Patent US4898073A successfully refreshed from Google Patents.
US4898073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum brake force booster for use with automotive vehicles
Assignee: Continental Teves AG and Co OHG
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Filing: 1988-11-29
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Granted: 1990-02-06
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Expires: 2008-11-29
Abstract
Abstract A brake booster is dislosed wherein the risk of damage to the control valve housing of the booster in the area of the support of the guiding sleeve which guides the push rod is precluded. The guiding sleeve of the booster comprises an axial extension which, while accommodating the pressure plate and the reaction disc of the booster is located, in sealing manner, in the axial bore of the control valve housing of the booster.
Inventors
- 👤 Hermann Seip
- 👤 Wilfried Wagner
- 👤 Ralf Jakobi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:54
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/573
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A vacuum brake force booster for use with automotive vehicles, comprising a vacuum housing sealingly subdivided by an axially movable wall into a vacuum chamber and a working chamber, a mechanically actuable control valve for connecting the working chamber to the vacuum chamber and to the atmosphere, respectively, with the axially movable control valve housing thereof being formed of thermoplastic material and accommodating, within an axial bore, a rubber-elastic reaction disc in abutment with a pressure plate of a pushrod connected to an actuating piston of a master cylinder provided on a vacuum-side of the vacuum housing, the movable wall being in communication with the control valve housing and with a guiding sleeve adapted to axially guide the pushrods said guiding sleeve including a radial flange and an axial extension which, while accommodating the pressure plate and the reaction disc, is sealingly disposed in the axial bore of the control valve housing.
Claim 2
Dependent Claim
152 words
A vacuum brake force booster for use with automotive vehicles, comprising a vacuum housing sealingly subdivided by an axially movable wall into a vacuum chamber and a working chamber, a mechanically actuable control valve for connecting the working chamber to the vacuum chamber and to the atmosphere, respectively, with the axially movable control valve housing thereof being formed of thermoplastic material and accommodating, within an axial bore, a rubber-elastic reaction disc in abutment with a pressure plate of a pushrod connected to an actuating piston of a master cylinder provided on a vacuum-side of the vacuum housing, the movable wall being in communication with the control valve housing and with a guiding sleeve adapted to axially guide the pushrods said guiding sleeve including a radial flange and an axial extension which, while accommodating the pressure plate and the reaction disc, is sealingly disposed in the axial bore of the control valve housing.
Claim 3
Dependent Claim
42 words
The vacuum brake force booster according to claim 1, wherein the guiding sleeve, by means of a retaining ring, is held in the axial bore, with said retaining ring being located within a radial recess formed on a pushrod-side of the bore.
Claim 4
Dependent Claim
19 words
The vacuum brake force booster according to claim 2, wherein the retaining ring is of a claw ring-type configuration.
Claim 5
Dependent Claim
38 words
The vacuum brake force booster according to claim 2, wherein the material of the retaining ring corresponds to that of the control valve housing and the connection thereof to the control valve housing is effected by ultrasonic welding.
Claim 6
Dependent Claim
25 words
The vacuum brake force booster according to claim 2, wherein the connection of the retaining ring of the control valve housing is by an adhesive.
Claim 7
Dependent Claim
24 words
The vacuum brake force booster according to claim 1, wherein the axial extension of the guiding sleeve is press fitted into the axial bore.
Claim 8
Dependent Claim
24 words
The vacuum brake force booster according to claim 6, wherein the wall of the axial bore is provided with a plurality of axial ribs.
Claim 9
Dependent Claim
63 words
The vacuum brake force booster according to claim 1, wherein the axial extension of the guiding sleeve partly straddles a transmission ring guiding a transmission disc located between the control valve piston and the reaction disc, the transmission ring, on the one hand, being supported on the reaction disc and, on the other hand, being supported on the bottom of the axial bore.
Claim 10
Dependent Claim
40 words
The vacuum brake force booster according to claim 1, wherein the axial extension engages an axial recess confining, within the control valve housing, a radial annular face the size of which determines the transmission ratio of the brake force booster.
Claim 11
Dependent Claim
41 words
The vacuum brake force booster according to claim 8, wherein the axial extension is sealed against the control valve housing by a gasket located between the wall of the axial bore and a radially outwardly disposed surface of the transmission ring.
Claim 12
Dependent Claim
24 words
The vacuum brake force booster according to claim 9, wherein the axial extension is sealed against the control valve housing by the reaction disc.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |