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
  • 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
  • F01L2001/34479—Sealing of phaser devices
• • 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
  • F01L2301/00—Using particular materials
  • F01L2301/02—Using ceramic materials
• • 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
  • F01L2303/00—Manufacturing of components used in valve arrangements
• • 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
  • F01L2820/00—Details on specific features characterising valve gear arrangements

Definitions

• the invention relates to a camshaft adjuster with a driven by a crankshaft of an internal combustion engine stator, a rotationally fixed with a
• Camshaft of the internal combustion engine connectable rotor having a plurality of rotor blades radially outwardly projecting wings, wherein between the stator and the rotor arranged working chambers are divided by the wings in pressure chambers, and wherein the stator and the rotor are made as sintered components.
• Camshaft adjusters are used in modern internal combustion engines to optimize the consumption and performance values and serve to change the opening and closing times of the gas exchange valves to the phase relation between crankshaft and camshaft in a defined angular range, between a maximum early and a maximum late position, variable to be able to shape.
• the camshaft adjuster is integrated into a drive train via which torques are transmitted from the crankshaft to the camshaft.
• the camshaft adjuster has one of the
• both pressure chambers are permanently filled with pressure medium, so that the rotor and the stator are relatively rigidly connected.
• the timing of the gas exchange valves are changed in that the pressure in one of the pressure chambers is increased, while the pressure in the other pressure chamber is lowered.
• the pressure medium must be supplied to the one pressure chamber and discharged from the other pressure chamber to a tank, which changes the angular position between the camshaft and the crankshaft.
• the invention is therefore based on the object to provide a camshaft adjuster, in which the required for the function of the camshaft adjuster precision can be achieved at a significantly reduced finishing costs while cost-effective production.
• the end surfaces are preferably post-processed by means of height calibration.
• the height of the respective component and the parallelism of two opposing surfaces can in this way by a deliberate plastic deformation of the sintered material in a simple and cost-effective manner by means of a
• the displacement recesses are formed three-dimensionally facet-shaped and each have a bottom surface and substantially
• the web structures preferably form a calibration structure.
• Displacement recesses arranged on the end faces such that at least a portion of the web structures forms a continuous structure, which limits the end faces circumferentially. This encircling structure seals at
• Camshaft adjuster so that the leakage can be significantly reduced.
• the calibration structure preferably has an area proportion adapted to the size of the sintering components.
• the area fraction is accordingly dependent on the size of the stator or the rotor.
• the calibration structure forms a larger surface area for smaller components than for larger components. Even with smaller components, this can advantageously reduce the leakage and at the same time provide the necessary displacement space. In addition, a further deformation and thus an unwanted reduction in height of the components can be avoided during operation.
• the area ratios between the displacement recesses and the calibration structure contribute significantly to the degree of deformation achieved and thus the precision with regard to achieving a certain height dimension.
• This elastic component must be kept low because it is considered to be a difficult parameter to control in the later tightening of the component in the
• Camshaft adjuster applies and can have a negative impact there. Since, however, in such manufacturing processes, the elastic deformation component can not be entirely avoided during calibration, this is also compensated by a suitable method
• Embodiment of the surface structure of the invention brought to a low and manageable level, which, for example, by a targeted
• the angle of inclination of the trapezoidal side surfaces may be provided adapted to the surface portion of the calibration. Basically, it has been found that with a decreasing proportion of the recessed area (displacement recesses), the transitions between raised and recessed areas must be steeper, and vice versa.
• FIG. 1 shows a stator and a rotor of a known camshaft adjuster in perspective view
• FIG. 2 a rotor of a camshaft adjuster according to the invention in FIG.
• FIG. 4 is a plan view of the wing of FIG. 3,
• FIG. 5 a stator of a camshaft adjuster according to the invention in FIG.
• FIG. 6 is an enlarged partial view of the stator of FIG. 5 and
• Fig. 7 shows a stator of another embodiment of a camshaft adjuster according to the invention in a perspective view.
• Fig. 1 shows a known camshaft adjuster 1, with which during the
• Camshaft is changed. By turning the camshaft, not shown, the opening and closing times of the gas exchange valves are shifted so that the internal combustion engine brings its optimal performance at the respective speed.
• the Schwenkmotorversteller 1 allows a continuous adjustment of the camshaft relative to the crankshaft.
• the camshaft adjuster 1 has a cylindrical stator 2, which is non-rotatably connected to a gear 3.
• the gear 3 is a sprocket over which a chain, not shown, is guided.
• the gear 3 may also be a toothed belt, via which a drive belt as
• stator 2 and the gear 3 are integrally formed with each other in this embodiment. Screws brace a stator cover, not shown, against the unit of stator 2 and gear 3. Are in an alternative
• Embodiment stator 2 and gear 3 separate parts, so the stator 2 is clamped by means of screws between the gear 3 and a stator cover.
• the stator 2 is provided with radially inwardly projecting webs 5. Circumferentially between these webs 5 wings 6 of a rotor 4 are arranged.
• the rotor 4 has a rotor hub 7, which is rotatably connected to the camshaft. For this purpose, the rotor hub 7 is shrunk or pressed onto a camshaft end. In order to change the angular position between the camshaft and the crankshaft, the rotor 4 is rotated relative to the stator 2 against the force of a spiral spring.
• the hydraulic fluid is pressurized in the pressure chambers 8 assigned to one direction of rotation, while the pressure chambers 9 assigned to the other direction of rotation are relieved to the tank.
• This the other direction of rotation associated pressure chambers 9 are shown in the drawing in the minimum state.
• Camshaft adjuster 1 - the rotor 4 the necessary for the engine start early
• Pressure chambers 8, 9 are not shown in detail a locking bolt by the spring force of a helical compression spring, not shown in a
• Locking position moves, in which this engages in a locking opening of the stator cover, not shown.
• the locking bolt is loaded by the hydraulic fluid against the spring force and pushed back, so that the rotor 4 is unlocked from the stator cover and the camshaft adjuster 1 can get into its control position.
• the pressure chambers 8,9 can be supplied with hydraulic fluid via transverse bores 11, 12 or the hydraulic fluid can be drained from them.
• a hydraulic valve is arranged coaxially aligned within the camshaft end, which has at least one hydraulic piston.
• the stator 2 and a rotor 4 of the camshaft adjuster 1 are generally made of steel or aluminum alloys and are produced in the sintering process. To ensure proper operation of the camshaft adjuster 1 follows In the process steps of pressing, green machining and sintering, this involves a relatively complex finish consisting of various processes
• the camshaft adjuster 1 has on axially formed end faces of the stator 2 and / or the rotor 4th
• Fig. 2 shows a rotor 4 of a first embodiment of a
• Camshaft adjuster 1 according to the invention. End surfaces 13, 15, which rests after assembly of the camshaft adjuster 1 on an inner surface of the stator 2, have displacement recesses 14, in which the material of the rotor 4 during a deforming Nachbearbeitungsvons the end faces 13, 15 can flow. This post-processing is advantageously carried out by means of
• displacement recesses 14 are provided on the axial end faces 13, 15 substantially uniformly distributed, it is possible to a Impairment of the carrying capacity of the end faces 13, 15 to avoid, so that a certain surface pressure during operation of the camshaft amplifier 1 is not exceeded.
• the displacement recesses 14 have a three-dimensionally facet-shaped design and each have a bottom surface 16 and in the
• the web structures 18 have essentially the same width distributed over the end faces 13, 15.
• the entirety of the web structures 18 forms a calibration structure which has an area proportion adapted to the size of the component. This can be a further deformation and thus an unwanted
• the area ratios between the displacement recesses and the calibration structure contribute significantly to the degree of deformation achieved and thus the precision with regard to achieving a certain height dimension.
• This elastic component must be kept low because it is considered to be a difficult parameter to control in the later tightening of the component in the
• Camshaft adjuster 1 is valid and can have a negative impact there.
• the displacement recesses 14 and the web structures 18 are arranged on the end faces 13, 15 such that a part of the web structures 18 form a continuous structure which circumscribes the end faces 13, 15.
• This circumferential structure allows for the application of the respective end face 13, 15 on inner surfaces of the stator 2, a secure seal of the end faces 13, 15, so that the leakage can be significantly reduced.
• This part of the web structures 18 can be made wider than the inner web structures 18 to improve the seal.
• Fig. 5 and 6 show a stator 2 of the first embodiment, which is formed integrally according to FIG. 1 with a gear 3. As already described for the rotor 4, the stator 2 has at its end faces 19, 20 the displacement recesses 14 already described. It will be on top
• Fig. 7 shows a stator 2 of another embodiment, to which a toothed belt pulley or a pulley is rotatably fastened.
• the described calibration structure with the displacement recesses 14 may be provided according to the invention on the rotor 4 or on the stator 2 or on both components, but finds in particular their advantageous application to the end faces 19, 20 of the stator 2.
• the operating conditions include in particular high temperatures at which the creep resistance of the materials adversely changes as well as axially and in particular radially acting mechanical forces, which can bring additional axially acting force components on the surface structured according to the invention.
• Deformation of a rotor 4 accommodates in the tension on the camshaft end and thereby contribute to a further improvement in function at the same time reduced manufacturing costs.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve Device For Special Equipments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=56694093

Family Applications (1)

Country Status (5)

Families Citing this family (5)

Family Cites Families (3)

• 2015
  • 2015-07-30 DE DE102015112442.4A patent/DE102015112442B3/de not_active Expired - Fee Related
• 2016
  • 2016-07-25 WO PCT/EP2016/067660 patent/WO2017017058A1/de active Application Filing
  • 2016-07-25 EP EP16753262.1A patent/EP3329104A1/de not_active Withdrawn
  • 2016-07-25 CN CN201680043116.0A patent/CN107995936B/zh not_active Expired - Fee Related
• 2018
  • 2018-01-08 US US15/864,114 patent/US10480360B2/en not_active Expired - Fee Related

Also Published As

Similar Documents

Legal Events