CN218670427U - Coaxial new forms of energy reduction gear - Google Patents
Coaxial new forms of energy reduction gear Download PDFInfo
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- CN218670427U CN218670427U CN202222856882.4U CN202222856882U CN218670427U CN 218670427 U CN218670427 U CN 218670427U CN 202222856882 U CN202222856882 U CN 202222856882U CN 218670427 U CN218670427 U CN 218670427U
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Abstract
The utility model provides a coaxial-type new forms of energy reduction gear, relates to new forms of energy reduction gear technical field for open differential mechanism that often adopts the bevel gear form among the solution prior art leads to coaxial-type reduction gear axial dimension too big easily, and the technical problem of the whole car shake that leads to because of the moment of toppling under the sharp acceleration operating mode. In the coaxial new energy reducer, a motor shell is fixed with a planet row, and the planet row consists of an input sun gear and an output sun gear which are positioned in the middle, three input planet gears which are uniformly distributed in the circumferential direction of the input sun gear and three output planet gears which are uniformly distributed in the circumferential direction of the output sun gear; the power of the output sun gear is transmitted to a differential assembly adopting a parallel-axis cylindrical gear type, the differential shell transmits the power to a planetary gear through a planetary pin shaft, a left planetary gear is meshed with a left half axle gear, a right planetary gear is meshed with the left planetary gear and is meshed with a right half axle gear, and meanwhile, the left half axle gear and the right half axle gear transmit the power to wheels through a driving half axle.
Description
Technical Field
The utility model relates to a new forms of energy reduction gear technical field especially relates to a coaxial-type new forms of energy reduction gear.
Background
At present, most of coaxial new energy reducers in the market are off-axis reducers, a two-stage reduction structure of a fixed-axis cylindrical gear is adopted, a driving reduction driven gear of a second stage is coaxial with a motor shaft, the coaxial reducers are simple in structure and wide in application, but the coaxial reducers are overlarge in size and long in axial dimension, and meanwhile, an offset intermediate shaft can generate extra overturning moment, and the shaking of the whole vehicle is easily caused particularly under the working conditions of vehicle starting and rapid acceleration.
Besides the coaxial scheme of two-stage parallel shafts, coaxial new energy reducers adopting planetary rows are also available in the market, and the scheme of the planetary rows is mainly divided into NGW type and NW type coaxial schemes according to the planetary transmission principle; the transmission speed ratio of the coaxial speed reducer adopting the NGW scheme is smaller due to the limitation of the NGW speed ratio, and the volume of the motor is overlarge due to the increase of the torque of the motor by generally increasing the torque of the driving motor or adopting two-stage planet rows; the use of two NGW planets results in an excessively long axial dimension of the reduction gear and therefore, whatever the form of solution used to compensate for the underspeed of the NGW planets, results in an excessively large and costly final electric drive assembly.
Although the problem that the NGW speed ratio is too small can be solved by adopting the NW type planetary gear, the planetary gear scheme has a complex structure, the adopted duplex planetary gear involves the problem of tooth alignment during processing and assembling, the processing and assembling efficiency is reduced, and the product performance caused by the assembling problem is not ensured due to the complexity and invisibility of the assembling process; meanwhile, the processing technology of the inner gear ring is complex, the manufacturing difficulty is high, and the number of gears required by the scheme is large, so that the cost of the speed reducer is 2 times or even more than 3 times higher than that of the traditional parallel shaft coaxial speed reducer.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coaxial-type new forms of energy reduction gear for solve among the prior art often adopt the open differential mechanism of bevel gear form to lead to coaxial-type reduction gear axial dimensions too big easily, and the technical problem of the whole car shake that leads to because of the moment of toppling under the operating mode with higher speed suddenly.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coaxial new forms of energy reduction gear, comprising: the motor comprises a motor shell, wherein a planet row is fixed on the motor shell and consists of an input sun gear and an output sun gear which are positioned in the middle, three input planet gears which are uniformly distributed on the circumference of the input sun gear and three output planet gears which are uniformly distributed on the circumference of the output sun gear; the power of the output sun gear is transmitted to a differential mechanism assembly, and the differential mechanism assembly adopts a differential mechanism assembly of a parallel shaft cylindrical gear type;
the power of the output sun gear is transmitted to a differential shell, the differential shell transmits the power to a planetary gear through a planetary pin shaft, the left planetary gear is meshed with a left half axle gear, the right planetary gear is meshed with the left planetary gear and meshed with a right half axle gear to realize the differential function of the differential, and meanwhile, the left half axle gear and the right half axle gear transmit the power to wheels through driving half axles.
The motor shaft is fixedly connected inside the rotor, the input sun gear is fixed on the motor shaft, the input sun gear is meshed with the three input planet gears which are uniformly distributed in the circumferential direction, the input planet gears are rigidly connected with the output planet gears, the input planet gears and the output planet gears are supported on the planet pin shaft through needle bearings, the output planet gears are meshed with the output sun gear, supporting bearings are mounted on the output sun gear, and the supporting bearings are fixed on a planet carrier.
Specifically, the differential case is rigidly connected with the output sun gear through a spline, the differential case is provided with a plurality of left planetary pin shafts, the left planetary pin shafts are uniformly distributed along the circumferential direction of the differential case, the left planetary pin shafts are provided with the needle bearing, so that the left planetary gear can freely rotate on the left planetary pin shafts, and the left planetary gear is meshed with the left half axle gear;
the differential mechanism shell is provided with a plurality of right planet pin shafts, the right planet pin shafts are uniformly distributed along the circumferential direction of the differential mechanism shell, the right planet pin shafts are provided with the needle roller bearings, so that a right planet gear can freely rotate on the right planet pin shafts, the right planet gear is meshed with the left planet gear, and the right planet gear is meshed with the right axle shaft gear;
the motor shaft is of a hollow structure, and the left driving half shaft penetrates through the hollow part of the motor shaft, so that the left half shaft gear transmits power to the wheels through the left driving half shaft and keeps coaxial driving.
Further, a deep groove ball bearing is installed on the driving half shaft, and a bearing seat of the deep groove ball bearing is fixed on the motor shell.
Compared with the prior art, coaxial-type new forms of energy reduction gear have following advantage:
in the coaxial new energy reducer provided by the utility model, the differential mechanism using the cylindrical gear has the characteristic of short axial dimension, and the problem of large axial dimension of the current coaxial reducer is solved; the fixed shaft power shunt arrangement for fixing the planet carrier can save an inner gear ring, so that the problem of high manufacturing difficulty of the inner gear ring is avoided, and meanwhile, the coaxial arrangement scheme also solves the problems of large X-direction size and vehicle shaking caused by overturning moment under the condition of rapid acceleration in the traditional parallel shaft coaxial scheme; the problem that the speed ratio of the NGW coaxial planetary row scheme is too small is solved through two-stage transmission of fixed shaft type power splitting.
Drawings
Fig. 1 is a schematic structural diagram of a coaxial new energy reducer provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a planet row in the coaxial new energy reducer provided by the embodiment of the present invention;
fig. 3 is a schematic diagram of a parallel axis differential in a coaxial new energy reducer according to an embodiment of the present invention.
Reference numerals:
1-input sun gear; 2-output sun gear; 3-input planet; 4-output planet wheel; 5-a differential housing; 7-left planetary gear; 8-left side gear; 9-right planetary gear; 10-right half shaft gear; 11-driving the half shaft; 12-a wheel; 13-motor shaft; 14-a rotor; 15-needle bearing; 17-a support bearing; 18-a planet carrier; 19-left planet pin; 20-right planet pin; 21-deep groove ball bearing.
Detailed Description
For convenience of understanding, the coaxial new energy reducer provided by the embodiment of the present invention is described in detail below with reference to the drawings of the specification.
The embodiment of the utility model provides a coaxial-type new forms of energy reduction gear, as shown in fig. 1-3, include: the motor comprises a motor shell, wherein a planet row is fixed on the motor shell and consists of an input sun gear 1 and an output sun gear 2 which are positioned in the middle, three input planet gears 3 which are uniformly distributed on the circumference of the input sun gear 1 and three output planet gears 4 which are uniformly distributed on the circumference of the output sun gear 3; the power of the output sun gear is transmitted to a differential mechanism assembly, and the differential mechanism assembly adopts a parallel shaft cylindrical gear type differential mechanism assembly;
the power of the output sun gear is transmitted to the differential case 5, the differential case 5 transmits the power to the planetary gears through the planetary pin shafts, and the left planetary gear 7 is meshed with the left half-axle gear 8, the right planetary gear 9 is meshed with the left planetary gear 7 and is meshed with the right half-axle gear 10 to realize the differential function of the differential, and simultaneously, the left half-axle gear 8 and the right half-axle gear 10 transmit the power to the wheels 12 through the driving half-axle 11.
Compared with the prior art, the embodiment of the utility model provides a coaxial-type new forms of energy reduction gear have following advantage:
in the coaxial new energy reducer provided by the embodiment of the utility model, the differential mechanism using the cylindrical gear has the characteristic of short axial dimension, and the problem of large axial dimension of the current coaxial reducer is solved; the fixed shaft power shunt arrangement for fixing the planet carrier can save the inner gear ring, avoid the problem of high difficulty in manufacturing the inner gear ring, and simultaneously solve the problems of large X-direction size and whole vehicle shaking caused by overturning moment under the condition of rapid acceleration of the traditional parallel shaft coaxial scheme by the coaxial arrangement scheme; the problem that the speed ratio of the NGW coaxial planetary row scheme is too small is solved through two-stage transmission of fixed shaft type power splitting.
As shown in fig. 1, the motor shaft 13 is fixedly connected inside the rotor 14, and after the motor is powered on, the rotor 14 rotates to drive the motor shaft 13 to rotate, so as to realize the input of vehicle power; moreover, the motor shaft 13 is fixed with the input sun gear 1, the planet carrier 18 is fixed with the reducer housing 5, and the planet carrier 18 is fixed with a planet pin shaft, so that the planet gear can only do rotation of a fixed shaft type and can not do revolution and rotation as the traditional structure; the input sun wheel 1 is simultaneously meshed with three input planet wheels 3 which are uniformly distributed in the circumferential direction so as to carry out power split transmission, and the input planet wheels 3 are rigidly connected with the output planet wheels 4 so as to transmit the power of the primary planet wheels to the secondary planet wheels; the input planetary gear 3 and the output planetary gear 4 are supported on a planetary pin shaft through a needle bearing 15, and the three output planetary gears 4 are engaged with the output sun gear 2 to transmit power to the output sun gear 2; further, a support bearing 17 is attached to the output sun gear 2, and the support bearing 17 is fixed to a carrier 18.
Specifically, as shown in fig. 1, the differential case 5 is rigidly connected to the output sun gear 2 by splines to transmit the power of the output sun gear 2 to the differential case 5; the differential housing 5 is provided with a plurality of left planetary pin shafts 19, the left planetary pin shafts 19 are uniformly distributed along the circumferential direction of the differential housing 5, the left planetary pin shafts 19 are provided with needle roller bearings 15, so that the left planetary gears 7 can freely rotate on the left planetary pin shafts 19, and the left planetary gears 7 are meshed with the left half shaft gear 8, so that power is finally transmitted to the left wheel 14;
the differential housing 5 is assembled with a plurality of right planetary pin shafts 20, the right planetary pin shafts 20 are uniformly distributed along the circumferential direction of the differential housing 5, the right planetary pin shafts 20 are assembled with needle bearings 15, so that the right planetary gear 9 can freely rotate on the right planetary pin shafts 20, meanwhile, the right planetary gear 9 is meshed with the left planetary gear 8, and the right planetary gear 9 is meshed with the right semi-axis gear 10, so that power is finally transmitted to the right wheel 14;
the inside of motor shaft 13 adopts hollow structure, and the left drive semi-axis passes the hollow part of motor shaft 13 to realize that left side gear 8 passes through left drive semi-axis and transmits power to wheel 12 and keep coaxial drive, thereby effectively avoid beating too big in the rotation process because of drive semi-axis 11 overlength.
Further, as shown in fig. 1, a deep groove ball bearing 21 is mounted on the drive half shaft 11, and a bearing housing of the deep groove ball bearing 21 is fixed to the motor housing.
When the normal vehicle runs linearly, the planetary gear only revolves and does not rotate, and the rotating speeds of the two ends of the driving wheel are the same; when a vehicle runs in a turn and road conditions at two ends of wheels are different, the differential needs to realize a differential function, namely the rotating speeds of the wheels at two ends are different, the condition that one side is large and the other side is small can occur, further left and right planetary gears perform autorotation motion, the rotating speed of a rear axle gear after the left planetary gear autorotates is changed, the left planetary gear is meshed with the right planetary gear to drive the right planetary gear to rotate, the right planetary gear is meshed with the right axle gear to finally change the rotating speed of the wheels at the right side, the direction of the change of the rotating speed of the wheels at the right side is finally opposite to that of the left side gear through the participation of the right planetary gear in transmission, and the differential function of the vehicle under special road conditions is finally realized, namely, the motor power is transmitted to the wheels at two sides through the parallel axle differential assembly through the power splitting structure.
To sum up, the coaxial new energy reducer provided by the embodiment of the present invention adopts innovative planetary gear transmission and compact differential assembly, and has the advantages of simple structure, low cost, short axial dimension, and convenient arrangement of the whole vehicle; in a specific implementation process, the power of a motor shaft is transmitted to a sun wheel, the sun wheel is meshed with three planet wheels, and because a planet row is fixed on a shell, the meshing of the sun wheel and the planet wheels is the same as the transmission of a traditional parallel shaft, and the planet wheels do not revolve and rotate as the planet wheels of the planet row in the traditional sense; meanwhile, the power splitting effect can be realized by the planet row, the power of the sun gear is equally split to the three planet gears, and the load of each planet gear is reduced, so that the modulus center distance of the gears can be designed to be very small, and the size of the reducer assembly can be further made to be very small; meanwhile, two-stage coaxial planetary gear transmission is adopted, the power of the first-stage planetary gear is transmitted to the second-stage planetary gear, and the second-stage planetary gear is meshed with the output sun gear, so that the total speed ratio of the speed reducer can be made larger finally, the defect that the speed ratio of the NGW planetary gear is too small is overcome, the structure is simple, the reliability is high, the number of parts is small, and the cost is also very advantageous; finally, the power of the output sun gear is transmitted to the differential assembly, the differential assembly is a parallel-shaft cylindrical gear type differential assembly, and the maximum advantage of the differential assembly is that the axial size is short and the differential assembly is easy to arrange compared with the traditional bevel gear differential.
In other words, the embodiment of the utility model provides a coaxial-type new forms of energy reduction gear mainly has following several advantage:
1. the power dividing structure adopts a novel planet row structure with a fixed planet carrier, and a planet wheel only does not have revolution motion in the rotation motion in the transmission process, so that the characteristic of compact structure of the planet row can be utilized, and the advantage of high reliability and high efficiency of the transmission of the dead axle gear is kept;
2. the power dividing structure adopts a sun gear fixedly connected with a motor shaft, the sun gear is meshed with three planet gears simultaneously in the circumferential direction, and simultaneously adopts a two-stage planet gear structure, three second-stage planet gears are meshed with an output sun gear simultaneously, so that power is output finally;
3. the double-connection planetary gear structure is adopted, the left-end planetary gear is meshed with the sun gear, the right-end planetary gear is meshed with the output sun gear, the total transmission speed ratio is also a product of the speed ratio of the sun gear and the first-stage planetary gear and the speed ratio of the second-stage planetary gear and the output sun gear, the problem that the speed ratio of the current single-stage planetary gear is too small is effectively solved, and the double-connection planetary gear is equivalent to the traditional two-stage planetary gear which is used in series, but the double-stage planetary gear has a simple transmission structure and a small number of parts, and simultaneously avoids the use of an inner gear ring with high manufacturing difficulty;
4. the novel parallel shaft differential assembly has the characteristics of compact structure and short axial dimension, so that the coaxial new energy reducer assembly is shorter in axial dimension and more beneficial to the arrangement of the whole vehicle;
5. the motor shaft adopts hollow structure so that the drive half shaft can pass through the inside of motor, exports power to the wheel, simultaneously in order to prevent that the drive shaft from beating too big, arranges the bearing frame on the motor casing to the support to the drive half shaft is strengthened to the installation deep groove ball bearing.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a coaxial-type new forms of energy reduction gear which characterized in that includes: the motor comprises a motor shell, wherein a planet row is fixed on the motor shell and consists of an input sun gear and an output sun gear which are positioned in the middle, three input planet gears which are uniformly distributed on the circumference of the input sun gear and three output planet gears which are uniformly distributed on the circumference of the output sun gear; the power of the output sun gear is transmitted to a differential assembly, and the differential assembly adopts a differential assembly of a parallel shaft cylindrical gear type;
the power of the output sun gear is transmitted to a differential mechanism shell, the differential mechanism shell transmits the power to a planetary gear through a planetary pin shaft, the left planetary gear is meshed with a left half axle gear, the right planetary gear is meshed with the left planetary gear and is meshed with a right half axle gear so as to realize the differential function of the differential mechanism, and meanwhile, the left half axle gear and the right half axle gear transmit the power to wheels through driving half axles.
2. The coaxial new energy reducer according to claim 1, wherein a motor shaft is fixedly connected inside a rotor, the motor shaft is fixed with the input sun gear, the input sun gear is simultaneously meshed with three input planetary gears which are circumferentially and uniformly distributed, the input planetary gears are rigidly connected with the output planetary gears, the input planetary gears and the output planetary gears are supported on the planetary pin shafts through needle bearings, the three output planetary gears are meshed with the output sun gear, and the output sun gear is provided with a support bearing which is fixed on a planetary carrier.
3. The coaxial new energy reducer according to claim 2, wherein the differential case is rigidly connected to the output sun gear by a spline, the differential case is equipped with a plurality of left planetary pin shafts, and the left planetary pin shafts are uniformly distributed along a circumferential direction of the differential case, the left planetary pin shafts are equipped with the needle bearings, so that the left planetary gear can freely rotate on the left planetary pin shafts, and the left planetary gear is meshed with the left side gear;
the differential mechanism shell is provided with a plurality of right planet pin shafts, the right planet pin shafts are uniformly distributed along the circumferential direction of the differential mechanism shell, the right planet pin shafts are provided with the needle roller bearings, so that a right planet gear can freely rotate on the right planet pin shafts, the right planet gear is meshed with the left planet gear, and the right planet gear is meshed with the right axle shaft gear;
the inside of the motor shaft adopts a hollow structure, and the left driving half shaft penetrates through the hollow part of the motor shaft, so that the left half shaft gear transmits power to the wheels through the left driving half shaft and keeps coaxial driving.
4. The coaxial new energy reducer of claim 3, wherein the drive half shaft is mounted with a deep groove ball bearing, and a bearing seat of the deep groove ball bearing is fixed to the motor housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222856882.4U CN218670427U (en) | 2022-10-28 | 2022-10-28 | Coaxial new forms of energy reduction gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222856882.4U CN218670427U (en) | 2022-10-28 | 2022-10-28 | Coaxial new forms of energy reduction gear |
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| Publication Number | Publication Date |
|---|---|
| CN218670427U true CN218670427U (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222856882.4U Active CN218670427U (en) | 2022-10-28 | 2022-10-28 | Coaxial new forms of energy reduction gear |
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| CN (1) | CN218670427U (en) |
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- 2022-10-28 CN CN202222856882.4U patent/CN218670427U/en active Active
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