US20050115529A1 - Device for adjusting the relative angular position of two rotating elements - Google Patents
Device for adjusting the relative angular position of two rotating elementsDownload PDFInfo
- Publication number
- US20050115529A1 US20050115529A1US11/003,009US300904AUS2005115529A1US 20050115529 A1US20050115529 A1US 20050115529A1US 300904 AUS300904 AUS 300904AUS 2005115529 A1US2005115529 A1US 2005115529A1
- Authority
- US
- United States
- Prior art keywords
- rotor
- actuating
- rotating elements
- drive
- angular position
- 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.)
- Abandoned
Links
- 230000005540biological transmissionEffects0.000claimsabstractdescription15
- 238000002485combustion reactionMethods0.000description9
- 238000005265energy consumptionMethods0.000description3
- 238000001816coolingMethods0.000description1
- 238000010438heat treatmentMethods0.000description1
- 230000010355oscillationEffects0.000description1
- 230000001960triggered effectEffects0.000description1
Images
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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- 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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/3443—Solenoid driven oil control valves
Definitions
- the inventionrelated to a device for adjusting a relative angular position of two rotating elements which are connected to a drive by a transmission element.
- Devices of this typeare used for example in internal combustion engines and are provided there for effecting a relative angular adjustment of the camshaft with respect to the crank-shaft driving the camshaft.
- the adjustments in the kinematics of the valve driveinfluences within limits the phase angle of the valve opening, the opening period and the valve stroke in a variable fashion.
- DE 100 36 375 A1discloses such a device for effecting a relative angular adjustment between a camshaft and a crank-shaft of an internal combustion engine.
- a chain wheelis mounted on the camshaft so as to be driven by the crankshaft, the chain wheel driving the camshaft via a transmission element.
- the transmission elementmakes it possible to change the relative angular position of the two rotating elements, that is, the chain wheel and the camshaft. This change is brought about by an electric actuating drive whose rotor acts on an actuating shaft of the transmission element and which also rotates in each operating state of the drive.
- the actuating shaftis operatively connected to at least one of the rotating elements and normally locked for a safe emergency operating mode.
- a significant advantage of the inventionis that during normal operation, the transmission element can be blocked in a set relative angular position of the two rotating elements and the actuating drive does not require any energy to maintain this setting. This leads to an overall lower energy consumption and thus to a lower application of heat to the actuating drive. If, nevertheless, inadmissible heating of the actuating drive should occur, it can be deactivated for the purpose of cooling when the internal combustion engine is operating without uncontrolled adjustment of the relative angular position of the two rotating elements.
- the transmission elementis blocked automatically when the actuating drive fails, thus ensuring a set emergency operating mode.
- FIGUREis a schematic, partially sectional, illustration showing a detail of a camshaft drive of an internal combustion engine with a device according to the invention.
- a rotating element which is embodied as a camshaftis designated by the reference numeral 1 .
- a further rotating element 2which is embodied as a chain wheel, is mounted on the rotating element 1 in the drive structure of a crankshaft of the internal combustion engine.
- the chain wheel 2drives the camshaft 1 via a transmission element 3 so that the camshaft 1 and the chain wheel 2 have the same rotational speed.
- the chain wheel 2which is fitted with a chain on its circumference is arranged concentrically with respect to the camshaft 1 and rotatably supported thereon, the transmission element 3 being located operatively between the camshaft 1 and the chain wheel 2 .
- the transmission element 3(not illustrated in detail) may be embodied, for example, as a planetary gear mechanism, a swash plate mechanism or the like and has an actuating shaft 4 which is acted on by a rotor 5 a of an electric actuating drive 5 .
- the drive torque which is necessary for the position adjustmentis generated between the rotor 5 a and a stator 5 b of the actuating drive 5 .
- the actuating shaft 4can, according to the invention, be operatively connected to one of the camshaft 1 and the chain gear 2 , the operative connection between the actuating shaft 4 and the chain gear 2 being illustrated in the exemplary embodiment.
- the operative connection between the actuating shaft 4 and the chain gear 2is established by means of the rotor 5 a of the actuating drive 5 , which is connected to the actuating shaft 4 in an axially displaceable fashion.
- the operative connection of the actuating shaft 4 to the chain gear 2causes the transmission element 3 to be blocked, as a result of which the relative angular position bof the camshaft 1 and the chain gear 2 remains constant.
- the rotor 5 aWhen the actuating drive 5 is not energized, the rotor 5 a is operatively connected to the chain gear 2 .
- the operative connection between the rotor 5 a and chain gear 2is made by means of an application of an axial force F A1 to the rotor 5 a , the force being generated by a disc spring 6 .
- Other devicescan also be used to generate the axial force F A1 .
- an axial force component F A2is advantageously established between the stator 5 b and rotor 5 a of the actuating drive 5 .
- Such a forcemay be generated, for example, by means of an axial offset 7 between the stator 5 b and rotor 5 a since, as a result of such an offset 7 , such an axial force component F A2 is provided.
- the rotor 5 ais not mounted rotatably on the housing, but on the rotating element 1 thus avoiding friction losses, it being also conceivable to mount it on another rotating element, for example, the actuating shaft 4 .
- the operative connection between the actuating shaft 4 and one of the rotating elements 1 , 2can also be effected by means of a component (not illustrated here) which can be actuated separately.
- the componentmay be embodied as a frictionally locking connecting element such as a brake structure and/or a non-positively locking connecting element such as a clutch and/or a positively locking connecting element such as a magnetic clutch.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
- This is a Continuation-In-Part Application PCT/EP03/04105 filed Apr. 19, 2003 and claiming the priority of German application 102 24 446.4 filed Jun. 1, 2002.
- The invention related to a device for adjusting a relative angular position of two rotating elements which are connected to a drive by a transmission element.
- Devices of this type are used for example in internal combustion engines and are provided there for effecting a relative angular adjustment of the camshaft with respect to the crank-shaft driving the camshaft. The adjustments in the kinematics of the valve drive influences within limits the phase angle of the valve opening, the opening period and the valve stroke in a variable fashion.
- DE 100 36 375 A1 discloses such a device for effecting a relative angular adjustment between a camshaft and a crank-shaft of an internal combustion engine. A chain wheel is mounted on the camshaft so as to be driven by the crankshaft, the chain wheel driving the camshaft via a transmission element. The transmission element makes it possible to change the relative angular position of the two rotating elements, that is, the chain wheel and the camshaft. This change is brought about by an electric actuating drive whose rotor acts on an actuating shaft of the transmission element and which also rotates in each operating state of the drive.
- When inertia forces which are triggered by oscillations act on the rotor of the actuating element or the actuating shaft of the transmission element, undesired adjustments of the relative angular position may take place. This has to be compensated for by the actuating drive and requires a continuous application of energy. When the actuating drive fails, this function is no longer effective and uncontrolled adjustments occur which may make the operation of the internal combustion engine difficult and possibly damage the internal combustion engine. Since the actuating drive must also continuously rotate, it may also heat up during normal operation in an unacceptable way. In such a case, the internal combustion engine would have to be shut down in order to prevent damage to the actuating drive.
- With respect to the general technical background, reference is made also to DE 100 38 354 A1 and DE 41 10 195 A1.
- It is the object of the present invention to provide a device in which the actuating drive has a low electrical energy consumption and the device has a reliable emergency operating mode.
- In a device for adjusting the relative angular position of two rotating elements which are connected to a drive and, via a transmission element, to an actuating shaft by means of which a rotor of an electric actuating drive and the relative angular position of the rotating elements can be changed, the actuating shaft is operatively connected to at least one of the rotating elements and normally locked for a safe emergency operating mode.
- A significant advantage of the invention is that during normal operation, the transmission element can be blocked in a set relative angular position of the two rotating elements and the actuating drive does not require any energy to maintain this setting. This leads to an overall lower energy consumption and thus to a lower application of heat to the actuating drive. If, nevertheless, inadmissible heating of the actuating drive should occur, it can be deactivated for the purpose of cooling when the internal combustion engine is operating without uncontrolled adjustment of the relative angular position of the two rotating elements.
- In one particular embodiment of the invention, in which the rotor of the actuating drive is operatively connected to at least one of the rotating elements in the state in which the actuating drive is not energized, the transmission element is blocked automatically when the actuating drive fails, thus ensuring a set emergency operating mode.
- The invention will become more readily apparent from the following description of a preferred embodiment thereof on the basis of the accompanying drawings.
- The sole FIGURE is a schematic, partially sectional, illustration showing a detail of a camshaft drive of an internal combustion engine with a device according to the invention.
- In the schematic illustration of the camshaft drive of an internal combustion engine, a rotating element which is embodied as a camshaft is designated by the reference numeral1. A further rotating element2, which is embodied as a chain wheel, is mounted on the rotating element1 in the drive structure of a crankshaft of the internal combustion engine. The chain wheel2 drives the camshaft1 via a
transmission element 3 so that the camshaft1 and the chain wheel2 have the same rotational speed. The chain wheel2 which is fitted with a chain on its circumference is arranged concentrically with respect to the camshaft1 and rotatably supported thereon, thetransmission element 3 being located operatively between the camshaft1 and the chain wheel2. The transmission element3 (not illustrated in detail) may be embodied, for example, as a planetary gear mechanism, a swash plate mechanism or the like and has an actuatingshaft 4 which is acted on by arotor 5aof anelectric actuating drive 5. The drive torque which is necessary for the position adjustment is generated between therotor 5aand astator 5bof the actuatingdrive 5. - By means of a relative rotation of the actuating
drive 4, the relative angular position of the two rotating elements1,2 with respect to one another can be changed. The relative rotation of the actuatingshaft 4 is brought about by means of therotor 5aof the actuatingdrive 5. - In order to bring about low energy consumption and a reliable emergency operating function, the actuating
shaft 4 can, according to the invention, be operatively connected to one of the camshaft1 and the chain gear2, the operative connection between the actuatingshaft 4 and the chain gear2 being illustrated in the exemplary embodiment. The operative connection between the actuatingshaft 4 and the chain gear2 is established by means of therotor 5aof the actuatingdrive 5, which is connected to the actuatingshaft 4 in an axially displaceable fashion. The operative connection of the actuatingshaft 4 to the chain gear2 causes thetransmission element 3 to be blocked, as a result of which the relative angular position bof the camshaft1 and the chain gear2 remains constant. - When the actuating
drive 5 is not energized, therotor 5ais operatively connected to the chain gear2. The operative connection between therotor 5aand chain gear2 is made by means of an application of an axial force FA1to therotor 5a, the force being generated by adisc spring 6. Other devices can also be used to generate the axial force FA1. - Only when the actuating drive is energized, the operative connection between the
rotor 5aand chain gear2 is released in order to keep the electrical drive power of the actuatingdrive 5 low. When the actuatingdrive 5 is energized, an axial force component FA2is advantageously established between thestator 5bandrotor 5aof the actuatingdrive 5. Such a force may be generated, for example, by means of anaxial offset 7 between thestator 5bandrotor 5asince, as a result of such anoffset 7, such an axial force component FA2is provided. - In the arrangement shown in the FIGURE the
rotor 5ais not mounted rotatably on the housing, but on the rotating element1 thus avoiding friction losses, it being also conceivable to mount it on another rotating element, for example, the actuatingshaft 4. - The operative connection between the actuating
shaft 4 and one of the rotating elements1,2 can also be effected by means of a component (not illustrated here) which can be actuated separately. The component may be embodied as a frictionally locking connecting element such as a brake structure and/or a non-positively locking connecting element such as a clutch and/or a positively locking connecting element such as a magnetic clutch. - Each of the operative connecting possibilities described above can advantageously be carried out in a frictionally locking fashion.
Claims (13)
1. A device for adjusting the relative angular position of two rotating elements (1,2) interconnected by a transmission element (3) and connected to a drive structure, including: and electric actuating drive (5), an actuating shaft (4) extending between the transmission element (3) and the electric actuating drive (5), a rotor (5a) connected to the actuating shaft (4) for operating the actuating shaft (4) in order to change the relative angular position of the rotating elements (1,2) and means for operatively engaging the actuating shaft (4) with at least one of the rotating elements (1,2).
2. A device as claimed inclaim 1 , wherein the relative angular position of the two rotating elements (1,2) remains essentially constant as a result of the operating engagement of the actuating shaft (4) with one of the rotating elements (1,2).
3. A device as claimed inclaim 1 , wherein the operative engagement between the actuating shaft (4) and one of the rotating elements (1,2) is established by the rotor (5a) of the actuating drive (5).
4. A device as claimed inclaim 3 , wherein, when the actuating drive (5) is de-energized its rotor (5a) is operatively engaged with at least one of the rotating elements (1,2).
5. A device as claimed inclaim 3 , wherein the operative engagement between the rotor (5a) and rotating element (1,2) is established by an application of an axial force (FA1) to the rotor (5a).
6. A device as claimed inclaim 3 , wherein the operative engagement is released upon energization of the actuating drive (5).
7. The device as claimed inclaim 3 , wherein, upon energization of the actuating drive (5), an axial force (FA2) is active between a stator (5b) and the rotor (5a) of the actuating drive (5).
8. The device as claimed inclaim 7 , wherein the effect of the axial force (FA2) between the stator (5b) and rotor (5b) is caused by an axial offset (7) between the stator (5b) and rotor (5a).
9. The device as claimed inclaim 1 , wherein the rotor (5a) of the electric actuating drive (5) is mounted on one of the rotating elements (1,2).
10. The device as claimed inclaim 1 , wherein the rotor (5a) of the electric actuating drive (5) is directly connected to an actuating shaft (4).
11. The device as claimed inclaim 1 , wherein the operative connection between the actuating shaft (4) and the rotating element (1,2) is established by a component which can be actuated separately.
12. The device as claimed inclaim 11 , wherein the component which can be actuated separately establishes one of a frictionally locking, a positively locking and a non-positively locking engagement.
13. The device as claimed inclaim 1 , wherein the operative connection is established by frictional engagement.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/003,009US20050115529A1 (en) | 2002-06-01 | 2004-12-01 | Device for adjusting the relative angular position of two rotating elements |
| US11/437,257US7824271B2 (en) | 2002-06-01 | 2006-05-19 | Device for adjusting the relative angular position of two rotating elements |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002124446DE10224446A1 (en) | 2002-06-01 | 2002-06-01 | Device for relative angular adjustment between two rotating elements |
| DE10224446.4 | 2002-06-01 | ||
| PCT/EP2003/004105WO2003102381A1 (en) | 2002-06-01 | 2003-04-19 | Device for effecting the relative angular adjustment between two rotating elements |
| US11/003,009US20050115529A1 (en) | 2002-06-01 | 2004-12-01 | Device for adjusting the relative angular position of two rotating elements |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2003/004105Continuation-In-PartWO2003102381A1 (en) | 2002-06-01 | 2003-04-19 | Device for effecting the relative angular adjustment between two rotating elements |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/437,257Continuation-In-PartUS7824271B2 (en) | 2002-06-01 | 2006-05-19 | Device for adjusting the relative angular position of two rotating elements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20050115529A1true US20050115529A1 (en) | 2005-06-02 |
Family
ID=34621235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/003,009AbandonedUS20050115529A1 (en) | 2002-06-01 | 2004-12-01 | Device for adjusting the relative angular position of two rotating elements |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US20050115529A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060278187A1 (en)* | 2003-12-24 | 2006-12-14 | Ina-Schaeffler Kg | Camshaft adjuster |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4494496A (en)* | 1982-03-24 | 1985-01-22 | Toyota Jidosha Kabushiki Kaisha | Variable valve-timing apparatus in an internal-combustion engine |
| US6257186B1 (en)* | 1999-03-23 | 2001-07-10 | Tcg Unitech Aktiengesellschaft | Device for adjusting the phase angle of a camshaft of an internal combustion engine |
- 2004
- 2004-12-01USUS11/003,009patent/US20050115529A1/ennot_activeAbandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4494496A (en)* | 1982-03-24 | 1985-01-22 | Toyota Jidosha Kabushiki Kaisha | Variable valve-timing apparatus in an internal-combustion engine |
| US6257186B1 (en)* | 1999-03-23 | 2001-07-10 | Tcg Unitech Aktiengesellschaft | Device for adjusting the phase angle of a camshaft of an internal combustion engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060278187A1 (en)* | 2003-12-24 | 2006-12-14 | Ina-Schaeffler Kg | Camshaft adjuster |
| US7475660B2 (en) | 2004-06-02 | 2009-01-13 | Ina-Schaeffler Kg | Camshaft adjuster |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment | Owner name:DAIMLERCHRYSLER AG, GERMANY Free format text:ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VON GAISBERG-HELFENBERG, ALEXANDER;REEL/FRAME:016227/0411 Effective date:20050110 | |
| STCB | Information on status: application discontinuation | Free format text:ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |