ANTI-RATTLE DEVICE FOR A DISC BRAKE

• US 3,710,896 A
• Filed: 11/09/1970
• Issued: 01/16/1973
• Est. Priority Date: 11/09/1970
• Status: Expired due to Term

• Current Assignee: Wagner Electric Corp. (Studebaker Electric Co.)
• Original Assignee: John A. Machek
• Inventors: Machek, John A.
• Primary Examiner(s): Halvosa, George E. A.
• Application Number:
  US05/087,973
• Time in Patent Office: 799 Days
• Field of Search: 188/73.5,73.4,72.4,25A
• US Class Current: 188/73.36
• CPC Class Codes: F16D 55/2262 the axial movement being guided by open sliding surfaces, e.g. grooves
• CPC Class Codes: F16D 65/0975 Springs made from wire

Abstract

An anti-rattle or biasing member is biased between the caliper and the inboard and outboard brake shoes of a caliper type disc brake respectively urging said caliper and brake shoes toward anti-rattling engagement with the brake support member which defines a closed loop substantially about the disc of said brake.

Claims

1. In a friction device for use with a rotatable disc having support means defining a closed loop substantially about a chordal sector of said disc, a pair of brake shoes for frictional engagement with the opposed sides of said disc, caliper means axially movable on said support means and straddling at least a portion of said disc including a fluid pressure portion and a reaction portion adjacent said disc opposed sides and drivingly engaged with said brake shoes to effect the frictional engagement thereof with said disc opposed sides, respectively, and antirattle means comprising at least one spring member having a central body portion, a pair of spaced arms each having one end integrally connected to the central body portion at opposite ends thereof to extend out transversely from said central body portion, said arms being bent backwardly toward themselves to extend in toward said central body portion to form a resilient spring at the bend, attachment means connected at a second end of each of said arms in position spaced away from said bend and in the direction of said central body portion, each Of said attachment means being releasably connected directly to at least one of said caliper means and loop member at spaced points in a displacement preventing engagement with at least one of said caliper means and loop member and said central body portion being engaged to bear against an end portion of said brake shoes in position to bias the resilient spring of the arms to urge at least one of said caliper means and brake shoes toward antirattle abutment with said loop member.

2. In a friction device for use with a rotatable disc, support means mounted adjacent to one of the opposed sides of said disc including a member defining a closed loop about substantially a chordal sector of said disc, a pair of friction members for frictional engagement with said disc opposed sides, respectively, caliper means axially movable on said loop member and straddling at least a portion of the disc periphery including a fluid motor portion and a reaction portion respectively adjacent to said disc opposed sides and engaged with said friction members to effect axial movement thereof into frictional engagement with said disc opposed sides upon actuation of said fluid motor portions, respectively, a first pair of opposed anchor means on said fluid motor portion, a second pair of opposed anchor means on said reaction portion, said first and second pairs of anchor means extending in planes substantially normal to said disc sides plane, respectively, said friction members each including a backing plate having a central portion interposed between opposed end portions, friction material supported on said backing plate adjacent to said central portion and adapted for frictional engagement with said disc opposed sides, a pair of extension means on said backing plate integrally connected with said opposed end portions, said pair of extension means on the backing plate of one of said friction members embracing said first pair of anchor means and said pair of extension means on the backing plate of the other of said friction members embracing said second pair of anchor means, respectively, leading and trailing anchor surfaces on said extension means of said one and other friction members in facing relation and extending in planes substantially normal to said backing plates thereof, said leading anchor surfaces of said one and other friction members being engaged in brake torque transfer relation with one anchor means of said first and second anchor means pairs, wherein said leading anchor surfaces are urged into anchoring engagement with one anchor means of said first and second anchor means pairs to transfer thereto brake torque in the direction of disc rotation, a pair of supporting surfaces on said extension means of said one and other friction members substantially normal to the planes of said backing plate and said leading and trailing anchor surfaces thereof and in sliding and abutting engagement with said loop member, respectively, one of said supporting surfaces of said one and other friction members being urged into abutting engagement with said loop member to establish a reaction force supporting one of said extension means of said one and other friction members against deflection in response to the brake torque acting on said leading anchor surfaces thereof, and a pair of notches in said extension means of said one and other friction members adjacent to said leading and trailing anchor surfaces thereof, respectively, and anti-rattle means comprising a pair of spring means, each of said spring means including an intermediate member extending in a generally axial direction across the disc periphery and engaged with said notches in the adjacent opposed extensions of said one and other friction members and also engaged with said one and the other of said anchor means of said first and second anchor means pairs, a pair of spaced arms integral with said intermediate members and adjacent to the adjacent opposed extensions of said one and other friction members and said caliper pressure And reaction portions, said arms being generally normal to said intermediate member and extending away from said one and other anchor means of said first and second anchor means pairs, a pair of resilient portions integral with said arms and having a generally U-shaped configuration, another pair of arms integral with said resilient portions and extending generally transversely with said first named pair of arms toward said caliper fluid motor and reaction portions, and a pair of tab means on said other pair of arms defining the free ends thereof and extending generally in the same direction as said intermediate member, respectively, and said caliper fluid motor and reaction portions respectively including means receiving said tab means in displacement preventing engagement therewith, said intermediate member urging said support surfaces of said one and other friction members in one direction into anti-rattling abutment with said loop member and said tab means urging said caliper fluid motor and reaction portions in another direction opposite to said one direction into anti-rattling abutment with said loop member in response to the inherent compressive force of said resilient portions, respectively.

3. In a friction device for use with a rotatable disc having support means defining a closed loop substantially about a chordal sector of said disc, a pair of brake shoes for frictional engagement with the opposed sides of said disc, caliper means axially movable on said support means and straddling at least a portion of said disc including a fluid pressure portion and a reaction portion adjacent said disc opposed sides and drivingly engaged with said brake shoes to effect the frictional engagement thereof with said disc opposed sides, respectively, and anti-rattle means comprising at least one spring member having a central body portion, a pair of spaced arms each having one end integrally connected to the central body portion at opposite ends thereof to extend out transversely from said central body portion, said arms being bent backwardly toward themselves to extend in toward said central body portion to form a resilient spring at the bend, attachment means connected at a second end of each of said arms in position spaced away from said bend and in the direction of said central body portion, each of said attachment means being releasably connected to said caliper means at spaced points in a displacement preventing engagement with said caliper means and said central body portion being engaged to bear against an end portion of said brake shoes in position to bias the resilient spring of the arms to urge said brake shoes and caliper means in opposite directions and into anti-rattle abutment with said loop member.

4. In a disc brake having support means including a member defining a closed loop substantially about a chordal sector of said disc, a pair of brake shoes for frictional engagement with opposed sides of said disc including opposed extension means slidable on said loop member, respectively, caliper means movable on said loop member and straddling at least a portion of said disc including a fluid pressure portion and a reaction portion adjacent said disc opposed sides and drivingly engaged with said brake shoes to effect substantially concerted movement thereof into frictional engagement with said disc opposed sides upon fluid pressure actuation of said caliper means, respectively, and anti-rattle means comprising at least one spring member having a central body portion, a pair of spaced arms each having one end integrally connected to the central body portion at opposite ends thereof to extend out transversely from said central body portion, said arms being bent backwardly toward themselves to extend in toward said central body portion to form a resilient spring at the bend, attachment means connected at a second end of each of said arms in position spaced away from said bend and in the direction of said central body portion, each of said attachment means bEing releasably connected directly to said loop member at spaced points in a displacement preventing engagement with said loop member and said central body portion being engaged to bear against the adjacent opposed extension means of said brake shoes in position to bias the resilient spring of the arms to urge said adjacent opposed extension means of said brake shoes into anti-rattling abutment with said loop member.

5. In a disc brake according to claim 4, wherein said central body portion includes a spring portion between said pair of spaced arms which is biased into engagement with said adjacent opposed extension means to transmit thereto substantially uniform biasing forces as the inboard one of said brake shoes is repositioned along said spring portion in a direction toward its disc opposed side in response to brake shoe wear.

6. In a disc brake having support means including a member defining a closed loop substantially about a chordal sector of said disc, a pair of brake shoes for frictional engagement with the opposed sides of said disc including opposed ends slidable on said loop member, respectively, caliper means movable on said loop member and straddling at least a portion of said disc including a fluid pressure portion and a reaction portion adjacent said disc opposed sides and drivingly engaged with said brake shoes to effect substantially concerted movement thereof into frictional engagement with said disc opposed sides upon fluid pressure actuation of said caliper means, respectively, and anti-rattle means comprising at least one spring member having a central body portion, a pair of spaced arms each having one end integrally connected to the central body portion at opposite ends thereof to extend out transversely from said central body portion, said arms being bent backwardly toward themselves to extend in toward said central body portion to form a resilient spring at the bend, attachment means connected at a second end of each of said arms in position spaced away from said bend and in the direction of said central body portion, each of said attachment means being connected to at least one of said caliper means and brake shoes and said central body portion being engaged to bear against at least one of said caliper means and the adjacent opposed ends of said brake shoes in position to bias the resilient spring of the arms and urge said brake shoes and caliper member in opposite directions and into anti-rattle engagement with said loop member, respectively.

7. In a disc brake according to claim 6 wherein the said attachment means are connected to the caliper means at spaced points which separate the arms relative to the length of said central body portion to provide a bias between the attachment means and a displacement preventing engagement with said caliper means.

8. In a disc brake according to claim 6, wherein said central body portion extends across the periphery of said disc and is engaged with the adjacent opposed ends of said brake shoes, respectively.

9. In a disc brake according to claim 8, wherein said central body portion is permanently deflected in a direction toward biasing engagement with said brake shoes.