A multiple cylinder engine includes a plurality of cylinders. Each cylinder includes a valve configured to open and close a port associated with each of the respective cylinders. The cylinders comprises at least a first cylinder group and a second cylinder group. A drive shaft is configured to rota
A multiple cylinder engine includes a plurality of cylinders. Each cylinder includes a valve configured to open and close a port associated with each of the respective cylinders. The cylinders comprises at least a first cylinder group and a second cylinder group. A drive shaft is configured to rotate about an axis. A plurality of valve actuators are configured to transmit rotational movement of the drive shaft to the valve. A change mechanism comprises a control member that is configured to change a transmission state of the rotational movement transmitted from the drive shaft to the valve actuators. The change mechanism is configured to sequentially change an open period and a lift amount of each valve by changing a control amount of the control member. The control member is common to the first and second cylinder groups and the transmission states for the first cylinder group differs from the transmission states of the second cylinder group in accordance with the control amount of the control member. The valve open period and the lift amount of the valves in the first cylinder group is capable of being set to zero in a predetermined operational range to suspend operation of the first cylinder group.
대표청구항▼
What is claimed is: 1. A multiple cylinder engine comprising: plurality of cylinders, each cylinder including a valve configured to open and close a port associated with each of the respective cylinders, the cylinders comprising at least a first cylinder group and a second cylinder group; a drive s
What is claimed is: 1. A multiple cylinder engine comprising: plurality of cylinders, each cylinder including a valve configured to open and close a port associated with each of the respective cylinders, the cylinders comprising at least a first cylinder group and a second cylinder group; a drive shaft configured to rotate about an axis; a plurality of valve actuators configured to transmit rotational movement of the drive shaft to the valves; a change mechanism comprising a control member that is configured to change a transmission state of the rotational movement transmitted from the drive shaft to the valve actuators, the change mechanism configured to sequentially change an open period and a largest lift amount of each valve by changing a control amount of the control member; wherein the control member is common to the first and second cylinder groups and wherein the transmission states for the first cylinder group differ from the transmission states of the second cylinder group in accordance with the control amount of the control member, and the valve open period and the largest lift amount of the valves in the first cylinder group is capable of being set to zero in a predetermined operational range to suspend operation of the first cylinder group; wherein the drive shaft includes a camshaft driven by a crankshaft; the valve actuator includes a rocker arm supported for swing movement; the change mechanism includes a swing cam supported for swing movement to follow the camshaft, and a control arm positioned between the swing cam and the camshaft or the rocker arm and supported by the control member for swing movement, the control amount of the control member is varied to change a relative relationship between a position of control arm and a position of the camshaft or a position of swing cam so as to sequentially change the open period and the largest lift amount of the valve; and wherein a cam surface of the swing cam has a shape which differs between the first and second cylinder groups, the cam surface of the swing cam for the first cylinder group is configured to bring a valve lift amount to zero when the control amount of the control member is in the predetermined range. 2. The multiple cylinder engine according to claim 1, wherein the control arm is positioned between the cam surface of the swing cam and the rocker arm, a relative relationship between a position of the control arm and a position of the cam surface is changed when a rotational angle of the control member is changed; thereby, the open period and the largest lift amount of said each valve is sequentially controllable. 3. The multiple cylinder engine according to claim 2, wherein the cam surface of the swing cam includes a base circle section and a lift section, the base circle section includes a circular arc which center is consistent with a center of the swing movement of the swing cam and makes the valve lift amount zero irrespective of a swing angle of the swing cam, the lift section increases the valve lift amount with the swing angle increasing, and the base circle section of the swing cam for first cylinder group has an angular range greater than the base circle section of the swing cam for the second cylinder group. 4. The multiple cylinder engine according to claim 3, wherein the lift section of the swing cam for the first cylinder group has a shape which becomes more similar to a shape of the lift section of the swing cam for the second cylinder group as the lift section of the swing cam for first cylinder group is spaced apart from a border thereof with the base circle towards the lift section. 5. A multiple cylinder engine comprising: a plurality of cylinders, each cylinder including a valve configured to open and close a port associated with each of the respective cylinders, the cylinders comprising at least a first cylinder group and a second cylinder group; a drive shaft configured to rotate about an axis; a plurality of valve actuators configured to transmit rotational movement of the drive shaft to the valves; a change mechanism comprising a control member that is configured to change a transmission state of the rotational movement transmitted from the drive shaft to the valve actuators, the change mechanism configured to sequentially change an open period and a largest lift amount of each valve by changing a control amount of the control member; wherein the control member is common to the first and second cylinder groups and wherein the transmission states for the first cylinder group differ from the transmission states of the second cylinder group in accordance with the control amount of the control member, and the valve open period and the largest lift amount of the valves in the first cylinder group is capable of being set to zero in a predetermined operational range to suspend operation of the first cylinder group; wherein the drive shaft includes a camshaft driven by a crankshaft; the valve actuator includes a rocker arm supported for swing movement; the change mechanism includes a swing cam supported for swing movement to follow the camshaft, a control arm positioned between the swing cam and the camshaft or the rocker arm and supported by the control member for swing movement, the control amount of the control member is varied to change a relative relationship between a position of the control arm and a position of the camshaft or a position of the swing cam so as to sequentially change the open period and the largest lift amount of the valve; a relative relationship between a position of the control arm and a position of the camshaft or a position of the swing cam differs from each other between the first and second cylinder group, the relative relationship for the first cylinder group is configured to bring a valve lift amount to zero when the control amount of the control member is in the predetermined range. 6. The multiple cylinder engine according to claim 5, wherein the control arm is coupled with the control member at a position which is out of a pivot center of the control member, a deviation amount of the control arm for the first cylinder group from the center of the control member is larger than a deviation amount of the control arm for the second cylinder group from the center of the control member, a contact portion at which the control arm for the first cylinder group contacts with a cam surface retreats toward a base circle section of the cam surface more than a contact portion at which the control arm for the second cylinder group contacts with an associated cam surface when the control member is in a predetermined angle range. 7. The multiple cylinder engine according to claim 6, wherein the control arm for the first cylinder group is shorter than the control arm for the second cylinder group, as the control member leaves from the predetermined angle range further, the contact portion of the control arm for the first cylinder group with the cam surface and the contact portion of the control arm for the second cylinder group with the cam surface approach closer to each other. 8. A multiple cylinder engine comprising: a plurality valves comprising a first group of valves and a second group of valves; a drive shaft configured to rotate about an axis; a plurality of valve actuators configured to transmit rotational movement of the drive shaft to the plurality of valves; a plurality change mechanisms configured to change an open period or a largest lift amount of each of the valves by changing a control amount of a control member that is common to the plurality of change mechanisms, the control member configured to change a state of the rotational movement transmitted from the drive shaft to the valve actuators by changing the control amount of the control member; wherein as the control amount of the control member is changed, the transmission states for the first group of valves differ from the transmission states for the second group of valves, wherein: the drive shaft includes a camshaft driven by a crankshaft; the valve actuator includes a rocker arm supported for swing movement; each of the plurality of change mechanisms includes a swing cam supported for swing movement to follow the camshaft, and a control arm positioned between the swing cam and the camshaft or the rocker arm and, the control arm is supported by the control member for swing movement, the control amount of the control member is varied to change a relative relationship between a position of control arm and a position of the camshaft or a position of the swing cam so as to sequentially change the open period and the largest lift amount of the valve. 9. The multiple valve engine of claim 8, wherein a cam surface of the swing cam for the change mechanism of the first group of valves has a shape which differs from a shape of a cam surface of the swing cam for the change mechanism of the second group of valves. 10. The multiple valve engine of claim 8, wherein the control arm is coupled to the control member at a position which is out of a pivot center of the control member, a deviation amount of the control arms for the change mechanism associated with the first group of valves being different than a deviation amount of the control arms for the change mechanism associated with the second group of valves.
Kuhn Peter (Prankolstrasse 61 D-6940 Weinheim DEX) Kachel Gerhard (Weltzienstsse 7 D-7500 Karlsruhe DEX) Schon Helmut (Rheingoldstrasse 2 D-7500 Karlsruhe DEX), Device for actuating the valves in internal combustion engines by means of revolving cams.
Shindou, Shigeki; Sakuragi, Shigeru; Toriumi, Masaki; Tomogane, Kazuto, Hydraulic pressure control system for cylinder cutoff device of internal combustion engine.
Schleusener, Michael; Flierl, Rudolf, Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine.
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