Brake system and saddle-ride type vehicle

Abstract

Provided is a brake system which can execute anti-lock brake control on both the front wheel and the rear wheel of a saddle riding-type vehicle, and of which the steerability can be more improved than conventional technology. This brake system for a saddle riding-type vehicle can execute anti-lock brake control by controlling the pressure of a brake fluid supplied to a wheel cylinder, the brake system comprising: a front wheel-side liquid pressure control device which is attached to a handlebar and controls the pressure of the brake fluid supplied to the wheel cylinder of a front wheel-side brake part; and a rear wheel-side liquid pressure control device which is attached to the handlebar and controls the pressure of the brake fluid supplied to the wheel cylinder of a rear wheel-side brake part, wherein both the front wheel-side liquid pressure control device and the rear wheel-side liquid pressure control device serve as a liquid pressure control device comprising a master cylinder integrated-type substrate.

Description

Technical Field

[0001] The present invention relates to a braking system mounted on a saddle-type vehicle and a saddle-type vehicle equipped with the braking system.

Background Art

[0002] Conventional saddle-type vehicles include those equipped with a braking system capable of performing antilock brake control, which controls the braking force of the wheels by controlling the hydraulic pressure of the brake fluid. In addition, there has been proposed a conventional braking system capable of performing antilock brake control on both the front and rear wheels of a saddle-type vehicle (see Patent Document 1).

[0003] In the case of a conventional braking system capable of performing antilock brake control on both the front and rear wheels of a saddle-type vehicle, when a rider grips a brake lever provided around the handlebar of the saddle-type vehicle, the piston of the master cylinder for front-wheel braking is pressed by the brake lever, and the pressure of the brake fluid supplied to the wheel cylinder of the front-wheel side braking portion increases. Also, in the case of a conventional braking system capable of performing antilock brake control on both the front and rear wheels of a saddle-type vehicle, when a rider steps on the brake pedal with their foot, the piston of the master cylinder for rear-wheel braking is pressed by the brake pedal, and the pressure of the brake fluid supplied to the wheel cylinder of the rear-wheel side braking portion increases. Hereinafter, a conventional braking system capable of performing antilock brake control on both the front and rear wheels of a saddle-type vehicle may sometimes be simply referred to as a conventional braking system.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, in a conventional braking system, the piston of the master cylinder for front-wheel braking is pressed by a brake lever, and the piston of the master cylinder for rear-wheel braking is pressed by a brake pedal. Therefore, in a conventional braking system, when mounted on a saddle-type vehicle, the configuration for front-wheel braking in the braking system is to be attached to the handlebar. At this time, the configuration for front-wheel braking in the braking system is attached near the end of the handlebar on the side where the brake lever is provided. That is, the configuration for front-wheel braking in the braking system is biased and attached to one end of the handlebar. For this reason, in a conventional braking system, when mounted on a saddle-type vehicle, there is a problem that the left-right weight distribution of the attachments to the handlebar becomes uneven, and the steerability of the saddle-type vehicle deteriorates.

[0006] The present invention has been made against the background of the above problems, and is a braking system capable of performing antilock brake control on both the front wheels and the rear wheels of a saddle-type vehicle, and an object thereof is to obtain a braking system capable of improving the steerability of the saddle-type vehicle more than before. Further, an object of the present invention is to obtain a saddle-type vehicle equipped with such a braking system.

Means for Solving the Problems

[0007] The braking system according to the present invention is a braking system for a saddle-type vehicle capable of performing antilock braking control by controlling the pressure of the brake fluid supplied to a wheel cylinder, and is attached to a handlebar and controls the pressure of the brake fluid supplied to the wheel cylinder of the front-wheel side braking portion. A front-wheel side hydraulic pressure control device, and a rear-wheel side hydraulic pressure control device attached to the handlebar and controlling the pressure of the brake fluid supplied to the wheel cylinder of the rear-wheel side braking portion, and both the front-wheel side hydraulic pressure control device and the rear-wheel side hydraulic pressure control device are provided with a piston mounting hole in which a piston of a master cylinder is reciprocally movable, and an internal flow path that forms a part of a flow path of the brake fluid that communicates the piston mounting hole and the wheel cylinder. A master cylinder integrated type base body, and a control valve that opens and closes the internal flow path and adjusts the pressure of the brake fluid supplied to the wheel cylinder.

[0008] Moreover, the saddle-type vehicle according to the present invention includes the braking system according to the present invention.

Effects of the Invention

[0009] In the braking system according to the present invention, both the front-wheel side hydraulic pressure control device and the rear-wheel side hydraulic pressure control device having a master cylinder integrated type base body are attached to the handlebar of the saddle-type vehicle. The hydraulic pressure control device having a master cylinder integrated type base body is configured such that the piston of the master cylinder is pressed when the brake lever is gripped by the rider's hand. For this reason, when the braking system according to the present invention is mounted on a saddle-type vehicle, one of the front-wheel side hydraulic pressure control device and the rear-wheel side hydraulic pressure control device is provided around the left-hand side gripping portion of the handlebar. Further, the other of the front-wheel side hydraulic pressure control device and the rear-wheel side hydraulic pressure control device is provided around the right-hand side gripping portion of the handlebar. For this reason, in the braking system according to the present invention, when mounted on a saddle-type vehicle, the weight distribution in the left-right direction of the attachments to the handlebar becomes more uniform than before, and the steerability of the saddle-type vehicle is improved compared to before.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0011] Hereinafter, a braking system according to the present invention and a saddle-riding type vehicle equipped with the braking system will be described with reference to the drawings.

[0012] In the following, the case where the present invention is applied to a bicycle (e.g., a two-wheeled bicycle, a three-wheeled bicycle, etc.) will be described. However, the present invention may be applied to other saddle-riding type vehicles other than bicycles. The saddle-riding type vehicle generally means a vehicle on which a rider straddles and rides. Other saddle-riding type vehicles other than bicycles are, for example, motorcycles, three-wheeled motorcycles, and buggies, etc., which have at least one of an engine and an electric motor as a driving source. Also, a bicycle generally means a vehicle that can be propelled on the road by the pedaling force applied to the pedals. That is, bicycles include ordinary bicycles, electric assist bicycles, electric bicycles, etc. Also, a motorcycle or a three-wheeled motorcycle means a so-called motorbike, and motorbikes include motorcycles, scooters, electric scooters, etc.

[0013] Also, the configurations, operations, etc. described below are examples, and the braking system and the saddle-riding type vehicle according to the present invention are not limited to such configurations, operations, etc.

[0014] Also, in each figure, the same or similar members or parts are labeled with the same reference numerals, or the labeling is omitted. Also, for the detailed structure, the illustration is appropriately simplified or omitted. Also, for the overlapping explanations, they are appropriately simplified or omitted.

[0015] <Mounting of the Braking System on a Bicycle> The mounting of the braking system according to the embodiment on a bicycle will be described. FIG. 1 is a side view showing a schematic configuration of a bicycle equipped with the braking system according to the embodiment of the present invention. FIG. 2 is a plan view showing the periphery of the handlebar of the bicycle equipped with the braking system according to the embodiment of the present invention. In FIG. 1, the left side of the paper surface is the front of the bicycle 200. Also, in FIG. 2, the upper side of the paper surface is the front of the bicycle 200. Also, FIG. 2 shows a state where the brake lever 241 is not grasped by the rider. Also, in FIG. 2, a part of the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 is shown in cross section.

[0016] The bicycle 200 equipped with the braking system 100 includes a frame 210, a turning part 230, a saddle 218, pedals 219, a rear wheel 220, a rear-wheel side braking part 252, and a brake lamp 221.

[0017] The frame 210 includes, for example, a head tube 211 that pivotally supports the steering column 231 of the turning part 230, a top tube 212 and a down tube 213 connected to the head tube 211, a seat tube 214 connected to the top tube 212 and the down tube 213 and holding the saddle 218, and stays 215 connected to the upper and lower ends of the seat tube 214 and holding the rear wheel 220 and the rear-wheel side braking part 252.

[0018] The turning part 230 includes, for example, a steering column 231, a handle stem 232 held by the steering column 231, a handlebar 233 held by the handle stem 232, a brake lever 241 provided around the handlebar 233, a front fork 216 connected to the steering column 231, a front wheel 217 rotatably held by the front fork 216, and a front-wheel side braking part 251. The front fork 216 is provided on both sides of the front wheel 217. One end of the front fork 216 is connected to the steering column 231, and the other end is connected to the rotation center of the front wheel 217. That is, the front wheel 217 is rotatably held between a pair of front forks 216. Note that the front fork 216 may be a front fork with a suspension.

[0019] The bicycle 200 according to this embodiment includes two brake levers 241. Specifically, as shown in FIG. 2, the brake system 100 includes a front-wheel side hydraulic control device 1 for performing antilock brake control on the front wheel 217 and a rear-wheel side hydraulic control device 2 for performing antilock brake control on the rear wheel 220. The front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 include a master cylinder integrated type base 10 as will be described later. The hydraulic control device having the master cylinder integrated type base is attached to the handlebar, and the piston of the master cylinder is pressed by a brake lever held by the rider's hand. Therefore, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 are attached to the handlebar 233. And the bicycle 200 includes a brake lever 241 for the front-wheel side hydraulic control device 1 and a brake lever 241 for the rear-wheel side hydraulic control device 2.

[0020] When both the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 are attached to the handlebar 233, one of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is provided around the grip portion 234 of the handlebar 233 that is gripped by the rider's left hand (the left grip portion 234). Also, the other of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is provided around the grip portion 234 of the handlebar 233 that is gripped by the rider's right hand (the right grip portion 234). Therefore, in the brake system 100 according to this embodiment, when mounted on the bicycle 200, the left-right weight distribution of the attachments to the handlebar 233 becomes more uniform than before, and the steerability of the bicycle 200 is improved compared to before. In FIG. 2, an example is shown in which the rear-wheel side hydraulic control device 2 is provided around the grip portion 234 gripped by the rider's left hand, and the front-wheel side hydraulic control device 1 is provided around the grip portion 234 gripped by the rider's right hand.

[0021] For example, a power unit 260 that serves as the power source for the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is attached to the down tube 213 of the frame 210. The power unit 260 may be a battery or a generator. Examples of the generator include those that generate electricity by the running of the bicycle 200 (for example, a hub dynamo that generates electricity by the rotation of the front wheel 217 or the rear wheel 220, a motor that is a drive source of the front wheel 217 or the rear wheel 220 and generates regenerative power, etc.), and those that generate electricity by sunlight.

[0022] That is, the bicycle 200 is equipped with a brake system 100 that includes at least a brake lever 241, a front-wheel side braking portion 251, a rear-wheel side braking portion 252, a front-wheel side hydraulic control device 1, a rear-wheel side hydraulic control device 2, and a power unit 260. The brake system 100 can execute an anti-lock brake control for the front wheel 217 by controlling the pressure of the brake fluid of the front-wheel side braking portion 251 with the front-wheel side hydraulic control device 1. Also, the brake system 100 can execute an anti-lock brake control for the rear wheel 220 by controlling the pressure of the brake fluid of the rear-wheel side braking portion 252 with the rear-wheel side hydraulic control device 2.

[0023] The brake lamp 221 lights up when at least one of the front wheel 217 and the rear wheel 220 is braked.

[0024] <Configuration of the Brake System>

[0025] The configuration of the brake system according to the embodiment will be described. FIG. 3 is a diagram showing the schematic configuration of the brake system according to the embodiment of the present invention. As described above, the braking system 100 includes a front-wheel-side hydraulic control device 1 and a rear-wheel-side hydraulic control device 2. The front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 include a master cylinder integrated base 10. Specifically, although details will be described later, a piston mounting hole 21 in which a piston 51 of the master cylinder 50 is reciprocally movable is formed in the base 10. The master cylinder 50 is constituted by the piston mounting hole 21 and the piston 51. Further, a wheel cylinder port 45 and an internal flow path 40 that communicates the piston mounting hole 21 and the wheel cylinder port 45 are formed in the base 10. Further, a reservoir tank 52 that is connected to the piston mounting hole 21 and stores brake fluid is formed in the base 10.

[0026] The internal flow path 40 is a flow path for brake fluid. The internal flow path 40 includes, for example, a first flow path 41, a second flow path 42, a third flow path 43, and a fourth flow path 44. The piston mounting hole 21 of the master cylinder 50 and the wheel cylinder port 45 communicate with each other via the first flow path 41 and the second flow path 42. Further, an end portion on the inlet side of the third flow path 43 is connected to an intermediate portion of the second flow path 42.

[0027] To the wheel cylinder port 45 of the base 10 of the front-wheel side hydraulic control device 1, the front-wheel side braking unit 251 is connected via the liquid pipe 101. The front-wheel side braking unit 251 includes a wheel cylinder 253 and a rotor 254. The wheel cylinder 253 of the front-wheel side braking unit 251 is attached to, for example, the front fork 216. The wheel cylinder 253 of the front-wheel side braking unit 251 is provided with a piston portion (not shown) that moves in conjunction with the pressure of the liquid pipe 101, and is connected to the outlet side of the second flow path 42 of the front-wheel side hydraulic control device 1 via the liquid pipe 101 and the wheel cylinder port 45. That is, the wheel cylinder port 45 of the base 10 of the front-wheel side hydraulic control device 1 is connected to the liquid pipe 101 that communicates with the wheel cylinder 253 of the front-wheel side braking unit 251. The rotor 254 of the front-wheel side braking unit 251 is held by the front wheel 217 and rotates together with the front wheel 217. By the movement of the piston portion of the wheel cylinder 253 of the front-wheel side braking unit 251, a brake pad (not shown) is pressed against the rotor 254 of the front-wheel side braking unit 251, thereby braking the front wheel 217.

[0028] To the wheel cylinder port 45 of the base 10 of the rear-wheel side hydraulic control device 2, the rear-wheel side braking unit 252 is connected via the liquid pipe 101. The rear-wheel side braking unit 252 includes a wheel cylinder 253 and a rotor 254, similar to the front-wheel side braking unit 251. The wheel cylinder 253 of the rear-wheel side braking unit 252 is attached to, for example, the stay 215. The wheel cylinder 253 of the rear-wheel side braking unit 252 is provided with a piston portion (not shown) that moves in conjunction with the pressure of the liquid pipe 101, and is connected to the outlet side of the second flow path 42 of the rear-wheel side hydraulic control device 2 via the liquid pipe 101 and the wheel cylinder port 45. That is, the wheel cylinder port 45 of the base 10 of the rear-wheel side hydraulic control device 2 is connected to the liquid pipe 101 that communicates with the wheel cylinder 253 of the rear-wheel side braking unit 252. The rotor 254 of the rear-wheel side braking unit 252 is held by the rear wheel 220 and rotates together with the rear wheel 220. By the movement of the piston portion of the wheel cylinder 253 of the rear-wheel side braking unit 252, a brake pad (not shown) is pressed against the rotor 254 of the rear-wheel side braking unit 252, thereby braking the rear wheel 220.

[0029] That is, the internal flow path 40 formed in the base body 10 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is a part of the flow path of the brake fluid that communicates the piston mounting hole 21 and the wheel cylinder 253.

[0030] In addition, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 are provided with a control valve 55 that opens and closes the internal flow path 40 and adjusts the pressure of the brake fluid supplied to the wheel cylinder 253. The control valve 55 is provided on the base body 10. In the present embodiment, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 are provided with an inlet valve 56 and an outlet valve 57 as the control valve 55.

[0031] The inlet valve 56 is provided between the outlet side of the first flow path 41 and the inlet side of the second flow path 42, and opens and closes the flow of the brake fluid between the first flow path 41 and the second flow path 42. That is, the inlet valve 56 opens and closes the flow path through which the brake fluid flowing from the piston mounting hole 21 to the wheel cylinder 253 in the internal flow path 40 passes. The outlet valve 57 is provided between the outlet side of the third flow path 43 and the inlet side of the fourth flow path 44, and opens and closes the flow of the brake fluid between the third flow path 43 and the fourth flow path 44. The pressure of the brake fluid is controlled by the opening and closing operations of the inlet valve 56 and the outlet valve 57.

[0032] In addition, the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 include a first coil 61 as a drive source for the inlet valve 56 and a second coil 62 as a drive source for the outlet valve 57. For example, when the first coil 61 is in a non-energized state, the inlet valve 56 opens the flow of brake fluid in both directions. When the first coil 61 is energized, the inlet valve 56 closes to block the flow of brake fluid. That is, in the present embodiment, the inlet valve 56 is an electromagnetic valve that is open when non-energized. Also, for example, when the second coil 62 is in a non-energized state, the outlet valve 57 blocks the flow of brake fluid. When the second coil 62 is energized, the outlet valve 57 opens to allow the flow of brake fluid in both directions. That is, in the present embodiment, the outlet valve 57 is an electromagnetic valve that is closed when non-energized.

[0033] Moreover, an accumulator 58 is formed in the base body 10 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2. The accumulator 58 is connected to the outlet side of the fourth flow path 44 and stores the brake fluid that has passed through the outlet valve 57. That is, the outlet valve 57 opens and closes the flow path in the internal flow path 40 through which the brake fluid flows from the wheel cylinder 253 to the accumulator 58.

[0034] In addition, the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 are provided with a pressure sensor 59 for detecting the pressure of the brake fluid in the internal flow path 40. The pressure sensor 59 is provided on the base body 10. In the present embodiment, the pressure sensor 59 detects the pressure of the brake fluid applying pressure to the wheel cylinder 253. For example, the pressure sensor 59 communicates with the second flow path 42.

[0035] Further, the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 include a control device 70 that controls the opening and closing operation of the control valve 55 based on the detection result of the pressure sensor 59. Note that each part of the control device 70 may be arranged together or may be arranged dispersedly. Also, at least a part of the control device 70 of the front-wheel-side hydraulic control device 1 and at least a part of the control device 70 of the rear-wheel-side hydraulic control device 2 may be arranged together. The control device 70 may be configured to include, for example, a microcomputer, a microprocessor unit, etc., or may be configured to include something that can be updated such as firmware, or may be configured to include a program module executed by a command from a CPU or the like. For example, the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 is configured as follows.

[0036] FIG. 4 is a block diagram showing the front-wheel-side hydraulic control device according to an embodiment of the present invention. Also, FIG. 5 is a block diagram showing the rear-wheel-side hydraulic control device according to an embodiment of the present invention. The detection result of the pressure sensor 59 is input to the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2. Also, in the present embodiment, the detection result of the front-wheel-side wheel speed sensor 271 that detects the rotational speed of the front wheel 217 is input to the control device 70 of the front-wheel-side hydraulic control device 1 as a detection device that detects information on the traveling state of the bicycle 200. Then, the control device 70 of the front-wheel-side hydraulic control device 1 determines the lock or the possibility of lock of the front wheel 217 based on the detection result of the front-wheel-side wheel speed sensor 271. Also, in the present embodiment, the detection result of the rear-wheel-side wheel speed sensor 272 that detects the rotational speed of the rear wheel 220 is input to the control device 70 of the rear-wheel-side hydraulic control device 2 as a detection device that detects information on the traveling state of the bicycle 200. Then, the control device 70 of the rear-wheel-side hydraulic control device 2 determines the lock or the possibility of lock of the rear wheel 220 based on the detection result of the rear-wheel-side wheel speed sensor 272.

[0037] The control device 70 includes an operation determination unit 73 and a control unit 74 as functional units. The operation determination unit 73 is a functional unit that determines the opening and closing operations of the control valve 55. Specifically, the operation determination unit 73 determines whether to open or close the inlet valve 56. Also, the operation determination unit 73 determines whether to open or close the outlet valve 57. The control unit 74 is a functional unit that controls the opening and closing operations of the control valve 55. Specifically, the control unit 74 controls the energization of the first coil 61 to make the state of the inlet valve 56 the state determined by the operation determination unit 73. Also, the control unit 74 controls the energization of the second coil 62 to make the state of the outlet valve 57 the state determined by the operation determination unit 73.

[0038] That is, the control device 70 of the front-wheel side hydraulic control device 1 controls the opening and closing operations of the inlet valve 56 and the outlet valve 57 of the front-wheel side hydraulic control device 1, thereby controlling the pressure of the brake fluid supplied to the wheel cylinder 253 of the front-wheel side braking unit 251 and controlling the braking force of the front wheel 217. In other words, the front-wheel side hydraulic control device 1 controls the pressure of the brake fluid supplied to the wheel cylinder 253 of the front-wheel side braking unit 251. Also, the control device 70 of the rear-wheel side hydraulic control device 2 controls the opening and closing operations of the inlet valve 56 and the outlet valve 57 of the rear-wheel side hydraulic control device 2, thereby controlling the pressure of the brake fluid supplied to the wheel cylinder 253 of the rear-wheel side braking unit 252 and controlling the braking force of the rear wheel 220. In other words, the rear-wheel side hydraulic control device 2 controls the pressure of the brake fluid supplied to the wheel cylinder 253 of the rear-wheel side braking unit 252.

[0039] For example, the control device 70 of the front-wheel side hydraulic control device 1 operates as follows. When the rider grips the brake lever 241 and the piston 51 of the master cylinder 50 of the front-wheel side hydraulic control device 1 is pressed by the brake lever 241, the braking of the front wheel 217 is started. When the front wheel 217 is being braked, if the control device 70 of the front-wheel side hydraulic control device 1 determines that there is a possibility of locking or locking of the front wheel 217 based on the detection result of the front-wheel side wheel speed sensor 271, the anti-lock brake control is started.

[0040] When the antilock brake control is started, the control device 70 of the front wheel side hydraulic pressure control device 1 energizes the first coil 61, closes the inlet valve 56, and blocks the flow of the brake fluid from the master cylinder 50 to the wheel cylinder 253 of the front wheel side braking unit 251, thereby suppressing the pressure increase of the brake fluid in the wheel cylinder 253 of the front wheel side braking unit 251. On the other hand, the control device 70 of the front wheel side hydraulic pressure control device 1 energizes the second coil 62, opens the outlet valve 57, and allows the flow of the brake fluid from the wheel cylinder 253 of the front wheel side braking unit 251 to the accumulator 58, thereby reducing the pressure of the brake fluid in the wheel cylinder 253 of the front wheel side braking unit 251. As a result, the locking of the front wheel 217 is released or avoided. When the control device 70 of the front wheel side hydraulic pressure control device 1 determines from the detection result of the pressure sensor 59 that the brake fluid in the wheel cylinder 253 of the front wheel side braking unit 251 has been depressurized to a predetermined value, the control device 70 de-energizes the second coil 62 to close the outlet valve 57, and for a short time, de-energizes the first coil 61 to open the inlet valve 56 to increase the pressure of the brake fluid in the wheel cylinder 253 of the front wheel side braking unit 251. The control device 70 of the front wheel side hydraulic pressure control device 1 may increase and decrease the pressure of the wheel cylinder 253 of the front wheel side braking unit 251 only once, or may repeat it a plurality of times.

[0041] Here, as described above, the pressure sensor 59 detects the pressure of the brake fluid that applies pressure to the wheel cylinder 253 among the pressures of the brake fluid present in the internal flow path 40. Therefore, the pressure sensor 59 can directly detect the brake fluid in the wheel cylinder 253 of the front wheel side braking unit 251. Therefore, by the pressure sensor 59 detecting the pressure of the brake fluid that applies pressure to the wheel cylinder 253, the front wheel side hydraulic pressure control device 1 can perform the antilock brake control on the front wheel 217 with high precision.

[0042] When the antilock brake control ends and the brake lever 241 corresponding to the front wheel side hydraulic control device 1 is returned, the inside of the master cylinder 50 of the front wheel side hydraulic control device 1 becomes atmospheric pressure, and the brake fluid in the wheel cylinder 253 of the front wheel side braking unit 251 is returned. Also, when the antilock brake control ends and the brake lever 241 corresponding to the front wheel side hydraulic control device 1 is returned, the front wheel side hydraulic control device 1 opens the outlet valve 57. As a result, when the pressure of the brake fluid in the internal flow path 40 becomes lower than the pressure of the brake fluid stored in the accumulator 58, the brake fluid stored in the accumulator 58 is discharged out of the accumulator 58 without a pump (that is, without pressure increase). Then, the brake fluid discharged out of the accumulator 58 returns to the master cylinder 50 through the fourth flow path 44, the outlet valve 57, the third flow path 43, the second flow path 42, and the first flow path 41. Also, the excess of the brake fluid returned to the master cylinder 50 is stored in the reservoir tank 52.

[0043] Similarly, for example, the control device 70 of the rear wheel side hydraulic control device 2 operates as follows. When the rider grasps the brake lever 241 and the piston 51 of the master cylinder 50 of the rear wheel side hydraulic control device 2 is pressed by the brake lever 241, the braking of the rear wheel 220 is started. When the rear wheel 220 is being braked, if the control device 70 of the rear wheel side hydraulic control device 2 determines that the rear wheel 220 is locked or may be locked based on the detection result of the rear wheel side wheel speed sensor 272, it starts the antilock brake control.

[0044] When the antilock brake control is started, the control device 70 of the rear-wheel hydraulic control device 2 energizes the first coil 61, closes the inlet valve 56, and blocks the flow of the brake fluid from the master cylinder 50 to the wheel cylinder 253 of the rear-wheel braking unit 252, thereby suppressing the pressure increase of the brake fluid in the wheel cylinder 253 of the rear-wheel braking unit 252. On the other hand, the control device 70 of the rear-wheel hydraulic control device 2 energizes the second coil 62, opens the outlet valve 57, and allows the flow of the brake fluid from the wheel cylinder 253 of the rear-wheel braking unit 252 to the accumulator 58, thereby reducing the pressure of the brake fluid in the wheel cylinder 253 of the rear-wheel braking unit 252. As a result, the lock of the rear wheel 220 is released or avoided. When the control device 70 of the rear-wheel hydraulic control device 2 determines from the detection result of the pressure sensor 59 that the brake fluid in the wheel cylinder 253 of the rear-wheel braking unit 252 has been depressurized to a predetermined value, the control device 70 de-energizes the second coil 62 to close the outlet valve 57, and for a short time, de-energizes the first coil 61 to open the inlet valve 56 to increase the pressure of the brake fluid in the wheel cylinder 253 of the rear-wheel braking unit 252. The control device 70 of the rear-wheel hydraulic control device 2 may increase and decrease the pressure of the wheel cylinder 253 of the rear-wheel braking unit 252 only once, or may repeat it a plurality of times.

[0045] Here, as described above, the pressure sensor 59 detects the pressure of the brake fluid that applies pressure to the wheel cylinder 253 among the pressures of the brake fluid existing in the internal flow path 40. Therefore, the pressure sensor 59 can directly detect the brake fluid in the wheel cylinder 253 of the rear-wheel braking unit 252. Therefore, by the pressure sensor 59 detecting the pressure of the brake fluid that applies pressure to the wheel cylinder 253, the rear-wheel hydraulic control device 2 can perform the antilock brake control on the rear wheel 220 with high accuracy.

[0046] When the antilock brake control ends and the brake lever 241 corresponding to the rear-wheel hydraulic control device 2 is returned, the inside of the master cylinder 50 of the rear-wheel hydraulic control device 2 becomes atmospheric pressure, and the brake fluid in the wheel cylinder 253 of the rear-wheel braking unit 252 is returned. Also, when the antilock brake control ends and the brake lever 241 corresponding to the rear-wheel hydraulic control device 2 is returned, the rear-wheel hydraulic control device 2 opens the outlet valve 57. As a result, when the pressure of the brake fluid in the internal flow path 40 becomes lower than the pressure of the brake fluid stored in the accumulator 58, the brake fluid stored in the accumulator 58 is discharged out of the accumulator 58 without a pump. Then, the brake fluid discharged out of the accumulator 58 returns to the master cylinder 50 through the fourth flow path 44, the outlet valve 57, the third flow path 43, the second flow path 42, and the first flow path 41. Also, the surplus of the brake fluid that has returned to the master cylinder 50 is stored in the reservoir tank 52.

[0047] As described above, the front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 store the brake fluid discharged from the wheel cylinder 253 during pressure reduction in the antilock brake control in the accumulator 58, and are configured to discharge the brake fluid in the accumulator 58 out of the accumulator 58 without a pump. The front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 configured in this way can be miniaturized compared to a hydraulic control device that discharges the brake fluid in the accumulator out of the accumulator using a pump, and the degree of freedom in mounting on the bicycle 200 is improved.

[0048] Here, in a conventional hydraulic control device that discharges the brake fluid in the accumulator without a pump to the outside of the accumulator, an internal flow path returns the brake fluid in the accumulator to the master cylinder without passing through the outlet valve. The internal flow path of such a conventional hydraulic control device includes a bypass flow path with one end connected to the accumulator and the other end connected to the flow path between the master cylinder and the inlet valve. Further, the internal flow path of such a conventional hydraulic control device is provided with a check valve in the bypass flow path to prevent the brake fluid from flowing into the accumulator through the bypass flow path, which restricts the brake fluid from flowing from the master cylinder side to the accumulator side. On the other hand, the internal flow path 40 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is configured such that the brake fluid in the accumulator 58 cannot be returned to the master cylinder 50 without passing through the outlet valve 57. That is, the internal flow path 40 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is configured such that the brake fluid in the accumulator 58 cannot be returned to the piston mounting hole 21 (a component of the master cylinder 50) formed in the base body 10 without passing through the outlet valve 57. The internal flow path 40 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 configured in this way does not require the above-mentioned bypass flow path and check valve provided in the conventional hydraulic control device. Therefore, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 configured in this way can be further miniaturized, and the degree of freedom in mounting on the bicycle 200 is further improved.

[0049] Note that in this embodiment, at least a part of the control devices 70 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 is configured as a control board 71. Specifically, in this embodiment, among the control devices 70, the components of the operation determination unit 73 and the control unit 74 are configured as the control board 71. That is, the control board 71 controls the opening and closing operation of the control valve 55. In other words, the control board 71 is electrically connected to the first coil 61 and the second coil 62 and controls the energization to the first coil 61 and the second coil 62.

[0050] Here, in the present embodiment, the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 includes, as a functional unit, a signal output unit 75 that outputs a control signal for the brake lamp 221 based on the detection result of the pressure sensor 59. That is, in the present embodiment, the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 is configured to output a control signal for the brake lamp 221 based on the detection result of the pressure sensor 59.

[0051] Specifically, when the rider grips the brake lever 241 to brake the front wheel 217 and the piston 51 of the master cylinder 50 of the front-wheel-side hydraulic control device 1 is pressed by the brake lever 241, the pressure of the brake fluid in the internal flow path 40 of the front-wheel-side hydraulic control device 1 increases compared to the state where the brake lever 241 is not gripped by the rider. That is, when the rider grips the brake lever 241 and the piston 51 of the master cylinder 50 of the front-wheel-side hydraulic control device 1 is pressed by the brake lever 241, the detected pressure of the pressure sensor 59 of the front-wheel-side hydraulic control device 1 increases compared to the state where the brake lever 241 is not gripped by the rider. At that time, the control device 70 of the front-wheel-side hydraulic control device 1 outputs a control signal for the brake lamp 221. Then, when the bicycle 200 receives the control signal for the brake lamp 221 output from the front-wheel-side hydraulic control device 1, it turns on the brake lamp 221.

[0052] Similarly, when the rider grips the brake lever 241 to brake the rear wheel 220 and the piston 51 of the master cylinder 50 of the rear wheel side hydraulic control device 2 is pressed by the brake lever 241, the pressure of the brake fluid in the internal flow path 40 of the rear wheel side hydraulic control device 2 increases compared to the state where the rider is not gripping the brake lever 241. That is, when the rider grips the brake lever 241 and the piston 51 of the master cylinder 50 of the rear wheel side hydraulic control device 2 is pressed by the brake lever 241, the detected pressure of the pressure sensor 59 of the rear wheel side hydraulic control device 2 increases compared to the state where the rider is not gripping the brake lever 241. At this time, the control device 70 of the rear wheel side hydraulic control device 2 outputs a control signal for the brake lamp 221. Then, when the bicycle 200 receives the control signal for the brake lamp 221 output from the rear wheel side hydraulic control device 2, it turns on the brake lamp 221.

[0053] In a saddle-riding type vehicle equipped with a conventional hydraulic control device in which the piston of the master cylinder is pressed by a brake lever gripped by the rider, a mechanical brake switch for detecting the attitude of the brake lever is provided, and the brake lamp is turned on based on the detection result of the brake switch. Specifically, the brake switch is provided in the vicinity of the brake lever, that is, in the vicinity of the handlebar. And the brake switch is configured to be pushed by the brake lever when the brake lever is gripped by the rider's hand. Also, the brake switch is configured to output a signal when it is being pushed or when it is not being pushed. And in a saddle-riding type vehicle equipped with such a conventional hydraulic control device, it is determined whether or not the brake is being applied based on the presence or absence of the output of the signal from the brake switch, and the brake lamp was turned on.

[0054] Thus, in a straddle-type vehicle equipped with a conventional hydraulic control device as described above, it was necessary to arrange a dedicated brake switch near the handlebar in order to detect whether or not the brake was applied. Further, in a straddle-type vehicle equipped with a conventional hydraulic control device as described above, it was necessary to route a signal line connected to the brake switch near the handlebar. For this reason, the conventional hydraulic control device as described above, that is, the brake system equipped with the hydraulic control device, becomes complicated around the handlebar when mounted on a straddle-type vehicle.

[0055] On the other hand, the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 according to the present embodiment outputs a control signal for the brake lamp 221 of the bicycle 200 based on the detection result of the pressure sensor 59 used for controlling the pressure of the brake fluid supplied to the wheel cylinder 253. For this reason, when mounting the brake system 100 including the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 on the bicycle 200, a dedicated brake switch for detecting whether or not the brake is applied becomes unnecessary. Therefore, when mounting the brake system 100 including the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 on the bicycle 200, the signal line connected to the brake switch also becomes unnecessary. For this reason, the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 according to the present embodiment can suppress the complication around the handlebar 233 more than in the prior art when mounting the brake system 100 on the bicycle 200.

[0056] In addition, a mechanical brake switch is easily broken. Also, when the signal line connected to the brake switch is routed near the handlebar, the rider's hand or the like is likely to catch on the signal line. In view of this point, the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 according to the present embodiment do not require a brake switch and the signal line connected to the brake switch, so the reliability of the bicycle 200 is also improved.

[0057] In addition, as a result of being able to suppress more than before the complication around the handlebar 233, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 according to the present embodiment are easier to attach to the bicycle 200, and the degree of freedom in attaching to the bicycle 200 is improved. Further, the base body 10 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 according to the present embodiment is of an integrated master cylinder type. When the master cylinder 50 and the base body 10 are separate bodies, it is necessary to route piping such as a liquid pipe connecting the master cylinder 50 and the base body 10 in the vicinity of the handlebar 233. On the other hand, when the base body 10 is of an integrated master cylinder type, there is no need to route the piping such as the above-described liquid pipe in the vicinity of the handlebar 233. For this reason, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 according to the present embodiment have a higher degree of freedom in attaching to the bicycle 200 and higher reliability of the bicycle 200 than in the case where the master cylinder 50 and the base body 10 are separate bodies.

[0058] Further, in the present embodiment, when the pressure of the brake fluid in the internal flow path 40 decreases due to the change in the opening / closing state of the control valve 55, the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 outputs a control signal for the brake lamp 221. That is, when the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 reduces the pressure of the brake fluid in the wheel cylinder 253 by anti-lock brake control, it outputs a control signal for the brake lamp 221. The control signal for the brake lamp 221 when the pressure of the brake fluid in the wheel cylinder 253 is reduced by anti-lock brake control is a signal distinguishable from the control signal for the brake lamp 221 when anti-lock brake control is not being performed. Thereby, the bicycle 200 can vary the lighting pattern of the brake lamp 221 depending on, for example, whether anti-lock brake control is being performed during braking. For example, during braking, the bicycle 200 turns on the brake lamp 221 when anti-lock brake control is not being performed, and blinks the brake lamp 221 when anti-lock brake control is being performed. In this way, by varying the lighting pattern of the brake lamp 221 depending on whether anti-lock brake control is being performed during braking of the bicycle 200, for example, a vehicle traveling behind the bicycle 200 can know that the braking force of the bicycle 200 has changed. Therefore, when the pressure of the brake fluid in the internal flow path 40 decreases due to the change in the opening / closing state of the control valve 55, by outputting a control signal for the brake lamp 221, the safety of the bicycle 200 is improved. Note that the control signal for the brake lamp 221 output from the control device 70 of the front-wheel-side hydraulic control device 1 and the rear-wheel-side hydraulic control device 2 may be used for control other than making the brake lamp 221 light up.

[0059] Also, as shown in FIG. 2, in the braking system 100 according to the present embodiment, the brake lever 241 is in contact with the piston 51 of the master cylinder 50 when not being grasped by the rider's hand. Therefore, when the rider starts to grasp the brake lever 241, the piston 51 of the master cylinder 50 is immediately pressed by the brake lever 241. That is, when the rider starts to grasp the brake lever 241, the pressure of the brake fluid in the internal flow path 40 immediately starts to rise. For this reason, in the braking system 100 configured as described above, the delay from when the rider starts braking the bicycle 200 until the brake lamp 221 lights up can be suppressed, and the safety of the bicycle 200 is improved.

[0060] <Configuration of Hydraulic Control Device> The configuration of the hydraulic control device of the braking system according to the embodiment will be described. Note that the braking system 100 according to the present embodiment includes two hydraulic control devices (front wheel side hydraulic control device 1 and rear wheel side hydraulic control device 2). When the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 are attached to the handlebar 233 of the bicycle 200, the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 have shapes that are inverted left and right. For this reason, hereinafter, the front wheel side hydraulic control device 1 will be described. That is, if the front wheel side hydraulic control device 1 described below is inverted left and right, it becomes the rear wheel side hydraulic control device 2. By making the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 have shapes that are inverted left and right, the design of the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 becomes easy. Also, hereinafter, while observing the front wheel side hydraulic control device 1 in a state where the front wheel side hydraulic control device 1 is attached to the handlebar 233 of the bicycle 200 and the bicycle 200 is moving straight ahead, the configuration of the front wheel side hydraulic control device 1 will be described.

[0061] FIG. 6 is a perspective view showing a front-wheel side hydraulic control device according to an embodiment of the present invention. This FIG. 6 is a perspective view of the front-wheel side hydraulic control device 1 observed from the rear right side of the front-wheel side hydraulic control device 1. FIG. 7 is a longitudinal sectional view of the front-wheel side hydraulic control device according to an embodiment of the present invention. FIG. 8 is a bottom view showing the base of the front-wheel side hydraulic control device according to an embodiment of the present invention. Hereinafter, the front-wheel side hydraulic control device 1 will be described with reference to FIGS. 6 to 8 and the above-described figures.

[0062] The base 10 of the front-wheel side hydraulic control device 1 is, for example, a substantially rectangular parallelepiped member made of an aluminum alloy. Note that each surface of the base 10 may be flat, may include a curved portion, or may include a step. In the base 10, a reservoir tank 52, an inlet valve mounting hole 24, an outlet valve mounting hole 26, a wheel cylinder port 45, and a piston mounting hole 21 of the master cylinder 50 are formed.

[0063] The reservoir tank 52 is formed in the base 10 so as to open to the first surface 11. In other words, the opening 53 of the reservoir tank 52 is formed in the first surface 11. The front-wheel side hydraulic control device 1 is attached to the bicycle 200 such that the opening 53 of the reservoir tank 52 is at the upper part of the reservoir tank 52 in order to maintain the inside of the reservoir tank 52 at atmospheric pressure. For this reason, the first surface 11 becomes the upper surface of the base 10. Note that the opening 53 of the reservoir tank 52 is covered with a lid 54.

[0064] The inlet valve mounting hole 24 is a hole in which the inlet valve 56 is provided so as to be reciprocable. The inlet valve mounting hole 24 is formed in the base body 10 so as to open to the second surface 12 which is the opposite surface of the first surface 11. In other words, the opening 25 of the inlet valve mounting hole 24 is formed in the second surface 12. The second surface 12 is the surface that becomes the lower surface of the base body 10. The inlet valve mounting hole 24 is formed in the base body 10, for example, along the vertical direction. In the inlet valve mounting hole 24, the first flow path 41 and the second flow path 42 shown in FIG. 3 among the internal flow paths 40 communicate with each other. Then, when the inlet valve 56 reciprocates in the inlet valve mounting hole 24, the flow of the brake fluid between the first flow path 41 and the second flow path 42 is opened and closed.

[0065] The outlet valve mounting hole 26 is a hole in which the outlet valve 57 is provided so as to be reciprocable. The outlet valve mounting hole 26 is formed in the base body 10 so as to open to the second surface 12. In other words, the opening 27 of the outlet valve mounting hole 26 is formed in the second surface 12. The outlet valve mounting hole 26 is formed in the base body 10, for example, along the vertical direction. In the outlet valve mounting hole 26, the third flow path 43 and the fourth flow path 44 shown in FIG. 3 among the internal flow paths 40 communicate with each other. Then, when the outlet valve 57 reciprocates in the outlet valve mounting hole 26, the flow of the brake fluid between the third flow path 43 and the fourth flow path 44 is opened and closed.

[0066] As described above, the piston 51 of the master cylinder 50 is reciprocally movably provided in the piston mounting hole 21 of the master cylinder 50. The piston mounting hole 21 is formed in the base body 10 so as to open to the third surface 13 that connects the first surface 11 and the second surface 12. In other words, the opening 23 of the piston mounting hole 21 is formed in the third surface 13. The third surface 13 is a surface that becomes the side surface of the base body 10. More specifically, in the case of the front wheel side hydraulic control device 1 provided around the gripping portion 234 on the right side of the handlebar 233, the third surface 13 is the right side surface of the base body 10. Also, in the case of the rear wheel side hydraulic control device 2 provided around the gripping portion 234 on the left side of the handlebar 233, the third surface 13 is the left side surface of the base body 10.

[0067] In a plan view, the master cylinder 50 extends along the range facing the master cylinder 50 in the handlebar 233. In other words, in a plan view, the master cylinder 50 is formed in the base body 10 so as to extend substantially in the left - right direction. The wheel cylinder port 45 is formed in the base body 10 so as to open to the fourth surface 14, which is the opposite surface of the third surface 13.

[0068] In a state where the inlet valve 56 is provided in the inlet valve mounting hole 24, a part of the inlet valve 56 protrudes from the opening 25 of the inlet valve mounting hole 24 to the outside of the inlet valve mounting hole 24. That is, in a state where the inlet valve 56 is provided in the inlet valve mounting hole 24, a part of the inlet valve 56 protrudes downward from the second surface 12 of the base body 10. The first coil 61, which is the drive source of the inlet valve 56, is provided so as to surround the portion of the inlet valve 56 that protrudes downward from the base body 10. Also, the first coil 61 is electrically connected to the control board 71 via the terminal 63.

[0069] In a state where the outlet valve 57 is provided in the outlet valve mounting hole 26, a part of the outlet valve 57 protrudes outside the outlet valve mounting hole 26 from the opening 27 of the outlet valve mounting hole 26. That is, in a state where the outlet valve 57 is provided in the outlet valve mounting hole 26, a part of the outlet valve 57 protrudes downward from the second surface 12 of the base body 10. The second coil 62, which is a drive source of the outlet valve 57, is provided so as to surround a portion of the outlet valve 57 that protrudes downward from the base body 10. Further, the second coil 62 is electrically connected to the control board 71 via the terminal 64.

[0070] The first coil 61, the second coil 62, and the control board 71 are housed in a housing 80 provided in the front wheel side hydraulic control device 1. This housing 80 is connected to the base body 10. The housing 80 that houses the first coil 61, the second coil 62, and the control board 71 disposed below the base body 10 is also disposed below the base body 10.

[0071] In a conventional hydraulic control device having a master cylinder integrated base, an inlet valve mounting hole and an outlet valve mounting hole are formed in the base so as to extend in a substantially horizontal direction when the hydraulic control device is mounted on the handlebar. That is, in a conventional hydraulic control device having a master cylinder integrated base, when the hydraulic control device is mounted on the handlebar, the inlet valve mounting hole and the outlet valve mounting hole are in an open state in the front, rear, or side of the saddle-type vehicle. Here, a housing that houses a coil serving as a drive source for the inlet valve, a coil serving as a drive source for the outlet valve, and a control board that controls energization to these coils is disposed facing the surface of the base where the inlet valve mounting hole and the outlet valve mounting hole open. That is, in a conventional hydraulic control device having a master cylinder integrated base, when mounting the hydraulic control device on the handlebar, a space for disposing the housing must be secured in the front, rear, or side of the hydraulic control device. However, in a saddle-type vehicle, a handlebar is provided behind the mounting position of the hydraulic control device. Also, various things are provided in front of and on the sides of the mounting position of the hydraulic control device in a saddle-type vehicle. For this reason, a conventional hydraulic control device having a master cylinder integrated base has a low degree of freedom in mounting on a saddle-type vehicle.

[0072] On the other hand, in the base 10 of the front-wheel side hydraulic control device 1 according to the present embodiment, the inlet valve mounting hole 24 and the outlet valve mounting hole 26 are formed in the second surface 12 that becomes the lower surface when the front-wheel side hydraulic control device 1 is mounted on the handlebar 233 of the bicycle 200. For this reason, in the front-wheel side hydraulic control device 1 according to the present embodiment, when mounted on the handlebar 233 of the bicycle 200, the first coil 61, the second coil 62, the control board 71, and the housing 80 are disposed below the base 10. Here, in a saddle-type vehicle, there is a spatial margin in the vertical direction around the mounting position of the hydraulic control device compared to the front, rear, and sides. For this reason, the front-wheel side hydraulic control device 1 according to the present embodiment, in other words, the rear-wheel side hydraulic control device 2 according to the present embodiment, has an improved degree of freedom in mounting on the bicycle 200 compared to the conventional one.

[0073] Here, as can be seen from FIG. 8, the arrangement direction of the opening 25 of the inlet valve mounting hole 24 and the opening 27 of the outlet valve mounting hole 26 on the second surface 12 is along the extending direction of the piston mounting hole 21. Specifically, when observing the front wheel side hydraulic control device 1 attached to the handlebar 233 of the bicycle 200 from above or below, the arrangement direction of the opening 25 of the inlet valve mounting hole 24 and the opening 27 of the outlet valve mounting hole 26 on the second surface 12 is along the extending direction of the piston mounting hole 21. Note that the "along" expressed in this embodiment does not indicate that the two directions to be compared are exactly parallel. The two directions to be compared may be slightly inclined. For example, the inclination of the two directions may be less than 45°.

[0074] Generally, a hydraulic control device having a master cylinder integrated base body becomes larger in the extending direction of the piston mounting hole. Also, in a straddle-type vehicle, there is more spatial margin in the left-right direction around the mounting position of the hydraulic control device than in the front-rear direction. That is, in a straddle-type vehicle, there is the least spatial margin in the front-rear direction among the front-rear direction, left-right direction, and up-down direction around the mounting position of the hydraulic control device. For this reason, generally, a hydraulic control device having a master cylinder integrated base body is attached to the handlebar of a straddle-type vehicle such that, in a plan view, the extending direction of the piston mounting hole follows the left-right direction of the straddle-type vehicle. In other words, generally, a hydraulic control device having a master cylinder integrated base body is attached to the handlebar of a straddle-type vehicle such that, in a plan view, the extending direction of the piston mounting hole follows the handlebar. As shown in FIG. 2, the same applies to the front-wheel side hydraulic control device 1 according to the present embodiment. At this time, the front-wheel side hydraulic control device 1 having a configuration in which the arrangement direction of the opening 25 of the inlet valve mounting hole 24 and the opening 27 of the outlet valve mounting hole 26 on the second surface 12 follows the extending direction of the piston mounting hole 21 can suppress the width in the front-rear direction where there is the least spatial margin at the mounting position of the front-wheel side hydraulic control device 1 of the bicycle 200. For this reason, the front-wheel side hydraulic control device 1 having this configuration, in other words, the rear-wheel side hydraulic control device 2 having this configuration has a higher degree of freedom in mounting to the bicycle 200.

[0075] As described above, in the present embodiment, the front wheel side hydraulic control device 1 includes a pressure sensor 59. The pressure sensor 59 is provided in a pressure sensor mounting hole 30 formed in the base body 10. The pressure sensor mounting hole 30 is formed in the base body 10 so as to open to the second surface 12. In other words, the opening 31 of the pressure sensor mounting hole 30 is formed in the second surface 12. The pressure sensor mounting hole 30 is formed in the base body 10, for example, along the vertical direction. By forming the opening 31 of the pressure sensor mounting hole 30 in the second surface 12, the pressure sensor 59 and the control board 71 can be connected in the front-rear direction. Therefore, by forming the opening 31 of the pressure sensor mounting hole 30 in the second surface 12, even when the pressure sensor 59 is provided on the base body 10, an increase in the size of the front wheel side hydraulic control device 1 in the front-rear direction and the left-right direction can be suppressed. Accordingly, the front wheel side hydraulic control device 1 in which the opening 31 of the pressure sensor mounting hole 30 is formed in the second surface 12, or in other words, the rear wheel side hydraulic control device 2 in which the opening 31 of the pressure sensor mounting hole 30 is formed in the second surface 12, has an improved degree of freedom in mounting to the bicycle 200 compared to the prior art even when the pressure sensor 59 is provided on the base body 10.

[0076] Also, as can be seen from FIG. 8, the arrangement direction of the opening 25 of the inlet valve mounting hole 24, the opening 27 of the outlet valve mounting hole 26, and the opening 31 of the pressure sensor mounting hole 30 on the second surface 12 is along the extending direction of the piston mounting hole 21. Specifically, when observing the front wheel side hydraulic control device 1 attached to the handlebar 233 of the bicycle 200 from above or below, the arrangement direction of the opening 25 of the inlet valve mounting hole 24, the opening 27 of the outlet valve mounting hole 26, and the opening 31 of the pressure sensor mounting hole 30 on the second surface 12 is along the extending direction of the piston mounting hole 21. The front wheel side hydraulic control device 1 configured in this way can suppress the width in the front-rear direction with the least spatial margin at the mounting position of the front wheel side hydraulic control device 1 of the bicycle 200 when providing the pressure sensor 59 on the base body 10. Therefore, the front wheel side hydraulic control device 1 configured in this way, or rather the rear wheel side hydraulic control device 2 configured in this way, has a higher degree of freedom in mounting to the bicycle 200 when providing the pressure sensor 59 on the base body 10. Note that the openings 25 of the inlet valve mounting hole 24, the openings 27 of the outlet valve mounting hole 26, and the openings 31 of the pressure sensor mounting hole 30 on the second surface 12 do not necessarily have to be arranged in a straight line, and may be arranged in a zigzag pattern.

[0077] Also, in the present embodiment, the inlet valve mounting hole 24, the outlet valve mounting hole 26, and the pressure sensor mounting hole 30 are arranged in this order, away from the wheel cylinder port 45. As described above, in the present embodiment, the pressure sensor 59 detects the pressure of the brake fluid that applies pressure to the wheel cylinder 253. In such a case, along the flow direction of the brake fluid flowing through the internal flow path 40 from the piston mounting hole 21 of the master cylinder 50 toward the wheel cylinder port 45, the inlet valve mounting hole 24, the outlet valve mounting hole 26, the pressure sensor mounting hole 30, and the wheel cylinder port 45 are arranged. For this reason, the front-wheel-side hydraulic control device 1 configured in this way, in other words, the rear-wheel-side hydraulic control device 2 configured in this way, simplifies the shape of the internal flow path 40 from the inlet valve mounting hole 24 to the wheel cylinder port 45, and the manufacturing cost can be suppressed.

[0078] Also, in the present embodiment, at least a part of the holding portion 95 of the brake lever 241 held by the rider's hand is integrally formed on the base body 10. The configuration of the holding portion 95 is not particularly limited, but in the present embodiment, the holding portion 95 includes a pair of holding plates 96. Holes 97 for rotatably supporting the shaft portion 242 (see FIG. 2) of the brake lever 241 are formed in these holding plates 96. Then, with the shaft portion 242 of the brake lever 241 inserted into the hole 97, the pair of holding plates 96 sandwich the brake lever 241 movably, so that the brake lever 241 is swingably held by the holding portion 95. Also, one of the pair of holding plates 96 is integrally formed with the base body 10 on the fifth surface 15 that is the front surface of the base body 10, for example. Note that the other of the pair of holding plates 96 is fixed to the base body 10 by, for example, screwing. By integrally forming at least a part of the holding portion 95 on the base body 10, compared with the case where the holding portion 95 is formed as a separate body from the base body 10, the number of parts and the assembly man-hours of the brake system 100 can be reduced, and the manufacturing cost of the brake system 100 can be suppressed.

[0079] Further, in the present embodiment, at least a part of the mounting portion 90 for mounting the base body 10 to the handlebar 233 is integrally formed on the base body 10. The configuration of the mounting portion 90 is not particularly limited. In the present embodiment, the mounting portion 90 includes a base portion 91 integrally formed on the base body 10 and a clamping portion 92 fixed to the base portion 91 by screwing or the like. The base portion 91 is integrally formed with the base body 10, for example, on the sixth surface 16 which is the back surface of the base body 10. By clamping the handlebar 233 between the base portion 91 and the clamping portion 92 and fixing the clamping portion 92 to the base portion 91, the base body 10 is fixed to the handlebar 233. By integrally forming at least a part of the mounting portion 90 on the base body 10, compared with the case where the mounting portion 90 is formed as a separate body from the base body 10, the number of parts and the assembly man-hours of the bicycle 200 equipped with the brake system 100 can be reduced, and the manufacturing cost of the bicycle 200 can be suppressed.

[0080] Further, in the present embodiment, an accumulator 58 is formed on the base body 10 of the front wheel side hydraulic control device 1. At this time, the accumulator 58 is disposed on the side opposite to the opening 23 of the piston mounting hole 21 with reference to the bottom 22 of the piston mounting hole 21. In other words, the piston mounting hole 21 of the master cylinder 50 and the accumulator 58 are arranged side by side in the left-right direction in plan view. The front wheel side hydraulic control device 1 in which the accumulator 58 is formed in this way can suppress the width in the front-rear direction where there is the least spatial margin at the mounting position of the front wheel side hydraulic control device 1 of the bicycle 200. Therefore, the front wheel side hydraulic control device 1 in which the accumulator 58 is formed in this way, in other words, the rear wheel side hydraulic control device 2 in which the accumulator 58 is formed in this way, when configured to form the accumulator 58 on the base body 10, the degree of freedom in mounting to the bicycle 200 is improved. In the present embodiment, the opening of the hole opening on the sixth surface 16 is closed to form the accumulator 58. However, the configuration of this accumulator 58 is merely an example. For example, the opening of the hole opening on the fourth surface 14 may be closed to form the accumulator 58. Further, for example, the opening of the hole opening on the fifth surface 15 may be closed to form the accumulator 58.

[0081] <Effect of the Brake System> The effect of the brake system according to the embodiment will be described. The brake system 100 according to the present embodiment is a brake system for a bicycle 200 capable of performing antilock brake control by controlling the pressure of the brake fluid supplied to the wheel cylinder 253. The brake system 100 according to the present embodiment includes a front-wheel-side hydraulic pressure control device 1 and a rear-wheel-side hydraulic pressure control device 2. The front-wheel-side hydraulic pressure control device 1 is attached to the handlebar 233 and controls the pressure of the brake fluid supplied to the wheel cylinder 253 of the front-wheel-side braking unit 251. The rear-wheel-side hydraulic pressure control device 2 is attached to the handlebar 233 and controls the pressure of the brake fluid supplied to the wheel cylinder 253 of the rear-wheel-side braking unit 252. And, in the brake system 100 according to the present embodiment, both the front-wheel-side hydraulic pressure control device 1 and the rear-wheel-side hydraulic pressure control device 2 include a base body 10 and a control valve 55. The base body 10 is formed with a piston mounting hole 21 in which the piston 51 of the master cylinder 50 is reciprocally movable, and an internal flow path 40 that is a part of the flow path of the brake fluid that communicates the piston mounting hole 21 and the wheel cylinder 253. The control valve 55 opens and closes the internal flow path 40 and adjusts the pressure of the brake fluid supplied to the wheel cylinder 253.

[0082] In the brake system 100 according to the present embodiment configured as described above, one of the front-wheel-side hydraulic pressure control device 1 and the rear-wheel-side hydraulic pressure control device 2 is provided around the grip portion 234 of the handlebar 233 that is gripped by the rider's left hand (the left grip portion 234). Further, the other of the front-wheel-side hydraulic pressure control device 1 and the rear-wheel-side hydraulic pressure control device 2 is provided around the grip portion 234 of the handlebar 233 that is gripped by the rider's right hand (the right grip portion 234). For this reason, in the brake system 100 according to the present embodiment configured as described above, when mounted on the bicycle 200, the left-right weight distribution of the attachments to the handlebar 233 becomes more uniform than before, and the steerability of the bicycle 200 is improved compared to before.

[0083] <Modification Example> FIG. 9 is a diagram showing a schematic configuration of a modification example of the brake system according to an embodiment of the present invention. As described above, the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 store the brake fluid discharged from the wheel cylinder 253 during pressure reduction in the antilock brake control in the accumulator 58, and discharge the brake fluid in the accumulator 58 outside the accumulator 58 without a pump. The internal flow paths 40 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 that realize such a configuration are not limited to the above-described configuration. For example, the internal flow paths 40 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 may be configured as shown in FIG. 9.

[0084] Specifically, the internal flow paths 40 of the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 shown in FIG. 9 include a bypass flow path 46 and a check valve 47 in addition to the configuration of the internal flow path 40 shown in FIG. 2. One end of the bypass flow path 46 is connected to the accumulator 58, and the other end is connected to the first flow path 41. The check valve 47 is provided in the bypass flow path 46 and regulates the flow of brake fluid from the master cylinder 50 side to the accumulator 58 side. Also in the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 configured with such an internal flow path 40, the brake fluid discharged from the wheel cylinder 253 during pressure reduction in the antilock brake control is stored in the accumulator 58, and the brake fluid in the accumulator 58 can be discharged outside the accumulator 58 without a pump via the bypass flow path 46.

[0085] FIG. 10 is a block diagram showing a modification example of the brake system according to an embodiment of the present invention. Further, FIG. 11 is a side view showing a schematic configuration of a bicycle equipped with a modification example of the brake system according to an embodiment of the present invention.

[0086] In the front-wheel side hydraulic pressure control device 1 of the brake system 100 shown in FIG. 10, the components of the operation determination unit 73 are configured as an operation determination control board 72 different from the control board 71. For this reason, in the front-wheel side hydraulic pressure control device 1 of the brake system 100 shown in FIG. 10, the components of the control unit 74 are configured as the control board 71. Similarly, also in the rear-wheel side hydraulic pressure control device 2 of the brake system 100 shown in FIG. 10, the components of the operation determination unit 73 are configured as an operation determination control board 72 different from the control board 71. For this reason, in the rear-wheel side hydraulic pressure control device 2 of the brake system 100 shown in FIG. 10, the components of the control unit 74 are configured as the control board 71. And, the operation determination control board 72 of the front-wheel side hydraulic pressure control device 1 and the operation determination control board 72 of the rear-wheel side hydraulic pressure control device 2 have a shared configuration. Further, this operation determination control board 72 is housed at a location different from the housing 80 of the front-wheel side hydraulic pressure control device 1 and the housing 80 of the rear-wheel side hydraulic pressure control device 2. Note that the signal output unit 75 of the front-wheel side hydraulic pressure control device 1 and the rear-wheel side hydraulic pressure control device 2 is also configured as the operation determination control board 72.

[0087] That is, based on information on the traveling state of the bicycle 200, the operation determination control board 72 determines the opening and closing operation of the control valve 55 of the front-wheel side hydraulic pressure control device 1, and determines the opening and closing operation of the control valve 55 of the rear-wheel side hydraulic pressure control device 2. Further, based on the determination by the operation determination control board 72, the control board 71 of the front-wheel side hydraulic pressure control device 1 controls the opening and closing operation of the control valve 55 of the front-wheel side hydraulic pressure control device 1. In other words, based on the determination by the operation determination control board 72, the control board 71 of the front-wheel side hydraulic pressure control device 1 controls the energization to the first coil 61 and the second coil 62 of the front-wheel side hydraulic pressure control device 1. Further, based on the determination by the operation determination control board 72, the control board 71 of the rear-wheel side hydraulic pressure control device 2 controls the opening and closing operation of the control valve 55 of the rear-wheel side hydraulic pressure control device 2. In other words, based on the determination by the operation determination control board 72, the control board 71 of the rear-wheel side hydraulic pressure control device 2 controls the energization to the first coil 61 and the second coil 62 of the rear-wheel side hydraulic pressure control device 2.

[0088] In the brake system 100 configured as described above, the operation determination control board 72 can be housed in a housing different from the housing 80 of the front wheel side hydraulic control device 1 and the housing 80 of the rear wheel side hydraulic control device 2. That is, in the brake system 100 configured as described above, the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 can be made smaller, and the degree of freedom in attaching the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 to the bicycle 200 is further improved. Further, in the brake system 100 configured as described above, the number of signal lines connected to the front wheel side hydraulic control device 1 and the rear wheel side hydraulic control device 2 can be reduced, and it is possible to further suppress the complication around the handlebar 233.

[0089] Here, as shown in FIG. 11, the operation determination control board 72 is preferably attached to a position behind the handlebar 233 in the bicycle 200. Thereby, during the running of the bicycle 200, it is possible to prevent stones or the like from hitting the housing that houses the operation determination control board 72, and the reliability of the brake system 100 is improved.

[0090] Further, as shown in FIG. 10, when another device control board 280, which is a control board of a device other than the brake system 100, is mounted on the bicycle 200, the operation determination control board 72 is preferably integrally formed with the other device control board 280. Here, the bicycle 200 shown in FIG. 11 includes a control board for monitoring the charge amount of the power supply unit 260. For this reason, in the bicycle 200 shown in FIG. 11, the control board for monitoring the charge amount of the power supply unit 260 is used as the other device control board 280. Note that the other device control board 280 is not particularly limited as long as it is a control board of a device other than the brake system 100. For example, among saddle-riding type vehicles equipped with an engine as a drive source, there are those equipped with an engine control unit. For example, the control board of this engine control unit may be used as the other device control board 280.

[0091] By configuring the braking system 100 in this way, the manufacturing cost of the braking system 100 can be reduced compared to the case where the operation determination control board 72 is manufactured as a dedicated control board. Further, when a detection device (for example, a pressure sensor 59 or the like) that detects information used for determining the opening and closing operation of the control valve 55 and the other device control board 280 are connected by signal lines, compared to the case where the operation determination control board 72 is manufactured as a dedicated control board, the number of signal lines routed on the bicycle 200 can be reduced, and the manufacturing man-hours and manufacturing cost of the bicycle 200 can be reduced.

[0092] FIG. 12 is a diagram showing a schematic configuration of a modified example of the braking system according to an embodiment of the present invention. The front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 shown in FIG. 12 are provided with a pump 60 that sends brake fluid to a region between the master cylinder 50 (in other words, the piston mounting hole 21) and the inlet valve 56 in the internal flow path 40. Specifically, the front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 shown in FIG. 12 are provided with a pump 60 in the bypass flow path 46 of the front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 shown in FIG. 9. The front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 configured in this way can discharge the brake fluid stored in the accumulator 58 during decompression in the antilock brake control to the outside of the accumulator 58 through the bypass flow path 46 by operating the pump 60.

[0093] In the front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 configured in this way, among the above-described effects, the effect of downsizing the front-wheel hydraulic control device 1 and the rear-wheel hydraulic control device 2 by discharging the brake fluid in the accumulator 58 to the outside of the accumulator 58 without a pump cannot be obtained, but the other effects can be obtained.

[0094] Further, in a state where the rider is not gripping the brake lever 241, the front-wheel-side hydraulic control device 1 configured as shown in FIG. 12 can increase the pressure of the brake fluid in the wheel cylinder 253 of the front-wheel-side braking unit 251 by opening the inlet valve 56, closing the outlet valve 57, and operating the pump 60, thereby generating a braking force on the front wheel 217. Similarly, in a state where the rider is not gripping the brake lever 241, the rear-wheel-side hydraulic control device 2 configured as shown in FIG. 12 can increase the pressure of the brake fluid in the wheel cylinder 253 of the rear-wheel-side braking unit 252 by opening the inlet valve 56, closing the outlet valve 57, and operating the pump 60, thereby generating a braking force on the rear wheel 220.

[0095] By generating a braking force on at least one of the front wheel 217 and the rear wheel 220 in this way, for example, the bicycle 200 can be provided with an automatic braking function. Also, for example, by generating a braking force on at least one of the front wheel 217 and the rear wheel 220 in this way, the behavior of the bicycle 200 can be stabilized, such as suppressing slip during turning of the bicycle 200.

[0096] Here, when generating braking force on the front wheel 217 in this way, in the front-wheel side hydraulic control device 1, the pressure detected by the pressure sensor 59 increases. Similarly, when generating braking force on the rear wheel 220 in this way, in the rear-wheel side hydraulic control device 2, the pressure detected by the pressure sensor 59 increases. For this reason, when the pressure detected by the pressure sensor 59 increases during the operation of the pump 60, it is preferable for the front-wheel side hydraulic control device 1 and the rear-wheel side hydraulic control device 2 to output a control signal for the brake lamp 221. When generating braking force on the wheels of the bicycle 200 as described above, in the conventional method of lighting the brake lamp based on the detection result of the brake switch, since the rider is not gripping the brake lever 241, the brake lamp 221 cannot be lit. However, when the pressure detected by the pressure sensor 59 increases during the operation of the pump 60, by outputting a control signal for the brake lamp 221, when braking force is generated on the wheels of the bicycle 200 while the rider is not gripping the brake lever 241, the brake lamp 221 can be lit. And thereby, a vehicle traveling behind the bicycle 200 can know that the braking force of the bicycle 200 has changed. Therefore, when the pressure detected by the pressure sensor 59 increases during the operation of the pump 60, by outputting a control signal for the brake lamp 221, the safety of the bicycle 200 is improved.

[0097] As described above, the embodiments have been explained, but the present invention is not limited to the description of the embodiments. For example, only a part of the description of the embodiments may be implemented in the present invention.

Description of Reference Numerals

[0098] 1 Front wheel side hydraulic control device, 2 Rear wheel side hydraulic control device, 10 Base body, 11 First surface, 12 Second surface, 13 Third surface, 14 Fourth surface, 15 Fifth surface, 16 Sixth surface, 21 Piston mounting hole, 22 Bottom, 23 Opening, 24 Inlet valve mounting hole, 25 Opening, 26 Outlet valve mounting hole, 27 Opening, 30 Pressure sensor mounting hole, 31 Opening, 40 Internal flow path, 41 First flow path, 42 Second flow path, 43 Third flow path, 44 Fourth flow path, 45 Wheel cylinder port, 46 Bypass flow path, 47 Check valve, 50 Master cylinder, 51 Piston, 52 Reservoir tank, 53 Opening, 54 Lid, 55 Control valve, 56 Inlet valve, 57 Outlet valve, 58 Accumulator, 59 Pressure sensor, 60 Pump, 61 First coil, 62 Second coil, 63 Terminal, 64 Terminal, 70 Control device, 71 Control board, 72 Operation determination control board, 73 Operation determination unit, 74 Control unit, 75 Signal output unit, 80 Housing, 90 Mounting part, 91 Base part, 92 Clamping part, 95 Holding part, 96 Holding plate, 97 Hole, 100 Brake system, 101 Liquid pipe, 200 Bicycle, 210 Frame, 211 Head tube, 212 Top tube, 213 Down tube, 214 Seat tube, 215 Stay, 216 Front fork, 217 Front wheel, 218 Saddle, 219 Pedal, 220 Rear wheel, 221 Brake lamp, 230 Swivel part, 231 Steering column, 232 Handle stem, 233 Handlebar, 234 Gripping part, 241 Brake lever, 242 Shaft part, 251 Front wheel side braking part, 252 Rear wheel side braking part, 253 Wheel cylinder, 254 Rotor, 260 Power unit, 271 Front wheel side wheel speed sensor, 272 Rear wheel side wheel speed sensor, 280 Other device control board.

Claims

1. A braking system (100) for a straddle-type vehicle (200) capable of performing antilock braking control by controlling the pressure of the brake fluid supplied to a wheel cylinder (253), a front-wheel-side hydraulic pressure control device (1) attached to a handlebar (233) and controlling the pressure of the brake fluid supplied to the wheel cylinder (253) of the front-wheel-side braking unit (251), a rear-wheel-side hydraulic pressure control device (2) attached to the handlebar (233) and controlling the pressure of the brake fluid supplied to the wheel cylinder (253) of the rear-wheel-side braking unit (252), comprising: both the front-wheel-side hydraulic pressure control device (1) and the rear-wheel-side hydraulic pressure control device (2) are a master cylinder integrated base body (10) in which a piston mounting hole (21) in which a piston (51) of a master cylinder (50) is reciprocally movable is formed, and an internal flow path (40) that forms a part of a flow path of the brake fluid that communicates the piston mounting hole (21) and the wheel cylinder (253), a control valve (55) provided on the base body (10), opening and closing the internal flow path (40), and adjusting the pressure of the brake fluid supplied to the wheel cylinder (253), comprising: both the front-wheel-side hydraulic pressure control device (1) and the rear-wheel-side hydraulic pressure control device (2) include a control board (71) that controls the opening and closing operation of the control valve (55), an operation determination control board (72) that determines the opening and closing operation of the control valve (55) of the front-wheel-side hydraulic pressure control device (1) and determines the opening and closing operation of the control valve (55) of the rear-wheel-side hydraulic pressure control device (2) based on information on the running state of the straddle-type vehicle (200), the control board (71) of the front-wheel-side hydraulic pressure control device (1) is configured to control the opening and closing operation of the control valve (55) of the front-wheel-side hydraulic pressure control device (1) based on the determination by the operation determination control board (72), the control board (71) of the rear-wheel-side hydraulic pressure control device (2) is configured to control the opening and closing operation of the control valve (55) of the rear-wheel-side hydraulic pressure control device (2) based on the determination by the operation determination control board (72), braking system (100).

2. The operation determination control board (72) is attached to a position behind the handlebar (233) in the straddle-type vehicle (200). The braking system (100) according to claim 1.

3. The saddle-riding type vehicle (200) is configured to be equipped with an other-device control board (280) which is a control board of a device other than the brake system (100). The operation determination control board (72) is integrally formed with the other-device control board (280). The brake system (100) according to claim 1 or claim 2.

4. Both the front-wheel side hydraulic control device (1) and the rear-wheel side hydraulic control device (2) store the brake fluid discharged from the wheel cylinder (253) during pressure reduction in the antilock brake control in an accumulator (58) formed in the base body (10), and discharge the brake fluid in the accumulator (58) out of the accumulator (58) without a pump. The brake system (100) according to any one of claims 1 to 3.

5. Both the front-wheel side hydraulic control device (1) and the rear-wheel side hydraulic control device (2) include, as the control valve (55), an outlet valve (57) that opens and closes a flow path through which the brake fluid flowing from the wheel cylinder (253) to the accumulator (58) in the internal flow path (40) passes. The internal flow paths (40) of both the front-wheel side hydraulic control device (1) and the rear-wheel side hydraulic control device (2) are configured such that the brake fluid in the accumulator (58) cannot return to the piston mounting hole (21) without passing through the outlet valve (57). The brake system (100) according to claim 4.

6. A saddle-riding type vehicle (200) comprising the brake system (100) according to any one of claims 1 to 5.

7. The saddle-riding type vehicle (200) is a bicycle. The saddle-riding type vehicle (200) according to claim 6.

8. The saddle-riding type vehicle (200) is a motorcycle. The saddle-riding type vehicle (200) according to claim 6. ​

Images