FR2542266A1 - BRAKE EQUIPMENT WITH TWO CIRCUITS - Google Patents

Abstract

TWO-CIRCUIT BRAKING EQUIPMENT, COMBINED WITH AN ANTI-LOCK DEVICE. THE ANTI-LOCK DEVICE INCLUDES A PRESSURE CONTROL VALVE 1 CONTAINED WITH TWO CIRCUITS, SO THAT IT MONITORS THE TWO BRAKE CIRCUITS I, II. IT CAN BE MADE TO DELIVER PRESSURE TO ONE OR TWO CHANNELS. THE TWO-CIRCUIT BRAKE EQUIPMENT IS ADVANTAGEALLY USED ON UTILITY VEHICLES, SUCH AS TRUCKS AND COACHES.

Description

The present invention relates to a braking equipment with two

  circuits for vehicles, with a two-stage braking valve

  bicycles, wheel brake cylinders that said valve feeds by two braking circuits, and a pressure control valve equipped with main distributors and part of an anti-lock device essentially consisting of wheel sensors, a

  electronic switching device and electronic distributors

  Magnetic driving equipment Such braking equipment is known (Patent Application of the Federal Republic of Germany published

under No. 2625502).

  The known equipment uses a pressure control valve, which a brake valve controls by a circuit (axle) The

  -the cost of the anti-lock device must be practically doubled when -

  such a one-circuit pressure control valve must be used

  used in braking equipment acting on two circuits on

an axle or wheel.

  * For example, two pressure control valves

  parallel attack by the electronic switching device

  must be used for both braking circuits of a

  vehicle wheel In addition to doubling the cost of valves, the

  The electronic switching system must be specially

  to be able to ensure - not only the order but also the supervision

  functional lance in parallel with pressure control valves.

  According to an essential characteristic of the invention, the valve

  The pressure control valve is made of two circuits.

  Two-circuit pressure device according to the invention has the advantage of a significant reduction in the number of spare parts. A special electronic switching device is otherwise useless, since normal standard electronics are usable, of the usual type for

  one-circuit pressure control valves.

  Other features and advantages of the invention will be better

  understood using the detailed description below of examples of

  embodiment and the accompanying drawings, in which: FIG. 1 shows a two-channel pressure control valve;

and two circuits;

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  FIG. 2 shows a pilot valve with two circuits and selec-

  pressure control for one-circuit control; and Fig. 3 shows a single-channel pressure control valve

and two circuits.

  A pressure control valve 1 comprises a symmetrical body 2

  with respect to a median axis 3 On either side of an inter

  medial 4 are two identical halves 5 and 6 of the body,

  each holding a 3/2 distributor 7 or 8 and two distributors 2/2 9 or 11 and 11 or 12 The Distributerus 7 to 12 are main distributors; they comprise valve seats integral with the body and resilient members constituting shutters, the control part of which is formed as membranes 13, 14, 15, 16, 17, 18. As a result of the symmetrical arrangement of the dif- 5 and 6, the membranes 13 and 14, 15 and 16, 17 and 18 are opposite and form

  thus each time a common volumetric chamber 19, 20, 21.

  Each membrane 15 or 16 is a double member with an internal pusher

median 15 'or 16'.

  The intermediate plate 4 serves on the one hand at the center centering of the control membranes 13, 14, 15, 16, 17, 18 This is important for a perfect control of the predetermined braking pressures by a two-circuit main brake valve 24 The intermediate plate 4 also ensures the application of the control pressures coming from a control valve 25 shown in FIG. 2. Three piloting valves 25, one for each pair of main distributors 7/8, 9/10 , 11/12, are housed in the body 2 of the pressure control valve 1 Two outlets 26, 27 and 28,

  29 of the pressure control valve 1 are connected by means of a

  braking device 30, 31 or 32, 33 to a wheel brake cylinder 34, 35 or 36, 37, a pair of which is fitted to each wheel of the vehicle 38 or 39. The wheel brake cylinders are however also

  in two-piston cylinders, in the form of a constructive unit.

  The control valve 25 is connected to two lines 40 and 41 coming from the two-circuit braking valve 24, and has a two-way distributor 42 allowing the selection of the pressure

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  FIG. 2 also shows that the two 3/2 distributors 7 and 8 each monitor an outside air channel 43 or 44, which a relief valve connects to the outside. is provided for each pair of distributors 7/8, 9/10 or 11/12. Such a piloting valve 25 comprises a frame 46, which carries the shutters 47, 48 of two seats 49, 50 and to which the magnetic forces produced. by a coil 51 print a move-and-go between the seats 49, 50 against

  the force exerted by a spring 52.

  The operation of the two-circuit braking device

described is the following.

  During braking, the two lines 40 and 41 are fed by the two-circuit braking valve 24. By the open main distributors 7, 8, 9, 10, 11, 11, the braking air reaches the braking lines 30, 31, 32, 33 Braking is produced in two circuits, ie by two brake cylinders 34, 35 or 36, 37

on each wheel 38 or 39.

  The wheel sensors react to a risk of blockage The coil 51 of the central control valve 25 first receives current from an electronics and can thus pass to its other limit position. The highest pressure is transmitted by the distributor to two lanes 42 in the intermediate plate 4 and pushes the membranes first

  , 16 in their other limit position, by their intermediate push

  15 'or 16' The main distributors 7 and 8 are closed.

  The braking air supply is thus interrupted. The other two piloting valves 25 and the four main distributors 9, 10, 11, 12 then make it possible to maintain, clock or in common with

  the pair of main distributors 7 and 8 purge the pressure.

  It can thus be seen that the braking pressures have an entirely two-circuit path and are monitored by two circuits,

  even in the event of antilocking, but a steering pressure at a cir-

  The combination of a main distributor 3/2 7 or 8 and two main distributors 2/2 9 and 11 or 10 and 12 then also allows a modulation of the temperature of the combustion chamber 19, 20, 21. two-channel pressure, that is to say

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  each wheel 38 or 39 has its own regulation.

  An essential requirement for compact construction and

  The economics of such a multifunctional valve are thus satisfied.

  The braking capacity of a two-circuit wheel brake does not differ

  Moreover, it does not have the effect of a single-circuit wheel brake, that is to say that the volume of the two brake cylinders is substantially equal to that of the single-cylinder model; the valve sections of the two-circuit pressure control valve can therefore

  to be reduced compared to a single-circuit valve.

  for a compact construction is also ensured as well.

  The essential advantage, however, is the single-circuit pilot valve, which combines the aforementioned category of vehicles (with dual-circuit wheel brakes) and electronics.

  standard, dimensioned for one-circuit and -motor wheel brakes.

  already only in series So only it is possible to realize the modular concept economic, applicable as far as possible to the great diversity of commercial vehicles, with always the

  same components or complete elements.

  It goes without saying that the safety and reliability of these elements

are essential too.

  The safety and reliability of the proposed two-circuit pressure control valve 1 lies in the fact that individual elements already manufactured in series are used and that the centering center of the switching elements by the intermediate plate 4

  also eliminates the negative influence of differences due to tolerances.

  The regulation function of the intact circuit is maintained even

  in the event of failure of a braking circuit

  a two-way valve 42, mounted in the control circuit and which may be in the form of a springless ball valve, for example, ensures that the pilot pressure is taken from the intact braking circuit and simultaneously that no pressure loss does not

  occurs to the defective braking circuit.

  The symmetrical construction shown in FIG. 3 shows, by analogy with the embodiment previously described, that it is also possible to produce a pressure control valve 60

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  to a channel, that is to say with a single channel (two outputs 62 and 63 for a wheel 61) but this pressure control valve 60 is also carried out in two circuits The selection of the pilot pressure delivered by two pilot valves 64 and 65 is carried out in the same way as in the model according to Figure 2, using a

two-way distributor 66.

  Two pressure control valves 60 of this type are required for the two wheels of an axle of the vehicle. It is seen that the number of devices for one axle is higher than in the

  case of the model according to Figures 1 and 2.

  Of course, various modifications may be made by those skilled in the art to the principle and to the devices which have just been described solely by way of nonlimiting examples, without

depart from the scope of the invention.

Claims (7)

  1 Two-circuit brake system for vehicles with a two-circuit brake valve, wheel brake cylinders, which valve is supplied by two braking circuits, and a pressure control valve, equipped with main distributors and part of an anti-lock device consisting essentially of   wheel, an electronic switching device and   electromagnetic actuators, said equipment being characterized in that the pressure control valve (1, 60) has an overall internal structure in duplicate for a   two-circuit pressure control.   Braking equipment according to claim 1, characterized in that the pressure control valve   two circuits (1, 60) is controlled by a circuit.   3 Two-circuit braking equipment according to   one of claims 1 or 2, characterized in that   control chambers (19, 20, 21) of the main distributors (7, 8, 9, 10, 11, 12) each form a volumetric chamber   common in the pressure control valve (1).   4 Dual circuit braking equipment according to   any of claims 1 to 3, characterized in that   that the pressure used for piloting is selectable by a two-way distributor (42, 66) fed by the two braking circuits (I, II).   5 Dual circuit braking equipment according to   any of claims 1 to 4, characterized in that   that the pressure control valve CL, 60) has a   median plane and a symmetrical structure; and an intermediate plate   diaire (4) is arranged in the median plane (3) and comprises channels for transmitting the pressure delivered by the pilot valves (25).   6 Dual circuit braking equipment according to   any of claims 1 to 5, characterized in that   that the pressure control valve (1) is made of two channels (two 2/2 dispensers at the outlet) to deliver two different pressures. 7 2542266   7 Two-circuit braking equipment according to a   any of claims 1 to 5, characterized in that   the pressure control valve (60) is made to a channel (a 2/2 dispenser at the exit).