Method for reducing heat load and mechanical load of piston ring
A mechanical load and thermal load technology, applied to pistons, mechanical equipment, engine components, etc., can solve the problems of high thermal load and mechanism load, jamming, and shorten the service life of piston rings, so as to reduce thermal load and mechanical load, Increased service life and reduced operating costs
Inactive Publication Date: 2009-05-27
YANGDONG CO LTD
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Problems solved by technology
At present, the fire bank of the piston (that is, the position from the notch of the first ring to the top of the piston) is directly connected with the matching gap between the cylinder liner and the engine combustion chamber, and the impact force and impact heat load of the engine gas explosion directly act on the On the first piston ring, the heat load and mechanism load of the first ring are too high, causing damage, jamming, and even cylinder scuffing, which shortens the service life of the piston ring and affects the performance and operating cost of the engine.
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[0008] Referring to the accompanying drawings, process ring-shaped steps on the end faces of the piston 1 and cylinder liner 2 designed according to the regulations, which are located outside the notch of the first piston ring 3, and press the processed heat-resistant ring 4 into the end face of the cylinder liner. Step, the outer end face is flush, and the step height h at the piston end face 轴 , The step height h at the end face of the cylinder liner 孔 , The gap between the inner hole of the heat resistance ring and the outer circle at the step of the piston end face a 1 The relationship between the three is: h 轴 =h 孔 +a 1 , where a 1 Equal to the clearance a between the cylinder and the piston 2 , in this case, a 1 =a 2 =0.07mm, h 轴 It is equal to 4 / 5 of the height of the fire bank, and the heat-resistant ring is made of 4Cr9Si2 heat-resistant alloy.
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The invention discloses a method for reducing heat load and mechanical load of a piston ring, which comprises the following steps: processing a ring-shaped step at the end faces of a piston and a cylinder sleeve respectively, and pressing a processed heat-resistant ring into the step at the end face of the cylinder sleeve in interference, wherein the relation among a height h (axis) of the step on the end face of the piston, a height h (hole) of the step on the end face of the cylinder sleeve and a gap a1 between the heat-resistant ring and an external circle of the step on the end face of the piston is as follows: the h (axis) is equal to the sum of the h (hole) and the a1, wherein a1 equals to a gap a2 between the cylinder sleeve and the piston. The method changes a straight way type of the gap at a matched part of a fire bank of the piston and the cylinder sleeve into a labyrinth type, prevents high-temperature and high-pressure fuel gas from directly impacting a first piston ring when the piston produces fuel gas explosion nearby an upper dead point, so as to reduce the heat load and the mechanical load of the piston ring, and improve service life of the piston ring and service performance of the engine.
Description
technical field [0001] The invention relates to an assembly method of an engine piston and a cylinder liner, in particular to a method for reducing heat load and mechanical load of a piston ring. Background technique [0002] Usually there is always a gap between the engine piston and the cylinder liner, which is sealed by a three-way piston ring mounted on the top of the piston. At present, the fire bank of the piston (that is, the position from the notch of the first ring to the top of the piston) is directly connected with the matching gap between the cylinder liner and the engine combustion chamber, and the impact force and impact heat load of the engine gas explosion directly act on the On the first piston ring, the heat load and mechanism load on the first ring are too high, causing damage, seizure, and even cylinder scuffing, which shortens the service life of the piston ring and affects the performance and operating cost of the engine. Contents of the invention ...
Claims
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IPC IPC(8): F02F1/00F02F3/00
Inventor 姜永荣
Owner YANGDONG CO LTD