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THE PERFORMANCE OF THE CAR
Under serviceability understand the technical co- standing vehicle, in which at this moment in time menny it meets all the requirements set only for the main parameters characterizing the nor- optimal performance of the specified functions. For example, if car headlights do not burn, it is considered to be the working- reliable, as they are able to perform their functions in day- ing time, however, the car is deemed is faulty. During operation of any machine of its working- the capacity is not constant and depends on the time work you. Explain that the schedule change performance in time Systematic and timely technical who maintenance and minor repairs in process operation orientation of the vehicle provide for a long time menny normal operation in accordance with pas- tailors modes. However, due to mechanical, chemical, electrical chemical and electrical effects is a loss health (phase 4 — 5) and restore it through maintenance and minor repairs becomes impossible, arises the necessity of stopping the machine at first overhaul (point 5). Correct and its vremennoe the definition of this point is very important because further operation after a time Т1и cause- no sudden catastrophic decline in health (5’). After the first overhaul cycle change the health is repeated, as shown the above graph (sections 5 — 6, 6 — 7, 7 — 8, 8 — 9). The number of overhauls is determined by the design car and sets of normative data. Performance cars are often reduced because of increased clearances, changes in the size of parts, quality and properties of the rubbing surfaces of the parts. Gradual changes in the size, shape and properties on surface layers of the workpiece material by friction is called wear, the result of the process of wear is wear, in the process of use are normal wear and emergency. Normal wear results in compliance with all the parameters of the mode of operation of the vehicle. On the time axis can be divided in three phases: I — the running-in period; II — the period of normal wear and tear; III — the period of emergency (catastrophic) wear. A sharp increase in the wear rate during running-in associated with smoothing the irregularities of the friction surface- hot surfaces after machining and education op- specific microrelief of the surface layer. On the second the period of operation after the formation of the microrelief on friction surface, the wear rate of parts stabilization efficacy, and this period characterizes normal operation units of the car. During prolonged operation of the vehicle the amount of the nose grows and after a certain time T becomes ava the series a critical value. Further operation of AB- tomobile should be terminated, as a result of AV- the series of wear dramatically increasing gaps in mate appear blows, knocks that cause failure individual parts and assemblies, and their subsequent repair Stano- becomes impossible. This character wears is almost fair for all types of physical deterioration. Under the physical wear see change shape, the size of the parts installed visually or by measurements when carrying out maintenance and repair. Another type of wear can be moral because the nose, which is determined by the backlog of equipment from level new advanced equipment and technology. Signs obsolescence are low efficiency, ek- sploitation and consumer properties of cars, the usual- but they should be replaced with new designs or brand if there is no possibility of their modernization. |
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