TAILIEUCHUNG - The Motor Vehicle 2010 Part 6

Tham khảo tài liệu 'the motor vehicle 2010 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 374 The Motor Vehicle Solex unit had simply an on-off control while later versions were progressive having positive-feel two- or three-position rotary disc valve controls. A slightly different application of the multi-hole disc valve principle can be seen in Fig. . In Fig. the main view is of the early version while the scrap view left shows the modification for the two-position version. In the original version the orifice Ga metered the flow of air from immediately upstream of the venturi into the starter chamber. The disc valve opened and closed two ducts simultaneously. One of these was the small duct D which drew fuel from the starter well integral with the float chamber shown in the sectioned view on the right. The other was the much larger duct leading from the bottom of the starter chamber to a point downstream of the throttle valve. When these two ducts were open an extra supply of fuel was drawn from the starter well mixed with the air in the starter chamber and delivered down through the large duct directly into the induction pipe. The strength of the mixture was determined by the sizes of the slow running jet Gs and the orifice D. This system of course can operate only when the throttle valve is closed. In the diagram Sb is the idling mixture air bleed Gs the slow running jet G the main jet and g the air bleed orifice for the main jet emulsion system. In the modified version scrap view on left part of the upper portion of the disc is dished to embrace both the fuel inlet D and two ducts. One is from the slow running well and the other an extra air bleed Z from immediately downstream of the venturi where when the throttle is closed the air pressure is atmospheric. In the crown of the dished section is the metering hole Hc through which is drawn an emulsified mixture of fuel and air from these two ducts. This emulsion is then mixed with the air in the starter chamber and passes on as before down through the duct into the induction pipe. The .

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