CN203197647U - Ball screw prestretching structure - Google Patents
Ball screw prestretching structure Download PDFInfo
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- CN203197647U CN203197647U CN 201320092506 CN201320092506U CN203197647U CN 203197647 U CN203197647 U CN 203197647U CN 201320092506 CN201320092506 CN 201320092506 CN 201320092506 U CN201320092506 U CN 201320092506U CN 203197647 U CN203197647 U CN 203197647U
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Abstract
The utility model relates to a ball screw prestretching structure. The ball screw prestretching structure is characterized in that a bearing pedestal, a screw rod, an angular contact ball bearing set, a bearing gland, a spring, a space ring and an adjusting screw nut are included, a stepped through hole is formed in the bearing pedestal, the angular contact ball bearing set is composed of a pair of angular contact ball bearings, the angular contact ball bearings are mounted inside the large-diameter hole of the stepped through hole, a shaft shoulder is arranged at the end of the screw rod, a threaded part is arranged at the end of the shaft shoulder, the shaft shoulder of the screw rod is arranged on the bearing pedestal in a bearing mode by the angular contact ball bearing set, the threaded part of the shaft shoulder of the screw rod extends out of the outer side of the bearing pedestal and is in threaded connection with the adjusting screw nut, and the spring is arranged between the adjusting screw nut and the inner ring of the angular contact ball bearing set. The acting force of the spring is set by the way that the position of the adjusting screw nut is adjusted, and therefore the value of the axial pretightening force of the bearings and the value of the prestretching force of the screw rod can be kept stable and balanced relatively under different working conditions.
Description
Technical field
The utility model relates to a kind of ball screw prestretched structure, particularly a kind of ball screw prestretched structure.
Background technology
The mechanical organ that ball wire bar pair is comprised of parts such as screw mandrel, nut, balls, its effect is to become rectilinear motion with rotatablely moving.It is high that ball wire bar pair has transmission efficiency, wear and tear little, and moving equilibrium, without creeping phenomenon, the transmission accuracy advantages of higher.It is the further infiltration and development of traditional sliding screw, and its good frictional behavior of ball screw synetion makes it be widely used in various industrial equipments, precision instrument.Especially in recent years, ball wire bar pair uses extensively in machine industry as Digit Control Machine Tool linear drives performance element, has greatly promoted the development of Digit Control Machine Tool.The feed system of Digit Control Machine Tool will obtain high transmission accuracy, and except the rigidity of ball wire bar pair itself, correct installation and the supporting construction of ball screw also can not be ignored.Ball wire bar pair is as one of Digit Control Machine Tool key feature, and its installation form quality has determined kinematic accuracy and the machining accuracy of lathe to a great extent.In existing lathe, the mounting means of ball screw generally has 3 kinds: (1) one end is fixed, and an end freely; (2) one ends are fixed, and an end moves about; (3) two ends are fixed.Mode (1) is applicable to low speed revolution, the shorter situation (at right angle setting) of screw mandrel; Mode (2) is applicable to middling speed revolution, high-precision situation; Mode (3) is applicable to high speed rotary, high-precision situation.The high speed that this paper develops take my company, the two ends fixed form that high-precision numerical control machine was adopted are the improvement of example elaboration to its general mounting means.
Although the mounting means complex process that two ends are fixing is used in the heart in current high-grade Precision Machining more.In the Theoretical Design of lathe, the prestretching force of screw mandrel, the pretightning force of bearing are easily calculated and employing, but in production practices, many-sided factor affecting is arranged to assembly precision and the requirement of screw pair, bearing.Such as the accuracy of manufacture of screw pair itself, feed screw nut's pretension degree, bearing block basic material rigidity, comprehensive assembly precision etc.The control of screw mandrel prestretching force is based upon on the theoretical foundation often, the theoretical value of the Relative Fuzzy that provides by calculating (particularly middle-size and small-size Digit Control Machine Tool manufacturing enterprise).
Because screw mandrel, bearing etc. belong to outsourcing piece, its self-stiffness can't change, so will solve the prestretching force of screw mandrel, the play that the pretightning force problem of bearing only has outer power to improve screw mandrel rigidity and bearing is eliminated.Because the pretightning force that the screw mandrel group applies is to implement by theoretical value, and there are micro-difference in processing and manufacturing and fit on, very difficult control causes.The size of the prestretching force of screw pair, bearing group, very large on the impact of lathe life-span, workmanship, except bearing, screw mandrel are accelerated to lose efficacy, also affect the normal operation of lathe.Cross conference such as its axial force of bearing and accelerate bearing wear, reduce the lathe life-span.Need heat engine after the lathe start, increase energy consumption, reduce the unfavorable factors such as lathe operating efficiency.In addition, vibration also can make the local pyrexias such as screw mandrel, bearing, accelerates the moving component wearing and tearing, destroys lathe original geometry precision, when its intrinsic frequency makes miscellaneous part produce resonance, will produce noise.This is contaminated environment not only, and diminishes health when serious.Greatly reduce Machine Tool design life-span and workmanship, cause lathe not reach designing requirement.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of axial pre tightening force of bearing and the prestretching force of screw mandrel can keep the relatively steadily ball screw prestretched structure of balance in different operating modes.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of ball screw prestretched structure, and its innovative point is: comprise bearing block, screw mandrel, angular contact ball bearing group, bearing gland, spring, spacer ring and adjusting nut; Begin a theatrical performance the scalariform through hole on the bearing block, through hole is made of the coaxial size diameter hole that overlaps of level, and large diameter hole is positioned at the bearing block outside, and small diameter bore is positioned at the bearing block inboard; The angular contact ball bearing group is comprised of the pair of horns contact ball bearing, angular contact ball bearing is installed in the large diameter hole of step-like through hole, the inner face of angular contact ball bearing group props up the step surface that step-like hole size diametric hole forms, and the outer face of angular contact ball bearing group is spacing fixing by the bearing gland that is connected with bearing block bolt; The end of screw mandrel arranges the shaft shoulder, shaft shoulder end arranges the threaded portion, the screw mandrel shaft shoulder is bearing on the bearing block by the angular contact ball bearing group, the projecting shaft bearing outside, shaft shoulder threaded portion of screw mandrel, the shaft shoulder threaded portion of the screw mandrel adjusting nut that is threaded arranges spring between the inner ring of adjusting nut and angular contact ball bearing group.
Further, described spring is comprised of some disk springs.
The utility model has the advantage of: come the size of setting spring active force by the position of adjusting adjusting nut, thereby the prestretching force that reaches the axial pre tightening force of bearing and screw mandrel in different operating modes, its value can keep relative steady balance.This structure lathe cold conditions, hot, servo load difference obviously dwindles, and bearing rotary is smooth and easy, gentle in voice, can realize again the purpose of prestretched after the screw mandrel temperature rise.The motion noise of its backlass, screw rod vibration, screw pair is clearly better, be consistent in any operating mode, the surface of the work machining accuracy is detailed takes on a new look, and has greatly shortened lathe preheating time and power consumption, has realized the ideas of energy-saving that can put into production after the lathe start.
Description of drawings
Fig. 1 is the utility model ball screw prestretched structural representation.
The specific embodiment
As shown in Figure 1, comprise bearing block 1, screw mandrel 2, angular contact ball bearing 3, bearing gland 4, disk spring 5, spacer ring 6 and adjusting nut 7.
Begin a theatrical performance the scalariform through hole on the bearing block 1, through hole is made of the coaxial size diameter hole that overlaps of level, and large diameter hole is positioned at bearing block 1 outside, and small diameter bore is positioned at bearing block 1 inboard.
The angular contact ball bearing group is comprised of pair of horns contact ball bearing 3, angular contact ball bearing 3 is installed in the large diameter hole of step-like through hole, the inner face of angular contact ball bearing group props up the step surface that step-like hole size diametric hole forms, and the outer face of angular contact ball bearing group is spacing fixing by the bearing gland 4 that is connected with bearing block bolt.
The end of screw mandrel 2 arranges the shaft shoulder, shaft shoulder end arranges the threaded portion, screw mandrel 2 shaft shoulders are bearing on the bearing block 1 by the angular contact ball bearing group, projecting shaft bearing 1 outside, shaft shoulder threaded portion of screw mandrel, the shaft shoulder threaded portion of the screw mandrel adjusting nut 7 that is threaded, between the inner ring of adjusting nut 7 and angular contact ball bearing group spring is set, spring is comprised of some disk springs 5.
Claims (2)
1. a ball screw prestretched structure is characterized in that: comprise bearing block, screw mandrel, angular contact ball bearing group, bearing gland, spring, spacer ring and adjusting nut; Begin a theatrical performance the scalariform through hole on the bearing block, through hole is made of the coaxial size diameter hole that overlaps of level, and large diameter hole is positioned at the bearing block outside, and small diameter bore is positioned at the bearing block inboard; The angular contact ball bearing group is comprised of the pair of horns contact ball bearing, angular contact ball bearing is installed in the large diameter hole of step-like through hole, the inner face of angular contact ball bearing group props up the step surface that step-like hole size diametric hole forms, and the outer face of angular contact ball bearing group is spacing fixing by the bearing gland that is connected with bearing block bolt; The end of screw mandrel arranges the shaft shoulder, shaft shoulder end arranges the threaded portion, the screw mandrel shaft shoulder is bearing on the bearing block by the angular contact ball bearing group, the projecting shaft bearing outside, shaft shoulder threaded portion of screw mandrel, the shaft shoulder threaded portion of the screw mandrel adjusting nut that is threaded arranges spring between the inner ring of adjusting nut and angular contact ball bearing group.
2. ball screw prestretched structure according to claim 1, it is characterized in that: described spring is comprised of some disk springs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092506 CN203197647U (en) | 2013-03-01 | 2013-03-01 | Ball screw prestretching structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092506 CN203197647U (en) | 2013-03-01 | 2013-03-01 | Ball screw prestretching structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203197647U true CN203197647U (en) | 2013-09-18 |
Family
ID=49141786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320092506 Expired - Fee Related CN203197647U (en) | 2013-03-01 | 2013-03-01 | Ball screw prestretching structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203197647U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143971A (en) * | 2013-03-01 | 2013-06-12 | 江苏松野数控科技有限公司 | Pre-drawing structure of ball screw |
| CN103639817A (en) * | 2013-11-19 | 2014-03-19 | 无锡京华重工装备制造有限公司 | Ball screw positioning structure |
| CN106425641A (en) * | 2016-09-26 | 2017-02-22 | 苏州德扬数控机械有限公司 | Lead screw prestretching structure of numerical control machine tool |
-
2013
- 2013-03-01 CN CN 201320092506 patent/CN203197647U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143971A (en) * | 2013-03-01 | 2013-06-12 | 江苏松野数控科技有限公司 | Pre-drawing structure of ball screw |
| CN103639817A (en) * | 2013-11-19 | 2014-03-19 | 无锡京华重工装备制造有限公司 | Ball screw positioning structure |
| CN106425641A (en) * | 2016-09-26 | 2017-02-22 | 苏州德扬数控机械有限公司 | Lead screw prestretching structure of numerical control machine tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20160301 |