Mechanical distributor injection pump having cold-start acceleration
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-037/04
출원번호
US-0301057
(2002-11-21)
우선권정보
DE-0056989 (2001-11-21)
발명자
/ 주소
Bofinger, Guenter
Banham, David
Freudl, Volker
출원인 / 주소
Robert Bosch GmbH
대리인 / 주소
Kenyon & Kenyon
인용정보
피인용 횟수 :
12인용 특허 :
5
초록▼
A high-pressure pump for supplying internal combustion engines with fuel includes a housing, on which a timing unit for displacing the point of injection is accommodated. The timing unit includes an injection timing piston having inlet bores, and a regulating slide, whose face facing a cold-start ac
A high-pressure pump for supplying internal combustion engines with fuel includes a housing, on which a timing unit for displacing the point of injection is accommodated. The timing unit includes an injection timing piston having inlet bores, and a regulating slide, whose face facing a cold-start accelerator piston has a prestress force applied to it, is movably accommodated in the injection timing piston. A spring element, which is applied directly to the injection timing piston, as well as a spring assembly, which is independent of the spring element and accommodated on a carrier and act on the regulating slide, are positioned between the cold-start accelerator piston and the opposing face of the injection timing piston.
대표청구항▼
1. A timing unit for a high-pressure pump for supplying an internal combustion engine with fuel, the timing unit displacing a point of injection and being accommodated on a housing of the high-pressure pump, comprising: a cold-start accelerator piston; an injection timing piston having inlet bo
1. A timing unit for a high-pressure pump for supplying an internal combustion engine with fuel, the timing unit displacing a point of injection and being accommodated on a housing of the high-pressure pump, comprising: a cold-start accelerator piston; an injection timing piston having inlet bores; a regulating slide movably accommodated in the injection timing piston, a face of the regulating slide facing the cold-start accelerator piston having an applied pre-stress force; and a first spring element, and a separate spring assembly accommodated on a carrier, positioned between the cold-start accelerator piston and the face of the injection timing piston; wherein the first spring element acts directly on a stop of the injection timing piston, and wherein the spring assembly acts on the regulating slide. 2. The timing unit as recited in claim 1, wherein the spring assembly includes a plurality of spring elements connected in series.3. The timing unit as recited in claim 1, wherein the spring assembly includes a second spring element and a third spring element supported on a spring support ring, the spring support ring being movably accommodated on the carrier.4. The timing unit as recited in claim 3, wherein the spring support ring includes a first side and a second side.5. The timing unit as recited in claim 3, wherein the second spring element is accommodated between the cold-start accelerator piston and the spring support ring, and has a first spring stiffness.6. The timing unit as recited in claim 3, wherein the third spring element is accommodated between the injection timing piston and the spring support ring, and has a second spring stiffness.7. The timing unit as recited in claim 1, wherein the cold-start accelerator piston includes a plurality of stepped contact surfaces on an interior surface of the cold-start accelerator piston, the interior surface facing toward a cavity.8. The timing unit as recited in claim 7, wherein a fourth spring element is accommodated between a first contact surface of the cold-start accelerator piston and an adapter plate, the adapter plate forming a stop ring for the injection timing piston.9. The timing unit as recited in claim 7, wherein the first spring element acting directly on the stop of the injection timing piston presses against a second contact surface of the cold-start accelerator piston.10. The timing unit as recited in claim 1, wherein the first spring element acting on the face of the injection timing piston presses a slotted disk against the face, a plurality of slotted legs of the slotted disk engaging a plurality of recesses provided, limiting an axial displacement path of the regulating slide.11. The timing unit as recited in claim 6, wherein the third spring element of the spring assembly is accommodated between the spring support ring of the carrier and a support ring of the regulating slide.12. The timing unit as recited in claim 1, wherein: the regulating slide includes a channel, the channel extending through a support ring; and when the regulating slide is pressed against a spring support ring, a cavity between the cold-start accelerator piston and the injection timing piston inside the timing unit is filled with fuel via a plurality of orifices provided on the spring support ring.
DiPerna, Paul M.; Brown, David; Rosinko, Mike; Kincade, Dan; Michaud, Michael; Nadworny, John; Kruse, Geoffrey A.; Ulrich, Thomas R., Infusion pump system with disposable cartridge having pressure venting and pressure feedback.
DiPerna, Paul M.; Brown, David; Rosinko, Mike; Kincade, Dan; Michaud, Michael; Nadworny, John; Kruse, Geoffrey A.; Ulrich, Thomas R., Infusion pump system with disposable cartridge having pressure venting and pressure feedback.
Verhoef, Erik T.; DiPerna, Paul M.; Rosinko, Mike; Williamson, Mark; Kruse, Geoffrey A.; Ulrich, Thomas R.; Lamb, Phil; Saint, Sean; Michaud, Michael; Trevaskis, William, Infusion pump system with disposable cartridge having pressure venting and pressure feedback.
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