Integrated motor shaft and gear

Abstract

The utility model relates to an integrated motor shaft and gear, and belongs to the technical field of new energy automobile parts. The integrated motor shaft and the gear are integrated and comprise the motor shaft and the gear which are of an integrated structure. Bearing mounting positions are arranged at two ends of the motor shaft; a rotary transformer rotor mounting position is arranged on the outer side of one bearing mounting position, and a gear is arranged on the outer side of the other bearing mounting position; a bearing mounting position is arranged on the outer side of the gear; and unequal-diameter lightening holes are formed in the inner part along the axis. According to the technical scheme, the gear precision is higher, and the machining cost is lower; and the product has the advantage of light weight, and the weight of the assembly is effectively reduced. And due to no spline connection, the risk of spline failure is reduced, and compared with spline connection, the motor shaft and gear integrated structure improves the overall rigidity of the speed reducer assembly and is higher in reliability.

Description

Technical Field

[0001] The utility model relates to an integrated motor shaft and gear, belonging to the technical field of new energy vehicle components. Background Art

[0002] With the continuous development of the automotive industry, new energy reducers and the entire power system need to face increasingly complex working conditions. Users are increasingly demanding that the weight, space and reliability of reducers be balanced. The motor shaft and gear are important components of automotive reducers. The traditional motor shaft weight reduction hole structure and the split structure in which the motor shaft and gear are connected by splines (such as Figure 2 As shown in the figure), it can no longer meet the automotive industry's development requirements for the reducer's weight, space occupied, and reliability. Utility Model Content

[0003] The purpose of the utility model is to provide an integrated motor shaft and gear, and at the same time process the weight-reducing hole of the motor shaft into a structure of unequal diameters to solve the above problems.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The integrated motor shaft and gear include an integrated motor shaft and gear; bearing mounting positions are set at both ends of the motor shaft; the outer side of one bearing mounting position is a rotating rotor mounting position, and the outer side of the other bearing mounting position is a gear; a bearing mounting position is set on the outer side of the gear; and unequal diameter weight reduction holes are set inside along the axis.

[0006] A further improvement of the technical solution of the utility model is that the unequal diameter weight-reducing holes have a structure that is thick in the middle and thin at both ends.

[0007] A further improvement of the technical solution of the present utility model is that the surface of the motor shaft is the mounting position of the motor rotor core.

[0008] A further improvement of the technical solution of the utility model is that arc surfaces are used for transition between different diameter sections of the unequal diameter weight-reducing holes.

[0009] Due to the adoption of the above technical solution, the technical effects achieved by the utility model are as follows:

[0010] (1) Higher gear precision: This technical solution does not require spline connection and eliminates the press-fitting process, so there is no problem of press-fitting deformation leading to reduced gear precision. Since the press-fitting force will affect the gear precision when press-fitting, the gear precision is improved by eliminating the press-fitting process.

[0011] (2) Lower processing costs: Since two parts are integrated into one, spline processing, press-fitting and other processes are reduced, and a set of forging dies is reduced, thereby reducing processing costs. In addition, since the lock nut is eliminated, the number of parts is reduced, which also reduces the component cost to a certain extent and reduces the difficulty of the assembly process.

[0012] (3) The product has the advantage of being lightweight: this integrated structure reduces the thickness of the driven gear and the intermediate shaft web, saving axial space. At the same time, the motor shaft adopts an unequal diameter (thin at both ends and thick in the middle) weight-reducing hole structure, making the motor shaft wall thickness uniform. At the same time, the locking nut structure is also eliminated, effectively reducing the weight of the component.

[0013] (4) Higher product reliability: Since there is no spline connection, the risk of spline failure is reduced. Compared with the spline connection, the integrated structure of the motor shaft and gear improves the overall stiffness of the reducer assembly and has higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of a traditional spline-connected motor shaft and gear assembly;

[0016] Among them, 1. motor shaft, 2. gear, 3. bearing mounting position, 4. resolver rotor mounting position, 5. unequal diameter hole, 6. motor rotor core mounting position. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0019] The utility model is an integrated motor shaft and gear, which is specifically used in new energy vehicles and is an important component of a transmission mechanism.

[0020] The utility model is a structure that integrates the motor shaft and the gear. Figure 1As shown, it includes an integrated motor shaft 1 and a gear 2. Bearing mounting positions 3 are provided at both ends of the motor shaft 1 for mounting bearings. A resolver rotor mounting position 4 is provided on the outside of one of the bearing mounting positions 3 for mounting the resolver rotor. A portion of the gear 2 is provided on the outside of the other bearing mounting position 3, and the gear 2 is directly integrated with the motor shaft 1. Furthermore, a bearing mounting position 3 is also provided on the outside of the gear 2 for mounting bearings. The surface of the motor shaft 1 is a motor rotor core mounting position 6 for mounting the motor rotor core.

[0021] Within the integrated motor shaft and gear structure, unequal-diameter lightening holes 5 are provided along the axis to reduce component weight. In a specific implementation, preferably, the unequal-diameter lightening holes 5 are configured to have a thick center and tapered ends. Furthermore, arc-shaped transitions are used between the different diameter sections of the unequal-diameter lightening holes 5.

[0022] This integrated motor shaft and gear structure is preferably made of gear steel. The motor shaft's lightening holes are machined into a unequal diameter structure (thin at the ends and thick in the middle), ensuring a uniform shaft wall thickness. Furthermore, the motor shaft and gear structure are machined into a one-piece structure. Specifically, it includes multiple bearing mounting points, resolver rotor mounting points, motor rotor core mounting points, and a gear structure. Additional bearing mounting points, resolver rotor mounting points, motor rotor core mounting points, and gear structures can be integrated as needed.

[0023] The structural gears of this technical solution have high precision and lower processing costs; the product also has the advantage of being lightweight. Since there is no spline connection, the risk of spline failure is reduced. The integrated structure of the motor shaft and gear improves the overall stiffness of the reducer assembly compared to the spline connection, and is more reliable.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. The integrated motor shaft and gear are characterized by: The invention comprises a motor shaft (1) and a gear (2) of an integrated structure; bearing mounting positions (3) are provided at both ends of the motor shaft (1); the outer side of one of the bearing mounting positions (3) is a rotating rotor mounting position (4), and the outer side of the other bearing mounting position (3) is a gear (2); the bearing mounting position (3) is provided on the outer side of the gear (2); and unequal diameter weight reduction holes (5) are provided inside along the axis.

2. The integrated motor shaft and gear according to claim 1, characterized in that: The unequal diameter weight-reducing hole (5) is a structure with a thick middle and thin ends.

3. The integrated motor shaft and gear according to claim 1, characterized in that: The surface of the motor shaft (1) is a motor rotor core mounting position (6).

4. The integrated motor shaft and gear according to claim 2, characterized in that: Arc surfaces are used to transition between different diameter sections of the unequal diameter lightening holes (5).

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