DE102013209291A1 - Coupling arrangement for an accessory drive and method for operating a clutch assembly - Google Patents

Abstract

The invention relates to a clutch arrangement for an auxiliary unit drive and a method for operating a clutch arrangement with which the auxiliary unit drive is disconnected from the drive motor for different operating states of a vehicle.

Description

Field of the invention

The invention relates to a clutch assembly for an auxiliary drive and a method for operating a clutch assembly, with the separate for different operating conditions of a vehicle, the accessory drive from the drive motor.

In modern vehicles with a conventional internal combustion engine, the ancillaries such as e.g. Generator, air conditioning, water pump, etc. usually driven by a belt drive, which is connected by a crankshaft directly to the engine. The direct coupling of belt operation to the internal combustion engine fundamentally requires a compromise with regard to efficiency, since in transient or transient operation the belt drive is rigidly coupled to the rotational speed of the internal combustion engine.

From the prior art, for example from the DE 10 2011 010 284 A1 . DE 10 2009 014 027 A1 or DE 100 07 356 A1 Various ways are known to provide ancillaries with energy.

In different driving situations, however, it would be advantageous not to drive such ancillaries via the internal combustion engine, since it uses the mechanical power generated by the internal combustion engine proportionally, so that, for example, for the acceleration of the vehicle not the entire engine power is available. Furthermore, it is not possible with such a permanently coupled drive of the ancillaries to operate in a vehicle with automatic start-stop system during engine standstill installed in the auxiliary drive air conditioning compressor, which means reduced comfort for the vehicle occupants

The object of the invention is therefore to enable a demand-driven direct drive of the ancillaries and for the aggregate operation of the crankshaft separable design.

Summary of the invention

The object is achieved by a coupling arrangement according to claim 1 and by a method according to claim 7.

Proposed is a clutch assembly for an auxiliary drive, in which the auxiliary drive from the crankshaft depending on the operating condition of the vehicle is specifically decoupled from the engine.

According to a further aspect of the invention, a method is proposed for operating a drive arrangement for an auxiliary drive of a vehicle, in which the auxiliary drive can be driven by a crankshaft of an internal combustion engine. The accessory drive and associated with this ancillary components of the vehicle can be selectively driven by the crankshaft with optimized efficiency depending on the operating condition of the vehicle. In this way, a particularly effective operation of the accessory operation is made possible.

The coupling arrangement according to the invention is intended to enable, in particular, the following operating states:
In a first operating state, the accessory drive is stable in a state coupled to the crankshaft. In the first operating state, the auxiliary drive can be driven solely by the crankshaft.

In a second operating state, the accessory drive is stable in a decoupled from the crankshaft state. This is desirable when the engine is at a standstill - for example for stationary air conditioning. In this case, the auxiliary drive is possible for example by a separate drive, for example by a starter generator.

It is also possible, in a so-called sailing operation of the vehicle, in which the engine is decoupled from the drive train and / or off, decouple the auxiliary drive from the crankshaft and drive separately.

In addition, in a third operating state, the accessory drive may be durable with the crankshaft in a slipping frictionally engaged condition. This makes it possible to use the inertia of the ancillary components for braking the internal combustion engine, so that when stopping the engine, the range of the natural frequency is traversed faster and thus uncomfortable vibrations are reduced

To start the internal combustion engine, the crankshaft can be converted into a slip-frictional connection with the accessory drive to tow the engine through the running accessory drive. Here, the accessory drive can be driven by the starter-generator.

The invention causes by the optimized belt drive on the one hand, a reduction in fuel consumption by the drag torque of the belt drive minimized or temporarily eliminated. In addition, the comfort is increased by that air conditioning when the engine is stopped by the drive of the air conditioning compressor via the starter generator is made possible.

Other modes of operation, such as tow launch, active boost, passive boost and recuperation, are also possible. Another advantage is the optimal space utilization

Further features of the invention will become apparent from the following description and from the drawings, in which several embodiments of the invention are shown in simplified form. Show it:

1 a schematic representation of a belt drive for ancillaries,

2 a sectional view of a pulley with brake and bearing segments,

3 Arrangement of the brake segments on the crankshaft pulley,

4 Arrangement of the bearing segments on the crankshaft pulley.

Detailed description of the drawings

1 shows a belt drive 10 for ancillaries with a pulley of an air conditioning compressor 14 , a pulley of a generator 13 and a pulley of the crankshaft 12 that over the V-belt 11 Air conditioning compressor, generator or other ancillaries drives.

2 shows a schematic arrangement of a pulley 12 as with the clutch assembly according to the invention 30 with the crankshaft 20 an internal combustion engine to be coupled and decoupled configured. The pulley is inside a storage 38 mounted and includes in a region located at least partially within the pulley cross section a number of bearing segments 32 , The bearing segments 32 are around the crankshaft 20 circumferentially connected thereto and form arranged on a circular line spaced bearing sections. Between these bearing sections and the storage 38 the pulley is stored. The circular line therefore corresponds to an inner circumference arranged in the cross section of the belt pulley.

Further recognizable are coupling segments 31 that are just like the bearing segments 32 at least partially within the pulley cross section and around the crankshaft 20 circumferentially connected to this. Unlike the bearing segments 32 permanently in sliding connection with the pulley 12 are these brake segments 31 with the inner circumference of the pulley positively and / or non-positively connectable. This releasable connection via the preferably at least one actuator 36 , the each coupling segment 31 assigned.

According to an alternate arrangement of the segments is provided. Shown is a triple pairwise segmentation with a total of three bearing segments 32 and three coupling segments 31 , It is advantageous to form the coupling segments larger than the bearing segments, so that in the illustration in 2 For example, each a coupling segment of 70 ° and a bearing segment of 50 ° result in a 120 ° section, there are thus three thus formed 120 ° sections. In this embodiment, therefore, 210 ° of the circumference are available for coupling transmission and 150 ° for pure storage.

Equally encompassed by the invention, however, is any further number of segments.

3 shows a coupling segment according to the invention 31 in a plane along the longitudinal axis of the crankshaft 20 , On the crankshaft 20 there is a clutch lever bearing 34 , on the preferably two clutch levers 33 are stored. A clutch lever 33 includes an arm that is connected to the pulley 12 can be associated, and an arm whose leverage is via an actuator 36 is being used. The actuator is acted upon by a spring 37 opposite.

Not shown in the figure, but also included in the concept of the invention is a centrally acting clutch actuator.

Can be used, for example, electrically, pneumatically or hydraulically aktuierbare systems to the pulley 12 torque-free switch and thus the belt drive of the crankshaft 20 to separate.

By driving the actuator, the coupling segments 31 from the pulley 12 be solved so that the crankshaft 20 free under the pulley 12 can run around. The lever mechanism can be configured with both a pressure actuator and a Zugaktuator.

By actuating the device, no axial force is transmitted to the crankshaft input bearing. The actuator 36 is preferably self-centering, rotationally fixed and executed outwardly force neutral.

The arms, with the pulley 12 should be associated, each have a clutch lining 35 on. This one can either wear-free designed as a steel-steel design or as any other conceivable friction pairing. For the pads can have a wear compensation.

In a preferred embodiment, the arrangement is carried out in a sealed variant, in order to avoid negative effects of splashing water, stone chips or heavy pollution.

Furthermore preferably, the arrangement according to the invention can be carried out balancing.

4 shows a bearing segment according to the invention 32 in a plane along the longitudinal axis of the crankshaft 20 , On the crankshaft 20 is the storage segment. Arranged on the bearing segment is the pulley 12 ,

LIST OF REFERENCE NUMBERS

10

 Accessory drive

11

 fan belt

12

 Pulley of crankshaft

13

 Pulley of the generator

14

 Pulley of air conditioning compressor

20

 crankshaft

30

 clutch assembly

31

 coupling segment

32

 bearing segment

33

 clutch lever

34

 Clutch lever bearing

35

 clutch lining

36

 actuator

37

 feather

38

 storage

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011010284 A1 [0003]
• DE 102009014027 A1 [0003]
• DE 10007356 A1 [0003]

Claims (10)

Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ), by a crankshaft ( 20 ) of an internal combustion engine via a pulley ( 12 ) Can be driven, characterized in that the coupling arrangement bearing segments ( 32 ) and coupling segments ( 31 ) in operative engagement with the pulley ( 12 ) stand. Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ) according to claim 1, further comprising a storage ( 38 ), the bearing segments ( 32 ) are arranged so that the pulley ( 12 ) between storage ( 38 ) and the bearing segments ( 32 ) is stored. Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ) according to claim 1 or 2, characterized in that the brake segments ( 31 ) are arranged so that a separable force and / or positive connection between the crankshaft ( 20 ) and pulley ( 12 ) causes. Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ) according to one of claims 1 to 3, wherein the coupling segments ( 31 ) on the crankshaft and at least partially to the pulley ( 12 ) are arranged on the inside. Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ) according to one of claims 1 to 4, wherein each coupling segment ( 31 ) at least one actuator ( 36 ) and the actuator at least one counteracting spring ( 37 ) assigned. Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ) according to claim 5, wherein each brake segment ( 31 ) at least one clutch lever ( 33 ) with a clutch lever bearing ( 34 ) and a clutch lining ( 35 ), wherein one of the actuators ( 36 ) and the spring ( 37 ) are arranged interacting with each other so that the coupling segment ( 31 ) in positive engagement and / or traction with the pulley ( 12 ) can be brought. Coupling arrangement ( 30 ) for an auxiliary drive ( 10 ) according to one of claims 1 to 4, comprising a central clutch actuator for controlling the clutch segments ( 31 ). Method for operating a clutch arrangement ( 30 ) for an auxiliary drive ( 10 ) according to one of claims 1 to 7, characterized in that, depending on the operating state of the vehicle, the accessory drive ( 10 ) with the crankshaft ( 20 ) is coupled. Method for operating a clutch arrangement ( 30 ) for an auxiliary drive ( 10 ) according to claim 1 to 7, characterized in that, depending on the operating state of the vehicle, the auxiliary drive ( 10 ) is coupled with a drive separate from the engine. Method for operating a clutch arrangement ( 30 ) for an auxiliary drive ( 10 ) according to one of claims 1 to 7, wherein the coupling segments ( 31 ) in trailing frictional engagement with the pulley ( 12 ) operate.

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