Thread interference locking connection method and connection structure for rotating shaft of titanium aluminum supercharger turbine

Abstract

The invention relates to a thread interference locking connection method and a connection structure for a rotating shaft of a titanium aluminum supercharger turbine. The connection structure comprises the titanium aluminum turbine (2), the 42CrMo alloy rotating shaft (1) and an elastic cylindrical locking dowel (3). An outer thread is arranged on the end portion of the titanium aluminum turbine (2), and the rotation direction of the outer thread is the same as the rotation direction of a turbine impeller from the turbine end. An inner thread in interference fit with the outer thread on the end portion of the titanium aluminum turbine (2) is arranged on the end portion of the 42CrMo alloy rotating shaft (1). A dowel hole used for assembling the elastic cylindrical locking dowel (3) is formed in the matching portion of the titanium aluminum turbine (2) and the 42CrMo alloy rotating shaft (1), the axial included angle between the dowel hole and the 42CrMo alloy rotating shaft is 15-30 degrees, and therefore the titanium aluminum supercharger turbine impeller and the 42CrMo alloy rotating shaft can be connected lastingly and reliably. In addition, the technical process is simple, engineering can be achieved easily, and the connection strength requirement of the supercharger turbine rotating shaft can be met.

Description

technical field [0001] The invention belongs to the technical field of turbocharging for vehicles, and in particular relates to a thread interference locking connection method and a connection structure of a turbine shaft of a titanium-aluminum supercharger. Background technique [0002] The turbine shaft is one of the core components of the vehicle turbocharger, which is connected by the turbine and the shaft. At present, the turbocharger of diesel engine turbocharger for vehicles is generally made of cast nickel-based superalloy K418 (the material density is 8.0×10 3 kg / m 3 ), the shaft is made of 42CrMo alloy steel. For the turbocharger turbine made of K418 alloy and the shaft made of 42CrMo alloy steel, the friction welding process can usually be used to achieve a reliable connection of the turbine shaft. However, due to the relatively high density of the K418 alloy, the moment of inertia of the turbocharger made of the K418 alloy is also relatively large, resulting i...

AI Technical Summary

Problems solved by technology

Among them, the two patents with patent numbers 97125874.0 and 200810110548.6 propose to directly adopt the method of mechanical interference connection to realize the connection between the titanium-aluminum alloy turbine and the 42CrMo alloy shaft. High, and the working speed of the supercharger fluctuates greatly, it will be difficult to effectively guarantee the long-term stability of the connection strength between the titanium aluminum alloy turbine and the 42CrMo alloy shaft by directly adopting the method of mechanical interference connection

The patent No. 201310166758.8 proposes a connection method and connection structure combining interference threads and pins to prevent loosening. The titanium-aluminum alloy turbine adopts internal threads, and the 42CrMo alloy shaft adopts external threads. The pin holes are parallel to the axis of the turbine shaft. Although the method and connection structure can realize the reliable connection of the titanium-aluminum turbine shaft, due to the poor cutting performance of the titanium-aluminum alloy material, the titanium-aluminum alloy turbine is prone to cracking in the process of machining internal threads and the machining accuracy is generally not high. , due to the long turbine shaft of the supercharger, it is difficult to process the pin holes parallel to the axis of the turbine shaft

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