JPH0296352U - - Google Patents

Description

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

第１図は、この考案によるタンデム型負圧式倍
力装置の一実施例を示す側断面図、そして、第２
図は、第１図の―線に沿つた断面図である。 １０……タンデムブースタ、２２……フロント
シエル、２４……リアシエル、４０……ハブ部材
、４２……主部分、４２ｄ……溝（深く形成した
部分）、５０……弁孔、６０……中間隔壁、６３
……筒部、７１……第１ダイヤフラム、７２……
第２ダイヤフラム、７１ａ，７２ａ……内周ビー
ド部、６５１，６５２……溝、１１１……第１通
路、１１２……第２通路、２０１，２０２……保
護部材。 FIG. 1 is a side sectional view showing one embodiment of a tandem type negative pressure booster according to this invention, and a second
The figure is a sectional view taken along the line -- in FIG. 10...Tandem booster, 22...Front shell, 24...Rear shell, 40...Hub member, 42...Main part, 42d...Groove (deeply formed part), 50...Valve hole, 60...Intermediate Bulkhead, 63
... Cylinder part, 71 ... First diaphragm, 72 ...
Second diaphragm, 71a, 72a...inner peripheral bead portion, 651, 652...groove, 111...first passage, 112...second passage, 201, 202...protection member.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] フロントシエルとリアシエルとを結合して形成
され、中間隔壁により前後一対の内部空所を有す
るケーシングと、リアシエルおよび中間隔壁を各
々シール装置を介在して摺動自在に配置されるハ
ブ部材と、このハブ部材に対して前記一対の内部
空所で各々取り付けられ、各内部空所を外部負圧
源に連絡される前方側の定圧室と後方側の変圧室
とに各々区分する一対のピストンと、前記ハブ部
材に形成され、後方側から入力部材が入り込む弁
孔と、前記ハブ部材に形成され、各内部空所の定
圧室同士および変圧室同士を連絡する第１通路お
よび第２通路と、前記ハブ部材に形成され、前記
弁孔と少なくとも一方の定圧室および少なくとも
一方の変圧室とを各別に連絡する第３通路および
第４通路と、前記弁孔の内部に配置され、変圧室
の外気および定圧室への連通、遮断を、入力部材
からの入力に応じて制御する弁装置と、前記ハブ
部材の前方側の端部に配置され、出力を伝達する
出力部材とを備え、前記ピストンは、ハブ部材に
はまり合う孔を有し、その孔の内周部がハブ部材
に係合するプレート部材と、そのプレート部材に
沿つて延び、内周ビード部がハブ部材の外周に形
成した溝に入りプレート部材の内周部で圧縮され
、外周ビード部がケーシングに支持されたダイヤ
フラムとから構成され、前記第２通路の前方側の
変圧室に対する開口を、ダイヤフラムの内周ビー
ド部を入れる溝の後方側の隣接した個所に設けた
タンデム型負圧式倍力装置において、前記開口と
溝とを直接連らなつた構成とし、しかも、その開
口もしくは開口に連らなる溝の一部を前記溝の深
さよりも深く形成し、その深く形成した部分に、
前記内周ビード部が開口側へ変形するのを防止す
る保護部材を設けたタンデム型負圧式倍力装置。 A casing formed by joining a front shell and a rear shell and having a pair of front and rear internal cavities formed by an intermediate partition wall; a hub member slidably disposed between the rear shell and the intermediate partition wall through sealing devices; a pair of pistons each attached to the hub member at the pair of internal cavities and dividing each internal cavity into a constant pressure chamber on the front side and a variable pressure chamber on the rear side, which are connected to an external negative pressure source; a valve hole formed in the hub member into which the input member enters from the rear side; a first passage and a second passage formed in the hub member that connect constant pressure chambers and variable pressure chambers in each internal cavity; A third passage and a fourth passage are formed in the hub member and separately communicate the valve hole with at least one constant pressure chamber and at least one variable pressure chamber, and are arranged inside the valve hole and communicate with the outside air of the variable pressure chamber and The piston includes a valve device that controls communication with and isolation from the constant pressure chamber according to an input from an input member, and an output member that is disposed at the front end of the hub member and transmits an output, and the piston It has a hole that fits into the hub member, and the inner peripheral part of the hole has a plate member that engages with the hub member, and the inner peripheral bead part that extends along the plate member and enters the groove formed on the outer periphery of the hub member. A diaphragm is compressed at the inner peripheral part of the plate member and the outer peripheral bead part is supported by the casing. In a tandem negative pressure booster installed at an adjacent location on the side, the opening and the groove are directly connected, and the opening or a part of the groove connected to the opening is set to the depth of the groove. It is formed deeper than that, and in that deeply formed part,
A tandem negative pressure booster including a protective member that prevents the inner peripheral bead portion from deforming toward the opening side.