Rocker arm, rocker arm assembly, engine and engineering machinery

Abstract

The invention provides a rocker arm, which is matched with the valve of an engine. The rocker arm comprises a rocker arm body and a head part, wherein the head part is arranged at one end of the rocker arm body, which is matched with the valve; and the head part is a double curved surface. The invention further provides a rocker arm assembly, the engine and engineering machinery. When the rocker arm with the structure is matched with the valve, a contact line of the head part and the valve is always on the center line of the valve, so that the problem of eccentric abrasion of a duct and a housing washer of the valve is solved, and the problems of valve leakage, steam blowby increase of a crankcase and engine oil blowby existing in relevant technologies are avoided. Therefore, the stability and the safety of the engine are improved.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to an engine rocker arm, a rocker arm assembly, an engine and construction machinery. Background technique [0002] At present, the shape of the head of the traditional valve rocker arm is a regular arc surface. During the movement of the valve rocker arm, the distance between the contact line between the head of the rocker arm and the tail of the valve stem relative to the center of the valve is constantly changing. Such as figure 1 As shown, in the whole valve opening process of a certain 3L four-valve diesel engine, at the beginning, the offset distance of the contact line between the rocker arm 1’ and the valve 2’ relative to the valve center line 3’ is a’; figure 2 As shown, at the maximum valve lift, the offset of the contact line between the rocker arm 1' and the valve 2' relative to the valve centerline 3' is b', where the distance from the valve centerline 3' to the ...

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: During the entire opening process of the valve, the contact line between the rocker arm and the valve always deviates from the center line of the valve (except for passing through the center line at the moment of movement), the valve Always affected by the lateral force, it is easy to cause eccentric wear of the valve guide and valve seat ring, resulting in air leakage from the valve, increased blow-by of the crankcase, and oil blow-by.

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