Abstract: A brake disk assembly is provided wherein the friction disk section has protrusions on the portion of the disk nearer the hub spoke like that overlap joining protrusions from the hub section. The protrusions are joined with stepped size pins that fit a first size opening in the hub section and a second size opening in the disk section. The pins provide resiliency such that in drag in the direction perpendicular to the shaft of the hub, there is very small available motion yet expansion on the part of the disk is accommodated by motion translated through the resiliency achieved by the pins in the different size openings.

Abstract: A brake disk has a ring-shaped braking section with plural inner circumferential spokes, a hub section with plural outer circumferential spokes, a dish-shaped spring so placed on the same side surfaces of a pair of the plurality of spokes as to be in pressure contact commonly therewith, and a connecting pin used with the spring to connect the paired spokes and disposed to allow both of the paired spokes to move relatively slightly with respect to each other. One spoke is provided on a surface of its end portion thereof with a circumferential groove and the other paired spoke is provided on a surface of its end portion with a circumferential ridge. The ridge is loosely inserted in the groove when assembled. The dimension of the ridge is such that a small play exists in both the axial and radial directions when the ridge is inserted in the groove.