Device for changing the timing of an internal-combustion engine
View Patent ↗A device ( 1 ) for changing the timing of an internal-combustion engine ( 2 ) is provided that has a camshaft adjuster ( 5 ), which is supported on a non-rotating bearing journal ( 6 ). A driving wheel ( 8 ) of the camshaft adjuster ( 5 ) is driven by a crank-shaft ( 3 ) via a first traction mechanism drive ( 7 ). The rotation of the driving wheel ( 8 ) is transferred via an actuator ( 10 ) to a driven part ( 9 ), which is arranged so that it can rotate relative to the driving wheel ( 8 ). Second and third traction mechanism drives ( 11, 12 ) create a drive connection between the driven part ( 9 ) and two camshafts ( 4, 4 a ).
1. A device ( 1 ) for changing the timing of an internal-combustion engine ( 2 ) comprising a camshaft adjuster ( 5 ) including
a driving wheel ( 8 ) driven by a crankshaft ( 3 ) and
a driven part ( 9 ) driving at least one camshaft ( 4 ),
the driven part is driven by the driving wheel ( 8 ) via a hydraulic actuator ( 10 ),
wherein the hydraulic actuator ( 10 ) is formed with at least one pair of hydraulic compression chambers ( 22 , 23 ) working against each other, and
wherein a phase position between the crankshaft ( 3 ) and the at least one camshaft ( 4 ) can be changed via the actuator ( 10 ),
either the driving wheel ( 8 ) or the driven part ( 9 ) surrounds a non-rotating bearing journal ( 6 ) and is supported directly on the non-rotating bearing journal ( 6 ), and
the bearing journal ( 6 ) is mounted on a crankcase ( 35 ) of the engine.
2. The device ( 1 ) according to claim 1 , wherein the driving wheel ( 8 ) or the driven part ( 9 ) is supported by a sliding bearing on the bearing journal ( 6 ).
3. The device ( 1 ) according to claim 1 , wherein the driving wheel ( 8 ) or the driven part ( 9 ) is supported by a roller bearing on the bearing journal ( 6 ).
4. The device ( 1 ) according to claim 1 , wherein the hydraulic actuator ( 10 ) is supplied with pressurized hydraulic medium via at least one pressurized hydraulic medium channel 36 , 37 , which is arranged within the bearing journal ( 6 ).
5. The device ( 1 ) according to claim 1 , wherein a control valve ( 51 ) is provided within the bearing journal ( 6 ) for supplying the hydraulic actuator ( 10 ) with pressurized hydraulic medium.
6. The device ( 1 ) according to claim 1 , wherein the hydraulic actuator ( 10 ) is supplied with pressurized hydraulic medium via two pressurized hydraulic medium channels 36 , 37 , which are arranged within the bearing journal ( 6 ), wherein each of the pressurized hydraulic medium channels 36 , 37 is connected to a respective one of the compression chambers ( 22 , 23 ) of the hydraulic actuator ( 10 ).
7. The device ( 1 ) according to claim 1 , wherein the bearing journal ( 6 ) is mounted on the crankcase ( 35 ) by a threaded connection.
8. The device ( 1 ) according to claim 1 , wherein the bearing journal ( 6 ) is mounted on the crankcase ( 35 ) with a non-positive fit.
9. The device ( 1 ) according to claim 1 , wherein the bearing journal ( 6 ) is provided with means for axial support of the driving wheel or the driven part supported on the journal.
10. A camshaft adjuster ( 5 ) for changing the timing of an internal-combustion engine ( 2 ) having two banks of cylinders arranged in a V shape, the internal-combustion engine ( 2 ) comprising a crankshaft ( 3 ), and an intake camshaft ( 4 ) for each cylinder bank, the camshaft adjuster ( 5 ) comprising:
a driving wheel ( 8 ) driven by the crankshaft ( 3 ) via a driving traction mechanism drive ( 7 );
a driven part ( 9 ) driving each camshaft ( 4 ) via respective driven traction mechanism drives ( 11 , 12 );
a non-rotating bearing journal ( 6 ) directly supporting either the driving wheel ( 8 ) or the driven part ( 9 ); and
a hydraulic actuator ( 10 ) arranged between the driving wheel ( 8 ) and the driven part ( 9 ) that transfers rotation of the driving wheel ( 8 ) to the driven part ( 9 ),
wherein the driven part ( 9 ) is driven by the driving wheel ( 8 ) via the hydraulic actuator ( 10 ), and
a phase position between the crankshaft ( 3 ) and the camshafts ( 4 ) can be changed via the actuator ( 10 ).