Patent US4953447A successfully refreshed from Google Patents.
US4953447A
Expired / Lapsed
US
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Vacuum supply system in a motor vehicle
Assignee: Daimler Benz AG
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Filing: 1989-03-01
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Granted: 1990-09-04
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Expires: 2009-03-01
Abstract
Abstract A vacuum supply system for a brake power assist unit of a motor vehicle and at least one additional vacuum consuming device, is achieved by a parallel arrangement of two pipes leading from a vacuum generating device one to the brake power assist unit and one to the additional consuming device. Both pipes are equipped with flow control devices one of which is blockable by means of a check valve with an increased restoring or closing force for securing a vacuum supply priority for the brake power assist unit.
Inventors
- 👤 Franz Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:58
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T17/00; B60T17/02; B60T17/18; Y; Y10; Y10S; Y10S137/00; Y10S137/907; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7835; Y10T137/7836
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
149 words
A vacuum supply system for a brake power assist unit in a motor vehicle, as well as for at least one additional vacuum consuming device comprising: a main pipe being provided between a suction connection of a vacuum generating device and the brake power assist unit and having a first check valve therein; a branch pipe branching off from the main pipe to the at least one additional consuming device and which is connected between the suction connection and the first check valve and contains a second check valve therein; the second check valve permits a suction flow from the at least one additional consuming device to the vacuum generating device; a first flow control device fluidly connected in series with the second check valve; a bypass pipe having a second flow control device fluidly connected in parallel to the second check valve and the first flow control device.
Claim 2
Dependent Claim
149 words
A vacuum supply system for a brake power assist unit in a motor vehicle, as well as for at least one additional vacuum consuming device comprising: a main pipe being provided between a suction connection of a vacuum generating device and the brake power assist unit and having a first check valve therein; a branch pipe branching off from the main pipe to the at least one additional consuming device and which is connected between the suction connection and the first check valve and contains a second check valve therein; the second check valve permits a suction flow from the at least one additional consuming device to the vacuum generating device; a first flow control device fluidly connected in series with the second check valve; a bypass pipe having a second flow control device fluidly connected in parallel to the second check valve and the first flow control device.
Claim 3
Dependent Claim
39 words
A vacuum supply system according to claim 1, wherein the bypass pipe has a separate suction connection to the vacuum generating device; and wherein the vacuum generating device is constructed as a vacuum pump having two separate suction connections.
Claim 4
Dependent Claim
42 words
A vacuum supply system according to claim 1, wherein the bypass pipe and the second flow control device, the second check valve and the first flow control device are integrated in a common housing having two pipe connections with the branch pipe.
Claim 5
Dependent Claim
29 words
A vacuum supply system according to claim 1, wherein the second check valve is prestressed into its shut position with a higher restoring force than the first check valve.
Claim 6
Dependent Claim
19 words
A vacuum supply system according to claim 1, wherein the second check valve can be shut by outside power.
Claim 7
Dependent Claim
28 words
A vacuum supply system according to claim 1, wherein the second flow control device has its smallest clear cross-section with a diameter of between 0.6 and 1.0 mm.
Claim 8
Dependent Claim
35 words
A vacuum supply system according to claim 1, wherein a vacuum compensating tank is fluidly assigned to the at least one consuming device and wherein the vacuum compensating tank is connected to the bypass pipe.
Claim 9
Dependent Claim
39 words
A vacuum supply system according to claim 2, wherein the two check valves, the first flow control device and the junction of the branch pipe from the main pipe are arranged in a common housing having three pipe connections.
Claim 10
Dependent Claim
29 words
A vacuum supply system according to claim 2, wherein the second check valve is prestressed into its shut position with a higher restoring force than the first check valve.
Claim 11
Dependent Claim
29 words
A vacuum supply system according to claim 3, wherein the second check valve is prestressed into its shut position with a higher restoring force than the first check valve.
Claim 12
Dependent Claim
27 words
A vacuum supply system according to claim 4, wherein the first flow control device is fluidly arranged between the second check valve and the additional consuming device.
Claim 13
Dependent Claim
19 words
A vacuum supply system according to claim 4, wherein the second check valve can be shut by outside power.
Claim 14
Dependent Claim
36 words
A vacuum supply system according to claim 5, wherein the outside power for shutting the second check valve can be controlled by an electric switch coupled to an actuating arrangement of the brake power assist unit.
Claim 15
Dependent Claim
32 words
A vacuum supply system according to claim 5, wherein the outside power for shutting the second check valve can be controlled by an electric pressure switch acted upon by brake system pressure.
Claim 16
Dependent Claim
32 words
A vacuum supply system according to claim 4, wherein the second check valve is shut when the absolute vacuum in front of the first check valve is higher than approximately 0.4 bar.
Claim 17
Dependent Claim
29 words
A vacuum supply system according to claim 8, wherein the second check valve is prestressed into its shut position with a higher restoring force than the first check valve.
Claim 18
Dependent Claim
27 words
A vacuum supply system according to claim 9, wherein the first flow control device is fluidly arranged between the second check valve and the additional consuming device.
Claim 19
Dependent Claim
27 words
A vacuum supply system according to claim 10, wherein the first flow control device is fluidly arranged between the second check valve and the additional consuming device.
Claim 20
Dependent Claim
24 words
A vacuum supply system according to claim 13, wherein the electric switch is controlled by a vehicle stop light switch of the motor vehicle.
Claim 21
Dependent Claim
27 words
A vacuum supply system according to claim 16, wherein the first flow control device is fluidly arranged between the second check valve and the additional consuming device.
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |