EP0515771B1 - Poussoir de commande de soupape pour moteur à combustion interne - Google Patents
Poussoir de commande de soupape pour moteur à combustion interne Download PDFInfo
- Publication number
- EP0515771B1 EP0515771B1 EP92101924A EP92101924A EP0515771B1 EP 0515771 B1 EP0515771 B1 EP 0515771B1 EP 92101924 A EP92101924 A EP 92101924A EP 92101924 A EP92101924 A EP 92101924A EP 0515771 B1 EP0515771 B1 EP 0515771B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- tappet
- guide ring
- valve
- tappet according
- 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 - Lifetime
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
- F01L1/12—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
Definitions
- the invention relates to a tappet for the valve train of an internal combustion engine, consisting of an essentially cup-shaped housing which can be slipped onto the valve stem of a valve, the housing consisting at least in the radial direction on the outside of polymer material and in the radial direction on the outside at least at one point is enclosed by a guide ring.
- the outer guide part of the valve tappet for internal combustion engines comprises a base made of wear-resistant material which interacts with the cam of the camshaft and a hollow cylindrical shaft part made of a sprayable polymer material which slides in the guide bore of the cylinder head.
- a thin-walled reinforcement element drawn from sheet metal is provided, to which the base can be fastened and which is fixed in the radial direction on the inside in the shaft part.
- a tappet for valve control in particular for motor vehicle engines, which consists of a cylindrical sleeve made of plastic, one end of the sleeve being closed by a metal disk.
- the outer circumference of the sleeve which forms the sliding surface and can be moved to and fro in the axial direction in a guide bore in the cylinder head, exhibits increased wear in the region of its axial limits, particularly in the case of a long service life.
- a tappet which comprises a housing made of metallic material, which results in a high mass of the valve train to be accelerated.
- the mass of a valve train to be accelerated is a very critical quantity, into which the tappet mass is directly involved. Due to the comparatively high mass of the tappet, the valve spring is extremely heavily loaded, especially at higher speeds. In addition, the mass of the valve train to be accelerated also increases the wear in the area of the tappet guides and the housing base, on which the camshaft acts.
- the invention has for its object to show a plunger both in an open form with or without hydraulic valve lash compensation and a plunger in a closed form with hydraulic valve lash compensation, which reduces the forces acting in the valve train by a low mass, thereby reducing the load on the valve train Components reduced and, due to the lower wear, provides better performance characteristics over a longer service life.
- the plunger should be easy and inexpensive to manufacture.
- the object is achieved according to the invention in a plunger of the type mentioned in the introduction that the housing and the guide ring can be produced independently of one another, that the guide ring has a circumferential cut and that the guide ring is snapped into a guide groove of the housing under elastic pretension.
- the weight of all cup-shaped tappets can be significantly reduced, which means that with constant tappet acceleration, less force is exerted on the moving parts and therefore less wear, or with the same force, the tappet and the valve adjacent to it can be accelerated, which results in better filling of the Combustion chambers and thus an improved efficiency of the internal combustion engine results.
- the advantage here is that a high-quality and wear-resistant and therefore usually expensive material is only used where it is really necessary due to the wear that occurs.
- the main structure of the plunger can be made of inexpensive, light material, since there are no requirements for wear resistance of the base material outside the running surfaces and the other stressed zones. Due to the rotating movement of the cam, the tappet performs a not exclusively translatory movement. During the intended use of the plunger, tilting moments also occur, as a result of which the load along the running surface of the wooden cylinder part running in the axial direction is different. The greatest load in terms of wear lies in the area closest to the cam. The second highest load results in the area which is furthest away from the cam in the axial direction, while the area between these two points is the least loaded.
- the guide ring can consist of a polymer material with high wear resistance as well as a metallic material. Even when using a guide ring made of metallic material, there is only an insignificant increase in the mass of the ram to be accelerated due to the small thickness of the guide ring.
- the structural strength of the plunger is provided by the inexpensive plastic with a low specific weight, while the wear resistance and thus the good properties of use are ensured by the guide rings over a long period of use.
- the guide ring can be perforated and consist of stamped sheet steel, for example. It is inserted into the tool for producing the plunger and overmolded with plastic, so that the plastic of the base body fills the openings and transmits the thrust forces that occur during the intended use both by positive locking and by adhesion.
- the housing and / or the guide ring can be provided with lubricant pockets which are open outward in the radial direction.
- the treads on the outside in the radial and / or axial direction can be provided with a plasma coating.
- the tread of the tappet on the outside in the radial direction which is moved relative to the guide bore in the cylinder head, is subject to wear.
- the tread can be coated with a layer of wear-resistant material by means of a plasma coating, as a result of which the plunger is protected against wear. With an insignificant increase in the total mass compared to an uncoated but more prone to wear, the wear-critical surface would be protected.
- the housing can be formed in two parts and limited in the axial direction by a housing base made of a metallic or ceramic material. If the valve stem acts directly on the housing base, make sure that the housing base of the tappet is connected to the hollow cylindrical counterpart of the housing as a counter-rotor to the cam so that both compressive and tensile forces can be transmitted.
- the pressure on the housing base is exerted on pressure by the cam which is adjacent on the outside in the axial direction and which moves the tappet in the axial direction to open the valve.
- Tensile loads act on the case base by closing the inside to the housing bottom of the adjacent valve by the valve spring when it is supported on the one hand in the cylinder head and on the other hand in the tappet housing. This is usually supported on the one hand in the cylinder head and on the other hand in the tappet housing.
- Metallic or ceramic materials are particularly suitable for the housing base due to their good wear resistance and comparatively low thermal expansion.
- FIGS. 1 show the individual components of bucket tappets to be taken into account, both in open form with or without hydraulic valve lash adjustment and in closed form with hydraulic valve lash adjustment, partly in a schematic representation:
- Figures 1, 2, 3 and 4 show weight-optimized bucket tappets in an open form without hydraulic valve clearance compensation and / or individual components which are advantageous for advantageous usage properties.
- FIG. 5 shows a weight-optimized cup tappet in the closed form with hydraulic valve clearance compensation.
- the housing 1 consists at least in the radial direction on the outside of a polymeric material, the housing 1 being enclosed on the outside in at least one place in the radial direction with a guide ring 3.
- a weight-optimized tappet is shown, in an open form without hydraulic valve clearance compensation. Thereafter, it is provided that the housing 1 is formed in two parts, the axial running surface 1.2 being formed by a housing base 2 made of metallic or ceramic material.
- the Radial tread 1.1 is formed in the highly stressed areas of the housing 1 by guide rings which surround the housing 1 on the outside in the radial direction.
- the tappet has two comparatively highly stressed areas in the area of its radial running surfaces. Due to the tilting moments that act on the tappet due to the rotating camshaft, the areas that are subject to the highest stress are located most towards the housing base and away from the housing base. The stress between these two areas is less great.
- the tappet has a lower weight than previously known tappets because the base body of the housing 1 consists of a light, polymeric material.
- the guide rings 3 can, for example, also, like the housing base, consist of metallic material or be formed by a polymeric material which meets the requirements with regard to good performance characteristics over a long service life. Even when using particularly expensive materials or materials with a higher density and therefore a higher weight, such as metal, the total weight of the ram is hardly affected, since the corresponding amounts are only very small.
- FIG. 2 shows the basic body of the housing 1 with an inserted housing base 2.
- the guide grooves 4, in which the guide rings 3 according to FIG. 1 are fixed can be seen particularly well.
- the guide rings 3 can be fixed in the guide grooves 4 of the housing 1, for example, by snapping in and / or gluing.
- FIG. 3 A guide ring 3 according to FIG. 1 is shown in FIG. 3.
- the guide ring 3 has openings 3.1, which can be circular, for example.
- FIG. 4 shows a plunger similar to that described in FIG. 1, the radial running surface 1.1 being formed by a preformed plate which has a similar shape to the guide ring 3 shown in FIG. 3.
- the radial running surface 1.1 of the preformed plate can have openings, for example have or be designed consistently.
- the housing base 2 is as with the two-part tappets described so far connected to the base body of the housing 1 that it can transmit both compressive and tensile forces.
- FIG. 5 shows a cup tappet in closed form with hydraulic valve clearance compensation, the housing 1 of which, along its radial running surface 1.1, has guide rings 3 in the areas subject to greater stress, which are shown here without openings.
- Both the base body of the housing 1 and the guide part 5, which receives the displacement body 6 made of closed-cell foam, for example polyurethane or silicone, are formed by polymeric material. Due to the significantly larger number of moving parts compared to open cup tappets without hydraulic valve lash compensation, the use of polymeric materials for weight optimization of tappets is particularly advantageous in the case of components designed in this way.
- FIGS. 1 to 5 merely represent examples, the individual features of which can also be combined with one another.
- plasma-coated, radial treads are also conceivable, which are combined with a housing base 2 made of metallic or ceramic material.
- All guide rings can also be designed with or without openings and / or with or without lubricant pockets.
- the basic idea is, according to the respective requirements, to use different materials at different points in the housing in such a way that there is a substantial reduction in the tappet mass, which can either reduce the forces occurring in the valve train or, through greater accelerations, better filling and better efficiency the internal combustion engine can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Housings (AREA)
Claims (7)
- Poussoir de commande de soupape pour un moteur à combustion interne, constitué par un boîtier (1) ayant sensiblement la forme d'une cloche que l'on peut enfoncer sur la tige d'une soupape, le boitier (1) étant formé, au moins dans le sens radial et du côté extérieur, d'une matière polymère et étant entouré, dans le sens radial et à un endroit au moins de sa face externe, d'une bague de guidage (3), ce poussoir étant caractérisé en ce que le boîtier (1) et la bague de guidage (3) peuvent être fabriqués indépendamment l'un de l'autre, que la bague de guidage (3) est pourvue d'une découpure située sur sa circonférence et que la bague de guidage (3) est emboîtée, sous l'effet d'une précontrainte élastique, dans une rainure de guidage (4) du boîtier (1).
- Poussoir selon la revendication 1, caractérisé en ce que la bague de guidage (3) est formée d'une matière polymère particulièrement résistante à l'usure.
- Poussoir selon la revendication 1, caractérisé en ce que la bague de guidage (3) est formée d'une matière métallique.
- Poussoir selon les revendications 1 à 3, caractérisé en ce que la bague de guidage (3) est collée avec le boîtier (1).
- Poussoir selon les revendications 1 à 4, caractérisé en ce que le boitier (1) et/ou la bague de guidage (3) sont pourvus de poches à lubrifiant s'ouvrant vers l'extérieur dans le sens radial.
- Poussoir selon les revendications 1 à 5, caractérisé en ce que le boîtier (1) est pourvu, dans le sens radial et/ou dans le sens axial et du côté extérieur, de surfaces d'usure (1.1, 1.2) et que les surfaces d'usure (1.1, 1.2) sont formées par une couche de plasma.
- Poussoir selon les revendications 1 à 6, caractérisé en ce que le boîtier (1) est formé de deux parties et est limité, dans le sens axial, par un fond (2) en matière métallique ou céramique.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4117425A DE4117425C1 (fr) | 1991-05-28 | 1991-05-28 | |
DE4117425 | 1991-05-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0515771A1 EP0515771A1 (fr) | 1992-12-02 |
EP0515771B1 true EP0515771B1 (fr) | 1995-04-12 |
Family
ID=6432620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92101924A Expired - Lifetime EP0515771B1 (fr) | 1991-05-28 | 1992-02-05 | Poussoir de commande de soupape pour moteur à combustion interne |
Country Status (6)
Country | Link |
---|---|
US (1) | US5228418A (fr) |
EP (1) | EP0515771B1 (fr) |
JP (1) | JP2634988B2 (fr) |
AT (1) | ATE121165T1 (fr) |
DE (2) | DE4117425C1 (fr) |
ES (1) | ES2073791T3 (fr) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2678347B1 (fr) * | 1991-06-28 | 1994-01-14 | Ceramiques Composites | Poussoir de soupape a base d'un materiau plastique et eventuellement de ceramique. |
DE4203897C2 (de) * | 1992-02-11 | 1994-01-27 | Freudenberg Carl Fa | Hydraulisches Ventilspielausgleichselement |
DE4412298C2 (de) * | 1994-04-09 | 1996-05-23 | Daimler Benz Ag | Steuerkolben für eine Motorbremseinrichtung an einer Brennkraftmaschine |
DE9408058U1 (de) * | 1994-05-16 | 1994-07-14 | INA Wälzlager Schaeffler KG, 91074 Herzogenaurach | Stößel für einen Ventiltrieb einer Brennkraftmaschine |
JP3227634B2 (ja) * | 1994-11-16 | 2001-11-12 | フジオーゼックス株式会社 | 内燃機関用タペットおよびその製造方法 |
DE29501151U1 (de) * | 1995-01-25 | 1995-03-02 | INA Wälzlager Schaeffler KG, 91074 Herzogenaurach | Stößel mit einer geteilten Hemdfläche |
US5729900A (en) * | 1996-05-06 | 1998-03-24 | Fuji Oozx, Inc. | Method of manufacturing a tappet in an internal combustion engine |
JPH1077807A (ja) * | 1996-09-05 | 1998-03-24 | Fuji Oozx Inc | 内燃機関用タペットの製造方法 |
US5839402A (en) * | 1997-07-29 | 1998-11-24 | Fuji Oozx Inc. | Wear resistant tappet |
DE19958314A1 (de) * | 1999-12-03 | 2001-06-07 | Mahle Ventiltrieb Gmbh | Rollenstößel |
DE10358934A1 (de) * | 2003-12-12 | 2005-07-07 | Bayerische Motoren Werke Ag | Ventilstößel für Verbrennungsmotoren |
DE102005026504A1 (de) | 2005-06-09 | 2006-12-14 | Schaeffler Kg | Führungsleiste für den Ventiltrieb einer Brennkraftmaschine |
DE102006051256A1 (de) * | 2006-10-31 | 2008-05-08 | Schaeffler Kg | Ventiltriebs-Hebel für eine Brennkraftmaschine |
EP3176393B1 (fr) * | 2015-12-03 | 2018-06-13 | Aktiebolaget SKF | Dispositif de galet à contre-came avec espaceur et une meilleure résistance à l'usure |
US9822671B2 (en) | 2016-03-02 | 2017-11-21 | Ford Global Technologies, Llc | Composite hybrid cam carrier |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3545415A (en) * | 1967-04-08 | 1970-12-08 | Nippon Piston Ring Co Ltd | Valve lifter with thin plastic coating |
FR2129420A5 (fr) * | 1971-03-08 | 1972-10-27 | Cigala & Bertinetti Sas | |
DE2419330B2 (de) * | 1973-04-23 | 1975-02-20 | Union Carbide Corp., New York, N.Y. (V.St.A.) | Verfahren zur Herstellung von sprühbaren Uberzugspulvern feiner Teilchengröße |
JPS5266580A (en) * | 1975-11-29 | 1977-06-02 | Sumitomo Chemical Co | Method of powder coating of plastic article |
US4768476A (en) * | 1981-02-20 | 1988-09-06 | Stanadyne, Inc. | Tappet with ceramic camface |
JPS57153912A (en) * | 1981-03-17 | 1982-09-22 | Mazda Motor Corp | Pad for tappet of internal combustion engine |
JPS58185913A (ja) * | 1982-04-24 | 1983-10-29 | Yamaha Motor Co Ltd | 内燃機関の動弁装置 |
JPS58210308A (ja) * | 1982-05-31 | 1983-12-07 | Yamaha Motor Co Ltd | 動弁用タペツトの軽量化構造 |
US4430970A (en) * | 1982-06-11 | 1984-02-14 | Standard Oil Company (Indiana) | Composite tappet |
JPS60180969A (ja) * | 1984-02-28 | 1985-09-14 | 日本碍子株式会社 | エンジン部品およびその製造法 |
DE3409235A1 (de) * | 1984-03-14 | 1985-09-19 | Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt | Aeusseres fuehrungsteil fuer einen ventilstoessel fuer verbrennungskraftmaschinen |
DE3519015C2 (de) * | 1985-05-25 | 1996-04-11 | Schaeffler Waelzlager Kg | Ventilstößel für Verbrennungskraftmaschinen |
FR2584138B1 (fr) * | 1985-06-28 | 1989-08-04 | Inst Francais Du Petrole | Poussoir hydraulique comportant des parties ceramiques pour moteurs thermiques |
DE3627505C2 (de) * | 1986-08-13 | 1995-04-06 | Motomak | Sich selbsttätig hydraulisch einstellender Ventilstößel |
JPS63109151A (ja) * | 1986-10-27 | 1988-05-13 | Hitachi Ltd | 高硬度複合材およびその製造方法 |
JPH055202Y2 (fr) * | 1987-12-21 | 1993-02-10 | ||
US4909198A (en) * | 1988-03-01 | 1990-03-20 | Toyota Jidosha Kabushiki Kaisha | Aluminum alloy valve lifter with sprayed coating and method of producing same |
DE3809702A1 (de) * | 1988-03-23 | 1989-10-05 | Schaeffler Waelzlager Kg | Bauteil im ventilsteuertrieb einer brennkraftmaschine |
DE3814362C1 (en) * | 1988-04-28 | 1989-12-07 | Thyssen Guss Ag, 4330 Muelheim, De | Process for producing bucket tappets and similarly stressed components in internal combustion engines |
JPH02241913A (ja) * | 1989-03-13 | 1990-09-26 | Toyota Motor Corp | バルブリフタ |
GB9011125D0 (en) * | 1990-05-17 | 1990-07-04 | T & N Technology Ltd | Tappets |
-
1991
- 1991-05-28 DE DE4117425A patent/DE4117425C1/de not_active Expired - Lifetime
-
1992
- 1992-02-05 DE DE59201873T patent/DE59201873D1/de not_active Expired - Lifetime
- 1992-02-05 AT AT92101924T patent/ATE121165T1/de not_active IP Right Cessation
- 1992-02-05 EP EP92101924A patent/EP0515771B1/fr not_active Expired - Lifetime
- 1992-02-05 ES ES92101924T patent/ES2073791T3/es not_active Expired - Lifetime
- 1992-04-14 US US07/868,613 patent/US5228418A/en not_active Expired - Fee Related
- 1992-05-28 JP JP4136620A patent/JP2634988B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE4117425C1 (fr) | 1992-07-30 |
EP0515771A1 (fr) | 1992-12-02 |
DE59201873D1 (de) | 1995-05-18 |
ATE121165T1 (de) | 1995-04-15 |
US5228418A (en) | 1993-07-20 |
ES2073791T3 (es) | 1995-08-16 |
JPH05156905A (ja) | 1993-06-22 |
JP2634988B2 (ja) | 1997-07-30 |
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