CN107524772A - A kind of big stroke planetary roller screw pair - Google Patents
A kind of big stroke planetary roller screw pair Download PDFInfo
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- CN107524772A CN107524772A CN201710718785.XA CN201710718785A CN107524772A CN 107524772 A CN107524772 A CN 107524772A CN 201710718785 A CN201710718785 A CN 201710718785A CN 107524772 A CN107524772 A CN 107524772A
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- roller
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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
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2252—Planetary rollers between nut and screw
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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
- F16H2025/2059—Superposing movement by two screws, e.g. with opposite thread direction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The embodiments of the invention provide a kind of big stroke planetary roller screw pair, belong to precision drive technical field, the big stroke planetary roller screw pair includes nut, first planet roller assembly, second planetary roller component, first screw mandrel and the second screw mandrel, first screw mandrel is arranged on the first end of the nut by the first planet roller assembly, second screw mandrel is arranged on the second end of the nut by the second planetary roller component, when the nut rotation, first screw mandrel and second screw mandrel relatively or contrarily move, avoid causing running clearance problems of too because of key connection, overall structure rigidity is high, small volume, especially suitable for nut drive-type, the occasion of big stroke applications demand.
Description
Technical field
The invention belongs to precision drive technical field, more particularly, to a kind of shared big stroke planetary roller of nut differential type
Lead screw pair.
Background technology
Planetary roller screw pair is as a kind of accurate linear motion unit, with its unique structure and superior performance,
The fields such as high-grade, digitally controlled machine tools, precision instrument, industrial robot, high-end weaponry are widely applied to, compared to ball-screw
For pair, planetary roller screw pair uses screw-driven, and bearing medium is the roller of certain amount circumference, load contact point
More, so on the premise of identical leading screw diameter, bigger load can be born, effect of load balancing mechanism becomes apparent from.
By study at present most of planetary roller screws structure type, it can be found that mainly by a nut, one
Screw mandrel, two retainers and a number of roller composition, type of drive are divided into nut and rotated, and screw mandrel does straight line fortune
Move, or screw mandrel rotates, nut moves along a straight line.
In some particular applications, it is desirable to which lead screw pair can realize bigger flexible stroke, using the bigger silk of length
Thick stick or nut bring the rigidity decline of transmission parts, are difficult to meet that big stroke stretches demand according to existing structure composition form.
The content of the invention
The technical problem to be solved in the present invention is：A kind of big stroke planetary roller screw pair is provided, by differential by two kinds
The form that type planetary roller screw pair collection is integrated, it can realize that single nut drives two leading screws to do the work(to move along a straight line
Can, compared to traditional lead screw pair type, flexible stroke is increased, is especially suitable for the bigger field of range demands of being stretched to actuator,
Have broad application prospects.
The technical solution adopted in the present invention is：
A kind of big stroke planetary roller screw pair, including nut, the first planet roller assembly, the second planetary roller component,
First screw mandrel and the second screw mandrel, first screw mandrel are arranged on the first of the nut by the first planet roller assembly
End, second screw mandrel are arranged on the second end of the nut by the second planetary roller component, when the rotation nut
When, first screw mandrel and second screw mandrel are towards or away from motion.
In an alternative embodiment, first screw mandrel is hollow-core construction, when rotating the nut, second screw mandrel
In the cavity for inserting or passing first screw mandrel from one end of first screw mandrel.
In an alternative embodiment, the first planet roller assembly includes multiple first rollers and the first roller is kept
Frame；The diameter at the first roller both ends is less than main body portion diameter, and the main part is provided with first annular groove, described
The main part is divided into first paragraph and second segment by first annular groove, the first roller both ends and described first annular
The first external screw thread is equipped with groove, the first paragraph and/or second segment of the main part are provided with the second external screw thread；The nut
Three first annular projections are interval with the cavity of first end, the first annular projection is provided with the first internal thread；It is described
Multiple first rollers are arranged on the first end of the nut by first roller rolling retainer, first external screw thread with it is described
The adaptation engagement of first internal thread, the first paragraph and second segment of the main part are installed with two neighboring described first annular respectively
In cavity between projection, and there is gap with the cavity；The external screw thread of first screw mandrel is fitted with second external screw thread
With engagement.
In an alternative embodiment, the second planetary roller component includes multiple second rollers and the second roller is kept
Frame；The diameter at the second roller both ends is less than main body portion diameter, and the main part is provided with the second annular groove, described
The main part is divided into first paragraph and second segment, the second roller both ends and second annular by the second annular groove
The 3rd external screw thread is equipped with groove, the first paragraph and/or second segment of the main part are provided with the 4th external screw thread；The nut
Three the second annular protrusions are interval with the cavity at the second end, second annular protrusion is provided with the second internal thread；It is described
Multiple second rollers are arranged on the second end of the nut by second roller rolling retainer, the 3rd external screw thread with it is described
The adaptation engagement of second internal thread, the first paragraph and second segment of the main part are installed with two neighboring second annular respectively
In cavity between projection, and there is gap with the cavity；The external screw thread of second screw mandrel is fitted with the 4th external screw thread
With engagement.
In an alternative embodiment, the internal diameter of first screw mandrel is 0.7-0.8 times of external diameter.
In an alternative embodiment, the length of second screw mandrel is at least 1.5 times of second roller length.
In an alternative embodiment, the internal diameter of first screw mandrel is bigger 2-3mm than the external diameter of second screw mandrel.
In an alternative embodiment, the first annular ledge width is 0.1-0.3 times of first roller length, phase
The distance between adjacent two first annular projections are 1-2 times of the first annular raised width.
In an alternative embodiment, the raised width of the second ring is the 0.1- of second roller length
0.3 times, the distance between adjacent two second annular protrusion is 1-2 times of the second annular protrusion width.
The present invention compared with prior art the advantages of be：
(1) big stroke planetary roller screw pair provided in an embodiment of the present invention controls two leading screws simultaneously by same nut
Opposite or move toward one another, realizes same nut rotation, the linkage of two screw mandrels, respectively by preferred different lead parameters in series,
The helical pitch of non-standard series can be matched, possesses bigger flexible stroke and bearing capacity；
(2) two kinds of planetary roller screw pairs share same nut structure, compared to the arrangement of separate type, eliminate flower
The intermediate links such as key, flat key, threaded connection, overall structure rigidity is higher, and avoiding causes drive gap mistake because of external connection
The problem of big；
(3) using the internal diameter size of the hollow lead screw constraints bigger than the outside dimension of solid screw mandrel, two screw mandrels are formed
Coaxial nested layout, when shared nut does fixed-axis rotation, linear telescopic is moved and is independent of each other two screw mandrels simultaneously, so as to increase
The reciprocating stroke of new lead screw pair, is particularly suitable for nut drive-type, the occasion of big stroke applications demand；
(4) annular protrusion set using nut and the first roller, axial direction fortune of the limitation roller in planet rotation process
It is dynamic, so as to avoid the use of end gear so that screw thread engagement is relatively more free, reduces stuck, jam failure problems
Probability of happening, from processing technology angle, it is easier to it is ground internal thread, and processing blind hole ring gear relative difficult, greatly reduce
Difficulty of processing, save processing cost.
Brief description of the drawings
Fig. 1 is a kind of cross-sectional view of big stroke planetary roller screw pair provided in an embodiment of the present invention；
Fig. 2 is big stroke planetary roller screw pair first end perspective view provided in an embodiment of the present invention；
Fig. 3 is the cross-sectional view of nut provided in an embodiment of the present invention；
Fig. 4 is big stroke planetary roller screw pair first end perspective view provided in an embodiment of the present invention；
Fig. 5 is a kind of schematic appearance of big stroke planetary roller screw pair provided in an embodiment of the present invention.
Embodiment
Referring to Fig. 1-5, the embodiments of the invention provide a kind of big stroke planetary roller screw pair, including nut 1, the first row
Star roller assembly 8, the second planetary roller component 9, the first screw mandrel 2 and the second screw mandrel 3, the first screw mandrel 2 pass through the first planetary roller
Component 8 is arranged on the first end of nut 1, and the second screw mandrel 3 is arranged on the second end of nut 1 by the second planetary roller component 9, when
When nut 1 rotates, the first screw mandrel 2 and the second screw mandrel 3 are towards or away from motion.
Big stroke planetary roller screw pair provided in an embodiment of the present invention controls two leading screw phases simultaneously by same nut
The back of the body or move toward one another, realize same nut rotation, the linkage of two screw mandrels, can respectively by preferred different lead parameters in series
To match the helical pitch of non-standard series, possess bigger flexible stroke and bearing capacity；Two kinds of planetary roller screw pairs share same
One nut structure, compared to the arrangement of separate type, the intermediate links such as spline, flat key, threaded connection are eliminated, overall structure is firm
Property is higher, avoids the problem of causing drive gap excessive because of external connection；
In an alternative embodiment, the first screw mandrel 2 is hollow-core construction, first screw mandrel 2 and the second screw mandrel when rotating nut 1
3 relative motions, the second screw mandrel 3 is out of, the first screw mandrel 2 is inserted or passed in one end of the first screw mandrel 2 cavity.Said structure avoids
The movement interference of two kinds of screw mandrels, reduces axial dimension space, structural rigidity is higher；Utilize the internal diameter size ratio of hollow lead screw
The big constraints of the outside dimension of solid screw mandrel, the coaxial nested layout of two screw mandrels is formed, when shared nut does fixed-axis rotation
When, the linear telescopic motion simultaneously of two screw mandrels is independent of each other, and so as to increase the reciprocating stroke of new lead screw pair, is particularly suitable for nut
The occasion of drive-type, big stroke applications demand.
Referring to Fig. 2, the first planet roller assembly 8 includes multiple first rollers 4 and two the first roller rolling retainers 6；Such as Fig. 1
Shown, the diameter at the both ends of the first roller 4 is less than main body portion diameter, and main part is provided with first annular groove, first annular
The main part is divided into first paragraph and second segment by groove, and is equipped with the both ends of the first roller 4 and first annular groove
One external screw thread, the first paragraph and/or second segment of main part are provided with the second external screw thread, as shown in figure 1, in an optional reality of the invention
Apply in example, the main part of the first roller 4 is divided into two sections, i.e. first paragraph and second segment by first annular groove, and this first
Section and second segment are equipped with the second external screw thread, and the structure makes the stress equalization of the first roller 4, is advantageous to the normal work of the first roller 4
Make；In other embodiments, can also be according to using need to set first annular groove in the position of main part, can also root
The second external screw thread is only set on the first paragraph or second segment of main part according to needs, the present invention does not limit；Referring to Fig. 3, spiral shell
Three first annular raised a are interval with the cavity of female 1 first end, first annular raised a is provided with the first internal thread, adjacent
Screw thread is not provided with cavity wall between two first annular raised a；Referring to Fig. 2, multiple first rollers 4 pass through two the first rollers
Retainer 6 is arranged on the first end of nut 1 and the first screw mandrel 2 combines and forms the first differential type planetary roller screw pair, specifically,
The first internal thread one on the first external screw thread and three first annular raised a in the both ends of first roller 4 and first annular groove
One corresponding and adaptation engagement, the first paragraph of the main part of the first roller 4 be installed with two first annular raised a close to port it
Between cavity in, second segment be installed with away from port two first annular raised a between cavity in, and with the cavity
With gap；The external screw thread of first screw mandrel 2 engages with the second external screw thread adaptation of the first roller 4.
First differential type planetary roller screw pair operation principle is：When nut 1 does fixed-axis rotation by a certain direction of rotation,
First internal thread of nut 1 and the external screw thread engaged transmission of the first roller 4 first, the first roller 4 is forced to do rotation movement and around
One screw mandrel 2 does planetary motion, and the first roller rolling retainer 6 of both sides constrains the circumference relative position and concomitant rotation of the first roller 4,
The first roller 4 and first can be constrained again because the external screw thread of the first screw mandrel 2 engages with the second external screw thread of the first roller 4
The axial displacement caused by because of screw-driven of bar 2, so as to drive the first screw mandrel 2 to be moved along a straight line, realizes the first differential type row
Star roller screw pair moves to the conversion of linear motion from System of Rotating about Fixed Axis.The annular protrusion set using nut and the first roller,
Axial movement of the roller in planet rotation process is limited, so as to avoid the use of end gear so that screw thread engagement is relative
It is more free, reduce stuck, jam failure problems probability of happening；From processing technology angle, it is easier to be ground internal thread, and add
Work blind hole ring gear relative difficult, greatly reduces difficulty of processing, saves processing cost.
Referring to Fig. 4, the second planetary roller component 9 includes multiple second rollers 5 and two the second roller rolling retainers 7；Such as Fig. 1
Shown, the diameter at the both ends of the second roller 5 is less than main body portion diameter, and main part is provided with the second annular groove, the second annular
The main part of second roller 5 is divided into first paragraph and second segment by groove, in the both ends of the second roller 5 and the second annular groove
Provided with the 3rd external screw thread, the first paragraph and/or second segment of the main part of the second roller 5 are provided with the 4th external screw thread, as shown in figure 1,
In an alternate embodiment of the present invention, the main part of the second roller 5 is divided into two sections, i.e. first paragraph by the second annular groove
And second segment, this first paragraph and second segment are equipped with the 4th external screw thread, the structure makes the stress equalization of the second roller 5, is advantageous to
The normal work of two rollers 5；In other embodiments, it can also need to set the second annular groove according to use in the second roller
The position of 5 main parts, the 4th can also be set only on the first paragraph or second segment of the main part of the second roller 5 as needed
External screw thread, the present invention do not limit；Referring to Fig. 3, three the second annular protrusion b are interval with the cavity at the end of nut 1 second, the
Second ring projection b is provided with the second internal thread, and screw thread is not provided with the cavity wall between two neighboring second annular protrusion b；Referring to
Fig. 4, multiple second rollers 5 are arranged on the second end of nut 1 by two the second roller rolling retainers 7, with the solid difference of the second screw mandrel
The 3rd external screw thread and three the second annular protrusions in the both ends of the second roller of dynamic formula planetary roller screw pair 5 and the second annular groove
The second internal thread on b corresponds and adaptation engagement, the first paragraph of the main part of the second roller 5 are installed with close to the two of port
In cavity between individual second annular protrusion b, second segment is installed with the cavity between two the second annular protrusion b away from port
It is interior, and there is gap with the cavity；The external screw thread of second screw mandrel 3 engages with the second external screw thread adaptation of the second roller 5.
The work of the operation principle of second differential type planetary roller screw pair and the first differential type planetary roller screw pair is former
Manage similar, will not be repeated here；When doing fixed-axis rotation by a certain direction of rotation, the direction of motion of the second screw mandrel and the first leading screw
The direction of motion it is opposite；Using same operation principle, the manufacture of identical processing method, simplification of flowsheet and complexity can be used
Degree, while similar assembly technology standard, reduce machining period, reduce production cost.
In an alternate embodiment of the present invention, to ensure the axial carrying capacity of screw mandrel, the wall thickness internal diameter of the first screw mandrel 2 is
0.7-0.8 times of external diameter, i.e. wall thickness are 0.2-0.3 times of external diameter, and the length dimension of the first screw mandrel 2 is more than the length of the first roller 4
Size is spent, the length of preferably the first leading screw 2 is at least 1.5 times of the length of the first roller 4；
In an alternate embodiment of the present invention, the length of the second screw mandrel 3 is more than the length of the second roller 5, preferably second
The length of bar 3 is at least 1.5 times of the length of the second roller 5；
In an alternate embodiment of the present invention, the internal diameter of the first screw mandrel 2 is bigger than the external diameter of second screw mandrel 3, to ensure
Phenomenon is interfered during both relative motions, both internal diameters of preferably the first screw mandrel 2 are bigger 2- than the external diameter of second screw mandrel 3
3mm；
In an alternate embodiment of the present invention, first annular raised a height is more than the screw thread whole depth of the first internal thread,
And the two dimension difference is more than 0.5mm, first annular raised a width is 0.1-0.3 times of the length of the first roller 4, preferably 0.2
Times, the distance between adjacent two first annular projection is 1-2 times of the first annular ledge width, preferably 1.5 times, to ensure
Roller carries and ensures to be driven more steady smoothness between roller and nut and roller and screw mandrel；
In an alternate embodiment of the present invention, the second annular protrusion b height is more than the screw thread whole depth of the second internal thread,
And the two dimension difference is more than 0.5mm, the second annular protrusion b width is 0.1-0.3 times of the second roller length, preferably 0.2
Times, the distance between adjacent two second annular protrusion is 1-2 times of the second annular protrusion width, preferably 1.5 times, to ensure
Roller carries and ensures to be driven more steady smoothness between roller and nut and roller and screw mandrel；The unspecified portion of the present invention
Belong to general knowledge as well known to those skilled in the art.Described specific embodiment is only to spirit explanation for example of the invention.
The personnel of the technical field of the invention can make different modifications or supplement or adopt to described specific embodiment
Replaced with similar mode, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Unspecified part of the present invention belongs to technology as well known to those skilled in the art.
Claims (9)
1. a kind of big stroke planetary roller screw pair, it is characterised in that including nut, the first planet roller assembly, the second planet
Roller assembly, the first screw mandrel and the second screw mandrel, first screw mandrel are arranged on the spiral shell by the first planet roller assembly
Female first end, second screw mandrel are arranged on the second end of the nut by the second planetary roller component, work as rotation
During the nut, first screw mandrel and second screw mandrel are towards or away from motion.
2. big stroke planetary roller screw pair according to claim 1, it is characterised in that first screw mandrel is hollow knot
Structure, when rotating the nut, second screw mandrel is from the insertion of one end of first screw mandrel or passes first screw mandrel
In cavity.
3. big stroke planetary roller screw pair according to claim 1, it is characterised in that：
The first planet roller assembly includes multiple first rollers and the first roller rolling retainer；
The diameter at the first roller both ends is less than main body portion diameter, and the main part is provided with first annular groove, institute
State first annular groove and the main part is divided into first paragraph and second segment, the first roller both ends and first ring
The first external screw thread is equipped with connected in star, the first paragraph and/or second segment of the main part are provided with the second external screw thread；
Three first annular projections are interval with the cavity of the nut first end, it is described first annular raised provided with first
Internal thread；
The multiple first roller is arranged on the first end of the nut, the first outer spiral shell by first roller rolling retainer
Line is engaged with first internal thread adaptation, and the first paragraph and second segment of the main part are installed with two neighboring described respectively
In cavity between first annular projection, and there is gap with the cavity；
The external screw thread of first screw mandrel engages with second external screw thread adaptation.
4. big stroke planetary roller screw pair according to claim 1, it is characterised in that：
The second planetary roller component includes multiple second rollers and the second roller rolling retainer；
The diameter at the second roller both ends is less than main body portion diameter, and the main part is provided with the second annular groove, institute
State the second annular groove and the main part is divided into first paragraph and second segment, the second roller both ends and second ring
The 3rd external screw thread is equipped with connected in star, the first paragraph and/or second segment of the main part are provided with the 4th external screw thread；
Three the second annular protrusions are interval with the cavity at the end of nut second, second annular protrusion is provided with second
Internal thread；
The multiple second roller is arranged on the second end of the nut, the 3rd outer spiral shell by second roller rolling retainer
Line is engaged with second internal thread adaptation, and the first paragraph and second segment of the main part are installed with two neighboring described respectively
In cavity between second annular protrusion, and there is gap with the cavity；
The external screw thread of second screw mandrel engages with the 4th external screw thread adaptation.
5. the big stroke planetary roller screw pair according to claim any one of 2-4, it is characterised in that：First screw mandrel
Internal diameter be 0.7-0.8 times of external diameter.
6. big stroke planetary roller screw pair according to claim 5, it is characterised in that：The length of second screw mandrel is extremely
It is 1.5 times of second roller length less.
7. big stroke planetary roller screw pair according to claim 6, it is characterised in that：The internal diameter ratio of first screw mandrel
The big 2-3mm of external diameter of second screw mandrel.
8. big stroke planetary roller screw pair according to claim 3, it is characterised in that：The first annular ledge width
For 0.1-0.3 times of first roller length, the distance between adjacent two first annular projection is the first annular projection
1-2 times of width.
9. big stroke planetary roller screw pair according to claim 4, it is characterised in that：The second ring is raised
Width be 0.1-0.3 times of second roller length, the distance between adjacent two second annular protrusion is second ring
1-2 times of shape ledge width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710718785.XA CN107524772A (en) | 2017-08-21 | 2017-08-21 | A kind of big stroke planetary roller screw pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710718785.XA CN107524772A (en) | 2017-08-21 | 2017-08-21 | A kind of big stroke planetary roller screw pair |
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| Publication Number | Publication Date |
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| CN107524772A true CN107524772A (en) | 2017-12-29 |
Family
ID=60681558
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710718785.XA Pending CN107524772A (en) | 2017-08-21 | 2017-08-21 | A kind of big stroke planetary roller screw pair |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108746709A (en) * | 2018-06-20 | 2018-11-06 | 陈浩 | A method of extending radial drilling machine robustness |
| CN109114465A (en) * | 2018-08-10 | 2019-01-01 | 尚科照明集团有限公司 | A kind of intelligent elevated type LED light |
| CN111487742A (en) * | 2020-05-29 | 2020-08-04 | 中国科学院长春光学精密机械与物理研究所 | Differential heavy-load fine adjustment mechanism |
| CN112413076A (en) * | 2020-11-25 | 2021-02-26 | 山东博特精工股份有限公司 | Differential planetary roller screw pair |
| WO2023147536A1 (en) * | 2022-01-31 | 2023-08-03 | Wagstaff, Inc. | Compact force applying device |
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| DE102014218180B3 (en) * | 2014-09-11 | 2016-01-21 | Schaeffler Technologies AG & Co. KG | Actuator with planetary roller screw (PWG) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108746709A (en) * | 2018-06-20 | 2018-11-06 | 陈浩 | A method of extending radial drilling machine robustness |
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| CN109114465A (en) * | 2018-08-10 | 2019-01-01 | 尚科照明集团有限公司 | A kind of intelligent elevated type LED light |
| CN111487742A (en) * | 2020-05-29 | 2020-08-04 | 中国科学院长春光学精密机械与物理研究所 | Differential heavy-load fine adjustment mechanism |
| CN112413076A (en) * | 2020-11-25 | 2021-02-26 | 山东博特精工股份有限公司 | Differential planetary roller screw pair |
| WO2023147536A1 (en) * | 2022-01-31 | 2023-08-03 | Wagstaff, Inc. | Compact force applying device |
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Application publication date: 20171229 |