18 results about "Steel piston" patented technology

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 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.

The invention discloses a preparation process of a light-weight high-strength fine-grain steel piston, and belongs to the technical field of preparation of light-weight high-strength materials. According to the high-strength light-weight steel piston, 38MnVS6 steel is adopted as a finished product material, and the preparation method comprises the steps of sample upsetting and blank finish forging; carrying out friction welding treatment; performing multi-stage rapid heating and cooling heat treatment; and a tempering treatment process. The steel comprises the following chemical components in percentage by weight: 0.3 to 0.45 percent of C, 1.4 to 1.6 percent of Mn, 0.18 to 0.26 percent of Si, 0.01 to 0.015 percent of P, 0.04 to 0.05 percent of S, 0.12 to 0.2 percent of Cr, 0.08 to 0.1 percent of Cu, 0.018 to 0.026 percent of Al, 0.06 to 0.09 percent of V, 0.02 to 0.04 percent of La, 0.03 to 0.05 percent of Ce, 0.01 to 0.02 percent of Y and the balance of Fe. And finally, the lightweight piston with high tensile strength, yield strength, fatigue strength and the like is prepared, a workpiece of the lightweight piston can be used for a high-performance diesel engine or a ship engine, and the lightweight piston has a good industrial application prospect.

The invention relates to the field of steel piston phosphating treatment, in particular to a steel piston phosphating treatment method and system. According to the steel piston phosphating treatment method provided by the invention, through forced liquid drainage and synchronous purification, no liquid accumulation in a complex inner cavity is ensured, the defects of cross contamination and piebaldness are avoided, and the core pain point of steel piston phosphating is fundamentally solved; through the combined action of forced liquid drainage and synchronous purification, the thickness difference of phosphating films on the inner cavity and the outer surface of the piston subjected to phosphating treatment is smaller than 1 micron, corrosion resistance is uniform, and the product quality consistency is improved.

The utility model relates to the technical field of metal forging, and discloses a combined type cooling forming tool of a forged steel piston blank, which comprises a forging die, a plurality of cooling cavities are arranged in the forging die, and water supply mechanisms for injecting cold water into the cooling cavities are arranged on two sides of the forging die. A concentrated water return mechanism for converging cooling water is arranged at the bottom end of the forging die, a die cavity is formed in the middle of the top end of the forging die, and a cooling fan for air cooling of the top end of the piston blank is arranged at the top end of the die cavity; the water supply mechanisms are arranged on the two sides of the forging die, cooling water can be input into the cooling cavity in a staggered mode from different directions, the piston blank cooling uniformity is improved, the phenomenon that due to insufficient cooling of the flowing tail end, the piston blank shrinks and deforms is avoided, and the piston machining quality is improved; and the output cooling water can be converged through the centralized water return mechanism.

This invention relates to the field of seismic isolation bearing technology, specifically a horizontal seismic isolation bearing based on air springs, comprising a lower connecting steel plate, an upper connecting steel plate, a lead-core rubber bearing element, a supporting sliding element, a sector-shaped air spring, and a dust cover. The lead-core rubber bearing element is fixedly connected to the upper part of the supporting sliding element, and the supporting sliding element and the lower connecting steel plate are connected through sliding contact, forming a sliding friction pair. Multiple sector-shaped air springs are arranged circumferentially around the supporting sliding element, and the outer sides of the sector-shaped air springs are connected to steel limiting rings fixed to the lower connecting steel plate. The sector-shaped air springs are internally equipped with limiting devices and buffer rubber to prevent excessive displacement and compression damage. A dust cover is installed on the upper part of the steel piston rod of the sector-shaped air spring. The bearing of this invention can automatically adjust its working state according to the earthquake intensity, primarily using sliding and air springs during minor earthquakes, and activating the lead-core rubber for energy dissipation during major earthquakes, achieving intelligent graded seismic isolation.

The invention discloses a steel piston ring groove stepped wear-resistant coating based on laser additive manufacturing and a preparation method of the steel piston ring groove stepped wear-resistant coating, and belongs to the technical field of material science and laser additive manufacturing. The wear-resistant coating is obtained by coating Fe-based soft transition powder and Fe-based hard wear-resistant powder, and the Fe-based soft transition powder comprises the following components in percentage by weight: 21 to 23 percent of Cr, 4 to 5 percent of Si, 1.5 to 2.5 percent of Mo, 12 to 14 percent of Ni, 0.1 to 0.2 percent of C, 1.4 to 1.8 percent of B and the balance of Fe; the Fe-based hard wear-resistant powder is prepared from the following components: 31 to 33 weight percent of Cr, 3.6 to 4 weight percent of Si, 1.8 to 2.1 weight percent of Ni, 3.8 to 4 weight percent of C, 1.8 to 2 weight percent of Cu, 0.3 to 0.5 weight percent of CNT, 0.3 to 0.5 weight percent of BNNT and the balance of Fe. The wear-resistant coating has a stepped structure of the soft transition layer and the hard working layer, so that the internal stress of the coating is reduced, and the bonding strength of the coating is improved; meanwhile, the high-heat-conduction phase is added and matched with the SiC hard particles, so that the performance of a high-fatigue area of the steel piston ring groove can be greatly improved, and the service life of the steel piston is prolonged.

The utility model relates to the technical field of piston welding machining, in particular to an auxiliary tool matched with piston welding machining and a piston welding device.The auxiliary tool comprises an air inlet pipeline, an air outlet pipeline and a slag collecting box; one end of the air inlet pipeline is connected with the cooling cavity inflow connector, the other end of the air inlet pipeline is connected with an external air source, and an air inlet valve for controlling air to enter is arranged in the air inlet pipeline; one end of the air outlet pipeline is connected with the cooling cavity outflow connector, and the other end of the air outlet pipeline serves as an air outlet. And a connected slag collecting box is arranged at the middle end of the gas outlet pipeline. The tool can help to solve the problems that welding slag is splashed in a cooling cavity in the electron beam welding process of an all-steel piston and the surface of an oil cavity on the side is ablated by a welding seam, airflow circulation is formed in the oil cavity of the all-steel piston, electron beams in the welding process are diluted through gas, the energy density of the electron beams is reduced, and ablation to the surface of the oil cavity is reduced; and meanwhile, the welding slag is rapidly cooled in the airflow and collected into the slag collecting box, and the problem of welding slag removal is effectively solved.

The utility model provides an automatic alignment double-station multi-angle drilling and boring clamp for steel pistons. The automatic alignment double-station multi-angle drilling and boring clamp comprises a turnover workbench, two three-jaw chucks, a plurality of positioning pins, two pistons, a positioning core rod, a positioning block and a positioning screw. The two three-jaw chucks are symmetrically installed on the surface of the overturning workbench. The two pistons are respectively arranged above the two three-jaw chucks, and the plurality of positioning pins are respectively arranged between the two three-jaw chucks and the two pistons; the positioning core rod is connected into the piston in a pluggable mode. The positioning block is mounted on the surface of the three-jaw chuck; and the positioning screw is mounted on the positioning block. According to the steel piston automatic alignment double-station multi-angle hole drilling and boring clamp, machining position degree deviation caused by manual clamping is effectively avoided, the position accuracy of steel piston machining is greatly improved, the requirement of equipment such as an engine for high precision of the steel piston can be better met, and the production efficiency is improved. And the product quality of the steel piston is improved.

A hot forging steel piston skirt trimming-punching-finishing three-in-one device and processing method for inhibiting hot deformation belong to the technical field of mechanical processing, and are directed to trimming punching production process control of hot forging steel piston skirt forgings with flash or needing punching or both. The four process controls of holding, trimming, punching and finishing of the hot forging steel piston skirt are realized through mutual cooperation of three high-temperature-resistant die springs, and the precision of the piston skirt is greatly improved. The trimming device is simple in structure and safe, can be classified according to different specifications of different cylinder diameter piston skirts, and can meet the high-precision trimming requirements of all hot forging steel piston skirts. The present application innovatively proposes the technical scheme of "three sets of customized rectangular springs cooperative control + synchronous composite process", and for the first time realizes "one clamping and three processes completed simultaneously" of the hot forging steel piston skirt, solves the hot deformation and efficiency bottleneck from the aspects of process principle and structure design, and has remarkable creativity and practicality.

To provide a method of lubricating a heavy-duty Diesel engine comprising steel pistons, and a crank-case lubricant composition achieving excellent piston cleanliness.SOLUTION: A method of lubricating a heavy duty Diesel engine includes lubricating steel pistons with a lubricant composition, which lubricant composition includes, (i) a detergent system consisting of one or more alkali earth metal sulfonate detergents delivering about 0.3 to about 1 wt.% of sulfonate soap to the lubricant composition, and (ii) a dispersant system including one or more polyisobutylene succinimide dispersants delivering at least about 5 wt.% of one or more dispersants to the lubricant composition, with one or more polyisobutylene succinimide dispersants having a number averaged molecular weight of from about 1200 to about 2500 and derived from a highly reactive polyisobutylene delivering more than 650 ppm of nitrogen to the lubricant composition.SELECTED DRAWING: None

The invention discloses a lightweight cast iron piston, and relates to the technical field of pistons. The cooling oil cavity is formed in the piston body and close to the top position, and the cooling oil cavity is communicated with two oil holes formed in the bottom of the piston body. According to the light-weight cast iron piston, the cast iron material with the density lower than that of steel is selected and matched with the multi-position de-weight holes, weight reduction can be achieved from the two dimensions of the material and the structure, the weight of the piston is remarkably reduced compared with that of a steel piston of the same model, reciprocating inertia force is reduced accordingly, the load of an engine bearing is greatly reduced, and the service life of the bearing is effectively prolonged; meanwhile, the machining precision of the de-weighting hole is strictly controlled by means of a three-coordinate measuring instrument in the detection process, local stress concentration caused by a de-weighting structure is avoided, the stress peak value of the key part of the piston is controlled within the reasonable range of cast iron yield strength, and it is ensured that the structure reliability is not sacrificed; and the high-load requirements of high-power internal combustion engines such as commercial vehicles and engineering machinery are met.

This invention discloses a perforated turbulence-type internal cooling oil cavity structure and a steel piston for a high-strength diesel engine. It utilizes a perforated plate-type turbulence-type crown internal cooling oil cavity (3) with circumferentially arranged perforated plate-type turbulence-type components (4) on its outer wall. Flow holes (5) are uniformly opened on the perforated plate-type turbulence-type components (4). The perforated plate-type turbulence-type components (4), in conjunction with the flow holes (5), organize the oscillating oil flow, enhancing near-wall heat transfer and suppressing stagnant dead zones. Simultaneously, the flow holes (5) reduce weight, achieving a combination of improved heat transfer and lightweight design. The included angle of the perforated plate-type turbulence-type components (4) is 90°–150°, and it is at the same height as the first annular groove, directionally scouring the top surface and inner high-heat wall surface of the oil cavity. The minimum wall thickness between the oil cavity and the top, inner cavity, and inner annular surface of the first annular groove is ≥1.5 mm, ensuring strength and fatigue life. The structure can be manufactured by split forging, and the assembly of the turbulence components and the encapsulation of the internal cooling oil cavity are achieved through two laser welding processes. This significantly improves the heat transfer area and heat transfer coefficient, reduces the peak temperature and thermal stress, and achieves weight reduction.

A steel piston (10) for an internal combustion engine includes a cooling cavity (20) extending in a rotationally symmetrical manner about the piston axis and at least three annular grooves (12, 14, 16), wherein the third annular groove (16), as viewed from the piston crown (18), has a greater depth (T3) than the depth (T2) of a second annular groove (14).

1. Name of the product in this design: Stainless steel piston (one-piece perforated heat dissipation). 2. Purpose of this design: For use in pistons for internal combustion engines. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

This application discloses an all-steel piston, including a piston body, a piston pin bore, and an internal oil cavity. The inner wall of the piston pin bore is provided with two symmetrically distributed crescent-shaped structures and two groove structures; the groove structures communicate with the crescent-shaped structures. The piston body has at least two through holes, which connect the internal oil cavity with the inner cavity of the piston body, and the through holes are symmetrically arranged in the inner cavity of the piston body. By providing a combination structure of through holes, crescents, and grooves in the existing piston structure, the cooling lubricating oil in the oil cavity can be better guided to flow into the connecting rod and piston pin, providing lubrication for the contact between the piston pin bore and the connecting rod and piston pin, effectively reducing the risk of seizure. This solution takes into account both lightweight design and manufacturing quality, while reducing the risk of piston failure in the engine.

The utility model relates to turning and grinding composite equipment for machining an outer circle and an annular groove of a steel piston, and belongs to the technical field of piston machining equipment. The equipment comprises a base, a stand column, a left planker, a right planker, a left workbench, a right workbench, a tool turret, a static pressure electric spindle and a rotating spindle, the stand column is arranged on one side of the base, and the left planker and the right planker are horizontally arranged on the two sides of the stand column respectively through servo lead screw systems; the left carriage and the right carriage are vertically provided with a left workbench and a right workbench through servo lead screw systems respectively, the left workbench is provided with a tool turret, the tool turret is provided with a machining tool, the right workbench is provided with a static pressure electric spindle, the lower end of the static pressure electric spindle is provided with a grinding wheel, and the other side of the base is provided with a rotating spindle. Piston outer circle machining is completed through turning, turning is replaced by grinding when a piston ring groove is machined, the machining precision of the piston ring groove is improved, the service life of the piston ring groove is prolonged, the structure is compact, operation is convenient, and machining efficiency is high.

The invention relates to the field of diesel engines, in particular to a multi-partition cooling steel piston suitable for a highly strengthened diesel engine, which comprises a piston, at least two layers of mutually communicated inner cooling oil ducts are axially arranged in the head of the piston, and an oil inlet and an oil outlet are formed in the bottommost inner cooling oil duct. Cooling engine oil enters from the oil inlet, then flows upwards, sequentially passes through the inner cooling oil channels in all layers and finally flows out from the oil outlet hole, and a circulation path capable of cooling the second piston ring groove is formed. By constructing a multi-partition cooling structure, targeted precise cooling of the second piston ring groove is achieved, the temperature of the ring groove is reduced fundamentally, carbon deposition is prevented from being generated, the reliability and economical efficiency of an engine are improved, and the service life of the engine is prolonged.