PLUGS AND HYDRAULIC DEVICE

Abstract

A plug comprises a first member and a second member. The first member is configured to be at least partially provided in a hole of a hydraulic device of a human-powered vehicle. The first member includes a communication hole. The second member is configured to change, in an attachment state in which the first member is at least partially provided in the hole of the hydraulic device, a state of the communication hole from an open state in which the hydraulic chamber communicates with the outside air via the communication hole to a closed state in which the communication hole is closed by the second member.

Description

TECHNICAL FIELD

[0001] The present invention relates to a plug and a hydraulic device. BACKGROUND INFORMATION

[0002] A human-powered vehicle (or a human-driven vehicle) includes a hydraulic device. Before a hose is attached to the hydraulic device, a plug is attached to the hydraulic device to restrict leakage of a fluid in a hydraulic chamber of the hydraulic device. However, in a case where a fluid is incompressible, it may be difficult to insert the plug into the hole in a state where the hydraulic chamber is filled with the fluid. Moreover, if the plug is pulled out from the hole in the state where the hydraulic chamber is filled with the fluid, the fluid may overflow or scatter. One of the objects of the present disclosure is to improve operability when attaching and / or detaching the plug to and / or from the hydraulic device. SUMMARY

[0003] According to a first aspect of the present invention, a plug comprises a first member and a second member. The first member is configured to be at least partially provided in a hole of a hydraulic device of a human-powered vehicle. The first member includes a communication hole. The second member is configured to change, in an attachment state in which the first member is at least partially provided in the hole of the hydraulic device, a state of the communication hole from an open state in which the hydraulic chamber is in communication with the outside air via the communication hole to a closed state in which the communication hole is closed by the second member.

[0004] In the plug according to the first aspect, the communication hole facilitates insertion or withdrawal of the first member into or from the hole in a state where a fluid is present in the opening. Furthermore, in the attachment state where the first member is at least partially provided in the hole of the hydraulic device, the second member changes the state of the communication hole from the open state to the closed state. In this way, it is possible to facilitate the handling of attaching and / or detaching the plug to and / or from the hydraulic device.

[0005] According to a second aspect of the present invention, the plug according to the first aspect is configured so that the communication hole includes a first end opening and a second end opening and extends from the first end opening to the second end opening.

[0006] In the plug according to the second aspect, the connection hole reliably facilitates insertion or removal of the first member into or from the hole in the state where the fluid is present in the hole. This can reliably improve the handling of attaching and / or detaching the plug to and / or from the hydraulic device.

[0007] According to a third aspect of the present invention, the plug according to the second aspect is configured such that the first end opening has a first inner diameter. The second end opening has a second inner diameter. The first member has a first outer length defined radially relative to the longitudinal central axis in a closed state in which the communication hole is closed by the second member. The second member has a second outer length defined radially relative to the longitudinal central axis in the closed state. At least one of the first outer length and the second outer length is different from at least one of the first inner diameter and the second inner diameter.

[0008] With the plug according to the third aspect, it is possible to improve the design flexibility of the first element and the second element.

[0009] According to a fourth aspect of the present invention, the plug according to the third aspect is arranged so that the first outer length is longer than at least one of the first inner diameter and the second inner diameter.

[0010] With the plug according to the fourth aspect, the design flexibility of the first and second components can be reliably improved.

[0011] According to a fifth aspect of the present invention, the plug according to the third or fourth aspect is arranged so that the second outer length is longer than at least one of the first inner diameter and the second inner diameter.

[0012] With the plug according to the fifth aspect, the design flexibility of the first element and the second element can be reliably improved.

[0013] According to a sixth aspect of the present invention, the plug according to any one of the third to fifth aspects is arranged so that the second outer length is shorter than the first outer length.

[0014] With the plug according to the sixth aspect, it is possible to reliably maintain the closed state.

[0015] According to a seventh aspect of the present invention, the plug according to the second aspect is configured such that the first end opening has a first inner diameter. The second end opening has a second inner diameter different from the first inner diameter.

[0016] With the plug according to the seventh aspect, it is possible to improve the design flexibility of the first member because the second inner diameter is different from the first inner diameter. Thus, it is possible to improve the handling of attaching and / or detaching the plug to and / or from the hydraulic device while simultaneously improving the design flexibility of the plug.

[0017] According to an eighth aspect of the present invention, the plug according to any one of the third to sixth aspects is arranged so that the second inner diameter is different from the first inner diameter.

[0018] With the plug according to the eighth aspect, it is possible to improve the design flexibility of the first member because the second inner diameter is different from the first inner diameter. Thus, it is possible to improve the handling of attaching and / or detaching the plug to and / or from the hydraulic device while simultaneously improving the design flexibility of the plug.

[0019] According to a ninth aspect of the present invention, a plug includes a first member. The first member is configured to be at least partially provided within a hole of a hydraulic device of a human-powered vehicle. The first member includes a communication hole. The communication hole includes a first end opening and a second end opening and extends from the first end opening to the second end opening. The first end opening has a first inner diameter. The second end opening has a second inner diameter different from the first inner diameter.

[0020] In the plug according to the ninth aspect, the connection hole facilitates insertion or withdrawal of the first member into or from the hole in the state where the fluid is present in the hole. Furthermore, since the second inner diameter is different from the first inner diameter, it is possible to improve the design flexibility of the first member. In this way, it is possible to improve the handling of attaching and / or detaching the plug to and / or from the hydraulic device while simultaneously improving the design flexibility of the plug.

[0021] According to a tenth aspect of the present invention, the plug according to any one of the seventh to ninth aspects is arranged so that the second inner diameter is larger than the first inner diameter.

[0022] With the plug according to the tenth aspect, the design flexibility of the first element can be reliably improved. This can improve the handling when attaching and / or detaching the plug to and / or from the hydraulic device, while reliably improving the design flexibility of the plug.

[0023] According to an eleventh aspect of the present invention, the plug according to any one of the seventh to tenth aspects is configured to taper the communication hole from the second end opening to the first end opening.

[0024] With the plug according to the eleventh aspect, it is possible to improve the productivity of the first element. Thus, it is possible to improve the handling of attaching and / or detaching the plug to and / or from the hydraulic device while simultaneously increasing the productivity of the first plug.

[0025] According to a twelfth aspect of the present invention, the plug according to any one of the second to eleventh aspects is configured so that the first member has an end face. The communication hole extends from the end face. The second member includes an insert and a stopper. The insert is configured to be at least partially provided in the communication hole. The stopper can be brought into contact with the end face in an inserted state in which the insert is at least partially provided in the communication hole.

[0026] With the plug according to the twelfth aspect, it is possible to stabilize the position of the second member relative to the first member. Thus, the handling during attachment and / or detachment of the plug to and / or from the hydraulic device can be improved, while reliably maintaining the closed state of the connection hole.

[0027] According to a thirteenth aspect of the present invention, a plug includes a first member and a second member. The first member is configured to be at least partially provided in a hole of a hydraulic device of a human-powered vehicle. The first member includes an end face and a communication hole extending from the end face. The second member is configured to close the communication hole. The second member includes an insert and a stopper. The insert is configured to be at least partially provided in the communication hole. The stopper is capable of being brought into contact with the end face in an inserted state in which the insert is at least partially provided in the communication hole.The communication hole is configured to connect a hydraulic chamber of the hydraulic device and the outside air in an attachment state in which the first member is at least partially provided in the hole of the hydraulic device and in an open state in which the second member is completely provided outside the communication hole.

[0028] In the plug according to the thirteenth aspect, the connection hole allows easy insertion or removal of the first member into or from the hole in a state where a fluid is present in the hole. Furthermore, it is possible to stabilize the position of the second member relative to the first member. In this way, it is possible to improve the attachment and / or detachment of the plug to and / or from the hydraulic device while reliably maintaining the closed state of the connection hole.

[0029] According to a fourteenth aspect of the present invention, the plug according to the twelfth or thirteenth aspect is arranged so that the plug is provided integrally with the insert as a one-piece, unitary element.

[0030] With the plug according to the fourteenth aspect, it is possible to simplify the structure of the second element. Thus, it is possible to improve the handling of attaching and / or detaching the plug to and / or from the hydraulic device while simultaneously simplifying the structure of the plug.

[0031] According to a fifteenth aspect of the present invention, the plug according to any one of the twelfth to fourteenth aspects is configured so that the communication hole has a longitudinal central axis and extends along the longitudinal central axis. The insert has a first length defined radially to the longitudinal central axis. The stopper has a second length defined radially to the longitudinal central axis. The second length is longer than the first length.

[0032] With the plug according to the fifteenth aspect, it is possible to reliably maintain the closed state of the connection hole.

[0033] According to a sixteenth aspect of the present invention, the plug according to any one of the twelfth to fifteenth aspects is configured so that the insert has an externally threaded portion. The connecting hole includes an internally threaded portion. The externally threaded portion is configured to engage with the internally threaded portion in a closed state in which the connecting hole is closed by the second member.

[0034] With the plug according to the sixteenth aspect, it is possible to maintain the closed state of the connection hole more reliably.

[0035] According to a seventeenth aspect of the present invention, the plug according to any one of the first to sixteenth aspects is adapted to allow the second member to be attached to the first member by press-fitting, adhesive bonding, or melting.

[0036] With the plug according to the seventeenth aspect, it is possible to maintain the closed state of the connection hole more reliably.

[0037] According to an eighteenth aspect of the present invention, the plug according to any one of the first to seventeenth aspects further includes a sealing member configured to be at least partially provided between the first member and an inner peripheral surface of the hole of the hydraulic device in the attached state.

[0038] In the plug according to the eighteenth aspect, it is possible to seal a gap existing between the first member and the inner peripheral surface of the hole by means of the sealing member.

[0039] According to a nineteenth aspect of the present invention, the plug according to the eighteenth aspect is configured so that the first member includes a groove. The sealing member is provided at least partially in the groove.

[0040] In the plug according to the nineteenth aspect, the groove stabilizes the position of the sealing element relative to the first element.

[0041] According to a twentieth aspect of the present invention, the plug according to any one of the first to nineteenth aspects is configured such that the first member is made of a first material. The second member is made of a second material. The second material is different from the first material.

[0042] With the plug according to the twentieth aspect, it is possible to improve the design flexibility of the first member and the second member compared with a case where the second material is the same as the first material.

[0043] According to a twenty-first aspect of the present invention, the plug according to the twentieth aspect is configured such that the first material includes a non-metallic material. The second material includes a metallic material.

[0044] The plug according to the twenty-first aspect can improve the rigidity of the second element.

[0045] According to a twenty-second aspect of the present invention, a hydraulic device comprises the plug according to any one of the first to twenty-first aspects and the hydraulic device. The hydraulic device includes the hydraulic chamber and the hole. The hydraulic chamber is configured to be filled with a fluid. The hole is configured to communicate with the hydraulic chamber.

[0046] With the plug according to the twenty-second aspect, the plug can maintain a state in which the hydraulic chamber is filled with the fluid when the hydraulic device is put into circulation. Thus, it is possible to improve the usability of the hydraulic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] A more complete understanding of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description taken in conjunction with the accompanying drawings. Fig. 1 is a side elevational view of hydraulic devices of hydraulic equipment and a hydraulic hose of a human-powered vehicle according to one of the embodiments. Fig. 2 is a cross-sectional view of a hydraulic device of the Fig. 1 illustrated hydraulic device. Fig. 3 is a cross-sectional view of a hydraulic device of the Fig. 1 illustrated hydraulic device. Fig. 4 is a partial cross-sectional view of the Fig. 1 illustrated hydraulic device and the hydraulic hose. Fig. 5 is a cross-sectional view of the Fig. 1 illustrated hydraulic hose. Fig. 6 is a cross-sectional view of a plug and the hydraulic device of the Fig. 1 illustrated hydraulic device. Fig. Figure 7 is a partial cross-sectional view of the plug and hydraulic device of the Fig. 1 illustrated hydraulic device. Fig. Figure 8 is a partial cross-sectional view of the plug and hydraulic device of the Fig. 1 (a state in which a second element is detached from a first element). Fig. 9 is a partial cross-sectional view of a first element and the hydraulic device of the Fig. 1 illustrated hydraulic device (comparative example). Fig. 10 is a partial cross-sectional view of the first element and the hydraulic device of the Fig. 1 (before the first element is inserted into a hole of the hydraulic device). Fig. 11 is a partial cross-sectional view of the hydraulic device and hydraulic hose of the Fig. 1 illustrated hydraulic device (while the hydraulic hose is inserted into the hole of the hydraulic device). Fig. 12 is a partial cross-sectional view of the hydraulic device and hydraulic hose of the Fig. 1 illustrated hydraulic device (a state in which the insertion of the hydraulic hose into the hole is completed). Fig. 13 is a cross-sectional view of a plug and the hydraulic device of the Fig. 1 illustrated hydraulic device. Fig. 14 is a cross-sectional view of a plug and the hydraulic device of the hydraulic apparatus according to a first modification. Fig. 15 is a cross-sectional view of a plug and the hydraulic device of the hydraulic apparatus according to a second modification. Fig. 16 is a cross-sectional view of a plug and the hydraulic device of the hydraulic apparatus according to a third modification. Fig. 17 is a cross-sectional view of a plug and the hydraulic device of the hydraulic apparatus according to a fourth modification. Fig. 18 is a cross-sectional view of a plug and the hydraulic device of the hydraulic apparatus according to a fifth modification. Fig. 19 to 21 are cross-sectional views of a plug and the hydraulic device of the hydraulic apparatus according to a sixth modification. DESCRIPTION OF THE EMBODIMENTS

[0048] The embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals designate corresponding or identical elements in the various drawings.

[0049] As in Fig. 1, a human-powered vehicle 2 includes a hydraulic device 10 and a hydraulic device 12. The hydraulic device 10 includes a hydraulic device 14. The hydraulic device 10 includes a hydraulic device 15. The hydraulic device 14 is configured to be connected to the hydraulic device 15 via a hydraulic hose 16. The hydraulic device 14 is configured to be operated using the hydraulic device 15. Namely, the hydraulic device 15 may also be referred to as an actuating device 15. However, the hydraulic device 15 is not limited to an actuating device.

[0050] In the present embodiment, the hydraulic device 14 comprises a hydraulic chamber 18. The hydraulic chamber 18 is configured to be filled with a fluid. The hydraulic device 15 contains a hydraulic chamber 20. The hydraulic chamber 20 is configured to be filled with a fluid. The hydraulic chamber 18 is configured to communicate or connect with the hydraulic chamber 20 via the hydraulic hose 16.

[0051] The hydraulic device 14 is configured for mounting on a vehicle body 4 of the human-powered vehicle 2. The hydraulic device 14 is configured for mounting on a frame 4A of the vehicle body 4. The hydraulic device 15 is configured for mounting on the vehicle body 4 of the human-powered vehicle 2. The hydraulic device 15 is configured for mounting on a handlebar 4B of the vehicle body 4. The hydraulic device 14 is configured to apply a braking force to a disc brake rotor 6 of the human-powered vehicle 2 in response to user operation of the hydraulic device 15. Namely, the hydraulic device 14 may also be referred to as a braking device 14. However, the hydraulic device 14 is not limited to a braking device.

[0052] In the present application, the term "human-powered vehicle" includes a vehicle that travels with a motive power that includes at least the human power of a user driving the vehicle. The human-powered vehicle includes various types of bicycles such as mountain bikes, racing bikes, city bikes, cargo bikes, handbikes, and recumbent bicycles. In addition, the human-powered vehicle also includes an electric bicycle, a so-called e-bike. The electric bicycle is an electrically assisted bicycle that supports the propulsion of a vehicle with an electric motor. However, the total number of wheels of the human-powered vehicle is not limited to two. The human-powered vehicle can, for example, also be a vehicle with one wheel or three or more wheels. In particular, the human-powered vehicle does not include a vehicle that uses only one power source as its motive power.Examples of power sources include an internal combustion engine and an electric motor. Generally, a light road vehicle that does not require a driver's license for use on public roads is considered a human-powered vehicle.

[0053] As in Fig. As can be seen in Figure 1, the hydraulic device 15 includes a housing 22. The housing 22 is adapted for mounting on the vehicle body 4. The housing 22 is adapted for mounting on the handlebar 4B of the vehicle body 4. The hydraulic chamber 20 is provided in the housing 22.

[0054] As in Fig. 2, the hydraulic device 15 includes a piston 24, a preloading element 25, a hydraulic reservoir 26 (see e.g. Fig. 1), an actuating element 28 and a mounting portion 29. The housing 22 is configured for coupling to the handlebar 4B via the mounting portion 29. The actuating element 28 is pivotally coupled to the housing 22. The housing 22 includes a chamber hole 30. The piston 24 is movably disposed in the chamber hole 30. The piston 24 is coupled to the actuating element 28 to move in response to the movement of the actuating element 28 relative to the housing 22. The biasing element 25 is provided in the chamber hole 30 to bias the piston 24 toward an initial position. The housing 22 and the piston 24 define the hydraulic chamber 20 in the chamber hole 30. The hydraulic reservoir 26 (see, e.g. Fig. 1) contains a storage chamber. The storage chamber is configured for communication or connection with the hydraulic chamber 20. The structure of the hydraulic device 15 is not limited to the illustrated structure.

[0055] As in Fig. As can be seen in Figure 1, the hydraulic device 14 includes a housing 32. The housing 32 is adapted for mounting on the vehicle body 4. The housing 32 is adapted for mounting on the frame 4A of the vehicle body 4. The hydraulic chamber 18 is provided in the housing 32.

[0056] As in Fig. As can be seen in Figure 3, the hydraulic chamber 18 includes a first hydraulic chamber 18A and a second hydraulic chamber 18B. The first hydraulic chamber 18A is configured to be filled with the fluid. The second hydraulic chamber 18B is configured to be filled with the fluid. The first hydraulic chamber 18A is connected to the second hydraulic chamber 18B via a connecting passage 34. The first hydraulic chamber 18A is in communication with the second hydraulic chamber 18B via the connecting passage 34.

[0057] The housing 32 includes a first chamber hole 36A and a second chamber hole 36B. The hydraulic device 14 includes a first piston 38A and a second piston 38B. The first piston 38A is movably provided in the first chamber hole 36A. The second piston 38B is movably provided in the second chamber hole 36B. The housing 32 and the first piston 38A define the first hydraulic chamber 18A in the first chamber hole 36A. The housing 32 and the second piston 38B define the second hydraulic chamber 18B in the second chamber hole 36B.

[0058] The hydraulic device 14 includes a first friction element 40A and a second friction element 40B. The first friction element 40A is movable relative to the housing 32 and can be brought into contact with the disc brake rotor 6. The second friction element 40B is movable relative to the housing 32 and can be brought into contact with the disc brake rotor 6. The first piston 38A is configured to move the first friction element 40A toward the disc brake rotor 6 in response to the hydraulic pressure supplied to the first hydraulic chamber 18A. The second piston 38B is configured to move the second friction element 40B toward the disc brake rotor 6 in response to the hydraulic pressure supplied to the second hydraulic chamber 18B. The structure of the hydraulic device 14 is not limited to the illustrated structure.

[0059] The hydraulic device 14 includes a hole 42. The hole 42 is configured to communicate with the hydraulic chamber 18. The hole 42 is configured to communicate with the first hydraulic chamber 18A and the second hydraulic chamber 18B. The hydraulic hose 16 is partially provided in the hole 42 in a state in which the hydraulic hose 16 is connected to the hydraulic device 14.

[0060] As in Fig. 4, the hydraulic device 14 includes a screw fitting 44, a bushing 46, and a needle 48. The housing 32 includes a mounting hole 32A. The screw fitting 44 is provided in the mounting hole 32A. The mounting hole 32A includes a threaded hole 32B. The screw fitting 44 includes an externally threaded portion 44A. The externally threaded portion 44A is configured to engage the threaded hole 32B. The bushing 46 is provided in the mounting hole 32A. The screw fitting 44 can be brought into contact with the bushing 46.

[0061] The screw connection 44 and the bushing 46 define the hole 42. The screw connection 44 includes a first hole 44H. The bushing 46 includes a second hole 46H. The hole 42 includes the first hole 44H and the second hole 46H. The mounting hole 32A includes a first mounting hole 32C and a second mounting hole 32D. The first mounting hole 32C has a larger inner diameter than the inner diameter of the second mounting hole 32D. The hole 42 includes the first hole 44H, the second hole 46H, and the second mounting hole 32D. The screw connection 44 and the bushing 46 are provided in the first mounting hole 32C.

[0062] The needle 48 is at least partially provided in the attachment hole 32A. The needle 48 is at least partially provided in the second attachment hole 32D. The attachment hole 32A is connected to the communication passage 34. The needle 48 is at least partially provided in the communication passage 34. The needle 48 includes a third hole 48H. The third hole 48H communicates with the attachment hole 32A and the communication passage 34. The third hole 48H is configured to connect the attachment hole 32A to the communication passage 34.

[0063] As in Fig. 5, the hydraulic hose 16 includes a fluid passage 16A. The fluid passage 16A is filled with the fluid before the hydraulic hose 16 is connected to the hydraulic device 14 and the hydraulic device 15.

[0064] The hydraulic hose 16 includes a hose body 50, an attachment member 52, and a film 54. The hose body 50 includes a first hole 50A. The hose body 50 includes a first hose end 50B and a second hose end 50C. The attachment member 52 is attached to the first hose end 50B of the hose body 50. The attachment member 52 is at least partially provided in the first hole 50A of the hose body 50. The attachment member 52 includes a second hole 52A. The second hole 52A communicates with the first hole 50A in a state where the attachment member 52 is attached to the hose body 50. The film 54 is attached to the attachment member 52. The film 54 is configured to seal one end of the second hole 52A in a state where the hydraulic hose 16 is not connected to the hydraulic device 14.

[0065] The hydraulic hose 16 includes an attachment member 56 and a film 58. The attachment member 56 is attached to the second hose end 50C of the hose body 50. The attachment member 56 is at least partially provided in the first hole 50A of the hose body 50. The attachment member 56 includes a third hole 56A. The third hole 56A communicates with the first hole 50A in a state in which the attachment member 56 is attached to the hose body 50. The film 58 is attached to the attachment member 56. The film 58 is configured to seal one end of the third hole 56A in a state in which the hydraulic hose 16 is not connected to the hydraulic device 14.

[0066] The fluid passage 16A includes the first hole 50A, the second hole 52A, and the third hole 56A. The fluid passage 16A is sealed by the films 54 and 58 in the state where the hydraulic hose 16 is not connected to the hydraulic device 14 and the hydraulic device 15. Thus, the hydraulic hose 16 can be marketed in a state where the fluid passage 16A is filled with the fluid.

[0067] As in Fig. 6, the hydraulic chamber 18, the connecting passage 34, and the hole 42 are filled with the fluid before the hydraulic device is connected to the hydraulic hose 16. The hydraulic device 10 includes a plug 60. The plug 60 is configured to be at least partially provided in the hole 42 in place of the hydraulic hose 16. To close the hole 42, the plug 60 is configured for attachment to the hydraulic device 14. To seal the hole 42, the plug 60 is configured for attachment to the hydraulic device 14.

[0068] The plug 60 comprises a first element 62 and a second element 64. The first element 62 is configured to be at least partially provided in the hole 42 of the hydraulic device 14 of the human-powered vehicle 2. The first element 62 includes a connection hole 66. The first element 62 includes an end surface 62A. The connection hole 66 extends from the end surface 62A. The second element 64 is configured to close the connection hole 66. To close the connection hole 66, the second element 64 is configured to be attached to the first element 62. To seal the connection hole 66, the second element 64 is configured to be attached to the first element 62.

[0069] As in Fig. 7, the first element 62 is configured to be partially provided within the hole 42. The first element 62 is configured to be at least partially provided within the first hole 44H of the screw connection 44. The first element 62 is configured to be partially provided within the first hole 44H of the screw connection 44. The first element 62 is configured to be completely provided outside the second hole 46H of the socket 46. However, the first element 62 can be configured to be at least partially provided within the second hole 46H of the socket 46 if needed or desired. The first element 62 can be configured to be completely provided within the first hole 44H if needed or desired. The first element 62 can be configured to be completely provided within the hole 42 if needed or desired.

[0070] As in the Fig. 7 and Fig. 8, the second member 64 is configured to change a state of the communication hole 66 from an open state in which the hydraulic chamber 18 communicates with the outside air via the communication hole 66 to a closed state in which the communication hole 66 is closed by the second member 64, in an attachment state in which the first member 62 is at least partially provided in the hole 42 of the hydraulic device 14. In the open state, the first member 62 is attached to the hydraulic device 14, and the hydraulic chamber 18 communicates with the outside air via the communication hole 66.

[0071] As in Fig. As shown in Figure 8, the communication hole 66 is configured to communicate the hydraulic chamber 18 of the hydraulic device 14 and the outside air in an attached state in which the first member 62 is at least partially provided in the hole 42 of the hydraulic device 14, and in an open state in which the second member 64 is completely provided outside the communication hole 66. In the open state, the first member 62 is attached to the hydraulic device 14, the second member 64 is completely provided outside the communication hole 66, and the hydraulic chamber 18 communicates with the outside air via the communication hole 66.

[0072] As in Fig. 7, the communication hole 66 includes a first end opening 66A and a second end opening 66B. The communication hole 66 extends from the first end opening 66A to the second end opening 66B. The second member 64 is configured to be attached to the second end opening 66B to close the second end opening 66B. The second end opening 66B is provided in the end surface 62A of the first member 62. The first end opening 66A is configured to be provided in the hole 42 in a state in which the first member 62 is at least partially provided in the hole 42. The second end opening 66B is configured to be provided outside the hole 42 in a state in which the first member 62 is at least partially provided in the hole 42.

[0073] The second member 64 includes an insert 70 and a stopper 72. The insert 70 extends from the stopper 72. The insert 70 is configured to be at least partially provided in the communication hole 66. The stopper 72 can be brought into contact with the end surface 62A in an inserted state in which the insert 70 is at least partially provided in the communication hole 66. The insert 70 may also be referred to as a second insert 70. The stopper 72 may also be referred to as a second stopper 72.

[0074] In the present embodiment, the insert 70 is configured to be fully provided in the communication hole 66 in a state where the stopper 72 is in contact with the end surface 62A. The stopper 72 can be brought into contact with the end surface 62A in the inserted state where the insert 70 is fully provided in the communication hole 66. However, the stopper 72 can be configured to be bring into contact with the end surface 62A in the inserted state where the insert 70 is partially provided in the communication hole 66, if necessary or desired. The insert 70 can be configured to be partially provided in the communication hole 66, if necessary or desired.

[0075] In the present embodiment, the stopper 72 is provided integrally with the insert 70 as a one-piece, unitary element. However, the stopper 72 may also be a separate element from the insert 70 if necessary or desired.

[0076] The second member 64 is configured for attachment to the first member 62 by press-fitting, adhesive bonding, or melting. The second member 64 is configured for attachment to the connection hole 66 by press-fitting, adhesive bonding, or melting. In the present embodiment, the second member 64 is configured for press-fitting to the first member 62. The second member 64 is configured for press-fitting to the connection hole 66. The insert 70 is configured for press-fitting into the connection hole 66.

[0077] The first member 62 includes a first end 62C and a second end 62D. The first end 62C includes the first end opening 66A. The second end 62D includes the second end opening 66B and the end surface 62A. The first end 62C is configured to be provided in the hole 42 in a state in which the first member 62 is at least partially provided in the hole 42. The second end 62D is configured to be provided outside the hole 42 in a state in which the first member 62 is at least partially provided in the hole 42.

[0078] The first member 62 includes a first insert 62E and a first stopper 62F. The first insert 62E extends from the first stopper 62F. The first insert 62E is configured to be at least partially provided within the hole 42. The first stopper 62F is configured to be completely provided outside the hole 42. The first stopper 62F can be brought into contact with one end of the screw connection 44 in a state in which the first insert 62E is at least partially provided within the hole 42. The first insert 62E includes the first end opening 66A and the first end 62C. The first stopper 62F includes the second end opening 66B, the end surface 62A, and the second end 62D. The first member 62 is free of an externally threaded portion. The first insert 62E is free of an externally threaded portion. The first stopper 62F is free of an externally threaded portion.

[0079] As in Fig. 7, the first end opening 66A has a first inner diameter DM1. The second end opening 66B has a second inner diameter DM2. In the present embodiment, the second inner diameter DM2 is different from the first inner diameter DM1. The second inner diameter DM2 is larger than the first inner diameter DM1. The communication hole 66 is tapered from the second end opening 66B to the first end opening 66A. An inner diameter of the communication hole 66 decreases from the second end opening 66B to the first end opening 66A. However, the shape of the communication hole 66 is not limited to the illustrated embodiment. The communication hole 66 may have shapes other than the conical shape if necessary or desired. The second inner diameter DM2 may be equal to or shorter than the first inner diameter DM1 if necessary or desired.

[0080] The connection hole 66 has a longitudinal central axis A1 and extends along the longitudinal central axis A1. The insert 70 has a first length L11. The first length L11 is defined radially relative to the longitudinal central axis A1. The stopper 72 has a second length L12. The second length L12 is defined radially with respect to the longitudinal central axis A1. In the present embodiment, the second length L12 is different from the first length L11. The second length L12 is longer than the first length L11. However, the second length L12 may be equal to or shorter than the first length L11 if necessary or desired.

[0081] At least one of the first length L11 and the second length L12 differs from at least one of the first inner diameter DM1 and the second inner diameter DM2. The first length L11 is longer than at least one of the first inner diameter DM1 and the second inner diameter DM2. The second length L12 is longer than at least one of the first inner diameter DM1 and the second inner diameter DM2.

[0082] In the present embodiment, the first length L11 is different from each of the first inner diameter DM1 and the second inner diameter DM2. The first length L11 is longer than the first inner diameter DM1. The first length L11 is shorter than the second inner diameter DM2. The second length L12 is different from each of the first inner diameter DM1 and the second inner diameter DM2. The second length L12 is longer than each of the first inner diameter DM1 and the second inner diameter DM2. However, the first length L11 may be equal to at least one of the first inner diameter DM1 and the second inner diameter DM2 if necessary or desired. The first length L11 may be shorter than the first inner diameter DM1 if necessary or desired.The first length L11 may be longer than the second inner diameter DM2, if necessary or desired, in a state where the second member 64 is provided entirely outside the connection hole 66. In such modifications, the second member 64 is elastically deformable and configured to be press-fitted into the connection hole 66. Furthermore, if necessary or desired, the second length L12 may correspond to at least one of the first inner diameter DM1 and the second inner diameter DM2. The second length L12 may be shorter than or equal to at least one of the first inner diameter DM1 and the second inner diameter DM2, if necessary or desired.

[0083] As in Fig. As can be seen in Figure 7, the first element 62 has a first outer length L21. The first outer length L21 is defined radially relative to the longitudinal center axis A1 in a closed state in which the connecting hole 66 is closed by the second element 64. The second element 64 has a second outer length L22. The second outer length L22 is defined radially relative to the longitudinal center axis A1 in the closed state.

[0084] At least one of the first outer length L21 and the second outer length L22 differs from at least one of the first inner diameter DM1 and the second inner diameter DM2. The first outer length L21 is longer than at least one of the first inner diameter DM1 and the second inner diameter DM2. The second outer length L22 is longer than at least one of the first inner diameter DM1 and the second inner diameter DM2.

[0085] In the present embodiment, the first outer length L21 is different from each of the first inner diameter DM1 and the second inner diameter DM2. The first outer length L21 is longer than the first inner diameter DM1 and the second inner diameter DM2. The second outer length L22 is different from the first inner diameter DM1 and the second inner diameter DM2. The second outer length L22 is longer than each of the first inner diameter DM1 and the second inner diameter DM2. The second outer length L22 is shorter than the first outer length L21. However, the second outer length L22 may be longer than or equal to the first outer length L21 if necessary or desired.

[0086] The hole 42 has an inner diameter DM3. The inner diameter DM3 is defined radially relative to the longitudinal center axis A1. At least one of the first outer length L21 and the second outer length L22 differs from the inner diameter DM3. In the present embodiment, each of the first outer length L21 and the second outer length L22 differs from the inner diameter DM3. The first outer length L21 is longer than the inner diameter DM3. The second outer length L22 is shorter than the inner diameter DM3. However, the second outer length L22 may be longer than or equal to the inner diameter DM3 if necessary or desired.

[0087] At least one of the first length L11 and the second length L12 is different from the inner diameter DM3. In the present embodiment, each of the first length L11 and the second length L12 is different from the inner diameter DM3. The first length L11 is shorter than the inner diameter DM3. The second length L12 is shorter than the inner diameter DM3. However, at least one of the first length L11 and the second length L12 may be equal to the inner diameter DM3 if necessary or desired. The first length L11 may be longer than the inner diameter DM3. The second length L12 may be longer than the inner diameter DM3 if necessary or desired.

[0088] At least one of the first inner diameter DM1 and the second inner diameter DM2 differs from the inner diameter DM3. In the present embodiment, each of the first inner diameter DM1 and the second inner diameter DM2 differs from the inner diameter DM3. The first inner diameter DM1 is shorter than the inner diameter DM3. The second inner diameter DM2 is shorter than the inner diameter DM3. However, the second inner diameter DM2 may be longer than or equal to the inner diameter DM3 if necessary or desired.

[0089] The connection hole 66 has a length L3. The length L3 is defined from the first end opening 66A to the second end opening 66B along the longitudinal center axis A1. The length L3 is different from at least one of the first inner diameter DM1, the second inner diameter DM2, and the inner diameter DM3. In the present embodiment, the length L3 is different from each of the first inner diameter DM1, the second inner diameter DM2, and the inner diameter DM3. The length L3 is longer than the first inner diameter DM1, the second inner diameter DM2, and the inner diameter DM3. However, the length L3 may be shorter than or equal to at least one of the first inner diameter DM1, the second inner diameter DM2, and the inner diameter DM3 if necessary or desired.

[0090] As in Fig. 7, the plug 60 further includes a sealing member 74. The sealing member 74, in the attached state, is configured to be at least partially provided between the first member 62 and an inner peripheral surface of the hole 42 of the hydraulic device 14. The first member 62 includes a groove 62B. The sealing member 74 is at least partially provided in the groove 62B. The groove 62B has an annular shape. The sealing member 74 has an annular shape. The sealing member 74 is completely provided in the groove 62B. The sealing member 74 includes an O-ring. However, the sealing member 74 may be partially provided in the groove 62B if necessary or desired. The sealing member 74 may also include elements other than the O-ring if necessary or desired. The sealing member 74 may include a lip seal.

[0091] The first member 62 is made of a first material. The second member 64 is made of a second material. The sealing member 74 is made of a third material. The second material is different from the first material. The second material is different from the third material. The first material is different from the third material. The first material is a non-metallic material. The second material is a metallic material. The third material is a non-metallic material. The first member 62 is made of a resin material such as synthetic resin. The second member 64 is made of aluminum, iron, or stainless steel. The sealing member 74 is made of an elastic member such as elastomer or rubber.

[0092] The assembly of the hydraulic device 14 and the plug 60 will be described below with reference to the Fig. 7 to 12 are described in detail.

[0093] In a Fig. In the comparative example illustrated in Fig. 9, a first member 162 is free from the communication hole 66. The first member 162 is inserted into the hole 42 of the hydraulic device 14 when the hydraulic chamber 18, the communication passage 34, and the hole 42 are filled with the fluid. However, in a case where the fluid is incompressible, the first member 162 may be difficult to insert into the hole 42 of the hydraulic device 14.

[0094] As in Fig. However, as shown in Fig. 10, the first member 62 can be easily inserted into the hole 42 of the hydraulic device 14 because the first member 62 includes the communication hole 66. The first member 62 is inserted into the hole 42 of the hydraulic device 14 in a state where the hydraulic chamber 18, the communication passage 34, and the hole 42 are filled with the fluid, and the second member 64 is detached from the first member 62. When the first member 62 is inserted into the hole 42 of the hydraulic device 14, the fluid flows into the communication hole 66. Thus, the communication hole 66 enables the first member 62 to be inserted into the hole 42 of the hydraulic device 14. The communication hole 66 of the first member 62 can restrict the overflow of the fluid from at least one of the hole 42 and the communication hole 66.

[0095] As in Fig. 8, the second element 64 is inserted into the connecting hole 66 after the first element 62 has been attached to the hole 42. As shown in Fig. As shown in Fig. 7, the insert 70 is inserted into the communication hole 66 in the state where the first member 62 is at least partially provided in the hole 42 until the stopper 72 comes into contact with the end surface 62A of the first member 62. The second member 64 is attached to the first member 62 without the fluid overflowing from the communication hole 66 or with a slight overflow of the fluid from the communication hole 66. In this way, the hole 42 of the hydraulic device 14 is closed by the plug 60. The hydraulic device 10 including the hydraulic device 14 and the plug 60 can be marketed in a state where the hydraulic chamber 18 is filled with the fluid.

[0096] As in Fig. 8, in a state where the first element 62 is attached to the hole 42 of the hydraulic device 14, the second element 64 is detached from the first element 62 before the hydraulic hose 16 is connected to the hydraulic device 14. As shown in Fig. As can be seen in Figure 10, the first element 62 is detached from the hole 42 of the hydraulic device 14. The connecting hole 66 allows the first element 62 to be easily detached from the hole 42.

[0097] As in Fig. 11, the hydraulic hose 16 is inserted into the hole 42 when the hydraulic hose 16 is connected to the hydraulic device 14. As shown in Fig. 12, the needle 48 pierces the film 54 when the end of the hydraulic hose 16 reaches the needle 48. Thus, the hydraulic chamber 18 of the hydraulic device 14 is in fluid communication with the fluid passage 16A of the hydraulic hose 16 via the third hole 48H of the needle 48.

[0098] As in Fig. As can be seen in Figure 13, the hydraulic device 12 includes a plug 80. The hydraulic device 15 includes a hole 81. The plug 80 is configured to be at least partially provided in the hole 81 in place of the hydraulic hose 16. To seal the hole 81, the plug 80 is configured to be attached to the hydraulic device 15.

[0099] The plug 80 comprises a first element 82 and a second element 84. The first element 82 is adapted to be at least partially mounted in the hole 81 of the hydraulic device 15 of the human-powered vehicle 2.

[0100] The plug 80 has substantially the same structure as the plug 60. The description and illustration regarding the plug 80 can be used like the description and illustration of the plug 60. Therefore, the plug 80 will not be described in detail here for the sake of brevity.

[0101] The shape of the second element 64 is not limited to the illustrated shape. As in Fig. 14, the insert 70 may, for example, have an externally threaded portion 70C. The connecting hole 66 may include an internally threaded portion 66C. The externally threaded portion 70C is configured to engage with the internally threaded portion 66C in a closed state in which the connecting hole 66 is closed by the second member 64. In this modification, the stopper 72 includes a tool engagement portion 72C. The tool engagement portion 72C is configured to engage with a tool such as a screwdriver and a hexagon wrench. Fig. The structure illustrated in Figure 14 may be applied to the plug 80 or its modifications if necessary or desired.

[0102] As in Fig. 15, the insert 70 may be omitted from the second member 64 if necessary or desired. In such modifications, the second member 64 is adapted for attachment to the first member 62 by at least one of adhesive bonding and melting. The adhesive used for the adhesive bonding may be any adhesive, e.g., a room temperature curing adhesive, a thermally curing adhesive, or a light curing adhesive. The second member 64 may include an adhesive tape in a case where the second member 64 is bonded to the first member 62 by adhesive bonding. In a case where the second member 64 is attached to the first member 62 by melting, the second member 64 is melted by heat to be attached to the first member 62. The Fig. The structure shown in Figure 15 may be applied to the plug 80 or its modifications if necessary or desired.

[0103] As in Fig. 16, the stopper 72 may be omitted from the second member 64 if necessary or desired. In such modifications, the second member 64 is adapted for joining to the first member 62 by at least one of press-fitting, adhesive bonding, and melting. The adhesive used for the adhesive bonding may be any adhesive, such as a room temperature curing adhesive, a thermally curing adhesive, and a light-curing adhesive. Fig. The structure illustrated in Figure 16 may be applied to the plug 80 or its modifications if necessary or desired.

[0104] As in Fig. 17, the second member 64 may contain adhesive. The second member 64 may be at least partially inserted into the connection hole 66 to close the connection hole 66. The adhesive used for the adhesive bonding may be any adhesive, such as a room temperature curing adhesive, a thermally curing adhesive, and a light-curing adhesive. Fig. The structure shown in Figure 17 may be applied to the plug 80 or its modifications if necessary or desired.

[0105] In the present embodiment and its modifications, the communication hole 66 is tapered from the second end opening 66B to the first end opening 66A. However, the shape of the communication hole 66 is not limited to the conical shape. In an embodiment shown in Fig. 18, the connection hole 66 is, for example, tapered from the second end opening 66B to the first end opening 66A. Alternatively, the connection hole 66 may also have a stepped shape. The connection hole 66 includes a first connection hole 66G and a second connection hole 66H. The first connection hole 66G has the first inner diameter DM1. The second connection hole 66H has the second inner diameter DM2. The first connection hole 66G includes the first end opening 66A. The second connection hole 66H includes the second end opening 66B. The first connection hole 66G extends from the second connection hole 66H to the first end opening 66A. The second connection hole 66H extends from the first connection hole 66B to the second end opening 66B. The first connection hole 66G may be tapered if necessary or desired. The second connecting hole 66H can be tapered if required or desired. Fig. The structure of the connecting hole 66 shown in Fig. 18 can be applied to the Fig. The modifications shown in Figures 14 to 17 may be applied.

[0106] As in Fig. 19, the groove 62B of the first element 62 may have other shapes than those shown in Fig. 7. In the Fig. 19, the first member 62 includes a first outer peripheral surface 62X, a second outer peripheral surface 62Y, and an intermediate surface 62Z. The first outer peripheral surface 62X, the second outer peripheral surface 62Y, and the intermediate surface 62Z form the groove 62B. The first outer peripheral surface 62X defines a first groove diameter DM41. The second outer peripheral surface 62Y defines a second groove diameter DM42. The second groove diameter DM42 is shorter than the first groove diameter DM41. The first outer peripheral surface 62X is closer to the first end opening 66A of the communication hole 66 than the second outer peripheral surface 62Y. The intermediate surface 62Z is provided between the first outer peripheral surface 62X and the second outer peripheral surface 62Y.

[0107] As in Fig. As can be seen in Fig. 20, the sealing member 74 is in contact with the second outer peripheral surface 62Y of the groove 62B when the first member 62 is inserted into the hole 42 in an insertion direction D11. The sealing member 74 is slightly compressed between the inner peripheral surface of the hole 42 and the second outer peripheral surface 62Y of the groove 62B, so that the first member 62 can be easily inserted into the hole 42 even when the fluid is incompressible.

[0108] As in Fig. As can be seen in Fig. 21, the sealing member 74 is moved from the second outer peripheral surface 66Y to the first outer peripheral surface 66X when the first member 62 is pulled in a detachment direction D12 opposite to the insertion direction D11. The sealing member 74 is compressed more strongly between the inner peripheral surface of the hole 42 and the first outer peripheral surface 62X of the groove 62B than in the state in which the sealing member 74 is compressed between the inner peripheral surface of the hole 42 and the second outer peripheral surface 62Y of the groove 62B. In this way, the sealing member 74 reliably seals a gap between the first member 62 and the inner peripheral surface of the hole 42. The Fig. The structure shown in Figures 19 to 21 may be applied to the plug 80 or its modifications if necessary or desired.

[0109] In the above-mentioned embodiment and its modifications, the hydraulic device 14 includes the needle 48. However, the needle 48 may be omitted from the hydraulic device 14 if necessary or desired. In such modifications, the film 54 is omitted from the hydraulic hose 16. The same modification can be applied to the hydraulic device 15 and its modifications.

[0110] In the present application, the term "comprising" and its derivatives, as used herein, are to be understood as open-ended terms that specify the presence of the stated features, elements, components, groups, integers, and / or steps, but do not preclude the presence of other unspecified features, elements, components, groups, integers, and / or steps. This concept also applies to words of similar meaning, such as the terms "have," "include," and their derivatives.

[0111] The terms “limb”, “section”, “portion”, “part”, “element”, “body” and “structure”, when used in the singular, can have the dual meaning of a single part or a plurality of parts.

[0112] The ordinal numbers mentioned in this application, such as "first" and "second," are merely identifiers and have no other meaning, such as a specific order or the like. Furthermore, for example, the term "first element" itself does not imply the presence of a "second element," and the term "second element" itself does not imply the presence of a "first element."

[0113] The term "pair" as used herein may include the configuration in which the pair of elements have different shapes or structures from each other, in addition to the configuration in which the pair of elements have the same shapes or structures as each other.

[0114] The terms “a” (or “an”), “one or more” and “at least one” may be used interchangeably here.

[0115] The phrase "at least one of" as used in this disclosure means "one or more" of a desired selection. For example, the phrase "at least one of" as used in this disclosure means "only a single selection" or "both of two selections" when the number of selections is two. For example, the phrase "at least one of" as used in this disclosure means "only a single selection" or "any combination of equal to or more than two selections" when the number of selections is equal to or greater than three. The phrase "at least one of A, B, and C" includes (1) A alone, (2) B alone, and (3) both A and B. The phrase "at least one of A, B, and C" includes (1) A alone, (2) B alone, (3) C alone, (4) both A and B, (5) both B and C, (6) both A and C, and (7) all of A, B, and C.In other words, the phrase “at least one of A and B” in this disclosure does not mean “at least one of A and at least one of B”.

[0116] Finally, terms such as "substantially," "approximately," and "approximately," as used herein, mean a reasonable departure from the modified term so that the final result is not materially altered. All numerical values described in this application may be construed to include the terms "substantially," "approximately," and "approximately."

[0117] Of course, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. LIST OF REFERENCE SYMBOLS 2 muscle-powered vehicle 4 vehicle body 4A frame 4B handlebar 6 disc brake rotor 10 hydraulic device 12 hydraulic device 14 Hydraulic device 15 Hydraulic device 16 Hydraulic hose 16A fluid passage 18 Hydraulic chamber 18A first hydraulic chamber 18B second hydraulic chamber 20 hydraulic chamber 22 housings 24 pistons 25 Preload element 26 hydraulic reservoirs 28 Actuating element 29 Assembly section 30 chamber hole 32 housings 32A mounting hole 32B threaded hole 32C first mounting hole 32D second mounting hole 34 connecting passage 36A first chamber hole 36B second chamber hole 38A first piston 38B second piston 40A first friction element 40B second friction element 42 holes 44 screw connection 44A external thread section 44H first hole 46 socket 46H second hole 48 needle 48H third hole 50 hose bodies 50A first hole 50B first hose end 50C second hose end 52 Mounting element 52A second hole 54 slides 56 Mounting element 56A third hole 58 Slide 60 plugs 62 first element 62A end face 62B groove 62C first end 62D second end 62E first deployment 62F first plug 62X first outer peripheral surface 62Y second outer peripheral surface 62Z intermediate surface 64 second element 66 connecting hole 66A first end opening 66B second end opening 66C internal thread section 66X first outer peripheral surface 66Y second outer peripheral surface 70 deployment 70C external thread section 72 plugs 72C Tool engagement section 74 Sealing element 80 plugs 81 holes 82 first element 84 second element 162 first element A1 Longitudinal center axis D11 Insertion direction D12 Detachment direction DM1 first inner diameter DM2 second inner diameter DM3 inner diameter DM41 first groove diameter DM42 Second groove diameter L11 first length L12 second length L21 first outside length L22 second outer length L3 length

Claims

[1] Plug, comprising: a first element adapted to be at least partially provided in a hole of a hydraulic device of a muscle-powered vehicle, wherein the first element includes a connection hole; and a second member configured to change a state of the connecting hole in an attachment state in which the first member is at least partially provided in the hole of the hydraulic device; from an open state in which the hydraulic chamber is in communication with the outside air via the connecting hole, to a closed state in which the connection hole is closed by the second element. [2] A plug according to claim 1, wherein the communication hole includes a first end opening and a second end opening and extends from the first end opening to the second end opening. [3] Plug according to claim 2, in which the first end opening has a first inner diameter, the second end opening has a second inner diameter, the first element has a first outer length which, in a closed state in which the connecting hole is closed by the second element, is defined radially relative to the longitudinal central axis, the second element has a second outer length which, in the closed state, is defined radially to the longitudinal central axis, and at least one of the first outer length and the second outer length differs from at least one of the first inner diameter and the second inner diameter. [4] A plug according to claim 3, wherein the first outer length is longer than at least one of the first inner diameter and the second inner diameter. [5] A plug according to claim 3 or 4, wherein the second outer length is longer than at least one of the first inner diameter and the second inner diameter. [6] A plug according to any one of claims 3 to 5, wherein the second outer length is shorter than the first outer length. [7] Plug according to claim 2, in which the first end opening has a first inner diameter, and the second end opening has a second inner diameter that is different from the first inner diameter. [8] A plug according to any one of claims 3 to 6, wherein the second inner diameter differs from the first inner diameter. [9] Plugs comprising: a first element adapted to be at least partially provided in a hole of a hydraulic device of a muscle-powered vehicle, wherein the first member has a communication hole, the communication hole having a first end opening and a second end opening and extending from the first end opening to the second end opening, the first end opening having a first inner diameter and the second end opening having a second inner diameter different from the first inner diameter. [10] A plug according to any one of claims 7 to 9, wherein the second inner diameter is larger than the first inner diameter. [11] A plug according to any one of claims 7 to 10, wherein the communication hole tapers from the second end opening to the first end opening. [12] A plug according to any one of claims 2 to 11, wherein the first element includes an end surface, the connection hole extends from the end face, the second element contains an insert and a stopper, the insert is adapted to be at least partially provided in the connecting hole, and the stopper can be brought into contact with the end surface in an inserted state in which the insert is at least partially provided in the connecting hole. [13] Plugs comprising: a first member adapted to be provided at least partially in a hole of a hydraulic device of a human-powered vehicle, the first member including an end surface and a connecting hole extending from the end surface; and a second member configured to close the communication hole, the second member including an insert and a stopper, the insert configured to be at least partially provided in the communication hole, the stopper being capable of being brought into contact with the end surface in an inserted state in which the insert is at least partially provided in the communication hole, the communication hole being configured to connect a hydraulic chamber of the hydraulic device and outside air in an attached state in which the first member is at least partially provided in the hole of the hydraulic device and an open state in which the second member is completely provided outside the communication hole. [14] A plug according to claim 12 or 13, wherein the stopper is provided integrally with the insert as a one-piece unitary element. [15] Plug according to one of claims 12 to 14, in which the connecting hole has a longitudinal central axis and extends along the longitudinal central axis, the insert has a first length which is defined radially to the longitudinal central axis, the stopper has a second length defined radially to the longitudinal center axis, and the second length is longer than the first length. [16] Plug according to one of claims 12 to 15, in which the insert has an external thread section, the connecting hole has an internal thread section and the external thread portion is configured to engage with the internal thread portion in a closed state in which the connecting hole is closed by the second member. [17] A plug according to any one of claims 1 to 16, wherein the second element is adapted to be attached to the first element by pressing, adhesive bonding or melting. [18] A plug according to any one of claims 1 to 17, further comprising a sealing member adapted, in the mounted state, to be at least partially provided between the first member and an inner peripheral surface of the hole of the hydraulic device. [19] Plug according to claim 18, in which the first element contains a groove, and the sealing element is at least partially provided in the groove. [20] Plug according to one of claims 1 to 19, in which the first element is made of a first material, the second element is made of a second material, and the second material differs from the first material. [21] Plug according to claim 20, in which the first material contains a non-metallic material, and the second material contains a metallic material. [22] Hydraulic device comprising: the plug according to any one of claims 1 to 21; and the hydraulic device comprising: the hydraulic chamber, which is designed to be filled with a fluid; and the hole designed to connect to the hydraulic chamber.

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