Actuator arrangement
An actuator arrangement for controlling a first latching arrangement of a first dual body rocker arm for controlling an intake valve of an internal combustion engine, and for controlling a second latching arrangement of a second dual body rocker arm for controlling an exhaust valve of the internal combustion engine, the first and second dual body rocker arms each including a first body, a second body, and the latching arrangement controllable to latch and unlatch the first body and the second body. The actuator arrangement includes: an actuation source; and an actuation transmission arrangement for transmitting movement of the actuation source to both the first latching arrangement and the second latching arrangement. In use, movement of the actuation source causes, via the actuation transmission arrangement, control of the first latching arrangement and of the second latching arrangement in common.
1. An actuator arrangement for controlling a first latching arrangement of a first dual body rocker arm for controlling an intake valve of an internal combustion engine, and for controlling a second latching arrangement of a second dual body rocker arm for controlling an exhaust valve of the internal combustion engine, the first and second dual body rocker arms each comprising a first body, a second body, and the respective first or second latching arrangement controllable to latch and unlatch the first body and the second body, the actuator arrangement comprising:
an actuation source; and
an actuation transmission arrangement configured to transmit movement of the actuation source to both the first latching arrangement and the second latching arrangement,
wherein, in use, movement of the actuation source is configured to cause, via the actuation transmission arrangement, control of the first latching arrangement and of the second latching arrangement in common,
wherein the actuation transmission arrangement comprises:
a first shaft comprising at least one first cam configured to control the first latching arrangement; and
a second shaft comprising at least one second cam configured to control the second latching arrangement,
wherein the actuation source is common to the first shaft and the second shaft, and
wherein, in use, a rotation of the actuation source is configured to cause the first shaft and the second shaft to rotate, thereby to change an orientation of the at least one first cam and the at least one second cam relative to the first latching arrangement and the second latching arrangement respectively, so as to control the first latching arrangement and the second latching arrangement in common.
2. The actuator arrangement according to claim 1 , wherein the internal combustion engine comprises a plurality of the first dual body rocker arm and a plurality of the second dual body rocker arm, and
wherein the actuation transmission arrangement is configured to transmit movement of the actuation source to each first latching arrangement of the plurality of the first dual body rocker arm and to each second latching arrangement of the plurality of the second dual body rocker arm.
3. The actuator arrangement according to claim 1 , wherein an axis of the rotation of the actuation source is perpendicular to an axis of rotation of the first shaft and the second shaft.
4. The actuator arrangement according to claim 1 , wherein the actuation transmission arrangement comprises a gear mechanism configured to translate a continuous rotation of the actuation source into an intermittent rotation of the first shaft and the second shaft in common in steps of a predefined degree.
5. The actuator arrangement according to claim 1 , wherein the at least one first cam comprises a plurality of first cams and the at least one second cam comprises a plurality of second cams, each of the plurality of first cams being configured to control a respective first latching arrangement of a respective first dual body rocker arm, and each of the plurality of second cams being configured to control a respective second latching arrangement of a respective second dual body rocker arm, and
wherein the plurality of first cams and the plurality of second cams each have a different shape so as to allow control on a per rocker arm basis.
6. The actuator arrangement according to claim 1 , wherein the actuation source comprises an electric motor.
7. A valve train assembly, comprising:
the actuator arrangement according to claim 1 ;
the intake valve and the exhaust valve; and
the first and second dual body rocker arms.
8. The valve train assembly according to claim 7 , wherein the intake valve and the exhaust valve are of a common cylinder of the internal combustion engine.
9. The valve train assembly according to claim 7 , wherein the valve train assembly comprises a plurality of the first dual body rocker arm and a plurality of the second dual body rocker arm,
wherein each of the plurality of the first dual body rocker arm is configured to control a respective intake valve of a respective cylinder of the internal combustion engine,
wherein each of the plurality of the second dual body rocker arm is configured to control a respective exhaust valve of the respective cylinder of the internal combustion engine, and
wherein the actuation transmission arrangement is configured to transmit movement of the actuation source to the respective first or second latching arrangement of each of the plurality of the first dual body rocker arm and each of the plurality of the second dual body rocker arm.
10. The valve train assembly according to claim 7 , wherein each of the plurality of first and second dual body rocker arms is configured to provide for cylinder deactivation.