Frame structure integral air flue for multi-valve diesel engine

Abstract

The invention discloses a frame structure integral air flue for a multi-valve diesel engine. An air flue outer frame is provided with 4-6 cylinders; each cylinder is provided with a tangential air inlet channel and a spiral air inlet channel and a parallel air exhaust channel; the air inlet channels and the parallel air exhaust channels are uniformly distributed on the peripheries of the corresponding cylinders ; two branches of each parallel air exhaust channel are communicated with a first air exhaust valve and a second air exhaust valve respectively; the tangential and spiral air inlet channels are communicated with a first air inlet valve and a second inlet valve respectively; the air inlet cavity of each pair of tangential and spiral air inlet channels is provided with an inwardly-concave integral sand core; one end of the inwardly-concave integral sand core is connected with the outer frame, and the other end of the inwardly-concave integral sand core is connected with the tangential and spiral air inlet channels; the air flue outer frame is provided with a cooling water jacket positioning groove; and the central line of each cylinder is coincided with the central line of the positioning groove. Due to the adoption of the frame structure integral air flue, the swirl rate of each cylinder air flue can be kept uniform and consistent, each air flue core is assembled and positioned accurately, the assembling error is effectively lowered, the problem of non-uniform burning of each cylinder caused by inconsistent swirl rates is effectively improved, and the economic efficiency and discharging level of the diesel engine are improved.

Description

technical field [0001] The invention belongs to engine structure technology, and in particular relates to an air passage structure device of a multi-cylinder diesel engine. Background technique [0002] The structural parameters of the engine intake port have a great influence on the performance of combustion and emission. A well-designed intake port can improve the mixing effect of fuel and air, make combustion complete and reduce fuel consumption. In recent years, with the continuous development of diesel engine technology and the continuous improvement of vehicle exhaust emission standards in various countries, higher requirements have been put forward for the fuel system and gas distribution system related to engine combustion. Therefore, many diesel engines currently use electronically controlled high-pressure common rail technology to increase the fuel injection pressure. The ECU can precisely control the fuel injection volume, fuel injection timing, and fuel injection...

AI Technical Summary

Problems solved by technology

In addition, the positioning of the core body is not accurate during assembly, and the assembly error between the air passages will be large, resulting in the inconsistency of the swirl ratio of the air passages of each cylinder and the uneven combustion of each cylinder, which affects the economy and emission level of the diesel engine.

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