US 12,345,305 B2
Disc brake comprising at least one elastic return spring for a brake pad, elastic return spring, replacement kit and mounting method
Ange Kongo Konde, Angers (FR); Xavier Labarre, Saint Georges du Bois (FR); Didier Esnee, Le Mans (FR); Jean-Louis Bonnec, Les Ponts de Ce (FR); and Fabien Chaigneau, Rochefort sur Loire (FR)
Assigned to HITACHI ASTEMO FRANCE, Drancy (FR)
Appl. No. 17/596,564
Filed by HITACHI ASTEMO FRANCE, Drancy (FR)
PCT Filed Jun. 17, 2020, PCT No. PCT/EP2020/066787
§ 371(c)(1), (2) Date Dec. 13, 2021,
PCT Pub. No. WO2020/260098, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 1906953 (FR), filed on Jun. 26, 2019.
Prior Publication US 2022/0252120 A1, Aug. 11, 2022
Int. Cl. F16D 65/54 (2006.01); F16D 55/225 (2006.01); F16D 65/097 (2006.01); F16D 125/58 (2012.01)
CPC F16D 65/543 (2013.01) [F16D 55/225 (2013.01); F16D 65/0978 (2013.01); F16D 65/0979 (2013.01); F16D 2125/582 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An axial elastic return spring for axially returning a brake pad of a disc brake from an active position to an inactive position, said spring being intended to be interposed between the brake pad and a fixed support, said spring comprising:
an elastic deformation portion, arranged to produce a reaction force during pressing of said pad in the active position, so as to return translationally said brake pad to the inactive position;
a carrier portion arranged to be fastened on the fixed support of the disc brake, and which is integral with the deformation portion;
a pad portion arranged to be fastened to the brake pad, in the form of a fastening tab, which is integral with the deformation portion and which extends in a plane orthogonal to a direction of axial sliding (A) of the brake pad;
the carrier portion including a support part having a first support section which:
is integral with the deformation portion;
extends in a plane orthogonal to the direction of axial sliding (A) of the brake pad; and
is arranged to press axially on the fixed support under the effect of the deformation of the spring when the brake pad leaves its inactive position, and the carrier portion comprises a connection part comprising at least one connection fold arranged and configured to press on an anchoring part carried by a transverse face of the fixed support, and cooperate with said anchoring part to prevent lifting of said connection part;
the connection part including:
a second lateral connection section, a proximal end of which is connected to the first support section by a first fold, a folding axis of which is orthogonal to the axial sliding direction (A) of the displacement of the brake pad;
a third connection section, a proximal end of which is connected to the second section by a second fold, a folding axis of which is orthogonal to the axial sliding direction (A) of the displacement of the brake pad;
a fourth lateral connection section comprising a distal end, and a proximal end connected to the third section by a third fold, a folding axis of which is orthogonal to the axial sliding direction (A) of the displacement of the brake pad; and
the at least second lateral connection, the third connection, and the fourth lateral connection sections and/or the first, second and third folds being arranged to substantially form a “U”, in such a way that the connection part can fit on the anchoring part in the form of a peg, and thus prevent the lifting by a pinching of said peg,
whereby when the brake pad leaves its inactive position, the first support section, during a displacement M1, is arranged to press axially on the fixed support with an axial pressing force T1 under the effect of the deformation of the spring, and the connection part is arranged to prevent the lifting of the connection part by pinching of the peg according to a pinching force T3 by the second and fourth sections of the connection part which thus opposes a lifting M2 of the connection part and by a lever effect around a radial direction passing through the support part, due to the axial pressing force T1, the elasticity of the spring thus exerts an axial lifting force T2, on the carrier, and an axial return force, TO, on the brake pad, to return the brake pad to the inactive position.