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JPS568749A - Negative pressure type servo unit - Google Patents

Negative pressure type servo unit

Info

Publication number
JPS568749A
JPS568749A JP8342479A JP8342479A JPS568749A JP S568749 A JPS568749 A JP S568749A JP 8342479 A JP8342479 A JP 8342479A JP 8342479 A JP8342479 A JP 8342479A JP S568749 A JPS568749 A JP S568749A
Authority
JP
Japan
Prior art keywords
valve
plunger
valve body
negative pressure
valve plunger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8342479A
Other languages
Japanese (ja)
Inventor
Tadao Teimoto
Katsuyuki Yoshizawa
Katsuhiro Morita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP8342479A priority Critical patent/JPS568749A/en
Publication of JPS568749A publication Critical patent/JPS568749A/en
Pending legal-status Critical Current

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  • Braking Systems And Boosters (AREA)

Abstract

PURPOSE: To obtain a good braking effect of a brake by constituting a negative pressure type servo unit such that a projection is provided at least at one of a valve plunger and an abutting surface of a reaction plate so as to enable a rapid rise of hydraulic pressure in a master cylinder.
CONSTITUTION: Upon treadling down a brake pedal for braking, a valve operating rod 14 connected with the brake pedal is pushed in a direction A against the urging of a spring 16. A valve body 10 and a valve plunger 15 are thereupon moved leftwardly in an integral relationship with a movable end portion of the valve body 10 kept contacted with the valve plunger 15 as shown in the drawing due to the urging of a spring 17 (that is, in a closed position of an air valve 18). When the movable end of the valve body 10 is seated on a shoulder 4b, then a vacuum valve 11 is closed. If the pedal is thereafter treadled down further, the air valve 18 is opened to allow atmospheric air to be introduced into a variable pressure chamber 8 so that a power piston 4 is moved leftwardly. A projection 15a is provided on an end face of the valve plunger 15 which is contacted with a reaction plate 20 by the leftward movement of the power piston 4.
COPYRIGHT: (C)1981,JPO&Japio
JP8342479A 1979-07-03 1979-07-03 Negative pressure type servo unit Pending JPS568749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8342479A JPS568749A (en) 1979-07-03 1979-07-03 Negative pressure type servo unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8342479A JPS568749A (en) 1979-07-03 1979-07-03 Negative pressure type servo unit

Publications (1)

Publication Number Publication Date
JPS568749A true JPS568749A (en) 1981-01-29

Family

ID=13802047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8342479A Pending JPS568749A (en) 1979-07-03 1979-07-03 Negative pressure type servo unit

Country Status (1)

Country Link
JP (1) JPS568749A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57127051U (en) * 1981-02-03 1982-08-07
JPS6276764U (en) * 1985-10-30 1987-05-16
JPH0454760U (en) * 1990-09-18 1992-05-11
JP2001158339A (en) * 1999-11-30 2001-06-12 Aisin Seiki Co Ltd Hydraulic brake device for vehicle
JP2005313896A (en) * 2004-04-29 2005-11-10 Robert Bosch Gmbh Brake with booster having feeler provided with stud
JP2008081069A (en) * 2006-09-29 2008-04-10 Bosch Corp Negative pressure booster and brake booster with the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57127051U (en) * 1981-02-03 1982-08-07
JPS6276764U (en) * 1985-10-30 1987-05-16
JPH0454760U (en) * 1990-09-18 1992-05-11
JP2001158339A (en) * 1999-11-30 2001-06-12 Aisin Seiki Co Ltd Hydraulic brake device for vehicle
JP2005313896A (en) * 2004-04-29 2005-11-10 Robert Bosch Gmbh Brake with booster having feeler provided with stud
JP2008081069A (en) * 2006-09-29 2008-04-10 Bosch Corp Negative pressure booster and brake booster with the same
WO2008044610A1 (en) 2006-09-29 2008-04-17 Bosch Corporation Negative pressure booster and brake booster using the same

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