Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A frame structure of a vehicle has: a frame member that is formed in a closed cross-sectional shape having plural first wall portions and plural first corner portions, and that configures a frame of a vehicle; and a reinforcing member that is made of a fiber reinforced resin, and that is formed in a closed cross-sectional shape having plural second wall portions and plural second corner portions, and that is disposed within the closed cross-sectional shape of the frame member such that the plural second corner portions contact the plural first wall portions or the plural first corner portions respectively, the plural second wall portions facing the plural first wall portions or the plural first corner portions respectively, forming plural closed cross-sectional shapes.

Abstract: An occurrence of thermal distortion when heterogenous materials are joined together is suppressed. Provided is a joining structure that includes a first member, a second member, a rivet and a resin-filled portion. The first member is formed of a first material. The second member is formed of a second material that is different from the first material. The rivet penetrates through at least the first member and joins the first member and second member together. The resin-filled portion is provided around the rivet at a side of the first member at which the second member is disposed. The resin-filled portion is formed by at least one of the first member and the second member and forms a gap between the first member and the second member. A resin member is disposed inside the resin-filled portion.

Abstract: A vehicle framework reinforcement structure includes: a joining member in a tubular shape with a bottom that is mounted to a vehicle main body, including a floor wall that includes plural slit portions; a vehicle framework member that is inserted into the joining member, an outer wall face of the vehicle framework member being welded to an opening end portion of the joining member, and the vehicle framework member being configured such that portions of an end face thereof are exposed through the slit portions; plural projection portions formed along the plural slit portions, the projection portions contacting an inner wall face of the vehicle framework member; and plural weld portions, the portions of the end face of the vehicle framework member that are exposed through the slit portions being welded to the joining member at the weld portions, and the weld portions including welding of the projection portions.

Abstract: A work machine provided with a lifting magnet includes the lifting magnet, an arm that supports the lifting magnet, a boom that supports the arm, an upper turning body that supports the boom, an engine, a selective catalytic reduction system, and a controller that controls attraction and release by the lifting magnet.

Abstract: 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.

Abstract: A joining structure of vehicle framework members includes: a first vehicle framework member formed by a lightweight metal material having a rectangular closed cross section shape in a sectional view orthogonal to an extension direction of the first vehicle framework member; a second vehicle framework member formed by a lightweight metal material having a hat shape in the sectional view orthogonal to the extension direction, the second vehicle framework member covering the first vehicle framework member; an offset flange portion that is a portion of a flange portion formed at an end portion at the opening side of the second vehicle framework member, and that protrudes to an opposite side of the flange portion from the opening side; and a protrusion portion that protrudes from an end portion of the offset flange portion at the opening side, and that is joined to the first vehicle framework member by heat-welding.

Abstract: The present invention provides a joint structure having: a first panel comprising a first material; a second panel comprising a metal material different from the first material; a rivet having a head portion that is placed in contact with the first panel, a shaft portion that is passed through the first panel, and a joint portion that is disposed on the shaft portion side and is in contact with and joined by welding to the second panel; and a sandwiching portion that is disposed at the rivet and sandwiches between itself and the head portion the first panel from the second panel side.

Abstract: A framework structure for a vehicle includes a first frame member that configures part of a framework of the vehicle, a second frame member that is joined to the first frame member to thereby configure the framework having a closed cross-sectional structure, a first reinforcement member made of fiber-reinforced resin that has an engagement portion and is joined to an inner side of the first frame member, and a second reinforcement member made of fiber-reinforced resin that has an engaging portion, and is joined to an inner side of the second frame member. The engaging portion is engaged with the engagement portion, and the second reinforcement member configures, with the first reinforcement member, a reinforcement member having a closed cross-sectional structure.

Abstract: A vehicle framework reinforcement structure includes: a joining member in a tubular shape with a bottom that is mounted to a vehicle main body, including a floor wall that includes plural slit portions; a vehicle framework member that is inserted into the joining member, an outer wall face of the vehicle framework member being welded to an opening end portion of the joining member, and the vehicle framework member being configured such that portions of an end face thereof are exposed through the slit portions; plural projection portions formed along the plural slit portions, the projection portions contacting an inner wall face of the vehicle framework member; and plural weld portions, the portions of the end face of the vehicle framework member that are exposed through the slit portions being welded to the joining member at the weld portions, and the weld portions including welding of the projection portions.

Abstract: A vehicle framework member is provided with a framework member, a reinforcing member and a connecting plate. The framework member has a closed cross section structure including plural wall portions structuring a framework of a vehicle. The framework member includes an inflection portion that is inflected at a portion partway along a length direction. The reinforcing member is fabricated of fiber-reinforced resin and includes a pair of side walls formed in inflected flat plate shapes along the inflection portion. The reinforcing member is disposed in the closed cross section structure at the inflection portion of the framework member. The connecting plate connects the pair of side walls of the reinforcing member and connects a compression deformation side wall portion of the inflection portion with an extension deformation side wall portion of the inflection portion.

Abstract: 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.

Abstract: A frame structure of a vehicle, including a frame member with a closed cross-section structure including plural wall portions configuring the frame, and a reinforcement member made of a fiber reinforced plastic and provided to an inner portion of the closed cross-section structure of the frame member. The reinforcement member includes a fan shaped longitudinal wall portion, and a bottom wall portion from which the longitudinal wall portion protrudes out, and the bottom wall portion joins one end portion and another end portion of an arc of the longitudinal wall portion that are oriented in a row along a length direction of the frame member to an inner face of a wall portion at a compression deformation side of the frame member that undergoes bending deformation due to the front side member being input with load.

Abstract: 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.

Abstract: 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.

Abstract: A frame structure of a vehicle has: a frame member that is formed in a closed cross-sectional shape having plural first wall portions and plural first corner portions, and that configures a frame of a vehicle; and a reinforcing member that is made of a fiber reinforced resin, and that is formed in a closed cross-sectional shape having plural second wall portions and plural second corner portions, and that is disposed within the closed cross-sectional shape of the frame member such that the plural second corner portions contact the plural first wall portions or the plural first corner portions respectively, the plural second wall portions facing the plural first wall portions or the plural first corner portions respectively, forming plural closed cross-sectional shapes.

Abstract: A framework structure for a vehicle includes a first frame member that configures part of a framework of the vehicle, a second frame member that is joined to the first frame member to thereby configure the framework having a closed cross-sectional structure, a first reinforcement member made of fiber-reinforced resin that has an engagement portion and is joined to an inner side of the first frame member, and a second reinforcement member made of fiber-reinforced resin that has an engaging portion, and is joined to an inner side of the second frame member. The engaging portion is engaged with the engagement portion, and the second reinforcement member configures, with the first reinforcement member, a reinforcement member having a closed cross-sectional structure.

Abstract: A vehicle body structure includes: a side member that is disposed running along a vehicle front-rear direction; an upper member that, when viewed along the vehicle width direction, is disposed running along the vehicle front-rear direction at a vehicle upper side of the side member, and comprises a vehicle front-rear direction outside end portion that is positioned at a different position in a vehicle up-down direction from a position in the vehicle up-down direction of a vehicle front-rear direction outside end portion of the side member; a coupling member that couples the vehicle front-rear direction outside end portion of the upper member and the vehicle front-rear direction outside end portion of the side member; and a crash box that comprises a vehicle front-rear direction inside end portion that is joined to the coupling member.