Hydrodynamic retarder

Abstract

The utility model relates to a hydrodynamic retarder, comprising a working medium tank consisting of a tank housing part and a tank cover, and a pressure control valve for selectively connecting a compressed air connection to the interior of the working medium tank or for releasing an exhaust gas channel from the interior of the working medium tank to an exhaust gas outlet, and the working medium tank can be exhausted through the waste gas outlet. According to the utility model, the waste gas outlet is formed by an exhaust device, and at least one exhaust characteristic, such as air velocity, air pressure and / or oil content, can be changed by means of the exhaust device.

Description

Technical Field

[0001] This utility model relates to a hydraulic retarder with an exhaust device, through which compressed air can be introduced into the environment. Background Technology

[0002] The construction of this hydraulic retarder is known in the prior art and includes a working medium tank and a working medium circuit connected thereto, in which a working chamber composed of a rotor and a stator is arranged. The retarder primarily operates in two states: non-braking operation and braking operation.

[0003] Under non-braking operation, the working medium, especially oil, is filled to a certain height in the working medium tank, thereby forming a working medium space and an air space in the working medium tank.

[0004] When the retarder switches to braking operation, the working medium tank is loaded with compressed air, thereby delivering the working medium into the working medium circuit. If the retarder switches back to non-braking operation, the working medium tank vents to the environment, thereby pumping the working medium back into the working medium tank through the pumping action between the rotor and stator. Therefore, the working medium tank is designed as a pressure tank, emptied or filled according to the air pressure.

[0005] Torque is transmitted from the blade rotor to the blade stator through a working medium. When the working chamber is filled, the rotor is slowed down, and thus the shafts designed to resist torsion with the rotor, especially the universal joint shafts or gearbox output shafts indirectly connected to the vehicle's wheels, are also slowed down.

[0006] The retarder's rotor and stator form an annular working chamber, which is connected to a working medium circuit containing a working medium tank via a channel system. The working chamber is vented through an exhaust system, allowing air to be discharged into the environment through the connection between the working chamber and the surrounding environment. The working medium tank can be connected to a compressed air interface via a compressed air regulator including multiple valves.

[0007] To switch the retarder to braking operation, compressed air must be loaded into the working medium tank via the compressed air regulator, also known as the MRCU, and the working chamber must be emptied. The air in the working chamber is then introduced into the surrounding environment through the side ventilation system.

[0008] When the retarder switches to non-braking operation, the working medium tank must be vented and the working chamber ventilated. The working chamber is ventilated to ambient air via a side ventilation system, as well as is well known from document DE10 2013 006 611A1. The working medium tank is discharged into the environment via an oil separator and MRCU. Therefore, the oil separator is arranged between the working medium tank and the environment. The connection to the environment can be disconnected via the MRCU and a pressure regulating valve, as is known, for example, from document DE 10 2019 134843 A1.

[0009] Therefore, a side ventilation system and an oil separator are known from document CN 105 697 749A, designed to prevent the working medium, especially oil, from entering the environment. Especially when switching to non-braking operation, oil foam forms, its volume being much larger than oil, and thus quickly fills the air space in the working medium tank with oil foam or oil, where oil entry into the environment is not permitted. To prevent this from happening, separate channel wiring is known between the working medium tank and the environment. Therefore, channel wiring with multiple separation chambers, each with a different structure, is known from document CN 105 697 602A.

[0010] For example, as known from document CN 105 697 601A, the oil separator channel is die-cast as an open channel in the tank cover. An intermediate element, in this case a seal, is needed between the tank cover and the tank support to close the channel or to allow for the channel's extension. Utility Model Content

[0011] The technical problem to be solved by this utility model is to further improve the air discharge when venting the working medium tank in the retarder.

[0012] The aforementioned technical problem is solved by a hydraulic retarder according to this utility model.

[0013] A hydraulic retarder is proposed, comprising a working medium tank consisting of a tank shell and a tank cover. The hydraulic retarder also includes a pressure regulating valve for selectively connecting a compressed air interface to the internal space of the working medium tank or for releasing an exhaust passage from the internal space of the working medium tank to an exhaust outlet through which the working medium tank can be vented.

[0014] According to the present invention, the exhaust outlet is constituted by an exhaust device, which can change at least one exhaust characteristic, such as air velocity, air pressure and / or oil content.

[0015] In one embodiment, the exhaust device may be a pipe segment, for example having the same or varying cross-sections.

[0016] To further alter the exhaust characteristics, baffles may be arranged in the cross-section, on which residual oil may be deposited.

[0017] In addition, the exhaust device may include a labyrinthine barrier and / or a filter element, wherein the filter element may be a flow control element, a sintered metal part, or a metal wire mesh. Attached Figure Description

[0018] The present invention will now be described in conjunction with the accompanying drawings. In the drawings:

[0019] Figure 1 A functional diagram of the retarder is shown.

[0020] Figure 2 Showing the exhaust device

[0021] Figure 3 An exhaust device with an oil filter is shown.

[0022] Figure 4 A cross-sectional view of an exhaust system with an oil filter is shown. Detailed Implementation

[0023] Figure 1 A functional schematic diagram of retarder 1 is shown, illustrating its main functions. The entire working medium loop through retarder 1 and the controller is also shown. Retarder 1 is essentially composed of its retarder housing, which is made up of multiple housing components 2, 3, 15, and 16. The stator housing 3 and the tank housing component can also be designed as a single piece. The rotor 6 and stator 7 are arranged between rotor housing 2 and stator housing 3. Oil, serving as the working medium 9, enters the working chamber 14 between rotor 6 and stator 7 through filling channel 12. The working medium 9 is returned to the working medium tank 4 via heat exchanger 11 and return channel 13.

[0024] As shown in the figure, the can consists of a can body 15, a can lid 16, and at least one partition element 17 installed between them. For additional functionality, further partition elements, not shown in the figure, may be provided within the can. The partition element 17 is designed such that it primarily seals the gap between the can body 15 and the can lid 16 relative to the surrounding environment. An additional function of the partition element 17 is to, together with the can body 15 and / or the can lid 16, form multiple sub-regions 18, 34, or channels 36 for specific functions.

[0025] The oil-fillable area of ​​the working medium tank 4 is the oil chamber 30, and the space above the oil surface is the air chamber 31. An oil separator 18 is disposed in the air chamber 31, and the oil separator has a flow passage 29. The outlet of the oil separator 18 is connected to the pressure regulating unit 19 and the compressed air supply device 32 via passages 20, 34, and 36. Through these passages 20, 34, and 36, the working medium tank can be loaded with compressed air for switching to braking operation and vented from the working medium tank after switching to non-braking operation.

[0026] Exhaust is achieved by switching corresponding valves within the compressed air regulator 19. During exhaust, the air, typically containing oil, flows into the oil separator 18 through the flow passage 29. The oil separator can be designed in various ways. The oil separator 18 may include labyrinthine baffles, baffles, and / or cyclone separators, which can be shaped to reduce the oil content in the air. The air can then directly enter the surrounding environment through passage 20, the compressed air regulator 19, and the exhaust passage 21, or, as shown, the exhaust gas can be again introduced into the working medium tank 4 through the exhaust chamber 23 or passage and from there enter the surrounding environment through the exhaust outlet 22.

[0027] The exhaust chamber 23 helps with sound insulation, and other measures can also be installed in the exhaust outlet 22.

[0028] Figure 1 Further details will not be elaborated here, as these details are already well known from existing technology.

[0029] Figure 2 The illustration shows a first embodiment of the exhaust device 35 according to the present invention, wherein the exhaust device is designed as a deflector pipe. Exhaust gas enters the exhaust chamber 23 through the pressure regulating valve 19 and the exhaust gas passage 21. The exhaust chamber 23 is a chamber within the working medium tank 4. The exhaust chamber 23 is a chamber not connected to the air chamber 31 of the working medium tank 4. The exhaust chamber 23 may be formed, for example, between the tank housing 15, the partition element 17, and the tank cover 15. Alternatively, the exhaust chamber 23 may also be formed between the partition element 17 and the tank housing 15 or the tank cover 15. In all three cases, the exhaust chamber 23 is connected between the exhaust gas passage 21 and the exhaust gas outlet 22.

[0030] Although exhaust gas 33 is guided through oil separator 18, oil may be sprayed out at the exhaust outlet. This oil is not allowed to come into contact with the components in the vehicle's transmission system, as these components may fail prematurely if an oil film is present.

[0031] Therefore, the exhaust device 35 has two main functions: firstly, it can guide the exhaust gas 33 to components where the oil film is harmless; secondly, the exhaust device 35 can be designed to promote the separation of oil within the exhaust device 35. This can be achieved through surface properties or coatings, but additional filters 37 and guide elements can also be provided.

[0032] Figure 3 and Figure 4 An alternative exhaust device 35 with an oil separator and filter 37 is shown. Figure 4 A cross-sectional view of an exhaust system 35 with an oil separator is shown, illustrating how exhaust gases are deflected multiple times and guided through filter 27 before reaching the surrounding environment. Through this special configuration, oil is collected in the exhaust system 35. Because the amount of oil is typically small, maintenance intervals are long.

[0033] This type of exhaust device 35 can also be integrated into the working medium tank 4 or the exhaust chamber 23. The filter material can be a flow control element, a sintered metal part, or a metal wire mesh.

[0034] List of reference numerals

[0035] 1. Retarder

[0036] 2 Rotor housing

[0037] 3. Stator housing

[0038] 4 Working medium tank

[0039] 5a and b bearings

[0040] 6 rotors

[0041] 7. Stator

[0042] 8 Rotor shaft

[0043] 9. Working medium

[0044] 10. Housing partition

[0045] 11 Heat Exchanger

[0046] 12 Infusion Channels

[0047] 13 Return Channel

[0048] 14 Working Chamber

[0049] 15 can stands

[0050] 16 can lids

[0051] 17. Separating element

[0052] 18 Oil separator

[0053] 19 Compressed Air Regulator

[0054] 20 Ventilation and exhaust channels

[0055] 21 Exhaust Gas Passage

[0056] 22 Exhaust Gas Outlet

[0057] 23 Exhaust Chamber

[0058] 24 Lubrication Channels

[0059] 25 Bypass

[0060] 26 Exhaust passage

[0061] 27 Controller

[0062] 28. Exhaust valve

[0063] 29 Entrances

[0064] 30 oil chambers

[0065] 31 Air Chamber

[0066] 32 Compressed air interface

[0067] 33 Exhaust gas

[0068] 35 Exhaust device

[0069] 36 Oil collection area

[0070] 37. Filter element.

Claims

1. A hydraulic retarder (1), comprising a working medium tank (4) consisting of a tank shell component (15) and a tank cover (16), the hydraulic retarder further comprising a pressure regulating valve (19) for selectively connecting a compressed air interface (32) to the internal space of the working medium tank (4) or for releasing an exhaust passage from the internal space of the working medium tank (4) to an exhaust outlet (22), through which the working medium tank (4) can be vented, characterized in that, The exhaust outlet (22) is composed of an exhaust device (35), by means of which at least one exhaust characteristic can be changed.

2. The hydraulic retarder (1) according to claim 1, characterized in that, The exhaust characteristics are air velocity, air pressure, and / or oil content.

3. The hydraulic retarder (1) according to claim 1, characterized in that, The exhaust device (35) is a pipe section.

4. The hydraulic retarder (1) according to claim 3, characterized in that, The pipe sections have the same or varying cross-sections.

5. The hydraulic retarder (1) according to claim 4, characterized in that, A partition is arranged in the cross-section.

6. The hydraulic retarder (1) according to claim 1, characterized in that, The exhaust device (35) includes a labyrinth-type barrier.

7. The hydraulic retarder (1) according to claim 1, characterized in that, The exhaust device (35) includes a filter element.

8. The hydraulic retarder (1) according to claim 7, characterized in that, The filter element is a flow control element, a sintered metal part, or a metal wire mesh.

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