Gasoline engine turbocharger

Abstract

The invention discloses a gasoline engine turbocharger, which comprises a worm wheel casing, a middle body and a compressor casing, wherein the worm wheel casing, the middle body and the compressor casing are connected together. A worm in the turbocharger is provided with a hollow portion, a worm wheel and the worm are fixedly installed together by adopting an electron beam welding process, a heat shield is arranged between the middle body and the worm wheel casing, and a lubricating oil cavity and a cooling water cavity are arranged in the middle body. The worm wheel casing is formed by casting nodular cast iron, an inner thrust bearing is arranged between the middle body and a worm wheel shaft, an outer thrust bearing is arranged between the compressor casing and the worm wheel shaft, and a thrust piece is arranged between the inner thrust bearing and the outer thrust bearing. A sealing sleeve is sleeved on the worm wheel shaft, the outer thrust bearing is installed on the sealing sleeve, and an actuator comprises an air-release valve and an air valve connecting rod. The gasoline engine turbocharger effectively block heat transfer from the worm wheel end to the middle body, ensures lubrication quality of lubricating oil at the worm wheel end, solves the problems including worm wheel shaft getting-stuck, shaft grinding and the like caused by lubrication failure of a floating bearing, and solves the problem that the side of an air compressor of the gasoline engine turbocharger leaks oil.

Description

technical field [0001] The invention relates to a turbocharger, in particular to a gasoline engine turbocharger. Background technique [0002] The turbocharger itself is not a power source, it uses the remaining energy in the exhaust of the engine to work, its function is to provide more air to the engine, the turbocharger is installed on the engine exhaust pipe, and the engine cylinder discharges The exhaust gas drives the turbine to rotate, and then drives the compressor impeller to pressurize the air filtered by the air filter and send it into the cylinder. Because the air entering the cylinder increases, more fuel is injected or the fuel is burned more fully. As a result, the engine generates more power, so the turbocharger has the advantages of increasing power, reducing fuel consumption, increasing low-speed torque, reducing exhaust pollution, and recovering plateau power while the structure of the gasoline engine remains unchanged. However, Because the turbocharger u...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a turbocharger for a gasoline engine, which can solve the problems of the floating bearing at the turbine end caused by the failure of lubrication due to the influence of temperature and heat transfer.

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