Rotary drive mechanism and stiffness valve

Abstract

The application belongs to the technical field of automobile suspension, and particularly relates to a rotary driving mechanism and a stiffness valve, which comprises a magnetic conduction unit arranged in a shell, a magnetic conduction cylinder and a rotating shaft, the rotating shaft is rotatably arranged in a cavity of the magnetic conduction cylinder, the rotating shaft comprises an extension end extending to the outside of the magnetic conduction cylinder; a winding unit is circumferentially wound on the outside of the magnetic conduction cylinder; a rotor unit is fixedly arranged on the extension end, and the outer circumferential surface of the rotor unit is provided with radially extending rotor magnetic poles; a stator unit is arranged on the outside of the rotor unit, the inner circumferential surface of the stator unit is provided with radially extending stator magnetic poles, and there is an air gap between the stator magnetic poles and the rotor magnetic poles; the magnetic conduction unit, the rotor unit and the stator unit are all composed of soft magnetic materials. The rotary driving mechanism provided in the application has a simple structure, the winding unit is circumferentially wound on the outside of the magnetic conduction cylinder, the winding method is simpler, the structure is more compact, more conductive wires can be wound in limited space, and a larger electromagnetic field can be provided.

Description

Technical Field

[0001] This application belongs to the field of automotive suspension technology, and particularly relates to a rotary drive mechanism and a stiffness valve. Background Technology

[0002] With the popularization and promotion of new energy vehicles, the application rate of air spring suspension systems has increased significantly. As the core actuator for adjusting the stiffness of air springs, the stiffness valve is one of the key components of the air suspension system, and its market demand continues to grow with the development of the new energy vehicle industry.

[0003] Most existing stiffness valves adopt a direct-acting electromagnetic structure. Their working principle is that the electromagnetic force generated by the coil interacts with the return spring force in the axial direction, driving the armature core to perform linear reciprocating motion, which in turn drives the plunger and sealing components at the front end to move, thereby realizing the on-off control of the air spring chamber and adjusting the spring stiffness.

[0004] Although such stiffness valves have advantages such as small size and simple structure, the linear reciprocating motion of the internal armature core inevitably causes vibration and noise problems.

[0005] The stiffness valve uses a rotary method to control the on / off state of the air spring chamber in order to improve the impact noise caused by the linear reciprocating motion of the armature core. However, due to the small size of the stiffness valve, it is difficult to install a rotary drive mechanism similar to a rotary motor structure. Summary of the Invention

[0006] To address the technical problem of small size and difficulty in installing rotary motor structures in existing stiffness valves, this application provides a rotary drive mechanism and a stiffness valve.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is a rotary drive mechanism, comprising:

[0008] A magnetic guiding unit is disposed within a housing and includes a magnetic guiding cylinder and a rotating shaft. The rotating shaft is rotatably disposed within the cavity of the magnetic guiding cylinder and includes an extension end extending to the outside of the magnetic guiding cylinder.

[0009] The winding unit is wound circumferentially around the outside of the magnetic cylinder;

[0010] A rotor unit is fixedly disposed at the extension end, and radially extending rotor magnetic poles are provided on the outer peripheral surface of the rotor unit;

[0011] A stator unit is fixedly disposed inside the housing and sleeved on the outside of the rotor unit. The inner circumferential surface of the stator unit is provided with radially extending stator magnetic poles, and there is an air gap between the stator magnetic poles and the rotor magnetic poles.

[0012] The magnetic conductive unit, rotor unit, and stator unit are all made of soft magnetic material.

[0013] In some embodiments, a winding frame is fixedly sleeved on the outside of the magnetic cylinder, and the winding unit is wound on the winding frame.

[0014] In some embodiments, the end of the magnetic cylinder away from the extension end is further provided with an outwardly facing flange, and a magnetic ring is further provided between the outer side of the flange and the housing.

[0015] In some embodiments, a cover is provided at one end of the housing away from the extension end, a connector is fixedly provided inside the cover, and a terminal block connected to the winding unit is provided inside the connector.

[0016] In some embodiments, a fixing block is fixedly disposed inside the magnetic cylinder, and the end of the rotating shaft away from the extension end is rotatably connected to the fixing block.

[0017] In some embodiments, the number of rotor magnetic poles is at least three and is evenly distributed along the circumferential direction, and the number of stator magnetic poles is the same as the number of rotor magnetic poles; in the initial position, one of the rotor magnetic poles is biased between two adjacent stator magnetic poles.

[0018] In some embodiments, a reset spring is further provided between the stator unit and the rotor unit.

[0019] The present invention also provides a stiffness valve, including the above-described rotary drive mechanism and valve seat. The valve seat is disposed at one end of the housing near the stator unit. The valve seat is provided with a first communication port and a second communication port. A coupling is fixed on the rotor unit. A rotary valve plate is connected to one end of the coupling. A fixed valve plate is disposed inside the valve seat. The rotary valve plate is rotated relative to the fixed valve plate and is configured to control the on / off state between the first communication port and the second communication port.

[0020] In some embodiments, both the rotary valve plate and the fixed valve plate are provided with vent holes. When the vent holes on the rotary valve plate and the fixed valve plate are staggered, the first communication port and the second communication port are blocked. When the vent holes on the rotary valve plate and the fixed valve plate are aligned, the first communication port and the second communication port are connected.

[0021] In some embodiments, the fixed valve plate is provided with a limiting mechanism that restricts the rotation angle of the rotary valve plate.

[0022] Beneficial effects: The rotary drive mechanism provided in this application has a simple structure. The winding unit is wound around the outside of the magnetic cylinder in a circumferential winding manner. Compared with the axial winding method, the winding method is simpler and the structure is more compact. It can wind more wires in a limited space, thereby providing a larger electromagnetic field.

[0023] The electromagnetic field generated by the winding unit is transmitted to the rotor unit using a magnetically conductive unit, which converts the circumferential magnetic field generated by the winding unit into a radial magnetic field, thereby generating magnetic torque between the rotor and stator units. The separate layout of the winding unit from the rotor and stator units significantly improves space utilization while providing sufficient magnetic field strength and magnetic torque. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the rotary drive mechanism;

[0025] Figure 2 This is a sectional view of the rotary drive mechanism;

[0026] Figure 3 A bottom view of the rotary drive mechanism;

[0027] Figure 4 This is a schematic diagram of the stiffness valve structure;

[0028] Figure 5 A schematic diagram of the assembly structure of the rotary valve plate and the fixed valve plate;

[0029] Figure 6 This is a cross-sectional view of the internal fit structure of another type of stiffness valve seat;

[0030] In the diagram: 1. Housing, 2. Winding unit, 21. Winding skeleton, 3. Magnetic cylinder, 4. Shaft, 41. Coupling, 42. Limiting protrusion, 43. Reset spring, 5. Rotor unit, 51. Rotor pole, 6. Stator unit, 61. Stator pole, 7. Cover, 71. Connector, 72. Terminal, 8. Fixing block, 9. Magnetic ring, 10. Valve seat, 101. First connecting port, 102. Second connecting port, 11. Rotary valve plate, 111. Vent hole, 112. Connecting sleeve, 12. Fixed valve plate, 121. Limiting sleeve, 122. Limiting groove, 13. Upper fixed valve plate, 14. Lower fixed valve plate. Detailed Implementation

[0031] The present application will be further described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative changes are within the protection scope of the present application.

[0032] like Figures 1-3 As shown, the rotary drive mechanism provided by the present invention includes a magnetic guiding unit, a winding unit 2, a rotor unit 5, and a stator unit 6.

[0033] like Figure 2 As shown, the magnetic guiding unit is disposed within the housing 1, including a magnetic guiding cylinder 3 and a rotating shaft 4. The rotating shaft 4 is rotatably disposed within the cavity of the magnetic guiding cylinder 3, and includes an extension end extending to the outside of the magnetic guiding cylinder 3. The winding unit 2 is wound circumferentially around the outside of the magnetic guiding cylinder 3. The rotor unit 5 is fixedly disposed at the extension end, and the outer circumferential surface of the rotor unit 5 is provided with radially extending rotor magnetic poles 51. The stator unit 6 is fixedly disposed within the housing 1 and sleeved on the outside of the rotor unit 5. The inner circumferential surface of the stator unit 6 is provided with radially extending stator magnetic poles 61, and there is an air gap between the stator magnetic poles 61 and the rotor magnetic poles 51. The magnetic guiding unit, rotor unit 5, and stator unit 6 are all made of soft magnetic material. When current is applied to the winding unit 2, the coil generates an axial magnetic field. The magnetic conductor unit transmits this magnetic field to the rotor unit 5, forming a radial magnetic field within the rotor unit 5. Due to the presence of the stator magnetic pole 61 and the rotor magnetic pole 51, a magnetic torque is generated between the rotor unit 5 and the stator unit 6 according to the principle of minimum magnetic reluctance. This causes relative rotation between the rotor magnetic pole 51 and the stator magnetic pole 61, thereby driving the rotor unit 5 to rotate. In this structure, the winding unit 2 is wound circumferentially. Compared to coils wound axially, the winding method is simpler, the structure is simpler, and more coils can be wound in a limited space to provide sufficient magnetic torque. Especially as a rotary drive mechanism for stiffness valves, it can meet the power requirements for driving the stiffness valve to open and close within a relatively small space.

[0034] To facilitate the winding and installation of winding unit 2, such as Figure 2 As shown, in some embodiments, a winding frame 21 is fixedly sleeved on the outside of the magnetic cylinder 3, and the winding unit 2 is wound on the winding frame 21. The winding frame 21 serves as a support frame for the winding unit 2 and ensures insulation between the winding unit 2, formed by winding enameled wire, and the magnetic cylinder 3. Specifically, the winding frame 21 is I-shaped, and the winding unit 2 is wound in a groove on the outer periphery of the winding frame 21. The magnetic cylinder 3 is sleeved and fixed inside the winding frame 21.

[0035] like Figure 2 As shown, in order to reduce magnetic loss and improve magnetic conductivity, in some embodiments, the end of the magnetic cylinder 3 away from the extension end is provided with an outward flange, and a magnetic ring 9 is provided between the outer side of the flange and the housing 1.

[0036] like Figure 1 and 2As shown, specifically, in some embodiments, a cover 7 is provided at the end of the housing 1 away from the extension end. A connector 71 is fixedly provided inside the cover 7, and a terminal block 72 connected to the winding unit 2 is provided inside the connector 71. The connector 71 and the terminal block 72 facilitate the connection of the winding unit 2 to an external power source.

[0037] like Figure 2 As shown, to facilitate the installation of the rotating shaft 4, in some embodiments, a fixing block 8 is fixedly installed inside the magnetic cylinder 3, and the end of the rotating shaft 4 away from the extension end is rotatably connected to the fixing block 8. Specifically, a bearing is installed at one end of the fixing block 8, and the rotating shaft 4 is rotatably connected to the fixing block 8 through the bearing.

[0038] like Figure 1 and 3 As shown, in some embodiments, the number of rotor magnetic poles 51 is at least three, and they are evenly distributed along the circumferential direction. The number of stator magnetic poles 61 is the same as the number of rotor magnetic poles 51. In the initial position, one rotor magnetic pole 51 is biased between two adjacent stator magnetic poles 61. Specifically, as... Figure 1 and 3 As shown, both the rotor magnetic poles 51 and the stator magnetic poles 61 have three poles each, and they are evenly distributed along the circumference. In the initial position, as... Figure 3 As shown, a rotor pole 51 is located between two adjacent stator poles 61, and this rotor pole 51 is closer to one of the stator poles 61. After the winding unit 2 is energized, according to the principle of minimum magnetic reluctance, a magnetic torque is generated between the rotor pole 51 and the stator pole 61. The rotor pole 51 will rotate towards the closer stator pole 61, which will drive the rotor unit 5 and the shaft 4 to rotate, thereby driving the stiffness valve to perform the corresponding operation. Under the condition of no other restrictions, according to the principle of minimum magnetic reluctance, the rotor pole 51 will rotate at most until it corresponds to the position of the stator pole 61, that is, the rotor pole 51 and the stator pole 61 are located in the same radial direction, and cannot continue to rotate. This avoids excessive rotation and perfectly matches the working state of the stiffness valve. The present invention will be described in detail below.

[0039] like Figure 3As shown, in order to enable the rotor unit 5 to automatically reset after rotation, in some embodiments, a reset spring 43 is also provided between the stator unit 6 and the rotor unit 5. When the winding unit 2 is energized, during the rotation of the rotor unit 5 from its initial position, the reset spring 43 is compressed and deformed to store elastic potential energy. After the power is turned off, the magnetic torque between the rotor unit 5 and the stator unit 6 disappears, the reset spring 43 releases its elastic potential energy and returns to its original shape, thereby driving the rotor unit 5 to rotate and reset to its initial position. The structure is simple, and the space between the rotor magnetic pole 51 and the stator magnetic pole 61 naturally forms the installation space for the reset spring 43, making full use of the space.

[0040] like Figure 4 As shown, the present invention also provides a stiffness valve, including the aforementioned rotary drive mechanism and a valve seat 10. The valve seat 10 is disposed at one end of the housing 1 near the stator unit 6. The valve seat 10 is provided with a first communication port 101 and a second communication port 102, as shown. Figure 2 and 3 As shown, a coupling 41 is fixed on the rotor unit 5, such as... Figure 4 and 5 As shown, one end of the coupling 41 is connected to a rotary valve plate 11, and a fixed valve plate 12 is disposed within the valve seat 10. The rotary valve plate 11 is rotated relative to the fixed valve plate 12 to control the opening and closing of the first communication port 101 and the second communication port 102. When the rotary drive mechanism rotates, it drives the rotary valve plate 11 to rotate. The rotation of the rotary valve plate 11 relative to the fixed valve plate 12 can realize the control of the opening and closing of the first communication port 101 and the second communication port 102. This stiffness valve is installed on the air spring of the automobile suspension. The first communication port 101 is connected to the secondary chamber of the air spring, and the second communication port 102 is connected to the main chamber of the air spring. The opening and closing of the first communication port 101 and the second communication port 102 is the opening and closing of the main chamber and the secondary chamber. The rotation of the rotary valve plate 11 can realize the stiffness adjustment of the air spring.

[0041] like Figure 4 and 5As shown, specifically, in some embodiments, both the rotary valve plate 11 and the fixed valve plate 12 are provided with vent holes 111. When the vent holes 111 on the rotary valve plate 11 and the fixed valve plate 12 are staggered, the first connecting port 101 and the second connecting port 102 are blocked; when the vent holes 111 on the rotary valve plate 11 and the fixed valve plate 12 are in corresponding positions, the first connecting port 101 and the second connecting port 102 are connected. The rotary valve plate 11 and the fixed valve plate 12 are fitted together. The rotation of the rotary valve plate 11 causes the vent hole 111 on it to be in different positions. When the vent hole 111 on the rotary valve plate 11 and the vent hole 111 on the fixed valve plate 12 are in the same position, the vent holes 111 on the two valve plates are connected to form a connecting channel, and the main chamber and the secondary chamber of the air spring are connected. However, when the vent hole 111 on the rotary valve plate 11 and the vent hole 111 on the fixed valve plate 12 are misaligned, the vent holes 111 on the two valve plates are not connected, and the main chamber and the secondary chamber of the air spring are blocked from connecting.

[0042] like Figure 4 and 5 As shown, specifically, the vent holes 111 on the rotary valve plate 11 are configured as fan-shaped holes, with a total of 8 holes. The angle of each fan-shaped area is 22.5°, and the 8 fan-shaped holes are evenly distributed around the circumference of the rotary valve plate 11. The corresponding fixed valve plate 12 also has vent holes 111 with the same structure. If the initial position is such that the vent holes 111 of the rotary valve plate 11 and the vent holes 111 of the fixed valve plate 12 are connected, then it is only necessary to control the rotary valve plate 11 to rotate 22.5° to offset the vent holes 111 of the rotary valve plate 11 and the vent holes 111 of the fixed valve plate 12, so that they are not connected. From the above description of the rotary drive mechanism, the rotor unit 5 can only rotate a certain angle relative to the stator unit 6, which fully meets the requirement of rotating the rotary valve plate 11 at a certain angle in this stiffness valve.

[0043] like Figure 3 and 5As shown, to further limit the rotation angle of the rotary valve plate 11, in some embodiments, the fixed valve plate 12 is provided with a limiting mechanism to limit the rotation angle of the rotary valve plate 11. Specifically, the rotary valve plate 11 can be disposed at the bottom of the fixed valve plate 12, and a limiting sleeve 121 is provided on the fixed valve plate 12. The coupling 41 passes through the limiting sleeve 121 and is connected to the rotary valve plate 11. The coupling 41 is provided with a limiting protrusion 42, and the limiting sleeve 121 is provided with a limiting groove 122, forming a limiting mechanism. The limiting protrusion 42 is located in the limiting groove 122. When the rotary valve plate 11 is in the initial position, under the action of the reset spring 43, one side wall of the limiting protrusion 42 is closed with the limiting sleeve 42. One side wall of the groove 122 abuts against and fits, keeping the rotary valve plate 11 in its initial position. When the rotary drive mechanism is energized, the rotary valve plate 11 can only be driven to rotate until the other side wall of the limiting protrusion 42 abuts against and fits against the other side wall of the limiting groove 122, and cannot continue to rotate. After the power is cut off, the rotary valve plate 11 rotates in the opposite direction to the initial position under the action of the reset spring 43, effectively preventing the excessive rotation of the rotary valve plate 11, achieving precise limiting, and effectively ensuring the sealing effectiveness between the rotary valve plate 11 and the fixed valve plate 12.

[0044] Furthermore, since a pressure difference may exist between the main chamber and the auxiliary chamber of the air spring, especially during vehicle operation, the pressure in the main chamber may be greater than or less than that in the auxiliary chamber. In the aforementioned scheme using a rotary valve plate 11 and a fixed valve plate 12, with the rotary valve plate 11 located below the fixed valve plate 12, if the vent holes 111 on the fixed valve plate 12 and the rotary valve plate 11 are misaligned, and the pressure on the side of the fixed valve plate 12 away from the rotary valve plate 11 is greater, the rotary valve plate 11 may be pushed open and detached from the fixed valve plate 12 under pressure, or may be partially deformed, leading to a failure of the seal between the fixed valve plate 12 and the rotary valve plate 11. To avoid the above situation, this application further designs an optimized scheme, as follows.

[0045] like Figure 6As shown, the fixed valve plate 12 includes an upper fixed valve plate 13 and a lower fixed valve plate 14, and a rotating valve plate 11 is movably disposed between the upper fixed valve plate 13 and the lower fixed valve plate 14. The upper fixed valve plate 13 and the lower fixed valve plate 14 have corresponding vent holes 111. One end of the coupling 41 passes through the upper fixed valve plate 13 and connects to the rotating valve plate 11. Specifically, a limiting sleeve 121 is disposed on the upper fixed valve plate 13, and a connecting sleeve 112 is disposed on the rotating valve plate 11. The connecting sleeve 112 is axially limited and slidably sleeved with one end of the coupling 41 via a spline, thereby allowing the connecting sleeve 112 to slide axially along the coupling 41. When the main chamber and the auxiliary chamber are not connected, if the pressure in the main chamber near the lower fixed valve plate 14 is greater than the pressure in the auxiliary chamber near the upper fixed valve plate 13, the pressure at the bottom of the rotating valve plate 11 will be greater than the pressure at the top. Under the action of the pressure difference, the rotating valve plate 11 moves towards the upper fixed valve plate 13 and eventually comes into contact with the surface of the upper fixed valve plate 13, sealing it. Conversely, if the pressure in the auxiliary chamber is greater than the pressure in the main chamber, the rotating valve plate 11 moves towards the lower fixed valve plate 14 and eventually comes into contact with the surface of the fixed valve plate 12, sealing it. When the pressure in the main chamber and the auxiliary chamber are equal, even if the rotating valve plate 11 is located between the upper fixed valve plate 13 and the lower fixed valve plate 14, whether the main chamber and the auxiliary chamber are connected will not directly affect the stiffness of the gas spring. Therefore, it is permissible for the rotating valve plate 11 to float between the upper fixed valve plate 13 and the lower fixed valve plate 14 without coming into contact with either of them. The positional transition of the rotary valve plate 11 between the lower fixed valve plate 14 and the upper fixed valve plate 13 under the action of pressure difference is very rapid, and the gas leakage generated in this process is negligible.

[0046] Specifically, the distance between the lower surface of the upper fixed valve plate 13 and the upper surface of the lower fixed valve plate 14 is 0.05~0.5mm larger than the thickness of the rotary valve plate 11, preferably 0.2mm. This is to balance the frictional resistance and sealing reliability between the rotary valve plate 11 and the upper and lower fixed valve plates 13 and 14.

[0047] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this application.

Claims

1. A rotary drive mechanism, characterized in that, include A magnetic guiding unit is disposed inside a housing (1) and includes a magnetic guiding cylinder (3) and a rotating shaft (4). The rotating shaft (4) is rotatably disposed inside the cavity of the magnetic guiding cylinder (3). The rotating shaft (4) includes an extension end extending to the outside of the magnetic guiding cylinder (3). The winding unit (2) is wound circumferentially around the outside of the magnetic cylinder (3); The rotor unit (5) is fixedly disposed at the extension end, and the outer peripheral surface of the rotor unit (5) is provided with radially extending rotor magnetic poles (51). The stator unit (6) is fixedly disposed inside the housing (1) and sleeved on the outside of the rotor unit (5). The inner circumferential surface of the stator unit (6) is provided with radially extending stator magnetic poles (61), and there is an air gap between the stator magnetic poles (61) and the rotor magnetic poles (51). The magnetic conductive unit, rotor unit (5) and stator unit (6) are all made of soft magnetic material.

2. The rotary drive mechanism according to claim 1, characterized in that, The magnetic cylinder (3) is fixedly fitted with a winding frame (21), and the winding unit (2) is wound on the winding frame (21).

3. The rotary drive mechanism according to claim 1, characterized in that, The magnetic cylinder (3) is provided with an outward flange at one end away from the extension end, and a magnetic ring (9) is provided between the outer side of the flange and the shell (1).

4. The rotary drive mechanism according to claim 1, characterized in that, The housing (1) is provided with a cover (7) at one end away from the extension end. A connector (71) is fixedly provided inside the cover (7). A terminal (72) connected to the winding unit (2) is provided inside the connector (71).

5. The rotary drive mechanism according to claim 1, characterized in that, The magnetic cylinder (3) is fixedly provided with a fixing block (8), and the end of the rotating shaft (4) away from the extension end is rotatably connected to the fixing block (8).

6. The rotary drive mechanism according to claim 1, characterized in that, The rotor magnetic poles (51) are at least three in number and are evenly distributed along the circumference. The number of stator magnetic poles (61) is the same as the number of rotor magnetic poles (51). In the initial position, one of the rotor magnetic poles (51) is biased between two adjacent stator magnetic poles (61).

7. The rotary drive mechanism according to claim 1 or 6, characterized in that, A reset spring (43) is also provided between the stator unit (6) and the rotor unit (5).

8. A stiffness valve, characterized in that, The device includes a rotary drive mechanism and a valve seat (10) as described in any one of claims 1 to 7. The valve seat (10) is disposed at one end of the housing (1) near the stator unit (6). The valve seat (10) is provided with a first communication port (101) and a second communication port (102). A coupling (41) is fixed on the rotor unit (5). A rotary valve plate (11) is connected to one end of the coupling (41). A fixed valve plate (12) is disposed inside the valve seat (10). The rotary valve plate (11) is rotated relative to the fixed valve plate (12) and is configured to control the opening and closing between the first communication port (101) and the second communication port (102).

9. The stiffness valve according to claim 8, characterized in that, Both the rotary valve plate (11) and the fixed valve plate (12) are provided with vent holes (111). When the vent holes (111) on the rotary valve plate (11) and the fixed valve plate (12) are staggered, the first connecting port (101) and the second connecting port (102) are blocked. When the vent holes (111) on the rotary valve plate (11) and the fixed valve plate (12) are in corresponding positions, the first connecting port (101) and the second connecting port (102) are connected.

10. The stiffness valve according to claim 9, characterized in that, The fixed valve plate (12) is provided with a limiting mechanism to restrict the rotation angle of the rotating valve plate (11).

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