Turbine casing for turbochargers

• US 4,389,845 A
• Filed: 09/22/1980
• Issued: 06/28/1983
• Est. Priority Date: 11/20/1979
• Status: Expired due to Term

• Current Assignee: Ishikawajima-Harima Jukogyo Kabushiki Kaisha
• Original Assignee: Ishikawajima-Harima Jukogyo Kabushiki Kaisha
• Inventors: Koike, Takaaki
• Primary Examiner(s): Hart, Douglas
• Application Number:
  US06/189,369
• Time in Patent Office: 1,009 Days
• Field of Search: 60/602, 60/600, 60/601, 60/603, 415/205, 415/145, 415/151, 415/204, 415/605
• US Class Current: 60/602
• CPC Class Codes: F01D 17/146 by throttling the volute inlet of radial machines or engines
• CPC Class Codes: F01D 9/026 Scrolls for radial machines or engines
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A turbine casing for turbochargers adapted for use with reciprocating internal combustion engines, in which in response to the flow rate of the exhaust gases from an engine, the exhaust gases are directed to flow through a first or radially inward scroll divided into two or more exhaust gas passages in the axial direction of a turbine wheel or through said first or radially inward scroll and a second or radially outward scroll, whereby regardless of the variations in flow rate an optimum supercharging efficiency can be maintained over the whole region of operating conditions of the engine.

Claims

1. A turbine casing for turbochargers having a turbine wheel, comprising:

(a) a first radially inward casing wall having an appended integral centrally positioned partition wall extending radially inward therefrom, said casing wall with said partition wall being formed to establish a first radially inward partially divided scroll surrounding substantially half of the periphery of the turbine wheel for service as first and second side-by-side exhaust passages in the axial direction of the shaft of said turbine wheel so that separate flows of exhaust gases from an engine may be directed through respective said passages to the portion of said turbine wheel surrounded by said first scroll;

(b) a second radially outward casing wall formed integral with and surrounding the entirety of said first casing wall, said second casing wall being formed to establish a second scroll located radially outward from said first scroll and utilizing said first casing wall as a portion of the boundary thereof, said second scroll being separated from and surrounding a major portion of said first scroll and having a terminal portion surrounding a further minor portion of the periphery of said turbine wheel additional to the portion surrounded by said first scroll, said second scroll thereby being adapted for service as a third exhaust passage surrounding and separated from said first and second exhaust passages so that a separate flow of exhaust gases from an engine may be directed through said third passage to said minor portion of said turbine wheel surrounded by said second scroll;

(c) casing structure formed integral with said first and second casing walls and providing a common inlet to said first and second scrolls for exhaust gases from an engine; and

(d) control valve means for selectively controlling the flow of the exhaust gases from said inlet to said second scroll while maintaining the flow of such gases to said first scroll.