CN107630729A - A kind of Motor Cam Valve and its lifting curve with cosine constant speed model breeze way determine method - Google Patents
A kind of Motor Cam Valve and its lifting curve with cosine constant speed model breeze way determine method Download PDFInfo
- Publication number
- CN107630729A CN107630729A CN201710768120.XA CN201710768120A CN107630729A CN 107630729 A CN107630729 A CN 107630729A CN 201710768120 A CN201710768120 A CN 201710768120A CN 107630729 A CN107630729 A CN 107630729A
- Authority
- CN
- China
- Prior art keywords
- msub
- mrow
- alpha
- mtd
- breeze way
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
It is an object of the invention to provide a kind of Motor Cam Valve with cosine constant speed model breeze way and its lifting curve to determine method, cosine constant speed model breeze way is formed by two sections, i.e. first paragraph accelerating curve is cosine curve, second segment accelerating curve is curve of equal velocity, and the expression formula of its lifting curve is：As 0≤α≤α1When, hC(α)=C1(1‑cosωα)；Work as α1＜ α≤α0When, hC(α)=E0+E1α, the undetermined constant C of cosine constant speed model breeze way1、E0、E1By boundary condition and α=α1The condition of continuity at place is tried to achieve, i.e. C1=h0/[1+cos(ωGα0)+ωα0(1‑G)sin(ωGα0)], E1=C1·ω·sin(ωGα0), E0=h0/α0E1.It is zero that the present invention, which can keep the order derivative of breeze way end three, and can overcome the discontinuity at breeze way itself segmentation, so as to advantageously reduce valve actuating mechanism shock and vibration and noise as caused by cam profile.
Description
Technical field
The present invention relates to a kind of I. C engine distribution mechanism, specifically valve cam.
Background technology
Valve actuating mechanism is one of internal combustion engine main movement mechanism.Valve actuating mechanism is multiple parts structures by overlapping
Into in diesel engine operation, due to stress and heated change, having different degrees of flexible.To ensure that air valve is in closing
It is tight that moment can keep valve face to be closed with valve seat, and gap must be left in whole valve actuating mechanism driving-chain.Due to valve clearance
Presence, tappet can not be synchronous with the motion of air valve, meanwhile, it is typically normal by section, tappet in order to obtain sufficiently large air valve
With larger acceleration setting in motion.So when tappet, which overcomes gap, removes the air valve that driving remains static, at the beginning of air valve
Speed just changes to quite big numerical value in very short time from zero, and also has identical situation when taking a seat, i.e., is endured when air valve disengages
The speed that post drives and freely taken a seat is very big, easily causes impact strong between valve face and valve seat, abrasion and noise.To understand
Certainly this problem, one section of breeze way is arranged typically outside groundwork section.
Currently used breeze way pattern has longitudinal cosine type breeze way and waits acceleration-constant speed model breeze way.In breeze way lift
In the case of cornerite identical, the speed of longitudinal cosine type breeze way, acceleration and jerk diagram are more smooth, in breeze way end, rise
The second dervative of eikonal number is zero, but thirdly order derivative is not zero, so, Er Qie slightly worse with active section junction stationarity
Movement velocity when air valve is opened is larger；In the higher derivative of breeze way end lifting curve it is zero Deng acceleration-constant speed model, energy
Ensure the stationarity being connected with working end, and there is the unlatching for making air valve constant and take a seat, but wait accelerating sections
Larger impact is had at segmentation with constant speed section.
The content of the invention
It is zero it is an object of the invention to provide the order derivative of breeze way end three can be kept, and breeze way can be overcome
Discontinuity at itself segmentation, so as to advantageously reduce the valve actuating mechanism shock and vibration as caused by cam profile and noise
A kind of Motor Cam Valve and its lifting curve with cosine-constant speed model breeze way determine method.
The object of the present invention is achieved like this：
A kind of Motor Cam Valve with cosine-constant speed model breeze way of the present invention, it is characterized in that：
The breeze way molded line of valve cam includes connected first paragraph accelerating curve and second segment accelerating curve, and first
Section accelerating curve is cosine curve, and second segment accelerating curve is curve of equal velocity, and the expression formula of valve cam lifting curve is：
Corresponding speed, acceleration and jerk diagram expression formula are：
In formula, α1For cosine section cornerite, α0For breeze way cornerite, vCFor speed, aCFor acceleration, jCFor jerk diagram, C1、
E0、E1It is undetermined constant, by boundary condition and α=α1The condition of continuity at place is tried to achieve：
E1=C1·ω·sin(ωGα0)
Wherein, h0For breeze way lift, G is cosine section cornerite coefficient, and size is G=α1/α0；ω represents cosine function
Cycle, size are ω=pi/2 α1。
A kind of Motor Cam Valve lifting curve with cosine-constant speed model breeze way of the present invention determines method, and it is special
Sign is：
(1) breeze way lift h is set0, breeze way wrap angle sigma0With cosine section cornerite coefficient G；
(2) cosine section cornerite is determined according to cosine section cornerite coefficient, i.e.,
α1=G α0；
(3) according to α=α0Locate the boundary condition of breeze way lift, it is determined that
E0+E1α0=h0, E0、E1It is undetermined constant；
(4) according to α=α1Locate the condition of continuity of breeze way lift, it is determined that
C1(1-cosωα1)=E0+E1α1, C1For undetermined constant；
(5) according to α=α1Locate the condition of continuity of breeze way speed, it is determined that
ωC1sin(ωα1)=E1；
(6) it is comprehensive by more than, determine undetermined constant C1、E0、E1, i.e.,
E1=C1·ω·sin(ωGα0)
(7) by undetermined constant C1、E0、E1Substitute intohC(α) is valve cam
The expression formula of lifting curve, obtain the Motor Cam Valve with cosine-constant speed model breeze way.
Advantage of the invention is that：
(1) compared with longitudinal cosine type breeze way, the higher derivative of cam breeze way lifting curve end provided by the invention is
Zero, the stationarity being connected with working end is can guarantee that, so with the advantages of making air valve stably open and take a seat.
(2) compared with waiting acceleration-constant speed model breeze way, segmentation joining place more light inside cam breeze way provided by the invention
It is sliding, so being advantageous to reduce the impact before air valve is opened and after air valve closing between part.
Brief description of the drawings
Fig. 1 is longitudinal cosine type breeze way accelerating curve schematic diagram；
Fig. 2 is contrast of the cosine-constant speed model breeze way with waiting acceleration-constant speed model breeze way lifting curve；
Fig. 3 is contrast of the cosine-constant speed model breeze way with waiting acceleration-constant speed model breeze way rate curve；
Fig. 4 is contrast of the cosine-constant speed model breeze way with waiting acceleration-constant speed model breeze way accelerating curve；
Fig. 5 is contrast of the cosine-constant speed model breeze way with waiting acceleration-constant speed model breeze way jerk diagram.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1-5, cosine of the present invention-constant speed model breeze way lifting curve hC(α) is formed by two sections, and its expression formula is writeable
For：
Corresponding speed, acceleration and jerk diagram expression formula are：
In formula, α1For cosine section cornerite, α0For breeze way cornerite, α1、C1、E0、E1It is undetermined constant,
Big I is by boundary condition and α=α1The condition of continuity at place is tried to achieve.Specifically realize as follows：
Step 1：Given breeze way lift h0, breeze way wrap angle sigma0With cosine section cornerite coefficient G.
Step 2：Cosine section cornerite is determined according to cosine section cornerite coefficient, i.e.,
α1=G α0 (12)
Step 3：According to α=α0Locate the boundary condition of breeze way lift, it is determined that
E0+E1α0=h0 (13)
Step 4：According to α=α1Locate the condition of continuity of breeze way lift, it is determined that
C1(1-cosωα1)=E0+E1α1 (14)
Step 5：According to α=α1Locate the condition of continuity of breeze way speed, it is determined that
ωC1sin(ωα1)=E1 (15)
Step 6：According to formula (12)-(15), undetermined constant C is determined1、E0、E1, i.e.,
E1=C1·ω·sin(ωGα0) (17)
Step 7：By undetermined constant C1、E0、E1Substitute into formula (8) and obtain the cosine-constant speed breeze way lift song for meeting to require
Line.
Claims (2)
1. a kind of Motor Cam Valve with cosine-constant speed model breeze way, it is characterized in that：
The breeze way molded line of valve cam includes connected first paragraph accelerating curve and second segment accelerating curve, first paragraph add
Rate curve is cosine curve, and second segment accelerating curve is curve of equal velocity, and the expression formula of valve cam lifting curve is：
<mrow>
<msub>
<mi>h</mi>
<mi>C</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>&alpha;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mi>&omega;</mi>
<mi>&alpha;</mi>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
<mtd>
<mrow>
<mn>0</mn>
<mo>&le;</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>E</mi>
<mn>0</mn>
</msub>
<mo>+</mo>
<msub>
<mi>E</mi>
<mn>1</mn>
</msub>
<mi>&alpha;</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
<mo><</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Corresponding speed, acceleration and jerk diagram expression formula are：
<mrow>
<msub>
<mi>v</mi>
<mi>C</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>dh</mi>
<mi>C</mi>
</msub>
</mrow>
<mrow>
<mi>d</mi>
<mi>&alpha;</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<mi>&omega;</mi>
<mo>&CenterDot;</mo>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mi>&alpha;</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mn>0</mn>
<mo>&le;</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>E</mi>
<mn>1</mn>
</msub>
</mtd>
<mtd>
<mrow>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
<mo><</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
<mrow>
<msub>
<mi>a</mi>
<mi>C</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>d</mi>
<mn>2</mn>
</msup>
<msub>
<mi>h</mi>
<mi>C</mi>
</msub>
</mrow>
<mrow>
<msup>
<mi>d&alpha;</mi>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>&omega;</mi>
<mn>2</mn>
</msup>
<mo>&CenterDot;</mo>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mi>&alpha;</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mn>0</mn>
<mo>&le;</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mrow>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
<mo><</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
<mrow>
<msub>
<mi>j</mi>
<mi>C</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>d</mi>
<mn>3</mn>
</msup>
<msub>
<mi>h</mi>
<mi>C</mi>
</msub>
</mrow>
<mrow>
<msup>
<mi>d&alpha;</mi>
<mn>3</mn>
</msup>
</mrow>
</mfrac>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>&omega;</mi>
<mn>3</mn>
</msup>
<mo>&CenterDot;</mo>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mi>&alpha;</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mn>0</mn>
<mo>&le;</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mrow>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
<mo><</mo>
<mi>&alpha;</mi>
<mo>&le;</mo>
<msub>
<mi>&alpha;</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
In formula, α1For cosine section cornerite, α0For breeze way cornerite, vCFor speed, aCFor acceleration, jCFor jerk diagram, C1、E0、E1
It is undetermined constant, by boundary condition and α=α1The condition of continuity at place is tried to achieve：
<mrow>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>h</mi>
<mn>0</mn>
</msub>
<mrow>
<mn>1</mn>
<mo>+</mo>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>&omega;G&alpha;</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&omega;&alpha;</mi>
<mn>0</mn>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>G</mi>
<mo>)</mo>
</mrow>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>&omega;G&alpha;</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
</mrow>
E1=C1·ω·sin(ωGα0)
<mrow>
<msub>
<mi>E</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>h</mi>
<mn>0</mn>
</msub>
<mrow>
<msub>
<mi>&alpha;</mi>
<mn>0</mn>
</msub>
<msub>
<mi>E</mi>
<mn>1</mn>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein, h0For breeze way lift, G is cosine section cornerite coefficient, and size is G=α1/α0；ω represents the cycle of cosine function,
Size is ω=pi/2 α1。
2. a kind of Motor Cam Valve lifting curve with cosine-constant speed model breeze way determines method, it is characterized in that：
(1) breeze way lift h is set0, breeze way wrap angle sigma0With cosine section cornerite coefficient G；
(2) cosine section cornerite is determined according to cosine section cornerite coefficient, i.e.,
α1=G α0；
(3) according to α=α0Locate the boundary condition of breeze way lift, it is determined that
E0+E1α0=h0, E0、E1It is undetermined constant；
(4) according to α=α1Locate the condition of continuity of breeze way lift, it is determined that
C1(1-cosωα1)=E0+E1α1, C1For undetermined constant；
(5) according to α=α1Locate the condition of continuity of breeze way speed, it is determined that
ωC1sin(ωα1)=E1；
(6) it is comprehensive by more than, determine undetermined constant C1、E0、E1, i.e.,
<mrow>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>h</mi>
<mn>0</mn>
</msub>
<mrow>
<mn>1</mn>
<mo>+</mo>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>&omega;G&alpha;</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&omega;&alpha;</mi>
<mn>0</mn>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>G</mi>
<mo>)</mo>
</mrow>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>&omega;G&alpha;</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
</mrow>
E1=C1·ω·sin(ωGα0)
<mrow>
<msub>
<mi>E</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>h</mi>
<mn>0</mn>
</msub>
<mrow>
<msub>
<mi>&alpha;</mi>
<mn>0</mn>
</msub>
<msub>
<mi>E</mi>
<mn>1</mn>
</msub>
</mrow>
</mfrac>
</mrow>
(7) by undetermined constant C1、E0、E1Substitute intohC(α) is valve cam lift
The expression formula of curve, obtain the Motor Cam Valve with cosine-constant speed model breeze way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710768120.XA CN107630729B (en) | 2017-08-31 | 2017-08-31 | Internal combustion engine distribution cam with cosine-constant speed type buffer section and lift curve determining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710768120.XA CN107630729B (en) | 2017-08-31 | 2017-08-31 | Internal combustion engine distribution cam with cosine-constant speed type buffer section and lift curve determining method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107630729A true CN107630729A (en) | 2018-01-26 |
| CN107630729B CN107630729B (en) | 2020-11-20 |
Family
ID=61100008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710768120.XA Active CN107630729B (en) | 2017-08-31 | 2017-08-31 | Internal combustion engine distribution cam with cosine-constant speed type buffer section and lift curve determining method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107630729B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109344562A (en) * | 2018-12-18 | 2019-02-15 | 重庆红江机械有限责任公司 | A kind of marine diesel fuel cam lifting curve design method |
| CN110374706A (en) * | 2019-07-22 | 2019-10-25 | 湖州圣龙汽车动力系统有限公司 | Engine symmetrical expression Valve-train Cam |
| CN112761749A (en) * | 2021-02-18 | 2021-05-07 | 哈尔滨工程大学 | Optimization design method for profile of distribution cam of marine diesel engine |
| CN113279833A (en) * | 2021-07-09 | 2021-08-20 | 宁波大学 | Two-order continuous local adjustable symmetrical distribution cam profile combination design method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU663873A1 (en) * | 1977-12-16 | 1979-05-25 | Предприятие П/Я А-1877 | Tappet driving cam |
| CN1693681A (en) * | 2005-04-30 | 2005-11-09 | 重庆大学 | Cam of distributing mechanism of motorcycle engine |
| CN106677852A (en) * | 2016-12-30 | 2017-05-17 | 北京理工大学 | Valve cam profile design method |
-
2017
- 2017-08-31 CN CN201710768120.XA patent/CN107630729B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU663873A1 (en) * | 1977-12-16 | 1979-05-25 | Предприятие П/Я А-1877 | Tappet driving cam |
| CN1693681A (en) * | 2005-04-30 | 2005-11-09 | 重庆大学 | Cam of distributing mechanism of motorcycle engine |
| CN106677852A (en) * | 2016-12-30 | 2017-05-17 | 北京理工大学 | Valve cam profile design method |
Non-Patent Citations (1)
| Title |
|---|
| 强超: "基于配气凸轮驱动的全可变液压气门机构气门运动规律的研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109344562A (en) * | 2018-12-18 | 2019-02-15 | 重庆红江机械有限责任公司 | A kind of marine diesel fuel cam lifting curve design method |
| CN110374706A (en) * | 2019-07-22 | 2019-10-25 | 湖州圣龙汽车动力系统有限公司 | Engine symmetrical expression Valve-train Cam |
| CN110374706B (en) * | 2019-07-22 | 2024-02-20 | 宁波圣龙五湖汽车零部件有限公司 | Symmetrical distribution cam molded line of engine |
| CN112761749A (en) * | 2021-02-18 | 2021-05-07 | 哈尔滨工程大学 | Optimization design method for profile of distribution cam of marine diesel engine |
| CN113279833A (en) * | 2021-07-09 | 2021-08-20 | 宁波大学 | Two-order continuous local adjustable symmetrical distribution cam profile combination design method |
| CN113279833B (en) * | 2021-07-09 | 2024-05-03 | 宁波大学 | Second-order continuous local adjustable symmetrical distribution cam profile combination design method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107630729B (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107630729A (en) | A kind of Motor Cam Valve and its lifting curve with cosine constant speed model breeze way determine method | |
| CN104863715B (en) | A kind of rectangular inlet binary hypersonic change geometry air intake duct, its method for designing and method of work | |
| CN101392685B (en) | Internal waverider hypersonic inlet and design method based on random shock form | |
| CN103790710B (en) | A kind of rocket based combined cycle motor structure changes intake duct | |
| CN206503781U (en) | Adjustable guide vane structure for aero-engine | |
| CN106285946A (en) | The passage of double-axle rotation deformation becomes geometry air intake duct without rider formula in wedge angle | |
| CN108195544A (en) | A kind of impulse type wind-tunnel tandem jet pipe | |
| CN105008668A (en) | Twisted gas turbine engine airfoil having a twisted rib | |
| CN110056400A (en) | Turbine case and its manufacturing method, turbine, the type core for casting turbine case | |
| CN107687353A (en) | A kind of internal combustion engine monoblock type low noise cam profile | |
| CN112298598B (en) | Hypersonic bulge compression profile reverse design method based on curved cone precursor | |
| CN107061116A (en) | A kind of power set and a kind of TRT based on water hammer effect | |
| CN104354881B (en) | Aerospace craft rail control engine control method based on impulse equivalency principle | |
| TWM492368U (en) | Intake manifold with variable diameter | |
| CN101787909A (en) | Optimal design method for valve cam profile | |
| CN108240898A (en) | A kind of impulse type wind-tunnel tandem jet pipe | |
| CN106507869B (en) | Scramjet Inlet wall boundary layer " sawtooth " type artificial transition with | |
| WO2016023315A1 (en) | Supercharger and automobile | |
| CN205103001U (en) | Low speed wind tunnel contraction section panel turnover mechanism | |
| CN201539312U (en) | Passive control type mode conversion valve in variable cycle engine mode conversion mechanism | |
| CN104930245B (en) | Bypass the sealing structure and its method of relief valve | |
| JP6384286B2 (en) | Valve unit | |
| CN207673386U (en) | A kind of supercharger worm-gear case that low-speed performance can be improved | |
| CN205871013U (en) | Rotatory demoulding mechanism of a jacking turns over | |
| CN104963762B (en) | Turbocharging system, power adding method and turbocharging auxiliary device |
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 | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201105 Address after: No.714, 7th floor, shipbuilding electronics world, no.258, Nantong street, Nangang District, Harbin, Heilongjiang Province Applicant after: Harbin Shipbuilding Technology Co., Ltd Address before: 150001 Heilongjiang, Nangang District, Nantong street,, Harbin Engineering University, Department of Intellectual Property Office Applicant before: HARBIN ENGINEERING University |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |