EP0010768B1 - Dispositif hydraulique de rattrapage - Google Patents
Dispositif hydraulique de rattrapage Download PDFInfo
- Publication number
- EP0010768B1 EP0010768B1 EP79104279A EP79104279A EP0010768B1 EP 0010768 B1 EP0010768 B1 EP 0010768B1 EP 79104279 A EP79104279 A EP 79104279A EP 79104279 A EP79104279 A EP 79104279A EP 0010768 B1 EP0010768 B1 EP 0010768B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- hydraulic fluid
- hydraulic
- cylinder
- piston
- 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.)
- Expired
Links
Images
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
- F01L1/20—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
-
- 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
Definitions
- the invention relates to a hydraulic lash adjuster with a piston displaceably guided in a cylinder and a working space formed between the piston and the cylinder and a storage space arranged in the piston and / or in the cylinder and sealed to the outside in a pressure-tight manner, which is partly filled with an air cushion and partly with hydraulic fluid and in which an element preventing the foaming of air in hydraulic fluid is provided, the storage space being connected to the working space via a channel having a check valve and the working space being connected to the storage space via a throttle gap.
- Such hydraulic lash adjusters are used in particular for the control of the valves of internal combustion engines.
- US-A-2694388 and DE-A-2911550 show such a hydraulic lash adjuster, in which the storage space is sealed pressure-tight from the atmosphere.
- An air cushion is arranged and provided in the storage space, which is separated from the hydraulic fluid in the storage space by a membrane, a balloon body or the like forming a chamber for the air cushion.
- the membrane is designed to be liquid and airtight, so that the air cushion is kept effectively separate from the hydraulic fluid in the storage space at all times.
- the enclosed air cushion is suitable for briefly absorbing pressure peaks that occur and releasing them back to the hydraulic fluid in the reservoir if the work space needs to be refilled from the reservoir with the check valve open.
- the hydraulic fluid itself still contains a certain amount of air, which is always contained in the hydraulic fluid circuit and the disadvantages of which are not eliminated by the arrangement of the sealed air cushion.
- This proportion of air in the hydraulic fluid can be disadvantageously particularly high if, when filling the hydraulic lash adjuster, air is included outside the membrane in the storage space, which then necessarily foams up during operation of the compensating element and also enters the work space via the check valve.
- Another game compensation element shows the US-A-2096257.
- This is also an element in which the storage space is under atmospheric pressure, so that the desired effect of existing air as an air cushion or pressure accumulator does not occur.
- the storage space is deliberately partially filled with hydraulic fluid and partially with air, the hydraulic fluid being in direct, unimpeded communication with the air, so that the foaming process is in no way hindered.
- a filter is arranged, which has the task of separating the air foamed in the hydraulic fluid and preventing it from entering the work space.
- the filter has only a limited effectiveness with regard to its separation effect.
- the problem in the air dissolved in the hydraulic fluid is addressed in DE-A-2517370.
- the hydraulic fluid should flow completely into the work area and the storage room can be filled in freely.
- the storage space is largely liquid-tight on the outside, ie sealed by a hose section made of rubber-like material against the escape of liquid.
- the atmosphere or the oil pressure of the lubrication circuit acts on the outside of the hose section.
- there is no possibility of briefly absorbing and releasing pressure peaks in an air cushion but on the other hand the foaming of air within the storage space is effectively avoided.
- filling the compensating element with air-free hydraulic fluid requires certain precautions and great care.
- the invention has for its object to provide a self-sufficient lash adjuster, which is therefore independent of the foaming of the engine oil, so that neither an inflation nor an empty pumping of the working space occurs under operating conditions, in particular at high speeds.
- the known effect of an air cushion is to be used in an advantageous manner to absorb pressure peaks and to supplement the amount of leakage between the working space and the storage space with sufficient pressure drop during the short time available.
- the penetration of the hydraulic fluid mixed with air into the work area must be prevented, i.e. the liquid entering the work area must be largely free of air, i.e. may only contain air up to a certain limit.
- the element preventing the foaming is a filling made of packing elements which receive the air cushion finely distributed between them.
- This makes it possible to easily fill the lash adjuster with hydraulic fluid that contains a certain amount of air. A separate introduction of air is avoided.
- the arrangement of the filling made of packing elements at least some of the air is finely distributed and acts as an air cushion, between or in the filling elements, where it is largely removed in a fixed position.
- this air cushion is effectively prevented from foaming, since it is prevented by forces within the filling material from loosening and foaming in the hydraulic fluid.
- filling of fillers can fill the entire storage space. In general, however, it is already sufficient if part of the storage space is filled with a packing.
- the fillers can have an airtight and liquid-tight surface, that is to say, for example, consist of glass balls, plastic beads or the like.
- the size of the packing has a major influence on the retention of the finely divided air.
- the fillers can also be filled very easily into the otherwise pressure-tight storage space through the channel that connects the storage space with the work space.
- the fillers may consist of a sponge-like material which is impregnated with hydraulic fluid which forms the air cushion with its predetermined proportion of air.
- the 'shown in FIG. 1 hydraulic clearance compensation element consists essentially of two mutually displaceable parts, namely a piston 1 and an associated cylinder 2.
- the cylinder 2' itself is again slidably mounted to a respective housing part, which is not shown here.
- a reservoir 3 is provided in the cylinder 2 and is filled with hydraulic fluid.
- the storage space 3 is designed to be pressure-tight with respect to the atmosphere.
- a working space 5 is also provided, which is also filled with hydraulic fluid.
- a check valve 7 is switched on in the channel 6 between the storage space 3 and the working space 5.
- the piston 1 is supported relative to the cylinder 2 by a spring 8, which can also be provided elsewhere, but with the same effect.
- the connection from the working space 5 to the storage space 3 is established via a throttling gap 9 formed as an annular gap between the cylinder 2 and the piston 1.
- the circuit of the hydraulic fluid is therefore clear and with the help of the check valve 7 certainly.
- Hydraulic fluid 14 can only reach the working space 5 from the storage space 3 via the channel 6.
- hydraulic fluid 14 displaced from the working space 5 can only reach the storage space 3 via the throttle gap 9.
- the throttle gap 9 ends at an annular groove 10 with a bore 11 which connects to the storage space 3.
- an indented annular plate 21 is provided, both of which ensure that the storage space 3 is pressure-tight against the atmosphere.
- packing elements are provided either continuously or as a loose bed, which take up finely divided air in the form of an air cushion 13 between them, so that this air cannot separate from the packing elements 22 even at high acceleration forces and therefore does not foam.
- the air cushion 13 is sufficient to absorb and release pressure peaks and thus to act as described.
- FIG. 2 shows a hydraulic tappet, the storage space 3 of which is formed in the piston 1 and is provided with a filling of fillers 22 that completely occupies it, as has already been explained with reference to the tappet according to FIG. 1.
- the fillers 22 can be designed with a dense surface, i.e. represent airtight bodies, for example glass spheres, plastic beads or the like.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Braking Arrangements (AREA)
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT79104279T ATE980T1 (de) | 1978-11-03 | 1979-11-02 | Hydraulisches spielausgleichselement. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2847699A DE2847699C3 (de) | 1978-11-03 | 1978-11-03 | Hydraulisches Spielausgleichselement |
DE2847699 | 1978-11-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0010768A1 EP0010768A1 (fr) | 1980-05-14 |
EP0010768B1 true EP0010768B1 (fr) | 1982-05-05 |
Family
ID=6053770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79104279A Expired EP0010768B1 (fr) | 1978-11-03 | 1979-11-02 | Dispositif hydraulique de rattrapage |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0010768B1 (fr) |
AT (1) | ATE980T1 (fr) |
DE (1) | DE2847699C3 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100282194A1 (en) * | 2008-08-28 | 2010-11-11 | Toyota Jidosha Kabushiki Kaisha | Sealed-type lash adjuster |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0030781B1 (fr) * | 1979-12-05 | 1989-12-13 | Eaton Corporation | Poussoir hydraulique pour vanne à entrainement direct |
IT1129888B (it) * | 1980-11-21 | 1986-06-11 | Riv Officine Di Villar Perosa | Punteria idraulica con ripresa automatica di gioco per motori endotermici |
AU8851382A (en) * | 1981-12-28 | 1983-07-07 | Stanadyne Inc. | Hydraulic valve lifters |
DE3635110A1 (de) * | 1985-10-15 | 1987-04-16 | Honda Motor Co Ltd | Ventilsteuereinrichtung fuer eine brennkraftmaschine |
US4917059A (en) * | 1988-03-31 | 1990-04-17 | Nippon Seiko Kabushiki Kaisha | Valve lash adjuster |
DE4026793A1 (de) * | 1990-08-24 | 1992-03-05 | Freudenberg Carl Fa | Hydraulisches ventilspielausgleichselement fuer brennkraftmaschinen |
FR2677704B1 (fr) * | 1991-06-14 | 1995-02-17 | Renault | Dispositif hydraulique de rattrapage de jeu pour distribution de moteur a combustion interne. |
DE4203897C2 (de) * | 1992-02-11 | 1994-01-27 | Freudenberg Carl Fa | Hydraulisches Ventilspielausgleichselement |
DE4442932A1 (de) * | 1994-12-02 | 1996-06-05 | Schaeffler Waelzlager Kg | Hydraulisches Spielausgleichselement für eine Ventilsteuerung einer Brennkraftmaschine |
DE10010597A1 (de) * | 2000-03-03 | 2001-09-06 | Mahle Ventiltrieb Gmbh | Hydraulisches Spielausgleichselement, insbesondere für die Steuerung der Ladungswechselventile eines Verbrennungsmotors |
JP4680155B2 (ja) | 2005-11-08 | 2011-05-11 | トヨタ自動車株式会社 | 密封型ラッシュアジャスタ及び密封型ラッシュアジャスタの液体封入量調整方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2096257A (en) * | 1935-06-17 | 1937-10-19 | Moorhouse Alfred | Hydraulic valve tappet |
US2246330A (en) * | 1940-03-14 | 1941-06-17 | Eaton Mfg Co | Hydraulic tappet construction |
DE1911550A1 (de) * | 1969-03-07 | 1970-09-24 | Hanning Elektro Werke | Heizungsumwaelzpumpe |
DE2517370A1 (de) * | 1975-04-19 | 1976-10-28 | Volkswagenwerk Ag | Hydraulische spielausgleichsvorrichtung |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2109816A (en) * | 1935-12-21 | 1938-03-01 | Packard Motor Car Co | Hydraulic valve tappet |
US2246338A (en) * | 1938-11-17 | 1941-06-17 | Carrier Corp | Metering damper outlet |
US2694388A (en) * | 1950-12-30 | 1954-11-16 | Thompson Prod Inc | Self-contained hydraulic valve train length adjusting mechanism |
FR1251366A (fr) * | 1959-12-08 | 1961-01-20 | Perfectionnements apportés aux dispositifs de rattrapage automatique du jeu des soupapes commandées par came, notamment pour moteurs à combustion interne | |
US3025842A (en) * | 1961-02-06 | 1962-03-20 | Gen Motors Corp | Self-contained hydraulic lash adjuster |
US4274370A (en) * | 1978-03-23 | 1981-06-23 | Aisin Seiki Kabushiki Kaisha | Self-contained type lash adjuster |
-
1978
- 1978-11-03 DE DE2847699A patent/DE2847699C3/de not_active Expired
-
1979
- 1979-11-02 AT AT79104279T patent/ATE980T1/de active
- 1979-11-02 EP EP79104279A patent/EP0010768B1/fr not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2096257A (en) * | 1935-06-17 | 1937-10-19 | Moorhouse Alfred | Hydraulic valve tappet |
US2246330A (en) * | 1940-03-14 | 1941-06-17 | Eaton Mfg Co | Hydraulic tappet construction |
DE1911550A1 (de) * | 1969-03-07 | 1970-09-24 | Hanning Elektro Werke | Heizungsumwaelzpumpe |
DE2517370A1 (de) * | 1975-04-19 | 1976-10-28 | Volkswagenwerk Ag | Hydraulische spielausgleichsvorrichtung |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100282194A1 (en) * | 2008-08-28 | 2010-11-11 | Toyota Jidosha Kabushiki Kaisha | Sealed-type lash adjuster |
Also Published As
Publication number | Publication date |
---|---|
EP0010768A1 (fr) | 1980-05-14 |
DE2847699C3 (de) | 1982-03-04 |
ATE980T1 (de) | 1982-05-15 |
DE2847699A1 (de) | 1980-05-14 |
DE2847699B2 (de) | 1981-07-02 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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