TW201941992A - Plug and hydraulic device including a main body, a flow path and a cover - Google Patents

Abstract

The present invention provides a plug and a hydraulic device that can suppress splashing of oil. The plug of the present invention is used for a hydraulic device of a small vehicle including a bicycle and provided with: a main body arranged at an opening section of a hydraulic chamber disposed in the hydraulic device; a flow path disposed in the main body in a manner of fluid communication with the hydraulic chamber; and a cover covering the end of the flow path on the side opposite to the hydraulic chamber.

Description

Plug and hydraulic device

The invention relates to a plug and a hydraulic device.

Small vehicles, including bicycles, sometimes use hydraulics.

[Problems to be solved by the invention]

However, before the hose is installed in the hydraulic device, a plug for preventing oil leakage is installed in the hydraulic device. However, there are cases in which oil splashes when the plug is pulled out, which reduces the workability of installation.

The present invention is to solve the above problems, and an object thereof is to provide a plug and a hydraulic device that can suppress oil splashing.
[Technical means to solve the problem]

In order to solve the above-mentioned problems and achieve the objective, the plug of the first aspect of the present invention is a hydraulic device for a small vehicle including a bicycle, and includes a main body, which is arranged in a hydraulic chamber provided in the hydraulic device of the hydraulic device. An opening portion; a flow path provided on the main body so as to fluidly communicate with the hydraulic pressure chamber; and a cover covering an end portion of the flow path opposite to the hydraulic pressure chamber. According to the plug of the first aspect described above, as the cover is opened, one end of the flow path is opened. Therefore, when the plug is pulled out of the hydraulic device, it is difficult to generate a pressure difference between the inside and the outside of the hydraulic device. Therefore, the splash of oil can be suppressed.

In the plug according to the first aspect and the second aspect, the cover is integrally provided on the body. According to the plug of the second aspect described above, the plug can be easily manufactured. In addition, the cover can be prevented from falling off from the body.

In the plug of the third aspect as described in the first or second aspect, the cover is provided to be detachable from the body at least partially. According to the plug of the third aspect described above, it is possible to easily perform the operation of applying force to the cover to open the end of the flow path.

In the plug of the fourth aspect as in any one of the first to third aspects, the cover is pressed by the cover being pushed in a direction different from a direction away from the hydraulic chamber. The flow path is configured such that an end portion on the side opposite to the hydraulic pressure chamber is opened. According to the plug of the fourth aspect, the splash of oil when the cover is detached from the body can be suppressed.

In the plug according to the fifth aspect of any one of the first to fourth aspects, the cover is formed in a rod shape protruding from an end surface of the body opposite to the hydraulic chamber. According to the plug of the fifth aspect, the cover can be easily deformed.

In the plug of the sixth aspect according to any one of the first to fourth aspects, the cover includes a synthetic resin. According to the plug of the sixth aspect, the plug can be easily manufactured.

In the plug of the seventh aspect according to any one of the first to sixth aspects, the main body contains a synthetic resin. According to the plug of the seventh aspect, the plug can be easily manufactured.

The plug of the eighth aspect as in any of the first to seventh aspects, further includes a sealing member provided on the main body so as to face the hydraulic device. According to the plug of the eighth aspect, oil leakage between the plug and the hydraulic device can be suppressed.

In order to solve the above problems and achieve the object, a hydraulic device according to a ninth aspect of the present invention includes the plug according to any one of the first to eighth aspects, and a casing having the hydraulic chamber and for installing the plug body. According to the hydraulic device of the ninth aspect, one end of the flow path is opened as the cover is opened. Therefore, when the plug is pulled out of the hydraulic device, it is difficult to generate a pressure difference between the inside and the outside of the hydraulic device. Therefore, the splash of oil can be suppressed.

The hydraulic device according to the tenth aspect as described in the ninth aspect further includes a control lever and a piston that operates according to the operation of the control lever. According to the hydraulic device of the tenth aspect, a brake operating device capable of suppressing the splash of oil can be realized.

The hydraulic device according to the eleventh aspect of the ninth aspect further includes a brake pad and a piston that presses the brake pad against a rotating body. According to the hydraulic device of the eleventh aspect, a brake device capable of suppressing the splash of oil can be realized.
[Effect of the invention]

According to the present invention, splashing of oil can be suppressed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the present invention is not limited to this embodiment, and when there are a plurality of embodiments, a combination of the embodiments is also included. For example, in this embodiment, although the case where a human-powered vehicle is a bicycle is described, it can also be used for other vehicles driven by human power.

(Implementation form)
FIG. 1 is a schematic diagram of a brake system according to an embodiment. Fig. 2 is a sectional view of a brake system according to an embodiment. Fig. 3 is a sectional view of the periphery of a needle according to the embodiment. Fig. 4 is a sectional view of a hose according to the embodiment. Fig. 5 is a sectional view of a first hydraulic device according to the embodiment. Fig. 6 is a sectional view of a second hydraulic device according to the embodiment. Fig. 7 is a sectional view of the periphery of the plug according to the embodiment. FIG. 8 is a cross-sectional view of the plug according to the embodiment when the cover is detached.

The brake system 1 according to the embodiment is used for a small vehicle. A small vehicle using the brake system 1 of this embodiment is, for example, a bicycle. Small vehicles are not limited to bicycles. Small vehicles include electric bicycles, or other two-wheeled electric vehicles. Small vehicles include vehicles that do not require a driver ’s license to drive on public roads. Small vehicles do not include vehicles with internal combustion engines. As shown in FIG. 1, the brake system 1 includes a first hydraulic device 2, a second hydraulic device 4, and a hose 6.

FIG. 4 shows the hose 6 before being connected to the first hydraulic device 2 and the second hydraulic device 4. FIG. 5 shows the first hydraulic device 2 before being connected to the hose 6. FIG. 6 shows the second hydraulic device 4 before being connected to the hose 6.

As shown in FIG. 1, the first hydraulic device 2 is a brake operating device. As shown in FIGS. 1 and 2, the first hydraulic device 2 includes a housing 21, a cylinder 22, a reservoir 23, a piston 24, a needle 25, a threaded sleeve joint 26, a bushing 27, a lever 28, and Fixture 29.

As shown in FIG. 1, the housing 21 is attached to a handle 11 of a small vehicle by a clamp 29. The control lever 28 is provided so as to be able to swing relative to the housing 21. As shown in FIG. 5, the control lever 28 includes a connection portion 281, a rotation shaft 282, a connection member 283, and a lever 284. The connecting portion 281 is connected to the lever 284 via a connecting member 283 and rotates around the rotation shaft 282. When not in use, a stopper 211 is mounted on the clamp 29 to limit the swing of the control lever 28.

As shown in FIG. 1, the cylinder 22 is provided in the housing 21. The cylinder 22 is substantially cylindrical. As shown in FIG. 2, the cylinder 22 includes a hydraulic chamber 201. The hydraulic pressure chamber 201 includes a piston chamber 202, a hose installation chamber 203 for installing the hose 6, and a thread groove 221 provided in the hose installation chamber 203. The piston chamber 202 is disposed on the lever 28 side with respect to the hose installation chamber 203. In a state where the hose 6 is attached to the first hydraulic device 2, the hydraulic chamber 201 is filled with oil. The screw groove 221 is provided on the inner peripheral surface of the hose installation chamber 203. The reservoir 23 stores oil and communicates with the piston chamber 202 according to the position of the piston 24.

As shown in FIG. 5, the piston 24 is disposed in the piston chamber 202. The piston 24 is connected to a rod 284. With the rocking of the control lever 28, a force is applied from the lever 284 to the piston 24, and the piston 24 slides in the axial direction of the cylinder 22. As described above, the first hydraulic device 2 includes the control lever 28 and the piston 24 that is operated in accordance with the operation of the control lever 28. As a result, the pressure of the oil in the piston chamber 202 and even the hydraulic chamber 201 changes.

As shown in FIG. 2, the needle 25 is attached to the cylinder 22. The needle 25 is provided between the piston chamber 202 and the hose installation chamber 203. The needle 25 includes a communication hole that communicates the piston chamber 202 and the hose installation chamber 203. In the hydraulic chamber 201, oil can be moved between the piston chamber 202 and the hose installation chamber 203 via a needle 25. As shown in FIG. 3, the needle 25 includes a body portion 251 and a tip portion 256. The main body portion 251 is cylindrical and fits into the cylinder 22. The front end portion 256 is cylindrical, and protrudes from the main body portion 251 toward the hose installation chamber 203 side.

As shown in FIG. 2, the threaded sleeve joint 26 is mounted on the cylinder 22. The threaded sleeve joint 26 is inserted into the hose installation chamber 203 of the hydraulic chamber 201. One end of the threaded sleeve joint 26 is disposed inside the hydraulic chamber 201. The other end of the threaded sleeve joint 26 is disposed outside the cylinder 22. The threaded sleeve joint 26 is cylindrical. The threaded sleeve joint 26 includes a threaded groove 261 on the outer peripheral surface. The screw groove 261 is engaged with the screw groove 221 of the hose installation chamber 203. Furthermore, the threaded sleeve joint 26 may be multi-threaded. Thereby, the axial movement amount of the threaded sleeve joint 26 when the unit angle is rotated is increased.

As shown in FIG. 2, the bushing 27 is disposed in the hose installation chamber 203 in the hydraulic chamber 201. The bushing 27 is cylindrical. The bushing 27 is formed of, for example, copper or a copper alloy, but is not limited thereto. One end of the bushing 27 is in contact with the inner peripheral surface of the hose installation chamber 203. The other end of the bushing 27 is in contact with the end surface of the threaded sleeve joint 26. If the threaded sleeve joint 26 is rotated to enter the hose installation chamber 203 of the hydraulic chamber 201, the bushing 27 is pushed and deformed.

As shown in FIG. 1, the second hydraulic device 4 is a braking device. As shown in FIGS. 1 and 2, the second hydraulic device 4 includes a housing 41, a needle 45, a threaded sleeve joint 46, a bushing 47, a piston 48, and a brake pad 49.

As shown in FIG. 1, the casing 41 is mounted on the rear fork 15 of a frame of a small vehicle. The housing 41 may also be mounted on a front fork of a frame of a small vehicle. As shown in FIG. 6, the piston 48 and the brake pad 49 are arranged on the case 41. The piston 48 can slide relative to the housing 41. The brake pad 49 is movably supported by the case 41 via a pad pin (not shown).

As shown in FIGS. 2 and 6, the housing 41 includes a hydraulic chamber 401. The hydraulic pressure chamber 401 includes a piston chamber 402, a hose installation chamber 403 for installing the hose 6, a flow path 404 provided between the piston chamber 402 and the hose installation chamber 403, and a thread groove 421 provided in the hose installation chamber 403. . The piston chamber 402 is disposed on the piston 48 side with respect to the hose installation chamber 403. The piston 48 is movably disposed in the piston chamber 402. FIG. 6 shows a state where the piston 48 is arranged in the standby position and the piston chamber 402 is closed. In a state where the hose 6 is attached to the second hydraulic device 4, the hydraulic chamber 401 is filled with oil. The screw groove 421 is provided in the inner peripheral surface of the hose installation chamber 403.

The oil from the first hydraulic device 2 passes through the hydraulic chamber 401 and presses the piston 48. As a result, the two pistons 48 and the two brake pads 49 move relative to the housing 41, and the two brake pads 49 sandwich the rotating body 13. The rotating body 13 is, for example, a disc brake rotor provided on a rim of a small vehicle. As described above, the second hydraulic device 4 includes the brake pads 49 and the piston 48 that presses the brake pads 49 against the rotating body 13. By the friction generated between the brake pad 49 and the rotating body 13, the wheel rim is braked. In other words, the second hydraulic device 4 is a disc brake device that brakes a disc brake rotor as the rotating body 13. The rotating body 13 is not limited to a rotor, and may be a rim of a rim. That is, the second hydraulic device 4 may be a rim brake device that brakes the rim of the rim as the rotating body 13.

As shown in FIG. 2, the needle 45 is attached to the case 41. The needle 45 is provided between the piston chamber 402 and the hose installation chamber 403. The needle 45 includes a communication hole that connects the piston chamber 402 and the hose installation chamber 403. In the hydraulic chamber 401, oil can be moved between the piston chamber 402 and the hose installation chamber 403 via the needle 45. The needle 45 has the same structure as the above-mentioned needle 25.

As shown in FIG. 2, the threaded sleeve joint 46 is mounted on the housing 41. The threaded sleeve joint 46 is inserted into the hydraulic chamber 401. One end of the threaded sleeve joint 46 is disposed inside the hydraulic chamber 401. The other end of the threaded sleeve joint 46 is disposed outside the casing 41. The threaded sleeve joint 46 is cylindrical. The threaded sleeve joint 46 includes a threaded groove 461 on the outer peripheral surface. The screw groove 461 is engaged with the screw groove 421 of the hose installation chamber 403. Furthermore, the threaded sleeve joint 46 may be multi-threaded. Accordingly, the axial movement amount of the threaded sleeve joint 46 when the unit angle is rotated is increased.

As shown in FIG. 2, the bushing 47 is disposed in the hose installation chamber 403 in the hydraulic chamber 401. The bushing 47 is cylindrical. The bushing 47 is formed of, for example, copper or a copper alloy, but is not limited thereto. One end of the bushing 47 is in contact with the inner peripheral surface of the hose installation chamber 403. The other end of the bushing 47 is in contact with the end surface of the threaded sleeve joint 46. When the threaded sleeve joint 46 is rotated to enter the hydraulic chamber 401, the bushing 47 is pushed and deformed.

As shown in FIG. 2, the hose 6 is a member that connects the first hydraulic device 2 and the second hydraulic device 4. The hose 6 transmits a change in the hydraulic pressure generated by the first hydraulic device 2 to the second hydraulic device 4. As shown in FIGS. 2 and 4, the hose 6 includes a hose body 61, a mounting member 65, and a membrane 66.

The hose body 61 is a flexible cylindrical member. The hose body 61 is formed of, for example, a synthetic resin, but is not limited thereto. The hose body 61 is provided with a flow path 611 as shown in FIG. 2. The flow path 611 is filled with oil. One end of the hose body 61 is inserted into the hydraulic chamber 201 of the first hydraulic device 2. The other end of the hose body 61 is inserted into the hydraulic chamber 401 of the second hydraulic device 4.

The attachment member 65 is attached to the end of the hose body 61. The mounting member 65 is inserted into the hose body 61 from an opening at an end portion of the hose body 61. The rigidity of the mounting member 65 is higher than that of the hose body 61. Specifically, the Young's modulus of the mounting member 65 is larger than the Young's modulus of the hose body 61. The mounting member 65 contains a metal. Examples of the metal include copper and a copper alloy. Alternatively, the mounting member 65 contains a synthetic resin. The mounting member 65 includes a main body portion 651 and a flange portion 652. The body portion 651 is substantially cylindrical and is in contact with the inner peripheral surface of the hose body 61. The flange portion 652 is located at an end portion of the body portion 651 and is in contact with an end surface of the hose body 61.

As shown in FIG. 4, the film 66 covers the opening of the mounting member 65. The film 66 is attached to the flange portion 652. The film 66 is in close contact with the flange portion 652, thereby suppressing oil leakage from the opening of the mounting member 65.

As shown in FIGS. 5 and 6, the first hydraulic device 2 and the second hydraulic device 4 include a plug 7. The first hydraulic device 2 (second hydraulic device 4) includes a housing 21 (housing 41) having a hydraulic chamber 201 (hydraulic chamber 401) and a plug 7 to which the plug 7 is mounted. The plug 7 suppresses oil leakage inside the first hydraulic device 2 and the second hydraulic device 4.

The plug 7 is used for a hydraulic device (a first hydraulic device 2 or a second hydraulic device 4) of a small vehicle including a bicycle. As shown in FIG. 7, the plug 7 includes a main body 71, a flow path 73, and a cover 75. The main body 71 is disposed in an opening portion of a hydraulic pressure chamber 201 (a hydraulic pressure chamber 401 provided in the second hydraulic pressure device 4) provided in the first hydraulic device 2. The flow path 73 is provided in the main body 71 so as to fluidly communicate with the hydraulic pressure chamber 201 (hydraulic pressure chamber 401). The cover 75 covers the end of the flow path 73 on the side opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401).

The cover 75 is integrally provided on the body 71. For example, the body 71 and the cover 75 are integrally molded using a synthetic resin. The cover 75 contains a synthetic resin. The body 71 contains a synthetic resin. The cover 75 is formed in a rod shape protruding from an end surface of the main body 71 on the side opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401). For example, the cover 75 is cylindrical. The cross-sectional area of the cover 75 in a cross section orthogonal to the axial direction of the body 71 is larger than the cross-sectional area of the flow path 73 in the cross section. When viewed from the axial direction of the main body 71, the cover 75 and the entire surface of the flow path 73 overlap. The shape of the cover 75 is not limited to a cylindrical shape.

The cover 75 is provided to be detachable from the body 71 at least in part. The cover 75 is pushed by the cover 75 in a direction different from the direction away from the hydraulic pressure chamber 201 (hydraulic pressure chamber 401) to open the end of the flow path 73 on the side opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401). Way of composition. When the cover 75 is pushed in the radial direction (a direction orthogonal to the axial direction) of the body 71, the cover 75 is plastically deformed. As shown in FIG. 8, an end portion on the main body 71 side of the cover 75 is detached from the main body 71. Thereby, the end of the flow path 73 on the side opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401) is opened.

As shown in FIG. 7, the plug 7 includes a sealing member 77 provided on the main body 71 so as to face the first hydraulic device 2 (second hydraulic device 4). The sealing member 77 is annular, and is formed of, for example, a synthetic rubber. The sealing member 77 is fitted in a ring-shaped recessed portion 711 provided on the outer peripheral surface of the main body 71.

When the hose 6 is connected to the first hydraulic device 2, first, the cap 75 of the plug 7 of the first hydraulic device 2 is detached. Thereby, the flow path 73 of the plug 7 is opened. Thereafter, the plug 7 is pulled out from the first hydraulic device 2. Since the flow path 73 is opened, the splash of oil when the plug 7 is pulled out is suppressed. Thereafter, one end of the hose 6 is inserted into the hydraulic chamber 201 of the first hydraulic device 2. The membrane 66 is broken by the needle 25, so that the piston chamber 202 of the first hydraulic device 2 and the flow path 611 of the hose 6 are communicated. Thereafter, the threaded sleeve joint 26 is rotated to deform the bushing 27 and bite into the hose body 61. Thereby, the hose 6 is fixed to the first hydraulic device 2.

When the hose 6 is connected to the second hydraulic device 4, first, the cap 75 of the plug 7 of the second hydraulic device 4 is detached. Thereby, the flow path 73 of the plug 7 is opened. Thereafter, the plug 7 is removed from the second hydraulic device 4. Since the flow path 73 is opened, the splash of oil when the plug 7 is pulled out is suppressed. Thereafter, the other end of the hose 6 is inserted into the hydraulic chamber 401 of the second hydraulic device 4. The membrane 66 is broken by the needle 45, so that the piston chamber 402 of the second hydraulic device 4 and the flow path 611 of the hose 6 are communicated. Thereafter, the threaded sleeve joint 46 is rotated to deform the bushing 47 and bite into the hose body 61. Thereby, the hose 6 is fixed to the second hydraulic device 4.

FIG. 9 is a schematic diagram of a braking system according to an embodiment during transportation. FIG. 10 is a perspective view of the hose in the embodiment before being connected to the hydraulic device. As shown in FIG. 9, when the hose 6 is transported, the hose 6 is put into the tank 100 with the second hydraulic device 4 connected, for example. The box 100 includes a supporting member 101. As shown in FIG. 9, the hose 6 is hung from the support member 101 so that the hose body 61 is not wound around the entire circumference of the support member 101. This makes it difficult for the hose 6 to have a so-called winding tendency.

As shown in FIG. 10, before being connected to the first hydraulic device 2 and the second hydraulic device 4, the hose 6 includes a cap 68 and a rope 69. The cover 68 protects the end of the hose 6. When attaching the hose 6 to the frame of the bicycle, the hose 6 may be passed through the inside of the frame. In this case, a member provided in the frame in advance to allow the hose 6 to pass therethrough is connected to the rope 69 attached to the hole 681 of the cover 68. Then, the rope 69 is pulled so that the cover 68 enters the inside of the frame. In this embodiment, the surface of the cover 68 is coated with low friction. Thereby, the movement of the hose 6 inside the frame becomes smooth.

(Modification)
FIG. 11 is an enlarged view of the periphery of the plug according to the modification. As shown in FIG. 11, the plug 7A of the modified example includes a cover 75A different from the cover 75 described above. In addition, the same configurations as those of the above-mentioned embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

The cover 75A is integrally provided on the body 71. For example, the body 71 and the cover 75A are integrally molded using a synthetic resin. The cover 75A contains a synthetic resin. The end face of the cover 75A and the main body 71 opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401) is integrated. That is, the cover 75A does not protrude from the end surface of the body 71, but is formed as a part of the disc-shaped end surface of the body 71.

The cover 75A is provided to be able to be detached from the body 71 at least partially. The cover 75A is pushed by the cover 75A in a direction different from the direction away from the hydraulic pressure chamber 201 (hydraulic pressure chamber 401) to open the end of the flow path 73 on the side opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401) Way of composition. When the cover 75A is pushed toward the hydraulic pressure chamber 201 (hydraulic pressure chamber 401), the cover 75A is plastically deformed. Specifically, the cover 75A is plastically deformed and enters the inside of the flow path 73. Thereby, the end of the flow path 73 on the side opposite to the hydraulic pressure chamber 201 (hydraulic pressure chamber 401) is opened. For example, in order to deform the cover 75A, a tip or the like is used.

As mentioned above, although embodiment of this invention was described, embodiment is not limited to the content of these embodiment. In addition, the above-mentioned constituent elements include elements that are easily conceivable by the industry, substantially the same elements, and elements of the so-called equivalent range. Furthermore, the above-mentioned constituent elements can be appropriately combined. Furthermore, various omissions, substitutions, or changes can be made to the constituent elements without departing from the gist of the embodiment described above.

1‧‧‧brake system

2‧‧‧The first hydraulic device

4‧‧‧The second hydraulic device

6‧‧‧ hose

7‧‧‧plug

7A‧‧‧plug

11‧‧‧handle

13‧‧‧rotating body

15‧‧‧ rear fork

21‧‧‧shell

22‧‧‧ Cylinder

23‧‧‧Reservoir

24‧‧‧ Pistons

25‧‧‧ needle

26‧‧‧Threaded sleeve joint

27‧‧‧ Bushing

28‧‧‧ Joystick

29‧‧‧ Fixture

41‧‧‧shell

45‧‧‧ needle

46‧‧‧Threaded Sleeve Joint

47‧‧‧ Bushing

48‧‧‧ Pistons

49‧‧‧brake pads

61‧‧‧Hose body

65‧‧‧Mounting components

66‧‧‧ film

68‧‧‧Cap

69‧‧‧ Rope

71‧‧‧ Ontology

73‧‧‧flow

75‧‧‧ cover

75A‧‧‧cap

77‧‧‧Sealing member

100‧‧‧carton

101‧‧‧ supporting components

201‧‧‧Hydraulic chamber

202‧‧‧Piston chamber

203‧‧‧Hose installation room

211‧‧‧stop

221‧‧‧Thread groove

251‧‧‧Body

256‧‧‧Front end

261‧‧‧Thread groove

281‧‧‧Connection Department

282‧‧‧rotation axis

283‧‧‧ connecting member

284‧‧‧par

401‧‧‧hydraulic room

402‧‧‧Piston chamber

403‧‧‧Hose installation room

404‧‧‧flow

421‧‧‧Thread groove

461‧‧‧Thread groove

611‧‧‧flow

651‧‧‧Body

652‧‧‧ flange

681‧‧‧hole

711‧‧‧concave

FIG. 1 is a schematic diagram of a brake system according to an embodiment.

Fig. 2 is a sectional view of a brake system according to an embodiment.

Fig. 3 is a sectional view of the periphery of a needle according to the embodiment.

Fig. 4 is a sectional view of a hose according to the embodiment.

Fig. 5 is a sectional view of a first hydraulic device according to the embodiment.

Fig. 6 is a sectional view of a second hydraulic device according to the embodiment.

Fig. 7 is a sectional view of the periphery of the plug according to the embodiment.

FIG. 8 is a cross-sectional view of the plug according to the embodiment when the cover is detached.

FIG. 9 is a schematic diagram of a braking system according to an embodiment during transportation.

FIG. 10 is a perspective view of the hose in the embodiment before being connected to the hydraulic device.

FIG. 11 is an enlarged view of the periphery of the plug according to the modification.

Claims (11)

A plug is used for a hydraulic device of a small vehicle including a bicycle, and has: A body, which is arranged at an opening of a hydraulic chamber provided in the hydraulic device; A flow path provided in the main body in fluid communication with the hydraulic chamber; and A cover covering an end portion of the flow path on the side opposite to the hydraulic pressure chamber. As in the plug of claim 1, wherein the cover is integrally provided on the body. The plug according to claim 1 or 2, wherein the cover is configured to be detachable from the body at least partially. In the case of the plug of claim 1 or 2, wherein the cover is pushed by the cover in a direction different from the direction away from the hydraulic chamber, the end of the flow path on the side opposite to the hydraulic chamber Open the way. According to the plug of claim 1 or 2, wherein the cover is formed in a rod shape protruding from an end surface of the body opposite to the hydraulic chamber. The plug of claim 1 or 2, wherein the cover contains a synthetic resin. The plug according to claim 1 or 2, wherein the body contains a synthetic resin. The plug according to claim 1 or 2 further includes a sealing member provided on the main body so as to face the hydraulic device. A hydraulic device provided with the plug according to any one of claims 1 to 8, and A housing having the above-mentioned hydraulic chamber and for installing the above-mentioned plug. If the hydraulic device of claim 9 is further provided with a control lever, and The piston is operated according to the operation of the control lever. If the hydraulic device of claim 9 is further provided with brake pads, and The brake pad is pressed against the piston of the rotating body.