CN100526134C - Pneumatic booster - Google Patents
Pneumatic booster Download PDFInfo
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- CN100526134C CN100526134C CNB2005101068500A CN200510106850A CN100526134C CN 100526134 C CN100526134 C CN 100526134C CN B2005101068500 A CNB2005101068500 A CN B2005101068500A CN 200510106850 A CN200510106850 A CN 200510106850A CN 100526134 C CN100526134 C CN 100526134C
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- valve body
- negative pressure
- poppet valve
- cylindrical portion
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Abstract
To provide a pneumatic booster capable of achieving a long stroke without causing increase of pedal stepping force. In starting boosting action, a vacuum valve 11A is closed, and a negative pressure passage 71 is disconnected from a valve element back surface side space 70A to be set in a negative pressure state. As an input rod 7 advances to open an atmospheric air valve 10, atmospheric air is introduced to a pressure changing chamber 4 to thrust a power piston 5, while atmospheric air is introduced to the poppet valve element back surface side space 70A, so that a valve element separating and seating part 57 of a poppet valve element 12A receives pressure on the side of the negative pressure passage in a negative pressure state in such a direction as to close a valve seat 73 for negative pressure. Spring force, or ineffective input, necessary for maintaining a vacuum valve 11A closed when the atmospheric air valve 10 is opened can be reduced. Therefore, pedal stepping force need not be increased even when a pedal ratio is lowered as required following achievement of the long stroke.
Description
Technical field
The present invention relates to be used for the Pneumatic booster of motor vehicle braking system.
Background technology
As one of Pneumatic booster example, have device shown in Figure 4 (with reference to patent documentation 1) Pneumatic booster 1 shown in Figure 4 to have: power piston 5, it will be divided into level pressure chamber 3 and transformation chamber 4 in the shell main body 2; Valve system 9, it is disposed in the cylindrical portion 39 with power piston 5 bonded assembly valve bodies 6, with the plunger 8 interlocks action that is connected in input bar 7.Cylindrical portion 39 is inserted logical shell main bodys 2 and to its rear extension.
In addition, the rear area of the atmos-valve 39 in the inner space of cylindrical portion 39 (cylindrical portion space) 37 (calling cylindrical portion space rear area in the following text) 37a Jie is communicated with atmosphere by the peristome of cylindrical portion 39.
Between input bar 7 and valve body 6, be provided with valve spring 15, between the leading section of input bar 7 and poppet valve body 12, be provided with and carry spring 16.
Valve spring 15 will be imported bar 7 with respect to valve body 6 and push to base end side (Fig. 4 right side).Carry spring 16 with the leading section of poppet valve body 12 by being pressed on the plunger 8 (and then be atmosphere with valve seat 20).The same configuration of the center shaft of the center shaft of vacuum valve 11 and atmos-valve 10 (promptly with atmos-valve 10 be configured in coaxial on), and be disposed at the outside (that is, the diameter of vacuum valve 11 than atmos-valve 10 big) of atmos-valve 10.
And this Pneumatic booster 1 is opened atmos-valve 10 and vacuum valve 11 simultaneously at non-action status.Secondly, when depressing and importing bar 7 bonded assembly brake pedals (omitting diagram), opposing valve spring 15 and carry the elastic force etc. of spring 16, input bar 7 advances, utilize advancing of this input bar 7 that atmos-valve 10 is opened, cylindrical portion space rear area 37a and transformation chamber 4 are communicated with, import atmosphere to transformation chamber 4.By importing atmosphere to this transformation chamber 4, between level pressure chamber 3 and transformation chamber 4, produce difference of pressure, Jie by reaction plate 21 will be owing to this difference of pressure in the thrust that produces on the power piston 5 on take-off lever 22, simultaneously, a part that acts on the antagonistic force on the reaction plate 21 is delivered on the input bar 7 from take-off lever 22.
And, follow advancing of input bar 7 to stop and the advancing of power piston 5 (valve body 6), valve body 6 is with respect to input bar 7 specified amount that relatively advances, and thus, atmos-valve 10 is opened, and forms state of equilibrium.
In the time will removing with respect to the legpower of above-mentioned brake pedal, input bar 7 is owing to the elastic force of valve spring 15 retreats, and simultaneously, plunger 8 also retreats.Thus, poppet valve body 12 by being pressed on the valve spring 8, is opened the valve seat (calling the negative pressure valve seat in the following text) 23 of being located at the vacuum valve 11 of valve body 6 inboards, in transformation chamber 4, imported negative pressure, eliminate above-mentioned difference of pressure through negative pressure path 24 and atmosphere path 25.Then, utilize the elastic force of the returning spring 26 in the level pressure chamber 3 that valve body 6 is retreated, power piston 5 is returned to the original position that inserts the step surface 29 in the stop key 27 contact back covers 28 that are formed at the radial direction hole 27a on the valve body 6, meanwhile, plunger 8 also returns to original position, and above-mentioned vacuum valve 11 also cuts out.
One of above-mentioned negative pressure path 24 distolaterally is communicated with level pressure chamber 3, and another distolateral inner peripheral surface opening in cylindrical portion 39 is integrally formed with valve body 6.The peristome of negative pressure path 24 opposite sides (calling negative pressure passage opening portion in the following text) 24a faces the outer circumferential side configuration of poppet valve body 12.The limit portion of reaction plate 21 side directions of the negative pressure passage opening 24a of portion constitutes the negative pressure valve seat 23 of vacuum valve 11, and the outer circumferential side part that makes valve body leave abutting part 12c is left or butt with valve seat 23 with respect to negative pressure.And, utilize space (calling poppet valve body outer circumferential side space in the following text) 70 that cylindrical portion 39 and poppet valve body 12 form to leave abutting part 12c and be connected to negative pressure and be communicated with negative pressure path 24 with under the state of valve seat 23 at valve body.
As mentioned above, when atmos-valve 10 being started do by advancing of input bar 7, to thus, atmos-valve 10 be opened more than or equal to being applied on the input bar 7 by the valve spring 15 and the atmos-valve 10 required power (calling invalid input in the following text) of opening of proposing the given load decisions such as (elastic force) of spring 16.In addition, set valve spring 15 and carry spring 16, make its given load (elastic force) can resist the interior pressure of transformation chamber 4 of the level pressure chamber 3 of negative pressure state or importing negative pressure and the difference of pressure of atmosphere.
Patent documentation 1: the spy opens the 2004-001632 communique
But, recently, in Pneumatic booster, wish long travelization, the long travelization of seeking Pneumatic booster corresponding to the master cylinder that uses simultaneously with Pneumatic booster.And, when Pneumatic booster is sought long travel, not only need to make to maintain good state with respect to the stroke of master cylinder and the relation of amount of pedal operation, also need pedal ratio (ペ ダ Le ratio) is reduced (seeking low pedal ratioization).
But, when seeking to hang down pedal ratio, in the vapour-pressure type pressurizer of existing structure, cause the increase (and then invalid input is increased) of initial pedal force, correspondingly make the pedal operation deterioration and inconvenience.
And, for improving the pedal operation of such deterioration, consider to seek to reduce invalid input.But, the major part of invalid input be as above-mentioned setting with the level pressure chamber of opposing negative pressure state or import the interior pressure of transformation chamber of negative pressure and the valve spring of the difference of pressure of atmosphere and put forward the given load (elastic force) of spring, be not easy suitably to seek the reduction of this invalid input.
Summary of the invention
The present invention In view of the foregoing constitutes, and its purpose is, Pneumatic booster is provided, and can reduce to carry the elastic force of spring, and then can seek the reduction of invalid input.
First aspect present invention provides Pneumatic booster, level pressure chamber and transformation chamber will be divided into by power piston in the shell main body, the cylindrical portion that is connected in the valve body of described power piston is inserted logical described shell main body and to its rear extension, configuration and the valve system that is connected the plunger interlock of importing bar in described valve body, on described valve body, make the described level pressure of distolateral connection chamber, make another distolateral inner peripheral surface be provided as the negative pressure path of negative pressure passage opening portion opening in described cylindrical portion, along with advancing of described input bar, described valve system action, connection atmosphere peristome via described cylindrical portion imports described transformation chamber with atmosphere, between described level pressure chamber and described transformation chamber, produce difference of pressure, utilize this difference of pressure to advance described power piston, it is characterized in that, described negative pressure passage opening portion is towards the base end side opening of described input bar, and described valve system has: the ring-type atmosphere valve seat that is formed at described plunger back-end; Be formed in the mode mode around the described negative pressure passage opening portion of surrounding on the part of circumferencial direction of described cylindrical portion and from the base end side of described cylindrical portion to the outstanding negative pressure valve seat of the front of described cylindrical portion; The poppet valve body, this poppet valve physical efficiency moves, and has and can leave, be connected to described atmosphere and leave abutting part with the valve body that valve seat and described negative pressure dispose with valve seat, and this valve body leaves between the inner peripheral surface of abutting part and described cylindrical portion has the gap; With the valve body of this poppet valve body leave abutting part to be connected to described atmosphere with valve seat and negative pressure with the direction of valve seat pressured carry spring, the valve body of described poppet valve body leaves the abutting part green phase and opens and closes described negative pressure passage opening portion for described negative pressure with the leaving of valve seat, butt, and the periphery of being left abutting part by the described cylindrical portion in the zone, the described poppet valve body back side relative with described negative pressure passage opening portion and poppet valve body rear side space that described poppet valve body surrounds via valve body is communicated with described transformation chamber.
Second aspect present invention provides the vapour-pressure type pressurizer on the basis of first aspect, it is characterized in that, described poppet valve body has: the ring-type poppet valve body base end part that is fixed in the cylindrical portion of described valve body; With poppet valve body base end part bonded assembly tubular pars contractilis roughly, the front of described pars contractilis partly is connected with the internal side diameter that the described valve body of ring-type leaves abutting part.
Third aspect present invention provides the vapour-pressure type pressurizer on the basis of first aspect, it is characterized in that, described poppet valve body has: being situated between keeps body to be fixed on the ring-type poppet valve body base end part of the cylindrical portion of described valve body by being located at this cylindrical portion in-to-in ring-type; One end is connected with poppet valve body base end part, the other end and valve body leave the roughly barrel-contoured pars contractilis of abutting part bonded assembly, leaves between abutting part and the described maintenance body at described valve body and is provided with the described spring of carrying.
Fourth aspect present invention provides Pneumatic booster on the basis of the third aspect, it is characterized in that, the described spring of carrying is located in the described poppet valve body rear side space.
Fifth aspect present invention provides Pneumatic booster on the basis of the third aspect, it is characterized in that, described poppet valve body base end part is embedded in interior all sides of described maintaining part, and the external diameter of described poppet valve body base end part is than the described little path of internal diameter of carrying spring.
Sixth aspect present invention provides Pneumatic booster on the basis of fourth aspect, it is characterized in that, described poppet valve body base end part is embedded in interior all sides of described maintaining part, and the external diameter of described poppet valve body base end part is than the described little path of internal diameter of carrying spring.Seventh aspect present invention provides Pneumatic booster on the basis of any one party face aspect the 3rd～the 6th, it is characterized in that, it is ring-type that described valve body leaves abutting part, and the front of described pars contractilis partly is connected with the internal side diameter that described valve body leaves abutting part.
Invention according to first aspect, when boosting function begins, the negative pressure path forms negative pressure state, and interdict with poppet valve body rear side space, when atmos-valve being opened by advancing of input bar, it is indoor that atmosphere is imported into transformation, between level pressure chamber and transformation chamber, produce difference of pressure, power piston advances, on the other hand, atmosphere is imported to poppet valve body rear side space from described transformation chamber via the periphery that the valve body of poppet valve body leaves abutting part, meanwhile, the valve body of poppet valve body leaves abutting part to the negative pressure passage side, promptly closes negative pressure and uses the direction of valve seat pressured.Therefore, vacuum valve is kept close the needed elastic force of carrying spring of valve state correspondingly to reduce, and then can be reduced invalid input.
According to the invention of second aspect, because the internal side diameter that valve body leaves abutting part that is connected that leaves abutting part with respect to the valve body of pars contractilis front partly carries out, so but broadening poppet valve body rear side space.
According to the invention of the third aspect, to carry spring and be located at valve body and leave between abutting part and the cylindrical portion, the elastic force of carrying spring works as pressing force with valve seat with respect to negative pressure, has the failure-free leak tightness.In addition, owing to the elastic force of carrying spring does not act on the input bar, so can reduce to import the invalid input of bar.
According to the invention of fourth aspect, carry spring owing to be disposed at the rear side space of poppet valve body, so when atmosphere is imported the transformation chamber,, therefore, can reduce the air communication sound not by carrying spring.
According to the invention of the 5th, six aspects, the external diameter of poppet valve body base end part is owing to being the path littler than the internal diameter of carrying spring, so can easily will put forward the rear side that spring inserts the poppet valve body.
According to the invention of the 7th aspect, in the invention aspect the third aspect～6th, owing to the internal side diameter that leaves abutting part at valve body partly carries out the valve body of pars contractilis front is left the connection of abutting part, so but broadening poppet valve body rear side space.
Description of drawings
Fig. 1 is the section-drawing of the Pneumatic booster of pattern ground expression first embodiment of the invention;
Fig. 2 is the partial enlarged drawing of Fig. 1;
Fig. 3 is the front elevation of part that expression contains the valve body negative pressure passage opening portion of Fig. 2;
Fig. 4 is the section-drawing of the existing Pneumatic booster of pattern ground expression.
Nomenclature
The 1A Pneumatic booster
2 shell main bodys
Transformation chambers 4
5 power pistons
6 valve bodies
7 input bars
8 plungers
9 valve systems
10 atmos-valves
The 11A vacuum valve
12A poppet valve body
15 valve springs
16A carries spring
20 atmosphere valve seats
21 reaction plates
39 cylindrical portion
56 pars contractiliss
57 valve bodies leave abutting part
70A poppet valve body rear side space
71 negative pressure paths
72 negative pressure passage opening portions
73 negative pressure valve seats
The specific embodiment
Below, the Pneumatic booster 1A of first embodiment of the invention is described with reference to Fig. 1 and Fig. 2.
Among Fig. 1 and Fig. 2, Pneumatic booster 1A has the shell main body 2 that is made of fore shell 30 and back cover 28, simultaneously, disposes the power piston 5 that its internal separation is become level pressure chamber 3 and transformation chamber 4 in this shell main body 2.Power piston 5 remains in dividing plate 35, and heart portion is provided with the valve body 6 that forms axis hole 36 and cylindrical portion space 37 therein.
The main part (calling the valve body main part in the following text) 38 in big footpath that valve body 6 will form the part in axis hole 36 and cylindrical portion space 37 is connected with the cylindrical portion 39 that is formed with cylindrical portion space 37 most paths, this cylindrical portion 39 air seals and insert the path tube portion 40 at logical back cover 28 rear portions sliding freely and extend to its rear.Cylindrical portion 39 constitutes by the cylindrical portion front part 39A of its peristome (calling the cylindrical portion peristome in the following text) 39a side with the cylindrical portion base end side part 39B of the opposite side of cylindrical portion peristome 39a of cylindrical portion front part 39A.Cylindrical portion base end side part 39B is connected with valve body main part 38.In addition, cylindrical portion base end side part 39B compares with cylindrical portion front part 39A, and gauge increases.
On valve body 6, be provided with one and distolaterally be communicated with, the negative pressure path 71 (level pressure path) of another distolateral inner peripheral surface opening in cylindrical portion 39 with level pressure chamber 3.Negative pressure path 71 another distolateral peristomes (calling negative pressure passage opening portion in the following text) 72 are roughly given prominence to towards cylindrical portion front part 39A from cylindrical portion base end side part 39B tubular, the base end side (right of Fig. 2 towards input bar 7, paper the place ahead of Fig. 3) opening, the valve body that faces the ring-type of poppet valve body 12A leaves abutting part 57 configurations.As shown in Figure 3, negative pressure path 71 forms two, and corresponding to this, negative pressure passage opening portion 72 also is provided with two.The ring-type limit portion of negative pressure passage opening portion 72 is formed with negative pressure with valve seat 73, can make valve body leave abutting part 57 and leave or butt.In other words, valve body leaves abutting part 57 green phases and opens and closes negative pressure passage opening portion 72 for negative pressure with the leaving of valve seat 73, butt.
At this moment, being left space (the calling poppet valve body rear side space in the following text) 70A that cylindrical portion 39, cylindrical portion inner barrel 74 and the poppet valve body 12A in the zone, the back side of abutting part 57 (poppet valve body 52A) surround by the valve body relative with negative pressure passage opening portion 72 is communicated with transformation chamber 4 by atmosphere path 25, on the other hand, leave abutting part 57 at valve body and be connected to negative pressure being communicated with blocking under the state of valve seat 73 and negative pressure path 71.
Chimeric on cylindrical portion front part 39A have an above-mentioned cylindrical portion inner barrel 74.Cylindrical portion inner barrel 74 roughly comprises: cylindrical shell main body 75; With distolateral a connection of cylindrical shell main body 75, than the big cylindrical shell wall thickness 76 of the gauge of cylindrical shell main body 75 (maintaining part of ring-type); In the outstanding formation of the other end side direction radial outside of cylindrical shell main body 75,39a contacts with the cylindrical portion peristome, with respect to cylindrical shell first bead 77 of valve body 6 location uses.
Outer circumferential side in cylindrical shell wall thickness 76 is formed with the endless groove 79 of taking in O ring 78 and being fixed.
Be formed with to outstanding cylindrical shell second bead 80 of radially inner side at the front side of cylindrical shell wall thickness 76 (left of Fig. 2 to), ring-type poppet valve body base end part 55 sealings of the poppet valve body 12A of all sides in the cylindrical shell wall thickness 76 will be embedded in, simultaneously, carry out the anti-avulsion of poppet valve body 12A.
On cylindrical shell second bead 80, be formed with forwards (left of Fig. 2 to) outstanding circular protrusion 81, only with an end card of carrying spring 16A.
In addition, in cylindrical portion 39, dispose and carry back-up ring 82, to push the poppet valve body base end part 55 of poppet valve body 12A from interior all sides.Carry back-up ring 82 poppet valve body base end part 55 is fixed on the above-mentioned cylindrical shell wall thickness 76, simultaneously, card ends valve spring 15.
In addition, valve body 6 is always pressured to rear side (Fig. 1 right side) by the returning spring 26 that is disposed in the level pressure chamber 3, when this Pneumatic booster 1A is failure to actuate, the stop key 27 that inserts radial direction hole 27a is positioned at the original position that contacts with the step surface 29 of path tube portion 40 inboards of back cover 28.
In level pressure chamber 3, import for example driving engine negative pressure by the vent 41 of being located at fore shell 30, this negative pressure is also supplied with to transformation chamber 4 through negative pressure path 71 and atmosphere path 25 by the action of the valve system 9 of input bar 7 interlocks that extend with graphic brake pedal never.
On the other hand, the configuration noise reduction imports atmosphere in the cylindrical portion space 37 by each filter 42,43 with filter 42 and dustproof with filter 43 in the cylindrical portion inner barrel 74 of the cylindrical portion peristome 39a side that is disposed at cylindrical portion 39.This atmosphere supplies in the transformation chamber 4 through atmosphere path 25 by the action of valve system 9.At this, noise reduction constitutes ring-types with filter 42 and the dustproof filter 43 of using, and input bar 7 is inserted the inside diameter of logical these filters 42,43 and extended.In addition, these filters 42,43 are setting-in peristoma portion in the path tube portion 40 of back cover 28, the cylindrical portion 39 by covering valve body 6 and the dedusting protective case 44 that bottom tube-like is arranged of cylindrical portion inner barrel 74 and anti-avulsion.
Above-mentioned valve system 9 has the plunger 8 that slidably is intercalated in freely in the axis hole 36 that forms on valve body main part 38.As shown in Figure 2, insert and be connected with the leading section (ellipsis) of input bar 7 in the rearward end of this plunger 8 (calling plunger input bar connecting portion in the following text) 45 and the hole portion (symbol omissions) in the piston body described later portion 48 of being formed at, this input bar 7 is inserted logical noise reductions with filter 42 and dustproof with filter 43 and extension.Input bar 7 marches forward to the left of Fig. 1 according to depressing of brake pedal, and with its one, plunger 8 also advances.
As shown in Figure 2, valve system 9 has: the ring-type atmosphere valve seat 20 that is formed at plunger 8 rear ends (plunger input bar connecting portion 45); Above-mentioned negative pressure valve seat 73; Can leave, be connected to the poppet valve body 12A that is disposed at (cylindrical portion space 37) in the cylindrical portion 39 on above-mentioned two valve seats 20,73; The valve body of being located at poppet valve body 12A leaves between abutting part 57 and the cylindrical shell wall thickness 76, always will leave abutting part 57 and carry spring 16A to what the direction that is connected to two valve seats 20,73 was pushed.Also as shown in Figure 2, poppet valve 16A is disposed in the poppet valve body rear side space 70A of poppet valve body 12A rear side.
In the valve system 9, leave interior all side parts (symbol omission) formation atmos-valve 10 of abutting part 57 front face side (Fig. 2 left side) with the valve body of valve seat 20 and the poppet valve body 12A that is in contact with it by atmosphere, constitute vacuum valve 11A by negative pressure with the outer circumferential side part (symbol omissions) that the valve body of valve seat 73 and the poppet valve body 12A that is in contact with it leaves abutting part 57 front face side (Fig. 2 left side), and selectively supply atmosphere or negative pressure in above-mentioned transformation chamber 4 corresponding to these atmos-valves 10 or the driving valve of vacuum valve 11A.
Atmos-valve 10 as above constitutes, and carries out the connection blocking of transformation chamber 4 and atmosphere, and vacuum valve 11A as above constitutes, and carries out the connection blocking of level pressure chamber 3 and transformation chamber 4.
At this, the poppet valve body 12A that constitutes valve system 9 is fixing with respect to valve body 6 by carrying back-up ring 82, and the described back-up ring 82 of carrying bears the end of input bar 7 to the pressured valve spring 15 of rear side.The other end of this valve spring 15 is limited to one and is located on the ring portion 66 of input bar 7, and thus, input bar 7 is always pressured to the direction of returning rear side, also interlock of plunger 8 when this moves.The stop key 27 of the radial direction hole 27a of plunger 8 by inserting valve body 6 limits the relative shifting range with respect to valve body 6, when this Pneumatic booster 1A is failure to actuate, as shown in Figure 1, utilize the return terminal of stop key 27 restriction plungers 8, poppet valve body 12A keeps the contact atmosphere with valve seat 20 and the negative pressure valve state that closes with valve seat 73.
On the other hand, dispose the cardinal extremity cap 68 of reaction plate 21 and take-off lever 22 in the front of valve body 6, the front end of the plunger shaft portion 49 of plunger 8 positions slightly with a gap with respect to the back side of reaction plate 21.The leading section of take-off lever 22 is by level pressure chamber 3, and slotting logical front shroud 30, and living connects the piston that omits in the graphic master cylinder.In addition, the cardinal extremity cap 68 of take-off lever 22 and reaction plate 21 are by utilizing the pressured back-up ring 69 that is fixed in valve body 6 front ends of returning spring 26 and anti-avulsion.
The following describes the effect of this Pneumatic booster 1A.
This Pneumatic booster 1A utilizes not only that prominent a plurality of thru-bolts 80 of establishing are installed on the not shown car body in the back of its back cover 28, also utilizes in its front shroud 30 fronts the prominent thru-bolt of establishing 81 will omit graphic master cylinder and engages with this Pneumatic booster 1A.
And, when under this installing condition, depressing brake pedal (not shown), input bar 7 advances, plunger 8 advances, the atmosphere of plunger 8 rear ends separates from poppet valve body 12A with valve seat 20, and atmos-valve 10 is opened, thus, by noise reduction with filter 42 and dustproofly atmosphere is flowed in the valve body 6 with filter 43, this atmosphere further from atmos-valve 10 through in the atmosphere paths importing transformation chambers 4 25.Consequently the level pressure chamber 3 of negative pressure is arranged and imported between the transformation chamber 4 of atmosphere in importing to produce difference of pressure, utilize this difference of pressure to advance the power piston 5 that contains valve body 6, this thrust is exported to the master cylinder side through take-off levers 22 from valve body 6.On the other hand, the part of the antagonistic force that above-mentioned output produces is delivered on the input bar 7 through reaction plate 21 and plunger 8 from take-off lever 22, and thus, the boosting function of rising is exported in the increase of corresponding input.
But in the action of step-up system, valve body 6 and plunger 8 move mutually, be subjected to antagonistic force and both are tilted, and thus, valve body leaves abutting part 57 and is connected to negative pressure and produces dislocation with the position of valve seat 73.When this dislocation produced, valve body leaves abutting part 57 and negative pressure to be reduced with the gas tightness of valve seat 73, therefore, was to keep this gas tightness by the elastic force that spring is carried in enhancing at present.But, in this Pneumatic booster 1A, when boosting function begins, when atmos-valve 10 is opened, constitute the negative pressure path 71 and poppet valve body rear side space 70A blocking of negative pressure state, on the other hand, atmosphere is imported in the poppet valve body rear side space 70A.And by the pressure reduction that negative pressure path 71 and poppet valve body rear side space 70A produce, valve body leaves abutting part 57 and bears negative pressure path 71 sides, promptly closes the pressure of negative pressure with the direction of valve seat 73.Consequently, valve body is left abutting part 57 by being pressed in negative pressure with the change of the power on the valve seat 73 greatly, can keep the above-mentioned gas leak tightness with the amount that the bar pressure that imports rises.Therefore, correspondingly can reduce to close the needed elastic force of carrying spring 16A of vacuum valve 11A, and then can reduce invalid input.That is, the elastic force of carrying spring 16A does not act on the input bar 7, therefore, can reduce to relate to the invalid input of importing bar 7.In addition, when reducing to carry the elastic force of spring 16A, resist this elastic force, the elastic force of the valve spring 15 that returns of input bar 7 also can be reduced.
And, owing to can reduce invalid input like this, so, also can not increase pedal force and finish even carry out the low pedal ratioization of necessity along with long travelization.In other words, can not increase pedal force, seek long travelization (low pedal ratioization meanwhile).
In addition, the front of pars contractilis 56 is owing to partly be connected with internal side diameter that valve body leaves abutting part 57, so but broadening poppet valve body rear side space 70A can guarantee to dispose the space of carrying spring 16A in poppet valve body rear side space 70A.In addition, because the effective radius that reduces pars contractilis 56 compared with the past is pretended the pressure differential area that is used for pars contractilis 56 and is reduced.Correspondingly can reduce the elastic force of valve spring 15 owing to reduce difference force, the result can reduce invalid input.In the present embodiment, spring 16A is carried in configuration in the poppet valve body rear side space 70A that widens like this, leaves 57 configurations of abutting part at cylindrical shell wall thickness 76 and valve body and carries spring 16A.Thus, the elastic force of carrying spring 16A can work as the power of pushing reliably with respect to vacuum valve 11A, and makes leak tightness reliable.In addition, when atmosphere being imported in the transformation chamber 4, not by carrying spring 16A, therefore, it is effective that the air communication sound reduces.
In addition, in the above-described embodiments, constituted the Pneumatic booster 1A of so-called monotype, but the present invention also can be used as the tandem type with two power pistons and constitutes with a power piston 5.
Claims (7)
1, a kind of Pneumatic booster, level pressure chamber and transformation chamber will be divided into by power piston in the shell main body, the cylindrical portion that is connected in the valve body of described power piston is inserted logical described shell main body and to its rear extension, configuration and the valve system that is connected in the plunger interlock of importing bar in described valve body, on described valve body, make the described level pressure of distolateral connection chamber, make another distolateral inner peripheral surface be provided as negative pressure passage opening portion and the negative pressure path of opening in described cylindrical portion, along with advancing of described input bar, described valve system action, peristome via the connection atmosphere of described cylindrical portion imports described transformation chamber with atmosphere, between described level pressure chamber and described transformation chamber, produce difference of pressure, utilize this difference of pressure to advance described power piston, it is characterized in that, described negative pressure passage opening portion is towards the base end side opening of described input bar, and described valve system has: the ring-type atmosphere valve seat that is formed at described plunger back-end; Be formed in the mode around the described negative pressure passage opening portion of surrounding on the part of circumferencial direction of described cylindrical portion and from the base end side of described cylindrical portion to the outstanding negative pressure valve seat of the front of described cylindrical portion; The poppet valve body, this poppet valve physical efficiency moves, and has and can leave, be connected to described atmosphere and leave abutting part with the valve body that valve seat and described negative pressure dispose with valve seat, and this valve body leaves between the inner peripheral surface of abutting part and described cylindrical portion has the gap; With the valve body of this poppet valve body leave abutting part to be connected to described atmosphere with valve seat and negative pressure with the direction on the valve seat pressured carry spring, the valve body of described poppet valve body leaves the abutting part green phase and opens and closes described negative pressure passage opening portion for described negative pressure with the leaving of valve seat, butt, and the periphery of being left abutting part by the described cylindrical portion in the zone, the described poppet valve body back side relative with described negative pressure passage opening portion and poppet valve body rear side space that described poppet valve body surrounds via valve body is communicated with described transformation chamber.
2, Pneumatic booster as claimed in claim 1 is characterized in that, described poppet valve body has: the ring-type poppet valve body base end part that is fixed in the cylindrical portion of described valve body; With poppet valve body base end part bonded assembly tubular pars contractilis roughly, the front of described pars contractilis partly is connected with the internal side diameter that the described valve body of ring-type leaves abutting part.
3, Pneumatic booster as claimed in claim 1 is characterized in that, described poppet valve body has: being situated between keeps body to be fixed on the ring-type poppet valve body base end part of the cylindrical portion of described valve body by being located at this cylindrical portion in-to-in ring-type; One end is connected with poppet valve body base end part, the other end and valve body leave the roughly barrel-contoured pars contractilis of abutting part bonded assembly, leaves between abutting part and the described maintenance body at described valve body and is provided with the described spring of carrying.
4, Pneumatic booster as claimed in claim 3 is characterized in that, the described spring of carrying is located in the described poppet valve body rear side space.
5, Pneumatic booster as claimed in claim 3 is characterized in that, described poppet valve body base end part is embedded in interior all sides of described maintaining part, and the external diameter of described poppet valve body base end part is than the described little path of internal diameter of carrying spring.
6, Pneumatic booster as claimed in claim 4 is characterized in that, described poppet valve body base end part is embedded in interior all sides of described maintaining part, and the external diameter of described poppet valve body base end part is than the described little path of internal diameter of carrying spring.
As each described Pneumatic booster in the claim 3～6, it is characterized in that 7, it is ring-type that described valve body leaves abutting part, the front of described pars contractilis partly is connected with the internal side diameter that described valve body leaves abutting part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP277083/04 | 2004-09-24 | ||
| JP2004277083A JP2006088887A (en) | 2004-09-24 | 2004-09-24 | Pneumatic booster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1751926A CN1751926A (en) | 2006-03-29 |
| CN100526134C true CN100526134C (en) | 2009-08-12 |
Family
ID=36230266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101068500A Expired - Fee Related CN100526134C (en) | 2004-09-24 | 2005-09-26 | Pneumatic booster |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006088887A (en) |
| CN (1) | CN100526134C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7038609B2 (en) * | 2018-06-19 | 2022-03-18 | ボッシュ株式会社 | Negative pressure type brake booster |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2587956B1 (en) * | 1985-09-30 | 1987-12-24 | Bendix France | BRAKE ASSIST MOTOR |
| JP2902844B2 (en) * | 1991-12-27 | 1999-06-07 | トキコ株式会社 | Pneumatic booster |
| DE4227879A1 (en) * | 1992-08-22 | 1994-02-24 | Teves Gmbh Alfred | Vacuum brake booster for motor vehicles |
| FR2724355B1 (en) * | 1994-09-08 | 1996-10-31 | Alliedsignal Europ Services | PNEUMATIC LOADED AND REDUCED HYSTERESIS SERVOMOTOR |
| FR2735086B1 (en) * | 1995-06-08 | 1998-01-30 | Alliedsignal Europ Services | SERVOMOTOR WITH SIMPLIFIED COMPENSATION VOLUME |
| JP3854064B2 (en) * | 2000-12-20 | 2006-12-06 | 日信工業株式会社 | Negative pressure booster |
| JP3741646B2 (en) * | 2001-12-27 | 2006-02-01 | ボッシュ株式会社 | Negative pressure booster |
-
2004
- 2004-09-24 JP JP2004277083A patent/JP2006088887A/en active Pending
-
2005
- 2005-09-26 CN CNB2005101068500A patent/CN100526134C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1751926A (en) | 2006-03-29 |
| JP2006088887A (en) | 2006-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090812 Termination date: 20110926 |