EP2300711B1 - Compressor system for supplying compressed air to a utility vehicle, and method for the operation of a compressor system - Google Patents

Description

The invention relates to a compressor system for compressed air supply of a commercial vehicle with a compressor, a clutch and a hydraulic pump, wherein the compressor system is drivable via a drive train and the compressor is completely decoupled by the clutch of a drive motor.

The invention further relates to a method for operating a compressor system for supplying compressed air to a commercial vehicle with a compressor, a clutch and a hydraulic pump, wherein the compressor system is driven by a drive train and the compressor is completely decoupled from the drive motor by the clutch.

Modern commercial vehicles have many subsystems that are operated with compressed air. These include, for example, a compressed air operated service brake or air suspension. In order to ensure the supply of compressed air to these subsystems, a compressed air supply device is normally provided in the commercial vehicle, which comprises a compressor. This compressor is mechanically driven by a drive motor of the commercial vehicle. The coupling of the compressor is normally via a toothing at one end of the crankshaft of the drive motor. The compressor itself has a further crankshaft, on whose side facing away from the drive side toothing often a hydraulic pump, for example a power steering pump, is arranged. The connection of the hydraulic pump to the shaft of the compressor is carried out with the help of a radial play balance bearing, for example a Maltese cross, or a multi-tooth bearing, which can handle a higher torque, but tolerates a lesser clearance compared to the Maltese cross.

In addition, a clutch is often provided in modern commercial vehicles, which is able to save energy to completely decouple the compressor from the drive motor. In the conventional arrangement of the hydraulic pump on the output side of the crankshaft of the compressor, this means that simultaneously with the compressor and the hydraulic pump is disconnected from the drive. However, this means that, for example, no steering assistance in the form of a power steering for the commercial vehicle would be more available. However, this is not tolerable for safety reasons.

There are several alternatives known to solve this problem. One possibility is to reverse the steering assist when the compressor is off. In this variant, it is assumed that the compressor can be disengaged mainly on highways. On these routes, the steering assistance is not absolutely necessary because of the small radii of the curves. However, if a steering maneuver, for example, to avoid, must be performed, the power steering is missing and the compressor would have to be switched on.

Another option is to operate the steering assistance purely electrically. It is then no longer mechanically powered by the drive motor power steering pump and the pump requires its own electric motor. This is in principle feasible, but the electric motor must provide a large power of about 50 KW, which is why he also claimed appropriate space and weight. Furthermore, the energy consumption is less favorable.

It is therefore the object of the present invention to develop the generic compressor system such that the complete decoupling of the compressor from the drive motor with simultaneous operation of the hydraulic pump is possible without much additional mechanical effort.

This object is solved by the features of the independent claims.

Advantageous embodiments and further developments of the invention will become apparent from the dependent claims.

The compressor system according to the invention builds on the generic state of the art in that the drive train comprises a gear drive, via which the hydraulic pump is drivable and that the coupling between the gear drive and the compressor is arranged. Arranging the coupling between the gear drive and the compressor does not mean the spatial position of the coupling between the gear drive and the compressor. The term "between" rather describes the path of the transmitted force. The power is transmitted from the gear drive via the clutch to the compressor. However, it is conceivable that due to structural needs, the coupling is also arranged in space between the gear drive and the compressor. The arrangement of the clutch between the gear drive and the compressor, a decoupling of the compressor of the drive motor is possible without affecting the drive of the hydraulic pump. As an additional mechanical component only the gear drive in the drive train is necessary, via which a power take-off for the hydraulic pump is provided. Furthermore, the mechanical connection of the compressor system to the drive motor can remain unchanged compared to a conventional compressor system.

Preferably, it is provided that the compressor and the hydraulic pump are integrated in a common housing. The placement of compressor and hydraulic pump in a common housing facilitates the cooling of both components, as a common cooling system can be used. For example, in a simple manner, the common housing can be cooled as a whole.

According to the invention, the gear drive has a ratio equal to one. By providing a gear ratio equal to one in the gear drive, the compressor and the hydraulic pump can be operated at different speeds. This allows separate optimization of the compressor and hydraulic pump for the vehicle.

A further advantage is that the compressor system comprises a further drive on the side facing away from the wheel drive side of the compressor. By providing a further drive on the side facing away from the wheel drive side of the compressor, a mechanically more stable construction is made possible. The further drive can be designed, for example, as a further wheel drive, as a belt drive or as a chain drive. Furthermore, results on the side facing away from the wheel drive side of the compressor, a connection option for the hydraulic pump, which is not limited by the compressor in terms of the available space. In this design, a second connection possibility can arise, which can be used to connect a further auxiliary unit, for example a coolant pump.

It can be provided that the gear drive is partially mounted with a bushing and that the socket at the same time supports a crankshaft of the compressor. The gears used in the gear drive are usually rotatably mounted, wherein the simultaneous use of a bearing point of a gear of the gear drive for supporting the crankshaft simplifies the mechanical construction of the compressor system.

In particular, it is provided that the gear drive and the crankshaft are freely rotatably coupled to each other via the socket. The freely rotating coupling between the gear drive and the crankshaft allows only the switching off of the compressor via the clutch.

The generic method for operating a compressor system is further developed in that the hydraulic pump is driven by a drive train of the drive train and that the drive train between the gear drive and the compressor is disconnected to decouple the compressor from the drive motor. In this way, the advantages and particularities of the compressor system according to the invention are also implemented in the context of a method. This also applies to the following particularly preferred embodiments of the method according to the invention.

This is usefully further developed in that the compressor and the hydraulic pump are integrated into a common housing.

According to the invention, it is provided that the hydraulic pump is driven via the gear drive with a ratio not equal to one.

It is particularly preferred that the compressor is driven by a further drive, which is arranged behind the gear drive seen from the drive train.

The invention will now be described by way of example with reference to the accompanying drawings by way of particularly preferred embodiments.

Figur 1

eine schematische Darstellung eines Nutzfahrzeugs mit einem erfindungsgemäßen Kompressorsystem;

Figur 2

eine Außenansicht eines erfindungsgemäßen Kompressorsystems;

Figur 3

einen Querschnitt durch ein erfindungsgemäßes Kompressorsystem;

Figur 4

eine Außenansicht eines erfindungsgemäßen Kompressorsystems ohne angebaute Hydraulikpumpe;

Figur 5

einen Querschnitt durch ein erfindungsgemäßes Kompressorsystem ohne angebaute Hydraulikpumpe;

Figur 6

einen schematischen Aufbau eines Kraftübertragungsweges in einem erfindungsgemäßen Kompressorsystem;

Figur 7

eine schematische Darstellung eines Nutzfahrzeugs mit einer zweiten Ausführungsform eines erfindungsgemäßen Kompressorsystems;

Figur 8

eine schematische Darstellung eines Nutzfahrzeugs mit einer dritten Ausführungsform eines erfindungsgemäßen Kompressorsystems;

Figur 9

eine schematische Darstellung eines Nutzfahrzeugs mit einer vierten Ausführungsform eines erfindungsgemäßen Kompressorsystems;

Figur 10

eine zweite Ausführungsform eines Kraftübertragungsweges in einem erfindungsgemäßen Kompressorsystem;

Figur 11

eine zweite Außenansicht eines erfindungsgemäßen Kompressorsystems;

Figur 12

eine dritte Ausführungsform eines Kraftübertragungsweges in einem erfindungsgemäßen Kompressorsystem und

Figur 13

eine vierte Ausführungsform eines Kraftübertragungsweges in einem erfindungsgemäßen Kompressorsystem.

Show it:

FIG. 1

a schematic representation of a commercial vehicle with a compressor system according to the invention;

FIG. 2

an external view of a compressor system according to the invention;

FIG. 3

a cross section through a compressor system according to the invention;

FIG. 4

an external view of a compressor system according to the invention without attached hydraulic pump;

FIG. 5

a cross section through a compressor system according to the invention without attached hydraulic pump;

FIG. 6

a schematic structure of a power transmission path in a compressor system according to the invention;

FIG. 7

a schematic representation of a commercial vehicle with a second embodiment of a compressor system according to the invention;

FIG. 8

a schematic representation of a commercial vehicle with a third embodiment of a compressor system according to the invention;

FIG. 9

a schematic representation of a commercial vehicle with a fourth embodiment of a compressor system according to the invention;

FIG. 10

a second embodiment of a power transmission path in a compressor system according to the invention;

FIG. 11

a second external view of a compressor system according to the invention;

FIG. 12

a third embodiment of a power transmission path in a compressor system according to the invention and

FIG. 13

A fourth embodiment of a power transmission path in a compressor system according to the invention.

In the following drawings, like reference characters designate like or similar parts.

FIG. 1 shows a schematic representation of a commercial vehicle with a compressor system according to the invention. The illustrated commercial vehicle 20 includes a drive motor 18 and is driven by the drive motor 18 via a drive train 28. From the drive train 28, a drive train 16 for a compressor system 10 is branched off via a drive 32, which comprises a compressor 12 and a hydraulic pump 14. The compressor system 10 is driven as a whole by the drive train 16, wherein via a gear drive 30, a power take-off 24 is provided for driving the hydraulic pump 14. Between the Rädertrieb 30 and the compressor 12, a clutch 22 is arranged, which can be opened or closed, without affecting the operation of the hydraulic pump 14. The switching of the clutch 22 can be taken over by a control unit, not shown, which, for example, part a compressed air treatment plant of the commercial vehicle 20 may be. The ratio of the gear drive 30 can be freely selected to allow a separate optimization of hydraulic pump 14 and compressor 12.

FIG. 2 shows an exterior view of a compressor system according to the invention. The illustrated compressor system 10 is integrated in a common housing 26, wherein in the upper region of the compressor and in the lower region, the hydraulic pump is arranged.

FIG. 3 shows a cross section through a compressor system according to the invention. The illustrated compressor system 10 is a cross-section through a section of FIG FIG. 2 illustrated outside view. Again, the compressor 12 is arranged in the upper region and the power steering pump 14 in the lower region. The drive train 16 enters behind a standard connection port 34 in the common housing 26 of the compressor system 10, wherein subsequently via a gear drive 30, a power take-off 24 is provided for driving a hydraulic pump 14. Between the gear drive 30 and a compressor 12, a clutch 22 is further arranged. By using a single drive train 16 with a normable connection port 34 for driving the compressor system 10, a standardized connection of the compressor system 10 to the drive motor 18 can take place.

In particular, no further modifications in the area of the drive train 16 are required if a compressor system according to the invention is used instead of a generic compressor system.

FIG. 4 shows an external view of a compressor system according to the invention without attached hydraulic pump. Shown is the arranged in the housing 26 compressor 12, which is separable via a clutch control port 36 of the drive train not visible in this illustration. In the foreground are still visible a connection flange 38 and a further connection flange 38 'to which the hydraulic pump can be connected. Depending on requirements, it is conceivable that two hydraulic pumps on the connecting flanges 38, 38 'simultaneously to operate, or supply other ancillaries with drive energy.

FIG. 5 shows a cross section through a compressor system according to the invention without attached hydraulic pump. This is shown from the FIG. 4 already known compressor system in a sectional view. In particular, the wheel drive 30 and a further wheel drive 44, which are arranged on two different sides of the compressor 12, are visible. The clutch 22 is disposed between the further gear train 44 and the compressor 12 and is operable via the clutch control port 36. The transmission ratio of the further gear drive 44 can be chosen freely analogous to the transmission ratio of the gear drive 30. The transmitted from the drive train, not shown on the gear drive 30 force is transmitted via a shaft 42 to the other gear drive 44. From there it can be tapped at the connecting flanges 38, 38 ', or is transmitted via the coupling 22 to the compressor 12. The connection between a crankshaft 46 assigned to the compressor 12 and the wheel drive 30 takes place via a bush 40 which supports both a gear of the gear drive 30 and the crankshaft 46. The use of two separate sockets, which can then be positioned arbitrarily, is also possible. The storage takes place freely rotating, so that the gear of the gear drive 30 can rotate independently of the crankshaft 46.

FIG. 6 shows a schematic structure of a power transmission path in a compressor system according to the invention. Power is transmitted in the form of a torque to the gear drive 30 via the drive train 16. The illustrated gear drive 30 comprises three gears, which are shown without their teeth for the sake of simplicity. The force introduced into the wheel drive 30 is transmitted via the shaft 42 to the further wheel drive 44, which has two connecting flanges 38, 38 ', to which auxiliary units, not shown, for example the hydraulic pump, can be connected. From the further gear drive 44, the crankshaft 46 of the compressor is driven via the clutch 22, which is mounted on the wheel drive 30 side facing by means of a sleeve 40. The sleeve 40 stores at the same time a gear wheel of the gear drive 30, wherein the crankshaft 46 and the gear wheel of the gear drive 30 are independently rotatable. The sleeve 40 thus supports the crankshaft 46 in the compressor housing 26 and the gear of the gear drive 30 on the crankshaft 46 freely rotating. By operating the clutch 22, therefore, the power transmission to the crankshaft 46 of the compressor can be interrupted, while at the connecting flanges 38, 38 'further driving force in the form of torque can be removed.

FIG. 7 shows a schematic representation of a commercial vehicle with a second embodiment of a compressor system according to the invention. Unlike the in FIG. 1 illustrated embodiment, the driving force for the in FIG. 7 shown compressor system 10 is transmitted directly from the drive 32 to the gear drive 30. A drive train, for example in the form of a wave, can be omitted. At the in FIG. 7 illustrated embodiment, for example, a gear of the drive 32 directly engage in a gear of the gear drive 30 and thus supply the compressor system 10 with drive energy.

FIG. 8 shows a schematic representation of a commercial vehicle with a third embodiment of a compressor system according to the invention. In the FIG. 8 illustrated embodiment of the compressor system 10 is based on the already in FIG. 6 described power transmission path. Via a drive 30 and a drive train 16, drive energy is introduced into a gear drive 30, wherein a not explicitly illustrated gear of the gear drive 30 is supported by a bushing 40. The force introduced into the gear drive 30 is transmitted via a shaft 42 to a further gear drive 44 and supplied from there via a coupling 22 to a compressor 12. The crankshaft of the compressor 12 is mounted on the side facing away from the coupling 22 by a sleeve 40 '. In contrast to FIG. 6 In this embodiment, the sleeve 40 'is provided, which is arranged spatially spaced from the sleeve 40. On the other gear drive 44, a connecting flange 38 and a further connecting flange 38 'are furthermore provided, to which a hydraulic pump 14 and a pump 14' can be connected. The pump 14 'stands symbolically for any of the Drive motor 18 to be driven auxiliary unit, for example, a coolant pump.

FIG. 9 shows a schematic representation of a commercial vehicle with a fourth embodiment of a compressor system according to the invention. In the FIG. 9 illustrated embodiment differs from the in FIG. 8 illustrated embodiment in the way how torque is introduced into the compressor system 10. Analogous to the in FIG. 7 torque is transferred directly from the drive 32 to the gear drive 30, wherein an intermediate shaft is omitted.

FIG. 10 shows a second embodiment of a power transmission path in a compressor system according to the invention. The illustrated power transmission path differs from that FIG. 3 mentioned embodiment in particular in that the gear drive 30 comprises three gears and the drive train 16 and the crankshaft 46 are not coupled together to a single gear of the gear drive 30. In this way, the speed of the compressor and the power take-off 24 in the design of the gear drive 30 can be varied within wide ranges.

FIG. 11 shows a second external view of a compressor system according to the invention. The illustrated compressor system 10 is different from that FIG. 2 known compressor system 10 in particular by the mounting position of a in FIG. 11 ancillaries, not shown, for example, a hydraulic pump. The accessory is mounted on the port flange 38 so as to occupy a position between a cylinder head 48 of the compressor and the port flange 38 on the gear train inside the housing 26.

FIG. 12 shows a third embodiment of a power transmission path in a compressor system according to the invention. The illustrated Kraftübertragungsweg differs from the embodiment known from Figure by the use of a belt drive 50 with a belt 52 and an additional tensioning wheel, the function of the FIG. 6 known further wheel drive takes over. On the representation of connecting flanges for the connection of ancillary units was omitted for better clarity. Analogous to FIG. 6 However, appropriate connection options are foreseeable.

FIG. 13 shows a fourth embodiment of a power transmission path in a compressor system according to the invention. Instead of the FIG. 12 known belt drive 50 is in FIG. 13 a chain drive 54 is used with a chain 56 and an additional tensioning wheel. Analogous to FIG. 12 Here are also possible connections for ancillaries.

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential to the realization of the invention both individually and in any combination.

LIST OF REFERENCE NUMBERS

10

compressor system

12

compressor

14

hydraulic pump

14 '

pump

16

powertrain

18

drive motor

20

commercial vehicle

22

clutch

24

PTO

26

casing

28

drive train

30

gear drive

32

shoot

34

connection port

36

Clutch control terminal

38

flange

38 '

additional connection flange

40

Rifle

40 '

another socket

42

wave

44

another wheel drive

46

crankshaft

48

cylinder head

50

belt drive

52

belt

54

chain drive

56

Chain

Claims (8)

1. Compressor system (10) for supplying a commercial vehicle (20) with compressed air, the system comprising a compressor (12), a clutch (22) and a hydraulic pump (14), wherein the compressor system (10) can be driven by the engine (18) of the commercial vehicle (20) via a drive train (16) and wherein the compressor (12) can be completely decoupled from the engine (18) by the clutch (22), wherein the drive train (16) comprises a gear drive (30) via which the hydraulic pump (14) can be driven and wherein the clutch (22) is arranged between the gear drive (30) and the compressor (12), characterised in that the gear drive (30) provides different speeds for driving the compressor (12) and the hydraulic pump (14) at two separate power takeoffs.
2. Compressor system (10) according to claim 1, characterised in that the compressor (12) and the hydraulic pump (14) are integrated in a common housing (26).
3. Compressor system (10) according to claim 1 or 2, characterised in that the compressor system (10) comprises a further drive (44, 50, 54) on that side of the compressor (12) which faces away from the gear drive (30).
4. Compressor system (10) according to any of the preceding claims, characterised in that

   - the gear drive (30) is bearing-mounted partially by means of a bush (40), and

   - the bush (40) simultaneously serves to bearing-mount a crankshaft (46) of the compressor (12).
5. Compressor system (10) according to any of the preceding claims, characterised in that the gear drive (30) and the crankshaft (46) are coupled to one another in a freely rotatable manner by means of the bush (40).
6. Method for operating a compressor system (10) for supplying a commercial vehicle (20) with compressed air, the system comprising a compressor (12), a clutch (22) and a hydraulic pump (14), wherein the compressor system (10) is driven by the engine (18) of the commercial vehicle (20) via a drive train (16) and wherein the compressor (12) is completely decoupled from the engine (18) by the clutch (22), and wherein the hydraulic pump (14) is driven by the drive train (16) via a gear drive (30), and wherein the drive train (16) is separated between the gear drive (30) and the compressor (12) in order to decouple the compressor (12) from the engine (18), characterised in that different speeds for driving the compressor (12) and the hydraulic pump (14) are provided at two separate power takeoffs.
7. Method according to claim 6, characterised in that the compressor (12) and the hydraulic pump (14) are integrated in a common housing (26).
8. Method according to claim 6 or 7, characterised in that a further drive (44, 50, 54) is provided downstream of the gear drive (30) as viewed from the drive train (16).

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