摘要:
To cope with requirements for strict accuracy of crankshafts while alleviating the task of controlling a forming process, a preliminary machining step (S117) is added before primary mass balance measurement (S118) prior to boring of center holes into opposite end surfaces of a crankshaft mold. In the preliminary machining step (S117), balance weight portions of the crankshaft mold are machined.
摘要:
A bicycle axle assembly is provided with an axle including a rotational axis, a bearing, a bearing adapter and a conical element. The bearing includes a cone disposed on the axle, a cup and a plurality of roller elements disposed between the cone and the cup such that the cup rotates relative to the cone about the rotational axis. The bearing adapter includes a tubular mounting section for mounting to a tubular member and a bearing housing section housing the bearing therein. The bearing housing section has a tapered abutment angled relative to the rotational axis at a first abutment angle and contacting a tapered contact surface of the cup. The conical element is disposed on the axle. The conical element has a tapered abutment angled relative to the rotational axis at a second abutment angle and contacting a tapered contact surface of the first cone. The second abutment angle of the tapered abutment of the conical element is smaller than the first abutment angle of the bearing housing section.
摘要:
In a crankshaft of an in-line four-cylinder engine, an arm that is closest to a flywheel has a greater average thickness in a direction of the rotation axis of the crankshaft than those of other arms. Two of the arms that are coupled to both sides of the third journal from the flywheel each have a center of gravity closer to its own counterweight compared to the centers of gravity of the arms that face the two arms with corresponding crankpins in between. Accordingly, the rigidity against torsional deformation and the thickness of oil films on the journals are reliably maintained while suppressing increase in the weight of the entire crankshaft.
摘要:
A lightweight crankshaft (1), with eccentric structures, such as con-rods, main bearings, etc., comprises cavities (2, 3, 4, 5, 7, 10, 12) and/or recesses (8) for weight reduction, both in the region of the axis of rotation and isolated therefrom in the region of the eccentric structures. According to the invention at least one cavity is provided (2, 3, 4, 6, 7, 10, 12) in which a stabilizing filler material (5) is located. Said stabilizing filler material can, for example, be a metal foam.
摘要:
A cast hollow crankshaft for an internal-combustion engine and its manufacturing method are provided, which can reduce the weight by coring-out, can prevent bending of a core during manufacturing and floating of the core during pouring of molten metal so as to achieve precise manufacturing and provide the good productivity, and can eliminate the need of machining of oil holes. In the cast hollow crankshaft, a hollow portion has an elliptical cross section at a journal portion and/or a pin portion. Oil holes of the journal portion and the pin portion are formed by coring-out. The hollow portion also has an elliptical cross section at an arm portion. The manufacturing of this crankshaft uses a core that bends in a horizontal direction and has an elliptical cross section in which a major axis extends in a vertical direction at a journal part and/or a pin part. The hollow portion and the oil holes are formed integrally with each other by enveloped-casting with the use of the core that bends in the horizontal direction and includes a plurality of baseboard portions extending toward a mold or extending vertically toward the mold at the journal part and/or the pin part.
摘要:
A crankshaft for a V-type six-cylinder engine is equipped with first through sixth crankpins, first through fourth crank journals, and first through ninth arms for connecting the crank pins and the crank journals to each other. Of the first through ninth arms, the third arm and the seventh arm respectively have surplus weight portions (inclusive of counterweights) whose centers of gravity are situated respectively in a direction substantially opposite the first crank pin and the sixth crank pin.
摘要:
The invention pertains to a method for deep-rolling radii or fillets (2) at the transition between the bearing journals (3) and the adjacent flange (4) of a bearing point of a crankshaft (1) with the aid of deep-rolling cylinders. The deep-rolling cylinders are pressed into the radius or the fillet (2) of the transition with a deep-rolling force until a predetermined roll-down depth (10) is reached while the crankshaft (1) is turned. The transition is initially deep-rolled with a first deep-rolling cylinder, the radius (6) of which has an osculating ratio between 1 and 0.85 referred to the radius of the transition or the fillet (2), namely with a first deep-rolling force that produces a maximum internal compressive stress (7) in the transition at a depth between 1 and 2 mm below the deep-rolled surface (8). The same transition is subsequently rerolled with a second deep-rolling cylinder that has a smaller radius (14) than the first deep-rolling cylinder (5), the magnitude of which is chosen such that the second deep-rolling cylinder causes a further plastic deformation (11) on the deep-rolled surface (8) of the transition in addition to the plastic deformation achieved with the first deep-rolling cylinder.
摘要:
A crankshaft has a helical drive gear formed as one of the crank webs at an end portion thereof. Another crank web outside of the drive gear is made in two parts, an integral balance weight mounting portion and a removable balance weight. In one embodiment, a crankshaft 12 features a crankshaft body 33 including a gear 24 for outputting rotation formed on one side of a crankpin 17d. The crankshaft also includes a first balance weight mounting portion 30g formed on the other side of the crankpin 17d and a first balance weight 31g to be mounted to the first balance weight mounting portion 30g. The crankshaft body 33 may be formed with a second balance weight mounting portion 30a separately from the first balance weight mounting portion 30g, and a second balance weight 31 a mounted to the second balance weight mounting portion.
摘要:
The invention relates to a crankshaft bearing for a motor vehicle, in which a crankshaft 1 produced from ADI (austempered ductile iron, DIN EN 1564) is supported on an engine block 2 produced from aluminum without the interposition of other components. There is very little difference between the thermal expansion coefficients between ADI and aluminum materials, ensuring that the bearing operates reliably even when there are fluctuations in temperature.
摘要翻译:本发明涉及一种用于机动车辆的曲轴轴承,其中由ADI(奥氏体球墨铸铁,DIN EN 1564)生产的曲轴1支撑在由铝制成的发动机缸体2上,而不插入其它部件。 在ADI和铝材料之间的热膨胀系数之间几乎没有什么区别,即使温度波动也能确保轴承运行可靠。
摘要:
A rotational component, such as a crankshaft for an internal combustion engine or the like, has fractional portions of the circumferential journal surfaces selectively hardened, as by induction hardening for example. The selectively hardened portions of the journal surfaces may include radially facing bearing surfaces, journal fillets, and other critical zones such as oil hole breakout zones and thrust face fillets. Selective hardening reduces component distortion and processing costs while providing the desired durability enhancement.