Hydraulic device for human-powered vehicle

Abstract

This invention discloses a hydraulic device comprising a base component, a piston, a sealing ring, and an intermediate component. The base component includes a cylinder bore and an annular groove. The annular groove includes a first inner surface and a second inner surface. The piston is movable relative to the base component from a rest position toward an actuated position in a second direction opposite to a first direction. The piston is also movable relative to the base component from the actuated position toward the rest position in the first direction. The sealing ring includes a first axial surface facing the first direction and a second axial surface facing the second direction. The sealing ring is disposed in the annular groove to define a gap between the first axial surface and the first inner surface. The intermediate component is disposed within this gap.

Description

Technical Field

[0001] This invention relates to a hydraulic device for a human-powered vehicle. Prior Technology

[0002] The human-powered vehicle includes a hydraulic unit configured to generate and / or receive hydraulic pressure. The hydraulic unit includes a cylinder, a piston, and a sealing member. The piston is movably disposed within the cylinder. The cylinder and piston form a chamber filled with fluid. The sealing member is disposed around the piston to slidably contact the piston. As the piston moves relative to the cylinder, the sealing member maintains a seal in the chamber. The sealing member deforms in response to the movement of the piston. Summary of the Invention

[0003] According to a first aspect of the present invention, a hydraulic device for a human-powered vehicle includes a base component, a piston, a sealing ring, and an intermediate component. The base component includes a cylinder bore and an annular groove. The cylinder bore has an inner peripheral surface. The annular groove is disposed on the inner peripheral surface. The annular groove includes a first inner surface and a second inner surface. The first inner surface is spaced apart from the second inner surface in a first direction. The piston is disposed in the cylinder bore. The piston is movable relative to the base component from a rest position toward an actuated position in a second direction opposite to the first direction. The piston is also movable relative to the base component from the actuated position toward the rest position in the first direction. The sealing ring includes a first axial surface facing the first direction and a second axial surface facing the second direction. The sealing ring is disposed in the annular groove to define a gap between the first axial surface and the first inner surface. The intermediate component is disposed in the gap.

[0004] Using the hydraulic device according to the first state, when the piston reaches the rest position, the intermediate component can hold the sealing ring in its initial position or a position substantially the same as the initial position. Therefore, when the piston returns to the rest position, the piston can be held in an appropriate position.

[0005] According to a second embodiment of the present invention, the hydraulic device according to the first embodiment is configured such that the intermediate component is configured to reduce the movement of the first axial surface toward one of the first inner surfaces when the piston moves relative to the base component in the first direction.

[0006] Using the hydraulic device according to the second state, when the piston reaches the rest position, the intermediate component can reliably hold the sealing ring in the initial position or in a position substantially the same as the initial position. Therefore, when the piston returns to the rest position, the piston can be reliably held in the proper position.

[0007] According to a third embodiment of the present invention, the hydraulic device according to the first or second embodiment is configured such that the sealing ring includes a first radial inner end, a first radial outer end, and a first radial length. The first radial inner end is in contact with the piston. The first radial outer end is disposed radially outside the first radial inner end. The first radial length is radially defined between the first radial inner end and the first radial outer end. The intermediate component includes a second radial inner end, a second radial outer end, and a second radial length. The second radial outer end is disposed radially outside the second radial inner end. The second radial length is radially defined between the second radial inner end and the second radial outer end. The second radial length is less than the first radial length.

[0008] Using a hydraulic device according to the third state, a space in the gap can be ensured while providing the intermediate component in the gap.

[0009] According to a fourth embodiment of the present invention, the hydraulic device according to the third embodiment is configured such that the ratio of the second radial length to the first radial length is in the range of 0.2 to 0.6.

[0010] Using a hydraulic device according to the fourth state, the space in the gap can be effectively ensured while providing the intermediate component in the gap.

[0011] According to a fifth embodiment of the present invention, the hydraulic device according to a third or fourth embodiment is configured such that the sealing ring includes a first radial midpoint provided to radially bisect the first radial length. The intermediate member includes a second radial midpoint provided to radially bisect the second radial length. The second radial midpoint of the intermediate member is radially offset from the first radial midpoint of the sealing ring.

[0012] Using a hydraulic device according to the fifth state pattern, the space in the gap can be effectively ensured when the intermediate component is provided in the gap.

[0013] According to a sixth embodiment of the present invention, the hydraulic device according to the fifth embodiment is configured such that the second radial center of the intermediate component is radially offset inward from the first radial center of the sealing ring.

[0014] Using a hydraulic device according to the sixth state, the movement of the first radial inner end of the sealing ring can be effectively reduced when the piston moves relative to the base component in the first direction.

[0015] According to a seventh embodiment of the present invention, the hydraulic device according to any one of the third to sixth embodiments is configured such that the second radial inner end is radially offset outward from the first radial inner end.

[0016] Using a hydraulic device according to the seventh state, contact between the intermediate component and the piston can be reduced or avoided. Therefore, the piston can be moved smoothly when the intermediate component is provided in the gap.

[0017] According to an eighth embodiment of the present invention, the hydraulic device according to any one of the third to seventh embodiments is configured such that the second radially outer end is radially offset inward from the first radially outer end.

[0018] Using a hydraulic device according to the eighth state, the radial external space of the intermediate component in the gap can be effectively ensured when the intermediate component is provided in the gap.

[0019] According to a ninth embodiment of the present invention, the hydraulic device according to any of the third to eighth embodiments is configured such that a first radial distance is radially defined between the first radial inner end and the second radial inner end. A second radial distance is radially defined between the first radial outer end and the second radial outer end. The first radial distance is shorter than the second radial distance.

[0020] Using a hydraulic device according to the ninth state, the movement of the first radial inner end of the sealing ring can be effectively reduced when the piston moves relative to the base component in the first direction.

[0021] According to a tenth embodiment of the present invention, the hydraulic device according to the ninth embodiment is configured such that the ratio of the first radial distance to the second radial distance is in the range of 0.1 to 0.3.

[0022] Using a hydraulic device according to the tenth state, the movement of the first radial inner end of the sealing ring can be reduced more effectively when the piston moves relative to the base component in the first direction.

[0023] According to an eleventh embodiment of the present invention, the hydraulic device according to any one of the first to tenth embodiments is configured such that the sealing ring has a first axial length defined in the first direction. The intermediate component has a second axial length defined in the first direction. The second axial length is less than the first axial length.

[0024] Using the hydraulic device according to the eleventh state, the intermediate component in the annular groove can be used to effectively support the sealing ring.

[0025] According to a twelfth embodiment of the present invention, the hydraulic device according to the eleventh embodiment is configured such that the ratio of the second axial length to the first axial length is in the range of 0.2 to 0.4.

[0026] Using the hydraulic device according to the twelfth state, the intermediate component in the annular groove can be used to more effectively support the sealing ring.

[0027] According to one of the thirteenth embodiments of the present invention, the hydraulic device according to any one of the first to twelfth embodiments is configured such that the intermediate component and the sealing ring are integrally provided as a single-piece unit.

[0028] Using the hydraulic device according to the thirteenth state, the intermediate component can be held in a proper position relative to the sealing ring.

[0029] According to one fourteenth embodiment of the present invention, the hydraulic device according to the thirteenth embodiment is configured such that the sealing ring includes the intermediate component protruding from the first axial surface toward the first inner surface of the annular groove.

[0030] Using the hydraulic device according to the fourteenth state, the intermediate component can be reliably held in a proper position relative to one of the sealing rings.

[0031] According to a fifteenth embodiment of the present invention, the hydraulic device according to any one of the first to twelfth embodiments is configured such that the intermediate component and the base component are integrally provided as a single-piece unit.

[0032] Using the hydraulic device according to the fifteenth state, the intermediate component can be held in a proper position relative to one of the base components.

[0033] According to a sixteenth embodiment of the present invention, the hydraulic device according to the fifteenth embodiment is configured such that the intermediate component protrudes from the first inner surface of the annular groove toward the sealing ring.

[0034] Using the hydraulic device according to the sixteenth state, the intermediate component can be reliably held in the proper position relative to one of the base components.

[0035] According to a seventeenth embodiment of the present invention, the hydraulic device according to any one of the first to sixteenth embodiments is configured such that the intermediate component is a component separate from at least one of the sealing ring and the base component.

[0036] Using the hydraulic device according to the seventeenth state, the intermediate component can be manufactured using materials that are the same as or different from the material of the sealing ring or the base component.

[0037] According to one eighteenth embodiment of the present invention, the hydraulic device according to any one of the first to seventeenth embodiments is configured such that the intermediate component is included in a plurality of intermediate portions arranged in a circumferential direction in the annular groove.

[0038] Using a hydraulic device according to the eighteenth state, the space occupied by the intermediate component in the gap can be reduced.

[0039] According to a nineteenth embodiment of the present invention, the hydraulic device according to the eighteenth embodiment is configured such that the plurality of intermediate portions are spaced apart from each other to define a plurality of spaces arranged in the circumferential direction.

[0040] Using the hydraulic device according to the nineteenth state, the interference of the intermediate component with the flow of hydraulic fluid in the gap can be reduced. This smooths out the venting in the annular groove.

[0041] According to one of the twentieth embodiments of the present invention, the hydraulic device according to the eighteenth or nineteenth embodiment is configured such that the plurality of intermediate portions are arranged at circumferential angles in the circumferential direction.

[0042] Using the hydraulic device according to the twentieth state, the movement of the first axial surface toward the first inner surface in the circumferential direction can be reduced when the piston moves relative to the base component in the first direction.

[0043] According to a twenty-first embodiment of the present invention, the hydraulic device according to any of the eighth to twentieth embodiments is configured such that at least one of the plurality of intermediate portions has a first circumferential length defined in the circumferential direction. At least one of the plurality of spaces has a second circumferential length defined in the circumferential direction. At least one of the plurality of intermediate portions has a radially defined radial portion length. At least one of the first circumferential length and the second circumferential length is greater than the radial portion length.

[0044] Using the hydraulic device according to the twenty-first state, the movement of the first axial surface toward the first inner surface in the circumferential direction can be reliably reduced when the piston moves relative to the base component in the first direction.

[0045] According to a twenty-second embodiment of the present invention, the hydraulic device according to any one of the first to twenty-first embodiments is configured such that the sealing ring includes a contact surface disposed between the first axial surface and the second axial surface for contacting the piston. The contact surface has a radially constant height.

[0046] Using the hydraulic device according to the twenty-second state, the contact between the piston and the sealing ring can be reliably maintained when the piston moves relative to the base component. Simple Explanation of the Diagram

[0047] A more complete understanding of the invention and its many accompanying advantages will be readily obtained when the invention is considered in conjunction with the accompanying drawings and by referring to the following detailed description.

[0048] Figure 1 is a side view of a hydraulic device of a human-powered vehicle according to a first embodiment.

[0049] Figure 2 is a cross-sectional view of one of the hydraulic devices taken along line II-II of Figure 1.

[0050] Figure 3 is a cross-sectional view of one of the hydraulic devices taken along line III-III of Figure 1.

[0051] Figure 4 is a partial cross-sectional view of the hydraulic device shown in Figure 1.

[0052] Figure 5 is a perspective view of a sealing ring and an intermediate component of the hydraulic device shown in Figure 1.

[0053] Figure 6 is another perspective view of the sealing ring and intermediate components of the hydraulic device shown in Figure 1.

[0054] Figure 7 is a cross-sectional view of one of the hydraulic devices taken along line VII-VII of Figure 4.

[0055] Figure 8 is a side view of the sealing ring and intermediate components shown in Figure 5.

[0056] Figure 9 is a cross-sectional view of a hydraulic device taken along line IX-IX of Figure 8.

[0057] Figure 10 is a partial side view of the sealing ring and intermediate components shown in Figure 5.

[0058] Figures 11 to 13 are cross-sectional views of a hydraulic device according to a comparative example (in which intermediate components are omitted), showing the movement of a sealing ring and a piston in the hydraulic device.

[0059] Figures 14 and 15 are cross-sectional views of the hydraulic device, showing the movement of the sealing ring, intermediate components, and piston of the hydraulic device illustrated in Figure 1.

[0060] Figure 16 is a cross-sectional view of a hydraulic device according to a second embodiment.

[0061] Figure 17 is a partial cross-sectional view of the hydraulic device shown in Figure 16.

[0062] Figure 18 is a cross-sectional view of one of the hydraulic devices taken along line XVIII-XVIII of Figure 17.

[0063] Figure 19 is a side view of a sealing ring and an intermediate component of the hydraulic device shown in Figure 17.

[0064] Figure 20 is a cross-sectional view of a hydraulic device taken along line XX-XX in Figure 19.

[0065] Figure 21 is a partial side view of the sealing ring and intermediate components shown in Figure 19.

[0066] Figure 22 is a cross-sectional view of a hydraulic device modified according to one of the first embodiments.

[0067] Figure 23 is a cross-sectional view of a hydraulic device according to another modification of the first embodiment.

[0068] Figure 24 is a cross-sectional view of a hydraulic device modified according to one of the second embodiments.

[0069] Figure 25 is a cross-sectional view of a hydraulic device according to another modification of the second embodiment. Implementation

[0070] Several embodiments will now be described with reference to the accompanying drawings, wherein throughout the various drawings, the same element symbols designate corresponding or identical elements. First Embodiment

[0071] As shown in Figure 1, according to a first embodiment, a human-powered vehicle 2 includes a hydraulic system 10. The human-powered vehicle 2 includes a vehicle body 4, a steering wheel or handlebar 5, a disc brake rotor 6, and a hydraulic operating device 8. The disc brake rotor 6 is rotatable relative to the vehicle body 4 about a rotation axis AR. When the human-powered vehicle 2 moves forward, the disc brake rotor 6 rotates relative to the vehicle body 4 in a driving rotation direction DR. The hydraulic system 10 is configured to be mounted to the vehicle body 4. The hydraulic system 10 is configured to be connected to the hydraulic operating device 8 using a hydraulic hose 9. In this embodiment, the hydraulic system 10 is configured to apply braking force to the disc brake rotor 6 in response to an operation of the hydraulic operating device 8. That is, the hydraulic system 10 includes a disc brake caliper. The hydraulic system 10 includes a front disc brake caliper. However, the hydraulic system 10 may include structures other than a disc brake caliper. The hydraulic system 10 may include a rear or other disc brake caliper.

[0072] For example, the human-powered vehicle 2 is a vehicle powered by the human strength of at least one user (i.e., rider) riding the human-powered vehicle 2. The human-powered vehicle 2 has any number of wheels. For example, the human-powered vehicle 2 has at least one wheel. In this embodiment, the human-powered vehicle 2 is preferably smaller than the size of a four-wheeled car. However, the human-powered vehicle 2 can have any size. For example, the human-powered vehicle 2 can be larger than the size of a four-wheeled car. Examples of the human-powered vehicle 2 include a bicycle, a tricycle, and a scooter. In this embodiment, the human-powered vehicle 2 is a bicycle. An electric assist system including an electric motor can be applied to the human-powered vehicle 2 (e.g., a bicycle) to assist the user's muscle power. That is, the human-powered vehicle 2 can be an electric bicycle.

[0073] In this application, the directional terms “forward,” “backward,” “forward,” “rearward,” “left,” “right,” “lateral,” “upward,” and “downward,” as well as any other similar directional terms, refer to the direction determined based on a user (e.g., a rider) sitting in one of the seats or saddles of the human-powered vehicle 2 and facing one of the steering wheels or handlebars 5. Therefore, such terms used to describe the hydraulic system 10 should be interpreted relative to a human-powered vehicle 2 equipped with the hydraulic system 10, used in an upright riding position on a horizontal surface.

[0074] As shown in Figure 2, the hydraulic device 10 for the human-powered vehicle 2 includes a base component 12. The base component 12 is configured to be mounted to the vehicle body 4 using fasteners such as screws 14.

[0075] The base component 12 includes a cylinder bore. In this embodiment, the base component 12 includes a plurality of cylinder bores 16, 18, 20, and 22. Cylinder bore 16 has an inner peripheral surface 16A. Cylinder bore 18 has an inner peripheral surface 18A. Cylinder bore 20 has an inner peripheral surface 20A. Cylinder bore 22 has an inner peripheral surface 22A. Cylinder bore 16 defines a cylinder axis A1. Cylinder bore 18 defines a cylinder axis A2. Cylinder bore 20 defines a cylinder axis A3. Cylinder bore 22 defines a cylinder axis A4. However, the total number of cylinder bores is not limited to four.

[0076] The base component 12 includes a first base body 24, a second base body 26, and an intermediate space 28. The second base body 26 is fixed to the first base body 24. The intermediate space 28 is disposed between the first base body 24 and the second base body 26. The disc brake rotor 6 is disposed in the intermediate space 28. The first base body 24 includes cylinder bores 16 and 20. The second base body 26 includes cylinder bores 18 and 22.

[0077] The hydraulic device 10 for the human-powered vehicle 2 includes a piston. In this embodiment, the hydraulic device 10 includes a plurality of pistons 36, 38, 40, and 42. Piston 36 is disposed in cylinder bore 16. Piston 38 is disposed in cylinder bore 18. Piston 40 is disposed in cylinder bore 20. Piston 42 is disposed in cylinder bore 22. However, the total number of pistons is not limited to four.

[0078] A pair of opposing pistons 36 and 38 are disposed downstream of one of a pair of opposing pistons 40 and 42 in the driving rotation direction DR. The opposing pistons 36 and 38 have the same outer diameter. The opposing pistons 40 and 42 have the same outer diameter. The outer diameters of pistons 36 and 38 are different from the outer diameters of pistons 40 and 42. In this embodiment, the outer diameters of pistons 36 and 38 are larger than the outer diameters of pistons 40 and 42. However, the outer diameters of pistons 36 and 38 may be equal to or smaller than the outer diameters of pistons 40 and 42.

[0079] The hydraulic device 10 includes a hydraulic chamber. In this embodiment, the hydraulic device 10 includes a plurality of hydraulic chambers 46, 48, 50, and 52 filled with a hydraulic fluid (such as oil). A base component 12 and a piston 36 define a hydraulic chamber 46 in a cylinder bore 16. A base component 12 and a piston 38 define a hydraulic chamber 48 in a cylinder bore 18. A base component 12 and a piston 40 define a hydraulic chamber 50 in a cylinder bore 20. A base component 12 and a piston 42 define a hydraulic chamber 52 in a cylinder bore 22. The hydraulic chambers 46, 48, 50, and 52 are filled with a hydraulic fluid (such as oil). The hydraulic chambers 46, 48, 50, and 52 are connected to a hydraulic chamber 8A (see FIG. 1) of the hydraulic operating device 8 via hydraulic hoses 9.

[0080] The base component 12 includes an annular groove. In this embodiment, the base component 12 includes a plurality of annular grooves 56, 58, 60, and 62. Annular groove 56 is disposed on the inner peripheral surface 16A. Annular groove 58 is disposed on the inner peripheral surface 18A. Annular groove 60 is disposed on the inner peripheral surface 20A. Annular groove 62 is disposed on the inner peripheral surface 22A. However, the total number of annular grooves is not limited to four.

[0081] The hydraulic device 10 for the human-powered vehicle 2 includes a sealing ring. In this embodiment, the hydraulic device 10 includes a plurality of sealing rings 66, 68, 70, and 72. Sealing ring 66 is disposed in an annular groove 56 to contact piston 36. Sealing ring 66 is configured such that if one of the pistons 36 moves more than a predetermined amount, piston 36 can slide relative to sealing ring 66. Sealing ring 68 is disposed in an annular groove 58 to contact piston 38. Sealing ring 68 is configured such that if one of the pistons 38 moves more than a predetermined amount, piston 38 can slide relative to sealing ring 68. Sealing ring 70 is disposed in an annular groove 60 to contact piston 40. Sealing ring 70 is configured such that if one of the pistons 40 moves more than a predetermined amount, piston 40 can slide relative to sealing ring 70. Sealing ring 72 is disposed in an annular groove 62 to contact piston 42. The sealing ring 72 is configured such that if the amount of movement of one of the pistons 42 becomes greater than a predetermined amount, the piston 42 can slide relative to the sealing ring 72. However, the total number of sealing rings is not limited to four.

[0082] The hydraulic device 10 includes a friction element configured to contact the disc brake rotor 6 in response to a movement of a piston. In this embodiment, the hydraulic device 10 includes a plurality of friction elements 74 and 76. Friction elements 74 and 76 are movable relative to the base member 12. Pistons 36 and 40 are configured to move friction element 74 toward the disc brake rotor 6. Pistons 38 and 42 are configured to move friction element 76 toward the disc brake rotor 6.

[0083] Friction component 74 includes a brake pad 74A and a support plate 74B. The brake pad 74A is fixed to the support plate 74B. The brake pad 74A is configured to contact the disc brake rotor 6 in response to movement of pistons 36 and 40. Friction component 76 includes a brake pad 76A and a support plate 76B. The brake pad 76A is fixed to the support plate 76B. The brake pad 76A is configured to contact the disc brake rotor 6 in response to movement of pistons 38 and 42.

[0084] As seen in Figures 2 and 3, the hydraulic device 10 includes a biasing member 78. The biasing member 78 is configured to bias the friction member 74 toward the pistons 36 and 40. The biasing member 78 is configured to bias the friction member 76 toward the pistons 38 and 42.

[0085] As shown in Figure 3, the hydraulic device 10 includes a support rod 80. The support rod 80 is mounted to the base component 12. The support rod 80 is configured to movably support the friction components 74 and 76 and the biasing component 78.

[0086] As shown in Figure 2, the hydraulic device 10 for the human-powered vehicle 2 includes an intermediate component. In this embodiment, the hydraulic device 10 includes a plurality of intermediate components 86, 88, 90, and 92. Intermediate component 86 is disposed in an annular groove 56. Intermediate component 88 is disposed in an annular groove 58. Intermediate component 90 is disposed in an annular groove 60. Intermediate component 92 is disposed in an annular groove 62. However, the total number of intermediate components is not limited to four. If needed and / or desired, at least one of the intermediate components 86, 88, 90, and 92 can be omitted from the hydraulic device 10.

[0087] The annular groove 56, the sealing ring 66, and the intermediate component 86 will be described in detail below. The annular grooves 58, 60, and 62 have a structure substantially identical to that of the annular groove 56. The sealing rings 68, 70, and 72 have a structure substantially identical to that of the sealing ring 66. The intermediate components 88, 90, and 92 have a structure substantially identical to that of the intermediate component 86. Therefore, the description of the annular groove 56, the sealing ring 66, and the intermediate component 86 can be used as a description of the annular grooves 58, 60, and 62, the sealing rings 68, 70, and 72, and the intermediate components 88, 90, and 92.

[0088] As shown in Figure 4, the annular groove 56 includes a first inner surface 56A and a second inner surface 56B. The first inner surface 56A is spaced apart from the second inner surface 56B in a first direction D11. The first inner surface 56A faces the second inner surface 56B. The second inner surface 56B faces the first inner surface 56A. The first direction D11 is parallel to the cylinder axis A1 of the cylinder bore 16. The first inner surface 56A can also be referred to as a first axial groove surface 56A. The second inner surface 56B can also be referred to as a second axial groove surface 56B.

[0089] The annular groove 56 includes a third inner surface 56G. A first inner surface 56A is spaced apart from the third inner surface 56G in a first direction D11. The third inner surface 56G faces the first inner surface 56A. The third inner surface 56G is closer to the first inner surface 56A than the second inner surface 56B. The third inner surface 56G is located radially outside the second inner surface 56B. The third inner surface 56G is configured to contact the sealing ring 66.

[0090] The piston 36 is movable relative to the base component 12 in a second direction D12, opposite to the first direction D11, from a rest position P11 toward an actuated position P12. The piston 36 is movable relative to the base component 12 in the first direction D11 from the actuated position P12 toward the rest position P11.

[0091] In this application, the term "resting position" as used herein refers to a position in which a movable part (such as pistons 36, 38, 40, and 42) remains stationary in a state in which the movable part is not actuated. The term "actuated position" as used herein refers to a position in which the movable part has been actuated to perform the operation of the movable part.

[0092] The sealing ring 66 includes a first axial surface 66A and a second axial surface 66B. The first axial surface 66A faces a first direction D11. The second axial surface 66B faces a second direction D12. The sealing ring 66 is disposed in an annular groove 56 to define a gap CL1 between the first axial surface 66A and the first inner surface 56A in a stationary state in which the piston 36 is in a stationary position P11. When the gap CL1 between the first axial surface 66A and the first inner surface 56A is maintained, the first axial surface 66A is in an initial position P2 relative to the base component 12. When the sealing ring 66 is assembled to the base component 12, the gap CL1 facilitates the insertion of the sealing ring 66 into the annular groove 56.

[0093] In one of the assembled states, the sealing ring 66 is disposed in the annular groove 56, and the sealing ring 66 contacts the third inner surface 56G. Therefore, the sealing ring 66 is disposed in the annular groove 56 to define an additional clearance CL2 between the second axial surface 66B and the second inner surface 56B. The additional clearance CL2 smooths the movement of the piston 36 toward the actuated position P12. The clearance CL1 is greater than the additional clearance CL2. However, if required and / or desired, the clearance CL1 may be equal to or less than the additional clearance CL2. If required and / or desired, the third inner surface 56G may be omitted from the annular groove 56. If required and / or desired, the second inner surface 56B may contact the second axial surface 66B.

[0094] As shown in Figure 5, the first axial surface 66A has an annular shape. The first axial surface 66A includes a flat surface. In this embodiment, the first axial surface 66A is completely flat. However, the shape of the first axial surface 66A is not limited to the shape shown in Figure 5.

[0095] As shown in Figure 6, the second axial surface 66B has an annular shape. The second axial surface 66B includes a flat surface. In this embodiment, the second axial surface 66B is completely flat. However, the shape of the second axial surface 66B is not limited to the shape shown in Figure 6.

[0096] As shown in Figure 4, the intermediate component 86 is disposed in the gap CL1. The intermediate component 86 is configured to reduce the movement of the first axial surface 66A toward one of the first inner surfaces 56A when the piston 36 moves relative to the base component 12 in the first direction D11. The intermediate component 86 is configured to maintain the gap CL1 when the piston 36 moves relative to the base component 12 in the first direction D11.

[0097] The intermediate component 86 is a component separate from at least one of the sealing ring 66 and the base component 12. In this embodiment, the intermediate component 86 is a component separate from the base component 12. The intermediate component 86 and the sealing ring 66 are integrally provided as a single-piece component. That is, the sealing ring 66 includes the intermediate component 86 protruding from the first axial surface 66A toward the first inner surface 56A of the annular groove 56. The intermediate component 86 contacts the first inner surface 56A of the annular groove 56. However, if needed and / or desired, the intermediate component 86 may be integrally provided as a single-piece component with the base component 12. If needed and / or desired, the base component 12 may include the intermediate component 86.

[0098] In this embodiment, the sealing ring 66 is made of an elastic material (such as rubber). The intermediate component 86 is also made of an elastic material (such as rubber). However, the sealing ring 66 may be made of a material other than an elastic material. The intermediate component 86 may also be made of a material other than an elastic material.

[0099] As shown in Figure 7, the intermediate component 86 comprises a plurality of intermediate portions 86A arranged in the circumferential direction D5 of one of the annular grooves 56. The intermediate component 86 comprises a plurality of intermediate portions 86A arranged in the circumferential direction D6 of one of the sealing rings 66. The sealing ring 66 has a central axis A66. In the assembled state, the central axis A66 substantially coincides with the cylinder axis A1 of the cylinder bore 16.

[0100] A plurality of intermediate portions 86A are spaced apart from each other to define a plurality of spaces 86B arranged in the circumferential direction D5. In this embodiment, the total number of intermediate portions 86A is eight. The total number of spaces 86B is eight. However, the total number of intermediate portions 86A is not limited to eight. The total number of spaces 86B is not limited to eight.

[0101] As shown in Figure 4, the gap CL1 includes a radially outer space S1 and a radially inner space S2. The radially outer space S1 is located radially outside the intermediate member 86. The radially inner space S2 is located radially inside the intermediate member 86. As shown in Figure 7, the radially outer space S1 extends in the circumferential direction D5. The radially inner space S2 extends in the circumferential direction D5. The radially outer space S1 communicates with the radially inner space S2 through a plurality of spaces 86B.

[0102] As shown in Figure 8, a plurality of intermediate portions 86A are configured at a fixed circumferential angle AG1 in the circumferential direction D5 or D6. In this embodiment, the fixed circumferential angle AG1 is 45 degrees. The fixed circumferential angle AG1 is defined at the center of the circumference of one of the intermediate portions 86A. The fixed circumferential angle AG1 is defined about the cylinder axis A1 or the central axis A66. However, the plurality of intermediate portions 86A may be configured at different circumferential angles in the circumferential direction D5.

[0103] As shown in Figure 4, the sealing ring 66 includes a first radially inner end 66C and a first radially outer end 66D. The first radially inner end 66C is in contact with the piston 36. The first radially outer end 66D is disposed radially outside the first radially inner end 66C. The sealing ring 66 includes a contact surface 66E disposed between a first axial surface 66A and a second axial surface 66B for contacting the piston 36. The first radially inner end 66C includes the contact surface 66E. The sealing ring 66 includes an additional contact surface 66F. The additional contact surface 66F is disposed between the first axial surface 66A and the second axial surface 66B for contacting the base component 12. The first radially outer end 66D includes the additional contact surface 66F.

[0104] Intermediate component 86 includes a second radially inner end 86C and a second radially outer end 86D. The second radially outer end 86D is disposed radially outside the second radially inner end 86C. Each intermediate portion 86A includes a second radially inner end 86C and a second radially outer end 86D. Intermediate component 86 includes a radially inner surface 86E and a radially outer surface 86F. The radially outer surface 86F is disposed radially outside the radially inner surface 86E. Each intermediate portion 86A includes a radially inner surface 86E and a radially outer surface 86F. The second radially inner end 86C includes the radially inner surface 86E. The second radially outer end 86D includes the radially outer surface 86F.

[0105] The second radial inner end 86C is radially offset outward from the first radial inner end 66C. The second radial outer end 86D is radially offset inward from the first radial outer end 66D. The radial inner surface 86E is radially offset outward from the contact surface 66E. The radial outer surface 86F is radially offset inward from the additional contact surface 66F. The intermediate component 86 is radially spaced from the piston 36. However, if desired and / or expected, the second radial inner end 86C may be positioned in the same radial position as the first radial inner end 66C. If desired and / or expected, the second radial outer end 86D may be positioned in the same radial position as the first radial outer end 66D. If desired and / or expected, the radial inner surface 86E may be positioned in the same radial position as the contact surface 66E. If desired and / or expected, the radial outer surface 86F may be positioned in the same radial position as the additional contact surface 66F.

[0106] As shown in Figure 8, contact surface 66E constitutes one of the inner peripheral surfaces of sealing ring 66. Additional contact surface 66F constitutes one of the outer peripheral surfaces of sealing ring 66. Contact surface 66E has a constant radial height R1. Additional contact surface 66F has a constant radial height R2. Contact surface 66E is defined by the central axis A66. Additional contact surface 66F is defined by the central axis A66. Therefore, contact surface 66E can also be referred to as an inner peripheral surface 66E of the sealing ring. Additional contact surface 66F can also be referred to as an outer peripheral surface 66F of the sealing ring. The constant radial height R1 can also be referred to as a radius R1. The constant radial height R2 can also be referred to as a radius R2. In this embodiment, in the free state of sealing ring 66, the ratio of the constant radial height R1 to the constant radial height R2 is in the range of 0.7 to 0.9. In this embodiment, in the free state of sealing ring 66, the ratio of the constant radial height R1 to the constant radial height R2 is approximately 0.8. Furthermore, in this embodiment, in the free state of the sealing ring 66, the radial constant height R1 is approximately 8.5 mm, and the radial constant height R2 is approximately 10.5 mm. However, the ratio of the radial constant height R1 to the radial constant height R2, as well as the radial constant heights R1 and R2, are not limited to the range, ratio, and length described above.

[0107] As shown in Figure 9, contact surface 66E extends along the central axis A66 between the first axial surface 66A and the second axial surface 66B. Additional contact surface 66F extends along the central axis A66 between the first axial surface 66A and the second axial surface 66B. In the free state of one of the sealing rings 66 separated from the base component 12, contact surface 66E is parallel to the central axis A66. In the free state of the sealing ring 66, additional contact surface 66F is parallel to the central axis A66. However, contact surface 66E may not be parallel to the central axis A66. Additional contact surface 66F may not be parallel to the central axis A66.

[0108] As shown in Figure 4, the annular groove 56 includes an inner peripheral surface 56F. The inner peripheral surface 56F faces radially inward toward the piston 36. The inner peripheral surface 56F is inclined relative to the cylinder axis A1. The inclination of the inner peripheral surface 56F relative to the cylinder axis A1 reduces the inner diameter of the annular groove 56 from the second inner surface 56B to the first inner surface 56A. In the assembled state, the sealing ring 66 is radially compressed inward by the inner peripheral surface 56F of the annular groove 56. Therefore, in the assembled state, the contact surface 66E is in complete contact with the piston 36. The piston 36 is held relative to the base portion 12 by the radial inward compression of the sealing ring 66. Because the inner peripheral surface 56F is inclined relative to the cylinder axis A1, the compression of the sealing ring 66 by the inner peripheral surface 56F increases the holding force of the sealing ring 66 relative to the piston 36 from the second axial surface 66B to the first axial surface 66A.

[0109] As shown in Figure 10, the sealing ring 66 includes a first radial length L11 radially defined between a first radial inner end 66C and a first radial outer end 66D. The intermediate component 86 includes a second radial length L21 radially defined between a second radial inner end 86C and a second radial outer end 86D. At least one intermediate portion 86A of the intermediate portion 86A includes the second radial length L21. The second radial length L21 may also be referred to as a radial portion length L21. Therefore, at least one intermediate portion 86A of the plurality of intermediate portions 86A has a radially defined radial portion length L21. In this embodiment, each of the intermediate portions 86A includes the second radial length L21. The second radial length L21 is less than the first radial length L11. In the free state of the sealing ring 66 and the intermediate component 86, the ratio of the second radial length L21 to the first radial length L11 is in the range of 0.2 to 0.6. In the free state of the sealing ring 66 and the intermediate component 86, the second radial length L21 is less than the first radial length L11. In the free state of the sealing ring 66 and the intermediate component 86, the ratio of the second radial length L21 to the first radial length L11 is in the range of 0.2 to 0.6. In this embodiment, in the free state of the sealing ring 66 and the intermediate component 86, the ratio of the second radial length L21 to the first radial length L11 is approximately 0.4. Furthermore, in this embodiment, in the free state of the sealing ring 66 and the intermediate component 86, the first radial length L11 is approximately 2 mm, and the second radial length L21 is approximately 0.8 mm. However, the second radial length L21 may be equal to or greater than the first radial length L11. The ratio of the second radial length L21 to the first radial length L11, as well as the first radial length L11 and the second radial length L21, are not limited to the ranges, ratios, and lengths described above.

[0110] The radial inner surface 86E has a curved shape. The radial outer surface 86F has a curved shape. The radial inner surface 86E has an arcuate shape with a center on the central axis A66. The radial outer surface 86F has an arcuate shape with a center on the central axis A66. The second radial length L21 of the intermediate portion 86A is constant in the circumferential direction D6. However, the shapes of the radial inner surface 86E and the radial outer surface 86F are not limited to curved shapes. The second radial length L21 does not need to be constant in the circumferential direction D6.

[0111] As shown in Figure 8, the sealing ring 66 includes a first radial midpoint RC11 provided to radially bisect a first radial length L11. The intermediate member 86 includes a second radial midpoint RC12 provided to radially bisect a second radial length L21. In this embodiment, the first radial midpoint RC11 can be indicated by an arcuate shape disposed on an imaginary circle having a center disposed on a central axis A66, as observed along the central axis A66. The second radial midpoint RC12 can be indicated by an arcuate shape disposed on an imaginary circle having a center disposed on a central axis A66, as observed along the central axis A66.

[0112] The second radial midpoint RC12 of the intermediate component 86 is radially offset from the first radial midpoint RC11 of the sealing ring 66. The second radial midpoint RC12 of the intermediate component 86 is radially offset inward from the first radial midpoint RC11 of the sealing ring 66. Compared to the first radial outer end 66D, the intermediate component 86 is radially closer to the first radial inner end 66C. However, the second radial midpoint RC12 of the intermediate component 86 can be positioned in the same radial position as the first radial midpoint RC11 of the sealing ring 66. The second radial midpoint RC12 of the intermediate component 86 can be radially offset outward from the first radial midpoint RC11 of the sealing ring 66. The intermediate component 86 can be positioned in a radially intermediate position between the first radial inner end 66C and the first radial outer end 66D. Compared to the first radial inner end 66C, the intermediate component 86 is radially closer to the first radial outer end 66D.

[0113] As shown in Figure 9, a first radial distance DS1 is radially defined between the first radial inner end 66C and the second radial inner end 86C. A second radial distance DS2 is radially defined between the first radial outer end 66D and the second radial outer end 86D. In this embodiment, the first radial distance DS1 is shorter than the second radial distance DS2. In the free state of the sealing ring 66 and the intermediate component 86, the ratio of the first radial distance DS1 to the second radial distance DS2 is in the range of 0.1 to 0.3. In this embodiment, in the free state of the sealing ring 66 and the intermediate component 86, the ratio of the first radial distance DS1 to the second radial distance DS2 is approximately 0.2. However, the first radial distance DS1 may be equal to or longer than the second radial distance DS2. Furthermore, in this embodiment, in the free state of the sealing ring 66 and the intermediate component 86, the first radial distance DS1 is approximately 0.2 mm, and the second radial distance DS2 is approximately 1 mm. The ratio of the first radial distance DS1 to the second radial distance DS2, and the first radial distance DS1 and the second radial distance DS2 are not limited to the range, ratio, and length described above.

[0114] The sealing ring 66 has a first axial length L12 defined in a first direction D11. The intermediate component 86 has a second axial length L22 defined in the first direction D11. The intermediate portion 86A has a second axial length L22. In this embodiment, the second axial length L22 is less than the first axial length L12. In the free state of the sealing ring 66 and the intermediate component 86, the ratio of the second axial length L22 to the first axial length L12 is in the range of 0.2 to 0.4. In this embodiment, in the free state of the sealing ring 66 and the intermediate component 86, the ratio of the second axial length L22 to the first axial length L12 is approximately 0.3. However, the second axial length L22 may be equal to or greater than the first axial length L12. Furthermore, in this embodiment, in the free state of the sealing ring 66 and the intermediate component 86, the axial length L12 is approximately 2 mm, and the axial length L22 is approximately 0.6 mm. The ratio of the second axial length L22 to the first axial length L12, and the first axial length L12 and the second axial length L22 are not limited to the range, ratio, and length described above.

[0115] As shown in Figure 10, at least one of the plurality of intermediate portions 86A has a first circumferential length L23 defined in the circumferential direction D5 or D6. At least one of the plurality of spaces 86B has a second circumferential length L24 defined in the circumferential direction D5 or D6. The first circumferential length L23 and the second circumferential length L24 are defined on an imaginary line indicating the second radial midpoint RC12, as observed along the central axis A66. At least one of the first circumferential length L23 and the second circumferential length L24 is greater than the radial portion length L21. In this embodiment, the first circumferential length L23 and the second circumferential length L24 are greater than the radial portion length L21. The first circumferential length L23 is equal to the second circumferential length L24. However, if needed and / or desired, at least one of the first circumferential length L23 and the second circumferential length L24 may be equal to or less than the radial portion length L21. If required and / or desired, the first circumference length L23 may differ from the second circumference length L24.

[0116] The movement of piston 36 and sealing ring 66 will be described below with reference to Figures 11 to 15. Figures 11 to 13 show the movement of piston 36 and sealing ring 66 in a hydraulic device 10A without the intermediate component 86 disposed in the gap CL1. Figures 14 and 15 show the movement of piston 36 and sealing ring 66 in a case where the intermediate component 86 is disposed in the gap CL1.

[0117] As shown in Figure 11, piston 36 moves relative to base component 12 in response to hydraulic pressure supplied from hydraulic operating device 8 (Figure 1) to hydraulic chamber 46 (Figure 2). Sealing ring 66 elastically deforms in response to the movement of piston 36. More specifically, as piston 36 moves in the second direction D12 from rest position P11 toward actuated position P12, the first radially inner end 66C of sealing ring 66 moves relative to the first radially outer end 66D in the second direction D12. When piston 36 reaches actuated position P12, the second axial surface 66B of sealing ring 66 contacts the second inner surface 56B of annular groove 56.

[0118] As shown in Figure 12, when the piston 36 returns from the actuated position P12 to the rest position P11 in the first direction D11, the first radial inner end 66C of the sealing ring 66 moves relative to the first radial outer end 66D in the first direction D11. If the intermediate component 86 is not disposed in the gap CL1, when the piston 36 moves toward the rest position P11, the first axial surface 66A approaches the first inner surface 56A of the annular groove 56 in the first direction D11, exceeding the initial position P2 of the first axial surface 66A. When the piston 36 reaches the rest position P11, the first axial surface 66A contacts the first inner surface 56A.

[0119] As shown in Figure 13, after the piston 36 is actuated, the elastic restoring force of the sealing ring 66 moves the piston 36 from the rest position P11 toward the actuated position P12. Therefore, the rest position P11 of the piston 36 is changed to the rest position P11A due to the elastic restoring force of the sealing ring 66.

[0120] As shown in Figure 14, when the piston 36 moves from the rest position P11 toward the actuated position P12 in the second direction D12, the first radial inner end 66C of the sealing ring 66 moves relative to the first radial outer end 66D in the second direction D12. The intermediate component 86, together with the sealing ring 66, moves away from the first inner surface 56A of the annular groove 56.

[0121] However, as seen in Figure 15, if the intermediate component 86 is positioned within the gap CL1, it reduces or restricts the movement of the first axial surface 66A toward the first inner surface 56A in the first direction D11. When the piston 36 reaches the rest position P11, the first axial surface 66A is less likely to move beyond the initial position P2 of the first inner surface 56A in the first direction D11. Therefore, the first radially inner end 66C of the sealing ring 66 essentially stops in its original position corresponding to the rest position P11 of the piston 36. Thus, the intermediate component 86 stabilizes the rest position P11 of the piston 36 regardless of the elastic deformation of the sealing ring 66. Second Embodiment

[0122] A hydraulic device 210 according to a second embodiment will now be described below with reference to Figures 16 to 21. The hydraulic device 210 has the same structure and / or configuration as the hydraulic device 10, except for the intermediate component 86. Therefore, elements having substantially the same function as those in the first embodiment will be numbered the same here, and for the sake of brevity, will not be described and / or illustrated again here.

[0123] As shown in Figure 16, the hydraulic device 210 for the human-powered vehicle 2 includes an intermediate component. In this embodiment, the hydraulic device 210 includes a plurality of intermediate components 286, 288, 290, and 292. Intermediate component 286 is disposed in an annular groove 56. Intermediate component 288 is disposed in an annular groove 58. Intermediate component 290 is disposed in an annular groove 60. Intermediate component 292 is disposed in an annular groove 62. However, the total number of intermediate components is not limited to four. If needed and / or desired, at least one of the intermediate components 286, 288, 290, and 292 can be omitted from the hydraulic device 210.

[0124] The annular groove 56, the sealing ring 66, and the intermediate component 286 will be described in detail below. The annular grooves 58, 60, and 62 have a structure substantially identical to that of the annular groove 56. The sealing rings 68, 70, and 72 have a structure substantially identical to that of the sealing ring 66. The intermediate components 288, 290, and 292 have a structure substantially identical to that of the intermediate component 286. Therefore, the description of the annular groove 56, the sealing ring 66, and the intermediate component 286 can be used as a description of the annular grooves 58, 60, and 62, the sealing rings 68, 70, and 72, and the intermediate components 288, 290, and 292.

[0125] As shown in Figure 17, the intermediate component 286 is disposed in the gap CL1. The intermediate component 286 is configured to reduce the movement of the first axial surface 66A toward the first inner surface 56A when the piston 36 moves relative to the base component 12 in the first direction D11. The intermediate component 286 is configured to maintain the gap CL1 when the piston 36 moves relative to the base component 12 in the first direction D11.

[0126] The intermediate component 286 is a component separate from at least one of the sealing ring 66 and the base component 12. In this embodiment, the intermediate component 286 is a component separate from the base component 12 and the sealing ring 66. The intermediate component 286 contacts the first inner surface 56A of the annular groove 56. The intermediate component 286 contacts the first axial surface 66A of the sealing ring 66. However, if required and / or desired, the intermediate component 286 may be provided integrally with one of the base component 12 and the sealing ring 66 as a single-piece component.

[0127] In this embodiment, the intermediate component 286 is made of an elastic material (such as rubber). However, the intermediate component 286 may be made of a material other than an elastic material.

[0128] The annular groove 56 includes an additional inner peripheral surface 56H. The additional inner peripheral surface 56H faces radially inward toward the piston 36. The additional inner peripheral surface 56H is disposed between the inner peripheral surface 56F and the first inner surface 56A. The additional inner peripheral surface 56H extends along the cylinder axis A1. The additional inner peripheral surface 56H is closer to the piston 36 than the inner peripheral surface 56F. The additional inner peripheral surface 56H is configured to contact the intermediate component 286. Therefore, the additional inner peripheral surface 56H is configured to radially support the intermediate component 286.

[0129] As shown in Figure 18, the intermediate component 286 includes a plurality of intermediate portions 286A disposed in the circumferential direction D5 of the annular groove 56. The plurality of intermediate portions 286A are spaced apart from each other to define a plurality of spaces 286B disposed in the circumferential direction D5. The radially outer space S1 communicates with the radially inner space S2 through the plurality of spaces 286B. In this embodiment, the total number of intermediate portions 286A is two. The total number of spaces 286B is two. However, the total number of intermediate portions 286A is not limited to two. The total number of spaces 286B is not limited to two.

[0130] As shown in Figure 19, a plurality of intermediate portions 286A are arranged at a fixed circumferential angle AG2 in the circumferential direction D5. In this embodiment, the fixed circumferential angle AG1 is 180 degrees. The fixed circumferential angle AG2 is defined at the center of the circumference of one of the intermediate portions 286A. However, the plurality of intermediate portions 286A may be arranged at different circumferential angles in the circumferential direction D5.

[0131] As shown in Figure 17, the intermediate component 286 includes a second radially inner end 286C and a second radially outer end 286D. The second radially outer end 286D is disposed radially outside the second radially inner end 286C. Each of the intermediate portions 286A includes a second radially inner end 286C and a second radially outer end 286D. The intermediate component 286 includes a radially inner surface 286E and a radially outer surface 286F. The radially outer surface 286F is disposed radially outside the radially inner surface 286E. Each of the intermediate portions 286A includes a radially inner surface 286E and a radially outer surface 286F. The second radially inner end 286C includes the radially inner surface 286E. The second radially outer end 286D includes the radially outer surface 286F.

[0132] The second radial inner end 286C is radially offset outward from the first radial inner end 66C. The second radial outer end 286D is radially offset inward from the first radial outer end 66D. The radial inner surface 286E is radially offset outward from the contact surface 66E. The radial outer surface 286F is radially offset inward from the additional contact surface 66F. However, if needed and / or desired, the second radial inner end 286C may be located in the same radial position as the first radial inner end 66C. If needed and / or desired, the second radial outer end 286D may be located in the same radial position as the first radial outer end 66D. If needed and / or desired, the radial inner surface 286E may be located in the same radial position as the contact surface 66E. If needed and / or desired, the radial outer surface 286F may be located in the same radial position as the additional contact surface 66F.

[0133] As shown in Figure 19, the intermediate component 286 includes a second radial length L221 radially defined between a second radial inner end 286C and a second radial outer end 286D. At least one intermediate portion 286A of the intermediate portion 286A includes the second radial length L221. The second radial length L221 may also be referred to as a radial portion length L221. Therefore, at least one intermediate portion 286A of the plurality of intermediate portions 286A has a radially defined radial portion length L221. In this embodiment, each of the intermediate portions 286A includes the second radial length L221. The second radial length L221 is less than the first radial length L11. The ratio of the second radial length L221 to the first radial length L11 is in the range of 0.2 to 0.6. In a free state of the sealing ring 66 and the intermediate component 286, the second radial length L221 is less than the first radial length L11. In the free state of the sealing ring 66 and the intermediate component 286, the ratio of the second radial length L221 to the first radial length L11 is in the range of 0.2 to 0.6. In this embodiment, in the free state of the sealing ring 66 and the intermediate component 286, the ratio of the second radial length L221 to the first radial length L11 is approximately 0.4. However, the second radial length L221 may be equal to or greater than the first radial length L11. The ratio of the second radial length L221 to the first radial length L11 is not limited to the ratio and range described above.

[0134] The radial inner surface 286E has a curved shape. The radial outer surface 286F has a curved shape. The radial inner surface 286E has an arcuate shape with a center on the central axis A66. The radial outer surface 286F has an arcuate shape with a center on the central axis A66. The second radial length L221 of the intermediate portion 286A is constant in the circumferential direction D6. However, the shapes of the radial inner surface 286E and the radial outer surface 286F are not limited to curved shapes. The second radial length L221 does not need to be constant in the circumferential direction D6.

[0135] The intermediate component 286 includes a second radial midpoint RC22 provided to radially bisect a second radial length L221. In this embodiment, the second radial midpoint RC22 can be indicated by an arc shape disposed on an imaginary circle having a center disposed on a central axis A66, as observed along the central axis A66.

[0136] The second radial midpoint RC22 of the intermediate component 286 is radially offset from the first radial midpoint RC11 of the sealing ring 66. The second radial midpoint RC22 of the intermediate component 286 is radially offset outward from the first radial midpoint RC11 of the sealing ring 66. Compared to the first radial inner end 66C, the intermediate component 286 is radially closer to the first radial outer end 66D. However, the second radial midpoint RC22 of the intermediate component 286 can be positioned at the same radial position as the first radial midpoint RC11 of the sealing ring 66. Like the intermediate component 86 of the first embodiment, the second radial midpoint RC22 of the intermediate component 286 can be radially offset inward from the first radial midpoint RC11 of the sealing ring 66.

[0137] As shown in Figure 20, a first radial distance DS21 is radially defined between a first radial inner end 66C and a second radial inner end 286C. A second radial distance DS22 is radially defined between a first radial outer end 66D and a second radial outer end 286D. In this embodiment, the first radial distance DS21 is shorter than the second radial distance DS22. The ratio of the second radial distance DS22 to the first radial distance DS21 is in the range of 0.5 to 0.9. In this embodiment, the ratio of the second radial distance DS22 to the first radial distance DS21 is approximately 0.7. However, the first radial distance DS21 may be equal to or shorter than the second radial distance DS22. The ratio of the second radial distance DS22 to the first radial distance DS21 is not limited to the ratios and ranges described above.

[0138] Intermediate component 286 has a second axial length L222 defined in a first direction D11. Intermediate portion 286A has a second axial length L222. In this embodiment, the second axial length L222 is less than the first axial length L12. The ratio of the second axial length L222 to the first axial length L12 is in the range of 0.2 to 1.0. In this embodiment, the ratio of the second axial length L222 to the first axial length L12 is approximately 0.7. However, the second axial length L222 may be equal to or greater than the first axial length L12. The ratio of the second axial length L222 to the first axial length L12 is not limited to the ratio and range described above.

[0139] As shown in Figure 21, at least one of the plurality of intermediate portions 286A has a first circumferential length L223 defined in the circumferential direction D5 or D6. At least one of the plurality of spaces 286B has a second circumferential length L24 defined in the circumferential direction D5 or D6. The first circumferential length L223 and the second circumferential length L224 are defined on an imaginary line indicating the second radial midpoint RC22, as observed along the central axis A66. At least one of the first circumferential length L223 and the second circumferential length L224 is greater than the radial portion length L221. In this embodiment, the first circumferential length L223 is greater than the radial portion length L221. The second circumferential length L224 is less than the radial portion length L221. The first circumferential length L223 is greater than the second circumferential length L224. However, if needed and / or desired, the first circumferential length L223 may be equal to or less than the radial portion length L221. If needed and / or desired, the first circumference length L223 may be equal to or less than the second circumference length L224.

[0140] The movement of piston 36 and sealing ring 66 is substantially the same as that described in the first embodiment with reference to Figures 14 and 15. Therefore, intermediate component 286 can stabilize the rest position P11 of piston 36 regardless of elastic deformation of sealing ring 66. Revise

[0141] In the first embodiment, as seen in FIG. 4, the intermediate component 86 (e.g., a plurality of intermediate portions 86A) is integrally provided with the sealing ring 66 as a single-piece component and is separate from the base component 12. However, as seen in FIG. 22, the intermediate component 86 (e.g., a plurality of intermediate portions 86A) is integrally provided with the base component 12 as a single-piece component. The intermediate component 86 (e.g., a plurality of intermediate portions 86A) may be a component separate from the sealing ring 66. In the modification depicted in FIG. 22, the intermediate component 86 protrudes from the first inner surface 56A of the annular groove 56 toward the sealing ring 66. As seen in FIG. 23, the intermediate component 86 (e.g., a plurality of intermediate portions 86A) may be a component separate from the base component 12 and the sealing ring 66.

[0142] The structures of the intermediate components 86 shown in Figures 4, 22, and 23 can be combined with each other. For example, at least one portion of the plurality of intermediate portions 86A can be provided integrally with the sealing ring 66 as a single-piece component and / or as a component separate from the sealing ring 66. At least one portion of the plurality of intermediate portions 86A can be provided integrally with the base component 12 as a single-piece component and / or as a component separate from the base component 12.

[0143] In the second embodiment, as seen in FIG17, the intermediate component 286 (e.g., a plurality of intermediate portions 286A) is a separate component from the base component 12 and the sealing ring 66. However, as seen in FIG24, the intermediate component 286 (e.g., a plurality of intermediate portions 286A) can be integrally provided with the sealing ring 66 as a single-piece component. That is, the sealing ring 66 includes an intermediate component 286 protruding from the first axial surface 66A toward the first inner surface 56A of the annular groove 56. As seen in FIG25, the intermediate component 286 (e.g., a plurality of intermediate portions 286A) is integrally provided with the base component 12 as a single-piece component. The intermediate component 286 can protrude from the first inner surface 56A of the annular groove 56 toward the sealing ring 66.

[0144] The structures of the intermediate components 286 shown in Figures 17, 24, and 25 can be combined with each other. For example, at least one portion of the plurality of intermediate portions 286A can be provided integrally with the sealing ring 66 as a single-piece component and / or as a component separate from the sealing ring 66. At least one portion of the plurality of intermediate portions 286A can be provided integrally with the base component 12 as a single-piece component and / or as a component separate from the base component 12.

[0145] In this application, as used herein, the term "comprising" and its derivatives are intended to specify the presence of said features, elements, components, groups, integers, and / or steps, but do not exclude other open-ended terms that do not specify the presence of features, elements, components, groups, integers, and / or steps. This concept also applies to words with similar meanings, such as the terms "having," "comprising," and their derivatives.

[0146] The terms “component,” “section,” “part,” “part,” “element,” “body,” and “structure,” when used in the singular, can have the dual meaning of a single part or a plurality of parts.

[0147] The ordinal numbers such as "first" and "second" used in this application are merely identifiers and have no other meaning (e.g., a specific order and the like). Furthermore, for example, the term "first element" does not imply the existence of a "second element," and the term "second element" does not imply the existence of a "first element."

[0148] As used herein, the term "pair of..." may also cover pairs of elements that have different shapes or structures than each other, except where the pairs of elements have the same shape or structure.

[0149] The terms “a” (or “one”), “one or more” and “at least one” are used interchangeably in this document.

[0150] As used in this invention, the phrase "...at least one of" means "one or more" of the choices to be made. For one instance, as used in this invention, the phrase "...at least one of" means "only one single choice" or "both of two choices" (if the number of choices is two). For other instances, as used in this invention, the phrase "...at least one of" means "only one single choice" or "any combination equal to or greater than two choices" (if the number of choices is equal to or greater than three). For example, the phrase "at least one of A and B" covers (1) A alone; (2) B alone; (3) both A and B. The phrase "at least one of A, B and C" covers (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, in this invention, the phrase "at least one of A and B" does not mean "at least one of A and at least one of B".

[0151] Finally, as used herein, degree terms such as “substantially,” “approximately,” “about,” and “approximately” mean a reasonable deviation of one of the modified terms such that the final result is not significantly altered. All numerical values ​​described in this application may be interpreted as including terms such as “substantially,” “approximately,” “about,” and “approximately.”

[0152] Clearly, given the teachings above, various modifications and variations of the present invention are possible. Therefore, it should be understood that the present invention can be practiced in ways different from those specifically described herein, within the scope of the appended claims.

[0153] 2: Human-powered vehicles 4: Vehicle body 5: Steering or handle 6: Disc brake rotor 8: Hydraulic operating device 8A: Hydraulic chamber 9: Hydraulic hose 10: Hydraulic device 10A: Hydraulic device 12: Base components 14: Screws 16: Cylinder bore 16A: Inner peripheral surface 18: Cylinder bore 18A: Inner peripheral surface 20: Cylinder bore 20A: Inner peripheral surface 22: Cylinder inner bore 22A: Inner peripheral surface 24: First base body 26: Second base body 28: Intermediate Space 36: Piston 38: Piston 40: Piston 42: Piston 46: Hydraulic chamber 48: Hydraulic chamber 50: Hydraulic chamber 52: Hydraulic chamber 56: Annular groove 56A: First inner surface / First axial groove surface 56B: Second inner surface / Second axial groove surface 56F: Inner peripheral surface 56G: Third inner surface 56H: Additional inner peripheral surface 58: Annular groove 60: Annular groove 62: Annular groove 66: Sealing ring 66A: First axial surface 66B: Second axial surface 66C: First radial inner end 66D: First radial outer end 66E: Contact surface / inner peripheral surface of sealing ring 66F: Additional contact surface / outer peripheral surface of the sealing ring 68: Sealing ring 70: Sealing ring 72: Sealing ring 74: Friction components 74A: Brake pads 74B: Support plate 76: Friction components 76A: Brake Pads 76B: Support plate 78: Bias Components 80: Support rod 86: Intermediate components 86A: Middle section 86B: Space 86C: Second radial inner end 86D: Second radial outer end 86E: Radial inner surface 86F: Radial outer surface 88: Intermediate components 90: Intermediate components 92: Intermediate components 210: Hydraulic device 286: Intermediate components 286A: Middle section 286B: Space 286C: Second radial inner end 286D: First radial outer end 286E: Radial inner surface 286F: Radial outer surface 288: Intermediate Components 290: Intermediate components 292: Intermediate components A1: Cylinder axis A2: Cylinder axis A3: Cylinder axis A4: Cylinder axis A66: Central Axis AG1: Fixed Angle of Circumference AG2: Fixed Angle of Circumference AR: Rotation axis CL1: Gap CL2: Additional gap D5: Circumferential direction D6: Circumferential direction D11: First Direction D12: Second Direction DR: Drive rotation direction DS1: First radial distance DS2: Second radial distance DS21: First radial distance DS22: Second radial distance L11: First radial length L12: First axial length L21: Second radial length / radial portion length L22: Second axial length L23: Length of the first circumference L24: Length of the second circumference L221: Second radial length L222: Second axial length L223: Length of the first circumference L224: Length of the second circumference P2: Initial position P11: Stationary position P11A: Stationary position P12: Actuated position R1: Constant radial height / radius R2: Constant radial height / radius RC11: First radial center RC12: Second radial center RC22: Second radial center S1: Radial outer space S2: Radial internal space

Claims

1. A hydraulic device for a human-powered vehicle, comprising: A base component comprising: a cylinder bore having an inner peripheral surface; And an annular groove disposed on the inner peripheral surface, the annular groove including a first inner surface and a second inner surface, the first inner surface being spaced apart from the second inner surface in a first direction; A piston disposed within the cylinder bore, movable relative to a base component in a second direction opposite to the first direction from a rest position to an actuated position, and movable relative to the base component in the first direction from the actuated position to the rest position; a sealing ring including a first axial surface facing the first direction and a second axial surface facing the second direction, the sealing ring being disposed in an annular groove to define a gap between the first axial surface and a first inner surface; and an intermediate component disposed within the gap; the sealing ring including a first radially inner end that contacts the piston, a first radially outer end disposed radially outside the first radially inner end, and a first radial length radially defined between the first radially inner end and the first radially outer end; the intermediate component including a second radially inner end. A second radial outer end is disposed radially outside the second radial inner end, and a second radial length is radially defined between the second radial inner end and the second radial outer end, and the second radial length is less than the first radial length.

2. The hydraulic device of claim 1, wherein the intermediate component is configured to reduce the movement of the first axial surface toward one of the first inner surfaces when the piston moves relative to the base component in the first direction.

3. The hydraulic device of claim 1, wherein the ratio of the second radial length to one of the first radial lengths is in the range of 0.2 to 0.

6.

4. The hydraulic device of claim 1, wherein the sealing ring includes a first radial midpoint provided to radially divide the first radial length, the intermediate member includes a second radial midpoint provided to radially divide the second radial length, and the second radial midpoint of the intermediate member is radially offset from the first radial midpoint of the sealing ring.

5. The hydraulic device of claim 4, wherein the second radial center of the intermediate component is radially offset inward from the first radial center of the sealing ring.

6. The hydraulic device of claim 1, wherein the second radial inner end is radially offset outward from the first radial inner end.

7. The hydraulic device of claim 1, wherein the second radially outer end is radially offset inward from the first radially outer end.

8. The hydraulic device of claim 1, wherein a first radial distance is radially defined between the first radial inner end and the second radial inner end, a second radial distance is radially defined between the first radial outer end and the second radial outer end, and the first radial distance is shorter than the second radial distance.

9. The hydraulic device of claim 8, wherein the ratio of the first radial distance to one of the second radial distances is in the range of 0.1 to 0.

3.

10. The hydraulic device of claim 1, wherein the sealing ring has a first axial length defined in the first direction, the intermediate member has a second axial length defined in the first direction, and the second axial length is less than the first axial length.

11. The hydraulic device of claim 1, wherein the intermediate component and the sealing ring are provided as a single, monolithic component.

12. The hydraulic device of claim 11, wherein the sealing ring includes the intermediate member projecting from the first axial surface toward the first inner surface of the annular groove.

13. The hydraulic device of claim 1, wherein the intermediate component is a component separate from at least one of the sealing ring and the base component.

14. The hydraulic device of claim 1, wherein the intermediate component comprises a plurality of intermediate portions arranged in a circumferential direction in one of the annular grooves.

15. The hydraulic device of claim 1, wherein the sealing ring includes a contact surface disposed between the first axial surface and the second axial surface for contacting the piston, and the contact surface has a radially constant height.

16. A hydraulic device for a human-powered vehicle, comprising: A base component comprising: a cylinder bore having an inner peripheral surface; And an annular groove disposed on the inner peripheral surface, the annular groove including a first inner surface and a second inner surface, the first inner surface being spaced apart from the second inner surface in a first direction; A piston disposed within the bore of the cylinder, the piston being movable relative to the base component in a second direction opposite to the first direction from a rest position toward an actuated position, the piston being movable relative to the base component in the first direction from the actuated position toward the rest position; a sealing ring including a first axial surface facing the first direction and a second axial surface facing the second direction, the sealing ring being disposed in the annular groove to define a gap between the first axial surface and the first inner surface; and an intermediate component disposed in the gap; the sealing ring having a first axial length defined in the first direction, the intermediate component having a second axial length defined in the first direction, and the second axial length being less than the first axial length; the ratio of the second axial length to the first axial length being in the range of 0.2 to 0.

4.

17. A hydraulic device for a human-powered vehicle, comprising: A base component comprising: a cylinder bore having an inner peripheral surface; And an annular groove disposed on the inner peripheral surface, the annular groove including a first inner surface and a second inner surface, the first inner surface being spaced apart from the second inner surface in a first direction; A piston disposed within the cylinder bore, the piston being movable relative to the base component from a rest position toward an actuated position in a second direction opposite to the first direction, the piston being movable relative to the base component from the actuated position toward the rest position in the first direction; a sealing ring including a first axial surface facing the first direction and a second axial surface facing the second direction, the sealing ring being disposed in the annular groove to define a gap between the first axial surface and the first inner surface; and an intermediate component disposed in the gap; the intermediate component and the base component are integrally provided as a single-piece unit.

18. The hydraulic device of claim 17, wherein the intermediate component protrudes from the first inner surface of the annular groove toward the sealing ring.

19. A hydraulic device for a human-powered vehicle, comprising: A base component comprising: a cylinder bore having an inner peripheral surface; And an annular groove disposed on the inner peripheral surface, the annular groove including a first inner surface and a second inner surface, the first inner surface being spaced apart from the second inner surface in a first direction; A piston disposed within the cylinder bore, the piston being movable relative to the base component from a rest position toward an actuated position in a second direction opposite to the first direction, the piston being movable relative to the base component from the actuated position toward the rest position in the first direction; a sealing ring comprising a first axial surface facing the first direction and a second axial surface facing the second direction, the sealing ring being disposed in the annular groove to define a gap between the first axial surface and the first inner surface; and an intermediate component disposed in the gap; the intermediate component comprising a plurality of intermediate portions disposed in a circumferential direction of the annular groove; the plurality of intermediate portions being spaced apart from each other to define a plurality of spaces disposed in the circumferential direction.

20. The hydraulic device of claim 19, wherein the plurality of intermediate portions are arranged at circumferential angles in the circumferential direction.

21. The hydraulic device of claim 19, wherein at least one of the plurality of intermediate portions has a first circumferential length defined in the circumferential direction, at least one of the plurality of spaces has a second circumferential length defined in the circumferential direction, at least one of the plurality of intermediate portions has a radially defined radial portion length, and at least one of the first circumferential length and the second circumferential length is greater than the radial portion length.

22. A hydraulic device for a human-powered vehicle, comprising: A base component comprising: a cylinder bore having an inner peripheral surface; And an annular groove disposed on the inner peripheral surface, the annular groove including a first inner surface and a second inner surface, the first inner surface being spaced apart from the second inner surface in a first direction; A piston disposed within the bore of the cylinder, the piston being movable relative to the base component from a rest position toward an actuated position in a second direction opposite to the first direction, the piston being movable relative to the base component from the actuated position toward the rest position in the first direction; a sealing ring including a first axial surface facing the first direction and a second axial surface facing the second direction, the sealing ring being disposed in the annular groove to define a gap between the first axial surface and the first inner surface; and an intermediate component disposed in the gap; the annular groove including a third inner surface; the first inner surface being spaced apart from the third inner surface in the first direction; the third inner surface facing the first inner surface; the third inner surface being closer to the first inner surface than the second inner surface; The third inner surface is constructed to contact the sealing ring.

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