US4211200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum force amplifier for internal combustion engine
Assignee: Audi AG
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Filing: 1978-04-18
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Granted: 1980-07-08
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Expires: 1998-04-18
Abstract
Abstract The air intake of an internal-combustion engine passes through a throttle whose upstream and downstream sides are shunted by an idle-speed circuit. A vacuum-actuated auxiliary device has a vacuum line connected to the downstream side of the throttle. An injector-type jet pump connected in the idle circuit has an outlet connected to the downstream side of the throttle, a high-pressure inlet connected to the upstream side of the throttle, and a low-pressure input connected to the vacuum line. This jet pump serves as a vacuum amplifier during low-speed engine operation to ensure sufficient vacuum to drive the auxiliary load.
Inventors
- 👤 Rodolfo Rocchio
- 👤 Fritz Naumann
- 👤 Heinrich Strotkotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:12
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10209; F02M35/10229; B; B60; B60T; B60T17/00; B60T17/02; F02M17/00; F02M17/52; F02M17/525
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A system comprising: an internal-combustion engine having a throttle through which intake air passes and having an upstream side and a downstream side; an idle-speed circuit shunting said upstream and downstream sides of said throttle; an injector-type jet pump in said idle circuit having an output connected to said downstream side, a high-pressure input connected to said upstream side, and a low-pressure input; and a vacuum-actuated auxiliary device having a vacuum line connected to said low-pressure input.
Claim 2
Independent Claim
77 words
A system comprising: an internal-combustion engine having a throttle through which intake air passes and having an upstream side and a downstream side; an idle-speed circuit shunting said upstream and downstream sides of said throttle; an injector-type jet pump in said idle circuit having an output connected to said downstream side, a high-pressure input connected to said upstream side, and a low-pressure input; and a vacuum-actuated auxiliary device having a vacuum line connected to said low-pressure input.
Claim 3
Dependent Claim
28 words
The system defined in claim 1, further comprising a check valve between said pump and said device on one side and said downstream side on the other side.
Claim 4
Dependent Claim
18 words
The system defined in claim 1, further comprising means for varying the flow cross-section of said idle-speed circuit.
Claim 5
Dependent Claim
36 words
The system defined in claim 3 wherein said means for varying includes a nozzle in said pump constituting said low-pressure inlet, a restriction surrounding said nozzle, and means for displacing said nozzle relative to said restriction.
Claim 6
Dependent Claim
30 words
The system defined in claim 3 wherein said idle-speed circuit includes a bypass line shunting said pump and said means for varying includes a variable restriction in said bypass line.
Claim 7
Dependent Claim
47 words
The system defined in claim 1 wherein said pump is formed as a convergent-divergent nozzle having a convergent-divergent restriction opening to one side toward said high-pressure input and to the other side toward said output, and a nozzle constituting said low-pressure inlet opening centrally into said restriction.
Claim 8
Dependent Claim
25 words
The system defined in claim 1 wherein said device is a power-brake force amplifier and said system is adapted for use in an automotive vehicle.
References Cited (Backward Citations)
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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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |