DE102017103695A1 - Drive device with superposition gear - Google Patents

Abstract

Drive device comprising a superposition gear (18) with a planetary gear (6) and a housing (8), a main drive machine (1) which is connected to an input shaft (4) of the superposition gearing, two auxiliary drives (3.1,3.2), each having a Drive connection (9.1,10.1,20.1,9.2,10.2,20.2) are connected to the planetary gear (6), an output shaft (11) of the superposition gear, which can be connected to a working machine (2), wherein the planetary gear (6) is a ring gear (6.1), a sun gear (6.2), a planet carrier (7) and a plurality of planetary gears (6.3), wherein the first and the second auxiliary drive (3.1,3.2) are arranged at different heights in the z direction and wherein an output shaft (5 ) of the planetary gear (6) is present, which is connected via a spur gear (12) with the output shaft (11) such that an axial offset between the input shaft (4) and output shaft (11) is present.

Description

The invention relates to a drive device comprising a superposition gear with a planetary gear and a housing, a main drive machine which is connected to an input shaft of the superposition gearing, two auxiliary drives, which are each connected via a drive connection with the planetary gear, an output shaft of the superposition gearing, which with a work machine can be connected, wherein the planetary gear has a ring gear, a sun gear, a planetary carrier and a plurality of planetary gears.

In a superposition gear generally at least two shafts of the planetary gear are driven by mutually independent drives so that the speeds at a further shaft, the output shaft, are added or subtracted. If one of the drives can be regulated, then a stepless speed control for the output shaft can be achieved. In the present case, two shafts are driven, with one shaft being driven by the main drive machine and the second shaft being driven by the two speed-controllable auxiliary drives. On the third wave of the output shaft, a working machine is connected.

From the prior art drive devices with a superposition gear are known in which a main drive machine via the input shaft, the ring gear of a planetary gear and a controllable auxiliary drive via a gear stage drives the planet carrier, while the machine is connected via the output shaft to the sun. By such a drive device, the speed can be adjusted continuously to the output shaft in a fairly wide speed range and the constant-running main drive machine.

Furthermore, it is possible to tow the main drive machine load-free, by the auxiliary drive during startup each imprinting the speed of the main drive machine. Only when the main drive machine is near the rated speed and can thus apply a high torque, the load is slowly accelerated by the compensation of the speed is reduced by the PTO.

A concrete version with two power take-offs is for example in the Scriptures DE 102015107934 A1 shown. Here, as in such devices with planetary gearbox has been customary, the drive shaft of the main drive machine is axially aligned with the output shaft.

Such drive devices are used in particular for driving pumps, compressors or compressors with high performance, as used for example in the oil and gas industry or in thermal power plants.

However, these drive devices have the disadvantage that they require a relatively large amount of space. This is not so bad for new systems, since this space can be planned in the system. On the other hand, it is particularly problematic in the modernization of existing systems in which, for example, a transmission control clutch for the speed control is to be replaced. Here is the available space specified and in many cases is not sufficient to accommodate such a drive device.

The object of the invention is now to find an improved solution, so that said drive device can be designed to save space. In particular, for the retrofitting in existing systems an efficiency-improving speed control with optimal utilization and flexibility in terms of space to be created.

The object is achieved by a drive device according to claim 1. Further advantageous features of the embodiment according to the invention, which additionally improve the device, can be found in the corresponding subclaims. The drive device according to the invention is designed so that to the output shaft of the planetary gear, a spur gear is connected, via which the superposition gear is connected to the output shaft such that an axial offset between the input shaft and output shaft is present. Due to the axial offset, it is possible that one of the auxiliary drives lower and thus the first and the second power take-off are arranged at different heights in the z-direction. Although an additional gear stage is provided, it has been found that you can get by with significantly less space and that there is a much greater flexibility for the adaptation to existing geometric boundary conditions.

In addition, it is advantageous for the center of gravity of the device when one of the auxiliary drives is arranged lower. And furthermore, the device according to the invention offers much more flexibility in the position of the input and output shafts, since now also transmission control clutches with axial offset can be replaced without complex modifications in the periphery. Other geometric boundary conditions in such so-called retrofit applications can be more easily met.

In particular, it is preferred if the main drive machine can only be operated with constant speed and the auxiliary drives can be operated with speed control. Especially with large drive power, this allows a more cost-effective implementation. Much of the drive power can be applied by the constantly operating main drive machine. This does not require a frequency converter, which saves investment costs. Preferably, the main drive machine is designed as a medium-voltage motor, ie with a voltage of more than 1 kV. The speed control takes place via the auxiliary drives, which require less power and which are preferably designed as low-voltage motors with a voltage of less than 1 kV. Thus, the required frequency converters are smaller and less expensive.

Furthermore, it is advantageous to connect the input shaft with the ring gear, the output shaft with the sun gear and the auxiliary drives via a respective drive connection with constant translation with the planet carrier. Such a running device is particularly well suited for high speeds at the output, as required for example in high-speed compressors or large fans.

In particular, it is advantageous if the two auxiliary drives are each coupled via a Nebenantriebsrad and in each case via an intermediate shaft with stepped intermediate wheels to the planetary gear. This allows a particularly flexible space design that can meet a variety of geometric constraints. This is an important criterion for existing plants.

Further space savings is possible in the length of the drive device when the two auxiliary drives are arranged so that they lie in the plan view from the z-direction predominantly or completely within the housing outline. This piggyback design can nevertheless be modernized in very narrow systems, since this variant is particularly compact.

Preferably, the two auxiliary drives are located on the side of the main drive machine. The advantage is that on the output side in the area of the machine no further space for the drive device is needed.

Alternatively, the two auxiliary drives may be arranged on the side of the output shaft, ie the working machine, if, for example, no suitable installation space is available on the side of the main drive machine.

To simplify installation and maintenance, it is advantageous if the housing is designed to be separable by a parting line and has a housing cover and a housing lower part. Furthermore, the two auxiliary drives can be arranged directly on the housing cover, wherein the superposition gear and the parting line are designed such that the housing cover can be dismantled with the two auxiliary drives, while the lower housing part with main drive machine, planetary gear and output shaft can remain installed. This simplifies assembly and disassembly even more.

In order to enable an emergency operation or a controlled shutdown in the case of a failed main drive machine, a further drive connection can be provided for each auxiliary drive and connects the respective auxiliary drive to the input shaft of the drive device. Wherein in each case a clutch is provided in these additional drive connections, which can disconnect or couple the drive connection. And wherein these additional drive connections have a constant translation. As a result, much of the energy for braking down can be consumed by re-acceleration in the power take-offs. An inadmissible overspeed of the planet carrier is thus prevented. The fact that two clutches are present, they can be designed smaller and cheaper, without them in the case of use, there is a risk of overloading.

Furthermore, the device designed for small output speeds can be started or operated alone with the auxiliary drives.

Particularly preferably, the respective additional drive connection is made by a Nebenantriebsrad via an intermediate shaft with two intermediate wheels or a stepped intermediate gear on a spur gear on the intermediate shaft and via this on a spur gear on the input shaft. The clutch is preferably arranged in this version on the intermediate shaft and can disengage or engage the spur gear on the intermediate shaft.

In another preferred embodiment, the respective additional drive connection via a secondary wheel, which is arranged on a secondary drive shaft, and act via an independently mounted spur gear on a spur gear on the input shaft. The clutch is in this case arranged on the PTO shaft and disengages the auxiliary wheel or a.

• 1 erfindungsgemäße Antriebsvorrichtung in Draufsicht
• 2 erfindungsgemäße Antriebsvorrichtung in Frontansicht
• 3 weitere erfindungsgemäße Antriebsvorrichtung in Draufsicht
• 4-5 noch weitere erfindungsgemäße Antriebsvorrichtungen mit Anordnung der Nebenantriebe auf Seite der Ausgangswelle
• 6-7 noch weitere erfindungsgemäße Antriebsvorrichtungen mit jeweils weiterer Triebverbindung zwischen Nebenantrieb und Eingangswelle

By way of embodiments, further advantageous embodiments of the invention will be explained with reference to the drawings. The features mentioned can be advantageously implemented not only in the illustrated combination, but also individually combined with each other. The figures show in detail:

• 1 Drive device according to the invention in plan view
• 2 Drive device according to the invention in front view
• 3 further drive device according to the invention in plan view
• 4-5 Still further drive devices according to the invention with arrangement of the auxiliary drives on the output shaft side
• 6-7 Still further drive devices according to the invention, each with further drive connection between the auxiliary drive and the input shaft

The figures are described in more detail below. Like reference numerals designate the same or analogous components or components.

In 1 a drive device according to the invention is shown, via the output shaft 11 to the work machine 2 is connected. The work machine 2 may be, for example, a pump, a compressor, a fan or a blower. It may also be a conveyor belt drive or a mill or similar machine. In particular, a work machine 2 with high performance, where it is particularly important to have a drive with high efficiency. Due to the size of the drive, it is also crucial that the required space is not too large.

The existing in the drive device superposition gear 18 has a housing 8th on and includes a planetary gear 6 , as well as a spur gear stage 12 , which is formed by two spur gears and the output shaft 5 of the planetary gear with the output shaft 11 the drive device connects. Through the spur gear 12 can be an axial offset between the input shaft 4 and the output shaft 11 be executed very flexible depending on the requirement. The axial offset can be present not only in the x-direction, but also in limits in the z-direction. Thus, the drive device can be adapted well to existing conditions, for example when retrofitting in existing systems.

The input shaft 4 connects the main drive machine 1 with the ring gear 6.1 of the planetary gear and the output shaft 5 is to the sun wheel 6.2 connected. About the planet carrier 7 with several planet wheels 6.3 the drive connection between ring gear takes place 6.1 and sun gear 6.2 ,

In addition, there are two auxiliary drives 3.1 . 3.2 provided, each via a drive connection to the planet carrier 7 are connected. The fact that these are each connected via a separate drive connection, has the advantage that the necessary gear stages and components can then be dimensioned smaller than when both auxiliary drives 3.1 , 3.2 are connected via a common gear stage. The drive connection takes place in this embodiment via a respective Nebenantriebsrad 9.1 , 9.2, which sits on the PTO shaft 13.1,13.2, and via an intermediate shaft 10.1 , 10.2 each with two intermediate wheels, one of which in the external teeth on the planet carrier 7 , which is designed as a large wheel or connected to a large wheel engages. A particularly preferred alternative for the intermediate shaft is that the drive connection via a stepped intermediate 10.1 , 10.2. An advantage of the design of the drive connections described here is that very variable translations are possible and yet many components, in particular the housing parts can be kept the same.

A particular advantage is the flexibility in the spatial arrangement, thereby the space can be very well utilized or the arrangement can be well adapted to existing space shapes. Since very short shafts and relatively small spur gears are used, the design is inexpensive and has a lower weight.

In the embodiment shown are the auxiliary drives 3.1 , 3.2 on the gearbox 8th arranged. And in such a way that the auxiliary drives 3.1 , 3.2 essentially within the outline 8a of the housing in plan view. As a result, a particularly compact variant, in particular with a short length in the y direction, is achieved. In addition, the auxiliary drives 3.1 3.2 placed so that they are on the side of the main propulsion engine 1 are connected.

In the front view in 2 the compactness of the design is easy to recognize. The housing 8th is through a dividing joint 8.3 in a housing cover 8.1 and a housing lower part 8.2 shared. The auxiliary drives 3.1 , 3.2 are both on the housing cover 8.1 This offers advantages in the assembly and also in the construction, since the housing cover 8.1 , with the components stored therein, regardless of the desired axial offset can always be performed identically.

According to the invention, the second auxiliary drive 3.2 positioned lower in the z-direction than the first PTO 3.1 , The first PTO is present on the side to which the axle offset of the output shaft 11 is provided. Due to the axial offset there is enough space to the second PTO 3.2 advantageously lower. In a Another option could be the second PTO 3.2 also on the lower part of the housing 8.2 to be ordered.

Good to recognize in turn are the separate drive connections on the gears 9.1 , 10.1 and 9.2,10.2 between the auxiliary drives 3.1 , 3.2 and designed as a large wheel planet carrier 7 , The other components of the planetary gear 6 and the spur gear stage 12 , as well as the output shaft 11 are not shown.

The front view is valid analogously for the other variants.

3 represents a further embodiment of the drive device according to the invention. In contrast to the in 1 and 2 As shown embodiment, the drive connection between the auxiliary drives 3.1 , 3.2 and the planet carrier 7 in this case via a first or second intermediate wheel 20.1 , 20.2 instead of a stepped idler 10.1 10.2.

In 4 Another embodiment is shown in which the auxiliary drives 3.1 , 3.2 on the side of the output shaft 11 are arranged. Again, according to the invention is a spur gear 12 between the output shaft 5 and the output shaft 11 available to realize a misalignment, and to accommodate the deepening of the second PTO 3.2 to accomplish.

The respective drive connection between the auxiliary drives 3.1 and 3.2 and the planet carrier 7 takes place here via a slightly longer intermediate shaft 10.1 , 10.2 each with two spur gears. Also in this variant, a very compact design is possible. The auxiliary drives 3.1 , 3.2 are in plan view again within the housing outline 8a ,

5 shows an arrangement in which the auxiliary drives 3.1 , 3.2 outside the housing outline 8a are provided. About each longer running PTO shaft 13.1 , 13.2 the drive connection takes place via a smaller auxiliary drive wheel and an intermediate shaft 10.1 , 10.2 with two spur gears on the planet carrier.

6 and 7 show further embodiments of the invention, in which in each case an additional drive connection between the respective auxiliary drive 3.1 , 3.2 and the input shaft 4 is provided. The inventively present spur gear 12 between output shaft 5 and output shaft 11 , which allows a misalignment, is not explicitly shown here for reasons of simplification.

In the additional drive connections are each a clutch 16.1 ., 16.2. As a result, the drive connection for each power take 3.1.3.2 is also available separately, in turn, the clutches and other components can be designed smaller and thus cheaper and space-saving. The additional drive connections between the auxiliary drives 3.1 , 3.2 and the input shaft 4 serve for example to the drive device with stationary main drive machine 1 with the help of auxiliary drives 3.1 , 3.2 to start or operate at low speed or in case of failed main propulsion engine 1 to allow a controlled emergency operation or a controlled shutdown. In both cases, it is necessary that the drive connections can be switched on and off, which in this case via the clutches 16.1 , 16.2, which can be arranged at different positions in the drive connection. When engaged, the power take-offs can replace the main propulsion engine at low speeds or in emergency mode. Depending on requirements, only one auxiliary drive can be engaged.

In 6 is shown a variant in which the clutches 16.1 , 16.2 between the extended intermediate shaft 10.1 , 10.2 and the spur gears 15.1 , 15.2 sit. The spur wheels 15.1 , 15.2 both engage in the spur gear 17 on the input shaft 4 one. The connection of the auxiliary drives 3.1 , 3.2 takes place via extended secondary drive shafts 13.1 , 13.2 and the auxiliary drive wheels 9.1 , 9.2, in the stepped intermediate gears on the respective intermediate shaft 10.1 , 10.2 intervene.

It is particularly advantageous in this embodiment that the clutches 16.1,16.2 are arranged on a free shaft end. This allows a control oil supply for the circuit via an axial bore at this free shaft end. The clever arrangement offset in the y-direction makes the drive device particularly compact despite the additional functionalities.

At the in 7 variant shown sit the clutches 16.1 , 16.2 directly on the respective PTO shaft 13.1 13.2. The attached to the clutch 16.1,16.2 side wheels 14.1 , 14.2 each engage in the intermediate gear 15.1 15.2, which points to the common spur gear 17 on the input shaft 4 Act. The advantage of this design is, inter alia, that no extended intermediate shafts are necessary, but directly via simple spur gears on the input shaft 4 can be acted upon.

Via the various spur gear stages, the gear ratio can be well adapted to the required speeds.

LIST OF REFERENCE NUMBERS

1

Prime mover

2

working machine

3.1, 3.2

first and second PTO

4

input shaft

5

output shaft

6

planetary gear

6.1

ring gear

6.2

sun

6.3

planetary gears

7

planet carrier

8th

casing

8a

Housing outline in plan view

8.1

housing cover

8.2

Housing bottom

8.3

dividing

9.1, 9.2

first and second Nebenantriebsrad

10.1, 10.2

first and second intermediate shaft with intermediate wheels (or first and second stepped intermediate gear)

11

output shaft

12

spur gear

13.1, 13.2

first and second power take-off shaft

14.1, 14.2

first and second auxiliary wheel

15.1, 15.2

first and second spur gear

16.1, 16.2

first and second clutch

17

Spur gear on input shaft

18

Superposition gear

20.1, 20.2

first and second idler

x

width

y

length

z

height direction

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 102015107934 A1 [0005]

Claims (12)

Drive device comprising a superposition gear (18) with a planetary gear (6) and a housing (8), a main drive machine (1) which is connected to an input shaft (4) of the superposition gearing, two auxiliary drives (3.1,3.2), each having a Drive connection (9.1,10.1,20.1,9.2,10.2,20.2) are connected to the planetary gear (6), an output shaft (11) of the superposition gear, which can be connected to a working machine (2), wherein the planetary gear (6) is a ring gear (6.1), a sun gear (6.2), a planet carrier (7) and a plurality of planetary gears (6.3), characterized in that the first and the second auxiliary drive (3.1,3.2) are arranged at different heights in the z-direction and that a Output shaft (5) of the planetary gear (6) is present, which is connected via a spur gear (12) with the output shaft (11) such that an axial offset between the input shaft (4) and output shaft (11) is present. Device after Claim 1 characterized in that the main drive machine (2) is only constant speed operable and the auxiliary drives (3.1,3.2) are speed-controlled operable. Device after Claim 1 or 2 characterized in that the input shaft (4) with the ring gear (6.1), the output shaft (5) with the sun gear (6.2) and the auxiliary drives (3.1,3.2) via a drive connection (9.1,10.1,9.2,10.2) with constant translation are connected to the planet carrier (7). Device according to one of the preceding claims, characterized in that the two auxiliary drives (3.1.3.2) in each case via a PTO (9.1,9.2) and in each case via an intermediate shaft (10.1,10.2), each with two intermediate wheels or via a respective stepped intermediate wheel (10.1. , 10.2) are coupled to the planetary gear (6). Device according to one of the preceding claims, characterized in that the two auxiliary drives (3.1.3.2) in the plan view from z-direction are predominantly or completely within the housing outline (8a). Device according to one of the preceding claims, characterized in that the two auxiliary drives (3.1,3.2) are arranged on the side of the main drive machine (1). Device according to one of Claims 1 to 6 characterized in that the two auxiliary drives (3.1,3.2) are arranged on the side of the output shaft (11). Device according to one of the preceding claims, characterized in that the housing (8) by a parting line (8.3) is designed to be separable and a housing cover (8.1) and a lower housing part (8.2). Device after Claim 8 characterized in that the two auxiliary drives (3.1,3.2) on the housing cover (8.1) are arranged and that the superposition gear (13) and the parting line (8.3) are designed such that the housing cover (8.1) with the two auxiliary drives (3.1,3.2 ), while the lower housing part (8.2) with main drive machine (1), planetary gear (6) and output shaft (5) can remain installed. Device according to one of the preceding claims, characterized in that between the auxiliary drives (3.1,3.2) and the input shaft (4) each have an additional drive connection with constant translation, which are designed so that these each have an existing clutch (16.1,16.2) can be disconnected or connected. Device after Claim 10 characterized in that the respective additional drive connection via a PTO (9.1,9.2), and via an intermediate shaft (10.1,10.2) with two intermediate wheels or with a stepped intermediate gear (10.1,10.2) on a spur gear (15.1,15.2) and on this acting on a common spur gear (17) on the input shaft, wherein the clutch (16.1,16.2) respectively on the intermediate shaft (10.1,10.2) is arranged and the clutch each disengage the spur gear (15.1,15.2) or can engage. Device after Claim 10 characterized in that the respective additional drive connection via a respective secondary wheel (14.1,14.2) on the PTO shaft and a respective spur gear (15.1,15.2) acts on a common spur gear (17) on the input shaft, wherein the clutch (16.1,16.2) respectively is arranged on the PTO shaft and the clutch can disengage or engage each of the secondary wheel (14.1,14.2).

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