JPH0240664U

JPH0240664U -

Info

Publication number: JPH0240664U
Application number: JP11983188U
Authority: JP
Priority date: 1988-09-14
Filing date: 1988-09-14
Publication date: 1990-03-20

Description

[Brief explanation of drawings]

第１図は、この考案の一実施例を示す断面構造
図、第２図は、キー部材を示す図である。１０…負圧ブースタ、２０…本体、２３…定圧
室、２５…変圧室、４０…可動体、５０…ハブ部
、５５…段部、６０…プレート部、６１…折返し
部、６１ａ…端面、６４…案内筒部、７０…戻し
ばね、８０…内孔、８２，８４…通路、８８…入
力部材、９２…出力部材、１１０…キー部材。 FIG. 1 is a sectional structural view showing an embodiment of this invention, and FIG. 2 is a view showing a key member. DESCRIPTION OF SYMBOLS 10... Negative pressure booster, 20... Main body, 23... Constant pressure chamber, 25... Variable pressure chamber, 40... Movable body, 50... Hub part, 55... Step part, 60... Plate part, 61... Turned part, 61a... End surface, 64 ...Guide tube portion, 70...Return spring, 80...Inner hole, 82, 84...Passage, 88...Input member, 92...Output member, 110...Key member.

Claims

[Scope of utility model registration request]

A main body forming an internal cavity, a movable body that is movably inserted into the internal cavity and whose rear end penetrates the main body and projects to the outside, and a rear side that is divided into the internal cavity by this movable body. A variable pressure chamber, a constant pressure chamber on the front side that is connected to a negative pressure source, an inner hole formed in the movable body that communicates with the outside air, and two passages that connect this inner hole to the variable pressure chamber and the constant pressure chamber, respectively. , an input member that enters the inner hole of the movable body from the outside, a valve device that controls communication and shutoff of the variable pressure chamber to the constant pressure chamber and the outside air according to the input from the input member, and an output provided on the front side of the movable body. The movable body is a negative pressure booster which has a divided structure of a hub part which is a plastic molded product and contains a valve device therein, and a plate part which is a press molded product and is attached to the outer periphery of the hub part. A step part is formed on the outer periphery of the hub part with a small diameter on the rear side and a large diameter on the front side, and a guide cylinder part is formed on the inner periphery of the plate part and fits into the front side of the step part on the outer periphery of the hub part. and a folded part formed by folding back the end of the guide cylinder part inward, and the end face of the folded part is engaged with a stepped part on the outer periphery of the hub part.