Head shaking mechanism and fan

Abstract

The application provides a head-shaking mechanism and a fan, and belongs to the field of household appliances. The head-shaking mechanism comprises a fixed seat, a driving shaft, an inner gear, a transmission gear and a motor. The driving shaft is located in the fixed seat and rotationally cooperates with the fixed seat. An annular cavity is formed between the driving shaft and the fixed seat. The driving shaft has a cavity. The first end of the driving shaft has a first opening communicating with the cavity. The sidewall of the driving shaft has a second opening communicating the cavity and the annular cavity. The inner gear is located in the annular cavity, coaxially arranged with the driving shaft and connected with the driving shaft. The inner gear and the second opening are circumferentially staggered with each other. The transmission gear is located on the inner side of the inner gear and engages with the inner gear. During the rotation of the driving shaft, the cable passing through the second opening always maintains a certain distance from the inner gear and is not scratched by the inner gear, thereby reducing the risk of cable damage and prolonging the service life of the fan.

Description

Technical Field

[0001] This application relates to the field of home appliances, and in particular to an oscillating mechanism and a fan. Background Technology

[0002] Fans are widely used in residential and public buildings such as homes, offices, hotels, shopping malls, hospitals, and schools. They accelerate airflow and provide cooling. To allow fans to blow air over a wider range of angles, some fans have an oscillating function.

[0003] A fan with an oscillating function typically consists of a base, an oscillation mechanism, and a fan head, with the oscillation mechanism connecting the fan head and the base. During operation, the fan head oscillates back and forth within a certain angle range under the action of the oscillation mechanism. Some of the fan's control components, such as circuit boards, are usually located in the part of the oscillation mechanism that remains relatively stationary relative to the base, or directly within the fan base. Cables connected to the fan head, such as power cords, are connected to the circuit board or other electrical structures.

[0004] Because the oscillation mechanism moves continuously during the operation of the fan, the cables inside the oscillation mechanism are prone to rubbing against other structures, resulting in a high risk of cable damage. Utility Model Content

[0005] This application provides an oscillating mechanism and a fan, which helps to reduce the risk of cable damage. The technical solution is as follows:

[0006] In a first aspect, embodiments of this application provide a head-shaking mechanism, the head-shaking mechanism comprising:

[0007] Fixed base;

[0008] A drive shaft is located in the fixed base and rotates with the fixed base. An annular cavity is formed between the drive shaft and the fixed base. The drive shaft has a cavity inside. The first end of the drive shaft has a first opening that communicates with the cavity. The side wall of the drive shaft has a second opening that connects the cavity and the annular cavity.

[0009] An internal gear is located in the annular cavity, coaxially arranged and connected to the drive shaft, and the internal gear and the second opening are offset from each other in the circumferential direction.

[0010] A transmission gear is located inside the internal gear and meshes with the internal gear;

[0011] The motor is located in the fixed base and at the second end of the drive shaft, and is used to drive the transmission gear to rotate.

[0012] In some examples, the drive shaft includes a first shaft and a second shaft, the first shaft and the second shaft being coaxially arranged and connected;

[0013] The first opening and the second opening are located on the first shaft, and the internal gear is located outside the second shaft and connected to the second shaft.

[0014] In some examples, the first shaft is detachably connected to the second shaft.

[0015] In some examples, the first shaft has a first circumferential positioning structure at the end near the second shaft, and the second shaft has a second circumferential positioning structure at the end near the first shaft, with the first circumferential positioning structure cooperating with the second circumferential positioning structure.

[0016] In some examples, the internal gear is fan-shaped.

[0017] In some examples, the internal gear has a receiving groove on the side near the motor, the teeth of the internal gear are located on the side wall of the receiving groove, and the transmission gear is located in the receiving groove.

[0018] In some examples, the oscillating mechanism further includes a fixed bracket located within the fixed base and between the second end of the drive shaft and the motor. The fixed bracket is connected to the fixed base, and the drive shaft is rotatably engaged with the fixed bracket.

[0019] In some examples, the fixing bracket has a raised positioning shaft in the middle, which is coaxially inserted into the second end of the drive shaft and has a clearance fit with the drive shaft;

[0020] The fixed bracket also has an eccentric hole through which the motor shaft passes and is connected to the transmission gear.

[0021] In some examples, the end face of the motor has an annular boss that is arranged around and coaxial with the motor shaft, and the annular boss is located in the eccentric hole and transitionally fitted with the eccentric hole.

[0022] As an example, the fixing bracket has a first notch that is offset from the internal gear in the circumferential direction.

[0023] In some examples, the first notch and the second opening at least partially overlap in the circumferential direction.

[0024] In some examples, the fixed bracket has a first limiting rib on the side near the drive shaft, and the internal gear is located between the drive shaft and the first limiting rib.

[0025] Optionally, the gap width between the first limiting rib and the internal gear is 0.2 to 0.8 times the tooth height of the internal gear.

[0026] In some examples, the fixing bracket has a second limiting rib on the side near the motor, and the second limiting rib is distributed around the motor.

[0027] In some examples, the second limiting rib has a second notch, and the sidewall of the second notch has a groove;

[0028] The outer wall of the motor is connected to an ear plate, which is located in the second notch and at least partially within the slot.

[0029] In some examples, the oscillating mechanism further includes a bushing located in the fixed base and coaxially sleeved outside the drive shaft, the bushing having a third opening on its sidewall that exposes the second opening.

[0030] In some examples, the inner wall of the bushing has two first stops arranged circumferentially spaced, and the outer wall of the drive shaft has a second stop located between the two first stops; or,

[0031] The inner wall of the bushing has a first stop, and the outer wall of the drive shaft has two second stops, which are arranged circumferentially at intervals, with the first stop located between the two second stops.

[0032] Secondly, embodiments of this application also provide a fan, the fan including a base, a fan head circuit board and an oscillation mechanism as described in the first aspect, the fixed seat of the oscillation mechanism being connected to the base, the fan head being connected to the first end of the drive shaft, the circuit board being located on the side of the motor away from the fan head, and the cable of the fan head passing through the first opening, the cavity, the second opening and the annular cavity and being connected to the circuit board.

[0033] The beneficial effects of the technical solutions provided in this application include at least the following:

[0034] A drive shaft and motor are installed within a fixed base. The motor drives the drive shaft to rotate, causing the fan head to oscillate. An annular cavity is formed between the drive shaft and the fixed base. The drive shaft has a cavity within it, a first opening at its first end, and a second opening on its side wall. This allows the cable connected to the fan head to pass through the first opening, the cavity, the second opening, and the annular cavity during fan installation, before exiting from the annular cavity. The motor transmits power to the drive shaft via meshing transmission gears and an internal gear. The internal gear is coaxially arranged and connected to the drive shaft. The rotation of the transmission gear drives the internal gear, causing the drive shaft to rotate. Because the internal gear and the second opening are offset circumferentially, the cable exiting the second opening maintains a certain distance from the internal gear during drive shaft rotation, preventing it from being scraped by the gear and reducing the risk of cable damage, thus extending the fan's lifespan. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a fan provided in an embodiment of this application;

[0037] Figure 2 This is a partial structural schematic diagram of a fan provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the structure of a head-shaking mechanism provided in an embodiment of this application;

[0039] Figure 4 This is a partial structural schematic diagram of a head-shaking mechanism provided in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of a drive shaft and internal gear provided in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the structure of an arc-shaped internal gear and a second shaft provided in an embodiment of this application;

[0042] Figure 7 This is a schematic diagram of the assembly of a bushing and a drive shaft provided in an embodiment of this application;

[0043] Figure 8 This is a partial structural schematic diagram of a head-shaking mechanism provided in an embodiment of this application;

[0044] Figure 9 This is an assembly diagram of a motor and a fixed bracket provided in an embodiment of this application.

[0045] Icon labels:

[0046] Base: 10; Oscillating Mechanism: 20; Fan Head: 30; Head Support: 31; Cable: 32; Circuit Board: 33; Mounting Base: 21; Drive Shaft: 22; Internal Gear: 23; Receiving Slot: 23a; Transmission Gear: 24; Motor: 25; Annular Cavity: 21a; Hollow Cavity: 22a; First Opening: 22b; Second Opening: 22c; First Shaft: 221; Second Shaft: 222; First Circumferential Positioning Structure: 2211; Second Circumferential Positioning Structure : 2221; Arc-shaped rack section: 231; Fan ring plate: 232; Baffle: 233; Bushing: 26; Bearing: 220; Third opening: 26a; First stop block: 261; Second stop block: 2212; Fixed bracket: 27; Positioning shaft: 271; Eccentric hole: 27a; Annular boss: 251; First limiting rib: 272; Second limiting rib: 273; First notch: 27b; Second notch: 273a; Slot: 273b; Ear plate: 252. Detailed Implementation

[0047] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0048] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0049] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0050] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0051] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" means two or more.

[0053] Figure 1 This is a schematic diagram of the structure of a fan provided in an embodiment of this application. Figure 1 As shown, the fan includes a base 10, an oscillation mechanism 20, and a circuit board. Figure 1 (Not shown) and fan head 30. Oscillating mechanism 20 is connected to base 10, and fan head 30 is connected to oscillating mechanism 20. During fan operation, oscillating mechanism 20 can drive fan head 30 to oscillate relative to base 10.

[0054] Figure 2 This is a partial structural diagram of a fan provided in an embodiment of this application. Figure 2 The base 10 is omitted, and at least parts of the oscillation mechanism 20 and fan head 30 are also omitted. For example... Figure 2 As shown, the fan head 30 includes a head bracket 31, a fan motor, and fan blades. The fan motor is fixed to the head bracket 31, and the fan blades are connected to the fan motor's shaft. The fan motor's cable 32 extends into the oscillation mechanism 20 and is connected to electrical structures such as the circuit board 33 arranged in the oscillation mechanism 20. The fan motor's cable 32 includes, but is not limited to, power supply cables and control cables.

[0055] The oscillating mechanism 20 may include a cylindrical housing that forms the external shape of the oscillating mechanism 20, see... Figure 1 As shown, the cylindrical outer shell serves both protective and aesthetic purposes. Figure 2 To show the internal structure, the cylindrical outer shell has been omitted.

[0056] In some other possible implementations, electrical structures such as circuit board 33 can also be arranged in base 10, and the fan motor cable 32 passes through oscillation mechanism 20 and extends into base 10.

[0057] Figure 3 This is a schematic diagram of a swaying mechanism provided in an embodiment of this application. The diagram is used to illustrate the relationship between the swaying mechanism 20 and the cable 32. Figure 3 The image also shows a section of cable 32. (For example...) Figure 3 As shown, the swaying mechanism 20 includes a fixed base 21, a drive shaft 22, an internal gear 23, a transmission gear 24, and a motor 25.

[0058] The drive shaft 22 is located in the fixed base 21. The drive shaft 22 is rotatably engaged with the fixed base 21, and an annular cavity 21a is formed between the drive shaft 22 and the fixed base 21.

[0059] The mounting base 21 can be assembled into the aforementioned cylindrical outer shell. The mounting base 21 can be detachably connected to the cylindrical outer shell, or it can be an integral structure with the cylindrical outer shell. In some examples, the cylindrical outer shell may not be provided.

[0060] Figure 4 This is a partial structural schematic diagram of a head-shaking mechanism provided in an embodiment of this application. Figure 4 To demonstrate the transmission gear 24, a portion of the internal gear 23 has been removed. (See example...) Figure 4 As shown, the drive shaft 22 has a cavity 22a inside, the first end of the drive shaft 22 has a first opening 22b communicating with the cavity 22a, and the side wall of the drive shaft 22 has a second opening 22c, which connects the cavity 22a and the annular cavity 21a.

[0061] The internal gear 23 is located in the annular cavity 21a, and is coaxially arranged and connected to the drive shaft 22. The internal gear 23 and the second opening 22c are offset from each other in the circumferential direction. The transmission gear 24 is located inside the internal gear 23 and meshes with it. The motor 25 is located in the fixed base 21 and at the second end of the drive shaft 22. The motor 25 is used to drive the transmission gear 24 to rotate.

[0062] The internal gear 23 and the second opening 22c are offset from each other in the circumferential direction. This means that on a plane perpendicular to the axis of the drive shaft 22, the orthographic projection of the internal gear 23 does not overlap with the orthographic projection of the second opening 22c, and the orthographic projection of the range of motion of the internal gear 23 does not overlap with the orthographic projection of the second opening 22c. In other words, during the rotation of the internal gear 23, the orthographic projection of the internal gear 23 and the orthographic projection of the second opening 22c never overlap.

[0063] As an example, on a plane perpendicular to the axis of the drive shaft 22, the angle between the bisector of the central angle corresponding to the orthographic projection of the internal gear 23 and the bisector of the central angle corresponding to the orthographic projection of the second opening 22c can be 180°. The central angle corresponding to the orthographic projection of the internal gear 23 is the angle formed by the lines connecting the two ends of the orthographic projection of the internal gear 23 to the axis of the drive shaft 22. Exemplarily, this angle can not exceed 180°; the central angle corresponding to the orthographic projection of the second opening 22c is the angle formed by the lines connecting the two ends of the orthographic projection of the second opening 22c to the axis of the drive shaft 22. Exemplarily, this angle can not exceed 180°.

[0064] A drive shaft 22 and a motor 25 are installed within the fixed base 21. The motor 25 drives the drive shaft 22 to rotate, thereby causing the fan head to oscillate. An annular cavity 21a is formed between the drive shaft 22 and the fixed base 21. The drive shaft 22 has a cavity 22a, a first opening 22b at its first end, and a second opening 22c on its side wall. This allows the cable 32 connected to the fan head to pass through the first opening 22b, the cavity 22a, the second opening 22c, and the annular cavity 21a during fan installation, before exiting from the annular cavity 21a. The motor 25 transmits power to the drive shaft 22 via a meshing transmission gear 24 and an internal gear 23. The internal gear 23 is coaxially arranged and connected to the drive shaft 22. The rotation of the transmission gear 24 drives the internal gear 23 to rotate, thus rotating the drive shaft 22. The transmission gear 24 is located inside the internal gear 23. Compared to external gears, using internal gears helps to reduce the size of the oscillation mechanism 20.

[0065] The circuit board 33 is located on the side of the motor 25 away from the fan head 30. The cable 32 of the fan head 30 passes through the first opening 22b, the cavity 22a, the second opening 22c, and the annular cavity 21a and is connected to the circuit board 33. Since the internal gear 23 and the second opening 22c are offset from each other in the circumferential direction, the cable 32 passing through the second opening 22c and the internal gear 23 always maintain a certain distance during the rotation of the drive shaft 22, and will not be scratched by the internal gear 23, thereby reducing the risk of damage to the cable 32 and helping to extend the service life of the fan.

[0066] The mounting base 21 is cylindrical and provides internal space to accommodate the drive shaft 22, internal gear 23, transmission gear 24, and motor 25.

[0067] Figure 5 This is a schematic diagram of a drive shaft and internal gear provided in an embodiment of this application. Figure 5 As shown, the drive shaft 22 includes a first shaft body 221 and a second shaft body 222, which are coaxially arranged and connected.

[0068] The first opening 22b and the second opening 22c are located on the first shaft 221, and the internal gear 23 is located outside the second shaft 222 and connected to the second shaft 222.

[0069] In other words, the second opening 22c and the internal gear 23 are also offset axially, with the second opening 22c closer to the first end of the drive shaft 22 and the internal gear 23 closer to the second end of the drive shaft 22. The second opening 22c's proximity to the first end of the drive shaft 22 facilitates the passage of the fan motor cable 32 through the drive shaft 22 during assembly. The internal gear 23's proximity to the second end of the drive shaft 22 facilitates the arrangement of the internal gear 23, the transmission gear 24, and the motor 25.

[0070] In some examples, the first shaft 221 and the second shaft 222 can be an integral structural component, that is, the first shaft 221 and the second shaft 222 are a whole.

[0071] In this embodiment of the application, as an example, the first shaft 221 and the second shaft 222 are two independent structural components, and the first shaft 221 and the second shaft 222 are detachably connected.

[0072] Setting the first shaft 221 and the second shaft 222 as two independent structural components facilitates the separate machining of the second opening 22c and the internal gear 23, thereby improving the machining accuracy of important structures and reducing vibrations and noise generated during the operation of the oscillating mechanism.

[0073] like Figure 5 As shown, the first shaft 221 has a first circumferential positioning structure 2211 at one end near the second shaft 222, and the second shaft 222 has a second circumferential positioning structure 2221 at one end near the first shaft 221. The first circumferential positioning structure 2211 and the second circumferential positioning structure 2221 cooperate with each other.

[0074] As an example, one of the first circumferential positioning structure 2211 and the second circumferential positioning structure 2221 can be a groove and the other can be a protrusion. The protrusion is accommodated in the groove and forms a transition fit with the groove. That is, the protrusion and the groove can be a clearance fit or an interference fit.

[0075] In this example, the first circumferential positioning structure 2211 is a protrusion, and the second circumferential positioning structure 2221 is a groove. The cooperation between the protrusion and the groove prevents the first shaft 221 and the second shaft 222 from rotating relative to each other.

[0076] In addition, the first circumferential positioning structure 2211 and the second circumferential positioning structure 2221 can also play a foolproof role in the process of connecting the first shaft 221 and the second shaft 222, so that after the first shaft 221 and the second shaft 222 are assembled together, the internal gear 23 and the second opening 22c are offset from each other in the circumferential direction.

[0077] The first circumferential positioning structure 2211 can be offset, meaning that the first circumferential positioning structure 2211 can be located outside the center of the end face of the first shaft 221. When the protrusion is non-cylindrical, the first circumferential positioning structure 2211 can also be located at the center of the end face of the first shaft 221.

[0078] In some other possible implementations, the first circumferential positioning structure 2211 may include multiple protrusions, and the second circumferential positioning structure 2221 may include multiple grooves, with the multiple protrusions and multiple grooves arranged in a one-to-one correspondence.

[0079] For example, the first shaft 221 and the second shaft 222 can be connected by screws. Both the first shaft 221 and the second shaft 222 can be hollow structures, and the opposite ends of the first shaft 221 and the second shaft 222 are connected by screws.

[0080] Figure 6 This is a schematic diagram of the structure of an internal gear and a second shaft provided in an embodiment of this application. Figure 6 As shown, the internal gear 23 can be sector-shaped. A sector-shaped gear occupies less space in the circumferential direction, making it less likely to rub against the cable 32.

[0081] The internal gear 23 has a receiving groove 23a on the side near the motor 25. The teeth of the internal gear 23 are located on the side wall of the receiving groove 23a, and the transmission gear 24 is located in the receiving groove 23a.

[0082] Arranging the transmission gear 24 in the receiving groove 23a and meshing with the internal gear 23 can prevent foreign objects from getting stuck between the transmission gear 24 and the internal gear 23. Placing lubricant between the teeth of the transmission gear 24 and the internal gear 23 can also prevent dust from falling into the lubricant, which helps to delay the deterioration of the lubricant.

[0083] For example, the internal gear 23 includes an arc-shaped rack portion 231, a fan-shaped ring plate 232, and two baffles 233. The arc-shaped rack portion 231 is coaxially arranged with the drive shaft 22, and each end of the arc-shaped rack portion 231 is connected to the drive shaft 22 via a baffle 233. The fan-shaped ring plate 232 is located on the side of the arc-shaped rack portion 231 near the first end of the drive shaft 22, and is connected to the drive shaft 22, the arc-shaped rack portion 231, and the two baffles 233. The drive shaft 22, the arc-shaped rack portion 231, the fan-shaped ring plate 232, and the two baffles 233 form a receiving groove 23a.

[0084] In some examples, the second shaft 222, the arc-shaped rack portion 231, the fan ring plate 232, and the two baffles 233 can be a single integral structure, i.e., a whole unit.

[0085] In other examples, the second shaft 222, the arc-shaped rack portion 231, the fan ring plate 232, and the two baffles 233 can also be connected by welding, such as metal welding or ultrasonic welding. The internal gear 23 can also be detachably connected to the second shaft 222, for example, by a key connection. Using a detachable connection method allows for convenient separate machining of the second shaft 222 and the internal gear 23.

[0086] like Figure 3 As shown, the oscillating mechanism 20 also includes a bushing 26, which is located in the fixed base 21 and coaxially sleeved on the drive shaft 22. The bushing 26 can be used to support the first shaft 221, allowing the drive shaft 22 to rotate within the fixed base 21.

[0087] In some examples, a bearing 220 may be provided between the bushing 26 and the first shaft 221 to reduce the resistance encountered when the drive shaft 22 rotates. The end of the first shaft 221 near the second shaft 222 is clearance-fitted with the bushing 26 to reduce radial runout during the rotation of the first shaft 221.

[0088] like Figure 3 As shown, the side wall of the bushing 26 has a third opening 26a that exposes the second opening 22c. The bushing 26 is fixedly connected to the mounting base 21. During the rotation of the drive shaft 22 relative to the bushing 26, the third opening 26a and the second opening 22c are always partially opposite each other. The cable 32 of the fan head 30 can be led out from the second opening 22c and the third opening 26a without being sheared by the bushing 26 and the drive shaft 22.

[0089] In this example, the first shaft 221 can be located inside the bushing 26, and the second shaft 222 can be located outside the bushing 26.

[0090] Figure 7 This is a schematic diagram of the assembly of a bushing and a drive shaft provided in an embodiment of this application. Figure 7 At least part of the sidewall of the bushing is omitted. For example... Figure 7 As shown, the inner wall of the bushing 26 has two first stops 261, which are arranged circumferentially. The outer wall of the drive shaft 22 has a second stop 2212, which is located between the two first stops 261.

[0091] During operation, the fan head 30 rotates at an angle less than 360°, meaning the relative rotation angle between the drive shaft 22 and the bushing 26 is less than 360°. For example, it can be 120° to 180°. In this example, by setting a first stop 261 and a second stop 2212, the second stop 2212 moves between the two first stops 261 during the rotation of the drive shaft 22. The two first stops 261 limit the range of movement of the second stop 2212, thus limiting the rotation range of the drive shaft 22.

[0092] In some other possible implementations, a first stop 261 can be provided on the inner side wall of the bushing 26, and two second stops 2212 can be provided on the outer side wall of the drive shaft 22. The two first stops 261 are arranged circumferentially and are located between the two second stops 2212, which can also limit the rotation range of the drive shaft 22.

[0093] like Figure 3 As shown, the oscillating mechanism 20 also includes a fixed bracket 27, which is located inside the fixed base 21 and between the second end of the drive shaft 22 and the motor 25. The fixed bracket 27 is connected to the fixed base 21, and the drive shaft 22 is rotatably engaged with the fixed bracket 27.

[0094] The fixed bracket 27 provides support for the second end of the drive shaft 22, making the drive shaft 22 more stable during rotation.

[0095] In this example, the first shaft 221 is located within the bushing 26, which provides support for the first shaft 221. The second shaft 222 is located outside the bushing 26 and is supported by the fixing bracket 27.

[0096] For example, the fixing bracket 27 may be disc-shaped.

[0097] Figure 8 This is a partial structural schematic diagram of a head-shaking mechanism provided in an embodiment of this application. For example... Figure 8 As shown, the fixed bracket 27 has a protruding positioning shaft 271 in the middle. The positioning shaft 271 is coaxially inserted into the second end of the drive shaft 22, and the positioning shaft 271 and the drive shaft 22 are clearance-fitted.

[0098] The drive shaft 22 can be a hollow structure, or the second end of the drive shaft 22 can be recessed inward. By setting a positioning shaft 271, which is inserted into the second end of the drive shaft 22, support is provided for the drive shaft 22, making the rotation of the drive shaft 22 smoother.

[0099] The fixed bracket 27 also has an eccentric hole 27a through which the shaft of the motor 25 passes and is connected to the transmission gear 24.

[0100] A positioning shaft 271 and an eccentric hole 27a are provided on the fixed bracket 27. The positioning shaft 271 is used to position the drive shaft 22, and the eccentric hole 27a is used to position the motor 25. Since both the positioning shaft 271 and the eccentric hole 27a are located on the fixed bracket 27, the accuracy of the distance between the positioning shaft 271 and the eccentric hole 27a is relatively easy to ensure. This results in high assembly accuracy between the drive shaft 22 and the transmission gear 24, making the transmission between the transmission gear 24 and the internal gear 23 smoother and avoiding excessive clearance that causes tooth skipping or excessive clearance that causes noise.

[0101] like Figure 8 As shown, the end face of the motor 25 has an annular boss 251, which is arranged around the rotating shaft of the motor 25 and is coaxial with the rotating shaft of the motor 25. The annular boss 251 is located in the eccentric hole 27a, and the annular boss 251 and the eccentric hole 27a are in transition fit.

[0102] By using the annular boss 251 on the motor 25 to cooperate with the eccentric hole 27a, the coaxiality between the motor 25 shaft and the eccentric hole 27a can be improved, which in turn improves the positional accuracy of the transmission gear 24, thereby making the cooperation accuracy between the transmission gear 24 and the internal gear 23 higher.

[0103] In some other possible implementations, a mounting shaft may also be provided in the eccentric hole 27a, with a clearance fit between the mounting shaft and the eccentric hole 27a, and both ends of the mounting shaft located outside the eccentric hole 27a. A transmission gear 24 is coaxially and fixedly connected to one end of the mounting shaft, and the other end of the mounting shaft is connected to the motor 25 for transmission. For example, the mounting shaft can be connected to the motor 25 via gear transmission or via belt transmission.

[0104] like Figure 8 As shown, the fixed bracket 27 has a first limiting rib 272 on the side near the drive shaft 22, and the internal gear 23 is located between the drive shaft 22 and the first limiting rib 272.

[0105] The first limiting rib 272 can block the gap between the internal gear 23 and the fixed bracket 27, preventing dust and other debris from entering the gap between the internal gear 23 and the fixed bracket 27. Lubricant can also be provided between the transmission gear 24 and the internal gear 23, and the first limiting rib 272 can block the lubricant to prevent it from overflowing.

[0106] In some examples, the gap width between the first limiting rib 272 and the internal gear 23 is 0.2 to 0.8 times the tooth height of the internal gear 23.

[0107] If the gap between the first limiting rib 272 and the internal gear 23 is too large, it will reduce the effectiveness of the first limiting rib 272 in preventing dust and other debris from entering the gap between the internal gear 23 and the fixed bracket 27, and will also reduce its blocking effect on lubricant. If the gap between the first limiting rib 272 and the internal gear 23 is too small, some debris can easily get stuck in the gap, thus affecting the rotation of the internal gear 23 or generating noise. Setting the gap width to 0.2 to 0.8 times the tooth height of the internal gear 23 provides better dust blocking effect for the first limiting rib 272, and also better prevents the outflow of lubricant, while also making it less likely for debris to get stuck between the first limiting rib 272 and the internal gear 23.

[0108] As an example, the first limiting rib 272 may be arc-shaped, and the first limiting rib 272 may be located at the edge of the fixed bracket 27 and extend along the edge of the fixed bracket 27.

[0109] like Figure 8 As shown, the fixed bracket 27 has a second limiting rib 273 on the side near the motor 25, and the second limiting rib 273 is distributed around the motor 25.

[0110] The second limiting rib 273 surrounds the motor 25 and can provide a limit for the motor 25. In addition, the second limiting rib 273 also covers the gap between the motor 25 and the fixed bracket 27, preventing foreign objects from getting stuck in the gap between the motor 25 and the fixed bracket 27 and affecting the assembly accuracy of the motor 25 on the fixed bracket 27.

[0111] like Figure 8 As shown, the fixed bracket 27 has a first notch 27b, which is offset from the internal gear 23 in the circumferential direction.

[0112] The cable 32 of the fan head 30 passes through the third opening 26a of the bushing 26 and can extend along the annular cavity 21a into the base 10. The first notch 27b is used to avoid the cable 32 of the fan head 30 within the annular cavity 21a. The first notch 27b is offset from the internal gear 23 in the circumferential direction to avoid the internal gear 23 rubbing against the cable 32.

[0113] In some examples, the first notch 27b and the second opening 22c at least partially overlap in the circumferential direction. This prevents the first notch 27b and the second opening 22c from misaligning during the rotation of the drive shaft 22, which would otherwise cause significant bending of the cable 32.

[0114] Figure 9 This is a schematic diagram illustrating the assembly of a motor and a fixed bracket according to an embodiment of this application. As an example, such as... Figure 9 As shown, the second limiting rib 273 has a second notch 273a, and the side wall of the second notch 273a has a slot 273b. An ear plate 252 is connected to the outer side wall of the motor 25, the ear plate 252 is located in the second notch 273a, and the ear plate 252 is at least partially located in the slot 273b.

[0115] During the assembly of the motor 25 and the fixed bracket 27, the motor 25 can be placed within the area enclosed by the second limiting rib 273, so that the ear plate 252 is placed in the second notch 273a. Then, by rotating the motor 25, the ear plate 252 is partially engaged into the slot 273b, and the annular boss 251 is aligned with the eccentric hole 27a. The cooperation between the slot 273b and the ear plate 252 allows the motor 25 and the fixed bracket 27 to be assembled into a whole, further facilitating the assembly of the oscillation mechanism and the fan.

[0116] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A swaying mechanism, characterized in that, include: Fixture (21); A drive shaft (22) is located in the fixed base (21) and rotates with the fixed base (21). An annular cavity (21a) is formed between the drive shaft (22) and the fixed base (21). The drive shaft (22) has a cavity (22a) inside. The first end of the drive shaft (22) has a first opening (22b) communicating with the cavity (22a). The side wall of the drive shaft (22) has a second opening (22c). The second opening (22c) connects the cavity (22a) and the annular cavity (21a). An internal gear (23) is located in the annular cavity (21a), and is coaxially arranged and connected with the drive shaft (22). The internal gear (23) and the second opening (22c) are offset from each other in the circumferential direction. The transmission gear (24) is located inside the internal gear (23) and meshes with the internal gear (23); The motor (25) is located in the fixed base (21) and at the second end of the drive shaft (22) for driving the transmission gear (24) to rotate.

2. The oscillating mechanism according to claim 1, characterized in that, The drive shaft (22) includes a first shaft body (221) and a second shaft body (222), wherein the first shaft body (221) and the second shaft body (222) are coaxially arranged and connected. The first opening (22b) and the second opening (22c) are located on the first shaft (221), and the internal gear (23) is located outside the second shaft (222) and connected to the second shaft (222).

3. The oscillating mechanism according to claim 2, characterized in that, The first shaft (221) has a first circumferential positioning structure (2211) at one end near the second shaft (222), and the second shaft (222) has a second circumferential positioning structure (2221) at one end near the first shaft (221). The first circumferential positioning structure (2211) and the second circumferential positioning structure (2221) cooperate with each other.

4. The oscillating mechanism according to any one of claims 1 to 3, characterized in that, The internal gear (23) is fan-shaped.

5. The oscillating mechanism according to any one of claims 1 to 3, characterized in that, The internal gear (23) has a receiving groove (23a) on the side near the motor (25), the teeth of the internal gear (23) are located on the side wall of the receiving groove (23a), and the transmission gear (24) is located in the receiving groove (23a).

6. The oscillating mechanism according to any one of claims 1 to 3, characterized in that, It also includes a fixed bracket (27), which is located inside the fixed base (21) and between the second end of the drive shaft (22) and the motor (25). The fixed bracket (27) is connected to the fixed base (21), and the drive shaft (22) is rotatably engaged with the fixed bracket (27).

7. The oscillating mechanism according to claim 6, characterized in that, The fixed bracket (27) has a protruding positioning shaft (271) in the middle. The positioning shaft (271) is coaxially inserted into the second end of the drive shaft (22) and is clearance-fitted with the drive shaft (22). The fixed bracket (27) also has an eccentric hole (27a), through which the shaft of the motor (25) passes and is connected to the transmission gear (24).

8. The oscillating mechanism according to claim 6, characterized in that, The fixed bracket (27) has a first notch (27b) which is offset from the internal gear (23) in the circumferential direction.

9. The oscillating mechanism according to claim 8, characterized in that, The first notch (27b) and the second opening (22c) at least partially overlap in the circumferential direction.

10. The oscillating mechanism according to claim 6, characterized in that, The fixed bracket (27) has a first limiting rib (272) on the side near the drive shaft (22), and the internal gear (23) is located between the drive shaft (22) and the first limiting rib (272).

11. The oscillating mechanism according to claim 10, characterized in that, The gap width between the first limiting rib (272) and the internal gear (23) is 0.2 to 0.8 times the tooth height of the internal gear (23).

12. The oscillating mechanism according to any one of claims 1 to 3, characterized in that, It also includes a bushing (26), which is located in the fixed seat (21) and coaxially sleeved outside the drive shaft (22). The sidewall of the bushing (26) has a third opening (26a) that exposes the second opening (22c).

13. A fan, characterized in that, The device includes a base (10), a fan head (30), a circuit board (33), and an oscillating mechanism (20) as described in any one of claims 1 to 12. The fixed seat (21) of the oscillating mechanism (20) is connected to the base (10). The fan head (30) is connected to the first end of the drive shaft (22). The circuit board (33) is located on the side of the motor (25) away from the fan head (30). The cable (32) of the fan head (30) passes through the first opening (22b), the cavity (22a), the second opening (22c), and the annular cavity (21a) and is connected to the circuit board (33).

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