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1. CN103702877 - Negative pressure servo device

Office
China
Application Number 201280035638.8
Application Date 19.07.2012
Publication Number 103702877
Publication Date 02.04.2014
Grant Number 103702877
Grant Date 20.05.2015
Publication Kind B
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
CPC
B60T 13/565
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL
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
565characterised by being associated with master cylinders, e.g. integrally formed
B60T 13/57
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL
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
57characterised by constructional features of control valves
Applicants ADVICS CO., LTD.
Inventors TERASAKI YOICHI
SAKAI TOMOYASU
NAKAGAWA MASAKI
Agents li xiang shu yanjun
Priority Data 2011159857 21.07.2011 JP
Title
(EN) Negative pressure servo device
(ZH) 负压式增力装置
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).

(ZH)

本发明提供负压式增力装置。将滑阀(60)保持在前方规定位置的保持单元具备以能够沿径向直线移动的方式组装于动力活塞(30)的卡止部件(64)和对该卡止部件(64)朝径向内侧施力的箍簧(65)。在卡止部件(64)设置有能够与设置于滑阀(60)的钩(60b)卡合/脱离、且与箍簧(65)等构成上述保持单元的钩(64a)。当柱塞(41)相对于动力活塞(30)前进大于规定值时,卡止部件(64)的从动斜面(64c)由柱塞(41)的推动斜面(41d)朝径向外侧推动,卡止部件(64)的钩(64a)从滑阀(60)的钩(60b)脱离。与键部件(63)对应地在动力活塞(30)设置有退让部(30m)。由此,能够以不产生新的课题(成本上升/轴向尺寸增加等)的方式解决因键部件的弯曲变形而导致的不良情况。