2.6.3. Operational demands for construction of assembly units.


Already at the stage of elaboration of designing documents correct designing presupposes prediction of behavior of a machine in operational conditions, preparation of the required maintenance and repair procedures. Correspondingly, construction of AU too, must be such, as to provide carrying out of these procedures in the most favorable conditions.

There are definite rules of account of maintenance and repair of AU during designing.

Firstly, convincing enough basis of the adopted designing, decision from the point of view of performing maintenance and repair is required. For example, installation of bearings with disposable lubrication makes use only when season operating times are combined with durability of work of such bearing (for example, grain harvester combines). If lubrication of bearing during preventive maintenance is advantageous takings are secured to be mounted, as disassembly of packing rings of bearings with disposable lubrication will damage them.

Secondly, on the basis of available information about analogues it is necessary it carry out estimation of the future failures of designed AU and to foresee disassembly of damaged details.

fig 2.20 Thirdly, in construction of AU it is necessary to foresee convenience of access of tool for clamping details, safety of attendants during disassembly. As an example fig.2.20. demonstrates flange bearing.

Disassembly of it is possible only with the help of hammered chisel, which most likely will lead to damage of its body. If a designer had foreseen recesses on the body for its clamping by a puller, damages would have been excluded.

In the forth turn, in a construction fastening points for means of mechanization during disassembly, loading, and devices for attaching of measuring equipment are to be provided.

The above recommendations for designing assembly units may contradict eac. other. Satisfactory decision is usually obtained on the way of reasonable compromise. Thus, it may be said, that a designer, designing AU must always take a probable assembly diagram in account, as it influences the machine indices; and this conclusion we can make from the facts, described above.

Give Russian equivalents for the following words and memorize them:


The stage of elaboration, prediction, required, maintenance, repair procedures, provide, carrying out, firstly, designing decisions, frc.n the point of view, installation, bearings, disposable lubrication, combined, durability, grain harvester combines, lubrication of bearings, preventive maintenance, advantageous, secured, Backing rings, analogues, it is necessary, estimation, future failures, to foresee, convenience of access, clamping, attendants, flange necring, hammeV «nd chisel, most likely, lead to, recesses, pulled, excluded, in she forth tuin, Measuring equipment, contradict, decision: is obtained, reasonable compromise, take in account, influences, conclusion.

Find English equivalents for the following words:


Документации, прогнозирование, мероприятие, техническое обслуживание, ремонт, смазка, предупредительный ремонт, демонтаж, уплотняющие кольца, аналог, фланец, повреждение, выемка, предусматривать, погрузка, проектирование, показатель.

Subjects for discussion and questions to the text:

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