Patent US3788710A successfully refreshed from Google Patents.
US3788710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid control system
Assignee: TDK Micronas GmbH
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Filing: 1972-08-21
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Granted: 1974-01-29
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Expires: 1992-08-21
Abstract
Abstract There is disclosed herein a plurality of hydraulically controlled separating valves, one for each vehicle wheel, of an antiskid control system. Each of the separating valves separates its associated wheel brake cylinder from the master cylinder when an electronic control system responsive to wheel speed sensors produces a first control value indicative of wheel skid and reconnects its associated wheel brake cylinder with the master cylinder when a further control value indicative of a given wheel reacceleration is produced by the electronic control system. A volume expansion arrangement is also provided for each of the separating valves to enable reacceleration of the wheels. All of the plurality of separating valves and volume expansion arrangements are arranged compactly in one single housing and the separating valves are maintained open by a primary control force, such as accumulator or pump pressure, the primary control force being controlled by the control valves to provide antiskid control. Should the primary control force be lost a single auxiliary force contained in the housing will operate on all the volume expansion arrangements and/or separating valves to maintain the separating valves in their open position so that the brake system is operative even though the antiskid control system is rendered inoperative. A mechanical and a hydraulic auxiliary force arrangement is disclosed.
Inventors
- 👤 Grunberg H Von
- 👤 W Fink
- 👤 D Kircher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:21
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
300 words
In an antiskid control system having an electronic control arrangement responsive to vehicle wheel speed to produce a first control value indicative of wheel skid and a further control value indicative of a given reacceleration of vehicle wheels, a control valve arrangement comprising: a plurality of wheel brake cylinders; a plurality of separating valves, each of said separating valves being disposed between said master cylinder and an associated one of said wheel brake cylinders; first means coupled to each of said separating valves to provide a primary control force for each of said separating valves, said primary control force normally holding each of said separating valves in their open position, said first control value interrupting said primary control force causing each of said separating valves to close and thereby interrupt a hydraulic connection between said master cylinder and the associated one of said wheel brake cylinders, and said further control value reapplying said primary control force causing each of said separating valves to open and thereby reestablish said hydraulic connection between said master cylinder and the associated one of said wheel brake cylinders; a plurality of second means in a predetermined association with said first means, each of said second means being associated with a different one of said separating valves to enable volume expansion of the pressure medium in the associated one Of said wheel brake cylinders when said separating valves are closed to enable reacceleration of said vehicle wheels; a single housing having said plurality of separating valves and said plurality of second means disposed therein compactly; and a single auxiliary force source disposed in said housing in a cooperative association with and common to each of said separating valves to maintain each of said separating valves in their open position upon failure of said primary control force.
Claim 2
Dependent Claim
300 words
In an antiskid control system having an electronic control arrangement responsive to vehicle wheel speed to produce a first control value indicative of wheel skid and a further control value indicative of a given reacceleration of vehicle wheels, a control valve arrangement comprising: a plurality of wheel brake cylinders; a plurality of separating valves, each of said separating valves being disposed between said master cylinder and an associated one of said wheel brake cylinders; first means coupled to each of said separating valves to provide a primary control force for each of said separating valves, said primary control force normally holding each of said separating valves in their open position, said first control value interrupting said primary control force causing each of said separating valves to close and thereby interrupt a hydraulic connection between said master cylinder and the associated one of said wheel brake cylinders, and said further control value reapplying said primary control force causing each of said separating valves to open and thereby reestablish said hydraulic connection between said master cylinder and the associated one of said wheel brake cylinders; a plurality of second means in a predetermined association with said first means, each of said second means being associated with a different one of said separating valves to enable volume expansion of the pressure medium in the associated one Of said wheel brake cylinders when said separating valves are closed to enable reacceleration of said vehicle wheels; a single housing having said plurality of separating valves and said plurality of second means disposed therein compactly; and a single auxiliary force source disposed in said housing in a cooperative association with and common to each of said separating valves to maintain each of said separating valves in their open position upon failure of said primary control force.
Claim 3
Dependent Claim
22 words
An arrangement according to claim 1, wherein said auxiliary force source provides a purely mechanical association with each of said separating valves.
Claim 4
Dependent Claim
61 words
An arrangement according to claim 2, wherein said auxiliary force source includes a spring-loaded component held in its retracted position by said primary control force; and each of said second means includes a push rod having one end thereof mechanically engaging the associated one of said separating valves and the other end thereof facing the front surface of said spring-loaded component.
Claim 5
Dependent Claim
70 words
An arrangement according to claim 3, wherein said housing includes an axially extending projection having an axially disposed cylindrical recess therein, and an accumulator piston disposed in a sealed, displaceable relationship with said recess; and said spring-loaded component includes a spring-loaded sleeve slidable on the outer surface of said projection, said spring-loaded sleeve having a wall transverse of the axis of said housing supporting one end of said accumulator piston.
Claim 6
Dependent Claim
38 words
An arrangement according to claim 4, wherein said recess confined in one direction by said accumulator piston is a pressure accumulator; and further including a motor; and a pump driven by said motor connected to said pressure accumulator.
Claim 7
Dependent Claim
34 words
An arrangement according to claim 5, further including third means coupled to said motor and in association with said accumulator piston to control said motor in response to the position of said accumulator piston.
Claim 8
Dependent Claim
87 words
An arrangement according to claim 6, wherein said spring-loaded component further includes a cup-shaped spring-pot disposed coaxially of the axis of said housing surrounding said spring-loaded sleeve, said spring-pot having the open end thereof secured to said housing, and a first spring surrounding said spring-loaded sleeve, one end of said first spring being supported by the bottom of said spring-pot and the other end of said first spring being supported on a radially, outward extending collar of said spring-loaded sleeve spaced from the bottom of said spring-pot.
Claim 9
Dependent Claim
39 words
An arrangement according to claim 7, wherein each of said separating valves and the associated one of said second means are disposed in an annular area of said housing spaced from the axis of said housing and said projection.
Claim 10
Dependent Claim
62 words
An arrangement according to claim 8, wherein said annular area includes a plurality of bores disposed parallel to the axis of said housing, each of said bores being coupled to said master cylinder and a different one of said plurality of wheel brake cylinders and each of said bores receives a different one of said second means in a slidably sealed relationship.
Claim 11
Dependent Claim
39 words
An arrangement according to claim 9, wherein each of said separating valves is disposed in a different one of said bores to control said hydraulic connection between said master cylinder and an associated one of said wheel brake cylinders.
Claim 12
Dependent Claim
22 words
An arrangement according to claim 10, wherein each of said separating valves is operable by a different one of said second means.
Claim 13
Dependent Claim
16 words
An arrangement according to claim 11, wherein each of said second means includes a stepped piston.
Claim 14
Dependent Claim
14 words
An arrangement according to claim 12, wherein each of said second means is bipartite.
Claim 15
Dependent Claim
62 words
An arrangement according to claim 13, wherein each of said second means includes a push rod extending through the associAted one of said bores and actuating the associated one of said separating valves, and a first sleeve surrounding said push rod, said first sleeve being slidably sealed to the inner surface of said associated one of said bores and said push rod.
Claim 16
Dependent Claim
35 words
An arrangement according to claim 14, wherein each of said bores includes an abutment on the inner wall thereof to confine the relative movement of said first sleeve and said push rod in one direction.
Claim 17
Dependent Claim
31 words
An arrangement according to claim 15, wherein each of said push rods includes a collar extending radially outward therefrom to engage a step in the associated one of said first sleeves.
Claim 18
Dependent Claim
48 words
An arrangement according to claim 16, wherein each of said second means further includes a second sleeve abutting an end of the associated one of said first sleeves spaced from the associated one of said separating valves and surrounding the associated one of said push rods with play.
Claim 19
Dependent Claim
57 words
An arrangement according to claim 17, wherein each of said second sleeves has its outer surface stepped and is slidably sealed with the inner surface of the associated one of said bores, the stepped portion of each of said second sleeves and the inner surface of the associated one of said bores forming an elongated annular chamber.
Claim 20
Dependent Claim
58 words
An arrangement according to claim 18, further including a plurality of electromagnetically controlled inlet valves opened in rest position, each of said inlet valves being coupled to a different one of said annular chambers and in common to said pump and said pressure accumulator, each of said inlet valves being controlled by said first and further control values.
Claim 21
Dependent Claim
66 words
An arrangement according to claim 19, further including a reservoir; a return hydraulic line coupled to said reservoir; and a plurality of electromagnetically controlled outlet valves closed in rest position, each of said outlet valves being coupled to a different one of said annular chambers and in common to said return line, each of said outlet valves being controlled by said first and further control values.
Claim 22
Dependent Claim
36 words
An arrangement according to claim 20, wherein each of said push rods extends a small amount from its associated one of said bores toward said collar of said spring-loaded sleeve in rest position of said arrangement.
Claim 23
Dependent Claim
79 words
An arrangement according to claim 13, wherein each of said second means includes a sleeve sealed to the inner surface of an associated one of said bores, each of said bores having a radially inwardly extending member, and a push rod longer than said sleeve slidably sealed to said sleeve and said inwardly extending member and having one end thereof extending outside said associated one of said bores, said one end of said push rod engaging said spring-loaded component.
Claim 24
Dependent Claim
69 words
An arrangement according to claim 22, wherein each of said second means further includes an annular chamber formed by the outer surface of said push rod, said inwardly extending member, the adjacent end of said sleeve and the inner wall of said bore, said annular chamber being connectable to said pressure accumulator by an electromagnetically controlled inlet valve and to a return line by an electromagnetically controlled outlet valve.
Claim 25
Dependent Claim
32 words
An arrangement according to claim 23, wherein the end of each of said push rods disposed within the associated one of said sleeves is actuable by brake pressure from said master cylinder.
Claim 26
Dependent Claim
85 words
An arrangement according to claim 24, wherein each of said sleeves include a radially inward extending collar on the end thereof adjacent the associated one of said separating valve, said collar having a central opening therethrough; and each of said push rods include a central projection on the end thereof with the associated one of said sleeves, said central projection extending through said central opening of said collar to hold the associated one of said separating valves open upon failure of said primaRy control force.
Claim 27
Dependent Claim
81 words
An arrangement according to claim 25, wherein each of said separating valves abut said collar of an associated one of said sleeves, said adjacent end of said sleeve being under said primary control force; and further including a second spring to prestress each of said separating valves and said associated one of said sleeves against said primary control force so that each of said separating valves is kept open with a small closing distance by the associated one of said sleeves.
Claim 28
Dependent Claim
23 words
An arrangement according to claim 26, wherein upon failure of said primary control force said second spring is overcome by said first spring.
Claim 29
Dependent Claim
24 words
An arrangement according to claim 1, wherein said auxiliary force source provides a hydraulically operating auxiliary force upon failure of said primary control force.
Claim 30
Dependent Claim
187 words
An arrangement according to claim 28, wherein said housing includes an axially extending projection having an axial outwardly stepped cylindrical recess therein, a central piston disposed in a sealed slidable relationship with the smaller diameter portion of said recess, and an annular piston disposed in a sealed slidable relationship with the inner surface of the larger diameter portion of said recess and the outer surface of said central piston, the outer surface of said solid piston, the inner surface of the larger diameter portion of said recess, said step and the end of said annular piston adjacent said step forming an annular chamber, said central piston having inward step adjacent the end thereof spaced from the smaller diameter portion of said recess, said annular piston having an inwardly extending first collar at its free end to engage said inward step of said central piston and an annular groove in the outer surface thereof; and said auxiliary force source includes a spring-loaded sleeve slidable on the outer surface of said projection, said sleeve having a radially inward extending second collar engaging said annular groove of said annular piston.
Claim 31
Dependent Claim
86 words
An arrangement according to claim 29, wherein said auxiliary force source further includes a spring-pot disposed coaxially of the axis of said housing surrounding said spring-loaded sleeve, said spring-pot having a bottom transverse wall and a radial inwardly extending flange secured to said housing, and a spring surrounding said spring-loaded sleeve, one end of said spring being supported by said bottom wall and the other end of said spring being supported on a radially, outward extending collar of said spring-loaded sleeve spaced from said bottom wall.
Claim 32
Dependent Claim
31 words
An arrangement according to claim 30, wherein said annular chamber is a pressure accumulator; and further including a motor; and a pump driven by said motor connected to said pressure accumulator.
Claim 33
Dependent Claim
34 words
An arrangement according to claim 31, further including third means coupled to said motor and in association with said annular piston to control said motor in response to the position of said annular piston.
Claim 34
Dependent Claim
48 words
An arrangement according to claim 32, wherein each of said second means includes a bore disposed in said housing, a plunger slidably sealed to the inner surface of said bore, and a counter piston normally spaced from said plunger slidably sealed to the inner surface of said bore.
Claim 35
Dependent Claim
64 words
An arrangement according to claim 33, further including an inlet valve opened in rest position connecting said pump and said pressure accumulator to a first space between said plunger, said counter piston and the inner surface of said bore; a reservoir; a return line connected to said reservoir; and an output valve closed in rest position connecting said first space to said return line.
Claim 36
Dependent Claim
77 words
An arrangement according to claim 34, further including a first chamber formed by one end surface of said plunger and one closed end of said bore, said first chamber being connected to said master cylinder anD an associated one of said wheel brake cylinders; and wherein an associated one of said separating valves is disposed in said first chamber to control the hydraulic connection between said master cylinder and said associated one of said wheel brake cylinders.
Claim 37
Dependent Claim
19 words
An arrangement according to claim 35, wherein said associated one of said separating valves is operable by said plunger.
Claim 38
Dependent Claim
50 words
An arrangement according to claim 36, further including a second chamber formed by one end surface of said counter piston and the other closed end of said bore, said second chamber being connected to a second space in said smaller diameter portion of said recess confined by said central piston.
Claim 39
Dependent Claim
37 words
An arrangement according to claim 37, further including a small chamber disposed in said housing connected to said second space, and a seat valve disposed in said small chamber closing in the direction of said second space.
Claim 40
Dependent Claim
27 words
An arrangement according to claim 38, further including a non-return valve connecting said small chamber in common to said first chamber of each of said second means.
Claim 41
Dependent Claim
19 words
An arrangement according to claim 39, wherein said seat valve is actuated by pressure medium from said master cylinder.
Claim 42
Dependent Claim
33 words
An arrangement according to claim 40, wherein said bore of each of said second means are disposed in parallel in said housing and in a vertical relationship to the axis of said housing.
Claim 43
Dependent Claim
27 words
An arrangement according to claim 41, wherein each of said inlet valves and each of said outlet valves are controlled by said first and further control values.
Claim 44
Dependent Claim
28 words
An arrangement according to claim 42, wherein each of said inlet valves and each of said outlet valves are controllable electromagnetically by said first and further control values.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |