CN109590488B - Bushings, electric spindles and machine tools - Google Patents
Bushings, electric spindles and machine tools Download PDFInfo
- Publication number
- CN109590488B CN109590488B CN201811485301.2A CN201811485301A CN109590488B CN 109590488 B CN109590488 B CN 109590488B CN 201811485301 A CN201811485301 A CN 201811485301A CN 109590488 B CN109590488 B CN 109590488B
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- bearing
- installation position
- sealing ring
- shaft sleeve
- cooling groove
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- 238000001816 cooling Methods 0.000 claims abstract description 91
- 230000002093 peripheral effect Effects 0.000 claims abstract description 37
- 238000005192 partition Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 89
- 238000009434 installation Methods 0.000 claims description 67
- 238000004891 communication Methods 0.000 claims description 33
- 239000000110 cooling liquid Substances 0.000 claims description 27
- 230000005611 electricity Effects 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000012809 cooling fluid Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
- B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or spindles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turning (AREA)
- Mounting Of Bearings Or Others (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
本发明提供一种轴套、电主轴和机床，沿轴套的轴向方向上，轴套内依次设置有前轴承室、电机室和后轴承室，其中，轴套在位于后轴承室的内周壁上设置有圆弧形的冷却槽，冷却槽的起始端与终止端之间具有间隔壁；轴套的外周壁上设置有与冷却槽连通的入口和出口，入口与冷却槽的起始端连通，出口与冷却槽的终止端连通。本发明的电主轴通过设置在轴套上的冷却槽对后轴承组件进行冷却，冷却效果好，有效的控制了后轴承的温升，提高电主轴的加工精度。
The present invention provides a shaft sleeve, an electric spindle and a machine tool. Along the axial direction of the shaft sleeve, a front bearing chamber, a motor chamber and a rear bearing chamber are sequentially arranged in the shaft sleeve, wherein the shaft sleeve is provided with an arc-shaped cooling groove on the inner peripheral wall located in the rear bearing chamber, and a partition wall is provided between the starting end and the ending end of the cooling groove; an inlet and an outlet connected to the cooling groove are provided on the outer peripheral wall of the shaft sleeve, the inlet is connected to the starting end of the cooling groove, and the outlet is connected to the ending end of the cooling groove. The electric spindle of the present invention cools the rear bearing assembly through the cooling groove arranged on the shaft sleeve, has a good cooling effect, effectively controls the temperature rise of the rear bearing, and improves the machining accuracy of the electric spindle.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a shaft sleeve, an electric spindle and a machine tool.
Background
The electric spindle is a new technology for integrating the spindle of the machine tool with a spindle motor in the field of numerical control machine tools, and pushes high-speed machining to a new era along with a linear motor technology and a high-speed cutter technology. The electric spindle comprises the electric spindle and accessories thereof, and comprises the electric spindle, a high-frequency conversion device, an oil mist lubricator, a cooling device, a built-in encoder, a tool changing device and the like. The rotor of the motor is directly used as a main shaft of the machine tool, the shell of the main shaft unit is the motor base, and the motor and the main shaft of the machine tool are integrated by matching with other parts.
At present, with the rapid development and the gradual perfection of electric transmission technologies (variable frequency speed regulation technology, motor vector control technology and the like), the mechanical structure of a main transmission system of a high-speed numerical control machine tool is greatly simplified, and belt wheel transmission and gear transmission are basically canceled. The main shaft of the machine tool is directly driven by an internal motor, so that the length of a main transmission chain of the machine tool is shortened to zero, and zero transmission of the machine tool is realized. The transmission structure of the spindle motor and the machine tool spindle is that the spindle component is relatively independent from the transmission system and the whole structure of the machine tool, so the spindle motor can be made into a spindle unit commonly called an electric spindle.
The electric spindle consists of a shell-free motor, a spindle, a bearing, a spindle unit shell, a driving module, a cooling device and the like. The rotor of the motor is integrated with the main shaft by a press fit method, and the main shaft is supported by front and rear bearings. The stator of the motor is mounted in the housing of the spindle unit via a sleeve.
Because the electric spindle integrates the motor into the spindle unit, and the rotating speed is very high, a large amount of heat can be generated during operation, so that the temperature rise of the electric spindle is caused, the thermal state characteristic and the dynamic characteristic of the electric spindle are deteriorated, and the normal operation of the electric spindle is affected. Therefore, measures must be taken to control the temperature of the motorized spindle so that it is constant within a certain value. The machine tool generally adopts a circulating coolant cooling mode to cool the stator of the electric spindle, and takes away heat generated by high-speed rotation of the spindle.
The bearing structure layout of the existing machine tool spindle generally adopts a structure of front three and rear two, namely three front bearings and two rear bearings, and the front bearings and the rear bearings are angular contact ball bearings. But the rigidity of the bearing is reduced and the rigidity of the main shaft is reduced, thereby affecting the machining precision. In addition, due to the structure of the bearing, the cooling unit cannot cool the rear bearing, and the rear bearing has a certain temperature rise after long-term use, so that the normal operation of the electric spindle is affected.
Disclosure of Invention
A first object of the present invention is to provide a bushing with good cooling properties.
A second object of the present invention is to provide an electric spindle with a bushing as described above.
A third object of the invention is to provide a machine tool with an electric spindle as described above.
In order to achieve the first object, the present invention provides a shaft sleeve of an electric spindle, in which a front bearing chamber, a motor chamber and a rear bearing chamber are sequentially disposed in the shaft sleeve along an axial direction of the shaft sleeve, wherein the shaft sleeve is provided with a circular arc-shaped cooling groove on an inner peripheral wall of the rear bearing chamber, and a partition wall is disposed between a start end and a stop end of the cooling groove; an inlet and an outlet which are communicated with the cooling groove are arranged on the peripheral wall of the shaft sleeve, the inlet is communicated with the initial end of the cooling groove, and the outlet is communicated with the final end of the cooling groove.
Further, the central angle of the cooling groove is larger than 180 degrees. Preferably, the central angle of the cooling groove is 330 °.
Further, the cooling groove is coaxially arranged with the shaft sleeve.
Further, a spiral runner is arranged on the outer peripheral wall of the shaft sleeve, and the runner extends from the outer peripheral wall of the front bearing chamber to the outer peripheral wall of the junction of the motor chamber and the rear bearing chamber.
Still further scheme is, still be provided with first sealing washer installation position, second sealing washer installation position and third sealing washer installation position on the peripheral wall of axle sleeve, along the axial of axle sleeve, first sealing washer installation position and second sealing washer installation position are located the both ends of runner respectively, and third sealing washer installation position is located the one side of keeping away from first sealing washer installation position outside the second sealing washer installation position, and the entry setting is in the runner that is close to second sealing washer installation position, and the export setting is between second sealing washer installation position and third sealing washer installation position.
Further, along the axial of axle sleeve, the cooling tank is located the one side that the second sealing washer was kept away from outward to the third sealing washer installation position, is provided with first communication hole and the second intercommunicating pore along the axial extension of axle sleeve on the axle sleeve, and first communication hole communicates the initial end of entry and cooling tank, and the second intercommunicating pore communicates the export with the termination end of cooling tank.
According to the scheme, the cooling liquid flows through the flow channel, so that the front bearing chamber and the motor chamber are cooled, the spiral flow channel enlarges the path through which the cooling liquid flows, and the cooling efficiency is greatly improved; through setting up the cooling tank in the position of back bearing room, the coolant liquid gets into the cooling tank from the start end of cooling tank in, flows out from the end after the cooling tank to cool off back bearing room, owing to be provided with the partition wall between the start end of cooling tank and the end, consequently the start end and the end of cooling tank do not form closed circuit, prevent the coolant liquid backward flow, improved the cooling efficiency of coolant liquid in the cooling tank, can cool off back bearing room effectively.
In order to achieve the second object, the present invention provides an electric spindle, including a housing, a shaft sleeve, a stator, a rotor, a shaft core, a front bearing assembly and a rear bearing assembly, wherein, in the axial direction of the shaft sleeve, a front bearing chamber, a motor chamber and a rear bearing chamber are sequentially arranged in the shaft sleeve, the front bearing assembly is arranged in the front bearing chamber, the stator is sleeved on the rotor, the stator and the rotor are arranged in the motor chamber, the rear bearing assembly is arranged in the rear bearing chamber, the shaft core passes through the axial direction of the stator and is fixedly connected with the stator, the shaft sleeve is provided with a circular arc cooling groove on the inner peripheral wall of the rear bearing chamber, and a partition wall is arranged between the starting end and the terminating end of the cooling groove; an inlet and an outlet which are communicated with the cooling groove are arranged on the peripheral wall of the shaft sleeve, the inlet is communicated with the initial end of the cooling groove, and the outlet is communicated with the final end of the cooling groove.
Further, the central angle of the cooling groove is larger than 180 degrees. Preferably, the central angle of the cooling groove is 330 degrees and 330 degrees.
Further, the cooling groove is coaxially arranged with the shaft sleeve.
Further, a spiral runner is arranged on the outer peripheral wall of the shaft sleeve, and the runner extends from the outer peripheral wall of the front bearing chamber to the outer peripheral wall of the junction of the motor chamber and the rear bearing chamber.
The outer peripheral wall of the shaft sleeve is also provided with a first sealing ring installation position, a second sealing ring installation position and a third sealing ring installation position, the first sealing ring installation position and the second sealing ring installation position are respectively positioned at two ends of the flow channel along the axial direction of the shaft sleeve, the third sealing ring installation position is positioned at one side, far away from the first sealing ring installation position, of the second sealing ring installation position, the inlet is arranged in the flow channel close to the second sealing ring installation position, and the outlet is arranged between the second sealing ring installation position and the third sealing ring installation position; a first sealing ring is arranged in the first sealing ring installation position, a second sealing ring is arranged in the second sealing ring installation position, and a third sealing ring is arranged in the third sealing ring installation position; the shell is provided with a cooling liquid inlet and a cooling liquid outlet, the cooling liquid inlet is communicated with one end of the runner, which is close to the first sealing ring, and the cooling liquid outlet is positioned between the second sealing ring and the third sealing ring.
Further, along the axial of axle sleeve, the cooling tank is located the outside one side of keeping away from of third sealing washer installation position the second sealing washer, is provided with first communication hole and the second intercommunicating pore of axial extension along the axle sleeve on the axle sleeve, and first communication hole communicates the initial end of entry and cooling tank, and the second intercommunicating pore communicates the export with the termination end of cooling tank.
Further, the front bearing assembly comprises a first roller bearing and an angular contact ball bearing, the first roller bearing and the angular contact ball bearing are coaxially arranged, and the first roller bearing and the angular contact ball bearing are mounted at the front end of the shaft sleeve.
Further, the front bearing assembly comprises a first roller bearing and two angular contact ball bearings, and the first roller bearing is a double-row first roller bearing.
The rear bearing assembly comprises a second roller bearing and a bearing seat, wherein the bearing seat is sleeved on the second roller bearing, and the bearing seat is arranged at the rear end of the shaft sleeve.
The further scheme is that a first annular mounting groove and a second annular mounting groove are formed in the outer peripheral wall of the bearing seat, the cooling groove is located between the first annular mounting groove and the second annular mounting groove, a fourth sealing ring is installed in the first annular mounting groove, and a fifth sealing ring is installed in the second annular mounting groove.
The further scheme is that the side wall of the bearing seat is provided with a wire passing hole along the axial direction of the bearing seat.
According to the scheme, the first roller bearing is arranged in the front bearing chamber, and the second roller bearing is arranged in the rear bearing chamber, so that the rigidity of the electric spindle is greatly improved. And as the cooling effect of the shaft sleeve is good, the temperature rise of the front bearing assembly, the stator and the rear bearing assembly is effectively controlled, and the machining precision of the electric spindle is improved.
In order to achieve the third object, the invention provides a machine tool, which comprises the electric spindle.
Drawings
Fig. 1 is a radial cross-sectional view of an embodiment of an electrospindle of the present invention.
Fig. 2 is an end view of a sleeve of an embodiment of an motorized spindle of the present invention.
Fig. 3 is a cross-sectional view taken along the direction A-A in fig. 2.
Fig. 4 is a sectional view in the direction B-B of fig. 3.
Fig. 5 is an enlarged view of the structure of the portion D in fig. 1.
Fig. 6 is an enlarged view of the structure of the portion E in fig. 1.
Fig. 7 is an end view of a rear bearing assembly of an motorized spindle embodiment of the present invention.
Fig. 8 is a sectional view in the direction C-C of fig. 7.
Fig. 9 is an enlarged view of the structure of the F portion in fig. 1.
The invention is further described below with reference to the drawings and examples.
Detailed Description
Referring to fig. 1, fig. 1 is a radial cross-sectional view of an electrospindle embodiment of the present invention. In this embodiment, the electric spindle comprises a housing, a shaft sleeve 1, a stator 2, a rotor 3, a shaft core 4, a front bearing assembly and a rear bearing assembly, and the structure of the housing is hidden in fig. 1. The stator 2 is sleeved on the rotor 3, the shaft core 4 passes through the stator 2 from the axial direction and is fixedly connected with the stator 2, the front bearing component is arranged at the front end of the shaft core 4, the rear bearing component is arranged at the rear end of the shaft core 4, the shaft sleeve 1 is sleeved on the front bearing component, the stator 2 and the rear bearing component, and the shell is sleeved on the shaft sleeve 1.
The front bearing assembly comprises a first roller bearing 5 and an angular contact ball bearing 6, the first roller bearing 5 and the angular contact ball bearing 6 are coaxially arranged, and the first roller bearing 5 and the angular contact ball bearing 6 are mounted at the front end of the shaft sleeve 1. In this embodiment, the front bearing assembly comprises one first roller bearing 5 and two angular contact ball bearings 6, the first roller bearing 5 being a double row first roller bearing.
The rear bearing assembly comprises a second roller bearing 7 and a bearing seat 8, wherein the bearing seat 8 is sleeved on the second roller bearing 7, and the bearing seat 8 is arranged at the rear end of the shaft sleeve 1.
The bearing structure of this embodiment is arranged in a structure of "front three and rear one", that is, two angular contact ball bearings at the front end are in a group with one first roller bearing and one second roller bearing at the rear end, and compared with the existing bearing structure of "front three and rear two", the rigidity of the bearing structure of this embodiment is 40% to 50% higher, and the processing precision is higher. However, since the heat generation amount of the roller bearing is much larger than that of the angular ball bearing, the rear bearing assembly must be subjected to a cooling process.
Referring to fig. 2, 3 and 4, fig. 2 is an end view of a sleeve of an electric spindle embodiment of the present invention, fig. 3 is a sectional view in A-A direction of fig. 2, and fig. 4 is a sectional view in B-B direction of fig. 3. Referring to fig. 1, a front bearing chamber 10, a motor chamber 11 and a rear bearing chamber 12 are sequentially arranged in the shaft sleeve 1 along the axial direction of the shaft sleeve 1, a front bearing assembly is arranged in the front bearing chamber 10, a stator 2 and a rotor 3 are arranged in the motor chamber 11, and a rear bearing assembly is arranged in the rear bearing chamber 12.
The sleeve 1 is provided with a circular arc-shaped cooling groove 120 on the inner peripheral wall of the rear bearing chamber 12, and the cooling groove 120 is provided coaxially with the sleeve 1. The central angle of the cooling groove 120 is greater than 180 °. Preferably, the central angle of the cooling groove 120 is 330 °. The cooling tank 120 is not connected at both ends, the cooling tank 120 has a start end 1201 and a stop end 1202, and a partition wall 1203 is provided between the start end 1201 and the stop end 1202 of the cooling tank 120.
The end face of the sleeve 1 is provided with a first communication hole 13 and a second communication hole 14 extending in the axial direction of the sleeve 1, the first communication hole 13 and the second communication hole 14 are blind holes, the first communication hole 13 communicates with the start end 1201 of the cooling groove 120, and the second communication hole 14 communicates with the end 1202 of the cooling groove 120. The axial end of the first communication hole 13 is provided with a first sealing plug 130, the first sealing plug 130 sealing the end of the first communication hole 13; the axial end of the second communication hole 14 is provided with a second sealing plug 140, and the second sealing plug 140 seals the end of the second communication hole 14.
The outer peripheral wall 15 of the sleeve 1 is provided with a spiral flow passage 150, and the flow passage 150 extends from the outer peripheral wall of the front bearing chamber 10 to the outer peripheral wall at the junction of the motor chamber 11 and the rear bearing chamber 12. The outer peripheral wall 15 of the shaft sleeve 1 is further provided with a first sealing ring installation position 151, a second sealing ring installation position 152 and a third sealing ring installation position 153, the first sealing ring installation position 151 and the second sealing ring installation position 152 are respectively located at two ends of the flow channel 150 along the axial direction of the shaft sleeve 1, and the third sealing ring installation position 153 is located at one side, far away from the first sealing ring installation position 151, of the second sealing ring installation position 152. An inlet 154 is provided in the flow passage 150 near the second seal ring mounting position 152, and the inlet 154 penetrates from the outer peripheral wall 15 of the sleeve 1 to the first communication hole 13, and the first communication hole 13 communicates the inlet 154 with the start end 1201 of the cooling groove 120. An outlet 155 is provided between the second seal ring mounting position 152 and the third seal ring mounting position 153, and the outlet 155 penetrates from the outer peripheral wall 15 of the sleeve 1 to the second communication hole 14, and the second communication hole 14 communicates the outlet 155 with the end 1202 of the cooling groove 120.
The first seal ring mounting locations 151 are provided with first seal rings 1510, and referring to fig. 5, in this embodiment, two first seal ring mounting locations 151 are provided on the outer peripheral wall 15 of the sleeve 1, and each first seal ring mounting location 151 is provided with a first seal ring 1510. The second seal ring installation position 152 is internally provided with a second seal ring 1520, the third seal ring installation position 153 is internally provided with a third seal ring 1530, and referring to fig. 6, in this embodiment, one second seal ring installation position 152 and two third seal ring installation positions 153 are arranged on the outer peripheral wall 15 of the shaft sleeve 1, and each third seal ring installation position 153 is internally provided with a third seal ring 1530.
Referring to fig. 3, the housing is provided with a coolant inlet and a coolant outlet (not shown), the coolant inlet communicates with one end of the flow passage 150 near the first seal ring 151, and a coolant (such as cooling water, cooling oil, etc.) enters the flow passage 150 from the coolant inlet in the direction of arrow 100, flows from the outer circumferential wall of the front bearing chamber 10 to the outer circumferential wall of the motor chamber 11 along a spiral passage in the flow passage 150, and flows into the first communication hole 13 at the inlet 154; then flows through the first communication hole 13, the cooling groove 120, and the second communication hole 14 in this order, and then flows out of the outlet 155; finally, the cooling fluid flows out of the cooling fluid outlet along arrow 101. The coolant outlet is located between the second seal 152 and the third seal 153, and communicates with the outlet 155. Therefore, after the cooling liquid enters the electric main shaft from the cooling liquid inlet, the front bearing assembly, the stator and the rear bearing assembly are cooled respectively, and finally the cooling liquid flows out from the cooling liquid outlet, so that the heating components in the electric main shaft are cooled effectively. Because the flow channel 150 is spiral, the flowing path of the cooling liquid in the flow channel 150 is effectively enlarged, the cooling efficiency of the cooling liquid is greatly improved, and the front bearing assembly and the stator can be effectively cooled. The cooling fluid flows in from the start end 1201 and out from the end 1202 within the cooling gallery 120, effectively cooling the rear bearing assembly. The temperature value of the electric spindle is controlled by controlling the flow of the cooling liquid, so that the electric spindle of the machine tool can realize high-rigidity processing under the condition of telling operation.
Referring to fig. 7 and 8, fig. 7 is an end view of the rear bearing assembly of the motorized spindle embodiment of the present invention, and fig. 8 is a cross-sectional view taken along the direction C-C of fig. 7. The rear bearing assembly comprises a second roller bearing 7 and a bearing seat 8 which are coaxially arranged, a wire passing hole 80 is arranged on the side wall of the bearing seat 8 along the axial direction of the bearing seat 8, and a wire passes through the wire passing hole 80 and is connected with the stator 2. The outer peripheral wall of the bearing seat 8 is provided with a first annular mounting groove 81 and a second annular mounting groove 82, a fourth annular sealing ring 810 is mounted in the first annular mounting groove 81, and a fifth annular sealing ring 820 is mounted in the second annular mounting groove 82. In the axial direction, the cooling groove 120 is located between the first annular mounting groove 81 and the second annular mounting groove 82 (see fig. 9). The fourth and fifth ring seals 810 and 820 seal the cooling groove 120 to prevent the cooling fluid from flowing out to cause a short circuit of the wires.
The invention also provides a machine tool, which comprises the motorized spindle of the embodiment.
Finally, it should be emphasized that the above description is only a preferred embodiment of the invention, and is not intended to limit the invention, as many variations and modifications are possible to those skilled in the art, for example, a simple variation in the number of angular contact ball bearings in the front bearing assembly; or any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. The utility model provides an electricity main shaft, includes the axle sleeve, follows on the axial of axle sleeve, set gradually preceding bearing room, motor room and back bearing room in the axle sleeve, its characterized in that:
the shaft sleeve is provided with a circular arc-shaped cooling groove on the inner peripheral wall of the rear bearing chamber, two ends of the cooling groove are not communicated, and a partition wall is arranged between the starting end and the ending end of the cooling groove;
An inlet and an outlet which are communicated with the cooling groove are formed in the peripheral wall of the shaft sleeve, the inlet is communicated with the starting end of the cooling groove, and the outlet is communicated with the ending end of the cooling groove;
The shaft sleeve is provided with a first communication hole and a second communication hole which extend along the axial direction of the shaft sleeve, the first communication hole communicates the inlet with the initial end of the cooling groove, and the second communication hole communicates the outlet with the final end of the cooling groove;
A spiral runner is arranged on the peripheral wall of the shaft sleeve, and extends from the peripheral wall of the front bearing chamber to the peripheral wall of the junction of the motor chamber and the rear bearing chamber;
The cooling liquid inlet, the runner, the inlet, the first communication hole, the cooling groove, the second communication hole, the outlet and the cooling liquid outlet of the electric spindle are sequentially communicated, and after entering the electric spindle from the cooling liquid inlet, the cooling liquid sequentially cools the front bearing assembly, the stator and the rear bearing assembly and finally flows out from the cooling liquid outlet;
The front bearing assembly comprises a first roller bearing and an angular contact ball bearing, the first roller bearing and the angular contact ball bearing are coaxially arranged, and the first roller bearing and the angular contact ball bearing are mounted at the front end of the shaft sleeve;
the front bearing assembly comprises one first roller bearing and two angular contact ball bearings, and the first roller bearing is a double-row first roller bearing;
The rear bearing assembly comprises a second roller bearing and a bearing seat, wherein the bearing seat is sleeved on the second roller bearing, and the bearing seat is arranged at the rear end of the shaft sleeve.
2. The motorized spindle of claim 1, wherein:
the central angle of the cooling groove is larger than 180 degrees.
3. An electric spindle according to claim 2, characterized in that:
The central angle of the cooling groove is 330 degrees.
4. The motorized spindle of claim 1, wherein:
the cooling groove is coaxially arranged with the shaft sleeve.
5. The motorized spindle of any one of claims 1 to 4, wherein:
still be provided with first sealing washer installation position, second sealing washer installation position and third sealing washer installation position on the periphery wall of axle sleeve, follow in the axial of axle sleeve, first sealing washer installation position with second sealing washer installation position is located respectively the both ends of runner, third sealing washer installation position is located the second sealing washer installation position is outer keep away from one side of first sealing washer installation position, the entry setting is being close to in the runner of second sealing washer installation position, the export setting is in between second sealing washer installation position and the third sealing washer installation position.
6. The motorized spindle of claim 5, wherein:
and the cooling groove is positioned at one side, far away from the second sealing ring, outside the third sealing ring installation position along the axial direction of the shaft sleeve.
7. The utility model provides an electric spindle, includes casing, axle sleeve, stator, rotor, axle core, preceding bearing assembly and back bearing assembly, follows in the axial of axle sleeve, set gradually preceding bearing chamber, motor room and back bearing chamber in the axle sleeve, preceding bearing assembly sets up in the preceding bearing chamber, the stator cover is established on the rotor, the stator with the rotor sets up in the motor chamber, back bearing assembly sets up in the back bearing chamber, the axle core is followed the axial of stator passes and with stator fixed connection, its characterized in that:
the shaft sleeve is provided with a circular arc-shaped cooling groove on the inner peripheral wall of the rear bearing chamber, two ends of the cooling groove are not communicated, and a partition wall is arranged between the starting end and the ending end of the cooling groove;
An inlet and an outlet which are communicated with the cooling groove are formed in the peripheral wall of the shaft sleeve, the inlet is communicated with the starting end of the cooling groove, and the outlet is communicated with the ending end of the cooling groove;
The shaft sleeve is provided with a first communication hole and a second communication hole which extend along the axial direction of the shaft sleeve, the first communication hole communicates the inlet with the initial end of the cooling groove, and the second communication hole communicates the outlet with the final end of the cooling groove;
A spiral runner is arranged on the peripheral wall of the shaft sleeve, and extends from the peripheral wall of the front bearing chamber to the peripheral wall of the junction of the motor chamber and the rear bearing chamber;
the cooling liquid inlet, the runner, the inlet, the first communication hole, the cooling groove, the second communication hole, the outlet and the cooling liquid outlet of the electric spindle are sequentially communicated, and after entering the electric spindle from the cooling liquid inlet, the cooling liquid sequentially cools the front bearing assembly, the stator and the rear bearing assembly and finally flows out from the cooling liquid outlet;
The front bearing assembly comprises a first roller bearing and an angular contact ball bearing, the first roller bearing and the angular contact ball bearing are coaxially arranged, and the first roller bearing and the angular contact ball bearing are mounted at the front end of the shaft sleeve;
the front bearing assembly comprises one first roller bearing and two angular contact ball bearings, and the first roller bearing is a double-row first roller bearing;
The rear bearing assembly comprises a second roller bearing and a bearing seat, wherein the bearing seat is sleeved on the second roller bearing, and the bearing seat is arranged at the rear end of the shaft sleeve.
8. The motorized spindle of claim 7, wherein:
the central angle of the cooling groove is larger than 180 degrees.
9. The motorized spindle of claim 8, wherein:
The central angle of the cooling groove is 330 degrees.
10. The motorized spindle of claim 7, wherein:
the cooling groove is coaxially arranged with the shaft sleeve.
11. The motorized spindle of claim 10, wherein:
The outer peripheral wall of the shaft sleeve is also provided with a first sealing ring installation position, a second sealing ring installation position and a third sealing ring installation position, the first sealing ring installation position and the second sealing ring installation position are respectively positioned at two ends of the flow channel along the axial direction of the shaft sleeve, the third sealing ring installation position is positioned at one side, far away from the first sealing ring installation position, outside the second sealing ring installation position, the inlet is arranged in the flow channel close to the second sealing ring installation position, and the outlet is arranged between the second sealing ring installation position and the third sealing ring installation position;
a first sealing ring is arranged in the first sealing ring installation position, a second sealing ring is arranged in the second sealing ring installation position, and a third sealing ring is arranged in the third sealing ring installation position;
The shell is provided with a cooling liquid inlet and a cooling liquid outlet, the cooling liquid inlet is communicated with one end, close to the first sealing ring, of the flow channel, and the cooling liquid outlet is located between the second sealing ring and the third sealing ring.
12. The motorized spindle of claim 11, wherein:
and the cooling groove is positioned at one side, far away from the second sealing ring, outside the third sealing ring installation position along the axial direction of the shaft sleeve.
13. The motorized spindle of claim 7, wherein:
The bearing seat is characterized in that a first annular mounting groove and a second annular mounting groove are formed in the peripheral wall of the bearing seat, the cooling groove is located between the first annular mounting groove and the second annular mounting groove, a fourth sealing ring is arranged in the first annular mounting groove, and a fifth sealing ring is arranged in the second annular mounting groove.
14. The motorized spindle of claim 7, wherein:
The side wall of the bearing seat is provided with a wire passing hole along the axial direction of the bearing seat.
15. A machine tool, characterized in that:
an electric spindle comprising any one of claims 7 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811485301.2A CN109590488B (en) | 2018-12-05 | 2018-12-05 | Bushings, electric spindles and machine tools |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811485301.2A CN109590488B (en) | 2018-12-05 | 2018-12-05 | Bushings, electric spindles and machine tools |
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| CN109590488A CN109590488A (en) | 2019-04-09 |
| CN109590488B true CN109590488B (en) | 2024-11-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110052890A (en) * | 2019-05-27 | 2019-07-26 | 哈尔滨理工大学 | A kind of two-way double helix cooling jacket |
| CN114211305B (en) * | 2021-12-22 | 2023-03-21 | 珠海格力电器股份有限公司 | Axial and circumferential combined cooling structure for electric spindle, electric spindle and machine tool |
| CN116038420A (en) * | 2022-12-23 | 2023-05-02 | 大族激光科技产业集团股份有限公司 | Cooling components and motor installation structure |
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| CN202640128U (en) * | 2012-04-19 | 2013-01-02 | 无锡诚石轴承有限公司 | Motorized spindle sleeve mechanism |
| CN103567468A (en) * | 2013-09-16 | 2014-02-12 | 浙江日发精密机械股份有限公司 | Two-channel water-cooling electric spindle of digital controlled lathe |
| CN108015303A (en) * | 2017-12-13 | 2018-05-11 | 广州市昊志机电股份有限公司 | A kind of permanent-magnet synchronous milling electro spindle |
| CN209255853U (en) * | 2018-12-05 | 2019-08-16 | 珠海格力电器股份有限公司 | Shaft sleeve, electric spindle and machine tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010045905A (en) * | 2008-08-12 | 2010-02-25 | Ntn Corp | Motor integrated magnetic bearing apparatus |
| CN204545441U (en) * | 2014-12-10 | 2015-08-12 | 广州市昊志机电股份有限公司 | Novel electric spindle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202640128U (en) * | 2012-04-19 | 2013-01-02 | 无锡诚石轴承有限公司 | Motorized spindle sleeve mechanism |
| CN103567468A (en) * | 2013-09-16 | 2014-02-12 | 浙江日发精密机械股份有限公司 | Two-channel water-cooling electric spindle of digital controlled lathe |
| CN108015303A (en) * | 2017-12-13 | 2018-05-11 | 广州市昊志机电股份有限公司 | A kind of permanent-magnet synchronous milling electro spindle |
| CN209255853U (en) * | 2018-12-05 | 2019-08-16 | 珠海格力电器股份有限公司 | Shaft sleeve, electric spindle and machine tool |
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