CN108591403A - A kind of switching device and linear actuators of relieving mechanism - Google Patents
A kind of switching device and linear actuators of relieving mechanism Download PDFInfo
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- CN108591403A CN108591403A CN201810352615.9A CN201810352615A CN108591403A CN 108591403 A CN108591403 A CN 108591403A CN 201810352615 A CN201810352615 A CN 201810352615A CN 108591403 A CN108591403 A CN 108591403A
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- gear
- switching device
- rotation
- pin
- relieving mechanism
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- 230000007246 mechanism Effects 0.000 title claims abstract description 35
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000008602 contraction Effects 0.000 claims abstract description 6
- 230000033001 locomotion Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 54
- 238000013016 damping Methods 0.000 description 24
- 230000008878 coupling Effects 0.000 description 19
- 238000010168 coupling process Methods 0.000 description 19
- 238000005859 coupling reaction Methods 0.000 description 19
- 238000005452 bending Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 241000237858 Gastropoda Species 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types
- F16H37/124—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types for interconverting rotary motion and reciprocating motion
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/14—Torsion springs consisting of bars or tubes
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
- F16H57/10—Braking arrangements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Gear Transmission (AREA)
Abstract
The invention discloses a kind of switching devices of relieving mechanism, belong to embroidery technical field, relieving mechanism is mounted in linear actuators, the relieving mechanism includes rotation brake part, relieving mechanism is in release conditions or lockup state by controlling the rotation of rotation brake part to control linear actuators, the switching device is for locking and unlocking the rotation brake part, the switching device includes pedestal, Brake torsion spring, the Brake torsion spring includes torsional spring main body, first pin, second pin, the torsional spring main body is sleeved on rotation brake part, first pin is fixed on pedestal, second pin is pulled by puller, under puller pulling function, radial contraction occurs for the Brake torsion spring to hold the rotation brake part tightly.In addition, the invention also discloses a kind of linear actuators.The advantage of the invention is that operation is more laborsaving, the step-less adjustment never between release conditions and release conditions can also be realized.
Description
【Technical field】
The present invention relates to a kind of switching device of relieving mechanism and linear actuators, 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.
Existing linear actuators on the market is much provided with relieving mechanism, relieving mechanism purpose between transmission parts
Be when being that driving motor runs out of steam, nut can the rotation of reverse drive lead screw, be equivalent to a releasing linear actuators from
The device of power is locked, relieving mechanism is by needing a switching device to be controlled, and current switching device generally existing structure
Complexity, not laborsaving enough the problem of operation.
【Invention content】
A kind of opening for relieving mechanism is provided technical problem to be solved by the present invention lies in overcome the deficiencies in the prior art
Device and linear actuators are closed, operation is more laborsaving, can also realize the stepless-adjustment never between release conditions and release conditions
Section.
Above-mentioned technical problem is solved, the present invention adopts the following technical scheme that：
A kind of switching device of relieving mechanism, relieving mechanism are mounted in linear actuators, and the relieving mechanism includes rotation
Transformation of ownership moving part, relieving mechanism are in release conditions or locking shape by controlling the rotation of rotation brake part to control linear actuators
State, for the switching device for locking and unlocking the rotation brake part, the switching device includes pedestal, Brake torsion spring, institute
It includes torsional spring main body, the first pin, second pin to state Brake torsion spring, and the torsional spring main body is sleeved on rotation brake part, and first
Pin is fixed on pedestal, and second pin is pulled by puller, and under puller pulling function, the Brake torsion spring occurs radial
It shrinks to hold the rotation brake part tightly.
Advantageous effect using the present invention：
In the present invention, the locking to rotation brake part is realized, the characteristic of Brake torsion spring using a Brake torsion spring,
By clockwise, counterclockwise stir when, the effect that will produce radial contraction, radially extend out, this for utilizing Brake torsion spring be special
Property, it can be used for holding Brake torsion spring tightly rotation brake part, using the frictional force between Brake torsion spring and rotation brake part, to rotation
Transformation of ownership moving part is locked, this mode of braking, simple in structure, at low cost, while the space occupied is small, allows the knot of switching device
Structure is compacter.
In addition, pulling second pin with puller, this pulling mode is very laborsaving, need not be generated to second pin
Great role power, Brake torsion spring change can deform upon, and more convenient, braking of the Brake torsion spring to rotation brake part
Power can become controllable, because puller determines the deflection size of Brake torsion spring to the pulling force size of Brake torsion spring,
Using this Modulatory character, the never step-less adjustment between release conditions and release conditions may be implemented in user, and traditional opens
Device is closed, is typically only capable to realize release conditions or non-release conditions.
Preferably, being equipped with pull rod between the puller and Brake torsion spring, the pull rod is rotatably installed on pedestal, institute
Second pin location and installation is stated on pull rod.
Preferably, the pull rod includes pull rod main body and sleeve, the sleeve lining, which is equipped with, positions the second pin
Locating slot.
Preferably, the torsional spring main body is sleeved in sleeve, sleeve is equipped with the evacuation notch stretched out for the first pin.
Preferably, being connected with sliding block between the pull rod and puller, the sliding block is slidably mounted on pedestal, described
Sliding block is equipped with walking trough, and the pull rod is equipped with roller bearing, and the roller bearing is slided and is rotatably assorted with walking trough.
Preferably, the puller includes drag-line, the drag-line is connect with sliding block, is equipped between the sliding block and drag-line
Resetting spring.
Preferably, the puller includes two or more drag-lines.
Preferably, the switching device further includes box cover, the box cover is connect with pedestal, and the Brake torsion spring is mounted on
In box cover.
In addition, invention additionally discloses a kind of linear actuators, including geared worm, worm gear, lead screw, nut, geared worm
Drive worm gear rotation, worm gear rotation that lead screw rotation, lead screw rotation is driven to drive nut axial movement, be equipped between worm gear and lead screw
Relieving mechanism, the relieving mechanism include planetary gear set, and planetary gear set includes ring gear, sun gear, planet tooth
Wheel, planet carrier, sun gear are rotated synchronously with the worm gear, and planet carrier is rotated synchronously with lead screw, and relieving mechanism further includes being used for
To the rotation brake part of ring gear braking, the rotation brake part by the switching device described in a kind of any of the above-described scheme into
Row driving.
Preferably, the relieving mechanism includes external toothing, the external toothing and ring gear rotate synchronously, the rotation system
Moving part is the braking worm gear engaged with external toothing.
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 switching device and linear actuators of a kind of relieving mechanism, the present embodiment
Linear actuator includes driving motor 1, geared worm 2, worm gear 3, lead screw 4, nut 5, and driving motor 1 connects geared worm 2,
Geared worm 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, this
Outside, further include shell 6, outer tube 7, inner tube 8 in the present embodiment, the nut 5 is connect with inner tube 8, and shell 6 is connect with outer tube 7, is driven
Dynamic motor 1 is fixedly mounted in shell 6, and the axial movement of nut 5 is eventually exhibited as axially opposing between inner tube 8 and outer tube 7
Displacement.
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；
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.When linear actuators does not need release function, i.e., in the unreleased state, brake makes ring gear 10
Dynamic, ring gear 10 cannot be freely rotated at this time.Under 1 active drive of driving motor, worm gear 3 drives sun gear 11 to rotate, too
Positive gear 11 drives the rotation in the ring gear 10 of planetary gear 12, while the also corresponding rotation of planet carrier 13, due to planet carrier 13 with
Lead screw 4 rotates synchronously, 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.
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, what braking worm screw 14 can be additional as one
Type of drive drives linear actuators, because when driving motor 1 runs out of steam, when rolling brake worm gear 3, brakes worm gear
3 can drive external toothing 15 accordingly to rotate, and ring gear 10 also can be rotated accordingly, and sun gear 11 is fixed at this time, therefore interior
Gear ring 10 can drive planetary gear 12, planet carrier 13 to rotate together when rotating, and being equivalent to can drive lead screw 4 to rotate, therefore brake
Using the structure of braking worm screw 14, can come as a kind of additional type of drive in the case where driving motor 1 runs out of steam
Drive linear actuators movement.
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.
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.
It should be noted that braking worm screw 14 is substantially the one of which embodiment party of rotation brake part in relieving mechanism
Formula, although it is braking worm screw, those skilled in the art to illustrate switching device in the present embodiment for what is locked or unlocked
It will be appreciated that, what switching device was unlocked or locked is not limited to only brake worm screw, when the relieving mechanism in linear actuators
When not being planetary gear set, rotation brake part can also be other structures, it is not limited to brake worm screw.Therefore in other realities
It applies in mode, when the rotation brake part in relieving mechanism uses the switching device in the present embodiment, it should be understood that fall into this
In the protection domain of invention.
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 package assembly 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, and concrete structure can specifically be unfolded below, the end face of sun gear 11 and auxiliary
Catch offsets to form axially position, and in other words, the tail end of worm gear 3 is by the second limit stop ring 31a limits of the second sliding sleeve 31, snail
The front end of wheel 3 is limited by sun gear 11, and this positioning method structure is compacter, and cost is lower, while being assembled also more square
Just.
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.
In addition, in the present embodiment, the shaft coupling of monodirectional locking, the connection of monodirectional locking are equipped between the worm gear 3 and lead screw 4
Axis device can allow driving force normally to transmit when effect is normal direction driving rotation, conversely, when reverse drive rotates, meeting
Play the role of locking or prevention to driving force, is with playing in the present embodiment：When worm gear 3 is used as main driving
When, it can normally drive lead screw 4 to be rotated, conversely, when lead screw 4 is as main driving, then can play resistance to the rotation of lead screw 4
Buddhist nun acts on, and lead screw 4 is prevented to be rotated further, this is the reverse self-locking power for improving linear actuators in fact.
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, the bending pin 35a radial inward bendings of transmission torsional spring 35, the first plectrum 36 is transmitted to transmission torsional spring 35 and is turned round
When square, the bending pin 35a screws direction towards transmission torsional spring 35 and is 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 in the present embodiment, when sun tooth
When wheel 11 partially passes through centre bore 3a, the end face of sun gear 11 can be kept out by the first arc-like sheet, and the first arc-like sheet is at this time
The effect for above assisting catch is acted as, is equivalent to, worm gear 3 is the to the auxiliary catch of sun gear 11 in the present embodiment
One 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.
Embodiment two
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.
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. a kind of switching device of relieving mechanism, relieving mechanism is mounted in linear actuators, and the relieving mechanism includes rotation
Brake component, relieving mechanism are in release conditions or locking shape by controlling the rotation of rotation brake part to control linear actuators
State, the switching device is for locking and unlock the rotation brake part, which is characterized in that the switching device include pedestal,
Brake torsion spring, the Brake torsion spring include torsional spring main body, the first pin, second pin, and the torsional spring main body is sleeved on rotation system
On moving part, the first pin is fixed on pedestal, and second pin is pulled by puller, under puller pulling function, the braking
Radial contraction occurs for torsional spring to hold the rotation brake part tightly.
2. switching device as described in claim 1, which is characterized in that pull rod is equipped between the puller and Brake torsion spring,
The pull rod is rotatably installed on pedestal, and the second pin location and installation is on pull rod.
3. switching device as claimed in claim 2, which is characterized in that the pull rod includes pull rod main body and sleeve, the set
Cylinder inner wall is equipped with the locating slot for positioning the second pin.
4. switching device as claimed in claim 3, which is characterized in that the torsional spring main body is sleeved in sleeve, is set on sleeve
There is the evacuation notch stretched out for the first pin.
5. switching device as claimed in claim 2, which is characterized in that be connected with sliding block, institute between the pull rod and puller
It states sliding block to be slidably mounted on pedestal, the sliding block is equipped with walking trough, and the pull rod is equipped with roller bearing, the roller bearing and walking
Slot is slided and is rotatably assorted.
6. switching device as claimed in claim 5, which is characterized in that the puller includes drag-line, the drag-line and sliding block
Connection is equipped with resetting spring between the sliding block and drag-line.
7. switching device as claimed in claim 6, which is characterized in that the puller includes two or more drag-lines.
8. switching device as described in claim 1, which is characterized in that the switching device further includes box cover, the box cover with
Pedestal connects, and the Brake torsion spring is mounted in box cover.
9. a kind of linear actuators, including geared worm, worm gear, lead screw, nut, geared worm drives worm gear rotation, worm gear to turn
Dynamic that lead screw rotation, lead screw rotation is driven to drive nut axial movement, relieving mechanism is equipped between worm gear and lead screw, feature exists
In the relieving mechanism includes planetary gear set, and planetary gear set includes ring gear, sun gear, planetary gear, planet
Frame, sun gear are rotated synchronously with the worm gear, and planet carrier is rotated synchronously with lead screw, and relieving mechanism further includes for ring gear
The rotation brake part of braking, the rotation brake part are driven by the switching device described in one of claim 1 to 8.
10. linear actuators as claimed in claim 9, which is characterized in that the relieving mechanism includes external toothing, the external tooth
Circle and ring gear rotate synchronously, and the rotation brake part is the braking worm gear engaged with external toothing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352615.9A CN108591403B (en) | 2018-04-19 | 2018-04-19 | Switching device of release mechanism and linear actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352615.9A CN108591403B (en) | 2018-04-19 | 2018-04-19 | Switching device of release mechanism and linear actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108591403A true CN108591403A (en) | 2018-09-28 |
| CN108591403B CN108591403B (en) | 2024-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810352615.9A Active CN108591403B (en) | 2018-04-19 | 2018-04-19 | Switching device of release mechanism and linear actuator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577850A (en) * | 2020-04-29 | 2020-08-25 | 浙江捷昌线性驱动科技股份有限公司 | Linear actuator convenient to operate |
| 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 |
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| CN208804188U (en) * | 2018-04-19 | 2019-04-30 | 浙江捷昌线性驱动科技股份有限公司 | A kind of switching device and linear actuators of relieving mechanism |
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| US6158295A (en) * | 1996-12-23 | 2000-12-12 | Linak A/S | Linear actuator |
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| CN111577850A (en) * | 2020-04-29 | 2020-08-25 | 浙江捷昌线性驱动科技股份有限公司 | Linear actuator convenient to operate |
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| 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 |
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|---|---|
| CN108591403B (en) | 2024-06-25 |
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