DE102008058110A1 - Camshaft adjuster i.e. vane type camshaft adjuster, has stator rotatable against spring force of spring i.e. torsion bar spring, opposite to partial hollow composite camshaft, where spring is partially and radially arranged within rotor hub - Google Patents
Camshaft adjuster i.e. vane type camshaft adjuster, has stator rotatable against spring force of spring i.e. torsion bar spring, opposite to partial hollow composite camshaft, where spring is partially and radially arranged within rotor hub Download PDFInfo
- Publication number
- DE102008058110A1 DE102008058110A1 DE102008058110A DE102008058110A DE102008058110A1 DE 102008058110 A1 DE102008058110 A1 DE 102008058110A1 DE 102008058110 A DE102008058110 A DE 102008058110A DE 102008058110 A DE102008058110 A DE 102008058110A DE 102008058110 A1 DE102008058110 A1 DE 102008058110A1
- Authority
- DE
- Germany
- Prior art keywords
- camshaft
- spring
- camshaft adjuster
- stator
- adjuster
- 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.)
- Granted
Links
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
- 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
-
- 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
- F01L1/024—Belt 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
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
-
- 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
- F01L2001/0475—Hollow camshafts
-
- 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
-
- 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
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34483—Phaser return springs
-
- 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
- F01L2301/00—Using particular materials
-
- 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
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/03—Reducing vibration
Abstract
Description
Die Erfindung betrifft einen Nockenwellenversteller gemäß dem Oberbegriff von Patentanspruch 1.The The invention relates to a camshaft adjuster according to the The preamble of claim 1.
Aus
der
Aus
der
Aufgabe der Erfindung ist es, einen axial kurz bauenden Nockenwellenversteller zu bauen.task The invention is an axially short-built camshaft adjuster to build.
Gemäß einem Vorteil der Erfindung findet ein Flügelzellennockenwellenversteller Anwendung. Dieser Flügelzellennockenwellenversteller baut axial sehr kurz, was den engen Bauraumverhältnissen sowohl von quer als auch von längs eingebauten Antriebssträngen zugute kommt.According to one Advantage of the invention finds a Flügelzellennockenwellenversteller Application. This winged cell camshaft adjuster is building axially very short, what the tight space conditions both transverse as well as longitudinally installed drive trains benefits.
Gemäß einem weiteren Vorteil der Erfindung hält eine zumindest teilweise innerhalb der Nockenwelle angeordnete Feder den Rotor gegenüber dem Stator in einer bestimmten Winkelstellung. Dieser Bereich der Nockenwelle, in dem zumindest ein Teil der Feder angeordnet ist, kann dabei auch ein rohrförmiger oder gebohrter Ansatz an der Nockenwelle sein. Dieser Ansatz kann zugleich eine zentrierende Funktion haben.According to one Another advantage of the invention holds at least partially inside the cam shaft arranged spring facing the rotor the stator in a certain angular position. This area of Camshaft, in which at least a part of the spring is arranged, can also be a tubular or drilled approach be on the camshaft. This approach can also be a centering function to have.
In einer besonders vorteilhaften Ausgestaltung ist jedoch die Nockenwelle selbst als hohle gebaute Nockenwelle ausgeführt. Die Feder kann beispielsweise als Drehstabfeder ausgeführt sein.In However, a particularly advantageous embodiment is the camshaft even designed as a hollow built camshaft. The feather can for example be designed as a torsion bar.
Zur Verbindung der Feder mit der Nockenwelle kann ein Einsatz in die hohle Nockenwelle eingesetzt werden und drehfest mit dieser verbunden werden. Dieser Einsatz weist dann eine Verbindung mit der Feder auf. Die Feder kann an deren anderem Ende insbesondere mit einem Deckel des Nockenwellenverstellers verbunden sein.to Connecting the spring to the camshaft may be an insert in the hollow camshaft are used and rotatably connected to this. This insert then has a connection with the spring. The Spring can at the other end in particular with a lid of the Camshaft adjuster connected.
Bei der dem Auslass zugeordneten Nockenwelle kann mit der Feder der Rotor in eine für den Motorstart nötige frühe Auslassnockenwellenstellung gebracht werden. Generell können bei beiden Nockenwellen – d. h. Einlass und Auslass – durch eine Vorspannung der Feder in eine Drehmomentenrichtung die Wechselmomente der Nockenwelle kompensiert werden, welche in den beiden Drehmomentenrichtungen der Nockenwelle unterschiedlich stark wirksam sind. Diese Wechselmomente entstehen durch die Ventilfederkräfte an den Gaswechselventilen und sind stark abhängig von der Anzahl der Zylinder. Die Wechselmomente sind umso ungleichförmiger, je weniger Zylinder der Verbrennungsmotor aufweist. Dabei kann die Feder in besonders vorteilhafter Weise in Ruhelage in die Drehmomentenrichtung „Früh” verdreht sein, da die Verstellung des Flügelzellennockenwellenverstellers in Drehmomentenrichtung „Spät” aufgrund der unterstützenden Wirkung durch die Wechselmomente ohnehin schneller erfolgt. Somit wird mittels der Feder erreicht, dass die Verstellung in „Früh” ebenso schnell geht wie in „Spät”.at the exhaust camshaft associated with the outlet of the Rotor in a necessary for the engine start early Exhaust camshaft position are brought. Generally speaking with both camshafts - d. H. Inlet and outlet - through a bias of the spring in a torque direction, the alternating moments the camshaft are compensated, which in the two directions of torque the camshaft are effective different degrees. These alternating moments caused by the valve spring forces on the gas exchange valves and are heavily dependent on the number of cylinders. The Alternating moments are all the more irregular, the fewer cylinders the internal combustion engine has. In this case, the spring in particular advantageously twisted in the rest position in the torque direction "early" be, since the adjustment of the Flügelzellennockenwellenwellenverstellers in torque direction "late" due the supporting effect through the alternating moments anyway faster. Thus, by means of the spring is achieved that the adjustment goes as fast in "Früh" as in "Late".
Zur Versorgung der Druckkammern des Nockenwellenverstellers mit Druckmedium – insbesondere Öl – können in einer besonders vorteilhaften Ausgestaltung der Erfindung Kanäle vorgesehen sein, die sich an Hülsen bilden, die in die hohle Nockenwelle radial außerhalb der Feder eingesetzt sind.to Supply of the pressure chambers of the camshaft adjuster with pressure medium - especially oil - can in a particularly advantageous embodiment of the invention channels be provided, which form on sleeves, in the hollow camshaft are inserted radially outside the spring.
Weitere Vorteile der Erfindung gehen aus den weiteren Patentansprüchen, der Beschreibung und der Zeichnung vor.Further Advantages of the invention will become apparent from the further claims, the description and the drawing.
Die Erfindung ist nachfolgend anhand eines Ausführungsbeispiels näher erläutert.The The invention is based on an embodiment explained in more detail.
Dabei zeigenthere demonstrate
Der
Stator
Die
Stege liegen mit ihren radial inneren Stirnseiten dichtend an der
Außenmantelfläche
Der
Rotor
Der
Stator
Die
Drehstabfeder
Die
der einen Verstellrichtung zugeordneten Druckkammern
Die
Drehstabfeder
Um Schwingungen in der Eigenfrequenz sicher auszuschließen, die zum Anschlagen des Rotors gegen den Stator führen würden, können geeignete Dämpfungsmittel vorgesehen sein. Diese können im radialen Zwischenraum zwischen der Drehstabfeder und der Hohlwelle vorgesehen sein. Dies können insbesondere Reibkörper sein, die drehfest auf die Drehstabfeder gesetzt sind und an der Innenwand der Nockenwelle reiben. Die Dämpfungsmittel können aber auch im Nockenwellenversteller selbst vorgesehen sein. Dabei kann beispielsweise die Formgebung der Flügel und der Stege derart ausgeführt sein, dass vor dem Anschlag der Flügel an die Stege das hydraulische Fluid zum Betrieb des Nockenwellenverstellers abgeschert wird. Ebenso ist es möglich, eine hydraulische Dämpfung in die hohle Nockenwelle zu legen. Beispielsweise kann der Innenraum innerhalb der Nockenwelle mit einem Fluid gefüllt sein, wobei die Feder im Inneren der Nockenwelle mit Flügeln versehen ist, die dieses Fluid beim tordieren abscheren.Around Safely exclude vibrations in the natural frequency, which would lead to striking the rotor against the stator, suitable damping means may be provided. These can be in the radial gap between the torsion bar spring and the hollow shaft may be provided. This can be especially Be friction, the non-rotatably placed on the torsion bar are and rub against the inner wall of the camshaft. The damping means can but also be provided in the camshaft adjuster itself. there For example, the shape of the wings and the webs be designed so that before the attack of the wing to the webs, the hydraulic fluid for operating the camshaft adjuster is sheared off. It is also possible to use a hydraulic To put damping in the hollow camshaft. For example For example, the interior can be filled with fluid within the camshaft be, with the spring inside the camshaft with wings is provided, which shear off this fluid during twisting.
Die Feder muss somit nicht als runde Drehstabfeder mit einer linearen Federkennung ausgeführt sein. Die Feder kann beispielsweise auch eine progressive Federkennung aufweisen, die verhindert, dass der Rotor zum Anschlag an den Stator kommt.The Spring therefore does not need to be a round torsion bar with a linear Spring identification be executed. For example, the spring can be also have a progressive spring rate, which prevents the rotor comes to the stop against the stator.
Anstelle der Drehstabfeder kann auch eine andere Feder innerhalb der Nockenwelle vorgesehen sein. Beispielsweise Spiralfedern sind bei entsprechend steifer Dimensionierung möglich.Instead of The torsion spring can also be another spring within the camshaft be provided. For example, coil springs are in accordance Stiffer sizing possible.
Bei den beschriebenen Ausführungsformen handelt es sich nur um beispielhafte Ausgestaltungen. Eine Kombination der beschriebenen Merkmale für unterschiedliche Ausführungsformen ist ebenfalls möglich. Weitere, insbesondere nicht beschriebene Merkmale der zur Erfindung gehörenden Vorrichtungsteile, sind den in den Zeichnungen dargestellten Geometrien der Vorrichtungsteile zu entnehmen.at the described embodiments are only by exemplary embodiments. A combination of the described Features for different embodiments is also possible. Further, in particular not described features the device parts belonging to the invention, are the in the drawings illustrated geometries of the device parts refer to.
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 10333850 B4 [0002] - DE 10333850 B4 [0002]
- - DE 10160246 C1 [0002] - DE 10160246 C1 [0002]
- - DE 10125498 A1 [0002] - DE 10125498 A1 [0002]
- - DE 102008029692 [0002] - DE 102008029692 [0002]
- - WO 2008/0150062 A2 [0003] - WO 2008/0150062 A2 [0003]
- - DE 102006019435 A1 [0016, 0020] - DE 102006019435 A1 [0016, 0020]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008058110.0A DE102008058110B4 (en) | 2008-11-18 | 2008-11-18 | Phaser |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008058110.0A DE102008058110B4 (en) | 2008-11-18 | 2008-11-18 | Phaser |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102008058110A1 true DE102008058110A1 (en) | 2010-05-20 |
DE102008058110B4 DE102008058110B4 (en) | 2014-08-21 |
Family
ID=42105232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102008058110.0A Expired - Fee Related DE102008058110B4 (en) | 2008-11-18 | 2008-11-18 | Phaser |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102008058110B4 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011017150A1 (en) * | 2011-04-15 | 2012-10-18 | Volkswagen Aktiengesellschaft | Shaft-hub-connection for steering column of motor vehicle steering, has shaft having coupling portion and hub with another coupling portion, where coupling portions engage into each other |
JP2013002449A (en) * | 2011-06-15 | 2013-01-07 | Mahle Internatl Gmbh | Internal combustion engine |
WO2013167311A1 (en) * | 2012-05-07 | 2013-11-14 | Schaeffler Technologies AG & Co. KG | Camshaft adjuster and separating sleeve for a camshaft adjuster |
DE102013207747A1 (en) * | 2013-04-29 | 2014-10-30 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic camshaft adjuster with partial recess on its camshaft flange surface |
DE102014002362A1 (en) | 2014-02-18 | 2015-08-20 | Daimler Ag | Camshaft adjuster with a stop damping |
CN113958685A (en) * | 2021-11-08 | 2022-01-21 | 重庆市巨亮机械制造有限责任公司 | Powder metallurgy camshaft end combination |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10125498A1 (en) | 2001-05-23 | 2002-12-19 | Salzgitter Antriebstechnik Gmb | Camshaft and method for manufacturing a camshaft |
DE10160246C1 (en) | 2001-12-07 | 2003-04-17 | Thyssen Krupp Automotive Ag | Hollow shaft, e.g. drive shaft, has component, e.g. gear well, mounted on it by widening its end, e.g. by inserting conical mandrel, tube being supported by bush inserted into it at inner end of mandrel |
DE10333850B4 (en) | 2003-07-24 | 2005-11-17 | Muhr Und Bender Kg | Built camshaft with camshaft adjuster |
DE102006019435A1 (en) | 2006-01-18 | 2007-07-19 | Hydraulik-Ring Gmbh | Rotor for e.g. oscillating motor like-camshaft adjuster, has interlocking opening, which is sliding hole, that passes via one of blades of rotor and provided with two different cross sections, where opening supports casing in sections |
WO2008015062A2 (en) | 2006-08-02 | 2008-02-07 | Schaeffler Kg | Metal sealing sheet for a camshaft adjuster, and camshaft adjuster |
DE102008029692A1 (en) | 2008-06-24 | 2010-01-07 | Hydraulik-Ring Gmbh | Cam shaft i.e. shaft pipe, for internal combustion engine, has vane adjuster including rotor, and axial stop sleeve connected axial-fixedly with cam shaft, where rotor is deformed against axial stop sleeve |
-
2008
- 2008-11-18 DE DE102008058110.0A patent/DE102008058110B4/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10125498A1 (en) | 2001-05-23 | 2002-12-19 | Salzgitter Antriebstechnik Gmb | Camshaft and method for manufacturing a camshaft |
DE10160246C1 (en) | 2001-12-07 | 2003-04-17 | Thyssen Krupp Automotive Ag | Hollow shaft, e.g. drive shaft, has component, e.g. gear well, mounted on it by widening its end, e.g. by inserting conical mandrel, tube being supported by bush inserted into it at inner end of mandrel |
DE10333850B4 (en) | 2003-07-24 | 2005-11-17 | Muhr Und Bender Kg | Built camshaft with camshaft adjuster |
DE102006019435A1 (en) | 2006-01-18 | 2007-07-19 | Hydraulik-Ring Gmbh | Rotor for e.g. oscillating motor like-camshaft adjuster, has interlocking opening, which is sliding hole, that passes via one of blades of rotor and provided with two different cross sections, where opening supports casing in sections |
WO2008015062A2 (en) | 2006-08-02 | 2008-02-07 | Schaeffler Kg | Metal sealing sheet for a camshaft adjuster, and camshaft adjuster |
DE102008029692A1 (en) | 2008-06-24 | 2010-01-07 | Hydraulik-Ring Gmbh | Cam shaft i.e. shaft pipe, for internal combustion engine, has vane adjuster including rotor, and axial stop sleeve connected axial-fixedly with cam shaft, where rotor is deformed against axial stop sleeve |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011017150A1 (en) * | 2011-04-15 | 2012-10-18 | Volkswagen Aktiengesellschaft | Shaft-hub-connection for steering column of motor vehicle steering, has shaft having coupling portion and hub with another coupling portion, where coupling portions engage into each other |
JP2013002449A (en) * | 2011-06-15 | 2013-01-07 | Mahle Internatl Gmbh | Internal combustion engine |
WO2013167311A1 (en) * | 2012-05-07 | 2013-11-14 | Schaeffler Technologies AG & Co. KG | Camshaft adjuster and separating sleeve for a camshaft adjuster |
US10190447B2 (en) | 2012-05-07 | 2019-01-29 | Schaeffler Technologies Gmbh & Co. Kg | Camshaft adjuster and separating sleeve for a camshaft adjuster |
DE102013207747A1 (en) * | 2013-04-29 | 2014-10-30 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic camshaft adjuster with partial recess on its camshaft flange surface |
DE102014002362A1 (en) | 2014-02-18 | 2015-08-20 | Daimler Ag | Camshaft adjuster with a stop damping |
CN113958685A (en) * | 2021-11-08 | 2022-01-21 | 重庆市巨亮机械制造有限责任公司 | Powder metallurgy camshaft end combination |
CN113958685B (en) * | 2021-11-08 | 2024-03-12 | 重庆市巨亮机械制造有限责任公司 | Powder metallurgy camshaft end combination |
Also Published As
Publication number | Publication date |
---|---|
DE102008058110B4 (en) | 2014-08-21 |
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