CN101699039A - Breakage-resistance valve for engines - Google Patents
Breakage-resistance valve for engines Download PDFInfo
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- CN101699039A CN101699039A CN200910042603A CN200910042603A CN101699039A CN 101699039 A CN101699039 A CN 101699039A CN 200910042603 A CN200910042603 A CN 200910042603A CN 200910042603 A CN200910042603 A CN 200910042603A CN 101699039 A CN101699039 A CN 101699039A
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- valve
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- breakage
- resistance
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Abstract
The invention discloses a breakage-resistance valve for engines, which comprises a valve rod (1) and a head part (2), wherein the valve rod (1) and the head part (2) are connected into a whole through a neck part (3); the outside surface of the neck part (3) is provided with an open helical texture (32); and the helix angle R of the open helical texture (32) is 15 to 55 DEG. The valve is particularly suitable to be used as high-strength anti-fatigue and breakage-resistance valve for large-power diesel engines; and when a high-speed, high-temperature and high-corrosion air flow washes the outside surface of the neck part (3), the resistance of the air flow is reduced because the direction of the air flow is basically consistent with the helical direction of the open helical texture (32) of the neck part (3). Therefore, the invention has the advantages that: the reliability, anti-fatigue performance and breakage resistance of the valve for the engine are improved; and the service life of the valve is improved.
Description
Technical field
The present invention relates to the engine valve of a kind of engine valve, particularly a kind of anti-fracture.
Background technique
Shown in Fig. 1-2, it is the at present big employed valve of multiple-motor, and it comprises valve stem 1 and head 2, and valve stem 1 and head 2 are connected as a single entity by neck 3, the surface of neck 3 is provided with and is concentric ring-shaped closed loop texture 31, and this valve is through the fracture of the circular arc place of the neck 3 of being everlasting.Valve is one of strength member of motor, the operating conditions of valve is very abominable, need bear higher mechanical load and heat load during valve work, bear the stress alternation that impact load and gaseous-pressure gave of taking a seat when comprising valve work repeatedly, the intake valve operating temperature of high reinforcing stimulus generally can reach 300 ℃～600 ℃, the exhaust valve operating temperature generally can reach 600 ℃～850 ℃, even it is higher, also to bear the thermal stress and the gas attack effect of high temperature oxidation stability gas, under harsh so like this operating conditions, therefore make the circular arc place of air valve cervix 3 often be subjected to washing away of high-temperature fuel gas, be easy to produce phenomenon such as corrosion and scaling loss and carbon deposit and cause sharply reduction and rupturing of fatigue strength.Through investigation, in certain valve company 2006～2007 annual user feedback valve quality fault information slip, the rate of fault that ruptures because of the circular arc place of air valve cervix 3 accounts for 55.1% of all-mass fault, so the fracture of the circular arc place of air valve cervix 3 is the main cause of valve quality fault.Further analyze its concrete reason, outside other component beyond having rejected valve, it causes valve in the circular arc place of its neck 3 major cause of failure to be: the air valve cervix surface all is designed to the concentric ring-shaped closed loop texture 31 perpendicular to the valve axis.This in the concentric ring-shaped closed loop texture 31 meeting generations following problem of neck 3 surface design perpendicular to the valve axis: the airflow direction when one, concentric ring-shaped closed loop texture 31 grain directions are with work is inconsistent, increase gas-flow resistance, reduced cylinder charge; When two, working, formed the closed loop circle that stress is concentrated on the valve surface, be subjected to the reciprocal change impacts power of engine valve actuating mechanism and the high corrosion of high-speed and high-temperature air-flow radially under the double action of scouring force at valve, air valve cervix 3 has been formed a shear action, caused fatigue fracture easily at the neck 3 of valve; Three, concentric ring-shaped closed loop texture 31 airflow on surface resistances are big, reduced the axial scouring force of air-flow, thereby easily produce carbon deposit.So becoming the concentric ring-shaped texture 31 perpendicular to the valve axis in air valve cervix 3 surface design at present is to cause its neck 3 place's fatigue strength sharply to reduce and the true cause of fracture when making valve in work, belongs to the irrational intrinsic problem of air valve structure.
Summary of the invention
The engine valve that the objective of the invention is to overcome the above-mentioned deficiency of prior art and a kind of anti-fracture is provided, it can improve the antifatigue of engine valve and the ability of anti-fracture well.
Technological scheme of the present invention is: a kind of engine valve of anti-fracture, and it comprises valve stem and head, and valve stem and head are connected as a single entity by neck, and the outer surface of neck is provided with open helical texture.
The further technological scheme of the present invention is: the spiral angle R of the helical texture of described opening is 15 °～55 °.
The further again technological scheme of the present invention is: the described outer surface roughness that is provided with the neck of open helical texture is Ra0.4 μ m to Ra1.6 μ m.
The further technological scheme of the present invention is: the helical texture of described opening is to carry out helical grinding by the outer surface to neck to form.
The present invention compared with prior art has following characteristics:
The present invention is a kind of high valve of strengthening high output diesel engine antifatigue and anti-fracture that is particularly suitable for.Because its neck is provided with open helical texture outward, corrode air-flow when washing away the outer surface of neck when high-speed and high-temperature is high, airflow direction and neck be provided with outward open helical texture the Hand of spiral basically identical (and present valve when work outside airflow direction and the neck grain direction of concentric ring-shaped closed loop texture be vertical basically, so resistance is very big), therefore air-flow can't pause on the air valve cervix surface, but flow out along with the Hand of spiral of helical texture, improved the fluency that air flue washes away air-flow greatly; Owing to reduced gas-flow resistance, so just increase cylinder charge simultaneously, scanned out carbon deposit easily; And owing to reduced gas-flow resistance, just can not produce stress on the surface of neck and concentrate, can improve the fatigue strength of air valve cervix.Therefore the present invention can improve the ability of reliability, antifatigue and the anti-fracture of engine valve, the working life of improving valve.
In order to be illustrated more clearly in the present invention, enumerate following examples, but its scope to innovation and creation there is not any restriction.
Description of drawings
Fig. 1 is a prior art constructions schematic representation of the present invention;
Fig. 2 is the plan view of Fig. 1;
Fig. 3 is a structural representation of the present invention;
Fig. 4 is the plan view of Fig. 3.
Embodiment
Shown in Fig. 1-2, a kind of engine valve of anti-fracture, it comprises valve stem 1 and head 2, valve stem 1 and head 2 are connected as a single entity by neck 3, the outer surface of neck 3 is provided with open helical texture 32, open helical texture 32 is to carry out helical grinding by the outer surface to neck 3 to form, and the spiral angle R of open helical texture 32 is 15 °～55 °, and the outer surface roughness of neck 3 is Ra0.4 μ m to Ra1.6 μ m.
During work, corrode air-flow when washing away the outer surface of the neck 3 that has open helical texture 32 when high-speed and high-temperature is high, the Hand of spiral basically identical of airflow direction and helical texture 32 (and present valve when work outside airflow direction and the neck 3 grain direction of concentric ring-shaped closed loop texture 31 be vertical basically, so resistance is very big), therefore air-flow can't pause on air valve cervix 3 surfaces, but flow out along with the Hand of spiral of helical texture 32, improved the fluency that air flue washes away air-flow greatly; Owing to reduced gas-flow resistance, so just increase cylinder charge simultaneously, scanned out carbon deposit easily; And owing to reduced gas-flow resistance, just can not produce stress on the surface of neck 3 and concentrate, can improve the fatigue strength of air valve cervix 3.Therefore the present invention has improved the ability of reliability, antifatigue and the anti-fracture of engine valve, the working life of having improved valve from structure.
The present invention is not limited to above-mentioned concrete structure, so long as the engine valve that is provided with open helical texture 32 at the outer surface of neck 3 just drops within protection scope of the present invention.
Claims (5)
1. one kind resists the engine valve that ruptures, and it comprises valve stem (1) and head (2), and valve stem (1) and head (2) are connected as a single entity by neck (3), it is characterized in that: the outer surface of neck (3) is provided with open helical texture (32).
2. the engine valve of anti-fracture according to claim 1, it is characterized in that: the spiral angle R of the helical texture (32) of described opening is 15 °～55 °.
3. the engine valve of anti-fracture according to claim 1 and 2, it is characterized in that: the described outer surface roughness that is provided with the neck (3) of open helical texture (32) is Ra0.4 μ m to Ra1.6 μ m.
4. the engine valve of anti-fracture according to claim 1 and 2, it is characterized in that: the helical texture (32) of described opening is to carry out helical grinding by the outer surface to neck (3) to form.
5. the engine valve of anti-fracture according to claim 3, it is characterized in that: the helical texture (32) of described opening is to carry out helical grinding by the outer surface to neck (3) to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910042603A CN101699039A (en) | 2009-01-23 | 2009-01-23 | Breakage-resistance valve for engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910042603A CN101699039A (en) | 2009-01-23 | 2009-01-23 | Breakage-resistance valve for engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101699039A true CN101699039A (en) | 2010-04-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910042603A Pending CN101699039A (en) | 2009-01-23 | 2009-01-23 | Breakage-resistance valve for engines |
Country Status (1)
| Country | Link |
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| CN (1) | CN101699039A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261273A (en) * | 2010-05-24 | 2011-11-30 | 江苏欧尔特气门有限公司 | R neck spiral polishing air valve |
-
2009
- 2009-01-23 CN CN200910042603A patent/CN101699039A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261273A (en) * | 2010-05-24 | 2011-11-30 | 江苏欧尔特气门有限公司 | R neck spiral polishing air valve |
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Open date: 20100428 |