Coaxial drive 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 and a third 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 mode, the second gear ring is meshed with the third planet gear, the second gear ring is connected with the second half shaft in a relative rotation mode, the first gear ring is meshed with the first planet gear and the second planet gear, and the second planet gear and the third planet 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 end to a first and a second power output end, while reducing the output speed to a speed level below the drive speed at the power input end. The epicyclic gear transmission has a first planetary stage, which includes a first sun gear, a first set of planetary elements, 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 set of planetary elements, 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 set of planetary elements, a third planet carrier, and a third ring gear. The first sun gear acts as the power input end, wherein the first planet carrier is connected to the second sun gear against relative rotation. The second planet carrier is stationary, the first ring gear is connected to the third sun gear against relative rotation, and the third ring gear is connected to the second planet carrier against relative rotation. The first power output end is realized via the third planetary stage, and the second power output end 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 arrangement of parts is not compact enough, the overall outer contour size is large, and it occupies more layout space.

[0004] There is a need 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 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, and a third planetary gear. The first planetary gear is arranged on a first planet carrier and meshes with the sun gear. The first planet carrier is connected to the first half shaft against relative rotation. The second ring gear meshes with the third planetary gear and the second ring gear is connected to the second half shaft against relative rotation. The first ring gear meshes with the first planetary gear and the second planetary gear. The second planetary gear and the third planetary gear are coaxially arranged and rotate synchronously.

[0007] The second planetary gear and the third planetary gear are fixedly connected as a whole.

[0008] The first ring gear is provided with first internal teeth meshing with the first planetary gear and first external teeth meshing with the second planetary gear. The first external teeth of the first ring gear are located outside the first internal teeth.

[0009] The second planetary gear and the third planetary gear are mounted on the reducer housing through a second planetary gear shaft, and the second planetary gear and the third planetary gear are arranged to be rotatable only around the second planetary gear shaft.

[0010] 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 rotation-resistant manner.

[0011] The diameter of the second planetary gear is smaller than that of the third 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 components inside the reducer are arranged more compactly, realizing the lightweight of the reducer. Description of the Drawings

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

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

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

[0016] The markings in the figure are:

[0017] A, planetary gear train type reducer;

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

[0019] A05, first ring gear; A051, first internal teeth of the first ring gear; A052, first external teeth of the first ring gear; A06, second planetary gear shaft; A071, second planetary gear; A072, third planetary gear; A08, second ring gear; A09, ring gear housing;

[0020] B01, first half shaft; B02, second half shaft. Detailed Description of the Invention

[0021] The following will further describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings through the description of embodiments, 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 embodiments, the "first", "second" and "third" 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 type reducer A. The planetary gear type reducer A includes a sun gear A01, a first ring gear A05, a second ring gear A08, a first planetary gear A04, a second planetary gear A071 and a third planetary gear. The first planetary gear is arranged on a first planetary carrier A02 and meshes with the sun gear A01. The first planetary carrier A02 is connected to a first half shaft B01 in a non-relative rotational manner. The second ring gear A08 meshes with the third planetary gear A072 and the second ring gear A08 is connected to a second half shaft B02 in a non-relative rotational manner. The first ring gear A05 meshes with the first planetary gear A04 and the second planetary gear A071. The second planetary gear A071 and the third planetary gear A072 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 2 shown, a plurality of first planetary gears A04 are provided. The above-mentioned first planetary gears A04 are installed on the first planetary carrier A02 through first planetary gear shafts A03. The first planetary carrier A02 and the first half shaft B01 are connected in a non-relative rotational manner to output power.

[0025] As Figure 1 and Figure 2 shown, the first ring gear A05 has a first ring gear internal tooth A051 and a first ring gear external tooth A052. The first ring gear internal tooth A051 meshes with a plurality of first planetary gears A04. The first ring gear external tooth A052 meshes with a plurality of second planetary gears A071. The first ring gear external tooth A052 is located outside the first ring gear internal tooth A051.

[0026] The above-mentioned second planetary gear A071 and third planetary gear A072 are of a structure fixedly connected into one body. The diameter of the second planetary gear A071 is smaller than the diameter of the third planetary gear A072.

[0027] The second planetary gear A071 and the third planetary gear A072 are fixed to the reducer housing by the second planetary gear shaft A06. The second planetary gear A071 meshes with the external teeth of the first ring gear A052, and the third planetary gear A072 meshes with the second ring gear A08.

[0028] The above-mentioned second ring gear A08 is fixedly connected to the ring gear housing A09. The ring gear housing A09 rotates synchronously with the second half shaft B02. The second ring gear A08 is connected to the second half shaft B02 in a rotation-resistant manner through the integral ring gear housing A09 to output power.

[0029] As Figure 1 and Figure 2 shown, an input power is provided to this device externally. The external device is usually a motor. The input power first reaches the sun gear A01. The sun gear A01 meshes with a plurality of first planetary gears A04. The power is transmitted from the sun gear A01 to the first planetary gears A04, achieving the deceleration and torque increase of the power.

[0030] The first planetary gears A04 are fixed to the first planetary carrier A02 by the first planetary gear shafts A03. Since the first planetary gears A04 can rotate both self - rotatably and revolvably, the power is split at this moment: a part of the power (set as power 1) is transmitted via the first planetary carrier A02, and another part of the power (set as power 2) is transmitted via the first planetary gears A04.

[0031] The above - mentioned power 1 is transmitted via the first planetary carrier A02. The first planetary carrier A02 is connected to the first half shaft B01 in a rotation - resistant manner. The power 1 is transmitted by the first half shaft B01 and is the output power 1.

[0032] The first ring gear A05 has internal teeth of the first ring gear A051, which mesh with the above - mentioned first planetary gears A04. The power 2 reaches the first ring gear A05. The first ring gear A05 also has external teeth of the first ring gear A052, which mesh with the second planetary gear A071. At this time, the power 2 achieves speed increase and torque reduction, but the rotation direction is opposite to that of the power 1 transmitted by the first planetary carrier A02.

[0033] The above - mentioned second planetary gear A071 is fixed to the reducer housing by the second planetary gear shaft A06. Therefore, the second planetary gear A071 can only rotate self - rotatably and cannot revolve. It also has a third planetary gear A072. The second planetary gear A071 and the third planetary gear A072 have the same rotational speed.

[0034] The above-mentioned third planetary gear A072 meshes with the second ring gear A08, achieving the deceleration and torque increase of power 2. At this time, the rotation direction of power 2 is the same as that of power 1. By adjusting the tooth number ratio, the torques and rotational speeds of power 1 and power 2 are made the same. The ring gear housing A09 integrated with the second ring gear A08 outputs power 2. The ring gear housing A09 and the second half shaft B02 are non-rotatably connected to output power 2, which is the output power 2.

[0035] For the coaxial drive device for vehicles with the above structure, the deceleration and differential mechanisms commonly adopt the planetary gear train mechanism, and by adjusting the gear tooth numbers and the overall layout, the equal number distribution of torques and rotational speeds in the same direction is achieved. 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 shunting 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.

[0036] The present utility model has been described exemplarily in combination with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above-mentioned manner. As long as various non-substantial improvements are made by adopting the method concept and technical solution of the present utility model; or without improvement, the above-mentioned 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 and a third planetary gear. The first planetary gear is arranged on a first planet carrier and meshes with the sun gear. The first planet carrier is connected to the first half shaft in a manner that prevents relative rotation. The second ring gear meshes with the third planetary gear and the second ring gear is connected to the second half shaft in a manner that prevents relative rotation. The first ring gear meshes with the first planetary gear and the second planetary gear. The second planetary gear and the third planetary gear are coaxially arranged and rotate synchronously.

2. The coaxial drive device for a vehicle according to claim 1, characterized in that: The second planetary gear and the third planetary gear are fixedly connected to form 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 first planetary gears and first gear ring external teeth meshing with the second 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 second planetary gear and the third planetary gear are mounted on the reducer housing via a second planetary gear shaft, and the second planetary gear and the third planetary gear are configured 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 third planetary gear.

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