Disc brake

A disc brake for a motorcycle wheel which is supported by a pair of fork legs for rotation about an axis, said wheel including a rim, the disc brake comprising an annular disc having opposite sides and an outer peripheral portion adjacent said rim, fastening means securing said outer peripheral portion to said rim, said fastening means allowing said disc limited axial play relative to said rim, a brake caliper mounted on one of said fork legs, in operative position said caliper being stationary relative to said one of said fork legs, said caliper having a bridge portion which straddles an inner periphery of said disc and leg portions extending from the bridge adjacent said opposite sides of said disc, each said leg portion carrying at least one hydraulically actuated piston, said pistons being operable to press friction pads against the opposite sides of the disc, said fastening means comprising members which locate in said rim, said peripheral portion defining openings each extending through said disc in a direction axially of the disc, a respective said member passing through each said opening, each said opening being elongated in the radial direction so as to provide elongate spaced edges and so as to define a radial clearance between said opening and said member therein, and each said opening extending radially inwardly to form a radial slot to facilitate radial thermal expansion of the disc and to facilitate assembly of the disc onto the rim.

A disc brake for a motorcycle wheel, said wheel being supported by a pair of fork legs for rotation about an axis, the disc brake comprising an annular disc having opposite sides and an outer peripheral portion, fastening means securing said outer peripheral portion to said wheel, said fastening means allowing said disc limited axial play relative to said wheel, a brake caliper mounted on one of said fork legs, said caliper having first and second arms, a bridge portion which straddles an inner periphery of said disc and leg portions extending from said bridge adjacent said opposite sides of said disc, one of said arms extending from one of the leg portions and the other of said arms extending from said bridge portion, the said arms being secured to the said one of said fork legs to prevent axial movement of the caliper relative thereto, and the caliper being removable from one of said fork legs upon release of said arms in an operative position, said caliper being stationary relative to said fork legs, each said leg portion carrying at least one hydraulically actuated piston, said pistons being operable to press friction pads against the opposite sides of the disc, said fastening means comprising members which locate in said wheel, said peripheral portion defining openings extending through said disc in a direction axially of the disc, a respective said member passing through each said opening, each said opening being elongated in the radial direction so as to provide elongate spaced edges and so as to define a radial clearance between said opening and said member therein, each said opening extending radially inwardly to form a radial slot to facilitate radial thermal expansion of the disc and to facilitate assembly of the disc onto the wheel.

A disc brake for a motorcycle wheel which is supported by a pair of fork legs for rotation about an axis, the disc brake comprising an annular disc having opposite sides and an outer peripheral portion, fastening means securing said outer peripheral portion to said wheel, said fastening means allowing said disc limited axial play relative to said wheel, a brake caliper mounted on one of said fork legs, in operative position said caliper being stationary relative to said one of said fork legs, said caliper having a bridge portion which straddles an inner periphery of said disc and leg portions extending from the bridge adjacent said opposite sides of said disc, each said leg portion carrying at least one hydraulically actuated piston, said pistons being operable to press friction pads against the opposite sides of the disc, said fastening means comprising members which locate in said wheel, said peripheral portion defining openings each extending through said disc in a direction axially of the disc, a respective said member passing through each said opening, each said opening being elongated in the radial direction so as to provide elongate spaced edges and so as to define a radial clearance between said opening and said member therein, each said opening extending radially inwardly to form a radial slot to facilitate radial thermal expansion of the disc and to facilitate assembly of the disc onto the wheel, said caliper having first and second arms secured to said one of said fork legs whereby a torque load will act on the caliper along a direction towards said fork leg on application of the brake with the disc rotating in the direction for forward movement of the motorcycle, one of said arms extending from one of the leg portions and the other of said arms extending from said bridge portion, the said arms being secured to the said one of said fork legs to prevent axial movement of the caliper relative thereto, and the caliper being removable from one of said fork legs upon release of said arms.