Disc brake pad, spring for disc brake caliper and disk brake caliper assembly

Patent metadata

Field	Value
Publication number	US-10316912-B2
Application number	US-201515302923-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Apr 8, 2014
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The invention relates to a brake pad ( 12,13 ) of a disc brake ( 2 ) comprising a support plate ( 15 ) having a thrust surface ( 18 ) to receive the thrust of at least one piston, and a friction surface ( 19 ) to which a friction portion ( 16 ) is associated, associated to said support plate ( 15 ) to rest on a friction surface ( 4,5 ) of said brake disc ( 2 ), said pad comprising a support plate edge ( 17 ) which delimits said thrust surface ( 18 ) and friction surface ( 19 ), said thrust plate edge ( 17 ) comprising an upper edge portion ( 28 ), substantially facing or directed outwards in the outward sense (RE) of said radial direction (R-R), said thrust plate edge ( 17 ) comprising an upper edge portion ( 20 ), substantially facing or directed in the inward sense (RI) of said radial direction (R-R), said thrust plate edge ( 17 ) comprising two lateral edge portions ( 21, 22 ) opposite each other and substantially facing or directed in the tangential direction (T-T), said lateral edge portions ( 21, 22 ) each comprising a lower lateral edge sub-portion ( 30 ), next to the lower edge portion ( 20 ), which extends by an extension less than or equal to a third of the longitudinal extension of said lateral edge portion ( 21, 22 ), wherein said upper edge portion ( 18 ) of said thrust plate edge ( 17 ) comprises at least one tab ( 23 ) forming a seat ( 24 ), open or closed, and defining a spring surface ( 25 ) facing or directed substantially in an inward direction (RI) in said radial direction (R-R), to receive and support a thrust portion ( 26 ) of a spring device ( 27 ) adapted to stress the brake pad with at least one direct thrust component in the outward direction (RE) of said radial direction (R-R), and wherein all along said upper edge portion ( 28 ) there is no upper support portion of the caliper body ( 8 ), superiorly avoiding the support of the plate or of the pad by the caliper body ( 8 ) to exert a reaction to the thrust component having an outward sense (RE) of said radial direction (R-R) to the stress action of the spring device ( 27 ); and wherein a portion of the support plate ( 15 ) which is delimited by said lower lateral edge sub-portion ( 30 ), and/or by said lower edge portion ( 20 ), comprises a lower portion resting on the support plate ( 15 ) of the caliper body, defining a caliper support surface resting on the support plate of the caliper body to exert a reaction to the thrust component of the spring device ( 27 ); and wherein said caliper support surface ( 32 ) substantially faces, or has a sense, in the outward sense (RE) of said radial direction (R-R) to rest directly or indirectly on the caliper body ( 8 ), so that said pad is pulled radially outwards substantially in its entire radial extension, in the outward sense (RE).

First claim

The invention claimed is:

1. A brake pad of a disc brake for resting on first friction surfaces of a disc, said disc defining an X-X axis parallel to the direction of rotation of the disc, a radial axis orthogonal to and incident with said X-X axis and a tangential axis orthogonal to said X-X axis and said radial axis, said brake pad including a support plate having a thrust surface, the thrust surface positioned to receive a thrust of at least one piston, and a friction surface including a friction portion of said disc brake, said brake pad comprising: a support plate edge which delimits said thrust surface and a second friction surface, said support plate edge including an upper edge portion facing outwards along said radial axis, said support plate edge comprising a lower edge portion facing inward along said radial axis, said support plate edge comprising lateral edge portions facing along the tangential axis, said lateral edge portions including a lower lateral edge sub-portion next to the lower edge portion, the lower edge portion extending at most a third of the longitudinal extension of said lateral edge portions;
wherein said upper edge portion of said support plate edge comprises at least one tab forming a seat and defining a spring surface facing inward along said radial axis to receive and support a thrust portion of a spring device adapted to press the brake pad with at least one thrust component directed outward along said radial axis;
wherein said upper edge portion is spaced from the caliper body such that there is no upper support portion of the caliper body, superiorly avoiding the support of the plate or of the pad by the caliper body to exert an outward reaction to the thrust component along said radial axis to a stress action of the spring device;
wherein a portion of the support plate which is delimited by said lower lateral edge sub-portion and by said lower edge portion, comprises a lower caliper body support portion of the support plate, defining a caliper support surface supporting the support plate on the caliper body to exert a reaction to the thrust component of the spring device; and
wherein said caliper support surface faces outward along said radial axis to rest on the caliper body, so that said brake pad is pulled radially outwards in an entire radial extension of the brake pad.

2. The brake pad of the disc brake according to claim 1 , wherein:
said caliper support surface is positioned along said lower lateral edge sub-portion and said lower edge portion and faces outward along said radial axis and is positioned on the caliper body;
said caliper support surface positioned inside said support plate which delimits said lower lateral edge sub-portion and said lower edge portion in the manner of an open seat, and faces outward along said radial axis and positioned on a reaction device associated with the caliper body;
said spring surface is an undercut surface with respect to the upper edge portion;
said tab forming said seat defining said spring surface includes a bracket which protrudes in a cantilever from said support plate; and
throughout said upper edge portion only tabs forming said seat defining said spring surface are present.

3. The brake pad of the disc brake according to claim 1 , wherein:
said support plate is an axial-symmetric shape with respect to a median line parallel to the radial axis.

4. The brake pad of the disc brake according to claim 1 , wherein:
said upper edge comprises two tabs per spring;
along the entire longitudinal extension of said upper edge no other tabs are present with the exception of recesses for wear sensors of the friction portion of the pad;
said two tabs are folded towards each other so that the seats are mutually facing; and
said two tabs are folded in opposite directions so that the seats are opposite each other.

5. The brake pad of the disc brake according to claim 1 , wherein:
said spring surface comprises at least one section directed along the tangential axis;
said spring surface comprises at least one inclined portion with respect to the tangential axis deflecting away from said tangential axis outward toward the radial axis, opening an angle towards the radial axis between 30 DEG and 50 DEG;
said lower edge portion is devoid of any spring surface;
said lower lateral edge sub-portion is devoid of any spring surface;
said tab forming said seat defining said spring surface is placed in proximity of an edge between said upper edge portion and said lateral edge portion;
said spring surface is facing said upper edge portion positioned alongside a portion of friction material; and
said seat defining said spring surface is a closed seat.

6. The brake pad of the disc brake according to claim 1 , wherein:
said lower caliper body support portion of the support plate, defining a caliper support surface supporting the support plate on the caliper body to exert an outward reaction to the thrust component relative to the stress action of the spring device, is made in a support tab;
said support tab protrudes in a cantilever from said lower lateral edge sub-portion;
said support tab protrudes along the tangential axis away from said friction portion;
said support tab forms a cantilever bracket defining externally the caliper support surface supporting the support plate of the caliper body;
said support tab forms a cantilever bracket defining at least partially internally the caliper support surface supporting the support plate of the caliper body;
said support surface is a slot for supporting a portion of a pin;
said brake pad is provided with at least one eyelet to receive corresponding pins of the caliper, wherein said pins define pin profiles and said eyelets define eyelet profiles, said pin profiles having at least one curved pin contact portion with pin curvature radii and said eyelet profiles having at least one curved eyelet contact portion with eyelet curvature radii, so that contact between the brake pad and the pins can take place at least partially at said at least one curved pin contact portion and at least one curved eyelet contact portion, wherein the eyelet curvature radii are greater than the pin curvature radii;
said eyelet profiles have a rectangular shape with a rounded top outer corner, a bottom outer corner, a bottom inner corner and a top inner corner, at least one rounded corner forming said at least one curved eyelet contact portion;
said eyelet profiles of each eyelet have only one of said at least one curved pin contact portion positioned at said rounded bottom outer corner; and
a ratio between a height of each eyelet and the radius of eyelet curvature of said at least one curved eyelet contact portion is in the range 2 to 2.1.

7. The brake pad of the disc brake according to claim 1 , further comprising a brake disc assembly comprising a brake disc caliper operable to house the brake pad.

8. The brake pad of the disc brake according to claim 7 , further comprising a spring device for pulling the brake pad outwardly, the spring device including:
a spring device body;
said spring device body comprises a coupling portion to detachably couple the spring device to the caliper body; and
said spring device body comprising a pad thrust portion to influence said brake pad pulling the brake pad outward and to at least influence the brake pad away from the disc;
wherein said pad thrust portion comprises at least one thrust surface, which in the operating position, is directed substantially in the outward radial direction.

9. A brake pad of a disc brake housed in a caliper body having a caliper support plate and for resting on a disc, the brake pad comprising:
a support plate having a thrust surface;
a friction sur

Assignees

• Freni Brembo Spa

Inventors

• Crippa Cristian
• Scotti Fabio
• Castellana Mirko

Classifications

• F16D65/12

  Discs; Drums for disc brakes · CPC title

• F16D55/2265

  the axial movement being guided by one or more pins {engaging bores in the brake support or the brake housing} · CPC title

• F16D65/0977 Primary

  Springs made from sheet metal · CPC title

• F16D2055/0041

  Resilient elements interposed directly between the actuating member and the brake support, e.g. anti-rattle springs · CPC title

• F16D65/0006

  Noise or vibration control · CPC title