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Rocker arm shaft with improved abrasion resistance and rocker arm shaft/bush assembly comprising same

A technology of rocker sleeve and rocker shaft, which is applied in the field of rocker shafts, can solve the problems of rising unit price of manufacturing and achieve the effects of maximizing effect, maximizing wear reduction and reducing wear

Inactive Publication Date: 2013-07-24
DOOSAN INFRACORE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned improvement of materials and raw materials has led to an increase in the manufacturing unit price. In particular, recently, as the engine operating environment has changed in a direction that further causes wear of the rocker shaft and rocker sleeve, only the improvement of materials or raw materials to reduce the limit of wear

Method used

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  • Rocker arm shaft with improved abrasion resistance and rocker arm shaft/bush assembly comprising same
  • Rocker arm shaft with improved abrasion resistance and rocker arm shaft/bush assembly comprising same
  • Rocker arm shaft with improved abrasion resistance and rocker arm shaft/bush assembly comprising same

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Embodiment Construction

[0050]The present invention will be described in more detail below with reference to the accompanying drawings.

[0051] The present invention relates to the technology of reducing friction and wear by processing fine unevenness on at least one of two surfaces that are relatively moving through the medium of lubricant.

[0052] According to the theory of fluid lubrication, if two surfaces are parallel, even if the two surfaces move relative to each other through a liquid lubricant, no hydrodynamic pressure will be generated in the lubricant. Although there are exceptions, hydrodynamic pressure is generally generated when there is a wedging effect where the oil film thickness decreases in the sliding direction. Taking dynamic pressure thrust bearings and radial bearings as examples, thrust bearings generate the wedge effect through assembly errors, and radial bearings generate the wedge effect through eccentricity.

[0053] However, mechanical workpieces generally have fine cu...

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PUM

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Abstract

The present invention relates to a rocker arm shaft and a rocker arm shaft / bush assembly including a rocker arm shaft, and a rocker arm bush which encloses the rocker arm shaft, in which the rocker arm shaft has a surface on which minutely processed concave-convex portions are formed, thereby achieving excellent lubricative characteristics and as a result having excellent abrasion resistance.

Description

technical field [0001] The present invention relates to a rocker arm shaft in which fine unevenness is processed on the surface in order to improve wear resistance. The present invention also relates to a rocker shaft sleeve assembly comprising a rocker shaft processed into fine unevenness and a rocker sleeve surrounding the rocker shaft. Background technique [0002] Generally speaking, the engine repeats the following operation process. That is, the camshaft is rotated by the rotational force of the crankshaft, and the intake and exhaust valves are reciprocated up and down at regular time intervals by the cams formed on the camshaft. Inject the mixture of fuel gas and air into the combustion chamber and compress it to make it explode, so as to use its explosion pressure to obtain power. [0003] As mentioned above, a unit including a series of elements such as camshafts, cams, cam followers (such as tappets), push rods, rocker arms, valve springs, valves, etc. for operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/18F01L1/12
CPCF16H25/14F01L1/181F16C2240/42F16C33/02F01L2810/02F01M9/10F16C2360/18Y10T74/2107F01L1/18F01L3/24
Inventor 金圣基吴石柱
Owner DOOSAN INFRACORE CO LTD