Exhaust of pneumatic devices for housing electronic components
By introducing a liquid-impermeable but air-permeable exhaust element and throttle valve structure into the pneumatic device, the problems of corrosion and functional failure of the pneumatic device in the water environment are solved, and reliable protection and pressure stability of electronic components are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZF CV SYST GLOBAL GMBH
- Filing Date
- 2022-10-20
- Publication Date
- 2026-07-03
AI Technical Summary
Existing pneumatic devices are susceptible to corrosion and malfunction when operating in environments with external media, especially water, and existing sealing devices are ineffective in preventing liquid ingress.
Design a pneumatic device comprising a liquid-impermeable but air-permeable exhaust element, combined with a throttle valve and a balance chamber, to provide a permeable exhaust path, and to position the exhaust element upstream of the throttle valve to reduce back pressure peaks and protect the housing of electronic components from liquid intrusion.
It effectively prevents liquid from entering the pneumatic device, ensures the reliable operation of electronic components, reduces pressure peaks, protects sensors, provides environmental pressure reference, reduces noise and vibration, and simplifies the installation process.
Smart Images
Figure CN116135629B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a pneumatic device for a braking system, comprising: a housing for receiving electronic components, the housing being configured to be in fluid communication with the environment during operation of the pneumatic device; and an exhaust path having an exhaust port, the exhaust path being fluidly connected to the housing for receiving the electronic components so that the pneumatic device exhausts gas to the environment via the exhaust port. The invention also relates to a vehicle having such a pneumatic device and to a method for assembling the pneumatic device.
[0002] In particular, such pneumatic devices can be pneumatic braking systems for vehicles, especially commercial vehicles, or brake valves and / or relay valves for pneumatic braking systems. Background Technology
[0003] Typically, the above-described types of pneumatic devices are used in environments where various foreign media may be present. In particular, for example, during cleaning, operation in or after rain, flooding, or deliberate wading through water, pneumatic braking devices and their components (such as relay valves) may be exposed to water from their environment.
[0004] Pneumatic devices of the aforementioned types typically have a pneumatic connection to the environment in which they are installed, for example, to release excess pressure from the pressurized section of the device or to balance the pressure with the environment. However, such a pneumatic connection to the environment may allow foreign media located in the environment to enter the device. In particular, the entry of liquids (such as water) can impair the functionality of the device. For example, in the case of pneumatic braking systems, the entry of foreign media, especially water, can lead to corrosion, or, for example, to complete failure of the braking system due to water freezing. Therefore, measures must be taken to make unintentional entry of foreign media more difficult, or ideally, to prevent unintentional entry.
[0005] In the prior art, pneumatic devices with sealing mechanisms are known, designed to prevent the unintentional ingress of small amounts of splashed water or water below a certain level. Such pneumatic devices are disclosed in GB 2401330A, DE 102016011032A1, and DE2829290A1. Summary of the Invention
[0006] The purpose of this invention is to enable the safe operation of the pneumatic device of the type described at the beginning, even in environments with a large amount of external media, especially water.
[0007] In a first aspect, the problem is addressed by providing a pneumatic device for a braking system. Specifically, the problem is solved by having an exhaust element associated with an exhaust path, configured to provide a liquid-impermeable but gas-permeable barrier between the housing for receiving electronic components and the environment. A throttle valve is disposed in the exhaust path, and a balancing chamber is fluidly connected to the exhaust path and connected to the exhaust port via the throttle valve. The balancing chamber is configured to provide a balancing volume to reduce pressure peaks during operation of the pneumatic device. The exhaust element is positioned upstream of the throttle valve, and the throttle valve is configured to reduce back pressure peaks during operation of the pneumatic device by narrowing the flow cross-section of the exhaust path. In other words, the exhaust element prevents liquid ingress but allows gas permeability. In this context, liquid refers to a nearly incompressible fluid that conforms to the shape of its container but maintains a nearly constant volume independent of pressure, where the volume is determined if temperature and pressure are constant. Gas refers to a compressible fluid. It should be understood that the liquid and gaseous states described refer to the material states of the media that occur under environmental conditions during the operation of the pneumatic device.
[0008] The core benefits of the exhaust element during operation are twofold: firstly, the housing for receiving electronic components, which is fluidly connected to the exhaust path, is reliably protected against undesirable liquid ingress. Secondly, it allows gas to pass through the exhaust element, thereby enabling the exhaust of pneumatic devices, and the gas provides a reference pressure corresponding to ambient pressure, for example, for a pressure sensor arranged in the housing for receiving electronic components.
[0009] In the context of this invention, environmental conditions include pressures ranging from about 0 to 1 bar and temperatures above -40°C and less than or equal to 100°C. The internal or operating pressure within a pneumatic device is defined as the pressure difference compared to ambient pressure. Internal pressures can be as high as 13 bar, which occurs in non-pressure-sensitive portions of the pneumatic device.
[0010] Preferably, the pneumatic device has a pressure sensor fluidly connected to the exhaust path, the pressure sensor being configured to detect pressure within the pneumatic device. The sensor is preferably a pressure sensor housed within a housing for receiving electronic components.
[0011] In a preferred embodiment, the pneumatic device further includes a damping chamber that is fluidly connected to an exhaust port and the surrounding environment. Preferably, the flow path from the housing for receiving electronic components to the environment extends at least partially through the damping chamber to exhaust the pneumatic device. Such a damping chamber can be a silencer configured to reduce the overall noise of the pneumatic device during operation (e.g., during braking).
[0012] Preferably, the damping chamber is connected to the ambient fluid via a pressure passage. Therefore, the damping chamber at least partially dampens the sound and vibration that occur during exhaust.
[0013] The pneumatic device also includes a balancing chamber, which is fluidly connected to the exhaust path and configured to provide a balancing volume to reduce pressure spikes during pneumatic device operation. This invention takes into account the potential sensitivity of exhaust components to pressure spikes. By providing a balancing volume, these pressure spikes are significantly reduced.
[0014] The pneumatic device also includes a throttle valve disposed in the exhaust path, which is configured to narrow the flow cross-section in the exhaust path. This throttle valve may preferably cooperate with a balancing volume, such that the throttle valve connects the balancing chamber to the exhaust port. Because the throttle valve narrows the flow cross-section of the exhaust path, the pressure peak, and particularly the back pressure peak, decreases. Therefore, even sensitive exhaust elements are reliably protected when positioned upstream of the throttle valve.
[0015] Further preferably, the volume of the balancing chamber is adapted to the peak pressure during operation of the pneumatic device. This provides an increase in the total volume defined by the exhaust path and the balancing chamber, thereby significantly reducing the internal pressure of the pneumatic device. It should be understood that the additional volume provided by the balancing chamber is selected based on the peak pressure during operation, which may be as high as 13 bar, so that the pressurized air distributed in the exhaust path and the housing for receiving electronic components will not exceed a predefined internal pressure, preferably up to 2 bar.
[0016] Preferably, the flow cross-section of the throttle valve is adapted to the volume provided by the balancing chamber to avoid peak pressures during pneumatic operation. It should be understood that when the balancing chamber has an enlarged volume, the flow cross-section of the throttle valve is also enlarged compared to a pneumatic device with a smaller balancing chamber.
[0017] In a preferred embodiment, the exhaust element is arranged in the exhaust path upstream of the exhaust port. By arranging the exhaust element upstream of the exhaust port, the exhaust element is reliably protected from environmental influences, such as from chemicals or paints used during vehicle cleaning or painting.
[0018] In another preferred embodiment, the venting element is arranged in the vent adjacent to the damping chamber. Therefore, the venting path extending from the vent towards the housing for receiving electronic components is reliably protected by the venting element from water ingress. Furthermore, the venting element is arranged in the vent at a location where it is reliably protected from contamination or chemicals from the environment.
[0019] Preferably, the pneumatic device further includes a relay piston arranged in the exhaust path, to which the exhaust element is coupled. Therefore, the exhaust element and the relay piston can be pre-assembled to simplify the installation of the pneumatic device. This pre-assembly also ensures that the exhaust element is repeatedly and accurately placed within the pneumatic device.
[0020] More preferably, the exhaust element is connected to the relay piston via a snap-fit connection. This snap-fit connection provides a reliable attachment between the exhaust element and the relay piston, while also being cost-effective.
[0021] Preferably, the exhaust element is a membrane that is impermeable to liquids but permeable to air. A membrane is a space-saving exhaust element that can be easily integrated into a pneumatic device.
[0022] In a preferred embodiment, the pneumatic device is a pneumatic braking system, a brake valve assembly, or a relay valve. The braking system is typically at least partially mounted in the vehicle frame, which is exposed to wet weather conditions, splashing water, and high-pressure water jets during cleaning periods (e.g., before service operations) during its service life. Meanwhile, the housing for receiving electrical or electronic components typically contains a pressure sensor that needs to measure the braking pressure of such a braking system against ambient pressure. This requires the sensor to "breathe" in the environment. Water ingress is reliably prevented by having an exhaust element according to the invention.
[0023] More preferably, the relay piston is at least partially formed of a polymer. Therefore, the relay piston is lightweight. Furthermore, various known techniques for manufacturing the polymer portion enable a high degree of functional integration. For example, a relay piston with an integrated snap-fit element for connection to an exhaust element can be manufactured via injection molding through a so-called one-step process, which refers to a molding process comprising only one process step.
[0024] In a second aspect, the present invention relates to a braking system comprising a pneumatic device according to a first aspect of the invention. The preferred embodiments and advantages of the pneumatic device according to the first aspect are also preferred embodiments and advantages of the braking system according to the second aspect. Therefore, reference is made to the above description of the pneumatic device according to the first aspect of the invention.
[0025] Preferably, the pneumatic device of the braking system is the brake valve device of the braking system.
[0026] In a third aspect, the present invention relates to a commercial vehicle including a braking system according to the second aspect. It should be understood that the aspects and benefits of having a braking system according to the second aspect are also preferred embodiments and benefits of a commercial vehicle according to the third aspect of the invention. Therefore, reference is made to the above description of a pneumatic device according to the first aspect and a braking system having such a pneumatic device according to the second aspect of the invention.
[0027] According to a fourth aspect of the invention, the above-mentioned problem is solved by a method for assembling a pneumatic device, preferably a pneumatic device according to the first aspect, the method comprising the steps of: providing an exhaust element configured to provide a liquid-impermeable but air-permeable barrier; and arranging the exhaust element in the pneumatic device at a location associated with the exhaust path of the pneumatic device, such that a liquid-impermeable but air-permeable barrier is provided between the housing of the pneumatic device receiving electronic components and the environment.
[0028] It should be understood that methods of arranging exhaust elements in a pneumatic device according to the first aspect have aspects similar to or the same as the first aspect of the present invention. Therefore, reference is made to the above description of the pneumatic device according to the first aspect of the present invention. Attached Figure Description
[0029] To gain a more complete understanding of the invention, it will now be described in detail with reference to the accompanying drawings. The detailed description will illustrate and describe what is considered a preferred embodiment of the invention. It should be understood, of course, that various modifications and changes in form or detail can be readily made without departing from the spirit of the invention. Therefore, it is intended that the invention may not be limited to the exact forms and details shown and described herein, nor by any means limited to anything less than the entirety of the invention disclosed herein and claimed below. Furthermore, the features described in the specification, drawings, and claims that disclose the invention may be necessary for the invention to be considered individually or in combination. In particular, any reference numerals in the claims should not be construed as limiting the scope of the invention. The word “comprising” does not exclude other elements or steps. The word “a” or “an” does not exclude a plurality. The word “multiple” also includes the numeral 1, i.e., a single item, as well as other numerals such as 2, 3, 4, etc. In the drawings:
[0030] Figure 1 A schematic layout of a vehicle with a braking system is shown, the braking system including a pneumatic device according to the invention;
[0031] Figure 2 A cross-sectional view of a pneumatic device according to the prior art is shown;
[0032] Figure 3 A schematic layout of the pneumatic device according to the present invention is shown;
[0033] Figure 4 A cross-sectional view of the pneumatic device according to a first preferred embodiment is shown; and
[0034] Figure 5 A cross-sectional view of the pneumatic device according to a second preferred embodiment is shown. Detailed Implementation
[0035] like Figure 1 The vehicle 200 shown, particularly a commercial vehicle, includes a front axle 204 and a rear axle 206. To brake the front wheels 208.1, 208.2 of the front axle 204 and the rear wheels 210.1, 210.2 of the rear axle 206, the vehicle 200 may include a braking system 100 having a front axle braking circuit 102 for braking the front wheels 208.1, 208.2 and a rear axle braking circuit 104 for braking the rear wheels 210.1, 210.2. To brake the wheels 208.1, 208.2, 210.1, 210.2, the braking system 100 includes front axle brake actuators 106.1, 106.2 and rear axle brake actuators 108.1, 108.2. Front axle brake actuators 106.1 and 106.2 are connected to front axle brake modulator 110, while rear axle brake actuators 108.1 and 108.2 are connected to rear axle brake modulator 112. To provide compressed air at supply pressure, brake system 100 includes a compressed air supply unit 114. Of course, brake system 100 may include more than one air source.
[0036] To brake vehicle 200, braking pressure needs to be supplied to the front axle brake modulator 110 and the rear axle brake modulator 112. To provide braking pressure, braking system 100 includes a pneumatic device 1 (see...). Figure 3 and Figure 4 ).exist Figure 1 In the embodiment shown, the pneumatic device 1 is a brake valve device.
[0037] The brake valve device 1 includes a lower housing 2, which has a supply connection 7, a working connection 9, and an exhaust section 12. The exhaust section 12 includes an exhaust path 15 (see...). Figures 2 to 5 The supply connection 7 is connected to the compressed air supply unit 114 via the supply line 120.1 to receive pressurized air under supply pressure.
[0038] When the brake valve device 1 is actuated by a user or an electronic control unit such as that used for autonomous driving, the brake valve device 1 provides a braking pressure corresponding to the degree of actuation or a corresponding signal provided by the user. To allow actuation, the brake valve device 1 includes an actuating element 14, which in this embodiment is formed as a brake pedal. The brake valve device 1 is configured to adjust the braking pressure supplied to the working connection 9 according to the degree of actuation of the actuating element 14. If the brake pedal 14 is only slightly actuated, a low braking pressure is supplied to the working connection 9, while when the brake pedal 14 is fully actuated, a high braking pressure is supplied to the working connection 9.
[0039] Brake valve device 1 is connected to the front axle brake modulator 110 and the rear axle brake modulator 114 via connecting lines 116 and 118. In this embodiment, brake valve device 1 is configured as a single-circuit brake valve device 1, having only one working connection 9 for providing braking pressure. Both the front axle connecting line 116 connecting brake valve device 1 to the front axle brake modulator 110 and the rear axle connecting line 118 connecting brake valve device 1 to the rear axle brake modulator 112 are connected to the same working connection 9 of brake valve device 1. In other embodiments, brake valve device 1 may also be configured as a multi-circuit brake valve device 1, having multiple working connections 9 for providing the same and / or different braking pressures to brake circuits 102 and 104.
[0040] Brake modulators 110 and 112 receive the braking pressure provided by the brake valve assembly 1 and supply pressurized air to the corresponding brake actuators 106.1, 106.2, 108.1, and 108.2 at the same braking pressure but with a higher volume. Therefore, brake modulators 110 and 112 are also connected to the compressed air supply unit via supply lines 120.2 and 120.3. It should be noted that the front axle brake modulator 110 and / or the rear axle brake modulator 112 can also be configured to further modify the braking pressure. For example, the front axle brake modulator 110 may include an ABS module (not shown) for providing ABS functionality. Furthermore, brake actuators 106.1, 106.2, 108.1, and 108.2 can also be directly connected to the brake valve assembly 1.
[0041] To release the brakes on vehicle 200, brake pressure needs to be released from brake actuators 106.1, 106.2, 108.1, and 108.2. Brake valve assembly 1 is therefore configured to bleed brake actuators 106.1, 106.2, 108.1, and 108.2 by connecting the working connection 9 to the venting section 12. To vent pressurized air, air needs to be released into the environment through an opening. However, such an opening allows water to enter the braking system 100. Brake valve assemblies, particularly those with brake pedals, are typically located at a lower position on vehicle 200. The maximum wading depth of vehicle 200 is thus limited because water may enter the braking system 100 via the venting section 12 when vehicle 200 travels through water and the water level reaches the venting section. In conventional vehicles, the maximum available wading depth is sufficient, and standard brake valve assembly components can be used. However, if an increased wading depth is required, special measures are necessary. Therefore, wading versions of brake valve assemblies and / or brake valve assembly components are provided.
[0042] exist Figure 1 In this configuration, the brake valve assembly 1 has a housing 3 for receiving electronic components, which is connected to a damping chamber 11. The damping chamber 11 can be supplied by an exhaust muffler. To release the brakes on the vehicle 200, brake pressure is released from brake actuators 106.1, 106.2, 108.1, 108.2 via connecting lines 116, 118, the brake valve assembly 1, the housing 3 for receiving electronic components, the exhaust line 122, and the remote exhaust muffler 11.
[0043] Figure 2 The pneumatic device 1 shown is a brake valve device according to the prior art. The brake valve device 1 includes a lower housing 2, in which a housing 3 for receiving electronic components is housed. The housing 3 for receiving electronic components may have several electronic components, such as, for example, a sensor for detecting brake pressure, a solenoid, an electronic control unit (ECU), etc.
[0044] The housing 3 used to house electronic components must be fluidly connected to the environment 5 in order to provide a reference pressure for sensors, such as those detecting braking pressure.
[0045] The brake valve device 1 also has a damping chamber 11. In the illustrated embodiment, the damping chamber 11 is a muffler that includes a mounting bracket 21 that engages the lower housing 2 and holds the sound damping material 20 in place. The brake valve device 1 also has an exhaust path 15 that is fluidly connected to the housing 3 for receiving electronic components, fluidly connected to the inner chamber of the brake valve device 1 (e.g., the force balance chamber of the brake valve device 1), and fluidly connected to the environment 5 via a flow path 19 that extends at least partially through the muffler 11. Therefore, pressurized air flowing through the exhaust path 15 is directed directly into the sound damping material 20 by the flow path 19. This prevents excessive noise.
[0046] The housing 3 for housing electronic components is connected to the environment via a breathing channel 18, which may have a labyrinthine channel structure to reduce water ingress into the housing 3. While this labyrinthine channel 18 reduces water ingress, it does not provide a safety barrier between the environment and the housing 3 to prevent water entry. The housing 3 is configured to breathe towards the environment via the channel 18 to avoid excessive pressure differentials due to temperature increases. For example, temperature increases could damage sealing elements in pneumatic components, and minor leaks due to these pneumatic components could be released via the exhaust element 10.
[0047] like Figure 3 As shown in the schematic diagram, the pneumatic device 1 according to the invention provides a housing 3 for receiving electronic components, which is preferably received in a lower housing 2. The housing 3 for receiving electronic components is in fluid contact with the environment 5.
[0048] The pneumatic device 1 also has an exhaust section 12, which at least partially includes an exhaust path 15 configured to connect the housing 3 for receiving electronic components to the environment 5 via an exhaust port 17. Therefore, pressurized air can be discharged from the housing 3 for receiving electronic components in the flow direction F via the exhaust path 15 and the exhaust port 17.
[0049] The pneumatic device 1 also has an exhaust element 10 associated with an exhaust path 15, which is preferably arranged within the exhaust path 15 or adjacent to an exhaust port 17.
[0050] The exhaust element 10 is configured to provide a breathable but liquid-impermeable barrier between the environment 5 and the housing 3 for housing electronic components.
[0051] By arranging the exhaust element 10 at a location associated with the exhaust path 15, the exhaust element 10 is protected from the effects of dirt, chemicals and other interfering substances from the environment 5.
[0052] On the one hand, the breathable venting element 10 allows the housing 3 for receiving electronic components to vent along the flow direction F via the venting path 15 and the vent 17, and simultaneously allows breathable connection to the environment 5 for any sensors arranged within the housing 3 for receiving electronic components. On the other hand, the liquid-impermeable barrier provided by the venting element 10 reliably prevents water from entering the venting path 15 and reliably prevents water from entering the housing 3 for receiving electronic components, which could potentially damage the electronic components within the housing 3.
[0053] Figure 4 A pneumatic device 1 according to a first preferred embodiment is shown.
[0054] Pneumatic device 1 is Figure 4 The brake valve device in the illustrated embodiment.
[0055] The brake valve device 1 includes a lower housing 2 and a housing 3 for receiving electronic components, the housing 3 being coupled to the lower housing 2 and fluidly connected to the environment 5.
[0056] The brake valve device 1 has an exhaust portion 12, which includes an exhaust path 15 configured to provide a fluid connection between the housing 3 for receiving electronic components and the environment 5 via an exhaust port 17.
[0057] The brake valve device 1 also has a damping chamber 11 in which a flow path 19 is provided, the flow path 19 being configured to connect the exhaust path 15 to the environment 5 via the damping chamber 11.
[0058] In the illustrated embodiment, the damping chamber 11 is a silencer that includes a mounting bracket 21 that engages the lower housing 2 and holds the sound damping material 20 in place. The brake valve device 1 also has an exhaust path 15 that is fluidly connected to the housing 3 for receiving electronic components and fluidly connected to the environment via an exhaust port 17 and a flow path 19 that extends at least partially through the silencer 11. Therefore, pressurized air flowing through the exhaust path 15 is directly guided by the flow path 19 into the sound damping material 20. This prevents excessive noise.
[0059] The brake valve device 1 also includes an exhaust element 10, which is associated with an exhaust path 15. Figure 4 In the illustrated embodiment, the venting element is arranged adjacent to the vent 17, thereby providing a breathable but liquid-impermeable membrane between the housing 3 for receiving electronic components and the environment 5. Therefore, the venting element 10 can be easily accessed for maintenance purposes.
[0060] The brake valve assembly 1 also includes a relay piston 26 having a housing cover 25 disposed in the exhaust path 15 adjacent to the exhaust element 10. The relay housing cover 25 is received within the relay piston 26, which is connected to the lower housing 2.
[0061] The brake valve device 1 also has a sensor 27, which is fluidly connected to the housing 3 for receiving electronic components, and the sensor 27 is preferably arranged inside the housing 3 for receiving electronic components.
[0062] An exhaust passage 30 is disposed between at least one solenoid valve 29 and a damping chamber 11. The passage 30 is configured to exhaust the pre-controlled volume provided by the solenoid valve 29 to move the relay piston 26, wherein the brake valve device 1 has at least one solenoid valve 29 configured to selectively close the exhaust passage 30.
[0063] Figure 4 The embodiment of the brake valve device shown is preferably used in a brake system 100 that experiences low back pressure during operation (see...). Figure 1 ).
[0064] Figure 5 The pneumatic device 1 shown is a brake valve device and is related to... Figure 4 The difference in the brake valve device lies in the positioning of the exhaust element 10.
[0065] exist Figure 5 In the illustrated embodiment, the exhaust element 10 is arranged in the exhaust path 15 and upstream of the exhaust port 17. Therefore, the exhaust element 10 is protected from dust, dirt, and other undesirable substances entering the damping chamber 11 from the environment 5.
[0066] The brake valve device 1 also has a balance chamber 22, which is fluidly connected to the exhaust path 15 and is configured to provide a balance volume to prevent pressure peaks from acting on the exhaust element 10.
[0067] The exhaust path 15 also has a throttle valve 23, which is fluidly connected to the balance chamber 22 and fluidly connected to the flow path 19 via the exhaust port 17.
[0068] Throttling valve 23 is configured to narrow the flow path defined by exhaust path 15. Therefore, the pressure peak acting on exhaust element 10 is reduced due to... Figure 5 The narrowing of the flow cross-sectional area indicated by “23a” in the text is reduced.
[0069] The following describes the assembly method based on... Figure 4 and Figure 5A method for a pneumatic device 1. Such a method includes the steps of: providing an exhaust element 10 configured to provide a liquid-impermeable but air-permeable barrier; and arranging the exhaust element 10 in the pneumatic device 1 at a location associated with an exhaust path 15 and / or an exhaust port 17, such that a liquid-impermeable but air-permeable barrier is provided between a housing 3 for receiving electronic components and an environment 5, or correspondingly between the housing 3 for receiving electronic components and a damping chamber 11. Preferably, the method further includes the steps of providing a relay piston 26, pre-assembling the exhaust element 10 and the relay piston 26, and arranging the pre-assembled relay piston 26 together with the exhaust element 10 in the exhaust path 15, wherein the exhaust element 10 and the relay piston 26 are preferably connected by a snap-fit connection.
[0070] List of reference numerals
[0071] 1. Pneumatic device
[0072] 2 Lower shell
[0073] 3 Housings for electronic components
[0074] 5 Environment
[0075] 7 Supply Connection Section
[0076] 9 Working connection parts
[0077] 10 exhaust components
[0078] 11 Damping chamber, silencer
[0079] 12 exhaust section
[0080] 14 Actuating Elements
[0081] 15 Exhaust Path
[0082] 17 exhaust ports
[0083] 18 breathing channels
[0084] 19 Flow Path
[0085] 20 Sound Damping Materials
[0086] 21 supports
[0087] 22 balance chambers
[0088] 23 Throttle valve
[0089] Flow cross section of 23a throttle valve
[0090] 25 housing cover
[0091] 26 Relay Piston
[0092] 27 sensors
[0093] 29 Solenoid Valve
[0094] 30 exhaust channels
[0095] 100 braking system
[0096] 102 Front Axle Braking Circuit
[0097] 104 Rear Axle Braking Circuit
[0098] 106.1, 106.2 Front axle brake actuator
[0099] 108.1, 108.2 Rear axle brake actuator
[0100] 110 front axle brake modulator
[0101] 112 Rear Axle Brake Modulator
[0102] 114 Compressed Air Supply Department
[0103] 116 front axle connection cable
[0104] 118 rear axle connection cable
[0105] Supply lines 120.1, 120.2, and 102.3
[0106] 122 exhaust line
[0107] 11 Remote Exhaust Muffler
[0108] 200 vehicles
[0109] 204 front axle
[0110] 206 rear axle
[0111] 208.1, 208.2 Front wheels
[0112] 210.1, 210.2 Rear wheels
[0113] F indicates the direction of flow.
Claims
1. A pneumatic device (1) for a braking system (100), the pneumatic device (1) comprising: - Housing (3), the housing (3) is used to house electronic components and is configured to be in fluid communication with the environment during operation of the pneumatic device (1); - An exhaust path (15) having an exhaust port (17) and fluidly connected to the housing (3) to allow the pneumatic device (1) to exhaust gas into the environment (5) via the exhaust port (17); and - An exhaust element (10), which is associated with the exhaust path (15) and is configured to provide a liquid-impermeable but air-permeable barrier between the housing (3) and the environment (5). A throttle valve (23) is disposed in the exhaust path (15), and a balance chamber (22) is fluidly connected to the exhaust path (15) and connected to the exhaust port (17) via the throttle valve (23). The balance chamber (22) is configured to provide a balance volume to reduce pressure peaks during operation of the pneumatic device (1). The exhaust element (10) is arranged upstream of the throttle valve (23), and the throttle valve (23) is configured to reduce the back pressure peak during operation of the pneumatic device (1) by narrowing the flow cross section (23a) of the exhaust path (15).
2. The pneumatic device (1) according to claim 1 further includes a damping chamber (11), the damping chamber (11) being fluidly connected to the exhaust port (17) and the environment (5). wherein The flow path (19) from the housing (3) to the environment (5) extends at least partially through the damping chamber (11) to exhaust the pneumatic device (1).
3. The pneumatic device (1) according to claim 1 or 2, in, The volume of the balance chamber (22) is suitable for the peak pressure during operation of the pneumatic device (1).
4. The pneumatic device (1) according to claim 1 or 2, in, The flow cross section of the throttle valve (23) is adapted to the volume provided by the balance chamber (22) to avoid peak pressure during operation of the pneumatic device (1).
5. The pneumatic device (1) according to claim 1 or 2 further includes a relay piston (26) arranged in the exhaust path (15), wherein the exhaust element (10) is connected to the relay piston (26).
6. The pneumatic device (1) according to claim 5, in, The exhaust element (10) is connected to the relay piston (26) by a snap-fit connection.
7. The pneumatic device (1) according to claim 5, in, The relay piston (26) is at least partially formed of polymer.
8. The pneumatic device (1) according to claim 1 or 2, in, The exhaust element (10) is a membrane that is impermeable to liquid but permeable to air.
9. The pneumatic device (1) according to claim 1 or 2, in, The pneumatic device (1) is a pneumatic braking system (100), a relay valve, or a brake valve device.
10. A braking system (100) comprising a pneumatic device (1) according to any one of claims 1 to 9.
11. A commercial vehicle (200) comprising a braking system (100) according to claim 10.
12. A method for assembling a pneumatic device (1) according to any one of claims 1 to 9, the method comprising the steps of: - Provide an exhaust element (10) configured to provide a barrier that is impermeable to liquids but permeable to air. - The exhaust element (10) is arranged in the pneumatic device (1) at a position associated with the exhaust path (15) of the pneumatic device (1) so as to provide a liquid-impermeable but air-permeable barrier between the housing (3) of the pneumatic device (1) and the environment (5).
13. The method of claim 12, further comprising the step of: -Provide a relay piston (26), -Pre-assemble the exhaust element (10) and the relay piston (26), - The pre-assembled relay piston (26) and the exhaust element (10) are arranged in the exhaust path (15).