CN208804189U - A kind of linear actuators - Google Patents

Abstract

The utility model discloses a kind of linear actuators, including driving motor, geared worm, worm gear, screw rod, nut, driving motor connects geared worm, and geared worm drives worm gear rotation, and worm gear rotation drives screw rod rotation, screw rod rotation drives nut axial movement, further include: planetary gear set, if between worm gear and screw rod, including ring gear, sun gear, planetary gear, planet carrier, sun gear and the worm gear rotate synchronously, and planet carrier and screw rod rotate synchronously；Brake, for ring gear braking, including outer gear ring.It the utility model has the advantage of while improving thrust using planetary gear set, is also discharged by planetary gear set, structure design is more compact.

Description

A kind of linear actuators

[technical field]

The utility model relates to a kind of linear actuators, belong to Linear transmission technical field.

[background technique]

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, screw rod, nut, and working principle is that driving motor driving geared worm turns Dynamic, geared worm engages that worm gear is driven to rotate with worm gear, and worm gear rotation drives screw rod rotation, and screw rod rotation drives 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 It is when being that driving motor runs out of steam, nut can be driven in the reverse direction screw rod rotation, and current published relieving mechanism is usually It is realized by clutch action between two shaft coupling components, and linear actuators inner space is very limited, it is additional to increase by two Shaft coupling component realizes that clutch can occupy larger space.

[utility model content]

It is provided the technical problem to be solved by the utility model is to overcome the deficiencies in the prior art a kind of linear activated Device is also discharged by planetary gear set while improving thrust using planetary gear set, and structure design is tighter It gathers.

Above-mentioned technical problem is solved, the utility model adopts the following technical solution:

A kind of linear actuators, including driving motor, geared worm, worm gear, screw rod, nut, driving motor connection transmission Worm screw, geared worm drive worm gear rotation, and worm gear rotation drives screw rod rotation, and screw rod rotation drives nut axial movement, also wraps It includes:

Planetary gear set, if between worm gear and screw rod, including ring gear, sun gear, planetary gear, planet carrier, Sun gear and the worm gear rotate synchronously, and planet carrier and screw rod rotate synchronously；

Brake, for being rotated synchronously to ring gear braking, including outer gear ring, the outer gear ring and ring gear,

The outer gear ring is engaged with braking worm screw.

Using the utility model has the beneficial effects that

1, it is additionally arranged planetary gear set between worm gear and screw rod, by the transmission effect of planetary gear set, can subtract The revolving speed of small gear, improves the torque of screw rod, so that screw rod be allowed to have bigger thrust；

2, a brake is set, which braked to the ring gear in planetary gear set, and work is former Reason is:

When linear actuators does not need release function, i.e., in the unreleased state, brake brakes ring gear, Ring gear cannot be freely rotated at this time.Under driving motor active drive, worm gear drives sun gear rotation, and sun gear drives Planetary gear rotates in ring gear, while planet carrier also accordingly rotates, since planet carrier and screw rod rotate synchronously, thus it is final real Existing screw rod rotation；

Conversely, in the unreleased state, when driving motor runs out of steam, and screw rod is driven in the reverse direction, screw rod planet to be driven Frame rotation, since ring gear cannot be freely rotated, only under sun gear rotation situation, planet carrier is just able to rotate, however too Positive gear is synchronous with driving motor holding, therefore sun gear, in motionless situation, screw rod is not able to rotate, and in other words, works as drive When dynamic motor runs out of steam, screw rod can not be rotated backward.

However in this case, when user needs also screw rod be allowed to rotate backward when driving motor runs out of steam, It just needs to use release function, in the released state, brake unclamps ring gear, and ring gear can be freely rotated at this time.When Driving motor runs out of steam down, and screw rod is driven in the reverse direction, and drives planet carrier rotation, although sun gear can not still rotate at this time, That ring gear can be freely rotated at this time, at this time planet carrier can the axle center together with ring gear along sun gear rotate together.It changes For it, in the released state, even driving motor runs out of steam, and screw rod is also able to achieve and is freely rotated.

Therefore the utility model is the architectural characteristic that planetary gear set is utilized in fact, completes the release of linear actuators Function belongs to a kind of new structural framing, and the planetary gear set being equivalent in the utility model can be turned round as transmission is improved The effect of square, but also become one of part of relieving mechanism in linear actuators, it is needed relative to traditional relieving mechanism For wanting additional two shaft coupling components, relieving mechanism does not need two shaft coupling components in the utility model, because ring gear exists While as a component in planetary gear set, the effect of shaft coupling component in relieving mechanism, i.e. ring gear are also acted as Can be completed at the same time two effects in the present invention, such structure design so that the internal structure of linear actuators more It is compact.

Preferably, the linear actuators further includes outer gear ring, the outer gear ring and ring gear are rotated synchronously, described outer Gear ring is engaged with braking worm screw.

Preferably, the ring gear and outer gear ring are structure as a whole.

Preferably, being set with Brake torsion spring outside the braking worm screw, the Brake torsion spring shrinks torsional spring inner ring or expansion Torsional spring inner ring, to be locked or unlocked to braking worm screw.

Preferably, the linear actuators further includes pedestal and puller, the Brake torsion spring includes torsional spring main body, One pin, second pin, the torsional spring main body are sleeved on braking worm screw, and the first pin is fixed on the base, second pin by Puller pulls, and under puller pulling function, radial contraction occurs for the Brake torsion spring to hold the braking worm screw tightly.

Preferably, being equipped with pull rod between the puller and Brake torsion spring, the pull rod is rotatablely installed on the base, 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, being connected with sliding block between the pull rod and puller, the sliding block is slidably installed on the base, 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, being equipped with friction sleeve between braking worm screw and the Brake torsion spring.

Preferably, being movably installed with coupling plug-in unit on the linear actuators, the braking worm screw is equipped with and couples The coupling socket of plug-in unit cooperation, the coupling plug-in unit insertion coupling socket, to prevent the braking worm screw from rotating.

Preferably, the linear actuators further includes gear-box, the planetary gear set is mounted in gear-box, institute Braking worm screw is stated to be rotatably installed in gear-box.

Preferably, the sun gear is located at the center of ring gear, it is engaged at least between sun gear and ring gear One planetary gear, the planetary gear are mounted on the planet carrier, and the planet carrier is fixedly connected with the screw rod.

Preferably, the linear actuators further includes the auxiliary actuator for driving the braking worm screw to rotate, it is described auxiliary Helping driver is electric drive or driven by shaking.

Preferably, the brake includes the outer torsional spring of ring gear being sleeved on outside the ring gear.

Preferably, being equipped with the shaft coupling of monodirectional locking between the worm gear and sun gear, the shaft coupling includes passing Dynamic torsional spring and damping ring with transmission torsional spring suit, worm gear actively, under sun gear driven state, worm gear transmits torque to being driven Torsional spring simultaneously makes transmission torsional spring and the damping ring clearance fit, and worm gear is driven, under sun gear active state, and screw rod transmits torque To transmission torsional spring and make to transmit torsional spring and damping ring interference fit.

Preferably, the shaft coupling includes circumferentially spaced first plectrum, the second plectrum, the first plectrum be used for Worm gear connection, for connecting with sun gear, transmission torsional spring is sleeved on the first plectrum and the second plectrum the second plectrum, and transmission is turned round Spring includes bending pin, and 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 set is turned round in transmission 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 worm gear center is equipped with centre bore, first plectrum is first set along centre bore circumferential direction Arc-like sheet, second plectrum are along axial raised second arc-like sheet on sun gear, and second arc-like sheet passes through described Centre bore simultaneously forms notched round wall with the first arc-like sheet.

Preferably, the linear actuators further includes the support base set on planetary gear set tail end side, supported The first sliding sleeve is set on seat, the tail end of first sliding sleeve is equipped with the first limit stop ring, and the sun gear is sleeved on first On sliding sleeve and it is axially positioned between first limit stop ring and planet carrier or screw rod.

Preferably, being equipped with friction pad between the front end and planet carrier or screw rod of the sun gear.

Preferably, the support base includes center pillar and the collar wall positioned at center pillar outer circumferential, the first sliding sleeve set On center pillar, the second sliding sleeve is set in the collar wall, the worm gear set is on the second sliding sleeve.

These features and advantages of the utility model will the detailed exposure in following specific embodiment, attached drawing.

[Detailed description of the invention]

The utility model is described further with reference to the accompanying drawing:

Fig. 1 is the structural schematic diagram of one linear actuators of the utility model embodiment；

Fig. 2 is to remove the structural schematic diagram after box cover in Fig. 1；

Fig. 3 is the perspective view of the explosion one of one linear actuator of the utility model embodiment；

Fig. 4 is the enlarged diagram in Fig. 3 at A；

Fig. 5 is the perspective view of the explosion two of one linear actuator of the utility model embodiment；

Fig. 6 is the perspective view of the explosion three of one linear actuator of the utility model embodiment；

Fig. 7 is the perspective view of the explosion four of one linear actuator of the utility model embodiment；

Fig. 8 is schematic diagram of internal structure in the utility model embodiment one；

Fig. 9 is the schematic cross-sectional view in the utility model embodiment one.

[specific embodiment]

The technical solution of the utility model embodiment is explained below with reference to the attached drawing of the utility model embodiment and Illustrate, but following embodiments are only the preferred embodiment of the utility model, and not all.Based on the implementation example in the implementation mode, Those skilled in the art's obtained other embodiments without making creative work, belong to the utility model Protection scope.

In the following description, occur term "inner", "outside", "upper", "lower", the indicating positions such as "left", "right" or Positional 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 that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, because This should not be understood as limiting the present invention.

Embodiment one

As shown in Figures 1 to 9, the present embodiment is a kind of linear actuators, and the present embodiment linear actuator includes driving Motor 1, geared worm 2, worm gear 3, screw rod 4, nut 5, driving motor 1 connect geared worm 2, and geared worm 2 drives 3 turns of worm gear Dynamic, the rotation of worm gear 3 drives screw rod 4 to rotate, and the rotation of screw rod 4 drives nut 5 to move axially, in addition, further including outer in the present embodiment Shell 6, outer tube 7, inner tube 8, the nut 5 are connect with inner tube 8, and shell 6 is connect with outer tube 7, and driving motor 1 is fixedly mounted on shell In 6, the axial movement of nut 5 is eventually exhibited as the axially opposing displacement between inner tube 8 and outer tube 7.

12 component of planetary gear is additionally provided in the present embodiment between worm gear 3 and screw rod 4, for details, reference can be made to Fig. 5 to Fig. 8, rows For 12 component of star gear for the transmission connection between worm gear 3 and screw rod 4,12 component of planetary gear includes ring gear 10, sun tooth 11, planetary gear 12, planet carrier 13 are taken turns, sun gear 11 is located in ring gear 10, and planetary gear 12 is engaged on 10 He of ring gear Between sun gear 11, while 12 axis rotation of planetary gear is mounted on planet carrier 13.Sun gear 11 in the present embodiment It is rotated synchronously with the worm gear 3, planet carrier 13 and screw rod 4 rotate synchronously, in the present embodiment between planet carrier 13 and screw rod 4 preferably It is to be connected by spline fitted, 12 component of planetary gear is additionally arranged between worm gear 3 and screw rod 4, passes through 12 component of planetary gear Transmission effect can reduce the revolving speed of worm gear 3, the torque of screw rod 4 be improved, so that screw rod 4 be allowed to have bigger thrust；

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 planetary gear 12 to rotate in ring gear 10, while the also corresponding rotation of planet carrier 13, due to planet carrier 13 with Screw rod 4 rotates synchronously, therefore finally realizes that screw rod 4 rotates；

Conversely, in the unreleased state, when driving motor 1 runs out of steam, and screw rod 4 is driven in the reverse direction, the row to be driven of screw rod 4 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 motionless situation, screw rod 4 cannot turn Dynamic, in other words, when driving motor 1 runs out of steam, screw rod 4 can not be rotated backward.

However in this case, when user needs that screw rod 4 can also be allowed reversely to turn when driving motor 1 runs out of steam 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, screw rod 4 is driven in the reverse direction, and 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 screw rod 4 also can be real Now it is freely rotated.

Therefore the present embodiment is the architectural characteristic that 12 component of planetary gear is utilized in fact, completes the release of linear actuators Function belongs to a kind of new structural framing, and 12 component of planetary gear quite in this present embodiment can be turned round as transmission is improved The effect of square, but also become one of part of relieving mechanism in linear actuators, it is needed relative to traditional relieving mechanism For wanting additional two shaft coupling components, relieving mechanism does not need two shaft coupling components in the present embodiment, because ring gear 10 exists While as a component in 12 component of planetary gear, the effect of shaft coupling component in relieving mechanism, i.e. internal tooth are also acted as Circle 10 can be completed at the same time two effects in the present embodiment, such structure design so that the internal structure of linear actuators more Step up to gather.

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 outer gear ring 15, the outer gear ring are also set up in the present embodiment 15 with ring gear 10 be to rotate synchronously, outer gear ring 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 outer gear ring 15, ring gear 10 can not be freely rotated, so as to pass through the rotatably mounted release function to realize linear actuators of control braking worm screw 14 Energy.

In the present embodiment, ring gear 10 and outer gear ring 15 are preferably integral structure, and ring gear 10 is in radially inner side, outer gear ring The step of 15 in radial outside, and integral structure eliminates ring gear 10 and the connection of outer gear ring 15, certainly, those skilled in the art Be readily apparent that between ring gear 10 and outer gear ring 15 can by be fixedly connected or spline fitted mode come realize rotate synchronously, this Class embodiment is each fallen in the protection scope of the utility model.

Brake is arranged to brake this structure of worm screw 14 by the present embodiment, and braking worm screw 14 first 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 There are also another effects: braking worm screw 14 is also used as an additional driving method to drive linear actuators, because When driving motor 1 runs out of steam, when rolling brake worm screw 3, braking worm screw 3 will drive outer gear ring 15 and accordingly 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 will drive planetary gear 12, Planet carrier 13 rotates together, and is equivalent to and will drive the rotation of screw rod 4, 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 driving method.

Driving braking worm screw 14 is rotated, further includes that the auxiliary for driving the braking worm screw 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 driving；Certainly auxiliary is driven Dynamic device is also possible to driven by shaking, i.e., braking worm screw 14 is driven 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 embodiments, 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, 16 pairs of braking worm screws of Brake torsion spring 14 are real It now holds tightly to lock braking worm screw 14, otherwise when the torsional spring inner ring of Brake torsion spring 16 expands, 16 pairs of braking snails of Brake torsion spring 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, the brake force of 16 pairs of Brake torsion spring braking worm screws 14 can become controllable, because drawing Device 18 is moved to the pulling force size of Brake torsion spring 16, determines the deflection size of Brake torsion spring 16, using this Modulatory character, is used 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, the specific connection structure of Brake torsion spring 16 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 for pedestal 17, can be an individual part, be also possible 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 drag-line to be 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 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, in sleeve 20, second pin 16b is first caught in from a slot of L-shaped groove 16 inner sleeve of Brake torsion spring, 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 It states roller bearing 19a and walking trough 21a sliding and is rotatably assorted.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, design pull rod 19 will not be interfered in rotation in this way, 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 reset 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.Benefit Components can not only 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 effect.

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 of braking worm screw 14, it is not limited to the Brake torsion spring 16 in the present embodiment, this Field technical staff is readily apparent that, can also be movably installed with coupling by the way of mechanical couplings grafting, such as 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 coupling plug-in unit cooperation, the coupling Plug-in unit insertion coupling socket is closed, 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 the protection scope of the utility model.

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 12 component of planetary gear is mounted in gear-box 25, and the braking worm screw 3 is rotatably installed in gear-box More stable in order to allow braking worm screw 14 to install in 25, two and half gear housing 25a are provided with for the braking installation of worm screw 14 Hole location 2501 is installed, so that braking 14 both ends of worm screw can realize positioning.

About package assembly of 12 component of planetary gear in gear-box 25, reference can be made to shown in Fig. 6 to Fig. 7, the present embodiment In improvement is also optimized to the package assembly of 12 component of planetary gear so that its assembling is more compact, volume is smaller, specifically It is as follows:

Linear actuators in the present embodiment further includes a support base 26, the tail drawing of the support base 26 and linear actuators 27 are fixedly connected, and support base 26 is located at the side that 12 component of planetary gear draws 27 towards tail, are set with first on institute's support base 26 The tail end of sliding sleeve 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 Above and it is axially positioned between the first limit stop ring 28a and planet carrier 13 or screw rod 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, more compact in structure for bearing, especially It is that radial space is 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 sliding sleeve by way of, 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 realizes assembling, more compact, the radial direction of the second sliding sleeve 31 in structure by the second sliding sleeve 31 Space is smaller.In addition, since sun gear 11, worm gear 3 are assembled in one by the first sliding sleeve 28, the second sliding sleeve 31 respectively simultaneously 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 available good guarantee of the concentricity of the two is same that is, 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 be equipped with prevent worm gear 3 towards tail end it is mobile the Two limit stop ring 31a, radial positioning and axially position can also be realized to worm gear 3 simultaneously 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 the sun gear 11 partially protrudes into Heart hole 3a, the worm gear 3 are equipped with the auxiliary baffle for preventing sun gear 11 mobile towards tail end direction, auxiliary gear at centre bore 3a Piece is the step structure being located in centre bore 3a, and specific structure can specifically be unfolded below, the end face of sun gear 11 and auxiliary Baffle offsets to form axially position, and in other words, the tail end of worm gear 3 is limited by the second limit stop ring 31a 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 more compact, and cost is lower, while being assembled also more square Just.

In addition, in the present embodiment screw rod 4 be with planet carrier 13 rotate synchronously, sun gear 11 with screw rod 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 screw rod 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 screw rod 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, Screw rod 4 is installed in mounting hole, and the friction pad 32 is axially positioned between sun gear 11 and screw rod 4.After the completion of positioning Schematic diagram can be found in Fig. 9.

In addition, for the assembling side between 12 component of planetary gear, worm gear 3,26 internal structure of support base and gear-box 25 Formula, the present embodiment are 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 12 component of planetary gear, the inner wall of the gear-box 25 is equipped with the first annular groove 2503, First 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 is installed in the first annular groove 2503, and such ring gear 10 is axially assembled on gear-box 25 by the first bulge loop 10a, together When can also be rotated on gear-box 25.

Certainly, preferably, in the present embodiment additional one between ring gear 10 and the inner wall of gear-box 25 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 groove 3301 of the first bulge loop 10a, the third sliding sleeve 33 is by two Half ring set 33a composition.

For screw rod 4, it is arranged with bearing outside the screw rod 4, specifically, it is to be sleeved on planet carrier 13 that bearing, which has half, On, the other half is sleeved on screw rod 4 by a bearing holder (housing, cover) 39, 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 allowing 12 assembly operating of planetary gear more stable, the present embodiment is to planetary gear 12 Component is correspondingly improved, specific as follows:

12 component of planetary gear further includes planetary gear retainer 34, and the planetary gear retainer 34 is equipped with the A positioning hole 34a and second location hole 34b, planetary gear retainer 34 connect by the way that second location hole 34b and planet carrier 13 are fixed It connects, 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 On, described 35 one end of planet wheel spindle is mounted on planet carrier 13, and the other end is mounted in first positioning hole 34a.

The present embodiment improves 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 of wheel shaft 35 is smaller, and 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, preferably it is arranged 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 end face of planetary gear 12 and the friction of planetary gear retainer 34, 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 contact, can effectively reduce contact area.

The planetary gear retainer 34 is equipped with the gear grooved 34d of accommodating planetary gear 12, more preferably to planetary gear 12 realizations are held in position.There are three planetary gear 12 is set as described in the present embodiment, the gear grooved 34d also phase Ying Yousan 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, being equipped with the shaft coupling of monodirectional locking, the connection of monodirectional locking between the worm gear 3 and screw rod 4 in the present embodiment Axis device can allow driving force normally to transmit when effect is normal direction driving rotation, conversely, when being driven in the reverse direction rotation, meeting Play the role of locking or prevention to driving force, be with playing in the present embodiment: when worm gear 3 is used as main driving When, it can normally drive screw rod 4 to be rotated, conversely, when screw rod 4 is as main driving then resistance can be played to the rotation of screw rod 4 Buddhist nun's effect, prevents screw rod 4 from continuing to rotate, 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 in the present embodiment to the shaft coupling of monodirectional locking Institute's Optimal improvements, the shaft coupling include transmission torsional spring 35 and the damping ring with the suit of transmission torsional spring 35,3 active of worm gear, screw rod 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 screw rod, screw rod 4 transmits torque to transmission torsional spring 35 and matches transmitting torsional spring 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 in size 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 specific 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 screw rod 4, and in the present embodiment, the second plectrum 37 is connected with sun gear 11 It connects, is sequentially connected to realize indirectly with screw rod 4, 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 set exists Outside transmission torsional spring 35, the bending pin 35a radial inward bending 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, i.e. the first plectrum 36 is that passively, the second plectrum 37 is active when transmission torsional spring 35 is reversed and stirs, 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 be interference fitted between the transmission torsional spring 35 and damping ring after radial extend out occurs, from And damping is generated, damping ring can prevent transmission torsional spring 35 from continuing to rotate at this time, and the second plectrum can be prevented by being also equivalent to damping ring 37 continue to rotate.

In other words, it when worm gear 3 is as main driving, can be rotated with normal driving screw rod 4, when screw rod 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 worm gear is set There is centre bore 3a, first plectrum 36 is along the first arc-like sheet that centre bore is circumferential to be set, and second plectrum 37 is the sun Along axial raised second arc-like sheet on gear 11, 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 baffle is acted as, is equivalent to, worm gear 3 is the to the auxiliary baffle 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, 35 sets of transmission torsional spring outside the circle wall, the bending pin 35a of transmission torsional spring 35 is installed in notch.This implementation More stable in order 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 components, more compact structure, while being also convenient for assembling.

Embodiment two

The difference between this embodiment and the first embodiment lies in a kind of pair of ring gear braking of embodiment is carried out using braking worm screw 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, the radial contraction or radial direction of the outer torsional spring of Lai Shixian ring gear extend out, when torsional spring outside ring gear When radial contraction, braking can be generated to ring gear, be the alternative to the brake of embodiment one kind.

Embodiment three

The difference between this embodiment and the first embodiment lies in the coupler structure of the monodirectional locking between worm screw and screw rod 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 cover to turn round in transmission 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, working 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, so that 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 to be separately provided a damping ring, damping ring on support base Preferably it is located between center pillar and collar wall.

Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to In this, being familiar with the those skilled in the art should be understood that the utility model includes but is not limited to attached drawing and specific embodiment party above Content described in formula.The modification of any function and structure principle without departing from the utility model is intended to be included in claims Range in.

Claims (21)

1. a kind of linear actuators, including driving motor, geared worm, worm gear, screw rod, nut, driving motor connection transmission snail Bar, geared worm drive worm gear rotation, and worm gear rotation drives screw rod rotation, and screw rod rotation drives nut axial movement, feature It is, further includes:

Planetary gear set, if between worm gear and screw rod, including ring gear, sun gear, planetary gear, planet carrier, the sun Gear and the worm gear rotate synchronously, and planet carrier and screw rod rotate synchronously；

Brake is freely rotated for generating braking to ring gear with limiting it.

2. linear actuators as described in claim 1, which is characterized in that the linear actuators further includes outer gear ring, described Outer gear ring and ring gear rotate synchronously, and the outer gear ring is engaged with braking worm screw.

3. linear actuators as claimed in claim 2, which is characterized in that the ring gear and outer gear ring are structure as a whole.

4. linear actuators as claimed in claim 2, which is characterized in that be set with Brake torsion spring outside the braking worm screw, institute It states Brake torsion spring to shrink torsional spring inner ring or expand torsional spring inner ring, to lock or unlock braking worm screw.

5. linear actuators as claimed in claim 4, which is characterized in that the linear actuators further includes pedestal and pulling Device, the Brake torsion spring include torsional spring main body, the first pin, second pin, and the torsional spring main body is sleeved on braking worm screw, the One pin is fixed, and second pin is pulled by puller on the base, and under puller pulling function, diameter occurs for the Brake torsion spring To contraction to hold the braking worm screw tightly.

6. linear actuators as claimed in claim 5, which is characterized in that be equipped with and draw between the puller and Brake torsion spring Bar, on the base, the second pin location and installation is on pull rod for the pull rod rotational installation.

7. linear actuators as claimed in claim 6, which is characterized in that the pull rod includes pull rod main body and sleeve, described Sleeve lining is equipped with the locating slot for positioning the second pin.

8. linear actuators as claimed in claim 6, which is characterized in that it is connected with sliding block between the pull rod and puller, The sliding block is slidably installed on the base, and the sliding block is equipped with walking trough, and the pull rod is equipped with roller bearing, the roller bearing and row It walks slot sliding and is rotatably assorted.

9. linear actuators as claimed in claim 4, which is characterized in that be equipped with and rub between braking worm screw and the Brake torsion spring Wipe set.

10. linear actuators as claimed in claim 2, which is characterized in that be movably installed with coupling on the linear actuators Plug-in unit, the coupling socket for braking worm screw and being equipped with coupling plug-in unit cooperation, the coupling plug-in unit insertion coupling socket, to hinder The only braking worm screw rotation.

11. linear actuators as claimed in claim 2, which is characterized in that the linear actuators further includes gear-box, described Planetary gear set is mounted in gear-box, and the braking worm screw is rotatably installed in gear-box.

12. linear actuators as claimed in claim 2, which is characterized in that the sun gear is located at the center of ring gear, too At least one planetary gear is engaged between positive gear and ring gear, the planetary gear is mounted on the planet carrier, described Planet carrier is fixedly connected with the screw rod.

13. linear actuators as claimed in claim 2, which is characterized in that the linear actuators further includes driving the system The auxiliary actuator of dynamic worm screw rotation, the auxiliary actuator are electric drive or driven by shaking.

14. linear actuators as described in claim 1, which is characterized in that the brake includes being sleeved on the ring gear The outer torsional spring of outer ring gear.

15. linear actuators as described in claim 1, which is characterized in that be equipped between the worm gear and sun gear unidirectional The shaft coupling of locking, the shaft coupling include transmission torsional spring and the damping ring with transmission torsional spring suit, worm gear active, sun gear Under driven state, worm gear transmitting torque to transmission torsional spring and makes transmission torsional spring and the damping ring clearance fit, and worm gear is driven, too Under positive gear active state, screw rod transmits torque to transmission torsional spring and makes to transmit torsional spring and damping ring interference fit.

16. linear actuators as claimed in claim 15, which is characterized in that the shaft coupling includes circumferentially spaced One plectrum, the second plectrum, the first plectrum with worm gear for connecting, and the second plectrum with sun gear for connecting, transmission torsional spring set On the first plectrum and the second plectrum, transmission torsional spring includes bending pin, and the bending pincard is mounted in the first plectrum and the Between two plectrums.

17. linear actuators as claimed in claim 16, which is characterized in that the transmission torsional spring is sleeved on the first plectrum and Outside two plectrums, the damping ring set is outside transmission torsional spring, the bending pin radial inward bending of transmission torsional spring, and the first plectrum is to biography When dynamic torsional spring transmitting torque, the bending pin screws direction towards transmission torsional spring and is struck.

18. linear actuators as claimed in claim 17, which is characterized in that the worm gear center is equipped with centre bore, and described the One plectrum is along the first arc-like sheet that centre bore is circumferential to be set, and second plectrum is on sun gear along axial raised second Arc-like sheet, second arc-like sheet pass through the centre bore and form notched round wall with the first arc-like sheet.

19. linear actuators as described in claim 1, which is characterized in that the linear actuators further includes being set to planet tooth The support base of wheel assembly tail end side, the first sliding sleeve is set on institute's support base, and the tail end of first sliding sleeve is equipped with the first limit Position retaining ring, the sun gear are sleeved on the first sliding sleeve and are axially positioned on first limit stop ring and planet carrier or screw rod Between.

20. linear actuators as claimed in claim 19, which is characterized in that the front end of the sun gear and planet carrier or silk Friction pad is equipped between bar.

21. linear actuators as claimed in claim 19, which is characterized in that the support base include center pillar and be located at center pillar week Collar wall outward, first sliding sleeve are sleeved on center pillar, and the second sliding sleeve, the worm gear set are set in the collar wall On the second sliding sleeve.