CN206092074U - Connection structure of automotive turbosupercharger turbine and pivot - Google Patents

Abstract

The utility model discloses a connection structure of automotive turbosupercharger turbine and pivot, including pivot and turbine, be equipped with matched with convex part and blind hole on pivot and the turbine respectively, through the mutual fixed connection of screw thread, threaded connection's fastening direction is the same with the work rotation direction of turbine for the turbine has the self -locking ability with the connection structure of shaft, can avoid the get loose in the working process, keeps firm reliable connection. The screw thread both sides still are equipped with a set of guide way that can mutually support, and the guide way is interference fit, can guarantee that middle pivot keeps high to heart degree with the turbine on limited connection distance to the rotatory amount of unbalance of the whole rotor of help control maintains very low level. Because the utility model discloses a non - of blind hole runs through the design, has avoided to turbine structural strength's influence and the reliability problem who probably leads to.

Description

A kind of vehicle turbocharger turbine and the attachment structure of rotating shaft

Technical field

The utility model is related to vehicle turbocharger field, more particularly to a kind of vehicle turbocharger turbine and rotating shaft Attachment structure.

Background technology

Vehicle turbocharger agent structure generally comprises three parts, as shown in figure 1, including absorption high-temp waste gas energy Turbine 300 (including turbine, volute and runner, and subsidiary body), the intermediate bearing arrangement 200 of transmission energy are (including axle Hold stator, rotor, and cooling and lubricating mechanism) and compression fresh air compressor 100 (including pinch roller, pressure shell and runner, and Subsidiary body).The major function of wherein turbine is that guiding engine high-temperature exhaust air is efficient to be carried out expanding workmanship to drive Turbine rotates, and so that the exhaust energy of absorption is converted into into rotating mechanical energy, is transferred to compressor by rotating shaft and completes to fresh The compression of air inlet.One of core component of turbine is turbine, since it is desired that tolerance high-temperature exhaust air is (for gasoline exhaust temperature 1050 degrees Celsius may be up to) centrifugal force that causes of the thermal stress that causes and high rotating speed (highest can be more than 250,000 rpms), (engine exhaust includes nitrogen oxides, sulfide and other oxides etc., cooling additionally to need enough oxidation resistances Combine to form sour corrosion material with steam afterwards), it is therefore desirable to very high strength tolerates thsrmal-mech coupling, and chemically stable Property, good creep strength, thermal fatigue resistance and antioxygenic property, meets the design requirement of life-span and performance.Often now Material is the nickel-based superalloy of aviation grade, the typical trade mark such as Inco713 and MarM247.Correspondingly, it is middle Rotating shaft typically adopts high-strength die steel matter, can there is good machinability, and bears high-revolving ability.Turbine and Intermediate rotary shaft is typically linked together using welding manner, and it is real that current booster manufacturing has had highly developed technique It is existing, electron beam weldering or friction welding (FW) are typically include, can adapt to different design and use conditions.Fig. 2 show turbine with The welding connection structure of rotating shaft, including solder side 1, are the part of rotating shaft 2, generally steel matter, the portion on right side on the left of solder side 1 Position is turbine 3, generally nickel-base alloy material.The major defect of the turbine of nickel-base alloy material is that density is excessive, causes to rotate Inertia and quality are excessive, affect the transient state and steady-state behaviour of whole rotor assembly, cause turbocharger sluggish and other performances Problem, due to Engine Downsizing, it is desirable to power density it is increasing, speed at maximum torque require more and more lower, current whirlpool The problem that the rotary inertia and quality of wheel are excessive can be highlighted increasingly.

For this purpose, the lightweight of turbine material is a research direction, using more preferable aviation grade material, such as titanium-aluminium alloy It is a selection well to cast turbine.Its high mechanical properties, high-temperature resistant characteristic, and highly corrosion resistant ability can be good at Meet the use requirement of vehicle turbocharger, and its density declines about 40～50%, can greatly reduce turning for rotor Dynamic inertia, brings significant performance boost, particularly mapping to be lifted to turbocharger.But titanium-aluminum alloy turbine and steel The welding of material intermediate rotary shaft is always a technical barrier, and welding difficulty and cost are big, and it is raw that reliability cannot meet high-volume The demand of product.

Utility model content

In view of the deficiencies in the prior art, technical problem to be solved in the utility model be find it is a kind of substitute rotating shaft with The attachment structure that turbine is welded to connect.

For achieving the above object, the utility model replaces welding procedure using new screw connection structure, effectively connects Turbine and rotating shaft are connect, so as to avoid the difficulty in welding procedure, and some extra values and excellent also therefore can be brought Gesture.Specifically, the technical scheme that the utility model is provided is as follows：

A kind of attachment structure of vehicle turbocharger turbine and rotating shaft, attachment structure includes rotating shaft and turbine, rotating shaft and Turbine is threadably secured connection, and the fastening direction of screw thread is identical with the work rotation direction of turbine.

Preferably, one end of rotating shaft has convex portion, and turbine has the blind hole for accommodating convex portion, and convex portion and blind hole have respectively can The external screw thread for cooperating and internal thread.

Further, the groove that can accommodate piston ring is provided with rotating shaft.

Preferably, turbine has connecting portion, and connecting portion extends from the center of turbine to rotating shaft side, and blind hole is located at connecting portion In.

Further, the groove that can accommodate piston ring is provided with connecting portion.

Preferably, the internal thread both sides of blind hole and the external screw thread both sides of convex portion are additionally provided with the one group of guide part that can be cooperated Position, for making rotating shaft keep high concentricity with turbine, the one group of guiding position that can be cooperated adopts interference fit.

Preferably, interference fit is by the way of the point way of contact or stepwise manner or point contact are combined with staged.

Preferably, the section for putting convex portion in the way of contact is class polygon；The polygonal side number of class can be according to the straight of rotating shaft Footpath adjusts.

Preferably, the section of convex portion is class triangle or class quadrangle.

Preferably, turbine has convex portion, and convex portion extends from turbine center to rotating shaft side, and one end of rotating shaft has receiving convex The blind hole in portion, convex portion and blind hole have respectively external screw thread and the internal thread that can be cooperated.

Further, the internal thread both sides of blind hole and the external screw thread both sides of convex portion are additionally provided with the one group of guiding that can be cooperated Position, for making rotating shaft keep high concentricity with turbine, the one group of guiding position that can be cooperated adopts interference fit.

Preferably, interference fit is by the way of the point way of contact or stepwise manner or point contact are combined with staged.

Further, the groove that can accommodate piston ring is provided with rotating shaft.

The vehicle turbocharger turbine that the utility model is provided solves prior art in weldering with the attachment structure of rotating shaft The technical barrier for connecting, can reduce manufacturing cost using production technology is simplified in prior art designs, or apply in the conjunction of titanium aluminium In golden turbine applications, solve the problems, such as and steel rotating shaft welding difficulty is high.Compared with prior art, it is provided by the utility model Technology has advantages below：

1st, the utility model avoids welding by the way of threaded connection, it is ensured that it is also ensured that producing while quality Rate；

2nd, the utility model increases the pilot hole of interference fit before and after screw thread, it is ensured that rotating shaft and turbine are in less company Connect apart from interior holding alignment；

3rd, turbine of the present utility model and rotating shaft coordinates using the point way of contact, alignment has both been can guarantee that, while reducing Interference contact area, reduces frictional force, can reduce the difficulty installed；Contact area is reduced with the time point way of contact, just The heat that turbine is delivered in rotating shaft can be reduced；

4th, turbine of the present utility model and rotating shaft cooperation adopts stepwise manner, plays a part of dual guiding, it is ensured that Rotating shaft and turbine are in less connection apart from interior holding alignment；

5th, turbine of the present utility model coordinates by the way of point contact is combined with staged with rotating shaft, plays dual guiding While effect, it is ensured that alignment, Interference contact area is reduced, reduce frictional force, reduce the difficulty installed；

6th, the utility model is integrally designed using blind hole, it is to avoid the structural strength of turbine is had a negative impact；

7th, the utility model, because the technological process for welding increased can save, reduces whole production using threaded connection Cost and beat, save assembling process operation；

8th, the utility model can avoid ultrasound examination using threaded connection, simplify manufacturing process, improve production effect Rate；

9th, the utility model can save welding stress release process using threaded connection, simplify assembly process, improve Production efficiency；

10th, the utility model can loosen the qualification rate that product is improved to dynamically balanced requirement, drop using threaded connection Low production cost；

11st, using threaded connection, closure gasket groove can directly be processed the utility model in rotating shaft or turbine producer, and And the installation of sealing ring is carried out, can so save assembly process, improve production efficiency；

The technique effect of method of the present utility model and generation is described further below with reference to accompanying drawing, with fully Understand the purpose of this utility model, feature and effect.

Description of the drawings

Fig. 1 is the schematic diagram of vehicle turbocharger agent structure

Fig. 2 is vehicle turbocharger rotating shaft and turbine welding structure schematic diagram

Fig. 3 is the schematic diagram of the turbine with the first attachment structure of rotating shaft of embodiment of the present utility model 1

Fig. 4 is the schematic diagram of the turbine with second attachment structure of rotating shaft of embodiment of the present utility model 1

Fig. 5 is the schematic diagram of the turbine with the attachment structure of rotating shaft of embodiment of the present utility model 2

Fig. 6 is rotating shaft of the present utility model to be engaged the schematic diagram of mode with the point of turbine

Fig. 7 is the class triangular structure schematic diagram of the convex portion of rotating shaft of the present utility model

Fig. 8 is the class quadrilateral structure schematic diagram of the convex portion of rotating shaft of the present utility model

Fig. 9 is the schematic diagram of rotating shaft of the present utility model and the staged fit system of turbine

Figure 10 is the three-level stepped shape schematic diagram of the convex portion of rotating shaft of the present utility model

Specific embodiment

The vehicle turbocharger turbine that the utility model is provided is with the attachment structure of rotating shaft using double guide thread blind holes Attachment structure, replace welding procedure to connect titanium alloy turbine and steel shafts, avoid the technological difficulties of welding.

Embodiment 1

The vehicle turbocharger turbine of the present embodiment includes rotating shaft 10 and turbine 20, such as Fig. 3 with the attachment structure of rotating shaft It is shown.One end of rotating shaft 10 has convex portion 11, and on convex portion 11 external screw thread is provided with.Having on turbine 20 can be engaged with convex portion 11 Blind hole 21, is provided with internal thread in blind hole 21 so that turbine 20 can be threadably secured with rotating shaft 10 and be connected, threaded connection Fastening direction is identical with the work rotation direction of turbine so that the attachment structure of turbine and rotating shaft has self-locking ability, can be with Avoid releasing the connection for keeping solid and reliable in the course of work.The internal thread of blind hole 21 and the external screw thread both sides of convex portion 11 are also divided The one group of guiding position 22 that can be cooperated is not provided with, the one group of guiding position 22 that can be cooperated is arranged to interference and matches somebody with somebody Close, with certralizing ability, it is ensured that the rotating shaft in limited connection distance keeps high concentricity with turbine, whole so as to control The rotation amount of unbalance of rotor maintains extremely low level.In order that it is easy for installation, near the guiding of blind hole opening side Position diameter is somewhat larger, in case convex portion cannot be installed in blind hole during actual installation.Because the threaded connection of the present embodiment is tied Structure is designed using blind hole, can also avoid this attachment structure for the excessive impact of turbine structure intensity, it is ensured that reliability.

In order to further reduce impact of the blind hole to turbine structure intensity, the turbine 20 in the present embodiment can also turn close Axle side arranges raised connecting portion 23, as shown in Figure 4.The connecting portion 23 extends from the center of turbine 20 to the side of rotating shaft 10, In being located in intermediate 4 and heat shield 5.Blind hole 21 is arranged on connecting portion 23, is connected by screw thread with the convex portion 11 in rotating shaft 10 Connect fixation.Piston mounting groove and sealing structure can be preset on connecting portion 23.

Embodiment 2

The vehicle turbocharger turbine of the present embodiment includes rotating shaft 10 and turbine 20, such as Fig. 5 with the attachment structure of rotating shaft It is shown.The set-up mode of the present embodiment and embodiment 1 is conversely, be provided with blind hole 12, blind hole 12 is interior to be provided with interior spiral shell in rotating shaft 10 Line.And there is convex portion 24 on turbine 20, convex portion 24 is provided with external screw thread so that turbine 20 can be with the company of being threadably secured of rotating shaft 10 Connect, the fastening direction being now threadedly coupled is identical with the work rotation direction of turbine so that turbine has with the attachment structure of rotating shaft There is self-locking ability, can avoid releasing the connection for keeping solid and reliable in the course of work.The internal thread of blind hole 12 and convex portion 24 external screw thread both sides further respectively have the one group of guiding position 13 that can be cooperated, the one group of guiding position that can be cooperated 13 are arranged to interference fit, it is ensured that intermediate rotary shaft keeps high concentricity with turbine in limited connection distance, so as to Help controls the rotation amount of unbalance of whole rotor and maintains extremely low level.In order that it is easy for installation, open near blind hole The guiding position diameter of mouth side is somewhat larger, in case convex portion cannot be installed in blind hole during actual installation.

For the ease of installing, either using embodiment 1 or the connected mode of embodiment 2, convex portion and blind hole can be with Using contact or a stepped fit system, interference fit band is reduced while ensureing to be oriented to the positioning action at position with this The increase of the frictional force come.It is as shown in figs 6-8 the guide part site way of contact fit system of convex portion and blind hole, now convex portion Section be class polygonized structure, the convex portion in this preferred embodiment is maintained convex using class triangle and class quadrilateral structure The guiding position at least three point contact for being oriented to position and internal thread both sides in blind hole of external screw thread both sides in portion so that centre turns Axle keeps high concentricity with turbine.It is as shown in figs. 9-10 convex portion and the guiding position staged fit system of blind hole, now turns Three-level staged convex portion design on axle serves the effect of dual guiding, it is ensured that rotating shaft and turbine are in less connection distance Interior holding alignment.In other implementations, convex portion can also be combined using a way of contact with blind hole with stepwise manner Fit system, with further improve alignment while reduce interference fit bring frictional force increase problem.

Compared with the welding connecting mode of prior art, the thread connecting mode that the utility model is provided has many excellent Gesture.Using being welded to connect, necessarily cause the internal stress of welding position, this internal stress can be during the use of turbocharger Progressively discharge along with the temperature and rotation speed change of alternation, cause rotor balancing level progressively to deteriorate the noise so as to bring Problem even fails.So in welding procedure, the essential objective reality for needing to consider this Stress Release, so as to special The fabrication evaluation welding quality of door avoids defect, while needing to use suitable process dynamic flat as far as possible after the completion of welding Internal stress caused by release welding before weighing apparatus amendment.Using screw connection structure of the present utility model, it is to avoid the process of welding, obtain Fundamentally to avoid this problem, simplify detection and discharge the technological process of internal stress, accelerate productive temp and reduction Cost.

The Second Problem of welding stress release is, in the fabrication process, since it is considered that the progressively release of internal stress is led The deterioration of the rotor dynamic balancing of cause, is forced on new product with the manufacturer's standard for adding amount of unbalance processed of keeping under strict control to ensure product Limit not over the balance for allowing in whole life cycle.Using screw connection structure of the present utility model, it is to avoid welding Technique and its internal stresses release problem for necessarily bringing so that without the need for because it is contemplated that plus system of keeping under strict control problem so that manufacturing Requirement of balance in journey is reduced, and reduces manufacturing cost, including reducing the demand to manufacturing equipment, reduces production Cost.

Further, since without the need for prepackage between intermediate rotary shaft and turbine, such that it is able to supply different rotations simultaneously using same axle The turbine for turning direction is used (including clockwise and anticlockwise), and this has for product parts number, stock's number etc. is reduced Place.

Finally, will can be pre-machined in turbine (when using as shown in Figure 4 for the piston ring mounting groove of sealing hydrocarbons During connected mode) or rotating shaft on (when using the connected mode as shown in Fig. 3 or Fig. 5 when) because in the Welder of prior art During skill, it is contemplated that welding process necessarily causes deformation, so only after welding procedure, then individually do a piston ring groove Processing.According to thread connecting mode, then this flow process can be avoided, so as to accelerate productive temp and reduces cost.

Preferred embodiment of the present utility model described in detail above.It should be appreciated that the ordinary skill of this area without Need creative work just can make many modifications and variations according to design of the present utility model.Therefore, it is all in the art Technical staff on the basis of existing technology can by logical analysis, reasoning, or a limited experiment according to design of the present utility model With the technical scheme for obtaining, all should be in the protection domain being defined in the patent claims.

Claims (10)

1. the attachment structure of a kind of vehicle turbocharger turbine and rotating shaft, it is characterised in that the attachment structure includes rotating shaft And turbine, the rotating shaft and the turbine be threadably secured connection, the work of the fastening direction of the screw thread and the turbine Rotation direction is identical.

2. the attachment structure of vehicle turbocharger turbine as claimed in claim 1 and rotating shaft, wherein one end of the rotating shaft With convex portion, the turbine has the blind hole for accommodating the convex portion, and the convex portion and the blind hole have can cooperate respectively External screw thread and internal thread.

3. the attachment structure of vehicle turbocharger turbine as claimed in claim 2 and rotating shaft, wherein arranging in the rotating shaft Having can accommodate the groove of piston ring.

4. the attachment structure of vehicle turbocharger turbine as claimed in claim 2 and rotating shaft, wherein the turbine has connecting Socket part, the connecting portion extends from the center of the turbine to the rotating shaft side, and the blind hole is located in the connecting portion.

5. the attachment structure of vehicle turbocharger turbine as claimed in claim 4 and rotating shaft, wherein setting on the connecting portion Being equipped with can accommodate the groove of piston ring.

6. the attachment structure of the vehicle turbocharger turbine as described in claim 2 or 4 and rotating shaft, wherein the blind hole is interior The external screw thread both sides of screw thread both sides and the convex portion are additionally provided with the one group of gathering sill that can be cooperated, it is described cooperate one Group gathering sill adopts interference fit.

7. the attachment structure of vehicle turbocharger turbine as claimed in claim 1 and rotating shaft, wherein the turbine have it is convex Portion, the convex portion extends from the turbine center to the rotating shaft side, and one end of the rotating shaft has the receiving convex portion Blind hole, the convex portion and the blind hole have respectively external screw thread and the internal thread that can be cooperated.

8. the attachment structure of vehicle turbocharger turbine as claimed in claim 7 and rotating shaft, wherein the interior spiral shell of the blind hole The external screw thread both sides of line both sides and the convex portion are additionally provided with the one group of gathering sill that can be cooperated, a group for cooperating Gathering sill adopts interference fit.

9. the attachment structure of vehicle turbocharger turbine as claimed in claim 7 and rotating shaft, wherein arranging in the rotating shaft Having can accommodate the groove of piston ring.

10. the attachment structure of vehicle turbocharger turbine as claimed in claim 1 and rotating shaft, wherein the turbine is by titanium aluminium Alloy is made.