CN203410439U - Wheel-side motor drive axle for new energy automobile - Google Patents

Wheel-side motor drive axle for new energy automobile Download PDF

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Publication number
CN203410439U
CN203410439U CN201320422333.4U CN201320422333U CN203410439U CN 203410439 U CN203410439 U CN 203410439U CN 201320422333 U CN201320422333 U CN 201320422333U CN 203410439 U CN203410439 U CN 203410439U
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CN
China
Prior art keywords
assembly
motor drive
gear
axle
energy automobile
Prior art date
Application number
CN201320422333.4U
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Chinese (zh)
Inventor
陈言平
崔普金
雷继斌
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简式国际汽车设计(北京)有限公司
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Priority to CN201320422333.4U priority Critical patent/CN203410439U/en
Application granted granted Critical
Publication of CN203410439U publication Critical patent/CN203410439U/en

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Abstract

The utility model relates to the field of new energy automobiles and particularly relates to a wheel-side motor drive axle for a new energy automobile. The wheel-side motor drive axle comprises a cross beam assembly and wheel-side motor driving systems transversely and symmetrically arranged at two sides of the cross beam assembly, wherein the wheel-side motor driving systems comprise drive motor assemblies, first-stage speed reducer assemblies, second-stage speed reducer assemblies, hub assemblies, hydraulic brake assemblies and parking brake assemblies. According to the wheel-side motor drive axle, by arranging hydraulic brakes on shells or axle shaft sleeves of the first-stage speed reducer assemblies of the wheel-side motor driving systems, the hydraulic brakes are matched with brake discs arranged on hubs to realize the hydraulic brake on the hubs, the braking reaction is rapid, and the braking noise is small, so that the requirements on the braking of light-weight and high-end passenger cars are met; furthermore, by utilizing a hydraulic brake manner, the whole drive axle is compact in structure and small in occupied space.

Description

A kind of new-energy automobile wheel motor drive axle

Technical field

The utility model relates to new-energy automobile field, relates in particular to a kind of new-energy automobile wheel motor drive axle.

Background technology

Along with the day by day withered of oil resources aggravates gradually with air-polluting, society is more and more stronger to the cry of new-energy automobile, comprise the form automobiles such as pure electronic, hybrid power, plug-in, fuel cell, new-energy automobile has greatly reduced the pollution to the dependence of oil and atmosphere.New-energy automobile is for traditional combustion engine automobile, because Power supply form is different, no matter be car load master layout pattern, or drive system assembly, all there is great variety, drive system assembly is wherein most important for car load, not only bears bearing function, drives function, and directly determined the safety and comfort performance of car load.

At present, the structure of most of new-energy automobile drive system is by transmission shaft, to connect a traditional back axle by central motor, such mode driving efficiency is poor, system forms complicated, and wheel motor drive axle structure becomes at present an important directions of research both at home and abroad, the drive axle of this structure generally comprises the parts such as drive motor, retarder mechanism, wheel hub, the parts such as driving engine, power-transfer clutch, change speed gear box, transmission shaft, diff, Hub assembly have been replaced, simplify integrated model, improved driving efficiency.

Yet, existing external wheel motor drive axle mostly is and is applicable to the heavy bridge that load-carrying is eight tons of above vehicles, Applicable scope is narrower, its drg adopting is air-pressure brake, air-pressure brake complex structure, take up room large, brake response time is longer, brake noise is larger, be difficult to meet the requirement of the low noise of light-duty high-end passenger vehicle, and existing wheel motor drive axle is because structurally to compare variation larger with traditional drive system, traditional Parking Brake mounting means can not be suitable on existing wheel motor drive axle, so existing wheel motor drive axle makes it brake efficiency is relatively low on the whole because lacking Parking Brake.

Therefore,, for above deficiency, the utility model provides a kind of new-energy automobile wheel motor drive axle.

Utility model content

(1) technical matters that will solve

The purpose of this utility model is to provide the new-energy automobile wheel motor drive axle that is applicable to light-duty high-end passenger vehicle that a kind of brake response is fast, brake noise is little and simple and compact for structure.

(2) technical scheme

In order to solve the problems of the technologies described above, the utility model provides a kind of new-energy automobile wheel motor drive axle, it comprises crossbeam assembly and is symmetrically arranged on the wheel motor drive system of described crossbeam assembly both sides, described wheel motor drive system comprises drive motor assembly, first stage decelerator assembly, two-stage reduction gear assembly, Hub assembly and hydraulic brake assembly, described crossbeam assembly is connected with the inner side of described first stage decelerator assembly, described drive motor assembly is arranged on described crossbeam assembly and with described first stage decelerator assembly and is connected, the outside of described first stage decelerator assembly is connected with axle tube, described first stage decelerator assembly is connected with described two-stage reduction gear assembly by the semiaxis in described axle tube, described Hub assembly is arranged on described axle tube, described Hub assembly is connected with described two-stage reduction gear assembly, described hydraulic brake assembly is arranged on described first stage decelerator assembly or on described axle tube and with the brake disc on described Hub assembly and matches.

Wherein, described first stage decelerator assembly comprises housing and is arranged on motor driving input gear and the output gear being meshed in described housing, described motor drives input gear to be connected with the motor output shaft of described drive motor assembly, and described output gear is connected with described semiaxis.

Wherein, described wheel motor drive system also comprises parking brake assembly, the braking during standstill input gear that described first stage decelerator assembly also comprises and described output gear meshes, and described braking during standstill input gear is connected with described parking brake assembly.

Wherein, described two-stage reduction gear assembly comprises sun wheel, satellite gear, pinion carrier, gear ring and upper shield, described sun wheel and the integrated connection of described semiaxis, described sun wheel and the engagement of described satellite gear, described satellite gear and the engagement of described gear ring, described gear ring is fixed on described axle tube, and described satellite gear is fixed in pinion carrier and drives described pinion carrier to rotate, described pinion carrier is fixed in described upper shield, and described upper shield is connected with described Hub assembly.

Wherein, the integrated connection of housing of described axle tube and described first stage decelerator assembly.

Wherein, also comprise suspension support arms assembly, described suspension support arms assembly is connected with the housing of described first stage decelerator assembly.

Wherein, be provided with drg mounting base on described axle tube, described hydraulic brake is arranged on described drg mounting base.

Wherein, the brake disc on described Hub assembly is venting plate.

Wherein, the both sides of described crossbeam assembly are respectively equipped with opening.

(3) beneficial effect

Technique scheme tool of the present utility model has the following advantages: the new-energy automobile wheel motor drive axle that the utility model provides is by the first stage decelerator assembly in wheel motor drive system or on axle tube, hydraulic brake is set, this hydraulic brake matches with the brake disc being arranged on wheel hub, realization is to wheel hub hydraulic braking, brake response is fast, brake noise is little, thereby meet the requirement of light-duty high-end passenger vehicle to braking, and adopt hydraulic braking mode, make whole drive axle structure compact, take up room little, simultaneously by braking during standstill input gear is set in first stage decelerator assembly, this braking during standstill input gear is connected with Parking Brake, solved the installation question of hydraulic brake system Parking Brake, the braking during standstill of realization to wheel motor drive axle, improved on the whole the brake efficiency of wheel motor drive axle.

Accompanying drawing explanation

Fig. 1 is the birds-eye view of the utility model embodiment new-energy automobile wheel motor drive axle;

Fig. 2 is the structure principle chart of the utility model embodiment new-energy automobile wheel motor drive axle;

Fig. 3 is the three-dimensional structure diagram of first stage decelerator assembly in the utility model embodiment;

Fig. 4 is the three-dimensional structure diagram of Hub assembly in the utility model embodiment;

Fig. 5 is the three-dimensional structure diagram of two-stage reduction gear assembly in the utility model embodiment;

Fig. 6 is the birds-eye view of the utility model embodiment center member assembly.

In figure, 1: crossbeam assembly; 2: drive motor assembly; 3: parking brake assembly; 4: first stage decelerator assembly; 5: brake disc; 6: hydraulic brake assembly; 7: two-stage reduction gear assembly; 8: Hub assembly; 9: suspension support arms assembly; 10: motor drives input gear; 11: output gear; 12: braking during standstill input gear; 13: semiaxis; 14: axle tube; 15: upper shield; 16: drg mounting base; 17: braking during standstill input gear axle.

The specific embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.

As depicted in figs. 1 and 2, the new-energy automobile wheel motor drive axle that the utility model provides comprises crossbeam assembly 1, in the left and right sides of crossbeam assembly 1, be provided with symmetrically two drive motor assemblies 2, two first stage decelerator assemblies 4, two two-stage reduction gear assemblies 7, two Hub assemblies 8, two hydraulic brake assemblies 6, two parking brake assemblies 3 and four suspension support arms assemblies 9.

Crossbeam assembly 1 is connected with the inner side of first stage decelerator assembly 4 housings, in the housing of first stage decelerator assembly 4, there is motor and drive input gear 10, output gear 11 and braking during standstill input gear 12, motor drives input gear 10 and braking during standstill input gear 12 all to mesh with output gear 11, drive motor assembly 2 is arranged on crossbeam, the motor driver output gear 11 of its motor output shaft and first stage decelerator assembly 4 passes through spline joint, the inner side of first stage decelerator assembly 4 housings is also connected with parking brake assembly 3, parking brake assembly 3 is connected with the braking during standstill input gear 12 in first stage decelerator assembly 4 housings, the outside of first stage decelerator assembly 4 is connected with axle tube 14, first stage decelerator assembly 4 is by the semiaxis 13 in axle tube 14 and two-stage reduction gear assembly 7(or title wheel reduction gear assembly) be connected, Hub assembly 8 is arranged on axle tube 14 by bearing, Hub assembly 8 is connected with two-stage reduction gear assembly 7, hydraulic brake assembly 6 is arranged on the housing of first stage decelerator assembly 4 and matches with the brake disc 5 on Hub assembly 8.This hydraulic brake assembly 6 is preferably hydraulic brake, can be designed to as required single pincers single cylinder or single pincers twin-tub, and drive motor assembly 2 can be permanent-magnet synchronous, alternating current asynchronous or other forms.

As shown in Figure 2, the driving principle of the utility model wheel motor drive axle is: the motor driving shaft of drive motor assembly 2 drives input gear 10 to be connected with the motor of first stage decelerator assembly 4, by transmission of power to first stage decelerator assembly 4, the rotating speed of realizing one-level through first stage decelerator assembly 4 reduces and torque increase, then the output gear 11 of first stage decelerator assembly 4 is that two-stage reduction gear assembly 7(is wheel reduction gear assembly by semiaxis 13 by transmission of power), through two-stage reduction gear assembly 7, further reduce rotating speed and increase torque, two-stage reduction gear assembly 7 is connected with Hub assembly 8, realization by transmission of power to wheel hub, thereby drive the rotation of wheel, whole wheel motor drive axle structure is compact, save space, hydraulic brake assembly 6 is arranged on first stage decelerator assembly 4 housings and with the brake disc 5 on Hub assembly 8 and coordinates, and realizes the braking to wheel hub, adopts hydraulic brake, simple in structure, brake noise is little, and brake response is fast, can meet the requirement of light-duty high-end passenger vehicle to braking, the braking during standstill input gear 12 meshing with output gear 11 is set in first stage decelerator, and this braking during standstill input gear 12 is connected with parking brake assembly 3, can realize the braking during standstill to wheel motor drive axle.

Certainly, hydraulic brake assembly 6 also can be arranged on axle tube 14, specifically, and as shown in Figure 3, on axle tube 14, be provided with drg mounting base 16, hydraulic brake assembly 6 is arranged on drg mounting base 16, in the outside of drg mounting base 16, Hub assembly 8 is installed, as shown in Figure 4, on Hub assembly 8, there is brake disc 5, hydraulic brake assembly 6 matches with this brake disc 5, realizes the hydraulic braking to wheel hub, and this brake disc 5 is venting plate.Hydraulic brake is arranged on axle tube 14 by drg mounting base 16, easy for installation, simple and compact for structure; Brake disc 5 adopts venting plate, can improve the heat-sinking capability of hydraulic brake assembly 6, improves heat stability and the water stability of drg, and then improves the safety of car load.

Again as shown in Figure 3, braking during standstill input gear 12 forms with braking during standstill input gear axle 17 integrally castings, this gear wheel shaft stretches out outside first stage decelerator assembly 4 housings and is connected with the brake wheel of Parking Brake, and parking brake assembly 3 is arranged on the mount pad being connected with first stage decelerator housing.In traditional drive axle, Parking Brake is mounted on the transmission shaft between change-speed box and back axle, and in wheel motor drive axle due to the change of type of drive, traditional Parking Brake mounting means can not be suitable on existing wheel motor drive axle, existing wheel motor drive axle lacks Parking Brake, the utility model arranges the braking during standstill input gear 12 with output gear 11 engagements in first stage decelerator, parking brake assembly 3 is connected with the gear wheel shaft of this braking during standstill input gear 12, realized easily the parking braking function of wheel motor drive axle, combine with the hydraulic braking function of wheel motor drive axle, can improve on the whole the brake efficiency to wheel motor drive axle, solved the installation question of hydraulic brake system Parking Brake, the brake request that is applicable to high-end light bus.

Further, axle tube 14 by integrated connection of mode of welding, like this, can prevent axle tube 14 and the 4 housing junction leakage of oils of first stage decelerator assembly with first stage decelerator assembly 4 housings, guarantees the leak tightness of primary speed-down.

As shown in Figure 2 and Figure 5, two-stage reduction gear assembly 7 is planetary reduction gear, it comprises sun wheel, satellite gear, pinion carrier, gear ring and upper shield 15, sun wheel adopts the mode of integrated casting to be connected with semiaxis 13, sun wheel and satellite gear engagement, satellite gear and gear ring engagement, gear ring is fixed on axle tube 14, satellite gear is fixed in pinion carrier and drives pinion carrier to rotate, and pinion carrier is fixed in upper shield 15, and upper shield 15 is connected with Hub assembly 8.Like this, semiaxis 13 rotating drive sun wheels are rotated, the rotation of sun wheel rotating drive satellite gear, satellite gear rotates the rotation that drives pinion carrier, in the fixing upper shield 15 of pinion carrier, thereby drive the rotation of upper shield 15, and then the wheel hub that driving is connected with upper shield 15 rotates, realized rotating speed reduction and the torque increase of secondary.The sun wheel of two-stage reduction gear assembly 7 mode that integrated casting is connected with semiaxis 13 is not affecting under the prerequisite of sun wheel performance, with respect to spline joint, can make the size decreases of sun wheel, thereby reduced the volume of two-stage reduction gear assembly 7, and then can save taking up room of whole wheel motor bridge.

As shown in Figure 1, one end of suspension support arms assembly 9 is connected on the front end or rear end of first stage decelerator assembly 4 housings, is provided with air bag attachment point on suspension support arms assembly 9, and this suspension support arms assembly 9 is for support air suspension.When axle tube 14 has installing space in length, can directly on axle tube 14, Leaf Spring Suspension be set.

As shown in Figure 6, the both sides of crossbeam assembly 1 are provided with opening, and this opening not only can improve the heat dispersion of motor, with the function of draining blowdown, and can reduce material usage, realize the lightweight of wheel motor bridge.By changing the lateral dimension of crossbeam assembly 1, can realize the vehicle of the different wheelspans of coupling, by changing the thickness of crossbeam assembly 1, can meet different axle load vehicle demands.

New-energy automobile wheel motor bridge of the present utility model is specially adapted to other high-end Light-duty Vehicle such as eight tons of following medium buss, commercial vehicle.

In sum, the new-energy automobile wheel motor drive axle that the utility model provides is by arranging hydraulic brake assembly 6 on the housing of the first stage decelerator assembly 4 in wheel motor drive system or on axle tube 14, this hydraulic brake matches with the brake disc 5 that assembly is arranged on Hub assembly 8, realization is to wheel hub hydraulic braking, brake structure is simple, brake response is fast, and brake noise is little, thereby meets the requirement of light-duty high-end passenger vehicle to braking; By the braking during standstill input gear 12 meshing with output gear 11 is set in first stage decelerator assembly 4, parking brake assembly 3 is connected with the gear wheel shaft of this braking during standstill input gear 12, realized easily the parking braking function of wheel motor drive axle, improve on the whole the brake efficiency to wheel motor drive axle, be applicable to the brake request of high-end light bus; By axle tube 14 and integrated connection of first stage decelerator assembly 4 housings, guarantee the leak tightness of first stage decelerator assembly 4; By sun wheel, adopt the mode of integrated casting to be connected with semiaxis 13, reduced the size of sun wheel, and then reduced taking up room of two-stage reduction gear assembly 7.

Below be only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.

Claims (9)

1. a new-energy automobile wheel motor drive axle, it is characterized in that: the wheel motor drive system that it comprises crossbeam assembly (1) and is symmetrically arranged on described crossbeam assembly (1) both sides, described wheel motor drive system comprises drive motor assembly (2), first stage decelerator assembly (4), two-stage reduction gear assembly (7), Hub assembly (8) and hydraulic brake assembly (6), described crossbeam assembly (1) is connected with the inner side of described first stage decelerator assembly (4), described drive motor assembly (2) is arranged on described crossbeam assembly (1) above and is connected with described first stage decelerator assembly (4), the outside of described first stage decelerator assembly (4) is connected with axle tube (14), described first stage decelerator assembly (4) is connected with described two-stage reduction gear assembly (7) by the semiaxis (13) in described axle tube (14), described Hub assembly (8) is arranged on described axle tube (14), described Hub assembly (8) is connected with described two-stage reduction gear assembly (7), described hydraulic brake assembly (6) is arranged on described first stage decelerator assembly (4) or on described axle tube (14) and matches with the brake disc (5) on described Hub assembly (8).
2. new-energy automobile wheel motor drive axle according to claim 1, it is characterized in that: described first stage decelerator assembly (4) comprises housing and is arranged on motor driving input gear (10) and the output gear (11) being meshed in described housing, described motor drives input gear (10) to be connected with the motor output shaft of described drive motor assembly (2), and described output gear (11) is connected with described semiaxis (13).
3. new-energy automobile wheel motor drive axle according to claim 2, it is characterized in that: described wheel motor drive system also comprises parking brake assembly (3), the braking during standstill input gear (12) that described first stage decelerator assembly (4) also comprises and described output gear (11) meshes, described braking during standstill input gear (12) is connected with described parking brake assembly (3).
4. new-energy automobile wheel motor drive axle according to claim 1, it is characterized in that: described two-stage reduction gear assembly (7) comprises sun wheel, satellite gear, pinion carrier, gear ring and upper shield (15), described sun wheel and the integrated connection of described semiaxis (13), described sun wheel and the engagement of described satellite gear, described satellite gear and the engagement of described gear ring, described gear ring is fixed on described axle tube (14), described satellite gear is fixed in pinion carrier and drives described pinion carrier to rotate, described pinion carrier is fixed in described upper shield (15), described upper shield (15) is connected with described Hub assembly (8).
5. new-energy automobile wheel motor drive axle according to claim 2, is characterized in that: the integrated connection of housing of described axle tube (14) and described first stage decelerator assembly (4).
6. new-energy automobile wheel motor drive axle according to claim 2, is characterized in that: also comprise suspension support arms assembly (9), described suspension support arms assembly (9) is connected with the housing of described first stage decelerator assembly (4).
7. new-energy automobile wheel motor drive axle according to claim 1, is characterized in that: on described axle tube (14), be provided with drg mounting base (16), described hydraulic brake is arranged on described drg mounting base (16).
8. new-energy automobile wheel motor drive axle according to claim 1, is characterized in that: the brake disc (5) on described Hub assembly (8) is venting plate.
9. new-energy automobile wheel motor drive axle according to claim 1, is characterized in that: the both sides of described crossbeam assembly (1) are respectively equipped with opening.
CN201320422333.4U 2013-07-16 2013-07-16 Wheel-side motor drive axle for new energy automobile CN203410439U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320422333.4U CN203410439U (en) 2013-07-16 2013-07-16 Wheel-side motor drive axle for new energy automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320422333.4U CN203410439U (en) 2013-07-16 2013-07-16 Wheel-side motor drive axle for new energy automobile

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104290721A (en) * 2013-07-16 2015-01-21 简式国际汽车设计(北京)有限公司 Wheel motor drive axle of new energy automobile
CN104908581A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 Wheel side motor driving system and wheel side motor driving axle
CN104913031A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 End cover structure of speed reducer assembly, wheel edge motor driving system and driving axle
CN104908579A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 Wheel rim motor driving system and wheel rim motor driving axle
CN104913024A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 Gear supporting structure, hub motor drive system and hub motor drive axle
CN105398321A (en) * 2014-09-10 2016-03-16 比亚迪股份有限公司 Power transmission system for vehicle and vehicle provided with power transmission system
CN105437948A (en) * 2014-09-26 2016-03-30 比亚迪股份有限公司 Hybrid electric vehicle and reverse gear control method and power transmission system
CN105459798A (en) * 2014-09-30 2016-04-06 比亚迪股份有限公司 Hybrid power vehicle as well as control method and power transmission system thereof
CN105459788A (en) * 2014-09-10 2016-04-06 比亚迪股份有限公司 Power transmission system for vehicle and vehicle with the same
CN105522908A (en) * 2014-09-30 2016-04-27 比亚迪股份有限公司 Hybrid/electric automobile and control method thereof and power transmission system
CN107878180A (en) * 2017-11-19 2018-04-06 福建工程学院 A kind of new-energy automobile wheel motor drive axle

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104290721B (en) * 2013-07-16 2016-02-10 简式国际汽车设计(北京)有限公司 A kind of new-energy automobile wheel motor drive axle
CN104290721A (en) * 2013-07-16 2015-01-21 简式国际汽车设计(北京)有限公司 Wheel motor drive axle of new energy automobile
CN105459788B (en) * 2014-09-10 2018-08-14 比亚迪股份有限公司 Power drive system for vehicle and the vehicle with it
CN105459788A (en) * 2014-09-10 2016-04-06 比亚迪股份有限公司 Power transmission system for vehicle and vehicle with the same
CN105398321A (en) * 2014-09-10 2016-03-16 比亚迪股份有限公司 Power transmission system for vehicle and vehicle provided with power transmission system
CN105398321B (en) * 2014-09-10 2018-09-11 比亚迪股份有限公司 Power drive system for vehicle and the vehicle with the power drive system
CN105437948A (en) * 2014-09-26 2016-03-30 比亚迪股份有限公司 Hybrid electric vehicle and reverse gear control method and power transmission system
CN105459798A (en) * 2014-09-30 2016-04-06 比亚迪股份有限公司 Hybrid power vehicle as well as control method and power transmission system thereof
CN105522908A (en) * 2014-09-30 2016-04-27 比亚迪股份有限公司 Hybrid/electric automobile and control method thereof and power transmission system
CN104913024A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 Gear supporting structure, hub motor drive system and hub motor drive axle
CN104908579A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 Wheel rim motor driving system and wheel rim motor driving axle
CN104908579B (en) * 2015-05-31 2017-12-26 简式国际汽车设计(北京)有限公司 A kind of wheel motor drive system and a kind of wheel motor drive axle
CN104908581B (en) * 2015-05-31 2018-04-27 简式国际汽车设计(北京)有限公司 A kind of wheel motor drive system and a kind of wheel motor drive axle
CN104908581A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 Wheel side motor driving system and wheel side motor driving axle
CN104913031A (en) * 2015-05-31 2015-09-16 简式国际汽车设计(北京)有限公司 End cover structure of speed reducer assembly, wheel edge motor driving system and driving axle
CN107878180A (en) * 2017-11-19 2018-04-06 福建工程学院 A kind of new-energy automobile wheel motor drive axle

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Granted publication date: 20140129

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C25 Abandonment of patent right or utility model to avoid double patenting