摘要:
Moteur à combustion interne comprenant un piston (1) possédant une cuvette de combustion (3) évidée dans la couronne du piston et une pluralité d'évidements arqués (7) formés dans la paroi latérale (6) de la cuvette et écartés par des parties intermédiaires arquées de la paroi latérale, un organe de turbulence provoquant la rotation de l'air d'admission autour de l'axe de la cuvette, et un organe d'injection de carburant (2) permettant de diriger une pluralité de jets de carburant radialement par rapport à la cuvette et chacun vers un évidement correspondant (7). Le piston se caractérise par le fait que le rapport entre la distance maximum sur laquelle chaque évidement (7) s'étend radialement dans la paroi latérale (6) et le rayon de la paroi latérale (6) se situe entre 0,10 et 0,20.
摘要:
A combustion chamber (3) defined by a recess formed in the piston top (2) in the center axis (O₁) direction thereof with its geometric magnitude being progressively enlarged in the direction of the recess. The intensities of swirl flow (S) and squish flow (V) are optimized by letting the two flows (S,V) interact each other in the upstream side so as to optimize the air flow in the combustion chamber (3) overall. In the meantime, fuel is atomized and injected through a fuel injection nozzle means (15), which has five or more nozzle holes (5), toward the side wall (4a) of the combustion chamber (3) so as to circumferentially divide the chamber (3) by the fuel sprays (f) into five or more approximately equal sections. Thus, uniform dispersion and distribution of fuel together with the optimized flow of air is achieved in the combustion chamber (3), whereby the air utilization rate is raised and the combustion unburnt matters are decreased.
摘要:
A steel piston with an oil gallery, and process for forming a steel piston oil gallery channel, which corresponds to the complex shape of the combustion bowl in the piston crown. The piston crown is made by a cast metal or powder metal forming process. The oil gallery channel is formed to the basic shape that corresponds to the shape of the walls of the combustion bowl. Machine-turning surfaces in the oil gallery channel can be machine- finished as desired. Surfaces in the oil gallery which cannot be machined with conventional turning operations, such as recesses and protrusions into the channel, are left in the original as-formed condition.
摘要:
With regard to a direct injection diesel engine comprising a piston 11, which has an upper recess constituting a cavity 21, and a fuel injection nozzle 12 injecting fuel into the cavity 12 of the piston, nozzle holes 32, which have at least a plurality of intersecting points between an axis of the fuel injection nozzle 12 and opening direction of the nozzle holes 32, are regarded as a pair, and a plurality of the pairs of the nozzle holes are provided in the fuel injection nozzle 12. An opening of a combustion chamber of the piston 11 is a polygon which has five or more corners. Accordingly, with regard to the diesel engine, engine output is improved, and noise and hydrocarbon in discharged gas are reduced.
摘要:
A direct injection diesel engine having a piston (11) with a cavity (21) formed by a recess in the upper surface of the piston and a fuel injection nozzle (12) for injecting fuel into the cavity (21) of the piston. Sets of injection holes are provided in the fuel injection nozzle (12). Each set of the injection holes is composed of injection holes (32), and the direction of the openings of the injection holes (32) of each set intersect at least the axis of the fuel injection nozzle (12) at a plurality of points. The shape of an opening of a combustion chamber of the piston (11) is formed as a polygon having five or more sides. The output of the diesel engine is increased, noise is reduced, and the amount of hydrocarbon in exhaust gases is reduced.
摘要:
A direct injection diesel engine having a piston (11) with a cavity (21) formed by a recess in the upper surface of the piston and a fuel injection nozzle (12) for injecting fuel into the cavity (21) of the piston. Sets of injection holes are provided in the fuel injection nozzle (12). Each set of the injection holes is composed of injection holes (32), and the direction of the openings of the injection holes (32) of each set intersect at least the axis of the fuel injection nozzle (12) at a plurality of points. The shape of an opening of a combustion chamber of the piston (11) is formed as a polygon having five or more sides. The output of the diesel engine is increased, noise is reduced, and the amount of hydrocarbon in exhaust gases is reduced.
摘要:
In an internal combustion engine comprising a piston (1) having a combustion bowl (3) recessed in the crown of the piston and a plurality of arcuate recesses (7) formed in the side wall (6) of the bowl spaced apart by arcuate intermediate portions of the side wall, swirl means to cause the inlet air to rotate about the axis of the bowl, and fuel injection means (2) that serves to direct a plurality of fuel jets radially of the bowl each towards a corresponding recess (7), the piston is characterised in that the ratio of the maximum distance by which each recess (7) extends radially into the side wall (6) compared with the radius of the side wall (6), lies within the range 0.10 to 0.20.
摘要:
A combustion chamber (3) defined by a recess formed in the piston top (2) in the center axis (O₁) direction thereof with its geometric magnitude being progressively enlarged in the direction of the recess. The intensities of swirl flow (S) and squish flow (V) are optimized by letting the two flows (S,V) interact each other in the upstream side so as to optimize the air flow in the combustion chamber (3) overall. In the meantime, fuel is atomized and injected through a fuel injection nozzle means (15), which has five or more nozzle holes (5), toward the side wall (4a) of the combustion chamber (3) so as to circumferentially divide the chamber (3) by the fuel sprays (f) into five or more approximately equal sections. Thus, uniform dispersion and distribution of fuel together with the optimized flow of air is achieved in the combustion chamber (3), whereby the air utilization rate is raised and the combustion unburnt matters are decreased.