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Please use this identifier to cite or link to this item: http://hdl.handle.net/11178/4440

Title: カムとローラ・タペットのトライボ特性に関する実験的研究 : 第7報 : カム面仕上げ粗さの影響(機械工学科,工学部創設40周年記念号)
Other Titles: Experimental Study on Tribological Characteristics of Cam and Roller Tappet : 7th Report : Influence of Cam Surface Finish Roughness(DEPARTMENT OF MECHANICAL ENGINEERING)
Authors: 副島, 光洋
江島, 良人
長藤, 将史
Soeijima, Mitsuhiro
Ejima, Yoshito
Nagafuji, Masashi
ソエジマ, ミツヒロ
エジマ, ヨシト
ナガフジ, マサシ
九州産業大学機械工学科 / 九州産業大学機械工学科 / 九州産業大学大学院工学研究科機械工学専攻
Keywords: Tribology
Friction
Engine Valve Train
Cam Lobe
Shot Peening Surface Finish
Surface Roughness
Roller Tappet
Oil Film Thickness
Pressure Distribution
Solid Contact
Elastohydrodynamic Lubrication
Mixed Lubrication
Issue Date: 20-Dec-2004
Publisher: 九州産業大学工学部
Abstract: The friction characteristics of the cam and roller tappet were studied for the design of engine valve train elements. The influence of the cam surface finish roughness on the friction was examined by measuring the contact load and the friction force between cam and roller tappet with the test rig. The sintered cam lobes are finished by grinding or blasted by the shot peening finish. The traction effect between rough faces under the rolling contact was considered as a reason why the friction characteristics change. The change of the bearing rate of solid contact between cam and roller with the surface roughness was predicted under the elastohydrodynamic and mixed lubrication theory. Some study results are summarized as follows, (1) The influence of the cam surface finish and roughness on the contact bad and friction diagrams is quite small, but the tappet clearance should be adequate to the deviation of cam profile. (2) The influence of the oil temperature or the cam surface finish and roughness on the mean friction torque and the mean drive torque is also small. (3) Under the high rotational speed of camshaft, however, the mean friction coefficient decreases as the surface roughness becomes large. (4) The rough surface of cam lobe prevents the occurrence of skidding under the rolling contact between cam and roller because the bearing rate of solid contact increases as the surface roughness becomes large. (5) The surface roughness should be larger than one micron and smaller than two microns in center line average values. (6) Therefore the shot peening finish is more desirable than the grinding finish for the cam of the roller follower valve train.
URI: http://hdl.handle.net/11178/4440
Appears in Collections:第41号

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