Abstract: A motorcycle brake system enables a smooth switching to a hydraulic loss simulator to provide an improved feeling of braking operation. A brake operating unit includes a brake caliper, an electromagnetic on-off valve (V1) which blocks a main brake passage, a pressure sensor, a hydraulic modulator, and a hydraulic loss simulator. The brake system allocates a braking force to front and rear wheels by controlling the hydraulic modulator based on a result of detection by the pressure sensor. The brake operating unit has a brake light switch for detecting the starting of operation thereof, actuates an electromagnetic on-off valve (V1) to block the main brake passage based on a result of detection by the brake light switch, and unblocks the main brake passage when a predetermined amount of time elapses without any input made to the pressure sensor in a standby state with the main brake passage blocked.

Abstract: To prevent deterioration of sports driving performance due to the actuation of an ABS in a front-wheel and rear-wheel interlocking brake system of a brake-by-wire system. A brake interlock determining portion starts a front-wheel brake when input hydraulic pressure by a brake operation (pedal operation) on a rear-wheel becomes equal to or greater than an interlocking brake starting pressure value. A threshold selecting switch allows switching of the interlocking brake starting pressure value between when the ABS is active and when the ABS is inactive. When the ABS is active, a lower pressure value is selected as the interlocking brake starting pressure value. When the ABS is inactive, an upper pressure value is selected as the interlocking brake starting pressure value.

Abstract: A braking device for the motorcycle is configured to permit actuation control in an interlocking manner of a rear-wheel brake caliper and a front-wheel brake caliper based on an operation of a brake pedal. The braking device includes a hydraulic pressure detector for detecting rear-wheel brake hydraulic pressure caused by the operation of the brake pedal; a determining portion that determines whether or not a detected value by the hydraulic pressure detector is a predetermined value or more; and a hydraulic pressure controller that, when it is determined by the determining portion that the detected value is the predetermined value or more, changes a rising rate of the rear-wheel brake hydraulic pressure to a value lower than a rising rate during a period until the time when the rear-wheel brake hydraulic pressure reaches the predetermined value to control the rear-wheel brake hydraulic pressure, and also controls front-wheel brake hydraulic pressure.

Abstract: A hydraulic modulator includes a cylinder for slidably supporting a power piston and changing the volume of a hydraulic chamber communicating with brake calipers according to the sliding of the power piston, and an electric motor for sliding the power piston through a power transmitting mechanism. The cylinder extends parallel to a rotating shaft, and a rotational motion of the electric motor is converted into a linear motion on an axis parallel to the rotating shaft. The power transmitting mechanism is provided by a ball screw mechanism composed of a ball screw nut, balls, and a ball screw shaft for converting the rotational motion of the electric motor into the linear motion of the push slider. The push slider has a head portion coming into spherical contact with the power piston. The hydraulic modulator so configured has a small size, and an improved arrangement of components.

Abstract: A motor-driven vehicle capable of increasing the degree of freedom of wiring for a motor. A drive wheel having a motor with a stator and a rotor serving as a drive source disposed in a wheel hub is rotatably supported on a wheel shaft between right and left forks. The stator is provided in a body-side retainer member fixed to a vehicle body, the rotor is rotatably supported on the wheel shaft, and wiring for the motor is passed through the body-side retainer member. The brake mechanism is provided on the drive wheel. As seen from a front of a vehicle body, the wheel hub is rotatably supported on the wheel shaft on one lateral side alone from a body center and the brake mechanism is disposed on one lateral side from a body center and the motor is disposed on the other lateral side from the body center.

Abstract: A brake device 10 for a motorcycle is capable of electrically performing driving so as to control a front wheel brake caliper 16 and a rear wheel brake caliper 18 in response to each operation of a brake lever 12 and a brake pedal 14 and is configured so that the rear wheel brake caliper 18 and the front wheel brake caliper 16 can be combined based on the operation of the brake pedal 14. The brake device 10 performs correction of a target hydraulic pressure acting on the front wheel brake caliper 16 using a prescribed preset function in such a manner as to give a braking force smaller than a braking force corresponding to an additional operation of the brake lever 12 when the brake lever 12 is additionally operated in the state where the brake pedal 14 is operated and the front wheel brake caliper 16 is generating braking force in combination with the rear wheel brake caliper 18.

Abstract: A stroke simulator in a brake system includes a cylinder body, a piston movably inserted in the cylinder body, and a second elastic member adapted to be pressed by the piston. It functions to give a simulative operational feel to a brake lever by operating the brake lever to generate a fluid pressure in a front wheel master cylinder and transmit this fluid pressure to the cylinder body, thereby deforming the second elastic member through the piston, and wherein annular recesses are formed on the outer circumferential surface of the second elastic member.

Abstract: A vehicle-use brake device for miniaturization of a base body and the simplification of brake liquid pressure passages formed in the base body. First electromagnetic open/close valves changing over communication/interruption between master cylinders which output liquid pressures due to the operation of brake operators and wheel brakes, and second electromagnetic open/close valves changing over communication/interruption between a liquid-pressure generation member which are configured to generate liquid pressures due to operations of electrically-operated actuators and the wheel brakes are arranged in the base body. An output port which is connected to a wheel brake is formed in one flat side surface of a base body, first and second electromagnetic open/close valves which arrange operational axes thereof on a first plane orthogonal to one side surface are mounted on one surface of the base body which orthogonally intersects with one side surface from the same direction.

Abstract: To provide a vehicle-use brake device capable of performing a by-wire-method control of high accuracy in response to an inner pressure in a passage by using a pressure sensor possessing high resolution while causing no trouble in view of pressure proof performance. A master cylinder and a brake caliper are connected with each other by a main brake passage and a normally-open solenoid open/close valve V1 is provided to the passage. A reaction simulator is connected to the passage closer to the master cylinder side than the open/close valve V1 by way of a branch passage. A hydraulic modulator is connected to the passage closer to the brake caliper side than the open/close valve V1 by way of a supply/discharge passage. A normally-closed solenoid open/close valve V2 is provided to the branch passage, while a normally-closed solenoid open/close valve V3 is provided to the supply/discharge passage.

Abstract: A braking system includes first pressure sensors 35, 35 which are provided to braking pipes 41, 41 which constitute first input-side pressure sensors for detecting a liquid pressure on a front-wheel-master-cylinder-25 side and a rear-wheel-master-cylinder-82 side, and second pressure sensors 36, 36 which are provided at positions closer to a stroke-simulator-28 side than second solenoid-operated valves 31, 31 of braking pipes 27,27 which constitute second input-side pressure sensors for detecting a liquid pressure on the stroke-simulator-28 side.

Abstract: A wheel braking controller of a vehicle includes a brake lever operated by a rider, a master cylinder generating a hydraulic pressure according to an operation force of the brake lever, and a brake caliper braking a front wheel based on operation of the brake lever, a channel switching unit provided between the master cylinder and the brake caliper and switching channels of a brake fluid. A hydraulic pressure generator generates a hydraulic pressure based on operation of the brake lever and the driving state of the vehicle and controlling braking of the front wheel using the brake caliper by the hydraulic pressure. A braking controller including the channel switching unit and the hydraulic pressure generator is integrally provided on one body. The wheel braking controller so configured reduces the number of parts, and provides for easy mounting of the controller on the vehicle body.

Abstract: An electronic braking device is provided which easily generates a braking force depending on the amount of brake operation in a range in which the amount of brake operation is small, just after the start of brake operation, and which protects a fluid pressure sensor from a fluid pressure beyond its tolerance. The electronic braking device activates a brake caliper through an electronic control unit (ECU) according to a signal in response to a braking request from a driver, and is provided with a first pressure sensor and a second pressure sensor for detecting the requested braking amount. The first pressure sensor and the second pressure sensor are different from each other in detection resolution and detection range. A relief valve unit r is provided which, when a fluid pressure above a prescribed level is applied to the master cylinder 3, relieves this fluid pressure.

Abstract: To provide a vehicle-use brake device capable of performing a by-wire-method control of high accuracy in response to an inner pressure in a passage by using a pressure sensor possessing high resolution while causing no trouble in view of pressure proof performance. A master cylinder and a brake caliper are connected with each other by a main brake passage and a normally-open solenoid open/close valve V1 is provided to the passage. A reaction simulator is connected to the passage closer to the master cylinder side than the open/close valve V1 by way of a branch passage. A hydraulic modulator is connected to the passage closer to the brake caliper side than the open/close valve V1 by way of a supply/discharge passage. A normally-closed solenoid open/close valve V2 is provided to the branch passage, while a normally-closed solenoid open/close valve V3 is provided to the supply/discharge passage.

Abstract: A hydraulic modulator includes a cylinder for slidably supporting a power piston and changing the volume of a hydraulic chamber communicating with brake calipers according to the sliding of the power piston, and an electric motor for sliding the power piston through a power transmitting mechanism. The cylinder extends parallel to a rotating shaft, and a rotational motion of the electric motor is converted into a linear motion on an axis parallel to the rotating shaft. The power transmitting mechanism is provided by a ball screw mechanism composed of a ball screw nut, balls, and a ball screw shaft for converting the rotational motion of the electric motor into the linear motion of the push slider. The push slider has a head portion coming into spherical contact with the power piston. The hydraulic modulator so configured has a small size, and an improved arrangement of components.

Abstract: A motorcycle brake system enables a smooth switching to a hydraulic loss simulator to provide an improved feeling of braking operation. A brake operating unit includes a brake caliper, an electromagnetic on-off valve (V1) which blocks a main brake passage, a pressure sensor, a hydraulic modulator, and a hydraulic loss simulator. The brake system allocates a braking force to front and rear wheels by controlling the hydraulic modulator based on a result of detection by the pressure sensor. The brake operating unit has a brake light switch for detecting the starting of operation thereof, actuates an electromagnetic on-off valve (V1) to block the main brake passage based on a result of detection by the brake light switch, and unblocks the main brake passage when a predetermined amount of time elapses without any input made to the pressure sensor in a standby state with the main brake passage blocked.

Abstract: A brake system includes a front and a rear wheel brake circuit which are independent of each other. Each circuit includes: a master cylinder connected to a brake caliper through the main brake line; a hydraulic pressure modulator which causes an electrically-operated motor to generate hydraulic pressure; and a normally-open electromagnetic on-off valve. When the two brake circuits are moved in response to operation of a braking operation unit in one circuit, in the brake circuit for which a braking operation unit was operated earlier, the electromagnetic on-off valve opens so that the brake caliper is operated by use of hydraulic pressure from the master cylinder. In the other brake circuit, the electromagnetic on-off valve is closed so that the brake caliper is operated by use of hydraulic pressure from the hydraulic pressure modulator. The braking system uses simple wheel braking mechanism and piping, and concurrently reduces electric current consumption.

Abstract: A combined braking system in which communicative connection a master cylinder and a brake caliper is cut off by an electromagnetic on-off valve, and hydraulic pressure, corresponding to driving conditions and a braking operation, is generated by an electrically-operated actuator of a hydraulic pressure modulator. Hydraulic pressure of the hydraulic pressure modulator operates on the brake caliper, whereas a psuedo-reaction force which has been generated by a reaction force modulator operates on the master cylinder. The reaction force modulator is configured to include: a fluid chamber for receiving hydraulic fluid which has flowed therein from the master cylinder; a piston to constitute a wall of the fluid chamber; and a metal-made coil spring and a deformed plastic resin spring, both of which apply a force to the piston. The braking system provides a braking operation having a smooth feeling which is similar to that given by a direct-operation-type brake system.

Abstract: An electronic braking device is provided which easily generates a braking force depending on the amount of brake operation in a range in which the amount of brake operation is small, just after the start of brake operation, and which protects a fluid pressure sensor from a fluid pressure beyond its tolerance. The electronic braking device activates a brake caliper through an electronic control unit (ECU) according to a signal in response to a braking request from a driver, and is provided with a first pressure sensor and a second pressure sensor for detecting the requested braking amount. The first pressure sensor and the second pressure sensor are different from each other in detection resolution and detection range. A relief valve unit r is provided which, when a fluid pressure above a prescribed level is applied to the master cylinder 3, relieves this fluid pressure.

Abstract: A combined braking system in which communicative connection a master cylinder and a brake caliper is cut off by an electromagnetic on-off valve, and hydraulic pressure, corresponding to driving conditions and a braking operation, is generated by an electrically-operated actuator of a hydraulic pressure modulator. Hydraulic pressure of the hydraulic pressure modulator operates on the brake caliper, whereas a psuedo-reaction force which has been generated by a reaction force modulator operates on the master cylinder. The reaction force modulator is configured to include: a fluid chamber for receiving hydraulic fluid which has flowed therein from the master cylinder; a piston to constitute a wall of the fluid chamber; and a metal-made coil spring and a deformed plastic resin spring, both of which apply a force to the piston. The braking system provides a braking operation having a smooth feeling which is similar to that given by a direct-operation-type brake system.

Abstract: A brake system includes a front and a rear wheel brake circuit which are independent of each other. Each circuit includes: a master cylinder connected to a brake caliper through the main brake line; a hydraulic pressure modulator which causes an electrically-operated motor to generate hydraulic pressure; and a normally-open electromagnetic on-off valve. When the two brake circuits are moved in response to operation of a braking operation unit in one circuit, in the brake circuit for which a braking operation unit was operated earlier, the electromagnetic on-off valve opens so that the brake caliper is operated by use of hydraulic pressure from the master cylinder. In the other brake circuit, the electromagnetic on-off valve is closed so that the brake caliper is operated by use of hydraulic pressure from the hydraulic pressure modulator. The braking system uses simple wheel braking mechanism and piping, and concurrently reduces electric current consumption.