CN219605625U

CN219605625U - Turbocharger shafting assembly

Info

Publication number: CN219605625U
Application number: CN202320470224.3U
Authority: CN
Inventors: 刘湘; 邱济宝
Original assignee: NINGBO WEIFU TIANLI TURBOCHARGING TECHNOLOGY CO LTD
Current assignee: NINGBO WEIFU TIANLI TURBOCHARGING TECHNOLOGY CO LTD
Priority date: 2023-03-13
Filing date: 2023-03-13
Publication date: 2023-08-29
Anticipated expiration: 2033-03-13

Abstract

The turbocharger shafting assembly comprises a rotating shaft arranged in a turbocharger, wherein one end of the rotating shaft is provided with a compressor impeller, the other end of the rotating shaft is provided with turbine blades, a ball bearing is arranged in the middle of the rotating shaft, and a shaft sleeve is arranged at the position of the rotating shaft between the ball bearing and the compressor impeller; an oil groove is formed in the outer surface of the ball bearing and is communicated to the inner cavity of the ball bearing through an oil groove hole; an inner bearing sleeve oil cavity with a concave structure is arranged on the inner wall of the ball bearing, which is in contact with the rotating shaft. According to the utility model, the ball bearing is provided with a unique oil path structure, so that lubricating oil can be fully distributed in the oil groove and enter a gap between the inner bearing sleeve and the outer bearing sleeve through the oil groove hole to lubricate, a hydraulic oil film can be formed during working, vibration from a rotating shaft is absorbed, and NVH performance is improved.

Description

Turbocharger shafting assembly

Technical Field

The utility model belongs to the technical field of turbochargers, and particularly relates to a turbocharger shafting assembly.

Background

Turbocharging is a technology widely applied to vehicles, and utilizes heat energy, kinetic energy, and the like in exhaust gas discharged during engine operation to push a turbine in a turbine box, then drives a coaxial impeller to form a rotor assembly, and the impeller compresses air sent by an air inlet pipeline to enable the air to enter an engine combustion chamber after being pressurized, so that sufficient air quantity is provided, and the high combustion efficiency of the engine is ensured.

In the prior art, a turbocharger is provided with a shafting assembly, which comprises a rotating shaft and a bearing arranged on the rotating shaft, wherein the bearing can be a sleeve type floating bearing or a ball bearing with a relatively complex structure. Among them, the use of ball bearings can improve the low-speed efficiency of the supercharger, but in the conventional structure, the ball bearings are in rigid contact, vibration transmitted from the rotor to the bearing outer bearing housing cannot be absorbed, and NVH performance is poor.

In addition, since the ball bearing itself is characterized by point contact, the mechanical efficiency is high, but too much lubricating oil between the balls will cause large rotation resistance of moving parts such as the balls, so the design of the oil path in the ball bearing needs to be improved, and the utility model further designs and improves the design.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides the turbocharger shafting assembly, the shafting assembly adopts the ball bearing, the ball bearing is provided with a unique oil way structure, a hydraulic oil film can be generated during working, the lubricating effect is good, and the overall operation efficiency of the supercharger is improved.

The utility model is solved by the following technical scheme.

The turbocharger shafting assembly comprises a rotating shaft arranged in a turbocharger, wherein one end of the rotating shaft is provided with a compressor impeller, the other end of the rotating shaft is provided with turbine blades, a ball bearing is arranged in the middle of the rotating shaft, and a shaft sleeve is arranged at the position of the rotating shaft between the ball bearing and the compressor impeller; an oil groove is formed in the outer surface of the ball bearing and is communicated to the inner cavity of the ball bearing through an oil groove hole; an inner bearing sleeve oil cavity with a concave structure is arranged on the inner wall of the ball bearing, which is in contact with the rotating shaft.

Preferably, the ball bearing comprises an inner bearing sleeve and an outer bearing sleeve assembled together with a gap therebetween and forming an internal cavity; and a plurality of balls are arranged in the inner cavities at the two ends of the ball bearing.

Preferably, the outer bearing sleeve is provided with a first lower oil hole for oil supply and outflow.

Preferably, a ball sleeve is arranged in the gap at the two ends of the ball bearing, the balls are arranged in holes in the ball sleeve, the mounting structure is stable, and the assembly strength is high.

Preferably, the inner bearing sleeve is composed of two symmetrically arranged inner bearing sleeve halves, and the contact and pressing are carried out between the mutually contacted end surfaces of the two inner bearing sleeve halves in operation to provide axial supporting force.

Preferably, an annular boss protruding outwards is arranged on the periphery of the shaft seal sleeve and used for assembling the oil baffle.

Preferably, the ball bearing is provided with a notch for positioning, and the ball bearing can be limited through a limiting boss so as to avoid rotation of the outer bearing sleeve.

Preferably, two concave annular oil grooves are arranged on the outer surface of the ball bearing, and a central groove formed by concave is arranged between the two oil grooves and is used for oil supply flow and lubrication.

In the shafting assembly, the unique oil way structure is arranged on the ball bearing, so that lubricating oil can be fully distributed in the oil groove and enter a gap between the inner bearing sleeve and the outer bearing sleeve through the oil groove hole to lubricate, a hydraulic oil film can be formed during working, vibration from a rotating shaft is absorbed, and NVH performance is improved. Specifically, because the lubricating oil flows fully, a hydraulic oil film can be formed on the axial outer surface and the radial outer surface of the ball bearing, and oil storage cavities on two sides are used for storing the lubricating oil, so that the ball bearing is always in a state of being saturated with the lubricating oil.

Compared with the prior art, the utility model has the following beneficial effects: the turbocharger shafting assembly has the advantages that the ball bearing is adopted in the shafting assembly, the ball bearing is provided with a unique oil way structure, a hydraulic oil film can be generated during operation, the lubricating effect is good, and the overall operation efficiency of the turbocharger is improved.

Drawings

FIG. 1 is a cross-sectional view of the shafting assembly of the present utility model assembled to a center housing.

Fig. 2 is an enlarged view of the area a in fig. 1.

Fig. 3 is an enlarged view of the area A1 in fig. 2.

Fig. 4 is an enlarged view of the area A2 in fig. 2.

Fig. 5 is a perspective view of a shafting assembly in accordance with the present utility model.

Fig. 6 is a perspective view of an oil deflector according to the present utility model.

Fig. 7 is a perspective view of a ball bearing in the present utility model.

Fig. 8 is a cross-sectional view of a ball bearing in the present utility model.

Description of the embodiments

The utility model is described in further detail below with reference to the drawings and the detailed description.

In the following embodiments, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout, and the embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

Referring to fig. 1 to 8, the shafting assembly of the ball bearing turbocharger in the present utility model is disposed in a central housing 2, and specifically, the shafting assembly includes a rotating shaft 9, two ends of the rotating shaft 9 are respectively connected with a compressor impeller 7 and a turbine blade 6, the rotating shaft 9 is provided with a ball bearing 8, and the central housing 2 is provided with an oil inlet 21 and an oil outlet 23.

In the supercharger of the present utility model, the ball bearing 8 comprises an inner bearing sleeve 84 and an outer bearing sleeve 81 which are sleeved together, a gap is provided between the inner bearing sleeve 84 and the outer bearing sleeve 81, and balls 82 are arranged in the gap; at least one circumferentially distributed oil groove 87 is arranged on the periphery of the outer bearing sleeve 81, an oil groove hole 871 communicated to the gap is arranged in the oil groove 87, and an oil outlet 881 is further arranged on the outer bearing sleeve 81. Further, the ball sleeves 83 are arranged in the gaps at the two ends of the ball bearing 8, and the balls 82 are arranged in holes in the ball sleeves 83, so that the structure is stable and the working efficiency is high. And, be equipped with two annular oil grooves 87 on the periphery of outer bearing housing 81, be equipped with central recess 88 between two oil grooves 87, oil groove 87 and central recess 88 are the surface concave formation of outer bearing housing 81.

In the utility model, the oil inlet 21 is communicated with the transverse oil groove 218 in the central shell 2, and the transverse oil groove 218 is communicated with the oil groove oil storage cavity 24 through the transverse oil groove 219, so that the supply and flow uniformity of lubricating oil are ensured.

In addition, in the present utility model, the ball bearing 8 is placed in an assembly chamber in the center housing 2, and a plurality of protruding inner ring protrusions 271 are provided on the inner wall of the assembly chamber to position the outer surface of the outer bearing housing 81 and form a hydraulic oil film at that position; an oil groove reservoir 24 and a central reservoir 28 are respectively formed between the inner wall of the assembly chamber and the outer wall of the outer bearing housing 81 in the areas corresponding to the oil groove 87 and the central groove 88, and lubricating oil can fill the oil groove reservoir 24 and the central reservoir 28 and enter the ball bearing; the outer bearing sleeve 81 is provided with a first lower oil hole 881 at a lower position of the central groove 88, and a second lower oil hole 26 is provided at a corresponding position on the wall of the assembly cavity and is communicated with the oil outlet cavity 22 for discharging oil to form a part of a circulating oil path.

In the ball bearing 8 of the present utility model, the inner wall of the inner bearing sleeve 84 is also provided with a concave inner bearing sleeve oil cavity 841 for oil storage, so that a hydraulic oil film can be formed between the inner wall of the inner bearing sleeve and the surface of the rotating shaft 9, and the inner bearing sleeve 84 of the present utility model is composed of two symmetrically arranged inner bearing sleeve halves, and contacts and presses during operation to provide axial supporting force.

In the supercharger according to the present utility model, a shaft sleeve 74 is provided on a side of the ball bearing 8 facing the compressor wheel 7, an oil seal cover 71 and a pressure plate 72 are provided on a radial outer periphery of the shaft sleeve 74, a first side oil storage chamber 78 is provided between the oil seal cover 71 and the pressure plate 72, and a second side oil storage chamber 79 is provided on the other side of the ball bearing 8; the upper parts of the first side oil storage cavity 78 and the second side oil storage cavity 79 are both communicated to a gap between the inner bearing sleeve 84 and the outer bearing sleeve 81, the lower parts of the first side oil storage cavity 78 and the second side oil storage cavity 79 are communicated to the oil outlet cavity 22, and the oil outlet hole 23 is arranged at the lower part of the oil outlet cavity 22.

Further, in the structure of the present utility model, the first side oil storage chamber 78 is provided with an oil baffle 73, and an outer edge 732 of the oil baffle 73 is positioned between the oil seal cover 71 and the pressure plate 72; the inner edge 731 of the oil deflector 73 is located on one side of the annular boss 742 on the shaft envelope 74, and a gap 739 is provided between the inner edge 731 and the annular boss 742. In this structure, the outer edge 732 of the oil deflector 73 is fixed, and the inner edge 731 can move within a certain range, for example: the gap 739 can be selectively maintained or moved according to the oil pressure change of the two sides of the oil baffle 73, and the gap 739 can be eliminated, so that the negative pressure resistance of the supercharger can be greatly improved, and the oil leakage risk of the pressure end of the supercharger can be reduced.

In addition, the oil baffle 73 is provided with a bending layer 734 protruding towards the oil cover 71 to enhance the deformability and strength of the whole oil baffle 73, and the lower area of the oil baffle 73 is provided with a bending plate 733, so that the first side oil storage cavity 78 of the area is communicated to the oil outlet cavity 22 for oil outlet, and forms a part of a circulating oil path. By matching the newly designed oil baffle 73 with the shaft sleeve 74, the negative pressure resistance of the supercharger can be greatly improved, and the oil leakage risk of the pressure end of the supercharger can be reduced.

In the present utility model, a notch for avoiding interference with the bending plate 733 is provided at the lower part of the pressing plate 72; the surface of the pressing plate 72 facing the ball bearing 8 is provided with a limit boss 727 with an integrated structure or an independent structure, and the limit boss 727 abuts against the notch 818 of the outer bearing sleeve 81 so as to prevent the outer bearing sleeve 81 from rotating.

As can be seen from the above description, in the utility model, the oil floating bearing in the shafting assembly is changed into the ball bearing, so that the low-speed response performance of the engine is greatly improved. Meanwhile, the side oil storage cavities are additionally arranged on the two side surfaces of the bearing outer bearing sleeve, the oil grooves 87 and the central grooves 88 are additionally arranged on the radial outer surface of the bearing outer bearing sleeve, and an axial and radial hydraulic oil film can be formed during operation so as to absorb vibration from a rotor and improve NVH performance. The ball bearing is in point contact, the mechanical efficiency is high, and if too much lubricating oil between the balls causes large rotation resistance of moving parts such as the balls, the oil way in the utility model is beneficial to improving the flow efficiency of the lubricating oil and the shafting efficiency, and simultaneously, the heat transfer from the turbine end to the compressor end can be reduced.

The scope of the present utility model includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the utility model.

Claims

1. A turbocharger shafting assembly, characterized by: the shafting assembly comprises a rotating shaft (9) arranged in the turbocharger, one end of the rotating shaft (9) is provided with a compressor impeller (7), the other end of the rotating shaft (9) is provided with turbine blades (6), a ball bearing (8) is arranged at the middle position of the rotating shaft (9), and a shaft sleeve (74) is arranged at the rotating shaft position between the ball bearing (8) and the compressor impeller (7);

an oil groove (87) is formed in the outer surface of the ball bearing (8), and the oil groove (87) is communicated to the inner cavity of the ball bearing (8) through an oil groove hole (871);

an inner bearing sleeve oil cavity (841) with a concave structure is arranged on the inner wall of the ball bearing (8) contacted with the rotating shaft (9).

2. A turbocharger shafting assembly according to claim 1, wherein: the ball bearing (8) comprises an inner bearing sleeve (84) and an outer bearing sleeve (81) which are assembled together, wherein a gap is formed between the inner bearing sleeve (84) and the outer bearing sleeve (81) and an inner cavity is formed;

a plurality of balls (82) are arranged in the inner cavities at the two ends of the ball bearing (8).

3. A turbocharger shafting assembly of claim 2, wherein: the outer bearing sleeve (81) is provided with a first lower oil hole (881) for oil supply and outflow.

4. A turbocharger shafting assembly of claim 2, wherein: a ball sleeve (83) is arranged in a gap between two ends of the ball bearing (8), and the balls (82) are arranged in holes in the ball sleeve (83).

5. A turbocharger shafting assembly of claim 2, wherein: the inner bearing sleeve (84) is formed from two symmetrically disposed inner bearing sleeve halves.

6. A turbocharger shafting assembly according to claim 1, wherein: an annular boss (742) protruding outwards is arranged on the periphery of the shaft seal sleeve (74).

7. A turbocharger shafting assembly according to claim 1, wherein: the ball bearing (8) is provided with a notch (818) for positioning.

8. A turbocharger shafting assembly according to claim 1, wherein: two concave annular oil grooves (87) are formed in the outer surface of the ball bearing (8), and a center groove (88) formed by concave is formed between the two oil grooves (87).