Disk brake comprising at least one spring for the elastic return of a brake pad, elastic return spring, and replacement kit

1. A disc brake ( 10 ) for an automotive vehicle which includes:

a brake disc ( 12 ) which extends in a plane transverse to an axial orientation axis (A) of rotation of the disc;

a fixed support ( 14 ) which is fixed with respect to a vehicle chassis;

at least one brake pad ( 18 ) which includes a vertical transverse plate ( 19 ) which carries a friction lining ( 24 ) a friction transverse face ( 25 ) of which cooperates with an associated brake track ( 22 ) of the disc ( 12 ), the brake pad ( 18 ) being axially slidingly mounted in the fixed support ( 14 ) between an active front position in which said friction face ( 25 ) bears on the associated brake track ( 22 ) of the disc ( 12 ), and an inactive rear position in which said friction face ( 25 ) is axially spaced from said associated brake track of the disc, by a determined operating play (J 1 ); and

at least one elastic return spring ( 48 ) for the elastic return of the brake pad ( 18 ) to its inactive position including at least one attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) on the fixed support ( 14 ) and including a connecting branch (B 4 ) which is directly or indirectly connected to the brake pad ( 18 ),

wherein said at least one brake pad ( 18 ) includes at least one slidably guiding side lug ( 26 ) which is received in an axial orientation slider ( 28 ) of the fixed support ( 14 );

wherein the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the disc brake ( 12 ) includes a rigid blade ( 200 ) which extends in a plane parallel to an axial displacement direction (A) of the brake pad ( 18 ), and which is axially inserted in said axial orientation slider ( 28 ) of the fixed support ( 14 ),

wherein the blade ( 200 ) is planar and rigid with parallel edges and is axially inserted and housed in a complementary notch ( 31 ) of said slider ( 28 ),

wherein the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the fixed support ( 14 ) includes a stop ( 202 ) which is in contact with a face ( 204 ) facing the fixed support ( 14 ) to block the axial sliding of the elastic return spring ( 48 ) in the direction corresponding to the axial displacement of the brake pad ( 18 ) to its active braking position, the stop ( 202 ) extending in a first direction from a first side of the attachment portion ( 50 ), and

wherein the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the fixed support ( 14 ) includes a stabilizing leg ( 212 ) of the elastic return spring ( 48 ) which cooperates with a portion of said slider ( 28 ), the stabilizing leg ( 212 ) extending in a second direction from a second side of the attachment portion ( 50 ), the first side and the second side of the attachment portion being different sides of the attachment portion.

2. The disc brake according to claim 1 , wherein:

said slider ( 28 ) has, in a cross-section by a vertical transverse plane orthogonal to the axis of rotation of the disc, a “C” shape transversally open to the associated side lug ( 26 ) of the brake pad ( 18 );

the slider ( 28 ) is transversally delimited by an axial orientation vertical bottom ( 30 );

said notch ( 31 ) is formed in said vertical bottom ( 30 ).

3. The disc brake according to claim 2 , wherein said notch ( 31 ) is a machined notch.

4. The disc brake ( 10 ) according to claim 1 , wherein:

the disc brake includes a guide rail ( 32 ) which snugly fits into the walls of said slider ( 28 ) and which is attached to the fixed support ( 14 ); and

the blade ( 200 ) is transversally arranged between said vertical bottom ( 30 ) and a vertical orientation bottom ( 34 ) facing said guide rail ( 32 ).

5. The disc brake according to claim 1 , wherein said stop ( 202 ) belongs to a stop leg ( 206 ) which extends from an axial orientation edge ( 208 ) of the elastic return spring ( 48 ).

6. The disc brake according to claim 1 , wherein said stabilising leg ( 212 ) transversally and horizontally extends from an axial orientation edge ( 208 ) of the elastic return spring ( 48 ).

7. The disc brake according to claim 6 , wherein:

said slider ( 28 ) is vertically delimited by an axial orientation horizontal bottom ( 35 ); and

said stabilising leg ( 212 ) extends to an axial vertical orientation mouth ( 217 ) a free end edge ( 218 ) of which is received in an axial groove ( 216 ) which is formed in said horizontal bottom of said slider ( 28 ).

8. The disc brake according to claim 1 , wherein said connecting branch (B 4 ) is an axial orientation rigid branch parallel to the sliding direction of the brake pad ( 18 ).

9. The disc brake ( 10 ) according to claim 1 , wherein the elastic return spring ( 48 ) includes means for compensating for a wear play (J 2 ) of the friction lining ( 24 ) of the brake pad ( 18 ), which are plastically deformed when a stroke of the brake pad to its active braking position, is higher than said determined operating play (J 1 ).

10. The disc brake ( 10 ) according to claim 1 , wherein the elastic return spring ( 48 ) is a single piece of a material sheet.

11. A replacement kit for a disc brake of an automotive vehicle according to claim 1 , the kit comprising the at least one brake pad ( 18 ) and two of the at least one elastic return spring ( 48 ) paired with said brake pad ( 18 ), each elastic return spring comprising:

the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the disc brake ( 14 ); and

the connecting branch (B 4 ) which is directly or indirectly connected to the brake pad ( 18 );

wherein the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the disc brake ( 12 ) includes the rigid blade ( 200 ) which extends in a plane parallel to the axial displacement direction (A) of the brake pad ( 18 ), to be axially inserted in a complementary portion of the disc brake.

12. The replacement kit according to claim 11 , further comprising two springs ( 100 ) for mounting the brake pad into the disc brake.

13. The disc brake ( 10 ) according to claim 1 , wherein the elastic return spring ( 48 ) is a single piece.

14. A spring ( 48 ) for the axial elastic return of a brake pad ( 18 ), of a disc brake ( 12 ), to an inactive position, wherein the elastic return spring ( 48 ) includes:

an attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the disc brake ( 14 ); and

a connecting branch (B 4 ) which is directly or indirectly connected to the brake pad ( 18 );

wherein the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the disc brake ( 12 ) includes

i) a rigid blade ( 200 ) which extends in a plane parallel to an axial displacement direction (A) of the brake pad ( 18 ), to be axially inserted in a complementary portion ( 28 , 31 ) of the disc brake,

ii) a stop ( 202 ) which is in contact with a face ( 204 ) facing the fixed support ( 14 ) to block the axial sliding of the elastic return spring ( 48 ) in the direction corresponding to the axial displacement of the brake pad ( 18 ) to its active braking position, the stop ( 202 ) extending in a first direction from a first side of the attachment portion ( 50 ), and

iii) a stabilizing leg ( 212 ) of the elastic return spring ( 48 ) which cooperates with a portion of said slider ( 28 ), the stabilizing leg ( 212 ) extending in a second direction from a second side of the attachment portion ( 50 ), the first side and the second side of the attachment portion being different sides of the attachment portion.

15. The spring according to claim 14 , wherein said stabilizing leg ( 212 ) extends from an axial orientation edge ( 208 ) of the elastic return spring ( 48 ).

16. The spring according to claim 14 , wherein said stabilising leg ( 212 ) transversally and horizontally extends from an axial orientation edge ( 208 ) of the elastic return spring ( 48 ).

17. The spring according to claim 14 , wherein said connecting branch (B 4 ) is an axial orientation rigid branch parallel to the sliding direction of the brake pad ( 18 ).

18. The spring according to claim 14 , further comprising means for compensating for a wear play (J 2 ) of a friction lining ( 24 ) of the brake pad ( 18 ), which are interposed between said attachment portion and said connecting branch (B 4 ), and which are plastically deformed when a stroke of the brake pad ( 18 ), along an axial displacement direction to an active braking position, is higher than a determined operating play (J 1 ).

19. The spring according to claim 14 , wherein the spring is a single piece of a material sheet.

20. The spring according to claim 14 , wherein the spring is a single piece.

21. A disc brake ( 10 ) for an automotive vehicle, comprising:

a brake disc ( 12 ) which extends in a plane transverse to an axial orientation axis (A) of rotation of the disc;

a fixed support ( 14 ) which is fixed with respect to a vehicle chassis;

at least one brake pad ( 18 ) which includes a vertical transverse plate ( 19 ) which carries a friction lining ( 24 ) a friction transverse face ( 25 ) of which cooperates with an associated brake track ( 22 ) of the disc ( 12 ), the brake pad ( 18 ) being axially slidingly mounted in the fixed support ( 14 ) between an active front position in which said friction face ( 25 ) bears on the associated brake track ( 22 ) of the disc ( 12 ), and an inactive rear position in which said friction face ( 25 ) is axially spaced from said associated brake track of the disc, by a determined operating play (J 1 ); and

at least one elastic return spring ( 48 ) for the elastic return of the brake pad ( 18 ) to its inactive position including at least one attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) on the fixed support ( 14 ) and including a connecting branch (B 4 ) which is directly or indirectly connected to the brake pad ( 18 ),

wherein said at least one brake pad ( 18 ) includes at least one slidably guiding side lug ( 26 ) which is received in an axial orientation slider ( 28 ) of the fixed support ( 14 ),

wherein the attachment portion ( 50 ) for attaching the elastic return spring ( 48 ) to the disc brake ( 12 ) includes a rigid blade ( 200 ) which extends in a plane parallel to an axial displacement direction (A) of the brake pad ( 18 ), and which is axially inserted in said axial orientation slider ( 28 ) of the fixed support ( 14 ),

wherein the blade ( 200 ) is planar and rigid with parallel edges and is axially inserted and housed in a complementary notch ( 31 ) of said slider ( 28 ),

wherein the disc brake includes a guide rail ( 32 ) which snugly fits into the walls of said slider ( 28 ) and which is attached to the fixed support ( 14 ); and

wherein the blade ( 200 ) is transversally arranged between said vertical bottom ( 30 ) and a vertical orientation bottom ( 34 ) facing said guide rail ( 32 ).