Through-hole connection method and connection structure of titanium aluminum turbine impeller and rotating shaft

Abstract

The invention relates to a through-hole connection structure and connection method of a titanium aluminum supercharger turbine impeller and a rotating shaft. The connection structure comprises the rotating shaft, the titanium aluminum turbine impeller and a shaft end locking nut. A through hole is formed in the center of the titanium aluminum turbine impeller. A thread is arranged at the end portion of the rotating shaft. Seen from the end of a turbine, the rotating direction of the thread is the same as the rotating direction of the turbine rotating shaft during working. The lower portion of the thread is the rotating shaft connection portion. The rotating shaft connection portion penetrates through the through hole of the turbine impeller. The rotating shaft connection portion and the turbine impeller through hole are in transition fit or interference fit. The shaft end locking nut is installed on the thread of the end portion of the rotating shaft. As for the connection problem of the titanium aluminum turbine impeller and the rotating shaft, the through-hole connection and threaded locking structure are adopted, the durable and reliable connection between the titanium aluminum turbine impeller and the 42CrMo rotating shaft can be achieved, the requirements for the connection strength of the supercharger turbine impeller and the rotating shaft are met, and meanwhile the connection structure has the advantages of being simple in structure, easy to machine and the like.

Description

technical field [0001] The invention belongs to the technical field of mechanical design and manufacture, and in particular relates to a through-hole connection method and connection structure of a titanium-aluminum supercharger turbine impeller and a rotating shaft. Background technique [0002] The turbine shaft is one of the core parts of the turbocharger, usually connected by the turbine wheel and the shaft. At present, the turbine impeller of diesel engine turbocharger for vehicles is generally made of cast nickel-based superalloy K418 material (the material density is 8.0×10 3 kg / m 3 ), the shaft is made of 42CrMo alloy steel. For the turbocharger turbine impeller made of K418 material and the shaft made of 42CrMo alloy steel, the friction welding process can be used to realize the reliable connection between the turbine impeller and the shaft to form the turbine shaft. However, due to the high density of the K418 material, the moment of inertia of the turbocharger ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the connection problem between the titanium-aluminum turbine impeller and the 42CrMo rotating shaft faced in the application process of the current titanium-aluminum alloy material in the turbocharger turbine for vehicles, and proposes a through-hole connection method and connection method between the titanium-aluminum supercharger turbine impeller and the rotating shaft. structure

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