DE6751030U - BRAKE SYSTEM, IN PARTICULAR FOR MOTOR VEHICLES. - Google Patents

Description

Priority; Jul 21, 1967 - FRANCE

Die! Firing unit affects braking systems especially for motor vehicles, of the type v hich a Betäiiguspszylinder or master cylinder istp provided / in serving * a pressure = average to displace into two independent Xreise and brake cylinders, of which certain a first chamber to V / ice s _t ^ v; which is connected with one of the circles, and E at least a second chamber, isolated from the first and connected with 'the other circle "

According to the innovation are to eliminate the Ifech parts, which result from the failure of a circle and, on the one hand, result from a considerable surname of the brake pedal lubricant make noticeable and on the other hand through a practically vsr °

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double! Craft for achieving the same delay that two independent circles emanating from the master cylinder are connected by two chambers of a junction that lead to both ,. Sides of a piston are provided, which is therefore on his, both surfaces is exposed to the action of the pressures prevailing in these chambers and which, furthermore, to the action of (Is exposed to restoring organs that endeavor to return it to a certain starting position, if the circles are not under pressure, and serves to ensure equality deT ensure the pressures prevailing in the two brake circuits. The piston expediently works together with a display element which is ineffective when the two circles are normal . • w. Work, and take effect when one or the other - the circle fails.

The juncture or "the Verbxndungszylinder can be arranged at any otelle the plant ER is provided in one piece with a two-stage actuating master cylinder .and proportional volume and its piston, udcher the action is exposed to the pressure prevailing in the chambers of the master cylinder pressures, has a limited stroke and is returned to its stop or rest position when the circles are not under pressure. The piston of the connecting cylinder therefore leaves its rest position when braking and ensures that the pressures in the two circles are equal.

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Another embodiment in which a master cylinder has chambers which displace the same volume has the associated connecting cylinder • a 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 ia connecting cylinder.

The independent circles emanating from the main cylinder have equal or proportional volumes over one suitable connecting cylinder connected to the brake cylinders with several options *

In the case of a master cylinder with a proportional volume, the circle with the stronger yerdräagüSs is connected to: each pressure cylinder of the vehicle, while the other circle is preferably connected to the two brake cylinders on the front wheels, with the circle assigned to the four wheels having to be fed more strongly ·

In a master cylinder bits equal volume of the compounds may be provided symmetrically., D h · _o. that one circuit can supply the two front brake cylinders and a lower brake cylinder from the connecting cylinder, and the second circuit is designed similarly

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

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If a circle fails, these arrangements allow » that the stroke of the pedal can be reduced to a considerable extent. The additional stroke of the pedal caused by the break. .... of a circle is in fact reduced to that which is necessary to displace »a volume of Brucltanmittel which is about half the volume, which by the piston of the connecting cylinder between the two piston stops is displaced, since this The piston is normally located in an intermediate position and this balances the pressures prevailing in the circles guaranteed. It should also be mentioned that in these arrangements with a braking system, in other cases the circles are symmetrical are, and if a circle fails, the same delay practically while maintaining the same force., -, is obtained on the pedal, because in this PalIe by the failure a circle which (cross-section of the main cylinder is practically reduced by half.

Further merJanale and advantages of the invention emerge from the following exemplary description - ^ in connection with the accompanying drawings, namely show:

Figures 1 and 2 are a longitudinal sectional view of the master cylinder of proportional volume with tilting valves or slide switch a connecting cylinder according to the invention of limited stroke;

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Fig. 3, also in axial section, a connecting cylinder of the previous type of display device;

ig · 4 and S two further embodiments of a connecting cylinder for a brake system;

6, 7 and 5 three installation options for a double-circle brake system with connecting cylinders.

In the embodiment shown in Fig «1 and 2, the a precautionary embodiment is »nit Io is a master cylinder and 11 generally denotes a connecting cylinder.

The illustrated main cylinder or »actuating cylinder Io orphans on the one hand chambers 12, 13 of proportional volume in which rigidly interconnected pistons 14 »15 can move, and on the other hand an attached connecting cylinder 11. The main cylinder shown in FIG provided with tilting valves, while the master cylinder shown in Fig. 2 is with slide circuit, the connecting cylinders 11 as such being similar to one another in their appearance.

In these versions, each main cylinder has a door the formation of the connecting cylinder an approach with a bore 17 for receiving a piston 18, which on his

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a surface is provided with an axial shaft 19 and on his other curses with an extension 2o. The Bohrimg 17 is closed by a threaded plug 22, against which one end of a return spring 23 is supported, which surrounds the shaft 19 of the piston

In this way there are two chambers 24, 25 on either side of the piston received »which on the one hand with the Kaxaaern 12, 13 of the main cylinder are connected by means of bores 26, 27 and on the other hand each with a circle 28, 29.

When the circles are not under pressure, the piston, the master cylinder and the associated connecting cylinder assume the positions shown in FIGS. 1 and 2. During normal operation, when an action is exerted on the brake pedal, the piston 15 displaces a larger pressure volume than that which is displaced by the piston 14. This has the consequence that the piston 18 of the connecting cylinder displaced against the action of spring 23 and its stop leaves "or rest position to engage in normal operation a substantially middle ^tl balance ^'l position in which these pistons equality the pressures prevailing in the two circles guaranteed.

The ends are in this "equilibrium" position of the shaft 9 and the extension 2o de3 Kolbons very close

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the end windings of the bore 17 and the plug 22, from which there is a limited stroke of the piston »

Even if one of the circles fails, the stroke of the piston 18 is small, so that the additional stroke of the pedal is also small ,

The arrangements described above also lead to the advantage that in the event of a circuit failure, the force on the pedal can practically be maintained, vena, the two independent circuits which operate the brake cylinders have a symmetrical structure with respect to one another.

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

For this purpose (Fig. 3), the connecting cylinder may be assembled with the master cylinder a .Kkörper 32 with a bore 33, in which a Organ 34 can move, which has two pistons. 55, 36 forms, an extension stop 37 on the one hand at its end parts and on the other hand, a bore 3s are provided for a return spring, which the latter is against the Biumrand one Stopper 4o is supported. This connecting cylinder is

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through pipes 42, 43 to the chambers 12 and 13 of the Hauptzylindars and connected to the circles 28, 29.

Between the two pistons 35, 36 is the organ 34 for the j Cooperation with a stylus 45 intended and has for for this purpose on both sides of a central part 46 ramps 47 and surfaces 48, 49, the latter having a larger diameter as the middle part 46 have

The stylus 45 is radially movable and can have a first Operate the switch like this, for example, the over ice visual

I ■■? Indicator element Sl 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 »Line line 5ö ... _r , opens into the chamber 57 ₃ which through the two pistons is formed and is connected to a container, not shown, "/.V-

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^ i

In the idle state, ie. _s when the elements are in the position shown in FIG. 3 - _; * For the position shown, »the contact So" is closed ¹¹ , i while the contact 55 is "open" ο During braking, during which the two circles are under pressure, the double piston 34 moves against the force of the spring 39 and assumes a central position in the cylinder and ensures the 'equalization of the pressures. The contact 5o is now "open" as a result of the movement' of the feeler finger, which is now in contact with the central zone 46, and the contact 53 as a result of the se-

movement of the pedal 55 is "closed" »so that the indicator lamp 51 is not under voltage» since the circles are working normally ·

In the opposite case nothing, if a circle is damaged, the double piston a left or a right end position, depending on which circle is damaged, whereby the, -. Touch finger 45 through one or the other of the rasps 47. ,,,, is pushed back, so that the contact So is "closed" · .... Since the switch 53 assigned to the pedal 55 is also "closed", the stress crisis and the α »μ <« · λ »β « « . _ ^ _Λ -51 energized · ., »,» «

If there is a difference in the Duxcöiessern the surfaces 4ö and AB , the feeler finger can operate two splitters Se ia 2 * three SehlieSsTeilungen, so that with a suitable design of the electrical circuit can be determined, __ ^ .. tric. . ^. ^ teiden circles is damaged · _ ^ ₅

Such a connecting cylinder is particularly useful for equipping determined by circles representing a master cylinder with proportional Have volume.

In the case of a brake system with syasic brake circuits, a Master cylinder with the same volume can be provided * In this Case © is the connecting cylinder of that shown in FIG

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Type _B which is preferably firmly connected to the main cylinder new · consists of one piece and has a body 60,. . in which a bore 61 is provided for a piston 62 ·. ., *. The body 60 is at both ends by screw plug _w . 63, 64 closed, which are hollow and form recesses for counter-, _ springs 65, 66, which in normal operation . "J. the brake circuits are used by means of plates 67, 68 the piston _. _M 62 to be arranged in a central position inside the body .._. _v . ^ The piston is provided with a seal 69 so that two separate chambers 7o, 71 are formed in the body ^ 60, of which - .., v ^ ·

■ -the one, for example the chamber 7o, with the one chamber *

of the main cylinder through a line 72 and with one ήζ \ Brake circuit 28 of the brake cylinder is connected, while W \ \ feie other chamber 71 over a line 74 with the other - '| y

IKasmer of the main cylinder and with dsm Brsmskrsis 29 of the Brsais * =

cylinder is in communication. With such a connection

ί fsylinder, which, if necessary, can be combined with the master cylinder from a '1

, (Piece can consist, as can be seen from Fig. 5, a jj ^ V ". ^ Display device may be provided, which shows the failure of a * ν Brake circuit reports.

For this purpose the piston 80 is the connecting cylinder
double and has a central part 81 on both sides
Ramps 82, 83 on which cylindrical surfaces 84,
85 connect. A stylus 86, which is normally
supported against the middle part 81 is via a switch 87

75 I.

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and an indicator lamp 88 having a power source 81 electrical tied together.

If a brake circuit fails, the pressures are there in the chambers 7o, 71 no longer in equilibrium, so that the piston 8o is displaced from its central position by the pressure of the normal brake circuit The plunger is returned to the stylus 86 by means of the ramp 82 or 83, depending on which Breaskrois has failed pressed, whereby the display lamp 88 is energized

In the previously "described several types Högliehkoiie exist" for dan installation rvelfcrsislger braking systems »

Three examples of binaries are shown in Figs. 6-8. In Fig. the master cylinder 9o is of the type with; proportional volume and assembled with the connecting cylinder to which a first focal circuit 91, which, for example, the four wheels RI - R4 of a vehicle, and a second area circuit 92 is connected, which only supplies the wheels R1 and R2, the old brake cylinders are equipped with a primary chamber, which is connected to one of the districts, and one Secondary caaaer have which isolated from the first and »It is connected to the other district.

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In the system according to FIG. 7, each of the brake circuits 93 _F 94 ₈ | going from the master cylinder 9B with equal volumes and with a connecting cylinder of the type described above from · = actuate three brake cylinder, said first Breisskreis 93 to the wheels R1 R2 and R3 _s acts ₉ while the other Breraskreis 94 to the wheels R1, R2 and R4 acts,

In the system according to FIG. 8, the two brake circuits I 96 j, 97 j, which emanate from the master cylinder 98 and the associated connecting cylinder _P supply each of the wheels RI "- R4 of the vehicle, which each have a brake cylinder 99 siit two chambers = i showseiio

It can also be provided unbalanced brake circuits, for example, four front wheel brake cylinders and two Hinterradbreniszylindern _{s p} a connecting cylinder of the embodiment shown in Fig. 4 type wherein the unit has a main · = · is cylindrically similar Deia fitted by the proportional volume in Figure "2 illustrated ₉ in order to take into account the infill asymmetry of the brake circuit law _o

The invention is not limited to the illustrated and described embodiments, but i * ~ iner can half its frame x'crscliiedene amendments out ₀

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Claims (8)

RA. 426 488 * 7/22/68 Expectations : 1 · Brake system for motor vehicles with an actuation «or Master cylinder for conveying pressure medium in two independent brake circuits and brake cylinders, of which certain one is connected to one of the Bresiskkreises first chamber and at least one second cadastre, .. which are isolated from the first and connected to the other brake circuit is connected, characterized dsö the two independent brake circuits with two chambers of a connection »Ylinders are connected, which two sides are one Piston are arranged so that this is exposed to the action of the pressures prevailing in the mentioned chambers on its two surfaces and also the action of Organs for resetting in a certain initial position, which return devices consist of at least one spring 2. Plant according to claim 1, characterized in that the Connecting cylinder with the main cylinder in one piece -13- exists or if it is »firmly assembled, 3. Plant according to claim 1 _P, characterized in that the piston of the Yerbinshiagssylinders stops su £ white _s which determine a small stroke of the piston » 4 · Plant according to claim 1, characterized in that the Master cylinder has two chambers, which displace proportional volume and with the chambers of the connecting cylinder are in communication ^ the piston of which the latter is provided with a single spring and is in the rest position is in a stop position » S ₄ Plant according to claim 1, characterized in that the Vorbindungszylinder has a piston which is exposed at its ends to the action of counter springs "about a central position in the said connection ^ cylindrical notified during normal operation of the Brejaskreise, the master cylinder two chambers has , which displace the same volume and with de. ¹ ! * Chambers of the pre-binding cylinder are connected » • 14 " FATE NATIONAL LAWYERS DR.-INQ. H. FINCKE DIPL.-ING. H. BOHR DIPL.-ING. S. STAEGER Telephone: * 26 60 60 S MUNICH 5, M0llerstra6e 31 - NOV 6. 1968 M 7638 S 65 564 / 63C C-bm SOCIBIE MQMMB DTJ IERQDO 6.) Plant according to claim 1, characterized in that the connecting cylinder (11) and a display element arranged is designed such that if a brake circuit fails, the display element is switched on mechanically. 7.) System according to one of claims 1 to 6 _5, characterized in that the Anseigeorgan one on the one hand two located on the piston combs (47) assigned and on the other side for the mechanical actuation of a switch (50) designed for the display stylus (45). 8.) System according to one of claims 1 to 6 «, characterized in that the piston (80) of the connecting cylinder has a first (82) and a second ramp (83} for each brake circuit, axially offset, the locking pin (86) assigned ZVi ⁴ T., vro ■ *? «?! der ^ eets- ^ if *; - => ls with respect to the piston radial be ~ ve:"I'll) ? ^{:: 7} : lf; C ".. n > v.use educated. ^c ·.) Ar! ??; - n ^r -ch claim 8. dadurco gekennseii ^ et; that the '^, r isrart -esteltet and ₅ that it is the'palpable; with "ue- -! c '-. e =: Ac.tsl \ *" ~. ~ leave. NCKt DIPL-ING.aIOHII D1? L-1KS- S. STASGSK