CN210739294U - Self-locking device of linear actuator and linear actuator - Google Patents
Self-locking device of linear actuator and linear actuator Download PDFInfo
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- CN210739294U CN210739294U CN201921526940.9U CN201921526940U CN210739294U CN 210739294 U CN210739294 U CN 210739294U CN 201921526940 U CN201921526940 U CN 201921526940U CN 210739294 U CN210739294 U CN 210739294U
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Abstract
The utility model discloses a linear actuator's self-lock device belongs to linear actuating device field, including the one-way bearing and the friction lantern ring, the one-way bearing includes inner circle and outer lane, the inner circle is used for suit to linear actuator's rotation lead screw, the friction lantern ring with the outer lane is connected, self-lock device still including be used for with friction lantern ring complex friction piece rotates the lead screw when rotating along forward rotation, the outer lane does not rotate, when rotating the lead screw along reverse rotation, outer lane, inner circle, friction lantern ring rotate in step, contact in order to produce frictional force between the friction lantern ring and the friction piece. The utility model also discloses a linear actuator who adopts above-mentioned self-lock device. The utility model has the advantages of can increase linear actuator's self-locking ability.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a linear actuator's self-lock device and linear actuator belongs to linear actuating device field.
[ background of the invention ]
The linear actuator is widely applied to various fields at present, including electric lifting tables, electric beds, electric sofas and the like, and the structure of the linear actuator generally comprises a driving motor, a rotating lead screw and a transmission nut, wherein the driving motor drives the rotating lead screw to rotate, the transmission nut is driven to axially move when the rotating lead screw rotates, and the transmission nut can be connected with a driving object, so that the driving purpose is realized.
Taking electric lift table as an example, including the lift stand in the electric lift table at present, wherein include driving motor, rotation lead screw, transmission nut among the lift stand, transmission nut drives the pipe fitting and rises or descends, this kind of electric lift table is required to have self-locking function, does not have under the state of operation when the motor promptly, and the lift stand should possess self-locking function to prevent that the table from descending automatically. At present, the self-locking function of the lifting upright column on the market is mostly realized by a braking torsion spring, and the braking torsion spring is driven to tightly hold the lifting upright column to generate braking force when the rotating screw rod rotates reversely.
[ Utility model ] content
The present invention is to overcome the shortcomings of the prior art and provide a self-locking device and a linear actuator, which can increase the self-locking capability of the linear actuator.
Solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a self-lock device of linear actuator, includes one-way bearing and friction lantern ring, one-way bearing includes inner circle and outer lane, the inner circle is used for suit to linear actuator's rotation lead screw, the friction lantern ring with the outer lane is connected, self-lock device still including be used for with friction lantern ring complex friction piece, when rotating the lead screw and rotating along forward, the outer lane does not rotate, when rotating the lead screw along reverse rotation, outer lane, inner circle, friction lantern ring synchronous rotation, the friction lantern ring with the friction piece between contact in order to produce frictional force.
Adopt the beneficial effects of the utility model:
the utility model discloses in, self-lock device has adopted the cooperation structure of one-way bearing and friction sleeve ring, utilizes one-way bearing only one-way rotatable characteristic, when rotating the lead screw forward rotation, inner circle and outer lane in the one-way bearing are alternate segregation, be equivalent to a normal antifriction bearing, can not drive the outer lane when the inner circle rotates promptly and rotate, under this kind of state, the friction sleeve ring on the outer lane can not produce relative motion with the friction piece, just also can not produce frictional force, the rotation lead screw can normal operation.
And when the rotation lead screw is rotated reversely, the inner ring and the outer ring on the one-way bearing can be self-locked, so that the inner ring and the outer ring can synchronously rotate, the outer ring can drive the friction sleeve ring to rotate while rotating, the friction sleeve ring can move relative to the friction piece when rotating, so that friction force is generated, and the friction force can generate resistance on the rotation lead screw from the reverse action, namely, self-locking force is generated on the rotation lead screw.
Based on the structure, when the driving motor drives the rotating screw rod to rotate, the torsion of the driving motor is enough to overcome the self-locking force to enable the rotating screw rod to rotate reversely, so that when the driving motor is used for driving, the self-locking device does not influence the normal extension and retraction of the linear actuator; however, when the driving motor does not work and the rotating screw rod is used as a driving direction to rotate reversely, the rotating screw rod generates a movement trend of reverse rotation, the movement trend can cause a relative movement trend between the friction sleeve ring and the friction piece, but the friction force between the friction sleeve ring and the friction piece can prevent the movement trend, so that self-locking is completed.
And the utility model discloses this kind of self-lock device for original dependence torsional spring this kind of flexible auto-lock mode, the utility model discloses what rely on is that two relative comparatively rigid auto-lock modes of friction ring cover and friction part, its auto-lock power can be more stable, also can provide bigger auto-lock power simultaneously, also more secure on life.
Preferably, the friction collar and the friction member have a floating clearance in an axial direction of the rotary screw.
Preferably, the circumferential side part of the friction collar generates friction force with the friction piece; and/or the axial end part of the friction collar generates friction force with the friction piece.
The utility model also discloses a linear actuator, including first sleeve pipe, second sleeve pipe, rotation lead screw, drive nut, driving motor, the drive motor drive rotates the lead screw and rotates, drives drive nut axial displacement when rotating the lead screw and rotating, and drive nut removes and takes place relative flexible in order to drive first sleeve pipe and second sleeve pipe, install arbitrary one's self-lock device in the above-mentioned scheme on the rotation lead screw.
Preferably, the friction collar is sleeved on the outer ring, the rotating screw rod is further provided with a plane bearing, and the plane bearing and the friction piece are located on two different axial sides of the friction collar.
Preferably, the linear actuator further comprises a support base, the support base is axially far away from the plane bearing, the friction piece comprises a friction outer ring installed in the support base, the friction outer ring is sleeved outside the friction ring sleeve, and the friction outer ring is in contact with the circumferential side part of the friction ring sleeve to generate friction force.
Preferably, the circumferential side wall of the friction ring sleeve is an external conical surface, the conical surface is gradually reduced towards one side far away from the plane bearing, and the inner side wall of the friction outer ring is an internal conical surface matched with the external conical surface; or the circumferential side surface of the friction ring sleeve is a step surface, and the inner side wall of the friction outer ring is matched with the step surface.
Preferably, the linear actuator further comprises a support base axially remote from the planar bearing, and the friction member comprises a friction pad mounted in the support base, the friction pad being in frictional contact with an axial end of the friction collar.
Preferably, a step part is arranged on the rotating screw rod, and the plane bearing is axially positioned on the step part.
Preferably, the support base is provided with a base inner cavity, the friction piece is installed in the base inner cavity, the friction ring sleeve is at least partially embedded in the base inner cavity, a radial support piece is arranged between the friction ring sleeve and the wall of the base inner cavity, and the radial support piece is a bearing or a support ring.
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 schematic overall structure diagram of a linear actuator according to an embodiment of the present invention;
fig. 2 is an exploded view of a linear actuator according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
fig. 4 is a schematic cross-sectional view of a linear actuator according to an embodiment of the present invention;
FIG. 5 is an enlarged schematic view at B in FIG. 4;
fig. 6 is an exploded schematic view of a self-locking device according to a second embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a self-locking device according to a second 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 for convenience in describing embodiments and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example one
As shown in fig. 1 to 5, the application of the self-locking device in the linear actuator is shown, the linear actuator has various types, such as a lifting column, such as an electric push rod, etc., the self-locking device of this embodiment is specifically applied to a lifting column, which is generally used in an electric lifting table, and therefore is also generally called a lifting table leg, the lifting column can be driven by a driving motor 11 to ascend and descend, so as to ascend and descend a table top, for such an electric lifting table, the driving motor 11 is normally used to drive the lifting column to ascend and descend, but once the driving motor 11 does not work or is in an abnormal power failure condition, the lifting column itself needs to have a certain self-locking function to prevent the table top from descending automatically when bearing a large load, so the lifting column of the existing electric lifting table generally needs to have a self-locking device, the existing self-locking device of the lifting upright post is usually a torsion spring brake.
In the embodiment, as shown in fig. 2 and 3, the self-locking device includes a one-way bearing 21 and a friction collar 22, the one-way bearing 21 includes an inner ring 211 and an outer ring 212, the one-way bearing 21 is a relatively common product in the mechanical field, and not described herein too much, the inner ring 211 of the one-way bearing 21 is used for being sleeved on a rotary screw rod 10 of a linear actuator, the friction collar 22 is connected with the outer ring 212, the self-locking device further includes a friction member 23 used for being matched with the friction collar 22, when the rotary screw rod 10 rotates in a forward direction, the outer ring 212 does not rotate, when the rotary screw rod 10 rotates in a reverse direction, the outer ring 212, the inner ring 211 and the friction collar 22 rotate synchronously, and the friction collar 22 and the friction member 23 are in contact to generate a friction force.
In this embodiment, the self-locking device adopts the matching structure of the one-way bearing 21 and the friction collar 22, and utilizes the characteristic that the one-way bearing 21 only has one-way rotation, when the rotary screw 10 rotates in the forward direction, the inner ring 211 and the outer ring 212 in the one-way bearing 21 are separated from each other, which is equivalent to a normal rolling bearing, i.e. the inner ring 211 does not drive the outer ring 212 to rotate when rotating, in this state, the friction collar 22 on the outer ring 212 does not generate relative motion with the friction piece 23, and thus no friction force is generated, and the rotary screw 10 can normally operate.
When the rotary screw rod 10 rotates reversely, the inner ring 211 and the outer ring 212 on the one-way bearing 21 can be self-locked, so that the inner ring 211 and the outer ring 212 rotate synchronously, the outer ring 212 rotates and simultaneously drives the friction sleeve ring 22 to rotate, the friction sleeve ring 22 rotates and generates relative motion with the friction piece 23, so that friction force is generated, and the friction force can generate resistance on the rotary screw rod 10 from the reverse action, namely generate self-locking force on the rotary screw rod 10.
Based on the structure, when the driving motor 11 drives the rotary screw rod 10 to rotate, the torque force of the driving motor 11 is enough to overcome the self-locking force to enable the rotary screw rod 10 to rotate reversely, so when the driving motor 11 is used for driving actively, the self-locking device does not influence the normal extension and retraction of the linear actuator; however, when the driving motor 11 is not operated and the rotary screw 10 is used as a driving direction to perform reverse rotation, the rotary screw 10 generates a motion trend of reverse rotation, the motion trend can cause a relative motion trend between the friction collar 22 and the friction piece 23, but the friction force between the two can prevent the motion trend, so that the self-locking is completed. Combine to the lift stand, when driving motor 11 normal drive, the normal lift of lift stand can be realized, and when driving motor 11 was out of work, under this self-lock power of self-lock device, the load on the electric lift table was not enough to drive the decline of lift stand.
Moreover this kind of self-lock device of this embodiment, for original flexible auto-lock mode that relies on the torsional spring, the utility model discloses what rely on is that two relative comparatively rigid auto-lock modes of friction lantern ring 22 and friction piece 23, its auto-lock power can be more stable, also can provide bigger auto-lock power simultaneously, also more secure in life.
In order to reduce the resistance of the self-locking device to the rotary spindle 10 when the drive motor 11 is used as an active drive, the friction collar 22 and the friction element 23 have a floating play in the axial direction of the rotary spindle 10. The axial directions referred to herein are all referenced to the axial direction of the rotating screw 10. Because there is the floating clearance between friction lantern ring 22 and the friction piece 23 in the axial direction, the existence of this floating clearance for the frictional force between friction lantern ring 22 and the friction piece 23 can be influenced by the axial force and change, when both axial direction atresss are great, the floating clearance between friction lantern ring 22 and the friction piece 23 diminishes, the contact is tighter, thereby make the frictional force bigger, and when the axial direction atress between the two is less, the frictional force is less, alright come self-control auto-lock power size according to the actual size of bearing of lift table so. Specifically, referring to fig. 5, since the rotary screw 10 has an axial movement gap during the actual assembly, when the lifting table moves up and down, the rotary screw 10 has a slight play in the axial direction, and the axial play of the rotary screw 10 drives the friction collar 22 to axially approach the friction member 23 or axially move away from the friction member 23, so as to adjust the floating gap between the friction collar 22 and the friction member 23.
The friction force between the friction collar 22 and the friction member 23 can be achieved by various embodiments, in this embodiment, it is preferable that the friction force is generated between the axial end portion of the friction collar 22 and the friction member 23, as shown in fig. 3 to 5, the friction member 23 is a friction pad in this embodiment, the friction collar 22 is sleeved on the rotating screw 10, the friction pad is above the friction collar 22, and the top surface of the friction collar 22 contacts with the bottom surface of the friction pad, so as to generate the friction force.
Furthermore, in the present embodiment, a plane bearing 24 is preferably further provided, and the plane bearing 24 is also sleeved on the rotary screw 10 and sleeved on the axial lower side of the friction collar 22, that is, the plane bearing 24 and the friction piece 23 are located on two different axial sides of the friction collar 22, so that when the rotary screw 10 rotates relative to the friction collar 22, the friction force is smaller, that is, when the rotary screw 10 rotates forward under the driving of the driving motor 11, the friction collar 22 and the upper ring 241 of the plane bearing 24 both remain stationary, and the rotary screw 10 and the lower ring 242 of the plane bearing 24 rotate together.
For the convenience of assembly, in this embodiment, a supporting base 25 is provided, the supporting base 25 is far away from the planar bearing 24 in the axial direction, the friction pad is installed in the supporting base 25, in addition, a step 101 is provided on the rotating screw 10, and the planar bearing 24 is axially positioned on the step 101, so that the planar bearing 24, the friction collar 22, the one-way bearing 21, and the friction pad in this embodiment are all installed between the step 101 and the supporting base 25, the axial positioning is completed, when the rotating screw 10 receives an axial force, the step 101 transmits the axial force to the planar bearing 24, and then the planar bearing 24 transmits the axial force to the friction collar 22, and finally the friction collar 22 abuts against the friction pad to generate a friction force.
For better stability of the self-locking device of this embodiment, the supporting base 25 is provided with a base inner cavity 251, the friction member 23 is installed in the base inner cavity 251, the friction collar 22 is at least partially embedded in the base inner cavity 251, the radial support member 26 is arranged between the friction collar 22 and the wall of the base inner cavity 251, the radial support member 26 is a bearing or a supporting ring, in this embodiment, the radial support member 26 is preferably a bearing, so that the one-way bearing 21, the friction collar 22, and the friction gasket are substantially integrated with the supporting base 25, and a good positioning effect is achieved in both radial and axial directions, and the stability is better.
Example two
As shown in fig. 6 and 7, the present embodiment is different from the first embodiment in that the friction member 23 and the friction collar 22 generate friction force by end contact, and in the present embodiment, the friction member 23 and the friction collar 22 generate friction force by circumferential side of the friction collar 22 and the friction member 23.
In this embodiment, the friction member 23 includes a friction outer ring installed in the support base 25, in this embodiment, since the support base 25 includes a base inner cavity 251, the friction outer ring may be installed in an interference fit manner with the wall of the base inner cavity 251, of course, in other embodiments, other fixed connection manners may be adopted, the friction outer ring is sleeved outside the friction collar 22, and the friction outer ring and the circumferential side portion of the friction collar 22 are in contact to generate friction force.
Preferably, the circumferential side wall of the friction collar 22 is an outer tapered surface 221, the tapered surface tapers away from the flat bearing 24, and the inner side wall of the friction outer ring is an inner tapered surface adapted to the outer tapered surface, as shown in fig. 7. Like the embodiment, the rotating screw rod 10 has an axial float space, the circumferential side wall of the friction sleeve 22 is set to be the outer conical surface 221, when the rotating screw rod 10 applies an axial force to the friction sleeve 22, the circumferential side wall of the friction sleeve 22 and the inner side wall of the friction outer ring can form an effect that the friction is tighter and tighter, that is, the axial force is larger, the friction force is larger, the axial force is small, or the circumferential side surface of the friction sleeve is a step surface, and the inner side wall of the friction outer ring is matched with the step surface, so that the friction force is relatively smaller.
Furthermore, in this embodiment the radial support 26 is preferably a support ring, which may be a plastic collar, which is more cost-effective with respect to the bearing.
It should be noted that, the structure and shape of the circumferential side wall of the friction collar 22 are not limited to the outer conical surface 221 in this embodiment, and in other embodiments, the shape and structure may be changed to some extent, for example, a step surface may also be adopted, when a step surface structure is adopted, the combination of the circumferential side friction force and the end surface friction force is realized to some extent, and other irregular shapes may also be adopted in the same way, and these embodiments also fall within the protection scope of the present invention.
EXAMPLE III
As also shown in fig. 1 to 5, the present embodiment is a linear actuator, and as described above, the linear actuator of the present embodiment is preferably a lifting column, and the present embodiment includes a first sleeve 31, a second sleeve 32, a rotating lead screw 10, a transmission nut, and a driving motor 11, where the driving motor 11 drives the rotating lead screw 10 to rotate, and when the rotating lead screw 10 rotates, the transmission nut is driven to move axially, and the transmission nut moves to drive the first sleeve 31 and the second sleeve 32 to relatively extend and retract.
The lifting column in this embodiment is preferably a three-section lifting column, in which the first sleeve 31, the second sleeve 32, the rotary screw 10, the transmission nut, the driving motor 11, etc. form a transmission assembly, the lifting column further includes an inner tube 41, a middle tube 42, and an outer tube 43, and the transmission assembly drives the inner tube 41, the middle tube 42, and the outer tube 43 to move telescopically relative to each other. The working principle of such a three-section lifting column is disclosed in detail in the previous application and is not described in any greater detail here.
In addition, the linear actuator may be the lifting column shown in the embodiment, or may be an electric push rod used in an electric driving device.
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 self-locking device of the linear actuator is characterized by comprising a one-way bearing and a friction sleeve ring, wherein the one-way bearing comprises an inner ring and an outer ring, the inner ring is used for being sleeved on a rotating lead screw of the linear actuator, the friction sleeve ring is connected with the outer ring, the self-locking device further comprises a friction piece matched with the friction sleeve ring, when the rotating lead screw rotates along the forward direction, the outer ring does not rotate, when the rotating lead screw rotates along the reverse direction, the outer ring, the inner ring and the friction sleeve ring synchronously rotate, and the friction sleeve ring and the friction piece are in contact to generate friction force.
2. The self-locking device of claim 1, wherein the friction collar and friction member have a floating clearance in an axial direction of the rotating screw.
3. The self-locking device of claim 1, wherein the circumferential side of the friction collar generates a frictional force with the friction member; and/or the axial end part of the friction collar generates friction force with the friction piece.
4. A linear actuator comprises a first sleeve, a second sleeve, a rotating screw rod, a transmission nut and a driving motor, wherein the driving motor drives the rotating screw rod to rotate, the transmission nut is driven to move axially when the rotating screw rod rotates, the transmission nut moves to drive the first sleeve and the second sleeve to relatively extend and retract, and the self-locking device of claim 1 or 2 is mounted on the rotating screw rod.
5. The linear actuator of claim 4, wherein the friction collar is fitted over the outer race, and the rotary screw further has a flat bearing mounted thereon, the flat bearing and friction member being located on two different axial sides of the friction collar.
6. The linear actuator of claim 5, further comprising a support base axially remote from the planar bearing, the friction element including a friction outer race mounted within the support base, the friction outer race being fitted over the friction collar, the friction outer race being in contact with a circumferential side of the friction collar to generate the frictional force.
7. The linear actuator of claim 6, wherein the circumferential side wall of the friction collar is an outer tapered surface that tapers away from the flat bearing, and the inner side wall of the friction outer race is an inner tapered surface that mates with the outer tapered surface; or the circumferential side surface of the friction ring sleeve is a step surface, and the inner side wall of the friction outer ring is matched with the step surface.
8. The linear actuator of claim 5, further comprising a support base axially remote from the planar bearing, the friction member including a friction pad mounted in the support base, the friction pad frictionally interacting with an axial end of the friction collar.
9. The linear actuator of claim 5, wherein the rotary screw has a step on it, the planar bearing being axially positioned on the step.
10. The linear actuator of claim 6 or 8, wherein the support base is provided with a base cavity, the friction element is mounted in the base cavity, the friction collar is at least partially embedded in the base cavity, and a radial support is provided between the friction collar and the wall of the base cavity, the radial support being a bearing or a support ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921526940.9U CN210739294U (en) | 2019-09-12 | 2019-09-12 | Self-locking device of linear actuator and linear actuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921526940.9U CN210739294U (en) | 2019-09-12 | 2019-09-12 | Self-locking device of linear actuator and linear actuator |
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| Publication Number | Publication Date |
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| CN210739294U true CN210739294U (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921526940.9U Active CN210739294U (en) | 2019-09-12 | 2019-09-12 | Self-locking device of linear actuator and linear actuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116771874A (en) * | 2023-08-16 | 2023-09-19 | 康辉医疗科技(苏州)有限公司 | Lifting type anti-reversing transmission device with screw rod |
-
2019
- 2019-09-12 CN CN201921526940.9U patent/CN210739294U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116771874A (en) * | 2023-08-16 | 2023-09-19 | 康辉医疗科技(苏州)有限公司 | Lifting type anti-reversing transmission device with screw rod |
| CN116771874B (en) * | 2023-08-16 | 2023-11-14 | 康辉医疗科技(苏州)有限公司 | Lifting type anti-reversing transmission device with screw rod |
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