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Technique Technique | Auto Adjust the valve timing on the engines of VAZ
Technique Technique | Auto Adjust the valve timing on the engines of VAZ
| Adjust the valve timing on the engines of VAZ |
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| Written by Âëàäèñëàâ Ñèíèöà | |||
| Ñðåäà, 28 Ìàé 2008 | |||
Transferred via translate.google.com The text of the original in Russian moiidei.com Phase shifting is realized more easily, but less effective in increasing power, as well as the demands of two distribution shafts - turning the shaft that controls the inlet valves, and actually carried out the reduction or increase in overlap of valves at different engine speeds. However, the positive power of the additive increases the overlapping of the valves at high engine speeds is partially offset by negative factors - the decline dozaryadki fuel-air mixture (FA) by reducing the valve angle closure after passage NRMM. Adjusting FGR scaling charts the rise of mass production cam sold by Honda in the form of alternately operating cams with different scan: at low revs - with a "narrow" phase, at high (about 5000 rpm) - the "broad". Switching takes place under control of the oil pressure by means of hydraulic cylinders. Thus, not only vary FGR, but also lift cam. The complexity of manufacturing, configuration and operation of such devices have not given them a wide distribution, although they allow the unit to raise up to 100 liter capacity l.s./dm3 without a supercharger. Emerging vazovskimi professionals design, copy hondovskuyu, imperfect mass-kinematic parameters with complex technological point of view and require the transition to a new head unit that casts doubt on the idea embodied in stone. On the basis of a patent of RF ¹ 2133348 CD devices designed to adjust the phase (URF), fully aligned with gidrooporami 21214-1007160 and does not require any other modifications to the engine, except for installation raspredvala with wide FGR. In the face conveyor assembly so would entail only the re-grinding machine for raspredvalov. For the secondary market require replacement of standard raspredvala to the hull, thus (twice), affects the cost of upgrading Adjusting the phase of data devices, as opposed to a "step" hondovskih carried out smoothly throughout the range of rotation of crank the engine, which provided optimal FGR for all modes of engine operation. The change comes at the expense of FGR give rod device (gidroopory): at low speeds utopanie rod is 2 ... 3 mm, at high (about 4000 rpm) rod is tough, as usual gidroopory, ie utopanie zero. Accordingly (based on the ratio of the rockers that are separated by a line of contact with the cams), and almost linearly from the engine speed is changing height and angles of the beginning and end of the open state of the valve (see Figure 1).  The adjustment range - up to 60 gr. on each side of scan angle of rotation crank the engine! This and the outlet valve as well. As a result of valve overlap the range of 120 g! Thus, the parameters of the filling of cylinders FA dvuhklapannyh engine approaching and even surpass analogues chetyrehklapannyh! Increasing power and torque (see Figure 3)  especially in the range of high speed without deteriorating economy and a greener engine. The only drawback of this scheme of regulation of FGR is the noise at low speed of rotation of the engine crankshaft from a high speed landing on the valve seat plate (see Fig. 2).  But the rest of kinematic chain (end of the valve-rocker-cam-rod gidroopory) works in bezzazornom condition, so the resource data detail should not be changed, and redundant noise is present only at low speeds and the amount does not exceed the allowable limit. Similar shortcomings have a normal gidroopor that equalizes their position. Availability muted knocking valves can reduce the separation-driven valves (ie, final - ordinary gidrooporami), additional sound insulation, but it also prevents and re-attempt to start the engine, warn pedestrians of approaching vehicles, will help to remove carbon from valves and plates of bedding surfaces and saddle valve, ie, the use of technology paired with a saddle valve plates without bedding, and the microrelief, which obminaetsya in the process of operating the engine on the plane of tangency
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