CN103545978A - Electric pushing rod - Google Patents
Electric pushing rod Download PDFInfo
- Publication number
- CN103545978A CN103545978A CN201310505944.XA CN201310505944A CN103545978A CN 103545978 A CN103545978 A CN 103545978A CN 201310505944 A CN201310505944 A CN 201310505944A CN 103545978 A CN103545978 A CN 103545978A
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- China
- Prior art keywords
- ball
- ball nut
- nut
- screw
- pushing rod
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Abstract
The invention relates to the field of pushing rods, in particular to an electric pushing rod with ball splines. The electric pushing rod comprises a shell, a pushing rod piece, a ball screw, a ball nut, a coupler and a servo motor. The ball nut is in threaded connection with the ball screw, the ball nut and the ball screw are both arranged in the shell, the servo motor is in drive connection with the ball screw through the coupler, the pushing rod piece is connected to one end of the shell in an inserted mode and is connected with the ball nut, a plurality of sets of rolling paths are formed in the ball nut and in the inner wall of the shell, balls are arranged in the rolling paths, and the rolling paths and the balls form the ball splines. According to the electric pushing rod, the ball nut and the ball screw only bear pure tension or pressure, and therefore the service life of a ball screw pair is prolonged.
Description
Technical field
The present invention relates to push rod field, is especially a kind of electric pushrod with ball spline.
Background technology
Electric pushrod is a kind of linear actuating device, utilizes screw nut driven, rotatablely moving of CD-ROM drive motor is changed into the rectilinear motion of push rod.Can be used for as carrying out machinery, using in various simple or complicated technological processes, to realize far distance controlled, centralized control or automatically to control.Electric pushrod is widely used in electric bed for medical purpose, Electric sofa, electronic exhibition booth elevating lever, electric industrial jacking system etc.
Traditional electric pushrod structure is as shown in 1 figure, and servomotor 12 drives ball-screw to turn 5 by shaft coupling 11 and moves, and ball nut 7 slides along the gathering sill of housing 8 inner sides, thereby drives push rod 4 front and back to slide.Owing to inevitably having gap between the guide runner 6 on ball nut 8 and gathering sill, thus remote-effects the positioning precision of electric pushrod, this point affects very serious on servo-electric push rod.In addition, due to the restriction of drive mechanism, the stressed radial component of push rod 4 acts directly on ball nut 7.This also can affect to the life-span of lead screw pair.
Summary of the invention
The object of the invention is to address the above problem, and a kind of electric pushrod with ball spline is provided, and specifically by following technical scheme, is realized.
A kind of electric pushrod, it is characterized in that comprising housing, push rod, ball-screw, ball nut, shaft coupling and servomotor, described ball nut is threaded with ball screw and both are all placed in housing, described servomotor is driven and is connected with described ball screw by shaft coupling, described push rod is plugged in housing one end and is connected with described ball nut, described ball nut and inner walls are provided with some groups of raceways, described raceway is built-in with ball, and described raceway and ball form ball spline.
Its further design of described electric pushrod is that the outer wall of described ball nut and corresponding inner walls are provided with relative semicircle conduit, in described ball nut, be provided with the circular hole being communicated with described semicircle conduit, described semicircle conduit and circular hole form described raceway.
The present invention adopts particular design transmission nut, and nut inner side is identical with common ball nut, and outside is designed with the raceway rolling vertically for ball, in push rod bucket wall inner side, is designed with raceway vertically.Like this, nut and bucket wall form linear splines pair.When ball-screw rotates, ball spline nuts is moved vertically, and due to the existence of rolling spline, ball spline nuts self can not be rotated and can only be moved vertically.Meanwhile, guide runner is replaced by the ball of continuous rolling, thereby has reduced gearing friction power, has improved transmission efficiency.When push rod bears certain radial load, radial load is born by ball spline, thereby makes ball nut and ball-screw only bear simple pulling force or pressure, thereby improves the useful life of ball screw assembly.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing electric pushrod.
Fig. 2 is structural representation of the present invention.
Fig. 3 is A-A cross-section structure shown in Fig. 2.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the present invention is further described.
This electric pushrod, comprise housing 1, push rod 2, ball-screw 3, ball nut 4, shaft coupling 5 and servomotor 6, ball nut 4 is threaded with ball screw 3 and both are all placed in housing 1, servomotor 6 is driven and is connected with ball screw 3 by shaft coupling 5, push rod 2 is plugged in housing 1 one end and is connected with ball nut, the outer wall of ball nut and corresponding inner walls are provided with relative semicircle conduit, in ball nut, be provided with the circular hole being communicated with semicircle conduit, semicircle conduit and circular hole form raceway, ball nut 4 is provided with four groups of raceways with housing 1 inwall, raceway is built-in with ball 7, raceway and ball form ball spline 8.
During operation, thereby servomotor is ordered about when ball screw rotation drives ball nut to rotate in housing and is driven push rod to move at housing inner branch line by shaft coupling.
The present invention adopts particular design transmission nut, and nut inner side is identical with common ball nut, and outside is designed with the raceway rolling vertically for ball, in push rod bucket wall inner side, is designed with raceway vertically.Like this, nut and bucket wall form linear splines pair.When ball-screw rotates, ball nut moves vertically, and due to the existence of rolling spline, ball nut self can not rotate and can only move vertically.Meanwhile, guide runner is replaced by the ball of continuous rolling, thereby has reduced gearing friction power, has improved transmission efficiency.When push rod is born certain radial load, radial load is born by ball spline, thereby makes ball nut and ball-screw only bear simple pulling force or pressure, thereby improves the useful life of ball screw assembly.
Claims (2)
1. an electric pushrod, it is characterized in that comprising housing, push rod, ball-screw, ball nut, shaft coupling and servomotor, described ball nut is threaded with ball screw and both are all placed in housing, described servomotor is driven and is connected with described ball screw by shaft coupling, described push rod is plugged in housing one end and is connected with described ball nut, described ball nut and inner walls are provided with some groups of raceways, described raceway is built-in with ball, and described raceway and ball form ball spline.
2. electric pushrod according to claim 1, the outer wall and the corresponding inner walls that it is characterized in that described ball nut are provided with relative semicircle conduit, in described ball nut, be provided with the circular hole being communicated with described semicircle conduit, described semicircle conduit and circular hole form described raceway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310505944.XA CN103545978A (en) | 2013-10-24 | 2013-10-24 | Electric pushing rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310505944.XA CN103545978A (en) | 2013-10-24 | 2013-10-24 | Electric pushing rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103545978A true CN103545978A (en) | 2014-01-29 |
Family
ID=49969142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310505944.XA Pending CN103545978A (en) | 2013-10-24 | 2013-10-24 | Electric pushing rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103545978A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105213127A (en) * | 2015-11-06 | 2016-01-06 | 曾华平 | Nursing bed |
| CN106236282A (en) * | 2016-08-19 | 2016-12-21 | 桂林福冈新材料有限公司 | A kind of electric up-down tower crane |
| CN110307316A (en) * | 2019-07-28 | 2019-10-08 | 无锡市宏霸机电设备有限公司 | A kind of electric pushrod |
| CN110630223A (en) * | 2018-06-23 | 2019-12-31 | 上海樱洛机电科技有限公司 | Servo electric cylinder driven beam-pumping unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189451A (en) * | 2005-03-31 | 2008-05-28 | Thk株式会社 | Electric actuator |
| CN101471596A (en) * | 2007-12-28 | 2009-07-01 | 喜开理株式会社 | Electrical actuator |
| CN102155524A (en) * | 2009-12-14 | 2011-08-17 | 哈米尔顿森德斯特兰德公司 | Linear actuator with ball bearing spline |
| JP2012225444A (en) * | 2011-04-21 | 2012-11-15 | Ntn Corp | Linear motion guide mechanism |
| CN203504345U (en) * | 2013-10-24 | 2014-03-26 | 南京工艺装备制造有限公司 | Electric push rod |
-
2013
- 2013-10-24 CN CN201310505944.XA patent/CN103545978A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189451A (en) * | 2005-03-31 | 2008-05-28 | Thk株式会社 | Electric actuator |
| CN101471596A (en) * | 2007-12-28 | 2009-07-01 | 喜开理株式会社 | Electrical actuator |
| CN102155524A (en) * | 2009-12-14 | 2011-08-17 | 哈米尔顿森德斯特兰德公司 | Linear actuator with ball bearing spline |
| JP2012225444A (en) * | 2011-04-21 | 2012-11-15 | Ntn Corp | Linear motion guide mechanism |
| CN203504345U (en) * | 2013-10-24 | 2014-03-26 | 南京工艺装备制造有限公司 | Electric push rod |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105213127A (en) * | 2015-11-06 | 2016-01-06 | 曾华平 | Nursing bed |
| CN106236282A (en) * | 2016-08-19 | 2016-12-21 | 桂林福冈新材料有限公司 | A kind of electric up-down tower crane |
| CN110630223A (en) * | 2018-06-23 | 2019-12-31 | 上海樱洛机电科技有限公司 | Servo electric cylinder driven beam-pumping unit |
| CN110307316A (en) * | 2019-07-28 | 2019-10-08 | 无锡市宏霸机电设备有限公司 | A kind of electric pushrod |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140129 |