CN108494156A - A kind of linear actuators that unidirectional power transmits - Google Patents
A kind of linear actuators that unidirectional power transmits Download PDFInfo
- Publication number
- CN108494156A CN108494156A CN201810352618.2A CN201810352618A CN108494156A CN 108494156 A CN108494156 A CN 108494156A CN 201810352618 A CN201810352618 A CN 201810352618A CN 108494156 A CN108494156 A CN 108494156A
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- Prior art keywords
- torsional spring
- gear
- plectrum
- lead screw
- worm gear
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D67/00—Combinations of couplings and brakes; Combinations of clutches and brakes
-
- 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
-
- 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
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
- H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
- H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel
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- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses the linear actuators that a kind of unidirectional power transmits, belong to Linear transmission technical field, including driving motor, geared worm, worm gear, lead screw, nut, driving motor drives worm gear rotation by geared worm, worm gear rotation drives lead screw rotation, lead screw rotation drives nut axial movement, the shaft coupling of monodirectional locking is equipped between the worm gear and lead screw, the shaft coupling includes transmission torsional spring and the damping ring that is set with transmission torsional spring, worm gear is actively, under lead screw driven state, worm gear, which transmits torque, to transmission torsional spring and makes transmission torsional spring in radial direction and the damping ring clearance fit, worm gear is driven, under lead screw active state, lead screw transmits torque to transmission torsional spring and transmission torsional spring is made to be interference fitted in radial direction with the damping ring.The advantage of the invention is that the self-locking property of linear actuators can be improved.
Description
【Technical field】
The present invention relates to the linear actuators that a kind of unidirectional power transmits, and belong to Linear transmission technical field.
【Background technology】
Linear actuators, also referred to as electric pushrod are widely used in furniture, Medical Devices, solar power generation etc. field,
Primary structure includes driving motor, geared worm, worm gear, lead screw, nut, and operation principle is that driving motor driving geared worm turns
Dynamic, geared worm is engaged with worm gear to drive worm gear to rotate, and worm gear rotation drives lead screw rotation, lead screw rotation to drive nut shaft
To movement, nut is generally connected with inner tube, to realize the telescopic moving of inner tube.
Under the non-working condition of driving motor, linear actuators has certain self-lock ability, and the self-lock ability is main
Come from the unidirectional screw thread on lead screw, i.e., when lead screw is transmitted as active power, energy normal driving nut rotation, and work as nut
When being transmitted as active power, unidirectional screw thread will produce certain self-lock force to prevent lead screw from being rotated.However only lean on unidirectional screw thread
The self-locking property of linear actuators can not be sometimes completely secured in the self-lock force of offer.
【Invention content】
A kind of unidirectional power transmission is provided technical problem to be solved by the present invention lies in overcome the deficiencies in the prior art
Linear actuators, the self-locking property of linear actuators can be improved.
Above-mentioned technical problem is solved, the present invention adopts the following technical scheme that：
A kind of linear actuators that unidirectional power transmits, including driving motor, geared worm, worm gear, lead screw, nut, drive
Dynamic motor drives worm gear rotation, worm gear rotation that lead screw rotation, lead screw rotation is driven to drive nut axial movement by geared worm,
The shaft coupling of monodirectional locking is equipped between the worm gear and lead screw, the shaft coupling includes transmission torsional spring and is set with transmission torsional spring
Damping ring, worm gear actively, under lead screw driven state, worm gear, which transmits torque, to transmission torsional spring and makes transmission torsional spring in radial direction
With the damping ring clearance fit, worm gear is driven, under lead screw active state, and lead screw, which transmits torque, to transmission torsional spring and makes transmission turn round
Spring is interference fitted with the damping ring in radial direction.
Advantageous effect using the present invention：
Traditional linear actuators, worm gear is typically directly to drive lead screw rotation, when lead screw is since self-lock force deficiency is by spiral shell
Under female reverse drive, the problem of direct anti-pass of power can be delivered on worm gear, be eventually led to by lead screw, which is worm gear, can force driving electricity
Machine inverts, and makes a big impact to the service life of driving motor.
And in the present invention, the shaft coupling of monodirectional locking is provided between worm gear and lead screw, the shaft coupling of monodirectional locking is made
With being that can only transmit unidirectional power, lock function can be then realized when reverse drive, using in the present invention, it is possible to understand that
At, when worm gear active drive lead screw rotates, shaft coupling can ensure that normal power transmits, and when lead screw is as active drive
When, shaft coupling can generate resistance to lead screw or worm gear, to prevent worm gear rotation.It designs, can effectively improve linear activated in this way
The self-lock force of device can bear larger bearing capacity, and the service life of driving motor is effectively ensured in design in this way.
In addition, in the present invention, shaft coupling is arranged between worm gear and lead screw, i.e., it, can be in snail when lead screw reverse drive
It takes turns and is prevented from this link, all links for being equivalent to worm gear to driving motor are all unaffected, in this way can be with effective protection
Service life of the worm gear to the parts between driving motor.
Meanwhile the shaft coupling in the present invention, it is realized using the cooperation of transmission torsional spring and damping ring, groundwork is former
Reason is, to the radial clearance between control and damping ring, can to work as clearance fit with the principle of radial contraction using transmission torsional spring
When, it does not generate resistance substantially between the two, when interference fit, generates larger resistance between the two, the shaft coupling of this structure,
Structure is relatively simple, and the requirement of parts the space occupied is small, and it is very limited to meet very much this inner space of linear actuators
Installation environment, while this parts cost of transmission torsional spring, damping ring is relatively low.
Preferably, the shaft coupling includes circumferentially spaced first plectrum, the second plectrum, the first plectrum be used for
Worm gear connects, and for the second plectrum for being connect with screw rod transmission, transmission torsional spring is set in the first plectrum and the second plectrum, transmission torsional spring
Including bending pin, the bending pincard is mounted between the first plectrum and the second plectrum.
Preferably, the transmission torsional spring is sleeved on outside the first plectrum and the second plectrum, the damping ring is sleeved on transmission and turns round
Outside spring, the bending pin radial inward bending of transmission torsional spring, when the first plectrum transmits torque to transmission torsional spring, the bending pin
Direction is screwed towards transmission torsional spring to be struck.
Preferably, the transmission torsional spring is sleeved in the first plectrum and the second plectrum, the damping ring is sleeved on transmission and turns round
In spring, the bending pin radially bending of transmission torsional spring, when the first plectrum transmits torque to transmission torsional spring, the bending pin
Direction is unscrewed towards transmission torsional spring to be struck.
Preferably, being equipped with planetary gear set, including ring gear, sun gear, planet between the worm gear and lead screw
Gear, planet carrier, sun gear are rotated synchronously with the worm gear, and planet carrier is rotated synchronously with lead screw, and the shaft coupling is located at snail
Between wheel and sun gear, first plectrum is connect with worm gear, and second plectrum is connect with sun gear.
Preferably, the worm gear center is equipped with centre bore, first plectrum is along circumferential first set of centre bore
Arc-like sheet, second plectrum are axial raised second arc-like sheet of sun gear upper edge.
It is enclosed preferably, second arc-like sheet passes through the centre bore and forms notched circle with the first arc-like sheet
Wall, the bending pincard is in notch.
Preferably, the internal diameter of first arc-like sheet is less than the internal diameter of centre bore, the sun gear is equipped with baffle ring,
After second arc-like sheet passes through centre bore, the baffle ring is stopped by first arc-like sheet.
Preferably, the linear actuators includes gear-box, support base, the damping ring are installed in the gear-box
It is located on support base, transmission torsional spring is sleeved in damping ring, and the worm gear is set with outside damping ring.
Preferably, the support base is equipped with center pillar on the inside of damping ring, the center pillar and damping ring are coaxial, the sun
Gear set is on center pillar.
These features and advantages of the present invention will the detailed exposure in following specific implementation mode, attached drawing.
【Description of the drawings】
Following further describes the present invention with reference to the drawings：
Fig. 1 is the structural schematic diagram of one linear actuators of the embodiment of the present invention；
Fig. 2 is to remove the structural schematic diagram after box cover in Fig. 1；
Fig. 3 is the exploded perspective view one of one linear actuator of the embodiment of the present invention；
Fig. 4 is the enlarged diagram at A in Fig. 3；
Fig. 5 is the exploded perspective view two of one linear actuator of the embodiment of the present invention；
Fig. 6 is the exploded perspective view three of one linear actuator of the embodiment of the present invention；
Fig. 7 is the exploded perspective view four of one linear actuator of the embodiment of the present invention；
Fig. 8 is internal structure schematic diagram in the embodiment of the present invention one；
Fig. 9 is the schematic cross-sectional view in the embodiment of the present invention one.
【Specific implementation mode】
The technical solution of the embodiment of the present invention is explained and illustrated with reference to the attached drawing of the embodiment of the present invention, but under
It states embodiment to be merely a preferred embodiment of the present invention, and not all.Based on the implementation example in the implementation mode, those skilled in the art
Obtained other embodiment without making creative work, belongs to protection scope of the present invention.
In the following description, occur the indicating positions such as term "inner", "outside", "upper", "lower", "left", "right" or
Position relationship is to be based on the orientation or positional relationship shown in the drawings, description embodiment merely for convenience and simplified description, and
It is not instruction or implies that signified device or element must have a particular orientation, with specific azimuth configuration and operation, because
This is not considered as limiting the invention.
Embodiment one
As shown in Figures 1 to 9, the present embodiment is the linear actuators that a kind of unidirectional power transmits, linear in the present embodiment
Actuator includes driving motor 1, geared worm 2, worm gear 3, lead screw 4, nut 5, and driving motor 1 connects geared worm 2, is driven snail
Bar 2 drives worm gear 3 to rotate, and the rotation of worm gear 3 drives lead screw 4 to rotate, and the rotation of lead screw 4 drives nut 5 to move axially, in addition, this reality
It further includes shell 6, outer tube 7, inner tube 8 to apply in example, and the nut 5 is connect with inner tube 8, and shell 6 is connect with outer tube 7, driving motor 1
It is fixedly mounted in shell 6, the axial movement of nut 5 is eventually exhibited as the axially opposing displacement between inner tube 8 and outer tube 7.
In the present embodiment, the shaft coupling equipped with monodirectional locking between the worm gear 3 and lead screw 4, the shaft coupling of monodirectional locking,
When its effect is normal direction driving rotation, driving force can be allowed normally to transmit, conversely, when reverse drive rotates, it can be to passing
Power plays the role of locking or prevention, is with playing in the present embodiment：It, can when worm gear 3 is as main driving
Normally to drive lead screw 4 to be rotated, conversely, when lead screw 4 is as main driving, then damping can be played to the rotation of lead screw 4 and is made
With prevention lead screw 4 is rotated further.
It designs in this way, can effectively improve the self-lock force of linear actuators, larger bearing capacity can be born, and in this way
The service life of driving motor is effectively ensured in design.And in the present embodiment, shaft coupling is arranged between worm gear and lead screw, i.e.,
When lead screw reverse drive, can be prevented from worm gear this link, be equivalent to worm gear to driving motor all links not
It is impacted, it in this way can be with effective protection worm gear to the service life of the parts between driving motor.
It is additionally provided with planetary gear set between worm gear 3 and lead screw 4 in the present embodiment, for details, reference can be made to Fig. 5 to Fig. 8, planets
For gear assembly for the drive connection between worm gear 3 and lead screw 4, planetary gear set includes ring gear 10, sun gear 11, row
Star gear 12, planet carrier 13, sun gear 11 are located in ring gear 10, and planetary gear 12 is engaged on ring gear 10 and sun gear
Between 11, while 12 axis rotation of planetary gear is mounted on planet carrier 13.Sun gear 11 in the present embodiment and the snail
Wheel 3 rotates synchronously, and planet carrier 13 is rotated synchronously with lead screw 4, preferably through flower between planet carrier 13 and lead screw 4 in the present embodiment
Key is connected, and planetary gear set is additionally arranged between worm gear 3 and lead screw 4, can be with by the gearing of planetary gear set
Reduce the rotating speed of worm gear 3, the torque of lead screw 4 is improved, to allow lead screw 4 to have the thrust of bigger.
The shaft coupling of monodirectional locking is also disclosed in existing machinery field, is had to the shaft coupling of monodirectional locking in the present embodiment
Institute's Optimal improvements, the shaft coupling include transmission torsional spring 35 and the damping ring that is set with transmission torsional spring 35, worm gear 3 actively, lead screw 4
Under driven state, worm gear 3, which transmits torque, to transmission torsional spring 35 and makes transmission torsional spring 35 and the damping ring clearance fit, worm gear 3
Under driven, 4 active state of lead screw, lead screw 4, which transmits torque, to transmission torsional spring 35 and makes transmission torsional spring match with the damping ring interference
It closes.It is very low in cost using the mating reaction of transmission torsional spring 35 and damping ring, while transmission torsional spring 35, damping ring are matched
It closes, it is small for traditional shaft coupling, it is low to the internal space requirements of linear actuators.
As shown in Figure 6 to 8, in the present embodiment, the shaft coupling concrete structure of this monodirectional locking is as follows：
The shaft coupling includes circumferentially spaced first plectrum 36, the second plectrum 37, and the first plectrum 36 is used for and snail
3 connection of wheel, the second plectrum 37 are used to be sequentially connected with lead screw 4, and in the present embodiment, the second plectrum 37 is connected with sun gear 11
It connects, is sequentially connected with lead screw 4 to realize indirectly, transmission torsional spring 35 is sleeved on the first plectrum 36 and the second plectrum 37, is driven
Torsional spring 35 includes bending pin 35a, and the bending pin 35a is installed between the first plectrum 36 and the second plectrum 37.
In the present embodiment, transmission torsional spring 35 is sleeved on outside the first plectrum 36 and the second plectrum 37, and the damping ring is sleeved on
Outside transmission torsional spring 35, damping ring is preferably the collar wall 30 on support base 26 in the present embodiment.The bending pin of transmission torsional spring 35
35a radial inward bendings, when the first plectrum 36 transmits torque to transmission torsional spring 35, the bending pin 35a is towards transmission torsional spring 35
Direction is screwed to be struck.
When transmission torsional spring 35 is stirred by different directions, it may occur that two states, one is shrinkage directions, and one is the sides of extending out
To, when the first plectrum 36 drives transmission torsional spring 35, radial contraction can occur for transmission torsional spring 35, so that transmission torsional spring 35
Gap between peripheral side and damping ring becomes larger, and is regarded as no friction between transmission torsional spring 35 and damping ring at this time, at this time shape
State transmission torsional spring 35 holds the first plectrum 36 tightly, the second plectrum 37 rotates simultaneously, and sun gear can normally be driven by being equivalent to worm gear 3
11 rotations.
Conversely, when transmission torsional spring 35 is reversed and stirs, i.e., the first plectrum 36 is passive, and the second plectrum 37 is active, this
When the second plectrum 37 to transmission torsional spring 35 transmit torque when, the direction that unscrews of the bending pin 35a towards transmission torsional spring 35 is dialled
Dynamic, transmission torsional spring 35 can occur radial direction and extend out, and occur to be interference fitted between transmission torsional spring 35 and damping ring after radial extend out, from
And damping is generated, damping ring can prevent transmission torsional spring 35 from being rotated further at this time, and the second plectrum can be prevented by being also equivalent to damping ring
37 are rotated further.
In other words, it when worm gear 3 is as main driving, can be rotated with normal driving lead screw 4, when lead screw 4 is used as main driving
When, when being equivalent to sun gear 11 as driving, worm gear 3 can not be driven to rotate.It can be only done single-direction transmission.
In order to which the first plectrum 36 and the second plectrum 37 can preferably be matched with transmission torsional spring 35,3 center of the worm gear is set
It is the first arc-like sheet circumferentially set along centre bore to have centre bore 3a, first plectrum 36, and second plectrum 37 is the sun
Axial raised second arc-like sheet of 11 upper edge of gear, simultaneously because the cooperation of the first arc-like sheet and the second arc-like sheet is in worm gear 3
Centre bore 3a position, be equivalent to the center that shaft coupling part is located at worm gear 3, axial position is Chong Die with worm gear 3, reduces whole knot
The axial length of structure.
It should be noted that the internal diameter of the first arc-like sheet is less than the internal diameter of centre bore 3a, while the sun in the present embodiment
It is provided with baffle ring on gear 11, when the second arc-like sheet of sun gear 11 passes through centre bore 3a, the baffle ring on sun gear 11
It can be kept out by the first arc-like sheet.
In assembling, second arc-like sheet, which passes through the centre bore and forms notched circle with the first arc-like sheet, to be enclosed
Wall, transmission torsional spring 35 are sleeved on outside the circle wall, and the bending pin 35a of transmission torsional spring 35 is installed in notch.This implementation
More stablize to transmit in example, the both ends of transmission torsional spring 35 are respectively equipped with bending pin 35a, are equivalent to transmission torsional spring 35 and have
Two bending pin 35a, and the first arc-like sheet and the second arc-like sheet just form two notches in assembling, two bendings are drawn
Foot 35a can be just installed in two notches.
In the present embodiment, damping ring is preferably the collar wall 30 on support base 26, and transmission torsional spring 35 is to be sleeved on collar wall
In 30, in this way, additional designs damping ring can be saved, collar wall 30 quite in this present embodiment has two effects, outside
All side walls can be used for positioning suit worm gear 3, and inner circumferential side wall can be used for generating damping action with transmission torsional spring 35, such
It is less to design parts, more compact structure, while also allowing for assembling.
In addition, being also provided with brake in the present embodiment, which is used to generate braking to ring gear 10 to limit it
It is freely rotated.It is largely equipped with relieving mechanism on current existing linear actuators, is mainly used for releasing linear actuators manually
Self-locking property.In the present embodiment when linear actuators does not need release function, i.e., in the unreleased state, brake is internal
Gear ring 10 is braked, and ring gear 10 cannot be freely rotated at this time.Under 1 active drive of driving motor, worm gear 3 drives sun tooth
11 rotation of wheel, sun gear 11 drive the rotation in ring gear 10 of planetary gear 12, while the also corresponding rotation of planet carrier 13, due to
Planet carrier 13 is rotated synchronously with lead screw 4, therefore finally realizes that lead screw 4 rotates；
Conversely, in the unreleased state, when driving motor 1 runs out of steam, when 4 reverse drive of lead screw, 4 row to be driven of lead screw
Carrier 13 rotates, and since ring gear 10 cannot be freely rotated, only under 11 rotation situation of sun gear, planet carrier 13 could turn
It is dynamic, however sun gear 11 is synchronous with the holding of driving motor 1, therefore sun gear 11, in the case that motionless, lead screw 4 cannot turn
Dynamic, in other words, when driving motor 1 runs out of steam, lead screw 4 can not rotate backward.
However in this case, lead screw 4 can be also allowed reversely to turn when user needs to run out of steam in driving motor 1
It is dynamic, it is necessary to use release function, in the released state, brake unclamps ring gear 10, and ring gear 10 can be free at this time
Rotation.When driving motor 1 runs out of steam down, 4 reverse drive of lead screw drives planet carrier 13 to rotate, although sun gear 11 at this time
It can not still rotate, but ring gear 10 can be freely rotated at this time, planet carrier 13 can be with ring gear 10 together along sun tooth at this time
The axle center of wheel 11 rotates together.In other words, in the released state, even driving motor 1 runs out of steam, and lead screw 4 also can be real
Now it is freely rotated.
Therefore the present embodiment is the architectural characteristic that planetary gear set is utilized in fact, completes the release work(of linear actuators
Can, belong to a kind of new structural framing, planetary gear set quite in this present embodiment can be as raising driving torque
Effect, but also as one of relieving mechanism in linear actuators part, need volume relative to traditional relieving mechanism
For outer two shaft coupling components, relieving mechanism does not need to two shaft coupling components in the present embodiment, because ring gear 10 is in conduct
While a component in planetary gear set, the effect of shaft coupling component in relieving mechanism is also acted as, i.e. ring gear 10 exists
Two effects can be completed at the same time in the present embodiment, such structure design makes the internal structure of linear actuators more step up
It gathers, parts are less.
The structure of brake can there are many embodiment, in the present embodiment preferably wherein a kind of embodiment carry out it is specific
It is unfolded, the brake in the present embodiment includes braking worm screw 14, while an external toothing 15, the external toothing are also set up in the present embodiment
15 with ring gear 10 be to rotate synchronously, external toothing 15 and the braking engaged transmission of worm screw 14.When braking worm screw 14 can be freely rotated, outside
Gear ring 15, ring gear 10 can also be freely rotated, and when braking worm screw 14 and cannot be freely rotated, it is equivalent to external toothing 15, ring gear
10 can not be freely rotated, and the release work(of linear actuators is realized so as to brake the rotatably mounted of worm screw 14 by control
Energy.
In the present embodiment, ring gear 10 and external toothing 15 are preferably integral structure, and ring gear 10 is in radially inner side, external toothing
The step of 15 in radial outside, and integral structure eliminates ring gear 10 and the connection of external toothing 15, certainly, those skilled in the art
Be readily apparent that between ring gear 10 and external toothing 15 can by be fixedly connected or spline fitted mode come realize rotate synchronously, this
Class embodiment is each fallen in protection scope of the present invention.
Brake is arranged to brake 14 this structure of worm screw by the present embodiment, brakes worm screw 14 first and is easy to control in itself,
The purpose that control braking worm screw 14 can be realized using Brake torsion spring 16 or coupling inserting mode, secondly using braking worm screw 14
Also another is acted on：Braking worm screw 14 is also used as an additional type of drive to drive linear actuators, because
When driving motor 1 runs out of steam, when rolling brake worm gear 3, braking worm gear 3 can drive external toothing 15 accordingly to rotate, internal tooth
Circle 10 also can be rotated accordingly, and sun gear 11 is fixed at this time, thus when ring gear 10 rotates can drive planetary gear 12,
Planet carrier 13 rotates together, and being equivalent to can drive lead screw 4 to rotate, therefore brake can driven using the structure of braking worm screw 14
In the case that dynamic motor 1 runs out of steam, linear actuators is driven to move as a kind of additional type of drive.
Driving braking worm screw 14 is rotated, further includes that the auxiliary for driving the braking worm gear 3 to rotate is driven in the present embodiment
Dynamic device, the auxiliary actuator are electric drive or driven by shaking.Braking worm screw 14 can be realized with additional stand-by motor and drive
Dynamic, when driving motor 1 breaks down or runs out of steam, stand-by motor can be used as auxiliary power source to drive；Certainly auxiliary is driven
Dynamic device can also be driven by shaking, i.e., drives braking worm screw 14 to rotate by hand mode.
It should be noted that those skilled in the art will be appreciated that, the structure of brake is not limited solely in the present embodiment
Description, it can also be other embodiment, specifically can refer to embodiment two.
Braking worm screw 14 is locked or unlocked for convenience, and a control braking worm screw 14 is preferably provided in the present embodiment and is locked
Or the switching device of unlock, as shown in figure 4, the switching device includes Brake torsion spring 16, pedestal 17, puller 18, braking is turned round
Spring 16 is set in outside braking worm screw 14, and when the torsional spring inner ring of Brake torsion spring 16 is shunk, Brake torsion spring 16 is real to braking worm screw 14
It now holds tightly to lock braking worm screw 14, otherwise when the torsional spring inner ring of Brake torsion spring 16 expands, Brake torsion spring 16 is to braking snail
Bar 14 is nearly free from active force, and braking worm screw 14 is in the unlocked state at this time, can be freely rotated.
And it is more convenient, Brake torsion spring 16 can become controllable to the brake force of braking worm screw 14, because drawing
Dynamic device 18 determines the deflection size of Brake torsion spring 16 to the pulling force size of Brake torsion spring 16, using this Modulatory character, uses
Family may be implemented the never step-less adjustment between release conditions and release conditions, and traditional switching device, be typically only capable to realize
Release conditions or non-release conditions.
As shown in figure 4,16 specific connection structure of Brake torsion spring in the present embodiment：The Brake torsion spring 16 includes torsional spring master
Body, the first pin 16a, second pin 16b, the torsional spring main body are sleeved on braking worm screw 14, and the first pin 16a is fixed on base
On seat 17, a jack is set, the first pin 16a, which is inserted into jack, realizes positioning specifically on pedestal 17.It needs
It is bright, it can be an individual part for pedestal 17, can also be to be integrally formed with shell 6, the present embodiment
In preferably pedestal 17 be an individual part.
First pin 16a of Brake torsion spring 16 is fixed on pedestal 17, and second pin 16b is then pulled by puller 18,
Under 18 pulling function of puller, radial contraction occurs for the Brake torsion spring 16 to hold the braking worm screw 14 tightly.Puller 18
It can be that drag-line is directly connected on second pin 16b, can also be and be connected indirectly on second pin 16b, in the present embodiment
Puller 18 and second pin 16b be directly provided with pull rod 19, which be movably arranged on pedestal 17, the other end
It is to be connected and fixed with second pin 16b.
In order to allow pull rod 19 to connect more convenient, stabilization with second pin 16b, pull rod 19 described in the present embodiment includes drawing
Bar main body and sleeve 20,20 inner wall of the sleeve are equipped with the locating slot 20a for positioning the second pin 16b.Locating slot 20a is excellent
It is selected as a L-shaped groove, is sleeved in sleeve 20 in Brake torsion spring 16, second pin 16b is first caught in from a slot of L-shaped groove, is rotated
It is navigated to after certain angle in another slot of L-shaped groove, to complete the fixation of second pin 16b.In addition, in order to allow first to draw
Foot 16a is convenient to be stretched out out of sleeve 20, and sleeve 20 is equipped with the evacuation notch 20b stretched out for the first pin 16a.
In order to make the rotation of pull rod 19 more smoothly, sliding block 21 is connected between the pull rod 19 and puller 18, it is described
Sliding block 21 is slidably mounted on pedestal 17, and the sliding block 21 is equipped with walking trough 21a, and the pull rod 19 is equipped with roller bearing 19a, institute
Roller bearing 19a is stated to slide and be rotatably assorted with walking trough 21a.When puller 18 pulls pull rod 19, the roller bearing 19a of pull rod 19 can
It slides in walking trough 21a, can also be rotated in walking trough 21a, designing pull rod 19 in this way will not interfere in rotation, together
When rotary motion trace it is also more controllable, facilitate control Brake torsion spring 16.
In the present embodiment, the puller 18 includes drag-line, and the drag-line is connect with sliding block 21, the sliding block 21 and drag-line
Between be equipped with resetting spring 22.Drag-line has two in the present embodiment, and the terminal of two drag-lines may be mounted at different location, side
Just user's operation.
As shown in figure 3, in order to preferably cover sliding block 21, pull rod 19, switching device described in the present embodiment further includes box
Lid 23, the box cover 23 are connect with pedestal 17, and the Brake torsion spring 16 is mounted in box cover 23.In the present embodiment box cover 23 be with
Pedestal 17 is articulated and connected, while being also provided with the buckle 23a of locking, and corresponding block button hole 17a is then provided on pedestal 17.Profit
Not only can parts be played with screening effect with box cover 23, while can also play guarantor to components such as pull rod 19, Brake torsion springs 16
Shield acts on.
In addition, in order to reduce frictional force of the Brake torsion spring 16 the case where not holding tightly between rainy braking worm screw 14, it is described
It brakes and is equipped with friction sleeve 24 between worm screw 14 and Brake torsion spring 16, friction sleeve 24 is preferably with notch, when Brake torsion spring 16
When not shrinking, the frictional force braked between worm screw 14 and friction sleeve 24 is relatively small, and when Brake torsion spring 16 is shunk, clamping rubs
Set 24 is wiped, friction sleeve 24 brakes braking worm screw 14 using the deformability of notch.
It should be noted that the mode of braking to braking worm screw 14, it is not limited to the Brake torsion spring 16 in the present embodiment, this
Field technology personnel are readily apparent that, can also be by the way of mechanical couplings grafting, such as are movably installed with coupling on pedestal 17
Plug-in unit is closed, coupling plug-in unit can be bolt, the coupling socket for braking worm screw 14 and being equipped with and coupling plug-in unit cooperation, the coupling
It closes plug-in unit and is inserted into coupling socket, to prevent the braking worm screw 14 from rotating.The mode of this coupling grafting makes braking worm screw 14
It is dynamic, also fall into protection scope of the present invention.
As shown in figure 5, the linear actuators further includes gear-box 25, shown gear-box 25 is by two and half gear housings
25a assembles to be formed, and the planetary gear set is mounted in gear-box 25, and the braking worm gear 3 is rotatably installed in gear-box 25
Interior, more stable in order to allow braking worm screw 14 to install, two and half gear housing 25a are provided with the peace installed for braking worm screw 14
Hole position 2501 is filled, so that 14 both ends of braking worm screw can realize positioning.
About package assembly of the planetary gear set in gear-box 25, reference can be made to shown in Fig. 6 to Fig. 7, in the present embodiment
Improvement is also optimized to the assembling mode of planetary gear set so that its assembling is compacter, volume smaller, specifically such as
Under：
Linear actuators in the present embodiment further includes a support base 26, and the tail of the support base 26 and linear actuators is drawn
27 are fixedly connected, and support base 26 is located at the side that planetary gear set draws 27 towards tail, and the first cunning is set on institute's support base 26
The tail end of set 28, first sliding sleeve 28 is equipped with the first limit stop ring 28a, and the sun gear 11 is sleeved on the first sliding sleeve 28
And it is axially positioned between the first limit stop ring 28a and planet carrier 13 or lead screw 4.
Since sun gear 11 is to realize assembling, the first sliding sleeve by the first sliding sleeve 28 with the first limit stop ring 28a
28 pairs of sun gears 11 both realize radial positioning, also realize axially position, compacter in structure for bearing, especially
It is radial space smaller, can significantly reduce the internal space requirements to gear-box 25, and increase for bearing
Add axial positioning function, in addition assemble the assembling difficulty that difficulty is significantly less than bearing, and the cost of the first sliding sleeve 28 is also wanted
It is significantly less than bearing.
Meanwhile worm gear 3 in order to facilitate the installation of, the present embodiment worm gear 3 are also to be installed by the form of sliding sleeve, specifically and
Speech, the support base 26 include center pillar 29 and the collar wall 30 positioned at 29 outer circumferential of center pillar, and first sliding sleeve 28 is sleeved on
On center pillar 29, the second sliding sleeve 31 is set in the collar wall 30, the worm gear 3 is sleeved on the second sliding sleeve 31.After assembling
Assembly relation can be found in Fig. 9, and worm gear 3 is realized by the second sliding sleeve 31 and assembled, compacter, the radial direction of the second sliding sleeve 31 in structure
Space smaller.In addition, since sun gear 11, worm gear 3 are assembled in one simultaneously by the first sliding sleeve 28, the second sliding sleeve 31 respectively
On support base 26, center pillar 29 and peripheral wall are preferably arranged concentrically in the present embodiment, therefore when sun gear 11 and worm gear 3 are pacified simultaneously
When on a support base 26, the concentricity of the two can be ensured well, i.e., same between worm gear 3 and sun gear 11
Axis degree is more preferable, and the precision of transmission is more preferable.
Preferably, the tail end of the second sliding sleeve 31 described in the present embodiment is equipped with prevent worm gear 3 from being moved towards tail end the
Two limit stop ring 31a, radial positioning and axially position can also be realized simultaneously to worm gear 3 by being equivalent to the second sliding sleeve 31, and worm gear 3
Front end then carries out axial limiting by sun gear 11, and the worm gear 3 is equipped with centre bore 3a, during 11 part of the sun gear is stretched into
Heart hole 3a, the worm gear 3 is equipped at centre bore 3a prevents the auxiliary catch that sun gear 11 is moved towards tail end direction, auxiliary gear
Piece is the step structure being located in centre bore 3a, assists catch to be preferably the second arc-like sheet, sun gear 11 in the present embodiment
Baffle ring with auxiliary catch offset to form axially position, in other words, the tail end of worm gear 3 is by the second limiting block of the second sliding sleeve 31
31a limits are enclosed, the front end of worm gear 3 is limited by sun gear 11, and this positioning method structure is compacter, and cost is lower, simultaneously
Assembling is also more convenient.
In addition, in the present embodiment lead screw 4 be with planet carrier 13 rotate synchronously, sun gear 11 with lead screw 4, planet carrier 13
When relatively rotating, can there are problems that rubbing between the two or wear, in order to reduce sun gear 11 and lead screw 4 or planet
Friction between frame 13 is equipped with friction pad 32, friction pad 32 between the front end and planet carrier 13 or lead screw 4 of the sun gear 11
Rub proofness it is more preferable.Friction pad 32 can also play the role of to 11 axially position of sun gear in the present embodiment simultaneously.
Friction pad 32 in order to facilitate the installation of, be equipped in the planet carrier 13 axially through mounting hole, the friction pad 32,
Lead screw 4 is installed in mounting hole, and the friction pad 32 is axially positioned between sun gear 11 and lead screw 4.After the completion of positioning
Schematic diagram can be found in Fig. 9.
In addition, for the assembling mode between planetary gear set, worm gear 3,26 internal structure of support base and gear-box 25,
The present embodiment is preferably specific as follows：
For support base 26, the collar wall 30 of the support base 26, which radially extends, is equipped with retainer ring 26a, the gear-box
25 inner wall is equipped with the card slot 2502 for clamping the retainer ring 26a, and retainer ring 26a is non-circular structure, retainer ring 26a in the present embodiment
Cross section be preferably octagon, card slot 2502 is also set accordingly into respective shapes, and retainer ring 26a is snap-fit in card slot 2502
Afterwards, support base 26 can not be freely rotated in gear-box 25.
For the ring gear 10 in planetary gear set, the inner wall of the gear-box 25 is equipped with the first annular groove 2503, the
One annular groove 2503 is located at the front side of card slot 2502, and the peripheral side of the ring gear 10 is equipped with the first bulge loop 10a, the first bulge loop 10a
It is installed in the first annular groove 2503, such ring gear 10 is axially assembled by the first bulge loop 10a on gear-box 25, simultaneously also
It can be rotated on gear-box 25.
Certainly, preferably, in the present embodiment between ring gear 10 and the inner wall of gear-box 25 additional one
Third sliding sleeve 33, for reducing the friction between 25 inner wall of gear-box and ring gear 10,33 outer wall of third sliding sleeve is mounted on
In first mounting groove, inner wall be equipped with matched second annular grooves 3301 of the first bulge loop 10a, the third sliding sleeve 33 is by two
Half ring set 33a compositions.
For lead screw 4, it is arranged with bearing outside the lead screw 4, specifically, it is to be sleeved on planet carrier 13 that bearing, which has half,
On, the other half is sleeved on by a bearing holder (housing, cover) 39 on lead screw 4, and the inner wall of the gear-box 25 is equipped with the axis of installation bearing 38
Hold slot 2504.
As shown in Figure 6 and Figure 7, in order to make planetary gear set operably more stable, the present embodiment is to planetary gear set
It is correspondingly improved, it is specific as follows：
The planetary gear set further includes planetary gear retainer 34, and the planetary gear retainer 34 is equipped with first
Location hole 34a and second location hole 34b, planetary gear retainer 34 are fixedly connected by second location hole 34b with planet carrier 13,
The planet wheel spindle 35 for installing planetary gear 12 is provided on planet carrier 13, planetary gear 12 is sleeved on planet wheel spindle 35,
35 one end of the planet wheel spindle is mounted on planet carrier 13, and the other end is mounted in first positioning hole 34a.
The present embodiment is improved planetary gear retainer 34, and traditional planet wheel spindle 35 only has one end rotation in planet
On frame 13,12 frame of planetary gear is only to be kept fixed with planet carrier 13, and be provided on planet wheel spindle 35 in the present embodiment
It is used to support the first positioning hole 34a of planet wheel spindle 35, so that the both ends of planet wheel spindle 35 can be supported, allows planet
The circle beating degree smaller of wheel shaft 35, stability is more preferable, and planetary gear 12 can be highly stable in transmission process.
By there are three planetary gears 12 in this present embodiment, therefore 35 phase of the present embodiment planet wheel spindle should have three, and first is fixed
There are three position hole 34a is then corresponding, and second location hole 34b, it is preferably provided between adjacent first positioning hole 34a, therefore this reality
Apply a second location hole 34b also it is corresponding preferably there are three.
Planet wheel spindle 35 is pierced by disengaging from planetary gear retainer 34 in order to prevent, and the planet wheel spindle 35 is towards planet
34 one end of retainer for gear is equipped with stage portion, and the stage portion is by 34 axially position of planetary gear retainer.In order to reduce
The friction of the end face and planetary gear retainer 34 of planetary gear 12, the planetary gear retainer 34 is in second location hole 34b
Side be extended with raised surrounding edge 34c towards 13 direction of planet carrier, after raised surrounding edge 34c is set, the end face of planetary gear 12 only with
Raised surrounding edge 34c contacts, can effectively reduce contact area.
The planetary gear retainer 34 is equipped with the gear grooved 34d of accommodating planetary gear 12, with more preferably to planetary gear
12 realizations are held in position.There are three being set due to planetary gear 12 described in the present embodiment, the gear grooved 34d also should mutually have three
A, three gear grooved 34d are circumferentially spaced, and the first positioning hole 34a is between adjacent gear grooved 34d, such knot
Structure design more compact and reasonable.
Embodiment two
The difference between this embodiment and the first embodiment lies in it to ring gear braking is carried out using braking worm screw that embodiment is a kind of
It brakes, in the present embodiment, ring gear is braked, using the torsional spring directly outside one ring gear of external suit of ring gear, pass through drawing
The outer torsional spring of rope direct pull ring gear, radial contraction or radial direction to realize the outer torsional spring of ring gear extend out, when torsional spring outside ring gear
When radial contraction, braking can be generated to ring gear, be the alternative of the brake a kind of to embodiment.
Embodiment three
The difference between this embodiment and the first embodiment lies in the coupler structure of monodirectional locking between worm screw and lead screw is
Difference, in the present embodiment, the transmission torsional spring is sleeved in the first plectrum and the second plectrum, and the damping ring is to be sleeved on transmission to turn round
In spring, in other words, damping ring is located at most inner side, and the first plectrum, the second plectrum are located at outermost, and transmission torsional spring is located at damping ring
Between first plectrum, the second plectrum.
The bending pin of transmission torsional spring in the present embodiment is radially bending, and the first plectrum is transmitted to transmission torsional spring and turned round
When square, the bending pin unscrews direction towards transmission torsional spring and is struck, and when the second plectrum transmits torque to transmission torsional spring, institute
It states bending pin and screws direction towards transmission torsional spring and be struck, operation principle is as follows：
When the first plectrum is as driving, transmission torsional spring occurs radial direction and extends out, at this time the inside of transmission torsional spring and damping ring
Outside between gap become larger, therefore be believed that frictional force between transmission torsional spring and damping ring becomes smaller, transmission torsional spring at this time
It is free to rotate, to which transmission torsional spring can drive the first plectrum, the second plectrum to rotate together；
And when the second plectrum is as driving, radial contraction occurs for torsional spring, at this time the inside of transmission torsional spring and damping ring it
Between be interference fitted, therefore be believed that damping ring prevent transmission torsional spring rotate, the second plectrum is prevented from rotating at this time.
By this embodiment in this present embodiment, need that a damping ring, damping ring are separately provided on support base
Preferably it is located between center pillar and collar wall.
Example IV
The difference between this embodiment and the first embodiment lies in planetary gear is not provided in the present embodiment between worm gear and lead screw
The shaft coupling of component, monodirectional locking is set up directly between worm gear and lead screw, and it is directly to be connect with worm gear to be equivalent to the first plectrum,
Second plectrum is directly connect with lead screw.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, is familiar with
The those skilled in the art should be understood that the present invention includes but not limited to attached drawing and interior described in specific implementation mode above
Hold.The modification of any function and structure principle without departing from the present invention is intended to be included in the range of claims.
Claims (10)
1. the linear actuators that a kind of unidirectional power transmits, including driving motor, geared worm, worm gear, lead screw, nut, driving
Motor drives worm gear rotation, worm gear rotation that lead screw rotation, lead screw rotation is driven to drive nut axial movement by geared worm,
Be characterized in that, between the worm gear and lead screw be equipped with monodirectional locking shaft coupling, the shaft coupling include transmission torsional spring and with biography
The damping ring of dynamic torsional spring suit, worm gear actively, under lead screw driven state, worm gear, which transmits torque, to transmission torsional spring and makes transmission torsional spring
In radial direction and the damping ring clearance fit, worm gear is driven, under lead screw active state, and lead screw transmits torque to transmission torsional spring
And transmission torsional spring is made to be interference fitted in radial direction with the damping ring.
2. linear actuators as described in claim 1, which is characterized in that the shaft coupling includes circumferentially spaced first
Plectrum, the second plectrum, the first plectrum with worm gear for connecting, and the second plectrum with screw rod transmission for connecting, transmission torsional spring suit
In the first plectrum and the second plectrum, transmission torsional spring includes bending pin, and the bending pincard is mounted in the first plectrum and second group
Between piece.
3. linear actuators as claimed in claim 2, which is characterized in that the transmission torsional spring is sleeved on the first plectrum and second
Outside plectrum, the damping ring is sleeved on outside transmission torsional spring, the bending pin radial inward bending of transmission torsional spring, and the first plectrum is to transmission
When torsional spring transmits torque, the bending pin screws direction towards transmission torsional spring and is struck.
4. linear actuators as claimed in claim 2, which is characterized in that the transmission torsional spring is sleeved on the first plectrum and second
In plectrum, the damping ring is sleeved in transmission torsional spring, the bending pin radially bending of transmission torsional spring, and the first plectrum is to transmission
When torsional spring transmits torque, the bending pin unscrews direction towards transmission torsional spring and is struck.
5. the linear actuators as described in one of claim 2 to 4, which is characterized in that be equipped with row between the worm gear and lead screw
Star gear assembly, planetary gear set include ring gear, sun gear, planetary gear, planet carrier, sun gear and the worm gear
Rotate synchronously, planet carrier and lead screw rotate synchronously, the shaft coupling positioned at worm gear and sun gear between, first plectrum and
Worm gear connects, and second plectrum is connect with sun gear.
6. linear actuators as claimed in claim 5, which is characterized in that the worm gear center be equipped with centre bore, described first
Plectrum is the first arc-like sheet circumferentially set along centre bore, and second plectrum is axial raised second arc of sun gear upper edge
Shape piece.
7. linear actuators as claimed in claim 6, which is characterized in that second arc-like sheet pass through the centre bore and with
First arc-like sheet forms notched round wall, and the bending pincard is in notch.
8. linear actuators as claimed in claim 6, which is characterized in that the internal diameter of first arc-like sheet is less than centre bore
Internal diameter, the sun gear are equipped with baffle ring, and after the second arc-like sheet passes through centre bore, the baffle ring is hindered by first arc-like sheet
Gear.
9. linear actuators as claimed in claim 7, which is characterized in that the linear actuators includes gear-box, the tooth
Support base is installed, the damping ring is located on support base, and transmission torsional spring is sleeved in damping ring, is set with outside damping ring in roller box
The worm gear.
10. linear actuators as claimed in claim 9, which is characterized in that the support base is equipped with center pillar on the inside of damping ring,
The center pillar and damping ring are coaxial, and the sun gear is sleeved on center pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352618.2A CN108494156A (en) | 2018-04-19 | 2018-04-19 | A kind of linear actuators that unidirectional power transmits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352618.2A CN108494156A (en) | 2018-04-19 | 2018-04-19 | A kind of linear actuators that unidirectional power transmits |
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| Publication Number | Publication Date |
|---|---|
| CN108494156A true CN108494156A (en) | 2018-09-04 |
Family
ID=63312536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810352618.2A Pending CN108494156A (en) | 2018-04-19 | 2018-04-19 | A kind of linear actuators that unidirectional power transmits |
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| Country | Link |
|---|---|
| CN (1) | CN108494156A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916096A (en) * | 2019-02-14 | 2019-06-21 | 浙江中控太阳能技术有限公司 | A kind of elevation drive of the heliostat for tower type solar energy thermal power generation |
| CN111981097A (en) * | 2020-06-09 | 2020-11-24 | 浙江捷昌线性驱动科技股份有限公司 | One-way driving linear actuator with hand-rotating release device |
| CN117728624A (en) * | 2024-02-18 | 2024-03-19 | 无锡艾尔特线性运动机械有限公司 | Direct current electric putter based on photovoltaic cell board supports usefulness |
-
2018
- 2018-04-19 CN CN201810352618.2A patent/CN108494156A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916096A (en) * | 2019-02-14 | 2019-06-21 | 浙江中控太阳能技术有限公司 | A kind of elevation drive of the heliostat for tower type solar energy thermal power generation |
| CN111981097A (en) * | 2020-06-09 | 2020-11-24 | 浙江捷昌线性驱动科技股份有限公司 | One-way driving linear actuator with hand-rotating release device |
| CN117728624A (en) * | 2024-02-18 | 2024-03-19 | 无锡艾尔特线性运动机械有限公司 | Direct current electric putter based on photovoltaic cell board supports usefulness |
| CN117728624B (en) * | 2024-02-18 | 2024-05-14 | 无锡艾尔特线性运动机械有限公司 | Direct current electric putter based on photovoltaic cell board supports usefulness |
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