Dynax Corporation

Han Zhi-peng

Norio Takakura

A friction engagement device has single-faced externally toothed disks interleaved with single-faced internally toothed disks which are engageable by an annular piston. The thickness of the externally toothed disks is less than the thickness of the internally toothed disks for improved heat dissipation performance.

Single-faced disk type friction engagement device of equalized

A friction plate for a friction engagement device has a pattern of grooves in the surface thereof. In one embodiment, radial grooves are inclined from the inner edge of the plate to the outer edge which divide the plate into friction material segments. A pair of radially spaced connecting grooves traverse each segment to connect the radial grooves which define the segment, and are staggered radially from the pairs of connecting grooves of the adjacent segments, so that the grooves of adjacent pairs alternate in radial location across the radial groove which divides them. In another embodiment, tangential grooves form a regular polygon inscribing the outer edge of the friction plate. In both embodiments, oil traverses the surface of the plate from the inner diameter edge to the outer diameter edge by a serpentine route alternating between the radial grooves and the connecting or tangential grooves.

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Hokkaido, Japan

Han Zhi-peng