Shaft end fixing structure, bearing and fan

Abstract

The utility model relates to the field of bearings, in particular to a shaft end fixing structure, a bearing and a fan. The shaft end fixing structure comprises an attraction piece and an abutting piece. The suction part is perpendicular to the rotating shaft, coaxial with the rotating shaft and arranged close to the first end of the rotating shaft. Attractive force exists between the attraction piece and the first end of the rotating shaft. The abutting piece is coaxially arranged with the rotating shaft and abuts between the first end of the rotating shaft and the attraction piece, so that the first end of the rotating shaft is separated from the attraction piece to form a slit. The abutting piece has the degree of freedom of rotating along the middle axis of the rotating shaft, so that the rotating shaft rotates along the middle axis direction relative to the attraction piece. The attraction piece attracts the rotating shaft, and the abutting piece is rotationally connected between the rotating shaft and the attraction piece to form a slit, so that the overall friction force is reduced, and the service life of the attraction piece is prolonged. In addition, the overall size of the structure is small, the influence on the length of the rotating shaft in the axial direction is small, and therefore the structure is suitable for the ultra-thin fan.

Description

Technical Field

[0001] The utility model relates to the field of bearings, in particular to a shaft end fixing structure, a bearing and a fan. Background Art

[0002] In a fan, a rotating shaft is often used to drive a number of blades to rotate rapidly to form an airflow. In order to ensure the rotation ability of the rotating shaft, a bearing is often provided to support the rotating shaft.

[0003] At present, since the bearing has a weak ability to constrain the position of the rotating shaft in the axial direction, at least two sets of bearings are usually arranged along the axial direction to prevent the rotating shaft from shaking in the axial direction. However, this design makes the fan thicker and is difficult to be applied to ultra-thin fans. Utility Model Content

[0004] The utility model aims to provide a shaft end fixing structure, a bearing and a fan which have a small thickness and can constrain the axial position of a rotating shaft.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] A shaft end fixing structure, comprising:

[0007] an attraction member, which is perpendicular to the rotating shaft and coaxially arranged with the rotating shaft, the rotating shaft having a first end, and the attraction member is used to provide an attractive force toward the attraction member to the first end of the rotating shaft;

[0008] The resistance member is coaxially arranged with the rotating shaft and is rotatably connected between the first end of the rotating shaft and the attracting member, so that a slit is formed between the rotating shaft and the attracting member.

[0009] Optionally, the abutment member is a ball, and a ball groove is provided at the first end of the rotating shaft. The abutment member is partially embedded in the ball groove and partially protrudes out of the ball groove.

[0010] Optionally, one end of the bead groove away from the attracting member is configured to be conical.

[0011] Optionally, the shaft end fixing structure further includes a matching ring, which is disposed at the first end of the rotating shaft and around the bead groove, and the matching ring and the attracting member attract each other.

[0012] Optionally, the attraction member includes a magnetic ring and a thrust plate, wherein the magnetic ring surrounds the thrust plate and is coaxially arranged with the thrust plate.

[0013] Optionally, the magnetic ring and the thrust plate are connected to each other.

[0014] Optionally, the ball is made of ceramic or wear-resistant steel, and / or the thrust plate is made of ceramic or wear-resistant steel.

[0015] Optionally, the ratio of the diameter of the ball to the diameter of the first end of the rotating shaft is any value between 1 / 3 and 4 / 5.

[0016] In a second aspect, the present invention further provides a bearing, including an outer ring and the above-mentioned shaft end fixing structure, wherein the attracting member is fixedly connected to the outer ring, and the rotating shaft is rotatably connected to the outer ring.

[0017] In a third aspect, the present invention further provides a fan, including the above-mentioned bearing and rotating shaft, and further including a motor coil disposed around the bearing and a ring magnet disposed around the motor coil, wherein the rotating shaft is controllably rotated under the drive of the motor coil and the ring magnet.

[0018] According to the first aspect of the present invention, the attracting member perpendicular to the rotating shaft attracts the first end of the rotating shaft to approach the attracting member, and the abutting member is rotatably connected between the first end of the rotating shaft and the attracting member, so that the first end of the rotating shaft cannot abut against the attracting member under the action of the gravitational force applied by the attracting member, thereby enabling the rotating shaft to rotate axially without friction with the attracting member. And the abutting member is rotatably connected between the rotating shaft and the attracting member, reducing the overall friction, prolonging the service life of the attracting member, and the overall volume of the structure is small, having little influence on the axial length of the rotating shaft, so as to be applicable to products with thickness requirements.

[0019] Further, using a ball as the abutting member, the ball is partially embedded in the first end of the rotating shaft and abuts against the attracting member, so that the friction between the ball and the rotating shaft and the attracting member is small, facilitating the rotation of the rotating shaft and helping to reduce the loss of the attracting member. The ball is easy to obtain and not easily damaged, having high practicability.

[0020] Further, by constructing the end of the ball groove away from the attracting member into a conical shape, the pressure of the rotating shaft on the ball in the axial direction is dispersed, reducing the risk that the ball groove is deformed and difficult to roll.

[0021] Further, by providing a mating ring, only by constructing the mating ring into a material that attracts the attracting member, the material of the rotating shaft can be freely selected, improving the practicability of the solution.

[0022] Further, by providing a thrust washer that is positionally mated with the ball, the magnetic ring surrounding the thrust washer is prevented from being worn when the ball rotates, improving the service life of the attracting member.

[0023] Further, the thrust washer is fixedly connected to the magnetic ring, so that the attracting member has high integrity and improves the ability to constrain the axial position of the rotating shaft.

[0024] Further, selecting ceramic or wear-resistant steel as the materials of the ball and the thrust washer helps to improve the service life of the shaft end fixing structure.

[0025] Furthermore, if the ball is too small, it will be easy to wear, and if the ball is too large, the ball groove will occupy a larger part of the surface of the first end of the shaft, resulting in insufficient suction. By limiting the diameter ratio of the ball to the shaft, it helps to improve the stability of the shaft end fixing structure.

[0026] According to the second aspect of the utility model, the attraction member and the resistance member in the shaft end fixing structure can constrain the distance between the rotating shaft and the attraction member in the axial direction. By fixing the attraction member relative to the outer ring, it helps to limit the axial position of the rotating shaft, thereby realizing the constraint of the axial position of the rotating shaft through a single bearing, improving the stability of the axial position when the rotating shaft rotates, and being able to keep the overall thickness of the bearing small, thereby improving the practicality of the bearing.

[0027] According to the third aspect of the utility model, a bearing with a shaft end restraint function is applied to a fan, so that the fan as a whole can be thinned while maintaining the stability of the fan shaft, which has high practicality.

[0028] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a fan driving mechanism shown in the first embodiment of the utility model;

[0030] Figure 2 This is a structural explosion diagram of the rotating shaft and the shaft end fixing structure shown in the first embodiment of the present utility model.

[0031] Legend: 1-shaft, 11-first end, 12-second end, 13-ball groove, 14-matching ring, 2-attracting member, 21-magnetic ring, 22-thrust plate, 3-resisting member, 4-outer ring, 41-liquid tank, 51-motor coil, 52-ring magnet, 53-motor housing. DETAILED DESCRIPTION

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0036] Please refer to Figure 1 , the shaft end fixing structure protected by the present utility model application includes an attracting member 2 and a resisting member 3. The rotating shaft 1 has a first end 11. The attracting member 2 is perpendicular to the rotating shaft 1, is coaxial with the rotating shaft 1 and is arranged adjacent to the first end 11 of the rotating shaft 1. There is an attracting force between the attracting member 2 and the first end 11 of the rotating shaft 1. The resisting member 3 is coaxially arranged with the rotating shaft 1 and resists between the first end 11 of the rotating shaft 1 and the attracting member 2, so that the first end 11 of the rotating shaft 1 and the attracting member 2 are separated from each other to form a slit. The resisting member 3 has a degree of freedom of rotation along the central axis of the rotating shaft 1, which is convenient for the rotating shaft 1 to rotate along its central axis direction relative to the attracting member 2.

[0037] The attracting member 2 perpendicular to the rotating shaft 1 attracts the first end 11 of the rotating shaft 1 to approach the attracting member 2. The resisting member 3 resists between the attracting member 2 and the first end 11 of the rotating shaft 1, so that the first end 11 of the rotating shaft 1 cannot contact the attracting member 2 under the action of the attracting force applied by the attracting member 2. Thus, when the rotating shaft 1 rotates along its axial direction, there is no friction between the rotating shaft 1 and the attracting member 2. And the resisting member 3 is rotatably connected between the rotating shaft 1 and the attracting member 2, reducing the overall friction and prolonging the service life of the attracting member 2. In addition, the overall volume of the structure is small, and the influence on the axial length of the rotating shaft 1 is small, so it is applicable to products with thickness requirements.

[0038] In some embodiments, the abutting member 3 is a ball. A bead groove 13 is provided at the first end 11 of the rotating shaft 1. Part of the abutting member 3 is embedded in the bead groove 13, and part protrudes out of the bead groove 13. The ball abuts against the inner wall of the bead groove 13 and the attracting member 2 at the same time. When the rotating shaft 1 rotates, the ball is limited in the bead groove 13 and rotates relative to the attracting member 2, which helps to reduce the friction force. The bead groove 13 is relatively easy to obtain, which helps to reduce the cost and improve the practicability.

[0039] In some embodiments, the attracting member 2 includes a magnetic ring 21 and a thrust washer 22. The magnetic ring 21 surrounds the thrust washer 22 and is coaxially arranged with the thrust washer 22. The thrust washer 22 has high wear resistance, which prevents the attracting member 2 from being worn due to the rotation of the ball, and improves the service life of the attracting member 2.

[0040] In some embodiments, the ratio of the diameter of the ball to the diameter of the first end 11 of the rotating shaft 1 is any value in the range of 1 / 3 to 4 / 5, for example, it can be any value among 1 / 3, 1 / 2, 2 / 3, 3 / 4 and 4 / 5, which helps to improve the stability of the rotating shaft 1.

[0041] The bearing protected by the present utility model application includes an outer ring 4 and the above-mentioned shaft end fixing structure. Among them, the attracting member 2 of the shaft end fixing structure is fixedly connected to the outer ring 4, and the rotating shaft 1 is rotatably connected to the outer ring 4.

[0042] In some embodiments, the bearing is a hydrodynamic bearing, and the attracting member 2 of the shaft end fixing structure is fixedly connected to the bottom of the inner wall of the outer ring 4.

[0043] In some embodiments, the bearing is a rolling bearing, and further includes a rolling element group and an inner ring. The rotating shaft 1 is fixedly connected to the inner ring and passes through the inner ring. The attracting member 2 of the shaft end fixing structure is fixedly connected to the outer ring 4.

[0044] The fan protected by the present utility model application includes the above-mentioned bearing and the rotating shaft 1, and further includes a motor coil 51 arranged around the bearing and a ring magnet 52 arranged around the motor coil 51. The rotating shaft 1 is controllably rotated under the drive of the motor coil 51 and the ring magnet 52. Since the length of the rotating shaft 1 in the axial direction is less affected by the bearing, the bearing has less influence on the overall thickness of the fan, and is suitable for ultra-thin fans.

[0045] For details, please refer to the following embodiments.

[0046] Embodiment 1:

[0047] The fan shown in a preferred embodiment of the present application includes a housing, a driving mechanism and a fan blade. The driving mechanism and the fan blade are both accommodated in the housing, and several fan blades rotate under the drive of the driving mechanism to form an air flow. In this embodiment, the thickness of the driving mechanism is small, so that the overall thickness of the fan is small.

[0048] Please refer to Figure 1The driving mechanism of the fan includes a rotating shaft 1, a bearing and a power assembly. The rotating shaft 1 is supported by the bearing and rotates controllably under the action of the power assembly, thereby driving a plurality of fan blades connected to the rotating shaft 1 to rotate.

[0049] See also Figure 1 and Figure 2 The bearing in this embodiment is a liquid dynamic bearing. The overall structure of the rotating shaft 1 is cylindrical, and the side of the outer wall is formed with precise fine grooves. The bearing includes an outer ring 4 of the rotating shaft 1 with an overall structure of a groove, and the structure of the inner wall is matched with the first end 11 and the second end 12 opposite to the first end 11. The first end 11 of the rotating shaft 1 is embedded in the outer ring 4, and the second end 12 of the rotating shaft 1 protrudes from the outer ring 4. An annular liquid groove 41 is formed on the inner wall of the outer ring 4 for accommodating lubricating oil to form an oil film. The specific structural design here is the prior art in this field, so it will not be described in detail.

[0050] The bearing in this embodiment further includes a shaft end fixing structure. The shaft end fixing structure includes an attracting member 2 and a resisting member 3. The attracting member 2 is fixedly connected to the bottom of the inner wall of the outer ring 4 and is arranged perpendicular to the rotating shaft 1. The resisting member 3 resists between the rotating shaft 1 and the attracting member 2.

[0051] The attracting member 2 includes a magnetic ring 21 and a thrust plate 22. The magnetic ring 21 is a ring-shaped magnet, and the thrust plate 22 is a disc made of ceramic material. The thrust plate 22 is embedded in the hollow part of the magnetic ring 21, and contacts and tightly bonds with the magnetic ring 21 to form a disc-shaped attracting member 2 with high integrity.

[0052] The abutment member 3 is a ball made of ceramic material, and the diameter of the ball and the thrust plate 22 are equal, and the diameter of the ball is 1 / 2 of the diameter of the shaft 1. In other embodiments, the diameter of the ball can also be slightly larger than the diameter of the thrust plate 22. A ball groove 13 that matches the ball structure is formed at the center of the first end 11 of the shaft 1. The main part of the ball groove 13 is constructed in a cylindrical shape coaxial with the shaft 1, and the cross-sectional area of ​​the end of the ball groove 13 away from the attraction member 2 gradually decreases, forming a conical compression portion.

[0053] In this embodiment, the shaft end fixing structure further includes a mating ring 14. The mating ring 14 is a circular iron ring, the inner diameter of which is equal to the diameter of the main part of the bead groove 13, and the outer diameter of which is equal to the diameter of the first end 11 of the rotating shaft 1. The mating ring 14 is coaxially and fixedly connected to the first end 11 of the rotating shaft 1 and is attracted by the magnetic ring 21, driving the rotating shaft 1 to move towards the attracting member 2. Since there is a magnetic attraction force between the mating ring 14 and the attracting member 2 and the mating ring 14 is fixedly connected to the rotating shaft 1, the rotating shaft 1 made of any material structure can be attracted by the attracting member 2. Part of the ball is accommodated in the bead groove 13 and part of it protrudes outside the mating ring 14, so that the mating ring 14 and the attracting member 2 cannot come into contact, forming a slit. Since there is a gap between the outer wall of the rotating shaft 1 and the inner wall of the outer ring 4, the slit is in communication with the liquid groove 41. When lubricating oil is injected into the liquid groove 41 and the gas is discharged, the slit is also filled with lubricating oil and there is no gas. In other embodiments, the slit can also be communicated with a separate oil injection port and an exhaust port, thereby improving the efficiency of oil injection and exhaust.

[0054] When the rotating shaft 1 is in a static state, the mating ring 14 connected to the first end 11 of the rotating shaft 1 is attracted by the attracting member 2, and the ball abuts between the thrust piece 22 and the bead groove 13, keeping the axial position of the rotating shaft 1 stable. Since the ball abuts against the pressing part of the bead groove 13 and the inner wall of the pressing part is inclined, it helps to disperse the pressure exerted by the rotating shaft 1 on the ball, prevent the ball from deforming, and improve the service life of the ball. Only by using the shaft end fixing structure to restrict the axial position of the rotating shaft 1, the length requirement for the rotating shaft 1 is small, which helps to reduce the overall thickness of the driving mechanism.

[0055] When the rotating shaft 1 rotates, under the lubrication of the lubricating oil in the slit, the ball rotates relative to the rotating shaft 1 and / or the thrust piece 22. Since both the ball and the thrust piece 22 are made of ceramic material and have high wear resistance, they have a long service life. The rotating shaft 1 remains stable during rotation. When a fault or an accident causes the rotating shaft 1 to be in an eccentric state, the ball constrained in the bead groove 13 of the rotating shaft 1 rolls on the thrust piece 22 along with the rotating shaft 1, without generating excessive friction, and has high fault tolerance. By restricting the diameters of the ball, the rotating shaft 1, the thrust piece 22 and the magnetic ring 21, it is possible to prevent the ball from rubbing against the magnetic ring 21 when the rotating shaft 1 is in an eccentric state, which helps to improve the fault tolerance.

[0056] When the rotating shaft 1 and the outer ring 4 are flipped synchronously, since there is an attraction force between the mating ring 14 fixedly connected to the rotating shaft 1 and the attracting member 2 fixedly connected to the outer ring 4, it is possible to prevent the rotating shaft 1 from coming out of the outer ring 4. Since the slit is filled with lubricating oil, it is also possible to prevent the rotating shaft 1 from coming out of the outer ring 4 through the action of air pressure.

[0057] Please refer to Figure 1, in this embodiment, the power assembly of the fan includes a motor coil 51, a ring magnet 52, and a motor housing 53. The motor coil 51 is arranged around the bearing, and the ring magnet 52 is arranged around the motor coil 51. The motor coil 51 is fixedly arranged. When a magnetic field is generated after it is powered on, the ring magnet 52 rotates controllably under the action of the magnetic field generated by the motor coil 51. Both the ring magnet 52 and the second end 52 of the rotating shaft 1 are fixedly connected to the motor housing 53. The rotating shaft 1 rotates controllably under the drive of the ring magnet 52, thereby reducing the friction between the ring magnet 52 and the outer ring 4 to which it is fixedly connected, ensuring the rotational accuracy, and reducing energy consumption. In this embodiment, the second end 52 of the rotating shaft 1 is flush with the outer wall of the motor housing 53, and the fan blade is fixedly connected to the motor housing 53 and arranged on the outer side of the ring magnet 52, forming a spatial layout where the fan blade coaxially surrounds the power assembly, thereby further reducing the overall thickness of the fan.

[0058] The beneficial effect of the present utility model is that only one bearing is used to restrict the axial position of the rotating shaft 1, which has high stability and helps to reduce the thickness of the driving mechanism, thereby helping to achieve the thinning of the fan.

[0059] Embodiment Two:

[0060] The difference between this embodiment and Embodiment One is only that it further includes a groove sleeve. The inner wall structure of the groove sleeve cooperates with the ball, and the inner wall of the ball groove 13 cooperates with the outer wall of the groove sleeve. The groove sleeve is embedded in the ball groove 13 and fixedly connected to the ball groove 13, and part of the ball is embedded in the groove sleeve. The groove sleeve is preferably made of ceramic material or wear-resistant steel material, which helps to improve the wear resistance of the rotating shaft 1 and thus improve the service life.

[0061] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0062] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. An axial end fixing structure, characterized in that, include: an attracting member (2) which is perpendicular to the rotating shaft (1) and is arranged coaxially with the rotating shaft (1), the rotating shaft (1) having a first end (11), and the attracting member (2) is used to provide an attractive force toward the attracting member (2) to the first end (11) of the rotating shaft (1); The resistance member (3) is coaxially arranged with the rotating shaft (1) and is rotatably connected between the first end (11) of the rotating shaft (1) and the attracting member (2), so that a slit is formed between the rotating shaft (1) and the attracting member (2).

2. The shaft end fixing structure according to claim 1, wherein, The abutment member (3) is a ball bearing, the first end (11) of the rotating shaft (1) is provided with a ball groove (13), and the abutment member (3) is partially embedded in the ball groove (13) and partially protrudes out of the ball groove (13).

3. The shaft end fixing structure according to claim 2, characterized in that, The end of the bead groove (13) away from the attracting member (2) is configured to be conical.

4. The shaft end fixing structure according to claim 2, characterized in that, It also comprises a matching ring (14), which is arranged at the first end (11) of the rotating shaft (1) and is arranged around the bead groove (13), and the matching ring (14) and the attracting member (2) attract each other.

5. The shaft end fixing structure according to claim 2, wherein, The attracting member (2) comprises a magnetic ring (21) and a thrust plate (22); the magnetic ring (21) surrounds the thrust plate (22) and is coaxially arranged with the thrust plate (22).

6. The shaft end fixing structure according to claim 5, characterized in that, The magnetic ring (21) and the thrust plate (22) are connected to each other.

7. The shaft end fixing structure according to claim 6, characterized in that, The ball is made of ceramic or wear-resistant steel, and / or the thrust plate (22) is made of ceramic or wear-resistant steel.

8. The shaft end fixing structure according to claim 2, wherein, The ratio of the diameter of the ball to the diameter of the first end (11) of the shaft (1) is any value between 1 / 3 and 4 / 5.

9. A bearing, characterized in that, It comprises an outer ring (4) and a shaft end fixing structure as claimed in any one of claims 1 to 8, wherein the attraction member (2) is fixedly connected to the outer ring (4), and the rotating shaft (1) is rotatably connected to the outer ring (4).

10. A fan, characterized in that, It comprises the bearing and rotating shaft (1) as claimed in claim 9, and also comprises a motor coil (51) arranged around the bearing and an annular magnet (52) arranged around the motor coil (51), and the rotating shaft (1) is controllably rotated under the drive of the motor coil (51) and the annular magnet (52).

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