Adjustable metering servovalve for a fuel injector, and relative adjustment method
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0357594
(2006-02-17)
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등록번호 |
US-8231105
(2012-07-31)
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우선권정보 |
EP-05425151 (2005-03-14) |
발명자
/ 주소 |
- Ricco, Mario
- Gorgoglione, Adriano
- De Matthaeis, Sisto Luigi
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출원인 / 주소 |
- C.R.F. Societa Consortile per Azioni
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
10 |
초록
▼
The metering servovalve (7) includes a valve body (8, 30), a shutter (45), and an electromagnet (15), and is housed inside a casing (2) of the injector (1). The electromagnet (15) activates a movable armature (16) performing a travel defined by a stop member (19) carried by the electromagnet (15), w
The metering servovalve (7) includes a valve body (8, 30), a shutter (45), and an electromagnet (15), and is housed inside a casing (2) of the injector (1). The electromagnet (15) activates a movable armature (16) performing a travel defined by a stop member (19) carried by the electromagnet (15), which is fixed inside the casing by a threaded ring nut (40) with the interposition of at least one deformable shim (48). The ring nut (40) is screwed to a predetermined tightening torque to a thread (46) on the casing (2) to elastically deform the shim (48). And the shim (48) is defined by a metal ring with, for example, an L-, C-, S-, Z- or Σ-shaped cross section.
대표청구항
▼
1. An adjustable metering servovalve and an internal combustion engine fuel injector, said fuel injector comprising: a control rod configured to be movable to control a pin shutter configured to close and open a fuel injection nozzle;the servovalve being housed in a casing of said fuel injector and
1. An adjustable metering servovalve and an internal combustion engine fuel injector, said fuel injector comprising: a control rod configured to be movable to control a pin shutter configured to close and open a fuel injection nozzle;the servovalve being housed in a casing of said fuel injector and comprising: a valve body;a control chamber which permanently communicates with an inlet via a passage to receive pressurized fuel and which is bounded axially at an end thereof by the control rod; the control chamber communicating with a draining passage;a shutter sliding along an axis between a forward position and a withdrawn position, where said shutter is defined by a sleeve integral with an armature; said sleeve sliding on a rod having at least one radial hole of the draining passage;an actuator for controlling said shutter, the actuator comprising:a) an electromagnet comprising a magnetic core having a polar surface perpendicular to said axis; andb) said armature performing a given travel defined by a pair of opposite stop members; one of said stop members being formed by said polar surface and being fixed inside said casing by a threaded member with the interposition of at least one shim; a support which holds in position said electromagnet; said threaded member being a threaded ring nut, which engages an annular shoulder of said support and is screwed with a predetermined tightening torque to a thread of said casing to fix said electromagnet inside said casing and to produce a corresponding tightening load on said shim; the bottom end of said support engaging an annular shoulder of said magnetic core; andsaid shim being located between said polar surface and a shoulder of a cavity of said casing and being deformable elastically by said threaded ring nut, as a function of said tightening torque, so as to adjust the travel of said armature, wherein said shim is defined by a ring made of elastically deformable material and wherein said ring has a cross section such that the ring is predominantly bendable. 2. A servovalve as claimed in claim 1 wherein said bendable ring has a cross section selected from a group comprising an L-shaped cross section, C-shaped cross section, S-shaped cross section, Z-shaped cross section, and Σ-shaped cross section. 3. A servovalve as claimed in claim 1, wherein said rod is carried by a guide body having a conical shoulder forming one of said opposite stop members; said sleeve having one end which is arrested against said conical shoulder. 4. A servovalve as claimed in claim 1, wherein said magnetic core is fixed inside said casing by a number of calibrated shims of modular dimensions; at least one of said shims being deformable elastically and at least one of said shims may be a rigid calibrated shim of modular dimensions. 5. A method of adjusting a metering servovalve as claimed in claim 4, comprising the following steps: providing the electromagnet having the magnetic core with a polar surface as being adapted to stop the travel of the armature controlling said shutter;providing the deformable shim as a ring having a cross section such as to be predominantly bendable upon an axial tightening load for adjusting said travel;providing a number of calibrated modular shims and selecting a rigid shim from said number to make, together with said deformable ring, a preliminary adjustment of said polar surface;establishing a given value of a parameter indicating the travel of said armature;setting said core to an approximate value corresponding said preliminary adjustment greater or less than the parameter value corresponding to the adjusted travel of said armature; andmaking a fine adjustment of said core by successive approximations from said preliminary adjustment to said parameter value. 6. The adjustable metering servovalve and an internal combustion engine fuel injector of claim 1, wherein the drain passage comprises a distribution portion formed in a guide body for guiding the armature, with said guide body comprising a base gripped by the casing with a rod extending from the base in a direction away from the control chamber, the guide body being positioned for axially guiding the sleeve of the armature. 7. The adjustable metering servovalve and an internal combustion engine fuel injector of claim 1, wherein the ring has a cylindrical configuration with a cross section having an outwardly extending bend to enable the ring to be predominantly bendable.
이 특허에 인용된 특허 (10)
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Ricco Mario,ITX, Adjustable metering valve for an internal combustion engine fuel injector.
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Hoffmann Kal-Heinz,DEX ; Krenz Olav,DEX ; Muller Manfred,DEX ; Stenger Claus,DEX, Control device for a high-pressure injection nozzle for liquid injection media.
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Knape Richard S. (Grand Rapids MI), Electromagnetic unit fuel injector.
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Kubo Ken-ichi (Higashimatsuyama JPX) Li Xin-he (Higashimatsuyama JPX), Electromagnetic valve and unit fuel injector with electromagnetic valve.
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Cerny Mark S. (Sterling Heights MI), Fuel injector end cap.
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Crofts, John D.; Truman, III, Arthur C.; Sung, Jung-min C.; Rauznitz, Peter, Fuel injector with feedback control.
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Mario Ricco IT; Adriano Gorgoglione IT, Internal combustion engine fuel injector.
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Wirth Robert L. (Ithaca NY) Bell David W. (Ithaca NY), Matrix print head and solenoid driver.
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Grytz, Uwe, Solenoid valve for controlling a fuel injector of an internal combustion engine.
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Wich Thomas J. (Springfield MA), Solenoid valve, particularly as bypass valve with fuel injector.
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