EP1527259A1 - Rollenstössel für eine brennkraftmaschine - Google Patents
Rollenstössel für eine brennkraftmaschineInfo
- Publication number
- EP1527259A1 EP1527259A1 EP03793614A EP03793614A EP1527259A1 EP 1527259 A1 EP1527259 A1 EP 1527259A1 EP 03793614 A EP03793614 A EP 03793614A EP 03793614 A EP03793614 A EP 03793614A EP 1527259 A1 EP1527259 A1 EP 1527259A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tappet
- piston
- roller
- housing
- compression spring
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
-
- 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
-
- 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
- F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
-
- 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
- F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
- F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
Definitions
- the invention relates to a roller tappet for a valve train or an injection device of an internal combustion engine, with a rotatably mounted roller, on which a cam contour of a camshaft acts, and with a hollow tappet piston, in which a helical compression spring is arranged and supported coaxially.
- roller tappet is used in hydraulic pump units actuated by camshafts, e.g. B. hydraulic valve trains or GDI injectors (Gasoline Direct Injection).
- camshafts e.g. B. hydraulic valve trains or GDI injectors (Gasoline Direct Injection).
- a known pump unit the plunger of which, however, is not provided with a roller, has a plunger piston which is surrounded by a pump spring and which is arranged to be longitudinally displaceable in a cylinder.
- a spring plate is formed on the plunger piston and a spring support surface on the cylinder.
- the spring plate also serves as a sliding surface along which the cam slides, which moves the tappet piston relative to the cylinder body.
- this version also requires a lot of space and causes an expensive production.
- the tappet piston with the spring plate attached cannot be sharpened roundly.
- a roller tap is preferable to a sliding tap. There are very limited spaces that prevent the use of a larger roll. As the roll size decreases, the pressures in the roller-cam contact area and the speed of the roll increase.
- the invention has for its object to provide a roller tappet, the moving mass is very low.
- the plunger piston is pot-shaped and has a bottom surface on which the helical compression spring rests directly at one end.
- the integration of the helical compression spring in the interior of the tappet piston enables a compact design of the tappet when using a roller as a tap.
- the size of the roller can be made large in accordance with the available cross section of the tappet piston.
- the plunger piston can be mounted so as to be linearly displaceable in a cylinder bore of a housing, acting as a pump piston, which is connected to a channel arranged in the housing for a liquid or gaseous medium to be delivered.
- a cylinder deriform support body may be arranged, which is partially surrounded by the plunger piston.
- a bore acting as a line for the medium to be conveyed can be arranged in the support body, through which the interior of the tappet piston containing the helical compression spring, which is otherwise closed and acts as a pressure space, is connected to the channel of the housing.
- an annular space adjoining the tappet piston which is formed by the housing and the support body within the cylinder bore, to be connected to the channel of the housing via bores acting as lines for the medium to be conveyed.
- the plunger piston can be sharpened round without a tip, which reduces manufacturing costs.
- the plunger can be flattened on one or two sides, or an anti-rotation pin can be attached.
- FIG. 1 shows a roller tappet according to the invention in a first embodiment
- Figure 2 shows a roller tappet according to the invention in a second embodiment
- Figure 3 shows a known plunger
- a known injection device shown in FIG. 4 has a camshaft 1, which rotates a deflection lever 3 about an axis 4 via a roller 2.
- a roller 6 of a roller tappet 7 bears against a cam contour 5 of the deflection lever 3.
- a main injection piston 8 is connected to the roller tappet 7 and is linearly displaceably mounted in an associated cylinder 9.
- the roller tappet 7 is also mounted with its cylindrical jacket in a cylinder 10 of a housing such that it can be moved linearly.
- a return helical compression spring 11 is mounted between a bottom of the cylinder 10 (not shown) and a cup-shaped insert 12 on the upper side of the main injection piston 8 and thus tends to push the main injection piston 8 into a rest position.
- the cylinder 10 is part of a housing into which an inlet channel is drilled, which opens into the pressure chamber immediately below the end face of the main injection piston 8 in the rest position thereof.
- a known plunger 13 shown in Figure 3 consists of a fixed cylinder 14, a plunger piston 15 arranged longitudinally displaceably in the cylinder and a pump spring 16, which is designed as a cylindrical helical compression spring and concentrically surrounds the plunger 13.
- a spring support surface 17 is formed on the outer surface of the cylinder 14.
- the pump spring 16 is supported on a spring plate 18, which is formed on the end of the plunger 13 located outside the cylinder 14.
- the end face of the spring plate 18 serves as a sliding surface for the cam of a camshaft, which, in cooperation with the pump spring 16, causes the tappet 13 to move back and forth.
- FIG. 1 shows a roller tappet 19 according to the invention, which has a cup-shaped tappet piston 20 with a cylindrical jacket and an end face.
- a cylinder arranged helical compression spring 22 In the interior 21 of the tappet piston 20 there is a cylinder arranged helical compression spring 22. This is supported with an axial end on the inner bottom surface 23 of the tappet piston 20 and with its other axial end on a cylindrical support body 24 which is inserted in a cylinder bore 25 of a fixed housing 26 and is axially supported.
- the tappet piston 20 is inserted linearly displaceably over part of its length in the cylinder bore 25 and here surrounds the support body 24 acted upon and in cooperation with the helical compression spring 22 can be set in a reciprocating movement.
- the periodic change in volume of the interior 21 that occurs produces the pumping action, that is to say pushing out a flow medium to be conveyed through a central line 28 of the support body 24 and the housing 26 into a channel 29 of the housing 26, and then sucking in the flow medium in the opposite direction.
- a roller tappet 30 according to the invention shown in FIG. 2 is basically constructed in the same way. Here, however, flow medium is conveyed by the periodic change in volume of an annular space 34 formed by the cylinder bore 31 of the housing 32 and the support body 33 below the tappet piston 35.
- the annular space 34 is connected to the channel 29 of the duct 32 via a plurality of lines 36 arranged in the housing 32 Housing 32 connected.
- the interior 21 with the inserted helical compression spring 22 supported on the bottom surface 23 is not a pump pressure chamber here, it is open to the outside through a bore 37 made in the bottom of the tappet piston 35 towards the roller 27.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10236838A DE10236838A1 (de) | 2002-08-10 | 2002-08-10 | Rollenstößel für eine Brennkraftmaschine |
| DE10236838 | 2002-08-10 | ||
| PCT/EP2003/007219 WO2004022930A1 (de) | 2002-08-10 | 2003-07-05 | Rollenstössel für eine brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1527259A1 true EP1527259A1 (de) | 2005-05-04 |
| EP1527259B1 EP1527259B1 (de) | 2008-11-05 |
Family
ID=30775158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03793614A Expired - Lifetime EP1527259B1 (de) | 2002-08-10 | 2003-07-05 | Rollenstössel für eine brennkraftmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1527259B1 (de) |
| AU (1) | AU2003263171A1 (de) |
| DE (2) | DE10236838A1 (de) |
| WO (1) | WO2004022930A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016105209A1 (de) | 2016-02-02 | 2017-08-03 | Darius Loba | Kraftstoffhochdruckpumpe mit einem gewichtsreduzierten Kolben |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB172686A (en) * | 1920-08-10 | 1921-12-12 | Ernest Arthur Franks | Improvements in means for operating the valves of engines |
| US1690032A (en) * | 1927-04-25 | 1928-10-30 | Noble | Hydraulic valve gear |
| US2277418A (en) * | 1940-08-29 | 1942-03-24 | Simson Godfrey | Hydraulic valve operating system |
| DE1123518B (de) * | 1959-03-19 | 1962-02-08 | Daimler Benz Ag | Einrichtung zur Verstellung des Einspritzzeitpunktes bei Brennkraftmaschinen |
| US4475515A (en) * | 1981-09-05 | 1984-10-09 | Lucas Industries Public Limited Company | Fuel systems for compression ignition engines |
| DE3731240C2 (de) * | 1987-09-17 | 1995-04-06 | Volkswagen Ag | Einspritzvorrichtung |
| GB9612178D0 (en) * | 1996-06-11 | 1996-08-14 | Ricardo Consulating Engineers | Hydraulic tappets |
| US6439204B1 (en) * | 1999-08-19 | 2002-08-27 | Stanadyne Corporation | Timing advance piston for unit pump or unit injector and method thereof |
| DE19956092A1 (de) * | 1999-11-22 | 2000-10-26 | Siemens Ag | Kolbenpumpe, insbesondere Hochdruck-Radialkolbenpumpe |
-
2002
- 2002-08-10 DE DE10236838A patent/DE10236838A1/de not_active Withdrawn
-
2003
- 2003-07-05 WO PCT/EP2003/007219 patent/WO2004022930A1/de not_active Ceased
- 2003-07-05 EP EP03793614A patent/EP1527259B1/de not_active Expired - Lifetime
- 2003-07-05 DE DE50310746T patent/DE50310746D1/de not_active Expired - Lifetime
- 2003-07-05 AU AU2003263171A patent/AU2003263171A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004022930A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004022930A1 (de) | 2004-03-18 |
| DE10236838A1 (de) | 2004-02-26 |
| DE50310746D1 (de) | 2008-12-18 |
| EP1527259B1 (de) | 2008-11-05 |
| AU2003263171A1 (en) | 2004-03-29 |
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