Sliding piston cartridge and turbocharger incorporating same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-023/00
F01D-017/14
F01D-017/16
F01D-017/18
F01D-009/06
F02C-009/20
F02C-006/12
출원번호
US-0093747
(2005-11-16)
등록번호
US-8191367
(2012-06-05)
국제출원번호
PCT/US2005/041356
(2005-11-16)
§371/§102 date
20081006
(20081006)
국제공개번호
WO2007/058647
(2007-05-24)
발명자
/ 주소
Lombard, Alain R.
Mitka, Jerome
Le Gouareguer, Philippe
Antoine, Jocelyn
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Alston & Bird LLP
인용정보
피인용 횟수 :
2인용 특허 :
6
초록▼
A sliding piston cartridge (50) for a turbocharger (20) that is insertable into a bore (44) in the turbine housing (38) as a unit and that includes all of the components of a sliding piston type variable nozzle. The sliding piston cartridge comprises a carrier (52) having a tubular portion that inte
A sliding piston cartridge (50) for a turbocharger (20) that is insertable into a bore (44) in the turbine housing (38) as a unit and that includes all of the components of a sliding piston type variable nozzle. The sliding piston cartridge comprises a carrier (52) having a tubular portion that interfaces with the bore of the turbine housing. A sliding piston (62) is disposed within the carrier and makes sliding contact therewith. Vanes (58) are mounted on or formed as a part of the carrier at its upstream end, the vanes extending across a turbine nozzle. The piston slides between a closed position and an open position relative to the carrier. The tubular portion of the carrier can include openings (66) that are progressively uncovered by the piston as it moves toward the open position, to allow additional flow to enter the turbine wheel without passing through the vanes.
대표청구항▼
1. A turbocharger comprising: a center housing (22) containing a bearing assembly and a rotary shaft (26) mounted in the bearing assembly;a compressor wheel (24) affixed to one end of the shaft (26);a turbine wheel (40) affixed to an opposite end of the shaft (26) and disposed in a bore (44) of a tu
1. A turbocharger comprising: a center housing (22) containing a bearing assembly and a rotary shaft (26) mounted in the bearing assembly;a compressor wheel (24) affixed to one end of the shaft (26);a turbine wheel (40) affixed to an opposite end of the shaft (26) and disposed in a bore (44) of a turbine housing (38) that is coupled to an opposite side of the center housing (22), the turbine housing (38) defining a chamber (42) surrounding the turbine wheel (40) for receiving exhaust gas to be directed into the turbine wheel (40); anda sliding piston cartridge (50, 50′, 150)) comprising: a carrier (52, 52′, 152) inserted axially into the bore (44) of the turbine housing (38) with a radially outer surface of the carrier (52) engaging an inner surface of the bore (44), the carrier (52, 52′, 152) having a tubular portion (54) defining a central bore therethrough substantially coaxial with the turbine housing bore (44), the tubular portion (54) having an upstream end and a downstream end with respect to a flow direction of exhaust gas through the central bore, the carrier (52, 52′, 152) further comprising an array of circumferentially spaced vanes (58) axially projecting from the upstream end of the tubular portion (54), the vanes (58) having fixed ends joined to the tubular portion (54) and free ends that are adjacent a wall (60) of the turbine housing (38), the tubular portion (54) defining circumferentially spaced openings (66) downstream of the fixed ends of the vanes (58), connecting portions (72, 58′) being defined between the openings (66), the vanes (58) defining a first nozzle portion and the circumferentially spaced openings (66) and connecting portions (72, 58′) defining a second nozzle portion for directing exhaust gas from the chamber into the turbine wheel (40); anda tubular piston (62, 62′, 162) disposed in the central bore of the carrier (52, 52′, 152) such that the piston (62, 62′, 162) is axially slidable relative to the carrier (52, 52′, 152) between a closed position and an open position, the piston (62, 62′, 162) in the closed position substantially blocking exhaust gas from passing through the second nozzle portion to the turbine wheel (40), the piston (62, 62′, 162) progressively unblocking the second nozzle portion as the piston (62, 62′, 162) travels toward the open position. 2. The turbocharger of claim 1, wherein the tubular portion (54) of the carrier (52, 52′, 152) defines a ring (68) disposed between the fixed ends of the vanes (58) and the circumferentially spaced openings (66), the ring (68) having a portion (70) that extends radially inwardly and is positioned to be abutted by an upstream end of the piston (62, 62′, 162) in the closed position thereof. 3. The turbocharger of claim 1, wherein the connecting portions (72, 58′) are shaped as vanes. 4. The turbocharger of claim 1, wherein the sliding piston cartridge (50, 50′, 150) is configured such that when the openings (66) in the carrier (52, 52′, 152) are fully unblocked by the piston (62, 62′, 162), some of the exhaust gas flowing inwardly through the openings (66) bypasses the turbine wheel (40) and flows directly into the central passage of the piston (62, 62′, 162). 5. The turbocharger of claim 1, wherein the sliding piston cartridge (50, 50′, 150) is insertable into and removable from the turbine housing bore (44) as a unit. 6. The turbocharger of claim 5, wherein the carrier (52, 52′, 152) has an axial length exceeding that of the piston (62, 62′, 162). 7. The turbocharger of claim 6, wherein the piston (62, 62′, 162) is arranged with respect to the carrier (52, 52′, 152) such that a downstream end of the piston (62, 62′, 162) does not project axially beyond the downstream end of the carrier (52, 52′, 152) in the open position of the piston (62, 62′, 162). 8. The turbocharger of claim 1, wherein the tubular portion (54) of the carrier (52, 52′, 152) defines a pair of circumferentially spaced apertures (74) passing through a side wall of the tubular portion (54), and further comprising a mechanism for sliding the piston in the carrier, the mechanism comprising a pair of arms (78) having distal ends that extend through the apertures (74) in the side wall and engage the piston (62, 62′, 162). 9. The turbocharger of claim 8, wherein the arms (78) have proximal ends joined to a base (80), the arms (78) and base (80) forming a fork member (76), the fork member (76) being rotatable about an axis that extends transversely relative to an axis of the piston (62, 62′, 162) such that the arms (78) axially move the piston (62, 62′, 162). 10. The turbocharger of claim 1, wherein the cartridge (50′, 150) defines at least one bypass passage (90, 190), the at least one bypass passage (90, 190) being positioned to be blocked by the piston (62′, 162) when the piston (62′, 162) is in the closed position and to be uncovered by the piston (62′, 162) when the piston (62′, 162) is moved toward the open position such that a portion of exhaust gas flows from the chamber (42) through the at least one bypass passage (90, 190) and bypasses the bore (44) of the turbine housing (38). 11. The turbocharger of claim 10, wherein the at least one bypass passage (90, 190) is defined in the carrier (52′, 152), and further comprising at least one cavity (91, 191) formed between a radially outer surface of the piston (62′, 162) and a radially inner surface of the carrier (52′, 152) and connected with the at least one bypass passage (90, 190). 12. The turbocharger of claim 11, wherein the downstream end of the tubular portion of the carrier (52′, 152) defines at least one cutout (53′, 153) so that when the piston (62′, 162) is moved to the open position an opening develops between the downstream end of the piston (62′, 162) and the downstream end of the carrier (52′, 152) defined by the cutout (53′, 153), the opening being connected to the at least one cavity (91, 191) so as to allow said portion of exhaust gas to exit from the at least one cavity (91, 191) through the opening. 13. The turbocharger of claim 10, wherein the at least one bypass passage (90, 190) is formed through an upstream end face of the tubular portion of the carrier (52′, 152), and wherein the tubular portion of the carrier (52′, 152) defines a generally annular cavity (91, 191) formed in a wall thickness of the tubular portion and extending axially therealong, an upstream end of the annular cavity (91, 191) connecting with the at least one bypass passage (90, 190). 14. The turbocharger of claim 13, wherein the annular cavity (191) results in the tubular portion of the carrier (152) having a radially inner tubular portion (152a) and a radially outer tubular portion (152b), the piston (162) including an upstream portion (162a) of relatively smaller diameter that slidably engages the inner tubular portion (152a) and a downstream portion (162b) of greater diameter that slidably engages the outer tubular portion (152b), a downstream end of the outer tubular portion (152b) defining at least one cutout (153) arranged so that when the piston (162) is moved to the open position an opening develops between the downstream portion (162b) of the piston (162) and the outer tubular portion (152b) of the carrier (152) so as to allow exhaust gas to bypass the turbine wheel by passing through the at least one bypass passage (190), through the annular cavity (191), and out through the opening between the downstream portion (162b) of the piston (162) and the outer tubular portion (152b) of the carrier. 15. The turbocharger of claim 1, wherein an upstream end of the piston (62′) defines a plurality of slots (92) extending axially thereinto for receiving the connecting portions (58′) of the carrier (52′).
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이 특허에 인용된 특허 (6)
Engels, Berthold; Forster, Arno; Lingenauber, Robert; Jaisle, Jens-Wolf, Controllable exhaust gas turbocharger with a double-fluted turbine housing.
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