2.1.2.3. Main characteristics of operation of the mechanism of change of phases of a gazoraspredeleniye

The executive mechanism of change of phases of a gazoraspredeleniye has two hydraulic compartments: cut advancings of the moment of opening or closing of the valve and cut delays of opening or valve closing. Compartments settle down between the integrated case of an asterisk of a camshaft and a cam-shaft rotor. The oil pump submits engine oil to each compartment. Hydraulic pressure in each compartment is supervised by the oil operating valve (OCV), and relative phases of an asterisk of a camshaft and a cam-shaft change for receiving the optimum moment of opening or closing of valves according to operating conditions of the engine.

When the pin in the executive mechanism of change of phases of a gazoraspredeleniye rests against a rotor which under the influence of a spring is in the provision of the maximum delay of opening or closing of valves, the asterisk of a camshaft and a cam-shaft rotate as a uniform detail. When pressure of oil raises, and the pin departs from a rotor, becomes possible to modify the mutual angular provision of an asterisk of a camshaft and a cam-shaft.

Fig. 2.33. The scheme of circulation of oil during an advancing of opening or closing of valves: 1–PCM block; 2–the oil operating valve (OCV); 3–zolotnikovy valve; 4–oil pump; 5–cam-shaft; 6–executive mechanism of change of phases of a gazoraspredeleniye; 7–rotor; 8–case; 9–oil pallet; 10-to a compartment of an advancing of opening or closing of valves; 11-cut advancings of opening or closing of valves; 12-from a compartment of delay of opening or closing of valves

When the zolotnikovy valve in the oil operating valve (OCV) moves on the left according to a PCM block signal, oil under pressure gets to the canal of an advancing of opening or closing of valves and in a compartment of an advancing of opening or closing of valves in the executive mechanism of change of phases of a gazoraspredeleniye. Then the rotor incorporated with a cam-shaft rotates in the direction of an advancing of opening or closing of valves, against the case which is put in action from a cranked shaft, and the moment of opening or closing of valves moves towards an advancing (fig. 2.33).

Fig. 2.34. The scheme of circulation of oil during delay of opening or closing of valves: 1–PCM block; 2–the oil operating valve (OCV); 3–zolotnikovy valve; 4–oil pump; 5–cam-shaft; 6–executive mechanism of change of phases of a gazoraspredeleniye; 7–rotor; 8–case; 9–oil pallet; 10-to a compartment of delay of opening or closing of valves; 11-cut delays of opening or closing of valves; 12-from a compartment of an advancing of opening or closing of valves

When the zolotnikovy valve in the oil operating valve (OCV) moves to the right according to a PCM block signal, oil from the oil pump under pressure moves to the canal of delay of opening or closing of valves and in a compartment of delay of opening or closing of valves of the executive mechanism of change of phases of a gazoraspredeleniye. Then the rotor incorporated with a cam-shaft turns in the direction of delay of opening or closing of valves, against the case which is put in action from a cranked shaft, and the moment of opening or closing of valves moves towards delay (fig. 2.34).

Fig. 2.35. The scheme of circulation of oil during intermediate opening or closing of valves: 1–PCM block; 2–the oil operating valve (OCV); 3–zolotnikovy valve; 4–to a compartment of an advancing of opening or closing of valves; 5–to a compartment of delay of opening or closing of valves

The Zolotnikovy valve in the oil operating valve (OCV) settles down in intermediate situation. Hydraulic pressure remains both in an advancing compartment, and in a compartment of delay of the executive mechanism of change of phases of a gazoraspredeleniye. At the same time the corner of mutual turn of a rotor and the case does not change that gives the fixed moment of opening or closing of valves (fig. 2.35).