Turbocharger structure for fixing Z bearing

Abstract

The invention discloses a turbocharger structure for fixing a Z bearing. The structure is characterized in by comprising a middle body, the Z bearing is arranged at an inner hole of the middle body, and the Z bearing and the middle body are correspondingly provided with a first circular check ring groove and a second circular check ring groove; an elastic check ring makes contact with the first circular check ring groove and the second circular check ring groove, so that axial positioning between the Z bearing and the middle body is realized; the Z bearing and the middle body are correspondingly provided with a first positioning piece mounting part and a second positioning piece mounting part which are the same in diameter, a circular positioning piece is mounted between the first positioning piece mounting part and the second positioning piece mounting part, the height of the circular positioning piece is slightly lower than the lower edge of the first circular check ring groove and the lower edge of the second circular check ring groove, and radial positioning between the Z bearing and the middle body is realized through the circular positioning piece. Bidirectional flexible supporting and automatic positioning of the Z bearing can be achieved, the oil baffle plate mounting space is reserved, and the leakage resistance of a gas compressor can be further improved.

Description

technical field [0001] The invention relates to the technical field of turbochargers, in particular to a turbocharger structure for fixing a Z bearing. Background technique [0002] In recent years, small-displacement engines, especially 3L and below diesel engines, have mostly adopted post-processing methods such as EGR and PDF during the emission upgrade process, and the space required for the layout of the whole machine is increasing. Although the engine power has been increased, the 3L displacement can completely replace the early 4L or above displacement diesel engine, the engine displacement is reduced, and the occupied space is reduced, but it is difficult to offset the increased space for post-processing, so the newly designed small displacement engine is integrated Machine layout is more compact. [0003] Therefore, the design of the figure 1 The Z bearing turbocharger shown includes a compressor volute 1 , a compressor impeller 2 , an intermediate shaft 3 , a Z b...

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Problems solved by technology

[0006] The first fixed method is as figure 2 As shown, the oil inlet bolt hole is used to fix, that is, a special bolt is set in the oil inlet hole. When the special bolt is screwed into the oil inlet screw hole, the head passes through the positioning hole set by the Z bearing to fix it. The machining dimensions, relative positions and matching requirements of the oil inlet thread, special bolts and Z bearing fixing holes, etc. require high precision, and the assembly of the whole machine is complicated

[0007] The second fixation method is as image 3 As shown, the oil return positioning pin is used to fix, that is, a special threaded hole or a light hole is arranged in the direction of the oil return hole of the intermediate body, and the special positioning pin is screwed into the threaded hole or riveted into the hole, and the head of the positioning pin passes through the Z The bearing fixing hole is used to fix it. This structure also requires high precision for the machined size, relative position and matching of the intermediate oil return positioning pin hole, positioning pin and Z special hole. The assembly of the whole machine is complicated and the layout is subject to oil hole restriction

[0008] The third fixation method is as Figure 4 As shown, the structure is relatively simple, but because the thrust baffle is installed, it needs to occupy the oil return cavity at the compressor end, which is not conducive to the return of lubricating oil, and its physical sealing ability at the compressor end is weaker than the former two

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