Study of Rocker Toe Wear in Medium Speed Diesel Engines Kirloskar Oil Engines, Limited

Format:

Conference/Event

Author/Creator:

Basu, Basu, author.

Contributor:

Aghav, Yogesh

Gokhale, Nitin

Kanase, Kedar

Kumar, M N.

Conference Name:

Symposium on International Automotive Technology 2015 (2015-01-21 : Pune, India)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2015

Summary:

Valve trains are highly burdened powertrain subsystem which has to undergo high fatigue cycles during its service lifespan. Wear enhances valve lash thus depreciating the performance drastically. Analytical advances have helped engineers to predict parameters such as wear, contact stresses, lubrication et cetera to uphold the durability of valve train components. Most of the genset and industrial engines running at medium speed use type 5 valve train. In this paper, our study involves about crack induced "wear" due to Hertzian stress on rocker toe and the process followed to resolve the problem for a medium speed diesel engineWe experienced the problem of rocker toe crack resulting in toe wear in field and on test bed. Our investigations led us to evaluate the life of a rocker toe by specifically developing a test cycle to reproduce the wear due to induced cracks as well as to assess the durability. A procedure is developed to characterize the rocker toe wear including dimensional, geometrical, profile measurements along with metallurgical assessment. Thus, the wear characteristics were studied in detail from toe profile and materials viewpoint. A root cause diagram is made to arrive at various affecting parameters in rocker toe wear.Based on the above, a one dimensional kinematic simulation model is used to improve the cam profile design and to study the sensitivity of rocker forces on valve tip with respect to engine speed. A novel approach of two layer modeling of Hertzian stress is carried out in FEA. The relationship between simulated and experimental results is established

Notes:

Vendor supplied data

Publisher Number:

2015-26-0189

Access Restriction:

Restricted for use by site license