CN111923728A - Coaxial electric drive axle arrangement structure of commercial car - Google Patents

Coaxial electric drive axle arrangement structure of commercial car Download PDF

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Publication number
CN111923728A
CN111923728A CN202010867396.5A CN202010867396A CN111923728A CN 111923728 A CN111923728 A CN 111923728A CN 202010867396 A CN202010867396 A CN 202010867396A CN 111923728 A CN111923728 A CN 111923728A
Authority
CN
China
Prior art keywords
electric drive
rear axle
axle
drive system
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010867396.5A
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Chinese (zh)
Inventor
吴四军
朱雷
杨守银
王旭峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Yikong Power System Co ltd
Original Assignee
Shanghai Yikong Power System Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Yikong Power System Co ltd filed Critical Shanghai Yikong Power System Co ltd
Priority to CN202010867396.5A priority Critical patent/CN111923728A/en
Publication of CN111923728A publication Critical patent/CN111923728A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B60K17/12—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of electric gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/121—Power-transmission from drive shaft to hub
    • B60B35/122—Power-transmission from drive shaft to hub using gearings
    • B60B35/125—Power-transmission from drive shaft to hub using gearings of the planetary type
    • 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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • 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
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion

Abstract

A coaxial electric drive axle arrangement structure of a commercial vehicle comprises an electric drive system, a rear axle assembly, a vehicle frame and a universal coupling; the electric drive system comprises an electric drive system shell assembly, a motor and a planetary gear reducer, the electric drive system shell assembly is arranged behind the rear axle assembly and is fixed on the frame by adopting three-point suspension, the motor and the planetary gear reducer are coaxially connected and are arranged in the electric drive system shell assembly, and a planet carrier of the planetary gear reducer and a rear axle main speed reduction input gear of the rear axle assembly are respectively connected with two ends of the universal coupling. The electric drive axle arrangement structure is arranged behind the rear axle, and the electric drive system adopts a coaxial arrangement structure, so that the structure is more compact, and the battery arrangement space is increased; the universal coupling is adopted to decouple the electric drive system and the rear axle differential, the weight of the electric drive system is sprung mass, the unsprung mass is kept unchanged compared with the traditional commercial vehicle, and the problems of poor operability and poor NVH (noise, vibration and harshness) caused by a rear integral bridge type arrangement structure are effectively solved.

Description

Coaxial electric drive axle arrangement structure of commercial car
Technical Field
The invention belongs to the technical field of electric commercial vehicles, relates to a driving system, and particularly relates to a coaxial electric drive axle arrangement structure of a commercial vehicle.
Background
Conventional commercial vehicle electric drive axles generally employ a central integrated arrangement and a rear integrated bridge arrangement.
The central integrated arrangement is typically a mid-mounted rear drive arrangement. Referring to fig. 1, a motor 1 and a gearbox 2 are integrated together to form an electric drive system, and are integrated on a vehicle body through three-point suspension, and then torque is transmitted to a rear axle differential 6 and finally to a rear wheel 7 through a transmission shaft 3 and a rear axle main reduction input gear 4. The two ends of the transmission shaft 3 are provided with universal joints 5, so that the torque transmission of the electric drive system with a transmission included angle under the vibration working condition can be met. However, the arrangement structure occupies most of the space in the middle of the chassis of the vehicle body, and the arrangement of the battery is greatly influenced. Because the commercial vehicle has the demand of pulling and sending load in practice, the battery endurance has higher requirement, and the arrangement structure seriously influences the arrangement of the battery, so that the cost performance of the whole vehicle is lower.
The rear integrated bridge arrangement generally connects the electric drive system and the bridge as a single unit. Referring to fig. 2, the arrangement generally integrates the motor 1 and the gearbox 2 on a rear axle assembly, and the structure is integrally connected with the vehicle body without suspension and belongs to unsprung mass. Although the arrangement structure can save the space of the chassis and increase the arrangement space of the battery, the arrangement structure and the rear axle assembly are integrated into an unsprung mass, and the increase of the unsprung mass can bring problems of maneuverability and NVH to the whole vehicle, so that the market complaint rate is high, and the development technology is difficult.
Disclosure of Invention
The invention aims at the problems and provides a coaxial electric drive axle arrangement structure of a commercial vehicle.
The purpose of the invention can be realized by the following technical scheme: a coaxial electric drive axle arrangement structure of a commercial vehicle comprises an electric drive system, a rear axle assembly, a vehicle frame and a universal coupling; the electric drive system comprises an electric drive system shell assembly, a motor and a planetary gear reducer, the electric drive system shell assembly is arranged at the rear of the rear axle assembly and fixed on the frame by adopting three-point suspension, the motor and the planetary gear reducer are coaxially connected and installed in the electric drive system shell assembly, and a planet carrier of the planetary gear reducer and a rear axle main speed reduction input gear of the rear axle assembly are respectively connected with two ends of the universal coupling.
Further, an output shaft of the motor is disposed rightward in the vehicle body width direction.
Furthermore, the electric drive system shell assembly is fixed on a left longitudinal beam and a rear cross beam of the frame by adopting three-point suspension. Furthermore, the three-point suspension is respectively a first suspension and a second suspension which are connected to the left longitudinal beam, and a third suspension which is connected to the rear cross beam, the first suspension supports a part of the electric drive system shell assembly corresponding to the motor, and the second suspension and the third suspension support a part of the electric drive system shell assembly corresponding to the planetary gear reducer.
Further, the planetary gear reducer comprises a sun gear, a planet carrier and a gear ring, the sun gear is connected with an output shaft of the motor, and the gear ring is fixed on the shell assembly of the electric drive system.
Furthermore, the two ends of the universal coupling are universal joints, one end of the universal coupling is connected with a planet carrier of the planetary gear reducer through an output flange, and the other end of the universal coupling is connected with a main speed reduction input gear of the rear axle through a rear axle input flange.
The rear axle assembly comprises a rear axle housing assembly, a rear axle main speed reduction input gear, a rear axle differential, a left half axle adapter shaft, a left half axle and a right half axle, wherein the rear axle main speed reduction input gear, the rear axle differential, the left half axle adapter shaft and the right half axle are arranged in the rear axle housing assembly, the rear axle main speed reduction input gear is meshed with a main speed reduction driven gear of the rear axle differential, two half axle gears of the rear axle differential are respectively connected with the left half axle adapter shaft and the right half axle, and the left half axle adapter shaft is connected with the left half axle. Furthermore, a first connecting flange and a second connecting flange are respectively fixed at the left end of the left half shaft rotating shaft and the right end of the left half shaft, and the first connecting flange is connected with the second connecting flange.
Compared with the prior art, the invention has the beneficial effects that: the electric drive axle arrangement structure is arranged behind the rear axle, and the electric drive system adopts a coaxial arrangement structure, so that the structure is more compact, the size in the width aspect is greatly reduced, the battery arrangement space is increased, the battery pack can be arranged from the rear axle to the head direction of a vehicle, the space utilization rate of a vehicle body is greatly increased, and the higher requirements of commercial vehicles on load and endurance are effectively met; adopt universal joint decoupling zero electric drive system and rear axle differential mechanism, electric drive system is fixed in on the longeron and the crossbeam of automobile body through three point suspension, and its weight is sprung mass, and unsprung mass keeps unchangeable than traditional commercial car for weight obtains reducing, has effectively solved the poor problem of maneuverability and NVH difference that the rearmounted whole bridge type arrangement structure of electric drive axle brought.
Drawings
Fig. 1 is a schematic view of a central integrated arrangement of an electric drive axle of a commercial vehicle according to the prior art.
Fig. 2 is a schematic view of a rear integrated bridge arrangement of a drive axle of a commercial vehicle according to the prior art.
The components in fig. 1 and 2 are numbered as follows:
1 motor, 2 gear boxes, 3 transmission shafts, 4 rear axle main reduction input gears, 5 universal joints, 6 differentials and 7 rear wheels.
Fig. 3 is a schematic structural diagram of the present invention.
The components in fig. 3 are numbered as follows:
the device comprises an electric drive system shell assembly 1, a motor 2, a sun gear 3, a planet gear 4, a planet carrier 5, a gear ring 6, a left longitudinal beam 7, a rear cross beam 8, a first suspension 9, a second suspension 10, a third suspension 11, a rear axle housing assembly 12, a rear axle main reduction input gear 13, a rear axle differential 14, a left half axle adapter shaft 15, a left half axle 16, a right half axle 17, a first connecting flange 18, a second connecting flange 19, a universal coupling 20, an output flange 21 and a rear axle input flange 22.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.
Referring to fig. 3, a coaxial electric drive axle arrangement structure of a commercial vehicle comprises an electric drive system, a rear axle assembly, a vehicle frame and a universal coupling 20.
The electric drive system comprises an electric drive system shell assembly 1, a motor 2 and a planetary gear reducer. The motor 2 and the planetary gear reducer are installed in the electric drive system shell assembly 1, an output shaft of the motor 2 is arranged towards the right in the width direction of the vehicle body, the planetary gear reducer comprises a sun gear 3, a planet gear 4, a planet carrier 5 and a gear ring 6, the sun gear 3 is connected with the output shaft of the motor 2, and the gear ring 6 is fixed on the electric drive system shell assembly 1. The electric drive system shell assembly 1 is arranged behind a rear axle assembly and is fixed on a left longitudinal beam 7 and a rear cross beam 8 of the frame by adopting three-point suspension, wherein the three-point suspension comprises a first suspension 9 and a second suspension 10 which are connected to the left longitudinal beam 7 and a third suspension 11 which is connected to the rear cross beam 8, the first suspension 9 supports a part of the electric drive system shell assembly 1 corresponding to the motor 2, and the second suspension 10 and the third suspension 11 support a part of the electric drive system shell assembly 1 corresponding to the planetary gear reducer.
The rear axle assembly comprises a rear axle housing assembly 12, a rear axle main speed reduction input gear 13, a rear axle differential 14, a left half axle adapter shaft 15, a left half axle 16, a right half axle 17, a first connecting flange 18 and a second connecting flange 19. Rear axle final reduction input gear 13, rear axle differential 14, left semi-axis adapter shaft 15, right semi-axis 17 install in rear axle housing assembly 12, rear axle final reduction input gear 13 and rear axle differential 14's final reduction driven gear meshing, two semi-axis gears of rear axle differential 14 are connected with the right-hand member of left semi-axis adapter shaft 15 and the left end of right semi-axis 17 respectively, the left end of left side semi-axis adapter shaft 15 and the right-hand member of left semi-axis 16 are fixed with first flange 18 and second flange 19 respectively, first flange 18 and second flange 19 are connected.
The two ends of the universal coupling 20 are universal joints, one end of the universal coupling is connected with the planet carrier 5 of the planetary gear reducer through an output flange 21, and the other end of the universal coupling is connected with the rear axle main speed reduction input gear 13 through a rear axle input flange 22. The universal coupling 20 can meet the torque transmission of the electric drive system with a transmission included angle under the vibration working condition.
During operation, the motor 2 transmits torque to the sun gear 3 of the planetary gear reducer, the torque is transmitted to the output flange 21 through the planetary gear reducer and the planet carrier 5, then transmitted to the rear axle input flange 22 through the universal coupling 20, then transmitted to the rear axle differential 14 through the rear axle main speed reduction input gear 13, and finally transmitted to the left rear wheel through the left half axle connecting shaft 15, the first connecting flange 18, the second connecting flange 19 and the left half axle 16, and transmitted to the right rear wheel through the right half axle 17.
This electric drive axle arrangement structure arranges in the rear axle rear, and the automobile body length of considering small-size commercial vehicles such as little card is shorter, and electric drive system adopts coaxial arrangement structure, has reduced the size in the aspect of the width greatly to be applicable to little card, bread class motorcycle type. Compared with the existing electric drive axle central integrated arrangement structure, the electric drive axle arrangement structure is more compact, the size in the width direction is greatly reduced, the battery arrangement space is increased, the battery pack can be arranged from the rear axle to the vehicle head direction, the vehicle body space utilization rate is greatly increased, and the higher requirements of the commercial vehicle on load and endurance are effectively met. Compare with the rearmounted whole bridge type arrangement structure of current electric drive axle, this electric drive axle arrangement structure has decoupled electric drive system and rear axle differential 14 effectively through universal joint 20, electric drive system is fixed in on the longeron and the crossbeam of automobile body through three point suspension, its weight is sprung mass, unsprung mass keeps unchangeable than traditional commercial car for weight obtains reducing, the maneuverability that has effectively solved the rearmounted whole bridge type arrangement structure of current electric drive axle and has brought is poor with the poor problem of NVH, the sexual valence relative altitude.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims (8)

1. A coaxial electric drive axle arrangement structure of a commercial vehicle is characterized by comprising an electric drive system, a rear axle assembly, a vehicle frame and a universal coupling; the electric drive system comprises an electric drive system shell assembly, a motor and a planetary gear reducer, the electric drive system shell assembly is arranged at the rear of the rear axle assembly and fixed on the frame by adopting three-point suspension, the motor and the planetary gear reducer are coaxially connected and installed in the electric drive system shell assembly, and a planet carrier of the planetary gear reducer and a rear axle main speed reduction input gear of the rear axle assembly are respectively connected with two ends of the universal coupling.
2. The arrangement of a coaxial electric drive axle of a commercial vehicle according to claim 1, characterized in that the output shaft of the electric motor is disposed toward the right in the vehicle body width direction.
3. The arrangement structure of coaxial electric drive axles of commercial vehicles according to claim 1, characterized in that the electric drive system housing assembly is fixed to the left longitudinal beam and the rear cross beam of the vehicle frame using three-point suspension.
4. A commercial vehicle coaxial electric drive axle arrangement according to claim 3, characterized in that the three-point suspensions are respectively a first suspension and a second suspension connected to the left longitudinal beam, the first suspension supporting a part of the electric drive system housing assembly corresponding to the electric motor, and the second suspension and the third suspension supporting a part of the electric drive system housing assembly corresponding to the planetary gear reducer.
5. The arrangement of coaxial electric drive axles of commercial vehicles according to claim 1, characterized in that the planetary gear reducer comprises a sun gear, planet gears, a planet carrier, a ring gear, the sun gear being connected with the output shaft of the electric machine, the ring gear being fixed to the electric drive system housing assembly.
6. The arrangement structure of coaxial electric drive axle of commercial vehicle according to claim 1, characterized in that, the two ends of the universal coupling are universal joints, one end is connected with the planet carrier of the planetary gear reducer through the output flange, and the other end is connected with the main speed reduction input gear of the rear axle through the rear axle input flange.
7. The arrangement structure of coaxial electric drive axles of commercial vehicles according to any one of claims 1 to 6, wherein the rear axle assembly comprises a rear axle housing assembly, a rear axle main speed reduction input gear, a rear axle differential, a left half axle adapter shaft, a left half axle and a right half axle, the rear axle main speed reduction input gear, the rear axle differential, the left half axle adapter shaft and the right half axle are installed in the rear axle housing assembly, the rear axle main speed reduction input gear is meshed with a main speed reduction driven gear of the rear axle differential, two half axle gears of the rear axle differential are respectively connected with the left half axle adapter shaft and the right half axle, and the left half axle adapter shaft and the left half axle are connected.
8. The arrangement structure of coaxial electric drive axle of commercial vehicle of claim 7, characterized in that the left end of the left half axle shaft and the right end of the left half axle shaft are respectively fixed with a first connecting flange and a second connecting flange, and the first connecting flange and the second connecting flange are connected.
CN202010867396.5A 2020-08-25 2020-08-25 Coaxial electric drive axle arrangement structure of commercial car Pending CN111923728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010867396.5A CN111923728A (en) 2020-08-25 2020-08-25 Coaxial electric drive axle arrangement structure of commercial car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010867396.5A CN111923728A (en) 2020-08-25 2020-08-25 Coaxial electric drive axle arrangement structure of commercial car

Publications (1)

Publication Number Publication Date
CN111923728A true CN111923728A (en) 2020-11-13

Family

ID=73305900

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010867396.5A Pending CN111923728A (en) 2020-08-25 2020-08-25 Coaxial electric drive axle arrangement structure of commercial car

Country Status (1)

Country Link
CN (1) CN111923728A (en)

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