9.1. 5-staged manual box of gear shifting (MBGS)Due to the energy emitted at combustion in cylinders of air-fuel mix a bent shaft of the engine develops torque, at the same time the frequency of its rotation lies within rather narrow range. The majority of modern engines of an OHV design develop the maximum torque at turns about 2500 a minute. At increase in frequency of rotation of the engine up to 4500 rpm the size of its torque decreases that further increase in power is not possible any more. Engines with the top arrangement of the camshaft (OHC) are capable to develop considerably bigger torque, however in much narrower range of frequencies of rotation.
Use in the transmission line of such component as the transmission allows to regulate relationship between turns of the engine and speed of rotation of driving wheels of the car, providing rather high return of the power unit practically in any service conditions of the car.
Smoothness of torque transmission from a bent shaft to a main shaft of the manual box of gear shifting (MBGS) is provided by coupling assembly which design and the principle of action are sorted in the Head Podvesk and steering of the present manual. Consecutive gear shifting in the course of change of speed of the movement of the car is provided due to use in the transmission of a multistage reducer. The transfer relations of each of five steps of RKPP provide maximum efficiency of transfer to the power developed by the engine to driving wheels of the vehicle. Not front-wheel models of a gear wheel of a main shaft of the transmission transfer the torque developed by the engine to gear wheels of a secondary shaft which usually settles down slightly below and away from primary. Gear wheels of both shaft of all steps of forward transfers of RKPP are in continuous gearing, however continue to be turned freely on bearings before operation of coupling and the corresponding synchronizers. When switching from one transfer to another in the course of the movement there is a consecutive release of one gear wheels and blocking on a shaft of others. Blocking and an otpuskaniye of gear wheels is carried out due to operation of the couplings rotating between them and shaft and equipped with stoppers. In modern transmissions synchronization of steps of switching of all forward transfers is provided. Frictional elements of synchronizers provide smoothness of introduction of the corresponding gear wheels to gearing with shaft with preliminary alignment of turns of gear lock couplings.
In view of complexity of a design of RKPP, absence on free sale of necessary replaceable internal components and need of use of the special equipment, authors of the present manual do not recommend to owners of cars to carry out capital repairs of the transmission independently. Repair of a box in the conditions of a workshop of car service is rather expensive operation, in a type of what, it is necessary to consider alternative options of replacement of the failed block new or restored. Any useful information on repair and replacement of transmission can be received at car repair shops of the Mitsubishi company. Regardless of the chosen way of elimination of problems (repair or replacement), independent dismantle of a box from the car will allow to reduce material inputs significantly.
In view of told in this Part of Chapter only the description of process of implementation of such, lying within qualification of the average amateur mechanic procedures as the general adjustment of the drive of gear shifting and removal/installation of assembly of RKPP is offered to attention of the reader.