An anti-lock braking unit is provided which has a single actuating solenoid acting on a piston of an associated valve unit. The actuating solenoid moves the piston within a primary hydraulic chamber in fluid communication with a brake calliper. A movement of the piston closes a bypass passage formed within the valve unit, that connects a master cylinder to the brake calliper. By closing the bypass passage, the build-up of pressure acting on the calliper is stopped. Simultaneously, the movement of the piston opens an outflow passage within the valve unit, allowing a brake fluid to vent from the primary hydraulic chamber into an expansion chamber. The expansion chamber provides an increased volume for brake fluid contained between the valve unit and the brake calliper, thereby decreasing pressure of the brake fluid acting on the calliper.

A hydraulic brake distributor for a two-wheeled vehicle has an outer body that forms an internal cavity accommodating two floating piston valve elements. The two floating piston valve elements are axially movable and mutually coupled in a telescopic manner. One of the two floating piston valve elements has an internal through-channel.

To obtain a hydraulic pressure control unit and a straddle-type vehicle brake system, each of which can answer a request for downsizing. The straddle-type vehicle brake system has a hydraulic circuit that includes: a primary channel through which brake fluid in a master cylinder is delivered to a wheel cylinder; a secondary channel through which the brake fluid in the wheel cylinder is released to a primary channel intermediate portion; and a supply channel that supplies the brake fluid to a secondary channel intermediate portion. In a state where a surface on which a motor 28 of a base body 51 in the hydraulic pressure control unit is vertically provided is seen from the front, an opening for a first valve 31 that controls a flow rate on the wheel cylinder side of the primary channel intermediate portion and an opening for a second valve 32 that controls a flow rate on an upstream side of the secondary channel intermediate portion overlap a first straight line L1, and an opening for a third valve 35 that controls a flow rate on the master cylinder side of the primary channel intermediate portion and an opening for a fourth valve 36 that controls a flow rate of the supply channel overlap a second straight line L2 that crosses the first straight line L1 at a right angle.

In a brake device for a saddle-type vehicle, including hydraulic front and rear wheel brakes and a first control unit that controls operations of the front wheel brake and the rear wheel brake, a second control unit includes a collision possibility determining section that determines a possibility of collision of an own vehicle with an obstacle ahead, the first control unit has an automatic brake controller that performs automatic brake control to automatically increase braking forces of the front wheel brake and the rear wheel brake, and in case where the collision possibility determining section determines that there is the possibility of collision, the automatic brake controller pressurizes the rear wheel brake to brake a rear wheel, and simultaneously pressurizes the front wheel brake up to a predetermined pressure at which a vehicle body posture is not changed by braking of a front wheel.

A hydraulic pressure control unit capable of suppressing application of an external force thereto in comparison with the related art at the time when mounted to a straddle-type vehicle is obtained.

A hydraulic pressure control unit (1) includes a base body (10) that is formed with a master cylinder port (11), a wheel cylinder port (12), and an internal channel (13) communicating the master cylinder port (11) and the wheel cylinder port (12) with each other. The master cylinder port (11) is formed in an upper surface (25) of the base body (10), and the wheel cylinder port (12) is formed in a lower surface (26) of the base body (10), the lower surface (26) opposing the upper surface (25). The internal channel (13) is configured not to be able to return a brake fluid in an accumulator (33) to the master cylinder port (11) without interposing an outlet valve (32). An inlet valve recess (18) and an outlet valve recess (19) are aligned in a direction in which the upper surface (25) and the lower surface (26) are aligned.

The present invention obtains a controller and a control method capable of improving a rider's perceptibility of a warning.

A controller (51) for a rider-assistance system (50) mounted to a straddle-type vehicle (100) includes: a determination section that determines necessity of the warning given to the rider; a haptic motion performing section that performs haptic motion at least once to reduce or increase acceleration/deceleration of the straddle-type vehicle (100) only for a moment; and an acquisition section that acquires travel state information of the straddle-type vehicle (100). The haptic motion performing section changes a priority of each wheel (3, 4) at the time of changing a braking force to reduce or increase the acceleration/deceleration only for the moment in the haptic motion according to the travel state information acquired by the acquisition section.

A position of a center of gravity of a vehicle body is easily optimized. An ABS modulator is disposed in a vicinity of a pivot bracket, which is joined to a lower rear portion of a main frame, and to which a swing arm is swingably connected.

To achieve a brake hydraulic pressure control system for a straddle-type vehicle which makes it possible to reduce its size as compared to existing ones.

A brake hydraulic pressure control system (70) according to the present invention including: a substrate (80); a motor (40) which is a brushless motor configured to drive a pump device (31); a housing (85) which is connected to the substrate (80); and a detection mechanism (60) which is configured to detect the rotation state of an output shaft (45) of the motor (40), in which the motor (40) is disposed in a space surrounded by the substrate (80) and the housing (85), and a bearing (46) of the motor (40) is inserted into a concave part (84) formed in the substrate (80).

To achieve a brake hydraulic pressure control system for a vehicle which makes it possible to reduce its size as compared to existing ones.

A motor (40) of a brake hydraulic pressure control system (70) according to the present invention is a brushless motor, and is disposed in a space surrounded by a substrate (80) and a housing (85). A stator (41) of the motor (40) includes a coil (42) and a mold part (43) covering the coil (42) with a mold member. The mold part (43) is in contact with a motor housing (50) of the motor (40). The brake hydraulic pressure control system has such a configuration that heat generated by the coil (42) is transmitted to an object, which is in contact with the motor housing (50), by way of the mold part (43) and the motor housing (50).

To achieve a brake hydraulic pressure control system which makes it possible to suppress an increase of the manufacturing cost as compared to existing brake hydraulic pressure control systems which ground a control board using a coil spring. A brake hydraulic pressure control system according to the present invention includes: a metallic substrate (80) in which a flow channel for brake fluid is formed; and a control board (76) of a hydraulic pressure control mechanism for the brake fluid provided in the flow channel. The brake hydraulic pressure control system according to the present invention further includes at least one conductive plate spring (90) which is provided between the control board (76) and a component that is electrically connected to the substrate (80). The free length of the plate spring (90) is longer than the distance between the control board (76) and the component, and the plate spring (90) has a first end part (93) connected to the control board (76) and a second end part (94) connected to the component.