Petrol engine supercharger bypass valve

Abstract

The invention discloses a petrol engine supercharger bypass valve which comprises a bypass valve (3) and a rocking arm (2), wherein a valve connecting lug boss (9) is arranged on the bypass valve (3);the valve connecting lug boss (9) and the bypass valve (3) are in an integral structure; the end part of the rocking arm (2) is bent and pressed into a flat shape; a rocking arm connecting hole (10)is arranged on the flat shape structure; and the bypass valve (3) is connected with the rocking arm (2) by the match of the valve connecting lug boss (9) and the rocking arm connecting hole (10). Therocking arm and the bypass valve are formed by the precision casting of a novel stainless steel material melting die, and a spacer is formed by stamping novel stainless steel, therefore, the creep resistance at high temperature is ensured, the planeness of a volute attaching surface and the utilization of the supercharger on waste gas energy when an engine is at low speed are improved, the rotating freedom degree of the bypass valve is limited, the valve is prevented from generating free rotation by waste gas disturbance, the abrasion is reduced and the requirement for a high-performance petrol engine is met.

Description

technical field [0001] The invention belongs to the technical field of automobile construction, and relates to the structure of a gasoline engine supercharger, more specifically, the invention relates to a gasoline engine supercharger bypass valve. Background technique [0002] At present, engine supercharging turbine technology has been widely used. This technology usually installs an exhaust gas turbocharger on the engine, and the exhaust gas drives the turbine to rotate, driving the coaxial impeller to rotate, so that high-pressure gas enters the engine cylinder. Due to the increased air density for combustion, that is, the increased air mass, the corresponding fuel supply is more, so that the engine generates more power. The early exhaust gas turbocharger did not have a waste gas bypass device. In order to ensure that the speed of the turbocharger and the exhaust back pressure of the engine would not be too high when the engine was at high speed, the volute flow path was...

AI Technical Summary

Problems solved by technology

The early exhaust gas turbocharger did not have a waste gas bypass device. In order to ensure that the speed of the turbocharger and the exhaust back pressure of the engine would not be too high when the engine was at high speed, the volute flow path was usually made larger. The disadvantage of this structure Yes: When the engine is at low speed, the exhaust gas does less work on the turbine, the speed of the impeller is low, and the air flow is also small, so the low-speed torque of the engine is poor

After long-term operation, the pin 1 and the rocker arm 2 will wear out synchronously, the gap will increase, and the valve will not close tightly when the engine is at low speed, which will seriously affect the engine performance.

This structure is especially not suitable for gasoline engine superchargers, because the exhaust temperature of the engine reaches 950 ° C ~ 1050 ° C, regardless of material, structure, reliability can not meet the requirements

[0005] At present, domestic gasoline engine supercharging technology is still in the process of development, and there is no official patent literature that mentions a bypass valve device suitable for gasoline engine superchargers

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