DE102007056495A1 - Hydrodynamic clutch, has impeller and turbine, which form torus-shaped work space with one another, and drawing disk provided with channels and arranged perpendicular to rotation axis of clutch - Google Patents

Abstract

The clutch has an impeller (1) and a turbine (2), which form a torus-shaped work space (3) with one another. A drawing disk (7) e.g. flat-parallel circular disk, is provided with channels. The disk is arranged perpendicular to a rotation axis of the clutch. One of the channels runs spirally in a view seen from above the disk. A clutch shell is rotatably connected with a clutch wheel. One side of the disk includes a characteristic, which deviates from an axially-perpendicular plane. Each channel is provided with an inlet within a radial outer region and an outlet within a radial inner region.

Description

The The invention relates to a hydrodynamic coupling with a pump wheel and a turbine wheel, both of which have a toroidal working space with each other form.

Hydrodynamic Couplings have the advantage of elastic working behavior and a gentle, relatively bumpless transmission a torque, for example from a motor to a conveyor belt. However, there are numerous cases in practice in which there are desirable is the transmissible torque to limit or lower. This will cause the engine to start even more spared.

DE 43 11 350 A1 shows and describes a hydrodynamic coupling with an automatic torque limiter. Here, a storage space is provided radially within the impeller. Before starting the clutch, most of the oil, which serves as a working medium, is located within said storage space. When starting the clutch, the impeller is first circulated. Since the working space initially contains little or no oil, the turbine wheel is initially not yet driven. In the storage space, an oil ring is formed, which gradually enters via an overflow edge in that part of the working space, which is formed from the impeller, and finally flows completely into the working space. In this way, a relatively smooth start is achieved.

The Most hydrodynamic couplings use oil as the operating medium operated. During operation, the oil heats up. It must therefore be cooled. For this purpose, the oil constantly circulated in a cooling circuit. It is passed through a heat exchanger, which is located outside the hydrodynamic coupling. The entire hydrodynamic coupling is of a housing enclosed, that has a first port for discharging the oil and a second port for reintroducing the oil after passing through the heat exchanger owns.

The Discharge takes place by dipping a scoop - so-called Dynamic pressure pump - in an oil sump. The oil sump is formed from an annular shell, which is in operation the hydrodynamic coupling - together with the impeller - rotates. The mouthpiece of the dynamic pressure pump dives more or less deep into the oil sump, which is in the aforementioned shell forms.

The Scoop can be designed such that its mouthpiece is displaceable in the radial direction. This can be the degree of filling of the hydrodynamic coupling for the purpose of their regulation.

While of the operation is the space in which the scoop flowed through by operating medium. The operating medium bounces on the scoop with considerable energy. This has two significant drawbacks: First, this energy is consumed and thus reduces the overall efficiency of the hydrodynamic pump. On the other hand, the components involved, in particular the scoop itself, in view of the necessary strength be dimensioned accordingly.

Of the Invention is based on the object, a hydrodynamic coupling to be designed with a scooping device such that the Optimized efficiency and with sufficient strength claimed Components can be dimensioned smaller.

These The object is solved by the features of claim 1. Accordingly, the inventors see instead of the scoop a scoop in front. The scoop is at least approximately arranged in an axially perpendicular plane. It is provided with at least one bore as a discharge channel. The Bore has an inlet in a radially outer Region, and an outlet in a radially inner region. It can stand or circulate.

The Disc can be a plane-parallel disc. deviations These are conceivable. The scoop can, for example - in Side view - be cranked to yourself to adapt to the space.

The Bore can be a radial bore. It can also be sort of like Secants are lost. You may also be bent, for Example in a radially outer area as a secant run, and in a radially inner region as a radial bore. Also Spiral shapes are conceivable.

The The invention is explained in more detail with reference to the drawing. The following is shown in detail:

1 shows a hydrodynamic coupling in an axial section during startup.

2 shows the clutch according to 1 at rated operation.

3 shows the clutch according to 1 at partial filling.

4 shows the scoop of the clutch according to the 1 to 3 in plan view.

5 shows the scoop according to 4 in an axial section (only upper part).

6 shows a further scoop in plan view.

7 shows a further scoop in plan view.

8th shows a further scoop in plan view.

9 shows a further scoop in plan view.

The in the 1 to 3 shown hydrodynamic coupling has a pump 1 and a turbine wheel 2 on. These form together a toroidal working space 3 ,

With the impeller 1 is a pump shell 4 rotatably connected. This forms a storage space together with the impeller 5 , The turbine wheel 2 is from a housing 6 enclosed.

In the storage room 5 there is a fixed scoop 7 ,

The storage space 5 is dimensioned such that the filling in the working space 3 is greatly reduced in the starting state. That in the storage room 5 located operating medium - here an oil - is through the scoop 7 skimmed off and the work space 3 fed radially inward. The impeller has nozzle bores 1.1 . 1.2 on, over which a conductive connection between working space 3 and storage space 5 will be produced. By an appropriate vote of the nozzle bores and by a corresponding adjustment of valves (not shown here), the time course of the torque increase can be up to the complete filling of the working space 3 establish.

1 shows the conditions during startup of the hydrodynamic coupling, with a high slip is present.

2 shows the conditions at maximum filling. Here, the hydrodynamic coupling transmits the maximum possible moment. The mirror in the storage room 5 is located in the peripheral area of the scoop 7 , The scoop 7 has channels 7.1 on. By this oil is fed into the storage space. Please refer 4 ,

3 shows the conditions at partial filling. The oil level in the storage room 5 lies radially within the circumference of the scoop 7 ,

In 4 you see a scoop 7 in plan view. In this case, six discharge channels are provided. Each channel has a secant channel section 7.1 and a radial channel section 7.2 on.

5 shows a slightly different embodiment of the scoop 7 with the corresponding channels. The scoop 7 is bent. Only in its radially inner region does it pass axially. In the radially outer region, it is inclined towards the axis-perpendicular plane. It thus has plate shape. One recognizes the radially outer channel section 7.1 , This opens into a ring channel 7.3 that divides the partial streams from several radially outer channels 7.1 collects and continues radially inward through radial lines, not shown here.

6 shows another possible embodiment of a scoop. Here are seven channels 7.1 intended. These have spiral shape.

In the embodiment according to 7 is - for example only - a single channel 7.1 shown. This has at its radially outer end a manifold 7.5 on, whose mouth is opposite to the flow of the working medium.

In the 8th shown scoop has two channels. channel 7.1 runs straight and along a radial. channel 7.2 on the other hand, it also runs straight in an inner area, and is against the circumference of the scoop 7 curved in the direction of rotation - see the arrow.

In the 9 shown scoop again has two channels 7.1 and 7.2 on. channel 7.1 runs along a radial and is straight. channel 7.2 has an inner, rectilinear portion, and an outer, curved portion. The curvature runs counter to the direction of rotation - see again the arrow.

The scoop does not necessarily have to be a disk of constant thickness. For example, it can be waisted in its axial section and have its thinnest point in the center. But it can also - again in an axial section - taper from the center to the periphery, thus be thickest in the center. Furthermore, the scoop can along the course of a channel 7.2 be thickened.

1

impeller

1.1

nozzle bore

1.2

nozzle bore

2

turbine

3

working space

4

pump shell

5

storage space

6

casing

7

adding disc

7.1

channel or channel section

7.2

channel section

7.3

annular channel

7.4

baffle

7.5

elbow

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4311350 A1 [0003]

Claims (10)

Hydrodynamic coupling having the following features: 1.1 with a pump impeller ( 1 ) and a turbine wheel ( 2 ), which together form a toroidal working space ( 3 ) form; 1.2 with a scooping device having a discharge channel ( 7.1 . 7.2 . 7.3 ) having a radially outer inlet and a radially inner outlet; characterized by the following features: 1.3 as scooping device is a scooping disc ( 7 ) is provided, which is arranged perpendicular to the axis of rotation of the hydrodynamic coupling, and the at least one discharge channel ( 7.1 . 7.2 . 7.3 ) having. Hydrodynamic coupling according to claim 1, characterized in that the discharge channels ( 7.1 . 7.2 ) extend radially. Hydrodynamic coupling according to claim 1, characterized in that the discharge channels ( 7.1 ) run like a secant. Hydrodynamic coupling according to claim 1, characterized in that the discharge channels ( 7.1 ), in plan view of the scoop disc ( 7 ), circular arc or spiral. Hydrodynamic coupling according to one of the claims 1 to 4, characterized in that a coupling shell provided is, which is rotatably connected to the clutch. Hydrodynamic coupling according to one of claims 1 to 5, characterized in that at least one side surface of the scoop disc ( 7 ) has a course that deviates from an axially perpendicular plane. Hydrodynamic coupling according to claim 6, characterized in that the scoop disc ( 7 ) is waisted seen in an axial section. Hydrodynamic coupling according to one of claims 1 to 6, characterized in that the scoop disc ( 7 ) - seen in an axial section - tapers from its center to its periphery. Hydrodynamic coupling according to one of claims 1 to 8, characterized in that the scoop disc ( 7 ) constantly circulates. Hydrodynamic coupling according to one of claims 1 to 9, characterized by the following features: 10.1 the scoop disc ( 7 ) is - seen in an axial section - plate-shaped, so that it has a radially inner, axially perpendicular portion, and a radially outer, inclined to the axis region; 10.2 the scoop ( 7 ) encloses at least one radially outer channel section ( 7.1 ) and a ring channel ( 7.3 ), in the partial streams from the radially outer channel sections ( 7.1 ).