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This paper suggests a way to improve the strength of the driveshaft, which is a vulnerable part of the driveaxle system, for a 3.5-ton commercial vehicle. The driveshaft is composed of a universal joint with a spider andyoke, yoke shaft, etc. The driveshaft is developed by choosing design parameters for the spider and yoke suchas the diameter and distance through the structural analysis of the driveshaft’s components. Some driveshaftdesign cases have been made and analyzed with ANSYS; the strength of the driveshaft parts are validated fromthese results to propose an optimal design case. Finally, we suggest a driveshaft system that satisfies theworking conditions for a 3.5-ton commercial vehicle.
This paper presents a theoretical analysis to estimate the undeformed chip thickness required for cutting force simulation model development in ball-end milling. In machining, cutting force is estimated by multiplying cutting cross-section area to specific cutting forces. Specific cutting force, that is cutting parameter, is one of the important factors for cutting force prediction model and has different values according to workpiece materials. Cutting cross-section area is simply estimated in 2 dimensional cutting, but not simply estimated in 3 dimensional cutting due to complex cutting mechanics. In finishing cutting of free form surface using ball-end milling, cutting is almost performed in the ball part of the cutter and tool geometry such as tool radius, helix angle along length from tool tip are varied. As a result, cutting speed, effective helix angle and rake angle of the ball end mill are different according to length from tool tip. Study on undeformed chip thickness can be based other research, for example, cutting force prediction, tool deflection and dimensional error characteristics simulation. For undeformed chip thickness estimation, tool and chip geometry are analyzed and then the definition of chip thickness and estimation method are described. The results of analysis are compared with geometrical simulation and other method.
This paper presents the development of the transfer case for a 3.5-ton commercial vehicle. A transfer caseis composed of many parts, including helical gear, shaft, bearing, planetary gear, and others. Helical gears arecurrently used as power transmitting gears due to their relatively smooth and silent operation, large loadcarrying capacity, and operation at higher speeds. The key parameter in transfer case development is thebending stress at the root of a tooth in the helical gear. The bending stress of the helical gear has beenstudied through theoretical calculation and finite element method (FEM) analysis. Major factors of the bendingstress calculation are determined according to American Gear Manufacturers Association (AGMA) standards,and FEM model analysis of the helical gear is conducted. FEM results are compared with theoreticalcalculations and the difference of the bending stress is described.
This paper represents the structural design of the light weight axle beam for medium duty commercial vehicle using hot press. To reduce the weight of the axle, axle beam of solid type was replaced by hollow type which was made by hot press. According to the change of axle beam structure and manufacturing method, we have to investigate the structural strength and fatigue performance. To verify the axle beam performance, the structural analysis was carried out by simplified axle beam model and various design parameters that are axle beam height, thickness and width. From the analysis results, the light weight axle beam structure was founded and applied the full model analysis. This study will be used as a guidance in development of the light weight axle for medium duty commercial vehicle.
This paper discussed the development of the transfer case involving a 3.5-ton commercial vehicle. A transfer case is mainly used as a power distribution system between the transmission and the front/rear axle. In this paper, the main parts of the transfer case, such as power transfer shaft, helical gear, bearing, etc., were verified through CAE simulation and performance tests. A developed transfer case is not damaged, not even a crack and fracture, after the strength and durability tests. Finally, a transfer case meeting the requirements of a 3.5-ton front axle driven commercial vehicle was developed. The results of the development would be used as an alternate to the existing transfer case after the vehicle test.
In this paper, we studied the working data measuring and analysis technology for tractor development. To measured the tractor power and performance, firstly, we investigated the usage and working conditions of tractor duty mode, weight, working velocity and transmission steps and so on. Usage of tractor is acquired through the investigation of user and working conditions are acquired by the measuring data of the working load. Secondly, we made the measuring system using telemetry for torque, RPM, Pressure sensors and measured the data of 5 duty mode that was the drive, loader, trailer. rotary and mower. It was the engine output torque, RPM, pressure of transmission in each transmission steps and velocity. We decided the performance of tractor through the analysis of measured data and weight of duty mode load.
In this paper, we studied the reliability test specification development for agricultural tractor using mowing the lawn. To develop the reliability test specification, firstly, we investigated the usage and working conditions of tractor duty mode, weight, working velocity and transmission steps and so on. Usage of tractor is acquired through the investigation of user and working conditions are acquired by the measuring data of the working load. Secondly, we made the test specification of performance, durability using analysis of acquisition data. Developed test specifications were categorized the lab. test and field test, performance and durability. We tested the agricultural tractor performance, durability using developed 62 type test code. We described the test specification development process and test results.