WO1999036678A1 - Auf unterschiedliche hübe für wenigstens ein gaswechselventil schaltbarer nockenfolger eines ventiltriebs einer brennkraftmaschine - Google Patents
Auf unterschiedliche hübe für wenigstens ein gaswechselventil schaltbarer nockenfolger eines ventiltriebs einer brennkraftmaschine Download PDFInfo
- Publication number
- WO1999036678A1 WO1999036678A1 PCT/EP1998/006400 EP9806400W WO9936678A1 WO 1999036678 A1 WO1999036678 A1 WO 1999036678A1 EP 9806400 W EP9806400 W EP 9806400W WO 9936678 A1 WO9936678 A1 WO 9936678A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coupling means
- cam follower
- receptacle
- coupling
- cam
- 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
- 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
- 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
- F01L2307/00—Preventing the rotation of tappets
Definitions
- the invention relates to a cam follower of a valve train of an internal combustion engine that can be switched to different strokes for at least one gas exchange valve and has the following features:
- the cam follower consists of at least two adjacent sections which can be acted upon by cams of different strokes, one of which optionally does not interact with a cam;
- the sections preferably have receptacles aligned with one another in a cam base circle phase, a coupling means running in at least one of the receptacles, which is arranged completely in its receptacle when the sections are uncoupled;
- the coupling means is displaceable in its coupling direction by hydraulic means, which can be guided axially in front of its pressure-chamber-side end face via an inlet into a pressure chamber formed by its receptacle, it being displaceable for coupling the sections over a separating surface between them such that it engages with a partial section in the adjacent receptacle;
- Such a cam follower with a locking means is previously known from DE-OS 1 96 22 1 74.
- Its locking means is, for example, designed as a ball according to FIG. 8, which is designed to engage in a form-fitting manner in the coupling means produced as a piston.
- the ball projects above a receptacle for the coupling means in the camshaft direction.
- An attacking cam in turn has a partially recessed annular groove on its outer jacket, which interacts with the ball for the purpose of locking.
- the object of the invention is therefore to provide a cam follower of the type described above, in which the disadvantages shown are eliminated.
- the locking means is produced according to the invention as a mechanically lockable and unlockable, but hydraulically stable in its unlocked position by switching high pressure for the inlet into the pressure chamber and / or the locking means is completely installed in the cam follower and does not protrude beyond it.
- This locking and unlocking according to the invention is implemented in an embodiment of the invention via a signal path on the outer jacket of one of the sections. This means that there is no need for complex signal paths on the opposite cam. The wear otherwise found in this area is eliminated. At this point, however, it is also conceivable to position the signal path in the area of a surrounding construction for the cam follower (for example cylinder head).
- the locking means is held hydraulically in its unlocked position only at high switching pressure, it closes the inlet for the hydraulic medium into the pressure chamber in front of the coupling medium when the hydraulic medium pressure is insufficiently applied.
- the inlet is queried to determine whether a sufficiently high hydraulic medium pressure is present. If this is sufficient, after unlocking via the signal path, the slide is held or relocated via the applied hydraulic medium pressure in such a way that it releases a sufficient cross section at the inlet for displacing the coupling medium.
- the hydraulically preloaded coupling means is shifted with extremely high security and speed into its opposite receptacle for the coupling purpose of the sections (see also figure description).
- cam follower As a cup tappet.
- the scope of this invention relates to any other type of cam follower, particularly lever type cam followers such as rocker, rocker, or rocker arm pairs.
- cam followers are also conceivable in which three or more levers lie side by side are arranged and can be connected by coupling means for the purpose of different strokes.
- the coupling means of these levers can then also be provided with the locking means according to the invention.
- An end face of the coupling means on the pressure chamber side communicates according to the invention only in sections with an end face of the locking means on the pressure chamber side, so that the hydraulic medium can be passed sufficiently quickly via the signal path into the pressure chamber formed between them when this package is displaced.
- a compression spring is proposed, for example, as a spring means for acting on the locking means. At this point, however, any further spring means is conceivable, including magnetic or hydraulic loading of the locking means in the pressure chamber direction.
- the bucket tappet has a hydraulic play compensation element in the region of its circular section. This is advantageously acted upon by hydraulic fluid pressure via a separate hydraulic fluid path.
- the slide with a compression spring.
- the compression spring acts on the slide in the decoupling direction and, in the event of the desired decoupling when the pressure on hydraulic fluid decreases, causes the coupling means to be completely displaced into its receptacle.
- the force of this compression spring is designed stronger than the force of the compression spring acting on the locking means.
- this compression spring on the slide also prevents, via its spring force, that a coupling can be implemented in the event of insufficient switching high pressure on hydraulic medium.
- Another useful form of loading would be if an additional component, for example a further slide, runs in the receptacle diametrically opposite the receptacle for the blocking means. This can act on the slide in the decoupling direction via the above-mentioned loading means (hydraulic, mechanical) and optionally also form or include the stop.
- an additional component for example a further slide
- This can act on the slide in the decoupling direction via the above-mentioned loading means (hydraulic, mechanical) and optionally also form or include the stop.
- the cited spring means for the locking means is designed in such a way that it allows this locking means to be displaced into its unlocking direction via hydraulic medium pressure when this pressure is less than the switching high pressure, but greater than a low pressure of hydraulic medium.
- the receptacle for the coupling means and the diametrically opposite receptacle in the annular section each have a stop for the coupling means and the slide radially on the outside.
- This stop defines the maximum displacement movement of the elements just mentioned.
- the stops can be provided with openings, for example bores. Air displaced by blocking means or slide can escape through these bores during the movement of the coupling means. chen. No unwanted air cushion forms. A leakage amount of hydraulic fluid can also be removed from the cam follower.
- the signal path in one piece to the circular section.
- a separate element with a wedge surface such as a rivet-like body or the like, can also be connected to an outer jacket of the corresponding section.
- the signal path advantageously has its highest elevation in the region of the maximum relative position of the sections to one another.
- the coupling medium can be provided with hydraulic medium pressure in the event of its desired coupling. If this pressure is not sufficient (switching high pressure), the blocking means closes the inlet via the force of its pressure medium.
- a coupling can only take place in one of the following basic circle cycles.
- FIG. 2 shows a cross section through the cam follower rotated by 90 ° with respect to FIG. 1.
- Figure 1 shows a cam follower 1 designed as a tappet.
- This consists of an outer annular section 2, which in the area of its bore 3 includes a circular section 4 that is relatively movable relative to the latter.
- the sections 2, 4 are in the area of their bottoms 5, 6 of cams different strokes applied.
- the bottom 5 is contacted by at least one cam with a large stroke and the bottom 6 is contacted by a cam with a small stroke.
- the section 4 is provided on its side remote from the ground with a hydraulic play compensation element 7. This acts on one or more gas exchange valves, not shown.
- receptacles 8, 9 run in a cam base circle phase.
- a pressure medium 10 shown as a compression spring, is positioned radially on the outside.
- the pressure medium 10 is supported radially outwards on a stop 11.
- This stop 11 is formed here as the bottom of a sleeve 12.
- This sleeve 12 is used with its bore to form the receptacle 8 and thus as an immediate career.
- the stop 11 has an opening 13.
- the pressure medium 10 acts radially on the inside on a locking means / a locking slide 14. This is made like a piston.
- a coupling means 15 designed as a piston is arranged upstream of the blocking means 14 radially inwards. In the view shown here, a radially inner end face 16 of the blocking means 14 bears in sections against a radially outer end face 17 of the coupling means 15.
- the coupling means 15 is positioned with its radially inner end face 18 in the decoupled state of the sections 2, 4 immediately in front of a separating surface 19 between them.
- a pressure chamber 20 is formed between the locking means 14 and the coupling means 1 5 in the low-pressure state shown here and explained later.
- the blocking means 14 with its lateral surface 21 blocks an inlet 22 here.
- This inlet 22 serves to supply hydraulic Likstoff in the pressure chamber 20. It is fed here from a storage room 23 shown in Figure 2.
- a slide 25 extends within the receptacle 9 and extends over an entire length of the receptacle 9.
- the slide 25 is enclosed on its outer jacket 26 by a compression spring 27 approximately in the region of its transverse median plane. This extends between the sleeves 24.
- the compression spring 27 is supported on its side facing away from the coupling means 15 on a shoulder 28 (end face) of the sleeve 24. On the pressure chamber side, the compression spring 27 experiences a stop on a collar 29, which is located on the outer jacket 26 of the slide 25.
- the compression spring 27 holds the slide 25 in the central position.
- a circlip would also be conceivable.
- the part of the receptacle 8, which is diametrically opposite the receptacle 8 for the coupling means 15, has a sleeve-like stop 31. This also has an opening 32. It may also be conceivable to position a third slide within the receptacle 8 just described. This could then be acted upon radially from the outside by a pressure medium. Through the openings 13 and 32, displaced air can escape unhindered during a movement of the coupling means 15 / locking slide 14 and slide 25.
- a signal path 34 is formed on the outer jacket 33 of section 4 enclosed by the bore 3.
- This signal path 34 is produced as a diameter widening 35 which extends in the direction remote from the cam. It consists of a separate body 36, e.g. B. rivet-like training. It is located axially from a center of the end face 18 of the coupling means 15 approximately to the extent of a maximum differential stroke from the stroke of the large cam for the annular section 2 to the stroke of the small cam for the circular section 4. How it works:
- the figures show the cam follower 1 in its base circle phase and in the decoupled state.
- the associated gas exchange valve would thus only open in the sense of the cam acting on the circular section 4.
- the circular section 2 executes a relative movement to the circular section 4 in the sense of its cam or the large stroke cam.
- the end face 18 of the coupling means 15 remote from the pressure chamber slides on the outer jacket 33 and over the signal path 34.
- the lateral surface 21 of the locking means 14 temporarily releases the inlet 22. If the decoupling state is now to be maintained, for example at low engine speed and engine load, the low pressure of hydraulic fluid at the inlet 22 remains switched.
- the pressure medium 10 shifts the locking slide 14 radially inward.
- the coupling means 15 is in front of the separating surface 19.
- the inlet 22 is thus closed again. If there are undesirable pressure peaks in the hydraulic fluid at the inlet 22 in the cam base circle, these are disregarded by the locking action of the locking means 14.
- the coupling means 1 5 cannot undesirably extend in the coupling direction in the cam base circle phase and thus remains in its receptacle 8.
- a high pressure of hydraulic fluid can be applied to the inlet 22 very early on. If the package, consisting of coupling means 15 and blocking means 14, is now moved radially outward via signal path 34 with a relative stroke, the cross section of inlet 22 is again mechanically released. If the applied pressure (high pressure) of hydraulic medium exceeds a force predetermined by the pressure medium 10, the pressure chamber 20 remains open via this hydraulic medium pressure on the subsequent trailing edge of the cam. The coupling means 1 5 is therefore under sufficient pressure and can reach the base circle be immediately moved into the aligned receptacle 9. The coupling of the
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 |
---|---|---|---|
US09/600,508 US6273041B1 (en) | 1998-01-17 | 1998-10-09 | Cam follower in a valve train of an internal combustion engine switchable between different lifts for at least one gas-exchange valve |
DE19882103T DE19882103D2 (de) | 1998-01-17 | 1998-10-09 | Auf unterschiedliche Hübe für wenigstens ein Gaswechselventil schaltbarer Nockenfolger eines Ventiltriebs einer Brennkraftmaschine |
JP2000540360A JP2002509219A (ja) | 1998-01-17 | 1998-10-09 | 内燃機関の弁駆動機構の、少なくとも1つのガス切換弁のための異なる行程に切換可能なカムフォロワー |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19801603.4 | 1998-01-17 | ||
DE19801603A DE19801603A1 (de) | 1998-01-17 | 1998-01-17 | Auf unterschiedliche Hübe für wenigstens ein Gaswechselventil schaltbarer Nockenfolger eines Ventiltriebs einer Brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999036678A1 true WO1999036678A1 (de) | 1999-07-22 |
WO1999036678A8 WO1999036678A8 (de) | 2004-02-19 |
Family
ID=7854882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/006400 WO1999036678A1 (de) | 1998-01-17 | 1998-10-09 | Auf unterschiedliche hübe für wenigstens ein gaswechselventil schaltbarer nockenfolger eines ventiltriebs einer brennkraftmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US6273041B1 (de) |
JP (1) | JP2002509219A (de) |
CN (1) | CN1097669C (de) |
DE (2) | DE19801603A1 (de) |
WO (1) | WO1999036678A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19957165A1 (de) * | 1999-11-27 | 2001-06-07 | Porsche Ag | Ventilsteuerung für eine Brennkraftmaschine |
DE10201805A1 (de) * | 2002-01-18 | 2003-07-31 | Ina Schaeffler Kg | Schaltbarer Nockenfolger oder schaltbares Abstützelement eines Ventiltriebs einer Brennkraftmaschine |
US20050188930A1 (en) * | 2004-02-18 | 2005-09-01 | Best Richard R. | Valve deactivation device |
DE102005017409A1 (de) * | 2005-04-15 | 2006-10-19 | Schaeffler Kg | Außenteil eines schaltbaren Tassenstößels |
KR100980866B1 (ko) * | 2007-12-14 | 2010-09-10 | 현대자동차주식회사 | 가변 밸브 리프트 장치 |
DE102008062178A1 (de) * | 2008-12-13 | 2010-06-17 | Schaeffler Kg | Schaltbarer Tassenstößel |
DE102008062185A1 (de) * | 2008-12-13 | 2010-06-17 | Schaeffler Kg | Schaltbarer Tassenstößel |
KR101209743B1 (ko) * | 2010-09-14 | 2012-12-07 | 현대자동차주식회사 | 가변 밸브 리프트 장치 |
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 |
FR2979945B1 (fr) | 2011-09-12 | 2016-05-06 | Valeo Systemes De Controle Moteur | Systeme de transmission du mouvement d'au moins deux cames a au moins une soupape |
FR2980518B1 (fr) | 2011-09-26 | 2015-06-19 | Valeo Sys Controle Moteur Sas | Systeme de transmission du mouvement de cames a une soupape |
CN109113828B (zh) * | 2018-08-09 | 2020-09-15 | 襄阳美标朗源动力实业有限公司 | 一种发动机气缸气门组 |
US11353123B2 (en) | 2021-04-29 | 2022-06-07 | Cool Valve, Llc | Valve cartridges |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4327905A1 (de) * | 1993-08-19 | 1995-02-23 | Bayerische Motoren Werke Ag | Stößelvorrichtung für variable Hubsteuerungen eines Ventils, insbesondere eines Gaswechselventils einer Brennkraftmaschine |
DE19642718A1 (de) * | 1996-10-16 | 1998-04-23 | Schaeffler Waelzlager Ohg | Stößel für einen Ventiltrieb einer Brennkraftmaschine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4436952A1 (de) * | 1994-10-15 | 1996-04-18 | Schaeffler Waelzlager Kg | Schaltbarer Stößel eines Ventiltriebs einer Brennkraftmaschine |
JPH08158832A (ja) * | 1994-11-30 | 1996-06-18 | Aisin Seiki Co Ltd | エンジンの動弁装置 |
DE19528505A1 (de) * | 1995-08-03 | 1997-02-06 | Schaeffler Waelzlager Kg | Vorrichtung zur wahlweisen Betätigung zumindest eines Gaswechselventils |
DE19622174A1 (de) * | 1995-12-13 | 1997-06-26 | Porsche Ag | Ventiltrieb einer Brennkraftmaschine |
-
1998
- 1998-01-17 DE DE19801603A patent/DE19801603A1/de not_active Withdrawn
- 1998-10-09 JP JP2000540360A patent/JP2002509219A/ja active Pending
- 1998-10-09 WO PCT/EP1998/006400 patent/WO1999036678A1/de active Application Filing
- 1998-10-09 CN CN98813156A patent/CN1097669C/zh not_active Expired - Fee Related
- 1998-10-09 US US09/600,508 patent/US6273041B1/en not_active Expired - Fee Related
- 1998-10-09 DE DE19882103T patent/DE19882103D2/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4327905A1 (de) * | 1993-08-19 | 1995-02-23 | Bayerische Motoren Werke Ag | Stößelvorrichtung für variable Hubsteuerungen eines Ventils, insbesondere eines Gaswechselventils einer Brennkraftmaschine |
DE19642718A1 (de) * | 1996-10-16 | 1998-04-23 | Schaeffler Waelzlager Ohg | Stößel für einen Ventiltrieb einer Brennkraftmaschine |
Also Published As
Publication number | Publication date |
---|---|
CN1097669C (zh) | 2003-01-01 |
CN1286740A (zh) | 2001-03-07 |
WO1999036678A8 (de) | 2004-02-19 |
US6273041B1 (en) | 2001-08-14 |
JP2002509219A (ja) | 2002-03-26 |
DE19801603A1 (de) | 1999-07-22 |
DE19882103D2 (de) | 2000-11-30 |
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