US3880476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic valve
Assignee: TDK Micronas GmbH
•
Filing: 1973-11-28
•
Granted: 1975-04-29
•
Expires: 1993-11-28
Abstract
Abstract There is disclosed an electromagnetic valve incorporated as the pressure medium flow regulator of an antiskid system. The valve body of the valve is connected with the magnetic armature to control the cross-sectional area of pressure medium flow through the valve in a continuous sequence proportional to the magnetic force resulting from the energizing current produced by the electronic circuitry of the antiskid system. By changing the energizing current, it is possible to change the pressure difference between the pressure medium source and the pressureoperated brake. Thus, the hydraulic antiskid control is more accurate and smoother than is achieved with previously employed open/close antiskid hydraulic control valves.
Inventors
- 👤 Juan Belart
- 👤 Werner Fink
- 👤 Dieter Kircher
- 👤 Grunberg Hubertus Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:58
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0603; F16K31/061; F16K31/0613; B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/3635; B60T8/3655; B60T8/366; B60T8/3665; F16K31/0624; F16K31/0627; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
320 words
An electromagnetic valve for use in an antiskid brake system comprising: a magnet housing having a first longitudinal axis; a magnet winding disposed in said housing coaxial of said axis; a magnetic return path disposed in said magnet housing magnetically coupled to said winding; a sleeve of non-magnetic material disposed in said return path coaxial of said first axis; a first chamber disposed in said magnet housing adjacent said sleeve and said return path; a valve body disposed coaxial of said first axis, at least a portion of said valve body projecting into said first chamber; a plurality of armature plates disposed in said first chamber, said armature plates having a central opening coaxial of said axis, the outer edges of said armature plates abutting said return path and being slightly inclined away from said return path, and the inner edges of said armature plates engaging said portion of said valve body projecting into said first chamber to move said valve body when said winding is energized and said armature plates adjacent said inner edges are attracted toward said return path; a spring disposed in said first chamber in an engaged relationship with said valve body and said armature plates to bias said valve body and said armature plates in a rest position; said valve body controlling the flow of a brake pressure medium through said valve between at least a brake pressure medium inlet and a brake pressure medium outlet when said winding is energized and said armature plates are attracted toward said return path; said spring including a diaphragm spring having openings therethrough and a central aperture coaxial of said first axis, the inner edge of said diaphragm spring adjacent said central aperture engaging a groove provided in said portion of said valve body projecting into said first chamber and the outer edge of said diaphragm spring being firmly connected to said magnet housing surrounding said first chamber.
Claim 2
Dependent Claim
320 words
An electromagnetic valve for use in an antiskid brake system comprising: a magnet housing having a first longitudinal axis; a magnet winding disposed in said housing coaxial of said axis; a magnetic return path disposed in said magnet housing magnetically coupled to said winding; a sleeve of non-magnetic material disposed in said return path coaxial of said first axis; a first chamber disposed in said magnet housing adjacent said sleeve and said return path; a valve body disposed coaxial of said first axis, at least a portion of said valve body projecting into said first chamber; a plurality of armature plates disposed in said first chamber, said armature plates having a central opening coaxial of said axis, the outer edges of said armature plates abutting said return path and being slightly inclined away from said return path, and the inner edges of said armature plates engaging said portion of said valve body projecting into said first chamber to move said valve body when said winding is energized and said armature plates adjacent said inner edges are attracted toward said return path; a spring disposed in said first chamber in an engaged relationship with said valve body and said armature plates to bias said valve body and said armature plates in a rest position; said valve body controlling the flow of a brake pressure medium through said valve between at least a brake pressure medium inlet and a brake pressure medium outlet when said winding is energized and said armature plates are attracted toward said return path; said spring including a diaphragm spring having openings therethrough and a central aperture coaxial of said first axis, the inner edge of said diaphragm spring adjacent said central aperture engaging a groove provided in said portion of said valve body projecting into said first chamber and the outer edge of said diaphragm spring being firmly connected to said magnet housing surrounding said first chamber.
Claim 3
Dependent Claim
30 words
A valve according to claim 1, wherein said groove is provided by a U-shaped cross-sectioned annular element mounted on said portion of said valve body projecting into said first chamber.
Claim 4
Dependent Claim
13 words
A valve according to claim 2, wherein said diaphragm spring is star shaped.
Claim 5
Dependent Claim
35 words
A valve according to claim 3, wHerein the characteristic curve of said diaphragm spring is adapted to the characteristic curve of an electromagnet including said winding, said return path, said sleeve and said armature plates.
Claim 6
Dependent Claim
165 words
A valve according to claim 4, further including a valve housing connected to said magnet housing, said valve housing havig a second longitudinal axis which is an extension of said first axis; a pressure medium source inlet connection extending through the wall of said valve housing; a pressure medium reservoir outlet connection extending through the wall of said valve housing; and a pressure medium wheel brake cylinder outlet connection extending through the wall of said valve housing; and wherein said valve body includes a valve slide extending from said first chamber into said valve housing coaxial of said second axis, said valve slide being disposed in a cooperative relationship with said source inlet connection, said reservoir outlet connection and said wheel brake cylinder outlet connection to control the flow of pressure medium between these three connections, said valve slide being pressure balanced in its rest position when the flow of pressure medium is between said source inlet connection and said wheel brake cylinder outlet connection.
Claim 7
Dependent Claim
43 words
A valve according to claim 5, further including a second chamber disposed in said valve housing embracing the end of said valve slide remote from said first chamber; and a duct disposed in said valve housing to interconnect said first and second chambers.
Claim 8
Dependent Claim
18 words
A valve according to claim 6, wherein said duct is connected to said wheel brake cylinder outlet connection.
Claim 9
Dependent Claim
16 words
A valve according to claim 6, wherein said duct is connected to said source inlet connection.
Claim 10
Dependent Claim
18 words
A valve according to claim 6, wherein said valve slide is formed by two pistons in tandem relationship.
Claim 11
Dependent Claim
63 words
A valve according to claim 9, wherein said two pistons are mechanically connected together, said two pistons being pressure-balanced in their rest position by the pressure present at said wheel brake cylinder outlet connection being applied to the remote ends of said two pistons and by the pressure at said source inlet connection being applied to the adjacent ends of said two pistons.
Claim 12
Dependent Claim
66 words
A valve according to claim 9, wherein said two pistons can move freely with respect to each other, said two pistons being pressure-balanced in their rest position by the pressure at said source inlet connection being applied to the remote ends of said two pistons and by the pressure at said wheel brake cylinder outlet connection being applied to the adjacent ends of said two pistons.
Claim 13
Dependent Claim
72 words
A valve according to claim 6, wherein when said winding is energized to provide a magnetic force said valve slide is actuated in a direction opposite to that of said magnetic force by pressure from said source inlet connection being applied to a first actuating surface and is actuated in the direction of said magnetic force by pressure from said wheel brake cylinder outlet connection being applied to a second actuating surface.
Claim 14
Dependent Claim
17 words
A valve according to claim 12, wherein said first and second actuating surfaces are equal in size.
Claim 15
Dependent Claim
32 words
A valve according to claim 12, wherein a current energizing said winding and consequently the pressure difference between said source inlet connection and said wheel brake cylinder outlet connection are continuously variable.
References Cited (Backward Citations)
US2627007A
Cited
US2892058A
Cited
US2938703A
Cited
US3231315A
Cited
US3749125A
Cited
US3690431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |