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Gas distribution mechanism
Gas distribution mechanism is used to promp- Menno intake into the combustion chamber a combustible mixture (carbura- Torno and gas mixing engines) or air (diesel nye engines) and release them from exhaust gases. Naturally mechanisms are distinguished by RAS the position of the valves in the engine. They can be with top- him (in the cylinder head) and bottom (cylinder block) the position of the valves. The most common gas distribution mechanism from the top. - eat valves, which facilitates access to the valves for their about- 28 , therefore, allows to obtain compact camera shore- tion and to provide better filling its Molotov cocktails or by air. Gas-distributing mechanism (Fig. 8) consists of: • camshaft; • drive mechanism of a camshaft; • valve mechanism. Work timing consider on the example of the engine with a V-shaped arrangement of the cylinder- firewood. The camshaft is in the "collapse" of the block motion gates, i.e. between its right and left rows of cylinder- moat, and is driven in rotation from a crankshaft through block timing gear. When a chain or belt- Fig. 8. Gas distribution mechanism of V-type engine with overhead valves rated drive rotation of the camshaft implementation is the chain or gear re- temporary transfer (Fig. 9). When rotating the camshaft, the Cam of the RAID et on the plunger and raises it together with the rod. Top- deposits rod end presses on the adjusting screw, mounted in the inner arm of rocker. Koronis- lo, turning on its axis, an outer shoulder less than an hour. - took it to the valve stem and opens the inlet hole or the exhaust valve in the cylinder head strictly in rela- according to the valve timing and modalities of work cylinders. Under valve timing understand the points at- beginning of opening and end closing flaps, which are expressed are expressed in degrees of crank angle on relatively dead spots. Valve timing picking- Ute empirically depending on the number of revolutions DWI gates and design of inlet and outlet nozzles. The manufacturers indicate the timing for their engines in the form of tables or charts. Correctness of installation of naturally fur- the human body is determined using the alignment markers, which are dis- rely on the distribution gears or drive-by Mr. pulley of the engine block. Deviation during installation of the phase leads to the exit damage to the valves or engine in General. The constancy of phase ha trampeline is saved only by compliance with the reg- laminirovannogo heat clearance in the valve mechanism the model of the engine. The violation magnitude of this gap- RA leads to accelerated valve wear and loss of engine power. The same sequence of alternation of cycles in the various cylinders is called the order of the cylinder- firewood engine, which depends on the location of the cylinder- the ditch and the design of crankshafts and Cam- inflammatory shaft. The four-cylinder single-row engine bars to be rotated 180° and the firing order can In the V-shaped eight-cylinder four-stroke DWI gateleg crankpins of a crankshaft are at an angle of 90° and when the angle of camber of the engine 90° agnomen- these bars will overlap in the left number of cylinders on with respect to the right row 90° or 1/4 turn of kolena- in the shaft (see Annex). These engines are as follows schy firing order: 1-5-4-2-6-3— 7-8 |
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