Motorcycle engine vibration damping device

Abstract

A vibration damping structure for motorcycle engine is provided. A piston is connected with a small end of a connecting rod through a piston pin, the big end of the connecting rod is arranged between a left crank and a right crank through a crack pin, a left crack shaft bearing is arranged on the left crank, a right crank shaft bearing and a balancing driving gear are sequentially arranged on theright crank, the balancing driving gear is engaged with an balancing driven gear disposed at the right end of a balancing shaft, a second balancing block is equipped in the middle (deviation to the right) position of a first balancing block, the opposite faces of the shank portion of the left and right crank are symmetrically opened with two notches, and when the balancing shaft rotates, the second balancing block can pass through between the two notches of the shank portion of the left and right crank. The invention can effectively balance the reciprocating inertial force generated when the large-discharge amount motorcycle engine running, so as to essentially improve the engine vibration, improve the usage comfort, service life and reliability of the motorcycle. The invention can be arranged with no need to change the structure of crank shaft case, so as to effectively reduce the manufacturing cost of the entire motorcycle.

Description

technical field [0001] The invention belongs to the technical field of motorcycle engines, and in particular relates to a vibration damping mechanism for motorcycle engines. Background technique [0002] At present, in order to solve the problem of large vibration of motorcycle engines, a dual-axis balance mechanism or a single-axis balance mechanism is generally used on the motorcycle engine to balance the reciprocating inertial force generated by the operation of the crank connecting rod mechanism, so as to reduce the impact of engine vibration on motorcycles. The influence of the whole vehicle ensures the comfort of driving and riding. The single-axis balance mechanism often adopts the following structure: the piston is connected to the small end of the connecting rod through the piston pin, the large end of the connecting rod is installed between the left and right cranks through the crank pin, the left crankshaft bearing is assembled on the left crank, and the right cra...

AI Technical Summary

Problems solved by technology

[0003] For large-displacement motorcycle engines, due to the increase in displacement, the rotational inertial force and reciprocating inertial force generated by the movement of the moving parts of the engine (crank-link mechanism) also increase accordingly. If the shaft balance mechanism cannot completely balance the first-order reciprocating inertial force, the purpose of reducing vibration cannot be achieved

[0004] Some large-displacement motorcycle engines use a biaxial balance mechanism to balance the reciprocating inertial force generated during the operation of the crank-link mechanism (the balance method of the rotational inertia force is the same as that of the uniaxial balance mechanism), and the biaxial balance mechanism has a complex structure and a large volume. , the original crankcase cannot be installed, and the crankcase still has to be molded again, which leads to an increase in cost. The price of the complete motorcycle is expensive, and it is difficult for users to accept it.

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