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US 6,883,648 B2Granted
Mechanical disk brake for a bicycle
AssigneeNational Science Council
InventorsChang-Hua Feng, Te-Sheng Tseng, Su-Hsien Liao
Life of this patent
Estimating the term…
Abstract
A mechanical disk brake for a bicycle is characterized in a thrust bearing included in a cam mechanism thereof to overcome the problem of a locked disk brake due to an overly large friction as frequently occurs in conventional mechanical disk brakes, and an eccentric force-application arm with an improved geometrical shape to create different arms of force that enables production of an enhanced tail braking force for the mechanical disk brake. The problem of largely reduced braking force occurs in conventional rim brakes in bad weather or in braking over a prolonged time, and the problem of self-locking frequently occurs in the conventional mechanical disk brakes.
Claims23
A mechanical disk brake for reducing speed of a bicycle in moving, comprising:
- a torque output assembly including an eccentric force-application arm that works with a return spring and a steel cord guiding and locating pin to create different arms of force and convert a pull force of said steel cord into a torque, and a main fixing case to which said eccentric force-application arm and many other parts and components of said disk brake are mounted at predetermined positions, so that said disk brake could be mounted on a front fork of a bicycle;
- a cam mechanism including a thrust bearing, a rotor-driving shaft, two rotors, and a camshaft;
- said rotor-driving shaft being used to push said two rotors for the same to act on a slant surface of said camshaft, so that said camshaft moves in an axial motion like a piston, and said thrust bearing being adapted to avoid a locked disk brake;
- a return mechanism including a leaf spring set between two axially spaced brake linings, said leaf spring providing an elastic force for said two brake linings to return to their initial position from a braked position;
- and
- a wear compensation means including a bolt that could be turned and thereby moved toward said brake linings to compensate any portion of said brake linings that has been worn off;
- said mechanical disk brake for a bicycle being characterized in that said rotor-driving shaft is connected to said eccentric force-application arm with a screw, such that said eccentric force-application arm converts the pull force of said steel cord into a torque to rotate said rotor-driving shaft, causing said two rotors mounted on said rotor-driving shaft to rotatably contact with said slant surface of said camshaft and thereby bring said camshaft to move in axial motion like a piston, said camshaft in axial motion being adapted to push one of said two brake linings toward the other one and thereby tightly clamp a brake disk disposed between said two brake linings to create a braking effect;
- and that said rotors are precisely located in two rotor locating openings on said rotor-driving shaft to enable easily controllable application of force to actuate said disk brake;
- wherein said eccentric force-application arm is provided along a circumferential periphery with a steel cord guide groove for receiving said steel cord therein and preventing said steel cord from moving out of said eccentric force-application arm, and at a lower portion with a screw locating hole for firmly holding a head of said steel cord therein with a screw.
6 more elements
A mechanical disk brake for reducing speed of a bicycle in moving, comprising:
- a torque output assembly including an eccentric force-application arm that works with a return spring and a steel cord guiding and locating pin to create different arms of force and convert a pull force of said steel cord into a torque, and a main fixing case to which said eccentric force-application arm and many other parts and components of said disk brake are mounted at predetermined positions, so that said disk brake could be mounted on a front fork of a bicycle;
- a cam mechanism including a thrust bearing, a rotor-driving shaft, two rotors, and a camshaft;
- said rotor-driving shaft being used to push said two rotors for the same to act on a slant surface of said camshaft, so that said camshaft moves in an axial motion like a piston, and said thrust bearing being adapted to avoid a locked disk brake;
- a return mechanism including a leaf spring set between two axially spaced brake linings, said leaf spring providing an elastic force for said two brake linings to return to their initial position from a braked position;
- and
- a wear compensation means including a bolt that could be turned and thereby moved toward said brake linings to compensate any portion of said brake linings that has been worn off;
- said mechanical disk brake for a bicycle being characterized in that said rotor-driving shaft is connected to said eccentric force-application arm with a screw, such that said eccentric force-application arm converts the pull force of said steel cord into a torque to rotate said rotor-driving shaft, causing said two rotors mounted on said rotor-driving shaft to rotatably contact with said slant surface of said camshaft and thereby bring said camshaft to move in axial motion like a piston, said camshaft in axial motion being adapted to push one of said two brake linings toward the other one and thereby tightly clamp a brake disk disposed between said two brake linings to create a braking effect;
- and that said rotors are precisely located in two rotor locating openings on said rotor-driving shaft to enable easily controllable application of force to actuate said disk brake;
- wherein said thrust bearing of said cam mechanism is adapted to prevent said rotors and said slant surface on said camshaft from locking to each other;
- said rotor-driving shaft being adapted to convert a torque of said eccentric force-application arm into a force to rotate said rotors;
- said two rotors in rotating being adapted to push said camshaft to move in axial motion like a piston;
- and said camshaft pushed by said rotors being adapted to push said two brake linings to tightly clamp the brake disk disposed between them to achieve a braking effect;
- wherein said rotor-driving shaft includes a hollow locating shaft having an internally threaded portion, said rotor-driving shaft being connected to said eccentric force-application arm by extending said hollow locating shaft into a fixing hole on said eccentric force-application arm and engaging said screw with said internally threaded portion of said hollow locating shaft;
- and said hollow locating having shaft non-threaded portion opposite to said internally threaded portion for receiving a locating shaft of said camshaft therein.
11 more elements
Dependencies are inferred from the claim text.