CN210153085U

CN210153085U - Thrust bearing device of turbocharger

Info

Publication number: CN210153085U
Application number: CN201920824387.0U
Authority: CN
Inventors: 陆圯; 田亮; 詹姆斯·凯利
Original assignee: Wuxi Cummins Turbo Technologies Co Ltd
Current assignee: Wuxi Cummins Turbo Technologies Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-03-17
Anticipated expiration: 2029-06-03

Abstract

The utility model belongs to the technical field of turbochargers, and relates to a thrust bearing device of a turbocharger, which comprises a thrust bearing arranged on a supercharger middle shell, wherein thrust surfaces are respectively formed on the two axial sides of the thrust bearing; a first thrust ring and a second thrust ring are respectively arranged on the rotating shaft of the supercharger middle shell corresponding to the two axial ends of the thrust bearing, the first thrust ring and the second thrust ring are respectively in sliding contact with corresponding thrust surfaces, and the first thrust ring and the second thrust ring and the rotating shaft synchronously rotate; thrust surface of thrust bearing is separated into a plurality of sectorial parts by a plurality of oil grooves, and every sectorial part all is including the oil wedge face portion and the plane portion that meet, and thrust bearing sets up the oil scraper ring, and the oil scraper ring is arranged in to the sectorial part. The utility model discloses a control keeps off oily width to combine the setting of radial difference in height, thereby on restraining the basis that the machine oil flow improves oil film thickness and footstep bearing capacity, reduce mechanical loss, and effectively control the lubricating oil temperature under the high thrust operating mode and promote.

Description

Thrust bearing device of turbocharger

Technical Field

The utility model belongs to the technical field of turbo charger, a turbo charger thrust bearing device is related to.

Background

The thrust bearing takes on the role of carrying the axial thrust during operation of the turbocharger. In general, a thrust bearing of the supercharger adopts a wedge-shaped surface structure, and forms an oil film gap together with thrust ring surfaces fixed on a rotating shaft of the supercharger on two sides of the bearing, so that the thrust is achieved under the action of a lubricating oil film. During operation of the supercharger, particularly during high speed rotation, the lubricating oil supplied to the thrust bearing flows along the rotating thrust ring surface and flows radially outward under the action of centrifugal force.

Patent document US6024495 describes that an oil retainer ring having a radial groove communicating with the outside of the bearing at a position corresponding to an oil groove is provided on the outer peripheral side of the thrust surface of the thrust bearing so as to be higher than the wedge surface, thereby reducing the radial outflow of the lubricating oil.

Patent document US7470064B2 describes that on the basis of the slinger plus radial groove design disclosed in US6024495, the wedge-shaped surface of the thrust bearing is gradually raised from inside to outside along the radial position, so that under the condition that the height of the wedge-shaped surface on the inner circumferential side is not changed, the height of the contact position between the outer circumferential side and the slinger is flush with the slinger, so as to improve the problem that the gap is suddenly reduced at the position close to the slinger, the stress and the mechanical loss are increased, and the lubricating oil temperature is overhigh under the high-thrust working condition, and finally the system fails.

Disclosure of Invention

The utility model provides a to above-mentioned problem, a turbo charger thrust bearing device is provided, thereby this thrust bearing device reduces mechanical loss simultaneously on inhibiting the basis that the machine oil flow improves oil film thickness and thrust bearing capacity to the lubricating oil temperature under the high thrust operating mode of effective control promotes, avoids becoming invalid.

According to the technical scheme of the utility model: a turbocharger thrust bearing device characterized by: the thrust bearing comprises a thrust bearing arranged on a middle shell of the supercharger, wherein thrust surfaces are respectively formed on two axial sides of the thrust bearing; a rotating shaft of the supercharger middle shell is provided with a first thrust ring and a second thrust ring corresponding to the two axial ends of the thrust bearing respectively, the first thrust ring and the second thrust ring are in sliding contact with corresponding thrust surfaces respectively, and the first thrust ring and the second thrust ring and the rotating shaft rotate synchronously; the thrust surface of the thrust bearing is divided into a plurality of fan-shaped parts by a plurality of radially extending oil grooves, each fan-shaped part comprises an oil wedge surface part and a plane part which are connected, an oil retainer ring is arranged on the thrust surface on at least one side of the thrust bearing, and the fan-shaped parts are arranged in the oil retainer ring.

As a further improvement of the utility model, the booster middle shell is provided with an oil way for providing lubricating oil for the thrust bearing.

As a further improvement of the present invention, the thrust bearing is formed by sequentially decreasing the axial length of the surface of the sector formed at least at the thrust surface provided with the slinger from the inside to the outside in the radial direction to form an inclined wedge surface.

As the utility model discloses a further improvement, the inner wall alignment of the radial outer end plane of plane portion and oil slinger meets, and the department of meeting of oil slinger and oil wedge face portion forms the step.

As a further improvement, the two thrust surfaces of the thrust bearing are provided with oil slingers.

As a further improvement of the present invention, a sliding contact surface is formed between the slinger and the first thrust ring or the second thrust ring.

As a further improvement of the utility model, the radial width of the sliding contact surface is not more than 2 mm.

The technical effects of the utility model reside in that: the utility model provides a footstep bearing technical scheme keeps off the oil width through control to combine the setting of radial difference in height, thereby on inhibiting the basis that the machine oil flow improves oil film thickness and footstep bearing capacity, reduce mechanical loss, and effectively control the lubricating oil temperature under the high thrust operating mode and promote, improve product reliability.

Drawings

Fig. 1 is a schematic structural view of a thrust bearing device according to the present invention.

Fig. 2 is a schematic view of a thrust surface structure of the thrust stopping bearing of fig. 1.

Fig. 3 is a schematic view of a part of the cross section of the parallel state of the rotor in fig. 2 along the line a-a' and the position of the thrust ring.

FIG. 4 is a schematic cross-sectional view of the rotor of FIG. 2 taken along line A-A' and showing the position of the thrust ring relative thereto.

Fig. 5 is a schematic view of a part of the cross section of the parallel state of the rotor in fig. 2 along the line B-B' and the position of the thrust ring.

FIG. 6 is a schematic cross-sectional view of the rotor of FIG. 2 taken along the line B-B' and showing the position of the thrust ring relative thereto.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 to 6 include a thrust bearing 1, a supercharger intermediate housing 2, a first thrust collar 3, a second thrust collar 4, an oil passage 5, a rotary shaft 6, a flat surface portion 7, an oil wedge surface portion 8, an oil groove 9, an oil slinger 10, a sliding contact surface 11, and the like.

As shown in fig. 1 to 6, the present invention relates to a thrust bearing device for a turbocharger, which comprises a thrust bearing 1 mounted on a supercharger middle shell 2, wherein thrust surfaces are respectively formed on two axial sides of the thrust bearing 1; a rotating shaft 6 of the supercharger middle shell 2 is provided with a first thrust ring 3 and a second thrust ring 4 corresponding to the two axial ends of the thrust bearing 1, the first thrust ring 3 and the second thrust ring 4 are in sliding contact with corresponding thrust surfaces, and the first thrust ring 3 and the second thrust ring 4 rotate synchronously with the rotating shaft 6; the thrust surface of the thrust bearing 1 is divided into a plurality of fan-shaped parts by a plurality of radially extending oil grooves 9, each fan-shaped part comprises an oil wedge surface part 8 and a plane part 7 which are connected, at least one side thrust surface of the thrust bearing 1 is provided with an oil scraper ring 10, and the fan-shaped parts are arranged in the oil scraper ring 10.

An oil passage 5 is provided in the supercharger intermediate housing 2 to supply lubricating oil to the thrust bearing 1.

The thrust bearing 1 is formed with a tapered surface in which the axial length of a sector formed by at least the thrust surface provided with the slinger 10 decreases in the radial direction from the inside to the outside.

The plane of the radially outer end of the flat portion 7 is aligned with the inner wall of the slinger 10, and the joint of the slinger 10 and the oil wedge face portion 8 forms a step, it being understood that the surface of the slinger 10 is higher than the surface where the oil wedge face portion 8 is joined.

Both thrust surfaces of the thrust bearing 1 are provided with slingers 10, and it is understood that when both thrust surfaces of the thrust bearing 1 are provided with slingers 10, the radial positions of both slingers 10 may be different.

The slinger 10 forms a sliding contact surface 11 with the first thrust ring 3 or the second thrust ring 4. The slinger 10 is of a 360-degree structure.

Research shows that the width of a sliding contact surface between the oil scraper ring and the corresponding thrust ring, hereinafter, the radial single-side width of the contact surface is called as the oil baffle width, and is a key parameter for realizing the required function. Under the condition that the size of the oil slinger 10 is fixed, when the oil slinger width is increased from zero, the outflow of lubricating oil is inhibited, the whole pressure distribution is improved, and the effective thrust area of the wedge-shaped surface is increased, so that the bearing capacity and the mechanical efficiency of the thrust bearing system are both obviously improved. However, after the oil blocking width is increased to a certain extent, the thrust system load capacity and mechanical efficiency are instead reduced due to the relative loss of area of the oil wedge surface portion 8, and the oil blocking width of 2mm or more does not substantially bring about an increase in load capacity in the size class of a typical supercharger thrust bearing. For this reason, the radial width of the sliding contact surface 11 does not exceed 2 mm.

On the other hand, in order to control the temperature rise of the local oil film of the temperature lubricating oil, the oil blocking width is limited within an effective range, and the height of a sector surface of the thrust bearing 1 is properly reduced from inside to outside along the radial direction, so that the relative running clearance between the oil blocking ring and the thrust collar is ensured, the oil blocking function and the product safety requirement can be balanced, and the inclusiveness of the thrust system to the severe working condition is further improved. In addition, due to the existence of the radial height difference, the outer clearance is increased, a radial groove is not needed on the oil slinger 10, and the processing cost is reduced.

As shown in fig. 3 and 4, in the parallel state of the rotor, the clearance gradually increases from the inner diameter (a ', B' side) to the outer diameter (A, B side) of the thrust bearing structure defined in the above embodiment, thereby preventing the problem that the clearance between the

first thrust ring

3 or 4 and the outer slinger 10 is too small in the inclined state of the rotor, which causes the local temperature to be too high, and the oil film to break or even fail. Further, in the process shown in fig. 4, the section from the oil wedge surface portion 8 to the slinger 10 shows that the gap increases towards the outer diameter direction until the position of the slinger 10 decreases again, the pressure distribution on the whole oil wedge surface is balanced from the inner side and the outer side together, the effective bearing area is increased, the bearing capacity of the thrust system under the condition of the same gap is improved, and the mechanical loss is reduced.

The utility model discloses the product can effectively satisfy the high-speed high-load's of booster application demand, relatively with prior art, can realize footstep bearing higher bearing capacity under equal space and cost control to can satisfy reliability and other performance demands.

Claims

1. A turbocharger thrust bearing device characterized by: the thrust bearing comprises a thrust bearing (1) arranged on a supercharger middle shell (2), wherein thrust surfaces are respectively formed on two axial sides of the thrust bearing (1); a rotating shaft (6) of the supercharger middle shell (2) is provided with a first thrust ring (3) and a second thrust ring (4) corresponding to the two axial ends of the thrust bearing (1), the first thrust ring (3) and the second thrust ring (4) are in sliding contact with corresponding thrust surfaces, and the first thrust ring (3) and the second thrust ring (4) rotate synchronously with the rotating shaft (6); the thrust surface of the thrust bearing (1) is divided into a plurality of fan-shaped parts by a plurality of radially extending oil grooves (9), each fan-shaped part comprises an oil wedge surface part (8) and a plane part (7) which are connected, at least one side thrust surface of the thrust bearing (1) is provided with an oil scraper ring (10), and the fan-shaped parts are arranged in the oil scraper ring (10).

2. The turbocharger thrust bearing device of claim 1, wherein: an oil passage (5) is arranged on the supercharger middle shell (2) to provide lubricating oil for the thrust bearing (1).

3. The turbocharger thrust bearing device of claim 1, wherein: the thrust bearing (1) is at least arranged on the surface of a sector part formed by a thrust surface of the oil retainer ring (10) and the axial length of the sector part is gradually reduced from inside to outside along the radial direction to form an inclined wedge-shaped surface.

4. The turbocharger thrust bearing device of claim 3, wherein: the plane of the radial outer end of the plane part (7) is aligned and connected with the inner wall of the oil retainer ring (10), and the connecting part of the oil retainer ring (10) and the oil wedge surface part (8) forms a step.

5. The turbocharger thrust bearing device of claim 1, wherein: two thrust surfaces of the thrust bearing (1) are provided with oil slingers (10).

6. The turbocharger thrust bearing device of claim 1, wherein: the slinger (10) and the first thrust ring (3) or the second thrust ring (4) form a sliding contact surface (11).

7. The turbocharger thrust bearing device of claim 5, wherein: the radial width of the sliding contact surface (11) is not more than 2 mm.