DE1755999A1 - Brake system, especially for motor vehicles - Google Patents

Description

PATENT Attorneys, Λ Tf ζ> CQQA DR.-ING. H. FINOKE '' β μΟνοη'εν β, * Ä ■ llll I ■ DIPL.-ING. H. BOHR Ml.ir.li 31 4 Z. JULI1968 DIPL-ING. S. STAEQER F # r ar Mti 'it tHt

Γ-iappe 7638

Case 6ol

description

for patent application

of the company SOCIETE AKONYI-IE FRAUCAISE DU FERODO

Paris / France '

concerning

"Brake system, especially for ICr aft vehicles"

Priority: July 21, 19G7 - FRANCE

The invention relates to braking systems in particular for motor vehicles, of the type in which an actuating cylinder or main cylinder is provided "which serves a Drucl medium into two independent circuits and brake cylinder to comparable, ä pushing, certain of which a first chamber having, - ~ _M soft, with which one of the circles is connected, and at least., .. ^ »a second chamber isolated from the first and old dea ..,. -, * other circle is connected. ..., .- ■

According to the invention are to eliminate the disadvantages that arise from the failure of an ICreiscs and on the one hand noticeable through a considerable increase in the stroke of the brake pedal and, on the other hand, through a practically forward,

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double the force for targeting the same delay that two independent, outgoing from the master cylinder! travel «it two chambers of a junction connected, which are provided on both sides of a piston, which is therefore on his both surfaces of the effect of the prevailing in these chambers Is exposed to pressures and which is also exposed to the action of back parts that strive to to move it back to a certain starting position when the circles are not under pressure, and that is what »equality serves to ensure the pressures prevailing in the two brake circuits. The piston acts appropriately as an indicator together that is ineffective when the two circles are working normally and becomes effective when one or the other who fills the circles "

The connection point or the connection cylinder can be arranged at any point in the system. BR is from one piece with a two-stage actuation master cylinder and proportional volume provided and its piston, tdcher is exposed to the action of the pressures prevailing in the chambers of the master cylinder, has a limited stroke and is in its stop or rest position returned when the circles are not under pressure. The piston of the connecting cylinder therefore leaves its rest position when braking and ensures the equality of the pressures in the two circles. ■.

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del of another embodiment in which a master cylinder old camera, which displace the same volume, is provided »has the assigned connecting cylinder • In the piston, at its ends the action of counter springs is exposed, so that it assumes a central position in the normal operation of the circles in the connection * cylinder.

The independent circles of equal or proportional volumes can be created via a *

suitable connecting cylinder old connected to the breasx cylinders There are several possibilities.

For a master cylinder with proportional volume, the Circle with stronger displacement old each of the brake "

cylinder of the vehicle, while the other circle is preferably connected to the two brake cylinders of the front wheels is connected, the circle associated with the four wheels

must be fed more strongly. I.

In the case of a master cylinder with the same volume, the connections can be provided symmetrically, i.e. that of Connecting cylinder from which a circle can supply the two front brake cylinders and a lower brake cylinder, and the second circle is designed similarly.

In the same way, the two independent circles can each be connected to all brake lyladers of the vehicle wheels.

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In the event of a failure of the elnos circle, these arrangements that the! tab of the pedal can be reduced by a considerable amount can · Oer susätsliche stroke of the pedal; what a chore through the break of a circle is in fact reduced to that required to displace a volume of pressure medium which is about half the volume, which by the piston of the connection * cylinders between the two piston stops, since this piston is normally in an intermediate position and this the equalization of the pressures prevailing in the circles guaranteed. It should also be mentioned that in these arrangements with a urea system in which the circles are symmetrical are, and if a circle fails, an equal delay practically while maintaining the same force is obtained on the pedal, since in these cases the cross-section of the master cylinder is practically due to the falling out of a circle among other things is reduced by half.

More recent Morknale and advantages of the invention emerge from the following exemplary description in conjunction with the accompanying drawings, namely show:

Fig. 1 and Z a view in longitudinal section of the master cylinder

of proportional volumes with tipping valves or slide control of a connecting cylinder according to the invention of limited stroke;

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17581:

· 3, also in axial section, a verblndimgsz / linder der previous type with a display device;

· 4 and 5 xvei further execution * form a connection «· cylinder ι for a · braking »position;

6, 7 and 8 three installation options for a two-circuit Brake system with connection * cylinders <> μ

In the embodiment shown in Figs. 1 and 2, the a preferred embodiment * form is »is with Io a master cylinder and with 11 generally denotes a connecting cylinder

The illustrated master cylinder or actuation cylinder Io

have on the one hand Xaatmern 12, 13 of proportional volume on, in which rigidly interconnected pistons 14, 15 can move, and on the other hand an attached connecting J ungszyünder 11, the master cylinder shown in Fig. 1 is provided with tilt valves, while that shown in FIG

Master cylinder with slide circuit, whereby the Verbitulungs «

cylinder 11 as such are similar to one another in their appearance.

In these embodiments, each master cylinder has for The formation of the connecting cylinder is an approach with a Bore 17 to receive a piston 18, vclchor on soJnor

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• Inen Flieh · old »la · * axial ·« shaft 10 is provided 1st and on its other plate old an extension 2o. Tue Hole 17 is completed by the eleventh G «windoftopfea 3t, against the tick that · «la ·! lade« is supported in the * return spring 23, dl · surrounds the shaft 19 of the piston.

In this way previously with Kaaatrn 24, 2S xu both rare ^ d «s pistons received, which on the one hand the Xaans 12, 13 of the main cylinder * * itt * ls Bohmmgen 26, 27 in connection and on the other hand a young one «! Rice 28, 29.

When the circles are not under pressure, the piston of the main cylinder and the connected connection valves are shown in Fig. 1 and 2 stables shown. During normal operation, when a vibration is exerted on the brake pedal, the piston 15 displaces a greater pressure fctelyolumen than that which is pushed through by the Kdlbea 14. The result of the * f is that the piston It of the Yerbimdungstylinders advances 1% against the action of the spring and its stop is baw. Rühestellaws leaves, ta with noraale * operation an essentially middle · * CloichjjewicUts * · -Steiluni; a "stm" in which this piston ensures the equality of the pressure prevailing in the two ireison.

In this "equilibrium position" the ends of the shaft 9 and the extension 20 of the bulb are very close

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the end walls of the bore 17 lad of the plug 22, from which there is a limited Uub of the piston.

Even if the circles fail, the Uub of the piston is the same la low »so that the additional stroke of the pedal also is low

The drive arrangements described vorangeliend ausserden still de 'advantage, including failure of a circle daft practically the force can be maintained at the pedal when the two independent circuits _y who operate the brake cylinders have a syaoetrischen construction with respect to each other.

The connecting cylinder 11 can advantageously be provided with a device which enables the defective circle to be displayed

For this purpose (Fig. 3), if necessary, has elnoit main cylinder tusanmengobautc connection:; cylinder a body 32 old a bore 33 in which a Organ 34 can move, which forms two pistons 35, 36, on the one hand an extension stop 37 on their end parts and on the other hand a bore 38 for a return spring 39 are provided, which the latter is supported against the lind wall of a stopper 4o · This connecting cylinder is

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through pipes 42, 45 ait the chambers 12 and IS of the Main cylinder * and adt connected to circles 28, 29

Between the two pistons 35 _K 36, the organ 34 for the interaction is inscribed with a stylus 45 and for this purpose has ramps 47 and curses 48, 49 on both sides of a central part 46, the latter having a larger diameter than the latter Have middle part 46

The stylus 45 is radially movable and can actuate a first switch So, for example a visual Indicator 51 is electrically connected to a second switch 53 which is connected to a power source 54 and is under the action of the brake pedal 55. A line 56 opens into the Kanmer 57, which is formed by the two pistons and is connected to a container, not shown.

In the rest state, ie when the elements are in the position shown in FIG. 3, the contact 50 "is closed ⁴¹ , while the contact 53 is" open ". During braking, during which the two circles are under pressure, moves the double piston 34 counteracts the force of the spring 39 and assumes a central position in the cylinder and ensures the equalization of the pressures 53 as a result of the

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wegimg of the pedal 55 is "closed", so that the display · » laope Sl is not under tension, as the circles work normally

In the opposite case, if a circle is damaged, the coupling piston enters a left or right end position, depending on which circle is damaged, the feeler finger being pushed back by one or the other of the ramps 47, so that the Contact 5o is "closed" · Since the switch 53 assigned to the pedal 55 is also "closed ¹ *, the circuit and the display element 51 are energized.

If there is a difference in the diameters of the surfaces 48 and 49 the feeler finger can have two switches So in two closed positions operate, so that with a suitable design of the electrical circuit can be determined which of the suffering circles is damaged · "'

Such a pre-binding cylinder is particularly useful for equipment determined by circles which have a master cylinder with proportional volumes.

In a braking system with symmetrical brake circuits, a Master cylinder has been provided with the same Yoluawn .. Yes this one FaLU is the verb indane cylinder from the one in Pig, 4th

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Kind, which preferably old firmly connected in the main cylinder is biw · mis a · »piece consists of a body 60, Ia which a bore 61 provided for a piston 62 lit. The body 60 is plugged into its "two ends by screwing" 63, 64 closed, hollow flad and attachments for counter springs 65, 66 form which in normal operation the Breaskrelse are used by means of plates 67, 68 the flask 62 to be arranged in a central position la inside the body ·. The piston is old a seal 60 provided so that la body 6o two separate Xaaatrn 7o, 71 are formed, of which, dl · one, for example the connoisseur 7o, old one Kaaaer of the master cylinder through a line 72 and old dea one Brake circuit 28 is connected to the Ureas cylinder, while the other Kaamer 71 over a line 74 old the other Kaaaer of the main cylinder and old dea Breaslcreis 29 the Breas cylinder is in connection · With such a connection * · cylinder, which if necessary old dea master cylinder from a Stock can consist, as can be seen from Fig. S, a Display device be provided, which aoldet the failure of a district »

For this purpose the piston 8o of the connection is »cylinder double and points to both sides of an emitting part 81 Caterpillars 82, 83, to which cylindrical lines 84, 85 connect. Am feeler pen 86, which is normally against the middle part 81 is supported above a switch 87

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and an indicator lamp 88 BlC of the eleventh power source 81 electrical tied together"

When one of the focal areas is there, the pressures are there in the camera 7o, 71 not "more la balance" so that the piston 8o is displaced from its central position by the pressure of the normal brake circuit. By the shifting The piston becomes the contact pin 86 by means of the ramp 82 or 83 depending on which brake circuit has failed, pushed back, whereby the indicator lamp 88 is energized

With the designs described above, there are several options for installing two-circuit brake systems

Three bin construction examples are shown in Fig. 6-8. In Fig.

The master cylinder 9o is of the type nlt proportional volume g and assembled with the connecting cylinder to which a first Bresiskkreis 91 _r welchor, for example, the four wheels

RI - R4 of a vehicle, and a second brake circuit

52 is connected, which only supplies the wheels R1 and R2, with. Brake cylinders are equipped with a primary camera, ve1 which is connected to de «oinen of the brake circuits, and one

Secondary chambers have which are isolated from the first and

is connected to the other brake circuit.

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In the system according to FIG. 7, one or more of the brake circuits 93, 94, that of the master cylinder 95 with the same volume and with a Go out connecting cylinder of the type described above, actuate three brake cylinders, the first brake circuit 93 acts on the wheels RI, R2 and R3, while the other Brake circuit 94 acts on wheels RI, R2 and R4.

. In the system according to FIG 8 supply the two brake circuits 96, 97, run out from the master cylinder 98 and the associated connecting cylinder, each of the wheels RI - R4 of the vehicle up a respective brake cylinder 99 with two chambers, _t have. ß *

Asymmetrical brake circuits can also be provided, for example with four front brake cylinders and two Rear brake cylinders, a connecting cylinder from the ► in Fig. 4 shown type, the system with a main, cylinder of proportional volume similar to that shown in Fig. 2 is equipped to the filling asymmetry of the Brake circuits to take into account.

The invention is of course not limited to the illustrated and described embodiments, but can be used within Experience various changes to its framework. .. "

Expectations:

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BAO ORIGINAL

Claims (9)

Expectations : 1, bromine system for motor vehicles with an actuation or Main / linder for conveying pressure fluid in two independent Brake circuits and brake relievers, certain of which have a first camera connected to one of the brake circuits and at least one second chamber, which is isolated from the first and connected to the other brake circuit «characterized in that the two independent brake circuits are connected to two chambers of a connecting cylinder, welcho & u both sides of one Piston are arranged, so that this on its two surfaces the effect of the prevailing in the chambers mentioned Is exposed to pressures and furthermore to the action of Organs to return to a certain starting position, which restoring organs consist of at least one Fodsr. 2. Plant according to claim 1, characterized in that the pre-connecting cylinder with the dome master cylinder in one piece 109887/0510 exists or is built on this remainder. 3 «Aslage according to claim 1, characterized in that the Piston dosverbinduagszylimders has stops that determine a small stroke of the piston. 4 · Plant according to claim 1, characterized in that the Main cylinder has two cash registers, which displace proportional volume and sit the chambers of the connecting cylinder » connected, the piston of which the latter is provided with a single spring and is in the rest position is in a stop position 5 · Plant according to claim 1, characterized in that the The connecting cylinder of a piston has, as its find, the action of counter springs that it is exposed to With normal operation of the Bresskreise communicate a middle position in the mentioned connection cylinder, the master cylinder has two chambers, which displace the same volume and old the brackets of the connecting cylinder in Connected. 109887/0510 6 "plant" according to claim 1, characterized in that the Connection «cylinder interacting with an attachment organ can "that is imrirksan" if the two focal circles in work normally, and that comes into play when one or the other of the brake circuits fails, 7 * Plant according to claim 1 and 6, characterized in that the anseigeorgan has a stylus which is best itsut for this purpose, on the one hand with ramps provided on pistons cooperate and on the other hand a first switch to operate, which is electrically connected to a second switch via a sight cutter, which in turn is connected to a power source and can be operated by the brake pedal in the Üffmmgs- and closing direction. 8 · System according to claims 1, 6 and 7, characterized thereby net that the piston of the connecting pin 3 is axially offset has a first and a two-way ramp that each the brake circuits concern, dio one or the other this Ranpen depending on which Bremskrois failed is, cooperates with the mentioned stylus, which by a with respect to the piston radially movable element ge - 109887/0510 »* P forms is. 9. Plant according to claim 8, characterized in that the Both of the aforementioned frames are designed in such a way that they move the stylus with unequal amplitudes while the two assigned switches can deliver a signal, which shows the failed area area. For SOCXBTE ANONYMOUS FRAHCAISE DU FBRODO MTMT ANWXLTI RFINCICi DIPLHMO.H. -16 » 109887/0510