CN102889350B - High-speed heavy-load ball screw assembly - Google Patents
High-speed heavy-load ball screw assembly Download PDFInfo
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- CN102889350B CN102889350B CN201210353501.9A CN201210353501A CN102889350B CN 102889350 B CN102889350 B CN 102889350B CN 201210353501 A CN201210353501 A CN 201210353501A CN 102889350 B CN102889350 B CN 102889350B
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- steel ball
- ball screw
- radius
- face
- ball
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Abstract
The invention discloses a high-speed heavy-load ball screw assembly, which comprises a lead screw shaft, a nut and at least two circulating devices, wherein a ball spiral groove is formed between an outer surface of the lead screw shaft and an inner surface of the nut; a plurality of steel balls are arranged in the ball spiral groove; and a spacer ring is arranged between adjacent two steel balls. The high-speed heavy-load ball screw assembly is characterized in that the circulating devices are sequentially distributed along an axis of the lead screw shaft and are respectively inserted on two symmetrical sides of the nut; and glands are sleeved outside the circulating devices and are fixedly connected with the nut. The high-speed heavy-load ball screw assembly has the advantages that the cyclic curve of the steel balls inside the circulating devices is optimized, and the velocity jump points of the steel balls in the circulating devices in the moving process are eliminated, so that the steel balls move smoothly, the limiting speed of the steel balls when the steel balls revolute around the axis of the lead screw shaft is improved, and a DN value of the ball screw assembly is increased further; and therefore, the ball screw assembly can be applied to the high-speed heavy-load field.
Description
Technical field
The present invention relates to a kind of ball screw pair, particularly relate to a kind of high speed heavy-load ball screw.
Background technique
For making the production of plastic product reach highi degree of accuracy, high efficiency under world today's situation, injection machine is an inexorable trend to motorized development, and full electric injection molding machine is than hydraulic type injection moulding machine environmental protection more, energy-conservation in the past.Along with the development of this motorized, its component also must can keep high reliability under bad working environments, and the Performance And Reliability therefore as the ball screw pair of full electric injection molding machine Mechanical Driven Partial key component just seems particularly important.
At present, domestic conventional ball lead screw pair is all be applied in high speed light loading or low-speed heave-load field, and in order to meet injection machine injection moulding and matched moulds part large load, fast moving requirement, its DN value to ball screw pair requires general 14 ~ more than 160,000, and DN value depends on the whether submissive of ball-recirculation curve to a great extent.Therefore, the ball screw pair of design research and development high-speed overload is imperative.
Summary of the invention
Technical problem to be solved by this invention is to provide one can increase DN value, makes it be applicable to the high speed heavy-load ball screw in high-speed overload field.
The present invention solves the problems of the technologies described above adopted technological scheme: a kind of high speed heavy-load ball screw, comprise lead screw shaft, nut and at least two circulation meanss, ball screw groove is provided with between the outer surface of described lead screw shaft and the internal surface of described nut, multiple steel ball is furnished with in described ball screw groove, cage ring is furnished with between two adjacent steel balls, described circulation means distributes successively along the axis of described lead screw shaft and is plugged on both sides symmetrical on described nut respectively, described circulation means overcoat has gland, described gland is fixedly connected with described nut.
Described circulation means comprises loop-body, the two ends of described loop-body are fixedly installed the pin of the central point along loop-body respectively, described pin comprises tongue oral area and the portion that blocks, the length in the described portion that blocks is greater than the length of described tongue oral area, the described portion of blocking is positioned at the outside of described tongue oral area, described tongue oral area is provided with semicircular tongue mouth goal chamber, inlet's radius in described tongue mouth goal chamber is less than the radius of steel ball in ball screw pair, the described portion of blocking is provided with semicircular goal chamber of blocking, the radius in described goal chamber of blocking is greater than the radius of steel ball in ball screw pair, described tongue mouth goal chamber and described goal chamber of blocking form a steel ball goal chamber jointly.
Inlet's radius in described tongue mouth goal chamber is 0.9 ~ 0.95 times of steel ball radius in described ball screw pair, in same cross section, the described inlet center in tongue mouth goal chamber and the throw of eccentric of the centre of sphere of steel ball are 0.9 ~ 1.2mm, and the radius in described goal chamber of blocking is 1.05 ~ 1.15 times of steel ball radius in described ball screw pair.
Steel ball passage is provided with in described loop-body, the steel ball goal chamber at described steel ball passage and two ends forms the circulation canal of steel ball jointly, the cross section of described circulation canal is circle and cross sectional radius is equal with the radius in described goal chamber of blocking, the center line of described circulation canal is the movement locus of the steel ball centre of sphere, be the cyclic curve of steel ball, described cyclic curve is along the central point of described loop-body, described cyclic curve from steel ball goal chamber to central point successively by helix extension, BridgeCurve section, fillet section and straightway composition, described helix extension is by relation
determine,
Wherein: (x, y, z) represents the coordinate that cyclic curve is put, L represents the helical pitch of ball screw pair, d
0represent the nominal diameter of screw mandrel in ball screw pair;
Described BridgeCurve section is by the projection relation formula in XOZ face
with the projection relation formula in XOY face
jointly determine, wherein:
represent the projection center of circle of BridgeCurve section in XOZ face, R
1represent the radius of the projection of BridgeCurve section in XOZ face;
Described fillet section is by the projection relation formula in X ' OZ face
with the projection relation formula in XOY face
,
jointly determine, wherein: X ' OZ face is obtained after Z axis rotation alpha ° by XOZ face, and α represents the angle that XOZ face rotates around Z axis,
represent the projection center of circle of fillet section in X ' OZ face,
represent the point in the projection in X ' OZ face, R
2represent the radius of the projection of fillet section in X ' OZ face,
represent the starting point of the fillet section projection in XOY face, n represents the circulation number of turns after rounding up;
Described straightway is by the projection relation formula z=constant A in XOZ face and the projection relation formula in XOY face
jointly determine, wherein constant A is determined by the maximum installation external diameter of the nut on ball screw pair.
The material of described loop-body and described pin is synthetic resin.
The outer surface in the joint of described loop-body and described pin, the outer surface of described tongue oral area, the described portion that blocks is respectively arranged with depression, can prevent this circulation means from injection moulding process, producing distortion, make its uniform wall thickness.
Compared with prior art, advantage of the present invention is because the axis of circulation means along lead screw shaft distributes successively and be plugged on both sides symmetrical on nut respectively, the thrust load of nut interior is circumferentially being uniformly distributed, improve the bearing capacity of whole ball screw pair, also extend working life simultaneously; Again due in circulation means because inlet's radius in tongue mouth goal chamber is less than the radius of steel ball in ball screw pair, the radius in goal chamber of blocking is greater than the radius of steel ball in ball screw pair, be conducive to scooping up and turning to of steel ball in cyclic process, ensure that steel ball is stable along circulation curvilinear motion when tongue mouth place is scooped up, decrease the double swerve in steel ball circulation steering procedure, improve the revolution speed of steel ball wire winding rod axis, thus improve the DN value of ball screw pair entirety; And cyclic curve is made up of helix extension, BridgeCurve section, fillet section and straightway successively, steel ball is optimized at the cyclic curve of this circulation means inside, eliminate the velocity jump point of steel ball in circulation means in movement process, steel ball is moved more smooth, improve the velocity limit of steel ball wrapping wire thick stick axis revolution, further increase the DN value of ball screw pair, make ball screw pair be applicable to high-speed overload field.
Accompanying drawing explanation
Fig. 1 is front view of the present invention;
Fig. 2 is partial sectional view of the present invention;
Fig. 3 be steel ball of the present invention with circulation means coordinate schematic diagram;
Fig. 4 is the front view of circulation means of the present invention;
Fig. 5 is the cross sectional representation of loop-body of the present invention;
Fig. 6 is the perspective view of circulation means of the present invention;
Fig. 7 is the schematic diagram in steel ball goal chamber in circulation means of the present invention;
To be steel ball goal chamber of the present invention illustrate enlarged view with coordinating of steel ball to Fig. 8;
Fig. 9 is the perspective view of cyclic curve of the present invention in XOZ face;
Figure 10 is the perspective view of cyclic curve of the present invention in XOY face.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
As shown in the figure, a kind of high speed heavy-load ball screw, comprise lead screw shaft 4, nut 5 and four circulation meanss, ball screw groove 41 is provided with between the outer surface of lead screw shaft 4 and the internal surface of nut 5, multiple steel ball 6 is furnished with in ball screw groove 41, cage ring 7 is furnished with between two adjacent steel balls 6, circulation means distributes successively along the axis of lead screw shaft 4 and is plugged on both sides symmetrical on nut 5 respectively, circulation means overcoat has gland 8, gland 8 is fixedly connected on nut 5 by screw, circulation means comprises loop-body 1, the two ends of loop-body 1 are wholely set the pin 2 along the central point of loop-body 1 respectively, pin 2 comprises tongue oral area 21 and the portion 22 that blocks, the length in portion 22 of blocking is greater than the length of tongue oral area 21, the portion 22 that blocks is positioned at the outside of tongue oral area 21, the joint of loop-body 1 and pin 2, the outer surface of tongue oral area 21, the outer surface in portion 22 of blocking is respectively arranged with depression 3, tongue oral area 21 is provided with semicircular tongue mouth goal chamber 211, inlet's radius R in tongue mouth goal chamber 211
tonguefor steel ball radius R in ball screw pair
ball0.92 times, and in same cross section, the inlet center in tongue mouth goal chamber 211 and the eccentric distance e of the steel ball centre of sphere are 1.1mm, and the portion 22 that blocks is provided with semicircular goal chamber 221 of blocking, the radius R in goal chamber 221 of blocking
gearfor steel ball radius R in ball screw pair
ball1.1 times, tongue mouth goal chamber 211 and a composition steel ball goal chamber jointly, goal chamber 221 of blocking, steel ball passage 11 is provided with in loop-body 1, the steel ball goal chamber at steel ball passage 11 and two ends forms the circulation canal of steel ball 6 jointly, and the cross section of circulation canal is circle and the radius R in cross sectional radius and goal chamber 221 of blocking
gearequal, the center line of circulation canal is the movement locus of the steel ball centre of sphere, be the cyclic curve of steel ball 6, cyclic curve is along the central point of loop-body 1, cyclic curve is made up of helix extension S1, BridgeCurve section S2, fillet section S3 and straightway S4 from steel ball goal chamber successively to central point, and helix extension S1 is by relation
determine,
Wherein: (x, y, z) represents the coordinate that cyclic curve is put, L represents the helical pitch of ball screw pair, d
0represent the nominal diameter of screw mandrel in ball screw pair;
BridgeCurve section S2 is by the projection relation formula in XOZ face
with the projection relation formula in XOY face
jointly determine, wherein:
represent the projection center of circle of BridgeCurve section in XOZ face, R
1represent the radius of the projection of BridgeCurve section in XOZ face;
Fillet section S3 is by the projection relation formula in X ' OZ face
with the projection relation formula in XOY face
,
jointly determine, wherein: X ' OZ face is obtained after Z axis rotation alpha ° by XOZ face, and α represents the angle that XOZ face rotates around Z axis,
represent the projection center of circle of fillet section in X ' OZ face,
represent the point in the projection in X ' OZ face, R
2represent the radius of the projection of fillet section in X ' OZ face,
represent the starting point of the fillet section projection in XOY face, n represents the circulation number of turns after rounding up (the such as circulation number of turns is 3.5 circles, then n gets 4);
Straightway S4 is by the projection relation formula z=constant A in XOZ face and the projection relation formula in XOY face
jointly determine, wherein constant A is determined by the maximum installation external diameter of the nut on ball screw pair.
In above-described embodiment, the quantity of circulation means can require to select according to the actual load of ball wire bar pair, but is at least two, and the material of loop-body 1 and pin 2 is synthetic resin, the radius R in tongue mouth goal chamber 211
tonguecan steel ball radius R in ball screw pair according to actual needs
ballthe scope of 0.9 ~ 0.95 times in select, in same cross section, the center in tongue mouth goal chamber 211 and the eccentric distance e of the steel ball centre of sphere can be selected in the scope of 0.9 ~ 1.2mm, the radius R in goal chamber 221 of blocking
gearcan steel ball radius R in ball screw pair according to actual needs
ballthe scope of 1.05 ~ 1.15 times in select.
Claims (3)
1. a high speed heavy-load ball screw, comprise lead screw shaft, nut and at least two circulation meanss, ball screw groove is provided with between the outer surface of described lead screw shaft and the internal surface of described nut, multiple steel ball is furnished with in described ball screw groove, cage ring is furnished with between two adjacent steel balls, described circulation means distributes successively along the axis of described lead screw shaft and is plugged on both sides symmetrical on described nut respectively, described circulation means overcoat has gland, described gland is fixedly connected with described nut, described circulation means comprises loop-body, the two ends of described loop-body are fixedly installed the pin of the central point along loop-body respectively, described pin comprises tongue oral area and the portion that blocks, the length in the described portion that blocks is greater than the length of described tongue oral area, the described portion of blocking is positioned at the outside of described tongue oral area, described tongue oral area is provided with semicircular tongue mouth goal chamber, inlet's radius in described tongue mouth goal chamber is less than the radius of steel ball in ball screw pair, the described portion of blocking is provided with semicircular goal chamber of blocking, the radius in described goal chamber of blocking is greater than the radius of steel ball in ball screw pair, described tongue mouth goal chamber and described goal chamber of blocking form a steel ball goal chamber jointly, the joint of described loop-body and described pin, the outer surface of described tongue oral area, the outer surface in the described portion that blocks is respectively arranged with depression, it is characterized in that being provided with steel ball passage in described loop-body, the steel ball goal chamber at described steel ball passage and two ends forms the circulation canal of steel ball jointly, the cross section of described circulation canal is circle and cross sectional radius is equal with the radius in described goal chamber of blocking, the center line of described circulation canal is the movement locus of the steel ball centre of sphere, be the cyclic curve of steel ball, described cyclic curve is along the central point of described loop-body, described cyclic curve from steel ball goal chamber to central point successively by helix extension, BridgeCurve section, fillet section and straightway composition, described helix extension is by relation
Determine,
Wherein: (x, y, z) represents the coordinate that cyclic curve is put, L represents the helical pitch of ball screw pair, d
0represent the nominal diameter of screw mandrel in ball screw pair;
Described BridgeCurve section is by the projection relation formula (x-x in XOZ face
0)
2+ (z-z
0)
2=R
1 2with the projection relation formula in XOY face
jointly determine, wherein: (x
0, z
0) represent the projection center of circle of BridgeCurve section in XOZ face, R
1represent the radius of the projection of BridgeCurve section in XOZ face;
Described fillet section is by the projection relation formula (x'-x' in X ' OZ face
1)
2+ (z-z
1)
2=R
2 2with the projection relation formula y=ctg α x in XOY face,
jointly determine, wherein: X ' OZ face is obtained after Z axis rotation alpha ° by XOZ face, and α represents the angle that XOZ face rotates around Z axis, (x'
1, z
1) represent the projection center of circle of fillet section in X ' OZ face, (x', z) represents the point in the projection in X ' OZ face, R
2represent the radius of the projection of fillet section in X ' OZ face, (x
2, y
2) representing the starting point that the fillet section in XOY face projects, n represents the circulation number of turns after rounding up;
Described straightway is determined jointly by the projection relation formula z=constant A in XOZ face and the projection relation formula y=ctg α x in XOY face, and wherein constant A is determined by the maximum installation external diameter of the nut on ball screw pair.
2. a kind of high speed heavy-load ball screw as claimed in claim 1, it is characterized in that inlet's radius in described tongue mouth goal chamber is 0.9 ~ 0.95 times of steel ball radius in described ball screw pair, in same cross section, the described inlet center in tongue mouth goal chamber and the throw of eccentric of the centre of sphere of steel ball are 0.9 ~ 1.2mm, and the radius in described goal chamber of blocking is 1.05 ~ 1.15 times of steel ball radius in described ball screw pair.
3. a kind of high speed heavy-load ball screw as claimed in claim 1, is characterized in that the material of described loop-body and described pin is synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210353501.9A CN102889350B (en) | 2012-09-21 | 2012-09-21 | High-speed heavy-load ball screw assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210353501.9A CN102889350B (en) | 2012-09-21 | 2012-09-21 | High-speed heavy-load ball screw assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102889350A CN102889350A (en) | 2013-01-23 |
| CN102889350B true CN102889350B (en) | 2015-07-08 |
Family
ID=47532969
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210353501.9A Expired - Fee Related CN102889350B (en) | 2012-09-21 | 2012-09-21 | High-speed heavy-load ball screw assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102889350B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2911330Y (en) * | 2006-03-24 | 2007-06-13 | 南京工艺装备制造有限公司 | Block inserting roller lead-screw pair |
| CN202032055U (en) * | 2011-03-31 | 2011-11-09 | 上银科技股份有限公司 | External-circulation ball screw |
| CN202914657U (en) * | 2012-09-21 | 2013-05-01 | 宁波海迈克精密机械制造有限公司 | High-speed and heavy-load ball screw assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6854351B2 (en) * | 2001-11-14 | 2005-02-15 | Nsk Ltd. | Linear motion device, rolling device and separator for rolling device |
-
2012
- 2012-09-21 CN CN201210353501.9A patent/CN102889350B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2911330Y (en) * | 2006-03-24 | 2007-06-13 | 南京工艺装备制造有限公司 | Block inserting roller lead-screw pair |
| CN202032055U (en) * | 2011-03-31 | 2011-11-09 | 上银科技股份有限公司 | External-circulation ball screw |
| CN202914657U (en) * | 2012-09-21 | 2013-05-01 | 宁波海迈克精密机械制造有限公司 | High-speed and heavy-load ball screw assembly |
Non-Patent Citations (1)
| Title |
|---|
| 沈守范.《滚珠丝杠付返珠器正螺旋面型回珠曲线的计算》.《南京理工大学学报(自然科学版)》.1979,(第1期),第103-114页. * |
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|---|---|
| CN102889350A (en) | 2013-01-23 |
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