Combined service brake cylinder with service brake cylinder mounted in spring brake cylinder and spring brake cylinder
By fully setting the driving brake cylinder in the combined driving brake cylinder and the spring brake cylinder, and optimizing the pressure with the pot-like structure and ventilation device, the problems of space occupation and energy consumption are solved, and the problem of power consumption is achieved. Efficient driving and parking braking functions.
Patent Information
- Application Number
- CN202380035783.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-06-03
- Filing Date
- 2023-05-31
- Publication Date
- 2024-12-20
AI Technical Summary
The existing combined driving brake cylinders and spring brake cylinders are arranged on the rear axle of commercial vehicles, which occupy a large space and have high parking brake release pressure, resulting in increased energy consumption and insufficient braking force.
Design a combined driving brake cylinder and a spring brake cylinder, where the driving brake cylinder is completely arranged in the spring brake cylinder, and the driving brake piston is directly guided on the radial inner circumferential surface to form a pot-like structure, avoiding the spring The brake piston is affected by the driving brake pressure and the parking brake release pressure is optimized through the ventilation device.
The space of the combined driving brake cylinder and spring brake cylinder is shortened, energy consumption is reduced and braking force is improved, ensuring the independence of driving and parking functions.
Smart Images
Figure CN119173428A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a combined service brake cylinder and spring brake cylinder according to the preambles of claims 1 and 7, and to a pneumatic or electro-pneumatic vehicle brake comprising at least one combined service brake cylinder and spring brake cylinder according to claim 29. Background Art
[0002] The combined pneumatic service brake cylinder and spring brake cylinder with service brake function and parking brake function is usually arranged on the rear axle of the commercial vehicle and usually has two compressed air ports. One compressed air port controls the parking brake function and is under parking brake release pressure when the commercial vehicle is in driving state, which is used to compress the accumulator spring of the spring brake cylinder. The other compressed air port controls the service brake function and is exhausted in the driving state to brake the commercial vehicle via the service brake. If the commercial vehicle needs to be parked, the spring brake cylinder is released and the parking brake is applied via the spring tension of the accumulator spring.
[0003] For example, DE 10 2014 002 112 A1 discloses a combined service brake cylinder and spring brake cylinder. In this arrangement, the spring brake cylinder and the service brake cylinder are arranged coaxially one behind the other and connected to each other via an intermediate flange. However, this arrangement requires a relatively long installation space in the wheel arch of a commercial vehicle, which may cause space problems.
[0004] In order to solve this problem, DE 10 2014 002 112 A1 proposes a combined service brake cylinder and spring brake cylinder, wherein the service brake cylinder and the spring brake cylinder are placed laterally adjacent to each other and the accumulator spring is arranged around the service brake cylinder. In this case, the service brake piston is guided in the spring brake piston and axially guided thereon, and the spring brake piston has a radially inwardly extending peripheral edge, which abuts against the end face annular surface of the service brake piston in order to drive the service brake piston together with the service brake piston rod into the application position when the parking brake is applied. However, this arrangement also has some disadvantages. Firstly, the radially inwardly extending peripheral edge of the spring brake piston is loaded by the service brake pressure in the service brake chamber, so that during service braking, a force is generated at the spring brake piston that opposes the spring brake release pressure in the spring brake chamber, and the force loads the spring brake piston in the application direction of the parking brake. Secondly, the effective area of the spring brake piston on which the parking brake release pressure can act to keep the parking brake released is relatively small, resulting in a higher required parking brake release pressure or a lower spring rate of the accumulator spring, with further disadvantages in compressed air consumption or parking brake force. Summary of the invention
[0005] The object of the present invention is therefore to provide a combined service brake cylinder and spring brake cylinder of short and rigid design, with low compressed air consumption and independent parking and service brake functions. Likewise, a pneumatic or electro-pneumatic vehicle brake is provided, which has at least one such combined service brake cylinder and spring brake cylinder.
[0006] This object is solved by the features of claims 1, 7 and 29. Advantageous further embodiments are subject matter of the dependent claims.
[0007] The invention is based on a combined service brake cylinder and spring brake cylinder for operating a service brake and a parking brake, comprising:
[0008] a) a spring brake cylinder with a spring brake cylinder housing, a spring brake piston and at least one accumulator spring, which loads the spring brake piston in the application direction of the parking brake, wherein the spring brake piston is displaceably guided on a radial inner circumferential surface of the spring brake cylinder housing and the spring brake piston and the spring brake cylinder housing delimit a spring brake chamber, which can be pressurized by the parking brake pressure;
[0009] b) a separate service brake cylinder, and a service brake piston, at least the service brake piston delimiting a service brake chamber, which can be pressurized by the service brake pressure, wherein
[0010] c) Viewed radially, the service brake cylinder is arranged in the spring brake cylinder housing, wherein
[0011] d) The service brake piston is connected to the service brake piston rod.
[0012] When viewed in the radial direction, the service brake cylinder is arranged in the spring brake cylinder, which may mean that, viewed in the radial direction, the service brake cylinder is completely arranged in the spring brake cylinder and is enclosed by the wall of the spring brake cylinder. Furthermore, this may also mean that, when viewed in the axial direction, the service brake cylinder is arranged partially or completely in the spring brake cylinder. "Radial" and "axial" particularly refer to a common longitudinal axis of the combined service brake cylinder and spring brake cylinder, wherein the service brake cylinder and the spring brake cylinder are particularly arranged coaxially.
[0013] Furthermore, for example, the spring brake cylinder housing of the spring brake cylinder can comprise a closed housing of the spring brake cylinder, in which the service brake cylinder is then completely accommodated.
[0014] According to a first aspect of the present invention, it is provided that:
[0015] e) The service brake cylinder is pot-shaped and has a cylindrical wall portion extending parallel to the spring brake cylinder housing and a first bottom portion connected to the cylindrical wall portion, wherein
[0016] f) the service brake piston is displaceably guided directly on the radially inner peripheral surface of the cylindrical wall portion of the service brake cylinder, and wherein
[0017] g) The first bottom portion of the service brake cylinder is provided with a central opening, through which the service brake piston rod protrudes.
[0018] According to a second aspect of the present invention, it is provided that:
[0019] e) The service brake cylinder is pot-shaped and has a cylindrical wall portion extending parallel to the spring brake cylinder housing and a second bottom portion connected to the cylindrical wall portion, wherein
[0020] f) the service brake piston is displaceably guided directly on the radially inner peripheral surface of the cylindrical wall portion of the service brake cylinder, and wherein
[0021] g) The second bottom part of the service brake cylinder forms the bottom of the spring brake cylinder housing.
[0022] For example, "direct guidance" here means that the radially outer peripheral surface of the service brake piston is guided on the radially inner peripheral surface of the cylindrical wall portion of the service brake cylinder. In this case, a sealing element is preferably arranged between the radially outer peripheral surface of the service brake piston and the radially inner peripheral surface of the cylindrical wall portion of the service brake cylinder, which sealing element, in addition to its sealing function, then also performs a guiding function for the service brake piston.
[0023] With this arrangement, on the one hand, the length of the combined service brake cylinder and spring brake cylinder is shorter, since the service brake cylinder is arranged radially and in particular also axially and in particular completely within the spring brake cylinder.
[0024] On the other hand, since the service brake piston is directly guided on the radial inner circumferential surface of the service brake cylinder in a displaceable manner, or since the diaphragm cooperating with the service brake piston is attached to the service brake cylinder and / or the spring brake cylinder, the disadvantages of the above-mentioned prior art regarding the spring brake piston being affected by the service brake pressure existing in the service brake chamber are avoided.
[0025] Last but not least, the spring brake piston can then also have a larger effective area relative to the parking brake pressure, so that the pressure level of the parking brake release pressure can be reduced, thereby reducing energy consumption. The parking brake release pressure is the pressure at which the parking brake is released against the action of the at least one accumulator spring.
[0026] The service brake piston connected to the service brake piston rod actuates the service brake when the service brake chamber is pressurized by the service brake pressure, and releases the service brake when the service brake chamber is exhausted or depressurized. In particular, the service brake piston rod may be composed of a cylindrical or rod-shaped body, to the end of which the service brake piston is then attached, and from which the service brake piston protrudes radially outward.
[0027] Since the service brake cylinder according to both aspects of the present invention is pot-shaped and has a cylindrical wall portion and a first bottom portion or a second bottom portion extending in parallel into the spring brake cylinder, wherein the service brake piston displacement is guided directly on the radial inner peripheral surface of the cylindrical wall portion of the service brake cylinder, the design of the service brake cylinder is more rigid. In particular, the cylindrical wall portion and the first bottom portion or the second bottom portion are formed as a single piece. In addition, the first bottom portion or the second bottom portion also has multifunctionality, the first bottom portion is used to guide the service brake piston rod, and the second bottom portion is used to cover the spring brake cylinder housing.
[0028] According to a preferred embodiment of the first aspect, the service brake chamber is delimited by the service brake piston, a cylindrical wall portion of the service brake cylinder and a first cover of the spring brake cylinder.
[0029] According to another preferred embodiment of the first aspect, a first actuating element of the emergency release device is provided, which protrudes out of the central opening of the first cover.
[0030] According to another preferred embodiment of the first aspect, the first cover is provided with an air port for the service brake chamber.
[0031] A particularly short combined service brake cylinder and spring brake cylinder is produced according to another preferred embodiment of the first aspect if, preferably, in the released position of the parking brake, i.e. in particular when the spring brake chamber is pressurized, the spring brake piston contacts the first bottom part of the service brake cylinder, in particular its side facing away from the spring brake chamber contacts the first bottom part of the service brake cylinder.
[0032] According to another preferred embodiment of the first aspect, a first return spring chamber is formed between the service brake piston and the first bottom portion of the service brake cylinder, the first return spring chamber accommodating a return spring that loads the service brake piston to the service brake release position.
[0033] According to a preferred embodiment of the second aspect, the service brake chamber is delimited by the service brake piston, the cylindrical wall portion of the service brake cylinder and the second bottom portion of the service brake cylinder.
[0034] According to another embodiment of the second aspect, in a service brake release position in which the service brake is released, the service brake piston contacts the second bottom portion of the service brake cylinder.
[0035] According to another embodiment of the second aspect, a second return spring chamber is formed between the service brake piston and the spring brake piston, the second return spring chamber accommodating a return spring that loads the service brake piston to the service brake release position.
[0036] According to a further embodiment of the second aspect, a first actuating element of the emergency release device is provided, which protrudes out of a central opening of the second bottom part of the service brake cylinder.
[0037] According to a further embodiment of the second aspect, the at least one accumulator spring is supported on one side on the spring brake piston and on the other side on the second bottom part of the service brake cylinder.
[0038] According to a further embodiment of the second aspect, the second bottom portion of the service brake cylinder is provided with an air port for the service brake chamber.
[0039] According to a preferred embodiment of the first and second aspects, the service brake piston rod actuates the service brake when the service brake chamber is pressurized, and releases the service brake when the service brake chamber is depressurized or exhausted.
[0040] According to a preferred embodiment of the first and second aspects, the first (free) end of the cylindrical wall portion of the service brake cylinder is in particular formed by an edge and the second end of the cylindrical wall portion is connected to the first bottom portion or the second bottom portion.
[0041] According to a preferred embodiment of the first and second aspects, the spring brake piston has a central opening, the central opening has a bearing, the spring brake piston is axially guided on the service brake piston rod by means of the bearing, and / or the service brake piston rod and the spring brake piston are axially displaceable relative to each other by means of the bearing.
[0042] According to a preferred embodiment of the first and second aspects, the service brake piston rod has a radial projection, in particular on its radial outer circumference, which forms an axial stop for the spring brake piston.
[0043] According to a preferred embodiment of the first and second aspects, the radial protrusion is arranged and formed on the service brake piston rod so that:
[0044] a) when the spring brake chamber is vented or depressurized, the spring brake piston brings the service brake piston rod to the parking brake application position by abutting against the radial projection, and / or
[0045] b) when the spring brake chamber and the service brake chamber are pressurized, the radial projection disengages from the spring brake piston and thereby the service brake piston rod is brought to the service brake apply position, and / or
[0046] c) When the spring brake chamber is exhausted or depressurized and when the service brake chamber is pressurized, the spring brake piston brings the service brake piston rod to the application position of the parking brake and the service brake by abutting the radial protrusion and the service brake piston.
[0047] According to a preferred embodiment of the first and second aspects, the spring brake piston extends from the central opening beyond the radial outer peripheral surface of the service brake cylinder to the radial inner peripheral surface of the spring brake cylinder as viewed in the radial direction. A particularly large effective area of the spring brake piston with respect to the parking brake release pressure is then achieved.
[0048] According to a preferred embodiment of the first and second aspects, a spring chamber as an annular chamber is formed between the radial outer peripheral surface of the service brake cylinder, in particular the radial outer peripheral surface of its cylindrical wall portion, and the spring brake cylinder, and at least one accumulator spring is arranged in the spring chamber.
[0049] According to a preferred embodiment of the first and second aspects, a ventilation device is provided, which comprises at least a ventilation valve, which is arranged in a through opening of the service brake piston and is controlled by the service brake pressure in the service brake chamber in the following manner, so that when the service brake chamber is exhausted or depressurized, the ventilation valve is in an open position, in which the first flow connection between the service brake chamber and the return spring chamber is opened, and when the service brake chamber is pressurized, the ventilation valve is brought from the open position to a closed position, in which the first flow connection is blocked.
[0050] According to a preferred embodiment of the first aspect and the second aspect, the vent valve includes a valve seat and a valve body, wherein the valve body is biased away from the valve seat to an open position of the vent valve by a spring device, and the service braking pressure pushes the valve body against the valve seat against the action of the spring device to move the vent valve from the open position to the closed position.
[0051] According to a preferred embodiment of the first and second aspects, the vent device further comprises a second flow connection between the return spring chamber and the spring chamber and a third flow connection between the spring chamber and the atmosphere.
[0052] For example, the second flow connection can comprise a through-opening in a cylindrical wall section or in the first or second bottom section of the service brake cylinder.
[0053] For example, the third flow connection may comprise a through opening in a wall or cover of the spring brake cylinder. In addition, the third flow connection may comprise a filter and / or a valve, which prevents dirt and moisture from entering the spring brake cylinder from the outside.
[0054] According to a preferred embodiment of the first and second aspects, when the service brake chamber is pressurized, the volume of the return spring chamber is reduced, thereby generating a first air flow through the second flow connection and the third flow connection.
[0055] According to a preferred embodiment of the first and second aspects, when the spring brake chamber is pressurized, the volume of the spring chamber decreases, thereby generating a second air flow through the third flow connection or through the first flow connection.
[0056] According to preferred embodiments of the first and second aspects, when the spring brake chamber is exhausted or depressurized, the volume of the spring chamber increases, thereby generating a third air flow through the first flow connection and the second flow connection.
[0057] The operation of the ventilation device which can then be described by example is as follows:
[0058] For example, when the service brake chamber is pressurized, the vent valve is in a closed position so that no compressed air can enter the return spring chamber from the service brake chamber. On the other hand, the moving service brake piston reduces the volume of the return spring chamber, thereby generating a first air flow, which then enters the atmosphere through the second flow connection and the third flow connection. Then, there is no excess pressure in the return spring chamber to hinder the movement of the service brake piston in the service brake application direction.
[0059] On the other hand, when the spring brake chamber is pressurized to release the parking brake, the volume of the spring brake chamber is reduced, thereby generating a second air flow, which can then enter the atmosphere through the third flow connection or the first flow connection. Then, there is no excess pressure in the spring chamber to hinder the movement of the spring brake piston in the parking brake release direction.
[0060] According to a preferred embodiment of the first and second aspects, a second actuating element is provided at the first end of the service brake piston rod, the second actuating element extending through an opening of the spring brake cylinder housing or a second cover of the spring brake cylinder housing, wherein the second actuating element is provided to actuate the brake caliper, and wherein the second end of the service brake piston rod is connected to the service brake piston.
[0061] According to a preferred embodiment of the first and second aspects, the second actuating element, in particular the second actuating element formed as a pusher, is pivotally received in a recess at the first end of the service brake piston rod. The pusher can be spring loaded in the central position. In addition, the spring can be a conical spring, which spring loads the pusher in a specific position. The specific position is a position in which the pusher can be in operative contact with the actuating member of the brake caliper to actuate the brake caliper.
[0062] According to a third aspect of the present invention, a pneumatic or electro-pneumatic vehicle brake comprises at least one combined service brake cylinder and spring brake cylinder according to the above description.
[0063] Advantageous further embodiments of the invention are apparent from the claims, the description and the drawings. The advantages of the features mentioned in the preamble of this specification and the advantages of the combination of several features are merely exemplary and may produce effects alternatively or cumulatively, without these advantages having to be achieved by the embodiments according to the invention. Other features can be found in the drawings, in particular the illustrated geometric structures of several components and the relative sizes to each other, as well as their relative arrangement and effective connection. The features of different embodiments of the invention or the combination of features of different patent claims may also deviate from the selected back-reference relationship of the patent claims and be proposed thereby. This also applies to such features shown in the separate drawings or mentioned in their description. These features may also be combined with the features of different patent claims. Similarly, for other embodiments of the invention, the features listed in the patent claims may be omitted. BRIEF DESCRIPTION OF THE DRAWINGS
[0064] Preferred embodiments of the present invention are shown below in the accompanying drawings and will be explained in more detail in the following description. The accompanying drawings show:
[0065] Figure 1 is a perspective view of a preferred embodiment of a combined service brake cylinder and a spring brake cylinder of an electro-pneumatic brake system for a commercial vehicle according to the first aspect, seen from an end face from which an actuating element for a disc brake can be seen;
[0066] Figure 2 The actuating element of the emergency release device is viewed from the other end from which it protrudes. Figure 1 A perspective view of a combined service brake cylinder and a spring brake cylinder;
[0067] Figure 3 yes Figure 1 and Figure 2 A sectional view of a combined service brake cylinder and a spring brake cylinder when the parking brake and the service brake are released, in particular during driving conditions of a commercial vehicle;
[0068] Figure 4 yes Figure 1 and Figure 2 A cross-sectional view of a combined service brake cylinder and a spring brake cylinder with the parking brake released but the service brake applied, particularly during a driving condition of a commercial vehicle;
[0069] Figure 5 yes Figure 1 and Figure 2A cross-sectional view of a combined service brake cylinder and a spring brake cylinder with the parking brake applied, in particular during a parking situation of a commercial vehicle;
[0070] Figure 6 is a cross-sectional view of a vent valve of a combined service brake cylinder and a spring brake cylinder in an open position;
[0071] Figure 7 yes Figure 6 A cross-sectional view of the vent valve in a closed position;
[0072] Figure 8 is a cross-sectional view of a preferred embodiment of a combined service brake cylinder and a spring brake cylinder of an electric-pneumatic brake system for a commercial vehicle according to the second aspect. DETAILED DESCRIPTION
[0073] A combined pneumatic service brake cylinder and spring brake cylinder 1 with a service function and a parking brake function as described below is usually arranged on the wheels of the rear axle of a commercial vehicle and usually has two compressed air ports 2, 5. The first compressed air port 2 controls the parking brake function and, in the driving state of the commercial vehicle, it is under the effect of the parking brake release pressure for compressing the accumulator spring 3 of the spring brake cylinder 4. The second compressed air port 5 controls the service brake function and, in particular in the driving state, can be pressurized via the service brake to brake the commercial vehicle. In this case, the service brake function is performed by the service brake cylinder 6 designed as a brake piston cylinder. If the commercial vehicle is to be parked, the spring brake cylinder 4 is vented or depressurized and the parking brake is applied via the spring tension of the accumulator spring 3.
[0074] For example, in an electro-pneumatic brake system, the pressure for the two compressed air ports 2, 5 is generated by a solenoid valve device (not shown here), which is supplied with compressed air at a supply pressure from at least one compressed air supply device. In order to coordinately control or regulate the service brake pressure or parking brake pressure introduced into the two compressed air ports 2, 5, the solenoid valve device is controlled by an electronic control system.
[0075] Figure 1 A perspective view of a preferred embodiment of a combined service brake cylinder and spring brake cylinder 1 of an electro-pneumatic brake system for a commercial vehicle according to the first aspect of the invention is shown, seen from an end face from which a second actuating element 7 for actuating a brake caliper, for example a disc brake, can be seen. Figure 2 The first actuating element 8 of the emergency release device 9 is shown as viewed from the other end face thereof. Figure 1 A perspective view of a combined service brake cylinder and spring brake cylinder 1.
[0076] like Figure 3As shown, this is when the parking brake and the service brake are released, especially in the driving situation of commercial vehicles Figure 1 and Figure 2 sectional view of a service brake cylinder and a spring brake cylinder 1, the combined service brake cylinder and spring brake cylinder 1 comprises: a spring brake cylinder 4; a spring brake piston 10, in which the spring brake piston is axially slidably guided; and an accumulator spring 3, which loads the spring brake piston 10 to the application position of the parking brake.
[0077] The spring brake cylinder 4 comprises a substantially cylindrical spring brake cylinder housing 11, which, for example, here has two covers 12, 13 attached to the end faces: a first cover 12 and a second cover 13, wherein the second actuating element 7 for the disc brake protrudes from a central through-opening of the second cover 13 and the first actuating element 8 of the emergency release device 9 protrudes from a central through-opening of the first cover 12. Alternatively, the spring brake cylinder housing 11 can also be pot-shaped, and then, for example, there is only one cover. Typically, the spring brake cylinder housing 11 forms a closed housing of the spring brake cylinder 4, in which, for example, the service brake cylinder 6 is completely included. Furthermore, the service brake cylinder 6 or the service brake cylinder housing 17 of the service brake cylinder 6 is preferably a separate part of the combined service brake cylinder and spring brake cylinder 1.
[0078] The spring brake piston 10 is axially displaceably guided on the radial inner circumferential surface of the spring brake cylinder 4 or the spring brake cylinder housing 11, wherein a first moving seal 14 is arranged between the radial outer edge of the spring brake piston 10 and the radial inner circumferential surface of the spring brake cylinder 4 or the spring brake cylinder housing 11, the first moving seal 11 being arranged to be connected to the radial outer edge of the spring brake piston 10 here and in addition to the sealing function it also performs a guiding function for the spring brake piston 10.
[0079] With the side of the spring brake piston facing away from the accumulator spring 3, the spring brake piston 10 delimits a spring brake chamber 15, which can be pressurized and vented or depressurized by the parking brake pressure via the first compressed air port 2. The accumulator spring 3 is then supported with one end thereof on the other side of the spring brake piston 10, and the other end thereof is supported on the spring brake cylinder housing 11. For example, the first compressed air port 2 is formed in the second cover 13. However, it can also be formed in the bottom of the spring brake cylinder housing 11 of the spring brake cylinder or spring brake cylinder 4 if the spring brake cylinder housing 11 is, for example, pot-shaped.
[0080] The accumulator spring 3 is then accommodated in a spring chamber 16, which is formed here as an annular chamber and is located radially outside relative to the service brake cylinder 6, and which is radially inwardly bounded or limited by the radially outer peripheral surface of the service brake cylinder housing 17 of the service brake cylinder 6, and radially outwardly bounded or limited by the radially inner peripheral surface of the spring brake cylinder housing 11. The spring chamber 16 is axially bounded or limited by the spring brake piston 10 and the spring brake cylinder housing 11.
[0081] The cylindrical wall portion 37 of the service brake cylinder 6 or the service brake cylinder housing 17 directly guides the axially displaceable service brake piston 18, which delimits a service brake chamber 19 which can be pressurized and vented or depressurized with service brake pressure via the second compressed air port 5.
[0082] The service brake cylinder 6 or the service brake cylinder housing 17 of the service brake cylinder 6 is preferably arranged completely in the radial direction and here, for example, also in the axial direction in the spring brake cylinder 4 or the spring brake cylinder housing 11 of the spring brake cylinder 4. Furthermore, the service brake piston 18 is guided axially slidably directly on the radial inner peripheral surface of the cylindrical wall section 37 of the service brake cylinder 6 or of the service brake cylinder housing 17. This direct guidance includes the arrangement of a second moving seal 20 therebetween, which is connected here to the radial outer edge of the service brake piston 18 and which, in addition to the sealing function, also performs a guiding function for the service brake piston 18.
[0083] According to another embodiment not shown here, the diaphragm cooperating with the service brake piston 18 can be attached to the service brake cylinder 6 and / or the spring brake cylinder 4 via its radially outer edge. The service brake cylinder 6 is then a so-called diaphragm cylinder. In this case, the service brake piston 18, which then has a smaller radial extension, forms a pressure plate (e.g. a central pressure plate) on which the diaphragm acts, which is connected to the diaphragm or on which the diaphragm is supported. For example, the diaphragm can be fixed to the service brake cylinder 6 and the spring brake cylinder 4 or in a joint between the two. For example, it is conceivable that the radially outer edge of the diaphragm is clamped between the service brake cylinder 6 and the spring brake cylinder 4. Reference Figure 3 The radially outer edge of the diaphragm can be clamped between the first cover 12 of the spring brake cylinder 4 and the edge 21 provided at one end of the cylindrical wall portion 37 of the pot-shaped service brake cylinder 6. In addition to the cylindrical wall portion 37, the pot-shaped service brake cylinder 6 also includes a first bottom portion 23a, which is connected to the other end of the cylindrical wall portion 37.
[0084] In both embodiments, the service brake piston 18 is connected to a service brake piston rod 22, which is made hollow here, for example, in order to receive the emergency release device 9 inside it. The service brake piston rod 22 then actuates the service brake via the second actuating element 7, in particular a pusher pivotally received in a recess 39 at the first end of the service brake piston rod 22, when the service brake chamber 19 is pressurized by the service brake application pressure, and releases the service brake when the service brake chamber 19 is vented. The end of the service brake piston rod 22 facing the service brake chamber 19 can then project radially outwards away from the service brake piston rod 22 in a mushroom-like manner. Furthermore, if the pusher 7 is pivotally received in the recess 39 at the first end of the service brake piston rod 22, the pusher 7 can follow the lever movement of the brake caliper by a deflection movement. The pusher 7 can be spring-loaded in the center position.
[0085] The second compressed air port 5 (formed, for example, in the first cover 12) is then used to pressurize / exhaust the service brake chamber 19. As described above, an emergency release device 9 (not described in detail here) for manual emergency release of the combined service brake cylinder and spring brake cylinder 1 can be accommodated or integrated in the service brake piston rod 22. By turning the second actuating element 8 extending from the combined service brake cylinder and spring brake cylinder 1, the service brake piston rod 22 can then be screwed into the release position of the parking brake or service brake. This manual emergency release is necessary, in particular, if no more parking brake release pressure can be generated in the spring brake chamber 15, for example, due to an electrical fault in the solenoid valve device or its control system, or also in the event of a power failure.
[0086] As already described above, the service brake cylinder 6 or the service brake cylinder housing 17 is of pot-shaped design and has a cylindrical wall section 37 extending parallel to the spring brake cylinder 4 or the spring brake cylinder housing 1, and a first bottom section 23a. For example, the first bottom section 23a is provided with a central opening through which the service brake piston rod 22 then protrudes into the spring brake cylinder 4 or the spring brake chamber 15. Furthermore, the service brake piston rod 22 centrally penetrates the spring brake chamber 15 and then receives the second actuating element 7 for the caliper of the disc brake in a recess 39 at its end facing the caliper of the disc brake and protruding from the spring brake cylinder housing 11 through the through-opening.
[0087] Here, a first return spring chamber 24a is formed between the service brake piston 18 and the first bottom part 23a of the service brake cylinder 6, which has a return spring 25, which loads the service brake piston 18 into the service brake release position. In addition, the service brake piston rod 22 penetrates the first return spring chamber 24a axially and centrally.
[0088] As described above, the pot-shaped service brake cylinder 6 has a free edge 21 which is fixed to the spring brake cylinder 4, in particular in the region where the end-face first cover 12 is fixed to the spring brake cylinder 4, whereby this first cover 12 also delimits or closes the service brake chamber 19. The service brake chamber 19, which can then be pressurized and depressurized, is delimited by the cylindrical wall portion 37 of the service brake cylinder housing 17, the first cover 12 of the spring brake cylinder 4 and the service brake piston 18 or, alternatively, by the above-mentioned diaphragm in the case of the above-mentioned diaphragm cylinder used as the service brake cylinder 6.
[0089] like Figure 3 Preferably, in the parking brake release position, i.e. when the spring brake chamber 15 is pressurized, the spring brake piston 10 contacts the first bottom portion 23a of the service brake cylinder 6 from the outside relative to the service brake cylinder 6 with its side facing away from the spring brake chamber 15. This contact is caused by the parking brake release pressure acting on the spring brake piston 10.
[0090] For example, the spring brake piston 10 comprises a central opening with a bearing 26, by which the spring brake piston 10 is axially guided on the service brake piston rod 22. The bearing 26 thus allows an axial movement of the service brake piston rod 22 and the spring brake piston 10 relative to each other. For example, the bearing 26 is designed as a sealed bearing.
[0091] Then, viewed in the radial direction, the spring brake piston 10 extends from the bearing 26 or from the central opening of the spring brake piston 10 beyond the radial outer peripheral surface of the service brake cylinder 6 or the service brake cylinder housing 17 to the radial inner peripheral surface of the spring brake cylinder 4 or the spring brake cylinder housing 11. The effective surface of the spring brake piston 10 on which the parking brake pressure or the parking brake release pressure acts is located on the side of the spring brake piston 10 facing the spring brake chamber 15, and then the effective surface also extends from the bearing 26 or from the central opening of the spring brake piston 10 to the radial inner peripheral surface of the spring brake cylinder 4 or the spring brake cylinder housing 11. The effective surface of the spring brake piston 10 on which the parking brake pressure or the parking brake release pressure acts is located on the side of the spring brake piston 10 facing the spring brake chamber 15. The effective surface of the spring brake piston 10 also extends from the bearing 26 or from the central opening of the spring brake piston 10 beyond the radial outer peripheral surface of the service brake cylinder 6 or the service brake cylinder housing 17 to the radial inner peripheral surface of the spring brake cylinder 4 or the spring brake cylinder housing 11.
[0092] Likewise Figure 3As shown, the service brake piston rod 22 has, in particular at its radial outer periphery, a radial projection 27 which forms an axial stop for the bearing 26 or for the central opening of the spring brake piston 10. This radial projection 27 is arranged on the service brake piston rod 22, for example, so that when the spring brake chamber 15 is vented to apply the parking brake, the spring brake piston 10 brings the service brake piston rod 22 into the spring brake application position by abutting against the radial projection 27, as shown in FIG. Figure 5 It is not important whether the service brake chamber 19 is additionally pressurized to bring the service brake piston rod 22 to the application position of the service brake, because the service brake piston rod 22 has already moved to the application position due to the release of the accumulator spring 3. However, in order not to overload the disc brake mechanism, a parallel application of the parking brake and the service brake may be undesirable.
[0093] On the other hand, when the service brake piston rod 22 is brought to the service brake application position by pressurizing the service brake chamber 19, while the spring brake chamber 15 continues to be pressurized to release the parking brake, the radial projection 27 of the service brake piston rod 22 is out of contact or engagement with the spring brake piston 10. Figure 4 shown.
[0094] Further, by abutting the radial protrusion 27, the spring brake piston 10 together with the service brake piston 18 can move the service brake piston rod 22 to the spring brake application position and the service brake application position when the spring brake chamber 15 is exhausted and the service brake chamber 19 is pressurized, as shown in FIG. Figure 5 It can be easily imagined that the service brake piston rod 22 is therefore connected to the service brake piston 18 and acts axially on the second actuating element 7 which actuates both the service brake and the parking brake, respectively, by applying the disc brake.
[0095] Particularly preferably, a ventilation device is also provided, which comprises, for example, a ventilation valve 28 which is arranged here, for example, in a through-opening of the service brake piston 18 and is controlled by the service brake pressure in the service brake chamber 19 .
[0096] from Figure 6 and Figure 7 It can be seen that the vent valve 28 may include, for example, a valve seat 30 formed in the valve body 29 and a valve body 32 biased away from the valve seat 30 by a spring 31 to an open position of the vent valve 8, the valve body 32 being pushed against the valve seat 30 by the service brake pressure, which acts on the valve body against the force of the spring 31 to move the vent valve 28 from the spring-biased open position to the closed position. Then, Figure 6 The open position of the vent valve 28 is shown, Figure 7 The closed position of the vent valve is shown.
[0097] When the service brake chamber 19 is depressurized, the vent valve 28 can then be in an open position in which the first flow connection 33 through the through-opening between the service brake chamber 19 and the first return spring chamber 24a is open due to the bias of the spring 31. When the service brake chamber 19 is pressurized, the vent valve 28 then moves from the open position to a closed position in which the first flow connection 33 through the through-opening is blocked, since the flow caused by the service brake pressure first passes through the radially outer gap 38 between the valve body 32 and the valve base 29 and then also through the through-opening in the service brake piston. However, after a certain period of time, i.e. in the transition phase, the pressure exerted on the valve body 32 becomes so great that the sealing portion 34 of the valve body 32 comes into contact with the valve seat 30, thereby closing the first flow connection 33 or the through-opening. This prevents the compressed air from then still flowing from the service brake chamber 19 into the first return spring chamber 24a.
[0098] Furthermore, the second flow connection 35 between the first return spring chamber 24 a and the spring chamber 16 , and the third flow connection 36 between the spring chamber 16 and the atmosphere can be components of the ventilation device.
[0099] For example, the second flow connection 35 can include a through-opening in the cylindrical wall 37 or in the bottom 23 of the service brake cylinder 6 or of the service brake cylinder housing 17. Figure 1 The third flow connection 36 indicated in the figure can comprise a through opening in the spring brake cylinder housing 11, in particular a through opening on the front side. Thus, the second flow connection 35 and the third flow connection 36 here lead to the spring chamber 16 and are also connected to each other via the spring chamber 16.
[0100] Furthermore, the third flow connection 36 can comprise a filter and / or a valve, for example in a cover, in order to prevent dirt and moisture from entering the spring brake cylinder 4 from the outside.
[0101] Furthermore, when the spring brake chamber 15 is decompressed, the volume of the spring chamber 16 increases, thereby generating a third air flow through the first flow connection 33 and the second flow connection 35 .
[0102] The operation of the ventilation device can then be illustrated as follows:
[0103] For example, as described above, when the service brake chamber 19 is pressurized, the vent valve 28 is in the closed position so that no compressed air can enter the first return spring chamber 24a from the service brake chamber 19. On the other hand, the volume of the first return spring chamber 24a is reduced by displacing or moving the service brake piston 18, thereby generating a first air flow, which then enters the atmosphere through the second flow connection 35 and the third flow connection 36. Then, there is no excessive pressure in the first return spring chamber 24a to hinder the movement of the service brake piston 18 in the service brake application direction.
[0104] On the other hand, when the service brake chamber 19 is depressurized, the return spring 25 pushes the service brake piston 18 back, and the volume of the first return spring chamber 24a increases, and a vacuum is usually formed there. But then, as described above, the vent valve 28 can then be in an open position, in which the first flow connection 33 through the through opening between the service brake chamber 19 and the first return spring chamber 24a is open due to the bias of the spring 31. Therefore, air can enter the first return spring chamber 24a from the service brake chamber 19. Then, there is no vacuum in the first return spring chamber 24a to hinder the movement of the service brake piston 18 in the service brake release direction.
[0105] When the spring brake chamber 15 is pressurized to release the spring brake, the volume of the spring chamber 16 is reduced, thereby generating a second air flow, which can then enter the atmosphere through the third flow connection 36. There is then no excess pressure in the spring chamber 16 to hinder the movement of the spring brake piston 10 in the parking brake release direction.
[0106] If, on the other hand, the volume of the spring chamber 16 increases when the spring brake chamber 15 is vented to apply the spring or parking brake, air can be sucked in from the outside through the third flow connection 36 due to the resulting pressure drop in order to provide pressure equalization there.
[0107] Figure 8 A cross-sectional view of a preferred embodiment of a combined service brake cylinder and a spring brake cylinder of an electric-pneumatic brake system for a commercial vehicle according to the second aspect is shown. Figure 8 In, with Figures 1 to 7 The same reference numerals are used to indicate identical parts and components having the same function.
[0108] As in the first aspect, the service brake cylinder is pot-shaped and has a cylindrical wall portion 37 extending parallel to the spring brake cylinder housing 11 and a (here second) bottom portion 23b connected to the cylindrical wall portion 37. In addition, the service brake piston 18 is displaceably guided directly on the radial inner peripheral surface of the cylindrical wall portion 37 of the service brake cylinder 6.
[0109] However, unlike the embodiment of the first aspect, the second bottom portion 23b of the service brake cylinder 6 forms the bottom or cover of the spring brake cylinder housing 11. Furthermore, according to the second aspect, the service brake chamber (19) is defined by the service brake piston 18, the cylindrical wall portion of the service brake cylinder 6, and the second bottom portion 23b of the service brake cylinder 6. Furthermore, in the service brake release position where the service brake is released, the service brake piston 18 contacts the second bottom portion 23b of the service brake cylinder 6.
[0110] According to the second aspect, a second return spring chamber 24b is formed between the service brake piston 18 and the spring brake piston 10, which accommodates a return spring 25 which loads the service brake piston 18 into the service brake release position. In addition, there is a first actuating element 8 of the emergency release device 9, which here protrudes out of the central opening of the second bottom part 23b of the service brake cylinder 6. Here, the accumulator spring 3 is supported on one side on the spring brake piston 10 and on the other side on the second bottom part 23b of the service brake cylinder. In addition, here, the second bottom part 23b of the service brake cylinder 6 is provided with a second compressed air port 5 for the service brake chamber 19.
[0111] As in the first aspect, a ventilation device is preferably also provided, which comprises, for example, a ventilation valve 28, which is also preferably arranged in the through-opening of the service brake piston 18 and is controlled by the service brake pressure in the service brake chamber 19. Furthermore, in the second aspect of the invention, a first, a second and a third flow connection are also provided. Therefore, with regard to the description of the function of this ventilation device, reference is made to the first aspect. Furthermore, all other functions of the combined service brake cylinder and spring brake cylinder according to the second aspect are the same as in the first aspect.
[0112] Reference numerals list
[0113] 1Combined service brake cylinder and spring brake cylinder
[0114] 2First compressed air port
[0115] 3Accumulator spring
[0116] 4 spring brake cylinders
[0117] 5 Second compressed air port
[0118] 6 Service brake cylinders
[0119] 7 Second actuating element
[0120] 8First actuating element
[0121] 9 Emergency release device
[0122] 10 Spring brake piston
[0123] 11 Spring brake cylinder housing
[0124] 12 First Cover
[0125] 13 Second Cover
[0126] 14 First Motion Seals
[0127] 15 Spring brake chamber
[0128] 16 Spring chamber
[0129] 17 Service brake cylinder housing
[0130] 18 Service brake piston
[0131] 19 Service brake chamber
[0132] 20 Second motion seal
[0133] 21 Service brake cylinder edge
[0134] 22 Service brake piston rod
[0135] 23a First bottom portion
[0136] 23b Second bottom section
[0137] 24a First return spring chamber
[0138] 24b Second return spring chamber
[0139] 25 Return spring
[0140] 26 bearings
[0141] 27 radial protrusion
[0142] 28 Ventilation valve
[0143] 29 Valve body
[0144] 30 valve seat
[0145] 31 Spring
[0146] 32 Valve body
[0147] 33 first flow connection
[0148] 34 Sealing section
[0149] 35 Second flow connection
[0150] 36 Third flow connection
[0151] 37 cylindrical wall portion
[0152] 38 Gap
[0153] 39 Recess
Claims
1. A combined service brake cylinder and spring brake cylinder (1) for operating a service brake and a parking brake, the combined service brake cylinder and spring brake cylinder comprising: a) a spring brake cylinder (4) having a spring brake cylinder housing (11), a spring brake piston (10) and at least one accumulator spring (3), the accumulator spring loading the spring brake piston (10) in the application direction of the parking brake, wherein the spring brake piston (10) is displaceably guided on the radial inner circumferential surface of the spring brake cylinder housing (11), and the spring brake piston (10) and the spring brake cylinder housing (11) delimit a spring brake chamber (15) which can be pressurized by the parking brake pressure, b) a separate service brake cylinder (6), and a service brake piston (18), at least the service brake piston (18) delimiting a service brake chamber (19) which can be pressurized by a service brake pressure, wherein c) Viewed in the radial direction, the service brake cylinder (6) is arranged in the spring brake cylinder housing (11), wherein d) The service brake piston (18) is connected to the service brake piston rod (22), characterized in that e) the service brake cylinder (6) is pot-shaped and has a cylindrical wall portion (37) extending parallel to the spring brake cylinder housing (11) and a first bottom portion (23a) connected to the cylindrical wall portion (37), wherein f) the service brake piston (18) is displaceably guided directly on the radially inner peripheral surface of the cylindrical wall portion (37) of the service brake cylinder (6), and wherein g) The first bottom portion (23a) of the service brake cylinder (6) is provided with a central opening, through which the service brake piston rod (22) protrudes.
2. The combined service brake cylinder and spring brake cylinder according to claim 1, characterized in that: The service brake chamber (19) is delimited by the service brake piston (18), the cylindrical wall portion (37) of the service brake cylinder (6) and a first cover (12) of the spring brake cylinder (4).
3. The combined service brake cylinder and spring brake cylinder according to claim 2, characterized in that: A first actuating element (8) of an emergency release device (9) is provided, the first actuating element protruding from a central opening of the first cover (12).
4. The combined service brake cylinder and spring brake cylinder according to claim 2, characterized in that The first cover (12) is provided with an air port (5) for the service brake chamber (19).
5. Combined service brake cylinder and spring brake cylinder according to one of the preceding claims, characterized in that The spring brake piston (10) contacts the first bottom portion (23a) of the service brake cylinder (6) in a parking brake release position in which the parking brake is released.
6. Combined service brake cylinder and spring brake cylinder according to one of the preceding claims, characterized in that A first return spring chamber (24a) is formed between the service brake piston (18) and the first bottom portion (23a) of the service brake cylinder (6), and the first return spring chamber accommodates a return spring (25) for loading the service brake piston (18) to the service brake release position.
7. A combined service brake cylinder and spring brake cylinder (1) for operating a service brake and a parking brake, the combined service brake cylinder and spring brake cylinder comprising: a) a spring brake cylinder (4) having a spring brake cylinder housing (11), a spring brake piston (10) and at least one accumulator spring (3), the accumulator spring loading the spring brake piston (10) in the application direction of the parking brake, wherein the spring brake piston (10) is displaceably guided on the radial inner circumferential surface of the spring brake cylinder housing (11), and the spring brake piston (10) and the spring brake cylinder housing (11) delimit a spring brake chamber (15) which can be pressurized by the parking brake pressure, b) a separate service brake cylinder (6), and a service brake piston (18), at least the service brake piston (18) delimiting a service brake chamber (19) which can be pressurized by a service brake pressure, wherein c) Viewed in the radial direction, the service brake cylinder (6) is arranged in the spring brake cylinder housing (11), wherein d) The service brake piston (18) is connected to the service brake piston rod (22), characterized in that e) the service brake cylinder (6) is pot-shaped and has a cylindrical wall portion (37) extending parallel to the spring brake cylinder housing (11) and a second bottom portion (23b) connected to the cylindrical wall portion (37), wherein f) the service brake piston (18) is displaceably guided directly on the radially inner peripheral surface of the cylindrical wall portion (37) of the service brake cylinder (6), and wherein g) The second bottom part (23b) of the service brake cylinder (6) forms the bottom or cover of the spring brake cylinder housing (11).
8. The combined service brake cylinder and spring brake cylinder according to claim 7, characterized in that: The service brake chamber (19) is delimited by the service brake piston (18), the cylindrical wall portion (37) of the service brake cylinder (6) and the second bottom portion (23b) of the service brake cylinder (6).
9. Combined service brake cylinder and spring brake cylinder according to one of claims 7 or 8, characterized in that The service brake piston (18) contacts the second bottom portion (23b) of the service brake cylinder (6) in a service brake release position in which the service brake is released.
10. Combined service brake cylinder and spring brake cylinder according to one of claims 7 to 9, characterized in that A second return spring chamber (24b) is formed between the service brake piston (18) and the spring brake piston (10), and the second return spring chamber accommodates a return spring (25) for loading the service brake piston (18) to the service brake release position.
11. The combined service brake cylinder and spring brake cylinder according to any one of claims 7 to 10, characterized in that: A first actuating element (8) of an emergency release device (9) is provided, the first actuating element protruding from a central opening of the second bottom part (23b) of the service brake cylinder (6).
12. The combined service brake cylinder and spring brake cylinder according to any one of claims 7 to 11, characterized in that: The at least one accumulator spring (3) is supported on one side on the spring brake piston (10) and on the other side on the second bottom part (23b) of the service brake cylinder (6).
13. The combined service brake cylinder and spring brake cylinder according to any one of claims 7 to 12, characterized in that: The second bottom portion (23b) of the service brake cylinder (6) is provided with an air port (5) for the service brake chamber (19).
14. Combined service brake cylinder and spring brake cylinder according to one of the preceding claims, characterized in that The service brake piston rod (22) actuates the service brake when the service brake chamber (19) is pressurized, and releases the service brake when the service brake chamber (19) is exhausted.
15. Combined service brake cylinder and spring brake cylinder according to one of the preceding claims, characterized in that The service brake cylinder (6) has edges (21a, 21b) connected to the spring brake cylinder housing (11).
16. A combined service brake cylinder and spring brake cylinder according to any one of the preceding claims, characterised in that The spring brake piston (10) has a central opening with a bearing (26), by means of which the spring brake piston (10) is axially guided on the service brake piston rod (22) and / or by means of which the service brake piston rod (22) and the spring brake piston (10) are axially displaceable relative to each other.
17. The combined service brake cylinder and spring brake cylinder according to claim 16, characterized in that: The service brake piston rod (22) has, in particular, a radial projection (27) on its radial outer circumference, which forms an axial stop for the spring brake piston (10).
18. The combined service brake cylinder and spring brake cylinder according to claim 17, characterized in that: The radial protrusion (27) is arranged and formed on the service brake piston rod (22) in such a way that: a) when the spring brake chamber (15) is exhausted, the spring brake piston (10) brings the service brake piston rod (22) to the parking brake application position by abutting against the radial protrusion (27), and / or b) when the spring brake chamber (15) and the service brake chamber (19) are pressurized, the radial projection (27) disengages from the spring brake piston (10) and thereby the service brake piston rod (22) is brought to the service brake application position, and / or c) When the spring brake chamber (15) is exhausted and when the service brake chamber (19) is pressurized, the spring brake piston (10) brings the service brake piston rod (22) to the application position of the parking brake and the service brake by abutting against the radial protrusion (27) and the service brake piston (18).
19. A combined service brake cylinder and spring brake cylinder according to any one of claims 16 to 18, characterised in that: Viewed in the radial direction, the spring brake piston (10) extends from the central opening beyond the radial outer peripheral surface of the service brake cylinder (6) to the radial inner peripheral surface of the spring brake cylinder (4).
20. A combined service brake cylinder and spring brake cylinder according to any one of the preceding claims, characterised in that A spring chamber (16) is formed as an annular chamber between the radial outer peripheral surface of the service brake cylinder (6) and the spring brake cylinder (4), and the at least one accumulator spring (3) is arranged in the spring chamber.
21. A combined service brake cylinder and spring brake cylinder according to any one of the preceding claims, characterised in that A ventilation device is provided, comprising at least one ventilation valve (28), which is arranged in a through opening of the service brake piston (18) and is controlled by the service brake pressure in the service brake chamber (19) in such a way that when the service brake chamber (19) is vented, the ventilation valve is in an open position, in which a first flow connection (33) between the service brake chamber (19) and the return spring chamber (24) is open, and when the service brake chamber (19) is pressurized, the ventilation valve is brought from the open position to a closed position, in which the first flow connection (33) is blocked.
22. The combined service brake cylinder and spring brake cylinder according to claim 21, characterized in that: The vent valve (28) comprises a valve seat (30) and a valve body (32), wherein the valve body is biased away from the valve seat (30) to the open position of the vent valve (28) by a spring device (31), and the service brake pressure pushes the valve body (32) against the valve seat (30) against the action of the spring device (31) so as to move the vent valve (28) from the open position to the closed position.
23. A combined brake and spring brake cylinder according to claim 21 or 22, characterised in that The ventilation device further comprises a second flow connection (35) between the return spring chamber (24) and the spring chamber (16) and a third flow connection (36) between the spring chamber (16) and the atmosphere.
24. The combined service brake cylinder and spring brake cylinder according to claim 23, characterized in that: When the service brake chamber (19) is pressurized, the volume of the return spring chamber (24) decreases and thereby generates a first air flow which passes through the second flow connection (35) and the third flow connection (36).
25. The combined service brake cylinder and spring brake cylinder according to claim 23 or 24, characterized in that: When the spring brake chamber (15) is pressurized, the volume of the spring chamber (16) decreases and thereby generates a second air flow, which passes through the third flow connection (36) or the first flow connection (33).
26. A combined service brake cylinder and spring brake cylinder according to any one of claims 23 to 25, characterised in that: When the spring brake chamber (15) is decompressed, the volume of the spring chamber (16) increases and thereby generates a third air flow, which passes through the first flow connection (33) and the second flow connection (35).
27. A combined service brake cylinder and spring brake cylinder according to any one of the preceding claims, characterised in that A second actuating element (7) is arranged at a first end of the service brake piston rod (22), the second actuating element extending through an opening of the spring brake cylinder housing (11) or a second cover (13) of the spring brake cylinder housing (11), wherein the second actuating element (7) is arranged to actuate a brake caliper, and wherein the second end of the service brake piston rod (22) is connected to the service brake piston (18).
28. The combined service brake cylinder and spring brake cylinder according to claim 27, characterized in that: The second actuating element (7) is pivotally received in a recess (39) at the first end of the service brake piston rod (22).
29. A pneumatic or electro-pneumatic vehicle brake comprising at least one combined service brake cylinder and spring brake cylinder (1) according to any of the preceding claims.