Composite disc rotor
A composite disc rotor includes a disc main body, a coupling bracket and coupling units. Each of the coupling units includes a bobbin, a clip and a coupling bolt. A head part of the bobbin includes a torque receiving portion inserted in the notch and a projection projected in a circumferential direction from an end of the torque receiving portion. A pipe part of the bobbin is extended from the head part and is fitted in a coupling through hole of the disc main body. The clip includes a connecting portion between the torque receiving portion and the notch and a pressing portion extended from the connecting portion between the head part and the coupling bracket. The coupling bolt is inserted into each of through hole of the bobbin to fix the coupling bracket to the coupling unit.
1. A composite disc rotor comprising:
a disc main body, having a ring shape, having a pair of friction surfaces which are opposite each other in an axial direction of the disc main body and to which pads are pushed upon braking, including a plurality of coupling portions at a plurality of circumferential positions of the disc main body, each of the coupling portions being disposed at an inner side in a radial direction of the disc main body and being formed with a coupling through hole;
a coupling bracket, having a plurality of notches which are opened in an outer peripheral edge of the coupling bracket and disposed at the plurality of circumferential positions; and
a plurality of coupling units, disposed at the plurality of circumferential positions, and each of which includes a bobbin including a head part and a pipe part, a clip and a coupling bolt, wherein
the head part includes a torque receiving portion inserted in each of the notches and a projection projected in a circumferential direction of the disc main body from an end of the torque receiving portion in the axial direction,
the pipe part is extended from the head part and is fitted in the coupling through hole,
each of the bobbins is formed with a through hole penetrating the head part and the pipe part,
each of the clips includes a connecting portion which is located between the torque receiving portion and an inner surface of each of the notches and two pressing portions which are extended from the connecting portion in the circumferential direction and located between the head part and the coupling bracket,
each of the coupling bolts is inserted into each of the through holes of the bobbins to fix the coupling bracket to the coupling unit, so that a torque applied to the friction surfaces is transmitted to the coupling bracket via the bobbin,
each of the pressing portions includes a spring portion that extends from a tip edge of the pressing portion, the spring portion having a tip end direct to the head part of the bobbin, and is provided between the projection and the coupling bracket so as to urge the projection away from the coupling bracket in the axial direction, and
the pressing portions are only extended from an edge of the connection portion at a side of the head part in the axial direction such that an edge of the connection portion at a side of the pipe part in the axial direction does not include pressing portions.
2. The composite disc rotor according to claim 1 , wherein
the connection portion surrounds three sides of the torque receiving portion of each bobbin and has a folded-back shape,
the pressing portions are extended from opposed positions of the connection portion, which are bent from the edge of the connection portion to an opposite side to the torque receiving portion, and
a part of each of the pressing portions is contacted to both circumferential side portions of each of the notches.
3. The composite disc rotor according to claim 2 , wherein
the spring portions are formed by folding back the tip ends of the pair of the pressing portions which are extended from the edge of the connection portion at the side of the head part in the axial direction, toward the head part, and
the spring portions are held between the head part and the pressing portions with being elastically compressed in the axial direction.
4. The composite disc rotor according to claim 2 , wherein
the respective pressing portions are extended from two positions of the connecting portion,
the two positions are the opposed positions of the connection portion in the edge thereof at the side of the head part in the axial direction, and
both the pressing portions are contacted to one axial surface of both circumferential sides of each notch.
5. The composite disc rotor according to claim 1 , wherein
each of the clips is integrally formed of a metal sheet having a resilience and corrosion resistance.
6. The composite disc rotor according to claim 1 , wherein
at least a part of an inner surface of each of the through holes of the bobbins is formed with a female screw, and
each of the coupling bolts is screwed with the female screw.