Hitachi, Ltd.

Kazushi Sasaya

Hisanobu Kanamaru

Tomiyasu Onuma

Akira Tohkairin

Atsushi Suginuma

Noriharu Sato

Takashi Degawa

Masaharu Okazaki

A joint structure for bonding a ball portion and a shaft portion, with the ball including a mounting hole bored toward a center thereof. A corrugated surface for effecting the bonding is formed in an inner circumferential surface of the mounting hole. A shaft portion, of a softer material than the ball portion, is fitted into the mounting hole of the ball portion. An outer circumferential portion of the shaft portion is plastically locally deformed in the vicinity of a corrugated surface of the mounting hole with the ball portion and the shaft portion being are bonded to each other with a tightening force.

Joint having ball and shaft coupled through plastic deformation

A gas compressor has a cup-like casing. A driving shaft is rotatably carried by a bottom of the casing and has a rotary plate secured thereto. A driven shaft is disposed in the casing at an inclination angle of 20.degree. against the driving shaft, supported by a bearing provided on an end of the driving shaft, and driven by the driving shaft. A cylinder block is fixed to the driven shaft and has a cylinder bores receiving pistons coupled with the rotary plate so that the pistons reciprocate in the cylinder bores upon rotation of the driving shaft. A side plate is secured to an open end of said casing and has a bore receiving a bearing for supporting one end of the driven shaft. The bore is formed in the inside the side plate which projects outside, so that a distance between the bearing of the driving shaft and the bearing in the bore is extended and stable.

Gas compressor

A fluid machine comprises a cylinder block mounted on a rotary shaft, a rotary plate an axis of which is intersecting with an axis of the rotary shaft by an acute angle, a gear engaging mechanism for engaging the rotary plate with the rotary shaft to cyclically rotate the same, a piston supported by the rotary plate and inserted into a throughhole provided in the cylinder block a suction system and a delivery system for effecting suction and delivery operation by a rotation of the cylinder block and the piston, a spherical contact portion disposed between the rotary plate and the rotary shaft and adapted to receive thrust generated between the same, and a passage for leading to the spherical contact portion a high-pressure working gas including lubricating oil generated in the delivery system.

Fluid machine

A swash plate type compressor including a partition plate mounted in a side cover for axially partitioning the interior of the side cover into two portions. One of said two portions interposed between the partition plate and a valve plate functions as a high pressure chamber, and the other portion interposed between the partition wall and a bottom wall surface of the cover functions as a silencing chamber. A compressed refrigerant discharged from cylinder bores and introduced into the high pressure chamber is discharged from the high pressure chamber through the partition plate into the silencing chamber where pulsations of pressure are removed from the refrigerant. By directing the compressed refrigerant discharged from the high pressure chamber toward the center of the silencing chamber and by drawing off the refrigerant from the center of the silencing chamber and introducing same into the refrigerant cycle, increased effects can be achieved in silencing noises.

Growing community of inventors

Katsuta, Japan

Kazushi Sasaya