285results about "Pistons" patented technology

The invention provides a piston crown, a piston and a diesel engine, the piston crown comprises a piston outer surface layer, a piston inner surface layer and a filling layer, the piston outer surface layer and the piston inner surface layer define a containing space, and the containing space is filled with the filling layer; the filling layer comprises a plurality of crystal lattice structures, at least one liquid inlet and at least one liquid outlet which are communicated with the containing space are formed in the inner surface layer of the piston, and first cooling flow channels are formed among the liquid inlets, gaps among the crystal lattice structures in the filling layer and the liquid outlets; the first cooling flow channel is configured in the mode that cooling lubricating oil can flow into the containing space through the liquid inlet and flow to the liquid outlet through gaps between the lattice structures to flow out.

To provide an internal combustion engine that easily promotes mixing of spray and air.SOLUTION: An internal combustion engine comprises: a cylinder head; and a cavity formed in a top surface of a piston, and forming a combustion chamber between itself and the cylinder head. The cavity comprises: a first surface arranged in a top surface center part of the piston; a second surface arranged around the first surface, and arranged closer to the side of the cylinder head than the first surface; a groove part provided in the second surface, and recessed toward the side of the first surface; and a wall provided in the groove part on the side of the first surface, and separating a first space formed on the first surface, and a second space formed in the groove part. The wall includes a first slit connecting the first space and the second space.SELECTED DRAWING: Figure 3

A piston (22) for an internal combustion engine (12) includes a piston skirt (64) and a piston crown (70) attached to the piston skirt and including a combustion face (72). The combustion face forms a piston rim (74) and a combustion bowl (78). A bowl rim (82) defines an intersection of the combustion bowl and the piston rim, and a reentry surface (84) defining a reentry angle extends between the bowl rim and the bowl outer wall. A ratio of a bowl depth dimension coincident with the piston central axis to a compressed height dimension coincident with the piston central axis is from about 0.30 to about 0.35.

The internal combustion engine piston capable of reducing abrasion comprises a piston body and a piston head, the piston body and the piston head are fixed, a piston ring groove is formed in the outer wall of the circumference of the piston head, a sealing ring is fixedly connected in the piston ring groove, a plurality of reinforcing rings are fixed in the piston head, the piston body comprises a high-temperature-resistant filling layer, and the high-temperature-resistant filling layer is arranged in the piston ring groove. A high-temperature-resistant filling layer is fixedly connected to the outer side of the plug body, a wear-resistant layer is fixedly connected to the outer side of the high-temperature-resistant filling layer, the high-temperature-resistant filling layer is made of aluminum alloy or nickel alloy, the wear-resistant layer is a dlc coating or a high-silicon aluminum alloy coating, and an assembly hole is formed in the bottom of the plug body. According to the wear-resistant piston, the high-temperature-resistant filling layer and the wear-resistant layer are matched for use, so that the piston body is more wear-resistant and high-temperature-resistant, the service life of the piston is prolonged, meanwhile, the piston and an external device can be connected more tightly through the sealing ring, and the piston head can be firmer and more durable through the reinforcing ring.

The invention relates to a combustion system, an engine and a vehicle. The combustion system comprises an air inlet channel, an exhaust channel, an air inlet valve, an exhaust valve, a cylinder cover, a cylinder sleeve and a piston, a cylinder cover combustion chamber is arranged in the combustion system, and at least one of the inner surface of the cylinder cover combustion chamber, the surface, facing the interior of the combustion system, of the air inlet valve, the surface, facing the interior of the combustion system, of the exhaust valve and the top surface of the piston is provided with a thermal barrier coating.

The utility model discloses a steel piston which is characterized in that an inclined oil hole platform is arranged at the bottom of an inner cavity of an inner cavity surface of a steel piston main body and protrudes out of the surface of the inner cavity surface, and an inclined oil hole communicated with a lubricating oil channel is formed in the inclined oil hole platform; cooling lubricating oil stored in the cooling oil cavity enters the contact faces of the connecting rod, the piston pin and the piston pin hole sequentially through the lubricating oil channel, the inclined oil hole and the oil hole in the connecting rod small end, the protruding inclined oil hole platform structure is easier to forge and form compared with a small pit structure, the blank manufacturing difficulty is lowered, and the machining efficiency is improved. The protruding inclined oil hole platform structure can better guide cooling lubricating oil in the cooling oil cavity to flow into the connecting rod and the piston pin, lubrication is provided for contact between the piston pin hole and the connecting rod and the piston pin, and the occlusion risk is effectively reduced. The lightweight design and the machining quality are both considered, and meanwhile the failure risk of the piston in an engine is reduced.

The dual-fuel engine piston capable of reducing methane emission comprises a piston body, a concave pit is formed in the top face of the piston body to serve as a combustion chamber, the top face of the piston body is connected with the side face of the piston body through a flow guide face, and the combustion chamber is communicated with the flow guide face through a plurality of vortex grooves. A set included angle is formed between the vortex groove and the tangent line of the outer circumference of the combustion chamber; according to the utility model, the flow guide surface is arranged between the piston top surface and the piston side surface, so that natural gas in the backlash can be guided into the combustion chamber for combustion, and methane emission is further reduced. A vortex groove is formed in the top face of the piston, natural gas in a side gap passes through a flow guide face to a motion chamber in a combustion chamber and inevitably passes through the vortex groove, airflow is guided by the vortex groove to form a certain vortex in a cylinder, later-stage combustion is accelerated, combustion is more sufficient, and methane emission is further reduced.

A piston for an internal combustion engine includes a piston crown having a crown outer surface that forms piston lands axially alternating with piston ring grooves that together with the piston lands define a deposit sensitive region. The crown outer surface is smoothed to an average roughness (Ra) of 0.0002 millimeters or less and refined to a mirror finish Ra of 0.000125 to inhibit deposit formation and / or adhesion within at least a portion of the deposit sensitive region.

An exhaust valve includes a valve head and a valve stem extending from the valve head. The valve head includes a combustion face and a seat face. The combustion face and the seat face are on opposing sides of the valve head. The seat face is configured to matingly engage an opposing surface. The valve head is formed of a base material. A valve thermal management composition coats at least a portion of the seat face and comprises increased thermal conductivity relative to the base material of the valve head.

The utility model relates to the field of pistons, in particular to a composite surface treatment piston. The composite surface treatment piston comprises a head part, wherein the head part is covered with a hard anodic oxidation layer; the main body is covered with a black phosphate coating; and the skirt part is covered with a graphite layer. The composite surface treatment piston is provided with various coatings, so that the performance of each part of the piston can be enhanced as required, and the durability of the piston is improved.

The invention discloses a combined piston and a preparation method thereof, the combined piston comprises a piston head and a piston skirt, the piston head is provided with a connecting piece, the piston skirt is provided with a through groove convenient for the connecting piece to penetrate through, and the piston skirt is also provided with a limiting groove matched with the connecting piece. The combined piston is safe and reliable in connection and can continuously work for a long time. The parts of the combined piston are reduced, the efficiency is high, bolts, nuts, gaskets and other parts are not needed for combined assembly, the part structure of the combined piston is greatly simplified, the machining procedure is simplified, the cost is remarkably saved, and the installation efficiency is improved.

This invention discloses a piston and its design method, relating to the field of piston technology. The piston includes a skirt and a head connected to the top of the skirt. The skirt has a pin hole extending transversely through the skirt. Two hole sides are located on either side of the skirt along the transverse direction. A main thrust side and a secondary thrust side are formed on either side of the skirt along the longitudinal direction. The main thrust side has two first grooves recessed towards the secondary thrust side, both located near the bottom of the skirt and spaced apart transversely. The secondary thrust side has a second groove recessed towards the main thrust side, located near the top of the skirt. The piston provided by this invention can effectively avoid stress concentration, reduce abnormal wear, has a long service life, and high reliability.

A piston and injector system designed to minimize thermal loading on the cylinder head of an internal combustion engine. The piston features a profiled upper surface that defines an annular piston bowl with a primary bowl configuration and an asymmetric bowl sector. The asymmetric bowl sector is configured to receive the fuel spray from the injector, directing combustion to reduce heat concentration on certain areas of the cylinder head. This design helps prevent overheating, thereby enhancing engine durability and performance.

This invention relates to the field of engine technology and discloses a combustion chamber suitable for opposed piston engines, comprising a cylinder block, an intake piston, an exhaust piston, a fuel injector, and a spark plug. The intake and exhaust pistons are respectively disposed at both ends of the cylinder block and together with the inner wall of the cylinder block to form the combustion chamber. The fuel injector sprays fuel jets towards the intake and exhaust pistons, respectively, and the fuel jets sprayed towards the intake and exhaust pistons are asymmetrically distributed with reference to the central cross-section of the cylinder block. A first guide groove is formed on the end face of the intake piston facing the combustion chamber, and a first fragmentation part is arranged around the inner side of the first guide groove. Multiple second guide grooves are formed on the end face of the exhaust piston facing the combustion chamber, and a second fragmentation part is arranged in each second guide groove. This invention not only promotes the rapid fragmentation of the fuel jet and guides it to the center of the combustion chamber, but also promotes the diffusion and mixing of fuel and air, achieving rapid and stable combustion.

This internal combustion engine includes, in a cavity (CA), a bottom wall (510) that extends radially outward from a center axis (A) while gradually trending away from a cylinder head, a plurality of recess walls (520) that are in communication with the bottom wall (510) and are curved so as to protrude radially outward, and step sections (550) that are provided between the bottom wall (510) and the recess walls (520), wherein the step sections (550) are arc-shaped in planar view. As a result, a spray flame (B2) that flows along the bottom wall (510) flows along the step sections (550), and thus the spray flame (B2) is drawn away (the areas surrounded by dashed lines (VII) in the diagram) from the bottom wall (510) and moves toward the center of the cavity (CA), and mixing of a fuel and residual air is further promoted, making it possible to improve combustion efficiency.

The invention discloses a manufacturing method of a heteromorphic aluminum piston. The manufacturing method comprises the following operation steps: S1, casting a piston head made of an aluminum alloy material, and synchronously embedding a wear-resistant insert ring and a salt core; s2, forging a piston skirt part made of an aluminum alloy material; s3, the piston head and the piston skirt are welded into a whole through the friction welding technology; and S4, welding flashes are removed, final finish machining is conducted on the combined piston blank, anodic oxidation or other surface treatment is conducted, and the finished composite integrated piston is obtained. The invention further provides the aluminum piston prepared through the manufacturing method of the abnormal-state aluminum piston. According to the manufacturing method of the special-state aluminum piston, metallurgical bonding of the casting head and the forging skirt is achieved through the friction welding solid connection technology, the problems of fusion welding cracks and air hole defects are fundamentally avoided, meanwhile, the requirements for abrasion resistance and heat resistance of the head and toughness of the skirt are considered, lightweight design is conducted, the manufacturing period is shortened, and the percent of pass is increased.

A piston 3 comprises a piston head 5, a piston sleeve 6, and an oil flow path 23. The piston sleeve 6 is provided on an underside opposite the piston head 6, and a pin hole 22 is formed along an extension direction that intersects an upward and downward direction in the piston sleeve 6. The oil flow path 23 extends through the piston head 5 and the piston sleeve 6 and has an opening section 31 that is open towards the underside of the piston sleeve 6. A dimension of the opening section 31 along the extension direction of the pin hole 22 is larger than a dimension of the opening section 31 along a width direction that intersects both the upward and downward direction and the extension direction of the pin hole 22.

A coating system including a coating configured to be applied to a combustion surface of a piston and to initiate combustion of a gaseous fuel-air mixture; a first coating zone including the coating, the first coating zone being configured to correspond to a first combustion position on the combustion surface of the piston; and a second coating zone including the coating, the second coating zone being configured to correspond to a second combustion position on the combustion surface of the piston.

The invention discloses a welded all-steel piston and a manufacturing method thereof.The manufacturing method of the welded all-steel piston comprises the following operation steps that S1, a piston head and a piston skirt are preprocessed; s2, friction welding is conducted, specifically, the preprocessed piston head and the piston skirt are connected into a whole in a friction welding mode, and a closed inner cooling oil cavity is formed in the piston head and the piston skirt; s3, vacuum tempering is conducted; s4, the inner cooling oil cavity is filled with a removable sealing medium, specifically, the inner cooling oil cavity is filled with a removable solid sealing medium, and the whole inner cooling oil cavity and the oil hole are filled and sealed with the solid sealing medium; s5, finish machining is conducted, specifically, the piston body filled with the solid sealing medium is subjected to finish machining; and S6, the sealing medium is removed, specifically, the piston body subjected to finish machining is heated, so that the solid sealing medium is melted or softened, and the solid sealing medium is discharged out of the inner cooling oil cavity. According to the welded all-steel piston and the manufacturing method thereof, the cleanliness of the inner cooling oil cavity can be effectively improved, and the technological process is simplified.

To provide a steel piston that ensures high temperature strength even when used for an extended period in high temperature conditions.SOLUTION: A steel piston disclosed herein has an upper section with a chemical composition consisting of, in mass%, C: 0.30-0.50%, Si: 0.01-0.30%, Mn: 0.10-1.50%, P: 0.030% or less, S: 0.030% or less, Cr: 0.10-0.80%, Mo: 0.80-2.50%, V: 0.01-0.30%, Ti: 0.010-0.049%, Al: 0.005-0.100%, N: 0.020% or less, and O: 0.0050% or less, with the balance being Fe and impurities, and satisfying the formula (1). The number density ND of MC carbides at the upper section of the piston is 2.0×1022 / m3 or more. The proportion RMo of Mo content in the metal elements constituting the MC carbides, excluding Fe, is 60 atom% or more. Mo / (Mo+V+Ti)≥0.89 (1).SELECTED DRAWING: Figure 1

The utility model relates to the technical field of engines, and discloses a piston and an engine, the piston comprises a body part, a skirt part and a heat insulation ring assembly, the body part is provided with a piston top, and the skirt part is connected to one end, back to the piston top, of the body part; at least one heat insulation ring groove and a plurality of piston ring grooves are formed in the circumferential surface of the body part; the at least one heat insulation ring groove is positioned on one side, back to the skirt part, of the piston ring groove; and a heat insulation ring assembly is fixedly sleeved in each heat insulation ring groove. The piston and the engine solve the problem that the temperature of the piston ring is high.

The utility model relates to the technical field of pistons, in particular to a composite connection type piston which comprises a piston top, a piston head and a piston skirt. The piston head is located between the piston top and the piston skirt, the piston top and the piston head are of a split structure, and the piston head and the piston skirt are of an integrally-formed structure. A cooling groove is formed in the bottom end of the piston top; a sealing ring is arranged at the bottom end of the top of the piston and arranged on the periphery of the cooling groove, and a sealing groove allowing the sealing ring to be clamped therein is formed in the upper end of the piston head. The bottom end of the top of the piston is connected with two fixing plates side by side, second pin shaft holes are formed in the fixing plates, and two penetrating holes allowing the two fixing plates to penetrate through are formed in the head of the piston. An oil ring groove and two gas ring grooves are formed in the periphery of the piston head; first pin shaft holes are formed in the two ends of the piston skirt. According to the technical scheme, the piston top and the piston head are arranged in a split mode, so that the cooling groove can be conveniently machined.

The invention discloses a piston and an internal combustion engine, and relates to the technical field of internal combustion engine structures.The piston is internally provided with a cavity, the top wall of the cavity protrudes downwards to form an annular boss, the annular boss surrounds the inner side wall of the cavity in the circumferential direction, and an annular oil cavity is formed in the position, close to the top, of the annular boss; a plurality of oil collecting holes communicated with the oil cavity and the cavity are formed in the bottom of the annular boss, each oil collecting hole comprises an equal-diameter section and an expansion section which are communicated with each other, the end, away from the expansion section, of the equal-diameter section is communicated with the oil cavity, the end, away from the equal-diameter section, of the expansion section is communicated with the cavity, the end, connected with the equal-diameter section, of the expansion section is a first end, and the other end is a second end; the expansion section is gradually expanded from the first end to the second end, and a porous medium is arranged on the inner wall of the equal-diameter section in the circumferential direction of the equal-diameter section. According to the piston, the utilization rate of cooling oil is increased; and the porous medium is arranged, so that rebound and splashing of the cooling oil are greatly inhibited, the loss of the cooling oil is avoided, and the working temperature of the piston is remarkably reduced.

The piston comprises a pair of piston bodies, the piston bodies are symmetrically arranged and connected through a welding seam, a pair of supports are symmetrically arranged in the piston bodies, a tensioning assembly is arranged between the supports, the tensioning assembly comprises an adjusting frame, the adjusting frame is arranged between the supports, and the adjusting frame is arranged between the supports. And an adjusting groove is formed in the adjusting frame, a rotating piece is arranged in the adjusting groove, and the center of the rotating piece penetrates through and is fixedly connected with a two-way lead screw. According to the piston with the inner portion and the outer portion symmetrically welded, the limiting frames are inserted into the support, the rotating piece in the adjusting groove is rotated to drive the two-way lead screw to rotate, the two-way lead screw drives the moving blocks to be close to each other along the limiting rods, and meanwhile the moving blocks drive the limiting frames to be close to each other and tension the support. The connection strength between welding seams of the piston body is enhanced through the support, and the stability of the device is improved.

To strengthen a tumble flow in a combustion chamber.SOLUTION: An engine of one embodiment, being an engine having a cylinder main body has a cylinder head which is attached to the cylinder head, and in which an intake port and an exhaust port are formed, and a piston accommodated in a cylinder bore of the cylinder main body, and defining a combustion chamber between the cylinder head and itself. The piston comprises a first piston inclination face which is formed at an external peripheral edge part of a piston crown face, and inclines while approaching the cylinder head as approaching an outer edge of the piston crown face. The piston comprises a second inclination face which is formed at the external peripheral edge part of the piston crown face, and inclines while separating from the cylinder head as approaching the outer edge of the piston crown face.SELECTED DRAWING: Figure 10

The invention belongs to the technical field of piston cooling devices, and particularly relates to an internal combustion engine piston inner-cooling oil cavity angle-variable oil injection system which comprises an acquisition assembly, a control assembly and a control assembly. The oil injection assembly comprises an oil injection seat, and an oil injection nozzle is arranged on the oil injection seat; and the execution assembly comprises a control part and an execution part, the execution part is connected with the oil nozzle to drive the direction of the oil nozzle to change, and the control part controls the execution stroke of the execution part according to the working condition state information collected by the collection assembly. The oil injection angle of cooling oil can be changed along with working conditions so as to change the oil charge rate of each inner cooling oil cavity along with the working conditions, and the problems that the heat efficiency of an internal combustion engine is unstable due to the fixed oil charge rate of the inner cooling oil cavity of the piston of the internal combustion engine and the thermal deformation degrees of all parts of the piston are different due to cooling temperature difference and the service life of the piston is shortened are solved.

The invention discloses a marine diesel engine injection control method, which belongs to the technical field of fuel injection control, and comprises the following steps of: acquiring working condition parameters of a current diesel engine, obtaining a current oil injection duration and an excess air coefficient, judging that the diesel engine is in a first working condition area when the oil injection duration and the excess air coefficient do not exceed set threshold values, otherwise, judging that the diesel engine is in a second working condition area; the diesel engine is in a second working condition area; the oil sprayer is provided with an upper row of spraying holes and a lower row of spraying holes, and the upper row of spraying holes and the lower row of spraying holes are controlled by the two needle valve systems respectively. When the diesel engine is in a first working condition area, only the lower row of spraying holes are opened, and when the diesel engine is in a second working condition area, the upper row of spraying holes and the lower row of spraying holes are opened; according to the design, different injection strategies can be accurately adopted according to different working conditions of the diesel engine, the combustion requirement is met, the air utilization rate in the whole combustion space can be effectively increased, and emission and oil consumption are reduced.

Internal combustion engine (1) for a motor vehicle, comprising at least one piston (4) movably arranged in a cylinder (2) of the internal combustion engine (1) with respect to a longitudinal central axis (3) of the cylinder (2), which together with a cylinder roof (6) and a cylinder wall (5) encloses a combustion chamber, wherein a piston bowl (7) extending through an end face (8) of the piston and open towards the combustion chamber is formed in the piston and an ignition device (9) is arranged on the cylinder roof (6), which has a pre-chamber (10) fluidically connected to the combustion chamber, wherein the end face (8) has a displacement surface (12) adjoining a piston bowl edge (11) of the piston bowl (7) and a displacement counter-surface (13) opposite the displacement surface (12) is formed on the cylinder roof (6),wherein the displacement surface (12) and the displacement counter-surface (13) together with the cylinder wall (5) define a displacement area of ​​the combustion chamber which surrounds the pre-chamber (10) in an annular manner, characterized in that a maximum diameter of the piston bowl (7) is at most 75% of a cylinder diameter of the cylinder (2).

The application discloses a piston, an internal combustion engine, an internal combustion engine control system and an internal combustion engine control method, relates to the technical field of optimal design of internal combustion engine pistons, and the piston comprises a piston body, an outer surface of a piston skirt of the piston body is processed with a bionic hole array, rows of the bionic hole array are staggered, and columns of the bionic hole array are staggered, wherein the bionic holes in odd-numbered rows are pits, the bionic holes in even-numbered rows are through holes, or the bionic holes in odd-numbered rows are through holes, and the bionic holes in even-numbered rows are pits, the bionic holes in the same row in the bionic hole array are of the same hole diameter, the hole diameter of the bionic holes gradually decreases along the axial direction of the piston skirt, and the hole diameter of the bionic holes gradually decreases from the top of the piston skirt to the bottom of the piston skirt, the row spacing gradually decreases, and the column spacing in the bionic hole array is the same. The bionic non-smooth structure is applied to the piston skirt of the internal combustion engine, so that the piston is optimally designed, the piston can be better optimally designed, and the performance of the piston is improved.