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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：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：US10413965B2
公开(公告)日：2019-09-17
申请号：US15560534
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 rough forging step of performing die forging to obtain a rough forged blank with flash having a crankshaft shape, and a finish forging step of applying die forging by use of a first pair of dies to the rough forged blank to obtain a finish forged blank with flash. In the rough 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. During the die forging in the finish forging step, the first excess portion is deformed by the first pair of dies to bulge toward an adjacent rough journal.
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公开(公告)号：US10385912B2
公开(公告)日：2019-08-20
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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公开(公告)号：US10385911B2
公开(公告)日：2019-08-20
申请号：US15325114
申请日：2015-07-14
发明人： Koichiro Ishihara , Ken Yoshino
摘要： When each of the crank arms is divided by the crank arm centerline-into a right arm portion and a left arm portion, an area moment of inertia of one of the right and the left arm portions that is in a side that is subjected to the maximum load is greater than an area moment of inertia of the other arm portion that is in a side opposite to the side that is subjected to the maximum load, and, the area moment of inertia of the arm portion that is in the side opposite to the side that is subjected to the maximum load is greater than the area moment of inertia of the arm portion that is in the side that is subjected to the maximum load.
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公开(公告)号：US10350671B2
公开(公告)日：2019-07-16
申请号：US15325101
申请日：2015-07-09
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 preforming step of forming a preformed blank with no flash, the preformed blank including a shape of the crankshaft, wherein the crank arm have excess projecting portions at an outer peripheries of side portions of the crank arm near the crank pin; a die forging step of forming a forged blank with flash by pressing the preformed blank with a pair of first dies; and a trimming step of removing the flash from the forged blank. In the die forging step, while a second die is abutted against a journal-side surface of the crank arm and holds the surface, the excess projecting portions of the crank arm are deformed by the first dies so as to increase the side portions of the crank arm in thickness.
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公开(公告)号：US10247226B2
公开(公告)日：2019-04-02
申请号：US15735496
申请日：2016-06-06
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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