Aisin Seiki Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Asao Kozakai

Noriakira Ishigami

Nobuyasu Nakanishi

Masakazu Ishikawa

Shingo Watanabe

Takaaki Ota

Yoshiharu Adachi

Wataru Tanaka

Hiroyuki Oka

Yoshikazu Tachiiri

Fumio Nakagawa

Katsumi Otsuka

An electrical vehicle parking brake device capable of reducing the size towards a cable shaft and improving the degree of freedom of mounting in a vehicle is provided for the electrical vehicle parking brake device of controlling the braking force to a wheel due to the driving power of a motor which is transmitted by way of a cable at the time of parking the vehicle. At the time of parking the vehicle, in the electrical vehicle parking brake device of controlling the braking force to the wheel due to the driving power of a motor which is transmitted by way of a gear mechanism and a cable at the time of parking the vehicle, an end gear series of the gear mechanism is structured of an external gear and an internal gear, the external gear uses a K-H-V type planetary gear mechanism in which external gear turns to the extent of a difference between the numbers of teeth between the external gear and the internal gear by making one revolution in an inner circumference side of the internal gear and also the cable is wound up in a circular shape in the external gear.

Electrical vehicle parking brake device

The present invention is directed to a braking force control system capable of generating a first braking force and a second braking force that is a supplement to the first braking force. The first braking force is generated in response to the operation of the brake pedal. The second braking force is generated when the operation speed of the brake pedal is more than the threshold value. The operation stroke sensor detects the operation stroke of the brake pedal as the operation stroke data. The timer detects the operation time of the brake pedal as the operation time data. The operation speed of the brake pedal is calculated on the basis of the operation stroke data and the operation time data in the electric controller. The RAM of the electric controller memorizes operation stroke data and operation speed data from a plurality of operations. The threshold value is calculated on the basis of the plural operation stroke data and the plural operation speed data. In the electric controller the threshold value is then compared with the operation speed of the brake pedal.

Braking force control system for an automotive vehicle

A traction control device includes a vacuum booster connected to a master cylinder. The master cylinder is in fluid communication with a driven wheel brake and a non-driven wheel brake via respective first and second solenoid valves. When the brake traction control initiation condition is established, the booster is activated to supply fluid pressure from the master cylinder to the driven wheel brake and the non-driven wheel brake. After elapse of a time from the activation of the booster, the second solenoid valve is closed to prevent a further increase of the brake fluid pressure in the non-driven wheel brake. Thereafter, the brake fluid pressure in the driven wheel brake is adjusted by controlling the first solenoid valve as well as by controlling a fluid pressure pump which is associated with the fluid communication between the master cylinder and the driven wheel brake.

Traction control device for vehicle

A regulator valve for a hydraulic anti-skid apparatus and which includes a housing provided with a first inlet port for connection to a fluid pump and the anti-skid apparatus, a second inlet port for connection to a master cylinder, and an outlet port for connection to a fluid reservoir, a regulator piston reciprocably disposed within the housing to form a first fluid chamber in open communication with the first inlet and outlet ports and a second fluid chamber in open communication with the second inlet port, and a spring loaded annular valve seat member arranged within the first fluid chamber to cooperate with a valve part of the piston so as to control the fluid flow from the first inlet port to the outlet port in response to the difference in pressure between the fluid chambers. A support member is arranged within the first fluid chamber formed therein with an axial bore in which a large diameter portion of the piston is slidably disposed to form a third annular fluid chamber. The support member is further formed with an orifice for effecting the fluid flow between the first and third fluid chambers in response to axial movement of the piston.

Regulator valve for hydraulic anti-skid apparatus

A regulator valve for a hydraulic anti-skid apparatus, in which a first valve member in the form of a piston is reciprocable within a housing for the regulator valve and subdivides the interior of the housing into first and second chambers arranged to be respectively applied with a hydraulic power pressure from a fluid pump and a master cylinder pressure from a master cylinder, the first valve member being formed at its one end with a valve part exposed within the first chamber, and in which a second annular valve member is arranged in the first chamber coaxially with the first valve member and is formed at its one end with a first small diameter valve part cooperating with the valve part of the first valve member to form a first annular throttle for throttling the fluid flow from the pump to a fluid reservoir through the first chamber and at its other end with a second large diameter valve part cooperating with the inner end wall of the first chamber to form a second annular throttle for throttling the fluid flow after the first annular throttle is closed, the second valve member being resiliently loaded by a spring toward the inner end wall of the first chamber.

A fault alarm device for a vehicle dual brake system including front and rear master cylinders, front and rear wheel cylinders and a proportioning valve which functions to develop proportioned rear wheel braking fluid pressure at a reduced rate relative to the rear wheel braking fluid pressure from the rear master cylinder. The fault alarm device comprises a fault alarm circuit for indicating the fault in the dual brake system when energized, and a control valve interposed between the master cylinders and the wheel cylinders and associated with the proportioning valve. The control valve includes a body, a stepped cylinder formed in the body, a stepped piston slidably inserted in the stepped cylinder, and a sleeve slidably interposed between the stepped cylinder and piston. The alarm device further comprises a switch engaged with the stepped piston for energizing the alarm circuit in response to the sliding movement of the stepped piston from its neutral position. Thus, the stepped piston can be urged to slide from the neutral position under the force of the front wheel braking fluid pressure to insure indication of the fault in the dual brake system, even if the proportioned rear wheel braking fluid pressure between the proportioning valve and the rear wheel cylinders does not arise as a result of increase in the rear wheel braking fluid pressure from the rear master cylinder due to fault in the proportioning valve.

Braking fluid pressure fault alarm device

An improved brake pressure proportioning unit of the kind responsive to centrifugal force developed by a turning vehicle and having two separate weight-activated levers controlling the springs that determine the pressure reduction setpoints of two proportioning valves, utilizes a link to connect the separate levers outside the pressure boundaries for automatically equalizing the exerting forces of the springs and permitting manual adjustment of the biasing of the springs a like amount. Also, an improved brake pressure proportioning unit of the abovementioned kind uses a single weight and lever mechanism for equalizing the absolute magnitude of changes in the working length of both springs during a turn, the change in one spring being an increase and the change in the other being a decrease in working length.

Hydraulic brake pressure control device

An electric switch for use in a braking fluid pressure fault alarm device for a vehicular dual brake system, which device includes a body having a cylinder, a piston slidably inserted in the cylinder and receiving front and rear wheel braking fluid pressures for sliding movement from its inoperative position to its operative position in response to leakage of either of the braking fluid pressures, and an electric alarm circuit for generating an alarm signal when deenergized. The electric switch is engaged with the piston and is switched from its conductive condition to its non-conductive condition in response to sliding movement of the piston in order to deenergize the electric alarm circuit. This electric switch comprises a switch body having a stepped through bore, an annular support fixedly mounted in the switch body, an insulating terminal holder fixedly mounted in the switch body, a conductive plate disposed in the terminal holder, a terminal fixedly mounted in the terminal holder, a weak spring disposed in the terminal holder for biasing the plate into abutting engagement with the support, a plunger inserted in the switch body, and a spring interposed between the plunger and the support and compressed to be loaded at a preset level so as to bias the plunger apart from the plate. Thus, the plunger can be moved, in response to the sliding movement of the piston, from the inoperative position toward the plate to bring its insulating end portion into abutment engagement with the plate to thereby separate the plate from the support.

Electrical switch for a braking fluid pressure fault alarm device

Apparatus for providing an indication to a vehicle operator of failure of either of separated fluid braking circuits by means of an electric circuit, which electric circuit is further enabled to provide such indication in response to self-deactuation of the electric circuit.

Growing community of inventors

Anjo, Japan

Asao Kozakai