Fluid cooled disc brake for bicycle

A bicycle disc brake caliper, comprising;

• a housing with a frame mounting member sized to be coupled to a portion of a bicycle frame;
• a piston unit movably coupled to said housing between a release position in which said piston unit is spaced from a brake disc mounted to a wheel of a bicycle and a braking position in which said piston unit engages the brake disc of the bicycle wheel;
• and
• a coolant member coupled to said housing, said coolant member having a coolant area for receiving coolant to create a coolant heat sink that transfers heat from said housing,
• said housing including an actuating passage in fluid communication with said piston unit to move said piston unit via an actuating fluid,
• said housing having a disc receiving slot extending through said piston unit to receive the brake disc therein, said slot having an upstream end and a downstream end such that the brake disc rotates from said upstream end to said downstream end, said coolant member being formed as a single large coolant chamber that concentrates coolant in an position located adjacent said downstream end of said slot.

A bicycle disc brake assembly, comprising:

• a bicycle brake operating device with a mounting member adapted to be coupled to a portion of a bicycle, said bicycle brake operating device having a master piston movably located in a master cylinder;
• an actuation fluid reservoir in fluid communication with said master cylinder;
• a caliper housing with a frame mounting member sized to be coupled to a portion of a bicycle frame, said caliper housing includes an actuating passage in fluid communication with said master cylinder via a conduit;
• and
• a piston unit movably coupled to said caliper housing and in fluid communication with said actuating passage to move said piston unit between a release position in which said piston unit is spaced from a brake disc mounted to a wheel of a bicycle and a braking position in which said piston unit engages the brake disc of the bicycle wheel,
• said caliper housing including an actuating conduit in fluid communication with said piston unit to move said piston unit via an actuation fluid, and a coolant member coupled to said caliper housing, said coolant member having an inlet opening and an outlet opening in fluid communication with a coolant area for receiving coolant to create a coolant heat sink that transfers heat from said caliper housing,
• said housing including a first housing half having a first cavity with a first cavity opening forming a first portion of said cooling area therein and a second housing half with a second cavity with a second cavity opening forming a second portion of said cooling area therein, said first and second cavities of said cooling area having outer peripheries that are substantially equal to said first and second cavity openings of said cooling area to form a single large coolant chamber such that coolant is located in a single concentrated area between said first and second housing halves.

A bicycle disc brake assembly, comprising:

• a bicycle brake operating device with a mounting member adapted to be coupled to a portion of a bicycle said bicycle, brake operating device having a master piston movably located in a master cylinder;
• an actuation fluid reservoir in fluid communication with said master cylinder;
• a caliper housing with a frame mounting member sized to be coupled to a portion of a bicycle frame, said caliper housing includes an actuating passage in fluid communication with said master cylinder via a conduit;
• and
• a piston unit movably coupled to said caliper housing and in fluid communication with said actuating passage to move said piston unit between a release position in which said piston unit is spaced from a brake disc mounted to a wheel of a bicycle and a braking position in which said piston unit engages the brake disc of the bicycle wheel,
• said caliper housing including an actuating conduit in fluid communication with said piston unit to move said piston unit via an actuation fluid, and a coolant member coupled to said caliper housing, said coolant member having a coolant area for receiving coolant to create a coolant heat sink that transfers heat from said caliper housing,
• said caliper housing having a disc receiving slot extending through said piston unit to receive the brake disc therein, said slot has an upstream end and a downstream end such that the brake disc rotates from said upstream end to said downstream end, said coolant member being formed as a single large coolant chamber that concentrates coolant in an position located adjacent said downstream end of said slot.