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Separated longitudinal drive-train for wheel-loaders: A concept study
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis work is done in cooperation with Volvo Construction Equipment, a business area within the Volvo Group, which is one of the world’s leading manufacturers of construction equipment such as wheel-loaders, excavators, articulated haulers, road development equipment and compact equipment. Concurrently with increasing fuel costs and environmental demands, such as CO2 emissions, ever increasing demands are placed on the producers to manufacture fuel efficient construction equipment. In order to maintain a leading market position Volvo Construction Equipment continuously need to improve the design of future generation construction equipment including fuel efficient high performing drive-train components. The traction, performance and efficiency of all-wheel drive vehicles are strongly influenced by the way the differentials operate. In a wheel loader there are currently no differential between the front and rear axle but a rigid connection. This results in a wind-up torque build-up in the drive-train which contributes to losses and adds additional stress to the components. The aim of this thesis is to investigate the feasibility and propose a mechanical design for separating the longitudinal drive-train for a large wheel-loader. The solution is to be optimized based on demands such as size, cost, performance, efficiency and controllability. To reach the aims a pre-study was performed where the current drive-train design was studied as well as the competitors and related technology. The pre-study showed that few competitors have solutions for this problem, and those that does, have a very basic design and function. Problems with the current design were investigated together with possible problems and gains from a future design change. This showed that a fuel efficiency gain can not be secured with the data available and that a separation of the drive-train can not decrease the most critical stresses in the drive-train without causing a negative impact on the vehicles retardation ability, using the brake setup of today. The work also resulted in a number of concepts for mechanical designs of a separated longitudinal drive-train as well as a concept evaluation performed together with engineers at Volvo CE. For the selected concept, a planetary differential with a wet-clutch differential lock, reasonableness calculations and drawings was also produced. Furthermore, the thesis shows that it is possible to fit such a solution in the current transmission housing without any drastic changes.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51424ISRN: LTU-EX--10/023--SELocal ID: 8a020046-87b3-4f52-8a27-985af958f005OAI: diva2:1024785
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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