Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1985-11-12
1988-01-19
Koczo, Michael
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
415155, 291568R, F02B 3712
Patent
active
047197579
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improvement in a turbocharger device in which an exhaust gas turbine is driven by the exhaust gas of an engine and a compressor for pressurizing the intake air of said engine is driven by the gas turbine.
BACKGROUND ART
An engine for motor vehicles such as automobiles is operated through an extremely wide area of engine speed ranging from an idling speed to the maximum speed and within a widely varying load range, and the quantity of its exhaust gas varies by a large margin. In an exhaust gas turbine having a single flow characteristics, therefore, it is not possible to recover and utilize the energy of the exhaust gas discharged from an engine thoroughly. So, a variable-volume turbocharger device has been already proposed in which a partition wall is provided in a turbine housing to divide the exhaust gas passage in said housing into two exhaust gas passages different in the flow characteristics and valve means are provided which are switchable to open either one of said divided exhaust gas passages, wherein said valve means are switched over to operate in accordance with the operating conditions such as the engine speed and load, thereby to improve the operational efficiency of the exhaust gas turbine.
In such a conventional variable-volume turbocharger device, two turbine flow characteristics can be obtained, but it is desirable to obtain plural turbine flow characteristics suited for the operating conditions of an engine.
The turbine housing of a turbocharger device can not be expected to be highly precise because it is manufactured by casting. Thus, it is difficult to form said partition wall and a turbine rotor in close relationship with high precision and a large clearance must be provided between the partition wall and the turbine rotor. In this case, the exhaust gas passage leading from the fore end of the partition wall to the turbine rotor is rapidly enlarged, with a disadvantage of resulting in loss.
DISCLOSURE OF INVENTION
It is a main object of the present invention to provide a variable-volume turbocharger device improved so that more turbine flow characteristics suited for the operating conditions of an engine can be obtained.
In order to achieve this object, the present invention proposes a variable-volume turbocharger device comprising a turbine housing having at least two exhaust gas passages different in the flow characteristics, divided by a partition wall, and two valve means for opening and shutting each of said exhaust gas passages selectively in response to the operating state of an engine to make the turbine flow characteristic variable.
According to the abovementioned composition, either one of the exhaust gas passages or both of them are opened by actuating these valve means to open or shut suitably in response to the operating state of the engine, whereby at least three turbine flow characteristics can be obtained and the exhaust gas turbine can be operated properly and with good efficiency. Besides, it is possible to shut both the exhaust gas passages at the same time, thereby to exhibit the exhaust braking function.
It is another object of this invention to provide a method for manufacturing a turbine housing for a turbocharger device, in which the fore end of the partition wall of the turbine housing can be formed in close relationship to a turbine rotor, in order that a loss caused by the rapid enlargement of its exhaust gas passage can be avoided.
To achieve this object, this invention proposes a method for manufacturing a turbine housing for a turbocharger device having at least two exhaust gas passages different in the flow characteristics, divided by a partition wall provided in its inside, which comprises previously forming an end member as a separate body from said partition wall, and then securing said end member on the inner circumferential part of said partition wall.
According to this method, the clearance between the fore end of said end member and a turbine rotor can be minimized, and a loss caused by th
REFERENCES:
patent: 4098085 (1978-07-01), McDowell
patent: 4165763 (1979-08-01), Hough
patent: 4526004 (1985-07-01), French et al.
Kohketsu Susumu
Matsura Yoshimasa
Nakazawa Norio
Takemoto Tetsuo
Koczo Michael
Mitsubishi Jidosha Kogya Kabushiki Kaisha
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