Electromagnetic actuator

Abstract

The application provides an electromagnetic actuator, which comprises a ring-shaped electromagnetic assembly, a push ring is coaxially sleeved in the inner ring of the electromagnetic assembly, the push ring moves along the axial direction under the drive of the electromagnetic assembly, the outer wall of the push ring is attached to the inner wall of the inner ring, and the radial position of the push ring is determined by the inner wall of the inner ring when the push ring moves along the axial direction. The electromagnetic actuator provided by the application can keep the stability of the axial movement of the push ring by using the attachment and guidance of the inner wall of the push ring and the inner ring of the electromagnetic assembly. The radial position stability of the push ring can be kept without adding a coaxial sleeve part attached to the push ring and without relying on an external coaxial part, so that the electromagnetic actuator provided by the application is more integrated and smaller in structure.

Description

Technical Field

[0001] This invention relates to the field of power transmission and coupling device technology, specifically to an electromagnetic actuator. Background Technology

[0002] Electromagnetic actuators are key components used to transmit or couple power. They typically consist of an electromagnetic assembly and a push ring. When the electromagnetic assembly is energized, it generates an electromagnetic field based on the principle of electromagnetic induction. Driven by this magnetic field, the push ring is attracted, causing it to move along its own axis. The thrust of the push ring drives an external power device or couples with a power device. Throughout its axial movement, the push ring must maintain a stable radial position without shifting.

[0003] A utility model patent publication with publication number "CN221443140U" entitled "A Snap-on Electromagnetic Torque Disconnection Device" discloses an electromagnetic actuator, including an electromagnetic clutch element, a push ring element, and a spring-driven power transmission mechanism. According to Figure 8 in the specification and related descriptions, the push ring element includes an outer ring and an inner ring. An end cap ring is fitted onto the input shaft, and the inner ring of the push ring is in contact with the inner wall of the end cap ring. When the push ring element is driven axially by magnetic force, the contact between the end cap ring and the inner wall of the push ring guides it, ensuring stability during axial movement and preventing radial displacement. Similarly, a utility model patent publication with publication number "CN221762482U" entitled "An Electromagnetic Clutch" also discloses a push ring outer ring that utilizes the contact between its inner wall and the input shaft for guidance, ensuring the stability of the push ring's axial movement.

[0004] Existing technologies that utilize the outer wall of the push ring and its coaxial components for guidance require additional shaft fittings for guidance and positioning (such as the end cap ring in existing technical documents), or the outer ring of the push ring needs to be in contact with an external input shaft to maintain the stability of the push ring's axial movement. On the one hand, this increases structural complexity and the number of parts; on the other hand, it requires the push ring to have a longer axial length to be in contact with the external coaxial components for stable guidance, which is not conducive to the integration, miniaturization, and consolidation of the actuator. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an electromagnetic actuator, comprising an annular electromagnetic assembly, wherein a push ring is coaxially sleeved within the inner ring of the electromagnetic assembly, and the push ring moves along its axial direction under the drive of the electromagnetic assembly. The outer sidewall of the push ring is in contact with the inner sidewall of the inner ring, and the radial position of the push ring is determined by the inner sidewall of the inner ring when the push ring moves along its axial direction.

[0006] Furthermore, a barrier member is installed between the outer wall of the push ring and the inner ring of the electromagnetic assembly. The barrier member is attached to the inner wall of the inner ring, and the push ring rubs against the barrier member when it moves along its axial direction.

[0007] Furthermore, the inner sidewall of the barrier member and / or the outer sidewall of the push ring have concave clearance areas.

[0008] Furthermore, the barrier component is a cylindrical component made of metal woven mesh.

[0009] Furthermore, the barrier component is a cylindrical sleeve, and the recessed clearance area is a groove and / or hole distributed on the inner surface of the cylindrical sleeve or the outer wall of the push ring.

[0010] Furthermore, a groove is formed on the inner surface of the cylindrical spacer, and the groove is parallel to and connected to the bottom surface of the cylindrical spacer.

[0011] Furthermore, the electromagnetic component includes an annular outer shell, a coil embedded inside the outer shell, a top cover for the pole shoe end cap, and a barrier member attached to the inner wall of the outer shell. The barrier member has an overlapping edge that is fastened to the upper surface of the inner wall of the outer shell.

[0012] Furthermore, the coil is covered by a coil frame, and the inner wall of the coil frame has a protruding ring, which presses against the overlapping edge of the blocking component.

[0013] Furthermore, the electromagnetic component includes an annular outer shell, a coil embedded inside the outer shell, and a top cover for the pole shoe end cap. The push ring includes an inner push ring and an outer push ring coaxially sleeved together. The outer side wall of the outer push ring is fitted with the inner wall of the outer shell, and the inner side wall of the outer push ring and the outer side wall of the inner push ring are fixedly connected.

[0014] Furthermore, the outer wall of the inner ring of the push ring fits into the inner circle of the pole shoe end cap, the top end face of the inner ring of the push ring has a flange that overlaps the outer end face of the inner circle of the pole shoe end cap, and the bottom end face of the inner ring of the push ring is located inside the bottom end face of the outer ring of the push ring.

[0015] Furthermore, the inner wall of the barrier member and / or the outer wall of the push ring are coated with a PTFE coating.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects: The electromagnetic actuator proposed in this invention utilizes the inner sidewall of the push ring and the inner ring of the electromagnetic component for guidance, which can maintain the stability of the axial movement of the push ring. It eliminates the need for additional coaxial components that fit with the push ring, and does not rely on external coaxial parts to maintain the radial position stability of the push ring, making the electromagnetic actuator structure provided by this invention more integrated and miniaturized. Attached Figure Description

[0017] Figure 1 : A schematic diagram of the electromagnetic actuator structure provided in Embodiment 1 of the present invention; Figure 2 : A schematic diagram of the split structure of the electromagnetic actuator provided in Embodiment 1 of the present invention; Figure 3 Cross-sectional view of the electromagnetic actuator provided in Embodiment 1 of the present invention; Figure 4 : Figure 3 Enlarged view of a specific area; Figure 5 : A schematic diagram of the barrier component structure provided in Embodiment 4 of the present invention; Figure 6 : A schematic diagram of the barrier component structure provided in Embodiment 3 of the present invention; Figure 7 : A schematic diagram of the barrier component structure provided in Embodiment 5 of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: As Figures 1-3 As shown.

[0020] The device includes an annular electromagnetic component 1, in which a push ring 2 is coaxially sleeved within the inner ring 11 of the electromagnetic component 1. The push ring 2 moves along its axial direction under the drive of the electromagnetic component 1. The outer side wall of the push ring 2 is in contact with the inner side wall of the inner ring 11 of the electromagnetic component. When the push ring 2 moves along its axial direction, the radial position of the push ring 2 is determined by the inner side wall of the inner ring 11 of the electromagnetic component.

[0021] In this embodiment, the electromagnetic component 1 is an integral ring-shaped structure. Specifically, the electromagnetic component 1 includes an annular outer shell 12, within which a coil 13 is embedded, and a pole shoe end cap 14 is fitted on top. The pole shoe end cap 14 has an inner circle, and the outer shell 12 has a vertical inner wall 121, together forming the inner ring 11 of the electromagnetic component 1. A push ring 2 is fitted within this inner ring 11, and the outer wall of the push ring 2 is in contact with the inner wall of the inner ring 11. When the electromagnetic component 1 is energized, its electromagnetic force attracts the push ring 2, causing it to move axially. Due to the guide and contact between the outer wall of the push ring 2 and the inner ring 11, the radial position of the push ring 2 remains stable. This electromagnetic actuator maintains the stability of axial movement of the push ring 2 without relying on external coaxial components, and it does not require the addition of a shaft assembly that is coaxially fitted with the inner wall of the push ring 2, making the electromagnetic actuator structure more miniaturized and integrated. It should be noted that the electromagnetic component 1 is not limited to an annular shape; it can also be other annular components with an inner ring 11.

[0022] In a more preferred embodiment, the push ring 2 is configured as a split structure. The push ring 2 includes an inner push ring 21 and an outer push ring 22 coaxially sleeved together. The outer side wall of the outer push ring 22 fits against the inner wall 121 of the outer shell, and the inner side wall of the outer push ring 22 is fixedly connected to the outer side wall of the inner push ring 21. In this case, the outer side wall of the outer push ring 22 serves as a guide surface, fitting and guiding against the inner wall 121 of the outer shell. Since the inner side wall of the outer push ring 22 and the outer side wall of the inner push ring 21 are fixedly connected, the inner push ring 21 is stably guided by the outer push ring 22 during axial movement. The split design of the push ring 2 facilitates assembly; the inner side wall of the outer push ring 22 and the inner push ring 21 can be coaxially sleeved from both ends of the outer shell 12 and assembled into an integrated component. The inner side wall of the outer push ring 22 and the outer side wall of the inner push ring 21 can be press-fitted, welded, or riveted, etc.

[0023] Based on the above implementation, since the push ring 2 is a split structure and the outer ring 22 of the push ring is the main guide component, the axial length of the inner ring 21 of the push ring can be designed to be shorter, and its bottom end face is located inside the bottom end face of the outer ring 22 of the push ring. The miniaturized inner ring 21 of the push ring makes the electromagnetic actuator structure lighter and smaller.

[0024] The outer ring 22 of the push ring and the inner wall 121 of the outer casing are fitted together for guidance, which can maintain the stability of the axial movement of the push ring 2. In order to further improve the stability, the inner side wall of the inner ring 21 of the push ring is fitted together with the inner circle of the pole shoe end cap 14. The upper and lower ends of the entire push ring 2 are both guided by the outer side walls of the push ring 2, which are respectively fitted together with the inner wall 121 of the outer casing and the inner circle of the pole shoe end cap 14, resulting in higher axial movement stability of the push ring 2.

[0025] In a more preferred embodiment, the top end face of the inner ring 21 of the push ring has a flange 211 that overlaps the outer end face of the inner circle of the pole shoe end cap 14. When the push ring 2 returns to its original position, it can be axially limited by the cooperation between the flange 211 and the inner circle of the pole shoe end cap 14.

[0026] Example 2: Figure 4 As shown, see also Figure 2 and Figure 3 Based on the above embodiment, the axial movement of the push ring 2 is guided by its outer side wall and the inner ring 11 of the electromagnetic component 1. When the push ring 2 rubs against the inner ring 11 of the electromagnetic component 1, magnetic debris will be generated and remain between the inner ring 11 of the electromagnetic component 1 and the outer side wall of the push ring 2. This debris residue will affect the stability of the axial movement of the push ring 2.

[0027] In this embodiment, the electromagnetic component 1 has a similar structure to that in Embodiment 1. A barrier member 3 is installed between the outer wall of the push ring 2 and the inner ring 11 of the electromagnetic component 1. The barrier member 3 is fitted against the inner wall of the inner ring 11, and the push ring 2 rubs against the barrier member 3 as it moves axially. The barrier member 3 acts as a friction element, rubbing against the push ring 2. Compared to the electromagnetic component 1, it has better wear resistance and can prevent debris generation. As a friction barrier, the barrier member 3 can have a smaller wall thickness than adding a shaft assembly for guidance, and will not occupy too much axial space of the electromagnetic actuator. In this embodiment, the barrier member 3 is a cylindrical component made of non-magnetic material located between the inner wall 121 of the housing and the outer ring 22 of the push ring.

[0028] In a more preferred embodiment, the barrier member 3 is attached to the inner wall 121 of the outer casing. The barrier member 3 has an overlapping edge 33, which is fastened to the upper surface of the inner wall 121 of the outer casing. The overlapping edge 33 and the upper surface of the inner wall 121 cooperate to prevent relative axial displacement between the barrier member 3 and the inner wall 121 when the outer ring 22 of the push ring rubs against it.

[0029] In a more preferred embodiment, the coil 13 is covered by a coil frame 131, and the inner wall of the coil frame 131 has a protruding ring 132, which presses against the overlapping edge 33 of the blocking member 3. After the protruding ring 132 of the coil frame 131 presses against the overlapping edge 33, the axial position of the blocking member 3 is determined, and it will not axially disengage due to friction from the outer ring 22 of the push ring.

[0030] Example 3: Figure 6 As shown in Example 2, although the generation of debris is improved by the barrier member 3, the friction between the push ring 2 and the barrier member 3 during prolonged operation may still generate some debris. Therefore, based on Example 2, the barrier member 3 is further improved.

[0031] The inner wall of the barrier member 3 has a recessed clearance area. The inner wall of the barrier member 3 serves as the surface that rubs against the outer ring 22 of the push ring. This friction surface should be a completely flat surface without any protrusions that would increase friction. However, if this surface has a recessed clearance area, debris generated by friction can enter the recessed clearance area during repeated contact and friction with the outer ring 22 of the push ring. These clearance areas are used to store this debris, preventing it from distributing between the inner wall of the barrier member 3 and the outer wall of the push ring 22, thus affecting the stability of the axial movement of the push ring 2. It should be noted that the recessed clearance area, since it does not have a protruding component, does not affect the flatness of the inner wall of the barrier member 3, and therefore does not increase the friction force when in contact with the outer ring 22 of the push ring.

[0032] In this embodiment, the barrier member 3 is a cylindrical sleeve 32, and the recessed clearance area is a groove 321 formed on the inner surface of the cylindrical sleeve 32. The grooves 321 can be arrayed along the entire inner surface of the cylindrical sleeve 32, and debris can be stored in these grooves 321. It should be noted that the recessed clearance area is not limited to grooves or pits formed on the inner wall of the barrier member 3, but can also be multiple barrier members 3 arranged at intervals, such as some spacers arranged between the inner wall 121 of the outer shell and the outer ring 22 of the push ring. The space between these spacers will be the recessed clearance area relative to the inner wall of the barrier member 3.

[0033] In a more preferred embodiment, the groove 321 and the push ring 2 are parallel to each other and connected to the lower bottom surface of the cylindrical spacer 32. The parallel movement directions of the groove 321 and the push ring 2 minimize friction on the outer ring 22 of the push ring. Since the groove 321 is connected to the lower bottom surface of the cylindrical spacer 32, stored debris is guided and discharged as the push ring 2 continuously moves axially, preventing debris accumulation.

[0034] Alternatively, the groove 321, which serves as an inner recessed clearance area, can also be formed on the outer surface of the outer ring 22 of the push ring by knurling. The extension direction of the groove 321 is not limited to being parallel to the axis of the push ring 2. It can be at a certain angle, or it can be distributed in a ring or spiral shape on the outer surface of the outer ring 22 of the push ring.

[0035] Example 4: Figure 5 As shown.

[0036] The difference between this embodiment and Embodiment 3 is that the barrier member 3 is a cylindrical member 31 made of metal braided mesh, located between the inner wall 121 of the outer shell and the outer ring 22 of the push ring. The metal braided mesh has an array of grooves or pits to store debris. The surface of the metal braided mesh or the outer surface of the outer ring 22 of the push ring can be coated with a PTFE lubricating coating to reduce friction. It should be noted that the PTFE coating as a lubricating coating is not limited to the metal braided mesh; the surface of the barrier member 3 or the outer wall of the push ring 2 in other structural schemes can also be coated with PTFE to reduce friction.

[0037] Example 5: Figure 7 As shown.

[0038] The difference between this embodiment and Embodiment 3 is that the barrier member 3 is a cylindrical spacer 32, and the inner surface of the cylindrical spacer 32 is distributed with an array of holes. In this embodiment, these holes are through holes 322, but the inner surface of the cylindrical spacer 32 is still a flat surface, which will not increase the friction. The array of these holes serves as a concave clearance area, which can store the debris generated by the friction between the outer ring 22 of the push ring and the inner surface of the cylindrical spacer 32.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic actuator comprising an annular electromagnetic assembly (1), wherein a push ring (2) is coaxially sleeved within the inner ring (11) of the electromagnetic assembly (1), the push ring (2) moving along its axial direction under the drive of the electromagnetic assembly (1), characterized in that, The outer wall of the push ring (2) and the inner wall of the inner ring (11) are in contact. When the push ring (2) moves along its axial direction, the radial position of the push ring (2) is determined by the inner wall of the inner ring (11).

2. The electromagnetic actuator as described in claim 1, characterized in that, A barrier member (3) is installed between the outer wall of the push ring (2) and the inner ring (11) of the electromagnetic assembly (1). The barrier member (3) is attached to the inner wall of the inner ring (11). The push ring (2) rubs against the barrier member (3) when it moves along its axial direction.

3. The electromagnetic actuator as described in claim 2, characterized in that, The inner wall of the barrier member (3) and / or the outer wall of the push ring (2) have concave clearance areas.

4. The electromagnetic actuator as described in claim 3, characterized in that, The barrier component (3) is a cylindrical component (31) made of metal woven mesh.

5. The electromagnetic actuator as described in claim 3, characterized in that, The barrier component (3) is a cylindrical sleeve (32), and the recessed clearance area is a groove and / or hole distributed on the inner surface of the cylindrical sleeve (32) or the outer wall of the push ring (2).

6. The electromagnetic actuator as described in claim 5, characterized in that, A groove (321) is provided on the inner surface of the cylindrical spacer (32) or the outer surface of the push ring (2). The groove (321) and the push ring (2) are parallel to each other and connected to the bottom surface of the cylindrical spacer (32).

7. The electromagnetic actuator as described in any one of claims 2 to 6, characterized in that, The electromagnetic component (1) includes an annular outer shell (12), a coil (13) is embedded in the outer shell (12), a top cover is closed with a pole shoe end cap (14), and a barrier member (3) is attached to the inner wall (121) of the outer shell. The barrier member (3) has an overlapping edge (33) which is fastened to the upper surface of the inner wall (121) of the outer shell.

8. The electromagnetic actuator as described in claim 7, characterized in that, The coil (13) is covered by a coil frame (131), and the inner wall of the coil frame (131) has a protruding ring (132), which presses against the overlapping edge (33) of the blocking member (3).

9. The electromagnetic actuator as described in claim 1, characterized in that, The electromagnetic component (1) includes an annular outer shell (12), a coil (13) is embedded in the outer shell (12), and a top cover and pole shoe end cover (14). The push ring (2) includes a push ring inner ring (21) and a push ring outer ring (22) coaxially sleeved, and the inner side wall of the push ring outer ring (22) and the outer side wall of the push ring inner ring (21) are fixedly connected.

10. The electromagnetic actuator as described in claim 9, characterized in that, The outer wall of the inner ring of the push ring (21) fits into the inner circle of the pole shoe end cap (14). The top end face of the inner ring of the push ring (21) has a flange (211) that overlaps the outer end face of the inner circle of the pole shoe end cap (14). The bottom end face of the inner ring of the push ring (21) is located inside the bottom end face of the outer ring of the push ring (22).

11. The electromagnetic actuator as described in claim 2, characterized in that, The inner wall of the barrier member (3) and / or the outer wall of the push ring (2) are coated with PTFE.

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