CN108571580A - A kind of aluminum material main reducing gear of drive axle shell and its manufacturing method - Google Patents
A kind of aluminum material main reducing gear of drive axle shell and its manufacturing method Download PDFInfo
- Publication number
- CN108571580A CN108571580A CN201710145032.4A CN201710145032A CN108571580A CN 108571580 A CN108571580 A CN 108571580A CN 201710145032 A CN201710145032 A CN 201710145032A CN 108571580 A CN108571580 A CN 108571580A
- Authority
- CN
- China
- Prior art keywords
- bearing
- steel bushing
- steel
- shell
- aluminum
- 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
Links
Classifications
-
- 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
- F16H57/032—Gearboxes; Mounting gearing therein characterised by the materials used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
-
- 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
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/037—Gearboxes for accommodating differential gearings
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- General Details Of Gearings (AREA)
Abstract
The present invention relates to a kind of aluminum material main reducing gear of drive axle shell and its manufacturing methods, it includes tandem axles bevel housing and non-through formula main reducing gear of drive axle shell, and the shell further includes having alloy matrix aluminum, steel skeleton, main cone bearing hole steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing and bolt hole steel mold insert；The main cone bearing hole steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing and bolt hole steel mold insert are respectively arranged on alloy matrix aluminum.Shell of the present invention is by applying aluminum material, structure design is carried out in conjunction with simulation analysis, have many advantages, such as that light-weight, rigidity of support is good, intensity is high, assembly reliability is high, technique has a wide range of application, design concept is advanced, while increasing anti-play of bearing and enclosing design, the design of high strength bond face.
Description
Technical field
The present invention relates to a kind of bevel housing, especially a kind of aluminum material main reducing gear of drive axle shell and
Its manufacturing method.
Background technology
The effect of the main reducing gear of automobile drive axle is to reduce the torque transmitted from main shaft, is changed to increase torque
Power direction of transfer, running part be by a pair of intermeshing bevel gear set at, power by drive bevel gear pass to by
Dynamic bevel gear, while having achieved the purpose that transmitting power, change power direction and deceleration, the strength and stiffness of shell determines
The service life of whole bridge, and its weight influences the economy such as the oil consumption of vehicle.Subtract shell intensity, rigidity and bevel gear meeting
Under the premise of rigidity of support, weight is lighter, and product is more competitive.And main gearbox assembly middle casing currently on the market etc. zero
Component mostly uses cast iron alloy material, such as spheroidal graphite cast-iron QT450, QT500 material, and forming method predominantly casts, produced
It is less economical in journey, high processing costs；It is in use, unfavorable to the economy of vehicle since weight weight, energy consumption are high,
It is unfavorable for energy-saving and emission-reduction.
In order to constantly meet the light-weighted requirement of vehicle, the materials such as cast iron are replaced to have become automobile by application new material
The important directions of drive axle development, aluminum alloy materials are since its own density is small, technical maturity at present, to become automobile light weight
Change preferred material.Since aluminium alloy density and elasticity modulus only have steel one third, when using single aluminum alloy materials, need to increase
Add volume meet bevel housing intensity, rigidity and bevel gear pair rigidity of support requirement, loss of weight space is limited, and aluminium
Alloy material has the shortcomings that coefficient of thermal expansion is big, yield strength is low, heat fading is notable, so not using single aluminum alloy materials
Requirement can reliably be met.
Invention content
For the technical problem for solving in above-mentioned background technology, the present invention provides a kind of aluminum material driving bridge main reducings
Fast device shell and its manufacturing method, this lightweight aluminum material bevel housing are tied by applying aluminum material
It closes simulation analysis and carries out structure design, have that light-weight (loss of weight ratio up to 40%), rigidity of support is good, intensity is high, assembly is reliable
Property it is high, technique has a wide range of application, design concept is advanced the advantages that, while increasing that bearing is anti-to play circle design, high strength bond face
Design.
Specifically, aluminum material main reducing gear of drive axle shell of the present invention includes tandem axles
Bevel housing, the shell further include having alloy matrix aluminum, steel skeleton, main cone bearing hole steel bushing, differential axle bearing bore
Steel bushing, bearing of input shaft steel bushing and bolt hole steel mold insert；The main cone bearing hole steel bushing, differential axle bearing bore steel bushing, input
Axle bearing steel bushing and bolt hole steel mold insert are respectively arranged on alloy matrix aluminum.Further include having non-through formula driving bridge main reducing speed
Device shell, the shell further include have alloy matrix aluminum, steel skeleton, main cone bearing hole steel bushing, differential axle bearing bore steel bushing and
Bolt hole steel mold insert；The steel skeleton, main cone bearing hole steel bushing, differential axle bearing bore steel bushing and bolt hole steel mold insert point
It is not set on alloy matrix aluminum.
Further include having main cone bearing outer ring, bearing of input shaft outer ring in an embodiment；It is the main cone bearing outer ring, defeated
Enter axle bearing outer ring to be interference fitted respectively on indentation main cone bearing hole steel bushing and bearing of input shaft steel bushing, thus and alloy matrix aluminum
It is connected and fixed.
Further include having cup, diff. side bearing in an embodiment；The cup, diff. side bearing is assemblied in differential axle
On bearing bore steel bushing, to be connected and fixed with alloy matrix aluminum.
Further include bevel housing bolt hole in an embodiment；It is equipped with around the bevel housing bolt hole
Bolt hole steel mold insert, and bolt hole steel mold insert end face is exposed on alloy matrix aluminum, directly with bolt or other fasteners
Connection.
In an embodiment, main cone bearing hole steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing is all made of and institute
Main cone bearing outer ring, cup, diff. side bearing, the identical linear expansion material in bearing of input shaft outer ring is stated to be made.
In an embodiment, steel skeleton, main cone bearing hole steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing
It is the structures such as latticed or ladder-like with alloy matrix aluminum faying face.
Aluminum material main reducing gear of drive axle manufacture of casing of the present invention includes the following steps：1) it prepares
Steel bushing, and active processing is done to surface；2) it is fastened by bolts or other connection type assembling shell internal steel mold inserts；3) it melts
Aluminium metallurgy alloy；4) aluminum alloy melt injection is installed in preheated steel bushing and mold insert mold；5) global formation；6) at T6 heat
Reason.
Description of the drawings
Fig. 1 is tandem axles bevel housing main structure diagram；
Fig. 2 is tandem axles bevel housing left view structural representation；
Fig. 3 is non-through formula main reducing gear of drive axle shell main structure diagram；
Fig. 4 is non-through formula main reducing gear of drive axle shell left view structural representation.
Main element symbol description：
1 alloy matrix aluminum
2 steel mold inserts
3 tandem axles bevel housings
4 non-through formula main reducing gear of drive axle shells
5 steel skeletons
6 main cone bearing hole steel bushings
7 main cone bearing outer rings
8 differential axle bearing bore steel bushings
9 cup, diff. side bearings
10 bearing of input shaft steel bushings
11 bearing of input shaft outer rings
12 bolt hole steel mold inserts
13 bolt hole steel mold insert end faces；
Specific implementation mode
With reference to embodiments and technical scheme of the present invention is described in detail in respective drawings, so that art technology
The solution of the present invention can be more clearly understood in personnel, but the protection domain being not intended to limit the present invention.
The present invention provides a kind of aluminum material main reducing gear of drive axle shell and its manufacturing method, this lightweight steel
Aluminium composite material bevel housing carries out structure design by applying aluminum material, in conjunction with simulation analysis, has weight
Gently (loss of weight ratio up to 40%), rigidity of support is good, intensity is high, assembly reliability is high, technique has a wide range of application, design concept is advanced
The advantages that, while increasing anti-play of bearing and enclosing design, the design of high strength bond face.
Specifically, aluminum material main reducing gear of drive axle shell of the present invention includes tandem axles
Bevel housing 3 and non-through formula main reducing gear of drive axle shell 4, the shell further include having alloy matrix aluminum 1, steel bone
Frame 5, main cone bearing hole steel bushing 6, differential axle bearing bore steel bushing 8, bearing of input shaft steel bushing 10 and bolt hole steel mold insert 12；It is described
Main cone bearing hole steel bushing 6, differential axle bearing bore steel bushing 8, bearing of input shaft steel bushing 10 and bolt hole steel mold insert 2 are respectively arranged at
On alloy matrix aluminum 1.
Further include having main cone bearing outer ring 7, bearing of input shaft outer ring 11 in an embodiment；The main cone bearing outer ring
7, bearing of input shaft outer ring 11 is interference fitted respectively on indentation main cone bearing hole steel bushing 6 and bearing of input shaft steel bushing 10, thus with
Alloy matrix aluminum 1 is connected and fixed.
Further include having cup, diff. side bearing 9 in an embodiment；The cup, diff. side bearing 9 is assemblied in differential mechanism
On bearing hole steel bushing 8, to be connected and fixed with alloy matrix aluminum 1.
Further include bevel housing bolt hole in an embodiment；It is equipped with around the bevel housing bolt hole
Bolt hole steel mold insert 12, and bolt hole steel mold insert end face 13 is exposed on alloy matrix aluminum 1, directly with bolt or other are tight
Firmware connects.
In an embodiment, main cone bearing hole steel bushing 6, differential axle bearing bore steel bushing 8, bearing of input shaft steel bushing 10 are all made of
Linear expansion material identical as the main cone bearing outer ring 7, cup, diff. side bearing 9, bearing of input shaft outer ring 11 is made.
In an embodiment, steel skeleton 5, main cone bearing hole steel bushing 6, differential axle bearing bore steel bushing 8, bearing of input shaft steel
Set 10 is the structures such as latticed or ladder-like with 1 faying face of alloy matrix aluminum.
Aluminum material main reducing gear of drive axle manufacture of casing of the present invention includes the following steps：1) it prepares
Steel bushing, and active processing is done to surface；2) it is fastened by bolts or other connection type assembling shell internal steel mold inserts 2；3)
Smelting aluminium alloy；4) aluminum alloy melt injection is installed in preheated steel bushing and mold insert mold；5) global formation；6) at T6 heat
Reason.
The present invention uses the design method of simulation of human body, is made not using the material of high intensity, high rigidity and high rigidity
After similar shape skeleton, spliced, is finally compounded on aluminium alloy ontology.Compared with the existing technology, steel aluminium of the present invention
Composite material main reducing gear of drive axle shell uses aluminium alloy ontology and structure optimization, can effectively mitigate final drive casing weight
Amount, loss of weight ratio is up to 40%.Simultaneously by reasonable Arrangement steel mold insert 2, bevel gear pair rigidity of support is improved.And inside is adopted
With steel aluminum compound structure, relative to aluminum alloy materials, local yielding intensity is increased to 355MPa or more by 206MPa.By limited
Meta analysis considers maximum input operating mode, can effectively reduce local maxima stress by reasonable Arrangement steel mold insert 2, make it below
Material yield strength, to ensure that the safety of lightweight aluminum material bevel housing.In addition, due to aluminium alloy
Material is different with the coefficient of thermal expansion of bearing outer ring material, causes contact at 1 bearing of alloy matrix aluminum to reduce, process is limited
First nonlinear contact analysis ensures the contact area between bearing outer ring and steel bushing by the design method of increase bearing steel bushing,
The possibility of circle is played to reduce bearing, while also ensuring the consistency of existing fit tolerance and original shell.Main deceleration
Bolt hole steel mold insert 12 is equipped with around device casing bolts hole, and bolt hole steel mold insert end face 13 is exposed in aluminium alloy ontology
On, it is directly contacted with bolt or other fasteners, ensure that the reliability of main gearbox assembly assembly.Steel mold insert 2 and aluminium close
1 faying face of auri body increases steel mold insert 2 and 1 contact area of alloy matrix aluminum using the structures such as latticed or ladder-like, improves
Bonding strength.In addition, the design method of shell application simulation of human body of the present invention, using high intensity, high rigidity and Gao Gang
After different shape skeleton is made in the material of degree, spliced, be finally compounded on aluminium alloy ontology, is closed to solve whole aluminium
The problems such as the golden strength of materials is insufficient, rigidity is on the weak side, assembly is unreliable.
It the above is only and the preferred embodiment of the present invention is described, technical scheme of the present invention is not limited to
This, those skilled in the art on the basis of the design of the major technique of the present invention made by any known deformation belong to the present invention
Claimed technology scope, the specific protection domain of the present invention are subject to the record of claims.
Claims (9)
1. a kind of aluminum material main reducing gear of drive axle shell, is combined by alloy matrix aluminum and steel mold insert, special
Sign is, includes tandem axles bevel housing, and the shell further includes having alloy matrix aluminum, steel skeleton, master
Axis of cone bearing bore steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing and bolt hole steel mold insert；
The main cone bearing hole steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing and bolt hole steel mold insert are set respectively
It is placed on alloy matrix aluminum.
2. a kind of aluminum material main reducing gear of drive axle shell, is combined by alloy matrix aluminum and steel mold insert, special
Sign is, includes non-through formula main reducing gear of drive axle shell, the shell further include have alloy matrix aluminum, steel skeleton,
Main cone bearing hole steel bushing, differential axle bearing bore steel bushing and bolt hole steel mold insert；
The steel skeleton, main cone bearing hole steel bushing, differential axle bearing bore steel bushing and bolt hole steel mold insert are respectively arranged at aluminium
On alloy substrate.
3. the aluminum material main reducing gear of drive axle shell as described in any one of claims 1 or 2, which is characterized in that
Further include having main cone bearing outer ring, bearing of input shaft outer ring；The main cone bearing outer ring, bearing of input shaft outer ring are distinguished interference and are matched
Combined pressure is become owner of on axis of cone bearing bore steel bushing and bearing of input shaft steel bushing, to be connected and fixed with alloy matrix aluminum.
4. the aluminum material main reducing gear of drive axle shell as described in any one of claims 1 or 2, which is characterized in that
Further include having cup, diff. side bearing；The cup, diff. side bearing is assemblied on differential axle bearing bore steel bushing, to be closed with aluminium
Auri body is connected and fixed.
5. the aluminum material main reducing gear of drive axle shell as described in any one of claims 1 or 2, which is characterized in that
It further include bevel housing bolt hole；Bolt hole steel mold insert, and bolt are equipped with around the bevel housing bolt hole
Hole steel mold insert end face is exposed on alloy matrix aluminum, is directly connect with bolt or other fasteners.
6. the aluminum material main reducing gear of drive axle shell as described in any one of claims 1 or 2, which is characterized in that
Main cone bearing hole steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing are all made of and the main cone bearing outer ring, differential mechanism
Bearing outer ring, the identical linear expansion material in bearing of input shaft outer ring are made.
7. aluminum material main reducing gear of drive axle shell as described in claim 1, which is characterized in that steel skeleton, master
Axis of cone bearing bore steel bushing, differential axle bearing bore steel bushing, bearing of input shaft steel bushing and alloy matrix aluminum faying face are latticed or ladder
The structures such as shape.
8. aluminum material main reducing gear of drive axle shell as claimed in claim 2, which is characterized in that steel skeleton, master
Axis of cone bearing bore steel bushing, differential axle bearing bore steel bushing and alloy matrix aluminum faying face are the structures such as latticed or ladder-like.
9. a kind of casting molding process of aluminum material driving bridge main reducing speed shell, it is characterised in that：
1) steel bushing is prepared, and active processing is done to surface；
2) it is fastened by bolts or other connection type assembling shell internal steel mold inserts；
3) smelting aluminium alloy；
4) aluminum alloy melt injection is installed in preheated steel bushing and mold insert mold；
5) global formation；
6) T6 is heat-treated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710145032.4A CN108571580A (en) | 2017-03-13 | 2017-03-13 | A kind of aluminum material main reducing gear of drive axle shell and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710145032.4A CN108571580A (en) | 2017-03-13 | 2017-03-13 | A kind of aluminum material main reducing gear of drive axle shell and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108571580A true CN108571580A (en) | 2018-09-25 |
Family
ID=63578231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710145032.4A Pending CN108571580A (en) | 2017-03-13 | 2017-03-13 | A kind of aluminum material main reducing gear of drive axle shell and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108571580A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112668097A (en) * | 2020-12-25 | 2021-04-16 | 中国第一汽车股份有限公司 | Simulation modeling method for axle and gear performance of passenger vehicle drive axle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6189413B1 (en) * | 1999-07-12 | 2001-02-20 | American Axle & Manufacturing, Inc. | Captive molding with dissimilar material insert |
| CN201457053U (en) * | 2009-09-23 | 2010-05-12 | 重庆隆旺机电有限责任公司 | Main reduction gearbox capable of being arranged on axle housing type rear axle |
| CN201494315U (en) * | 2009-09-22 | 2010-06-02 | 东风汽车公司 | Breaking type penetrating bridge main speed reducer |
| CN104999858A (en) * | 2015-07-21 | 2015-10-28 | *** | Light-weight hub made of steel-aluminum composite materials |
| CN205971494U (en) * | 2016-08-29 | 2017-02-22 | 安徽万安汽车零部件有限公司 | Mixed sub vehicle frame of steel aluminium |
-
2017
- 2017-03-13 CN CN201710145032.4A patent/CN108571580A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6189413B1 (en) * | 1999-07-12 | 2001-02-20 | American Axle & Manufacturing, Inc. | Captive molding with dissimilar material insert |
| CN201494315U (en) * | 2009-09-22 | 2010-06-02 | 东风汽车公司 | Breaking type penetrating bridge main speed reducer |
| CN201457053U (en) * | 2009-09-23 | 2010-05-12 | 重庆隆旺机电有限责任公司 | Main reduction gearbox capable of being arranged on axle housing type rear axle |
| CN104999858A (en) * | 2015-07-21 | 2015-10-28 | *** | Light-weight hub made of steel-aluminum composite materials |
| CN205971494U (en) * | 2016-08-29 | 2017-02-22 | 安徽万安汽车零部件有限公司 | Mixed sub vehicle frame of steel aluminium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112668097A (en) * | 2020-12-25 | 2021-04-16 | 中国第一汽车股份有限公司 | Simulation modeling method for axle and gear performance of passenger vehicle drive axle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11772479B2 (en) | Electric wheel assembly with integrated hub motor | |
| EP3326836B1 (en) | Lightweight hub made of aluminum-steel composite materials | |
| CN210970636U (en) | Transmission system of common-end cover electric drive assembly | |
| CN203344654U (en) | Weight reducing type back drive axle for electric vehicle | |
| CN108571580A (en) | A kind of aluminum material main reducing gear of drive axle shell and its manufacturing method | |
| CN104999858A (en) | Light-weight hub made of steel-aluminum composite materials | |
| CN204452025U (en) | A kind of rear driving axle for mating heavy-duty motor Minitype electric automobile | |
| CN207364235U (en) | A kind of speed changer with brake | |
| CN213685134U (en) | Engineering vehicle wheel side speed reducer and mining dump truck | |
| CN107662086A (en) | A kind of manufacture method of automotive door hinge | |
| CN104813075A (en) | Drive train device for a motor vehicle and production process for a drive train device | |
| CN207687315U (en) | A kind of driving rear axle monoblock type bevel housing assembly | |
| CN208069301U (en) | A kind of new-energy automobile Monobloc axle housing | |
| CN207128493U (en) | A kind of lightweight aluminum material wheel hub for commercial car | |
| CN209444436U (en) | Power transmission arrangment | |
| CN208024734U (en) | A kind of damping type transmission shaft connection plate | |
| CN207683243U (en) | All-terrain Forklift steering drive axle assembly | |
| US20170082186A1 (en) | Axle assembly | |
| CN105059113A (en) | Vehicle-bridge structure | |
| CN110733527B (en) | Bogie axle box applied to high-speed passenger train, aluminum alloy material and processing technology of aluminum alloy material | |
| CN201539532U (en) | Engine flywheel assembly | |
| CN211371207U (en) | Novel connection structure's lightweight differential mechanism casing | |
| CN217653188U (en) | Economical loader transaxle differential housing | |
| CN201030846Y (en) | Air-braking drum type braking front axle | |
| CN108099491A (en) | Rear wheel hub |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180925 |
|
| RJ01 | Rejection of invention patent application after publication |