Two-gear transmission structure of pure electric vehicle

Abstract

The utility model discloses a two-gear transmission structure of a pure electric vehicle, which comprises a shell, an input shaft, a first-gear driving gear, a second-gear driving gear, an output shaft, a first-gear driven gear and a second-gear driven gear are arranged in the shell, the first-gear driving gear is meshed with the first-gear driven gear, the second-gear driving gear is meshed with the second-gear driven gear, and the second-gear driven gear is meshed with the output shaft. The first-gear driving gear is fixedly connected with the input shaft, a bearing is arranged between the second-gear driving gear and the input shaft to form relative rotation, a bearing is arranged between the first-gear driven gear and the output shaft to form relative rotation, the second-gear driven gear is fixedly connected with the output shaft, and a first clutch device is arranged between the second-gear driving gear and the input shaft. A second clutch device is arranged between the first-gear driven gear and the output shaft, an overrun clutch is arranged between the first-gear driven gear and the second-gear driven gear, one end of the output shaft extends out of the shell to be connected with a driving device, and the output shaft is connected with a load device. Gear shifting is smooth, work is reliable, and the transmission is simpler in structure and lower in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of transmission technology, more particularly to a pure electric vehicle two gear transmission structure. BACKGROUND

[0002] In the field of pure electric vehicle electric drive, the current commonly used transmission structure form mostly adopts single reduction ratio, and a few passenger cars and partial commercial vehicles adopt two gear or multi-gear transmission, basically adopt AT or AMT technology, adopt AMT technology, although simple structure, low cost, but there is power interruption in the process of gear shifting, and AT technology needs to be smooth in the process of gear shifting but the structure is complex and the cost is high. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiency of prior art, the utility model provides a pure electric vehicle two gear transmission structure, which is smooth in gear shifting, reliable in work, simpler in transmission structure and lower in manufacturing cost.

[0004] To achieve the above object, the utility model provides the following technical scheme: a pure electric vehicle two gear transmission structure, including the casing, the casing is provided with input shaft, one gear driving gear, two gear driving gear, output shaft, one gear driven gear and two gear driven gear, one gear driving gear is engaged with one gear driven gear, two gear driving gear is engaged with two gear driven gear, one gear driving gear is fixedly connected with input shaft, bearing is arranged between two gear driving gear and input shaft, and relative rotation is formed, bearing is arranged between one gear driven gear and output shaft, and relative rotation is formed, two gear driven gear is fixedly connected with output shaft, first clutch device is arranged between two gear driving gear and input shaft, second clutch device is arranged between one gear driven gear and output shaft, overrunning clutch is arranged between one gear driven gear and two gear driven gear, one end of output shaft is connected with driving device and stretches out the casing, output shaft is connected with load device, one gear driving gear is smaller than two gear driving gear, and one gear driven gear is larger than two gear driven gear.

[0005] Further, the first clutch device is a wet multi-plate clutch.

[0006] Further, the second clutch device is a synchronizer.

[0007] Further, the first annular groove is arranged on the one gear driven gear, the inner ring of the overrunning clutch is sleeved on the outer circular surface of the first annular groove, the second annular groove is arranged on the two gear driven gear, and the outer ring of the overrunning clutch abuts on the inner circular side surface of the second annular groove.

[0008] Further, the load device is a differential mechanism located in the shell, the output shaft is provided with an output gear, the differential mechanism is provided with a transmission gear, and the transmission gear is engaged with the output gear.

[0009] Compared with the prior art, the beneficial effects of the utility model are that the wet multi-plate clutch, overrunning clutch and synchronizer structure are innovated and organically combined, the two-gear transmission structure of electric drive is realized, the smooth gear shifting is realized, the work is reliable, the transmission structure is simpler, and the manufacturing cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structural schematic view of the two-gear transmission of the utility model pure electric vehicle;

[0011] Figure 2 It is an enlarged view of the internal structure of the two-gear transmission of the utility model pure electric vehicle.

[0012] The figure sign: shell 1, input shaft 2, one gear driving gear 3, two gear driving gear 4, output shaft 5, one gear driven gear 6, two gear driven gear 7, first clutch device 8, second clutch device 9, overrunning clutch 10, differential mechanism 11, output gear 12, transmission gear 13. DETAILED DESCRIPTION

[0013] In the description of the utility model, it needs to be explained that for the orientation words, if the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and cannot be understood as limiting the specific protection scope of the utility model.

[0014] In addition, if the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first", "second" features can be explicitly or implicitly included one or more features, and the meaning of "several", "several" in the description of the utility model is two or more than two, unless otherwise explicitly specified.

[0015] REFERENCE Figure 1 and Figure 2 Further description of the utility model.

[0016] A two-speed transmission structure for a pure electric vehicle includes a housing 1. Inside the housing 1 are an input shaft 2, a first-speed drive gear 3, a second-speed drive gear 4, an output shaft 5, a first-speed driven gear 6, and a second-speed driven gear 7. The first-speed drive gear 3 meshes with the first-speed driven gear 6, and the second-speed drive gear 4 meshes with the second-speed driven gear 7. The first-speed drive gear 3 is fixedly connected to the input shaft 2. A bearing is provided between the second-speed drive gear 4 and the input shaft 2 to allow relative rotation. A bearing is provided between the first-speed driven gear 6 and the output shaft 5 to allow rotation. The second-gear driven gear 7 is fixedly connected to the output shaft 5, and a first clutch device 8 is provided between the second-gear driving gear 4 and the input shaft 2. A second clutch device 9 is provided between the first-gear driven gear 6 and the output shaft 5. An overrunning clutch 10 is provided between the first-gear driven gear 6 and the second-gear driven gear 7. One end of the output shaft 5 extends out of the housing 1 and is connected to the drive device. The output shaft 5 is connected to the load device. The first-gear driving gear 3 is smaller than the second-gear driving gear 4, and the first-gear driven gear 6 is larger than the second-gear driven gear 7.

[0017] Specifically, both the input shaft 2 and the output shaft 5 are rotatably connected to the housing 1, and bearings are provided between them and the housing 1.

[0018] Specifically, the drive device is an electric motor system that provides power for vehicle movement, and the electric motor system can recover power when the vehicle decelerates or goes downhill, etc.

[0019] Specifically, the bearings between the second-gear drive gear 4 and the input shaft 2, and between the first-gear driven gear 6 and the output shaft 5, are all radial needle roller bearings.

[0020] like Figure 1 As shown, first gear is used for low speed and starting conditions of the vehicle. At this time, the first clutch device 8 separates the second gear drive gear 4 from the input shaft 2. Power is transmitted from the input shaft 2 to the first gear drive gear 3 and then to the first gear driven gear 6. Due to the overrunning clutch 10 between the first gear driven gear 6 and the second gear driven gear 7, the first gear driven gear 6 can synchronously drive the second gear driven gear 7. The second gear driven gear 7 then drives the output shaft 5 to output power, which is the first gear power. When the first gear is in power mode, the second clutch device 9 can release or connect the second gear driven gear 7 and the output shaft 5. When released, power is transmitted only by the overrunning clutch 10. When connected, the second gear driven gear 7 can synchronously transmit power to the output shaft 5, so as to effectively reduce the load on the overrunning clutch 10.

[0021] When the vehicle is in first gear and the power output is reduced, such as during deceleration or downhill, the speed of the output shaft 5 will be greater than that of the input shaft 2. At this time, the second clutch device 9 connects the first gear driven gear 6 with the output shaft 5. The output shaft 5 will generate a power difference through the speed difference and transmit it to the input shaft 2 through the first gear driven gear 6 and the first gear driving gear 3, thereby realizing power recovery.

[0022] When the vehicle is in the second gear state and in the working condition of reduced power output such as deceleration or downhill, the power difference returns to the input shaft 2 along the power transmission path when the vehicle is driven in the second gear, so as to realize power recovery.

[0023] When the vehicle is in the second gear state and in the working condition of reduced power output such as deceleration or downhill, the power difference returns to the input shaft 2 along the power transmission path when the vehicle is driven in the second gear, so as to realize power recovery.

[0024] When the vehicle needs to be in reverse gear, the first clutch device 8 releases the second gear driving gear 4 from the input shaft 2, and the second clutch 9 connects the first gear driven gear 6 and the output shaft 5. The input shaft 2 reversely rotates, that is, the power is transmitted to the first gear driven gear 6 through the first gear driving gear 3, and then transmitted to the output shaft 5 through the synchronizer, and the first gear driven gear 6 is reversed.

[0025] In this embodiment, the organic combination of various clutches is adopted to realize the structure of the electrically driven two-gear transmission. The smooth gear shifting is realized, the work is reliable, the transmission structure is simpler, and the manufacturing cost is lower.

[0026] As shown in Figure 1 , preferably in this embodiment, the first clutch device 8 is a wet multi-plate clutch.

[0027] As shown in Figure 1 , preferably in this embodiment, the second clutch device 9 is a synchronizer.

[0028] As shown in Figure 1 , preferably in this embodiment, the first annular groove is arranged on the first gear driven gear 6, the inner ring of the overrunning clutch 10 is sleeved on the outer circular surface of the first annular groove, the second annular groove is arranged on the second gear driven gear 7, and the outer ring of the overrunning clutch 10 abuts on the inner circular side surface of the second annular groove.

[0029] As shown in Figure 1 , preferably in this embodiment, the load device is a differential 11 located in the housing 1, the output gear 12 is arranged on the output shaft 5, the transmission gear 13 is arranged on the differential 11, and the transmission gear 13 is engaged with the output gear 12.

[0030] The above merely is preferred implementation manner of the present application, the protection scope of the present application is not only limited to the above examples, and belongs to the technical scheme under the idea of the present application all belongs to the protection scope of the present application. It should be pointed out that, for ordinary skilled person in the art, under the premise of not departing from the principle of the present application, some improvements and decorations, these improvements and decorations should also be considered as the protection scope of the present application.

Claims

1. A structure of a two-speed transmission for a pure electric vehicle, characterized by: The application relates to a transmission device, which comprises a shell, an input shaft, a first-gear driving gear, a second-gear driving gear, an output shaft, a first-gear driven gear and a second-gear driven gear, the first-gear driving gear is engaged with the first-gear driven gear, the second-gear driving gear is engaged with the second-gear driven gear, the first-gear driving gear is fixedly connected with the input shaft, a bearing is arranged between the second-gear driving gear and the input shaft to form relative rotation, a bearing is arranged between the first-gear driven gear and the output shaft to form relative rotation, the second-gear driven gear is fixedly connected with the output shaft, a first clutch device is arranged between the second-gear driving gear and the input shaft, a second clutch device is arranged between the first-gear driven gear and the output shaft, an overrunning clutch is arranged between the first-gear driven gear and the second-gear driven gear, one end of the output shaft extends out of the shell to be connected with a driving device, the output shaft is connected with a load device, the first-gear driving gear is smaller than the second-gear driving gear, and the first-gear driven gear is larger than the second-gear driven gear.

2. The structure of a two-speed transmission for a pure electric vehicle according to claim 1, characterized in that: The first clutch device is a wet multi-plate clutch.

3. The structure of a two-speed transmission for a pure electric vehicle according to claim 1, characterized in that: The second clutch device is a synchronizer.

4. The structure of a two-speed transmission for a pure electric vehicle according to claim 1, characterized in that: A first annular groove is arranged on the first-gear driven gear, an inner ring of the overrunning clutch is sleeved on an outer circular surface of the first annular groove, a second annular groove is arranged on the second-gear driven gear, and an outer ring of the overrunning clutch abuts against an inner circular side surface of the second annular groove.

5. The structure of a two-speed transmission for a pure electric vehicle according to claim 1, characterized in that: The load device is a differential mechanism arranged in the shell, an output gear is arranged on the output shaft, a transmission gear is arranged on the differential mechanism, and the transmission gear is engaged with the output gear.

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