EP3146185B1 - Heavy duty valvetrain with de-compression engine brake feature - Google Patents
Heavy duty valvetrain with de-compression engine brake feature Download PDFInfo
- Publication number
- EP3146185B1 EP3146185B1 EP15723509.4A EP15723509A EP3146185B1 EP 3146185 B1 EP3146185 B1 EP 3146185B1 EP 15723509 A EP15723509 A EP 15723509A EP 3146185 B1 EP3146185 B1 EP 3146185B1
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- EP
- European Patent Office
- Prior art keywords
- rocker arm
- engine brake
- arm assembly
- exhaust valve
- assembly
- 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.)
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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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
- F01L1/26—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
- F01L1/267—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 with means for varying the timing or the lift of the valves
Definitions
- the present disclosure relates generally to a rocker arm assembly for use in a valve train assembly and more particularly to a rocker arm assembly that incorporates a dedicated rocker arm that acts on a single exhaust valve to perform an engine brake function.
- CN203097985U shows an engine braking device with special cam for braking single valve.
- WO2012078280A1 shows engine braking devices and methods.
- WO2012162616A1 shows a primary and auxiliary rocker arm assembly for engine valve actuation.
- Compression engine brakes can be used as auxiliary brakes, in addition to wheel brakes, on relatively large vehicles, for example trucks, powered by heavy or medium duty diesel engines.
- a compression engine braking system is arranged, when activated, to provide an additional opening of an engine cylinder's exhaust valve when the piston in that cylinder is near a top-dead-center position of its compression stroke so that compressed air can be released through the exhaust valve. This causes the engine to function as a power consuming air compressor which slows the vehicle.
- the exhaust valve is actuated by a rocker arm which engages the exhaust valve by means of a valve bridge.
- the rocker arm rocks in response to a cam on a rotating cam shaft and presses down on the valve bridge which itself presses down on the exhaust valve to open it.
- a hydraulic lash adjuster may also be provided in the valve train assembly to remove any lash or gap that develops between the components in the valve train assembly.
- a dual exhaust rocker arm assembly constructed in accordance to one example of the present disclosure is operable in a combustion engine mode and an engine braking mode.
- the dual exhaust valve rocker arm assembly selectively opens first and second exhaust valves and includes a rocker shaft, an exhaust valve rocker arm assembly, an engine brake rocker arm assembly and an engine brake capsule.
- the exhaust valve rocker arm assembly has an exhaust rocker arm that receives the rocker shaft and is configured to rotate around the rocker shaft.
- the exhaust rocker arm further defines a bore having an inner diameter.
- the engine brake rocker arm assembly has an engine brake rocker arm.
- the engine brake capsule is slidably received along the inner diameter of the bore of the exhaust valve rocker arm.
- the engine brake capsule is selectively translatable upon urging by the engine brake rocker arm.
- the engine brake capsule urges one of the first and second exhaust valves open during engine braking mode.
- the dual exhaust valve rocker arm assembly further comprises an oil control valve that provides oil flow for actuation of the engine brake capsule from a pressurized oil supply.
- the engine brake capsule includes an engine brake capsule piston and an engine brake capsule body.
- a pressurized oil chamber is defined between the engine brake capsule piston and the engine brake capsule body.
- the engine brake rocker arm is configured to act on the engine brake capsule piston which acts on the engine brake capsule body which ultimately acts on one of the engine brake exhaust valves.
- the dual exhaust valve rocker arm assembly further comprises a valve tip positioned between one of the engine brake exhaust valves and the engine brake capsule body.
- a lock ball assembly can include a ball lock and a ball lock spring. The ball lock spring can urge the ball lock into a groove defined on the engine brake capsule body.
- a c-clip can be configured on the rocker arm assembly. The c-clip can limit a stroke of the engine brake capsule and provide a hard stop.
- the dual exhaust rocker arm assembly further includes an actuator assembly configured to move the engine brake capsule between an extended and a retracted position.
- the actuator assembly and the oil control valve are configured in the exhaust rocker arm separate from the engine brake capsule.
- the actuator assembly includes an actuator body, an actuator check ball, an actuator needle, an actuator return spring and an actuator locking nut.
- the actuator needle is configured to keep the actuator check ball in an open position and prevent oil pressure buildup in the engine brake capsule.
- the actuator check ball allows one-way replenishment at every cycle into the pressurized oil chamber.
- the oil control valve is energized open and oil pressure causes the actuator needle to move away from a corresponding seat such that the engine brake capsule is extended a predetermined length.
- the dual exhaust rocker arm assembly includes a first adjustment screw provided on the engine brake rocker arm and a second adjustment screw provided on the exhaust rocker arm. Both of the first and second adjustment screws are adjustable to selectively provide lash settings for the dual exhaust rocker arm assembly.
- Heavy duty (HD) diesel engines with single overhead cam (SOHC) valvetrain requires high braking power, in particular at low engine speed.
- the present disclosure provides an added motion type De-Compression engine brake. To provide high braking power without applying high load on the rest of the valvetrain (particularly the camshaft), the present disclosure provides a dedicated rocker arm for engine brake that acts on one exhaust valve. In this regard, half of the input load is experienced compared to other configurations that have two exhaust valves opening.
- a partial valve train assembly constructed in accordance to one example of the present disclosure is shown and generally identified at reference 10.
- the partial valve train assembly 10 utilizes engine braking and is shown configured for use in a three-cylinder bank portion of a six-cylinder engine. It will be appreciated however that the present teachings are not so limited. In this regard, the present disclosure may be used in any valve train assembly that utilizes engine braking.
- the partial valve train assembly 10 is supported in a valve train carrier 12 and can include three rocker arms per cylinder.
- each cylinder includes an intake valve rocker arm assembly 20, an exhaust valve rocker arm assembly 22 and an engine brake rocker arm assembly 24.
- the exhaust valve rocker arm assembly 22 and the engine brake rocker arm assembly 24 cooperate to control opening of the exhaust valves and are collectively referred to as a dual exhaust valve rocker arm assembly 26 ( FIG. 2 ).
- the intake valve rocker arm assembly 20 is configured to control motion of the intake valves.
- the exhaust valve rocker arm assembly 22 is configured to control exhaust valve motion in a drive mode.
- the engine brake rocker arm assembly 24 is configured to act on one of the two exhaust arms in an engine brake mode as will be described herein.
- a rocker shaft 34 is received by the valve train carrier 12 and supports rotation of the exhaust valve rocker arm assembly 22 and the engine brake rocker arm assembly 24.
- the exhaust valve rocker arm assembly 22 can generally include an exhaust rocker arm 40, a valve bridge 42, a spigot spigot assembly 44 and an engine brake capsule 46.
- the valve bridge 42 engages a first and second exhaust valve 50 and 52 ( FIG. 2 ) associated with a cylinder of an engine (not shown).
- the exhaust rocker arm 40 rotates around the rocker shaft 34 based on a lift profile of a cam shaft 54.
- the engine brake rocker arm assembly 24 can include an engine brake rocker arm 60 having an engaging portion 62.
- the engine brake rocker arm 60 rotates around the rocker shaft 34 based on a lift provide of the cam shaft 54.
- the configuration includes an oil control valve 70 that provides oil flow 72 for actuation from a pressurized oil supply 74.
- Pressurized oil chamber 78 is shown inside the engine brake capsule 46.
- the engine brake capsule 46 can include an engine brake capsule piston 80 and an engine brake capsule body 82.
- a valve tip pin 83 is positioned between the exhaust valve 52 and the engine brake capsule body 82.
- a c-clip 84 can provide a hard stop for the engine brake capsule body 82.
- An engine brake rocker arm schematic 90 represents the engine brake rocker arm assembly 24 rotating as a result of cam lobe breaking 92.
- An actuator assembly 100 includes an actuator body 102, an actuator check ball 104, an actuator needle 106, an actuator return spring 108 and an actuator locking nut 110.
- the oil control valve 70 is closed and the engine brake capsule body 82 is completely retracted having no influence on the exhaust valves 50 and 52 motion.
- the actuator needle 106 can keep the check ball 104 in an open position (away from corresponding seat 107) and prevent oil pressure buildup in the engine brake capsule 46.
- the motion of the engine brake rocker arm 60 ( FIG. 2 ), or represented in FIG. 3 as the rocker arm schematic 90 will have no effect on the motion of the exhaust valve 52 when the engine is in drive mode.
- the oil control valve 70 When the engine is in brake (no combustion) mode, the oil control valve 70 will be energized open and oil pressure will push back the actuator needle 106 and fill (extend) the engine brake capsule 46 for a predetermined length such as 4 mm. A gap between the engine brake rocker arm 60 (rocker arm schematic 90) and the exhaust valve 52 will be compensated so that motion of the engine brake rocker arm 60 controlled by the cam lobe 92 will create additional lift on the exhaust valve 52.
- the actuator check ball 104 will allow one-way oil replenishment at every cycle into the pressurized oil chamber 78.
- the needle 106 When de-energizing the oil control valve 70, the needle 106 will allow oil out from the pressurized oil chamber 78 and the engine brake capsule 46 will go back into a retracted position allowing driving mode (combustion) again.
- the engine brake rocker arm assembly 24 opens the exhaust valve 52 (positioned closer to the rocker shaft 34) providing favorable force ratio allowing higher braking power.
- the exhaust valve 52 is opened later in a compression stroke (close to top dead center), still with acceptable load on the cam lobe.
- FIG. 4 illustrates the engine brake capsule 46 expanded or extended.
- the gap between the engine brake capsule body 82 and the valve tip pin 83 is eliminated.
- FIG. 5 illustrates the engine brake at maximum lift.
- the exhaust rocker arm 40 is on the base circle while the engine brake rocker arm 60 controls the lift of the engine brake exhaust valve 52.
- the engine brake rocker arm 60 acts on the engine brake capsule piston 80, which acts on the engine brake capsule body 82, which acts on the valve tip pin 83, which acts on the engine brake exhaust valve 52.
- a ball lock assembly 150 includes a ball lock 152 and a ball lock spring 154.
- the ball lock spring 154 urges (identified by force F, FIG. 7 ) the ball lock 152 into a groove 160 defined on the outer diameter of the engine brake capsule body 82.
- the groove 160 has a depth 170 and a radius 172 configured to assure the engine brake capsule body 82 does not shake by its inertia, but rather under the load of the engine brake rocker arm 60 in engine brake mode.
- the ball lock assembly 150 will have no impact on the engine brake capsule piston 80 expansion or retraction time.
- a c-clip 180 is provided to limit the stroke of the engine brake capsule body 82. In this regard, the c-clip 180 provides a hard stop important for transportation.
- a first adjustment screw 210 is provided on the engine brake arm 60.
- a second adjustment screw 212 is provided on the exhaust arm 40.
- a third adjustment screw 214 is provided on the intake arm 20.
- Each of the first, second and third adjustment screws 210, 212 and 214 all provide valve lash settings according to one example of the present disclosure.
- the engine brake capsule 46 is pushed down (as viewed in FIG. 9 ) into the collapsed position (no oil) to zero the lash in the exhaust valve 52. From this position, the first adjustment screw 210 is re-winded for exhaust brake capsule stroke and lash on the same valve.
- the engine brake capsule 46 is made such that the difference between a fully collapsed and fully expanded length is within a narrow tolerance 220 (such as plus or minus 0.05 mm).
- a narrow tolerance 220 such as plus or minus 0.05 mm.
- Each of the first, second and third adjustment screws 210, 212 and 214 can have a common thread and nut size so that a common tool can be used for adjustment.
- actuation of engine brake function is controlled by pressurized engine oil by two oil control valves 70, one for each of the three cylinders (for the example shown in FIG. 1 ).
- the oil control valves 70 can be configured to operate independently.
- Valve actuation components for three cylinders are incorporated in one valvetrain carrier 12 ready to be assembled on a cylinder head.
- the configuration provides high performance engine braking without necessarily creating high load on valvetrain components by acting solely on one exhaust valve 52.
- a dedicated rocker arm engine brake rocker arm 60
- engine brake rocker arm 60 for engine brake, favorable rocker and force ratio transmitting lower load on the rocker shaft 34 and camshaft 54.
- the engine brake capsule 46 is installed in and guided by an inner diameter 190 ( FIG. 6 ) defined in the exhaust rocker arm 40.
- the present disclosure includes an engine brake capsule 46 configured in the exhaust rocker arm 40 (instead of in the engine brake rocker arm 60).
- the configuration provides favorable packaging advantages.
- the engine brake capsule 46 is configured to move freely along the inner diameter 190 in the exhaust rocker arm 40 while being controlled by the engine brake rocker arm 60.
- the configuration of the present disclosure provides actuation control from the actuator assembly 100 to move the engine brake capsule 46 between an extended and retracted position.
- the actuator assembly 100 and the oil control valve 70 ( FIG. 3 ) are configured in the exhaust rocker arm 40 and are separate from the engine brake capsule 46.
- the ball lock assembly 150 provides drive mode retention of the engine brake capsule body 82 in drive mode.
- FIG. 10 shows the exhaust rocker arm 40 and the engine brake rocker arm 60 on the base circle of the cam shaft 54.
- the engaging portion 62 of the engine brake engine brake rocker arm 60 is disengaged with the engine brake capsule piston 80.
- the engine brake capsule 46 is collapsed.
- the schematic of FIG. 11 corresponds to the position of the dual exhaust valve rocker arm assembly 26 in FIG. 10 .
- the oil control valve 70 is closed draining open.
- the check ball 104 is in an open position away from its seat 107.
- FIG. 12 shows the exhaust rocker arm 40 on maximum lift of the cam shaft 54 and the engine brake rocker arm 60 on the base circle of the cam shaft 54.
- the engaging portion 62 of the engine brake rocker arm 60 is disengaged with the engine brake capsule piston 80.
- An exhaust brake rocker arm lost motion spring 232 keeps the engine brake rocker arm 60 against the camshaft 54.
- the engine brake capsule 46 is collapsed.
- the schematic of FIG. 13 corresponds to the position of the dual exhaust valve rocker arm assembly 26 in FIG. 12 .
- the oil control valve 70 is closed draining open.
- the check ball 104 is in an open position away from its seat 107.
- FIG. 14 shows the exhaust rocker arm 40 on the base circle of the cam shaft 54 and the engine brake rocker arm 60 on the base circle of the cam shaft 54.
- the engaging portion 62 of the engine brake rocker arm 60 is engaged with the engine brake capsule piston 80.
- the engine brake capsule 46 is expanded such that engine brake capsule body 82 touches the valve tip 83 on the valve bridge 42.
- the schematic of FIG. 15 corresponds to the position of the dual exhaust valve rocker arm assembly 26 in FIG. 14 .
- the oil control valve 70 is open.
- the needle 106 is retracted.
- the check ball 104 opens only under oil pressure from the oil control valve 70.
- FIG. 16 shows the exhaust rocker arm 40 on the base circle of the cam shaft 54 and the engine brake rocker arm 60 rotated a distance counterclockwise from engaging a raised portion of the cam shaft 54.
- the engaging portion 62 of the engine brake rocker arm 60 is engaged with the engine brake capsule piston 80.
- the engine brake capsule 46 is expanded such that engine brake capsule body 82 touches the valve tip 83 on the valve bridge 42. Rigid transitioning of the engine brake rocker arm 60 motion to the exhaust valve 52 engine brake lift (opening) is shown.
- the schematic of FIG. 17 corresponds to the position of the dual exhaust valve rocker arm assembly 26 in FIG. 16 .
- the oil control valve 70 is open.
- the needle 106 is retracted.
- the check ball 104 is closed by pressure from the engine brake capsule 46.
- FIG. 18 shows the exhaust rocker arm 40 at maximum lift on cam shaft 54 and the engine brake rocker arm 60 on the base circle of the cam shaft 54.
- the exhaust rocker arm assembly 22 will control opening of both valves 50, 52.
- the engine brake rocker arm 60 will be kept in place against the cam shaft 54 by the lost motion spring 232.
- the schematic of FIG. 19 corresponds to the position of the dual exhaust valve rocker arm assembly 26 in FIG. 18 .
- the oil control valve 70 is open.
- the needle 106 is retracted.
- the check ball 104 opens only by pressure from the engine brake capsule 46.
- the engine brake capsule 46 will expand up to its hard stop for maximum extension.
- FIG. 20 shows the exhaust rocker arm 40 and the engine brake rocker arm 60 on the base circle of the cam shaft 54. Both exhaust valves 50, 52 will close contemporary controlled by the exhaust rocker arm assembly 22.
- the engine brake capsule 46 will be (again) fully expanded. Oil leaked out from the engine brake capsule 46 during the lift will be replenished.
- the schematic of FIG. 21 corresponds to the position of the dual exhaust valve rocker arm assembly 26 in FIG. 20 .
- the oil control valve 70 is open.
- the needle 106 is retracted.
- the check ball 104 opens only by pressure from the engine brake capsule 46.
- the engine brake capsule 46 will expand up to its hard stop for maximum extension.
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- Valve Device For Special Equipments (AREA)
Description
- This application claims the benefit of
U.S. Patent Application No. 62/001276 filed on May 21, 2014 - The present disclosure relates generally to a rocker arm assembly for use in a valve train assembly and more particularly to a rocker arm assembly that incorporates a dedicated rocker arm that acts on a single exhaust valve to perform an engine brake function.
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CN203097985U shows an engine braking device with special cam for braking single valve.WO2012078280A1 shows engine braking devices and methods.WO2012162616A1 shows a primary and auxiliary rocker arm assembly for engine valve actuation. - Compression engine brakes can be used as auxiliary brakes, in addition to wheel brakes, on relatively large vehicles, for example trucks, powered by heavy or medium duty diesel engines. A compression engine braking system is arranged, when activated, to provide an additional opening of an engine cylinder's exhaust valve when the piston in that cylinder is near a top-dead-center position of its compression stroke so that compressed air can be released through the exhaust valve. This causes the engine to function as a power consuming air compressor which slows the vehicle.
- In a typical valve train assembly used with a compression engine brake, the exhaust valve is actuated by a rocker arm which engages the exhaust valve by means of a valve bridge. The rocker arm rocks in response to a cam on a rotating cam shaft and presses down on the valve bridge which itself presses down on the exhaust valve to open it. A hydraulic lash adjuster may also be provided in the valve train assembly to remove any lash or gap that develops between the components in the valve train assembly.
- The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.
- The invention is defined according to the claims.
- A dual exhaust rocker arm assembly constructed in accordance to one example of the present disclosure is operable in a combustion engine mode and an engine braking mode. The dual exhaust valve rocker arm assembly selectively opens first and second exhaust valves and includes a rocker shaft, an exhaust valve rocker arm assembly, an engine brake rocker arm assembly and an engine brake capsule. The exhaust valve rocker arm assembly has an exhaust rocker arm that receives the rocker shaft and is configured to rotate around the rocker shaft. The exhaust rocker arm further defines a bore having an inner diameter. The engine brake rocker arm assembly has an engine brake rocker arm. The engine brake capsule is slidably received along the inner diameter of the bore of the exhaust valve rocker arm. The engine brake capsule is selectively translatable upon urging by the engine brake rocker arm. The engine brake capsule, in turn, urges one of the first and second exhaust valves open during engine braking mode.
- According to additional features the dual exhaust valve rocker arm assembly further comprises an oil control valve that provides oil flow for actuation of the engine brake capsule from a pressurized oil supply. The engine brake capsule includes an engine brake capsule piston and an engine brake capsule body. A pressurized oil chamber is defined between the engine brake capsule piston and the engine brake capsule body. The engine brake rocker arm is configured to act on the engine brake capsule piston which acts on the engine brake capsule body which ultimately acts on one of the engine brake exhaust valves.
- According to other features, the dual exhaust valve rocker arm assembly further comprises a valve tip positioned between one of the engine brake exhaust valves and the engine brake capsule body. A lock ball assembly can include a ball lock and a ball lock spring. The ball lock spring can urge the ball lock into a groove defined on the engine brake capsule body. A c-clip can be configured on the rocker arm assembly. The c-clip can limit a stroke of the engine brake capsule and provide a hard stop.
- According to still additional features, the dual exhaust rocker arm assembly further includes an actuator assembly configured to move the engine brake capsule between an extended and a retracted position. The actuator assembly and the oil control valve are configured in the exhaust rocker arm separate from the engine brake capsule. The actuator assembly includes an actuator body, an actuator check ball, an actuator needle, an actuator return spring and an actuator locking nut. The actuator needle is configured to keep the actuator check ball in an open position and prevent oil pressure buildup in the engine brake capsule. The actuator check ball allows one-way replenishment at every cycle into the pressurized oil chamber. In engine braking mode, the oil control valve is energized open and oil pressure causes the actuator needle to move away from a corresponding seat such that the engine brake capsule is extended a predetermined length. De-energizing the oil control valve causes the actuator needle to allow oil out from the pressurized oil chamber and the engine brake capsule to move to the retracted position allowing combustion. In additional features, the dual exhaust rocker arm assembly includes a first adjustment screw provided on the engine brake rocker arm and a second adjustment screw provided on the exhaust rocker arm. Both of the first and second adjustment screws are adjustable to selectively provide lash settings for the dual exhaust rocker arm assembly.
- The present disclosure will become more fully understood from the detailed description and the accompanying drawings, wherein:
-
FIG. 1 is a top view of a partial valve train assembly incorporating a rocker arm assembly including an intake rocker arm, an exhaust rocker arm and an engine brake rocker arm constructed in accordance to one example of the present disclosure; -
FIG. 2 is a side view of an exhaust rocker arm and an engine brake rocker arm of the valve train assembly ofFIG. 1 ; -
FIG. 3 is a schematic illustration of the exhaust rocker arm and the engine brake rocker arm ofFIG. 2 according to one example; -
FIG. 4 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 2 and shown with an engine brake capsule fully extended; -
FIG. 5 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 2 and shown with the engine brake on max lift; -
FIG. 6 is a detail cross-sectional view of a ball lock and ball spring that loads a ball against a groove defined in an outer diameter of a capsule body of the exhaust valve rocker arm assembly ofFIG. 2 according to one example; -
FIG. 7 is a side view of the ball engaging the groove on the outer diameter of the capsule body ofFIG. 6 ; -
FIG. 8 is a top perspective view of a first adjustment screw on the engine brake arm, a second adjustment screw of the exhaust arm and a third adjustment screw of the intake arm, all provided to provide valve lash set according to one example of the present disclosure; and -
FIG. 9 is a cross-sectional view of the exhaust rocker arm assembly ofFIG. 2 showing a stroke length of a fully collapsed and fully expanded engine brake capsule; -
FIG. 10 is a side view of the exhaust valve rocker arm assembly shown with the exhaust rocker arm and the engine brake rocker arm on the base circle of the cam shaft; -
FIG. 11 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 10 ; -
FIG. 12 is a side view of the exhaust valve rocker arm assembly shown with the exhaust rocker arm on maximum lift and the engine brake rocker arm on the base circle of the cam shaft; -
FIG. 13 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 12 ; -
FIG. 14 is a side view of the exhaust valve rocker arm assembly shown with the exhaust rocker arm and the engine brake rocker arm on the base circle of the cam shaft; -
FIG. 15 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 14 ; -
FIG. 16 is a side view of the exhaust valve rocker arm assembly shown with the exhaust rocker arm on the base circle and the engine brake rocker arm rotated a distance counterclockwise from engaging a raised portion of the cam shaft; -
FIG. 17 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 16 ; -
FIG. 18 is a side view of the exhaust valve rocker arm assembly shown with the exhaust rocker arm at maximum lift and the engine brake rocker arm on the base circle of the cam shaft; -
FIG. 19 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 18 ; -
FIG. 20 is a side view of the exhaust valve rocker arm assembly shown with the exhaust rocker arm and the engine brake rocker arm on the base circle of the cam shaft; and -
FIG. 21 is a schematic illustration of the exhaust valve rocker arm assembly ofFIG. 20 . - Heavy duty (HD) diesel engines with single overhead cam (SOHC) valvetrain requires high braking power, in particular at low engine speed. The present disclosure provides an added motion type De-Compression engine brake. To provide high braking power without applying high load on the rest of the valvetrain (particularly the camshaft), the present disclosure provides a dedicated rocker arm for engine brake that acts on one exhaust valve. In this regard, half of the input load is experienced compared to other configurations that have two exhaust valves opening.
- With initial reference to
FIG. 1 , a partial valve train assembly constructed in accordance to one example of the present disclosure is shown and generally identified atreference 10. The partialvalve train assembly 10 utilizes engine braking and is shown configured for use in a three-cylinder bank portion of a six-cylinder engine. It will be appreciated however that the present teachings are not so limited. In this regard, the present disclosure may be used in any valve train assembly that utilizes engine braking. The partialvalve train assembly 10 is supported in avalve train carrier 12 and can include three rocker arms per cylinder. - Specifically, each cylinder includes an intake valve
rocker arm assembly 20, an exhaust valverocker arm assembly 22 and an engine brakerocker arm assembly 24. The exhaust valverocker arm assembly 22 and the engine brakerocker arm assembly 24 cooperate to control opening of the exhaust valves and are collectively referred to as a dual exhaust valve rocker arm assembly 26 (FIG. 2 ). The intake valverocker arm assembly 20 is configured to control motion of the intake valves. The exhaust valverocker arm assembly 22 is configured to control exhaust valve motion in a drive mode. The engine brakerocker arm assembly 24 is configured to act on one of the two exhaust arms in an engine brake mode as will be described herein. Arocker shaft 34 is received by thevalve train carrier 12 and supports rotation of the exhaust valverocker arm assembly 22 and the engine brakerocker arm assembly 24. - With further reference now to
FIGS. 2 and3 , an exhaust valverocker arm assembly 22 will be further described. The exhaust valverocker arm assembly 22 can generally include anexhaust rocker arm 40, avalve bridge 42, aspigot spigot assembly 44 and anengine brake capsule 46. Thevalve bridge 42 engages a first andsecond exhaust valve 50 and 52 (FIG. 2 ) associated with a cylinder of an engine (not shown). Theexhaust rocker arm 40 rotates around therocker shaft 34 based on a lift profile of acam shaft 54. The engine brakerocker arm assembly 24 can include an enginebrake rocker arm 60 having an engagingportion 62. The enginebrake rocker arm 60 rotates around therocker shaft 34 based on a lift provide of thecam shaft 54. - With specific reference to
FIG. 3 , schematic function of the exhaust valverocker arm assembly 22 and the engine brakerocker arm assembly 24 will be described. The configuration includes anoil control valve 70 that providesoil flow 72 for actuation from apressurized oil supply 74.Pressurized oil chamber 78 is shown inside theengine brake capsule 46. Theengine brake capsule 46 can include an enginebrake capsule piston 80 and an enginebrake capsule body 82. Avalve tip pin 83 is positioned between theexhaust valve 52 and the enginebrake capsule body 82. A c-clip 84 can provide a hard stop for the enginebrake capsule body 82. An engine brake rocker arm schematic 90 represents the engine brakerocker arm assembly 24 rotating as a result of cam lobe breaking 92. - An
actuator assembly 100 includes anactuator body 102, anactuator check ball 104, anactuator needle 106, anactuator return spring 108 and anactuator locking nut 110. When the engine is in drive (combustion) mode, theoil control valve 70 is closed and the enginebrake capsule body 82 is completely retracted having no influence on theexhaust valves actuator needle 106 can keep thecheck ball 104 in an open position (away from corresponding seat 107) and prevent oil pressure buildup in theengine brake capsule 46. The motion of the engine brake rocker arm 60 (FIG. 2 ), or represented inFIG. 3 as the rocker arm schematic 90 will have no effect on the motion of theexhaust valve 52 when the engine is in drive mode. - When the engine is in brake (no combustion) mode, the
oil control valve 70 will be energized open and oil pressure will push back theactuator needle 106 and fill (extend) theengine brake capsule 46 for a predetermined length such as 4 mm. A gap between the engine brake rocker arm 60 (rocker arm schematic 90) and theexhaust valve 52 will be compensated so that motion of the enginebrake rocker arm 60 controlled by thecam lobe 92 will create additional lift on theexhaust valve 52. Theactuator check ball 104 will allow one-way oil replenishment at every cycle into thepressurized oil chamber 78. When de-energizing theoil control valve 70, theneedle 106 will allow oil out from the pressurizedoil chamber 78 and theengine brake capsule 46 will go back into a retracted position allowing driving mode (combustion) again. The engine brakerocker arm assembly 24 opens the exhaust valve 52 (positioned closer to the rocker shaft 34) providing favorable force ratio allowing higher braking power. Theexhaust valve 52 is opened later in a compression stroke (close to top dead center), still with acceptable load on the cam lobe. -
FIG. 4 illustrates theengine brake capsule 46 expanded or extended. The gap between the enginebrake capsule body 82 and thevalve tip pin 83 is eliminated.FIG. 5 illustrates the engine brake at maximum lift. Theexhaust rocker arm 40 is on the base circle while the enginebrake rocker arm 60 controls the lift of the enginebrake exhaust valve 52. Explained further, the enginebrake rocker arm 60 acts on the enginebrake capsule piston 80, which acts on the enginebrake capsule body 82, which acts on thevalve tip pin 83, which acts on the enginebrake exhaust valve 52. - With reference now to
FIGS. 6 and7 , additional features of the present disclosure will be described. A ball lock assembly 150 includes aball lock 152 and aball lock spring 154. Theball lock spring 154 urges (identified by force F,FIG. 7 ) theball lock 152 into agroove 160 defined on the outer diameter of the enginebrake capsule body 82. Thegroove 160 has adepth 170 and aradius 172 configured to assure the enginebrake capsule body 82 does not shake by its inertia, but rather under the load of the enginebrake rocker arm 60 in engine brake mode. The ball lock assembly 150 will have no impact on the enginebrake capsule piston 80 expansion or retraction time. A c-clip 180 is provided to limit the stroke of the enginebrake capsule body 82. In this regard, the c-clip 180 provides a hard stop important for transportation. - Turning now to
FIGS. 8 and9 , additional features will be described. Afirst adjustment screw 210 is provided on theengine brake arm 60. Asecond adjustment screw 212 is provided on theexhaust arm 40. Athird adjustment screw 214 is provided on theintake arm 20. Each of the first, second and third adjustment screws 210, 212 and 214 all provide valve lash settings according to one example of the present disclosure. To set the engine brake lash, theengine brake capsule 46 is pushed down (as viewed inFIG. 9 ) into the collapsed position (no oil) to zero the lash in theexhaust valve 52. From this position, thefirst adjustment screw 210 is re-winded for exhaust brake capsule stroke and lash on the same valve. In one example theengine brake capsule 46 is made such that the difference between a fully collapsed and fully expanded length is within a narrow tolerance 220 (such as plus or minus 0.05 mm). Each of the first, second and third adjustment screws 210, 212 and 214 can have a common thread and nut size so that a common tool can be used for adjustment. - The present configuration provides many benefits. For example, actuation of engine brake function is controlled by pressurized engine oil by two
oil control valves 70, one for each of the three cylinders (for the example shown inFIG. 1 ). Theoil control valves 70 can be configured to operate independently. Valve actuation components for three cylinders are incorporated in onevalvetrain carrier 12 ready to be assembled on a cylinder head. The configuration provides high performance engine braking without necessarily creating high load on valvetrain components by acting solely on oneexhaust valve 52. By using a dedicated rocker arm (engine brake rocker arm 60), for engine brake, favorable rocker and force ratio transmitting lower load on therocker shaft 34 andcamshaft 54. - Furthermore, the
engine brake capsule 46 is installed in and guided by an inner diameter 190 (FIG. 6 ) defined in theexhaust rocker arm 40. In this regard, while prior art configurations may provide a hydraulic capsule configured within the engine brake rocker arm, the present disclosure includes anengine brake capsule 46 configured in the exhaust rocker arm 40 (instead of in the engine brake rocker arm 60). The configuration provides favorable packaging advantages. Theengine brake capsule 46 is configured to move freely along theinner diameter 190 in theexhaust rocker arm 40 while being controlled by the enginebrake rocker arm 60. - The configuration of the present disclosure provides actuation control from the
actuator assembly 100 to move theengine brake capsule 46 between an extended and retracted position. Theactuator assembly 100 and the oil control valve 70 (FIG. 3 ) are configured in theexhaust rocker arm 40 and are separate from theengine brake capsule 46. Moreover, the ball lock assembly 150 provides drive mode retention of the enginebrake capsule body 82 in drive mode. - With reference now to
FIGS. 10-21 , an exemplary operating sequence of the dual exhaust valverocker arm assembly 26 will be described.FIG. 10 shows theexhaust rocker arm 40 and the enginebrake rocker arm 60 on the base circle of thecam shaft 54. The engagingportion 62 of the engine brake enginebrake rocker arm 60 is disengaged with the enginebrake capsule piston 80. Theengine brake capsule 46 is collapsed. The schematic ofFIG. 11 corresponds to the position of the dual exhaust valverocker arm assembly 26 inFIG. 10 . Theoil control valve 70 is closed draining open. Thecheck ball 104 is in an open position away from itsseat 107. -
FIGS. 12 and13 will now be described.FIG. 12 shows theexhaust rocker arm 40 on maximum lift of thecam shaft 54 and the enginebrake rocker arm 60 on the base circle of thecam shaft 54. The engagingportion 62 of the enginebrake rocker arm 60 is disengaged with the enginebrake capsule piston 80. An exhaust brake rocker arm lostmotion spring 232 keeps the enginebrake rocker arm 60 against thecamshaft 54. Theengine brake capsule 46 is collapsed. The schematic ofFIG. 13 corresponds to the position of the dual exhaust valverocker arm assembly 26 inFIG. 12 . Theoil control valve 70 is closed draining open. Thecheck ball 104 is in an open position away from itsseat 107. -
FIGS. 14 and15 will now be described.FIG. 14 shows theexhaust rocker arm 40 on the base circle of thecam shaft 54 and the enginebrake rocker arm 60 on the base circle of thecam shaft 54. The engagingportion 62 of the enginebrake rocker arm 60 is engaged with the enginebrake capsule piston 80. Theengine brake capsule 46 is expanded such that enginebrake capsule body 82 touches thevalve tip 83 on thevalve bridge 42. The schematic ofFIG. 15 corresponds to the position of the dual exhaust valverocker arm assembly 26 inFIG. 14 . Theoil control valve 70 is open. Theneedle 106 is retracted. Thecheck ball 104 opens only under oil pressure from theoil control valve 70. -
FIGS. 16 and17 will now be described.FIG. 16 shows theexhaust rocker arm 40 on the base circle of thecam shaft 54 and the enginebrake rocker arm 60 rotated a distance counterclockwise from engaging a raised portion of thecam shaft 54. The engagingportion 62 of the enginebrake rocker arm 60 is engaged with the enginebrake capsule piston 80. Theengine brake capsule 46 is expanded such that enginebrake capsule body 82 touches thevalve tip 83 on thevalve bridge 42. Rigid transitioning of the enginebrake rocker arm 60 motion to theexhaust valve 52 engine brake lift (opening) is shown. The schematic ofFIG. 17 corresponds to the position of the dual exhaust valverocker arm assembly 26 inFIG. 16 . Theoil control valve 70 is open. Theneedle 106 is retracted. Thecheck ball 104 is closed by pressure from theengine brake capsule 46. -
FIGS. 18 and19 will now be described.FIG. 18 shows theexhaust rocker arm 40 at maximum lift oncam shaft 54 and the enginebrake rocker arm 60 on the base circle of thecam shaft 54. Once passed the engine brake lift, the exhaustrocker arm assembly 22 will control opening of bothvalves brake rocker arm 60 will be kept in place against thecam shaft 54 by the lostmotion spring 232. The schematic ofFIG. 19 corresponds to the position of the dual exhaust valverocker arm assembly 26 inFIG. 18 . Theoil control valve 70 is open. Theneedle 106 is retracted. Thecheck ball 104 opens only by pressure from theengine brake capsule 46. Theengine brake capsule 46 will expand up to its hard stop for maximum extension. -
FIGS. 20 and21 will now be described.FIG. 20 shows theexhaust rocker arm 40 and the enginebrake rocker arm 60 on the base circle of thecam shaft 54. Bothexhaust valves rocker arm assembly 22. Theengine brake capsule 46 will be (again) fully expanded. Oil leaked out from theengine brake capsule 46 during the lift will be replenished. The schematic ofFIG. 21 corresponds to the position of the dual exhaust valverocker arm assembly 26 inFIG. 20 . Theoil control valve 70 is open. Theneedle 106 is retracted. Thecheck ball 104 opens only by pressure from theengine brake capsule 46. Theengine brake capsule 46 will expand up to its hard stop for maximum extension.
Claims (10)
- A dual exhaust valve rocker arm assembly (26) operable in a combustion engine mode and an engine braking mode, the dual exhaust valve rocker arm assembly (26) selectively opening first and second exhaust valves (50, 52) and comprising:a rocker shaft (34);an exhaust valve rocker arm assembly (22) having an exhaust rocker arm (40) that receives the rocker shaft (34) and is configured to rotate around the rocker shaft (34), the exhaust rocker arm further (40) defining a bore having an inner diameter (190);an engine brake rocker arm assembly (24) having an engine brake rocker arm (60); andan engine brake capsule (46) slidably received along the inner diameter (190) of the bore of the exhaust valve rocker arm (40), wherein the engine brake capsule (46) includes an engine brake capsule piston (80) and an engine brake capsule body (82), wherein a pressurized oil chamber (78) is defined between the engine brake capsule piston (80) and the engine brake capsule body (82), wherein the engine brake rocker arm (60) is configured to act on the engine brake capsule piston (80) which acts on the engine brake capsule body (82) which ultimately acts on one of the first and second exhaust valves (50, 52), and wherein the engine brake capsule (46) is selectively translatable upon urging by the engine brake rocker arm- (60), the engine brake capsule (46), in turn, urging one of the first and second exhaust valves (50, 52) open during engine braking mode;wherein the dual exhaust valve rocker arm assembly further comprises:
an oil control valve (70) that provides oil flow for actuation of the engine brake capsule (46) from a pressurized oil supply (74),characterized in that:the dual exhaust valve rocker arm assembly (26) comprises:
a lock ball assembly (150) including a ball lock (152) and a ball lock spring (154);wherein the ball lock spring (154) of the lock ball assembly (150) is configured to urge the ball lock (152) into a groove (160) defined on the engine brake capsule body (82) to provide retention of the engine brake capsule body (82) in the combustion mode;wherein, when the engine is in the combustion mode, the oil control valve (70) is closed and the engine brake capsule body (82) is completely retracted having no influence on the first and second exhaust valves (50, 52) motion and is retained by the lock ball assembly (150). - The dual exhaust valve rocker arm assembly of claim 1, further comprising a valve tip (83) positioned between one of the first and second exhaust valves (52) and the engine brake capsule body (82).
- The dual exhaust valve rocker arm assembly of claim 1, further comprising a c-clip (84) configured on the rocker arm assembly and that limits a stroke of the engine brake capsule (46) and provides a hard stop.
- The dual exhaust valve rocker arm assembly of claim 1, further comprising:
an actuator assembly configured to move the engine brake capsule (46) between an extended and a retracted position. - The dual exhaust valve rocker arm assembly of claim 4, wherein the actuator assembly (100) and the oil control valve (70) are configured in the exhaust rocker arm (40) separate from the engine brake capsule (46).
- The dual exhaust valve rocker arm assembly of claim 4, wherein the actuator assembly (100) includes an actuator body (102), an actuator check ball (140), an actuator needle (106), an actuator return spring (108) and an actuator locking nut (110), wherein the actuator needle (106) is configured to keep the actuator check ball (140) in an open position and prevent oil pressure build-up in the engine brake capsule (46).
- The dual exhaust valve rocker arm assembly of claim 6, wherein the actuator check ball allows (140) one-way replenishment at every cycle into the pressurized oil chamber (78).
- The dual exhaust valve rocker arm assembly of claim 6, wherein in engine braking mode, the oil control valve (70) is energized open and oil pressure causes the actuator needle (106) to move away from a corresponding seat (107) such that the engine brake capsule (46) is extended a predetermined length.
- The dual exhaust valve rocker arm assembly of claim 8, wherein de-energizing the oil control valve (70) causes the actuator needle (106) to allow oil out from the pressurized oil chamber (78) and the engine brake capsule (46) to move to the retracted position allowing combustion.
- The dual exhaust valve rocker arm assembly of claim 1, further comprising:a first adjustment screw provided (210) on the engine brake rocker arm (60); anda second adjustment screw (212) provided on the exhaust rocker arm (40); wherein both of the first and second adjustment screws (210, 212) are adjustably positioned to selectively provide lash settings for the dual exhaust rocker arm assembly.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201462001276P | 2014-05-21 | 2014-05-21 | |
PCT/EP2015/060967 WO2015177127A1 (en) | 2014-05-21 | 2015-05-19 | Heavy duty valvetrain with de-compression engine brake feature |
Publications (2)
Publication Number | Publication Date |
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EP3146185A1 EP3146185A1 (en) | 2017-03-29 |
EP3146185B1 true EP3146185B1 (en) | 2020-04-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15723509.4A Active EP3146185B1 (en) | 2014-05-21 | 2015-05-19 | Heavy duty valvetrain with de-compression engine brake feature |
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EP (1) | EP3146185B1 (en) |
JP (1) | JP6652556B2 (en) |
CN (1) | CN106536878B (en) |
WO (1) | WO2015177127A1 (en) |
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US10794242B2 (en) | 2016-03-14 | 2020-10-06 | Volvo Truck Corporation | Device for controlling at least one valve in an internal combustion engine |
AT518933B1 (en) | 2016-07-20 | 2018-07-15 | Avl List Gmbh | INTERNAL COMBUSTION ENGINE WITH A VALVE ACTUATING DEVICE |
US10539046B2 (en) | 2016-09-27 | 2020-01-21 | Cummins Inc. | Camshaft phaser/compression brake release integration with concentric camshaft |
EP4350130A3 (en) | 2017-08-14 | 2024-07-10 | Eaton Intelligent Power Limited | Integrated engine brake configuration |
US11549404B2 (en) | 2017-08-24 | 2023-01-10 | Eaton Intelligent Power Limited | Ball engine decompression mechanism |
DE112018003879T5 (en) | 2017-08-24 | 2020-04-16 | Eaton Intelligent Power Limited | BALL MOTOR BRAKE MECHANISM |
DE102017008963A1 (en) | 2017-09-26 | 2019-03-28 | Daimler Ag | Valve train device, in particular for an internal combustion engine |
CN110529216B (en) * | 2019-06-27 | 2024-04-19 | 浙江黎明智造股份有限公司 | Electric control type engine braking device |
EP4090837A1 (en) | 2020-01-15 | 2022-11-23 | Eaton Intelligent Power Limited | Lash setting features for castellation mechanism |
SE545489C2 (en) * | 2020-12-18 | 2023-09-26 | Gnutti Carlo Sweden Ab | Rocker arm valve mechanism |
CN112963220B (en) * | 2021-02-08 | 2022-08-02 | 广西玉柴机器股份有限公司 | Brake valve of integrated rocker arm brake mechanism and method for adjusting brake clearance |
DE102021000982A1 (en) * | 2021-02-24 | 2022-08-25 | Daimler Truck AG | Valve bridge for a valve drive of an internal combustion engine, in particular of a motor vehicle, valve drive for an internal combustion engine, in particular of a motor vehicle, and internal combustion engine |
WO2023151871A1 (en) * | 2022-02-10 | 2023-08-17 | Eaton Intelligent Power Limited | Integrated rocker for engine braking with hydraulic lash adjuster |
WO2023222254A1 (en) * | 2022-05-16 | 2023-11-23 | Eaton Intelligent Power Limited | Hydraulic capsule for hydraulic lash adjustment |
CN115949483B (en) * | 2023-03-10 | 2023-06-13 | 龙口中宇热管理***科技有限公司 | In-cylinder braking mechanism of engine and working method |
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JP3705029B2 (en) * | 1999-07-30 | 2005-10-12 | トヨタ自動車株式会社 | Valve timing control device for internal combustion engine |
KR100732445B1 (en) * | 2005-12-08 | 2007-06-27 | 현대자동차주식회사 | An intergated type engine brake for diesel engine |
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CN101392667B (en) * | 2008-10-30 | 2013-02-27 | 杨柳 | Engine braking apparatus and method using single valve and bridge of valve |
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CN102011622B (en) * | 2009-09-07 | 2013-05-01 | 上海尤顺汽车部件有限公司 | Improved engine brake driving device |
CN101994538B (en) * | 2009-08-10 | 2013-09-04 | 上海尤顺汽车部件有限公司 | Driving mechanism for engine brake |
WO2012078280A1 (en) * | 2010-11-05 | 2012-06-14 | Sonocine, Inc. | Elastography imaging system |
CN103597174B (en) * | 2011-05-26 | 2016-07-27 | 雅各布斯车辆***公司 | Secondary-rocker assembly of advocating peace for engine valve actuation |
CN203097985U (en) * | 2013-01-09 | 2013-07-31 | 上海尤顺汽车部件有限公司 | Engine braking device with special cam for braking single valve |
-
2015
- 2015-05-19 EP EP15723509.4A patent/EP3146185B1/en active Active
- 2015-05-19 WO PCT/EP2015/060967 patent/WO2015177127A1/en active Application Filing
- 2015-05-19 JP JP2017513326A patent/JP6652556B2/en not_active Expired - Fee Related
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CN106536878B (en) | 2019-05-31 |
JP6652556B2 (en) | 2020-02-26 |
CN106536878A (en) | 2017-03-22 |
WO2015177127A1 (en) | 2015-11-26 |
EP3146185A1 (en) | 2017-03-29 |
JP2017519157A (en) | 2017-07-13 |
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