CN113137456A - Pure electric high-speed reduction gearbox - Google Patents

Pure electric high-speed reduction gearbox Download PDF

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Publication number
CN113137456A
CN113137456A CN202110539826.5A CN202110539826A CN113137456A CN 113137456 A CN113137456 A CN 113137456A CN 202110539826 A CN202110539826 A CN 202110539826A CN 113137456 A CN113137456 A CN 113137456A
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China
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shaft
planet carrier
sun wheel
gear
shell
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Chinese (zh)
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杨岳潜
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • B60K17/165—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing provided between independent half axles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H57/082—Planet carriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02086—Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H2057/085—Bearings for orbital gears

Abstract

The invention discloses a pure electric high-speed reduction box, which comprises a primary planetary transmission system and a primary parallel shaft transmission system which are arranged in a shell, wherein the input end of the planetary transmission system is connected with a driving motor, the output end of the planetary transmission system is fixed with a small gear of a parallel shaft system, and a large gear of the parallel shaft system is connected with a differential mechanism; the planetary transmission system comprises an input sun wheel shaft, a planet carrier, a sun wheel, a gear ring and planet wheels, wherein the center of the sun wheel is connected to the input sun wheel shaft, the planet wheels are arranged on the planet carrier and are respectively meshed with the gear ring and the sun wheel, and two ends of the input sun wheel shaft are respectively rotatably connected with one side of the shell and the planet carrier; the output end of the planet carrier is connected with a planet carrier output shaft, and the planet carrier output shaft is rotatably connected with the other side of the shell. The invention has the advantages of compact structure, large reduction ratio, small overall volume, small occupied space, light weight and flexible arrangement, realizes integration with the motor to different degrees, and is suitable for matching with the ultra-high speed motor.

Description

Pure electric high-speed reduction gearbox
Technical Field
The invention relates to the field of pure electric drive of new energy vehicles, in particular to a pure electric high-speed reduction gearbox.
Background
At present, pure electric high-speed reduction boxes used in the new energy pure electric market almost adopt a two-stage parallel shaft structure, are matched with a driving motor below 18,000rpm, and have transmission generally less than 14 and hardly more than 18. With the advancement of technology and the space requirement of vehicles, the trend toward higher speeds and miniaturization of drive motors is becoming more and more significant, and on-vehicle drive motors exceeding 20,000 and even reaching 30,000rpm are fully anticipated.
At such high speeds, it is expected that the reduction gearbox ratio will typically reach 20, even more than 25. Under the condition of the high speed ratio, the space size and the weight of a reduction gearbox of the conventional two-stage parallel shaft system structure are both increased sharply, the structure of the two-stage parallel shaft system is changed into a three-stage parallel shaft system structure, the reduction of the weight is possibly beneficial, but the space size is increased due to structural arrangement. Moreover, upgrading the parallel shafting structure from a first gear to a second gear reduction box is relatively complex.
Disclosure of Invention
The invention aims to provide a pure electric high-speed reduction box which has the advantages of larger speed ratio, smaller space size requirement, lighter weight, flexible arrangement and easier technical upgrade.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a pure electric high-speed reduction gearbox, which comprises a planetary transmission system, wherein the input end of the planetary transmission system is connected with a driving motor, the output end of the planetary transmission system is connected with a differential mechanism, and the planetary transmission system is arranged in a shell;
the planetary transmission system comprises an input sun wheel shaft, a planet carrier, a sun wheel, a gear ring and planet wheels, wherein the center of the sun wheel is connected to the input sun wheel shaft, the planet wheels are mounted on the planet carrier through planet wheel bearings, the outer peripheries of the planet wheels are meshed with the gear ring, the inner peripheries of the planet wheels are meshed with the sun wheel, and the gear ring is connected to the shell in a positioning mode; one end of the input sun wheel shaft is rotatably connected with one side of the shell, and the other end of the input sun wheel shaft is rotatably connected with the planet carrier; the output end of the planet carrier is connected with a planet carrier output shaft, and the planet carrier output shaft is rotatably connected with the other side of the shell; the input end of the input sun gear shaft is connected with the rotating shaft of the driving motor through a spline or the rotating shaft of the driving motor is replaced.
Preferably, one end of the input sun wheel shaft is connected with one side of the shell through a sun wheel front bearing, and the other end of the input sun wheel shaft is connected with the planet carrier through a sun wheel rear bearing; the planet carrier output shaft is connected with the other side of the shell through a planet carrier rear bearing, and the planet carrier is close to one side of the driving motor and is connected with the shell through a planet carrier front bearing.
Preferably, a leakage-proof high-speed oil seal is arranged between the shell and the input sun wheel shaft, and the high-speed oil seal is positioned between the front bearing of the sun wheel and the driving motor.
Preferably, when the driving motor is directly connected with the planet carrier in a transmission manner, the output shaft of the driving motor is directly converted into the input sun gear shaft.
Preferably, the parking gear is integrated on the planet carrier output shaft or at the front part of the planet carrier.
Preferably, the differential is connected with a secondary driven gear, the output shaft of the planet carrier is connected with a secondary driving gear, the secondary driving gear is meshed with the secondary driven gear, and the differential is provided with a left output half shaft and a right output half shaft; the differential is connected in the shell through a differential front bearing and a differential rear bearing.
Preferably, the rotation speed and the torque of the left output half shaft and the right output half shaft are the same when the left output half shaft and the right output half shaft are in straight running; the two rotate at different speeds during turning.
Preferably, an oil cooler assembly for improving the lubricating and cooling performance of each gear pair and the bearing is arranged in the shell.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention discloses a pure electric high-speed reduction gearbox, which comprises a planetary transmission system, wherein the input end of the planetary transmission system is connected with a driving motor, the output end of the planetary transmission system is connected with a differential mechanism, and the planetary transmission system is arranged in a shell; the planetary transmission system comprises an input sun wheel shaft, a planet carrier, a sun wheel, a gear ring and a planet wheel, and the size and the occupied space of the shell are reduced while high-speed driving is realized through different connection combinations. The method specifically comprises the following aspects:
firstly), the invention can be suitable for a high-speed driving motor, particularly a driving motor with the speed of more than 20,000rpm, the speed ratio of more than 25 can be easily achieved only by two-stage speed reduction, and the invention is particularly suitable for matching with a super-high-speed motor when a vehicle driven by the motor is used;
and secondly), the space size of the reduction box is smaller. For a reduction gearbox adopting a parallel shafting technology, if the speed ratio of the reduction gearbox is larger, the diameter of a driven wheel of each stage of gear pair is also larger, and therefore the space requirement of the gearbox is large. The planetary transmission system is utilized, so that the size of the gear box is effectively reduced;
third) the weight of the reduction box is smaller, the invention adopts the planetary transmission system, the transmission chain is shorter than the reduction box of the three-level parallel shafting with the same speed ratio, the diameter of the gear is smaller than the reduction box of the two-level parallel shafting with the same speed ratio, therefore, the invention can make the weight of the reduction box lighter;
fourthly) the efficiency of the reduction gearbox is improved, and the invention has smaller space size and can reduce the friction loss of a rotating part; the invention has smaller weight and thus smaller moment of inertia, so that the energy requirement of the rotating member is reduced; the efficiency of the reduction gearbox is improved;
fifthly), the arrangement is flexible, and integration with the motor in different degrees can be realized; the whole planetary system can be integrated with the motor, and the integrated motor is output by the planetary frame, so that a high-speed input shaft oil seal and a high-speed bearing can be saved, and the serialization and modularization of products can be conveniently realized; an electric bridge with double motors and double reduction boxes can be constructed, so that a differential mechanism part is omitted, and the requirements of the whole vehicle on different rotating speeds and torques of wheels on two sides are met;
sixthly), the centralized heat management is facilitated, and the heat efficiency of the whole vehicle is improved. The invention adopts the cooler component to carry out heat management on the lubricating oil, and is convenient for a user to carry out centralized heat management on the motor, the controller (or the inverter) and the reduction gearbox, thereby improving the heat efficiency of the whole vehicle.
In general, the invention has the advantages of large reduction ratio, compact structure, small integral volume, small occupied space, light weight and flexible arrangement, can realize integration with the motor to different degrees, and is suitable for matching with the super-high-speed motor.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a transmission schematic diagram of a pure electric high-speed reduction gearbox of the invention;
FIG. 2 is a schematic structural diagram of the pure electric high-speed reduction gearbox of the invention;
FIG. 3 is a driving schematic diagram of the motor rotor shaft integrated sun gear shaft of the present invention;
FIG. 4 is a schematic diagram of the transmission of the motor integrated planetary gear train of the present invention;
FIG. 5 is a transmission schematic diagram of the radial integrated parking gear of the planet carrier of the present invention;
FIG. 6 is a transmission schematic diagram of the axially integrated parking gear of the planet carrier of the present invention;
FIG. 7 is a schematic diagram of the transmission of the double motors and the double reduction boxes of the present invention;
description of reference numerals: 1. a sun shaft is input; 2. high-speed oil sealing; 3. a sun shaft front bearing; 4. a planet carrier front bearing; 5. a housing; 6. a planet carrier; 7. a sun gear; 8. a ring gear; 9. a left output half shaft; 10. a differential mechanism; 11. a differential front bearing; 12. a sun gear rear bearing; 13. a differential rear bearing; 14. a right output half shaft; 15. a parking gear; 16. a secondary driven tooth; 17. a secondary driving tooth; 18. a planet wheel; 19. a planet wheel bearing; 20. a planet carrier rear bearing; 21. an oil cooler assembly; 22. a drive motor;
6-1, the front part of the planet carrier; 6-2 and a planet carrier output shaft.
Detailed Description
As shown in fig. 1-7, a pure electric high-speed reduction gearbox comprises a planetary transmission system, wherein the input end of the planetary transmission system is connected with a driving motor 22, the output end of the planetary transmission system is connected with a differential 10, and the planetary transmission system is arranged in a shell 5; the planetary transmission system comprises a primary planetary transmission system and a primary parallel shaft transmission system, wherein the output end of the planetary transmission system is connected with the parallel shaft transmission system; the planetary transmission system comprises an input sun wheel shaft 1, a planet carrier 6, a sun wheel 7, a gear ring 8 and planet wheels 18, wherein the center of the sun wheel 7 is connected to the input sun wheel shaft 1, a plurality of planet wheels 18 are arranged on the planet carrier 6 through planet wheel bearings 19, the outer peripheries of the planet wheels 18 are meshed with the gear ring 8, the inner peripheries of the planet wheels 18 are meshed with the sun wheel 7, and the gear ring 8 is fixedly connected to the shell 5; one end of the input sun wheel shaft 1 is rotatably connected with one side of the shell 5, and the other end of the input sun wheel shaft 1 is rotatably connected with the planet carrier 6; the output end of the planet carrier 6 is connected with a planet carrier output shaft 6-2, and the planet carrier output shaft 6-2 is rotatably connected with the other side of the shell 5; the input end of the input sun gear shaft 1 is connected with the rotating shaft of the driving motor 22 through a spline or the rotating shaft of the driving motor 22 is replaced.
Specifically, one end of the input sun gear shaft 1 is connected with one side of the shell 5 through a sun gear front bearing 3, and the other end of the input sun gear shaft 1 is connected with the planet carrier 6 through a sun gear rear bearing 12; the planet carrier output shaft 6-2 is connected with the other side of the shell 5 through a planet carrier rear bearing 20, and one side of the planet carrier 6, which is close to the driving motor 22, is connected with the shell 5 through a planet carrier front bearing 4.
Input of driving motor power
The power of the drive motor is characterized here by the rotational speed and torque of the rotating shaft, and is engineered with the general formula:
Figure BDA0003071244100000051
to express the relationship between the three.
Wherein: p is motor power (Kw), n is motor speed (rpm), and T is torque (Nm).
Specifically, the rotating shaft of the driving motor 22 is connected with the input shaft of the high-speed reduction gearbox, namely the input sun wheel shaft 1, through a pair of splines, so that the rotating speed and the torque of the driving motor are transmitted to the reduction gearbox through the splines. In order to prevent the lubricating oil in the reduction gearbox from leaking along the input sun wheel shaft 1, a high-speed oil seal 2 is arranged between the shell 5 and the input sun wheel shaft 1, and the high-speed oil seal 2 is positioned between the sun wheel front bearing 3 and the driving motor 22; in order to make the sun wheel shaft 1 operate stably, a sun wheel shaft front bearing 3 and a sun wheel rear bearing 12 are respectively arranged on the shell 5 and the planet carrier 6. Unlike the floating load balancing function of a common planetary system, the rear bearing 12 of the sun gear of the invention mainly plays a role of guiding and secondarily supports the sun gear shaft 1.
Thus, the power of the driving motor 22 is input into the high-speed reduction gearbox of the invention through the input of the sun gear shaft 1.
For the power input part, the following applications are specifically classified:
1) as shown in fig. 2, when the precision of the mating spline of the motor rotating shaft and the input sun gear shaft 1 is improved, the sun gear front bearing 3 supporting the sun gear shaft 1 can be eliminated, and the sun gear rear bearing 12 mainly plays a role in guiding, so that the connection can reduce parts and save cost.
2) As shown in fig. 3, the input sun gear shaft 1 and the rotating shaft of the driving motor 22 are further integrated into a shaft, and the sun gear front bearing 3 can be directly eliminated, so that the integration has the advantages of effectively reducing the axial space size of the whole bridge system (the motor and the reduction gearbox), reducing parts and saving cost.
3) On the basis of the above 2), when the cooling of the motor rotor is integrated with the cooling system of the oil cooler assembly 21 of the reduction gearbox, the high-speed oil seal 2 can be further eliminated; the benefits of such integration are: 1) the thermal efficiency of the system is improved; 2) reducing the spatial size of the bridge system; 3) and system parts are reduced, and the cost is saved.
4) Based on the above 3), the whole planetary system is further integrated with a driving motor, as shown in the attached figure 4, and the power input part of the reduction gearbox is changed from the sun gear shaft 1 to the planet carrier 6. The benefits of such integration are: 1) the thermal efficiency of the system is improved; 2) reducing the spatial size of the bridge system; 3) parts are reduced, and the cost is saved; 4) the design, manufacture and assembly difficulty of the reduction gearbox is reduced, and the platformization and modularization of products are facilitated.
Second, conversion of power (rotating speed and torque) by high-speed reduction box
After the low-torque high-speed power of the driving motor enters the high-speed reduction box through the input sun wheel shaft 1, the input sun wheel shaft 1 transmits corresponding rotating speed and torque to the sun wheel 7 under the support of the sun wheel front bearing 3 and the sun wheel rear bearing 12; the sun gear 7 is meshed with the planet gears 18, the planet gears 18 are meshed with the gear ring 8, and the gear ring 8 is fixedly connected to the shell 5, so that the rotation of the sun gear 7 pushes the rotation of the planet gears 18 and the planet carrier 6, the planet gears 18 revolve with the planet carrier 6 besides meshing and rotating with the sun gear 7, and at the moment, the power (rotating speed and torque) of the planetary transmission system (comprising the sun gear 7, the planet carrier 6, the planet gears 18, the gear ring 8 and the planet gear bearing 19) is output through the planet carrier 6. The power of the drive motor 22 is thus subjected to a one-stage conversion by the high-speed reduction gearbox via the input to the sun gear shaft 1 to the output of the planet carrier 6, with a reduced rotational speed and a correspondingly increased torque, with a certain loss in total power.
The relationship between the rotational speed of the sun gear 7 and the rotational speed of the carrier 6 is determined by the following formula:
Figure BDA0003071244100000071
in the formula, ncThe rotational speed, n, of the planet carrier 6sIs the rotational speed, z, of the sun wheel 7sNumber of teeth of sun gear 7, zrThe number of teeth of the ring gear 8.
The power is continuously transmitted to the secondary driving tooth 17 through the planet carrier 6, and the secondary driving tooth 17 transmits the power to the secondary driven tooth 16 fixedly connected with the differential 10 through gear meshing.
The relationship between the rotating speeds of the secondary driven teeth 16 and the secondary driving teeth 17 is as follows:
Figure BDA0003071244100000072
in the formula, nwThe rotational speed of the secondary driven teeth 16, npIs the rotational speed, z, of the secondary driving tooth 17pIs the number of teeth, Z, of the secondary driving tooth 17wThe number of teeth of the secondary driven tooth 16.
The loss of power is ignored during engineering calculation, and the torque obtained at each stage can be obtained according to the relation among the power, the rotating speed and the torque.
Therefore, the invention completes the power conversion of the driving motor in the high-speed reduction box, and outputs the converted power according to the requirement of the whole vehicle in the next step.
In particular with regard to the parking gear 15, this is not necessary for power conversion, but is an auxiliary safety element required for the entire vehicle. The parking gear 15 is integrally connected to the planet carrier output shaft 6-2 or the planet carrier front part 6-1. When the parking gear 15 is fixedly connected with the planet carrier output shaft 6-2 of the planet carrier 6, the higher stress caused by fixedly connecting the parking gear 15 with the shell of the differential 10 by the traditional gear box is avoided, and the size of the parking gear is reduced; the potential dynamics problems that may arise from attaching the parking gear to the high speed input shaft are also avoided.
For the power conversion part, the following applications are specifically included:
as shown in FIG. 5, the parking gear 15 is radially integrated at the front part 6-1 of the planet carrier, so that the axial size of the reduction gearbox can be reduced by the integration;
as shown in fig. 6, the planet carrier output shaft 6-2 of the planet carrier 6 is axially integrated with the parking gear, so that the integration can reduce the axial size and the radial size of the reduction gearbox;
the above two applications are reasonably selected according to the requirements of size and structural stress.
Output of power (rotating speed and torque) by high-speed reduction box
A secondary driven gear 16 is connected to the differential 10, a secondary driving gear 17 is connected to the planet carrier output shaft 6-2, the secondary driving gear 17 is meshed with the secondary driven gear 16, and a left output half shaft 9 and a right output half shaft 14 are symmetrically arranged on the differential 10; the differential 10 is connected within the housing 5 by a differential front bearing 11 and a differential rear bearing 13.
After the conversion of the power of the driving motor is completed, the high-speed reduction box distributes the power under the requirement of the running condition of the whole vehicle, and the rotating speed and the torque of the high-speed reduction box are respectively output from the left output half shaft 9 and the right output half shaft 14 through the differential mechanism 10. When straight running is required, the rotating speed and the torque of the left output half shaft 9 and the right output half shaft 14 are the same; when turning is required, the rotation speeds of the two are different.
After the vehicle stops running, particularly on a sloping road surface, the parking gear 15 is usually locked to prevent an unexpected vehicle slip.
In addition, an oil cooler assembly 21 for improving lubrication and cooling of the gear pairs and bearings is provided in the housing 5. Compared with splash lubrication, the invention can filter the lubricating oil and quantitatively distribute the lubricating oil through the nozzles due to the adoption of the cooler assembly, thus improving the running condition of the gear and the bearing and prolonging the service life of the gear and the bearing, in particular, the working medium of the oil cooler can heat the lubricating oil in the gear box (when the whole vehicle is cold started at low temperature) or cool the lubricating oil (when the gear box runs to generate heat) according to the requirement, and the whole vehicle is convenient to intensively manage the heat requirement (heating or cooling) of the gear box, the motor and the controller thereof, thereby improving the heat efficiency of the whole vehicle.
As shown in fig. 7, one application of the present invention is a dual motor dual reduction gearbox configuration. The benefits of this application are: 1) the structure is compact, the integration level is high, and comprehensive heat management can be realized; 2) the differential can be cancelled, and the production cost of the reduction gearbox is reduced; 3) when the vehicle has inconsistent requirements on the rotating speed and the torque of the wheels on the two sides, if turning or off-road is needed, the different rotating speeds and the torques required by the wheels on the two sides of the vehicle are directly controlled by respective driving motors, so that the safety and the comfort are further improved.
The specific application examples of the invention are as follows:
as shown in fig. 2, the specific embodiment: the high speed reduction gearbox shows the main elements of power transmission, with an input speed of 30,000rpm, an output speed of 1,152.6rpm, and a total speed ratio of 26.03.
The input sun gear shaft 1 is provided with a sun gear shaft front bearing 3, the number of teeth of the sun gear 7 is 23, the total number of planet gears 18 is 49, the number of teeth of the planet gears 8 is 121, the planet carrier front bearing 4 and the planet carrier rear bearing 20 are arranged on the planet carrier 6, the secondary driving gear 17 fixedly connected with the planet carrier 6 is 19, the secondary driven gear 16 meshed with the secondary driving gear 17 is 79, and the output end is provided with a differential front bearing 11 and a differential rear bearing 13.
From the above formula, the speed ratio of the first stage planetary system is (23+ 121)/23-6.26, and the speed ratio of the second stage parallel shafting is 79/19-4.158, so the total speed ratio of the second stage reduction gearbox is 6.26-4.158-26.03.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (8)

1. A pure electric high-speed reduction box is characterized in that: the planetary transmission system is characterized by comprising a planetary transmission system, wherein the input end of the planetary transmission system is connected with a driving motor (22), the output end of the planetary transmission system is connected with a differential (10), and the planetary transmission system is arranged in a shell (5);
the planetary transmission system comprises an input sun wheel shaft (1), a planet carrier (6), a sun wheel (7), a gear ring (8) and planet wheels (18), wherein the center of the sun wheel (7) is connected to the input sun wheel shaft (1), a plurality of planet wheels (18) are arranged on the planet carrier (6) through planet wheel bearings (19), the outer periphery of each planet wheel (18) is meshed with the gear ring (8), the inner periphery of each planet wheel (18) is meshed with the sun wheel (7), and the gear ring (8) is connected to the shell (5) in a positioning mode; one end of the input sun wheel shaft (1) is rotatably connected with one side of the shell (5), and the other end of the input sun wheel shaft (1) is rotatably connected with the planet carrier (6); the output end of the planet carrier (6) is connected with a planet carrier output shaft (6-2), and the planet carrier output shaft (6-2) is rotatably connected with the other side of the shell (5);
the input end of the input sun gear shaft (1) is connected with the rotating shaft of the driving motor (22) through a spline or the rotating shaft of the driving motor (22) is replaced.
2. The pure electric high-speed reduction gearbox according to claim 1, characterized in that: one end of the input sun wheel shaft (1) is connected with one side of the shell (5) through a sun wheel front bearing (3), and the other end of the input sun wheel shaft (1) is connected with the planet carrier (6) through a sun wheel rear bearing (12); the planet carrier output shaft (6-2) is connected with the other side of the shell (5) through a planet carrier rear bearing (20), and one side of the planet carrier (6) close to the driving motor (22) is connected with the shell (5) through a planet carrier front bearing (4).
3. The pure electric high-speed reduction gearbox according to claim 1, characterized in that: a leakage-proof high-speed oil seal (2) is arranged between the shell (5) and the input sun wheel shaft (1), and the high-speed oil seal (2) is positioned between the sun wheel front bearing (3) and the driving motor (22).
4. The pure electric high-speed reduction gearbox according to claim 1, characterized in that: when the driving motor (22) is in direct transmission connection with the planet carrier (6), the output shaft of the driving motor (22) is directly converted into the input sun gear shaft (1).
5. The pure electric high-speed reduction gearbox according to claim 1, characterized in that: the planetary gear set further comprises a parking gear (15), and the parking gear (15) is integrated on the planetary carrier output shaft (6-2) or at the planetary carrier front part (6-1).
6. The pure electric high-speed reduction gearbox according to claim 1, characterized in that: a secondary driven gear (16) is connected to the differential (10), a secondary driving gear (17) is connected to the planet carrier output shaft (6-2), the secondary driving gear (17) is meshed with the secondary driven gear (16), and a left output half shaft (9) and a right output half shaft (14) are arranged on the differential (10); the differential (10) is connected in the housing (5) through a differential front bearing (11) and a differential rear bearing (13).
7. A pure electric high-speed reduction gearbox according to claim 6, characterized in that: the rotating speed and the torque of the left output half shaft (9) and the right output half shaft (14) are the same when the left output half shaft and the right output half shaft move straight; the two rotate at different speeds during turning.
8. The pure electric high-speed reduction gearbox according to claim 1, characterized in that: and an oil cooler assembly (21) for improving the lubricating and cooling performances of each gear pair and the bearing is arranged in the shell (5).
CN202110539826.5A 2021-05-18 2021-05-18 Pure electric high-speed reduction gearbox Pending CN113137456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110539826.5A CN113137456A (en) 2021-05-18 2021-05-18 Pure electric high-speed reduction gearbox

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110539826.5A CN113137456A (en) 2021-05-18 2021-05-18 Pure electric high-speed reduction gearbox

Publications (1)

Publication Number Publication Date
CN113137456A true CN113137456A (en) 2021-07-20

Family

ID=76817221

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110539826.5A Pending CN113137456A (en) 2021-05-18 2021-05-18 Pure electric high-speed reduction gearbox

Country Status (1)

Country Link
CN (1) CN113137456A (en)

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