Plastic bearing mounting structure, rotor assembly and electronic water pump using same

Abstract

The utility model discloses a plastic bearing mounting structure, a rotor assembly and an electronic water pump using the same, and relates to the technical field of electronic water pumps and parts thereof. The installation lining is made of rigid metal materials and is suitable for being coaxially fixed to the rotating shaft of the rotating body. At least one end of the mounting bush is provided with a bearing mounting hole; and the plastic bearing is embedded in the bearing mounting hole of the mounting bush and is at least coaxially fixed with the mounting bush. The plastic bearing mainly solves the problem of how to apply the plastic bearing to rotor assemblies of more material types in a matched mode. According to the plastic bearing disclosed by the utility model, through the mounting bush made of rigid metal materials, a mounting structure which is rigid, not easy to deform, compact in structure, good in coaxiality and simple to assemble is provided for the plastic bearing, and indirect matching between the plastic bearing and a rotating body is realized, so that the plastic bearing can be adaptively applied to rotating bodies of more material types; and the cost advantage of the product is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic water pump and its spare part technical field, concretely is a plastic bearing mounting structure, rotor assembly and the electronic water pump of application thereof. BACKGROUND

[0002] Electronic water pump has higher output efficiency and can realize accurate flow control, therefore, electronic water pump is widely used in car, household appliance and industrial equipment, for example, new energy automobile usually is equipped with two even more electronic water pump, to as the power source of whole cooling system.

[0003] Rotor assembly is one of the core spare parts of electronic water pump, it can rotate under the drive of the rotating magnetic field generated by the stator assembly of electronic water pump, and drive the impeller of electronic water pump to rotate to drive liquid medium to flow.

[0004] The rotor assembly of prior art electronic water pump needs to be supported on the shaft core through the bearing, so as to rotate, graphite bearing, ceramic bearing and self-lubricating bushing are commonly used.

[0005] With the development of composite engineering plastics, plastic bearings are gradually used in rotor assemblies of electronic water pumps due to their low cost, light weight, long service life and good consistency.

[0006] In the practical application of plastic bearings, the plastic bearings need to be injection molded in advance and then pressed into the mounting hole with a predetermined hole diameter, however, the plastic bearings must be interference fitted with the mounting hole to ensure the installation firmness and obtain accurate working hole diameter, therefore, the plastic bearings usually need to be matched with metal workpieces with high enough strength, which leads to the fact that some plastic substrate rotor assemblies cannot use plastic bearings and still need to use graphite bearings, ceramic bearings and self-lubricating bushings, which is not conducive to improving the cost advantage of electronic water pumps.

[0007] In summary, how to adapt plastic bearings to more material types of rotor assemblies is one of the problems to be solved. INVENTION CONTENTS

[0008] The utility model aims at providing a plastic bearing mounting structure, rotor assembly and electronic water pump applying the same, which can adapt plastic bearings to more material types of rotors.

[0009] In order to achieve the above object, the utility model provides the following technical scheme: a plastic bearing mounting structure, it includes plastic bearing and mounting bushing, the mounting bushing is rigid metal material, and it is suitable for being fixed coaxially at the rotating shaft of rotating body, at least one end of the mounting bushing is equipped with bearing mounting hole, the plastic bearing is embedded in the bearing mounting hole of the mounting bushing, and is fixed coaxially with the mounting bushing at least.

[0010] In the above technical scheme, the plastic bearing is embedded into the bearing mounting hole of the mounting bushing in the way of press fitting, and is interference fit with the bearing mounting hole of the mounting bushing.

[0011] In the above technical scheme, the inner ring of the bearing mounting hole of the mounting bushing is equipped with chamfer structure / round corner structure.

[0012] In the above technical scheme, the outer ring of the bearing mounting hole of the mounting bushing is also equipped with chamfer structure / round corner structure.

[0013] In the above technical scheme, the outer surface of the mounting bushing is equipped with rotation stop structure.

[0014] In the above technical scheme, the plastic bearing is sequentially equipped with sliding part and flange part along its axial direction, the sliding part of the plastic bearing is embedded in the bearing mounting hole of the mounting bushing, and the flange part of the plastic bearing abuts against the end face of the mounting bushing.

[0015] In the above technical scheme, the inner wall of the bearing mounting hole of the mounting bushing is equipped with stop step structure to limit the embedding depth of the plastic bearing.

[0016] A rotor assembly comprising the plastic bearing mounting structure described above, further comprising rotor support, magnetic ring and impeller cover, the rotor support is sequentially equipped with magnetic ring embedding part and blade platform part along its axial direction, wherein a plurality of blades are arranged on the blade platform part, the magnetic ring is coaxially connected to the magnetic ring embedding part of the rotor support, the impeller cover is fixed on the blades of the rotor support, and the mounting bushing is coaxially embedded in the rotating shaft of the rotor support.

[0017] In the above technical scheme, the rotor support and / or the mounting bushing are equipped with air avoidance groove, and the air avoidance groove is located at the matching position of the rotor support and the mounting bushing.

[0018] An electronic water pump comprising the rotor assembly described above.

[0019] Compared with the prior art, the plastic bearing mounting structure, the rotor assembly and the electronic water pump applying the same have the advantages that the mounting bushing is adapted to be fixed coaxially at the rotating shaft of the rotating body (for example, the rotor assembly of the electronic water pump), and the plastic bearing is embedded in the bearing mounting hole of the mounting bushing; in this way, the rigid metal material mounting bushing provides the plastic bearing with a rigid, non-deformable, compact, coaxial and simple mounting structure, realizes the indirect cooperation between the plastic bearing and the rotating body, and thus the plastic bearing can be applied to more types of rotating bodies, and the cost advantage of the product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the plastic bearing mounting structure in the utility model.

[0021] Figure 2 It is an exploded view of the plastic bearing mounting structure in the utility model.

[0022] Figure 3 It is a cross-sectional view of the plastic bearing mounting structure in the utility model.

[0023] Figure 4 It is a partial enlarged view of A in the utility model. Figure 3

[0024] Figure 5 It is a cross-sectional view of the plastic bearing mounting structure in the utility model.

[0025] Figure 6 It is a perspective view of the rotor assembly in the utility model.

[0026] Figure 7 It is an exploded view of the rotor assembly in the utility model.

[0027] Figure 8 It is a cross-sectional view of the rotor assembly in the utility model.

[0028] Figure 9 It is a partial enlarged view of B in the utility model. Figure 8

[0029] Reference signs are:

[0030] 10, plastic bearing; 101, sliding part; 102, flange part;

[0031] 20, mounting bushing; 201, bearing mounting hole; 202, chamfer / circle corner structure; 203, rotation stop structure; 204, stop step structure;

[0032] ​​30, rotor support; 301, magnetic ring embedding part; 302, blade platform part; 303, blade; 304, clearance groove;

[0033] 40, magnetic ring; 50, impeller cover. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] The embodiment provides a plastic bearing mounting structure which can adapt the plastic bearing 10 to be applied to more material types of rotors.

[0036] In the embodiment, the rotor assembly of an electronic water pump is taken as a typical rotor case to specifically illustrate the technical solutions of the present application; in other embodiments, the rotor can also be a fan blade, an impeller of an axial flow fan, a hub of a small wheel type device, etc.

[0037] Please refer to Figures 1-4 The plastic bearing mounting structure of the embodiment comprises a plastic bearing 10 and a mounting bushing 20.

[0038] The mounting bushing 20 is made of rigid metal material (for example, stainless steel or aluminum alloy) and is adapted to be fixed coaxially at the rotating shaft of the rotor, and the outer contour thereof is generally cylindrical.

[0039] The plastic bearing 10 is a composite engineering plastic material member integrally injection molded, and the outer contour thereof is generally cylindrical or annular.

[0040] At least one end of the mounting bushing 20 is provided with a bearing mounting hole 201, and in the embodiment, both ends of the mounting bushing 20 are provided with the bearing mounting hole 201.

[0041] The plastic bearing 10 is embedded in the bearing mounting hole 201 of the mounting bushing 20 and is at least coaxially fixed with the mounting bushing 20, that is, the plastic bearing 10 will rotate together with the mounting bushing 20.

[0042] Specifically, the plastic bearing 10 is embedded into the bearing mounting hole 201 of the mounting bushing 20 in a press-fitting manner and is interference-fitted with the bearing mounting hole 201 of the mounting bushing 20; in some possible embodiments, the plastic bearing 10 can also be key-fitted with the bearing mounting hole 201 of the mounting bushing 20 to further avoid relative rotation between the plastic bearing 10 and the mounting bushing 20.

[0043] Further, a chamfer structure / round corner structure 202 is arranged at the inner ring of the bearing mounting hole 201 of the mounting bush 20; in this embodiment, a chamfer structure is arranged at the inner ring of the bearing mounting hole 201 of the mounting bush 20, which can play a guiding role when the plastic bearing 10 is pressed in, and realize the clearance between the mounting bush 20 and the plastic bearing 10, so as to avoid cracking of the end of the mounting bush 20.

[0044] Further, a chamfer structure / round corner structure 202 is arranged at the outer ring of the bearing mounting hole 201 of the mounting bush 20; in this embodiment, a chamfer structure is arranged at the outer ring of the bearing mounting hole 201 of the mounting bush 20, which can play a guiding role when the mounting bush 20 is placed into the injection mold.

[0045] Further, a rotation stop structure 203 is arranged on the outer surface of the mounting bush 20, so as to avoid relative rotation between the mounting bush 20 and the rotating body; in this embodiment, the rotation stop structure 203 is knurling arranged on the outer surface of the mounting bush 20; in other embodiments, the rotation stop structure 203 can also be a key structure or a special-shaped structure arranged on the outer surface of the mounting bush 20.

[0046] Please refer to Figures 1-4 In some possible embodiments, the plastic bearing 10 is sequentially arranged with a sliding part 101 and a flange part 102 along the axial direction of the plastic bearing 10; specifically, the sliding part 101 and the flange part 102 are integrally injection molded, and the two constitute the plastic bearing 10, wherein the flange part 102 protrudes in the radial direction from the sliding part 101; the sliding part 101 of the plastic bearing 10 is embedded in the bearing mounting hole 201 of the mounting bush 20 (and is in interference fit with the bearing mounting hole 201 of the mounting bush 20), and the flange part 102 of the plastic bearing 10 abuts against the end face of the mounting bush 20, which can limit the embedding depth of the plastic bearing 10, and also can use the flange part 102 of the plastic bearing 10 as a thrust structure relative to the other face of the mounting bush 20 as a rotating body.

[0047] Please refer to Figure 5 In other possible embodiments, a stop step structure 204 is arranged at the inner wall of the bearing mounting hole 201 of the mounting bush 20 (which can be obtained by machining or integrally pressure casting), so as to limit the embedding depth of the plastic bearing 10.

[0048] This embodiment also provides a rotor assembly which is applied in an electronic water pump and can rotate under the driving of the rotating magnetic field generated by the stator assembly of the electronic water pump, so as to drive the impeller of the electronic water pump to rotate and drive the liquid medium to flow.

[0049] Please refer toFigures 6-9 The rotor assembly of the embodiment comprises the plastic bearing mounting structure described above.

[0050] The rotor assembly of the embodiment further comprises a rotor support 30, a magnetic ring 40, and an impeller cover 50; wherein the rotor support is a cylindrical support body made of engineering plastic, which is used as the structural support base of the rotor assembly of the embodiment; the magnetic ring 40 is an annular permanent magnet, which has permanent magnetism; and the impeller cover 50 is a circular cover body made of engineering plastic, which is suitable for being ultrasonically welded.

[0051] The rotor support 30 is sequentially provided with a magnetic ring embedding portion 301 and a blade platform portion 302 along its axial direction; the magnetic ring embedding portion 301 is an annular recess structure feature at the rotor support 30, and the blade platform portion 302 is a platform structure feature at the rotor support 30; wherein a plurality of blades 303 are arranged on the blade platform portion 302; specifically, the blades 303 are integrally injection molded at the rotor support 30 as a structure feature; each blade 303 is arc-shaped and uniformly distributed with the rotation axis of the rotor support 30 as the center; the magnetic ring 40 is coaxially sleeved at the magnetic ring embedding portion 301 of the rotor support 30 and fixed coaxially with the rotor support 30; the impeller cover 50 is fixed on the blades 303 of the rotor support 30; in the embodiment, the inner side of the impeller cover 50 is provided with an ultrasonic wire, and the top surface of the blades 303 of the rotor support 30 is also provided with an ultrasonic wire; the impeller cover 50 and the blades 303 of the rotor support 30 are welded and fixed as a whole by ultrasonic welding; and the plastic bearing 10 mounted at the mounting bushing 20 can be coaxially fixed at the rotation axis of the rotor support 30 through the mounting bushing 20.

[0052] In the manufacturing of the rotor assembly of the embodiment, the preformed mounting bushing 20 and the magnetic ring 40 are first placed into an injection mold of the rotor support 30 (the outer ring of the bearing mounting hole 201 of the mounting bushing 20 is provided with a chamfer structure, which can play a guiding role when the mounting bushing 20 is placed into the injection mold); plastic material is injected into the injection mold; after the plastic material cools and solidifies, the integrated structure combination of the mounting bushing 20, the rotor support 30, and the magnetic ring 40 can be obtained by demolding (since the outer surface of the mounting bushing 20 is provided with a rotation stop structure 203, the molten plastic material also flows into the rotation stop structure 203, so that the mounting bushing 20 and the rotor support 30 are not easy to rotate relative to each other after demolding); then, the impeller cover 50 and the blades 303 of the rotor support 30 are welded and fixed as a whole by ultrasonic welding; finally, the plastic bearing 10 is press-fitted into the bearing mounting hole 201 of the mounting bushing 20, and the manufacturing of the rotor assembly is completed.

[0053] Further, the rotor support 30 and / or the mounting bushing 20 is configured with a clearance groove 304 at the matching position of the rotor support 30 and the mounting bushing 20; in the embodiment, the clearance groove 304 is a small groove-like structure feature configured at the inner wall of the rotor support 30, for avoiding overflow, batch peak and other problems in the injection molding process of the rotor support 30.

[0054] The embodiment also provides an electronic water pump, which comprises the rotor assembly.

[0055] The plastic bearing mounting structure, the rotor assembly and the electronic water pump of the embodiment, the mounting bushing 20 is adapted to be fixed coaxially at the rotating shaft of the rotating body (for example, the rotor assembly of the electronic water pump), and the plastic bearing 10 is embedded in the bearing mounting hole 201 of the mounting bushing 20; in this way, the rigid metal material mounting bushing 20 provides the plastic bearing 10 with a rigid, non-deformable, compact structure, good coaxiality and simple assembly mounting structure, realizes the indirect matching of the plastic bearing 10 and the rotating body, and thus the plastic bearing 10 can be applied to more types of rotating bodies, which is beneficial to improve the cost advantage of the product.

[0056] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A plastic bearing mounting structure, characterized by, The plastic bearing and the mounting bushing are included; The mounting bushing is made of rigid metal material and is adapted to be coaxially fixed at the rotating shaft of the rotating body; At least one end of the mounting bushing is provided with a bearing mounting hole; The plastic bearing is embedded in the bearing mounting hole of the mounting bushing and is coaxially fixed with the mounting bushing.

2. The plastic bearing mounting structure of claim 1, wherein The plastic bearing is embedded in the bearing mounting hole of the mounting bushing in a press-fit manner and is in interference fit with the bearing mounting hole of the mounting bushing.

3. The plastic bearing mounting structure according to claim 1 or 2, characterized in that, The inner ring of the bearing mounting hole of the mounting bushing is provided with a chamfer structure / round corner structure.

4. The plastic bearing mounting structure according to claim 1 or 2, wherein The outer ring of the bearing mounting hole of the mounting bushing is also provided with a chamfer structure / round corner structure.

5. The plastic bearing mounting structure according to claim 1 or 2, wherein The outer surface of the mounting bushing is provided with a rotation stop structure.

6. The plastic bearing mounting structure according to claim 1 or 2, wherein The plastic bearing is sequentially provided with a sliding part and a flange part along the axial direction thereof; The sliding part of the plastic bearing is embedded in the bearing mounting hole of the mounting bushing, and the flange part of the plastic bearing abuts against the end face of the mounting bushing.

7. The plastic bearing mounting structure according to claim 1 or 2, wherein The inner wall of the bearing mounting hole of the mounting bushing is provided with a stop step structure to limit the embedding depth of the plastic bearing.

8. A rotor assembly characterized by, The plastic bearing mounting structure of any one of claims 1-7 is included; A rotor support, a magnetic ring and an impeller cover are further included; The rotor support is sequentially provided with a magnetic ring embedding part and a blade platform part along the axial direction thereof, wherein a plurality of blades are arranged on the blade platform part; The magnetic ring is coaxially sleeved at the magnetic ring embedding part of the rotor support; The impeller cover is fixed on the blades of the rotor support; The mounting bushing is coaxially embedded at the rotating shaft of the rotor support.

9. The rotor assembly of claim 8, wherein, The rotor support and / or the mounting bushing is provided with a clearance groove; The clearance groove is located at the matching position of the rotor support and the mounting bushing.

10. An electronic water pump characterized by comprising: The rotor assembly of claim 8 or 9 is included.

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