JPS5933858Y2 - Internal combustion engine turbocharger - Google Patents

Description

[Detailed explanation of the invention] For internal combustion engines, such as automobile engines, whose load fluctuations are extremely large, the output can be increased by installing a turbocharger, but in terms of fuel consumption, it is The fuel consumption rate worsens as it moves toward the load side.

The wastegate device improves this point, and the flow path area is selected to fully utilize the dynamic pressure of the exhaust gas at low loads when the exhaust temperature is low. A part of the exhaust gas reaches the exhaust pipe without passing through the exhaust turbine.

This proposal is intended to eliminate the need for the installation of wastegates and, going further, to ensure that the efficiency of the engine and the system, including the turbocharger, is maintained within a high range, as follows: As described in connection with the figures, a series of bimetallic guide vanes are supported by a support ring;
This guide vane forms a turbine nozzle that automatically changes its direction depending on the exhaust temperature.

FIG. 1 shows the exhaust turbine TB of the turbocharger, and FIG. 2 shows the impeller IP and guide vane GV of the exhaust turbine TB of FIG.

A series of guide vanes GV surrounding the impeller IP are made of bimetal, and their inner ends are supported by a support ring GR.

The guide vane GV is pressed to take the state shown by the solid line when the exhaust temperature is low and the load is low, giving the exhaust gas an inflow direction that most effectively applies dynamic pressure to the blades IV of the impeller IP, but as the load increases The deformation approaches the radial direction to expand the cross-sectional area of the exhaust flow path and direct the exhaust to the inflow direction in which the use of dynamic pressure is suppressed.

The dotted line in FIG. 2 shows the attitude taken by the guide vane GV under high load.

The bimetallic guide vane GV ultimately performs the same function as a wastegate, but structurally speaking,
It is much simpler than a wastegate, which requires a special piping button and a mechanism to control the amount of exhaust gas flowing through it.

As explained above, this proposal solves the problems of turbocharging devices for internal combustion engines, such as automobile engines, which have an extremely wide range of load fluctuations and rotational fluctuations, with a simple configuration. .

[Brief explanation of the drawing]

FIG. 1 is an overall view of an exhaust turbine of a turbocharger according to the present invention, and FIG. 2 is a partial view thereof, showing guide vanes and impellers. TB...Exhaust turbine, IP...Blade wheel, GV...Guide vane, IV...Blade, GR...Support ring.

Claims (1)

[Scope of utility model registration request] The inner ends of a series of bimetallic guide vanes GV are supported by a support ring GR surrounding the impeller IP of the exhaust turbine, and as the exhaust temperature shifts from a low load condition where the exhaust temperature is low to a high load condition where the exhaust temperature is high, the impeller A turbocharger for an internal combustion engine, characterized in that a guide vane GV has a characteristic of reducing the angle between the direction of the blade IV of the IP and the inflow direction of exhaust gas.