WO2003042510A1 - Schlepphebel eines ventiltriebs einer brennkraftmaschine - Google Patents
Schlepphebel eines ventiltriebs einer brennkraftmaschine Download PDFInfo
- Publication number
- WO2003042510A1 WO2003042510A1 PCT/EP2002/011774 EP0211774W WO03042510A1 WO 2003042510 A1 WO2003042510 A1 WO 2003042510A1 EP 0211774 W EP0211774 W EP 0211774W WO 03042510 A1 WO03042510 A1 WO 03042510A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lever
- rocker arm
- inner lever
- cam
- valve
- Prior art date
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
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the invention relates to a rocker arm of a valve train of an internal combustion engine, which can be switched over to different valve strokes for at least one gas exchange valve, with an outer lever, between the arms of which an inner lever that is relatively pivotable relative to this is positioned and both levers can be coupled to one another via coupling means such that A large valve stroke is generated and a smaller one when decoupled, the rocker arm having a system for a gas exchange valve at one end, a complementary surface for a support element at the opposite end, and at least one of the levers having a contact surface for a cam.
- a generic rocker arm is previously known from DE-OS 27 53 197.
- the inner lever communicates with a large stroke cam and the outer lever communicates with a small stroke cam pair.
- Sliding taps are provided as cam taps. It is disadvantageous in this prior art that the sliding taps unnecessarily increase the valve train friction.
- drag levers of the generic type In general, it is customary for drag levers of the generic type to only provide the inner lever with a role as a cam counter-rotor and to the
- the object of the invention is therefore to provide a rocker arm of the aforementioned type, in which the disadvantages described are eliminated.
- this object is achieved by the features of the characterizing part of claim 1 in that a rotatable roller is applied or only applied to the lever which, empirically or statistically, predominantly transmits the cam stroke to the gas exchange valve during operation of the internal combustion engine
- a rotatable roller is applied or only applied to the lever which, empirically or statistically, predominantly transmits the cam stroke to the gas exchange valve during operation of the internal combustion engine
- the lever which predominantly transmits the cam stroke during normal operation of the internal combustion engine, has the role of a cam counter running surface.
- This is preferably the inner lever and the roller is preferably mounted on a pin via a roller bearing such as a needle bearing. Sliding taps are provided on the contact surfaces of the arms of the outer lever for the large lift cam. As a result, a low-friction cam tap is applied in the predominant operating points of the internal combustion engine (low load is partial load), for which only a small valve lift is desired.
- the inner lever has the system for the gas exchange valve at one end and a complementary surface for storage on a preferably hydraulic support element at the opposite end.
- a complementary surface is in particular a dome-shaped indentation on the inner lever. This enables a simple pivoting movement of the rocker arm on the support element.
- Sliders which are not explained in more detail, are provided as coupling means, which can be displaced, for example hydraulically or electromagnetically or via compression spring force, in at least one axial direction.
- coupling means which can be displaced, for example hydraulically or electromagnetically or via compression spring force, in at least one axial direction.
- the slides can also run outside of an axial line for the roller.
- other coupling means such as jack-like and ball-like and similar are also conceivable.
- the inner lever on the side of one end with its abutment should clearly project beyond an end face of the outer lever in this area.
- the outer lever is therefore only as long as absolutely necessary. This reduces the mass and the overall construction effort on the rocker arm.
- a simple connection of the inner lever to the outer lever is the subject of a further subclaim.
- a bolt or a similar component extends through the inner lever in the area of the opposite end, on which the arms are pivotably mounted on the outer lever.
- At least one torsion spring is expediently positioned as a lost motion spring in the area of this bolt. This is supported at one end on a crossbar connecting the arms of the outer lever and acts at the other end on a stop of the inner lever, which is designed, for example, as a pin, which is located on an outer wall of the inner lever. If necessary, other lost motion springs such as coil springs and the like can also be applied.
- the outer lever can also be mounted on the inner lever in some other way. Here, for example, dome-shaped supports or fork-like interventions are intended.
- lever parts is made from a lightweight material such as sheet metal or fiber-reinforced plastic, a further contribution is made with regard to lightweight construction and reduction of the oscillating valve train masses.
- Figure 1 shows a spatial view of the towing device according to the invention
- Figure 2 is a plan view of the rocker arm of Figure 1;
- Figure 3 shows a section along the section line III-III of Figure 2 and
- Figure 1 discloses the rocker arm 1 according to the invention in a spatial representation.
- This consists of an outer lever 2 with two arms 3a, 3b. These are connected in the region of an (opposite) end 4 of the rocker arm 1 by a crossbar 5 on the cam side.
- An inner lever 6 runs between the arms 3a, 3b so as to be pivotable to the outer lever 2.
- This has an installation 8 in the region of one end 7 for a gas exchange valve (see also other figures).
- the inner lever 6 has a complementary surface 9 on an underside for bearing on a head of a preferably hydraulic support element.
- the inner lever 6 is penetrated by a transverse bolt 10 in the region of the end 4.
- the outer lever 2 has a bore 11 on each side of the end 4, into which ends 12 of the transverse bolt 10 protrude.
- a total of two torsion springs 13 run as lost motion springs between the inner lever 6 and the outer lever 2. These enclose the cross bolt 10 on both sides of the inner lever 6 and act on one end against the cross beam 5 and on the other end against a stop 14a which extends laterally from the inner lever 6. A permanent cam system of the outer lever 10 is thus ensured when the rocker arm 1 is switched off (low lift).
- the inner lever 6 Approximately in the area of a transverse center plane, the inner lever 6 has a rotatable roller as a contact surface 14 for a low-lift cam. An axial line of this roller is congruent with an axial line of coupling means 15 (see in particular FIG. 4) for the optional connection or disconnection of outer and inner levers 2, 6.
- the outer lever 2 on the other hand, has a sliding surface on its cam side on the arms 3a, 3b cam counter surface. Since, during firing of the internal combustion engine, the rocker arm 1 is predominantly operated in the low-lift mode and is thus decoupled, only the inner lever 6 communicating with the low-lift cam has a roller-mounted roller as a contact surface 14. For further advantages of the invention, reference is made to the introduction to the description at this point.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR0206425-1A BR0206425A (pt) | 2001-11-14 | 2002-10-22 | Alavanca de arrasto de um mecanismo de válvula de um motor de combustão interna |
EP02802982A EP1446562A1 (de) | 2001-11-14 | 2002-10-22 | Schlepphebel eines ventiltriebs einer brennkraftmaschine |
US10/840,656 US20040206324A1 (en) | 2001-11-14 | 2004-05-06 | Finger lever of a valve train of an internal combustion engine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10155825.2 | 2001-11-14 | ||
DE10155825A DE10155825A1 (de) | 2001-11-14 | 2001-11-14 | Schlepphebel eines Ventiltriebs einer Brennkraftmaschine |
US33562401P | 2001-11-15 | 2001-11-15 | |
US60/335,624 | 2001-11-15 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/840,656 Continuation US20040206324A1 (en) | 2001-11-14 | 2004-05-06 | Finger lever of a valve train of an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003042510A1 true WO2003042510A1 (de) | 2003-05-22 |
Family
ID=26010577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/011774 WO2003042510A1 (de) | 2001-11-14 | 2002-10-22 | Schlepphebel eines ventiltriebs einer brennkraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1446562A1 (de) |
BR (1) | BR0206425A (de) |
WO (1) | WO2003042510A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005093224A1 (en) * | 2004-03-03 | 2005-10-06 | Timken Us Corporation | Switching finger follower assembly |
WO2008052874A1 (de) * | 2006-10-31 | 2008-05-08 | Schaeffler Kg | Ventiltriebs-hebel für eine brennkraftmaschine |
CN100422513C (zh) * | 2004-03-03 | 2008-10-01 | 蒂姆肯公司 | 可切换的指状随动件组件 |
US10605126B2 (en) | 2018-04-17 | 2020-03-31 | Delphi Technologies Ip Limited | Switchable rocker arm |
US10704429B2 (en) | 2018-09-27 | 2020-07-07 | Delphi Technologies Ip Limited | Switchable rocker arm |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100867842B1 (ko) * | 2006-10-10 | 2008-11-10 | 현대자동차주식회사 | 자동차용 가변밸브리프트 팔로워 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4844023A (en) * | 1987-01-08 | 1989-07-04 | Honda Giken Kogyo Kabushiki Kaisha | Valve operating device for internal combustion engine |
EP0416628A1 (de) * | 1989-09-08 | 1991-03-13 | Nissan Motor Co., Ltd. | Kipphebelanordnung für verstellbaren Ventilantrieb |
DE19930574A1 (de) * | 1999-07-02 | 2001-01-04 | Schaeffler Waelzlager Ohg | Ventiltrieb einer Brennkraftmaschine |
EP1149988A2 (de) * | 2000-04-26 | 2001-10-31 | Delphi Technologies, Inc. | Verfahren und Vorrichtung für einen zweistufigen Nockenprofilwechsel |
US6314928B1 (en) * | 2000-12-06 | 2001-11-13 | Ford Global Technologies, Inc. | Rocker arm assembly |
-
2002
- 2002-10-22 BR BR0206425-1A patent/BR0206425A/pt not_active Application Discontinuation
- 2002-10-22 WO PCT/EP2002/011774 patent/WO2003042510A1/de not_active Application Discontinuation
- 2002-10-22 EP EP02802982A patent/EP1446562A1/de not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4844023A (en) * | 1987-01-08 | 1989-07-04 | Honda Giken Kogyo Kabushiki Kaisha | Valve operating device for internal combustion engine |
EP0416628A1 (de) * | 1989-09-08 | 1991-03-13 | Nissan Motor Co., Ltd. | Kipphebelanordnung für verstellbaren Ventilantrieb |
DE19930574A1 (de) * | 1999-07-02 | 2001-01-04 | Schaeffler Waelzlager Ohg | Ventiltrieb einer Brennkraftmaschine |
EP1149988A2 (de) * | 2000-04-26 | 2001-10-31 | Delphi Technologies, Inc. | Verfahren und Vorrichtung für einen zweistufigen Nockenprofilwechsel |
US6314928B1 (en) * | 2000-12-06 | 2001-11-13 | Ford Global Technologies, Inc. | Rocker arm assembly |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005093224A1 (en) * | 2004-03-03 | 2005-10-06 | Timken Us Corporation | Switching finger follower assembly |
CN100422513C (zh) * | 2004-03-03 | 2008-10-01 | 蒂姆肯公司 | 可切换的指状随动件组件 |
US7546822B2 (en) | 2004-03-03 | 2009-06-16 | Timken Us Corporation | Switching finger follower assembly |
WO2008052874A1 (de) * | 2006-10-31 | 2008-05-08 | Schaeffler Kg | Ventiltriebs-hebel für eine brennkraftmaschine |
US10605126B2 (en) | 2018-04-17 | 2020-03-31 | Delphi Technologies Ip Limited | Switchable rocker arm |
US10704429B2 (en) | 2018-09-27 | 2020-07-07 | Delphi Technologies Ip Limited | Switchable rocker arm |
Also Published As
Publication number | Publication date |
---|---|
EP1446562A1 (de) | 2004-08-18 |
BR0206425A (pt) | 2003-12-30 |
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