Automatic gearbox of electric vehicle

Abstract

The utility model discloses an electric vehicle automatic gearbox which comprises a connecting base, an input assembly is installed on the right side wall of the connecting base, a clutch one-way assembly is installed at the output end of the input assembly, and the output end of the clutch one-way assembly is fixedly connected with a transmission shaft. A reverse-gear planetary gear assembly is installed on the right side wall of the clutch one-way assembly, a reverse-gear gear ring assembly is installed in the reverse-gear planetary gear assembly, the output end of the reverse-gear gear ring assembly is in transmission connection with a primary planetary gear assembly, and the output end of the primary planetary gear assembly is fixedly connected with an output end assembly. A shifting fork assembly is installed on the outer side wall of the output end assembly. In the installation process, the motor and the gearbox do not need to be installed on the rear axle, and the stability of a power system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to an automatic gearbox for an electric vehicle. Background Art

[0002] my country's pure electric vehicles are developing rapidly. Large-scale pure electric vehicles have appeared on the market, and pure electric vehicles have entered the stage of large-scale production. There are many types of drive forms for pure electric vehicles. Today, pure electric vehicles commonly use a clutchless single-speed direct drive form. This drive form is that the motor directly drives the wheels through a fixed reduction ratio device, which has the advantage of good transmission smoothness, but the power system has high performance requirements for the motor and battery. In order to take into account the high-speed cruising characteristics, it is inevitable that the vehicle's acceleration and climbing ability are poor and the motor's working efficiency is low. Another typical drive form is a traditional drive system equipped with a multi-speed transmission device, which has the advantages of good acceleration, strong climbing ability and high motor operating efficiency.

[0003] However, the existing two-speed automatic transmission has a complex structure, and during the installation process, the entire weight of the motor and the transmission needs to be installed on the rear axle, which greatly reduces the stability of the transmission. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide an automatic transmission for an electric vehicle, which adopts the original rear axle of a light truck to make the vehicle load safer and more reliable; automatically switches between high and low gears, so that the driving force output during the use of the vehicle is more in line with the vehicle characteristics; in conjunction with the rear axle reduction ratio, the transmission ratio variation range can be increased to adapt to large torque output under heavy load and high speed output under light load; the installation process does not require the entire weight of the motor and the transmission to be installed on the rear axle, which can improve the stability of the power system.

[0005] The utility model also provides an automatic transmission for an electric vehicle as described above, comprising: a connecting seat, an input assembly is installed on the right side wall of the connecting seat, a clutch one-way assembly is installed on the output end of the input assembly, a transmission shaft is fixedly connected to the output end of the clutch one-way assembly, a reverse gear planetary gear assembly is installed on the right side wall of the clutch one-way assembly, a reverse gear ring gear assembly is installed inside the reverse gear planetary gear assembly, the output end of the reverse gear ring gear assembly is transmission-connected to a primary planetary gear assembly, the output end of the primary planetary gear assembly is fixedly connected to the output end assembly, and a shift fork assembly is installed on the outer side wall of the output end assembly.

[0006] According to the automatic transmission of an electric vehicle, a vent plug is installed on the outer side wall of the shift fork assembly.

[0007] According to the described automatic transmission for electric vehicles, a cable bracket is installed between the shift fork assembly and the clutch one-way assembly, and the cable bracket is matched with the shift fork assembly through fixing bolts.

[0008] According to the described automatic transmission for electric vehicles, six output shaft splines are provided on the outer side wall of the output shaft of the output end assembly. The splines are common Japanese standard involute splines EXT 18z×1m×20° for connecting with the motor connecting shaft. The parameters of the output shaft splines 14 are 6×16H7×20H10×4H11. The input and output can select corresponding parameters or accessories according to actual needs.

[0009] According to the described automatic transmission for electric vehicles, the shift fork assembly is matched with the transmission gear inside the output end assembly to change the speed ratio.

[0010] According to the described automatic transmission for electric vehicles, the connecting seat is fixed to the input assembly through socket head cap screws. A standard washer is installed between the nut of the socket head cap screw and the connecting seat to improve the sealing performance of the device connection.

[0011] According to the described automatic transmission for electric vehicles, the primary planetary gear assembly is detachably connected to the clutch one-way assembly through socket head cap screws with cylindrical heads. An oil drain plug is installed on the outer side wall of the reverse gear planetary gear assembly.

[0012] According to the described automatic transmission for electric vehicles, the transmission shaft is in transmission connection with the reverse gear ring assembly.

[0013] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Brief Description of the Drawings

[0014] The following further illustrates the present utility model in conjunction with the drawings and embodiments;

[0015] Figure 1 It is an internal schematic diagram of an automatic transmission for electric vehicles of the present utility model;

[0016] Figure 2 It is a left-side schematic diagram of an automatic transmission for electric vehicles of the present utility model;

[0017] Figure 3 It is a right-side schematic diagram of an automatic transmission for electric vehicles of the present utility model;

[0018] Figure 4 It is a front-side schematic diagram of an automatic transmission for electric vehicles of the present utility model.

[0019] Legend Explanation:

[0020] 1. Vent plug; 2. Fixed bolt; 3. Cable support; 4. Transmission shaft; 5. Allen screw; 6. Connecting seat; 7. Standard washer; 8. Input assembly; 9. Clutch one-way assembly; 10. Reverse planetary gear assembly; 11. Drain plug; 12. Allen socket head cap screw; 13. Output end assembly; 14. Output shaft spline; 15. Primary planetary gear assembly. Detailed implementation manners

[0021] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Referring to Figures 1-4 , an automatic transmission for an electric vehicle according to an embodiment of the present invention includes: a connecting seat 6. An input assembly 8 is installed on the right side wall of the connecting seat 6. The connecting seat 6 is fixed to the input assembly 8 through an Allen screw 5. A standard washer 7 is installed between the nut of the Allen screw 5 and the connecting seat 6 to improve the sealing performance of the device connection.

[0024] The output end of the input assembly 8 is equipped with a clutch one-way assembly 9. The output end of the clutch one-way assembly 9 is fixedly connected to a transmission shaft 4. A reverse planetary gear assembly 10 is installed on the right side wall of the clutch one-way assembly 9. A reverse gear ring assembly is installed inside the reverse planetary gear assembly 10. The output end of the reverse gear ring assembly is drivingly connected to a primary planetary gear assembly 15. The primary planetary gear assembly 15 is detachably connected to the clutch one-way assembly 9 by an internal hexagonal socket head screw 12. An oil drain plug 11 is installed on the outer side wall of the reverse planetary gear assembly 10. There is a driving connection between the transmission shaft 4 and the reverse gear ring assembly.

[0025] The output end of the primary planetary gear assembly 15 is fixedly connected to an output end assembly 13. Six output shaft splines 14 are provided on the outer side wall of the output shaft of the output end assembly 13, which are common Japanese standard involute splines EXT 18z×1m×20° with the motor connection shaft. The parameters of the output shaft splines 14 are 6×16H7×20H10×4H11. The input and output can select corresponding parameters or accessories according to the usage requirements.

[0026] A fork assembly is installed on the outer side wall of the output end assembly 13. A vent plug 1 is installed on the outer side wall of the fork assembly. A cable bracket 3 is installed between the fork assembly and the clutch one-way assembly 9. The cable bracket 3 is matched with the fork assembly through a fixing bolt 2. The fork assembly is matched with the speed change gear inside the output end assembly 13 for changing the speed ratio.

[0027] Working principle: The transmission will automatically adjust according to the speed from low gear to high gear, and the reverse gear needs to be adjusted in cooperation with the shift lever box; the high gear transmission ratio of the transmission is: 1:1, and the low gear transmission ratio is 4.2:1. The total transmission ratio needs to calculate the rear axle reduction ratio, that is, the high gear total transmission ratio is i 后 : 1, and the low gear transmission ratio is 4.2i 后 : 1; the rated power of the motor matched with the transmission is 7.5KW, and the maximum input speed is ≤3800rpm; about 1.2L of all-season general-purpose oil needs to be injected before the transmission works; the transmission and the rear axle should be connected by a transmission shaft with a telescopic function, and a transmission shaft support should be installed at the connection between the transmission and the transmission shaft; the connection shaft with the motor is a common Japanese standard involute spline EXT 18z×1m×20°, and the parameters of the output shaft splines 14 are 6×16H7×20H10×4H11. The input and output can select corresponding parameters or accessories according to the usage requirements.

[0028] The above has described the embodiments of the present invention in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Various changes can be made without departing from the gist of the present invention within the knowledge scope of those of ordinary skill in the art to which the present invention pertains.

Claims

1. An automatic transmission for an electric vehicle, characterized in that, Including: A connecting seat (6), an input assembly (8) is installed on the right side wall of the connecting seat (6), a clutch one-way assembly (9) is installed at the output end of the input assembly (8), a transmission shaft (4) is fixedly connected to the output end of the clutch one-way assembly (9), a reverse gear planetary gear assembly (10) is installed on the right side wall of the clutch one-way assembly (9), a reverse gear ring assembly is installed inside the reverse gear planetary gear assembly (10), the output end of the reverse gear ring assembly is drivingly connected to a primary planetary gear assembly (15), the output end of the primary planetary gear assembly (15) is fixedly connected to an output end assembly (13), and a shift fork assembly is installed on the outer side wall of the output end assembly (13).

2. The automatic transmission for an electric vehicle according to claim 1, wherein, An air vent plug (1) is installed on the outer side wall of the shift fork assembly.

3. An automatic transmission for an electric vehicle according to claim 1, wherein A cable support (3) is installed between the shift fork assembly and the clutch one-way assembly (9), and the cable support (3) is cooperated with the shift fork assembly through a fixing bolt (2).

4. An automatic transmission for an electric vehicle according to claim 1, characterized in that, Six output shaft splines (14) are arranged on the outer side wall of the output shaft of the output end assembly (13).

5. An automatic transmission for an electric vehicle according to claim 1, wherein The shift fork assembly is cooperated with a speed change gear inside the output end assembly (13).

6. The automatic transmission for an electric vehicle according to claim 1, wherein, The connecting seat (6) is fixed to the input assembly (8) through an internal hexagonal screw (5), and a standard washer (7) is installed between the nut of the internal hexagonal screw (5) and the connecting seat (6).

7. An automatic transmission for an electric vehicle according to claim 1, characterized in that, The primary planetary gear assembly (15) is detachably connected to the clutch one-way assembly (9) through an internal hexagonal socket head cap screw (12), and an oil drain plug (11) is installed on the outer side wall of the reverse gear planetary gear assembly (10).

8. An automatic transmission for an electric vehicle according to claim 1, wherein, The transmission shaft (4) is drivingly connected to the reverse gear ring assembly.

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