CN204961741U - Linear transmission system - Google Patents
Linear transmission system Download PDFInfo
- Publication number
- CN204961741U CN204961741U CN201520604994.8U CN201520604994U CN204961741U CN 204961741 U CN204961741 U CN 204961741U CN 201520604994 U CN201520604994 U CN 201520604994U CN 204961741 U CN204961741 U CN 204961741U
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- linear
- sliding unit
- ball
- transmission system
- cylinder body
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Abstract
The utility model discloses a linear transmission system includes a linear mobile device and a back clearance remove device. Linear mobile device includes a linear support element, a sliding unit and a plurality of ball. Linear support element is connected to the sliding unit, and can make linear movement by support element linear relatively. Form a circulation path between linear support element and the sliding unit, on circulation path is located to these a plurality of balls, each ball have back to 2 points. Back clearance remove device pushes away the sliding unit to linear mobile device to make each ball back to 2 support to lean on linear support element and sliding unit respectively, push away to the strength direction of sliding unit parallelly with the direction of motion of sliding unit.
Description
Technical field
The utility model is relevant with Linear transmission technology, refers to a kind of linear transmission system improving positioning accurate accuracy especially.
Background technique
Generally in order to reduce the error that ball screw back clearance produces, usually extra precompression adjust structure can be increased on nut, to eliminate the back clearance produced between screw rod, nut and ball, as TaiWan, China I335391 notification number.No matter whether the precompression of ball screw exists, small clearance is still there is between screw rod, nut and ball, can roll to allow ball, but this small clearance also allows nut have degrees of freedom relative to screw axial movement a little, if without special disposal, the amount of this movement a little cannot be predicted, and this is the back clearance problem of screw drive mechanism, the validity of final impact location.
Have many mobile platforms all to utilize ball screw as main driving mechanism at present, the existence of back clearance can make the angular positioning of the built-in rotating coder of motor precisely cannot correspond to linear orientation, causes fidelity not good.Traditionally to improve, usually additionally can install linear encoder additional, above-mentioned problem is solved in the position of directly location linear motion.
Summary of the invention
Because above-mentioned disappearance, the purpose of this utility model is to provide a kind of linear transmission system, in order to eliminate the gap of linear shifter itself, improves the positioning precision of linear transmission system.
For reaching above-mentioned purpose, linear transmission system of the present utility model comprises a linear shifter and a back gap elimination device.Linear shifter comprises a linear support unit, a sliding unit and multiple ball.Sliding unit connecting linear support unit, and can move linearly by opposite linear support unit.A circulating path is formed between linear support unit and sliding unit.The plurality of ball is located on circulating path, each ball have back to 2 points.Back gap elimination device pushing and pressing linear shifter sliding unit, with make each ball back to 2 respectively against linear support unit and sliding unit, pushing and pressing sliding unit strength direction parallel with the moving direction of sliding unit.
So, linear transmission system of the present utility model applies the strength of specific direction to sliding unit by back gap elimination device, and make the plurality of ball be positioned homonymy, because axial gap accurately cannot complete location, to improve the positioning accurate accuracy in linear transmission system stroke when avoiding locating between ball and linear support unit and sliding unit.
About the detailed configuration of linear transmission system provided by the utility model, feature, assembling or usage mode, described in describing in detail in follow-up mode of execution.But have in the utility model field and usually know that the knowledgeable should be able to understand, these describe in detail and implement the specific embodiment cited by the utility model, only for illustration of the utility model, and be not used to the scope limiting the utility model patent protection.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the linear transmission system of short stroke of the present utility model.
Fig. 2 is the cross-sectional schematic of ball screw and back gap elimination device in Fig. 1.
Fig. 3 is the schematic diagram of another embodiment of the linear transmission system of Long travel of the present utility model.
Embodiment
Below, hereby coordinate each graphic preferred embodiment enumerating correspondence to the composition component of linear transmission system of the present utility model and reach effect to explain.The component of right each graphic neutral line transmission system, size and outward appearance are only used for technical characteristics of the present utility model is described, but not are construed as limiting the utility model.
As shown in Figure 1, linear transmission system 10 of the present utility model comprises linear shifter 11 and a back gap elimination device 13.Back gap elimination device 13, in order to restriction and the back clearance eliminating linear shifter 11 itself, improves the degree of accuracy of the operation of linear shifter 11.
As shown in Figure 2, in this embodiment, linear shifter 11 illustrates for ball screw, and therefore, in the present embodiment, ball screw represents with identical component symbol 11 with linear shifter.
Ball screw 11 comprises a screw rod (i.e. linear support unit) 111, a nut (i.e. sliding unit) 113 and multiple ball 115.Nut 113 is the screw rod 111 that is spirally connected, and forms a ball circulation paths 117 with screw rod 111.The plurality of ball 115 is located in ball circulation paths 117.Each ball 115 have back to 2 points, be contacted with P1, P2 at 2 with screw rod 111 and nut 113 respectively.
Back gap elimination device 13 pushes against the nut 113 of ball screw 11, to make the plurality of ball 115 be fixed on homonymy, so, each ball 115 back to 2 respectively against screw rod 111 and nut 113.The strength F direction of pushing and pressing nut 113 is parallel with screw rod 111 nut 113 moving direction.
Referring again to Fig. 1, this figure shows the linear transmission system 10 of short stroke, and back gap elimination device 13 is one have bar cylinder, has bar cylinder to comprise air pressure cylinder body 131 and a piston rod 133.Piston rod 133 is located in air pressure cylinder body 131, and relative barometric pressure cylinder body 131 does flexible (linearly) motion with the gas pressure change in air pressure cylinder body 131.Piston rod 133 pushes against nut 113.So, back gap elimination device 13 can make piston rod 133 pairs of nuts 113 provide a thrust by the gas pressure controlled in air pressure cylinder body 131, when eliminating ball screw 11 state of rest, the degrees of freedom of the movement a little between nut 113 and screw rod 111, and the mobile platform 17 be installed on nut 113 is accurately positioned.
In linear transmission system 10 of the present utility model, there is back gap elimination device 13, therefore, no matter ball screw 11 to be in operation or ball screw 11 is state of rest, all can limit the nut 113 of ball screw 11 and the degrees of freedom of the movement a little of screw rod 111 by back gap elimination device 13.
In general, when nut 113 is moved into locating point, ball screw 11 belongs to state of rest, and the frictional force that is ball screw 11 is own and motor do not drive screw rod 111 to rotate, and therefore, nut 113 can not move relative to screw rod 111.Now, back gap elimination device 13 pairs of nuts 113 apply thrust regularly, reach the object eliminating back clearance, and improve positioningly precision.Therefore, no matter motor driving screw rod 111 rotates, and when nut 113 is moved to any position location of screw rod 111, back gap elimination device 13 can apply fixing thrust by the nut 113 of contraposition in position location, improves setting accuracy.
As shown in Figure 3, this figure shows the linear transmission system 30 of Long travel.In this embodiment, linear shifter 31 is for servo slide table, and servo slide table comprises ball screw 311, slide rail 315 and a servomotor (not shown).Ball screw 311 comprises screw rod 312, nut 313 and a multiple ball, and previous embodiment has the problem of identical back clearance, repeats no more this problem in this.Servomotor makes ball screw 311 run, and by industry known, therefore not repeat in this.
Back gap elimination device 33 is one without bar cylinder, without bar cylinder with have the Main Differences of bar cylinder to be there is no piston rod as guiding movement without bar cylinder, the advantage of Long travel movement can be reached easily.Be utilize gas, magnetic force and cable wire etc. to allow piston move without bar cylinder, the advantage of Long travel can be reached easily.Back gap elimination device 33 comprises linear cylinder body 331, piston slider 333 and a block 335.Linear cylinder body 331 be arranged in parallel with ball screw 31.On piston slider 333 connecting linear cylinder body 331, and front and rear direction motion can be done in linear cylinder body 331.Block 335 connects piston slider 333, and moves with piston slider 333, and pushes against the nut 313 of ball screw 31.So, back gap elimination device 33 by mobile piston slide block 333, and makes block 335 pairs of nuts 313 apply the thrust of fixed-direction, eliminates the back clearance of ball screw 311, to improve the positioning accurate accuracy of the ball screw of Long travel.
Although in above-mentioned two embodiments, the ball screw of different stroke is arranged in pairs or groups different back gap elimination devices respectively, but in fact, above-mentioned back gap elimination device is all the effect by keeping equidirectional fixing thrust to eliminate to reach back clearance, therefore the utility model not with above-mentioned two embodiments describe and combination is limited, and not to have bar cylinder and to be limited without bar cylinder.
Above, describe linear shifter when state of rest, back gap elimination device of the present utility model eliminates technology and effect of linear shifter back clearance, and in illustrating that linear shifter runs subsequently, linear transmission system of the present utility model eliminates the mode of back clearance.
It should be noted that no matter back gap elimination device adopts which kind of configuration, and its means are all identical, and therefore, the present embodiment illustrates for Long travel ball screw collocation back gap elimination device.
Referring again to Fig. 3, when the screw rod 312 of the ball screw 311 of linear shifter 31 rotates, and when driving nut 313 to move forward along screw rod 312, piston slider 333 frenulum of back gap elimination device 33 moves block 335 synchronously to the thrust that the nut 313 of ball screw 311 applies forward, and make the ball of ball screw 31 back to 2 contact with nut 313 with its screw rod 312 respectively, improve the precision of servo slide table in operation.
In sum, linear transmission system of the present utility model does not need additionally to install linear encoder, and make the thrust sliding unit of linear shifter being applied to specific direction, to eliminate the back clearance of linear shifter itself, improve the positioning accurate accuracy of sliding unit.
Finally, again emphasize, the utility model, in front taking off composed component disclosed in embodiment, is only and illustrates, be not used for limiting the protection domain of this case, substituting or change of other equivalence elements, also should be this case scope of patent protection and contained.
Claims (6)
1. a linear transmission system, is characterized in that, comprising:
One linear shifter, comprise a linear support unit, a sliding unit and multiple ball, this sliding unit connects this linear support unit, and relatively can make Linear-moving by this linear support unit, a circulating path is formed between this linear support unit and this sliding unit, the plurality of ball is positioned on this circulating path, each ball have back to 2 points; And a back gap elimination device, push against the sliding unit of this linear shifter, with make each ball back to 2 respectively against this linear support unit and this sliding unit, the strength direction pushing against this sliding unit is parallel with the moving direction of this sliding unit.
2. linear transmission system according to claim 1, it is characterized in that, this back gap elimination device comprises an air pressure cylinder body and a piston rod, and this piston rod is located in this air pressure cylinder body, and can relatively move linearly by this air pressure cylinder body, this piston rod pushes against this sliding unit.
3. linear transmission system according to claim 1, it is characterized in that, this back gap elimination device comprises an air pressure cylinder body, a piston slider and a block, this piston slider connects this air pressure cylinder body, and move linearly along this air pressure cylinder body, this block connects this piston slider, and pushes against this sliding unit.
4. linear transmission system according to claim 3, is characterized in that, this air pressure cylinder body is parallel with this linear support unit.
5. the linear transmission system according to claim 1,2,3 or 4, is characterized in that, this linear shifter is a servo slide table.
6. the linear transmission system according to claim 1,2,3 or 4, is characterized in that, this linear shifter is a ball screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520604994.8U CN204961741U (en) | 2015-08-12 | 2015-08-12 | Linear transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520604994.8U CN204961741U (en) | 2015-08-12 | 2015-08-12 | Linear transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204961741U true CN204961741U (en) | 2016-01-13 |
Family
ID=55056810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520604994.8U Expired - Fee Related CN204961741U (en) | 2015-08-12 | 2015-08-12 | Linear transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204961741U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051096A (en) * | 2016-07-14 | 2016-10-26 | 青岛金光鸿智能机械电子有限公司 | Device and method for transferring load-bearing unit guide rails |
-
2015
- 2015-08-12 CN CN201520604994.8U patent/CN204961741U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051096A (en) * | 2016-07-14 | 2016-10-26 | 青岛金光鸿智能机械电子有限公司 | Device and method for transferring load-bearing unit guide rails |
| CN106051096B (en) * | 2016-07-14 | 2019-01-25 | 青岛金光鸿智能机械电子有限公司 | Bearing unit guide rail transfer device and method |
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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 |
Granted publication date: 20160113 Termination date: 20170812 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |