CN202225001U - Adjustable screw rod bearing support device - Google Patents
Adjustable screw rod bearing support device Download PDFInfo
- Publication number
- CN202225001U CN202225001U CN2011203137309U CN201120313730U CN202225001U CN 202225001 U CN202225001 U CN 202225001U CN 2011203137309 U CN2011203137309 U CN 2011203137309U CN 201120313730 U CN201120313730 U CN 201120313730U CN 202225001 U CN202225001 U CN 202225001U
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- CN
- China
- Prior art keywords
- screw rod
- bearing
- screw mandrel
- bearings
- bearing support
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model aims to provide an adjustable screw rod bearing support device which can adjust the axial pre-tightening force of a screw rod, eliminate the axial thermal expansion of the screw rod and ensure the transmission accuracy of the screw rod. The adjustable screw rod bearing support device comprises a screw rod and two bearings arranged at the two ends of the screw rod respectively, wherein the two bearings are mounted in a back-to-back manner, the bearings and the screw rod are positioned through a support, and pre-tightening nuts are arranged on the bearings which are positioned at one end of the screw rod. By adopting the technical scheme, the utility model has the following advantages and benefits: the pre-tightening nuts are arranged on one side of the screw rod to set different pre-tightening forces during the use according to the specification and performance parameters of the screw rod, so as to eliminate the working clearance resulting from axial thermal expansion of the screw rod which is heated during the movement process, ensure the transmission accuracy and improve the process precision of the whole machine tool. The bearings are mounted in a back-to-back manner, so that the bearings can not be chucked due to axial thermal expansion of the screw rod, which keeps the axial/radial loads of the screw rod balanced and stable.
Description
Technical field
The utility model relates to a kind of adjustable screw mandrel bearing support assembly, and it belongs to the Digit Control Machine Tool part field.
Background technology
In Digit Control Machine Tool, the transmission accuracy of screw mandrel is the core of feed motion, and the height of its transmission accuracy plays deciding factor to the crudy of product.The screw mandrel bearing support assembly is the critical piece of screw body combination, and the transmission accuracy of screw mandrel is played a decisive role.Yet existing screw mandrel bearing support assembly does not have pretension, the generation axial thermal expansion that in the screw mandrel motion process, is heated, and working gap increases, and can not guarantee the screw mandrel axial force, and transmission accuracy is low, influences machine finish.To this; Some settling modes are also arranged in the prior art, just disclose a kind of solution, this screw axis bearing apparatus in the utility model patent " a kind of screw axis bearing apparatus " of " 200920115507.6 " like application number; Comprise fore bearing case, after the bearing box and depression bar; Be provided with a pair of angular contact ball bearing in the described fore bearing case, be provided with ball bearing in the described after the bearing box, angular contact ball bearing and ball bearing and screw mandrel are complementary.This utility model keeps axial force owing to adopted angular contact ball bearing in groups when guaranteeing transmission accuracy; Owing to adopted ball bearing, absorbed thermal deformation, further guaranteed precision.But such complex structure, bearing is many, and cost is high, can't solve the problem that receives thermogenetic working gap in the screw mandrel motion process.
The utility model content
The utility model technical problem to be solved provides a kind of adjustable screw mandrel axial pre tightening force, offsets the screw mandrel axial thermal expansion, keeps the adjustable screw mandrel bearing support assembly of screw mandrel transmission accuracy.
For solving the problems of the technologies described above, a kind of adjustable screw mandrel bearing support assembly of the utility model comprises screw mandrel; The screw mandrel two ends respectively are provided with a bearing; Two back-to-back installations of bearing, said bearing and screw mandrel are through bearing location, on the bearing of an end of screw mandrel, are rotary with pre-load nut.
Preferably; Said bearing comprises that said bearing comprises inner ring, outer ring and retainer; Between said inner ring and the outer ring guide groove is arranged, rolling element is housed in the guide groove, said bearing contact angle is 60 ° of angles; Such structure make bearing have simultaneously bigger axially with holding capacity radially, can offset and receive thermogenetic axial thermal expansion in the screw mandrel motion process and can not be stuck.
Preferably, said bearing accuracy is the P4 level.High accuracy can reduce the screw mandrel wearing and tearing, improves the screw mandrel transmission accuracy.
The utility model is owing to adopted technique scheme; Have the following advantages and effect: owing to pre-load nut is set in a side of screw mandrel; Can in operating position different pretightning forces be set according to screw mandrel model, performance parameter, offset the working gap that receives thermogenetic axial thermal expansion in the screw mandrel motion process and produce; Guarantee transmission accuracy, improve lathe complete machine machining accuracy; The back-to-back installation of bearing, the axial thermal expansion rear bearing of screw mandrel can not be stuck, and keeps screw mandrel axial load and radial load balance and stability.Apparatus structure is simple, and cost is low.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is a kind of adjustable screw mandrel bearing support assembly sketch map of the utility model.
The specific embodiment
A kind of adjustable screw mandrel bearing support assembly as shown in Figure 1 comprises screw mandrel 4, and screw mandrel 4 two ends respectively are provided with the 2 back-to-back installations of 2, two bearings of a bearing, and said bearing 2 and screw mandrel 4 be through bearing 3 location, on the bearing 2 of an end of screw mandrel 4, is rotary with pre-load nut 1.Said bearing 2 comprises that said bearing 2 comprises inner ring, outer ring and retainer, and guide groove 5 is arranged between said inner ring and the outer ring, and rolling element 6 is housed in the guide groove 5, and rolling element 6 can be a ball, also can be roller.Said bearing 2 contact angles are 60 ° of angles, and for guaranteeing technology acuracy, said bearing 2 precision are the P4 level.
Before work, to rotate pre-load nut 1 earlier, a pretightning force is set, so just can offset and receive thermogenetic axial thermal expansion and working gap in the screw mandrel motion process, guarantee transmission accuracy.After operating temperature raise, screw mandrel 4 was heated and produces the axial thermal expansion elongation, because the structure of two bearing 2 back-to-back installations; And pretightning force arranged; Part or all of pretightning force has been offset in the thermal expansion of screw mandrel 4 elongation, but the play of bearing 2 is with preparatory interference slightly or is 0, has guaranteed the transmission accuracy of screw mandrel 4.Bearing 2 contact angle α are 60 ° of angles, keep screw mandrel 4 axial loads and radial load balance and stability, reach high accuracy transmission effect.
Claims (3)
1. adjustable screw mandrel bearing support assembly: it is characterized in that: comprise screw mandrel (4); Screw mandrel (4) two ends respectively are provided with a bearing (2); The back-to-back installation of two bearings (2); Said bearing (2) and screw mandrel (4) be through bearing (3) location, on the bearing (2) of an end of screw mandrel (4), is rotary with pre-load nut (1).
2. a kind of adjustable screw mandrel bearing support assembly as claimed in claim 1: it is characterized in that: said bearing (2) comprises inner ring, outer ring and retainer; Guide groove (5) is arranged between said inner ring and the outer ring; Rolling element (6) is housed in the guide groove (5), and said bearing (2) contact angle is 60 ° of angles.
3. like the wherein arbitrary described a kind of adjustable screw mandrel bearing support assembly of claim 1-2: it is characterized in that: said bearing (2) precision is the P4 level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203137309U CN202225001U (en) | 2011-08-24 | 2011-08-24 | Adjustable screw rod bearing support device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203137309U CN202225001U (en) | 2011-08-24 | 2011-08-24 | Adjustable screw rod bearing support device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202225001U true CN202225001U (en) | 2012-05-23 |
Family
ID=46075607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203137309U Expired - Fee Related CN202225001U (en) | 2011-08-24 | 2011-08-24 | Adjustable screw rod bearing support device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202225001U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104526435A (en) * | 2014-12-18 | 2015-04-22 | 济南二机床集团有限公司 | Ball screw end support bearing arranging structure of high-speed feed shaft |
| CN104913006A (en) * | 2015-05-12 | 2015-09-16 | 江阴尚爵机械制造有限公司 | Novel high-precision slewing support |
| CN109855866A (en) * | 2017-11-29 | 2019-06-07 | 洛阳轴承研究所有限公司 | Mounted in pairs angular contact ball bearing axial rigidity measurement method |
-
2011
- 2011-08-24 CN CN2011203137309U patent/CN202225001U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104526435A (en) * | 2014-12-18 | 2015-04-22 | 济南二机床集团有限公司 | Ball screw end support bearing arranging structure of high-speed feed shaft |
| CN104913006A (en) * | 2015-05-12 | 2015-09-16 | 江阴尚爵机械制造有限公司 | Novel high-precision slewing support |
| CN109855866A (en) * | 2017-11-29 | 2019-06-07 | 洛阳轴承研究所有限公司 | Mounted in pairs angular contact ball bearing axial rigidity measurement method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20130824 |