JPH02102869U

JPH02102869U -

Info

Publication number: JPH02102869U
Application number: JP1122589U
Authority: JP
Priority date: 1989-01-31
Filing date: 1989-01-31
Publication date: 1990-08-15

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す断面図、第２
図は第１図に示す実施例に利用される調整治具、
第３図は本考案における負圧式倍力装置の入力荷
重と出力荷重との関係を示す特性図である。１０……負圧式倍力装置、１１……ハウジング
、１２……パワーピストン、１２ａ……ハブ部材
、１２ｅ……大径孔、１２ｆ……小径孔、１３…
…ダイアフラム、１４……定圧室（前側室）、１
５……変圧室（後側室）、１９……コントロール
バルブ、２０……バルブプランジヤ、２３……プ
ツシユロツド、３４……出力部材、３５……環状
部材（第１部材）、３５ｃ……第１当接面、３６
……ロツド部材（第２部材）、３６ｂ……第２当
接面、３７……リアクシヨンデイスク。 Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure shows an adjustment jig used in the embodiment shown in FIG.
FIG. 3 is a characteristic diagram showing the relationship between input load and output load of the negative pressure booster according to the present invention. DESCRIPTION OF SYMBOLS 10... Negative pressure booster, 11... Housing, 12... Power piston, 12a... Hub member, 12e... Large diameter hole, 12f... Small diameter hole, 13...
...Diaphragm, 14...Constant pressure chamber (front chamber), 1
5... Variable pressure chamber (rear side chamber), 19... Control valve, 20... Valve plunger, 23... Push rod, 34... Output member, 35... Annular member (first member), 35c... First part tangential surface, 36
. . . Rod member (second member), 36b . . . Second contact surface, 37 . . . Reaction disk.

Claims

[Scope of utility model registration request]

A control valve mechanism that is operated by a push rod to control the pressure difference between the front and rear chambers of the power piston is incorporated in the power piston, and the power piston takes out the forward thrust generated in the power piston due to the pressure difference to the outside. A front end of a valve plunger in the control valve mechanism is connected to a large diameter hole into which the rear end of the output member is slidably inserted, and the large diameter hole is connected to the front end of the push rod, communicating with the large diameter hole via a step. a small-diameter hole into which the power piston is movably fitted; and a rear end surface between the step between the large-diameter hole and the small-diameter hole of the power piston and the rear end of the output member during non-boosting operation. A predetermined gap is provided between the valve plunger and the front end surface of the valve plunger, and when the booster is activated, the valve plunger is compressed by the power piston and the output member to push the valve plunger rearward and exert a reaction force on the push rod. In the negative pressure boosting reaction force mechanism, the output member is slidably fitted into the large diameter hole and at least the reaction disk is disposed when the booster is activated. a first member having a first contact surface that is compressible with the stepped portion and abuts on the front end surface of the reaction disk; and a second member having a second contact surface that can compressably abut against the front end surface of the reaction disk, and the second member contacts the first member when the booster is activated. The second contact surface is movable integrally with the first member, and engages with the first member so as to be able to move forward and backward from the outside of the negative pressure booster when the booster is not in operation, and the second contact surface is brought into contact with the first member. A reaction force mechanism for a negative pressure booster, characterized in that it can be adjusted to any position forward of the surface.