CN101240721A - Air valve bridge - Google Patents
Air valve bridge Download PDFInfo
- Publication number
- CN101240721A CN101240721A CNA2007100672314A CN200710067231A CN101240721A CN 101240721 A CN101240721 A CN 101240721A CN A2007100672314 A CNA2007100672314 A CN A2007100672314A CN 200710067231 A CN200710067231 A CN 200710067231A CN 101240721 A CN101240721 A CN 101240721A
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- Prior art keywords
- bridge
- valve
- valve stem
- air valve
- valve bridge
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Abstract
The present invention provides a bridge-shape valve bridge, instantly an cross bar likes a bridge, there are a downward column hollow space which is gap fit with valve lever at the connecting place of with valve lever, upper bottom of hollow space is contacted with valve lever contacted face, the shape of hollow space upper bottom is spherical crown downward bulge. Valve bridge and part connected with valve lever are spherical crown shape, and both of them is dot contact. So, No matter how change of machine precision of valve bridge or assemble accuracy of mechanism, each valve lever applied force uniform only in the fit clearance allowable range between spherical crown arch height, valve lever and valve bridge, assuring valve lever play along precise track, satisfying design requirements, and increasing mechanism service-life.
Description
Technical field
What the present invention relates to is a kind of air valve bridge, is a kind of fuel engine part.
Background technique
At the initial stage of engine technology development, generally all adopt dual valve technology (singly advancing single), in this stage, the open and close of valve is generally all directly controlled by rocking arm (connecting rod), and each rocking arm (connecting rod) can only be controlled a valve.Along with development of science and technology, the lasting progress of engine technology, and environmental protection requirement have produced many Valves Technology (advancing many rows) more.The appearance of many Valves Technology, structurally require rocking arm can control two (or a plurality of) valves of the same name simultaneously, at this moment air valve bridge has just appearred, air valve bridge is a kind of part that two (or a plurality of) valve stems of the same name are coupled together and are connected with rocking arm, and rocking arm is operated two or more valves by means of air valve bridge.Air valve bridge is before linked up two or more valve stems of the same name as a bridge, structurally also as bridge valve stem is rested on each valve stem as bridge pier.Air valve bridge is connected with rocking arm with the bridge top, and rocking arm is acted on the air valve bridge, and air valve bridge remakes and is used on the valve stem.Valve stem is generally cylindrical body, for limiting the position between valve stem and the air valve bridge, at air valve bridge and the contacted position of valve stem the cylindrical cavity of making Spielpassung with valve stem is arranged, and the cylindrical cavity top is contacted of air valve bridge and a valve stem.The surface of contact S of air valve bridge and valve stem is the plane for a long time, as shown in Figure 1.Because the action that needs accurately to transmit rocking arm is to valve stem, on the air valve bridge with valve stem on the parallelism of contacted two faces require very high.Therefore, in order to ensure the required precision of motor, the designer often has to propose very high technical requirements when the design air valve bridge, comprises the requirement to air valve bridge shape and position dimension tolerance.Usually, air valve bridge this parallelism EE Error Excepted of when design only is 0.03 to 0.05mm.This just extends a series of problems, at first, in order to meet design requirement, must use high-precision processing and detection facility, waits as machining center and astrolabe and processes and detect part, causes manufacture cost to improve greatly; The second, although the designer has proposed very high required precision, the part after the processing has also satisfied these requirements, and still there is foozle in part itself, is presented as the parallelism error e of two contact planes after mechanism's assembling, as shown in Figure 2.Described error makes each valve stem unbalance stress the in service of mechanism, and force bearing point is away from the valve stem axis, and makes this line of action of force and valve stem axis not parallel.Analyze the valve stem stressing conditions: in theory, should F1=among the figure
1/
2F (F1=then when connecting three valve stems
1/
3F, the suffered power of each valve stem should be F1=when connecting n valve stem
1/
nF), and F1=f1, radial component does not promptly have.And in fact, owing to error e exists all the time, so F1 ≠
1/
2F, F1=f1+f2, wherein: F is that rocking arm acts on the power on the air valve bridge, and F1 is that air valve bridge acts on the power on the single valve stem, and f1 is the axial thrust load of F1, and f2 is the radial component of F1.Promptly in mechanism's running, there is radial component in the power that 1 pair of valve stem 2 of air valve bridge is executed, and this radial component will cause the wearing and tearing aggravation of valve guide bushing or valve stem, cause mechanism's life-span to reduce, might cause mechanism's early failue when serious, cause user cost to improve greatly.
Summary of the invention
At above-mentioned defective, the present invention proposes a kind of air valve bridge and valve stem and be not the plane to plane contact, manufacture cost and the low air valve bridge of user cost.
Air valve bridge provided by the invention, just like the structure of bridge shape,, there are being downward and valve stem to make the cylindrical cavity of Spielpassung with the valve stem position contacting promptly just like a cross bar of the body of a bridge, the cavity upper base is the face that contacts with valve stem, the spherical crown that is shaped as downward protrusion of cavity upper base.
Air valve bridge provided by the invention, the spherical crown of the downward protrusion that contacts with valve stem on the said air valve bridge, its arch end circular diameter is between valve stem diameter and column cavity cross section minimum width, and sagitta is 0.1 to 0.3mm.
Air valve bridge provided by the invention, air valve bridge and valve stem are not plane and plane contact, but sphere and plane contact.Air valve bridge just provided by the invention will be designed to the spherical crown shape with the valve stem contact segment on the air valve bridge, and the surface of contact between air valve bridge and the valve stem is sphere and plane, makes both form a contact.Like this, no matter how the machining accuracy of air valve bridge or the assembly precision of mechanism change, as long as in the scope of spherical crown sagitta and valve stem and the permission of air valve bridge matching gap, can both guarantee that each valve stem is stressed evenly, guarantee that valve stem is by accurate orbiting motion, meet design requirement, prolong mechanism's life-span.Because unnecessary have a very high processing technique requirement, can significantly reduce manufacture cost from process equipment and machining period aspect, the growth in working life has then reduced user cost, meets modern manufacturing philosophies such as lean manufacturing, energy-saving and environmental protection.
Description of drawings
Fig. 1, prior art air valve bridge structural representation, S air valve bridge and valve stem are contacted among the figure;
Fig. 2, prior art valve stem force analysis figure are among the figure: 1-air valve bridge, 2-valve stem, the foozle of e-air valve bridge and valve stem surface of contact, the F-rocking arm acts on the power on the air valve bridge, and the F1-air valve bridge acts on the power on the single valve stem, the axial thrust load of f1-F1, the radial component of f2-F1;
The air valve bridge structural representation of Fig. 3, one embodiment of the invention, among the figure: R is the Qiao Ding plane, SR is the sphere that air valve bridge contacts with valve stem;
The structural representation of Fig. 4, one embodiment of the invention air valve bridge and valve stem, among the figure: 2-valve stem, 3-air valve bridge, the parallelism error of e '-air valve bridge and valve stem surface of contact, the F-rocking arm acts on the power on the air valve bridge, and the f-air valve bridge acts on the power on the valve stem.
Embodiment
Be the structure that is connected with two valve stems for air valve bridge embodiment, but air valve bridge provided by the invention is not limited in the cited structural type of these embodiments, also can be the air valve bridge that connects valve stem of the same name more than three or three.The structure of the air valve bridge of two valve stems of connection provided by the invention as shown in Figure 3, the cross bar that slightly is arc is arranged, cross bar top intermediate section R is that bridge top is a horizontal plane with the rocking arm junction surface, and both sides, cross bar top section is downward domatic in inclined-plane, and cross bar bottom is a horizontal plane.The following both ends horizontal face of cross bar place has an opening cylindrical cavity and an elliptical cylinder-shape cavity vertically downward respectively, and its body diameter is made Spielpassung with the cylindroid minor axis with the diameter of the valve stem that will be connected.The top of cylindrical cavity is a spherical crown, and promptly the surface of contact of itself and valve stem is a sphere that protrudes downwards.
The physical dimension of the spherical crown that air valve bridge contacts with valve stem depends on the size of engine power and the design size of valve stem, and engine power is big more, and the radius of a ball of spherical crown is also big more, and the sagitta of spherical crown is relative also more little.In general, the spherical crown sagitta gets 0.1 to 0.3mm, and when diameter one timing of valve stem, circle radius is also certain at the bottom of the arch of spherical crown.
The nominal diameter of example 1, valve stem is 6mm, gets the sagitta 0.3mm of spherical crown, and the minimum clearance that valve stem cooperates with air valve bridge is 0.11mm, and circle radius is 15.65mm at the bottom of the arch of spherical crown.At this moment, air valve bridge tiltable angle is 1 degree 3 minutes and 1 second, is reference level with the air valve bridge end face after the installation promptly, and the parallelism error permitted value (calling the parallelism total error in the following text) of the common face of each valve stem end face is 1.02mm.
The nominal diameter of example 2, valve stem is 10mm, gets the sagitta 0.25mm of spherical crown, and the minimum clearance that valve stem cooperates with air valve bridge is 0.11mm, and circle radius is 51.53mm at the bottom of the arch of spherical crown.At this moment, air valve bridge tiltable angle is 36 minutes and 1 second, and promptly the parallelism total error is 0.45mm.
The nominal diameter of example 3, valve stem is 14mm, gets the sagitta 0.2mm of spherical crown, and the minimum clearance that valve stem cooperates with air valve bridge is 0.11mm, and circle radius is 124.36mm at the bottom of the arch of spherical crown.At this moment, air valve bridge tiltable angle is 29 minutes and 5 seconds, and promptly the parallelism total error is 0.43mm.
In sum, as shown in Figure 4, air valve bridge provided by the invention, point just on the surface of contact of itself and valve stem, the suffered power F of air valve bridge can balancedly be assigned to each valve stem, i.e. F=2f (when connecting three valve stems then F=3f, F=nf when connecting n valve stem), and this point is nearer apart from the valve stem axis, and power f that valve stem is suffered and valve stem parallel axes are also in full accord with the moving direction of valve stem.Therefore, both made between air valve bridge 3 and valve stem 2 surface of contact, to have parallelism error e (parallelism error on the air valve bridge between the bottom surface of sphere and the valve stem end face), and can guarantee that still valve stem pressed desirable orbiting motion.
Claims (2)
1. air valve bridge, just like the structure of bridge shape,, there are being downward and valve stem to make the cylindrical cavity of Spielpassung with the valve stem position contacting promptly just like a cross bar of the body of a bridge, the cavity upper base is the face that contacts with valve stem, it is characterized in that the spherical crown that is shaped as downward protrusion of cavity upper base.
2. air valve bridge as claimed in claim 1 is characterized in that the spherical crown of the downward protrusion that contacts with valve stem on the said air valve bridge, and its arch end circular diameter is between valve stem diameter and column cavity cross section minimum width, and sagitta is 0.1 to 0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100672314A CN101240721A (en) | 2007-02-06 | 2007-02-06 | Air valve bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100672314A CN101240721A (en) | 2007-02-06 | 2007-02-06 | Air valve bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101240721A true CN101240721A (en) | 2008-08-13 |
Family
ID=39932503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100672314A Pending CN101240721A (en) | 2007-02-06 | 2007-02-06 | Air valve bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101240721A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207012A (en) * | 2010-03-30 | 2011-10-05 | 格努迪有限公司 | Valve bridge |
| CN103216285A (en) * | 2013-04-09 | 2013-07-24 | 安徽江淮汽车股份有限公司 | Air door bridge and top camshaft engine |
| CN104712385A (en) * | 2015-03-27 | 2015-06-17 | 安徽江淮汽车股份有限公司 | Engine valve bridge structure |
| CN104791036A (en) * | 2015-03-27 | 2015-07-22 | 安徽江淮汽车股份有限公司 | Engine air distribution mechanism |
| CN107100693A (en) * | 2012-06-29 | 2017-08-29 | 伊顿(意大利)有限公司 | Valve axle assemble and valve actuating mechanism assembly |
| CN107503815A (en) * | 2017-09-21 | 2017-12-22 | 潍柴动力股份有限公司 | A kind of air valve bridge, valve actuating mechanism and engine |
| CN109944655A (en) * | 2019-05-06 | 2019-06-28 | 浙江黎明智造股份有限公司 | A kind of rotatable valve Biodge device |
| CN112475799A (en) * | 2020-11-16 | 2021-03-12 | 艾肯（江苏）工业技术有限公司 | Method for processing cross arm of valve of internal combustion engine |
-
2007
- 2007-02-06 CN CNA2007100672314A patent/CN101240721A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207012A (en) * | 2010-03-30 | 2011-10-05 | 格努迪有限公司 | Valve bridge |
| CN107100693A (en) * | 2012-06-29 | 2017-08-29 | 伊顿(意大利)有限公司 | Valve axle assemble and valve actuating mechanism assembly |
| CN103216285A (en) * | 2013-04-09 | 2013-07-24 | 安徽江淮汽车股份有限公司 | Air door bridge and top camshaft engine |
| CN103216285B (en) * | 2013-04-09 | 2015-05-06 | 安徽江淮汽车股份有限公司 | Air door bridge and top camshaft engine |
| CN104712385B (en) * | 2015-03-27 | 2017-04-12 | 安徽江淮汽车集团股份有限公司 | Engine valve bridge structure |
| CN104791036B (en) * | 2015-03-27 | 2017-04-05 | 安徽江淮汽车集团股份有限公司 | A kind of engine valve actuating mechanism |
| CN104791036A (en) * | 2015-03-27 | 2015-07-22 | 安徽江淮汽车股份有限公司 | Engine air distribution mechanism |
| CN104712385A (en) * | 2015-03-27 | 2015-06-17 | 安徽江淮汽车股份有限公司 | Engine valve bridge structure |
| CN107503815A (en) * | 2017-09-21 | 2017-12-22 | 潍柴动力股份有限公司 | A kind of air valve bridge, valve actuating mechanism and engine |
| CN107503815B (en) * | 2017-09-21 | 2020-08-21 | 潍柴动力股份有限公司 | Valve bridge, valve driving mechanism and engine |
| CN109944655A (en) * | 2019-05-06 | 2019-06-28 | 浙江黎明智造股份有限公司 | A kind of rotatable valve Biodge device |
| CN112475799A (en) * | 2020-11-16 | 2021-03-12 | 艾肯（江苏）工业技术有限公司 | Method for processing cross arm of valve of internal combustion engine |
| CN112475799B (en) * | 2020-11-16 | 2022-07-26 | 艾肯（江苏）工业技术有限公司 | Method for processing cross arm of valve of internal combustion engine |
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Open date: 20080813 |