CN219588001U

CN219588001U - Hydrodynamic retarder

Info

Publication number: CN219588001U
Application number: CN202221743460.XU
Authority: CN
Inventors: D.劳克曼; T.比勒; A.马丁; M.德格; A.施莱贝尔
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2021-07-06
Filing date: 2022-07-06
Publication date: 2023-08-25
Anticipated expiration: 2032-07-06
Also published as: DE102021117390A1

Abstract

The utility model relates to a hydrodynamic retarder comprising a housing having a housing part and a cover, between which an enclosed tank is formed, which can be filled with a working medium and which comprises a fluid region (3). Furthermore, a tank ventilation system is provided, which has a connection to the fluid region on the one hand and to the environment on the other hand, and which comprises a labyrinth and a valve, which in its closed position closes the connection to the environment and in its open position opens the connection to the environment. In order to improve the retarder, it is proposed that the labyrinth of the tank ventilation system comprises a plurality of spaces and/or channels in the interior of the tank enclosed by the tank housing part and the tank cover, through which the air-working medium mixture can be guided for separating the working medium parts, wherein a drip channel is provided, through which the tank ventilation system is connected to the fluid region, so that working medium collection can be guided back from the tank ventilation system into the fluid region.

Description

Hydrodynamic retarder

Technical Field

The utility model relates to a working medium tank for a hydrodynamic retarder having a housing comprising a tank housing part and a tank cover, between which an enclosed tank is formed, which can be filled with working medium and which comprises a fluid region, the retarder having a tank ventilation system which has a connection to the fluid region on the one hand and to the environment on the other hand, wherein the tank ventilation system comprises a labyrinth and a valve which closes off the connection to the environment in its closed position and opens the connection to the environment in its open position.

Background

Hydrodynamic retarders are used, for example, in motor vehicle drive trains as wear-free brakes in order to brake motor vehicles, in particular trucks, buses or rail vehicles, by torque transmission by means of hydrodynamic cycling.

The retarder comprises a torus-shaped working space formed by a rotor and a stator, which is connected via a channel system to a working medium circuit with a working medium tank. Ventilation of the working space is achieved by a profile ventilation system, by means of which air can be emitted by means of a connection between the working space and the environment. When the retarder is switched into braking mode, the air present in the working space in non-braking mode is conducted from the working space to the environment via the profile ventilation system. In order to prevent working medium, in particular oil, from also entering the environment, an oil separator and a valve are provided.

Furthermore, a tank ventilation system is provided, by means of which air can be discharged by means of a connection between the working medium tank and the environment. When switching the retarder back into non-braking operation, the air that is fed into the working medium tank for switching the retarder to braking operation is again led from the tank into the environment via the tank ventilation system. In order to prevent working medium, in particular oil, from entering the environment with the air when the working medium tank is ventilated, an oil separator system and a valve are provided.

Two ventilation systems are known, for example, from DE 10 2013 207 004 A1. Tank ventilation is particularly required because in order to switch the retarder into braking operation, the working medium must be pressed from the working medium tank into the working space by means of compressed air. The filling degree of the working space and thus the braking power of the retarder is dependent on the air pressure, by means of which the filling degree is adjusted. This means that compressed air must be discharged in order to switch into non-braking operation or when the retarder braking torque is reduced. In particular, relatively high oil foam forms when the retarder is closed, wherein the oil fraction or oil component of the oil foam is not allowed to enter the environment. To prevent this, different channel guides between the working medium tank and the environment are known. A channel guide having a plurality of separation chambers with different configurations is thus known from CN 105 697 602 a.

The allowable oil discharge amount of modern retarders has been reduced such that the known protective measures for reducing the oil discharge when the working medium tank is ventilated are no longer sufficient.

Disclosure of Invention

The object of the present utility model is to propose a working medium tank for a hydrodynamic retarder that ensures a reduced oil discharge.

The technical problem is solved according to the utility model by a hydrodynamic retarder.

The proposed retarder comprises a housing with a housing part and a cover, between which an enclosed tank is formed, which can be filled with a working medium and which comprises a fluid region. Furthermore, a tank ventilation system is provided, which has a connection to the fluid region on the one hand and to the environment on the other hand, wherein the tank ventilation system comprises a labyrinth and a valve, which in its closed position closes the connection to the environment and in its open position opens the connection to the environment.

In order to improve the retarder, the labyrinth of the tank ventilation system comprises a plurality of spaces and/or channels in the interior of the tank enclosed by the tank housing part and the tank cover, through which an air-working medium mixture can be guided for separating working medium parts, wherein a drip channel is provided, through which the tank ventilation system is connected to the fluid region, so that working medium collection can be guided from the tank ventilation system (tank ventilation system) back into the fluid region.

The drip channel according to the utility model is a channel at the working medium collection point, which channel has a sufficiently large cross section that the working medium, for example oil, can drip through it.

Furthermore, a separating element can be arranged between the tank housing part and the tank cover, by means of which separating element individual spaces and/or channels of the labyrinth can be arranged between the tank housing part and the separating element or between the tank cover and the separating element.

In a preferred embodiment, the separating element can have a sealing region, by means of which the tank is sealed from the environment. The seal may be designed as a crimp seal with a region by means of which the tank can be divided into different regions, whereby an improved construction of the labyrinth is achieved.

The tank ventilation system is preferably arranged in the tank above the fluid region, wherein a defoaming space (or foam-eliminating space) can be provided between the fluid region and the labyrinth, which defoaming space is delimited toward the fluid region by means of strips with comb-shaped penetrations (german: kammdurchgang). The strip according to the utility model can also be a cast rib, wherein the comb-shaped penetration has a plurality of openings through which a working medium, for example oil, can pass and which cause oil-air bubbles to break to a large extent.

Furthermore, a second strip with a second comb-shaped penetration can be arranged between the defoaming space and the labyrinth. In this case, it is advantageous if the second comb-shaped penetration has a penetration that is 50% to 80% smaller than the penetration of the first comb-shaped penetration. This also causes the smaller oil-air bubbles to break up to a large extent.

An advantageous embodiment of the labyrinth comprises a lower and an upper comb-shaped space which is arranged in the housing part and which opens into the cover via a connecting channel, a first through channel through the separating element and from there is connected to a spiral channel in the cover via a second connecting channel.

Furthermore, a second through channel can be led from the centre of the spiral channel through the separating element back into the tank housing part, and can be connected with the inlet of the valve via a second transfer channel and a valve connection channel arranged in the tank housing part.

The outlet chamber may also be connected to a valve outlet of the valve before the de-oiled air enters the environment, wherein the outlet chamber may be a region formed by the tank housing part and the tank cover, which has a discharge opening for connection (or communication) to the environment, wherein the outlet chamber may be connected to the fluid region via the valve and the labyrinth.

The outlet chamber acts as a muffler and may have additional elements in the outlet opening that enable rapid ventilation without creating excessive disturbing noise.

Drawings

The utility model is illustrated below with reference to the drawings. In the drawings, individually:

FIG. 1 shows a retarder in a section along a rotor shaft;

fig. 2 shows a section A-A, i.e. the tank in section through the plane of the chamber;

fig. 3 shows a section B-B, i.e. the tank in a section through the comb plane;

fig. 4 shows a section C-C, i.e. the tank in section through the cover of the uptake shaft;

fig. 5 shows a section D-D, i.e. a sealing plane;

fig. 6 shows a section E-E, i.e. a top view with a first sealed through-penetration and an outlet chamber;

fig. 7 shows a section F-F, i.e. the cover in section through the spiral;

fig. 8 shows a section G-G, i.e. a top view with a second sealed through-penetration and an outlet chamber;

fig. 9 shows a section H-H, i.e. a top view of the outlet channel.

Detailed Description

All figures show a sectional view of the retarder cut. For simplicity of illustration, the sectioned component areas are not shaded. The sequence of the individual sectional views can show the flow direction of the air when switching the retarder from braking to non-braking operation.

The position of the section along the longitudinal direction of the retarder 1 can be seen from fig. 1, wherein fig. 1 shows the retarder 1 in a section along the rotor shaft 2. From this view it can be seen that the planes of sectioning A-A to D-D and F-F. The sectional planes for the top view, sections E-E and G-G are only depicted in fig. 5 and the position of section H-H is only depicted in fig. 4.

Fig. 1 shows a part of a retarder 1, from which fig. 1 three components of the retarder that are important for the utility model can be seen. The components include a tank housing 6, a seal 7 and a tank cover 8, which enclose a fluid region. To define the chambers and channels, strips are provided in the castings, namely the box housing 6 and the box cover 8, and through-penetrations are provided in the seal 7. The important areas that can be seen in fig. 1 include the fluid area 3 and the defoaming space 9 arranged in the tank housing part 6. For simplicity, the fluid region 3 is only partially shown, a significantly larger volume region is not shown in fig. 1 and is in the lower part of the retarder. The entire fluid region 3 and the tank ventilation system 5 required for ventilation are enclosed and bound to one another by a tank housing part 6, a tank cover 8 and a seal 7 arranged between the tank housing part and the tank cover. Furthermore, the rising channel 10 in the cover 8 can be seen, the general function of which is known from the prior art and is not described further here.

In non-braking operation, the working medium is stored in the fluid region 3. The tank 23 enclosed by the components 6, 7 and 8 can be pressurized with compressed air via the compressed air connection that is adjusted in order to feed oil or working medium into the working space 4 of the retarder, whereby the retarder 1 is switched into braking operation.

For the present utility model, only what happens when the retarder 1 is switched back to non-braking operation and oil is pumped back into the fluid zone 3 from the working space 4 by the pumping action of the retarder 1 is considered in the further description. In this working step, the compressed air must be able to escape from the tank into the environment. In order to prevent oil from entering the environment, a tank ventilation system 5 is provided, which is arranged substantially above the fluid region 3. The tank ventilation system 5 is made up of a plurality of chambers and/or channels. The compressed air is guided into the environment through the chambers and/or channels, wherein each chamber and/or channel section is designed to reduce the oil content of the compressed air or of the exhaust gas.

It is important for the utility model that each chamber and/or each channel section of the tank ventilation system 5 has a connection channel to the fluid region 3, through which separated oil can flow back into the fluid region 3 due to gravity.

Each individual chamber and/or channel section is shown in detail in fig. 2 to 9 and described below.

Fig. 2 depicts a section A-A through the tank housing part 6, wherein the plane of the section is referred to as the chamber plane, since the separation of the individual spatial areas 3, 9 or the labyrinth 10 is elucidated by this section. In this sectional area, the fluid area 3 is separated by a strip 25a from the defoaming space 9 arranged above it, which defoaming space 9 is in turn separated by a strip 25b from the labyrinth 10 located above it.

Fig. 3 depicts a section B-B through the tank housing part 6, wherein the plane of the section is called the comb plane, since the through-penetration between the areas is represented by said section. The strips 25a, 25b have a comb-shaped structure in this plane, wherein the rising oil foam bubbles are broken up by the comb-shaped penetrations. The comb-shaped through-portions (strips 11a, 11 b) have different cross-sections.

Labyrinth 10 is divided into a plurality of sections, which are described in more detail below. The seal 7 plays an important role for the labyrinth structure, since the individual sections of the labyrinth are delimited by the seal 7 and a change between the sections can be effected by the seal 7. The labyrinth 10 thus comprises a region only in the case housing part 6 or only in the case cover 7, and also through-channels 17, 18 which connect the sections in the case housing part 6 with the sections in the case cover 8 via the seal 7.

During ventilation, the air-oil mixture passes after the comb-shaped penetration (strip 11 b) into the first, lower chamber space 12 of the labyrinth 10, which is delimited by the tank housing part 6 and the seal 7.

The air-oil mixture then enters the upper chamber space 12b via the connecting channel 13, which upper chamber space 12b leads to the first through channel 14.

Fig. 4 and 5 depict a section C-C through the tank housing part 6 and a section D-D shows a view of the separating element 7. The separating element 7 is at the same time a seal between the tank housing 6 and the tank cover 8 and is cut in the section D-D in such a way that the seal run between the separating element 7 and the tank cover 8 can be seen.

The rising channel cover 27 is cut through the section C-C in the plane of the rising channel ventilation portion 28. A rising channel cover (Steigkanaldeckel) 27 separates a rising channel 26 located in the cover 8 from the tank 23. The rising channel vent 28 is connected to the rising channel 26 only through openings in the seal 7, the upper of which openings can be seen in fig. 5. The function of the rising channel 26 and its ventilation are well known from the prior art and are not further described here.

Furthermore, it can be seen from fig. 4 that the positions of some drip channels 29a, 29b, 29c, through which oil separated from the air-oil mixture can enter the fluid zone 3.

Fig. 6, 8 and 9 depict three top views of a tank 23 with a tank housing part 6, a seal 7 and a tank cover 8. The sealing penetration is visible from the top view, by means of which the section of the labyrinth 10 in the box housing part 6 is connected to the section of the labyrinth 10 in the box cover 8.

Here, fig. 6 depicts a section D-D, so that the first through channel 14 and the outlet chamber 21 can be seen. Fig. 8, section G-G, depicts the second through channel 17 as an important new detail.

Fig. 7 depicts a section E-E through the cover 8, wherein the plane of the section is arranged such that a first transfer channel 15 and a spiral channel 16 are shown. The air-oil mixture, which now has a lower oil content, flows through the second through-channel 17 into the first transfer channel 15 and from there into the spiral channel 16, as seen in the flow direction. These channels are formed between the cover 8 and the seal 7, so that there is a separation from the fluid region 3, wherein there is also a connection to the fluid region 3 via the drip channels 29a, 29b, 29c, 29d, so that the separated oil can be returned into the fluid region 3.

From the centre of the spiral channel 16, see fig. 8, the second through channel 17 leads through the seal 7 into a second transfer channel 18, the position of which can also be seen from fig. 2-4, i.e. a section through the tank housing part 6.

From the second transfer channel 17, the air mixture is led further into a valve connection channel 19, the position of which can be seen from the top view of fig. 9, i.e. the section H-H. In the closed position of the valve 20, there is no connection to the environment, so that compressed air can be introduced into the fluid region 3, so that oil is transported from the fluid region 3 into the working space of the retarder and thus the braking operation of the retarder is activated.

In the ventilation position of the valve 20, compressed air can escape from the tank again via the tank ventilation system 5 and enter the outlet chamber 21 via the valve outlet channel 19 and from there via the muffler or filter element 22 through the outlet opening 24 as deoiled air to the environment. The filter element 22 may comprise a nonwoven fabric that filters out the final oily aerosol from the air-working medium mixture.

Other details which are not described in connection with the utility model and which are therefore not set forth in more detail can be seen in all the drawings. The area above the fluid area 3, which is shown in the tank housing part 6 or in the tank cover 8 around the ventilation system 5, belongs to the fluid area 3 and is connected to the fluid area via a drain opening, even if the drain opening is not shown.

List of reference numerals

1. Retarder

2. Rotor shaft

3. Fluid region

4. Working space

5. Box ventilation system

6. Box casing piece

7. Sealing element

8. Case cover

9. Defoaming space

10. Maze

11a, 11b with comb-shaped through-penetration

12a, 12b lower/upper chamber spaces

13. Connection channel

14. First through channel

15. First transfer passage

16. Spiral channel

17. A second through passage

18. Second transfer channel

19. Valve connecting channel

20. Valve

21. Outlet chamber

22. Filter element

23. Box (BW)

24. Discharge opening

25a, 25b strip

26. Ascending channel

27. Ascending channel cover

28. Ascending channel ventilation part

29a, 29b, 29c.

Claims

1. A hydrodynamic retarder (1) having a housing comprising a housing part (6) and a cover (8), between which an enclosed tank (23) is formed, which can be filled with a working medium and which comprises a fluid region (3), having a tank ventilation system (5) which has a connection to the fluid region (3) on the one hand and to the environment on the other hand, wherein the tank ventilation system (5) comprises a labyrinth (10) and a valve (20) which in its closed position closes off the connection to the environment and in its open position opens off the connection to the environment,

it is characterized in that the method comprises the steps of,

the labyrinth (10) of the tank ventilation system (5) comprises a plurality of spaces and/or channels in the interior of the tank (23) enclosed by the tank housing part (6) and the tank cover (8), through which labyrinth an air-working medium mixture can be guided for separating working medium parts, wherein a plurality of drip channels are provided, through which the tank ventilation system (5) is connected to the fluid region (3), whereby working medium collections can be guided from the tank ventilation system (5) back into the fluid region (3).

2. Hydrodynamic retarder (1) according to claim 1,

it is characterized in that the method comprises the steps of,

a separating element (7) is arranged between the tank housing part (6) and the tank cover (8), by means of which separating element a plurality of individual spaces and/or channels of the labyrinth (10) are separated between the tank housing part (6) and the separating element (7) or between the tank cover (8) and the separating element (7).

3. Hydrodynamic retarder (1) according to claim 2,

it is characterized in that the method comprises the steps of,

the separating element (7) has a sealing region, by means of which the tank is sealed from the environment.

4. Hydrodynamic retarder (1) according to claim 1,

it is characterized in that the method comprises the steps of,

the tank ventilation system (5) is arranged above the fluid region (3) within the tank (23), wherein a defoaming space (9) is provided between the fluid region (3) and the labyrinth (10), which defoaming space is delimited toward the fluid region (3) by means of a first strip having a first comb-shaped penetration (11 a).

5. Hydrodynamic retarder (1) according to claim 4,

it is characterized in that the method comprises the steps of,

a second strip having a second comb-shaped penetration (11 b) is arranged between the defoaming space (9) and the labyrinth (10).

6. Hydrodynamic retarder (1) according to claim 5,

it is characterized in that the method comprises the steps of,

the second comb-shaped penetration portion (11 b) has a penetration portion that is 50% to 80% smaller than the penetration portion of the first comb-shaped penetration portion (11 a).

7. Hydrodynamic retarder (1) according to claim 2,

it is characterized in that the method comprises the steps of,

the lower and upper comb-shaped spaces (12 a, 12 b) of the labyrinth (10) are arranged in the tank housing part (6) and open into the tank cover (8) via a connecting channel (13), a first through channel (14) through the separating element (7) and are connected therefrom via a second connecting channel to a spiral channel (16) in the tank cover (8).

8. Hydrodynamic retarder (1) according to claim 7,

it is characterized in that the method comprises the steps of,

a second through channel (17) leads from the center of the spiral channel (16) through the separating element (7) back into the tank housing part (6).

9. Hydrodynamic retarder (1) according to claim 8,

it is characterized in that the method comprises the steps of,

the second through-channel (17) is connected to the inlet of the valve (20) via a second transfer channel (18) and a valve connecting channel (19) arranged in the tank housing part (6).

10. Hydrodynamic retarder (1) according to claim 1,

it is characterized in that the method comprises the steps of,

an outlet chamber (21) is connected to a valve outlet of the valve (20), wherein the outlet chamber (21) is a region formed by the tank housing part (6) and the tank cover (8) having a discharge opening (24) for connection to the environment, wherein the outlet chamber (21) can be connected to the fluid region (3) via the valve (20) and the labyrinth (10).