Long-stroke electromagnetic locking mechanism for motor

Abstract

The utility model provides a long-stroke electromagnetic locking mechanism for a motor. The long-stroke electromagnetic locking mechanism comprises a stator assembly and a motor rotating shaft, the stator assembly is sleeved outside the motor rotating shaft; the end face of the stator assembly is connected with a first moving block through a screw, and the screw is sleeved with a spring. The first movable block is provided with a boss and a guide pillar mounting hole, a guide pillar is arranged between the first movable block and the screw, and a cover plate is arranged between the guide pillar and the screw; a second moving block is connected to a rotating shaft of the motor, the second moving block is located on one side of the stator assembly, and a supporting lug is arranged on the second moving block. According to the utility model, the size of the mechanism is reduced, and reliable locking torque can be provided for a servo mechanism in a special working occasion; the system can be applied to severe vibration and humid and hot environments, and the working reliability of the system is effectively improved; the meshing height of the locking mechanism is effectively increased, meanwhile, the problems that in the locking process, a leather cup sucks and breaks down under the damp and hot condition of surface contact, the meshing height is reduced, locking is not reliable in the severe mechanical environment and the like are solved, and the working reliability of the motor in the special environment can be improved.

Description

Technical Field

[0001] The utility model relates to a long-stroke electromagnetic locking mechanism for a motor. Background Art

[0002] In special application scenarios, there are often high impact, large overload, and long-term vibration environments. Traditional locking mechanisms often rely on mechanical friction to provide locking torque, but in harsh mechanical environment conditions, the positive pressure on the friction pair pulsates, causing the locking force to pulsate, and it is impossible to provide a stable and reliable locking torque for the system; the use of a locking pin type locking mechanism is often subject to the requirements of electromagnetic force and system reliability. The locking pin structure has a low engagement height. In large impact situations, the locking mechanism has a micro-tilt, which leads to locking failure. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a long-stroke electromagnetic locking mechanism for a motor. The long-stroke electromagnetic locking mechanism for a motor has a power-off locking function. Due to its long stroke, it can provide a reliable engagement height to ensure the locking reliability of the motor under high impact and high vibration conditions.

[0004] The utility model is realized through the following technical solutions.

[0005] The utility model provides a long-stroke electromagnetic locking mechanism for a motor, comprising a stator assembly and a motor shaft; the stator assembly is sleeved outside the motor shaft; the end surface of the stator assembly is connected to a first moving block through a screw, and a spring is sleeved on the screw; a boss and a guide column mounting hole are provided on the first moving block, a guide column is provided between the first moving block and the screw, and a cover plate is provided between the guide column and the screw; a second moving block is connected to the motor shaft, the second moving block is located on one side of the stator assembly, and a support ear is provided on the second moving block.

[0006] The guide post is installed in the guide post installation hole.

[0007] When locked, the lug engages with the boss.

[0008] The first moving block is L-shaped.

[0009] The air gap between the outer circle of the first moving block and the inner diameter of the stator assembly is smaller than the air gap between the inner circle of the first moving block and the motor shaft.

[0010] The guide post installation hole and the guide post are clearance-matched.

[0011] The beneficial effects of the utility model are: the volume of the mechanism is reduced, and reliable locking torque can be provided for the servo mechanism in special working occasions; it can be applied in harsh vibration, humid and hot environments, and the reliability of the system operation is effectively improved; the engagement height of the locking mechanism is effectively improved, and at the same time, the "leather cup" suction and failure of the surface contact under humid and hot conditions during locking and the unreliable locking caused by the reduced engagement height in harsh mechanical environments are solved, and the reliability of the motor operation in special environments can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 A schematic diagram of the structure of the first moving block;

[0014] Figure 3 yes Figure 2 A cross-sectional view from the middle side;

[0015] Figure 4 yes Figure 1 A schematic diagram of the structure of the second moving block;

[0016] Figure 5 yes Figure 4 A cross-sectional view from the middle side;

[0017] In the figure: 1-stator assembly, 2-first moving block, 3-second moving block, 4-spring, 5-guide column, 6-cover plate, 7-motor shaft, 8-axial running air gap. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0019] Example 1

[0020] like Figures 1 to 5 As shown, a long-stroke electromagnetic locking mechanism for a motor comprises a stator assembly 1 and a motor shaft 7; the stator assembly 1 is sleeved on the outside of the motor shaft 7; the end surface of the stator assembly 1 is connected to a first movable block 2 through a screw, and a spring 4 is sleeved on the screw; a boss and a guide column mounting hole are provided on the first movable block 2, a guide column 5 is provided between the first movable block 2 and the screw, and a cover plate 6 is provided between the guide column 5 and the screw; a second movable block 3 is connected to the motor shaft 7, the second movable block 3 is located on one side of the stator assembly 1, and a support ear is provided on the second movable block 3.

[0021] The guide post 5 is installed in the guide post installation hole.

[0022] When locked, the lug engages with the boss.

[0023] The first moving block 2 is L-shaped.

[0024] The air gap between the outer circle of the first movable block 2 and the inner diameter of the stator assembly 1 is smaller than the air gap between the inner circle of the first movable block 2 and the motor shaft 7 .

[0025] The guide post installation hole and the guide post 5 are clearance-fitted.

[0026] Furthermore, the first movable block 2 moves in the axial direction, and the boss of the first movable block 2 is a part of the locking structure pair.

[0027] Furthermore, when the locking mechanism is working, the second movable block 3 rotates with the motor shaft 7, and has a lug thereon. When the locking mechanism is locked, the lug engages with the boss to generate a locking force, and is a part of the locking mechanism pair.

[0028] Furthermore, the spring 4 provides positive pressure to ensure that the first movable block 2 fits closely with the second movable block 3 when locked.

[0029] Furthermore, the guide pillar 5 provides radial limitation for the first movable block 2 .

[0030] Furthermore, the cover plate 6 is used to adjust the meshing height between the first movable block 2 and the second movable block 3 .

[0031] Example 2

[0032] Based on the technical solution of Example 1, and:

[0033] Designing the first movable block 2 to be L-shaped can ensure that after the axial running air gap 8 between the first movable block 2 and the stator assembly 1 is increased, the magnetic force generated by the stator assembly 1 at the inner hole is fully utilized, and sufficient electromagnetic force is provided under limited external dimensions, while also providing a higher meshing distance. In this way, the running stroke of the first movable block 2 can be more than 1 times that of the traditional locking structure while ensuring that the volume of the locking structure remains unchanged, ensuring that the meshing height is increased by 1 times, and providing a reliable locking force for the system.

[0034] Example 3

[0035] Based on the technical solution of Example 1, and:

[0036] When locked, the first movable block 2 fits with the stator assembly 1. In the traditional structure, the first movable block 2 is completely fitted with the end surface of the stator assembly 1. When the locking structure is in an environment with high humidity, a "leather cup" effect is easily produced, resulting in the first movable block 2 being unable to be unlocked normally.

[0037] In the present application, a non-parallel structure is used at A and B. By reasonably designing the spacing between A and B and the distance at the axial running air gap 8, it is ensured that when the first moving block 2 is attracted, A and B are first fitted together, and there is an air gap at the axial running air gap 8. The non-parallel structure at A and B changes the contact surface from surface contact to line contact, thereby improving the separation reliability of the locking mechanism.

[0038] Example 4

[0039] Based on the technical solution of Example 1, and:

[0040] The air gap between the outer circle of the first movable block 2 and the inner diameter of the stator assembly 1 is designed to be much smaller than the air gap between the inner circle of the first movable block 2 and the motor shaft 7. At the same time, it is ensured that the locking structure still has a 2 / 3 matching stop when locked. A guide column mounting hole is opened on the outer circle to match with the guide column 5 with a small gap, thereby forming a double gap matching mode. The two gaps are accumulated through the tolerance. When the locking mechanism is locked, in a harsh mechanical environment, the tilting distance of the first movable block 2 is effectively controlled, thereby having little effect on the meshing height of the first movable block 2 and the second movable block 3, thereby improving the product's resistance to mechanical environments.

Claims

1. A long-stroke electromagnetic locking mechanism for a motor, comprising a stator assembly (1) and a motor shaft (7), characterized in that: The stator assembly (1) is sleeved on the outside of the motor shaft (7); the end surface of the stator assembly (1) is connected to a first movable block (2) through a screw, and a spring (4) is sleeved on the screw; the first movable block (2) is provided with a boss and a guide column mounting hole, a guide column (5) is provided between the first movable block (2) and the screw, and a cover plate (6) is provided between the guide column (5) and the screw; the motor shaft (7) is connected to a second movable block (3), the second movable block (3) is located on one side of the stator assembly (1), and a support ear is provided on the second movable block (3).

2. The long-stroke electromagnetic locking mechanism for a motor according to claim 1, characterized in that: The guide post (5) is installed in the guide post installation hole.

3. The long-stroke electromagnetic locking mechanism for a motor according to claim 1, characterized in that: When locked, the lug engages with the boss.

4. The long-stroke electromagnetic locking mechanism for a motor according to claim 1, characterized in that: The first moving block (2) is L-shaped.

5. The long-stroke electromagnetic locking mechanism for a motor according to claim 1, characterized in that: The air gap between the outer circle of the first movable block (2) and the inner diameter of the stator assembly (1) is smaller than the air gap between the inner circle of the first movable block (2) and the motor shaft (7).

6. The long-stroke electromagnetic locking mechanism for a motor according to claim 1, characterized in that: The guide post installation hole and the guide post (5) are clearance-matched.

Images