Duo two leading type drum brake device
AssigneeNisshinbo Industries, Inc.
InventorTakashi Ikeda
Life of this patent
Estimating the term…
Abstract
A small diameter duo two leading type drum brake that can mount a built-in parking brake mechanism. The brake has a link mechanism that includes a pivot lever that is rotatably and pivotally supported at a central region of a first brake shoe. A first strut is provided between a first end of a pivot lever and a second brake shoe. A second strut is substantially parallel to the first strut and is provided between the second end of the pivot lever and the second brake shoe. A parking brake actuator is provided to activate the link mechanism to open the pair of first and second brake shoes. A service brake actuator has an automatic shoe clearance adjustment device and one of the first and second struts has an automatic parking stroke adjustment device.
Claims12
A duo two leading type drum brake device, comprising:
- a back plate;
- a pair of service brake actuators;
- a pair of brake shoes that face each other on said back plate and have a service brake actuator of said pair of service brake actuators between each pair of adjacent ends of said pair of brake shoes;
- an automatic shoe clearance adjustment device, which extends itself in response to an excessive opening of each of said first and second brake shoes upon operation of a service brake and automatically adjusts a clearance between a brake drum and each of said first and second brake shoes, that is provided in each service brake actuator of said pair of service brake actuators;
- wherein
- a pivot lever that is rotatably supported longitudinally at a central region of a first brake shoe of said pair of brake shoes;
- a first strut is provided between a first end of said pivot lever and a second brake shoe of said pair of brake shoes:
- a second strut parallel to said first strut is provided between a second end of said pivot lever and said second brake shoe;
- a parking brake actuator comprising of a brake lever and positioned so as to activate a link mechanism that includes said pivot lever and said first and second struts, upon operation of a parking brake, spread open said pair of brake shoes through an engagement with said link mechanism;
- and
- an automatic parking stroke adjustment device, which extends in response to an excessive opening of both of said first and second brake shoes and automatically adjusts a stroke amount of said parking brake actuator, is provided on at least one of said first and second struts.
Dependencies are inferred from the claim text.