Cavity insulation titanium alloy piston and design method thereof
A titanium alloy and piston technology, applied in pistons, computing, mechanical equipment, etc., can solve the problems of overweight piston quality and inability to meet the requirements of the engine, and achieve the effect of reducing the gap between the cylinders, reducing the temperature and reducing the noise.
Inactive Publication Date: 2014-11-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0005] The purpose of this invention is to solve the problem that the traditional piston cannot meet the requirements of the engine due to its overweight or strength, and to provide a high-speed and high-strength diesel engine with a higher thermal strength (compared to steel piston), more Titanium alloy pistons that are lighter (compared to aluminum pistons), more reliable, and have better thermal insulation properties
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[0043]In order to better illustrate the purpose and advantages of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0044] Titanium alloy has excellent high and low temperature performance, and can still maintain good mechanical properties at high temperatures. The working temperature can reach 600-650 ° C, and its heat resistance is much higher than that of aluminum alloy. The specific strength of titanium alloy below 500 ℃ is also significantly better than that of stainless steel and heat-strength steel; the specific strength of titanium alloy is high, and the density is much lower than that of steel. Using titanium alloy as the piston material can produce a piston with high unit strength, good rigidity and light weight, which meets the design requirements of light weight and high strength.
[0045] Piston structure of the present invention such as figure 1...
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The invention relates to a cavity insulation titanium alloy piston and a design method thereof, is suitable for high-speed high-intensified diesel engines and belongs to the technical field of thermal energy and power engineering. The cavity insulation titanium alloy piston is made of titanium alloy and realizes heat insulation by means of a special cavity structure. The cavity insulation titanium alloy piston comprises a piston upper part, a piston lower part, a piston cavity, a pin hole, an insulation cavity and a cooling oil cavity, wherein the insulation cavity is arranged on the central axis of the piston upper part and is located among the bottom surface of a combustion chamber, the piston cavity and the cooling oil cavity, and the insulation cavity is matched with a pin boss to form the optimal load-bearing structure to transfer explosion pressure; and the insulation cavity prevents heat transfer by changing the heat transfer route for heat insulation, thereby greatly reducing the temperature of the top surface of the piston cavity. Therefore, the problems of cooling oil coking caused by high temperature and even cooling oil combustion which cannot be prevented by injection cooling are solved. The cavity insulation titanium alloy piston of the structure does not need injection cooling but splash cooling.
Description
technical field [0001] The invention relates to a piston which uses titanium alloy as a piston material and uses a special cavity structure for heat insulation and a design method thereof, which is suitable for high-speed and high-strength diesel engines and belongs to the technical field of thermal energy and power engineering. technical background [0002] At present, diesel engines are developing toward high-strength and ultra-high-strength. The power per liter has been greatly increased, and the average speed of the piston has also been greatly increased. If the mass is not controlled, the inertial force will be large, which will definitely cause vibration and noise of the diesel engine. The problem is serious, and at the same time it affects the lubrication performance between the piston and the cylinder liner, and the wear on the cylinder liner will also be aggravated, so the quality of this high-speed moving part must be controlled and minimized. It is required that t...
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IPC IPC(8): F02F3/26F02F3/16G06F17/50
Inventor 刘雨薇张卫正袁彦鹏秦朝举
Owner BEIJING INSTITUTE OF TECHNOLOGYGY