CN104747597A

CN104747597A - Floating bearing of small type turbocharger

Info

Publication number: CN104747597A
Application number: CN201310745005.2A
Authority: CN
Inventors: 唐云冰; 何进; 包晓虹
Original assignee: CHANGZHOU E&E TURBO-POWER Co Ltd
Current assignee: CHANGZHOU E&E TURBO-POWER Co Ltd
Priority date: 2013-12-30
Filing date: 2013-12-30
Publication date: 2015-07-01

Abstract

The invention belongs to the field of turbochargers, and particularly relates to a floating bearing of a small type turbocharger. The floating bearing comprises a turbine and a pressing wheel. The turbine and the pressing wheel are connected through a rotating shaft and a middle body, and the rotating shaft is provided with the floating bearing; the floating bearing is fixed to the middle body through a locating pin; and one end of the floating bearing abuts against the end face of the turbine, and the other end of the floating bearing abuts against the end face of the pressing wheel through a shaft seal. An oil tank, a plane and an oil wedge face are arranged on the end face of the floating bearing; and the oil wedge face and the plane are inclined faces in the circumferential direction, and are inclined faces with the outer edges higher than the inner edges in the radial direction. The floating bearing has the advantages that through a semi-floating bearing, the number of parts is reduced, a structure is simplified, the length of a rotor and the length of a supercharger are reduced, the material cost is reduced, a machine core structure is simple, compact, and low in cost, and the floating bearing is quite suitable for a low-emission gasoline engine supercharger

Description

The floating bearing of small sized turbocharger

Technical field

The invention belongs to field of turbochargers, specifically a kind of floating bearing of small sized turbocharger.

Background technique

Because municipal pollution and noise nuisance are more and more serious, various countries' environmental legislation controls more and more stricter, facilitates the development of the petrol engine such as minibus and passenger car turbocharging technology.The developing history of petrol engine air admission supercharging technology similar existing over half a century, but its development but experienced by a very long road.Main cause is exactly that diesel engine and petrol engine work characteristics separately exist very big difference, particularly in the formation and combustion manner of mixed gas, has great impact to boost performance, makes petrol engine air admission supercharging more a lot of than diesel engine supercharging difficulty technically.For petrol engine, improve the temperature and pressure of mixed gas compression and combustion gas in cylinder after supercharging, add the heat load of firing chamber Heating Components, be easy to produce pinking, thus the mechanical property of motor, greasy property etc. are all affected.Petrol engine delivery temperature is higher than diesel engine in addition, and the rotating ratio diesel engine of petrol engine is high, and air mass flow change is larger.These are all had higher requirement to the material of turbocharger for gasoline engine and parts thereof, design, manufacture and processing.

Existing turbosupercharger, its basic structure is as above shown in Fig. 1, and its bearing arrangement is biserial full-floating type, namely respectively has a floating bearing at whirlpool end and pressure side, and when rotor high-speed rotates, bearing is also with comparatively low speed rotation, common floating bearing end face has 8 oil film wedge faces and oil groove, limit, two, oil film wedge face is parallel, and the oil film wedge degree of depth only changes at circumferencial direction, and its structure as shown in Figure 2 and Figure 3, the oil film wedge of bearing face only can form oil film wedge bearing capacity in one direction when forming squeeze film, and bearing capacity is less, in booster lubricating system chargeoil from motor main oil gallery pass on lubrication pressurized machine, in order to give full play to the function of high-speed bearing, all should with careful consideration to each several part of lubricating oil oil circuit, carefully design the Each part of oil circuit, in addition, because motor is when high load operating mode operates, turbine and turbine box are all in the high temperature of 600 ~ 750 DEG C, so its heat transfer will be cut off, below specified value is remained on to make the temperature at the positions such as bearing, here the cooling action of lubricating oil is very important, the lubricating oil entering pressurized machine in general turbosupercharger generally distributes to 2 directions: radial bearing, thrust bearing, so the lubricating system of floating bearing in general pressurized machine divides radial oil-feed and axial fuel inlet two kinds.

Summary of the invention

The problem to be solved in the present invention is to provide a kind of floating bearing of small sized turbocharger of semifloating bearing.

The invention provides following technological scheme:

The floating bearing of small sized turbocharger, the end face of floating bearing is provided with oil groove, plane and oil film wedge face, and described oil film wedge face and plane circumference are inclined-plane, and radial direction is the inclined-plane of outer rim higher than inner edge.

Described floating bearing side face is provided with the radial oil groove of left end radial oil groove, left axial oil groove, middle axial oil groove, right axial oil groove and right-hand member, intermediate is provided with axial fuel inlet road, left radial in-line and right radial in-line, the radial oil groove of left end is led in the outlet of left radial in-line, the radial oil groove of right-hand member is led in the outlet of right radial in-line, and axial fuel inlet road is communicated with left axial oil groove, middle axial oil groove, right axial oil groove.

The material of described floating bearing comprises the Zn that mass fraction is 29%-31%, and surplus is Cu.

Advantage of the present invention is reduced the number of part, simplified structure, shorten rotor length and pressurized machine length, reducing cost of material, realize cheapization of simple, compactness, the cost of core structure, be very applicable to small-displacement gasoline engine supercharger.

Accompanying drawing explanation

Fig. 1 is existing turbocharger arrangement schematic diagram;

Fig. 2 is the structural representation of the radial oil-feed of existing turbosupercharger;

Fig. 3 is the structural representation of the axial oil-feed of existing turbosupercharger;

Fig. 4 is structural representation of the present invention;

Fig. 5 is floating bearing structural representation;

Fig. 6 is the side view of floating bearing;

Fig. 7 is the partial view of Fig. 6;

Fig. 8 is the A-A direction view of Fig. 6.

Embodiment

As shown in Figure 4, small sized turbocharger it comprise turbine 1 and pinch roller 2, be connected by rotating shaft 3 and intermediate 4 between turbine 1 with pinch roller 2, described rotating shaft 3 is provided with floating bearing 5, floating bearing 5 is fixed on intermediate 4 by locating stud 7, floating bearing 5 one end props up the end face of turbine 1, the other end props up the end face of pinch roller 2 by shaft seal 6, the end face of floating bearing 5 is provided with oil groove 5a, plane 5b and oil film wedge face 5c, described oil film wedge face 5c circumference is inclined-plane, radial direction is the inclined-plane of outer rim higher than inner edge, by only having a floating bearing 5 in movement, and floating bearing cannot rotate in rotor turns process, floating bearing is at the two-layer oil film of inside and outside formation, the end face of floating bearing is as a thrust bearing part, rotor bearing face when High Rotation Speed will be subject to certain axial force, and produce friction.

As shown in Fig. 5 and Fig. 6, Fig. 7, floating bearing end face is provided with oil groove, plane and oil film wedge face, generally be provided with eight oil film wedge faces and oil groove, oil film wedge face is fan-shaped, the circumference wedge surface that oils is inclined-plane, this inclined-plane, as the inclined-plane a in Fig. 8, the radial direction in oil film wedge face is set to raised inclined-plane from inside to outside, be oil film wedge face diameter to outer rim higher than inner edge; Plane is also in fan-shaped, and the circumference wedge surface that oils is inclined-plane, and radial direction is set to raised inclined-plane from inside to outside, be oil film wedge face diameter to outer rim higher than inner edge; Floating bearing oil film wedge face and plane are all vicissitudinous inclined-plane in fan-shaped diametric(al), fan-shaped oil film wedge face oil film loaded area is large, oil film path length, than the parallel oil film wedge face bearing power increase 60% of prior art, so just to meet in core structure using the end face of floating bearing as thrust bearing to carry the demand of axial force, thus realize cheapization of simple, compactness, the cost of core structure.

As shown in Figure 5, floating bearing 5 side face is provided with the radial oil groove 5A of left end, left axial oil groove 5C, middle axial oil groove 5E, right axial oil groove 5D and the radial oil groove 5B of right-hand member, intermediate is provided with axial fuel inlet road C, left radial in-line A and right radial in-line B, the radial oil groove 5A of left end is led in the outlet of left radial in-line A, the radial oil groove 5B of right-hand member is led in the outlet of right radial in-line B, axial fuel inlet road C and left axial oil groove 5C, middle axial oil groove 5E, right axial oil groove 5D is communicated with, radial oil inlet hole D is equipped with in the radial oil groove of left end and the radial oil groove of right-hand member, radial oil-feed and axial fuel inlet can be realized simultaneously, make floating bearing inwall and outer circumferential face to be formed inside and outside two-layer oil film, reduce oil film vibration, improve the run stability of rotor.

For improving the intensity of floating bearing and load-carrying properties, what the material of floating bearing adopted is sinterred brass material, mainly adopts H70 alloy powder Zn mass fraction to be 29% ~ 31%, and surplus is Cu, adds a small amount of intensified element, reactive compound and forming agent.

Claims

1. the floating bearing of small sized turbocharger, is characterized in that: the end face of floating bearing is provided with oil groove, plane and oil film wedge face, and described oil film wedge face and plane circumference are inclined-plane, and radial direction is the inclined-plane of outer rim higher than inner edge.

2. the floating bearing of small sized turbocharger according to claim 1, it is characterized in that: described floating bearing side face is provided with the radial oil groove of left end radial oil groove, left axial oil groove, middle axial oil groove, right axial oil groove and right-hand member, intermediate is provided with axial fuel inlet road, left radial in-line and right radial in-line, the radial oil groove of left end is led in the outlet of left radial in-line, the radial oil groove of right-hand member is led in the outlet of right radial in-line, and axial fuel inlet road is communicated with left axial oil groove, middle axial oil groove, right axial oil groove.

3. the floating bearing of small sized turbocharger according to claim 1 and 2, is characterized in that: the material of described floating bearing comprises the Zn that mass fraction is 29%-31%, and surplus is Cu.