CN103231078B - Device suitable for pre-tightening main shaft bearing of precision machine tool - Google Patents
Device suitable for pre-tightening main shaft bearing of precision machine tool Download PDFInfo
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- CN103231078B CN103231078B CN201310116861.1A CN201310116861A CN103231078B CN 103231078 B CN103231078 B CN 103231078B CN 201310116861 A CN201310116861 A CN 201310116861A CN 103231078 B CN103231078 B CN 103231078B
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- bearing
- inlet passage
- oil cavity
- annular oil
- main shaft
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Abstract
The invention discloses a device suitable for pre-tightening a main shaft bearing of a precision machine tool. The device comprises a main shaft, a lock nut, a gasket, a box body seat, an end cap, a clamp ring and an improved bearing pre-tightening device, wherein the improved bearing pre-tightening device adopts an annular oil cavity structure with a transformed single-side thin-wall end surface; the main shaft penetrates through the end cap, the clamp ring, a bearing B, a shaft sleeve, a bearing A, the gasket and the lock nut from one end to the other end sequentially; and the improved bearing pre-tightening device is mounted between the main shaft and the box body seat. According to the device, a conventional bearing pre-tightening device between the bearing A and the bearing B is improved, so that on one hand, the improved bearing pre-tightening device can be taken as a support of an annular oil cavity D and provides an oil inlet channel, and on the other hand, the device can be taken as a support of the bearing B, so that radial positioning of the bearing B and axial positioning of the main shaft can be achieved, and accordingly, the axial rigidity of the main shaft is improved.
Description
Technical field
The present invention relates to a kind of pre-tightening apparatus being applicable to bearing, more particularly, refer to a kind of device being applicable to precision machine tool main shaft bearing pretension.
Background technology
In order to improve precision and the dynamic characteristic of precision machine tool main shaft, usually need to carry out pretension to bearing.The bearing pre-tightening device of bilateral thin-walled end face structure as shown in Figure 1, this device can make main shaft axial rigidity reduce because of the distortion of thin-walled oil pocket.Main shaft 1 from one end to the other end in turn through end cap 7, hold-down ring 9, B bearing 8, axle sleeve 5, A bearing 4, pad 2A and locking nut 2; Be provided with bearing pre-tightening device between main shaft 1 and housing seat 3, described bearing pre-tightening device includes A annular oil cavity 11, B annular oil cavity 12, A bearing 4, B bearing 8, axle sleeve 5, packing ring 6.
At Fig. 1, Tu1AZhong, the main shaft 1 of high-precision machine tool carries out running at a high speed, in order to ensure the dynamic characteristic of main shaft 1, can supply pressure oil to the A bearing 4 be socketed on main shaft 1 and B bearing 8.The pressure oil introduced from outside enters the oil-in chamber 11E of A the annular oil cavity 11 and oil-in chamber 12E of B annular oil cavity 12 along the first oil inlet passage 3A, described first oil inlet passage 3A is arranged on housing seat 3, first oil inlet passage 3A and the second oil inlet passage 12D conducting, the second oil inlet passage 12D is arranged on the outer ring body 12C of B annular oil cavity 12.In order to realize the sealing between A annular oil cavity 11 and B annular oil cavity 12, be socketed with sealing ring 13 in A annular oil cavity 11 and B annular oil cavity 12 contact position.
The outer ring body 11C of A annular oil cavity 11 and the inwall interference fit of housing seat 3, the inner ring body 11B of A annular oil cavity 11 and one end interference fit of packing ring 6, the base plate 11A of A annular oil cavity 11 and the outer ring 4B interference fit of A bearing 4.
The outer ring body 12C of B annular oil cavity 12 and the inwall interference fit of housing seat 3, the inner ring body 12B of B annular oil cavity 12 and the other end interference fit of packing ring 6, the base plate 12A of B annular oil cavity 12 and the outer ring 8B interference fit of B bearing 8.
The base plate 11A of described A annular oil cavity 11 is thin-wall construction, under the active force of pressure oil, thin-walled (i.e. base plate 11A) is out of shape, thus forms B to axial force, and described B is applied on the outer ring 4B of A bearing 4 to axial force, finally realizes the pretension to A bearing 4;
The base plate 12A of described B annular oil cavity 12 is thin-wall construction, under the active force of pressure oil, thin-walled (i.e. base plate 12A) is out of shape, thus forms A to axial force, and described A is applied on the outer ring 8B of B bearing 8 to axial force, finally realizes the pretension to B bearing 8.
The bearing pre-tightening device of bilateral thin-walled end face structure as shown in Figure 1, be subject to A at the same time to axial force and B under the effect of axial force, the axial rigidity of the main shaft 1 run up is relatively low.
Summary of the invention
In order to the lower defect of main shaft axial rigidity that the oil pocket improving bilateral thin-walled end face structure causes, the present invention devises a kind of device being applicable to precision machine tool main shaft bearing pretension.This device adopts oil pocket deformation of thin membrane to realize bearing pre-tightened, is the oil recess structure with one-sided thin-walled face deformation, which simplify oil recess structure, is convenient to oil pocket processing, installs and sealing.B annular oil cavity 12 replaced by application D annular oil cavity bearing 22, and two end faces of D annular oil cavity bearing 22 directly contact with housing seat 3 with B bearing 8 respectively, when main shaft 1 is subject to B to axial force, the axial rigidity of main shaft 1 can not weaken because of the distortion of C annular oil cavity 21.
A kind of device being applicable to precision machine tool main shaft bearing pretension of the present invention, this device includes main shaft (1), locking nut (2), pad (2A), housing seat (3), end cap (7), hold-down ring (9); It is characterized in that: the bearing pre-tightening device also including improvement;
The bearing pre-tightening device of described improvement includes C annular oil cavity (21), D annular oil cavity (22), A bearing (4), B bearing (8), axle sleeve (5), the second packing ring (25);
C annular oil cavity (21) is provided with base plate (21A), inner ring body (21B), outer ring body (21C), oil-in chamber (21E) between inner ring body (21B) and outer ring body (21C); This oil-in chamber (21E) is for storing pressure oil;
The inwall of inner ring body (21B) coordinates with the outer wall of the column (25B) of the second packing ring (25), and the outer wall of inner ring body (21B) coordinates with the first boss body (22A) of D annular oil cavity (22);
The outer wall of outer ring body (21C) coordinates with the inwall of housing seat (3), and the inwall of outer ring body (21C) coordinates with the first boss body (22A) of D annular oil cavity (22);
D annular oil cavity (22) is provided with the first boss body (22A), the second boss body (22B), the 3rd boss body (22C), linkage section (22D);
First boss body (22A) is provided with groove, and this groove is for placing the second sealing ring (23); First boss body (22A) is provided with the 3rd oil inlet passage (22F), the 3rd oil inlet passage (22F) and the second oil inlet passage (22E) conducting; First boss body (22A) is connected and sealed by the second sealing ring (23) with the openend of C annular oil cavity (21);
Second boss body (22B) is provided with the second oil inlet passage (22E), this second oil inlet passage (22E) and the 4th oil inlet passage (22G) and the 3rd oil inlet passage (22F) conducting; And the openend of the second oil inlet passage (22E) and the first oil inlet passage (3A) conducting; Second boss body (22B) is connected and sealed by the 3rd sealing ring (23) with first boss (31) of housing seat (3);
Linkage section (22D) is provided with the 4th oil inlet passage (22G), and the end of the 4th oil inlet passage (22G) is provided with blocking (24);
Second boss body (22B) is combined with the base plate (25A) of the second packing ring (25) with the joint of the 3rd boss body (22C);
3rd boss body (22C) is combined with the outer ring (8B) of B bearing (8) with the joint of linkage section (22D);
The outer wall of linkage section (22D) coordinates with the inwall of housing seat (3);
Second packing ring (25) is provided with base plate (25A) and column (25B);
One end face of base plate (25A) coordinates with the outer ring (8B) of B bearing (8), and the other end of base plate (25A) coordinates with the longitudinal terminal surface of the second boss body (22B) of D annular oil cavity (22);
The outer wall leading portion of column (25B) coordinates with the outer wall of the inner ring body (21B) of C annular oil cavity (21), and the outer wall back segment of column (25B) coordinates with the transverse end surface of the second boss body (22B) of D annular oil cavity (22).
The advantage with the device of the main shaft bearing pretension of one-sided thin-walled oil recess structure of the present invention is:
1. D annular oil cavity bearing 22 1 aspect designed as C annular oil cavity 21 bearing and oil-feed oil circuit is provided; On the other hand as the bearing of B bearing 8, radial direction and main shaft 1 location in the axial direction of B bearing 8 can be realized.
2. D annular oil cavity bearing 22 is coordinated with the existing circular radial cylinder of the connection of housing seat 3 and is compressed from end face by hold-down ring 9, ensure that connection reliability and main shaft axial location rigidity.
3. adopt the oil recess structure of one-sided thin-walled face deformation, simplify oil recess structure, be convenient to oil pocket processing, install and sealing.This oil recess structure makes the outer ring 8B end face of B bearing 8 directly contact with the end face of D annular oil cavity bearing 22, when main shaft be subject to B to axial force time, its axial rigidity can not weaken because of the distortion of C annular oil cavity 21.
Accompanying drawing explanation
Fig. 1 is the bearing pre-tightening device of bilateral thin-walled end face structure.
Figure 1A is the enlarged drawing of the bearing pre-tightening device part in Fig. 1.
Fig. 2 is the device being applicable to precision machine tool main shaft bearing pretension of the present invention.
Fig. 2 A is the enlarged drawing of the bearing pre-tightening device part of improvement in Fig. 2.
Fig. 3 is the structure chart of C annular oil cavity of the present invention.
Fig. 3 A is the sectional structure chart of C annular oil cavity of the present invention.
Fig. 4 is the structure chart of D annular oil cavity of the present invention.
Fig. 4 A is the sectional structure chart of D annular oil cavity of the present invention.
Fig. 5 is the structure chart of the present invention second packing ring.
| 1. main shaft | 2. locking nut | 2A. pad |
| 3. housing seat | 3A. first oil inlet passage | 31. first boss |
| 4.A bearing | 4A. inner ring | 4B. outer ring |
| 5. axle sleeve | 6. packing ring | 7. end cap |
| 8.B bearing | 8A. inner ring | 8B. outer ring |
| 9. hold-down ring | 11.A annular oil cavity | 11A. base plate |
| 11B. inner ring body | 11C. outer ring body | 11E. oil-in chamber |
| 12.B annular oil cavity | 12A. base plate | 12B. inner ring body |
| 12C. outer ring body | 12D. second oil inlet passage | 12E. oil-in chamber |
| 13. first sealing rings | 21.C annular oil cavity | 21A. base plate |
| 21B. inner ring body | 21C. outer ring body | 21E. oil-in chamber |
| 22.D annular oil cavity | 22A. first boss body | 22B. second boss body |
| 22C. the 3rd boss body | 22D. linkage section | 22E. second oil inlet passage |
| 22F. the 3rd oil inlet passage | 22G. the 4th oil inlet passage | 23. the 3rd sealing rings |
| 24. blockings | 25. second packing rings | 25A. base plate |
| 25B. column | 26. second sealing rings | ? |
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Shown in Fig. 2, Fig. 2 A, a kind of device being applicable to precision machine tool main shaft bearing pretension of the present invention, the bearing pre-tightening device that this device includes main shaft 1, locking nut 2, pad 2A, housing seat 3, end cap 7, hold-down ring 9 and improves;
The bearing pre-tightening device of described improvement includes C annular oil cavity 21, D annular oil cavity 22, A bearing 4, B bearing 8, axle sleeve 5, second packing ring 25.
In the present invention, the bearing pre-tightening device of described improvement is the annular oil cavity structure of one-sided thin-walled face deformation.
C annular oil cavity 21
Shown in Fig. 2, Fig. 2 A, Fig. 3, Fig. 3 A, C annular oil cavity 21 is provided with base plate 21A, inner ring body 21B, outer ring body 21C; Oil-in chamber 21E between inner ring body 21B and outer ring body 21C, this oil-in chamber 21E is for storing pressure oil; The middle part of C annular oil cavity 21 is through hole 21D, and the column 25B that this through hole 21D is used for the second packing ring 25 passes;
The inwall of inner ring body 21B coordinates with the outer wall of the column 25B of the second packing ring 25, and the outer wall of inner ring body 21B coordinates with the first boss body 22A of D annular oil cavity 22;
The outer wall of outer ring body 21C coordinates with the inwall of housing seat 3, and the inwall of outer ring body 21C coordinates with the first boss body 22A of D annular oil cavity 22;
In order to realize the sealing between C annular oil cavity 21 and the first boss body 22A of D annular oil cavity 22, at the joint of inner ring body 21B, the outer ring body 21C of C annular oil cavity 21 and the first boss body 22A of D annular oil cavity 22, second sealing ring 26 is installed; Second sealing ring 26 is placed in the groove on the first boss body 22A.
In the present invention, the base plate 21A of C annular oil cavity 21 is thin-wall construction, the pressure oil introduced from outside enters in the oil-in chamber 21E of C annular oil cavity 21 along the first oil inlet passage 3A, the 4th oil inlet passage 22G, the second oil inlet passage 22E, the 3rd oil inlet passage 22F, because the base plate 21A of C annular oil cavity 21 is thinner, under the active force of pressure oil, make the micro-strain of thin-walled base plate form B to axial force, described B is applied on the outer ring of A bearing 4 to axial force, thus realizes the pretension to A bearing 4.The preloaded bearing device that the present invention designs can change the pretightning force to A bearing 4, to adapt to the requirement of different main rotating speed to bearing pre-tightened by the stool and urine of adjustment charge oil pressure.
D annular oil cavity 22
Shown in Fig. 2, Fig. 2 A, Fig. 4, Fig. 4 A, D annular oil cavity 22 is provided with the first boss body 22A, the second boss body 22B, the 3rd boss body 22C, linkage section 22D; The center of D annular oil cavity 22 is through hole 22E;
First boss body 22A is provided with groove, and this groove is for placing the second sealing ring 26; First boss body 22A is provided with the 3rd oil inlet passage 22F, the 3rd oil inlet passage 22F and the second oil inlet passage 22E conducting; The openend of the first boss body 22A and C annular oil cavity 21 is connected and sealed by the second sealing ring 26;
Second boss body 22B is provided with the second oil inlet passage 22E, this second oil inlet passage 22E and the 4th oil inlet passage 22G and the 3rd oil inlet passage 22F conducting; And the openend of the second oil inlet passage 22E and the first oil inlet passage 3A conducting; First boss 31 of the second boss body 22B and housing seat 3 is connected and sealed by the 3rd sealing ring 23;
Linkage section 22D is provided with the 4th oil inlet passage 22G, and the end of the 4th oil inlet passage 22G is provided with blocking 24;
The joint of the second boss body 22B and the 3rd boss body 22C is combined with the base plate 25A of the second packing ring 25;
The joint of the 3rd boss body 22C and linkage section 22D is combined with the outer ring 8B of B bearing 8;
The outer wall of linkage section 22D coordinates with the inwall of housing seat 3.
In the present invention, D annular oil cavity 22 designs for segmental structure, D annular oil cavity 22 is coordinated with the existing circular radial cylinder of the connection of housing seat 3 and is compressed from end face by hold-down ring 9, ensure that D annular oil cavity 22 and the connection reliability between housing seat 3 and B bearing 8, also ensure that B bearing 8 is at main shaft locating stiffness axially simultaneously.
Second packing ring 25
Shown in Fig. 2, Fig. 2 A, Fig. 5, the second packing ring 25 is T-shaped structure, and the second packing ring 25 is provided with base plate 25A and column 25B; The center of the second packing ring 25 is through hole 25C;
One end face of base plate 25A coordinates with the outer ring 8B of B bearing 8, and the other end of base plate 25A coordinates with the longitudinal terminal surface of the second boss body 22B of D annular oil cavity 22;
The outer wall leading portion of column 25B coordinates with the outer wall of the inner ring body 21B of C annular oil cavity 21, and the outer wall back segment of column 25B coordinates with the axial end of the second boss body 22B of D annular oil cavity 22.
In the present invention, the second packing ring 25 1 aspect achieves separating between A bearing 4 and B bearing 8, achieves the tight fit between C annular oil cavity 21 and D annular oil cavity 22 on the other hand.
In the present invention, the bearing pre-tightening device one of improvement be as D annular oil cavity 22 bearing and oil-feed oil circuit is provided; Two is the bearings as B bearing 8, and can realize radial direction and the main shaft axial location of B bearing 8.D annular oil cavity 22 is coordinated with the existing circular radial cylinder of the connection of housing seat 3 and is compressed from end face by screw, ensure that connection reliability and main shaft axial location rigidity; Adopt the C annular oil cavity 21 of one-sided thin-walled face deformation, its structure simplifies oil recess structure, be convenient to oil pocket processing, install and sealing, the more important thing is, this structure makes the cycle surface of A bearing 4 directly contact with the base plate of C annular oil cavity 21, when main shaft 1 be subject to B to axial force time, its axial rigidity can not weaken because of the distortion of C annular oil cavity 21.
In the present invention, housing seat 3 is provided with the first oil inlet passage 3A, and this first oil inlet passage 3A and the 4th oil inlet passage 22G(is arranged on D annular oil cavity 22) conducting.First boss 31 place of housing seat 3 is for placing the bearing pre-tightening device of improvement.
In the present invention, main shaft 1 from one end to the other end in turn through end cap 7, hold-down ring 9, B bearing 8, axle sleeve 5, A bearing 4, pad 2A and locking nut 2; The bearing pre-tightening device of improvement is installed between main shaft 1 and housing seat 3.
Separated by axle sleeve 5, the bearing pre-tightening device that improves between A bearing 4 and B bearing 8.
A kind of device adopting oil pocket deformation of thin membrane to realize being applicable to precision machine tool main shaft bearing pretension of the present invention's design, the pressure oil introduced from outside enters C annular oil cavity 21 along the first oil inlet passage 3A, the base plate 21A of C annular oil cavity 21 is thin-wall construction, the active force of pressure oil is applied to the outer ring 4B of A bearing 4 by the micro-strain of thin-walled, thus realizes the pretension to A bearing 4.Regulate the pretightning force of large I change to A bearing 4 of charge oil pressure, to adapt to the requirement of different main rotating speed to bearing pre-tightened.
Claims (1)
1. be applicable to a device for precision machine tool main shaft bearing pretension, this device includes main shaft (1), locking nut (2), pad (2A), housing seat (3), end cap (7), hold-down ring (9); It is characterized in that: the bearing pre-tightening device also including improvement;
The bearing pre-tightening device of described improvement includes C annular oil cavity (21), D annular oil cavity (22), A bearing (4), B bearing (8), axle sleeve (5), the second packing ring (25);
C annular oil cavity (21) is provided with base plate (21A), inner ring body (21B), outer ring body (21C), is oil-in chamber (21E) between inner ring body (21B) and outer ring body (21C); This oil-in chamber (21E) is for storing pressure oil;
The inwall of inner ring body (21B) coordinates with the outer wall leading portion of the column (25B) of the second packing ring (25), and the outer wall of inner ring body (21B) coordinates with the first boss body (22A) of D annular oil cavity (22);
The outer wall of outer ring body (21C) coordinates with the inwall of housing seat (3), and the inwall of outer ring body (21C) coordinates with the first boss body (22A) of D annular oil cavity (22);
D annular oil cavity (22) is provided with the first boss body (22A), the second boss body (22B), the 3rd boss body (22C), linkage section (22D);
First boss body (22A) is provided with groove, and this groove is for placing the second sealing ring (26); First boss body (22A) is provided with the 3rd oil inlet passage (22F), the 3rd oil inlet passage (22F) and the second oil inlet passage (22E) conducting; First boss body (22A) is connected and sealed by the second sealing ring (26) with the openend of C annular oil cavity (21);
Second boss body (22B) is provided with the second oil inlet passage (22E), this second oil inlet passage (22E) and the 4th oil inlet passage (22G) and the 3rd oil inlet passage (22F) conducting; And the openend of the second oil inlet passage (22E) and the first oil inlet passage (3A) conducting; Second boss body (22B) is connected and sealed by the 3rd sealing ring (23) with first boss (31) of housing seat (3);
Linkage section (22D) is provided with the 4th oil inlet passage (22G), and the end of the 4th oil inlet passage (22G) is provided with blocking (24);
Second boss body (22B) is combined with the base plate (25A) of the second packing ring (25) with the joint of the 3rd boss body (22C);
3rd boss body (22C) is combined with the outer ring (8B) of B bearing (8) with the joint of linkage section (22D);
The outer wall of linkage section (22D) coordinates with the inwall of housing seat (3);
Second packing ring (25) is provided with base plate (25A) and column (25B);
One end face of base plate (25A) coordinates with the outer ring (8B) of B bearing (8), and the other end of base plate (25A) coordinates with the longitudinal terminal surface of the second boss body (22B) of D annular oil cavity (22);
The outer wall leading portion of column (25B) coordinates with the inwall of the inner ring body (21B) of C annular oil cavity (21), and the outer wall back segment of column (25B) coordinates with the axial end of the second boss body (22B) of D annular oil cavity (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310116861.1A CN103231078B (en) | 2013-04-07 | 2013-04-07 | Device suitable for pre-tightening main shaft bearing of precision machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310116861.1A CN103231078B (en) | 2013-04-07 | 2013-04-07 | Device suitable for pre-tightening main shaft bearing of precision machine tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103231078A CN103231078A (en) | 2013-08-07 |
| CN103231078B true CN103231078B (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310116861.1A Expired - Fee Related CN103231078B (en) | 2013-04-07 | 2013-04-07 | Device suitable for pre-tightening main shaft bearing of precision machine tool |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345040B (en) * | 2015-11-17 | 2017-05-31 | 智伯雄 | It is a kind of for vertical lathe with the device of round nut mode pretension main shaft bearing |
| CN107570732B (en) * | 2017-09-29 | 2024-03-15 | 三明学院 | Numerical control machine tool system with automatic workpiece taking function |
| CN113231657B (en) * | 2021-04-19 | 2022-09-06 | 广州市昊志机电股份有限公司 | Main shaft bearing locking structure, electric main shaft and machine tool |
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| JP3613753B2 (en) * | 1999-03-16 | 2005-01-26 | 株式会社ニイガタマシンテクノ | Spindle device and rolling bearing preload method |
| CN201841272U (en) * | 2010-11-05 | 2011-05-25 | 山东普利森集团有限公司 | Heavy-duty lathe spindle bearing nut pretightening structure |
| CN201988726U (en) * | 2011-03-28 | 2011-09-28 | 广州市昊志机电有限公司 | Bearing pre-tightening structure of high-speed electric main shaft |
| JP2012067906A (en) * | 2010-02-16 | 2012-04-05 | Nsk Ltd | Bearing device, main spindle device of machine tool and machine tool |
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2013
- 2013-04-07 CN CN201310116861.1A patent/CN103231078B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3613753B2 (en) * | 1999-03-16 | 2005-01-26 | 株式会社ニイガタマシンテクノ | Spindle device and rolling bearing preload method |
| JP2012067906A (en) * | 2010-02-16 | 2012-04-05 | Nsk Ltd | Bearing device, main spindle device of machine tool and machine tool |
| CN201841272U (en) * | 2010-11-05 | 2011-05-25 | 山东普利森集团有限公司 | Heavy-duty lathe spindle bearing nut pretightening structure |
| CN201988726U (en) * | 2011-03-28 | 2011-09-28 | 广州市昊志机电有限公司 | Bearing pre-tightening structure of high-speed electric main shaft |
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