WO2020048697A1 - Piston device for an electropneumatic modulator for a vehicle, piston system, modulator and method for producing a piston device - Google Patents

Abstract

A piston device (115) for an electropneumatic modulator (105) for a vehicle (100) has a first piston element (125), a second piston element (130) and at least one sealing element (135). The first piston element (125) is shaped such that it can be arranged in a piston housing (120). The second piston element (130) is shaped such that it can be arranged in the piston housing (120) and, in an installed state, is coupled to the first piston element (125). The sealing element (135), in the installed state, is arranged between the first piston element (125) and the second piston element (130) in order to seal off a first region (140), which adjoins the first piston element (125), of the piston housing (120) with respect to a second region (145), which is situated opposite the first region (140) and which adjoins the second piston element (130), of the piston housing (120) when the piston device (115) is arranged in the piston housing (120).

Description

 DESCRIPTION

Piston device for an electropneumatic modulator for a

Vehicle, piston system, modulator, and method of making a piston device

The present approach relates to a piston device for a

electropneumatic modulator for a vehicle, a piston system with a

Piston housing and a piston device, an electropneumatic modulator and a method for producing a piston device.

Piston systems in electropneumatic modulators have a piston housing, one accommodated in the piston housing and one in the piston housing

movable piston and a seal that seals a space between the piston housing and the piston.

DE 101 33440 A1 describes a brake system with an electropneumatic modulator for providing a brake pressure for a brake cylinder of the

Vehicle.

Against this background, the object of the present approach is an improved piston device for an electropneumatic modulator for a vehicle, a piston system with a piston housing and an improved piston device, an improved electropneumatic modulator and a method for

To create an improved piston device.

This object is achieved by a piston device for an electropneumatic modulator for a vehicle, a piston system with a piston housing and a piston device, an electropneumatic modulator and a method for producing a piston device according to the main claims.

A piston device according to the approach presented here has the advantage that one or more sealing elements can be assembled very easily and after assembly are still recorded safely. In addition, the piston device

are advantageously accommodated and operated in a piston housing which does not require any recess or groove for the sealing element or elements. This simplifies the manufacture of the piston housing.

A piston device for an electropneumatic modulator for a vehicle has a first piston element, a second piston element and at least one

Sealing element on. The first piston element is designed to be arranged in a piston housing. The second piston element is also designed to be arranged in the piston housing and is coupled to the first piston element in an assembled state. In the assembled state, the sealing element is arranged between the first piston element and the second piston element in order to seal a first region of the piston housing adjacent to the first piston element from a second region of the piston housing opposite the first region and adjacent to the second piston element when the piston device in the

Piston housing is arranged.

The vehicle can be a commercial vehicle or a vehicle

Act passenger transportation. The vehicle can be an electropneumatic

Have brake system, which can include an electropneumatic modulator. The piston device can be a linearly movable reciprocating piston in the piston housing, or in other words. Such a piston is also referred to as a relay piston. The piston device can have an axial opening or through opening into which, in the assembled state of the piston device, a centering element for guiding a linear movement of the

Piston device can be inserted. The piston device can be shaped for use in or with an electropneumatic modulator for a vehicle. In the assembled state, the sealing element can be arranged between a surface of the first piston element and a main surface of the second piston element. A main surface is to be understood as a surface that is the largest surface compared to other possible surfaces of an element.

For example, the sealing element can be in contact with both the first piston element and the second piston element in the assembled state. The The assembled state is said to be an operational state of the piston device

understand, that is, a state in which the piston device can be moved or operated in the piston housing. In the assembled state are the first

Piston element and the second piston element coupled to each other and that

Sealing element is arranged between the first piston element and the second piston element. The sealing element can be placed between the first piston element and the second piston element, or it can be arranged or injection molded or injected. A sealing element arranged in this way between the first piston element and the second piston element, which is also referred to as a piston seal, can advantageously be arranged on the piston device so that it does not slip. The first area of the piston housing can also be referred to as the working chamber and the second area of the piston housing can also be referred to as the control chamber.

The first piston element and the second piston element can be detachably coupled to one another in the assembled state. So the sealing element can be easily replaced. For example, the first piston element can be at least one

Fastening element can be positively and additionally or alternatively positively coupled or coupled to the second piston element. Subsequent replacement of the sealing element can thereby be facilitated, for example.

Additionally or alternatively, the first piston element and the second

Piston element can be coupled or coupled to one another by means of a bayonet connection and additionally or alternatively by a snap lock. A

Bayonet connection can enable a detachable connection. The

Snap lock can allow a permanent, i.e. non-detachable or detachable connection.

Alternatively, the first piston element can be integrally coupled or coupled to the second piston element. A material connection, for example a weld, can enable a particularly stable connection.

A connection point of the second piston element at which the second

Piston element with the first piston element is coupled or can be coupled, in the middle be arranged on or through a main surface of the second piston element. This enables a force-free transfer of force between the two piston elements.

According to one embodiment, the first piston element has a cutout for the sealing element. This cutout can be integrally formed in an outer wall and additionally or alternatively an upper side of the first piston element facing the second piston element in the assembled state. A cross section of the recess can be concave or L-shaped. A sealing element in the form of an O-ring can advantageously be arranged in such a recess. Here, the O-ring can be on or around a center in the circumferential

Cutout created or be raised. For example, the O-ring can be placed on a shoulder formed on the base of the elevation. This creates a form-safe arrangement of the sealing element on the first piston element.

The second piston element can have an annular shape. This saves material for the second piston element. In the assembled state, the second piston element can be coupled to the first piston element on an elevation surface of said elevation of the first piston element. The second

Piston element can protrude from the elevation surface in order to hold the received sealing element. A first volume of the first

Piston element can be larger than a second volume of the second

Piston element.

According to one embodiment, an outer diameter of the sealing element essentially corresponds to one, that is to say that an adequate seal is achieved

Outside diameter of the first piston element and additionally or alternatively an outside diameter of the second piston element and additionally or alternatively an inside diameter of the piston housing. The mentioned diameters can be perpendicular to a direction of movement of the piston device during operation

Piston device be thought to run. As long as the piston device is not arranged in the piston housing, the

Outside diameter of the sealing element may be larger than the outside diameter of the first piston element and additionally or alternatively the outer diameter of the second piston element and additionally or alternatively the inner diameter of the piston housing. This can ensure that there is a gap between the

Piston device and the piston housing is sealed by the sealing element when the piston device is arranged in the piston housing.

Additionally or alternatively, the piston device can have at least one other

Have sealing element, which can be shaped according to one of the variants of the sealing element described above, wherein an outer diameter of the further sealing element can be smaller than the outer diameter of the

Sealing element. The first piston element can also have a further recess for the further sealing element. This cutout can be formed all the way round into an inner wall of the first piston element and additionally or alternatively the upper side of the first piston element facing the second piston element in the assembled state. The further sealing element can thus also be arranged between the first piston element and the second piston element in the assembled state. If the piston device is arranged in the piston housing in the operational state, the first piston element can be on a pin-shaped or sleeve-shaped

Centering element of the piston housing can be arranged guided. The further sealing element allows one between the centering element and the first

Piston element located gap are sealed.

It is also advantageous if the piston device has at least one

Has piston passage opening, which extends in the assembled state through the first piston element and the second piston element in order to fluidly connect the first region to the second region. During an operation of the

Piston device in the piston housing can thus enable pressure equalization between the first region and the second region. Through the

Piston passage opening can be used as a throttle.

Additionally or alternatively, the first piston element can have at least one first

Have through opening to the first region fluidly in the assembled state with a between the first piston element and the second piston element arranged to connect intermediate volume space. The second piston element can have at least one second through opening in order to fluidly connect the second region to the intermediate volume space in the assembled state. Pressure equalization can be controlled through such an intermediate volume space. According to one embodiment, the intermediate volume space can represent a timing element. A speed of pressure equalization can be determined by a size of the

Intermediate volume space can be determined. The larger the intermediate volume space, the greater the delay in pressure equalization. A volume or diameter of the intermediate volume space can therefore advantageously be larger than a volume or diameter of the first through opening and additionally or alternatively a volume or a width of the second through opening.

A piston system has a piston housing and one in the piston housing

arranged piston device, which is formed in one of the variants described above. Such a piston system is suitable for use with or in an electropneumatic modulator. The piston system is

advantageously very easy to assemble. The piston housing can be tubular, for example with a circumferential or uniform tubular inner tube wall. A recess or groove for the sealing element is advantageously not necessary in the piston housing. Such a piston system shows little wear during operation.

An electropneumatic modulator for a vehicle has a control input for receiving a control signal, a supply connection for supplying compressed air, a brake output for outputting a brake pressure and the like

Piston system, which is connected between the supply port and the brake output, with a piston position of the piston device within the

Piston housing is controllable by the control signal to provide the brake pressure using the compressed air.

A method for manufacturing a piston device for an electropneumatic modulator for a vehicle has a step of providing, a step of coupling and a step of arranging. In the step of deploying a First piston element, which is designed to be arranged in a piston housing and a second piston element, which is designed to be arranged in the piston housing. In the coupling step, the first piston element is coupled to the second piston element. In the step of arranging, at least one sealing element is arranged between the first piston element and the second piston element, around a first region of the piston housing which is adjacent to the first piston element and opposite a region of the first region and the second region

Seal the piston adjacent the second region of the piston housing when the piston device is arranged in the piston housing.

The arranging step can be carried out before or after the coupling step.

Exemplary embodiments of the approach presented here are explained in more detail in the following description with reference to the figures. Show it:

Fig. 1 is a schematic representation of a vehicle with an electropneumatic modulator with a piston system with a piston device according to a

Embodiment;

2 shows a schematic cross-sectional illustration of one half of a piston device according to an exemplary embodiment;

3 shows a schematic illustration of a throttle of a piston device according to an exemplary embodiment;

4 shows a schematic illustration of two throttles of a piston device according to one exemplary embodiment;

Fig. 5 is a schematic cross-sectional view of an electropneumatic

Modulator with a piston system with a piston device according to one

Embodiment; and 6 shows a flowchart of a method for producing a piston device according to an exemplary embodiment.

In the following description of favorable exemplary embodiments of the present approach, the same or similar reference numerals are used for the elements shown in the various figures and acting in a similar manner, and a repeated description of these elements is omitted.

1 shows a schematic illustration of a vehicle 100 with a

electropneumatic modulator 105 according to an embodiment. By way of example only, vehicle 100 is a commercial vehicle, for example a truck. According to this exemplary embodiment, the electropneumatic modulator 105 is part of a brake system of the vehicle 100. The electropneumatic modulator 105 comprises a piston system 110 with a piston device 115 and a piston housing 120. The piston housing 120 is, for example, by

Parts of a housing of the electropneumatic modulator 105 are formed. According to this exemplary embodiment, only one half of the piston system 110 is shown. As indicated by an axis of symmetry 122, an opposite half of the piston system 110, not shown, can be mirror-inverted

Execution be shaped according to the half shown here. A complete representation of the piston system 110 is shown in FIG. 6.

The piston device 115 has a first piston element 125, a second

Piston element 130 and at least one sealing element 135. The piston device 115 is shown in an assembled state in which the first piston element 125, the second piston element 130 and the sealing element 135 form a piston

are put together. In the assembled state, the sealing element 135 is arranged between the first piston element 125 and the second piston element 130, in order to surround a first region 140 of the first piston element 125

Piston housing 120 opposite a second region 145 of the first region 140 and adjacent to the second piston element 130

Seal the piston housing 120 when the piston device 115 in the

Piston housing 120 is arranged, as shown in Fig. 1. According to this exemplary embodiment, the piston device 115 also has a further sealing element 146.

According to this exemplary embodiment, the first piston element 125 and the second piston element 130 are detachably coupled to one another. Here, the first piston element 125 according to this exemplary embodiment is coupled to the second piston element 130 by means of at least one fastening element. The fastening element is designed, for example, as a screw or clip. According to one

Exemplary embodiments are the first piston element 125 and the second piston element 130 additionally or alternatively by means of a bayonet connection and / or one

Snap lock coupled together. According to an alternative

In the exemplary embodiment, the first piston element 125 is additionally or alternatively cohesively coupled, for example glued or welded, to the second piston element 130.

According to this exemplary embodiment, the first piston element 125 has a

Recess 150 for the sealing element 135. According to this exemplary embodiment, the recess 150 is formed all around into an outer wall 152 and an upper side of the first piston element 125 facing the second piston element 130 in the assembled state. A cross section of the recess 150 shown here is L-shaped in accordance with this exemplary embodiment. According to this exemplary embodiment, the sealing element 135 is shaped in the form of an O-ring and is arranged or fitted around an elevation 155 of the first piston element 125 which is formed centrally in the circumferential recess 150. According to this exemplary embodiment, the elevation 155 is cone-shaped. Alternatively, the sealing element 135 has another suitable shape, for example with at least one sealing lip. According to this exemplary embodiment, the further ring-shaped sealing element 146 is arranged parallel to the ring-shaped sealing element 135, which is shaped the same or differently than the sealing element 135. An outer diameter of the further sealing element 146 is smaller than the outer diameter of the sealing element 135. The first

According to this exemplary embodiment, piston element 125 has a further cutout 156, in which the further sealing element 145 is arranged. This further recess According to this exemplary embodiment, 156 is integrally formed in an inner wall 157 of the first piston element 125 arranged opposite the outer wall 152 and additionally or alternatively in the upper side of the first piston element 125 facing the second piston element 130 in the assembled state. According to this exemplary embodiment, the further sealing element 146 is also arranged or clamped in the assembled state between the first piston element 125 and the second piston element 130. The piston housing 120 shapes according to this

Embodiment a centering element 159 in the form of a sleeve. The

In the assembly state shown here, piston device 115 is arranged in piston housing 120, inner wall 157 being arranged all around centering element 159. In the assembled state shown here, the further sealing element 146 is designed to also seal the working chamber and the control chamber from one another on the side of the centering element 159. A gap located between the centering element 159 and the inner wall 157 of the first piston element 125 and a corresponding inner wall of the second piston element 130 is sealed by the further sealing element 146.

According to this exemplary embodiment, the second piston element 130 has an annular shape. The centering element 159 is guided through the axial through opening of the second piston element 130. According to this exemplary embodiment, a connection point 160, at which the second piston element 130 is coupled to the first piston element 125, is arranged centrally on or through a main surface of the second piston element 130 and / or centrally on or in the elevation 155 of the first piston element 125. A first volume of the first

According to this exemplary embodiment, piston element 125 is larger than a second volume of the second piston element 130. The first piston element 125 has a guide section 165 at an end facing away from the second piston element 130, which is designed to reliably guide the piston device 115 when it moves the piston device 115 along at least one side of the

To allow centering element 159 of the piston housing 120. The sealing element 135 is in the assembly state shown on the circumferential inner wall of the

Piston housing 120 on. The further sealing element 146 lies in the one shown

Installation state on a circumferential outer wall of the centering element 159. The Sealing element 135 can also be referred to as an outer sealing ring and the further sealing element 146 as an inner sealing ring.

According to this exemplary embodiment, the piston housing 120 is tubular. According to this exemplary embodiment, an inner tube wall of the piston housing 120 has a uniform, circumferential tubular configuration. The inner tube wall is without a circumferential recess, for example without a groove or groove for guiding the

Sealing element 135 executed.

In the following, exemplary embodiments of the piston device 115 are described again in other words:

The piston device 115 presented here can also be referred to as a two-part piston for an electropneumatic modulator 105. The piston system 110 advantageously realizes a piston with a seal in a housing with little wear and easy assembly.

Due to the limitation by the second piston element 130, the size of the recess 150 is advantageously always the same, regardless of a position of the

Piston device 115. The O-ring can therefore not move or can move only very slightly in the recess 150 and therefore does not wear, or only barely. According to this exemplary embodiment, the O-ring lies on a shoulder of the first piston element 125. Therefore, no further component for guiding the sealing element 135 is advantageously necessary between the piston housing 120 and the piston device 115.

Thanks to the shaping of the piston device 115 presented here, it is also not necessary to create a recess or groove in the piston housing 120 in the raw part or by machining, as a result of which a complicated tool geometry or unwanted bypasses on the sealing surface would be possible. Thanks to the piston device 115 presented here, machining of a recess or groove in the housing is not necessary. By opening voids is avoided. The piston device 115 is coupled by two individual components which are connected to one another. According to this exemplary embodiment, the connection is realized by one or more screws, or according to an alternative

Embodiment by at least one latching and / or welding and / or similar connection. The sealing element 135 or a plurality of sealing elements 135 may have been inserted or drawn into the piston package before the connection or after the connection in the manufacture of the piston device 115. The

According to an alternative exemplary embodiment, sealing element 135 is designed as a Z-ring or a sealing element 135 having a different geometry. According to a further alternative exemplary embodiment, the sealing element 135 is injection-molded onto one of the piston elements 125, 130 in the form of a sealing geometry and the other piston element 125, 130 is arranged as a counterhold.

An advantage of the piston device 115 lies in the simple assembly of the sealing element 135. This does not have to be greatly expanded during assembly in order to have a

Sealing flank to be pulled. In addition, the sealing element 135 is in the

Piston device 115 can be preassembled, as a result of which assembly of the piston device 115 in the piston housing 120 can be carried out very easily.

A depth of the recess 150 can also be increased and is therefore advantageously not dependent on the installation conditions of the seal, as a result of which a geometry of the seal is further optimized in order to ensure a more stable system. A

Machined groove in the piston housing 120 is not required.

According to the exemplary embodiment shown, the electropneumatic modulator 105 is part of a brake system of the vehicle 100. In addition to the modulator 105, the brake system comprises a reservoir 170 for providing compressed air, one

Control device 172 for providing a control signal and a braking device 174 for braking a wheel of vehicle 100. According to one exemplary embodiment, the functionality of modulator 105 corresponds to the functionality of known electropneumatic modulators used in connection with braking systems. According to one exemplary embodiment, the electropneumatic modulator 105 has a control input 180 for receiving the control signal from the control device 172, a supply connection 182 for supplying the compressed air from the supply container 170 and a brake output 184 for outputting a brake pressure to the

Brake device 174 on.

The brake device 174 can be designed in accordance with a brake which is customary in the vehicle area and can comprise, for example, a brake cylinder which can be actuated by the brake pressure. According to one exemplary embodiment, the control signal represents an electrical signal. For example, the control signal can indicate a requested target brake pressure. In this case, the control device 172 is designed, for example, as a brake control device, and the electropneumatic modulator 105 comprises, for example, at least one solenoid valve, which uses the

Control signal or one in response to receipt of the control signal

generated signal is actuated.

According to one exemplary embodiment, the second region 145 represents a control chamber which can be supplied with compressed air supplied in a controlled manner by the control signal in order to bring about a switching movement of the piston device 115. The first region 140 represents a working chamber which is fluidly connected to the brake outlet 184 and can be acted upon by the switching movement of the piston device 115 with compressed air supplied via the supply port 182, around which the

Provide brake pressure at the brake outlet 184.

FIG. 2 shows a schematic cross-sectional illustration of one half of a piston device 115 arranged in a piston housing 120 according to one

Embodiment. This can be an embodiment of a

Act piston device that can be used in connection with an electropneumatic modulator, as described with reference to FIG. 1.

Different possibilities for realizing a functionality of a choke are described with reference to FIG. 2. According to one exemplary embodiment, a piston passage opening 200 extends through the first piston element 125 and the second piston element 135 coupled to the first piston element 125 in order to fluidly connect the first region 140 to the second region 145. The two piston elements 125, 135 thus each have a through opening, which are arranged opposite one another in the assembled state of the piston device 115. Thus, through the two piston parts in the form of the piston elements 125, 130, a channel guide in the form of

Piston passage opening 200 realized. According to this exemplary embodiment, the piston passage opening 200 is used to create a throttle between the upper space, that is to say the second region 145, and the lower space, that is to say the first region 140, as is shown below with reference to FIG. 3.

In addition or as an alternative to the piston passage opening 200, the first has

Piston element 125 according to this exemplary embodiment, at least a first one

Through opening 205 to fluidly connect the first region 140 to an intermediate volume space 210 arranged between the first piston element 125 and the second piston element 130. According to this exemplary embodiment, the second piston element 130 has at least one second through opening 215 in order to fluidly connect the second region 145 to the intermediate volume space 210.

A diameter of the intermediate volume space 210 is according to this

Embodiment larger than one in at least one place

Through hole diameter of the first through hole 205 and / or the second through hole 215. According to this exemplary embodiment, the

Intermediate volume space 210 is formed as a recess in an elevation surface of the elevation of the first piston element 125 facing the second piston element 130. According to an alternative embodiment, the

Intermediate volume space 210 completely arranged in the first piston element 125, the first through opening 205 penetrating the intermediate volume space 210 and opening into the elevation surface and / or the second through opening 215. According to this exemplary embodiment, in addition, or according to an alternative exemplary embodiment, as an alternative to the piston passage opening 200, a further channel guide is used to include a timing element with an intermediate volume in the form of the intermediate volume space 210 and two throttles, here the first and second Through opening 205, 215 to create between the upper and lower space. Such an approach is shown schematically below with reference to FIG. 4.

According to an alternative exemplary embodiment, the piston device 115 has only the piston passage opening 200 or only the first passage opening 205, the intermediate volume space 210 and the second passage opening 215 in one of the variants described.

The channel or channels in the form of the piston passage opening 200, the first passage opening 205 and / or the second passage opening 215 act by delaying pressure equalization and allowing a damping effect in the system.

3 shows a schematic illustration of a throttle 300 of a piston device according to an exemplary embodiment. This can be the throttle described in FIG. 2, which is implemented in FIG. 2 in the form of the piston passage opening.

According to this exemplary embodiment, the throttle 300 fluidly connects a volume above the piston device, that is to say the second region 145, to a volume below the piston device, that is to say the first region 140.

4 shows a schematic illustration of two chokes 400, 405 one

Piston device according to an embodiment. This can be a first throttle 400 and a second throttle 405, which are realized in FIG. 2 as the first through opening and the second through opening.

According to this exemplary embodiment, the second throttle 405 fluidly connects a volume above the piston device to a volume between the piston elements or piston halves. The first throttle 400 connects according to this

Embodiment fluidically the volume between the piston elements or piston halves with a volume below the piston device. A delay in pressure equalization between the first region 140 and the second region 145 is dependent on the volume of the intermediate volume space 210. 5 shows a schematic cross-sectional illustration of an electropneumatic modulator 105 with a piston system 110 with a piston device according to an exemplary embodiment. This can be the modulator 105 described in FIG. 1 with the piston system 110, both halves of the piston system 110 being shown completely in accordance with this exemplary embodiment. It is also in the

Figures 1 and 2 shown axis of symmetry 122 shown. According to this exemplary embodiment, the piston device is received in a receiving chamber of an exemplary one-piece housing of the modulator 105. The first piston element 125 forms a valve seat at an end facing away from the second piston element 130. The inner wall of the first piston element 125 also has a taper at an end facing away from the second piston element 130. This forms a narrow outlet channel 500. The outlet channel 500 has one

Inner diameter that is smaller than an inner diameter of the sleeve-shaped centering element 159. According to this exemplary embodiment, a channel running within the centering element 159 forms, together with the outlet channel 500, an outlet for an outlet solenoid valve of the modulator 105. The outlet solenoid valve is one of a plurality of solenoid valves 505 of the modulator 105.

In addition, the modulator 105 according to this exemplary embodiment has one

pneumatic control input channel 510, which is also used as a backup connection

can be designated.

6 shows a flow diagram of a method 600 for producing a

Piston device according to an embodiment. This can be an exemplary embodiment of the piston devices described with reference to one of the preceding figures.

The method 600 includes a step 605 of providing, a step 610 of coupling, and a step 615 of arranging. In step 605 of providing, a first piston element that is designed to be arranged in a piston housing and a second piston element that is designed to be arranged in the piston housing are provided. In step 610 of coupling, the first piston element is connected to the second piston element coupled. In step 615 of arranging, at least one sealing element is arranged between the first piston element and the second piston element in order to seal a first region of the piston housing, which is adjacent to the first piston element, against a second region of the piston housing, which is opposite the first region and is adjacent to the second piston element, when the Piston device is arranged in the piston housing.

According to this embodiment, the arranging step 615 is carried out after the coupling step 610. According to an alternative embodiment, the step 615 of arranging is carried out before the step 610 of the coupling.

If an exemplary embodiment comprises a “and / or” link between a first feature and a second feature, it should be read in such a way that the

Embodiment according to one embodiment has both the first feature and the second feature and according to a further embodiment either only the first feature or only the second feature.

REFERENCE SIGN LIST

100 vehicle

 105 electropneumatic modulator

110 piston system

 115 piston device

 120 piston housing

 122 axis of symmetry

 125 first piston element

 130 second piston element

 135 sealing element

 140 first area

 145 second area

 146 additional sealing element

 150 recess

 152 outer wall

 155 survey

 156 additional recess

 157 inner wall

 159 centering element

 160 connection point

 165 guide section

 170 storage containers

 172 control device

 174 braking device

 180 control input

 182 supply connection

 184 brake output

 200 piston passage opening

205 first through opening

210 intermediate volume space

 215 second through opening

300 choke 400 first choke

405 second throttle

500 outlet duct

505 solenoid valves

510 pneumatic control input

 600 Method of making a piston device 605 Step of providing

610 step of pairing

615 step of arranging

Claims

PATENT CLAIMS 1. Piston device (115) for an electropneumatic modulator (105) for a vehicle (100), the piston device (115) having the following features: a first piston element (125) which can be arranged in a piston housing (120); a second piston element (130) which can be arranged in the piston housing (120) and is coupled to the first piston element (125) in an assembled state; and at least one sealing element (135), which in the assembled state is arranged between the first piston element (125) and the second piston element (130), around a first region (140) of the Piston housing (120) opposite one of the first area (140) seal opposite and adjacent to the second piston element (130) the second region (145) of the piston housing (120) when the Piston device (115) is arranged in the piston housing (120). 2. Piston device (115) according to claim 1, wherein the first piston element (125) and the second piston element (130) are detachably coupled in the assembled state. 3. Piston device (115) according to one of the preceding claims, in which the first piston element (125) is coupled or can be coupled to the second piston element (130) by means of at least one fastening element and / or in a materially integral manner. 4. Piston device (115) according to one of the preceding claims, in which the first piston element (125) and the second piston element (130) are coupled or can be coupled to one another by means of a bayonet connection and / or a snap lock. 5. Piston device (115) according to one of the preceding claims, wherein the first piston element (125) has a recess (150) for the sealing element (135). 6. Piston device (115) according to one of the preceding claims, in which the second piston element (130) is formed in an annular shape. 7. Piston device (115) according to one of the preceding claims, in which an outer diameter of the sealing element (135) is essentially one Corresponds to the outer diameter of the first piston element (125) and / or the outer diameter of the second piston element (130) and / or the inner diameter of the piston housing (120). 8. Piston device (115) according to one of the preceding claims, with at least one piston passage opening (200), which extends in the assembled state through the first piston element (125) and the second piston element (130) to the first region (140) fluidly with the to connect the second area (145). 9. Piston device (115) according to one of the preceding claims, wherein the first piston element (125) has at least a first through opening (205) to the first region (140) in the assembled state fluidly with a between the first piston element (125) and the to connect the second piston element (130) arranged intermediate volume space (210) and in which the second piston element (130) has at least one second through opening (205) to the second  Area (145) to be fluidly connected to the intermediate volume space (210) in the assembled state. 10. Piston device (115) according to claim 9, wherein the Intermediate volume space (210) is formed as a timing element. 11. Piston system (110) with the piston housing (120) and one in the Piston housing (120) arranged piston device (115) according to one of the preceding claims. 12. Electropneumatic modulator (105) for a vehicle (100), the modulator (105) having the following features: a control input (180) for receiving a control signal; a supply port (182) for supplying compressed air; a brake output (184) for outputting brake pressure; and a piston system (110) according to claim 11, which is connected between the supply port (182) and the brake output (184), wherein a piston position of the Piston device (115) within the piston housing (120) can be controlled by the control signal in order to provide the brake pressure using the compressed air. 13. A method (600) for producing a piston device (115) for a Electropneumatic modulator (105) for a vehicle (100), the Method (600) comprises the following steps: Providing (605) a first piston element (125) which is in a Piston housing (120) is designed to be arranged and a second Piston element (130), which is designed to be arranged in the piston housing (120); Coupling (610) the first piston element (125) to the second piston element (130); and Arranging (615) at least one sealing element (135) between the first Piston element (125) and the second piston element (130), around a first region (140) of the piston housing (120) adjoining the first piston element (125) with respect to an area opposite the first region (140) and adjoining the second piston element (130) seal the second region (145) of the piston housing (120) when the piston device (115) is in the piston housing (120) is arranged.