DISC BRAKES

• US 3,708,043 A
• Filed: 09/22/1970
• Issued: 01/02/1973
• Est. Priority Date: 09/25/1969
• Status: Expired due to Term

• Current Assignee: Heinrich Bernhard Rath, Wolfgang Hess
• Original Assignee: Heinrich Bernhard Rath, Wolfgang Hess
• Inventors: Rath, Heinrich Bernhard, Hess, Wolfgang
• Primary Examiner(s): Halvosa, George E. A.
• Application Number:
  US05/074,328
• Time in Patent Office: 833 Days
• Field of Search: 188/73.1,25B,72.4,72.5,73.3,73.6
• US Class Current: 188/73.46
• CPC Class Codes: F16D 55/228 with a separate actuating member for each side

Abstract

A spot-type disc brake has a fixed caliper straddling the disc and containing hydraulic actuator pistons acting on the back plates of opposed brake pads disposed at opposite sides of the disc. The back plates have '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"' shaped side edge portions whose circumferentially inwardly facing surfaces cooperate with circumferentially outwardly facing abutment surfaces on the caliper. This enables the brake drag forces to be taken from the brake pads at their leading edges.

Claims

1. A spot-type disc brake comprising a caliper adapted to straddle a disc rotatable about a rotary axis, a pair of opposed brake pad assemblies located in the caliper, each pad assembly having a back plate and a brake pad thereon, actuator means adapTed to urge the brake pads of the pad assemblies against opposite faces of the disc, and means for sustaining brake drag forces from the leading side only of said pad assemblies considering the rotation of said disc, said last named means comprising first and second radially spaced pairs of circumferentially spaced abutment surfaces on each of said back plates, said pairs being on the radially outer and inner sides respectively of the line of action of the braking drag force acting on the respective pads when the latter are urged against a rotating disc, the abutment surfaces of each pair mutually facing inwardly, a non-rotatable drag force sustaining member having first and second parts spaced apart axially with respect to the rotating axis of the disc, first and second separate pairs of circumferentially spaced abutment surfaces disposed on each of the parts of the drag force sustaining member on the radially outer and inner sides respectively of said line of action, the abutment surfaces of each pair mutually facing outwardly and being complementary to and cooperating with the respective first and second pairs of abutment surfaces on the respective back plates, said cooperating abutments sustaining the braking forces at the leading side of said pad assembly on both sides of the line of action of the braking forces throughout the life of the pads.

2. A disc brake according to claim 1 in which said abutment surfaces are flat and are perpendicular to said line of action.

3. A disc brake according to claim 1 in which the drag force sustaining member comprises portions of said caliper.

4. A disc brake according to claim 3 in which said caliper comprises a fixed caliper.

5. A disc brake according to claim 4 in which said actuator means comprise cylinders in opposite limbs of said caliper and pistons slidable in said cylinders.

6. A disc brake according to claim 5 in which said pad assemblies have recesses therein and said pistons have projections thereon extending into said recesses to radially locate said pad assemblies.

7. The spot-type disc brake of claim 1 wherein each back plate has side edge portions disposed circumferentially of its brake pad, said first and second pairs of abutment surfaces extending radially outwardly and inwardly respectively from said side edge portions.

8. The disc brake of claim 7 in which said side edge portions are T-shaped, said abutment surfaces being defined by the inner faces of the limbs of the T-shaped parts of said side edge portions.

9. A disc brake according to claim 8 in which the abutment surfaces on said non-rotatable drag sustaining member include radially inwardly and outwardly facing locating surfaces constructed and arranged to cooperate with the extremities of said limbs of said T-shaped side edge portions to radially locate said pad assemblies.

10. A disc brake according to claim 9 in which the radially inwardly and outwardly facing surfaces on the extremities of said limbs are parallel to said line of action and cooperate with said locating surfaces.