Friction self-locking mechanism, electric driving mechanism and lifting table leg

Abstract

The application relates to the field of smart homes, in particular to a friction self-locking mechanism, an electric driving mechanism and a lifting table leg. The lifting table leg comprises a screw rod, the screw rod is provided with a connecting piece at a driving end, a first friction plate, a second friction plate, an elastic piece and a limiting mechanism are sequentially arranged below the connecting piece, the second friction plate is sleeved on the screw rod and fixedly connected with the screw rod, the first friction plate is clamped between the connecting piece and the second friction plate, and the elastic piece abuts against the second friction plate through the limiting mechanism. The lifting table leg has the advantages of low cost, reliable overall structure and convenient installation. The friction force is constant and does not change with the load. When self-locked, there is no time difference and no time delay.

Description

Technical Field

[0001] This invention relates to the field of smart homes, specifically to a friction self-locking mechanism, an electric drive mechanism, and a height-adjustable table leg. Background Technology

[0002] With advancements in technology and people's pursuit of a healthy lifestyle, electric height-adjustable desks are gaining increasing market favor. A height-adjustable desk consists of adjustable legs, a frame, and base plates. The adjustable legs are raised and lowered by a drive motor that rotates a lead screw in the drive tube. When the motor stops, the adjustable legs may slide down due to the load, affecting user safety and normal use. This necessitates a certain level of self-locking force in the adjustable legs.

[0003] Existing solutions for achieving self-locking force in height-adjustable table legs include: CN210461534U, which uses a one-way bearing at the end of the lead screw, allowing the lead screw to rotate smoothly only in the positive direction of the one-way bearing and preventing it from rotating in the opposite direction. This solution is costly and complex to install. CN213550352U uses an elastic torsion spring to apply clamping force to increase the self-locking force. This solution has a complex structure, the elastic torsion spring is unstable and needs to be replaced after a period of use, and there is a time difference in the rotation and clamping of the torsion spring, resulting in a delay in self-locking. CN210265590U discloses a friction self-locking mechanism. This mechanism uses friction components, and the self-locking force increases with the increase of load, but at the same time, the current increases, resulting in high losses and high requirements for the drive motor and control system. The self-locking mechanism, disclosed in CN212389191U, achieves self-locking force by clamping the moving friction plate with the first and second static friction plates under the compression force of the top wave spring. However, this self-locking mechanism is located on the spline connector, and the self-locking force is transmitted to the lead screw through the spline connector. Since there is a gap between the spline connector and the lead screw, vibration is easily generated. This vibration occurs on the electric lifting table, which will cause the lifting table to operate unstablely and result in a poor user experience. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To address this, the present invention proposes a friction self-locking mechanism, an electric drive mechanism, and a lifting table leg. The friction self-locking structure is located between the drive end and the threaded end of the lead screw. The friction self-locking structure is limited by a connector located at the drive end and a limiting structure located between the connecting section and the threaded section. It can operate efficiently and has outstanding self-locking performance. At the same time, there is no time difference during self-locking and there is no delay.

[0006] The technical solution to achieve the purpose of this invention is: a friction self-locking mechanism, including a lead screw, the lead screw having a driving end, a connecting member being provided on the driving end, a first friction plate, a second friction plate, an elastic member and a limiting mechanism being provided in sequence below the connecting member, the second friction plate being fitted on the lead screw and fixedly connected to the lead screw, the first friction plate being clamped between the connecting member and the second friction plate, and the elastic member abutting against the second friction plate through the limiting mechanism.

[0007] Furthermore, the lead screw includes a drive end, a connecting section, and a threaded section. A limiting groove is provided between the connecting section and the threaded section. The limiting mechanism is a limiting retaining ring, and the limiting mechanism is disposed in the limiting groove.

[0008] Furthermore, the lead screw includes a drive end, a connecting section, and a threaded section, and the limiting mechanism is a limiting step, which is disposed between the connecting section and the threaded section.

[0009] Furthermore, the connecting segment is a non-circular structure, and the second friction plate has an inner hole adapted to the shape of the connecting segment.

[0010] Furthermore, after the lead screw is tightened by the screw, the elastic element generates a constant preload.

[0011] Furthermore, the elastic element is a disc spring, a wave spring, or a spring sheet.

[0012] Furthermore, the disc spring consists of two discs stacked on top of each other.

[0013] An electric drive mechanism includes the friction self-locking structure described in any one of the above, and further includes a motor, a transmission device, and a housing; the motor drives the transmission device to rotate, a connecting member cooperates with the transmission device to realize the power output between the transmission device and the lead screw, and a first friction plate is fixedly connected to the housing.

[0014] Furthermore, the housing is provided with a plurality of pillars, and the first friction plate is provided with a plurality of slots that cooperate with the pillars.

[0015] Furthermore, it also includes a bearing sleeve, through which the first friction plate is fixedly connected to the housing, and a bearing is provided inside the bearing sleeve.

[0016] An electric drive mechanism includes the friction self-locking structure described in any one of the above, and further includes a motor, a transmission device, and a gearbox; the transmission device is disposed in the gearbox, the transmission device includes a driving member and a driven member that cooperate with each other, the motor transmits power to the driving member through a transmission rod, the driven member is disposed at the driving end of the lead screw, the connecting member is a bearing sleeve, a bearing is provided between the driven member and the bearing sleeve, and a first friction plate is fixed to the bottom of the gearbox.

[0017] Furthermore, the gearbox includes a left housing and a right housing that are connected and fixed together.

[0018] Furthermore, a boss is provided on the side of the first friction plate that abuts against the connecting member.

[0019] Furthermore, the gearbox is provided with a plurality of pillars two, and the first friction plate is provided with a plurality of slots that cooperate with the pillars two.

[0020] A height-adjustable table leg includes the friction self-locking mechanism described in any one of the above claims, or includes the electric drive mechanism described in any one of the above claims.

[0021] After adopting the above technical solution, the present invention has the following positive effects:

[0022] (1) The present invention has low cost, reliable overall structure and convenient installation.

[0023] (2) The self-locking friction force of this invention is determined by the preload and the coefficient of friction, and is a constant value that does not change with the load and has no time delay. Since there is no time difference in the self-locking force between the table legs, the operation is smooth and there is no shaking. Attached Figure Description

[0024] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0025] Figure 1 This is an exploded view of Example 1;

[0026] Figure 2 for Figure 1 Enlarged view of point I;

[0027] Figure 3 This is a schematic diagram of the first friction plate structure;

[0028] Figure 4 This is a schematic diagram of the second friction plate structure;

[0029] Figure 5 This is an exploded view of Example 2;

[0030] Figure 6 for Figure 5 Enlarged view of section II;

[0031] Figure 7 This is a cross-sectional view of Example 3;

[0032] Figure 8 This is a cross-sectional view of Example 4;

[0033] Figure 9 This is an exploded view of Example 5;

[0034] Figure 10 This is a cross-sectional view of Example 5;

[0035] Figure 11 for Figure 7 A magnified view of a portion of the image;

[0036] Figure 12 This is a schematic diagram of column two;

[0037] Figure 13 This is a schematic diagram of the structure of Example 6.

[0038] The attached figures are labeled as follows: 1. Lead screw; 1-1. Drive end; 1-2. Connecting section; 1-3. Limiting groove; 2. Connecting piece; 3. First friction plate; 3-1. Boss; 3-2. Slot; 4. Second friction plate; 4-1. Inner hole; 5. Elastic element; 6. Limiting mechanism; 7. Motor; 8. Transmission device; 8-1. Driving element; 8-2. Driven element; 9. Housing; 9-1. Column one; 10. Gearbox; 10-1. Left housing; 10-2. Right housing; 10-3. Column two; 11. Transmission rod; 12. Bearing sleeve; 13. Bearing. Detailed Implementation

[0039] Example 1

[0040] See Figures 1 to 4 This embodiment is a friction self-locking mechanism, including a lead screw 1, the lead screw 1 having a drive end 1-1, a connector 2 provided on the drive end 1-1, and a first friction plate 3, a second friction plate 4, an elastic element 5 and a limiting mechanism 6 arranged sequentially below the connector 2. The second friction plate 4 is fitted on the lead screw 1 and fixedly connected to the lead screw 1. The first friction plate 3 is clamped between the connector 2 and the second friction plate 4. The elastic element 5 abuts against the second friction plate 4 through the limiting mechanism 6.

[0041] The lead screw 1 includes a drive end 1-1, a connecting section 1-2 and a threaded section. A limiting groove 1-3 is provided between the connecting section 1-2 and the threaded section. The limiting mechanism 6 is a limiting retaining ring and is located in the limiting groove 1-3.

[0042] The connecting section 1-2 is a non-circular structure, and the second friction plate 4 has an inner hole 4-1 that matches the shape of the connecting section 1-2. After the lead screw 1 is tightened by the screw, the elastic element 5 generates a constant preload. The elastic element 5 is any one of a disc spring, a wave spring, or a spring sheet. The disc spring consists of two discs stacked opposite each other.

[0043] Example 2

[0044] See Figures 5 to 6This embodiment is basically the same as embodiment 1, except that the lead screw 1 includes a drive end 1-1, a connecting section 1-2 and a threaded section. A limiting groove 1-3 is provided between the connecting section 1-2 and the threaded section. The limiting mechanism 6 is a limiting step and is located between the connecting section 1-2 and the threaded section.

[0045] Example 3

[0046] See Figure 7 This embodiment is an electric drive mechanism that includes the friction self-locking structure of Embodiment 1, and also includes a motor 7, a transmission device 8, and a housing 9. The motor 7 drives the transmission device 8 to rotate, and the connecting piece 2 cooperates with the transmission device 8 to realize the power output between the transmission device 8 and the lead screw 1. The first friction plate 3 is fixedly connected to the housing 9. The housing 9 is provided with a plurality of columns 9-1, and the first friction plate 3 is provided with a plurality of slots 3-2 that cooperate with the columns 9-1.

[0047] Example 4

[0048] See Figure 8 The difference between this embodiment and implementation 3 is that it also includes a bearing sleeve 12. The first friction plate 3 is fixedly connected to the housing 9 through the bearing sleeve 12, and a bearing 13 is provided inside the bearing sleeve 12.

[0049] Example 5

[0050] See Figures 9 to 12 This embodiment is an electric drive mechanism including the friction self-locking structure of Embodiment 1, and also includes a motor 7, a transmission device 8, and a gearbox 10. The transmission device 8 is disposed inside the gearbox 10 and includes a driving member 8-1 and a driven member 8-2 that cooperate with each other. The motor 7 transmits power to the driving member 8-1 through a transmission rod 11. The driven member 8-2 is disposed at the driving end 1-1 of the lead screw 1. The connecting member 2 is a bearing sleeve, and a bearing 13 is provided between the driven member 8-2 and the bearing sleeve. The first friction plate 3 is fixed to the bottom of the gearbox 10. The gearbox 10 includes a left housing 10-1 and a right housing 10-2 that are connected and fixed together. A boss 3-1 is provided on the side of the first friction plate 3 that abuts against the connecting member 2. A plurality of pillars 10-3 are provided on the gearbox 10, and a plurality of slots 3-2 that cooperate with the pillars 10-3 are provided on the first friction plate 3.

[0051] Example 6

[0052] See Figure 13 This embodiment is a height-adjustable table leg, including the friction self-locking mechanism of embodiment 1, or the electric drive mechanism of embodiment 2 or embodiment 3.

[0053] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A friction self-locking mechanism, characterized in that: The screw includes a lead screw (1), which has a drive end (1-1). A connector (2) is provided on the drive end (1-1). A first friction plate (3), a second friction plate (4), and an elastic element (5) are arranged in sequence below the connector (2). The second friction plate (4) is fitted on the lead screw (1) and fixedly connected to the lead screw (1). The first friction plate (3) is clamped between the connector (2) and the second friction plate (4). The elastic element (5) abuts against the second friction plate (4) through a limiting mechanism (6). The lead screw (1) includes a drive end (1-1), a connecting section (1-2), and a threaded section. The connecting section (1-2) is a non-circular structure. The second friction plate (4) has an inner hole (4-1) that matches the shape of the connecting section (1-2). After the lead screw (1) is locked by a screw, the elastic element (5) generates a constant preload.

2. The friction self-locking mechanism according to claim 1, characterized in that: A limiting groove (1-3) is provided between the connecting section (1-2) and the threaded section. The limiting mechanism (6) is a limiting retaining ring and is located in the limiting groove (1-3).

3. The friction self-locking mechanism according to claim 1, characterized in that: The limiting mechanism (6) is a limiting step, and the limiting mechanism (6) is disposed between the connecting section (1-2) and the threaded section.

4. The friction self-locking mechanism according to claim 1, characterized in that: The elastic element (5) is a disc spring, a wave spring, or a spring sheet.

5. The friction self-locking mechanism according to claim 4, characterized in that: The disc spring consists of two discs stacked on top of each other.

6. An electric drive mechanism, characterized in that: The friction self-locking mechanism according to any one of claims 1-5 further includes a motor (7), a transmission device (8), and a housing (9); the motor (7) drives the transmission device (8) to rotate, the connecting piece (2) cooperates with the transmission device (8) to realize the power output between the transmission device (8) and the lead screw (1), and the first friction plate (3) is fixedly connected to the housing (9).

7. The electric drive mechanism according to claim 6, characterized in that: The housing (9) is provided with a plurality of pillars (9-1), and the first friction plate (3) is provided with a plurality of slots (3-2) that cooperate with the pillars (9-1).

8. The electric drive mechanism according to claim 6, characterized in that: It also includes a bearing sleeve (12), the first friction plate (3) is fixedly connected to the housing (9) through the bearing sleeve (12), and a bearing (13) is provided inside the bearing sleeve (12).

9. An electric drive mechanism, characterized in that: The friction self-locking mechanism according to any one of claims 1-5 further includes a motor (7), a transmission device (8), and a gearbox (10); the transmission device (8) is disposed in the gearbox (10), the transmission device (8) includes a driving member (8-1) and a driven member (8-2) that cooperate with each other, the motor (7) transmits power to the driving member (8-1) through a transmission rod (11), the driven member (8-2) is disposed at the driving end (1-1) of the lead screw (1), the connecting member (2) is a bearing sleeve, a bearing (13) is provided between the driven member (8-2) and the bearing sleeve, and the first friction plate (3) is fixed at the bottom of the gearbox (10).

10. The electric drive mechanism according to claim 9, characterized in that: The gearbox (10) includes a left housing (10-1) and a right housing (10-2) that are connected and fixed together.

11. The electric drive mechanism according to claim 9, characterized in that: The first friction plate (3) has a boss (3-1) on the side that abuts against the connector (2).

12. The electric drive mechanism according to claim 9, characterized in that: The gearbox (10) is provided with a plurality of two pillars (10-3), and the first friction plate (3) is provided with a plurality of slots (3-2) that cooperate with the two pillars (10-3).

13. A height-adjustable table leg, characterized in that: It includes the friction self-locking mechanism according to any one of claims 1-5, or the electric drive mechanism according to any one of claims 6-12.

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