CN212115058U - Linear actuator with smooth clutch - Google Patents

Abstract

The utility model discloses a smooth and easy linear actuator of separation and reunion belongs to linear transmission technical field, including shell, transmission worm wheel, rotation lead screw and drive nut, the transmission worm wheel drives and rotates the lead screw and rotates, rotates the lead screw and rotates and drive nut along rotating lead screw axial displacement, be equipped with clutch between transmission worm wheel and the rotation lead screw, clutch includes but the coupling tooth cover of axial displacement for rotating the worm wheel, but rotate the lead screw overcoat and be equipped with the spacing external member of axial, the spacing external member of axial offsets with the shell axial, the spacing external member of axial keeps the location with the rotation lead screw in axial direction, when rotating the lead screw and receiving axial load, it passes through to rotate the lead screw the spacing external member of axial transmits axial force to the shell, do not transmit axial force on axial direction between coupling tooth cover and the spacing external member of axial. The utility model has the advantages of make clutch device smooth and easy degree when driven better.

Description

Linear actuator with smooth clutch

[ technical field ] A method for producing a semiconductor device

The utility model relates to a smooth and easy linear actuator of separation and reunion belongs to linear transmission technical field.

[ background of the invention ]

The linear actuator, also called electric push rod, is widely used in the fields of furniture, medical equipment, solar power generation and the like, and the main structure of the linear actuator comprises a driving motor, a transmission worm, a worm wheel, a screw rod and a nut.

In combination with the application environment of the linear actuator, when the linear actuator encounters a driving motor failure, or is in a power failure condition or needs to cut off power, a clutch device is added, and the clutch device is mainly used for cutting off the power between the driving motor and the rotating screw rod, so that reverse pushing can be realized in a mode of manually driving the rotating screw rod to rotate.

For the clutch device, the motive machine butt joint is realized by shifting one of the two components to move axially, and if the two components are subjected to axial force action, the shifting difficulty is influenced, so that the clutch device is unsmooth, poor in operation experience and even possibly damaged.

[ Utility model ] content

The utility model aims to solve the technical problem that overcome prior art not enough and provide a smooth and easy linear actuator of separation and reunion for clutch is smooth and easy degree when being driven better.

Solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a smooth and easy linear actuator of separation and reunion, includes shell, transmission worm wheel, rotates lead screw and drive nut, and the transmission worm wheel drives and rotates the lead screw and rotates, rotates the lead screw and rotates and drive nut along rotating lead screw axial displacement, be equipped with clutch between transmission worm wheel and the rotation lead screw, clutch includes the shaft coupling gear sleeve for rotating worm wheel axial displacement, it is equipped with the spacing external member of axial to rotate the lead screw overcoat, and the spacing external member of axial offsets with the shell axial, the spacing external member of axial keeps the location with the rotation lead screw in axial direction, when rotating the lead screw and receiving axial load, it passes through to rotate the lead screw the spacing external member of axial transmits axial force to the shell, do not transmit axial force on axial direction between shaft coupling gear sleeve and the spacing external member of axial.

Adopt the beneficial effects of the utility model:

the utility model provides a linear actuator, set up a clutch, this clutch mainly relies on the axial displacement of drive shaft coupling gear sleeve to realize, so to the shaft coupling gear sleeve, when the atress, the optimum is just receiving the power that comes from the drive component, avoid or reduce the axial force that comes from other parts as far as possible, in whole linear actuator, the axial force of other parts mainly comes from rotating the lead screw, it waits to promote the target through the drive nut promotion to rotate the lead screw, it can be with bearing capacity reaction to rotate the lead screw to wait to promote the target naturally, and if rotate the lead screw and transmit axial force to clutch's shaft coupling gear sleeve, that can make the user resistance grow when the shaft coupling gear sleeve is stirred in needs, long-term use still damages clutch easily.

Therefore, in the embodiment, the axial limiting sleeve is sleeved outside the rotary screw rod, the axial limiting sleeve is axially limited between the axial limiting sleeve and the rotary screw rod, and the axial limiting sleeve is axially limited with the shell.

Preferably, the linear actuator further comprises a first friction sleeve and a self-locking torsion spring sleeved outside the first friction sleeve, and the axial limiting sleeve comprises the first friction sleeve.

Preferably, the linear actuator further comprises a second friction sleeve, the first friction sleeve and the second friction sleeve are axially abutted, the second friction sleeve is sleeved with a release torsion spring, and the axial limiting sleeve comprises the first friction sleeve and the second friction sleeve.

Preferably, the first friction sleeve and the second friction sleeve are arranged axially side by side, and outer end faces of the first friction sleeve and the second friction sleeve are abutted.

Preferably, the second friction sleeve is sleeved outside the first friction sleeve, and the outer end surface of the first friction sleeve abuts against the inner end surface of the second friction sleeve.

Preferably, the second friction sleeve is provided with a bearing, the housing is provided with a bearing groove for mounting the bearing, and the bearing and the housing are axially limited.

Preferably, the first friction sleeve is arranged at the end part of the rotating screw rod, the shell comprises a tail slider arranged at the end part, and the tail slider and the second friction sleeve are axially limited.

Preferably, a spline sleeve is arranged between the rotary screw rod and the coupling gear sleeve, the spline sleeve and the first friction sleeve are axially limited, and the axial limiting sleeve comprises a spline sleeve, a first friction sleeve and a second friction sleeve.

Preferably, a tapered roller bearing is provided between the second friction sleeve and the tail slider.

Preferably, the linear actuator further comprises a hand-pulling releasing assembly, the hand-pulling releasing assembly further comprises a pull rod and a swing rod, the pull rod is axially movably arranged relative to the rotating screw rod, the swing rod is rotatably connected with the pull rod, and when the pull rod is pulled, the swing rod swings to axially push the coupling gear sleeve.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention will be further explained with reference to the drawings:

fig. 1 is a first overall schematic diagram of a linear actuator according to an embodiment of the present invention;

fig. 2 is a second overall schematic diagram of a linear actuator according to an embodiment of the present invention;

FIG. 3 is an exploded view of a linear actuator according to an embodiment of the present invention;

FIG. 4 is an enlarged partial view of a linear actuator according to an embodiment of the present invention;

FIG. 5 is an exploded view of the internal components of a linear actuator according to an embodiment of the present invention;

fig. 6 is an exploded view of a manual release device in a linear actuator according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a linear actuator hand-operated release device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a linear actuator according to a second embodiment of the present invention;

fig. 9 is a partially cut-away schematic view of a linear actuator according to a second embodiment of the present invention;

fig. 10 is a partially broken-away enlarged schematic view of a linear actuator according to a second embodiment of the present invention;

fig. 11 is an exploded view of the internal components of a linear actuator according to an embodiment of the present invention.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

In the following description, the terms "inside", "outside", "upper", "lower", "left", "right", and the like, which indicate orientations or positional relationships, are used to indicate orientations or positional relationships based on the drawings, and are only used for convenience in describing embodiments and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 7, this embodiment is a linear actuator, the linear actuator is also generally called a linear driver or an electric push rod, the linear actuator includes a housing, an outer tube 13, an inner tube 14, a driving motor 15, a transmission assembly, a rotating lead screw 20 and a transmission nut 21, the driving motor 15 drives the rotating lead screw 20 to rotate through the transmission assembly, the rotating lead screw 20 rotates to drive the transmission nut 21 to move axially along the rotating lead screw 20, the transmission nut 21 is fixedly connected with the inner tube 14, the transmission nut 21 drives the inner tube 14 to move axially relative to the outer tube 13 and the housing when moving axially, and the outer end of the inner tube 14 is connected to a target to be driven, and the linear actuator in this embodiment further includes:

the clutch device is arranged between the transmission assembly and the rotating screw rod 20 and is used for connecting or cutting off the power connection between the transmission assembly and the rotating screw rod 20;

the specific structure of the clutch device in this embodiment is as follows: the clutch device comprises a coupling gear sleeve 31, the coupling gear sleeve 31 is sleeved with the rotating screw rod 20 through a flat position, namely in the circumferential direction, the coupling gear sleeve 31 and the rotating screw rod 20 rotate synchronously, but the coupling gear sleeve 31 can move axially along the rotating screw rod 20 in the axial direction, the coupling gear sleeve 31 is provided with a plurality of tooth parts towards the direction of the transmission worm wheel 21, the end face of the transmission worm wheel 21 is provided with tooth grooves matched with the coupling gear sleeve 31 for transmission, when the coupling gear sleeve 31 is close to the transmission worm wheel 21, the tooth parts are inserted into the tooth grooves, the coupling gear sleeve 31 and the transmission worm wheel 21 realize synchronous rotation, when the coupling gear sleeve 31 is far away from the transmission worm wheel 21, the tooth parts are separated from the tooth grooves, the coupling gear sleeve 31 is separated from the transmission worm wheel 21, namely, the rotating screw rod 20 is in a power-free connection state. Referring to fig. 4, the coupling sleeve 31 is inserted into the worm wheel 21.

In this embodiment, the axial limiting sleeve is sleeved outside the rotary screw rod 20, the axial limiting sleeve is axially abutted against the housing, the axial limiting sleeve and the rotary screw rod 20 are kept positioned in the axial direction, when the rotary screw rod 20 is subjected to an axial load, the rotary screw rod 20 transmits an axial force to the housing through the axial limiting sleeve, and the axial force is not transmitted between the coupling gear sleeve 31 and the axial limiting sleeve in the axial direction.

The axial is spacing between the spacing external member of axial itself and the rotation lead screw 20, secondly the spacing external member of axial still carries out the axial spacing with the shell, such mounting means, make the axial force on the rotation lead screw can transmit for the shell through the spacing external member of axial, then do not transmit the axial force between shaft coupling gear sleeve 31 and the spacing external member of axial, so shaft coupling gear sleeve 31 just can not receive the axial force that comes from the rotation lead screw, the user will be very laborsaving when utilizing driving member to stir shaft coupling gear sleeve 31, the intensity requirement to shaft coupling gear sleeve 31 itself has also been reduced simultaneously, this also is favorable to prolonging clutch's life in addition.

In this embodiment, the linear actuator further includes a self-locking device, when the rotary screw 20 rotates reversely, a frictional resistance is generated on the rotary screw 20, and the self-locking device in this embodiment is configured as follows: the self-locking torsion spring comprises a first friction sleeve 41, a second friction sleeve 42, a release torsion spring 40 and a self-locking torsion spring 43, wherein the first friction sleeve 41 and the second friction sleeve 42 are respectively sleeved on a rotating screw rod 20, the first friction sleeve 41 and the rotating screw rod 20 are positioned through a flat position, namely, in the circumferential direction, the first friction sleeve 41 and the rotating screw rod 20 synchronously rotate, the second friction sleeve 42 freely rotates relative to the rotating screw rod 20, and in the axial direction, the axial end faces of the first friction sleeve 41 and the second friction sleeve 42 are abutted. Meanwhile, the release torsion spring 40 is sleeved on the second friction sleeve 42, the release torsion spring 40 is always tightly held by the second friction sleeve 42 in an initial state, and the first friction sleeve 41 is sleeved with a self-locking torsion spring 43.

Referring to fig. 4, when the inner tube 14 of the linear actuator extends to a predetermined position and has a retraction tendency, the rotary screw 20 receives an axial force, the rotary screw 20 receives the axial force and transmits the axial force to the first friction sleeve 41, the first friction sleeve 41 transmits the axial force to the second friction sleeve 42, the second friction sleeve 42 is sleeved with a second bearing 44, and the second bearing 44 axially limits with the limiting step 111 on the housing, so that the axial force is directly transmitted to the housing through the second bearing 44 on the second friction sleeve 42.

Therefore, based on the self-locking device in this embodiment, the first friction sleeve 41, the second friction sleeve 42 and the second bearing 44 in the self-locking device naturally form an axial limiting sleeve, and the rotating screw rod 20 directly transmits the axial force to the housing through the axial limiting sleeve. And because the position of whole clutch is in the rear end position of the spacing step 111 of shell, so in whole axial force transmission process, clutch itself does not receive the effect of axial force, under such environment, the user will be more laborsaving when stirring the coupling gear sleeve 31 among the clutch. Meanwhile, the clutch device is not subjected to axial force from the rotating screw rod 20, so that the service life of the clutch device can be greatly prolonged. Of course, it should be noted that, if there is no self-locking device in the linear actuator, a structure similar to a bushing may be additionally added to the rotary screw 20 to serve as an axial limiting sleeve.

In this embodiment, the first friction sleeve 41 preferably includes a front sleeve 411 and a rear sleeve 412, and the axial middle of the front sleeve 411 and the rear sleeve 412 is abutted by using a thrust bearing, and in other embodiments, the first friction sleeve 41 may be in the form of an integral sleeve.

The hand power release assembly comprises a first driving member and a second driving member, the first driving member is connected with the clutch device, the second driving member is used for being connected with the self-locking device, the hand power release assembly comprises an initial state and a complete release state, the clutch device is disconnected from power in the process from the initial state to the complete release state, and the second driving member drives the release torsion spring 40 to loosen.

The linear actuator in the embodiment is provided with the clutch device and the self-locking device, so that the linear actuator has more comprehensive functions, and the clutch device is combined with the self-locking device to have an advantage.

Secondly, the self-locking device in this embodiment also has a release torsion spring 40, that is, the self-locking device itself can be unlocked, when the release torsion spring 40 is loosened, the self-locking device is in an unlocked state, and the self-locking device hardly generates resistance to the rotating screw rod 20 no matter the linear actuator rotates in a forward direction or in a reverse direction, so that the linear actuator can be in a quick release state, that is, can retract quickly.

Finally, the linear actuator in this embodiment is provided with a hand-pulling releasing assembly, where the hand-pulling releasing assembly includes a first driving member and a second driving member, the first driving member and the second driving member are respectively used for driving the clutch device and the self-locking device, when the linear actuator needs to be quickly released, an operator operates the hand-pulling releasing assembly to make the hand-pulling releasing assembly in a completely released state, so that the clutch device can be in a disconnected state, and the self-locking device is in an unlocked state, so that a user can control the two devices by operating only one hand-pulling releasing assembly, which is very convenient to operate.

In this embodiment, the first driving member is mainly used for shifting the coupling gear sleeve 31 to move axially, and in order to enable the clutch device to reset after the first driving member is shifted, the clutch device further includes a return spring 32 generating an axial reset force to the coupling gear sleeve 31 in this embodiment, the end of the rotating screw 20 is provided with a limit end 201, the return spring 32 is sleeved on the rotating screw 20, and meanwhile, two ends of the return spring are limited between the limit end 201 and the coupling gear sleeve 31.

The housing in this embodiment includes an upper housing 11 and a lower housing 12, and a first bearing 33 is provided between the coupling sleeve 31 and the housing to reduce frictional resistance when the coupling sleeve 31 rotates.

Structure of the first driving member of the present embodiment: the first driving member comprises a swing rod 51 rotatably mounted on the housing, the hand pulling releasing assembly further comprises a pull rod 52 axially movably arranged relative to the rotating screw rod 20, the swing rod 51 is connected with the pull rod 52, during specific mounting, the upper end of the swing rod 51 is rotatably connected with the pull rod 52, the middle of the swing rod 51 is rotatably connected to the upper housing 11, the lower end of the swing rod 51 is connected with a shifting block 53, the shifting block 53 is relatively fixed with the coupling gear sleeve 31, specifically, in the embodiment, the shifting block 53 is connected with a first bearing 33 on the coupling gear sleeve 31, when the pull rod 52 is pulled, the swing rod 51 swings, and the corresponding shifting block 53 can push the coupling gear sleeve 31 to axially move.

When the inner tube 14 in the linear actuator is normally extended, the driving motor 15 drives the rotating screw rod 20 to rotate in the forward direction through the clutch device, and when the inner tube 14 is extended to a predetermined position, the driving motor 15 is stopped. When the inner tube 14 has a retraction tendency at this position, the axial end faces of the first friction sleeve 41 and the second friction sleeve 42 are abutted, and since the self-locking torsion spring 43 has a holding resistance function on the first friction sleeve 41, and the second friction sleeve 42 is also held tightly by the release torsion spring 40 in a normal state, after the end faces of the first friction sleeve 41 and the second friction sleeve 42 are abutted, a friction resistance is generated between the two, and the friction resistance generates a resistance for preventing the rotation of the rotary screw rod 20, so as to complete the self-locking force.

When the linear actuator needs to be retracted normally, the driving motor 15 drives the rotating screw rod 20 to rotate reversely through the clutch device, at this time, the rotating torque of the rotating screw rod 20 overcomes the self-locking force provided by the self-locking device, and the rotating screw rod 20 continues to rotate reversely, so that the transmission nut 21 drives the inner tube 14 to retract.

When the linear actuator extends to a predetermined position and needs to retract rapidly, the self-locking device can be unlocked in the embodiment to achieve the purpose of rapid release, the unlocking in the embodiment is mainly realized by the second driving member, and the specific structure is as follows: as shown in fig. 2 to 4, the second driving member includes a pushing block 54, the pushing block 54 is provided with a guiding surface 541, the release torsion spring 40 includes a pin 401 extending radially, in this embodiment, the pin 401 extends out of the top of the housing, the guiding surface 541 is provided on a side surface of the pushing block 54, the pushing block 54 is fixedly connected to the pull rod 52, that is, in this embodiment, the self-locking device and the clutch device share one pull rod 52, when the pull rod 52 is pulled, the guiding surface 541 on the pushing block 54 abuts against the pin 401, so that the release torsion spring 40 expands outward, when the release torsion spring 40 expands outward, the resistance between the release torsion spring 40 and the second friction sleeve 42 is correspondingly reduced, in this state, when the end surfaces of the first friction sleeve 41 and the second friction sleeve 42 abut against each other, the second friction sleeve 42 rotates synchronously with the first friction sleeve 41, so that the first friction sleeve 41 does not generate resistance to the rotating screw 20, thus, the purpose of no resistance of the rotary screw rod 20 is achieved, at the moment, if the clutch device is disconnected, and meanwhile, the self-locking device is unlocked, the rotary screw rod 20 is basically in a free idle state in the state, and the transmission nut 21 can be retracted quickly.

In addition, in the present embodiment, the guide surface 541 is adopted to gradually push the release torsion spring 40 in such a manner that the self-locking force is gradually reduced, so that the self-locking force does not disappear immediately, thereby achieving the purpose of stepless adjustment.

In order to better optimize the operation of the clutch device and the self-locking device, the operation sequence of the clutch device and the self-locking device is optimized in this embodiment, as shown in fig. 2, an adjusting slotted hole is provided on the pull rod 52, the push block 54 is fixed on the slotted hole through a fastening screw, the slotted hole is mainly designed to adjust the initial position of the push block 54, the initial position has two purposes, one is to compensate some actual assembly errors so that the push block 54 can more accurately abut against the release torsion spring 40, and the other is to adjust the operation sequence between the clutch device and the clutch device as described herein, as shown in fig. 2, in the initial state, the guide surface 541 of the push block 54 needs to move for a certain stroke to contact with the pin 401 of the release torsion spring 40, which can be understood as the idle stroke of the push block 54, and in the idle stroke, the clutch device is normally operated, the purpose that forms like this is that coupling gear sleeve 31 can be stirred earlier, when reseing simultaneously, is the auto-lock back of self-lock device elder generation, then clutch carries out power and links up again, and such benefit lies in when self-lock device produces from locking force after, the rotational speed of rotating lead screw 20 can reduce to make coupling gear sleeve 31 when engaging with transmission worm wheel 21, can not damage coupling gear sleeve 31 and transmission worm wheel 21, increase of service life greatly.

In addition, in order to enable a user to better sense the magnitude of the release amplitude, in this embodiment, the pull rod 52 is provided with the toothed bar 521, the housing is provided with the movable latch 522, the movable latch 522 is connected to a spring, when the pull rod 52 is pulled, the movable latch 522 is latched onto the toothed bar 521 one by one, and the position of the movable latch 522 on the toothed bar 521 can sense the pulling stroke of the pull rod 52.

It should be noted that, for the structures of the self-locking device and the clutch device, the structures shown in this embodiment are not limited, taking the self-locking device as an example, the self-locking device may only include a single third friction sleeve, the third friction sleeve rotates synchronously with the rotating lead screw, the release torsion spring is sleeved on the third friction sleeve, the release torsion spring is released to hug the third friction sleeve in an initial state to generate resistance to the rotating lead screw, which is equivalent to the release torsion spring being a self-locking torsion spring, and after the release torsion spring is pushed by the push block, the resistance of the release torsion spring to the third friction sleeve disappears, taking the clutch device as an example, and the clutch device may be implemented by the combination of other spline sleeves and splines. The following second embodiment also shows different embodiments of the self-locking device and the clutch device.

As shown in fig. 6 to 7, in order to further increase the releasing function of the linear actuator, the linear actuator in the present embodiment is connected with a front slider 16 at the end of the inner tube 14, and a hand-screw releasing device 17 is connected between the front slider 16 and the end of the inner tube 14. The powered engagement between the front slider 16 and the inner tube 14 can be cut off by means of a hand-operated release 17.

Specifically, the hand-operated releasing device 17 comprises a knob sleeve 171, a connecting sleeve seat 172 and a hand-operated releasing torsion spring 173, the connecting sleeve seat 172 is fixedly connected with the inner tube 14, the front slider 16 is sleeved with the connecting sleeve seat 172, the hand-operated releasing torsion spring 173 is arranged between the connecting sleeve seat 172 and the front slider 16, the hand-operated releasing torsion spring 173 is sleeved outside the front slider 16, meanwhile, the hand-operated releasing torsion spring 173 also has a corresponding pin 1731, the pin 401 penetrates through a gap in the connecting sleeve seat 172 and abuts against the knob sleeve 171, and when the knob sleeve 171 is rotated, the hand-operated releasing torsion spring 173 is used for stirring to radially contract or radially expand outwards, so that the friction resistance of the hand-operated releasing torsion spring 173 to the front slider 16 is controlled.

Example two:

as shown in fig. 8 to 11, the present embodiment is similar to the first embodiment in general operation principle, and mainly differs in specific structures of the self-locking device, the clutch device, the first driving member, and the second driving member.

The self-locking device of the embodiment: in the first embodiment, the first friction sleeve 41 and the second friction sleeve 42 are axially arranged side by side, the outer end surfaces of the first friction sleeve 41 and the second friction sleeve 42 are abutted, in this embodiment, the second friction sleeve 42 is sleeved outside the first friction sleeve 41, the outer end surface of the first friction sleeve 41 is abutted against the inner end surface of the second friction sleeve 42, as for the installation and the embodiment between the first friction sleeve 41 and the rotating screw rod 20, the first friction sleeve 41 still synchronously rotates with the rotating screw rod 20, meanwhile, the self-locking torsion spring 43 is sleeved outside the first friction sleeve 41, and the releasing torsion spring 40 is also sleeved outside the second friction sleeve 42, the working principle is similar to that of the first embodiment, that is, the self-locking force of the self-locking torsion spring 43 mainly comes from the end surface friction force of the first friction sleeve 41 and the second friction sleeve 42.

The first friction sleeve 41 in this embodiment has a similar structure to that in this embodiment, and also includes a front shaft sleeve 411 and a rear shaft sleeve 412, a thrust bearing is provided between the front shaft sleeve 411 and the rear shaft sleeve 412, the self-locking torsion spring 43 is simultaneously sleeved outside the front shaft sleeve 411 and the rear shaft sleeve 412, and the rear shaft sleeve 412 abuts against the inner end surface of the second friction sleeve 42.

The advantage of such a self-locking device is that the installation space is smaller, mainly that the axial space will be smaller, which is advantageous for reducing the volume of the entire linear actuator.

The clutch device of the embodiment: the clutch device in this embodiment further includes a spline housing 34, the spline housing 34 is located between the rotary screw 20 and the coupling gear housing 31, the spline housing 34 rotates synchronously with the rotary screw 20, torque transmission is realized mainly by the flat position between the spline housing 34 and the rotary screw 20, the coupling gear housing 31 and the transmission worm wheel 21 always keep synchronous rotation, and the first driving member mainly pushes the coupling gear housing 31 and the spline housing 34 to perform clutch.

In this embodiment, the first driving member is slightly different from the first driving member in that a shifting block 55 is adopted, the shifting block 55 is rotatably connected with the pull rod 52, and when the pull rod 52 is pulled, the shifting block 55 shifts the axial movement of the coupling gear sleeve 31.

The second driving member in this embodiment is directly integrated with the pull rod 52, and as shown in fig. 8, a guiding surface 541 is disposed on the pull rod 52.

Furthermore, in this embodiment, compared to the first embodiment, the hand-rotation releasing device 17 is eliminated.

The clutch device in this embodiment is similar to the embodiment in that the coupling sleeve itself is not subjected to the axial force from the rotary screw 20, and the axial force in this embodiment is transmitted as follows:

when the inner tube 14 of the linear actuator extends to a predetermined position and has a retraction tendency, the rotary screw 20 receives an axial force, the spline housing 34 abuts against a shoulder position of the rotary screw 20, so that the axial force of the rotary screw 20 is transmitted to the spline housing 34 at a first time, an end surface of the spline housing 34 abuts against an end surface of the first friction housing 41, that is, the spline housing 34 is axially limited by the first friction housing 41, so that the axial force is transmitted to the first friction housing 41, a tail end surface of the first friction housing 41 abuts against an inner end surface of the second friction housing 42, so that the axial force is transmitted to the second friction housing 42, and a tapered roller bearing 23 is arranged between the tail end surface of the second friction housing 42 and the tail slider 10, so that the axial force is finally transmitted to the tail slider 10 through the tapered roller bearing 23.

In the present embodiment, the spline housing 34, the first friction sleeve 41 and the second friction sleeve 42 together form an axial limiting sleeve, the rotary screw 20 transmits the axial force to the tail slider 10 through the axial limiting sleeve, and the coupling gear housing in the present embodiment is not subjected to the axial force all the time from the whole transmission process of the axial force, so that the first driving member is also very labor-saving when the coupling gear housing is shifted.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. The utility model provides a smooth and easy linear actuator of separation and reunion, includes shell, transmission worm wheel, rotates lead screw and drive nut, and the transmission worm wheel drives and rotates the lead screw rotation, rotates the lead screw and rotates and drive nut along rotating lead screw axial displacement, be equipped with clutch between transmission worm wheel and the rotation lead screw, a serial communication port, clutch includes but for rotating worm wheel axial displacement's shaft coupling tooth cover, it is equipped with the spacing external member of axial to rotate the lead screw overcoat, and the spacing external member of axial offsets with the shell axial, the spacing external member of axial keeps the location with the rotation lead screw in axial direction, when rotating the lead screw and receiving axial load, it passes through to rotate the lead screw the spacing external member of axial transmits axial force to the shell, do not transmit axial force on axial direction between shaft coupling tooth cover and the spacing external member of axial.

2. The clutched, smooth linear actuator of claim 1, further comprising a first friction sleeve and a self-locking torsion spring sleeved outside the first friction sleeve, wherein the axial stop sleeve comprises the first friction sleeve.

3. The clutched smooth linear actuator of claim 2, further comprising a second friction sleeve, wherein the first friction sleeve and the second friction sleeve are axially abutted, a release torsion spring is sleeved on the second friction sleeve, and the axial limiting sleeve comprises the first friction sleeve and the second friction sleeve.

4. A clutched smooth linear actuator as claimed in claim 3, wherein the first and second friction sleeves are arranged axially side by side with their outer faces abutting.

5. A smooth-clutched linear actuator as claimed in claim 3, wherein the second friction sleeve is sleeved over the first friction sleeve, the outer end face of the first friction sleeve abutting the inner end face of the second friction sleeve.

6. The clutched, smooth linear actuator of claim 4, wherein the second friction sleeve has a bearing mounted thereon, and the housing has a bearing groove for mounting the bearing thereon, the bearing being axially restrained from the housing.

7. The smoothly clutched linear actuator of claim 3, wherein the first friction sleeve is disposed at an end of the rotary screw, and the housing includes a tail slider disposed at the end, the tail slider being axially restrained from the second friction sleeve.

8. The clutched, smooth linear actuator of claim 7, wherein a spline housing is disposed between the rotary screw and the coupling sleeve, the spline housing is axially restrained from the first friction sleeve, and the axial restraint sleeve comprises the spline housing, the first friction sleeve and the second friction sleeve.

9. The clutched, smooth linear actuator of claim 7, wherein a tapered roller bearing is provided between the second friction sleeve and the tail slider.

10. The clutched smooth linear actuator of claim 1, further comprising a pull release assembly, wherein the pull release assembly further comprises a pull rod and a swing rod, the pull rod is axially movably disposed relative to the rotating lead screw, the swing rod is rotatably connected to the pull rod, and when the pull rod is pulled, the swing rod swings to axially push the coupling gear sleeve.

Images