Crank connecting rod apparatus based on multi-link mechanism
A crank connecting rod and multi-link technology, applied in the direction of mechanical equipment, machines/engines, etc., can solve the problem that the improvement of combustion characteristics is not effective, and achieve the effects of improving combustion quality, increasing power, and reducing pollution
Inactive Publication Date: 2010-09-29
SOUTH CHINA UNIV OF TECH
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[0005] However, the introduction of the above-mentioned mechanisms has not fundamentally changed the working mode of the diesel engine, and it has little effect on the improvement of the most important core part in the working process of the diesel engine-combustion characteristics.
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[0021] figure 1 Among them, Y is the distance from the piston to the origin O, Ax, Bx, By are the coordinates of A and B, r1, r2, r3, r4 are crank 1, connecting rod 1, connecting rod 2 3 and connecting rod ter 4 in length. In this embodiment, Ax=24mm, Bx=21.4mm, By=19.4mm, r1=8.2mm, r2=29.85mm, r3=23.5m, r4=29.83m; ω makes a uniform circular motion, driving the first connecting rod 2, the second connecting rod 3, and the third connecting rod 4 to move together, and the first connecting rod 2 swings around its own axis (point B) driven by the second connecting rod 3 , the piston 5 can only move up and down in the direction of its own axis (Y axis), and the motion law of the piston is formed under the involvement of the third connecting rod 4. When analyzing the kinematics and dynamics of the crank-connecting rod mechanism, the crankshaft can be approximately considered to be rotating at a constant speed, and various kinematic and dynamic parameters of the mechanism can be exp...
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The invention discloses a crank link device based on a multilink mechanism, comprising a crank, a piston and a connecting rod, wherein, the connecting rod consists of a first connecting rod, a second connecting rod and a third connecting rod, the crank is fixed at a fixed-point A on an engine body, the first connecting rod is connected with the crank, one end of the second connecting rod is fixedat the other fixed-point B on the engine body, the other end of the second connecting rod is moveably connected with the first connecting rod and the third connecting rod, the third connecting rod isused as a piston rod to be connected with the piston positioned above the crank, and the fixed-point of the second connecting rod is positioned slantwise below the crank. The multilink causes the characteristics of motion of the piston to be different from the traditional sinusoidal motion, and the piston can be remained for a certain time near an upper dead point, thereby providing enough time for the constant volume combustion of a diesel engine as well as providing the scheme for achieving the high rotational speed of the diesel engine for automobiles. The device can be applied to the existing high-power diesel engine and has the advantages of high safety, thermal efficiency and single-machine capacity, low exhaust pollution and wide range of application.
Description
technical field [0001] The invention relates to a crank connecting rod device of an internal combustion engine, in particular to a crank connecting rod device for an internal combustion engine based on a multi-link mechanism. Background technique [0002] In a conventional diesel engine, fuel is injected into the cylinder at some point before the piston reaches compression top dead center, followed by mixing, combustion and heat release. If the fuel supply time is too early, the ignition delay period will increase, and the fuel will start to ignite and burn during the compression stroke. At this time, due to the rapid pressure increase, the movement resistance of the piston in the compression stroke will be increased, causing the piston and the cylinder to knock . If the oil supply time is too late, the post-combustion period will be increased, and the combustion will be carried out during the gas expansion process. At this time, due to the gradual enlargement of the combu...
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IPC IPC(8): F02B75/32
Inventor 张勇潘杰唐涛莫森泉
Owner SOUTH CHINA UNIV OF TECH