Abstract:
PROBLEM TO BE SOLVED: To provide a gear having a reduced axial length and well improved dedendum strength through shot peening after assembled. SOLUTION: The gear comprises a gear part 10 for increasing/reducing the rotating speed of a rotating shaft with a predetermined gear ratio, a gear body 75a having a positioning protruded part 11 formed integrally with the gear part 10 at a position a predetermined distance S apart from the gear part 10 in the axial direction, and a clutch gear 95 positioned by the protruded part 11 so that at least part thereof is overlapped with a space S between the gear part 10 and the positioning protruded part 11 in the axial direction, and assembled and fixed onto the gear body 75a. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a processing method for a plastic product preventing the generation of burr in the punching part of a cutting tool when a plastic material, a molded product or the like is processed using the cutting tool such as a bite, a fraise or the like. SOLUTION: In the processing method for the plastic product, a processing material wherein the surface part of the plastic product to be subjected to cutting processing is covered with a heat-shrinkable film in an adhesion state is used and the surface part of the processing material covered with the heat- shrinkable film in an adhesion state is processed by the cutting tool and the burr generated in the punching part of the cutting tool is prevented. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To prolong the pitting fatigue life of automotive parts and the like, which are shot peened in order to prolong the dedendum fatigue life, because load surface pressure against a gear is increased along with recent miniaturization, weight reduction, and output power increase. SOLUTION: The gear with the long dedendum life and the contact fatigue life is characterized by including certain contents of components such as Cr and Mo, and having a compressive residual stress of 400 MPa or more on the surface, an incompletely quenched layer of 3 μm or thicker but 15 μm or thinner, coefficient of friction of 0.02 or more but 0.05 or less on the surface, and residual austenite of 10% or less.
Abstract:
A method of machining at least one tooth flank of a gear with a finishing tool. The method comprises rotating the finishing tool, such as a grinding tool, and bringing the tool and the tooth flank into contact. Relative movement between the tool and the gear is provided to traverse the tool across the tooth flank along a path whereby the path produces a tooth flank geometry of a form which, when brought into mesh with a mating tooth flank to form a tooth pair under no load or light load, provides a motion graph curve that intersects, at least two times, a motion graph curve of at least one of an immediately preceding tooth pair and an immediately following tooth pair. The motion graph curve of the tooth pair describes contact between respective tooth flanks of said tooth pair from an initial entrance into mesh to a final exit from mesh as being over a gear rotation amount of greater than 1.0 pitch and preferably, about 1.5 pitch to about 3.0 pitch.
Abstract:
PROBLEM TO BE SOLVED: To prevent die breakage or a shortened die life due to fatigue in a rack molding method for a hollow rack shaft and in a die therefor. SOLUTION: Dies 1 and 2 each have recessed portions 12, so that pads if produced, flows into the recessed portions 12 to form protrusions 13 on a workpiece 4. The flow prevents such excessive force in the dies 1 and 2 as occurs when they are filled with a material. The protrusions 13 pose no drawback to geared transmission.
Abstract:
PURPOSE: To provide a method and machine for manufacturing of gears capable of easily manufacturing the gears with the low cost. CONSTITUTION: A method comprises a process for rotating a gear 2 to be machined about a first rotary shaft 14, a process for positioning a disc tool relative to the gear 2 so that a cutting part around the disc tool 32 is engaged with teeth of a pinion, and a process for rotating the disc tool 32 about a rotary shaft 35a. Further it comprises a process for relatively moving the disc tool 32 and the gear 2 to be machined along a line of action, and a process for inclining the disc tool 32 on a second rotary shaft for changing the inclination to the gear 2. The rotation of the gear 2 about the first rotary shaft 14, the inclination of the disc tool 32 about the second rotary shaft and the relative movement of the disc tool 32 and the gear 2 to be machined along a line of action are synchronously executed.