CN102167025B - Mechanical vacuum booster for vehicle - Google Patents
Mechanical vacuum booster for vehicle Download PDFInfo
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- CN102167025B CN102167025B CN 201110065856 CN201110065856A CN102167025B CN 102167025 B CN102167025 B CN 102167025B CN 201110065856 CN201110065856 CN 201110065856 CN 201110065856 A CN201110065856 A CN 201110065856A CN 102167025 B CN102167025 B CN 102167025B
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Abstract
The invention discloses a mechanical vacuum booster for a vehicle, which comprises an input rod, a valve body, an output rod and a shell, wherein the valve body is internally provided with a spring device, a seal device, a large plunger piston, a proportion plate and a reaction plate; the parts are coaxially and sequentially arranged such as the input rod, the large plunger piston, the proportion plate, the reaction plate, the output rod and the like, a small plunger piston and a small locking plate are arranged between the large plunger piston and the proportion plate, and the small plunger piston can slide along the small locking plate; and the valve body is further internally provided with a large locking plate, the large locking plate is matched with the large plunger piston, the large locking plate can slide along the large plunger piston, and the large locking plate is linked with the small locking plate. The technical problems that the less braking force can not be amplified and is hard to keep in the prior art are solved; the mechanical vacuum booster is novel in structure and low in cost; compared with the normal booster, the mechanical vacuum booster only has two more parts; the vacuum booster can output a larger acting force to a braking main cylinder only by the means that certain input power requirement is met when the emergency braking is applied by a driver; and the pressure is kept under the condition that the input force is reduced, so that the braking distance of the whole vehicle is shortened, and the mechanical vacuum booster is particularly effective for the unskilled drivers and the braking hesitators.
Description
Technical field
The invention belongs to vehicle with brake auxiliary device manufacturing technology field, specifically, relate to a kind of mechanical vacuum booster for vehicle; The alleged vehicle of the present invention include but not limited to take combustion engine as main power source self-propelled vehicle, take motor as the major impetus source vehicle; Mechanical vacuum booster involved in the present invention is in the situation that certain horsepower input is arranged, to obtain the power output of an increasing when emergency braking, and obtains comparatively constant pressure maintenance.
Background technology
At present, in automobile braking system, especially in brake system of car manufacturing technology field, mechanical vacuum booster has become the critical component in the auto brake system; The effect of this vacuum booster is that the vacuum of utilizing engine intake manifold vacuum or aux. vacuum pump to produce is amplified brake pedal force, thereby chaufeur is alleviated for the power of braking, and takes easily and efficiently brake measure.
In the prior art, structure and the principle of work of vacuum booster are as follows, usually vacuum booster comprises two chambeies, one is vacuum chamber, one is atmosphere chamber, when servo-unit is worked, and the draught head that utilizes above-mentioned vacuum chamber and atmosphere chamber to produce, the braking force pushing executing mechanism action of driver assistance, thus realize the power-assisted effect.There is following technological deficiency in vacuum booster of the prior art:
1, conventional vacuum booster of the prior art in the situation that chaufeur only applies less treadle effort, can not increase rapidly the power-assisted effect of vacuum booster, thereby make the braking effect of car load not obvious when the chaufeur apply the emergency brake.
2, conventional vacuum booster of the prior art is when apply the emergency brake, need chaufeur to apply larger treadle effort, to be an operating barrier to small and weak or unskilled chaufeur, can not well implement brake measure, if perhaps apply for a long time larger braking force, chaufeur is produced tired, thereby cause the generation of relevant accident.
3, conventional vacuum booster of the prior art is when apply the emergency brake, and vacuum booster is difficult for keeping to required treadle effort, pedal pressing force can occur and keep situation incessantly, causes braking effect poor, will lead to a disaster when serious.
Summary of the invention
Technical scheme provided by the invention technical matters to be solved is, conventional vacuum booster of the prior art is when the chaufeur apply the emergency brake, if chaufeur only applies in the situation of less treadle effort, can not increase rapidly the power-assisted effect of vacuum booster, affect the car load braking effect; Simultaneously, when apply the emergency brake, to be an operating barrier to small and weak or unskilled chaufeur, can not well implement brake measure, perhaps apply for a long time larger braking force, chaufeur is produced tired, thereby the technical matterss such as generation that cause relevant accident, and provide a kind of mechanical vacuum booster with emergency braking function, when carrying out emergency braking, need chaufeur to apply larger treadle effort and the difficult shortcoming that keeps of required treadle effort to solve conventional vacuum booster, guarantee the sufficient power-assisted effect that has of vacuum booster, thereby guarantee the braking effect of car load.
Design concept of the present invention is, on the basis of existing vacuum booster, increased small plunger and little locking plate, and improved the structure of large locking plate, made large locking plate and little locking plate realize interlock, further, on the basis of conventional vacuum booster, increased little locking plate and small plunger, and normal locking plate particular design, be that bending is processed, as large locking plate.In course of normal operation, large small plunger moves forward together, and little locking plate is strutted by small plunger, and small plunger can be free to slide between little locking plate, guarantees that the power of feeding back can be delivered to brake pedal and again the small plunger pushed home be put simultaneously; In the emergency brake operations process, small plunger is from slippage between the little locking plate, the little locking plate shape that under self elastic reaction, affranchises, block the rollback of small plunger, thereby cut-out feedback force, realization easily keeps the atmosphere valve opening under less treadle effort, thereby realizes that atmosphere fully enters into servo-unit atmosphere epitrochoidal chamber, makes that servo force is instantaneous to reach capacity.Increase the purpose of little locking plate, be in order to realize under less treadle effort easily keeping the atmosphere valve opening, thereby realize that atmosphere fully enters into servo-unit atmosphere epitrochoidal chamber, servo force moment is reached capacity.Adopting the scheme of the large locking plate of bending, bend the purpose of large locking plate, is in order to realize releasing process, and specifically little locking plate relies on large locking plate bending boss to strut, and small plunger is moved, the realization release.Be specially: in the emergency braking dispose procedure, along with vacuum valve is return and opened to the relative valve body of plunger, pressure reduction between atmosphere epitrochoidal chamber and the vacuum work chamber rapidly disappears, valve body is under the effect of return big spring, and rollback is to initial position, thereby large locking plate touches back cover and is forced to relative valve body reach by rear housing is spacing, this moment, little locking plate was strutted by large locking plate bending boss, thereby make small plunger under the compressing of feedback force, be able to rollback, again between little locking plate, slide, realize release.
Technical scheme provided by the present invention, a kind of mechanical vacuum booster for vehicle comprises input bar, valve body, take-off lever, housing, is furnished with spring installation, sealing arrangement, large plunger, ratio dish, reaction plate in the described valve body; The parts such as described input bar, large plunger, ratio dish, reaction plate, take-off lever are coaxial and arrange according to this, are provided with small plunger and little locking plate between described large plunger and described ratio dish, and described small plunger can be along little locking plate slip; Described valve inner also is provided with large locking plate, and described large locking plate cooperates with described large plunger, and described large locking plate can slide along large plunger, described large locking plate and described little locking plate interlock.
Described large plunger is made of large end, middle part, small end, and described large plunger middle part is provided with annular groove;
Also be provided with small plunger in the described valve body, described small plunger is between described large plunger and described ratio dish, and described small plunger one end is provided with counterbore, and the small end of described large plunger is installed in the counterbore of described small plunger;
Described valve body body is provided with large, little two square through slots, the middle part annular groove of the corresponding described large plunger of described valve body large square through slot, an end of the corresponding small plunger of the little square through slot of described valve body;
Be provided with large locking plate in the described large square through slot, described large locking plate integral body is " U " shape, described large locking plate is by bending closing end, middle part and open shelves ends and consist of, and described large locking plate middle part cooperates with the middle part annular groove of described large plunger, can be along large plunger relative sliding in the middle part of the described large locking plate;
Be provided with little locking plate in the described little square through slot, described little locking plate integral body is " U " shape, and described little locking plate is by closing end, middle part and open shelves ends and consist of, and described little locking plate middle part contact cooperation with small plunger, and described small plunger can be along slip in the middle part of the little locking plate;
The bending closing end of opening shelves end and described large locking plate of described little locking plate is arranged in the same side; And the bending closing end of described large locking plate is to grade extreme direction bending of opening of described little locking plate.
Described spring installation comprises filter screen spring perch, cone-shaped spring, spring perch, Compress Spring, and described sealing arrangement comprises the vacuum leather cup, and described input bar passes described filter screen spring perch, cone-shaped spring, spring perch, Compress Spring, vacuum leather cup successively;
Bulb on the described input bar partly stretches in the counterbore of described huge pillar setting beyond the Great Wall, and described input bar and described large plunger pass through riveting together, and described input bar can rotate relative to described large plunger;
Step on the described input bar is pressed in that the contact left-hand thread connects on the step of filter screen spring perch inwall;
Described spring perch is pressed on the first boss upper surface in the described valve body;
Described cone-shaped spring is between filter screen spring perch and spring perch;
Described vacuum leather cup one end has internal buckle ring to be positioned at described valve body the first boss inboard and is buckled in the circular groove of spring perch lower end, the other end end face of described vacuum leather cup is connected with the second boss contact in the described valve body, forms vacuum valve between the second boss in the end face of described vacuum leather cup and the described valve body.
Comprise front case, rear housing, diaphragm and diaphragm dish in the described housing, described diaphragm is sleeved on the described diaphragm dish, pass through riveting between described diaphragm dish and the described valve body, the interstitial hole of described diaphragm is connected with described valve body Interference contact, described diaphragm edge part is connected with described front case, rear housing marginal portion Interference contact, and described front case and described rear housing pass through riveting in its marginal portion.
Be provided with large pull back spring in the described front case, described large pull back spring one end withstands on the described valve body, and the other end withstands on the front case.
Technical scheme provided by the present invention can effectively solve, conventional vacuum booster of the prior art is when the chaufeur apply the emergency brake, if chaufeur only applies in the situation of less treadle effort, can not increase rapidly the power-assisted effect of vacuum booster, affect the car load braking effect; Simultaneously, when apply the emergency brake, to be an operating barrier to small and weak or unskilled chaufeur, can not well implement brake measure, perhaps apply for a long time larger braking force, chaufeur is produced tired, thereby the technical matterss such as generation that cause relevant accident, the invention has the advantages that simultaneously: novel structure, with low cost, only have more two parts than normal servo-unit, chaufeur is when apply the emergency brake, as long as satisfy certain horsepower input requirement, vacuum booster can be exported larger application force to master brake cylinder, 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.
Description of drawings
By reference to the accompanying drawings, the present invention is described further:
Fig. 1 is vacuum booster assembly incipient state revolved section schematic diagram of the present invention;
Fig. 2 is the large plunger 3-D view of the present invention and generalized section;
Fig. 3 is the large locking plate 3-D view of the present invention;
Fig. 4 is small plunger generalized section of the present invention;
Fig. 5 is the little locking plate 3-D view of the present invention and front elevation;
Fig. 6 is not braking mode control cock assembly cross-sectional schematic of the present invention;
Fig. 7 is the not position relationship schematic diagram between braking mode locking plate and the plunger of the present invention;
Fig. 8 is normal brake application state control cock assembly cross-sectional schematic of the present invention;
Fig. 9 is emergency braking excited state control cock assembly cross-sectional schematic of the present invention;
Figure 10 is the position relationship schematic diagram between emergency braking excited state locking plate of the present invention and the plunger;
Figure 11 is emergency braking hold mode control cock assembly cross-sectional schematic of the present invention;
Figure 12 is that emergency braking of the present invention discharges momentary status control cock assembly cross-sectional schematic;
Figure 13 is that emergency braking of the present invention discharges released state control cock assembly cross-sectional schematic;
Wherein, 1-inputs bar, 2-inner filter core, the 3-cone-shaped spring, 4-spring perch, 5-Compress Spring, 6-vacuum leather cup, the end face of 6a-vacuum leather cup bottom, the large plunger of 7-, the large end of the large plunger of 7a-edge boss, the large plunger of 7b-middle part annular groove the first end face, the large plunger of 7c-middle part annular groove the second end face, the large plunger small end of 7d-end face, the large locking plate of 8-, the large locking plate bending of 8a-closing end, the large locking plate of 8b-middle part, the large locking plate of 8c-is opened the shelves end, the 9-small plunger, 9a-small plunger external cylindrical surface, 9b-small plunger end face, 9c-small plunger counterbore bottom surface, 10-ratio dish, 11-reaction plate, 12-take-off lever, the 13-circlip, the little locking plate of 14-, the little locking plate of 14a-are opened the shelves end, the little locking plate of 14b-middle part, the little locking plate closing end of 14c-, the second boss in the first boss in the 15-valve body, 15a-valve body, 15b-valve body, 15c-valve body large square through slot its right end face, the little square through slot its right end face of 15d-valve body, the little square through slot left end face of 15e-valve body, 15f-valve body large square through slot left end face, 16-filter screen spring perch, the 17-rear housing, epitrochoidal chamber behind the 18-, 19-diaphragm, 20-diaphragm dish, epitrochoidal chamber before the 21-front case, 22-, the large pull back spring of 23-.
The specific embodiment
By reference to the accompanying drawings, the technical solution adopted in the present invention is a kind of mechanical vacuum booster with emergency braking function, and concrete scheme is as follows:
A kind of mechanical vacuum booster with emergency braking function, its control cock assembly comprises valve body 15, input bar 1, filter screen spring perch 16, cone-shaped spring 3, spring perch 4, Compress Spring 5, vacuum leather cup 6, large plunger 7, small plunger 9, large locking plate 8, little locking plate 14, ratio dish 10, reaction plate 11, described input bar 1 passes filter screen spring perch 16 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 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 16 inwalls, described spring perch 4 is pressed on the first boss 15a upper surface in the valve body, cone-shaped spring 3 is between filter screen spring perch 16 and spring perch 4, described vacuum leather cup 6 one ends have internal buckle ring to be positioned at valve body 15 first boss inboard 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 the second boss 15b contact in the valve body, forms vacuum valve between the second boss 15b in the end face of described vacuum leather cup 6 and the valve body; There are two square through slots of size at described valve body 15 middle parts, large locking plate 8 is loaded in the large square through slot, little locking plate 14 is loaded in the little square through slot, described large locking plate 8 U-shaped like, the closing end bending, the middle part contacts cooperation with large plunger 7 middle part annular grooves, can be along large plunger 7 relative slidings, described little locking plate 14 is U-shaped like also, one end is closed, the other end is opened shelves, the middle part contacts cooperation with small plunger 9, small plunger 9 can slide along little locking plate middle part 14b, described large plunger 7 has big or small two ends, there is annular groove at the middle part, holds greatly the edge that boss is arranged, and cooperates with vacuum leather cup 6, form the atmosphere valve, large end middle part is fluted, and input bar 1 bulb is packed in this groove, and large plunger 7 small ends cooperate with small plunger 9, described small plunger 9 is cylindrical, one end contacts with described ratio dish 10, and the other end has counterbore, and large plunger 7 small ends are loaded in this counterbore, in this control cock general assembly process, the shelves of opening of the closing end of large locking plate 8 bendings and little locking plate 14 are held on one side, guarantee that large locking plate 8 dogleg section can strut little locking plate 14, so that little locking plate middle part 14b is placed on small plunger 9 cylinders.In the normal brake application process, small plunger 9 moves less displacement together relative to valve body 15, and little locking plate middle part 14b can not break away from the cylinder of small plunger 9; In the emergency braking process, small plunger 9 moves larger displacement together relative to valve body 15, little locking plate middle part 14b comes off from small plunger 9 cylinders, little locking plate middle part 14b will have with small plunger 9 end contact of counterbore, namely realize the emergency braking locking, the such power that feeds back of passing ratio dish 10, major part passes to little locking plate 14 by small plunger 9, pass to valve body 15 by little locking plate 14 again, the power that feeds back to input bar 1 is very little, as long as just can keep atmosphere valve openings between large plunger 7 large end boss and the vacuum leather cup 6 so apply very little Input Forces, both realized that less treadle effort kept larger braking force, greatly shortened stopping distance; When emergency braking discharges, locking plate 8 is first spacing by rear housing 17 greatly, valve body 15, little locking plate 14, small plunger 9, ratio dish 10 move after continuing, large locking plate 8 bending ends strut little locking plate 14, under the effect of feedback force, small plunger 9 cylinders contact cooperation with little locking plate 14 middle parts again, namely realize the emergency braking release.
As shown in Figure 1, the vacuum booster assembly that has an emergency braking function comprises the parts such as input bar 1, filter screen spring perch 16, inner filter core 2, cone-shaped spring 3, spring perch 4, Compress Spring 5, vacuum leather cup 6, large plunger 7, large locking plate 8, small plunger 9, ratio dish 10, reaction plate 11, take-off lever 12, circlip 13, little locking plate 14, valve body 15, filter screen spring perch 16, rear housing 17, diaphragm 19, diaphragm dish 20, front case 21 and large pull back spring 23.Riveting between diaphragm dish 20 and the valve body 15, diaphragm 19 is enclosed within on the diaphragm dish, diaphragm 19 interstitial holes are connected with valve body 15 Interference contacts, diaphragm 19 marginal portions and front case 21, rear housing 17 marginal portion Interference contacts connect, front case 21, rear housing 17 is at its marginal portion riveting, the space that forms between front case 21 and the diaphragm 19 is epitrochoidal chamber 22 (also can be described as vacuum chamber) before the servo-unit, the space that forms between rear housing 17 and the diaphragm 19 is epitrochoidal chamber 18 behind the servo-unit (also can be described as atmosphere chamber), large pull back spring 23 1 ends withstand on the valve body 15, and the other end withstands on the front case 21.In the braking procedure, be vacuum in the front epitrochoidal chamber 22,18 enter atmosphere in the rear epitrochoidal chamber, produce power-assisted thereby two chambeies produce pressure reduction.
With reference to the accompanying drawings shown in 1,2,3,4,5,6.Under braking mode not, under the effect of large pull back spring 23, valve body 15 contacts with large locking plate 8 by end face 15c, and locking plate leans against on the step surface of rear housing 17 greatly, thereby reaches initial equilibrium conditions.Form vacuum valve between the second boss 15b and the vacuum leather cup end face 6a in the described valve body 15, under braking mode not, there is certain gap width between the two, this gap width also is the idle travel of vacuum booster, vacuum valve is the passage that connects rear epitrochoidal chamber 18 and front epitrochoidal chamber 22, and the prerequisite that vacuum booster produces power-assisted is that vacuum valve is closed; Described large plunger 7 large end edge boss 7a are connected with vacuum leather cup end face 6a Interference contact, form the atmosphere valve between the two, the atmosphere valve closing, then epitrochoidal chamber 18 is isolated with ambient atmosphere behind the servo-unit, the atmosphere valve open, epitrochoidal chamber 18 begins to enter atmosphere then, and produces pressure reduction and power-assisted between the front epitrochoidal chamber 22, and the small end of large plunger 7 is loaded in the counterbore of small plunger 9; Described large locking plate 8 is loaded in the large square through slot of valve body 15, and under the effect of cone-shaped spring 3, large plunger 7 contacts with large locking plate 8 by end face 7c and spacing; Described little locking plate 14, be loaded in the little square through slot of valve body 15, in fitting process, guarantee that the bending closing end 8a that opens shelves end 14a and large locking plate 8 of little locking plate 14 is in a side, but also the dogleg section that must guarantee large locking plate is held 14a towards the shelves of opening of little locking plate, guaranteed that like this by the closed bending end of large locking plate 8a little locking plate being opened shelves end 14a struts, and then the middle part 14b that has guaranteed little locking plate is enclosed within on the external cylindrical surface 9a of small plunger 9, as shown in Figure 7, this is the key that realizes emergency braking function; Described small plunger 9, one ends contact with the ratio dish, and the other end has counterbore, and this counterbore will cooperate with the small end of large plunger.
1. normal brake application process
With reference to the accompanying drawings 1,6,8, not under the braking mode, atmosphere valve closing, vacuum break valve.When beginning to brake, brake pedal force overcomes cone-shaped spring 3 drags, promoting input bar 1 moves forward, input bar 1 promotes again large plunger 7 and moves forward, and large plunger 7 promotes again small plunger 9 and moves forward, and vacuum leather cup end face 6a moves forward under the effect of Compress Spring 5, until vacuum leather cup end face 6a contacts with the second boss 15b in the valve body, this moment, vacuum valve was closed, and the atmosphere valve still is in closed condition, and front epitrochoidal chamber 22 and rear epitrochoidal chamber 18 are isolated.Begin mobilely from input bar 1, close to vacuum valve and to input the idle travel that distance that bar moves is called servo-unit.Along with input bar 1 continues reach, vacuum leather cup end face 6a is spacing by the second boss 15b in the valve body, and the large large end of plunger edge boss 7a separates with vacuum valve end face 6a, and atmosphere valve open, rear epitrochoidal chamber 18 begin to enter atmosphere, and servo-unit begins power-assisted.
In the normal brake application process, input bar 1 drives large plunger 7, small plunger 9 relative valve bodies 15 have individual relative displacement, and this relative displacement is very little, and the middle part 14b of little locking plate 14 is on the face of cylinder 9a of small plunger 9 all the time.When keeping a certain power, brake pedal is worth when constant, it is motionless that large plunger 7 and small plunger 9 rest on a certain position, because the movement of valve body 15 lags behind the movement of large plunger 7, so this moment, valve body 15 still can move forward under the effect of pressure reduction, vacuum leather cup end face 6a also moves forward under the effect of Compress Spring 5, until vacuum leather cup end face 6a contacts with large plunger boss 7a, atmosphere valve, vacuum valve all are in closed condition at this moment, 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, drive the vacuum leather cup also mobile backward, vacuum leather cup end face 6a is separated with the second boss 15b in the valve body, vacuum break valve, rear epitrochoidal chamber 18 and front epitrochoidal chamber 22 communicate, and two chamber pressure reduction disappear.Under the effect of return big spring 23, valve body 15 beginnings are mobile backward.When large locking plate 8 with after rear housing 17 contacts, large locking plate 8 is limited slack, and this moment, valve body 15 continues mobile backward under the effect of return big spring 23, until valve body large square through slot step surface 15c contacts with large locking plate 8, valve body moves after stopping, and this moment, servo-unit control cock assembly was got back to again not braking mode position shown in Figure 6.2. emergency braking working process
1) emergency braking excitation process
With reference to the accompanying drawings 1,6,9, during emergency braking, brake pedal is stepped on rapidly, and input bar 1 drives large plunger 7, small plunger 9 relative valve bodies 15 have a larger relative displacement, and this moment, the middle part 14b of little locking plate 14 separated with the face of cylinder 9a of small plunger 9, little locking plate 14 is under self elastic reaction, middle part 14b diminishes, and the circular arc internal diameter of little locking plate middle part 14b mating part is less than the external diameter on small plunger 9 faces of cylinder, and this moment, small plunger 9 was by little locking plate 14 lockings, emergency braking function is excited, as shown in Figure 10.After emergency braking function was excited, the power that feeds back by reaction plate 11 most ofly passed to valve body 15 through ratio dish 10, small plunger 9, little locking plate 14, and the power that passes to large plunger is very little, and then it is very little to feed back to the power of brake pedal.
2) emergency braking keep-process
With reference to the accompanying drawings 11.After emergency braking function is excited, if Input Forces reduces, feedback force can promote small plunger 9 to movement, because small plunger 9 is by little locking plate 14 lockings, the end face 9b of small plunger 9 contacts with little locking plate 14, little locking plate 14 contacts with the left end face 15e of valve body 15 little square through slots again, along with Input Forces further reduces, large plunger 7 can continue mobile backward, small plunger 9 is not moved backward by little locking plate 14, valve body 15 spacing can not continuation, this moment, the feedback force major part of servo-unit power output was born by valve body, and the power that passes to brake pedal is very little.
After emergency braking function is excited, Input Forces reduces, small plunger 9 is by little locking plate 14, valve body 15 is by locking, with reference to the accompanying drawings 11, suppose that the distance between the second boss 15b is x1 at this moment large plunger 7 large end edge boss 7a and the valve body 15, distance between large plunger 7 small end end face 7d and the small plunger 9 counterbore bottom surface 9c is x2, valve body 15 little square through slot left end face 15e to the distance between valve body the second boss 15b be a, large plunger 7 large end outer boss 7a to the distance between the small end face 7d be b, as shown in Figure 2, the small plunger 9 counterbore degree of depth are c, as shown in Figure 4, the thickness of little locking plate 14 is t, and calculating by dimension chain has following formula to set up:
x1+x2＝a+c+t-b
Work as x2=0, x1=a+c+t-b then, also be small plunger 9 by little locking plate 14 lockings after, the small end end face 7d of large plunger 7 contacts with the counterbore bottom surface 9c of small plunger 9, plunger 7 is about to separate with small plunger 9 greatly;
When x2＞0, then x1＜a+c+t-b also is that large plunger 7 separates with small plunger 9, and the feedback force major part is born by valve body 15;
Work as x2=a+c+t-b, then x1=0 also is that the boss 7a of large plunger 7 begins to contact with the end face 6a of vacuum leather cup, and the atmosphere valve begins to close;
As x2＞a+c+t-b, x1＜0 then, this moment large plunger 7 boss 7a with the end face 6a top of vacuum leather cup the second boss 15b in the valve body 15, i.e. vacuum break valve, rear epitrochoidal chamber 18 begins to communicate with front epitrochoidal chamber 22, two chambeies begin pressure release, braking release.
In sum, after emergency braking function is excited, if 0＜x1＜a+c+t-b, the atmosphere valve is in open mode all the time, pressure reduction between rear epitrochoidal chamber 18 and the front epitrochoidal chamber 22 is maintained, although Input Forces reduces, the power-assisted of servo-unit does not reduce, the High power output of servo-unit partly is held, the keep-process of Here it is emergency braking.In addition, because after emergency braking function was excited, the feedback force major part was born by valve body 15, the power that feeds back to brake pedal is less, the driver only need apply less treadle effort can overcome this power, only that is to say to apply the keep-process that less treadle effort can be realized emergency braking.
3) emergency braking dispose procedure
Releasing brake pedal, input bar 1 drive large plunger 7 mobile backward under the effect of cone-shaped spring 3.If x2＞a+c+t-b, x1＜0, with reference to the accompanying drawings 11,12, the atmosphere valve is in closed condition, and vacuum valve begins to open, and servo-unit begins pressure release.Because in the emergency braking process, the control cock assembly moves to the servo-unit middle part, large locking plate 8 can be not spacing by rear housing 17, the large meeting of plunger 7 under the effect of cone-shaped spring 3 drives large locking plate 8 and return back to end position, middle part annular groove the second end face 7c that is large plunger 7 contacts with large locking plate 8, and large locking plate 8 leans against on the valve body 15 large square through slot left end face 15f, the vacuum break valve between the second boss 15b is maximum in vacuum leather cup end face 6a and the valve body 15 at this moment, the rapid pressure release of servo-unit.After pressure reduction between rear epitrochoidal chamber 18 and the front epitrochoidal chamber 22 begins to reduce, under the effect of return big spring 23, valve body 15 beginnings are mobile backward, after moving a certain distance backward, large locking plate 8 contacts with the step surface of rear housing 17, large locking plate 8 is limited, large plunger 7 also limited stopping to move, move after valve body 15 continues at this moment, the moving little locking plate 14 of valve body 15 rear shipper poles is oppressed by large locking plate 8, and large locking plate bending closing end 8a opens a shelves end 14a with little locking plate and struts, the circular arc internal diameter of little locking plate middle part 14b mating part becomes large, move after valve body continues, it is large that this internal diameter continues to become, when this internal diameter become greater to external diameter greater than small plunger 9 face of cylinder 9a, such as accompanying drawing 13, small plunger 9 is under the effect of feedback force, and the face of cylinder 9a of small plunger 9 cooperates with the circular arc portion of little locking plate 14 middle part 14b again, and small plunger 9 is removed from lockup state.When after after pressure reduction between epitrochoidal chamber 18 and the front epitrochoidal chamber 22 thoroughly disappears, the control cock assembly of vacuum booster has been got back to again the not braking mode shown in the accompanying drawing 6.
Claims (9)
1. mechanical vacuum booster for vehicle, comprise input bar (1), valve body (15), take-off lever (12), housing, be furnished with spring installation, sealing arrangement, large plunger (7), ratio dish (10), reaction plate (11) in the described valve body (15); Described input bar (1), large plunger (7), ratio dish (10), reaction plate (11), take-off lever (12) is coaxial and be arranged in order, it is characterized in that,
Described large plunger (7) is made of large end, middle part, small end, and described large plunger (7) middle part is provided with annular groove;
Be provided with small plunger (9) in the described valve body (15), described small plunger (9) is positioned between described large plunger (7) and the described ratio dish (10), described small plunger (9) one ends are provided with counterbore, and the small end of described large plunger (7) is installed in the counterbore of described small plunger (9);
Described valve body (15) body is provided with large, little two square through slots, the middle part annular groove of the corresponding described large plunger of described valve body (15) large square through slot (7), an end of the little corresponding small plunger of square through slot of described valve body (15) (9);
Be provided with large locking plate (8) in the described large square through slot, described large locking plate (8) integral body is " U " shape, described large locking plate (8) is opened shelves ends (8c) by large locking plate bending closing end (8a), large locking plate middle part (8b) and large locking plate and is consisted of, described large locking plate middle part (8b) cooperates with the middle part annular groove of described large plunger (7), and described large locking plate middle part (8b) can be along large plunger (7) relative sliding;
Be provided with little locking plate (14) in the described little square through slot, described little locking plate (14) integral body is " U " shape, described little locking plate (14) is opened shelves ends (14a) by little locking plate closing end (14c), little locking plate middle part (14b) and little locking plate and is consisted of, described little locking plate middle part (14b) contacts cooperation with small plunger (9), and described small plunger (9) can slide along little locking plate middle part (14b);
The bending closing end of opening shelves end and described large locking plate (8) of described little locking plate (14) is arranged in the same side; And the bending closing end of described large locking plate (8) is to grade extreme direction bending of opening of described little locking plate (14).
2. a kind of mechanical vacuum booster for vehicle according to claim 1, it is characterized in that, described spring installation comprises filter screen spring perch (16), cone-shaped spring (3), spring perch (4), Compress Spring (5), described sealing arrangement comprises vacuum leather cup (6), and described input bar (1) passes described filter screen spring perch (16), cone-shaped spring (3), spring perch (4), Compress Spring (5), vacuum leather cup (6) successively; Bulb on the described input bar (1) partly stretches in the counterbore of described large plunger (7), and described input bar (1) passes through riveting together with described large plunger (7), and described input bar (1) can rotate relative to described large plunger (7).
3. a kind of mechanical vacuum booster for vehicle according to claim 2 is characterized in that, the 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 (16) inwall.
4. a kind of mechanical vacuum booster for vehicle according to claim 3 is characterized in that, described spring perch (4) is pressed on the first boss (15a) upper surface in the described valve body.
5. a kind of mechanical vacuum booster for vehicle according to claim 4 is characterized in that, described cone-shaped spring (3) is positioned between filter screen spring perch (16) and the spring perch (4).
6. according to claim 4 or 5 described a kind of mechanical vacuum booster for vehicles, it is characterized in that, described vacuum leather cup (6) one ends have internal buckle ring to be positioned at described valve body (15) first boss inboard and are buckled in the circular groove of spring perch (4) lower end, the other end end face of described vacuum leather cup (6) is connected with the second boss (15b) contact in the described valve body, forms vacuum valve between the second boss (15b) in the end face of described vacuum leather cup (6) and the described valve body.
7. a kind of mechanical vacuum booster for vehicle according to claim 6, it is characterized in that, comprise front case (21), rear housing (17), diaphragm (19) and diaphragm dish (20) in the described housing, described diaphragm (19) is sleeved on the described diaphragm dish (20), passes through riveting between described diaphragm dish (20) and the described valve body (15).
8. a kind of mechanical vacuum booster for vehicle according to claim 7, it is characterized in that, the interstitial hole of described diaphragm (19) is connected with described valve body (15) Interference contact, described diaphragm (19) marginal portion is connected with described front case (21), rear housing (17) marginal portion Interference contact, and described front case (21) passes through riveting with described rear housing (17) in its marginal portion.
9. according to claim 7 or 8 described a kind of mechanical vacuum booster for vehicles, it is characterized in that, be provided with large pull back spring (23) in the described front case (21), described large pull back spring (23) one ends withstand on the described valve body (15), and the other end withstands on the front case (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110065856 CN102167025B (en) | 2011-03-18 | 2011-03-18 | Mechanical vacuum booster for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110065856 CN102167025B (en) | 2011-03-18 | 2011-03-18 | Mechanical vacuum booster for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102167025A CN102167025A (en) | 2011-08-31 |
| CN102167025B true CN102167025B (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110065856 Active CN102167025B (en) | 2011-03-18 | 2011-03-18 | Mechanical vacuum booster for vehicle |
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| Country | Link |
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| CN (1) | CN102167025B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103010197B (en) * | 2012-11-28 | 2015-04-22 | 芜湖伯特利汽车安全系统有限公司 | Mechanical vacuum booster |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1413154A (en) * | 1999-10-29 | 2003-04-23 | 爱信精机株式会社 | Negative pressure type booster |
| EP1371536A1 (en) * | 2002-06-14 | 2003-12-17 | Bosch Automotive Systems Corporation | Negative pressure boosting device |
| CN1681693A (en) * | 2002-09-19 | 2005-10-12 | 博施制动系统公司 | Automobile brake servomotor |
| US7255408B2 (en) * | 2001-08-24 | 2007-08-14 | Aisin Seiki Kabushiki Kaisha | Vacuum booster |
| CN101612933A (en) * | 2009-07-17 | 2009-12-30 | 芜湖伯特利汽车安全系统有限公司 | A kind of mechanical vacuum booster with emergency braking function |
| CN201941753U (en) * | 2011-03-18 | 2011-08-24 | 芜湖伯特利汽车安全系统有限公司 | Mechanical vacuum booster |
-
2011
- 2011-03-18 CN CN 201110065856 patent/CN102167025B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1413154A (en) * | 1999-10-29 | 2003-04-23 | 爱信精机株式会社 | Negative pressure type booster |
| US7255408B2 (en) * | 2001-08-24 | 2007-08-14 | Aisin Seiki Kabushiki Kaisha | Vacuum booster |
| EP1371536A1 (en) * | 2002-06-14 | 2003-12-17 | Bosch Automotive Systems Corporation | Negative pressure boosting device |
| CN1681693A (en) * | 2002-09-19 | 2005-10-12 | 博施制动系统公司 | Automobile brake servomotor |
| CN101612933A (en) * | 2009-07-17 | 2009-12-30 | 芜湖伯特利汽车安全系统有限公司 | A kind of mechanical vacuum booster with emergency braking function |
| CN201941753U (en) * | 2011-03-18 | 2011-08-24 | 芜湖伯特利汽车安全系统有限公司 | Mechanical vacuum booster |
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| Publication number | Publication date |
|---|---|
| CN102167025A (en) | 2011-08-31 |
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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. |