Master cylinder apparatus
A master cylinder apparatus A 1 includes a master cylinder 1 and a reservoir 3 . The master cylinder 1 transduces an input to a brake operator into a brake fluid pressure. The reservoir 3 includes a fluid supply hole 3 a that is connected to the master cylinder 1 . A base body 10 of the master cylinder 1 includes a first cylinder hole 11 a into which a piston is inserted, a reservoir union port 13 a to which the fluid supply hole 3 a is connected, and a communication hole 13 d . The communication hole 13 d has one end opening in a bottom surface of the reservoir union port 13 a , and the other end opening in an inner circumferential surface of the first cylinder hole 11 a . A center axis O 3 of the reservoir union port 13 a passes through a position being apart from a center axis O 1 of the first cylinder hole 11 a.
1. A master cylinder apparatus comprising:
a master cylinder that transduces an input to a brake operator into a brake fluid pressure; and
a reservoir including a fluid supply hole that is connected to the master cylinder, wherein
a base body of the master cylinder includes
a master-cylinder hole into which a piston is inserted,
a reservoir union port to which the fluid supply hole is connected, and
a communication hole having
one end opening in a bottom surface of the reservoir union port, and
the other end opening in an inner circumferential surface of the master-cylinder hole, and
a center axis of the reservoir union ports passes through a position being apart from a center axis of the master-cylinder hole.
2. The apparatus of claim 1 , wherein when the bottom surface of the reservoir union port and the master-cylinder hole are projected onto a projection plane a normal line of which is the center axis of the reservoir union port, at least a part of the bottom surface of the reservoir unit port overlaps with the master-cylinder hole.
3. The apparatus of claim 2 , further comprising:
a housing being attached to the base body, wherein
the center axis of the reservoir unit port is deviated from the center axis of the master-cylinder hole to an opposite side to a housing side.
4. The apparatus of claim 3 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.
5. The apparatus of claim 2 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.
6. The apparatus of claim 1 , wherein the communication hole extends along an axial direction of the reservoir union port and an upper end of the communication hole is directly connected and in fluid communication with a bottom of the reservoir union port and the lower end of the communication hole opens in an inner circumferential surface of the cylinder hole.
7. The apparatus of claim 6 , wherein a center axis of the communication hole passes through a position aligned with the center axis of the master-cylinder hole.
8. The apparatus of claim 7 , wherein a center axis of the communication hole is offset with respect to the center axis of the reservoir union ports.
9. The apparatus of claim 1 , wherein when the bottom surface of the reservoir union port and the master-cylinder hole are projected onto a projection plane a normal line of which is the center axis of the reservoir union port, the entire bottom surface of the reservoir unit port overlaps with the master-cylinder hole.
10. The apparatus of claim 9 , further comprising:
a housing being attached to the base body, wherein
the center axis of the reservoir unit port is deviated from the center axis of the master-cylinder hole to an opposite side to a housing side.
11. The apparatus of claim 10 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.
12. The apparatus of claim 9 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.
13. The apparatus of claim 1 , further comprising:
a housing being attached to the base body, wherein
the center axis of the reservoir unit port is deviated from the center axis of the master-cylinder hole to an opposite side to a housing side.
14. The apparatus of claim 13 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.
15. The apparatus of claim 1 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.
16. A master cylinder apparatus comprising:
a master cylinder that transduces an input to a brake operator into a brake fluid pressure;
a reservoir including a fluid supply hole that is connected to the master cylinder, wherein
a base body of the master cylinder includes
a master-cylinder hole into which a piston is inserted,
a reservoir union port to which the fluid supply hole is connected, and
a communication hole having
one end opening in a bottom surface of the reservoir union port, and
the other end opening in an inner circumferential surface of the master cylinder, and
a center axis of the reservoir union port and a center axis of the master-cylinder hole are skew lines.
17. The apparatus of claim 16 , wherein when the bottom surface of the reservoir union port and the master-cylinder hole are projected onto a projection plane perpendicular to the center axis of the reservoir union port, at least a part of the bottom surface of the reservoir unit port overlaps with the master-cylinder hole.
18. The apparatus of claim 16 , wherein when the bottom surface of the reservoir union port and the master-cylinder hole are projected onto a projection plane perpendicular to the center axis of the reservoir union port, the entire bottom surface of the reservoir unit port overlaps with the master-cylinder hole.
19. The apparatus of claim 16 , further comprising:
a housing that stores a part, the housing being attached to the base body, wherein
the center axis of the reservoir unit port is deviated from the center axis of the master-cylinder hole to an opposite side to a housing side.
20. The apparatus of claim 16 , wherein
the base body includes a stroke simulator that generates a pseudo operational reaction force to be applied to the brake operator, and
a center axis of an opening portion of the reservoir union port is deviated from the center axis of the master-cylinder hole to a stroke-simulator side.