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1. IN1292/CHENP/2014 - NEGATIVE PRESSURE SERVO DEVICE

Office
India
Application Number 1292/CHENP/2014
Application Date 19.02.2014
Publication Number 1292/CHENP/2014
Publication Date 01.07.2016
Publication Kind A
IPC
B60T 13/56
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
13Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
10with fluid assistance, drive, or release
24the fluid being gaseous
46Vacuum systems
52indirect, i.e. vacuum booster units
56with two-chamber booster units
Applicants ADVICS CO. LTD.
Inventors TERASAKI Yoichi
SAKAI Tomoyasu
NAKAGAWA Masaki
Priority Data 2011159857 21.07.2011 JP
Title
(EN) NEGATIVE PRESSURE SERVO DEVICE
Abstract
(EN)
A holding means for holding a slide valve (60) at a predetermined front position includes a locking member (64) assembled to a power piston (30) so as to be capable of moving linearly in the radial direction and a gutter spring (65) that impels the locking member (64) inward in the radial direction. The locking member (64) is provided with a hook (64a) that can be engaged to and disengaged from a hook (60b) provided to the slide valve (60) and forms the holding means with the gutter spring (65) or the like. When a plunger (41) advances with respect to the power piston (30) to an extent greater than a predetermined value a pressed slope surface (64c) of the locking member (64) is pressed outward in the radial direction by a pressing slope surface (41d) of the plunger (41) and the hook (64a) of the locking member (64) is detached from the hook (60b) of the slide valve (60). A relief part (30m) is provided in the power piston (30) corresponding to the key member (63). Thereby it is possible to solve the problems associated with defects due to bending deformation of the key member without causing new problems (increase in costs increase in axial dimensions or the like).

Also published as
IDIDP00201400969