Technical field of the invention
[0001] The present invention relates to a valve actuator arrangement for an internal combustion
engine, as defined in the preamble of claim 1.
Background of the invention
[0002] Gas exchange valves of internal combustion engines are most often operated by rotating
camshafts, but also hydraulically operated systems are known. Hydraulic valve opening
systems are used especially in large internal combustion engines, where they can provide
the benefits of variable gas exchange valve opening and closing times. In addition,
the components of a hydraulic system can be positioned more freely. However, the reliability
of hydraulic systems is not as good as with the mechanical valve actuators. The benefits
of both hydraulic and mechanical systems can be combined by using valve actuators,
which utilize both hydraulic and mechanical components. For instance, a camshaft can
be used for driving a piston, which pressurizes hydraulic fluid for opening gas exchange
valves. See e.g.
WO 99/25970.
Summary of the invention
[0003] The object of the present invention is to provide an improved valve actuator arrangement
for an internal combustion engine. The characterizing features of the arrangement
according to the invention are given in the characterizing part of claim 1.
[0004] A valve actuator arrangement according to the invention is arranged to open gas exchange
valves of an engine and comprises a pressurizing chamber, a cam-driven piston device,
which piston device protrudes into the pressurizing chamber dividing the pressurizing
chamber into at least a first section and a second section and comprises a first piston
surface for pressurizing hydraulic fluid in the first section of the pressurizing
chamber and a second piston surface for pressurizing hydraulic fluid in the second
section of the pressurizing chamber, a first hydraulic duct for introducing hydraulic
fluid from the first section of the pressurizing chamber to a first receiving chamber
for moving a piston that is connected to a first gas exchange valve, and a second
hydraulic duct for introducing hydraulic fluid from the second section of the pressurizing
chamber to a second receiving chamber for moving a piston that is connected to a second
gas exchange valve. The piston device is used for driving at least one additional
valve other than a gas exchange valve.
[0005] The valve actuator arrangement combines the reliability of a mechanical actuator
system and the adaptability of a hydraulic actuator system. The piston device comprising
several piston surfaces divides the flow of the hydraulic fluid equally to the gas
exchange valves. Since the same piston device is used for driving also other than
gas exchange valves, a compact valve actuator arrangement having several functions
is achieved.
[0006] The additional valves can be, for instance, gas injection valves, which are used
for supplying gaseous fuel to the engine. The engine can comprise a main gas injection
valve, which injects fuel into the intake duct, and another gas injection valve, which
injects fuel into a pre-chamber.
[0007] According to an embodiment of the invention, the piston device divides the pressurizing
chamber into an additional third section and comprises a third piston surface for
pressurizing hydraulic fluid in the third section of the pressurizing chamber for
opening an additional valve. In this embodiment, the piston device is arranged to
directly drive an additional valve.
[0008] According to another embodiment of the invention, the arrangement comprises a control
valve for releasing pressure from a third hydraulic duct, which is arranged between
an additional valve and the third section of the pressurizing chamber. With the control
valve, the opening and closing timing of the additional valve can be adjusted.
[0009] According to another embodiment of the invention, the piston device divides the pressurizing
chamber into an additional fourth section and comprises a fourth piston surface for
pressurizing hydraulic fluid in the fourth section of the pressurizing chamber for
opening an additional valve. According to another embodiment of the invention, the
arrangement comprises a control valve for releasing pressure from a fourth hydraulic
duct, which is arranged between an additional valve and the fourth section of the
pressurizing chamber. This embodiment is useful in engines comprising for example
a pre-chamber gas injection valve and a main gas injection valve, since both valves
can be provided with own piston surfaces and control valves.
[0010] According to an embodiment of the invention, the hydraulic duct between the additional
valve and the pressurizing chamber is provided with a pressure accumulator. According
to another embodiment of the invention, a valve is arranged between the pressure accumulator
and the additional valve for selectively introducing hydraulic fluid from the pressure
accumulator to the additional valve and for releasing hydraulic fluid from the additional
valve. With the pressure accumulator, part of the energy produced by the piston device
can be stored, and the opening and closing of the additional valves can be controlled
by valves.
[0011] According to another embodiment of the invention, a piston that is connected to a
gas exchange valve is provided with an additional piston surface facing the opening
direction of the gas exchange valve and pressurizing hydraulic fluid for opening an
additional valve when the gas exchange valve is opened. In this embodiment, the piston
device does not drive the additional valves directly, but the pistons connected to
the gas exchange valves are used as pumps.
Brief description of the drawings
[0012]
Fig. 1 shows a valve actuator arrangement according to a first embodiment of the invention.
Fig. 2 shows a valve actuator arrangement according to a second embodiment of the
invention.
Fig. 3 shows a valve actuator arrangement according to a third embodiment of the invention.
Fig. 4 shows a valve actuator arrangement according to a fourth embodiment of the
invention.
Fig. 5 shows a valve actuator arrangement according to a fifth embodiment of the invention.
Fig. 6 shows a valve actuator arrangement according to a sixth embodiment of the invention.
Fig. 7 shows a valve actuator arrangement according to a seventh embodiment of the
invention.
Fig. 8 shows a valve actuator arrangement according to an eighth embodiment of the
invention.
Detailed description of the invention
[0013] Embodiments of the invention are now described in more detail with reference to the
accompanying drawings.
[0014] The valve actuator arrangement according to the invention is used for opening gas
exchange valves 1, 1' of an internal combustion engine. The invention is suitable
especially for large internal combustion engines, such as main or auxiliary engines
of ships or engines that are used at power plants for producing electricity. The valve
actuator arrangement comprises a pressurizing chamber 4, in which hydraulic fluid
is pressurized by a cam-driven piston device 3 and supplied to the gas exchange valves
1, 1' for opening the valves 1, 1'. In the embodiment of the figures, the gas exchange
valves 1, 1' are intake valves, but they could also be exhaust valves. Each of the
gas exchange valves 1, 1' comprises a valve stem 1a and a valve disc 1b, which cooperates
with a valve seat 19 opening and closing flow communication between the cylinder and
the gas exchange duct. In the embodiment of the figures, conventional springs 20 are
used for closing the gas exchange valves 1, 1', but also air springs could be used.
The piston device 3 is connected to a cam follower unit 18, which comprises a cam
follower wheel 18a. The cam follower wheel 18a follows the surface of a rotating cam
17, and when the cam follower wheel 18a becomes engaged with the lobe 17a of the cam
17, the piston device 3 is pushed away from the rotation axis of the cam 17 and protrudes
into the pressurizing chamber 3. The piston device 3 divides the pressurizing chamber
4 into two or more sections 4a, 4b, 4c, 4d. A first section 4a of the pressurizing
chamber 4 is used for pressurizing hydraulic fluid for opening a first gas exchange
valve 1, and a second section 4b of the pressurizing chamber 4 is used for pressurizing
hydraulic fluid for opening a second gas exchange valve 1'. The piston device 3 comprises
a first piston surface 3a for pressurizing hydraulic fluid in the first section 4a
of the pressurizing chamber 4 and a second piston surface 3b for pressurizing hydraulic
fluid in the second section 4b of the pressurizing chamber 4. Because of the separate
piston surfaces 4a, 4b for the first and the second gas exchange valve 1, 1', the
hydraulic fluid is divided equally between the two gas exchange valves 1, 1'. Each
of the gas exchange valves 1, 1' is provided with a piston 1c for moving the gas exchange
valve 1, 1' in the opening direction of the gas exchange valve 1, 1'. In the embodiment
of figure 1, the piston 1c is arranged around the valve stem 1a. The piston 1c of
the first gas exchange valve 1 can reciprocate inside a first receiving chamber 7,
and the piston 1c of the second gas exchange valve 1' can reciprocate inside a second
receiving chamber 8. A first hydraulic duct 5 connects the first receiving chamber
7 to the first section 4a of the pressurizing chamber 4, and a second hydraulic duct
6 connects the second receiving chamber 8 to the second section 4b of the pressurizing
chamber 4. When the gas exchange valve 1, 1' is closed, the hydraulic fluid returns
via the hydraulic ducts 5, 6 into the pressurizing chamber 4.
[0015] In the embodiment of figure 1, the piston device 3 divides the pressurizing chamber
4 into an additional third section 4c and a fourth section 4d. The piston device 3
comprises a third piston surface 3c for pressurizing hydraulic fluid in the third
section 4c of the pressurizing chamber 4 and a fourth piston surface 3d for pressurizing
hydraulic fluid in the fourth section 4d of the pressurizing chamber 4. Through a
third hydraulic duct 12, pressurized hydraulic fluid can be supplied to a first additional
valve 9, which is in the embodiment of figure 1 a gas injection valve. The gas injection
valve 9 is used for supplying gaseous fuel into a pre-chamber 31. Through a fourth
hydraulic duct 13, pressurized hydraulic fluid can be supplied from the fourth section
4d of the pressurizing chamber 4 to a second additional valve 10, which is in the
embodiment of figure 1 a main gas injection valve 10, which can be used for supplying
gaseous fuel into the intake duct 11 of the engine. Both gas injection valves 9, 10
are provided with a valve spring 9a, 10a, which closes the valve 9, 10 when pressure
is relieved from the valve 9, 10. When the gas injection valves 9, 10 are closed,
the hydraulic fluid returns via the hydraulic ducts 12, 13 back into the pressurizing
chamber 4. Since the same piston device 3 is used for operating both the intake valves
1, 1' and the additional valves 9, 10, which are not gas exchange valves, the same
compact arrangement includes several functions. For compensating leakages from the
system, the arrangement is provided with an inlet duct 21 for supplying hydraulic
fluid into the pressurizing chamber 4. Each of the sections 4a, 4b, 4c, 4d of the
pressurizing chamber 4 is provided with an own branch of the inlet duct 21 and with
a check valve 22 for preventing flow from the pressurizing chamber 4 into the inlet
duct 21.
[0016] The embodiment of figure 2 is similar to the embodiment of figure 1, and therefore
only the differences between the embodiments are described. The difference between
the two embodiments is that in figure 2, each of the third hydraulic duct 12 and the
fourth hydraulic duct 13 is provided with a branch 12a, 13a. The branch 12a, 13a is
provided with a control valve 14, 14', which has an open position and a closed position.
The control valve 14, 14' can be, for instance, a solenoid valve. When the control
valve 14, 14' is closed, the arrangement works in the same manner as in the embodiment
of figure 1. When the control valve 14 is open, pressure building in the hydraulic
duct 12, 13 is prevented, or if the hydraulic fluid in the duct 12, 13 is pressurized,
the pressure is relieved. By opening the control valve 14, 14', the gas injection
valve 9, 10 can thus be closed before the cam follower wheel 18a leaves the lobe 17a
of the cam 17. If the control valve 14, 14' is kept open when the cam follower wheel
18a enters the lobe 17a of the cam 17 and the movement of the piston device 3 begins,
the opening of the gas injection valves 9, 10 can be delayed. The gas injection valves
9, 10 do not start opening until the valve 14, 14' is closed.
[0017] Also the embodiment of figure 3 is similar to the embodiment of figure 1. The opening
of the main gas injection valve 10 that is located in the intake duct 11 works in
the same manner as in the embodiment of figure 1. The third hydraulic duct 12 is provided
with a branch 12a, and a pressure accumulator 15 is arranged at the end of the branch
12a. There is also a check valve 23 in the third hydraulic duct 12 between the pressurizing
chamber 4 and the branch 12a. The hydraulic duct 12 is further provided with a three-way
valve 24, which is arranged downstream from the pressure accumulator 15. In a first
position of the three-way valve 24, flow from the pressure accumulator 15 to the gas
injection valve 9 is allowed. In a second position of the three-way valve 24, flow
from the gas injection valve 9 into a tank is allowed. With the three-way valve 24,
both the opening and closing timing of the gas injection valve 9 can be adjusted.
An additional difference to the other embodiments is that the arrangement comprises
means 25, 26 for variable intake closing (VIC). Between the cam follower unit 18 and
the piston device 3 there is a chamber 25 and a piston 26. By introducing hydraulic
fluid into the chamber 25, the return stroke of the piston device 3 and the closing
of the gas exchange valves 1, 1' can be delayed.
[0018] The embodiment of figure 4 is similar to the embodiment of figure 3. In this embodiment,
the piston device 3 is provided with only three piston surfaces 3a, 3b, 3c. The third
piston surface 3c is used for operating two gas injection valves 9, 10. The fourth
hydraulic duct 13 is branched from the third hydraulic duct 12. Also in this embodiment,
the second hydraulic duct 12 is provided with a branch 12a and a pressure accumulator
15 is arranged at the end of the branch 12. Between the branch 12a and the pressurizing
chamber 4 there is a check valve 23. The second hydraulic duct 12 is provided with
three-way valve 24, which works in the same manner as in the embodiment of figure
3. The fourth hydraulic duct 13 branches from the second hydraulic duct 12 upstream
from the three-way valve 24, i.e. between the pressure accumulator 15 and the three
way valve 24. Also the fourth hydraulic duct 13 is provided with a three-way valve
24', which works in the same manner as the valve 24 in the third hydraulic duct 12.
The opening and closing timings of both gas injection valves 9, 10 can thus be adjusted
in the same manner by switching between the two positions of the three-way valves
24, 24'.
[0019] The embodiment of figure 5 is similar to the embodiment of figure 3. The only differences
are that instead of being connected to the third hydraulic duct 12, the pressure accumulator
15 and the three-way valve 24 are connected to the fourth hydraulic duct 13, and the
arrangement is not provided with VIC. The three-way valve 24 is thus used for adjusting
the opening and closing timing of the gas injection valve 10 that is located in the
intake duct 11. The gas injection valve 9 of the pre-chamber 31 works in the same
manner as in the embodiment of figure 1.
[0020] In the embodiment of figure 6, the main gas injection valve 10 is controlled in the
same way as in the embodiment of figure 2, i.e. the fourth hydraulic duct 13 is provided
with a control valve 14, through which the pressure from the duct 13 can be relieved.
The third hydraulic duct 12 is provided with a branch 12a. The branch 12a is connected
to a chamber 27, which is provided with a spring-loaded piston 28. The piston 28 has
a limited moving range. The stiffness of the spring 29 is chosen so that when the
pressure in the third hydraulic duct 12 increases, the piston 28 in the chamber 29
moves over its full moving range before the gas injection valve 9 of the pre-chamber
31 opens. The opening of the gas exchange valve 9 is thus delayed compared to an arrangement
without the spring-loaded piston 28.
[0021] In the embodiment of figure 7, the piston device 3 is provided only with the first
piston surface 3a and the second piston surface 3b. Accordingly, the pressurizing
chamber 4 is divided into a first section 4a and a second section 4b. The gas exchange
valves 1, 1' are controlled in the same manner as in the other embodiments of the
invention. However, the piston 1c that is used for moving each gas exchange valve
1,1' has been arranged at the end of the valve stem 1a. The piston 1c is provided
with a second piston surface 16 that is facing the opening direction of the gas exchange
valve 1, 1'. The gas injection valves 9, 10 are operated by hydraulic fluid that is
pressurized by the second piston surfaces 16 of the pistons 1c that are in connection
with the gas exchange valve 1, 1'. The piston 1c divides the receiving chamber 7,
8 into an input section 7a, 8a and an output section 7b, 8b. The third hydraulic duct
12 and the fourth hydraulic duct 13 have been arranged between the gas injection valves
9, 10 and the output sections 7b, 8b of the receiving chambers 7, 8. An inlet duct
30 is connected to the output section 7b, 8b of each receiving chamber 7, 8 for compensating
leakages from the system. The inlet duct 30 is connected to the output section 8b
of the receiving chamber 8 of the second gas exchange valve 1' at such a height that
the opening of the gas injection valve 9 of the pre-chamber 31 does not start simultaneously
with the opening of the second gas exchange valve 1', but only after approximately
half of the full opening movement of the second gas exchange valve 1'. Until that,
the hydraulic fluid flows from the output section 8b of the receiving chamber 8 back
into the inlet duct 30.
[0022] In the embodiment of figure 8, the piston 1c of the second gas exchange valve 1'
is used for operating the gas injection valve 9 that is in the pre-chamber 31 in the
same manner as in the embodiment of figure 7. For operating the main gas injection
valve 10 in the intake duct 11, the piston device 3 is provided with a third piston
surface 3c. A third hydraulic duct 12 connecting a third section 4c of the pressurizing
chamber 4 to the gas injection valve 10 is provided with a branch 12a. A pressure
accumulator 15 is arranged at the end of the branch 12a. There is also a check valve
23 in the hydraulic duct 12 before the branch 12a, and a three-way valve 24 that is
arranged after the branch 12a. The control of the gas injection valve 10 in the intake
duct 11 works thus in the same manner as in the embodiment of figure 5. When the three-way
valve 24 allows flow from the pressure accumulator 15 to the gas injection valve 10,
the gas injection valve 10 is opened. When the hydraulic fluid is released via the
three-way valve 24 from the gas injection valve 24 into a tank, the gas injection
valve 10 is closed. The hydraulic fluid flowing past the piston 15a of the pressure
accumulator 15 is utilized by connecting the backside of the piston 15a to a duct
30 that is connected to the output section 8b of the receiving chamber 8 of the second
gas exchange valve 1' and works as the inlet duct 30, through which the leakages of
the system are compensated.
[0023] It will be appreciated by a person skilled in the art that the invention is not limited
to the embodiments described above, but may vary within the scope of the appended
claims. For instance, the features of the embodiments shown in different figures can
be combined in different ways. Each cylinder of the engine can be provided with several
pre-chambers, each of the pre-chambers having one or more gas injection valves, and
the actuator can be used for operating all the valves. Also, there can be more than
one gasinjection valve in the intake duct of each cylinder of the engine. If the number
of the valves is larger than in the embodiments of the figures, the number of the
sections in the pressurizing chamber can be increased accordingly.
1. A valve actuator arrangement for an internal combustion engine, which valve actuator
arrangement is arranged to open gas exchange valves (1, 1') of an engine and comprises
- a pressurizing chamber (4),
- a cam-driven piston device (3), which piston device (3) protrudes into the pressurizing
chamber (4) dividing the pressurizing chamber (4) into at least a first section (4a)
and a second section (4b) and comprises a first piston surface (3a) for pressurizing
hydraulic fluid in the first section (4a) of the pressurizing chamber (4) and a second
piston surface (3b) for pressurizing hydraulic fluid in the second section (4b) of
the pressurizing chamber (4),
- a first hydraulic duct (5) for introducing hydraulic fluid from the first section
(4a) of the pressurizing chamber (4) to a first receiving chamber (7) for moving a
piston (1c) that is connected to a first gas exchange valve (1), and
- a second hydraulic duct (6) for introducing hydraulic fluid from the second section
(4b) of the pressurizing chamber (4) to a second receiving chamber (8) for moving
a piston (1c) that is connected to a second gas exchange valve (1'),
characterized in that the piston device (3) is used for driving at least one additional valve (9, 10) other
than a gas exchange valve (1, 1').
2. An arrangement according to claim 1, characterized in that the additional valve is a gas injection valve (10) that is arranged to supply gaseous
fuel into the intake duct (11) of the engine.
3. An arrangement according to claim 1 or 2, characterized in that the additional valve is a gas injection valve (9) that is arranged to supply gaseous
fuel into a pre-chamber (31).
4. An arrangement according to any of claims 1-3, characterized in that the piston device (3) divides the pressurizing chamber (4) into an additional third
section (4c) and comprises a third piston surface (3c) for pressurizing hydraulic
fluid in the third section (4c) of the pressurizing chamber (4) for opening an additional
valve (9, 10).
5. An arrangement according to claim 4, characterized in that the arrangement comprises a control valve (14) for releasing pressure from a third
hydraulic duct (12), which is arranged between an additional valve (9, 10) and the
third section (4c) of the pressurizing chamber (4).
6. An arrangement according to claim 4 or 5, characterized in that the piston device (3) divides the pressurizing chamber (4) into an additional fourth
section (4d) and comprises a fourth piston surface (3d) for pressurizing hydraulic
fluid in the fourth section (4d) of the pressurizing chamber (4) for opening an additional
valve (9, 10).
7. An arrangement according to claim 6, characterized in that the arrangement comprises a control valve (14') for releasing pressure from a fourth
hydraulic duct (13), which is arranged between an additional valve (9, 10) and the
fourth section (4d) of the pressurizing chamber (4).
8. An arrangement according to any of claims 4-7, characterized in that the hydraulic duct (12, 13) between the additional valve (9, 10) and the pressurizing
chamber (4) is provided with a pressure accumulator (15).
9. An arrangement according to claim 8, characterized in that a valve (24, 24') is arranged between the pressure accumulator (15) and the additional
valve (9, 10) for selectively introducing hydraulic fluid from the pressure accumulator
(15) to the additional valve (9, 10) and for releasing hydraulic fluid from the additional
valve (9, 10).
10. An arrangement according to any of the preceding claims, characterized in that a piston (1c) that is connected to a gas exchange valve (1, 1') is provided with
an additional piston surface (16) facing the opening direction of the gas exchange
valve (1, 1') and pressurizing hydraulic fluid for opening an additional valve (9,
10) when the gas exchange valve (1, 1') is opened.
1. Ventil-Antriebsgruppe für einen Verbrennungsmotor, wobei die Ventil-Antriebsgruppe
zum Öffnen von Gasaustauschventilen (1, 1') eines Motors ausgelegt ist und Folgendes
umfasst:
- eine Druckbeaufschlagungskammer (4),
- eine nockenbetriebene Kolbenvorrichtung (3), wobei die Kolbenvorrichtung (3) in
die Druckbeaufschlagungskammer (4) vorragt, die die Druckbeaufschlagungskammer (4)
zumindest in einen ersten Abschnitt (4a) und einen zweiten Abschnitt (4b) teilt und
eine erste Kolbenfläche (3a) zum Vorspannen des hydraulischen Fluids im ersten Abschnitt
(4a) der Druckbeaufschlagungskammer (4) und eine zweite Kolbenfläche (3b) zum Vorspannen
des hydraulischen Fluids im zweiten Abschnitt (4b) der Druckbeaufschlagungskammer
(4) umfasst,
- einen ersten hydraulischen Kanal (5) zum Einleiten von hydraulischem Fluid aus dem
ersten Abschnitt (4a) der Druckbeaufschlagungskammer (4) in eine erste Aufnahmekammer
(7) zum Bewegen eines Kolbens (1c), der mit einem ersten Gasaustauschventil (1) verbunden
ist, und
- einen zweiten hydraulischen Kanal (6) zum Einleiten von hydraulischem Fluid aus
dem zweiten Abschnitt (4b) der Druckbeaufschlagungskammer (4) in eine zweite Aufnahmekammer
(8) zum Bewegen eines Kolbens (1c), der mit einem zweiten Gasaustauschventil (1')
verbunden ist, dadurch gekennzeichnet, dass die Kolbenvorrichtung (3) zum Ansteuern von mindestens einem zusätzlichen Ventil
(9, 10) verwendet wird, das nicht das Gasaustauschventil (1, 1') ist.
2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass das zusätzliche Ventil ein Gaseinspritzventil (10) ist, das zum Zuführen von gasförmigem
Brennstoff zum Aufnahmekanal (11) des Motors ausgelegt ist.
3. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das zusätzliche Ventil ein Gaseinspritzventil (9) ist, das zum Zuführen von gasförmigem
Brennstoff in eine Vorkammer (31) ausgelegt ist.
4. Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Kolbenvorrichtung (3) die Druckbeaufschlagungskammer (4) in einen zusätzlichen
dritten Abschnitt (4c) teilt und eine dritte Kolbenfläche (3c) zum Vorspannen von
hydraulischem Fluid im dritten Abschnitt (4c) der Druckbeaufschlagungskammer (4) zum
Öffnen eines zusätzlichen Ventils (9, 10) umfasst.
5. Anordnung nach Anspruch 4, dadurch gekennzeichnet, dass die Anordnung ein Steuerventil (14) zum Entlasten von Druck aus einem dritten hydraulischen
Kanal (12) umfasst, der zwischen einem zusätzlichen Ventil (9, 10) und dem dritten
Abschnitt (4c) der Druckbeaufschlagungskammer (4) angeordnet ist.
6. Anordnung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Kolbenvorrichtung (3) die Druckbeaufschlagungskammer (4) in einen zusätzlichen
vierten Abschnitt (4d) teilt und eine vierte Kolbenfläche (3d) zum Vorspannen von
hydraulischem Fluid im vierten Abschnitt (4d) der Druckbeaufschlagungskammer (4) zum
Öffnen eines zusätzlichen Ventils (9, 10) umfasst.
7. Anordnung nach Anspruch 6, dadurch gekennzeichnet, dass die Anordnung ein Steuerventil (14') zum Entlasten von Druck aus einem vierten hydraulischen
Kanal (13) umfasst, der zwischen einem zusätzlichen Ventil (9, 10) und dem vierten
Abschnitt (4d) der Druckbeaufschlagungskammer (4) angeordnet ist.
8. Anordnung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass der hydraulische Kanal (12, 13) zwischen dem zusätzlichen Ventil (9, 10) und der
Druckbeaufschlagungskammer (4) mit einem Druckspeicher (15) versehen ist.
9. Anordnung nach Anspruch 8, dadurch gekennzeichnet, dass ein Ventil (24, 24') zwischen dem Druckspeicher (15) und dem zusätzlichen Ventil
(9, 10) zum selektiven Einleiten von hydraulischem Fluid aus dem Druckspeicher (15)
in das zusätzliche Ventil (9, 10) und zum Freilassen von hydraulischem Fluid aus dem
zusätzlichen Ventil (9, 10) ausgelegt ist.
10. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Kolben (1c), der mit einem Gasaustauschventil (1, 1') verbunden ist, mit einer
zusätzlichen Kolbenfläche (16) versehen ist, die der Öffnungsrichtung des Gasaustauschventils
(1, 1') zugewandt ist und das hydraulische Fluid zum Öffnen eines zusätzlichen Ventils
(9, 10) vorspannt, wenn das Gasaustauschventil (1, 1') geöffnet wird.
1. Dispositif d'actionneur de soupape pour un moteur à combustion interne, lequel dispositif
d'actionneur de soupape est agencé pour ouvrir des soupapes d'échange de gaz (1, 1')
d'un moteur et comprend :
- une chambre de pressurisation (4),
- un dispositif de piston entraîné par came (3), lequel dispositif de piston (3) dépasse
à l'intérieur de la chambre de pressurisation (4) divisant la chambre de pressurisation
(4) en au moins une première section (4a) et une seconde section (4b) et comprend
une première surface de piston (3a) pour pressuriser un fluide hydraulique dans la
première section (4a) de la chambre de pressurisation (4) et une seconde surface de
piston (3b) pour pressuriser un fluide hydraulique dans la seconde section (4b) de
la chambre de pressurisation (4),
- une première conduite hydraulique (5) pour introduire un fluide hydraulique à partir
de la première section (4a) de la chambre de pressurisation (4) dans une première
chambre de réception (7) pour déplacer un piston (1c) qui est raccordée à une première
soupape d'échange de gaz (1), et
- une seconde conduite hydraulique (6) pour introduire un fluide hydraulique à partir
de la seconde section (4b) de la chambre de pressurisation (4) dans une seconde chambre
de réception (8) pour déplacer un piston (1c) qui est raccordée à un seconde soupape
d'échange de gaz (1')
caractérisé en ce que le dispositif de piston (3) est utilisé pour entraîner au moins une soupape additionnelle
(9, 10) autre qu'une soupape d'échange de gaz (1, 1').
2. Dispositif selon la revendication 1, caractérisé en ce que la soupape additionnelle est une soupape d'injection de gaz (10) qui est agencée
afin d'alimenter un combustible gazeux dans la conduite d'admission (11) du moteur.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la soupape additionnelles est une soupape d'injection de gaz (9) qui est agencée
afin d'alimenter un combustible gazeux dans une pré-chambre (31).
4. Dispositif selon une quelconque des revendications 1-3, caractérisé en ce que le dispositif de piston (3) divise la chambre de pressurisation (4) en une troisième
section additionnelle (4c) et comprend une troisième surface de piston (3c) pour pressuriser
un fluide hydraulique dans la troisième section (4c) de la chambre de pressurisation
(4) pour ouvrir une soupape additionnelle (9, 10).
5. Dispositif selon la revendication 4, caractérisé en ce que le dispositif comprend une soupape de commande (14) pour détendre une pression provenant
d'une première conduite hydraulique (12), qui est agencé entre une soupape additionnelle
(9, 10) et la troisième section (4c) de la chambre de pressurisation (4).
6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que le dispositif de piston (3) divise la chambre de pressurisation (4) en une quatrième
section additionnelle (4d) et comprend une quatrième surface de piston (3d) pour pressuriser
un fluide hydraulique dans la quatrième section (4d) de la chambre de pressurisation
(4) pour ouvrir une soupape additionnelle (9, 10).
7. Dispositif selon la revendication 6, caractérisé en ce que le dispositif comprend une soupape de commande (14') pour détendre une pression provenant
d'une quatrième conduite hydraulique (13), qui est disposée entre une soupape additionnelle
(9, 10) et la quatrième section (4d) de la chambre de pressurisation (4).
8. Dispositif selon une quelconque des revendications 4-7, caractérisé en ce que la conduite hydraulique (12, 13) entre la soupape additionnelle (9, 10) et la chambre
de pressurisation (4) est pourvue d'un accumulateur de pression (15).
9. Dispositif selon la revendication 8, caractérisé en ce que une soupape (24, 24') est disposée entre l'accumulateur de pression (15) et la soupape
additionnelle (9, 10) pour introduire sélectivement un fluide hydraulique à partir
de l'accumulateur de pression (15) dans la soupape additionnelle (9, 10) et pour détendre
un fluide hydraulique provenant de la soupape additionnelle (9, 10).
10. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce que un piston (1c) qui est raccordé à une soupape d'échange de gaz (1, 1') est pourvu
d'une surface de piston additionnelle (16) faisant face à la direction d'ouverture
de la soupape d'échange de gaz (1, 1') et pressurisant un fluide hydraulique pour
ouvrir une soupape additionnelle (9, 10) quand la soupape d'échange de gaz (1, 1')
est ouverte.