CN104052188A - Precise electric cylinder - Google Patents

Precise electric cylinder Download PDF

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Publication number
CN104052188A
CN104052188A CN201410313102.9A CN201410313102A CN104052188A CN 104052188 A CN104052188 A CN 104052188A CN 201410313102 A CN201410313102 A CN 201410313102A CN 104052188 A CN104052188 A CN 104052188A
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CN
China
Prior art keywords
lead screw
ball
screw shaft
cylinder
trunk
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.)
Pending
Application number
CN201410313102.9A
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Chinese (zh)
Inventor
李旻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Ao Rui Control System Co Ltd
Original Assignee
Shanghai Ao Rui Control System Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Ao Rui Control System Co Ltd filed Critical Shanghai Ao Rui Control System Co Ltd
Priority to CN201410313102.9A priority Critical patent/CN104052188A/en
Publication of CN104052188A publication Critical patent/CN104052188A/en
Pending legal-status Critical Current

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Abstract

A precise electric cylinder comprises a driving motor, a cylinder barrel, a lead screw pair, a thrust bearing, a hollow barrel-shaped piston rod and a ball spline sleeve, wherein the lead screw pair is composed of a lead screw shaft and a lead screw nut. The lead screw shaft is arranged along the central axis of the cylinder barrel, the power input end of the lead screw shaft is in transmission connection with an output shaft of the driving motor, the lead screw shaft is axially positioned through the thrust bearing, an outer ring of the thrust bearing and the cylinder barrel are fixed coaxially, the lead screw nut and the barrel-shaped piston rod are coaxially and fixedly connected, and the other end, opposite to the power input end, of the lead screw shaft stretches into the hollow barrel-shaped piston rod. When the driving motor drives the lead screw shaft to rotate and the piston rod is driven to conduct reciprocating motion, rolling of balls replaces original sliding friction between the piston rod and a supporting component and between the piston rod and a guiding component, so that abrasion is reduce, and efficiency, control accuracy and reliability are improved.

Description

Electric precise cylinder
Technical field
What the present invention relates to is that a kind of rotatablely moving is converted to straight-line electric linear actuator, and specifically a kind of piston rod obtains rolling support and the electric precise cylinder of the guiding of rolling simultaneously.
Background technology
Electric cylinder is to apply in recent years more and more general electric linear actuator, has energy-conservationly, and the plurality of advantages such as noise is little, pollution-free, and efficiency is high, and application layout is easy, has progressively substituted traditional hydraulic pressure and pneumatic wire actuator in a lot of applications.It is direct-connected that electric cylinder principle is that drive motors passes through, or driving belt and belt wheel, or gear pair drives lead screw shaft to rotate, and feed screw nut is fixedly connected with the trunk-piston bar of hollow, the rotation of lead screw shaft is converted into the rectilinear motion of feed screw nut and piston rod.For realizing above-mentioned rotatablely moving to straight-line conversion, must prevent the rotation of feed screw nut and piston rod, rotatablely moving of lead screw shaft could be changed into the straight reciprocating motion of feed screw nut and piston rod.The existing electric cylinder often groove by cylinder barrel inside, as the rotation that is slidably matched to prevent piston rod between gathering sill and piston rod projection, slide block or feather key, carrys out the reciprocating motion of sliding support piston rod by bush of bush bearing in cylinder barrel end.
Through the retrieval of prior art is found, Chinese patent literature CN201113645Y open (bulletin) day 2008.09.10, a kind of electric cylinder is disclosed, this electric cylinder has a gathering sill parallel with roller screw in housing 9, on push rod 6, be provided with one and coordinate directed projection 7 with this gathering sill, in this invention, thereby be that guide effect is played in the rotation that the slip in the gathering sill on housing 9 realizes anti-throw-out lever by the projection 7 on push rod 6; Chinese patent literature CN203339872U open (bulletin) day 2013.12.11, a kind of servo electric jar of tape relay slide block is disclosed, slide block 4 outer walls of transferring in this invention are provided with some slide blocks 41, corresponding each slide block 41, inboard wall of cylinder block is axially arranged with the identical chute that matches with it, slide block 41 slides axially in chute, thereby guide effect is played in the rotation of anti-throw-out lever.
Guide frame in above-mentioned technology all produces sliding friction, long-time use can produce wearing and tearing, thereby generation guiding clearance, cause the kinematic accuracy of system to reduce, heterodromous time, also have a backhaul gap, noise progressively becomes greatly, and intensity also can variation, and the dust that skimming wear produces can easily accelerate again the wearing and tearing of inner leading screw.
Chinese patent literature CN201466875U open (bulletin) day 2010.05.12, a kind of electromechanical actuator is disclosed, in this electromechanical actuator, start push rod 16 both sides adopt rolling bearing 19 and gathering sill as guiding mechanism, two rolling bearings 19 are distributed in the both sides of start push rod 16 afterbodys, bearing inner race is fixedly connected with start push rod 16, bearing outer ring rolls along gathering sill in cylinder body, prevents the rotation of start push rod 16; This electromechanical actuator also comprises an axle sleeve 17, is arranged between start push rod 16 and end cap 22, in the time that push rod does stretching motion, push rod is played to sliding support effect.Although the prior art adopts the guide frame of rolling bearing as start push rod, substitute the guidance mode of feather key and keyway, substituted slip by rolling in this link, but adopt axle sleeve to support push rod at push rod output, in the linear extendible reciprocating motion of push rod, this link remains sliding friction, especially actuator in actual use push rod often can bear certain radial load, the now friction meeting between effect Lower shaft sleeve and the push rod of radial load is sharply risen, wearing and tearing aggravation, the inner unsettled frictional force of actuator can make the position of push rod end simultaneously, the accurate control of speed and power becomes very difficulty.To sum up, due to all drawbacks that the sliding friction of the support component of existing electric cylinder guiding parts or piston rod output causes, limited electric cylinder and required the application high and occasion that life requirement is high in a lot of control precisions.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of electric precise cylinder is proposed, piston rod in this electric precise cylinder obtains roll guiding and rolling support simultaneously, not only eliminate the sliding friction between electric cylinder internal guide elements, also eliminated the sliding friction between piston rod and end support parts, reduce wearing and tearing, extended useful life, more improved control precision.
The present invention is achieved by the following technical solutions: the present invention includes: drive motors, cylinder barrel, the lead screw pair being formed by lead screw shaft and feed screw nut, thrust bearing, the trunk-piston bar of hollow and ball spline cover, wherein: lead screw shaft is arranged along the central axis of cylinder barrel, the power intake of lead screw shaft and the output shaft of drive motors are in transmission connection, lead screw shaft is by thrust bearing axial location, the outer ring of thrust bearing and cylinder barrel are coaxially fixing, feed screw nut is coaxially fixedly connected with trunk-piston bar, the other end of the relative power intake of lead screw shaft stretches in the trunk-piston bar of hollow.
Described ball spline cover is fixed on cylinder barrel end, ball spline cover inside includes some the symmetrical closed raceways that can make ball-recirculation roll, in closed raceway, be covered with ball, the corresponding external peripheral surface at trunk-piston bar is also distributed with the raceway rolling for ball of similar number vertically in whole length, with the trunk-piston bar of raceway and the ball composition ball spline pair of ball spline cover and inside thereof, trunk-piston bar is supported by spline housing by ball and utilizes the relative spline housing of rolling of ball to do linear reciprocal movement.Because spline housing is completely fixed in cylinder barrel end and cylinder barrel, the attribute of ball spline is restricted the rotation of trunk-piston bar, ball spline cover plays rolling support and rolling guide effect by ball to trunk-piston bar simultaneously like this, in the time that drive motors drives lead screw shaft rotation, the feed screw nut, nut seat and the trunk-piston bar that are fixed together can only do linear reciprocal movement vertically.
Described thrust bearing is made up of a pair of angular contact thrust bearing or taper roll bearing.
Described lead screw shaft and feed screw nut thereof are ball screw assembly, or roller screw pair.
Described drive motors is connected by Linear transmission or refraction-reflection type transmission with screw mechanism.
Described Linear transmission refers to: the output shaft of drive motors is connected with lead screw shaft by shaft coupling; Described refraction-reflection type transmission refers to: drive motors rotates by belt wheel belt or the moving lead screw shaft of meshing gear subband.
Described drive motors adopts but is not limited to servomotor, stepping motor, direct current machine or alternating current machine.
The raceway of described ball spline pair is symmetrical arranged, and is at least two groups.
The two ends of described ball spline cover are provided with sealing ring, are provided with at ball spline cover middle part the fatten groove and the oilhole that communicate with closed raceway.
The end of described trunk-piston bar is provided with the adapter for being connected with different connecting objects.
Technique effect
Compared with prior art, the present invention has following beneficial effect: a kind of electric precise cylinder with ball spline pair is provided, ball spline cover plays to piston rod roll guiding and rolling support effect by ball simultaneously, so just the sliding friction between guiding parts or between piston rod and end portion supports parts in prior art is all become to rolling friction, made the running of system become very smooth and easy.Eliminate skimming wear, extended useful life, reduced system noise, improved drive system efficiency, thereby improved the precision of Position Control, speed control and the power control of system, and then expanded the scope of application of electric cylinder.Even bear certain radial load at push rod, the service behaviour of electric cylinder also can be very stable.
Brief description of the drawings
Fig. 1 is the assembling schematic diagram of electric cylinder of the present invention;
In figure, omit drive motors.
Fig. 2 is the perspective view of the pair of ball spline described in the present invention;
Fig. 3 is drive motors and screw mechanism Linear transmission connection diagram;
Fig. 4 is drive motors and the screw mechanism refraction-reflection type schematic diagram that is in transmission connection;
In figure: 1 is that lead screw shaft, 2 is that guide screw lock jack panel, 3 is that bearing plate, 4 bearing pedestals, 5 are that thrust bearing, 6 is that cylinder barrel, 7 is that feed screw nut, 8 is that nut seat, 9 is that ball, 10 is that fuel filler neck, 11 is that ball spline cover, 12 is that sealing ring, 13 is that trunk-piston bar, 14 is that adapter locking nut, 15 is that adapter, 16 is that drive motors, 17 is that shaft coupling, 18 is that fixed head, 19 is that small pulley, 20 is that belt, 21 is large belt wheel.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the present embodiment comprises: cylinder barrel 6, the lead screw pair that lead screw shaft 1 and feed screw nut 7 form, thrust bearing 5 and bearing pedestal 4, trunk-piston bar 13, wherein: lead screw shaft 1 is arranged along the central axis of cylinder barrel 6, lead screw shaft 1 is through thrust bearing 5, fix with the inner ring of thrust bearing by the shaft shoulder and locking nut 2, the outer ring of thrust bearing 5 coordinates with bearing pedestal 4 endoporus, fixing with bearing pedestal 4 by bearing plate 3, so just lead screw shaft 1 is carried out to axial location, thrust bearing 5 is made up of a pair of thrust bearing, can be that a pair of angular contact thrust bearing can be also a pair of taper roll bearing, cylinder barrel 6 is fixedly connected with bearing pedestal 4, connection way can be both also can be in cylinder barrel 6 and bearing pedestal 4 matching part cutted threads by bolt, feed screw nut 7 is bolted to connection with nut seat 8, nut seat 8 is fixedly connected with by threaded engagement with trunk-piston bar 13, feed screw nut 7 is fixed together by nut seat 8 and trunk-piston bar 13 like this, the end of lead screw shaft 1 stretches in the trunk-piston bar 13 of hollow.This electric precise cylinder also comprises ball spline cover 11, and ball spline cover 11 is fixed on cylinder barrel 6 ends.
As shown in Figure 2, ball spline overlaps 11 inside the closed raceway that can make ball-recirculation roll, in closed raceway, be covered with ball 9, the external peripheral surface of trunk-piston bar 13 is distributed with the raceway rolling for ball in whole length vertically, trunk-piston bar 13 with raceway forms ball spline pair with the ball 9 of ball spline cover 11 and inside thereof, and trunk-piston bar 13 is supported by spline housing 11 by ball 9 and utilizes the relative spline housing of rolling of ball to do linear reciprocal movement.In figure, six groups of symmetrical raceways of the secondary employing of the ball spline of embodiment, have six symmetrical raceways on the outer circumference surface of trunk-piston bar 13, in ball spline cover 11, also have six corresponding closed raceways of symmetry.Raceway number can have different designs, but at least will have two groups of symmetrical raceways.Overlapping 11 middle parts at ball spline has fatten groove and oilhole to communicate with closed raceway, and the correspondence position on cylinder barrel has oilhole, and fuel filler neck 10 is housed on oilhole, can give ball spline the secondary lubricating grease that adds by fuel filler neck 10; For preventing that dust and pollutant from entering ball spline pair and preventing that in closed raceway, grease is excessive, is equipped with sealing ring 12 at the two ends of ball spline cover 11.
As shown in Figure 1, ball spline cover 11 is completely fixed in cylinder barrel 6 ends and cylinder barrel 6, the attribute of ball spline is restricted the rotation of trunk-piston bar 13, so 11 pairs of trunk-piston bars 13 of ball spline cover play rolling support and rolling guide effect simultaneously, in the time that drive motors 16 drives lead screw shaft 1 to rotate, the feed screw nut 7 being fixed together, nut seat 8 and trunk-piston bar 13 can only do linear reciprocal movement vertically.
What in Fig. 1 embodiment, adopt is ball screw assembly,, also can replace to roller screw pair, to meet the use occasion of very big thrust.
As shown in Figure 3, described drive motors 16 can arrange by coaxial line with lead screw shaft 1, and the power intake of lead screw shaft 1 and drive motors 16 output shafts are in transmission connection by shaft coupling 17.
As shown in Figure 4, described drive motors 16 can also be arranged by refraction-reflection type with lead screw shaft 1, comprise: small pulley 19 on the fixed head 18 being fixedly connected with cylinder barrel 6 with drive motors 16 respectively, the output shaft that is fixedly installed on drive motors 16, be fixedly installed on the large belt wheel 21 of the power intake of lead screw shaft 1, and being arranged at the belt 20 for transferring power between two belt wheels, drive motors 16 rotates by belt wheel and belt drives lead screw shaft 1.Under this refraction-reflection type arrangement, belt wheel belt can also be replaced with to the gear pair of pair of meshing, drive motors 16 is driven to lead screw shaft 1 and is rotated by the engagement of gear.
For meeting the connection requirement of trunk-piston bar 13 outputs and different target, as shown in Figure 1, at trunk-piston bar 13 ends, adapter 15 is housed, trunk-piston bar 13 is threaded connection with adapter 15, and fastening through locking nut 14.According to the multiple different adapter 15 of actual and outside connection design, in the face of needing only, different connecting objects changes adapter 15.
Drive motors 16, according to the different application occasion of electric cylinder, can be selected dissimilar motor, preferentially selects servomotor to controlling the high occasion of quality requirements, and general occasion can be selected stepping motor, common DC motor, alternating current machine etc.

Claims (9)

1. an electric precise cylinder, it is characterized in that, comprise: trunk-piston bar and the ball spline cover of drive motors, cylinder barrel, the lead screw pair being formed by lead screw shaft and feed screw nut, thrust bearing, hollow, wherein: lead screw shaft is arranged along the central axis of cylinder barrel, the power intake of lead screw shaft and the output shaft of drive motors are in transmission connection, lead screw shaft is by thrust bearing axial location, the outer ring of thrust bearing and cylinder barrel are coaxially fixing, feed screw nut is coaxially fixedly connected with trunk-piston bar, and the other end of the relative power intake of lead screw shaft stretches in the trunk-piston bar of hollow;
Described ball spline cover is fixed on cylinder barrel end, ball spline cover inside is arranged with some the closed raceways that roll for ball-recirculation, in closed raceway, be covered with ball, the corresponding raceway that is provided with similar number on the external peripheral surface of trunk-piston bar, with the trunk-piston bar of raceway and the ball composition ball spline pair of ball spline cover and inside thereof, trunk-piston bar is supported by spline housing by ball and utilizes the relative spline housing of rolling of ball to do linear reciprocal movement.
2. electric precise cylinder according to claim 1, is characterized in that, described thrust bearing is made up of a pair of angular contact thrust bearing or taper roll bearing.
3. electric precise cylinder according to claim 1, is characterized in that, described lead screw shaft and feed screw nut thereof are ball screw assembly, or roller screw pair.
4. electric precise cylinder according to claim 1, is characterized in that, described drive motors is connected by Linear transmission or refraction-reflection type transmission with screw mechanism.
5. electric precise cylinder according to claim 4, is characterized in that, described Linear transmission refers to: the output shaft of drive motors is connected with lead screw shaft by shaft coupling; Described refraction-reflection type transmission refers to: drive motors rotates by belt wheel belt or the moving lead screw shaft of meshing gear subband.
6. according to the electric precise cylinder described in claim 1 or 4 or 5, it is characterized in that, described drive motors adopts servomotor, stepping motor, direct current machine or alternating current machine.
7. electric precise cylinder according to claim 1, is characterized in that, the raceway of described ball spline pair is symmetrical arranged, and is at least two groups.
8. electric precise cylinder according to claim 1, is characterized in that, the two ends of described ball spline cover are provided with sealing ring, is provided with at ball spline cover middle part the fatten groove and the oilhole that communicate with closed raceway.
9. electric precise cylinder according to claim 1, is characterized in that, the end of described trunk-piston bar is provided with the adapter for being connected with different connecting objects.
CN201410313102.9A 2014-07-02 2014-07-02 Precise electric cylinder Pending CN104052188A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410313102.9A CN104052188A (en) 2014-07-02 2014-07-02 Precise electric cylinder

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Application Number Priority Date Filing Date Title
CN201410313102.9A CN104052188A (en) 2014-07-02 2014-07-02 Precise electric cylinder

Publications (1)

Publication Number Publication Date
CN104052188A true CN104052188A (en) 2014-09-17

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105356653A (en) * 2015-11-16 2016-02-24 宜兴市融兴铸造有限公司 Vacuum electric cylinder
CN106623920A (en) * 2016-10-26 2017-05-10 厦门理工学院 Precise compact type 3D printer powder supply mechanism and transmission method
CN107377733A (en) * 2017-09-15 2017-11-24 湘潭大学 Light-alloy pipe fitting inflatable thermal formation apparatus and forming method based on electromagnetic pulse
CN108777528A (en) * 2018-06-26 2018-11-09 苏州舍勒智能科技有限公司 A kind of split type servo electric jar
CN108895131A (en) * 2018-08-02 2018-11-27 河北三益科技有限公司 A kind of electric cylinder of adaptive location limit function
CN109738274A (en) * 2019-01-22 2019-05-10 南京航空航天大学 Fibre reinforced composites microscopic test loading device
CN110848203A (en) * 2019-11-26 2020-02-28 衡阳市林肯液压设备有限公司 Guide sleeve for hydraulic cylinder
CN110925374A (en) * 2019-12-04 2020-03-27 广州亨龙智能装备股份有限公司 Electric cylinder and power equipment
CN112524167A (en) * 2020-12-22 2021-03-19 泰尔重工股份有限公司 Drum-shaped gear coupling with axial large-expansion function

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Publication number Priority date Publication date Assignee Title
JPH09144831A (en) * 1995-11-17 1997-06-03 Honda Motor Co Ltd Direct acting actuator
JPH11303966A (en) * 1998-04-15 1999-11-02 Thk Co Ltd Electrically-driven cylinder device and its manufacture
US20110138949A1 (en) * 2009-12-14 2011-06-16 Hamilton Sundstrand Corporation Linear Actuator with Ball Bearing Spline
CN102341620A (en) * 2009-03-31 2012-02-01 Thk株式会社 Ball-screw spline
CN203339874U (en) * 2013-07-24 2013-12-11 苏州库比克机器人有限公司 Servo electric cylinder of high concentricity and transmission accuracy
CN103703279A (en) * 2012-08-01 2014-04-02 日本精工株式会社 Linear motion device
CN203967898U (en) * 2014-07-02 2014-11-26 上海翱锐控制系统有限公司 Electric precise cylinder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09144831A (en) * 1995-11-17 1997-06-03 Honda Motor Co Ltd Direct acting actuator
JPH11303966A (en) * 1998-04-15 1999-11-02 Thk Co Ltd Electrically-driven cylinder device and its manufacture
CN102341620A (en) * 2009-03-31 2012-02-01 Thk株式会社 Ball-screw spline
US20110138949A1 (en) * 2009-12-14 2011-06-16 Hamilton Sundstrand Corporation Linear Actuator with Ball Bearing Spline
CN103703279A (en) * 2012-08-01 2014-04-02 日本精工株式会社 Linear motion device
CN203339874U (en) * 2013-07-24 2013-12-11 苏州库比克机器人有限公司 Servo electric cylinder of high concentricity and transmission accuracy
CN203967898U (en) * 2014-07-02 2014-11-26 上海翱锐控制系统有限公司 Electric precise cylinder

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105356653A (en) * 2015-11-16 2016-02-24 宜兴市融兴铸造有限公司 Vacuum electric cylinder
CN105356653B (en) * 2015-11-16 2017-10-24 宜兴市融兴铸造有限公司 Vacuum electric cylinder
CN106623920A (en) * 2016-10-26 2017-05-10 厦门理工学院 Precise compact type 3D printer powder supply mechanism and transmission method
CN106623920B (en) * 2016-10-26 2019-08-13 厦门理工学院 A kind of the compact 3D printer powder supplying mechanism and drive method of precision
CN107377733A (en) * 2017-09-15 2017-11-24 湘潭大学 Light-alloy pipe fitting inflatable thermal formation apparatus and forming method based on electromagnetic pulse
CN108777528A (en) * 2018-06-26 2018-11-09 苏州舍勒智能科技有限公司 A kind of split type servo electric jar
CN108895131A (en) * 2018-08-02 2018-11-27 河北三益科技有限公司 A kind of electric cylinder of adaptive location limit function
CN109738274A (en) * 2019-01-22 2019-05-10 南京航空航天大学 Fibre reinforced composites microscopic test loading device
CN110848203A (en) * 2019-11-26 2020-02-28 衡阳市林肯液压设备有限公司 Guide sleeve for hydraulic cylinder
CN110925374A (en) * 2019-12-04 2020-03-27 广州亨龙智能装备股份有限公司 Electric cylinder and power equipment
CN112524167A (en) * 2020-12-22 2021-03-19 泰尔重工股份有限公司 Drum-shaped gear coupling with axial large-expansion function
CN112524167B (en) * 2020-12-22 2021-10-15 泰尔重工股份有限公司 Drum-shaped gear coupling with axial large-expansion function

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Application publication date: 20140917