CN107314090A - It is a kind of can bidirectional self-locking electric pushrod - Google Patents
It is a kind of can bidirectional self-locking electric pushrod Download PDFInfo
- Publication number
- CN107314090A CN107314090A CN201710536373.4A CN201710536373A CN107314090A CN 107314090 A CN107314090 A CN 107314090A CN 201710536373 A CN201710536373 A CN 201710536373A CN 107314090 A CN107314090 A CN 107314090A
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- China
- Prior art keywords
- electric pushrod
- self
- locking
- outer tube
- friction plate
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H25/2454—Brakes; Rotational locks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
Abstract
The invention discloses it is a kind of can bidirectional self-locking electric pushrod, belong to Linear transmission technical field, including outer tube, inner tube, drive lead screw and transmission nut, the drive lead screw is rotatably installed in outer tube, the transmission nut is fixedly connected with inner tube, the electric pushrod is provided with self-locking device, the self-locking device includes left shaft holder, right axle bearing and it is located between left shaft holder and right axle bearing and is used to be adjacent to the brake disc of left shaft holder or right axle bearing, the left shaft holder, right axle bearing is arranged on outer tube, the brake disc is fixedly mounted on drive lead screw, the periphery of the brake disc is arranged with self-locking torsion spring, the periphery of the self-locking torsion spring and left shaft holder, the periphery of right axle bearing, the periphery of brake disc is interference fitted.The advantage of the invention is that bidirectional self-locking can be realized, and it is simple in construction, self-locking is stable.
Description
【Technical field】
The present invention relates to it is a kind of can bidirectional self-locking electric pushrod, belong to Linear transmission technical field.
【Background technology】
Electric pushrod, is typically also linear actuators, and its main operational principle is to drive drive lead screw to rotate by motor,
Transmission nut is set on drive lead screw, drives nut to move back and forth when drive lead screw is rotated, is usually provided with electric pushrod certainly
Locking device, to avoid motor rear electric pushrod out of service from being slided when being acted on by external force, causes electric pushrod to lose
Phenomenon is locked, existing electric pushrod self-locking structure uses torsion spring mode to realize substantially, its cardinal principle is to utilize drive lead screw reversion
When torsion spring can hold drive lead screw tightly, so as to realize braking, but the self-locking device on existing electric pushrod, can only solely realize
In the stretching direction self-locking of push rod, or retraction direction self-locking, but same push rod is but difficult to have while two sides can be realized
To self-locking, even have, structure is also more complicated, and cost is higher.
【The content of the invention】
The technical problems to be solved by the invention be to overcome the deficiencies in the prior art and provide it is a kind of can bidirectional self-locking
Electric pushrod, can realize bidirectional self-locking, and simple in construction, and self-locking is stable.
Above-mentioned technical problem is solved, the present invention is adopted the following technical scheme that：
It is a kind of can bidirectional self-locking electric pushrod, including outer tube, inner tube, drive lead screw and transmission nut, the driving wire
Bar is rotatably installed in outer tube, and the transmission nut is fixedly connected with inner tube, and the electric pushrod is provided with self-locking device, described
Self-locking device includes left shaft holder, right axle bearing and is located between left shaft holder and right axle bearing to be used to be adjacent to left shaft holder or the right side
The brake disc of bearing block, the left shaft holder, right axle bearing are arranged on outer tube, and the brake disc is fixedly mounted on drive lead screw
On, the periphery of the brake disc is arranged with self-locking torsion spring, the periphery of the self-locking torsion spring and left shaft holder, right axle bearing it is outer
Week, the periphery of brake disc are interference fitted.
Using beneficial effects of the present invention：
In the present invention, self-locking device mainly includes brake disc, left shaft holder, right axle bearing, wherein self-locking torsion spring, left bearing
Seat and right axle bearing are respectively provided at the not homonymy of brake disc, and self-locking torsion spring is while being set in brake disc, left shaft holder, right bearing
Seat periphery, and is interference fitted simultaneously with this three, drive lead screw in stretching or retraction can by different directions axial force, this
Axial force energy driving brake disk is adjacent to left shaft holder or right axle bearing, and when motor is up, self-locking torsion spring is to be in
Releasing orientation, even if therefore be to be close to state between brake disc and left shaft holder or right axle bearing, system will not be also produced between the two
Power, and when under motor halted state, drive lead screw is to be in passive running status, self-locking torsion spring is to screw shape under this state
State, can clamp left shaft holder or right axle bearing, regardless of whether now drive lead screw is when stretching out or during retraction, brake disc it is inevitable with
One of left shaft holder, right axle bearing are close to, such left shaft holder and right axle bearing, and one of them will necessarily be folded to brake
To braking action, for whole electric pushrod, i.e., either push rod is in the state of stretching, or retracted state, as long as motor
When out of service, the self-locking device of electric pushrod can be triggered, so that electric pushrod possesses the ability of bidirectional self-locking.
In addition, in the present invention, parts cost is less, especially self-locking torsion spring, only with one, and assembling
It is more convenient, it is only necessary to which that left shaft holder, right axle bearing are inserted into same self-locking torsion spring, it is overall to be fitted into outer tube, and allow
Outer tube completes axially position to left shaft holder, right axle bearing.
Preferably, the self-locking torsion spring is identical with the rotation direction of drive lead screw.
Preferably, being provided with left bearing between left shaft holder and brake disc, right axle is provided between right axle bearing and brake disc
Hold.
Preferably, left fixed plate and right fixed plate are fixed with the outer tube, the left fixed plate and right fixed plate
It is located at the different both sides of brake disc respectively, left friction plate, right fixed plate and the right side is provided between left fixed plate and the left shaft holder
Right friction plate is provided between bearing block.
Preferably, the left friction plate includes the first friction plate and the second friction plate, the first friction plate is fixedly mounted on
In left fixed plate, the second friction plate is fixedly mounted on left shaft holder, and left pad is provided between the first friction plate and the second friction plate
Block.
Preferably, the right friction plate includes the 3rd friction plate and the 4th friction plate, the 3rd friction plate is arranged on right solid
In fixed board, the 4th friction plate is fixedly mounted in right axle bearing, and right cushion block is provided between the 3rd friction plate and the 4th friction plate.
Fixed seat is installed preferably, being provided with the outer tube in positioning step, the outer tube, the left fixed plate,
Right fixed plate is positioned between positioning step and fixed seat.
Preferably, the fixed seat includes seat body and is located at the intrinsic adjusting nut of seat, the left fixed plate and
Right fixed plate is positioned between adjusting nut and positioning step.
Preferably, the fixed seat is connected through a screw thread with the outer tube, the outer tube is provided with the locking fixation
The fastening screw nut of seat.
Preferably, the inwall of the left fixed plate and outer tube, one of them is provided with the first positioning bar, and another is provided with
The first locating slot matched with first positioning bar；And/or, the inwall of the right fixed plate and outer tube, one of them is provided with
Second positioning bar, another is provided with the second locating slot matched with the second positioning bar.
The other features and advantages of the invention will be detailed in following embodiment, accompanying drawing exposure.
【Brief description of the drawings】
The present invention is described further below in conjunction with the accompanying drawings：
Fig. 1 is the exploded perspective view of electric pushrod embodiment one of the present invention；
Fig. 2 is the schematic cross-sectional view one of electric pushrod embodiment one of the present invention；
Fig. 3 is the schematic cross-sectional view two of electric pushrod embodiment one of the present invention；
Fig. 4 is the schematic cross-section of fixed plate and outer tube in electric pushrod embodiment one of the present invention；
Fig. 5 is the exploded perspective view of multilayer proofing structure in electric pushrod embodiment one of the present invention；
Fig. 6 is the schematic cross-sectional view of multilayer proofing structure in electric pushrod embodiment one of the present invention；
Fig. 7 is the schematic cross-section of cable in electric pushrod embodiment one of the present invention.
【Embodiment】
The technical scheme of the embodiment of the present invention is explained and illustrated with reference to the accompanying drawing of the embodiment of the present invention, but under
Embodiment only the preferred embodiments of the present invention are stated, and it is not all.Based on the embodiment in embodiment, those skilled in the art
Other embodiment is obtained on the premise of creative work is not made, protection scope of the present invention is belonged to.
In the following description, occur the indicating position such as term " interior ", " outer ", " on ", " under ", "left", "right" or
Position relationship is that, based on orientation shown in the drawings or position relationship, description embodiment merely for convenience is described with simplified, and
It is not instruction or implies that signified device or element there must be specific orientation, with specific azimuth configuration and operation, because
This is not considered as limiting the invention.
Embodiment 1：
As shown in Figures 1 to 4, the present embodiment displaying it is a kind of can bidirectional self-locking electric pushrod, the present embodiment is mainly excellent
Be selected in solar energy thermal-power-generating technology, driving heliostat is used, naturally it is also possible to for other pairs can bidirectional self-locking electricity
In the higher field of dynamic push rod precision, in the present embodiment can bidirectional self-locking electric pushrod, its primary structure includes motor, electricity
Machine is connected with drive lead screw 1, drive lead screw 1 and is connected with transmission nut 2, and motor is mounted in pedestal, and pedestal is fixed
Outer tube 11 is connected with, and transmission nut 2 is then fixedly connected with inner tube 21, when motor drives drive lead screw 1 to rotate, transmission nut
2 relatively move with drive lead screw 1.For generally speaking, being to realize inner tube 21 to relatively move with outer tube 11, inner tube
21 outermost end is then used to drive heliostat to rotate.
Electric pushrod in the present embodiment is provided with self-locking device, and the self-locking device includes left shaft holder 31, right bearing
Seat 32, brake disc 12 and self-locking torsion spring 13, brake disc 12 are fixed and are located on drive lead screw 1, and positioned at left shaft holder 31 and right axle
Between bearing 32, from shown in Fig. 1 and Fig. 2, left shaft holder 31 and right axle bearing 32 are positioned at the different both sides of brake disc 12, brake disc
12 are used to be adjacent to left shaft holder 31 or right axle bearing 32, the left bearing in axial force of the drive lead screw 1 by different directions
Seat 31, right axle bearing 32 are axially located on outer tube 11, and the periphery of the brake disc 12 is arranged with self-locking torsion spring 13, institute
State self-locking torsion spring 13 and the periphery of the periphery, the periphery of right axle bearing 32, brake disc 12 of left shaft holder 31 is interference fitted.
Drive lead screw 1 in stretching or retraction can by different directions axial force, the axial force energy driving brake disk 12
It is adjacent to left shaft holder 31 or right axle bearing 32, when motor is up, self-locking torsion spring 13 is to be in releasing orientation, therefore is stopped
Even if being to be close to state between hull 12 and left shaft holder 31 or right axle bearing 32, brake force will not be also produced between the two, and
When under motor halted state, drive lead screw 1 is that self-locking torsion spring 13 is tightening state, meeting under passive running status, this state
Left shaft holder 31 or right axle bearing 32 are clamped, regardless of whether now drive lead screw 1 is when stretching out or the when of retraction, brake disc 12 is inevitable
It is close to one of left shaft holder 31, right axle bearing 32, such left shaft holder 31 and right axle bearing 32, one of them will necessarily
Braking action is played to brake disc 12, for whole electric pushrod, i.e., either push rod stretch out state, or retraction shape
State, as long as motor is out of service, the self-locking device of electric pushrod can be triggered so that electric pushrod possess it is two-way from
The ability of lock.
In addition, in the present embodiment, parts cost is less, especially self-locking torsion spring 13, only with one, and group
Dress is also more convenient, it is only necessary to which left shaft holder 31, right axle bearing 32 are inserted into same self-locking torsion spring 13, overall to load outer
In pipe 11, and outer tube 11 is allowed to complete axially position to left shaft holder 31, right axle bearing 32.
Concrete structure：
The attachment structure of brake disc 12 and drive lead screw 1：As shown in figure 1, cross-perforating 101 is provided with drive lead screw 1,
Shown brake disc 12 is set on drive lead screw 1, and is fixed on using a latch 14 on drive lead screw 1, same with drive lead screw 1
Step is rotated.
Left shaft holder 31：It is arranged with towards the end face of brake disc 12 in left bearing groove, left bearing groove and left bearing is installed
33, left bearing 33 is located between left shaft holder 31 and brake disc 12, and left shaft holder 31 and drive lead screw 1 can be reduced after setting bearing
Between friction, while can also undertake a part of axial force；End face radial convex of the left shaft holder 31 away from brake disc 12 is provided with
Spacing ring, the self-locking torsion spring 13 is set in the periphery of left shaft holder 31 and to be limited ring spacing.
Right axle bearing 32：It is to be symmetrical arranged with left shaft holder 31, structure is consistent, does not make excessive elaboration.
In the present embodiment, left fixed plate 41 and right fixed plate 42, the left fixed plate 41 are fixed with the outer tube 11
It is located at the different both sides of brake disc 12 respectively with right fixed plate 42, is rubbed between left fixed plate 41 and the left shaft holder 31 provided with a left side
Pad, sets left friction plate, enables to brake force more to balance, on the other hand, because left shaft holder 31 is by larger braking
Under power effect, certain relative rotation occurs between meeting and left fixed plate 41, sets left friction plate effectively to reduce left bearing
Friction between seat 31 and left fixed plate 41.
Preferably, the left friction plate includes the first friction plate 51 and the second friction plate 52, the first friction plate 51
It is fixedly mounted in left fixed plate 41, the second friction plate 52 is fixedly mounted on left shaft holder 31, the first friction plate 51 and second
Left cushion block 55 is provided between friction plate 52, so designs, primary friction part is concentrated on left cushion block 55, other parts are almost
It is unaffected.
The fixed form of first friction plate 51 and left fixed plate 41：Multiple mounting holes 411 are provided with left fixed plate 41, the
It is correspondingly arranged on one friction plate 51 in two folding ears 511, the folding correspondence insertion mounting hole 411 of ear 511, to prevent the first friction plate
51 relatively rotate with left fixed plate 41；
The fixed form of second friction plate 52 and left shaft holder 31：Indent is provided with a left side on the end face of the left shaft holder 31
Flat position groove 311, the location and installation of the second friction plate 52 in left flat position groove 311, realize it is circumferentially positioned, to prevent the second friction plate 52
Relatively rotated with left shaft holder 31.
Above-mentioned left fixed plate 41, the first friction plate 51, left cushion block 55, the second friction plate 52, left shaft holder 31, left bearing
33 are set on drive lead screw 1 in the present embodiment, wherein left fixed plate 41 is also set with by a left positioning of positioning sleeve 61
On drive lead screw 1, to reduce friction.
Left fixed plate 41 is relatively-stationary with the holding of outer tube 11 circumferential direction, and specific positioning method can be found in Fig. 4, institute
The inwall of left fixed plate 41 and outer tube 11 is stated, one of them is provided with the first positioning bar 111, another is provided with determines with described first
The periphery of left fixed plate 41 is provided with multiple first locating slots 412 in the first locating slot 412 that position muscle 111 is matched, the present embodiment, and
Corresponding first positioning bar 111 in multiple positions is circumferentially with the inwall of outer tube 11, left fixed plate 41 passes through this structure positioning
In outer tube 11.
For：Right fixed plate 42, right axle bearing 32, and the right friction being located between right fixed plate 42 and right axle bearing 32
Piece；Right friction plate includes the 3rd friction plate 53 and the 4th friction plate 54；The right side between 3rd friction plate 53 and the 4th friction plate 54
Cushion block 56；The right grade of positioning sleeve 62 is the symmetrical structure with the left side parts of brake disc 12, does not make excessive elaboration.
The concrete principle of the present embodiment：
The rotation direction of drive lead screw 1 is identical with the rotation direction of self-locking torsion spring 13 in the present embodiment, when drive lead screw 1 drives in motor
Under when rotating clockwise, brake disc 12 overcomes the frictional force of self-locking torsion spring 13 to be rotated, and electric pushrod is in normal retraction shape
State, the axial force that now drive lead screw 1 is subject to is towards A directions in Fig. 2, although brake disc 12 now and the phase of left shaft holder 31
Support, but self-locking torsion spring 13 now is releasing orientation, so under state, the meeting of left shaft holder 31 and the synchronous axial system of brake disc 12,
Do not produce brake force.
And when motor stops, drive lead screw 1 is to be in passive state, under this state, the axial force that drive lead screw 1 is subject to
A directions in Fig. 2 are remained as, but now self-locking torsion spring 13 is to be in tightening state, can hold left shaft holder 31, left shaft holder 31 tightly
It is close to brake disc 12, therefore produces larger frictional force between the two, realizes braking effect；Simultaneously because with individual from lock knob
Spring 13, right axle bearing 32 can also be held tightly, now right friction plate, i.e. the 3rd friction plate 53 and the 4th friction plate 54 and right cushion block 56
Between frictional force can also play brake assisting effect.
Similarly, when drive lead screw 1 is rotated counterclockwise under motor induced effect, electric pushrod is in stretching state, this
When the axial force that is subject to of drive lead screw 1 towards the B directions in Fig. 2, now brake disc 12 offsets with right axle bearing 32, but does not produce
Raw brake force.
When motor stops, self-locking torsion spring 13 is in tightening state, can hold right axle bearing 32 tightly, right axle bearing 32, which is adjacent to, stops
Hull 12, to play braking action, and self-locking torsion spring 13 can hold on left shaft holder 31, left shaft holder 31 tightly on the left side simultaneously
Frictional force between one friction plate 51 and the second friction plate 52 and left cushion block 55 can also play a part of auxiliary braking.
Due to the brake force size in the present embodiment, left shaft holder 31, right axle bearing 32 are heavily dependent on stopping
Axial gap between hull 12, at the same the distance between the first friction plate 51 and the second friction plate 52, the 3rd friction plate 53 with
The distance between 4th friction plate 54 also affects overall brake force to a certain extent, in order to make brake force more accurate, or
Person is more controllable, and the present embodiment is provided with corresponding adjustment structure.
First, it is provided with the present embodiment, in the outer tube 11 in positioning step 112, the outer tube 11 and fixed seat is installed
7, the left fixed plate 41, right fixed plate 42 are positioned between positioning step 112 and fixed seat 7, the position of positioning step 112
It is changeless, and is by the way of being threadedly coupled with outer tube 11, in the outer wall of outer tube 11 in fixed seat 7, the present embodiment
Upper setting external screw thread, fixed seat 7 is arranged on external screw thread, and such axial location of itself of fixed seat 7 is also adjustable, using can
The characteristic of tune, just can adjust the axial location of right fixed plate 42.It is described outer in order to avoid the position of fixed seat 7 occurs to loosen change
Pipe 11 is provided with the fastening screw nut 71 for locking the fixed seat 7.
Secondly, also have inside fixed seat 7 in corresponding adjustable design, the present embodiment, fixed seat 7 includes seat body, seat body
Internal thread is internally provided with, two adjusting nuts 72 are set on its internal thread, and the axial location of right fixed plate 42 can pass through
The two adjusting nuts 72 are adjusted.
In addition, the electric pushrod of the present embodiment is also provided with multilayer proofing, to improve sealing property, referring specifically to Fig. 5 extremely
Guide pin bushing 81 is installed, provided with the first sealing scraping blade between the guide pin bushing 81 and inner tube 21 on Fig. 7, outer tube 11 described in the present embodiment
91, the guide pin bushing 81 is provided with the second dust guard 92, and the second dust guard 92 is located at the axially inner side of the first sealing scraping blade 91, described
Fixed cover 82 is installed, the fixed cover 82 is enclosed on outside inner tube 21, between the fixed cover 82 and said inner tube 21 in outer tube 11
The 3rd sealing ring 93 provided with waterproof, the 3rd sealing ring 93 is located at the axially inner side of the second dust guard 92.
In the present embodiment, electric pushrod is provided with multilayer proofing structure, and first layer is the first sealing scraping blade 91, is pushed away when electronic
When bar uses in outdoor environment, some foreign matters are easily adhered on the outer surface of inner tube 21, the first sealing scraping blade 91 is then used to scrape off
It is attached to the foreign matter on the outer surface of inner tube 21；The second layer is the second dust guard 92, and the second dust guard 92 is located at inner tube 21 and guide pin bushing
Between 81, due to being not to be fully sealed between the first sealing scraping blade 91 and inner tube 21, there are some fine particles or dust etc. also
It is to enter easily by the gap of the first sealing scraping blade 91 and the outer surface of inner tube 21, and the second dust guard 92 is exactly to be used to stop this
Partial little particle or dust enter inside electronic promotion；Third layer is the 3rd sealing ring 93 of waterproof, the second dust guard 92
Dustproof effect is mainly played, between the outer surface of inner tube 21 or based on rigidity cooperation, rigidity referred herein, which coordinates, is
Refer to that elastic deformation amount is less to be coordinated, include the cooperation of working of plastics and metalwork, and the 3rd sealing ring 93 and the appearance of inner tube 21
It is the flexible mode coordinated between face, can prevents the water being attached in inner tube 21 from entering in electric pushrod.
In the present embodiment, three-layer protection is set, sealing, stability are more preferable, even if wherein protecting generation problem together, its
The sealing of whole electric pushrod, will not cause sealing entirely ineffective under his a few road protection can also be alleviated to a certain extent.
The concrete structure of multilayer proofing structure：
As shown in fig. 6, in the present embodiment, the end of the outer tube 11 is provided with mounting seat 15, and mounting seat 15 passes through screw thread
Adapter sleeve is on outer tube 11, and the outer tube 11 is provided with limited step 113, and fixed cover 82, guide pin bushing 81 are overall to be positioned in limit
Between position step 113 and the end face of mounting seat 15, the periphery of guide pin bushing 81 is convexly equipped with locating ring, and the locating ring is positioned at installation
Between 15 end face of seat and the end face of outer tube 11.In order to prevent fixed cover 82 from being relatively rotated with outer tube 11, fixed cover 82
Outer peripheral face is provided with detent 821, and the inwall of the outer tube 11 is provided with the positioning convex tendon matched with detent 821, this
Positioning convex tendon and the first positioning bar are same in embodiment.
The second dust guard 92 is also improved in the present embodiment, specifically, second dust guard 92 includes first
The guard ring 9202 of guard ring 9201 and second, the first guard ring 9201 and the second guard ring 9202 are preferably to possess certain lubricity
Moulding, between the first guard ring 9201 and the second guard ring 9202 be provided with packing ring 9203, set Double-protection circle, equivalent to
Individual layer dustproof construction is changed to double-deck dustproof construction, wherein during one layer of failure, another layer can also continue to realize dust-proof effect.
The first installation has been recessed on the installation of second dust guard 92 for convenience, the inner side end of the guide pin bushing 81
Groove, first guard ring 9201, the second guard ring 9202 be positioned in the first mounting groove and the fixed cover 82 end face it
Between, so that the first guard ring 9201 and the second guard ring 9202 are axially located.It should be noted that anti-discounting for second
The property easy for installation of dirt part 92, guide pin bushing 81 and fixed cover 82 can be integrative-structures.
In order to allow the first guard ring 9201 and the second guard ring 9202 to be close to the outer surface of inner tube 21, the first guard ring 9201
The first flexible seal ring 9204 is provided between the madial wall of the first mounting groove, the first flexible seal ring 9204 is O-ring, is utilized
The elastic reaction of first flexible seal ring 9204, can allow the first guard ring 9201 to be close to the outer surface of inner tube 21, similarly, described
The second flexible seal ring 9205 is provided between second guard ring 9202 and the madial wall of the first mounting groove, the second flexible sealing is utilized
The elastic reaction of circle 9205, allows the second guard ring 9202 to be close to the outer surface of inner tube 21.First guard ring 9201, the second guard ring
9202 is small with the outer surface gap of inner tube 21, and dust-proof effect is more preferable.
The guide pin bushing 81 towards end face outside indent be provided with the second mounting groove, first sealing scraping blade 91 be arranged on second install
In groove, while the first sealing scraping blade 91 also extends to the end face outside of mounting seat 15, due to the first sealing scraping blade 91 and inner tube 21
Outer surface between be the presence of certain interval, in order to reduce this portion gap, the first sealing mounting groove of scraping blade 91 and second
Between be provided with the 3rd flexible seal ring 94, using the elastic reaction of the 3rd flexible seal ring 94, the first sealing scraping blade 91 can be allowed
Try one's best the outer surface of inner tube 21.
The longitudinal section shape of the first sealing scraping blade 91 is substantially L-shaped in the present embodiment, and the 3rd flexible seal ring 94
Longitudinal section shape is also L-shaped, specifically, and the 3rd flexible seal ring 94 includes axial direction part and radial section, and axial direction part is located at the
Between one sealing scraping blade 91 and the end face of mounting seat 15, radial section is located at the madial wall of the first sealing mounting groove of scraping blade 91 and first
Between, so that the axial direction of 94 pair of first sealing scraping blade 91 of the 3rd flexible seal ring, radially all flexible effect so that first
Sealing scraping blade 91 can realize a small amount of movement in radially, axially position, allow the first sealing scraping blade 91 to remove the outer surface of inner tube 21
Foreign matter effect is more preferable.
In addition, another layer of protection, i.e. protection between outer tube 11 and guide pin bushing 81 are also add in the present embodiment, it is previously mentioned
Be protection in inner tube 21, but some moisture, dust can be by between guide pin bushing 81 and outer tubes 11, or fixed cover
Gap between 82 and outer tube 11 enters in electric pushrod, in order to solve this problem, is set between the guide pin bushing 81 and outer tube 11
There is the 4th flexible seal ring 95.
The longitudinal section shape of the 4th flexible seal ring 95 is preferably also L-shaped in the present embodiment, with the 3rd flexible seal ring
94 is similar, and the 4th flexible seal ring 95 also relative set axial component and radial component, axial component is located at mounting seat 15
Between end face and the end face of guide pin bushing 81, radial component is located between the madial wall of the madial wall of mounting seat 15 and guide pin bushing 81, so that
Axial direction, radial direction are all protected.
In addition, a bit important, due to setting setting for multilayer proofing, especially the 3rd sealing ring 93 in the present embodiment
Put, substantially obstructed the air pressure inside electric pushrod between outside and circulated, caused almost to turn into one inside electric pushrod
Closed space, because the transmission nut 2 of electric pushrod is moved back and forth inside electric pushrod, similar to a piston in pin
Moved back and forth in cylinder, a vacuum effect can be produced if syringe overall tightness is very good, in syringe, then the reciprocal fortune of piston
The dynamic resistance being subject to is very big, and similarly, the sealing of electric pushrod is very good in the present embodiment, and transmission nut 2 is in electric pushrod
Interior reciprocating motion can make to produce negative pressure inside electric pushrod, so that causing transmission nut 2 to move back and forth the resistance being subject to becomes big, this
The reciprocating energy consumption of sample drive nut is increased, in order to solve the electricity in this problem, the present embodiment inside electric pushrod
Cable is connected with device, cable is extended to outside electric pushrod, the electric pushrod is communicated with the cable
Venting channels outside internal and electric pushrod, electrical part is preferably motor.
The concrete structure of cable is as shown in fig. 7, cable includes sheath 10a, and sheath 10a is provided with many cored wire 10b, shield
The inner chamber that conduit 10c, shown conduit 10c are installed with set 10a forms venting channels, and conduit 10c internal diameter is 1mm~15mm, excellent
Elect 5mm as.
Venting channels are set on cable, and cable one end is connected on the motor inside electric pushrod, and the other end is then
It is connected in the power supply box of outside or on other power supply units, and this kind of power supply box or other power supply units are big equivalent to the external world
Gas is communicated, so, is equivalent to by cable, and the air pressure inside of electric pushrod is connected with ambient pressure, and
And because the power supply units such as power supply box are typically all to have corresponding water proof and dust proof measure, so rainwater etc. also will not be from cable
Venting channels are entered in electric pushrod, so as to solve the negative pressure problem inside electric pushrod well.
First, solve most intuitively effect be exactly allow transmission nut 2 move back and forth be that the resistance being subject to greatly reduces,
So as to reduce the energy loss of electric pushrod.
Secondly, the problem of solving negative pressure, not exclusively reduces the problem of nut is moved back and forth by resistance, and can also
Play other effects beyong contemplation：
Although the 1st, on electric pushrod there is provided multilayer proofing, is due to that electric pushrod is arranged under open-air atmosphere, if
First sealing scraping blade 91, the second dust guard 92 nearby adhere to rainwater, frost, the foreign matter such as sand and dust, when push rod occurs flexible, by
It is more than the air pressure inside electric pushrod in ambient atmosphere, this kind of rainwater, frost, the foreign matter such as sand and dust can enter electric pushrod by suck-back
Inside, so be even provided with the first sealing scraping blade 91, the second dust guard 92, still there is foreign matter into electric pushrod
Problem, and solving after negative pressure problem, electric pushrod is when flexible, and its air pressure inside and external pressure are consistent, at least can
Ensure that suck-back phenomenon no longer occurs, reduce the hidden danger that foreign matter enters inside electric pushrod.
2nd, the electric pushrod in solar energy techniques is applied, its operating ambient temperature is at -30 DEG C~70 DEG C, so in pole
Under the adverse circumstances at end, on 70 DEG C of daytime, -30 DEG C of night, day and night temperature reaches 100 DEG C, in this case, closed electronic to push away
There is larger difference with outside pressure in the pressure that bar inside is passed through inside 100 degrees Celsius of difference variation, electric pushrod, this
When in the presence of atmospheric pressure, the first sealing scraping blade 91, the second dust guard 92, the suffered burden of the 3rd sealing ring 93 are very
Greatly, aging procedure aggravates, and influences the service life of these sealing structures.And solve after negative pressure problem, even if by round the clock 100
DEG C the temperature difference, the pressure of the inside of electric pushrod and outside can also be consistent, can at least greatly reduce because inside and outside pressure not
The consistent burden caused to sealing structure, improves the service life of electric pushrod.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, and is familiar with
The those skilled in the art should be understood that the present invention includes but is not limited to accompanying drawing and interior described in embodiment above
Hold.The modification of any function and structure principle without departing from the present invention is intended to be included in the scope of claims.
Claims (10)
1. it is a kind of can bidirectional self-locking electric pushrod, including outer tube, inner tube, drive lead screw and transmission nut, the drive lead screw
It is rotatably installed in outer tube, the transmission nut is fixedly connected with inner tube, the electric pushrod is provided with self-locking device, its feature
It is, the self-locking device includes left shaft holder, right axle bearing and be located between left shaft holder and right axle bearing to be used to be adjacent to a left side
The brake disc of bearing block or right axle bearing, the left shaft holder, right axle bearing are arranged on outer tube, and the brake disc is fixedly mounted
On drive lead screw, the periphery of the brake disc is arranged with self-locking torsion spring, periphery, the right axle of the self-locking torsion spring and left shaft holder
The periphery of bearing, the periphery of brake disc are interference fitted.
2. as claimed in claim 1 can bidirectional self-locking electric pushrod, it is characterised in that the self-locking torsion spring and drive lead screw
Rotation direction it is identical.
3. as claimed in claim 1 can bidirectional self-locking electric pushrod, it is characterised in that set between left shaft holder and brake disc
There is left bearing, right bearing is provided between right axle bearing and brake disc.
4. as claimed in claim 1 can bidirectional self-locking electric pushrod, it is characterised in that be fixed with the outer tube left solid
Fixed board and right fixed plate, the left fixed plate and right fixed plate are located at the different both sides of brake disc, left fixed plate and described respectively
It is provided between left shaft holder between left friction plate, right fixed plate and right axle bearing and is provided with right friction plate.
5. as claimed in claim 4 can bidirectional self-locking electric pushrod, it is characterised in that the left friction plate rubs including first
Pad and the second friction plate, the first friction plate are fixedly mounted in left fixed plate, and the second friction plate is fixedly mounted on left shaft holder
On, left cushion block is provided between the first friction plate and the second friction plate.
6. as claimed in claim 4 can bidirectional self-locking electric pushrod, it is characterised in that the right friction plate rubs including the 3rd
Pad and the 4th friction plate, the 3rd friction plate are arranged in right fixed plate, and the 4th friction plate is fixedly mounted in right axle bearing, the
Right cushion block is provided between three friction plates and the 4th friction plate.
7. as claimed in claim 4 can bidirectional self-locking electric pushrod, it is characterised in that positioning table is provided with the outer tube
Fixed seat is installed, the left fixed plate, right fixed plate are positioned between positioning step and fixed seat in rank, the outer tube.
8. as claimed in claim 7 can bidirectional self-locking electric pushrod, it is characterised in that the fixed seat include seat body and
The intrinsic adjusting nut of seat is located at, the left fixed plate and right fixed plate are positioned between adjusting nut and positioning step.
9. as claimed in claim 7 can bidirectional self-locking electric pushrod, it is characterised in that the fixed seat and the outer tube lead to
Threaded connection is crossed, the outer tube is provided with the fastening screw nut for locking the fixed seat.
10. as claimed in claim 4 can bidirectional self-locking electric pushrod, it is characterised in that the left fixed plate and outer tube
Inwall, one of them is provided with the first positioning bar, and another is provided with the first locating slot matched with first positioning bar；With/
Or, the inwall of the right fixed plate and outer tube, one of them is provided with the second positioning bar, and another is provided with and the second positioning bar
The second locating slot matched somebody with somebody.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710536373.4A CN107314090A (en) | 2017-07-04 | 2017-07-04 | It is a kind of can bidirectional self-locking electric pushrod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710536373.4A CN107314090A (en) | 2017-07-04 | 2017-07-04 | It is a kind of can bidirectional self-locking electric pushrod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107314090A true CN107314090A (en) | 2017-11-03 |
Family
ID=60180583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710536373.4A Pending CN107314090A (en) | 2017-07-04 | 2017-07-04 | It is a kind of can bidirectional self-locking electric pushrod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107314090A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757872A (en) * | 2018-08-14 | 2018-11-06 | 浙江联宜电机有限公司 | Electric pushrod push pipe seal protection structure |
| CN110224544A (en) * | 2019-06-18 | 2019-09-10 | 扬州奥美丽电气科技有限公司 | Double end driving push rod, lifting leg and lifting platform |
| WO2021047355A1 (en) * | 2019-09-12 | 2021-03-18 | 浙江捷昌线性驱动科技股份有限公司 | Self-locking device for linear actuator and linear actuator |
| WO2021121342A1 (en) * | 2019-12-18 | 2021-06-24 | 浙江捷昌线性驱动科技股份有限公司 | Brake device for linear actuator, and linear actuator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757872A (en) * | 2018-08-14 | 2018-11-06 | 浙江联宜电机有限公司 | Electric pushrod push pipe seal protection structure |
| CN108757872B (en) * | 2018-08-14 | 2023-09-22 | 浙江联宜电机有限公司 | Sealing protection structure for push rod and push pipe of electric push rod |
| CN110224544A (en) * | 2019-06-18 | 2019-09-10 | 扬州奥美丽电气科技有限公司 | Double end driving push rod, lifting leg and lifting platform |
| WO2021047355A1 (en) * | 2019-09-12 | 2021-03-18 | 浙江捷昌线性驱动科技股份有限公司 | Self-locking device for linear actuator and linear actuator |
| WO2021121342A1 (en) * | 2019-12-18 | 2021-06-24 | 浙江捷昌线性驱动科技股份有限公司 | Brake device for linear actuator, and linear actuator |
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