EP3498989A1 - Valve train for an internal combustion engine - Google Patents
Valve train for an internal combustion engine Download PDFInfo
- Publication number
- EP3498989A1 EP3498989A1 EP17207245.6A EP17207245A EP3498989A1 EP 3498989 A1 EP3498989 A1 EP 3498989A1 EP 17207245 A EP17207245 A EP 17207245A EP 3498989 A1 EP3498989 A1 EP 3498989A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fluid
- cavity
- rocker arm
- internal combustion
- 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- Withdrawn
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Classifications
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- 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
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- 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
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- 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
- F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
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- 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
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
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- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/107—Lubrication of valve gear or auxiliaries of rocker shaft bearings
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- 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
- F01L2001/2444—Details relating to the hydraulic feeding circuit, e.g. lifter oil manifold assembly [LOMA]
Definitions
- This invention relates to a valve train for an internal combustion engine with the features of the preamble of claim 1, an internal combustion engine comprising such a valve train and a method for operating a valve train.
- valve elements to control the intake of fuel and gas to the combustion engine. After the combustion process, wherein the fuel air mixture is burned, further valves are used to control the outlet of exhaust gases produced within the combustion.
- valves have a clearance between valve and valve seat because during engine operation the valves heat up. On account of the thermal expansion the valve stretches and the clearance between valve and valve seat ensures a save function of the valve train.
- the valve seats are strongly loaded by high temperatures and passing by particles. This passing by particles cause abrasive wear on the one side and do deposits on the other hand.
- the clearance between valve and valve seat is increased or decreased during engine life time. This clearance is also called valve lash. If the clearance between valve and valve seat is too large or to little the fuel consumption increases, the performance decreases, the emissions increase, the compression decreases and/or the temperature of the valve increases until they damage just to name a few examples.
- valve lash adjustment requires a great effort in time because each valve has to be adjusted by hand with the help of a feeler gauge.
- the valve lash adjustment can take several hours.
- valve train for an internal combustion engine having the features of claim 1, by an internal combustion engine comprising such a valve train according to claim 13 and an method for operating a valve train according to claim 14.
- Advantageous embodiments of the invention are defined in the dependent claims.
- the at least one valve actuating element can preferably be a configured to move translationally. Alternatively it can be configured to move in a rotating manner.
- the at least one cavity is in fluid communication with a fluid supplier through a conduct.
- the conduct is a bore arranged in the rocker arm. It can also be provided that an orifice and a drain are provided instead of the bore.
- the fluid is a lubricant, preferably oil.
- the at least one rocker arm is actuating more than one valve.
- the at least one cavity is arranged at least partially, preferably fully, in the at least one rocker arm. It can also be provided that the piston is used as the at least one valve actuating element.
- At least one cam shaft is provided, wherein the cam shaft has at least one cam and is rotatable.
- at least one cam follower is provided, which cam follower is arranged at the at least one cam, which converts a rotational movement of the cam shaft into a translational movement, which translational movement can be transferred by the cam follower, which works as actuating element or by use of actuating element to transfer, to the rocker arm.
- a lubrication of the at least one bearing is provided, wherein a fluid for the lubrication of the at least one bearing is provided, which corresponds to the fluid used in the at least one cavity and wherein the lubrication of the bearing serves as the fluid supply.
- the volume of the fluid in the at least one cavity can be varied in a non-actuated position of the at least one valve.
- the conduct of the at least one cavity can be closed in such a way, that a volume of the fluid in the at least one cavity can be held essentially constant in an actuated and/or during an actuating movement of the at least one valve.
- At least one valve bridge is provided for actuating at least two valves, wherein the at least one cavity is preferably arranged between the at least one valve bridge and the at least one valve. It can also be provided that the at least one cavity is arranged at least partially, preferably fully, in the at least one valve bridge.
- a conduct is arranged in the at least one valve bridge to connect the at least one cavity with the fluid supplier. It can also be provided that the conduct can be closed at least partially according to a position of the at least one valve bridge, preferably can be closed in an actuated position of the valve bridge. In this case the activated position is an open position of the at least one valve and the non-activated position is a closed position of the at least one valve.
- the at least one bearing has a shaft, wherein the bearing allows a rotational movement of the at least one rocker arm around the shaft. This means that the shaft stays in his position (does not rotate) and the at least one rocker arm (mounted on the shaft) could rotate around the shaft axis.
- a lubrication is provided between the shaft and the at least one rocker arm, wherein the conduct connects the at least one cavity with the bearing.
- At the at least one conduct connecting the at least one cavity with a reservoir, has at least one check valve, wherein the check valve only allows a unidirectional fluid motion.
- the at least one recess is provided on a surface of the shaft, which is configured to
- first and second position are different positions, which can be done by the rocker arm by a rational movement around the shaft.
- the at least one shaft recess on a surface of the shaft extends over a radial section.
- the extending radial section of the shaft recess tapers axially and the shaft is movable axially with respect to the rocker arm.
- a blocking element is provided centrally in the shaft.
- the shaft has in this embodiment a bore, connecting the blocking element with the at least one conduct leading to the at least one cavity.
- the blocking element can be moved from a first position to a second position, wherein the blocking element connects the at least one cavity in a first position with a reservoir/fluid supply and wherein the blocking element blocks (interrupts) the fluid communication between the at least one cavity and the reservoir/fluid supply.
- the blocking element is a rotationally symmetric element arranged in the shaft, which can be rotated between a first and a second position.
- At least one supply-pin is provided, supplying the at least one cavity with fluid. It can be provided that there is a supply pipe inside the supply-pin, supplying the at least one cavity with fluid.
- the at least one rocker arm or the at least one valve bridge has at least one supply-pin plunging recess, in which the at least one supply-pin can plunge at least partially. It can also be provided that that the at least one supply-pin serves as fluid supplier. It can be provided that
- the supply-pin is a rotationally symmetrical element and comprises a connecting section between the supply-pin and the at least one rocker arm or the at least one valve bridge and an opening thereon extending in a moving direction of the at least one rocker arm or the at least one valve bridge.
- a duration can be varied, wherein the at least one cavity is connected with the supply/reservoir.
- the opening tapers in a direction normal to a moving direction of the at least one rocker arm or the at least one valve bridge and the at least one supply pin is movable in the direction normal to the moving direction of the at least one rocker arm or the at least one valve bridge.
- an internal combustion engine preferably a stationary gas engine comprising a valve train according to the invention
- Protection is also sought for a method for operating a valve train, wherein at least one valve is actuated by at least one valve actuating element and the at least one valve actuating element is moved by at least one rocker arm, wherein the position of the at least one valve actuating element relative to the at least one valve is adjusted by varying a volume of fluid in a fluid element and thereby automatically adjusting valve lash or automatically avoiding valve lash.
- Fig. 1 shows a fist embodiment of the invention.
- the shown valve train 1 for an internal combustion engine comprises a rocker arm 2 mounted at a bearing 3.
- the rocker arm 2 can be moved around the bearing 3 by an actuating element 4.
- the rocker arm 3 comprises further a valve actuating element 5, which is configured to actuate a valve 6.
- the valve actuating element 5 can be moved by the rocker arm 2 and the at least one valve 6 of the internal combustion engine can be moved by the valve actuating element 5.
- the bearing 3 is mounted rotationally movable on a shaft 7.
- this cavity 8 for fluid.
- this cavity 8 is released as a bore in the rocker arm 2.
- this cavity 8 delimits a volume, which is filled by a fluid.
- the volume of the cavity 8 can be varied by moving the valve actuating element 5 relative to the rocker arm 2.
- the cavity 8 is connected by a conduct 9 with the bearing 3 of the rocker arm 2.
- the bearing 3 of the rocker arm 2 is used in this embodiment as fluid supplier.
- fluid which is used for the lubrication of the bearing 3, can be used in the cavity 8.
- the fluid supplier supplies fluid to the cavity 8. If fluid is passed back through the conduct 9 the fuel supplier is used as fluid reservoir.
- the conduct 9 is released as a bore in the rocker arm 3. The end of the bore, which forms the cavity 9, is closed by a grub screw 10.
- the fluid communication of the cavity 8 with the bearing 3 through the conduct 9 can be cut off by a movement of the rocker arm 2 around the shaft 7, because the conduct 9 connected to the bearing 3 through the bore 11 in the shaft 7 of the bearing 3. If the rocker arm 2 moves rotationally relative to the shaft 7 and the bearing 3. Through such a rotation (in order to activate the valve 6) the conduct 9 is moved away from the supply bore 11. In this situation (where no fluid communication between cavity 8 and fluid supplier is given) the volume of the fluid in the cavity 8 cannot be varied and the valve actuating element 5 cannot be moved relative to the rocker arm 3.
- valve actuating element 5 adjusts a valve drift (caused by the wear of the valve seat) in a position, wherein the cavity 8 is in fluid communication with the fluid supplier.
- This position corresponds in this embodiment to a non-actuated position of the valve 6.
- a moving of the valve actuating element 5 relative to the rocker arm 3 is prevented by the blocking of the conduct 9, thereby allowing the actuation of the valve 6.
- the cavity 8 is connected to the external environment by an orifice 12.
- the orifice 12 can be replaced by a sealing element to be installed after system de-airing/bleeding. This avoids special requirements on oil cleanliness if oils are used as fluid.
- a lubrication fluid from the bearing 3 is used for the cavity 8.
- the lubrication fluid is oil.
- Fig 2a shows cross section of the particular embodiment of Fig. 1 .
- This cross section shown by Fig. 2a gives an example how the lubrication fluid for the bearing 3 (which is also used in the cavity 8) can be supplied.
- the actuating element 4 contacts the push rod 14.
- This push rod 14 transmits an alternating transversal movement (created by a camshaft for example) to the actuating element 4.
- the push rod 14 shown can be used as fluid supplier, wherein the push rod 14 has a central bore conveying lubrication fluid to the actuating element 4.
- the actuating element 4 does also have a central bore leading the lubrication fluid from the push rod 14 to a bore 13 in the rocker arm 2. This bore 13, placed in the rocker arm 2 finally supplies the lubrication fluid to the bearing 3.
- the shaft 7 is fixed, i.e. not rotatable (per definition a pivot pin).
- the rocker arm 2 is pivoting around this pin.
- Fig. 2b shows in more detail the bore 11 in the bearing 3 which can be used to cut off the fluid communication with the cavity 8.
- a recess 15 is provided on the surface of the shaft 7, which is configured to connect in a first position (shown by Fig 2b and 3a ) of the rocker arm 2 relative to the shaft 7 the cavity 8 with lubrication of the bearing 3 by use of the conduct 9.
- the bearing 3 is provided with a ring (shown in darker gray), which is fixed on the shaft 7 and has a bore 11.
- the bearing 3 is released as a hydrostatic bearing, wherein no separate element would be used for the bearing 3, only the pressure of the lubrication would cause a separate layer of lubrication forming the bearing 3 (distance between rocker arm 2 and shaft 7).
- the bearing 3 is done by a hydrostatic bearing (also a hydrodynamic bearing would be possible) the conduct 9 would have a tubular element between the inner wall of the rocker arm and the outer surface of the shaft. This would only allow a fluid connection between bearing 3 and cavity 8 if the conduct 9 (with his tubular element) would be positioned in alignment over the recess 15. In all other positions (when the conduct 9 is not positioned over the recess 15) there would be no fluid communication between bearing 3 and cavity 8.
- Fig 3a shows the described embodiment of Fig. 1 and Fig. 2 in a first (non-actuated) position.
- Fig 3b sows the embodiment of Fig. 1 and 2 in a second (actuated) position.
- the rocker arm 2 is rotated around the shaft 7.
- the connection of the cavity 8 with the lubrication of the bearing 3 by the use of the conduct 9 is shut off to keep the volume of fluid in the at least one cavity 8 essentially constant.
- Fig. 4a and 4b show a further exemplary embodiment of an inventive valve train 1.
- a helical valve 18 is provided inside the shaft 7.
- This helical valve 18 is connected to the bearing 3 by a bore 19, which is used as fluid reservoir.
- the helical calve is connected to a flexible pipe 16, which is located inside the conduct 9 and connects the bore 17/the helical valve 18 with the cavity 8.
- Fig. 4a shows a fist position (a non-actuated position) of the helical valve 18 and the valve train 1, wherein the valve 6 of the internal combustion engine is closed.
- the fluid supply in this example the bore 19 together with the bearing 3
- the conduct 9 more specifically through the flexible pipe 16 placed inside the conduct 9.
- Fig. 4b shows a second position (an actuated or actuating position) of the helical valve 18 and the valve train 1, wherein the valve 6 of the internal combustion engine is opening or open.
- the rocker arm 2 and/or the helical valve 18 have been rotated around the shaft 7 (relative to Fig 4a ).
- the connection between the cavity 8 and the fluid supply (in this example the bore 19 together with the bearing 3) through the conduct 9, more specifically through the flexible pipe 16 placed inside the conduct 9, has been shut off by the helical valve 18.
- Fig. 5a and 5b are show an embodiment of the invention, wherein the recess 15 on the surface of the shaft 7 extends over a radial section and tapers axially.
- the shaft 7 is axially movably mounted with respect to the shaft 7 and the bearing 3. This gives the possibility of variable valve timing.
- An opening time of the valve 6 can be varied by moving the shaft 7 axially.
- the recess 15 has a small extension on the surface of the shaft 7. If the rocker arm 2 rotates around the shaft 7 from a first (non-actuated) position into a second (actuated or actuating) position this would correspond to the already described functionality of Fig. 1 to 3b .
- Fig. 6a shows an exemplary embodiment, wherein a valve bridge 20 is provided for actuating at least two vales 6.
- the cavity 8 is arranged in the valve bridge.
- the cavity 8 is closed in a similar way to the above described embodiments by a valve actuating element 5.
- the valve bridge 20 is activated by a rocker arm 2. Inside the valve bridge 20 a conduct 21 is provided to connect the cavity 8 with a fluid supplier (in this case the fluid supplier is a conduct 9 inside the rocker arm 2).
- the opening and shutting off of the connection between the cavity 8 and fluid supplier in Fig. 6a is performed according to the same principle as described in connection with Fig 4 or 5 .
- a valve bridge guide 22 is provided to guarantee the position of the valve bridge 20. This valve bridge guide 22 can plunge into the valve bridge 20 depending on the actual position of the valve bridge 20.
- Fig. 6b shows an embodiment, wherein the valve bridge guide 22 from Fig. 6a is used as supply-pin 24, supplying the cavity 8 with the help of the supply-pin conduct 25.
- This supply-pin conduct 25 leads in a non-actuated position (first position) of the valve bridge 20 into the conduct 21, which is connected to the cavity 8. If the valve bridge 20 is moved into an activated position the supply-pin 24 plunge into the valve bridge 20 and the connection between conduct 21 and supply-pin conduct 25 is shut off.
- the supply-pin 24 is a rotational symmetrical element comprising an opening on a connection section between the supply-pin 24 and the at valve bridge 20 (as shown by the detail supply-pin cross section 23), extending in a moving direction of the valve bridge 20 and tapering in a direction normal to a moving direction of the valve bridge.
- the valve opening times can be variated (as already explained in connection with Fig. 5a and 5b ) by rotating the supply-pin 24 around its own axis of symmetry.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Valve train (1) for an internal combustion engine, comprising:
- at least one rocker arm (2), wherein the at least one rocker arm (2) is mounted at a bearing (3) and wherein the at least one rocker arm (2) can be moved around the bearing (3) by an actuating element (4)
- at least one valve actuating element (5), wherein the at least one valve actuating element (5) can be moved by the at least one rocker arm (2) and wherein at least one valve (6) can be actuated by this movement of the at least one valve actuating element (5),
wherein a fluid element is arranged between the at least one valve actuating element (5) and the at least one rocker arm (2), wherein
- the fluid element comprises at least one cavity (8) for a fluid
- the volume of the fluid in the at least one cavity (8) can be varied by moving a piston and
- the at least one valve actuating element (5) constitutes or is mounted on the piston.
- at least one rocker arm (2), wherein the at least one rocker arm (2) is mounted at a bearing (3) and wherein the at least one rocker arm (2) can be moved around the bearing (3) by an actuating element (4)
- at least one valve actuating element (5), wherein the at least one valve actuating element (5) can be moved by the at least one rocker arm (2) and wherein at least one valve (6) can be actuated by this movement of the at least one valve actuating element (5),
wherein a fluid element is arranged between the at least one valve actuating element (5) and the at least one rocker arm (2), wherein
- the fluid element comprises at least one cavity (8) for a fluid
- the volume of the fluid in the at least one cavity (8) can be varied by moving a piston and
- the at least one valve actuating element (5) constitutes or is mounted on the piston.
Description
- This invention relates to a valve train for an internal combustion engine with the features of the preamble of
claim 1, an internal combustion engine comprising such a valve train and a method for operating a valve train. - Internal combustion engines, as known from the state of the art, use valve elements to control the intake of fuel and gas to the combustion engine. After the combustion process, wherein the fuel air mixture is burned, further valves are used to control the outlet of exhaust gases produced within the combustion.
- These valves have a clearance between valve and valve seat because during engine operation the valves heat up. On account of the thermal expansion the valve stretches and the clearance between valve and valve seat ensures a save function of the valve train. During the life time of the internal combustion engine the valve seats are strongly loaded by high temperatures and passing by particles. This passing by particles cause abrasive wear on the one side and do deposits on the other hand. The clearance between valve and valve seat is increased or decreased during engine life time. This clearance is also called valve lash. If the clearance between valve and valve seat is too large or to little the fuel consumption increases, the performance decreases, the emissions increase, the compression decreases and/or the temperature of the valve increases until they damage just to name a few examples.
- To ensure that the valve lash does not decrease too much it is necessary to adjust the valve lash after a given period of operating hours.
- This valve lash adjustment requires a great effort in time because each valve has to be adjusted by hand with the help of a feeler gauge. In use of large combustion engines, comprising a plurality of combustion chambers, wherein each combustion chamber is provided with a plurality of valves, the valve lash adjustment can take several hours.
- It is an object of the invention to provide a valve train for an internal combustion engine and an internal combustion engine comprising such a valve train with extended maintenance periods, in other words a valve train which needs a smaller amount of or no maintenance work regarding the valve lash adjustment.
- This object is being accomplished by a valve train for an internal combustion engine having the features of
claim 1, by an internal combustion engine comprising such a valve train according toclaim 13 and an method for operating a valve train according toclaim 14. Advantageous embodiments of the invention are defined in the dependent claims. - According to the invention there is provided a fluid element between the at least one valve actuating element and the at least one rocker arm, wherein
- the fluid element comprises at least one cavity for a fluid
- the volume of the fluid in the at least one cavity can be varied by moving a piston and
- the at least one valve actuating element constitutes or is mounted on the piston.
- The at least one valve actuating element can preferably be a configured to move translationally. Alternatively it can be configured to move in a rotating manner.
- It can be provided that the at least one cavity is in fluid communication with a fluid supplier through a conduct. In a particularly preferred variant it can be provided the conduct is a bore arranged in the rocker arm. It can also be provided that an orifice and a drain are provided instead of the bore.
- It can also be provided that the fluid is a lubricant, preferably oil. In addition it is also possible that the at least one rocker arm is actuating more than one valve.
- In a particularly preferred embodiment it can be provided that the at least one cavity is arranged at least partially, preferably fully, in the at least one rocker arm. It can also be provided that the piston is used as the at least one valve actuating element.
- In a preferred embodiment of the invention it can be provided that at least one cam shaft is provided, wherein the cam shaft has at least one cam and is rotatable. It can also be provided that at least one cam follower is provided, which cam follower is arranged at the at least one cam, which converts a rotational movement of the cam shaft into a translational movement, which translational movement can be transferred by the cam follower, which works as actuating element or by use of actuating element to transfer, to the rocker arm.
- In accordance with a particularly preferred embodiment it can be provided that a lubrication of the at least one bearing is provided, wherein a fluid for the lubrication of the at least one bearing is provided, which corresponds to the fluid used in the at least one cavity and wherein the lubrication of the bearing serves as the fluid supply.
- Alternatively or additionally it can also be provided that the volume of the fluid in the at least one cavity can be varied in a non-actuated position of the at least one valve.
- In a particularly preferred variant it can be provided that the conduct of the at least one cavity can be closed in such a way, that a volume of the fluid in the at least one cavity can be held essentially constant in an actuated and/or during an actuating movement of the at least one valve.
- In a preferred embodiment of the invention it can be provided at least one valve bridge is provided for actuating at least two valves, wherein the at least one cavity is preferably arranged between the at least one valve bridge and the at least one valve. It can also be provided that the at least one cavity is arranged at least partially, preferably fully, in the at least one valve bridge. In a particularly preferred embodiment it can be provided that a conduct is arranged in the at least one valve bridge to connect the at least one cavity with the fluid supplier. It can also be provided that the conduct can be closed at least partially according to a position of the at least one valve bridge, preferably can be closed in an actuated position of the valve bridge. In this case the activated position is an open position of the at least one valve and the non-activated position is a closed position of the at least one valve.
- In a preferred embodiment of the invention it can be provided that the at least one bearing has a shaft, wherein the bearing allows a rotational movement of the at least one rocker arm around the shaft. This means that the shaft stays in his position (does not rotate) and the at least one rocker arm (mounted on the shaft) could rotate around the shaft axis. In accordance with a particularly preferred embodiment it can be provided that a lubrication is provided between the shaft and the at least one rocker arm, wherein the conduct connects the at least one cavity with the bearing.
- It can also be provided that at the at least one conduct, connecting the at least one cavity with a reservoir, has at least one check valve, wherein the check valve only allows a unidirectional fluid motion.
- It can also be provided that the at least one recess is provided on a surface of the shaft, which is configured to
- connect in a fist position of the rocker arm relative to the shaft the at least one cavity with the lubrication of the bearing by the use of the conduct
- shut off in a second position of the rocker arm relative to the shaft the connection of the at least one cavity with the lubrication of the bearing by the use of the conduct to keep the volume of fluid in the at least one cavity essentially constant.
- These positions (first and second position) are different positions, which can be done by the rocker arm by a rational movement around the shaft.
- Alternatively or additionally it can also be provided that the at least one shaft recess on a surface of the shaft extends over a radial section. In accordance it can be provided that that the extending radial section of the shaft recess tapers axially and the shaft is movable axially with respect to the rocker arm.
- In another example for an embodiment of the present invention a blocking element is provided centrally in the shaft. The shaft has in this embodiment a bore, connecting the blocking element with the at least one conduct leading to the at least one cavity. The blocking element can be moved from a first position to a second position, wherein the blocking element connects the at least one cavity in a first position with a reservoir/fluid supply and wherein the blocking element blocks (interrupts) the fluid communication between the at least one cavity and the reservoir/fluid supply. In a preferred embodiment the blocking element is a rotationally symmetric element arranged in the shaft, which can be rotated between a first and a second position.
- In a particularly preferred variant it can be provided at least one supply-pin is provided, supplying the at least one cavity with fluid. It can be provided that there is a supply pipe inside the supply-pin, supplying the at least one cavity with fluid. In a preferred embodiment of the invention it can be provided that the at least one rocker arm or the at least one valve bridge has at least one supply-pin plunging recess, in which the at least one supply-pin can plunge at least partially. It can also be provided that that the at least one supply-pin serves as fluid supplier. It can be provided that
- in a fist position of the at least one rocker arm or the at least one valve bridge relative to the supply pin the at least one cavity is connected by the conduct with the supply-pin
- in a second position of the at least one rocker arm or the at least one valve bridge relative to the supply pin the at least one cavity is not linked with the supply-pin.
- Alternatively or additionally it can also be provided that the supply-pin is a rotationally symmetrical element and comprises a connecting section between the supply-pin and the at least one rocker arm or the at least one valve bridge and an opening thereon extending in a moving direction of the at least one rocker arm or the at least one valve bridge. By rotating the rotationally symmetrical supply pin clock wise or anti clock wise a duration can be varied, wherein the at least one cavity is connected with the supply/reservoir. It can also be provided that the opening tapers in a direction normal to a moving direction of the at least one rocker arm or the at least one valve bridge and the at least one supply pin is movable in the direction normal to the moving direction of the at least one rocker arm or the at least one valve bridge.
- Furthermore protection is sought for an internal combustion engine, preferably a stationary gas engine comprising a valve train according to the invention
- Protection is also sought for a method for operating a valve train, wherein at least one valve is actuated by at least one valve actuating element and the at least one valve actuating element is moved by at least one rocker arm, wherein the position of the at least one valve actuating element relative to the at least one valve is adjusted by varying a volume of fluid in a fluid element and thereby automatically adjusting valve lash or automatically avoiding valve lash.
- The invention will now be described in greater detail by means of the Figures in which:
- Fig. 1
- shows a fist embodiment of the invention,
- Fig. 2a
- shows a cross section of the particular embodiment of
Fig. 1 , - Fig. 2b
- shows the embodiment of
Fig. 1 in more detail, - Fig. 3a
- shows the embodiment of
Fig. 1 in a first position, - Fig. 3b
- shows the embodiment of
Fig. 1 in a second position, - Fig. 4a
- shows a further particular embodiment of the invention in a first position,
- Fig. 4b
- shows the particular embodiment of
Fig. 4a in a second position, - Fig. 5a
- shows a particular embodiment of the invention in connection with variable valve timing,
- Fig. 5b
- shows a particular embodiment of the invention in connection with variable valve timing,
- Fig. 6a
- shows an exemplary embodiment, wherein a valve bridge is provided,
- Fig. 6a
- shows an embodiment of the invention, wherein a valve bridge and a supply-pin are provided.
-
Fig. 1 shows a fist embodiment of the invention. The shownvalve train 1 for an internal combustion engine comprises arocker arm 2 mounted at abearing 3. Therocker arm 2 can be moved around thebearing 3 by anactuating element 4. Therocker arm 3 comprises further avalve actuating element 5, which is configured to actuate avalve 6. For reasons of simplicity thevalve 6 is not shownFig. 1 . Thevalve actuating element 5 can be moved by therocker arm 2 and the at least onevalve 6 of the internal combustion engine can be moved by thevalve actuating element 5. Thebearing 3 is mounted rotationally movable on ashaft 7. - According to the invention there is also provided a
cavity 8 for fluid. In this embodiment thiscavity 8 is released as a bore in therocker arm 2. Together with thevalve actuating element 5 in the form of a piston thiscavity 8 delimits a volume, which is filled by a fluid. The volume of thecavity 8 can be varied by moving thevalve actuating element 5 relative to therocker arm 2. Thecavity 8 is connected by aconduct 9 with thebearing 3 of therocker arm 2. - The
bearing 3 of therocker arm 2 is used in this embodiment as fluid supplier. In this way fluid, which is used for the lubrication of thebearing 3, can be used in thecavity 8. The fluid supplier supplies fluid to thecavity 8. If fluid is passed back through theconduct 9 the fuel supplier is used as fluid reservoir. Theconduct 9 is released as a bore in therocker arm 3. The end of the bore, which forms thecavity 9, is closed by agrub screw 10. - The fluid communication of the
cavity 8 with thebearing 3 through theconduct 9 can be cut off by a movement of therocker arm 2 around theshaft 7, because theconduct 9 connected to thebearing 3 through thebore 11 in theshaft 7 of thebearing 3. If therocker arm 2 moves rotationally relative to theshaft 7 and thebearing 3. Through such a rotation (in order to activate the valve 6) theconduct 9 is moved away from the supply bore 11. In this situation (where no fluid communication betweencavity 8 and fluid supplier is given) the volume of the fluid in thecavity 8 cannot be varied and thevalve actuating element 5 cannot be moved relative to therocker arm 3. - On the other hand, when the
rocker arm 3 is not actuated, and therefore rests in a position where theconduct 9 and thebore 11 are lined up, the fluid communication is present. E.g. through a spring action the actuating element can then be moved to a position without valve lash through a change of the volume of the fluid in thecavity 8. - In this way it is possible for the
valve actuating element 5 to adjust a valve drift (caused by the wear of the valve seat) in a position, wherein thecavity 8 is in fluid communication with the fluid supplier. This position corresponds in this embodiment to a non-actuated position of thevalve 6. In all other positions (an actuated or actuating position of the valve 6) a moving of thevalve actuating element 5 relative to therocker arm 3 is prevented by the blocking of theconduct 9, thereby allowing the actuation of thevalve 6. - The
cavity 8 is connected to the external environment by anorifice 12. Theorifice 12 can be replaced by a sealing element to be installed after system de-airing/bleeding. This avoids special requirements on oil cleanliness if oils are used as fluid. - In this embodiment a lubrication fluid from the
bearing 3 is used for thecavity 8. In particular the lubrication fluid is oil. -
Fig 2a shows cross section of the particular embodiment ofFig. 1 . This cross section shown byFig. 2a gives an example how the lubrication fluid for the bearing 3 (which is also used in the cavity 8) can be supplied. Theactuating element 4 contacts thepush rod 14. Thispush rod 14 transmits an alternating transversal movement (created by a camshaft for example) to theactuating element 4. Furthermore thepush rod 14 shown can be used as fluid supplier, wherein thepush rod 14 has a central bore conveying lubrication fluid to theactuating element 4. Theactuating element 4 does also have a central bore leading the lubrication fluid from thepush rod 14 to abore 13 in therocker arm 2. This bore 13, placed in therocker arm 2 finally supplies the lubrication fluid to thebearing 3. - In the embodiments shown by the figures the
shaft 7 is fixed, i.e. not rotatable (per definition a pivot pin). Therocker arm 2 is pivoting around this pin. -
Fig. 2b shows in more detail thebore 11 in thebearing 3 which can be used to cut off the fluid communication with thecavity 8. For this arecess 15 is provided on the surface of theshaft 7, which is configured to connect in a first position (shown byFig 2b and3a ) of therocker arm 2 relative to theshaft 7 thecavity 8 with lubrication of thebearing 3 by use of theconduct 9. In this example thebearing 3 is provided with a ring (shown in darker gray), which is fixed on theshaft 7 and has abore 11. - But it also can be provided that the
bearing 3 is released as a hydrostatic bearing, wherein no separate element would be used for thebearing 3, only the pressure of the lubrication would cause a separate layer of lubrication forming the bearing 3 (distance betweenrocker arm 2 and shaft 7). If thebearing 3 is done by a hydrostatic bearing (also a hydrodynamic bearing would be possible) theconduct 9 would have a tubular element between the inner wall of the rocker arm and the outer surface of the shaft. This would only allow a fluid connection betweenbearing 3 andcavity 8 if the conduct 9 (with his tubular element) would be positioned in alignment over therecess 15. In all other positions (when theconduct 9 is not positioned over the recess 15) there would be no fluid communication betweenbearing 3 andcavity 8. -
Fig 3a shows the described embodiment ofFig. 1 andFig. 2 in a first (non-actuated) position.Fig 3b sows the embodiment ofFig. 1 and2 in a second (actuated) position. Therefor therocker arm 2 is rotated around theshaft 7. In this second position of therocker arm 2 relative to theshaft 7 the connection of thecavity 8 with the lubrication of thebearing 3 by the use of theconduct 9 is shut off to keep the volume of fluid in the at least onecavity 8 essentially constant. -
Fig. 4a and 4b show a further exemplary embodiment of aninventive valve train 1. In this embodiment ahelical valve 18 is provided inside theshaft 7. Thishelical valve 18 is connected to thebearing 3 by abore 19, which is used as fluid reservoir. With afurther bore 17 the helical calve is connected to aflexible pipe 16, which is located inside theconduct 9 and connects thebore 17/thehelical valve 18 with thecavity 8. -
Fig. 4a shows a fist position (a non-actuated position) of thehelical valve 18 and thevalve train 1, wherein thevalve 6 of the internal combustion engine is closed. In this first position the of therocker arm 3 relative to theshaft 7 thecavity 8 is connected with the fluid supply (in this example thebore 19 together with the bearing 3) through theconduct 9, more specifically through theflexible pipe 16 placed inside theconduct 9. -
Fig. 4b shows a second position (an actuated or actuating position) of thehelical valve 18 and thevalve train 1, wherein thevalve 6 of the internal combustion engine is opening or open. In this second position therocker arm 2 and/or thehelical valve 18 have been rotated around the shaft 7 (relative toFig 4a ). The connection between thecavity 8 and the fluid supply (in this example thebore 19 together with the bearing 3) through theconduct 9, more specifically through theflexible pipe 16 placed inside theconduct 9, has been shut off by thehelical valve 18. -
Fig. 5a and 5b are show an embodiment of the invention, wherein therecess 15 on the surface of theshaft 7 extends over a radial section and tapers axially. Theshaft 7 is axially movably mounted with respect to theshaft 7 and thebearing 3. This gives the possibility of variable valve timing. An opening time of thevalve 6 can be varied by moving theshaft 7 axially. In a position as shown inFig. 5a therecess 15 has a small extension on the surface of theshaft 7. If therocker arm 2 rotates around theshaft 7 from a first (non-actuated) position into a second (actuated or actuating) position this would correspond to the already described functionality ofFig. 1 to 3b . - But if the shaft is moved axially into a position as shown by
Fig. 5b the fluid connection between thecavity 8 and the fluid supplier (in this case the bearing 3) through theconduct 9 can be extended from the first (non-actuated) position. This connection can be kept till theconduct 9 leaves the last position in alignment with therecess 15 through the rotational movement of therocker arm 2 relative to theshaft 7 during an actuating movement. Even if therocker arm 2 is at the start of the actuating movement in movement thevalve 6 is still not moved, because fluid can still leak form thecavity 8 through theconduct 9 into thebearing 3 by the help of therecess 15. Thevalve 6 presses thevalve actuating element 5 intocavity 8. So to say the movement of therocker arm 2 is compensated by the movement of thevalve actuating element 5 into thecavity 8 till theconduct 9 moves over therecess 15. -
Fig. 6a shows an exemplary embodiment, wherein avalve bridge 20 is provided for actuating at least twovales 6. In this embodiment thecavity 8 is arranged in the valve bridge. Thecavity 8 is closed in a similar way to the above described embodiments by avalve actuating element 5. Thevalve bridge 20 is activated by arocker arm 2. Inside the valve bridge 20 aconduct 21 is provided to connect thecavity 8 with a fluid supplier (in this case the fluid supplier is aconduct 9 inside the rocker arm 2). The opening and shutting off of the connection between thecavity 8 and fluid supplier inFig. 6a is performed according to the same principle as described in connection withFig 4 or5 . Avalve bridge guide 22 is provided to guarantee the position of thevalve bridge 20. Thisvalve bridge guide 22 can plunge into thevalve bridge 20 depending on the actual position of thevalve bridge 20. -
Fig. 6b shows an embodiment, wherein the valve bridge guide 22 fromFig. 6a is used as supply-pin 24, supplying thecavity 8 with the help of the supply-pin conduct 25. This supply-pin conduct 25 leads in a non-actuated position (first position) of thevalve bridge 20 into theconduct 21, which is connected to thecavity 8. If thevalve bridge 20 is moved into an activated position the supply-pin 24 plunge into thevalve bridge 20 and the connection betweenconduct 21 and supply-pin conduct 25 is shut off. - It can be provided that the supply-
pin 24 is a rotational symmetrical element comprising an opening on a connection section between the supply-pin 24 and the at valve bridge 20 (as shown by the detail supply-pin cross section 23), extending in a moving direction of thevalve bridge 20 and tapering in a direction normal to a moving direction of the valve bridge. In this way the valve opening times can be variated (as already explained in connection withFig. 5a and 5b ) by rotating the supply-pin 24 around its own axis of symmetry. -
- 1
- valve train
- 2
- rocker arm
- 3
- bearing
- 4
- actuating element
- 5
- valve actuating element
- 6
- valve
- 7
- shaft
- 8
- cavity
- 9
- conduct
- 10
- grub screw
- 11
- bore
- 12
- orifice
- 13
- bore
- 14
- push rod
- 15
- recess
- 16
- pipe
- 17
- bore
- 18
- helical valve
- 19
- bore
- 20
- valve bridge
- 21
- conduct
- 22
- valve bridge guide
- 23
- supply-pin cross section
- 24
- supply-pin
- 25
- supply-pin conduct
Claims (15)
- Valve train (1) for an internal combustion engine, comprising:- at least one rocker arm (2), wherein the at least one rocker arm (2) is mounted at a bearing (3) and wherein the at least one rocker arm (2) can be moved around the bearing (3) by an actuating element (4)- at least one valve actuating element (5), wherein the at least one valve actuating element (5) can be moved by the at least one rocker arm (2) and wherein at least one valve (6) of an internal combustion engine can be moved by this movement of the at least one valve actuating element (5)characterized in that a fluid element is arranged between the at least one valve actuating element (5) and the at least one rocker arm (2), wherein
the fluid element comprises at least one cavity (8) for a fluid,
wherein the volume of the fluid in the at least one cavity (8) can be varied by varying the position of the at least one valve actuating element (5) relative to the at least one rocker arm (2). - Valve train for an internal combustion engine according to claim 1, characterized in that the at least one cavity (8) is in fluid communication with a fluid supplier through a conduct (9).
- Valve train for an internal combustion engine according to claim 2, characterized in that the conduct is a bore arranged in the rocker arm (2).
- Valve train for an internal combustion engine according to any of claims 2 - 3, characterized in that a lubrication of the at least one bearing (3) is provided, wherein a fluid for the lubrication of the at least one bearing (3) is provided, which corresponds to the fluid used in the at least one cavity (8) and wherein the lubrication of the bearing (3) serves as the fluid supply.
- Valve train for an internal combustion engine according to preceding claim, characterized in, that the piston is used as the at least one valve actuating element (5).
- Valve train for an internal combustion engine according to any of the preceding claims, characterized in that the volume of the fluid in the at least one cavity (8) can be varied in a non-actuated position of the at least one valve (6).
- Valve train for an internal combustion engine according to any of the claims 2 - 6, characterized in that the conduct (9) of the at least one cavity (8) can be closed in such a way, that a volume of the fluid in the at least one cavity (8) can be held essentially constant in an actuated and/or during an actuating movement of the at least one valve (6).
- Valve train for an internal combustion engine according to any of the preceding claims, characterized in that at least one valve bridge (20) is provided for actuating at least two valves (6), wherein the at least one cavity (8) is preferably arranged between the at least one valve bridge (20) and the at least one valve (6).
- Valve train for an internal combustion engine according to claim 2 as well as 8 characterized in, that a conduct (21) is arranged in the at least one valve bridge (20) to connect the at least one cavity (8) with the fluid supplier.
- Valve train for an internal combustion engine according to claim 9, characterized in that the conduct (21) can be closed at least partially according to a position of the at least one valve bridge (20), preferably can be closed in an actuated position of the valve bridge (20).
- Valve train for an internal combustion engine according to claim 3 and 5, characterized in that the at least one bearing (3) has a shaft (4), wherein the bearing (3) allows a rotational movement of the at least one rocker arm (2) around the shaft (4) and wherein a lubrication is provided between the shaft (4) and the at least one rocker arm (2), wherein the conduct (9) connects the at least one cavity (8) with the bearing (3).
- Valve train for an internal combustion engine according to any of the preceding claims, characterized in, that at least one supply-pin (24) is provided, supplying the at least one cavity (8) with fluid.
- Valve train for an internal combustion engine according to claim 11, characterized in, that the at least one rocker arm (2) or the at least one valve bridge (20) has at least one supply-pin plunging recess, in which the at least one supply-pin (24) can plunge at least partially.
- Internal combustion engine, preferably a stationary gas engine comprising a valve train (1) according to any of the preceding claims.
- Method for operating a valve train (1), in particular according to at least one of the claims 1 to 12, wherein at least one valve (6) is actuated by at least one valve actuating element (5) and the at least one valve actuating element (5) is moved by at least one rocker arm (2), characterized in that the position of the at least one valve actuating element (5) relative to the at least one valve (6) is adjusted by varying a volume of fluid in a fluid element and thereby automatically adjusting valve lash or automatically avoiding valve lash.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17207245.6A EP3498989A1 (en) | 2017-12-14 | 2017-12-14 | Valve train for an internal combustion engine |
US16/220,015 US20190257219A1 (en) | 2017-12-14 | 2018-12-14 | Valve train for an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17207245.6A EP3498989A1 (en) | 2017-12-14 | 2017-12-14 | Valve train for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
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EP3498989A1 true EP3498989A1 (en) | 2019-06-19 |
Family
ID=60673550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17207245.6A Withdrawn EP3498989A1 (en) | 2017-12-14 | 2017-12-14 | Valve train for an internal combustion engine |
Country Status (2)
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US (1) | US20190257219A1 (en) |
EP (1) | EP3498989A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11242774B2 (en) * | 2019-09-20 | 2022-02-08 | Caterpillar Inc. | Rocker assembly with a hydraulic lash adjuster |
WO2021110250A1 (en) | 2019-12-04 | 2021-06-10 | Wärtsilä Finland Oy | An assembly for transmitting force from a rocker arm to an end of two valve stems in an internal combustion piston engine |
EP3832076B1 (en) | 2019-12-04 | 2022-08-10 | Wärtsilä Finland Oy | An assembly for transmitting force from a rocker arm to ends of two valve stems in an internal combustion piston engine |
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JPS61192803A (en) * | 1985-02-22 | 1986-08-27 | Fuji Heavy Ind Ltd | Lash adjustor apparatus |
DE19741078A1 (en) * | 1997-09-18 | 1999-03-25 | Schaeffler Waelzlager Ohg | Turning or tilting lever for internal combustion engine valve drive |
US6253730B1 (en) * | 2000-01-14 | 2001-07-03 | Cummins Engine Company, Inc. | Engine compression braking system with integral rocker lever and reset valve |
US20110079195A1 (en) * | 2009-10-02 | 2011-04-07 | Man Nutzfahrzeuge Ag | Internal Combustion Engine Having A Motor Brake Assembly |
US8578901B2 (en) * | 2004-03-15 | 2013-11-12 | Jacobs Vehicle Systems, Inc. | Valve bridge with integrated lost motion system |
WO2014001560A1 (en) * | 2012-06-29 | 2014-01-03 | Eaton Srl | Valve bridge |
DE102015211124A1 (en) * | 2015-06-17 | 2016-12-22 | Schaeffler Technologies AG & Co. KG | Valve gear of a reciprocating internal combustion engine |
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US4727832A (en) * | 1986-06-13 | 1988-03-01 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Roller rocker arm |
US6125828A (en) * | 1995-08-08 | 2000-10-03 | Diesel Engine Retarders, Inc. | Internal combustion engine with combined cam and electro-hydraulic engine valve control |
US5975251A (en) * | 1998-04-01 | 1999-11-02 | Diesel Engine Retarders, Inc. | Rocker brake assembly with hydraulic lock |
DE19858213A1 (en) * | 1998-12-17 | 2000-06-21 | Man Nutzfahrzeuge Ag | Hydraulic valve operating system for cylinder head with integrated play leveling, in which valve bridge has mass inertia valve |
ATE484666T1 (en) * | 1999-12-20 | 2010-10-15 | Jacobs Vehicle Systems Inc | METHOD AND DEVICE FOR HYDRAULIC COUPLING AND UNCOUPLING OF AN ENGINE BRAKE USING LOST MOTION |
DE102008032775A1 (en) * | 2008-07-11 | 2010-01-14 | Man Nutzfahrzeuge Aktiengesellschaft | Internal combustion engine with an engine brake device and a valve clearance compensation mechanism |
EP2677127B1 (en) * | 2011-02-15 | 2017-11-15 | Xi, Yong | Method and apparatus for resetting valve lift for use in engine brake |
BR112017005467B1 (en) * | 2014-09-18 | 2022-05-17 | Eaton Srl | Exhaust valve rocker assembly |
-
2017
- 2017-12-14 EP EP17207245.6A patent/EP3498989A1/en not_active Withdrawn
-
2018
- 2018-12-14 US US16/220,015 patent/US20190257219A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS61192803A (en) * | 1985-02-22 | 1986-08-27 | Fuji Heavy Ind Ltd | Lash adjustor apparatus |
DE19741078A1 (en) * | 1997-09-18 | 1999-03-25 | Schaeffler Waelzlager Ohg | Turning or tilting lever for internal combustion engine valve drive |
US6253730B1 (en) * | 2000-01-14 | 2001-07-03 | Cummins Engine Company, Inc. | Engine compression braking system with integral rocker lever and reset valve |
US8578901B2 (en) * | 2004-03-15 | 2013-11-12 | Jacobs Vehicle Systems, Inc. | Valve bridge with integrated lost motion system |
US20110079195A1 (en) * | 2009-10-02 | 2011-04-07 | Man Nutzfahrzeuge Ag | Internal Combustion Engine Having A Motor Brake Assembly |
WO2014001560A1 (en) * | 2012-06-29 | 2014-01-03 | Eaton Srl | Valve bridge |
DE102015211124A1 (en) * | 2015-06-17 | 2016-12-22 | Schaeffler Technologies AG & Co. KG | Valve gear of a reciprocating internal combustion engine |
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US20190257219A1 (en) | 2019-08-22 |
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