CN109533260A - Screw shaft of ship commitments beam isolation structure device - Google Patents
Screw shaft of ship commitments beam isolation structure device Download PDFInfo
- Publication number
- CN109533260A CN109533260A CN201811378878.3A CN201811378878A CN109533260A CN 109533260 A CN109533260 A CN 109533260A CN 201811378878 A CN201811378878 A CN 201811378878A CN 109533260 A CN109533260 A CN 109533260A
- Authority
- CN
- China
- Prior art keywords
- ship
- clad
- isolation structure
- screw shaft
- commitments
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Support Of The Bearing (AREA)
Abstract
The present invention relates to a kind of screw shaft of ship commitments beam isolation structure devices, it is installed between ship stern bearing and axle housing, including be installed on the neck bush of screw shaft of ship bearing outer surface, be installed on the external bushing of axle housing inner surface and the clad being installed between neck bush and external bushing and perfusion layer, clad is installed on the outer surface of neck bush, and perfusion layer is installed between external bushing and clad；Clad and perfusion layer are using two different damp composite materials composition lamination damping structure.Constraint isolation structure device of the invention, can constrain the vibration at stern bearing, and paddle shaft system dynamic ex-citing forces are isolated by conduction of the stern bearing to Ship Structure, directly be conducted to hull to weaken shafting vibration by stern bearing；Clad and perfusion layer form lamination damping structure using different compositions, the damp composite material of thickness, are capable of forming the isolation structure of appropriate damping and rigidity, applied widely.
Description
Technical field
The present invention relates to marine shafting noise reduction technology fields, and in particular to a kind of screw shaft of ship commitments beam isolation structure
Device belongs to weak vibration precise controlling technology.
Background technique
As shipbuilding industry continues to develop, the requirement to its noise and vibration performance is higher and higher.The installation of ship stern bearing
It for bearing propeller, shafting weight of equipment is one of marine shafting important equipment in propeller front end.Ship stern bearing away from
Closer from propeller, propeller is generated biggish transversely excited by the excitation of uneven following wake field incoming flow, and the bearing is by transverse direction
It motivates and is conducted from the point to Ship Structure, form new radiating surface；Meanwhile bearing clearance is big, operation is big by fluctuation, than pressure
It is strong very high, and biggish bending deformation easily occurs in cantilever-shaped for tailing axle, thus be easy so that stern bearing in the axial direction with
Tailing axle contact is uneven, causes part bigger than pressing through, and " edge loading " phenomenon occurs so that between axis and stern bearing further without
Method forms good lubricating film, generates dry friction and viscous creeping phenomenon, generates friction self-excited vibration, and then generate whistle.It rubs
Wiping can also evoke the high modal density broader frequency spectrum radiation of hull stern, or even shafting or hull partial structurtes is caused to resonate.More than
Factor makes the main conduction channel for becoming shafting oscillation crosswise, stern bearing frictional vibration at stern bearing, and it is micro- to form naval vessel stern
Weak vibration, influences Stealth Fighter.
Domestic spot ship, which mainly passes through, to be selected high-performance, low friction " match dragon " class bush material or changes bearing bush structure shape
Formula improves stern bearing Frotteurism, and it is expected to reduce frictional vibration.But to the actual motion condition of a kind of ship, latent device,
The control of above scheme shaft oscillation crosswise produces little effect, in some instances it may even be possible to run counter to desire.Shafting transverse-vibration is reduced in order to integrate
Dynamic and conduction of the frictional vibration to hull, spy propose a kind of new vibration isolation technique scheme.
Summary of the invention
The technical problem to be solved in the present invention is that for above-mentioned marine shafting of the existing technology oscillation crosswise with
And because the frictional vibration that insufficient lubrication generates is directly conducted to Ship Structure through stern bearing between axis and stern bearing, and stern bearing with
It is mostly to be rigidly connected between hull, lacks effective isolation, be unfavorable for the deficiencies of ship stern integrally controls, a kind of ship is provided
Stern bearing constrains isolation structure device, it is installed between ship stern bearing and axle housing, for paddle shaft system dynamic exciting to be isolated
Power controls the low frequency radiation noise of ship by conduction of the stern bearing to Ship Structure, especially suitable for device Propulsion Systems of diving.
The present invention is technical solution used by solving technical problem set forth above are as follows:
A kind of screw shaft of ship commitments beam isolation structure device, the screw shaft of ship commitments beam isolation structure device are installed on ship
Between oceangoing ship stern bearing and axle housing, it includes the neck bush for being installed on screw shaft of ship bearing outer surface, is installed on the outer of axle housing inner surface
Bushing and the clad being installed between the neck bush and external bushing and perfusion layer, the clad are installed in described
The outer surface of bushing, the perfusion layer are installed between the external bushing and clad；The clad and perfusion layer use two
The different damp composite material of kind forms lamination damping structure.
In above scheme, the clad and perfusion layer use different epoxy resin-base composite materials, the clad
It is wrapped around the outer surface in neck bush and is heating and curing, the perfusion layer is poured between the external bushing and clad, warp
It is heating and curing after deaeration processing；Within the scope of -10-60 DEG C, the damping factor of clad and perfusion layer composite construction is not less than
0.25。
In above scheme, the clad uses galss fiber reinforced resin based damping composite material, and perfusion layer, which uses, to be added
Enter the damping epoxy resin of 40%400 mesh ultrafine quartz powders.
In above scheme, the screw shaft of ship commitments beam isolation structure device further includes sealant, the sealant solidification
At the both ends of the perfusion layer, the sealant is using anticorrosive, low water swelling and the swollen sealing material of low-heat, to the perfusion layer
It is protected.
In above scheme, the neck bush outer surface is provided with wedge-shaped transition close to end positions to prevent the sealant
It falls off.
In above scheme, the neck bush inner surface and stern tube shaft bearing outer surface are interference fitted, and the neck bush inner surface is set
There is the concave surface matched with the stern tube shaft bearing outer surface shaft shoulder, axially position when for stern bearing interference installation.
In above scheme, the external bushing outer surface and axle housing inner surface are interference fitted, and the external bushing outer surface is equipped with
The shaft shoulder matched with axle housing inner surface, axially position when for screw shaft of ship commitments beam isolation structure device installation.
In above scheme, the neck bush outer surface is equipped with several swallow-tail form annular grooves, the clad inner surface and liner
Set outer surface and annular groove fit closely.
In above scheme, the external bushing inner surface is equipped with several swallow-tail form annular grooves, the perfusion layer outer surface and outer lining
Set inner surface and annular groove fit closely.
The beneficial effects of the present invention are:
1, constraint isolation structure device is installed additional between ship stern bearing and Ship Structure, it can be to the vibration at stern bearing
It is constrained, and paddle shaft system dynamic ex-citing forces is isolated by conduction of the stern bearing to Ship Structure, to weaken shafting vibration
It is directly conducted to hull by stern bearing；
2, clad and perfusion layer form lamination damping structure using different compositions, the damp composite material of thickness, this
Structure has better mechanical property and broader effective damping temperature range, is capable of forming the isolation structure of appropriate damping and rigidity,
It is applied widely；
3, the configuration of the present invention is simple, high reliablity, versatility are good.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of screw shaft of ship commitments beam isolation structure device of the present invention；
Fig. 2 is enlarged drawing at the A of the beam isolation structure device of screw shaft of ship commitments shown in Fig. 1；
Fig. 3 is the schematic view of the mounting position of screw shaft of ship commitments beam isolation structure device of the present invention.
In figure: 10, screw shaft of ship commitments beam isolation structure device；1, neck bush；2, external bushing；3, clad；4, it is perfused
Layer；5, sealant；20, stern bearing；30, axle housing；40, Ship Structure.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
As shown in Figure 1-3, being a preferred embodiment of the present invention screw shaft of ship commitments beam isolation structure device 10, it is installed
Between ship stern bearing 20 and Ship Structure 40, pass through stern bearing 20 to hull knot for paddle shaft system dynamic ex-citing forces to be isolated
The conduction of structure 40 controls the low frequency radiation noise of ship, especially suitable for device Propulsion Systems of diving.Since stern bearing 20 cannot be straight
It connects and is mounted in the Ship Structure of tail portion, generally there is 30 transition of axle housing, axle housing 30 is welded in the Ship Structure of tail portion, ship of the present invention
Stern bearing constraint isolation structure device 10 is installed between ship stern bearing 20 and axle housing 30.
Screw shaft of ship commitments beam isolation structure device 10 of the present invention includes the liner for being installed on 20 outer surface of ship stern bearing
Set 1, the clad 3 for being installed on the external bushing 2 of 30 inner surface of axle housing and being installed between neck bush 1 and external bushing 2 and perfusion
Layer 4, clad 3 are installed on the outer surface of neck bush 1, and perfusion layer 4 is installed between external bushing 2 and clad 3.3 He of clad
Layer 4 is perfused and uses two different damp composite materials, forms lamination damping structure, this structure has better mechanical property
With broader effective damping temperature range.Screw shaft of ship commitments beam isolation structure device 10 carries out the shafting vibration that stern bearing 20 conducts
Isolation and decaying reduce the biography of the frictional vibration that generates between shafting oscillation crosswise and axis and bearing by insufficient lubrication to hull
It leads.
It advanced optimizes, in the present embodiment, clad 3 and perfusion layer 4 use different epoxy resin-base composite materials, tool
Body, clad 3 uses galss fiber reinforced resin based damping composite material, is wrapped around in the outer surface of neck bush 1, whole
It is heated to 50 DEG C and 2h is kept to be solidified, be then heated to 60 DEG C of solidifications for 24 hours.It is ultra-fine using 40%400 mesh are added that layer 4 is perfused
The damping epoxy resin of silica flour, is poured between external bushing 2 and clad 3, and the inward at both ends of perfusion layer 4 extends to form U-shaped
Groove accommodates clad 3 wherein, after deaeration is handled, is integrally heated to 50 DEG C and 48h is kept to be solidified.At -10-60 DEG C
In range, the damping factor of clad 3 and perfusion 4 composite construction of layer is not less than 0.25.The thickness choosing of clad 3 and perfusion layer 4
It takes related with the composition for the epoxy resin-base composite material that clad 3 and perfusion layer 4 are selected and moulding process.By repeatedly trying
It tests, clad 3 takes 3:2 proper with perfusion 4 thickness ratio of layer, and 3 thickness of clad takes 15mm in the present embodiment, and perfusion layer 4 is thick
Degree takes 10mm.
Clad 3 and perfusion layer 4 have Low rigidity, high damping characteristic, are the key that vibration isolation, by changing the two material
Composition, moulding process and thickness can form the stern bearing constraint isolation structure device of different damping and rigidity, can effectively decline
Subtract vibration transmitting energy at this, bear vibration at this is isolated and is conducted to hull.It tests by contrast, installs stern bearing additional and constrain isolation junction
After structure device, lateral body vibration acceleration insertion loss >=5dB (10Hz~2kHz), effect is obvious.
It advanced optimizes, in the present embodiment, screw shaft of ship commitments beam isolation structure device 10 further includes sealant 5, perfusion
After 4 solidification of layer, be sealed processing at perfusion 4 both ends of layer, formation sealant 5, sealant 5 select anticorrosive, low water swelling with it is low
The sealing material of heat expansion, such as epoxy resin-base composite material protect perfusion layer 4.
It advanced optimizes, in the present embodiment, 1 outer surface of neck bush is provided with wedge-shaped transition close to end positions to enhance
The shear strength of sealant 5 prevents sealant 5 from falling off.
It advanced optimizes, in the present embodiment, 1 inner surface of neck bush and 20 outer surface of stern bearing are interference fitted, the present embodiment
In installed for convenience of stern bearing 20, neck bush 1 and 20 contact surface of stern bearing are designed as small two sizes of the big stern of bow, install stern bearing
Enter when 20 from bow end.1 inner surface of neck bush is equipped with the concave surface matched with the 20 outer surface shaft shoulder of stern bearing, facilitates installation stern tube shaft
Axially position is carried out when holding 20.
It advanced optimizes, in the present embodiment, 2 outer surface of external bushing and 30 inner surface of axle housing are interference fitted, 2 appearance of external bushing
Face is equipped with the shaft shoulder matched with 30 inner surface of axle housing, axially fixed when installing for screw shaft of ship commitments beam isolation structure device 10
Position.
Advanced optimize, in the present embodiment, 1 outer surface of neck bush is set there are two swallow-tail form annular groove, 3 inner surface of clad with
1 outer surface of neck bush and annular groove are fitted closely to enhance the shear strength of clad 3, prevent it de- when for solidifying clad 3
It falls.
It advanced optimizes, in the present embodiment, 2 inner surface of external bushing also is provided with two swallow-tail form annular grooves, and 4 outer surface of layer is perfused
It fits closely with external bushing inner surface and annular groove to enhance and 4 shear strength of layer is perfused, prevents it de- when layer 4 is perfused for solidifying
It falls.
The beneficial effect of screw shaft of ship commitments beam isolation structure device 10 of the present invention is:
1, between ship stern bearing 20 and Ship Structure 40 install additional constraint isolation structure device, can be to stern bearing at
Vibration is constrained, and paddle shaft system dynamic ex-citing forces are isolated by conduction of the stern bearing to Ship Structure, to weaken shafting
Vibration is directly conducted to hull by stern bearing 20；
2, clad 3 and perfusion layer 4 be using different compositions, the damp composite material of thickness, be capable of forming appropriate damping and
The isolation structure of rigidity, it is applied widely；
3, the configuration of the present invention is simple, high reliablity, versatility are good.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (9)
1. a kind of screw shaft of ship commitments beam isolation structure device, which is characterized in that the screw shaft of ship commitments beam isolation structure dress
It sets and is installed between ship stern bearing and axle housing, it includes the neck bush for being installed on screw shaft of ship bearing outer surface, is installed on axle housing
The external bushing of inner surface and the clad being installed between the neck bush and external bushing and perfusion layer, the clad peace
Outer surface loaded on the neck bush, the perfusion layer are installed between the external bushing and clad；The clad and filling
It infuses layer and forms lamination damping structure using two different damp composite materials.
2. screw shaft of ship commitments beam isolation structure device according to claim 1, which is characterized in that the clad and filling
It infuses layer and uses different epoxy resin-base composite materials, the clad is wrapped around the outer surface in neck bush and heats solid
Change, the perfusion layer is poured between the external bushing and clad, is heating and curing after deaeration is handled；In -10-60 DEG C of ranges
Interior, the damping factor of clad and perfusion layer composite construction is not less than 0.25.
3. screw shaft of ship commitments beam isolation structure device according to claim 2, which is characterized in that the clad uses
Galss fiber reinforced resin based damping composite material, perfusion layer is using the damping asphalt mixtures modified by epoxy resin that 40%400 mesh ultrafine quartz powders are added
Rouge.
4. screw shaft of ship commitments beam isolation structure device according to claim 1, which is characterized in that the ship stern bearing
Constraining isolation structure device further includes sealant, and the sealant is solidificated in the both ends of the perfusion layer, and the sealant uses
Anticorrosive, low water swelling and the swollen sealing material of low-heat, protect the perfusion layer.
5. screw shaft of ship commitments beam isolation structure device according to claim 4, which is characterized in that the neck bush appearance
Face is provided with wedge-shaped transition close to end positions to prevent the sealant from falling off.
6. screw shaft of ship commitments beam isolation structure device according to claim 1, which is characterized in that table in the neck bush
Face and stern tube shaft bearing outer surface are interference fitted, and the neck bush inner surface is equipped with the concave surface matched with the stern tube shaft bearing outer surface shaft shoulder,
Axially position when for stern bearing interference installation.
7. screw shaft of ship commitments beam isolation structure device according to claim 1, which is characterized in that the external bushing appearance
Face and axle housing inner surface are interference fitted, and the external bushing outer surface is equipped with the shaft shoulder matched with axle housing inner surface, for described
Axially position when screw shaft of ship commitments beam isolation structure device is installed.
8. screw shaft of ship commitments beam isolation structure device according to claim 1, which is characterized in that the neck bush appearance
Face is equipped with several swallow-tail form annular grooves, and the clad inner surface is fitted closely with neck bush outer surface and annular groove.
9. screw shaft of ship commitments beam isolation structure device according to claim 1, which is characterized in that table in the external bushing
Face is equipped with several swallow-tail form annular grooves, and the perfusion layer outer surface is fitted closely with external bushing inner surface and annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378878.3A CN109533260B (en) | 2018-11-19 | 2018-11-19 | Ship stern bearing restraint isolation structure device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378878.3A CN109533260B (en) | 2018-11-19 | 2018-11-19 | Ship stern bearing restraint isolation structure device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109533260A true CN109533260A (en) | 2019-03-29 |
| CN109533260B CN109533260B (en) | 2021-05-28 |
Family
ID=65848381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811378878.3A Active CN109533260B (en) | 2018-11-19 | 2018-11-19 | Ship stern bearing restraint isolation structure device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109533260B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228449A (en) * | 2020-10-15 | 2021-01-15 | 重庆大学 | Variable-rigidity intelligent water-lubricated bearing and power transmission system thereof |
| WO2022095198A1 (en) * | 2020-11-06 | 2022-05-12 | 江龙船艇科技股份有限公司 | Dual-purpose device for preventing shaft system thordon from deforming and cooling |
| CN115059732A (en) * | 2022-07-13 | 2022-09-16 | 中国舰船研究设计中心 | Stern bearing vibration reduction structure for reducing transverse vibration of ship shafting and design method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1958707A (en) * | 2006-11-13 | 2007-05-09 | 武汉理工大学 | Damp embedding glue of epoxy resin |
| CN101704313A (en) * | 2009-09-22 | 2010-05-12 | 中国船舶重工集团公司第七二五研究所 | Structural high-damping fiber-reinforced composite |
| CN102179978A (en) * | 2011-02-15 | 2011-09-14 | 中国船舶重工集团公司第七二五研究所 | Sandwich damping composite material |
| CN103321853A (en) * | 2013-04-12 | 2013-09-25 | 太原科技大学 | Method for restraining wind turbine blade adopting compound damping structure from vibrating |
| CN107628218A (en) * | 2017-09-08 | 2018-01-26 | 中国船舶重工集团公司第七〇九研究所 | A kind of stern bearing cast damping unit and preparation method |
| CN207328801U (en) * | 2017-08-16 | 2018-05-08 | 中国船舶重工集团公司第七一九研究所 | A kind of intermediate bearing automatic centring device |
-
2018
- 2018-11-19 CN CN201811378878.3A patent/CN109533260B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1958707A (en) * | 2006-11-13 | 2007-05-09 | 武汉理工大学 | Damp embedding glue of epoxy resin |
| CN101704313A (en) * | 2009-09-22 | 2010-05-12 | 中国船舶重工集团公司第七二五研究所 | Structural high-damping fiber-reinforced composite |
| CN102179978A (en) * | 2011-02-15 | 2011-09-14 | 中国船舶重工集团公司第七二五研究所 | Sandwich damping composite material |
| CN103321853A (en) * | 2013-04-12 | 2013-09-25 | 太原科技大学 | Method for restraining wind turbine blade adopting compound damping structure from vibrating |
| CN207328801U (en) * | 2017-08-16 | 2018-05-08 | 中国船舶重工集团公司第七一九研究所 | A kind of intermediate bearing automatic centring device |
| CN107628218A (en) * | 2017-09-08 | 2018-01-26 | 中国船舶重工集团公司第七〇九研究所 | A kind of stern bearing cast damping unit and preparation method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228449A (en) * | 2020-10-15 | 2021-01-15 | 重庆大学 | Variable-rigidity intelligent water-lubricated bearing and power transmission system thereof |
| WO2022095198A1 (en) * | 2020-11-06 | 2022-05-12 | 江龙船艇科技股份有限公司 | Dual-purpose device for preventing shaft system thordon from deforming and cooling |
| CN115059732A (en) * | 2022-07-13 | 2022-09-16 | 中国舰船研究设计中心 | Stern bearing vibration reduction structure for reducing transverse vibration of ship shafting and design method |
| CN115059732B (en) * | 2022-07-13 | 2024-01-26 | 中国舰船研究设计中心 | Stern bearing vibration reduction structure for reducing transverse vibration of ship shafting and design method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109533260B (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109533260A (en) | Screw shaft of ship commitments beam isolation structure device | |
| CN105620693B (en) | A kind of carbon fiber polymer composite compressive cabin and its manufacture craft | |
| US20100218377A1 (en) | Hybrid composite journal bearing and manufacturing method thereof | |
| US9935519B2 (en) | Cooling jacket | |
| US5108262A (en) | High damping flexible propeller/impleller | |
| HRP20090645T1 (en) | Rudder for ships | |
| CN106903948B (en) | A kind of strain monitoring two dimension wound composite submarine navigation device shell and preparation method thereof | |
| CN105674040B (en) | A kind of space flight spherical composite material pressure container of equator flange installation | |
| JP6271578B2 (en) | Component comprising metal matrix reinforcing member and method for forming the same | |
| CN105121137B (en) | Method for the compound frame of motor and for manufacturing it | |
| Zhang et al. | Design and dynamic analysis of low-frequency mounting system for marine thrust bearing | |
| Zechao et al. | Optimization design of resonance changer for marine propulsion shafting in longitudinal vibration | |
| CN111775511B (en) | Integrated bullet structure formed by composite filling dot matrix interlayer | |
| RU2640910C2 (en) | Vessel propulsor | |
| CN104154908B (en) | A kind of high stable, impact resisting vibrating liquid floated gyroscope Floater Structure peculiar to vessel | |
| CN214837333U (en) | Seal structure of leading pump case | |
| CN213566422U (en) | Cooling system of power device for ship | |
| CN109736975B (en) | Spray pipe capable of reducing temperature of outer wall of expansion section and design method thereof | |
| JP3466019B2 (en) | Void filling structure between hull and sonar dome | |
| CA3162743A1 (en) | Marine wake adapted rudder assembly | |
| JPH0875596A (en) | Stinger for wind tunnel test | |
| JPH0791433A (en) | Propeller shaft and its manufacture | |
| Ko et al. | A study on the application of new lining material for ship propulsion shafting system | |
| CN210957956U (en) | Large-scale motor retaining ring with high strength and high precision | |
| CN208331052U (en) | Automobile brake drum |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |