CN215521832U

CN215521832U - Friction self-locking device with one-way adjustable damping

Info

Publication number: CN215521832U
Application number: CN202120280491.5U
Authority: CN
Inventors: 黄立先; 朱更兴; 黄东升
Original assignee: Changzhou Kaidi Electrical Co Ltd
Current assignee: Changzhou Kaidi Electrical Co Ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2022-01-14
Anticipated expiration: 2031-02-01

Abstract

The utility model relates to the technical field of lifting mechanisms, in particular to a friction self-locking device with unidirectional adjustable damping. The resistance assembly and the connecting transmission assembly are respectively arranged on the upper side and the lower side of the driving end, and a one-way part is arranged on the inner side of the connecting transmission assembly and is coaxially arranged with the resistance assembly. The present invention can provide the friction force directionally. The device does not increase extra friction force when moving in the forward direction, and can provide friction force for forming self-locking force when moving in the reverse direction or in a stop state, so that the efficiency and the reliability of the whole system are improved. The integral structure is integrated with the motor, the overall dimension of the original motor is not increased, the structure is simplified, the motor can be transplanted to other equipment, and the motor is irrelevant to the form of linear driving equipment and has strong compatibility.

Description

Friction self-locking device with one-way adjustable damping

Technical Field

The utility model relates to the technical field of lifting mechanisms, in particular to a friction self-locking device with unidirectional adjustable damping.

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 height-adjustable table comprises at least two lifting self-locking mechanisms.

Patent 202010707559.3 proposes a good solution, by designing the drive legs and the motor of the lifting column as independent modules, the motor can automatically recognize and configure the corresponding driving program when being connected with the controller, thereby achieving the requirement of not replacing the drive legs and the control box, and realizing different performances only by replacing different motors.

For the electric lifting table, the relevant standards of the office table must be met. The lifting table can keep self-locking at any position and does not slide down is an important index. The common adopted solution is to provide a self-locking mechanism, and for a lifting upright post of a heavy load, the required thrust in the lifting direction and the resistance in the descending direction are large, so that the self-locking mechanism is required to realize a low resistance drag force in the lifting direction and a sufficient resistance force in the descending direction, and meet the self-locking force of the heavy load. The self-locking mechanism is limited by the same power of the same control box, the driving force of the motor is much smaller for the high-speed lifting upright column, and the rising and falling retardation force of the self-locking mechanism is required to be much smaller than that of the self-locking mechanism of the heavy-load upright column. The self-locking mechanism is arranged on the driving screw rod part, obviously, the requirement of blocking force of modular configuration of heavy load and high speed can not be met simultaneously, and the self-locking mechanism is arranged on the motor, so that the problem can be solved well.

The friction self-locking mechanism that patent 201920637914.7 provided utilizes the loading force of gravity direction to produce the friction drag power when descending, and the bigger the load is from the corresponding increase of locking power, fine solution from the not enough problem of locking power, but it is lower to rise transmission efficiency. Patent EP662573B1 discloses a self-locking structure using a brake spring, the rising direction does not generate a blocking force, the falling direction generates a sufficient blocking force, and the disadvantage is that the blocking force generated by the spring clasping is thermally attenuated, which causes instability of the self-locking force, and is limited by the space size, and the lifting of the self-locking force is limited.

The existing lifting friction self-locking mechanism can not well solve the problems of insufficient self-locking force, low lifting transmission efficiency, limited self-locking mechanism space, attenuation of retarding force of the self-locking mechanism, incapability of adapting to different use conditions, incapability of adjusting the retarding force and the like.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a friction self-locking device with unidirectional adjustable damping.

The technical scheme for realizing the purpose of the utility model is as follows: the friction self-locking device comprises a resistance assembly, a connection transmission assembly and a driving assembly, wherein the resistance assembly and the connection transmission assembly are sleeved at the driving end of the driving assembly and rotate along with the driving assembly, the resistance assembly and the connection transmission assembly are respectively arranged on the upper side and the lower side of the driving end, a one-way component is arranged on the inner side of the connection transmission assembly and coaxially arranged with the resistance assembly, and the damping value of the resistance assembly is adjustable.

Further, the resistance assembly and the connecting transmission assembly are connected through a transmission shaft.

Furthermore, the resistance assembly comprises an upper friction plate, a middle friction plate, a lower friction plate and a friction piece base which are sequentially sleeved on the transmission shaft from top to bottom, the middle friction plate is tightly pressed between the upper friction plate and the lower friction plate, and the middle friction plate rotates along with the transmission shaft.

Furthermore, the upper friction plate and the lower friction plate are respectively fixed with the friction piece base in a radial locking mode.

Furthermore, an annular groove is formed in the friction piece base, and an elastic element used for compensating pressure loss of the resistance assembly after abrasion is arranged in the annular groove.

Furthermore, connect transmission assembly and include from the top down suit in proper order worm wheel and connecting piece on the transmission shaft, the inboard lower part of worm wheel with be provided with between the transmission shaft one-way part, the worm wheel with the connecting piece is through setting up the spline groove of the inboard lower part of worm wheel and setting up and being in the spline meshing on connecting piece outside upper portion meets.

Furthermore, steel sleeves are arranged among the friction piece base, the upper part of the inner side of the worm wheel and the transmission shaft.

Furthermore, the driving assembly is arranged on the side face of the friction piece base and comprises a driving motor and a worm arranged on the output end of the driving motor, and the worm is meshed with the worm wheel and used for driving the connecting transmission assembly to rotate.

Furthermore, a plurality of screw mounting holes which are uniformly distributed in an annular manner are formed in the upper friction plate, screw mounting columns corresponding to the screw mounting holes are arranged on the upper end surface of the friction piece base, and the upper friction plate and the friction piece base are fixed through screws; the bottom end of the lower friction plate is provided with limit columns which are uniformly distributed in an annular mode, and the upper end face of the friction piece base is provided with limit grooves matched with the limit columns.

Further, the one-way component is a one-way bearing, and the elastic element is a disc spring.

After the technical scheme is adopted, the utility model has the following positive effects:

(1) the present invention can provide the friction force directionally. The device does not increase extra friction force when moving in the forward direction, and can provide friction force for forming self-locking force when moving in the reverse direction or in a stop state, so that the efficiency and the reliability of the whole system are improved.

(2) The utility model has the advantages that the whole structure is integrated with the motor, the appearance size of the original motor is not increased, the structure is simple, the motor can be transplanted to other equipment, the motor is irrelevant to the form of linear driving equipment, and the compatibility is strong.

(3) The damping value of the device is adjustable, the pressing force of the device is adjusted by adjusting the pressing gap between the upper friction plate and the friction piece base, different damping can be set according to different requirements, and the applicability is high.

(4) The utility model can reduce the self-locking force of the worm gear and improve the transmission efficiency of the worm gear and the worm.

(5) The elastic element is used for compensating the pressure loss of the friction plate after micro abrasion, so that the pressure value of the middle friction plate is stabilized within a certain range.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which

FIG. 1 is an exploded view of the structure of the present invention;

FIG. 2 is a schematic view of the overall structure of the present invention;

FIG. 3 is a top view of the present invention;

fig. 4 is a cross-sectional view of fig. 3A-a.

Detailed Description

Referring to fig. 1 to 4, the damping device comprises a resistance assembly 1, a connecting transmission assembly 2 and a driving assembly 3, wherein the resistance assembly 1 and the connecting transmission assembly 2 are sleeved at the driving end of the driving assembly 3 and rotate along with the driving end, the resistance assembly 1 and the connecting transmission assembly 2 are respectively arranged at the upper side and the lower side of the driving end, a one-way component 4 is fixedly arranged at the inner side of the connecting transmission assembly 2 and is coaxially arranged with the resistance assembly 1, and the damping value of the resistance assembly 1 is adjustable. The one-way component 4 is a one-way bearing, and the resistance component 1 and the connecting transmission component 2 are connected through a transmission shaft 5.

The resistance assembly 1 comprises an upper friction plate 101, a middle friction plate 102, a lower friction plate 103 and a friction piece base 104 which are sequentially sleeved on the transmission shaft 5 from top to bottom, wherein the middle friction plate 102 is tightly pressed between the upper friction plate 101 and the lower friction plate 103, and the middle friction plate 102 rotates along with the transmission shaft 5. The upper friction plate 101 and the lower friction plate 103 are respectively fixed with the friction piece base 104 in a radial locking mode. The friction member base 104 is provided with an annular groove, an elastic element 105 for compensating pressure loss after the resistance assembly 1 is worn is arranged in the annular groove, and the elastic element 105 is a disc spring. The pressure compensation device is used for compensating the pressure loss of the friction plate after micro abrasion, so that the pressure value of the middle friction plate 102 is stabilized in a certain range. A plurality of screw mounting holes 101a which are uniformly distributed in a ring shape are formed in the upper friction plate 101, screw mounting columns 104a corresponding to the screw mounting holes 101a are arranged on the upper end face of the friction piece base 104, and the upper friction plate 101 and the friction piece base 104 are fixed through screws; the intermediate friction plate 102 is pressed, and a frictional force is generated between the intermediate friction plate 102 and the upper and lower friction plates when the intermediate friction plate rotates. The bottom end of the lower friction plate 103 is provided with limit posts 103a which are uniformly distributed in an annular shape, and the upper end surface of the friction piece base 104 is provided with limit grooves 104b which are matched with the limit posts 103 a. The center of the middle friction plate is provided with a groove matched with the end part of the transmission shaft 5, and the groove is used for transmitting the torque generated by the middle friction plate 102. The one-way bearing and the transmission shaft 5 do not rotate relatively, and torque is transmitted between the one-way bearing and the transmission shaft.

Connecting drive assembly 2 includes that from the top down suit is on transmission shaft 5 worm wheel 201 and connecting piece 202 in proper order, is provided with one-way part 4 between the inboard lower part of worm wheel 201 and transmission shaft 5, and it is spacing through the shape between one-way part 4 and the worm wheel 201 for one-way part 4 does not have radial motion. The worm wheel 201 and the connecting piece 202 are meshed and connected with each other through a spline groove arranged at the lower part of the inner side of the worm wheel 201 and a spline arranged at the upper part of the outer side of the connecting piece 202, relative rotation does not exist between the worm wheel 201 and the connecting piece 202, and torque is transmitted between the worm wheel 201 and the connecting piece 202. The connecting transmission component 2 is connected with external linear driving equipment to transmit torque.

A steel sleeve 6 is arranged between the friction piece base 104, the upper part of the inner side of the worm wheel 201 and the transmission shaft 5.

The driving component 3 is arranged on the side surface of the friction piece base 104 and comprises a driving motor 301 and a worm 302 arranged on the output end of the driving motor 301, and the worm 302 is meshed with the worm wheel 201 and is used for driving the connecting transmission component 2 to rotate.

The resistance assembly 1 may also be a friction assembly, an oil pressure damper, an air damper, or the like, which may provide the same resistance effect.

The working principle of the utility model is as follows:

adjusting friction force and pretightening force: the magnitude of the frictional force is determined on the one hand by the contact pressure between the upper friction plate 101 and the friction element base 104. The larger the hold-down gap, the larger the deformation between the upper friction plate 101 and the base plate 104, and thus the larger the frictional force. On the other hand, the friction piece base 104 is provided with a disc spring, and the pretightening force can be adjusted by adjusting parameters such as the material, the thickness and the height of the disc spring, so that the friction force value is adjusted.

Forward motion (the direction of motion is the column ascending direction): the worm 302 rotates the worm wheel 201 → the connection 202 → outputs to the linear drive device. When the one-way bearing moves in the forward direction, the one-way bearing and the worm wheel 201 rotate together, the inner ring of the one-way bearing is fixed, and no torque is transmitted, so that no additional friction force exists.

Reverse motion (motion direction is the column descending direction): the worm 302 rotates the worm wheel 201 → the connection 202 → outputs to the linear drive device. Meanwhile, the transmission path of the friction force is resistance component 1 → transmission shaft 5 → one-way bearing outer ring, one-way bearing inner ring and worm wheel 201 rotate together → connecting part 202 → output to the linear driving device. The moment of the worm wheel 201 and the worm 302 is superimposed with the friction force of the resistance assembly 1.

The resistance component 1 consisting of the upper friction plate 101, the middle friction plate 102, the lower friction plate 103, the transmission shaft 5 and the disc spring generates friction force, and the resistance component 1 and the end cover are radially restricted and cannot rotate relatively.

The resistance assembly 1 is connected with a one-way bearing through a transmission shaft 5. When the linear drive moves upwards, the driving motor 301 moves forwards, the one-way bearing does not transmit torque, and the resistance component 1 does not move.

On the contrary, when the linear driving apparatus moves downward, the driving motor 301 moves reversely. Meanwhile, the one-way bearing is tightly held with the transmission shaft 5, the friction force of the transmission shaft 5 is transmitted to the worm wheel 201, and the transmission shaft and the driving motor 301 overcome the torsion force generated by gravity together, so that the self-locking force is improved.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a friction self-lock device of one-way adjustable damping which characterized in that: the damping device comprises a resistance component (1), a connecting transmission component (2) and a driving component (3), wherein the resistance component (1) and the connecting transmission component (2) are sleeved at the driving end of the driving component (3) and rotate unidirectionally therewith, the resistance component (1) and the connecting transmission component (2) are respectively arranged at the upper side and the lower side of the driving end, a unidirectional part (4) is arranged at the inner side of the connecting transmission component (2) and is coaxially arranged with the resistance component (1), and the damping value of the resistance component (1) is adjustable; the resistance assembly (1) comprises an upper friction plate (101), a middle friction plate (102), a lower friction plate (103) and a friction piece base (104), wherein the upper friction plate (101), the middle friction plate (102), the lower friction plate (103) and the friction piece base (104) are sequentially sleeved on the transmission shaft (5) from top to bottom, the upper friction plate (101) and the lower friction plate (103) tightly press the middle friction plate (102) between the upper friction plate and the lower friction plate, and the middle friction plate (102) rotates along with the transmission shaft (5).

2. The friction self-locking device with one-way adjustable damping according to claim 1, characterized in that: the resistance assembly (1) is connected with the connecting transmission assembly (2) through a transmission shaft (5).

3. The friction self-locking device with one-way adjustable damping according to claim 1, characterized in that: the upper friction plate (101) and the lower friction plate (103) are respectively fixed with the friction piece base (104) in a radial locking mode.

4. A friction self-locking device with one-way adjustable damping according to any one of claims 1 or 3, characterized in that: an annular groove is formed in the friction piece base (104), and an elastic element (105) used for compensating pressure loss after the resistance assembly (1) is worn is arranged in the annular groove.

5. The friction self-locking device with one-way adjustable damping according to claim 1, characterized in that: connect drive assembly (2) and include from the top down suit in proper order worm wheel (201) and connecting piece (202) on transmission shaft (5), worm wheel (201) inboard lower part with be provided with between transmission shaft (5) unidirectional part (4), worm wheel (201) with connecting piece (202) are through setting up spline groove and the setting of worm wheel (201) inboard lower part are in spline meshing meets on connecting piece (202) outside upper portion.

6. The friction self-locking device with one-way adjustable damping according to claim 5, characterized in that: and a steel sleeve (6) is arranged between the friction piece base (104), the upper part of the inner side of the worm wheel (201) and the transmission shaft (5).

7. The friction self-locking device with one-way adjustable damping according to claim 5, characterized in that: the driving assembly (3) is installed on the side face of the friction piece base (104), and comprises a driving motor (301) and a worm (302) installed on the output end of the driving motor (301), wherein the worm (302) is meshed with the worm wheel (201) and used for driving the connecting transmission assembly (2) to rotate.

8. A friction self-locking device with one-way adjustable damping according to claim 3, characterized in that: a plurality of screw mounting holes (101a) are annularly and uniformly distributed in the upper friction plate (101), screw mounting columns (104a) corresponding to the screw mounting holes (101a) are arranged on the upper end face of the friction piece base (104), and the upper friction plate (101) and the friction piece base (104) are fixed through screws; the bottom end of the lower friction plate (103) is provided with annular and uniformly distributed limiting columns (103a), and the upper end face of the friction piece base (104) is provided with limiting grooves (104b) matched with the limiting columns (103 a).

9. The friction self-locking device with one-way adjustable damping according to claim 4, characterized in that: the unidirectional component (4) is a unidirectional bearing, and the elastic element (105) is a disc spring.