JPS6364567U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例を示す断面図、第２
図は第１図の―線に沿う断面図、第３図は第
１図の要部を示し、第４図の―線に沿う断面
図、第４図は第３図の右側面図である。 ６……バルブボデイ、６ａ……フランジ部、６
ｂ……第１係合凹部、６ｃ……第１係合凸部、６
ｄ……段部端面、９ｂ……後方側壁、９……フロ
ントパワーピストン、９ｄ……前方側壁、９ｅ…
…環状凹部、９ｆ……第２係合凸部、９ｇ……第
２係合凸部、９ｈ……係合爪、１１……フロント
ダイアフラム、１１ａ……内周部。 Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view taken along the line - in Fig. 1, Fig. 3 shows the main part of Fig. 1, a sectional view taken along the - line in Fig. 4, and Fig. 4 is a right side view of Fig. 3. . 6...Valve body, 6a...Flange part, 6
b...First engagement recess, 6c...First engagement convexity, 6
d... Step end surface, 9b... Rear side wall, 9... Front power piston, 9d... Front side wall, 9e...
...Annular recess, 9f...Second engagement protrusion, 9g...Second engagement protrusion, 9h...Engagement pawl, 11...Front diaphragm, 11a...Inner peripheral part.

Claims (1)

【実用新案登録請求の範囲】 バルブボデイに第１係合凸部と第１係合凹部と
を円周方向に設け、またパワーピストンに第２係
合凸部と第２係合凹部とを円周方向に設け、それ
らバルブボデイとパワーピストンを所要回転角度
に位置させるとともに、両者を軸方向に移動させ
て上記第１係合凸部を第２係合凹部に、第２係合
凸部を第１係合凹部にそれぞれ通過させ、かつ両
者を相対回転させて上記第１係合凸部と第２係合
凸部とを相互に係合させて上記バルブボデイとパ
ワーピストンとを連結させ、さらに上記パワーピ
ストンの背面にダイアフラムを張設したブレーキ
倍力装置のパワーピストン組立体において、 上記バルブボデイの外周にフランジ部を形成し
てこのフランジ部に上記第１係合凸部と第１係合
凹部とを形成するとともに、上記パワーピストン
の内周部に上記フランジ部を収容可能な環状凹部
を形成してこの環状凹部を形成する前方側壁に上
記第２係合凸部と第２係合凹部とを形成し、また
上記ダイアフラムの内周部を、上記パワーピスト
ンの背面から上記環状凹部の後方側壁の内周部を
越えて上記環状凹部内に収容させるとともに、そ
のダイアフラムの内周部を上記後方側壁とフラン
ジ部の後方端面との間に介在させてパワーピスト
ンとバルブボデイとの間の気密を保持させ、さら
に上記後方側壁に上記ダイアフラムを貫通して半
径方向内方に突出する係合爪を形成してその係合
爪を上記ダイアフラムの内周部よりも半径方向内
方位置で上記バルブボデイに形成した段部端面に
当接させ、上記パワーピストンに加わる推力をそ
の係合爪を介してバルブボデイに伝達させること
を特徴とするブレーキ倍力装置のパワーピストン
組立体。[Claims for Utility Model Registration] A first engaging protrusion and a first engaging recess are provided on the valve body in the circumferential direction, and a second engaging protrusion and a second engaging recess are provided on the power piston in the circumferential direction. position the valve body and power piston at a required rotation angle, and move them both in the axial direction so that the first engagement protrusion becomes the second engagement recess and the second engagement protrusion becomes the first engagement protrusion. The valve body and the power piston are connected to each other by passing through the respective engaging recesses and relatively rotating the two so that the first engaging protrusion and the second engaging protrusion are engaged with each other, and the power piston is connected to the valve body. In a power piston assembly for a brake booster in which a diaphragm is stretched on the back surface of the piston, a flange portion is formed on the outer periphery of the valve body, and the first engagement protrusion and the first engagement recess are formed in the flange portion. At the same time, an annular recess capable of accommodating the flange portion is formed on the inner peripheral portion of the power piston, and the second engagement protrusion and the second engagement recess are formed on the front side wall forming the annular recess. Further, the inner peripheral part of the diaphragm is housed in the annular recess from the back surface of the power piston beyond the inner peripheral part of the rear side wall of the annular recess, and the inner peripheral part of the diaphragm is connected to the rear side wall of the annular recess. An engagement claw is interposed between the rear end face of the flange portion to maintain airtightness between the power piston and the valve body, and further includes an engagement claw that penetrates the diaphragm and projects radially inward on the rear side wall. The engaging pawl is brought into contact with the stepped end surface formed on the valve body at a position radially inward from the inner circumference of the diaphragm, and the thrust applied to the power piston is transmitted to the valve body via the engaging pawl. A power piston assembly for a brake booster characterized by: