Tractor transmissions

Renius, Karl Theodor

doi:10.1007/978-3-030-32804-7_5

Cited by 7 publications

(13 citation statements)

References 18 publications

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“…For the accumulator optimization, an average speed of 50 km/h was considered and an α coefficient of 0.5. According to equation (2), by setting a maximum pressure of 450 bar, an accumulator volume of 39 liters and a pre-charge pressure of 140 bar were obtained. Subsequently, the DOE technique was applied to the transmission identified in the previous step.…”

Section: Procedures Sub-opt and Sub-opt-doementioning

confidence: 99%

“…The constant of proportionality was found to be approximately equal to 1000 cm 3 /cm 3 . The accumulator's volume is calculated directly from equation (2).…”

Section: Objective Functionsmentioning

confidence: 99%

“…The transmission can be the traditional one, or a hydrostatic transmission or a hydromechanical transmission (figure 1c). The latter can have simple configurations, such as the well-known Input Coupled (IC) and Output Coupled (OC), or complex configurations [2]. The hybrid hydromechanical transmission was patented by Ivantysinova in 2008 [3] and studied in the same years by Van de Ven [4], Kumar [5], and Kumar and Ivantysynova [6,7], who proposed a sizing method, focusing on the problem of transmission management.…”

Section: Introductionmentioning

confidence: 99%

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Design procedures for hybrid hydromechanical transmissions

Andretta

Rossetti

Macor

2022

J. Phys.: Conf. Ser.

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Hybrid hydromechanical transmissions are particularly suitable for heavy vehicle and have the potential to provide better efficiencies than other hybrid architectures. However, their study must be carried out with care, since there are many possible transmission configurations and there is not one superior to the others for all applications. The particular complexity of these transmissions requires that design be treated as an optimization problem. In this paper, the optimization procedures of the “non-optimal” type are compared with the “optimal” ones, which are more precise than the former, but much heavier in terms of calculation time. The former consist of two sections. The first one is dedicated to the simultaneous optimization of the layout and components of the non-hybrid hydromechanical transmission; the second one is dedicated to the accumulator only, which can be optimized by means of simple physical laws or by means of a “Design of Experiments “procedure. The “optimal” procedures, on the other hand, proceed with the sizing of the entire hybrid transmission through a mathematical programming problem that can be single or multi-objective. It will be demonstrated that the DOE “non-optimal” procedure provides results very close to those derived from the “optimal” procedures, with considerable savings in calculation times.

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Section: Procedures Sub-opt and Sub-opt-doementioning

confidence: 99%

“…The constant of proportionality was found to be approximately equal to 1000 cm 3 /cm 3 . The accumulator's volume is calculated directly from equation (2).…”

Section: Objective Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design procedures for hybrid hydromechanical transmissions

Andretta

Rossetti

Macor

2022

J. Phys.: Conf. Ser.

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“…The performance of a hydromechanical transmission is strongly conditioned by its layout, which can have a simple or complex forms. The former are the well-known Input Coupled (IC) and Output Coupled (OC), having a single planetary gear; the latter have more planetaries and additional mechanical ranges [4,5]. The hydromechanical transmission have been the subject of many research studies aimed at the performance analysis [6 -8], the design [9 -14] and the optimization of the components [15].…”

Section: Introductionmentioning

confidence: 99%

Design considerations about the hydromechanical transmission IC2OC

Rossetti,

Andretta,

Macor

2023

J. Phys.: Conf. Ser.

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The hydromechanical transmission IC2OC operates as an Input Coupled transmission at low speeds and as an Output Coupled transmission at high speeds; a series of clutches allows the shift between two layouts. In this way the transmission speed range can be almost doubled. The design of this transmission requires the full mechanical speed value for both basic layouts. Since these values heavily influence transmission performance, their choice must be made carefully. In this paper two choice criteria for these two speeds are proposed and discussed: the first one refers to the optimal choice for each basic layout; the second sets these speeds in correspondence with the speed of the maximum energy processed in a working cycle. The effectiveness of these two criteria, applied to an off-road vehicle transmission, demonstrates that the former guarantees greater efficiency than the latter, despite its good assumptions.

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“…The HMT can be viewed as a transmission system composed of a hydrostatic transmission and a mechanical transmission in parallel. Its efficiency can usually reach 80-90% [22], which is between the efficiencies of the above two transmission systems. The efficiency of the HMT is related to the parameters of transmission and the configuration of the machine.…”

Section: Introductionmentioning

confidence: 99%

Energy and Fuel Consumption of a New Concept of Hydro-Mechanical Tractor Transmission

et al. 2023

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Tractors equipped with hydro-mechanical transmissions (HMTs) typically deliver excellent fuel-saving performance but are expensive. To improve the fuel economy of cheaper tractors, the authors of this study have designed an HMT for a tractor that uses a simple, single planetary gear to merge the power and analyze its consumption of energy and fuel. First, we introduce the principle of transmission of the HMT and formulate a model to calculate its speed, torque, and efficiency. Second, we analyze the parasitic power of the HMT and simulate its characteristics of efficiency. Finally, we compare the efficiency of transmission and fuel consumption of HMTs with a single planetary gear and Simpson planetary gears. The results showed that parasitic power was obtained when the displacement of the variable pump was negative and the maximum ratio of hydrostatic power in each range was 45–46%. The highest efficiency of the proposed HMT in ranges RL (low range) and RH (high range) were 87% and 89%, respectively. It has a simpler structure than the HMT with Simpson planetary gears and consumes lower amounts of energy and fuel. These attributes make it suitable for use as a transmission system for large- and medium-power tractors with a continuously variable transmission.

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Tractor transmissions

Cited by 7 publications

References 18 publications

Design procedures for hybrid hydromechanical transmissions

Design procedures for hybrid hydromechanical transmissions

Design considerations about the hydromechanical transmission IC2OC

Energy and Fuel Consumption of a New Concept of Hydro-Mechanical Tractor Transmission

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