Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (4.3) (2018) 135-139 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Driven Camshaft Power Mechanism of the Vehicle Diesel Engine Fuel Pump Mykola Мoroz 1 *, Serhii Korol 1 , Serhii Chernenko 1 , Yurii Boiko 1 , Oleksii Vasylkovskyi 2 1 Kremenchuk Mykhailo Ostohradskyi National University 2 Central Ukrainian National Technical University *Corresponding author E-mail: mykolai.moroz@gmail.com Abstract The article deals with the actual problem associated with poor-quality operation of vehicle engines with incomplete loading and operation at partial high-speed modes. It is shown that such engine operating modes make up the bulk of the time, especially when the vehicle operates in urban conditions. Poor engine performance in these modes results in decline in fuel economy and environmental performance. To improve the technical performance of diesel engines, a device is proposed that allows control the uneven rotation of camshaft of vehicle diesel fuel pump. The kinematic schemes of the angular velocity transducers for fuel pump camshaft power mechanism, the kinematic and power drive calculation method are developed. Keywords: Camshaft, Diesel Engine, Fuel Pump, Kinematic Diagram, Partial Modes of Diesel Engine Operation. 1. Introduction Modern automobile engines have a low workload while operating, especially in urban conditions. Small loads and idling modes [1] make up more than 50%. At the same time, fuel costs increase and environmental indicators deteriorate. The problem of increasing operational economic and environmental indicators is relevant. The researches of passenger traffic flow carried out in works [2,3,4] confirm incomplete loading of the vehicle engine in a city mode operation. The operational fuel economy of a vehicle diesel engine is determined by the economy of the partial load modes conducted by the researches in [5,6,7]. In work [8] the basic principles of organization of driven uneven rotation of vehicle four-cycle internal combustion engine camshaft are described. According to this method, it is also possible to organize driven uneven rotation of the camshaft of high pressure fuel pump, which allows improve the fuel injection characteristics at partial high-speed [9,10,11,12] diesel engine operation. This can be achieved by stabilizing the linear speed of fuel pump plungers regardless of crankshaft rotational rate of the vehicle diesel engine. In the power transmission connecting the diesel engine crankshaft to the pump camshaft, it is consistently proposed to install two identical angular velocity transducers, which can be made in the form of Hooke’s joints in this device. The advantages of this choice of transducers include the fact that, firstly, these joints refer to the traditional and well-studied elements of mechanical transmissions produced in series. Secondly, one turnover of Hooke's main shaft has not one (as for most other types of transducers), but two periods of the output shaft angular velocity, which facilitates the use of these transducers to drive camshafts with a large number of cams. Thirdly, as it turned out as a result of the kinematic analysis of the new drive, the law of angular velocity variation provided by Hooke's joint proved to be very successful for calculating the mechanism using two consecutively operating angular velocity transducers. And, finally, fourthly, when using these joints, the drive remains kinematically closed and provides the calculated law of camshaft angular velocity variation with the alternating nature of the transmitted torque. However, this solution is applicable only to diesel engines with a uniform alternation of fuel flares in the cylinders. Besides, it has, as it was demonstrated by its detailed design, a significant drawback: the longitudinal dimension (length) of the new assembly exceeds the length of the automatic injection advancing clutch, in the place of which it should be installed, from 2.5 to 3 times. Therefore, the proposed device can be used only in those cases when the engine does not have a rigid restriction in the place of fuel pump installation. In particular, such a drive can be successfully used in the development of a motor bench with fuel variable injection rate. The bench equipped with these transducers and a device for manual adjustment of the degree of pump shaft rotation unevenness will make it possible to obtain experimental data on the dependence of the working process parameters on the fuel injection intensity for each characteristic engine operation mode, which in turn will improve the design of its fuel equipment. The mentioned above increase in drive size is due to the fact that Hooke's joint refers not to flat, but to spatial mechanisms. Therefore, in this paper, it is proposed to use a kinematic analogue of Hooke's joint as a transducer, which belongs to the class of plane cam-and-lever mechanisms. 2. Related Work In order to control uneven rotation of fuel pump camshaft on diesel engine partial operating conditions, it is proposed to use a cam-and-lever transducer of shaft rotation angular speeds in this work. The principal kinematic diagram of cam-and-lever mechanism is shown in Fig. 1.