Electric drive transmission system structure capable of shortening axial size

Abstract

The utility model discloses an electric drive transmission system structure capable of shortening the axial size, which comprises a rear box body, an output end bearing and an output shaft are arranged in the rear box body, a transmission assembly used for driving the output shaft to rotate is arranged in the rear box body, the output end bearing is arranged between the outer end of the output shaft and the transmission assembly, and the output end bearing is arranged between the output shaft and the transmission assembly. The number of bearings of the output shaft of the electric drive transmission system structure is reduced, so that the axial occupied space of the overall structure of the overall output end is shortened, the size is reduced, meanwhile, the reduction of the number of the bearings facilitates improvement of transmission efficiency, and the bearings are arranged between the outer end of the output shaft and a transmission assembly, so that internal and external loads are more balanced; and the condition that the single side of the output shaft is overloaded or inclined is avoided, the manufacturing cost, the maintenance cost and the overall weight can be directly reduced, the small-sized and light-weight electric drive utilization of different products is better met, and the application range is wider.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electric drive system, especially relates to an electric drive system structure with shortened axial dimension. BACKGROUND

[0002] At present, the transmission, reduction gearbox and electric drive system of new energy on the market are all loaded with at least one bearing at both ends of the shaft, so as to improve the smoothness of the transmission system, reduce friction, reduce noise and improve the service life of the transmission system. However, with the development of the times, the market has higher and higher requirements for the miniaturization and light weight of the electric drive system, and the selection of bearings will be very cautious. The traditional electric drive system cannot meet the development of the present industry, and the more bearings result in a longer output shaft, higher weight and higher cost.

[0003] Therefore, the existing electric drive system needs to be further improved. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing an electric drive system structure with shortened axial dimension, which can shorten the length of the output shaft, thereby reducing the axial dimension of the transmission system, reducing the use of bearings, improving the efficiency of the transmission system and reducing the weight and cost of the transmission system.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following scheme:

[0006] An electric drive system structure with shortened axial dimension, comprising a rear box body, an output end bearing and an output shaft are arranged in the rear box body, a transmission assembly for driving the output shaft to rotate is arranged in the rear box body, and the output end bearing is arranged between the outer end of the output shaft and the transmission assembly.

[0007] Further, the transmission assembly comprises a driving motor installed in the rear box body, the output end of the driving motor is provided with a driving gear, the inner end of the output shaft is provided with a driven gear, and the driving gear and the driven gear are in meshing transmission.

[0008] Further, the rear box body is provided with a first bearing fixing seat and a second bearing fixing seat.

[0009] Further, the first bearing fixing seat is arranged on the left upper side of the second bearing fixing seat.

[0010] Further, the output end bearing is fixedly installed in the first bearing fixing seat in interference fit;

[0011] The second bearing fixing seat is fixedly installed with a motor bearing in interference fit, and the output end of the driving motor penetrates through the motor bearing.

[0012] In summary, the present invention has the following beneficial effects compared to the prior art:

[0013] The present invention solves the shortcomings of the existing electric drive transmission system. Through the structural arrangement of the present invention, it has the following advantages: by reducing the number of bearings of the output shaft of the electric drive transmission system structure, the axial space occupied by the overall output end structure is shortened, the volume is reduced, and at the same time, reducing the number of bearings can help improve the transmission efficiency. The bearing is arranged between the outer end of the output shaft and the transmission component, so that the internal and external loads are more balanced, and the output shaft is prevented from being overloaded or tilted on one side. It can also directly reduce the manufacturing cost, maintenance cost and overall weight, and is more in line with the miniaturization and lightweight electric drive utilization of different products. It has a wider range of applications, a simple structure, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 This is a schematic diagram of the structure of a traditional electric drive transmission system; DETAILED DESCRIPTION

[0016] 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 creative efforts are within the scope of protection of the present invention.

[0017] See also Figures 1-2 The utility model provides an electric drive transmission system structure with shortened axial dimensions, including a rear box body 1, characterized in that an output end bearing 2 and an output shaft 3 are provided in the rear box body 1, a transmission assembly 4 for driving the output shaft 3 to rotate is provided in the rear box body 1, and the output end bearing 2 is provided between the outer end of the output shaft 3 and the transmission assembly 4.

[0018] The transmission assembly 4 of the present invention includes an active motor 401 installed in the rear box 1, a driving gear 402 is provided at the output end of the active motor 401, and a passive gear 403 is provided at the inner end of the output shaft 3, and the active gear 402 and the passive gear 403 are meshed for transmission;

[0019] Compared with the traditional electric drive system structure, the additional Figure 2 The bearing component A shown greatly improves the efficiency of the transmission system and reduces the manufacturing cost and weight of the overall structure;

[0020] And effectively shorten the output shaft axial size, ensure that the electric drive system structure is more in line with the application of lightweight products;

[0021] Output end bearing 2 is arranged in the middle of output shaft 3, one end provides rotating power for external parts, and the other end is connected with transmission assembly 4, so that the force of both ends of output shaft 3 is uniform.

[0022] The rear box body 1 is internally provided with a first bearing fixing seat 100 and a second bearing fixing seat 200.

[0023] The first bearing fixing seat 100 is arranged on the left upper side of the second bearing fixing seat 200.

[0024] The output end bearing 2 is fixedly installed in the first bearing fixing seat 100 in interference fit;

[0025] The second bearing fixing seat 200 is internally provided with a motor bearing 300 in interference fit, and the output end of the driving motor 401 passes through the motor bearing 300.

[0026] The basic principle and main features of the utility model are shown and described, and the advantages of the utility model are shown and described, and the skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and the utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. An electric drive system structure with a shortened axial dimension, comprising a rear case (1), characterized in that: The rear box body (1) is provided with an output end bearing (2) and an output shaft (3), the rear box body (1) is provided with a transmission assembly (4) for driving the output shaft (3) to rotate, and the output end bearing (2) is arranged between the output shaft (3) and the transmission assembly (4).

2. The electric drive system structure of claim 1, wherein: The transmission assembly (4) comprises a driving motor (401) mounted in the rear box body (1), the output end of the driving motor (401) is provided with a driving gear (402), the inner end of the output shaft (3) is provided with a driven gear (403), and the driving gear (402) and the driven gear (403) are in meshing transmission.

3. An electric drive system structure of reduced axial dimension according to claim 2, characterized in that: The rear box body (1) is provided with a first bearing fixing seat (100) and a second bearing fixing seat (200).

4. An electric drive system arrangement of reduced axial dimension according to claim 3, characterized in that: The first bearing fixing seat (100) is arranged on the left side of the second bearing fixing seat (200) and above the second bearing fixing seat (200).

5. An electric drive system arrangement of reduced axial dimension according to claim 4, characterized in that: The outer surface of the output end bearing (2) is fixedly installed in the first bearing fixing seat (100) in interference fit; The second bearing fixing seat (200) is provided with a motor bearing (300) fixedly installed in interference fit, and the output end of the driving motor (401) penetrates through the motor bearing (300).

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