Abstract
Torsional oscillations generally occur in the drive to a fuel injection pump and, depending on the drive arrangement and the conditions of operation, the maximum dynamic torque in the drive can be considerably in excess of the pumping torque. It is necessary to allow for this effect in the design of the engine, drive, and pump components.
In this paper the methods of measuring the dynamic torque in the drive shaft and the instantaneous acceleration of the rotor of a distributor pump are described. Results of tests on two typical drive arrrangements, both on an engine and on a test machine, are then shown. A theoretical study is made of the drive system with backlash, and the results are compared with experimental values.
It is shown that backlash in the drive can lead to high instantaneous torques and large torque reversals. A design of drive which eliminates backlash is described, and tests carried out on it confirm that the expected improvement is obtained.
Get full access to this article
View all access options for this article.