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Title: Disc-brakes, especially for automobile vehicles
Claims: What I claim is: 1. A disc brake comprising a fixed support, a disc rotatably mounted with a shaft to be braked, a major part of the fixed support being substantially parallel to said disc, a brakeshoe disposed on each side of said disc for movement perpendicular to the plane of said disc, a transfer member mounted on said fixed support for movement perpendicular to the plane of the disc, a hydraulic operating unit acting directly on a first of said brakeshoes and indirectly on a second of said brakeshoes through said transfer member, resilient means for urging said transfer member into contact with retaining stop means, two brackets fixed to said major part of said fixed support and projecting outwardly from the side of said major part remote from said disc, each bracket having a flat surface perpendicular to said disc and to said major part and defining one of said retaining stop means, said flat surfaces being disposed in a common plane that is perpendicular to a radial plane that includes the axis of the disc and that bisects said transfer member, said transfer member having two laterally projecting substantially cylindrical coaxial lugs the common axis of which is parallel to said common plane and to the plane of the disc, said lugs being in line contact with and movable along said flat surfaces of said brackets, and each said lug being disposed between the said flat surface of the associated said bracket and the axis of said disc. 2. A disc brake as claimed in claim 1, wherein said lugs form the ends of a rod extending through a hole in said transfer member perpendicular to the axial plane of symmetry of said brake, there being clearance between the rod and the hole. 3. A disc brake as claimed in claim 2 wherein said rod is of generally cylindrical configuration. 4. A disc brake as claimed in claim 2 wherein the transverse dimension of the lugs is smaller than the transverse dimension of the central portion of the rod between the lugs, shoulders on the rod between the lugs and the central portion and cooperating with the corresponding brackets axially retaining said rod when said resilient means acts on said transfer member. 5. A disc brake as claimed in claim 1, wherein said resilient means comprises two bending springs disposed one on each side of said transfer member, each of said springs having a supporting zone in contact with said transfer member and said fixed support and also at least one lever arm having a free extremity hooked on said fixed support. 6. A disc brake as claimed in claim 5, wherein the supporting zone of each of said springs includes three successive contact areas, two of said contact areas being in contact with one of said members, a third area, intermediate the first two areas, being in contact with the other of said members. 7. A disc brake as claimed in claim 6, wherein said intermediate contact area is in contact with said transfer member. 8. A disc brake as claimed in claim 5, wherein the supporting zone of said bending springs is axially offset with respect to said disc, the intermediate supporting area of said springs extending beyond the plane of said disc. 9. A disc brake as claimed in claim 8, wherein each of said bending springs comprises two lever arms one on each side of said corresponding supporting zone. 10. A disc brake as claimed in claim 9, wherein at least one of said lever arms of each bending spring ending in a hook that engages said fixed support. 11. A disc brake as claimed in claim 9, wherein each bending spring is of round wire. 12. A disc brake as claimed in claim 9, wherein said bending springs are arranged so as to urge said transfer member radially outwardly from the axis of said disc towards the periphery thereof. 13. A disc brake as claimed in claim 1, wherein said first and second brakeshoes are identical. 14. A disc brake as claimed in claim 1, wherein said fixed support is generally T-shaped and comprises an end plate substantially parallel to said disc, there being a notch in the central zone of said end plate for receiving the first brakeshoe, and a bracket on each side of said notch extending substantially perpendicular to said end plate to each side thereof, along its edge nearest the periphery of said disc. 15. A disc brake as claimed in claim 1, wherein said hydraulic operating unit comprises a blind cylinder fixed to said transfer member. 16. A disc brake as claimed in claim 1, wherein said transfer member is generally U-shaped and extends substantially radially on said disc and said brakeshoes to each side of said brakeshoes. 17. A disc brake according to claim 1, said brakeshoes having friction linings on the same side as said disc, at least one of said brakeshoes having a supporting plate with a single axially projecting boss on said supporting plate having a closed contour, said boss being disposed on the face of said at least one brakeshoe opposite the associated said friction lining, the center of the boss lying in a plane of symmetry of said transfer member that passes through the axis of the disc. 18. A disc brake according to claim 17, wherein at least one of said brakeshoes has, on each side, lateral extensions each terminating in a supporting end face. 19. A disc brake as claimed in claim 18, wherein said supporting end faces of said lateral extensions of the supporting plate of said brakeshoe are flat. 20. A disc brake as claimed in claim 19, wherein said supporting end faces of said lateral extensions of the supporting plate of said brakeshoe are parallel to each other. 21. A disc brake as claimed in claim 19, wherein the end faces of the lateral extensions of the supporting plate of said brakeshoe are coplanar. 22. A disc brake as claimed in claim 18, wherein the supporting plate of said brakeshoe is substantially rectangular in shape, said lateral extensions of said plate extending symmetrically from two consecutive corner zones of said plate. 23. A disc brake as claimed in claim 2, wherein the edge of the supporting plate between the two lateral extensions is slightly convex. 24. A disc brake as claimed in claim 18, wherein each of the lateral extensions of the supporting plate comprises successively a first section oblique with respect to the edge of the plate from which it extends, and a second section substantially parallel to said edge. 25. A disc brake as claimed in claim 18, wherein said second brakeshoe has a boss, and said transfer member has a recess which is at least partly complementary with said boss and in engagement therewith, the end faces of said lateral extensions of the supporting plate of the second brakeshoe being in contact with two of said retaining stop means on said fixed support, whereby said transfer member is supported on said last-mentioned stop means by said second brakeshoe, successively through the lateral flank of the recess with which the boss is in engagement, and then part of the lateral flank of said boss and the lateral extensions on the support plate of said brakeshoe. 26. A disc brake as claimed in claim 25, wherein the recess in said transfer member that receives the boss of the second brakeshoe has a lateral slot whose width is smaller than the corresponding dimension of said boss. 27. A disc brake as claimed in claim 26, further comprising fixing means provided between said transfer member and the second brakeshoe, said fixing means comprising a screw threadedly engaged in the boss of said second brakeshoe, and a resilient pin supported at its midsection on said screw and at its extremities to each side of said transfer member. 28. A disc brake as claimed in claim 27, in which said resilient pin is a generally U-shaped hair pin, the midsection of which is offset perpendicular to the median plane of the rest of the pins, and wherein the arms of the pin form a circular opening in the central zone of said midsection. 29. A disc brake as claimed in claim 28, wherein said resilient pin is biased in position for urging the corresponding brakeshoe against said transfer member. 30. A disc brake as claimed in claim 17, wherein said boss on the supporting plate is stamped therein. 31. A disc brake as claimed in claim 17, wherein said boss on the supporting plate has a cylindrical flank with a circular contour. 32. A disc brake as claimed in claim 17, wherein the entire boss is located at a distance from the periphery of said plate. 33. A disc brake as claimed in claim 32, there being an opening in said transfer member in a portion thereof substantially parallel to the axis of said disc. 34. A disc brake as claimed in claim 17, there being a screw-threaded hole in the central zone of said boss. 35. A disc brake as claimed in claim 17, wherein the central zone of the boss of the supporting plate comprises a bowlshaped depression. 36. A disc brake according to claim 1, wherein said lugs are located on opposite sides of said radial plane. Other info: Inventors: de Gennes, Marie Alfred Gerard (Senlis, FR) Application Number: 442898 Filing Date: 1974-02-15 Publication_date: 1976-05-25 Assignee: Societe Anonyme Francaise du Ferodo (Paris, FR) Primary Class(es): 188/73.43 188/73.1, 188/243 Other Classes: US Patent Ref:
Other Refs:
Primary Examiner: Halvosa, George E. A. Assistant Examiner: Attorney: Young & Thompson |
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