CN101806345A - Bidirectional rolling combined screw pair - Google Patents
Bidirectional rolling combined screw pair Download PDFInfo
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- CN101806345A CN101806345A CN200910235005A CN200910235005A CN101806345A CN 101806345 A CN101806345 A CN 101806345A CN 200910235005 A CN200910235005 A CN 200910235005A CN 200910235005 A CN200910235005 A CN 200910235005A CN 101806345 A CN101806345 A CN 101806345A
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Abstract
The invention relates to a bidirectional rolling combined screw pair. The combined screw pair is characterized by comprising two types of screw pairs, wherein one type is a rolling screw pair for forming rolling friction between a screw rod and a nut through a rolling body, and the other type is a sliding screw pair for forming sliding friction between the screw rod and the nut; bidirectional rolling friction functional region or rolling-sliding functional region are respectively formed in different lengths of the same screw rod by increasing the groove width of a sliding tooth of the screw rod or changing the groove widths of the sliding tooth and a rolling tooth of the screw rod and a distance between the sliding tooth and the rolling tooth. The combined screw pair has the advantages of complementing the advantages and disadvantages of the two types of screw pairs by combining the two types of screw pairs, forming the bidirectional rolling friction functional region or rolling-sliding functional region in different lengths of the same screw rod and forming rolling friction when the screw rod drives the nut to move upwards and forming sliding friction when the screw rod drives the nut to move downwards through a combined nut.
Description
Technical field
The present invention relates to is a kind of combined screw pair of Double roll, belongs to the power screw technical field in the mechanical transmission.
Background technique
Power screw generally can be divided into sliding spiral pair and rolling screw pair by Frotteurism between screw thread.Sliding spiral pair surface friction drag is big, and efficient is low, but the energy self-locking; Rolling screw pair surface friction drag is little, the efficient height, but can not self-locking.
Summary of the invention
The invention provides a kind of combined screw pair of Double roll, have the function of Double roll friction.
Technical solution of the present invention: it is characterized in that by two kinds of screw pairs, wherein a kind of is rolling screw pair, make screw mandrel and nut form rolling friction by rolling element, another kind is a sliding spiral pair, screw mandrel and nut form sliding friction, the width of the flute profile by adding big wire role slip tooth, or change screw mandrel slip tooth and the flute profile width of rolling tooth and mutual distance thereof, be implemented in the difference in functionality zone that has Double roll friction, a roll and a slide on the different length zone of the same filament bar respectively.
Advantage of the present invention: two kinds of screw pairs are grouped together, make their merits and demerits obtain complementation, in the different length zone of screw mandrel, can realize the difference in functionality zone of Double roll friction, two-way sliding friction and a roll and a slide respectively, in the time of also can realizing that screw mandrel drive nut moves upward by assembled nut is rolling friction, is the function of sliding friction when moving downward.The advantage of combined screw pair A is that screw mandrel processing is simple and convenient; The advantage of combined screw pair B is, screw mandrel can be single tooth, and volume is little.
Description of drawings
Fig. 1 is the schematic representation that is rolling friction left, to the right for the 1. described screw pair of the embodiment of the invention.
Fig. 2 is the schematic representation that is rolling friction left, to the right for the 2. described screw pair of the embodiment of the invention.
Fig. 3 is the schematic representation that is sliding friction left, to the right for the 3. described screw pair of the embodiment of the invention.
Fig. 4 is the schematic representation that is sliding friction left, to the right for the 4. described screw pair of the embodiment of the invention.
Fig. 5 represents the schematic representation of t 1, t2 for the present invention.T1, t2 represent the width of dovetail groove and half kidney slot among the combined screw pair A respectively.
Fig. 6 for embodiment 5. screw pair be the schematic representation of a roll and a slide function.
Fig. 7 for embodiment 6. screw pair be the schematic representation of a roll and a slide function.
Fig. 8 is the embodiment of the invention a kind of distortion (being the mode of execution that screw mandrel changes a direction) 5..
Fig. 9, Figure 10 are that screw mandrel thread form well width is constant among the 7. described combined screw pair A of the embodiment of the invention, use assembled nut to realize that when screw mandrel drive nut moves upward be rolling friction, are the schematic representation of the function of sliding friction when moving downward.
Figure 11, Figure 12 are the another kind of structure of the assembled nut among the 8. described combined screw pair A of embodiment.
Figure 13 represent C to schematic representation.Figure 14 represent D to schematic representation.
Figure 15 is meant among the combined screw pair A that the thread form type of slip tooth is circular schematic representation.
Figure 16, Figure 17 are the schematic representation of the 9. described combined screw pair B of the embodiment of the invention.
Figure 18, Figure 19 are the another kind of structures of the assembled nut among the 10. described combined screw pair B of embodiment.
Among the figure, the 1st, the A nut, the 2nd, the A rolling element, the 3rd, embodiment is described screw mandrel 1.～6., 7. and 8. described thread form groove screw mandrel the 4, embodiment, the 5th, B rolling element, the 6th, A ball nut, the 7th, A plane bearing, the 8th, the A sliding nut, the 9th, pin, the 10th, cotter way, the 11st, the 4. described B nut of embodiment, the 12nd, the 6. described C nut of embodiment, the 13rd, the circular tooth described in the slip tooth, 14 is half kidney slot screw mandrels, the 15th, the C rolling element, the 16th, the B ball nut, the 17th, B plane bearing, the 18th, the 2. described D nut of embodiment, the 19th, B sliding nut.
Embodiment
Combined screw pair is made up of two kinds of screw pairs, and wherein a kind of is rolling screw pair, makes screw mandrel and nut form rolling friction by rolling element, and another kind is a sliding spiral pair, and screw mandrel and nut form sliding friction.The thread form groove of screw mandrel in the rolling screw pair is called rolling groove, the thread form groove of screw mandrel in the sliding spiral pair is called sliding-groove; The thread form of nut in the rolling screw pair is called the rolling tooth, the thread form of nut in the sliding spiral pair is called the slip tooth.Rolling groove and sliding-groove can be inequality, also can be identical.Below that rolling groove is different with sliding-groove situations, be called combined screw pair A, in the same length range of screw mandrel, the thread form groove of two kinds of screw pairs intersects, rolling tooth on the nut and slip tooth are described with circular tooth and trapezoidal tooth respectively, rolling groove on the screw mandrel and sliding-groove are described with circle (waist) shape groove and dovetail groove respectively.The situation that rolling groove on the screw mandrel is identical with sliding-groove is called combined screw pair B, is described with half kidney slot.
Combined screw pair A
At the screw mandrel length direction, it is to change and two kinds of constant structures that combined screw pair A divides the width of the thread form groove of screw mandrel.The feature of combined screw pair A is that the thread form groove of screw mandrel in the thread form groove of screw mandrel in the rolling screw pair and the sliding spiral pair is inequality.
One, the change width of the thread form groove of screw mandrel
The variable-width of the thread form groove of the screw mandrel among the combined screw pair A, the thread form width of nut is constant.Describe for convenient, suppose that nut maintains static, screw mandrel is subjected to the length direction active force, divides four kinds of structures to inquire into.
Below only use dovetail groove and circle (waist) shape groove to explain sliding-groove and rolling groove respectively, explain slip tooth and rolling tooth respectively with trapezoidal tooth and circular tooth.
Structure one:, realize Double roll friction function by adding the width of big wire role dovetail groove.
Combined screw pair A: the A nut 1 that is used with screw mandrel 3 is constant, and the size of the circular trough of screw mandrel 3 just cooperates with ball 2, and the width of screw mandrel dovetail groove is greater than the width of the trapezoidal tooth of nut.
Embodiment is 1.: as shown in Figure 1, when the circular trough semicircular in shape of screw mandrel 3, size just cooperates with A rolling element 2, and the width of screw mandrel dovetail groove is during greater than the width of the trapezoidal tooth of nut, and state promptly shown in Figure 1 is rolling friction left, to the right.
Embodiment is 2.: can realize a kind of scheme of Double roll friction equally, promptly as shown in Figure 2.What this embodiment and the foregoing description were 1. inequality is, in embodiment's nut 1., trapezoidal tooth and circular tooth intersect, and the screw thread of nut separates in the present embodiment, and a kind of thread form is preceding, another kind of thread form after.
Structure two: in the different length zone of screw mandrel,, realize two-way sliding friction function by strengthening the width of circular trough.
The feature of combined screw pair A is: the A nut 1 that is used with screw mandrel 3 is constant, and the circular trough of screw mandrel 3 is half waist shape, and screw mandrel dovetail groove size matches with the trapezoidal tooth of nut.
Embodiment is 3.: as shown in Figure 3, when the circular trough of screw mandrel 3 is half waist shape, when screw mandrel dovetail groove size matched with the trapezoidal tooth of nut, promptly state as shown in Figure 3 was sliding friction left, to the right.
Embodiment is 4.: can realize a kind of scheme of two-way sliding friction equally, promptly as shown in Figure 4.Should
What embodiment and the foregoing description were 3. inequality is, in embodiment's nut 3., trapezoidal tooth and circular tooth intersect, and the screw thread of nut separates in the present embodiment, and a kind of thread form is preceding, another kind of thread form after.
Structure three: in the different length zone of screw mandrel, the mutual edge distance mutually between the width by changing two kinds of thread form grooves and two kinds of thread forms realizes as positive acting power being rolling friction, is the function of sliding friction when then active force is reverse.
Below explain sliding-groove and rolling groove respectively, explain slip tooth and rolling tooth respectively with trapezoidal tooth and circular tooth with dovetail groove and circle (waist) shape groove.
The feature of combined screw pair A is: the A nut 1 that is used with screw mandrel 3 is constant, the width of screw mandrel dovetail groove is greater than the width of the trapezoidal tooth of nut, the circular trough of screw mandrel 3 is half waist shape, its length is greater than the diameter of A rolling element 2, and the phase mutual edge distance between two kinds of thread forms is unequal, and promptly the center of dovetail groove is not positioned at the center of adjacent two halves kidney slot in this length range of screw mandrel.
As shown in Figure 6, when the circular trough of screw mandrel 3 was half waist shape, the distance of establishing between two centers of circle of half kidney slot was A, when A rolling element 2 moves to the right side of half waist shape as shown in the figure, the gap on the trapezoidal tooth left side of the width of screw mandrel dovetail groove and nut is B, and A＞B.
Phase mutual edge distance between described two kinds of thread forms is unequal, is meant that the center of dovetail groove in this length range of screw mandrel is not positioned at the center of adjacent two halves kidney slot.
Embodiment is 5.: when nut maintains static, when screw mandrel is subjected to left active force, be rolling friction, the trapezoidal tooth on this moment nut does not contact with the dovetail groove on the screw mandrel, and promptly trapezoidal thread is inoperative; When screw mandrel was subjected to the right active force, screw mandrel moved right, and this moment, the A rolling element 2 did not contact with half kidney slot on the screw mandrel length direction, be that A rolling element 2 is inoperative, the trapezoidal tooth of nut contacts with the dovetail groove of screw mandrel, and this moment, trapezoidal thread worked, and is sliding friction during screw mandrel work.
In like manner, as shown in Figure 8, it is rolling friction that screw mandrel is subjected to active force to the right, and being subjected to active force left is sliding friction.
Embodiment is 6.: can realize a kind of scheme of a roll and a slide function equally, promptly as shown in Figure 7.What this embodiment and the foregoing description were 5. inequality is, in embodiment's nut 5., trapezoidal tooth and circular tooth intersect, and the screw thread of nut separates in the present embodiment, and a kind of thread form is preceding, another kind of thread form after.
Structure four: said structure one, structure two and structure three are combined use, under the constant situation of nut, realize a plurality of different functional areas on the same filament bar, promptly by strengthening the width of dovetail groove, or the width of increasing circular trough, or the mutual edge distance mutually between the width that changes two kinds of thread form grooves and two kinds of thread forms, be implemented in the different length zone of screw mandrel, have the difference in functionality zone of two-way sliding friction, Double roll friction or a roll and a slide.Below with three kinds of combination statements.
Combination one: structure one and structure three combinations
The feature of combined screw pair A is: the A nut 1 that is used with screw mandrel 3 is constant, and the circular trough of screw mandrel 3 is half waist shape, divides two kinds of functional areas of two-way sliding friction and a roll and a slide on the screw mandrel.
Combination two: structure two and structure three combinations
The feature of combined screw pair A is: the A nut 1 that is used with screw mandrel 3 is constant, and the dovetail groove of screw mandrel 3 divides two kinds of functional areas of Double roll friction and a roll and a slide greater than the trapezoidal tooth of nut on the screw mandrel.
Combination three: structure one, structure two and structure three combinations
The feature of combined screw pair A is: the A nut 1 that is used with screw mandrel 3 is constant, divides three kinds of functional areas of two-way sliding friction, Double roll friction and a roll and a slide on the screw mandrel.
Two, the width of the thread form groove of screw mandrel is that constant thread form groove screw mandrel 4 is to have two teeth, wherein a tooth constitutes the rolling screw transmission by B rolling element 5 and B nut 6, another tooth and sliding nut constitute the slip screw transmission, and the width of the thread form groove of screw mandrel or size are constant.Below with the thread form of the thread form of rolling screw transmission on the screw mandrel and slip screw transmission respectively with circular tooth and the statement of trapezoidal tooth.
Screw mandrel among the combined screw pair A is constant at the width of its two kinds of thread form grooves of length direction, the assembled nut that is used with thread form groove screw mandrel 4 is by A sliding nut 8, A ball nut 6, pin 9, A plane bearing 7 and B rolling element 5 are formed, wherein A ball nut 6 and A sliding nut 8 have A plane bearing 7 between the screw mandrel length direction, pin 9 is located between ball nut and the sliding nut, have cotter way on ball nut or the sliding nut, pin and sliding nut or ball nut are connected, pin can move in cotter way, assembled nut is by changing the distance between A ball nut 6 and the A sliding nut 8, promptly change the distance between its circular tooth and the trapezoidal tooth, realizing that when screw mandrel drive nut moves upward be rolling friction, is the function of sliding friction when moving downward.
Satisfy at pressure angle under the condition of self-locking, A sliding nut 8 and screw mandrel in this assembled nut are self-lockings.
The two limit positions of pin 9 in cotter way 10, the two states of rolling friction and sliding friction in the corresponding combined screw pair respectively.
One, sliding friction becomes the process of rolling friction.
Suppose that the home position as shown in Figure 9, A plane bearing 7 and A ball nut 6 no gaps, B rolling element 5 is contactless at half kidney slot of screw mandrel length direction and screw mandrel, pin 9 corresponding key plan in cotter way 10 is Figure 14, power F is passed to rolling element by A ball nut 6 and acts on sliding nut 8, and promptly this moment, assembled nut was in the sliding friction state.During the screw mandrel rotation, because the sliding friction torque of A sliding nut 8 and thread form groove screw mandrel 4 is much larger than the rolling friction torque of itself and A plane bearing 7, so A sliding nut 8 is followed screw mandrel 4 with screw mandrel 4 no relative displacements and is rotated, pin 9 moves in cotter way 10 from right to left, the half kidney slot bottom of screw mandrel 4 contacts B rolling element 5 gradually, driving ball nut 6 moves upward, make plane bearing 7 and A ball nut 6 produce the gap, pin 9 moves to position shown in Figure 13 in cotter way 10, because the effect of pin, sliding nut moves upward with A ball nut 6.Because the quality of A sliding nut 8 is ignored, B rolling element 5 works at this moment, and directed force F is born by A ball nut 6 downwards, so be rolling friction at this moment.
Two, rolling friction becomes the process of sliding friction.
Suppose that the home position as shown in figure 10, A plane bearing 7 is gapped with A ball nut 6, B rolling element 5 contacts with the half kidney slot bottom of screw mandrel at the screw mandrel length direction, pin 9 corresponding key plan in cotter way 10 is Figure 13, A sliding nut 8 is strength F not, and promptly this moment, assembled nut was in the rolling friction state.When the screw mandrel counterrotating begins, the moving sliding nut 8 of thread form groove screw mandrel 4 band A rotates together, be thread form groove screw mandrel 4 and the 8 no relative displacements of A sliding nut, pin 9 is moved in cotter way 10 from left to right, A ball nut 6 moves downward, it is contacted with A plane bearing 7, thread form groove screw mandrel 4 continues rotation, B rolling element 5 breaks away from the bottom of half kidney slot of thread form groove screw mandrel 4 gradually, promptly contactless at screw mandrel length direction and half kidney slot, power F acts on A sliding nut 8 by A ball nut 6 through A plane bearing 7, this moment, pin 9 moved to position shown in Figure 14 in cotter way 10, since the effect of pin 9, A ball nut 6 with A sliding nut 8 with moving downward.This moment, B rolling element 5 was inoperative, and directed force F is born by A sliding nut 8 downwards, so be sliding friction at this moment.Rolling element can be ball or roller.
8. shown in Figure 11,12, ball nut is to be embedded in the sliding nut to embodiment, and this embodiment's principle is 7. identical with embodiment, no longer describes herein.
Combined screw pair B is meant that the thread form groove of the thread form groove of screw mandrel rolling tooth and slip tooth is identical, and the thread form groove of screw mandrel is half kidney slot.The assembled nut that matches with half kidney slot screw mandrel 14 is by B sliding nut 19, B ball nut 16, pin 9, B plane bearing 17 and C rolling element 15 are formed, wherein B ball nut 16 and B sliding nut 19 have B plane bearing 17 between the screw mandrel length direction, pin is located between B ball nut and the B sliding nut, have cotter way on B ball nut or the B sliding nut, pin and B sliding nut or B ball nut are connected, pin can move in cotter way, assembled nut is by changing the distance of 16 of B sliding nut 19 and B ball nuts, promptly change two kinds of distances that tooth shapes is mutual, realizing that when screw mandrel drive nut moves upward be rolling friction, is the function of sliding friction when moving downward
One, sliding friction becomes the process of rolling friction.
Suppose that the home position as shown in figure 16, B plane bearing 17 and B ball nut 16 no gaps, C rolling element 15 is contactless at half kidney slot of screw mandrel length direction and screw mandrel, pin 9 corresponding key plan in cotter way 10 is Figure 14, power F is passed to rolling element by B ball nut 16 and acts on B sliding nut 19, and promptly this moment, assembled nut was in the sliding friction state.During 14 rotations of half kidney slot screw mandrel, because the sliding friction torque of B sliding nut 19 and half kidney slot screw mandrel 14 is much larger than the rolling friction torque of itself and B plane bearing 17, so B sliding nut 19 is followed half kidney slot screw mandrel 14 with the 14 no relative displacements of half kidney slot screw mandrel and is rotated, pin 9 moves in cotter way 10 from right to left, the half kidney slot bottom of half kidney slot screw mandrel 14 contacts C rolling element 15 gradually, driving B ball nut 16 moves upward, make B plane bearing 17 and B ball nut 16 produce the gap, pin moves to position shown in Figure 13 in cotter way, because the effect of pin 9, B sliding nut 19 moves upward with B ball nut 16.Because the quality of sliding nut 19 is ignored, C rolling element 15 works at this moment, and directed force F is born by B ball nut 16 downwards, so be rolling friction at this moment.
Two, rolling friction becomes the process of sliding friction.
Suppose that the home position as shown in figure 17, B plane bearing 17 is gapped with B ball nut 16, C rolling element 15 contacts with the half kidney slot bottom of screw mandrel at the screw mandrel length direction, pin 9 corresponding key plan in cotter way 10 is Figure 13, B sliding nut 19 is strength F not, and promptly this moment, assembled nut was in the rolling friction state.When the screw mandrel counterrotating begins, half kidney slot screw mandrel 14 drives B sliding nut 19 and rotates together, i.e. half kidney slot screw mandrel 14 and the 19 no relative displacements of B sliding nut, pin 9 is moved in cotter way 10 from left to right, B ball nut 16 moves downward, it is contacted with B plane bearing 17, half kidney slot screw mandrel 14 continues rotation, C rolling element 15 breaks away from the bottom of half kidney slot of half kidney slot screw mandrel 14 gradually, promptly contactless at screw mandrel length direction and half kidney slot, power F acts on B sliding nut 19 by B ball nut 15 through B plane bearing 17, this moment, pin 9 moved to position shown in Figure 14 in cotter way 10, since the effect of pin 9, B ball nut 16 with B sliding nut 19 with moving downward.This moment, C rolling element 15 was inoperative, and directed force F is born by B sliding nut 19 downwards, so be sliding friction at this moment.
Shown in Figure 18,19, ball nut is to be embedded in the sliding nut, and this embodiment's principle is 9. identical with embodiment, no longer describes herein.
Claims (1)
1. the combined screw pair of Double roll, it is characterized in that by two kinds of screw pairs, wherein a kind of is rolling screw pair, make screw mandrel and nut form rolling friction by rolling element, another kind is a sliding spiral pair, screw mandrel and nut form sliding friction, the width of the flute profile by adding big wire role slip tooth, or change screw mandrel slip tooth and the flute profile width of rolling tooth and mutual distance thereof, be implemented in the difference in functionality zone that has Double roll friction, a roll and a slide on the different length zone of the same filament bar respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910235005A CN101806345A (en) | 2009-11-16 | 2009-11-16 | Bidirectional rolling combined screw pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910235005A CN101806345A (en) | 2009-11-16 | 2009-11-16 | Bidirectional rolling combined screw pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101806345A true CN101806345A (en) | 2010-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910235005A Pending CN101806345A (en) | 2009-11-16 | 2009-11-16 | Bidirectional rolling combined screw pair |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101806345A (en) |
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2009
- 2009-11-16 CN CN200910235005A patent/CN101806345A/en active Pending
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Address after: 214112 No. 121, Xinhua Road New District, Jiangsu, Wuxi Applicant after: Jiangsu Susheng Automation Equipment Co., Ltd. Address before: 214122 Jiangsu 121 speed automation equipment system engineering Co., Ltd., Xinhua Road, Wuxi, Jiangsu Applicant before: Jiangsu Susheng Automation Equipment System Engineering Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: JIANGSU SUSHENG AUTOMATION EQUIPMENT SYSTEM ENGINEERING CO., LTD. TO: JIANGSU SUSHENG AUTOMATION EQUIPMENT CO., LTD. |
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Open date: 20100818 |