EP4111039A1 - Verfahren zur montage eines nockenwellenantriebs - Google Patents
Verfahren zur montage eines nockenwellenantriebsInfo
- Publication number
- EP4111039A1 EP4111039A1 EP21708606.5A EP21708606A EP4111039A1 EP 4111039 A1 EP4111039 A1 EP 4111039A1 EP 21708606 A EP21708606 A EP 21708606A EP 4111039 A1 EP4111039 A1 EP 4111039A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- camshaft drive
- drive
- drive train
- tensioning device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 238000013016 damping Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/022—Chain drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L2001/028—Pre-assembled timing arrangement, e.g. located in a cassette
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
- F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution
Definitions
- the disclosure relates to a method for assembling a camshaft drive, in particular a chain camshaft drive with a drive train.
- the drive train can in principle be a toothed belt or a camshaft, but the exemplary embodiments described below relate to camshaft drives with a timing chain.
- the disclosure relates to a method for assembling a camshaft drive that has an intake camshaft and an exhaust camshaft. In these camshaft drives, the timing chain runs in a V-shape from one crankshaft sprocket to two camshaft drive sprockets.
- the German patent application DE 36 36 918 A1 relates to a chain tensioner for an internal combustion engine.
- a damping piston guided in a housing is acted upon axially by a spring in the chain tensioning direction.
- the damping piston can be locked in the housing by means of a mounting ring.
- the mounting ring is snapped into a groove of the damping piston provided with a bevel and a locking surface.
- the mounting ring reaches the locking surface. It engages in a groove in the housing and blocks the movement of the damping piston.
- crankshaft gears cannot be fixed because the drive train can move relative to the crankshaft gear. This can lead to a timing error, the crankshaft gear can also spin when screwing to the crankshaft, which is sometimes not noticeable during assembly and can lead to engine damage when the internal combustion engine is started up.
- a method is to be specified which enables the assembly of a camshaft drive without a tool for unlocking the tensioning device.
- a method for assembling a camshaft drive of an internal combustion engine comprising the steps: i. Provision of the preassembled on a base plate camshaft drive with a drive train which rests positively on a first camshaft drive gear, a second camshaft drive gear and a crankshaft gear, the base plate furthermore having a tensioning device, which from an assembly position in which it does not load the drive train into a tensioning position, in which it keeps the drive train under tension, can be brought, ii. rotationally fixed blocking of the second camshaft drive wheel and the crankshaft wheel, iii.
- Generic drive trains such as toothed belts and timing chains can be preassembled as a unit, formed from a camshaft drive wheel for the inlet camshaft and a camshaft drive wheel for the outlet camshaft and a crankshaft wheel.
- This unit formed from a camshaft drive gear for the intake camshaft and a camshaft drive gear for the exhaust camshaft and a crankshaft gear, is preassembled on a base plate.
- the base plate makes it easier to insert the unit into the corresponding position on the face of the internal combustion engine.
- the base plate with the clamping device configured in this way can be installed in internal combustion engines in which the clamping device is no longer accessible at all after the base plate has been installed in the internal combustion engine.
- the tensioning device is activated or released by pressing it once in a direction opposite to the later tensioning direction until an unlocking device with a latching hook or the like is released. As mentioned, this clamping device is no longer accessible in the state after the base plate has been inserted into the internal combustion engine.
- the unlocking device holding the tensioning device is released solely by applying a force against a later effective direction, a moment with which the first camshaft gear is rotated in the first direction of rotation is selected so high that the tensioning device is correspondingly tightened by tightening the drive train applies the force to release the tensioning device, the tensioning device in the released state acting in an effective direction against the force on the drive train and thus tensioning it.
- a base plate with a preassembled camshaft drive and with a drive train is specified to carry out the method.
- the drive train rests positively on a first camshaft drive gear, a second camshaft drive gear and a crankshaft gear.
- the base plate also has the tensioning device, which can be brought from an assembly position in which it does not load the drive train into a tensioning position in which it keeps the drive train under tension.
- the clamping device is released (unlocked) solely by applying a force against a later effective direction. For this purpose, a torque can be applied to the first camshaft drive wheel which, by tightening the drive train, applies the force to unlock an unlocking device holding the tensioning device in the assembly position.
- the base plate with a preassembled camshaft drive can thus be used on an internal combustion engine which has an assembly position to which the base plate can only be attached if a clamping device arranged on the base plate is pivoted into an assembly position and locked in this, i. wherein the tensioning device in the assembly position does not exert any tensioning force on the drive train and wherein ii. for transferring the tensioning device from the assembly position to an operational position in which an unlocking device holding the tensioning device is unlocked and in which the tensioning device presses on the drive train in one effective direction and thus tensions it, iii. a force is to be applied against the later effective direction, iv. where the force can also be applied, due to the lack of accessibility of the tensioning device at the assembly position, by tension in the drive train, caused by a rotation of a camshaft drive gear relative to a crankshaft gear.
- FIG. 1 A schematically, a camshaft drive with a V-shaped control drive in a basic position
- FIG. 1B schematically, the camshaft drive from FIG. 1A with a section of a drive train located between a first and a second camshaft drive wheel, which section sags because the first camshaft drive wheel is rotated clockwise;
- FIG. 1C shows the camshaft drive from Figures 1A and 1B in a third position in which the first camshaft drive wheel is rotated counterclockwise so that the section located between the first and second camshaft drive wheels comes into contact with a slide rail and the drive train is tensioned; and
- FIG. 2 schematically shows, in six steps, a method for assembling a camshaft drive for an internal combustion engine.
- a drive train 41 is shown schematically in FIGS. 1A to 1C.
- the drive train 41 is part of a camshaft drive 40.
- the drive train 41 is designed to transmit a rotary movement with a constant transmission ratio between a crankshaft gear 30 and a first camshaft drive gear 10 and a second camshaft drive gear 20.
- the transmission ratio is 1 to 2, which means that a complete 360 ° rotation of the crankshaft gear 30 is half a 180 °
- the drive train 41 is a timing chain which is kept under tension via a tensioning rail 44.
- the drive train 41 actuates camshafts 11 and 12 of an internal combustion engine 60, which is only indicated schematically.
- the camshaft drive 40 is mounted on a base plate 45 so that the entire unit consisting of the first camshaft drive gear 10, the second camshaft drive gear 20 and the crankshaft gear 30 with the drive train 41 wrapping around this V-shaped and the tensioning rail 44 at a corresponding mounting position 61 on the internal combustion engine 60 can be attached.
- the attachment is only successful if a tensioning device 43 for pretensioning the drive train 41 is in an assembly position 46. In the later clamping position 47, the clamping device 43 is no longer accessible or the drive train 41 can no longer be blocked with wedges.
- FIGS. 1A to 1C show three basic positions in which the camshaft drive 40 is located during assembly in the internal combustion engine 60.
- the base plate 45 has a preassembled camshaft drive 40 and with a drive train 41 which is positively connected to a first camshaft drive wheel 10, a second camshaft drive wheel 20 and a crankshaft gear 30 is applied.
- the base plate 45 also has the said tensioning device 43, which can be brought from an assembly position 46 in which it does not load the drive train 41 into a tensioning position 47 in which it holds the drive train 41 under tension. In this case, the tensioning device 43 is released solely by applying a force F counter to a later effective direction 48 (spring force of the tensioning device 43).
- a torque M51 can be applied to the first camshaft drive wheel 10 via a torque wrench (not shown) which, by tightening the drive train 41, applies the force F to unlock an unlocking device 49 holding the tensioning device 43 in the assembly position 46.
- a torque wrench (not shown) which, by tightening the drive train 41, applies the force F to unlock an unlocking device 49 holding the tensioning device 43 in the assembly position 46.
- FIG. 1B The section 42 of the drive train 41 is shown sagging, the drive train 41 is stretched between the crankshaft gear 30 and the first camshaft drive gear 10.
- first and the second camshaft drive wheel 10, 20 can be moved and also fixed, usually by means of screws.
- the corresponding screws, not shown, are still accessible for tools.
- Sections of the drive train 41 are also still accessible in order to hold them in place if necessary.
- Figure 1A shows a base plate 45 with a preassembled camshaft drive 40 on an internal combustion engine 60, which has an assembly position 61 to which the base plate 45 can only be attached if a clamping device 43 arranged on the base plate 45 is pivoted into an assembly position 46 and locked in this is.
- the tensioning device 43 does not exert any tensioning force on the drive train 41 in the assembly position 46.
- a force F is required to apply according to Figure 1B.
- the force F is to be applied against the later effective direction 48. Provision is now made for the force F, in the absence of accessibility of the tensioning device 43 at the assembly position 61, to also be applied by tensile stress in the drive train 41, caused by a rotation of a camshaft drive gear 10 with respect to a crankshaft gear 30.
- a method according to FIG. 2 can thus be used, in which, in a first step 101, a camshaft drive 40 preassembled on a base plate 45 is provided.
- This has a drive train 41, which is positively connected to a first Camshaft drive gear 10, a second camshaft drive gear 20 and a crankshaft gear 30.
- the base plate 45 also has a tensioning device 43 which can be brought from an assembly position 46 in which it does not load the drive train 41 into a tensioning position 47 in which it holds the drive train 41 under tension.
- the tensioning device 43 holds the drive train under tension with a spring (not shown).
- the force F must therefore overcome the tension force exerted by the spring (in the direction of action 48, see FIG. 1C).
- a second step 103 the second camshaft drive gear 10 and the crankshaft gear 30 are locked in a rotationally fixed manner.
- the locking occurs by means of wedges or even only by holding the gears 10, 20, 30 in place.
- a third step 103 the first camshaft drive wheel 10 is rotated in a first direction of rotation 51, in which a section 42 of the drive train 41 located between the first camshaft drive wheel 10 and the second camshaft drive wheel 20 is loosened and the drive train 41 comes into contact with a tensioning device 43 .
- the first direction of rotation 51 is clockwise in the view shown.
- the section 42 then sags, the remaining sections between the crankshaft gear 30 and the first camshaft drive gear 10 and between the crankshaft gear 30 and the second camshaft drive gear 20 are tensioned.
- the torque is applied with a tool, in particular a torque wrench.
- step 104 a tensioning device 43, which is provided between the crankshaft gear 30 and the first camshaft drive gear 10 and acts on the drive train 41, is released. The release takes place by unlocking the unlocking device 49.
- step 105 the first camshaft drive wheel 10 is rotated in a second direction of rotation 52 opposite to the first direction of rotation 51, so that the tensioning device 43 tensions the drive train 41. Again, this is preferably done with the torque wrench.
- the first camshaft drive gear 10 is fixed with a first camshaft 11, the second camshaft drive gear 20 with a second camshaft 21 and the crankshaft gear 30 with a crankshaft 31. It is fixed by means of screws (not shown) which penetrate the wheels 10, 20 and 30 and hold them on the shafts 11, 21, 31 with a friction fit.
- the unlocking device 49 is released solely by applying a force F against a later effective direction 48.
- a moment M51 with which the first camshaft gear 10 is rotated in the first direction of rotation 51 (see Figure 1B) is selected so high that the tensioning device 43 correspondingly, by tightening the drive train 41, the force F for unlocking the unlocking device 49 against the spring force the clamping device 43 applies.
- the tensioning device 43 acts in the released state in an effective direction 48 against the force F acts on the drive train 41 and thus tensions it.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020202445.6A DE102020202445A1 (de) | 2020-02-26 | 2020-02-26 | Verfahren zur Montage eines Nockenwellenantriebs |
| PCT/EP2021/054646 WO2021170701A1 (de) | 2020-02-26 | 2021-02-25 | Verfahren zur montage eines nockenwellenantriebs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4111039A1 true EP4111039A1 (de) | 2023-01-04 |
Family
ID=74797922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21708606.5A Withdrawn EP4111039A1 (de) | 2020-02-26 | 2021-02-25 | Verfahren zur montage eines nockenwellenantriebs |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4111039A1 (de) |
| DE (1) | DE102020202445A1 (de) |
| WO (1) | WO2021170701A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3636918A1 (de) | 1986-10-30 | 1988-05-05 | Schaeffler Waelzlager Kg | Kettenspanner |
| US5601505A (en) * | 1994-09-12 | 1997-02-11 | Borg-Warner Automotive, K.K. | Hydraulic tensioner |
| GB2347174B (en) | 1999-02-23 | 2002-10-30 | Rover Group | A flexible drive assembly |
| JP4118173B2 (ja) | 2003-03-18 | 2008-07-16 | 株式会社椿本チエイン | 組立部品保持パネル |
| DE102012001074B4 (de) | 2012-01-20 | 2021-09-23 | Iwis Motorsysteme Gmbh & Co. Kg | Spannvorrichtung mit einem einen Rampenbereich aufweisenden Entriegelungselement |
| US20190048764A1 (en) * | 2017-08-10 | 2019-02-14 | GM Global Technology Operations LLC | Timing drive tensioner assembly with pre-load and method |
| DE102018117985A1 (de) * | 2018-07-25 | 2020-01-30 | Schaeffler Technologies AG & Co. KG | Transportfähiges Zugmitteltriebsystem für eine Brennkraftmaschine |
-
2020
- 2020-02-26 DE DE102020202445.6A patent/DE102020202445A1/de active Pending
-
2021
- 2021-02-25 EP EP21708606.5A patent/EP4111039A1/de not_active Withdrawn
- 2021-02-25 WO PCT/EP2021/054646 patent/WO2021170701A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN115176072A (zh) | 2022-10-11 |
| WO2021170701A1 (de) | 2021-09-02 |
| DE102020202445A1 (de) | 2021-08-26 |
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Legal Events
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| DAX | Request for extension of the european patent (deleted) | ||
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