Pressure lubricating integral barrel-shaped tappet device

Abstract

The invention discloses a tappet device of a fuel injection pump, and particularly relates to a pressure lubricating integral barrel-shaped tappet device of the fuel injection pump. The technical scheme is as follows: the tappet device mainly comprises a supporting sleeve, a guiding key, a tappet body, a roller pin and a roller wheel, wherein the tappet body, the roller pin and the roller wheel are assembled integrally and installed in the supporting sleeve, and realize guiding and limiting in the guiding groove on the wall surface of the tappet body by the guiding key. On one hand, the pressure lubricating oil from an engine is directly injected to the roller wheel and a cam, on the other hand, the pressure lubricating oil reciprocates in the tappet component by building a pressure lubricating oil film between the supporting sleeve and the tappet body, the lubricating oil at the periphery of the tappet component enters the gap between the roller pin and the roller wheel for lubricating, and the lubricating oil on the upper part of the tappet is injected to the roller wheel through two through holes of the tappet body, thus the lubricating and cooling effects are good. The tappet device disclosed by the invention can be widely applied to the fuel injection pump so as to improve the pressure lubricating function and carrying capacity of the fuel injection pump, and has broad application prospects.

Description

technical field [0001] The invention relates to a fuel injection pump tappet device, in particular to a fuel injection pump pressure lubrication integral barrel-shaped tappet device. Background technique [0002] The tappet part is the key element between the camshaft and the plunger in the fuel injection pump of a diesel engine. It changes the rotary motion of the cam into the reciprocating motion of the plunger. The tappet part of a conventional fuel injection pump includes a tappet body, a roller pin, a roller bushing, For parts such as rollers, the parts are generally designed as clearance fits and splash lubrication is adopted. There are deficiencies in this structural design and lubrication method. First, splash lubrication has a minimum linear speed requirement for moving parts. It is not easy to form a lubricating oil film when the diesel engine or fuel injection pump is operating at a low speed, and it makes the tappets, cams and other parts. The contact is often i...

AI Technical Summary

Problems solved by technology

There are deficiencies in this structural design and lubrication method. First, splash lubrication has a minimum linear speed requirement for moving parts. It is not easy to form a lubricating oil film when the diesel engine or fuel injection pump is operating at a low speed, and it makes the tappets, cams and other parts. The contact is often in a mixed lubrication state, and it is not easy to dissipate frictional heat at high speeds. Especially with the development of technology, the oil supply pressure of the fuel injection pump is getting higher and higher, and the load on the tappet is getting bigger and bigger. The requirements for lubrication and cooling As the tappet and cam structure of splash lubrication become higher and higher, the deficiencies have been highlighted; secondly, the guide length of the tappet body in the conventional fuel injection pump tappet is small. On the one hand, it is prone to deflection during movement, resulting in lateral pressure and The increased friction and the uneven thickness of the oil film lead to premature wear; on the other hand, the guide length of the tappet is small, and it is easy to deform. Reduce its stiffness and strength, resulting in low overall bearing capacity of the tappet

Generally speaking, conventional fuel injection pump tappet components are increasingly unsuitable for development requirements

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