Drum brakes
AssigneeAutomotive Products Italia (SV) s.r.l.
InventorsMarco Monopoli, Ivan Cecchelli
Life of this patent
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Abstract
A drum brake (10) is provided which has a pair of brake pads (12), each pad being moveable generally radially outwardly into contact with a brake drum by a respective operating lever (14) which is acted on at one end by a brake applying means (15) and pivoted (16) at the other end from a backplate (11). Each pad is contacted by a portion (14c) of the respective operating lever intermediate the lever ends and is moved radially outwardly between a pair of circumferentially spaced abutments (45) which extend generally perpendicular to the backplate (11) and which react braking torque when the brake is applied. The required pad to drum clearance is established by knock-back of the drum on the pads (12).
Claims13
A drum brake without brake pad retraction springs comprising:
- a pair of brake pads, each pad being moveable generally radially outwardly into contact with a brake drum by a respective operating lever acted on at one end by a brake applying means and pivoted at the other end from a backplate, each pad being contacted by a portion of the respective operating lever that is intermediate to the lever ends and moving radially outwardly between a pair of circumferentially spaced abutments which extend generally perpendicular to the backplate, wherein when the brake is released, a constant pad to drum clearance is maintained solely by knock-back of the drum on the pads.
A drum brake comprising:
- brake pads,
- two operating levers each associated with one of said brake pads,
- a handbrake lever arranged for movement on a backplate in which the handbrake lever is pivoted on one end of one of the operating levers, and
- a strut extends between said handbrake lever and the other operating lever so that pivoting of the handbrake lever relative to said one of the operating levers moves said other operating lever towards the brake pad that is associated with said other operating lever and thus, by reaction through the strut, also moves said one of the operating levers towards the brake pad that is associated with said one of the operating levers, thus applying the brake to provide a hand/parking brake function,
- wherein a pad to drum clearance is established without pad retraction springs solely by knock-back of the drum on the brake pads.
Dependencies are inferred from the claim text.