843results about "Pistons" patented technology

The present invention relates to the technical field of forging, and particularly to an automated piston forging feeding robot. The automated piston forging feeding robot comprises a sliding mechanism, a supporting mechanism, a base, a telescopic mechanism, a pushing mechanism, and a gripping mechanism, wherein the sliding mechanism is fixedly mounted on a walking beam, the supporting mechanism is fixedly mounted at a lower end of the sliding mechanism, the base is movably mounted on the ground, the telescopic mechanism is fixedly mounted in the supporting mechanism, the pushing mechanism is fixedly mounted on the ground, and the gripping mechanism is fixedly mounted at a front end of the walking beam. The present invention solves the problems of the high maintenance costs and high energy consumption associated with existing hydraulic feeding methods, achieves the ejection of billets during device movement, and provides appropriate cooling to prevent sticking. When billet jumping occurs, the hydraulic feeding methods fail to grip a workpiece, which causes the workpiece to remain in a deviated state and results in a failure to correct the position of the workpiece for delivery to a forging area for further processing. The present invention suppresses billet jumping and corrects the position of the workpiece.

An internal combustion engine has a uniblock that defines a blind cylinder bore that terminates within the uniblock. A piston is inserted into the cylinder bore from a bottom end of the cylinder bore. Parallel first and second vertical planes extend along first and second lateral sides of the cylinder bore. A cylinder zone being defined between the first and second vertical planes. A crosshead is coupled to the piston. A first crankshaft has a first crankshaft axis that extends parallel to the first vertical plane and that is positioned outside of the cylinder zone. A second crankshaft has a second crankshaft axis that extends parallel to the second vertical plane and that is positioned outside of the cylinder zone. The first crankshaft is coupled to the crosshead with a first connecting rod and the second crankshaft is coupled to the crosshead with a second connecting rod.

The invention discloses a high-performance heterogeneously-welded special-shaped combustion chamber piston and a preparation method thereof, a special-basin-shaped combustion chamber and an oil duct structure are directly formed through a rolling process, and heterogeneously-connected between a head part and a skirt part of the piston is realized in combination with a nitrogen protection friction welding technology. The piston head is made of low-silicon high-chromium ferrite-based alloy, the skirt is made of quenched and tempered steel, non-quenched and tempered steel or nodular cast iron, and the welding face is designed to be in a wave shape so as to enhance the bonding strength. The preparation process comprises vacuum smelting, multi-pass rolling, precise welding and surface treatment, the combustion efficiency, the lightweight level and the reliability of the piston are remarkably improved, and the piston is suitable for high-load working conditions such as diesel engines and natural gas engines.

The invention relates to the technical field of engine casting molds, in particular to a cylinder sleeve limiting system of a high-pressure casting aluminum alloy slope type box, which comprises a mold, a core pulling device fixed on the mold and a limiting assembly connected in the mold in a sliding manner, and the core pulling device is used for driving the limiting assembly to axially move in a mold cavity; the limiting assembly comprises a sliding base connected to the mold in a sliding mode, a sliding block fixed to the sliding base and an insert fixed to the sliding block, and two symmetrically-arranged expansion blocks are connected to the insert in the diameter direction in a sliding mode. A cavity is formed in the center of the insert, an expansion pin is slidably connected into the cavity, and the expansion pin controls the end heads of the two expansion blocks to synchronously eject out or retract towards the peripheral face of the insert through axial movement. A channel is formed in the center of the expansion pin, an air inlet is formed in the sliding seat, one end of the channel is communicated with the cavity in the center of the insert, and the other end of the channel is communicated with the air inlet of the sliding seat. According to the scheme, the cylinder sleeve positioning precision of the engine box can be improved, and the casting process quality is guaranteed.

To provide a two-cycle internal combustion engine which can prevent the blow-through of an air-fuel mixture at scavenging, and can supply the air-fuel mixture which is adapted to an operation state of the engine into a combustion chamber.SOLUTION: A two-cycle internal combustion engine comprises: a fuel injection valve 25 for supplying fuel into a crank chamber 8; an intake passage 17 for sucking only air by negative pressure at an operation of a piston 4; and a scavenging passage 18 for making the crank chamber 8 and a combustion chamber 6 communicate with each other. An intake port 42 and the scavenging passage 18 communicate with each other via a piston groove 44, and air is sucked into the crank chamber 8 through the intake passage 17, the intake port 42, the piston groove 44, a scavenging port 14 and the scavenging passage 18. Then, air which passes through the intake passage 17 is introduced into the scavenging passage 18, and air which is stagnated in the scavenging passage 18 at a finish of air intake is involved in the scavenging.SELECTED DRAWING: Figure 4

An internal combustion engine, system includes an internal combustion engine for combustion of gaseous fuel and having a combustion chamber at least partially delimited by a cylinder; a reciprocating piston moveable within said cylinder between a bottom dead centre (BDC) and a top dead centre (TDC), The reciprocating piston has a piston top end comprising a piston bowl intended to form part of the combustion chamber. A controllable fuel injector is arranged to inject gaseous fuel into the combustion chamber and towards the piston bowl. A controller controls the fuel injector to inject at least one gaseous fuel jet toward a bottom surface of the piston bowl during a fuel injection period occurring prior to an ignition event of the gaseous fuel.

The invention provides a casting method of a copper-steel double-metal cylinder body, and belongs to the technical field of pump body part machining, the casting method comprises the following steps: pre-treating a steel substrate and a copper alloy, and then heating and preserving heat together; cooling is conducted, cooling is conducted in four stages, the blowing direction of the first stage cooling, the blowing direction of the third stage cooling and the blowing direction of the fourth stage cooling are all from bottom to top, the blowing direction of the second stage cooling is from top to bottom, and solidification of the molten copper is completed after the third stage cooling; and after cooling is completed, tempering treatment is conducted, and the copper-steel double-alloy cylinder body is obtained. In the cylinder body casting process, the heated cylinder body is subjected to multi-stage cooling, the gas blowing directions of different cooling stages are controlled, rapid solidification of molten copper can be achieved, the situation that the molten copper fluctuates is avoided, the solidification defect is effectively controlled, and a compact copper layer is obtained; and through the final-stage cooling and tempering process control, the matrix structure of the steel matrix is regulated and controlled, tempered sorbite is formed, and the mechanical property of the cylinder body is improved.

The utility model discloses an engine piston which comprises an inner cooling oil channel, the inner cooling oil channel is annularly arranged in the engine piston, the inner cooling oil channel comprises a bottom wall, and the bottom wall is arranged on the side, close to a pin hole, of the inner cooling oil channel; the top wall is arranged on the side, away from the pin hole, of the inner cooling oil duct, and the top wall and the bottom wall are oppositely arranged; the two side walls are connected between the bottom wall and the top wall, one side wall comprises a plurality of first arc sections and a plurality of second arc sections, the first arc sections are circular arcs protruding towards the outside of the inner cooling oil channel, the second arc sections are circular arcs recessed towards the inside of the inner cooling oil channel, and the first arc sections and the second arc sections are sequentially arranged in a staggered mode. The multiple first arc sections and the multiple second arc sections are sequentially arranged in the height direction in a staggered mode, the heat dissipation area of the inner cooling oil channel and cooling oil is increased, wave vibration can be generated when the cooling oil flows in the inner cooling oil channel, and the cooling efficiency of the cooling oil is improved.

The invention relates to the technical field of engines, in particular to a piston combustion chamber for a diesel and natural gas engine and the engine, and the piston combustion chamber for the diesel and natural gas engine comprises an omega-shaped pit. The straight opening type omega-shaped pit structure is adopted, compared with a traditional ignition type combustion chamber, the ineffective conical volume in the center of the combustion chamber is removed, the top dead center injection diffusion combustion mode is better met, the air utilization rate is higher, the compression ratio is higher, and higher heat efficiency can be better achieved; compared with a traditional necking omega-shaped diesel engine combustion chamber, a plurality of necking structures are removed, the first annular concave face and the second annular concave face are designed, the characteristic of natural gas injection is better met, the front end space of flames is fully released, the air utilization rate is increased, the heat transfer loss is reduced, and the combustion efficiency and the heat efficiency are improved; due to the design of the large-curvature concave surface, the problems of heat load concentration and particle friction caused by a sharp structure can be avoided, and the problems of out-of-control combustion, knocking and engine damage are reduced.

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 invention relates to the field of extrusion forming of piston skirts, in particular to an extrusion forming process of a large-size piston skirt of a marine diesel engine, which comprises the following steps of: placing a piston skirt raw material in a pre-forging annular die and a pre-forging lower die, pressing and moving downwards through a pre-forging convex die, forming a piston skirt pre-forging piece, taking out the pre-forging convex die, and replacing the pre-forging convex die with a finish-forging convex die; according to the method, the extrusion deformation process of the piston skirt is optimized, the internal metal deformation is smoother, the structure is more uniform, the metal flowing state of an area A with the most concentrated stress in the using process of the piston skirt is particularly improved, and the piston skirt forging is formed through downward pressing and movement of the finish-forging male die. And the overall quality is improved.

The invention relates to the technical field of cylinder sleeves and detection thereof, in particular to a burr-shaped cast-in type cylinder sleeve and a detection method thereof. The cylinder sleeve is made of cast iron and is cast into the cylinder body through a die-casting or gravity casting process, and a plurality of burrs are formed on the peripheral face of the cylinder sleeve. At least one burr meets the following conditions: in the burr-shaped cast-in cylinder sleeve, the diameter of the burr at the position 0.25 mm away from the top end is L1, and the diameter of the burr at the position 0.4 mm away from the top end is L2; and the ratio of the diameter L1 to the diameter L2 is more than or equal to 0.65 and less than or equal to 1.15. The specific shapes of the burrs are limited by limiting the diameter sizes of the two special positions, away from the top end, of the burrs, so that the binding rate between the single burrs and the cylinder body and the binding rate between the cylinder sleeve and the cylinder body are guaranteed, good heat dissipation performance between the cylinder sleeve and the cylinder body is guaranteed, and it is guaranteed that the cylinder sleeve does not deform in the working process.

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 invention provides a pure ammonia engine system and a control method thereof. The pure ammonia engine system comprises a cylinder block; the air cylinder cover covers the air cylinder body, and a combustion chamber is formed between the air cylinder cover and the air cylinder body; the glow plug comprises a heating body which extends into the combustion chamber from the center of the cylinder cover; the controller is configured to regulate and control the temperature of the hot surface of the heating body based on the operation condition of the pure ammonia engine system; the liquid ammonia ejector is inserted into the combustion chamber from the cylinder cover and is positioned on one side of the glow plug; the spark plug is inserted into the combustion chamber from the cylinder cover and is positioned on the other side, radially opposite to the liquid ammonia ejector, of the glow plug; a plurality of spraying hole sets are formed in the side, facing the heating body, of the end, extending into the combustion chamber, of the liquid ammonia ejector, so that part of liquid ammonia mist sprayed out of the liquid ammonia ejector is filled around the heating body to be ignited by a sparking plug.

The invention relates to powder, a method and a coating for cold spraying of combustion chamber parts of internal combustion engines, in particular to the technical field of internal combustion engines, and the powder comprises the following components in percentage by mass: 5-15% of stainless steel powder, 10-30% of ceramic powder and 55-85% of metal elementary substance powder; the D80 particle size of the stainless steel powder is larger than the D80 particle size of the ceramic powder and smaller than the D80 particle size of the metal elementary substance powder. According to the powder provided by the invention, through the design of the powder for cold spraying, an obtained coating has good corrosion resistance, and meanwhile, the bonding strength of the coating obtained through cold spraying and a combustion chamber part of a cast iron internal combustion engine can be effectively ensured, so that the obtained coating has good use performance.

An engine is provided with various enhanced features. For example, a 2-stroke diesel engine has a porting design that enhances the efficiency of a scavenging event. In specific embodiments, a four-piece piston is positioned in each cylinder of the engine. The four-piece piston includes a bowl, a ring retainer, a skirt, and a wrist-pin bearing. In various embodiments, fuel pumps are coupled to fuel channels or high-pressure lines to provide a constant and equal high-pressure fuel supply to engine cylinders. In more specific embodiments, the length of each of the high-pressure lines is the same. In certain specific embodiments, complimentary screws form a supercharger that further improves engine efficiency by providing high-pressure intake air to the porting process.

An internal combustion engine has a uniblock that defines a blind cylinder bore that terminates within the uniblock. A piston is inserted into the cylinder bore from a bottom end of the cylinder bore. Parallel first and second vertical planes extend along first and second lateral sides of the cylinder bore. A cylinder zone being defined between the first and second vertical planes. A crosshead is coupled to the piston. A first crankshaft has a first crankshaft axis that extends parallel to the first vertical plane and that is positioned outside of the cylinder zone. A second crankshaft has a second crankshaft axis that extends parallel to the second vertical plane and that is positioned outside of the cylinder zone. The first crankshaft is coupled to the crosshead with a first connecting rod and the second crankshaft is coupled to the crosshead with a second connecting rod.

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.

A linear electric machine includes a shaft and at least one piston assembly operably coupled with the shaft. The piston assembly includes a piston, a piston body, and an expansion chamber. The piston body defines a dome structure at the expansion chamber. The piston is a domed piston corresponding to the dome structure. The linear electric machine also includes a heater body positioned at an outer end of the expansion chamber adjacent to the dome structure. The piston body further defines an exterior surface corresponding to a shape of the dome structure. The exterior surface includes a plurality of surface features protruding therefrom and is arranged between the heater body and the dome structure. The plurality of surface features decrease a heat load across the exterior surface of the piston body.

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.

Disclosed is a piston blank (39) for a piston (8), said piston blank (39) being made at least in part of a steel alloy containing 0.5 to 2 percent by weight chromium and 2.5 to 3.5 percent by weight silicon.

The invention relates to a piston cooling nozzle and an engine, the piston cooling nozzle comprises a nozzle valve body and a plunger piston body, the nozzle valve body is provided with an oil inlet and an oil outlet, the oil inlet and the oil outlet are respectively communicated with a valve cavity of the nozzle valve body, the plunger piston body is elastically arranged in the valve cavity, and the plunger piston body is provided with an oil storage cavity communicated with the oil inlet. A flow adjusting opening is formed in the side wall, opposite to the oil outlet, of the plunger body, the flow adjusting opening is used for being communicated with the oil outlet when the plunger body moves to a first preset position in the direction away from the oil inlet relative to the nozzle valve body, and the width of the flow adjusting opening is gradually increased from the end away from the oil inlet. According to the piston cooling nozzle, by designing the shape and the size of the flow adjusting opening, the output flow of the piston cooling nozzle can change along with the change of the oil pressure, so that the cooling requirements of pistons under different working conditions are met, the structure is simple, dependence on an electric control system is avoided, and the requirement for the arrangement space is low.

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.

The present application provides an engine piston connecting rod positioning and installation structure, belonging to the technical field of piston connecting rod positioning. The engine piston connecting rod positioning and installation structure includes a piston body, a connecting component and a positioning component. The big-end collar is arranged at the bottom of the connecting rod body. The small-end collar is movably sleeved on the piston pin. The positioning component includes a crankpin, a crank body and a positioning collar. A pin hole through which the crankpin can pass is formed in the crank body. There are two crank bodies symmetrically arranged with respect to the connecting rod body. The big-end collar is movably sleeved outside the middle end of the crankpin. The crankpin sequentially passes through the two pin holes. Two symmetric threaded portions are arranged on the surface of the crankpin. The positioning collar is arranged on both sides of each crank body. The positioning collar is threadedly sleeved on the corresponding threaded portion. The engine piston connecting rod positioning and installation structure facilitates the adjustment of the distance between the big-end collar and the crank body.

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 alignment tool for a cylinder liner and a piston, comprising: a body; an inner guide surface extending along an inner diameter of the body, the inner guide surface being configured to guide the piston with respect to an inner diameter of the cylinder liner; and an axially extending projection engagement tab extending from the body, the axially extending projection engagement tab being configured to cooperate with an outer periphery of the cylinder liner.

The utility model discloses a gasoline engine cylinder body piston wear-resisting structure which comprises a cylinder body, the cylinder body is provided with a piston rod, the surface of the cylinder body is fixedly connected with two installation frames, the two installation frames are distributed oppositely in the left-right direction, and the upper end and the lower end of the right surface of the installation frame located on the right side are fixedly connected with telescopic rods. A universal joint is fixedly connected between the right end of the telescopic rod and the right end of the piston rod, a protective sleeve is fixedly connected to the penetrating position of the piston rod on the right surface of the machine cylinder body, two grooves are formed in the inner wall of the protective sleeve, the two grooves are oppositely distributed left and right, the protective sleeve is divided into a sealing area and an impurity collecting area through the two grooves, and the sealing area is located in the machine cylinder body. A sponge gasket is arranged on the surface of the piston rod, and the left end and the right end of the sponge gasket make contact with the protective sleeve and the universal joint. Through the device, the stability of the cylinder piston is improved, and the influence of impurities and collision on the piston is reduced.

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.