A master cylinder device includes a reservoir tank, a master cylinder, a piston, and a pair of cup seals. The master cylinder includes a cylinder body having a cylinder chamber and a master port. The piston is inserted into the cylinder chamber, and has a relief port that communicates with the master port. The cup seals are provided on an inner circumference of the cylinder chamber, being positioned in front and rear of the master port, and seals a space between the inner circumference of the cylinder chamber and an outer circumference of the piston. The relief port is closed by the front cup seal, as the piston moves forward, to generate brake fluid pressure in a brake fluid in a hydraulic chamber. The relief port is tilted from a front side to a rear side, from the outer circumference toward an inner circumference of the piston.

This invention relates to a hydraulic brake device with a time difference, which utilizes an innovative brake structure to realize the time difference braking technique in which the rear wheel preferentially activates the braking action, to prevent the vehicles from slipping or spillover. Moreover, said time difference hydraulic brake device in the present invention can increase the braking force of the front wheel brake, this allows bicycles, motorcycles, electric scooters, automobiles and other vehicles to effectively improve braking performance and safety.

This invention relates to a hydraulic brake device with a time difference, which utilizes an innovative brake structure to realize the time difference braking technique in which the rear wheel preferentially activates the braking action, to prevent the vehicles from slipping or spillover. Moreover, said time difference hydraulic brake device in the present invention can increase the braking force of the front wheel brake, this allows bicycles, motorcycles, electric scooters, automobiles and other vehicles to effectively improve braking performance and safety.

Disclosed are an electronic brake system and an operating method thereof. The electronic brake system according to the present embodiment comprises: a reservoir having a pressurization medium stored therein; an integrated master cylinder having a master piston, a master chamber of which the volume varies according to the displacement of the master piston, and a sealing member sealing the master chamber; a simulator valve that controls the flow of the pressurization medium between the reservoir and the master chamber; a hydraulic supply device that operates a hydraulic piston on the basis of an electrical signal output in response to a displacement of the brake pedal and generates hydraulic pressure; and a hydraulic control unit provided between the hydraulic supply device and a plurality of wheel cylinders, wherein whether a component element including the integrated master cylinder leaks may be determined on the basis of an inspection flow path connected to the master chamber and an inspection valve provided in the inspection flow path.

A vehicle braking device provided with a hydraulic circuit having a first system, a second system, and a connection flow channel connecting both systems. The vehicle braking device includes a fluid supply unit supplying fluid to the first system, a first braking unit, for applying a braking force to a first wheel by using the fluid flowing in the first system, a second braking unit, for applying a braking force to a second wheel by using the fluid flowing in the second system, a determination unit for determining whether the fluid is leaking from the second system, and a control unit for executing specific control for controlling the fluid supply unit so that an amount of fluid supplied to the first system is increased in response to determination by the determination unit that the fluid is leaking from the second system.

A hydraulic brake assembly (12) includes a housing (24) having first and second side-by-side bores (30), each defining a respective master cylinder assembly. Each master cylinder assembly includes a master cylinder piston (32) slidably movable by actuation of a respective brake pedal (18a, 18b) to and between an active position and an inactive position. A spool (74) slidably disposed within a piston bore (70) of the master cylinder piston (32) is operable in a first mode to direct hydraulic fluid from a quick-fill chamber (62) to a master cylinder chamber (50) at a first pressure upon initial movement of the master cylinder piston (32) from the inactive position toward the active position. The spool (74) is operable in a second mode to direct hydraulic fluid from the quick-fill chamber (62) to a tank (20) when pressure in the master cylinder chamber (50) reaches a predefined threshold.

A hydraulic brake assembly (12) includes a housing (24) having first and second side-by-side bores (30), each defining a respective master cylinder assembly. Each master cylinder assembly includes a master cylinder piston (32) slidably movable by actuation of a respective brake pedal (18a, 18b) to and between an active position and an inactive position. A spool (74) slidably disposed within a piston bore (70) of the master cylinder piston (32) is operable in a first mode to direct hydraulic fluid from a quick-fill chamber (62) to a master cylinder chamber (50) at a first pressure upon initial movement of the master cylinder piston (32) from the inactive position toward the active position. The spool (74) is operable in a second mode to direct hydraulic fluid from the quick-fill chamber (62) to a tank (20) when pressure in the master cylinder chamber (50) reaches a predefined threshold.

A brake apparatus is provided which has applicability to a wide range of vehicles. The brake apparatus includes a master cylinder provided in such a manner that a piston is axially operable in a master cylinder housing, and a stroke simulator including a reaction force piston axially operable by brake fluid introduced into a stroke simulator housing. The master cylinder housing is fixed to the stroke simulator housing. The stroke simulator housing is positioned between the master cylinder housing and a fixation piece structured to fix the stroke simulator housing to the vehicle. The fixation piece is spaced from the master cylinder housing.

A brake apparatus is provided which has applicability to a wide range of vehicles. The brake apparatus includes a master cylinder provided in such a manner that a piston is axially operable in a master cylinder housing, and a stroke simulator including a reaction force piston axially operable by brake fluid introduced into a stroke simulator housing. The master cylinder housing is fixed to the stroke simulator housing. The stroke simulator housing is positioned between the master cylinder housing and a fixation piece structured to fix the stroke simulator housing to the vehicle. The fixation piece is spaced from the master cylinder housing.

A bicycle hydraulic assembly includes a casing, a first piston, and a second piston. The casing has a hydraulic chamber, an inlet channel, and an outlet channel connected to the hydraulic chamber. The first piston is located in the hydraulic chamber. The second piston is sleeved on the first piston. The second piston has a first end portion and a second end portion opposite to each other. The first end portion is wider than the second end portion located farther away from the inlet channel than the first end portion. When the first piston is moved a distance smaller than a threshold distance, the first piston is moved relative to the second piston while the second piston is stationary relative to the casing. When the first piston is moved a distance greater than the threshold distance, the first piston forces the second piston to move relative to the casing.