One-way self-locking structure and one-way self-locking motor

Abstract

The utility model discloses a one -way self -locking structure and one -way self -locking motor, one -way self -locking structure includes spiral torsional spring (1), and one end of torsional spring (1) forms the pin (2) to the outside extension, and the inside of torsional spring (1) is equipped with two symmetrical distribution's brake band (3), and both ends of brake band (3) are equipped with the radial outward limit protruding (4);The section of brake band (3) is arc, and the outer diameter of brake band (3) is matched with the inner diameter of torsional spring (1);The pin (2) is L shape. The utility model has the advantages of good quietness.

Description

Technical Field

[0001] This utility model belongs to the field of height-adjustable table motors. Background Technology

[0002] There is a height-adjustable standing desk on the market that can accommodate different people's different requirements for desktop height. The power for raising and lowering the desk is driven by a motor.

[0003] The structure of the motor that drives the height adjustment of the desk includes a motor housing with a front cover and a rear cover at both ends. A stator is fixed inside the motor housing, and a rotor is located inside the stator. A motor shaft is axially mounted on the rotor. One end of the motor shaft is rotatably and slidably connected to the rear cover, and the other end is rotatably and slidably connected to the front cover. A worm gear housing is located on the front cover, containing a worm connected to the motor shaft. A worm wheel is located on one side of the worm, and a drive shaft is axially mounted on the worm wheel. The drive shaft is rotatably connected to the worm gear housing, with one end extending out of the housing. When the motor is energized, the rotor rotates due to the magnetic force. The rotor drives the worm to rotate via the motor shaft, and the worm drives the drive shaft to rotate via the worm wheel. When the motor is fixed to the desk frame assembly, the drive shaft is screwed to the desktop assembly. When the motor operates, the desktop assembly rises and falls, achieving height adjustment of the desk.

[0004] To prevent the lifting table from descending in the event of a power outage, a self-locking mechanism is installed on the motor. Existing self-locking structures on motors, such as the sliding shaft self-locking motor in application number 202322402522.1, configure the motor shaft to move axially. A friction plate is placed at one end of the motor shaft. The load on the lifting table causes the motor shaft to move axially, contacting the friction plate. The friction plate increases the rotational resistance of the motor shaft, thus locking the motor. However, because the motor shaft can move axially, the noise level during operation increases, resulting in poor noise reduction. Utility Model Content

[0005] The purpose of this invention is to provide a unidirectional self-locking structure and a unidirectional self-locking motor. This invention has the advantage of good noise reduction.

[0006] The technical solution of this utility model is as follows: a one-way self-locking structure, including a helical torsion spring, one end of the torsion spring extending outward to form a pin, and two symmetrically distributed brake pads on the inner side of the torsion spring, with radially outward limiting protrusions at both ends of the brake pads.

[0007] In the aforementioned one-way self-locking structure, the cross-section of the brake pad is arc-shaped, and the outer diameter of the brake pad matches the inner diameter of the torsion spring.

[0008] In the aforementioned unidirectional self-locking structure, the pin is L-shaped.

[0009] A unidirectional self-locking motor includes a stator, a front cover on the front side of the stator, a rear cover on the rear side of the stator, a rotor on the inner side of the stator, a motor shaft axially mounted on the rotor, one end of the motor shaft being rotatably connected to the rear cover, and the other end of the motor shaft being rotatably connected to the front cover. The unidirectional self-locking motor also includes the aforementioned unidirectional self-locking structure, with pins connected to the front cover or the rear cover, and the motor shaft passing tightly between two brake pads.

[0010] Compared with existing technologies, the torsion spring of this invention is connected to the front and rear covers of the motor and passes through the motor shaft. By setting two brake pads inside the torsion spring, a tight fit is established between the torsion spring and the motor shaft. When the motor shaft rotates in one direction (the direction in which the lifting table lowers its height), the torsion spring is in a tightened state, causing the two brake pads to grip the motor shaft, achieving motor self-locking. In the other direction of motor shaft rotation, the torsion spring is released, greatly reducing the friction between the brake pads and the motor shaft, allowing the motor shaft to rotate smoothly, achieving unidirectional motor self-locking. This invention achieves unidirectional self-locking without relying on axial movement of the motor shaft; the axial position of the motor shaft can remain unchanged, resulting in lower noise and better quiet operation. Therefore, this invention has the advantage of better quiet operation. Attached Figure Description

[0011] Figure 1 This is an exploded diagram of a unidirectional self-locking motor.

[0012] Figure 2 This is a front view schematic diagram of a one-way self-locking structure.

[0013] Figure 3 This is a right-side view of a one-way self-locking structure.

[0014] The markings in the attached diagram are as follows: 1-torsion spring, 2-pin, 3-brake pad, 4-limiting protrusion, 5-motor sleeve, 6-front cover, 7-rear cover, 8-stator, 9-rotor, 10-motor shaft, 12-screw, 13-worm gear housing, 14-worm gear, 15-drive shaft. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] Example: A unidirectional self-locking motor, such as Figure 1 As shown, it includes a stator 8, a motor sleeve 1 can be provided on the outside of the stator, a front cover 6 is provided on the front side of the stator 8, a rear cover 7 is provided on the rear side of the stator 8, a rotor 9 is provided on the inside of the stator 8, and a motor shaft 10 is provided on the rotor 9 axially. One end of the motor shaft 10 is rotatably connected to the rear cover 7, and the other end of the motor shaft 10 is rotatably connected to the front cover 6. The front cover 6 and the rear cover 7 are connected by multiple screws 12.

[0017] The front cover is provided with a worm gear housing 13, and a worm gear connected to the motor shaft 10 is provided inside the worm gear housing 13. A worm wheel 14 is provided on one side of the worm gear, and a drive shaft 15 is provided axially upward on the worm wheel 14. The drive shaft 15 is rotatably connected to the worm gear housing 13, and one end of the drive shaft 15 extends out of the worm gear housing 13.

[0018] The above describes the existing structure of the motor on the existing lifting table. In this embodiment, a one-way self-locking structure is added to the existing structure of the motor. The one-way self-locking structure includes a helical torsion spring 1. One end of the torsion spring 1 extends outward to form an L-shaped pin 2. The pin 2 is connected to the rear cover 6 or the front cover 7. Two symmetrically distributed brake pads 3 are provided on the inner side of the torsion spring 1. The cross-section of the brake pads 3 is arc-shaped. The outer diameter of the brake pads 3 matches the inner diameter of the torsion spring 1. The motor shaft 10 passes between the two brake pads 3, and an interference fit is formed between the brake pads 3 and the torsion spring 1. A certain gap is formed between the end faces of the two brake pads 3. Both ends of the brake pads 3 are provided with radially outward limiting protrusions 4. The limiting protrusions 4 prevent the brake pads 3 from axially disengaging from the torsion spring 1.

[0019] The working principle of unidirectional self-locking: The motor shaft 10 has two rotation directions, which determine whether the lifting table is raised or lowered. Similarly, the rotation direction of the motor shaft 10 determines whether the torsion spring 1 is in a tightened or loosened state. When the torsion spring 1 is tightened, it applies pressure to the brake pad 3, increasing the friction between the brake pad 3 and the motor shaft 10, thus increasing the rotational resistance of the motor shaft 10 and achieving self-locking. When the torsion spring 1 is loosened, the pressure between the brake pad 3 and the motor shaft 10 decreases, the rotational resistance of the motor shaft 10 is small, and the motor does not self-lock. It is only necessary to ensure that when the lifting table is lowered, the rotation of the motor shaft 10 causes the torsion spring 1 to tighten. At this time, the motor can still maintain self-locking even when the power is off, preventing changes in the table height. The helix direction of the torsion spring 1 determines which direction the motor 10 rotates when the torsion spring tightens.

[0020] Comparative example: Based on Example 1, one end of two brake pads 3 is connected together, and the two brake pads form a C-shaped brake ring.

[0021] Compared to the embodiment, the brake ring in the comparative example has an opening, so when the torsion spring 1 is tightened, the brake ring can also grip the motor shaft 10, achieving self-locking to a certain extent. However, because the brake ring has elasticity, it offsets part of the torsion spring's tightening force, resulting in a reduction in self-locking force.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A one-way self-locking structure, characterized in that: It includes a helical torsion spring (1), one end of which extends outward to form a pin (2), and two symmetrically distributed brake pads (3) are provided on the inner side of the torsion spring (1), and both ends of the brake pads (3) are provided with radially outward limiting protrusions (4).

2. The unidirectional self-locking structure according to claim 1, characterized in that: The cross-section of the brake pad (3) is arc-shaped, and the outer diameter of the brake pad (3) matches the inner diameter of the torsion spring (1).

3. The unidirectional self-locking structure according to claim 1, characterized in that: The pin (2) is L-shaped.

4. A unidirectional self-locking motor, comprising a stator (8), a front cover (6) on the front side of the stator (8), a rear cover (7) on the rear side of the stator (8), a rotor (9) on the inner side of the stator (8), a motor shaft (10) axially mounted on the rotor (9), one end of the motor shaft (10) being rotatably connected to the rear cover (7), and the other end of the motor shaft (10) being rotatably connected to the front cover (6), characterized in that: The unidirectional self-locking motor also includes the unidirectional self-locking structure as described in claim 1, 2 or 3, with pin (2) connected to the front cover (6) or the rear cover (7), and the motor shaft (10) passing tightly between the two brake pads (3).

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