Research Papers

Design Optimization of Complex Hydromechanical Transmissions

[+] Author and Article Information
Karl Pettersson

e-mail: karl.pettersson@liu.se

Petter Krus

e-mail: petter.krus@liu.se
Department of Management and Engineering,
Division of Fluid and Mechatronic Systems,
Linköping University,
Linköping 58183, Sweden

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the Journal of Mechanical Design. Manuscript received December 12, 2012; final manuscript received April 25, 2013; published online July 2, 2013. Assoc. Editor: Avinash Singh.

J. Mech. Des 135(9), 091005 (Jul 02, 2013) (9 pages) Paper No: MD-12-1605; doi: 10.1115/1.4024732 History: Received December 12, 2012; Revised April 25, 2013

Demands for higher fuel efficiency for off-highway applications motivate manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Increased intelligence and more advanced architectures are, however, more difficult to design and prototype. This leads to longer product development processes and a greater need for early product evaluation. The great variety of existing concepts also requires a methodology to support the choice of architecture. This paper proposes a design methodology for complex hydromechanical transmissions based on optimization. The main objective is to maximize energy efficiency and adapt the design to suit the typical operating behavior of the application. The methodology is also implemented on a multiple mode transmission concept sui for a heavy wheel loader application. It is shown that the design of the gearbox heavily influences the energy consumption and the necessity to use optimization when designing the gearbox.

Copyright © 2013 by ASME
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Fig. 1

The proposed design methodology

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Fig. 2

Simulation-based design optimization according to Krus and Andersson [12]

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Fig. 3

Efficiency maps for a displacement machine of in-line design at full displacement

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Fig. 5

Efficiency of the spur gear

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Fig. 7

The Jarchow concept with an arbitrary number of modes m (in the figure, m is an odd number). The figure only shows the principle of the concept and the dotted lines represent a connection between two gears.

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Fig. 8

The tractive force requirements of the wheel loader with the dashed line as the tractive power

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Fig. 9

Bubble plots of the typical operating cycles

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Fig. 10

Optimizations for transmissions with m = 2, 3, 4, 5, and 6

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Fig. 11

The functional spaces and the conventional design points corresponding to m = 3, 4, 5, and 6

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Fig. 12

The vehicle speed as a function of the speed ratio of the hydrostatic transmission for m = 4

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Fig. 13

Simulated efficiency of the transmission for m = 4

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Fig. 14

The optimized values for the design parameters

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Fig. 15

The consumed energy in the optimized designs




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