EP0646217A1 - Camshaft drive - Google Patents
Camshaft driveInfo
- Publication number
- EP0646217A1 EP0646217A1 EP94913559A EP94913559A EP0646217A1 EP 0646217 A1 EP0646217 A1 EP 0646217A1 EP 94913559 A EP94913559 A EP 94913559A EP 94913559 A EP94913559 A EP 94913559A EP 0646217 A1 EP0646217 A1 EP 0646217A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker arm
- cam
- injection pump
- pump
- speed
- 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
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
- F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
-
- 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
-
- 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
- F01L1/181—Centre pivot rocking arms
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Definitions
- the invention relates to a cam drive via a camshaft for the exhaust and intake valve and for actuating the injection pump in a diesel engine, only one cam being provided for actuating the three functions per cylinder.
- valve control In the case of small diesel engines in particular, shortening the camshaft is a goal that the designer has striven for. He will therefore try to reduce the number of cams for drives to be actuated via the camshaft.
- the different requirements for the movement sequences are problematic on the one hand for the two valves and on the other hand for the injection pump.
- the purpose of the valve control is to ensure that the inlet valve is open for a sufficiently long time when it reaches top dead center and that the outlet valve is open when bottom dead center is reached, so that good filling or emptying of the cylinder can be achieved. Accordingly, the designer strives for a rather elongated, ideally rectangular curve between top and bottom dead center. Due to a curve shape approximating to such a rectangular profile, the curves on the side of the valve train can tendency mass accelerations and Hertz forces are limited.
- the ideal course of the curve for the punch speed is here a curve which rises particularly steeply up to the top dead center, for the speed of the punch of the injection pump; the three phases of the pump control, namely the preliminary stroke during which the intake duct is closed, an intermediate stroke during which the relief volume in the injection pump is filled and finally the short one are lined up in time within this increasing branch of the speed curve Injection stroke ended before the top dead center of the pump plunger was reached.
- the falling branch of the speed profile can be described as uncritical.
- the aim of the present invention is to provide a simple multifunctional camshaft drive which requires a reduced design effort and enables a compact construction, so that it particularly meets the requirements for very small diesel units.
- rocker arm for the actuation of the injection pump is of particular importance. While the rocker arms for actuating the exhaust and intake valves can be designed in the usual way as rocker arms, the design of the rocker arm for the injection pump is about the design and arrangement of the steep profile of speed for the punch speed explained above to realize.
- the spatial arrangement of the rocker arm pivot axis is decisive for the course of the piston speed of the injection pump, such that the piston speed diger, based on the cam angle, takes a steeper course, the smaller the distance of the rocker arm pivot axis from the connecting line between the two rolling points of the rocker arm is chosen; this distance can even assume a negative value, ie the rocker arm pivot axis travels over the connecting line on the side on which the camshaft is also located.
- the distance between the center of the rocker arm pivot axis and the connecting line between the rolling point with the cams and the rolling point with the plunger prefferably be less than 40% of the length of this connecting line, preferably between 5% and 15 %, to choose.
- the rocker arm assumes an approximately linearly elongated shape, ie the pivot axis of the rocker arm has less than 10% lateral displacement, based on the length of the connecting line between the cam-side and the stamp-side rolling point of the rocker arm. In this way, a high relative speed between the rotating cam and the assigned rolling point is ensured.
- the return spring for the rocker arm which actuates the injection pump, can either be by the plunger spring in the injection pump or by a separate compression spring, which is applied to an extension of the cam-side end of the rocker arm, or also by a appropriately positioned tension spring be formed so that constant contact with the cam is ensured.
- the two valves are supported in the usual way by valve springs.
- Fig. 2 shows an extended rocker arm for driving the injection pump
- Fig. 3 shows an outwardly angled rocker arm for driving the injection pump
- Fig. 4 shows an inwardly angled rocker arm for driving the injection pump
- Fig. 1 shows a cross section through a camshaft 1 with a single cam 2 on the one hand for the actuation of the rocker arm 3, with which the valve tappet 4 for the Let and the exhaust valve are controlled, on the other hand for the actuation of a rocker arm 5, with which the injection pump 6 is controlled.
- This sits with its pump cylinder 7 directly in a corresponding bore in the cylinder head 8, in which the corresponding channels for the fuel flow are also incorporated, namely a channel 9 for the fuel supply and a channel 10 for the fuel return line.
- a connection thread 12 is provided at the upper end of the pump head 11 for connecting the pressure line.
- the pump ram 13 is connected with its rocker arm end 14 via a driver 15 to a scanning roller 17 mounted on the shaft 16.
- the rocker arm 5 for actuating the injection pump 13 can be pivoted about a rocker arm pivot axis 20.
- the contact between the scanning roller 18 and the cam 2 of the camshaft 1 is ensured by a compression spring 22 attached to an extended end 21 of the rocker arm 5, which is clamped between the end 21 of the rocker arm 5 and a seat 23 fixed to the housing.
- three functions are operated in succession by the same cam 2, namely the rocker arm 5 for the beta
- a control curve (not shown in detail) at the inner end of the pump plunger 13 controls the usual functions associated with fuel injection when it is actuated.
- rocker arm pivot axis 20 is, based on the drawing, below the connecting line of the two rolling points 25, 26 on the rocker arm 5; 4, on the other hand, is more angled inwards, ie the rocker arm pivot axis 20 is, based on the drawing, above the connecting line mentioned. If these relationships based on the optical appearance are related to the geometric center of the above three embodiments of the rocker arm, the center points lie approximately on the connecting line (FIG.
- the curve with the solid line shows the profile of the punch speed with an approximately extended rocker arm according to Fig. 2; the curve with the chain-dotted line shows the profile of the stamp speed with an outwardly angled rocker arm according to FIG. 3.
- the curve with the dashed line shows the profile of the stamp speed with a slightly inwardly angled rocker arm according to FIG. 4.
- the curves illustrate the influence of the rocker arm shape or the selected position of the rocker arm swivel axis on the speed curve. 2 to 4, the rocker arm 5 is shown with a solid line in the contact position on the cam 2; the toggle lever position shown with a dash-dotted line shows its maximum deflection by the cam 2, the pump plunger 13 always being in the maximum retracted position.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4311877A DE4311877C2 (en) | 1993-04-10 | 1993-04-10 | Camshaft drive |
DE4311877 | 1993-04-10 | ||
PCT/EP1994/001097 WO1994024419A1 (en) | 1993-04-10 | 1994-04-08 | Camshaft drive |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0646217A1 true EP0646217A1 (en) | 1995-04-05 |
EP0646217B1 EP0646217B1 (en) | 1997-12-29 |
Family
ID=6485261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94913559A Expired - Lifetime EP0646217B1 (en) | 1993-04-10 | 1994-04-08 | Camshaft drive |
Country Status (8)
Country | Link |
---|---|
US (1) | US5540207A (en) |
EP (1) | EP0646217B1 (en) |
JP (1) | JP3388745B2 (en) |
CN (1) | CN1047820C (en) |
AU (1) | AU6566594A (en) |
DE (2) | DE4311877C2 (en) |
ES (1) | ES2111299T3 (en) |
WO (1) | WO1994024419A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5957673A (en) * | 1993-03-11 | 1999-09-28 | Motorenfabrik Hatz Gmbh & Co. Kg. | Injection pump for diesel engines |
DE19836540B4 (en) * | 1998-08-06 | 2006-02-09 | Herbert Naumann | Valve stroke |
US6405707B1 (en) | 2000-12-18 | 2002-06-18 | Caterpillar Inc. | Integral engine and engine compression braking HEUI injector |
SE521189C2 (en) * | 2002-02-04 | 2003-10-07 | Volvo Lastvagnar Ab | Device for supplying EGR gas |
US6988473B2 (en) * | 2003-06-26 | 2006-01-24 | Delphi Technologies, Inc. | Variable valve actuation mechanism having an integrated rocker arm, input cam follower and output cam body |
JP4221327B2 (en) * | 2004-04-13 | 2009-02-12 | 三菱ふそうトラック・バス株式会社 | Variable valve operating device for internal combustion engine |
CN100387393C (en) * | 2005-06-08 | 2008-05-14 | 大连机床集团有限责任公司 | Four curve low impact high speed lifting mechanism |
CN100425805C (en) * | 2006-06-02 | 2008-10-15 | 李明 | Engine valve driving device |
EP2129880A1 (en) * | 2007-02-06 | 2009-12-09 | Cloyce M. Harlan | Hydraulic spring drive apparatus |
US20080230036A1 (en) * | 2007-03-23 | 2008-09-25 | Bauman William D | Roller actuator for a mechanical fuel pump |
US7610902B2 (en) * | 2007-09-07 | 2009-11-03 | Gm Global Technology Operations, Inc. | Low noise fuel injection pump |
US20100316506A1 (en) * | 2009-06-11 | 2010-12-16 | Gm Global Technology Operations, Inc. | Engine fuel pump drive system |
CN103786001B (en) * | 2014-03-03 | 2016-03-02 | 重庆全润动力机械有限公司 | A kind of manufacture method of jerk pump lever |
WO2016094396A1 (en) * | 2014-12-08 | 2016-06-16 | Harlan Cloyce M | Hydraulic spring drive apparatus |
US10641140B2 (en) * | 2017-05-12 | 2020-05-05 | Caterpillar Inc. | Hydraulic early engine exhaust valve opening system |
US20240003340A1 (en) * | 2022-06-30 | 2024-01-04 | Cloyce Milton Harlan | Spring drive apparatus |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB662172A (en) * | 1948-04-07 | 1951-12-05 | List Hans | Improvements in and relating to fuel injection internal combustion engines |
FR1563362A (en) * | 1967-04-22 | 1969-04-11 | ||
US3413965A (en) * | 1967-07-13 | 1968-12-03 | Ford Motor Co | Mechanism for varying the operation of a reciprocating member |
NL154807B (en) * | 1968-10-04 | 1977-10-17 | Werkspoor Amsterdam Nv | CAMP DISC OR SIMILAR DRIVE MECHANISM FOR COMBUSTION ENGINE FUEL INJECTION PUMP. |
FR2094565A5 (en) * | 1970-06-25 | 1972-02-04 | Loby Gilbert | |
US3814067A (en) * | 1971-02-08 | 1974-06-04 | Guadalajara De La Fuente | Internal combustion engine combustion chamber design and air/fuel mixture supply means |
AT379865B (en) * | 1980-02-08 | 1986-03-10 | Simmering Graz Pauker Ag | WATER-COOLED INTERNAL COMBUSTION ENGINE |
GB2090911B (en) * | 1980-11-28 | 1984-06-27 | Yanmar Diesel Engine Co | Overhead cam type diesel engine |
DE3325510A1 (en) * | 1983-07-15 | 1985-01-24 | Ernst 6940 Weinheim Weidmann | Timing mechanism for four-stroke internal combustion engines with a cam for actuating the intake and exhaust valve and the injection pump |
AT391165B (en) * | 1984-05-22 | 1990-08-27 | Steyr Daimler Puch Ag | CAM DRIVE FOR AN AIR COMPRESSING, SELF-IGNITIONING PISTON PISTON COMBUSTION ENGINE |
JPS62159762A (en) * | 1986-01-08 | 1987-07-15 | Honda Motor Co Ltd | Diesel engine |
FR2643676B1 (en) * | 1989-02-28 | 1991-06-07 | Peugeot | ROCKER FOR ACTUATING A ROD VALVE OF AN INTERNAL COMBUSTION ENGINE |
DE4212255C2 (en) * | 1992-04-11 | 1996-12-19 | Daimler Benz Ag | Arrangement of a fuel injection device on the housing of an internal combustion engine |
-
1993
- 1993-04-10 DE DE4311877A patent/DE4311877C2/en not_active Expired - Fee Related
-
1994
- 1994-04-08 US US08/351,332 patent/US5540207A/en not_active Expired - Fee Related
- 1994-04-08 WO PCT/EP1994/001097 patent/WO1994024419A1/en active IP Right Grant
- 1994-04-08 CN CN94190187A patent/CN1047820C/en not_active Expired - Fee Related
- 1994-04-08 DE DE59404878T patent/DE59404878D1/en not_active Expired - Fee Related
- 1994-04-08 JP JP52271394A patent/JP3388745B2/en not_active Expired - Fee Related
- 1994-04-08 EP EP94913559A patent/EP0646217B1/en not_active Expired - Lifetime
- 1994-04-08 ES ES94913559T patent/ES2111299T3/en not_active Expired - Lifetime
- 1994-04-08 AU AU65665/94A patent/AU6566594A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9424419A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4311877C2 (en) | 1996-05-15 |
AU6566594A (en) | 1994-11-08 |
EP0646217B1 (en) | 1997-12-29 |
CN1104833A (en) | 1995-07-05 |
US5540207A (en) | 1996-07-30 |
ES2111299T3 (en) | 1998-03-01 |
JP3388745B2 (en) | 2003-03-24 |
CN1047820C (en) | 1999-12-29 |
JPH07508817A (en) | 1995-09-28 |
DE59404878D1 (en) | 1998-02-05 |
WO1994024419A1 (en) | 1994-10-27 |
DE4311877A1 (en) | 1994-10-13 |
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