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The invention provides a floating type brake disc which can absorb a shock applied to a hub from a rotor at a time of running on a punishing road, can improve a heat lowering performance and can widely reduce a number of parts. A brake disc (1) is constituted by a hub (20), a rotor (10) and a ring s

The invention provides a floating type brake disc which can absorb a shock applied to a hub from a rotor at a time of running on a punishing road, can improve a heat lowering performance and can widely reduce a number of parts. A brake disc (1) is constituted by a hub (20), a rotor (10) and a ring spring (30). A lot of protrusion portions (11) in a radial direction are provided along a peripheral direction in an inner peripheral edge portion of the rotor (10), the same number of projection portions (21) in an axial direction are provided along the peripheral direction in an outer peripheral edge portion of the hub (20), and the protrusion portions (11) are protruded to an inner side in the radial direction through a gap (22) between the projection portions (21). The ring spring (30) is constituted by an open ring having an approximately L-shaped cross section. A line (30b) in a radial direction of the ring spring is fitted and mounted to a groove (23) in an inner peripheral surface of the projection portion (21) of the hub protruding from the rotor, and an inner peripheral surface of a protrusion portion (12) in the rotor is pressed to an outer side in the radial direction by a line (30a) in the axial direction of the ring spring.

대표청구항 ▼

The invention claimed is: 1. A floating type brake disc comprising: a hub; a rotor coaxially arranged in an outer side of the hub, wherein the rotor includes a plurality of protruding portions provided at an inner peripheral edge portion of the rotor and extending in a direction away from the inner

The invention claimed is: 1. A floating type brake disc comprising: a hub; a rotor coaxially arranged in an outer side of the hub, wherein the rotor includes a plurality of protruding portions provided at an inner peripheral edge portion of the rotor and extending in a direction away from the inner peripheral edge portion of the rotor; and an elastic member having an approximately L-shaped cross section defined by a first leg and a second leg, wherein the first leg of the elastic member directly engages an axial end surface of the protruding portions extending from the rotor and the second leg of the elastic member directly engages the hub and extends parallel relative to the protruding portions, wherein the elastic member floatably mounts the rotor to the hub in an axial direction, and wherein the rotor is mounted to the hub in a state in which the rotor is pressed in a radial direction by the elastic member. 2. A brake disc as claimed in claim 1, wherein the plurality of protruding portions of the rotor define a space in a peripheral direction, the same number of projection portions in an axial direction as the number of the protruding portions are provided in a back surface side of an outer peripheral edge portion of the hub to define a space in a peripheral direction, the protruding portions of the rotor protrude to an inner side in the radial direction through a portion between the projection portions of the hub, and wherein the elastic member is a ring spring that presses an inner peripheral surface of the protruding portions of the rotor to an outer side in the radial direction by one line is fixed to a portion of the projection portions of the hub protruding in the axial direction from the protruding portion of the rotor. 3. A brake disc as claimed in claim 2, wherein a groove extending along a peripheral direction is provided in an inner peripheral surface of the portion of the projection portions of the hub protruding in the axial direction from the protruding portion of the rotor, another line of the ring spring is fitted to the groove, and the groove is collapsed by caulking the projection portion, whereby the ring spring is fixed to the projection portion. 4. A brake disc as claimed in claim 2, wherein a step portion is provided in an inner peripheral surface of the portion of the projection portions of the hub protruding in the axial direction from the protruding portion of the rotor, another line of the ring spring is brought into contact with the step portion, and the ring spring is fixed to the projection portion by caulking the projection portion from the above of the another line. 5. A brake disc as claimed in claim 2, wherein a protruding piece in the axial direction is provided in a protruding manner in the projection portion of the hub, a hole is provided in another line of the ring spring so as to insert the protruding piece to the hole, and the ring spring is fixed to the projection portion by caulking the inserted protruding piece from the above of the another line. 6. A brake disc as claimed in claim 5, wherein the protruding piece in the axial direction is formed by notching one line of the ring spring, and a pressure contacting projection toward an outer side in the radial direction is provided in the protruding piece. 7. A brake disc as claimed in claim 1, wherein an outer peripheral edge portion of the hub is offset to an outer side in the axial direction with respect to the mounting portion to a wheel in an inner peripheral side of the hub, and a cross section along the radial direction in an intermediate portion between the mounting portion and the outer peripheral edge portion of the hub is bent so as to be convex to an inner side of the axial direction. 8. A brake disc as claimed in claim 2, wherein an outer peripheral edge portion of the hub is offset to an outer side in the axial direction with respect to the mounting portion to a wheel in an inner peripheral side of the hub, and a cross section along the radial direction in an intermediate portion between the mounting portion and the outer peripheral edge portion of the hub is bent so as to be convex to an inner side of the axial direction. 9. A brake disc as claimed in claim 3, wherein an outer peripheral edge portion of the hub is offset to an outer side in the axial direction with respect to the mounting portion to a wheel in an inner peripheral side of the hub, and a cross section along the radial direction in an intermediate portion between the mounting portion and the outer peripheral edge portion of the hub is bent so as to be convex to an inner side of the axial direction. 10. A brake disc as claimed in claim 4, wherein an outer peripheral edge portion of the hub is offset to an outer side in the axial direction with respect to the mounting portion to a wheel in an inner peripheral side of the hub, and a cross section along the radial direction in an intermediate portion between the mounting portion and the outer peripheral edge portion of the hub is bent so as to be convex to an inner side of the axial direction. 11. A brake disc as claimed in claim 5, wherein an outer peripheral edge portion of the hub is offset to an outer side in the axial direction with respect to the mounting portion to a wheel in an inner peripheral side of the hub, and a cross section along the radial direction in an intermediate portion between the mounting portion and the outer peripheral edge portion of the hub is bent so as to be convex to an inner side of the axial direction. 12. A brake disc as claimed in claim 6, wherein an outer peripheral edge portion of the hub is offset to an outer side in the axial direction with respect to the mounting portion to a wheel in an inner peripheral side of the hub, and a cross section along the radial direction in an intermediate portion between the mounting portion and the outer peripheral edge portion of the hub is bent so as to be convex to an inner side of the axial direction.