Fixing structure for auxiliary bearing of electric drive assembly and electric drive assembly

Abstract

An auxiliary bearing fixing structure for an electric drive assembly and an electric drive assembly, the fixing structure including a bearing retainer plate (1), a bolt (6), a lock nut (8), an auxiliary bearing outer ring (2), and an auxiliary bearing inner ring (3), the bearing retainer plate (1) has a through hole, the housing (9) has a threaded hole, and the bolt (6) passes through the through hole and is fixed into the threaded hole, the bearing retainer plate (1) biases one side of the auxiliary bearing outer ring (2), the housing (9) positions the other side of the bearing outer ring (2), the lock nut (8) is fitted onto the shaft (4) and biases one side of the auxiliary bearing inner ring (3), and the gear (5) positions the other side of the auxiliary bearing inner ring (3). The auxiliary bearing fixing structure for the electric drive assembly is simple in structure, and the inner and outer rings of the bearing both generate biasing force by screw bias, preventing over-positioning of the bearing, reducing bearing operating noise, and improving bearing life.

Description

[Technical field]

[0001] The present invention relates to the field of manufacturing electric drive assemblies, and in particular to a fixing structure of an auxiliary bearing of an electric drive assembly and an electric drive assembly. [Background technology]

[0002] In current pure electric vehicles or hybrid new energy vehicles, the bearings on the reducer shaft and motor shaft in the electric drive assembly are often overly constrained, while the motor has a wide rotation range and high rotation speed, so the bearings are prone to outer ring rotation (relative sliding between the bearing hole and the shaft) and displacement (play) when operating at high rotation range, which causes the bearing hole to wear out severely and increases the vibration during operation, which not only shortens the life of the bearing, but also generates abnormal noise and affects the ride comfort of the vehicle. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention has been proposed in view of the above problems, and provides a fixing structure for an auxiliary bearing of an electric drive assembly and an electric drive assembly to solve or at least partially solve the above problems. [Means for solving the problem]

[0004] In order to achieve the above objectives, the technical solution of the present invention is realized as follows:

[0005] In one aspect of the present invention, there is provided a fixing structure for an auxiliary bearing of an electric drive assembly, the electric drive assembly including a reducer and a motor, an input shaft of the reducer and a motor shaft of the motor are the same shaft, a gear is attached to the input shaft of the reducer, and the auxiliary bearing is provided in a bearing hole of a housing between the reducer and the motor, the fixing structure includes a bearing presser plate, a bolt, a lock nut, an auxiliary bearing outer ring, and an auxiliary bearing inner ring, a through hole is formed in the bearing presser plate, a screw hole is formed in the housing, and the bolt is fixed into the screw hole through the through hole, the bearing presser plate urges one side of the auxiliary bearing outer ring, the housing positions the other side of the bearing outer ring, the lock nut is fitted around the shaft and urges one side of the auxiliary bearing inner ring, and the gear positions the other side of the auxiliary bearing inner ring.

[0006] Also, the bearing retainer plate and the lock nut may be located on the same side or on different sides of the auxiliary bearing.

[0007] Also, the bolt head and the bearing presser plate may be located on the same side or on different sides of the auxiliary bearing.

[0008] The bolt may be a hexagonal flange bolt.

[0009] A seal gasket may be further assembled under the flange surface of the hexagonal flange bolt.

[0010] The edge of the bearing retainer plate may be chamfered.

[0011] Furthermore, an anti-loosening ring may be further provided on the outside of the lock nut.

[0012] In another aspect of the present invention, there is provided an electric drive assembly including a fixing structure for an auxiliary bearing according to any one of the above claims. Effect of the Invention

[0013] The technical solution of the present invention has the following advantages:

[0014] In the fixing structure of the auxiliary bearing of the present invention, one side of the inner ring of the bearing is pressed against the end face of the gear, and the inner ring of the bearing is fixed in the axial direction on the other side via the biasing force of a lock nut and the threads on the shaft, and the bearing presser plate is tightened to the housing with a hexagonal flange bolt, pressing the outer ring of the bearing into the bearing hole and restricting its position in the axial and circumferential directions, preventing over-positioning and displacement of the bearing. At the same time, the auxiliary bearing and the housing bearing hole are pressed and restricted in position by the presser plate, thereby avoiding the phenomenon of rotation when the bearing rotates at high speed.

[0015] This bearing fixing method has a simple structure, and the inner and outer rings of the bearing generate a biasing force by screw biasing, which prevents overpositioning of the bearing, reduces operating noise of the bearing, and improves the life of the bearing.

[0016] The above description is merely an outline of the technical solution of the present invention. In order to make the technical means of the present invention more clearly understood and to implement them in accordance with the content of the specification, and to more easily understand the above and other objects, features and advantages of the present invention, the following particularly illustrates specific embodiments of the present invention.

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In addition, like reference numerals refer to like parts throughout the drawings. [Brief description of the drawings]

[0018] [Figure 1]FIG. 1 is a schematic diagram of a fixing structure of an auxiliary bearing of an electric drive assembly in one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although exemplary embodiments of the present invention are illustrated in the drawings, it should be understood that the present invention may be realized in various forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the present invention may be better understood and the scope of the present invention may be fully conveyed to those skilled in the art.

[0020] 1 is a schematic diagram of an auxiliary bearing fixing structure of an electric drive assembly in one embodiment of the present invention, the electric drive assembly in this embodiment includes a reducer and a motor, in which the input shaft of the reducer and the motor shaft of the motor are the same shaft, and the input shaft and the motor shaft are fixedly connected together to simplify the structure of the electric drive assembly, improve the transmission efficiency, and reduce the design and manufacturing costs. A gear 5 is attached to the input shaft of the reducer, and the auxiliary bearing is installed in a bearing hole of a housing 9 between the reducer and the motor.

[0021] 1, the auxiliary bearing fixing structure in this embodiment includes a bearing pressure plate 1, a bolt 6, a lock nut 8, an auxiliary bearing outer ring 2, and an auxiliary bearing inner ring 3, the bearing pressure plate 1 is provided with a through hole, the housing 9 is provided with a screw hole, the bolt 6 passes through the through hole and is fixed into the screw hole, the bearing pressure plate 1 presses one side of the auxiliary bearing outer ring 2, the housing regulates the position of the other side of the auxiliary bearing outer ring 2, the lock nut 8 is fitted around the shaft and presses one side of the auxiliary bearing inner ring 3, and the gear 5 regulates the position of the other side of the auxiliary bearing inner ring 3. In this embodiment, the specific positional relationship between the bearing pressure plate 1 and the lock nut 8 is not limited, and the bearing pressure plate may be provided on the same side as the lock nut or on a different side according to the specific structure of the housing.

[0022] The auxiliary bearing fixing structure disclosed in this embodiment of the present invention presses the outer ring of the bearing into the bearing hole to restrict its position in the axial and circumferential directions, preventing over-positioning and displacement of the bearing, and at the same time, the auxiliary bearing and the housing bearing hole are pressed and restricted in position by the pressing plate, thereby preventing the bearing from rotating at high speed. This bearing fixing mode has a simple structure, and the inner and outer rings of the bearing both generate a biasing force by screw biasing, preventing over-positioning of the bearing, reducing the operating noise of the bearing, and improving the life of the bearing.

[0023] In one embodiment, depending on the housing features, the bearing retainer plate 1 and the lock nut 8 can be located on the same side or different sides of the auxiliary bearing to facilitate mounting of the bearing retainer plate.

[0024] In one embodiment, the mounting position of the bolt 6 can also be selected according to the shape features of the housing and the actual mounting requirements, whether the head of the bolt 6 and the bearing retainer plate are disposed on the same side of the auxiliary bearing or on different sides.

[0025] In one embodiment, the bolts are hexagonal flange bolts, and a sealing gasket is further assembled under the flange surface of the hexagonal flange bolt according to the need for sealing the internal cavity of the reducer and for assembly; of course, a bolt type with a similar structure or other gasket structure may be selected.

[0026] In one preferred embodiment, depending on assembly and design needs, the edge of the bearing pressure plate may be provided with a chamfer which may be a flat or arcuate surface, and an anti-loosening ring may be provided on the outside of the lock nut to prevent the lock nut from loosening.

[0027] In another aspect of the present invention, there is provided an electric drive assembly including a fixing structure for an auxiliary bearing according to any one of the above claims.

[0028] In summary, the fixing structure disclosed in the present invention includes a bearing pressure plate, a bolt, a lock nut, an auxiliary bearing outer ring, and an auxiliary bearing inner ring, the bearing pressure plate is provided with a through hole, the housing is provided with a screw hole, the bolt passes through the through hole and is fixed into the screw hole, the bearing pressure plate biases one side of the auxiliary bearing outer ring, the housing positions the other side of the bearing outer ring, the lock nut is fitted on the shaft to bias one side of the auxiliary bearing inner ring, and the gear positions the other side of the auxiliary bearing inner ring. This technical solution has a simple structure, and the inner and outer rings of the bearing generate biasing forces through screw biasing, which prevents over-positioning of the bearing, reduces operating noise of the bearing, and improves the life of the bearing.

[0029] The above is merely a specific embodiment of the present invention, and the protection scope of the present invention is not limited thereto. Any modifications or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention shall be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be in accordance with the protection scope of the attached claims. [Explanation of symbols]

[0030] 1 Bearing retainer plate, 2 Auxiliary bearing outer ring, 3 Auxiliary bearing inner ring, 4 Shaft, 5 Gear, 6 Bolt, 7 Seal ring, 8 Lock nut, 9 Housing.

Claims

1. 1. A fixing structure for an auxiliary bearing of an electric drive assembly, comprising: the electric drive assembly includes a reducer and a motor, an input shaft of the reducer and a motor shaft of the motor are the same shaft, a gear is attached to the input shaft of the reducer, and the auxiliary bearing is provided in a bearing hole of a housing between the reducer and the motor; the fixing structure includes a bearing presser plate, a bolt, a lock nut, an auxiliary bearing outer ring, and an auxiliary bearing inner ring, the bearing presser plate has a through hole, the housing has a screw hole, the bolt passes through the through hole and is fixed into the screw hole, the bearing presser plate urges one side of the auxiliary bearing outer ring, the housing restricts the position of the other side of the auxiliary bearing outer ring, the lock nut is fitted around the shaft and urges one side of the auxiliary bearing inner ring, and the gear restricts the position of the other side of the auxiliary bearing inner ring, Thus, the inner and outer rings of the auxiliary bearing both generate a biasing force by screw biasing, thereby providing a fixing structure for an auxiliary bearing in an electric drive assembly.

2. 2. The auxiliary bearing fixing structure according to claim 1, wherein the bearing pressing plate and the lock nut are located on the same side or different sides of the auxiliary bearing.

3. 3. The auxiliary bearing fixing structure according to claim 1, wherein the bolt is a hexagonal flange bolt.

4. 4. The auxiliary bearing fixing structure according to claim 3, further comprising a seal gasket assembled under the flange surface of the hexagonal flange bolt.

5. 2. The auxiliary bearing fixing structure according to claim 1, wherein the edge of the bearing pressing plate is chamfered.

6. An electric drive assembly including a fixing structure for an auxiliary bearing according to any one of claims 1 to 4.

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