US4324436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic load-dependent braking-force control device
Assignee: Wabco Fahrzeugbremsen GmbH
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Filing: 1980-02-01
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Granted: 1982-04-13
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Expires: 2000-02-01
Abstract
Abstract A load-dependent braking force control device operable responsively to initial brake actuating pressure for initiating a light brake application until such pressure attains a certain predetermined higher valve, whereupon the control device, which is subject to a control pressure reflecting vehicle load, responds to such vehicle load control pressure for effecting a brake application accordingly. A piston for operating a fluid pressure supply and cut-off valve is subject on one side to fluid pressure supplied to the brake cylinders and on the opposite side to the same pressure communicated thereto via an adjustable pressure-limiting valve device, thereby determining the cut-off degree of the brake cylinder pressure.
Inventors
- 👤 Erich Reinecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:14
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T8/262; B60T8/263
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
188 words
An automatic load-dependent braking-force control device for fluid pressure actuated brake systems in motor vehicles or trailers and comprising: (a) a brake-pressure control piston assembly subjectable to brake control pressure and including a control piston and a flexible diaphragm secured thereto for axial movement therewith, (b) a dual function valve body cooperating alternatively with a supply valve seat to form a supply valve assembly and with an exhaust valve member to form an exhaust valve assembly, (c) said control piston having an upper pressure surface subjectable to brake control pressure of a brake-pressure transmitter via a control chamber and a fluid pressure control port, (d) said diaphragm having a lower pressure surface adjacent a brake-pressure delivery chamber communicating with and for delivering wheel brake cylinder pressure to a delivery port, (e) the degree of brake pressure delivered to said delivery port being determined via a cam element positionable according to vehicle weight, and wherein the improvement comprises: (f) a pressure-limiting valve device via which the brake-pressure delivery chamber situated below the diaphragm of said brake-pressure control piston assembly is connected with a supply chamber situated above said diaphragm.
Claim 2
Dependent Claim
188 words
An automatic load-dependent braking-force control device for fluid pressure actuated brake systems in motor vehicles or trailers and comprising: (a) a brake-pressure control piston assembly subjectable to brake control pressure and including a control piston and a flexible diaphragm secured thereto for axial movement therewith, (b) a dual function valve body cooperating alternatively with a supply valve seat to form a supply valve assembly and with an exhaust valve member to form an exhaust valve assembly, (c) said control piston having an upper pressure surface subjectable to brake control pressure of a brake-pressure transmitter via a control chamber and a fluid pressure control port, (d) said diaphragm having a lower pressure surface adjacent a brake-pressure delivery chamber communicating with and for delivering wheel brake cylinder pressure to a delivery port, (e) the degree of brake pressure delivered to said delivery port being determined via a cam element positionable according to vehicle weight, and wherein the improvement comprises: (f) a pressure-limiting valve device via which the brake-pressure delivery chamber situated below the diaphragm of said brake-pressure control piston assembly is connected with a supply chamber situated above said diaphragm.
Claim 3
Dependent Claim
45 words
An automatic load-dependent braking-force control device according to claim 1, wherein the pressure-limiting valve device is connected as a separate valve unit with said delivery chamber and said supply chamber, via respective lines, to ports formed in a housing of the automatic load-dependent control device.
Claim 4
Dependent Claim
39 words
An automatic load-dependent braking-force control device according to claim 2, wherein said pressure-limiting valve device includes a self-lapping supply valve assembly via which fluid pressure from said supply chamber is supplied to said delivery chamber at a predetermined pressure.
Claim 5
Dependent Claim
58 words
An automatic load-dependent braking-force control device according to claim 3, wherein said self-lapping supply valve assembly includes a cut-off spring for operating the supply valve assembly to a cut-off position in which said predetermined pressure is established, and an adjusting screw for adjusting the compression of said cut-off spring to a valve commensurate with the predetermined pressure desired.
References Cited (Backward Citations)
US4125290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |