CN207647554U - A kind of booster shaft bearing structure - Google Patents

Abstract

The utility model describes a kind of booster shaft bearing structure, and the both ends of shaft are matched with pinch roller and turbine respectively, and the bearing at least end face is curved support face, and the shaft is equipped with and the matched groove of curved support.Since curved support face can resist turbine and the unequal axial thrust of pinch roller are come from suffered by bearing, by axial out-of-balance force decomposed to radial direction, radial load will not have a negative impact to bearing, rotor, so axial force is decomposed radial direction, the axial carrying capacity of bearing can be improved, then be conducive to the stability of rotor-support-foundation system, reduce low rate start mechanical loss, improve the low speed response of rotor.

Description

A kind of booster shaft bearing structure

Technical field

The utility model is related to the technical field of turbocharger more particularly to a kind of bearing arrangements for booster.

Background technology

Turbocharger is the device being used in combination with internal combustion engine, and engine charge is transported to for passing through compression Mouthful air mix with fuel and burning increases the power output of engine within the engine.Turbocharger includes peace Mounted in compressor impeller in compressor housing and the turbine in turbine cylinder.Wherein, turbine cylinder and compressor Shell is formed separately, and also has another middle casing to be connected between turbine cylinder and compressor housing, is used for bearing Installation and cooling and lubricating.Turbine cylinder limits the general toroidal runner for surrounding turbine, and turbine assembly includes that runner is logical To the nozzle in turbine.Exhaust flows to turbine from runner by the nozzle, and drives turbine rotation, and turbine drives coaxially connected Compressor rotation.Air is compressed by compressor impeller, is then connected to from housing outlets to engine intake.

During booster is run, the rotating speed of rotor-support-foundation system is very high, is far above 100,000 revs/min of rotating speed, has Small displacement supercharger rotor rotating speed even can reach 300,000 revs/min, and under this rotating speed, bearing will bear very big examine It tests, wherein abrasion is the failure mode for being easiest to occur.The reason of wearing mainly has two parts, first be lubricating oil not There is dry friction with rotor in foot, bearing, and second is that axial thrust is excessive, and bearing is caused dry friction occur with rotor；With starting Machine is higher and higher to booster performance requirement, and the axial thrust that TC bearings are born also gradually increases, and the increase of thrust is inevitable Bearing failure risk can be caused to increase.

In the prior art, processing generally is optimized to the structure of rotor bearing, than as shown in Figure 1 and Figure 2, bearing is one Body formula, bearing bears axial force and radial load, inside sets the bearing hole coordinated with armature spindle, both ends are respectively at turbine, spacer sleeve It matches.But the design has the disadvantage that：

1, it is limited by bearing space, bearing axial carrying face is smaller, and rotor is more than bearing axial carrying capacity in axial force When, bearing axial carrying is difficult to form dynamic pressure oil film on face, is susceptible to the dry friction of rotor and bearing, Bearing Grinding is caused to lose Effect.

2, bearing is divided into individual radial support face and axial support surface, and when running at high speed, friction loss is big.

Therefore, it is badly in need of wanting a kind of bearing that can effectively coordinate and shaft in the prior art, while avoids bearing and shaft It runs at high speed and avoids generating the Novel bearing structure of frictionally damage when coordinating.

Invention content

The purpose of this utility model is to provide a kind of booster shaft bearing structure, passes through the change to bearing support face so that Connected by arc surface between bearing and shaft so that axial out-of-balance force can be distributed to radial direction by bearing, improve bearing Bearing capacity so that rotor operation is more stable.

To achieve the goals above, the technical solution of the utility model is：A kind of booster shaft bearing structure, it includes mainly Shaft and with the matched bearing of shaft, it is characterised in that：The both ends of shaft are matched with pinch roller and turbine respectively, the axis It is curved support face to hold at least end face, and the shaft is equipped with and the matched groove of curved support.

Optionally, one end of the bearing is planar support surface, and the other end is curved support face.Or the bearing Two end faces are curved support face.

Preferably, the curved support face is smoothly connected by planar section and side plate bending, the groove include with The corresponding flat bottomed recess of planar section, and with the matched arc groove of side plate bending, the arc groove and side plate bending it Between there are gaps.

Further, the curved support face includes at least one cambered surface, and the groove is arc corresponding with cambered surface Groove.

Further, the curved support face is smoothly connected by the first cambered surface and the second cambered surface, the groove By the first arc groove corresponding with the first cambered surface, and be smoothly connected with matched second arc groove of the second cambered surface and At there are gaps between first, second arc groove and curved support face.

Compared with the existing technology, the technical solution of the utility model further includes many in addition to the improvement of overall technical architecture Improvement in terms of details, specifically, having the advantages that：

1, one end of improvement project described in the utility model, the bearing is planar support surface, and the other end is arc Supporting surface, curved support face can resist and come from turbine and the unequal axial thrust of pinch roller suffered by bearing, will axially not Equilibrant force decomposed is to radial direction, and radial load will not have a negative impact to bearing, rotor, so axial force is decomposed diameter To the axial carrying capacity of bearing can be improved；

2, the structure of single cambered surface or plane+cambered surface may be used in the curved support end of the technical solution of the utility model, Rotor bearing arrangement equipped with the contact of axial cambered surface can change with external force and adjust axial loading end, be conducive to rotor-support-foundation system Stability, reduce low rate start mechanical loss, improve the low speed response of rotor；

3, double globoidal structures may be used in the curved support end of the utility model, i.e. two cambered surfaces are spliced, in shaft Equipped with groove corresponding with the curved support end, there are gap between groove and curved support end, this allows for bearing can be with By out-of-balance force decomposed to radial direction, the abrasion between bearing and shaft is reduced, the service life of parts is improved, carries simultaneously The high transient response of shaft, to improve the transient response ability of booster.

Description of the drawings

Fig. 1 is the bearing of the prior art and the structural schematic diagram of shaft.

Fig. 2 is the structural schematic diagram of prior art middle (center) bearing.

Fig. 3 is the schematic cross-sectional view of bearing described in the utility model and shaft.

Fig. 4 is that enlarged cross-sectional view cuts open in the office of bearing described in the utility model and shaft.

Reference numeral：

1 bearing, 2 shafts, 3 pinch rollers, 4 turbines；

11 planar support surfaces, 12 curved support faces, 13 planar sections, 14 side plate bendings.

Specific implementation mode

The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally The every other embodiment that field those of ordinary skill is obtained without making creative work, belongs to this practicality Novel protected range.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be directly connected, can also can be indirectly connected through an intermediary the connection inside two elements.For For those skilled in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.

The utility model provides a kind of booster shaft bearing structure, and with reference in figure 3,4, it includes mainly shaft and and shaft The both ends of matched bearing, shaft are matched with pinch roller and turbine respectively, and one end of the bearing is planar support surface, separately One end is curved support face, and the shaft is equipped with and the matched groove of curved support.Since turbocharger is being run Period, turbine and the axial thrust that pinch roller is subject to are unequal, so must have bearing resists the part out-of-balance force.Due to wheel The rotating speed of son is very high, some products can reach 300,000 revs/min, and under the rotating speed, bearing cannot directly connect with rotor It touches, the generation wear out failure that otherwise bearing and rotor can be very fast.Currently, between being designed between bearing and rotor centainly Gap, lubricating oil is full of between gap, and rotor forms dynamic pressure oil film when rotating, bears axial force and radial load, prevent two metals Contact generates dry friction between parts.But since current booster performance is higher and higher, the axial imbalance of two wheels Power is also increasing, i.e., the axial load that bearing is born is bigger, and is limited by bearing arrangement, axial carrying area be it is limited, The load that oil film is born is limited, so, when bearing out-of-balance force, which reaches certain value, to be obtained, it is difficult between bearing and rotor Dynamic pressure oil film is formed, dry friction is easy tod produce, gently then leads to bearing, rotor abrasion, it is heavy then lead to entire booster failure.

But since bearing one end of this programme is plane, the other end is curved support face, utilizes this arc branch of bearing Cooperation between the shaft of support face so that bearing can decompose this out-of-balance force again when by both ends out-of-balance force, The out-of-balance force being axially subject to is decomposed into radial direction, and radial load will not have a negative impact to bearing, shaft, therefore, Axial force is decomposed into radial direction, it is ensured that the dynamic pressure oil film between bearing and shaft will not fail, and can improve the axis of bearing To bearing capacity.

In one embodiment, in the technical solution of this patent, the both ends of bearing are curved support face, arc here Supporting surface is smoothly connected by planar section and side plate bending, and such curved support face coordinates stablizing effect with planar section, Radial effect can be turned to from axial by carrying side plate bending strength again.

Meanwhile the groove includes flat bottomed recess corresponding with planar section, and with the matched arc of side plate bending Groove, there are gaps between the arc groove and side plate bending.Here gap passes through the profit of setting for filling lubricating oil Lubricating oil so that shaft forms dynamic pressure oil film between bearing when rotated, and dynamic pressure oil film allows bearing preferably to bear to come From power axially and radially, prevent from contacting to form dry friction between the two metal parts of shaft and bearing.Work as arc groove When carrying out forced contact with side plate bending, as external force variation can adjust the axial carrying face of bearing, when the axially loaded of bearing When excessive, can it be transformed into radial direction arcwall face is forced through automatically, this is also further conducive to the stability of rotor-support-foundation system, reduces Low rate start mechanical loss improves the low speed response of rotor.

In another embodiment, curved support face can be a single arcwall face, can also be by multiple arcs The arcwall face that face is put together, curved support face and is located between the arc groove in shaft and is necessarily present gap, and gap is then To fill lubricating oil.

Concrete example illustrates that curved support face is smoothly connected by the first cambered surface and the second cambered surface, the groove By the first arc groove corresponding with the first cambered surface, and be smoothly connected with matched second arc groove of the second cambered surface and At there are gaps between first, second arc groove and curved support face.Since bearing using curved end and turns here Axis is coordinated, then bearing no matter how stress, can remain that the dynamic pressure oil film between bearing and shaft is effective, this is just The frictional force between bearing and shaft is reduced, the abrasion between bearing and shaft is reduced, improves part life and supercharging Device efficiency is conducive to the stability of rotor-support-foundation system, reduces low rate start mechanical loss, improves the low speed response of rotor.

Specific embodiment of the utility model is described in detail above, but it is intended only as example, this practicality is new Type is not restricted to particular embodiments described above.To those skilled in the art, any that the utility model is carried out Equivalent modifications and substitute also all among the scope of the utility model.Therefore, in the spirit and model for not departing from the utility model Impartial conversion and modification made by under enclosing, should all cover in the scope of the utility model.

Claims (6)

1. a kind of booster shaft bearing structure, it include mainly shaft and with the matched bearing of shaft, it is characterised in that：Shaft Both ends are matched with pinch roller and turbine respectively, and the bearing at least end face is curved support face, is set in the shaft Have and the matched groove of curved support.

2. a kind of booster shaft bearing structure according to claim 1, it is characterised in that：One end of the bearing is plane Supporting surface, the other end are curved support face.

3. a kind of booster shaft bearing structure according to claim 1, it is characterised in that：Described two end faces of bearing are Curved support face.

4. a kind of booster shaft bearing structure according to claim 2 or 3, it is characterised in that：The curved support face by Planar section and side plate bending are smoothly connected, and the groove includes flat bottomed recess corresponding with planar section, and and cambered surface The matched arc groove of section, there are gaps between the arc groove and side plate bending.

5. a kind of booster shaft bearing structure according to claim 2 or 3, it is characterised in that：The curved support bread At least one cambered surface is included, the groove is arc groove corresponding with cambered surface.

6. a kind of booster shaft bearing structure according to claim 5, it is characterised in that：The curved support face is by first Cambered surface and the second cambered surface are smoothly connected, and the groove is by the first arc groove corresponding with the first cambered surface, Yi Jiyu Matched second arc groove of second cambered surface is smoothly connected, first, second arc groove and curved support face Between there are gaps.