Toyota Jidosha Kogyo Kabushiki Kaisha

Ishizuka Glass Co., Ltd.

Hiromu Konishi

Masahiko Sugiyama

Kiyoshi Uchida

Mitsuyuki Horie

Kiyoshi Nishiwaki

Tadahide Toda

Haruhiko Nakayama

A disc brake having a pair of pistons composed of a Devitroceramics having a heat conductivity of about 1.times.10.sup.-3 cal/cm.sec..degree.C. to about 4.times.10.sup.-2 cal/cm.sec..degree.C., a bend strength of about 5 kg/mm.sup.2 to about 55 kg/mm.sup.2, a Vickers' hardness of about 400, and a density of smaller than about 4.0 g/cm.sup.3. A method of manufacturing the disc brake comprises incorporating into the disc brake a pair of pistons which are prepared by mixing the component materials of the Devitroceramics, melting them to a homogeneous molten state, molding the molten materials into a piston-shaped article, annealing the article for crystallization and heating the article.

Disc brake and method of manufacturing the same

An inertia-controlled valve unit includes a valve seat provided within a valve chamber and a ball disposed within the valve chamber to co-operate with the valve seat and rolling toward the valve seat to cut-off excessive braking pressure applied to rear wheel brake cylinders. The inertia-controlled valve unit comprises a solenoid winding attached to the valve housing, a plunger passing through the solenoid winding into the valve chamber and located behind the ball, the plunger being moved forwardly by energization of the solenoid winding to engage the ball against the valve seat, a normally open switch attached to a portion of a push-rod for connecting the solenoid winding to a source of electricity when closed, and a movable element slidable on the push-rod to be displaced toward the switch by inertia force acting thereon when the brake pedal is rapidly depressed, the movable element closing the switch when engaged with the switch.

Braking pressure control valve unit

A device for operating a parking brake including a pivotable lever for stretching a brake cable and a one-way locking mechanism for the lever having a pawl and ratchet teeth. The pawl is actuated by the balance of a spring force and the reaction force of the cable stretched so that the pawl is driven into engagement with the ratchet teeth by the reaction of the cable against the spring force when the cable is stretched beyond a predetermined tensioned condition.

Device for operating a parking brake

A negative pressure generating system for an internal combustion engine powered vehicle, comprising a brake booster incorporated in the vehicle and adapted for an increase in braking power, an air cleaner for cleaning air to be supplied to the internal combustion engine, an air pump which receives air from said air cleaner and delivers the air to said internal combustion engine, and a valve disposed among said brake booster, said air cleaner and said air pump and operative in response to the booster pressure in said brake booster on receiving said pressure as an input signal, thereby interrupting air communication between said air pump and said air cleaner, with the result that the negative pressure arising on the suction side of said air pump is used as a negative pressure source for operating said brake booster.

Growing community of inventors

Toyota, Japan

Hiromu Konishi