Pneumatic brake cylinder and disc brake

Abstract

The invention relates to a pneumatic brake cylinder (4) for a vehicle brake, comprising: a brake cylinder housing (24); a brake piston (9) which is axially guided in the brake cylinder housing and has an extendable and retractable piston rod (6) which protrudes through an opening (27) in a bottom (25) of the brake cylinder housing (24); a brake chamber (10) which can be supplied with air and deflated, the brake piston (9) together with the piston rod (6) being in a brake application position when the brake chamber (10) is supplied with air and in a brake release position together with the piston rod when the brake chamber (10) is deflated, and wherein the brake piston (9) delimits the brake chamber (10); a return spring chamber (20) in which a return spring (21), which acts on the brake piston (9) in the brake release position, is accommodated and which is delimited on the one hand by the brake piston (9) and on the other hand by the bottom (25) of the brake cylinder housing (24); a fastening device (2) which is provided and designed to detachably fasten the brake cylinder (4) to a support structure (3) for the brake cylinder (4), the fastening device (2) comprising at least one fastening bolt (11a, 11b; 35a, 35b), which are connected to each other; a ventilation device (29) which cooperates with the return spring chamber (20) such that air can flow out of or into the return spring chamber (20) when a movement of the brake piston (9) by the ventilation device causes a change in the volume of the return spring chamber (20). According to the invention, it is provided that the ventilation device (29) comprises at least one fastening bolt (11a, 11b; 35a, 35b) which, on the one hand, leads into the return spring chamber (20) with a first mouth (30) and, on the other hand, leads into an outer region (32) of the brake cylinder (4) with a second mouth (31).

Description

Technical Field

[0001] The invention relates to a pneumatic brake cylinder for a vehicle brake according to the general concept of claim 1, a disc brake for a vehicle having at least one such pneumatic brake cylinder according to the general concept of claim 13, and a vehicle having at least one such disc brake according to claim 17. Background Art

[0002] From DE 198 30 154 A1 Figure 3 and Figure 4 A universal brake cylinder is known from EP 3049 300 B1. There, two fastening bolts made of solid material protrude away from the bottom of the brake cylinder. In addition, the ventilation device comprises a ventilation opening formed in the wall of the brake cylinder, into which a connection piece for the connection of an air line is welded. The air duct serves to ensure that the compressed air is guided to a higher level relative to the level of the brake cylinder in the case of a reduction in the size of the return spring chamber and from there to the atmosphere. Since the brake cylinder is arranged at a relatively low level in the wheel housing of the vehicle, the purpose of the air duct connected to the ventilation opening is to prevent dirt or water from entering the brake cylinder through the ventilation opening, which is useful for off-road vehicles, for example. The disadvantage here is that, due to the radially protruding connection piece welded into the ventilation opening, the end edge of the brake cylinder cannot be connected to the end edge of the spring brake cylinder by the crimping method or flanging method described in EP 3049 300 B1 to form a combined cylinder. For this purpose, it must be possible to clamp the radial outer peripheral surface of the brake cylinder in the punch or base of the crimping tool.

[0003] A universal disc brake is known from DE 10 2012 016 712 A1. There, the fastening device for the brake cylinder has fastening bolts with an external thread, which are fastened in the brake cylinder, project away from the brake cylinder, enter the screw holes of the brake caliper, and are locked there with nuts. A disadvantage of this type of fastening device is that when the brake cylinder is removed from the brake caliper, for example for maintenance purposes, the brake cylinder must be pulled away from the brake caliper in the direction of the fastening bolts, at least over the length of the fastening bolts, so that the bolts of the brake cylinder can be pulled out of the screw holes of the brake caliper. However, this requires a certain amount of space in the wheel housing of the vehicle equipped with the disc brake, which space is usually not available. In addition, it takes a relatively long time to remove the brake cylinder from the brake caliper. Summary of the invention

[0004] The object of the present invention is to provide a pneumatic brake cylinder for a vehicle which is easier to manufacture. In addition, a disc brake having such a pneumatic brake cylinder and a vehicle having such a disc brake cylinder will be provided.

[0005] This object is achieved according to the invention by the features of claims 1 , 13 and 17 .

[0006] A first aspect of the present invention relates to a pneumatic brake cylinder for a vehicle brake, in particular a pneumatic service brake cylinder, which has

[0007] a) Brake cylinder housing,

[0008] b) a brake piston which is guided axially in the brake cylinder housing and has a retractable and extendable piston rod which projects through an opening in the bottom of the brake cylinder housing,

[0009] c) a brake chamber, which can be supplied with air and exhausted, wherein when the brake chamber is supplied with air, the brake piston together with the piston rod is in a brake applied position, and when the brake chamber is exhausted, the brake piston together with the piston rod is in a brake released position, and wherein the brake piston delimits the brake chamber,

[0010] d) a return spring chamber, in which a return spring is accommodated which loads the brake piston into the brake release position and which is delimited on the one hand by the brake piston and on the other hand by the bottom of the brake cylinder housing,

[0011] e) a fastening device, which is arranged and designed for detachably fastening the brake cylinder to a support structure for the brake cylinder, the fastening device comprising at least one fastening bolt which projects axially away from the brake cylinder housing in the bottom region,

[0012] f) a venting device, which cooperates with the return spring chamber so that, when the volume of the return spring chamber changes due to the movement of the brake piston, air can flow out of the return spring chamber or into the return spring chamber through the venting device. According to a first aspect of the present invention, it is provided that:

[0013] g) The breather device comprises at least one fastening screw with at least one inner channel which opens with a first opening into the return spring chamber on the one hand and with a second opening into the outer region of the brake cylinder on the other hand.

[0014] The invention also makes use of the fact that the at least one fastening bolt generally projects away from the bottom of the brake cylinder housing, which delimits the return spring chamber. This also generally applies to combined service brake cylinders and spring brake cylinders (so-called combined cylinders), wherein the service brake cylinder is formed by the pneumatic brake cylinder according to the invention. In other words, the return spring chamber is vented and vented via the at least one internal channel of the at least one fastening bolt, while the volume of the return spring chamber changes due to the movement of the brake piston.

[0015] The inner channel can include a through opening extending in the axial direction of the fastening bolt, for example a central through opening. In addition, the inner channel can have any course in the fastening bolt as long as it leads to the return spring chamber with a first mouth and to the outer region of the brake cylinder or the return spring with a second mouth.

[0016] The at least one fastening bolt thus has an advantageous dual function, serving on the one hand as part of the fastening device for fastening the pneumatic brake cylinder to the supporting structure and on the other hand as part of the ventilation device for ventilating the return spring chamber. This also leads to a reduction in the number of brake cylinder parts, since additional ventilation holes and connecting pieces, as in DE 198 30 154 A1 mentioned at the outset, are no longer necessary.

[0017] Since the at least one fastening bolt preferably projects in the axial direction relative to the center axis of the brake cylinder away from the bottom of the brake cylinder, a socket welded into the ventilation hole in the cylindrical wall of the brake cylinder is no longer necessary. Without such a radially protruding mouth, the brake cylinder can be connected to the spring brake cylinder and / or the intermediate flange during the crimping process.

[0018] Advantageous embodiments of the pneumatic brake cylinder according to the invention are listed in the dependent claims.

[0019] Particularly preferably, the at least one fastening bolt and the piston rod are arranged parallel to one another.

[0020] The at least one fastening bolt can also form a separate component and comprise a bolt shaft, an external thread formed on the bolt shaft, and an abutment element which projects radially away in an end region of the bolt shaft and is designed to be integrated with the fastening bolt or as a separate element. The abutment element can in particular comprise an attachment surface for a screwing tool.

[0021] For example, the fastening bolt can be of the screw type, in which case the bolt shaft forms the screw shaft and the abutment element forms the screw head. Preferably, the screw then comprises at least one internal channel.

[0022] Furthermore, at least one hole can be formed in the region of the bottom of the brake cylinder, through which hole the screw shaft projects or into which hole it projects and / or in particular the screw shaft can be screwed in with its external thread.

[0023] According to a preferred embodiment, the hole can be internally threaded, and the bolt shaft can be formed and arranged to be threadedly connected to the internal thread of the hole with an external thread. In addition, the abutting element can be formed and arranged to abut against the supporting structure at the supporting structure hole or at the supporting structure hole.

[0024] The hole may be formed in the wall of the bottom of the brake cylinder and / or in a separate body which is releasably or non-releasably connected to the inner surface of the bottom of the brake cylinder housing.

[0025] The advantage of this preferred embodiment is that a threaded connection can then be provided between the brake caliper as an example of a support structure and the brake cylinder, so that the relationship is reversed compared to DE 10 2012 016 712 A1 mentioned at the beginning. Then, there are no fastening bolts fixedly connected to the bottom of the brake cylinder housing, but the bottom is provided with holes into which screws can be screwed, wherein their screw heads abut, for example, at support structure holes (e.g. screw holes) of the brake caliper. Therefore, during the removal of the brake cylinder from the brake caliper, the distance that the brake cylinder must be moved away from the brake caliper, as seen in the direction of the center axis of the brake cylinder, is no greater than the distance required to disengage the piston rod of the brake cylinder from the clamping device of the brake caliper. As a result, the installation space in the vehicle wheel housing required for removal of the brake cylinder is advantageously reduced.

[0026] A method for releasing a brake cylinder from a support structure, in particular from a caliper of a disc brake, then comprises at least the following steps:

[0027] a) Attach the screwdriver to the screw head,

[0028] b) unscrewing at least one screw from the brake cylinder housing bore and / or from a separate body,

[0029] c) remove at least one screw,

[0030] d) Disengage the piston rod of the brake cylinder from the clamping device in the brake caliper.

[0031] According to another embodiment, the abutment element of the fastening bolt can be formed and arranged to abut against the inner surface of the bottom of the brake cylinder housing. In this regard, the bolt shaft can be formed and arranged to extend through the brake cylinder housing hole of the bottom of the brake cylinder housing and the support structure hole of the support structure, and locked to the support structure through the hole with a nut threadedly connected to the external thread of the bolt shaft, or threadedly connected with the internal thread of the support structure hole of the support structure with the external thread.

[0032] Typically, at least one fastening bolt can be provided with a connection for a compressed air line in the region of the second mouth of the inner channel and / or can be connected to a compressed air line via the second mouth of the inner duct. By means of this measure, as described at the outset, the intake and exhaust (degassing) of the return spring chamber can take place at a modified level relative to the brake cylinder, in particular at a higher level. In this case, the compressed air line and / or the compressed air duct connected to the connection can lead to the atmosphere or to the cabin of the vehicle.

[0033] Particularly preferably, apart from the at least one internal channel formed in the at least one fastening bolt, no further flow connection is provided between the return spring chamber and the outer region of the brake cylinder. Advantageously, the wall of the brake cylinder housing does not have to be provided with a vent or vent hole for the return spring chamber.

[0034] In particular, the brake piston can also be completely rigid or comprise a diaphragm, which is attached to the brake cylinder housing via a diaphragm edge and a rigid plate part, which is supported on the rigid plate part and which is connected to the piston rod.

[0035] A second aspect of the invention is based on a disc brake for a vehicle, comprising a pneumatic brake cylinder, a brake disc, a brake caliper as a supporting structure, a clamping device and a brake pad, wherein the brake caliper is engaged above the brake disc, a clamping device actuable by the brake cylinder is arranged in the brake caliper, by means of which the brake pad can be pressed against the brake disc on both sides during braking, a retractable and extendable piston rod of the brake cylinder is engaged with the clamping device, and the brake caliper is releasably fastened to the brake cylinder by a fastening device.

[0036] In this second aspect, according to the invention, the pneumatic brake cylinder is as described above, ie according to the first aspect of the invention. The pneumatic brake cylinder is then detachably attached to the brake caliper by means of the above-mentioned fastening means.

[0037] In this case, the retractable and extendable piston rod of the brake cylinder engages with a clamping device, for example, the clamping device has a receptacle for an end of the piston rod, in which the end engages.

[0038] The brake caliper is detachably fastened to the brake cylinder by a fastening device, which means that by removing the fastening device, the brake caliper and the brake cylinder can be detached from each other without being damaged.

[0039] As described above, according to a preferred embodiment of the pneumatic brake cylinder, the brake cylinder housing hole can be internally threaded, and the bolt shaft can be formed and arranged to be threadedly connected to the brake cylinder housing hole internal thread with an external thread. In addition, an abutment element can be formed and arranged, such as a nut or a screw head can be formed and arranged to abut against the support structure hole of the support structure.

[0040] The brake cylinder housing bore may be formed in a wall of the brake cylinder bottom and / or in a separate body that is releasably or non-releasably connected to an inner surface of the brake cylinder housing bottom.

[0041] The advantage of this preferred embodiment of the pneumatic brake cylinder as a disc brake component is that a threaded connection can be provided between the brake caliper and the brake cylinder. Since the bottom of the brake cylinder housing is provided with at least one brake cylinder housing bore, a screw with its screw head abutting, for example at a screw hole or at the edge of a supporting structure, can be screwed through the bore of the brake caliper into the brake cylinder housing bore or into a separate body fastened there detachably or non-detachably. Therefore, during disassembly from the brake caliper, the distance that the pneumatic brake cylinder has to be moved away from the brake caliper, as seen in the direction of the center axis of the brake cylinder, does not exceed the distance required to disengage the piston rod of the brake cylinder from the clamping device of the brake caliper. As a result, the installation space in the vehicle wheel housing required for disassembly and assembly of the brake cylinder is advantageously reduced.

[0042] A method for releasing a brake cylinder from a caliper of a disc brake comprises at least the following steps:

[0043] a) Attach the screwdriver to the screw head,

[0044] b) remove at least one screw from the brake cylinder housing bore and / or separate body,

[0045] c) remove at least one screw,

[0046] d) Disengage the piston rod of the brake cylinder from the clamping device in the brake caliper.

[0047] Furthermore, the brake caliper can have a recess so that a screwing tool can be applied to the fastening bolt, viewed in a direction perpendicular to the axis of the at least one fastening bolt.

[0048] Furthermore, the caliper may include at least one supporting structure hole or screw hole for a fastening bolt to pass through and be fixed or abutted against.

[0049] Preferably, in a disc brake, the pneumatic brake cylinder may be part of a combined service brake cylinder and spring brake cylinder, with an intermediate flange being arranged between the brake cylinder and the spring brake cylinder to define a service brake chamber. Alternatively, in a disc brake, the pneumatic brake cylinder may be a separate service brake cylinder.

[0050] According to a third aspect of the present invention, a vehicle, in particular a commercial vehicle, is proposed, which comprises a pneumatic or electro-pneumatic braking device, which comprises at least one disc brake as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Examples of embodiments of the invention are shown in the following drawings and will be explained in more detail in the following description. The drawings show:

[0052] Figure 1is a partial perspective cross-sectional view of a disc brake according to a preferred embodiment, wherein a pneumatic brake cylinder is attached to a brake caliper by a detachable fastening device;

[0053] Figure 2 yes Figure 1 Another perspective view of the disc brake shown;

[0054] Figure 3 yes Figure 1 An enlarged perspective view of a central disc brake in the area of ​​the fastening device of the pneumatic brake cylinder;

[0055] Figure 4 It is a preferred embodiment of a fastening bolt of a fastening device of a pneumatic brake cylinder;

[0056] Figure 5 yes Figure 1 A partial longitudinal section of a center disc brake in the area of ​​the fastening device;

[0057] Figure 6 is a perspective view of a disc brake according to another embodiment, wherein a pneumatic brake cylinder according to another embodiment is attached to a brake caliper via a releasable attachment device;

[0058] Figure 7 yes Figure 6 An enlarged perspective view of a disc brake in the region of a fastening device of a pneumatic brake cylinder;

[0059] Figure 8 is another embodiment of a fastening bolt of a fastening device of a pneumatic brake cylinder;

[0060] Fig. 9 yes Figure 6 Longitudinal section through a center disc brake in the area of ​​the mounting. DETAILED DESCRIPTION

[0061] Figure 1 A partial perspective sectional view of a preferred embodiment of a disc brake 1 for a commercial vehicle is shown, in which a pneumatic brake cylinder 4 is detachably fastened to a brake caliper 3 via a detachable fastening device 2. The pneumatic brake cylinder 4 is here, for example, a pneumatic service brake cylinder, which forms a structural unit with an intermediate flange 40 and a spring brake cylinder 5, the structural unit representing a so-called combined cylinder of a pneumatic service brake cylinder 4 and a pneumatic spring brake cylinder.

[0062] The disc brake 1 comprises: a pneumatic service brake cylinder 4; a brake disc not shown here; a brake caliper 3 straddling the brake disc; and a clamping device 7 not shown in detail here, which is arranged in the brake caliper 3 and can be operated by a piston rod 6 of the service brake cylinder 4; and a brake pad 8.

[0063] More precisely, the piston rod 6 is connected to a brake piston 9 of the service brake cylinder 4, which is actuated by supplying and exhausting air from the brake chamber 10 of the service brake cylinder 4, wherein the piston rod 6 moves out of the brake cylinder housing 24 of the service brake cylinder 4, for example, during supplying air and into the brake cylinder housing 24 during exhausting the service brake cylinder 4. For this purpose, a central opening 27 is provided in the bottom 25 of the brake cylinder housing 24, which is sealed by a seal 26, which in this case is, for example, a bellows. As a result, no air can pass from the return spring chamber 20 through the opening 27 to the outer region 32, and vice versa. The brake chamber 10 is delimited by the intermediate flange 40, the brake cylinder housing 24 and the brake piston 9, and the return spring chamber 20 is delimited by the brake cylinder housing 24 and the brake piston 9.

[0064] One end of the piston rod 6 protruding axially from the opening 27 engages with a receiver of the clamping device (brake application device) 7 so that the retraction or extension movement of the piston rod 6 is transmitted to the mechanism of the clamping device 7, whereby the latter presses the brake pad 8 against the brake disc on both sides during brake application (air supply to the brake chamber 10) and releases the brake pad from the brake disc during brake release (exhaust of the brake chamber 10).

[0065] The brake caliper 3 and the service brake cylinder 4 can be connected or released to each other by the fastening device 2, which includes, for example, a plurality of fastening bolt connections, which are designed as screw connections, for example. This fastening bolt connection or screw connection includes, for example, a first fastening bolt 11 and at least one first hole 14a formed in, for example, the service brake cylinder 4 and having an internal thread. The first fastening bolt is particularly designed as a first fastening screw, which has a first screw head 12a, a first screw shaft 13a and an external thread formed on the first screw shaft 13a. The first screw shaft 13a is screwed into the internal thread with the external thread, especially in Figure 5 The first screw head 12a is locked to a first abutment surface 15a of the brake caliper 3, which is formed here, for example, by a screw hole of the brake caliper. The first hole 14a and the second hole 14b are each connected to a brake cylinder housing hole 19a, 19b, which is preferably designed as a non-threaded through hole.

[0066] In a similar manner, a second screw 11b is provided for a tightening bolt or screw connection, which also locks with its second screw head 12b on a second abutment surface 15b of the brake caliper 3, which second abutment surface is also formed here as a screw hole, for example. In this case, the second screw shaft 13b is also screwed with its external thread into the internal thread of the second hole 14b ( Figure 1 ). Preferably, the screws 11 a and 11 b of the screw connection and the piston rod 6 of the service brake cylinder 4 are arranged parallel to each other.

[0067] The first hole 14a and the second hole 14b are processed as blind holes or through holes, for example, and are located in a first body 16a and a second body 16b, for example, which are separated and arranged inside the service brake cylinder 4. Figure 1 and Figure 5 1 and in particular welded to the wall 17 of the service brake cylinder 4, for example in each case by an annular weld 18, as shown Figure 1 As shown. Then, the first hole 14a and the second hole 14b are both provided with internal threads on their radial inner circumferential surfaces, and the external threads of the screw shafts 13a, 13b are screwed into the internal threads. The first body 16a and the second body 16b are, for example, rectangular parallelepiped shapes, and at least their outer surfaces are formed in such a way that they can fit against the inner surface of the wall 17 or the bottom 25 of the service brake cylinder 4.

[0068] The screw shafts 13a, 13b of the screws 11a, 11b extend through the brake cylinder housing holes 19a, 19b in the bottom 25 of the brake cylinder housing 24 to be screwed into the holes 14a, 14b of the bodies 16a, 16b. In particular, the first and second bodies 16 are arranged in a return spring chamber 20 separated from the brake chamber 10 by the brake piston 9, in which a return spring 21 is accommodated, which biases the brake piston 9 into the release position of the brake. Between the screw heads 12a, 12b and the support structure holes 15a, 15b, each of which is in the form of a threaded hole, a corresponding annular gasket 22a, 22b is also arranged.

[0069] like Figure 2 and Figure 3 As best shown, the brake caliper 3 can have a first recess 23a and a second recess 23b in the region of the screw heads 12a, 12b and in the region of the abutment support structure holes 15a, 15b (e.g. screw holes), respectively, so that a screwing tool can be applied to the screw heads 12a and 12b, seen perpendicularly to the screw axis of the screws 11a, 11b, by means of which the screws 11a and 11b can then be screwed. For this purpose, the screw heads 12a, 12b can each have any attachment surface for the screwing tool, in this case, for example, an external hexagonal profile for an open-end spanner. By applying an open-end spanner to the hexagonal profile of the respective screw head 12a, 12b, the screw connection can thus be assembled or released. Preferably, the fastening device 2 comprises a plurality of such screw connections, in particular distributed over the circumference of the service brake cylinder 4.

[0070] like Figures 1 to 5As shown, the first screw 11a differs from the second screw 11b, in which respect the second screw represents a commercially available screw, the difference being described below. The first screw 11a is provided with an internal channel 28 of a ventilation device 29 of the service brake cylinder 4 or of the return spring chamber 20, which internal channel 28 extends axially through, for example, the entire first screw 11a and is centered in this case. The internal channel 28 opens into the return spring chamber 20 with a first mouth 30 or opening (here, for example, an end-side mouth or opening) and opens into an outer region or region 32 of the service brake cylinder 4 with a second mouth or opening (here, for example, an end-side mouth or opening). The internal channel 28 thus provides a flow connection between the return spring chamber 20 and the outer region 32 of the brake cylinder 4, which here, for example, is the only flow connection, as Figure 5 As shown by the arrow 33 in . Otherwise, the return spring chamber 20 is preferably designed to be pressure-tight. At the same time, the second screw 11b does not have such an internal channel 28 here, for example, but may also be provided with such an internal channel 28 alternatively.

[0071] As a further difference from the second screw 11b, the first screw 11a has, for example, a connection 34 as a central axial extension of the first screw head 12a, to which a pressure line, not shown here, is connected, which leads, for example, to the cab of a commercial vehicle. In this respect, the second mouth 31 of the internal duct 28 is formed here at or in the connection 34. Thus, compared to the lower height of the service brake cylinder 4 in the wheel housing of the commercial vehicle, the ventilation of the return spring chamber 20 can be carried out at a higher height, namely in the cab, which advantageously prevents dirt and water from penetrating into the return spring chamber 20, in particular in the case of passing through a waterway.

[0072] Preferably, the second screw 11b here does not have such a connection portion 34, but it can also have such a connection portion 34 if it is also provided with an inner channel 28. However, it is preferably sufficient if only one screw 11a of the screw connection of the fastening device 2 is provided with an inner channel 28 and a connection portion 34.

[0073] Therefore, from Figure 1Starting from the illustrated assembled state of the service brake cylinder 4 on the caliper 3 of the disc brake 1, in order to remove the service brake cylinder 4 from the caliper 3, an open-end wrench is applied, for example, to the hexagonal profile of the screw heads 12a, 12b, and then the screws 11a, 11b are unscrewed from the holes 14a, 14b of the bodies 16a, 16b and then removed. Furthermore, by withdrawing the service brake cylinder 4 axially from the brake caliper 3 by a certain distance, the end of the piston rod 6 of the service brake cylinder 4 is disengaged from the associated receiver of the clamping device 7 in the brake caliper 3, the axial direction being parallel to the piston rod 6. Then, when the end of the piston rod 6 is disengaged from the associated receiver of the clamping device 7, the service brake cylinder 4, which has been released from the brake caliper 3, is removed from the brake caliper 3 in a transverse direction perpendicular to the piston rod 6 and can then be pulled out, for example, transversely from the wheel housing.

[0074] In order to remove the service brake cylinder 4 from the brake caliper 3, after loosening and removing the screws 11a, 11b, the service brake cylinder 4 must be moved away from the brake caliper 3, in particular, viewed in the direction of the longitudinal axis of the screws 11a, 114b, only until the end of the piston rod 6 of the service brake cylinder 4 is disengaged from the associated receiver of the application device 7 in the brake caliper 3.

[0075] Figures 6 to 9 Another embodiment of a disc brake 1 and another embodiment of a service brake cylinder 4 are shown. Figures 1 to 5 Compared to the preferred embodiment of FIG. 1 , the design of the fastening device 2 here is different.

[0076] Here, on the first fastening bolt 35a (here also preferably designed as a separate body), the first abutment element 39a is preferably formed integrally and arranged to be locked to the inner bottom surface of the bottom 25 of the brake cylinder housing 24, and the first bolt shaft 36a provided with an external thread extends through the first brake cylinder housing hole 19a (here the first brake cylinder housing hole is preferably unthreaded) and is locked to the first support structure hole 15a by the first nut 37a, and the first support structure hole 15a is also preferably designed as a screw hole of the brake caliper 3. An internal channel 28 is formed in the first fastening bolt 35a, as described in the preferred embodiment above, and the internal channel 28 leads to the return spring chamber 20 through the first mouth 30 (here, for example, the end side mouth), and leads to the outer area 32 of the service brake cylinder 4 through the second mouth 31 (here, for example, the end side mouth).

[0077] The inner channel 28 thus provides a flow connection between the return spring chamber 20 and the outer region 32, in this case, for example, the only flow connection, also as Fig. 9 As shown by arrow 33 in FIG.

[0078] Furthermore, the first fastening bolt 35a has a connection 34 as a central axial extension of, for example, the first bolt shaft 36a, to which a pressure line, not shown here, is also connected, which leads, for example, to the cab of the commercial vehicle. In this respect, the second mouth 31 of the internal channel 28 is also formed at or in the connection 34.

[0079] In addition, the fastening device 2 of another embodiment includes a second fastening bolt 35b, where for example the second fastening bolt 35b has no internal channel 28 and no connecting portion 34, but is constructed in other aspects like the first fastening bolt 35a, and is locked at the second support structure hole 15b by a second nut 37b, which is also preferably configured as a screw hole.

[0080] However, as in the preferred embodiment, the second attachment bolt 35 b may include the internal passage 28 and the connecting portion 34 .

[0081] List of reference numerals:

[0082] 1 Disc brake

[0083] 2 Fastening device

[0084] 3 Brake calipers

[0085] 4 Service brake cylinder

[0086] 5 Spring brake cylinder

[0087] 6 Piston rod

[0088] 7 Clamping device

[0089] 8 Brake pads

[0090] 9 Brake piston

[0091] 10 Brake chamber

[0092] 11a / b 1st / 2nd screw

[0093] 12a / b 1st / 2nd screw head

[0094] 13a / b 1st / 2nd screw shaft

[0095] 14a / b First / Second hole

[0096] 15a / b First / second support structure hole

[0097] 16a / b First / Second Subject

[0098] 17 walls

[0099] 18 Weld

[0100] 19a / b 1st / 2nd brake cylinder housing bore

[0101] 20 Return spring chamber

[0102] 21 Return spring

[0103] 22a / b First / second ring gasket

[0104] 23a / 23 1st / 2nd recess

[0105] 24 Brake cylinder housing

[0106] 25 Bottom

[0107] 26 Seals

[0108] 27 Opening

[0109] 28 Internal Passage

[0110] 29 Ventilation device

[0111] 30 First Mouth

[0112] 31 Second Mouth

[0113] 32 External Area

[0114] 33 Arrow

[0115] 34 Connection

[0116] 35a / b 1st / 2nd mounting bolt

[0117] 36a / b 1st / 2nd bolt axis

[0118] 37a / b First / Second Nut

[0119] 38 Arrow

[0120] 39a / b First / second abutment element

[0121] 40 Intermediate flange

Claims

1. A pneumatic brake cylinder (4) for a vehicle brake, having a) brake cylinder housing (24), b) a brake piston (9) which is axially guided in a brake cylinder housing (24) and has a retractable and extendable piston rod (6) which projects through an opening (27) in a bottom (25) of the brake cylinder housing (24), c) a brake chamber (10) which can be supplied with air and exhausted, wherein when the brake chamber (10) is supplied with air, the brake piston (9) together with the piston rod (6) is in a brake applied position, and when the brake chamber (10) is exhausted, the brake piston (9) together with the piston rod is in a brake released position, and wherein the brake piston (9) delimits the brake chamber (10), d) a return spring chamber (20) in which a return spring (21) is accommodated for loading the brake piston (9) into the brake release position and which is delimited on the one hand by the brake piston (9) and on the other hand by the bottom (25) of the brake cylinder housing (24), e) a fastening device (2) which is arranged and designed for releasably fastening the brake cylinder (4) to a support structure (3) for the brake cylinder (4), the fastening device (2) comprising at least one fastening bolt (11a, 11b; 35a, 35b) which projects away from the brake cylinder housing (24) in the region of the base (25), f) a venting device (29) which cooperates with the return spring chamber (20) so that, in the event of a change in the volume of the return spring chamber (20) due to a movement of the brake piston (9), air can flow out of the return spring chamber (20) or into the return spring chamber (20) through the venting device, characterized in that: g) The ventilation device (29) comprises at least one of the fastening bolts (11a, 11b; 35a, 35b) having at least one internal channel (28), which on the one hand opens with a first opening (30) into the return spring chamber (20) and on the other hand opens with a second opening (31) into the outer area (32) of the brake cylinder (4).

2. The pneumatic brake cylinder according to claim 1, characterized in that: The at least one fastening bolt (11a, 11b; 35a, 35b) and the piston rod (6) are arranged parallel to each other.

3. The pneumatic brake cylinder according to claim 1 or 2, characterized in that: The at least one fastening bolt (11a, 11b; 35a, 35b) forms a separate component and includes a bolt shaft (13a, 13b; 36a, 36b), an external thread formed on the bolt shaft (13a, 13b; 36a, 36b), and an abutment element (12a, 12b; 39a, 39b), which protrudes radially away in the area of ​​one end of the bolt shaft and is designed to be integrated with the fastening bolt (13a, 13b; 36a, 35b) or as a separate element.

4. The pneumatic brake cylinder according to claim 3, characterized in that: At least one hole (14a, 14b) is formed in the region of the bottom (25) of the brake cylinder (4), through which the bolt shaft (13a, 13b; 36a, 36b) protrudes, or into which the bolt shaft (13a, 13b; 36a, 36b) protrudes.

5. The pneumatic brake cylinder according to claim 4, characterized in that: The holes (14a, 14b) are provided with internal threads, and a) the bolt shaft (13a, 13b; 36a, 36b) is designed and intended to be screwed with an external thread into an internal thread of a hole (14a, 14b), and b) The abutment elements (12a, 12b) are formed and arranged to abut against the support structure holes (15a, 15b) of the support structure (3).

6. The pneumatic brake cylinder according to claim 5, characterized in that: Hole (14a, 14b) a) is formed in the bottom (25) of the brake cylinder (4), and / or b) is formed in a separate body (16a, 16b) which is detachably or non-detachably connected to the inner surface of the bottom (25).

7. The pneumatic brake cylinder according to claim 4, characterized in that: The abutment elements (39a, 39b) are formed and arranged to abut against the inner surface of the bottom (25) of the brake cylinder housing (24).

8. The pneumatic brake cylinder according to claim 7, characterized in that: The bolt shaft (36a, 36b) is formed and arranged as: a) extends through a support structure hole (15a, 15b) of a support structure (3) and is screwed to a nut (37a, 37b) with an external thread, or b) Screwed with external threads to the internal threads of the support structure holes (15a, 15b) of the support structure (3).

9. A pneumatic brake cylinder according to any one of the preceding claims, characterised in that The at least one fastening bolt (11a, 11b; 35a, 35b) a) a connection (34) for a compressed air line is provided in the region of the second mouth (31) of the inner channel (28), and / or b) Connect to the compressed air line with the second nozzle (31) of the inner pipe (28).

10. The pneumatic brake cylinder according to claim 9, characterized in that: The compressed air line and / or the compressed air duct lead to the atmosphere or to the cabin of the vehicle.

11. A pneumatic brake cylinder according to any one of the preceding claims, characterised in that Apart from the internal channel (28) formed in the at least one fastening bolt (11a, 11b; 35a, 35b), no further flow connection is provided between the return spring chamber (20) and the outer region (32) of the brake cylinder (4).

12. A pneumatic brake cylinder according to any one of the preceding claims, characterised in that The brake piston (9) is of rigid design or comprises a diaphragm which is attached to the brake cylinder housing (24) via a diaphragm edge and a plate portion which is supported on the plate portion which is connected to the piston rod (6).

13. A disc brake (1) for a vehicle, comprising a pneumatic brake cylinder (4), a brake disc, a brake caliper (3) as a supporting structure, a clamping device (7) and a brake pad (8), wherein the brake caliper (3) is engaged above the brake disc, the clamping device (7) which can be actuated by the brake cylinder (4) is arranged in the brake caliper (3), the brake pad (8) can be pressed against both sides of the brake disc during braking by means of the clamping device, the retractable and extendable piston rod (6) of the brake cylinder (4) is engaged with the application device (7), characterized in that A pneumatic brake cylinder (4) according to any one of the preceding claims, which is detachably fastened to the brake caliper (3) by means of a fastening device (2).

14. The disc brake according to claim 13, characterized in that The brake caliper (3) has a recess (23a, 23b) so that a screwing tool can be applied to the fastening bolt (11a, 11b; 35a, 35b) as seen from a direction perpendicular to the axis of the at least one fastening bolt (11a, 11b; 35a, 35b).

15. The disc brake according to claim 13 or 14, characterized in that The brake caliper (3) comprises at least one supporting structure hole (15a, 15b) for a fastening bolt (11a, 11b; 35a, 35b) to pass through and be fastened.

16. The disc brake according to any one of claims 13 to 15, characterized in that Pneumatic brake cylinder(4) a) is part of a combined service brake cylinder and spring brake cylinder, wherein an intermediate flange (40) is arranged between the pneumatic brake cylinder (4) and the spring brake cylinder, which defines a brake chamber (10), or b) is a separate service brake cylinder (4).

17. Vehicle having at least one disk brake (1) according to at least one of claims 13 to 16.

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