CN106709097A - Simulation analysis method, device and system of bearing lubricating oil flow - Google Patents
Simulation analysis method, device and system of bearing lubricating oil flow Download PDFInfo
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- CN106709097A CN106709097A CN201510778103.5A CN201510778103A CN106709097A CN 106709097 A CN106709097 A CN 106709097A CN 201510778103 A CN201510778103 A CN 201510778103A CN 106709097 A CN106709097 A CN 106709097A
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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Abstract
An embodiment of the invention discloses a simulation analysis method, device and system of bearing lubricating oil flow. The method includes: calculating a relative lubricating oil pressure value at a bearing inlet according to a preset bearing environment pressure value and a lubricating oil pressure value, obtained through simulation analysis, of a main oil channel; calculating a lubricating oil flow value formed along with bearing inlet lubricating oil pressure change according to the relative lubricating oil pressure value at the bearing inlet and a preset lubricating oil flow value formed by bearing inlet lubricating oil pressure; calculating a total lubricating oil flow value of a bearing according to the lubricating oil flow value formed along with the bearing inlet lubricating oil pressure change and a preset lubricating oil flow value formed by the rotation and extrusion of the bearing so as to obtain the total lubricating oil flow feature curve of the bearing to conveniently perform simulation analysis on the bearing lubricating oil flow on the basis of feature curve. By the simulation analysis method, the feature input of bearing lubricating oil can be defined accurately, the input boundary of simulation analysis is perfected, and analysis precision is increased greatly.
Description
Technical field
The invention belongs to mechanical field, more particularly to a kind of simulating analysis of bearing oil flow,
Apparatus and system.
Background technology
Lubricating system is the important component of engine, and bearing is the critical component of engine work, lubrication
System needs to provide enough flow of lubrication for bearing to ensure the normal work of bearing, so as to ensure to start
The normal power output of machine.Engine work when, the bearing element of all kinds of bearing loads, including base bearing and
The connecting-rod bearing, because of the versus high motion between bearing friction pair, working surface can wear and tear rapidly；Rub simultaneously
High heat produced by wiping can melt part time job surface, cause bearing ablation, damage, and serious meeting causes
Toggle is damaged, scrapped, and causes engine to run well.Therefore bearing normal work is ensured
Flow of lubrication, be ensure normal working of engine necessary condition.Good bearing lubrication can enter one
Step reduces frictional resistance, reduces power attenuation, mitigates abrasion, increasing service life of engine.
In engine development process, bearing lubrication ability be engine design emphasis, design the initial stage just
Determine the primary structure and flow of lubrication of bearing.And the size of bearing oil flow, and can meet
Bearing demand, it is necessary to compare the result of engine reliability test to check.But now not only modification difficulty is big,
And development progress and cost can be had a strong impact on.Therefore current some full-sized car companies both at home and abroad are using imitative
The analysis method of true simulation, in design early stage simulation bearing lubrication working condition, calculating is set based on bearing arrangement
The flow of lubrication demand of meter.So the precision of bearing oil Traffic simulation analysis, to reducing and eliminating examination
Bearing fault risk in testing, plays key effect.
Existing simulating analysis only considered the parameter in terms of bearing arrangement, and these parameters are fixed
, do not change with the change of environmental condition or lubricant parameter.And in the work of real engine, ring
Border condition or lubricant parameter are to change with engine speed/load and change.Therefore existing bearing moistens
The bearing oil flow accuracy that oil flow simulating analysis are calculated is relatively low, to what is designed and test
Directiveness is poor, it is difficult to eliminate bearing fault risk.
The content of the invention
The embodiment of the present invention technical problem to be solved is：A kind of emulation of bearing oil flow is provided
Analysis method, apparatus and system, to improve the accuracy of bearing oil flow analysis.
A kind of one side according to embodiments of the present invention, there is provided simulation analysis side of bearing oil flow
Method, including：The lubricating oil pressure of ambient value and simulation analysis main oil gallery according to bearing set in advance
Value, the lubricating oil relative pressure of calculation bearing entrance；Lubricating oil relative pressure according to bearing inlets and
It is set in advance because bearing inlets lubricating oil pressure formed flow of lubrication value, calculate with bearing inlets lubricate
Oil pressure changes the flow of lubrication value to be formed；Change the lubrication to be formed according to bearing inlets lubricating oil pressure
Oily flow value and it is set in advance because bearing rotary and extruding formed flow of lubrication value, calculation bearing it is total
Flow of lubrication value, so that total flow of lubrication characteristic curve of bearing is obtained, to be based on total lubrication
Hydraulic flow characteristics curve carries out the simulation analysis of bearing oil flow.
Method according to embodiments of the present invention, also includes：According to bearing tachometer value set in advance, by axle
Forward speed with because bearing inlets lubricating oil pressure formed flow of lubrication characteristic curve, obtain it is corresponding because
The flow of lubrication value that bearing inlets lubricating oil pressure is formed；According to bearing tachometer value set in advance, pass through
Bearing rotating speed and the curve because of bearing rotary and the flow of lubrication characteristic of extruding formation, obtain corresponding because of axle
Hold the flow of lubrication value that rotation and extruding are formed.
Method according to embodiments of the present invention, ambient value and emulation point according to bearing set in advance
The lubrication pressure force value of main oil gallery is analysed, the lubricating oil relative pressure of calculation bearing entrance is to preset
The lubrication pressure force value of simulation analysis main oil gallery subtract the ambient value of bearing set in advance；According to axle
Hold entrance lubricating oil relative pressure and it is set in advance because bearing inlets lubricating oil pressure formed lubrication
Oily flow value, calculating changes the flow of lubrication value to be formed with bearing inlets lubricating oil pressure, is to set in advance
Fixed presses because the flow of lubrication value of bearing inlets lubricating oil pressure formation is relative with the lubricating oil of bearing inlets
Force value is multiplied；According to changing the flow of lubrication value to be formed and set in advance with bearing inlets lubricating oil pressure
Because of the flow of lubrication value that bearing rotary and extruding are formed, total flow of lubrication value of calculation bearing, being will be pre-
First set because bearing rotary and extruding formed flow of lubrication value with bearing inlets lubricating oil pressure become
Change the flow of lubrication value for being formed to be added.
A kind of other side according to embodiments of the present invention, there is provided the simulation analysis dress of bearing oil flow
Put, including：First controller unit, for the ambient value according to bearing set in advance and emulation point
Analyse the lubrication pressure force value of main oil gallery, the lubricating oil relative pressure of calculation bearing entrance；Second controller list
Unit, for the lubricating oil relative pressure according to bearing inlets and set in advance because of bearing inlets lubrication pressure
The flow of lubrication value that power is formed, calculating changes the flow of lubrication to be formed with bearing inlets lubricating oil pressure
Value；3rd controller unit, the flow of lubrication to be formed is changed for basis with bearing inlets lubricating oil pressure
Value and it is set in advance because bearing rotary and extruding formed flow of lubrication value, total lubricating oil of calculation bearing
Flow value, so that total flow of lubrication characteristic curve of bearing is obtained, to be based on total flow of lubrication
Characteristic curve carries out the simulation analysis of bearing oil flow.
Device according to embodiments of the present invention, also includes：4th controller unit, sets in advance for basis
Fixed bearing tachometer value, by bearing rotating speed and the flow of lubrication spy because of the formation of bearing inlets lubricating oil pressure
Property curve, obtain it is corresponding because bearing inlets lubricating oil pressure formed flow of lubrication value；5th control
Device unit, for according to bearing tachometer value set in advance, by bearing rotating speed and because of bearing rotary and extruding
The curve of the flow of lubrication characteristic of formation, obtain it is corresponding because bearing rotary and extruding formed lubricating oil stream
Value.
Device according to embodiments of the present invention, first controller unit is with emulation point set in advance
The lubrication pressure force value for analysing main oil gallery subtracts the ambient value of bearing set in advance, obtains bearing inlets
Lubricating oil relative pressure；The second controller unit is because of bearing inlets lubrication pressure by set in advance
The flow of lubrication value that power is formed is multiplied with the lubricating oil relative pressure of bearing inlets, obtains with bearing inlets
Lubricating oil pressure changes the flow of lubrication value to be formed；The second controller unit be by it is set in advance because
Flow of lubrication value and change the profit to be formed with bearing inlets lubricating oil pressure that bearing rotary and extruding are formed
Oil flow value is added, and obtains total flow of lubrication value of bearing.
A kind of another aspect according to embodiments of the present invention, there is provided simulation analysis system of bearing oil flow
System, including：The simulation analysis device of above-mentioned bearing oil flow.
Based on simulating analysis, the apparatus and system of bearing oil flow provided in an embodiment of the present invention,
At least there are following advantages：The present invention can be input into the characteristic of accurate definition bearing oil, improve emulation point
The input border of analysis, greatly improves analysis precision, while by the way of curve definitions flow of lubrication,
The characteristic of input can be easily changed, the Simulation Application of each discharge capacity type and bearing is met.
Brief description of the drawings
Fig. 1 is the schematic diagram of the simulating analysis of bearing oil flow of the present invention.
Fig. 2 is the schematic diagram of the simulation analysis device of inventive engine bearing oil flow.
Fig. 3 A and Fig. 3 B are the curve maps of present invention reaction bearing rotating speed and bearing lubrication hydraulic flow characteristics.
Specific embodiment
Further to illustrate the present invention to reach technological means and effect that predetermined goal of the invention is taken, with
Lower combination accompanying drawing and preferred embodiment, the emulation point to being lubricated according to a kind of engine bearing proposed by the present invention
Analysis input method and device its specific embodiment, step, structure, feature and its effect are described in detail.
Existing simulating analysis are that bearing element is defined using the single module in software, structure letter
Single, input is less, and the precision of analysis is relatively low.Existing bearing lubrication simulation analysis mainly use fluid soft
Special module in part represents bearing element, input content including bearing rotating speed, size and bearing clearance etc.,
The parameter for analyzing input is less, and without the parameter of reflection bearing oil flow behavior, therefore calculate
Bearing oil flow has notable difference with actual working state.
Realize it is of the invention during, the inventors discovered that：Because simulation analysis of computer is true engine
The Mathematical Modeling of real physical state, will make simulation analysis accurate, have contrast with reference to property with result of the test, must
The border that must analyze bearing oil Traffic simulation is consistent with real bearing lubrication state.
Refer to shown in Fig. 1, be the schematic diagram of the simulating analysis of bearing oil flow of the present invention.This
The simulating analysis of invention bearing oil flow include：Environment pressures of the S101 according to bearing set in advance
The lubrication pressure force value of force value and simulation analysis main oil gallery, the lubricating oil relative pressure of calculation bearing entrance；
S102 is according to the lubricating oil relative pressure of bearing inlets and set in advance because of bearing inlets lubricating oil pressure
The flow of lubrication value of formation, calculating changes the flow of lubrication value to be formed with bearing inlets lubricating oil pressure,
That is bearing pressure flow；S103 according to change with bearing inlets lubricating oil pressure the flow of lubrication value to be formed and
It is set in advance because bearing rotary and extruding formed flow of lubrication value, i.e., bearing rotary flow and extruding flow
Amount, total flow of lubrication value of calculation bearing, so that total flow of lubrication characteristic curve of bearing is obtained, with
Just the simulation analysis of bearing oil flow are carried out based on total flow of lubrication characteristic curve.
As shown in figure 1, the simulating analysis of bearing oil flow of the present invention also include：S104 is according to pre-
The bearing tachometer value for first setting, by bearing rotating speed and the lubricating oil stream because of the formation of bearing inlets lubricating oil pressure
The curve of flow characteristic, obtains corresponding because of the flow of lubrication value of bearing inlets lubricating oil pressure formation, such as schemes
Shown in 3A；S105 and by bearing rotating speed and because of bearing rotary squeeze according to bearing tachometer value set in advance
Swaging into flow of lubrication characteristic curve, obtain it is corresponding because bearing rotary and extruding formed lubricating oil
Flow value, as shown in Figure 3 B.
Wherein, S101 is to subtract to preset with the lubrication pressure force value of simulation analysis main oil gallery set in advance
Bearing ambient value, its operational formula is：Lubrication pressure force value-ambient value=the axle of main oil gallery
Hold the lubricating oil relative pressure of entrance；S102 is because bearing inlets lubricating oil pressure is formed by set in advance
Flow of lubrication value be multiplied with the lubricating oil relative pressure of bearing inlets, its operational formula is：Bearing enters
The flow of lubrication value that the lubricating oil relative pressure * of mouth is formed by bearing inlets lubricating oil pressure=with bearing
Entrance lubricating oil pressure changes the flow of lubrication value to be formed；S103 be by it is set in advance because of bearing rotary and
Extrude the flow of lubrication value of formation and change the flow of lubrication value to be formed with bearing inlets lubricating oil pressure
It is added, its operational formula is：Change the flow of lubrication value to be formed+because of axle with bearing inlets lubricating oil pressure
Hold flow of lubrication value=total flow of lubrication value that rotation and extruding are formed.
Refer to shown in Fig. 2, be the schematic diagram of the simulation analysis device of bearing oil flow of the present invention.This
The simulation analysis device of the bearing oil flow of invention includes：First controller unit 1, second controller
The controller unit 3 of unit 2 and the 3rd；First controller unit 1 is used for the ring according to bearing set in advance
The lubrication pressure force value of border pressure value and simulation analysis main oil gallery, the lubricating oil relative pressure of calculation bearing entrance
Value；Second controller unit 2 be used for according to the lubricating oil relative pressure of bearing inlets and it is set in advance because
The flow of lubrication value that bearing inlets lubricating oil pressure is formed, calculates and changes shape with bearing inlets lubricating oil pressure
Into flow of lubrication value；3rd controller unit 3 is used to change shape according to bearing inlets lubricating oil pressure
Into flow of lubrication value and it is set in advance because bearing rotary and extruding formed flow of lubrication value, calculate
Total flow of lubrication value of bearing, so that total flow of lubrication characteristic curve of bearing is obtained, to be based on
Stating total flow of lubrication characteristic curve carries out the simulation analysis of bearing oil flow.
As shown in Fig. 2 the simulation analysis device of bearing oil flow of the invention also includes：4th control
The controller unit 5 of device unit 4 and the 5th；4th controller unit 4 is used to be turned according to bearing set in advance
Speed value, the curve of the flow of lubrication characteristic by bearing rotating speed and because of the formation of bearing inlets lubricating oil pressure,
Obtain corresponding because of the flow of lubrication value of bearing inlets lubricating oil pressure formation；5th controller unit 5 is used
According to bearing tachometer value set in advance, by bearing rotating speed and the lubrication because of bearing rotary and extruding formation
The curve of hydraulic flow characteristics, obtain it is corresponding because bearing rotary and extruding formed flow of lubrication value.
Wherein, first controller unit is with the lubricating oil pressure of simulation analysis main oil gallery set in advance
Value subtracts the ambient value of bearing set in advance, obtains the lubricating oil relative pressure of bearing inlets；Institute
It is because of the flow of lubrication of bearing inlets lubricating oil pressure formation by set in advance to state second controller unit
Value is multiplied with the lubricating oil relative pressure of bearing inlets, obtains changing to be formed with bearing inlets lubricating oil pressure
Flow of lubrication value；The second controller unit is because bearing rotary and extruding are formed by set in advance
Flow of lubrication value with change the flow of lubrication value to be formed with bearing inlets lubricating oil pressure and be added, obtain
Total flow of lubrication value of bearing.
Present invention additionally comprises：6th controller unit 6 is used for the bearing tachometer value for setting, bearing rotating speed be with
Engine speed changes and changes, and reflects that the rotating speed of bearing becomes ginseng；7th controller unit 7 is used for what is set
The ambient value of bearing, example environmental pressure is 1bar；Signal branching unit 8 is used for the 6th controller list
The bearing tachometer value of the definition of unit 6 is delivered to the 4th controller unit 4 and the 5th controller unit 5 respectively；The
Nine controller units 9 are used for the lubrication pressure force value of simulation analysis main oil gallery set in advance.
The present invention is changed bearing rotating speed, lubricating oil with rotating speed and inlet pressure by each controller unit
Discharge characteristic is introduced into bearing lubrication system global analysis, and the bearing oil flow for being calculated is close actual,
Compare accurate, can be used for the evaluation of bearing failure risk in advance.
The present invention is analyzed suitable for the flow of lubrication of whole bearing types of automobile engine, including main shaft
Hold, the connecting-rod bearing etc., it in input except having preset bearing rotating speed, ambient value and emulation point
The lubrication pressure force value of main oil gallery is analysed, bearing rotating speed has also been preset and because of bearing inlets lubricating oil pressure shape
Into the curve of flow of lubrication characteristic, bearing rotating speed and the flow of lubrication formed by bearing rotary and extruding
The curve of characteristic, can analyze the bearing oil flow of the different operating modes changed with rotating speed and inlet pressure.
Simultaneously using the definition mode of flow curve, can be adjusted according to type and bearing arrangement change, can be with
Carry out the analysis and research of polymorphic type and many condition.
In addition, present invention also offers a kind of simulation analysis system of bearing oil flow including above-mentioned
Bearing oil flow simulation analysis device.
Although the present invention is disclosed above with preferred embodiment, present invention implementation is so not limited to
Scope, the simple equivalence changes made according to claims of the present invention and description with repair
Decorations, still fall within the range of technical solution of the present invention.
Claims (7)
1. a kind of simulating analysis of bearing oil flow, it is characterised in that including：
The lubrication pressure force value of ambient value and simulation analysis main oil gallery according to bearing set in advance, meter
Calculate the lubricating oil relative pressure of bearing inlets；
Lubricating oil relative pressure according to bearing inlets and set in advance because of bearing inlets lubricating oil pressure
The flow of lubrication value of formation, calculating changes the flow of lubrication value to be formed with bearing inlets lubricating oil pressure；
According to changing the flow of lubrication value to be formed and set in advance because of axle with bearing inlets lubricating oil pressure
Hold the flow of lubrication value that rotation and extruding are formed, total flow of lubrication value of calculation bearing, so as to obtain axle
The total flow of lubrication characteristic curve for holding, bearing profit is carried out to be based on total flow of lubrication characteristic curve
The simulation analysis of oil flow.
2. method according to claim 1, it is characterised in that also include：
According to bearing tachometer value set in advance, by bearing rotating speed with formed because of bearing inlets lubricating oil pressure
Flow of lubrication characteristic curve, obtain it is corresponding because bearing inlets lubricating oil pressure formed lubricating oil stream
Value；
According to bearing tachometer value set in advance, by bearing rotating speed and the profit because of bearing rotary and extruding formation
The curve of oil flow characteristic, obtain it is corresponding because bearing rotary and extruding formed flow of lubrication value.
3. method according to claim 1, it is characterised in that
The lubrication pressure force value of ambient value and simulation analysis main oil gallery according to bearing set in advance, meter
The lubricating oil relative pressure of bearing inlets is calculated, is with the lubrication pressure of simulation analysis main oil gallery set in advance
Force value subtracts the ambient value of bearing set in advance；
Lubricating oil relative pressure according to bearing inlets and set in advance because of bearing inlets lubricating oil pressure
The flow of lubrication value of formation, calculating changes the flow of lubrication value to be formed with bearing inlets lubricating oil pressure,
It is the profit by the flow of lubrication value because of the formation of bearing inlets lubricating oil pressure set in advance and bearing inlets
Lubricating oil relative pressure is multiplied；
According to changing the flow of lubrication value to be formed and set in advance because of axle with bearing inlets lubricating oil pressure
The flow of lubrication value that rotation and extruding are formed is held, total flow of lubrication value of calculation bearing is to set in advance
It is fixed because the flow of lubrication value that bearing rotary and extruding are formed changes shape with bearing inlets lubricating oil pressure
Into flow of lubrication value be added.
4. a kind of simulation analysis device of bearing oil flow, it is characterised in that including：
First controller unit, for the main oil of ambient value and simulation analysis according to bearing set in advance
The lubrication pressure force value in road, the lubricating oil relative pressure of calculation bearing entrance；
Second controller unit, for the lubricating oil relative pressure according to bearing inlets and it is set in advance because
The flow of lubrication value that bearing inlets lubricating oil pressure is formed, calculates and changes shape with bearing inlets lubricating oil pressure
Into flow of lubrication value；
3rd controller unit, the flow of lubrication to be formed is changed for basis with bearing inlets lubricating oil pressure
Value and it is set in advance because bearing rotary and extruding formed flow of lubrication value, total lubricating oil of calculation bearing
Flow value, so that total flow of lubrication characteristic curve of bearing is obtained, to be based on total flow of lubrication
Characteristic curve carries out the simulation analysis of bearing oil flow.
5. device according to claim 4, it is characterised in that also include：
4th controller unit, for according to bearing tachometer value set in advance, by bearing rotating speed and because of axle
The curve of the flow of lubrication characteristic of entrance lubricating oil pressure formation is held, obtains corresponding because of bearing inlets lubrication
The flow of lubrication value that oil pressure is formed；
5th controller unit, for according to bearing tachometer value set in advance, by bearing rotating speed and because of axle
Hold rotation and extruding formed flow of lubrication characteristic curve, obtain it is corresponding because bearing rotary and extruding shape
Into flow of lubrication value.
6. device according to claim 4, it is characterised in that
First controller unit is subtracted with the lubrication pressure force value of simulation analysis main oil gallery set in advance
The ambient value of bearing set in advance is gone, the lubricating oil relative pressure of bearing inlets is obtained；
The second controller unit is because of the lubrication of bearing inlets lubricating oil pressure formation by set in advance
Oily flow value is multiplied with the lubricating oil relative pressure of bearing inlets, obtains becoming with bearing inlets lubricating oil pressure
Change the flow of lubrication value for being formed；
The second controller unit be by it is set in advance because bearing rotary and extruding formed lubricating oil stream
Value with change the flow of lubrication value to be formed with bearing inlets lubricating oil pressure and be added, obtain total profit of bearing
Oil flow value.
7. a kind of simulation analysis system of bearing oil flow, it is characterised in that including：According to right
It is required that the device in 4 to 6 described in any claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510778103.5A CN106709097B (en) | 2015-11-13 | 2015-11-13 | Simulation analysis method, device and system for bearing lubricating oil flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510778103.5A CN106709097B (en) | 2015-11-13 | 2015-11-13 | Simulation analysis method, device and system for bearing lubricating oil flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106709097A true CN106709097A (en) | 2017-05-24 |
| CN106709097B CN106709097B (en) | 2020-02-18 |
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|---|---|---|---|
| CN201510778103.5A Expired - Fee Related CN106709097B (en) | 2015-11-13 | 2015-11-13 | Simulation analysis method, device and system for bearing lubricating oil flow |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696905A (en) * | 2009-10-29 | 2010-04-21 | 苏州轴承厂有限公司 | Lubrication flow test device for thrust bearing |
| US20120148382A1 (en) * | 2010-12-09 | 2012-06-14 | Basf Se | Method and apparatus for the model-based monitoring of a turbomachine |
| CN102788616A (en) * | 2012-07-24 | 2012-11-21 | 华中科技大学 | Flow distribution measuring device and method for lubrication system of combustion engine |
| CN104406031A (en) * | 2014-11-18 | 2015-03-11 | 湖南崇德工业科技有限公司 | Oil returning system of rotating machinery circulation oil lubricating bearing |
-
2015
- 2015-11-13 CN CN201510778103.5A patent/CN106709097B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696905A (en) * | 2009-10-29 | 2010-04-21 | 苏州轴承厂有限公司 | Lubrication flow test device for thrust bearing |
| US20120148382A1 (en) * | 2010-12-09 | 2012-06-14 | Basf Se | Method and apparatus for the model-based monitoring of a turbomachine |
| CN102788616A (en) * | 2012-07-24 | 2012-11-21 | 华中科技大学 | Flow distribution measuring device and method for lubrication system of combustion engine |
| CN104406031A (en) * | 2014-11-18 | 2015-03-11 | 湖南崇德工业科技有限公司 | Oil returning system of rotating machinery circulation oil lubricating bearing |
Non-Patent Citations (1)
| Title |
|---|
| 蔡昕 等: "大气压力对细水雾灭火系统泵组流量特性及效率的影响", 《安全与环境学报》 * |
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| CN106709097B (en) | 2020-02-18 |
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Effective date of registration: 20180412 Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Applicant after: Beijing treasure Car Co.,Ltd. Address before: 102206 Changping District City, Shahe, Sha Yang Road, Beijing Applicant before: BEIQI FOTON MOTOR Co.,Ltd. |
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Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Patentee after: Beijing baowo Automobile Co.,Ltd. Address before: No. 188, Miyun District, Miyun District, Beijing, Beijing Patentee before: Beijing treasure Car Co.,Ltd. |
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