Ceramic check for a fuel injector
First Claim
1. A fuel injector nozzle assembly comprising:
- a nozzle defining a guide bore, a fuel pressure chamber, a seat, and a nozzle orifice; and
a check valve member having an impact area and a guide portion slidably disposed in the guide bore between an open position in which the fuel pressure chamber is in fluid communication with the nozzle orifice and a closed position in which the impact area of the check valve member is pressing against the seat of the nozzle and the check valve member is blocking fluid communication between the fuel pressure chamber and the nozzle orifice; and
the check valve member comprising a ceramic material having a coefficient of thermal expansion α
>
8×
10−
6/°
C. when averaged over a temperature range of 0°
C. to 300°
C.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel injector nozzle assembly comprises a nozzle defining a guide bore, a fuel pressurization chamber, a seat, and a nozzle orifice. A check valve member has an impact area and a guide portion. The guide portion slides within the guide bore to allow the check valve member to slide between an open position and a closed position. In the open position the fuel pressurization chamber is in fluid communication with the nozzle orifice. In the closed position the impact area of the check valve member is pressing against the seat of the nozzle, and the check valve member is blocking fluid communication between the fuel pressurization chamber and the nozzle orifice. The check valve member comprises a ceramic material having a coefficient of thermal expansion α>8×10−6/° C. when averaged over a temperature range of 0° C. to 300° C.
116 Citations
24 Claims
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1. A fuel injector nozzle assembly comprising:
-
a nozzle defining a guide bore, a fuel pressure chamber, a seat, and a nozzle orifice; and
a check valve member having an impact area and a guide portion slidably disposed in the guide bore between an open position in which the fuel pressure chamber is in fluid communication with the nozzle orifice and a closed position in which the impact area of the check valve member is pressing against the seat of the nozzle and the check valve member is blocking fluid communication between the fuel pressure chamber and the nozzle orifice; and
the check valve member comprising a ceramic material having a coefficient of thermal expansion α
>
8×
10−
6/°
C. when averaged over a temperature range of 0°
C. to 300°
C.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A fuel injector having a fuel injector nozzle assembly comprising:
-
a nozzle defining a guide bore, a fuel pressure chamber, a seat, and a nozzle orifice; and
a check valve member having an impact area and a guide portion slidably disposed in the guide bore between an open position in which the fuel pressure chamber is in fluid communication with the nozzle orifice and a closed position in which the impact area of the check valve member is pressing against the seat of the nozzle and the check valve member is blocking fluid communication between the fuel pressure chamber and the nozzle orifice; and
the check valve member comprising a ceramic material having a coefficient of thermal expansion α
>
8×
10−
6/°
C. when averaged over a temperature range of 0°
C. to 300°
C.- View Dependent Claims (22, 23, 24)
-
Specification
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- Resources
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Current AssigneeCaterpillar Incorporated
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Original AssigneeCaterpillar Incorporated
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InventorsTandon, Rajan, Gondalia, Jayant B., Shafer, Scott F.
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Primary Examiner(s)Kashnikow, Andres
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Assistant Examiner(s)HWU, DAVIS D
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Application NumberUS09/383,287Time in Patent Office510 DaysField of Search239/DIG.19, 239/533.2, 239/533.3US Class Current239/533.2CPC Class CodesF02M 61/10 Other injectors with elonga...F02M 61/166 Selection of particular mat...Y10S 239/19 Nozzle materials
