DE102014201726A1 - Device and method for starting an internal combustion engine - Google Patents

Abstract

The invention relates to a device for starting an internal combustion engine by means of a preferably electric starter motor with a starter pinion, which is engageable to start the internal combustion engine with a ring gear of a dual mass flywheel. The invention is characterized in that the device comprises a first gear stage between a primary flywheel of the dual mass flywheel and the starter motor and a second gear stage between a secondary flywheel of the dual mass flywheel and the starter motor.

Description

The invention relates to a device for starting an internal combustion engine by means of a preferably electric starter motor with a starter pinion, which is engageable to start the internal combustion engine with a ring gear of a dual mass flywheel. The invention further relates to a drive train of a motor vehicle with such a device. The invention further relates to a method for starting an internal combustion engine with such a device.

From the German patent application DE 197 29 421 A1 a flywheel assembly having a first flywheel and a second flywheel is known, wherein at a certain relative rotation between the first and the second flywheel, a lever mechanism on a part of the second flywheel so engages that a further rotation between the first and the second flywheel is prevented , From the German patent application DE 10 2011 117 395 A1 is known a dual-mass flywheel with a multi-part primary flywheel comprising a connectable to a starter first disc and a second disc wheel, wherein between the first disc and the second disc wheel, a locking mechanism is arranged, which at a threshold speed of an open state without adhesion between the first Disc wheel and the second disc wheel in a locked state with adhesion between the first disc wheel and the second disc wheel changes. From the German patent application DE 10 2010 012 514 A1 A1 is a device for starting an internal combustion engine by means of a preferably electric starter motor is known, the pinion with a arranged on a Flanschrad ring gear is constantly engaged, wherein between a hub of the Flanschrades and a power output shaft of the internal combustion engine only in the drive direction of the starter motor torque transmitting freewheel is provided, wherein the flange is arranged with the freewheel between at least one output flange on the power output shaft and a drivingly connected to the output flange coupling element of a downstream speed change gear.

The object of the invention is to further simplify and / or improve the starting of an internal combustion engine by means of a preferably electric starter motor with a starter pinion which can be brought into engagement with a ring gear of a dual mass flywheel to start the internal combustion engine.

The object is in a device for starting an internal combustion engine by means of a preferably electric starter motor with a starter pinion, which is engageable to start the internal combustion engine with a ring gear of a dual mass flywheel, achieved in that the device comprises a first gear stage between a primary flywheel of the dual mass flywheel and the starter motor and a second gear stage between a secondary flywheel of the dual mass flywheel and the starter motor comprises. As a result, resonant vibrations between the primary flywheel and the secondary flywheel of the dual mass flywheel can be reduced, in particular prevented, in a simple manner, particularly advantageously without having to design a toothing of the starter generator for maximum torque of the internal combustion engine.

A preferred embodiment of the device is characterized in that the first gear stage on the primary flywheel having a first sprocket, which is engageable with a first starter pinion engageable, and in that the second gear stage on the secondary flywheel comprises a second sprocket, with a second starter pinion can be brought into engagement. In the apparatus according to the invention, the two starter pinions are not permanently engaged with the sprockets of the dual mass flywheel. The starter pinions are brought into engagement only with the sprockets of the dual mass flywheel when starting the internal combustion engine. This provides the advantage that the teeth do not have to be designed for the maximum torque of the internal combustion engine.

A further preferred embodiment of the device is characterized in that the two sprockets and the two starter pinions each have the same diameter. This is achieved in a simple manner that the two gear stages have the same translation.

A further preferred embodiment of the device is characterized in that the first starter pinion with a first freewheel and the second starter pinion are combined with a second freewheel. The freewheels are designed so that they transmit torque only in the drive direction of the starter motor. The freewheels are advantageously arranged so that both the primary flywheel and the secondary flywheel of the dual mass flywheel can independently overtake the starter motor.

A further preferred embodiment of the device is characterized in that that the first gear stage is coupled to the second gear stage so that both flywheel masses for starting the internal combustion engine are simultaneously drivingly connected to the starter motor. The starter pinions can be axially displaceable, for example, on a shaft or a shaft section relative to the respective freewheel. The freewheels can also be combined with the starter pinions in a common package, which is axially displaceable on a shaft or a shaft portion.

A further preferred embodiment of the device is characterized in that the two gear stages are arranged on a continuous drive shaft of the starter motor. The coupling of the starter pinion with the freewheels and / or the gear stages with each other can be done for example by hollow shafts or hollow shaft sections.

The invention further relates to a starter motor for a device described above. The starter motor with the two starter pinions and possibly with the two freewheels can be traded separately.

The invention further relates to a dual mass flywheel for a previously described device. The dual-mass flywheel with the two sprockets can be traded separately.

The invention further relates to a drive train of a motor vehicle with a device described above. The inventive device is made possible in a simple manner that the starter motor in addition to the primary flywheel also drives the secondary flywheel when starting the engine. Advantageously, both the primary flywheel and the secondary flywheel are coupled via their own freewheel with the starter motor.

In a method for starting an internal combustion engine with a device described above, the above-mentioned object is alternatively or additionally achieved in that both flywheel masses of the dual mass flywheel for starting the internal combustion engine via the two gear stages are driven simultaneously.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

1 a simplified representation of a drive train of a motor vehicle with a device according to the invention for starting an internal combustion engine and

2 a detailed excerpt 1 ,

In 1 is a powertrain 1 a motor vehicle with an internal combustion engine 4 and a gearbox 5 shown in simplified form. The transmission 5 is a clutch 6 upstream. A torsional vibration damper 8th is between the internal combustion engine 4 and the clutch 6 connected.

The internal combustion engine 4 is to start over the torsional vibration damper 8th with a starter motor 9 coupled. The starter motor 9 is preferably designed as an electric motor and is also referred to as a starter or starter.

The torsional vibration damper 8th is as a dual mass flywheel 10 with a primary flywheel 11 and a secondary flywheel 12 executed. The torsional vibration damping function of the dual mass flywheel 10 is in 1 symbolically by a spring device 13 and a damper 14 indicated.

One of the objects of the present invention is undesired vibrations between the primary flywheel mass 11 and the secondary flywheel 12 when starting the internal combustion engine 4 , which is also referred to as an internal combustion engine, to reduce or prevent. The unwanted vibrations occur in particular when the internal combustion engine 4 when running up a resonance frequency of the dual mass flywheel 10 passes.

According to one aspect of the invention, the starter motor 9 so extended that the starter motor 9 when starting the internal combustion engine 4 in addition to the primary flywheel 11 also the secondary flywheel 12 drives. For this purpose, on the one hand, the starter motor 9 via a first gear stage 15 and a first freewheel 17 with the primary flywheel 11 coupled. In addition, the starter motor 9 via a second gear stage 16 and a second freewheel 18 with the secondary flywheel 12 coupled.

Here are the freewheels 17 and 18 arranged so that the starter motor or starter 9 the primary flywheel 11 and the secondary flywheel 12 of the dual mass flywheel 10 can drive. In addition, the freewheels 17 and 18 so arranged and executed that both the primary flywheel 11 as well as the secondary flywheel 12 of the dual mass flywheel 10 independently of each other the starter or starter motor 9 can overtake.

In 2 is a section of 1 presented with more details. A dual mass flywheel 20 includes a primary flywheel 21 and a secondary flywheel 22 , At the primary flywheel 21 is a first sprocket 23 appropriate. A second sprocket 24 is at the secondary flywheel 22 appropriate.

The first sprocket 23 is to illustrate a first gear stage with a first starter pinion 25 engageable. The second sprocket 24 is to illustrate a second gear stage with a second starter pinion 26 engageable.

The first starter pinion 25 is a first freewheel 27 assigned. The second starter pinion 26 is a second freewheel 28 assigned. The two freewheels 27 and 28 are left and right of the dual mass flywheel 20 arranged.

The two starter pinions 25 . 26 and the two freewheels 27 and 28 are on a continuous drive shaft 30 a starter motor 29 arranged. The starter motor 29 drives the drive shaft 30 with the interposition of a gearbox 32 at. The gear 32 is designed, for example, as a planetary gear and serves to the drive speed of the starter motor 29 to subordinate or reduce.

In addition, the starter motor 29 with a lever 34 equipped by a pivot bearing 35 is pivotally mounted. An in 2 upper end of the lever 34 is on a coupling rod 33 the starter motor 29 hinged. An in 2 lower end of the lever 34 is with the interposition of a spring device 36 with the first freewheel 27 and the first starter pinion 25 coupled. The first starter pinion 25 is in the axial direction with the second starter pinion 26 coupled.

Im in 2 shown state of the two gear stages are the starter pinion 25 and 26 not with the sprockets 23 and 24 engaged. About the lever 34 are the two starter pinions 25 and 26 relative to the dual mass flywheel 20 axially displaceable so that they are with the sprockets 23 and 24 get in touch. The meshing of the gear stages is thereby by the spring means 36 simplified.

When the starter pinions 25 and 26 with the sprockets 23 and 24 can be engaged, then the in 2 not shown internal combustion engine by the starter motor 29 to be started. After starting the engine, the starter pinions 25 and 26 back in their in 2 shown brought state. This will make the dual mass flywheel 20 from the drive shaft 30 the starter motor 29 decoupled.

LIST OF REFERENCE NUMBERS

1

 powertrain

2

3

4

 Internal combustion engine

5

 transmission

6

 clutch

7

8th

 torsional vibration dampers

9

 starter motor

10

 Dual Mass Flywheel

11

 primary flywheel

12

 secondary flywheel

13

 spring means

14

 attenuator

15

 first gear stage

16

 second gear stage

17

 first freewheel

18

 second freewheel

19

20

 Dual Mass Flywheel

21

 primary flywheel

22

 secondary flywheel

23

 first sprocket

24

 second sprocket

25

 first starter pinion

26

 second starter pinion

27

 first freewheel

28

 second freewheel

29

 starter motor

30

 drive shaft

31

32

 transmission

33

 coupling rod

34

 lever

35

 pivot bearing

36

 spring means

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 19729421 A1 [0002]
• DE 102011117395 A1 [0002]
• DE 102010012514 A1 [0002]

Claims (10)

Device for starting an internal combustion engine ( 4 ) by means of a preferably electric starter motor ( 9 ; 29 ) with a starter pinion for starting the internal combustion engine ( 4 ) with a sprocket of a dual-mass flywheel ( 10 ; 20 ) is engageable, characterized in that the device comprises a first gear stage ( 15 ) between a primary flywheel ( 11 ) of the dual mass flywheel ( 10 ; 20 ) and the starter motor ( 9 ) and a second gear stage ( 16 ) between a secondary flywheel ( 12 ; 22 ) of the dual mass flywheel ( 10 ; 20 ) and the starter motor ( 9 ). Apparatus according to claim 1, characterized in that the first gear stage ( 15 ) on the primary flywheel ( 11 ) a first sprocket ( 23 ) provided with a first starter pinion ( 25 ) is engageable, and in that the second gear stage ( 16 ) on the secondary flywheel ( 12 ) a second sprocket ( 24 ) equipped with a second starter pinion ( 26 ) is engageable. Apparatus according to claim 2, characterized in that the two sprockets ( 23 . 24 ) and the two starter pinions ( 25 . 26 ) each have the same diameter. Apparatus according to claim 2 or 3, characterized in that the first starter pinion ( 25 ) with a first freewheel ( 17 ; 27 ) and the second starter pinion ( 26 ) with a second freewheel ( 18 ; 28 ) are combined. Device according to one of the preceding claims, characterized in that the first gear stage ( 15 ) so with the second gear stage ( 16 ) is coupled, that both flywheel masses for starting the internal combustion engine ( 4 ) simultaneously drivingly with the starter motor ( 9 ; 29 ) are connectable. Device according to one of the preceding claims, characterized in that the two gear stages ( 15 . 16 ) on a continuous drive shaft ( 30 ) of the starter motor ( 9 ; 29 ) are arranged. Starter motor for a device according to one of the preceding claims. Dual mass flywheel for a device according to one of claims 1 to 6. Drive train of a motor vehicle with a device according to one of claims 1 to 6. Method for starting an internal combustion engine with a device according to one of Claims 1 to 6, characterized in that both flywheel masses ( 11 . 12 ) of the dual mass flywheel ( 10 ) for starting the internal combustion engine ( 4 ) over the two gear stages ( 15 . 16 ) are driven simultaneously.

Images