(19)
(11) EP 0 096 408 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.12.1984 Bulletin 1984/52

(43) Date of publication A2:
21.12.1983 Bulletin 1983/51

(21) Application number: 83105548

(22) Date of filing: 06.06.1983
(84) Designated Contracting States:
CH DE FR GB IT LI NL SE

(30) Priority: 04.06.1982 JP 9498582
04.06.1982 JP 9498682

(71) Applicants:
  • HITACHI, LTD.
     ()
  • Hitachi Automotive Engineering Co., Ltd.
     ()

(72) Inventors:
  • Ito, Tomoo
     ()
  • Kamifuji, Hiroshi
     ()
  • Kobayashi, Haruhiko
     ()
  • Itakura, Tomiya
     ()

   


(54) Pressure servomotor and throttle valve opening controller making use of pressure servomotor apparatus


(57) A pressure servomotor has a driving diaphragm for driving an operation shaft connected to a load. The position of the driving diaphragm is determined by a control position determining means which in turn operates a response to a control signal. When the driving diaphragm has been deflected to the control position determined by the control position determining means, the driving pressure applied to the driving diaphragm is weakened and, when the driving diaphragm is moved apart from the control position, the driving pressure applied to the driving diaphragm is in-creased. In consequence, the driving diaphragm is set at the control position determined by said control position determining means.






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