CN103010197A - Mechanical vacuum booster - Google Patents
Mechanical vacuum booster Download PDFInfo
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- CN103010197A CN103010197A CN2012104948907A CN201210494890A CN103010197A CN 103010197 A CN103010197 A CN 103010197A CN 2012104948907 A CN2012104948907 A CN 2012104948907A CN 201210494890 A CN201210494890 A CN 201210494890A CN 103010197 A CN103010197 A CN 103010197A
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Abstract
A mechanical vacuum booster comprises a front shell, a back shell and a control valve assembly, wherein the front shell is connected with the back shell; the control valve assembly comprises a valve body, a big plunger and a proportion disk; the small plunger is arranged between the big plunger and the proportion disk; a step is arranged at the end part of the small plunger; and an automatic small plunger limiting and releasing device is arranged on a running passage of the small plunger. The mechanical vacuum booster can ensure a rapidly increasing output force at a certain input power under an emergency braking condition and can achieve pressure maintenance easily; the mechanical vacuum booster is novel in structure, simple in component structure and easy to implement; when a driver applies emergency braking, the pressure can be maintained under the condition that the input force is decreased, thus shortening the braking distance of a whole vehicle; therefore, the mechanical vacuum booster is very effective for an unskilled driver and a brake hesitator.
Description
Technical field
The invention belongs to the Manufacturing Technology for Automotive Parts field, specifically, relate to a kind of mechanical vacuum booster.
Background technology
At present, relate to brake system of car parts manufacturing technology field, vacuum booster is the critical component in the brake system of car, and its effect is that the vacuum of utilizing engine intake manifold vacuum or aux. vacuum pump to produce is amplified brake pedal force, thereby alleviates the power that chaufeur is used for braking.The cardinal principle of vacuum booster is that servo-unit has two chambeies: vacuum chamber and atmosphere chamber, and when servo-unit was worked, atmosphere chamber entered air, thus and generation draught head realization power-assisted effect between the vacuum chamber.
In the prior art, conventional vacuum booster plays the power-assisted effect when normally applying braking, alleviates the power that is used for braking of chaufeur.But because vacuum booster of the prior art lacks emergency braking function, therefore, there is following technical matters in vacuum booster of the prior art:
1, adopt vacuum booster of the prior art, when the chaufeur apply the emergency brake, chaufeur only applies in the situation of less treadle effort, can not increase rapidly the power-assisted effect of vacuum booster, causes the braking effect of car load not obvious.
2, adopt conventional vacuum booster of the prior art when apply the emergency brake, need chaufeur to apply larger treadle effort, particularly in the situation that treadle effort keep incessantly, this is a test to small and weak or unskilled chaufeur, and it is tired that chaufeur is produced, the generation that will lead to a disaster when serious.
Summary of the invention
Technical matters to be solved by this invention is, adopt vacuum booster of the prior art, when the chaufeur apply the emergency brake, only apply less treadle effort, can not increase rapidly the power-assisted effect of vacuum booster, cause the braking effect of car load not obvious, and required treadle effort is difficult for keeping, the technical matterss such as long-time easily fatigue, and a kind of mechanical vacuum booster is provided.Technical scheme of the present invention can guarantee the sufficient power-assisted effect that has of vacuum booster, thereby guarantees the braking effect of car load.
Technical conceive of the present invention is, conventional vacuum booster does not have emergency braking function in the prior art in order to solve, need larger treadle effort just can make braking effect obviously and the problem such as braking force maintenance, a kind of mechanical vacuum booster with emergency braking function has been proposed, set up locking and releasing mechanism in the small plunger position of existing machinery formula vacuum booster, so that chaufeur is when apply the emergency brake, as long as satisfy certain horsepower input (application force of the speed that horsepower input=input bar moves * input bar) requirement, vacuum booster can be to the larger application force of master brake cylinder output, and in the situation that Input Forces reduces, pressure is kept, thereby shorten the stopping distance of car load, especially particularly effective to unskilled chaufeur and the braking person of hesitating.
Technical scheme provided by the present invention is, a kind of mechanical vacuum booster, comprise front case, rear housing, control cock assembly, described front case links to each other with described rear housing, include valve body, large plunger, ratio dish in the described control cock assembly, be provided with small plunger between described large plunger and the described ratio dish, the end of described small plunger is provided with step, is provided with small plunger automatic spacing and decontrol at the operation passage of described small plunger.
Described small plunger automatic spacing and decontrol comprise pin, pin spring, valve body cover, sleeve, sleeve spring, locking plate, and described valve body is set in the described valve body, are provided with pin in the described valve body cover, and described pin is spacing by the pin spring; Described small plunger is sleeved in the described sleeve, and described sleeve contacts with described locking plate.
Described control cock assembly also comprises input bar, filter screen spring perch, inner filter core, cone-shaped spring, spring perch, vacuum valve seat, Compress Spring, vacuum leather cup, ratio dish, reaction plate, valve body cover, circlip, take-off lever etc., described large plunger small end cylindrical and sleeve inner circle free-running fit, described large plunger small end end is connected with described small plunger contact, described sleeve is packed in the described valve body interstitial hole, described sleeve is spacing by described sleeve spring, described sleeve step end end face is contacted with locking plate all the time, and described sleeve small end has the inclined-plane; Described valve body cover is set in the large end counterbore of described valve body, described valve body cover small end end face and described valve body counterbore end contact, and described roller is loaded on described valve body and puts in the radially-directed hole, and described pin is provided with the inclined-plane near sleeve small end one side.
In the normal brake application process, described large plunger promotes described small plunger and moves forward together, described sleeve small end is connected with the contact of described pin top always, and described pin is remained in the described valve body cover, guarantees that power passing ratio dish, small plunger, the large plunger of feedback passes to the input bar.
In the emergency brake operations process, described large plunger promotes the larger distance moving of the relatively described pin of described small plunger, step on the described small plunger is crossed described pin, and described sleeve is mobile backward under the effect of described sleeve spring, through hole during the valve body that makes the sleeve small end break away from described pin place overlaps, described pin is moving to the center under the effect of described pin spring on the cylindrical of small plunger, contact with the step of described small plunger, small plunger is carried out spacing, stop small plunger with the plunger rollback.
In the emergency braking dispose procedure, along with described vacuum valve is return and opened to the relatively described valve body of described large plunger, the pressure reduction between rear epitrochoidal chamber and the front epitrochoidal chamber rapidly disappears, and described valve body is under the effect of return big spring, and rollback is to initial position; Described locking plate contacts with described rear housing, thereby and be forced to the reach of relatively described valve body by described rear housing is spacing, this moment, described locking plate promoted described sleeve return, described sleeve small end inclined-plane contacts with described pin inclined-plane, force described pin to overcome described pin spring force and come back to original position, described small plunger is rollback under the effect of reaction plate, realizes that emergency braking discharges.
Described pin is at ordinary times by the state of small plunger and sleeve support, guarantees that small plunger can be free to slide between pin.When described small plunger slips over certain displacement and described sleeve after rollback certain displacement under the described sleeve spring effect, described pin is blocked the rollback of described small plunger by described pin spring ejection.
Place described small plunger between described large plunger and described ratio dish, described small plunger matches with described pin, realizes locking.
Adopt technical scheme provided by the present invention, can effectively solve vacuum booster of the prior art, when the chaufeur apply the emergency brake, only apply less treadle effort, can not increase rapidly the power-assisted effect of vacuum booster, cause the braking effect of car load not obvious, and required treadle effort is difficult for keeping the technical matterss such as long-time easily fatigue.Vacuum booster provided by the invention can be guaranteed in the situation that certain horsepower input obtains a power output that increases rapidly, and can easily obtain the pressure maintenance in the emergency braking situation.Simultaneously the present invention is also advantageous in that: novel structure, component structural is simple, be easy to realize, chaufeur is when apply the emergency brake, as long as satisfy certain horsepower input (application force of the speed that horsepower input=input bar moves * input bar) requirement, vacuum booster can be to the larger application force of master brake cylinder output, and in the situation that Input Forces reduces, pressure is kept, thereby the stopping distance of shortening car load is especially particularly effective to unskilled chaufeur and the braking person of hesitating.
Description of drawings
By reference to the accompanying drawings, the present invention is further illustrated:
Fig. 1 is vacuum booster assembly incipient state cutaway view of the present invention;
Fig. 2 is initial condition control cock assembly cutaway view of the present invention;
Fig. 3 is normal brake application state control cock assembly cutaway view of the present invention;
Fig. 4 is emergency braking excited state control cock assembly cutaway view of the present invention;
Fig. 5 is emergency braking hold mode control cock assembly cutaway view of the present invention;
Fig. 6 is emergency braking release position control cock assembly cutaway view of the present invention;
Wherein, 1-inputs bar, 2-inner filter core, 3-cone-shaped spring, the 4-spring perch, 5-Compress Spring, 6-vacuum leather cup, the large plunger of 7-, the large plunger atmospheric valve seat of 7a-boss, 8-locking plate, 9-small plunger, 10-pin, the 11-O RunddichtringO, 12-ratio dish, 13-take-off lever, the 14-big spring, 15-circlip, 16-reaction plate, epitrochoidal chamber (vacuum chamber) before the 17-, 18-front case, 19-diaphragm dish, the 20-epithelium, epitrochoidal chamber behind the 21-(atmosphere chamber), 22-rear housing, 23-pin spring, 24-valve body cover, 25-sleeve spring, the 26-sleeve, 27-O RunddichtringO, 28-vacuum valve seat, vacuum valve seat boss in the 29-valve body, 29a-valve body, 30-filter screen spring perch.
The specific embodiment
Shown in Fig. 1-6, a kind of mechanical vacuum booster with emergency braking function of technical scheme provided by the present invention, its control cock assembly comprises valve body 29, input bar 1, filter screen spring perch 30, cone-shaped spring 3, spring perch 4, Compress Spring 5, vacuum leather cup 6, vacuum valve seat 28, large plunger 7, small plunger 9, locking plate 8, sleeve 26, sleeve spring 25, valve body cover 24, pin 10, pin spring 23, ratio dish 12, reaction plate 16, take-off lever 13, circlip 15, described input bar 1 passes filter screen spring perch 30 successively, cone-shaped spring 3, spring perch 4, Compress Spring 5, vacuum leather cup 6, its bulb partly stretches in large plunger 7 counterbores, input bar 1 passes through riveting together with large plunger 7, but input bar 1 can rotate at a certain angle relative to large plunger 7, step on the described input bar 1 is pressed in that the contact left-hand thread connects on the step of filter screen spring perch 30 inwalls, described spring perch 4 is pressed on the vacuum valve seat 28 inner convex platform end faces, cone-shaped spring 3 is between filter screen spring perch 30 and spring perch 4, described vacuum leather cup 6 one ends have internal buckle ring to be positioned on vacuum valve seat 28 inner cylinder faces and are buckled in the circular groove of spring perch 4 lower ends, the other end end face of vacuum leather cup 6 is connected with vacuum valve seat boss 29a contact in the valve body, form vacuum valve between the vacuum valve seat boss 29a in the end face of described vacuum leather cup 6 and the valve body, described vacuum valve seat 28 end faces lean against on the valve body 29 interior step surfaces, there is circular groove in vacuum valve seat 28 outsides, assembling O RunddichtringO 27, seal with extraneous with epitrochoidal chamber 21 after guaranteeing servo-unit, atmospheric valve seat boss and vacuum leather cup 6 end contacts of described large plunger 7 large ends, form the atmosphere valve between atmospheric valve seat boss and vacuum leather cup 6 end faces, described large plunger 7 small end cylindricals and sleeve 26 inner circle free-running fits, the small end end is connected with small plunger 9 contacts, described locking plate 8 passes the radial slot at valve body 29 middle parts, locking plate 8 middle part inner circles and large plunger 7 middle part free-running fits, described sleeve 26 is packed in valve body 29 interstitial holes, sleeve 26 is spacing by sleeve spring 25, described sleeve 26 step end end faces are contacted with locking plate 8 all the time, described sleeve 26 small ends have the inclined-plane, described valve body cover 24 is set in the valve body 29 large end counterbores, valve body overlaps 24 small end end faces and valve body 29 counterbore end contacts, described roller is loaded on the valve body cover 24 in the radially-directed hole, pin 10 is spacing by pin spring 23, described pin 10 has the inclined-plane near sleeve 26 small ends one side, in non-emergent braking mode, pin 10 is withstood on sleeve 26 cylindricals by pin spring 23, described small plunger 9 is loaded in sleeve 26 endoporus, small plunger 9 has the step end to be connected with the contact of ratio dish 12 small ends, described ratio dish 12 is set in the valve body cover 24, the described valve body cover 24 large reaction plates 16 of packing in the counterbores of holding, described take-off lever 13 large end end faces are connected with reaction plate 16 end contacts, described take-off lever 13 is spacing by described circlip 15, and described circlip 15 is fitted in valve body 29 ends by big spring 14.In the normal brake application process, large small plunger 9 moves less displacement together relative to valve body 29, sleeve 26 small ends can not pushed up pin 10 in the valve body cover 24 fully by sleeve spring 25, small plunger 9 step surfaces are not crossed pin 10, valve body overlapped in 24 radial holes during pin 10 still kept, and pin 10 is spacing by sleeve 26 and small plunger 9 steps near center-side; In the emergency braking process, chaufeur is trampled brake pedal fast with certain speed, driving input bar 1 moves forward fast, and drive large plunger 7 and promote small plungers 9 relative pin 10 larger distance movings, step on the small plunger 9 is crossed pin 10, meanwhile sleeve 26 is mobile backward under the effect of sleeve spring 25, thereby the valve body that makes sleeve 26 small end leave pin 10 places fully overlaps the through hole in 24, pin 10 is moving to the center under the effect of pin spring 23 on the cylindrical of small plunger 9, block the step of small plunger 9, stop small plunger 9 with large plunger 7 rollbacks, thereby cut-out feedback force, realization easily keeps the atmosphere valve opening under less treadle effort, thereby realizes that atmosphere fully enters into the servo-unit epitrochoidal chamber, and the instantaneous maximum that reaches of servo force also can easily be kept.
Such as accompanying drawing 1, shown in 2, input bar 1 passes filter screen spring perch 30 successively, cone-shaped spring 3, spring perch 4, Compress Spring 5, vacuum leather cup 6, the bulb of input bar 1 partly stretches in the counterbore of large plunger 7, input bar 1 passes through riveting together with large plunger 7, but input bar 1 can rotate at a certain angle relative to large plunger 7, the step of input on the bar 1 is pressed in that the contact left-hand thread connects on the step of filter screen spring perch 30 inwalls, spring perch 4 is pressed on the vacuum valve seat 28 inner convex platform end faces, cone-shaped spring 3 is between filter screen spring perch 30 and spring perch 4, vacuum leather cup 6 one ends have internal buckle ring to be positioned on vacuum valve seat 28 inner cylinder faces and are buckled in the circular groove of spring perch 4 lower ends, the other end end face of vacuum leather cup 6 is connected with valve body 29 interior vacuum valve seat boss 29a contacts, form vacuum valve between the end face of vacuum leather cup 6 and the valve body 29 interior vacuum valve seat boss 29a, described vacuum valve seat 28 end faces lean against on the valve body 29 interior step surfaces, there is circular groove in vacuum valve seat 28 outsides, assembling O RunddichtringO 27, to guarantee the sealing of servo-unit epitrochoidal chamber, atmospheric valve seat boss 7a and vacuum leather cup 6 end contacts of large plunger 7 large ends, form the atmosphere valve between atmospheric valve seat boss 7a and vacuum leather cup 6 end faces, large plunger 7 small end cylindricals and sleeve 26 endoporus free-running fits, large plunger 7 small end ends are connected with small plunger 9 contacts, locking plate 8 passes the radial slot at valve body 29 middle parts, locking plate 8 middle part endoporus and large plunger 7 middle part free-running fits, sleeve 26 is packed in valve body 29 interstitial holes, sleeve spring 25 1 ends withstand on valve body 29 endoporus bottom, the other end withstands on the end face of locking plate 8, sleeve 26 is spacing by sleeve spring 25, sleeve 26 step end end faces are contacted with locking plate 8 all the time, valve body cover 24 is set in the valve body 29 large end counterbores, valve body overlaps 24 small end end faces and contacts with valve body 29 large end counterbore inner end surfaces, pin 10 is set in valve body and overlaps in the 24 radially-directed holes, pin 10 is subjected to the spring-force driven dual of pin spring 23, in non-emergent braking mode, pin 10 is withstood on sleeve 26 cylindricals by pin spring 23, small plunger 9 is loaded in sleeve 26 endoporus, small plunger 9 has the step end to be connected with the contact of ratio dish 12 small ends, ratio dish 12 is set in the valve body cover 24, the valve body cover 24 large reaction plates 16 of packing in the counterbores of holding, take-off lever 13 large end end faces are connected with reaction plate 16 end contacts, take-off lever 13 is spacing by circlip 15, and circlip 15 is fitted on the valve body 29 by big spring 14.
1. normal brake application process
With reference to the accompanying drawings 1,2,3, when beginning to brake, the Input Forces that brake pedal passes to input bar 1 overcomes cone-shaped spring 3 drags, promoting input bar 1 moves forward, input bar 1 promotes again large plunger 7 and moves together less displacement with small plunger 9 relative to valve body 29 and valve body cover 24, and valve body 29 is relative motionless with valve body cover 24.Input bar 1 promotes large plunger 7 and moves forward, vacuum leather cup 6 is spacing by the vacuum valve seat boss 29a in the valve body 29, atmospheric valve seat boss 7a on the large plunger 7 separates with the end face of vacuum leather cup 6, the atmosphere valve open, rear epitrochoidal chamber 21 begins to enter atmosphere, rear epitrochoidal chamber 21(atmosphere chamber) and front epitrochoidal chamber 17(vacuum chamber) between produce pressure reduction, promote valve body 29 and move forward.Sleeve 26 heads on locking plate 8 under the effect of sleeve spring 25 mobile backward, because normal brake application, large plunger 7 is little with respect to valve body 29 and 24 displacements of moving of valve body cover, the distance that sleeve 26 relative valve bodies 29 and valve body overlap 24 rollbacks is also less, sleeve 26 small ends can not push up the pin 10 in the valve body cover 24 fully, and pin 10 still is pressed on the sleeve 26 small end external cylindrical surfaces by pin spring 23.Meanwhile, large plunger 7 is little with respect to valve body 29 and 24 displacements of moving of valve body cover, large plunger 7 promotes again small plunger 9 and moves, small plunger 9 is also little with respect to 24 displacements of moving of valve body cover, the step of small plunger 9 large ends can not crossed the edge of pin 10, and small plunger 9 can free rollback after braking is removed.Along with the atmosphere valve open, rear epitrochoidal chamber 21 begins to enter atmosphere, servo-unit begins power-assisted, valve body 29 moves forward, to rest on a certain position motionless when brake pedal, input bar 1 and large plunger 7 are slack, valve body 29 continues reach under the effect of pressure reduction, vacuum leather cup 6 under the effect of Compress Spring 5 along with the vacuum valve seat boss 29a on the valve body 29 together mobile until vacuum leather cup 6 end faces contacts with atmospheric valve seat boss 7a on the large plunger 7, the atmosphere valve closing, this moment the atmosphere valve, vacuum valve all is in closed condition, and servo-unit is in the brake compensation state.
Loosen the brake, Input Forces diminishes, and input bar 1 is mobile backward under the effect of cone-shaped spring 3, and it is mobile backward to drive large plunger 7, and small plunger 9 is also mobile backward under the effect of feedback force.Along with large plunger 7 is mobile backward, overcome the drag of Compress Spring 5, it is also mobile backward that atmospheric valve seat boss 7a on the large plunger 7 drives vacuum leather cup 6, vacuum leather cup 6 end faces are separated with valve body 29 interior vacuum valve seat boss 29a, vacuum break valve, rear epitrochoidal chamber 21 and front epitrochoidal chamber 17 communicate, and two chambeies begin pressure release, under the effect of big spring 14, valve body 29 beginnings are mobile backward.When locking plate 8 with after rear housing 22 contacts, locking plate 8 is limited slack, large plunger 7 middle parts are by the spacing rollback that stops of locking plate 8 end faces, and this moment, valve body 29 continues mobile backward under the effect of big spring 14, until valve body vacuum valve seat boss 29a and vacuum leather cup 6 end contacts are closed vacuum valve, valve body moves after stopping, and servo-unit control cock assembly has been got back to again the initial condition position of not braking shown in Figure 2.
2. emergency braking working process
1) emergency braking excited state
With reference to the accompanying drawings 1,2,4, during emergency braking, brake pedal is stepped on rapidly, input bar 1 drives large plunger 7, small plunger 9 relative valve bodies 29 and valve body cover 24 have larger relative displacement, atmospheric valve seat boss 7a on the at this moment large plunger 7 separates with vacuum leather cup 6 end faces, the atmosphere valve open, rear epitrochoidal chamber 21 enters atmosphere, servo-unit begins power-assisted, promoting valve body 29 and valve body cover 24 moves forward, sleeve 26 cover with the effect of spring 25 under rollback backward, sleeve 26 small ends push up the pin 10 in the valve body cover 24 fully, and pin 10 diametrically can be not spacing by sleeve 26, meanwhile, because small plunger 9 moves larger displacement with respect to valve body cover 24, make the small plunger 9 large steps of holding cross the edge of pin 10 fully, pin 10 moves to the centre under the effect of pin spring 23 like this, and pin 10 tops are pressed on the external cylindrical surface of small plunger 9, emergency braking function is excited, as shown in Figure 4.After emergency braking function was excited, the power that feeds back by reaction plate 16 most ofly passed to valve body 29 through ratio dish 12, small plunger 9, pin 10, valve body cover 24, and the power that passes to large plunger 7 is very little, and then it is very little to feed back to the power of brake pedal.
2) emergency braking hold mode
With reference to the accompanying drawings 1,5, after emergency braking function is excited, if Input Forces reduces, it is mobile backward that feedback force can promote small plunger 9, small plunger 9 large end steps contact with pin 10 edges, pin 10 is overlapped again 24 spacing by valve body, along with Input Forces further reduces, large plunger 7 can continue mobile backward, small plunger 9 is by pin 10, valve body cover 24, valve body moves by 29 spacing can continuation backward, begin gapped this moment between large plunger 7 and the small plunger 9, if Input Forces continues to reduce, large plunger 7 continues to move backward until atmospheric valve seat boss 7a and vacuum leather cup 6 end contacts are closed the atmosphere valve relative to valve body 29, in this process, small plunger 9 relative valve body covers 24, valve body 29 is static, gap between small plunger 9 and the large plunger 7 is increasing, as long as pass to the Input Forces of servo-unit input bar 1 greater than the drag of cone-shaped spring 3, the atmosphere valve is often kept and is opened, pressure reduction between rear epitrochoidal chamber 21 and the front epitrochoidal chamber 17 is maintained, although Input Forces reduces, but the power-assisted of servo-unit does not reduce, and the High power output of servo-unit partly is held, the keep-process of Here it is emergency braking.
3) emergency braking release position
With reference to the accompanying drawings 1,6, the releasing brake pedal, input bar 1 is under the effect of cone-shaped spring 3, drive large plunger 7 mobile backward, moving to atmospheric valve seat boss 7a contacts with vacuum leather cup 6, and the drag that overcomes Compress Spring 5 with the end face top of vacuum leather cup 6 from valve body vacuum valve seat boss 29a, vacuum break valve, rear epitrochoidal chamber 21 communicates with front epitrochoidal chamber 17, servo-unit two epitrochoidal chambers begin pressure release, valve body 29 begins rollback under the effect of big spring 14, at this moment, and large plunger 7 middle parts and locking plate 8 end contacts.Along with valve body 29 continuous rollbacks, when locking plate 8 is run into rear housing 22, locking plate 8 is limited, large plunger 7 and locking plate 8 stop mobile, valve body 29 continues rollbacks at this moment, overcome the drag of sleeve spring 25, locking plate 8 promotes sleeve 26 relative valve bodies 29, valve body cover 24 moves forward, the inclined-plane of sleeve 26 small ends contacts with pin 10, along with valve body 29 continues rollback, the drag that sleeve 26 small end inclined-planes overcome pin spring 23 is pushed up back pin 10 in the radial direction through hole in the valve body cover 24, pin 10 separates with the step of small plunger 9 large ends, the step of small plunger 9 is no longer spacing by pin 10, and small plunger 9 is at reaction plate 16, move backward with large plunger 7 relative to valve body cover 24 under the effect of the feedback force that ratio dish 12 transmits and contacts, emergency braking function is disengaged.When after after pressure reduction between epitrochoidal chamber 21 and the front epitrochoidal chamber 17 thoroughly disappears, valve body vacuum valve seat boss 29a again with vacuum leather cup 6 end contacts, atmosphere valve and vacuum valve are all closed, servo-unit control cock assembly has been got back to again initial condition shown in Figure 2.
Above-mentioned embodiment is used for the present invention that explains; rather than to unique restriction of the present invention; the related variation scheme of carrying out on the basis of technical conceive of the present invention is all in protection scope of the present invention; any use that invention is made is revised and change, all fallen within protection scope of the present invention.
Claims (8)
1. mechanical vacuum booster, comprise front case (18), rear housing (22), control cock assembly, described front case (18) links to each other with described rear housing (22), it is characterized in that, include valve body (29), large plunger (7), ratio dish (12) in the described control cock assembly, be provided with small plunger (9) between described large plunger (7) and the described ratio dish (12), the end of described small plunger (9) is provided with step, is provided with small plunger (9) automatic spacing and decontrol at the operation passage of described small plunger (9).
2. a kind of mechanical vacuum booster according to claim 1, it is characterized in that, described small plunger 9 automatic spacings and decontrol comprise pin (10), pin spring (23), valve body cover (24), sleeve (26), sleeve spring (25), locking plate (8), described valve body cover (24) is arranged in the described valve body (29), be provided with pin (10) in the described valve body cover (24), described pin (10) is spacing by pin spring (23); Described small plunger (9) is sleeved in the described sleeve (26), and described sleeve (26) contacts with described locking plate (8).
3. a kind of mechanical vacuum booster according to claim 1 and 2, it is characterized in that, described control cock assembly also comprises input bar (1), filter screen spring perch (30), inner filter core (2), cone-shaped spring (3), spring perch (4), vacuum valve seat (28), Compress Spring (5), vacuum leather cup (6), ratio dish (12), reaction plate (16), valve body cover (24), circlip (15), take-off lever (13) etc., described large plunger (7) small end cylindrical and sleeve (26) inner circle free-running fit, described large plunger (7) small end end is connected with described small plunger (9) contact, described sleeve (26) is packed in described valve body (29) interstitial hole, described sleeve (26) is spacing by described sleeve spring (25), described sleeve (26) step end end face is contacted with locking plate (8) all the time, and described sleeve (26) small end has the inclined-plane; Described valve body cover (24) is set in described valve body (29) and holds greatly in the counterbore, described valve body cover (24) small end end face and described valve body (29) counterbore end contact, described pin (10) is set in the upper radially-directed hole of described valve body cover (24), and described pin (10) is provided with the inclined-plane near sleeve (26) small end one side.
4. a kind of mechanical vacuum booster according to claim 3, it is characterized in that, in the normal brake application process, described large plunger (7) promotes described small plunger (9) and moves forward together, described sleeve (26) small end is connected with the contact of described pin (10) top always, the described pin (10) that makes remains in the described valve body cover (24), guarantees that power passing ratio dish (12), small plunger (9), the large plunger (7) of feedback passes to input bar (1).
5. a kind of mechanical vacuum booster according to claim 3, it is characterized in that, in the emergency brake operations process, described large plunger (7) promotes the larger distance moving of the relatively described pin of described small plunger (9) (10), step on the described small plunger (9) is crossed described pin (10), and described sleeve (26) is mobile backward under the effect of described sleeve spring (25), make sleeve (26) small end break away from through hole in the valve body cover (24) at described pin (10) place, described pin (10) moves on the cylindrical of small plunger (9) to the center under the effect of described pin spring (23), contact with the step of described small plunger (9), small plunger (9) is carried out spacing, stop small plunger (9) with the plunger rollback.
6. a kind of mechanical vacuum booster according to claim 3, it is characterized in that, in the emergency braking dispose procedure, along with described vacuum valve is return and opened to the relatively described valve body of described large plunger (7) (29), pressure reduction between rear epitrochoidal chamber (21) and the front epitrochoidal chamber (17) rapidly disappears, described valve body (29) is under the effect of return big spring (14), and rollback is to initial position; Described locking plate (8) contacts with described rear housing (22), and by described rear housing (22) thus spacingly be forced to relatively described valve body (29) reach, described locking plate this moment (8) promotes described sleeve (26) return, described sleeve (26) small end inclined-plane contacts with described pin (10) inclined-plane, force described pin (10) to overcome described pin spring (23) power and come back to original position, described small plunger (9) rollback under the effect of reaction plate (16) realizes that emergency braking discharges.
7. according to claim 4 or 5 or 6 described a kind of mechanical vacuum boosters, it is characterized in that, described pin (10) is at ordinary times by the state of small plunger (9) and sleeve (26) support, guarantees that small plunger (9) can be free to slide between pin (10).
8. a kind of mechanical vacuum booster according to claim 7, it is characterized in that, when described small plunger (9) slips over certain displacement and described sleeve (26) after rollback certain displacement under described sleeve spring (25) effect, described pin (10) is ejected by described pin spring (23), blocks the rollback of described small plunger (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210494890.7A CN103010197B (en) | 2012-11-28 | 2012-11-28 | Mechanical vacuum booster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210494890.7A CN103010197B (en) | 2012-11-28 | 2012-11-28 | Mechanical vacuum booster |
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| CN103010197A true CN103010197A (en) | 2013-04-03 |
| CN103010197B CN103010197B (en) | 2015-04-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103419766A (en) * | 2013-08-07 | 2013-12-04 | 京西重工（上海）有限公司 | Vacuum booster reaction rod retaining appliance and reaction rod retaining method |
| CN106794830A (en) * | 2015-03-31 | 2017-05-31 | 株式会社爱德克斯 | Negative pressure type booster |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2000007862A1 (en) * | 1998-08-05 | 2000-02-17 | Lucas Industries Public Limited Company | Vacuum brake booster with mechanical emergency brake application assistance |
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| CN102167025A (en) * | 2011-03-18 | 2011-08-31 | 芜湖伯特利汽车安全***有限公司 | Mechanical vacuum booster for vehicle |
| CN203157981U (en) * | 2012-11-28 | 2013-08-28 | 芜湖伯特利汽车安全***有限公司 | Mechanical vacuum booster |
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2012
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| US6269731B1 (en) * | 1998-04-24 | 2001-08-07 | Robert Bosch Gmbh | Pneumatic-servomotor with force-controlled boosting |
| WO2000007862A1 (en) * | 1998-08-05 | 2000-02-17 | Lucas Industries Public Limited Company | Vacuum brake booster with mechanical emergency brake application assistance |
| DE10010385B4 (en) * | 2000-03-03 | 2005-06-16 | Lucas Varity Gmbh | Vacuum brake booster with improved magnetless emergency brake assistance |
| CN1418159A (en) * | 2000-12-14 | 2003-05-14 | 罗伯特博施有限公司 | Emergency brake booster comprising radial obstacle locking means |
| CN1671586A (en) * | 2002-07-30 | 2005-09-21 | 卢卡斯汽车股份有限公司 | Brake servo unit comprising an emergency brake auxiliary function |
| CN1809485A (en) * | 2003-04-18 | 2006-07-26 | 博世株式会社 | Negative pressure doubling device |
| CN201472361U (en) * | 2009-07-17 | 2010-05-19 | 芜湖伯特利汽车安全***有限公司 | Mechanical vacuum booster with emergency braking function |
| CN102167025A (en) * | 2011-03-18 | 2011-08-31 | 芜湖伯特利汽车安全***有限公司 | Mechanical vacuum booster for vehicle |
| CN203157981U (en) * | 2012-11-28 | 2013-08-28 | 芜湖伯特利汽车安全***有限公司 | Mechanical vacuum booster |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103419766A (en) * | 2013-08-07 | 2013-12-04 | 京西重工（上海）有限公司 | Vacuum booster reaction rod retaining appliance and reaction rod retaining method |
| CN106794830A (en) * | 2015-03-31 | 2017-05-31 | 株式会社爱德克斯 | Negative pressure type booster |
| CN106794830B (en) * | 2015-03-31 | 2019-01-18 | 株式会社爱德克斯 | Negative pressure type booster |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103010197B (en) | 2015-04-22 |
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Address after: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 19 Taishan Road Patentee after: WUHU BOTELI AUTOMOBILE SAFETY SYSTEM CO., LTD. Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 19 Taishan Road Patentee before: Wuhu Bethel Automotive Secure Systems Ltd. |