Denso Corporation

Nippondenso Co., Ltd.

Hisashi Kobayashi

Tetuo Ohno

Yasuo Abe

Masami Niimi

Yasutoshi Yamanaka

Kazutaka Suzuki

Kazuhiro Mitsukawa

Taichi Asano

Yoshitaka Kuroda

Yuji Ogawa

Kenichi Kachi

Shoji Iriyama

Hiroyuki Dekita

Takahiro Nozaki

Toshihide Takeuchi

Sachiyo Tsuda

Yoshinobu Matuzaki

Takashi Kono

Yosimitu Yamaguchi

Sachi Onaga

Yoshinori Sakimoto

A fin according to the present disclosure is a corrugated fin formed of a metal plate by bending into a corrugated shape, and the corrugated fin includes peak portions extending in a first direction, valley portions extending in the first direction, and inclined portions connecting the peak portions and the valley portions adjacent to each other. The peak portions and the valley portions are alternately arranged in a second direction perpendicular to the first direction, and a thickness of the metal plate at each apex of the peak portions and the valley portions is larger than a thickness of the inclined portions of the metal plate.

Fin, heat exchanger with fin, and method of manufacturing fin

The wall thickness of at least a portion, which is plastically deformed, of a protruding portion used for calking is reduced to less than that of the other portions. Due to the foregoing, the bending rigidity of the protruding portion is decreased. Therefore, it is possible to bend (plastically deform) the protruding portion by a relatively low-intensity force. Accordingly, it is possible to easily execute the calking work (calking process) without the need to extend the length of the protruding portion (length from a forward end of the protruding portion to a bent portion). As a result, even if the pressure-withstanding property of an inter-cooler is enhanced by increasing the wall thickness of core plates, it is possible to prevent the calking workability from deteriorating and without increasing the size of the inter-cooler.

Heat exchanger

One end of a metallic wire having a rectangular cross-section is widened by upsetting the end of the wire in its axial direction. At the same time, a swollen portion is formed at a position where the widened end portion is to be bent from a straight portion of the wire. Then, the widened end portion is bent at the bending position having the swollen portion. Thus, a metallic wire segment having the widened end portion bent at the bending position is manufactured without wasting any part of wire material, while avoiding formation of cracks on the outer surface of the bending position. Plural wire segments thus manufactured are combined to form a rotor winding of a rotational electric machine, forming a commutator surface by the widened end portions at the same time.

Method of manufacturing metallic wire segment

A metallic corrugated plate applying to a cooling inner fin of a heat exchanger, wherein a bending angle .THETA. of an end bent ridge portion is smaller than bending angle .theta. of the other bent ridge portions. Thus, in case the bending angle .THETA. becomes large by a resilient force after forming the bent ridge portions, preventing a bending rigidity of the end bent ridge portion in the spreading direction from being reduced is possible. Accordingly, preventing the inner fin from being warped from substantially the center ridge of the bent ridge portion is attained.

Method of manufacturing a corrugated plate by rolling for use as an

According to the present invention, a roll forming method includes a first roll forming process for forming a trapezoidal projecting portion at a center portion, a second roll forming process for gradually narrowing an upper side of the trapezoidal projecting portion to form a turnup projecting portion, a third roll forming process for forming perpendicularly folded portions at both sides, and a fourth roll forming process for folding a middle portion between the perpendicularly folded portion and the turnup projecting portion in a semi-circular shape. In this way, it is possible to form a turnup projecting portion, insides of which are closely contacted to each other with a curvature which is larger than the conventional curvature, with high speed.

Roll forming method for forming flat tube and roll forming apparatus

According to the present invention, a brake unit is disposed at a side of the forward direction of the fin material from a reforming unit. The brake unit contracts the fin material so that the adjacent folded portions contact with each other while being reformed. Thus, the contracted fin material is in a stable state not to be deformed easily. In this way, even if moment tilting flat portions of corrugated fin is given by the reforming unit, the flat portions are prevented from tilting. A concave or convex deformation of the folded portions can be reformed satisfactorily.

Manufacturing apparatus of a corrugated fin and method of manufacturing

To produce a corrugated fin suitably used to fabricate heat exchangers such as radiators, condensers of the air conditioners, etc., for automobiles, a toothed roller for forming a corrugated fin has circumferential teeth comprising a tooth tip having a concavity, a tooth bottom having a convexity, and a tooth slope having a louver cutting edge between the tooth tip and the tooth bottom, wherein a top of the convexity of the tooth bottom is located at a forward offset from a center line of the tooth bottom with respect to a direction of rotation of the roller.

Roller for forming corrugated fin

Forming rollers having a tooth tip concave portion at the tip of a tooth tip portion, a tooth bottom convex portion at a bottom of a tooth bottom portion and louver cutter at an oblique line portion between the tooth tip portion and the tooth bottom portion. A radius of an arc-shaped portion of the tooth tip concave portion at front side of rotational direction is set to be larger than a radius of an arc-shaped portion of the tooth tip concave portion at a rear side of the rotational direction. A radius of an apex portion of the tooth tip portion at the front side is set to be smaller than a radius of an apex portion of the tooth tip portion at the rear side and louver cutter at the oblique line portion is formed to have a predetermined interval from the apex portions of tooth tip portion. Therefore, flat folded portions having substantially the same curvature at both shoulder portions thereof horizontal are formed.

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Kariya, Japan

Hisashi Kobayashi