A turbocharger (1) with variable turbine geometry (VTG) having a guide grate (18) which surrounds a turbine wheel (4) radially at the outside, which has an adjusting ring (5) operatively connected to the guide blades (7) via associated blade levers (20) which are fastened to blade shafts (8) at one of the ends thereof. Each blade lever (20) has a lever head (23) which can be placed in engagement with an associated engagement recess (24), which has a base wall (26), of the adjusting ring (5), and which has a stop (25) at least for setting the minimum throughflow through the nozzle cross sections formed by the guide blades (7). The stop is a first support point (25) on the base wall (26), wherein, in the minimum throughflow position, the lever head (23) makes contact, via a wall surface (27) facing toward the base wall (26), with said first support point.
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0. 5. A turbocharger (1) with variable turbine geometry (VTG) having
a turbine housing (2) with a supply duct (9) for exhaust gases;
a turbine wheel (4) which is mounted rotatably in the turbine housing (2); and
a guide grate (18)
which surrounds the turbine wheel (4) radially at the outside,
which has a blade bearing ring (6),
which has a multiplicity of guide blades (7) which have in each case one blade shaft (8) mounted in the blade bearing ring (6),
which has a rotatable adjusting ring (5) operatively connected to the guide blades (7) via associated blade levers (20) which are fastened to the blade shafts (8) at one of the ends thereof, wherein each blade lever (20) has, at the other end, a lever head (23) in engagement with an associated engagement recess (24) in the adjusting ring (5), which engagement recess (24) has a base wall (26), of the adjusting ring (5), and
which has a maximum stop at least for setting the maximum throughflow through the nozzle cross sections formed by the guide blades (7),
wherein the maximum stop is a maximum stop support point (28) on the base wall (26) of the engagement recess, wherein, in the maximum throughflow position, the lever head (23) makes contact, via a lever head wall surface (27) facing toward the base wall (26), with said maximum stop support point (28) so that the adjusting ring (5) is stopped from further rotating past the maximum stop by the contact between lever head wall surface (27) of the lever head (23) and the base wall (26) of the engagement recess of the adjusting ring (5).
1. A turbocharger (1) with variable turbine geometry (VTG) having
a turbine housing (2) with a supply duct (9) for exhaust gases;
a turbine wheel (4) which is mounted rotatably in the turbine housing (2); and
a guide grate (18)
which surrounds the turbine wheel (4) radially at the outside,
which has a blade bearing ring (6),
which has a multiplicity of guide blades (7) which have in each case one blade shaft (8) mounted in the blade bearing ring (6),
which has an a rotatable adjusting ring (5) operatively connected to the guide blades (7) via associated blade levers (20) which are fastened to the blade shafts (8) at one of the ends thereof, wherein each blade lever (20) has, at the other end, a lever head (23) which can be placed in engagement with an associated engagement recess (24), in the adjusting ring (5), which engagement recess (24) has a base wall (26), of the adjusting ring (5), and
which has a minimum stop (25) at least for setting the minimum throughflow through the nozzle cross sections formed by the guide blades (7),
wherein the minimum stop is a minimum stop support point (25) on the base wall (26) of the engagement recess, wherein, in the minimum throughflow position, the lever head (23) makes contact, via a lever head wall surface (27) facing toward the base wall (26), with said minimum stop support point (25) so that the adjusting ring (5) is stopped from further rotating past the minimum stop by the contact between lever head wall surface (27) of the lever head (23) and the base wall (26) of the engagement recess of the adjusting ring (5).
2. The turbocharger as claimed in
3. The turbocharger as claimed in
4. The turbocharger as claimed in
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The invention relates to an exhaust-gas turbocharger.
A turbocharger of said type is known from EP 1 564 380 A1. To prevent weakening of the adjusting ring, said document proposes that a stop be provided which is integrally connected to the adjusting ring and which is composed of a web, the width of which may be varied or which may be provided with an adjustable headless screw. Said design duly yields, to a certain extent, the facility of an adjustable stop, but a stop constructed in this way would barely be feasible in practice because the spatial conditions would impede the insertion of a headless screw, which would moreover necessitate the provision of an internal thread in the integral stop part, and furthermore a locking facility for the headless screw would have to be provided in order to be able fix the position which has been set. This involves a high level of outlay owing to the extremely restricted spatial conditions in reality, and is therefore undesirable.
However, in the known turbocharger, as a result of the integral formation of the stop on the adjusting ring, it is possible only with relatively high outlay, if at all, to rework the projection of the stop after the assembly of the guide grate, for example if a correction of the end positions of the guide grate must be performed.
It is therefore an object of the present invention to provide a turbocharger, which turbocharger permits a simplification of the assembly of the guide grate or guide apparatus, wherein at least a simple and precise setting of the minimum throughflow should be possible by means of the guide apparatus alone.
According to the invention, it is consequently possible for the guide blade position in the cartridge or the guide grate to be realized by means of an inner stop between the adjusting ring and the blade lever or blade lever head. It is thereby possible for in each case one stop to be provided for the smallest blade position and preferably the largest blade position, without the need for additional components.
Further details, features and advantages of the invention will emerge from the following description of an exemplary embodiment on the basis of the drawing, in which:
To control the movement or the position of the guide blades 7, an actuating device 11 is provided. Said actuating device may be of any desired form, but a preferred embodiment has a control housing 12 which controls the control movement of a plunger rod 14 fastened thereto in order to transmit the movement thereof to an adjusting ring 5 situated behind the blade bearing ring 6, said movement being converted into a slight rotational movement of said adjusting ring. Between the blade bearing ring 6 and an annular part 15 of the turbine housing 2 there is formed a free space 13 for the guide blades 7. To be able to safeguard said free space 13, the blade bearing ring 6 has integrally formed spacers 16. In the example, three spacers 16 are arranged on the circumference of the blade bearing ring 6 at angular intervals of in each case 120°. It is however possible in principle for more or fewer such spacers 16 to be provided.
By contrast,
In
The two support points 25 and 28 are arranged symmetrically with respect to a radius line R which runs through the central point M8 of the blade shaft 8 and which extends from the central point M18 of the guide grate 18. In the intermediate blade position illustrated in
Said arrangement yields in particular the advantage that a defined stop can be formed both for the minimum position and also for the maximum position without the need for additional components to be manufactured and assembled. Each blade lever has its end stop at the inner stop with respect to the adjusting ring at a maximum but also equal angle deflection. As explained on the basis of
For the maximum stop, this means a very precise inner circle at the blade ends, which is important in particular for variable turbine geometry exhaust-gas turbochargers which are used for spark-ignition engines.
The solution according to the invention yields, for the minimum stop, a very precise, uniform duct formation with a correspondingly precise throughput characteristic value, which in turn is important for diesel engines.
Furthermore, as stated, the design according to the invention yields the advantage that at least one component, and therefore a number of machining processes on the blade bearing ring, and the associated assembly of such an additional component, can be eliminated. This yields not only a simplification of the design for the same technical effectiveness but also a cost advantage.
In addition to the above written disclosure of the invention, reference is hereby explicitly made to the diagrammatic disclosure thereof in
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