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Friction characteristics and heat flow in wet inching clutch for motor grader transmissions
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The friction characteristics and the heat transportation in a wet clutch were investigated for Volvo CE at the division of Machine elements at Luleå University of Technology. High temperature rises in the clutch is known to affect the friction characteristics and decrease long term durability of the oil and friction material. Therefore it is important to know the temperature characteristics of the material and oil when designing a drivetrain with an advanced control system. In this thesis the heat absorption ability for two different oils was compared. The temperature and friction characteristics for two paper-based friction materials were evaluated. Two groove patterns with two different manufacturing methods, cut and pressed, were studied to observe which pattern/method that emit heat the best. This was done by using a wet clutch test rig. To be able to measure the temperature rise on the friction surface an infrared pyrometer was used. Matlab was used to process the result. Presented results show that: • Pressed grooves emit heat better than cut grooves. • Pressed and cut grooves have the same friction characteristic. • Material 2 emit heat better than material 1. • Material 2 has a higher dynamic coefficient of friction than material 1, and a lower static friction • Material 2 would generate a smoother gear shift for this application. • The two oils tested shows similar heat absorption characteristics. • Oil 2 has lower coefficient of friction than oil 1.

Place, publisher, year, edition, pages
Keyword [en]
Technology, wet clutch, inching, friction characteristics, temperature, characteristics, paper-based friction materials
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42998ISRN: LTU-EX--04/318--SELocal ID: 0ed65c42-3d88-4cff-9a28-746bf90d44acOAI: diva2:1016225
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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