255 results about "Steel piston" patented technology

A piston and method of construction is provided. The piston includes a top part fixed to a bottom part. The top part has an uppermost surface with annular inner and outer upper joining surfaces depending therefrom. The bottom part has a pair of pin bosses with pin bores aligned with one another along a pin bore axis; a pair of upwardly extending annular inner and outer lower joining surfaces and a combustion bowl wall. Inner and outer weld joints fix the inner and outer upper and lower joining surfaces to one another. An annular cooling gallery is formed laterally between the upper and lower joining surfaces. The inner weld joint joining the top part to the bottom part is located within the combustion bowl wall and configured to minimized the compression height of the piston.

A piston and method of construction is provided. The piston includes a top part fixed to a bottom part. The top part has an uppermost surface with annular inner and outer upper joining surfaces depending therefrom. The bottom part has a pair of pin bosses with pin bores aligned with one another along a pin bore axis; a pair of upwardly extending annular inner and outer lower joining surfaces and a combustion bowl wall. Inner and outer weld joints fix the inner and outer upper and lower joining surfaces to one another. An annular cooling gallery is formed laterally between the upper and lower joining surfaces. The inner weld joint joining the top part to the bottom part is located within the combustion bowl wall and configured to minimized the compression height of the piston.

An integrally cast steel piston for internal engines, the cast steel having (a) a composition comprising 0.8% or less of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 3% or less of Ni, 6% or less of Cr, 6% or less of Cu, and 0.01-3% of Nb, the balance being substantially Fe and inevitable impurities, or (b) a composition comprising 0.1-0.8% of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 10% or less of Ni, 30% or less of Cr, 6% or less of Cu, and 0.05-8% of Nb, the balance being substantially Fe and inevitable impurities, by mass.

A laser-welded single-piece forged-steel piston with an enclosed inner oil cooling chamber having the advantages of simple structure and easy manufacturing process, and capable of satisfying the requirement of engines for high power, high rigidity, and low discharge development, and its manufacturing process. The laser-welded single-piece forged-steel piston of the invention comprises a piston body member and a piston ring member, wherein the piston body member is welded together with the piston ring member through laser welding procedure, an enclosed inner oil cooling chamber is formed between the piston body member and the piston ring member, and is connected with the piston inner cavity by means of at least two oil inlet/outlet holes, and a pin hole is opened at the lower portion of the piston body member.

An on/off clutch assembly is disclosed having a two component spring end cap. The spring end cap includes a steel cap portion and a non-metallic portion. The non-metallic portion extends along the entire length of the steel cap portion and is located between the steel cap portion and the piston rod. The new design insulates the steel piston rod from the steel spring end cap. This results in reduced corrosion of seals within the clutch assembly and contributes to improved conditions for bearings within the clutch assembly.

In a corner portion (2) defined between an outer peripheral surface (4) and a lower-side surface (3) of a steel piston ring (1), a groove (5, 6) having either an approximately quadrangular shape with a length of one side of 0.05 to 0.4 mm or an approximately quarter circular shape having a radius of 0.05 to 0.4 mm is formed. A sharp edge (9) formed by the groove (5, 6) performs an oil scraping function and the groove (5, 6) works to reduce an oil pressure of a second land or a third land clearance between the cylinder bore and the piston.

A piston for a diesel engine is provided. The piston includes a thermal barrier coating applied to a crown formed of steel. A layer of a metal bond material is first applied to a combustion surface of the crown, followed by a gradient structure including a mixture of the metal bond material and a ceramic material, followed by a layer of the ceramic material. The ceramic material includes at least one of ceria, ceria stabilized zirconia, yttria stabilized zirconia, calcia stabilized zirconia, magnesia stabilized zirconia, and zirconia stabilized by another oxide. The thermal barrier coating is applied by a thermal spray process or HVOF. The thermal barrier coating has a porosity of 2% by vol. to 25% vol., based on the total volume of the thermal barrier coating, a thickness of less than 1 mm, and a thermal conductivity of less than 1.00 W/m·K.

A piston for an internal combustion engine is provided. The piston includes a thermal barrier coating applied to a crown formed of steel. According to one embodiment, a bond layer of a metal is applied to a combustion surface of the crown, followed by a mixed layer of metal and ceramic with a gradient structure, and then optionally a top layer of metal. The thermal barrier coating can also include a ceramic layer between the mixed layer and top layer, or as the outermost layer. The ceramic includes at least one of ceria, ceria stabilized zirconia, yttria, yttria stabilized zirconia, calcia stabilized zirconia, magnesia stabilized zirconia, and zirconia stabilized by another oxide. The thermal barrier coating is applied by thermal spray, HVOF, or wire arc spraying. The thermal barrier coating preferably has a thickness less than 200 microns and a surface roughness Ra of not greater than 3 microns.

A steel piston ring and a steel cylinder liner are described which comprise as the main body a steel composition which has good nitridability. The steel composition consists of the following elements: 0-0.5 weight % B, 0.5-1.2 weight % C, 4.0-20.0 weight % Cr, 0-2.0 weight % Cu, 45.30-91.25 weight % Fe, 0.1-3.0 weight % Mn, 0.1-3.0 weight % Mo, 0-0.05 weight % Nb, 2.0-12.0 weight % Ni, 0-0.1 weight % P, 0-0.05 weight % Pb, 0-0.05 weight % S, 2.0-10.0 weight % Si, 0-0.05 weight % Sn, 0.05-2.0 weight % V, 0-0.2 weight % Ti and 0-0.5 weight % W. The steel piston ring and the steel cylinder liner can be manufactured in a casting process using the machinery and technology employed for the manufacture of cast iron parts.

The invention discloses a processing method of a steel piston gas ring, which comprises the following steps: winding-destressing-grooving-shaping-top line trimming-flat surface grinding-excircle boning-chroming or nitriding-top line trimming-excircle boning-top line trimming-flat surface grinding; the size of a shaped blank rod is improved by calculating pressure distribution mold lines with different ovality requirements and fully considering the mold line change caused by nitriding shrinkage, thereby the problem of gas ring deformation after procedures, such as nitridation, and the like is greatly reduced, and the finished product ratio of the product is improved. Compared with the defects of long process routes, multi-workshop crossing processing and low comprehensive finished product ratio in the casting iron gas ring, the comprehensive finished product ratio of the steel gas ring processed by using the shaped blank rod can reach up to 95 percent. By utilizing the pliability characteristic of the steel and adopting a shaped steel winding and shaping process, the invention solves the fussy machining process of cast iron material, shortens the manufacturing period, also reduces the procedure waste simultaneously and saves the process manufacturing cost.

The invention belongs to the technical field of engines and relates to an intensive-cooling steel piston of a gas engine. The piston is made from heat-resisting and high-strength 42CrMo forged steel, an inblock aluminum piston casting mode in the prior art is replaced, the bearing extremity of the piston is improved, and the working reliability of the gas engine is further improved. A combustion chamber is designed to be in a shape of a shallow basin, the specified gas compression ratio can be obtained, and the working requirement of the gas engine is met. An area defined by the piston head portion and the skirt portion is structurally utilized to design an outer cooling cavity and an inner cooling cavity, the outer cooling cavity cools an outer circle of the piston head portion and the side wall of the combustion chamber, and the inner cooling cavity cools the bottom of the combustion chamber. By the adoption of the design, the problem that a single piston cooling cavity difficultly meets the using requirement due to large heat load is solved, heat stress and heat strain produced by the piston bearing high heat load are remarkably reduced, and the fatigue life of the piston is prolonged.

A galleryless steel piston for an internal combustion engine is provided. The piston has a monolithic piston body including an upper wall forming an upper combustion surface with first and second portions. The first portion extends annularly along an outer periphery of the upper wall and the second portion defines a combustion bowl. The piston further includes undercrown surface located directly opposite the combustion bowl with an exposed 2-dimensional surface area allowing for contact of cooling oil. The exposed 2-dimensional surface area ranges from 25 to 60 percent of a cross-sectional area defined by a maximum outer diameter of the piston body. To further enhance cooling, a portion of the undercrown surface is concave or convex, such that oil is channeled during reciprocation of the piston from one side to the opposite side of the piston.

The invention provides a solid-fluid coupling voltage controlled hydrocarbon generation and expulsion simulating experimental device. In the device, a high pressure kettle is formed by a high pressure kettle body which is connected with a high pressure kettle top cover and a high pressure kettle base respectively, wherein a vertical pressurizing column is axially arranged in the middle of the high pressure kettle; a three-way valve is connected between the high pressure kettle and a high pressure pipeline in a high pressure buffer which is provided with a piston; the high pressure buffer is connected with a fluid pressure control pump pipeline; a two-way valve with a switch is connected to a connecting pipeline of the three-way valve and a gas collecting device; a stainless steel piston is arranged in the high pressure buffer, and distilled water for controlling pressure and stratum simulated fluid are filled in cavities at two sides of the stainless steel piston; an upper connecting hole and a lower connecting hole on the high pressure reacting kettle are communicated through the high pressure pipeline; and the high pressure pipeline is communicated with the three-way valve.

A piston for an internal combustion engine is provided. The piston includes a piston body which is made of steel. The piston body has a crown portion with an upper combustion surface, a pair of skirts which depend from the crown surface, a pair of pin bosses for receiving a wrist pin and a plurality of pin boss bridges which extend from the pin bosses to the skirts. Each of the pin boss bridges extends axially to a lower end which is opposite of the crown portion and has a rib with an increased thickness at its lower end. At least one of the pin boss bridges has a generally flat counter-bore surface for providing a reference location for machining of the piston body.

The invention discloses a magnetic steel piston type magneto-rheological damper with double ejection rods, comprising a working cylinder, a piston and two piston rods; the working cylinder is filled with magneto-rheological fluid; the piston is made of magnetic steel, two piston rods are both made of non-magnetic materials, a magnet exciting coil and a magnetizing-demagnetizing coil are wound in the middle of the piston, and the magnetic steel piston can be magnetized and demagnetized by controlling a power source, therefore, the magnetic steel piston has certain magnetic field intensity and the magnetic steel piston type magneto-rheological damper with double ejection rods has certain output damping force, and the output damping force of the magnetic steel piston type magneto-rheological damper with double ejection rods is regulated by changing the size and the direction of current input to the magnet exciting coil of the magnetic steel piston.

The invention discloses a steel piston with an inner cooling oil channel formed by laser welding and a processing method thereof. The steel piston includes a piston body and an annular sealing plate. The piston body is provided with an inner cooling oil passage and a combustion chamber on the piston head. The upper end of the inner cooling oil passage is provided with an annular opening. The annular opening is located at the top of the piston head. The annular sealing plate It is embedded in the annular opening and fixed by laser welding, and the upper end of the inner cooling oil passage is sealed. The method includes the following steps: S1: parts processing; S2: laser welding assembly: including preheating the annular sealing plate and the annular opening; forming an interference fit when the annular sealing plate and the annular opening are cooled to normal temperature; The sealing plate is preheated as a whole before welding; laser welding is performed on the annular sealing plate and the inner and outer ring interfaces of the annular opening; slow cooling after welding; S3: heat treatment; S4: post-processing. It has the advantages of convenient processing, can effectively improve the cooling performance of the piston, prolong the service life, reduce the weight of the piston and improve the working performance.

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.

The invention discloses an integrated type cast steel piston, wherein a side window type weight losing area is arranged in a piston skirt part; the weight of the integrated type cast steel piston is decreased by more than 15% to 20%; in such a way, the weight of the integrated type cast steel piston is enabled to approach the weight of an aluminum alloy piston of the same type; and therefore, the requirement on the light weight of an engine is met. The invention also discloses a manufacturing method of the integrated type cast steel piston, wherein the method mainly comprises the following steps: casting a piston blank, and casting out the side window type weight losing area, a pin hole, a sealed cooling cavity, a cooling oil outlet and a cooling oil inlet; performing heat treatment on the piston blank; processing out a combustion chamber concave pit, a piston head, the piston skirt part and an annular groove area in the piston blank which undergoes the heat treatment; and performing overall phosphating on the piston. With the adoption of the method provided by the invention, the production technology of the integrated type cast steel piston is simplified, the production efficiency is improved, and the production cost is simultaneously lowered.

A one-piece steel piston that is made from a piston blank that includes a portion that configured and designed to be displaced to form a cooling gallery and ring belt. The piston blank can be formed by a casting or forging process. The portion that is designed and configured to be displaced is a flange that extends radially at the top of the piston blank. The flange is bent downward so that a peripheral edge of the flange contacts a top portion of the piston skirt. The peripheral edge of the flange and the top portion of the skirt can be welded together or provided with inter-engaging structures.

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 oil gallery channel is first forged 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 forged condition.

The invention discloses titanium alloy. The titanium alloy comprises, by mass, 5.5-6.5% of Al, 0.5-1.5% of Mo, 3.5-4.5% of V, less than 0.25% of Fe, less than 0.15% of O and the balance Ti. A process method for manufacturing a piston and connecting rod set through the titanium alloy includes the first step of smelting and ingot casting, the second step of forging, the third step of heat treatment, the fourth step of machining, the fifth step of ultrasonic flaw detection and the sixth step of finished product forming. Finish machining and rough machining are sequentially adopted for a titanium alloy piston top; surface grinding is adopted for a titanium alloy piston ring and a titanium alloy piston pin; turning is adopted for a titanium alloy connecting rod; and for a titanium alloy connecting rod bolt, a turning rod is adopted, a bolt blank is formed in an upsetting manner, and then finish machining is performed. According to the titanium alloy, the weight of a diesel engine piston system of a diesel locomotive is reduced by 35-50%, the strength is higher than that of a steel piston pin, the service life is longer than that of a steel piston pin, and the corrosion resistance is much better than that of a steel piston pin.

The invention discloses a welded-type integral forged steel piston and a manufacturing process thereof. The welded-type integral forged steel piston comprises a piston head and a piston skirt which are formed by forging and fixedly connected; a closed cooling oil cavity is formed between the piston head and the piston skirt and communicates with the exterior through an oil inlet hole and an oil outlet hole; an annular inner welding shoulder A and an annular outer welding shoulder A are coaxially arranged at the bottom end of the piston head, and an annular inner welding shoulder B and an annular outer welding shoulder B which are matched with the inner welding shoulder A and the outer welding shoulder A correspondingly are coaxially arranged at the top end of the piston skirt; the inner welding shoulder A and the inner welding shoulder B are welded through friction welding to form a main welded seam; and the outer welding shoulder A and the outer welding shoulder B are welded through fusion welding to form an auxiliary welded seam. According to the welded-type integral forged steel piston and the manufacturing process thereof, the structure is reasonable, safety and reliability areachieved, and the production efficiency is high.