Diaphragm device for spring brake actuator of pneumatic brake system of vehicle, in particular utility vehicle, spring brake actuator, pneumatic brake system and vehicle

Abstract

A diaphragm arrangement for a spring brake actuator of a pneumatic brake system of a vehicle, in particular a utility vehicle, a spring brake actuator, a pneumatic brake system and a vehicle are provided. There is provided a diaphragm arrangement (100) for a spring brake actuator (250) of a pneumatic brake system (210) of a vehicle (200a), wherein the diaphragm arrangement (100) is adapted to effect a mechanical interaction between a piston duct (255) and a push rod (260) of the spring brake actuator (250); and the diaphragm device (100) comprises an outer diaphragm member (110), an inner diaphragm member (120) and a piston plate (130), wherein the outer diaphragm member (110) is arranged at least partially outward from the inner diaphragm member (120) and from the piston plate (130); the piston plate (130) is adapted to deflect together with the push rod (260); the outer diaphragm member (110) is adapted to be mounted to a housing (251) of a spring brake actuator (250); the outer diaphragm member (110) comprises a central opening (111); the inner diaphragm member (120) and / or the piston plate (130) is arranged to cover the opening (111); and the outer diaphragm member (110), the inner diaphragm member (120), and the piston plate (130) are fixed to each other.

Description

Technical Field

[0001] This disclosure relates to a diaphragm device for a spring brake actuator in a pneumatic braking system for a vehicle, particularly a multi-purpose vehicle; wherein the diaphragm device is adapted to realize the mechanical interaction between the piston passage and the push rod of the spring brake actuator. This disclosure also relates to a spring brake actuator in a pneumatic braking system for a vehicle, particularly a multi-purpose vehicle, a pneumatic braking system for a vehicle, particularly a multi-purpose vehicle, and a vehicle, particularly a multi-purpose vehicle. Background Technology

[0002] Braking systems such as air brake systems are used to control the movement of vehicles, especially multi-purpose vehicles, in a safe and efficient manner. In particular, pneumatic brakes are used in multi-purpose vehicles such as trucks, trailers, and buses, which typically have a large gross vehicle weight. The inertial mass of these vehicles, combined with their potential speeds, necessitates braking devices that respond quickly with appropriate braking power. One system component of a pneumatic braking system is the spring brake actuator. The spring brake actuator typically provides the necessary force when braking the vehicle.

[0003] Typically, a spring brake actuator includes a service brake component and a parking brake component. In a diaphragm-type spring brake actuator, two pneumatic diaphragm brake actuators are usually arranged in series, including a pneumatic service brake actuator for applying normal operating braking and a spring brake actuator for applying parking or emergency braking. Both the service brake actuator and the spring brake actuator include a housing having an elastomeric diaphragm that divides the interior of the housing into two different fluid chambers.

[0004] A spring brake actuator includes a housing, a diaphragm within the housing to form a pressure chamber and a non-pressure chamber (also called a push rod chamber), a push rod, and a push rod plate (also called a piston plate) connected to the push rod and disposed within the push rod chamber. The spring brake actuator also includes a sheath, a return spring, and a spring seat. The pressure chamber is fluidly connected to a pressurized air source, and the non-pressure chamber houses the push rod, which is connectable to the braking device. The introduction and discharge of pressurized air into and from the pressure chamber cause the push rod to reciprocate along its axis in and out of the spring brake actuator to apply and release the operating brake.

[0005] EP 4 069 563 A1 discloses a spring brake actuator, particularly for parking or emergency spring brake actuators in commercial vehicles. The actuator includes: a cylinder housing including a cylinder housing base; a spring brake piston located within the cylinder housing for applying braking force; a spring guide attached to the spring brake piston; and a compression spring located between the cylinder housing base and the spring guide of the spring brake piston, the compression spring effectively pushing the spring brake piston away from the base. The spring guide includes a valve and a holding device for holding the valve, the holding device including a base and a clamping mechanism for clamping the device to the spring guide. The spring brake piston is held in a brake-released position by positive pressure within a pressure chamber. The spring brake piston is adapted to act on a diaphragm of the spring brake actuator, the diaphragm transmitting the applied force to a rod, which in turn transmits the applied force to a wheel brake.

[0006] In the prior art, the central region of the diaphragm is positioned between the parking piston passage and the piston plate. During emergency braking and / or parking braking, the parking piston passage pushes the piston plate via the diaphragm, and thus pushes the push rod. That is, the parking piston passage causes deflection of the diaphragm, which reciprocates to deflect the piston plate. The diaphragm and the parking piston passage are in mechanical contact with each other. Therefore, there is contact between the parking piston passage, which is typically made of metal, and the diaphragm, which may be made of rubber. Due to the elasticity of rubber, this contact may affect the output and / or performance of the equipment, and may cause wear on the diaphragm at the contact point. Summary of the Invention

[0007] The object of this invention is to provide a technical contribution and improve at least one aspect of the prior art. In particular, the object of this invention may be to provide a more robust interaction between the parking piston conduit and the pushrod of the spring brake actuator in a pneumatic braking system.

[0008] This objective is achieved by the subject matter of independent claim 1 and the remaining independent claims. The dependent claims relate to preferred embodiments.

[0009] According to one aspect of this disclosure, a diaphragm device is provided for a spring brake actuator in a pneumatic braking system for a vehicle, particularly a multi-purpose vehicle, wherein the diaphragm device is adapted to realize mechanical interaction between a piston passage and a push rod of the spring brake actuator; and the diaphragm device includes an outer diaphragm member, an inner diaphragm member, and a piston plate, wherein the outer diaphragm member is at least partially arranged outward from the inner diaphragm member and the piston plate; the piston plate is adapted to deflect together with the push rod; the outer diaphragm member is adapted to be mounted to a housing of the spring brake actuator; the outer diaphragm member includes a central opening; the inner diaphragm member and / or the piston plate are arranged to cover the opening; and the outer diaphragm member, the inner diaphragm member, and the piston plate are fixed to each other.

[0010] In other words, a diaphragm device comprising at least three different components can replace the diaphragm of the prior art. These three different components, namely, an outer diaphragm member, an inner diaphragm member, and a piston plate, are fixed to each other such that the outer diaphragm member allows for elastic deformation of the diaphragm device, and the inner diaphragm member can form a contact section for contact between the diaphragm device and the piston passage. For this purpose, the outer diaphragm member of this disclosure includes a central opening, instead of the contact section used for contacting the piston passage as in the prior art. According to this disclosure, the central opening is covered by the inner diaphragm member and / or the piston plate. Therefore, the piston passage can mechanically interact with the inner diaphragm member and / or the piston plate, but not with the outer diaphragm member.

[0011] This disclosure avoids and / or reduces damage to the central region of the diaphragm during actuation of the piston passage, because the piston passage does not push directly against the rubber diaphragm as known in the prior art. Instead, a contact can be formed between the inner diaphragm member and the parking piston passage, or between the parking piston passage and the piston plate, to transmit deflection from the piston passage through the piston plate to the push rod. This avoids wear on the rubber of the outer diaphragm member and enhances the performance of the spring brake actuator by preventing compression of the diaphragm in the contact section.

[0012] Alternatively, the outer diaphragm member is adapted to elastically deform under the mechanical actuation of the piston passage and / or pushrod. This allows the inner diaphragm member to be relatively stiff, since deformation of the diaphragm assembly can be performed by the outer diaphragm member. This provides robust and reliable contact between the inner diaphragm member and the piston passage.

[0013] Optionally, the outer diaphragm member includes an outer lip for hermetically mounting the outer diaphragm member to the housing. This allows prior art diaphragms to be replaced by diaphragm devices.

[0014] Optionally, the outer diaphragm member includes an inner lip for sealingly securing the outer diaphragm member to the inner diaphragm member and / or the piston plate. This allows the two pressure chambers to be sealed apart from each other via the diaphragm assembly.

[0015] Optionally, the piston plate includes a groove, and the inner lip protrudes into the groove. This enables the efficient manufacture of diaphragm devices and the achievement of a reliable seal between the outer diaphragm member and the inner diaphragm member and / or the piston plate.

[0016] Alternatively, the inner diaphragm component and the piston plate are secured to each other by press-fitting and / or stamping. This provides a cost-effective and reliable fixation of the inner diaphragm component and the piston plate. Press-fitting and / or stamping eliminates the need for through-holes and / or additional sealant for securing the inner diaphragm component and the piston plate to each other.

[0017] Optionally, the inner diaphragm assembly and the piston plate are secured to each other via a threaded connection. The threaded connection allows for efficient replacement of one or more components of the diaphragm unit. The threaded connection provides reliable fastening.

[0018] Optionally, the threaded connection includes at least one screw, wherein the screw is arranged recessed and / or at the same level relative to the inner diaphragm member. This allows the screw to not protrude from the inner diaphragm surface toward the piston passage. This achieves reliable mechanical contact and force transmission between the inner diaphragm member and the piston passage.

[0019] Optionally, the threaded connection includes a thread sealant. Thread seals (also known as thread locks) can further increase the reliability of the threaded connection.

[0020] Optionally, the inner diaphragm component and the piston plate are fixed to each other at circumferentially distributed connecting sections. Fixing the inner diaphragm component and the piston plate to each other at circumferentially distributed connecting sections allows for parallel orientation and / or alignment of the inner diaphragm component and the piston plate. This improves the precise manufacture of the diaphragm device.

[0021] Alternatively, the inner diaphragm component is a gasket. This is a cost-effective embodiment of the inner diaphragm component. The gasket can be made of metal (e.g., aluminum) and / or plastic.

[0022] Optionally, each of the outer diaphragm member, the inner diaphragm member, and the piston plate is annular and defined in the axial direction; and the outer diaphragm member is arranged, at least partially, in the overlapping section between the inner diaphragm member and the piston plate in the axial direction. This can enhance the sealing and / or securing reliability of the components of the diaphragm device.

[0023] According to one aspect of this disclosure, a spring brake actuator is provided for a pneumatic braking system of a vehicle, particularly a multi-purpose vehicle. The spring brake actuator includes a diaphragm device as described above. Optionally, the diaphragm device includes one or more features as described above as optional and / or preferred, thereby achieving the corresponding technical effects.

[0024] According to one aspect of this disclosure, a pneumatic braking system for a vehicle, particularly a multi-purpose vehicle, is provided. The pneumatic braking system includes a spring brake actuator as described above and / or a diaphragm device as described above. Optionally, the spring brake actuator and / or diaphragm device includes one or more features as described above as optional and / or preferred embodiments to achieve the corresponding technical effects.

[0025] According to one aspect of this disclosure, a vehicle, particularly a multi-purpose vehicle, is provided. The vehicle, particularly the multi-purpose vehicle, includes the pneumatic braking system, the spring brake actuator, and / or the diaphragm device as described above. Optionally, the pneumatic braking system, the spring brake actuator, and / or the diaphragm device include one or more features as described above as optional and / or preferred embodiments to achieve the corresponding technical effects. Attached Figure Description

[0026] Further advantages, technical features, and their technical effects are disclosed in the figures and their descriptions.

[0027] These figures illustrate the following preferred embodiments:

[0028] Figure 1 This is a schematic diagram of a vehicle, particularly a multi-purpose vehicle, according to embodiments of the present disclosure;

[0029] Figure 2 This is a side view of the components of a pneumatic braking system according to an embodiment of the present disclosure;

[0030] Figure 3 This is a cross-sectional view of a spring brake actuator;

[0031] Figure 4 This is a cross-sectional view of a diaphragm device according to an embodiment of the present disclosure; and

[0032] Figure 5 This is a cross-sectional view of a diaphragm device according to an embodiment of the present disclosure. Detailed Implementation

[0033] Figure 1A schematic diagram of a vehicle 200a, particularly a multi-purpose vehicle 200b, according to an embodiment of the present invention is shown. Hereinafter, vehicle 200a, particularly the multi-purpose vehicle 200b, is referred to as vehicle 200a, 200b. Vehicles 200a, 200b are land vehicles 200a, 200b. For example, vehicles 200a, 200b are trucks, buses, and / or tractor vehicles in a combination of vehicles.

[0034] Vehicles 200a and 200b include a pneumatic braking system 210. The pneumatic braking system 210 includes pneumatic and optional electrical components. For example, a braking request from the driver and / or operator of vehicles 200a and 200b can result in a braking signal that causes pneumatic and / or electro-pneumatic actuation of the pneumatic braking system 210. Pressurized air is provided and controlled to actuate the pneumatic braking system 210, thereby braking vehicles 200a and 200b.

[0035] The pneumatic braking system 250 includes a spring brake actuator 250. (Reference) Figures 2 to 5 This spring brake actuator 250 is further described. The spring brake actuator 250 includes a diaphragm device 100. (Reference) Figure 4 and Figure 5 Each of these further describes such a diaphragm device 100 according to an embodiment of the present disclosure.

[0036] Figure 2 A side view of components of a pneumatic braking system 210 according to an embodiment of the present disclosure is shown. The pneumatic braking system 210 is for vehicles 200a and 200b. Reference Figure 1 This describes vehicles 200a and 200b and their pneumatic braking system 210. (Reference) Figure 1 describe Figure 2 .

[0037] The pneumatic braking system 210 includes a pneumatic brake 220 and a spring brake actuator 250. The pneumatic brake 220 is a disc brake. The pneumatic brake 220 includes brake pads (not shown) and a brake disc (not shown). The pneumatic brake 220 is adapted to be actuated to bring the brake pads and brake disc into contact to generate braking torque. The spring brake actuator 250 is adapted to actuate and / or release the pneumatic brake 220.

[0038] refer to Figures 3 to 5 The spring brake actuator 250 is further described.

[0039] Figure 3 A cross-sectional view of the spring brake actuator 250 is shown. Figure 3The spring brake actuator 250 is a prior art spring brake actuator 250 having a diaphragm 99. The remaining components of the spring brake actuator 250 can be used with the diaphragm device 100, as described below. Figure 4 and Figure 5 As stated above.

[0040] The spring brake actuator 250 includes a housing 251, a diaphragm 99, and a piston passage 255. The housing 251 provides a pressure chamber 252 and a second chamber 253. The diaphragm 99 is arranged within the housing 251 to separate the pressure chamber 252 from the second chamber 253.

[0041] A diaphragm 99 is disposed between a piston conduit 255 and a piston plate 130. The piston conduit 255 is disposed within a pressure chamber 252 and adapted to deflect toward a second chamber 253, i.e., to translate. The diaphragm 99 is in mechanical contact with and / or can form mechanical contact with the piston conduit 255 and the piston plate 130, particularly during the application of emergency or parking brakes. The piston conduit 255 then pushes the piston plate 130 through the diaphragm 99. In this case, the metal piston conduit 255 and the rubber diaphragm 99 are in contact with each other. The spring brake actuator 250 includes a push rod 260 which can be integrally formed with and / or attached to the piston plate 130. Therefore, deflection of the piston plate 130 causes deflection of the push rod 260. Deflection of the push rod 260 can actuate the pneumatic brake 220.

[0042] According to the reference Figure 4 and Figure 5 The diaphragm 99 described in the embodiments of the present invention can be derived from a reference. Figure 4 and Figure 5 The diaphragm device 100 described is used instead.

[0043] Figure 4 A cross-sectional view of a diaphragm device 100 according to an embodiment of the present disclosure is shown. The diaphragm device 100 is a diaphragm device 100 for a spring brake actuator 250. Reference Figure 3 This describes a spring brake actuator 250. (Reference) Figures 1 to 3 describe Figure 4 .

[0044] The diaphragm device 100 includes three components: an outer diaphragm member 110, an inner diaphragm member 120, and a piston plate 130. Each of the outer diaphragm member 110, the inner diaphragm member 120, and the piston plate 130 is annular and defined in the axial direction A.

[0045] The diaphragm device 100 is adapted to realize the mechanical interaction between the piston conduit 255 of the spring brake actuator 250 and the push rod 260. The push rod 260 and the piston plate 130 are formed as one piece. The piston conduit 255 can transmit force to the inner diaphragm member 120 and / or cause displacement of the inner diaphragm member 120, which in turn can transmit force to the piston plate 130 and the push rod 260 and / or cause displacement of the piston plate 130 and the push rod 260. Therefore, the piston plate 130 is adapted to deflect together with the push rod 260.

[0046] The outer diaphragm member 110 is adapted to be mounted to the housing 251 of the spring brake actuator 250. Therefore, the outer diaphragm member 110 includes a shape and / or size for mounting the outer diaphragm member 110 into and / or onto the housing, to separate the different chambers of the spring brake actuator 250 from each other. The outer diaphragm member 110 includes an outer lip 112 for hermetically mounting the outer diaphragm member 110 to the housing 251. The outer lip 112 is disposed at the outer circumference of the outer diaphragm member 110.

[0047] The outer diaphragm member 110 includes a central opening 111. The central opening 111 is centrally located relative to the axial direction A. The central opening 111 extends radially outward from the axis defining the axial direction A toward an inner lip 113. The inner lip 113 is located at the inner circumference of the outer diaphragm member 110.

[0048] The outer diaphragm member 110 is arranged at least partially outward from the inner diaphragm member 120 and from the piston plate 130. The inner diaphragm member 120 and the piston plate 130 are arranged to cover the opening 111. Specifically, the piston plate 130 completely covers the opening 111, and the inner diaphragm member 120 partially covers the opening 111, that is, the outer section of the opening 111 is covered by the inner diaphragm member 120.

[0049] The inner diaphragm member 120 is a gasket 122. The gasket 122 is arranged to mechanically interact with the piston passage 255. The gasket 122 is a disc-shaped plate with a central opening. The gasket 122 is made of metal or plastic.

[0050] The outer diaphragm member 110 is adapted to elastically deform under the mechanical actuation of the piston passage 255 and / or push rod 260. The outer diaphragm member 110 is made of rubber. The outer diaphragm member 110 includes elasticity capable of deforming the outer diaphragm member 110.

[0051] The outer diaphragm member 110, the inner diaphragm member 120, and the piston plate 130 are fixed to each other. The outer diaphragm member 110 includes an inner lip 113. The inner lip 113 is adapted to sealably fix the outer diaphragm member 110, the inner diaphragm member 120, and the piston plate 130. To receive the inner lip 113, the piston plate 130 includes a groove 131. The inner lip 113 protrudes into the groove 131. The outer diaphragm member 110 is arranged at least partially in the overlapping section 114 between the inner diaphragm member 120 and the piston plate 130 in the axial direction A. That is, the outer diaphragm member 110, the inner diaphragm member 120, and the piston plate 130 are arranged in a sandwich structure, wherein the outer diaphragm member 110 is arranged between the inner diaphragm member 120 and the piston plate 130.

[0052] The inner diaphragm member 120 and the piston plate 130 are fixed to each other at circumferentially distributed connecting sections 121. The connecting sections 121 are evenly distributed circumferentially. Figure 4 In this embodiment, the inner diaphragm member 120 and the piston plate 130 are fixed to each other at six circumferentially distributed connecting segments 121. In another embodiment (not shown), any other number of connecting segments 121, greater than two, may be used.

[0053] The inner diaphragm member 120 and the piston plate 130 are fixed to each other by a press-fit and / or stamped connection 140. The sandwich structure described above is fixed by the press-fit and / or stamped connection. The inner diaphragm member 120 and the piston plate 130 are pressed toward each other, and the outer diaphragm member 110 is confined within the inner diaphragm member 120 and the piston plate 130.

[0054] The diaphragm assembly 100 provides a tight connection between the outer diaphragm member 110 and the piston plate 130 for use with the spring brake actuator 250. The diaphragm assembly 100 includes the outer diaphragm member 110, the piston plate 130, and an inner diaphragm member 120 as an additional element, which serves as a perforated plate, i.e., a washer or a solid plate, connecting the two components. The inner edge of the outer diaphragm member 110 provides an inner lip 113 located between the piston plate 130 with a dedicated groove 131 and the inner diaphragm member 120.

[0055] Figure 5 A cross-sectional view of a diaphragm device 100 according to an embodiment of the present disclosure is shown. Figure 5 The diaphragm device 100 is Figure 4 An alternative to the diaphragm device 100. (See reference) Figure 4 describe Figure 5 Describe the differences.

[0056] exist Figure 5In this configuration, the inner diaphragm component 120 and the piston plate 130 are fixed to each other via a threaded connection 141. The threaded connection 141 includes a plurality of screws 142. The screws 142 are evenly distributed along the circumference. Figure 5 In this embodiment, the inner diaphragm member 120 and the piston plate 130 are secured to each other by six circumferentially distributed screws 142. In another embodiment (not shown), any other number of screws 142 greater than two may be used.

[0057] Each of the screws 142 is arranged to be recessed and / or at the same level relative to the inner diaphragm member 120. Therefore, the inner diaphragm member 120 includes through-holes into which one of the screws 142 is inserted. The through-holes may include a cylindrical geometry and / or a truncated conical segment for receiving the head of one of the screws 142.

[0058] The threaded connection 141 includes a thread sealant 143. The thread sealant 143 is disposed between the screw 142 and the inner diaphragm member 120. To provide a tight connection between the inner diaphragm member 120 and the piston plate 130, the thread sealant 143 is applied to the screw 142 or other threaded element. The screw head should be at the same level as the inner diaphragm member 120, or may be concealed in one of the holes.

[0059] In another embodiment (not shown), the inner diaphragm member 120 and the piston plate 130 are connected by means of... Figure 5 The threaded connection 141 shown and the threaded connection through, as shown Figure 4 The press-fit and / or stamped connection 140 shown is fixed to each other. That is, those skilled in the art can assemble them. Figure 4 and Figure 5 Examples of implementations.

[0060] List of reference numerals (part of the instruction manual)

[0061] 99 diaphragm

[0062] 100 diaphragm device

[0063] 110 outer diaphragm component

[0064] 111 Central opening

[0065] 112 outer lip

[0066] 113 Inner Lip

[0067] 120 inner diaphragm component

[0068] 121 Connecting Section

[0069] 122 Washer

[0070] 123 Washer Opening

[0071] 130 Piston Plate

[0072] 131 groove

[0073] 140 Press-fit and / or stamped connection

[0074] 141 Threaded Connection

[0075] 142 screws

[0076] 143 thread sealant

[0077] 200a vehicle

[0078] 200b multipurpose vehicle

[0079] 210 Pneumatic Braking System

[0080] 220 pneumatic brake

[0081] 250 spring brake actuator

[0082] 251 housing

[0083] 252 pressure chambers

[0084] Room 253

[0085] 255 piston pipe

[0086] 260 putter

[0087] A is the axial direction.

Claims

1. A diaphragm device (100) for a spring brake actuator (250) in a pneumatic braking system (210) for a vehicle (200a), particularly a multi-purpose vehicle (200b); wherein The diaphragm device (100) is adapted to realize the mechanical interaction between the piston passage (255) and the push rod (260) of the spring brake actuator (250); and The diaphragm device (100) includes an outer diaphragm member (110), an inner diaphragm member (120), and a piston plate (130), wherein The outer diaphragm member (110) is arranged at least partially outward from the inner diaphragm member (120) and from the piston plate (130); The piston plate (130) is adapted to deflect together with the push rod (260); The outer diaphragm member (110) is adapted to be mounted to the housing (251) of the spring brake actuator (250). The outer diaphragm member (110) includes a central opening (111). The inner diaphragm member (120) and / or the piston plate (130) are arranged to cover the opening (111); and The outer diaphragm member (110), the inner diaphragm member (120), and the piston plate (130) are fixed to each other.

2. The diaphragm device (100) according to claim 1, wherein, The outer diaphragm member (110) is adapted to elastically deform under the mechanical actuation of the piston conduit (255) and / or the push rod (260).

3. The diaphragm device (100) according to claim 1 or 2, wherein, The outer diaphragm member (110) includes an outer lip (112) for hermetically mounting the outer diaphragm member (110) to the housing (251).

4. The diaphragm device (100) according to any one of the preceding claims, wherein, The outer diaphragm member (110) includes an inner lip (113) for sealingly securing the outer diaphragm member (110), the inner diaphragm member (120), and / or the piston plate (130).

5. The diaphragm device (100) according to claim 4, wherein, The piston plate (130) includes a groove (131), and the inner lip (113) protrudes into the groove (131).

6. The diaphragm device (100) according to any one of the preceding claims, wherein, The inner diaphragm member (120) and the piston plate (130) are fixed to each other by pressing and / or stamping connection (140).

7. The diaphragm device (100) according to any one of the preceding claims, wherein, The inner diaphragm member (120) and the piston plate (130) are fixed to each other by a threaded connection (141).

8. The diaphragm device (100) according to claim 7, wherein, The threaded connection (141) includes at least one screw (142). The screw (142) is arranged to be recessed and / or at the same level relative to the inner diaphragm member (120).

9. The diaphragm device (100) according to claim 7 or 8, wherein, The threaded connection (141) includes thread sealant (143).

10. The diaphragm device (100) according to any one of the preceding claims, wherein, The inner diaphragm member (120) and the piston plate (130) are fixed to each other at the circumferentially distributed connecting section (121).

11. The diaphragm device (100) according to any one of the preceding claims, wherein, The inner diaphragm component (120) is a gasket (122).

12. The diaphragm device (100) according to any one of the preceding claims, wherein, Each of the outer diaphragm member (110), the inner diaphragm member (120), and the piston plate (130) is annular and defined in the axial direction (A); and The outer diaphragm member (110) is arranged at least partially in the overlapping section (114) between the inner diaphragm member (120) and the piston plate (130) in the axial direction (A).

13. A spring brake actuator (250) for a pneumatic braking system (210) for a vehicle (200a), particularly a multi-purpose vehicle (200b), the spring brake actuator comprising a diaphragm device (100) according to any one of the preceding claims.

14. A pneumatic braking system (210) for a vehicle (200a), particularly a multi-purpose vehicle (200b), wherein, The pneumatic braking system (210) includes the spring brake actuator (250) according to claim 13 and / or the diaphragm device (100) according to any one of claims 1 to 12.

15. A vehicle (200a), particularly a multi-purpose vehicle (200b), wherein, The vehicle (200a), particularly the multi-purpose vehicle (200b), includes the pneumatic braking system (210) according to claim 14, the spring brake actuator (250) according to claim 13, and / or the diaphragm device (100) according to any one of claims 1 to 12.

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