Motors: expansible chamber type – Working member position feedback to motive fluid control – Plural input signal means for single motor valve
Reexamination Certificate
2000-04-28
2001-11-27
Ryznic, John E. (Department: 3745)
Motors: expansible chamber type
Working member position feedback to motive fluid control
Plural input signal means for single motor valve
Reexamination Certificate
active
06321633
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a booster of control type capable of automatically increasing and decreasing an output by electromagnetically operating an atmospheric valve or a vacuum valve.
As an example of a conventional booster of this kind, as disclosed in Japanese Patent Laid-open No. 7-503124 (1995), there is a booster in which a solenoid mechanism is incorporated into a valve body, and a movable member of the solenoid mechanism is shifted by applying electricity to a solenoid of the solenoid mechanism, and a valve mechanism (atmospheric valve or vacuum valve) is opened by the shifting movement of the movable member, independently from the valve operation based on displacement of an input rod cooperating with a brake pedal.
In the booster having the above-mentioned solenoid mechanism, similar to the output in a case where the booster is operated by operating the valve mechanism by the input rod cooperating with the brake pedal, it is desired that the output can also be adjusted within a wide range by the operation of the solenoid mechanism.
However, in the above-mentioned conventional technique, the solenoid mechanism merely controls an opening amount of the valve mechanism on the basis of magnitude of an electric current supplied to the solenoid, but, there is no mutual relationship (proportional relationship) between the magnitude of the electric current supplied to the solenoid mechanism and magnitude of the output of the booster.
Thus, in order to control the output of the booster to desired magnitude by the operation of the solenoid mechanism, for example, as is in an output signal of a master cylinder pressure sensor for detecting pressure of braking liquid outputted from a master cylinder, it is required that a signal corresponding to the output of the booster be fed-back to control the operation of the solenoid mechanism.
To this end, since a sensor for outputting a signal corresponding to the output of the booster such as the master cylinder pressure sensor must be provided additionally, the entire system becomes more expensive.
SUMMARY OF THE INVENTION
The present invention aims to eliminate the above-mentioned conventional drawback, and an object of the present invention is to provide a booster having a simple construction, in which magnitude of an output can be adjusted within a wide range also by an operation of a solenoid mechanism.
According to one aspect of the present invention, there is provided a booster wherein an interior of a housing is divided into a constant pressure chamber and a variable pressure chamber by a power piston, and a valve mechanism for controlling supply of operating fluid to the variable pressure chamber by a shifting movement of a plunger connected to an input rod cooperating with a brake pedal is provided within a valve body supported by the power piston, so that a thrust force generated on the power piston by pressure difference created between the variable pressure chamber and the constant pressure chamber based on an operation of the valve mechanism is outputted. The booster further comprises an electromagnetic biasing means having a movable member slidably provided within the valve body and having one end for operating the valve mechanism independently from an operation of the input rod, whereby the pressure in the variable pressure chamber acts on one end of the movable member and pressure in the constant pressure chamber acts on the other end of the movable member.
According to another aspect of the present invention, there is provided a booster wherein an interior of a housing is divided into a constant pressure chamber and a variable pressure chamber by a power piston, and a valve mechanism for controlling supply of operating fluid to the variable pressure chamber by a shifting movement of a plunger connected to an input rod cooperating with a brake pedal is provided within a valve body supported by the power piston, so that a thrust force generated on the power piston by pressure difference created between the variable pressure chamber and the constant pressure chamber based on an operation of the valve mechanism is transmitted to an output shaft via a reaction disc. The booster further comprises an electromagnetic biasing means having a movable member slidably provided within the valve body for operating the valve mechanism independently from an operation of the input rod, and a reaction force transmitting member for transmitting a part of a reaction force from the reaction disc to the movable member.
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Matsunaga Kunihiro
Obata Takuya
Takayama Toshio
Ryznic John E.
Tokico Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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