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公开(公告)号：US10441995B2
公开(公告)日：2019-10-15
申请号：US15560504
申请日：2016-03-31
发明人： Sho Takamoto , Kenji Tamura , Tomohisa Yamashita , Kunihiro Yabuno , Ken Yoshino , Hiroyuki Kurokawa , Junichi Okubo , Koichiro Ishihara
摘要： The disclosed production method includes a die forging step of obtaining a forged blank with flash having a crankshaft shape, and a trimming step of removing the flash from the forged blank while nipping the forged blank with a pair of holding dies. In the forged blank, at least one of the rough crank arms have, in a region near an adjacent rough pin, a first excess portion protruding from an outer periphery of a side portion of the rough crank arm. When the forged blank is nipped with the pair of holding dies, the first excess portion is deformed by the pair of holding dies to bulge toward an adjacent rough journal.
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公开(公告)号：US10058912B2
公开(公告)日：2018-08-28
申请号：US15031294
申请日：2014-11-19
发明人： Kenji Tamura , Junichi Okubo , Koichiro Ishihara , Ken Yoshino , Kunihiro Yabuno , Hiroyuki Kurokawa , Tomohisa Yamashita , Sho Takamoto
CPC分类号： B21K1/08 , B21J5/025 , B23P15/00 , B23P2700/07 , F16C3/08 , F16C2220/46
摘要： A method for producing a forged crankshaft includes a die forging step, a trimming step, and an excess projecting portion bending step. The die forging step forms a finish forged blank with flash, the finish forged blank including a shape of the crankshaft, in which crank arms have excess projecting portions at outer peripheries of side portions thereof near a crank pin, the excess projecting portions projecting from the outer peripheries. The trimming step removes the flash from the finish forged blank formed in the die forging step. The excess projecting portion bending step bends the excess projecting portions of the crank arms toward a journal-side surface of the crank arm by inserting a first die having a U-shape from a direction of eccentricity of the crank pin to the crankshaft obtained by removing the flash in the trimming step.
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公开(公告)号：US10012260B2
公开(公告)日：2018-07-03
申请号：US15028445
申请日：2014-10-14
摘要： A crankshaft includes: journals that define a central axis of rotation; crank pins that are eccentric with respect to the journals; and crank arms for connecting the journals and the crank pins, wherein each of the crank arms or at least one of the crank arms integrally includes a counterweight. The crank arms have a recess in a surface adjacent to a corresponding one of the journals, the recess disposed inward of a peripheral region along a periphery of the surface, the recess disposed along the peripheral region. With this configuration, it is possible to provide a crankshaft which has reduced weight and increased torsional rigidity in combination with increased flexural rigidity.
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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：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：US10464120B2
公开(公告)日：2019-11-05
申请号：US15531788
申请日：2015-12-10
发明人： Kenji Tamura , Junichi Okubo , Ken Yoshino , Kunihiro Yabuno , Hiroyuki Kurokawa , Tomohisa Yamashita , Sho Takamoto , Koichiro Ishihara
摘要： A method for producing a forged crankshaft includes a die forging step of forming a forged blank having a crankshaft shape by die forging, and a pressing step of pressing the forged blank by a first dies. The forged blank includes first excess portions attached to some or all of crank arms each incorporating a counterweight, each of the first excess portions protrudes from a side portion of the crank arm, in a region near a journal. In the pressing step, the first excess portions are deformed by the first dies such that each of the first excess portions bulges toward a pin. This facilitates the production of a forged crankshaft with a reduced weight and assured stiffness.
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公开(公告)号：US10124398B2
公开(公告)日：2018-11-13
申请号：US15031290
申请日：2014-11-20
发明人： Kenji Tamura , Junichi Okubo , Koichiro Ishihara , Ken Yoshino , Kunihiro Yabuno , Hiroyuki Kurokawa , Tomohisa Yamashita , Sho Takamoto
摘要： A method for producing a forged crankshaft includes a die forging step, a trimming step, and an excess projecting portion bending step. The die forging step forms a finish forged blank with flash, the finish forged blank including a shape of the crankshaft, in which crank arms have excess projecting portions at outer peripheries of side portions thereof near a crank pin, the excess projecting portions projecting from the outer peripheries. The trimming step removes the flash from the finish forged blank formed in the die forging step. The excess projecting portion bending step bends the excess projecting portions of the crank arms toward a journal-side surface of the crank arm by pressing the crankshaft using a pair of first dies, the crankshaft being obtained by removing the flash in the trimming step.
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公开(公告)号：US10086425B2
公开(公告)日：2018-10-02
申请号：US15031289
申请日：2014-11-20
发明人： Kenji Tamura , Junichi Okubo , Koichiro Ishihara , Ken Yoshino , Kunihiro Yabuno , Hiroyuki Kurokawa , Tomohisa Yamashita , Sho Takamoto
摘要： A method for producing a forged crankshaft includes a die forging step, a trimming step, and an excess projecting portion crushing step. The die forging step forms a finish forged blank with flash, the finish forged blank including a shape of the crankshaft, in which crank arms have excess projecting portions at outer peripheries of side portions thereof near a crank pin, the excess projecting portions projecting from the outer peripheries. The trimming step removes the flash from the finish forged blank formed in the die forging step. The excess projecting portion crushing step crushes the excess projecting portions of the crank arms by pressing the crankshaft using a pair of first dies, the crankshaft being obtained by removing the flash in the trimming step.
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公开(公告)号：US20160256917A1
公开(公告)日：2016-09-08
申请号：US15031290
申请日：2014-11-20
发明人： Kenji Tamura , Junichi Okubo , Koichiro Ishihara , Ken Yoshino , Kunihiro Yabuno , Hiroyuki Kurokawa , Tomohisa Yamashita , Sho Takamoto
IPC分类号： B21K1/08
CPC分类号： B21K1/08 , B23P15/00 , B23P2700/07 , F16C3/08 , F16C2220/46
摘要： A method for producing a forged crankshaft includes a die forging step, a trimming step, and an excess projecting portion bending step. The die forging step forms a finish forged blank with flash, the finish forged blank including a shape of the crankshaft, in which crank arms have excess projecting portions at outer peripheries of side portions thereof near a crank pin, the excess projecting portions projecting from the outer peripheries. The trimming step removes the flash from the finish forged blank formed in the die forging step. The excess projecting portion bending step bends the excess projecting portions of the crank arms toward a journal-side surface of the crank arm by pressing the crankshaft using a pair of first dies, the crankshaft being obtained by removing the flash in the trimming step.
摘要翻译： 锻造曲轴的制造方法包括模锻步骤，修整步骤和多余的突出部弯曲步骤。 模锻步骤形成具有闪光的精加工的坯件，精加工的坯件包括曲轴的形状，其中曲柄臂在曲柄销附近的侧部的外周具有多余的突出部分，多余的突出部分从 外围。 修整步骤从在锻模步骤中形成的精加工锻造坯料中去除闪光。 多余的突出部弯曲步骤通过使用一对第一模具按压曲轴使曲柄臂的多余的突出部朝向曲柄臂的轴颈侧表面弯曲，曲轴通过在修整步骤中去除闪光而获得。
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