Turbocharger bearing assembly

Abstract

The utility model discloses a bearing assembly of a turbocharger, which is high in assembling position consistency of a positioning pin and stable and reliable in operation, and comprises a shell, a first cross hole and a second cross hole, a bearing is arranged in the through hole and provided with an oil passing hole communicating with the first cross hole and a connecting hole opposite to the second cross hole. A blocking part which shrinks inwards is arranged in the second cross hole, and a blocking shoulder which expands outwards is arranged on the peripheral side of the positioning pin; the head of the positioning pin is inserted into the second cross hole to a preset position in the first direction, under the preset position, the end face of the blocking shoulder abuts against the end face of the tail of the blocking part so as to limit movement of the positioning pin in the first direction, and under the preset position, a main body of the positioning pin is matched in the second cross hole; the head of the positioning pin enters the connecting hole and is matched and connected with the connecting hole; the utility model relates to the technical field of turbochargers.

Description

Technical Field

[0001] The utility model relates to the technical field of turbochargers, more specifically to a bearing assembly of a turbocharger. Background Art

[0002] An exhaust-driven turbocharger includes a rotating group that includes a turbine wheel and a compressor wheel connected to each other by a shaft. During operation, the shaft can be expected to rotate at speeds in excess of 200,000 rpm, depending on factors such as the size of the various turbocharger components. To ensure proper rotor dynamic performance, the rotating group should be well balanced and well supported.

[0003] In many conventional arrangements, the turbocharger shaft is rotatably supported within the intermediate housing by one or more bearings (e.g., oil-lubricated, air bearings, ball bearings, magnetic bearings, etc.). In some arrangements, the one or more bearings may be positioned in the bore of the intermediate housing by one or more locating mechanisms. For example, a locating pin may be employed as part of the locating mechanism to position the semi-floating bearing in the bore of the housing.

[0004] In the conventional turbocharger bearing assembly (please refer to the turbocharger housing and bearing locating pin disclosed in announcement number CN103122775B, and paragraphs 0016 to 0018 of the specific implementation method of the specification), the diameter of the upper cross hole is larger than the diameter of the lower cross hole for the locating pin to pass through, and the diameter of the lower cross hole is smaller than the diameter of the locating pin for the locating pin to perform interference fit. The structural design limits the locating pin to only one way of assembling, that is, inserting the tail of the locating pin through the head of the cross hole at the upper part of the through hole, and continuously pressing down the locating pin with the help of a guide tool. The locating pin is installed so that the tail end of the locating pin passes through the hole on the bearing, enters into the cross hole at the bottom of the through hole and is interference fit with the cross hole at the bottom, so that the locating pin reaches a preset assembly position. At the preset assembly position of the locating pin, the head of the locating pin is in the hole on the bearing. After the above assembly is completed, the bearing can be limited. However, due to the lack of a suitable limiting structure, the assembly position of the locating pin is inconsistent. If the preset position is not reached, the connection stability of the locating pin is poor. If it exceeds the preset position, it may cause excessive deformation of some structures and the operating reliability of the device is low. Utility Model Content

[0005] In view of the shortcomings and defects of the prior art, a bearing assembly of a turbocharger is provided, which has high consistency in the assembly position of a locating pin and stable and reliable operation.

[0006] The bearing assembly of the turbocharger includes:

[0007] A shell, wherein the shell is provided with a through hole and a second cross hole intersecting with the through hole;

[0008] A bearing is arranged in the through hole, and the bearing is provided with a connecting hole opposite to the second cross hole;

[0009] The second cross hole is provided with an inwardly contracted blocking portion.

[0010] A positioning pin, wherein a shoulder extending outward is arranged around the positioning pin;

[0011] The head of the locating pin is inserted into the second cross hole along the first direction to a preset position. At the preset position, the end face of the shoulder abuts against the tail end face of the blocking portion to limit the movement of the locating pin along the first direction. At the preset position, the main body of the locating pin fits into the second cross hole, and the head of the locating pin enters the connecting hole and cooperates with the connecting hole to connect.

[0012] After adopting the above structure, the bearing assembly of the turbocharger of the utility model has the following advantages compared with the prior art: when assembling the positioning pin, the head of the positioning pin is first inserted into the second cross hole along the first direction, and after being inserted to the preset position, the upper end surface of the shoulder and the bottom end surface of the blocking portion can abut against each other to avoid excessive insertion of the positioning pin, so that the positioning pin is accurately and stably placed at the preset position;

[0013] When the locating pin is in the preset position, the locating pin body fits into the second cross hole, and the locating pin head enters the connecting hole and cooperates with the connecting hole to position the bearing in the through hole, ensuring that the locating pin will not fall out during operation, thereby making the device highly reliable.

[0014] As an improvement of the present invention, the second cross hole is sequentially arranged along the first direction in a second section and a first section, the aperture of the first section is smaller than the aperture of the second section, and the end surface of the head portion after the diameter of the second section is enlarged forms the blocking portion;

[0015] The positioning pin includes a clearance fit section arranged at a first end and an interference fit section arranged at a second end;

[0016] The diameter D of the interference fit section is greater than the diameter D of the clearance fit section.

[0017] Wherein, after the diameter of the interference fit section is enlarged, the end surface of the head portion forms the stop shoulder.

[0018] As an improvement of the present invention, the clearance fit section is clearance-fitted with the connecting hole, and the diameter D of the clearance fit section is smaller than the hole diameter of the first section and the hole diameter of the second section, and the interference fit section is interference-fitted with the second section.

[0019] As an improvement of the present invention, the shell is also provided with a first cross hole intersecting with the through hole, and the bearing is provided with an oil hole connected with the first cross hole, and the first cross hole and the first section and the second section are vertically arranged along the same axis A.

[0020] As an improvement of the present invention, the diameter D of the first cross hole is smaller than or equal to the hole diameter of the first section.

[0021] As an improvement of the present invention, the axis A and the axis B of the through hole are perpendicular to each other.

[0022] As an improvement of the utility model, an annular groove is provided at the tail of the clearance fitting section.

[0023] As an improvement of the present invention, the diameters of the tail opening of the first section and the tail opening of the second section are enlarged.

[0024] As an improvement of the utility model, the housing is provided with a lubricant channel, and the lubricant channel is communicated with the head of the first cross hole.

[0025] As an improvement of the present utility model, an assembly opening is provided at the tail of the second section corresponding to the lower part of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0027] Figure 2 The utility model Figure 1 Enlarged schematic diagram of the structure at point C in the middle.

[0028] Figure 3 It is a schematic diagram of the positioning pin structure of the utility model.

[0029] Figure 4 It is a schematic diagram of the cross-sectional structure of the shell of the utility model.

[0030] Figure 5 The utility model Figure 4 Enlarged schematic diagram of the structure at point D in the middle.

[0031] As shown in the figure: 1. Shell; 1.1. Through hole; 1.2. First cross hole; 1.21. Diameter D of the first cross hole; 1.3. Second cross hole; 1.31. First section; 1.32. Second section; 1.33. Blocking part; 1.4. Lubricant channel; 1.5. Assembly port; 2. Bearing; 2.1. Oil hole; 2.2. Connecting hole; 2.3. Inner hole; 3. Locating pin; 3.1. Clearance fit section; 3.11. Ring groove; 3.12. Diameter D of clearance fit section; 3.2. Interference fit section; 3.21. Shoulder; 3.22. Diameter D of interference fit section. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] See also Figure 1-5 As shown, a bearing assembly of a turbocharger comprises:

[0034] A housing 1, wherein the housing 1 is provided with a through hole 1.1 and a second cross hole 1.3 intersecting with the through hole 1.1;

[0035] A bearing 2 is disposed in the through hole 1.1, and the bearing 2 is provided with a connecting hole 2.2 opposite to the second cross hole 1.3;

[0036] The second cross hole 1.3 is provided with an inwardly contracted blocking portion 1.33;

[0037] The locating pin 3, the head of the locating pin 3 is inserted into the second cross hole 1.3 to a preset position along the first direction. At the preset position, an outwardly expanding shoulder 3.21 is provided on the periphery of the locating pin 3. The end face of the shoulder 3.21 abuts against the tail end face of the blocking portion 1.33 to limit the movement of the locating pin 3 along the first direction. At the preset position, the main body of the locating pin 3 fits into the second cross hole 1.3, and the head of the locating pin 3 enters into the connecting hole 2.2 and is matched and connected with the connecting hole 2.2.

[0038] When assembling the positioning pin 3, firstly insert the head of the positioning pin 3 into the second cross hole 1.3 along the first direction. After being inserted to the preset position, the upper end surface of the stop shoulder 3.21 and the bottom end surface of the blocking portion 1.33 can abut against each other to avoid excessive insertion of the positioning pin 3, so that the positioning pin 3 is accurately and stably placed at the preset position.

[0039] When the locating pin 3 is in the preset position, the main body of the locating pin 3 fits into the second cross hole 1.3, and the head of the locating pin 3 enters the connecting hole 2.2 and cooperates with the connecting hole 2.2 to position the bearing 2 in the through hole 1.1, ensuring that the locating pin 3 will not fall out during operation, thereby making the device highly reliable.

[0040] See also Figure 1-2 As shown, the second cross hole 1.3 is sequentially arranged along the first direction with a second section 1.32 and a first section 1.31, the aperture of the first section 1.31 is smaller than the aperture of the second section 1.32, and the end surface of the head of the second section 1.32 forms a blocking portion 1.33 after the diameter is enlarged;

[0041] The positioning pin 3 comprises a clearance fitting section 3.1 arranged at the first end, and an interference fitting section 3.2 arranged at the second end;

[0042] The diameter D3.22 of the interference fit section 3.2 is greater than the diameter D3.12 of the clearance fit section 3.1.

[0043] When the diameter of the interference fit section 3.2 is enlarged, a shoulder 3.21 is formed on the head end surface.

[0044] After the above improvement, the second cross hole 1.3 is a stepped hole structure. After the hole body of the second section 1.32 with a larger aperture is opened, since the aperture of the second section 1.32 is larger than the aperture of the first section 1.31, there is an aperture span between them, so a blocking portion 1.33 can be formed at the head of the second section 1.32;

[0045] The locating pin 3 is a structural setting adapted to the second cross hole 1.3. Since the diameter of the interference fit section 3.2 is larger than the diameter of the clearance fit section 3.1 and there is a diameter span between them, a shoulder 3.21 can be formed at the head of the interference fit section 3.2 after processing is completed. The processing and forming of the shoulder 3.21 and the blocking portion 1.33 in the present application are simple and low-cost, and the operation is stable and reliable.

[0046] See also Figure 1-5 As shown, the clearance fit section 3.1 is clearance-fitted with the connecting hole 2.2, and the diameter D3.12 of the clearance fit section 3.1 is smaller than the aperture of the first section 1.31 and the aperture of the second section 1.32, and the interference fit section 3.2 is interference-fitted with the second section 1.32. After the above improvement, after the locating pin 3 is assembled to the preset position, the clearance fit section 3.1 enters the connecting hole 2.2 and is clearance-fitted with the connecting hole 2.2, and the interference fit section 3.2 enters the second section 1.32 and is interference-fitted with the second section 1.32;

[0047] After the above assembly is completed, the locating pin 3 is in a stable position after interference fit, and the bearing 2 can be positioned in the through hole 1.1, ensuring that the locating pin 3 and the bearing 2 will not fall out during operation, so that the device has high operating reliability;

[0048] In addition, the clearance fit between the clearance fit section 3.1 and the connecting hole 2.2 can ensure that during the assembly process, the clearance fit section 3.1 will not cause deformation of the bearing 2 and the connecting hole 2.2, and since the clearance fit section 3.1 will not contact the hole wall of the second cross hole 1.3 during the assembly process, no rough surface will appear due to contact. The wall surface of the clearance fit section 3.1 is smoother, and the connection effect with the bearing 2 is better, avoiding affecting the operation of the bearing 2, and further improving the reliability of the operation of the device.

[0049] See also Figure 1-5 As shown, the housing 1 is further provided with a first cross hole 1.2 intersecting with the through hole 1.1, the bearing 2 is provided with an oil hole 2.1 communicating with the first cross hole 1.2, and the first cross hole 1.2 and the first section 1.31 and the second section 1.32 are vertically arranged along the same axis A. The axis A is perpendicular to the axis B of the through hole 1.1.

[0050] See also Figure 1-5 As shown, the diameter D1.21 of the first cross hole 1.2 is smaller than or equal to the hole diameter of the first section 1.31.

[0051] After the above improvements, the present invention is different from the conventional turbocharger bearing 2 assembly in that: the first cross hole 1.2 of the present invention does not need to be passed through by the positioning pin 3, so the diameters of the first cross hole 1.2 and the second cross hole 1.3 of the present invention can be the same or different. When the diameters are the same and the same axis A is set, the first cross hole 1.2 and the second cross hole 1.33 can be completed by the same processing step;

[0052] In addition, since the positioning pin 3 does not need to pass through a plurality of holes, the number of guiding tools and assembly processes required when assembling the positioning pin 3 is relatively small, and the assembly steps are more reasonable.

[0053] The bearing 2 assembly of the conventional turbocharger (please refer to the turbocharger housing 1 and the bearing 2 locating pin 3 disclosed in announcement number CN103122775B, and paragraphs 0016 to 0018 of the specific implementation method of the specification thereof) has a cross hole of an upper portion with a diameter larger than that of a cross hole of a lower portion for the locating pin 3 to pass through, and a cross hole of a lower portion with a diameter smaller than that of a locating pin 3 for interference fit. The structural design limits the locating pin 3 to only one preferred assembly method, namely: inserting the tail of the locating pin 3 through the head of the cross hole of the upper portion of the through hole 1.1, and continuously pressing the locating pin 3 downward with the help of a guiding tool, so that the tail end of the locating pin 3 passes through the hole body on the bearing 2, enters into the cross hole of the lower portion of the through hole 1.1 and is interference fit with the cross hole of the lower portion, and the head of the locating pin 3 is in the hole body on the bearing 2. After the above assembly is completed, the bearing 2 can be limited. However, the structural design of the bearing 2 assembly of the conventional turbocharger is unreasonable, resulting in more stringent requirements on the processing technology, more assembly steps, and more guiding tools.

[0054] See also Figure 3 As shown, the tail of the clearance fitting section 3.1 is provided with an annular groove. After the above improvements, the structure layout is reasonable and the operation is reliable.

[0055] See also Figure 4-5 As shown, the diameter of the tail opening of the first section 1.31 and the tail opening of the second section 1.32 are enlarged. After the above improvement, it is beneficial for the positioning pin 3 to enter the second cross hole 1.3 steadily and smoothly.

[0056] The housing 1 is provided with a lubricant channel 1.4, which is connected to the head of the first cross hole 1.2. After the above improvement, the lubricant in the lubricant channel 1.4 enters the oil hole 2.1 through the first cross hole 1.2, and enters the two ends of the bearing 2 through the inner hole 2.3 of the bearing 2, playing a role in lubricating and cooling the components at the two ends;

[0057] In addition, there are gaps at the position on the circumferential side of the bearing 2 opposite to the tail end of the first cross hole 1.2 and the position opposite to the head of the second cross hole 1.3. The lubricant entering the first cross hole 1.2 can also enter the gap, and the components in the through hole 1.1 play a role in lubrication and heat dissipation.

[0058] See also Figure 4-5 As shown, the lower part of the housing 1 is provided with an assembly opening 1.5 corresponding to the tail of the second section 1.32. With the above improvement, when assembling the positioning pin 3, the positioning pin 3 can be inserted from the assembly opening 1.5 to the tail end of the second cross hole 1.3 with the help of a guiding tool, and the assembly opening 1.5 plays a role of avoidance.

[0059] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A bearing assembly for a turbocharger, characterized in that: include: A shell (1), wherein the shell (1) is provided with a through hole (1.1) and a second intersecting hole (1.3) intersecting with the through hole (1.1); A bearing (2) is arranged in the through hole (1.1), and the bearing (2) is provided with a connecting hole (2.2) opposite to the second cross hole (1.3); The second cross hole (1.3) is provided with an inwardly contracted blocking portion (1.33); A positioning pin (3), wherein a stop shoulder (3.21) extending outward is arranged on the periphery of the positioning pin (3); The head of the positioning pin (3) is inserted into the second cross hole (1.3) along the first direction to a preset position. At the preset position, the end face of the stop shoulder (3.21) abuts against the tail end face of the blocking portion (1.33) to limit the movement of the positioning pin (3) along the first direction. At the preset position, the main body of the positioning pin (3) fits into the second cross hole (1.3), and the head of the positioning pin (3) enters the connecting hole (2.2) to be matched and connected with the connecting hole (2.2).

2. The bearing assembly of a turbocharger according to claim 1, characterized in that: The second cross hole (1.3) comprises a second section (1.32) and a first section (1.31) arranged in sequence along the first direction, the aperture of the first section (1.31) is smaller than the aperture of the second section (1.32), and the end surface of the head portion forms the blocking portion (1.33) after the diameter of the second section (1.32) is enlarged; The positioning pin (3) comprises a clearance fitting section (3.1) arranged at a first end, and an interference fitting section (3.2) arranged at a second end; The diameter D (3.22) of the interference fit section (3.2) is greater than the diameter D (3.12) of the clearance fit section (3.1), Wherein, after the diameter of the interference fit section (3.2) is enlarged, the head end surface forms the stop shoulder (3.21).

3. The bearing assembly of a turbocharger according to claim 2, characterized in that: The clearance fitting section (3.1) is clearance-fitted with the connecting hole (2.2), and the diameter D (3.12) of the clearance fitting section (3.1) is smaller than the hole diameter of the first section (1.31) and the hole diameter of the second section (1.32), and the interference fitting section (3.2) is interference-fitted with the second section (1.32).

4. The bearing assembly of a turbocharger according to claim 3, characterized in that: The housing (1) is further provided with a first cross hole (1.2) intersecting with the through hole (1.1); the bearing (2) is provided with an oil hole (2.1) communicating with the first cross hole (1.2); the first cross hole (1.2) and the first section (1.31) and the second section (1.32) are arranged vertically along the same axis A.

5. The bearing assembly of a turbocharger according to claim 4, characterized in that: The diameter D (1.21) of the first cross hole (1.2) is smaller than or equal to the hole diameter of the first section (1.31).

6. The bearing assembly of a turbocharger according to claim 4, characterized in that: The axis A is perpendicular to the axis B of the through hole (1.1).

7. The bearing assembly of a turbocharger according to claim 2, characterized in that: The tail of the clearance fitting section (3.1) is provided with an annular groove.

8. The bearing assembly of a turbocharger according to claim 2, characterized in that: The tail opening of the first section (1.31) and the tail opening of the second section (1.32) are arranged with enlarged diameters.

9. The bearing assembly of a turbocharger according to claim 1, characterized in that: The housing (1) is provided with a lubricant channel (1.4), and the lubricant channel (1.4) is connected to the head of the first cross hole (1.2).

10. The bearing assembly of a turbocharger according to claim 2, characterized in that: The lower part of the housing (1) is provided with an assembly opening (1.5) at the tail portion corresponding to the second section (1.32).

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