Coaxial planetary reducer for electric drive system

Abstract

The utility model discloses a coaxial planetary reducer for an electric driving system, which comprises a speed reduction shell, a sun gear, a planet carrier, a plurality of planet wheel shafts, a fixed gear ring, a differential mechanism and a differential lock are arranged in the speed reduction shell, the sun gear is connected with a main shaft of a driving motor, the planet wheel shafts are rotatably connected onto the planet carrier, and the fixed gear ring is connected with the differential mechanism. A first gear and a second gear are arranged on the planet wheel shaft, the first gear is meshed with the sun gear, the second gear is meshed with the fixed gear ring, the first gear is larger than the second gear, and the differential mechanism is located in the planet carrier and connected with two coaxial output shafts. The differential lock is located between one of the output shafts and the planet carrier, the planet carrier is rotationally connected with the speed reduction shell, the speed reducer is compact in structure, smaller in occupied space and lighter in weight, the differential lock is arranged for locking, and the escape capacity of a vehicle is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of speed reducer, more particularly to a coaxial planetary reducer for electric drive system. BACKGROUND

[0002] The speed reduction mechanism of the current electric drive system has problems such as heavy structure, large space occupation, heavy weight, and inability to realize wheel end differential lock. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiency of prior art, the utility model provides a coaxial planetary reducer for electric drive system, which is compact in structure, occupies less space, is lighter in weight, and is provided with a differential lock to improve the vehicle's ability to escape from trouble.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a coaxial planetary reducer for electric drive system, comprising a speed reduction shell, a sun gear, a planet carrier, a plurality of planetary wheel shafts, a fixed gear ring, a differential and a differential lock are arranged in the speed reduction shell, the sun gear is connected to the main shaft of the driving motor, the planetary wheel shaft is rotatably connected to the planet carrier, the first gear and the second gear are arranged on the planetary wheel shaft, the first gear is engaged with the sun gear, the second gear is engaged with the fixed gear ring, the first gear is larger than the second gear, the differential is located in the planet carrier, the differential is connected to the two coaxial output shafts, the differential lock is located between one of the output shafts and the planet carrier, and the planet carrier is rotatably connected to the speed reduction shell.

[0005] Further, the main shaft of the driving motor is hollow, and the other output shaft passes through the main shaft of the driving motor to connect the differential.

[0006] Further, the differential comprises a fixed shaft, two fixed bevel gears rotatably connected to the fixed shaft, and transmission bevel gears located on the two output shafts, and the transmission bevel gears are engaged with the two fixed bevel gears.

[0007] Further, the differential comprises a locking gear ring located on the planet carrier and a locking tooth sleeve fixedly connected to the output shaft, the locking gear ring is slidably connected to the planet carrier, an electromagnet coil is arranged on the locking tooth sleeve, and after being electrified, the locking gear ring is attracted to move towards the locking tooth sleeve and is engaged with the locking tooth sleeve to realize differential locking.

[0008] Further, the fixed gear ring is located on the inner wall of the fixed and speed reduction shell.

[0009] Compared with the prior art, the utility model discloses the beneficial effects are: drive motor drives sun gear rotation, through the meshing of first gear with sun gear drive planetary gear shaft rotation, again through the meshing of second gear on planetary gear shaft with fixed gear ring drive whole planetary carrier rotation, finally through differential mechanism drive two output shafts power output, realize deceleration drive, improve the torque of output shaft, the compact structure of speed reducer, the smaller space occupation, lighter weight, and with differential lock and stop, improve the ability of vehicle's getting rid of trouble. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structural diagram of the utility model electric drive system coaxial planetary reducer.

[0011] Reference signs: sun gear 1;Planetary carrier 2;Planetary gear shaft 3;Fixed gear ring 4;Differential mechanism 5;Differential lock 6;Drive motor 7;First gear 8;Second gear 9;Output shaft 10. DETAILED DESCRIPTION

[0012] In the description of the utility model, need explanation is, for the orientation word, if there is the term "center", "transverse (X)" "longitudinal (Y)" "vertical (Z)" "length" "width" "thickness" "upper" "lower" "front" "back" "left" "right" "vertical" "horizontal" "top" "bottom" "inner" "outer" "clockwise" "counterclockwise" etc.Indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawing, just for the convenience of narrating the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with specific orientation configuration and operation, can not be understood as limiting the specific protection scope of the utility model.

[0013] In addition, if there is the term "first", "second", just for the description purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of technical features.Therefore, the "first", "second" feature can be explicitly or implicitly include one or more features, and the meaning of "several", "several" in the description of the utility model is two or two or more, unless there is a clear specific limitation.

[0014] REFERENCE Figure 1 Further illustrate the utility model.

[0015] The coaxial planetary reducer for electric drive system comprises a reduction shell (not shown in the drawings), a sun gear 1, a planet carrier 2, a plurality of planet wheel shafts 3, a fixed ring gear 4, a differential 5 and a differential lock 6 arranged in the reduction shell, the sun gear 1 is connected to the main shaft of a driving motor 7, the planet wheel shaft 3 is rotatably connected to the planet carrier 2, the planet wheel shaft 3 is provided with a first gear 8 and a second gear 9, the first gear 8 is engaged with the sun gear 1, the second gear 9 is engaged with the fixed ring gear 4, the first gear 8 is larger than the second gear 9, the differential 5 is arranged in the planet carrier 2, the differential 5 is connected to two coaxial output shafts 10, the differential lock 6 is arranged between one of the output shafts 10 and the planet carrier 2, and the planet carrier 2 is rotatably connected to the reduction shell.

[0016] As shown in Figure 1 , the driving motor 7 drives the sun gear 1 to rotate, the planet wheel shaft 3 is driven to rotate through the first gear 8 engaged with the sun gear 1, the entire planet carrier 2 is driven to rotate through the second gear 9 on the planet wheel shaft 3 engaged with the fixed ring gear 4, and finally the power is output through the two output shafts 10 driven by the differential 5, so as to realize the reduction drive, improve the torque of the output shaft 10, and realize the compact structure of the reducer, smaller space occupation and lighter weight, and the differential lock 6 is locked to improve the escape ability of the vehicle.

[0017] As shown in Figure 1 , preferably in the present example, the main shaft of the driving motor 7 is hollow, and the other output shaft 10 passes through the main shaft of the driving motor 7 to connect the differential 5.

[0018] As shown in Figure 1 , preferably in the present example, the differential 5 comprises a fixed shaft, two fixed bevel gears rotatably connected to the fixed shaft, and a transmission bevel gear arranged on each of the two output shafts 10, and the transmission bevel gear is engaged with the two fixed bevel gears.

[0019] As shown in Figure 1 , preferably in the present example, the differential 5 comprises a locking gear ring arranged on the planet carrier 2 and a locking gear sleeve fixedly connected to the output shaft 10, the locking gear ring is slidably connected to the planet carrier 2, the locking gear sleeve is provided with an electromagnet coil, and after being electrified, the locking gear ring is attracted to move towards the locking gear sleeve and is engaged with the locking gear sleeve, so as to realize the locking of the differential lock 6.

[0020] As shown in Figure 1 , preferably in the present example, the fixed ring gear 4 is arranged on the inner wall of the fixed and reduction shell.

[0021] The above merely is preferred implementation manner of the present application, the protection scope of the present application is not only limited to the above examples, and belongs to the technical scheme under the idea of the present application all belongs to the protection scope of the present application. It should be pointed out that, for ordinary skilled person in the art, under the premise of not departing from the principle of the present application, some improvements and decorations, these improvements and decorations should also be considered as the protection scope of the present application.

Claims

1. A coaxial planetary reducer for an electric drive system, characterized in that: The system includes a reduction housing, within which are housed a sun gear, a planetary carrier, several planetary gear shafts, a fixed ring gear, a differential, and a differential lock. The sun gear is connected to the main shaft of a drive motor. The planetary gear shafts are rotatably connected to the planetary carrier, and each planetary gear shaft has a first gear and a second gear. The first gear meshes with the sun gear, and the second gear meshes with the fixed ring gear. The first gear is larger than the second gear. The differential is located within the planetary carrier and connects to two coaxial output shafts. The differential lock is located between one of the output shafts and the planetary carrier. The planetary carrier is rotatably connected to the reduction housing.

2. The coaxial planetary reducer for an electric drive system according to claim 1, characterized in that: The main shaft of the drive motor is hollow, and another output shaft passes through the main shaft of the drive motor and connects to the differential.

3. The coaxial planetary reducer for an electric drive system according to claim 1, characterized in that: The differential includes a fixed shaft, two fixed bevel gears rotatably connected to the fixed shaft, and transmission bevel gears located on two output shafts respectively, with the transmission bevel gears meshing with the two fixed bevel gears.

4. The coaxial planetary reducer for an electric drive system according to claim 1, characterized in that: The differential includes a locking gear ring located on the planetary carrier and a locking gear sleeve fixedly connected to the output shaft. The locking gear ring is slidably connected to the planetary carrier. An electromagnet coil is provided on the locking gear sleeve. When energized, the locking gear ring is attracted to move toward the locking gear sleeve and engage with the locking gear sleeve to achieve differential locking.

5. The coaxial planetary reducer for an electric drive system according to claim 1, characterized in that: The fixed gear ring is located on the inner wall of the reduction gear housing.

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