Bearing fixing device and electric assembly

Abstract

The invention discloses a bearing fixing device and an electric assembly, and the bearing fixing device comprises a bearing seat which is arranged in a housing, the bearing seat is provided with a through hole used for installing a bearing, the inner side of the bearing seat is provided with an annular groove, and the annular groove is located at the periphery of the through hole; the limiting ring is connected with the annular groove in an inserted mode, and the inner circumference of the limiting ring makes contact with the outer ring of the bearing and is used for limiting the bearing; the bearing seat comprises at least two seat bodies in the circumferential direction of the limiting ring, and each seat body is connected with the shell. According to the bearing fixing device disclosed by the embodiment of the invention, the limiting ring is arranged, so that the bearing can be limited, the outer ring of the bearing can be prevented from wriggling in the running process of the bearing, the centering degree of the bearing can be ensured, the running heating value of the bearing can be reduced, and the micro-motion corrosion of the bearing can be reduced; the use reliability and stability of main body parts can be improved, meanwhile, the shell grinding phenomenon of the bearing can be avoided, and damage to the shell or the bearing can be reduced.

Description

Technical Field

[0001] This invention relates to the field of motor component technology, and in particular to a bearing fixing device and an electric assembly. Background Technology

[0002] With the continuous development of new energy vehicles, electric drive reducers are receiving increasing attention from major domestic OEMs, leading to increasingly stringent requirements for the strength, lifespan, noise, and vibration of bearings used in these reducers. Currently, existing bearings and bearing housings typically use a clearance fit, which causes creep in the outer ring of the bearing during operation, easily resulting in shell wear. This also leads to deterioration in cleanliness, reduced neutrality, overheating, and fretting corrosion, indicating room for improvement. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a bearing fixing device that can limit the bearing to prevent the outer ring of the bearing from creeping.

[0004] The present invention also proposes an electric powertrain.

[0005] According to a first aspect of the present invention, a bearing fixing device includes: a bearing housing disposed on a housing, the bearing housing having a through hole for mounting a bearing, and an annular groove on the inner side of the bearing housing located on the outer periphery of the through hole; a limiting ring, the limiting ring being inserted into the annular groove, and the inner periphery of the limiting ring contacting the outer ring of the bearing for limiting the bearing; wherein, along the circumferential direction of the limiting ring, the bearing housing includes at least two seat bodies, each of the seat bodies being connected to the housing.

[0006] According to the bearing fixing device of the present invention, by setting a limiting ring, the bearing can be limited, the outer ring of the bearing can be prevented from creeping during the bearing operation, the bearing alignment can be guaranteed, the heat generated during bearing operation can be reduced, the fretting corrosion of the bearing can be reduced, the reliability and stability of the main components can be improved, the bearing can be prevented from wearing the bearing shell, the damage to the shell or bearing can be reduced, and the service life of the main components can be increased.

[0007] According to some embodiments of the present invention, the inner circumference of the limiting ring is located within the through hole, so that there is a gap between the outer ring of the bearing and the inner circumference of the bearing housing.

[0008] According to some embodiments of the present invention, the limiting ring and the annular groove are interference-fitted.

[0009] According to some embodiments of the present invention, the limiting ring and the outer ring of the bearing are interference fit.

[0010] According to some embodiments of the present invention, the annular groove includes at least two, the at least two annular grooves are arranged along the axial direction of the bearing seat, and each annular groove is inserted with a limiting ring.

[0011] According to some embodiments of the present invention, a plurality of said seats are arranged in a ring to surround the through hole for mounting the bearing.

[0012] According to some embodiments of the present invention, a plurality of the seats are arranged in a ring, each seat having a groove, and the plurality of grooves are connected end to end to form the annular groove.

[0013] According to some embodiments of the present invention, each of the base and the housing is connected by fasteners.

[0014] According to some embodiments of the present invention, the limiting ring is a nylon ring.

[0015] According to a second aspect of the present invention, an electric power assembly includes: a reducer, a drive unit, and a bearing fixing device according to a first aspect of the present invention. The bearing housing is connected to the housing of the reducer and / or the drive unit. By employing the bearing fixing device, the outer ring of the bearing can be prevented from creeping during bearing operation, damage to the housing or bearing can be reduced, and the service life of the main components can be improved.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a bearing fixing device according to some embodiments of the present invention; Figure 2 This is an exploded schematic diagram of a bearing fixing device according to some embodiments of the present invention; Figure 3 This is an exploded schematic diagram of a bearing housing according to some embodiments of the present invention.

[0018] Figure label: Bearing fixing device 100, Bearing housing 10, seat body 11, groove 111, annular groove 12, through hole 13 Limiting ring 20, bearing 30, fastener 40. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The following is for reference. Figures 1-3 A bearing fixing device 100 according to an embodiment of the present invention is described.

[0023] like Figures 1-3 As shown, the bearing fixing device 100 according to an embodiment of the present invention includes: a bearing housing 10 and a limiting ring 20. The bearing housing 10 can be disposed on a housing (such as the housing of a motor, engine, or reducer). The bearing housing 10 can have a through hole 13 for mounting a bearing 30, and the inner side of the bearing housing 10 can have an annular groove 12. The annular groove 12 can be located on the outer periphery of the through hole 13. The limiting ring 20 and the annular groove 12 can be inserted and fitted together, and the inner periphery of the limiting ring 20 can contact the outer ring of the bearing 30, thereby limiting the bearing 30.

[0024] Therefore, it can prevent the outer ring of the bearing 30 from creeping during the operation of the bearing 30, ensure the alignment of the bearing 30, reduce the heat generated during the operation of the bearing 30, reduce the fretting corrosion of the bearing 30, avoid the bearing 30 from wearing the shell, reduce damage to the shell or the bearing 30, improve the service life of the main components, reduce the degree of deterioration of the cleanliness of the bearing fixing device 100, and facilitate maintenance. In particular, along the circumference of the limiting ring 20, the bearing housing 10 can include at least two housing bodies 11, each of which can be connected to the shell, which can prevent the bearing 30 from interfering with the bearing housing 10 during the installation and removal process, thereby facilitating the installation and removal of the bearing housing 10, the bearing 30, and the limiting ring 20.

[0025] According to the present invention, the bearing fixing device 100 can limit the bearing 30 by setting the limiting ring 20, which can prevent the outer ring of the bearing 30 from creeping during the operation of the bearing 30, ensure the alignment of the bearing 30, reduce the heat generation of the bearing 30 during operation, reduce the fretting corrosion of the bearing 30, improve the reliability and stability of the main components, avoid the bearing 30 from wearing off, reduce damage to the housing or bearing 30, and improve the service life of the main components.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, the inner circumference of the limiting ring 20 can be located within the through hole 13, and the inner circumference of the limiting ring 20 can contact the outer ring of the bearing 30, thereby limiting the bearing 30, preventing the bearing 30 from moving axially, and preventing the outer ring of the bearing 30 from rotating circumferentially, thus preventing the bearing 30 from creeping, and reducing damage to the housing or bearing 30. At the same time, it can make the outer ring of the bearing 30 and the inner circumference of the bearing seat 10 clearance fit, which can prevent the bearing seat 10 from being worn due to the creep of the outer ring of the bearing 30, thereby improving the service life of the bearing 30 and the bearing seat 10, and improving the service life of the main components.

[0027] like Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the limiting ring 20 and the annular groove 12 can be interference-fitted, which can increase the force between the limiting ring 20 and the annular groove 12, prevent the limiting ring 20 from creeping under the action of external force, improve the fixing effect on the bearing 30, and facilitate disassembly and assembly.

[0028] like Figure 1 and Figure 2As shown, according to some embodiments of the present invention, the limiting ring 20 and the outer ring of the bearing 30 can be interference-fitted, which can increase the force between the limiting ring 20 and the outer ring of the bearing 30, prevent the outer ring of the bearing 30 from creeping under the action of external force, improve the fixing effect of the bearing 30, and facilitate disassembly and assembly.

[0029] like Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the annular groove 12 may include at least two, and the at least two annular grooves 12 may be along the axial direction of the bearing housing 10 (e.g., Figure 2 The annular grooves 12 are arranged in the front-back direction as shown, and each annular groove 12 can be connected to a limiting ring 20. That is, by increasing the number of limiting rings 20, the force between multiple limiting rings 20 and the outer ring of the bearing 30 can be increased, which can prevent the outer ring of the bearing 30 from creeping under the action of external force, improve the fixing effect of the bearing 30, and facilitate disassembly and assembly. Specifically, there can be two annular grooves 12 and two limiting rings 20.

[0030] like Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the limiting ring 20 and the bearing 30 can be two separate parts, which can avoid the bearing 30 from being replaced due to the failure of the limiting ring 20 and reduce the maintenance cost of the bearing fixing device 100.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, a plurality of seats 11 can be arranged in a ring to form a through hole 13 for mounting the bearing 30, so that the plurality of seats 11 can move radially along the bearing 30 to realize the assembly and disassembly of the bearing seat 10. This can prevent the bearing 30 from interfering with the bearing seat 10 during the assembly and disassembly process, and can also prevent the limiting ring 20 from interfering with the bearing seat 10 during the assembly and disassembly process, thereby facilitating the assembly and disassembly of the bearing seat 10, the assembly and disassembly of the bearing 30, and the assembly and disassembly of the limiting ring 20.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, multiple seats 11 can be arranged in a ring, and each seat 11 can have a groove 111. The multiple grooves 111 of the multiple seats 11 can be connected end to end in sequence to form an annular groove 12, so that the multiple seats 11 can cooperate to fix the limiting ring 20 together. The fixing effect is good, and it is convenient to disassemble and assemble the bearing seat 10, convenient to install and remove the bearing 30, and convenient to install and remove the limiting ring 20.

[0033] like Figure 1 , Figure 2 and Figure 3As shown, according to some embodiments of the present invention, each seat 11 and the housing can be connected by fasteners 40, which can be screws, bolts or studs, etc., which have a good fastening effect and are easy to operate.

[0034] like Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the limiting ring 20 can be a nylon ring, which can improve the wear resistance energy of the limiting ring 20, improve the corrosion resistance energy and be lighter, and at the same time can achieve the sealing of the gap between the bearing housing 10 and the bearing 30. The nylon ring can be made of PBT-GF20 material, which is made of polybutylene terephthalate (PBT) material with 20% glass fiber (GF) material added.

[0035] In this application, the limiting ring 20 still has an interference fit with the outer ring of the bearing 30 after thermal expansion, which can prevent the outer ring of the bearing 30 from creeping. The limiting ring 20 can be located on the detachable bearing housing 10, which can avoid damage to the costly housing or bearing 30, and can extend the service life of the main components. The operator only needs to install and remove the fasteners 40 to complete the disassembly and assembly of the bearing 30, the limiting ring 20 and the bearing housing 10, which is convenient to operate, reduces maintenance time and labor costs. Furthermore, by replacing the detachable bearing housing 10 and the limiting ring 20 with different inner diameters, different models of bearings 30 can be adapted and installed without changing the housing, which can improve the adaptability of the bearing fixing device 100. The bearing 30 can be a deep groove ball bearing or a tapered roller bearing.

[0036] In the prior art, common bearing housings are usually integrally formed with the housing, and the through hole 13 of the bearing housing 10 is opened in the housing. The bearing 30 is installed in the through hole 13 of the housing. When this structure is subjected to a large radial load or vibration impact, a small relative rotation may occur between the outer ring of the bearing and the inner hole of the bearing housing, i.e., "creep". Traditional anti-creep measures usually include machining a keyway in the through hole 13 or installing a set screw, using an interference fit between the inner peripheral wall of the through hole 13 and the outer ring of the bearing 30, and using an anti-creep bearing.

[0037] However, these methods have drawbacks. For example, machining keyways or set screws inside the perforation 13 would compromise the integrity of the perforation 13 and the outer ring of the bearing 30, create stress concentration points and reduce its strength, and make disassembly inconvenient. The interference fit between the inner wall of the perforation 13 and the outer ring of the bearing 30, while preventing creep, makes the installation and removal of the bearing 30 extremely difficult and increases maintenance and replacement costs. The use of anti-creep bearings makes it difficult to provide reliable and non-damaging anti-creep functionality while ensuring convenient disassembly.

[0038] According to an embodiment of the present invention, an electric powertrain includes: a reducer, a drive unit (engine or motor), and a bearing fixing device 100. The bearing housing 10 can be connected to the housing of the reducer, or the bearing housing 10 can be connected to the housing of the drive unit, or the bearing housing 10 can be connected to the housings of the reducer and the drive unit respectively. The inner ring of the bearing 30 can be connected to the rotating shaft (input shaft or output shaft) of the reducer or the drive unit. By using the bearing fixing device 100, the outer ring of the bearing 30 can be prevented from creeping during the operation of the bearing 30, which can reduce damage to the housing or the bearing 30 and improve the service life of the main components.

[0039] In this application, the installation of the bearing fixing device 100 first requires installing the limiting ring 20 onto the detachable bearing housing 10, then installing the detachable bearing housing 10 onto the reducer housing, and fixing the bearing housing 10 onto the housing by tightening the fastener 40 (bolt). Then, high temperature heating is performed (PBT-GF20 material has a durability temperature of 120~140℃) to cause thermal expansion of the bearing housing 10 and the limiting ring 20, and then the bearing 30 is installed into the bearing housing 10.

[0040] At this time, the bearing 30 and the limiting ring 20 are in clearance fit. When the bearing housing 10 dissipates heat to room temperature, the limiting ring 20 is in interference fit with the bearing 30 and the bearing housing 10 respectively, which can generate friction on the outer ring of the bearing 30, thereby preventing the bearing 30 from creeping. In addition, the bearing housing 10 and the bearing 30 can be removed simply by removing the fastener 40 (bolt), which is convenient for disassembly.

[0041] Other configurations and operations of the bearing fixing device 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The vertical, horizontal, and front-back directions are defined as shown in the figures.

[0042] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," 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 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.

[0044] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A bearing fixing device, characterized in that, include: A bearing housing is disposed in the housing. The bearing housing has a through hole for mounting a bearing, and the bearing housing has an annular groove on its inner side, the annular groove being located on the outer periphery of the through hole. A limiting ring is inserted into the annular groove, and the inner circumference of the limiting ring contacts the outer ring of the bearing to limit the bearing. Along the circumference of the limiting ring, the bearing seat includes at least two seats, each of which is connected to the housing.

2. The bearing fixing device according to claim 1, characterized in that, The inner circumference of the limiting ring is located within the through hole, so that there is a gap between the outer ring of the bearing and the inner circumference of the bearing housing.

3. The bearing fixing device according to claim 1, characterized in that, The limiting ring and the annular groove are interference-fitted.

4. The bearing fixing device according to claim 1, characterized in that, The limiting ring and the outer ring of the bearing are interference fit.

5. The bearing fixing device according to claim 1, characterized in that, The annular groove includes at least two, which are arranged along the axial direction of the bearing seat, and each annular groove is fitted with a limiting ring.

6. The bearing fixing device according to claim 1, characterized in that, Multiple of the aforementioned seats are arranged in a ring to enclose the through hole for mounting the bearing.

7. The bearing fixing device according to claim 1, characterized in that, Multiple seats are arranged in a ring, each seat has a groove, and the multiple grooves are connected end to end to form the annular groove.

8. The bearing fixing device according to claim 1, characterized in that, Each of the bases and the housings is connected by fasteners.

9. The bearing fixing device according to claim 1, characterized in that, The limiting ring is a nylon ring.

10. An electric powertrain, characterized in that, include: The reducer, the drive unit, and the bearing fixing device according to any one of claims 1-9, wherein the bearing housing is connected to the housing of the reducer and / or the drive unit.

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