473results about "Pistons" patented technology

The utility model discloses an inner cooling oil chamber, oil cooling piston and engine, including: inner cooling oil chamber body, including oil chamber body lower part and oil chamber body upper part, oil chamber body upper part at least includes first vortex area and second vortex area, first vortex area is closer to piston center than second vortex area, and the first vortex area is closer to piston center than second vortex area. The second vortex region is closer to the piston ring groove than the first vortex region. Engine oil is sprayed into the oil inlet channel through an engine oil pump and enters the inner cooling oil cavity body through the oil inlet channel. Along with rapid and high-frequency up-and-down movement of the piston, engine oil continuously collides with the upper wall face and the lower wall face of the inner cooling oil cavity body under the action of inertia force, part of the engine oil impacts the first vortex area to form a first vortex, and part of the engine oil impacts the second vortex area to form a second vortex. The contact area of engine oil and the inner cooling oil cavity body is increased, the flowing speed of the engine oil in the vortex area is higher, a better cooling effect is generated, the temperature of a piston can be more effectively reduced, and the phenomenon that the engine oil in the inner cooling oil cavity is coked is reduced.

A piston head includes a piston head lower portion and a piston head upper portion coupled to the piston head lower portion. The piston head upper portion includes an end wall, an outer wall, and an inner wall. The end wall includes, an outer portion and an inner portion, angled with respect to the outer portion. The outer wall extends axially away from the end wall in a first direction. The inner wall extends axially away from the end wall in the first direction and is separated from the outer wall such that an outer chamber is defined between the outer wall and the inner wall and an inner chamber is defined within the inner wall. The inner wall defines one or more openings fluidly connecting the inner chamber to the outer chamber. An axis of each of the one or more openings is substantially parallel to the inner portion.

The internal combustion engine piston comprises a piston body, an inner cooling oil cavity is formed in the piston body, a groove is formed in the top of the inner cooling oil cavity and extends upwards from the top of the inner cooling oil cavity, the groove is filled with a heat conduction block, and the heat conduction block is used for conducting heat of the part, located above the inner cooling oil cavity, of the piston body to the inner cooling oil cavity. The heat conductivity of the heat conduction block is higher than that of the piston body, so that more heat is transferred to the inner cooling oil cavity from the top of the piston in unit time, the heat transfer speed of the heat of the part, located above the inner cooling oil cavity, of the piston body to the inner cooling oil cavity is increased, the heat taking efficiency of engine oil is improved, and the piston cooling capacity of the inner cooling oil cavity is improved. The problems of abnormal temperature of the piston, carbon deposition, clamping stagnation of movement of the ring group and the like are avoided, and heat dissipation of the piston in the movement process is met.

The invention relates to the technical field of internal combustion engine pistons, in particular to an eccentric inner-cooling oil cavity piston, an eccentric combustion chamber is arranged at the top, the center line of the eccentric combustion chamber and the center line of the piston are offset by the distance L1, an inner-cooling oil cavity comprises an outer ring cavity and an inner ring cavity which are communicated with each other, and the center line of the outer ring cavity and the center line of the piston are collinear; the center line of the inner ring cavity and the center line of the eccentric combustion chamber are collinear. The weight of the piston can be effectively reduced, and the overall performance is improved. Meanwhile, the surface temperature of a piston combustion chamber part can be reduced, carbon deposition layers and oxide layers on the part are reduced, and the reliability and the service life of the piston are improved.

The utility model belongs to the technical field of diesel engines, and relates to a hydrogen fuel single-cylinder engine which comprises a piston and a piston pit located at the end of the piston, and the piston pit is of a shallow-basin-shaped structure. The system further comprises a hydrogen inlet system and an electric control system, the hydrogen inlet system comprises a hydrogen sprayer, a hydrogen cylinder, a gas delivery pipe and a pressure increasing valve, the electric control system comprises a control unit, an electronic accelerator and a crankshaft position sensor, the hydrogen cylinder is communicated with the hydrogen sprayer through the gas delivery pipe, the hydrogen sprayer is communicated with the combustion chamber, and the pressure increasing valve is arranged on the gas delivery pipe. And the control unit is electrically connected with the hydrogen sprayer, the electronic throttle and the crankshaft position sensor respectively. The structure of the piston pit is improved, the electronic control gas injection system and the fuel oil injection system are adopted to replace a traditional pure fuel oil injection system, timing and quantification of hydrogen gas injection can be guaranteed, good economical efficiency is achieved, and the hydrogen gas replacement rate can reach about 90%; pollutant emission is greatly reduced, and low oil consumption is kept.

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.

The utility model relates to the technical field of engine pistons, in particular to an engine piston which comprises a piston body, the piston body comprises a top, a head and a skirt, the top, a cylinder cover and a cylinder wall jointly form a combustion chamber, and a first piston groove, a second piston groove and a third piston groove are formed in the periphery of the head. The skirt part is provided with a connecting hole for connecting a piston bolt; piston ring check blocks are arranged in the first piston groove, the second piston groove and the third piston groove and arranged in a staggered mode. A first gas ring, a second gas ring and a combined ring are respectively clamped on the first piston groove, the second piston groove and the third piston groove; the combined ring comprises a detachable ring body, an upper scraping piece, a lower scraping piece and a lining spring, wherein the upper scraping piece and the lower scraping piece are arranged on the upper side and the lower side of the ring body respectively, and the lining spring is arranged in the ring body and used for providing axial elastic force. The problem that a piston ring in a traditional engine piston is troublesome to mount and dismount is solved.

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.

The present application relates to the field of diesel engine piston forging, in particular to a diesel engine piston material, a diesel engine piston and a preparation method and a forging die thereof. The diesel engine piston material provided by the present application comprises the following components: Si: 14.1-18.3 wt%; Ni: 1.6-3.2 wt%; Fe: 0.8-1.6 wt%; Mg: 0.3-0.6 wt%; Cr: 0.01-0.05 wt%; Zn: 0.06-0.3 wt%; Ti: 0.02-0.2 wt%; Zr: 0.07-0.2 wt%; V: 0.1-0.18 wt%; Al: balance. The piston material is applied to piston preparation, the layered temperature of the forging part is maintained during the forging process, the deformation and forming performance of the piston material is improved, the linear expansion coefficient is reduced, the volume stability is improved, the thermal deformation amount is reduced, and the service life of the piston is improved.

The utility model relates to a multi-sparking plug ignition system, combustion chamber and gas engine, multi-sparking plug ignition system includes precombustion chamber and second sparking plug, precombustion chamber is provided in dome structure center, precombustion chamber is provided with first sparking plug, precombustion chamber is provided with a plurality of jet orifice at interval along the circumference, second sparking plug is provided with second sparking plug. At least one spray hole points to a high-frequency detonation area near an exhaust throat of an exhaust passage in the combustion chamber, the second spark plug and the pre-combustion chamber are arranged between the air inlet passage and the exhaust passage in a spaced mode, and the second spark plug is close to the edge of the dome structure. The high-speed jet jetted by the pre-combustion chamber in the multi-spark-plug ignition system enables flame to reach the edge of the combustion chamber as soon as possible, and the second spark plug can accelerate combustion in the nearby space, so that the multi-spark-plug ignition system can effectively improve the flame propagation speed, shorten the time for the flame to propagate to the edge of the combustion chamber and improve the combustion efficiency. Flame can reach the edge of a combustion chamber of an engine as soon as possible, and the aim of reducing the knocking tendency is achieved.

A ferrous piston for gasoline powered engines having dimensions which achieve reduced mass and improved performance is provided. The piston crown has a thickness of less than 4mm and includes valve pockets with an axial clearance between the valve pockets and an uppermost ring groove of less than 1.5mm. The pin bosses have an axial thickness of less than 3.7% of a bore diameter, which is the largest outer diameter of the piston, measured between a pin bore and the crown at 1mm from an inner face forming the pin bore. Each pin boss has a radial thickness of less than 3% of the bore diameter measured between the pin bore and a lower end of the pin boss. An undercrown surface presents a projected area of less than 45% of a total piston bore area, wherein the total piston bore area is πBD2 / 4, BD being the bore diameter.

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.

The present invention relates to a powder, method, and coating for cold spraying internal combustion engine combustion chamber components, specifically to the field of internal combustion engine technology. The powder comprises, by mass percentage, 5-15% stainless steel powder, 10-30% ceramic powder, and 55-85% elemental metal powder; the D80 particle size of the stainless steel powder is less than the D80 particle size of the ceramic powder, which is less than the D80 particle size of the elemental metal powder. The powder provided by the present invention, through the design of the powder used for cold spraying, produces a coating with excellent corrosion resistance and effectively ensures the bonding strength between the cold-sprayed coating and the cast iron internal combustion engine combustion chamber components, thereby ensuring the coating has good performance.

A piston for an internal combustion engine operable on a gaseous fuel is provided. The piston has a piston top end comprising a piston bowl for receiving at least one gaseous fuel jet from a fuel injector of the ICE, said piston bowl having a bottom section and a circumferential side section extending in an axial direction between the bottom section and a piston top end surface, wherein said bottom section comprises a protrusion segment configured to guide said at least one gaseous fuel jet. The protrusion segment further extends between spaced apart regions of the circumferential side section.

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.

A combustion chamber pit is formed in the top of the piston, and a first flow guide face and a second flow guide face are sequentially arranged on the circumferential wall face of the combustion chamber pit in the direction from the bottom face of the combustion chamber pit to the top face of the piston. The first flow guide face and the second flow guide face are in smooth transition connection to form a first circumferential flange protruding in the direction of a spray hole of the fuel injector, a plurality of radial flanges protruding in the direction of the spray hole of the fuel injector are arranged on the circumferential wall face of the combustion chamber pit in the circumferential direction at intervals, and the lower ends of the radial flanges extend to the bottom face of the combustion chamber pit. The upper end of the radial flange extends to the second flow guide face, and the part, located on the first circumferential flange, of the radial flange and spraying holes of the fuel injector are arranged in a one-to-one correspondence mode. The radial flange and the circumferential flange of the piston are matched, so that fuel jet beams are dispersed in four directions, four entrainment areas of the fuel jet beams can be formed, the fuel gas mixing speed and the heat release rate peak value are increased, the combustion efficiency is improved, and then the heat efficiency of an engine 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 provides a piston combustion chamber suitable for an opposed-piston two-stroke diesel engine, which is characterized in that the combustion chamber structure is a half-rugby-type structure, two opposed notches are formed in the edges of the two sides of a piston, the middle of the half-rugby-type structure is in a concave bowl shape, and the inner wall surface of the half-rugby-type structure is a smooth surface; the two oppositely-arranged notches are correspondingly formed in the central axis of the combustion chamber, the two oil sprayers are oppositely arranged and located at the two oppositely-arranged notches, each oil sprayer is provided with three oil spraying holes, and the oil beam included angle formed by the three oil spraying holes is smaller than the taper angle formed by connecting lines from the top faces of the oil sprayers to the center of the bottom of the boss. According to the two-stroke diesel engine, the good scavenging performance of an original combustion chamber structure can be guaranteed, oil and gas can be rapidly and fully mixed on the basis that materials of the combustion chamber are not changed, the combustion process is improved, and the combustion efficiency is improved.

The piston ring comprises a piston ring first end portion and a piston ring second end portion, and a piston ring opening is formed between the piston ring first end portion and the piston ring second end portion. At least one of the first end of the piston ring and the second end of the piston ring is provided with a piston ring groove, and the groove bottom of the piston ring groove is of a curved surface structure capable of guiding airflow to form vortexes. Air flow entering the piston ring groove flows from the opening side of the piston ring groove to the groove bottom side, and when the air flow flows to the groove bottom side, due to the fact that the groove bottom is of the curved surface structure, under the guiding effect of the groove bottom of the curved surface structure, the air flow can form vortex gas which overflows upwards. The vortex gas returns upwards and impacts the opening of the piston ring to prevent the airflow flowing downwards through the opening of the piston ring, namely, the resistance of the airflow flowing downwards through the opening of the piston ring is increased, so that the sealing effect is improved, and the air leakage is reduced.

In an opposed-piston mechanism, an intake compression cylinder and an expansion exhaust cylinder are individually provided, and a rotating perforated columnar valve and an ignition combustion chamber are formed therebetween. A valve mechanism is arranged on a cylinder side surface side, and a disk cam that moves in conjunction with crank rotation operates an intake valve and an exhaust valve on a cylinder side surface via a movable fulcrum type rocker arm. A movable structure of the rocker arm also realizes opening / closing amounts of the intake valve and the exhaust valve according to an operating situation of an engine. Since a piston pin and a piston pin can absorb variations of an engine that occur when two connecting rods are connected to one piston, the two connecting rods can be easily connected to the one piston.