The tooth part includes: a tubular portion having an inner tooth portion formed on an inner peripheral surface and an outer tooth portion formed on an outer peripheral surface; a plurality of inner peripheral wall portions that each extend in an axial direction of the tubular portion and form a tooth tip portion of the inner tooth portion and a tooth bottom portion of the outer tooth portion; a plurality of outer peripheral wall portions that each extend in the axial direction and form a tooth bottom portion of the inner tooth portion and a tooth tip portion of the outer tooth portion; and an annular rib that is joined to the outer peripheral wall portions and that extends in an annular shape on an open end side with respect to the inner peripheral wall portions in the axial direction and radially outward from the inner peripheral wall portions, at an open end of the tubular portion.

The tooth part includes: a tubular portion having an inner tooth portion formed on an inner peripheral surface and an outer tooth portion formed on an outer peripheral surface; a plurality of inner peripheral wall portions that each extend in an axial direction of the tubular portion and form a tooth tip portion of the inner tooth portion and a tooth bottom portion of the outer tooth portion; a plurality of outer peripheral wall portions that each extend in the axial direction and form a tooth bottom portion of the inner tooth portion and a tooth tip portion of the outer tooth portion; and an annular rib that is joined to the outer peripheral wall portions and that extends in an annular shape on an open end side with respect to the inner peripheral wall portions in the axial direction and radially outward from the inner peripheral wall portions, at an open end of the tubular portion.

A friction engagement device of an automatic transmission is provided with a cylindrical drum part supporting an annular friction plate. The drum part includes a cylindrical body with a spline part having serrations extending in the axial direction and depressed radially outward to fit with the friction plate, in an inner circumferential side surface, a vertical wall part provided at an end side of the cylindrical body and extending radially inward, and a corner part provided between the cylindrical body and the vertical wall part. A drum recess is formed inside the corner part, connected to the serration and depressed toward an axial end side. A cut part is provided outside the corner part, connected to the drum recess, and cut in the circumferential direction of the drum part. The drum recess is opened to an outside by the cut part to form an oil gallery.

Various clutch adjusting assemblies for incorporating in drain cleaning machines are described. The assemblies enable adjustment or setting of a clutch in a drain cleaning machine without the use of tools.

Various clutch adjusting assemblies for incorporating in drain cleaning machines are described. The assemblies enable adjustment or setting of a clutch in a drain cleaning machine without the use of tools.

In some examples, a cone clutch assembly includes an inner cone member defining a first friction surface; an outer cone member defining a second friction surface opposing the first friction surface; and an independent friction member positioned between the first friction surface of the inner cone member and the second friction surface of the outer cone member. The inner cone member and outer cone member are configured to be selectively engaged and disengaged from each other. When the inner cone member is engaged with the outer cone member, the first friction surface of the inner cone member frictionally engages a third friction surface of the friction member, and the second friction surface of the outer cone member engages a fourth friction surface of the friction member such that rotational motion is transferred between the inner cone member and the outer cone member via the friction member.

There is provided a method for producing a wet friction plate that can improve the retention property of lubricating oils in a fine groove formed by laser light. In a method for producing a wet friction plate (200), a friction material (210) is produced by sheet making processing in a first step. Thereafter, in a second step, a fine groove (211) is formed on the friction material (210). The friction material (210) is produced such that thermosetting resin therein is in a semi-cured state. The cross-sectional shape of the fine groove (211) is formed into a V shape by laser light. Subsequently, in a third step, the friction material (210) is disposed on a core metal (201) via an adhesive agent including thermosetting resin. Subsequently, in a fourth step, the friction material (210) is pressed while heated to crush the fine groove (211). In this manner, unevenness is formed on an intra-groove surface (212), and the thermosetting resin is completely cured.

An inner drum that includes a coupling part having an external surface and an internal surface, wherein the internal surface contains splines. An annular trough is engaged to the exterior surface of the coupling part. A circular wall contains a plurality of appendages extending upward from the circular wall. At least one slot is disposed within the appendages for receiving a snap ring.

An inner drum that includes a coupling part having an external surface and an internal surface, wherein the internal surface contains splines. An annular trough is engaged to the exterior surface of the coupling part. A circular wall contains a plurality of appendages extending upward from the circular wall. At least one slot is disposed within the appendages for receiving a snap ring.

A friction material composition of the present invention includes a fibrous base, a friction regulator, and a binder and has a copper content of 0.5 mass % or less in terms of copper element amount. The friction material composition contains regenerated cellulosic fibers as the fibrous base. In an embodiment of the friction material composition, the regenerated cellulose fiber has a fiber length of 2 mm to 20 mm.