CN106218608A - 一种液压助力器 - Google Patents
一种液压助力器 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE 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
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE 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
- B60T13/00—Transmitting 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
- B60T13/10—Transmitting 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 with fluid assistance, drive, or release
- B60T13/12—Transmitting 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 with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting 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 with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/145—Master cylinder integrated or hydraulically coupled with booster
- B60T13/146—Part of the system directly actuated by booster pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE 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
- B60T13/00—Transmitting 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
- B60T13/10—Transmitting 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 with fluid assistance, drive, or release
- B60T13/12—Transmitting 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 with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting 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 with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/147—In combination with distributor valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE 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
- B60T13/00—Transmitting 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
- B60T13/10—Transmitting 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 with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE 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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/44—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
- B60T8/441—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters
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Abstract
本发明涉及机动车辆中的制动***,具体是一种液压助力器,包括主缸总成、踏板装置等,具体,阀体与主缸总成的非盲端连接,泄压座活动地***阀体内壁,泄压座与主缸第一活塞之间形成加压腔,浮动活塞的一端活动地***阀体内,并与泄压座接触;浮动活塞内孔活动地***伺服活塞,伺服活塞与浮动活塞之间设置有始动弹簧,伺服活塞具有进液腔,进液腔内设置有伺服回位弹簧和伺服阀,伺服阀与浮动活塞之间设置有伺服阀推杆;所述踏板推力活塞活动地***浮动活塞中,踏板推力活塞与伺服活塞之间设置有踏板感觉模拟弹簧;踏板推力活塞的左端与踏板装置连接。在整车中布置方便、成本较低,能简便地实现踏板感觉的模拟,还可消除ABS工作时的泵回冲击。
Description
技术领域
本发明涉及机动车辆中的制动***,具体是一种液压助力器。
背景技术
现有技术的汽车用助力器,大部分是真空助力器,真空由发动机产生,它有真空度不稳定、体积庞大、在发动机仓的布置困难、有ABS泵回冲击等缺点。在纯电动车上没有了发动机,真空需要通过电动真空泵产生,成本有较大增加。液压助力器就成为解决这个问题的一个有效途径。专利CN201510934534.6披露了一种液压助力器:它设置有低压储能器及踏板感觉模拟装置。专利CN201280003157.9披露了一种液压助力器:它设置了一个止回阀。液压助力器需要较简便地解决2个主要问题:一个是踏板感觉的模拟,一个是减少ABS工作时的泵回冲击。
发明内容
本发明的目的是提供一种在整车中布置方便、成本较低的液压助力器,能简便地实现踏板感觉的模拟,还可消除ABS工作时的泵回冲击。
为了实现上述目的本发明采用如下技术方案:一种液压助力器,包括主缸总成、踏板装置,所述主缸总成具有主缸第一活塞,主缸第一活塞活动地穿入主缸总成,还包括浮动活塞、泄压座、阀体、始动弹簧、伺服阀推杆、伺服阀、伺服回位弹簧、踏板感觉模拟弹簧、伺服活塞和踏板推力活塞,其中所述阀体与主缸总成的非盲端连接,泄压座活动地***阀体内壁,泄压座与主缸第一活塞之间形成加压腔,浮动活塞的一端活动地***阀体内,并与泄压座接触;浮动活塞内孔活动地***伺服活塞,伺服活塞与浮动活塞之间设置有始动弹簧,伺服活塞一端具有进液腔,进液腔通过浮动活塞及阀体的孔与车辆的液压源相通,进液腔内设置有伺服回位弹簧和与伺服回位弹簧接触的伺服阀,伺服阀与浮动活塞之间设置有伺服阀推杆;所述踏板推力活塞活动地***浮动活塞中,踏板推力活塞与伺服活塞之间设置有踏板感觉模拟弹簧;踏板推力活塞的左端与踏板装置连接。
在以上技术方案的基础上,进一步,所述伺服活塞的另一端设置有伺服活塞挡圈,伺服活塞挡圈设置于浮动活塞内壁的环形凹槽内。
所述伺服阀与伺服活塞之间设置有伺服阀密封圈。所述伺服阀密封圈与伺服阀固连,或伺服阀密封圈与伺服活塞固连。
在所述浮动活塞和泄压座之间设置泄压密封圈。
具体地,所述踏板推力活塞的左端与踏板装置的踏板推杆铰接。
所述浮动活塞与伺服活塞的左端设置有可调间隙A。
所述伺服阀推杆一端与浮动活塞固连,另一端为自由端,与伺服阀之间具有可调间隙B;或伺服阀推杆一端与伺服阀固连,另一端为自由端,与浮动活塞之间具有可调间隙B。
所述加压腔由泄压座、阀体和主缸第一活塞外径密封形成,或由泄压座和主缸第一活塞内径密封形成。
所述主缸总成为补偿孔式主缸,或中心阀式主缸,或柱塞式主缸。
由于上述结构,本发明能使它在整车中布置方便、成本较低,能简便地实现踏板感觉的模拟,还可消除ABS工作时的泵回冲击。在布置时可以使用原车的主缸总成,从而使布置方便、成本低。
附图说明
图1为本发明非工作状态的示意图;
图2为常规制动助力状态的示意图;
图3为强力制动助力结束后的示意图;
图4为助力液压失效时的应急制动状态的示意图;
图5为加压腔结构示意图;
图中:1-1伺服阀密封圈;1-2浮动活塞;1-3泄压密封圈;1-4泄压座;1-5阀体;1-6密封圈;1-7加压腔;1-8始动弹簧;1-9伺服阀推杆;1-10伺服阀;1-11进液腔;1-12伺服阀回位弹簧;1-13伺服活塞挡圈;1-14踏板感觉模拟弹簧;1-15伺服活塞;1-16踏板推力活塞;2主缸总成;2-1主缸第一活塞;2-2第一制动腔;2-3主缸第二活塞;2-4第二制动腔;2-5第二腔补偿孔;2-6储液腔;2-7第一补偿孔;3踏板装置;3-1踏板推杆;3-2制动踏板。
具体实施方式
下面结合附图和实施例对本发明作进一步说明:
参见附图1,一种液压助力器,包括主缸总成2、踏板装置3,所述主缸总成2具有主缸第一活塞2-1、主缸第二活塞2-3和储液腔2-6,主缸第一活塞2-1和主缸第二活塞2-3分别活动地穿入主缸总成2,主缸总成2上还设置有第一补偿孔2-7和第二腔补偿孔2-5,在主缸第一活塞2-1和主缸第二活塞2-3之间为第一制动腔2-2,主缸第二活塞2-3和主缸总成2的盲端为第二制动腔2-4。还包括浮动活塞1-2、泄压座1-4、阀体1-5、始动弹簧1-8、伺服阀推杆1-9、伺服阀1-10、伺服回位弹簧1-12、踏板感觉模拟弹簧1-14、伺服活塞1-15和踏板推力活塞1-16,其中所述阀体1-5与主缸总成2的非盲端连接,泄压座1-4活动地***阀体1-5内壁,泄压座1-4与主缸第一活塞2-1之间形成加压腔1-7,浮动活塞1-2的一端活动地***阀体1-5内,并与泄压座1-4接触;浮动活塞1-2内孔活动地***伺服活塞1-15,伺服活塞1-15与浮动活塞1-2之间设置有始动弹簧1-8,伺服活塞1-15一端具有进液腔1-11,进液腔1-11通过浮动活塞1-2及阀体1-5的孔与车辆的液压源相通,进液腔1-11内设置有伺服回位弹簧1-12和与伺服回位弹簧1-12接触的伺服阀1-10,伺服阀1-10与浮动活塞1-2之间设置有伺服阀推杆1-9;所述踏板推力活塞1-16活动地***浮动活塞1-2中,踏板推力活塞1-16与伺服活塞1-15之间设置有踏板感觉模拟弹簧1-14;踏板推力活塞1-16的左端与踏板装置3连接。踏板装置3包括踏板推杆3-1和制动踏板3-2,踏板推力活塞1-16的左端与踏板推杆3-1铰接。
所述伺服活塞1-15的另一端设置有伺服活塞挡圈1-13,伺服活塞挡圈1-13设置于浮动活塞1-2内壁的环形凹槽内。
所述伺服阀1-10与伺服活塞1-15之间设置有伺服阀密封圈1-1,伺服阀密封圈1-1与伺服阀1-10固连,或伺服阀密封圈1-1与伺服活塞1-15固连。在所述浮动活塞1-2和泄压座1-4之间设置泄压密封圈1-3。在阀体1-5与主缸总成的连接处设置有密封圈1-6。
所述浮动活塞1-2与伺服活塞1-15的左端设置有可调间隙A。
所述伺服阀推杆1-9一端与浮动活塞1-2固连,另一端为自由端;或伺服阀推杆1-9一端与伺服阀1-10固连,另一端为自由端。
所述加压腔1-7由泄压座1-4、阀体1-5和主缸第一活塞2-1外径密封形成,或由泄压座1-4和主缸第一活塞2-1内径密封形成(如图5)。
所述主缸总成2为补偿孔式主缸,或中心阀式主缸,或柱塞式主缸(固定密封圈式),或其它形式的主缸。
以上所述各弹簧即可是圆柱螺旋弹簧,也可是橡胶弹簧或波形弹簧。
参见图1,在非工作状态时,车辆中输入的液压PI通过阀体1-5及浮动活塞1-2的通道,进入伺服活塞1-15内的进液腔1-11,伺服阀1-10与伺服活塞之间被伺服活塞密封圈1-1封闭,S0=0,这时加压腔没有液压。
参见附图2,当需要制动时,踩下制动踏板3-2,推动踏板推力活塞1-16向右移动,通过踏板感觉模拟弹簧1-14对伺服活塞1-15施加推力,当推力大于始动弹簧1-8的起始力时,伺服活塞1-15与伺服阀1-10及伺服阀推杆1-9一起往右移动,伺服阀推杆1-9接触到浮动活塞1-2(B=0)后,将伺服阀1-10顶离伺服活塞1-15,S不等于0,进液腔1-11的液压油通过S这个间隙进入加压腔1-7,推动主缸第一活塞2-1向右移动,关闭第一、第二补偿孔,在主缸总成中建立起液压PO1、P02,输出到车轮进行制动。
踏板感觉的模拟功能说明:如上所述,当踩下制动踏板3-2装置,使进液腔1-11的液压油通过S这个间隙进入加压腔1-7后,它会产生使一个使伺服活塞1-15往左退的压力(以下简称回馈力),伺服活塞1-15的左边是踏板感觉模拟弹簧1-14,它传递过来的是踏板力转换过来的(以下简称踏板力),踏板力大于回馈力(为了方便后续描述,在这暂忽略始动弹簧1-8的力及摩擦力)时,伺服活塞1-15往右移,伺服阀1-10打开,更多的液压油进入加压腔1-7,加压腔1-7的液压上升,直至回馈力等于踏板力,伺服阀1-10关闭,伺服阀1-10就通过这种似闭非闭的状态,使踏板力等于回馈力,从而保证踏板力与主缸总成2的输出液压PO成线性关系。当持续加大踏板力,加压腔1-7的压力一直上升,直到加压腔1-7与进液腔1-11的压力相等,这时达到最大助力点,伺服阀1-10常开,主缸总成2的输出液压PO不再随着踏板力的增加而增加,这时A=0,B=0,S=A0-B0,见图3。当需要释放制动时,踏板力从大减小,踏板力持续小于回馈力,伺服阀1-10常闭,这时加压腔1-7的压力会推动浮动活塞1-2往左退,使浮动活塞1-2的右端与泄压座1-4的左端分开,加压腔1-7的液压会泄压到储液腔2-6,使主缸总成的输出液压PO也持续减小。踏板行程与踏板力的关系,则完全通过踏板感觉模拟弹簧1-14的刚度决定,这样使得踏板行程的调整变得较简单。
消除ABS工作时的泵回冲击功能说明:常规的助力器在ABS启动时,ABS的电动泵会将制动器中的制动液泵回主缸总成,从而使主缸内的液压瞬时大幅增加,由于主缸的液压与踏板力成线性关系,从而造成踏板力加大,给脚以巨大的冲击,使驾驶者感到不舒适。而本发明ABS启动时,主缸内的液压瞬时也会大幅增加,造成加压腔1-7的压力升高,这时踏板力小于回馈力,伺服阀1-10常闭,这时加压腔1-7的压力将会推动浮动活塞1-2往左退,使浮动活塞1-2的右端与泄压座1-4的左端分开,加压腔1-7增加的液压会泄压到储液腔2-6,使加压腔1-7的压力与踏板力匹配,从而消除了ABS工作时的泵回冲击。
助力液压失效时的应急制动状态说明:参见附图4,当车辆的液压***失效时,PI=0,这时踩下制动踏板装置3,浮动活塞1-2与内部的部件一起向前推动泄压座1-4及主缸第一活塞2-1向右移动,关闭第一、第二补偿孔,在主缸总成中建立起液压PO1、P02,输出到车轮进行制动,这时的输出液压由于没有助力,完全取决于踏板力及主缸缸径。
Claims (10)
1.一种液压助力器,包括主缸总成(2)、踏板装置(3),所述主缸总成(2)具有主缸第一活塞(2-1),主缸第一活塞(2-1)活动地穿入主缸总成(2),其特征在于:还包括浮动活塞(1-2)、泄压座(1-4)、阀体(1-5)、始动弹簧(1-8)、伺服阀推杆(1-9)、伺服阀(1-10)、伺服回位弹簧(1-12)、踏板感觉模拟弹簧(1-14)、伺服活塞(1-15)和踏板推力活塞(1-16),其中所述阀体(1-5)与主缸总成(2)的非盲端连接,泄压座(1-4)活动地***阀体(1-5)内壁,泄压座(1-4)与主缸第一活塞(2-1)之间形成加压腔(1-7),浮动活塞(1-2)的一端活动地***阀体(1-5)内,并与泄压座(1-4)接触;浮动活塞(1-2)内孔活动地***伺服活塞(1-15),伺服活塞(1-15)与浮动活塞(1-2)之间设置有始动弹簧(1-8),伺服活塞(1-15)一端具有进液腔(1-11),进液腔(1-11)通过浮动活塞(1-2)及阀体(1-5)的孔与车辆的液压源相通,进液腔(1-11)内设置有伺服回位弹簧(1-12)和与伺服回位弹簧(1-12)接触的伺服阀(1-10),伺服阀(1-10)与浮动活塞(1-2)之间设置有伺服阀推杆(1-9);所述踏板推力活塞(1-16)活动地***浮动活塞(1-2)中,踏板推力活塞(1-16)与伺服活塞(1-15)之间设置有踏板感觉模拟弹簧(1-14);踏板推力活塞(1-16)的左端与踏板装置(3)连接。
2.根据权利要求1所述一种液压助力器,其特征在于:所述伺服活塞(1-15)的另一端设置有伺服活塞挡圈(1-13),伺服活塞挡圈(1-13)设置于浮动活塞(1-2)内壁的环形凹槽内。
3.根据权利要求1所述一种液压助力器,其特征在于:所述伺服阀(1-10)与伺服活塞(1-15)之间设置有伺服阀密封圈(1-1)。
4.根据权利要求3所述一种液压助力器,其特征在于:所述伺服阀密封圈(1-1)与伺服阀(1-10)固连,或伺服阀密封圈(1-1)与伺服活塞(1-15)固连。
5.根据权利要求1所述一种液压助力器,其特征在于:在所述浮动活塞(1-2)和泄压座(1-4)之间设置泄压密封圈(1-3)。
6.根据权利要求1所述一种液压助力器,其特征在于:所述踏板推力活塞(1-16)的左端与踏板装置(3)的踏板推杆铰接。
7.根据权利要求1所述一种液压助力器,其特征在于:所述浮动活塞(1-2)与伺服活塞(1-15)的左端设置有可调间隙A。
8.根据权利要求1所述一种液压助力器,其特征在于:所述伺服阀推杆(1-9)一端与浮动活塞(1-2)固连,另一端为自由端;或伺服阀推杆(1-9)一端与伺服阀(1-10)固连,另一端为自由端。
9.根据权利要求1到8任一项所述一种液压助力器,其特征在于:所述加压腔(1-7)由泄压座(1-4)、阀体(1-5)和主缸第一活塞(2-1)外径密封形成,或由泄压座(1-4)和主缸第一活塞(2-1)内径密封形成。
10.根据权利要求9所述一种液压助力器,其特征在于:所述主缸总成(2)为补偿孔式主缸,或中心阀式主缸,或柱塞式主缸。
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