Abstract: An internal combustion engine is provided, which includes an engine body provided with a cylinder and a piston reciprocatably accommodated in the cylinder, a crankshaft that converts reciprocating movement of the piston into rotational movement, and a bearing member pivotally supporting the crankshaft via lubricating oil. The crankshaft includes a crank journal pivotally supported by the bearing member, and a counterweight extending radially outward from an axial end part of the crank journal. The crank journal has a recess formed in a part thereof corresponding to the extended position of the counterweight, the recess being depressed radially inwardly. The recess is deeper at the axial end part of the crank journal than an axial center part.

Abstract: A machining center for machining a center groove on a pulley and a flange formed at opposite ends of a crankshaft of a vehicle includes a measurement unit configured to measure a moment of the crankshaft when the crankshaft is loaded and actuated, a control unit configured to calculate an imbalance amount of the crankshaft and to derive center drill coordinates for removing the imbalance amount, a compensation unit mounted in a base frame and configured to compensate a position of the crankshaft by rotating first and second rotating elements based on the center drill coordinates inputted from the control unit when the crankshaft is transported and clamped by a clamping system, and a machining unit configured to machine the center groove in the pulley and the flange of the crankshaft.

Abstract: The invention relates to a device for the impact treatment of transition radii (8) of a crankshaft (4), in particular transition radii (8) between connecting rod bearing journals (5) and crank webs (7) and/or transition radii (8) between main bearing journals (6) and the crank webs (7) of the crankshaft (4). The device comprises an impact device (1) in order to introduce an impact force (FS) into at least one transition radius (8), wherein the impact device (1) has multiple impact heads (21) which are paired with the same transition radius (8).

Abstract: A forged crankshaft manufacturing apparatus processes a forged blank with no flash. The forged blank includes at least one rough crank arm having an excess portion protruding from an outer periphery of a side portion thereof. The manufacturing apparatus includes a first die and a second die paired with each other, a retaining device, and a moving device. The first die and the second die bend or crash the excess portion. The retaining device retains at least one of the rough journals or at least one of the rough pins such that a rough pin decentering direction is perpendicular to a reducing direction in which the first die and the second die apply force for reduction. The moving device supports the retaining device such that the retaining device is movable in the reducing direction.

Abstract: A method for manufacturing a bicycle crank is revealed. After being extended, bent and forged, an aluminum alloy pipe becomes an L-shaped part formed by a cylindrical crankshaft portion and an oval crank portion integrally connected to each other. A plug is inserted into an outer end of the crank portion while a periphery of an outer end of the crankshaft portion is punched to form a shaft-connecting portion. An assembling hole is arranged at the outer end of the crank portion, corresponding to the plug. Thus a bicycle crank is produced. Thereby not only the assembly of the bicycle crank is easier and more convenient, the structural strength of the bicycle crank is increased effectively to against vibrations and impacts. The bicycle is lightweight and the bicycle crank is more streamlined so that consumers are attracted. Thereby the market competitiveness is increased.

Abstract: A crankshaft for a reciprocating piston engine is disclosed. The crankshaft has at least two shaft journals adjoined by respective crank webs which are connected to one another by an associated crank pin. Respective material accumulations, which in each case have a surface oriented at least substantially orthogonally with respect to the axis of rotation, are provided on the crank webs in the region of the axis of rotation.

Abstract: A forged crankshaft assembly for an engine, and a method of manufacturing the same, has a forged crankshaft and a removable counterweight to provide access for core drilling or milling a cavity. The forged crankshaft has a pin bearing journal, a main bearing journal, a first crank arm supporting the pin bearing journal, a second crank arm supporting the pin bearing journal and connecting the pin bearing journal and the main bearing journal, and at least one milled crank arm cavity formed within at least a portion of the second crank arm. The removable counterweight extends radially outward from the first crank arm, wherein the crank arm cavity is configured to be accessible to a core drill or mill cutter only when the removable counterweight is removed from the first crank arm and inaccessible to the core drill or mill cutter when the removable counterweight is coupled to the first crank arm.

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 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 method for assembling a camshaft from a support shaft and components to be connected to the support shaft, the components having through-openings for receiving the support shaft. In this method, a support shaft is provided, having first diametrical enlargements in first regions, in which the components are to be secured, and second diametrical enlargements in second regions, in which the components are to be pre-positioned. A diameter (D2) in the second regions is smaller than a diameter (D1) in the first regions The support shaft is cooled and/or the components are heated up, so that the support shaft can be pushed with its first and second diametrical enlargements through the through-openings of the components.

Abstract: A bicycle is provided having a unitary steering tube-crown member and a unitary crank arm-spindle member. A multistage aluminum 3D forging process is used to form the unitary members. This may allow the fabrication of components with substantially hollow interior areas to reduce weight, reduce part count while maintaining high strength and ductility. The multistage 3D forging process provided also allows the combination of multiple components into a single unitary part.

Abstract: A method of simultaneously manufacturing a plurality of crankshafts includes positioning a core system having a plurality of individual cores within a cavity of a mold having first and second halves forming an exterior shape of the crankshafts. The crankshafts' exterior shape includes a plurality of pin bearing journals and a plurality of main bearing journals. Each of the cores passes through each of the crankshafts. At least one core passes through at least one of the pin bearing journals and at least one other core passes through at least one of the main bearing journals. The method also includes introducing into the cavity molten metal to form the crankshafts. As the metal flows into the cavity and around the plurality of cores, a hollow section extending through at least one of the pin bearing journals and at least one of the main bearing journals of each crankshaft is formed.

Abstract: A method of fabricating a turbine engine drum including at least two rotor disks, the method including: positioning the two disks on a common axis spaced apart from each other and in a predetermined angular position relative to each other; placing a wall forming a body of revolution between the two disks coaxially about their common axis; driving the wall in rotation about its axis; and moving the disks axially towards the wall so as to put the disks into contact with ends of the wall and thus welding the disks to the wall by inertial friction welding.

Abstract: A crankshaft and method for manufacturing the same are disclosed. The crankshaft may comprise a web and a rod journal disposed adjacent to the web. The rod journal includes a fillet disposed proximal to the web. The fillet includes a tapered undercut having a concave shape with a graduated depth. The undercut is defined by a sweep angle and an offset angle.

Abstract: A method of manufacturing a die forged crankshaft to be mounted in a two or more cylinder reciprocating apparatus includes: an upsetting step that includes upsetting a billet having a constant cross-sectional area along an entire length thereof to form a blank having an enlarged cross-sectional area at a region between a portion to be formed into a leading crank arm of the crankshaft and a portion to be formed into a trailing crank arm thereof; a die forging step that includes die forging the blank formed in the upsetting step to form a forged blank having a shape of the crankshaft with a flash; and a trimming step that includes trimming the flash from the forged blank formed in the die forging step. This makes it possible to improve the material utilization and to use a billet having a cross-sectional size as small as possible.

Abstract: A method for manufacturing a crankshaft with a turning and broaching machine is provided with a temporary setting process, a lifting process, a centering process, and a clamping process. An unprocessed crankshaft is mounted on first and second temporary settings in the temporary setting process. A rear flange is lifted by a first chuck jaws and a front flange is lifted by a second chuck jaws in the lifting process. First and second centers are inserted into first and second center holes in the centering process.

Abstract: In order to shorten a process chain for material removing machining of a crank shaft after rough machining and after hardening a combination of circumferential turn milling as a first step and subsequent dry grinding as a second step is proposed according to the invention.

Abstract: Master and slave pullrods are disclosed in which a master pullrod is coupled to a journal of a crankshaft. The slave pullrod indirectly couples to the crankshaft by coupling to the master pullrod. Such a configuration allows two connecting rods to be coupled to the journal of the crankshaft inline with each other.

Abstract: In a method for increasing the strength of a component subjected to torsional and flexural stress, in particular of a crankshaft, in a first step essentially the entire component is provided with a nitriding layer. In a second step, the nitriding layer is at least partially removed in at least one highly stressed region of the component by means of cutting machining, and, in a third step, the at least one highly stressed component region freed of the nitriding layer is mechanically strain-hardened.

Abstract: In order to prevent a subsequent imbalance of a finished crank shaft a work piece is rotated about an A-axis and a B-axis before introducing aligned centering bore holes (balanced centering) according to the invention instead of transversally offsetting the centering bore holes (geometric balancing) which is known in the art.

Abstract: An apparatus and method are disclosed for transmitting drive between a first and at least one further component. The apparatus includes an elongate shaft element extending along a respective longitudinal axis and comprising a first and further shaft region, each of which comprises a substantially cylindrical outer surface extending from a respective first and further side of a cam body region. The apparatus also includes a fluid communication pathway extending within the shaft element from a first end region of the shaft element to at least one outlet aperture in an outer surface of the first cylindrical region.

Abstract: The invention relates to a method for machining surfaces of the bearing seats of main and pin bearings on crankshafts made of cast steel following the machining of surfaces with an undefined cutting edge by grinding or finishing. The problem of improving the quality of the running surfaces of the bearings of hardened or unhardened crankshafts is solved. This is achieved by irradiating the surfaces with a laser beam.

Abstract: A method of balancing a crankshaft includes connecting a torsion-absorbing pendulum to a cheek of the crankshaft, which is coupled to a crankpin. As the pendulum connected to the cheek has insufficient mass to balance the crankshaft, a lightening bore is formed through a bisection plane of the cheek. In forming the lightening bore, enough material is removed from the cheek so that the mass of the pendulum becomes sufficient to balance the crankshaft.

Abstract: A forging process is conducted in a temperature range of 350-600° C. on at least a portion that is required to have a fatigue strength in an intermediate forged product having a ferrite and pearlite texture obtained by conducting a hot forging on a steel in which N is not greater than an amount at which N is unavoidably dissolved as a solid, thereby improving strength of the portion that is required to have a fatigue strength. With this, there is provided a forged product having a good strength and a low price.

Abstract: A machining device for machining crankshafts has a rotationally driven disk-shaped base body with blade inserts arranged peripherally thereon. A first supply line for a cryogenic cooling medium is arranged concentrically with the axis of rotation and is thermally insulated in at least some sections. The tool has a plurality of second supply lines for the cryogenic cooling medium running across the axis of rotation and leading to the blade inserts, the second supply lines each being thermally insulated in at least some sections. A distributor unit connects the first supply line to at least one of the second supply lines for supplying the cryogenic cooling medium to at least one of the blade inserts. The cryogenic cooling medium can be conducted directly to the blade inserts which are engaged with the crankshaft that is to be machined.

Abstract: A crankshaft including narrow flat shoulders that are located next to a bearing pin at adjacent cheeks of the crankshaft. The narrow flat shoulders are machined by turning a rotary tool. In the process, the crankshaft that is clamped in a fixed manner and rotates about a rotation and clamping axis in which also the centric longitudinal axis formed by centric bearing pins of the crank shaft is located. As a result, the bearing pins rotate with a geometric axis thereof on a circular path about the rotation and clamping axis. The rotary tool tracks the moving bearing pins with regard to the vertical and lateral movement thereof in two movement directions that are perpendicular to each other. As a result, the rotary tool is in consistent lateral engagement with the flat shoulder of the bearing pin.

Abstract: In a crankshaft 200, one hole 213L formed in a crankpin 213 has a bottom surface having a larger area and a depth from a surface of the crankpin less than those of another hole 213M. In forming the hole 213L and the hole 213M, a preformed product 200 of the crankshaft having a shape smaller than that of a cavity is disposed in a die set and punches are simultaneously inserted into the crankpin 213. By this operation, the hole 213L and the hole 213M are simultaneously formed in each crankpin 213 of the preformed product 200.

Abstract: A machine-plate manufacturing device 30 includes a cylinder section 32 having an outer circumferential portion. A groove into which an engagement portion of the sheet is removably inserted is formed in the outer circumferential portion of the cylinder section 32. On the inner side of the outer circumferential portion of the cylinder section 32, magnetic attraction members 51 formed of a magnetic material are provided, and permanent magnets 53 are provided in such a manner that their orientation can be switched. Permanent-magnet switching means is provided to switch the orientation of the permanent magnets 53 between a magnetization position for magnetizing the magnetic attraction members 51 and a demagnetization position for demagnetizing the magnetic attraction members 51.

Abstract: A crankshaft includes a plurality of crankpins. The crankpins are defined on the crankshaft and are longitudinally spaced apart from each other along a rotational axis. Each of the crankpins is configured to be operatively connected to a piston of an engine including a plurality of cylinders. The engine is configured to deactivate one of the cylinders. At least two of the crankpins are substantially aligned with each other along a pin axis. At least one of the crankpins is rotationally offset from the pin axis in a rotational direction of the crankshaft such that the engine has an even firing order even when one of the cylinders is deactivated.

Abstract: A crankshaft having a crankpin journal, a main journal joined to the crankpin journal by a crank web, is provided. The crankpin journal and the main journal have a hardened surface upto a first pre-determined depth. The crankshaft further includes a crankpin journal fillet joining the crankpin journal and the crank web. The crankpin journal fillet includes a hardened surface strengthened by a peening process. The crankshaft further includes a main journal fillet joining the main journal and the crank web. The main journal fillet includes a hardened surface strengthened by the peening process. The crankshaft also includes an oil passage extending through the crankpin journal and the main journal. The oil passage extends such that a portion of a surface proximate to the oil passage is hardened to a second pre-determined depth.

Abstract: In a crankshaft 200, one hole 213L formed in a crankpin 213 has a bottom surface having a larger area and a depth from a surface of the crankpin less than those of another hole 213M. In forming the hole 213L and the hole 213M, a preformed product 200 of the crankshaft having a shape smaller than that of a cavity is disposed in a die set and punches are simultaneously inserted into the crankpin 213. By this operation, the hole 213L and the hole 213M are simultaneously formed in each crankpin 213 of the preformed product 200.

Abstract: A method of manufacturing a crankshaft comprising providing two parts, each part comprising two webs, a portion of a crank journal and a portion of a main journal, welding the two portions of the crank journal together, heating the crank journal, inserting a shim between the webs, and upset forging to reduce the length of the crank journal to form a forged segment. Alternatively, the portions of the main journal may be welded, heated, shimmed, and forged to form a forged segment. The crankshaft may be lengthened by adding additional parts or forged segments using the same steps. A production line for carrying out this method when producing a crankshaft with n number of crank journals, where n is an even integer.

Abstract: In order to shorten a process chain for chip removing processing of a crank shaft after coarse machining and after hardening according to the invention a combination of turn milling or single point milling is proposed as a first step and a subsequent line machining step through finishing or electro chemical etching is proposed.

Abstract: In order to shorten a process chain during material removing machining of a crank shaft, after rough machining and after hardening according to the invention a combination of single point turning with subsequent tangential turning and/or finishing and/or fine dry grinding and/or electrochemical etching is proposed as a second step.

Abstract: A method for completely machining at least unprocessed centric journals (10) and crankpin journals (11), and the respective flat shoulders (9, 10) thereof surrounding the journals, of flanged or cast blanks of a crankshaft first includes turning the flat shoulders (9) associated with the journals (10). Then, the centric journals (10) are roughly ground without the flat shoulders (9) thereof and the crankpin journals (11) are roughly ground together with the flat shoulders (12) thereof. After the journals (10, 11) have been roughly ground, an allowance remains that is smaller than an allowance required for common finish grinding of journals and flat shoulders. The rough grinding is followed by the finish grinding of the centric journals (10) and the crankpin journals (11) from the smaller allowance (23) remaining due to the rough grinding to the final dimension.

Abstract: A method of balancing a crankshaft includes connecting a torsion-absorbing pendulum to a cheek of the crankshaft, which is coupled to a crankpin. As the pendulum connected to the cheek has insufficient mass to balance the crankshaft, a lightening bore is formed through a bisection plane of the cheek. In forming the lightening bore, enough material is removed from the cheek so that the mass of the pendulum becomes sufficient to balance the crankshaft.

Abstract: A counterweight mounted to a drive shaft in a scroll compressor is provided. The drive shaft has a central annular segment generally concentric about the central axis and an eccentric annular segment offset from the central axis that can be used for driving the movable scroll compressor body. A counterweight engages the eccentric and also engages the annular segment for location and mounting of the counterweight to the shaft.

Abstract: The invention relates to a crankshaft comprising at least: a journal; a first crankpin; a second crankpin; a first arm connecting the first crankpin to the journal; a second arm connecting the second crankpin to the journal; a first pipe extending away from the first crank pin toward the journal and leading onto the surface of the first crankpin on the transverse median plane thereof, and substantially passing to the center of the median plane of the second arm; and a second conduit extending away from the second crankpin toward the journal and leading onto the surface of the second crankpin on the transverse median plane thereof, and substantially passing to the center of the median plane of the second arm, characterized in that the shape of the crankshaft is such that it cannot also comprise a diametric pipe within the transverse median plane of the journal fluidly adjoining the first pipe and the second pipe, and the crankshaft comprises a third non-diametric pipe within the transverse median plan of the j

Abstract: A forged crankshaft includes a plurality of main journals, a plurality of crank pin journals rotatable in a circular path about axes defined by the main journals, and a plurality of crank webs. At least one crank web of the plurality of crank webs defines a middle crank web which is located between and connects two neighboring crank pin journals of the plurality of crank pin journals. The middle crank web has a stress relief forged therein, which is defined by first and second spaced sidewalls, an inner wall and a base wall. The forged-in stress relief has a predetermined depth, wrap angle, radius, and undercut which together define a shape of the forged-in stress relief. The shape of the forged-in stress relief is controlled to reduce stress in the crankshaft.

Abstract: A crankshaft is cast in a mold to define a plurality of pin bearing journals and a plurality of main bearing journals, at least one of each has a hollow section extending therethrough. A single core is positioned within the mold to form all of the hollow sections. The single core may include a cross-section defining an elliptical shape to form hollow sections having an elliptical cross-sectional shape to further reduce the weight of the crankshaft. The hollow sections are each positioned along a path that minimizes stress within the crankshaft. The path may include a non-linear path relative to a longitudinal axis of the crankshaft or a linear path angled relative to the longitudinal axis to bend or direct the hollow sections away from high stress regions of the crankshaft. The non-circular cross section of the core may spiral about its own axis to maximize mass reduction.

Abstract: In a crankshaft 200, one hole 213L formed in a crankpin 213 has a bottom surface having a larger area and a depth from a surface of the crankpin less than those of another hole 213M. In forming the hole 213L and the hole 213M, a preformed product 200 of the crankshaft having a shape smaller than that of a cavity is disposed in a die set and punches are simultaneously inserted into the crankpin 213. By this operation, the hole 213L and the hole 213M are simultaneously formed in each crankpin 213 of the preformed product 200.

Abstract: A machine which comprises two machining heads (1, 2) designed to machine crankshaft (5) ends and two machining stations (3, 4) designed to receive and secure at least one crankshaft (5). The machining stations (3, 4) are disposed between the two machining heads (1, 2). The crankshafts (5) are mounted in such a manner as to be disposed parallel to each other and oriented at 180°.

Abstract: In a crankshaft 200, one hole 213L formed in a crankpin 213 has a bottom surface having a larger area and a depth from a surface of the crankpin less than those of another hole 213M. In forming the hole 213L and the hole 213M, a preformed product 200 of the crankshaft having a shape smaller than that of a cavity is disposed in a die set and punches are simultaneously inserted into the crankpin 213. By this operation, the hole 213L and the hole 213M are simultaneously formed in each crankpin 213 of the preformed product 200.

Abstract: The present invention provides a production apparatus for crankshaft, including: a die which has a lower die, an upper die, and plural side forming punches, the upper die being provided movably to the lower die, the side forming punches moving perpendicularly to a movement direction of the upper die; a press ram which moves the upper die to the lower die, closes a material of the crankshaft, and forms the material; cam mechanisms which are provided for the side forming punches and which move the side forming punches to an inside portion of the die in accordance with movement of the press ram; a grade separation structure which is provided to at least one of the side forming punches in order to prevent interference of the side forming punches with each other.

Abstract: A valve lifter including a cylindrical portion, a crown portion having a crown surface, a chamfered portion formed on an outer periphery of the crown portion adjacent to an outer peripheral edge of the crown surface and tapered toward the crown surface, and a hard carbon film covering only the crown surface and the chamfered portion. The chamfered portion has a taper angle with respect to an outer peripheral surface of the cylindrical portion on which the hard carbon film is not formed, the taper angle being set to not more than 26.5°. The chamfered portion has a length extending from on a side of the crown surface toward a side of the cylindrical portion in an axial direction of the cylindrical portion, the length being set to not less than 1 mm.

Abstract: To increase precision in straightness on a journal thrust surface relative to an outer peripheral surface of a journal in a crankshaft, a control system is provided for controlling movement of a cutter in axial directions by running a control program transferred from an automatic programming apparatus. The automatic programming apparatus corrects machining data on the basis of data for correcting the straightness gained through a comparison between results of a measurement of machining dimensions of the journal thrust surface in the workpiece on which a cutting process has been carried out and target machining dimensions for the journal thrust surface. A control program is prepared on the basis of the corrected machining data after correction of the machining data.

Abstract: Technology which enables a first member and a second member to be fastened together strongly is provided. A bar-shaped section is formed on the first member, a hole is formed in the second member, and the bar-shaped section of the first member is pressure fitted into the hole of the second member. Here, the diameter of the circumscribed circle which circumscribes the cross-section perpendicular to the axis of the bar-shaped section is made greater than the diameter of the inscribed circle which inscribes the cross-section perpendicular to the axle of the hole. The diameter of the inscribed circle which inscribes the cross-section perpendicular to the axis of the bar-shaped section is made smaller than the diameter of the circumscribed circle which circumscribes the cross-section perpendicular to the axle of the hole.

Abstract: Technology which enables a first member and a second member to be firmly fastened together is provided. A bar-shaped section is formed on the first member, a hole is formed in the second member, and the bar-shaped section of the first member is pressure fitted into the hole of the second member. Here, peak sections which extend intermittently in the axial direction or peak sections which extend obliquely with respect to the axial direction are formed in a repeating fashion in the circumferential direction, on the side face of the harder of the bar-shaped member and the hole.

Abstract: In a crankshaft 200, one hole 213L formed in a crankpin 213 has a bottom surface having a larger area and a depth from a surface of the crankpin less than those of another hole 213M. In forming the hole 213L and the hole 213M, a preformed product 200 of the crankshaft having a shape smaller than that of a cavity is disposed in a die set and punches are simultaneously inserted into the crankpin 213. By this operation, the hole 213L and the hole 213M are simultaneously formed in each crankpin 213 of the preformed product 200.

Abstract: A preformed product of a crankshaft is formed in a shape smaller than a shape of a cavity of a separatable die set 1103 composed of an upper die and a lower die and is disposed in the cavity of the die set 1103 as a material M. The cavity of the die set 1103 matches a required shape of the crankshaft. When the material M is disposed in the cavity of the die set 1103, a clearance is formed between the material M and the cavity, and when a side-forming punch 1000P is inserted into the material M, a hollow hole is formed in the material M and the cavity is filled with the material M. As a result, not only can weight saving be achieved by forming the hole in the crankpin of the crankshaft, but also degradation of dimensional accuracy by forming the hole can be avoided.