US4643075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-operated brake power booster
Assignee: ITT Inc
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Filing: 1985-02-20
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Granted: 1987-02-17
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Expires: 2005-02-20
Abstract
Abstract In a vacuum-operated brake power booster, a rubber reaction disc is arranged between a valve piston accommodated in the control housing and the push-rod co-acting with the piston of the master cylinder. The disc features a substantially circular truncated cone-shaped configuration, and is retained in a recess of the control housing in such a manner that its smaller circular disc-shaped frontal area faces the valve piston. The recess in the control housing is partly configured as a cylindrical bore and is furnished at its control piston-side end with a funnel-shaped portion against which a truncated cone-shaped portion of the rubber reaction disc is abutted. Notwithstanding the utilization of a highly soft rubbery-elastic material, the partly truncated cone-shaped configuration of the rubber reaction disc renders possible a very short overall length of the control assembly.
Inventors
- 👤 Wilfried Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:47
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/573; B60T13/575
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
239 words
A vacuum-operated brake power booster for assisting the operation of a master cylinder comprising a booster piston sealed relative to a booster housing and a piston rod coupled to a brake pedal, said piston rod serving to actuate a double valve by means of which a power chamber is alternatively connectible either to vacuum or to a higher differential pressure, said double valve including a first valve formed by a valve seat at said booster piston and a poppet valve preloaded in the direction of said valve seat and a second valve formed by said poppet valve and a valve piston connected to said piston rod, said booster piston connected to a control housing within which said valve piston is slidably supported, and a rubber reaction disc retained within said control housing, said rubber disc being subject to the action of said valve piston on one side thereof and of a push-rod connected to a piston of the master cylinder on the other side, said rubber reaction disc including a first cylindrical portion defining a first uninterrupted planar circular disc-shaped area adjacent said push rod, a second portion extending from said cylindrical first portion configured as a truncated cone having an external surface tapering symmetrically, linearly from said first cylindrical portion defining a second uninterrupted planar circular disc-shaped area adjacent said valve piston less than said first area and at least equal to the area of said valve piston.
Claim 2
Dependent Claim
239 words
A vacuum-operated brake power booster for assisting the operation of a master cylinder comprising a booster piston sealed relative to a booster housing and a piston rod coupled to a brake pedal, said piston rod serving to actuate a double valve by means of which a power chamber is alternatively connectible either to vacuum or to a higher differential pressure, said double valve including a first valve formed by a valve seat at said booster piston and a poppet valve preloaded in the direction of said valve seat and a second valve formed by said poppet valve and a valve piston connected to said piston rod, said booster piston connected to a control housing within which said valve piston is slidably supported, and a rubber reaction disc retained within said control housing, said rubber disc being subject to the action of said valve piston on one side thereof and of a push-rod connected to a piston of the master cylinder on the other side, said rubber reaction disc including a first cylindrical portion defining a first uninterrupted planar circular disc-shaped area adjacent said push rod, a second portion extending from said cylindrical first portion configured as a truncated cone having an external surface tapering symmetrically, linearly from said first cylindrical portion defining a second uninterrupted planar circular disc-shaped area adjacent said valve piston less than said first area and at least equal to the area of said valve piston.
Claim 3
Dependent Claim
53 words
The vacuum-operated brake power booster of claim 1, wherein a master cylinder-side end of said control housing includes a recess, said recess having a cylindrical portion complementary to said first cylindrical portion of said rubber reaction disc and a funnel-shaped portion complementary to said truncated cone second portion of said rubber reaction disc.
Claim 4
Dependent Claim
21 words
The vacuum-operated brake power booster of claim 1, wherein said second area is greater than the area of said valve piston.
Claim 5
Dependent Claim
257 words
A vacuum-operated brake power booster for assisting the operation of a master cylinder comprising a booster piston sealed relative to a booster housing and a piston rod coupled to a brake pedal, said piston rod serving to actuate a double valve by means of which a power chamber is alternatively connectible either to vacuum or to a higher differential pressure, said double valve including a first valve formed by a valve seat at said booster piston and a poppet valve preloaded in the direction of said valve seat and a second valve formed by said poppet valve and a valve piston connected to said piston rod, said booster piston connected to a control housing within which said valve piston is slidably supported, and a rubber reaction disc retained within said control housing, said rubber reaction disc being subject to the action of said valve piston on one side thereof and of a push-rod connected to a piston of the master cylinder on the other side, said rubber reaction disc including a first cylindrical portion defining a first uninterrupted planar circular disc-shaped area adjacent said push rod, a second portion extending from said cylindrical first portion configured as a truncated cone having an external surface tapering symmetrically, linearly from said first cylindrical portion to a diameter equal to the diameter of said valve piston, and a third cylindrical portion extending from said second truncated cone portion having a diameter defining a second uninterrupted planar disc-shaped area adjacent said valve piston equal to the area of said valve piston.
Claim 6
Dependent Claim
257 words
A vacuum-operated brake power booster for assisting the operation of a master cylinder comprising a booster piston sealed relative to a booster housing and a piston rod coupled to a brake pedal, said piston rod serving to actuate a double valve by means of which a power chamber is alternatively connectible either to vacuum or to a higher differential pressure, said double valve including a first valve formed by a valve seat at said booster piston and a poppet valve preloaded in the direction of said valve seat and a second valve formed by said poppet valve and a valve piston connected to said piston rod, said booster piston connected to a control housing within which said valve piston is slidably supported, and a rubber reaction disc retained within said control housing, said rubber reaction disc being subject to the action of said valve piston on one side thereof and of a push-rod connected to a piston of the master cylinder on the other side, said rubber reaction disc including a first cylindrical portion defining a first uninterrupted planar circular disc-shaped area adjacent said push rod, a second portion extending from said cylindrical first portion configured as a truncated cone having an external surface tapering symmetrically, linearly from said first cylindrical portion to a diameter equal to the diameter of said valve piston, and a third cylindrical portion extending from said second truncated cone portion having a diameter defining a second uninterrupted planar disc-shaped area adjacent said valve piston equal to the area of said valve piston.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |