WO1996034185A1 - Nockenfolger eines ventiltriebs einer brennkraftmaschine - Google Patents
Nockenfolger eines ventiltriebs einer brennkraftmaschine Download PDFInfo
- Publication number
- WO1996034185A1 WO1996034185A1 PCT/EP1996/001227 EP9601227W WO9634185A1 WO 1996034185 A1 WO1996034185 A1 WO 1996034185A1 EP 9601227 W EP9601227 W EP 9601227W WO 9634185 A1 WO9634185 A1 WO 9634185A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic pressure
- internal combustion
- combustion engine
- coupling means
- cam follower
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
-
- 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
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
- F01L1/25—Hydraulic tappets between cam and valve stem
-
- 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
- F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
-
- 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
- F01L2307/00—Preventing the rotation of tappets
Definitions
- the invention relates to a cam follower of a valve drive of an internal combustion engine or a support element for a rocker arm with means for switching to at least two different lifting heights of at least one gas exchange valve, consisting of an inner and an outer element, which are axially inserted into one another, which are connected radially or secant-like coupling means can be coupled to one another at least indirectly, a large valve lift being achieved when the two elements are coupled and a small valve lift being achieved when the elements are decoupled, and the coupling means coupling the elements under the force of a spring means and decoupling them under hydraulic pressure .
- Such a cam follower is known from DE-GM 93 1 5 436.4.
- This switching principle therefore proves to be useful on cam followers or supporting elements that can be switched off, since all cylinders are used at the start when the internal combustion engine is fired or re-fired. It is therefore only necessary for the starting process, which is based on an idling speed, to have both sections coupled, so that the respective valve opens in the sense of the cam with a longer stroke and a proper charge change can be carried out.
- both tappet sections are to be decoupled, ie the coupling elements are displaced in the decoupling direction against spring force by means of hydraulic medium pressure.
- the hydraulic pressure must be reduced so that the coupling means are moved into their coupling position.
- the lash adjuster since at these speeds the lash adjuster has a relatively high hydraulic pressure requirement, caused by the increasing foaming of the hydraulic medium at higher speeds, it must be switched from a relatively high hydraulic pressure, which keeps the coupling means in the decoupling position, to a lower hydraulic pressure.
- this low hydraulic pressure must be sufficient at the speeds normally driven to optimally supply the play compensation element (for example 2 to 2.5 bar). It is therefore necessary to locate the unlocking pressure of the hydraulic medium above the value just mentioned.
- a hydraulic pump would therefore have to be provided, which generates very high hydraulic pressures even when idling up to the lower part-load range. This cannot be achieved with conventional oil pumps.
- the spring forces which act on the coupling means against hydraulic pressure for the desired coupling state of the units would then also have to be selected to be extremely high. There are limits here simply because of the space available in the cam follower.
- the invention is therefore based on the object of creating a cam follower of the type mentioned at the outset, in which the disadvantages indicated are eliminated and in particular a coupling and decoupling device is created for its two elements, in which the hydraulic pressure or spring forces of the respective elements are low desired coupling state is established and at the same time an optimal supply of its play compensation element is ensured over the entire speed range.
- this object is achieved by the characterizing part of claim 1 in that, starting from the outer element, two separate paths for loading and supplying the coupling means or a hydraulic play compensation device in the inner element each run such that the force of the spring means is designed in such a way that a decoupling counter-spring force is realized at a hydraulic pressure that is less than or equal to a minimum required hydraulic pressure for supplying the lash adjuster at the operating temperature of the internal combustion engine, a switching valve being arranged upstream of the path of the coupling means, through which the internal combustion engine runs and runs when the engine is warming up (operating temperature) this is reduced in the partial or full load range of the hydraulic pressure in the path to a level which is below and at a distance from the hydraulic pressure which serves to displace the coupling means for decoupling the elements, so that there is a coupling to both elements.
- the hydraulic pressure supply of the coupling means and the play compensation device is designed separately in the cam follower or support element and, at the same time, a switching valve is arranged upstream of the path for the application of the coupling means, it is possible for the first time to apply extremely low switching pressures to the coupling means, with the play compensation device at the same time supply is optimally supplied across the entire speed range. It is guaranteed by the design of the spring (relatively weak) that at idle speed of the internal combustion engine up to a partial load range this (for example 3,000 rpm) a decoupling of the two sections can be established.
- the spring means which move the coupling means in the coupling direction, are designed such that the coupling means are displaced in the decoupling direction at a hydraulic pressure from 0.47 to about 0.6 bar.
- the switching valve in the switched state of the units reduces the hydraulic pressure to approximately 0.1 bar in the path upstream of the coupling means.
- the switchable cam follower described here is intended to be used in particular in valve drives with selective cylinder deactivation, such as can be implemented, for example, on V engines, but is also on Individual valve shutdowns in multi-valve technology, for example on intake valves, are intended.
- FIG. 3 shows the pressure curve in the path in front of the coupling means and the play compensation device against the speed in the diagram.
- cam follower 1 shows a cam follower 1. This is designed as a cup-shaped tappet, but can also be viewed as a supporting element.
- the cam follower 1 consists of an inner and outer element 2, 3. Both elements 2, 3 are inserted concentrically into one another. Radially displaceable coupling means 4 run in the bottom area of these elements 2, 3, as can be seen in FIG. 2. In this embodiment, these coupling means 4 are arranged in the outer element 3 and radially in the coupling direction via the force of at least one spring means 5 each relocatable from outside to inside. At least one cam with a large stroke acts on an annular bottom 6 of the outer element 3, a circular bottom 7 of the inner element 2 being acted upon by a cam with a smaller stroke or O-stroke.
- a coupling of both elements 2, 3 via the coupling means 4 via spring force against hydraulic pressure results in a transmission of the stroke of the cam large stroke via the outer element 3 and the inner element 2 to at least one gas exchange valve, not shown.
- the outer element 3 performs an idle stroke in relation to the inner element 2.
- the gas exchange valve opens in the sense of the stroke of the cam with a smaller stroke.
- the force of the spring means 5 is designed so that a decoupling against spring force is realized at a hydraulic pressure that is about 0.47 to 0.6 bar at idle speed of the internal combustion engine (see Figure 3).
- the graph O ⁇ Z I , 2 now indicates the pressure increase in hydraulic medium in the path in front of the coupling means 4 and the lash adjuster 10. From a speed n 2 of approximately 3,000 rpm, the hydraulic pressure in path 9 is increased to approximately by a switching valve 1 reduced to 0.1 bar (O ⁇ 2 ). The coupling means 4 are thus shifted into the coupling position via the force of their spring means 5. From this speed range, the gas exchange valve opens completely.
- the lash adjuster 10 is optimally supplied with hydraulic pressure via the separate path 8, as listed in the introduction to the description. If, during further operation of the internal combustion engine (warm-up precluded), the operating speed drops below 3,000 rpm, for example to 2,000 rpm, the switching valve 11 again releases the unthrottled hydraulic pressure in path 9. The coupling means 4 are thus shifted into their uncoupling position and the gas exchange valve only opens in the sense of the cam with a small stroke, which acts on the circular base 7.
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 (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019970707539A KR100332244B1 (ko) | 1995-04-26 | 1996-03-21 | 내연기관의 밸브 드라이브의 캠 폴로워 |
DE19680280A DE19680280C1 (de) | 1995-04-26 | 1996-03-21 | Nockenfolger oder Abstützelement für einen Schlepphebel eines Ventiltriebs einer Brennkraftmaschine |
DE19680280D DE19680280D2 (de) | 1995-04-26 | 1996-03-21 | Nockenfolger eines Ventiltriebs einer Brennkraftmaschine |
US08/930,529 US5823151A (en) | 1995-04-26 | 1996-03-21 | Valve gear cam follower in an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19515284A DE19515284A1 (de) | 1995-04-26 | 1995-04-26 | Nockenfolger eines Ventiltriebs einer Brennkraftmaschine |
DE19515284.0 | 1995-04-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996034185A1 true WO1996034185A1 (de) | 1996-10-31 |
Family
ID=7760380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/001227 WO1996034185A1 (de) | 1995-04-26 | 1996-03-21 | Nockenfolger eines ventiltriebs einer brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
US (1) | US5823151A (de) |
KR (1) | KR100332244B1 (de) |
DE (2) | DE19515284A1 (de) |
WO (1) | WO1996034185A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19705726A1 (de) * | 1997-02-14 | 1998-08-20 | Schaeffler Waelzlager Ohg | Ventiltrieb einer Brennkraftmaschine |
DE19728100B4 (de) * | 1997-07-02 | 2005-11-10 | Ina-Schaeffler Kg | Schaltbarer Stößel für einen Ventiltrieb einer Brennkraftmaschine |
DE10123966A1 (de) * | 2001-05-17 | 2002-11-21 | Ina Schaeffler Kg | Tassenstößel |
US6600989B2 (en) * | 2001-05-24 | 2003-07-29 | Delphi Technologies, Inc. | Apparatus and method for early intake valve closing |
US6615129B2 (en) * | 2001-05-24 | 2003-09-02 | Delphi Technologies, Inc. | Apparatus and method for two-step intake phased engine control system |
US20050183638A1 (en) * | 2004-02-21 | 2005-08-25 | Lin Austin S. | Snap on table for torchiere lamps and other supports |
DE102004036108A1 (de) * | 2004-07-24 | 2006-02-16 | Ina-Schaeffler Kg | Periodisch beaufschlagbarer Stößel für einen Ventil- oder Pumpentrieb |
DE102004056457A1 (de) * | 2004-11-23 | 2006-06-08 | Schaeffler Kg | Tassenstößel für eine Brennkraftmaschine |
DE102005017409A1 (de) * | 2005-04-15 | 2006-10-19 | Schaeffler Kg | Außenteil eines schaltbaren Tassenstößels |
US8312852B2 (en) | 2009-12-04 | 2012-11-20 | Hyundai Motor Company | Variable tappet |
US20120137995A1 (en) * | 2010-12-01 | 2012-06-07 | Kia Motors Corporation | Direct acting variable valve lift apparatus |
KR101251478B1 (ko) * | 2010-12-03 | 2013-04-05 | 기아자동차주식회사 | 직동식 cda 기구 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0494405A (ja) * | 1990-08-08 | 1992-03-26 | Ntn Corp | 可変バルブタイミング装置 |
DE4314619A1 (de) * | 1993-05-04 | 1994-11-10 | Schaeffler Waelzlager Kg | Stößel |
JPH07317518A (ja) * | 1993-08-25 | 1995-12-05 | Otix:Kk | 内燃機関の休止機構付き動弁機構 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0515520B2 (de) * | 1990-02-16 | 1998-04-29 | Group Lotus Limited | Ventilsteuervorrichtung |
AU657040B2 (en) * | 1992-02-28 | 1995-02-23 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Valve-moving apparatus for internal combustion engine |
DE4213856C2 (de) * | 1992-04-27 | 1994-08-04 | Iav Motor Gmbh | Ventiltrieb für Ladungswechselventile, von Hubkolbenbrennkraftmaschinen |
US5555861A (en) * | 1992-04-27 | 1996-09-17 | Iav Motor Gmbh | Drive for gas exchange valves, preferably inlet valves for reciprocating internal combustion engines |
DE4221134C1 (de) * | 1992-06-27 | 1993-07-01 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
US5361733A (en) * | 1993-01-28 | 1994-11-08 | General Motors Corporation | Compact valve lifters |
DE4303789C2 (de) * | 1993-02-10 | 1995-01-05 | Iav Motor Gmbh | Schaltbare Mitnehmereinrichtung für gegeneinander schiebbare Hubübertragungselemente |
DE4333927A1 (de) * | 1993-10-05 | 1995-04-06 | Schaeffler Waelzlager Kg | Schaltstößel |
DE9315436U1 (de) * | 1993-10-13 | 1993-12-23 | INA Wälzlager Schaeffler KG, 91074 Herzogenaurach | Nockenfolger |
DE9319435U1 (de) * | 1993-12-17 | 1994-02-10 | INA Wälzlager Schaeffler KG, 91074 Herzogenaurach | Schaltbares Abstützelement |
-
1995
- 1995-04-26 DE DE19515284A patent/DE19515284A1/de not_active Withdrawn
-
1996
- 1996-03-21 KR KR1019970707539A patent/KR100332244B1/ko not_active IP Right Cessation
- 1996-03-21 WO PCT/EP1996/001227 patent/WO1996034185A1/de active IP Right Grant
- 1996-03-21 US US08/930,529 patent/US5823151A/en not_active Expired - Lifetime
- 1996-03-21 DE DE19680280A patent/DE19680280C1/de not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0494405A (ja) * | 1990-08-08 | 1992-03-26 | Ntn Corp | 可変バルブタイミング装置 |
DE4314619A1 (de) * | 1993-05-04 | 1994-11-10 | Schaeffler Waelzlager Kg | Stößel |
JPH07317518A (ja) * | 1993-08-25 | 1995-12-05 | Otix:Kk | 内燃機関の休止機構付き動弁機構 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 16, no. 328 (M - 1281) 16 July 1992 (1992-07-16) * |
Also Published As
Publication number | Publication date |
---|---|
KR100332244B1 (ko) | 2002-08-14 |
DE19515284A1 (de) | 1996-10-31 |
US5823151A (en) | 1998-10-20 |
KR19990008015A (ko) | 1999-01-25 |
DE19680280C1 (de) | 2001-11-29 |
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