Brake valve



PROBLEM TO BE SOLVED: To widen the degree of freedom by eliminating the restriction imposed on the strength when a piston is made of a material of synthetic resin. SOLUTION: A brake valve concerned is composed of a cylindrical guide member 6 fitted on the upper part of a valve housing 2, a plunger 7 installed at the guide member slidably, a piston 10 having an exhaust air shutoff valve element 16, and a supply/exhaust valve element 17 which shuts off the output port 12b from the exhaust passage in the operating condition and puts the supply port 12a in communication with the output port 12b. Through the plunger 7 the operating force of a brake pedal 3 is transmitted to the piston 10 so that it works. A projection 36 is provided at the periphery of the upper part of the plunger 7, and in the upper part of the guide member 6, a stopper 6a is furnished which is positioned as mating with the projection for setting the lower limit position in sliding of the plunger, and thereby the lower limit position of the piston strokes is defined. COPYRIGHT: (C)1997,JPO
(57)【要約】 【課題】 ピストンを合成樹脂化するに際し、強度上の 制約をなくして、設計上の自由度を向上させる。 【解決手段】 バルブハウジング2の上部に嵌着した筒 状のガイド部材6と、該ガイド部材に摺動自在に嵌合装 着したプランジャ7と、排気遮断弁体16を有するピス トン10と、作動状態で出力口12bと排気通路17c との間を遮断するとともに供給口12aと出力口12b とを連通させる供給排出弁体17とを備え、プランジャ 7を介してブレーキペダル3の操作力をピストン10に 伝達して作動させ、プランジャ7の上部外周に突出部3 6を設け、ガイド部材6の上部には該突出部に対応する 位置にあってプランジャ7の摺動下限位置を設定するた めのストッパ6aを設け、プランジャ7の摺動下限位置 の設定によってピストン10のストロークの下限位置を 設定してある。




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