A dustproof and waterproof structure for EPS brushless motors

Abstract

This utility model discloses a dustproof and waterproof structure for an EPS brushless motor, relating to the field of brushless motor technology. The utility model includes a housing and a sealing assembly. The housing includes a rotating shaft, and the sealing assembly includes: a support ring with a permanent magnet fixedly connected to its inner wall. Magnetic poles are fixedly connected to the top and bottom of the permanent magnet, and a magnetic fluid contacts the gap between the magnetic poles and the rotating shaft; and an oil seal fixedly connected to the top of the housing, with a groove on its top. An oil seal gasket is press-fitted into the inner wall of the groove. By setting up the sealing assembly, specifically, when the rotating shaft rotates, the permanent magnet generates a strong magnetic field within the support ring. The magnetic fluid is constrained by the magnetic field in the gap between the magnetic poles and the rotating shaft, forming a liquid sealing ring. The magnetic fluid ring rotates synchronously with the rotating shaft, dynamically filling the gap. Combined with the physical barrier formed by the upper oil seal gasket and the oil seal, a multi-level sealing structure is formed, solving the problem of limited dustproof and waterproof performance in existing EPS brushless motors.

Description

Technical Field

[0001] This utility model belongs to the field of brushless motor technology, and in particular relates to a dustproof and waterproof structure for EPS brushless motors. Background Technology

[0002] As the core actuator controlling steering assistance, the brushless motor in the electric power steering (EPS) system is directly related to vehicle driving safety. This type of motor is usually installed in the engine compartment or near the chassis and is exposed to a complex environment with dust, humidity and drastic temperature differences for a long time. However, the sealing structure of traditional EPS brushless motors usually only uses oil seals to form mechanical seals. During the high-speed rotation of the shaft, the clearance cannot be dynamically compensated, and the dustproof and waterproof effect is relatively limited. Utility Model Content

[0003] The purpose of this invention is to provide a dustproof and waterproof structure for EPS brushless motors. By setting a sealing component, specifically, when the shaft rotates, the permanent magnet generates a strong magnetic field in the support ring. The magnetic fluid is constrained by the magnetic field in the gap between the magnetic pole and the shaft, forming a liquid sealing ring. The magnetic fluid ring rotates synchronously with the shaft, dynamically filling the gap. Combined with the physical barrier formed by the upper oil seal gasket and the oil seal opening, a multi-level sealing structure is formed, which solves the problem that the dustproof and waterproof effect of existing EPS brushless motors is relatively limited.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] This utility model relates to a dustproof and waterproof structure for an EPS brushless motor, comprising a housing and a sealing assembly. The housing includes a rotating shaft, and a front end cover is fixedly connected to the top of the housing. The top of the rotating shaft passes through the front end cover and is rotatably connected to the interior of the front end cover. The sealing assembly is installed on the side of the front end cover near the rotating shaft and is used to seal the gap between the rotating shaft and the front end cover. The sealing assembly includes:

[0006] A support ring is fixedly connected to the bottom of the front end cover. A permanent magnet is fixedly connected to the inner wall of the support ring. Magnetic poles are fixedly connected to the top and bottom of the permanent magnet. Magnetorheological fluid is in contact with the gap between the magnetic poles and the rotating shaft.

[0007] An oil seal is fixedly connected to the top of the front cover. A groove is provided on the top of the oil seal, and an oil seal gasket is in interference contact with the inner wall of the groove.

[0008] Furthermore, the outer surface of the oil seal is provided with threads, and a dust cover is threadedly connected to the outer surface of the oil seal.

[0009] Furthermore, a stepped groove is fixedly connected to the bottom of the dust cover.

[0010] Furthermore, the housing also includes:

[0011] A rear end cover is installed at the bottom of the housing. A connecting ring is fixedly connected to the bottom of the outer surface of the housing. The bottom of the connecting ring is fixedly connected to the top of the rear end cover by bolts.

[0012] A circuit board, which is fixedly connected to the top of the rear end cover, is used to control the output of the rotating shaft;

[0013] A wire harness tube, which is fixedly connected to the bottom of a circuit board for power input, includes a wire harness.

[0014] Furthermore, a sealing ring is fixedly connected to the top of the rear end cover, and the top of the sealing ring is in interference contact with the bottom of the connecting ring.

[0015] Furthermore, a sealing cavity is provided on the top of the circuit board, and several connecting blocks are fixedly connected to the outer surface of the sealing cavity. The bottom of the connecting blocks is fixedly connected to the top of the circuit board by bolts. A second sealing ring is fixedly connected to the bottom of the sealing cavity, and the bottom of the second sealing ring is in interference contact with the top of the circuit board.

[0016] Furthermore, the gap between the outer surface of the wire harness tube and the interior of the rear end cover, and the gap between the outer surface of the wire harness and the interior of the wire harness tube, are both fixedly connected by adhesive injection.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model, by setting a sealing component, specifically, when the shaft rotates, the permanent magnet generates a strong magnetic field in the support ring, and the magnetic fluid is constrained by the magnetic field in the gap between the magnetic pole and the shaft to form a liquid sealing ring. The magnetic fluid ring rotates synchronously with the shaft, dynamically filling the gap. Together with the physical barrier formed by the upper oil seal gasket and the oil seal opening, a multi-level sealing structure is formed, which effectively improves the dustproof and waterproof performance of the motor.

[0019] 2. This utility model sets up a sealing cavity, specifically by using bolts to connect the sealing cavity to the circuit board. The bolts tighten the sealing ring, so that the sealing cavity and the sealing ring form a dry and airtight chamber, which isolates the circuit board from the humidity of the motor's internal environment and ensures the stability of the motor control system.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the sealing assembly structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the dust cover structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the rear end cover structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the sealing cavity 131 of this utility model;

[0027] Figure 6 This is a schematic diagram of the sealing ring 133 of this utility model.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Housing; 11. Front cover; 111. Shaft; 12. Rear cover; 121. Connecting ring; 122. Sealing ring one; 13. Circuit board; 131. Sealing cavity; 132. Connecting block; 133. Sealing ring two; 14. Wire harness tube; 141. Wire harness; 2. Sealing assembly; 21. Support ring; 211. Permanent magnet; 212. Magnetic pole; 213. Magnetorheological fluid; 22. Oil seal; 221. Oil seal gasket; 222. Dust cover; 223. Stepped groove. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-6 As shown, this utility model has the following three specific embodiments.

[0032] Example 1

[0033] This utility model relates to a dustproof and waterproof structure for an EPS brushless motor, comprising a housing 1 and a sealing assembly 2. The housing 1 includes a rotating shaft 111, and a front end cover 11 is fixedly connected to the top of the housing 1. The top of the rotating shaft 111 passes through the front end cover 11 and is rotatably connected to the interior of the front end cover 11. The sealing assembly 2 is installed on the side of the front end cover 11 near the rotating shaft 111 and is used to seal the gap between the rotating shaft 111 and the front end cover 11. The sealing assembly 2 includes:

[0034] Support ring 21 is fixedly connected to the bottom of front cover 11. A permanent magnet 211 is fixedly connected to the inner wall of support ring 21. Magnetic poles 212 are fixedly connected to the top and bottom of permanent magnet 211. Magnet fluid 213 is in contact with the gap between magnetic poles 212 and rotating shaft 111.

[0035] Oil seal 22 is fixedly connected to the top of the front cover 11. The top of the oil seal 22 has a groove, and the inner wall of the groove at the top of the oil seal 22 is in interference contact with an oil seal gasket 221.

[0036] like Figures 1-3 As shown, by setting the sealing component 2, specifically when the rotating shaft 111 rotates, the permanent magnet 211 generates a strong magnetic field in the support ring 21. The magnetic fluid 213 is constrained by the magnetic field in the gap between the magnetic pole 212 and the rotating shaft 111, forming a liquid sealing ring. The magnetic fluid 213 ring rotates synchronously with the rotating shaft 111, dynamically filling the gap. Together with the physical barrier formed by the upper oil seal gasket 221 and the oil seal 22, a multi-level sealing structure is formed, which effectively improves the dustproof and waterproof performance of the motor.

[0037] The oil seal 22 has threads on its outer surface, and a dust cover 222 is threadedly connected to the outer surface of the oil seal 22.

[0038] The bottom of the dust cover 222 is fixedly connected with a stepped groove 223.

[0039] The threaded dust cover 222 is easy to install, remove and maintain, while providing an additional physical protective layer for the oil seal area 22; the stepped groove 223 at the bottom of the dust cover 222 is designed to form a labyrinth structure, which increases the path length and resistance of liquid and dust intrusion, effectively improving the dustproof and waterproof effect.

[0040] Example 2

[0041] The difference from Embodiment 1 is that this embodiment discloses a sealing structure for the rear cover 12:

[0042] The housing 1 also includes:

[0043] A rear end cover 12 is installed at the bottom of the housing 1. A connecting ring 121 is fixedly connected to the bottom of the outer surface of the housing 1. The bottom of the connecting ring 121 is fixedly connected to the top of the rear end cover 12 by bolts.

[0044] Circuit board 13 is fixedly connected to the top of the rear end cover 12 and is used to control the output of the rotating shaft 111.

[0045] The wire harness tube 14 is fixedly connected to the bottom of the circuit board 13 for power input. The wire harness tube 14 includes a wire harness 141.

[0046] A sealing ring 122 is fixedly connected to the top of the rear cover 12, and the top of the sealing ring 122 is in interference contact with the bottom of the connecting ring 121.

[0047] like Figure 3 As shown, a sealing ring is provided on the mating surface of the connecting ring 121 of the housing 1 and the rear cover 12, and a tight seal is formed by interference contact, which effectively prevents external dust and liquid from entering the motor through the gap of the main mating surface of the housing, ensuring the sealing integrity of the motor main chamber.

[0048] Example 3

[0049] The difference from Embodiment 2 is that this embodiment discloses a sealing structure for the circuit board 13 and the wire harness tube 14:

[0050] A sealing cavity 131 is provided on the top of the circuit board 13. Several connecting blocks 132 are fixedly connected to the outer surface of the sealing cavity 131. The bottom of the connecting blocks 132 is fixedly connected to the top of the circuit board 13 by bolts. A second sealing ring 133 is fixedly connected to the bottom of the sealing cavity 131. The bottom of the second sealing ring 133 is in interference contact with the top of the circuit board 13.

[0051] like Figures 5-6 As shown, by setting a sealing cavity 131, specifically by using bolts to connect the sealing cavity 131 to the circuit board 13, and by pressing the bolts to tighten the sealing ring 133, the sealing cavity 131 and the sealing ring 133 form a dry airtight chamber, which isolates the circuit board 13 from the humidity of the motor's internal environment and ensures the stability of the motor control system.

[0052] The gap between the outer surface of the wire harness tube 14 and the inner part of the rear end cover 12, and the gap between the outer surface of the wire harness 141 and the inner part of the wire harness tube 14, are both fixedly connected by glue injection.

[0053] All minute gaps between the wire harness tube 14 and the rear end cover 12, as well as between the wire harness 141 and the wire harness tube 14, are filled and cured with adhesive to form a permanent sealing barrier without dead corners, thereby improving the sealing and protection effect.

[0054] A specific application of this embodiment is as follows: When the shaft 111 rotates, the permanent magnet 211 generates a strong magnetic field within the support ring 21. The magnetofluid 213 is constrained by the magnetic field in the gap between the magnetic pole 212 and the shaft 111, forming a liquid sealing ring. The magnetofluid 213 ring rotates synchronously with the shaft 111, dynamically filling the gap. Combined with the physical barrier formed by the upper oil seal gasket 221 and the oil seal opening 22, a multi-stage sealing structure is formed. The dust cover 222 is threaded onto the outer surface of the oil seal opening 22, facilitating maintenance of the oil seal gasket 221. The stepped groove 223 of the dust cover 222 forms a labyrinthine air passage, effectively preventing dust and liquid from entering. The end cap 12 is connected to the connecting ring 121 by bolts, which facilitates maintenance of the motor's internal parts. At the same time, the bolts tighten the sealing ring 122, so that the sealing ring 122 forms a radial compression seal between the connecting ring 121 and the rear end cap 12. The sealing cavity 131 is connected to the circuit board 13 by bolts, and the bolts tighten the sealing ring 133, so that the sealing cavity 131 and the sealing ring 133 form a dry airtight chamber, which isolates the circuit board 13 from the humidity of the motor's internal environment. All the tiny gaps between the wire harness tube 14 and the rear end cap 12, as well as between the wire harness 141 and the wire harness tube 14, are filled and cured with glue to form a permanent sealing barrier without dead corners.

[0055] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An EPS brushless motor dustproof and waterproof structure, comprising a shell (1) and a sealing assembly (2), the shell (1) comprises a rotating shaft (111), the top of the shell (1) is fixedly connected with a front end cover (11), the rotating shaft (111) penetrates through the front end cover (11) and is rotationally connected with the inside of the front end cover (11), characterized in that: The sealing assembly (2) is installed on the side of the front end cover (11) near the rotating shaft (111) for sealing the gap between the rotating shaft (111) and the front end cover (11). The sealing assembly (2) includes: ​ A support ring (21) is fixedly connected to the bottom of the front end cover (11). A permanent magnet (211) is fixedly connected to the inner wall of the support ring (21). A magnetic pole (212) is fixedly connected to the top and bottom of the permanent magnet (211). A magnetic fluid (213) is in contact with the gap between the magnetic pole (212) and the rotating shaft (111). Oil seal (22) is fixedly connected to the top of the front cover (11). The top of the oil seal (22) has a groove, and the inner wall of the groove at the top of the oil seal (22) is in interference contact with an oil seal gasket (221).

2. The dustproof and waterproof structure for an EPS brushless motor according to claim 1, characterized in that, The oil seal (22) has threads on its outer surface, and a dust cover (222) is threaded onto the outer surface of the oil seal (22).

3. The dustproof and waterproof structure for an EPS brushless motor according to claim 2, characterized in that, The bottom of the dust cover (222) is fixedly connected with a stepped groove (223).

4. The dustproof and waterproof structure for an EPS brushless motor according to claim 1, characterized in that, The housing (1) further includes: The rear end cover (12) is installed at the bottom of the housing (1). A connecting ring (121) is fixedly connected to the bottom of the outer surface of the housing (1). The bottom of the connecting ring (121) is fixedly connected to the top of the rear end cover (12) by bolts. Circuit board (13), which is fixedly connected to the top of the rear end cover (12) and is used to control the output of the rotating shaft (111); A wire harness tube (14) is fixedly connected to the bottom of a circuit board (13) for power input. The wire harness tube (14) includes a wire harness (141).

5. The dustproof and waterproof structure for an EPS brushless motor according to claim 4, characterized in that, A sealing ring (122) is fixedly connected to the top of the rear cover (12), and the top of the sealing ring (122) is in interference contact with the bottom of the connecting ring (121).

6. The dustproof and waterproof structure for an EPS brushless motor according to claim 4, characterized in that, The circuit board (13) has a sealing cavity (131) at the top. Several connecting blocks (132) are fixedly connected to the outer surface of the sealing cavity (131). The bottom of the connecting blocks (132) is fixedly connected to the top of the circuit board (13) by bolts. A second sealing ring (133) is fixedly connected to the bottom of the sealing cavity (131). The bottom of the second sealing ring (133) is in interference contact with the top of the circuit board (13).

7. The dustproof and waterproof structure for an EPS brushless motor according to claim 4, characterized in that, The outer surface of the wire harness tube (14) and the inner gap of the rear end cover (12) and the outer surface of the wire harness (141) and the inner gap of the wire harness tube (14) are fixedly connected by glue injection.

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