CN111473053B - Shaft assembly and transmission system - Google Patents
Shaft assembly and transmission system Download PDFInfo
- Publication number
- CN111473053B CN111473053B CN202010514678.7A CN202010514678A CN111473053B CN 111473053 B CN111473053 B CN 111473053B CN 202010514678 A CN202010514678 A CN 202010514678A CN 111473053 B CN111473053 B CN 111473053B
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- Prior art keywords
- liquid
- bearing
- upper liquid
- rotating shaft
- channel
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 188
- 239000000110 cooling liquid Substances 0.000 claims description 49
- 238000001816 cooling Methods 0.000 claims description 36
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000020347 spindle assembly Effects 0.000 description 5
- 239000012809 cooling fluid Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C37/00—Cooling of bearings
- F16C37/007—Cooling of bearings of rolling bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
- F16H57/0417—Heat exchangers adapted or integrated in the gearing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention relates to the field of installation and support of rotating shafts, and provides a rotating shaft assembly and a transmission system. The rotating shaft assembly comprises a supporting unit and a rotating shaft, the supporting unit comprises a bearing seat, the rotating shaft is supported on the bearing seat through a bearing, a first liquid feeding structure and a second liquid feeding structure are arranged on at least one side of the bearing along the axial direction of the rotating shaft, the first liquid feeding structure is fixed with the rotating shaft, the second liquid feeding structure is fixed with the bearing seat, a first annular cavity surrounding the rotating shaft is formed between the first liquid feeding structure and the second liquid feeding structure, the first liquid feeding structure is provided with a first liquid feeding channel, the second liquid feeding structure is provided with a second liquid feeding channel, the first liquid feeding channel and the second liquid feeding channel are both communicated to the first annular cavity, a liquid outlet of the first liquid feeding channel faces to a first liquid throwing section of the bearing, the first liquid throwing section is located at the front end of the first liquid feeding structure along the axial direction of the rotating shaft, and the first liquid throwing section is inclined towards the radial outer side. The heat dissipation efficiency of the rotating shaft assembly is improved, and the rotating shaft is guaranteed to operate well.
Description
Technical Field
The invention relates to the field of installation and support of rotating shafts, in particular to a rotating shaft assembly and a transmission system.
Background
The ball screw nut pair is easy to generate more heat during high-speed operation, and the main heat generating sources of the ball screw nut pair comprise the matching position of the nut and the screw rod and the supporting position of the screw rod.
In order to reduce the temperature of the ball screw nut pair at the screw supporting position, the prior art is provided with a cooling structure at the screw supporting position, and cooling liquid is conducted through the cooling structure.
Some prior art locate cooling structure on the lead screw, through forming the passageway of carrying the coolant liquid for the processing of lead screw cavity, however, the passageway of carrying the coolant liquid is processed on the lead screw the degree of difficulty is great to the structural strength of lead screw is easily influenced.
Other prior art locate the cooling structure on the bearing housing supporting the lead screw, however, the cooling effect of such bearings is poor.
Disclosure of Invention
One of the objects of the present invention is to provide a spindle assembly with good cooling effect.
The rotating shaft assembly comprises a supporting unit and a rotating shaft, wherein the supporting unit comprises a bearing seat, the rotating shaft is supported on the bearing seat through a bearing, the bearing seat is provided with a cylinder cavity, the bearing is positioned in the cylinder cavity, at least one side of the bearing is provided with a first liquid feeding structure and a second liquid feeding structure along the axial direction of the rotating shaft, the first liquid feeding structure is fixed with the rotating shaft, the second liquid feeding structure is fixed with the bearing seat, a first annular cavity revolving around the rotating shaft is formed between the first liquid feeding structure and the second liquid feeding structure, the first liquid feeding structure is provided with a first liquid feeding channel, the second liquid feeding structure is provided with a second liquid feeding channel, the first liquid feeding channel and the second liquid feeding channel are both communicated with the first annular cavity, the first liquid feeding channel is provided with a first liquid throwing section, the liquid outlet of which faces the bearing, the direction of the bearing is directed from the first liquid feeding structure along the axial direction of the rotating shaft, the first liquid throwing section is positioned at the front end of the first liquid feeding structure, and the first liquid throwing section is inclined towards the radial outside.
Therefore, the cooling liquid is supplied to the first upper liquid channel through the external cooling liquid of the second upper liquid channel through the structural design of the rotating shaft assembly, and the first upper liquid channel is provided with the first liquid throwing section, so that the cooling liquid is sprayed to the bearing from the first liquid throwing section under the action of the centrifugal force of the rotating shaft, the circulation rate of the cooling liquid in the bearing seat cylinder cavity is improved, the heat generated at the supporting position of the rotating shaft is taken away quickly, the heat dissipation efficiency of the rotating shaft assembly is improved, the rotating shaft is guaranteed to operate well, the hollow upper liquid hole path is not needed to be machined on the rotating shaft, the structural strength of the rotating shaft is improved, and the machining difficulty of the upper liquid channel is reduced.
In a preferred embodiment, the first liquid feeding structure is in contact with the inner ring of the bearing and/or the second liquid feeding structure is in contact with the outer ring of the bearing along the axial direction of the rotating shaft.
Therefore, the first liquid feeding structure and the second liquid feeding structure respectively provide axial positioning for the inner ring and the outer ring of the bearing, so that the number of parts of the rotating shaft assembly is reduced, and the rotating shaft assembly is simple in structure.
In another preferred embodiment, the first annular chamber is formed by an annular groove formed in the peripheral wall of the first liquid-feeding structure.
From the above, this is favorable to reducing first ring chamber processing degree of difficulty.
In still another preferred embodiment, the first liquid feeding structure is in clearance fit with the second liquid feeding structure, and a second annular cavity is formed between the first liquid feeding structure and the second liquid feeding structure, and the second annular cavity is located on the liquid leakage side of the first annular cavity.
Therefore, the external sundries are prevented from entering the cylinder cavity of the bearing seat, and the operation of the bearing is prevented from being influenced by the external sundries.
The wall surface of the second annular cavity, which is close to one side of the first annular cavity, is a step surface.
From the above, this is further advantageous in improving the ability of the second annular chamber to retain external debris.
Still another preferable embodiment is that the rotation shaft is a screw shaft.
The bearing unit further comprises a lower liquid structure, the lower liquid structure is located on one side, away from the first upper liquid structure and the second upper liquid structure, of the bearing along the axial direction of the rotating shaft, the lower liquid structure is fixed with the bearing seat, the lower liquid structure is provided with a lower liquid channel, and the lower liquid channel is provided with a second liquid throwing section extending along the radial direction.
Therefore, the cooling liquid circulation channel is formed, the cooling liquid flows out of the cylinder cavity of the bearing seat at a high speed, the circulation rate of the cooling liquid in the cylinder cavity of the bearing seat is improved, and the rapid heat dissipation of the rotating shaft assembly is further facilitated.
In another preferred scheme, one end, close to the bearing, of the first liquid feeding structure is provided with an inclined end face facing the bearing, a liquid outlet of the first liquid throwing section is positioned on the inclined end face, and the depth direction of the first liquid throwing section is along the normal direction of the inclined end face.
Therefore, the processing difficulty of the first liquid throwing section is reduced.
The bearing seat comprises an outer seat and an inner seat, the inner seat is cylindrical, the outer seat is fixedly sleeved on the periphery of the inner seat, the bearing is arranged in a cylindrical cavity of the inner seat, a first cooling channel is formed between the outer seat and the inner seat, and the first cooling channel is provided with a cooling liquid inlet and a cooling liquid outlet.
Therefore, the cooling liquid is introduced into the first cooling channel, so that the bearing seat is cooled, the rotating shaft assembly is further facilitated to rapidly dissipate heat, and the rotating shaft is further facilitated to smoothly run.
The further scheme is that the cooling liquid inlet and the cooling liquid outlet are all arranged on the outer seat.
Further, the first cooling channel is arranged around the outer peripheral wall of the inner seat, and the first cooling channel extends spirally along the axial direction of the rotating shaft.
Therefore, the cooling liquid is favorably guided to flow sequentially, the cooling liquid is favorably guided to flow into and flow out of the first cooling channel sequentially, the high-temperature cooling liquid is favorably prevented from being detained in the first cooling channel, and the bearing seat is further favorably cooled down rapidly.
The further scheme is that along the axial direction of the rotating shaft, sealing rings are arranged on two sides of the first cooling channel, and the sealing rings are extruded between the outer seat and the inner seat.
As can be seen from the above, this is advantageous in order to avoid leakage of the cooling liquid in the first cooling channel.
In a further preferred scheme, the cross-sectional area of the first liquid throwing section is smaller than that of other positions of the first liquid feeding channel, and the cross-sectional area of the first liquid throwing section is smaller than that of the second liquid feeding channel.
In another preferred scheme, the liquid inlet of the second liquid feeding channel is provided with a liquid feeding one-way valve, or an external liquid path communicated with the second liquid feeding channel is provided with a liquid feeding one-way valve.
Therefore, the cooling liquid in the first upper liquid channel is prevented from throwing liquid to the second upper liquid channel under the action of centrifugal force, the cooling liquid is prevented from flowing along the opposite direction of the upper liquid direction, negative pressure suction can be generated in the first liquid throwing section after the cooling liquid in the first upper liquid channel is thrown to the bearing through the first liquid throwing section, and the cooling liquid is pumped from the external liquid source through the second upper liquid channel by the negative pressure suction, so that the cooling liquid can flow in the cylinder cavity of the bearing seat quickly without the need of providing pressure by the external liquid source, the rotating shaft assembly can be cooled quickly, and the rotating shaft can be guaranteed to operate well.
It is a further object of the present invention to provide a transmission system with good cooling.
In order to achieve the above purpose, the transmission system provided by the invention comprises a motor and the rotating shaft assembly, wherein the rotating shaft is in transmission connection with an output shaft of the motor.
Therefore, the adoption of the rotating shaft assembly is beneficial to the rapid heat dissipation of the rotating shaft supporting part and the smooth operation of the rotating shaft.
In a preferred embodiment, the bearing support has a fixing part, which is fixedly connected to the housing of the electric machine and has a second cooling channel.
Therefore, the heat of the motor is prevented from being conducted to the bearing seat through the fixing part, and then conducted to the bearing, and the heat of the motor is prevented from affecting the operation of the rotating shaft.
Drawings
FIG. 1 is a block diagram of an embodiment of a transmission system of the present invention;
FIG. 2 is a partial cross-sectional view through the first feed passage 41 and the axis of the screw 500 of the drive train embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a partial enlarged view at B in FIG. 2;
FIG. 5 is a block diagram of the first movable end cap 4 of the spindle assembly of the present invention;
FIG. 6 is a partial cross-sectional view of the subcooled liquid inlet 224, the liquid coolant outlet and the screw 500 axis of a drive train embodiment of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 6 at C;
FIG. 8 is a block diagram of the inner housing 22 of the spindle assembly of the present invention;
Fig. 9 is a cross-sectional view of the fixing portion 211 of the spindle assembly of the present invention taken along the direction X in the normal direction.
Detailed Description
Spindle assembly and drive train embodiments:
Referring to fig. 1 to 5, the transmission system of the present embodiment includes a motor 200 and a rotating shaft assembly of the present embodiment, the motor 200 includes a casing 201 and an output shaft 202, the rotating shaft assembly includes a screw rod 500 and a supporting unit 100, and the supporting unit 100 includes a bearing 1, a bearing seat 2, a first movable end cover 4, a first fixed end cover 5, a second movable end cover 7, a first lock nut 8 and a second lock nut 6.
Referring to fig. 1, a screw rod 500 of the present embodiment is a rotating shaft, two supporting units 100 are provided, the two supporting units are respectively a supporting unit 100a and a supporting unit 100b, the supporting unit 100a and the supporting unit 100b are respectively supported at two ends of the screw rod 500 in an axial direction X, an output shaft 202 of a motor 200 is fixedly connected with one end of the screw rod 500 supported by the supporting unit 100a through a coupling 400, a bearing seat 2 of the supporting unit 100a has a fixing portion 211, the bearing seat 2 of the supporting unit 100b has no fixing portion 211, the fixing portion 211 is fixedly connected with a casing 201 of the motor 200 through a screw 3, and the main structures of the supporting unit 100a and the supporting unit 100b are the same.
Alternatively, in other embodiments of the present invention, the shaft may be a shaft other than the screw 500.
Referring to fig. 2, the bearing housing 2 includes an inner housing 22 and an outer housing 21, the outer housing 21 is fixedly sleeved on an outer peripheral wall of the inner housing 22, the inner housing 22 is cylindrical, the bearing 1 is located in a cylindrical cavity 223 of the inner housing 22, a screw rod 500 passes through an inner ring of the bearing 1, and the screw rod 500 is supported on an inner wall of the cylindrical cavity 223 of the inner housing 22 through the bearing 1.
Referring to fig. 2, the first lock nut 8 and the second lock nut 6 are respectively connected with the screw rod 500 by threads, and the first fixed end cover 5 is fixedly connected with the inner seat 22 by screws.
Referring to fig. 2, along the axial direction X of the screw rod 500, one end of the inner seat 22 has a positioning ring 222 protruding radially inwards, the positioning ring 222, the outer ring of the bearing 1 and the first fixed end cap 5 are sequentially abutted, and the first lock nut 8, the second movable end cap 7, the inner ring of the bearing 1, the first movable end cap 4 and the second lock nut 6 are sequentially abutted and fixed.
Referring to fig. 3 and 5, a first annular cavity 42 is formed between the first movable end cover 4 and the first fixed end cover 5 around the screw 500 for one circle, and specifically, the first annular cavity 42 is formed by an annular groove formed on the outer peripheral wall of the first movable end cover 4.
Referring to fig. 3, the first movable end cover 4 of the present embodiment is of a first upper liquid structure, the first movable end cover 4 has a first upper liquid channel 41, the first upper liquid channel 41 includes a first radial section 411, a first axial section 412 and a first liquid throwing section 413 which are sequentially communicated, the first radial section 411 is directly communicated with the first annular cavity 42, the first liquid throwing section 413 is located at the front end of the first movable end cover 4 along the axial direction X of the screw rod 500 from the first movable end cover 4 to the direction of the bearing 1, the first liquid throwing section 413 is inclined towards the radial outside, and the liquid outlet of the first liquid throwing section 413 is towards the bearing 1.
Referring to fig. 3, the first end cap 5 of the present embodiment is of a second liquid feeding structure, the first end cap 5 has a second liquid feeding channel 51, the second liquid feeding channel 51 includes a second radial section 511, a second axial section 512 and a third radial section 513 which are sequentially communicated, the second radial section 511 is communicated to the outside of the first end cap 5, and the third radial section 513 is communicated to the first annular cavity 42.
Alternatively, in other embodiments of the present invention, the first liquid feeding structure may be integrally formed with the screw 1, and the second liquid feeding structure may be integrally formed with the inner seat 22, which is, of course, disadvantageous in that the first liquid feeding channel 41 is formed on the first liquid feeding structure, and also disadvantageous in that the second liquid feeding channel 51 is formed on the second liquid feeding structure, so that it is preferable that the first liquid feeding structure is disposed separately from the screw 500, and that the second liquid feeding structure is disposed separately from the inner seat 22.
Alternatively, in other embodiments of the invention, the axial positioning of the bearing 1 may be achieved with other arrangements, the first and second liquid-feeding arrangements being used only for introducing cooling liquid into the barrel cavity 223 of the inner seat 22.
Alternatively, in other embodiments of the present invention, the inner ring of the bearing 1 is interference fit with the screw rod 500, the outer ring of the bearing 1 is interference fit with the inner seat 22, and the bearing 1 does not need to be axially limited in this case when the bearing 1 is not axially loaded, and the first movable end cover 4 and the first fixed end cover 5 may not have an effect on the axially limited position of the bearing 1.
Of course, the cooling fluid introduced into the cylindrical cavity 223 of the inner housing 22 preferably also has a lubricating function.
Referring to fig. 4, the positioning ring 222 is of a liquid-down structure, the positioning ring 222 has a liquid-down channel 2221, the liquid-down channel 2221 includes a fourth radial segment 22211 and a third axial segment 22212 that are sequentially communicated, the fourth radial segment 22211 of the present embodiment is a second liquid-throwing segment, the fourth radial segment 22211 is communicated to the barrel cavity 223 of the inner seat 22, and the third axial segment 22212 is communicated to the axial outer side of the inner seat 22.
Alternatively, in other embodiments of the present invention, the liquid-discharging structure may be separately disposed from the inner seat 22, and the liquid-discharging structure is fixedly connected to the inner seat 22, which can achieve the object of the present invention.
When the transmission system is in operation, the motor 200 drives the screw rod 500 to rotate, cooling liquid enters the barrel cavity 223 of the inner seat 22 through the second upper liquid channel 51, the first annular cavity 42 and the first upper liquid channel 41 to cool and lubricate the bearing 1, and then flows out of the barrel cavity 223 of the inner seat 22 through the lower liquid channel 2221 to take away heat generated by the supporting unit 100 and the screw rod 1, and when the screw rod 500 rotates, the cooling liquid in the first upper liquid channel 41 can be sprayed to the bearing 1 at a higher speed under the action of centrifugal force due to the first liquid throwing section 413, so that the cooling liquid can flow in the barrel cavity 223 of the inner seat 22 at a higher speed, the cooling liquid can take away heat at the supporting position of the screw rod 500 quickly, and the cooling liquid can be thrown out of the barrel cavity 223 of the inner seat 22 through the lower liquid channel 2221 under the action of centrifugal force, so that the cooling liquid can be further beneficial to speed up the circulation speed in the barrel cavity 223 of the inner seat 22, the cooling liquid can be further beneficial to taking away heat at the supporting position of the screw rod 500 quickly, and the good running state of the screw rod 500 can be beneficial to ensuring.
Alternatively, in other embodiments of the present invention, the drainage structure may be provided with only the drainage channel 2221 penetrating the bearing housing 2 in the radial direction, which can achieve the object of the present invention as well.
Preferably, the liquid inlet of the second liquid feeding channel 51 is provided with a liquid feeding one-way valve (not shown in the figure), which is favorable for preventing the cooling liquid in the first liquid feeding channel 41 from being thrown to the second liquid feeding channel 51 under the action of centrifugal force and preventing the cooling liquid from flowing along the opposite direction of the liquid feeding direction, and in addition, after the cooling liquid in the first liquid feeding channel 41 is thrown to the bearing 1 through the first liquid throwing section 413, the negative pressure suction can be generated in the first liquid throwing section 413, and the cooling liquid is pumped from the external liquid source through the second liquid feeding channel 51 by the negative pressure suction, so that the cooling liquid can be quickly circulated in the cylinder cavity 223 of the inner seat 22 without the external liquid source, the quick cooling of the screw rod 500 supporting position can be realized, and the screw rod 500 can be ensured to perform well.
Alternatively, in other embodiments of the present invention, the liquid feeding check valve may be provided on an external liquid path communicating with the second liquid feeding passage 51, as well as achieve the object of the present invention.
Preferably, referring to fig. 3, the cross-sectional area of the first liquid throwing section 413 is smaller than the cross-sectional areas of other sections of the first upper liquid passage 41, and the cross-sectional area of the first liquid throwing section 413 is smaller than the cross-sectional area of the second upper liquid passage 51, which is further beneficial to accelerating the throwing out of the cooling liquid through the first liquid throwing section 413 and further beneficial to improving the circulation rate of the cooling liquid in the barrel cavity of the inner seat 22.
Preferably, referring to fig. 3, an end of the first movable end cover 4 near the bearing 1 has an inclined end surface 44 facing the bearing 1, and the liquid outlet of the first liquid throwing section 413 is located on the inclined end surface 44. This facilitates the processing of the first fluid removal section 413 by drilling, which facilitates the reduction of the processing difficulty of the first fluid removal section 413, and more preferably, the depth direction of the first fluid removal section 413 is along the normal direction of the inclined end surface 44.
Referring to fig. 3, the outer peripheral wall surface of the first movable end cover 4 is a cylindrical surface, the inner peripheral wall surface of the first fixed end cover 5 is a cylindrical surface, the first annular cavity 42 is formed between the outer peripheral wall surface of the first movable end cover 4 and the inner peripheral wall surface of the first fixed end cover 5, and a gap is formed between the outer peripheral wall surface of the first movable end cover 4 and the inner peripheral wall surface of the first fixed end cover 5, so that friction between the first movable end cover 4 and the first fixed end cover 5 is avoided to influence the operation performance of the screw rod 500, preferably, a second annular cavity 43 surrounding the first movable end cover 4 for a circle is further formed between the outer peripheral wall surface of the first movable end cover 4 and the inner peripheral wall surface of the first fixed end cover 5, the second annular cavity 43 is located on the side of the first annular cavity 42, which is opposite to the bearing 1, and the wall surface of the second annular cavity 43, which is close to the bearing 1, is a step surface, so that when external impurities are present between the first movable end cover 4 and the first fixed end cover 5, the second annular cavity 43 can be accommodated in the second annular cavity 43, so that the external impurities are prevented from invading into the cylindrical cavity of the inner seat 22, and the external impurities 223 is prevented from invading the inner seat 22, and the external impurities from affecting the operation performance of the screw rod 500.
In this embodiment, the inner peripheral wall surface of the first fixed end cap 5 and the outer peripheral wall surface of the first movable end cap are joint surfaces, alternatively, in other embodiments of the present invention, the joint surfaces of the first liquid feeding structure and the second liquid feeding structure may not be main surfaces, for example, the joint surfaces of the first liquid feeding structure and the second liquid feeding structure may be end surfaces along the axial direction X of the screw rod 500, or the joint surfaces of the first liquid feeding structure and the second liquid feeding structure may be tapered surfaces, and of course, the second annular cavity 43 is not necessarily located on the side of the first annular cavity 42 facing away from the bearing 1 along the axial direction X, as long as the second annular cavity 43 is located on the liquid leakage side of the first annular cavity 42, that is, when the cooling liquid in the first annular cavity 42 leaks along the gap between the first movable end cap 4 and the first fixed end cap 5, for example, the liquid leakage side of the first annular cavity 42 is the side facing away from the bearing 1 along the direction X.
Referring to fig. 6 to 8, preferably, the outer circumferential wall of the inner seat 22 is provided with a spiral groove forming a first cooling passage 221 between the outer seat 21 and the inner seat 22, and the outer seat 21 has a cooling liquid inlet 224 and a cooling liquid outlet 225 penetrating to the first cooling passage 221 in a radial direction. The cooling liquid is led into the first cooling channel 221 through the cooling liquid inlet 224 and the cooling liquid outlet 225, and the cooling liquid flows through the first cooling channel 221 to be favorable for taking away the heat of the bearing seat 2, so that the screw rod 500 can be further favorable for ensuring good operation.
Preferably, along the axial direction X of the screw rod 500, both sides of the first cooling channel 221 are provided with sealing rings 9, and the sealing rings 9 are extruded between the outer seat 21 and the inner seat 22. This is advantageous in avoiding leakage of the cooling liquid from the first cooling passage 221.
Alternatively, in other embodiments of the present invention, the spiral groove may be formed on the inner peripheral wall of the outer seat 21, and it is preferable to form the spiral groove on the outer peripheral wall of the inner seat 22, which is beneficial to reducing the difficulty of machining the spiral groove.
Alternatively, in other embodiments of the present invention, the first cooling channel 221 may be formed by channels of other shapes, such as a grid-like channel formed by interlacing two channels in the circumferential direction and the axial direction, and the spiral grooves are of course advantageous for guiding the cooling fluid to flow sequentially, for guiding the cooling fluid to flow into and out of the first cooling channel 221 sequentially, for avoiding the high-temperature cooling fluid from being retained in the first cooling channel 221, and for further facilitating rapid cooling of the bearing housing 2.
Specifically, referring to fig. 9, the fixing portion 211 is located on the outer seat 21, and the fixing portion 211 has a second cooling channel 2111, and the second cooling channel 2111 has an inlet and an outlet corresponding thereto. This is advantageous in avoiding heat of the motor 200 from being conducted to the bearing housing 2 and then to the bearing 1 through the fixing portion 211, and in avoiding heat of the motor 200 from affecting operation of the screw 500.
Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the invention, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the invention, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the invention.
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010514678.7A CN111473053B (en) | 2020-06-08 | 2020-06-08 | Shaft assembly and transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010514678.7A CN111473053B (en) | 2020-06-08 | 2020-06-08 | Shaft assembly and transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111473053A CN111473053A (en) | 2020-07-31 |
| CN111473053B true CN111473053B (en) | 2024-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010514678.7A Active CN111473053B (en) | 2020-06-08 | 2020-06-08 | Shaft assembly and transmission system |
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| JP2013104520A (en) * | 2011-11-16 | 2013-05-30 | Ntn Corp | Lubricating device for rolling bearing |
| CN110325752A (en) * | 2017-03-30 | 2019-10-11 | 株式会社牧野铣床制作所 | Main shaft device |
| CN212272842U (en) * | 2020-06-08 | 2021-01-01 | 珠海格力电器股份有限公司 | Rotating shaft assembly and transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001012481A (en) * | 1999-06-28 | 2001-01-16 | Nsk Ltd | Bearing device |
| JP2006118526A (en) * | 2004-10-19 | 2006-05-11 | Ntn Corp | Lubrication device of rolling bearing |
| JP2009150559A (en) * | 2009-04-10 | 2009-07-09 | Ntn Corp | Lubricating device of rolling bearing |
| JP5840391B2 (en) * | 2011-06-15 | 2016-01-06 | Ntn株式会社 | Rolling bearing device |
| DE112011103515T5 (en) * | 2010-10-19 | 2013-09-26 | Ntn Corporation | ball-bearing |
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2020
- 2020-06-08 CN CN202010514678.7A patent/CN111473053B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10299784A (en) * | 1997-04-30 | 1998-11-10 | Nippon Seiko Kk | Lubrication device for rolling bearing device |
| JP2002081437A (en) * | 2000-07-07 | 2002-03-22 | Komatsu Ltd | Bearing device |
| JP2013104520A (en) * | 2011-11-16 | 2013-05-30 | Ntn Corp | Lubricating device for rolling bearing |
| CN110325752A (en) * | 2017-03-30 | 2019-10-11 | 株式会社牧野铣床制作所 | Main shaft device |
| CN212272842U (en) * | 2020-06-08 | 2021-01-01 | 珠海格力电器股份有限公司 | Rotating shaft assembly and transmission system |
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| CN111473053A (en) | 2020-07-31 |
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