EP3268586A1 - Betätigungshebel für einen ventiltrieb eines verbrennungsmotors sowie ventiltrieb mit dem betätigungshebel - Google Patents
Betätigungshebel für einen ventiltrieb eines verbrennungsmotors sowie ventiltrieb mit dem betätigungshebelInfo
- Publication number
- EP3268586A1 EP3268586A1 EP16708347.6A EP16708347A EP3268586A1 EP 3268586 A1 EP3268586 A1 EP 3268586A1 EP 16708347 A EP16708347 A EP 16708347A EP 3268586 A1 EP3268586 A1 EP 3268586A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lever
- valve
- actuating lever
- actuating
- contact surface
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- 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
- F01L2301/02—Using ceramic materials
Definitions
- the invention relates to an actuating lever for a valve train of an internal combustion engine having a lever portion, wherein the lever portion has a support surface for transmitting a valve actuation movement, and having a pivot portion for pivotally mounting the lever portion about a pivot axis. Furthermore, the invention relates to a valve train with at least one such actuating lever.
- valve inlets and outlets are usually opened and closed via inlet valves and outlet valves.
- camshafts are used for actuating the intake valves and exhaust valves. Between cams of the camshafts and the intake valves or exhaust valves often levers are arranged, which transmit the actuations.
- the publication DE 10 2006 052 820 A1 discloses a towing or rocker arm for actuating a gas exchange valve of an internal combustion engine.
- the towing or rocker arm has a deformed lever body, which forms an upwardly open cross-sectional profile in the region of a valve-side arm portion having side walls and a cross bar, wherein on a lower side of the crossbar a valve actuating surface extends, which is lined by two longitudinal webs.
- the crossbar and the longitudinal webs are integrally formed.
- the longitudinal webs are bent on the underside of the crossbar and welded to run on the bottom contact surfaces.
- the invention thus relates to an actuating lever which is suitable and / or designed for a valve train of an internal combustion engine.
- the actuating lever is designed for actuating a valve, in particular a gas exchange valve, of the valve drive for the internal combustion engine.
- the valve may be an intake valve or an exhaust valve.
- the internal combustion engine is preferably designed as a traction engine for a vehicle, in particular for a passenger car, truck, bus, etc.
- the internal combustion engine is realized as a gasoline engine or as a diesel engine.
- the opening and closing of the valve is controlled or operated in the internal combustion engine.
- the operating lever has a lever portion, wherein the lever portion has a support surface for transmitting a valve actuation movement.
- the support surface is formed as a flat surface or a flat surface portion having an area of at least ten square millimeters.
- the contact surface is oriented in the direction of the valve.
- the lever section is in particular a valve-side lever section.
- the actuating lever has a pivoting portion, which is preferably rigidly connected to the lever portion.
- the pivoting section is suitable and / or designed for the pivotable mounting of the lever section about a pivot axis.
- the pivoting portion may be formed, for example, as a pivot receiver, through which a mechanical pivot axis runs. Alternatively, a bolt with a roller arranged thereon can also be provided in the pivoting section.
- the actuating lever is pivotally mounted about the pivot axis, wherein the support surface is preferably arranged in a plane to which the pivot axis is parallel or in which the pivot axis is arranged.
- the support surface can transmit the valve actuating movement.
- the valve actuating movement is transmitted to the valve.
- the actuating lever has a ceramic layer, wherein the ceramic layer is arranged on the support surface and forms a contact surface for transmitting the valve actuation movement.
- the ceramic layer is formed as a wear-resistant layer.
- a contact surface in particular a valve contact surface, is formed, which has an increased hardness, a higher mechanical strength, a higher dimensional stability and / or a higher wear resistance compared to the base material of the lever portion, in particular the support surface having.
- This improved mechanical properties ensures that the actuating lever does not wear out or deforms mechanically even during prolonged use, so that an adjustment of the actuated valve is not necessary even over a long service life.
- the actuating lever with the ceramic layer thus allows a particularly reliable and long-lasting function of the operating lever and thus of the valve train.
- the contact surface is designed as a valve contact surface for direct contacting of a valve stem of the valve.
- the valve actuation movement can be transmitted to the valve via one or more further intermediate elements.
- the ceramic layer is formed as a thermally sprayed ceramic layer.
- the realization of this The underlying method of thermal spraying is a surface coating process.
- the thermal spraying according to the definition of DIN EN 657.
- so-called spray additives inside or outside of a spray burner ab-, melted or accelerated in a gas stream in the form of spray particles and on the surface of the coated Component, in this example, the wing, hurled.
- the component surface in this case the support surface, is not melted and only subjected to a low thermal load.
- the temperature of the wing is less than 150 ° C.
- a layer formation takes place, since the spray particles flatten on impact on the component surface, in this case the support surface, depending on the process and material, remain liable primarily by mechanical clamping and layer by layer build up the spray layer.
- the ceramic layer is formed by ceramic materials, especially oxide ceramic materials, such as alumina, magnesia, zirconia, titania or multi-component systems such as aluminum titanate, mullite, etc., or dispersion ceramics such as zirconium reinforced alumina. Zirconia is particularly preferably used as a ceramic material for the ceramic layer. Particularly preferably, the ceramic layer is plasma sprayed or flame-sprayed. The type of application ensures that the connection between the ceramic layer and the support surface is designed to be load-bearing.
- the layer thickness of the ceramic layer is preferably more than 50 ⁇ , in particular more than 80 ⁇ and / or preferably less than 150 ⁇ , in particular less than 120 ⁇ .
- the actuating lever is designed as a pivot lever.
- the actuating lever is designed as a drag lever or as a rocker arm.
- an actuation of the drag lever takes place on the lever section, so that the lever section is arranged between an actuating member, such as a cam of a camshaft and a valve.
- the Actuating lever is designed as a rocker arm, which has a further lever portion, which is arranged on the side facing away from the lever portion of the pivot portion and is rigidly connected thereto.
- the actuation is initiated in the manner of a rocker on the side of the further lever section.
- the lever portion has a transverse bar area, wherein the transverse bar area extends in the axial direction and in particular parallel to the pivot axis. Furthermore, the lever portion on foundedsarm Anlagene, which form an axial-lateral boundary on the contact surface. The contact surface is arranged on the transom area.
- the guide arm portions form side bars to the crossbar portion. In particular, the guide arm regions are designed for lateral guidance of the valve.
- the actuating lever on a base body wherein the base body is formed as a forming part.
- the forming part is formed as a sheet metal forming part.
- the sheet metal forming part is formed as a stamped and bent part.
- the forming part is made of steel, e.g. made of 16MnCr5 as base material.
- the combination of a ceramic layer and the forming part made of steel is particularly advantageous that the forming part is inexpensive to produce, but has the tendency to deform at too high a temperature load. By the thermal spraying of the ceramic layer can be achieved that the ceramic layer adheres firmly to the support surface, the body does not deform or distort and at the same time the production of the operating lever is inexpensive.
- the forming part comprises the guide arm areas and the crossbar area.
- the guide arm areas and the transverse bar area are formed integrally with the forming part and / or in one material.
- the forming part has two side cheek areas which extend from the lever section via the pivoting section and optionally in addition via the further lever section.
- the side cheek areas are aligned to be equal to a radial plane to the pivot axis.
- the side cheek sections each have a receptacle, such as a passage opening for receiving and / or mechanical coupling of a pivoting device, such as from a mechanical pivot axis or a pivot pin.
- the crossbar area extends between the two side cheek areas integrally connecting the side cheek areas.
- the lever portion is U-shaped in a cross-section perpendicular to its longitudinal extent, wherein the side cheek areas form the free legs and the transverse bar area the connecting leg.
- the contact surface is disposed on a side of the crossbar portion which faces away from the side cheek portions.
- the specificationssarm Schemee are formed as extensions of the side cheeks areas and bent so that they rest on the crossbar area or almost rest.
- the guide arm regions can be connected, in particular welded, at the free ends to the side cheek regions for position fixation.
- the forming part has one or the further lever section, wherein the pivoting section is arranged between the lever section and the further lever section.
- the operating lever is formed as a straight lever, so that the lever portion, hinge portion and further lever portion form a line.
- the further lever section has a connecting region, wherein the connecting region extends in the axial direction between the side cheek regions and integrally connects them to one another.
- the further lever portion is U-shaped in a cross section perpendicular to the longitudinal extent of the actuating lever, wherein the two side cheek areas form the free legs and the connecting area forms the connecting leg.
- a receiving structure for an actuating element such as an actuating tappet is arranged, in particular formed by forming technology.
- Another object of the invention relates to a valve train for an internal combustion engine, wherein the valve train has at least one valve and at least one actuating lever, as has been previously described or according to one of the preceding claims.
- the valve train is provided that the valve is actuated via the actuating lever.
- the actuating lever actuates the valve with the interposition of intermediate elements.
- the actuating lever directly contact the valve so that a free end of the valve stem of the valve is in physical contact with the ceramic layer of the actuating lever. In this way, the advantages of the ceramic layer can be used particularly well.
- Figure 1 is a schematic three-dimensional representation of an actuating lever for a valve train of an internal combustion engine as an embodiment of the invention
- Figure 2 of the actuating lever in Figure 1 in a schematic plan view from the bottom.
- FIG. 1 shows an actuating lever 1 for a valve drive of an internal combustion engine as a first exemplary embodiment of the invention.
- the actuating lever 1 can be subdivided into a pivoting section 2, a valve-side lever section 3 and, in this embodiment, into a further lever section 4.
- Lever section 3, pivot portion 2 and further lever portion 4 are arranged in a line one behind the other and integrally connected.
- the operating lever 1 can be pivoted about a pivot axis 5, which passes through the pivot portion 2, so Lever section 3 and further lever section 4 rocker-like move about the pivot axis 5.
- a roller 7 is placed in the pivot portion 2, on which a roller 7 is placed.
- the roller 7 can be arranged on a supporting element, not shown, so that the operating lever 1 can be pivoted about the pivot axis 5.
- the lever portion 3 has a contact surface 8, which is flat or slightly curved and extends substantially in a plane which is aligned parallel to the pivot axis 5.
- a valve actuation movement can be initiated via the receiving structure 6 of the further lever section 4, so that the actuating lever 1 is pivoted about the pivot axis 5 and the valve actuating movement is transmitted via the contact surface 8 to the free end of a valve stem, not shown, of a valve to control this especially to open or close.
- the contact surface 8 thus serves to transmit a valve actuation movement to the valve, not shown, and thus forms a valve contact surface.
- the actuating lever 1 has a base body 9, which is designed as a shaped part, in particular as a sheet-metal forming part made of 16MnCr5.
- the main body 9 has two side cheeks 10 a, b, which extend rectified to a radial plane to the pivot axis 5.
- the side cheeks 10a, b carry the pivot pin 16, so that the pivot pin 16, the side cheeks 10a, b supported in the pivot portion 2 against each other.
- the side walls 10 a, b are integrally connected to each other via a connecting portion 1 1, wherein in the Connecting region 1 1, the receiving structure 6 is introduced and formed in this case.
- the side cheeks 10a, b are integrally connected by a crossbar portion 12 which extends from one side cheek 10a to the other side cheek 10b and provides a support surface 13 for the contact surface 8.
- a ceramic layer 14 is at least partially applied surface, which forms the contact surface 8.
- the ceramic layer 14 is applied by thermal spraying, for example, the ceramic layer 14 is plasma sprayed or flame-sprayed and has a thickness of about 100 ⁇ on and is e.g. made of zirconium oxide.
- the ceramic layer 14 forms a wear protection of the contact surface 8.
- the side cheeks 10a, b merge integrally into guide arm regions 15a, b, which, starting from an upper side of the side cheeks 10a, b, are folded over twice and form axial side boundaries, side webs or side walls for the contact surface 8.
- the actuating lever 1 is guided relative to the valve stem of the valve in the axial direction to the pivot axis.
- the free ends of the guide arm 15a are connected to the base body 9, in particular with a portion of the side walls 10a, b cohesively, for example by welding.
- FIG. 2 shows the actuating lever 1 of FIG. 1 in a schematic plan view from the underside.
- the side cheek areas 15 a, b are arranged congruently to the side cheek areas 10 a, b and laterally delimit the contact surface 8, indicated by a broken line, with the ceramic layer 14 in the axial direction to the pivot axis 5.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015204416.5A DE102015204416A1 (de) | 2015-03-12 | 2015-03-12 | Betätigungshebel für einen Ventiltrieb eines Verbrennungsmotors sowie Ventiltrieb mit dem Betätigungshebel |
| PCT/DE2016/200088 WO2016141931A1 (de) | 2015-03-12 | 2016-02-12 | Betätigungshebel für einen ventiltrieb eines verbrennungsmotors sowie ventiltrieb mit dem betätigungshebel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3268586A1 true EP3268586A1 (de) | 2018-01-17 |
| EP3268586B1 EP3268586B1 (de) | 2020-04-08 |
Family
ID=55484785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16708347.6A Active EP3268586B1 (de) | 2015-03-12 | 2016-02-12 | Betätigungshebel für einen ventiltrieb eines verbrennungsmotors sowie ventiltrieb mit dem betätigungshebel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3268586B1 (de) |
| DE (1) | DE102015204416A1 (de) |
| WO (1) | WO2016141931A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5987209A (ja) * | 1982-11-12 | 1984-05-19 | Toyota Motor Corp | ロツカ−ア−ム |
| JPH0643053B2 (ja) * | 1987-05-13 | 1994-06-08 | いすゞ自動車株式会社 | セラミック被覆層の形成方法 |
| JPH0199905U (de) * | 1987-12-24 | 1989-07-05 | ||
| DE69309346T2 (de) * | 1992-01-07 | 1997-07-10 | Koyo Seiko Co | Kipphebel mit rolle und dessen herstellungsverfahren |
| JPH08135764A (ja) * | 1994-11-14 | 1996-05-31 | Sumitomo Electric Ind Ltd | 摺動部品およびその製造方法 |
| DE102006052820B4 (de) | 2006-11-09 | 2015-10-01 | Schaeffler Technologies AG & Co. KG | Schlepp- oder Kipphebel zur Betätigung eines Gaswechselventils einer Brennkraftmaschine |
-
2015
- 2015-03-12 DE DE102015204416.5A patent/DE102015204416A1/de not_active Withdrawn
-
2016
- 2016-02-12 EP EP16708347.6A patent/EP3268586B1/de active Active
- 2016-02-12 WO PCT/DE2016/200088 patent/WO2016141931A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015204416A1 (de) | 2016-09-15 |
| WO2016141931A1 (de) | 2016-09-15 |
| EP3268586B1 (de) | 2020-04-08 |
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| AT521452B1 (de) | Zylinderkopf |
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