a popular machining process in the field of machining at present, and belongs to the most extensive application of turning and milling combined machining. The workpiece can finish most or all processing procedures such as turning, boring, drilling, milling and the like in one-time clamping, so that the processing precision of parts and the processing efficiency of a machine tool are improved.
The compound electric main shaft of turnning and milling need provide big cutting force, therefore the design demand of motor is high-power big moment of torsion, high-power motor must produce very big heat, this part heat can transmit front and back bearing, make the bearing increase of generating heat, simultaneously because the bearing that this type main shaft used all belongs to the bearing calorific capacity that the height bore is far more than the bearing that ordinary bore, the motor generates heat and makes the temperature sharply increased at bearing position with bearing self generating heat, nevertheless because the bearing of rear end belongs to the floating end bearing, it is difficult to accomplish the cooling effect the same with the front bearing, the life of rear bearing is influenced greatly.
Moreover, because the upper bearing seat and the upper bearing seat outer sleeve have larger temperature difference, the uncooled rear bearing seat expands when heated, and the cooled rear bearing seat outer sleeve shrinks, so that the matching effect is damaged, and the pre-tightening of the bearing is influenced.
In addition, the existing motorized spindle has a long bearing span and cannot meet the length limitation requirement of a turning and milling motorized spindle on a machine tool.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and to provide an electric spindle and a machine tool.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, an electric spindle comprises:
the machine body assembly is provided with a front bearing seat assembly and a rear bearing seat assembly;
the front end of the shaft core assembly is supported on the front bearing seat assembly through a front bearing, and the rear end of the shaft core assembly is supported on the rear bearing seat assembly through a rear bearing;
the rear bearing seat assembly comprises a rear bearing seat outer sleeve and a rear bearing seat, the rear bearing seat outer sleeve is connected with the machine body assembly, an outer ring of the rear bearing is supported on the rear bearing seat, the rear bearing seat is matched with the rear bearing seat outer sleeve, the rear bearing seat can float relative to the rear bearing seat outer sleeve along the axial direction, a first cooling medium flow channel is arranged on the rear bearing seat outer sleeve, a second cooling medium flow channel is arranged on the rear bearing seat, and the first cooling medium flow channel is communicated with the second cooling medium flow channel; the front bearing block assembly is provided with a third cooling medium flow passage.
With reference to the first aspect, in certain implementation manners of the first aspect, the drive device further includes a connecting pipe, the connecting pipe is axially disposed and assembled between the rear bearing seat jacket and the rear bearing seat, the connecting pipe communicates the first cooling medium flow channel and the second cooling medium flow channel, and the connecting pipe is movably matched with the rear bearing seat jacket and/or the rear bearing seat to achieve floating connection.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a first axial insertion hole communicated with the first cooling medium flow passage is sleeved outside the rear bearing seat, a second axial insertion hole communicated with the second cooling medium flow passage is arranged on the rear bearing seat, one end of the connecting pipe is assembled in the first axial insertion hole and is in interference fit with the first axial insertion hole, and the other end of the connecting pipe is assembled in the second axial insertion hole and is in clearance fit with the second axial insertion hole.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the rear bearing block includes a first member and a second member, the first member and the second member are both annular, the first member is located radially inside the rear bearing block outer casing, the second member is located axially behind the rear bearing block outer casing, the connecting pipe is disposed between the second member and the rear bearing block outer casing, and the second cooling medium flow passage is disposed in the first member.
With reference to the first aspect and the implementations described above, in certain implementations of the first aspect, a rolling sleeve is disposed between the rear bearing housing outer sleeve and the first member.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, a second ring groove is formed in the rear end of the first component, the second component is matched with the first component and shields the second ring groove, a third ring groove is formed in the front end of the first component, the rear bearing block further comprises a third component, the third component is matched with the first component and shields the third ring groove, the second ring groove and the third ring groove are communicated through an axial hole, and the second ring groove and the third ring groove form the second cooling medium flow passage.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a first annular groove is formed in an outer wall of the rear bearing seat outer sleeve, the engine body component is matched with the rear bearing seat outer sleeve, and the engine body component shields the first annular groove to form the first cooling medium flow passage.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the machine body assembly is provided with a fourth cooling medium flow passage, the fourth cooling medium flow passage is communicated with the second cooling medium flow passage, the third cooling medium flow passage is communicated with the first cooling medium flow passage, and a cooling medium flows through the third cooling medium flow passage, the first cooling medium flow passage, the second cooling medium flow passage, and the fourth cooling medium flow passage in sequence.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the cooling system further includes a spindle box, a spiral ring groove is formed in an outer peripheral surface of the machine body assembly, the machine body assembly is assembled in the spindle box, the spindle box covers the spiral ring groove to form the fourth cooling medium flow passage, the spindle box is provided with a water inlet communicated with the third cooling medium flow passage, and the spindle box is provided with a water outlet communicated with the fourth cooling medium flow passage.
In a second aspect, a machine tool comprises the electric spindle according to any one of the implementations of the first aspect.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
the front bearing realizes the cooling through the third cooling medium runner, and the back bearing frame all is equipped with the cooling medium runner with the back bearing frame overcoat, and the back bearing can directly be through the back bearing frame cooling, can reach the cooling effect the same with the front bearing to the life of extension back bearing.
Because back bearing frame and back bearing frame overcoat are cooled off through the coolant flow channel of intercommunication simultaneously, and can not lead to both differences in temperature big, avoid appearing not refrigerated back bearing frame thermal expansion, receive the refrigerated back bearing frame overcoat to shrink to avoid the cooperation effect to be destroyed, guarantee the pretension of bearing.
Because the rear bearing seat is provided with the cooling medium flow passage, the bearing can be arranged in the inner hole of the machine body assembly, so that the bearing span of the main shaft is shortened, and the length limit requirement of the turning and milling electric main shaft on a machine tool can be met.
Because the rear bearing seat is provided with the cooling medium flow passage, the rear bearing can be a smaller type bearing meeting the load, the cost is reduced, the rotational inertia of the main shaft is reduced, and the acceleration and deceleration time of the main shaft is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.
In the invention, the meaning of "a plurality of" is one or more, the meaning of "a plurality of" is more than two, and the meaning of "more than", "less than", "more than" and the like is understood to not include the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there are descriptions of "first" and "second" for the purpose of distinguishing technical features only, they are not interpreted as indicating or implying relative importance or implicitly indicating the number of the technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
Wherein, fig. 1 shows a reference direction of the embodiment of the present invention, and the following describes the embodiment of the present invention with reference to the direction shown in fig. 1.
Referring to fig. 1, an embodiment of the present invention provides an electric spindle, which includes a machine body assembly 1 and a shaft core assembly 2, wherein the machine body assembly 1 is provided with a front bearing seat assembly 5 and a rear bearing seat assembly 3, a front end of the shaft core assembly 2 is supported on the front bearing seat assembly 5 through a front bearing 6, and a rear end is supported on the rear bearing seat assembly 3 through a rear bearing 4. The shaft core component 2 comprises a shaft core and a rotor, the machine body component 1 comprises a machine body and a stator, one or more front bearings 6 and one or more rear bearings 4 are arranged according to needs, the shaft core component 2 can be driven to rotate through the rotor and the stator in the machine body component 1, and torque is output at the front end of the machine body component 1.
Referring to fig. 1 and 2, the rear bearing seat assembly 3 includes a rear bearing seat outer sleeve 31 and a rear bearing seat 32, the rear bearing seat outer sleeve 31 is connected with the machine body assembly 1, an outer ring of the rear bearing 4 is supported on the rear bearing seat 32, an inner ring of the rear bearing 4 is matched with the shaft core assembly 2, the rear bearing seat 32 is matched with the rear bearing seat outer sleeve 31, and the rear bearing seat 32 can float axially relative to the rear bearing seat outer sleeve 31 to form a floating end bearing structure. The rear bearing housing outer sleeve 31 is provided with a first cooling medium flow passage 33, and cooling media such as cooling water can be introduced into the first cooling medium flow passage 33 to cool the rear bearing housing outer sleeve 31. The rear bearing housing 32 is provided with a second cooling medium flow passage 34, and a cooling medium such as cooling water can be introduced into the second cooling medium flow passage 34 to cool the rear bearing housing 32. The first cooling medium flow passage 33 is communicated with the second cooling medium flow passage 34, cooling media such as cooling water flow through the first cooling medium flow passage 33 and the second cooling medium flow passage 34, so that it is guaranteed that the cooling media for cooling the outer sleeve of the rear bearing seat can also be cooled to the rear bearing seat 32, the first cooling medium flow passage 33 and the second cooling medium flow passage 34 jointly realize cooling of the rear bearing seat assembly 3, and heat generated in the working process of the rear bearing is more fully taken away. The front bearing block assembly 5 is provided with a third cooling medium flow passage 51, and a cooling medium such as cooling water can be introduced into the third cooling medium flow passage 51 to cool the front bearing 6. The invention solves the problems caused by insufficient and uneven cooling of the bearing, prolongs the service life of the front bearing and the rear bearing and avoids influencing the pre-tightening of the bearing.
Since the rear bearing housing 32 is capable of floating in the axial direction with respect to the rear bearing housing cover 31, the first cooling medium flow passage 33 and the second cooling medium flow passage 34 may be connected by a flexible tube, a floating joint, or the like, in order to communicate the first cooling medium flow passage 33 and the second cooling medium flow passage 34.
For example, in the embodiment shown in fig. 1 and 2, the rear bearing housing assembly 3 further includes a connecting pipe 35, the connecting pipe 35 is axially disposed and assembled between the rear bearing housing jacket 31 and the rear bearing housing 32, the connecting pipe 35 connects the first cooling medium flow passage 33 and the second cooling medium flow passage 34, and the connecting pipe 35 is movably fitted with the rear bearing housing jacket 31 and/or the rear bearing housing 32 to realize a floating connection. In other words, the connecting pipe 35 can be movably matched with the rear bearing seat 32 after being fixedly connected with the rear bearing seat outer sleeve 31; the connecting pipe 35 can also be fixedly connected with the rear bearing seat 32 and then movably matched with the rear bearing seat outer sleeve 31; the connecting pipe 35 can also be movably matched with the rear bearing seat 32 and the rear bearing seat jacket 31 at two ends respectively. The connecting pipe 35 ensures that the first cooling medium flow passage 33 and the second cooling medium flow passage 34 are communicated without being influenced by the floating of the bearing through a formed floating connecting structure, so that the cooling medium for cooling the outer sleeve of the rear bearing seat can be cooled to the rear bearing seat 32.
Further, in some embodiments, referring to fig. 1 and 2, the rear bearing seat jacket 31 is provided with a first axial insertion hole communicated with the first cooling medium flow passage 33, the rear bearing seat 32 is provided with a second axial insertion hole communicated with the second cooling medium flow passage 34, one end of the connecting pipe 35 is assembled in the first axial insertion hole and is in interference fit with the first axial insertion hole, the other end of the connecting pipe 35 is assembled in the second axial insertion hole and is in clearance fit with the second axial insertion hole, and the large clearance fit between the connecting pipe 35 and the rear bearing seat 32 ensures that the floating of the bearing is not affected, thus ensuring that water cooling the rear bearing seat jacket can also be cooled to the rear bearing seat 32.
Here, it is understood that the number of the connection pipes 35 is determined to be specifically set, for example, two or more, according to the water inlet and outlet needs.
In order to avoid leakage of the cooling medium at the connection pipe 35, a seal ring 36 is provided between the connection pipe 35 and each of the first and second axial insertion holes. The sealing ring 36 between the connecting pipe 35 and the second axial insertion hole can ensure the sealing performance and ensure that the connecting pipe 35 can float relatively to the rear bearing seat 32 without being affected.
Referring to fig. 1 and 2, the rear bearing housing 32 includes a first member 37 and a second member 38, and each of the first member 37 and the second member 38 has a ring shape. The first member 37 extends in the axial direction to form a cylindrical shape, the first member 37 is located on the inner side of the rear bearing seat outer sleeve 31 in the radial direction, the rear bearing 4 is assembled on the first member 37, the second cooling medium flow passage 34 is arranged on the first member 37, and the cooling medium in the second cooling medium flow passage 34 directly cools the first member 37, so that the cooling effect on the rear bearing 4 is greatly improved. The second part 38 extends along the radial direction to form a circular flange shape, the second part 38 is positioned at the rear of the rear bearing seat outer sleeve 31 along the axial direction, the second part 38 of the rear bearing seat 32 and the rear bearing seat outer sleeve 31 are distributed along the axial direction, the connecting pipe 35 is arranged between the second part 38 and the rear bearing seat outer sleeve 31, the rear bearing seat 32 realizes the communication between the first cooling medium flow passage 33 and the second cooling medium flow passage 34 through a pore passage arranged in the second part 38, and the bearing cooling is not influenced by the floating of the bearing.
In some embodiments, referring to fig. 1 and 2, a rolling sleeve 39 is arranged between the rear bearing seat outer sleeve 31 and the first component 37, the rolling sleeve 39 ensures the reliable floating performance of the main shaft, but the cooling and pre-tightening of the bearing are higher in requirements due to the difference of the heat conductivity coefficient of the rolling sleeve 39, and the invention realizes the sufficient cooling of the bearing by bypassing the rolling sleeve 39 through the first cooling medium flow passage 33 and the second cooling medium flow passage 34 which are communicated, thereby greatly improving the cooling and pre-tightening effects of the bearing.
In some embodiments, referring to fig. 1 and 2, a pre-tightening spring 310 is disposed between the rear bearing housing 31 and the second member 38, and the pre-tightening spring 310 applies an axial pre-tightening force to the rear bearing housing 32 for pre-tightening the rear bearing 4. To facilitate the installation of the pre-tightening spring 310, an installation groove may be provided on the rear bearing housing shell 31 or the second member 38 for accommodating the pre-tightening spring 310.
In order to ensure the cooling effect, the first cooling medium flow passage 33 surrounds the rear bearing seat outer sleeve 31 for one or more circles, the first cooling medium flow passage 33 may be formed by a hole or a slot, and the first cooling medium flow passage 33 may be arranged in a winding S shape or a simple ring shape, for example, in some embodiments shown in fig. 1 and 2, a first ring groove is formed on the outer wall of the rear bearing seat outer sleeve 31, the rear bearing seat outer sleeve 31 is embedded into the engine block assembly 1, the engine block assembly 1 is matched with the rear bearing seat outer sleeve 31, and the engine block assembly 1 shields the first ring groove to form the first cooling medium flow passage 33. The block assembly 1 is perforated in the corresponding position, and the cooling medium is introduced into or taken out of the first cooling medium flow passage 33. The structural form of forming the first cooling medium flow passage 33 by the first annular groove greatly reduces the processing difficulty of the first cooling medium flow passage 33 on the rear bearing seat outer sleeve 31.
The second cooling medium flow channel 34 surrounds the rear bearing seat 32 for one or more circles, the second cooling medium flow channel 34 may be formed by drilling or slotting, the second cooling medium flow channel 34 may be provided with a winding S-shape or a simple ring shape, for example, in some embodiments shown in fig. 1 and 2, the rear end of the first member 37 is provided with a second annular groove 311, the second member 38 is engaged with the first member 37 and shields the second annular groove 311, the front end of the first member 37 is provided with a third annular groove 312, the rear bearing seat 32 further includes a third member 313, the third member 313 is engaged with the first member 37 and shields the third annular groove 312, and in addition, the third member 313 also provides an axial limit for the outer ring of the rear bearing. The second ring groove 311 and the third ring groove 312 communicate with each other through the axial hole 314, and the second ring groove 311 and the third ring groove 312 form two second cooling medium flow passages 34. The second member 38 is bored to communicate the first cooling medium flow passage 33 and the second cooling medium flow passage 34. The first part 37, the second part 38 and the third part 313 are connected into a whole after being provided with corresponding holes or grooves, so that the manufacturing difficulty of two cooling medium flow channels on the rear bearing seat 32 is greatly reduced, and the cooling effect of the rear bearing 4 is ensured.
Specifically, referring to fig. 1, the cooling liquid is input from the body assembly 1 and then flows to the rear bearing seat jacket, and at this time, the cooling liquid is divided into two cooling water passages, one cooling water passage is a first cooling medium passage 33, the first cooling medium passage 33 flows to the opposite side around the rear bearing seat jacket 31, the other cooling water passage flows into the rear bearing seat 32 through a connecting pipe 35, flows to the opposite side after cooling the rear bearing seat 32 through a second cooling medium passage 34, is then led out through the connecting pipe 35, and flows out after meeting with the first cooling medium passage 33, and the two passages respectively cool the rear bearing seat jacket and the rear bearing seat 32.
In some embodiments, referring to fig. 1, the machine body assembly 1 is provided with a fourth cooling medium flow passage 11, the fourth cooling medium flow passage 11 is located outside the stator, and cooling media such as cooling water can be introduced into the fourth cooling medium flow passage 11 to cool the stator and dissipate heat generated by the high-power motor in time.
The cooling medium flow passage of the front bearing housing assembly 5, the cooling medium flow passage of the rear bearing housing assembly 3, and the cooling medium flow passage of the block assembly 1 may be provided independently of each other or in communication with each other, as required.
For example, in some embodiments shown in fig. 1, the fourth cooling medium flow passage 11 communicates with the second cooling medium flow passage 34, and the third cooling medium flow passage 51 communicates with the first cooling medium flow passage 33. During operation, the cooling medium enters the motorized spindle and flows through the third cooling medium channel 51, the first cooling medium channel 33, the second cooling medium channel 34 and the fourth cooling medium channel 11 in sequence. The cooling medium can effectively cool the parts generating heat in the working process of the main shaft, and the most main heating part of the electric main shaft of the machining center is the stator, so that the temperature of the stator is increased greatly after the cooling medium is cooled, and the bearing is cooled sufficiently by preferentially cooling the bearing.
The fourth cooling medium channel 11 may be arranged in a winding S shape, a spiral shape, or a simple ring shape along the outer wall of the housing assembly. In some embodiments, referring to fig. 1, the electric spindle further includes a spindle box 7, the outer peripheral surface of the machine body component is provided with a spiral ring groove, the machine body component is assembled in the spindle box 7, the spindle box 7 is matched with the machine body component, the spindle box 7 covers the spiral ring groove to form a fourth cooling medium flow passage 11, the spindle box 7 is provided with a water inlet 71 communicated with the third cooling medium flow passage 51, and the spindle box 7 is provided with a water outlet 72 communicated with the fourth cooling medium flow passage 11.
Cooling only enters a first loop of the machine body component from a water inlet 71 of the spindle box 7, the first loop surrounds the outer wall of the front end of the machine body component, enters a radial hole after surrounding the machine body component for a circle, flows into a cooling water hole of the machine body component from the radial hole after surrounding a front bearing seat component for a circle through a ring third cooling medium flow passage 51, then flows to a rear bearing outer sleeve, at the moment, the cooling water is divided into two cooling water passages, one first cooling medium flow passage 33 surrounding the rear bearing seat outer sleeve flows to the outlet position of the first cooling medium flow passage 33 at the opposite side, the other cooling medium flow passage flows into the rear bearing seat through a connecting pipe, flows around the cooling water passage 34 from the opposite side position, flows to the outlet position of the first cooling medium flow passage 33 through a connecting pipe, the rear bearing outer sleeve and the rear bearing seat are cooled by the two passages respectively, and flows to the front end of the machine body component through the cooling water hole of the component, flows out of body components, surrounds body components to ninth, reaches ((r): around body components), ((r): around body components) to ((r): around body components), ((r): around body components to (r): around body components) and (r): around body components to (72) water outlet.
The embodiment of the invention also provides a machine tool which comprises the electric spindle in any one of the embodiments and is used for turning, boring, drilling, milling and the like.
The invention has the following advantages:
the rear bearing seat 32 and the rear bearing seat outer sleeve 31 are both provided with cooling medium channels, the rear bearing 4 can be directly cooled through the rear bearing seat 32, the cooling effect same as that of the front bearing can be achieved, and therefore the service life of the rear bearing 4 is prolonged.
Because the rear bearing seat 32 and the rear bearing seat outer sleeve 31 are simultaneously cooled through the communicated cooling medium flow channels, the temperature difference between the rear bearing seat 32 and the rear bearing seat outer sleeve 31 is not large, the phenomenon that the rear bearing seat 32 which is not cooled is heated to expand is avoided, the cooled rear bearing seat outer sleeve 31 is reduced, the matching effect is prevented from being damaged, and the pre-tightening of the bearing is ensured.
Because the rear bearing seat 32 is provided with the cooling medium flow passage, the bearing can be arranged in the inner hole of the machine body assembly 1, so that the bearing span of the main shaft is shortened, and the length limit requirement of the turning and milling electric main shaft on a machine tool can be met.
Because the rear bearing seat 32 is provided with a cooling medium flow passage, the rear bearing 4 can be a smaller bearing meeting the load, so that the cost is reduced, the rotational inertia of the main shaft is reduced, and the acceleration and deceleration time of the main shaft is shortened.
The cooling effect of the bearing is greatly improved by cooling the bearing by the cooling liquid and then cooling the motor.
In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (8)
1. An electric spindle, comprising:
the machine body assembly is provided with a front bearing seat assembly and a rear bearing seat assembly;
the front end of the shaft core assembly is supported on the front bearing seat assembly through a front bearing, and the rear end of the shaft core assembly is supported on the rear bearing seat assembly through a rear bearing;
the rear bearing seat assembly comprises a rear bearing seat outer sleeve and a rear bearing seat, the rear bearing seat outer sleeve is connected with the machine body assembly, an outer ring of the rear bearing is supported on the rear bearing seat, the rear bearing seat is matched with the rear bearing seat outer sleeve, the rear bearing seat can float relative to the rear bearing seat outer sleeve along the axial direction, a first cooling medium flow channel is arranged on the rear bearing seat outer sleeve, a second cooling medium flow channel is arranged on the rear bearing seat, and the first cooling medium flow channel is communicated with the second cooling medium flow channel; the front bearing seat assembly is provided with a third cooling medium flow passage;
still include the connecting pipe, the connecting pipe along the axial set up and assemble in between back bearing frame overcoat and the back bearing frame, the connecting pipe will first cooling medium runner and second cooling medium runner are linked together, the connecting pipe with back bearing frame overcoat and/or back bearing frame clearance fit are in order to realize floating the connection, the back bearing frame overcoat be equipped with the first axial jack of first cooling medium runner intercommunication, the back bearing frame be equipped with the second axial jack of second cooling medium runner intercommunication, the one end of connecting pipe assemble in first axial jack, and with first axial jack interference fit, the other end assembly of connecting pipe in second axial jack, and with second axial jack clearance fit.
2. The electric spindle of claim 1, wherein the rear bearing housing comprises a first member and a second member, the first member and the second member each having an annular shape, the first member being located radially inside the rear bearing housing jacket, the second member being located axially behind the rear bearing housing jacket, the connecting tube being disposed between the second member and the rear bearing housing jacket, the second cooling medium flow passage being disposed in the first member.
3. The electric spindle of claim 2, wherein a rolling sleeve is provided between the rear bearing housing jacket and the first member.
4. The electric spindle according to claim 2, wherein a second ring groove is formed at a rear end of the first member, the second member is engaged with the first member and covers the second ring groove, a third ring groove is formed at a front end of the first member, the rear bearing housing further includes a third member, the third member is engaged with the first member and covers the third ring groove, the second ring groove and the third ring groove are communicated with each other through an axial hole, and the second ring groove and the third ring groove form the second cooling medium flow passage.
5. The electric spindle of claim 1, wherein a first annular groove is formed in an outer wall of the rear bearing housing, the body member is engaged with the rear bearing housing, and the body member covers the first annular groove to form the first cooling medium flow passage.
6. The motorized spindle of claim 1, wherein the housing assembly defines a fourth cooling medium flow passage, the fourth cooling medium flow passage is in communication with the second cooling medium flow passage, the third cooling medium flow passage is in communication with the first cooling medium flow passage, and the cooling medium flows through the third cooling medium flow passage, the first cooling medium flow passage, the second cooling medium flow passage, and the fourth cooling medium flow passage in this order.
7. The electric spindle according to claim 6, further comprising a spindle box, wherein a spiral ring groove is formed on an outer peripheral surface of the machine body component, the machine body component is assembled in the spindle box, the spindle box covers the spiral ring groove to form the fourth cooling medium flow passage, the spindle box is provided with a water inlet communicated with the third cooling medium flow passage, and the spindle box is provided with a water outlet communicated with the fourth cooling medium flow passage.
8. A machine tool comprising an electric spindle according to any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110063601.7A CN112792363B (en) | 2021-01-18 | 2021-01-18 | Electric spindle and machine tool |
| PCT/CN2021/092213 WO2022151617A1 (en) | 2021-01-18 | 2021-05-07 | Motor spindle and machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110063601.7A CN112792363B (en) | 2021-01-18 | 2021-01-18 | Electric spindle and machine tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112792363A CN112792363A (en) | 2021-05-14 |
| CN112792363B true CN112792363B (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110063601.7A Active CN112792363B (en) | 2021-01-18 | 2021-01-18 | Electric spindle and machine tool |
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| Country | Link |
|---|---|
| CN (1) | CN112792363B (en) |
| WO (1) | WO2022151617A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2521566B2 (en) * | 1990-06-27 | 1996-08-07 | オークマ株式会社 | High speed spindle head with fan for spindle cooling |
| KR101503010B1 (en) * | 2013-09-11 | 2015-03-16 | 주식회사 에스엠에스비 | high speed/high frequency spindle |
| CN110560713B (en) * | 2019-09-05 | 2024-06-04 | 深圳市爱贝科精密工业股份有限公司 | Floating type motorized spindle |
| CN210475550U (en) * | 2019-09-17 | 2020-05-08 | 深圳市爱贝科精密机械有限公司 | Large-load high-rigidity permanent magnet synchronous electric spindle |
| CN111687681B (en) * | 2020-07-10 | 2024-06-04 | 深圳市爱贝科精密工业股份有限公司 | Cooling mechanism of electric spindle and electric spindle |
| CN112059214A (en) * | 2020-10-03 | 2020-12-11 | 深圳市爱贝科精密机械有限公司 | High-efficient oil-gas lubrication main shaft |
-
2021
- 2021-01-18 CN CN202110063601.7A patent/CN112792363B/en active Active
- 2021-05-07 WO PCT/CN2021/092213 patent/WO2022151617A1/en active Application Filing
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| CN112792363A (en) | 2021-05-14 |
| WO2022151617A1 (en) | 2022-07-21 |
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