Hitachi, Ltd.

Hitachi Construction Machinery Co., Ltd.

Kouji Harada

Hisanobu Kanamaru

Masayuki Kobayashi

Shinji Yamazaki

Hiroatsu Tokuda

Ken Ichiryu

Kazuhiko Kawakami

Kazuo Ojima

Morio Tamura

Kiyoshi Tanaka

Nobuyuki Tobita

Masaru Kawai

In order to realize a method of forming a rotor core that improves the productivity and enhances the product accuracy, a forming method of a rotor that is equipped with both permanent-magnet fastener on the inner perimetric end of the magnetic pole claw of the rotor core and tapered surface on the outer perimetric end on one end of the magnetic pole claw in the circumferential direction. By constraining the inner perimetric surface of the magnetic pole claw by a die and applying a forming pressure in the radial direction, the tapered surface on the outer perimetric end of the magnetic pole claw and permanent-magnet fastener on the inner perimetric end can be formed at the same time and a rotor core with high product accuracy and mass-productivity is realized.

Manufacturing method of rotor core

The disclosure is concerned with a bonding method for bonding metallic members, which comprises the steps of: fitting a metallic members to another metallic member, followed by effecting preliminarily plastic bonding by means of a preliminarily bonding punch; and generating compression force in an axial direction of the members in the vicinity of the fitting portion of the bonding members after the preliminarily plastic bonding, and allowing part of the material of the bonding member to effect plastic-flow in such a manner as to fill a gap defined between the metallic members, so as to plastically bond the members; whereby the members are tightly integrated with each other.

Method of bonding metallic members by plastic-flow bonding and plastic-flow bonded body

A heat sink board having a first heat sink and a second heat sink with a smaller linear expansion coefficient than that of the first heat sink and being bonded to the first heat sink to form the heat sink board. The second heat sink is fitted to the first heat sink, and a material of the first heat sink in the vicinity of a boundary between the fitted heat sinks is plastically deformed for close adhesion to the second heat sink. A forming method makes bonding between the first and second heat sinks possible at room temperature, and the heat sink board made of a composite member having a high flat-surface accuracy can be easily and reliably obtained.

Heat sink board and manufacturing method thereof

A outer circumferential part of a body to be coupled having an annular groove formed in the outer periphery of a shaft is press-fitted into the inner circumferential part of a coupling hole in the central portion of a hub , the vicinity of the hole in the end of the hub is plastic-deformed over the whole periphery, and material for the hub is caused to plastic-flow so as to bury a recess of the shaft, and to apply compression stress to the shaft, whereby a coupling force between a thin hub and a small diameter shaft is obtained by shearing force and compressing force of the material for the hub.

Press-fit and plastic-flow coupling of a shaft to a hub of a disk device

A seal structure in which a hole (5) is defined by a metal base member (4) as a partition member for partitioning the regions on the opposite sides thereof to a gas tight or liquid tight state and a member passes through the hole (5) and extends therefrom. The member passing through the hole (5) may be an electric conductor (2), a pipe member for flowing gas or liquid, a heat pipe for flowing a heat medium, an optical fiber for transferring an optical signal, or the like, and the structure is arranged such that the member passing through the hole is disposed through a synthetic resin seal member (3) and the hole (5) is sealed based on the confinement effected by the plastic deforming action of the base member (4) and the deforming action of the seal member (3) effected by making use of the elastic plasticity thereof, whereby the structure exhibits an excellent pressure resistive performance and can effectively seal the hole (5).

Seal structure for member-passing-through hole bored in metal partition

A mechanical press includes a slider which is reciprocated, through connecting rods, by an oscillating plate oscillating around a driving shaft to obtain a press load. The press further includes a swash plate rotatable with the driving shaft. The oscillating plate oscillates in accordance with the rotation of the swash plate. A plurality of lock pins are concentrically disposed in parallel with the driving shaft on a side of the oscillating plate opposite to the swash plate. Each of the lock pins has a spherical head housed in the oscillating plate so as to make the pins rotatable and axial movable. A slider guide supports the pins and the slider.

High efficiency, swash plate mechanical press

An axial piston pump apparatus includes a rotary cylinder barrel with plural cylinder bores in each of which a slidable piston is arranged. Each piston is rotatably held at one end with a piston support synchronously rotatable with the cylinder barrel. The piston support rotates in a plane inclined to the cylinder barrel, while each piston reciprocally moves in the corresponding cylinder bore to perform suction/discharging of a fluid. Two of the pistons come into surface contact with the corresponding cylinder bores; and the end of these pistons are held respectively in the piston support for radial movement to serve as drive pins for transmitting torque between the cylinder barrel and the piston support. During operation of the pump apparatus, the one end of each drive piston radially moves in accordance with rotation of the piston support, thereby preventing the drive pistons from inclining to the corresponding cylinder bores and appropriately maintaining surface contact between them. Thus, the two of the pistons serve as drive pins. This obviates the necessity of any separate drive mechanism and hence enables the reduction in size of the pump. Moreover, the drive pistons are kept is surface contact with the cylinder bores without impinging thereon thereby reducing noise and vibration of the pump apparatus.

Axial piston pump apparatus with an improved drive mechanism

A universal joint comprising, first and second rotating members each having a rotating axis, and arranged end to end with a distance therebetween. A guide pin is providing having a spherical portion at one end thereof and rotatably and swingably held by the first member at the rotating axis. The other end of the guide pin is slidably inserted in the second member along the rotating axis, and a pair of driving pins are arranged symmetrically with respect to the guide pin, and each having one end swingably and radially slidably held by the first member and the other end inserted in the second member, one end of each the driving pin being slidable axially.

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Katsuta, Japan

Kouji Harada