CN203504345U - Electric push rod - Google Patents
Electric push rod Download PDFInfo
- Publication number
- CN203504345U CN203504345U CN201320659008.XU CN201320659008U CN203504345U CN 203504345 U CN203504345 U CN 203504345U CN 201320659008 U CN201320659008 U CN 201320659008U CN 203504345 U CN203504345 U CN 203504345U
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- CN
- China
- Prior art keywords
- ball
- push rod
- ball nut
- housing
- nut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model relates to the push rod field, especially to an electric push rod with a ball spline. The electric push rod consists of a housing, a push rod element, a ball screw, a ball nut, a coupler and a servo motor. The ball nut and the ball screw are connected threadedly and are arranged in the housing; the servo motor is connected with the ball screw in a driving mode by a coupler; and the push rod element is plugged into one end of the housing and is connected with the ball nut. A plurality of groups of raceways are arranged at the ball nut and the inner wall of the housing; balls are arranged inside the raceways; and the raceways and the balls form a ball spline. According to the utility model, the ball nut and the ball screw only bear the pure tensile force or the pure pressure, thereby prolonging the service life of the ball screw assembly.
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.
As shown in Figure 1, servomotor 12 drives ball-screw to turn 5 by shaft coupling 11 and moves traditional electric pushrod structure, 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 |
|---|---|---|---|
| CN201320659008.XU CN203504345U (en) | 2013-10-24 | 2013-10-24 | Electric push rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320659008.XU CN203504345U (en) | 2013-10-24 | 2013-10-24 | Electric push rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203504345U true CN203504345U (en) | 2014-03-26 |
Family
ID=50335289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320659008.XU Expired - Lifetime CN203504345U (en) | 2013-10-24 | 2013-10-24 | Electric push rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203504345U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545978A (en) * | 2013-10-24 | 2014-01-29 | 南京工艺装备制造有限公司 | Electric pushing rod |
| CN103883694A (en) * | 2014-04-05 | 2014-06-25 | 支敏之 | Minitype spiral transmission device |
| CN103994191A (en) * | 2014-05-12 | 2014-08-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Transition mechanism of energy drive |
| CN106979295A (en) * | 2017-05-15 | 2017-07-25 | 江苏启尖丝杠制造有限公司 | Force booster type ball screw assembly, positions pusher |
| CN112769283A (en) * | 2020-12-31 | 2021-05-07 | 无锡灵德自动化科技有限公司 | Integrated electric actuator |
-
2013
- 2013-10-24 CN CN201320659008.XU patent/CN203504345U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545978A (en) * | 2013-10-24 | 2014-01-29 | 南京工艺装备制造有限公司 | Electric pushing rod |
| CN103883694A (en) * | 2014-04-05 | 2014-06-25 | 支敏之 | Minitype spiral transmission device |
| CN103994191A (en) * | 2014-05-12 | 2014-08-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Transition mechanism of energy drive |
| CN106979295A (en) * | 2017-05-15 | 2017-07-25 | 江苏启尖丝杠制造有限公司 | Force booster type ball screw assembly, positions pusher |
| CN112769283A (en) * | 2020-12-31 | 2021-05-07 | 无锡灵德自动化科技有限公司 | Integrated electric actuator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140326 |