DE2362315A1 - MASTER CYLINDER FOR A VEHICLE BRAKING SYSTEM WITH ANTI-BLOCK PROTECTION - Google Patents

Description

Master cylinder
for a vehicle brake system with anti-lock protection

The invention relates to a master cylinder for a hydraulic vehicle brake system, with a piston, which is shown in FIG a bore formed in a housing for generating of pressure medium pressure in one lying in front of him in the bore Pressure chamber can be advanced, an inlet opening formed in the housing, which via a normally open valve, which is closed when the piston is advanced to connect the pressure chamber to a pressure medium reservoir able, and with an outlet opening formed in the housing through which the pressure chamber can be connected to at least one wheel brake is. With master cylinders of this type, you can pressurize with or without power assistance on hydrostatisehe Way or by operating a valve device generate a source of pressurized hydraulic pressure medium controls. . .

If master cylinders of the type mentioned are combined in hydraulic vehicle brake systems, it is expedient to also install a modulating device (control device) in the system in order to be able to cancel the pressure medium pressure supplied to the wheel brake when the wheel slides (locks). "" 409828/071 U

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Such control devices usually include a modulator (Desire), with which the supply of pressure medium to Interrupt the wheel brake and then modulate (regulate) the pressure of the pressure medium in order to release the brake and to tighten again, and the one on the deceleration of the braked Rades appeals. .

Such braking systems are intricate and expensive, and it may be necessary to provide separate sources of pressurized fluid to operate the master cylinder and regulator. A considerable amount of space is required to house the bulky regulators. Usually a separate controller is required for each front brake and another additional controller is required for the rear brakes.

The invention is based on the object of creating a master cylinder of the aforementioned type which has the disadvantages mentioned do not adhere.

This task is according to the invention with a master cylinder of the type mentioned at the outset, which has an actuating device which exerts a force on the piston for advancing the same can apply, and the one on the Kolbön applied force when sliding (locking) of the wheel can be regulated with a controller.

In this way the modulation (regulation) of the brake pressure takes place by modulating (regulating) the force applied to the main cylinder piston. Is the main cylinder in a When the vehicle brake system is installed, the functions of braking, tensioning and regulating are performed by a single unit, which is smaller than the master cylinder and regulator when they are arranged separately. As a result, the installation is "with limited space relieved.

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The actuating device can apply a force directly to the piston, but advantageously has a. ! External force valve assembly with which to advance of the basket pressurized additional or external pressure medium controls. The regulator is expediently a control piston, which the master cylinder piston under the Can advance the effect of the force supplied by the external force pressure medium.

The application of external pressure fluid to the control piston can be done with a pressure medium control device that interrupts the pressure medium supply in the event of a wheel locking and able to relieve the pressure.

The master cylinder is preferably provided with a control piston in front of the control piston provided lying control room. A control opening opening into this space is connected to the external force pressure medium connected via a pressure medium control device, - in the event of a wheel lock between both sides of the Piston is able to bring about a pressure equilibrium.

Connecting the two sides of the control piston together is advantageous in that the brake pressure is reduced more quickly and less external force pressure medium is released, especially in the case of severe blocking when the pressure medium control device is pressed repeatedly.

The master cylinder piston can be part of a separate hydrostatic Master cylinder or a separate external force valve arrangement be connected to the unit consisting of the control piston and external force valve or into this is integrated. The master cylinder piston can also control the supply of external force pressure medium to the brake, so that for Performing two separate functions a single source of pressurized pressure medium can be used. The master cylinder piston and control piston are preferably separate components, but can be made in one piece.

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The master cylinder piston can be the primary piston of a tandem master cylinder be. In each master cylinder arrangement according to the invention, one, two, three or there should be more master cylinder pistons. Are multiple master cylinder pistons present, they can be parallel to each other and angularly spaced around the axis of a single external force valve arrangement be arranged around.

Each master cylinder piston can have a separate control piston be assigned so that the piston of the master cylinder brake pressures generated are individually controllable by the pressure medium control device. For two or more master cylinder pistons a single control piston can be used. This form of training is not as efficient as it does happen can that the brake pressure is released on a non-blocking Had.

The external force valve arrangement is preferably via a pedal operable and designed so that in the event of a malfunction or failure of the supply of external pressure medium, a pedal-operated Component mechanically applied to the control piston or pistons.

The external force valve assembly has a normally opened, the connection to a storage container producing (Reservoir) valve and normally closed inlet valve.

Appropriately, the pedal-operated component has an extension that after opening the inlet valve on a able to attack adjustable stop. The stop is loaded in the direction of the extension, so that at Attachment of the extension to the stop, the resistance to pedal movement in the actuation direction increases by the Overcome pretensioning force. In this way it is prevented that the driver of the vehicle "depresses" the pedal.

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The Premdkraft valve arrangement is preferably designed in such a way that that the stop is loaded by ■ external force pressure medium is, so that additional pressure in the event of failure of the external force Pedal stroke meets reduced resistance. - ·

The invention also relates to a hydraulic one Anti-lock braking system, with a master cylinder of the the type described above, a facility with which to The brake applies a force to the master cylinder piston can apply, a control device to regulate the on the force applied to the piston, and with a blocking sensor device for actuating the control device.

The main cylinder is advantageously operated at the same time a pressurized pressure medium, and the control device is designed so that it is the pressure medium able to cancel applied force. .

Preferably, a control valve is used to control a connection between chambers at opposite ends of a control piston are arranged, softening the master cylinder piston able to apply. Normally, pressurized pressure medium is fed into the brake to tension the brake chamber arranged behind the piston. When blocked the control valve comes into action to connect the two chambers with one another and in this way the control piston reduce the force applied in the actuating direction. -. ,

The invention is explained below with reference to schematic drawings of several exemplary embodiments with additional details explained. In the drawing shows;

Fig. 1 in a schematic representation of a part of a Master cylinder with a solenoid operated Control valve,,

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FIG. 2 shows a section along the line 2-2 in FIG. 3 through a modified embodiment,

Fig. 3 is a section along the line 3-3 in Fig. 2,

FIG. 4 shows a section through part of the in FIG

illustrated master cylinder in partially actuated , State,

5 shows a section along the line 5-5 in FIG. 6 through a further embodiment,

6 shows a section along the line 6-6 in FIG. 5,

7 shows a section similar to FIG. 5 at partially actuated master cylinder,

8 and 9 show a longitudinal and a cross section through a another embodiment of the master cylinder,

Pig. IO a longitudinal section through a further embodiment,

1.1 and 12 a longitudinal and a cross section through another form of training,

13 shows, in section, part of the master cylinder shown in FIGS. 11 and 12 in a modified form; and

14 shows a longitudinal section through a further exemplary embodiment. ·

In the schematic representation of FIG. 1 of the master cylinder actuated with an external or additional force, 1 is indicated Housing referred to in which a longitudinally extending Bore 2 is formed. In this one works

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Modulator or control piston 3 »which on a main piston 4 acts to move in one in the bore 2 in front of the main piston 4 lying pressure chamber 5 to put pressure medium under pressure. Of the Pressure chamber 5 is connected to the brakes via an outlet opening 6. at least one vehicle wheel and a valve 8 with axially movable closure member to a pressure medium storage container 7 can be connected. The valve 8 is normally in an open, retracted position by a return spring 9 held, the main basket via a connecting rod 10 4 and thus the valve 8 in a retracted position. Holds position. A return spring assigned to the control piston 3 11 is accommodated in a chamber 12 connected to a container.

In a separate housing part 13 is one in the longitudinal direction extending bore 14 formed in which a piston 15 operates. The bore 14 is aligned with the bore 2 and stands with this via a chamber 16 with a reduced diameter in connection. The piston 15 has an axial extension 17. which has an opening in a wall of the Chamber 16 forming closure 18 penetrates and with her the outer end protrudes into the chamber 16.

At its rear end, the bore 14 opens into an annular chamber 19 with a considerable diameter, the axis of which is radially offset from that of the bores 2 and 14. An axially movable push rod 20, which penetrates a central opening in the rear wall of the housing part 13, can be advanced by actuating a pedal. At its inner end it carries a circular plate 21 _r which is provided with a radially arranged projection 22 extending in the axial direction. At the free end of the projection 22 a valve head or closure member 23 is formed which engages a complementary seat 24 which is formed in the piston 15 at the rear end of a channel 25 which establishes the connection between the bore 14 and the chamber 19. Normally; is the closure member 23 against the seat 24 with an Eücksteli'f'e'der ~ "26 ■"'-"·-"' ■■

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urged, which engages the closure member 23, so that the connection between an inlet opening 27 which is connected to a hydraulic accumulator 28 supplied by a high pressure pump 29 is, and the chamber 19 is interrupted. In this position the rear surface of the plate 21 rests on the shaft a spring-loaded, tiltable closure member 30 to to hold this in an open position, so that the chamber 19 via an outlet opening 32 with a storage container 31 in Connection is from which the high pressure pump 29 sucks pressure medium.

The chamber 19 communicates with the chamber 16 via channels 33 and 34, between which a pressure relieving device in the form of a solenoid operated valve assembly 35 is installed. The solenoid operated valve assembly 35 includes two axially spaced seats 36 and 37 and a locking member in the form of a locking ball 38, which can be brought into contact alternately on the seat 36 and on the seat 37 is. Usually the locking ball. 38 from a spring 39 pushed into contact with the seat 36, so that the channels 33 and 34, and so that the chambers 19 and 16 are in communication with one another. ■

A magnet armature 40 is housed in the housing of the valve arrangement, which, when a magnetic coil 41 is excited, the locking ball 38 disengages from seat 36 and engages pushes at the seat 37. In this operating state, the chambers 19 and 16 and the chamber 16 are separated from one another is connected to the storage container 31 via an outlet opening 42, which is connected at its inner end to the seat 36 in connection.

In operation, by operating the pedal, the plate 21 is advanced to first disengage it from the shaft to bring the closure member 30, das.sich then closes under the action of the spring bias. Through, more movement the plate 21 in the same direction becomes the locking member

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pushed away from the seat 24, so that standing under high pressure Pressure medium flows into the annular chamber 19. This is then passed on to the chamber 16 in order to reach the control piston 3 act and advance this and the main piston 4. to The valve 8 becomes the start of the movement of the main piston 4 closed. Oanach becomes by further movement of the head ^ - piston 4, the pressure medium located in the pressure chamber 5 is pressurized and hydraulic via the outlet opening 6 Actuating devices (hydraulic wheel brake cylinders) for Actuation of the wheel brakes of the vehicle supplied.

If the braked wheel approaches the state of beginning wheel sliding or wheel locking, a Blocking sensor device 43 energizes the magnetic coil 41, which, as described above, the magnet armature 40 advances in order, by pressing the locking ball 38 against the seat 37, to supply pressure medium to the chamber 16 to interrupt and at the same time the chamber 16 for pressure relief at. to connect the reservoir. The pressure prevailing in the pressure chamber 5 then causes the main piston returns to a withdrawn position. In this way the pressure in the pressure chamber 5 is reduced and the pressure applied to hydraulic actuators is reduced.

When the magnet coil is de-energized, the locking ball 38 by the pressure of the pressure medium in the channel 33 and the force the return spring 39 away from the seat 37 to rest on the seat 36 ' pushed. In this way, the brakes are automatically re-applied as described above. :

In the event of a malfunction or failure of the high-pressure source, the Braking by directly engaging the free end of the Extension 17 on the control piston 3 can still be tightened.

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The invention has the advantage that all components of the master cylinder are in constant motion, so that there is no risk of any component at the required moment \he says. For example, the piston 15 moves in the Bore 14 when its two sides are subjected to the same pressures, since the effective area of the piston 15 on the Annular chamber 19 facing side is larger than that on the opposite side, which is the difference between the total area of the piston 15 and the area of the "extension 17" results.

The external power support is also already after one relatively small pedal stroke effective. In the event of a malfunction or failure of the high pressure supply, the pedal only needs to be changed to be moved a very small amount.

The brake pressure can be reduced relatively quickly, since the pressure prevailing in the chamber 16 is completely reduced to the Reservoir can be removed.

In the modified embodiment shown in FIGS of the master cylinder, the tiltable locking member 30 is omitted and the circular plate 21 is on a shaft 44 displaceable in the axial direction is coupled. This has a locking link 45 »at its free end. which engages a seat 46, which at the inner end of a centrally arranged in the housing 1, extending in the axial direction Bore 47 is formed. The outer end of the bore 47 is via an external connection 48 to the supply ' container 31 connected. Normally, the closure member is at a distance from the seat 46, so that the annular chamber 19 is in communication with the storage container 31.

When the main cylinder is actuated, the locking member 45 comes on to rest on the seat 46 in order to interrupt the connection between the storage container and the annular chamber 19. After that, will

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by further moving the circular plate 21 in the same direction, the closure member 23 is urged away from the seat 24, so that pressurized pressure medium can flow into the annular chamber 19 from the high pressure source 28.

The pressurized located in the annular chamber 19 Pressure medium can pass through each of three solenoid operated valve assemblies 35 into a separate chamber 16 are introduced, which is formed behind each of three control pistons. The control piston 3 work in one of three bores 2 formed in the housing, which are constant at an angular distance from one another on a pitch circle Diameter are arranged, the center of which forms the hole. The outlet opening 6 of each pressure chamber 5 is connected to a other wheel brake connected. Preferably at two of the outlet openings with brakes on different front wheels a vehicle and the remaining outlet opening 6 is connected to both rear brakes.

When the main cylinder is actuated, the three pressure chambers supplied brakes tensioned at the same time. The history of the braking process on each brake is affected by this Brake associated solenoid-operated valve assembly 35 modulated or regulated by the chamber 16 under high Pressurized pressure medium is supplied. From the representation in Fig. 4 can be seen, for example, that the in the. Drawing bottommost outlet opening 6 supplied The brake is actuated, but that the pressure normally emitted via the uppermost outlet opening 6 in the drawing is reduced has been due to the actuation of the solenoid controlled Valve assembly 35, which in turn is responsive to the deceleration of the associated wheel.

The structure and mode of operation of the embodiment shown in FIGS. 2 to 4 are otherwise the same as in the exemplary embodiment corresponding to FIG. 1. Corresponding to one another Components are denoted by the same reference numerals.

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That in Pig. The embodiment shown in 2 to 4 has the advantage that there are several master cylinders for actuation Another wheel brake can be combined in a single unit with pressure regulating devices that operate automatically and Independent of the pedal control, the actuation of each brake according to the deceleration of the respective brake the braked wheel.

In Fig. ■ 5 Ms 7, which is a modified form of the Show master cylinder are corresponding components denoted by the same reference numerals. The circular plate 21 forms a working in a bore of the housing 1 Piston and has a circumferential flange 50 extending in the axial direction. The chamber 19 stands over an im Piston 21 formed opening 52 with a chamber 51 in connection.

The connection between the chamber 51 and the source 28 of pressurized hydraulic pressure medium is with a normally closed valve assembly 53 with tiltable Closing member controllable. In the in Pig. 5 shown In the normal rest position, the puddle 50 is at a distance from the shaft of the tiltable closure member of the valve arrangement. These is thus closed and the chamber 51 is arranged in the middle in the housing 1, extending in the longitudinal direction Bore 47 with the pressure medium storage container 31 connected, since the closure member 45 carried by the axially displaceable shaft 44 is located at a distance from the seat 46.

Each of the main pistons 4 is formed with a stepped outline and works in a section of the longitudinal bore 2 designed with complementary steps. The control pistons 3 act on the ends of the main pistons 4, which are smaller in area. The pistons 15 are in the likewise stepped control pistons 3 incorporated.

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The pressure chamber 5 is in the bore 2 from the outer end of the Main piston 4 and bounded by a plug 54 ″ which closes the end of the bore. Each pressure chamber 5 is normally Connected via an axial channel 55 in the plug 54 to a second pressure medium storage container. The connection between a second high pressure source and the pressure chambers can be controlled with separate valve arrangements 56 with tiltable closure members. In one shown in FIG In the normal, retracted rest position, the valve assemblies 56 are closed. In this position, the pressure chambers 5 are connected to the second reservoir and each of the valves 8 coupled to the main piston 4 with an axially displaceable closure member is in an open position held.

If the master cylinder is actuated via the pedal, it comes Closure member 45 to rest on seat 46, and the connection to interrupt between the reservoir and the chamber 51. Thereafter, with further movement of the piston 21 in the same direction, the valve arrangement 53 is opened with the tiltable closure member, so that pressurized pressure medium can flow into the chamber 51 from the high pressure source 28.

The pressurized pressure medium located in the chamber 51 can flow through any of the three solenoid-operated valve arrangements 35 flow through into the separate chambers 16 which are each formed behind each of the three control pistons 3 are. The control pistons 3 each work in one of the three formed in the housing 1, angularly spaced around the bore 4.7 holes arranged around.

From the illustration in Pig. 7 it can be seen, for example, that the outlet opening 6 at the top in the drawing supplied brake is actuated, but that via the in the drawing bottommost outlet opening 6 normally discharged

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Pressure has been reduced due to the actuation of the solenoid-operated valve assembly 35, which in turn opens the beginning sliding or blocking state of the associated Rades appeals. Structure and mode of operation of the Pig. 5 to illustrated embodiment are otherwise the same as in the embodiment according to FIGS. 2 to 4.

The one in Pig. 8 and 9, the main change relates to the structure and the modified embodiment shown Mode of operation of the control piston 3. Instead of a piston, the gradation of which creates a pressure chamber 16 behind the piston results (Pig. 5 to 7) a piston is used which is stepped in such a way that a pressure space 60 results in front of the piston. The piston 3 engages with a smaller diameter, a seal 62 penetrating part 61 on the main piston 4 and carries a seal 64 on its larger diameter part 63. From the larger diameter part one goes to the rear Extension 65 reduced in diameter and penetrates through a sealing arrangement 66 into the chamber 51 a.

The chamber 51 has one controlled by the inlet valve 53 Premdfcraft inlet opening 67 and an outlet opening 68, via the solenoid-operated control valve (not shown) 35 to a control opening opening into the pressure chamber 60 69 can be connected. The connection between the chamber 51 and the pressure space 60 is normally through the sail valve 35 interrupted, which normally connects the pressure chamber 60 with the reservoir. In this modified embodiment, the master cylinder is made up of two main parts composed, namely of a master cylinder block 70 with three hydrostatic main cylinders and one designed with a tiltable closure member, to the storage container leading valve 8, and from a unit 71 with Premdkraft valve and control device. The two main parts are screwed together with screws 72.

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In operation, by forward movement of the pedal-operated component (push rod) 20, the valve 45 connected to the storage container with an axially movable closure member is closed and the inlet valve 53 is opened so that pressurized pressure medium can flow into the chamber 51: The pressure of the pressure medium acts onto the exposed ends of the extensions 65 of the control pistons 3> which are thereby moved forward and in turn advance the master cylinder pistons 4 to tension the brakes. In the event of sliding, a sensor attached to one of the vehicle wheels sends a signal to the associated solenoid-operated control valve 35, which interrupts the connection between the pressure chamber 60 and the reservoir and connects the chamber 51 with the pressure chamber 60, so that the pressure above the control piston is balanced. By appropriate selection of the diameter of the piston parts 61, 63 and 65, the external force pressure medium can load the control piston with an excess of force in the rearward direction. The control pistons therefore go back and allow the brake pressure to be reduced. As soon as the blocking signal is canceled, the pressure chamber 60 is reconnected to the reservoir and the brakes are applied again.

Fig. '10 shows a further modified embodiment of ^one of the master cylinder, wherein the hydrostatic master cylinder block 70 in three tandem master cylinder are formed. The master cylinder block 70 is screwed to a part 73 of a two-part housing of the external force valve unit 7T. Each tandem master cylinder is provided with the primary piston 4, which actuates a valve 8 with a tiltable closure member connected to the storage container, and with a secondary piston 74, which acts on a central valve 75 connected to the storage container.

The outlet openings for the primary and secondary pressure chambers 5 and 76 are not drawn.

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As in the embodiment according to FIGS. 8 and 9 the chamber 51 facing away from a recess in the master cylinder End of the housing part 73 is formed. At the base of the recess is a retaining plate 77 for the seal assembly 66 and acts as a stop for the control piston 3 · Between the piston seal 64 and the Sealing arrangement 66 leads off a relief channel 78.

The other end of the chamber 51 is formed by a second housing part 79, in whose axially directed through-hole 80 the pedal-operated component (push rod) 20 is working. The radial splash 21 can do that to the reservoir connected valve 45 and the external force inlet valve 53 to operate below or above the Bore 80 are arranged. The valve 45 is urged into the closed position by spring force, but normally from the Flange 21 held in the open position. The inlet valve 53 is urged into the open position by spring force, however normally held in the closed position by the flange 21.

In normal operating conditions, the reservoir valve 45 is opened by advancing the pedal-operated component 20 closed and the inlet valve 53 opened, so that external force pressure medium can flow into the chamber 51 to the To push the control piston forward. These in turn push the primary piston 4 forward. The control valve acts in sliding states or effect the control valves 35, as in the exemplary embodiment corresponding to Pig. 8 and 9 that the pressure of the pressure medium is balanced over the or the control piston and that the or each piston goes back, whereby the of the Brake pressure applied to the master cylinder piston can be reduced. If the external power pressure fails, the flange 21 comes off to rest on the control piston in order to act upon it mechanically. If necessary, one control valve can be used for two or control more control pistons.

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.Fig. 11 and 12 show a further development of the one shown in FIG. 10 shown aggregate. Corresponding components are denoted by the same reference number ". With the external force valve unit 71 three separate, 'individual master cylinders 81 are screwed together.

The main difference is "that the external force inlet valve 53 here with an axially movable closure member is formed, which can be actuated with a rod 82 protruding from the pedal-actuated piston 20. The valve points an adjustable stop 83, which is in an axis-: direction extending blind bore 84 is arranged. The one on the side of the housing facing the main cylinders. partly 73 open end of the blind bore 84 is with a Threaded plug 85 closed, in which the external force inlet opening 67 is formed. An existing one in stop 83 axial channel 86 is aligned with an axial channel 87 formed in the housing and leading to recess 51, into which the rod 82 penetrates. One reduced in diameter axial extension 88 of the rod 82 penetrates the channel 86 and is able to actuate the valve 53, which by spring force is pushed into the closed position. ·

In the end face of the stop .83 * facing the base of the blind bore 84, one is provided with seals on each side annular recess 89 formed, which via a Inner channel 90 is connected to the relief channel 78. The stop 83 is usually from a light spring 91, urged against the base of the blind bore 84.

In this form of training, the. Flange 21 replaced by a perforated plate 92, "which is received on the rod 82 and attached to a curved shoulder 93 of the component 20 is held in abutment by a spring 94, which is attached to the perforated plate 92 and a holding element 95 attached to the rod.

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The mode of action of this form of training is the same. -.-how "in the example shown in Pig. 10, except that the blind bore 84 is normally completely filled with external force pressure medium, so that if after opening the Inlet valve 53 through the rod extension "88 the rod 82 attacks the stop 83, another. Forward movement of the pedal-operated member 20 of the between the two Seals lying surface of the stop acting pressure of the external force pressure medium counteracts. Through this excessive pedal movement is prevented. If the external force pressure fails, the counterforce of the spring 91 easily overcome to move the pedal the additional amount required to clear the perforated plate 92 to be brought into contact with the control piston 3. The perforated plate can tilt at the shoulder 93 to reduce the pressures in the Balance master cylinders.

The reservoir valve 45 in the Pig. 13 shown Form of training is also with axially movable closure member executed. The axial channel passing through the stop 83 is formed by two axially directed channels lying opposite one another Blind holes 96 and 97 replaced. The blind bore 96 opens into the channel 87 formed in the housing and is connected to the annular recess 89 via a channel 98. you open end forms a seat 99 for a closure member 100, which of one in a recess iO2 in the end of the Rod 82 housed spring 101 is loaded.

The external force inlet valve 53 also has a slightly modified design. The actuator of the valve is a head pin 103, of two in the stop 83 slidable guided push rods 104 is displaceable. The channel 97 in the stop 83 is permanently connected to the channel 87 formed in the housing via an inclined bore 105.

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In operation is activated by moving the pedal forward Component 20, the closure member 100 to rest on the seat 99 brought to interrupt the connection between the chamber 51 and the reservoir. Further movement of the component 20 compresses the valve spring 101 until the end the rod 82 engages the push rods 104. These come in turn to rest on the head pin 103, whereby the inlet valve 53 is opened, so that pressurized pressure medium can flow into the chamber 51 via the channels 97, 105 and 87.

The main cylinder in the in Pig. 14 is similar to the embodiment shown in FIGS. Corresponding components are identical Reference numerals denoted. In the example shown, the master cylinders 81 are cylinders with only one pressure chamber executed, the valves 8 connected to the reservoir being formed by piston seals. The main difference consists in the fact that the external power reservoir connected valve 45 with an axially movable Closure member is provided, but not so closely with the The inlet valve is connected as in the exemplary embodiment according to FIG. 13.

In. Fig. 14 can be seen that the piston rod 82 in the pedal-operated component 20 is screwed in and has an end piece 106 of reduced diameter. One the Axial channel 107 passing through the rod 82 communicates with the bore 80 via radial channels 108, which are connected via a through the housing part 79 leading channel 110 with a opening IO9 connected to the reservoir is connected. The end of the channel 107 located in the rod end piece 106 forms a seat 111 for a closure member 112 which is guided in the channel 87 of the housing part 73. A radial flange 113 formed on the closure member 112 is normally held by a spring 115 in contact with a cage 114, the from the holding plate 77 for the sealing arrangement 66 on Housing part 73 is held.

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In operation, by advancing the rod 82, the Seat 111 brought to bear on the closure member 112 and thereby the connection with. interrupted the reservoir. Further Forward movement of the rod 82 presses the each 115 together until the closure member 112 actuates the inlet valve 53. Under normal conditions, the pedal movement is stopped as soon as the closure member 112 is at the end of the channel 86 in the Stop 83 comes to rest.

/ Claims 409828/0714

Claims (18)

Master cylinder for a brake system with block! which also has a brake for a vehicle wheel and one that generates a signal when the braked wheel is locked Blocking sensor device include, with a piston, which is in a bore formed in a housing for generating is displaceable by pressure medium pressure in a pressure space lying in front of it in the bore, one formed in the housing Inlet opening, which is via a normally open valve that closes when the piston is advanced is able to connect the pressure chamber with a pressure medium storage container, an outlet opening formed in the housing, through which the pressure chamber can be connected to the wheel brake, and to an actuating device on the piston able to apply a force for advancing the same, characterized in that the on the piston (4) applied force when sliding (locking) of the wheel can be regulated with a controller (3). 2.. A master cylinder according to claim 1, wherein the actuating means includes an external force valve assembly adapted to apply a force advancing the piston Pressurized external force pressure medium controls, thereby marked Ine t that the controller (3) through the external force pressure medium regulates the force applied. 3. Master cylinder according to claim 2, characterized in that the regulator (3) is a control piston, which works in a second bore and the master cylinder piston (4) able to advance, with the external force. Valve arrangement (23,30; 45,53) is designed so that it 40 9 8 287 071 ^ S ^{? V} - · -Sf- 44 111 for advancing the control piston (3) with external pressure medium applied. 4. Master cylinder according to claim 3 »thereby g e k e η η - ζ e i without t that the application of external force pressure medium to the control piston (3) with a pressure medium control device (35) takes place, which is dependent on one of the Blocking sensor device (43) emitted signal from the External force pressure medium generated pressure is reduced. 5. Master cylinder according to claim 3, characterized in that g e k e η η, that a control opening formed in the housing (71) - (69) in front of the control piston (3) in the second Bore opens and to the external force pressure medium acting on the control piston (3) via a pressure medium control device (35) can be connected which, depending on a blocking signal, both sides of the control piston (3) able to connect with each other. 6. Master cylinder according to claim 5, characterized in that g e k e η η - shows that the control piston (3) is stepped is and a smaller diameter part (61), which is able to engage on the master cylinder piston (4), one in diameter larger part (63) which delimits a control space (60) in the second bore, which is connected to the control opening (69) is connected, and a central part in diameter (65), which protrudes from the larger diameter part (63) to the rear and can be acted upon by external force pressure medium pressure is, the annular area of the in diameter larger part (63) is smaller than the area of the im Middle part diameter (65). 7. Master cylinder according to claim 5 or 6, characterized gek ennz e i chne t that a pressure medium control device (35) establishes a connection between the control opening (69) and the control piston (3) acting on the external force pressure medium controls and on one of the blocking sensor device (43) responds. 409828/07 14 - Ϋ- 44 111 8. Master cylinder according to one of claims 1 to 7, characterized gek e η η ζ e ichne t that a plurality of master cylinder pistons (4) is present. 9. Master cylinder according to one of claims 2 to 8, characterized marked that the external force valve arrangement (23,3Oj 45,53) a pedal operated valve actuator (20), with which the master cylinder piston (4) in the event of a malfunction or failure of the supply of external pressure medium is mechanically actuated. 10. Master cylinder according to claim 9, characterized in that g e k e η η - ■ ζ e i c h η e t that the pedal-controlled actuator (20) after actuating the valve arrangement (45,53) on an adjustable one Stop (83) can be brought to bear, and that the stop (83) of a loading device (91) in the direction is pushed towards the pedal-operated actuator (20), wherein the pedal movement counteracts increasing resistance when overcoming the loading device (91). 11. Master cylinder according to claim 10, characterized in that g e k e η η ζ e i c.h η e t that the loading device (91) is supported by external force pressure medium, so that in the event of a fault or failure of the supply of external pressure medium, the pedal movement is counteracted by a reduced resistance. 12. Master cylinder according to claim 11, characterized in that the external force valve arrangement (45,53) an energy chamber (51), an inlet valve (53) for controlling the pressure medium flow into the energy chamber (51), and an outlet valve (45) for controlling the pressure medium flow from ' the energy chamber (51), the inlet valve (53) controlling pressure medium flow through the stop (83). / 4 409828/071 U - if -. 44 111 13. Master cylinder according to claim 12, characterized in that the inlet valve (53) and the outlet valve (100; 111) an axially movable closure member (83; 112) is common. ■ 14. Braking system with anti-lock protection with a wheel brake for a vehicle, a master cylinder in which a piston can be advanced in a bore formed in a housing is to generate hydraulic pressure medium pressure in a pressure chamber located in front of the piston in the bore, the Pressure chamber via a normally open valve, which is closed when the piston is advanced, to a pressure medium storage container and is connected to the wheel brake, an actuating device with which the piston to tension the brake can be applied with a force, and with a blocking sensor device that when sliding (Blocking) the wheel emits a signal, characterized in that a control device the force applied to the piston (4) as a function of one output by the blocking sensor device (43) Signal regulates. 15. Brake system according to claim 14, in which the actuating device comprises an external force valve arrangement which controls the pressure medium under pressure from a source regulates the pressure of the external force pressure medium output, characterized in that the regulating device has a Control piston (3) which is able to advance the master cylinder piston (4) with a force that is generated by the external force pressure medium is applied, the master cylinder piston (4), the external force valve assembly (23,30; 45,53) and the Control piston (3) are combined into a single master cylinder unit. / 5 09828/0714 - if - 44 111 16. Brake system according to claim 15 »characterized by ge k e η η, that the control device also includes a pressure medium control device (35), which the on Control piston (3) force applied by the external force pressure medium as a function of one of the blocking sensor device (43) regulates the output signal. .17. Brake system according to claim 16, characterized in that the pressure medium control device (35) is a control valve which is connected between the external force valve arrangement (23,30; 45,53) and the control piston (3) and able to interrupt the supply of external force - D back with 1AL - to the control piston (3) and reduce the pressure of the pressure medium acting on the control piston (3). 18. Brake system according to claim 16, characterized in that g e k e η η, that the pressure medium control device (35) is a control valve which is a connection between the two Both sides of the control piston (3) controls and the pressure on both Capable of compensating piston sides. 40982070714 Blank page