WO2003056144A1 - Valve operating unit for a fluid-operated variable valve drive on an internal combustion engine - Google Patents
Valve operating unit for a fluid-operated variable valve drive on an internal combustion engine Download PDFInfo
- Publication number
- WO2003056144A1 WO2003056144A1 PCT/EP2002/012647 EP0212647W WO03056144A1 WO 2003056144 A1 WO2003056144 A1 WO 2003056144A1 EP 0212647 W EP0212647 W EP 0212647W WO 03056144 A1 WO03056144 A1 WO 03056144A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- pressure chamber
- slave unit
- housing
- stage
- 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
- F01L1/14—Tappets; Push rods
- F01L1/16—Silencing impact; Reducing wear
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
Definitions
- the invention relates to a slave unit of a fluid-operated variable valve train of an internal combustion engine, consisting of a housing installed in a receptacle of a cylinder head, in the bore of which an axially movable slave piston runs, which cooperates with at least one gas exchange valve via a first end face, the second end face of which is a pressure chamber for the fluid delimits at one end, which extends in the direction of a bottom of the housing remote from the gas exchange valve, a passage for the fluid connecting the pressure chamber with a pressure chamber running in the region of the bottom, and wherein leakage gap means for braking the pressure chamber and the pressure chamber Valve placement speed are provided.
- Such a slave unit is previously known from EP 09 39 205 A1.
- This also consists of a housing with a slave piston in its bore runs. This is of two levels and has an approach on the cam side. The latter is part of leakage gap means for braking the valve speed.
- leakage gap means for braking the valve speed.
- it should be immersed in a complementary opening in the housing as a further component of the leakage clearing agent (see column 5 below).
- the slave piston has two jacket surfaces that are very precise and complex to manufacture due to its gradation. In this context, two bore surfaces must also be ground and coordinated.
- the leakage gap means have only a throttling character. There is therefore an undesirable viscosity-dependent delay in valve placement speed. For example, in the event of an extreme cold start of the internal combustion engine, it can happen that the gas exchange valve moves too slowly into its seat due to excessively high-viscosity oil and, in the worst case, remains open.
- the slave piston when the internal combustion engine is running hot, for example after prolonged operation under full load, the slave piston may be braked too little, wear and noise, due to oil that is too low in viscosity and large leakage gaps. It should also be noted (see FIG. 2) that several oblique bores are provided indirectly from a pressure chamber inside the housing into an outside pressure chamber. To produce these bores, an unnecessarily large manufacturing effort is necessary.
- the object of the invention is therefore to provide a slave unit of the aforementioned type, in which the disadvantages cited are eliminated with simple means.
- the leakage gap means are produced in two or more stages, at least one stage being designed as an aperture or similar to an aperture.
- the leakage gap means as an aperture or at least with an aperture character, a largely independent viscosity effect of the slave unit is produced.
- the person skilled in the art can thus set the desired braking effect by means of calculations and tests which are familiar to him.
- first stage of the leakage gap means is closed by the slave piston, only its second stage acts, which is designed as an aperture-like transition in the disk-like closing body of the check valve.
- the first stage consists of chamfer-like slots on an annular edge of the second end face of the slave piston, which opens into an annular groove on the valve side, an exact end of the braking effect of the first stage can be defined.
- the ring groove can always be applied relatively easily in terms of production technology at a precisely defined height section on the outer jacket of the slave piston.
- the lower edge of the ring groove, together with the channel in the housing, determines the braking end of the first stage.
- the check valve with the second stage is provided in particular on a disk-like closing body which, in an expedient embodiment of the invention, is produced as a cap with an annular collar.
- This, as well as a spring support for the closing body of the check valve which is also disc-shaped, advantageously consist of a thin-walled lightweight material such as sheet metal and are produced in a deep-drawing process.
- the channel communicating with the chamfer-like slots through the housing (expediently a plurality of channels are provided) has an arch-chord-like or secant-like course. This can be easily applied to the housing using a side milling cutter, for example.
- the hydraulic oil used for lubrication in the internal combustion engine is preferably proposed as the fluid.
- a separate circuit or a fluid such as brake fluid or the like is also conceivable.
- the slave unit is to be installed in a cam-controlled, electro-hydraulic valve train.
- valve drives for controlling a gas or liquid exchange are also conceivable which are not cam-driven, but are controlled, for example, by electromagnetic switching valves or similar components.
- FIGS. 1 to 4 disclose a slave unit according to the invention with a slave piston during the closing process
- the slave unit 1 consists of a housing 4 built into a receptacle 2 of a cylinder head 3 of an internal combustion engine.
- the housing 4 has a bore 5.
- a slave piston 6 extends axially movably in the bore 5. This has a first end face 7, which has at least one gas exchange valve in the Direction of stroke communicates
- a second end face 8 of the slave piston 6 delimits a pressure chamber 9 for fluid such as hydraulic oil in an axial direction
- an overflow 11 is applied for the flow medium.
- This means connects the pressure chamber 9 with a pressure chamber 12 for the flow medium by means to be mentioned later
- the housing 4 is screwed into the receptacle 2 and has additional sealing means 13 on its outer casing 13a
- a channel 1 leads from the bore 5 as a component of leakage gap means 15.
- an annular edge 16 of the slave piston 6 in the region of the second end face 8 has a plurality of circumferentially distributed slots 17 with an aperture-like geometry.
- the slots 17 open into an annular groove 18 on the valve side is on a defined height section on the outer jacket 19 of the Slave piston 6 positioned.
- the annular edge 16 and the annular groove 18 are a further component of the leakage gap means 15, here a first stage 20
- a disk-like welding body 21 is placed against the bottom 10. This has an annular collar 22 on the edge, which points in the valve direction.
- the collar 22 is spaced apart from the bore 5 of the housing 4. It has several perforations 23 distributed around the circumference for the passage of the flow medium recognize that the Schheßkorper 21 has a central passage 24 This is made as a sharp-edged diaphragm and forms a further component of the leakage gap means 15, here the second stage 26th
- the Schheßkorper 21 with annular collar 22 is acted upon by the force of a helical compression spring 27 in the direction of the floor 10 in the closing direction of its transition 11.
- the helical compression spring 27 is supported at the other end on a disk 28 which is designed with holes 29 for a Stromffenubert ⁇ tt.
- the disk forms 28 a component of a thin-walled, for example deep-drawn pot part 30, which is fastened with its wall 31 in one end region of the bore 5, near the transition 11.
- the components 21 (with ring collar 22), 27 and 30 form a check valve 32, here with a double function, since in passage body 21 passage 24 is applied with an aperture character
- FIG. 1 shows the slave piston 6 at its bottom dead center, ie at the tip of the cam, immediately before the closing movement begins in the pressure chamber 9 and the pressure chamber 12, which pressure chamber 12 at the other end is from one Not shown, cam-actuated master piston is limited, there is high pressure in the fluid. If this high pressure is switched off, for example, via an assigned switching valve during the cam sequence phase or immediately, the "sudden" closing movement of the slave piston 6 begins, generated by the force of the valve spring. The slave piston 6 moves in the direction to the floor 10
- the braking function according to the invention is absolutely necessary, particularly in the case of the “stroke cut-off” mentioned, as soon as the second end face 8 of the slave piston 6, as is shown in more detail in FIG.
- the first stage of decelerating the valve attachment speed begins (braking )
- the flow medium is only "pressed” via the slots 17 in the area of the ring edge 6 into the ring groove 18 and then flows via the channel 14 as a further component of the first stage 20 into the pressure chamber 12
- slits 17 provided with an aperture-like character have a relatively or largely viscosity-independent braking of the valve attachment speed in this step. Due to the relatively easy to manufacture annular groove 18, this can be adjusted very precisely as a control edge
- FIG. 3 shows the end of the first braking stage, since the outer jacket 19 of the slave piston 6 completely closes the channel 14 and therefore there is no longer any fluid contact between the pressure chamber 9 above it and the pressure chamber 12.
- This second stage 26 of the leakage clearing means 15 is active
- This second stage 26, as mentioned, consists of the diaphragm-like passage 24 in the disk-like body 21.
- the slave piston 6 moves with sufficient speed but is sufficiently damped with the subsequent gas exchange valve into the seat
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50206503T DE50206503D1 (en) | 2001-12-22 | 2002-11-13 | VALVE ACTUATING UNIT OF A FLUID-ACTIVATED VARIABLE VALVE DRIVE OF A COMBUSTION ENGINE |
AU2002340513A AU2002340513A1 (en) | 2001-12-22 | 2002-11-13 | Valve operating unit for a fluid-operated variable valve drive on an internal combustion engine |
EP02774779A EP1456509B1 (en) | 2001-12-22 | 2002-11-13 | Valve operating unit for a fluid-operated variable valve drive on an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10163824.8 | 2001-12-22 | ||
DE10163824A DE10163824A1 (en) | 2001-12-22 | 2001-12-22 | Slave unit of a fluid-operated variable valve train of an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003056144A1 true WO2003056144A1 (en) | 2003-07-10 |
Family
ID=7710770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/012647 WO2003056144A1 (en) | 2001-12-22 | 2002-11-13 | Valve operating unit for a fluid-operated variable valve drive on an internal combustion engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1456509B1 (en) |
AU (1) | AU2002340513A1 (en) |
DE (2) | DE10163824A1 (en) |
WO (1) | WO2003056144A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008025704A1 (en) * | 2006-08-30 | 2008-03-06 | Schaeffler Kg | Throttling valve for an internal combustion engine having electrohydraulic valve control |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004048071A1 (en) | 2004-10-02 | 2006-04-20 | Ina-Schaeffler Kg | Valve drive for a cam-operated lift valve |
DE102010006411A1 (en) | 2010-02-01 | 2011-08-04 | Schaeffler Technologies GmbH & Co. KG, 91074 | Hydraulic valve train for variable actuation of gas exchange valve of internal combustion engine, has piston cylinder unit with housing and piston axially guided into housing, where base and housing are combined into single component |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3119592A (en) * | 1960-02-10 | 1964-01-28 | Nuovo Pignone Spa | Apparatus for hydraulic control of the valves of an internal combustion engine or motor compressor |
EP0507521A1 (en) * | 1991-04-04 | 1992-10-07 | Ford Motor Company Limited | Hydraulic valve control system for internal combustion engines |
US5158048A (en) * | 1992-04-02 | 1992-10-27 | Siemens Automotive L.P. | Lost motion actuator |
US5485813A (en) * | 1995-01-11 | 1996-01-23 | Siemens Automotive Corporation | Lost motion actuator with damping transition |
US5577468A (en) * | 1991-11-29 | 1996-11-26 | Caterpillar Inc. | Engine valve seating velocity hydraulic snubber |
EP1091097A1 (en) * | 1999-10-06 | 2001-04-11 | C.R.F. Società Consortile per Azioni | Improvements to internal combustion engines with valve variable actuation |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5275136A (en) * | 1991-06-24 | 1994-01-04 | Ford Motor Company | Variable engine valve control system with hydraulic damper |
DE4315473A1 (en) * | 1993-05-10 | 1994-11-17 | Daimler Benz Ag | Timing device for valves of an internal combustion engine |
-
2001
- 2001-12-22 DE DE10163824A patent/DE10163824A1/en not_active Withdrawn
-
2002
- 2002-11-13 DE DE50206503T patent/DE50206503D1/en not_active Expired - Lifetime
- 2002-11-13 AU AU2002340513A patent/AU2002340513A1/en not_active Abandoned
- 2002-11-13 WO PCT/EP2002/012647 patent/WO2003056144A1/en not_active Application Discontinuation
- 2002-11-13 EP EP02774779A patent/EP1456509B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3119592A (en) * | 1960-02-10 | 1964-01-28 | Nuovo Pignone Spa | Apparatus for hydraulic control of the valves of an internal combustion engine or motor compressor |
EP0507521A1 (en) * | 1991-04-04 | 1992-10-07 | Ford Motor Company Limited | Hydraulic valve control system for internal combustion engines |
US5577468A (en) * | 1991-11-29 | 1996-11-26 | Caterpillar Inc. | Engine valve seating velocity hydraulic snubber |
US5158048A (en) * | 1992-04-02 | 1992-10-27 | Siemens Automotive L.P. | Lost motion actuator |
US5485813A (en) * | 1995-01-11 | 1996-01-23 | Siemens Automotive Corporation | Lost motion actuator with damping transition |
EP1091097A1 (en) * | 1999-10-06 | 2001-04-11 | C.R.F. Società Consortile per Azioni | Improvements to internal combustion engines with valve variable actuation |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008025704A1 (en) * | 2006-08-30 | 2008-03-06 | Schaeffler Kg | Throttling valve for an internal combustion engine having electrohydraulic valve control |
Also Published As
Publication number | Publication date |
---|---|
DE50206503D1 (en) | 2006-05-24 |
EP1456509B1 (en) | 2006-04-19 |
AU2002340513A1 (en) | 2003-07-15 |
EP1456509A1 (en) | 2004-09-15 |
DE10163824A1 (en) | 2003-07-03 |
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