JP2008525630A5

JP2008525630A5 -

Info

Publication number: JP2008525630A5
Application number: JP2007547154A
Authority: JP
Filing date: 2005-08-17
Publication date: 2008-08-28
Anticipated expiration: 2025-08-17

Description

欧州特許出願公開第１３９４３６４号明細書から、２つのベーン支承リングを備えるターボチャージャが公知である。製作コストを減じることができるように、少なくとも一方のベーン支承リングは、その面周方向にわたって分配され一体的に成形されたスペーサを有する。これらのスペーサにより、両ベーン支承リングの軸方向の間隔は確保可能である。
欧州特許出願公開第１３９６６２０号明細書から、ベーン支承リングを備える別のターボチャージャが公知である。
最近の高出力エンジンにおいて、耐久的に機能を果たし得るベーン支承リングには、極めて高い材料要求が課される。相応に適した材料は、十分なクリープ抵抗、高温時でもベーン支承リングの熱的なひずみを回避する高い寸法安定性、高い耐摩耗性ならびに十分な耐酸化性を有していなければならない。上位概念部に記載した形式のベーン支承リングのひずみ、クリープまたは強い酸化が生じると、タービンガイドベーンのロック、つまり固着に至り得る。すなわち、ターボチャージャ横断面はもはやガイドベーン調節によりエンジンの運転状態に適合され得ない。 From European Patent Application No. 1394364, a turbocharger with two vane bearing rings is known. In order to reduce manufacturing costs, at least one of the vane bearing rings has a spacer that is distributed and integrally molded over the circumferential direction of the surface. With these spacers, it is possible to ensure the axial distance between the two vane support rings.
From EP 1396620 another turbocharger with a vane bearing ring is known.
In modern high power engines, extremely high material requirements are imposed on vane bearing rings that can perform durablely. A correspondingly suitable material must have sufficient creep resistance, high dimensional stability to avoid thermal distortion of the vane bearing ring even at high temperatures, high wear resistance and sufficient oxidation resistance. Strain, creep or strong oxidation of the vane bearing ring of the type described in the superordinate concept may lead to turbine guide vane locking, i.e., sticking. That is, the turbocharger cross-section can no longer be adapted to the engine operating conditions by adjusting the guide vanes.

Claims

A vane bearing ring of a turbocharger having a variable turbine geometry for an automotive internal combustion engine, the turbocharger having a turbine vane adjustable in the vane bearing ring for the variable turbine geometry, the vane In the type in which the bearing ring is made of an austenitic iron matrix alloy having a sulfur component to achieve a solid lubricant action on the bearing surface, tungsten (W), cobalt (Co), niobium (Nb ), Rhenium (Re), molybdenum (Mo), tantalum (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr) and / or an equivalent refractory alloy element. Turbocharge of an internal combustion engine characterized by having 1 to 6% by mass of an alloy element Vane bearing ring of.

Next alloy composition C = 0.4 to 0.6 having individual alloying elements, each expressed in mass%
Cr = 18-27
Nb = 1.4-1.8
Ni = 12-22
S = 0.2-0.5
Si = 2.9-3.2
W = 2.4-2.8
The vane bearing ring according to claim 1, wherein the balance = iron impurities or unspecified alloying elements has up to 3 % by mass .

Next alloy composition C = 0.4 to 0.6 having individual alloying elements, each expressed in mass%
Cr = 18.5-20.5
Nb = 1.4-1.8
Ni = 12.5-14
S = 0.25-0.45
Si = 2.9-3.15
W = 2.4-2.8
3. A vane bearing ring according to claim 2, wherein the balance = iron impurities or unspecified alloy elements up to 3 % by weight .

Next alloy composition C = 0.4 to 0.6 having individual alloying elements, each expressed in mass%
Cr = 24.5-26.5
Nb = 1.4-1.8
Ni = 19.5 to 21.5
S = 0.25-0.45
Si = 2.9-3.15
W = 2.4-2.8
3. A vane bearing ring according to claim 2, wherein the balance = iron impurities or unspecified alloy elements up to 3 % by weight .