CN103670664B - Dark pit direct spray petrol engine in cylinder piston head firing chamber - Google Patents
Dark pit direct spray petrol engine in cylinder piston head firing chamber Download PDFInfo
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- CN103670664B CN103670664B CN201310654168.XA CN201310654168A CN103670664B CN 103670664 B CN103670664 B CN 103670664B CN 201310654168 A CN201310654168 A CN 201310654168A CN 103670664 B CN103670664 B CN 103670664B
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- firing chamber
- dark pit
- piston head
- dark
- guiding gutter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The present invention relates to a kind of dark pit direct spray petrol engine in cylinder piston head firing chamber, this firing chamber is made up of guiding gutter, dark pit firing chamber and boss three part; Described guiding gutter is positioned at piston head oil sprayer direction, and by the downward-sloping top extending to dark pit firing chamber in piston head edge; Boss is positioned at the position relative with guiding gutter, dark pit top of combustion chamber edge.The present invention can reduce airspeed in dark pit, and in minimizing firing chamber, large scale air-flow is on the impact of airspeed in dark pit, and can keep the amount of fuel in dark pit; Make can be formed near spark plug the mixed gas that speed and air fuel ratio are suitable for lighting, increase the ignition window under same injection timing, achieve stable ignition and rapid combustion, and then improve the dark pit direct spray petrol engine in cylinder piston head firing chamber of fuel economy of combustion stability and motor.
Description
Technical field
The invention belongs to combustion system of engine technical field, particularly a kind of direct spray petrol engine in cylinder piston head firing chamber.
Background technique
Along with the continuous progress of gasoline in-cylinder direct fuel-injection engine technology, gasoline in-cylinder direct injection combustion system also obtain fast development.Piston head firing chamber is the important component part of gasoline in-cylinder direct injection combustion system, has very large impact to engine performance and burning.Different combustion systems is based on different mixed gas organizational forms, and piston head shape also has very big difference.Volkswagen TSI combustion system of engine adopts shallow pot shape firing chamber to match with side oil sprayer; Toyota Motor Corporation adopts shell-like firing chamber to coordinate with gap nozzle; Mazda Sky-G motor adopts dark pit firing chamber to match with side multiple orifice nozzle.
In shallow firing chamber (shallow pot shape, shell-like firing chamber) pit, mixed gas reserve capability is more weak, can not form stable stratified mixtures; Simple dark pit firing chamber, though have mixed gas hold facility, because aditus laryngis is less, to make fuel oil spray in pit, strictly must control injection timing.
In cylinder, form stratified mixtures, denseer near spark plug, other positions are rarer, all beneficial to igniting, burning and discharge.Current combustion system or mixed gas hold facility poor, or to fuel oil spray timing events very strict.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of when can realize there is large scale air-flow in cylinder, near spark plug, formation speed and air fuel ratio are suitable for the mixed gas lighted, increase the ignition window under same injection timing, realize stable ignition and rapid combustion, and then the dark pit direct spray petrol engine in cylinder piston head firing chamber of the fuel economy of raising combustion stability and motor.
In order to solve the problems of the technologies described above, dark pit direct spray petrol engine in cylinder piston head firing chamber of the present invention is made up of guiding gutter, dark pit firing chamber and boss three part; Described guiding gutter is positioned at piston head oil sprayer direction, and by the downward-sloping top extending to dark pit firing chamber in piston head edge; Boss is positioned at the position relative with guiding gutter, dark pit top of combustion chamber edge.
The present invention adopts dark pit firing chamber, can reduce airspeed in dark pit, and in minimizing firing chamber, large scale air-flow is on the impact of airspeed in dark pit, and can keep the amount of fuel in dark pit, piston head arranges guiding gutter and boss, the fuel oil of oil sprayer ejection sprays along guiding gutter to dark pit firing chamber, part fuel oil blocks change direction through boss and flows into dark pit firing chamber, further increase the amount of fuel spraying into dark pit, reduce large scale air-flow in cylinder to affect dark pit air-flow and mixed gas, make can be formed near spark plug the mixed gas that speed and air fuel ratio are suitable for lighting, increase the ignition window under same injection timing, achieve stable ignition and rapid combustion, and then improve the dark pit direct spray petrol engine in cylinder piston head firing chamber of fuel economy of combustion stability and motor.
The degree of depth of described dark pit firing chamber is more than or equal to aditus laryngis radius, is less than or equal to throat diameter.
The width of described boss is more than or equal to throat diameter, is less than or equal to 1.2 times of throat diameters.Can ensure that the fuel oil sprayed into by guiding gutter all can flow into dark pit firing chamber.
To spray in the amount of fuel of dark pit firing chamber and cylinder large scale air-flow on dark pit firing chamber air-flow and the impact of mixed gas and the size of boss height directly related, the suitable height of boss is 2 ~ 5mm.
Different according to piston diameter, other parameters of combustion system are different, and the guiding gutter gradient, subtended angle, boss height etc. are not identical yet.
The gradient angle of described guiding gutter is preferably 5 ~ 8 degree, and the fuel oil that can ensure to spray to guiding gutter all enters dark pit firing chamber, and piston surface area increases little.
The subtended angle of described guiding gutter is preferably 30 ~ 35 degree, and the fuel oil that can ensure to spray to guiding gutter all enters dark pit firing chamber.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the longitudinal profile schematic diagram of dark pit direct spray petrol engine in cylinder piston head firing chamber of the present invention.
Fig. 2 is the plan view of dark pit direct spray petrol engine in cylinder piston head firing chamber of the present invention.
1: guiding gutter; 2: dark pit firing chamber; 3: boss; 4, boss height; 5, dark pit combustion-chamber depth; 6, dark pit firing chamber waist diameter; 7: guiding gutter gradient angle; 8: throat diameter; 9: guiding gutter angle; 10: piston diameter;
Embodiment
As shown in Figure 1, dark pit direct spray petrol engine in cylinder piston head firing chamber of the present invention is made up of guiding gutter 1, dark pit firing chamber 2 and boss 3 three part; Described guiding gutter 1 is positioned at piston head oil sprayer direction, and by the downward-sloping top extending to dark pit firing chamber 2 in piston head edge; Boss 3 is positioned at the dark pit firing chamber 2 top position relative with guiding gutter 1.
Embodiment 1
Little cylinder diameter piston head design proposal.Be the piston head of 60-70mm for piston diameter, the height 4 of boss 3 is 2.5-3.5mm, and the width 10 of boss 3 is 18-25.2mm; The throat diameter 8 of dark pit firing chamber 2 is 18-21mm, and waist diameter 6 is 18-22mm, and the degree of depth 5 of dark pit firing chamber 2 is 9-21mm, and gradient angle 7 is 5-8 degree, and the angle 9 of guiding gutter 1 is 30-35 degree.
Adopting the little cylinder diameter piston engine of the present embodiment, by optimizing quality of mixing gas mixture in cylinder, improving fuel economy, especially improve the fuel economy of high rotating speed middle and high load working condition in commonly using.
Embodiment 2
Medium cylinder diameter piston head design proposal.Be the piston head of 70-80mm for piston diameter, the height 4 of boss 3 is 3.5-4.5mm, and the width 10 of boss 3 is 19-26.4mm; The throat diameter 8 of dark pit firing chamber 2 is 19-22mm, and waist diameter 6 is 19-24mm, and the degree of depth 5 of dark pit firing chamber 2 is 9.5-22mm, and gradient angle 7 is 5-8 degree, and the angle 9 of guiding gutter 1 is 30-35 degree.
Adopt the medium cylinder diameter piston engine of the present embodiment, by optimizing quality of mixing gas mixture in cylinder, improving combustion stability, accelerating warming-up process, reduce discharge.
Embodiment 3
Comparatively large-diameter piston head design proposal.Be the piston head of 80-90mm for piston diameter, the height 4 of boss 3 is 4-5mm, and the width 10 of boss 3 is 21-30mm; The throat diameter 8 of dark pit firing chamber 2 is 21-25mm, and waist diameter 6 is 21-27mm, and the degree of depth 5 of dark pit firing chamber 2 is 10.5-25mm, and gradient angle 7 is 5-8 degree, and the angle 9 of guiding gutter 1 is 30-35 degree.
Adopting the comparatively large-diameter piston engine of the present embodiment, by optimizing quality of mixing gas mixture in cylinder, improving fuel economy; At idling operation, improve quality of mixing gas mixture, reduce idling operation circulating fuel injection quantity, improve fuel economy further; Accelerate warming-up process, reduce discharge.
Claims (6)
1. a dark pit direct spray petrol engine in cylinder piston head firing chamber, is characterized in that being made up of guiding gutter (1), dark pit firing chamber (2) and boss (3) three part; Described guiding gutter (1) is positioned at piston head oil sprayer direction, and by the downward-sloping top extending to dark pit firing chamber (2) in piston head edge; Boss (3) is positioned at dark pit firing chamber (2) the top position relative with guiding gutter (1).
2. dark pit direct spray petrol engine in cylinder piston head firing chamber according to claim 1, is characterized in that the degree of depth of described dark pit firing chamber (2) is more than or equal to aditus laryngis radius, is less than or equal to throat diameter.
3. dark pit direct spray petrol engine in cylinder piston head firing chamber according to claim 1, is characterized in that the width of described boss (3) is more than or equal to throat diameter, is less than or equal to 1.2 times of throat diameters.
4. dark pit direct spray petrol engine in cylinder piston head firing chamber according to claim 1, is characterized in that the height of described boss (3) is 2 ~ 5mm.
5. dark pit direct spray petrol engine in cylinder piston head firing chamber according to claim 1, is characterized in that the gradient angle of described guiding gutter (1) is 5 ~ 8 degree.
6. dark pit direct spray petrol engine in cylinder piston head firing chamber according to claim 1, is characterized in that the subtended angle of described guiding gutter (1) is 30 ~ 35 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310654168.XA CN103670664B (en) | 2013-12-05 | 2013-12-05 | Dark pit direct spray petrol engine in cylinder piston head firing chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310654168.XA CN103670664B (en) | 2013-12-05 | 2013-12-05 | Dark pit direct spray petrol engine in cylinder piston head firing chamber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103670664A CN103670664A (en) | 2014-03-26 |
| CN103670664B true CN103670664B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310654168.XA Active CN103670664B (en) | 2013-12-05 | 2013-12-05 | Dark pit direct spray petrol engine in cylinder piston head firing chamber |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106321276A (en) * | 2016-08-31 | 2017-01-11 | 中国第汽车股份有限公司 | Piston used for 1L direct injection gasoline engine spherical combustion chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05240052A (en) * | 1992-02-27 | 1993-09-17 | Toyota Motor Corp | Cylinder injection type internal combustion engine |
| JPH08200073A (en) * | 1995-01-30 | 1996-08-06 | Aisin Seiki Co Ltd | Indirect injection diesel engine |
| JP2002285846A (en) * | 2001-03-27 | 2002-10-03 | Nissan Diesel Motor Co Ltd | Indirect diesel engine |
| CN203050906U (en) * | 2013-01-06 | 2013-07-10 | 重庆长安汽车股份有限公司 | Cylinder inside direct-injection gasoline-engine piston |
| CN203669993U (en) * | 2013-12-05 | 2014-06-25 | 中国第一汽车股份有限公司 | Deep pit combustor on top of piston of gasoline direct injection engine |
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| CN103670664A (en) | 2014-03-26 |
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