Classifications

• • 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
  • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
  • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
• • 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
  • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
• • 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
  • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
  • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
  • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
• • 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
  • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
  • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
  • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
  • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
  • F01L2001/34483—Phaser return springs

Definitions

• the invention relates to a camshaft adjuster for an internal combustion engine, according to the precharacterizing clause of Claim 1 .
• the invention relates to a camshaft adjuster, by means of which, in order to influence
• a relative angular position between a camshaft and a drive element which is driven by a crankshaft of the internal combustion engine, for example, via a drawing means can be changed in a targeted manner according to a control device.
• US 6,31 1 ,654 B1 has disclosed a camshaft adjuster in the vane cell design, in which a chain sprocket drives a housing of the camshaft adjuster, in which housing an output element which is configured as a rotor is screwed fixedly in terms of rotation to a camshaft via a central screw.
• Vanes which are assigned to the rotor are arranged in pressure chambers of the housing in such a way that, depending on the hydraulic loading of the pressure chambers, the rotor and therefore the camshaft can be adjusted in the direction "early" or “late” relative to the housing and the drive gear.
• the do- cument addresses the problem that a hydraulic pump for loading the pressure chambers is usually driven by a crankshaft, which has the consequence that the flow of the hydraulic medium is reduced, in some circumstances, at a low speed of the internal combustion engine. This can lead to undesirable adjustments of the camshaft adjuster.
• JP A 9 264 1 10 proposes to connect a torsion spring between a drive element and an output element.
• the torsion spring is supported in the hou- sing of the camshaft adjuster at one base point on the chain sprocket, while the other base point of the torsion spring is supported on the rotor.
• DE 40 32 586 A1 has disclosed a camshaft adjuster which is actuated via a control piston, in which a torsion spring arrangement which serves to transmit approximately a mean torque is arranged parallel to the adjusting chambers between a drive gear and a camshaft.
• This refinement is based on the finding that, for adjustment in different directions, torques have to be generated in the camshaft adjuster which have opposite directions, the magnitudes of which, however, are different in some circumstances for different directions, with the result that, for example as a result of the drive movement and/or the friction conditions, a mean moment for the torque requirements for different adjusting directions results which is not equal to zero.
• the document proposes to provide the mean moment by an energy accumulator which is configured as a torsion spring arrangement which is connected parallel to the adjusting chambers between the drive sprocket and the camshaft.
• the torsion spring arrangement is configured separately from the camshaft adjuster.
• the invention is based on the object of proposing a camshaft adjuster which is improved with regard to
• the invention is based first of all on the finding that it is disadvantageous in some circumstances to connect a spring element for influencing the moment conditions of the camshaft adjuster between a drive element and the camshaft itself.
• a connection of this type requires suitable measures for connecting the spring element to the camshaft, which measures can increase the manufacturing expenditure for the camshaft, the mass, the mass moment of inertia and/or the installation space of the camshaft.
• a spring element of this type cannot already be mounted during manufacture of the camshaft adjuster, but only when the camshaft adjuster is assembled with the camshaft.
• the invention is based on the finding that, for refinements in accordance with US 6,31 1 ,654 B1 , the spring element has to be mounted in the housing of the camshaft adjuster. This has the consequence that the spring element has to be secured, for example, for an open housing with exact positioning of the housing parts and at the same time guaranteeing the accessibility of the interior of the housing. Moreover, a torsion spring which is arranged in the housing is the reason for the problems which are addressed in US 6,31 1 ,654 B1 with regard to the risk of transfer of the hydraulic medium between individual pressure chambers via a receiving space for the spring element. According to the invention, the spring element acts between the housing and the output element.
• the spring element can be supported directly on the housing or the output element, or merely indirectly with components which are connected fixedly in terms of rotation to the housing or the output element being connected in between.
• the output element can have a protrusion which is, in particular, hollow-cylindrical and
• a spring base point is supported on a section element.
• the supporting element is connected fixedly in terms of rotation to the output element which is arranged in the housing.
• the output element can be of single-piece or multiple-piece configuration with the section element.
• One wall of the housing has a cut-out.
• the supporting element extends through this cut-out, with the result that forces which are ap- plied to the supporting element outside the housing can be transmitted through the cut-out to the output element.
• the cut-out of the wall of the housing is configured in such a way that a relative rotation is made possible between the housing and the supporting e- lement and therefore the output element.
• the supporting element can be configured separately from the spring element or integrally with the latter, it being possible for flexural elasticity to be provided primarily by the spring element, or jointly by the spring element and the supporting element by a connection of the respective rigidities one behind another.
• One particular semi-finished product for which the mechanical properties can be predefined in a simple structural manner, can be used if the supporting element is configured as a pin.
• the invention proposes, furthermore, that a seal is provided between the housing and the rotor in the surrounding region of the above- mentioned cut-out.
• the sealing action can be effected, for example,
• the spring element has at least one hook-shaped spring base point which can be hooked, for example, into a lug, a journal or a bracket.
• the disc 24 for the side limb 14 has a hollow-cylindrical protrusion 22 with a bore 38 which extends in the direction of the cylinder head and bears the chain sprocket 13 radially on the outside.
• the disc 24, the protrusion 22 and the chain sprocket 3 are of single-piece configuration for the exemplary embodiment which is shown.
• the base limb 12 is formed by a hollow-cylindrical outer casing of the housing 4, which has radially inwardly oriented projections for delimiting the pressure chambers 7 in the circumferential direction.
• the housing 4 therefore has discs 23, 24, which are configured separately from one another but are sealed with respect to one another, and the outer casing.
• a seal 19 is arranged between the side limbs 13, 14 and the rotor 6 which can be pivoted relative to the latter, which seal 19 prevents lubricant from passing from one pressure chamber into an adjacent pressure chamber and/or from migrating radially inwards or outside the camshaft adjuster 1 .
• the seal 19 can be configured as a narrow gap or contact face between the side limbs 13, 14 and the facing end faces of the rotor 6.
• the arrangement of a labyrinth seal, an additional sealing element such as a sealing ring or the like is likewise possible.
• the cut-out 25 is configured as a groove 28 which extends in the circumferential direction.
• the spring element 29 has hook-shaped spring base points 30, 31 which are connected elastically to one another via a helical torsion spring 32 which extends with a plurality of turns in the circumferential direction.
• the hook-shaped spring base point 30 which is bent in a hook-shaped manner approximately over a circumferential angle of 180° and has a diameter which is slightly greater than the external diameter of the end region 27 engages around the end region 27, while the hook-shaped spring base point 31 is bent in a hook-shaped manner approximately over a circumferential angle of 90° and is hooked into the projection 33 of the protrusion 22, which projection 33 is oriented radially inwards.
• the spring element 29 is formed from an elastic material, in particular a resilient metal.
• a spring wire of the torsion spring 32 has a substantially rectangular cross section.
• a stop 34 is arranged in a manner which is offset approximately by 60° in the circumferential direction about the longitudinal axis 5-5 with respect to the projection 33, at a radius which corresponds approximately to the internal radius of the projection 33, on the outer side of which the torsion spring 32 is supported.
• the hook-shaped spring base point 30 of the spring element 29 is hooked into the end region 27 of the pin 21 for substantially finished mounting of the camshaft adjuster 1 itself and finished assembly of the housing 4.
• the associated region of the torsion spring 32 is positioned on the stop 34.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve Device For Special Equipments (AREA)
• Valve-Gear Or Valve Arrangements (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=37983405

Family Applications (1)

Country Status (9)

Cited By (3)

Families Citing this family (40)

Family Cites Families (17)

• 2006
  • 2006-01-21 DE DE102006002993A patent/DE102006002993A1/de not_active Withdrawn
  • 2006-12-06 KR KR1020087017558A patent/KR101304714B1/ko active IP Right Grant
  • 2006-12-06 EP EP06830406A patent/EP1979582B1/de active Active
  • 2006-12-06 CN CN2006800514723A patent/CN101360890B/zh active Active
  • 2006-12-06 JP JP2008550655A patent/JP2009523943A/ja not_active Withdrawn
  • 2006-12-06 DE DE602006016649T patent/DE602006016649D1/de active Active
  • 2006-12-06 AT AT06830406T patent/ATE479827T1/de not_active IP Right Cessation
  • 2006-12-06 US US12/161,118 patent/US20100154732A1/en not_active Abandoned
  • 2006-12-06 WO PCT/EP2006/069360 patent/WO2007082600A1/en active Application Filing
  • 2006-12-06 PL PL06830406T patent/PL1979582T3/pl unknown

Non-Patent Citations (1)

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