Tochigi Fuji Sangyo Kabushiki Kaisha

Makoto Ishizuka

Yasuhiko Ishikawa

Masayuki Sayama

Sakuo Kurihara

Masahiko Asahi

Yoshiyuki Nakabayashi

Kenji Karasawa

Yasushi Koshigaya

Kouji Iizuka

Yoshiaki Kitsunezuka

A wet type friction clutch and an electromagnetic clutch is disclosed wherein a pilot clutch is disposed in a magnetic flux path of an electromagnet and is kept between an armature and the electromagnet . Upon excitation of the electromagnet , the armature is retracted to allow the pilot clutch to be coupled. The pilot clutch includes a plurality of clutch plates which are interleaved with respect to one another for sliding movements. Adjacent clutch plates A, B, A, B, C, D, E, F are formed with oil guide passageways to create a hydrodynamic pressure effect to allow the clutch plates to be separated with a limited drag torque. Further, the clutch plate has magnetic flux path forming portions , at inner and outer peripheral sides, between which through-bores are formed to allow bridge portions to be intervened between the through-bores, with each of the bridge portions being configured such that opposing walls of the bridge portions of adjacent clutch plates have reduced contact surface areas to eliminate a leakage of a magnetic flux.

Wet type friction clutch and electromagnetic clutch

A differential apparatus includes a differential casing, a pair of helical side gears and a pairs of helical pinion gears. The helical pinion gears are accommodated in bores formed in the differential casing, respectively. When it is expected that a helix angle of tooth trace of the helical pinion gear would be decreased by the vehicle's driving, one of the helical pinion gears is formed in advance so that the tooth depths are gradually decreased from axial ends of the helical pinion gear toward the axial intermediate potion. Conversely, when it is expected that a helix angle of tooth trace of the pinion gear would be increased by the vehicle's driving, one of the helical pinion gears is formed in advance so that the tooth depths are gradually increased from the axial ends of the helical pinion gear toward the axial intermediate potion. With the arrangement, even if the helical pinion gears are slanted, the helical pinion gear can be in uniform contact with the bore over the whole tooth width, so that it is possible to prevent an occurrence of the eccentric abrasion and seizure.

Differential apparatus

Growing community of inventors

Tochigi, Japan

Makoto Ishizuka