Coaxial electric drive system structure

Abstract

The utility model discloses a coaxial electric drive system structure, which relates to the technical field of automobile transmission, and comprises a motor shaft, a differential shaft and an intermediate shaft, the differential shaft and the motor shaft are coaxially arranged, and the intermediate shaft and the motor shaft are arranged in parallel; the wheel shaft comprises a first half shaft and a second half shaft, the first half shaft and the second half shaft are connected through a differential shaft, the motor shaft is arranged outside the first half shaft in a sleeving mode, the motor shaft is in transmission connection with the intermediate shaft through a first-stage gear set, and the intermediate shaft is in transmission connection with the differential shaft through a second-stage gear set. Through the arrangement, the NVH (Noise Vibration and Harshness) performance of the gearbox and the whole vehicle is improved; the size of the gearbox is reduced, the weight of the gearbox is reduced, and part cost and oil consumption of the whole vehicle can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile transmission technology, especially to a coaxial electric drive system structure. BACKGROUND

[0002] The existing electric drive system structure is mostly parallel shaft type, that is, the motor shaft and the output shaft (differential shaft) are arranged in parallel. This arrangement occupies a large space, and the shell of the wrapping part needs to be designed into a long strip shape, which can easily affect the vehicle NVH experience due to poor shell stiffness. The parallel shaft type requires more X-direction space, and a large space can increase the oiling amount and increase the difficulty of lubricating the gear shaft, which is not conducive to the oil control of the gear shaft forward drive / reverse drive. The parallel shaft type has poor expansion direction and is not easy to realize platformization and modularization design. SUMMARY

[0003] The utility model discloses a coaxial electric drive system structure to solve the defects in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A coaxial electric drive system structure, comprising a motor shaft, a differential shaft and an intermediate shaft, the differential shaft is coaxially arranged with the motor shaft, and the intermediate shaft is arranged in parallel with the motor shaft; the wheel shaft comprises a first half shaft and a second half shaft, the first half shaft and the second half shaft are connected through the differential shaft, the motor shaft is sleeved outside the first half shaft, the motor shaft is drivingly connected with the intermediate shaft through a primary gear set, and the intermediate shaft is drivingly connected with the differential shaft through a secondary gear set.

[0006] Further, the intermediate shaft is a two-section structure comprising a first shaft body and a second shaft body, the first shaft body and the second shaft body are connected through a clutch, the motor shaft is two groups, the first motor shaft is sleeved on the first half shaft, and the second motor shaft is sleeved on the second half shaft; the first shaft is drivingly connected with the first motor shaft through a one-gear primary gear set, and the second shaft body is drivingly connected with the second motor shaft through a two-gear primary gear set.

[0007] Further, the first shaft body is drivingly connected with the differential shaft through a secondary gear set.

[0008] Further, the intermediate shaft is a two-section structure comprising a first shaft body and a second shaft body, the motor shaft is two groups, the first motor shaft is sleeved on the first half shaft, and the second motor shaft is sleeved on the second half shaft;

[0009] The first motor shaft is in transmission connection with the first shaft body through a first primary gear set, the first shaft body is in transmission connection with the first half shaft through a first secondary gear set, the second motor shaft is in transmission connection with the second shaft body through a second primary gear set, the second shaft body is in transmission connection with the second half shaft through a second secondary gear set, the first shell is arranged outside the first motor shaft and the gear set to form a first electric drive system, the second shell is arranged outside the second motor shaft and the gear shaft set to form a second electric drive system, and the intermediate bridging shell cover is arranged outside the secondary gear set and connects the first electric drive system and the second electric drive system.

[0010] Further, the first shaft body is connected with the passive wheel in the first secondary gear set, and the second shaft body is connected with the passive wheel in the second secondary gear set.

[0011] Beneficial effects

[0012] Compared with the prior art, the beneficial effects of the utility model lie in that:

[0013] 1. The NVH performance of the gearbox and the whole vehicle is improved.

[0014] 2. The size of the gearbox is reduced, the weight of the gearbox is reduced, the part cost and the fuel consumption of the whole vehicle can be reduced.

[0015] 3. Modular design can be realized to cover different platforms, such as distributed electric drive, multi-gear electric drive, four-wheel drive, etc. DETAILED DESCRIPTION

[0016] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute a limitation to the utility model.

[0017] Figure 1 It is a whole structure schematic view of a basic coaxial electric drive system structure.

[0018] Figure 2 It is a structure schematic view of a coaxial distributed multi-gear coaxial electric drive system structure.

[0019] Figure 3 It is a structure schematic view of a four-wheel drive power arrangement coaxial electric drive system structure.

[0020] Figures 4-6 It is a structure schematic view of a four-wheel drive power arrangement obtained after free combination.

[0021] In the drawing: 1, first half shaft; 2, motor; 3, motor shaft; 4, differential shaft; 5, second half shaft; 6, primary gear set; 7, intermediate shaft; 8, secondary gear set; 9, intermediate bridging shell; 10, clutch. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0023] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0025] In addition, in the description of the present application, the terms used should be understood in a broad sense, and those skilled in the art can understand the specific meaning of the terms according to the actual specific situation. For example, the term "mounting" used in the present application can be defined as detachable fixed mounting or non-detachable fixed mounting, etc.; the terms "setting" and "provided with" used can be defined as contact setting or non-contact setting, etc.; the terms "connection" and "connected" used can be defined as fixed connection or movable connection, etc.; the term "matching" used can be defined as the same or similar in shape or size, etc.; the orientation terms used are defined according to the direction of the drawings or the actual situation and common knowledge.

[0026] Example 1: Refer to Figure 1

[0027] A coaxial electric drive system structure, comprising a motor shaft, a differential shaft and an intermediate shaft 7, the differential shaft is coaxially arranged with the motor shaft, the wheel shaft comprises a first half shaft 1 and a second half shaft 5, the first half shaft 1 and the second half shaft 5 are connected through the differential shaft 4, the motor shaft 3 is sleeved outside the first half shaft 1, the motor shaft 3 is in transmission connection with the intermediate shaft 7 through a first gear set 6, and the intermediate shaft 7 is in transmission connection with the differential shaft through a second gear set 8.

[0028] The motor shaft 3 and the differential output shaft are coaxially arranged, that is, the two shafts are arranged on the same axis; the intermediate shaft 7 is arranged in parallel, that is, the intermediate shaft 7 is parallel to the motor shaft 3 and the differential output shaft, and is respectively meshed with the motor shaft 3 gear and the differential gear to realize two-stage gear transmission; wherein the motor shaft 3 is a hollow shaft, the vehicle half shaft can pass through the motor shaft 3 and be connected with the differential to realize power transmission; this structure is defined as the basic version and is modularly designed.

[0029] Embodiment 2: Refer to Figure 2

[0030] The intermediate shaft 7 is a two-segment structure, including a first shaft body and a second shaft body, the first shaft body and the second shaft body are connected through a clutch 10, the motor shaft is two groups, the first motor shaft is sleeved on the first half shaft 1, and the second motor shaft is sleeved on the second half shaft 5; the first shaft body is in transmission connection with the first motor shaft through a first gear set 6 of one gear, and the second shaft body is in transmission connection with the second motor shaft through a second gear set 6 of two gears.

[0031] Specifically, the first shaft body is in transmission connection with the differential shaft through a two-stage gear set 8.

[0032] The coaxial distributed multi-gear arrangement symmetrically arranges the motors of the basic version, shares one differential, replaces the motor shaft one-stage transmission gear, and adds a clutch 10 for controlling the combination and disengagement of the power of the right motor, so that multi-gear working conditions and large power demand of two motors 2 working at the same time can be realized.

[0033] Embodiment 3: Refer to Figure 3

[0034] The difference from embodiment 1 is that the intermediate shaft 7 is a two-segment structure, including a first shaft body and a second shaft body, the motor shaft is two groups, the first motor shaft is sleeved on the first half shaft 1, and the second motor shaft is sleeved on the second half shaft 5.

[0035] The differential shaft is replaced by an intermediate bridge shell 9, the first motor shaft is in transmission connection with the first shaft body through a first one-stage gear set 6, the first shaft body is in transmission connection with the first half shaft 1 through a first two-stage gear set 8, the second motor shaft is in transmission connection with the second shaft body through a second one-stage gear set 6, the second shaft body is in transmission connection with the second half shaft 5 through a second two-stage gear set 8, and the intermediate bridge shell 9 is covered outside the two-stage gear set 8.

[0036] The first shell is arranged outside the first motor shaft and the gear set to form a first electric drive system, the second shell is arranged outside the second motor shaft and the gear shaft set to form a second electric drive system, and the intermediate bridge shell is covered outside the two-stage gear set to connect the first electric drive system and the second electric drive system.

[0037] Specifically, the first shaft body is connected with the driven gear of the first secondary gear set 8, and the second shaft body is connected with the driven gear of the second secondary gear set 8.

[0038] The coaxial distributed arrangement cancels the differential, and the two base models are connected through the intermediate bridge shell 9 part, so that the two motors can realize power and differential output, realize distributed driving, and can be used for front drive or rear drive.

[0039] The four-wheel drive power arrangement can be obtained by freely combining the schemes in embodiments 1-3: refer to Figures 4-6 ,

[0040] First, two base models are used and arranged at the front wheels and the rear wheels to realize four-wheel drive.

[0041] Second, the base model + coaxial distribution realizes four-wheel drive, and the coaxial distribution can adopt a single gear or a multi-gear structure and is arranged at the front wheels, and the base model is arranged at the rear wheels.

[0042] The free combination of the schemes in embodiments 1-3 can improve the NVH performance of the gearbox and even the whole vehicle, reduce the size and weight of the gearbox, reduce the cost of parts and the fuel consumption of the whole vehicle, and realize modular design to cover different platforms, such as distributed electric drive, multi-gear electric drive, four-wheel drive, etc.

[0043] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A coaxial electric drive system structure, characterized in that, The motor shaft, the differential shaft and the intermediate shaft are coaxially arranged, and the intermediate shaft is arranged in parallel with the motor shaft; the wheel shaft comprises the first half shaft and the second half shaft, the first half shaft and the second half shaft are connected through the differential shaft, the motor shaft is arranged outside the first half shaft, the motor shaft is connected with the intermediate shaft through the first gear set, and the intermediate shaft is connected with the differential shaft through the second gear set.

2. The coaxial electric drive system structure according to claim 1, characterized in that, The intermediate shaft is a two-section structure comprising a first shaft body and a second shaft body, the first shaft body and the second shaft body are connected through a clutch, the motor shaft is two groups, the first motor shaft is arranged on the first half shaft, and the second motor shaft is arranged on the second half shaft; the first shaft is connected with the first motor shaft through the first gear set, and the second shaft body is connected with the second motor shaft through the second gear set.

3. The coaxial electric drive system structure according to claim 2, characterized in that, The first shaft body is connected with the differential shaft through the second gear set.

4. The coaxial electric drive system structure according to claim 1, characterized in that, The intermediate shaft is a two-section structure comprising a first shaft body and a second shaft body, the motor shaft is two groups, the first motor shaft is arranged on the first half shaft, and the second motor shaft is arranged on the second half shaft; The first motor shaft is connected with the first shaft body through the first gear set, the first shaft body is connected with the first half shaft through the second gear set, the second motor shaft is connected with the second shaft body through the second gear set, and the second shaft body is connected with the second half shaft through the second gear set, the first shell is arranged outside the first motor shaft and the gear set to form a first electric drive system, the second shell is arranged outside the second motor shaft and the gear set to form a second electric drive system, and the intermediate bridge shell cover is arranged outside the second gear set to connect the first electric drive system and the second electric drive system.

5. The coaxial electric drive system structure according to claim 4, characterized in that, The first shaft body is connected with the passive wheel in the first second gear set, and the second shaft body is connected with the passive wheel in the second second gear set.

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