Shaft electric corrosion inhibition assembly and electric driving system

Abstract

The utility model discloses a shaft electric corrosion inhibition assembly and an electric driving system, and relates to the conductive structure technology field, the shaft electric corrosion inhibition assembly comprises a circuit board, a conductive member and an electronic device; the circuit board is annular; the conductive piece is connected with the circuit board; the electronic device is connected with the circuit board, and the conductive piece is electrically connected to the electronic device through the circuit board. According to the technical scheme provided by the utility model, the problems of complex installation and large occupied space caused by using two circuit boards are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of conductive structures, in particular to a shaft electrical corrosion suppression component and an electric drive system. Background Art

[0002] Currently, most automotive motors utilize PWM (Pulse Width Modulation) inverters with IGBTs (Insulated Gate Bipolar Transistors) as their power devices. Driven by a sinusoidal power supply and internal motor factors, shaft voltage and current are unavoidable. Excessive shaft current can cause electrical corrosion in bearings. When the bearing voltage between the inner and outer raceways rises to a certain level, exceeding the lubricant film threshold voltage, a breakdown discharge occurs. The resulting short-circuit current quickly generates significant heat, melting the metal near the breakdown point. This leads to increasingly poor bearing performance and shortens bearing life. Long-term shaft current can compromise motor reliability. Shaft corrosion suppression components (e.g., carbon brushes) are often used to provide a path for the shaft current to escape, addressing the issue of bearing corrosion.

[0003] In related technologies, the shaft current suppression scheme generally guides the shaft current of the rotating shaft to the circuit board through conductive parts (for example, conductive brushes, conductive carbon brushes, conductive springs, etc.), and then conducts the shaft current of the motor to the casing through the conductive path on the circuit board for discharge. In order to improve the shaft current suppression effect, electronic devices are usually added to the shaft current suppression circuit. However, the electronic devices are installed on independent circuit boards, so two circuit boards are required to install the conductive parts and the electronic devices respectively, which makes the installation between the two circuit boards complicated and occupies a large space. Utility Model Content

[0004] The main purpose of the utility model is to provide a shaft electric corrosion suppression component and an electric drive system, aiming to solve the problems of complex installation and large space occupation caused by using two circuit boards.

[0005] To achieve the above objectives, the present invention provides a shaft electrical corrosion suppression assembly, comprising:

[0006] A circuit board, wherein the circuit board is in a ring shape;

[0007] a conductive member connected to the circuit board;

[0008] An electronic device is connected to the circuit board, and the conductive member is electrically connected to the electronic device through the circuit board.

[0009] In one embodiment, the circuit board has a first surface and a second surface that are opposite to each other, the conductive member is provided on the first surface, and the electronic device is provided on the first surface or the second surface.

[0010] In one embodiment, a center hole is formed in the center of the circuit board, and the rotating shaft passes through the center hole and is loosely fitted with the center hole; the end of the conductive member extends toward the center point of the center hole and maintains contact with the rotating shaft.

[0011] In one embodiment, the conductive element includes:

[0012] A conductive bracket connected to the circuit board;

[0013] A conductive brush is connected to the conductive bracket, and an end of the conductive brush extends toward the center point of the central hole.

[0014] In one embodiment, a first limiting protrusion is provided at one end of the conductive bracket away from the conductive brush, a limiting hole is provided on the first surface, and the first limiting protrusion is inserted into the limiting hole;

[0015] And / or, a second limiting protrusion is provided at one end of the conductive bracket close to the conductive brush, a limiting groove is provided on the inner side of the circuit board, and the second limiting protrusion is snapped into the limiting groove.

[0016] In one embodiment, a plurality of the conductive members are provided, and the plurality of conductive members are distributed at intervals along the circumference of the circuit board.

[0017] In one embodiment, the conductive members are distributed on both sides of the circuit board, and the conductive members are symmetrically arranged along the central axis of the circuit board.

[0018] In one embodiment, the conductive member and / or the electronic component are soldered to the circuit board.

[0019] In one embodiment, the electronic device includes a capacitive device and a resistive device.

[0020] In one embodiment, the circuit board is provided with a mounting hole, and the fastener passes through the mounting hole to engage with the housing and ground the circuit board.

[0021] To achieve the above objectives, the present invention further provides an electric drive system, comprising:

[0022] chassis;

[0023] a rotating shaft, the rotating shaft being arranged in the housing;

[0024] As in the shaft electrical corrosion suppression assembly described above, the conductive member of the shaft electrical corrosion suppression assembly contacts the circumferential surface and / or end surface of the rotating shaft.

[0025] The technical solution of the utility model integrates the conductive parts and electronic devices on one circuit board, thereby eliminating the use of a circuit board and the space occupied, saving costs and reducing the space occupied, and at the same time eliminating the installation steps of two circuit boards, thereby solving the problem of complex installation and large space occupied when using two circuit boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a structural schematic diagram of an embodiment of a shaft electrical corrosion suppression assembly provided by the utility model;

[0028] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0029] Description of Figure Numbers:

[0030] Label name Label name 100 Shaft galvanic corrosion suppression kit a Central Axis 10 circuit board 20 Conductive parts 10a First surface 21 Conductive bracket 10b Second surface 211 The first limiting protrusion 11 Center hole 212 Second limiting protrusion 12 Limiting hole 22 Conductive brush 13 Limiting groove 30 Electronic devices 14 Mounting holes

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Currently, most automotive motors utilize PWM (Pulse Width Modulation) inverters with IGBTs (Insulated Gate Bipolar Transistors) as their power devices. Driven by a sinusoidal power supply and internal motor factors, shaft voltage and current are unavoidable. Excessive shaft current can cause electrical corrosion in bearings. When the bearing voltage between the inner and outer raceways rises to a certain level, exceeding the lubricant film threshold voltage, a breakdown discharge occurs. The resulting short-circuit current quickly generates significant heat, melting the metal near the breakdown point. This leads to increasingly poor bearing performance and shortens bearing life. Long-term shaft current can compromise motor reliability. Shaft corrosion suppression components (e.g., carbon brushes) are often used to provide a path for the shaft current to escape, addressing the issue of bearing corrosion.

[0036] In related technologies, the shaft current suppression scheme generally guides the shaft current of the rotating shaft to the circuit board through conductive parts (for example, conductive brushes, conductive carbon brushes, conductive springs, etc.), and then conducts the shaft current of the motor to the casing through the conductive path on the circuit board for discharge. In order to improve the shaft current suppression effect, electronic devices are usually added to the shaft current suppression circuit. However, the electronic devices are installed on independent circuit boards, so two circuit boards are required to install the conductive parts and the electronic devices respectively, which makes the installation between the two circuit boards complicated and occupies a large space.

[0037] Based on the above problems, the present invention proposes a shaft corrosion suppression assembly 100, which aims to solve the problem of complex installation and large space occupied when using two circuit boards 10. The shaft corrosion suppression assembly 100 is applied to an electric drive system, and the electric drive system may also include a housing and a rotating shaft. The rotating shaft and the shaft corrosion suppression assembly 100 are both installed in the housing. The conductive part 20 of the shaft corrosion suppression assembly 100 contacts the rotating shaft to guide the shaft current of the rotating shaft to the circuit board 10, and then conducts the shaft current of the rotating shaft to the electronic device 30 and the housing through the conductive path on the circuit board 10 to discharge it, so as to solve the problem of bearing corrosion. The structure of the shaft corrosion suppression assembly 100 will be described in the following as an example:

[0038] See also Figure 1 In one embodiment of the present invention, the shaft electrical corrosion suppression assembly 100 includes a circuit board 10, a conductive member 20 and an electronic device 30; the circuit board 10 is annular; the conductive member 20 is connected to the circuit board 10; the electronic device 30 is connected to the circuit board 10, and the conductive member 20 is electrically connected to the electronic device 30 through the circuit board 10.

[0039] The technical solution of the present invention integrates the conductive member 20 and the electronic device 30 on one circuit board 10, thereby eliminating the use of one circuit board 10 and the space occupied, saving costs and reducing the occupied space. At the same time, the installation steps of two circuit boards 10 are eliminated, thereby solving the problems of complex installation and large space occupied when using two circuit boards 10, and can meet the use in different environments.

[0040] In this embodiment, the circuit board 10 is designed in a circular ring shape, so that the circuit board 10 can be sleeved on the rotating shaft and spaced apart from the rotating shaft, so that the conductive member 20 can better contact the rotating shaft to conduct the shaft current of the rotating shaft.

[0041] It should be noted that the electrical function of the circuit board 10 is: by adding a wire bypass connected to the electronic device 30 (resistor and capacitor), the voltage ratio between the inner and outer rings of the bearing is reduced by the capacitor connected in parallel with the bearing, so as to avoid EDM (Electrical Discharge Machining) discharge caused by the breakdown of the oil film when the voltage of the inner and outer rings is too high, thereby causing electrical corrosion to the bearing; at the same time, the capacitor is connected in series with the resistor to reduce the high-frequency loop current and avoid the influence of differential mode voltage on the bearing.

[0042] As an example, the electronic device 30 includes a capacitive device and a resistive device. Of course, in other embodiments, the capacitive device can also be formed by the circuit board 10 itself.

[0043] In actual application, the conductive member 20 can be a conductive structural member such as a conductive brush, a conductive carbon brush, a conductive spring, etc., as long as it can conduct the shaft current of the rotating shaft to the circuit board 10.

[0044] Furthermore, the conductive member 20 can be connected to the circuit board 10 by welding, screw connection, or the like, so as to achieve an electrically conductive connection between the conductive member 20 and the circuit board 10. In some embodiments, the conductive member 20 can be welded to the copper-clad surface of the circuit board 10, thereby ensuring the reliability of the electrical connection between the conductive member 20 and the circuit board 10.

[0045] Similarly, the electronic device 30 can also be connected to the circuit board 10 by welding, screw connection, etc., so as to achieve conductive connection between the electronic device 30 and the circuit board 10. In some embodiments, the electronic device 30 can be welded to the copper-clad surface of the circuit board 10, which can ensure the reliability of the electrical connection between the electronic device 30 and the circuit board 10.

[0046] In actual application, the conductive member 20 and the electronic device 30 can be connected to the same side surface of the circuit board 10, or can be arranged on different side surfaces of the circuit board 10. The conductive member 20 is electrically connected to the electronic device 30 through the conductive path inside the circuit board 10.

[0047] See also Figure 1 In one embodiment of the present invention, the circuit board 10 has a first surface 10a and a second surface 10b opposite to each other, the conductive member 20 is disposed on the first surface 10a, and the electronic device 30 is disposed on the first surface 10a or the second surface 10b.

[0048] In this arrangement, compared to the method of installing the conductive member 20 and the electronic device 30 on the inner side or the outer side of the circuit board 10, by connecting the conductive member 20 to the first surface 10a of the circuit board 10 and connecting the electronic device 30 to the first surface 10a or the second surface 10b of the circuit board 10, the radius range of the circuit board 10 can be shortened to reduce the occupied space of the shaft corrosion suppression assembly 100 and reduce the product volume.

[0049] It should be noted that the first surface 10 a and the second surface 10 b of the circuit board 10 may be the front and back surfaces of the circuit board 10 , respectively.

[0050] See also Figure 1 In one embodiment of the present invention, a center hole 11 is formed in the center of the circuit board 10, the rotating shaft passes through the center hole 11 and is loosely fitted with the center hole 11; the end of the conductive member 20 extends toward the center point of the center hole 11 and maintains contact with the rotating shaft.

[0051] With this arrangement, the rotating shaft can be passed through the center hole 11 of the circuit board 10, so that the end of the conductive member 20 extends into the center hole 11, and the conductive member 20 can be easily contacted with the rotating shaft, so that the shaft current of the rotating shaft can be drawn out through the conductive member 20.

[0052] See also Figure 1 In one embodiment of the present invention, the conductive member 20 includes a conductive bracket 21 and a conductive brush 22; the conductive bracket 21 is connected to the circuit board 10; the conductive brush 22 is connected to the conductive bracket 21, and the end of the conductive brush 22 extends toward the center point of the center hole 11.

[0053] With this arrangement, the conductive brush 22 is connected to the circuit board 10 through the conductive bracket 21, which makes it easier to connect the conductive member 20 to the circuit board 10. In addition, the end of the conductive brush 22 extends toward the center point of the center hole 11 to contact the rotating shaft. In this way, during the rotation of the rotating shaft, the wear of the conductive member 20 on the rotating shaft can be reduced, thereby extending the service life of the rotating shaft.

[0054] In practical applications, the conductive brush 22 and the conductive bracket 21 may be an integral structure, or the conductive brush 22 may be connected to the conductive bracket 21 by bonding, welding, or the like to achieve a conductive connection between the conductive brush 22 and the conductive bracket 21 .

[0055] See also Figure 2 In one embodiment of the present invention, a first limiting protrusion 211 is provided at one end of the conductive bracket 21 away from the conductive brush 22 , and a limiting hole 12 is provided on the first surface 10 a , and the first limiting protrusion 211 is snapped into the limiting hole 12 .

[0056] With such a configuration, during the assembly process, the first limiting protrusion 211 of the conductive bracket 21 is snapped into the limiting hole 12 of the circuit board 10, so that the conductive bracket 21 is positioned in cooperation with the first limiting protrusion 211 and the limiting hole 12, thereby improving the installation accuracy of the conductive part 20.

[0057] In actual application, the first limiting protrusion 211 can be a block-shaped protrusion provided on the outer peripheral side of the conductive bracket 21 , or can be an annular protrusion provided on the outer peripheral side of the conductive bracket 21 .

[0058] See also Figure 2 In one embodiment of the present invention, a second limiting protrusion 212 is provided at one end of the conductive bracket 21 close to the conductive brush 22 , and a limiting groove 13 is provided on the inner side of the circuit board 10 , and the second limiting protrusion 212 is snapped into the limiting groove 13 .

[0059] With such a configuration, during the assembly process, the conductive bracket 21 can be positioned by inserting the second limiting protrusion 212 of the conductive bracket 21 into the limiting groove 13 of the circuit board 10, and the second limiting protrusion 212 and the limiting groove 13 can cooperate to further improve the installation accuracy of the conductive part 20.

[0060] Similarly, in actual application, the second limiting protrusion 212 can be a block-shaped protrusion provided on the outer peripheral side of the conductive bracket 21 , or can be an annular protrusion provided on the outer peripheral side of the conductive bracket 21 .

[0061] See also Figure 1 In one embodiment of the present invention, a plurality of conductive members 20 are provided, and the plurality of conductive members 20 are distributed at intervals along the circumference of the circuit board 10 .

[0062] In this arrangement, by distributing multiple conductive parts 20 at circumferential intervals on the circuit board 10, the multiple conductive parts 20 can contact the rotating shaft. This can avoid the situation where one of the conductive parts 20 does not contact the rotating shaft due to vibration or assembly error. The other conductive parts 20 can also contact the rotating shaft to smoothly conduct the shaft current of the rotating shaft.

[0063] In actual application, the distance between any two adjacent conductive members 20 may be the same or different.

[0064] See also Figure 1 In one embodiment of the present invention, the conductive members 20 are distributed on both sides of the circuit board 10 , and the conductive members 20 are symmetrically arranged along the central axis of the circuit board 10 .

[0065] In this manner, by symmetrically arranging the conductive members 20 along the central axis a, the balance of the shaft electrical corrosion suppression assembly 100 can be ensured while avoiding the electronic components 30 .

[0066] See also Figure 1 In one embodiment of the present invention, the circuit board 10 is provided with a mounting hole 14 , through which the fastener passes to engage with the housing and ground the circuit board 10 .

[0067] With such a configuration, the circuit board 10 can be fixedly mounted on the casing by using bolts or other fasteners in conjunction with the mounting holes 14, thereby ensuring the reliability of the connection between the circuit board 10 and the casing, and further ensuring the reliability of the electrical connection between the circuit board 10 and the casing, and grounding the circuit board 10 so that the shaft current can be smoothly conducted to the casing and discharged.

[0068] In some embodiments, a plurality of mounting holes 14 may be provided, some of the mounting holes 14 may be bolt holes, and some of the mounting holes 14 may be pin holes. The bolt holes cooperate with the bolts to fix the circuit board 10 on the casing, and the pin holes are used to cooperate with the positioning pins on the casing to position the circuit board 10.

[0069] The present invention also provides an electric drive system comprising a housing, a rotating shaft, and a shaft corrosion suppression assembly 100. The specific structure of the shaft corrosion suppression assembly 100 is similar to the above-described embodiments. Since the present electric drive system utilizes all the technical solutions of all of the above-described embodiments, it possesses at least all the beneficial effects of the technical solutions of the above-described embodiments, which will not be further detailed here. The rotating shaft is disposed within the housing; the conductive member 20 of the shaft corrosion suppression assembly 100 contacts the circumferential surface and / or end surface of the rotating shaft.

[0070] It is understandable that the circuit board 10 of the shaft electrical corrosion suppression assembly 100 can be fixed to the housing by means of connectors such as bolts and snaps, and can be electrically connected to the housing.

[0071] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A shaft electrical corrosion suppression assembly, characterized in that: include: A circuit board, wherein the circuit board is in a ring shape; a conductive member connected to the circuit board; An electronic device is connected to the circuit board, and the conductive member is electrically connected to the electronic device through the circuit board.

2. The shaft galvanic corrosion suppression assembly according to claim 1, wherein: The circuit board has a first surface and a second surface that are opposite to each other. The conductive member is provided on the first surface, and the electronic device is provided on the first surface or the second surface.

3. The shaft galvanic corrosion suppression assembly according to claim 2, wherein: A central hole is formed at the center of the circuit board, and the rotating shaft passes through the central hole and is loosely fitted with the central hole; the end of the conductive member extends toward the center point of the central hole and maintains contact with the rotating shaft.

4. The shaft galvanic corrosion suppression assembly according to claim 3, wherein: The conductive member comprises: A conductive bracket connected to the circuit board; A conductive brush is connected to the conductive bracket, and an end of the conductive brush extends toward the center point of the central hole.

5. The shaft electrical corrosion suppression assembly according to claim 4, wherein: A first limiting protrusion is provided on one end of the conductive bracket away from the conductive brush, and a limiting hole is provided on the first surface, and the first limiting protrusion is inserted into the limiting hole; And / or, a second limiting protrusion is provided at one end of the conductive bracket close to the conductive brush, a limiting groove is provided on the inner side of the circuit board, and the second limiting protrusion is snapped into the limiting groove.

6. The shaft electrical corrosion suppression assembly according to any one of claims 1 to 5, characterized in that: There are multiple conductive members, and the multiple conductive members are distributed at intervals along the circumference of the circuit board.

7. The shaft galvanic corrosion suppression assembly according to claim 6, wherein: The conductive members are distributed on both sides of the circuit board, and are symmetrically arranged along the central axis of the circuit board.

8. The shaft electrical corrosion suppression assembly according to any one of claims 1 to 5, characterized in that: The conductive member and / or the electronic component are soldered to the circuit board.

9. The shaft electrical corrosion suppression assembly according to any one of claims 1 to 5, characterized in that: The electronic device includes a capacitive device and a resistive device.

10. The shaft electrical corrosion suppression assembly according to any one of claims 1 to 5, characterized in that: The circuit board is provided with a mounting hole, and the fastener passes through the mounting hole to cooperate with the casing and ground the circuit board.

11. An electric drive system, characterized in that: include: chassis; a rotating shaft, the rotating shaft being arranged in the housing; The shaft electrical corrosion suppression assembly according to any one of claims 1 to 10, wherein the conductive member of the shaft electrical corrosion suppression assembly is in contact with the peripheral surface and / or end surface of the rotating shaft.

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