Magnetic shaft switch capable of eliminating shaft core swing
By setting a single-point contact abutment between the core component and the guide component of the magnetic shaft switch, and using balls or convex points to adjust the force direction, the stability and accuracy problems caused by the core swaying are solved, resulting in more stable movement and a longer service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-03-27
AI Technical Summary
When subjected to non-perpendicular forces, the shaft of a magnetic shaft switch is prone to tilting, which leads to increased friction and increased clearance, affecting stroke accuracy and causing false triggering. Existing technologies are unable to effectively eliminate the shaft swaying phenomenon.
The design employs a single-point contact joint between the shaft core and the guide component, utilizing balls or protrusions to adjust the direction of force, ensuring stable movement of the guide component along the axis and reducing frictional losses.
It improves the stability and stroke accuracy of the shaft movement, reduces frictional loss, extends the service life of the magnetic shaft switch, and reduces the risk of false triggering.
Smart Images
Figure CN224053060U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to magnetic shaft switch technical field, concretely relates to a magnetic shaft switch capable of eliminating shaft core swing. BACKGROUND
[0002] At present, magnetic shaft switch is mainly applied to the field of magnetic shaft keyboard, and its working principle mainly depends on the up-down movement of the magnet driven by the integrally-formed shaft core, thereby realizing the on-off control of the circuit through the magnetic field change of the magnet. Specifically, the upper part of the shaft core is usually fixed with a key cap, and the lower part is assembled with a magnet for generating magnetic field change. In addition, a magnetic sensor (Hall sensor) is arranged below the magnetic component to accurately detect the magnetic field change.
[0003] Under ideal conditions, the shaft core is constrained by the shell and can drive the magnet to move linearly up and down, and the magnetic sensor accurately measures the up-down movement distance of the magnet through the magnetic field change. However, in actual application, the force direction of the user pressing the key cap is often difficult to be completely perpendicular to the key cap, and even many times it will be pressed on the edge part of the key cap, which causes the shaft core to be affected by the force direction and easily deviate from the central axis.
[0004] When the shaft core is affected by the deviated force, the downward pressure of the shaft core will be immediately decomposed into vertical downward pressure and lateral force, which further causes the shaft core to tilt and generate lateral pressure on the shaft sleeve wall. In this way, on the one hand, in order to prevent the sliding friction force between the shaft core and the shaft sleeve from increasing, a larger gap must be reserved between the shaft core and the shaft sleeve to minimize the contact area, thereby avoiding the phenomenon of unsmooth sliding or jamming; on the other hand, due to the existence of lateral pressure and the cooperation gap between the shaft core and the shaft sleeve, the inclination angle of the shaft core in the shaft sleeve will be further increased. This inclination angle will cause the shaft core stroke detected by the magnetic sensor to be unstable, ultimately affecting the stroke accuracy of the magnetic shaft and causing false triggering problems. Therefore, the utility model provides a magnetic shaft switch capable of eliminating shaft core swing. SUMMARY
[0005] The utility model provides a magnetic shaft switch capable of eliminating shaft core swing to solve the problems mentioned in the above background technology.
[0006] The purpose of the utility model is realized by the following way:
[0007] A magnetic shaft switch capable of eliminating shaft core swing, comprising a shell and a shaft core structure liftable arranged in the shell, a shaft sleeve is arranged in the shell, the shaft core structure comprises a magnet, a guide piece for sliding cooperation with the shaft sleeve, and a shaft core piece for connecting a key cap, the magnet is installed in the guide piece, a spring for abutting against the guide piece is arranged in the shell, and the shaft core piece and the guide piece are single-point contacted through the abutting part.
[0008] Further, the abutting portion is arranged on the guide and the central axis of the guide.
[0009] Further, a guide rail is arranged in the shell, and the shaft core member is in sliding cooperation with the guide rail through a sliding block.
[0010] Further, an excavated groove is arranged between the sliding block and the guide rail.
[0011] Further, the abutting portion comprises a containing groove and a ball arranged in the containing groove, and the ball protrudes from the containing groove.
[0012] Further, the inner diameter of the containing groove is greater than the diameter of the ball, so that the ball can move or roll in the containing groove.
[0013] Further, the inner edge of the bottom of the containing groove is provided with an inwardly-contracted round corner or chamfer.
[0014] Further, the abutting portion is a protruding circular protrusion or a conical protrusion.
[0015] The shaft core structure is composed of a guide and a shaft core member for connecting a key cap, and single-point contact is achieved between the shaft core member and the guide through an abutting portion, so that the shaft core member can be more easily adjusted in direction when subjected to a force in a non-vertical direction, and the guide can be ensured to move up and down along the central axis of the shaft sleeve. This design not only improves the stability of the shaft core movement, but also significantly reduces the friction loss between the shaft core and the shaft sleeve, prolonging the service life of the magnetic shaft switch. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a structural schematic view of a magnetic shaft switch capable of eliminating shaft core swing in Example 1.
[0017] Figure 2 It is an exploded schematic view of a magnetic shaft switch capable of eliminating shaft core swing in Example 1.
[0018] Figure 3 It is a sectional view of a magnetic shaft switch capable of eliminating shaft core swing in Example 1.
[0019] Figure 4 It is a force application schematic view of a magnetic shaft switch capable of eliminating shaft core swing in Example 1.
[0020] Figure 5 It is a structural schematic view of a base and a shaft core member in Example 1.
[0021] Figure 6 It is a local schematic view of a conical protrusion in Example 2.
[0022] Figure 7 This is a partial schematic diagram of the circular protrusion in Embodiment 2;
[0023] The reference numerals in the figure are as follows: 1-outer shell, 1A-top cover, 1B-base, 11B-shoulder sleeve, 12B-guide rail, 2-magnet, 3-shaft core structure, 3A-shaft core component, 31A-slider, 3B-guide component, 4-hollowed-out groove, 5-accommodating groove, 6-ball bearing, 7-conical protrusion, 8-circular protrusion, 9-spring. Detailed Implementation
[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0025] Example 1:
[0026] In this embodiment, refer to Figure 1 - Figure 2 The specific implementation of a magnetic shaft switch that can eliminate shaft wobble includes a housing 1 and a shaft structure 3 that is vertically and vertically disposed within the housing 1. A bushing 11B is disposed within the housing 1. The shaft structure 3 includes a magnet 2, a guide 3B for slidingly engaging with the bushing 11B, and a shaft component 3A for connecting a keycap. The shaft component 3A and the guide 3B make single-point contact through an abutment portion.
[0027] like Figure 3 As shown, the abutting part includes a receiving groove 5 and a ball 6 disposed within the receiving groove 5. The ball 6 protrudes from the receiving groove 5, allowing the shaft core 3A and the guide member 3B to make single-point contact through the ball 6, thereby achieving precise positioning, reducing wear, and extending service life. The bottom of the shaft core 3A abuts against the top of the ball 6 through a flat surface, forming a tangent state between the ball 6 and the bottom plane of the shaft core 3A.
[0028] The inner diameter of the receiving groove 5 is larger than the diameter of the ball 6, so that the ball 6 can move or roll within the receiving groove 5. When the shaft core 3A is subjected to external force, the ball 6 can roll freely within the receiving groove 5 to expand the adjustment range, effectively eliminate the shaft core swaying phenomenon, and further improve the stability and durability of the switch.
[0029] Furthermore, the bottom inner edge of the receiving groove 5 is provided with an inwardly tapered rounded corner or chamfer, which allows the ball 6 to quickly return to its original position, improves the smoothness of the movement of the ball 6 in the receiving groove 5, and at the same time increases the restriction on the ball 6 to prevent the ball 6 from rolling randomly.
[0030] The accommodating groove 5 is arranged at the upper end of the central axis of the guide piece 3B in this embodiment. Alternatively, the accommodating groove 5 can also be arranged at the lower end of the central axis of the shaft core piece 3A. However, since the inner diameter of the accommodating groove 5 is larger than the diameter of the ball 6, the ball 6 may fall off during the production and assembly process, which may affect the production efficiency. Therefore, the accommodating groove 5 is preferably arranged at the upper end of the central axis of the guide piece 3B.
[0031] As shown in Figure 4 When the user randomly presses different positions of the keycap, the shaft core piece 3A moves downward. Since the force point of the keycap may not be at the center of the shaft core piece 3A, a transverse component force is generated, which causes the shaft core piece 3A to tilt and sway away from the center. Thanks to the presence of the ball 6, the plane at the bottom of the shaft core piece 3A can only be in tangential contact with the ball 6, and the tangent point is located at the top of the ball 6. The pressure on the ball 6 is directed to the center of the ball (other directions will cause the ball 6 to roll, and finally the force direction will be directed to the center of the ball), so it can be determined that the force direction of the ball 6 is from the top to the center of the ball. After the ball 6 automatically adjusts the force direction, the force on the guide piece 3B is converted into a single direction along the shaft center. Since the pressure on the guide piece 3B is limited to the shaft center direction, it can stably and reliably move along the shaft center line, avoiding tilting and deviation. In addition, since the guide piece 3B does not bear radial pressure, the friction between the guide piece 3B and the shaft sleeve 11B is greatly reduced, and the fitting clearance can also be correspondingly reduced, thereby achieving more precise fitting. The distance of the magnet 2 in the guide piece 3B moving downward is no longer affected by the tilting of the shaft core piece 3A driven by the keycap, and remains stable. Since the magnetic field strength around the magnet 2 changes with distance, the magnetic sensor identifies the moving distance of the magnet 2 by sensing the change of the magnetic field strength. Therefore, when the tilting of the magnet 2 is effectively eliminated, the distance change between the magnet 2 and the magnetic sensor is more stable, and the magnetic sensor can more accurately convert the stroke of the magnet 2 probe into an electrical signal, significantly improving the stroke accuracy and greatly reducing the risk of false triggering. The utility model discloses a structure design of arranging the abutting portion between the shaft core piece 3A and the guide piece 3B, which can effectively limit the tilting amplitude of the guide piece 3B when it is subjected to non-vertical pressure, and further ensure that the guide piece 3B can keep relatively stable linear movement up and down.
[0032] The magnet 2 is embeddedly installed in the guide piece 3B, the abutting portion is arranged at the central axis of the guide piece 3B and the guide piece 3B, and the upper and lower parts of the spring 9 abut on the guide piece 3B and the shaft sleeve 11B respectively. The central axes of the guide piece 3B, the spring 9, the magnet 2 and the shaft sleeve 11B are coincided.
[0033] As shown in Figure 5As shown, the outer casing 1 is composed of a top cover 1A and a base 1B, which are connected by snap-fit fasteners. Two guide rails 12B are symmetrically arranged inside the base 1B. The shaft core 3A slides with the guide rails 12B via sliders 31A on both sides. A hollowed-out groove 4 is provided between the slider 31A and the guide rail 12B to reduce the contact area. This hollowed-out design effectively reduces friction, improves shaft core stability, and ensures smooth switch operation.
[0034] The shaft core structure 3 of this utility model is composed of a guide member 3B and a shaft core member 3A for connecting the keycap. The shaft core member 3A and the guide member 3B make single-point contact through an abutment portion, which allows the shaft core member 3A to more easily adjust the direction of the force when subjected to a non-perpendicular force through the abutment portion, ensuring that the guide member 3B can move up and down along the central axis of the bushing 11B. This design not only improves the stability of the shaft core movement but also significantly reduces the frictional loss between the shaft core and the bushing 11B, extending the service life of the magnetic shaft switch.
[0035] Example 2:
[0036] like Figures 6-7 As shown, the difference between this embodiment and Embodiment 1 lies in that the abutment portion is a protruding circular protrusion 8 or a conical protrusion 7. Using the circular protrusion 8 or conical protrusion 7 to connect the shaft core 3A and the guide 3B also achieves single-point contact between them. However, compared to the rollable ball bearing 6 structure of Embodiment 1, the adjustment range of the circular protrusion 8 or conical protrusion 7 is limited. When the shaft core 3A is subjected to a force in a non-perpendicular direction, its adjustment capability is relatively weak. Although the design of the circular protrusion 8 or conical protrusion 7 is simple, during long-term use, wear or deformation may lead to a decrease in the accuracy of single-point contact, thereby affecting the stability of the shaft core movement. However, this design still has certain application value in some application scenarios, such as situations where the requirements for feel are not strict or where there are certain cost constraints. The processing cost of the circular protrusion 8 or conical protrusion 7 is relatively low, and the installation is simple, which can meet basic usage requirements.
[0037] Furthermore, in this embodiment, the abutment portion can be integrally formed on the shaft core 3A or the guide 3B. Compared to the ball bearing 6 structure in Embodiment 1, although it only provides limited force direction adjustment, this structure is simpler, lower in cost, and easier to process and assemble. The design of the circular protrusion 8 or the conical protrusion 7 also ensures that when the shaft core 3A is subjected to force, the force direction is adjusted through single-point contact, preventing the shaft core 3A from swaying and maintaining the stable movement of the guide 3B along the axis. This design ensures stability while also taking cost-effectiveness into account, providing more options for different application scenarios.
[0038] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above in the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the technical solution of the present application, and any equivalent embodiment with equivalent changes is equivalent to the above embodiment. Any simple modification, equivalent change and modification of the above embodiment according to the present application technical solution are within the scope of the present application technical solution.
Claims
1. A magnetic shaft switch capable of eliminating shaft core swing, comprising a shell (1) and a shaft core structure (3) which is arranged in the shell (1) in a lifting manner, characterized in that: The shell (1) is provided with a shaft sleeve (11B), the shaft core structure (3) comprises a magnet (2), a guide (3B) for sliding fit with the shaft sleeve (11B), and a shaft core piece (3A) for connecting the key cap, the magnet (2) is installed in the guide (3B), the shell (1) is provided with a spring (9) for abutting the guide (3B), and the shaft core piece (3A) and the guide (3B) are single-point contacted through an abutting portion.
2. The magnetic shaft switch capable of eliminating shaft core swing according to claim 1, characterized in that: The abutting portion is arranged on the central axis of the guide (3B) and the guide (3B).
3. The magnetic shaft switch capable of eliminating shaft core swing according to claim 1, characterized in that: The shell (1) is provided with a guide rail (12B), and the shaft core piece (3A) is slidingly fitted with the guide rail (12B) through a sliding block (31A).
4. The magnetic shaft switch capable of eliminating shaft core swing according to claim 3, characterized in that: An excavated groove (4) is arranged between the sliding block (31A) and the guide rail (12B).
5. The magnetic shaft switch capable of eliminating shaft core swing according to any one of claims 1-4, characterized in that: The abutting portion comprises a containing groove (5) and a ball (6) arranged in the containing groove (5), and the ball (6) protrudes from the containing groove (5).
6. The magnetic shaft switch capable of eliminating shaft core swing according to claim 5, characterized in that: The inner diameter of the containing groove (5) is greater than the diameter of the ball (6), so that the ball (6) can move or roll in the containing groove (5).
7. The magnetic shaft switch according to claim 6, wherein: The inner edge of the bottom of the containing groove (5) is provided with an inwardly tapered round corner or chamfer.
8. The magnetic shaft switch capable of eliminating shaft core swing according to any one of claims 1-4, characterized in that: The abutting portion is a protruding circular convex point (8) or a tapered convex point (7).