CN111746480A - Device for closing a working chamber bleed air passage of a retarder - Google Patents
Device for closing a working chamber bleed air passage of a retarder Download PDFInfo
- Publication number
- CN111746480A CN111746480A CN202010235314.5A CN202010235314A CN111746480A CN 111746480 A CN111746480 A CN 111746480A CN 202010235314 A CN202010235314 A CN 202010235314A CN 111746480 A CN111746480 A CN 111746480A
- Authority
- CN
- China
- Prior art keywords
- preparation
- working medium
- set forth
- float
- foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006260 foam Substances 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 12
- 238000007872 degassing Methods 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
- F16D57/04—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders with blades causing a directed flow, e.g. Föttinger type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
- B60T1/08—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium
- B60T1/087—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium in hydrodynamic, i.e. non-positive displacement, retarders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
- B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
Abstract
The invention relates to a device for closing a bleed air passage of a working chamber of a retarder. For an apparatus for closing an air bleed channel (15) for connecting a working chamber (9) which is formed by a rotor (3) and a stator (4) and can be filled with a working medium in a retarder (1) with the surroundings, the apparatus comprises a non-return valve (16) which is provided with a float body (17) and with a float cavity (18) with a sealing plane (19), wherein the float body (17) is designed such that: so that when the working medium and/or the working medium foam is conveyed into the float chamber (18) via the degassing channel (15), the float body is moved from the open position into the closed position towards the sealing plane (19). According to the invention, means are provided between the working chamber (9) and the sealing plane (19) as seen in the flow direction (A), by means of which the density of the working medium foam can be varied.
Description
Technical Field
The invention relates to an arrangement for closing a bleed air channel in a retarder, wherein the bleed air channel connects a working chamber with the surroundings.
Background
Such a working chamber is for example a working chamber formed between the rotor and the stator of the retarder. However, it is also conceivable that it is any chamber that can be filled with oil, for example the oil tank of the retarder.
When switching the retarder to the braking mode, compressed air is led into the oil tank, whereby oil is pressed from the oil tank into the working chamber of the retarder. The contained air can escape from the working chamber via a passage whose one opening terminates in the center of the working chamber. Although a major proportion of the oil is forced into the circulating flow of the annular configuration in the cross section of the working chamber by the rotation of the rotor, this results in the formation of oil bubbles in the center of the working chamber, which oil bubbles are conveyed out of the working chamber via the bleed air channel. The oil foam has a lower density than the liquid oil, so that the function of the device for closing the gas discharge channel (in particular the check valve with the float body) is no longer functional and results in the oil foam escaping from the gas discharge channel into the surroundings.
When switching to the non-braking mode, oil is carried or pumped back out of the working chamber to the oil tank. This also results in foam formation which is extruded from the pressure tank.
In particular, the occurrence of large foam formations can lead to a malfunction of the check valve, since the float of the check valve cannot acquire sufficient buoyancy, so that oil foam can escape into the surroundings.
Oil foam will occur when the retarder oil is contaminated, for example, by water, wrong/bad oil or undesired air transport (non-tightness).
DE 102013006611 a1 discloses a ventilation device with a non-return valve, which is connected to the center of the working chamber via a channel. An additional volume is proposed here, which is preceded by a non-return valve. By increasing the volume, the flow rate is reduced, which leads to an improved separation of the air fraction and the working medium fraction. Additionally, an insert may be provided in the channel, which insert protrudes into the channel and provides an increased surface, thereby improving the separation.
DE 102013207004 a1 discloses a ventilation device for a fuel tank. To separate the oil from the air, a labyrinth is preceded by a valve.
Another solution is proposed in DE 102012002039 a 1. The air from the oil tank is guided through the centrifugal separator.
Disclosure of Invention
The object of the invention is to provide a device for closing an air discharge duct, which has an improved function, so that no oil enters the surroundings.
According to the invention, this object is achieved by a device according to claim 1. Further advantageous embodiments and preferred solutions are described in the dependent claims.
According to the invention, a device for closing the bleed air channel is proposed, which is arranged to connect a working chamber, which can be filled with a working medium and which is formed by the rotor and the stator, in the retarder to the surroundings. The device comprises a non-return valve which is provided with a float body and with a float chamber with a sealing plane, wherein the float body is designed such that it moves from an open position into a closed position towards the sealing plane when the working medium and/or the working medium foam is conveyed into the float chamber via the degassing channel.
In order to improve the functionality, it is proposed according to the invention that, viewed in the flow direction, a means is provided between the working chamber and the sealing plane, by means of which the density of the working medium foam can be varied.
The change of the foam of the working medium is achieved in that the air content of the foam is reduced before the foam reaches the sealing plane, i.e. the foam structure is changed and/or destroyed. The air that has become free can then escape via the still open non-return valve. Furthermore, once the working medium and/or the treated foam (having a higher density) have accumulated in the float cavity and reached a definable level, at this point the float body will move or float into a closed position such that the check valve is safely closed.
The check valve according to the invention, in particular the float body, is therefore designed such that: the float body is moved into the closed position when the working medium foam in the float chamber and the density of the working medium foam reach a definable level.
The mechanism may be disposed in the deflation channel before and/or within the float cavity in various embodiments. Wherein, in the sense of the invention, the float chamber forms a partial section of the deflation channel.
These means may be for example wire mesh or screen elements. The wire mesh may be made of a wire braid having a mesh width of 4mm to 10 mm. In this case, a mesh width of, in particular, 6mm to 8mm is preferred for the retarder oil.
In a preferred embodiment, the wire mesh may be made by deformation of a multi-layered wire braid, wherein the individual wires of the wire braid are deformed to form the filter structure. A filter structure is to be understood in the sense of the present invention as a structure in which a regular structure of a wire braid is modified into an irregular structure having an increased flow resistance for fluids such as oil and air oil mixtures.
In one embodiment, the wire mesh may have a passable area between 0.5% and 40%. Further, the wire mesh may be composed of a stainless steel braid.
In addition, it can be provided in one embodiment that the means comprise a movable part, by means of which the foam structure of the working medium can be broken up or changed.
To support foam collapse, these mechanisms may also include nozzles by which the working medium can be injected into the bleed channels.
Furthermore, it is advantageous if an oil separator is provided between the check valve and the surroundings.
The check valve and/or the mechanism may be constituted by individual components that have to be assembled or produced by a so-called additive manufacturing method, so that they form a unit.
Drawings
The invention is explained in more detail below with the aid of the figures. Wherein:
FIG. 1 shows a schematic view of an apparatus for closing an air bleed passage;
FIG. 2 illustrates an embodiment of an apparatus;
FIG. 3 shows a wire mesh;
fig. 4 shows a hydraulic circuit with an associated working medium circuit.
Detailed Description
Fig. 1 shows a schematic view of a device 2 for closing an air bleeding channel. The closed device 2 shown here comprises an oil separator 21 with an exhaust outlet 22, a check valve 16 and a wire mesh 20.
The closure device 2 comprises a non-return valve 16 which closes only on the basis of its structural design when the buoyancy of the float body 17 is sufficiently great for the float body to move into the closed position towards the sealing plane 19.
Fig. 2 shows a possible embodiment of a closure device 2, which essentially corresponds to the structure of the schematic diagram shown in fig. 1.
If for the braking mode the working medium, in particular retarder oil, is moved into the working chamber 9 of the retarder, the air comprised in the retarder working chamber 9 must be let out. Depending on the state of the oil, however, foam formation takes place in the working chamber 9 and the foam is pressed out of the working chamber via the venting channel 15, the opening of which is located in the center of the working chamber. The closing means 2 now has the task of preventing oil from entering the surroundings. The precondition for this is that the density of the working medium and/or the working medium foam transported into the float chamber 18 is so high that the float body 17 in the float chamber 18 is moved from the open position into the closed position against the sealing plane 19. According to the invention, the density of the oil foam is changed by passing it through the wire mesh 20, i.e. breaking the foam or at least breaking the foam so that large foam bubbles become small foam bubbles.
For further safety, an oil separator 21 is also provided between the check valve 16 and the surroundings.
After switching the retarder into the non-braking mode, a negative pressure arises in the working chamber, which negative pressure causes the float body 17 to move into the open position in the float chamber and ambient air to enter the working chamber 9 through the bleed passage 15 counter to the flow direction a.
In a further embodiment, not shown, in order to break up the foam and/or reduce the bubbles, a nozzle can also or additionally be provided in the air bleed channel 15, via which nozzle oil is injected into the channel, through which nozzle the bubbles are broken. Alternatively or additionally, movable components that move through the foam are also conceivable.
An embodiment of a wire mesh 20 is shown in fig. 3. The wire mesh consists of multiple layers of wire braids which are stacked on top of each other and modified to form wire mesh 20, thereby forming the filter structure presented. In order to achieve a good foam breaking effect, the wire braid should have a wire thickness of 0.01mm to 1mm, wherein the mesh width may be 4mm to 10 mm.
The number of layers of wire braid and the degree of modification to the wire mesh with filtering effect can be matched to the retarder oil used, wherein a passable area between 0.5% and 10% will lead to the best results.
Fig. 4 schematically shows a hydraulic circuit with an associated working medium circuit. The retarder 1 has a bladed rotor 3 and a bladed stator 4, wherein the bladed rotor 3 is driven by a drive train to be braked, for example a motor vehicle drive train, via a drive shaft 5. The rotor 3 and the stator 4 are accommodated in a retarder housing 6, which comprises an interface for an external working medium circuit 2, in the present case an interface for an inflow 7, which is in a conducting connection with the working chamber 9 via a working medium inlet 8, and a first return 10 and a second return 11, which are in a conducting working medium connection with the working chamber 9 via a first working medium outlet 12 and a second working medium outlet 13.
The working medium outlets 12, 13, the inflow 7 and the idle channel 24 connected to the idle pump 23 are connected to a tank, not shown here, which contains a heat exchanger.
List of reference numerals
1 retarder
2 sealing device
3 rotor
4 stator
5 drive shaft
6 retarder shell
7 inflow part
8 working medium inlet
9 working chamber
10 first return part
11 second reflux part
12 first working medium outlet
13 second working medium outlet
14 center
15 air discharge channel
16 check valve
17 float body
18 float cavity
19 sealing plane
20 wire mesh
21 oil separator
22 exhaust outlet
23 Pump
24 idle running channel
Direction of flow A
Claims (12)
1. Device for closing an air bleed channel (15) for connecting a working chamber (9) which is formed by a rotor (3) and a stator (4) and can be filled with a working medium in a retarder (1) to the surroundings, comprising a non-return valve (16) which is provided with a float body (17) and with a float cavity (18) with a sealing plane (19), wherein the float body (17) is designed such that: such that when the working medium and/or the working medium foam is conveyed into the float chamber (18) via the gas discharge channel (15), the float body is moved from an open position into a closed position towards the sealing plane (19),
it is characterized in that the preparation method is characterized in that,
between the working chamber (9) and the sealing plane (19), viewed in the flow direction (A), means (20) are provided by means of which the density of the working medium foam can be varied.
2. The apparatus as set forth in claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
the float body (17) is designed such that: the float body (17) is moved into the closed position when the working medium foam in the float chamber (18) and the density of the working medium foam reach a definable level.
3. The apparatus as set forth in claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
the means (20) is arranged in the deflation channel before and/or inside the float cavity.
4. The apparatus as set forth in claim 3, wherein,
it is characterized in that the preparation method is characterized in that,
the means (20) is a wire mesh or a screen element.
5. The apparatus as set forth in claim 4, wherein,
it is characterized in that the preparation method is characterized in that,
the wire mesh is made of a wire braid having a wire thickness of 0.01 to 1mm and a mesh width of 4 to 10 mm.
6. The apparatus as set forth in claim 5, wherein,
it is characterized in that the preparation method is characterized in that,
the wire mesh is produced by deformation of a multi-layered wire braid, wherein the individual wires of the wire braid are deformed to form a filter structure.
7. The apparatus as set forth in claim 4, wherein,
it is characterized in that the preparation method is characterized in that,
the wire mesh has a passable area of between 0.5% and 40%.
8. The apparatus as set forth in claim 5, wherein,
it is characterized in that the preparation method is characterized in that,
the wire mesh is constructed of a stainless steel braid.
9. The apparatus as set forth in claim 2, wherein,
it is characterized in that the preparation method is characterized in that,
the mechanism comprises a movable part by means of which the foam structure of the working medium can be broken up or changed.
10. The apparatus as set forth in claim 2, wherein,
it is characterized in that the preparation method is characterized in that,
the mechanism comprises a nozzle by means of which a working medium can be injected into the bleed air channel (15).
11. The apparatus as set forth in claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
an oil separator (21) is provided between the check valve (16) and the surroundings.
12. The apparatus of any one of claims 1 to 10,
it is characterized in that the preparation method is characterized in that,
the non-return valve (16) and/or the means (20) are produced by a so-called additive manufacturing method.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019108154.8A DE102019108154B4 (en) | 2019-03-29 | 2019-03-29 | Device for closing the working space ventilation duct of a retarder |
| DE102019108154.8 | 2019-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111746480A true CN111746480A (en) | 2020-10-09 |
Family
ID=72612954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010235314.5A Pending CN111746480A (en) | 2019-03-29 | 2020-03-30 | Device for closing a working chamber bleed air passage of a retarder |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111746480A (en) |
| DE (1) | DE102019108154B4 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019128727B4 (en) | 2019-10-24 | 2022-11-10 | Alfred Buck | Method of making a mechanical defoamer and mechanical defoamers |
| DE102020118081A1 (en) | 2020-07-09 | 2022-01-13 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Device for venting a hydraulic system |
| DE102021123835A1 (en) | 2021-09-15 | 2023-03-16 | Voith Patent Gmbh | Valve with oil separator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2505911A1 (en) * | 2005-04-15 | 2006-10-15 | George Patrick Crampton | Rotary foam distributor |
| EP1777134A2 (en) * | 2005-10-19 | 2007-04-25 | ZF FRIEDRICHSHAFEN Aktiengesellschaft | Bleeding device for hydrodynamic retarder |
| CN103354788A (en) * | 2011-02-07 | 2013-10-16 | 沃依特专利有限责任公司 | Hydrodynamic retarder |
| DE102013207004A1 (en) * | 2013-04-18 | 2014-10-23 | Voith Patent Gmbh | retarder |
| CN105121238A (en) * | 2013-04-17 | 2015-12-02 | 福伊特专利有限公司 | Hydrodynamic retarder |
| US20170007944A1 (en) * | 2014-02-27 | 2017-01-12 | Nabtesco Automotive Corporation | Oil separator and drain discharge system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918581B2 (en) | 1977-03-17 | 1984-04-27 | フオイト・ツルボ・ゲ−・エム・ベ−・ハ−・ウント・コンパニ−・カ−・ゲ− | hydrodynamic braking device |
| DE102012002039A1 (en) | 2012-02-03 | 2013-08-08 | Voith Patent Gmbh | Hydrodynamic retarder |
| DE102019128727B4 (en) | 2019-10-24 | 2022-11-10 | Alfred Buck | Method of making a mechanical defoamer and mechanical defoamers |
-
2019
- 2019-03-29 DE DE102019108154.8A patent/DE102019108154B4/en active Active
-
2020
- 2020-03-30 CN CN202010235314.5A patent/CN111746480A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2505911A1 (en) * | 2005-04-15 | 2006-10-15 | George Patrick Crampton | Rotary foam distributor |
| EP1777134A2 (en) * | 2005-10-19 | 2007-04-25 | ZF FRIEDRICHSHAFEN Aktiengesellschaft | Bleeding device for hydrodynamic retarder |
| CN103354788A (en) * | 2011-02-07 | 2013-10-16 | 沃依特专利有限责任公司 | Hydrodynamic retarder |
| CN105121238A (en) * | 2013-04-17 | 2015-12-02 | 福伊特专利有限公司 | Hydrodynamic retarder |
| DE102013207004A1 (en) * | 2013-04-18 | 2014-10-23 | Voith Patent Gmbh | retarder |
| US20170007944A1 (en) * | 2014-02-27 | 2017-01-12 | Nabtesco Automotive Corporation | Oil separator and drain discharge system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019108154A1 (en) | 2020-10-01 |
| DE102019108154B4 (en) | 2023-04-20 |
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