JPH02128829U

JPH02128829U -

Info

Publication number: JPH02128829U
Application number: JP3767489U
Authority: JP
Priority date: 1989-03-31
Filing date: 1989-03-31
Publication date: 1990-10-24
Anticipated expiration: 2004-03-31
Also published as: JPH0638180Y2

Description

[Brief explanation of drawings]

第１図は本考案に係るクラツチ倍力装置の一実
施例を示した縦断面図、第２図はその装置のコン
トロールバルブ部の作動状態を示した断面図、第
３図はその装置のヒステリシスを従来の装置と比
較して示したグラフ、第４図は本考案に係るクラ
ツチ倍力装置の他の実施例を示したコントロール
バルブ部の断面図、第５図は従来から実施されて
いるクラツチ操作システムを示した図、第６図は
従来のクラツチ倍力装置のコントロールバルブを
示した断面図、第７図はそのコントロールバルブ
の作動状態を示した断面図である。２０……クラツチ倍力装置、２１……パワーシ
リンダ部、２２……ハイドロリツクシリンダ部、
２３……コントロールバルブ部、２４……ハウジ
ング、２４ａ……弁座、２６……パワーピストン
、２９……圧力室、３１……中継ピストン、３２
……プツシユロツド、３３……出力ロツド、４０
……油液ポート、４１……第１の通路、４３……
弁体、４３ａ……大径部、４３ｂ，４３ｂ′……
小径部、４３ｃ……弁座、４４……バルブリフタ
、４４ａ……一端部、４４ｂ……中央部、４４ｃ
……他端部、４４ｄ……弁座、４５……空圧室、
４６……変圧室、４７……油圧室、４８……管路
、４９……第２の通路、５０……ピストンガイド
、５１……室、５２……通路、５３……圧縮スプ
リング、５４……室、５５……ポート、５６……
通路、５７……圧縮スプリング、５８……室。 Fig. 1 is a longitudinal sectional view showing an embodiment of the clutch booster according to the present invention, Fig. 2 is a sectional view showing the operating state of the control valve section of the device, and Fig. 3 is the hysteresis system of the device. Fig. 4 is a sectional view of the control valve section showing another embodiment of the clutch booster according to the present invention, and Fig. 5 is a graph showing a comparison of the clutch booster according to the present invention. FIG. 6 is a sectional view showing a control valve of a conventional clutch booster, and FIG. 7 is a sectional view showing the operating state of the control valve. 20...Clutch booster, 21...Power cylinder section, 22...Hydraulic cylinder section,
23... Control valve part, 24... Housing, 24a... Valve seat, 26... Power piston, 29... Pressure chamber, 31... Relay piston, 32
...Push rod, 33...Output rod, 40
... Oil port, 41 ... First passage, 43 ...
Valve body, 43a...large diameter section, 43b, 43b'...
Small diameter part, 43c...Valve seat, 44...Valve lifter, 44a...One end, 44b...Central part, 44c
...Other end, 44d...Valve seat, 45...Pneumatic chamber,
46... Variable pressure chamber, 47... Hydraulic chamber, 48... Piping, 49... Second passage, 50... Piston guide, 51... Chamber, 52... Passage, 53... Compression spring, 54... ...Room, 55...Port, 56...
Passage, 57...compression spring, 58...chamber.

Claims

[Claims for Utility Model Registration] (1) Inside the valve housing, a pneumatic chamber is communicated with an air reservoir, a variable pressure chamber is communicated with a power cylinder, and a hydraulic pressure is communicated with a master cylinder, through a valve body and a valve lifter. The hydraulic fluid in the master cylinder is forced into the hydraulic chamber to operate the valve lifter, the valve lifter is brought into contact with the valve body, and the valve body is opened to open the valve body. In a clutch booster equipped with a control valve that causes compressed air from the air reservoir to flow into the variable pressure chamber from the pressure chamber and feeds the compressed air to the power cylinder via the variable pressure chamber, the air pressure chamber is defined. A piston consisting of a large diameter part and a small diameter part is disposed on the chamber wall, and a valve seat is formed at the end of the large diameter part of the piston to constitute the valve body, and the cross sectional area of the large diameter part is is equal to the pressure acting area of the valve body on the variable pressure chamber side when the valve lifter is not in contact with it, and the area of the step formed by the large diameter part and the small diameter part is equal to the area in which the valve lifter is in contact with the pressure area of the variable pressure chamber side. A clutch booster characterized in that the pressure acting area of the variable pressure chamber side of the valve body is equal to the pressure acting area of the variable pressure chamber in the state in which the clutch booster is in a state in which the pressure of the variable pressure chamber is applied at all times to the stepped portion. (2) the inside of the valve housing is defined by the valve body and the valve lifter into a pneumatic chamber that communicates with the air reservoir, a variable pressure chamber that communicates with the power cylinder, and a hydraulic chamber that communicates with the master cylinder; The oil in the master cylinder is forced into the hydraulic chamber to operate the valve lifter, the valve lifter is brought into contact with the valve body, and the valve body is opened to allow compressed air from the air reservoir to flow from the pneumatic chamber. In a clutch booster equipped with a control valve that allows compressed air to flow into the variable pressure chamber and sends the compressed air to the power cylinder via the variable pressure chamber, a large diameter A piston consisting of a large-diameter portion and a small-diameter portion is disposed, and a valve seat is formed at the end of the large-diameter portion of the piston to constitute the valve body, and the cross-sectional area of the large-diameter portion is not in contact with the valve lifter. the pressure acting area on the variable pressure chamber side of the valve body in the state is equal to the pressure acting area on the variable pressure chamber side, and the cross-sectional area of the small diameter portion is equal to the pressure acting area on the variable pressure chamber side of the valve body in the state in which the valve lifter is in contact with the valve lifter,
Furthermore, the clutch booster is characterized in that the pressure of the variable pressure chamber is constantly applied to the end of the small diameter portion.