Coaxial driving device for vehicle

Abstract

The utility model discloses a coaxial type driving device for a vehicle, which comprises a planet row type speed reducer, the planet row type speed reducer comprises a sun gear, a first gear ring, a second gear ring, a first planet gear, a second planet gear, a third planet gear and a fourth planet gear, the first planet gear is arranged on a first planet carrier and meshed with the sun gear, and the second planet gear is arranged on a second planet carrier and meshed with the third planet gear. The first planet carrier is connected with the first half shaft in a relative rotation resisting mode, the second gear ring is meshed with the fourth planet gear, the second gear ring is connected with the second half shaft in a relative rotation resisting mode, the first gear ring is meshed with the second planet gear and the third planet gear, and the first planet gear and the second planet gear are coaxially arranged and synchronously rotate. And the third planetary gear and the fourth planetary gear are coaxially arranged and synchronously rotate. According to the coaxial type driving device for the vehicle, the functions of speed reduction and differential speed are achieved through the combined type planet row mechanism, the size and the weight can be reduced, and space can be saved when the coaxial type driving device is arranged on the vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive electric drive systems. Specifically, the utility model relates to a coaxial drive device for a vehicle. Background Art

[0002] A patent with the publication number DE 10 2013 215 877 B4 discloses an epicyclic gear transmission for splitting the drive power applied at the power input into a first and a second power output while reducing the output speed to a speed level below the drive speed at the power input. The epicyclic gear transmission has a first planetary stage, which includes a first sun gear, a first planetary gear set, a first planet carrier, and a first ring gear. In addition, the epicyclic gear transmission has a second planetary stage, which includes a second sun gear, a second planetary gear set, a second planet carrier, and a second ring gear. In addition, the epicyclic gear transmission also has a third planetary stage, which includes a third sun gear, a third planetary gear set, a third planet carrier, and a third ring gear. The first sun gear serves as the power input, wherein the first planet carrier is non-rotatably connected to the second sun gear. The second planet carrier is stationary, the first ring gear is non-rotatably connected to the third sun gear, and the third ring gear is non-rotatably connected to the second planet carrier. The first power output is realized via the third planetary stage, and the second power output is realized via the second ring gear of the second planetary stage.

[0003] The epicyclic gear transmission with the above structure has the following defects: the component layout is not compact enough, the overall external contour size is large, and it occupies more layout space.

[0004] There is a desire to provide an improved coaxial drive device for a vehicle, especially regarding how to save space. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a coaxial drive device for a vehicle, with the aim of saving space.

[0006] To achieve the above object, the technical solution adopted by the present utility model is as follows: A coaxial drive device for a vehicle, including a planetary gear type reducer. The planetary gear type reducer includes a sun gear, a first ring gear, a second ring gear, a first planetary gear, a second planetary gear, a third planetary gear and a fourth planetary gear. The first planetary gear is arranged on a first planetary carrier and meshes with the sun gear. The first planetary carrier is connected to a first half shaft in a non-relative rotational manner. The second ring gear meshes with the fourth planetary gear and the second ring gear is connected to a second half shaft in a non-relative rotational manner. The first ring gear meshes with the second planetary gear and the third planetary gear. The first planetary gear and the second planetary gear are coaxially arranged and rotate synchronously. The third planetary gear and the fourth planetary gear are coaxially arranged and rotate synchronously.

[0007] The first planetary gear and the second planetary gear are fixedly connected into one body. The third planetary gear and the fourth planetary gear are fixedly connected into one body.

[0008] The first ring gear is provided with a first inner ring gear tooth meshing with the second planetary gear and a first outer ring gear tooth meshing with the third planetary gear. The first outer ring gear tooth is located outside the first inner ring gear tooth.

[0009] The third planetary gear is installed on a second planetary carrier through a second planetary gear shaft. The second planetary carrier is fixed on the reducer housing. The third planetary gear and the fourth planetary gear are arranged to be rotatable only around the second planetary gear shaft.

[0010] The second ring gear is fixedly connected to a ring gear housing. The ring gear housing is connected to the second half shaft in a non-relative rotational manner.

[0011] The diameter of the second planetary gear is smaller than that of the first planetary gear.

[0012] The coaxial drive device for a vehicle of the present utility model realizes the functions of speed reduction and differential through a compound planetary gear train mechanism, and the size and weight can be reduced, and space can be saved when arranged on the vehicle. Through the integrated structure, the internal parts of the reducer are arranged more compactly, realizing the light weight of the reducer. Description of the Drawings

[0013] This specification includes the following drawings, and the shown contents are respectively:

[0014] Figure 1 is a transmission schematic diagram of the coaxial drive device for a vehicle of the present utility model;

[0015] Figure 2 is a gear meshing diagram of the coaxial drive device for a vehicle of the present utility model;

[0016] The marks in the figure are:

[0017] A, planetary gear train reducer;

[0018] A01, sun gear; A02, first planet carrier; A03, first planetary gear shaft; A04, first planetary gear; A05, second planetary gear;

[0019] A06-1, internal teeth of the first ring gear; A06-2, external teeth of the first ring gear; A07, second planet carrier; A08, second planetary gear shaft; A09, third planetary gear; A10, fourth planetary gear; A11, second ring gear; A12, ring gear housing;

[0020] B01, first half shaft; B02, second half shaft: Detailed implementation manners

[0021] The following is a further detailed description of the specific implementation manners of the present utility model by describing the embodiments with reference to the accompanying drawings, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present utility model and facilitate its implementation.

[0022] It should be noted that in the following implementation manners, the "first", "second", "third" and "fourth" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order, but are only for the convenience of description.

[0023] As Figure 1 and Figure 2 shown, the present utility model provides a coaxial drive device for a vehicle, including a planetary gear train reducer A. The planetary gear train reducer A includes a sun gear A01, a first ring gear, a second ring gear A11, a first planetary gear A04, a second planetary gear A05, a third planetary gear A09 and a fourth planetary gear A10. The first planetary gear A04 is arranged on the first planet carrier A02 and meshes with the sun gear A01. The first planet carrier A02 is connected to the first half shaft B01 in a non-rotatable relative manner. The second ring gear A11 meshes with the fourth planetary gear A10 and the second ring gear A11 is connected to the second half shaft B02 in a non-rotatable relative manner. The first ring gear meshes with the second planetary gear A05 and the third planetary gear. The first planetary gear A04 and the second planetary gear A05 are coaxially arranged and rotate synchronously. The third planetary gear A09 and the fourth planetary gear A10 are coaxially arranged and rotate synchronously. The first half shaft B01 and the second half shaft B02 are coaxially arranged.

[0024] Specifically, as Figure 1 and Figure 2As shown, multiple first planetary gears A04 are provided. The above-mentioned first planetary gears A04 are mounted on the first planet carrier A02 through the first planetary gear shafts A03. The first planet carrier A02 and the first half shaft B01 are connected against relative rotation to output power. The number of the second planetary gears A05 is the same as that of the first planetary gears A04. Each of the first planetary gears A04 is coaxially arranged with one second planetary gear A05, and each of the first planetary gears A04 is fixedly connected to one second planetary gear A05 as a whole. The diameter of the second planetary gear A05 is smaller than that of the first planetary gear A04.

[0025] As Figure 1 shown, the second planetary gear A05 meshes with the first ring gear. The first ring gear has a first ring gear internal tooth A06-1 and a first ring gear external tooth A06-2. The first ring gear external tooth A06-2 is located outside the first ring gear internal tooth A06-1. The above-mentioned first ring gear internal tooth A06-1 meshes with the second planetary gear A05. The above-mentioned first ring gear external tooth A06-2 meshes with multiple third planetary gears A09. The third planetary gears A09 and the fourth planetary gears A10 are mounted on the second planet carrier A07 through the second planetary gear shafts A08. The second planet carrier A07 is fixed to the reducer housing.

[0026] As Figure 1 shown, the number of the third planetary gears A09 is the same as that of the fourth planetary gears A10. Each of the third planetary gears A09 is coaxially arranged with one fourth planetary gear A10, and each of the third planetary gears A09 is fixedly connected to one fourth planetary gear A10 as a whole. The diameter of the third planetary gear A09 is smaller than that of the fourth planetary gear A10.

[0027] As Figure 1 shown, the above-mentioned fourth planetary gear A10 meshes with the second ring gear A11. The second ring gear A11 is fixedly connected to the ring gear housing A12. The ring gear housing A12 rotates synchronously with the second half shaft B02. The second ring gear A11 is connected to the second half shaft B02 against relative rotation through the integral ring gear housing A12 to output power.

[0028] As Figure 1 and Figure 2 shown, an input power is provided to this device from the outside. The external device is usually a motor. The input power first reaches the sun gear A01. The sun gear A01 meshes with multiple first planetary gears A04. The power is transmitted from the sun gear A01 to the first planetary gears A04, realizing the deceleration and torque increase of the power.

[0029] The first planetary gear A04 and the second planetary gear A05 are mounted on the first planet carrier A02 through the first planetary gear shaft A03. The first planetary gear A04 and the second planetary gear A05 are called the first planetary set and have the same rotational speed. Since the first planetary set can both rotate and revolve, the power is split at this moment: a part of the power (set as power 1) is transmitted via the first planet carrier A02, and another part of the power (set as power 2) is transmitted via the second planetary gear A05.

[0030] The above-mentioned power 1 is transmitted via the first planet carrier A02. The first planet carrier A02 is connected to the first half shaft B01 in a rotation-resistant manner, and the power 1 is transmitted by the first half shaft B01 and output as power 1.

[0031] The above-mentioned power 2 reaches the second planetary gear A05. The second planetary gear A05 meshes with the internal teeth of the first ring gear A06-1, and the power 2 is transmitted to the third planetary gear A09 through the first ring gear. At this time, the power 2 has completed speed increase and torque reduction, but the rotation direction is opposite to that of the output power 1. The third planetary gear A09 and the fourth planetary gear A10 are mounted on the second planet carrier A07 through the second planetary gear shaft. The second planet carrier A07 is fixed to the reducer housing. Therefore, the third planetary gear A09 and the fourth planetary gear A10 can only rotate and cannot revolve.

[0032] The above-mentioned fourth planetary gear A10 meshes with the second ring gear A11, and the power 2 realizes torque increase and speed reduction. At this time, the rotation direction of the power 2 is the same as that of the power 1. By adjusting the tooth number speed ratio, the torques and rotational speeds of the power 1 and the power 2 are made the same. The ring gear housing A12 integrated with the second ring gear A11 outputs the power 2. The ring gear housing A12 is non-rotatably connected to the second half shaft B02 to output the power 2 as output power 2.

[0033] For the coaxial drive device for a motor vehicle with the above structure, the reduction and differential mechanisms both adopt the planetary gear train mechanism, and by adjusting the gear tooth numbers and the overall layout, the torques and rotational speeds are equally distributed in the same direction. Compared with the prior art, in the present utility model, some parts are integrated, the power transmission path is optimized, the layout space of the drive device and the whole vehicle is saved, and the purpose of splitting the power and driving in the same direction with the same power is achieved. Only fewer supporting elements are needed, such as the shafts and brackets of the planetary gears. The processing cost of the corresponding components is reduced, and the installation of the drive device is made simple.

[0034] The above has made an exemplary description of the present utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present utility model; or without improvement, the above concept and technical solution of the present utility model are directly applied to other occasions, they are all within the protection scope of the present utility model.

Claims

1. A coaxial drive device for a vehicle, characterized in that: The invention comprises a planetary reducer, which comprises a sun gear, a first ring gear, a second ring gear, a first planetary gear, a second planetary gear, a third planetary gear and a fourth planetary gear. The first planetary gear is arranged on the first planet carrier and meshes with the sun gear. The first planet carrier is connected to the first half shaft to prevent relative rotation. The second ring gear is meshed with the fourth planetary gear and the second ring gear is connected to the second half shaft to prevent relative rotation. The first ring gear is meshed with the second planetary gear and the third planetary gear. The first planetary gear and the second planetary gear are coaxially arranged and rotate synchronously. The third planetary gear and the fourth planetary gear are coaxially arranged and rotate synchronously.

2. The coaxial drive device for a vehicle according to claim 1, characterized in that: The first planetary gear and the second planetary gear are fixedly connected as a whole, and the third planetary gear and the fourth planetary gear are fixedly connected as a whole.

3. The coaxial drive device for a vehicle according to claim 1, characterized in that: The first gear ring is provided with first gear ring internal teeth meshing with the second planetary gears and first gear ring external teeth meshing with the third planetary gears, and the first gear ring external teeth are located outside the first gear ring internal teeth.

4. The coaxial drive device for a vehicle according to any one of claims 1 to 3, characterized in that: The third planetary gear is installed on the second planetary carrier through the second planetary gear shaft, the second planetary carrier is fixed on the reducer housing, and the third planetary gear and the fourth planetary gear are arranged to rotate only around the second planetary gear shaft.

5. The coaxial drive device for a vehicle according to any one of claims 1 to 3, characterized in that: The second ring gear is fixedly connected to the ring gear housing, and the ring gear housing is connected to the second half shaft in a rotationally fixed manner.

6. The coaxial drive device for a vehicle according to any one of claims 1 to 3, characterized in that: The diameter of the second planetary gear is smaller than the diameter of the first planetary gear.

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