A turbocharger structure with fixed Z bearing

Abstract

The present invention discloses a turbocharger structure for fixing a Z-bearing, characterized by comprising: an intermediate body, a Z-bearing disposed at an inner hole of the intermediate body, a first circular retaining ring groove and a second circular retaining ring groove disposed on the Z-bearing and the intermediate body, respectively; an elastic retaining ring contacting the first and second circular retaining ring grooves to achieve axial positioning between the Z-bearing and the intermediate body; first and second positioning piece mounting portions of the same diameter disposed on the Z-bearing and the intermediate body, respectively; a circular retaining piece mounted between the first and second positioning piece mounting portions, the height of the circular retaining piece being slightly lower than the lower edges of the first and second circular retaining ring grooves, and the circular retaining piece achieving radial positioning between the Z-bearing and the intermediate body. The present invention can achieve bidirectional flexible support and automatic positioning of the Z-bearing, reserve space for installing an oil baffle, and further enhance the anti-leakage capability of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of turbochargers, and in particular to a turbocharger structure with a fixed Z bearing. Background Art

[0002] In recent years, small-displacement engines, particularly those 3L and smaller, have increasingly adopted after-treatment methods such as EGR and PDF during emissions upgrades, increasing the space required for overall engine layout. While engine power output has increased, allowing 3L engines to completely replace earlier 4L and larger diesel engines, the reduced engine displacement and resulting space requirements are insufficient to offset the increased space required for after-treatment. Consequently, newly designed small-displacement engines require a more compact overall layout.

[0003] Therefore, we designed Figure 1 The Z-bearing turbocharger shown includes a compressor volute 1 , a compressor impeller 2 , an intermediate shaft 3 , a Z-bearing 4 , a turbine rotor 5 and a turbine housing 6 .

[0004] The Z-bearing 4 integrates the functions of thrust bearing and floating bearing, has a compact structure and good reliability, and is very popular in the market.

[0005] As a key component, Z bearings are usually fixed in the following three ways by different companies based on their process capabilities, manufacturing capabilities, and production costs:

[0006] The first type of fixation is Figure 2 As shown, it is fixed with an oil inlet bolt hole, that is, a special bolt is set in the oil inlet hole. The special bolt is screwed into the oil inlet screw hole and the head passes through the positioning hole set in the Z bearing to fix it. This structure requires high precision in the machining dimensions, relative positions and matching of the intermediate oil inlet hole thread, special bolt and Z bearing fixing hole, etc., and the assembly of the whole machine is complicated.

[0007] The second fixing method is Figure 3 As shown, it is fixed with an oil return locating pin, that is, a special threaded hole or a smooth hole is arranged in the direction of the intermediate oil return hole, and a special locating pin is screwed into the threaded hole or riveted into the hole. The head of the locating pin passes through the Z bearing fixing hole to fix it. This structure also requires high precision in the machining dimensions, relative positions and matching of the intermediate oil return locating pin hole, the locating pin and the Z special hole. The assembly of the whole machine is complicated, and the layout is restricted by the oil return hole.

[0008] The third fixing method is Figure 4 As shown, the structure is relatively simple, but because of the setting of the thrust baffle, it occupies the compressor end oil return cavity, which is not conducive to the return of lubricating oil, and its compressor end physical sealing ability is weaker than the previous two.

[0009] Therefore, how to fix the Z-bearing structure without reducing the volume of the compressor end oil return cavity and with a simple and reliable overall structure has become one of the difficulties in the design of Z-bearing turbochargers. Summary of the Invention

[0010] In order to overcome the above-mentioned defects of the prior art, an object of the present invention is to provide a turbocharger structure with a fixed Z bearing.

[0011] In order to achieve the purpose of the present invention, the technical solution adopted is:

[0012] A turbocharger structure with a fixed Z bearing, comprising:

[0013] An intermediate body, wherein a Z bearing is provided at an inner hole of the intermediate body, and a first circular retaining ring groove and a second circular retaining ring groove are provided on the Z bearing and the intermediate body respectively;

[0014] The elastic retaining ring is arranged in contact with the first circular retaining ring groove and the second circular retaining ring groove to achieve axial positioning between the Z bearing and the intermediate body;

[0015] The Z bearing and the intermediate body are respectively provided with a first and a second positioning piece mounting parts of the same diameter, and a circular positioning piece is installed between the first and the second positioning piece mounting parts. The height of the circular positioning piece is slightly lower than the lower edge of the first circular retaining ring groove and the second circular retaining ring. The radial positioning between the Z bearing and the intermediate body is achieved through the circular positioning piece.

[0016] In a preferred embodiment of the present invention, an oil baffle is provided between the Z bearing of the turbocharger structure and the intermediate shaft.

[0017] In a preferred embodiment of the present invention, the first and second positioning piece mounting portions are groove-shaped or hole-shaped.

[0018] In a preferred embodiment of the present invention, the first and second positioning piece mounting portions are matched crescent grooves and circular positioning holes.

[0019] The beneficial effects of the present invention are:

[0020] It can realize bidirectional flexible support and automatic positioning of the Z bearing, and reserve space for the installation of the oil baffle plate, which can further improve the anti-leakage capability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the prior art.

[0022] Figure 2 A fixed schematic diagram of the prior art Figure 1 .

[0023] Figure 3A fixed schematic diagram of the prior art Figure 2 .

[0024] Figure 4 A fixed schematic diagram of the prior art Figure 3 .

[0025] Figure 5 The structure of the present invention is schematically shown Figure 1 .

[0026] Figure 6 The structure of the present invention is schematically shown Figure 2 . DETAILED DESCRIPTION

[0027] like Figure 5 、 6 The turbocharger structure with a fixed Z bearing shown includes an intermediate body 50, an inner hole of which is provided with a Z bearing 20, and a first circular retaining ring groove 21 and a second circular retaining ring groove 51 are respectively provided on the Z bearing 20 and the intermediate body 50;

[0028] Both sides of the elastic retaining ring 30 are respectively in contact with the first circular retaining ring groove 21 and the second circular retaining ring groove 51 to achieve axial positioning between the Z bearing 20 and the intermediate body 50;

[0029] The Z bearing 20 and the intermediate body 50 are respectively provided with first and second positioning piece mounting portions 22 and 52 of the same diameter and groove type or hole type. A circular positioning piece 40 is installed between the first and second positioning piece mounting portions 22 and 52. The height of the circular positioning piece 40 is slightly lower than the lower edge of the first circular retaining ring groove 21 and the second circular retaining ring groove 51 to prevent interference with the elastic retaining ring 30. When the elastic retaining ring 30 is placed, the axial movement of the circular positioning piece 40 is automatically restricted, thereby realizing the radial positioning of the Z bearing 20 and the intermediate body 50 by the circular positioning piece 40.

[0030] During the operation of the entire machine, due to the gaps and notches between the outer circle of the Z bearing 20 and the inner hole of the intermediate body 50, the pressurized lubricating oil will fill the entire contact surface between the elastic retaining ring 30 and the Z bearing 20 and the intermediate body 50, forming elastic damping. In addition, the first and second positioning piece mounting parts 22 and 52 between the contact surfaces of the Z bearing 20 and the intermediate body 50 are also filled with pressurized lubricating oil, also forming elastic damping, thereby realizing dual axial flexible support of the Z bearing 20.

[0031] An oil baffle 10 is provided between the Z bearing 4 and the intermediate shaft 3 of the turbocharger structure, which can further enhance the anti-leakage capability of the compressor.

[0032] Compared with the prior art, this patent has the following characteristics:

[0033] 1. Simple structure and good versatility. It only requires setting a circular retaining ring groove and a crescent groove on the Z bearing, and a circular retaining ring groove and a circular positioning hole on the intermediate body. All similar products have the same Z bearing structure, and the machining dimensions of the Z bearing assembly on the intermediate body are the same. There is no need to consider the increase in the Z bearing series caused by the oil inlet and return installation dimensions.

[0034] 2. Good processability. The Z bearing and the intermediate body are respectively provided with an axial circular retaining ring groove and a radial positioning pin hole. The circular retaining ring grooves of the two are completed when the Z bearing is machined from the outer circle, and the intermediate body is completed when the inner hole is machined. At the same time, when assembling the whole machine, only the circular positioning piece needs to be placed in place. When the elastic retaining ring is simultaneously engaged with the Z bearing and the intermediate body circular retaining ring groove, the Z bearing is assembled and the positioning is automatically completed.

[0035] 3. Compact structure. The newly designed positioning structure does not require bolts or other fasteners, and can be self-locking after assembly, without occupying the compressor oil return cavity and assembly space;

[0036] 4. Axial double flexible support. During the operation of the whole machine, due to the gap and notch between the outer circle of the Z bearing and the inner hole of the intermediate body, the pressurized lubricating oil will fill the entire contact surface between the elastic ring and the Z bearing and the intermediate body, forming elastic damping. In addition, the contact surface between the Z bearing and the intermediate body is also filled with pressurized lubricating oil, also forming elastic damping, thereby achieving the double axial flexible support of the Z bearing;

[0037] 5. The anti-negative pressure capability is improved, and the design reserves space for the installation of the oil baffle, which can further improve the anti-leakage capability of the compressor.

Claims

1. A turbocharger structure with a fixed Z bearing, characterized in that: include: An intermediate body, wherein a Z bearing is provided at an inner hole of the intermediate body, and a first circular retaining ring groove and a second circular retaining ring groove are provided on the Z bearing and the intermediate body respectively; The elastic retaining ring is arranged in contact with the first circular retaining ring groove and the second circular retaining ring groove to achieve axial positioning between the Z bearing and the intermediate body; The Z bearing and the intermediate body are respectively provided with first and second positioning piece mounting parts of the same diameter, and a circular positioning piece is installed between the first and second positioning piece mounting parts. The height of the circular positioning piece is slightly lower than the lower edge of the first circular retaining ring groove and the second circular retaining ring. The radial positioning between the Z bearing and the intermediate body is achieved by the circular positioning piece; During the operation of the entire machine, there are gaps and notches between the outer circle of the Z bearing and the inner hole of the intermediate body. The pressurized lubricating oil will fill the entire contact surface between the elastic retaining ring, the Z bearing and the intermediate body, forming elastic damping. In addition, the first and second positioning piece mounting parts between the Z bearing and the intermediate body contact surface are also filled with pressurized lubricating oil, also forming elastic damping, thereby realizing double axial flexible support of the Z bearing.

2. A turbocharger structure with a fixed Z bearing according to claim 1, characterized in that: The first and second positioning piece mounting portions are groove-shaped or hole-shaped.

3. The turbocharger structure with a fixed Z bearing according to claim 1, characterized in that: The first and second positioning piece mounting portions are matched crescent grooves and circular positioning holes.

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