Otics Corporation

Toyota Jidosha Kabushiki Kaisha

Tetsuya Niwa

Tomoyuki Isogai

Akira Sugiura

Katsutoshi Kitagawa

Tomiyasu Hirano

Tamotsu Yamamoto

Tomoki Miyoshi

Ryu Osuka

A compressor housing for a turbocharger dividably composed of a plurality of pieces including a scroll piece, and a shroud piece. The scroll piece and the shroud piece are assembled to each other by press-fitting a press-fitting portion of the shroud piece into a press-fitted portion of the scroll piece. Pressure-contacting portions that are provided on either one of the scroll piece and the shroud piece are pressure-contacted with pressure-contacted portions that are provided on the other one of the scroll piece and the shroud piece, respectively. As a result, the pressure-contacting portions plastically flow to form seal parts for sealing the scroll piece and the shroud piece, respectively.

Compressor housing for turbocharger and method for manufacturing the same

A compressor housing for a turbocharger dividably composed of a plurality of pieces including a scroll piece and a shroud piece. The scroll piece and the shroud piece are assembled to each other by press-fitting a press-fitting portion of the shroud piece into a press-fitted portion of the scroll piece in an axial direction. A pressure-contacting portion provided on either one of the scroll piece and the shroud piece is pressure-contacted with a pressure-contacted portion provided on the other one of the scroll piece and the shroud piece in the axial direction to thereby cause plastic flow to both portions, so that a plastic flow portion is annularly formed. Thus, the scroll piece and the shroud piece are sealed to each other.

A compressor housing for a turbocharger, which is composed of a scroll piece, a shroud piece, and an outer-circumferential annular piece. The scroll piece includes a through part constituting a discharge port, a first intermediate wall surface extended from an intake-side wall surface of a scroll chamber and smoothly connected with the discharge port, and a scroll outer-circumferential part. The outer-circumferential annular piece includes an outer-circumferential annular press-fit part press fitted into the scroll outer-circumferential part, and a protruding part bent from an outer-circumference-side wall surface of the scroll chamber. The protruding part is inserted into the through part to form an inner wall surface of an intermediate part that communicates the discharge port with the scroll chamber. Then, the compressor housing is fixed to a center housing that is made of iron with high rigidity through joining parts provided at the scroll piece.

A housing for a turbocharger that makes it possible to prevent sticking of deposit and attain satisfactory assembling workability and easy moldability by die casting. The housing dividably includes a scroll piece and a shroud piece, including an annular refrigerant flow path defined by a first flow-path formation part of the scroll piece and a second flow-path formation part of the shroud piece. The first and second flow path formation parts are fitted with each other at inner and outer circumferential seal parts for sealing the refrigerant flow path on inner and outer circumferential sides thereof. The inner circumferential seal part is formed by press-fitting a first press-fitting portion of the shroud piece into a first press-fitted portion of the scroll piece. The outer circumferential seal part is formed by press-fitting a second press-fitting portion of the shroud piece into a second press-fitted portion of the scroll piece.

Housing for turbocharger and method for manufacturing the same

A compressor structure for turbochargersincluding a scroll piece, a shroud pieceand a seal plateassembled with each other in an axial direction, wherein the scroll pieceincludes a penetration partpenetrating in the axial direction so as to constitute a discharge portand a first intermediate wall surfacesmoothly extending from an intake-side wall surfaceto the discharge port, the shroud pieceincludes an inner circumferential side wall surface, and the seal plateincludes a protruding partprovided with a second intermediate wall surfaceextending from an outer circumferential side wall surfaceand facing the first intermediate wall surfaceso as to constitute an inner wall surfaceof an intermediate partthrough which the discharge portand the scroll chamberare communicated with each other.

Compressor structure for turbochargers

A turbochargerincludes a compressor housingand a bearing housing. The compressor housinghas a shroud surfaceand a diffuser surface. The bearing housinghas an opposite surfacefacing the diffuser surface. An adhesion preventing partis provided on at least one of the diffuser surfaceand the opposite surface. The turbochargeris configured so that compressed air spouts out from the adhesion preventing partto the diffuser passageby an ejector effect caused when compressed air passes through the diffuser passage

Turbocharger

The present invention provides a variable valve operating mechanism which includes two valve operating members for opening and closing two valves individually, a drive cam provided on a single camshaft, two swing arms for transmitting a power of the drive cam to the valve operating members individually by swinging about a different axis to the camshaft, and a variable device for modifying a displacement of the swing arm per rotation of the drive cam in accordance with an operating condition of an internal combustion engine. The variable device includes a single control shaft, an actuator for driving the control shaft, and a cam device that operates in conjunction with the control shaft to dissimilate the displacement of the two swing arms.

Variable valve operating mechanism

The present invention provides a variable valve mechanism which includes a rotating cam provided on a camshaft, a swing arm that contacts with the rotating cam to swing, a drive arm that drives a valve in conjunction with the swing arm, a variable arm that turns the drive arm around a swing axis of the swing arm, an actuator that drives the variable arm, and cam device that is provided between the swing arm and the drive arm. The variable arm is provided so as to be able to rotate relatively around the same axis as the swing arm, and the cam device changes the initial position of the drive arm with respect to the swing arm accompanying the turning of the drive arm.

Growing community of inventors

Aichi, Japan

Tetsuya Niwa