US3881786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inertia responsive proportioning valve
Assignee: ZF Active Safety US Inc
•
Filing: 1973-07-23
•
Granted: 1975-05-06
•
Expires: 1993-07-23
Abstract
Abstract A proportioning valve for the brake system of wheeled vehicle, which valve is operable at a preselected pressure to provide proportioning between inlet and outlet brake pressures at a selected ratio (other than 1:1) with the valve being responsive to a function of vehicle deceleration and to a function of brake pressure for varying the preselected pressure at which proportioning at the selected rate begins.
Inventors
- 👤 William Stelzer
- 👤 Edward J Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:06
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T8/00; B60T8/26; B60T8/28
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
270 words
In an automotive vehicle having front and rear wheel brake system, apparatus comprising: proportioning valve means in one of the systems actuable for modulating the brake pressure in that one of the systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, said proportioning valve means comprising a movable valve member and a valve seat member operatively connected in said one of the systems to modulate the brake pressure therein upon attainment of a first determinable magnitude of brake pressure, and bias means for maintaining said valve member and said valve seat member deactuated until attainment of said first determinable magnitude, a fluid chamber, a piston in said chamber and operatively connected to said movable valve member for varying the magnitude of said first determinable magnitude in accordance with variations in the magnitude of fluid pressure in said chamber, a member supported for movement in response to the deceleration of the vehicle, valve means normally fluid communicating said chamber with said at least part of said brake systems whereby the magnitude of fluid pressure in said chamber is determined by that pressure of said at least part of said brake systems, said member operatively connected with said valve means with said valve means closing said chamber from fluid communicating with said at least part of said brake systems in response to movement of sAid member in response to deceleration of the vehicle attaining a second determinable magnitude whereby the modulating effect of said porportioning valve means compensates for variations in loading of the vehicle.
Claim 2
Dependent Claim
270 words
In an automotive vehicle having front and rear wheel brake system, apparatus comprising: proportioning valve means in one of the systems actuable for modulating the brake pressure in that one of the systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, said proportioning valve means comprising a movable valve member and a valve seat member operatively connected in said one of the systems to modulate the brake pressure therein upon attainment of a first determinable magnitude of brake pressure, and bias means for maintaining said valve member and said valve seat member deactuated until attainment of said first determinable magnitude, a fluid chamber, a piston in said chamber and operatively connected to said movable valve member for varying the magnitude of said first determinable magnitude in accordance with variations in the magnitude of fluid pressure in said chamber, a member supported for movement in response to the deceleration of the vehicle, valve means normally fluid communicating said chamber with said at least part of said brake systems whereby the magnitude of fluid pressure in said chamber is determined by that pressure of said at least part of said brake systems, said member operatively connected with said valve means with said valve means closing said chamber from fluid communicating with said at least part of said brake systems in response to movement of sAid member in response to deceleration of the vehicle attaining a second determinable magnitude whereby the modulating effect of said porportioning valve means compensates for variations in loading of the vehicle.
Claim 3
Dependent Claim
36 words
The apparatus of claim 1 comprising means connected to said member for varying the magnitude of said second determinable magnitude in accordance with variations in the magnitude of fluid pressure in said one of the systems.
Claim 4
Dependent Claim
45 words
The apparatus of claim 1 with said member mounted in said chamber, bias means connecting said piston with said member whereby the magnitude of said second determinable magnitude will be varied in accordance with variations in the magnitude of the fluid pressure in said chamber.
Claim 5
Dependent Claim
232 words
In an automotive vehicle having front and rear wheel brake systems the improvement comprising: proportioning valve means in one of the systems actuable in response to attainment of a brake pressure of a determinable magnitude in said systems to initiate modulation of the brake pressure in that one of the systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, said proportioning valve means comprising a movable valve member and a valve seat member operatively connected in said one of the systems to modulate the brake pressure therein upon attainment of a first determinable magnitude of brake pressure, and bias means for maintaining said valve member and said valve seat member deactuated until attainment of said first determinable magnitude, means for controlling operation of said movable valve member for varying the magnitude of said first determinable magnitude, a pivotally supported member responsive to the deceleration of the vehicle, a fluid chamber, valve means communicable with said part of said brake system, said pivotally supported member operatively connected with said valve means such that said part of said brake system is selectively communicated with said chamber in response to movement of said member in response to deceleration of the vehicle, whereby the modulating effect of said proportioning valve means compensates for variations in loading of the vehicle.
Claim 6
Dependent Claim
232 words
In an automotive vehicle having front and rear wheel brake systems the improvement comprising: proportioning valve means in one of the systems actuable in response to attainment of a brake pressure of a determinable magnitude in said systems to initiate modulation of the brake pressure in that one of the systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, said proportioning valve means comprising a movable valve member and a valve seat member operatively connected in said one of the systems to modulate the brake pressure therein upon attainment of a first determinable magnitude of brake pressure, and bias means for maintaining said valve member and said valve seat member deactuated until attainment of said first determinable magnitude, means for controlling operation of said movable valve member for varying the magnitude of said first determinable magnitude, a pivotally supported member responsive to the deceleration of the vehicle, a fluid chamber, valve means communicable with said part of said brake system, said pivotally supported member operatively connected with said valve means such that said part of said brake system is selectively communicated with said chamber in response to movement of said member in response to deceleration of the vehicle, whereby the modulating effect of said proportioning valve means compensates for variations in loading of the vehicle.
Claim 7
Dependent Claim
72 words
The improvement of claim 4 with said proportioning valve means comprising spindle means movable for modulating the brake pressure in that one of the systems and with the modulation being a function of the movement of said spindle means, said deceleration means operatively connected with said spindle means for varying the initiation of said movement of said spindle means in accordance with variations in the magnitude of the deceleration of the vehicle.
Claim 8
Dependent Claim
43 words
The improvement of claim 5 with said deceleration means further comprising fluid pressure means for varying initiation of said movement as a function of the magnitude of the deceleration of the vehicle and of the magnitude of the brake pressure in said systems.
Claim 9
Dependent Claim
192 words
In an automotive vehicle having front and rear brake systems operated by fluid pressure, the improvement comprising: brake pressure proportioning means for modulating the brake pressure to provide a relatively lower pressure in the rear brakes and a relatively higher pressure in the front brakes to compensate for weight transfer during braking, said proportioning means comprising a proportioning valve having an open condition and a closed condition, spring means for keeping said proportioning valve open with a preselected bias, fluid pressure operated means responsive to said fluid pressure to increase the bias of said spring means to increase the resistance to actuation of said closed condition of said proportioning valve, control valve means actuable to a closed position for interrupting communication of said fluid pressure to said fluid pressure operated means to prevent further increasing of said bias of said spring means, vehicle deceleration sensing means for actuating said control valve means to said closed position in response To vehicle deceleration, and means responsive to the increase in bias of said spring means to resist actuation of said control valve means to said closed position until a higher vehicle deceleration is attained.
Claim 10
Dependent Claim
192 words
In an automotive vehicle having front and rear brake systems operated by fluid pressure, the improvement comprising: brake pressure proportioning means for modulating the brake pressure to provide a relatively lower pressure in the rear brakes and a relatively higher pressure in the front brakes to compensate for weight transfer during braking, said proportioning means comprising a proportioning valve having an open condition and a closed condition, spring means for keeping said proportioning valve open with a preselected bias, fluid pressure operated means responsive to said fluid pressure to increase the bias of said spring means to increase the resistance to actuation of said closed condition of said proportioning valve, control valve means actuable to a closed position for interrupting communication of said fluid pressure to said fluid pressure operated means to prevent further increasing of said bias of said spring means, vehicle deceleration sensing means for actuating said control valve means to said closed position in response To vehicle deceleration, and means responsive to the increase in bias of said spring means to resist actuation of said control valve means to said closed position until a higher vehicle deceleration is attained.
Claim 11
Dependent Claim
263 words
In an automotive vehicle having front and rear wheel brake systems, the improvement comprising: proportioning valve means in one of the systems actuable for modulating the brake pressure in that one system to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, first means for detecting the magnitude of deceleration of the vehicle, said first means including a member supported for movement in response to the deceleration of the vehicle and effective relative to the actuation of said proportioning valve means for magnitudes of deceleration below a determinable magnitude, second means for detecting the magnitude of the brake pressure in at least a part of said brake systems which results in said magnitude of deceleration, said second means including bias means for varying said determinable magnitude in accordance with variations in the magnitude of brake pressure in at least a portion of said brake system, said bias means comprising a piston in a chamber operatively connected with said member, valve means normally fluidly communicating said chamber with said at least part of said brake systems whereby said piston will be acted on by the fluid pressure in said chamber for varying said determinable magnitude, and actuating means operatively connected with said first and second means for varying the actuation of said proportioning valve means as a function of said magnitude of deceleration and the corresponding said magnitude of the brake pressure whereby the modulating effect of said proportioning valve means compensates for variations in loading of the vehicle.
Claim 12
Dependent Claim
263 words
In an automotive vehicle having front and rear wheel brake systems, the improvement comprising: proportioning valve means in one of the systems actuable for modulating the brake pressure in that one system to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, first means for detecting the magnitude of deceleration of the vehicle, said first means including a member supported for movement in response to the deceleration of the vehicle and effective relative to the actuation of said proportioning valve means for magnitudes of deceleration below a determinable magnitude, second means for detecting the magnitude of the brake pressure in at least a part of said brake systems which results in said magnitude of deceleration, said second means including bias means for varying said determinable magnitude in accordance with variations in the magnitude of brake pressure in at least a portion of said brake system, said bias means comprising a piston in a chamber operatively connected with said member, valve means normally fluidly communicating said chamber with said at least part of said brake systems whereby said piston will be acted on by the fluid pressure in said chamber for varying said determinable magnitude, and actuating means operatively connected with said first and second means for varying the actuation of said proportioning valve means as a function of said magnitude of deceleration and the corresponding said magnitude of the brake pressure whereby the modulating effect of said proportioning valve means compensates for variations in loading of the vehicle.
Claim 13
Dependent Claim
37 words
The apparatus of claim 8 with said actuating means comprising said piston operatively connected with said proportioning valve means for varying the actuation of said proportioning valve means in accordance with said magnitude of the brake pressure.
Claim 14
Dependent Claim
40 words
The apparatus of claim 9 with said member operatively connected with said valve means with said valve means closing said chamber from fluid communicating with said at least part of said brake systems in response to movement of said chamber.
Claim 15
Dependent Claim
42 words
The apparatus of claim 10 with said member being a weight secured for pivotal movement about an axis transverse to the longitudinal axis of the vehicle with the center of gravity of said weight being in vertical alignment with said transverse axis.
Claim 16
Dependent Claim
81 words
The apparatus of claim 10 with said valve means comprising a valve member actuable on said member and being responsive to the rate of increase in pressure in said at least part of said brake systems for applying a force on said member whereby said member will move to a position with said valve means closing at a lower magnitude of said determinable magnitude such as to provide compensation for rapid brake application as would occur in a panic stop situation.
Claim 17
Dependent Claim
221 words
In an automotive vehicle having front and rear wheel brake systems, the improvement comprising: proportioning valve means in one of the systems actuable for modulating the brake pressure in that one of the systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, said proportioning valve means including a valve member movable along a longitudinal axis toward and away from an associated valve seat, first means for detecting the magnitude of deceleration of the vehicle, and second means for detecting the magnitude of the brake pressure in at least a part of said brake systems which results in said magnitude of deceleration, and actuating means operatively connected with said first and second means for varying the actuation of said proportioning valve means as a function of said magnitude of deceleration and the corresponding said magnitude of the brake pressure whereby the modulating effect of said proportioning valve means compensates for variations in loading of the vehicle, said first means comprising a movable weight secured for pivotal movement about an axis transverse to both the longitudinal axis of the vehicle and the longitudinal axis of movement of said valve member with the center of gravity of said weight being in vertical alignment with said transverse axis.
Claim 18
Dependent Claim
221 words
In an automotive vehicle having front and rear wheel brake systems, the improvement comprising: proportioning valve means in one of the systems actuable for modulating the brake pressure in that one of the systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for weight transfer during braking, said proportioning valve means including a valve member movable along a longitudinal axis toward and away from an associated valve seat, first means for detecting the magnitude of deceleration of the vehicle, and second means for detecting the magnitude of the brake pressure in at least a part of said brake systems which results in said magnitude of deceleration, and actuating means operatively connected with said first and second means for varying the actuation of said proportioning valve means as a function of said magnitude of deceleration and the corresponding said magnitude of the brake pressure whereby the modulating effect of said proportioning valve means compensates for variations in loading of the vehicle, said first means comprising a movable weight secured for pivotal movement about an axis transverse to both the longitudinal axis of the vehicle and the longitudinal axis of movement of said valve member with the center of gravity of said weight being in vertical alignment with said transverse axis.
Claim 19
Dependent Claim
58 words
The apparatus of claim 13 with said first means comprising a weight supported for movement in response to the deceleration of the vehicle and effective relative to the actuation of said proportioning valve means for magnitudes of deceleration below a determinable magnitude and bias means for maintaining said weight effective for magnitudes of deceleration below said determinable magnitude.
References Cited (Backward Citations)
US3317251A
Cited
US3377108A
Cited
US3588188A
Cited
US3542167A
Cited
US3476443A
Cited
US3455609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |