EP2261472A1 - A driving assembly for a motor vehicle engine brake - Google Patents
A driving assembly for a motor vehicle engine brake Download PDFInfo
- Publication number
- EP2261472A1 EP2261472A1 EP10006002A EP10006002A EP2261472A1 EP 2261472 A1 EP2261472 A1 EP 2261472A1 EP 10006002 A EP10006002 A EP 10006002A EP 10006002 A EP10006002 A EP 10006002A EP 2261472 A1 EP2261472 A1 EP 2261472A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- driveshaft
- rocking lever
- exhaust
- rocking
- disc element
- 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.)
- Withdrawn
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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
- F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
Definitions
- the present invention relates to a driving assembly for driving the engine brake of a motor vehicle, in particular an industrial vehicle, a truck, a bus or an agricultural vehicle.
- Document EP 1927735 discloses driving assemblies including a single pneumatic actuator and eccentric bush elements each including a radial lug provided with connection holes for connecting a coupling bar adapted to rigidly synchronize the eccentric bush elements and damping the output rocking levers operating with synchronized phases but with offset movements.
Abstract
A driving assembly for a motor vehicle engine or exhaust brake comprises a driveshaft (1) supporting a plurality of rocking levers (7) which control, through rocking lever stems (6), exhaust valves (11), each rocking lever (7) comprising a recess (15) housing a disc element, each disc element (16) being eccentrically integral with the rocking lever supporting driveshaft (1) and each disc element operatively engaging the stem (8) of the exhaust valve (10) in an overlapping relationship with respect to the eccentric assembly (14) driven by the rotary driveshaft (1).
Description
- The present invention relates to a driving assembly for driving the engine brake of a motor vehicle, in particular an industrial vehicle, a truck, a bus or an agricultural vehicle.
- As is known, engine or exhaust brakes are used for slowing down a vehicle speed without directly operating the vehicle mechanical brakes which directly affect the motor vehicle wheels.
- Document
EP 11482131 - Document
EP 1927735 discloses driving assemblies including a single pneumatic actuator and eccentric bush elements each including a radial lug provided with connection holes for connecting a coupling bar adapted to rigidly synchronize the eccentric bush elements and damping the output rocking levers operating with synchronized phases but with offset movements. - Thus, up to now, it was not possible to properly set the above drive assembly, even if could be made at a smaller cost. Finally, document
EP 1151587 discloses driving means integral with the rocking lever assembly associated with each exhaust valve and using holes or borings in the output or exhaust rocking lever assembly to cause lubricating oil to be conveyed to and trapped in the lubricating system by unidirectional values, thereby extending a small plunger directly controlling the exhaust valve to upward drive the latter to in turn throttling the latter to provide exhaust braking. However, since in the above prior construction it is necessary to provide valved plugs and related sealing gaskets and channels, the rocking lever size and driving inertia are disadvantageously increased. - Thus, the aim of the present invention is to overcome the above mentioned drawbacks of the prior art by providing a driving device or assembly for driving a motor vehicle engine or exhaust brake which has a simpler and lighter construction and an improved and efficient operation.
- According to one aspect of the present invention, the above aim is achieved by a driving assembly for a motor vehicle engine or exhaust brake, comprising a driveshaft supporting a plurality of rocking levers which control, through rocking lever stems, exhaust valves, characterized in that each rocking lever comprises a recess housing a disc element, each disc element being eccentrically integral with said rocking lever supporting driveshaft and that each said disc element operatively engages the stem of the exhaust valve in an overlapping relationship with respect to an eccentric assembly driven by the rotary driveshaft.
- The invention will be hereinafter disclosed and illustrated in a more detailed manner by an exemplary embodiment thereof, with reference to the accompanying drawings, where:
-
Figure 1 shows a shaft including rocking lever assemblies for controlling a suction stroke and further rocking lever assemblies for controlling an exhaust stroke; -
Figure 2 schematically shows a closed exhaust valve and related driving or control rocking lever assembly; -
Figure 3 schematically shows a partially opened exhaust valve and related driving or control lever assembly; -
Figure 4 schematically shows a fully opened exhaust valve and related driving or control lever assembly; and -
Figure 5 is a perspective view showing the shaft supporting elements with a related driving means. - As shown in
Figure 1 , a rocking lever bearing driveshaft 1 is coupled to an engine head, schematically indicated by 2, by supportingelements 3 connected to said head by connectingscrews 4, thereby said driveshaft 1 may freely rotate about its longitudinal axis. - The driveshaft 1 supports a plurality of rocking levers 5 which control, through rocking lever stems 6, suction valves and a further plurality of rocking levers 7 controlling, through rocking
lever stems 8, exhaust valves. -
Figures 2 ,3 and4 show anexhaust duct 9 including a valve seat or recess 10 engageable by aplate 11 of avalve stem 8 controlled bycorresponding rocking lever 7 which may be driven, in a per se known manner, by an eccentric assembly generally indicated by 14. - Approximately at a central portion of each rocking lever 7 a seat or recess 15 rotatably engaging therein a
disc element 16 is provided. - Said
disc element 16 being eccentrically integral with the rockinglever 7 supporting drive shaft 1. - The engine or exhaust brake device is controlled by an
actuator 17 or a central driving mechanism shown inFigure 5 . Saidactuator 17 may be a pneumatic, hydraulic, mechanic or electronic actuator and is driven or controlled by a remote control device coupled to the vehicle braking system, saidactuator 17 or central mechanism being driven with a fixed and preset driving stroke to cause the rocking lever supporting driveshaft 1 to turn through a preset angle. - Since said driveshaft 1 is eccentrically arranged to change the
exhaust rocking lever 7 driving axis, this turning will involve a variation of the contact points of theexhaust valves related rocking levers 7, thereby providing the desired engine brake or exhaust mode of operation. - As the rocking
levers 7 are downward driven in an actuated exhaust brake condition, saidexhaust valves 11 are prevented from being fully closed during the engine compression, expansion and explosion strokes and may be freely opened during the exhaust stroke thereby providing a throttled or narrowing path allowing cylinder air to leak therethrough during the piston compression stroke. - Thus, just in the pressure or compression strokes, an engine exhaust braking is achieved, and a substantial part of the vehicle inertia is used to eject air from the cylinder. Since no pressurized air is available to return power to the engine during the expansion strokes, additional working power must be expended for sucking air through the narrowed portion of each exhaust valve, thereby providing an extended exhaust braking operation, without affecting the suction rocking levers which are controllably driven by the cam assembly.
Claims (3)
- A driving assembly for a motor vehicle engine or exhaust brake, comprising a driveshaft (1) supporting a plurality of rocking levers (7) which control, through rocking levers stems (6), exhaust valves (11), characterized in that each rocking lever (7) comprises a recess (15) housing a disc element, each disc element (16) being eccentrically integral with said rocking lever supporting driveshaft (1) and that each said disc element operatively engages the stem (8) of the exhaust valve (10, 11) in an overlapping relationship with respect to an eccentric assembly (14) driven by the rotary driveshaft (1).
- A driving assembly, according to claim 1, characterized in that said rocking lever supporting driveshaft (1) is operatively coupled to an actuator (17) or to a central driving mechanism.
- A driving assembly, according to claim 1, characterized in that said rocking lever supporting driveshaft (1) is rotatively supported about its longitudinal axes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2009A001032A IT1397350B1 (en) | 2009-06-11 | 2009-06-11 | DRIVE UNIT FOR A MOTOR BRAKE OF A MOTOR VEHICLE. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2261472A1 true EP2261472A1 (en) | 2010-12-15 |
Family
ID=41527800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10006002A Withdrawn EP2261472A1 (en) | 2009-06-11 | 2010-06-10 | A driving assembly for a motor vehicle engine brake |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110132300A1 (en) |
EP (1) | EP2261472A1 (en) |
CN (1) | CN101922326A (en) |
BR (1) | BRPI1004105A2 (en) |
IT (1) | IT1397350B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2662542A4 (en) * | 2011-01-05 | 2016-06-22 | Shanghai Universoon Autoparts | Auxiliary valve actuating mechanism of engine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8919311B2 (en) | 2013-03-06 | 2014-12-30 | General Electric Company | Method and systems for variable valve timing for a V-engine with a single central camshaft |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1812787A (en) * | 1929-06-05 | 1931-06-30 | Ora M Doolittle | Braking attachment for vehicle motors |
US2002196A (en) * | 1931-03-09 | 1935-05-21 | Int Motor Co | Engine brake |
US3367312A (en) * | 1966-01-28 | 1968-02-06 | White Motor Corp | Engine braking system |
EP1148213A1 (en) | 2000-04-18 | 2001-10-24 | IVECO FIAT S.p.A. | An assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, and an internal combustion engine provided with this assembly |
EP1151587A1 (en) | 1999-01-29 | 2001-11-07 | International Thinklink Corporation | Apparatus and method for device independent messaging notification |
EP1927735A1 (en) | 2006-11-28 | 2008-06-04 | Iveco S.p.A. | Decompression braking device in endothermic engines |
EP1927734A2 (en) * | 2006-11-28 | 2008-06-04 | Iveco S.p.A. | Internal combustion engine provided with a valve opening variation system and vehicle equipped with such engine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1250612A (en) * | 1968-03-01 | 1971-10-20 | ||
GB1279977A (en) * | 1968-12-14 | 1972-06-28 | Vauxhall Motors Ltd | Internal combustion engine valve actuator mechanism |
US5148783A (en) * | 1990-03-08 | 1992-09-22 | Suzuki Kabushiki Kaisha | Valve actuating mechanism in four-stroke cycle engine |
US5025761A (en) * | 1990-06-13 | 1991-06-25 | Chen Kuang Tong | Variable valve-timing device |
IT1255447B (en) * | 1991-11-08 | 1995-10-31 | Iveco Fiat | ENGINE EQUIPPED WITH A CONTINUOUS BRAKING DEVICE, PARTICULARLY FOR AN INDUSTRIAL VEHICLE. |
DE19830168C2 (en) * | 1998-07-06 | 2000-05-25 | Meta Motoren Energietech | Device for activating and deactivating a gas exchange valve of an internal combustion engine |
JP3484406B2 (en) * | 2000-09-21 | 2004-01-06 | 川崎重工業株式会社 | Rocker arm support structure |
AU2003229224A1 (en) * | 2002-08-20 | 2004-03-11 | Alberto Keel | Rocker arm for valve actuation in internal combustion engines |
-
2009
- 2009-06-11 IT ITMI2009A001032A patent/IT1397350B1/en active
-
2010
- 2010-06-10 EP EP10006002A patent/EP2261472A1/en not_active Withdrawn
- 2010-06-10 US US12/797,795 patent/US20110132300A1/en not_active Abandoned
- 2010-06-11 CN CN201010250947XA patent/CN101922326A/en active Pending
- 2010-06-11 BR BRPI1004105-2A patent/BRPI1004105A2/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1812787A (en) * | 1929-06-05 | 1931-06-30 | Ora M Doolittle | Braking attachment for vehicle motors |
US2002196A (en) * | 1931-03-09 | 1935-05-21 | Int Motor Co | Engine brake |
US3367312A (en) * | 1966-01-28 | 1968-02-06 | White Motor Corp | Engine braking system |
EP1151587A1 (en) | 1999-01-29 | 2001-11-07 | International Thinklink Corporation | Apparatus and method for device independent messaging notification |
EP1148213A1 (en) | 2000-04-18 | 2001-10-24 | IVECO FIAT S.p.A. | An assembly for providing an engine brake system for an internal combustion engine, in particular of an industrial vehicle, and an internal combustion engine provided with this assembly |
EP1927735A1 (en) | 2006-11-28 | 2008-06-04 | Iveco S.p.A. | Decompression braking device in endothermic engines |
EP1927734A2 (en) * | 2006-11-28 | 2008-06-04 | Iveco S.p.A. | Internal combustion engine provided with a valve opening variation system and vehicle equipped with such engine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2662542A4 (en) * | 2011-01-05 | 2016-06-22 | Shanghai Universoon Autoparts | Auxiliary valve actuating mechanism of engine |
US9416692B2 (en) | 2011-01-05 | 2016-08-16 | Shanghai Universoon Autoparts Co., Ltd. | Auxiliary valve actuating mechanism of engine |
US9732643B2 (en) | 2011-01-05 | 2017-08-15 | Shanghai Universoon Autoparts Co., Ltd. | Engine valve actuation mechanism for producing a variable engine valve event |
Also Published As
Publication number | Publication date |
---|---|
IT1397350B1 (en) | 2013-01-10 |
US20110132300A1 (en) | 2011-06-09 |
BRPI1004105A2 (en) | 2012-07-03 |
CN101922326A (en) | 2010-12-22 |
ITMI20091032A1 (en) | 2010-12-12 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
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AX | Request for extension of the european patent |
Extension state: BA ME RS |
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17P | Request for examination filed |
Effective date: 20110613 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20110616 |