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公开(公告)号：US11045864B2
公开(公告)日：2021-06-29
申请号：US16061398
申请日：2016-12-21
发明人： Kenji Tamura , Junichi Okubo
摘要： Disclosed is a method for producing a forged crankshaft. This production method includes: a pressing step of pressing a part in a longitudinal direction (first region) of a bar-like member with a pair of first dies, thereby decreasing a cross sectional area of the first region; and a decentering step of decentering a second region of the bar-like member with a second die with the first region being held. The second region is at least a part of the region of the bar-like member excepting the first region. The decentering direction by the second die is a direction perpendicular to each of the pressing direction by the first dies and the longitudinal direction of the bar-like member.
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公开(公告)号：US20210172470A1
公开(公告)日：2021-06-10
申请号：US17268807
申请日：2019-08-22
发明人： Tatsuhiko ABE , Manabu KUBOTA
摘要： A crankshaft with improved seizure resistance is provided. A crankshaft includes a journal and a pin, each of the journal and pin having such a surface geometry that the arithmetical mean height of the primary profile, Pa, is 0.090 μm or smaller and the reduced peak height Rpk is 0.070 μm or smaller. As used herein, arithmetical mean height of a primary profile Pa is defined in JIS B 0601 (2001), and reduced peak height Rpk is defined in JIS B 0671 (2002).
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公开(公告)号：US20210087645A1
公开(公告)日：2021-03-25
申请号：US17114961
申请日：2020-12-08
摘要： A method for manufacturing a crankshaft for an internal combustion engine with a plurality of journals having a hardened case with a first microstructure. The crankshaft is comprised of a steel comprising between about 0.3 wt % and 0.77 wt % Carbon. The first microstructure of the hardened case of the journals comprises between about 15% and 30% ferrite and a balance of martensite and the resultant subsurface residual stress between 310 MPa and 620 MPa.
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公开(公告)号：US10828693B2
公开(公告)日：2020-11-10
申请号：US15572258
申请日：2016-05-13
发明人： Tomohisa Yamashita , Sho Takamoto , Hiroyuki Kurokawa , Kunihiro Yabuno , Ken Yoshino , Kenji Tamura , Junichi Okubo
摘要： An apparatus for manufacturing a forged crankshaft includes a pair of upper and lower dies and a first tool. The pair of dies deforms first excess portions and thereby thickens both side portions of a rough crank arm, in a region near a rough pin adjacent thereto. The first tool is fitted in an open space made in the pair of dies, and is capable of coming into contact with a rough-journal-facing surface of the rough crank arm, except the side portions in the region near the adjacent rough pin. The first pair of dies and the first tool have first guides to guide the first tool from a retracting position to a contacting position. The first guides include a first guide disposed on at least one of an upper surface and a lower surface of the first tool.
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公开(公告)号：US10330142B2
公开(公告)日：2019-06-25
申请号：US15501013
申请日：2015-08-06
摘要： A crankshaft includes journals that define a central axis of rotation; crank pins that are eccentric with respect to the journals; crank arms connecting the journals to the crank pins; and counterweights integrated with the crank arms. Each of the crank arms has recesses in a surface adjacent to the crank pin. The recesses are disposed inward of peripheral regions in both sides along an edge of the surface, and are disposed along the peripheral regions. The crankshaft has a reduced weight, an increased torsional rigidity and an increased flexural rigidity.
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公开(公告)号：US10107327B2
公开(公告)日：2018-10-23
申请号：US15285902
申请日：2016-10-05
发明人： Fabio Numidi , Giuliano Sperlinga
摘要： A crankshaft for an internal combustion engine includes a shaft body having a body rotation axis, with at least one crank pin for coupling a connecting rod to the crankshaft. The crank pin is connected to the shaft body in an offset manner with respect to the body rotation axis by two crank arms. Each arm has an arm surface facing one to the other with the crank pin extending between the arm surfaces. At least one of the arm surfaces is provided with a protrusion extending from the arm surface and configured to avoid contact between the arm surface and the connecting rod.
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公开(公告)号：US10029297B2
公开(公告)日：2018-07-24
申请号：US15118174
申请日：2015-02-18
发明人： Junichi Okubo , Kenji Tamura , Kunihiro Yoshida
摘要： In a forming apparatus, movable journal dies and stationary journal dies retain rough journal portions of a preform blank therebetween, and reference crank pin die and movable crank pin dies contact rough crank pin portions thereof, and in this state, the movable journal dies and the movable crank pin dies are moved axially toward the reference crank pin die and the reference crank pin die and the movable crank pin dies are moved in a direction perpendicular to an axial direction. With this, weighted rough arm portions are axially compressed to reduce their thickness to that of weighted arms of a forged crankshaft, and the rough crank pin portions are pressed in the direction perpendicular to the axial direction to increase an amount of eccentricity to that of the crank pins of the forged crankshaft.
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公开(公告)号：US20180172064A1
公开(公告)日：2018-06-21
申请号：US15819462
申请日：2017-11-21
发明人： Koichi ONO , Yoshihiko UKAI , Keiichi MATSUNAGA
摘要： A method for manufacturing a crankshaft including a pin portion and a journal portion includes: a preparation process of preparing a die that is formed such that a parting plane of the pin portion and a parting plane of the journal portion are spaced apart from each other in a stamping direction; and a stamping process of forming a shaft portion including the pin portion and the journal portion by stamping a blank with the die.
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公开(公告)号：US20180156263A1
公开(公告)日：2018-06-07
申请号：US15735496
申请日：2016-06-06
CPC分类号： F16C3/20 , F16C3/08 , F16C3/14 , F16C2360/22 , F16F15/24 , F16F15/283
摘要： A crankshaft includes journals serving as a central axis of rotation, crank pins decentered from the journals, and crank arms connecting the journals and the crank pins. Some or all of the crank arms have counterweights integrated therewith. At least one of the crank arms has a recess in a crank pin facing surface. The crank arm includes ribs formed respectively in two side portions of the recess along a periphery of the crank arm.
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公开(公告)号：US20170167529A1
公开(公告)日：2017-06-15
申请号：US15325112
申请日：2015-07-14
发明人： Koichiro ISHIHARA , Ken YOSHINO , Kunihiro YABUNO
摘要： A load due to combustion pressure is applied to each of the crank pins via a connecting rod in a direction from the axis of a piston pin to the axis of the crank pin. Each of the crank arms includes a recess in a surface adjacent to the journal, in a region inward of a peripheral region along the edge of the surface. The recess extends along the peripheral region, and is asymmetric with respect to a crank arm centerline connecting the axis of each of the crank pins to the axis of each of the journals. Each of the crank arms has a maximum flexural rigidity at a point of time when the load onto each of the crank pins due to the combustion pressure reaches a maximum. The crankshaft has a reduced weight and an increased torsional rigidity in combination with an increased flexural rigidity.
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