EP0663515A1 - Dispositif de compensation du jeu des soupapes - Google Patents
Dispositif de compensation du jeu des soupapes Download PDFInfo
- Publication number
- EP0663515A1 EP0663515A1 EP94119725A EP94119725A EP0663515A1 EP 0663515 A1 EP0663515 A1 EP 0663515A1 EP 94119725 A EP94119725 A EP 94119725A EP 94119725 A EP94119725 A EP 94119725A EP 0663515 A1 EP0663515 A1 EP 0663515A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ball
- rocker arm
- feed channel
- bumper
- receptacle
- 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.)
- Granted
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
- F01L1/18—Rocking arms or levers
-
- 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
- F01L1/146—Push-rods
-
- 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
- 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
-
- 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
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/01—Absolute values
Definitions
- the invention relates to a device for valve clearance compensation of intake and exhaust valves of an internal combustion engine for timing adjustments via a rocker arm, a bumper being held in a bearing of the rocker arm between the rocker arm and a rocker arm of a valve train.
- Eccentrics on a rocker arm axis are known for adjusting the timing of intake and exhaust valves.
- the valve clearance changes at the same time. Adjustment of the valve may be necessary if the change in valve clearance has not been taken into account by a corresponding run-up curve of the control cam on a camshaft.
- Such rocker arm geometries with often different bumper lengths for the intake and exhaust valves and small valve lash changes cannot be accommodated in the engine due to their design.
- the object of the invention is to provide an automatic valve lash adjuster via a device between a bumper and a rocker arm.
- a valve clearance change can be compensated for by a simple construction of the bumper in the rocker arm as a hydraulic bearing.
- the receptacle is connected to a supply channel for hydraulic oil, which is connected to the lubricating oil circuit of the engine.
- pressure can build up between a bearing element of the bumper and its reception in the rocker arm in accordance with the position of the cam contour relative to the roller on the rocker arm.
- the bearing element can consist of a ball or a cylindrical piston according to the features of claims 2 and 3.
- the feed channel in the receptacle is provided with a check valve as a ball or cone, or it is only designed as a channel with a relatively small diameter.
- the bumper in its receptacle on the rocker arm, it can be provided with a dome-shaped depression.
- a spherical zone connects to the side of this recess as a supporting area.
- the valve clearance compensation device is provided between a bumper 1 and a rocker arm 2 of a valve train of an internal combustion engine.
- the rocker arm 2 is held over a roller 4 on the cam 5 of a camshaft of the engine.
- the rocker arm 2 can be adjusted to the cam 5 via an eccentric adjustment device 6.
- the bumper 1 is supported in a hydraulic receptacle 7 on the rocker arm 2 with one end 8 and with the other end 9 turned away in the rocker arm 10. This acts with its lever end 11 on a valve 12. The simultaneous actuation of two valves is shown.
- the bumper 1 has at the end 8 a bearing element which can be designed as a ball 13 or as a piston 14, as shown in FIGS. 2 and 4.
- the ball 13 is held in a ball socket 15, which has a supply channel opening into the center 16; 16a for hydraulic oil. This channel is connected to a lubricating oil circuit of the engine and has a check valve 17; 17a.
- the valve 17 comprises a ball 18 and the valve 17a a cone element 19.
- the ball socket 15 is designed with a gap of the same width a, as shown in FIGS. 2 to 4.
- the ball socket can also be provided with a carrot-shaped depression 20 according to FIG. 5.
- a support area 21 and 22 for the ball 13 of the bumper 1 extends over an angular range c and d on both sides of the recess 20.
- the roller 4 When the device is functioning, the roller 4 is located on a base circle G of the cam 5. 16a and the check valve 17; 17a penetrate into the narrow gap 25 between ball socket 15 or cylindrical receptacle 15a and ball 13.
- the bumper 1 is moved against the rocker arm 10 and braced hydraulically.
- the ball 13 with the diameter d is very narrow in the cylindrical diameter D into the cylindrical bore adjoining the ball socket 15 26 fitted so that stable pressure conditions can be achieved.
- the valve 12 is actuated via the contour of the cam 5.
- the pressure rises in the gap space 25.
- the feed channel 16; 16a closed by the ball 18 or the cone 19 (very small stroke design). Due to the short time and the small annular gap cross section in the cylindrical area, very little lubricating oil can escape.
- the dimension z between the bottom of the ball span 15 and the highest elevation of the ball 13 is reduced slightly in this period.
- the roller 4 is again on the base circle G.
- the bumper 1 is relaxed.
- Lubricating oil can again via the feed channel 16; 16a are replenished. Approximately 2.5 times the valve actuation time is available for the lubricating oil refill.
- the bumper mounting can then be designed according to FIG. 3 with a relatively small diameter feed channel 16.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4400876A DE4400876A1 (de) | 1994-01-14 | 1994-01-14 | Vorrichtung zum Ventilspielausgleich |
DE4400876 | 1994-01-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0663515A1 true EP0663515A1 (fr) | 1995-07-19 |
EP0663515B1 EP0663515B1 (fr) | 1997-04-23 |
Family
ID=6507889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94119725A Expired - Lifetime EP0663515B1 (fr) | 1994-01-14 | 1994-12-14 | Dispositif de compensation du jeu des soupapes |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0663515B1 (fr) |
DE (2) | DE4400876A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10041466B4 (de) * | 2000-08-23 | 2008-10-09 | Man Diesel Se | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine |
DE10342642A1 (de) * | 2003-09-16 | 2005-05-04 | Ina Schaeffler Kg | Hydraulischer Nockenfolger |
DE102004004179A1 (de) * | 2004-01-28 | 2005-08-25 | Man B & W Diesel Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1090322A (fr) | 1953-12-30 | 1955-03-29 | Renault | Perfectionnements à la commande de soupapes de moteurs à combustion interne |
FR2325803A1 (fr) * | 1975-09-26 | 1977-04-22 | Chrysler France | Perfectionnements a un systeme de distribution d'un moteur a combustion interne |
FR2543614A3 (fr) * | 1983-04-01 | 1984-10-05 | Riv Officine Di Villar Perosa | Poussoir hydraulique a auto-reglage pour moteur a explosion, en particulier pour moteur dont les soupapes sont commandees par des culbuteurs |
EP0279275A1 (fr) * | 1987-02-12 | 1988-08-24 | Cummins Engine Company, Inc. | Articulation à rotule en céramique |
-
1994
- 1994-01-14 DE DE4400876A patent/DE4400876A1/de not_active Withdrawn
- 1994-12-14 EP EP94119725A patent/EP0663515B1/fr not_active Expired - Lifetime
- 1994-12-14 DE DE59402517T patent/DE59402517D1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1090322A (fr) | 1953-12-30 | 1955-03-29 | Renault | Perfectionnements à la commande de soupapes de moteurs à combustion interne |
FR2325803A1 (fr) * | 1975-09-26 | 1977-04-22 | Chrysler France | Perfectionnements a un systeme de distribution d'un moteur a combustion interne |
FR2543614A3 (fr) * | 1983-04-01 | 1984-10-05 | Riv Officine Di Villar Perosa | Poussoir hydraulique a auto-reglage pour moteur a explosion, en particulier pour moteur dont les soupapes sont commandees par des culbuteurs |
EP0279275A1 (fr) * | 1987-02-12 | 1988-08-24 | Cummins Engine Company, Inc. | Articulation à rotule en céramique |
Non-Patent Citations (2)
Title |
---|
"two stage turbocharged high speed engines", AUS DER ZEITSCHRIFT SCHIPBUILDING & MARINE ENGINEERING INTERNATIONAL BD.101, 01.09.1978 MAIDSTONE-GB, pages 411 - 415 |
"two-stage turbocharged high-speed engines", SHIPBUILDING & MARINE ENGINEERING INTERNATIONAL, vol. 101, 1 September 1978 (1978-09-01), MAIDSTONE-GB, pages 411 - 415 * |
Also Published As
Publication number | Publication date |
---|---|
DE59402517D1 (de) | 1997-05-28 |
DE4400876A1 (de) | 1995-07-20 |
EP0663515B1 (fr) | 1997-04-23 |
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