Hidden hydraulic structure of bike disc brake

1. A hidden hydraulic structure of a bike disc brake connected with a bike body tube, the hidden hydraulic structure of the bike disc brake comprising a base, piston and a linking member, wherein the base comprises an oil circuit, the piston is disposed in the base for controlling a pressure of the oil circuit, the piston is actuated by the linking member;

wherein a shape of an exposed portion of the base is corresponded to a shape of the bike body tube, and the base is detachably connected with the bike body tube to form a complete structure and shape of the bike body tube, thereby increasing strength of the body tube;

wherein the bike body tube comprises two handlebar tubes, the two handlebar tubes are symmetrically connected at two opposite sides of the base, and the linking member is hidden in the handlebar tubes.

2. The hidden hydraulic structure of the bike disc brake of claim 1 , wherein the bike body tube comprises an accommodating space, and the base is detachably disposed in the accommodating space; and the linking member directly connects to the piston and actuates the piston.

3. The hidden hydraulic structure of the bike disc brake of claim 2 , wherein the accommodating space is closed or opened.

4. The hidden hydraulic structure of the bike disc brake of claim 1 , wherein the bike body tube comprises a head tube, a bar end tube, a stem tube, a top tube, a middle tube, a down tube, a front fork tube or a rear stay tube.

5. The hidden hydraulic structure of the bike disc brake of claim 1 , further comprising a controlling handle connecting and controlling the linking member.

6. A hidden hydraulic structure of a bike disc brake, comprising:

a bike body tube having an accommodating space, wherein the bike body tube comprises two handlebar tubes located at two opposite sides, and the accommodating space is located in a center position of the bike body tube;

a base detachably assembled into the accommodating space and having a shape correspondent to a shape of the accommodating space, wherein the base comprises an oil circuit and at least one positioning portion, and the positioning portion of the base is positioned in the accommodating space, the base fully fills a surface of the accommodating space for increasing strength of the bike body tube;

a piston disposed in the base for controlling a pressure of the oil circuit; and

a linking member connected to the piston, and the linking member actuating the piston and being hidden in the handlebar tubes.

7. The hidden hydraulic structure of the bike disc brake of claim 6 , wherein the accommodating space is closed or opened.

8. The hidden hydraulic structure of the bike disc brake of claim 6 , wherein the accommodating space has a screw base, the positioning portion has a lock hole, and a screw is passed through the lock hole and is screwed to the screw base.

9. The hidden hydraulic structure of the bike disc brake of claim 6 , wherein the bike body tube comprises a head tube, a bar end tube, a stem tube, a top tube, a middle tube, a down tube, a front fork tube or a rear stay tube.

10. The hidden hydraulic structure of the bike disc brake of claim 6 , wherein,

two oil circuits are disposed in the base;

two pistons are disposed in the base for controlling the pressures of the two oil circuits respectively;

two linking members are directly connected to the two pistons, and the two linking members actuate the two pistons respectively;

two oil tubes are connected to the two oil circuits respectively; and

two disc braking units are connected to the two oil tubes respectively, and the two disc braking units are for braking a front wheel and a rear wheel respectively.

11. The hidden hydraulic structure of the bike disc brake of claim 6 , wherein,

a number of the bike body tube is two, the two bike body tubes have two opposite openings, and two accommodating spaces are located in the two openings respectively; and

the base is connected between the two openings.

12. A hidden hydraulic structure of a bike disc brake, comprising:

a bike body tube having an accommodating space;

a base connected to the bike body tube and having a shape correspondent to a shape of the accommodating space, wherein the base comprises an oil circuit and at least one positioning portion, and the positioning portion of the base is positioned in the accommodating space, the base fully fills a surface of the accommodating space for increasing strength of the bike body tube;

a piston disposed in the base and controlling a pressure of the oil circuit;

a linking member connected to the piston, and the linking member actuating the piston; and

a controlling handle connecting and controlling the linking member;

wherein the body tube comprises two handlebar tubes, and the base and the linking member are hidden in the handlebar tubes.

13. The hidden hydraulic structure of the bike disc brake of claim 12 , wherein the accommodating space is close or open.

14. The hidden hydraulic structure of the bike disc brake of claim 12 , wherein the accommodating space has a screw base, the positioning portion has a lock hole, and a screw is passed through the lock hole and is screwed to the screw base.

15. The hidden hydraulic structure of the bike disc brake of claim 12 , wherein,

two oil circuits are disposed in the base;

two pistons are disposed in the base for controlling the pressures of the two oil circuits respectively;

two linking members are directly connected to the two pistons, and the two linking members actuate the two pistons respectively;

two oil tubes are connected to the two oil circuits respectively; and

two disc braking units are connected to the two oil tubes respectively, and the two disc braking units are for braking a front wheel and a rear wheel of respectively.