• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for producing a sintered gearwheel (1) with a wheel body (2) which is delimited in the axial direction (3) by a first axial end face (4) and a second axial end face (5), and with at least a track (8, 10, 12) for at least one belt drive arranged on a radial peripheral surface (7) which extends between the first axial end face (4) and a second axial end face (5), wherein the Radkörper (3) is made of a sintered material by a powder metallurgy process, comprising the steps of pressing a powder to a green compact, wherein during pressing on or in the second axial end face (5) has a sealing surface (14) for arranging a sealing element ( 15) is formed, and sintering of the green body, and wherein the wheel body (3) is treated oxidizing after sintering, at least in the region of the sealing surface (14).
    公开号:AT517751A1
    申请号:T50820/2015
    申请日:2015-09-29
    公开日:2017-04-15
    发明作者:
    申请人:Miba Sinter Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a method for producing a sintered gearwheel with a wheel body which is delimited in the axial direction by a first axial end face and a second axial end face, and with at least one track for at least one loop drive which is located on a radial peripheral face extending between the the wheel body is made of a sintered material by a powder metallurgy method, comprising the steps of pressing a powder into a green compact, wherein during pressing on or in the second axial end face a sealing surface for Arrangement of a sealing element is formed, and sintering of the green compact.
    To drive ancillaries in motor vehicles usually crankshaft gears are used. If these are to be equipped with more than one track for a belt drive, a powder-metallurgical process is suitable due to the easier manufacture of complex geometries. Problems arise when using sintered crankshaft wheels, however, if in the crankshaft wheel, the transition from the wet area with a liquid lubricant in the dry area without lubricant should take place. The crankshaft wheel must then be made oil-tight at least in the region of the sealing surfaces, but this creates problems in view of the porosity of sintered materials. In particular, the crankshaft sprocket must be formed without swirling in the region of the sealing surfaces, so that the lubricant is not pulled out over the sealing surface.
    In the prior art, twist freedom is usually produced by a significant reduction in surface roughness. For example, the entire affected surface can be ground at once by means of plunge grinding. Another known method is the burnishing. However, these methods are complex or not feasible in hard to reach areas.
    It is therefore the object of the invention to provide a simpler method for producing a twist-free sintered gear, which can be used in particular as a crankshaft sprocket in a crankshaft drive.
    This object of the invention is achieved in the aforementioned method in that the wheel body is treated oxidizing after sintering, at least in the region of the sealing surface to form the sealing surface twist-free.
    Due to the oxidizing treatment of the sealing surface of the sintered material is at least partially oxidized in this area to oxides. As a result, the pores, which are present in the sealing surface, grow at least partially, whereby the tightness against oil leakage is increased. It is thus no longer necessary to reduce the surface roughness of the sealing surface, but rather may have the surface roughness set after sintering the sintering gear by at least one of these process steps (i.e., the sealing surface is sintered or calibrated). This in turn is not only advantageous for reasons of cost, but is achieved in that a sealing element used in the region of the sealing surface due to the higher roughness has a better fit, whereby the Verwinden or squeezing of the sealing ring during operation of the gear can be better avoided and so that in turn the tightness of the sealing surface can be further improved.
    To further improve the fit of the sealing element on the sealing surface can be provided according to an embodiment of the method that the sealing surface with an average roughness Rz according to DIN EN ISO 4287 DIN bwz. DIN 4768/1 between 0.8 pm and 25 μιτι is produced.
    It should be noted at this point that all the standards cited are to be understood in the version valid at the filing date of the application, unless stated otherwise.
    It can further be provided that during the pressing of the powder on the first axial end face a plurality of friction-increasing elements are formed, which protrude beyond the first end face and / or that during the pressing of the powder on the second axial end face a plurality of friction-increasing elements are formed over projecting the second axial end face. It can thus be increased against rotation of the sintered gear on another component, in particular on the crankshaft, and as a result, the tightness of the connection of the sintered gear to the other component.
    It is advantageous if the friction-increasing elements are at least once, inductively hardened or laser-hardened. By increasing the hardness can be achieved that press the friction-enhancing elements during assembly with the other component in the surface, which in addition a positive connection between the joining surfaces of the sintered gear and the other component is achieved. This in turn can improve the security against rotation and thus the tightness of the connection of the sintered gear to the further component.
    To further improve these effects can be provided that the friction-increasing elements are strip-shaped with a longitudinal extent in the radial direction.
    In order to facilitate the penetration of the friction-increasing elements or the displacement of the material during penetration can be provided according to further embodiments of the method that the strip-shaped elements are formed with an at least approximately triangular cross-section and / or that immediately adjacent to the friction-enhancing elements depressions in the first axial end face and / or formed in the second axial end face. It can thus also the seat of the sintered gear and thus the tightness of the seat can be improved on the other component.
    The sintered gear can be produced at least with a chain toothing. It is advantageous if the at least one track of the sintered gear is formed by a sprocket toothing, and that the sprocket toothing is at least once inductively hardened or laser hardened. Induction or laser hardening has the advantage that the necessary heat is introduced into the component only in the areas to be hardened, as is known per se. It can be largely avoided so that an influence on the oxidized surface areas of the sintered gear, so that the liquid-tightness of the sintered gear is maintained even when subsequent to the heating quenching. This in turn avoids that the cooling liquid, which is used for quenching the sintered gear, penetrates into the wheel body, whereby an optionally occurring destruction of the tightness of the sealing surface can be avoided.
    According to a further embodiment variant of the method, provision may be made for the wheel body to be provided with an elastomeric material in at least one partial area, wherein before the application of the elastomeric material, this at least one partial area is treated oxidatively. By the oxidizing treatment, as stated above, the pores of the sintered gear are closed in the oxidizing treated area. It is thus avoided that coolant from the quenching of the sintered gear penetrates during curing in the wheel body. It is again advantageous if the wheel body is heated for curing only in the areas to be cured, as stated above. By avoiding the ingress of coolant, a better adhesion of the elastomeric material to the wheel body is achieved. This in turn can improve the tightness of the connection of the sintered gear with the other component directly or indirectly. Indirectly insofar as the elastomeric material can be applied to a toothing of a (further) track of the sintered gear and improved by the better adhesion, the running accuracy of this belt drive and thus the connection sintered gear / further component can be formed unaffected.
    To further improve the tightness of the connection of the sintered gear to another component can be provided that the sealing surface is rolled before the oxidizing treatment. By rolling the sealing surface can be given a higher hardness without subsequent hardening. This higher hardness has a positive effect on the seat of a sealing element on the sealing surface.
    For a better understanding of the invention, this will be explained in more detail with reference to the following figures.
    Each shows in a simplified, schematic representation:
    Figure 1 is a multi-track sintered gear in an oblique view.
    Fig. 2, the multi-track sintered gear of Figure 1 in another Schrägan view.
    3 shows a cross section through a multi-track sintered gear.
    4 shows a section of the sintered gear in the region of a friction-increasing element in cross-section.
    By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.
    In Figs. 1 and 2, an embodiment of a sintered gear 1 is shown.
    Under a sintered gear 1 is understood according to the invention, a gear that is produced by a powder metallurgy process, ie after a sintering process, or that is produced by a process comprising powder metallurgical process steps.
    Next is understood by a sintered gear 1, a gear which is a gear for a belt drive, so a gear which has at least one toothing for a chain drive and / or at least one toothing for a toothed belt drive, or which is a gear that with another gear is in meshing engagement, so is a gear for a gear drive. The sintered gear 1 can also be designed to be usable both for a belt drive and for a gear drive, if it is multi-lane.
    The spur gear 1 has a wheel body 2. In an axial direction 3, the wheel body 2 is delimited by a first axial end face 4 and a second axial end face 5 opposite this in the axial direction. In a radial direction 6 of the wheel body is bounded by a peripheral surface 7. The circumferential surface 7 extends between the first axial end face 4 and the second axial end face 5.
    On the peripheral surface 7 are a first track 8 with a first toothing 9, a arranged in the axial direction 3 next to this second track 10 with a second toothing 11 and arranged in the axial direction 3 next to this third track 12 with a third toothing thirteenth designed for each one Umschlingungstrieb. In the embodiment variant shown concretely, the first and the third teeth 9, 13 are designed as toothed belt toothings for the engagement of a respective toothed belt and the second toothing 11 as a sprocket toothing for the engagement of a chain.
    The concrete design and the number of respective gears 9,11,13 depends on the use of the sintered gear 1. The sintered gear 1 can therefore only one or two or more than three of these gears 9,11,13 or tracks 8.10 12. Preferably, however, the sintered gear 1 has at least one toothed belt toothing and at least one sprocket toothing.
    In the preferred embodiment, the sintered gear 1 is a so-called crankshaft gear of an engine and is used to drive ancillaries of a motor vehicle, such as a water pump or an oil pump, etc. Mehrspurige
    Crankshaft gears are known in principle from the prior art, so reference is made to further details on the relevant prior art.
    The sintered gear 1 is manufactured using a powder metallurgy method. Since the sintering technique is known per se from the prior art, reference is also made to further details on the relevant prior art.
    To produce the spur gear 1, a metallic powder is used. A metallic powder is also understood to mean a powder mixture or it is also possible to use powder particles of a metal alloy. In particular, as the metallic powder, a sintered steel powder or an iron-containing powder is used, as it is known for the production of sintered components. Typical powder mixtures are, for example: Fe (pre-alloyed with 0.85% by weight Mo) + 0.1% by weight - 0.3% by weight C + 0.4% by weight -1.0% by weight -% pressing aids and possibly binder - Fe + 1 wt .-% - 3 wt .-% Cu + 0.5 wt .-% - 0.9 wt .-% C + 0.3 wt .-% - 0.8 % By weight of pressing assistant and possibly binder - Astaloy CrM (Cr + Mo prealloyed iron powder) + 1% by weight - 3% by weight of Cu + 0.1% by weight -1% by weight of C + 0.3 Wt .-% -1.0 wt .-% pressing aid and possibly binder.
    However, this list of powder mixtures is not exhaustive.
    The powder is pressed into a green compact in a powder press and then sintered in one or more stages, in particular under an inert gas atmosphere. In the powder press, the green compact is at least substantially given its final shape, for example as shown in FIG. 1, whereby, of course, various size changes caused by sintering are taken into account, provided that the spur gear 1 does not produce net-shape or near net-shape quality is presented. With the aid of the sintering method, it is possible that the sintered gear 1 is produced in one piece.
    If necessary, to increase the component accuracy, the sintered gear 1 can be calibrated after sintering by pressing the sintered gear 1 in a calibration die with a corresponding geometry between two punches.
    It is further possible for the sintered gear 1 to be left after sintering and prior to calibration or, preferably, after calibrating a mechanical post-processing, such as, e.g. Turning, high, deburring, etc., is subjected.
    The sintered gear 1 has a sealing surface 14 on or in the second axial end face 5. This is already produced during the pressing of the powder. The sealing surface 14 serves to arrange a sealing element 15, which can be seen from FIG. 3, which shows a two-lane variant of the sintered gearwheel 1 with the first track 8 and the second track 10. The sealing element 15 is intended to prevent liquid lubricant, in particular lubricating oil, from escaping via the sintered gearwheel 1.
    The sealing element 15 may be a Simmering or O-ring, which may consist of an elastomeric material, in particular a rubber, or of a composite material of an elastomeric and a metallic material. It is also possible that the sealing element 15 is vulcanized onto the sealing surface 14.
    As is further apparent from FIG. 3, at least one further sealing element 16 can be arranged between the sintered gearwheel 1 and an end face 17 of a crankshaft 18.
    It should be noted in this context that the sintered gear in the second end face 5 may have a recess in which the end of the crankshaft 18 is received, as shown in FIG. 3 can be seen.
    Due to the porosity of the sintered gear 1 after sintering and the rotation of the other component, in particular a crankshaft, it may happen that the liquid lubricant is pulled out via the sealing surface 14, i. that the sealing surface 14 is not twist-free. To prevent this, i. In order to ensure the freedom from twisting of the sealing surface 14, it is provided that the surface of the sintered gear wheel 1 is treated oxidatively, at least in the region of the sealing surface 14. It is possible for the non-oxidizing regions of the sintered gear 1 to be covered appropriately, i. can be protected from the action of the oxidizing agent. On the other hand, it is also possible and preferred that the entire sintered gear 1 is superficially oxidized.
    The oxidation can be carried out with carbon dioxide or air or oxygen or water vapor or mixtures thereof as oxidizing agent.
    The oxidation is preferably carried out at a temperature between 400 ° C and 800 ° C, in particular between 550 ° C and 620 ° C.
    Furthermore, the oxidation can be carried out with a quantity conversion of oxidizing agent between 40 kg / h and 100 kg / h. As a result, a uniform oxidation is achieved within a relatively short time, so that on the one hand achieved a process shortening and on the other hand, a relatively uniform formation of the oxides on the surface of the particles of the sintered gear 1.
    The time for the oxidation is preferably selected from a range of 60 minutes to 420 minutes, especially from a range of 90 minutes to 200 minutes.
    The proportion of the at least one oxidizing agent in the oxidation atmosphere may be between 75% by volume and 90% by volume, in particular between 80% by volume and 90% by volume, preferably between 85% by volume and 90% by volume. , amount. The remainder to 100 vol .-% forms in each case air. In particular, a quantity conversion of oxidizing agent is between 40 kg / h and 100 kg / h, preferably between 75 kg / h and 90 kg / h.
    The oxidation is preferably carried out so far that the layer thickness of the oxide layer is between 1 pm and 5 pm, in particular between 2 pm and 4.5 pm.
    The oxidizing treatment is carried out in the process for producing the spur gear 1 after sintering or after calibration, if calibration is carried out, or after mechanical post-processing, if this is carried out. It is thus avoided on the one hand that the calibration can be performed incomplete or only with higher pressure due to hard oxides or that the oxides are partially removed by the mechanical post-processing, what in this case the layer thickness of the oxide layer larger and thus the oxidation time would have to be extended significantly.
    Due to the oxidative treatment of the surface of the sintered gear 1 at least in the region of the sealing surface 14, it is not necessary that this sealing surface 14 is particularly flat, i. with a very low roughness, is produced. Rather, according to a variant embodiment of the method, it is provided that, at least in the region of the sealing surface 14, this surface has an average roughness Rz according to DIN EN ISO 4287 DIN and DIN 4768/1 between 0.8 μιτι and 25 μηη, in particular between 2 μιτι and 12 μιτι, will be produced.
    According to a further embodiment variant of the method can be provided that during the pressing of the powder on the second axial end face 5 a plurality of friction-increasing elements 15 are formed, which protrude beyond the second axial end face 5, as shown in Fig. 2.
    It is also possible for such friction-increasing elements 19 to be arranged on the first axial end face 4 (FIG. 1), in particular if another component, for example a further toothed wheel or a toothed belt wheel, is connected to the sintered toothed wheel 1 via the first axial end face 4 becomes.
    The sintered gear 1 is connected to a further component, in particular shaft, preferably the crankshaft 18 (FIG. 3), secured against rotation. By the friction-increasing elements 19, this non-rotating connection can be improved.
    Preferably, the friction-increasing elements 19 are arranged distributed uniformly in the circumferential direction of the sintered gear 1, so that therefore a distance between these friction-increasing elements 19 is consistently large.
    In the embodiment variant of the sintered gear wheel 1 shown in FIGS. 1 and 2, six such friction-increasing elements 19 are arranged or formed on the first axial end face 4 and the second axial end face 5, respectively. However, this number is not restrictive. It is also possible for more or fewer than six such friction-increasing elements 19 to be arranged or formed.
    Furthermore, it is not absolutely necessary, albeit preferred, that these friction-increasing elements 19 all have the same shape.
    In principle, the friction-increasing elements 19 may have any suitable shape, for example conical, pyramidal, etc. In the preferred embodiment of the sintered gear wheel 1, however, the friction-increasing elements 19 are strip-shaped with a longitudinal extension 20 in the radial direction 6.
    Furthermore, the cross-section of the friction-increasing elements 19 can also be of any desired design. Preferably, however, the (strip-shaped) elements 19 are formed with an at least approximately triangular cross section (viewed in the direction of the longitudinal extent 20), as shown in FIG. 4, which shows a section of a further embodiment variant of the sintered gear wheel 1. The friction-increasing elements 19 may have an exactly triangular cross section (in particular in the form of an equilateral or equilateral triangle). But it is also possible that the tip of the triangular cross-section of the friction-increasing elements 19 is rounded, as shown in Fig. 4. The radius of curvature can be selected from a range of 0.05 m to 0.3 m.
    As can further be seen from FIG. 4, according to another embodiment variant of the method, preference is given directly adjacent to the friction-increasing
    Elements 19 wells 21 formed in the first axial end face 4. In particular, these depressions are formed on both sides of the friction-increasing elements 19 (viewed in the circumferential direction), as can be seen from FIG. 4.
    The last-mentioned embodiments can also be applied to the optionally existing friction-increasing elements on the second axial end face 5.
    The production of the friction-increasing elements 19 is preferably carried out already during the pressing of the powder, ie before sintering. For this purpose, corresponding depressions for the friction-increasing elements 19 or corresponding elevations for the depressions 21 are formed in or in the punch (s).
    As can be seen from FIG. 2, for arranging the sintered gear wheel 1 on a further component, in particular the crankshaft 18 (FIG. 3), a projecting positioning element 22 can be arranged on the second axial end face 5.
    According to a further preferred embodiment of the method can be provided that the friction-increasing elements 19 are hardened. Curing takes place in particular by induction hardening or laser hardening, which is carried out at least once or several times.
    If the sintered gear 1 also has a sprocket track, that is, for example, the second track 10 in FIG. 1, the sprocket toothing, that is to say the toothing 11 in FIG. 1, likewise undergoes inductive or laser hardening at least once or several times.
    It is preferred that only the friction-increasing elements 19 and optionally the sprocket toothing are subjected to inductive or laser hardening.
    The inductive or laser curing can be carried out according to the relevant prior art.
    It is thus possible to produce a hardness of the friction-increasing elements 19 of at least 300 HV 5, in particular a hardness between 300 HV 5 and 650 HV 5.
    After the sintering gear 1 is quenched for curing, curing is carried out after the oxidative treatment of the sintered gear 1. It can thus be prevented that deterrent penetrates into the pores of the sintered gear 1 and interferes with subsequent processing steps.
    As already stated above, the sintered gear 1 has at least one track with a toothed belt toothing. In the sintered gear 1 shown in FIG. 1, these are the first track 8 with the toothing 9 and the third track 12 with the toothing 13. This at least one track with a toothed belt toothing can on the toothed belt toothing at least on the radial end faces with a coating 23 an elastomeric material, in particular provided with a rubber coating. However, the toothing 11 of the second track 10, ie the sprocket toothing, is preferably at least partially provided with such a coating for improving the acoustics.
    In order to improve the adhesion of the coating 23 on the or the toothing (s) 9 and / or 11 and / or 13, the toothing 9 or 11 or 13 or the teeth 9 and / or 11 and / or 13 before the Coating with the elastomeric material also treated oxidizing. It can thus micro motions sintered gear 1 can be prevented, which can be caused by an inaccuracy due to the partially peeling coating 22. As a result, the tightness of the seat of the sintered gear 1 on a further component, in particular the crankshaft 18, can be improved as a result.
    Preferably, the coating of the at least one toothing 9 and / or 11 and / or 13 of the sintered gear 1 with the elastomeric material takes place after the hardening of the friction-increasing elements 19 and the optionally present sprocket toothing.
    As the elastomeric material, a natural or synthetic rubber or a thermoplastic elastomer can be used. For the coating of the sintered gear 1 with the elastomeric material, the following method steps are preferably carried out: washing the sintered gear 1 at least in the region of the surface to be coated, for example with an organic solvent such as perchlorethylene; Activation of the surface of the sintered gear 1 to be coated, in particular by blasting with a blasting medium or with blasting particles; - Application of an adhesive on the surface to be coated of the sintered gear 1; the adhesive may correspond to the prior art for such coatings 23; - Order of the elastomeric material on the surface to be coated of the sintered gear. 1
    It is also possible that not only the at least one toothing 9 and / or 11 and / or 13 of the sintered gear 1 is provided with a coating 23 of an elastomeric material, but that the sealing surface 14 or a further sealing surface of the sintered gear 1, for example in the area of screwing the sintered gear 1 with the other component, with an elastomeric (sealing) material is provided. For example, the sintered gear 1 may be connected via a bolt centered, i. is arranged extending in the axis of the sintered gear 1 and in the axial direction 3, are bolted to the other component, as is known per se for connections of a crankshaft gear with a crankshaft 18.
    To increase the hardness of the sealing surface 14, e.g. for a shaft seal, on o-the in the first axial end face 4 of the sintered gear 1, this can also be hardened. Preferably, however, this sealing surface 14 is only rolled, wherein the rolling is carried out in particular front oxidizing treatment of the sealing surface 14. It can thus a hardness of the sealing surface 14 of at least 90 HV 5, in particular a hardness between 90 HV 5 and 300 HV 5, are produced. The oxides in the sealing surface, which arise as a result of the oxidizing treatment, assist in achieving these hardness values.
    The rolling of the sealing surface 14 is performed with a conventional rolling tool.
    With the described method, therefore, a sintered gear 1 can be produced that has at least one toothed belt track with a toothed belt toothing and optionally at least one sprocket track with a sprocket toothing, the toothed belt track and / or the chain wheel track being provided with a coating 23 of an elastomeric material and hardening the sprocket toothing is, wherein further comprises a sealing surface 14 for arranging a shaft seal oxide particles, and wherein on the first axial end surface 4 friction-increasing elements 19 are formed, which have a hardness of at least 300 HV 5.
    The embodiments show possible embodiments of the sintered gear or describe possible embodiments of the method for its production, it being noted at this point that also various combinations of the individual embodiments are possible with each other.
    For the sake of order, it should finally be pointed out that for a better understanding of the structure of the sintered gearwheel 1, this was shown to be partially uneven and / or enlarged and / or reduced in size.
    REFERENCE SIGNS LIST 1 sintered gear wheel 2 wheel body 3 direction 4 end face 5 end face 6 direction 7 peripheral surface 8 track 9 toothing 10 track 11 toothing 12 track 13 toothing 14 sealing surface 15 sealing element 16 sealing element 17 end face 18 crankshaft 19 element 20 longitudinal extension 21 recess 22 positioning element 23 coating
    权利要求:
    Claims (10)
    [1]
    claims
    1. A method for producing a sintered gear (1) with a wheel body (2) which in the axial direction (3) by a first axial end face (4) and a second axial end face (5) is limited, and at least one track (8 , 10, 12) for at least one belt drive disposed on a radial peripheral surface (7) extending between the first axial end surface (4) and a second axial end surface (5), the wheel body (3) being made of a A sintered material is produced by a powder metallurgical process, comprising the steps of pressing a powder into a green compact, wherein during pressing on or in the second axial end face (5) a sealing surface (14) for mounting a sealing element (15) is formed, and sintering the Green bodies, characterized in that the wheel body (3) is treated oxidizing after sintering at least in the region of the sealing surface (14) in order to form the sealing surface (14) twist-free ,
    [2]
    2. The method according to claim 1, characterized in that the sealing surface (14) is produced with an average roughness Rz according to DIN EN ISO 4287 between 0.8 pm and 25 pm.
    [3]
    3. The method according to claim 1 or 2, characterized in that during the pressing of the powder on the first axial end face (4) a plurality of friction-increasing elements (19) are formed, which project beyond the first axial end face (4) and / or during the pressing of the powder on the second axial end face (5) a plurality of friction-increasing elements (19) are formed which project beyond the second axial end face (5).
    [4]
    4. The method according to claim 3, characterized in that the friction-increasing elements (19) are at least once inductively hardened or laser-hardened.
    [5]
    5. The method according to claim 3 or 4, characterized in that the friction-increasing elements (19) are strip-shaped with a longitudinal extent (20) in the radial direction (6).
    [6]
    6. The method according to claim 5, characterized in that the strip-shaped friction-increasing elements (19) are formed with an at least approximately triangular cross-section.
    [7]
    7. The method according to any one of claims 3 to 6, characterized in that immediately adjacent to the friction-increasing elements (19) depressions (21) in the first axial end face (4) and / or in the second axial end face (5) are formed.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that a track (10) of the sintered gear (1) is formed by a sprocket toothing, and that the sprocket toothing is at least once inductively hardened or laser hardened.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the wheel body (3) is provided in at least a partial area with a elastome ren material, wherein before the application of the elastomeric material, this at least a portion is treated oxidizing.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the sealing surface (14) is rolled prior to the oxidizing treatment.
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    同族专利:
    公开号 | 公开日
    CN106555864A|2017-04-05|
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    DE102016118156A1|2017-03-30|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50820/2015A|AT517751B1|2015-09-29|2015-09-29|Process for producing a sintered gear|ATA50820/2015A| AT517751B1|2015-09-29|2015-09-29|Process for producing a sintered gear|
    CN201610824675.7A| CN106555864A|2015-09-29|2016-09-14|For manufacturing the method and sintered gear of sintered gear|
    DE102016118156.0A| DE102016118156A1|2015-09-29|2016-09-26|Process for producing a sintered gear|
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