Reuleaux triangle bearing type power transmission structure for turbocharger

Abstract

The invention discloses a Reuleaux triangular bearing type power transmission structure for a turbocharger, and relates to the technical field of turbochargers. The Reuleaux triangular bearing type power transmission structure for the turbocharger comprises a bearing seat and a transmission shaft arranged in the bearing seat in a penetrating mode; the left end and the right end of the transmissionshaft extend out of shaft holes of the bearing seat and are respectively provided with impellers and turbines; the bearing seat is provided with an oil inlet channel which communicates with the shaftholes; floating bearings are arranged on the transmission shaft in a sleeving mode; the floating bearings are located in the shaft holes and the two ends of the floating bearings are each provided with a retaining ring (or a limiting sleeve); the retaining rings are fixedly installed in the shaft holes and gaps are formed between the retaining rings and the end surfaces of the floating bearings;oil grooves are annularly arranged on the side wall surfaces of the floating bearings; a plurality of oil holes are formed in the groove bottoms of the oil grooves; and the outlines of cross sectionsof the floating bearings are in a Reuleaux triangle shape. According to the Reuleaux triangle bearing type power transmission structure for the turbocharger, the oil quantity and the oil pressure of lubricating oil between the floating bearings and the bearing seat can be increased, the lubricating oil is prevented from being easily sintered, contact surfaces between the floating bearings and thebearing seat are reduced, the friction is reduced, the energy consumption in an operation process is greatly reduced, and the performance of an engine is maintained.

Description

technical field [0001] The invention relates to the technical field, in particular to a Lero triangular bearing power transmission structure used for a turbocharger. Background technique [0002] Exhaust gas turbocharging technology has been used in the automotive industry for decades, and has been continuously improved and developed for decades. With the continuous development of automobile technology, the requirements for low-speed performance and transient performance of automobiles are getting higher and higher after the miniaturization and weight reduction of engines. play a vital role. [0003] A turbocharger usually includes a turbine, an impeller, and a drive shaft connecting them. With the increasing speed of the turbocharger, ordinary sliding bearings are no longer competent. Therefore, most of the turbochargers currently use floating bearings to The transmission shaft is supported, and the floating bearing is generally a tubular structure, usually including a fu...

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Problems solved by technology

[0004] In the working state, lubricating oil enters between the inner wall of the bearing seat and the bearing through the oil passage, and can enter between the inner wall of the bearing and the drive shaft from the oil hole on the side wall of the bearing, and the drive shaft is suspended and rotated at high speed through the oil film, so that the oil film Bearing the load of the bearing system, but if the amount of oil is insufficient, or the speed of lubricating oil entering the bearing seat and bearing is slow, it is easy to cause the lubricating oil to sinter due to excessive temperature, or the outer wall surface of the floating bearing will be damaged due to insufficient lubrication. Dry friction is formed between the inner wall of the bearing seat, which consumes too much energy, which can greatly affect the low-speed performance and acceleration effect of the engine, and even cause damage to the turbocharger in severe cases, even if some imported bearings are lubricated The maximum temperature of the oil can reach more than 120 degrees, which is still difficult to do

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