Coaxial drive device for a motor vehicle

Abstract

The utility model discloses a coaxial type driving device for a motor 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 carrier. 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 second planet gear and the third planet gear, and the first planet gear and the second planet gear are coaxially arranged and synchronously rotate. According to the coaxial type driving device for the motor 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. And through the integrated structure, all parts in the speed reducer are arranged more compactly, and the light weight of the speed reducer is achieved.

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 motor vehicle. Background Art

[0002] A patent with the publication number DE 10 2013 215 877 B4 discloses an epicyclic gear train 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 train 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 train 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 train 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 train 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] It is desirable to provide an improved coaxial drive device for a motor 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 motor 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 motor vehicle includes a planetary gear train type reducer, the planetary gear train 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 a first half shaft against relative rotation. The second ring gear meshes with the third planetary gear and the second ring gear is connected to a second half shaft against relative rotation. 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.

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

[0008] On the first ring gear, there are first internal teeth of the ring gear that mesh with the second planetary gear and first external teeth of the ring gear that mesh with the third planetary gear. The first external teeth of the ring gear are located outside the first internal teeth of the ring gear.

[0009] 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. The third planetary gear is 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 the diameter of the first planetary gear.

[0012] The coaxial drive device of the present utility model for motor vehicles realizes the functions of speed reduction and differential through a compound planetary gear train mechanism, and the size and weight can be reduced, saving space when arranged on the vehicle. Through the integrated structure, the arrangement of each part inside the reducer is more compact, 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 It is a transmission schematic diagram of the coaxial drive device of the present utility model for motor vehicles;

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

[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; A05, second planetary gear;

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

[0020] B01, first half shaft; B02, second half shaft. Detailed Embodiment

[0021] The following will further describe in detail the specific embodiments of the present invention with reference to the accompanying drawings through the description of the 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 invention 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 of sequence, but are only for the convenience of description.

[0023] As Figure 1 and Figure 2 shown, the present invention provides a coaxial drive device for a motor vehicle, including a planetary gear type reducer A. The planetary gear type reducer A includes a sun gear A01, a first ring gear A07, a second ring gear A10, a first planetary gear A04, a second planetary gear A05 and a third planetary gear A09. The first planetary gear A04 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 A10 meshes with the third planetary gear A09 and the second ring gear A10 is connected to a second half shaft B02 in a non-relative rotational manner. The first ring gear meshes with the second planetary gear A05 and the third planetary gear A09. The first planetary gear A04 and the second planetary gear A05 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 is connected to the first half shaft B01 in a non-relative rotational manner 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 a second planetary gear A05, and each of the first planetary gears A04 is fixedly connected to a second planetary gear A05 integrally. The diameter of the second planetary gear A05 is smaller than that of the first planetary gear A04.

[0025] As Figure 1As shown, the second planetary gear A05 meshes with the first ring gear A07. The first ring gear A07 has an inner tooth A07-1 of the first ring gear and an outer tooth A07-2 of the first ring gear. The outer tooth A07-2 of the first ring gear is located outside the inner tooth A07-1 of the first ring gear. The inner tooth A07-1 of the first ring gear meshes with the second planetary gear A05. The outer tooth A07-2 of the first ring gear meshes with a plurality of third planetary gears A09. The third planetary gears A09 are mounted on the second planetary carrier A06 through the second planetary gear shaft A08, and the second planetary carrier A06 is fixed to the reducer housing.

[0026] As Figure 1 shown, the second ring gear A10 is fixedly connected to the ring gear housing A11. The ring gear housing A11 rotates synchronously with the second half shaft B02. The second ring gear A10 is connected to the second half shaft B02 through the integral ring gear housing A11 in a manner that resists relative rotation to output power.

[0027] 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 speed reduction and torque increase of the power.

[0028] The first planetary gear A04 and the second planetary gear A05 are mounted on the first planetary 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 group and have the same rotational speed. Since the first planetary group can both rotate and revolve, the power is split at this moment: a part of the power (set as power 1) is transmitted through the first planetary carrier A02, and another part of the power (set as power 2) is transmitted through the second planetary gear A05.

[0029] The above-mentioned power 1 is transmitted through the first planetary carrier A02. The first planetary carrier A02 is connected to the first half shaft B01 in a manner that resists relative rotation. The power 1 is transmitted by the first half shaft B01 and is the output power 1.

[0030] The second planetary gear A05 meshes with the first ring gear A07 to transmit the power to the first ring gear A07. The first ring gear A05 also meshes with the third planetary gears A09. The third planetary gears A09 are mounted on the second planetary carrier A06 by the second planetary gear shaft A08, and the second planetary carrier A06 is fixed to the reducer housing.

[0031] Therefore, the third planetary gears A09 can only rotate and cannot revolve. And the rotation direction of the third planetary gears A09 is opposite to the rotation direction when the first planetary carrier A02 transmits the power 1.

[0032] The above-mentioned third planetary gear A09 meshes with the second ring gear A10. At this time, the power 2 is decelerated and the torque is increased, and the rotation direction is the same as that of the power 1. By adjusting the tooth number ratio, the torques and rotational speeds of the power 1 and the power 2 are made the same. The ring gear housing A09 integrated with the second ring gear A08 outputs the power 2. The ring gear housing A09 and the second half shaft B02 are non-rotationally connected to output the power 2, which is the output power 2.

[0033] For the coaxial drive device for a motor vehicle with the above structure, the reduction and differential mechanisms commonly adopt a planetary gear train mechanism, and by adjusting the tooth numbers of the gears and the overall layout, an equal number distribution of the torque and the rotational speed 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 diverting the power and driving in the same direction with the same power is achieved. Only a small number of supporting elements such as the shafts and brackets of the planetary gears are needed. The processing cost of the corresponding components is reduced, and the installation of the drive device is made simple.

[0034] The present utility model has been described exemplarily in conjunction 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-substantive 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 motor 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 second planetary gear and the third planetary gear. The first planetary gear and the second planetary gear are coaxially arranged and rotate synchronously.

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

3. The coaxial drive device for a motor 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. A coaxial drive device for a motor 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. The third planetary gear is configured to rotate only around the second planetary gear shaft.

5. The coaxial drive device for a motor 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 motor 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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