CN207018099U - A kind of convex curved plate air cylinder head structure used for natural gas engine - Google Patents
A kind of convex curved plate air cylinder head structure used for natural gas engine Download PDFInfo
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- CN207018099U CN207018099U CN201720916485.8U CN201720916485U CN207018099U CN 207018099 U CN207018099 U CN 207018099U CN 201720916485 U CN201720916485 U CN 201720916485U CN 207018099 U CN207018099 U CN 207018099U
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- cylinder head
- convex curved
- curved plate
- spark plug
- natural gas
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Abstract
It the utility model is related to a kind of convex curved plate air cylinder head structure used for natural gas engine, it is characterised in that：The bottom plate of cylinder head is convex curved plate, convex curved plate is integrally in the dome shape to raise up, the thickness of convex curved plate is 8mm ~ 12mm, the bottom plate arc radius of convex curved plate is 200mm ~ 500mm, there is a circle transition arc in convex curved plate spark plug mounting hole position, the radius of transition arc is 10mm ~ 50mm, there is the spark plug sleeve upwardly extended at the spark plug mounting hole of convex bottom plate inner face, the wall thickness of spark plug sleeve is 3mm ~ 5.5mm sparks plug sleeve and cylinder head integrally casting.It is applied to state VI and above Abgasgesetz, can be obviously improved cylinder head low-cycle fatigue life and then improve cylinder head reliability.
Description
Technical field
A kind of convex curved plate air cylinder head structure used for natural gas engine is the utility model is related to, it is natural to belong to commercial car
Gas technical field of engines.
Background technology
With the development of natural gas technology, natural gas engine will face the implementation of state's VI Abgasgesetzs.It is international at present
On more ripe technology path be to take equivalent burning, outside cooling EGR and three-way catalytic converter technology.The technology path
Using while laws and regulations requirement is met, delivery temperature raises more than 80 DEG C than state V, causes the adverse effects such as thermic load rise,
More harsh requirement is proposed to cylinder head thermal fatigue property.
The natural gas engine difference maximum from diesel engine is that its ignition way is different, and diesel engine uses compression ignition side
Formula is, it is necessary to which certain base plate thickness and bulk strength resist more than 200bar explosion pressure, and natural gas engine uses
With gasoline engine identical ignition way, explosion pressure is relatively low, but thermic load increase, and it is more equal to obtain can to design thinner bottom plate
Even temperature field and more preferable low-cycle fatigue life.In addition, improvement is designed on the basis of original fuel injector sleeve to adapt to
The installation requirement of spark plug, spark plug must reliably seal ne-leakage.Under these conditions, it is necessary to which the structure for optimizing cylinder head is set
Meter, it is ensured that the Performance And Reliability of engine.
The A of Patent No. CN 103573459 Chinese patent literature 1《A kind of cylinder cover of natural gas engine》Disclose one
Kind cylinder cover of natural gas engine, it is the frame-type cavity body structure being made up of bottom plate, side plate and top plate, including：Inlet and outlet
Road, its in the middle part of the cavity and by valve respectively with combustion chamber；Valve retainer hole, it is located at inlet and outlet road respectively
Between combustion chamber, for installing valve retainer and forming the band for head portion that；Tray formula combustion chamber；Spark plug is pacified
Hole is filled, it is located between inlet and outlet road position and connected with tray formula combustion chamber.
Patent No. CN203248265U Chinese patent literatures 2《A kind of fork truck cylinder head used for natural gas engine》Disclose
A kind of fork truck cylinder head used for natural gas engine, it is installed on the 495BPG series forklift engines of burning natural gas, including length
Square cylinder head body, offers cooling water channel in cylinder head body, is provided through the cylindrical, copper in cooling water channel
Sleeve pipe, the axis of copper sleeve and cylinder head lower plane are into slanted angle；Copper sleeve bottom inner bottom surface center offers through hole, described
Through hole runs through the cylinder head body, and installs spark plug.
Patent No. CN201358841 patent documents 3《Cylinder cover structure of natural gas engine》Disclose a kind of natural gas
Engine air cylinder head structure, construction include the cylinder head of engine, combustion chamber are provided with cylinder head, combustion chamber is provided with spark
Consent.For existing 4JB1 diesel engines, cylinder head is transformed, adds combustion chamber, fire is set on combustion chamber
Flower consent, using spark ignition type structure, cancel nozzle opening, to be adapted to burning natural gas.
Simple for air cylinder head structure form disclosed in patent document 1, patent document 2 and patent document 3, only explanation is applicable
In natural gas engine, integrity problem is not considered more fully；The spark plug installation that cylinder head described in patent document 2 uses
It is copper sheathing form, it is poor that spark plug copper sheathing by space is limited rigidity, and stress relaxation phenomenon easily occurs when engine works, leads
Cause the failures such as leak.
To sum up, existing natural gas air cylinder head structure design is simpler, can not meet harsh state's VI Abgasgesetzs, and use
Equivalent burning plus EGR add the gentle thermic load of higher row that TWC technology paths are brought, and thermal fatigue cracking failure easily occurs.Therefore, it is
Solve the above problems, it is necessary to invent a kind of high reliability cylinder head suitable for state VI Abgasgesetz technology paths.
The content of the invention
The purpose of this utility model is to provide a kind of convex curved plate air cylinder head structure used for natural gas engine, and it is applicable
In state VI and above Abgasgesetz, cylinder head low-cycle fatigue life can be obviously improved and then improve cylinder head reliability.
What the technical solution of the utility model was realized in：A kind of convex curved plate cylinder head used for natural gas engine
Structure, it is characterised in that：The bottom plate of cylinder head is convex curved plate, and convex curved plate is integrally dome-shaped in raising up
Shape, the thickness of convex curved plate is 8mm ~ 12mm, and the bottom plate arc radius of convex curved plate is 200mm ~ 500mm, upper
There is a circle transition arc convex bottom plate spark plug mounting hole position, and the radius of transition arc is 10mm ~ 50mm, convex bottom plate
Have the spark plug sleeve upwardly extended at the spark plug mounting hole of inner face, the wall thickness of spark plug sleeve for 3mm ~ 5.5mm sparks plug sleeve with
Cylinder head integrally casting.
Good effect of the present utility model is that it is applied to state's VI Abgasgesetzs；Prevent spark plug sleeve water leakage fault；It is convex
Curved plate realizes that precision is high, and shape is similar to combustion chamber of petrol engine, beneficial to the burning of natural gas using machining mode；It is logical
Crossing reduction curved plate thickness makes coolant take away more heats, reduces the temperature of whole bottom plate and obtains lower fire power face temperature
Field is spent, ensure that reliability of the cylinder head under high heat load condition of work；Because of the particularity of this planform, make influence cylinder
The tension and compression stress of lid low-cycle fatigue life is released, and so as to significantly improve cylinder cap low-cycle fatigue life, makes the gas of six-in-line four
The low-cycle fatigue life of valve engine can be than same type machine state V natural gas machines lifting 50% or so.The casting of cylinder head is taken into account simultaneously
Manufacturability, percent defective is reduced, reduce weight, so as to cost-effective.
Brief description of the drawings
Fig. 1 is convex curved plate air cylinder head structure sectional view described in the utility model.
Fig. 2 is convex curved plate cylinder head schematic top view described in the utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：As shown in Figure 1, 2, it is a kind of it is used for natural gas engine on
Convex bottom plate air cylinder head structure, it is characterised in that：The bottom plate of cylinder head is convex curved plate 1, and convex curved plate 1 is overall
In the dome shape to raise up, the thickness of convex curved plate 1 is 8mm ~ 12mm, and the bottom plate circular arc of convex curved plate 1 is partly
Footpath 2 is 200mm ~ 500mm, there is a circle transition arc 3 in the convex spark plug mounting hole position of curved plate 1, the half of transition arc 3
Footpath is 10mm ~ 50mm, there is the spark plug sleeve 4 upwardly extended, spark plug sleeve 4 at the spark plug mounting hole of the inner face of convex bottom plate 1
Wall thickness be 3mm ~ 5.5mm sparks plug sleeve 4 and cylinder head integrally casting.
The convex shape of curved plate 1 by bottom plate arc radius 2 and machining bottom plate and, transition arc 3 is formed；Machine
A part for the dome-shaped convex structure composition combustion chamber of curved plate 1 of tool processing, natural gas burn wherein.
Claims (1)
- A kind of 1. convex curved plate air cylinder head structure used for natural gas engine, it is characterised in that：The bottom plate of cylinder head is convex Curved plate, for convex curved plate integrally in the dome shape to raise up, the thickness of convex curved plate is 8mm ~ 12mm, on The bottom plate arc radius of convex bottom plate is 200mm ~ 500mm, is enclosed in convex curved plate spark plug mounting hole position Circular arc is crossed, the radius of transition arc is 10mm ~ 50mm, has the fire upwardly extended at the spark plug mounting hole of convex bottom plate inner face Flower plug sleeve, the wall thickness of spark plug sleeve is 3mm ~ 5.5mm sparks plug sleeve and cylinder head integrally casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720916485.8U CN207018099U (en) | 2017-07-26 | 2017-07-26 | A kind of convex curved plate air cylinder head structure used for natural gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720916485.8U CN207018099U (en) | 2017-07-26 | 2017-07-26 | A kind of convex curved plate air cylinder head structure used for natural gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207018099U true CN207018099U (en) | 2018-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720916485.8U Active CN207018099U (en) | 2017-07-26 | 2017-07-26 | A kind of convex curved plate air cylinder head structure used for natural gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207018099U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519297A (en) * | 2019-01-03 | 2019-03-26 | 广西玉柴机器股份有限公司 | A kind of novel natural gas engine cylinder cap |
-
2017
- 2017-07-26 CN CN201720916485.8U patent/CN207018099U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519297A (en) * | 2019-01-03 | 2019-03-26 | 广西玉柴机器股份有限公司 | A kind of novel natural gas engine cylinder cap |
| WO2020140484A1 (en) * | 2019-01-03 | 2020-07-09 | 广西玉柴机器股份有限公司 | Novel cylinder head of natural gas engine |
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