汽车真空助力器主缸工作原理

Actuation Principle of function 真空助力器制动主缸功能原理 No Vacuum Condition 无真空状态 Vacuum Valve 真空阀 Air Valve 空气阀 Working Chamber 工作腔Vacuum Chamber 真空腔 Air Valve Open Vacuum Valve Closed Key seated against rear shell Plunger valve seated on reaction disc 空气阀打开 真空阀关闭 键靠在后壳体上 柱塞阀顶在反作用盘上 At Balance 平衡状态 Patm - Ambient Atmospheric Pressure Pw - Working Chamber Pressure Pvac - Vacuum Chamber Pressure - Vacuum in front chamber pulls the diaphragm plate forward - Air valve closes - Vacuum valve opens - Vacuum in the working chamber increases until the pressure differential has reduced to ‘balance’ the diaphragm plate with both the air and vacuum valves closed -真空腔的真空吸引膜片盘向前运动 -空气阀关闭 -真空阀打开 -工作腔内的真空增加，直至两腔压力差降低到 “平衡状态”，膜片盘带动空气阀及真空阀全部 关闭 Brakes Applied 实施制动 Patm - Ambient Atmospheric Pressure Pw - Working Chamber Pressure Pvac - Vacuum Chamber Pressure - Force applied to the input rod opens theair valve - Vacuum in the rear chamber decreases,hence increasing the pressure differential - Diaphragm moves forward until the output rod force is equal to the input force multiplied by the boost ratio - Reaction disc extrudes around ratio disc - When the output force becomes greater than the input force multiplied by the boost ratio, the reaction disc extrudes further pushing the plunger valve back and closing the air valve Brakes Applied 实施制动 Patm - Ambient Atmospheric Pressure Pw - Working Chamber Pressure Pvac - Vacuum Chamber Pressure -在输入杆上加力使空气阀打开 -工作腔内的真空降低，因此两腔 压力差增加 -膜片向前运动，直到输出力等于 输入力乘以助力比 -反作用盘挤压包裹助力比调整盘 -当输出力大于输入力乘以助力比 时，反作用盘进一步挤压，推动柱 塞向后退（相对阀体而言），并将 空气阀关闭。 Brakes Released 释放制动（减轻制动） Patm - Ambient Atmospheric Pressure Pw - Working Chamber Pressure Pvac - Vacuum Chamber Pressure -Vacuum valve opens -真空阀打开 - Vacuum in the rear chamber increases, hence reducing the pressure differential -工作腔真空增加，因此两腔压力差降低 -Diaphragm plate assembly returns to the ‘balance’ (vacuum and air valves both closed) position due to the action of the main spring -在主回位弹簧的作用下，膜片盘组件回 复到“平衡状态”（空气阀及真空阀均为 关闭状态）。 Flow Through a Tandem Booster 双腔助力器内的空气流动情形 Vacuum Chamber Pressure PVAC 真空腔压力 PVAC Working Chamber Pressure PW 工作腔压力 PW Atmospheric Pressure PATM 大气压力 PATM . LSC 115 T HE DR shown in balance position LSC 115 HE DR 平衡状态示意图 Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. A 零件名称 Vac. non return valve 真空单向阀 Brake fluid 制动液 Booster housing 助力器壳体 Vacuum piston 真空活塞 Input rod 输入杆 Plunger 柱塞 Reaction piston 反作用杆 Reaction disc 反作用盘 Dilag bush 前围板 Poppet 提升阀 Atmospheric chamber 大气腔（工作腔） Vacuum chamber 真空腔 Vac. Seal 真空皮碗 MC housing 主缸缸体 Fluid reservoir 制动液贮液罐 Secondary piston 第二活塞 Primary piston 第一活塞 Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. B Symbolism 符号0,8 bar Vak 真空 Atmospheric 大气压Split linie booster – mc助力器主缸分界线 Poppet and springs 提升阀及弹簧 Brake fluid (pressure less) 制动液（小压力） Diaphragm 膜片 Sniffle holes 补偿孔 Reaction disc反作用盘 Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 1 Without vac. 不通真空 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 2 Evacuated 通真空 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 3 Lost stroke 空行程 F P Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 4 First air intake 首次进入空气 F P Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 5 MC closed 主缸关闭空行程 F P Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 6 Primary pressure 第一腔建压 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 7 Sec. piston move 第二活塞移动 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 8 Sec. Pressure 第二腔建压 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 9 Loop in range 圆弧段 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 10 Nom. control range 正常控制范围 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 11 Just below kneepoint 拐点之下 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 12 Just after kneepoint 略高于拐点 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 13 Plunger pushed VB 柱塞顶在阀体上 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Pic. 14 High above kneepoint 远高于拐点 P F Principle of function –Actuation 真空助力器制动主缸功能原理 Function at room temp / With volume displac. • Application speed about 3,5 mm/s • Pressure rise 15 +/- 5 bar/s A) Threshold load B) Loop in (tolerance range) C) Boost ratio ( i ) D) 90 % kneepoint pressure E) Kneepoint pressure F) Efficiency G) Beginnig of air absorbtion H) Hysteresis I) 10 % residual pressure J) Push back force K) Auxiliary force L) Higher vacuum level M) Function without vacuum Main function curve Characteristic Booster input load ( N ) P r i m a r y p r e s s u r e M C ( b a r ) Original diagram Principle of function –Actuation 真空助力器制动主缸功能原理 主要功能曲线 特性曲线 室温性能. •加力速度约 3,5 mm/s •升压速度 15 +/- 5 bar/s 助力器输入力( N ) 主 缸 第 一 腔 压 力 ( b a r ) A) 起始力 B) 圆弧段上点 (允差范围) C) 助力比 ( i ) D) 90 % 拐点压力 E) 拐点压力 F) 效率 G) 开始抽大气 H) 滞后 I) 10 % 剩余压力 J) 回推力 K) 助力 L) 更高真空度 M) 无真空曲线 原始图 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf Principle of function –Actuation 真空助力器制动主缸功能原理 Input load 输入力 ( N ) 200 150 100 A) 9“-Booster / 0,8 bar B) 10“-Booster / 0,8 bar C) 8 + 9“-Booster / 0,8 bar 100 200 N o t r e i n r o r c e d r a n g e 不 需 再 注 册 系 列 P r i m a r y p r e s s u r e 第 一 腔 压 力 ( b a r ) Without vacuum 无真空 Variations of function curve 功能曲线的变化 Control range 控制范围 I = 3 ,8 5 I = 3, 20 I = 5, 60 Kneepoint pressure 拐点压力 MC - Ø = 20,64 mm Principle of function –Actuation 真空助力器制动主缸功能原理 O u t p u t l o a d ( p r i m a r y p r e s s u r e ) 输 出 力 （ 第 一 腔 压 力 ） Function curve of conventional booster常规助力器功能曲线 The same curve will be achieved with the Brake assistant by slow application speed 带有辅助制动的助力器在慢速制动时其 曲线与此相同 Function curve from the „Brake-Assistant“ “辅助制动”功能曲线 Can only achieved by very high pedal application speed (BA and MBA) 只有在快速踩制动踏时才能达到 Possible characteristic of booster function curves 助力器功能曲线的可能特征 Function curve of Dual-Rate booster 双助力比助力器功能曲线 Nearly the same characteristic at high And slow application speed 在快速和慢速实施制动时的曲线特征 是相近的 Input load (pedal load)输入力（踏板力） Single Rate Operation 单助力比助力器 Single Rate Performance Curve 单助力比助力器特性曲线 Kneepoint Input O ut pu t Help force Run-out Line Boost Ratio Threshold Primary Jump-in Loop-in Region 200N Jump-in Dual Rate Operation 双助力比助力器 Dual Rate Performance Curve 双助力比助力器特性曲线 Kneepoint Input O ut pu t Help force Run-out Line Secondary Boost Ratio Threshold Transition Point Primary Jump-in Loop-in Region 200N Jump-in Primary Boost Ratio Actuation Principle of function真空助力器制动主缸功能原理 Principle of function –Actuation 真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Principle of function –Actuation真空助力器制动主缸功能原理 Single Rate Operation单助力比助力器 Dual Rate Operation双助力比助力器