Coaxial electric driving system

Abstract

The utility model relates to the technical field of automobile speed reducers, in particular to a coaxial electric driving system which comprises a motor assembly. The motor assembly is connected with a planet row type speed reducing mechanism; the planet row type speed reducing mechanism is connected with a cylindrical gear differential mechanism; the cylindrical gear differential mechanism is connected with wheels; the planet row type speed reducing mechanism and the cylindrical gear differential mechanism are coaxially arranged; gears in the cylindrical gear differential mechanism adopt the same design of common gear parameters such as tooth number, meshing radius, width and gear pressure angle; the internal structure of the speed reducer can be compact, and the overall structure can be lightened.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile reducers, and in particular to a coaxial electric drive system. Background Art

[0002] With the continuous development of new energy vehicles, the requirements of the reducer assembly of the whole vehicle are getting higher and higher, especially in terms of the reliability, performance, weight, size and volume of the reducer. Although the traditional parallel shaft reducer has high transmission efficiency and good reliability, it does not have advantages in weight, size and volume.

[0003] After searching, the applicant found that the Chinese patent document with publication number 110985639A disclosed a reducer gasket, a reducer and a method for determining the thickness of the reducer gasket on April 10, 2020, which specifically relates to the technical field of transmission equipment; the reducer gasket includes an integrated circular thin sheet and a plurality of connecting through holes arranged on the circular thin sheet; wherein the circular thin sheet is arranged between the planetary carrier and the rigid disk, and is located in the sink formed by the inner ring of the main bearing and the end face of the rigid disk that cooperates with the rigid disk; the circular thin sheet is separated from the cycloid wheel of the reducer; this device cannot solve the above technical problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the existing coaxial electric drive system. Utility Model Content

[0005] The purpose of the utility model is to provide a coaxial electric drive system that can make the internal structure of the reducer compact and lightweight.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a coaxial electric drive system, including a motor assembly; the motor assembly is connected to a planetary gear reduction mechanism; the planetary gear reduction mechanism is connected to a cylindrical gear differential; the cylindrical gear differential is connected to a wheel.

[0007] The motor assembly includes a motor; the motor is connected to a motor shaft; and the motor shaft is connected to the planetary gear reduction mechanism.

[0008] The planetary reduction mechanism includes a sun gear, a first planetary gear and a first planetary carrier; the sun gear is connected to the motor shaft, and the sun gear is meshed with the first planetary gear; the first planetary gear is connected to the first planetary gear shaft; the first planetary carrier is respectively connected to the first planetary gear shaft and the cylindrical gear differential.

[0009] The first planetary gear includes a first-stage gear and a second-stage gear; the first-stage gear is meshed with the sun gear; a ring gear is provided on the reducer housing; and the second-stage gear is meshed with the ring gear.

[0010] The cylindrical gear differential includes a second planet carrier; the second planet carrier and the first planet carrier are an integral structure; the second planet carrier is respectively provided with a second planetary gear and a third planetary gear; the second planetary gear is meshed with the third planetary gear.

[0011] The second planetary carrier is provided with a second planetary gear shaft and a third planetary gear shaft respectively; the second planetary gear is mounted on the second planetary gear shaft; and the third planetary gear is mounted on the third planetary gear shaft.

[0012] The cylindrical gear differential includes a first cylindrical gear and a second cylindrical gear; the second planetary gear is meshed with the first cylindrical gear; and the third planetary gear is meshed with the second cylindrical gear.

[0013] The first cylindrical gear is connected to the left half shaft; the second cylindrical gear is connected to the right half shaft; and both the left half shaft and the right half shaft are connected to the wheels.

[0014] The motor includes a motor stator and a motor rotor; the motor rotor is connected to the motor shaft.

[0015] The beneficial effects of this application are:

[0016] The present application provides a coaxial electric drive system for new energy vehicles, which adopts a coaxial arrangement of a combination of a planetary reduction mechanism and a cylindrical gear differential; and the gears in the cylindrical gear differential adopt a "symmetrical design": that is, the left cylindrical gear of the differential connected to the left wheel power and the right cylindrical gear of the differential connected to the right wheel power are designed with the same parameters, and the same parameters include but are not limited to: commonly used gear parameters such as the number of teeth, meshing radius, width, gear pressure angle, etc.; the structural design of the present application achieves a compact and lightweight internal structure of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a simplified transmission diagram of the coaxial electric drive system.

[0019] Figure 2 This is the gear meshing diagram of this coaxial electric drive system.

[0020] The marks in the above figure are:

[0021] The following are marked in the figure:

[0022] 1. Motor,

[0023] 2. Motor shaft, 201. Motor stator, 202. Motor rotor,

[0024] 3. Sun gear, 301. First planetary gear, 302. First planetary carrier, 303. First planetary gear shaft, 304. First stage gear, 305. Second stage gear,

[0025] 4. Ring gear,

[0026] 5. Second planetary carrier, 501. Second planetary gear, 502. Third planetary gear, 503. Second planetary gear shaft, 504. Third planetary gear shaft,

[0027] 6. First cylindrical gear, 601, second cylindrical gear,

[0028] 7, left half shaft, 701, right half shaft. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific implementation methods of the present invention by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate its implementation.

[0030] Figure 1 The coaxial electric drive system shown includes a motor assembly; the motor assembly is connected to a planetary reduction mechanism; the planetary reduction mechanism is connected to a cylindrical gear differential; and the cylindrical gear differential is connected to wheels.

[0031] The planetary gear reduction mechanism is coaxially arranged with the cylindrical gear differential; and the gears in the cylindrical gear differential are designed with the same commonly used gear parameters such as the number of teeth, meshing radius, width, and gear pressure angle; this can make the internal structure of the reducer compact and achieve lightweight overall structure.

[0032] The motor assembly includes a motor 1; the motor 1 is connected to a motor shaft 2; and the motor shaft 2 is connected to a planetary gear reduction mechanism.

[0033] The motor 1 is powered by a battery to realize electromagnetic conversion; the motor 1 converts electrical energy into mechanical energy to realize the rotation of the motor shaft 2, thereby transmitting kinetic energy to the planetary gear reduction mechanism.

[0034] The planetary reduction mechanism includes a sun gear 3, a first planetary gear 301 and a first planetary carrier 302; the sun gear 3 is connected to the motor shaft 2, and the sun gear 3 is engaged with the first planetary gear 301; the first planetary gear 301 is connected to the first planetary gear shaft 303; the first planetary carrier 302 is respectively connected to the first planetary gear shaft 303 and the planetary reduction mechanism.

[0035] The motor shaft 2 is fixedly connected to the sun gear 3; the sun gear 3 is meshed with the first planetary gear 301, and the power is transmitted from the sun gear 3 to the first planetary gear 301, realizing the first deceleration and torque increase of the power; the first planetary gear 301 is installed on the first planetary carrier 302 through the first planetary gear shaft 303, and the first planetary carrier 302 is connected to the cylindrical gear differential; thus, the power is transmitted from the first planetary carrier 302 of the planetary reduction mechanism to the cylindrical gear differential.

[0036] The first planetary gear 301 includes a first-stage gear 304 and a second-stage gear 305 ; the first-stage gear 304 is meshed with the sun gear 3 ; a ring gear 4 is provided on the reducer housing; and the second-stage gear 305 is meshed with the ring gear 4 .

[0037] The first planetary gear 301 is a stepped gear having two different gears on the left and right. The first-stage gear 304 meshes with the sun gear 3 to achieve the first deceleration and torque increase of the power; the second-stage gear 305 meshes with the ring gear 4 fixed to the housing to achieve the second deceleration and torque increase of the power.

[0038] The cylindrical gear differential includes a second planetary carrier 5 ; the second planetary carrier 5 and the first planetary carrier 302 are integrally formed; the second planetary carrier 5 is provided with a second planetary gear 501 and a third planetary gear 502 ; the second planetary gear 501 is meshed with the third planetary gear 502 .

[0039] The second planetary gears 501 and the third planetary gears 502 are preferably gears of the same specifications; the second planetary carrier 5 and the first planetary carrier 302 are integrally structured; thus, the second planetary carrier 5 can transmit the power of the first planetary carrier 302 and make the internal structure of the accelerator compact; the second planetary carrier 5 serves as the power input of the cylindrical gear differential; the second planetary carrier 5 drives the second planetary gears 501 and the third planetary gears 502 to revolve, and the second planetary gears 501 and the third planetary gears 502 also mesh with each other and rotate relative to each other.

[0040] The second planetary carrier 5 is provided with a second planetary gear shaft 503 and a third planetary gear shaft 504 ; the second planetary gear 501 is mounted on the second planetary gear shaft 503 ; and the third planetary gear 502 is mounted on the third planetary gear shaft 504 .

[0041] The second planetary gear shaft 503 installs the second planetary gear 501 on the second planetary carrier 5; the third planetary gear shaft 504 also installs the third planetary gear 502 on the second planetary carrier 5; the second planetary gear shaft 503 and the third planetary gear shaft 504 can provide installation positions and stable support for the second planetary gear 501 and the third planetary gear 502 respectively.

[0042] The spur gear differential includes a first spur gear 6 and a second spur gear 601 ; the second planetary gear 501 is meshed with the first spur gear 6 ; and the third planetary gear 502 is meshed with the second spur gear 601 .

[0043] The first cylindrical gear 6 and the second cylindrical gear 601 are gears of the same specifications; the second planetary gear 501 and the third planetary gear 502 are respectively engaged with the first cylindrical gear 6 and the second cylindrical gear 601 of the cylindrical gear differential, which can transmit the power of the second planetary gear 501 to the first cylindrical gear 6 and the power of the third planetary gear 502 to the second cylindrical gear 601.

[0044] The first cylindrical gear 6 is connected to the left half shaft 7; the second cylindrical gear 601 is connected to the right half shaft 701; and both the left half shaft 7 and the right half shaft 701 are connected to wheels.

[0045] The first cylindrical gear 6 is fixedly connected to the left half-shaft 7; the second cylindrical gear 601 is fixedly connected to the right half-shaft 701; the first cylindrical gear 6 and the second cylindrical gear 601 serve as power output gears, which can transmit power to the left half-shaft 7 and the right half-shaft 701; the left half-shaft 7 and the right half-shaft 701 are respectively connected to the left and right drive shafts, transmitting power to the drive shaft and wheels to drive the entire vehicle.

[0046] The motor 1 includes a motor stator 201 and a motor rotor 202 ; the motor rotor 202 is connected to the motor shaft 2 .

[0047] The motor stator 201 generates a rotating magnetic field, and the motor rotor 202 induces current under the action of the rotating magnetic field; these induced currents interact with the magnetic field of the motor stator 201, and according to the Lorentz force law, generate forces on the motor rotor 202, thereby forming a torque, which drives the motor rotor 202 to rotate; the motor rotor 202 is connected to the motor shaft 2, so the rotation of the motor rotor 202 drives the motor shaft 2 to rotate.

[0048] The specific workflow of this utility model is as follows:

[0049] The motor 1 is powered by a battery to realize electromagnetic conversion; the motor 1 converts electrical energy into mechanical energy to realize the rotation of the motor shaft 2, thereby transmitting kinetic energy to the planetary gear reduction mechanism.

[0050] The first planetary gear 301 is a stepped gear having two different gears on the left and right. The first-stage gear 304 meshes with the sun gear 3 to achieve the first deceleration and torque increase of the power; the second-stage gear 305 meshes with the ring gear 4 fixed to the housing to achieve the second deceleration and torque increase of the power.

[0051] The first planetary gear 301 is mounted on the first planetary carrier 302 via the first planetary gear shaft 303 , and the first planetary carrier 302 is connected to the cylindrical gear differential; thus, power is transmitted from the first planetary carrier 302 of the planetary gear reduction mechanism to the cylindrical gear differential.

[0052] The second planet carrier 5 is an integral structure with the first planet carrier 302 ; the second planet carrier 5 serves as the power input of the cylindrical gear differential; the second planet carrier 5 drives the second planetary gear 501 and the third planetary gear 502 to revolve, and the second planetary gear 501 and the third planetary gear 502 also mesh with each other and rotate relative to each other.

[0053] The second planetary gear 501 and the third planetary gear 502 are respectively engaged with the first cylindrical gear 6 and the second cylindrical gear 601 of the cylindrical gear differential, so that the power of the second planetary gear 501 can be transmitted to the first cylindrical gear 6 and the power of the third planetary gear 502 can be transmitted to the second cylindrical gear 601.

[0054] The first cylindrical gear 6 is fixedly connected to the left half-shaft 7; the second cylindrical gear 601 is fixedly connected to the right half-shaft 701; the first cylindrical gear 6 and the second cylindrical gear 601 serve as power output gears, which can transmit power to the left half-shaft 7 and the right half-shaft 701; the left half-shaft 7 and the right half-shaft 701 are respectively connected to the left and right drive shafts, transmitting power to the drive shaft and wheels to drive the entire vehicle.

[0055] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. A coaxial electric drive system, characterized in that: The vehicle comprises a motor assembly; the motor assembly is connected to a planetary gear reduction mechanism; the planetary gear reduction mechanism is connected to a cylindrical gear differential; the cylindrical gear differential is connected to a wheel; The motor assembly comprises a motor (1); the motor (1) is connected to a motor shaft (2); the motor shaft (2) is connected to the planetary gear reduction mechanism; The planetary gear reduction mechanism comprises a sun gear (3), a first planetary gear (301) and a first planet carrier (302); the sun gear (3) is connected to the motor shaft (2), and the sun gear (3) is meshed with the first planetary gear (301); the first planetary gear (301) is connected to a first planetary gear shaft (303); and the first planet carrier (302) is respectively connected to the first planetary gear shaft (303) and the cylindrical gear differential.

2. A coaxial electric drive system according to claim 1, characterized in that: The first planetary gear (301) includes a first-stage gear (304) and a second-stage gear (305); the first-stage gear (304) is meshed with the sun gear (3); a gear ring (4) is provided on the reducer housing; and the second-stage gear (305) is meshed with the gear ring (4).

3. A coaxial electric drive system according to claim 2, characterized in that: The cylindrical gear differential comprises a second planetary carrier (5); the second planetary carrier (5) and the first planetary carrier (302) are integrally formed; a second planetary gear (501) and a third planetary gear (502) are respectively provided on the second planetary carrier (5); the second planetary gear (501) and the third planetary gear (502) are meshed.

4. A coaxial electric drive system according to claim 3, characterized in that: The second planetary carrier (5) is provided with a second planetary gear shaft (503) and a third planetary gear shaft (504); the second planetary gear (501) is mounted on the second planetary gear shaft (503); and the third planetary gear (502) is mounted on the third planetary gear shaft (504).

5. A coaxial electric drive system according to claim 4, characterized in that: The cylindrical gear differential comprises a first cylindrical gear (6) and a second cylindrical gear (601); the second planetary gear (501) is meshed with the first cylindrical gear (6); and the third planetary gear (502) is meshed with the second cylindrical gear (601).

6. A coaxial electric drive system according to claim 5, characterized in that: The first cylindrical gear (6) is connected to a left half shaft (7); the second cylindrical gear (601) is connected to a right half shaft (701); and both the left half shaft (7) and the right half shaft (701) are connected to the wheels.

7. A coaxial electric drive system according to any one of claims 4 to 6, characterized in that: The motor (1) comprises a motor stator (201) and a motor rotor (202); the motor rotor (202) is connected to the motor shaft (2).

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