CN210686890U - One-way self-locking device and linear actuator with same - Google Patents
One-way self-locking device and linear actuator with same Download PDFInfo
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- CN210686890U CN210686890U CN201920959540.0U CN201920959540U CN210686890U CN 210686890 U CN210686890 U CN 210686890U CN 201920959540 U CN201920959540 U CN 201920959540U CN 210686890 U CN210686890 U CN 210686890U
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Abstract
The utility model relates to an one-way self-lock device and have this one-way self-lock device's linear actuator, this one-way self-lock device, including first damping part and second damping part, have meshed one-way skewed tooth on first damping part and the second damping part, one of them side flank of tooth of one-way skewed tooth is the inclined plane, this inclined plane of one-way skewed tooth is used for producing outside axial force between first damping part and second damping part when first damping part is rotatory towards specific direction, this axial force is used in the outer tip of first damping part and/or second damping part and the friction pair that external friction spare constitutes, realizes the friction auto-lock. A linear actuator is provided with the one-way self-locking device, and a first damping part of the one-way self-locking device is in driving connection with a rotating part of the linear actuator. The utility model has the advantages that: the damping device has the advantages of automatic compensation of the friction loss, long service life and stable and reliable output one-way damping.
Description
Technical Field
The utility model relates to an one-way self-lock device and have this one-way self-lock device's linear actuator.
Background
In the modern office environment, due to the consideration to health and comfortableness, the office table, the computer table, the conference table and the like are required to have a lifting function, office workers can adjust the height of the table top according to the height and the sitting posture of the office workers, the comfortableness is improved, or the office workers directly stand to work, and the office workers are favorable for relieving the fatigue and the strain of the neck and the waist. The desk with the adjustable height at least comprises 2 lifting columns, and in the actual use process, if the lifting columns are not provided with reliable self-locking mechanisms, the lifting columns can slowly slide downwards under the action of desktop loads to cause unbalanced inclination of the desktop and more serious collapse of the desktop, so that the improvement of the self-locking reliability becomes a technical difficulty that products must overcome at the present stage.
In chinese patent document CN100425874C an actuator, in particular a linear actuator, is disclosed comprising a reversible motor driving an adjustment member by means of a transmission. In order to increase the self-locking capacity of the actuator, the actuator is provided with a self-locking spring, one end of which is fixed to the rotating part of the actuator so that the self-locking spring is entrained in the direction of rotation on the cylindrical part, where it is in a relatively stationary state. When the motor is switched off, the load on the actuator tries to move the adjustment member and the movement of the self-locking spring is prevented, whereby the self-locking spring tightens around the cylindrical part.
The common self-locking spring with the structure can only provide smaller torque to compensate smaller self-locking force, can only relieve the shortage of the self-locking force but can not eliminate the hidden trouble caused by the shortage of the self-locking force, has high processing precision requirement and relatively complex installation process, and can generate self-locking force attenuation after the self-locking spring operates for many times, so that the self-locking force is greatly reduced, and the reliability of the lifting column is poor.
Chinese patent document CN108466994A discloses a transmission device and a lifting column, wherein the lifting column of the patent document provides an extra self-locking force and improves the braking effect by additionally adding a braking torsion spring on the basis of a braking torsion spring. But still can not avoid the technical problem that the self-locking spring can produce the decay of self-locking force after many times of operation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: and the self-locking reliability is improved.
The utility model provides a technical scheme that its technical problem adopted is: a one-way self-locking device is characterized in that: the friction self-locking device comprises a first damping part and a second damping part, wherein unidirectional helical teeth are arranged on the first damping part and the second damping part, the first damping part and the second damping part are coaxially and rotatably arranged and are mutually meshed through the unidirectional helical teeth, one side tooth surface of each unidirectional helical tooth is an inclined surface, the inclined surface of each unidirectional helical tooth is used for generating outward axial force between the first damping part and the second damping part when the first damping part rotates towards a specific direction, and the axial force acts on a friction pair formed by the outer end part of the first damping part and/or the second damping part and an external friction part to realize friction self-locking.
Further, the outer end face and/or the side face of the second damping member and the outer member constitute a friction pair for generating an initial rotational resistance to the second damping member.
Further limiting, the tooth surface of one side of the unidirectional bevel gear is an inclined surface, the tooth surface of the other side of the unidirectional bevel gear is a vertical surface, or the two tooth surfaces of the unidirectional bevel gear are inclined surfaces inclined in the same direction.
It is further defined that the unidirectional helical teeth are located on adjacent end faces of the first damping member and the second damping member, or the unidirectional helical teeth are located on adjacent side faces of the first damping member and the second damping member.
Further, the first damping part is provided with a shaft structure, and the second damping part is sleeved on the shaft structure of the first damping part in a coaxial and rotating mode.
A linear actuator is provided with the one-way self-locking device, and a first damping part of the one-way self-locking device is in driving connection with a rotating part of the linear actuator.
The linear actuator is further limited to comprise a driving shell and a screw rod driving device, a driving end of the screw rod driving device penetrates through the driving shell to be in driving connection with a motor in the driving shell, a first damping part and a second damping part are sleeved on the driving end of the screw rod driving device and located on the outer side of the driving shell, the first damping part is in driving connection with the driving end, and axial force generated when the first damping part rotates towards a specific direction acts on a friction pair formed by the outer end part of the second damping part and the outer side of the driving shell to achieve friction self-locking.
Further, the first damping part is in driving connection with the driving end through an internal and external spline structure.
Further, the outer side of the driving shell is provided with a damper box, the second damping part is arranged in the damper box, and the side face of the second damping part and the damper box form a friction pair.
Further limiting, the side surface of the second damping part is sleeved with a damping sleeve which is used for forming a friction pair with the damper box; or the damping sleeve is arranged on the damper box and is used for forming a friction pair with the side surface of the second damping part.
Further inject, the drive end cover is equipped with the bearing, first damping part, second damping part is by supreme setting down on the drive end, the drive shell outside has the install bin, two sections upper and lower mounting holes have in the install bin, two sections mounting holes divide into the bearing box of upside attenuator case and downside with the install bin, first damping part and second damping part set up in the mounting hole of attenuator case, the bearing sets up in the mounting hole of bearing box, have the step between the mounting hole of bearing box and attenuator case, go on spacing up to the bearing, the lower part of the mounting hole of bearing box has the draw-in groove, install the circlip in the draw-in groove, it is spacing down to the bearing.
The utility model has the advantages that: the damping device has the advantages of automatic compensation of the friction loss, long service life and stable and reliable output one-way damping.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the forward rotation operation of the unidirectional damping device of the present invention.
Fig. 2 is a schematic diagram of the operation of the unidirectional damping device of the present invention during reverse rotation.
Fig. 3 is an exploded view of the one-way damping device of the present invention.
Fig. 4 is a sectional view of the linear actuator according to the present invention in an exploded state.
Fig. 5 is a cross-sectional view of the tissue state of the linear actuator of the present invention.
In the figure, 1, a first damping part, 1-1, a shaft structure, 2, a second damping part, 3-1, a tooth surface, 4, a driving shell, 5, a screw rod driving device, 5-1, a screw rod, 6-1, a damper box, 6-2, a bearing box, 7, a bearing, 8, an elastic retainer ring, 9, an external friction piece, 10, a coupler driven piece, 11, a screw and 12, and a damping sleeve.
Detailed Description
A one-way self-locking device comprises a first damping part 1 and a second damping part 2, wherein one-way skewed teeth are arranged on the first damping part 1 and the second damping part 2, the first damping part 1 and the second damping part 2 are coaxially and rotatably arranged and are meshed with each other through the one-way skewed teeth, one side tooth surface of each one-way skewed tooth is an inclined surface, the inclined surface of each one-way skewed tooth is used for generating outward axial force between the first damping part 1 and the second damping part 2 when the first damping part 1 rotates towards a specific direction, and the axial force acts on a friction pair formed by the outer end part of the second damping part 2 and an external friction part 9 to realize friction self-locking. Specifically, the unidirectional skewed teeth are positioned on the adjacent end surfaces of the first damping part 1 and the second damping part 2, one side tooth surface 3-1 of the unidirectional skewed teeth is an inclined surface, and the other side tooth surface 3-1 is a vertical surface, as shown in fig. 3.
The working principle of the one-way self-locking device will be described below with reference to fig. 1, 2 and 3, and the rotation in a specific direction will be specifically referred to as a reverse rotation.
In fig. 2, the first damping member 1 rotates in the opposite direction and is not movable in the axial direction, the acting tooth surfaces of the unidirectional helical teeth of the first damping member 1 and the second damping member 2 are inclined surfaces, the inclined surfaces convert the rotation power of the first damping member 1 into outward axial force between the first damping member 1 and the second damping member 2, the axial force drives the second damping member 2 to generate axial displacement and contact with the external friction member 9 to form a friction pair with the external friction member 9, and meanwhile, the axial force acts on the friction pair formed by the outer end of the second damping member 2 and the external friction member 9 to generate great friction self-locking damping, so that the friction self-locking of the unidirectional damping device is realized.
In fig. 1, when the first damping part 1 rotates forward, the acting tooth flanks of the unidirectional helical teeth of the first damping part 1 and the second damping part 2 are vertical surfaces, the vertical surfaces do not convert the rotary power of the first damping part 1 into axial force, the unidirectional helical teeth drive the second damping part 2 to overcome the initial rotary resistance to rotate together, and the unidirectional damping device is in a non-self-locking state.
A friction pair for generating an initial rotational resistance to the second damping member 2 is provided between the second damping member 2 and the external member. The initial rotational resistance is used for overcoming the frictional force between the acting tooth surfaces of the unidirectional skewed teeth when the first damping part 1 rotates reversely, so that the second damping part 2 cannot rotate reversely along with the first damping part 1 under the action of the frictional force between the acting tooth surfaces of the unidirectional skewed teeth, and the acting tooth surfaces cannot convert the rotational power of the first damping part 1 into outward axial force.
In the embodiment of fig. 4, the initial rotational resistance is generated by friction between the side surface of the second damping member 2 and the damper case 6-1. Certainly, the initial rotation resistance is generated only by the inertia of the second damping part; alternatively, the outer end face of the second damping member 2 and the external friction member 9 constitute a friction pair to generate an initial rotational resistance; or simultaneously, the inertia of the second damping member itself, the outer end face of the second damping member 2 and the external friction member 9 form a friction pair, and the side face of the second damping member 2 and the external friction member 9 form a friction pair, so that the initial rotation resistance is generated.
In fig. 1, 2 and 3, the axial force drives the second damping part to move axially and contact the external friction part 9, and the second damping part and the external friction part 9 form a friction pair, and meanwhile, the axial force acts on the friction pair to generate large friction self-locking damping, so that friction self-locking of the one-way damping device is realized. Certainly, the axial position of the second damping part is not moved, and the axial force drives the first damping part to axially move and contact the external friction part 9 to generate large friction self-locking damping, so that friction self-locking of the one-way damping device is realized; or the first damping part 1 and the second damping part 2 are axially separated together and form a friction pair with the external friction piece 9 on one side of each damping part, so that friction self-locking is realized.
In fig. 1, 2 and 3, one side tooth flank 3-1 of the one-way skewed tooth is a bevel, and the other side tooth flank 3-1 is a vertical face. Certainly, the two tooth surfaces 3-1 of the unidirectional helical teeth are inclined planes inclined in the same direction, when the first damping part 1 rotates forwards, an inward axial force is generated between the first damping part 1 and the second damping part 2, the second damping part 2 is prompted to be separated from the external friction part 9, and the self-locking state is released.
In fig. 1, 2 and 3, the unidirectional helical teeth are located on the adjacent end faces of the first damping part 1 and the second damping part 2. Of course, the unidirectional helical teeth can also be located on the adjacent sides of the first damping part 1 and the second damping part 2.
As shown in fig. 4 and 5, a specific application of the one-way self-locking device is specifically applied to a linear actuator, the linear actuator comprises a driving shell 4 and a lead screw driving device 5, a driving end of the lead screw driving device 5 penetrates through the driving shell 4 to be in driving connection with a motor in the driving shell 4, and the driving end of the lead screw driving device 5 is provided with the one-way self-locking device. In fig. 4 the driving end of the screw driving means 5 is the end of the screw 5-1.
The unidirectional self-locking device comprises a first damping part 1 and a second damping part 2, unidirectional helical teeth are arranged on the first damping part 1 and the second damping part 2, the first damping part 1 and the second damping part 2 are coaxially and rotatably arranged and are meshed with each other through the unidirectional helical teeth, one side tooth surface of each unidirectional helical tooth is an inclined surface, the inclined surface of each unidirectional helical tooth is used for generating outward axial force between the first damping part 1 and the second damping part 2 when the first damping part 1 rotates towards a specific direction, and the axial force acts on a friction pair formed by the outer end part of the second damping part 2 and an external friction part 9 to realize friction self-locking. Specifically, the unidirectional helical teeth are positioned on the adjacent end surfaces of the first damping part 1 and the second damping part 2, one side tooth surface 3-1 of the unidirectional helical teeth is an inclined surface, and the other side tooth surface 3-1 of the unidirectional helical teeth is a vertical surface. The unidirectional helical teeth are located on the adjacent end surfaces of the first damping part 1 and the second damping part 2.
The first damping part 1 and the second damping part 2 are sleeved on the driving end of the screw rod driving device 5 and are positioned on the outer side of the driving shell 4, the first damping part 1 is provided with a shaft structure 1-1, and the second damping part 2 is sleeved on the shaft structure 1-1 of the first damping part 1 and coaxially and rotatably arranged. The first damping part 1 is in driving connection with the driving end through an internal and external spline structure, and axial force generated when the first damping part 1 rotates towards a specific direction acts on a friction pair formed by the outer end part of the second damping part 2 and the outer side of the driving shell 4, so that friction self-locking is realized.
The driving end is sleeved with a bearing 7, the first damping part 1 and the second damping part 2 are arranged on the driving end from bottom to top, the outer side of the driving shell 4 is provided with an installation box, an upper installation hole and a lower installation hole are formed in the installation box, the installation box is divided into an upper damper box 6-1 and a lower bearing box 6-2 by the two installation holes, the first damping part 1 and the second damping part 2 are arranged in the installation hole of the damper box 6-1, and a damping sleeve 12 is arranged in the damper box 6-1 and used for forming a friction pair with the side face of the second damping part 2 to generate initial rotation resistance. The bearing 7 is arranged in a mounting hole of the bearing box 6-2, a step is arranged between the bearing box 6-2 and the mounting hole of the damper box 6-1 to limit the bearing 7 upwards, a clamping groove is arranged at the lower part of the mounting hole of the bearing box 6-2, an elastic check ring 8 is arranged in the clamping groove to limit the bearing 7 downwards, and a shaft sleeve is sleeved between the bearing 7 and the driving end. The damping sleeve 12 is made of nylon and is fixedly installed in the damper box 6-1 in a bonding mode, and the first damping part 1 and the second damping part 2 are made of metal or plastic and the like. It is of course not excluded that the damping sleeve 12 forms a friction pair with the second damping part 2.
In fig. 4 and 5, the first damping part 1 is in driving connection with the drive end via an internal and external spline structure. It is not excluded that the first damping part 1 is fixed directly on the driving end by means of a fastener; or the first damping part 1 is directly fixed on the driving end in an injection molding mode to realize the fixation with the driving end.
In fig. 4 and 5, a motor in a driving shell 4 is in driving connection with a driving end through a coupler, a worm wheel is arranged on a coupler driving part, a worm is arranged on an output shaft of the motor, the worm drives the coupler driving part to rotate through the worm wheel, the coupler driving part and a coupler driven part 10 are in meshing transmission through claws, the coupler driven part 10 is sleeved on the head of the driving end and is installed through a screw and a screw hole of the head of the driving end, the coupler driven part 10 and the head of the driving end are in transmission through an internal and external spline structure, the driving end is axially limited through a bearing 7, a step on the driving end and the coupler driven part 10, and the bearing 7 is not excluded, the diameter of the driving shaft is axially limited through a second damping part 1 and a driven part of the coupler, and the outer side; or the bearing 7 is replaced by a sleeve. The drive housing and the motor and shaft coupling within the drive housing are prior art in fig. 4 and 5, so only the local structure relevant to the present invention is shown.
In fig. 4 and 5, the one-way self-locking device is located at the driving end of the screw rod driving device 5, which does not exclude that the first damping part 1 is arranged on other rotating parts of the linear actuator, the first damping part is driven by the rotating parts, such as an output shaft of a motor, even a rotating shaft which is driven by a gear transmission mechanism and rotates synchronously with the motor or the screw rod can be additionally arranged in the linear actuator, and the one-way self-locking device is arranged on the rotating shaft.
Claims (11)
1. A one-way self-locking device is characterized in that: comprises a first damping part (1) and a second damping part (2), wherein the first damping part (1) and the second damping part (2) are provided with one-way helical teeth, the first damping part (1) and the second damping part (2) are coaxially and rotatably arranged and are meshed with each other through the one-way helical teeth,
one side tooth surface of the unidirectional helical tooth is an inclined surface, the inclined surface of the unidirectional helical tooth is used for generating outward axial force between the first damping part (1) and the second damping part (2) when the first damping part (1) rotates towards a specific direction,
the axial force acts on a friction pair formed by the outer end part of the first damping part (1) and/or the second damping part (2) and an external friction piece (9) to realize friction self-locking.
2. A one-way self-locking device according to claim 1, wherein: the outer end face and/or the side face of the second damping part (2) and an external part form a friction pair for generating initial rotation resistance to the second damping part (2).
3. A one-way self-locking device according to claim 1, wherein: the tooth surface (3-1) on one side of the unidirectional skewed tooth is an inclined surface, the tooth surface (3-1) on the other side of the unidirectional skewed tooth is a vertical surface, or the two tooth surfaces (3-1) of the unidirectional skewed tooth are inclined surfaces inclined in the same direction.
4. A one-way self-locking device according to claim 1, wherein: the one-way helical teeth are positioned on the adjacent end surfaces of the first damping part (1) and the second damping part (2),
or the unidirectional helical teeth are positioned on the adjacent side surfaces of the first damping part (1) and the second damping part (2).
5. A one-way self-locking device according to claim 1, wherein: the first damping part (1) is provided with a shaft structure (1-1), and the second damping part (2) is sleeved on the shaft structure (1-1) of the first damping part (1) and coaxially and rotatably arranged.
6. A linear actuator, characterized by: with a unidirectional locking device according to claim 1, 2, 3, 4 or 5, the first damping part (1) of the unidirectional locking device is in driving connection with the rotating part of the linear actuator.
7. The linear actuator of claim 6, wherein: including drive shell (4) and lead screw drive arrangement (5), the drive end of lead screw drive arrangement (5) passes drive shell (4) and is connected with the motor drive in drive shell (4), first damping part (1) and second damping part (2) suit are on the drive end of lead screw drive arrangement (5), and be located the outside of drive shell (4), first damping part (1) is connected with the drive end drive, the axial force that produces when first damping part (1) is rotatory towards specific direction is used in the friction pair that the outer tip of second damping part (2) and the outside of drive shell (4) constitute, realize the friction auto-lock.
8. The linear actuator of claim 7, wherein: the first damping part (1) is in driving connection with the driving end through an internal and external spline structure.
9. The linear actuator of claim 7, wherein: the outer side of the driving shell (4) is provided with a damper box (6-1), the second damping part (2) is arranged in the damper box (6-1), and the side surface of the second damping part (2) and the damper box (6-1) form a friction pair.
10. The linear actuator of claim 9, wherein: the side surface of the second damping part (2) is sleeved with a damping sleeve (12) which is used for forming a friction pair with the damper box (6-1); or the damping sleeve (12) is arranged on the damper box (6-1) and is used for forming a friction pair with the side surface of the second damping part (2).
11. The linear actuator of claim 7, wherein: the driving end is sleeved with a bearing (7), the first damping part (1) and the second damping part (2) are arranged on the driving end from bottom to top,
the outer side of the driving shell (4) is provided with an installation box, an upper installation hole and a lower installation hole are formed in the installation box, the installation box is divided into a damper box (6-1) on the upper side and a bearing box (6-2) on the lower side by the two installation holes, the first damping part (1) and the second damping part (2) are arranged in the installation holes of the damper box (6-1), the bearing (7) is arranged in the installation hole of the bearing box (6-2), a step is arranged between the bearing box (6-2) and the installation hole of the damper box (6-1) to limit the bearing (7) upwards, a clamping groove is formed in the lower portion of the installation hole of the bearing box (6-2), and an elastic check ring (8) is arranged in the clamping groove to limit the bearing (7) downwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920959540.0U CN210686890U (en) | 2019-06-24 | 2019-06-24 | One-way self-locking device and linear actuator with same |
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| CN201920959540.0U CN210686890U (en) | 2019-06-24 | 2019-06-24 | One-way self-locking device and linear actuator with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332292A (en) * | 2019-06-24 | 2019-10-15 | 常州市凯迪电器股份有限公司 | Unidirectional self-lock device and linear actuators with the unidirectional self-lock device |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332292A (en) * | 2019-06-24 | 2019-10-15 | 常州市凯迪电器股份有限公司 | Unidirectional self-lock device and linear actuators with the unidirectional self-lock device |
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