Sumitomo Electric Sintered Alloy, Ltd.

Sumitomo Electric Industries, Limited

Masato Uozumi

Koji Yamaguchi

Atsushi Sato

Kazushi Kusawake

Kentaro Yoshida

Toshiyuki Kosuge

Harumitsu Sasaki

Yosuke Kimura

Makoto Nakabayashi

Kazuo Nakamae

Eiichi Kobayashi

Kazuaki Ikeda

Shinichi Hirono

Shoichi Takada

Mamoru Ono

Hiroyuki Murase

Yuichirou Egami

A crosslinked fluororesin-coated rotor manufacturing method is a method for manufacturing an annular outer rotor of an internal gear pump including the outer rotor, and an inner rotor, a side surfaces of the outer rotor being coated with a crosslinked fluororesin, an inner peripheral surface of the outer rotor not being coated with the crosslinked fluororesin, the method including: using an outer masking jig for covering the inner peripheral surface in a state where the side surfaces of the outer rotor are exposed; coating the outer rotor with an uncrosslinked fluororesin in a state where the outer masking jig is mounted to the outer rotor; and then irradiating the fluororesin with radiation in a state where the outer masking jig is removed from the outer rotor, to crosslink the fluororesin.

Crosslinked fluororesin-coated rotor manufacturing method

It is an object of the present invention to provide a joined component in which the overflow of brazing filler metal from the outer peripheral line of a joint boundary surface between a first member and a second member is suppressed, and a method for manufacturing the joined component. A joined component is obtained by joining, with brazing filler metal, a first member and a second member to each other at a joint boundary surface where the first member and the second member are in contact with each other, the joined component having a non-contact area that is provided on an inner side with respect to an outer peripheral line of the joint boundary surface and in which the first member and the second member are not in contact with each other. In the joined component, the first member has a retaining recess where the brazing filler metal that is melted when the first member and the second member are joined to each other is retained, the retaining recess providing the non-contact area. The molten brazing filler metal including some solidified part forms a brazing-filler-metal pool in the retaining recess.

Joined component and method for manufacturing joined component

The invention is directed to a method of manufacturing a green compact. The method includes a filling step of filling a compacting space with an insulated coated soft magnetic powder. The compacting space is defined by a die. The die has a through hole with which a part of the outer circumferential surface of the green compact is molded. The die also has a core rod with which another part of the outer circumferential surface of the green compact is molded, and a first punch disposed so as to cover one of opening portions of the through hole, the core rod being inserted and disposed in a space of the through hole. The method also includes a pressurizing step using the first punch and a second punch disposed so as to face the first punch. The method also includes a removing step.

Method of manufacturing a green compact

Provided is a jointed component (A) in which a first member () and a second member () in which a pillar () stands erect on a surface of a base () are fixed to each other, the second member. The jointed component includes the first member and the second member including the base and the pillar disposed on the first surface of the base. The pillar is brought into contact with the first member in an axial direction. The second member includes a positioning surface () that has a height difference from an end surface of the second member in the axial direction and the second member includes a curved surface at a ridge between the positioning surface and a side surface of the pillar.

Jointed component, method for manufacturing the same, and compacting die assembly

Provided is a stepped die which includes: an inner ring having a cylindrical shape, and an outer ring having a cylindrical shape which is fitted on an outer periphery of the inner ring by shrinkage fitting, in which a recessed portion for molding which has a stepped portion is formed on an inner side of the inner ring. A shrinkage fitting ratio of the outer ring to the inner ring is set to a value which falls within a range of from 0.12% to 0.25%.

Stepped die

A low-loss compact and a method for producing the compact are provided. A method for producing a compact by using coated soft magnetic powder that includes coated soft magnetic particles constituted by soft magnetic particles and insulating coatings coating outer peripheries of the soft magnetic particles includes a raw material preparation step and an irradiation step. In the raw material preparation step, a raw compact is prepared by press-forming coated soft magnetic powder. In the irradiation step, part of a surface of the raw compact is irradiated with a laser. Irradiating a part of a surface of a raw compact with laser increases the number of disrupted portions of conductive portions where constituent materials of the soft magnetic particles at the surface of the raw compact have become conductive to each other, and the loss of the compact can be decreased.

Compact, method for producing compact

An internal gear pump includes a pump rotor () in which a meshing point between an inner rotor () having n teeth and an outer rotor () having (n+1) teeth is located rearward, in a rotational direction of the rotor, relative to an eccentric axis (CL) along which a center (O) of the inner rotor and a center (O) of the outer rotor are disposed. A tooth-surface curve of the outer rotor () near a meshing section thereof is formed by duplicating thereto a tooth-surface shape of the inner rotor () near a meshing section thereof.

Internal gear pump

The present invention relates to a method for molding a powder mold product according to which a powder mold product of uniform quality can be molded with excellent productivity. The present invention includes the steps of: preparing raw material powder(a preparing step); interposing a mold assembly-use lubricant between an outer circumferential faceof a first punch (a lower punch) and an inner circumferential faceof a die, the lower punchand the diein this state being relatively shifted to apply the mold assembly-use lubricant to the inner circumferential faceof the die(an applying step); and packing the raw material powderinto a cavity, a powder mold productbeing molded by the raw material powderbeing pressed (a molding step). In the applying step, while the mold assembly-use lubricant is discharged from a supply portprovided to the lower punchand the discharged mold assembly-use lubricant is collected from a drain portprovided to the lower punch, the mold assembly-use lubricant is applied to the inner circumferential faceof the die

Method for molding powder mold product

A compactis obtained by compression-molding coated soft magnetic particles covered with insulating coatings, and is a modified frustum body having, as a main body, a frustum portionsandwiched between plate-shaped portionsandarranged in opposing relation. A vertical cross-section of the compactis made up of a trapezoidal surface, a long-side rectangular surfacejoining to a long side of the trapezoidal surface, and a short-side rectangular surfacejoining to a short side of the trapezoidal surface

Compact

In an internal gear pump, a diameter of a base circle is set to A mm, a radius of a rolling circle is set to b mm, a diameter of a locus circle is set to C mm, and an amount of eccentricity is set to e mm. A trochoidal curve T is drawn by rolling the rolling circle along the base circle without slipping and by using a locus of a fixed point distant from a center of the rolling circle by e. A tooth profile of an inner rotorhaving n teeth is formed based on an envelope of a group of the locus circles each having a center on the trochoidal curve T. A pump rotoris formed by combining the inner rotor with an outer rotor having (n+1) teeth. A tooth-profile curve of the inner rotor satisfies the following expression (1). Because K&#x3c;1 is satisfied, cusps s are not formed at opposite edges of each addendum of the inner rotor. 

An internal gear pump includes an inner rotor having n teeth and an outer rotor having (n+1) teeth. A tooth profile of the inner rotor is an envelope of a group of locus circles () each having a diameter C and having a center on a trochoidal curve (T), the trochoidal curve being drawn along a locus of a fixation point, which is located distant from a center of a rolling circle () by e, when the rolling circle () rolls along a base circle () without sliding. A tooth profile of the outer rotor is an envelope of a group of tooth-profile curves of a formation inner rotor, the envelope being obtained by first drawing the formation inner rotor in which a diameter of the locus circle () is equal to C' determined from expression (C&#x2212;t), revolving a center (O) of the formation inner rotor by one lap along a circle (S) having a diameter (2e) and centered on a center (O) of the outer rotor, and rotating the formation inner rotor 1/n times during the revolution.

When an outer core that is to be mounted on a reactor is seen in plan, the outer core is a compact that has a plan-view shape in which a side of the outer core that is opposite to a facing side of the outer core, which faces the inner cores, has a smaller dimension in a width direction, which is parallel to a facing surface, than the facing side of the outer core. A method of manufacturing such an outer core includes a preparing step and a compacting step. In the preparing step, coated soft magnetic powder including multiple coated soft magnetic particles formed by coating soft magnetic particles with insulating coated films is prepared as raw-material powder of the outer core. In the compacting step, a compacting space, which is defined by a pillar-like lower punchand a tubular dieA, is filled with the coated soft magnetic powder and then the coated soft magnetic powder in the compacting spaceis compacted by the lower punchand a pillar-like upper punch, the lower punchand the tubular dieA being movable relative to each other. In the compacting step, the facing surface of the outer core is pressed by the upper punch

Outer core manufacturing method, outer core, and reactor

An object is to meet the demands for increasing the number of teeth of a rotor in an internal gear pump while maintaining a theoretical discharge amount by using an equivalent body configuration so as to enhance the pump performance relating to discharge pulsation due to the increased number of teeth. In a pump rotorformed by combining of an inner rotor () having N teeth and an outer rotor () having (N+1) teeth and disposing the rotors eccentrically relative to each other, the relational expression &#x3c6;D&#x3c;1.7&#xb7;sin(&#x3c0;/180)/sin {&#x3c0;/(180&#xb7;)} is satisfied, &#x3c6;Dbeing a maximum value of a working pitch diameter of the inner rotor () and the outer rotor (), and a working position (G) of the inner rotor () and the outer rotor () is always located rearward of an eccentric axis (CL) in a rotating direction of the rotor.

Pump rotor combining and eccentrically disposing an inner and outer rotor

A gear pump rotor is provided including a combination of an inner rotor and an outer rotor whose numbers of teeth are different by one, and the discharge amount of the pump is increased by an increase of the tooth depth. At least one of an addendum curve and a dedendum curve of an inner rotor is formed by a locus of one point on formation circles that satisfy moving conditions that the formation circles move from moving start points to moving end points while changing the distances from an inner rotor center to the centers of the formation circles. The centers of the formation circles move by a distance in the radial direction of a base circle, and the formation circles rotate by an angle at a constant angular velocity in the same directions of the moving directions of the formation circles.

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Itami, Japan

Masato Uozumi