US4428228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing arrangements for multi-testing injection nozzles
Assignee: Robert Bosch GmbH
•
Filing: 1981-09-21
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Granted: 1984-01-31
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Expires: 2001-09-21
Abstract
Abstract A testing arrangement for testing injection nozzles in a nozzle holder combination, has a first testing circuit provided with a first pump for a hydraulic pressure medium and arranged for testing nozzles as to the throughflow, and a second circuit provided with a second pump for the hydraulic pressure medium and arranged for testing the nozzles as to the opening pressure, buzzing condition, tightness of nozzle holder combination and if necessary seat tightness and needle play of a nozzle, wherein the circuits are arranged so as to perform testing during operation of the nozzles.
Inventors
- 👤 Werner Banzhaf
- 👤 Klaus Brenner
- 👤 Ewald Eblen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:33
CPC Classifications
F; F02; F02M; F02M65/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
163 words
A testing arrangement for testing injection nozzles in a nozzle holder combination, as to throughflow, opening pressure, buzzing condition, tightness of the nozzle holder combination, and if necessary seat tightness and needle play of a nozzle, the testing arrangement comprising receiving means arranged to receive a nozzle holder combination; control means connected to said nozzle holder combination and arranged so that a hydraulic pressure medium at constant temperature flows therethrough and comprising testing means including a first testing circuit provided with a first pump for the hydraulic pressure medium and arranged for testing as to the throughflow, and a second circuit provided with a second pump for the hydraulic pressure medium and arranged for testing as to the opening pressure, buzzing condition, and tightness of nozzle holder combination, said control means further including a hydraulic switching means connected to the first and second testing circuits and to said nozzle holder combination so as to control all testing operations during a single testing cycle.
Claim 2
Dependent Claim
163 words
A testing arrangement for testing injection nozzles in a nozzle holder combination, as to throughflow, opening pressure, buzzing condition, tightness of the nozzle holder combination, and if necessary seat tightness and needle play of a nozzle, the testing arrangement comprising receiving means arranged to receive a nozzle holder combination; control means connected to said nozzle holder combination and arranged so that a hydraulic pressure medium at constant temperature flows therethrough and comprising testing means including a first testing circuit provided with a first pump for the hydraulic pressure medium and arranged for testing as to the throughflow, and a second circuit provided with a second pump for the hydraulic pressure medium and arranged for testing as to the opening pressure, buzzing condition, and tightness of nozzle holder combination, said control means further including a hydraulic switching means connected to the first and second testing circuits and to said nozzle holder combination so as to control all testing operations during a single testing cycle.
Claim 3
Dependent Claim
35 words
A testing arrangement as defined in claim 1, wherein said second pump of said second testing circuit is arranged to supply a constant quantity of the pressure medium per unit time during a testing cycle.
Claim 4
Dependent Claim
45 words
A testing arrangement as defined in claim 2, wherein said second pump of said second testing circuit has a rotatable pump cam and is arranged to supply a constant quantity of the pressure medium per unit time during a partial rotation of said pump cam.
Claim 5
Dependent Claim
55 words
A testing arrangement as defined in claim 1, wherein said second testing circuit has a pressure accumulator and a control valve arranged for connecting the nozzle only during the seat tightness testing with the pressure accumulator which supplies the pressure medium with a pressure which is slightly lower than the opening pressure of the nozzle.
Claim 6
Dependent Claim
45 words
A testing arrangement as defined in claim 1; and further comprising a pressure transducer formed as an absolute pressure transducer arranged to provide an information about the pressure as an electrical signal; and indicating means arranged to receive the electric signal from said pressure transducer.
Claim 7
Dependent Claim
43 words
A testing arrangement as defined in claim 1; and further comprising a laser light source arranged for emitting a beam extending directly over a nozzle opening; and a detector arranged to detect and evaluate the beam as a measure of needle seat tightness.
Claim 8
Dependent Claim
48 words
A testing arrangement as defined in claim 1, wherein said first pump of said first testing circuit is adjusted to a constant pressure, said first testing circuit including successively arranged a pressure accumulator for damping pressure variations, a manometer, a throughflow measuring transducer and a temperature measuring instrument.
Claim 9
Dependent Claim
46 words
A testing arrangement as defined in claim 1, wherein said first testing circuit includes measuring means connected in series to the first pump, said switching means being operable to supply directly the pressure medium to said nozzle holder combination so as to bypass said measuring means.
Claim 10
Dependent Claim
52 words
A testing arrangement as defined in claim 1, wherein said second testing circuit has an additional conduit and a pressure accumulator arranged in said additional conduit, said pressure accumulator being chargeable via a control valve which is located downstream of said second pump and also being connectable with said second testing circuit.
Claim 11
Dependent Claim
43 words
A testing arrangement as defined in claim 1, wherein said second pump of said second testing circuit has a cam which supplies a constant volume stream of pressure medium per a degree of its rotation over an angle of rotation of substantially 250°.
Claim 12
Dependent Claim
27 words
A testing arrangement as defined in claim 1; and further comprising electronic evaluating means arranged in said testing means to evaluate measured data in said second circuit.
Claim 13
Dependent Claim
21 words
A testing arrangement as defined in claim 1, wherein said second pump of said second testing circuit is an injection pump.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |