CN202320270U - Booster with emergency braking function - Google Patents
Booster with emergency braking function Download PDFInfo
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- CN202320270U CN202320270U CN2011204850844U CN201120485084U CN202320270U CN 202320270 U CN202320270 U CN 202320270U CN 2011204850844 U CN2011204850844 U CN 2011204850844U CN 201120485084 U CN201120485084 U CN 201120485084U CN 202320270 U CN202320270 U CN 202320270U
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- sliding bush
- bush apparatus
- slide block
- valve seat
- piston shell
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Abstract
The utility model provides a booster with an emergency braking function, belonging to the technical field of vacuum boosters for auto braking. By application of a sliding block and a sliding sleeve, the conventional braking function is achieved; and in the case of a small pedaling force and if only a certain speed is maintained so that a pedal is pressed down quickly, the braking force can be improved greatly, an automobile can obtain the maximum braking deceleration in the shortest time and the braking effect of the booster is quicker than that of the conventional booster. The technology disclosed by the utility model can be widely applied to auto braking boosters.
Description
Technical field
The utility model relates to a kind of vacuum booster of automobile brake, specifically, relates to a kind of vacuum booster with emergency braking function.
Background technology
Vacuum booster is a kind of vacuum servo actuating device, is used with the brake equipment of automobile.Its principle of work is when trampling brake pedal; Promoting the input bar makes valve bucket move forward; Make atmospheric valve seat separate, allow atmosphere to get into atmosphere chamber, and piston moves forward owing to the difference of pressure between vacuum chamber and the atmosphere chamber from the external world from atmos-valve; Promote master cylinder piston, make automobile brake thereby in master cylinder, produce power output.In traditional vacuum booster; Servo-unit carries out linear amplification to the power of input by certain ratio; Thereby when emergency takes place; Traditional servo-unit can not obtain bigger braking force at short notice, and vehicle can not obtain maximum braking deceleration power and reach more sensitive braking and shorter stopping distance.Make vehicle in case of emergency can't in time stop, cause potential safety hazard.
To the problems referred to above; People research and develop, and have proposed all improvement projects, like the disclosed a kind of brake servo unit of Chinese patent CN:02118410.0; In this brake servo unit; On the piston shell, form one first vacuum valve seat, and on tube element, form second vacuum valve seat, tube element is installed on the piston shell slidably.Between tube element and valve plunger, be provided with a lever; When valve plunger surpassed certain given value with respect to the shift motion of piston shell, lever generation angular transposition promoted tube element and moves after with respect to the piston shell; And tube element remained on certain position; Aperture when making the aperture of atmos-valve, thereby power output that can an increase of snatch greater than conventional brake, thus make vehicle obtain maximum braking deceleration power.
But; There is a problem in technique scheme, and power required when making lever generation angular transposition is bigger, for weak or women driver; Be difficult for moment through jamming on rapidly of pedal reached; Therefore still can't, emergency, still have potential safety hazard when taking place rapidly with car brakeing.
The utility model content
To the problems referred to above, the utility model provides a kind of servo-unit with emergency braking function, and this servo-unit not only can reach the braking effect under the normal circumstances; And in case of emergency; Application through slide block and sliding sleeve; Under the less situation of treadle effort, as long as can keep certain speed that brake pedal is pressed down fast, just can significantly improve braking force; Make vehicle obtain maximum braking deceleration at short notice, obtain more conventional servo-unit and brake more rapidly.
The utility model is realized through following technological means: a kind of servo-unit with emergency braking function, comprise a piston shell, and it is slidably mounted in the housing; An outer rim tightly is encapsulated in the diaphragm of housing, a lamina membranacea that cooperates with diaphragm, and said piston shell, lamina membranacea and diaphragm are divided into former and later two chambeies with servo-unit inside, and ante-chamber is a vacuum chamber, and back cavity is an atmosphere chamber; A control cock mechanism that is positioned at said piston shell, it is used for realizing the control that delivers gas to said atmosphere chamber or gas is discharged from said atmosphere chamber; One is used for joystick that said control cock mechanism is operated;
Said control cock mechanism comprises: a stop base that is connected with said joystick forms an atmospheric valve seat on it; First vacuum valve seat that on said piston shell, forms; And a valve circle assembly, but its seating on the said atmospheric valve seat and first vacuum valve seat, said atmospheric valve seat and valve circle always are shaped as the atmos-valve mouth, said first vacuum valve seat and valve circle always are shaped as the first vacuum valve port; Also be provided with an annular tube shaped convexity on axially in the said piston shell, said stop base is installed in this annular tube shaped convexity;
Comprise that also is slidably mounted on the outer tubulose sliding bush apparatus of annular tube shaped convexity in the said piston shell; Said sliding bush apparatus tail end form with the first vacuum valve seat radially adjoining and and second vacuum valve seat put, said second vacuum valve seat and valve circle always are shaped as the second vacuum valve port;
A stop motion mechanism, it is used under non-emergent braking situation, said sliding bush apparatus being remained on the position with respect to piston shell forward position;
A returning device, it is used for when said joystick turns back to non-braking position, makes said sliding bush apparatus turn back to non-emergent braking position;
During emergency braking, when said joystick from non-braking position certain given stroke that moves forward, promote stop motion mechanism and slide; Change the arrested state of said sliding bush apparatus; Sliding bush apparatus is retreated with respect to said piston shell, thereby made said valve circle assembly seating on second vacuum valve seat, the vacuum valve port is closed; And atmospheric valve seat and valve circle assembly break away from, and the aperture of atmosphere valve port is greater than the aperture in the conventional brake process;
The utility model also can be done following improvement:
Said sliding bush apparatus is provided with boss three, also is provided with the sliding sleeve pull back spring one on the muscle that two ends are resisted against said boss front end face and piston inner surface of outer cover projection respectively, and this sliding sleeve pull back spring one makes sliding bush apparatus possess the relative piston shell power of displacement backward; Said sliding bush apparatus is directly upwards offered hole one, and hole one front end is provided with two-stage notch cuttype boss, and boss one radial height in next-door neighbour hole one is less than the radial height of boss two; Said stop base front end is pre-small post-large taper shape; Said stop motion mechanism is a T type slide block, and its small end passes the hole one of sliding bush apparatus, with the circular cone inclined-plane free-running fit of stop base front end; During conventional brake, the big end of slide block is resisted against on the plane of sliding bush apparatus boss one, and the restriction sliding bush apparatus is with respect to the displacement backward of piston shell; During emergency braking; Because the stop base stroke of displacement forward surpasses the gap on slide block small end and stop base front end circular cone inclined-plane, stop base front end circular cone pushed slide block small end makes the big end of slide block also to bottom offset to bottom offset; The boss plane that breaks away from sliding bush apparatus; This moment, sliding bush apparatus slided backward under the effect of sliding sleeve pull back spring one, was resisted against on the big end of slide block to the plane of sliding bush apparatus boss two, and said sliding bush apparatus promotes the displacement backward of the valve relative piston shell of circle assembly; Atmospheric valve seat and valve circle assembly are broken away from, and the aperture of atmosphere valve port is greater than the aperture in the conventional brake process.
Also include key, said sliding bush apparatus is directly upwards also offered hole two, and said key is shaft-like, and the one of which end is resisted against inner walls, and the other end passes hole two, leans the displacement backward of restriction stop base with the flange face of stop front end of base.
The lower surface of the big end of said slide block is provided with two open slots; Said returning device is the slide block jump ring of open circles annular; The annular section of said slide block jump ring is installed on the piston shell, and the two ends of opening are stuck in two open slots of the big end of slide block lower surface; Slide block is done flexible fastening; During conventional brake, the big end of this slide block is stuck on the plane of sliding bush apparatus boss one, after emergency braking finished, sliding bush apparatus was got back to the normal brake application position under the effect of pull back spring two and key, and the slide block jump ring makes slide block be moved upward to non-emergent braking position.
Said sliding bush apparatus outside face is provided with groove two vertically, cooperates with the muscle of piston inner surface of outer cover projection, guarantees that sliding sleeve is in the forefront of relative piston shell.
Said sliding bush apparatus rear end is provided with annular groove one, is equipped with in this annular groove one and piston inner surface of outer cover leak free seal ring.
Compared with prior art, the beneficial effect that the utlity model has is:
1) a kind of servo-unit with emergency braking function of the utility model not only can reach conventional braking effect; And in case of emergency; Application through slide block and sliding sleeve; Under the less situation of treadle effort, as long as can keep certain speed that brake pedal is pressed down fast, just can significantly improve braking force; Make vehicle obtain maximum braking deceleration at short notice, obtain more conventional servo-unit and brake more rapidly.
2) a kind of servo-unit with emergency braking function of the utility model realizes that the block construction of emergency braking function is simple, need not complicated circuitry or electric elements, can guarantee realization emergency braking steady in a long-term, and it is low to have a cost, convenient installation.
Description of drawings
Fig. 1 is the servo-unit cutaway view of the utility model;
Fig. 2 is the partial enlarged drawing of Fig. 1;
Fig. 3 is slide block and slide block jump ring assembling scheme drawing;
Fig. 4 is the sliding bush apparatus structural representation;
Fig. 5 is the servo-unit conventional brake operation schematic sectional view of the utility model;
Fig. 6 is the servo-unit emergency brake operations schematic sectional view of the utility model;
Fig. 7 is the servo-unit input-output response curve figure of the utility model;
Among the figure: 1. slide block jump ring; 2. sliding bush apparatus; 2a. annular groove one; 2b. boss three; 2c. hole two; 2d. boss one; 2d1. the plane of boss one; 2e. boss two; 2e1. the plane of boss two; 2f. hole one; 2g. groove two; 3. back cover seal ring; 4. stop base; 4a. flange face; 4b. circular cone inclined-plane; 5. seal ring; 6. dust boot; 7. piston shell; 7a. annular protrusion; 7a1. groove two; 7a2. inner bottom surface; 7b. through hole; 7c. inner peripheral surface; 8. valve coil spring; 9. valve bowl seal ring; 10. filter sponge; 11. joystick; 12. nut; 13. jaw; 14. support spring; 15. valve bowl; 15a. periphery; 16. valve circle assembly; 17. sliding sleeve pull back spring one; 18. key; 19. slide block; 19a. small end; 19b. big end; 19c. open slot; 20. pressure dish; 21. connection-peg; 22. adjusting lever; 23. reaction plate; 24. ratio dish; 25. atmosphere chamber; 26. vacuum chamber; 27. plug; 28. vacuum adapter seal ring; 29. fore shell interface; 30. pull back spring two; 31. fore shell; 32. lamina membranacea; 33. diaphragm; 34. back cover; 34a. inwall; 35. locking plate; 36. adjust bar assembly; 37. control cock mechanism; 38. annular tube shaped convexity; 39. valve circle; 40. dummy slider; 41. piston shell internal channel; 42. variable pressure passage; 42a. access portal one; 42b. access portal two; 43. lever assembly; 44. muscle; S1. first vacuum valve seat; S2. second vacuum valve seat; S3. atmospheric valve seat; K1. the first vacuum valve port; K2. atmosphere valve port; K3. the second vacuum valve port;
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified, but the utility model is not caused any restriction.
Like Fig. 1, shown in Figure 2, a kind of servo-unit with emergency braking function comprises back cover 34, fore shell 31, and a piston shell 7 is installed in rear housing slidably.At the back cover oral area back cover seal ring 3 of an annular is installed, the peripheral formation with back cover 34 of piston shell sealed.Comprise that also an outer rim tightly is encapsulated in the diaphragm 33 of housing; A lamina membranacea 32 that cooperates with diaphragm 33; Lamina membranacea 32, diaphragm 33 are connected the periphery of piston shell 7, and through locking plate 35 diaphragm, lamina membranacea riveting are fixed on the piston shell, and said piston shell, lamina membranacea 32 and diaphragm 33 are divided into former and later two chambeies with servo-unit inside; Ante-chamber is a vacuum chamber 26, and back cavity is an atmosphere chamber 25; Fore shell 31 is through diaphragm 33 outer rims and back cover 34 riveted joint sealings; Master cylinder assembly (not shown) is connected sealing with fore shell interface 29 places; The master brake cylinder first piston is connected with vacuum booster adjust bar assembly 36, transmits power output through brake master cylinder assembly; Said adjust bar assembly is made up of adjust bar 22 and connection-peg 21.
Vacuum check valve (not shown) of assembling is introduced negative pressure from this vacuum check valve at fore shell 31 vacuum adapter seal rings 28 places.Vacuum valve seals circle mouth is blocked with plug 27 and is avoided getting into foreign material.Pull back spring 2 30 is assemblied in the vacuum chamber 26, and the one of which end is against the fore shell inwall, other end abuts against plunger shell 7, pull back spring 2 30 is oppressed piston shell 7 backward, key 18 spacing down, remain on the non-braking position shown in Figure 1.
Said piston shell 7 front ends are provided with annular protrusion 7a vertically, form groove two 7a1 in this annular protrusion 7a, in the groove by after reaction plate 23, adjusting lever 22 are installed forward successively.Said adjusting lever 22 front end faces have a blind hole, are used for fixing connection-peg 21, and connection-peg 21 connects brake master cylinder assembly first piston (not shown on the figure) and carries out the power output transmission.At pull back spring 2 30, press under the effect of dish 20, guarantee that above-mentioned part is connected with piston shell 7 not come off.The center also is provided with a through hole 7b in groove two 7a1, and its point diameter is big, cooperates with the ratio dish, and in order to place ratio dish 24, the rear end diameter is little, cooperates with stop base 4 front ends, is used to place stop base 4 front ends.When servo-unit is activated, the brake response power that acts on adjust bar assembly 36 through reaction plate 23, ratio dish 24, stop base 4, and joystick 11 reach on the brake pedal (not shown).
When said brake master cylinder assembly (not shown) and the assembling of servo-unit assembly; Under doing of master brake cylinder predetermincd tension used; First piston begins to oppress adjust bar assembly 36; Adjust bar assembly 36 is with respect to piston shell 7 displacement backward, forces reaction plate 23 compressions and forms sealing with the inner bottom surface 7a2 of groove two 7a1.
Be provided with a control cock mechanism 37 in the piston shell, it is used for realizing the control that delivers gas to said atmosphere chamber or gas is discharged from said atmosphere chamber; Atmosphere chamber 25 and two chamber pressure reduction of vacuum chamber 26 are changed under unbalance and balance two states.
Said control cock mechanism 37 comprises: a stop base 4 that is connected with said joystick 11 forms an atmospheric valve seat S3 on it; A first vacuum valve seat S1 who on said piston shell 7, forms; And one be assemblied in joystick 11 axially on valve circle assembly 16, by being provided with valve coil spring 8, valve bowl 15, support spring 14 behind the forward direction successively and filtering sponge 10, said filtration sponge 10 is assemblied in the flange aft end face of joystick 11 thereafter; Said valve bowl 15 front end periphery 15a and the sealing of valve circle assembly 16 inner headed faces; Said valve bowl 15 rear end peripheries are provided with boss, and valve bowl seal ring 9 is housed on this boss, form sealing with piston shell 7 aft end faces.Said valve coil spring 8 one ends are against valve circle assembly 16, and the other end is against valve bowl 15 outer walls; Said support spring 14 1 ends are against the flange front end face of joystick 11, and the other end is against valve bowl 15 front inner wall.
The bulb of joystick 11 partly is riveted in the groove of stop base 4, makes to possess 8 compressions of valve coil spring one and make valve circle assembly 16 relative piston shell 7 proal power; Support spring 14 compelled compressions possess the power that joystick 11 and stop base 4 relative piston shells 7 are moved backward; So just make valve circle assembly 16 be resisted against on the first vacuum valve seat S1, the atmospheric valve seat S3 from rear side; Said atmospheric valve seat S3 and valve circle assembly 16 form atmosphere valve port K2, and said atmosphere valve port K2 is connected with the interior variable pressure passage 42 of piston shell, when atmosphere valve port K2 opens, and vacuum booster atmosphere chamber 25 and atmosphere.Said variable pressure passage 42 has access portal one 42a, access portal two 42b on piston shell 7.
Said first vacuum valve seat S1 and valve circle assembly 16 form the first vacuum valve port K1; The said first vacuum valve port K1 is connected with piston shell internal channel 41, and when the first vacuum valve port K1 opened, vacuum booster vacuum chamber 26 was connected with atmosphere chamber 25.Said valve circle assembly 16 is made up of valve circle 39 and dummy slider 40, and said dummy slider 40 is set in valve circle 39 inside valve is enclosed supporting role;
Also be provided with on axially in the said piston shell 7 one annular tube shaped protruding 38, said stop base 4 is installed on this in annular tube shaped protruding 38; Comprise that also is slidably mounted in the said piston shell 7 annular tube shaped protruding 38 outer tubulose sliding bush apparatus 2; Said sliding bush apparatus 2 tail ends form with the first vacuum valve seat S1 radially adjoining and and the second vacuum valve seat S2 that puts, said second vacuum valve seat S2 and the valve circle assembly 16 formation second vacuum valve port K3;
Said sliding bush apparatus 2 rear ends are provided with annular groove one 2a, are equipped with in this annular groove one 2a and piston inner surface of outer cover leak free seal ring 5.The first vacuum valve port K1 and the second vacuum valve port K3 keep sealing under the effect of seal ring 5.
Said sliding bush apparatus 2 is provided with boss three 2b; Also be provided with the sliding sleeve pull back spring 1 on the muscle 44 that two ends are resisted against said boss 2b front end face and piston inner surface of outer cover projection respectively, this sliding sleeve pull back spring 1 makes sliding bush apparatus 2 possess relative piston shell 7 power of displacement backward.
Hole one 2f is upwards offered in said sliding bush apparatus 2 footpaths, and hole one 2f front end is provided with two-stage notch cuttype boss, and the boss one 2d radial height of next-door neighbour hole one 2f is less than the radial height of boss two 2e; Said stop base 4 front ends are pre-small post-large taper shape;
Also comprise a stop motion mechanism, it is used under non-emergent braking situation, said sliding bush apparatus 2 being remained on the position with respect to piston shell 7 forward positions; Said stop motion mechanism is a T type slide block 19, and its small end 19a passes hole one 2f of sliding bush apparatus 2, with the circular cone inclined-plane free-running fit of stop base 4 front ends; During conventional brake, the big end 19b of slide block is resisted against on the plane 2d1 of sliding bush apparatus 2 boss one, and restriction sliding bush apparatus 2 is with respect to the displacement backward of piston shell; During emergency braking; Because stop base 4 stroke of displacement forward surpasses the gap on slide block small end 19a and stop base 4 front end circular cone inclined-planes, stop base 4 front end circular cone pushed slide block small end 19a make the big end 19b of slide block also to side travel to side travel; The boss plane 2d1 that breaks away from sliding bush apparatus 2; This moment, sliding bush apparatus 2 slided backward under the effect of sliding sleeve pull back spring 1, was resisted against on the big end 19b of slide block to the plane 2e1 of sliding bush apparatus 2 boss two, and said sliding bush apparatus 2 promotes the 16 relative piston shell displacements backward of valve circle assemblies; Atmospheric valve seat S3 and valve circle assembly 16 are broken away from, and the aperture of atmosphere valve port K2 is greater than the aperture in the conventional brake process.
Also include key 18, hole two 2c are upwards also offered in said sliding bush apparatus 2 footpaths, and said key 18 is shaft-like; The one of which end is resisted against inner walls 34a; The other end passes hole two 2c, leans the displacement backward of restriction stop base with the flange face 4a of stop front end of base.
Also comprise a returning device, it is used for when said joystick 11 turns back to non-braking position, makes said sliding bush apparatus 2 turn back to non-emergent braking position; The lower surface of the big end 19b of slide block 19 is provided with two open slot 19c; Said returning device is the slide block jump ring 1 of open circles annular; The annular section of said slide block jump ring 1 is installed on the piston shell 7, and the two ends of opening are stuck in two open slot 19c of the big end 19b of slide block lower surface; Slide block is done flexible fastening; During conventional brake; The big end 19b of this slide block is stuck on the plane 2d1 of sliding bush apparatus 2 boss one; After emergency braking finished, sliding bush apparatus 2 was got back to the normal brake application position under the effect of pull back spring two (30) and key 18, and slide block jump ring 1 makes slide block be moved upward to non-emergent braking position.
Said sliding bush apparatus 2 outside faces are provided with groove two 2g vertically, cooperate with the muscle 44 of piston inner surface of outer cover projection, guarantee that sliding sleeve is in the forefront of relative piston shell.
Said sliding bush apparatus 2 rear ends are provided with annular groove one 2a, are equipped with in this annular groove one 2a and piston inner surface of outer cover leak free seal ring 5.
During emergency braking, when said joystick 11 from non-braking position certain given stroke that moves forward, promote stop motion mechanism and slide; Change the arrested state of said sliding bush apparatus 2; Sliding bush apparatus 2 is retreated with respect to said piston shell 7, thereby made said valve circle assembly 16 seatings on the second vacuum valve seat S2, vacuum valve port K3 closes; And atmospheric valve seat S3 and valve circle assembly 16 break away from, and the aperture of atmosphere valve port K2 is greater than the aperture in the conventional brake process;
Like Fig. 1, Fig. 2 and shown in Figure 3, during assembling, compressing lever assembly 43 makes stop base 4 displacement forward, and said lever assembly is made up of joystick 11, stop base 4, nut 12, jaw 13; Pack variable pressure access portal one 42a of key 18 from the piston shell this moment into; Through a radial opening 2c on sliding sleeve 2 rear ends; Flange face 4a with the stop front end of base leans then; The motion backward under pull back spring 30 compressings of piston shell 7 this moment, key 18 1 ends are resisted against the inwall boss 34a place of back cover 34 opening parts, and key 18 is resisted against on the front end face of variable pressure access portal one 42a.And because the displacement of key 18 drives sliding bush apparatus 2 displacement forward; Make that the front end face of boss face 2d1 variable ratio pressure channel opening two 42b of sliding bush apparatus 2 front ends is more forward; This moment, slide block 19 was come in from variable pressure access portal two 42b assembling; Two step 2d of sliding bush apparatus 2 front ends are being resisted against under the effect of sliding sleeve pull back spring 17 on the slide block plane domain 19b, and sliding bush apparatus 2 keeps being in relative piston shell 7 foremost.
When engine starting, import a negative pressure to booster vacuum chamber 25 through vacuum hose.Because atmosphere communicates with back cavity 25, has just formed pressure reduction between ante-chamber 26 and the back cavity 25.Under the effect of atmosphere, diaphragm 33, lamina membranacea 32 promote piston shell 7 and travel forward, stop base 4, joystick 11, support spring 14 relative piston shell displacements backward, and atmosphere valve port K2 closes.This moment, the servo-unit front/back cavity reached a servo balance state, when driving engine stops, stepping on brake pedal, and enough braking force output is arranged.
The servo-unit conventional brake process of the utility model is following: the brake pedal (not shown) is when normal operation; Step on brake pedal; Joystick 11, stop base 4 relative piston shells 7 are subjected to displacement forward, and atmosphere valve port K2 opens, and atmosphere gets into atmosphere chamber 25.Vacuum chamber 26 and atmosphere chamber 25 make diaphragm 33, lamina membranacea 32 drive 7 displacements forward of piston shells under the atm difference effect.Under the predetermincd tension effect of master brake cylinder (not shown), adjust bar assembly 36 produces a plugging power and begins compressed feedback dish 23.Reaction plate 23 is reversed compression and is resisted against on the ratio dish 24, and plugging power passing ratio dish 24, stop base 4, lever assembly 43 are delivered on the brake pedal, begins braking.Time point before the brake response representes that by the JP1 that uprushes shown in Fig. 6 brake response is delivered on the brake pedal that does not draw through stop base 4, joystick 11.Subsequently, output is risen than SR1 with certain power-assisted.
The servo-unit emergency braking process of the utility model is following: when brake pedal with certain speed, press down in the operating process of carrying out emergency braking stop base 4 displacement forward under the quick promotion of lever assembly 43 fast.Compare with normal brake application, stop base 4 increases with respect to the displacement of piston shell 7 to some extent, so stop base 4 front end tapered slope promotion slide block 19 makes the big end 19b of slide block break away from the boss plane 2d1 of sliding bush apparatus 2, release sliding bush apparatus 2 to sideway movement.Sliding bush apparatus 2 under the effect of sliding sleeve pull back spring 1, with respect to piston shell 7 backward displacement be resisted against on the valve circle assembly 16, make atmosphere valve port K2 opening degree greater than the aperture that in the normal brake application process, occurs.Atmosphere is introduced atmosphere chamber 25 rapidly, makes brake servo unit produce the output that an amplitude increases rapidly.When servo-unit reached the servo balance state, atmosphere valve port K2 closed, and stop base 4, joystick 11 displacement backward increase.
As stated, in the emergency brake operations process.The amount of uprushing of power output will be greater than normal brake application operating period, shown in Fig. 6 mid point JP2.When it reached the servo balance state, brake response was delivered to brake pedal through stop base 4, joystick 11.Subsequently, output is risen than SR2 with certain power-assisted.
When end of braking, atmosphere valve port K2 closes, and the first vacuum valve port K1 opens; Piston shell 7 begins return under pull back spring 2 30 and two chamber pressure differential effects; Piston shell 7 integral body move backward, and key 18 does not move because an end is resisted against the inwall boss 34a place of back cover 34 opening parts; So piston shell 7 moves forward relatively; Sliding sleeve 2 is got back to the normal brake application position under the effect of key 18, slide block 19 this moment return under the effect of slide block jump ring 1 makes sliding sleeve 2 remain on conventional braking mode position.
The above embodiments are merely the preferred embodiment of the utility model, can not limit the interest field of the utility model with this, and therefore, the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (6)
1. the servo-unit with emergency braking function comprises a piston shell (7), and it is slidably mounted in the housing;
An outer rim tightly is encapsulated in the diaphragm (33) of housing, a lamina membranacea (32) that cooperates with diaphragm (33), and said piston shell, lamina membranacea (32) and diaphragm (33) are divided into former and later two chambeies with servo-unit inside, and ante-chamber is a vacuum chamber, and back cavity is an atmosphere chamber; A control cock mechanism (37) that is positioned at said piston shell (7), it is used for realizing the control that delivers gas to said atmosphere chamber or gas is discharged from said atmosphere chamber; One is used for joystick (11) that said control cock mechanism (37) is operated;
Said control cock mechanism (37) comprising: a stop base (4) that is connected with said joystick (11) forms an atmospheric valve seat (S3) on it; First vacuum valve seat (S1) of going up formation at said piston shell (7); An and valve circle assembly (16); But its seating is on said atmospheric valve seat (S3) and first vacuum valve seat (S1); Said atmospheric valve seat (S3) and valve circle assembly (16) form atmosphere valve port (K2), and said first vacuum valve seat (S1) and valve circle assembly (16) form the first vacuum valve port (K1); Also be provided with an annular tube shaped convexity (38) on axially in the said piston shell (7), said stop base (4) is installed in this annular tube shaped convexity (38);
It is characterized in that: comprise that also is slidably mounted on the outer tubulose sliding bush apparatus (2) of annular tube shaped convexity (38) in the said piston shell (7); Said sliding bush apparatus (2) tail end form with first vacuum valve seat (S1) radially adjoining and and second vacuum valve seat (S2) put, said second vacuum valve seat (S2) forms the second vacuum valve port (K3) with valve circle assembly (16); A stop motion mechanism, it is used under non-emergent braking situation, said sliding bush apparatus (2) being remained on the position with respect to piston shell (7) forward position;
A returning device, it is used for making said sliding bush apparatus (2) turn back to non-emergent braking position when said joystick (11) when turning back to non-braking position;
During emergency braking, when said joystick (11) from non-braking position certain given stroke that moves forward, promote stop motion mechanism and slide; Change the arrested state of said sliding bush apparatus (2); Sliding bush apparatus (2) is retreated with respect to said piston shell, thereby made said valve circle assembly (16) seating on second vacuum valve seat (S2), vacuum valve port (K3) is closed; And atmospheric valve seat (S3) breaks away from valve circle assembly (16), and the aperture of atmosphere valve port (K2) is greater than the aperture in the conventional brake process.
2. a kind of servo-unit according to claim 1 with emergency braking function; It is characterized in that: said sliding bush apparatus (2) is provided with boss (2b), also is provided with the sliding sleeve pull back spring one (17) on the muscle (43,44) that two ends are resisted against said boss (2b) front end face and piston inner surface of outer cover projection respectively; Hole one (2f) is upwards offered in said sliding bush apparatus (2) footpath, and hole one (2f) front end is provided with two-stage notch cuttype boss, and boss one (2d) radial height in next-door neighbour hole one (2f) is less than the radial height of boss two (2e); Said stop base (4) front end is pre-small post-large taper shape; Said stop motion mechanism is a T type slide block (19), and its small end (19a) passes the hole one (2f) of sliding bush apparatus (2), with the circular cone inclined-plane free-running fit of stop base (4) front end; During conventional brake, the big end of slide block (19b) is resisted against on the plane (2d1) of sliding bush apparatus (2) boss one, and restriction sliding bush apparatus (2) is with respect to the displacement backward of piston shell; During emergency braking; Because stop base (4) stroke of displacement forward surpasses the gap on slide block small end (19a) and stop base (4) front end circular cone inclined-plane; Stop base (4) front end circular cone pushed slide block small end (19a) is to side travel; Make the big end of slide block (19b) also to side travel, break away from the boss plane (2d1) of sliding bush apparatus (2), sliding bush apparatus this moment (2) slides backward under the effect of sliding sleeve pull back spring one (17); Plane (2d1) to sliding bush apparatus (2) boss two is resisted against on the big end of slide block (19b); Said sliding bush apparatus (2) promotes valve circle assembly (16) piston shell displacement backward relatively, and atmospheric valve seat (S3) and valve circle assembly (16) are broken away from, and the aperture of atmosphere valve port (K2) is greater than the aperture in the conventional brake process.
3. a kind of servo-unit according to claim 2 with emergency braking function; It is characterized in that: also include key (18), hole two (2c) is upwards also offered in said sliding bush apparatus (2) footpath, and said key (18) is shaft-like; The one of which end is resisted against inner walls (34a); The other end passes hole two (2c), leans the displacement backward of restriction stop base with the flange face (4a) of stop front end of base.
4. a kind of servo-unit according to claim 3 with emergency braking function; It is characterized in that: the lower surface of the big end (19b) of said slide block (19) is provided with two open slots (19c); Said returning device is the slide block jump ring (1) of open circles annular; The annular section of said slide block jump ring (1) is installed on the piston shell (7), and the two ends of opening are stuck in two open slots (19c) of the big end of slide block (19b) lower surface; During conventional brake; The big end of this slide block (19b) is stuck on the boss plane (2d1) of sliding bush apparatus (2); After emergency braking finishes; Sliding bush apparatus (2) is got back to the normal brake application position under the effect of pull back spring two (30) and key (18), slide block jump ring (1) makes slide block be moved upward to non-emergent braking position.
5. a kind of servo-unit with emergency braking function according to claim 4 is characterized in that: said sliding bush apparatus (2) outside face is provided with groove two (2g) vertically, cooperates with the muscle (43,44) of piston inner surface of outer cover projection.
6. according to each described a kind of servo-unit of claim 1-5 with emergency braking function; It is characterized in that: said sliding bush apparatus (2) rear end is provided with annular groove one (2a), is equipped with and piston inner surface of outer cover leak free seal ring (5) in this annular groove one (2a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204850844U CN202320270U (en) | 2011-11-28 | 2011-11-28 | Booster with emergency braking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204850844U CN202320270U (en) | 2011-11-28 | 2011-11-28 | Booster with emergency braking function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202320270U true CN202320270U (en) | 2012-07-11 |
Family
ID=46432261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204850844U Withdrawn - After Issue CN202320270U (en) | 2011-11-28 | 2011-11-28 | Booster with emergency braking function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202320270U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431538A (en) * | 2011-11-28 | 2012-05-02 | 广东中博汽车零部件有限公司 | Booster with emergency braking function |
-
2011
- 2011-11-28 CN CN2011204850844U patent/CN202320270U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431538A (en) * | 2011-11-28 | 2012-05-02 | 广东中博汽车零部件有限公司 | Booster with emergency braking function |
| CN102431538B (en) * | 2011-11-28 | 2014-05-07 | 广东中博汽车零部件有限公司 | Booster with emergency braking function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20140507 |
|
| RGAV | Abandon patent right to avoid regrant |